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  • Organic Chemistry  (62)
  • Cell & Developmental Biology  (33)
  • Polymer and Materials Science  (29)
  • actin  (8)
  • Biochemistry and Biotechnology  (6)
  • Development  (3)
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  • 1
    Digitale Medien
    Digitale Medien
    Developmental and morphological analyses of homeotic cytoplasmic male sterile and fertile carrot flowers (1994)
    Springer
    Sexual plant reproduction 7 (1994), S. 41-50 
    Details
    ISSN: 1432-2145
    Schlagwort(e): Carrot ; Cytoplasmic male sterility Homeosis ; Morphology ; Development
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract Floral development and morphology were observed for two homeotic cytoplasmic male sterile carrot lines and their isonuclear fertile maintainers. For one sterile line, W33A stamens are replaced by petal-like organs; for the other, W259A, both stamens and petals are replaced by green bract-like structures. Both isonuclear maintainers, W33B and W259B respectively, have stamens and white petals. The different sterile phenotypes result from the interactions of distinct nuclear genotypes with one sterility-inducing cytoplasm. Early stages of floral development were similar among all four lines; the third whorl primordia were radial while those in the second whorl were dorsiventral. However, the third whorl primordia were splayed outward in the sterile lines and inward in the fertile lines. Subsequently, radial anthers on filaments differentiated in fertile lines and dorsiventral hastate and cordate shaped structures appeared in W33A and W259A, respectively. In the mature flower, the third whorl organs were cordate in W33A and ovate in W259A. Based on epidermal cell morphology, the second whorl organs of the two sterile lines had characteristics of both petals and bracts, but of opposite degrees; cells of W33A and W259A were most similar to those of petals and bracts, respectively. The third whorl organs of the sterile lines had characteristics of their respective second whorl organs; however, structures of W33A also had filament-like cells and those of W259A were more bract-like than their respective second whorl organs. The cytoplasm affected when homeosis was manifested during development. Nuclear factors interacting with cytoplasm were most important for determining differentiation. The significance of cytoplasm to current models of nuclear-gene-controlled homeosis is discussed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00241886
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  • 2
    Digitale Medien
    Digitale Medien
    Midbody sealing after cytokinesis in embryos of the sea urchin Arabacia punctulata (1985)
    Springer
    Cell & tissue research 240 (1985), S. 287-292 
    Details
    ISSN: 1432-0878
    Schlagwort(e): Cytokinesis ; Dye coupling ; Development ; Embryo ; Microinjection ; Sea urchin Arabacia punctulata
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Notizen: Summary Cytokinesis consists of a contractile phase followed by sealing of the connecting midbody to form two separated cells. To determine how soon the midbody sealed after cleavage furrow contraction, the fluorescent dye Lucifer Yellow CH(457.3 M.W.) was microinjected into cells at various intervals after cleavage had begun. Mitotic PtK2 cells were recorded with video-microscopy so that daughter cells in the epithelial sheet could be identified for several hours after cell division. One daughter cell of each pair followed was microinjected to determine whether the dye diffused into the other daughter cell. For intervals up to four hours after the beginning of cytokinesis, diffusion took place between daughter cells. After this time the dye did not spread between daughter cells. In sea urchin blastomeres of the first, second and third divisions, Lucifer Yellow passed between daughter blastomeres only during the first 15 min after cytokinesis. If one cell of a two-cell, four-cell or eight-cell embryo was microinjected more than 15 min after the last cleavage, the dye remained in the injected cell and was distributed to all progeny of that cell, resulting in blastulae that were either one-half, one-quarter or one-eighth fluorescent, respectively. Thus, although cleavage furrow contraction takes approximately the same amount of time in sea urchin blastomeres and PtK2 cells, the time of midbody sealing differs dramatically in the two cell types. Our results also indicate the importance of knowing the mitotic history of cells when injecting dyes into interphase cells for the purpose of detecting gap junctions.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00222337
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  • 3
    Digitale Medien
    Digitale Medien
    Monodisperse polymer beads as packing material for high-performance liquid chromatography. Synthesis and properties of monidisperse polystyrene and poly(methacrylate) latex seeds (1992)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 195 (1992), S. 151-164 
    Details
    ISSN: 0003-3146
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Physik
    Beschreibung / Inhaltsverzeichnis: Der Einfluß von Initiatorkonzentration, Ionenstärke des Polymerisationsmediums, Polymerisationstemperatur und Monomer/Wasser-Phasenverhältnis auf Teilchengröße, Teilchengrößenverteilung und Molekulargewicht der gebildeten Polymeren bei der emulgatorfreien Emulsionspolymerisation von Styrol, Methylmethacrylat und Glycidylmethacrylat wurde untersucht. Für die Herstellung von Polystyrolpartikeln einheitlicher Größe (〉 1 μm) wurden die optimalen Bedingungen gefunden; für die anderen beiden Monomeren gelang dies nicht. Es wird gezeigt, daß die Quellfähigkeit “nichtaktivierter” Latexpartikel eine Volumenzunahme auf das 70fache nicht übersteigt und stark von der Größe der ursprünglichen Partikel abhängt.
    Notizen: The effects of initiator concentration, ionic strength of polymerization medium, polymerization temperature, and monomer/water phase ratio on particle size, particle size distribution and molecular weight of the resulting polymers prepared by an emulsifier-free emulsion polymerization of styrene, methyl methacrylate and glycidyl methacrylate have been studied. Optimal conditions for preparation of uniformly sized polystyrene particles larger than 1 μm have been found. An attempt to synthesize monodisperse particles of similar size from methacrylate monomers and crosslinked particles has failed. It is shown that the swelling ability of “non-activated” latex particles does not exceed 70 fold increase in the volume and strongly depends on the size of the original particles.
    Zusätzliches Material: 5 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/apmc.1992.051950112
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  • 4
    Digitale Medien
    Digitale Medien
    Nouveaux types de sucres acétyléniques. Communication préliminaireUne communication plus détaillée paraîtra ultérieurement. (1977)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 60 (1977), S. 892-895 
    Details
    ISSN: 0018-019X
    Schlagwort(e): Chemistry ; Organic Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: Novel types of acetylenic sugarsThe coupling, following Cadiot's procedure, of a 6-bromo-5,6-dideoxy-1,2-O-isopropylidène-3-O-methyl-α-D-xylo-hex-5-yno-1, 4-furanose (1) with phenylacetylene, 2-propyn-1-ol or terminal acetylenic sugars gave with excellent yields the expected diynes (an enediyne when the terminal acetylene was the 3,5, 6-trideoxy-1,2-O-isopropylidene-α-D-glycero-hex-3-en-5-yno-1,4-furanose 7). The chloro analogue 8 of 1 on treatment with lithium thiophenate gave the corresponding phenylthio-acetylenic sugar 9. An acetylene was also formed by reacting the gem-difluoro-olefinic sugar 10 with butyllithium whereas the same olefinic sugar and its 3-O-benzyl analogue 11 gave only a gem-fluoro-arylthio-olefinic sugar (13-15) as a mixture of the Z and E isomers (Z/E 〉 4) when treated with the conjugate base of an arylmercaptan.
    Zusätzliches Material: 1 Tab.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/hlca.19770600319
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  • 5
    Digitale Medien
    Digitale Medien
    Nouveaux exemples de radicaux libres stables de dérivés hétérocycliques de sucresDérivés C-glycosyliques XXXIV. Pour la 33c communication v. [1].. Communication préliminaireUne communication plus détaillée paraîtra ultérieurement. (1977)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 60 (1977), S. 888-891 
    Details
    ISSN: 0018-019X
    Schlagwort(e): Chemistry ; Organic Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: Some more examples of stable free radicals of carbohydrate heterocyclic derivatives2-Glycosyl-4,4,5,5-tetramethylimidazoline- 3-oxide-1-oxyls and 2-glycosyl-4,4,5,5-tetramethylimidazoline 1-oxyls have been prepared in nine carbohydrate series, which proves the generality of the method. The hyperfine coupling constant between the free electron and the α-proton of the glycosyl group is never very large (0-2.3 G) but a correlation between its value and the structure of the aglycone has been noted. Free radicals of that type, stable in aqueous solutions, are potentially interesting for biological studies.
    Zusätzliches Material: 2 Tab.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/hlca.19770600318
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  • 6
    Digitale Medien
    Digitale Medien
    C-nucleosides aminoisoxazoliquesDérivés C-glyosyliques XXXVI. La réf. [1] constitute la 35e communication de cette série.. Communication préliminaireUne communication plus détaillée paraîtra ultérieurement. (1979)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 62 (1979), S. 833-837 
    Details
    ISSN: 0018-019X
    Schlagwort(e): Chemistry ; Organic Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: Aminoisoxazoles C-nucleosidesUpon treatment with bromocyanomethylenetriphenylphosphorane, a series of aldehydosugar derivatives gave in good to excellent yields the corresponding terminal gem-bromocyanoenoses 3, 7-10 and 16. Reacted with hydroxylamine, these unsaturated sugars led to the expected [3] 5-amino-3-glycosylisoxazoles 4, 11, 12 and 17, whereas using hydroxyurea as a binucleophile they gave the corresponding 3-amino-5-glycosylisoxazoles 13 and 14 as previously described in other series [3]. The major interest of these compounds rests in their being close analogs (or enantiomers of analogs) of important biological compounds as f.e. AICAR.
    Zusätzliches Material: 2 Tab.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/hlca.19790620320
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  • 7
    Digitale Medien
    Digitale Medien
    Dérivés diglycosyliques. Communication préliminaireUne communication plus détaillée paraîtra ultérieurement. (1979)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 62 (1979), S. 894-898 
    Details
    ISSN: 0018-019X
    Schlagwort(e): Chemistry ; Organic Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: Diglycosyl Derivatives. Preliminary communicationNovel types of diglycosyl compounds, some of them bearing a resemblance to natural di- or tri-saccharides are described: a diglycosyldiyne (1), a diglycosylthiophene (2), a diglycosylaziridine (3), a diglycosyldioxolane (4), as well as six C,N-diglycosylnitrones, 9b-9f and 14. These C,N-diglycosylnitrones, on treatment with an acetylenic Grignard reagent, led to the expected acetylenic diglycosyl-hydroxylamine 11, whereas diglycosylisoxazolines (f. ex. 10) were obtained when these nitrones underwent 1,3-dipolar cycloaddition to acetylenic compounds.
    Zusätzliches Material: 1 Tab.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/hlca.19790620328
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  • 8
    Digitale Medien
    Digitale Medien
    Analogues de la lincomycine. I. Allongement de la chaîne du di-O-isopropylidène-1,2:3,4-α-D-galacto-hexodialdopyrannose-1,5Une partie de ce travail a fait l'objet d'une communication à la “XVth Conference of Pharmaceutical Sciences” Le Caire, Décembre 1977. (1979)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 62 (1979), S. 1632-1639 
    Details
    ISSN: 0018-019X
    Schlagwort(e): Chemistry ; Organic Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: Lincomycin analogues. I. Chain-extensions of [1,2:3,4]-di-O-isopropylidene-α-D-galacto-hexodialdo-1,5-pyranoseThe title aldehydosugar 1 treated with Wittig reagents led in good to excellent yields to the unsaturated sugar derivatives 3-7 and 10-15, 8 having been prepared by condensation of 1 with malonic acid. The configuration (Z or E) of each compound obtained has been established by 1H-NMR. These chain-extensions constitute the first synthetic step towards the preparation of lincomycin analogues.
    Zusätzliches Material: 2 Tab.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/hlca.19790620530
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  • 9
    Digitale Medien
    Digitale Medien
    Action du cyanure mercurique sur quelques halogénures de désoxy-3-trifluoroacétamido-3-D-ribofurannosyle. Note de laboratoire (1980)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 63 (1980), S. 2258-2263 
    Details
    ISSN: 0018-019X
    Schlagwort(e): Chemistry ; Organic Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: Reactions of Some 3-Deoxy-3-trifluoroacetamido-D-ribofuranosyl Halides with Mercuric CyanideThe expected 2,5-anhydro-D-allononitrile 11 was obtained when the 2-O-benzoyl-3-deoxy-3-trifluoroacetamido-D-ribofuranosyl bromide reacted with mercuric cyanide, whereas the isomeric 1,2-O (1-cyanoethylidene) derivative was formed from the 2-O-acetylated halide; no reaction occurred when the halide was 2-O-p-nitrobenzoylated.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/hlca.19800630814
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  • 10
    Digitale Medien
    Digitale Medien
    Un nouvel exemple de nucléoside à sucre ramifié insaturé: la désoxy-3′-méthylidène-3′-adénosine (1981)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 64 (1981), S. 425-429 
    Details
    ISSN: 0018-019X
    Schlagwort(e): Chemistry ; Organic Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: A Novel Example of Unsaturated Branched-chain Sugar Nucleoside: 3′-Deoxy-3′-methylidene-adenosineStarting from 5-O-benzoyl-3-C-methylidene-3-deoxy-1,2-O-isopropylidene-α-D-erythro-pentofuranose (11) the title compound 8 has been prepared. Its α-anomer (9) and the acyclic sugar nucleoside 10 have been obtained as by-products. Adenosine deaminase slowly deaminated 8, 9 being not affected. Compound 8 exhibited no antiviral activity, whereas one of its saturated analogues (13) inhibited the multiplication of the herpes-1 (HF) virus.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/hlca.19810640207
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