全文获取类型
收费全文 | 1253篇 |
免费 | 59篇 |
国内免费 | 15篇 |
专业分类
耳鼻咽喉 | 6篇 |
儿科学 | 9篇 |
妇产科学 | 9篇 |
基础医学 | 175篇 |
口腔科学 | 34篇 |
临床医学 | 88篇 |
内科学 | 306篇 |
皮肤病学 | 26篇 |
神经病学 | 120篇 |
特种医学 | 28篇 |
外科学 | 246篇 |
综合类 | 4篇 |
预防医学 | 26篇 |
眼科学 | 36篇 |
药学 | 70篇 |
中国医学 | 1篇 |
肿瘤学 | 143篇 |
出版年
2023年 | 10篇 |
2022年 | 14篇 |
2021年 | 47篇 |
2020年 | 20篇 |
2019年 | 26篇 |
2018年 | 34篇 |
2017年 | 25篇 |
2016年 | 25篇 |
2015年 | 25篇 |
2014年 | 30篇 |
2013年 | 46篇 |
2012年 | 73篇 |
2011年 | 85篇 |
2010年 | 50篇 |
2009年 | 33篇 |
2008年 | 75篇 |
2007年 | 88篇 |
2006年 | 55篇 |
2005年 | 51篇 |
2004年 | 63篇 |
2003年 | 58篇 |
2002年 | 43篇 |
2001年 | 26篇 |
2000年 | 18篇 |
1999年 | 28篇 |
1998年 | 19篇 |
1997年 | 14篇 |
1996年 | 13篇 |
1995年 | 6篇 |
1994年 | 21篇 |
1993年 | 11篇 |
1992年 | 20篇 |
1991年 | 14篇 |
1990年 | 17篇 |
1989年 | 18篇 |
1988年 | 15篇 |
1987年 | 8篇 |
1986年 | 10篇 |
1985年 | 11篇 |
1984年 | 8篇 |
1983年 | 5篇 |
1980年 | 7篇 |
1979年 | 5篇 |
1978年 | 6篇 |
1976年 | 4篇 |
1975年 | 6篇 |
1973年 | 5篇 |
1972年 | 5篇 |
1971年 | 6篇 |
1970年 | 8篇 |
排序方式: 共有1327条查询结果,搜索用时 15 毫秒
1.
2.
3.
Haruhiko Nakamura Norihito Kawasaki Masahiko Taguchi Hajime Kitamura 《Annals of thoracic and cardiovascular surgery》2007,13(4):254-257
A minute small-cell lung cancer measuring 8 x 5 mm was detected and serially imaged by computed tomography for about a year preceding resection. Although this solid nodule showed a short overall doubling time (76 days), the growth curve included an early phase without apparent growth prior to the phase of rapid growth. Accordingly, lung cancer cannot be ruled out when a small nodule (<10 mm) does not enlarge in the first several months of computed tomographic follow-up. 相似文献
4.
5.
The fracture and inelastic behavior of A-W glass-ceramics, phosphate glasses, silicate glasses, and borate glasses were determined in simulated body fluid (SBF), kerosene, and water. By using the stable crack growth technique, an inelastic behavior was observed on the diagram of load versus load-point displacement. From these studies, it was suggested that the inelastic behavior of bioactive glass-ceramics was produced by the plastic deformation of glassy phase on the grain boundary. 相似文献
6.
Prognostic factors in patients with ipsilateral pulmonary metastasis from non-small cell lung cancer. 总被引:2,自引:0,他引:2
Tatsuo Nakagawa Norihito Okumura Kentaro Miyoshi Tomoaki Matsuoka Kotaro Kameyama 《European journal of cardio-thoracic surgery》2005,28(4):635-639
OBJECTIVE: Pulmonary metastasis of non-small cell lung cancer is classified as an advanced disease stage, with limited indications for surgical treatment. However, the prognosis of patients with pulmonary metastasis of non-small cell lung cancer is better than that of patients with distant metastases. The purpose of the present study was to analyze and detect possible prognostic factors in surgically treated patients with ipsilateral pulmonary metastasis of non-small cell lung cancer. METHODS: Among 1198 patients with non-small cell lung cancer who underwent surgery at Kurashiki Central Hospital (Okayama, Japan) from April 1982 to March 2004, a total of 48 (4.0%) patients with pathologically diagnosed ipsilateral pulmonary metastasis were retrospectively evaluated. The median follow-up time was 20.5 months (range 1-103 months) and 37 patients (77.1%) were completely followed up until their death or more than 5 years after the operation. RESULTS: Among the 48 patients, 31 (64.6%) patients had metastatic nodules in the same lobe as the primary tumor (PM1) and 17 (35.4%) patients had metastatic nodules in different ipsilateral lobes (PM2). There was no significant difference in survival between patients with PM1 and the other patients with pT4-stage IIIB, or between patients with ipsilateral PM2 and the other patients with stage IV. Univariate analysis of postoperative survival stratified according to clinicopathologic factors revealed significant differences for the radicality of resection (complete vs. incomplete), tumor size (0-30 vs. >30mm) and pathological nodal (pN) factor (among pN0, pN1 and pN2-3). Multivariate analysis revealed that tumor size (0-30 vs. >30mm) and pN factor (pN0-1 vs. pN2-3) were independent prognostic factors. CONCLUSIONS: The results of our study suggest that undergoing a complete resection, having a tumor size of 30mm or less and having no mediastinal lymph node metastases were better prognostic factors for surgically treated patients with ipsilateral pulmonary metastasis of non-small cell lung cancer. 相似文献
7.
Xianghua Zhang Fumio Tsukuda Norihito Yamamoto Ikumasa Takenaka 《International journal of urology》1997,4(5):519-521
Brain metastases from prostate cancer are rare in postmortem examinations, and even rarer in clinical series. We report an unusual case of brain metastasis from prostate cancer confirmed by antemortem diagnosis in a 72-year-old man. The metastatic brain tumor was surgically resected and the patient was kept stable for more than 19 months after diagnosis of the brain metastasis. 相似文献
8.
Kazuo Soga Takeshi Shiono Hyun Joon Kim 《Macromolecular chemistry and physics.》1993,194(12):3499-3504
A modified SiO2 was prepared by reacting SiO2 with Cl2Si(CH3)2 in toluene, on which methylaluminoxane (MAO) was supported to obtain a catalyst precursor. The mixture of the precursor and Cp2ZrCl2 (Cp: cyclopentadienyl) gave polyethylene in a high yield even by using common trialkylaluminiums as cocatalyst. Surprisingly, the MAO-free catalyst system composed of the modified SiO2 and Cp2ZrCl2 was also found to be activated by common trialkylaluminiums. 相似文献
9.
10.
Ultrastructural observation was carried out on neuroblastoma cells in a 4-year-old girl. The nuclei of these neoplastic cells were irregular with occasional cytoplasmic invaginations, and proportionally large with diffusely dispersed chromatin substance. Rare mitotic figures were also present. The cell-to-cell interfaces were relatively simple with only finely wavy membranes but without interdigitations. A few desmosomes were, however, apparent. The cytoplasmic pseudopodes were frequently observed in a limited area of the cell surface and nearly free of organelles. The main findings of the intracytoplasmic organelles consisted of some mitochondrial changes, poor development of Golgi bodies, occasional formation of focal cytoplasmic degradation, and intracytoplasmic Abrillar aggregates. Numerous large round to oval dense bodies encircled by a double membrane were highly suggestive of lipid bodies. The central area of rosette-like cell aggregates was noted to be composed of cytoplasmic processes of neoplastic cells. 相似文献