Zoology: Metz and B Utterfield Extraction of a Mating React[on Inhibiting Agent from Paramecium Calkinsi*
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Guanine nucleotides modulate calcium currents in a marine Paramecium.
Voltage-dependent calcium channels play a critical role in many cell functions and in many cell types ranging from protozoa to vertebrates. We have shown previously that guanine nucleotides modulate the calcium action potential and the duration of backward swimming in Paramecium, both indirect measurements of calcium channel function. To determine whether guanine nucleotides to indeed alter cal...
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Effects of mating sex ratios on production performance in Indian peafowl were investigated at PunjabWildlife Research Institute, Gatwala Faisalabad. Research was conducted from May through August 2007 toexplore the most productive mating sex ratio. The sex ratios have a significant effect on egg production.Maximum mean eggs (1.63) were produced by the sex ratio 1:2 while maximum egg fertility (...
متن کاملThe nature and origin of mutations which block a temporal sequence for genic expression in paramecium.
HERE is a temporal sequence for the expression of two genetically independTent loci in Paramecium bursaria. This sequence was brought to light by demonstrating differences in the competence for mating among cells derived at successive intervals during the vegetative growth of exconjugant clones ( SIEGEL and COHEN 1963). The junctional linkage of the two genes was suggested by the discovery that...
متن کاملOSMOTIC TOLERANCE OF Ca-DEPENDENT EXCITABILITY IN THE MARINE CILIATE PARAMECIUM CALKINS J
The electrical membrane properties of the marine (brackish-water) ciliate Paramecium calkinsi were investigated under constant-current and voltage-clamp conditions, using two intracellular microelectrodes. The action potential and membrane currents were extremely tolerant to changes in the salinity of the bathing medium. Current-voltage relationships exhibited a moderate inward-going rectificat...
متن کاملMethod for the simultaneous establishment of many axenic cultures of Paramecium.
A method is described for the simultaneous treatment of 42 (or more) stocks of Paramecium, and their adaptation to growth in axenic culture. Samples of dense cultures of these ciliates growing with Enterobacter aerogenes are rendered bacteria-free by migration through 2 sets of tubes containing Adaptation Medium (Peters' salts solution, stigmaterol, vitamins, and autoclaved E. aerogenes). The 2...
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تاریخ انتشار 2005