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121.
Dennis WM. Stevenson 《Brittonia》1992,44(2):220-223
My previously published provisional classification of the Cycadales is here formally published. This classification is based upon a cladistic analysis of characters ranging from gross morphology to phytochemistry. Encephalartos is lectotypified. 相似文献
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Bo Chang Richard S Smith Maureen Peters Olga V Savinova Norman L Hawes Adriana Zabaleta Steven Nusinowitz Janice E Martin Muriel L Davisson Constance L Cepko Brigid LM Hogan Simon WM John 《BMC genetics》2001,2(1):1-12
Background
Glaucoma is a common disease but its molecular etiology is poorly understood. It involves retinal ganglion cell death and optic nerve damage that is often associated with elevated intraocular pressure. Identifying genes that modify glaucoma associated phenotypes is likely to provide insights to mechanisms of glaucoma. We previously reported glaucoma in DBA/2J mice caused by recessive alleles at two loci, isa and ipd, that cause iris stromal atrophy and iris pigment dispersion, respectively. A approach for identifying modifier genes is to study the effects of specific mutations in different mouse strains. When the phenotypic effect of a mutation is modified upon its introduction into a new strain, crosses between the parental strains can be used to identify modifier genes. The purpose of this study was to determine if the effects of the DBA/2J derived isa and ipd loci are modified in strain AKXD-28/Ty. 相似文献123.
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Purification and partial characterisation of beet mild yellowing virus and its serological detection in plants and aphids 总被引:4,自引:0,他引:4
D. A. GOVIER 《The Annals of applied biology》1985,107(3):439-447
Beet mild yellowing virus (BMW) was reversibly precipitated at temperatures below about 5°C and this property was used as a final step in a purification procedure which yielded about 1 mg virus/kg tissue. Purified virus was infective and had an A200/A280 ratio of about 1–8. BMW particles were isometric with a diameter of 26 nm, sedimented at 116 S, had a buoyant density in caesium chloride of 1.42 g/cm3 and a coat protein mol. wt of 25 400. An antiserum to BMW had a titre in immunodiffusion tests of 1/256 and was used in immunodiffusion tests, immunospecific electron microscopy (ISEM) and enzyme-linked immunosorbent assay to demonstrate a close serological relationship between BMW and beet western yellows virus. BMW was readily detected by ISEM in plants and also in aphid vectors after treatment of aphid extracts with a chloroform:butanol mixture. 相似文献
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HEMIPARASITIC NUTRITION IN ANGIOSPERMS 总被引:2,自引:0,他引:2
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