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| Terms for subject Environment (6310 entries) |
| hloretilēns | chloroethylene (A flammable, explosive gas with an ethereal aroma; soluble in alcohol and ether, slightly soluble in water; boils at -14° C; an important monomer for polyvinyl chloride and its copolymers; used in organic synthesis and in adhesives) | |
| hlorēts ogļūdeņradis | 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) | |
| hlorfluorogļūdeņradis | chlorofluorocarbon (Gases formed of chlorine, fluorine, and carbon whose molecules normally do not react with other substances; they are therefore used as spray can propellants because they do not alter the material being sprayed) | |
| hlorfluorogļūdeņražu un halonu aizliegums | CFC and halons prohibition (An interdiction on the manufacture or use of products that discharge chlorofluorocarbons and bromine-containing compounds into the atmosphere, thereby contributing to the depletion of the ozone layer) | |
| hlorīds | chloride (A compound which is derived from hydrochloric acid and contains the chlorine atom in the -1 oxidation state) | |
| hlorofenols | chlorophenol (Major group of chlorinated hydrocarbons, pesticides and biocides which account for a very high percentage of the non-agricultural pesticide use, such as anti-rotting agents in non-woollen textiles and wood preservatives. The chlorophenols act as biocides by inhibiting the respiration and energy-conversion processes of the microorganisms. They are toxic to man above 40 parts per million, to fish above 1 ppm, whilst concentrations as low as one part per thousand million can taint water) | |
| hlorofils | chlorophyll (A green pigment, present in algae and higher plants, that absorbs light energy and thus plays a vital role in photosynthesis. Except in Cyanophyta (blue-green algae), chlorophyll is confined to chloroplasts. There are several types of chlorophyll, but all contain magnesium and iron. Some plants (e.g., brown algae, red algae, copper beech trees) contain additional pigments that masks the green of their chlorophyll) | |
| hloroze | chlorosis (A disease condition of green plants seen as yellowing of green parts of the plants) | |
| hlors | chlorine (A very reactive and highly toxic green, gaseous element, belonging to the halogen family of substances. It is one of the most widespread elements, as it occurs naturally in sea-water, salt lakes and underground deposits, but usually occurs in a safe form as common salt (NaCl). Commercially it is used in large quantities by the chemical industry both as an element to produce chlorinated organic solvents, like polychlorinated biphenyls (PCBs), and for the manufacture of polyvinyl chloride plastics, thermoplastic and hypochlorite bleaches. Chlorine was the basis for the organochlorine pesticides, like DDT and other agricultural chemicals that have killed wildlife. The reactivity of chlorine has proved disastrous for the ozone layer and has been the cause of the creation of the ozone hole, which was first detected in the Southern Hemisphere over Antarctica and then over the Northern Hemisphere) | |
| holistiska pieeja | holistic approach | |
| hordainis | chordate (The highest phylum in the animal kingdom, characterized by a notochord, nerve cord, and gill slits; includes the urochordate, lancelets and vertebrates) | |
| horoloģija | chorology (The study of the causal relations between geographical phenomena occurring within a particular region) | |
| hromatogrāfija | chromatography (A method of separating and analyzing mixtures of chemical substances by selective adsorption in a column of powder or on a strip of paper) | |
| hromatogrāfiskā analīze | chromatographic analysis (The analysis of chemical substances that are poured into a vertical glass tube containing an adsorbent where the various components of the substance move through the adsorbent at different rates of speed according to their degree of attraction to it, thereby producing bands of color at different levels of the adsorption column) | |
| hroms | chromium (A hard grey metallic element that takes a high polish, occurring principally in chromite: used in steel alloys and electroplating to increase hardness and corrosion-resistance) | |
| humanitāra krīze | humanitarian crisis | |
| humanitārā palīdzība | humanitarian aid (The support or relief given to save human lives or to alleviate suffering, including public health efforts and the provision of financial resources and food, often when governmental authorities are unable or unwilling to provide for such assistance) | |
| I (sārmains) grupas elements | element of group (Any of the monovalent metals lithium, sodium, potassium, rubidium, caesium, and francium, belonging to group 1A of the periodic table. They are all very reactive and electropositive; alkaline) | |
| I pielikumā iekļautā puse | Annex I party | |
| I pielikumā iekļautā puse | Party included in Annex I |