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  • Light and electron microscopy  (7)
  • Springer  (7)
  • Cambridge University Press
  • 1970-1974  (7)
  • 1945-1949
Collection
Keywords
Publisher
  • Springer  (7)
  • Cambridge University Press
Years
Year
  • 1
    Electronic Resource
    Electronic Resource
    Studies on the acetylcholinesterase (ache)-positive and -negative autonomic axons supplying smooth muscle in the normal and 6-hydroxydopamine (6-OHDA)treated rat iris (1973)
    Springer
    Cell & tissue research 138 (1973), S. 211-222 
    Details
    ISSN: 1432-0878
    Keywords: Iris ; Muscle, Nerves ; Light and electron microscopy ; Acetylcholinesterase ; 6-Hydroxydopamine
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The adrenergic and cholinergic innervation to the rat iris has been studied at a light and electron microscopic level. Catecholamine fluorescence histochemistry showed adrenergic nerves to be present in both the dilatator and the constrictor pupillae regions. At a fine structural level the terminal innervation of the iris was studied and criteria for the differentiation between presumptive adrenergic and presumptive cholinergic axon terminals were examined. To aid this examination presumptive adrenergic axons were either labelled with the “false” adrenergic transmitter, 5-hydroxydopamine, or chemical sympathectomy performed using 6-hydroxydopamine. The value of using acetylcholinesterase staining as a marker for cholinergic nerve terminals was also studied. Results showed a mixed adrenergic/cholinergic innervation to the dilatator pupillae. In the constrictor pupillae an exclusively cholinergic innervation was found although adrenergic and cholinergic nerves were found supplying the blood vessels and at the dilatator-constrictor interface. These findings are discussed with regard to innervation-function relationships in the iris.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00306608
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  • 2
    Electronic Resource
    Electronic Resource
    Comparative ultrastructural study of normal and grafted skin in the frog,Rana pipiens, with special reference to neuroepithelial connections (1973)
    Springer
    Cell & tissue research 139 (1973), S. 451-462 
    Details
    ISSN: 1432-0878
    Keywords: Skin ; Anurans ; Regional differences in grafts ; Neuroepithelial relationships ; Light and electron microscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Recent investigations have suggested specific differences in back and belly skin in anurans which appear to influence the quality of reflex responses obtained from various areas of the animals body. The present investigation represents a comparative morphological study of back and belly skin in control and skin-graftedRana pipiens, with special regard to the neuroepithelial relationships. A distinct difference in pigmentation of back and belly skin was observed. Intra-epithelial Merkel cells were present in all skin samples studied. The origins of the numerous unclassifiable cells in the Merkel cell region are discussed in relation to a presumed coordinating function of the Merkel cell during epithelial differentiation. Epitheliomesenchymal interactions were observed in the richly innvervated dermal regions. Two types of morphologically different intra-epithelial nerve endings were observed. These observations are discussed in relation to earlier observations on vertebrate skin and in relation to misdirected reflex responses obtained in skin-grafted anurans.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02028387
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  • 3
    Electronic Resource
    Electronic Resource
    The aesthetes of chitons (1974)
    Springer
    Cell & tissue research 153 (1974), S. 383-398 
    Details
    ISSN: 1432-0878
    Keywords: Aesthete Organs ; Lepidochitona cinereus ; Cell types ; Secretory cells ; Light and electron microscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The structure of the aesthete organs of the chiton Lepidochitona cinereus (L.) is described by light and electron microscopy. The observations do not discount a sensory function for these organs, but possible sensory structures such as microvilli and cilia are poorly organised. Most of the aesthete is taken up with large cells actively forming secretory products and apparently passing them proximally in the aesthete canal towards the animal. Comparisons are drawn with the brachiopod caecae.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00229166
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  • 4
    Electronic Resource
    Electronic Resource
    Ultrastructure de l'œuf de Triatoma infestans Klug (1973)
    Springer
    Cell & tissue research 138 (1973), S. 113-132 
    Details
    ISSN: 1432-0878
    Keywords: Eggs ; Insects (Triatoma infestans) ; Embryogenesis ; Envelopes, Permeability ; Light and electron microscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The thick rigid chorion of the egg of Triatoma secreted by the follicle cells shows two porous layers: an aerial layer in the exochorion, an alveolar one in the endochorion. The anterior part of the eggshell is closed up by an operculum which is heaved up by the hatching larva. The operculum has no alveolar layer. The air enters through the numerous holes of the shell surface into the aerial layer and through the micropyles into the alveolar layer. The egg has no respiratory plastron. The follicle cells produce also a vitelline envelope whose structure shows a rapid condensation at fertilization time. During its development the embryo secretes two layers: serosal and embryonic cuticle. At high humidities, at low temperatures the egg is able to increase its weight during the early stages of embryogenesis, and this increase stops when the serosal cuticle is secreted. In a dry atmosphere the egg loses water but can develop if the temperature is higher than 20°C. The little permeability of the egg is related to the structure of its envelopes. The chorion and the vitelline envelope prevent the water from getting out of the egg. The serosal cuticle seems to be opposed to the penetration of the water into the egg. The role of the embryonic cuticle is probably limited in the transit of water.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00307082
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  • 5
    Electronic Resource
    Electronic Resource
    Microtubules and movement in the archigregarine, Selenidium fallax (1974)
    Springer
    Cell & tissue research 148 (1974), S. 331-345 
    Details
    ISSN: 1432-0878
    Keywords: Microtubules ; Movement ; Selenidium ; Pellicle ; Light and electron microscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The archigregarine, Selenidium, is parasitic in the digestive tracts of some polychaete worms. The trophozoites of Selenidium are worm-like in appearance, and are attached by one end to the intestinal epithelium of the host, while the remainder of the organism performs rhythmic bending movements, reminiscent of nematode worms. The trophozoites have a multilayered, longitudinally folded pellicle, and beneath this are longitudinally oriented microtubules, arranged in precise fashions. The arrangements of both the pellicle, and the microtubules change during the bending movements. Furthermore, if trophozoites are treated with the drug colchicine, the sub-pellicular microtubules are destroyed, the patterns of pellicular folding are altered, and the trophozoites cease to move. The contribution of the pellicle and the microtubules to the characteristic movements of the trophozoites is evaluated and discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00224261
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  • 6
    Electronic Resource
    Electronic Resource
    The aquatic egg of Nymphula nymphaeata (Lepidoptera: Pyralidae) (1974)
    Springer
    Cell & tissue research 149 (1974), S. 473-479 
    Details
    ISSN: 1432-0878
    Keywords: Aquatic eggs ; Insects ; Envelopes ; Respiration ; Light and electron microscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The aquatic egg of Nymphula has no trabecular layer and no aeropyles. Four tubular micropyles only traverse the anterior part of the chorion. Presumably, the egg contains a sufficient quantity of air to allow the development of the caterpillar when the egg is immersed in paraffin oil. Under the chorion, the vitelline membrane possesses crypts and furrows which seem filled by air. This air can enter through the permeable regions of the vitelline membrane. The mucus, between the chorion and the under surface of the leaf, may constitute an external air reserve dependent on photosynthesis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00223026
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  • 7
    Electronic Resource
    Electronic Resource
    Effects of preganglionic sympathectomy on secretory changes in parotid acinar cells of rats on eating (1974)
    Springer
    Cell & tissue research 154 (1974), S. 135-150 
    Details
    ISSN: 1432-0878
    Keywords: Parotid glands (Rat) ; Secretion ; Sympathetic ; Autonomic innervation ; Cervical sympathectomy ; Light and electron microscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Rats starved for 40 hours showed similar appearances in both parotid glands despite the fact that cervical sympathectomy had been performed on one side 24 hours before the tissues were removed. The acini of both glands of each animal were loaded with secretory granules and amylase estimations on both sides were similar. Rats starved for 40 hours and then fed chow for 1 1/2–2 1/2 hours showed variable depletion of secretory granules from their parotid acinar cells and corresponding alterations of amylase concentration. There was marked asynchrony in both granule depletion and the phase of resynthesis of individual cells. Rats starved during 40 hours and having had unilateral cervical sympathectomy 24 hours prior to a terminal eating phase of 1 1/2–2 1/2 hours showed big differences between the parotid glands on the different sides of each animal. The sympathectomised gland showed little or no depletion of secretory granules whereas the normally innervated gland showed a variable loss of granules, which was always greater than on the denervated side. Amylase estimations were also lower on the normally innervated side. It is concluded that normal reflex secretion of acinar granules in parotid glands of rats on eating requires intact sympathetic nerve pathways.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00223160
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