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  • 1
    Electronic Resource
    Electronic Resource
    Ultrastructure of the crocodile kidney (Crocodylus acutus) with special reference to electrolyte and fluid transportThis work was supported by grant AM09975-02 from the National Institutes of Health, Bethesda, Maryland. (1967)
    New York, NY : Wiley-Blackwell
    Journal of Morphology 121 (1967), S. 255-276 
    Details
    ISSN: 0362-2525
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: The study of the ultrastructure of the kidney tubules of the crocodile was made to compare the cellular structure with the capacity for electrolyte resorption and the ability to create an osmotic gradient across the tubular wall. The crocodile tubular cells were found to differ from the mammalian tubular cells in that they do not have basal infoldings, but instead have open lateral spaces between the cells, similar in many aspects to those found in the mammalian gallbladder. The physiological role of these lateral spaces in solute and fluid transfer is discussed.
    Additional Material: 14 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jmor.1051210402
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  • 2
    Electronic Resource
    Electronic Resource
    Mean weights of chick embryos correlated with the stages of Hamburger and Hamilton (1968)
    New York, NY : Wiley-Blackwell
    Journal of Morphology 124 (1968), S. 79-82 
    Details
    ISSN: 0362-2525
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: A total of 1125 normal chick embryos, representing 25 each of the 45 stages of Hamburger and Hamilton, were removed, fixed in Bouin's solution, stored in 70% ethanol and weighed with a semi-micro analytical balance. Entire blastoderms of stages 1-8 were weighed, whereas only embryos-proper were weighed in stages 9-45. As a consequence, results constituted two groups, each of which showed a geometric rate of growth marked only by minor deviations which were related to specific events of normal growth and development.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jmor.1051240105
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  • 3
    Electronic Resource
    Electronic Resource
    The fine structure of the Limulus optic nerve (1968)
    New York, NY : Wiley-Blackwell
    Journal of Morphology 125 (1968), S. 61-70 
    Details
    ISSN: 0362-2525
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: Two complete composite photographs of the optic nerve of Limulus, made by electron microscopy, reveal the presence of neurosecretory granules in the large axons of the rudimentary eye neurons. The number of intermediate sized, (3-7 μ), of eccentric cells corresponds with the number of ommatidia as expected, but only their sheath of Schwann cells show an intimate interfolding. Based on the number of fine axons within the nerve each ommatidium has an average of 12-13 retinular cells. The diameter of their fibers is between 0.2 and 3 μ although the majority are between 1 and 1.5 μ. They are aggregated into bundles of six to seven fibers by the sheath cells although some bundles contain only two, others as many as 181 fibers. There is no indication in these studies that retinular cell axons within a bundle are associated with the same, adjacent, or other pattern of ommatidia. The photographs suggest that physiological activity in retinular cell axons might be detected most easily in the smallest bundles because they contain the fewest, but the larger retinular cell axons.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jmor.1051250104
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  • 4
    Electronic Resource
    Electronic Resource
    A histological and ultrastructural study of germinal differentiation of interstitial cells arising from gland cells in Hydra viridis (1966)
    New York, NY : Wiley-Blackwell
    Journal of Morphology 120 (1966), S. 1-8 
    Details
    ISSN: 0362-2525
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: Gland cells of the gastrodermis of Hydra when isolated from the epidermis are capable of dedifferentiating into interstitial cells. Under proper environmental conditions these interstitial cells are capable of undergoing meiotic divisions and forming normal gametes. This dedifferentiation and redifferentiation sequence has been studied at the level of the light and electron microscope. It is concluded that in Hydra there is no specific germinal cell line determined during embryogeny, and that a somatic cell under proper environmental conditions can be induced to undergo meiosis.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jmor.1051200102
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  • 5
    Electronic Resource
    Electronic Resource
    Excretion and ultrastructure of the antennal gland of the fiddler crab Uca mordaxThis work was supported by grant AMO 9975-01 of the National Institutes of Health, Bethesda, Maryland. (1968)
    New York, NY : Wiley-Blackwell
    Journal of Morphology 125 (1968), S. 473-495 
    Details
    ISSN: 0362-2525
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: Function and ultrastructure of the excretory organs (antennal glands) of the shore crab Uca mordax were investigated. The crabs were maintained at three different salinities: 50%, 100% and 200% seawater. In spite of previous reports to the contrary, the investigation showed that the powerful osmoregulatory ability found in Uca mordax is not due to participation of the antennal glands. Freezing point depression of urine under all conditions was found to be slightly less than that of the hemolymph, indicating a slightly hypoosmotic urine. It was further found that the antennal gland is extremely effective in resorbing sodium from the filtrate. The higher the salinity to which the crabs were acclimated the lower the sodium concentration in the urine. No water was resorbed from the filtrate as shown by the fact that the inulin U/P ratio remained unity regardless of the salinity to which the crabs were adapted. Electronmicroscopy of the antennal glands revealed that the coelomosac cells are similar to the podocytes described in the crayfish by Kümmel ('64), and the coelomosac appears to be a typical filtration organ. The cells of the labyrinth showed brush border and very elaborate basal infoldings with numerous mitochondria. The deep cytoplasmic infoldings which represent interdigitations with neighboring cells may be correlated with the effective sodium reabsorption in the labyrinth, but apparently not with water movement.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jmor.1051250406
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  • 6
    Electronic Resource
    Electronic Resource
    Deficient Fe59 and I125 deoxyuridine uptake by lympho-hemopoietic cell transplants engaged in homograft reactionsThese studies have been supported by funds from the Bureau of Medicine and Surgery, U. S. Navy Department. The opinions and assertions herein are not to be construed as official or as reflecting the views of the Navy Department. (1968)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Cellular Physiology 71 (1968), S. 185-196 
    Details
    ISSN: 0021-9541
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: Erythropoietic activity of spleen cell grafts was measured (Fe59 uptake) in X-irradiated recipient mice under conditions in which these grafts were engaged in homograft reactions against allogeneic target cells or in graft-versus-host reactions. Such Fe59 incorporation was greatly reduced at 7 to 10 days after graft implantation relative to that of control grafts. This reduced erythropoiesis did not occur when the spleen cell graft was immunologically incompetent. Transplantation of bone marrow-lymph node cell mixtures also resulted in a relative decline in Fe59 uptake, but only when minimal numbers (105 to 106) of marrow cells were injected. The incorporation of I125 UdR in the spleen of irradiated recipients was used to assess cellular proliferation. Incorporation of this label was reduced when measured 7-10 days after implantation of the lympho-hemopoietic cell graft, but reached a peak at five days - the latter indicating stimulated lymphopoiesis. These data are consistent with the concept of depletion of a pluripotent stem cell pool (limited in size under these experimental conditions) due to excessive and concurrent functional demands for erythropoiesis and lymphopoiesis. An alternative explanation would involve cytotoxic effects on hemopoietic elements present in the milieu of the immunologic reaction.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jcp.1040710302
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  • 7
    Electronic Resource
    Electronic Resource
    Metabolic control reactions of the intact urinary bladder of the toadPreliminary reports of this work have been published (Davis and Canessa-Fischer, '61a, b; Canessa-Fischer, Edelmann and Davis, '62; Davis, Canessa-Fischer and Edelmann, '62). (1966)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Cellular Physiology 67 (1966), S. 345-354 
    Details
    ISSN: 0021-9541
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: Metabolic control reactions have been studied in the intact toad bladder by means of fluorescence spectrophotometric measurement of reduced pyridine nucleotide and by measurement of respiration with the platinum electrode. substrates such as pyruvate and succinate lead to prompt increases in reduction level of pyridine nucleotide with only slight acceleration of respiration. major metabolic control is exerted by adp, which depletes the intact bladder of reduced pyridine nucleotide and accelerates respiration. respiratory control ratios, as for isolated mitochondria, depend upon the substrate being metabolized. a significant fraction of added adp appears to gain entry into the intact toad bladder and is converted to atp, anaerobiosis and amobarbital lead to increased levels of reduction of pyridine nucleotide. the spectroscopic and metabolic properties of the reduced pyridine nucleotide being studied identify it with that fraction of dpnh which is bound at one of the energy conservation sites linking phosphorylation reactions with electron transfer.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jcp.1040670215
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