全文获取类型
收费全文 | 9985篇 |
免费 | 536篇 |
国内免费 | 60篇 |
专业分类
耳鼻咽喉 | 62篇 |
儿科学 | 183篇 |
妇产科学 | 74篇 |
基础医学 | 1261篇 |
口腔科学 | 113篇 |
临床医学 | 600篇 |
内科学 | 2706篇 |
皮肤病学 | 214篇 |
神经病学 | 589篇 |
特种医学 | 402篇 |
外科学 | 1702篇 |
综合类 | 34篇 |
预防医学 | 281篇 |
眼科学 | 250篇 |
药学 | 691篇 |
中国医学 | 19篇 |
肿瘤学 | 1400篇 |
出版年
2024年 | 9篇 |
2023年 | 66篇 |
2022年 | 146篇 |
2021年 | 253篇 |
2020年 | 129篇 |
2019年 | 183篇 |
2018年 | 225篇 |
2017年 | 186篇 |
2016年 | 239篇 |
2015年 | 281篇 |
2014年 | 338篇 |
2013年 | 388篇 |
2012年 | 621篇 |
2011年 | 708篇 |
2010年 | 415篇 |
2009年 | 328篇 |
2008年 | 626篇 |
2007年 | 673篇 |
2006年 | 682篇 |
2005年 | 684篇 |
2004年 | 736篇 |
2003年 | 704篇 |
2002年 | 673篇 |
2001年 | 102篇 |
2000年 | 79篇 |
1999年 | 113篇 |
1998年 | 121篇 |
1997年 | 110篇 |
1996年 | 99篇 |
1995年 | 75篇 |
1994年 | 84篇 |
1993年 | 97篇 |
1992年 | 62篇 |
1991年 | 49篇 |
1990年 | 37篇 |
1989年 | 43篇 |
1988年 | 33篇 |
1987年 | 44篇 |
1986年 | 21篇 |
1985年 | 16篇 |
1984年 | 20篇 |
1983年 | 15篇 |
1982年 | 7篇 |
1981年 | 9篇 |
1980年 | 9篇 |
1978年 | 4篇 |
1977年 | 9篇 |
1976年 | 5篇 |
1975年 | 4篇 |
1974年 | 6篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
2.
3.
Eijiro Morita Torao Tanaka Tetsuya Nakamura Fumitaka Terabe Ichiro Hirata Kenichi Katsu Masakazu Takazoe Akira Terano 《Digestive endoscopy》2006,18(4):263-268
Background and Aims: Video capsule endoscopy (VCE) has become increasingly important as a simple method for observing the entire small intestine. The indications for VCE are obscure gastrointestinal bleeding and investigation of Crohn’s disease (CD). However, the correlation between endoscopic findings obtained by VCE and clinical findings in known cases of CD is not clear, and we therefore investigated this in the present study. Patients and methods: In 30 patients with known CD (Crohn’s disease activity index [CDAI] 0–420; median = 158.3), double contrast enteroclysis (ENT) was performed 1–3 weeks prior to VCE. The relationship between the VCE findings and hematological analysis/CDAI was examined. Results: In 17 of 30 patients, the entire small intestine could be investigated by VCE, whereas in the remaining 13 patients the terminal ileum could not be investigated. The following exhibited positive correlations: total lesions and CDAI (correlation coefficient values: rs = 0.661, adjusted P < 0.0061), ulcers and C‐reactive protein (CRP) (rs = 0.607, adjusted P < 0.0061), total lesions and CRP (rs = 0.604, adjusted P < 0.0061). Conclusions: Analysis with VCE suggests that CDAI and CRP indicate the activity of intestinal lesions in patients with known CD, and that CRP, in particular, is associated with the activity of ulcerative lesions of the intestine. This may contribute to revised guidelines for VCE in the future. 相似文献
4.
5.
Joe Matsumoto Tetsufumi Kojima Tetsuya Shimizu Shuji Kitashiro Kazuya Konishi Yoshiyuki Matsumura You Kawarada Hitoshi Ikeda Takashi Yoshiki 《Annals of thoracic and cardiovascular surgery》2002,8(3):151-153
In lung cancer patients, hypercalcemia is a fairly common metabolic problem associated with malignancy. However, the occurrence of hypercalcemia in lung cancer patients means an ominous prognostic sign. As hypercalcemia often causes early death, quick diagnosis and treatment for hypercalcemia are required. A 69-year-old woman was admitted to our hospital with anorexia caused by hypercalcemia. On admission, serum level of PTH was elevated and PTHrP was normal. From the results of CT findings and transbronchial lung biopsy, the cause of the hypercalcemia was determined as lung cancer incidentally complicated with primary hyperparathyroidism. First, serum calcium level was returned to normal through hydration with saline and bisphosphonates. Next, left hemithyroidectomy for primary hyperparathyroidism was performed. Histologically, the tumor was diagnosed as parathyroid adenoma. Fifteen days later, left lower lobectomy for primary lung cancer was performed under a video-assisted thoracoscopic approach. Histologically, the tumor was diagnosed as a moderately differentiated adenocarcinoma. Four years and three months after the operation, the patient is alive and well with no sign of recurrence. When a lung cancer patient is complicated with hypercalcemia, we need to consider that primary hyperparathyroidism is a possible cause of the hypercalcemia. 相似文献
6.
7.
Tetsuya Nomura Tatsuya Kawasaki Takuji Tanabe Akihiro Azuma Hiroaki Matsubara 《Annals of thoracic and cardiovascular surgery》2007,13(2):118-121
Mediastinal cystic tumors are well-marginated round lesions that comprise 12% to 18% of all mediastinal masses. These lesions include a variety of diseases with overlapping radiologic appearances and variable prognoses. Pathological examinations are almost always required for differential diagnosis. We encountered a case of anterior mediastinal tumor discovered in the process of investigation of Raynaud's phenomenon. Taking into account the tumor location, a pericardial cyst was initially suspected. However, the tumor was surgically resected and histopathological examinations demonstrated thymus-like tissue in the cyst walls. Raynaud's phenomenon greatly improved after surgery. These findings suggested that cystic thymoma originated from ectopic thymic tissue and is accompanied by paraneoplastic syndrome. 相似文献
8.
Tetsuya Ozeki Shuji Beppu Takuto Mizoe Yuuki Takashima Hiroshi Yuasa Hiroaki Okada 《Journal of controlled release》2005,107(3):387-394
In this study, we used a novel 4-fluid nozzle spray drier to prepare composite microparticles of a water-insoluble drug, flurbiprofen (FP), and a water-soluble drug, sodium salicylate (SS), for the purpose of improving the water solubility of FP. An ethanol solution of FP and an aqueous SS solution were simultaneously introduced through different liquid passages in the 4-fluid nozzle spray drier and then spray-dried. Quantitative elemental analysis suggested that the FP/SS ratio in each composite microparticle was nearly the same as the formulation ratio. We also found that SS and FP exist in a low crystallinity state in the composite particles. Release of FP from dissolved composite microparticles was markedly improved because of an increase in the effective surface area following rapid dissolution of SS. This study shows that it is possible to prepare FP-SS composite microparticles using a 4-fluid nozzle spray drier in single process and that this can improve the ability of FP to dissolve in water. 相似文献
9.
10.