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《Acta Botanica Sinica》2001,(12)
Ｎｏ .1(Ｊａｎ .,2 0 0 1)ＡＲｅｗａｒｄｉｎｇＦｉｆｔｅｅｎＹｅａｒｓ:ＦｒｏｍＳＬＧｔｏＳＣＲ/ＳＰ11ＣＵＩＨａｉ＿Ｙａｎｇ ,ＬＡＩＺｈａｏａｎｄＸＵＥＹｏｎｇ＿Ｂｉａｏ……………………………………………… ( 1)ＴｈｅＳｔｒｕｃｔｕｒａｌＴｒａｎｓｆｏｒｍａｔｉｏｎｏｆＮｕｃｌｅｏｌａｒＤＮＡａｎｄＩｔｓＡｒｒａｎｇｅｍｅｎｔｉｎＮｕｃｌｅｏｌｕｓｏｆＡｌｌｉｕｍｃｅｐａＣｅｌｌｓ (ｉｎＥｎｇｌｉｓｈ)ＴＡＯＷｅｉ,ＺＨＡＮＧＬｉ＿Ｙｏｎｇ ,ＨＵＡＮＧＢａｉ＿Ｑｕ ,ＪＩＡＯＭｉｎｇ＿Ｄａ ,ＨＥＭｅｎ… 相似文献
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X. C. ZHANG 《植物研究》1998,18(1):107-117
ＧＥＮＵＳＡＮＴＲＯＰＨＹＵＭＫＡＵＬＦ．ＦＲＯＭＣＨＩＮＡＡＮＤＮＥＩＧＨＢＯＲＩＮＧＲＥＧＩＯＮＳＸ．Ｃ．ＺＨＡＮＧ（Ｔｈｅｈｅｒｂａｒｉｕｍ（ＰＥ）,ＩｎｓｔｉｔｕｔｅｏｆＢｏｔａｎｙ,ＣｈｉｎｅｓｅＡｃａｄｅｍｙｏｆＳｃｉｅｎｃｅｓ,Ｂｅｉ... 相似文献
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筛选得到一株高产β－１,４－聚糖酶的耐碱性芽孢杆菌Ａ－３０,其固体发酵（Ｓｏｌｉｄ ｓｔａｔｅ ｆｅｒｍｅｎｔａｔｉｏｎＳＳＦ）时最适培养条件：起始ｐＨ为８．０、培养温度３２℃、１０％（ｖ／ｗ）接种量,含水量为６６．６％（ｖ／ｗ）,以０．５％的ＮａＮＯ_３为无机氮源,发酵９６ｈ,木聚糖酶活可达６４５７ＩＵ／ｇ（Ｄｒｙ ｂａｃｔｅｒｉａｌ ｂｒａｎ）,纤维素酶活（ＣＭＣａｓｅ）可以达到１８．６６ＩＵ／ｇ。氮源组成、温度、ｐＨ及发酵时间等对Ａ－３０所产木聚糖酶和纤维素酶比例有较大影响。葡萄糖对Ａ－３０的阻遏效 相似文献
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草坪主要杂草普通蓼的危害及防除周兴文（沈阳大学师范学院,沈阳１１００１５）ＩＮＶＡＳＩＯＮＡＮＤＣＯＮＴＲＯＬＯＦＭＡＩＮＳＰＥＣＩＥＳＯＦＬＡＷＮＷＥＥＤＳＰＯＬＹＧＯＮＵＭＨＵＭＩＦＵＳＵＭＺｈｏｕＸｉｎｇｗｅｎ（Ｔｅａｃｈｅｒｓｃｏｌｅｇｅｏ... 相似文献
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Summary The differentiation of the spermatid, especially in reference to the formation of the flagellum, and transformation of the shape of the nucleus was investigated in the domestic fowl.In the early stage of the spermatid, a prominent Golgi apparatus appears around the centrioles. The Golgi vesicles then surround the axial-filament complex which develops from the distal centriole. These vesicles fuse to form continuous membrane at the earliest stage of flagellar formation, and in the succeeding stage Golgi lamellae are attached to the plasma membrane of the developing flagellum. From these observations, it is assumed that Golgi apparatus may be a source of the membrane system of the flagellum.The microtubules distributed around the nucleus form the circular manchette. The anterior region of the nucleus with the manchette is cylindrical in shape and the posterior region without it remains irregular in shape. When the circular manchette has been completed, the whole nucleus acquires a slender cylindrical shape. The circular manchette then changes into the longitudinal manchette. The nuclei of spermatids without a longitudinal manchette are abnormal in shape. In view of these observations it is assumed that the nuclear shaping of the spermatid may be accomplished by circular manchette and the maintenance of shape of the elongated nucleus by longitudinal manchette.The authors wish to thank Mr. Takayuki Mori for his helpful suggestions and technical advices 相似文献
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K. Hausmann 《Protoplasma》1979,100(2):199-213
Summary The membranes of the pellicle of the ciliatePseudomicrothorax dubius are investigated using thin section electron microscopy and freeze-fracture replicas. The plasma membrane is covered by a surface coat and is connected to the outer alveolar membrane by short, sometimes branched, bridges. The inner alveolar membrane is coated on both sides. The epiplasm lies in intimate contact with the cytoplasmic surface of this membrane, and there is a corresponding deposit on the other surface. This deposit is regularly striated.The epiplasmic layer and the alveoli are interrupted at sites of cytotic activity,e.g., the attachment sites of trichocysts, the cytoproct, and the parasomal sacs. The striated deposit ends where the epiplasm ends, indicating a direct relationship between these two epimembranous layers.There is a deposit along the sides of the first part of the tip of the trichocysts, and in this region the trichocyst membrane is free of intramembranous particles.The membrane of the parasomal sacs has a coat on both surfaces. That on the extraplasmic surface is similar to the surface coat of the plasma membrane. The origin of the cytoplasmic coat is unknown. The cytotic activity of these sacs is indicated by their highly irregular profiles. 相似文献
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Summary The choriocapillaris is a fenestrated capillary bed located posterior to the retinal pigment epithelium. It serves as the main source of supply to the photoreceptors, retinal pigment epithelium, and other cells of the outer retina. The permeability of these capillaries to intravenously injected ferritin (MW — approx. 480,000; mol. diam. 11 nm) was examined in the mouse, rabbit, and guinea pig, each of which is characterized by a different type of retinal vascularization. In all three species, the bulk of the ferritin remained in the capillary lumina, where it appeared to be blocked at the level of the diaphragmed fenestrae. Some ferritin was present in endothelial cell vacuoles. The results confirm previous work on the rat choriocapillaris and indicate that the barrier function of the choriocapillary endothelium is present even among species in which the retinal circulation differs significantly.Supported by NIH grant EY03418 相似文献
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