(n.) The axis or receptacle in certain ferns (as Trichomanes), which bears the sporangia.
Example Sentences:
(1) Phycomyces sporangiophores respond to four distinct physical stimuli: gravity, light, stretch, and an avoidance stimulus.
(2) The greater sensitivity of a cylindrical Phycomyces sporangiophore to blue light polarized transversely rather than longitudinally is a consequence of the dichroism and orientation of the receptor pigment.
(3) The ATP concentration is constant for any level of light adaptation and is uniform along the length of sporangiophores even though the light sensitivity is confined to a growing zone less than 5 mm long.
(4) After sporangiophores were initially adapted symmetrically to a fluence rate of 1 W m-2 (447 nm), they were exposed to unilateral subliminal light (subthreshold for phototropism) of variable wavelength and fluence rate, and then to unilateral test light (447 nm) of fluence rate either 10(-3) or 10(-5) W m-2.
(5) Phototropic and light growth responses of the sporangiophore of Phycomyces have been elicited using tunable laser stimulation from 575 to 630 nm.
(6) The existence of two photosystems clarifies several behavioral features of Phycomyces and helps explain how the sporangiophore can manage the full range of 10 decades.
(7) To investigate the influence of calcium on dark adaptation, the phototropic latency method was employed with the modification that sporangiophores were temporarily immersed in solutions containing CaCl2 or LaCl3.
(8) The major phosphoglycerides of P. blakesleeanus mycelium and sporangiophores are phosphatidylcholine and phosphatidylethanolamine, and more than 85% of the fatty acids at the sn-1 positions of these phosphatides consisted of 16:0, 18:2, and 18:3.
(9) In the wild type, the number of crystals per sporangiophore increased until the sporangiophore reached stage IV, and then decreased.
(10) Using two-dimensional gel electrophoresis, we have analyzed proteins from a plasma membrane-enriched fraction from Phycomyces sporangiophores.
(11) In the cytoplasm of Phycomyces, ferritin is located on the surface of lipid droplets (0.5-2.0 micro in diameter) where it forms crystalline monolayers which are conspicuous in electron micrographs of sporangiophore thin-sections.
(12) Sporangiophore development is exquisitely sensitive to blue light, easy to describe quantitatively, pliable to genetic and biochemical research, and reminiscent in many details of other photoresponses in the same and in other organisms.
(13) The iron-protein ferritin has been purified from mycelium, sporangiophores, and spores of the fungus Phycomyces blakesleeanus.
(14) Thus, the dim subliminal light given after the sporangiophores had been adapted to 1 W m-2, was actually perceived, and exerted control over the dark-adaptation process.
(15) Cultures revealed rapidly growing yellow colonies on Sabouraud dextrose agar medium at 25 degrees C. Sporangiophores branched in sympodia and the sporangia were globose, 35-60 microns in diameter.
(16) Experimental evidence indicates that during phototropism, Phycomyces sporangiophores use their own net rotation to convert an apparently spatial stimulus to a temporal one.
(17) Centrifuged nuclei of a lycopene-producing mutant were injected into the intact sporangiophore of an albino host where they induced color formation.
(18) The crystals were isolated from the sporangiophores by a method of sucrose density-gradient centrifugation.
(19) This allele is not essential for the photoreactions of the mycelium or the sporangiophore, and the bulk activity of the phosphodiesterase appears to play no role in the phototransduction pathway of Phycomyces.
(20) After immersion in darkness for 30 min in LaCl3 solution or 1 h in a solution of CaCl2, MgCl2, or the calcium chelator EGTA, each sporangiophore was adapted to a blue light beam (1 W m-2) for 45 min by rotation around its vertical axis.
Spore
Definition:
(n.) One of the minute grains in flowerless plants, which are analogous to seeds, as serving to reproduce the species.
(n.) An embryo sac or embryonal vesicle in the ovules of flowering plants.
(n.) A minute grain or germ; a small, round or ovoid body, formed in certain organisms, and by germination giving rise to a new organism; as, the reproductive spores of bacteria, etc.
(n.) One of the parts formed by fission in certain Protozoa. See Spore formation, belw.
Example Sentences:
(1) After absorption of labeled glucose, two pools of trehalose are found in dormant spores, one of which is extractable without breaking the spores, and the other, only after the spores are disintegrated.
(2) The dose response initially resembled that described by Scholer (1959) in which one million spores killed the majority of mice.
(3) Abnormal synaptonemal complexes were seen in all 19 crosses of N. crassa and N. intermedia that were examined, including matings between standard laboratory strains, inversions, Spore killers, and strains collected from nature.
(4) The mutant spores are pleomorphic and differ both in shape and size from the wild-type spores.
(5) The results presented here substantiate the hypothesis that in S. cerevisiae trehalose supplies energy during dormancy of the spores and not during the germination process.
(6) The fungicidal activity of six rabbit neutrophil cationic peptides (NP) against resting (dormant) spores, preincubated (swollen) spores, and hyphae of Aspergillus fumigatus and Rhizopus oryzae was examined.
(7) In the electron microscope large aggregates of beta glycogen particles were seen in the cytoplasm of sporoplasm cells in mature spores.
(8) The spore germination was synchronized by selection of the spores of the definite size and maintenance at a temperature of 0 degrees.
(9) GAD activity appeared in mutant spores after germination and increased to levels comparable to parent spores after 9 min of germination.
(10) The Ca++-form and H+-form spores of Clostridium botulinum 33A were investigated in vivo with respect to their water sorption and heat-resistance characteristics.
(11) Salt concentrations slightly lower than those providing inhibition tended to extend spore outgrowth time at low temperatures.
(12) The AL spores and the GN spores were morphologically distinct.
(13) Studies demonstrated the fact that there are present within the malignant cell and in the immediate area bacterial spores arising from one of several varieties of plant bacteria.
(14) The stages observed were diplokaryotic cells, sporogonial plasmodia, unikaryotic sporoblasts, and spores.
(15) The rod-shaped organism was motile, did not form spores, and had a gram-negative wall structure.
(16) Numerous factors influenced its activity: method of spore production, inherent spore resistance characteristics, alkalination, storage time and storage temperature.
(17) The inoculum level of infected spores in nutrient broth-yeast extract-glucose medium affected the transducing efficiency of SP-10 in lysates of these cultures.
(18) It can be dissociated from the spores using divalent metal chelators and will reassemble on the spores in the presence of calcium.
(19) Stable messenger ribonucleic acid (mRNA) was shown to be involved in both enterotoxin synthesis and synthesis of other spore coat proteins in Clostridium perfringens.
(20) Effects of alpha- or beta-D-glucose on the respiration of germinated spores (only germinated spores not including swollen spores and elongated spores) of Bacillus subtilis and B. megaterium were studied.