Development And Evaluation Of A Dispersive Liquid Environmental Sciences Essay

It has been developed a small-scale, simple, and rapid diffusing liquid-liquid microextraction ( DLLME ) process in combination with fiber optic-linear array sensing spectrophotometry ( FO-LADS ) with charge-coupled device ( CCD ) sensor profiting from a micro-cell. The official mention methods ( ASTM D2330 – 02, ISO 7875-1 ) which require boring processs were replaced with modified method, as a consequence, it has achieved a major decrease in sample size, riddance of the usage of expensive glasswork, and a lessening in the measure of trichloromethane used every bit good as much more addition in sensitiveness. Our presented method requires merely one twentieth of sample ( 5.0 milliliter ) , less than one three-hundredth of microextraction dissolver ( chloroform = 138 A µL ) , and much reduced in analytical clip compared with official analytical methods ( less than one minute ) . The standardization curve was additive in the scope of 0.06 A- 10-1 – 0.8 A- 10-1 milligra m La?’1 of Na dodecyl sulphate ( SDS ) with a correlativity coefficient ( R ) of better than 0.99 and the LOD was 0.02 A- 10-1 milligram La?’1. The repeatability of the proposed method ( n=7 ) were found to be 4.5 and 3.6 % for the concentration of 0.03 and 0.07 milligram La?’1, severally. The enrichment factor was found to be 75 for SDS. Keywords: Diffusing liquid-liquid microextraction A · Water analysis A · Methylene blue active substance A · Anionic wetting agent A · Fiber optic-linear array sensing spectrophotometry1. IntroductionA turning public concern over protecting our environment obligate chemists, including analytical chemists, to alter their activities in such a manner that they will be conducted in an environmentally friendly mode. Sampling, and particularly sample readying, often involves coevals of big sums of pollutants. This is why sample readying techniques that use a little sum of organic dissolver, or none at all, have been developed [ 1-4 ] . Anionic wetting agents ( AS ) are widely used in family cleaners, industrial detergents and decorative preparations. The wetting agents expelled to natural H2O reservoirs as municipal and industrial wastes are good known to hold inauspicious effects on aquatic beings ; hence the monitoring of wetting agents in environmental samples is of great importance [ 5, 6 ] . For the measuring of entire surfactant concentration, titration methods have been extensively explored [ 7, 8 ] . Several ion-selective electrodes sensitive to anionic wetting agents have been reported so far [ 9-11 ] . Anionic wetting agents are normally determined by spectrophotometric methods utilizing methylene blue ( MB ) , this standard methods being used to find AS in the surface and tap-water samples ( ASTM D2330 – 02, ISO 7875-1 ) [ 12, 13 ] . The method is based on the formation of blue-coloured trichloromethane extractible ion-pair between the AS and the cationic MB. This requires three consecutive extractions of AS-MB content in 100 milliliter of sample with 15, 10, and 10 milliliter of trichloromethane. The ion-pair is determined by spectrophotometry, mensurating the optical density at 650 nanometer. However, these official methods are non merely long and boring but besides require great measures of sample and trichloromethane which has harmful consequence on chemists and environment. Besides, this method needs batch of research lab glasswork, do these operations highly expensive and uncomfortable for the operator. So it seems necessary to seek for new offers as options for the a foresaid method in order to increase the laboratory productiveness, operator safety, comfort, and to cut down drastically the reagents ingestion and waste production. Koga et Al. proposed a decrease of the size of sample employed for AS finding in H2O, being modified this method to utilize 50 milliliter of H2O and 5 milliliter trichloromethane, holding obtained a six times addition of the research lab productiveness [ 14 ] . An other simplified methods that cut down the measures of reagent by utilizing a certain sort of adsorbent have been proposed [ 15 ] . However, this method besides involves boring processs. Besides other research workers studied primary biodegradation of AS in aerophilic showing trials based on the formation of ion-pair of AS and MB [ 16 ] . By early 2006, Assadi and his research group innovated an attractive, high public presentation and powerful liquid-phase microextraction ( LPME ) method which named their techniques â€Å" Diffusing liquid-liquid microextraction † ( DLLME ) [ 17-19 ] . Beyond the trait of simpleness of operation and celerity, ingestion of microextraction dissolver at the micro-level volume and compatibility with analytical instruments are other profitable characteristics of DLLME as a sample pretreatment method [ 20-25 ] For extremely sensitive, accurate, rapid, and cheap measuring with ingestion of extraction dissolver at micro-level volume, we propose a simplification of the spectrophotometric MB method that can be utile for finding anionic wetting agents in aqueous samples. A consecutive DLLME in combination with fiber optic-linear array sensing spectrophotometry ( FO-LADS ) with charge-coupled device ( CCD ) sensor profiting from a micro-cell was used for this intent.2. Experimental2.1 Reagent and criterions The reagents used in the experiments were of analytical class: MB ( used as a cationic dye ) , sodium dodecyl sulphate ( SDS, employed as a representative anionic wetting agent ) , acetone as disperser dissolvers, trichloromethane as microextraction dissolver, NaOH, HNO3 ( 65 % ) , HCl ( 37 % ) , acetic acid, and Na ethanoate for doing buffer solution ) and obtained from Merck ( Darmstadt, Germany ) . Absolute ethyl alcohol ( & gt ; 99.6 % ) purchased from Bidestan company ( Qazvin, Iran ) . The needed measure of SDS was dissolved in pure H2O to do standard solution of 1000 mg L-1. The stock solutions of MB ( 3 A- 10-3 mol L-1 ) were prepared by fade outing appropriate sums in dual distilled H2O. All the plastic and glasswork were cleaned by soaking for 24 H in 10 % v/v HNO3. After cleansing, all containers were exhaustively rinsed three times with dual distilled H2O and twice with acetone prior to utilize. No any detergent was used to clean glasswork because it is hard to take from surfaces and causes high consequences. 2.2. Apparatus and Instrumentation apparatus The fiber optic-linear array sensing spectrophotometer was perched from Avantes ( Eerbeek, Netherlands ) . The light beam from the UV-Vis beginning ( Deuterium-Halogen ) was focused to the sample micro-cell ( Starna Scientific, Essex, England, Cat. NO. 16.40F-Q-10/Z15 ) . The spectrograph accepts the light beam transmitted through the optical fibre and disperses it via a fixed grate across the 2048 component CCD-linear array sensor. The instrumental parametric quantities are listed in Table 1. A Universal EBA 20 extractor equipped with an angle rotor ( Angle rotor for 8 A- 15 milliliter tubings, 6000 revolutions per minute, Cat. No. 2002 ) were obtained from Hettich ( Kirchlengern, Germany ) . An adjustable pipette ( 10-100 A µL ) was prepared from Brand ( Wertheim, Germany ) . All 0.1, 1.0 and 2.5 milliliter panpipes were prepared from Hamilton ( Reno, NV, USA ) . To clean out the micro-cell, avoid any memory consequence and better the repeatability of process, it was washed three times by about 2 milliliters of propanone between each analysis and dried with a watercourse of cold air by usage of a hair drier. 2.3. Mention process Hundred milliliter of sample was placed into a 250 milliliter dividing funnel and 10 milliliter of a 1 A- 10a?’3 mol L-1 MB solution and 15 milliliters trichloromethane were added. After agitating the mixture smartly for 1 min, the two stages were let to divide and chloroform bed taken for analysis. Each sample was extracted to boot two times utilizing 10 ml part of trichloromethane and optical density measurings were made at 650 nanometers in forepart of an external standardization prepared from SDS. Solutions in the scope between 0.1 and 0.5 milligrams La?’1 were extracted in the same manner than samples. 2.4 Recommended analytical process Into a series of screw cap glass trial tubing with conelike underside 5.0 milliliter of the standard SDS solutions at the concentration in the studied scope were pipetted out. Then 25 A µL of 3 A- 10-3 mol L-1 MB standard solution was added. Afterwards, 2.00 milliliter ethyl alcohol ( disperser dissolver ) incorporating 138 A µL trichloromethane ( microextraction dissolver ) was injected quickly into the sample solution utilizing a 2.50-mL syringe. This injection led to a cloudy solution, caused by the all right droplets of trichloromethane into the aqueous sample. The stage separation was accelerated by centrifugating at 5500 revolutions per minute for 3 min. After this measure the spread all right droplets of trichloromethane were settled at the underside of the aqueous solution in conelike trial tubing. Subsequent to this process, for evacuating the upper aqueous solution a long needle connected to 10-mL injection syringe was immersed down in to prove tubing and pulled the spe culator up till minute 200-300 A µL of aqueous stage remains at the top of organic bed. The volume of the settled organic stage was determined utilizing a 100-i? ­L microsyringe at 25  °C which was 65A ±2 A µL. Sixty micro-liter of this settled stage was removed by micropipette and introduced into micro-cell. The ordinary optical density of AS-MB ion-pair in trichloromethane was measured at the wavelength of 650.0 nanometers by agencies of FO-LADS.3. Result and treatmentIn order to obtain a high sensitiveness, the parametric quantities impacting the DLLME such as the type of the microextraction and the disperser dissolvers every bit good as their volume, concentration of MB, pH, and the microextraction clip were optimized. The enrichment factor ( EF ) was defined as the ratio of the analyte concentration in the settled stage to the initial analyte concentration in the aqueous sample. The analyte concentration in the settled stage was calculated from the standardization graph obtained by the conventional liquid-liquid extraction ( LLE ) /FO-LADS ( extraction conditions: 2.0 milliliters standard H2O sample in the concentration scope of 4.5 A- 10-4 – 1.5 A- 10-3 mol L-1 of MB and 1.5 – 5.0 mg L-1 SDS which extracted with 2.0 milliliters trichloromethane ) . 3.1. Chemical reaction of SDS and MB The equilibrium between SDS, MB and the distribution of SDS-MB ion-pair in H2O and trichloromethane has been qualitatively reported in the literature [ 14 ] . The AS dissolved in H2O are somewhat soluble in trichloromethane. On the other manus, MB dissolves good in both, trichloromethane and H2O, supplying a bluish colour solution in all the instances. When pure H2O is assorted with a chloroform solution of MB, the bluish colour is quickly transferred to the aqueous stage. 3.2. Consequence of ion-pair formation status parametric quantities The overall ion-pair formation status of SDS and MB is concentration of each, pH every bit good as clip needed. Our efforts were chiefly centered on optimising these parametric quantities under our microextraction conditions ( DLLME ) . In this survey the clip required for ion-pair formation were tested between 0 sec -10 min. The consequences, deducing from the ion-pair formation utilizing different reaction times, exhibited that the reaction clip has no any consequence on ion-pair formation efficiency and longer clip period did non better the reaction. In order to find the optimum pH for the ion-pair formation, several sample pH values were varied from 2.5 – 7.5 to prove the ion-pair formation of AS and MB in 5.0 mL H2O samples incorporating 0.04 mg L-1 SDS and extra sum of MB. The highest microextraction efficiency was achieved in the pH of studied scope and we found that in the alkalic solution MB it self would pull out into trichloromethane in absence of any MBAS. In optimisation processs no any buffer solution were used because after adding reagents the pH of solution become somewhat acidity in coveted scope. The influence of the MB concentration on the ion-pair formation/microextraction efficiency was performed in the scope of 0 – 2.1 A- 10-5 mol L-1 while the concentration of SDS was 0.04 mg L-1. During the fluctuation of this concentration the other experimental variables remained changeless. The consequences demonstrated that by increasing the MB concentration up to 1.5 A- 10-5 mol L-1 the microextraction efficiency increased and, so, no fluctuation were observed ( as depicted in Fig. 1 ) . Sing the fact that proposed method is additive up to 0.08 milligrams L-1, hence, the sum of 5 A- 10-5 mol L-1 MB was selected as consider adequate surplus sums. 3.3. Influence of the microextraction dissolver sort and volume The choices of an appropriate microextraction dissolver have a high importance function to acquire a high sensitiveness DLLME, so sort and volume of it were studied and optimized. Microextraction dissolver should hold particular features in DLLME ; it should hold really low solubility in H2O, extraction capableness of interested compounds, and much denseness than H2O. Chloroform and C tetrachloride are available as the most celebrated microextraction dissolvers in DLLME. During our primary surveies we found that C tetrachloride is non capable to pull out the ion-pair of SDS-MB at all. Furthermore, the recommended dissolver in the standard methods is trichloromethane ; hence, it was our extinguished pick. To look into the consequence of microextraction dissolver volume, experiments were performed by utilizing 2.00 mL ethyl alcohol incorporating different volumes of trichloromethane ( 138, 143, 148, 153, 158 and 163 i? ­L ) . By increasing the volume of trichloromethane from 138 to 163 A µL, the volume of the settled stage additions about from 65 to 90 A µL. Harmonizing to consequences ( Fig. 2 ) , optical density lessenings with increasing the volume of trichloromethane ; it is clear that by increasing the volume of trichloromethane the volume of the settled stage additions. Subsequently, at low volume of the microextraction dissolver high optical density or enrichment factor was obtained. 3.4. Influence of the disperser dissolver sort and volume In DLLME, choosing an appropriate disperser dissolver is of import, since disperser dissolver should be mixable with both microextraction dissolver and aqueous sample. For the interest of geting the most suited disperser dissolver, two sorts of instead safe disperser dissolvers: propanone and ethyl alcohol were studied. A series of sample solutions were studied by utilizing 2.00 milliliter of each disperser dissolver incorporating 138 A µL of trichloromethane and the enrichment factors were investigated. The consequences showed that ethyl alcohol showed much better efficiency than propanone ( enrichment factor of 75 and 17, severally ) . Less toxicity and the higher microextraction efficiency of ethyl alcohols make it a better pick. After taking ethanol as disperser dissolver, it is necessary to optimise the volume of it. The influence of the disperser dissolver ( ethanol ) volume on the microextraction efficiency was tested over the scope of 0.50 – 2.00 milliliter, but the fluctuation of the ethyl alcohol volume ( disperser dissolver ) caused alterations in the settled stage volume. Hence, it was impossible to see independently the influence of the ethyl alcohol volume on the microextraction efficiency in DLLME. To avoid this job and in order to achieve a changeless volume of the setteled stage, the ethyl alcohol and trichloromethane volumes were changed at the same time. The experimental conditions were fixed and included the usage of different ethanol volumes: 0.50, 1.00, 1.50, and 2.00 milliliter, incorporating 97, 102, 121, and 138 I?L of trichloromethane, severally. Under these conditions, the settled stage volume remained changeless ( 65 A ± 2 I?L ) . Fig. 3 shows the curves for optical density o f SDS-MB ion-pair versus the volume of ethyl alcohol. The optical density increased, when the ethanol volume increased from 0.50 to 2.00 milliliter of ethyl alcohol as disperser dissolver. Harmonizing to the consequences, a 2.00 milliliter ethyl alcohol was chosen as the optimal disperser dissolver volume. 3.5. Influence of the microextraction clip Microextraction clip ( interval clip between the injection of a mixture of disperser dissolver and microextraction dissolver, before get downing to centrifugate ) is of import factor that may be effects microextraction efficiency of analytes from aqueous stage to organic stage. The fluctuation for microextraction efficiency of SDS-MB as a map of microextraction clip was studied in the scope of 5 unsweet – 10 min. The ensuing informations, exposing that the microextraction clip has no important consequence on the microextraction efficiency for the mark compound. It was revealed that after the formation of the cloudy solution, the contact country between the microextraction dissolver and the aqueous stage was well big, defining why the extraction equilibrium could be established really fast. In this method the most time-consuming process was centrifugation of the sample solution in the microextraction process, which was about 3 min. Sing the fact this period of clip ( 3 min ) is for eight trial tubing ( microextraction vass ) , the clip required for managing one trial tubing is less than 25 seconds. 3.6. Analytic features of the method To measure the practical pertinence of the proposed DLLME/FO-LADS technique for finding of MBAS in H2O samples, several analytical public presentation features such as enrichment factor, one-dimensionality, bound of sensing ( LOD ) and repeatability were investigated under optimized conditions. The standardization curve was additive in the scope of 0.06 A- 10-1 – 0.8 A- 10-1 milligram La?’1 of SDS with a correlativity coefficient ( R ) of better than 0.99. The LOD, defined as CL =3 SB/m ( where CL, SB and m are the bound of sensing, standard divergence of the space and incline of the standardization graph, severally ) , was 0.02 A- 10-1 milligram La?’1. The repeatability of the proposed method expressed as comparative criterion divergences ( RSDs, n=7 ) were found to be 4.5 and 3.6 % for the concentration of 0.03 and 0.07 milligram La?’1, severally. The enrichment factor was found to be 75 for SDS. 3.7. Consequence of diverse ions and application to practical samples Any organic or inorganic compound that will organize a trichloromethane extractable ion-pair with MB will interfere by bring forthing high consequences. These positive intervention include organic sulfonates, carboxylates, phosphates, and phenols, every bit good as inorganic cyanates, chlorides, nitrates, and thiocyanates. On the other manus, any compound efficaciously viing with MB to organize an AS ion-pair will give negative consequences. These negative interventions cause by some aminoalkanes and have analytical significance in the instance of quaternate ammonium compounds. For pretreatment of MBAS in all Waterss and waste Waterss that contain meddlesome substances the undermentioned process is recommended by ASTM mention method. The selected sample is hydrolysed by boiling under partial reflux with hydrochloric acid. The residuary merchandises are neutralized to a controlled pH value, and reacted with 1-methylheptylamine. The resulting ion-pairs are extracted into a trichloromet hane stage and evaporated to dryness on a steam bath. The amine constituent of the ion-pair is removed by boiling in an aqueous alkaline media and the stray MBAS are so determined under the described mention process. Besides other research workers examined the consequence of assorted diverse ions on the finding of AS by similar method [ 14, 6 ] . In order to set up the cogency and pertinence of proposed method, it was applied to the finding of AS in several existent H2O samples ( mineral, pat, and good H2O samples ) by proposed method. For this intent, 5.0 milliliter of each sample was preconcentrated utilizing DLLME technique as described before ( pH was adjusted with acetic acid/sodium ethanoate buffer if necessary ) . In order to measure matrix consequence, the standard add-on method was applied for the finding of AS ( at spiking degrees of 0.02 and 0.05 mg L-1 ) in spiked existent samples which the comparative recoveries of analytes are mentioned in Table 2. The obtained consequences were compared with those obtained from spiked distilled H2O. In all instances, the spike recoveries confirm the dependability of the proposed method. The obtained comparative recoveries indicates that matrix does non act upon the microextraction efficiency in the mentioned samples ( no serious interventions ) , hence, there was non any duty t o take interventions. As it can be seen in table 3, the public presentation of proposed method shows distinguishable advantages over other methods with mention to try volume, extraction dissolver volume, RSDs, LODs and additive dynamic scopeDecisionsThis survey demonstrated that DLLME process with really pleasant and robust features for check of AS seems to offer possible campaigners for mention method, which utilizes really little sum of microextraction dissolver every bit good as its low cost. Furthermore, freshly DLLME process in combination with FO-LADS equipped with charge-coupled device ( CCD ) sensor profiting from a micro-cell demonstrated that LPME ( DLLME ) could be combine with spectrophotometer system despite of micro-level sample volume without any dilution and diminishing the sensitiveness. Analysis of several existent samples for AS content illustrated the truth, dependability, simpleness, dependability and bargain rate of method. It appears to be a time-saving techni que, chiefly for research labs executing analysis of a big figure of samples with a rapid coverage clip. Besides we suggest the pertinence of this method for supervising the biodegradation of AS.

Chemical Bond and Crystal Field Theory

TextBooks Sr No T-1 T-2 Title Engineering Chemistry Chemistry Reference Books Sr No R-1 Other Reading Sr No OR-1 OR-2 OR-3 OR-4 OR-5 OR-6 OR-7 Journals articles as Compulsary reading (specific articles, complete reference) http://onlinelibrary. wiley. com/journal/10. 1002/(ISSN)1097-4601 , http://www. springer. com/chemistry/electrochemistry/journal/10800 , http://www. sciencedirect. com/science/journal/13882481 , http://www. springerlink. com/content/100224/ , http://www. sciencedirect. com/science/journal/00108545 , http://pubs. acs. org/journal/joceah , http://www. ciencedirect. com/science/journal/00323861 , Title Author Edition 1st Year 2011 Publisher Name Cengage Learning Chemistry-Concepts and Applications Steven S. Zumdahl Author Suba Ramesh,S. Vairam , P. Kalyani Raymond Chang Edition 1st 9th Year 2011 2008 Publisher Name Wiley Tata McGraw Hill Relevant Websites Sr No RW-1 RW-2 RW-3 RW-4 RW-5 RW-6 (Web address) (only if relevant to the course) http://www. klte. hu/~lenteg/an imate. html http://dwb4. unl. edu/chemAnime/atomic_orbits. htm http://www. mhhe. com/physsci/chemistry/essentialchemistry/flash/hybrv18. wf Salient Features Chemistry animation and videos Atomic orbital animations Hybridization animation http://jchemed. chem. wisc. edu/JCEDLib/WebWare/collection/open/JCEWWOR019/mo Molecular orbital theory animations movies. html http://www. mhhe. com/physsci/chemistry/essentialchemistry/flash/activa2. swf http://dwb4. unl. edu/chemAnime/Electro. htm Activation energy animation Electrochemistry animations RW-7 RW-8 RW-9 http://www. mhhe. com/physsci/chemistry/essentialchemistry/flash/galvan5. swf http://dwb4. unl. edu/chemAnime/acid_base. htm http://wwwchem. uwimona. edu. jm:1104/courses/CFT. tml Galvanic Cell animation Acid base animations Crystal field theory Audio Visual Aids Sr No AV-1 AV-2 (AV aids) (only if relevant to the course) http://ocw. mit. edu/courses/chemistry/5-111-principles-of-chemical-science-fall2008/video-lectures/lecture-2/ Sali ent Features video on Introduction-Atom and molecule http://ocw. mit. edu/courses/chemistry/5-111-principles-of-chemical-science-fallVideo lecture-wave particle duality 2008/video-lectures/lecture-3/ http://ocw. mit. edu/courses/chemistry/5-111-principlesof-chemical-science-fall-2008/video-lectures/lecture-4/ http://ocw. it. edu/courses/chemistry/5-111-principles-of-chemical-science-fallAV on wavefunction and orbitals Mulitelectron atoms and electron 2008/video-lectures/lecture-5/ , http://ocw. mit. edu/courses/chemistry/5-111-principles- configurations of-chemical-science-fall-2008/video-lectures/lecture-6/ http://ocw. mit. edu/courses/chemistry/5-111-principles-of-chemical-science-fall2008/video-lectures/lecture-7/ http://ocw. mit. edu/courses/chemistry/5-111-principles-of-chemical-science-fall2008/video-lectures/lecture-8/ http://ocw. mit. du/courses/chemistry/5-111-principles-of-chemical-science-fall2008/video-lectures/lecture-10/ http://ocw. mit. edu/courses/chemistry/5-111-pri nciples-of-chemical-science-fall2008/video-lectures/lecture-12/ http://ocw. mit. edu/courses/chemistry/5-111-principles-of-chemical-science-fall2008/video-lectures/lecture-9/, http://ocw. mit. edu/courses/chemistry/5-111-principlesof-chemical-science-fall-2008/video-lectures/lecture-13/ http://ocw. mit. edu/courses/chemistry/5-111-principles-of-chemical-science-fall2008/video-lectures/lecture-15/ http://ocw. mit. du/courses/chemistry/5-111-principles-of-chemical-science-fall2008/video-lectures/lecture-14/ http://ocw. mit. edu/courses/chemistry/5-111-principles-of-chemical-science-fall2008/video-lectures/lecture-14/ http://ocw. mit. edu/courses/chemistry/5-111-principles-of-chemical-science-fall2008/video-lectures/lecture-31/ http://ocw. mit. edu/courses/chemistry/5-111-principles-of-chemical-science-fall2008/video-lectures/lecture-34/ http://ocw. mit. edu/courses/chemistry/5-111-principles-of-chemical-science-fall2008/video-lectures/lecture-35/ http://ocw. mit. du/courses/chemistry/ 5-111-principles-of-chemical-science-fall2008/video-lectures/lecture-26/ http://ocw. mit. edu/courses/chemistry/5-111-principles-of-chemical-science-fall2008/video-lectures/lecture-24 http://ocw. mit. edu/courses/chemistry/5-111-principles-of-chemical-science-fall2008/video-lectures/lecture-25/ AV on wavefunction and orbitals Mulitelectron atoms and electron configurations AV on wavefunction and orbitals Mulitelectron atoms and electron configurations Covalent and Ionic bond Covalent and ionic bond Electronegativity concept AV AV-3 AV-4 AV-5 AV-6 AV-7 AV-8AV-9 AV-10 AV-11 AV-12 AV-13 AV-14 AV-15 AV-16 AV-17 Hybridization and Shapes of molecules MO theory AV on MO of homonuclear diatomic molecules Av on rate law Av on transition state theory AV on catalysis AV on concept of redox reaction Balancing redox reaction Electrochemical cell AV-18 AV-19 AV-20 AV-21 AV-22 AV-23 AV-24 http://ocw. mit. edu/courses/chemistry/5-111-principles-of-chemical-science-fall2008/video-lectures/lecture-21 / http://ocw. mit. edu/courses/chemistry/5-111-principles-of-chemical-science-fall2008/video-lectures/lecture-22/ http://ocw. it. edu/courses/chemistry/5-111-principles-of-chemical-science-fall2008/video-lectures/lecture-23/ http://ocw. mit. edu/courses/chemistry/5-111-principles-of-chemical-science-fall2008/video-lectures/lecture-27/ http://ocw. mit. edu/courses/chemistry/5-111-principles-of-chemical-science-fall2008/video-lectures/lecture-28/ http://wwwchem. uwimona. edu. jm:1104/courses/CFT. html http://ocw. mit. edu/courses/chemistry/5-111-principles-of-chemical-science-fall2008/video-lectures/lecture-30/Classification of acid -base Autoionization of Water, pH Function, Strength of Acids and Bases,Equilibrium Involving Weak Acids and bases pH of salt solutions,buffers, Common ion effect, Acid-base titration. Introduction of coordination compounds, Nomenclature, Crystal Field Theory in octahedral complexes CFT Application of crystal field theory in magnetic properties and colour of the complex LTP week distribution: (LTP Weeks) Weeks before MTE Weeks After MTE Spill Over 7 6 2 Detailed Plan For LecturesWeek Number Lecture Number Broad Topic(Sub Topic) Chapters/Sections of Text/reference books Other Readings, Lecture Description Relevant Websites, Audio Visual Aids, software and Virtual Labs Introduction to syllabus and general discussion on chemical principles Discovery of electron and nucleus Introduction to syllabus and general discussion on chemical principles Discovery of electron and nucleus Learning Outcomes Pedagogical Tool Demonstration/ Case Study / Images / animation / ppt etc. Planned AV17 Week 1 Lecture 1 Atoms and Molecules(Importance T-1:Ch 1 Page 14-15 of chemical principles,Discovery and 25 section 1. of electron and nucleus,Waveand 1. 9 particle duality of light and matter) R-1:Ch 1 Page 25-27 Section 1. 5 Atoms and Molecules(Importance T-1:Ch 1 Page 14-15 of chemical principles,Discovery and 25 section 1. 6 of electron and nucleus,Waveand 1. 9 particle duality of light and matter) R-1:Ch 1 Page 25-27 Section 1. 5 Making them aware about the syllabus and its importance Lecture 2 Making them aware about the syllabus and its importance AV17 Week 1 Lecture 2 Atoms and Molecules(Schrodinger T-1:Ch 1 Page 14-15 equation,Quantum and 25 section 1. 6 numbers,Concept of wavefunction 1. and Ch 1 Page 32 and orbitals) -35 Section 1. 11 T-2:Ch 7 Page 279283 Section 7. 4and Ch 7 Page 286-287 Section 7. 6 Atoms and Molecules(Schrodinger T-1:Ch 1 Page 14-15 equation,Quantum and 25 section 1. 6 numbers,Concept of wavefunction 1. 9 and Ch 1 Page 32 and orbitals) -35 Section 1. 11 T-2:Ch 7 Page 279283 Section 7. 4and Ch 7 Page 286-287 Section 7. 6 Atoms and Molecules(Schrodinger T-1:Ch 1 Page 14-15 equation,Quantum and 25 section 1. 6 numbers,Concept of wavefunction 1. 9 and Ch 1 Page 32 and orbitals) -35 Section 1. 11 T-2:Ch 7 Page 279283 Section 7. 4and Ch 7 Page 286-287 Section 7. Atoms and Molecules (Mulitelectron atoms and electro n configurations) T-1:Ch 1 Page 27-31 35-40 Section 1. 10 1. 12-1. 13 De Broglie Equation, Limitation and numerical Schrodinger equation only and its Importance To explain particle and AV18 wave nature of matter and concept of wavefunctions ,orbitals Lecture 3 De Broglie Equation, Limitation and numerical Schrodinger equation only and its Importance To explain particle and AV18 wave nature of matter and concept of wavefunctions ,orbitals Week 2 Lecture 4 De Broglie Equation, Limitation and numerical Schrodinger equation only and its ImportanceTo explain particle and AV18 wave nature of matter and concept of wavefunctions ,orbitals spd orbitals shapes orientations including s p and d orbitals shapes orientations including nodes Electronic configuration of elements up to 30 atomic number using three building up principles Aufbaus rule Pauli Exclusion principle Hunds rule of maximum multiplicity Only electronegativity Pauling Concepts of Electronegativity To introduce the AV19 20 21 co ncept of orbital to define the arrangement of electrons at different energy level within an atomLecture 5 Atoms and Molecules(Electronegativity concepts,periodic properties) T-1:Ch A Page 87-91 Section A. 1 A. 2 T-2:Ch 7 Page 358375 To provide how does a AV24 covalent bond develop HW1 allotment ionic character Week 2 Lecture 5 Chemical Bonding(Covalent bonds, ionic bonds (Fajan's rule)) T-1:Ch A Page 87-88 Section A. 1 A. 2 and Ch 2 Page 49-54 Section 2. 1-2. 2 T-2:Ch 9 Page 366369 Section 9. 4 T-1:Ch A Page 87-88 Section A. 1 A. 2 and Ch 2 Page 49-54 Section 2. 1-2. 2 T-2:Ch 9 Page 366369 Section 9. 4 T-1:Ch A Page 87-91 Section A. 1 A. T-2:Ch 7 Page 358375 T-1:Ch 2 Page 58-64 T-2:Ch 10 Page 417429 T-1:Ch 2 Page 64-67 Section 2. 6 T-2:Ch 10 Page 429 -432 Section 10. 6 T-1:Ch 2 Page 67-70 Section 2. 6 T-2:Ch 10 Page 432437 Section 10. 7 RW-3 Lewis dot symbols Ionic bond Polar Non polar Covalent bonds and Comparision of the properties of covalent and ionic compounds, Fajans Rule Lewi s dot symbols Ionic bond Polar Non polar Covalent bonds and Comparision of the properties of covalent and ionic compounds, Fajans Rule Only electronegativity Pauling Concepts of ElectronegativityTo provide what type of AV22 23 bonding exist between various atoms to form a molecule Lecture 6 Chemical Bonding(Covalent bonds, ionic bonds (Fajan's rule)) To provide what type of AV22 23 bonding exist between various atoms to form a molecule Atoms and Molecules(Electronegativity concepts,periodic properties) To provide how does a AV24 covalent bond develop HW1 allotment ionic character Week 3 Lecture 7 Chemical Bonding(hybridization and shapes of molecules) sp sp2 and sp3 hybridization and their examples Concept BMO ABMO Bond Order Magnetic characterTo determine how do AV25 various atoms combine to form a molecule To define the existence AV26 stability and property magnetic character of molecule To define the existence AV27 stability and property magnetic character of molecule Lecture 8 C hemical Bonding(Molecular orbital theory) RW-4 Lecture 9 Chemical Bonding(molecular orbital diagram for homonuclear diatomic molecules) MO diagram Bond order and magnetic character of Homonuclear diatomic molecule only Week 4 Lecture 10Solid state(Idea of spatial T-1:Ch 3 Page 95-97 periodicity of lattices,band theory) Section 3. 1-3. 2 Amorphous and To define the nature of crystalline substance unit the substance formed cell Space Lattice due to arrangement of atoms or molecules Band theory Conduction To explain the electrical valence band Energy property of different Gap Application in substances Conductors Band theory Conduction To explain the electrical HW 1 submission valence band Energy property of different Gap Application in substances Semiconductor Types n nd p , Insulators Lecture 11 Solid state(Electrical properties of material like conductor) T-1:Ch B Page 142144 Section B. 3-B. 4 T-2:Ch 20 Page 876878 Section 20. 3 T-1:Ch B Page 145 Section B. 4 T-2:Ch 20 Page 876878 Se ction 20. 3 Lecture 12 Solid state(semiconductor and insulator) Week 5 Lecture 13 Chemical dynamics and Catalysis (Rate laws,nuclear chemistry and elementary reactions) T-1:Ch 6 Page 261268 Section 6. 1-6. 3 T-2:Ch 13 Page 546 – 564 567 Section 13. -13. 3 T-1:Ch 6 Page 287289 Section 6. 6 T-2:Ch 13 Page 568571 Section 13. 4 RW-5 Rate Order of reactions Units of Rate constant Rate law Integrated rate Law derivation amp numerical based on zero amp first Order reactions To have the understanding of reaction the stochiometry of reactants to form products AV28 Lecture 14 Chemical dynamics and Catalysis (Collision theory, Arrhenius concept,application of transition state theory (Energy profile diagram))Collision theory and To explain how do factors affecting it,No various reactions takes Derivation Arhenius place equation terms Activation energy Energy profile diagrams including intermediate and transition state reaction mechanism and To explain the sequence AV29 its evidence of st eps in a reaction and verification of proposed mechanism Lecture 15 Chemical dynamics and Catalysis (Reaction mechanism) T-1:Ch 6 Page 281286 289 Section 6. 56. 6 T-2:Ch 13 Page 571581 Section 13. 4 and13. 5 T-1:Ch 13 Page 581 and 586-588. Section 13. 6 T-2:Ch 14 Page737738 Week 6 Lecture 16 Chemical dynamics and Catalysis (Enzyme catalysis) nzyme catalysis, Protein To explain the increase AV30 chain peptidase in rate of reaction due Test 1 Allotment to substance without being consumed itself during the course of reaction taking enzyme catalysis Homework,Test 1 RW-6 Reduction amp oxidation To provide basics of Oxidizing and reducing electrochemistry To agents Oxidation number provide basics of electron transfer Balancing redox reaction reactions by ion electron method Galvanic cell Anode cathode Salt bridge and its significance Standard reduction potential and SHE Application of series Analytical numerical To explain how a chemical reaction is used to generate electricity and to pro vide possible combination of reactants in order to generate electricity AV31 32 Lecture 17 Lecture 18 Electrochemistry(Concept of Redox reaction,Balancing redox reaction) T-1:Ch 8 Page 330332 Section 8. 2-8. 3 T-2:Ch 19 Page 820 822 Section 19. 1 Week 7 Lecture 19 Electrochemistry(Electrochemical T-1:Ch 8 Page 332cell,Application of electrochemical 335 Section 8. 4 Ch 8 series) Page 335-342 345 347-352 Section 8. 58. 6 8. 8 T-2:Ch 19 Page 823 825 Section 19. Ch 19 Page 827 – 830 Section 19. 3 RW-7 Av33 Week 7 Lecture 20 Electrochemistry(Electrochemical T-1:Ch 8 Page 332cell,Application of electrochemical 335 Section 8. 4 Ch 8 series) Page 335-342 345 347-352 Section 8. 58. 6 8. 8 T-2:Ch 19 Page 823 825 Section 19. 2 Ch 19 Page 827 – 830 Section 19. 3 Electrochemistry(Nernst equation, corrosion) T-1:Ch 8 Page 335342 345 347-352 Section 8. 5-8. 6 8. 8 Ch 19 Page 853-854 868 Section 19. 119. 7 T-2:Ch 19 Page 827 830 Section 19. 3 Page 844 – 848 Section 19. 7 T-1:Ch 8 Page 335342 345 347-352 Section 8. 5-8. 6 8. 8 Ch 19 Page 853-854 868 Section 19. 119. 7 T-2:Ch 19 Page 827 830 Section 19. 3 Page 844 – 848 Section 19. 7 RW-7Galvanic cell Anode cathode Salt bridge and its significance Standard reduction potential and SHE Application of series Analytical numerical To explain how a chemical reaction is used to generate electricity and to provide possible combination of reactants in order to generate electricity Av33 Nernst equation numerical General Type Dry and wet Rusting of iron Corrosion prevention including cathodic protection Nernst equation and To explain deterioration of metals and its prevention Lecture 21 Electrochemistry(Nernst equation, corrosion) Nernst equation numerical General Type Dry and wet Rusting of iron Corrosion prevention including cathodic protection Nernst equation and To explain deterioration of metals and its prevention MID-TERMWeek 8 Lecture 22 Acid and bases(Classification of acid-bases, auto ionization of wat er, pH function, strength of acids and bases) T-2:Ch 15 Page 646 – 652 Section 15. 1 15. 2 15. 3 15. 4 RW-8 Different Concepts Arrhenius Bronsted Lowry and Lewis Autoionization of Water pH and Its measurement Strength of Acids and Bases Different Concepts Arrhenius Bronsted Lowry and Lewis Autoionization of Water pH and Its measurement Strength of Acids and Bases Equilibrium Involving Weak Acids and base To explain Different Concepts of Acid and bases pH AV 34 35 Lecture 23 Acid and bases(Classification of acid-bases, auto ionization of water, pH function, strength of acids and bases)T-2:Ch 15 Page 646 – 652 Section 15. 1 15. 2 15. 3 15. 4 RW-8 To explain Different Concepts of Acid and bases pH AV 34 35 Lecture 24 Acid and bases(Equilibrium T-2:Ch 15 Page 647– involving weak acids. equilibrium 663 Section15. 5 15. 6 involving weak bases) Acid base equilibria understanding AV 35 Week 9 Lecture 25 Acid and bases(Equilibrium T-2:Ch 15 Page 647– involving wea k acids. equilibrium 663 Section15. 5 15. 6 involving weak bases) Acid and bases(pH of salt solutions,buffers) T-2:Ch 15 Page 674 – 679 Section 15. 10 Ch 16 Page 698 – 716 Section 16. 216. 4 R-1:Ch 6Page259266 T-2:Ch 15 Page 674 – 679 Section 15. 10 Ch 16 Page 698 – 716 Section 16. 216. R-1:Ch 6Page259266 T-2:Ch 16 Page 698 – 716 Section 16. 216. 4 R-1:Ch 7 Page286314 T-1:Ch 4 Page 165170 Section 4. 5-4. 6 Equilibrium Involving Weak Acids and base pH of salt solutions and buffers Acid base equilibria understanding buffer and salt pH determination AV 35 Lecture 26 AV36 Lecture 27 Acid and bases(pH of salt solutions,buffers) pH of salt solutions and buffers buffer and salt pH determination AV36 Acid and bases(Common ion effect,acid-base titration) Common ion effect and Understanding pH acid base titration curves metric titration ex strong base vs weak acid AV36 Week 10 Lecture 28 Transition Metal Chemistry (Introduction and nomenclature of coordinati on compounds)Coordination compounds To explain the basics of AV 37 Ligands Donor atoms metalcomplexes coordination sphere Chelates oxidation state of central metal coordination number Nomenclature examples RW-9 Concept Splitting Energy Factors effecting Splitting Nature of ligands including Spectrochemical series oxidation state of metal and size of d orbitals CFSE in Tetrahedral complexes Splitting in square planar Comparision between Splitting energy of Octahedral and Tetrahedral complexes Effect of geometry on crystal field splitting To define the existence AV 38 39 and stability of different octahedral tetrahedral and square planar complexes of metals Lecture 29 Transition Metal Chemistry (Crystal Field Theory) T-1:Ch 4 Page 155160 Section 4. 2 Week 10 Lecture 30 Transition Metal Chemistry (Crystal Field Theory) T-1:Ch 4 Page 155160 Section 4. 2 RW-9Concept Splitting Energy Factors effecting Splitting Nature of ligands including Spectrochemical series oxidation state of metal an d size of d orbitals CFSE in Tetrahedral complexes Splitting in square planar Comparision between Splitting energy of Octahedral and Tetrahedral complexes Effect of geometry on crystal field splitting Application of crystal field theory in magnetic properties and colour of the complex Application of crystal field theory in magnetic properties and colour of the complex To define the existence AV 38 39 and stability of different octahedral tetrahedral and square planar complexes of metals Week 11 Lecture 31 Transition Metal Chemistry T-1:Ch 4 Page 163(Application of crystal field theory 164 Section 4. 4 in magnetic properties) T-2:Ch 22 Page 950955 Section 22. Transition Metal Chemistry(Colour T-1:Ch 4 Page 163of the complexes) 164 Section 4. 4 T-2:Ch 22 Page 950955 Section 22. 5 To explain the Av 40 properties magnetic character and colour of metal complexes To explain the AV 40 properties magnetic character and colour of metal complexes Lecture 32 Organometallics(Introductory theory of organometallics and its application) T-1:Ch C Page 187192 Section C. 1 Introduction Example of To explain the basics of Grignard reagent metalcarbon complexes ZeiglerNatta catalyst Application In polymerization with reaction hemoglobin and chlorophyll molecule use of metal in biological system Organometallics(Metals in biology) Lecture 33 Polymerization(Classification of polymers)R-1:Ch 18 page 941945 T-1:Ch 14 Page 601605 Section 14. 114. 2 Terms Monomer To explain different Oligomers Polymers types of polymers polymerization Degree of polymerization Functionality Clasification on the basis of structure types of monomer units Including Types of Copolymers occurance method of synthesis stereochemistry and thermal behavior Uses Addition Condensation and Copolymerisation with examples To provide various Test 2 allotment methods of synthesis of polymers Week 12 Lecture 34 Polymerization(Type of polymerisation) T-1:Ch 14 Page 606607 Section 14. 3 Week 12 Lecture 35 Polymerization(Ap plication of polymers) T-1:Ch 14 Page 601605 634-638 648-649 653-655 Section 14. 1-14. 14. 5-14. 6 Application of polymers To provide uses of polymers Lecture 36 Week 13 Lecture 37 Photochemistry(Jablonskii diagram) Photochemistry(Concept of fluorescence) T-1:Ch 22 Page 984986 Section 22. 3 T-1:Ch 22 Page 983989 Section 22. Homework,Test 2 Jablonskii diagram Singlet triplet To explain different possibilities on absorption of radiation Lecture 38 Concept of fluorescence To provide influence of rdiation on behavior of matter phosphorescence Quantum Yield Application of photochemistry in Photovoltaic solar cell To provide influence of rdiation on behavior of matter To use the principle of photochemistry in Photovoltaic solar cellPhotochemistry(Phosphorescence) T-1:Ch 22 Page 987989 Section 22. 5 Lecture 39 Photochemistry(Application of photochemistry in photo voltaic cell /solar cell) T-1:Ch 22 Page 989991 Section 22. 6 SPILL OVER Week 14 Lecture 40 Lecture 41 Revision Revision revisio n of syllabi upto MTE revision of syllabi after MTE Scheme for CA: Component Homework,Test Frequency 2 Total :Out Of 3 Each Marks Total Marks 10 10 20 20 Details of Academic Task(s) AT No. Objective Topic of the Academic Task Nature of Academic Task (group/individuals/field work Evaluation Mode Allottment / submission Week 2/4 Homework 1 To analyze comprehensive and analytical skills of studentsWave-particle duality of light and matter, Schrodinger equation, Individual Quantum numbers, Concept of wavefunction and orbitals, Mulitelectron atoms and electron configurations, covalent bonds, ionic bonds (Fajan’s rule) and electro-negativity concepts, hybridization and shapes of molecules, Molecular orbital theory, molecular orbital diagram for homonuclear diatomic molecule. performance based Homework,Test 1 To analyze the conceptual and analytical skills of students Wave-particle duality of light and matter, SchrA? AÂ ¶dinger Individual equation, Quantum numbers, Concept of wavef unction and orbitals, Mulitelectron atoms and electron configurations, covalent bonds, ionic bonds (Fajan's rule) and electro-negativity concepts, hybridization and shapes of molecules, Molecular orbital theory, molecular orbital diagram for homonuclear diatomic molecule.Concept of crystalinity and type of lattices, Band theory and its application in electrical properties of material like conductor, semiconductor and insulator Rate laws,Nuclear chemistry and elementary reaction, Collision theory, Arhenius concept, Application of Transition state theory (Energy profile diagram), Reaction mechanism . Concept of Redox reaction, Balancing redox reaction Individual Electrochemical cell, Nernst equation, Application of electrochemical series, Corrosion, Classification of Acid-Bases, Autoionization of Water, pH Function, Strength of Acids and Bases, Equilibrium Involving Weak Acids. Equilibrium involving weak bases, pH of salt solutions, and buffers,Common ion effect,Acid-base titration, I ntroduction of coordination compounds, Nomenclature, Crystal Field Theory and its application. Classification of polymers. Performance based 6/6 Homework,Test 2To analyze the knowledge of students which they gained from this course. Performance based 11 / 11 Plan for Tutorial: (Please do not use these time slots for syllabus coverage) Tutorial No. Lecture Topic Type of pedagogical tool(s) planned (case analysis,problem solving test,role play,business game etc) Tutorial 1 Importance of chemical principles,Discovery of electron Problem solving and nucleus,Wave-particle duality of light and matter, Schrodinger equation, Quantum numbers Concept of wavefunction and orbitals, Mulitelectron atoms and electron configurations,electro-negativity concepts,Periodic properties Problem solving Tutorial 2 Tutorial 3

Jeep and Social Media Essay

In recent years, social media has become an incredibly important tool with which people communicate. Young and old people alike use Facebook, YouTube, Twitter, and blogs to relay messages and connect with one another. However, these platforms are no longer used by individuals solely. More and more companies have begun to use social media to reach out to current and future customers and to advertise themselves. It is not uncommon for company Facebook pages and Twitter feeds to have a large number of subscribers or followers nowadays. One company that uses social media quite effectively is Jeep. The company uses outlets like Facebook, MySpace, and YouTube to reach out to their customers and try to capture new ones. Jeep uses social media to target a different type of audience than most companies. Whereas many firms would be trying to capture new customers, Jeep is more devoted to engaging existing customers and connecting Jeep owners. In doing this, Jeep’s target audience consists mainly men and women who are of driving age. There are a few other qualifications though. One of the attractions of a Jeep is the ruggedness and outdoorsy image that it embodies. Therefore, the target audience that Jeep tries to reach through it’s social media usage would most likely include those that are interested in a number of outdoor activities. In addition, though the Jeeps are sold to customers of any age, it seems that most users of social media are in the younger generations. While this is currently beginning to change, it is reasonable to believe that Jeep’s social media is targeted more towards younger Jeep owners – most likely those customers whose age lies in the range of the early teens to the late thirties. As already mentioned, Jeep’s focus is not really to attract new customers but to provide existing owners with a number of different ways to connect with eachother and with the company itself. Establishing these connections is where the interactivity of Jeep’s social media platforms comes into play. The main parts of Jeep’s social media are the Jeep Facebook page, the Jeep MySpace page, the Jeep Twitter feed, the official Flickr group, the Jeep YouTube account, and an online community titled â€Å"Come Together†. All of these places are used as exchanges where Jeep owners and enthusiasts can interact with one another. These interactions consist of uploading and viewing photos and videos to the Flickr and YouTube accounts, commenting on interesting segments on the â€Å"Come Together† community site, or talking to each other on the Facebook and MySpace pages. While there are not many contests or downloads that Jeep tries to push on visitors to their sites, visitors are strongly encouraged to post photos and comments relating to their personal experiences with the company. I have personally worked in a company that makes and sells aftermarket Jeep accessories and have seen firsthand how proud and involved Jeep owners can be over their Jeeps. Therefore, it is not surprising that these sites and social media platforms are often very successful in getting viewers to post photos, videos, and comments about their Jeeps and any others they see on the sites. There is no real advertising for products taking place on these social media sites. Instead, the sites act merely as an exchange of ideas and opinions between customers and the company. However, this is an example of a very good product marketing strategy. When site visitors view pictures of other Jeep owners’ vehicles, they may often see products on the other vehicles that they like and become interested in purchasing. This will often lead to sales of Jeep accessories without any real advertising expenses incurred by the company. Reviews, photos, and videos from actual customers serve to enhance the products in other people’s minds and indirectly lead to visitors purchasing goods. Traditional advertising is also integrated in all of these social media sites. All of Jeep’s current regular television commercials are posted on both the YouTube and MySpace pages. Print ads can also be found on the MySpace page. However, while traditional advertising can be found in many places on Jeep’s social media sites, it is not the focus. Jeep uses these sites more to promote connectivity between the customers. It seems as though they want visitors to forget that all these sites are part of a corporate marketing strategy; instead they want to promote the idea that the sites are merely a way for owners to exchange photos and stories about their experiences with the Jeeps they have bought. The company is not trying to push new products down the customers’ throats but rather is interested in hearing about the likes and dislikes that the customers have. I believe that this dedication to engaging the customer is part of what makes Jeep owners so devoted to the company. Therefore, Jeep’s social media platform is very effective at doing what the company sets out to do.

Report Essay Example | Topics and Well Written Essays - 1500 words - 4

Report - Essay Example The four components are, Consumption, Investment, Government Purchases and Net exports. 2008 The period under consideration is the two last quarters in 2008 i.e. the third and fourth quarters. In the third quarter, the US GDP decreased by -3.7% , this decrease was informed by a ragged growth in the four areas, Consumption, Investment, Net exports, and Government expenditure. Consumption was down to -3.8%, investment went down to -16.5%, and government expenditure was the only positive component at 4.3%. In the fourth quarter GDP deteriorated further registering a contraction to -8.9%. This contraction was informed by a -5.1% contraction in consumption, -33.9% contractions in investment and a further decline of government expenditure to 1.6%. 2009 In 2009, though the GDP was still recording negative GDP, there was a slight improvement as growth went up to -5.3% compared to the -8.9% recorded in the last quarter of 2008. This slight growth in GDP was informed by a -1.6 growth in consum ption, a further decline to -43% in investment, and a slight increase in government expenditure from 1.6% to 1.8%. In the second quarter the GDP continued to improve from -5.3% the previous quarter to -0.3%. This marked improvement was as a result of -1.8% decline in consumption (compared to -1.6% the previous quarter), -27.1% increase in investment, and a marked improvement of government spending to 9.6%. In the third quarter, the GDP continued to grow, for the first time in four quarters it recorded a positive figure of 1.4%. This was informed by a 2.1% growth in consumption, a -1.7% improvement in investment, and a 3.7 rise in government spending/expenditure. In the last quarter of 2009, the GDP increased further to a marked rise of 4.0%. In this quarter, consumption remained the same, investment went up by 41.4%, and government spending went up by 1.1%. 2010 In the first quarter of 2010, the GDP failed to register continued growth from the figures recorded in the last quarter of 2009. Instead, it grew by 2.3% which was a 1.7% decline in growth. This was informed by a 2.5% growth in consumption, a 19.8% growth in investment and

A streetcar named desire Movie Review Example | Topics and Well Written Essays - 500 words

A streetcar named desire - Movie Review Example In fact, this led to stoppage of production for the older version that had been edited, since the film had been converted into two-television movie and an opera (McCarthy, 2011). There are efforts made by produces and movie studio aimed at making this film a blockbuster during the summer of 1949, thereby focused on Broadway production in month of December 1949 (McCarthy, 2011). Therefore, some of other cinematic changes made on the film were censorship approvals that led to the film becoming a failure and subject to artistic mockery. The other changes involved setting the first scene; for example in the original text, Blanche’s was nervously waiting for her to arrive, while in film her sister ventures down to bowling alley in order to find her sister (McCarthy, 2011). Therefore, these changes were a form of expanding the settings of the scene in a way that would increase viewers’ image regarding characters environment. Besides, this would also give the viewers glimpses in to characters lives, thereby avoiding perception that they are group of players. These changes were made in order to convert the play into a film through Motion Picture Production Code of time. On the other hand, there were other changes made in order to reduce the level of sexuality that had to be changed in order to facilitate approval of the film in regions dominated by a powerful Roman Catholic Church group and Legion of Decency in America (McCarthy, 2011). Apparently, these alterations were meant to impose business impact would lead to satisfaction. There were other changes made due to objections, for instance in 1993, there was a restoration of this film after changes were made on the original version in Legion that had been disbanded (McCarthy, 2011). There were other changes made in order to prevent certain characters such as Blanche, from portraying their frenetic nature of decency into maelstrom of madness. Furthermore, changes made on scene settings were aimed at increasing

OnTyme - professional personnel engaged in medicine, technical support Research Proposal

OnTyme - professional personnel engaged in medicine, technical support services or emergency services - Research Proposal Example To succeed, it needs to attract and retain a growing base of satisfied customers. Marketing is the tool to bring in customers to a business and has two important principles. All company policies and activities should be tailored towards customer needs and profitable sales volume is more important than maximum sales volume. An appropriate marketing plan will aim at trying to get visibility for its existing brand of "OnTyme" watches as well as the new teenage brand of watches named "Wotch" it. It is common knowledge that no one product will satisfy all kinds of consumers. Therefore, information about the market is invaluable and timely relevant information needs to be obtained. It is impossible to sell products or services that customers do not want. Learning what customers want, and how to present it attractively, drives the need for marketing research. Market research will also demonstrate trends that may show the necessity to enhance an existing product or create a new one. Demographics, Population shifts, legislation passed, and the economic conditions of a market often determine the purchasing power of the buyer in the market place. Market research may also be employed to ascertain the value of a competitor's product and its associated value so that a comparative perceived value could be created for "OnTyme"s product as well. Most business owners ... Analyzing returned items, asking former customers for their feedback, and looking at competitor's prices are all examples of such research. Formal marketing research provides a framework to organize market information. Conducting survey of a sample population to determine their views on the "OnTyme" and competitor brands, Collecting primary data through mail surveys and email questionnaires Personal surveys in high traffic areas like malls, supermarkets etc Probability sampling that identifies who will be interested in purchase of wristwatches, the teen targeted "wotch" brand and the watch with the built in pager based on age, income and gender preferences. Identifying the target segment The target segment for the "OnTyme" might be adults purchasing a watch for their own use, buying it as a gift for someone else, for the "Wotch It" it would be the teenagers and youth, or adults purchasing it for the younger group as a gift. The watch with the built in pager may look at a different segment that is employed and needs to be on call and reachable at all times or parents of teenagers and youth, because the teenagers are now locatable, thanks to their pagers and is a great relief for the adults. Marketing Strategy Once a wider customer base is identified, "OnTyme" needs to formulate a marketing strategy to serve its customers better and align the product to the identified needs of the customer. Ideally, the strategy should address niche needs of the customer especially if there are gaps that need to be filled. This would ensure potential profitability. A good strategy helps a business focus on the target markets it can serve best. Target Marketing Target Marketing helps the concentration of the efforts in the key market

Restriction Fragment Pleomorphism Coursework Example | Topics and Well Written Essays - 1000 words

Restriction Fragment Pleomorphism - Coursework Example Restriction enzymes are highly specific in nature and single alteration in its recognize site (Restriction site) leads to complete inhibition of its activity. In RFLP technique particular gene having restriction site for an enzyme is used to generated DNA fragment(. If there was a mutation in this gene leads to altered restriction site which subsequently resultant in to DNA fragment having altered length. Based on size of a fragment and comparing with standard one can conclude mutation in given gene. Here in case of sample A three bands were obtained when digested with DdeI indicating heterozygous for Gal6V while XhoI digest indicates homozygous for Gal6V clearly indicating anomaly in the results as digestion with two different enzymes give exactly opposite results. Comparing the banding pattern of Gel1A with theoretical banding of standard, there should be 3bands on XhoI digest compared to single band on DdI in case of Gal6V homozygous. But the banding pattern obtained on image 1A was not fitting in to the criteria indicating abnormal preparation. thus all the interpretation were drawn from gel 1B. in case of sample B there was three bands found corresponding to homozygous for CD5(-CT) standard sample while it was found to be heterozygous for GAL6V. Similarly sample C was found to be heterozygous for CD5(-CT) and heterozygous for Gal6V. Three control samples were given as standered namely C1 homozygus for Gal6V, C2- normal individual and C3 homozygus for CD5(-CT). Banding patte rn obtained after digestion with DdeI and XhoI was as shown in fig 1A and 1B. Tabel 1 indicates phenotype and genotype of given sample. Table 1: Summary of Genotype and Phenotype of given sample Sample DdeI enzyme XhoI enzyme Genotype Phenotype A Glu6Val / + CD5(-CT)/ CD5(-CT) Heterozygous Glu6Val and Homozygus CD5(-CT) Thalassemia disease carrier of sickle cell anemia fetus B Glu6V/+ CD5(-CT)/ CD5(-CT) Heterozygous Glu6Val and Homozygus CD5(-CT) Thalassemia disease carrier of sickle cell anemia fetus C Glu6Val / + CD5(-CT)/ + Heterozygous Glu6Val Heterozygus CD5(-CT) Carrier sickle cell Crrier CD5(-CT) Conclusion: Genotyping of given sample were carried out using RFLP technique. The main objective of this study was to identify and differentiate closely related genetic disorder namely sickle cell anemia and thalassemia. Experimental results have indicated that there was some anomaly in electrophoretic patterns and thus experiments has to be performed again be for came in to any conclusion. Similarly experiments have demonstrated both aspect of RFLP at on side the technique was found to be easy, rapid and sensitive while other side it was found that it has some limitations like repeatability, requirement of large