Results 161 to 170 of about 243,024 (208)
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Staining Germinating Pollen and Pollen Tubes
Stain Technology, 1958Germinating pollen on stigmas and pollen tubes in styles of Antirrhinum, Brassica, Oenothera, Raphanus, Rosa, solatium and Tagetes spp. were prepared for examination as follows: The styles were fixed in ethyl alcohol-acetic acid 3:1 for 1 hr, and hydrolyzed at 60°C for 5 to 60 min (depending on the species) in 45% acetic acid.
L A, DIONNE, P B, SPICER
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Pyrrolizidine alkaloids in pollen and pollen products
Molecular Nutrition & Food Research, 2010AbstractRecently, 1,2‐dehydropyrrolizidine alkaloid (PA) ester alkaloids, found predominantly as their N‐oxides (PANOs, pyrrolizidine N‐oxides), have been reported in both honey and in pollen obtained directly from PA plants and pollen loads collected by bees, raising the possibility of health risks for consumers of these products.
Michael, Kempf +8 more
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Experientia, 1993
This review deals first with basic knowledge about pollen, especially its biology, morphology and physiology, and then discusses the connection of pollen with medical problems such as hay fever (pollinosis). The next sections cover the historical development of methods for trapping and counting airborne pollen grains to produce reliable quantitative ...
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This review deals first with basic knowledge about pollen, especially its biology, morphology and physiology, and then discusses the connection of pollen with medical problems such as hay fever (pollinosis). The next sections cover the historical development of methods for trapping and counting airborne pollen grains to produce reliable quantitative ...
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1960
In 1694, Camerarius reported that anthers play the role of male sexual organs in plants (Maheshwari, 1950). Later, AMICI observed pollen tubes travelling through the stigma and style of Portulaca oleracea and in 1830 he concluded that pollen tubes elongate and ultimately come in contact with the ovule (Maheshwari, 1950). Since then the work of numerous
B. M. Johri, I. K. Vasil
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In 1694, Camerarius reported that anthers play the role of male sexual organs in plants (Maheshwari, 1950). Later, AMICI observed pollen tubes travelling through the stigma and style of Portulaca oleracea and in 1830 he concluded that pollen tubes elongate and ultimately come in contact with the ovule (Maheshwari, 1950). Since then the work of numerous
B. M. Johri, I. K. Vasil
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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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POLLEN PREVALENCE AND POLLEN-FREE AREAS
Journal of the American Medical Association, 1952The essential objective in atmospheric pollen research is to learn how much of what kinds of allergenic pollen are likely to be inhaled by sensitized persons at any time and in any locality. This objective may be amplified in further detail as follows: (1) to assist in the clinical evaluation, locally and generally, of known allergenic pollens, (2) to ...
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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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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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Theoretical and Applied Genetics, 1992
In recent years a large number of reports have been published hinting about the possible role of selection at the male gametophyte level in natural conditions and its possible use as a tool in plant breeding programs. In this work, the evidence that has so far emerged on gametophytic selection is reviewed, and its relationship to pollen competition ...
Hormaza Urroz, José Ignacio +1 more
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In recent years a large number of reports have been published hinting about the possible role of selection at the male gametophyte level in natural conditions and its possible use as a tool in plant breeding programs. In this work, the evidence that has so far emerged on gametophytic selection is reviewed, and its relationship to pollen competition ...
Hormaza Urroz, José Ignacio +1 more
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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 ...
Mutarifu, Muradil +9 more
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