Thursday, February 13, 2020

Research Paper - Solar Technology, system, advantages and

- Solar Technology, system, advantages and disadvantages to the world - Research Paper Example earchers began to create applications for military or governmental purposes only, as huge costs of such applications limited existence of its notion for consumer purposes (National Research Council, pp. 111-129, 2000). In specific, the major decisive moment involving studies on solar energy was oil crisis of early 1970s due to lack of support of Arab countries, as they objected to export oil to countries that were supporting Israel in the conflict. Moreover, intervention and support of OAPEC resulted in intensification of such crisis that enforced Western countries to look for other energy sources to fulfill their requirements (SEIA, pp. 1-12, 2008). In the result, Western governments began to finance projects involving prospects of solar technology for commercial purposes, and such efforts have continued to identify and analyze different aspects of the solar technology that can offer cost-effective electricity for commercial, as well as residential purposes. It is an observation that studies related to benefits and drawbacks of solar technology have indicated three focus areas related to the production of electricity from solar energy. In first focus area, thermal energy acquired from the sun is concentrated for running a generator that subsequently generates electricity, and such process of optical concentration of thermal energy is carried out by CSE, also refer as ‘concentrating solar energy.’ Some of the major examples of such a focus area of solar technology are irrigation, locomotion, etc that are using CSEs to generate electricity for their purposes (SEIA, pp. 1-12, 2008). On the other hand, air or water is heated with the help of absorbers of radiation of sun, acquired through SWL; also refer as solar water heaters. Such heaters are usually present in commercial locations like hotels, malls, etc. The third alternative of generating electricity through solar energy is conversion of sunlight through an electronic procedure with the help of certain

Saturday, February 1, 2020

Isolation, Enumeration, Identification and Confirmation of Lab Report

Isolation, Enumeration, Identification and Confirmation of Food-Poisoning Microbes from Food ( ) - Lab Report Example In our experiment we will test 10g of lettuce for presence of bacteria that presumably caused outbreak of food-poisoning in a local school. Several children have been complaining of diarrhea, abdominal pain and some have started passing blood in their stool. The lettuce was on the menu as a fresh salad 3 days earlier. We will try to conduct microbiological investigation of the bacteria that are present in the lettuce. Then we will identify if there are present any organisms that can cause food born infection. If organisms are found we will try to find the specific group of bacteria. Also we will have to calculate the concentration of these bacteria and made a conclusion if this concentration is sufficient to cause a disease. In order to test for presence for bacteria we will prepare the food sample for examination. The lettuce was placed in Maximum recovery diluent (MRD) which is an isotonic liquid that contains small concentrations of peptone and it is used to maintaining the viability of eventually present organisms in the food. We than placed the lettuce in 90ml of MRD and put it in the stomacher for 30 sec. The stomacher transforms the food sample into homogenous suspension and promotes the releasing the bacteria into the liquid medium (MRD). We than made different dilutions of the suspension (10-1 10-2 10-3 10-4 10-5 and 10-6) and inoculated them on different agar mediums. We used: Nutrition agar that was inoculated with 10-6 dilution of the suspension had 196 colony forming units, and according from the provided guidance, this dilution was used to calculate the colony forming units per gram according to the formula cfu/gram = No. of colonies x 10 x dilution factor. According to the formula the result nutrient agar produced 10140 cfu/gram. The Violet red bile glucose agar (VRBG) that was inoculated with dilution of 10-6