(n.) Any one of the three metameric hydrocarbons, C5H12, of the methane or paraffin series. They are colorless, volatile liquids, two of which occur in petroleum. So called because of the five carbon atoms in the molecule.
Example Sentences:
(1) Breath was passed through a cooled loop of alumina to adsorb, concentrate, and release, on heating, pentane.
(2) The target concentrations for the butane:pentane mixtures were 4500 and 1000 parts per million (ppm), while 5200 and 1200 ppm were set for the gasoline distillation fraction.
(3) Infants receiving total parenteral nutrition including intravenous lipid emulsion excrete more than 100 pmol of pentane per kilogram body weight per minute.
(4) Extractions by the Twisselmann method give increasing yields in the order n-pentane, hexane, and n-heptane.
(5) The second group of solvents, including toluene and chloroform, showed only a destabilizing effect, while the third group of solvents such as formamide and pentane had no effect over a wide range of concentrations.
(6) The effects of oxygen on production of pentane and compounds absorbing at 234 nm and 285 nm by soybean lipoxygenase isozymes I and II were examined in a model system.
(7) Experiments using purified fatty acids revealed that ethane was preferentially produced from docosahexaenoic and linolenic, and pentane from linoleic and arachidonic acids.
(8) Evidence is produced that destruction of the visual receptor cells by iodoacetate or 1,5-di(p-aminophenoxy) pentane dihydrochloride effectively silences the optic nerve discharge and so achieves this result.2.
(9) Phosphatidylcholine hydroperoxide produced a fluorescent substance (FS-III) through reaction with 1-amino-pentane after preincubation with heme methyl ester as a model system.
(10) The signal is strongly dependent on temperature and can only be well resolved at less than 20 degrees K. It is readily elicited in submitochondrial particles by partial reduction, but has not been observed in submitochondrial particles from which ubiquinone has been removed by pentane extraction.
(11) Pentane extraction of the drug and the internal standard and formation of the N-pentafluorobenzoyl derivatives were followed by GLC.
(12) In oocytes, hybrid-selected human brain mRNA induced acetylcholinesterase activity that was completely inhibited by 1,5-bis[4-allyldimethylammonium)phenyl]pentan-3-one dibromide but not by tetraisopropyl pyrophosphamide, a differential response to these inhibitors characteristic of "true" human brain acetylcholinesterase.
(13) Following hypophysectomy there could be observed a certain decline in the anabolic activity of 1,5-bis(1-carbethoxy-2-oxocyclopentyl-1)pentane.
(14) In order to assess whether multiple sclerosis is associated with lipid peroxidation, we measured pentane and ethane excretion by 16 patients with multiple sclerosis and compared them to healthy control subjects.
(15) The fraction of pentane cyclizations of its hydrocarbon chains increases with the growth temperature of the source organism (39-59 degrees C).
(16) Here, 1-(4-amidino-2-iodophenoxy)-5-(3-amidinophenoxy)pentane (compound 32) was a highly effective inhibitor of bovine thrombin (Ki = 1.1 x 10(-6) M), of human thrombin, and of the overall clotting process of human plasma.
(17) The major hydrocarbon gas products in iron, copper, or hematin catalyzed peroxidation systems were ethane or ethylene from linolenic acid, and pentane from linoleic acid and arachidonic acid.
(18) Lung homogenates from animals treated with alpha-tocopherol had decreased concentrations of TBA reactants and pentane production after incubation with either oxidant stress compared to lung homogenate from animals treated with alpha-tocopheryl acetate or vehicle alone.
(19) We conclude that pentane is a good index of in vitro lipid peroxidation via microsomal NADPH-P-450 enzyme systems.
(20) In schizophrenic patients, the course of lipid peroxidation (LP) was investigated as indicated by pentane contents in the expired air (gas chromatography) during a course of psychotropic drug therapy.
Volatile
Definition:
(a.) Passing through the air on wings, or by the buoyant force of the atmosphere; flying; having the power to fly.
(a.) Capable of wasting away, or of easily passing into the aeriform state; subject to evaporation.
(a.) Fig.: Light-hearted; easily affected by circumstances; airy; lively; hence, changeable; fickle; as, a volatile temper.
(n.) A winged animal; wild fowl; game.
Example Sentences:
(1) No correlation between volatile make up and geography was found, but the profiling procedures are shown to be of use in the forensic problem of relating samples to a common source.
(2) Glucose, osmotic pressure, packed cell volume, PFC by combustion and volatilization were also measured in blood samples.
(3) Less volatile amino acids such as aspartic acid, phenylalanine, methionine, glutamic acid, tyrosine, arginine, and tryptophan can be resolved at a 100 ft x 0.02 in column.
(4) These results indicate that all three volatile anesthetics have direct effects on cardiac calcium channels, and that the magnitude of the effects depends on their anesthetic potencies.
(5) Business picked up in the fourth quarter of 2013 but the consumer goods giant said those markets had continued to slow and it expected "ongoing volatility in the external environment".
(6) George Osborne became the first British minister to visit the volatile Chinese region of Xinjiang on Wednesday amid reports that 40 people had been injured or killed in the latest episode of deadly violence to hit the country’s far west.
(7) A total of 194 beers (148 US and 46 Canadian) were analysed for volatile N-nitrosamines.
(8) Rumen pH decrease to below 5.0 in S2-, lasalocid-, and monensin-treated cattle was not due to lactic acid, but to increased production of volatile fatty acids.
(9) The microflora in strained rumen fluid did not methylate or volatilize 203Hg2+ at detectable rates.
(10) Protein-bound acyl groups were labilized by performic acid treatment indicating their attachment to protein at thiol residues; however, the product released was volatile, which is not characteristic of malonic acid.
(11) In an experiment with wethers we investigated the effect of complete pelleted feed ration on the concentration of volatile fatty acids in the rumen and intestinal tract.
(12) This was possible because the Ara test, for volatile compounds (such as vinyl bromide), did not require the use of special vaporization techniques, which are difficult to evaluate quantitatively for mutagenic activity.
(13) Furthermore, volatile sulfide and 2-ketobutyrate productions from methionine in a saliva putrefaction system were completely inhibited by the two-phase mouthwash; and consumption of methionine was decreased by 65 percent.
(14) Uncertainty over ‘Brexit’, weak overseas growth and financial market volatility are all creating an unsettling business environment and point to downside risks to the economy in 2016.” The official figures follow mixed reports on the economy in recent weeks.
(15) The volatilization of DBCP from soils, as affected by the soil characteristics and application techniques, was studied in a laboratory experiment.
(16) Further studies are needed to determine the identity and toxicological properties of the non-volatile N-nitroso compounds.
(17) The longer the international standoff over Iran’s suspect nuclear programme continues, the more dangerous and volatile the situation becomes.
(18) The N supplements had no significant effects on rumen pH, concentrations of volatile fatty acids, their molar proportions or the disappearance of DM or N from porous synthetic-fibre bags.
(19) Effects of noxious electrical tooth stimulations and intraarterial administration of bradykinin or inhalation of volatile anesthetics on substance P content in the diencephalon-mesencephalon, pons-medulla and the spinal cord were examined in the rat.
(20) The efficiency of the volatilization of heroin using this procedure was studied under laboratory conditions using thin layer chromatography, gas chromatography and high pressure liquid chromatography.