Results 281 to 290 of about 147,314 (297)
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2014
Pollen grains only represent a small fraction of the total amount of the viable biological particles present in the air, but pollen are the most important aeroallergens in the outdoor environment. The analysis of pollen has traditionally been carried out by microscopy, which can be traced back to the 17th century.
Matt Smith +3 more
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Pollen grains only represent a small fraction of the total amount of the viable biological particles present in the air, but pollen are the most important aeroallergens in the outdoor environment. The analysis of pollen has traditionally been carried out by microscopy, which can be traced back to the 17th century.
Matt Smith +3 more
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Pollen and Pollen Tube Proteomics
2007Germinated pollen grains form pollen tubes that accomplish rapid polar- ized growth within female gametophytic tissues in order to deliver the sperm cell to the ovule. This process is essential for successful plant fertilization in vivo. Pollen tubes are considered to be an ideal model system to study tip growth. A more com- prehensive understanding of
Nils Böhm +5 more
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Cryopreservation of Pollen and Pollen Embryos, and the Establishment of Pollen Banks
1987Publisher Summary The cryopreservation of pollen plays an important role in hybridization programs and in the conservation of genetic resources in agricultural and forest biotechnology. In addition to the several potentials outlined, the most important aspect is the storage of “recalcitrant” pollen of important fruit and forest trees and agricultural
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Reevaluation of pollen quantitation by an automatic pollen counter
Allergy and Asthma Proceedings, 2010Accurate and detailed pollen monitoring is useful for selection of medication and for allergen avoidance in patients with allergic rhinitis. Burkard and Durham pollen samplers are commonly used, but are labor and time intensive. In contrast, automatic pollen counters allow simple real-time pollen counting; however, these instruments have difficulty in ...
Kunihiko Yokota +9 more
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Allergenic Pollen and Pollen Allergy in Europe
2017Aerobiological and allergological studies show that the pollen map of Europe is changing also as a result of cultural factors (e.g., importation of plants such as birch and cypress for urban parklands), greater international travel (e.g., colonization by ragweed in France, northern Italy, Austria, Hungary, etc.) and climate change.
D'amato G. +5 more
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Dynein-related polypeptides in pollen and pollen tubes
Sexual Plant Reproduction, 1996Microtubules in pollen tubes are evident within the vegetative and generative cell cytoplasm. This observation led to the formulation of several hypotheses regarding the role of microtubules in cytoplasmic movement and the migration of the vegetative nucleus/generative cell along the pollen tube. The study of microtubular motor proteins in pollen tubes
Moscatelli A. +4 more
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American Journal of Botany, 1990
Using pairs of pollen donors, I analyzed the growth of pollen tubes growing in different channels of the same style in Erythronium grandiflorum. After 24 hr the length of pollen tubes of randomly selected pollen donors was affected by the presence of other donors.
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Using pairs of pollen donors, I analyzed the growth of pollen tubes growing in different channels of the same style in Erythronium grandiflorum. After 24 hr the length of pollen tubes of randomly selected pollen donors was affected by the presence of other donors.
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The Utilization of Pollen and Pollen Substitutes by the Honeybee
Journal of Economic Entomology, 1926Pollen―a substance produced by flowers of plants and collected by bees―is the chief source of protein food of these insects. A lack of pollen causes a cessation or a slackening of brood-rearing, while pollen coming to the hive acts as a stimulus to brood-rearing. When there is a plentiful supply of pollen in the hive and other conditions are favorable,
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The Cytoskeleton of Pollen Grains and Pollen Tubes
1992The 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 ...
Y. Q. Li, E. S. Pierson
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