| fis | fission |
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| fission fungi | <biology> An order of Schizophyta, including the so-called fission fungi, or bacteria. See Schizophyta, in the Supplement. Origin: NL, fr. Gr. To split +, -, a fungus. Source: Websters Dictionary (01 Mar 1998) |
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| algae and fungi | Algae represent a group of spore-propagating plants, unicellular or undifferentiated into root, stem, and leaf. They include seaweed and many unicellular fresh water plants, most of which contain chlorophyll. They account for about 90% of the earth's photosynthetic activity. Fungi are eukaryotic, heterotrophic organisms that live as saprobes or parasites and include mushrooms, yeasts, smuts, molds, etc. They lack chlorophyll. (12 Dec 1998) |
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| fungi | <microbiology> Kingdom Fungi includes organisms such as slime moulds, mushrooms, smuts, rusts, mildews, moulds, stinkhorns, puffballs, truffles and yeasts. All are classified in this kingdom because they absorb food in solution directly through their cell walls and reproduce through spores. None conduct photosynthesis. (05 Jan 1998) |
| Fungi Imperfecti | A phylum of fungi in which sexual reproduction is not known or in which one of the mating types has not yet been discovered. Formerly, most fungi causing disease in humans were considered asexual and were placed in this class, but studies have revealed that they are not imperfect and that in their sexual forms they can be classified as ascomycetes or basidiomycetes. (05 Mar 2000) |
| binary fission | <cell biology> Division of a cell into two daughter cells after DNA replication and nuclear division (mitosis). A form of asexual reproduction. (09 Oct 1997) |
| bud fission | 1. <biology> The formation of a new individual, either animal or vegetable, by a process of budding; an asexual method of reproduction; gemmulation; gemmiparity. See Budding. 2. <botany> The arrangement of buds on the stalk; also, of leaves in the bud. Origin: Cf. F. Gemmation. Source: Websters Dictionary (01 Mar 1998) |
| multiple fission | Division of the nucleus, simultaneously or successively, into a number of daughter nuclei, followed by division of the cell body into an equal number of parts, each containing a nucleus. (05 Mar 2000) |
| simple fission | Division of the nucleus and then the cell body into two parts. See: binary fission. (05 Mar 2000) |
| nuclear fission | Nuclear reaction in which the nucleus of a heavy atom such as uranium or plutonium is split into two approximately equal parts by a neutron, charged particle, or photon. (12 Dec 1998) |
| fission | A type of cell division in which overall (i.e., not localised) cell growth is followed by septum formation which typically divides the fully grown cell into two similar or identical cells. (09 Oct 1997) |
| fission product | An atomic species produced in the course of the fission of a larger atom such as 235U. (05 Mar 2000) |
| fission reactor | <radiobiology> A device that can initiate and control a self-sustaining series of nuclear fissions, typically used for either research or the production of energy or nuclear weapons materials. (09 Oct 1997) |
| fission yeast | <fungus> Species of fission yeast commonly used for studies on cell cycle control because there is a distinct G2 phase to the cycle. Only distantly related to the budding yeast Saccharomyces cerevisiae Saccharomyces cerevisiae. A further advantage is that some mammalian introns are processed correctly. (18 Nov 1997) |
| fusion-fission hybrid | <radiobiology> Proposed nuclear reactor relying on both fusion and fission reactions. A central fusion chamber would produce neutrons to induce fission in a surrounding blanket of fissionable material. The neutron source could also be used to convert other materials into additional fissile fuels (breeder hybrid). Safer than a plain fission reactor because the fission fuel relies on the fusion neutrons, and therefore cannot achieve criticality. On the other hand, hybrids are more complex because of the fusion power core, and still generate fission's radioactive byproducts. But a fusion-fission hybrid could be more economical and have less stringent technical requirements than a pure fusion reactor. (05 Jan 1998) |
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