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daphnia background info(2)

daphnia background info(2) - Milk Milk is a mixture of...

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Milk Milk is a mixture of butterfat globules within a water-based fluid. Each fat globule is encircled by a membrane consisting of phospholipids and proteins; these combiners keep the individual globules from joining together into noticeable grains of butterfat and also protect the globules from the fat-digesting activity of enzymes found in the fluid portion of the milk. In unhomogenized cow milk, the fat globules average about four micrometers across. The fat-soluble vitamins A, D, E, and K are found within the milkfat portion of the milk. Vitamin A plays a role in a variety of functions throughout the body, such as: Vision Gene Transcription Immune Function Embryonic Development and Reproduction Bone Metabolism Hematopoiesis Skin Health Reducing Risk of Heart Disease and Cancer Antioxidant Activity Also found in milk is growth hormone; the cow produces this steroid-like substance naturally and is carried in its milk. Small amounts of the hormone are in our everyday milk, even pasteurized milk. This affects human development by speeding up growth and development. Since Vitamin A has an effect on embryonic development, the number of eggs that will hatch may change from the expected (normal) hatching number. Lemonade The pH of ordinary lemonade is 3.8 due to the citric acid content, while Daphnia prefer a pH of 6-8. Because Daphnia can only survive in a neutral pH (7), the acidic conditions that lemonade introduces would likely have a negative effect on the eggs. The sugar in lemonade shouldn’t have an effect on the eggs hatching. Soda
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The pH of coca-cola is 2.5; this means that it would have an even more adverse effect on the hatching of the eggs than the lemonade would most likely have. Caffeine is a bitter white crystalline xanthine alkaloid that acts as a psychoactive stimulant drug and a mild diuretic (speeds up urine production) in humans and other animals.
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