(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.
Sporangium
Definition:
(n.) A spore case in the cryptogamous plants, as in ferns, etc.
Example Sentences:
(1) This "belt," usually first observed toward the center of the sporangium, developed without changing thickness or appearance over the surface of the forespore.
(2) It is proposed that simple, eucarpic, monocentric chytrids which discharge zoospores following dissolution of the sporangium wall evolved into multipapilliate species of Rhizophydium and 2 lines of evolution from these species are documented with examples.
(3) The cytoplasmic sporangium cleavage is brought about by the fusion of flagellar sheaths and cleavage vesicles.
(4) The mature resting sporangium (RS) wall of Coelomomyces dodgei (Chytridiomycetes; Blastocladiales) consists of three principal layers: (I) an outer pigmented layer (1.8-2.2 microns) that contains polysaccharide, (II) a middle electron translucent layer (1.3-1.6 microns) comparatively free of polysaccharide, and (III) an inner layer (125 nm) rich in polysaccharide that surrounds the meiospores.
(5) By inference, the sporulation division septum locus is distal to the ultimate normal cell division septum, i.e., proximal to the "old" pole of the B. megaterium sporangium.
(6) With the progress of spore encapsulation, the tyrocidine production migrated from the soluble fraction into the forespore, terminating with the separation of forespores from the sporangium membrane.
(7) Similarity of these bodies to sporangium-like structures is suggested.
(8) Using a transcriptional fusion of the spoIVC gene to the lacZ gene of Escherichia coli, we found that spoIVC expression was turned on at the third to fourth hour of sporulation (at about the developmental stage [IV] that its products are required in spore formation) and that this transcription was largely restricted to the mother cell chamber of the sporangium.
(9) However, a decrease in bacterial toxicity occurred with sporangium lysis.
(10) The transcriptional activity of the two genomes of the sporangium during spore formation was determined by pulse-labeling bacteria with 3H-uracil at different times of sporulation and preparing them for high resolution autoradiography.
(11) It was placed into group 3 of the genus Bacillus on the basis of its cellular morphology, the morphology of the sporangium, and the location of the spore within the cell.
(12) This suggests that the selective incorporation into the sporangium of either the "older" or "younger" chromosome of a vegetative cell does not occur in the course of spore formation.
(13) To investigate whether expression of spoIIM is required in the forespore compartment of the sporangium, we have constructed a new integrational vector, pKSV7, which contains temperature-sensitive replication functions derived from pE194ts.
(14) The electronmicroscopic examination of the colony revealed sporangium containing spores and characteristic dense body and plastids in the spores.
(15) The ability of Achlya to incorporate [1-14C]acetate into lipid was maximal at the time of sporangium formation, and glycerides were the principal component of total lipid to become 14C-labelled at all stages of the life cycle.
(16) The transcellular electric current apparently plays no role in sporangium formation or in spore cleavage.
(17) The peritumoural region of a squamous cell carcinoma of the tongue when examined with light and electron microscope showed nodular bodies in the submucosa with all the distinctive features of 'sporangium and 'spores' of rhinosporidiosis.
(18) A septum within each sporangium divides the forespore from the basal or parasporal portion of the cell.
(19) Sporulation in Bacillus subtilis is a simple developmental system in which a single cell undergoes differentiation to two 'sister' cells, namely the prespore and the sporangium.
(20) Subsequently, the young cell elongates, becomes somewhat deformed, and then emerges through a narrow aperture in the inflexible coats of the spore, finally rupturing the sporangium.