全文获取类型
收费全文 | 3221篇 |
免费 | 268篇 |
国内免费 | 104篇 |
专业分类
3593篇 |
出版年
2024年 | 10篇 |
2023年 | 84篇 |
2022年 | 136篇 |
2021年 | 202篇 |
2020年 | 119篇 |
2019年 | 165篇 |
2018年 | 172篇 |
2017年 | 108篇 |
2016年 | 109篇 |
2015年 | 151篇 |
2014年 | 272篇 |
2013年 | 302篇 |
2012年 | 154篇 |
2011年 | 151篇 |
2010年 | 148篇 |
2009年 | 148篇 |
2008年 | 172篇 |
2007年 | 126篇 |
2006年 | 101篇 |
2005年 | 109篇 |
2004年 | 88篇 |
2003年 | 77篇 |
2002年 | 76篇 |
2001年 | 46篇 |
2000年 | 39篇 |
1999年 | 20篇 |
1998年 | 32篇 |
1997年 | 23篇 |
1996年 | 25篇 |
1995年 | 21篇 |
1994年 | 20篇 |
1993年 | 17篇 |
1992年 | 14篇 |
1991年 | 15篇 |
1990年 | 13篇 |
1989年 | 16篇 |
1988年 | 24篇 |
1987年 | 11篇 |
1986年 | 9篇 |
1985年 | 12篇 |
1984年 | 12篇 |
1983年 | 9篇 |
1982年 | 9篇 |
1981年 | 3篇 |
1980年 | 6篇 |
1979年 | 3篇 |
1978年 | 3篇 |
1976年 | 3篇 |
1975年 | 3篇 |
1973年 | 2篇 |
排序方式: 共有3593条查询结果,搜索用时 15 毫秒
1.
Evangelia Jockers-Wretou Valya Russanova Christo Venkov 《Molecular biology reports》1988,13(3):123-131
In a recent publication the isolation and some characteristics of an anti-histone 3 monoclonal antibody, 1GB3 were described (Muller et al. FEBS Lett. 182: 459–464, 1985). We now report that the epitope recognized is phylogenetically conserved and located in the N-terminal part of H3, most likely between residues 40 and 50. Using the ELISA technique we found this region to be accessible in chromatin to the monoclonal antibody. The effect of non-ionic detergents on the adsorbtion of chromatin on microtiter plates was studied in this context.Immunological analysis of the reaction of the monoclonal antibody with chromatin by immunoinhibition and immunosedimentation shows that the H3 epitope is accessible in both folded and unfolded chromatin fibre as well as in high- and low-molecular weight oligonucleosomes.Abbreviations BSA
Bovine srum albumin
- mab
Monoclonal antibody
- PBS
Phosphate buffered saline
- PMSF
Phenylmethyl sulfonyl fluoride 相似文献
2.
3.
Ying Jin Dan Long Juan Li Ruichao Yu Yueming Song Jie Fang Xi Yang Shu Zhou Shishu Huang Zhihe Zhao 《Journal of cellular physiology》2019,234(9):14838-14851
Bone and tooth, fundamental parts of the craniofacial skeleton, are anatomically and developmentally interconnected structures. Notably, pathological processes in these tissues underwent together and progressed in multilevels. Extracellular vesicles (EVs) are cell-released small organelles and transfer proteins and genetic information into cells and tissues. Although EVs have been identified in bone and tooth, particularly EVs have been identified in the bone formation and resorption, the concrete roles of EVs in bone and tooth development and diseases remain elusive. As such, we review the recent progress of EVs in bone and tooth to highlight the novel findings of EVs in cellular communication, tissue homeostasis, and interventions. This will enhance our comprehension on the skeletal biology and shed new light on the modulation of skeletal disorders and the potential of genetic treatment. 相似文献
4.
《Molecular cell》2020,77(6):1265-1278.e7
- Download : Download high-res image (317KB)
- Download : Download full-size image
5.
6.
7.
《Developmental cell》2022,57(22):2533-2549.e7
- Download : Download high-res image (204KB)
- Download : Download full-size image
8.
Summary Chromatin fractions from Friend erythroleukemia cells after induction of differentiation by dimethylsulfoxide (DMSO) were compared in their biochemical characteristics to fractions from uninduced cells. Fractions were prepared by extracting chromatin from nuclei after mild micrococcal nuclease treatment with increasing concentrations of NaCl according to Sanders [1]. This procedure has been found to release chromatin containing hyperacetylated histones preferentially [2]. The fractions obtained by this procedure were analysed in respect to the amount of chromatin released, the amount of histone H1, the degree of acetylation of histone H4, the presence of non-histone proteins and the concentration of transcribed and non-transcribed sequences. It was found that the fractions differ in the amount of histone H1 present, in several non-histone proteins and in the acetylation of histonie H4, regardless whether induced or uninduced cells were analysed. The distribution of transcribed sequences versus non-transcribed sequences among the fractions was the same, demonstrating that this fractionation procedure, although leading to fractions with biochemical differences, is not able to discriminate functional states of chromatin and that the biochemical characteristics of the fractions may be common to both, active as well as inactive states of chromatin. 相似文献
9.
Kenneth A. Marx Ray Kruger Michael J. Clarke 《Molecular and cellular biochemistry》1989,86(2):155-162
The goal of this study is to establish the nature of pentammineruthenium(III) binding to DNA in intact mouse liver nuclei. Also, we wish to determine whether the nucleosomal organization of mouse chromatin has a substantial effect on the relative Ru(III) binding levels of internucleosomal and nucleosomal core DNA. These questions are important because ammineruthenium compounds share chemical and biological properties with the cis-dichlorodiammineplatinum(II) or cisplatin chemotherapeutic agent. Therefore, they represent a potential class of new chemotherapeutic agents. We find that in intact nuclei the predominant DNA binding site for pentammineruthenium(II), followed by air oxidation to pentammineruthenium(III), is N-7 guanine, as is the case with cisplatin. Also, the Ru(III) distribution between internucleosomal and nucleosomal core DNA was found to be nearly identical as probed with three non-specific deoxyribonucleases. 相似文献
10.