| 单词 | Volvox |
| 例句 | “Volvox,” I read, “it’s Volvox. Is that how you say it?” The Evolution of Calpurnia Tate 2009-05-12T00:00:00Z Volvox colonies contain 500 to 60,000 cells, each with two flagella, contained within a hollow, spherical matrix composed of a gelatinous glycoprotein secretion. Fundamentals of Biology 2015-01-01T00:00:00Z The smaller cells always have flagella, which sweep nutrients over the Volvox's surface and help it swim. The momentous transition to multicellular life may not have been so hard after all 2018-06-28T04:00:00Z Regarding unicellular organisms: single cells and even colonial organisms such as Volvox primarily communicate by releasing chemical signals. Readers Respond to Rise of the Tyrannosaurs 2015-08-28T04:00:00Z The spherical skin of a Volvox embryo is one cell deep. Birth? Trivial Next to Cellular Doughnut-Making Process 2015-05-04T04:00:00Z After a period of rest each zygote, through a series of cell-divisions, develops into an adult Volvox. Being Well-Born An Introduction to Eugenics 2012-05-22T15:16:53.140Z Individual Volvox cells move in a coordinated fashion and are interconnected by cytoplasmic bridges. Fundamentals of Biology 2015-01-01T00:00:00Z Studies of Volvox, an alga that forms beautiful, flagellated green balls, shows that multicellular organisms also found new ways to use existing functions. The momentous transition to multicellular life may not have been so hard after all 2018-06-28T04:00:00Z We have seen that unicellular organisms may unite into a cylindrical or spheroidal colony, as in some Radiolaria, or into a spheroid of closely-adjusted cells, forming one layer, as in Volvox. The Contemporary Review, Volume 36, October 1879 2012-04-18T02:00:17.060Z One of the most striking examples is a moment in the development of Volvox, a kind of algae that forms one of the simplest multicellular organisms. Birth? Trivial Next to Cellular Doughnut-Making Process 2015-05-04T04:00:00Z Natural Death Appears With the Establishment of a Body Distinct from the Germ.—Volvox is an organism of unusual interest because in it we see a prophecy of what is to come. Being Well-Born An Introduction to Eugenics 2012-05-22T15:16:53.140Z They present a wide range of structure, from the simple amoeboid genera to the highly differentiated cells of Euglenaceae, and the complex colonies of Proterospongia and Volvox. Encyclopaedia Britannica, 11th Edition, Volume 10, Slice 4 "Finland" to "Fleury, Andre" 2011-03-20T02:00:30.697Z Whereas Volvox individuals have 500 to 60,000 cells arranged in a hollow sphere, some relatives, such as the Gonium species, have as few as four to 16 cells; others are completely unicellular. The momentous transition to multicellular life may not have been so hard after all 2018-06-28T04:00:00Z Among plants, those of the Volvox type show us the component protophytes so feebly combined that they severally carry on their lives with no appreciable subordination to the life of the group. Essays: Scientific, Political, & Speculative, Vol. I The corresponding early ancestor I name the Blastæa, and again we find examples of it, like the Volvox of the ponds, in Nature to-day. The World's Greatest Books — Volume 15 — Science Sexual Phenomena in Higher Forms.—In the reproduction of multicellular organisms, one sees likewise but a continuation of the phenomena exhibited in Volvox. Being Well-Born An Introduction to Eugenics 2012-05-22T15:16:53.140Z Thus Volvox, a beautiful green ball, found in some canals and the like, is a colony of a thousand or even ten thousand cells. The Outline of Science, Vol. 1 (of 4) A Plain Story Simply Told 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 In this stage they closely resemble the individuals of a Volvox colony, or other green Flagellata, to which there is little doubt that they are related. Elements of Structural and Systematic Botany For High Schools and Elementary College Courses One of the most interesting and significant aspects of the life-history of Volvox is the appearance for the first time of biological death. The Doctrine of Evolution Its Basis and Its Scope Volvox is also a spheroidal organism, composed often of a very large number of flagellated cells. The Whence and the Whither of Man A Brief History of His Origin and Development through Conformity to Environment; Being the Morse Lectures of 1895 Yet the Rotifer—we are thinking of Hydatina—has nine hundred odd cells, whereas the Protozoon has only one, except in forms like Volvox. The Outline of Science, Vol. 1 (of 4) A Plain Story Simply Told Multicellular Volvox can do both at once, because its cells have specialized. The momentous transition to multicellular life may not have been so hard after all 2018-06-28T04:00:00Z In all of these the structure of the cells is essentially as in Volvox. Elements of Structural and Systematic Botany For High Schools and Elementary College Courses But in Volvox a division of labor has been effected of such a nature that most of the components discharge the tasks of individual value, and with the performance of these they die. The Doctrine of Evolution Its Basis and Its Scope The fact is that no critic in this town is fit to meddle with such subjects, unless it be Volvox, and he, with all his command of language, is very superficial. Impressions of Theophrastus Such The white corpuscles of the blood of a frog, and the cilia on two infusorial animals, a Paramaecium and Volvox, were similarly affected by the poison. Insectivorous Plants But in Volvox, the same pathway is active all the time in its swimming cells, to keep their reproduction permanently at bay. The momentous transition to multicellular life may not have been so hard after all 2018-06-28T04:00:00Z The writer has shown that the experiments on the effect of acids on the heliotropism of copepods can be repeated with the same result in Volvox. Darwin and Modern Science Only the reproductive members are immortal in the sense that Amoeba is, for they only have a place in the chain of consecutive generations of Volvox colonies. The Doctrine of Evolution Its Basis and Its Scope Thus a hollow, or fluid-filled, little sphere, like the Volvox, is the natural connecting-link between the microbe and the many-celled body, and may be taken to represent the first important stage in its development. The Story of Evolution Volvox has repurposed other features of the single cell ancestor as well. The momentous transition to multicellular life may not have been so hard after all 2018-06-28T04:00:00Z |
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