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| Terms for subject Environment (6532 entries) |
| hidraulică agricolă | agricultural hydraulics (Science and technology involved in the management of water resources, in the control of erosion and in the removal of unwanted water) | |
| hidrobiologie | hydrobiology (Study of organisms living in water) | |
| hidrocarbură | hydrocarbon (A very large group of chemical compounds composed only of carbon and hydrogen) | |
| hidrocarbură aliciclică | alicyclic hydrocarbon (A class of organic compounds containing only carbon and hydrogen atoms joined to form one or more rings and having the properties of both aliphatic and cyclic substances) | |
| hidrocarbură alifatică | aliphatic hydrocarbon (Hydrocarbons having an open chain of carbon atoms, whether normal or forked, saturated or unsaturated) | |
| hidrocarbură aromatică | aromatic hydrocarbon (Hydrocarbons having an unsaturated ring containing alternating double and single bonds, especially containing a benzene ring) | |
| hidrocarbură aromatică policiclică | polycyclic aromatic hydrocarbon (Hydrocarbons containing two or more closed rings of atoms) | |
| hidrocarbură clorurată | chlorinated hydrocarbon (A class of persistent, broad-spectrum insecticides that linger in the environment and accumulate in the food chain. Among them are DDT, aldrin, dieldrin, heptachlor, chlordane, lindane, endrin, mirex, hexachloride, and toxaphene. In insects and other animals these compounds act primarily on the central nervous system. They also become concentrated in the fats of organisms and thus tend to produce fatty infiltration of the heart and fatty degeneration of the liver in vertebrates. In fishes they have the effect of preventing oxygen uptake, causing suffocation. They are also known to slow the rate of photosynthesis in plants. Their danger to the ecosystem resides in their rate stability and the fact that they are broad-spectrum poisons which are very mobile because of their propensity to stick to dust particles and evaporate with water into the atmosphere) | |
| hidrocarbură halogenată | halogenated hydrocarbon (One of a group of halogen derivatives of organic hydrogen and carbon containing compounds; the group includes monohalogen compounds (alkyl or aryl halides) and polyhalogen compounds that contain the same or different halogen atoms) | |
| hidrocarbură policiclică | polycyclic hydrocarbon (Hydrocarbon molecule with two or more nuclei; examples are naphtalene, with two benzene rings side by side, or diphenyl, with two bond-connected benzene rings. Also known as polynuclear hydrocarbon) | |
| hidrocultură | hydroculture (Growing plants without soil but in sand or vermiculite or other granular material, using a liquid solution of nutrients to feed them) | |
| hidrofluorocarbură | fluorinated hydrocarbon | |
| hidrofluorocarbură | fluorohydrocarbon | |
| hidrofluorocarbură | hydrofluorocarbon | |
| hidrogen | hydrogen (A flammable colourless gas that is the lightest and most abundant element in the universe. It occurs mainly in water and in most organic compounds and is used in the production of ammonia and other chemicals, in the hydrogenation of fats and oils, and in welding) | |
| hidrogen sulfurat | hydrogen sulphide (Flammable, poisonous gas with characteristic odour of rotten eggs, perceptible in air in a dilution of 0.002 mg/l. It is used as a reagent in chemical analysis; extremely hazardous; collapse, coma and death from respiratory failure may come within a few seconds after one or two inspirations; low concentrations produce irritation of conjunctiva and mucous membranes. Headache, dizziness, nausea, lassitude may appear after exposure, H2S) | |
| hidrogeologie | hydrogeology (The science dealing with the occurrence of surface and ground water, its utilization, and its functions in modifying the earth, primarily by erosion and deposition) | |
| hidrografie | hydrography (Science which deals with the measurement and description of the physical features of the oceans, lakes, rivers, and their adjoining coastal areas, with particular reference to their control and utilization) | |
| hidroliză | hydrolysis (1. Decomposition or alteration of a chemical substance by water. 2. In aqueous solutions of electrolytes, the reactions of cations with water to produce a weak base or of anions to produce a weak acid) | |
| hidrologie | hydrology (The science that treats the occurrence, circulation, distribution, and properties of the waters of the earth, and their reaction with the environment) |