| 单词 | zoospore |
| 例句 | They produce gametes and diploid zoospores that swim with the help of a single flagellum. Fundamentals of Biology 2015-01-01T00:00:00Z Phytophthora is a zoospore, which means it goes through a swimming phase during its life cycle. Invasive Fungi Wreak Havoc on Species World-Wide [Slide Show] 2012-08-13T09:45:05.167Z After four days, the fungus developed discharge tubes and released new zoospores, showing that the geese’s toe scales provided not just a site for the fungus to reside but also to reproduce. Geese May Be Helping to Spread Frog-Killing Fungus 2012-04-19T21:45:03Z Reproduction in the olive sea-weeds is also double, by zoospores, generally considered gemmæ, and by spores and antherozoids, which is a sexual process. Sea-Weeds, Shells and Fossils 2011-08-20T02:00:11.557Z A. a, Conidia. b, Conidiophores. c, Conidium emitting zoospores. d, Free zoospore. Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 3 "Frost" to "Fyzabad" 2011-08-15T02:00:28.473Z The life cycle of the brown algae, Laminaria, begins when sporangia undergo meiosis, producing 1n zoospores. Fundamentals of Biology 2015-01-01T00:00:00Z These zoospores are amoeboid; they soon secrete a shell and reveal themselves as megalospheres, the original state of the megalospheric forms. Encyclopaedia Britannica, 11th Edition, Volume 10, Slice 6 "Foraminifera" to "Fox, Edward" 2011-04-22T02:00:08.637Z The affinities of the Dinoflagellata are certainly with those Cryptomonadine Flagellates which possess two unequal flagella; the zoospores or young of the Cystoflagellates are practically colourless Dinoflagellates. Encyclopaedia Britannica, 11th Edition, Volume 8, Slice 5 "Dinard" to "Dodsworth" The individuals of which it consists are composed of threads, jointed, either simple or branched, mostly of a grass-green colour, and propagating either by minute zoospores or by metamorphosed joints. Sea-Weeds, Shells and Fossils 2011-08-20T02:00:11.557Z K, Germination of the zoospores formed in the sporangia. Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 3 "Frost" to "Fyzabad" 2011-08-15T02:00:28.473Z The zoospores being furnished with vibratile cilia, are for some time active, and need only water in which to disseminate themselves, and this is furnished by rain. Fungi: Their Nature and Uses Each nucleus aggregates around it a proper zone of dense protoplasm; by two successive mitotic divisions each mass becomes quadri-nucleate, and splits up into four biflagellate, uninucleate zoospores. Encyclopaedia Britannica, 11th Edition, Volume 10, Slice 6 "Foraminifera" to "Fox, Edward" 2011-04-22T02:00:08.637Z Thuret, on the division of the zoospores of an alga, ii. The Variation of Animals and Plants Under Domestication, Volume II (of 2) The endochrome is believed to be fertilized by bodies developed in antheridia, the contents of each fertilized cell dividing into four ovate zoospores. Sea-Weeds, Shells and Fossils 2011-08-20T02:00:11.557Z They are usually included in Oomycetes, but their simple structure, minute size, usually uniciliate zoospores, and their negative characters would justify their retention as a separate group. Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 3 "Frost" to "Fyzabad" 2011-08-15T02:00:28.473Z The movement is precisely that of the zoospores of Algæ. Fungi: Their Nature and Uses Such a behaviour is very similar to the production of zoospores which is so common in many filamentous algae. Encyclopaedia Britannica, 11th Edition, Volume 3, Part 1, Slice 2 "Baconthorpe" to "Bankruptcy" It is remarkable that Mr. Darwin brings forward in support of gemmule fission, the observation that "Thuret has seen the zoospore of an alga divide itself, and both halves germinate." On the Genesis of Species It propagates by minute zoospores, by large quiescent spores, or by large active spores clothed with cilia. Sea-Weeds, Shells and Fossils 2011-08-20T02:00:11.557Z C. Formation of zoospores by oospores. z, Free zoospores. Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 3 "Frost" to "Fyzabad" 2011-08-15T02:00:28.473Z The generation of the zoospores commences within from an hour and a half to three hours after the sowing of the conidia on water. Fungi: Their Nature and Uses But, instead of the terminal cell being filled with the usual densely crowded cluster of dark green granules constituting the rapidly forming spore, it contained hundreds of actively moving, nearly transparent zoospores, and nothing else. Scientific American Supplement, No. 460, October 25, 1884 The zoospores or mobile spores of many algæ and fungi. Scientific American Supplement, No. 531, March 6, 1886 The propagation in all of them is by zoospores. Sea-Weeds, Shells and Fossils 2011-08-20T02:00:11.557Z Each “conidium” contains numerous nuclei and is really a zoosporangium, as after dispersal it breaks up into a number of zoospores. Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 3 "Frost" to "Fyzabad" 2011-08-15T02:00:28.473Z From the oogonia, or resting spores, similar zoospores, but in greater number, are generated in the same manner, and their conduct after becoming free is identical. Fungi: Their Nature and Uses Sometimes biciliated minute cells are found; without any doubt they are zoospores derived from any algoid or fungoid species. Scientific American Supplement, No. 385, May 19, 1883 Multiplied by division and by the formation of new larger individuals out of the contents of individual conjugated cells; perhaps also by spores and zoospores. Scientific American Supplement, No. 384, May 12, 1883 These "zoospores" conjugate in pairs, and give rise to quiescent bodies, which multiply by division, find eventually pass into the active state. Discourses Biological and Geological Essays It is true one may argue that the zoospores of certain cryptogamia exhibit similar movements; but do not these zoospores possess as much of an animal nature as do the spermatozoa? The Harvard Classics Volume 38 Scientific Papers (Physiology, Medicine, Surgery, Geology) Each of these, when free, immediately takes the form of a perfect zoospore, and commences to agitate itself. Fungi: Their Nature and Uses Each cell of all the plants of this genus produces a large number of mobile cells—zoospores. Scientific American Supplement, No. 385, May 19, 1883 Volvocineæ.—Microscopic cellular fresh water plants, composed of groups of bodies resembling zoospores connected into a definite form by their enveloping membranes. Scientific American Supplement, No. 384, May 12, 1883 After a period of rest, the contents of the oospore break up into a number of zoospores like those already described, each of which, after a period of activity, germinates in the ordinary way. Discourses Biological and Geological Essays ALGAE, retrogressive metamorphosis in. -division of zoospores of, ALLEN, J., birds in United States. The Variation of Animals and Plants under Domestication — Volume 2 The zoospores are oval or semi-oval, and in P. infestans the two cilia spring from the same point on the inferior border of the vacuole. Fungi: Their Nature and Uses When they are plunged into water, the ordinary production of zoospores takes place. Fungi: Their Nature and Uses The families are formed either of assemblages of coated zoospores united in a definite form by the cohesion of their membranes, or assemblages of naked zoospores inclosed in a common investing membrane. Scientific American Supplement, No. 384, May 12, 1883 The conditions which control this form of germination cannot be indicated, since some conidia which germinate after this manner will sometimes be found mixed with others, the majority of which furnish zoospores. Fungi: Their Nature and Uses Its ultimate development by production of zoospores is similar to the production of zoospores from conidia, which it is unnecessary to repeat here. Fungi: Their Nature and Uses The movement of the zoospores ceases at the end of from fifteen to thirty minutes. Fungi: Their Nature and Uses Besides these, other reproductive bodies are generated upon the mycelium, within the tissues of the plant, in the form of globose oogonia, or resting spores, which, when mature, also enclose great numbers of zoospores. Fungi: Their Nature and Uses Fructification: by zoospores, either single or very numerous, and by resting spores formed in sporangial cells after the contents have been impregnated by the contents of autheridial cells of different forms. Scientific American Supplement, No. 384, May 12, 1883 In Peronospora, it has been demonstrated that certain species produce minute zoospores from the so-called spores. Fungi: Their Nature and Uses On the other hand, the pseudospores of Cystopus, when sown in water on a slip of glass, will soon produce the curious little zoospores in the manner already described. Fungi: Their Nature and Uses The same development of the zoospores in P. infestans is favoured by the exclusion of the light. Fungi: Their Nature and Uses Reproduction: by cell division, by the conversion of the cell contents into zoospores, and by resting spores, formed sometimes after conjugation; in other cases, probably, by fecundation by spermatozoids. Scientific American Supplement, No. 384, May 12, 1883 Reproduced by zoospores formed from the cell contents and breaking out from the surface, or by motionless spores formed from the whole contents. Scientific American Supplement, No. 384, May 12, 1883 There were also spores and mycelial filaments of fungi, dirt, and zoospores. Scientific American Supplement, No. 384, May 12, 1883 Fructification: zoospores produced from the cell contents of the filaments; resting spores formed from the contents of particular cells after impregnation by ciliated spermatozoids produced in distinct antheridial cells. Scientific American Supplement, No. 384, May 12, 1883 Placed in a position moderately lighted or protected by a blackened bell, the conidia very readily produced zoospores. Fungi: Their Nature and Uses Reproduction by zoospores formed of the whole contents of a cell, with a crown of numerous cilia; resting spores formed in sporangial cells after fecundation by ciliated spermatozoids formed in antheridial cells. Scientific American Supplement, No. 384, May 12, 1883 |
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