(n.) An oily, volatile hydrocarbon, obtained by the distillation of caoutchouc or guttaipercha.
Example Sentences:
(1) The location of the internal trans and cis isoprene units in ficaprenol-11 isolated from Ficus elastica was determined by 13C nuclear magnetic resonance.
(2) An enzymatic comparison with a variety of polyprenol substrates indicates that the solubilized kinase prefers long-chain (C90-95) polyprenols with saturated alpha-isoprene units.
(3) Analysis by mass spectrometry and by nuclear magnetic resonance showed that the molecule is formed by condensation of 10 unsaturated isoprene units and 1 saturated isoprene unit.
(4) The chemical structure of synthetic dolichol-19, which was prepared by the addition of a saturated isoprene unit to the polyprenol-18 isolated from Ginkgo biloba, was confirmed to be identical with that of pig liver dolichol-19.
(5) The number of internal trans isoprene residues in this compound was three in comparison with two such residues in long-chain C95-dolichol.
(6) It was demonstrated that C30-C80-polyprenyl phosphates with unsaturated alpha-isoprene unit were as active as natural acceptor (undecaprenyl phosphate) in this enzymic system.
(7) Hb adducts also accumulated linearly after repeated daily administration of 100 mumol [14C]butadiene or 500 mumol [14C]isoprene per kilogram body wt to mice and rats, respectively, for 3 days.
(8) The relative amount of the metabolites present in blood was highest for low concentrations of inhaled isoprene and for shorter exposure durations.
(9) Three side-chains monocarboxylic acids hydroxylated in allylic positions in the isoprene moiety were also characterized.
(10) Catalytic hydrogenolysis has been used as a means of distinguishing between classes of polyprenyl phosphate sugars which contain saturated alpha-isoprene units from those in which this grouping is allylic.
(11) Two isoprenoids with 9 to 10 isoprene chains (polyprenoids), N-(p-methylbenzyl)decaprenylamine and N-solanesyl-N,N'-bis(3,4-dimethoxybenzyl)ethylenediamine overcame the multidrug resistance almost completely in cultured Chr-24, whereas they only slightly sensitized the parental KB cells to anticancer agents.
(12) This was independent of inhaled isoprene concentration.
(13) The incorporation of radioactive farnesyl pyrophosphate and radioactive geranylnerol and the lack of incorporation of radioactive geranylgeraniol into betulaprenols-6 to -9 demonstrated that they are formed by the cis-additions of isoprene residues to all-trans-farnesyl pyrophosphate.
(14) In brain, spleen, and intestine one-third and in other tissues 10-20% of the total ubiquinone contained 10 isoprene units.
(15) The compound is thus designated MK-8(2H), indicating a menaquinone with eight isoprene units but only seven double bonds in the side chain.
(16) The isoprenoid pattern for dolichol and dolichyl-P, respectively, is modified to longer polyprenols in the two fractions as seen in the percent distribution of the individual isoprenes.
(17) Six differential observations were made: (1) Plastoquinone and ubiquinones, with a side chain of more than two isoprene units, are by far better mediators than their short-chain homologues.
(18) 14CO2 exhalation after the end of the 6-hr exposure was minimal (2%) at the 20 ppm exposure and increased up to 18% at the higher isoprene exposure concentrations.
(19) A biosynthesis of hexahydroprenols by addition of cis-isoprene units to all-trans-geranylgeranyl pyrophosphate, or a dihydro or tetrahydro derivative thereof, is suggested.
(20) A method for the determination of neophytadiene in the total particulate matter of cigarette smoke was developed and applied to test its relationship to isoprene deliveries.
Rubber
Definition:
(n.) India rubber; caoutchouc.
(n.) An overshoe made of India rubber.
(n.) One who, or that which, rubs.
(n.) An instrument or thing used in rubbing, polishing, or cleaning.
(n.) A coarse file, or the rough part of a file.
(n.) A whetstone; a rubstone.
(n.) An eraser, usually made of caoutchouc.
(n.) The cushion of an electrical machine.
(n.) One who performs massage, especially in a Turkish bath.
(n.) Something that chafes or annoys; hence, something that grates on the feelings; a sarcasm; a rub.
(n.) In some games, as whist, the odd game, as the third or the fifth, when there is a tie between the players; as, to play the rubber; also, a contest determined by the winning of two out of three games; as, to play a rubber of whist.
Example Sentences:
(1) It became fully operational in 1975, replacing its predecessor the rubber bullet.
(2) We describe an enzymatic fluorometric method for determining glucose concentrations in blood samples by analysis on a semi-solid surface (silicone-rubber pads).
(3) Hopes of a breakthrough are slim, though, after WTO members failed to agree a draft deal to rubber-stamp this week.
(4) Dynamics in the changes was established among the workers from the production of "Synthetic rubber and latex", associated with the duration of occupational exposure to styrene and divinyl.
(5) A rubber cuff was fixed on the metal cylinder and let an opening of 8 cm, simulating the cervix uteri.
(6) There were 45 deaths from lung cancer among curing workers compared to 24.6 expected based on the age- and calendar period-specific rates of other rubber workers.
(7) A preparation in a special triple bath was drawn through two rubber membranes dividing the strip into three segments.
(8) Porous polyethylene was thus better incorporated into the soft tissues than silicone rubber as long as the overlying soft tissues were not stressed by an oversized implant or inadequate soft tissue coverage.
(9) Neither pH nor composition of liner collection cone had an effect on postthaw acrosomal scores, but the time required for a 50% increase in severely damaged acrosomes was greater for spermatozoa collected in polyethylene than in rubber liner collection cones.
(10) Mice were exposed to hypoxia by enclosure in cages covered with dimethyl-silicone rubber membranes for 1-14 days.
(11) Two types are present, a crystalline (clear) form and a white, opaque form with pigmentation resulting from a diene rubber.
(12) Another man who is not moving fast enough is shot with a rubber bullet.
(13) "There is no debate over the conclusion that Abir was injured by a rubber bullet shot by border guards, which in turn leads to the conclusion that the shooting of Abir occurred out of negligence, or in violation of the rules of engagement," said Judge Orit Efal-Gabai.
(14) Mortality and morbidity from cancer among a cohort of 13,570 white male rubber workers were examined.
(15) An air chamber attached to a Hg-manometer has in an upper wall a round window 8 mm in diameter, closed by a 0.05 mm-thick rubber membrane.
(16) It consisted of a conventional precordial or esophageal probe connected to a microphone by a rubber adapter.
(17) He explains that the violence began after the demo overran its official cut-off time: Violence flared on Tuesday in the centre of Madrid as baton-wielding police charged crowds and fired rubber bullets at demonstrators who had tried to surround the country's parliament building.
(18) The angiomas of the skin may occur in 3 forms: large cavernous angiomas; blood sac looking like a blue rubber nipple, they can be emptied; irregular blue mark, sometimes with puncted blackish spots, they may not blanch on pressure.
(19) Linear distortion of the mercaptan (polysulfide) rubber base that takes place during setting is a cause of this problem.
(20) Herein we report a case occurring as pustulosis palmaris, that has been identified as an occupational allergic contact dermatitis to black rubber.