单词 | Chlamydomonas |
例句 | Chlamydomonas cells, like those of many other algae and single-celled protists, can grow very large before they divide. New discovery on how green algae count cell divisions illuminates key step needed for the evolution of multicellular life 2023-11-13T05:00:00Z Chlamydomonas is a simple, unicellular chlorophyte with a pear-shaped morphology and two opposing, anterior flagella that guide this protist toward light sensed by its eyespot. Fundamentals of Biology 2015-01-01T00:00:00Z For example, in a unicellular relative of Volvox, Chlamydomonas, organelles called centrioles do double duty. The momentous transition to multicellular life may not have been so hard after all 2018-06-28T04:00:00Z Some, such as Chlamydomonas nivalis, spread first as greenish blooms as they begin to photosynthesize, and then turn a reddish colour as they produce carotenoid pigments to protect themselves from the sun’s ultraviolet rays. Algae melting away Greenland ice sheet 2016-07-14T04:00:00Z When Olson, who teaches evolutionary genomics at Kansas State University, removed the gene from a Gonium and put it in its unicellular relative, Chlamydomonas, the formerly single-celled organisms started clumping together to form colonies. This gene helps prevent cancer. Did it also give rise to all complex life? 2016-04-26T04:00:00Z Multicellular relatives of Chlamydomonas not only skip the option to undergo one division but can prevent division until they have grown many times in size. New discovery on how green algae count cell divisions illuminates key step needed for the evolution of multicellular life 2023-11-13T05:00:00Z Some green algae are single cells, such as Chlorella and Chlamydomonas, which adds to the ambiguity of green algae classification, because plants are multicellular. Fundamentals of Biology 2015-01-01T00:00:00Z Chlamydomonas can both swim and reproduce, but not at the same time. The momentous transition to multicellular life may not have been so hard after all 2018-06-28T04:00:00Z Most species of Chlamydomonas — and I assume C. nivalis is no exception — possess a light-sensitive eyespot containing rhodopsin. Wonderful Things: Don't Eat the Pink Snow 2013-07-09T16:45:00.647Z In the early years, a few protists were also used - Paramecium, Euglena, Gonyalax, Acetabularia and Chlamydomonas, but they were later largely abandoned, while new models, like Xenopus and zebrafish entered the arena. Circadian clock without DNA--History and the power of metaphor 2011-02-11T16:15:02.303Z "The bias against one division we observed in Chlamydomonas was very likely present in direct ancestors of its multicellular relatives and was further amplified as they evolved greater size and complexity," speculates Umen. New discovery on how green algae count cell divisions illuminates key step needed for the evolution of multicellular life 2023-11-13T05:00:00Z Electron micrograph C shows egg-shaped Chlamydomonas cells attached to thin stalks. Fundamentals of Biology 2015-01-01T00:00:00Z In 2014, Ratcliff and his colleagues applied the same kind of selection for larger cells to Chlamydomonas, the single-celled alga, and again saw colonies quickly emerge. The momentous transition to multicellular life may not have been so hard after all 2018-06-28T04:00:00Z And as you saw, the vegetative cells of Chlamydomonas nivalis are green while growing. Wonderful Things: Don't Eat the Pink Snow 2013-07-09T16:45:00.647Z Of such, one form, Chlamydomonas, is bright grass green in appearance. The Home Medical Library, Volume V (of VI) Chlamydomonas cells can grow very large and then divide multiple times in succession. New discovery on how green algae count cell divisions illuminates key step needed for the evolution of multicellular life 2023-11-13T05:00:00Z More complex chlorophyte species exhibit haploid gametes and spores that resemble Chlamydomonas. Fundamentals of Biology 2015-01-01T00:00:00Z In Chlamydomonas, an ancient stress response pathway blocks reproduction at night, when photosynthesis shuts down and resources are scarcer. The momentous transition to multicellular life may not have been so hard after all 2018-06-28T04:00:00Z By far, the most common species of snow alga is Chlamydomonas nivalis, which colors snow red or pink. Wonderful Things: Don't Eat the Pink Snow 2013-07-09T16:45:00.647Z The name of Chlamydomonas is applied to certain microscopic green bodies, each of which consists of a protoplasmic central substance invested by a structureless sac. Discourses Biological and Geological Essays This size variability presents a conundrum which was solved by the evolution of a mechanism in Chlamydomonas that enables cells to assess their size and count out the correct number of cell divisions. New discovery on how green algae count cell divisions illuminates key step needed for the evolution of multicellular life 2023-11-13T05:00:00Z In a single-celled organism such as Chlamydomonas, there is no mitosis after fertilization. Fundamentals of Biology 2015-01-01T00:00:00Z Sometimes, however, the Chlamydomonas divides into eight parts, each of which is provided with four instead of two cilia. Discourses Biological and Geological Essays Here’s what a different species of Chlamydomonas looks like swarming in water to give you the idea. Wonderful Things: Don't Eat the Pink Snow 2013-07-09T16:45:00.647Z Under ordinary circumstances, the Chlamydomonas multiplies by simple fission, each splitting into two or into four parts, which separate and become independent organisms. Discourses Biological and Geological Essays And on the face of the matter there is no ground for refusing to admit that Heteromita may be related to Chlamydomonas, as the colourless fungus is to the green alga. Discourses Biological and Geological Essays The latter contains cellulose, as in ordinary plants; and the chlorophyll which gives the green colour enables the Chlamydomonas to decompose carbonic acid and fix carbon as they do. Discourses Biological and Geological Essays |
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