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H| There are 22 entries in the glossary. |
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| Hairpin | A double helical region formed by base pairing between adjacent (inverted) complementary sequences in a single strand of RNA or DNA. |
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| Haloenzyme | An enzyme that contains a non-protein component. |
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| Halogen | One of the chlorine group (bromine, chlorine, fluorine, iodine) of elements, all univalent; they form monobasic acids with hydrogen, and their hydroxides (fluorine forms none) are monobasic acids. The radioactive element, astatine, also belongs to the halogen group. |
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| Halophile | An organism that displays accelerated growth or is dependent on high salt concentrations. |
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| Handwritten Signature | The scripted name or legal mark of an individual handwritten by that individual and executed or adopted with the present intention to authenticate a writing in a permanent form. The act of signing with a writing or marking instrument such as a pen or stylus is preserved. The scripted name or legal mark, while conventionally applied to paper, may also be applied to other devices that capture the name or mark. |
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| Haploid | A single set of chromosomes (half the full set of genetic material), present in the egg and sperm cells of animals and in the egg and pollen cells of plants. Human beings have 23 chromosomes in their reproductive cells. |
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| Hardness | Concentration of calcium and magnesium salts in water. Hardness originally referred to the soap-consuming power of water; as such it is sometimes also taken to include iron and manganese. "Permanent hardness" also known as "noncarbonated hardness " is the excess of hardness over alkalinity. "Temporary hardness" also known as "carbonated hardness" is equal or less than the alkalinity. Permanent hardness can cause boiler or pipe scale and failure of reverse osmosis membranes. |
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| Harvesting | The separation of cells from growth media. It can be accomplished by filtration, precipitation, or centrifugation. |
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| Hazardous Chemical Reaction | A reaction which generates pressure or byproducts which could cause injury, illness or harm to humans, domestic animals, livestock or wildlife. |
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| Hazardous Occupancy - Group H - (Califor | Group H occupancies include buildings or structures, or portions thereof, that involve the manufacturing, processing, generation or storage of materials that constitute a high fire, explosion, or health hazard. There are eight divisions in this Group: - 1. Division 1 - Occupancies with a quantity of material in the building exceeding regulation set limits and that present a high explosion hazard, such as blasting agents, fireworks, black powder, certain oxidizers and detonatable unstable (reactive) materials, and other materials (refer to Code for more details).
- 2. Division 2 - Occupancies where combustible dust is manufactured, used, or generated in such a manner that concentrations and conditions creates fire or explosion potential, or occupancies where materials exceeding regulation set limits present a moderate explosion hazard or a hazard from accelerated burning, such as some organic peroxides, pyrophoric gases, flammable or oxidizing gases, some nondetonatable unstable (reactive) materials, and other materials (refer to Code for more details).
- 3. Division 3 - Occupancies where flammable solids, other than combustible dust, are manufactured, used or generated, or occupancies where materials exceeding regulation set limits present a high physical hazard, such as some organic peroxides and oxidizers, pyrophoric liquids or solids, flammable solids in storage, flammable or oxidizing cryogenic fluids, and other materials (refer to Code for more details).
- 4. Division 4 - Repair garages not classified as Group S, Division 3 Occupancies.
- 5. Division 5 - Aircraft repair hangars not classified as Group S, Division 5 Occupancies, and heliports.
- 6. Division 6 - Semiconductor fabrication facilities and comparable research and development areas in which hazardous production materials (HPM) are used and the aggregate quantity of materials exceeds those set by regulations. Such facilities and areas shall be designed and constructed following a different set of regulations.
- 7. Division 7 - Occupancies having quantities of materials in excess of those set by regulations, and that are health hazards, such as corrosives (except stationary lead-acid battery systems), toxic and highly toxic materials, irritants, sensitizers, and other health hazards (refer to Code).
- 8. Division 8 - Laboratories and similar areas used for scientific experimentation or research having quantities of materials not in excess of those set by regulations, and not otherwise classified as Group B, Division 2 Occupancies (refer to Code for more details).
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| Hazardous Substance | A substance which by reason of being explosive, flammable, toxic, poisonous, corrosive, oxidizing, irritant or otherwise harmful, is likely to cause injury. |
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| Haze | The abnormal appearance of a localized diminishing in brightness or luster of a surface when compared to the adjacent surfaces. |
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| Health Hazard | Classification of a chemical for which there is statistically significant evidence based on at least one study conducted in accordance with established scientific principles that acute or chronic health effects may occur in exposed persons. The term "health hazard" includes chemicals that are carcinogens, toxic or highly toxic agents, reproductive toxins, irritants, corrosives, sensitizers, hepatotoxins, nephrotoxins, neurotoxins, agents that act on the hematopoietic system, and agents that damage the lungs, skin, eyes or mucous membranes. |
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| Heat | A form of energy associated with the motion of atoms or molecules in solids and capable of being transmitted through solid and fluid media by conduction, through fluid media by convection, and through empty space by radiation. Two important characteristics of heat are: - 1. Heat cannot be destroyed, only transferred from on body to another, or converted to another form of energy.
- 2. Heat always flows from the warmer to the colder substance.
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| Heat Affected Zone (HAZ) | That portion of the base metal that has not been melted but whose microstructure or mechanical properties have been altered by the heat of welding, brazing, soldering, forming, or cutting. |
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| Heat Labile | Able to be destroyed or altered by high temperature. Heat labile pharmaceuticals are sterilized by filtration. |
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| Heat Number | An alphanumeric identification of a stated tonnage of metal obtained from a continuous melting in a foundry furnace. |
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| Heat of Vaporization | The amount of heat needed to change a unit volume from a liquid to a vapor at a given pressure without a temperature change. |
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| Heavy Metals | High molecular weight metal ions, such as lead. Known for their interference with many processes, and "poisoning" of catalysts, membranes, and resins. |
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| HeLa Cells | An established line of human cervical carcinoma cells used to study the biochemistry and genetics of human cell growth. |
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Glossary V2.0 |
