Hydrogen bonding also plays an important role in determining the three-dimensional structures adopted by proteins and nucleic acids. In these macromolecules, bonding between parts of the same macromolecule cause it to fold into a specific shape, which helps determine the molecule's physiological or biochemical role. The double helical structure of DNA, for example, is due largely to hydrogen bonding between the base pairs, which ...

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Hydrogen bond, Hydrogen bond - Hydrogen bond in water, Hydrogen bond - Hydrogen bond in proteins and DNA, Hydrogen bond - Symmetric hydrogen bond, Hydrogen bond - Dihydrogen bond, Hydrogen bond - Advanced theory of the hydrogen bond

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Liquid ammonia is the best-known and most widely studied non-aqueous ionizing solvent. Its most conspicuous property is its ability to dissolve alkali metals to form highly coloured, electrically conducting solutions containing solvated electrons. Apart from these remarkable solutions, much of the chemistry in liquid ammonia can be classified by analogy with related reactions in aqueous solutions. Comparison of the physical properties of NH3 with those of water shows that NH3 has the lower melting point, boiling point, ...

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Ammonia, Ammonia - History, Ammonia - Production, Ammonia - Properties, Ammonia - Formation of salts, Ammonia - Acidity, Ammonia - Formation of other compounds, Ammonia - Ammonia as a ligand, Ammonia - Uses, Ammonia - Liquid ammonia as a solvent, Ammonia - Solubility of salts, Ammonia - Solutions of metals, Ammonia - Redox properties of liquid ammonia, Ammonia - Detection and determination, Ammonia - Safety precautions, Ammonia - Toxicity, Ammonia - Household use, Ammonia - Laboratory use of ammonia solutions, Ammonia - Laboratory use of anhydrous ammonia gas or liquid, Ammonia - Reference, Ammonia - Bibliography

Read more here: » Ammonia: Encyclopedia II - Ammonia - Liquid ammonia as a solvent

Salts of ammonia have been known from very early times; thus the term Hammoniacus sal appears in the writings of Pliny, although it is not known whether the term is identical with the more modern sal-ammoniac. In the form of sal-ammoniac, ammonia was known to the alchemists as early as the 13th century, being mentioned by Albertus Magnus. It was also used by dyers in the Middle Ages in the form of fermented urine to alter the colour of vegetable dyes. In the 15th century, Basilius Valentinus showed that ammonia could be ...

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Ammonia, Ammonia - History, Ammonia - Production, Ammonia - Properties, Ammonia - Formation of salts, Ammonia - Acidity, Ammonia - Formation of other compounds, Ammonia - Ammonia as a ligand, Ammonia - Uses, Ammonia - Liquid ammonia as a solvent, Ammonia - Solubility of salts, Ammonia - Solutions of metals, Ammonia - Redox properties of liquid ammonia, Ammonia - Detection and determination, Ammonia - Safety precautions, Ammonia - Toxicity, Ammonia - Household use, Ammonia - Laboratory use of ammonia solutions, Ammonia - Laboratory use of anhydrous ammonia gas or liquid, Ammonia - Reference, Ammonia - Bibliography

Read more here: » Ammonia: Encyclopedia II - Ammonia - History

Because of its many uses, ammonia is one of the most highly-produced inorganic chemicals. Before the start of WWI most ammonia was obtained by the dry distillation of nitrogenous vegetable and animal products; by the reduction of nitrous acid and nitrites with nascent hydrogen; and also by the decomposition of ammonium salts by alkaline hydroxides or by quicklime, the salt most generally used being the chloride (sal-ammoniac) thus 2NH4Cl + 2CaO → CaCl2 + Ca(OH)2See also:

Ammonia, Ammonia - History, Ammonia - Production, Ammonia - Properties, Ammonia - Formation of salts, Ammonia - Acidity, Ammonia - Formation of other compounds, Ammonia - Ammonia as a ligand, Ammonia - Uses, Ammonia - Liquid ammonia as a solvent, Ammonia - Solubility of salts, Ammonia - Solutions of metals, Ammonia - Redox properties of liquid ammonia, Ammonia - Detection and determination, Ammonia - Safety precautions, Ammonia - Toxicity, Ammonia - Household use, Ammonia - Laboratory use of ammonia solutions, Ammonia - Laboratory use of anhydrous ammonia gas or liquid, Ammonia - Reference, Ammonia - Bibliography

Read more here: » Ammonia: Encyclopedia II - Ammonia - Production

Acetic acid is produced both synthetically and by bacterial fermentation. Today, the biological route accounts for only about 10% of world production, but it remains important for vinegar production, as in much of the world food purity laws stipulate that vinegar used in foods must be of biological origin. About 75% of acetic acid made for use in the chemical industry is made by methanol carbonylation, explained below. Alternative methods account for the rest.^{See also:}

Acetic acid, Acetic acid - Nomenclature, Acetic acid - History, Acetic acid - Chemical properties, Acetic acid - Biochemistry, Acetic acid - Production, Acetic acid - Methanol carbonylation, Acetic acid - Acetaldehyde oxidation, Acetic acid - Ethylene oxidation, Acetic acid - Fermentation, Acetic acid - Applications, Acetic acid - Vinyl acetate monomer, Acetic acid - Acetic anhydride, Acetic acid - Ester production, Acetic acid - Vinegar, Acetic acid - Use as solvent, Acetic acid - Other applications, Acetic acid - Safety

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Hydrogen sulfide used to have importance in analytical chemistry for well over a century, in the qualitative inorganic analysis of metal ions. For such small-scale laboratory use, H2S was made as needed in a Kipp generator by reaction of sulfuric acid H2SO4 with ferrous sulfide FeS. Kipp generators were superceded by the use of thioacetamide, an organic solid that converts in water to H2S. In these analyses, heavy metal (and nonmetal) ions (e.g. Pb(II), Cu(I), Hg(II), As(III)) are precipitated from solution upon exposure to H2S. The components of the ...

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Hydrogen sulfide, Hydrogen sulfide - Chemistry, Hydrogen sulfide - Occurrence, Hydrogen sulfide - Manufacture and use, Hydrogen sulfide - Dangers, Hydrogen sulfide - Health effects, Hydrogen sulfide - Function in the body, Hydrogen sulfide - Induced hibernation, Hydrogen sulfide - Participant in the sulfur cycle, Hydrogen sulfide - Reference

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Ammonia is a colourless gas with a characteristic pungent smell; it is lighter than air, its density being 0.589 times that of air. It is easily liquefied and the liquid boils at -33.7 °C, and solidifies at -75 °C to a mass of white crystals. Liquid ammonia possesses strong ionizing powers (ε = 22), and solutions of salts in liquid ammonia have been much studied. Liquid ammonia has a very high standard enthalpy change of vaporization (23.35 kJ/mol, c.f. water 40.65 kJ/mol, methane 8.19 kJ/mol, phosphine 14.6 kJ/mol) and can therefore be used in laboratories in non-insulated vessels at room temperature, even thou ...

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Ammonia, Ammonia - History, Ammonia - Production, Ammonia - Properties, Ammonia - Formation of salts, Ammonia - Acidity, Ammonia - Formation of other compounds, Ammonia - Ammonia as a ligand, Ammonia - Uses, Ammonia - Liquid ammonia as a solvent, Ammonia - Solubility of salts, Ammonia - Solutions of metals, Ammonia - Redox properties of liquid ammonia, Ammonia - Detection and determination, Ammonia - Safety precautions, Ammonia - Toxicity, Ammonia - Household use, Ammonia - Laboratory use of ammonia solutions, Ammonia - Laboratory use of anhydrous ammonia gas or liquid, Ammonia - Reference, Ammonia - Bibliography

Read more here: » Ammonia: Encyclopedia II - Ammonia - Properties

Biotin - Hair problems. Biotin supplements are often recommended as a natural product to counteract the problem of hair loss in both children and adults. However, there are no studies that show any benefit in any case where the subject is not actually biotin deficient. The signs and symptoms of biotin deficiency include hair loss which progresses in severity to include loss of eye lashes and eye brows in severely deficient subjects. Of note, shampoos that include biotin might be more effective if they were drunk ...

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Biotin, Biotin - General overview, Biotin - Uses, Biotin - Hair problems, Biotin - Cradle cap seborrheic dermatitis, Biotin - Diabetes, Biotin - Biotin deficiency, Biotin - Biochemistry

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Hydrogen sulfide is produced in small amounts by some cells of the mammalian body and has a number of biological functions. (Only two other such gases are currently known: nitric oxide NO and carbon monoxide CO.) It is produced from cysteine by various enzymes. It acts as a vasodilator and is also active in the brain, where it increases the response of the NMDA receptor and facilitates long term potentiation, which is involved in the formation of memory. Eventually the gas is converted to ...

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Hydrogen sulfide, Hydrogen sulfide - Chemistry, Hydrogen sulfide - Occurrence, Hydrogen sulfide - Manufacture and use, Hydrogen sulfide - Dangers, Hydrogen sulfide - Health effects, Hydrogen sulfide - Function in the body, Hydrogen sulfide - Induced hibernation, Hydrogen sulfide - Participant in the sulfur cycle, Hydrogen sulfide - Reference

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The most important single use of ammonia is in the production of nitric acid. A mixture of one part ammonia to nine parts air is passed over a platinum gauze catalyst at 850 °C, whereupon the ammonia is oxidized to nitric oxide. 4NH3 + 5O2 → 4NO + 6H2O The catalyst is essential, as the normal oxidation (or combustion) of ammonia gives dinitrogen and water: the production of nitric oxide is an example of kinetic control. As the gas mixture cools to 200–250 ...

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Ammonia, Ammonia - History, Ammonia - Production, Ammonia - Properties, Ammonia - Formation of salts, Ammonia - Acidity, Ammonia - Formation of other compounds, Ammonia - Ammonia as a ligand, Ammonia - Uses, Ammonia - Liquid ammonia as a solvent, Ammonia - Solubility of salts, Ammonia - Solutions of metals, Ammonia - Redox properties of liquid ammonia, Ammonia - Detection and determination, Ammonia - Safety precautions, Ammonia - Toxicity, Ammonia - Household use, Ammonia - Laboratory use of ammonia solutions, Ammonia - Laboratory use of anhydrous ammonia gas or liquid, Ammonia - Reference, Ammonia - Bibliography

Read more here: » Ammonia: Encyclopedia II - Ammonia - Uses

Ammonia - Toxicity. The toxicity of ammonia solutions does not usually cause problems for humans and other mammals, as a specific mechanism exists to prevent its build-up in the bloodstream. Ammonia is converted to carbamoyl phosphate by the enzyme carbamoyl phosphate synthase, and then enters the urea cycle to be either incorporated into amino acids or excreted in the urine. However fish and amphibians lack this mechanism, as they can usually eliminate ammonia from their bodies by direct excretion. Ammonia even at dilute concentrations is highly toxic to aquatic animals, and for this reason it is class ...

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Ammonia, Ammonia - History, Ammonia - Production, Ammonia - Properties, Ammonia - Formation of salts, Ammonia - Acidity, Ammonia - Formation of other compounds, Ammonia - Ammonia as a ligand, Ammonia - Uses, Ammonia - Liquid ammonia as a solvent, Ammonia - Solubility of salts, Ammonia - Solutions of metals, Ammonia - Redox properties of liquid ammonia, Ammonia - Detection and determination, Ammonia - Safety precautions, Ammonia - Toxicity, Ammonia - Household use, Ammonia - Laboratory use of ammonia solutions, Ammonia - Laboratory use of anhydrous ammonia gas or liquid, Ammonia - Reference, Ammonia - Bibliography

Read more here: » Ammonia: Encyclopedia II - Ammonia - Safety precautions

Biotin deficiency is a rare nutritional disorder caused by a deficiency of biotin. Biotin deficiency can have a very serious, even fatal, outcome if it is allowed to progress without treatment. Signs and symptoms of biotin deficiency can develop in persons of any age, race, or gender. Biotin deficiency rarely occurs in healthy individuals, since the daily requirements of biotin are low, many foods contain adequate amounts, intestinal bacteria synthesize small amounts, and the body effectively scavenges and recycles biotin from bodily waste. ...

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Biotin, Biotin - General overview, Biotin - Uses, Biotin - Hair problems, Biotin - Cradle cap seborrheic dermatitis, Biotin - Diabetes, Biotin - Biotin deficiency, Biotin - Biochemistry

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Small amounts of hydrogen sulfide occur in crude petroleum but natural gas can contain up to 28%. Volcanoes and hot springs emit some H2S, where it probably arises via the hydrolysis of sulfide minerals, i.e. MS + H2O to give MO + H2S. Normal average concentration in clean air is about 0.0001-0.0002 ppm. Sulfate-reducing bacteria obtain their energy by oxidizing organic matter or hydrogen with sulfates, producing H2S. These microorganisms are prevalent in low-oxygen environments, such ...

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Hydrogen sulfide, Hydrogen sulfide - Chemistry, Hydrogen sulfide - Occurrence, Hydrogen sulfide - Manufacture and use, Hydrogen sulfide - Dangers, Hydrogen sulfide - Health effects, Hydrogen sulfide - Function in the body, Hydrogen sulfide - Induced hibernation, Hydrogen sulfide - Participant in the sulfur cycle, Hydrogen sulfide - Reference

Read more here: » Hydrogen sulfide: Encyclopedia II - Hydrogen sulfide - Occurrence

Given their high affinities to form inclusion complexes cucurbiturils have been employed as the macrocycles component of a rotaxane. After formation of the supramolecular assembly or threaded complex with a guest molecule such as hexamethylene diamine the two ends of the guest can be reacted with bulky groups that will then act as a stoppers preventing the two separate molecules from dissociating^{See also:}

Cucurbituril, Cucurbituril - Synthesis, Cucurbituril - Host guest chemistry, Cucurbituril - Applications, Cucurbituril - Nomenclature, Cucurbituril - Related compounds, Cucurbituril - Systematic name

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The gas is highly toxic. It is slightly heavier than air, so tends to concentrate at the bottom of poorly ventilated spaces - deep wells, sewers, underground tanks. It is also highly flammable, forming an explosive mixture with air over a wide range of concentrations (4.3-46%, or 43000-460000 ppm). Breathing hydrogen sulfide may paralyze the olfactory nerve making it impossible to smell the gas after an initial strong exposure. The effect appears reversible, i.e. people who survive intense exposure to H2See also:

Hydrogen sulfide, Hydrogen sulfide - Chemistry, Hydrogen sulfide - Occurrence, Hydrogen sulfide - Manufacture and use, Hydrogen sulfide - Dangers, Hydrogen sulfide - Health effects, Hydrogen sulfide - Function in the body, Hydrogen sulfide - Induced hibernation, Hydrogen sulfide - Participant in the sulfur cycle, Hydrogen sulfide - Reference

Read more here: » Hydrogen sulfide: Encyclopedia II - Hydrogen sulfide - Dangers

Hydrogen sulfide is considered a broad-spectrum poison, meaning that it can poison several different systems in the body, although the nervous system is most affected. The toxicity of H2S is comparable with that of hydrogen cyanide. It forms a complex bond with iron in the mitochondrial cytochrome enzymes, thereby blocking oxygen from binding and stopping cellular respiration. Loss of consciousness can result after one or more breaths. Cases of acute hydrogen sulfide poisonings are rare, occurring mostly in industrial settings; ho ...

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Hydrogen sulfide, Hydrogen sulfide - Chemistry, Hydrogen sulfide - Occurrence, Hydrogen sulfide - Manufacture and use, Hydrogen sulfide - Dangers, Hydrogen sulfide - Health effects, Hydrogen sulfide - Function in the body, Hydrogen sulfide - Induced hibernation, Hydrogen sulfide - Participant in the sulfur cycle, Hydrogen sulfide - Reference

Read more here: » Hydrogen sulfide: Encyclopedia II - Hydrogen sulfide - Health effects

In 2005, Mark Roth and other scientists from the University of Washington and the Fred Hutchinson Cancer Research Center in Seattle demonstrated that mice can be put into a state of suspended animation by applying a low dosage of hydrogen sulfide (80 ppm H2S) in the air. The breathing rate of the animals sank from 120 to 10 breaths per minute and their temperature fell from 37 °C to 2 °C above ambient temperature (in effect, they had become cold-blooded). The mice survived this procedure for 6 hour ...

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Hydrogen sulfide, Hydrogen sulfide - Chemistry, Hydrogen sulfide - Occurrence, Hydrogen sulfide - Manufacture and use, Hydrogen sulfide - Dangers, Hydrogen sulfide - Health effects, Hydrogen sulfide - Function in the body, Hydrogen sulfide - Induced hibernation, Hydrogen sulfide - Participant in the sulfur cycle, Hydrogen sulfide - Reference

Read more here: » Hydrogen sulfide: Encyclopedia II - Hydrogen sulfide - Induced hibernation

Quantitative notation of concentration is far more informative and useful from a scientific point of view. There are a number of different ways to quantitatively express concentration; the most common are listed below. Note: Many units of concentration require measurement of a substance's volume, which is variable depending on ambient temperature and pressure. Unless otherwise stated, all the following measurements are assumed to be at standard state temperature and pressure (that is, 25 degrees Celsius at 1 atmosphere or 101.325 kPa).

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Concentration, Concentration - Qualitative notation, Concentration - Quantitative notation, Concentration - Mass percentage, Concentration - Mass-volume percentage, Concentration - Volume-volume percentage, Concentration - Molarity, Concentration - Molality, Concentration - Molinity, Concentration - Normality, Concentration - Mole fraction, Concentration - Formal, Concentration - Parts-per notation, Concentration - Techniques used to determine concentration, Concentration - Table of concentration measures

Read more here: » Concentration: Encyclopedia II - Concentration - Quantitative notation

The most pronounced decrease in ozone has been in the lower stratosphere. However, the ozone hole is most usually measured not in terms of ozone concentrations at these levels (which are typically of a few parts per million) but by reduction in the total column ozone, above a point on the Earth's surface, which is normally expressed in Dobson units. Marked decreases in column ozone in the Antarctic spring and early summer compared to the early 1970s and before have been observed using instruments such as ...

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Ozone depletion, Ozone depletion - Ozone cycle overview, Ozone depletion - Ozone creation, Ozone depletion - Ozone destruction, Ozone depletion - Observations, Ozone depletion - Chemicals in the atmosphere, Ozone depletion - Verification of observations, Ozone depletion - The ozone hole and its causes, Ozone depletion - Interest in ozone hole, Ozone depletion - Consequences of ozone depletion, Ozone depletion - Increased UV due to the ozone hole, Ozone depletion - Biological effects of increased UV, Ozone depletion - Public policy in response to the ozone hole, Ozone depletion - The future of ozone depletion, Ozone depletion - History of the research, Ozone depletion - Controversy regarding ozone science and policy, Ozone depletion - Myths about ozone depletion, Ozone depletion - CFC's are too heavy to reach the stratosphere?, Ozone depletion - Natural chlorine sources are far larger than the CFC source?, Ozone depletion - An ozone hole was first observed in 1956?, Ozone depletion - World Ozone Day

Read more here: » Ozone depletion: Encyclopedia II - Ozone depletion - Observations

There exists a relationship between the value of Ka for an acid HA and the value of Kb for its conjugate base A–. Since adding the ionization reaction for HA and the ionization reaction of A– always gives the reaction for the self-ionization of water, the product of the acidity and basicity constants gives the dissociation constant of water (Kw), which is 1 ...

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Acid dissociation constant, Acid dissociation constant - Basicity constant of the conjugate base, Acid dissociation constant - Relationship between acidity and basicity constants, Acid dissociation constant - The Relative Strengths of Acids and Bases, Acid dissociation constant - pKa of some common substances

Read more here: » Acid dissociation constant: Encyclopedia II - Acid dissociation constant - Relationship between acidity and basicity constants

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