全文获取类型
收费全文 | 18745篇 |
免费 | 6157篇 |
国内免费 | 84篇 |
专业分类
耳鼻咽喉 | 347篇 |
儿科学 | 469篇 |
妇产科学 | 468篇 |
基础医学 | 431篇 |
口腔科学 | 1412篇 |
临床医学 | 6275篇 |
内科学 | 4316篇 |
皮肤病学 | 584篇 |
神经病学 | 2280篇 |
特种医学 | 596篇 |
外科学 | 2680篇 |
综合类 | 66篇 |
现状与发展 | 2篇 |
一般理论 | 7篇 |
预防医学 | 2744篇 |
眼科学 | 429篇 |
药学 | 425篇 |
中国医学 | 26篇 |
肿瘤学 | 1429篇 |
出版年
2024年 | 226篇 |
2023年 | 1313篇 |
2022年 | 397篇 |
2021年 | 739篇 |
2020年 | 1180篇 |
2019年 | 555篇 |
2018年 | 1576篇 |
2017年 | 1706篇 |
2016年 | 1696篇 |
2015年 | 1717篇 |
2014年 | 1981篇 |
2013年 | 1983篇 |
2012年 | 832篇 |
2011年 | 865篇 |
2010年 | 1178篇 |
2009年 | 1537篇 |
2008年 | 641篇 |
2007年 | 441篇 |
2006年 | 538篇 |
2005年 | 328篇 |
2004年 | 257篇 |
2003年 | 234篇 |
2002年 | 177篇 |
2001年 | 290篇 |
2000年 | 138篇 |
1999年 | 233篇 |
1998年 | 284篇 |
1997年 | 300篇 |
1996年 | 296篇 |
1995年 | 253篇 |
1994年 | 161篇 |
1993年 | 146篇 |
1992年 | 113篇 |
1991年 | 89篇 |
1990年 | 68篇 |
1989年 | 91篇 |
1988年 | 68篇 |
1987年 | 54篇 |
1986年 | 44篇 |
1985年 | 48篇 |
1984年 | 34篇 |
1983年 | 23篇 |
1982年 | 22篇 |
1981年 | 19篇 |
1980年 | 17篇 |
1979年 | 11篇 |
1978年 | 15篇 |
1977年 | 10篇 |
1975年 | 12篇 |
1971年 | 11篇 |
排序方式: 共有10000条查询结果,搜索用时 23 毫秒
91.
Sabina Rak MD PhD Anette Bjrnson MSc Lena Hkanson MSc PhD Sverre Srenson MD PhD Per Venge MD PhD 《The Journal of allergy and clinical immunology》1991,88(6):878-888
Two groups of birch pollen--allergic patients with seasonal rhinoconjunctivitis and asthma were followed during two consecutive birch-pollen seasons, one group, N = 10, during a season with high pollen load, and one group, N = 15, during a season of low pollen load. Half the patients were treated with immunotherapy (IT) for 3 and 4 years, respectively. The other half of the patients served as control group (non-IT). Bronchoalveolar lavage (BAL) was performed once before each season and once during the pollen season. Eosinophil (EOS) numbers in BAL were increased (p less than 0.01) during the season with high pollen load but not in the season with a low pollen load, and this increment was absent in the IT-treated group. Also, the EOS cationic protein levels were raised in the non-IT-treated group during the season with a high pollen load. The levels of EOS and neutrophil chemotactic activity were raised in BAL in both seasons in the non-IT-treated group compared with the IT-treated group (p less than 0.02, p less than 0.003, p less than 0.04, and p less than 0.005 in high- and low-load pollen season, respectively). Serum and BAL eosinophil chemotactic activity (ECA) were positively correlated (p less than 0.001). We conclude that there is an influx of active EOSs into the lung of pollen-allergic patients with asthma during a pollen season, which may be abrogated by IT. Furthermore, the generation of ECA appears to be an extremely sensitive marker of antigenic exposure, and the potent inhibition of the generation of ECA by IT may provide a clue as to the mechanism of this treatment. 相似文献
92.
Kris Deering DipHe RMN BSc MH Inpatient Care MSc P.G. Ed PhD student. Jo Williams BSc RMN MSc PhD. Kay Stayner BSc RMN. Chris Pawson BSc PGCHE PhD. 《Nursing philosophy》2021,22(1):e12329
As a philosophical position, pragmatism can be critiqued to distinguish truth only with methods that bring about desired results, predominantly with scientific enquiry. The article hopes to dismiss this oversimplification and propose that within mental health nursing, enquiry enlightened by pragmatism can be anchored to methods helping to tackle genuine human problems. Whilst pragmatists suggest one reality exists, fluctuating experiences and shifting beliefs about the world can inhabit within; hence, pragmatists propose reality has the potential to change. Moreover, pragmatism includes being cognisant of what works to whom reality concerns, making reality context-driven, with a view to understand how actions shape experiences so what is generated has usefulness. Hence, it somewhat follows pragmatism can inform mental health nursing, after all, nursing is a discipline of action, and awareness is needed in how actions produce experiences that patients find helpful. Given the principles of recovery are preferably adopted in mental health care, the paper will explore how pragmatism can help nurses move towards that goal; specifically, with patients voicing their experiences. This is because like pragmatism, recovery subscribes to hope that reality can progress, and through meaningful experiences and beliefs, patients have expertise about personal difficulties alongside how life may flourish, despite mental illness. 相似文献
93.
Ali Mousavi Ahmad Gharzi Mohammadreza Gholami Fatemeh Beyranvand Mohsen Takesh 《Andrologia》2021,53(11):e14231
Testicular torsion is a dangerous urogenital disorder which is caused by twisting of spermatic cord, and unless immediate treatments happen at a proper time, oxidative stress, occurred during ischaemia reperfusion, finally leads to irreversible disintegration of testicular tissue. One of the first preventive lines is to administrate antioxidant factors. In the present study, we investigate the therapeutic effect of cerium oxide nanoparticle on the injury. We divided 45 rats into nine groups, subjected eight groups to testicular torsion–detorsion, injected different doses of cerium oxide nanoparticle into the peritoneum of six groups and analysed all the groups regarding spermatogenetic indices including sperm count, sperm viability and Johnson mean. Our results showed that cerium oxide nanoparticle can alleviate oxidative stress in testis, and this alleviation promotes the reproductive indices as the concentration of cerium oxide nanoparticles increases. The catalase-mimetic and superoxide dismutase-mimetic activities of cerium oxide nanoparticle are the most probable theories to explain the antioxidant effect of the nanoparticle. 相似文献
94.
95.
Gerson M. Struik MSc MD PhD Bram Schermers MSc Ingeborg Mares MSc MD PhD Harold E. Lont MSc MD Jennifer W. Bradshaw MSc MD Bernard ten Haken MSc Ir PhD Theo J. M. Ruers MSc MD PhD Jurgen E. M. Mourik PhD Erwin Birnie MSc PhD Taco M. A. L. Klem MSc MD PhD 《The breast journal》2021,27(8):638-650
Wire-guided localization (WGL) is the standard of care in the surgical treatment of nonpalpable breast tumors. In this study, we compare the use of a new magnetic marker localization (MaMaLoc) technique to WGL in the treatment of early-stage breast cancer patients. Open-label, single-center, randomized controlled trial comparing MaMaLoc (intervention) to WGL (control) in women with early-stage breast cancer. Primary outcome was surgical usability measured using the System Usability Scale (SUS, 0–100 score). Secondary outcomes were patient reported, clinical, and pathological outcomes such as retrieval rate, operative time, resected specimen weight, margin status, and reoperation rate. Thirty-two patients were analyzed in the MaMaLoc group and 35 in the WGL group. Patient and tumor characteristics were comparable between groups. No in situ complications occurred. Retrieval rate was 100% in both groups. Surgical usability was higher for MaMaLoc: 70.2 ± 8.9 vs. 58.1 ± 9.1, p < 0.001. Patients reported higher overall satisfaction with MaMaLoc (median score 5/5) versus WGL (score 4/5), p < 0.001. The use of magnetic marker localization (MaMaLoc) for early-stage breast cancer is effective and has higher surgical usability than standard WGL. 相似文献
96.
97.
98.
99.
100.
Dane Christina Daoud MD Elena M. S. Cartagena MD MSc Katherine J. P. Schwenger RD PhD Nicha Somlaw MD Leah Gramlich MD Scott Whittaker MD David Armstrong MD Brian Jurewitsch PharmD Matreyi Raman MD Donald R. Duerksen MD James D. McHattie MD Johane P. Allard MD 《JPEN. Journal of parenteral and enteral nutrition》2022,46(2):348-356