(a.) Pertaining to, or derived from, vegetable mold; as, humic acid. See Humin.
Example Sentences:
(1) Humic acids derive from a class of natural substances in humic substances.
(2) Humic substances, the dark-colored, natural organic polyelectrolytes that are found in practically all soils, sediments, and natural water, strongly interact with both inorganic and organic pollutants.
(3) The hydrolytic products of lignins, humic acids and industrial waste including hydroquinone, catechol, resorcinol, pyrogallol and 1,2,4-benzenetriol are widely distributed in water sources.
(4) Samples of humic acids with M(W) approximately 18,000 have been used in experiments.
(5) As regards Ames mutagenic compounds, however, chlorination of naturally occurring humic substances during the chlorine disinfection step in drinking water production, proved to be a far more important source.
(6) At 2, 6, 12 and 20 months, humic substances were extracted from samples with 0.1 M Na2P4O7 and 0.1 M NaOH, and humic acids isolated by precipitation after acidification with HCl.
(7) Typical monomeric components of humic acids had no desmutagenic effect.
(8) Isolated humic acids from offshore sediments from the North Adriatic (Lim channel, near Rovinj, Yugoslavia) were characterized according to their elementary composition, the amount of products of hydrolysis, and the trace elements bound.
(9) In the first step the interfering substances such as sulfide and humic acid substances are removed by precipitation with copper.
(10) The results of an investigation of the influence of microorgansims of the genus Nocardia on changes in the composition and properties of humic acids are presented.
(11) A recently developed membrane model of the structure of humic substances is described; this model enables one to better understand the physical-chemical properties of these materials.
(12) Naturally occurring humic substances are particular chemical compounds which are found in humus.
(13) Humic acids have qualities such as ion-exchange materials, form hydrogen bondes and are able to form salts and complexes.
(14) A number of chlorinated organic compounds, including several known mutagens, have been identified and quantified in diethyl ether extracts of chlorinated humic acid solutions.
(15) The interaction between humic substances and a strong base anion exchange resin has been studied and the results are used for characterization of the humic substances.
(16) The bioaccumulation of benzo[a]pyrene (BaP) into Daphnia magna from two natural humic waters (one lake water and one bog water), and two humus preparations (Nordic Reference fulvic acid (Nordic FA) and a lyophilized concentrate) of the same aquatic origin was measured by using several dissolved organic carbon (DOC) concentrations for each sample.
(17) Selenate was found to be slowly reduced to selenite by humic acid in acidic solution.
(18) These electrostatic interrelationships among river sand, humic acid, and bacterial cells are closely implicated in the mechanism of long-term survival of virulent A. salmonicida in river sediments.
(19) The presence of humic acids significantly reduced loss of culturability but only in low salinity conditions.
(20) Formation of humic-like substances started in the bacterial cells and was accompanied by the presence of phenyloxidases in the bacterial cultures.
Humus
Definition:
(n.) That portion of the soil formed by the decomposition of animal or vegetable matter. It is a valuable constituent of soils.
Example Sentences:
(1) Removal of humus by anionic exchange is a potential process for small waterworks in Norway.
(2) The partition coefficient (Kp) of BaP to the humus content of the water was determined by an equilibrium dialysis technique.
(3) The humus synthesis processes were most active in the wheat and lucerne plots, they were less effective in the fallow and virgin soils.
(4) Naturally occurring humic substances are particular chemical compounds which are found in humus.
(5) The bioaccumulation of benzo[a]pyrene (BaP) into Daphnia magna from two natural humic waters (one lake water and one bog water), and two humus preparations (Nordic Reference fulvic acid (Nordic FA) and a lyophilized concentrate) of the same aquatic origin was measured by using several dissolved organic carbon (DOC) concentrations for each sample.
(6) The application of humus had a positive effect on grain and straw yield of paddy and the yield increased with the increasing concentration of humus.
(7) When bacterial cells were counted daily in humus-gleisolic soil, their number did not depend on time if the soil was incubated for five days.
(8) At present such a custom is very rare owing the chemical pollution of sewage continuously increasing; but in some countries it is still in use, and is our opinion and experience that organic waste material must be reused as fertilizer of land, more and more devoid of humus and subject to erosion of winds and waters.
(9) "Organic" or "organically grown" foods are commonly represented as "food grown without pesticides; grown without artificial fertilizers; grown in soil whose humus content is increased by the additions of organic matter; grown in soil whose mineral content is increased with applications of natural mineral fertilizers; has not been treated with preservatives, hormones, antibiotics etc."
(10) As pH is decreasing, the physical and chemical properties of humus change.
(11) Four PAH compounds, fluorene, anthracene, fluoranthene and benzo(a)pyrene were dissolved in humus poor (lake) and humus rich water.
(12) The rate of biological nitrogen fixation was determined by the acetylene technique in soils and on the roots of orange, mandarin and lemon trees growing in red, yellow, podzolic, alluvial brown forest, and humus-calcareous soils.
(13) In all four samples, an increase in humus concentration decreased the bioavailability of BaP in a logarithmic manner.
(14) His deep commitment to the freedom of the human spirit is reflected in his actions as well as artistic creations.” • This article was amended on 8 September 2016 to clarify that Eno’s music was replaced; the dance piece Humus was not withdrawn entirely.
(15) Chlorinated fluorene, fluoranthene and benzo(a)pyrene were formed during chlorination of PAH polluted lake water, but not during chlorination of the humus rich water samples.
(16) In soils with native organic matter (humus) the rate of sulfate reduction was very low; it slightly increased with increased clay content of the soils.
(17) Root nodulation, growth and yield of gram crop were appreciably increased due to humus application.
(18) The fertilizer content and humus value of such wastes are useful for agricultural purposes, and the recycling of sewage onto the land eliminates many of our stream pollution problems.
(19) From humus obtained from Stuttgart, a bacterium was isolated with lawsone (2-hydroxy-1,4-naphthoquinone) as selective source of carbon.
(20) The maximum nitrogen fixation (48--51 kg N per hectare) was found in red and humus-calcareous soils of orange plantations.