全文获取类型
收费全文 | 6599篇 |
免费 | 586篇 |
国内免费 | 13篇 |
出版年
2023年 | 60篇 |
2022年 | 109篇 |
2021年 | 224篇 |
2020年 | 116篇 |
2019年 | 201篇 |
2018年 | 207篇 |
2017年 | 177篇 |
2016年 | 232篇 |
2015年 | 333篇 |
2014年 | 328篇 |
2013年 | 435篇 |
2012年 | 508篇 |
2011年 | 458篇 |
2010年 | 300篇 |
2009年 | 229篇 |
2008年 | 333篇 |
2007年 | 340篇 |
2006年 | 294篇 |
2005年 | 281篇 |
2004年 | 206篇 |
2003年 | 188篇 |
2002年 | 230篇 |
2001年 | 161篇 |
2000年 | 195篇 |
1999年 | 140篇 |
1998年 | 66篇 |
1997年 | 35篇 |
1996年 | 52篇 |
1995年 | 61篇 |
1994年 | 38篇 |
1993年 | 43篇 |
1992年 | 77篇 |
1991年 | 62篇 |
1990年 | 61篇 |
1989年 | 70篇 |
1988年 | 46篇 |
1987年 | 37篇 |
1986年 | 42篇 |
1985年 | 46篇 |
1984年 | 29篇 |
1983年 | 23篇 |
1982年 | 12篇 |
1981年 | 18篇 |
1980年 | 12篇 |
1979年 | 16篇 |
1978年 | 14篇 |
1977年 | 12篇 |
1976年 | 8篇 |
1974年 | 6篇 |
1972年 | 6篇 |
排序方式: 共有7198条查询结果,搜索用时 15 毫秒
121.
Summary We report here an improved method for nuclei counting utilizing Triton-X 100 to reduce the size of cell debris, thereby allowing the use of a particle sizer/counter. Furthermore, nuclei are completely released within 30 seconds, as compared to 1 hour using hypotonic solution. The method is accurate above 0.3 × 106 cells/mL. 相似文献
122.
The substrate specificity of purified PKC-alpha, -beta and -gamma has been investigated. A series of synthetic peptides based upon the sequence surrounding serine-7 in glycogen synthase were generated and used to determine the basic residue requirements of these PKC isotypes. While PKC-alpha and -beta are indistinguishable in their phosphorylation of these peptides, PKC-gamma shows a distinct specificity profile for these synthetic substrates. 相似文献
123.
Interaction between corticosteroid binding globulin and activated leukocytes in vitro 总被引:1,自引:0,他引:1
G L Hammond C L Smith C M Underhill V T Nguyen 《Biochemical and biophysical research communications》1990,172(1):172-177
The interaction between human corticosteroid binding globulin and activated leukocytes is restricted to the granulocyte population, and is characterized by specific proteolytic cleavage of corticosteroid binding globulin which markedly reduces its steroid binding activity. A direct interaction between corticosteroid binding globulin and the activated cells appears to enhance this event, and does not involve cellular internalization of corticosteroid binding globulin or its proteolytic degradation products, which resemble those obtained after incubation of corticosteroid binding globulin with neutrophil elastase. These data suggest that corticosteroid binding globulin interacts with elastase on the surface of activated neutrophils, and may promote glucocorticoid delivery to these cells during inflammation. 相似文献
124.
Transabdominal fine needle aspiration biopsy of a solitary space-occupying lesion in the liver produced smears containing irregular bundles of smooth muscle cells with granular or fibrillary cytoplasm and slightly pleomorphic nuclei. In a few bundles, aggregates of mature fat cells were present, which is characteristic for an angiomyolipoma. Histologic examination of the resected mass showed it to be a solitary angiomyolipoma of the liver. The diagnosis was further confirmed by immunohistochemical and electron microscopic studies. 相似文献
125.
Twenty independent man-mouse (Cl1D,LA/TK-, HPRT-) and man-hamster (CH,HPRT-) hybrids using female human cells with balanced reciprocal translocation XX,t(X;5)(q21;q11) were analyzed for human genes localized on chromosome 5 (HEXB), on chromosome X (PGK, GALA, HPRT, G6PD) and for the different chromosomes in relation with the balanced reciprocal translocation (chr.5, chr.5q-, chr.Xq+, chr.X). The different results obtained indicate that the genes for human markers HEXB, PGK are on Xq+, and that the genes for human markers GALA, G6PD are on 5q-. These data implicate finally the following localizations: HEXB on 5q11 leads to 5qter; PGK on Xq21 leads to Xpter; GALA, HPRT, G6PD on Xq21 leads to Xqter. 相似文献
126.
Separation of dissociated thyroid follicular and parfollicular cells: association of serotonin binding protein with parafollicular cells
下载免费PDF全文
![点击此处可从《The Journal of cell biology》网站下载免费的PDF全文](/ch/ext_images/free.gif)
Parafollicular cells (PC) of the sheep thyroid gland are neural crest derivatives that synthesize and release the biogenic amine serotonin (5-HT) as well as the hormone calcitonin. The thyroid also contains a highly specific serotonin-binding protein (SBP). Separation of dissociated thyroid cells was done to study the cellular localization of SBP and to develop a means of isolating PC for study. Various methods were used to obtain an enriched and purified population of PC. Minced thyroid glands were enzymatically dissociated and the cells were layered on a Ficoll linear density gradient. Fractions obtained from the gradient were examined for cell number, viability, 5-HT concentration, SBP activity, and morphology by electron microscopy. One of the fractions was found to be enriched in PC. High levels of 5-HT and SBP were also found in this fraction, whereas these levels were low where the majority of cells were found. This PC-rich fraction, however, contained numerous follicular cells (FC); therefore, additional approaches to cell separation were used. FC can be stimulated in vitro with thyroid stimulating hormone (TSH) to become intensely phagocytic. When stimulated cells were incubated in the presence of silica microspheres, the FC engulfed the microspheres, which were toxic to them. PC did not become phagocytic and were unharmed by the microspheres. Suspended cells, after incubation with microspheres, were centrifuged on a discontinuous gradient, and a PC-rich fraction was obtained. Silica, however, interfered with analysis of SBP. Another method to take advantage of the phagocytic potential of FC was therefore used. TSH-stimulated cell suspensions were passed through a column of sepharose to which thyroglobulin had been coupled. Stimulated FC apparently adhered to the beads and were retained by the columns. Fractions eluting from the columns were greatly enriched with PC. These fractions contained high levels of 5-HT and SBP, and considerably reduced FC contamination was found by quantitative electron microscopy. It is concluded that SBP is localized to PC in the sheep thyroid. The idea that these cells resemble serotonergic neurons in their mechanisms of 5-HT storage is supported. 相似文献
127.
E. M. Lynch J. Wharton M. G. Bryant S. R. Bloom J. M. Polak MD MRCPath M. G. Elder 《Histochemistry and cell biology》1980,67(2):169-177
Summary VIP-like immunoreactive material is present in the female reproductive tract, with a distinct pattern of distribution. The highest concentrations of extractable material and immunoreactive nerve fibres were found in the cervix and vagina. In the cervix these fibres were seen below the surface epithelium and around cervical glands as well as in association with blood vessels and smooth muscle bundles. In the vagina the nerve fibres were most abundant in the superficial regions of the lamina propria. Scattered fibres were also present in the rest of the uterus and in the fallopian tubes. Chromatographic evidence indicates that this VIP-like material is of a similar molecular size to that extracted from other organs. Possible roles for VIP in the regulation of myometrial activity and of cervical and vaginal dilation and secretion are proposed. 相似文献
128.
Bean plants grown in a controlled temperature glasshouse athigh temperatures (33/28, 30/25, or 27/22 °C) during theperiod of seed development and maturation matured early andproduced small seeds. The seeds were of lower vigour than thosegrown at 21/16 or 18/13 °C. The detrimental effect of highmaturation temperatures was observed even on plants bearingwell-developed seeds (yellow, fleshy-pod stage). Seeds maturedat high temperatures were also more susceptible to deteriorationwith delay in harvest, and to mechanical damage. Heavy wateringof plants with seed ready to harvest caused a reduction in seedvigour. For optimum quality bean seed, it appears essentialthat the seed develops and matures at cool temperatures, ina dry environment. 相似文献
129.
Comparative ultrastructure of Mycobacterium leprae and Mycobacterium lepraemurium cell envelopes.
下载免费PDF全文
![点击此处可从《Journal of bacteriology》网站下载免费的PDF全文](/ch/ext_images/free.gif)
H T Nguyen D D Trach N V Man T H Ngoan I Dunia M A Ludosky-Diawara E L Benedetti 《Journal of bacteriology》1979,138(2):552-558
The structural properties of the cell envelopes of Mycobacterium leprae and Mycobacterium lepraemurium were investigated by freeze-fracture, freeze-etching, and negative-staining techniques. Freeze-fracture split the cell wall and exposed the internal features of the peptidoglycolipid mycosidic filamentous network. The cell membrane was also split into two asymmetric faces. The external fracture face was characterized by linear arrays of intramembranous particles, whereas the protoplasmic fracture face showed randomly distributed clusters of particulate entities. Comparative analysis of the ultrastructural features observed in M. leprae and M. lepraemurium indicated that the organization of the cell envelope in these two species differed particularly with respect to the amount and complexity of the superficial peptidoglycolipid and mycosidic integument, which is poorly developed in the mycobacterium responsible for human disease. 相似文献
130.