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1.
P. C. Srivastava K. L. Nagpal M. M. Dhar 《Cellular and molecular life sciences : CMLS》1969,25(4):356-357
Zusammenfassung Uridylyl-(3–5)-adenosin und Uridylyl-(3-5)-ionosin wurden durch Umsetzung eines passenden 5-chloro-5-deoxy-2, 3-O-isopropylidene-Nukleosids mit Uridin-3-phosphat synthetisiert. 相似文献
2.
Summary During the development of anthers inTulipa cv. Apeldoorn the following chalcones were isolated: 2, 3, 4, 4, 6-pentahydroxychalcone as the main component and 2, 4, 4, 6-tetrahydroxy-3-methoxychalcone as well as 2, 4, 4, 6-tetrahydroxychalcone in a very small amount.
Die Untersuchungen wurden mit Mitteln der Deutschen Forschungsgemeinschaft unterstützt. 相似文献
Die Untersuchungen wurden mit Mitteln der Deutschen Forschungsgemeinschaft unterstützt. 相似文献
3.
M. Tiecco M. Tingoli L. Testaferri D. Chianelli E. Wenkert 《Cellular and molecular life sciences : CMLS》1987,43(4):462-463
Summary The 3,3,4,4-tetrahydroxy-2,2-bipyridyl-N-oxide has been synthesized by dealkylation of the corresponding tetramethyl derivative. The chemical properties of this compound are identical to those reported for the minor fungal toxin ofCortinarius orellanus, orellinine.This work is part of the Tesi di Laurea of Miss Cinzia Pierucci. 相似文献
4.
P. C. Srivastava K. L. Nagpal M. M. Dhar 《Cellular and molecular life sciences : CMLS》1968,24(7):657-657
Zusammenfassung Die Behandlung von 8-5-Anhydro-8-mercapto-2-o-mesylguanosin mit (1,2 Äquivalent) Tributylammonium-uridylat in siedendem DMF lieferte das Dinucleosidphosphat Uridyl-(3-5)-8-mercapto-2-o-mesylguanosin. Weitere Behandlung mit Raney Ni führte zum Uridyl-(3-5)-2-o-mesylguanosin. 相似文献
5.
Zusammenfassung Axillarin (5, 7, 3, 4-Tetrahydroxy-3,6-dimethoxyflavon). 5,3,4-Trihydroxy-3,6,7-trimethoxyflavon und 5,7,3,4-Tetrahydroxy-3,8-dimethoxyflavon wurden synthetisiert. 相似文献
6.
Die Induktion lysogener Bakterien durch Nitrosamide 总被引:1,自引:0,他引:1
Summary N, N-dinitroso-N, N-dimethyloxamide and N, N-dinitroso-N, N-dimethylterephtal acid amide, both mutagenic for yeast cells, induce phage production by lysogenicEscherichia coli K12 () cells. 相似文献
7.
U. Kerb H. -D. Berndt U. Eder R. Wiechert P. Buchschacher A. Furlenmeier A. Fürst M. Müller 《Cellular and molecular life sciences : CMLS》1971,27(7):759-761
Summary The synthesis of 3-acetoxy-16, 20-dihydroxy-4-methyl-18-nor-5, 14-pregnano[13,14-f]hexahydro-1, 4-oxazepin-3-one (20a) is described. 相似文献
8.
P. Gandhi 《Cellular and molecular life sciences : CMLS》1978,34(1):15-15
Summary Incubation of 5,5-7,7-tetramethoxy-8,8-biflavone withAspergillus niger results in the formation of 4,4-dihydroxy-5,5-7,7-tetramethoxy-8,8-biflavan.Part of this work was done at Allahabad University, Chemical Laboratories. 相似文献
9.
Zusammenfassung Die Synthese von 7-Hydroxy-5,6-dimethoxybenzofurano[3,2:3,4]coumarin aus 7,2-Dihydroxy-oder 7-Benzyloxy-2-hydroxy-4,5-dimethoxyisoflavon wird beschrieben. 相似文献
10.
Zusammenfassung Ein einfacher Weg zur selektiven Esterbildung mit der 5-Hydroxylgruppe von Thymidin wird beschrieben. Beispiele: Thymidin-5-phosphat, Thymidin-5-sulfat und Thymidin-5-trichloracetat. 相似文献
11.
K. Fukui T. Matsumoto S. Nakamura M. Nakayama T. Horie 《Cellular and molecular life sciences : CMLS》1968,24(2):108-109
Zusammenfassung Durch Kondensation nachAllan-Robinson wurde aus 2,4,6-Trihydroxy-3, -dimethoxy-acetophenon das 4-Benzyloxy-5,7-dihydroxy-3,6,3-trimethoxyflavon dargestellt. Entbenzylierung in C-4-Stellung führte zum 5,7,4-Trihydroxy-3,6,3-trimethoxyflavon. Die Eigenschaften dieser Verbindung und ihre Derivate sind identisch mit dem ausCentaurea jacea L. isolierten Jaceidin bzw. seinen Derivaten. 相似文献
12.
R. R. Scheline 《Cellular and molecular life sciences : CMLS》1974,30(8):880-881
Zusammenfassung Nach Eingabe vontrans-Stilben bei Ratten wurden die grössten Mengen im Harn als 3,4,4-Trihydroxystilben, 3,4,4-Trihydroxybibenzyl und 3,3, 4,4-Tetrahydroxybibenzyl nachgewiesen. Die Bibenzylderivate werden nachscheinlich nach Ausscheidung in der Galle von Darmbakterien metabolisiert. 相似文献
13.
Summary 2,4,4,6-Tetrahydroxychalcone-2-glucoside-[-14C] is incorporated into biochanin-A in chana germ (Cicer arietinum L.) without randomization of the radioactivity. Possibly a very low incorporation into formononetin occurs also. After administration of the chalcone a large part of the activity is bound to the acid insoluble residue of the cicer shoots (lignin-like substances) in an (as yet) undetermined manner. This binding also occurs in heat denatured homogenates.
VI. Mitt. Zur Biogenese der Isoflavone. V. Mitt.H. Grisebach undG. Brandner, Biochim. biophys. Acta60, 51 (1962). 相似文献
VI. Mitt. Zur Biogenese der Isoflavone. V. Mitt.H. Grisebach undG. Brandner, Biochim. biophys. Acta60, 51 (1962). 相似文献
14.
Summary Intensain causes in vitro a significant and apparently competitive inhibition of phosphodiesterase, which transforms the 3,5-AMP to 5-AMP. These results explain some intensain effects, especially the period of latency to reach the maximum effect, the inotropic action and its reaction under the influence of-blocking and-stimulating agents10–13.
3-(-Diäthylamino-äthyl)-4-methyl-7-carbäthoxy-methoxy-2-oxo-(1,2-chromen), Carbochromen. 相似文献
3-(-Diäthylamino-äthyl)-4-methyl-7-carbäthoxy-methoxy-2-oxo-(1,2-chromen), Carbochromen. 相似文献
15.
S. Tsukamoto H. Hirota H. Kato N. Fusetani 《Cellular and molecular life sciences : CMLS》1994,50(7):680-683
Two pteridine-containing bromophysostigmine alkaloids, urochordamine A and B, which were isolated from ascidians as larval metamorphosis promoters, were converted to more polar compounds, urochordamine A and B, respectively, when left standing in protic solvents. These four compounds promoted larval metamorphosis of the ascidianHalocynthia roretzi in the order A>A>B>B, and induced metamorphosis of the pediveliger larvae of the musselMytilus edulis galloprovincialis. 相似文献
16.
Hotspots of homologous recombination 总被引:9,自引:0,他引:9
G. R. Smith 《Cellular and molecular life sciences : CMLS》1994,50(3):234-241
Homologous recombination occurs at higher than average frequency at and near hotspots. Hotspots are special nucleotide sequences recognized by proteins that promote, directly or indirectly, a rate limiting step of recombination. This review focuses on two well-studied examples, the Chi sites of the bacteriumEscherichia coli and the M26 site of the fission yeastSchizosaccharomyces pombe. Chi, 5 G-C-T-G-G-T-G-G 3, is recognized by the RecBCD enzyme, which nicks the DNA near Chi and produces a 3-ended single-stranded DNA tail; this tail is a potent substrate for homologous pairing by RecA and single-stranded DNA binding proteins. M26, 5 A-T-G-A-C-G-T 3, is recognized by a heterodimeric protein and stimulates, by an as-yet-unknown mechanism, meiotic recombination at and near theade6 gene. Additional hotspots in bacteria, fungi, and mammals enhance recombination directly or indirectly via a variety of mechanisms. Although hotspots are widespread among organisms, the biological role of their localized enhancement of recombination remains a matter of speculation. 相似文献
17.
Correlation between 3′,5′, c-AMP levels and thyrotropin in separated rat pituitary thyrotropic cells
Summary The correlation between 3,5, c-AMP levels, TSH content and secretion of separated thyrotropic cells was studied. Incubation of the separated cells with 1, 10 and 100 ng of TRH does not change the 3,5, c-AMP levels, despite the significant rises of the TSH level. Dibutyryl c-AMP causes rise in TSH content, with no indication of its secretion. PGE2 10–5 increased 3, 5, c-AMP levels with no change in the content or secretion of TSH in separated thyrotropic cells. 相似文献
18.
J. Reisch K. Szendrei E. Minker und I. Novák 《Cellular and molecular life sciences : CMLS》1968,24(10):992
Summary A new coumarin-derivative has been isolated from the roots ofRuta graveolens. It could be identified by UV-, IR-, NMR- and mass-spectrometry as 3-(1,1-dimethylallyl)-6-(3,3-dimethylallyl)-umbelliferone, which was called gravelliferone. It represents a new type of 3-substituted coumarins. 相似文献
19.
A. Brossi M. Uskoković J. Gutzwiller Antoniana U. Krettli Z. Brener 《Cellular and molecular life sciences : CMLS》1973,29(3):367-368
Zusammenfassung Ein Vergleich dieser Resultate mit denjenigen, die wir für (±)-Dihydrochinin und (±)-Dihydrochinidin berichtet haben2, bestätigt die Ergebnisse anderer Arbeiten4, dass Inversion am C-3 nur eine geringe Abnahme der Aktivität zur Folge hat. Die folgenden Aktivitäten gegenPlasmodium berghei in Mäusen2 wurden in abnehmender Ordnung festgestellt: Dihydrochinidin>Dihydrochinin3-Epidihydrochinidin>3-Epidihydrochinin. Die Ersetzung der 6-Methoxygruppe mit einer 6, 7-Methylendioxy- oder 7-Chlorgruppe ist eine wirksame Abwandlung; die 7-Chlorderivate scheinen bisher die wirksamsten Verbindungen sowohl in der 3-Epials auch in dernormalen Serie zu sein2. 相似文献
20.
W. E. G. Müller 《Cellular and molecular life sciences : CMLS》1976,32(12):1572-1573
Summary 1--d-arabinofuranosylcytosine-5-triphosphate and 9--d-arabinofuranosyladenosine-5-triphosphate were found to have no inhibitory potency for both mammalian DNA-dependent RNA polymerase II andE. coli DNA-dependent RNA polymerase. 相似文献