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  • 1
    Electronic Resource
    Electronic Resource
    Effects of Cd++ on short-circuit current across epithelial membranes (1976)
    Springer
    The journal of membrane biology 26 (1976), S. 109-119 
    Details
    ISSN: 1432-1424
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Summary Cadmium ion (Cd++) significantly increased potential difference (PD) and short-circuit current (SCC) across isolated frog skin when added to the outside Ringer's solution at 10−4, 10−3 and 5×10−3 m concentration. Resistance was reduced by 10−4 m Cd++ but not significantly changed by the higher concentrations. When SCC was first stimulated by vasopressin, 10−4 and 10−3 m Cd++ produced additive stimulation which was reversible by washing with Cd++-free Ringer's. If SCC was first stimulated by Cd++, further stimulation by vasopressin was additive with 10−4 m Cd++ but completely inhibited by 10−3 m Cd++. Elevating the calcium ion (Ca++) concentration of the outer Ringer's from 10−3 m to 5×10−3 m or 10−2 m prior to Cd++ treatment did not reduce the magnitude of SCC stimulation by Cd++. Removal of Ca++ from the outside Ringer's with 2×10−3 m EDTA increased SCC as predicted. Subsequent addition of 5×10−3 m Cd++ drastically reduced SCC below control levels while equimolar concentrations of Cd++ and EDTA reduced SCC only to control levels. These results suggest that Cd++ interacts with the components of the apical plasma membranes of epithelial cells which are associated with the stimulation of SCC by vasopressin and Ca++ removal and may be a useful probe for elucidating these components.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01868869
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  • 2
    Electronic Resource
    Electronic Resource
    Photoperiodic determination of insect development and diapause (1976)
    Springer
    Journal of comparative physiology 105 (1976), S. 267-277 
    Details
    ISSN: 1432-1351
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The Dual System Theory of photoperiodic determination was found to be consistent with experimental data on diapause induction in response to skeleton photoperiods. Symmetrical and asymmetrical skeleton photoperiods of both diel and nondiel durations were investigated. The theoretical model was shown to predict accurately the incidence of diapause among larvae of the European corn borer,Ostrinia nubilalis, that had been reared under the different photoperiodic regimes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01379287
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  • 3
    Electronic Resource
    Electronic Resource
    Changes in sensitivity of morphine-induced circling behaviour after chronic treatment and persistence after withdrawal in rats (1976)
    [s.l.] : Nature Publishing Group
    Nature 260 (1976), S. 159-161 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The subjects were naive female Sprague?Dawley rats weighing approximately 260 g. For measuring rotation, rats were placed individually in a completely automated rotometer16 which differentiates between complete 360 rotations and incomplete oscillatory turns. After habituation for 15 min each rat ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/260159a0
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  • 4
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    Robert W. Fogel and Stanley L. Engerman, "Evidence and Methods: A Supplement" (Book Review) (1976)
    London : Periodicals Archive Online (PAO)
    Journal of historical geography. 2:3 (1976:July) 262 
    Details
    ISSN: 0305-7488
    Topics: Geography
    Description / Table of Contents: The Americas
    Notes: Reviews
    URL: http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&res_dat=xri:pao:&rft_dat=xri:pao:article:h349-1976-002-03-000019
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  • 5
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    Robert W. Fogel and Stanley L. Engerman, "Time on the Cross: The Economics of American Negro Slavery" (Book Review) (1976)
    London : Periodicals Archive Online (PAO)
    Journal of historical geography. 2:3 (1976:July) 262 
    Details
    ISSN: 0305-7488
    Topics: Geography
    Description / Table of Contents: The Americas
    Notes: Reviews
    URL: http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&res_dat=xri:pao:&rft_dat=xri:pao:article:h349-1976-002-03-000018
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  • 6
    Electronic Resource
    Electronic Resource
    Photoperiodic determination of insect development and diapause (1976)
    Springer
    Journal of comparative physiology 107 (1976), S. 97-111 
    Details
    ISSN: 1432-1351
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The Dual System Theory of photoperiodic time measurement is shown to provide a satisfactory basis for the interpretation of: (1) photoperiodic determination of diapause; (2) effects of different photoperiodic regimes on circadian rhythms of adult eclosion; and (3) the phase response curve. A fundamental unity of photoperiodic time measurement in a wide variety of organisms is strongly suggested by the Dual System Theory.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00663921
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  • 7
    Electronic Resource
    Electronic Resource
    Drug-induced rotation in rats without lesions: Behavioral and neurochemical indices of a normal asymmetry in nigro-striatal function (1976)
    Springer
    Psychopharmacology 47 (1976), S. 249-260 
    Details
    ISSN: 1432-2072
    Keywords: Rotation ; d-Amphetamine ; Apomorphine ; Scopolamine ; L-Dopa ; Haloperidol
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Normal unoperated rats were tested for rotation (i.e., circling behavior) in a spherical “rotometer” and dose-response relationships were generated using d-amphetamine, apomorphine, L-Dopa, haloperidol, and scopolamine. The rotation induced by amphetamine was significantly antagonized by alphamethyl-p-tyrosine and haloperidol, but not by diethyl-dithiocarbamate. The rotation elicited by apomorphine was unaffected by alpha-methyl-p-tyrosine. Rotation was not necessarily in the same direction with high and low doses of amphetamine, or amphetamine and apomorphine administered a week apart from each other. Dopaminergic-cholinergic interactions were evident, since pilocarpine antagonized amphetamine-induced rotation whereas scopolamine did not; scopolamine elicited rotation in the same direction as that induced by amphetamine. Left and right striatal dopamine and tel-diencephalic norepinephrine levels were determined in rats injected with various doses of amphetamine and tested for rotation. There were significant bilateral differences in striatal dopamine which were related to the direction of rotation. Since amphetamine was found to be equally distributed to the two sides of the brain, the difference in striatal dopamine appeared to be the neurochemical substrate for rotation in normal rats. These results suggest that normal rats have asymmetrical levels of striatal dopamine as well as an asymmetrical complement of striatal dopamine receptors.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00427609
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  • 8
    Electronic Resource
    Electronic Resource
    Stress dependence of the Fermi surface of antiferromagnetic chromium (1976)
    Springer
    Journal of low temperature physics 25 (1976), S. 771-792 
    Details
    ISSN: 1573-7357
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The uniaxial stress dependence of extremal cross sections of the Fermi surface of antiferromagnetic chromium has been determined by simultaneously measuring the oscillatory magnetostriction and the de Haas-van Alphen torque. The stress dependence data permit identification of a set of pseudoharmonic frequency branches as resulting from magnetic breakdown between the intersecting hole ellipsoids, which are obtained by remapping the Fermi surface of paramagnetic chromium to include the magnetic band gaps produced by the spin density wave of wave vectorQ incommensurate with the lattice. The stress dependence ofQ is very small, an unexpected result in view of the strong stress dependence of the Néel temperature. The stress dependence of the Fermi surface of paramagnetic chromium thus dominates the behavior, and is found to resemble closely that of the other group VI metals.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00657298
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  • 9
    Electronic Resource
    Electronic Resource
    The large pigment cell of the compound eye of the house fly Musca domestica (1976)
    Springer
    Cell & tissue research 170 (1976), S. 77-88 
    Details
    ISSN: 1432-0878
    Keywords: Compound eye ; House fly ; Large pigment cells ; Corneal pigment cells ; High voltage and conventional electron microscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The fine structure and cellular associations of the large pigment cells (LPC's) of the compound eye of the house fly were studied with high voltage and conventional electron microscopy. Depending on the sector of the compound eye, the facets are either rectangular or hexagonal. The underside of each facet has indentations exactly aligned with those on top into which inserts an angulated sleeve of LPC's. Under the rectangular lens facet 6 or 8 small compact (in cross section) LPC's join four elongate LPC's. Clusters of compact cells alternate in this ring with elongate ones. Compact cells compress together and become quadrangular (in cross section) several microns below their insertion into the lens and form “building block” corners while elongate cells form “side rails” for the rectangular type of distal pseudocone enclosure. Beneath hexagonal facets all LPC's are rather elongate with out corner cells. In both facet types LPC's enclose the pseudocone for a longitudinal distance of 4 μm and then are displaced as bordering cells by a sleeve of two corneal pigment cells (CPC's), each of which encloses half of the proximal pseudocone. For the following 6 μm of longitudinal distance these concentric sleeves of CPC's and LPC's form a double layer around the pseudocone. At about 10 μm below lens base the two sleeves separate; LPC's become attenuated and extend cable-like to the basement membrane and CPC's enclose the proximal pseudocone, Semper cells and distal retinula. The junction between lens and LPC's has critical structural value in that (1) this is the sole anchorage to the lens by the lengthy remainder of the ommatidium, and (2) LPC's enclose the semiliquid pseudocone in the most distal portion of the pseudocone. In addition to vertical support, the LPC's send out numerous lateral processes that make structural contact among themselves, with the corneal pigment cells and the photoreceptor cells. The structural features of this array are discussed relative to possible physiological roles.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00220111
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  • 10
    Electronic Resource
    Electronic Resource
    The housefly interfacetal hair (1976)
    Springer
    Cell & tissue research 166 (1976), S. 353-363 
    Details
    ISSN: 1432-0878
    Keywords: Musca domestica ; Interfacetal hair ; Mechanoreceptor, microtubules ; Bipolar neuron ; Scanning and transmission electron microscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The external and internal fine structure of the housefly interfacetal hair and its sensory dendrite was studied with the scanning and transmission (high and low voltage) electron microscopes. The hair shaft contains no dendrites, and is usually situated within a socket on the lens surface. Immediately beneath and directly connected to the base of each hair is a bipolar neuron whose dendrite tip is enveloped in a sheath cell which, in turn, is surrounded by a second sheath cell. Septate junctions are seen between all these cells and contiguous portions of a large pigment cell. At the hair base, the dendrite of the neuron terminates in a tubular body only 1.5 μm in diameter which is filled with about 400 microtubules in highly ordered (in parallel pentagonal and hexagonal) arrays and whose sides are fused to neurofilaments in parallel. Another filament (ca. 70 Å diameter) is in the center of each microtubule-neurofilament polygon. Structures proximal to the tubular body are typical for a scolopoid sensillum, i.e., connecting cilium (9×2+0 microtubules) with rootlet and basal bodies, unmodified dendrite, perikaryon and axon. The axon has not been traced to its synapse. The high degree of internal organization and shortness of the tubular body, as well as its eccentric insertion into the hair shaft lead to the hypothesis that this hair may be a highly sensitive mechanoreceptor. On the basis of their single innervation, these hairs could monitor flight speed from the degree of hair deflection caused by wind in general or particular laminar air currents flowing past the eyes during flight.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00220131
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