全文获取类型
收费全文 | 18517篇 |
免费 | 740篇 |
国内免费 | 77篇 |
专业分类
耳鼻咽喉 | 233篇 |
儿科学 | 307篇 |
妇产科学 | 197篇 |
基础医学 | 2287篇 |
口腔科学 | 574篇 |
临床医学 | 1127篇 |
内科学 | 4349篇 |
皮肤病学 | 224篇 |
神经病学 | 1497篇 |
特种医学 | 805篇 |
外科学 | 3235篇 |
综合类 | 68篇 |
预防医学 | 591篇 |
眼科学 | 273篇 |
药学 | 1212篇 |
中国医学 | 34篇 |
肿瘤学 | 2321篇 |
出版年
2023年 | 92篇 |
2022年 | 167篇 |
2021年 | 276篇 |
2020年 | 165篇 |
2019年 | 197篇 |
2018年 | 290篇 |
2017年 | 197篇 |
2016年 | 258篇 |
2015年 | 255篇 |
2014年 | 384篇 |
2013年 | 457篇 |
2012年 | 764篇 |
2011年 | 737篇 |
2010年 | 499篇 |
2009年 | 449篇 |
2008年 | 758篇 |
2007年 | 766篇 |
2006年 | 852篇 |
2005年 | 845篇 |
2004年 | 844篇 |
2003年 | 806篇 |
2002年 | 843篇 |
2001年 | 792篇 |
2000年 | 793篇 |
1999年 | 723篇 |
1998年 | 274篇 |
1997年 | 210篇 |
1996年 | 195篇 |
1995年 | 148篇 |
1994年 | 118篇 |
1993年 | 124篇 |
1992年 | 479篇 |
1991年 | 425篇 |
1990年 | 380篇 |
1989年 | 475篇 |
1988年 | 390篇 |
1987年 | 339篇 |
1986年 | 363篇 |
1985年 | 348篇 |
1984年 | 253篇 |
1983年 | 163篇 |
1982年 | 81篇 |
1979年 | 153篇 |
1978年 | 106篇 |
1977年 | 90篇 |
1975年 | 82篇 |
1974年 | 76篇 |
1973年 | 77篇 |
1969年 | 92篇 |
1967年 | 88篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
21.
HMG-CoA reductase inhibitor cerivastatin prolonged rat cardiac allograft survival by blocking intercellular signals. 总被引:11,自引:0,他引:11
Hitoshi Horimoto Yasunari Nakai Ken ich Nakahara Yukiya Nomura Shigetoshi Mieno Shinjiro Sasaki 《The Journal of heart and lung transplantation》2002,21(4):440-445
BACKGROUND: The development of atherosclerotic cardiovascular complications caused by hyperlipidemia is a common and serious problem for long-term survivors of organ transplantation. However, adhesion molecules such as intercellular adhesion molecule (ICAM)-1 and lymphocyte function-associated antigen (LFA)-1 are involved in allograft rejection, possibly by providing costimulatory signals. 3-Hydroxy-3-methylglutaryl coenzyme A (HMG-CoA) reductase inhibitor cerivastatin has been shown to suppress ICAM-1 expression in acute inflammatory responses. METHODS: In this study, we evaluated the immunosuppressive effects of cerivastatin in rat cardiac allografts. The hearts of Fischer rats were transplanted heterotopically into Lewis rats. Cerivastatin (2 mg/kg) was administrated intraperitoneally to recipients for 7 consecutive days from the day before transplantation. RESULTS: Graft survival in the cerivastatin-treated group (n = 8) was significantly longer than in controls (n = 10) (24.6 +/- 2.2 days vs 10.2 +/- 1.3 days, p < 0.05). Mixed lymphocyte reaction (MLR) showed that on Day 8 after grafting, the proliferative response of alloreactive T cells against F344 alloantigen in cerivastatin-treated rats was significantly more suppressed than in Lewis rats. The Interleukin-2 concentration of supernatant in MLR cultures in the cerivastatin-treated group was lower than in the control group. Immunohistochemical analysis showed that the percentage of CD4-positive cells to infiltrating mononuclear cells was less prominent in the cerivastatin-treated group (9.8% +/- 2.2%) than in the control group (20.9% +/- 3.2%). CONCLUSIONS: The HMG-CoA reductase inhibitor cerivastatin effectively suppressed acute graft rejection, possibly by blocking intercellular signals via ICAM/LFA-1, and cerivastatin may be a candidate for treating patients with hyperlipidemia who undergo organ transplantation. 相似文献
22.
23.
Effects of vancomycin and ofloxacin on rabbit ERG in vivo 总被引:1,自引:0,他引:1
The retinal toxicity of vancomycin and ofloxacin was studied by electroretinogram (ERG) before and after intravitreal injection in rabbits. Vancomycin is known to be effective on methicillin-resistant Staphylococcus aureus. A dose of 1mg vancomycin caused no ERG change for at least eight weeks after injection. The feature that ERG became non-recordable during one to four weeks after an intravitreal injection of 10mg vancomycin, with recovery of only the c-wave was conspicuous. A dose of 200 micrograms ofloxacin did not cause deterioration of the b-wave, the c-wave or the oscillatory potentials throughout the follow-up period up to eight weeks. Judging from the susceptibility of each ERG component to antimicrobials and taking into account the difference of vitreous volume between rabbits and humans, clinical doses of intravitreal single-shot injection should be less than 1mg for vancomycin and 200 micrograms for ofloxacin. 相似文献
24.
25.
26.
27.
The association of MTHFR and CBS variants with the doubling time and responsiveness to several chemodrugs was analyzed in 26 human cancer xenografts. The tumors homozygous for the absence of insertion (NN) for the CBS 844ins68bp were more chemosensitive than those with insertion (NI) to TS-1 (P=0.0048), suggesting a potential effect of this variant on fluoropyrimidine efficacy. Furthermore, the doubling time of tumors with a variant C allele (AC or CC) in MTHFR-A1298C was significantly longer than that of tumors with a normal allele (AA) (P=0.0008). Twenty-nine cellular proliferation-related genes were associated with MTHFR-A1298C genotyping and with the doubling time. 相似文献
28.
Kunihiro Ichinose Mitsuru Nakamura Kenji Takezawa Ichiro Masutomi Yoichi Shima Yoko Hirayama Kahoko Sorimachi Teruhiko Shimizu Hiroyo Ishikawa Namiko Kaji Sayaka Nakajima Michiko Wataru Shiho Nishigaki Hiroshi Suwa Yosuke Toyama Masaki Okumura Yoshikazu Ishitsuka Ken Shimizu Kazuya Kokubo Kenji Sasaki Shodai Saito 《Seishin shinkeigaku zasshi》2006,108(9):945-954
29.
Kenji Tsukada Shigeru Kobayashi Tatsuya Gotoh Naoki Asakage Masayuki Sekine Morio Sasaki Eiji Miyazaki Takahisa Suzuki Toshio Yamada Shu Hirai Shigetaka Yamazaki 《Digestive endoscopy》2006,18(1):55-58
A case of early gastric carcinoma accompanied by Dieulafoy ulcer is presented. The patient, a 26‐year‐old female, visited our emergency room with chief complaints of massive hematemesis and tarry stool. The initial endoscopic examination revealed a superficial depressed lesion with a faded color accompanied by a tiny ulcer with converging folds at the anterior wall of the middle gastric body. Although no active bleeding vessel was found at that time, the patient was admitted to our hospital for further check‐ups and treatment. On the 6th hospital day, she developed massive hematemesis resulting in shock. Urgent endoscopy, this time, disclosed an exposed bleeding vessel at the small ulcer floor previously mentioned, and endoscopic hemostasis was achieved. Since, however, a biopsy at initial examination from the surrounding depressed area proved carcinoma, a partial distal gastrectomy was subsequently carried out. Histological examination of the resected specimen confirmed the diagnosis of carcinoma limited to the mucosa and submucosa along with findings consistent with Dieulafoy ulcer. This is a rare case of combination of early cancer and Dieulafoy ulcer particularly in such a young patient. A review of the literature is also presented. 相似文献
30.
Hiromi Kataoka Takashi Joh Yusuke Inoue Naotaka Ogasawara Tadayuki Oshima Satoshi Tanida Makoto Sasaki Haruhisa Nakao Takahiro Nakazawa Hirotaka Ohara 《Digestive endoscopy》2006,18(4):294-297
A 75‐year‐old male was admitted to the gastroenterology unit of Nagoya City University Hospital due to epigastralgia after surgical treatment for right renal cancer. Endoscopy revealed advanced type 1 gastric cancer in the corpus of the stomach and multiple polypoid lesions in the stomach and duodenum. X‐ray examination of the small intestine using barium showed multiple polyps in the upper jejunum. Faint pigmentation on the palm was also detected. Peutz‐Jeghers syndrome (PJS) was diagnosed, despite a lack of family history. Total gastrectomy, resection of part of the upper jejunum and intraoperative endoscopic polypectomy of duodenal polyps was performed. This is the second reported case of PJS associated with renal cancer. We also detected a missense mutation in the tumor suppressor gene STK11 that, when mutated, is causative for PJS. 相似文献