Results 131 to 140 of about 1,547 (176)

Substructural study of sporogenesis in Streptomyces griseus

Zeitschrift für allgemeine Mikrobiologie, 1984
AbstractA Streptomyces griseus strain deficient in the formation of aerial mycelium and arthrospore development (Amy−) was studied by electron microscopy and compared with the sporulating parental strain (Amy+). The investigations were performed with colonies grown on solid medium.
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Sporogenesis in Conifers

1989
Publisher Summary In a microsporangium there are several hundred sporogenous cells that consequently yield many pollen grains, while in a megasporangium the single tetrad is formed from only one. The term sporogenous cell may then be applied to any destined to give rise to a meiotic cell once the archaesporium has differentiated, the remainder ...
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Sporogenesis and gametogenesis in some Cyperaceae

Proceedings / Indian Academy of Sciences, 1976
The paper is an account of some salient embryological features in four genera and five species belonging to the family Cyperaceae (Eleocharis atropurpurea, E. congesta, Fimbristylis tetragona, Fuirena trilobites andScirpus lateriflorus). InE. atropurpurea double pollen grains are occasionally observed. Their significance in systematic considerations of
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Accumulation of Free Proline during Yeast Sporogenesis

Nature, 1963
ALTHOUGH the composition of the pool of free amino-acids in the yeast cell has been much investigated, this has been done using commercially supplied yeast1,2 or vegetative cells from growth cultures3,4. No work has been reported on the amino-acid content of sporulated cells. We have undertaken to compare vegetative, sporulating and sporulated cells in
C, RAMIREZ, J J, MILLER
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Regulation of Bacterial Sporogenesis

1982
Previous speakers have stressed some important features of gene expression and regulation in different eukaryotic systems. My communication will deal with similar problems but revealed in a prokaryotic system, endowed with the properties to undergo differentiation.
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Sporogenesis, gametogenesis, and progamic phase in Alstroemeria

Canadian Journal of Botany, 1996
The sexual reproduction biology of Alstroemeria was studied histologically. The processes of sporogenesis and gametogenesis were described in relation to the development of the male and female organs. Comparative developmental stages in Alstroemeria take much longer than they do in tobacco.
de Jeu, M.J., Garriga Caldere, F., van Went, J.L.   +2 more
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The response of sporogenesis in Bacillus subtilis to acriflavine

Canadian Journal of Microbiology, 1968
Previous studies demonstrated that acriflavine treatment of early log phase cells of Bacillus subtilis produced both stable oligosporogenic and asporogenic mutants in high yield. More recently it has been demonstrated that high numbers of oligosporogenic mutants, believed to be defective for a regulatory gene, were found consistently after acriflavine
M, Rogolsky, R A, Slepecky
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Sporogenesis and Pollen Grain Formation

1981
Pollen grains and the spores of nonseed vascular plants1 develop from diploid somatic cells in a largely identical way. Ultimately, the cells are characterized by a highly ordered cell wall, the so-called sporoderm (Figs. 1 and 2). Both the chemical and the principal ultrastructural features of sporoderms show little Variation in different taxa ...
Brigitte Buchen, A. Sievers
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Sorus Ontogeny and Sporogenesis in Some Smut Fungi

Australian Journal of Botany, 1975
Investigations of sorus ontogeny and sporogenesis in the type species of Ustilago and Sorosporium and in other species usually included in those genera have established criteria far defining Ustilago and Sorosporium. Ustilago is a genus to accommodate smuts that destroy host tissues and whose mycelium is converted entirely to spores after necrosis of ...
Langdon, R. F.N., Fullerton, R. A.
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Sporogenesis and Prothallial Development in Ceratopteris thalictroides

Botanical Gazette, 1960
1. The prothalli of Ceratopteris thalictroides (L.) Brongn. were hermaphroditic in culture as well as in nature (14). They were asymmetric and irregularly lobed. 2. Prothalli bearing only antheridia, as reported by Kny (12), were also obtained in cultures, but in extremely small proportions. Prothalli with archegonia only were not found. 3. Development
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