全文获取类型
收费全文 | 18500篇 |
免费 | 918篇 |
国内免费 | 140篇 |
专业分类
耳鼻咽喉 | 167篇 |
儿科学 | 376篇 |
妇产科学 | 142篇 |
基础医学 | 2493篇 |
口腔科学 | 382篇 |
临床医学 | 1205篇 |
内科学 | 4816篇 |
皮肤病学 | 349篇 |
神经病学 | 1683篇 |
特种医学 | 695篇 |
外科学 | 3028篇 |
综合类 | 83篇 |
预防医学 | 508篇 |
眼科学 | 410篇 |
药学 | 1177篇 |
中国医学 | 43篇 |
肿瘤学 | 2001篇 |
出版年
2024年 | 12篇 |
2023年 | 128篇 |
2022年 | 234篇 |
2021年 | 424篇 |
2020年 | 217篇 |
2019年 | 337篇 |
2018年 | 433篇 |
2017年 | 351篇 |
2016年 | 441篇 |
2015年 | 453篇 |
2014年 | 571篇 |
2013年 | 701篇 |
2012年 | 1181篇 |
2011年 | 1330篇 |
2010年 | 712篇 |
2009年 | 598篇 |
2008年 | 1163篇 |
2007年 | 1307篇 |
2006年 | 1221篇 |
2005年 | 1337篇 |
2004年 | 1288篇 |
2003年 | 1273篇 |
2002年 | 1187篇 |
2001年 | 198篇 |
2000年 | 153篇 |
1999年 | 217篇 |
1998年 | 275篇 |
1997年 | 211篇 |
1996年 | 181篇 |
1995年 | 185篇 |
1994年 | 141篇 |
1993年 | 134篇 |
1992年 | 101篇 |
1991年 | 99篇 |
1990年 | 82篇 |
1989年 | 88篇 |
1988年 | 73篇 |
1987年 | 61篇 |
1986年 | 54篇 |
1985年 | 41篇 |
1984年 | 47篇 |
1983年 | 38篇 |
1982年 | 35篇 |
1981年 | 40篇 |
1980年 | 37篇 |
1979年 | 24篇 |
1978年 | 24篇 |
1977年 | 12篇 |
1976年 | 17篇 |
1975年 | 17篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
81.
82.
The infeasibility of using ten-ring irradiated grafts for tracheal allotransplantation even with omentopexy 总被引:2,自引:0,他引:2
In our previous study, we demonstrated that high-dose 60Co irradiation was able to prevent rejection of canine tracheal allografts. To determine the maximum possible length of these grafts, in the present study we attempted to transplant five-ring and ten-ring tracheal allografts in two groups of five dogs each. Either five or ten rings were excised from donor tracheas and irradiated with 100,000 cGy of 60Co. The irradiated tracheal grafts were transplanted to replace either five- or ten-ring sections of the mediastinal tracheas removed from the recipient dogs. The grafts were covered with omental pedicles and no immunosuppressants were used. Graft incorporation was achieved in four of the five dogs in the five-ring group, and three of these dogs survived for more than 700 days. However, four of the five animals in the ten-ring group died from tracheostenosis accompanied by ischemia within 3 weeks. These findings demonstrate the impossibility of performing ten-ring tracheal allotransplantation using irradiated grafts, even with omentopexy. 相似文献
83.
84.
Yuichi Ando Kenji Kikuchi Naoya Ichikawa Kazuhiko Meigata Yuji Nomura Kenshi Watanabe Yoshifumi Beck Hisakazu Degawa Shinji Tomikawa Takeshi Nagao Hisanori Chida 《Surgery today》1997,27(4):353-356
We herein report the case of a 53-year-old man with a nonspecific acute colonic ulcer whose liver function deteriorated after he had undergone hepatectomy. He was referred to our hospital for a hepatoma caused by hepatitis B virus and a right hemihepatectomy was performed. His liver function was poor after the operation, and minor complications such as pleural effusion and biliary fistula developed. A large amount of melena was seen 29 days after the hepatectomy and he developed hemorrhagic shock. Superior mesenteric arteriography revealed pooling of blood in both the hepatic flexure of the ascending colon and the cecum. An emergency right hemicolectomy was performed. There was a 5 x 1-mm ulcer 18 cm distal to the ileocecal valve. Numerous erosions were observed to be scattered throughout the colonic mucosa. The patient recovered slowly and was discharged 6 months after the hepatectomy. This is the first report of an acute colonic ulcer that could have been caused by liver dysfunction. 相似文献
85.
Kenji Wakabayashi Kazuo Kawasaki Daizo Yonemura Kiyohiko Yamazaki 《Documenta ophthalmologica. Advances in ophthalmology》1986,63(4):383-388
We previously reported the hyperosmolarity response (a decrease of the ocular standing potential by hyperosmolarity) as a new clinical test of the retinal pigment epithelium (RPE) activity. In the present study a hypertonic solution (Fructmanit, 1.4 × 103 m0sm/1) was intravenously injected for 20 min in proportion to a subject's total blood volume (TBV). At the injection speed of 5, 10, and 15% of the subjects' TBV per hour the mean amplitude of the hyperosmolarity response in normal subjects was 19.7, 30.1 and 36.4% respectively. The amplitude of the hyperosmolarity response depends on the logarithm of the dose of the hypertonic solution within the range of the dose tested.We previously found that hyperosmolarity suppresses the light rise. The present study investigated this suppressive effect in a quantitative manner. The light rise (a full-field illumination of 1.2 × 103 cdl/m2) was dose-dependently suppressed by Fructmanit. The mean of the light rise to dark trough ratio in normal subjects was 1.81 with no osmotic stress, and 1.64, 1.41 and 1.29 respectively at the injection speeds of 5, 10, and 15%. The suppression of the light rise by hyperosmolarity is compatible with the view that the hyperosmolarity response and the light rise share the basal membrane of the RPE as the main site of their generation. 相似文献
86.
Haruo Ito Zengo Kataumi Shigeyuki Yanagi Kenji Kawamura Hidenori Sumiya Hideki Fuse Jun Shimazaki 《International journal of andrology》1986,9(3):161-169
Testicular development was studied in prepubertal boys with retractile testes. Testicular volume, the diameter of the seminiferous tubules and the number of spermatogonia in the tubules were decreased in cases of unilateral retractile testis, when compared with values for the contralateral normally descended testis. On the other hand, in patients with a unilateral retractile testis and contralateral inguinal testis, there was no difference in the developmental parameters between the two testes. These results suggest that the retractile testis has developmental failures characteristic of a cryptorchid testis and therefore requires orchiopexy. 相似文献
87.
Jin Takemura Satoru Saeki Kenji Hachisuka Keinosuke Aritome 《Journal of rehabilitation medicine》2004,36(1):1-3
OBJECTIVES: To determine the number of polio survivors living in Kitakyushu, Japan, and the prevalence of post-polio syndrome. DESIGN: Cross-sectional survey in Kitakyushu. SUBJECTS/PATIENTS: A total of 342 possible polio survivors were selected from the list of physically disabled persons' certificates administered by the Department of Health and Welfare, Kitakyushu City Government. METHODS: A self-administered questionnaire concerning the diagnosis, paralysis, limitation in daily living, and use of adaptive devices was mailed to the 342 possible polio survivors. RESULTS: By confirmation of the diagnosis, 241 of the 342 turned out to be polio survivors, and the number of polio survivors per population of 100,000 amounted to 24.1. Of the polio survivors, 85% complained of new health problems such as difficulty in climbing stairs, muscle weakness, difficulty in walking, or fatigue. According to Halstead's criteria, 180 polio survivors suffered from post-polio syndrome, and the prevalence of post-polio syndrome in Kitakyushu was 18.0 per population of 100,000. CONCLUSIONS: This survey revealed the number of polio survivors, and the prevalence of post-polio syndrome in Kitakyushu, Japan. 相似文献
88.
Kenji Takahashi Toshikazu Kubo Kappei Kobayashi Jiro Imanishi Masaharu Tkigawa Yuji Arai Yasusuke Hirasawa 《Journal of orthopaedic research》1997,15(1):150-158
The present study investigated the influence of hydrostatic prssure on the exprssion of cytokines and heat shock protein 70 in a chondrocyte-like cell line. Chondrocyte-like cells (HCS-2/8) were exposed to hydrostatic pressur by a special pressure apparatus. Total RNA for cytokines (interleukin-1β, basic fibroblast growth factor, insulin-like growth factor-I, and transforming growth factor-β1) and for heat shock protein 70 was extracted and was analyzed by a polymerase chain reaction method and Northern blotting. An assay for incorporation of [35S]sulfate was performed to assess proteoglycan synthesis. The expression of transforming growth factor-β1 mRNA was enhanced after exposure to 5 Mpa of hydrostatic prssure and was reduced after 50 Mpa, whereas the expression of heat shock protein 70 was enhanced following exposure to 50 Mpa of hydrostatic pressure. The incorporation of [35S]sulfate into the cultured cells increased following exposure to 1-5 Mpa of hydrostatic pressure and decreased following 10-50 Mpa of pressure. These results suggest that hydrostatic pressure at physiologic levels enhances the expression of transforkming growth factor-β mRNA in addition to increasing proteoglycan synthesis in chondrocytes and that excessively high hydrostatic pressure reduces the expression of transforming growth factor-β1 mRNA and increases the expression of heat shock protein 79 mRNA while decreasing proteoglycan synthesis. 相似文献
89.
90.