(n.) A microscopic vegetable organism, belonging to the class Algae, usually in the form of a jointed rodlike filament, and found in putrefying organic infusions. Bacteria are destitute of chlorophyll, and are the smallest of microscopic organisms. They are very widely diffused in nature, and multiply with marvelous rapidity, both by fission and by spores. Certain species are active agents in fermentation, while others appear to be the cause of certain infectious diseases. See Bacillus.
Example Sentences:
(1) After Listeria, a bacterium, is phagocytosed by a macrophage, it dissolves the phagosomal membrane and enters the cytoplasm.
(2) These results suggest that the bacterium may not play an important pathogenetic role in ulcer healing and relapse, when patients are managed using an H2-blocker.
(3) Three strains of fluorescent pseudomonads (IS-1, IS-2, and IS-3) isolated from potato underground stems with roots showed in vitro antibiosis against 30 strains of the ring rot bacterium Clavibacter michiganensis subsp.
(4) Microbiological analyses of sediments located near a point source for petrogenic chemicals resulted in the isolation of a pyrene-mineralizing bacterium.
(5) However, the amino acid sequence of the enzyme from the bacterium exhibited low identities (25-30%) with the same enzyme from eukaryotes.
(6) The cytoplasm and the periplasma of the gram-negative facultative photosynthetic bacterium Rhodopseudomonas sphaeroides contain phospholipid transfer proteins; these seem to be involved in the biosynthesis of prokaryotic membranes.
(7) in all of the clinical groups studied suggests that this bacterium is not a good marker of periodontal disease and that it is necessary to define the most characteristic phenotypes and genotypes.
(8) Mössbauer spectroscopy has been used to study the heme iron in various states of cytochrome P450cam from the camphor-hydroxylating system of the bacterium Pseudomonas putida.
(9) We examined the predacious gram-negative bacterium Bdellovibrio bacteriovorous 109J and free-living strains 109J-A1 and 109J-KA1 derived therefrom for penicillin-binding proteins (PBPs).
(10) The enzyme hydrogenase, from the photosynthetic bacterium Chromatium, was purified to homogeneity after solubilization of the particulate enzyme with deoxycholate.
(11) The 3-ketoglycose-synthesizing system in the bacterium does not affect the relative participation of these two pathways.
(12) We have isolated a mutant of the luminous bacterium Beneckea harveyi, which requires exogenous adenosine 3',5'-monophosphate (cyclic AMP) to synthesize luciferase and emit light.
(13) Of the major metabolic processes investigated in this bacterium, only de novo synthesis of the cell envelope was inhibited by lombazole well in advance of an effect on growth.
(14) Allo-deoxycholic acid was formed only in cell extracts prepared from bacteria induced by cholic acid, suggesting that their formation may be a branch of the cholic acid 7 alpha-dehydroxylation pathway in this bacterium.
(15) Crude extracts from aerobically grown bacterium Klebsiella pneumoniae contain three different types of catalases, designated KpT, KpCP, and KpA, whose activities in crude extracts are in the ratio 4.1:1:0.3.
(16) Nitrendipine, verapamil, LaCl3 and omega-conotoxin were tested and these blockers inhibited chemotactic behaviour in the bacterium toward L-alanine.
(17) After several rounds, the scientists had pieced together all 1m letters of the bacterium's genome.
(18) An assay for the determination of NAD(P)+ and NAD(P)H in extracts from the obligate anaerobe bacterium Thermoanaerobacter finnii is developed and the strategy for this development is described.
(19) The bacterium produces unique, branched-chain fatty acids, catalase, oxidase (weakly), and gelatinase and uses starch while ignoring other carbohydrates.
(20) Previous studies have demonstrated that human salivary alpha-amylase specifically binds to the oral bacterium Streptococcus gordonii.
Fission
Definition:
(n.) A cleaving, splitting, or breaking up into parts.
(n.) A method of asexual reproduction among the lowest (unicellular) organisms by means of a process of self-division, consisting of gradual division or cleavage of the into two parts, each of which then becomes a separate and independent organisms; as when a cell in an animal or plant, or its germ, undergoes a spontaneous division, and the parts again subdivide. See Segmentation, and Cell division, under Division.
(n.) A process by which certain coral polyps, echinoderms, annelids, etc., spontaneously subdivide, each individual thus forming two or more new ones. See Strobilation.
Example Sentences:
(1) Primer extension experiments show that in fission yeast transcripts are initiated at the same starting point as in tomato, indicating for the first time that a plant promoter can be correctly recognized in fission yeast.
(2) When the reactor is running, high-speed particles called neutrons strike the uranium atoms and cause them to split in a process known as nuclear fission.
(3) On the basis of hystological studies a description of fission and gastrulation in Microsomacanthus paramicrosoma (gasowska, 1931) is given.
(4) However, in conical cells the new oral apparatus and fission line form well posterior to the cell equator, so the opisthes are invariably smaller than proters.
(5) We have cloned the gene for the resident luminal ER protein BiP from the fission yeast, Schizosaccharomyces pombe.
(6) A strain of fission yeast carrying replicating instability (RI) will segregate mitotically three types of cells: unstable (still RI-carrying) cells, stable identical mutants and stable non-mutants.
(7) The present data demonstrate that whereas most ssb caused by exposure to fission-spectrum neutrons can be rapidly repaired by both cell lines, a small but statistically significant fraction of the ssb induced by exposure to 6 Gy of neutrons is refractory to repair.
(8) 1965.-Thin sections of filterable hemolytic anemia agent of rat, now identified as Haemobartonella muris, revealed (i) that the agent is spherical or ellipsoidal and 350 to 700 mmu in size, (ii) that it has a single limiting membrane enclosing granules and some filaments (neither cell wall nor nucleoid was found), and (iii) that it is found preferentially at the surface and sometimes within the cytoplasmic vacuoles of erythrocytes in the circulating blood and bone marrow, and multiplies there through binary fission.
(9) The cyclin of fission yeast is the product of the cdc13 gene, which is known to interact with cdc2, a gene required for the entry into mitosis.
(10) of fission neutrons for the induction of yellow-green sectors in maize.
(11) Comparison of the identified fission sites of the B. subtilis neutral proteinase with the known substrate-specificity of the enzyme indicated that they were in agreement, showing a preference for the generation of fissions at the N-terminal side of large hydrophobic residues, such as leucine, isoleucine and methionine.
(12) These acrocentrics were also suggested to be originated from Robertsonian fission of the large metacentric M1 chromosome.
(13) In fission yeast the ability to undergo meiosis and sporulation is conferred by the matP+ and matM+ genes of the mating-type locus.
(14) Furthermore, the protein is highly similar to the fission yeast spi1 gene product [Matsumoto and Beach, Cell 66 (1991) 347-360].
(15) However, energy will either be provided from fossil fuels, nuclear fission or renewables.
(16) The ring-fission product of catechol was formed from phenol by a fluorescent Pseudomonas, that of 3-methylcatechol was formed from o-cresol and m-cresol, and the ring-fission product of 4-methylcatechol was given from p-cresol.
(17) The pho4 gene of the fission yeast Schizosaccharomyces pombe is regulated by thiamin.
(18) The author interprets the formation of exposure factors in a nuclear reactor accident, causes of the formation of a separated mixture of nuclear fission fragments and their principal radionuclide composition.
(19) A model of fission into subdivisions is superimposed on the previous branching process, and variation between subdivisions is considered.
(20) As measured by sectors per krad, mutagenic efficiency increased with increased dose of gamma-radiation; the opposite was true for fission neutrons.