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- W2020294047 abstract "Two microanalytical techniques were used to investigate the inorganic cation content and distributions in birch (Betula verrucosa Ehrh.) pollen. With intact pollen grains. X-ray microanalysis (EDX) could only give a mean ionic composition. Secondary Ion Microscopy and Spectrometry (SIMS) appeared to be a more suitable technique to image ion distributions in the different pollen structures. This was carried out with samples prepared using a new vapour phase technique designed to improve ion retention. Transmission electron microscopy (TEM)showed good structural preservation of the samples. Monovalent ion (K+, Na+) distribution showed features different from those of the divalent cations (Ca2+, Mg2+). In the vegetative cell, the alkaline cations were mainly distributed in the most internal part of the cytoplasm and they were probably associated with starch grains or concentrated in dry vacuoles. Calcium distribution correlated well with the areas in the cytoplasm of the vegetative cell containing a dense network of mitochondria and endoplasmic reticulum. Within the pollen grain, the sperm cell appeared to contain the most calcium. Calcium was also abundant in the sporoderm. These results reveal the potential of SIMS for pollen studies that include germination, the monitoring of air pollutants and the allergens-ion interactions." @default.
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- W2020294047 date "1997-10-01" @default.
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- W2020294047 title "SIMS Investigation of the Distribution of K<sup>+</sup>, Na<sup>+</sup>, Mg<sup>2+</sup>and Ca<sup>2+</sup>Cations in Birch Pollen" @default.
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- W2020294047 doi "https://doi.org/10.1111/j.1438-8677.1997.tb00653.x" @default.
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