(n.) A substance of a resinous nature, obtained from the outer bark of the common European birch (Betula alba), or from the tar prepared therefrom; -- called also birch camphor.
Example Sentences:
(1) Based on spectroscopic data and chemical transformations, the structures of the new constituents were determined as 3-epi-betulinic acid 3-O-beta-D-glucopyranoside 28-O-[alpha-L-rhamnopyranosyl(1----4)-O-beta-D-glucopyranosyl(1----6)]-b eta- D-glucopyranoside and alpha-L-rhamnopyranosyl(1----4)-O-beta-D-glucopyranosyl(1----6)-beta-D- glucopyranose.
(2) The structures of the glycosides have been determined as 28-O-[alpha-L-rhamnopyranosyl(1----4)-O-beta-D-glucopyranosyl(1----6)-be ta-D- glucopyranosides of 3 alpha-hydroxy-lup-20(29)-ene-23,28-dioic acid, 3 alpha,11 alpha- dihydroxy-lup20(29)-ene-23,28-dioic acid and 3-epi-betulinic acid by spectroscopic data and chemical transformations.
(3) In addition to 3-epi-betulinic acid, three triterpene glycosides were isolated from leaves of Schefflera octophylla.
(4) On the basis of spectrometric analysis and physico-chemical constants they were identified as oleanolic acid, betulin and beta-sitosterol-D-glucoside respectively.
(5) A new triterpene saponin was isolated from the roots of Ampelozizyphus amazonicus together with the known 3-O-beta-D-glucopyranosyl-20-O-alpha-L-rhamnopyranosyljujubogenin and the known triterpenes melaleucic acid, 3 beta,27 alpha-dihydroxylup-20(29)-en-28 beta-oic acid, betulinic acid, betulin, lupeol.
(6) The constituents responsible for this activity were identified as uvaol, ursolic acid, and betulinic acid.
(7) From spectroscopic data and chemical transformations the structure of the new constituent was determined as 3-epi-betulinic acid 3-O-sulphate 28-O-[alpha-L-rhamnopyranosyl(1----4)-O-beta-D-glucopyranosyl (1----6)]-beta-D-glucopyranoside.
(8) A phytochemical investigation of Grewia bicolor gave the following results: the petroleum ether extract afforded beta-sitosterol and beta-sitosterol- and triterpene esters, and the triterpenes lupeol and betulin.
(9) megaphyllum gave (E)-betulin-3-p-coumarate [20] and (Z)-betulin-3-p-coumarate [21], both of which appear to be novel.
(10) beta-Sitosterol, betulinic acid, ursolic acid, 2alpha-hydroxyursolic acid, 2alpha,3alpha-dihydroxyurs-12-en-28-oic acid and a new triterpene acid, jacarandic acid, were also isolated.
(11) A new acetylated bidesmosidic triterpenoid saponin has been isolated from the leaves of Schefflera octophylla and structurally elucidated as 3-epi-betulinic acid 3-O-beta-D-6'-acetylglucopyranoside 28-[alpha-L-rhamnopyranosyl(1----4)-O-beta-D-glucopyranosyl(1----6)]-bet a-D-0-glucopyranoside [1].
(12) In addition, 5 mumol betulinic acid markedly inhibited the promoting effect of 2.5 micrograms TPA applied twice weekly on skin tumor formation in mice initiated with 50 micrograms of 7,12-dimethylbenz[a]anthracene, and 5 mumol of sitosterol caused slight suppression.
Convert
Definition:
(v. t.) To cause to turn; to turn.
(v. t.) To change or turn from one state or condition to another; to alter in form, substance, or quality; to transform; to transmute; as, to convert water into ice.
(v. t.) To change or turn from one belief or course to another, as from one religion to another or from one party or sect to another.
(v. t.) To produce the spiritual change called conversion in (any one); to turn from a bad life to a good one; to change the heart and moral character of (any one) from the controlling power of sin to that of holiness.
(v. t.) To apply to any use by a diversion from the proper or intended use; to appropriate dishonestly or illegally.
(v. t.) To exchange for some specified equivalent; as, to convert goods into money.
(v. t.) To change (one proposition) into another, so that what was the subject of the first becomes the predicate of the second.
(v. t.) To turn into another language; to translate.
(v. i.) To be turned or changed in character or direction; to undergo a change, physically or morally.
(n.) A person who is converted from one opinion or practice to another; a person who is won over to, or heartily embraces, a creed, religious system, or party, in which he has not previously believed; especially, one who turns from the controlling power of sin to that of holiness, or from unbelief to Christianity.
(n.) A lay friar or brother, permitted to enter a monastery for the service of the house, but without orders, and not allowed to sing in the choir.
Example Sentences:
(1) In a debate in the House of Commons, I will ask Britain, the US and other allies to convert generalised offers of help into more practical support with greater air cover, military surveillance and helicopter back-up, to hunt down the terrorists who abducted the girls.
(2) Because cystine in medium was converted rapidly to cysteine and cysteinyl-NAC in the presence of NAC and given that cysteine has a higher affinity for uptake by EC than cystine, we conclude that the enhanced uptake of radioactivity was in the form of cysteine and at least part of the stimulatory effect of NAC on EC glutathione was due to a formation of cysteine by a mixed disulfide reaction of NAC with cystine similar to that previously reported for Chinese hamster ovarian cells (R. D. Issels et al.
(3) The small units described here could be inhibitory interneurons which convert the excitatory response of large units into inhibition.
(4) Only small amounts of 3H oleic acid were converted.
(5) Family therapists have attempted to convert the acting-out behavioral disorders into an effective state, i.e., make the family aware of their feelings of deprivation by focusing on the aggressive component.
(6) The enzyme was quantitated by incubation of 16-micron-thick brain sections with 0.07-2 nM of the converting enzyme inhibitor 125I-351A and comparison to 125I-standards.
(7) DR was not demonstrably converted to R in these studies.
(8) Combined hypertension treatment with inhibitors of the converting enzyme (ICE) and diuretocs gives manifold advantages, the most important of them is a synergistic action of both drugs resulting in blood pressure decrease and prevention of hypokaliaemia.
(9) The hemodynamic effects of captopril and other angiotensin-converting enzyme inhibitors may be mediated by the endogenous opioid system.
(10) The 1-0-methylalduronic-acidmethylesters, obtained by the methanolysis of the polysaccharides, are reduced with boronhydrid to the corresponding methyl glycosides; there are split with acid to the aldoses, which are converted in pyridine with hydroxylamine to the aldoximes and than with acetic anhydride to the aldonitrilacetates, which can be separated by gaschromatography without difficulty.
(11) Moreover, the ribosylation inhibitors converted the glucocorticoid antagonist RU-486 into a potent agonist for cytolysis of L1210 cells.
(12) Two EGZ-derived proteins were engineered in which either His98 or Glu133 amino acid was converted to an Ala residue.
(13) The rate of indole production is increased about 4-fold when the aminoacrylate produced is converted to S-(hydroxyethyl)-L-cysteine by a coupled beta-replacement reaction with beta-mercaptoethanol.
(14) Sorbitol, by itself or in combination with mannitol is slowly converted to acids by the plaque microorganisms.
(15) The fucose-labeled glycoproteins were converted to glycopeptides by pronase digestion and separated into two major classes by gel filtration on Sephadex-G-50.
(16) We conclude that systemic converting enzyme activity, assessed by in vivo measurement and correlation of PRA and AII, is not inhibited by severe hypoxia.
(17) 17-Isoaldosterone was not secreted or converted to aldosterone to any significant extent in the normal subjects investigated.
(18) Allyl 4-O-benzyl-alpha-L-rhamnopyranoside was converted into allyl 4-O-benzyl-3-O-methyl-alpha-L-rhamnopyranoside and this was condensed with 2,3,4-tri-O-acetyl-alpha-L-rhamnopyranosyl chloride to give a disaccharide derivative which was converted into allyl 4-O-benzyl-2-O-(2,3-O-isopropylidene-alpha-L-rhamnopyranosyl)-3-O-methyl -alpha- L-rhamnopyranoside.
(19) In order to increase the efficiency of androgen blockade, we have used 4-MA, an inhibitor of 5 alpha-reductase, the enzyme which converts testosterone into DHT, to reduce intracellular DHT concentrations and thus facilitate the action of the antiandrogen Flutamide.
(20) In addition, we have demonstrated that the recombinant 17-kD precursor protein can be converted to the 15-kD protein by cytoplasmic extracts of human cells.