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  • 1
    Electronic Resource
    Electronic Resource
    Free amino acids and osmoregulation in penaeid shrimp (1975)
    s.l. : American Chemical Society
    Journal of agricultural and food chemistry 23 (1975), S. 1172-1174 
    Details
    ISSN: 1520-5118
    Source: ACS Legacy Archives
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/jf60202a015
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  • 2
    Electronic Resource
    Electronic Resource
    Anodic oxidation of zircaloy-2 (1976)
    Springer
    Journal of applied electrochemistry 6 (1976), S. 293-299 
    Details
    ISSN: 1572-8838
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Electrical Engineering, Measurement and Control Technology
    Notes: Abstract The anodic polarization of zircaloy-2 in different electrolytic baths has been investigated in order to obtain thick oxide films with properties suitable for wear applications. The operative conditions to obtain hard, thick, compact oxide films resistant to thermal shocks have been determined. The influence of the bath composition and temperature on the oxide growth is reported.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00608914
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  • 3
    Electronic Resource
    Electronic Resource
    Organochlorine insecticide residues in red-legged partridge (1978)
    Springer
    Bulletin of environmental contamination and toxicology 19 (1978), S. 697-702 
    Details
    ISSN: 1432-0800
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01685860
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  • 4
    Electronic Resource
    Electronic Resource
    The Hodge conjecture for fourfolds admitting a covering by rational curves (1978)
    Springer
    Mathematische Annalen 238 (1978), S. 79-88 
    Details
    ISSN: 1432-1807
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01351457
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  • 5
    Electronic Resource
    Electronic Resource
    Correlated changes in the structure of the anterior pituitary gland, testes and interrenal tissue during sexual maturation of male lizards (1975)
    Springer
    Cell & tissue research 157 (1975), S. 493-502 
    Details
    ISSN: 1432-0878
    Keywords: Anterior hypophysis ; Adrenal cortex ; Testis-Reptiles ; Sexual maturation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The anterior pituitary gland, testes and interrenal glands of a series of young males of the teiid Cnemidophorus l. lemniscatus (L.) have been studied by light microscopy in order to correlate the changes occurring during sexual maturation. In the testes of the smallest animals, spermatogenesis does not progress beyond primary spermatocytes and there is no differentiated interstitial tissue. In medium-sized animals, spermatids and some interstitial cells appear, and in the largest lizards, spermatogenesis is completely established and Leydig cells abound. Simultaneously with the development of the testes, interrenal glands undergo great hypertrophy and hyperplasia, especially in the peripheral reactive zone. Starting in animals of intermediate size, the anterior hypophysis exhibits a considerable hypertrophy of two rostral cell types: the chromophobic corticotrophs and the acidophilic PAS-positive cells considered to be interstitiotrophs. These cells show large, vesicular nuclei and prominent nucleoli, signs of enhanced cellular activity. The hypertrophy begins in the dorso-rostral region of the gland close to the median eminence, at the site of entry of the portal vessels. This suggests a hypothalamic influence on the function of these pars distalis cells. The scattered basophilic gonadotrophs or folliculotrophs are scarce, small, and do not vary appreciably among the animals studied. The hyperactivity of corticotrophs may account for enlargement of the interrenal glands. Testicular development is apparently related to an increased activity of interstitiotrophs but to a stable level of activity in folliculotrophs.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00222601
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  • 6
    Electronic Resource
    Electronic Resource
    The subacrosomal granule and its evolution during spermiogenesis in a lizard (1976)
    Springer
    Cell & tissue research 171 (1976), S. 483-498 
    Details
    ISSN: 1432-0878
    Keywords: Spermiogenesis ; Subacrosomal structures ; Acrosome ; Sertoli cell ; Lizard
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Some aspects of spermiogenesis have been studied in the testis of the teiid lizard Cnemidophorus lemniscatus lemniscatus by electron microscopy. Shortly after the acrosomal vesicle is lodged in a nuclear concavity of the spermatid, a dense granule differentiates in the center of the subacrosomal space. It is cone-shaped and shows a longitudinal striation. Its base applies to the acrosomal membrane and, through this, to the acrosomal granule. Its rounded vertex causes a depression of the nuclear membranes which, initially juxtaposed, separates at this point to form a vesicle. The granule develops and becomes a rod when spermiogenesis is advanced and the subacrosomal space has taken the form of a secondary cap. The rod is cylindrical, retains its original striation and has a convex acrosomal end. It encloses the vesicle formed by the nuclear envelope in its base and follows the apex of the nucleus. Meanwhile, the acrosomal granule loses its identity and the acrosomal cap is filled with a dense substance, in which a fringe of translucent material differentiates. This fringe lies in the dorsal and apical margins of the acrosome and is incompletely divided by longitudinal crests of the dense acrosomal substance. A projection of the Sertoli cell forms an accessory cap which envelops the acrosome and is in turn covered by the cytoplasm of the spermatid, constituting an intricate association. Two reflex membranes underlie the plasmalemma in the outer surface of the projection of the Sertoli cell. They are continuous with one another at their ends and with the cell membrane in the edge of pores. In the peripheral cytoplasm of the spermatid facing the accessory cap, numerous microtubules run longitudinally. By means of thin membranes some are interconnected or connected with the plasmalemma, from which they seem to originate.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00220240
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  • 7
    Electronic Resource
    Electronic Resource
    Functional morphology of the neck organ in Artemia salina nauplii (1975)
    New York, NY : Wiley-Blackwell
    Journal of Morphology 145 (1975), S. 371-385 
    Details
    ISSN: 0362-2525
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: Fine structure of the ion transporting epithelium of the neck organ in the brine shrimp (Artemia salina) nauplius is described. The neck organ is a dome-like gland situated atop the cephalothorax of the larva and is composed of 50 to 60 cuboidal epithelial cells. These cells possess many of the characteristics of salt-secretory cells from other tissues. They contain many mitochondria and exhibit a high degree of plasma membrane elaboration. This membrane amplification takes two forms; the apical plasmalemma is infolded into irregular loops, while the basal and lateral membranes penetrate the cytoplasm in the form of branching sinusoids. The labyrinth of tubular reticulum thus formed fills most of the cell volume. Mitochondria in the labyrinth are often in intimate contact with these tubular membranes and regular arrays of parallel mitochondria with constricted intervening sinusoids are often observed. Other organelles including Golgi complexes, multivesicular bodies, and rough endoplasmic reticulum are also numerous, particularly in the narrow rim of cytoplasm which lies between the apical infolds and the labyrinth. Yolk platelets and glycogen fields are conspicuous in the basal perinuclear regions of the cells.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jmor.1051450309
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  • 8
    Electronic Resource
    Electronic Resource
    An x-ray and conformational study of Kapton H (1976)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Physics Edition 14 (1976), S. 1553-1560 
    Details
    ISSN: 0098-1273
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Potential energy calculations were performed on the isolated chain of Kapton H (KH) in order to obtain information on the most probable conformations. A model with a C—O—C angle of 130° and with the segments joining the ether oxygens forming a planar zigzag chain satisfactorily fits the x-ray experimental data. Although the equatorial reflections are very few and diffuse, it seems likely that the space group is P21 and the unit cell parameters are a = 4.66 Å, b = 32.9 Å, c = 5.96 Å, β = 100°. The observed density is in agreement with two monomers in the unit cell. An intrachain vector distribution map was computed by rotating (angle θ) the pyromellitic acid dimide (DIPA) unit about the N—C bond in the KH monomer. This map was compared with a one-dimensional Patterson synthesis calculated along b, the fiber axis, to establish the value of θ. Van der Waals' energy calculations were subsequently accomplished in the crystal as a function of θ and of the rotation around the helical axis of the KH chains. The results allowed us to choose a reasonable macromolecular conformation and packing in the crystal. KH is mainly ordered along the fiber axis but shows little order in the packing of adjacent helixes. The macromolecules are held together by Van der Waals' and, probably, by charge-transfer forces.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1976.180140902
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  • 9
    Electronic Resource
    Electronic Resource
    Chain folding in crystalline syndiotactic poly(vinyl chloride) (1979)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Physics Edition 17 (1979), S. 753-762 
    Details
    ISSN: 0098-1273
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Potential-energy calculations seem to be capable of providing information about the structural characteristics of the folds in crystalline polymers. This paper deals with the conformational analysis of syndiotactic poly(vinyl chloride) (PVC) chains in order to reproduce satisfactory models of folding in the (010), (400), and (M̄10) crystallographic planes. The results imply that tight (010) and (400) folds and, hence, adjacent reentry may occur. The folds are probably stabilized by a weak hydrogen-bond type of interaction. Moreover —CHCl—CH2—CH2—CHCl— segments in the folds have been taken into account, thus obtaining more energetically favored models. The crystal lattice energy has been computed as a function of the PVC unit-cell parameters a and b, releasing the fold's constraint of the stems. The energy minimum corresponds to a noticeable decrease of a in comparison with the experimental value, although the potentials used in the calculations are hard and have van der Waals radii greater than those usually accepted. As a consequence it seems reasonable to suppose that the folds strongly influence the PVC crystal packing and do not allow better interatomic contacts between stems to form.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1979.180170503
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  • 10
    Electronic Resource
    Electronic Resource
    Potential energy calculations of ethylene-butadiene copolymers (1975)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Chemistry Edition 13 (1975), S. 125-131 
    Details
    ISSN: 0360-6376
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The copolymer ethylene-butadiene (PEBU) was investigated by van der Waals potential energy calculations as a function of four internal rotation angles. The butadiene/ethylene molar ratio was assumed to be very small, no greater than 0.25. The energy values corresponding to the fully extended chain of PEBU and polyethylene (PE) are nearly equal, so that the replacement of a —H2C—CH2— unit with the trans —HC=CH— group (TDB) in PE crystals can be considered feasible, as found by x-ray diffraction measurements. The three deepest minima of the van der Wals energy correspond to folded chains, with the double bonds lying in the fold parts. Similar calculations carried out on a PE chain point out that TDB behaves as fold-supporting. The two energetically more favorable conformations of PEBU reproduce rather well the (110) and (200) folds in PE crystals. The path of the (110) → (200) transition does not appear to be hindered by a large potential barrier. If the —HC=CH— group is in the cis conformation, no stable folded chain can be obtained by means of only four intramolecular degrees of freedom. On the basis of these results it is reasonable to suppose that many TDB's could be located on the surface of PEBU single crystals.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1975.170130113
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