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What is Schiff's reagent?

Schiff's reagent is named after Hugo Schiff, a German chemist who lived from 1834 until 1915, and who first used this preparation to test for the presence of aldehydes when performing organic chemistry reactions. The process of adding the reagent to a chemical solution is referred to as Schiff's test. It is one of the earliest organic chemistry dye tests to have been widely used for detection of a certain functional group in chemical solutions.\nSchiff's reagent is also sometimes used to dye organic tissues. When used for this purpose, several drops of the reagent are added to a..

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What are some examples of diurnal animals?

Scientists generally agree that diurnality is a product of evolution. The process of evolution has allowed for animals to take advantage of all possible niches; therefore, some animals are adapted either for daytime activity, night time activity, or dusk and dawn activity. That way, environmental resources are in use at all times without extreme competition for food or shelter. Diurnality is thought to be dictated by circadian rhythms, which are 24-hour cycles of physical, mental and behavioral patterns that respond to light and darkness in an environment.\nSome animals, such as domesticated d..

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What is gold made from?

The extremely high energy of supernovae and neutron star collisions produces other elements heavier than iron, including platinum and uranium. Because of the rarity of such explosions and collisions, the amount of gold present in the universe is much lower than that of more easily created elements, such as carbon, nitrogen, oxygen and silicon.

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How many electrons does silicon have?

Silicon was discovered in 1824 by Jons Berzelius. The symbol for silicon is Si. It is a solid at room temperature and classified as a semi-metal. It belongs to group 14 and period 2 of the periodic table of elements. The melting point of silicon is 2,577 degrees Fahrenheit, and its boiling point is 5,909 degrees Fahrenheit. The density of silicon is 2.3296 grams per cubic centimeter. Silicon exists in crystalline and amorphous forms at room temperature.

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What is another name for anaerobic respiration?

Glycolysis allows for both aerobic and anaerobic respiration through the breakdown of glucose. Fermentation enables anaerobic respiration by donating electrons and hydrogen ions produced through glycolysis to other molecules. Fermentation is also used by muscle cells to make lactic acid, which the body needs for energy during periods of low oxygen levels.

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What is the SETI "WOW!" signal?

Radio telescopes probe space for signals from stars and measurement of background radiation from the Big Bang. Stellar radio signals have a distinct signature, so the Search for Extraterrestrial Intelligence (SETI) project looks for different patterns and signal sequences that would indicate transmission by some intelligent entity. The sequence Jerry Ehman found showed many characteristics suggesting it was not background noise. He searched for a repeat signal for several weeks but never found it again. Various explanations about its origin still don’t provide a solid answer, so the “WOWâ€..

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What are examples of recyclable resources?

Besides paper, plastic, glass and metal, many other resources can be recycled. Some less commonly known recyclable resources are bricks, asphalt, concrete, oil and sand. These less commonly known resources should be taken to special centers that recycle them and placed in the blue bins that cities provide for regular recycling purposes.\nMany major U.S. cities also have programs to collect and recycle organic materials, as when collecting yard waste for composting. Composting speeds up the decomposition process in organic materials with the resulting materials used to feed plants. Santa Barbar..

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What are the stages of human fetal development?

The beginning of a pregnancy actually occurs on the first day of a woman's last menstrual period. This period, known as the menstrual age, typically occurs two weeks prior to conception, as reported by Cleveland Clinic.\nFertilization occurs after sexual intercourse, when the sperm penetrates the egg, forming a zygote. The zygote enters the uterus in three to five days In the uterus, where it develops into a hollow ball of cells called a blastocyst. Following an additional two to three days, the blastocyst attaches to the lining of the uterus, typically near the top. This process, known a..

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How do archaebacteria reproduce?

Binary fission occurs when a cell's single DNA strand replicates, and both the original and the new strand attach to the cell membrane that lines the outer wall. The membrane grows between the two strands, eventually pinching in from the point of new growth. The external cell wall grows along with the membrane until the archaea is split into two identical organisms called daughter cells. In most cases, this is a gradual process, but some archaea use snapping division, in which the daughter cells snap apart after about two minutes of rapid vibration. Some archaea use the bacterial fission ..

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What is beyond the universe?

There are several theories that attempt to speculate on the size of our universe, but some scientists have also theorized on what lies beyond our universe. The most prominent of these theories is called string theory, which postulates that our universe is just part of something scientists call the multiverse. This means that our universe is just a massive bubble of space-time, of near infinite size, amongst an infinite amount of other space-time bubbles. Though it is impossible to prove this, the string theory considers it possible that beyond our universe lies an innumerable host of other uni..

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