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  • Life and Medical Sciences  (30,791)
  • Analytical Chemistry and Spectroscopy  (25,033)
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  • 1
    Electronic Resource
    Electronic Resource
    Vibrational dephasing of the ν3 mode of liquid allene (1986)
    Chichester [u.a.] : Wiley-Blackwell
    Journal of Raman Spectroscopy 17 (1986), S. 477-480 
    Details
    ISSN: 0377-0486
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The Raman spectrum of the ν3 mode of allene has been studied as a function of temperature throughout the temperature range of the liquid. Analysis of the spectral band shape shows that the vibrational dephasing is a fast-modulation process. Evidence is presented for a vibrational-rotational coupling involving the tumbling reorientation of the molecule. Dilution studies in GeH4 indicated significant resonant vibrational energy transfer.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jrs.1250170610
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  • 2
    Electronic Resource
    Electronic Resource
    Structure of the scales of Dermophis and Microcaecilia (Amphibia: Gymnophiona), and a comparison to dermal ossifications of other vertebrates (1990)
    New York, NY : Wiley-Blackwell
    Journal of Morphology 206 (1990), S. 25-43 
    Details
    ISSN: 0362-2525
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: The structures of the dermal scales and the cells surrounding the scales in two species of gymnophione amphibians were studied using histochemistry and light, scanning and transmission electron microscopy. Scales are composed of a basal platt of several layers of unmineralized collagenous fibers topped with mineralized squamulae. Squamulae are composed of numerous mineralized globules and mineralized, thick collagen fibers. Mineralization is therefore both spheritic and inotropic. Isolated flattened cells lie on the outer surface of the squamulae and seem to be involved in mineral deposition. Cells that line the basal plate synthesize the collagenous stroma of the plate. Each scale lies in a thin connective tissue pocket, and a large connective tissue pouch includes several scales in each annulus.The similarities of gymnophione scales to elasmoid scales of osteichthyans are largely superficial. Aspects of mineralization and of pocket development differ considerably. There are also similarities, as well as differences, in the gymnophione scales and osteoderms of amphibians and of reptiles. We consider that such dermal structures have arisen many times in diverse lineages of vertebrates, and that these are expressions of properties of dermal collagen to support mineralization by specialized dermal cells. However, we recommend that the term “dermal scale” be used for the mineralized dermal units of osteichthyans and gymnophiones, and “osteoderm” for the dermal structures of frogs and squamates, with the understanding that the terminology recognizes certain convergent attributes of shape and structure, but not of process.
    Additional Material: 36 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jmor.1052060104
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  • 3
    Electronic Resource
    Electronic Resource
    Structure of the dermal scales in gymnophiona (Amphibia) (1980)
    New York, NY : Wiley-Blackwell
    Journal of Morphology 165 (1980), S. 41-54 
    Details
    ISSN: 0362-2525
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: Histology and cytology of dermal scales of the gymnophionans Ichthyophis kohtaoensis and Hypogeophis rostratus reveal their structure and the nature of their mineralization.Dermal scales are small flat disks set in pockets in the transverse ridges of the skin. Each pocket contains several scales of various sizes. A ring of “hypomineralization” of varying diameter may occur on scales of a particular dermal pocket but bears no relation to the diameter of these scales.Three different layers form the scales and are seen on sections perpendicular to the surface. The cells of the basal layer lie deepest. Each of the two or three more superficial fibrous layers is composed of bundles of fibres that are oriented in parallel. The orientation varies among layers. The striation of the fiber scales has a periodicity comparable to that of the surrounding dermal fibers. Squamulae form a discontinuous layer on the scale surface and are the only mineralized part of the scale. The minerals are deposited both on the collagen fibers passing from the fibrous layers into the squamulae, and in the interfibrillar spaces. Spherical concretions, either isolated or coalescent, reaching up to 1 μm, are found on the surface of the squamulae.The dermal scales of Gymnophiona present some analogies with those of evolved bony fishes. Their characteristics could make them an original model for the study of mineralization.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jmor.1051650105
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  • 4
    Electronic Resource
    Electronic Resource
    New data on the structure and the growth of the osteoderms in the reptile Anguis fragilis L. (Anguidae, Squamata) (1985)
    New York, NY : Wiley-Blackwell
    Journal of Morphology 186 (1985), S. 327-342 
    Details
    ISSN: 0362-2525
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: Light and electron microscopy shows the osteoderms of Anguis fragilis to be small, flat disks located in the dermis along the adult trunk: microradiography established the extent of the mineralization.Each osteoderm coincides exactly with an epidermal fold forming the keratinized scales characteristic of the skin of reptiles.Sections perpendicular to the surface show two mineralized layers differing in histological and histochemical characteristics and in fine structure, although both contain collagen fibrils. The structure of each layer can be related to that of the surrounding dermis.The outer superficial layer located in the loose dermis contains few collagen bundles that form a discontinuous sheet at the upper surface of the osteoderms. This superficial layer appears to be constituted of units separated by furrows and is composed of woven fibered bone.The basal plate comprises stratified lamellae formed of parallel-oriented collagen fibrils; the fibrils of successive lamellae lie at right angles. The densely packed collagen fibrils of the basal plate are distributed similarly to those of the dense dermis within which it lies. This layer exhibits structural and histochemical characteristics of a lamellar bone.The presence of two different layers in the osteoderms of Anguis fragilis may reflect their mode of formation, which consists of the deposit of mineral crystals in the preexisting dermal tissue. This mineralization process, considered as a “metaplastic ossification,” may reflect the potentiality retained by the dermis of reptiles to form mineralized structures.
    Additional Material: 28 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jmor.1051860309
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  • 5
    Electronic Resource
    Electronic Resource
    Determination of benzene alkyl derivatives in heavily loaded environmental aqueous samples by means of combination of distillation and purge and trap-gas chromatography-mass spectrometry (1997)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 20 (1997), S. 482-486 
    Details
    ISSN: 0935-6304
    Keywords: Volatile benzene alkyl derivatives ; Simple distillation ; Purge and trap ; Capillary gas chromatograph-mass spectrometry ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Simple distillation was used to prepare aqueous environmental samples (especially those with high content of accompanying dissolved and suspended organic and inorganic matter) for determination of benzene, toluene, ethylbenzene, and xylenes (BTEX) by means of purge and trap (PT) coupled to gas chromatography-mass spectrometry (GC-MS). The PT step was carried out with a laboratory-built device in which alalytes desorbed from a Primary trap (macrotrap) are focused in a microtrap (also with sorbent) and moisture is removed from purge gases by a Nafion tube (walls selectively permeable to water vapor). Recoveries, if only the first 10 ml distillate was collected, were of the order of 40% at optimum distillation parameters. At a probability level of 95% recoveries were independent of concentration in a studied concentration range of 0.50-30 ppb. Enrichment factors for distillation were of the order off 20. Real samples, i.e., raw and treated waste water were analyzedc for BTEX content by the developed medthod.
    Additional Material: 5 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240200904
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  • 6
    Electronic Resource
    Electronic Resource
    Television microscopy of sporulation and spore germination of Bacillus cereus (1956)
    Philadelphia : Wiley-Blackwell
    Journal of Cellular and Comparative Physiology 48 (1956), S. 301-316 
    Details
    ISSN: 0095-9898
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jcp.1030480211
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  • 7
    Electronic Resource
    Electronic Resource
    Artenvielfalt und Evolution (1993)
    Weinheim : Wiley-Blackwell
    Biologie in unserer Zeit 23 (1993), S. 308-315 
    Details
    ISSN: 0045-205X
    Keywords: Life and Medical Sciences
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology
    Notes: Die uns auf der Erde umgebende Vielfalt an Organismen-Arten ist eine selbst für den naturwissenschaftlichen Laien auffällige Erscheinung. Als ein wesentliches Merkmal der belebten Natur bietet die Artenvielfalt dem Biologen ergiebige Forschungsfelder. Dennoch wurde die Erscheinung der Artenvielfalt lange von der moderne biologischen Wissenschaft, aber auch im biologischen Uniterricht recht stiefmütterlich behandelt. Erst nachdem in den vergengenen Jahren Biologen und in der Folge der öffentlich- Keit der weltweite Artenschwund bewußt geworden ist, wird dem Phänomen der Artenvielfalt eine verstärkte Aufmerksam- Keit zuteil. Das zeigt sich in der schnellen Einbürgerung des dem Angelsächsischen entlethnten Schlagworts „Biodiversität“ oder in der wachsenden Zahl an Symposien und Schriften, die sich mit der biologischen Vielfalt befassen. Genannt seien hier nur Wilson [14], ein Buch, welches das Problem der Bedrohung der Vielfalt in den VOrdergrund stellt, Groombridge [4], eine umfassende, vom„ world conservation monitoring centre“ erarbeitete Darstellung der „globalen Biodiversität“ oder der von Schulze und Mooney [9] herausgegebene Symposiumsband, in dem von ökologischer Seite die Frage nach den Funktionen der biologischen Vielfalt behandelt wird. Auch die Evolutionsbiologie sucht nach dem Ur-sprung und den hinter der Artenvielfalt stehenden Kräften [3].
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/biuz.960230508
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  • 8
    Electronic Resource
    Electronic Resource
    Innerartliche Kommunikations-systeme bei Bohrfliegen (1974)
    Weinheim : Wiley-Blackwell
    Biologie in unserer Zeit 4 (1974), S. 146-153 
    Details
    ISSN: 0045-205X
    Keywords: Life and Medical Sciences
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/biuz.19740040504
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  • 9
    Electronic Resource
    Electronic Resource
    Artenvielfalt und Evolution (1993)
    Weinheim : Wiley-Blackwell
    Biologie in unserer Zeit 23 (1993), S. 308-315 
    Details
    ISSN: 0045-205X
    Keywords: Life and Medical Sciences
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology
    Notes: Die uns auf der Erde umgebende Vielfalt an Organismen-Arten ist eine selbst für den naturwissenschaftlichen Laien auffällige Erscheinung. Als ein wesentliches Merkmal der belebten Natur bietet die Artenvielfalt dem Biologen ergiebige Forschungsfelder. Dennoch wurde die Erscheinung der Artenvielfalt lange von der moderne biologischen Wissenschaft, aber auch im biologischen Unterricht recht stiefmütterlich behandelt. Erst nachdem in den vergangenen Jahren Biologen und in der Folge der öffentlich-keit der weltweite Artenschwund bewußt geworden ist, wird dem Phänomen der Artenvielfalt eine verstärkte Aufmerksam- Keit zuteil. Das zeigt sich in der schnellen Einbürgerung des dem Angelsächsischen entlehnten Schlagworts „Biodiversität“ oder in der wachsenden Zahl an Symposien und Schriften, die sich mit der biologischen Vielfalt befassen. Genannt seien hier nur Wilson [14], ein Buch, welches das Problem der Bedrohung der Vielfalt in den Vordergrund stellt, Groombridge [4], eine umfassende, vom„ world conservation monitoring centre“ erarbeitete Darstellung der „globalen Biodiversität“ oder der von Schulze und Mooney [9] herausgegebene Symposiumsband, in dem von ökologischer Seite die Frage nach den Funktionen der.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/biuz.19930230508
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  • 10
    Electronic Resource
    Electronic Resource
    An energy-resolved study of the fragmentation of ionized 1-Penten-3-ol (1984)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 19 (1984), S. 573-576 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A detailed energy-resolved study of the fragmentation of CH2=CHCH(OH)CD2CD3 (1-d5) has been carried out using metastable ion studies and charge exchange techniques, combined with collision-induced dissociation studies to establish the structures of fragment ions. At low internal energies (metastable ions) the molecular ion of 1-d5 rearranges to the 3-pentanone structure and fragments by loss of C2H5 or C2D5 leading to the acyl structure, [CH3CH2C≡O]+ or [CD3CD2C≡O]+, for the fragment ion. However, with increasing internal energy of the molecular ion this rearrangement process decreases rapidly in importance and loss of C2D5 by direct cleavage, leading to [CH2=CHCH=OH]+, becomes the dominant fragmentation reaction. As a result the [C3H5O]+ ion seen in the electron impact mass spectrum of 1-penten-3-ol has predominantly the protonated acrolein structure.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210191109
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