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  • Calcium
  • Lepidoptera
  • Wiley-Blackwell  (5)
  • 1985-1989  (4)
  • 1980-1984  (1)
  • 1950-1954
  • 1940-1944
  • 1
    Electronic Resource
    Electronic Resource
    Effect of Ca2+-antagonists on virally-induced cell-permeability changes (1984)
    New York, NY [u.a.] : Wiley-Blackwell
    Cell Biochemistry and Function 2 (1984), S. 249-253 
    Details
    ISSN: 0263-6484
    Keywords: Calcium ; Ca2+-antagonists ; calmodulin ; calmodulin inhibitors ; intracellular cation changes ; permeability changes ; virally-induced permeability changes ; Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: Sendai virus-mediated permeability changes in cells are affected by extracellular Ca2+ or Mn2+ as follows: the lag period to onset of permeability changes is lengthened and the subsequent extent of leakage is reduced. Drugs that block Ca2+ action in excitable cells, such as verapamil and prenylamine, and drugs that inhibit the action of calmodulin, such as trifluoperazine and R24571, have an effect opposite to that of Ca2+: lag is shortened and extent of leakage is increased. The concentration at which either type of drug shows 50% of maximal effect is similar to the concentration at which 50% of binding by drug to calmodulin is achieved. It is concluded that calmodulin may be involved in protecting cells against virally-mediated membrane damage; alternatively the action of calmodulin-binding drugs may not be as specific as currently thought.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cbf.290020412
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  • 2
    Electronic Resource
    Electronic Resource
    Calcium transport from blood into the bile in normal and regenerating rat liver (1987)
    New York, NY [u.a.] : Wiley-Blackwell
    Cell Biochemistry and Function 5 (1987), S. 37-46 
    Details
    ISSN: 0263-6484
    Keywords: Calcium ; calcium transport ; bile formation ; liver regeneration ; Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: We have studied calcium movement from blood into the bile by injecting 45Ca2+ intravenously and measuring the radioactivity appearing in the bile. 45Ca2+ started to appear in the bile at 3 min and maximum values were observed at 5 min after its administration. The amount of calcium secreted into the bile was proportional to the blood calcium concentration indicating that the main pathway involved in calcium movement behaved as a non-saturable system.We have also studied the 45Ca2+ circulation from blood into the bile in rats subjected to a partial hepatectomy. Thereafter, the calcium transported into the bile per gram of liver increased by about 50 per cent. Since bile flow behaved in a similar way, the biliar calcium concentration remained unmodified after hepatectomy.Determination of the activities of the Ca2+ transporting systems in isolated plasma membrane fractions from regenerating livers showed no modification in these activities suggesting that the elevation in calcium movement observed after hepatectomy is not due to an increase in the circulation of Ca2+ through the transhepatocyte pathway, an observation compatible with the absence of saturation in the transport.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cbf.290050105
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  • 3
    Electronic Resource
    Electronic Resource
    Stimulation of sex pheromone production by head extract in Spodoptera littoralis at different times of the photoperiod (1988)
    New York, NY [u.a.] : Wiley-Blackwell
    Archives of Insect Biochemistry and Physiology 9 (1988), S. 211-220 
    Details
    ISSN: 0739-4462
    Keywords: pheromone biosynthesis-activating neuropeptide ; calling behavior ; Lepidoptera ; Chemistry ; Food Science, Agricultural, Medicinal and Pharmaceutical Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology
    Notes: Adult females of Spodoptera littoralis (Lepidoptera: Noctuidae) showed a cyclic pattern of sex pheromone production, and high titers of (Z,E)-9,11-tetradecadienyl acetate, the major component of its pheromone blend, were only detected during scotophase. Maximal amounts of pheromone were extracted approximately 2 h into second scotophase. Decapitation before the beginning of darkness inhibited normal production of pheromone, and no calling behavior was observed. Injection of brain-suboesophageal ganglion (Br-SOG) homogenate at the onset of scotophase restored pheromone production in decapitated females to the levels characteristic of second scotophase. Pheromone biosynthesis was also stimulated in decapitated females during photophase. The response to Br-SOG homogenate injection was dose-dependent. The pheromonotropic activity of Br-SOG extract was the same when females were injected during photophase or scotophase.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/arch.940090305
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  • 4
    Electronic Resource
    Electronic Resource
    Juvenile hormone identification, titer, and degradation during the last larval stadium of Spodoptera littoralis (1989)
    New York, NY [u.a.] : Wiley-Blackwell
    Archives of Insect Biochemistry and Physiology 12 (1989), S. 1-14 
    Details
    ISSN: 0739-4462
    Keywords: esterase ; Lepidoptera ; insect development ; α-naphthyl acetate ; Chemistry ; Food Science, Agricultural, Medicinal and Pharmaceutical Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology
    Notes: Juvnile hormone (JH) was identified and titers determined during the last larval stadium of the cotton leafworm Spodoptera littoralis using combined gas chromatography-selected ion monitoring-mass spectrometry. JH was almost exclusively limited to JH II, occurring at two major peaks: the first at the beginning of the stadium and the second at days 4 and 5 just after wandering. Degradation of JH and α-naphthyl acetate (α-NA) in hemolymph and fat body was determined during the same developmental periods. JH degradation in hemolymph occurred initially as a broad bimodal peak during the second half of feeding, with peaks at days 2 and 3. The second peak occurred at the end of the stadium, subsequent to the second JH II titer peak. Three α-NA esterase peaks in hemolymph were detected when JH degradation was at a very low level. Fat body JH degradation was resolved as four activity peaks throughout the stadium, with the first three peaks occurring just previous to the JH degradation peaks in the hemolymph. The highest levels of JH and α-NA degradation activities in fat body were related to the wandering stage.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/arch.940120102
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  • 5
    Electronic Resource
    Electronic Resource
    Use of backscattered electron imaging on developed radioautographic emulsions: Application to viewing rat incisor enamel maturation pattern following 45calcium injection (1987)
    New York, NY : Wiley-Blackwell
    Journal of Electron Microscopy Technique 5 (1987), S. 357-365 
    Details
    ISSN: 0741-0581
    Keywords: BEI ; Calcium ; Enamel ; Radioautography ; Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Natural Sciences in General
    Notes: Backscattered electron imaging (BEI) can be used to obtain compositional contrast in biological structures because it detects differences in concentration of elements with different atomic number. Rat incisor enamel shows a banded pattern in the maturation zone when radioautography is used to reveal the location of injected 45Ca at the enamel surface. The bands of developed silver grains in the photographic emulsion that coats the enamel surface are ideal for atomic number contrast. The purpose of this study was to use BEI to analyze the radioautographic pattern with SEM resolution. One-month-old rats were injected with 45Ca and sacrificed at early (1 min, 5 min, 30 min), intermediate (4 h, 8 h), and late (1 day, 4 days) time intervals after injection. Whole incisors were dissected, the enamel organs were removed, and the enamel surface was coated with photographic emulsion and processed for radioautography. These radioautographed teeth were examined with a JEOL JSM-840 SEM equipped with a JEOL backscatter annular-type detector. At the early time intervals, light microscopic examination showed five or six broad black bands running obliquely across the teeth. These were separated by narrow white bands of unlabeled enamel. BEI resolved the presence of a delicate subbanding pattern within each dark band. At the intermediate time intervals, although the incisal bands persisted, only a diffusely blackened apical area was seen by light microscopy. BEI resolved bands in this apical region, but these showed no subbanding pattern. At the late time intervals, both light microscopy and BEI showed no banding, and the enamel was uniformly labeled. The significantly improved resolution obtained with BEI on surface radioautographs has revealed a previously undetected substructure in the 45Ca-labeled banding pattern seen in enamel maturation.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jemt.1060050406
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