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  • 1
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Organometallics 6 (1987), S. 2290-2293 
    ISSN: 1520-6041
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    European journal of pediatrics 119 (1975), S. 253-259 
    ISSN: 1432-1076
    Keywords: Acid glycosaminoglycans ; Aortic wall ; Newborns ; Small children ; Adults
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Intima und Media der Aorten von 13 Neugeborenen, 9 Kleinkindern (1–5 Jahre alt) und 10 älteren Erwachsenen (60–70 Jahre alt) wurden auf ihren Gehalt an sauren Glykosaminoglykanen (aGAG) untersucht. Die Konzentration der gesamten aGAG, ausgedrückt in μg Hexuronsäure/100 mg Trockengewicht, betrug bei den Neugeborenen 275,5±27,9 und bei den Erwachsenen 313,4±46,7. Bei den Kleinkindern war sie mit 202,1±21,5 gegenüber den Vergleichskollektiven signifikant vermindert. Das aGAG-Material der Aorten wurde an Mikrosäulen, die cetylpyridinchloridhaltige Cellulose enthielten, chromatographiert. Es bestanden keine signifikanten Unterschiede in den einzelnen aGAG-Fraktionen bei Neugeborenen und Kleinkindern. Ältere Erwachsene jedoch zeigten einen signifikanten Abfall (P〈0,001) der Fraktion II, die hauptsächlich Hyaluronsäure enthält. Die Fraktion VI, die in erster Linie aus Dermatansulfat besteht, war signifikant vermehrt. Der erhöhte Gehalt von aGAG in Neugeborenenaorten ist möglicherweise durch hormonelle Einflüsse (besonders Östrogene) bedingt, denen der Fetus in utero besonders stark ausgesetzt ist.
    Notes: Abstract The contents of acid glycosaminoglycans (aGAG) was determined in the inner and medial layers of aortae from 13 newborns, 9 small children (1–5 years of age), and 10 older adults (7th decade of life). The total aGAG contents was expressed in μg hexuronic acid/100 mg dry weight. Newborns and older adults showed similar contents of aGAG in their aortae (275.5±27.9 and 313.4±46.7, respectively). Small children had significantly less aGAG in their aortae (202.1±21.5). The aGAG material from aortae was fractionated by a microcolumn chromatographic procedure on cetylpyridinium chloride cellulose. No significant differences of the aGAG fractions were found in aortae of newborns and children. In both groups of children the percentage of hyaluronic acid was significantly increased and dermatan sulfate was significantly decreased when compared with aortae from older adults. The increased contents of acid glycosaminoglycans (aGAG) in aortae of human newborns is possibly caused by the concentrated hormonal environment 9especially estrogens) to which the fetus is exposed in utero.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 569 (1989), S. 97-105 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Synthesis of Ferrocenyltriethylstannanes and Electronic Properties of Substituted Ferrocenyl LigandsFerrocenyltriethylstannanes of the type RSnEt3 [R = Et3SnC5H4FeC5H4, C5H5FeC5H3(2-CH2NMe2), C5H5FeC5H3(2-CH2NC5H10), C5H5FeC5H3(2-CH2OMe), MeOCH2C5H4FeC5H4] were synthesized from Et3SnCl and the corresponding ferrocenyl lithium derivatives. The compounds were characterized by elementary analyses, 1H-, 13C-, 119Sn-n.m.r. and i.r. spectroscopic investigations. From the coupling constants 1J(119Sn—13CEt) the electronic influence of substituted ferrocenyl ligands was estimated.
    Notes: Ferrocenyltriethylstannane des Typs RSnEt3 [R = Et3SnC5H4FeC5H4, C5H5FeC5H3(2-CH2NMe2), C5H5FeC5H3(2-CH2NC5H10), C5H5FeC5H3(2-CH2OMe), MeOCH2C5H4FeC5H4] wurden aus Et3SnCl und den entsprechenden Ferrocenyllithium-Derivaten synthetisiert und mittels ihrer 1H-, 13C-, 119Sn-NMR- und IR-Spektren sowie elementaranalytisch charakterisiert. Aus den Kopplungskonstanten 1J(119Sn—13CEt) wurde der elektronische Einfluß der substituierten Ferrocenylreste abgeschätzt.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: On 1.2-Shift Reactions and C—H-Insertions of Acyclic Alkylidene CarbenesTwo series of acyclic terminal vinyl bromides (1…4 and 5…7) were tested in the reaction with potassium tert-butoxide as precursors of alkylidene carbenes. As expected 1 up to 4 only give 1-alkynes whereas the 2-methylated vinyl bromides 5, 6 and 7 yield 1-methylated cyclopentenes predominantly besides 2-alkynes. The formation of cyclopentenes indicates a reaction route via alkylidene carbenes and 1,5-C—H-insertion reactions, that of 2-alkynes is convincing evidence for 1,2-alkyl shift reactions in 2-methyl substituted alkylidene carbenes. The selectivity of 1,5-C—H-insertion depends on the degree of alkyl substitution of the C-5-atom. At 240°C the selectivity is 1°:2°:3° ≈ 1:54:240.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
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