全文获取类型
收费全文 | 2580篇 |
免费 | 119篇 |
国内免费 | 13篇 |
专业分类
耳鼻咽喉 | 14篇 |
儿科学 | 56篇 |
妇产科学 | 12篇 |
基础医学 | 329篇 |
口腔科学 | 96篇 |
临床医学 | 108篇 |
内科学 | 443篇 |
皮肤病学 | 28篇 |
神经病学 | 223篇 |
特种医学 | 91篇 |
外科学 | 618篇 |
综合类 | 18篇 |
预防医学 | 56篇 |
眼科学 | 30篇 |
药学 | 200篇 |
中国医学 | 8篇 |
肿瘤学 | 382篇 |
出版年
2023年 | 8篇 |
2022年 | 37篇 |
2021年 | 53篇 |
2020年 | 31篇 |
2019年 | 26篇 |
2018年 | 49篇 |
2017年 | 25篇 |
2016年 | 32篇 |
2015年 | 43篇 |
2014年 | 47篇 |
2013年 | 56篇 |
2012年 | 130篇 |
2011年 | 133篇 |
2010年 | 65篇 |
2009年 | 81篇 |
2008年 | 98篇 |
2007年 | 119篇 |
2006年 | 120篇 |
2005年 | 132篇 |
2004年 | 104篇 |
2003年 | 95篇 |
2002年 | 113篇 |
2001年 | 99篇 |
2000年 | 91篇 |
1999年 | 103篇 |
1998年 | 37篇 |
1997年 | 36篇 |
1996年 | 25篇 |
1995年 | 12篇 |
1994年 | 21篇 |
1993年 | 14篇 |
1992年 | 58篇 |
1991年 | 74篇 |
1990年 | 61篇 |
1989年 | 78篇 |
1988年 | 69篇 |
1987年 | 42篇 |
1986年 | 39篇 |
1985年 | 39篇 |
1984年 | 26篇 |
1983年 | 25篇 |
1982年 | 15篇 |
1981年 | 7篇 |
1980年 | 13篇 |
1979年 | 28篇 |
1978年 | 17篇 |
1977年 | 15篇 |
1974年 | 9篇 |
1972年 | 10篇 |
1971年 | 8篇 |
排序方式: 共有2712条查询结果,搜索用时 281 毫秒
81.
Kuwada Kohei Kawase Satoshi Nakata Karin Shinya Nodoka Narukawa Yuji Fuchino Hiroyuki Kawahara Nobuo Kiuchi Fumiyuki 《Journal of natural medicines》2020,74(1):135-141
Journal of Natural Medicines - LC–MS analyses of saponin fractions of Achyranthes roots in the Japanese market revealed that there were three patterns for the saponin fraction of their water... 相似文献
82.
Batsukh Zolboo Toume Kazufumi Javzan Batkhuu Kazuma Kohei Cai Shao-Qing Hayashi Shigeki Kawahara Nobuo Maruyama Takuro Komatsu Katsuko 《Journal of natural medicines》2020,74(1):170-188
Journal of Natural Medicines - Saposhnikoviae Radix (SR) is a commonly used crude drug that is obtained from the root and rhizome of Saposhnikovia divaricata which is distributed throughout China,... 相似文献
83.
84.
85.
OBJECTIVE: To assess changes in response to nasal continuous positive airway pressure (CPAP) in patients with obstructive sleep apnea syndrome (OSAS) concerning excessive daytime sleepiness (EDS), depressive state, and quality of life (QOL). PATIENTS AND METHODS: We assessed for EDS using the Epworth sleepiness scale (ESS), for mood using The Zung self-depression scale (SDS), and for QOL using Short-Form 36 (SF-36) in 132 patients with obstructive sleep apnea syndrome (OSAS) and control subjects. Patients had severe OSAS (apnea-hypopnea index, 59.4+/-23.8/h) and were more hypersomnolent and depressed, and had poorer QOL than 38 age- and gender-matched controls. RESULTS: Before treatment most QOL domains in the SF-36 were significantly associated with patients' SDS scores. With nasal CPAP, ESS and SDS scores were respectively decreased from 9.7+/-4.5 to 4.0+/-2.4 (p<0.0001) and from 49.2+/-10.4 to 45.1+/-9.6 (p<0.0005). Total SF-36 score and scores for seven of eight domains were increased significantly with treatment. Thus, nasal CPAP lessens EDS and depression, and improves QOL, in patients with severe OSAS. Further, magnitudes of changes in total SF-36 scores and in five of eight domains correlated significantly with magnitude of change in SDS score upon nasal CPAP treatment. No relationship was evident between treatment-associated score changes in SF-36 domains and ESS score change. CONCLUSION: Although patients with severe OSAS have poorer QOL than control subjects, nasal CPAP appears to improve QOL by alleviating depression. 相似文献
86.
87.
Development and internal validation of a nomogram for predicting stone‐free status after flexible ureteroscopy for renal stones
下载免费PDF全文
![点击此处可从《BJU international》网站下载免费的PDF全文](/ch/ext_images/free.gif)
88.
Hayashi T Kawahara H Kobayashi S Kashiwagi H Hirai K Yanaga K 《Hepato-gastroenterology》2008,55(82-83):403-406
BACKGROUND/AIMS: We evaluated a relationship between postoperative recurrence and thymidine phosphorylase (TP), dihydropyrimidine dehydrogenase (DPD) and thymidylate synthase (TS) expression at the invasive front of T3 rectal cancer. METHODOLOGY: This study was conducted on 61 patients with T3 rectal cancer who underwent surgically curative resection between 1998 and 2002. Paraffin-embedded sections of these patients were immunostained for TP, DPD and TS. Relationship between expression level of the three factors and postoperative recurrence were evaluated. RESULTS: There was no relationship between expression of DPD or TS in the tumor cells and recurrences. Although no relationship was present between expression of TP in the stromal cells around the invasive front of the tumor and postoperative recurrences, there was a strong correlation between expression of TP in the invasive front of the tumor and postoperative recurrence. Moreover, by multivariate logistic regression analysis, TP expression in the tumor cells was the only independent contributory factor for postoperative recurrences (p = 0.021) with an odds ratio of 8.27. CONCLUSIONS: TP expression at the invasive front of the tumor may be an important prognostic factor for T3 rectal cancer, and patients with such a condition may benefit from intensive chemotherapy. 相似文献
89.
H Okada M Takemoto Y Kawahara J Nasu R Takenaka S Kawano M Inoue K Ichimura T Tanaka K Shinagawa T Yoshino K Yamamoto 《Digestion》2012,86(3):179-186
Background/Aims: Few studies exist on the efficacy and long-term outcome of radiation therapy (RT) for gastric mucosa-associated lymphoid tissue (MALT) lymphoma. Methods: Twenty-two patients with stage I or stage II(1) disease were prospectively evaluated, including 14 patients without Helicobacter pylori(H. pylori) infection and 8 patients with persistent lymphoma after H. pylori eradication. RT dose was 30 Gy in daily fractions of 1.5 Gy. All patients underwent endoscopic and histological follow-up regularly. Results: The study included 22 patients with a mean age of 63 years. The t(11;18)(q21;q21) translocation occurred in 8 of the 22 cases. All patients showed complete remission without any serious toxicity. At a median follow-up evaluation 74 months (range 27-159) after completion of RT, the overall and relapse-free survival rates after 5 years were 91 and 84%, respectively. Although no patient showed local recurrence of lymphoma, distant recurrence was detected in 3 patients, all of whom were H. pylori negative; MALT lymphoma relapsed in two patients with the t(11;18)(q21;q21) translocation, and diffuse large-cell lymphoma developed in one patient without the translocation. Conclusion: RT provides excellent local control of the gastric MALT lymphoma. However, continuous follow-up is mandatory as relapse may occur in other sites. 相似文献
90.
Chiaki Iwamura Kenta Shinoda Yusuke Endo Yukiko Watanabe Damon John Tumes Shinichiro Motohashi Kazuyoshi Kawahara Yuki Kinjo Toshinori Nakayama 《Proceedings of the National Academy of Sciences of the United States of America》2012,109(42):16992-16997
To develop more effective vaccines and strategies to regulate chronic inflammatory diseases, it is important to understand the mechanisms of immunological memory. Factors regulating memory CD4+ T helper (Th)-cell pool size and function remain unclear, however. We show that activation of type I invariant natural killer T (iNKT) cells with glycolipid ligands and activation of type II natural killer T (NKT) cells with the endogenous ligand sulfatide induced dramatic proliferation and expansion of memory, but not naïve, CD4 T cells. NKT cell-induced proliferation of memory Th1 and Th2 cells was dependent largely on the production of IL-2, with Th2-cell proliferation also affected by loss of IL-4. Type II NKT cells were also required for efficient maintenance of memory CD4 T cells in vivo. Activation of iNKT cells resulted in up-regulation of IFN-γ expression by memory Th2 cells. These IFN-γ–producing memory Th2 cells showed a decreased capability to induce Th2 cytokines and eosinophilic airway inflammation. Thus, activated NKT cells directly regulate memory CD4 T-cell pool size and function via the production of cytokines in vivo. 相似文献