全文获取类型
收费全文 | 341篇 |
免费 | 15篇 |
专业分类
356篇 |
出版年
2024年 | 3篇 |
2022年 | 4篇 |
2021年 | 4篇 |
2020年 | 5篇 |
2019年 | 1篇 |
2018年 | 6篇 |
2016年 | 6篇 |
2015年 | 9篇 |
2014年 | 21篇 |
2013年 | 21篇 |
2012年 | 20篇 |
2011年 | 26篇 |
2010年 | 12篇 |
2009年 | 27篇 |
2008年 | 26篇 |
2007年 | 25篇 |
2006年 | 21篇 |
2005年 | 20篇 |
2004年 | 19篇 |
2003年 | 15篇 |
2002年 | 14篇 |
2001年 | 3篇 |
2000年 | 3篇 |
1999年 | 1篇 |
1998年 | 5篇 |
1997年 | 3篇 |
1996年 | 3篇 |
1995年 | 1篇 |
1994年 | 1篇 |
1993年 | 3篇 |
1992年 | 6篇 |
1991年 | 5篇 |
1989年 | 2篇 |
1988年 | 3篇 |
1987年 | 2篇 |
1986年 | 3篇 |
1983年 | 2篇 |
1977年 | 2篇 |
1973年 | 1篇 |
1931年 | 2篇 |
排序方式: 共有356条查询结果,搜索用时 0 毫秒
51.
52.
Sato C Manaka S Nakane D Nishiyama H Suga M Nishizaka T Miyata M Maruyama Y 《Biochemical and biophysical research communications》2012,417(4):1213-1218
Mycoplasma is a genus of bacterial pathogen that causes disease in vertebrates. In humans, the species Mycoplasma pneumoniae causes 15% or more of community-acquired pneumonia. Because this bacterium is tiny, corresponding in size to a large virus, diagnosis using optical microscopy is not easy. In current methods, chest X-rays are usually the first action, followed by serology, PCR amplification, and/or culture, but all of these are particularly difficult at an early stage of the disease. Using Mycoplasma mobile as a model species, we directly observed mycoplasma in buffer with the newly developed Atmospheric Scanning Electron Microscope (ASEM). This microscope features an open sample dish with a pressure-resistant thin film window in its base, through which the SEM beam scans samples in solution, from below. Because of its 2-3μm-deep scanning capability, it can observe the whole internal structure of mycoplasma cells stained with metal solutions. Characteristic protein localizations were visualized using immuno-labeling. Cells were observed at low concentrations, because suspended cells concentrate in the observable zone by attaching to sialic acid on the silicon nitride (SiN) film surface within minutes. These results suggest the applicability of the ASEM for the study of mycoplasmas as well as for early-stage mycoplasma infection diagnosis. 相似文献
53.
Hiroki Nishimura Gen Komaki Tetsuya Ando Toshihiro Nakahara Takakazu Oka Keisuke Kawai Toshihiko Nagata Aya Nishizono Yuri Okamoto Kenjiro Okabe Masanori Koide Chikara Yamaguchi Satoshi Saito Kazuyoshi Ohkuma Katsutaro Nagata Tetsuro Naruo Masato Takii Nobuo Kiriike Toshio Ishikawa 《BioPsychoSocial medicine》2008,2(1):1-8
Background
Over the last five to ten years there has been an increase in psychosomatic complaints (PSC) in Swedish children. The objective of the study was to examine the relation between PSC and sense of coherence (SOC). 相似文献54.
Shimura H Fukagawa T Meguro A Yamada H Oh-Hira M Sano S Masuta C 《FEBS letters》2008,582(29):4047-4052
To find out whether we can control plant virus diseases by blocking viral RNA silencing suppressors (RSSs), we developed a strategy to screen inhibitors that block the association of RSSs with siRNAs using a surface plasmon resonance assay. The screened chemicals were tested in competition with RSSs for binding to siRNAs using a mobility shift assay. We then confirmed that tested chemicals actually inhibited the RSS activity in vivo using a protoplast assay which was developed for this purpose. This entire system can be adapted to screening inhibitors of not only plant viruses but also some animal viruses possessing RSSs. 相似文献
55.
Chikara Murakata Masami Kaneko George Gessner Thelma S Angeles Mark A Ator Teresa M O'Kane Beth Ann W McKenna Beth Ann Thomas Joanne R Mathiasen Michael S Saporito Donna Bozyczko-Coyne Robert L Hudkins 《Bioorganic & medicinal chemistry letters》2002,12(2):147-150
The MLK1-3 activity for a series of analogues of the indolocarbazole K-252a is reported. Addition of 3,9-bis-alkylthiomethyl groups to K-252a results in potent and selective MLK inhibitors. The in vitro and in vivo survival promoting activity of bis-isopropylthiomethyl-K-252a (16, CEP-11004/KT-8138) is reported. 相似文献
56.
Nobuya Katagiri Hideaki Kokufuda Masashi Makino Robert Vince Chikara Kaneko 《Nucleosides, nucleotides & nucleic acids》2013,32(1-3):81-89
Abstract The deamination of cyclaradine corresponding to a carbocyclic analogue of ara-A having anti-HSV activity by adenosine deaminase was examined under various pressure. The deamination of (+)- and (±)-cyclaradine was remarkably facilitated by high pressure, and the rate was increased with increasing of pressure. However, (-)-cyclaradine was not deaminated even under high pressure. 相似文献
57.
Eric S. Goetzman John F. Alcorn Sivakama S. Bharathi Radha Uppala Kevin J. McHugh Beata Kosmider Rimei Chen Yi Y. Zuo Megan E. Beck Richard W. McKinney Helen Skilling Kristen R. Suhrie Anuradha Karunanidhi Renita Yeasted Chikara Otsubo Bryon Ellis Yulia Y. Tyurina Valerian E. Kagan Rama K. Mallampalli Jerry Vockley 《The Journal of biological chemistry》2014,289(15):10668-10679
Long-chain acyl-CoA dehydrogenase (LCAD) is a mitochondrial fatty acid oxidation enzyme whose expression in humans is low or absent in organs known to utilize fatty acids for energy such as heart, muscle, and liver. This study demonstrates localization of LCAD to human alveolar type II pneumocytes, which synthesize and secrete pulmonary surfactant. The physiological role of LCAD and the fatty acid oxidation pathway in lung was subsequently studied using LCAD knock-out mice. Lung fatty acid oxidation was reduced in LCAD−/− mice. LCAD−/− mice demonstrated reduced pulmonary compliance, but histological examination of lung tissue revealed no obvious signs of inflammation or pathology. The changes in lung mechanics were found to be due to pulmonary surfactant dysfunction. Large aggregate surfactant isolated from LCAD−/− mouse lavage fluid had significantly reduced phospholipid content as well as alterations in the acyl chain composition of phosphatidylcholine and phosphatidylglycerol. LCAD−/− surfactant demonstrated functional abnormalities when subjected to dynamic compression-expansion cycling on a constrained drop surfactometer. Serum albumin, which has been shown to degrade and inactivate pulmonary surfactant, was significantly increased in LCAD−/− lavage fluid, suggesting increased epithelial permeability. Finally, we identified two cases of sudden unexplained infant death where no lung LCAD antigen was detectable. Both infants were homozygous for an amino acid changing polymorphism (K333Q). These findings for the first time identify the fatty acid oxidation pathway and LCAD in particular as factors contributing to the pathophysiology of pulmonary disease. 相似文献
58.
59.
60.
Obata M Hirohara S Sharyo K Alitomo H Kajiwara K Ogata S Tanihara M Ohtsuki C Yano S 《Biochimica et biophysica acta》2007,1770(8):1204-1211