全文获取类型
收费全文 | 3673篇 |
免费 | 218篇 |
国内免费 | 26篇 |
专业分类
耳鼻咽喉 | 32篇 |
儿科学 | 43篇 |
妇产科学 | 25篇 |
基础医学 | 439篇 |
口腔科学 | 103篇 |
临床医学 | 163篇 |
内科学 | 954篇 |
皮肤病学 | 109篇 |
神经病学 | 340篇 |
特种医学 | 103篇 |
外科学 | 668篇 |
综合类 | 12篇 |
预防医学 | 245篇 |
眼科学 | 96篇 |
药学 | 190篇 |
中国医学 | 9篇 |
肿瘤学 | 386篇 |
出版年
2023年 | 23篇 |
2022年 | 27篇 |
2021年 | 70篇 |
2020年 | 36篇 |
2019年 | 50篇 |
2018年 | 73篇 |
2017年 | 67篇 |
2016年 | 81篇 |
2015年 | 81篇 |
2014年 | 109篇 |
2013年 | 141篇 |
2012年 | 211篇 |
2011年 | 262篇 |
2010年 | 145篇 |
2009年 | 120篇 |
2008年 | 194篇 |
2007年 | 220篇 |
2006年 | 177篇 |
2005年 | 244篇 |
2004年 | 207篇 |
2003年 | 199篇 |
2002年 | 214篇 |
2001年 | 75篇 |
2000年 | 81篇 |
1999年 | 75篇 |
1998年 | 40篇 |
1997年 | 46篇 |
1996年 | 30篇 |
1995年 | 26篇 |
1994年 | 34篇 |
1993年 | 30篇 |
1992年 | 72篇 |
1991年 | 50篇 |
1990年 | 36篇 |
1989年 | 39篇 |
1988年 | 39篇 |
1987年 | 47篇 |
1986年 | 33篇 |
1985年 | 27篇 |
1984年 | 18篇 |
1983年 | 20篇 |
1982年 | 11篇 |
1979年 | 16篇 |
1978年 | 9篇 |
1975年 | 10篇 |
1974年 | 10篇 |
1973年 | 12篇 |
1971年 | 11篇 |
1969年 | 13篇 |
1967年 | 10篇 |
排序方式: 共有3917条查询结果,搜索用时 15 毫秒
81.
Kihara Mari Sugihara Takahiko Asano Junichi Sato Midori Kaneko Hiroshi Muraoka Sei Ohshima Shiro Nanki Toshihiro 《Clinical rheumatology》2022,41(12):3661-3673
Clinical Rheumatology - To describe clinical characteristics of patients in Japan with coronavirus disease 19 (COVID-19) and pre-existing rheumatic disease and examine the possible risk factors... 相似文献
82.
BACKGROUND--Shunt vessels were imaged and shunt flow was analysed by cross sectional and Doppler echocardiography in 12 patients who had had 14 shunt procedures (nine left Blalock-Taussig shunts, three right Blalock-Taussig shunts, one modified Waterston shunt, and one central shunt). METHODS--The shunt vessels were classified by echocardiography as uniformly patent, segmentally stenosed, and uniformly stenosed. These findings were compared with those of angiography. Also the peak flow velocities at the aortic and the pulmonary ends of the shunt vessels were measured by Doppler echocardiography and the ratio of these values was calculated for each shunt. RESULTS--Twelve (85.7%) of 14 shunt vessels were imaged along their entire length by cross sectional echocardiography. The two remaining shunt vessels were only partially imaged. In 10 patients who also had angiography the echocardiographic and angiographic images of the shunt vessels were identical. The ratio of the peak flow velocity measured at the aortic and the pulmonary ends of the shunt vessel was significantly larger in the segmentally stenosed shunt vessels than in the uniformly patent shunt vessels (p < 0.001). The ratio in the two shunt vessels only partially imaged by cross sectional echocardiography indicated that they were segmentally stenosed. CONCLUSION--The combination of cross sectional and Doppler echocardiography may be useful for determining either the patency or the morphology of an aortopulmonary shunt. 相似文献
83.
84.
Toko Maehara Kenjiro Matsumoto Kazuhide Horiguchi Makoto Kondo Satoshi Iino Shunji Horie Takahisa Murata Hirokazu Tsubone Shoichi Shimada Hiroshi Ozaki Masatoshi Hori 《British journal of pharmacology》2015,172(4):1136-1147
Background and Purpose
Post-operative ileus (POI) is induced by intestinal inflammation. Here, we aimed to clarify the effects of 5-HT3 receptor antagonists against POI.Experimental Approach
We administered three 5-HT3 receptor antagonists, ondansetron, tropisetron and palonosetron, to a mouse model of POI induced by surgical intestinal manipulation (IM). Immunohistochemistry, intestinal transit, inflammatory mediator mRNA expression and 5-HT content were measured. In some experiments, 5-HT3A receptor null mice were used.Key Results
Three 5-HT3 receptor antagonists reduced IM-induced infiltration of inflammatory CD68-positive macrophages and myeloperoxidase-stained neutrophils. Ondansetron exhibited no anti-inflammatory actions in 5-HT3A receptor null mice. Ondansetron inhibited expression of the chemokine CCL2, IL-1β, IL-6, TNF-α and iNOS mRNAs up-regulated by IM, and also ameliorated the delayed gastrointestinal transit. Peritoneal macrophages, but not most infiltrating monocyte-derived macrophages, expressed 5-HT3 receptors. IM stimulation increased the 5-HT content of peritoneal lavage fluid, which up-regulated mRNA expression of proinflammatory cytokines in peritoneal macrophages. Immunohistochemical localization of 5-HT3 receptors suggests that ondansetron suppressed expression of these mRNAs in activated peritoneal macrophages, adhering to the serosal region of the inflamed intestinal wall.Conclusion and Implications
5-HT3 receptor antagonists were anti-inflammatory, mainly targeting peritoneal macrophages expressing these receptors. They also restored the delayed gastrointestinal transit by IM. 5-HT3 receptor antagonists should be therapeutically useful agents against POI. 相似文献85.
Akane Anai Kimiyo Ueda Koichi Harada Takahiko Katoh Kumiko Fukumoto Chang-Nian Wei 《Environmental health and preventive medicine》2015,20(6):447-454
Objectives
To assess the difference between self-reported and measured weight values in Japanese men and women and to determine the underlying determinants of the differences between self-reported and measured values.Methods
The data were collected from 363 general Japanese individuals aged 16–88 years living in Kumamoto prefecture. Participants completed a self-administered questionnaire designed for this study with self-reported weight and height values. Measured weight and height were measured immediately after questionnaire completion. Paired t-tests identified differences between self-reported and measured values by sex. Multiple-stepwise regression analysis examined the independent variables’ effects on the differences between self-reported and measured weights.Results
Significant differences were found between self-reported and measured values for both sexes (p < 0.001). There was a significant negative relationship between the difference in an individual’s self-reported and measured weight in each sex, with higher measured weight individuals more likely to underestimate their weight. Multiple-stepwise regression analysis models explained 12.1 % (p < 0.01), 11.3 % (p < 0.01), and 5.6 % (p < 0.01) of the variance in all participants, men, and women, respectively. Significant effects were found for age, weight measurement frequency, and measured weight in total participants, weight measurement frequency, and measured weight for men, and age for women.Conclusions
In this study, the mean absolute value of the weight and height variances proved the unreliability of self-reported weight and height values. This study’s findings suggest self-reported weight inaccuracy especially for obese populations. This should be adjusted when using it in epidemiological studies and healthcare planning.86.
87.
Mitsuyasu Terashima Hideaki Kaneda Yasuhiro Honda Tetsuro Shimura Atsuko Kodama Maoto Habara Takahiko Suzuki 《Journal of cardiology》2021,77(5):435-443
Both intravascular ultrasound (IVUS) and optical coherence tomography (OCT) play a crucial role in elucidating the pathophysiology of coronary artery disease (CAD) with the goal to improve patient outcomes of medical and/or interventional CAD management. However, no single intravascular imaging technique has been proven to provide complete and detailed evaluation of all CAD lesions due to some limitations. Although sequential use of multiple modalities may sometimes be performed, there may be issues related to risk, time, and cost. To overcome these problems, several hybrids involving dual-probe combined IVUS-OCT catheters have been developed.The aim of this review article is to demonstrate some limitations of stand-alone imaging devices for evaluation of CAD, summarize the advances in hybrid IVUS-OCT imaging devices, discuss the technical challenges, and present the potential value in the clinical setting, especially in patients receiving medical or interventional CAD management. 相似文献
88.
Toyonaga Takahiko Kobayashi Taku Kuronuma Satoshi Ueno Aito Kiyohara Hiroki Okabayashi Shinji Takeuchi Osamu Redfern Christopher P. F. Terai Hideki Ozaki Ryo Sagami Shintaro Nakano Masaru Coulthard Sally A. Tanaka Yoichi Hibi Toshifumi 《Journal of gastroenterology》2021,56(11):999-1007
Journal of Gastroenterology - Polymorphisms in the nucleotide diphosphate-linked moiety X-type motif 15 (NUDT15) gene are associated with thiopurine-induced leukopenia in patients with inflammatory... 相似文献
89.
Serum neuron specific enolase (NSE) levels in patients with non small cell lung cancer] 总被引:2,自引:0,他引:2
T Shibayama T Ohnoshi H Ueoka T Horiguchi T Kodani Y Segawa T Maeda K Miyatake N Takigawa I Kimura 《Nihon Kyōbu Shikkan Gakkai zasshi》1992,30(6):1097-1102
Serum NSE levels were measured in 126 patients with previously untreated NSCLC. The NSE level was greater than 10 ng/ml in 29 patients (23.0%) and this was considered to be positive. Elevation of serum NSE levels correlated closely with clinical stage except stage I and II. The effect of chemotherapy was evaluated in 74 cases included 22 NSE-positive cases. The response rate was 50% in positive cases and 34.6% in negative cases. However, the median duration of response in positive cases (2.2 months) was significantly shorter than that in negative cases (6.6 months). The median survival time of 6.0 months in positive cases was brief compared with 9.6 months in negative cases. These results indicate that elevation of serum NSE level in patients with NSCLC may be a marker of poor prognosis. 相似文献
90.
Takahiko Funabiki Yoichi Sakurai Masahiro Ochiai Yoshihisa Marugami Toshiki Matsubara Shigeru Hasegawa 《Journal of hepato-biliary-pancreatic sciences》1997,4(1):71-77
End-to-side choledochoduodenostomy was originally used for reconstruction between the duodenum and the biliary tree in iatrogenic bile duct stricture. However, we believe the procedure could be applied for various biliary disorders. We have recently shown the high carcinogenicity of biliary epithelium in patients with pancreaticobiliary maljunction, and consequently we recommend excision of the bile duct, along with appropriate reconstruction of the biliary system to divert the flow of pancreatic juice from bile fluid, to prevent carcinoma in biliary epithelium even in patients without dilatation of the bile duct. The conditions causing primary or recurrent bile duct stones must be removed. We employed this procedure for biliary reconstruction in 42 patients with pancreatico-biliary maljunction and in 30 patients with various benign biliary diseases, such as bile duct stones and benign biliary stenosis. We also used the procedure for palliation in 6 patients with malignant tumors around the head of the pancreas. Among these 78 patients over 20 years, we experienced 5 cases of reflux cholangitis with anastomotic stenosis, for which conservative dilatation was required. This procedure of end-to-side choledochoduodenostomy could be widely applicable for biliary reconstruction in terms of its being simplicity, minimal invasiveness and the establishment of a single physiological route for bile flow into the duodenum. 相似文献