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  • Lymnaea acuminata  (2)
  • Ammonia  (1)
  • Marine pulmonate  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Susceptibility of urea and uric acid levels to neurohormone influence in the freshwater pulmonate, lymnaea acuminata (1978)
    Springer
    Hydrobiologia 60 (1978), S. 125-128 
    Details
    ISSN: 1573-5117
    Keywords: Urea ; Uric acid ; neurohormone ; Lymnaea acuminata
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Effects of pooled ganglionic extract on the urea and uric acid levels from blood, hepatopancreas, mantle and kidney of the pulmonate L. acuminata have been analysed. Blood urea and mantle uric acid were significantly (P〈0.005 and P〈0.05 respectively) increased following injection with pleuroparietalpedal-visceral (PPPV Complex) ganglia homogenate within 2 hrs. On the contrary hepatopancreas urea and kidney uric acid levels were significantly (P〈0.00) lowered. Cerebral ganglia homogenate and boiled extract of PPPV complex did not provoke any significant change in urea and uric acid levels. It is advocated that (a) neurohormone(s) which is (are) heat-labile and originate from the PPPV complex, influence(s) the nitrogen end-products in these snails.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00163177
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Regulation of ammonia (NH3-N) metabolism in the marine pulmonate, onchidium verruculatum. I. effects of a neuroendocrine centre on tissue ammonia levels (1980)
    Springer
    Hydrobiologia 68 (1980), S. 265-268 
    Details
    ISSN: 1573-5117
    Keywords: Ammonia ; nitrogen metabolism ; hormonal regulation ; Onchidium verruculatum
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Effect of ganglionic extirpations and replacement on the ammonia levels in the blood and various tissues of the marine pulmonate, O. verruculatum was studied. Three hrs after extirpation of the pleurovisceral (PV) complex only and not any other ganglia, revealed a significant (P 〈 0.001) decline in the blood and foot ammonia levels and significant (P 〈 0.001) increment in the hepatopancreatic ammonia level. However, no change was observed in the mantle and nephridial ammonia levels. Replacement of the PV complex, either via implantation of intact ganglia or boiled and unboiled homogenate administration (1 gn/animal) into the ganglionectomised group, restored ammonia levels in the blood and foot and showed significant (P 〈 0.005) decrease in hepatopancreatic ammonia levels. The results are discussed in the light of hormonal regulation of the nitrogen metabolism.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00018836
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Changes in the neurosecretory cells of the freshwater snail, lymnaea acuminata induced by urea administration (1980)
    Springer
    Hydrobiologia 69 (1980), S. 7-10 
    Details
    ISSN: 1573-5117
    Keywords: Neurosecretory changes ; urea ; Lymnaea acuminata
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The effect of urea injections on the cytomorphology of neurosecretory cells of the snail L. acuminata has been examined. Of the three types of neurosecretory cells (A, B and C) the changes were evident only in C cells from the parietal ganglia. 3 hr after 0.1 ml of 1 M urea plus 0.1 ml of I M glucose injection, the appearance of neurosecretory material (NSM) in the neurohaemal area without any change in C cell C : N (Cytoplasm: nuclear) ratio, was evident, whereas daily injection of urea plus glucose for three consecutive days induced a significant (P = 0.005) increment in C cell nuclear diameter and C : N value over equiosmole control (glucose) injections. This was accompanied by about 50% depletion of perikarya NSM intensity and the neurohaemal area was completely destitute of the NSM. The significance of the data is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00016528
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Reproductive ecology of the marine pulmonate, onchidium verruculatum (1980)
    Springer
    Hydrobiologia 71 (1980), S. 83-85 
    Details
    ISSN: 1573-5117
    Keywords: Marine pulmonate ; reproductive ecology ; aggregated spatial distribution ; food preference
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract O. verruculatum shows aggregated spatial dispersion during the pre-reproductive and reproductive period, which appears to be closely related with propagative requirements. Analysis of the stomach contents and laboratory observations indicate that O. verruculatum feeds on marine sea weeds (Padina and Ulva).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00005830
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    Paper (German National Licenses)
    Fulltext
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