(1) Mature sporangia comprised about 30% of the total, were usually unilamellar, 100-400 microns in diameter, and contained a mixture of immature and mature endospores.
(2) The pattern of differential inhibition exhibited by sporangia versus zoospores upon treatment with actinomycin D, 4-FLUOROURACIL, OR CYCLOHEXIMIDE INDICATED THat continued translation on preformed messenger RNA may be one essential requirement for the formation and release of zoospores, whereas their subsequent germination and development may depend upon renewed transcription as well.
(3) An additional protease, f (Mr about 15 000) appears transiently in sporangia at about the time of spore release.
(4) The activities of phosphofructokinase (PFK), fructose diphosphatase (FDP), nicotinamide adenine dinucleotide (NAD) and NAD phosphate (NADP)-linked isocitrate dehydrogenases (IDHNAD, IDHNADP), two NAD-linked glutamate dehydrogenases (GDH1, GDH2), and isocitrate lyase were studied during the development of the two phenotypes, ordinary colorless and resistant sporangia (OC and RS plants), of water mold Blastocladiella emersonii in synchronized liquid cultures.
(5) Recoveries of third stage Dicytocaulus viviparus larvae (L3) from Pilobolus species sporangia ranged from 23 per cent at 21 days to 3 per cent after 90 days for sporangia attached to polythene discs positioned on pasture.
(6) Therefore, it seems that old (labeled) chromosomes segregate randomly with respect to both the morphological and genealogical polarities of sporangia.
(7) In the presence of incandescent light, each aggregate develops into a structurally complex fruiting body, possessing a stalk and several sporangia.
(8) This observation coupled with the capacity of sporangia of the race affected (1.2.3.4) for the uptake and interconversion of purines, as demonstrated by experiments with labelled purines under in vivo and in vitro conditions, pointed to hypoxanthine as a key intermediate in the purine metabolism directly associated with spore formation and development.
(9) Transfer ribonucleic acids from sporulating cells, spores, sporangia, or stationary-phase asporogenous mutants of Bacillus subtilis all showed a deficiency in the 3'-terminal adenosine moiety.
(10) Continuous urografin gradients separated out the critical stages of germinating sporangia giving four bands, each band representing a consecutive stage of germination.
(11) These features are the presence of hydrogenosomes at all stages of the life cycle, the presence in rhizoids and sporangia of characteristic crystals coated with hexagonal arrays of particles, and in zoospores the presence of distinct surface layers on the motility organelles and cell body respectively, the organization of the ribosomes into helical and globular arrays and the structures associated with the kinetosomes.
(12) Sufficient inducer was present in the normal diet of the host animal to trigger the differentiation and release of the zoospores from all the sporangia of each phycomycete species present in the rumen fluid tested.
(13) The frequency of association of spore loci with the "old" and "new" ends of rod-shaped sporangia in batch cultures of Bacillus megaterium ATCC 19213 was estimated by phase contrast microscopy.
(14) Changes in the fluorescence characteristics during the developmental stages of fern sporangia can be attributed to the changes in the chemical composition of the cell wall.
(15) Because these obligate bacterial parasites of nematodes have not been cultured axenically, the taxonomic relationships described here for each species are based mainly on developmental morphology, fine structure of the respective sporangia and endospores, and their pathogenicity on nematode species.
(16) The mechanism of flagellar degeneration differs from that observed in directly germinating sporangia.
(17) In Pythium species and in several related Oomycetes, polymerase chain reaction (PCR) amplification of the nontranscribed spacer (NTS) region with one primer specific for the 5S gene revealed, with several exceptions, that the 5S rRNA gene was present in the rDNA repeat of those species with filamentous sporangia and was absent from the rDNA repeat of those with globose or unknown sporangia.
(18) We suggest that the multilamellar bodies are precursors of trophocytes and sporangia.
(19) the poles formed by divisions occurring prior to those forming the sporangia.
(20) The further sporangia attached to the plant particles were from the rumen, the more likely they were to be devoid of spores.
Sporangiophore
Definition:
(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.