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  • 2020-2024
  • 1975-1979  (25)
  • 1920-1924
  • 1978  (25)
  • Chemistry  (24)
  • Cell & Developmental Biology
  • 11
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Chemie Ingenieur Technik - CIT 50 (1978), S. 782-785 
    ISSN: 0009-286X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
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  • 12
    ISSN: 0021-9541
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: Antisera to mouse brain reacts with hematopoietic stem cells in the mouse bone marrow. We have examined the effect of anti-mouse brain serum (AMBS) on the development of in vitro colonies from mouse bone marrow cells. The addition of 5% AMBS to the cultures markedly decreased the numbers of colonies formed to an average of 10% of the number obtained with normal rabbit serum. AMBS suppressed formation induced by colony stimulating factors (CSF) derived from three different sources; serum from endotoxin treated mice, mouse L-cell conditioned media, and human peripheral blood mononuclear cell conditioned media. The suppressive activity was quantitatively recovered in the IgG fraction of AMBS. Divalent F (ab′)AHBS, rabbit anti-human brain serum; AMBS, rabbit anti-mouse brain serum; BM, bone marrow; CFU-C, colony forming unit in vitro; CFU-S, spleen colony forming unit; CSF, colony stimulating factor; FCS, fetal calf serum; MEM, minimal essential medium; NRS, normal rabbit serum; PBS, 0.01 M sodium phosphate, 0.15 M sodium chloride, pH 7.4. fragments were as effective as the intact IgG in decreasing colony formation. Fab fragments were not suppressive. These results suggest that colony formation is induced via a dynamic interaction between CSF and the progenitor cell membrane, and that antibody directed at cell membrane antigen(s) interferes with the generation of the induction signal.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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  • 13
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1978 (1978), S. 337-344 
    ISSN: 0075-4617
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Reaction of the 2-Butynoic Acid Dianion with Aldehydes; Synthesis of some Natural Products with 5,6-Dihydro-2H-pyran-2-one Structure1)The naturally occurring 5,6-dihydro-2H-pyran-2-ones 6a, 6b and 6e have been synthesised starting from the 2-butynoic acid dianion 1 and the aldehydes 2a  -  c with 5-hydroxy-2-alkynoates 4a  -  c as intermediates.
    Notes: Die natürlich vorkommenden 5,6-Dihydro-2H-pyran-2-onderivate 6a, 6b und 6e werden ausgehend von dem 2-Butinsäuredianion 1 und den Aldehyden 2a  -  c über die 5-Hydroxy-2-alkinsäureester 4a  -  c als Zwischenstufen synthetisiert.
    Type of Medium: Electronic Resource
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  • 14
    ISSN: 0075-4617
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Dihydropyridines, IV.  -  Condensation of Aldehydes with Enediaminocarbonyl CompoundsReaction of aldehydes 1 with double molar quantities of amidinoacetic esters 5 leads to the 2,6-diaminodihydropyridine-3,5-dicarboxylates 8. 2-Amino-6-dialkylamino-4,5-dihydropyridines 12 are obtained by condensation of 1 with 3-amino-3-dialkylaminoacrylic esters 11. Pyridones 17 with bridgehead nitrogen are formed by condensation of 1 with bridged enediaminocarbonyl compounds 15.
    Notes: Die Kondensation von Aldehyden 1 mit Amidinoessigsäureestern 5 im Molverhältnis 1:2 führt zu 2,6-Diaminodihydropyridin-3,5-dicarbonsäureestern 8. 3-Amino-3-dialkylaminoacrylsäureester 11 liefern mit 1 unter analogen Bedingungen die 2-Amino-6-dialkylamino-4,5-dihydropyridine 12. Dihydropyridone 17 mit Brückenkopf-N-Atom werden durch Kondensation von 1 mit den N,N′-verbrückten Endiaminocarbonsäureestern 15 erhalten.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
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  • 15
    ISSN: 0075-4617
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Incorporation of [4'-(E)-13C]4-(3-Methyl-2-butenyl)tryptophan into Clavine Alkaloids and Lysergic AcidThe 13C-enriched C-atom of the 4'(E)-methyl groups of 4-(3-methyl-2-butenyl)tryptophan (3) appears during the biosynthesis at the C-methyl group of chanoclavine (4) and at C-17 of agroclavine (5), elymoclavien (6) and lysergic acid (7).
    Notes: Das 13C-angereicherte C-Atom der 4'-(E)-Methylgruppe im 4-(3-Methyl-2-butenyl)tryptophan (3) erscheint bei der Biosynthese in der C-Methylgruppe des Chanoclavins (4) und im C-17 von Agroclavin (5), Elymoclavin (6) und Lysergsäure (7).
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
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  • 16
    ISSN: 0075-4617
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Synthesis of (±)-2,2-Diethyl-3-methyl- and (±)-2,2-Diethyl-3,6-dimethyl-6-(phenoxyacetamido)-penam-3-carboxylic acidThe title compounds 4I and 4k were synthesized as the potassium salts 4I', 4k' starting from benzyl 4-methyl-2-thiazolinecarboxylate (3a).  -  The preparation of several benzyl 2-thiazoline-4-carboxylates (type 3) from thioketones 2 and 2-metalated benzyl 2-isocyanoalkanecarboxylates 1b, d is described.
    Notes: Die im Titel genannten Verbindungen 4I und 4k wurden (als Kaliumsalze 4I' bzw. 4k') ausgehend von 5,5-Diethyl-4-methyl-2-thiazolin-4-carbonsäure-benzylester (3a) dargestellt.  -  An mehreren Beispielen wird die Synthese von 2-Thiazolin-4-carbonsäure-benzylestern (Typ 3) aus Thioketonen 2 und 2-metallierten 2-Isocyanalkansäureestern 1b und d beschrieben.
    Type of Medium: Electronic Resource
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  • 17
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1978 (1978), S. 1491-1504 
    ISSN: 0075-4617
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Malondiamidines, I.  -  (3 + 3)-Condensations with 1,3-Dicarbonyl CompoundsMalondiamidines 4, 5, 8a-g, 11 and 14 are prepared from corresponding imidates using the Pinner method. The parent compound 5 undergoes condensation with double molar quantities of 1,3-dicarbonyl compounds yielding 3-(2-pyrimidyl)-2-pyridinamines 16 and 17a-g. Condensation of 1,3-dicarbonyl compounds with N,N′-bridged malondiamidine 11 furnishes 8-(2-imidazolinyl)imidazo[1,2-a]pyridines 19a-d. H/D-exchange phenomena of the 5,7-dimethyl derivative 19a are discussed. Use of 3-keto esters and tricarbonyl compounds in condensation with 11 results in formation of 26, 27 and 28, respectively.
    Notes: Die Malondiamidine 4, 5, 8a-g, 11 und 14 werden aus den korrespondierenden Imidsäureestern nach Pinner hergestellt. Die Stammverbindung 5 kondensiert mit der doppelt molaren Menge von 1,3-Dicarbonylverbindungen zu 3-(2-Pyrimidyl)-2-pyridinaminen 16 und 17a-g. Bei der Kondensation von dem N,N′-verbrückten Malondiamidin 11 mit 1,3-Dicarbonylverbindungen resultieren die 8-(2-Imidazolinyl)imidazo[1,2-a]pyridine 19a-d. Die H/D-Austauschphänomene des 5,7-Dimethylderivates 19a in der 1H-NMR-Spektroskopie werden diskutiert. Der Einsatz von 3-Ketocarbonsäureestern und 1,3,5-Tricarbonylverbindungen in der Kondensation mit 11 führt zu den Tri- bzw. Tetracyclen 26, 27 und 28.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
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  • 18
    ISSN: 0075-4617
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Dihydropyridines V.  -  Synthesis of AminodihydropyridonesMichael addition of amidinoacetic esters 1 to aralkylidene malonates 5 is followed by ring closure to 2-amino-4-aryl-6-oxo-1,4,5,6-tetrahydropyridine-3,5-dicarboxylates 11a-m. Analogous addition of 1 to ethyl cinnamate furnishes the monoester 13. 4-Aralkylidene-2-methyloxazole-5(4H)-ones 14 are attacked by 1 with subsequent opening of the oxazole ring leading to 5-acetylamino-2-amino-4-aryl-6-oxo-1,4,5,6-tetrahydropyridine-3-carboxylates 15a-c.
    Notes: Die cyclisierende Michael-Addition von Amidinoessigsäureestern 1 an die Aralkylidenmalonsäurediester 5 fährt zu den 2-Amino-4-aryl-6-oxo-1,4,5,6-tetrahydropyridin-3,5-dicarbonsäureestern 11a-m. Die analoge Addition an Zimtsäure-ethylester liefert den Monoester 13. An 4-Aralkyliden-2-methyloxazol-5(4H)-one 14 wird 1 unter nachfolgender Öffnung des Oxazolrings zu den 5-Acetylamino-2-amino-4-aryl-6-oxo-1,4,5,6-tetrahydropyridin-3-carbonsäureestern 15a-c addiert.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
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  • 19
    Electronic Resource
    Electronic Resource
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 13 (1978), S. 207-208 
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Collision induced dissociations of some molecular ions generated by electron impact or charge exchange from methane plasma are compared.
    Notes: Les dissociations induites par collisions d'ions moléculaires créés par impact d'électrons et par échange de charges dans une source d'ionisation chimique (méthane) sont comparés.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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  • 20
    Electronic Resource
    Electronic Resource
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 11 (1978), S. 50-51 
    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The complete assignment of the 13C NMR spectrum of a conformationally rigid camphane phosphonate derivative leads to a Karplus-type function for the vicinal 3J(CCCP) coupling constants in phosphonates. The general applicability of this relationship is demonstrated.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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