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  • Springer  (77)
  • American Association for the Advancement of Science (AAAS)
  • 1990-1994  (77)
  • 1
    Electronic Resource
    Electronic Resource
    Anticalmodulin drugs block the sodium gating current of squid giant axons (1991)
    Springer
    The journal of membrane biology 120 (1991), S. 211-222 
    Details
    ISSN: 1432-1424
    Keywords: anticalmodulin drugs ; trifluoperazine ; W-7 ; W-5 ; sodium currents ; sodium gating currents ; squid giant axons
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Summary The effects of calmodulin (CaM) antagonists (W-7, W-5, trifluoperazine, chlorpromazine, quinacrine, diazepam, propericyazine and carmidazolium) on the sodium and potassium channels were studied on the intracellularly perfused and voltage-clamped giant axon of the squid. It was found that the drugs are more potent blockers of the sodium current than of the potassium current. The drugs also reduce the sodium gating current. The blockage of the sodium and gating current can be explained by assuming that the drugs interact with the sodium gating subunit in one of its closed states. The site of action is probably the intracellular surface of the axolemma where presumably a Ca2+-calmodulin complex can be formed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01868532
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  • 2
    Electronic Resource
    Electronic Resource
    β-hydroxypropionic acid production by Byssochlamys sp. grown on acrylic acid (1993)
    Springer
    Applied microbiology and biotechnology 40 (1993), S. 196-200 
    Details
    ISSN: 1432-0614
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract A strain of Byssochlamys sp. produced β-hydroxypropionic acid when grown on media containing high concentrations of acrylic acid. The maximal production of β-hydroxypropionic acid was 4.8% when the initial culture medium contained 7% acrylic acid and 2% glucose, and the initial culture pH was adjusted to 7.0. β-Hydroxypropionic acid production from acrylic acid depended greatly on the pH of the culture medium. Calcium hydroxide was the best neutralizer.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00170365
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  • 3
    Electronic Resource
    Electronic Resource
    Lack of interaction ofβ-methyldigoxin with ranitidine in patients with chronic congestive heart failure (1992)
    Springer
    European journal of clinical pharmacology 43 (1992), S. 205-206 
    Details
    ISSN: 1432-1041
    Keywords: β-Methyldigoxin ; Ranitidine ; pharmacokinetics ; drug interaction
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01740673
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  • 4
    Electronic Resource
    Electronic Resource
    Cerebral mechanism for reward-mediated learning: A mathematical model of neuropopulational network plasticity (1990)
    Springer
    Biological cybernetics 63 (1990), S. 1-13 
    Details
    ISSN: 1432-0770
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Computer Science , Physics
    Notes: Abstract An interpretation and its mathematical description of neurophysiological and -anatomical data concerning learning mediated by reward are presented. The learning ability requires two basic functions: 1) generating various trials and 2) finding rewarding actions out of the trials according to reward. It is suggested that the first function may be produced by the thalamo-cortical system. The second function requires two types of memory: short-term memory storing generated trials and long term-memory controlled by reward signals which keeps rewarding candidates from the trials. Post-tetanic potentiation and catecholaminedependent plasticity are introduced as neuronal plasticities for the two memories. A hypothetical mechanism of the neural network in the cortex is presented which produces the learning ability from the plasticities. Single neurons' behavior and the synaptic plasticities are formulated according to physiological data. Based on the formulations, a computational model of the cerebral network is constructed to quantitatively describe how the elemental physiological mechanisms of neurons produce the learning ability from the network structure. Analysis of the model shows that stochastic behavior of neuronal populations can regulate the plasticities on the millisecond time scale. Computer simulation is conducted and experimental verification is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00202448
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  • 5
    Electronic Resource
    Electronic Resource
    Analysis of the transcripts of cytochrome P-450IID gene subfamily in bovine adrenal gland (1992)
    Springer
    Histochemistry and cell biology 97 (1992), S. 319-322 
    Details
    ISSN: 1432-119X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary An in situ hybridization experiment showed that the gene transcripts of P-450IID subfamily were uniformly distributed in bovine liver cells and at low levels in bovine adrenal cortex and medulla. There was no clear localization of transcripts of P-450IID genes in three adrenocortical zones, zona glomerulosa, zona fasciculata and zona reticularis. The intensity of signal obtained in the adrenal cortex and medulla showed approximately 2.5:1 ratio. The presence of gene transcripts of P-450IID subfamily in adrenocortex was confirmed by amplifying cDNA using PCR and hybridizing the PCR products with P-450IID cDNA.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00270032
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  • 6
    Electronic Resource
    Electronic Resource
    Air/water two-phase flow test tunnel for airfoil studies (1990)
    Springer
    Experiments in fluids 8 (1990), S. 249-256 
    Details
    ISSN: 1432-1114
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract A test tunnel for the study of airfoil performances under air/water two-phase flow condition has been designed and constructed. This facility will serve for a better understanding of the flow phenomena and characteristics of hydraulic machinery under gas/ liquid two-phase flow operating conditions. At the test section of the tunnel, a two-dimensional isolated airfoil or a cascade of airfoils is installed in a two-phase inlet flow with a uniform velocity (up to 10 m/s) and void fraction (up to 12%) distribution. The details of the tunnel structure and the measuring systems are described and the basic characteristics of the constructed tunnel are also given. As an example of the test results, void fraction distribution around a test airfoil is shown.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00187226
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  • 7
    Electronic Resource
    Electronic Resource
    Agrobacterium-mediated transformation and regeneration of kiwi fruit (1991)
    Springer
    Plant cell reports 10 (1991), S. 286-290 
    Details
    ISSN: 1432-203X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Genetically transformed kiwi fruit (Actinidia deliciosa) plants were obtained from hypocotyl and stem segments co-cultured with Agrobacterium tumefaciens strain EHA101 harboring a binary vector, pLAN411 or pLAN421, which contained the neomycin phosphotransferase II (nptII) gene and the β-glucuronidase (GUS) gene. After co-culturing with the A. tumefaciens, the hypocotyl or stem segments were cultured on a selection medium containing 25μg/ml kanamycin and 500μg/ml Claforan. After one month in culture, shoots had regenerated from the cuttings. Green shoots were analyzed for NPTII activity and GUS activity. Eighty-five percent of the green shoots examined expressed the nptII and GUS genes. GUS histochemical assays revealed strong GUS expression in guard cells, mesophyll cells, and trichomes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00193143
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  • 8
    Electronic Resource
    Electronic Resource
    Egg mass destroying and guarding behaviour of the giant water bug,Lethocerus deyrollei Vuillefroy (Heteroptera: Belostomatidae) (1991)
    Springer
    Journal of ethology 9 (1991), S. 25-29 
    Details
    ISSN: 1439-5444
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Egg mass destroying behaviour of femaleLethocerus deyrollei and male defending behaviour were observed in a densely vegetated concrete pond. In 3 of 9 cases of male-female interactions, the males successfully guarded their egg masses. In 4 of the 6 remaining cases in which the egg masses were destroyed by the female, females successfully took over the mate and laid their own egg masses the same night. These results suggest that male brooding guards the egg mass from females, as well as supplying eggs with water.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02350293
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  • 9
    Electronic Resource
    Electronic Resource
    Additional benefit of egg mass destruction by giant water bugLethocerus deyrollei Vuillefroy (Heteroptera: Belostomatidae) females (1991)
    Springer
    Journal of ethology 9 (1991), S. 34-36 
    Details
    ISSN: 1439-5444
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02350295
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  • 10
    Electronic Resource
    Electronic Resource
    Male counterstrategy against infanticide of the female giant water bugLethocerus deyrollei (Hemiptera: Belostomatidae) (1994)
    Springer
    Journal of insect behavior 8 (1994), S. 181-188 
    Details
    ISSN: 1572-8889
    Keywords: Belostomatidae ; giant water bugs ; paternal care ; infanticide counterstrategy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The male giant water bug'sLethocerus deyrollei counterstrategy against egg mass destruction by the female was investigated in the laboratory. When mature females encounter a brooding male, they destroy his egg mass and thereby take over the mate and gain a nurse for their own egg mass. However, when the male stays on egg masses laid above the water surface, females cannot detect the male nor the egg mass. Eggs of this species fail to hatch without being supplied with water by males. In the observation, brooding males frequently ascend the stick to the egg mass and stay there for long periods, although most of the water attached to their body surface flowed down in 90 s. These long stays on egg masses are regarded as countestrategies against females.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01988903
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