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  • Life and Medical Sciences  (7)
  • Wiley-Blackwell  (7)
  • 1985-1989  (7)
  • 1
    Electronic Resource
    Electronic Resource
    On the Image-Contrast Characteristics of Strains, Surface Rugosity, and Defects in Small Metallic Particles (1987)
    New York, NY : Wiley-Blackwell
    Journal of Electron Microscopy Technique 6 (1987), S. 367-376 
    Details
    ISSN: 0741-0581
    Keywords: Stacking faults ; Dynamical theory calculations ; Digital image processing ; Weak beam images ; Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Natural Sciences in General
    Notes: An analysis of the effects of strain and surface roughness on the contrast of weak beam images of small metallic particles is carried out. in order to study these effects, theoretical calculations of the intensity obtained in wedge-shaped bent gold crystals were performed. These calculations were based on the standard form (Bethe's approach) of the dynamical theory. The theoretical results were compared with weak beam experimental images of gold particles. It was found that the image contrast obtained in thin crystalline regions is not sensitive to strain. Therefore, intensity variations experimentally obtained in these regions seem more likely to be related to the surface roughness of the crystalline specimen. We also studied (experimentally and theoretically) the image-contrast characteristics of stacking faults in small particles. The comparison between the experimental micrographs and the theoretical images suggests a possible model of the small particle shape. This model seems to explain most of the experimentally observed image-contrast characteristics.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jemt.1060060407
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  • 2
    Electronic Resource
    Electronic Resource
    Anterior dorsal ventricular ridge in the lizard: Embryonic development (1987)
    New York, NY : Wiley-Blackwell
    Journal of Morphology 194 (1987), S. 55-64 
    Details
    ISSN: 0362-2525
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: In lacertids the telencephalic vesicle starts its development at stage E = 30, at which time it is lined by a homogeneous nucleated zone in which particular ventricular zone territories or sulci cannot be distinguished. At stage E = 32 coinciding with the initial development of the anterior dorsal ventricular ridge (ADVR), one may distinguish the ventricular zone b in the dorsolateral wall of the ventricle adjacent to the sulcus lateralis. The ADVR continues growing by incorporation of cells produced in two proliferative zones (zone b and wall of the sulcus lateralis) and appears fully developed in postnatal lizards. Ultrastructural characteristics of young ADVR neurons between stages E-32 and E-33 are typical of those in immature cells. Beginning at stage E-34, some of these neurons appear to be degenerating (pycnotic). Thereafter, neurons of the ADVR develop abundant cytoplasmic organelles and the neuropile grows quickly. Myelination starts in the ADVR between stages E-38 and E-40, but is not observed in other striatal masses in the same period. Vascularization begins and is well developed at E-40. The first synaptic contacts were observed in embryos of stage E=38; they are chiefly axo-dendritic, although some are axo-somatic. Degenerating neurons were found in the ADVR up to hatching. From stage E-40 onward, the ADVR shows a greater and more rapid differentiation than all other striatal nuclei, including the ventral and amygdaloid complex.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jmor.1051940105
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  • 3
    Electronic Resource
    Electronic Resource
    Binding properties of biotinylated epidermal growth factor to its receptor on cultured cells and tissue sections (1989)
    New York, N.Y. : Wiley-Blackwell
    Journal of Cellular Biochemistry 41 (1989), S. 47-56 
    Details
    ISSN: 0730-2312
    Keywords: EGF derivative ; EGF receptor ; cytochemical detection ; clinical oncology ; tumor marker ; Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Notes: A biotinylated derivative of murine epidermal growth factor (EGF) was prepared by covalent attachment of the terminal amino group of EGF to N-biotinyl-ε-aminocaproyl-N-hydroxysuccinimide. The stoichiometry of biotin incorporation was in the range of one biotin moiety per EGF molecule. The biotinylated EGF (biotinyl-ε-caproyl-EGF, BioEGF) binds to EGF receptors on intact Ehrlich ascites carcinoma (EAC) cells with an affinity similar to that of native EGF and displays the same mitogenic activity as EGF in a soft agar test system with normal rat kidney (NRK) cells. BioEGF was visualized on cultured cells and tissue sections of a head and neck tumour by commercial streptavidin/avidin detection systems. Cytochemical analyses of certain tumour forms can be easily performed using the BioEGF probe.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jcb.240410202
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  • 4
    Electronic Resource
    Electronic Resource
    Calmodulin plays a dominant role in determining neurotransmitter regulation of neuronal adenylate cyclase (1988)
    New York, N.Y. : Wiley-Blackwell
    Journal of Cellular Biochemistry 36 (1988), S. 417-427 
    Details
    ISSN: 0730-2312
    Keywords: rat brain ; hormones ; calcium ; cAMP ; Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Notes: Ca2+, through the mediation of calmodulin, stimulates the activity of brain adenylate cyclase. The growing awareness that fluctuating Ca2+, concentrations play a major role in intracellular signalling prompted the present study, which aimed to investigate the implications for neurotransmitter (receptor) regulation of enzymatic activity of this calmodulin regulation. The role of Ca2+/calmodulin in regulating neurotransmitter-mediated inhibition and stimulation was assessed in a number of rat brain areas. Ca2+/calmodulin stimulated adenylate cyclase activity in EGTA-washed plasma preparations from each region studied - from 1.3-fold (in striatum) to 3.4-fold (in cerebral cortex). The fold-stimulation produced by Ca2+/calmodulin was decreased in the presence of GTP, forskolin, or Mn2+. In EGTA-washed membranes, receptor-mediated inhibition of adenylate cyclase was strictly dependent upon Ca2+/calmodulin stimulation in all regions, except striatum. A requirement for Mg2+ in combination with Ca2+/calmodulin to observe neurotransmitter-mediated inhibition was also observed. In contrast, receptor-mediated stimulation of activity was much greater in the absence of Ca2+/calmodulin. The findings demonstrate that ambient Ca2+ concentrations, in concert with endogenous calmodulin, may play a central role in dictating whether inhibition or stimulation of adenylate cyclase by neurotransmitters may proceed.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jcb.240360410
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  • 5
    Electronic Resource
    Electronic Resource
    Binding of chemotactic peptide to the outer surface and to whole human spermatozoa with different affinity states (1988)
    New York, NY : Wiley-Blackwell
    Gamete Research 20 (1988), S. 233-239 
    Details
    ISSN: 0148-7280
    Keywords: human sperm ; membrane ; receptors ; Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology
    Notes: Binding of N-formyl-methionyl-L-leucyl-[3H]phenylalanine (fML[3H]Ph) to human ejaculated spermatozoa and to its isolated plasma membrane was studied. Our data confirm the presence of specific receptors for f-MLPh in the human spermatozoa and suggest that whole spermatozoa receptors exist in two affinity states, one high-affinity, low-capacity specific receptor (Kd = 12.3 ± 0.5 nM, n = 22,285 ± 65,008 binding sites per sperm cell) and a second one (Kd = 700 ± 47 nM) that is not saturable, indicating a low-affinity, high-capacity nonspecific site. In contrast, sperm membrane showed only one class of binding site (Kd = 6.4 ± 0.12 nM), which was statistically different from that of the high-affinity binding site of intact spermatozoa. To explain this difference we discuss the possibility that first, the two binding affinities represent two interconvertible states of a single receptor population, which, depending on the metabolic activity of spermatozoa, may change its physicochemical properties; or second, they reflect two different processes, binding and/or transport into the spermatozoa.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrd.1120200213
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  • 6
    Electronic Resource
    Electronic Resource
    Chromatin structure of yeast genes (1989)
    New York, NY [u.a.] : Wiley-Blackwell
    Yeast 5 (1989), S. 219-238 
    Details
    ISSN: 0749-503X
    Keywords: Life and Medical Sciences ; Genetics
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/yea.320050404
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  • 7
    Electronic Resource
    Electronic Resource
    Electron crystallography of linear polysaccharides (1989)
    New York, NY : Wiley-Blackwell
    Journal of Electron Microscopy Technique 11 (1989), S. 280-285 
    Details
    ISSN: 0741-0581
    Keywords: Electron diffraction ; Molecular modeling ; Polysaccharides ; Crystal structure ; Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Natural Sciences in General
    Notes: The present article illustrates how the use of electron diffraction data coupled with realistic molecular modeling can yield to unambiguous structural elucidation of linear polysaccharides in the crystalline state. The series of the original ab initio quantitative crystal structure analyses is presented, along with a description of the methods. Pertinent examples showing the unique ability and utility of electron crystallography to yield new structural insights for biologically interesting macromolecules are given.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jemt.1060110407
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