منابع مشابه
Phototaxis in Chlamydomonas Reinhardtii
Parameters which distinguish phototaxis from random motility in Chlamydomonas reinhardtii have been defined with quantitative assays. The phototactic responses in photosynthetic, mixotrophic, and heterotrophic cultures were highest during exponential growth and declined rapidly as the cultures entered stationary phase. In contrast, random motility was relatively constant throughout growth. Phot...
متن کاملPhototaxis mutants of Chlamydomonas reinhardtii.
A group of 31 mutants of Chlamydomonas reinhardtii with altered phototactic responses was isolated. Growth of all the mutants was normal and, with one exception, they had no gross morphological aberrations. One mutant produced supernumerary flagella. The mutants can be subdivided into five phenotypic classes on the basis of their abnormal responses: slow positive, no reponse, slow negative, fas...
متن کاملLinear systems analysis of the ciliary steering behavior associated with negative-phototaxis in Chlamydomonas reinhardtii.
In response to light stimulation Chlamydomonas reinhardtii changes the beating frequency, beating pattern, and beating synchrony of the trans and cis cilia to steer the freely-swimming cell relative to light sources. To understand the cell steering behavior the impulse responses of the beating frequency and stroke velocity of each cilium have been obtained with high temporal resolution on cells...
متن کاملTwo rhodopsins mediate phototaxis to low- and high-intensity light in Chlamydomonas reinhardtii.
We demonstrate that two rhodopsins, identified from cDNA sequences, function as low- and high-light-intensity phototaxis receptors in the eukaryotic alga Chlamydomonas reinhardtii. Each of the receptors consists of an approximately 300-residue seven-transmembrane helix domain with a retinal-binding pocket homologous to that of archaeal rhodopsins, followed by approximately 400 residues of addit...
متن کاملChlamydomonas reinhardtii
A mutation at the PFlO locus of the unicellular green alga Chlamydomonas reinhardtii leads to abnormal cell motility. The asymmetric form of the ciliary beat stroke characteristic of wild-type flagella is modified by this mutation to a nearly symmetric beat. We report here that this abnormal motility is a conditional phenotype that depends on light intensity. In the absence of light or under lo...
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ژورنال
عنوان ژورنال: Journal of Cell Biology
سال: 1973
ISSN: 1540-8140,0021-9525
DOI: 10.1083/jcb.59.2.367