Extraction of Caffeine from Tea Leaves using Dichloromethane (CH2Cl2) Abstract The extraction of caffeine (C8H10N402) was done in two parts. The first procedure used was solid-liquid extraction which was done by boiling the tea leaves in 100 ml. distilled water for 5-10 minutes. The filtrate was acquired and was extracted again by liquid-liquid extraction using dichloromethane (CH2Cl2). The combined DCM (CH2Cl2) was washed and dried to yield crude caffeine. The crude caffeine was purified
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Abstract This experiment focused on extracting and separating pigments of Chloroplast. For the procedure green leaves were grinded in a mortar with some chemicals and the fluid was filtrated to use for further analysis. Stripes of this solution were put on a filter paper and later‚ after dried placed into a beacon of solvent. After this the chloroplast pigments were separated by the solvent into groups of more or less soluble pigments. Aim How many pigment types are present in a green leaf? It
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A PROPOSED LEAVE MANAGEMENT SYSTEM FOR DUTCH-BANGLA BANK LIMITED MD. NASIRUZZAMAN CHOUDHURY Student ID: 01101042 Department of Computer Science and Engineering December 2005ii A PROPOSED LEAVE MANAGEMENT SYSTEM FOR DUTCH-BANGLA BANK LIMITED A Thesis Submitted to the Department of Computer Science and Engineering of BRAC University by Md. Nasiruzzaman Choudhury Student ID: 01101042 In Partial Fulfillment of the Requirements for the Degree of Bachelor of Science in Computer Science
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The Family Medical Leave Act (FMLA) was eight long years in the making. After many bitter debates between the Republicans and Democrats‚ Congress passed the Act on February 4‚ 1993. President Clinton signed the measure into law the following day. The Act became effective on August 5‚ 1993. The Act required employers with fifty or more employees within a seventy-five mile radius to offer eligible employees up to twelve weeks of unpaid leave during a twelve month period for a variety of medical
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Humanitarian aid to Kyrgyzstan is sent from Shymkent Kazakhstan continues to provide humanitarian assistance to Kyrgyzstan. Many regions of our country had already sent much cargo to the brotherly republic‚ which suffered from the riots. Last night the party of fittings from Shymkent was sent to the neighbouring state. The government allocated 103 500 000 tenge to the Ministry of Emergency Situations from the republican budget aimed for emergency expenses. Building materials for the entire amount
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Introduction 1.1 Problem Statement Fractures are prevalent in natural and synthetic structural media‚ even in the best engineered materials. We find fractures in bedrock‚ in sandstone aquifers and oil reservoirs‚ in clay layers and even in unconsolidated materials (Figures 1.1 to 1.4). Fractures are also common in concrete‚ used either as a structural material or as a liner for storage tanks (Figure 1.5). Clay liners used in landfills‚ sludge and brine disposal pits or for underground storage
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Sales coordinator Sales coordinators perform many of the clerical duties delegated to administrative assistants. However‚ unlike administrative staff‚ sales coordinators support sales managers and representatives exclusively. Sales coordinators support sales management and staff by answering and routing incoming client calls‚ processing expense reports‚ maintaining sales calendars‚ and entering prospect and customer information into contact management databases. These professionals also help assemble
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of farmers in their farm lots are kuhols‚ specifically the Golden Apple Snail‚ which pests their plants. Golden apple snail The Golden Apple Snail is amphibious. While there is a sufficient level of dissolved oxygen in the water‚ they will hardly leave the water and will breathe by their gills. If the level of dissolved oxygen gets to low‚ the snails will go up to the surface and breathe with their lung (mostly by using its siphon‚ a tube that it extracts to the water surface). While filling their
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Camellia Caraway December 20‚ 2011 CP150: Introduction to Computers Unit 13 Essay For years maternity leave has been a benefit that has been provided for mothers-to-be by employers and companies. However‚ there are not too many companies that provide the same benefit to fathers-to-be. Companies should offer paternity leave for expectant fathers. By offering paternity leave for fathers-to-be companies allow fathers to be a benefit of paid or unpaid time off work to care for their child‚ make
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2) At high altitude The effects of high altitude on humans are considerable. The percentage saturation of hemoglobin with oxygen determines the content of oxygen in our blood. After the human body reaches around 2‚100 m (7‚000 feet) above sea level‚ the saturation of oxyhaemoglobin begins to plummet. However‚ the human body has both short-term and long-term adaptations to altitude. Athletes use these adaptations to help their performance. There is a limit to the level of adaptation; mountaineers
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