Lee De Forest Lee De Forest was born Aug. 26‚ 1873‚ Council Bluffs‚ Iowa. De Forest was the son of a Congregational minister. His father moved the family to Alabama and there assumed the presidency of the nearly bankrupt Talladega College for Negroes. Excluded by citizens of the white community who resented his father ’s efforts to educate blacks‚ Lee and his brother and sister made friends from among the black children of the town and spent a happy although sternly disciplined childhood
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beakers 4 test tubes 1 test tube clamp 1 test tube rack 1 glass stirring rod 3 teaspoons canned whole-kernel corn 10 ml fresh‚ whole‚pasteurized milk 1 small biuret reagent 1 small benedicts solution 1 small bottle iodine 1 small bottle sudan 4 1 blender Procedures: 1)Heat water in a graduated cylinder . 2)Blend your corn in the blender and add as much water so that it turns into a liquid. 3)Pour 10 ml of fresh milk into a container. 4)Label a set of four test tubes the following:
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Detergent Hydrogen Peroxide Now that all this apparatus has been obtained‚ it is possible to start the experiment. Eight test tubes will be required because the experiment is being done twice in each water bath. Use a marker pen to mark the specific temperature on the test tubes so as to make sure that there are no possible errors. Now place these test tubes in a test tube rack. Take the cork borer no. 4‚ and take a cylinder of potato using the cork borer. Do this until you have eight cylinders.
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of the middle ear‚ the area just behind the eardrum. It happens when the eustachian tubes‚ which connect the middle ear to the nose‚ get blocked with fluid. Mucus‚ pus‚ and bacteria can also pool behind the eardrum‚ causing pressure and pain. Ear infections usually start with a cold. Although adults can get ear infections‚ they are most common in infants and young children. That’s because a child’s eustachian tubes are narrower and shorter than an adults’‚ and it’s easier for fluid to get trapped
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inserting the feeding tube through the nose (nasogastric) or directly through the abdomen into the stomach (gastrostomy). This review discusses the importance of early nutritional assessment and the effectiveness of available nutrition supports on improving nutritional status and life expectancy for ALS patients. This following topics will be discussed: enteral feeding via Percutaneous Endoscopic Gastrostomy (PEG)‚ Percutaneous Radiological Gastrostomy (PRG) and nasogastric tubes
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the mons veneris‚ the major and minor lips‚ the clitoris‚ and the vaginal opening. The internal female sex organs consist of the ovaries‚ the fallopian tubes‚ the uterus‚ and the vagina. The ovaries produce the eggs and the female hormones. The fallopian tubes provide the passageway for the eggs from the ovaries to the uterus. The fallopian tubes also provide a passageway for the sperm so that they can fertilize the egg. Now the uterus will either expand with a growing baby after fertilization of
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were mixed and shaked in a 4-inch test tube. The mixture was centrifuged‚ and the supernate was decantated into a test tube. Separate drops of the supernate was tested for presence of Fe2+‚ Ag+ and Fe 3+ in three different test tubes: Ions Test Reagent Observation Fe2+ 0.10M K3Fe(CN)6 Prussian blue precipitate Fe 3+ 0.10 M KSCN Blood red solution Ag+ 1.00 M HCl White precipitate Copper (II) – Ammonia System 1.00 M NH3 was added dropwise to a test tube filled with 1ml of 0.1 M CuSO4. Contents
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gravity. Particles with different density and masses are settled at different rates in a tube which are response to gravity. Centrifuge is an instrument which can spin carrier vessels at high rotation speed and very high centrifugal force to allow centrifugation. The centrifugal force generated is proportional to the rotation rate of the rotor and the distance between the rotor centre and the centrifuge tube. There are three general classes of centrifuges: low speed‚ about 5000 rpm‚ high speed machine
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Osmosis Trial experiment Aim: Our aim in this experiment is to find out which vegetable absorbs the most liquid over a given time due to osmosis. Chosen Apparatus: we will need to use: six test tubes; a test tube rack; an apple; a potato; a cork borer; a measuring cylinder; sugar solution; scales to measure in milligrams; a ruler; a knife; and a pair of tweezers. Apparatus Why we chose it Advantages Alternative equipment apple Its an absorbent fruit and is similar to a potato It
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w w ap eP m e tr .X w om .c s er UNIVERSITY OF CAMBRIDGE INTERNATIONAL EXAMINATIONS General Certificate of Education Advanced Subsidiary Level and Advanced Level *8712516860* CHEMISTRY 9701/36 Advanced Practical Skills 2 October/November 2012 2 hours Candidates answer on the Question Paper. Additional Materials: As listed in the Confidential Instructions READ THESE INSTRUCTIONS FIRST Write your Centre number‚ candidate number and name on all the
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