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  • Wiley  (236)
  • Wiley-Blackwell  (110)
  • 1985-1989  (211)
  • 1965-1969  (80)
  • 1960-1964  (55)
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  • 1
    Electronic Resource
    Electronic Resource
    Collagen fibrillogenesis in vitro: An investigation of the thermal memory effect and of the early events occurring during fibril assembly using dynamic light scattering (1986)
    New York : Wiley-Blackwell
    Biopolymers 25 (1986), S. 1185-1207 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Dynamic light scattering has been used to characterize a variety of lathyritic rat skin collagen solutions. The technique was used to monitor the onset of fibril assembly in vitro and to investigate the thermal memory effect. Although the incorporation of thermal memory was demonstrated by reheating the sample and subsequently observing a shortened turbidimetric lag phase, no significant differences between naive solutions and ones exhibiting thermal memory could be detected using photon correlation spectroscopy. This suggests that subtle changes in the state of the collagen molecules rather than extensive changes in the degree of aggregation are responsible for the thermal memory effect. During fibrillogenesis, no large-scale changes in the distribution of monomers or aggregates occur until near the end of the lag phase.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.360250703
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  • 2
    Electronic Resource
    Electronic Resource
    Über die Darstellung einiger Polychlor-naphthaline (1962)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 95 (1962), S. 1043-1048 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 2.3.6.7-Tetrafchlor-naphthalin ließ sich durch Decarboxylierung der 2.3.6.7-Tetrachlor-naphthalintetracarbonsäure darstellen. Im Verlauf von deren Synthese aus Pyren wurde das Tetradecachlor-1.2.6.7-tetrahydro-pyren isoliert. Aus dem 1.5-Diamino-4.8-dichlor-naphthalin entstand bei de Sandmeyer-Reaktion das 1.4.5.8-Tetrachlor-naphthalin, dessen Struktur die analoge Darstellung des bekannten 1.5-Dichlor-4.8-dibrom-naphthalins beweist. Bei der Chlorierung des 1.5-Bis-tosylamino-naphthalins in Trichlorbenzol wurde das 2.4.6.8-Tetrachlor Derivat erhalten, welches sich nach Abspaltung der Tosylgruppen über die Tetrazoniumsalze in 1.3.5.7-Tetrachlor-, 1.3.4.5.7.8-Hexachlor- und 1.3.5.7-Tetrachlor-4.8-dihydroxy-naphthalin überführen ließ.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19620950436
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  • 3
    Electronic Resource
    Electronic Resource
    Proton transfer and triol formation in the simulation of GABA solvation (1988)
    New York, NY : Wiley-Blackwell
    International Journal of Quantum Chemistry 34 (1988), S. 593-600 
    Details
    ISSN: 0020-7608
    Keywords: Computational Chemistry and Molecular Modeling ; Atomic, Molecular and Optical Physics
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: γ-Aminobutyric acid (GABA) is an inhibitory transmitter used by interneurons in the central nervous system (CNS). In aqueous solution GABA exists as a zwitterion, but in the gas phase the stable form of GABA is a nonzwitterion. Since zwitterions are difficult to transport into the CNS, details of the mechanism for the transformation between nonzwitterionic and zwitterion forms of GABA provide potentially important suggestions for enhancing transport of GABA and GABA analogues into the CNS. A mechanism for the conversion of GABA into the zwitterion form upon aqueous solvation is suggested as a multistage process by simple quantum chemical simulation. Initially, hydrogen bonding at the carbonyl oxygen is followed by attack of water at the carbonyl carbon and results in the formation of a triol. Hydrogen bond bridging, through solvent, from the triol end of the molecule to the amino terminus, facilitates N-protonation from the solvent. The latter appears to trigger rearrangement of the hydrogen bonding at the triol function, thus giving the anionic precursor to the zwitterion. This mechanism is based upon full INDO calculations using a supermolecule composed of GABA and 14 water molecules and resembles part of one of the mechanisms for the hydrolysis of esters as well as a process for the hydration of aldehydes.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/qua.560340863
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  • 4
    Electronic Resource
    Electronic Resource
    Graph theory in the study of metal cluster bonding topology: Applications to metal clusters having fused polyhedra (1986)
    New York, NY : Wiley-Blackwell
    International Journal of Quantum Chemistry 30 (1986), S. 227-238 
    Details
    ISSN: 0020-7608
    Keywords: Computational Chemistry and Molecular Modeling ; Atomic, Molecular and Optical Physics
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The energy levels in a delocalized two- or three-dimensional chemical structure are related to the eigenvalues of the graph representing the corresponding bonding topology. Such relatively crude but computationally undemanding graph theory-derived models provide a clear demonstration of the close relationship between two-dimensional aromatic systems such as benzene and three-dimensional aromatic systems such as deltahedral boranes, carboranes, and metal clusters. The basic building blocks for the three-dimensional aromatic systems are deltahedra, having no degree 3 vertices. Delocalized bonding in such systems having v vertices requires two electrons for a multicenter core bond as well as 2v electrons for pairwise surface bonding. A problem of particular interest is how metal cluster polyhedra can fuse together, leading ultimately to the infinite structures of the bulk metals. As a model for such processes the fusion of rhodium carbonyl octahedra is examined using graph theory-derived methods. These lead to reasonable electron-precise models for the bonding topologies in the “biphenyl analogue” [Rh12(CO)30]2-, the “naphthalene analogue” [Rh9(CO)19]3-, the “anthracene analogue” H2Rh12(CO)25, and the “perinaphthene analogue” [Rh11(CO)23]3-. Similar models can also be developed for clusters based on centered larger rhodium polyhedra as exemplified by the centered cuboctahedral clusters of the type [Rh13(CO)24H5-q]q- (q = 2, 3, 4) representing a fragment of the hexagonal close-packed metal structure.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/qua.560300722
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  • 5
    Electronic Resource
    Electronic Resource
    Elasto-plastic solutions of engineering problems ‘initial stress’, finite element approach (1969)
    Chichester [u.a.] : Wiley-Blackwell
    International Journal for Numerical Methods in Engineering 1 (1969), S. 75-100 
    Details
    ISSN: 0029-5981
    Keywords: Engineering ; Engineering General
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mathematics , Technology
    Notes: The paper presents first a general formulation of the elasto-plastic matrix for evaluating stress increments from those of stresses for any yield surface with an associated flow rule. A new ‘initial stress’ computational process is proposed which is shown (1) to yield more rapid convergence than alternative approaches (2) to permit large load increments without violating the yield criteria and thus simply to establish lower bound solutions. Several solutions showing stress distribution, strain development and growth of plastic enclaves are given both for the von Mises and for Coulomb (Drucker) type yield surfaces. Load reversal and thermoplastic behaviour are dealt with.
    Additional Material: 18 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/nme.1620010107
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  • 6
    Electronic Resource
    Electronic Resource
    The dynamic mechanical properties of poly(alkyl 2-cyanoacrylates) (1987)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 188 (1987), S. 3041-3046 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Various poly(alkyl 2-cyanoacrylates) and poly(allyl 2-cyanoacrylates) having different molecular weights have been prepared. Dynamic mechanical analysis was carried out over the temperature range 23°Cto 230°Cat a fixed frequency of 110 Hz, in order to study the effect of temperature on the storage modules, loss modulus and loss tangent of the films. From these data, the glass transition temperature of the polymers could be determined and the effect of the alkyl group on the stiffness of the polymers could be evaluated. It is shown that crosslinking occurs in the case of poly(allyl 2-cyanoacrylates) when it is subjected to temperatures above its glass transition temperature. This crosslinking is seen as a rapid increase in the storage modulus. This increase is eliminated if the polymer samples are thermally aged prior to dynamic mechanical analysis.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1987.021881224
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  • 7
    Electronic Resource
    Electronic Resource
    Crystalline morphology of block-copoly(oxypropylene/oxyethylene/oxypropylene) by small-angle X-ray and Raman scattering (1988)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 189 (1988), S. 459-469 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Block-copoly(oxypropylene/oxyethylene/oxypropylene)s, with central-block lengths of 39 and 75 oxyethylene units and end-block lengths in the range 1 to 13 oxypropylene units, were investigated in their solid states by small-angle X-ray diffraction and low-frequency Raman spectroscopy, supplemented by differential scanning calorimetry. Low-frequency Raman transitions were assigned to longitudinal modes (LAM) of either unfolded or once-folded chains. The solid state comprised stacked monolayer lamellae in which the chains were usually tilted with respect to the lamellar end plane.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1988.021890219
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  • 8
    Electronic Resource
    Electronic Resource
    The origin and early differentiation of the egg chamber of Drosophila melanogasterThis research was supported by the U. S. Public Health Service grants 2-F2-CA-18,847 and GM 9694, the National Science Foundation grant GB 4891, and the American Cancer Society grant E408. The authors wish to express their appreciation to Mrs. Elizabeth T. Stump for her conscientious assistance, and to Mr. E. John Pfiffner for preparation of the inked drawings. (1966)
    New York, NY : Wiley-Blackwell
    Journal of Morphology 119 (1966), S. 283-303 
    Details
    ISSN: 0362-2525
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: The egg chamber of Drosophila melanogaster consists of 16 interconnected cells surrounded by a monolayer of follicle cells. Each 16 cell cluster (from which the oocyte and 15 nurse cells differentiate) arises within the germarial region of an ovariole. To study the ultrastructure of the early stages in the formation and differentiation of egg chambers, a three dimensional reconstruction was made from serial thin sections through a germarium from a 24-hour old, virgin female. The germarium was found to be subdivided into three regions: (1) The mitotically active area where clusters of 16 cells originate from a series of cystocyte divisions, (2) the region where these cells interact with mesodermal cells, and (3) the region where the germarial cyst is transformed into the first egg chamber in the vitellarium. Since cystocytes were found to decrease in size with each division, the possibility exists that cell size may determine when the divisions cease. Models are presented which mimic with varying degrees of success the developmental changes the germarial cells undergo with time. Hypothesis are developed to explain why stem line oogonia are restricted to the anterior portion of the germarium, why mesodermal cells first interact with cystocytes in region 2, and why the oocyte is oriented posteriorly. The nuclear differentiations of the component cells of the chamber are described and correlated with observed differences in radiosensitivity. Symbionts were observed in the germaria of several strains of Drosophila, and the bearing of these findings upon nutritional studies is discussed.
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jmor.1051190303
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  • 9
    Electronic Resource
    Electronic Resource
    A comparative investigation of neuroglia in representative vertebrates: A silver carbonate studyThis investigation was supported by Public Health Service Research grant 1-F1-GM-22,665-01 (Pre-Doctoral fellowship) from the National Institutes of Health and General Research Support Grant 320002 of the United States Public Health Service. (1966)
    New York, NY : Wiley-Blackwell
    Journal of Morphology 119 (1966), S. 435-465 
    Details
    ISSN: 0362-2525
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: The phylogenetic development of neuroglia (astrocytes, oligodendrocytes) was investigated in homologous cortical and subcortical forebrain regions of selected vertebrates. Microglia were not considered in the current study.Four to seven brains from each species were used. Scharenberg's modification for astroglia of del Rio Hortega's silver carbonate technique was used. The analysis of neuroglia cells was based on (1) the characteristic cellular morphology found in each species, (2) a comparison of the selected regions in each animal, (3) the interrelationships of astrocytes and their relations to neurons, blood vessels, and oligodendrocytes.The predominant type of neuroglia found in the fish, frog, and lizard was the ependymal cell; however, non-ependymal glial cells were also present. The bird represented a transitional phylogenetic stage from a predominance of ependymal glial to a predominance of non-ependymal glia. A progressive increase in the morphological relationships of glial cell bodies and processes to neurons was found with ascension of the phylogenetic scale from fish through primate.Interrelations were observed between adjacent astrocytic processes and cell bodies, and between astrocytes and oligodendrocytes. The processes of adjacent glial cells also appeared to show an increase in thickness at the point of approximation. A variety of astrocytes were observed ranging from small, round-oval shaped cells to large polygonal or stellate forms. Variations in the number of astrocytic processes, their thickness, and degree of secondary branching were described, and their possible functional significance was discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jmor.1051190405
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  • 10
    Electronic Resource
    Electronic Resource
    Morphological, ultrastructural, histochemical and electrophoretic studies on the venom system of Nasonia vitripennis walker (hymenoptera: Pteromalidae) (1969)
    New York, NY : Wiley-Blackwell
    Journal of Morphology 127 (1969), S. 177-203 
    Details
    ISSN: 0362-2525
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: The venom system of Nasonia vitripennis is well-developed and composed of an unbranched acid gland and associated reservoir. Fine-structural, histochemical and electrophoretic studies indicate that the venom is produced by two protein-secreting epithelia. The bulk of the venom is synthesised in the columnar cells of the acid gland and discharged via “vesicular organelles” and the efferent ductular system into the lumen of the reservoir. The acid gland also contains squamous chitogenous cells, situated either around the central lumen or interposed between the bases of the columnar cells. Once within the reservoir, the venom is probably activated by enzymatic secretions from the reservoir secretory cells. Each of these cells has a “vesicular organelle” but, in contrast to the columnar cells of the acid gland, the cytoplasm contains a preponderance of free ribosomes, and protein segregation apparently occurs outside the Golgi complexes.The venom is expelled through the efferent discharge duct by muscular contractions, which open the duct lumen and bring it into contact with the funnel of the ovipositor. Excessive distortion of the duct is prevented by a massive ventral ligament.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jmor.1051270205
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