Results 81 to 90 of about 130 (111)
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Journal of Theoretical Biology, 1985
The theories of formal languages and reproducing automata combined with the knowledge about individual development of Micrasterias cells (Chlorophyta, Conjugatophyceae) provide a new approach to embryological problems. The morphogenesis and even speciation of Micrasterias can be simulated with simple methods and, furthermore, simulations of development
Pasi Pohja, Juhani Lehtonen
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The theories of formal languages and reproducing automata combined with the knowledge about individual development of Micrasterias cells (Chlorophyta, Conjugatophyceae) provide a new approach to embryological problems. The morphogenesis and even speciation of Micrasterias can be simulated with simple methods and, furthermore, simulations of development
Pasi Pohja, Juhani Lehtonen
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Conjugates (Charophyta, Conjugatophyceae) of the Kader bog (Leningrad region, Kurgalsky reserve)
Issues of modern algology (Вопросы современной альгологии), 2021The Kurgalsky Nature Complex Reserve is located in the Kingisepp District of the Leningrad Region, 45 km northwest of Kingisepp. The territory of the reserve includes the Kurgalsky peninsula, as well as the adjacent waters of the Gulf of Finland. The Kader swamp massif is located in the south of the Kurgalsky Peninsula.
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A NewEuastrumSpecies (Conjugatophyceae, Streptophyta) from the Western Desert of Egypt
Cryptogamie, Algologie, 2018Abstract An Euastrum species (Conjugatophyceae, Streptophyta) was found in an agricultural ditch fed by a rheocrenic, slightly-hot spring ‘Ain El-Balad’ in the El-Farafra Oasis, Western Desert of Egypt. Morphotaxonomic diagnosis and autecology of this desmid species are hereby documented in detail and compared to other morphologically similar species ...
Saber A. A. +3 more
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Plant, Cell & Environment, 1988
Abstract. The division rate of Micrasterias torreyi cells grown under continuous illumination first accelerated but soon slowed down, and the cells lost their ability to divide after about 1 month. During the treatment the cells became pale green, the pyrenoids became fewer in number and defects appeared in the chloroplasts.
J. LEHTONEN, P. VUORIO, J. MAKI
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Abstract. The division rate of Micrasterias torreyi cells grown under continuous illumination first accelerated but soon slowed down, and the cells lost their ability to divide after about 1 month. During the treatment the cells became pale green, the pyrenoids became fewer in number and defects appeared in the chloroplasts.
J. LEHTONEN, P. VUORIO, J. MAKI
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Cultivation and inorganic carbon uptake of the rare desmidOocardium stratum(Conjugatophyceae)
Phycologia, 2014The desmid Oocardium stratum is sporadically and exclusively found in active meteogene travertine habitats. The restriction to these peculiar biotopes is probably linked to specific carbon requirements. We studied inorganic carbon (Ci) uptake under controlled laboratory conditions. First, we developed a method for isolating and cultivating O.
Schagerl, Michael, Wukovits, Julia
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Intercellular Communication During Sexual Reproduction of Closterium (Conjugatophyceae)
Journal of Plant Research, 2000were reviewed. In the case of Closterium peracerosum-strigosum-littorale complex, two sex-specific pheromones and their receptors were involved in sexual reproduction. These pheromones were glycoproteins and the expression of corresponding genes was critically regulated by the sex and environmental conditions.
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Plant Systematics and Evolution, 1981
Filaments ofPhymatodocis nordstedtiana Wolle were isolated from a sample of a Texan lake. Cultures were established and examined by light and scanning electron (SEM) as well as transmission electron microscopy (TEM). It is shown that the pores apparent on light microscopical examination are not of the cosmaroid type as expected.
Monika Engels, D. W. Lorch
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Filaments ofPhymatodocis nordstedtiana Wolle were isolated from a sample of a Texan lake. Cultures were established and examined by light and scanning electron (SEM) as well as transmission electron microscopy (TEM). It is shown that the pores apparent on light microscopical examination are not of the cosmaroid type as expected.
Monika Engels, D. W. Lorch
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Diversity of the green algal genusSpirogyra(Conjugatophyceae) in the Hawaiian Islands
Phycologia, 2018Abstract Identification of species in the green algal genus Spirogyra is complicated by cryptic morphological diversity, seasonality of critical features of sexual reproduction necessary for morphological identification, the presence of polyploid species groups and a lack of molecular sequence data tied to authentic specimens.
Alison R. Sherwood +3 more
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A Checklist of Desmids (Conjugatophyceae, Chlorophyta) of Serbia. III. GenusStaurastrum
Cryptogamie, Algologie, 2011Abstract The first data about the distribution of desmids in Serbia derive from the year 1883 and from that time up to the end of 2010 there were identified 646 different taxa. The species-rich genus Staurastrum is represented with 116 taxa which is about 18% of the total number of desmids in Serbia.
Sanja Fužinato +2 more
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