(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.
Humin
Definition:
(n.) A bitter, brownish yellow, amorphous substance, extracted from vegetable mold, and also produced by the action of acids on certain sugars and carbohydrates; -- called also humic acid, ulmin, gein, ulmic or geic acid, etc.
Example Sentences:
(1) Within the years, a variability of the pure humin substances could be detected, depending on the rotation of crops and C-content.
(2) The cranial segment of the uterus forms a balloon-like enlargement at the time of implantation, and the antimesometrial part of its huminal slit expands into a spacious implantation chamber.
(3) All results may be distrubed by humin-and non-humin substances and any metabolism of microorganisms, which of course is especially noticable in damp humas soil.