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  • Wiley-Blackwell  (38)
  • American Institute of Physics  (32)
  • Nature Publishing Group  (4)
  • Springer Nature  (4)
  • 2010-2014
  • 1985-1989  (47)
  • 1975-1979  (31)
  • 1989  (47)
  • 1975  (31)
  • 1
    Electronic Resource
    Electronic Resource
    Axonal wiring and polarisation sensitivity in eye of the rock lobster (1975)
    [s.l.] : Nature Publishing Group
    Nature 254 (1975), S. 522-523 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] A modified organisation has been found only in Diptera1 and now in Decapoda: in both these unrelated orders of arthropods, retinula cell axons interweave before they terminate on axons of the ganglion cells in the lamina cartridges. Whereas in Diptera this rather special arrangement is generally ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/254522a0
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  • 2
    Electronic Resource
    Electronic Resource
    Petroleum-degrading achlorophyllous alga Prototheca zopfii (1975)
    [s.l.] : Nature Publishing Group
    Nature 254 (1975), S. 423-424 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Routine environmental parameters measured during April and May 1973 and 1974 yielded similar data for both years: air temperature 18-21 C; dissolved oxygen, 9-12 p.p.m.; water temperature, 12-17 C; pH 7-8, and salinity, 6-8 %0. The unusual organism was isolated at a time of year when significant ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/254423a0
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  • 3
    Electronic Resource
    Electronic Resource
    Mapping of the G 1 phase of a mammalian cell cycle (1975)
    [s.l.] : Nature Publishing Group
    Nature 258 (1975), S. 49-53 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Temperature-sensitive variant clones of BALB/3T3 cells were put on a linear time scale map by measuring their time of entry into S phase; these clones seemed to accumulate a unique non-histone protein at the restricted ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/258049a0
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  • 4
    Electronic Resource
    Electronic Resource
    Reassortment of pilin genes in Neisseria gonorrhoeae occurs by two distinct mechanisms (1989)
    [s.l.] : Nature Publishing Group
    Nature 338 (1989), S. 651-652 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Several revertible piliation phases have been described for JV. gonorrhoeae: conventional P+ variants; S-variants, which produce a soluble secreted pilin and show intermediate degrees of piliation, and L-variants, which have a tandem duplication in the pilin structural gene and which synthesize an ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/338651a0
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  • 5
    Electronic Resource
    Electronic Resource
    Zur statistik des einbaus einer als regler in polyamid 12 verwendeten aliphatischen dicarbonsäureHerrn Prof. Dr. Dr. h. c. H. Hellmann zum 75. Geburtstag gewidmet. (1989)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 169 (1989), S. 193-209 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: As hard blocks in polyether block amides, polyamides are used whose length is intensively regulated by dicarboxylic acids. Since, with regard to melting and crystallization behaviour, this acid constitutes an interfering structural unit in the chain, and in the case of a completely converted product each chain contains one acid molecule, it is essential to know where in the chain incorporation will occur. As opposed to monofunctional chain regulators which always form a chain end, a bifunctional chain regulator can a priori also be randomly incorporated into the inner part of the chain. This leads to a far greater interference than occurs if the chain regulator molecule and the chain end, which acts as an interfering unit in any case, coincide with each other.By means of adipic acid-regulated oligoamides based on lauryl lactam, the incorporation of the chain regulator was examined by NMR spectroscopy and compared with model calculations. This resulted in a close match only if it was presupposed that the incorporation was carried out randomly with the same degree of probability at any point whatsoever between two lauryl lactam structural units or at the chain end.Further calculations illustrate the effects of the incorporation of the chain regulator on the size of the amorphous portion.
    Notes: Als Hartblöcke in Polyetherblockamiden werden durch Dicarbonsäuren stark geregelte Polyamide eingesetzt. Da die Säure in Hinblick auf das Schmelz- und Kristallisationsverhalten einen Störbaustein in der Kette darstellt und bei einem ausgeregelten Produkt jede Kette ein Säuremolekül enthält, ist es von Bedeutung zu wissen, wo in der Kette der Einbau erfolgt. Anders als bei monofunktionellen Reglern, wo der Regler stets ein Kettenende bildet, kann ein bifunktioneller Regler a priori auch statistisch im Inneren der Kette eingebaut werden. Dies führt zu einer viel stärkeren Störung, als wenn das Reglermolekül und das sowieso als Störstelle wirkende Kettenende zusammenfallen. Anhand adipinsäuregeregelter Oligoamide auf Basis von Laurinlactam wird kernresonanzspektroskopisch der Einbau des Reglers untersucht und mit Rechnungen verglichen. Es ergibt sich nur dann gute Übereinstimmung, wenn vorausgesetzt wird, daß der Einbau statistisch erfolgt und dabei mit gleicher Wahrscheinlichkeit für jede beliebige Stelle zwischen zwei Laurinlactambausteinen oder am Kettenende abläuft. Weitere Rechnungen verdeutlichen den Einfluß des Reglereinbaus auf die Größe des amorphen Anteils.
    Additional Material: 6 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1989.051690118
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  • 6
    Electronic Resource
    Electronic Resource
    A method for measuring sedimentation and diffusion of macromolecules in capillary tubes by total intensity and quasi-elastic light-scattering techniquesPresented in part at the Symposium on New Generation Instrumentation in Rheology, Rheology Society, Cincinnati, Ohio, January 1973, by M. H. Birnboim. (1975)
    New York : Wiley-Blackwell
    Biopolymers 14 (1975), S. 419-430 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Light scattered from a macromolecular solution in a capillary tube is used to determine both the sedimentation and translational diffusion coefficients. The capillary tube is spun in a preparative centrifuge, removed, and placed in a light-scattering photometer equipped with a scanning mechanism. The intensity distribution of scattered light along the tube represents the concentration profile in the tube and provides the measure of boundary migration. The sedimentation coefficient is determined from this measure and the applied centrifugal field. The diffusion coefficient is obtained from a time-autocorrelation analysis of fluctuations in intensity of light scattered from any fixed point of the profile. These coefficients were obtained for two monodisperse systems, R17 bacteriophage and 28s ribosomal rat liver RNA. The molecular weights obtained from ratios of these coefficients are in good agreement with literature values. In the sedimentation analysis, deviations from linearity between boundary displacement and applied field were found to be less than 1%. This precision confirms that the boundary is stable for the capillary geometry even in the absence of a preformed density gradient. The sedimentation coefficients of identical samples were also measured with the Spinco Model E analytical ultracentrifuge; results of the two methods agree to within 4%.As a consequence of the capillary tube geometry and light-scattering detection, sedimentation coefficients can be obtained from sample volumes of less than 100 μl. This detection techniques is thus far demonstrated to be at least an order of magnitude more sensitive than Schlieren optics, thereby useful when uv absorption is not applicable. For diffusion measurements there are also several inherent advantages. The diffusion coefficient is obtained from the identical sample, and scanning provides the capability to measure D from various parts of the sedimentation profiles and thereby directly explore concentration dependence, homogeneity, and integrity of the sample. The capillary tube with a layer of silicone oil over the sample and centrifugation provides an effective method to cleanse the solution and trap all dust.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.1975.360140214
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  • 7
    Electronic Resource
    Electronic Resource
    Di- und Polyaminozucker, XXI. Synthese von Derivaten der 2,4-Diamino-2,3,4-tridesoxy-D-ribo-hexose (1975)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 108 (1975), S. 3397-3411 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Di-and Polyamino Sugars, XXI. Synthesis of Derivatives of 2,4-Diamino-2,3,4-trideoxy-D-ribo-hexoseStarting with D-glucose the title compound has been synthesized as its di-N-acetyl. -trifluoroacetyl and N,N′-bis(2,4-dinitrophenyl) derivative. The free sugar could not be obtained in a pure state.
    Notes: Die Titelverbindung wurde, ausgehend von D-Glucose, in Form ihres Di-N-acetyl-, -trifluoracetyl- und ihres N,N′-Bis(2,4-dinitrophenyl)-Derivates erhalten. Reindarstellung des freien Zuckers gelang nicht.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19751081031
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  • 8
    Electronic Resource
    Electronic Resource
    Heterocyclische Siebenring-Verbindungen, XVI. Synthese gezielt 3,5-substituierter 4-Phenyl-1-benzothiepine (1975)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 108 (1975), S. 3596-3610 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Heterocyclic Seven-membered Ring Compounds, XVI. Synthesis of 3,5-Substituted 4-Phenyl-1-benzothiepins4-Phenyl-1-benzothiepins 7 and 8 are synthesized starting from their 5-methoxy-2,3-dihydro-precursor 2; using the 2,5-dihydro-intermediate 12 yields the 4-phenyl-1-benzothiepins 13 and 14. The 1-benzothiepin 17 can be obtained from the diketone 1 directly. The 3-cyano-substituted compound 22 is prepared from its 2,5-dihydro-precursor 21. Some ring-contraction and ring-cleavage reactions of the heterocyclic seven-membered ring-system are described.
    Notes: Die 5-Methoxy-2,3-dihydro-Vorstufe 2 wird in die 4-Phenyl-1-benzothiepine 7 und 8 übergeführt; aus der 2,5-Dihydro-Vorstufe 12 werden die 4-Phenyl-1-benzothiepine 13 und 14 dargestellt. Das 1-Benzothiepin 17 wird direkt aus dem Siebenring-Diketon 1 erhalten. Das 3-cyan-substituierte 1-Benzothiepin 22 erhält man aus der 2,5-Dihydro-Vorstufe 21. Es werden einige Ringverengungsbzw. Ringspaltungsreaktionen des heterocyclischen Siebenring-Systems beschrieben.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19751081121
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  • 9
    Electronic Resource
    Electronic Resource
    Beiträge zur Chemie des Indols, VIII. Decarboxylierungen einiger 1-Alkyl-2-carboxy-3-indolessigsäuren sowie Synthese eines 5-Thiocyanato-2,3-dihydroindols (1975)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 108 (1975), S. 3538-3542 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Not mentioned2a-d, easily produced from the N-alkyl-N-phenylhydrazines 1a-d and 2-oxoglutaric acid, are decarboxylated to the compounds 4a-d in high yields. 2a is reduced to the 2,3-dihydro compound 3a and reacts via the amide 5a to the 5-thiocyanato derivative 6a.
    Notes: Contributions to the Chemistry of Indole, VIII. Decarboxylations of Some 1-Alkyl-2-carboxy-3-indolacetic Acids and Synthesis of a 5-Thiocyanato-2,3-dihydroindole-d, leicht darstellbar aus N-Alkyl-N-phenylhydrazin und 2-Oxoglutarsäure, werden mit hoher Ausbeute zu 4a-d decarboxyliert. 2a wird zum Dihydroindol 3a reduziert und über das Amid 5a zum 5-Thiocyanatoderivat 6a umgesetzt.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19751081115
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  • 10
    Electronic Resource
    Electronic Resource
    Übergangsmetall-Silyl-Komplexe, 26. Gold(I)-Silyl-Komplexe (1989)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 122 (1989), S. 223-230 
    Details
    ISSN: 0009-2940
    Keywords: Gold(I) silyl complexes ; Transition-metal silyl complexes ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Transition-Metal Silyl Complexes, 26. - Gold(I) Silyl ComplexesComplexes of type L-Au-SiR3 with L = PR′3 or PhNC and SiR3 = Si(aryl)3, Si(SiMe3)3, or SiPh2Me are prepared by reaction of L-Au-Cl with LiSiR3. Depending on L and R, their stability decreases, in the order R′3P-Au-Si(aryl)3 〉 R′3P-Au-Si(SiMe3)3 〉 R′3P-Au-SiPh2Me ≈ PhNC-Au-SiR3. Reaction of R′3P-Au-CH3 or R′3P-Au-OAc with HSiR3 does not yield silyl complexes. However, using chlorinated silanes like HSiR2Cl, CH3/Cl or OAc/Cl exchange takes place. The Mössbauer spectrum of MePh2P-Au-SiPh3 (6) and NMR- and IR-spectroscopic investigations show that silyl groups act as strong σ donors towards the gold atom. MePh2P-Au-SiPh3 (6) and MePh2P-Au-Si(SiMe3)3 (7) have been characterized by X-ray structure analyses [Au—Si 235.4(4) and 235.6(2) pm]. The Au-Si bond in MePh2P-Au-SiPh2Tol (5) is cleaved by X2 (X = Cl, Br, I), HCl or MeI, but not by H2O or MeOH.
    Notes: Komplexe des Typs L-Au-SiR3 mit L = PR′3 oder PhNC und SiR3 = Si(aryl)3, Si(SiMe3)3 oder SiPh2Me wurden durch Umsetzung von L-Au-Cl mit LiSiR3 dargestellt. Ihre Stabilität sinkt in Abhängigkeit von L und R in der Reihenfolge R′3P-Au-Si(aryl)3 〉 R′3P-Au-Si(SiMe3)3 〉 R′3P-Au-SiPh2Me ≈ PhNC-Au-SiR3. Umsetzung von R′3P-Au-CH3 oder R′3P-Au-OAc mit HSiR3 ergibt keine Silyl-Komplexe, bei Verwendung chlorierter Silane, HSi-R2Cl, findet lediglich CH3/Cl- bzw. OAc/Cl-Austausch statt. Das Mößbauer-Spektrum von MePh2P-Au-SiPh3 (6) sowie NMR- und IR-spektroskopische Untersuchungen zeigen, daß Silylreste als starke σ-Donor-Liganden gegenüber dem Goldatom wirken. MePh2P-Au-SiPh3 (6) und MePh2P-Au-Si(SiMe3)3 (7) wurden durch Röntgenstrukturanalysen charakterisiert [Au—Si 235.4(4) und 235.6(2) pm]. Die Au—Si-Bindung in MePh2P-Au-SiPh2 Tol (5) wird durch X2 (X = Cl, Br, I), HCl oder MeI, nicht aber durch H2O oder MeOH gespalten.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19891220203
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