Hypothesis : When the quails’ eggs are immersed into 0% (distilled water), 5%, and 15% concentration of sodium chloride solution, the final mass of the quails’ eggs will increase. But when the quails’ eggs are immersed into 30% and 45% concentration of sodium chloride solution, the final mass of the quails eggs will decrease. http://www.biologyjunction.com/osmosis_lab_report_sample_4_prea.htm ,visited on 30/8/2012
The parathyroid glands are four tiny glands, located in the neck, that control the body's calcium levels. Each gland is about the size of a grain of rice (weighs approximately 30 milligrams and is 3-4 millimeters in diameter). The parathyroids produce a hormone called parathyroid hormone (PTH). PTHPTH - parathyroid hormone raises the blood calcium level by: 1: breaking down the bone (where most of the body's calcium is stored) and causing calcium release 2: increasing the body's ability to absorb calcium from food 3: increasing the kidney's ability to hold on to calcium that would otherwise be lost in the urine. Normal parathyroid glands work like the thermostat in your home to keep blood calcium levels in a very tightly controlled range.
Fewer than 1,000 sperm out of the millions in the semen reach the Fallopian tubes, and only a few dozen actually reach the membrane of the egg. The lucky few sperm who reached the egg in the Fallopian tube surround it and begin competing for entrance. The head of each sperm, the acrosome, releases enzymes that begin to break down the outer, jelly-like layer of the egg's membrane, trying to penetrate the egg. Once a single sperm has penetrated, the cell membrane of the egg changes its electrical characteristics. This electrical signal causes small sacs just beneath the membrane to dump their contents into the space surrounding the egg.
Sometimes this outer layer is absent. Unfertilized eggs are larger and can be measured up to 90 µm in length. | Starfish | Animalia | Echinodermata | Their ability to regenerate different (missing) parts of their body. If predator eats part of the starfish, remaining part (one arm for example) will develop missing arms and bring back previous look after some time. This process is not always fast and it may last up to one year.
(Concept 6.1 ) The first step in cell fractionation is disruption of the cells and their organelles. Organelles that are largest or heaviest are likely to be isolated earlier in the fractionation procedure than those that are smaller or lighter. Organelles are separated by spinning the cell extract at several different speeds in a centrifuge. When a cell extract is centrifuged, smaller organelles end up in the pellet at the bottom of the tube and larger organelles remain in the liquid above the pellet. Isolation of the smallest organelles (such as ribosomes) requires very high centrifuge speeds.
7) Find the sum of three whole numbers is 7 X , 2x=1, ( 6-3x) (6-3x)+x=(2x+1)-3 6-2x=2x-2 8=4x X=2. The three numbers are 5,2, and 0 since the only other two numbers that can be used to equal 7 would be 5 and 0 8) Eggs + Meats must be ≤ 300Mg 150e+ 100m ≤ 300 9) See attached graph file 10) See attached graph
2) Define weighted average- An average that takes into account the proportional relevance of each component, rather than treating each component equally. 3) Place one atom of each isotope on the scale. Divide the mass by 3 to fine the straight average. How is this number different from your average atomic mass? Number – 19g average mass 1.7g 4) If a 4th isotope of beanium, D (green), were added to the pool, how would the average atomic mass change?
More than the number of blocks required was prepared allowing the discharge of non-standard demineralized blocks on the DES experiment. Formulation of saliva (RE and DE experiment) The basic composition of the artificial saliva used in G1 was given by Klimek et al [Klimek et al., 1982]: 0.33 g of KH2PO4, 0.34 g of Na2HPO4, 1.27 g of KCL, 0.16 g of NaSCN, 0.58g of NaCl, 0.17g of CaCl2, 0.16 g of NH4Cl, 0.2 g of urea, 0.03 g of glucose, 0.002g of ascorbic acid and 2.7 g of porcine mucin in 1,000 ml of distilled water, pH 7.0. The chemicals used were of analytical grade (Merck, Darmstadt, Germany). The saliva used in G2 was the same that in G1, except for the addition of mucin. In situ procedures (RE and DE
Giardia exists in active (trophozoite) and dormant (cyst) stages. Its active, motile , but noninfective, trophozoite stage takes place after the Giardia cyst has entered the host. Each cyst undergoes a process called excystation, by which it produces 2 to 4 trophozoites. The trophozoite has a length from 9 to 21 μm and width of 5 to 15 μm. Each trophozoite possesses two nuclei and four pairs of flagella.
Molecular Exclusion Chromatography Definition: Molecular Exclusion Chromatography also called Size Exclusion Chromatography brings 4 words to mind - hopefully. They are Chromatography, Separation (Exclusion), Molecule and Size. Putting them all together we can say that molecular exclusion chromatography (MEC) is a chromatographic method that involves the separation of molecules by size, i.e. larger molecules are separated from smaller ones. These molecules are in solution.