全文获取类型
收费全文 | 3237篇 |
免费 | 227篇 |
国内免费 | 29篇 |
专业分类
耳鼻咽喉 | 47篇 |
儿科学 | 45篇 |
妇产科学 | 21篇 |
基础医学 | 307篇 |
口腔科学 | 44篇 |
临床医学 | 225篇 |
内科学 | 962篇 |
皮肤病学 | 48篇 |
神经病学 | 341篇 |
特种医学 | 92篇 |
外科学 | 608篇 |
综合类 | 33篇 |
一般理论 | 2篇 |
预防医学 | 102篇 |
眼科学 | 35篇 |
药学 | 186篇 |
中国医学 | 3篇 |
肿瘤学 | 392篇 |
出版年
2024年 | 4篇 |
2023年 | 36篇 |
2022年 | 75篇 |
2021年 | 116篇 |
2020年 | 57篇 |
2019年 | 93篇 |
2018年 | 112篇 |
2017年 | 94篇 |
2016年 | 104篇 |
2015年 | 125篇 |
2014年 | 129篇 |
2013年 | 161篇 |
2012年 | 239篇 |
2011年 | 258篇 |
2010年 | 140篇 |
2009年 | 126篇 |
2008年 | 218篇 |
2007年 | 235篇 |
2006年 | 187篇 |
2005年 | 183篇 |
2004年 | 172篇 |
2003年 | 145篇 |
2002年 | 142篇 |
2001年 | 28篇 |
2000年 | 27篇 |
1999年 | 40篇 |
1998年 | 25篇 |
1997年 | 27篇 |
1996年 | 21篇 |
1995年 | 14篇 |
1994年 | 13篇 |
1993年 | 14篇 |
1992年 | 17篇 |
1991年 | 17篇 |
1990年 | 15篇 |
1989年 | 9篇 |
1988年 | 11篇 |
1986年 | 6篇 |
1985年 | 10篇 |
1984年 | 6篇 |
1983年 | 5篇 |
1982年 | 3篇 |
1981年 | 2篇 |
1979年 | 4篇 |
1978年 | 8篇 |
1977年 | 3篇 |
1974年 | 2篇 |
1972年 | 2篇 |
1970年 | 2篇 |
1969年 | 2篇 |
排序方式: 共有3493条查询结果,搜索用时 15 毫秒
31.
Yoshihisa Hatakeyama Ryuji Sasaki Takahiro Tajima Hidetoshi Tominaga Hirotaka Miura Hiroshi Ikeda Toshikazu Saito 《Nihon Arukōru Yakubutsu Igakkai zasshi》2003,38(4):341-349
Nicotine is known to improve cognitive performance such as attention, concentration and working memory in humans and animals. Previous research suggests that nicotine enhances visuospatial attention. But it could be hypothesized that nicotine intake alleviate a withdrawal-induced deficit in smokers. To evaluate the cognitive performance in smokers and never-smokers, we investigate eye movement while 4-points saccade task is performed. 5 smokers and 6 never-smokers are matched for age and education. Eye movement was investigated by using TKK2920 (Takei Co.) which determines the direction of gaze over a two-dimensional visual field without attachments to the eye. We found that a tendency which Mean Gazing Time is prolonged in smokers. These data suggest that impairment of visual attention in smokers is not significant. 相似文献
32.
33.
Shin-ichi Fukumoto Naoko Yamauchi Hisashi Moriguchi Yoshitaka Hippo Akira Watanabe Junji Shibahara Hirokazu Taniguchi Shumpei Ishikawa Hirotaka Ito Shogo Yamamoto Hiroko Iwanari Mitsugu Hironaka Yuichi Ishikawa Toshiro Niki Yasunori Sohara Tatsuhiko Kodama Masaharu Nishimura Masashi Fukayama Hirotoshi Dosaka-Akita Hiroyuki Aburatani 《Clinical cancer research》2005,11(5):1776-1785
PURPOSE: Squamous cell carcinoma (SCC) and adenocarcinoma of the lung are currently subject to similar treatment regimens despite distinct differences in histology and epidemiology. The aim of this study is to identify a molecular target with diagnostic and therapeutic values for SCC. EXPERIMENTAL DESIGN: Genes specifically up-regulated in SCC were explored through microarray analysis of 5 SCCs, 5 adenocarcinomas, 10 small cell lung carcinomas, 27 normal tissues, and 40 cancer cell lines. Clinical usefulness of these genes was subsequently examined mainly by immunohistochemical analysis. RESULTS: Seven genes, including aldo-keto reductase family 1, member B10 (AKR1B10), were identified as SCC-specific genes. AKR1B10 was further examined by immunohistochemical analysis of 101 non-small cell lung carcinomas (NSCLC) and its overexpression was observed in 27 of 32 (84.4%) SCCs and 19 of 65 (29.2%) adenocarcinomas. Multiple regression analysis showed that smoking was an independent variable responsible for AKR1B10 overexpression in NSCLCs (P < 0.01) and adenocarcinomas (P < 0.01). AKR1B10 staining was occasionally observed even in squamous metaplasia, a precancerous lesion of SCC. CONCLUSION: AKR1B10 was overexpressed in most cases with SCC, which is closely associated with smoking, and many adenocarcinoma cases of smokers. These results suggest that AKR1B10 is a potential diagnostic marker specific to smokers' NSCLCs and might be involved in tobacco-related carcinogenesis. 相似文献
34.
Yukiko Horinouchi Jotaro Akiyoshi Aki Nagata Hirotaka Matsushita Takashi Tsutsumi Koichi Isogawa Tetsuo Noda Haruo Nagayama 《European neuropsychopharmacology》2004,14(2):157-161
Cholecystokinin 2 (CCK2) receptors have been implicated as mediators of anxiety in standard mouse models such as exploratory behavior both in black and white test boxes and in elevated plus-mazes. We investigated the role of the CCK2 receptor in anxiety by evaluating the behavior of mice lacking the gene for this receptor in these standard anxiety models (i.e., exploratory behavior in a black and white test box and exploratory behavior in an elevated plus-maze). In the black and white test box, mice lacking the CCK2 receptor gene showed significantly increased numbers of transitions between the boxes compared to control mice. In the elevated plus-maze, mice lacking the CCK2 receptor gene displayed significantly more head dips than control mice. These results suggest that mice lacking the CCK2 receptor gene are less anxious than normal mice. 相似文献
35.
Kayo Sugiyama Subaru Tanabe Hirotaka Watanuki Masato Tochii Yasuhiro Futamura Satoshi Makino Katsuhiko Matsuyama 《Clinical Case Reports》2022,10(5)
Life‐threatening cardiac events may be misdiagnosed as acute aortic dissection because of notable symptom mimicry. We report the case of a 72‐year‐old male patient with presentations presumed to be of aortic origin. However, surgery revealed posterior free‐wall perforation in the left ventricle caused by the occlusion of an obtuse marginal branch. 相似文献
36.
Involvement of catalase in the endometrium of patients with endometriosis and adenomyosis 总被引:3,自引:0,他引:3
OBJECTIVE: To determine the distribution of catalase in eutopic and ectopic endometria in patients with endometriosis or adenomyosis. DESIGN: Retrospective randomized study. SETTING: Department of obstetrics and gynecology in a university hospital. PATIENT(S): Thirty-three patients with endometriosis, 36 with adenomyosis, and 47 fertile controls (total, 116 women). MAIN OUTCOME MEASURE(S): Semiquantitative immunostaining of endometrial cells obtained by biopsy sampling, followed by calculation of an evaluation nomogram score. RESULT(S): The score of catalase in the glandular epithelium of controls group fluctuated during the menstrual cycle; it was lowest in the early proliferative phase and peaked in the late secretory phase. In patients with endometriosis, catalase scores did not fluctuate during the cycle, and scores were high compared with controls throughout the menstrual cycle. Catalase scores did not vary in patients with adenomyosis, and scores in this group were consistently higher than those in patients with endometriosis throughout the cycle. CONCLUSION(S): Abnormal expression of catalase in the eutopic and ectopic endometrium strongly suggests pathologic involvement of free radicals in endometriosis and adenomyosis. 相似文献
37.
Akira Oda Kenichi Tanaka Hirotaka Saito Tsuyoshi Iwasaki Shuhei Watanabe Hiroshi Kimura Sakumi Kazama Michio Shimabukuro Koichi Asahi Tsuyoshi Watanabe Junichiro James Kazama 《Internal medicine (Tokyo, Japan)》2022,61(11):1653
Objective Although an association between serum inorganic phosphorus levels and a poor prognosis has been noted in dialysis patients, these associations have been insufficiently reported in non-dialysis-dependent chronic kidney disease (NDD-CKD) patients. This study attempted to determine the association between serum inorganic phosphorus levels and adverse outcomes in Japanese NDD-CKD patients. Methods We investigated the relationships between serum inorganic phosphorus levels and adverse outcomes, such as kidney events, cardiovascular events, and all-cause death, in Japanese NDD-CKD patients using longitudinal data from the Fukushima CKD Cohort Study with a median follow-up period of 2.8 years. The study evaluated 822 patients with NDD-CKD enrolled between June 2012 and July 2014. A kidney event was defined as a combination of doubling of the baseline serum creatinine or end-stage renal disease. Cox regression was performed to analyze the relationships of the quartile of the serum inorganic phosphorus with kidney events, cardiovascular events, and all-cause death. Results The frequency of kidney events per 1,000 person-years exhibited a U-shaped distribution based on serum inorganic phosphorus levels, with these levels not significantly associated with an increased risk of cardiovascular events and all-cause death. A multivariable Cox regression analysis showed an increased risk of kidney events for the highest quartile of the serum inorganic phosphorus levels (≥3.7 mg/dL) versus the second quartile (2.9-3.2 mg/dL, hazard ratio, 3.30; 95% confidence interval, 1.50-7.28; p=0.003). There were no significant associations between the serum calcium levels and adverse outcomes. Conclusion Serum inorganic phosphorus levels were associated with an increased risk of CKD progression in Japanese NDD-CKD patients. 相似文献
38.
Eiji Kozawa Yoshihiro Nishida Akira Kawai Keiko Hayakawa Nokitaka Setsu Hiroyuki Kawashima Shintaro Iwata Hiroyuki Tsuchiya Satoshi Tsukushi Satoshi Takenaka Jungo Imanishi Ichiro Baba Akihito Nagano Takeshi Morii Toshiharu Shirai Koki Shimizu Hirotaka Kawano 《Cancer science》2022,113(7):2397
Chondrosarcoma is the second most common primary malignant bone tumor. In this multicenter study, we sought to evaluate the disease‐specific survival (DSS) and disease‐free survival (DFS), and prognostic factors in patients with dedifferentiated chondrosarcoma (DDCS) or grade 3 chondrosarcoma (G3CS) in Japan. We retrospectively investigated the treatment outcomes and prognostic factors in 62 patients with DDCS and 19 patients with G3CS at 15 institutions participating in the Japanese Musculoskeletal Oncology Group. We also clarified significant clinicopathological factors for oncological outcomes. In surgery for primary lesions aimed at cure, a histologically negative margin (R0) was obtained in 93% (14/15) of patients with G3CS and 100% (49/49) of patients with DDCS. The 5‐year DSS was 18.5% in patients with DDCS and 41.7% in patients with G3CS (p = 0.13). Local control was obtained in 80% (12/15) and 79.6% (39/49) of patients with G3CS and DDCS in the primary lesion after surgery with a wide surgical margin, respectively. In multivariate analysis, stage and no treatment/palliative treatment for the primary lesion were independent prognostic factors for DSS of DDCS, and age and no treatment/palliative treatment for DSS of G3CS. The 5‐year DFS rate was 22.8% in 26 patients with DDCS who did not receive adjuvant chemotherapy, and 21.4% in 14 patients who received adjuvant chemotherapy. The prognosis of DDCS remains poor, although R0 resection was carried out in most cases. Effective and/or intensive chemotherapeutic regimens or agents should be considered or developed for patients with high‐grade chondrosarcoma, particularly for those with DDCS. 相似文献
39.
Yukiyoshi Hyo Hisaki Fukushima Tamotsu Harada Hirotaka Hara 《Auris, nasus, larynx》2019,46(1):147-150
Although nasal septal abscess (NSA) was formerly common, it has become rare since the development of antibiotics. NSA, if left untreated, can lead to intracranial complications such as meningitis and eventually result in saddle-nose deformity. NSA often occurs after injury, and indigenous skin bacteria such as Staphylococcus aureus are frequently detected. We treated a patient who had injured the upper alveolus in a fall on the stairs and developed NSA two weeks later. Anaerobic bacteria, including Veillonella parvula and Peptostreptococcus sp., were detected. Symptoms were relieved by needle and incisional drainage. Our patient represents a very rare case of NSA in terms of the cause of onset and the detected bacteria. Early drainage can result in good outcomes. 相似文献
40.