Results 171 to 180 of about 68,403 (207)

Evolution of pollen grains

The Botanical Review, 1936
If one examines a random collection of pollen grains, such as might be obtained from a sample of honey (1), the muddy bottom of a pond (10, 14), or from a sticky slide exposed to the winds (23), the forms encountered are surprisingly various, as various, in fact, as the plants which produced them. There may be the one-furrowed form of the magnolia, the
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Airborne Pollen Grains of Bozùyùk (Bilecik, Turkey)

Journal of Integrative Plant Biology, 2005
: Airborne pollen grains in the atmosphere of Bozuyuk were investigated over a 2 yr period from 2000 to 2001 using a Durham sampler. A total number of pollen grains of 5 170 pollen grains belonging to 32 taxa were identified and recorded along with some unidentified pollen grains. Of all the pollen grains, 78.66% were arboreal, 19.20% were non-arboreal,
Türe, Cengiz, Salkurt, E.
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Pollen grains and biosystematics

Canadian Journal of Botany, 1982
A review of the history of palynology and its usefulness in biosystematics, taxonomy, geology, and allergology is presented. In addition, its application to the taxonomic study of Plantago, Trifolium, Tamarix, Clarkia, and Suaeda as used by the staff at Agriculture Canada is summarized.
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Pollen grain morphology ofCoris (Primulaceae)

Plant Systematics and Evolution, 1993
Pollen grain morphology, sculpturing, and wall ultrastructure are investigated in two species ofCoris (Primulaceae),C. monspeliensis L. andC. hispanica Lange. The study includes both acetolysed and unacetolysed pollen. No evidence of any major palynological difference is recorded between these two species, apart from a somewhat larger pollen inC ...
Jose S. Carrion, Maria J. Delgado, Maria Garcia   +2 more
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Pollen grains in Palmae

Review of Palaeobotany and Palynology, 1967
The paper gives an account of Palmae pollen grains, which usually have a smooth sporoderm but rarely are spiny or warty. The sporoderm is spiny in the Pandanaceae and smooth in the Sparganiceae, families closely related to the Palmae. The classification of the Palmae into subfamilies as given by Drude (1889) and Moore (1960) has been taken as standard,
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The Cytoskeleton of Pollen Grains and Pollen Tubes

1992
The cytoskeleton is assumed to be involved in many internal functions of the eukaryotic cell, e.g. organelle movement, mitotic and meiotic division, cell morphogenesis and cell growth (Dustin, 1984; Bershadsky and Vasiliev, 1988). Examination of a broad variaty of mono- and dicotyledones has revealed the presence of microtubules and/or actin filaments ...
E. S. Pierson, Y. Q. Li
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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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HELMINTHIC OVA AND POLLEN GRAINS

The Lancet, 1969
A P, Killam, J G, Bergstrom, K, Urban
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The effects of climate change on respiratory allergy and asthma induced by pollen and mold allergens

Allergy: European Journal of Allergy and Clinical Immunology, 2020
Gennaro D'Amato, Nelson Rosario
exaly  

Composition and functionality of bee pollen: A review

Trends in Food Science and Technology, 2020
Mamta Thakur, Vikas Nanda
exaly