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Transcytosis is a form of specialized transport through which an extracellular cargo is endocytosed, shuttled across the cytoplasm in membrane‐bound vesicles, and secreted at a different plasma membrane surface. This important process allows membrane‐impermeable macromolecules to pass through a cell and become accessible to adjacent cells and tissue compartments. Transcytosis also promotes redistribution of plasma membrane proteins and lipids to different regions of the cell surface. Here we review transcytosis and highlight in vivo studies showing how developing epithelial cells use it to change shape, to migrate, and to relocalize signaling molecules. 相似文献
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Karyotypes of ten species belonging to four of the five subgroups of the immigrans species group of Drosophila were examined. The group includes species with the most primitive form of karyotype as well as species with so-called recent karyotypic configurations. It is an assemblage of species with karyotypes representing five of the six successive stages involved in the evolution from 2n=12 to 2n=6. Implications of these findings are discussed. 相似文献
445.
Summary Six (four Hindus, one Sikh, and one Muslim) out of 213 individuals originating from different parts of the Indian subcontinent (namely, Andhra Pradesh, Maharashtra, Uttar Pradesh, East Punjab, and West Punjab) were found to be Calcutta-1 (CAL1) variants of lactate dehydrogenase (LDH). The CAL1 variant was originally described (and thus, generally believed at present) as an allelic variant at the LDHA locus in chromosome 11. By using an improved Cellogel electrophoretic procedure the isozyme patterns observed in the erythrocytes and leukocytes of the variant have indicated that the CAL1 is not a variant of LDHA but that of LDHB, a chromosome 12 marker. This suggestion was supported by the isozyme patterns of LDH in a set of segregating clones of man-mouse somatic cell hybrids with the variant as human partner. Moreover, the variant cosegregated consistently with the human chromosome 12 and with the markers firmly assigned to the latter but not with human chromosome 11 or its markers in these hybrids. These results confirmed that the CAL1 is an LDHB variant. 相似文献
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Growth promotion ability of zoysiagrass rhizosphere fungi in consecutive plantings of wheat and soybean 总被引:1,自引:0,他引:1
Manchanahally Byrappa Shivanna Manchanahally Shivanna Meera Koji Kageyama Mitsuro Hyakumachi 《Mycoscience》1996,37(2):163-168
Several isolates ofPhoma sp., certain nonsporulating fungi, as well asPenicillium andTrichoderma, all isolated from zoysiagrass rhizosphere, promoted growth of wheat and soybean under greenhouse conditions. However, the
ability of these rhizosphere fungi to enhance plant growth varied with the crop tested. For example, most of the fungi effectively
promoted the growth of wheat, whereas only a few fungi were effective on soybean. In consecutive plantings of wheat and soybean
grown in soil previously infested with these zoysiagrass rhizosphere fungi, the growth promotion ability of the fungi was
lowered. However, addition of fresh potting medium appeared to restore their growth-promotive effects. It appears that the
activation of plant growth-promoting fungi in soil might depend on the availability of organic substrates to colonize, as
evidenced by the promotion of plant growth. 相似文献
449.
Summary A panel of twenty independently derived clones of man-mouse somatic cell hybrids isolated from fusions involving eight different parent cell combinations simultaneously analyzed for human chromosomes, citrate synthase, and a large number of other enzyme markers firmly or tentatively assigned to individual human chromosomes have provided direct evidence for a firm assignment of the structural gene coding for citrate synthase (CS) to human chromosome 12. 相似文献
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