全文获取类型
收费全文 | 4655篇 |
免费 | 270篇 |
国内免费 | 20篇 |
专业分类
耳鼻咽喉 | 36篇 |
儿科学 | 129篇 |
妇产科学 | 83篇 |
基础医学 | 693篇 |
口腔科学 | 148篇 |
临床医学 | 357篇 |
内科学 | 1168篇 |
皮肤病学 | 110篇 |
神经病学 | 380篇 |
特种医学 | 68篇 |
外科学 | 518篇 |
综合类 | 31篇 |
一般理论 | 1篇 |
预防医学 | 164篇 |
眼科学 | 207篇 |
药学 | 428篇 |
中国医学 | 35篇 |
肿瘤学 | 389篇 |
出版年
2023年 | 49篇 |
2022年 | 76篇 |
2021年 | 115篇 |
2020年 | 49篇 |
2019年 | 86篇 |
2018年 | 105篇 |
2017年 | 78篇 |
2016年 | 108篇 |
2015年 | 100篇 |
2014年 | 121篇 |
2013年 | 167篇 |
2012年 | 251篇 |
2011年 | 312篇 |
2010年 | 174篇 |
2009年 | 158篇 |
2008年 | 294篇 |
2007年 | 314篇 |
2006年 | 282篇 |
2005年 | 307篇 |
2004年 | 289篇 |
2003年 | 264篇 |
2002年 | 283篇 |
2001年 | 84篇 |
2000年 | 88篇 |
1999年 | 73篇 |
1998年 | 52篇 |
1997年 | 38篇 |
1996年 | 41篇 |
1995年 | 28篇 |
1994年 | 30篇 |
1993年 | 18篇 |
1992年 | 47篇 |
1991年 | 42篇 |
1990年 | 47篇 |
1989年 | 35篇 |
1988年 | 23篇 |
1987年 | 23篇 |
1986年 | 25篇 |
1985年 | 31篇 |
1984年 | 31篇 |
1983年 | 15篇 |
1982年 | 12篇 |
1981年 | 14篇 |
1980年 | 18篇 |
1979年 | 23篇 |
1978年 | 18篇 |
1974年 | 16篇 |
1972年 | 12篇 |
1971年 | 11篇 |
1970年 | 11篇 |
排序方式: 共有4945条查询结果,搜索用时 31 毫秒
31.
Kyoko Okimoto Takeo Juji Shuntaro Ishiba Hiroshi Maruyama Hiroshi Tohyama Kinori Kosaka 《Tissue antigens》1978,11(5):418-422
HLA—B8 and/or Bw15, associated with juvenile onset insulin-dependent diabetes mellitus (JDM) in Caucasians, have a very low frequency in the Japanese population. Thus, we were interested in investigating the association between JDM and HLA antigen in a Japanese population. Eighty-nine patients with JDM and 128 unrelated random controls were HLA-typed by the micro-lymphocytotoxicity test. The data revealed a significant, positive association between this type of diabetes mellitus and HLA-Bw54 (Bw22-J, J-1) antigen (Japanese-specific split antigen of HLA—Bw22). 相似文献
32.
Clinicopathological significant and prognostic influence of cadherin-17 expression in gastric cancer 总被引:5,自引:0,他引:5
Ito R Oue N Yoshida K Kunimitsu K Nakayama H Nakachi K Yasui W 《Virchows Archiv : an international journal of pathology》2005,447(4):717-722
Cadherin-17 (CDH17), also called liver–intestine cadherin, is a structurally unique member of the cadherin superfamily. Our
serial analysis of gene expression demonstrated that CDH17 was one of the most up-regulated genes in advanced gastric carcinomas.
CDH17 expression is known to be regulated by Cdx2. In the present study, we examined the expression of CDH17 in primary gastric
carcinoma tissues by immunohistochemistry, and analyzed the correlation of CDH17 expression with clinicopathological characteristics
and patients prognosis. CDH17 expression was detected in 63/94 (67%) of gastric adenocarcinomas in addition to intestinal
metaplasia. The expression of CDH17 tended to be associated with intestinal type carcinoma, and carcinomas with CDH17 expression
was significantly more frequent in advanced stage cases (80%) than in early stage (53%). The prognosis of patients with positive
CDH17 expression was significantly poorer than that of the negative cases (P=0.0314). However, multivariate analysis revealed that CDH17 was not an independent prognostic factor. Six of seven cases
that showed positive expression of Cdx2 simultaneously expressed CDH17 protein. These results suggested that the expression
of CDH17 was characteristic of the advanced gastric carcinoma that is associated with poor prognosis. 相似文献
33.
Amagai T Mouri T Kirii K Hori T Kaneko M Ohkawa H 《Clinical and experimental pharmacology & physiology. Supplement》2002,(29):S19-S22
1. Biliary atresia (BA), as a common disease in Japan, and cystic fibrosis (CF), as an extremely uncommon disease in Japan, were selected to assess the clinical significance of measurement of energy expenditure (EE). 2. Energy expenditure was significantly higher in children with BA than in normal children. 3. Measurement of EE in BA lead to clues to resolving its mechanism by novel assessment of interleukin-6 and leptin. 4. Energy expenditure in children with CF is also higher, but this has been addressed by nutritional intervention with additional calories. 5. Individualization of EE measurement is necessary in the analysis of pathological mechanisms and nutritional management of patients with both common and uncommon diseases. 相似文献
34.
Okano A Nakano S Namura K Yamada N Uchida R Fuchida S Okamoto M Ochiai N Shimazaki C 《Cancer Genetics and Cytogenetics》2005,159(2):174-176
A 43-year-old woman was diagnosed as having stage IV follicular lymphoma. Phenotypically, the lymphoma cells were CD5(-), CD10(+), CD19(+), CD20(+), CD23(-), HLA-DR(+), and IgM-lambda(+). Conventional chromosomal analysis showed a three-way t(3;14;18)(q27;q32;q21) in the lymphoma cells, which was confirmed by spectral karyotyping (SKY) and fluorescence in situ hybridization (FISH). Immunohistochemistry revealed that both BCL2 and BCL6 proteins were expressed in the lymphoma cells, whereas only the BCL6 gene, and not the BCL2 gene, was rearranged by Southern blotting. The patient received combination chemotherapy and has been well for 3 years. This is the first reported case showing a three-way translocation involving 2 major lymphoma-specific abnormalities, 3q27 and t(14;18)(q32;q21). 相似文献
35.
Intracerebroventricular administration of NPY stimulates resistin gene expression in mice 总被引:5,自引:0,他引:5
Yuzuriha H Inui A Goto K Asakawa A Fujimiya M Kasuga M 《International journal of molecular medicine》2003,11(5):675-676
Resistin is thought to cause insulin resistance and link obesity to type 2 diabetes mellitus. However, little is known about the effects of neuropeptide Y (NPY) on resistin gene expression in white adipose tissue (WAT). Resistin gene expression was determined by northern blot analysis in food-deprived mice after NPY administration. Administered NPY (1 nmol/mouse) significantly increased resistin mRNA expression in WAT by 72% compared with artificial cerebrospinal fluid treated controls. These observations indicate that NPY might have a role in regulating resistin gene expression in WAT and that the novel brain-fat axis might be involved in the pathogenesis of obesity and related diseases. 相似文献
36.
Yoko Mamada Takahiro Murata Ayumi Taniguchi Yuki Hasegawa Tetsuomi Suzuki Kyoko Kohda Kiyoto Nasuno Toshiaki Watanabe Seiji Yamaguchi Akira Ishiguro 《Arerugī》2008,57(5):552-557
We reported a 4-month-old girl with biotin deficiency caused by amino acid formula. Two weeks after birth, she was diagnosed as having a milk protein allergy. After switching to amino acid formula from usual formula, her symptoms and laboratory findings became normal. About three weeks after the beginning of amino acid formula, she developed intractable skin erosions around the eyes, mouth, neck, and anogenital area. By measuring concentrations of some trace elements, she was diagnosed as having a biotin deficit, because of the organic aciduria and undetectable serum biotin concentration. Her serum biotinidase level was normal. Upon administration of oral biotin supplementation, all her symptoms and laboratory findings were dramatically improved. Since amino acid formula contains very few biotin, we should pay attention to biotin deficiency when infants receiving amino acid formula. 相似文献
37.
38.
Nidhi Sharma Atsushi Ohyabu Yoshiki Murakumo Masahide Takahashl Mitsuhiro Saito Hiroyuki Amo Shin-ichiro Murayama Kyoko Ohno Sen-ichi Oda Mutsushi Matsuyama 《Pathology international》1997,47(7):436-441
The thymoma prone BUF/Mna (B) rat is a useful model for Studying the genes responsible for thymus enlargement during the stage of young growth. Among the strains of rats, B rats have the largest thymuses at al stages of life. A locus, Ten-1 , which contributes to thymus enlargement in back-cross (BC) rats between the B and WKY/NCrj (W) strains, was mapped on chromosome 1. To determine the precise location of the bus, (B×(B×MITE)F1) BC rats were generated by crossing the B strain with the Inbred MITE (M) strain, which was established from captured, Japanese wild rats, and were examined by linkage study using polymerase chain reaction with 67 microsatellite markers. Linkages with thymus enlargements were found In genotypes of seven markers, BSIS, LSN, MYL2, IGF2, PBPC2, D1Mgh11 , and D1Mit6 , by X2- test and Student's t -test, which confirmed the presence of the genetic locus associated with thymus enlargement, Ten-1 , in this region. Paradoxically, a suppressive locus, Tsu-1 , to thymus enlargement was also found on chromosome 3, showing linkages of phenotype of the small thymus with genotypes of SCN2A, CAT D3Mit16 , and D3Mit13 . By analyses of mapmaker/exp and mapmaker/qtl, Ten-1 was mapped at 4.6 cM proximal from IGF2 locus on chromosome 1 and Tsu-1 at 4.0 cM proximal from CAT locus on chromosome 3, respectively. 相似文献
39.
We previously reported that ammonia induced apoptosis in cultured rat hippocampal neurons with moderate increases in the intracellular calcium concentration and decreases in phospho-BAD levels. Since this suggested the involvement of calcineurin in the apoptosis, the effects of calcineurin inhibitors, 1 microM cyclosporin A and 1 microM FK506, on the ammonia-induced neuronal apoptosis were tested. Both of the inhibitors abolished the neuronal apoptosis assessed by double staining with Hoechst 33258 and anti-neurofilament antibody, and the ammonia-induced decrease in phospho-BAD Ser(155) level. Thus, calcineurin appeared to be involved in the dephosphorylation of BAD at the sites including Ser(155) in ammonia-induced apoptosis. 相似文献
40.
Toshikazu Kubo Tetsushi Minamitani Hiroyasu Nishikawa Yasusuke Hirasawa 《Pathophysiology》1998,4(4):303-308
Energy metabolism and contractility of rat’s femoral triceps muscles were investigated by varying blood flow levels with ligation of the femoral artery. The triceps were stimulated electrically to produce equivalent conditions as exercise loading, and phosphorus nuclear magnetic resonance (31P-NMR) spectra and muscle tension levels were monitored. The ratio of inorganic phosphate (Pi) to ‘Pi+phosphocreatine (PCr)’, i.e. Pi/(Pi+PCr), was obtained from 31P-NMR spectra. This ratio was related to the reduction of blood flow ratio (BFR) during and after the stimulation period, whereas before starting the stimulation, there was no significant correlation. These findings indicate: (i) muscle energy metabolism during decreased blood flow is influenced by the stimulation (loading) given to the muscle; and (ii) changes of muscle energy metabolism due to decreased muscle blood flow during the loading is evaluable by measuring 31P-NMR spectra. Muscle tension reached the plateau 8 min after starting the stimulation, regardless of BFR, but muscle tension ratio decreased as BFR became lower. This indicates that decreased blood flow diminishes muscle contractility, and then lowers muscle function levels. Our findings indicate that muscle blood flow plays an important role in muscle function, and blood flow and muscle function levels are evaluable by measuring 31P-NMR spectra of the muscle. 相似文献