全文获取类型
收费全文 | 8967篇 |
免费 | 512篇 |
国内免费 | 42篇 |
专业分类
耳鼻咽喉 | 88篇 |
儿科学 | 219篇 |
妇产科学 | 136篇 |
基础医学 | 1289篇 |
口腔科学 | 223篇 |
临床医学 | 619篇 |
内科学 | 2346篇 |
皮肤病学 | 350篇 |
神经病学 | 655篇 |
特种医学 | 266篇 |
外科学 | 894篇 |
综合类 | 51篇 |
一般理论 | 1篇 |
预防医学 | 505篇 |
眼科学 | 183篇 |
药学 | 640篇 |
中国医学 | 43篇 |
肿瘤学 | 1013篇 |
出版年
2024年 | 11篇 |
2023年 | 62篇 |
2022年 | 131篇 |
2021年 | 230篇 |
2020年 | 135篇 |
2019年 | 180篇 |
2018年 | 237篇 |
2017年 | 214篇 |
2016年 | 238篇 |
2015年 | 222篇 |
2014年 | 336篇 |
2013年 | 374篇 |
2012年 | 554篇 |
2011年 | 653篇 |
2010年 | 376篇 |
2009年 | 378篇 |
2008年 | 502篇 |
2007年 | 611篇 |
2006年 | 573篇 |
2005年 | 596篇 |
2004年 | 613篇 |
2003年 | 527篇 |
2002年 | 453篇 |
2001年 | 121篇 |
2000年 | 100篇 |
1999年 | 109篇 |
1998年 | 88篇 |
1997年 | 62篇 |
1996年 | 59篇 |
1995年 | 50篇 |
1994年 | 42篇 |
1993年 | 41篇 |
1992年 | 54篇 |
1991年 | 64篇 |
1990年 | 65篇 |
1989年 | 64篇 |
1988年 | 64篇 |
1987年 | 60篇 |
1986年 | 42篇 |
1985年 | 37篇 |
1984年 | 41篇 |
1983年 | 29篇 |
1982年 | 12篇 |
1981年 | 9篇 |
1980年 | 14篇 |
1978年 | 8篇 |
1977年 | 14篇 |
1975年 | 7篇 |
1974年 | 9篇 |
1966年 | 8篇 |
排序方式: 共有9521条查询结果,搜索用时 15 毫秒
91.
Hozumi Katsuto; Kobori Akiko; Sato Takehito; Nishimura Takashi; Habu Sonoko 《International immunology》1996,8(10):1473-1481
92.
Hirose M Yoda K Sakai K Saitoh A Nakagawa H Tanaka M Miyazaki M 《Journal of anesthesia》1991,5(1):30-35
Prostaglandin E1-induced hypotension (25% reduction from the preadministration level in mean arterial pressure) was applied to thirteen patients. Eight patients among them were operated in the supine position (group I) and other five in the prone position (group II). The maintenance dose of PGE1 was considerably lower in group II than in group I (0.067µg·kg–1·min–1 vs. 0.119µg·kg–1·min–1). In group I, there was a significant increase in CI, with a significant decrease in SVRI and PVRI during PGE1-induced hypotension. Such a high dose of PGE1 (0.119µg·kg–1·min–1) was considered to have a direct dilating action on the systemic resistance bed as well as on the pulmonary vasculature. It was considered that the suppression of hypoxic pulmonary vasoconstriction could be a mechanism to increase venous admixture during PGE1-induced hypotension. In group II, there was no significant increase in CI, and no significant decrease in SVRI and PVRI. PGE1-induced hypotension can be safely applied to the anesthetized patients, but we should be careful to apply it to the patients in the prone position, because lower dose of PGE1 can induce severe hypotension, which is not accompanied by the increase in CI as occures in the patients in the supine position.(Hirose M, Yoda K, Sakai K, et al.: Comparative Study on the cardio-respiratory change during prostaglandin E1-induced hypotention in the patients in the supine and prone position. J Anesth 5: 30–35, 1991) 相似文献
93.
94.
Expression of vascular endothelial growth factor (VEGF)-D and its receptor, VEGF receptor 3, as a prognostic factor in endometrial carcinoma. 总被引:20,自引:0,他引:20
Yoshihito Yokoyama D Stephen Charnock-Jones Diana Licence Atsushi Yanaihara Julie M Hastings Cathrine M Holland Makoto Emoto Akiko Sakamoto Tomomi Sakamoto Hidetoshi Maruyama Shigemi Sato Hideki Mizunuma Stephen K Smith 《Clinical cancer research》2003,9(4):1361-1369
PURPOSE: To evaluate the prognostic value of vascular endothelial growth factor (VEGF)-D and VEGF receptor (VEGFR)-3 in endometrial carcinoma. EXPERIMENTAL DESIGN: We assessed the levels of immunoreactivity for VEGF-D and VEGFR-3 in 71 endometrial carcinomas, 14 complex atypical endometrial hyperplasias, and 16 normal endometria by immunohistochemistry. RESULTS: VEGF-D was stained in both tumor cells and adjacent stromal cells. VEGFR-3 was stained in both tumor cells and adjacent endothelial cells. Immunoreactivity for VEGF-D in tumor cells and adjacent stromal cells became significantly stronger as lesions progressed from normal endometrium to advanced carcinoma. Similarly, immunoreactivity for VEGFR-3 in tumor cells and adjacent endothelial cells was significantly greater as lesions progressed from normal endometrium to advanced carcinoma. A strong correlation was found between high levels of VEGF-D immunoreactivity in carcinoma cells and VEGFR-3 in both carcinoma cells and adjacent endothelial cells. Similarly, high levels of VEGF-D immunoreactivity in stromal cells were significantly correlated with those of VEGFR-3 in both carcinoma cells and endothelial cells. High levels of VEGF-D in carcinoma cells and stromal cells, as well as those of VEGFR-3 in carcinoma cells and endothelial cells, were significantly related to myometrial invasion and lymph node metastasis. A strong correlation was found between poor survival and high levels of VEGF-D in both carcinoma cells and stromal cells and between poor survival and high levels of VEGFR-3 in carcinoma cells. Moreover, the high levels of VEGF-D in stromal cells and VEGFR-3 in carcinoma cells were independent prognostic factors in endometrial carcinoma. CONCLUSIONS: The presence of VEGF-D and VEGFR-3 in endometrial carcinoma may predict myometrial invasion and lymph node metastasis and may prospectively identify patients who are at increased risk for poor outcome. In addition, VEGF-D and VEGFR-3 may be promising targets for new therapeutic strategies in endometrial carcinoma. 相似文献
95.
96.
Okubo Akiko Sameshima Munefumi Sakamoto Taiji 《Albrecht von Graefes Archiv fur klinische und experimentelle Ophthalmologie》2004,242(11):962-965
Purpose The aim of this study was to describe the clinical course in a patient with polypoidal choroidal vasculopathy (PCV).Methods A 68-year-old man with PCV in the left eye was followed up by means of routine examinations including fluorescein angiography and indocyanine green angiography for over 60 months.Results Throughout the follow-up period, the patient experienced repeated lesions in the macula, such as serosanguineous detachment of the retinal pigment epithelium and neurosensory retina, but retained good visual acuity. Indocyanine green angiography disclosed spontaneous regression of polypoidal vessels followed by significant changes in the choroidal circulation: a group of polypoidal structures disappeared, and after several months a small choroidal vessel became apparent that was distant from the previously observed polypoidal structure rather than representing an extension of the original lesion.Conclusion The clinical observation suggests that in some cases of PCV the choroidal vasculature may be altered with time, in that some vessels in the inner choroid and even the choriocapillaris may close and collateral vessels and/or new vessels may develop to form complex such as that described here. 相似文献
97.
Ohno T Ikebuchi E Henomatsu K Kasai K Nakagome K Iwanami A Hiramatsu K Hata A Fukuda M Honda M Miyauchi M 《Psychiatry research》2000,100(3):155-167
Social skill deficits in schizophrenia profoundly affect patients' life-long outcome, although the profile of the underlying cognitive dysfunction still remains a matter of debate. In the present study, we investigated the relationship between social skills and event-related potentials (ERPs) in an auditory selective attention task, in addition to the neurocognitive indices obtained from the degraded-stimulus continuous performance test (CPT) and clinical indices, such as Brief Psychiatric Rating Scale (BRPS) and global assessment of function (GAF) scores. Social skills were assessed using a Japanese version of the structured role play test. Fourteen persons with schizophrenia participated in the study. Non-verbal skills showed a positive correlation with GAF, the performance level, N1 and N2b amplitude in the ERP task, and hit rate in the CPT, and a negative correlation with reaction time in the CPT. Verbal communication skills showed a positive correlation with GAF, the performance level and N2b amplitude in the ERP task, and hit rate in the CPT, and a negative correlation with reaction time in the CPT. Processing skills showed a positive correlation with the performance level and N1 amplitude in the ERP task and a negative correlation with reaction time in the CPT. These findings suggested that the social skill deficits of persons with schizophrenia were related to the vigilance level and controlled stimulus detection processing. 相似文献
98.
Naoki Ishiguro Takashi Nozawa Akiko Tsujihata Asami Saito Wataru Kishimoto Kazutoshi Yokoyama Takafumi Yotsumoto Kenji Sakai Takashi Igarashi Ikumi Tamai 《Drug metabolism and disposition》2004,32(5):519-524
We investigated influx and efflux transporters involved in blood-brain barrier transport of the nonsedative H1-antagonist epinastine. The basal-to-apical transport of [14C]epinastine was markedly higher than that in the opposite direction in LLC-GA5-COL150 cells stably transfected with human multidrug resistance (MDR)1 gene. The brain-to-plasma concentration ratio of [14C]epinastine in mdr1a/b(-/-) mice was 3.2 times higher than that in wild-type mice. The uptake of both [3H]mepyramine and [14C]epinastine into immortalized rat brain capillary endothelial cells (RBEC)1 showed temperature and concentration dependence. The kinetic parameters, K(m), V(max), and uptake clearance (V(max)/K(m)), of the initial uptake of [3H]mepyramine and [14C]epinastine by RBEC1 were 150 microM, 41.8 nmol/min/mg protein, and 279 microl/min/mg protein for mepyramine and 10.0 mM, 339 nmol/min/mg protein, and 33.9 microl/min/mg protein for epinastine, respectively. The uptake of [3H]mepyramine and [14C]epinastine by RBEC1 was inhibited by organic cations such as quinidine, amantadine, and verapamil, but not by other organic cations, tetraethyl ammonium, guanidine, and carnitine. Organic anions such as benzoic acid, estrone-3-sulfate, taurocholate, and neutral digoxin were not inhibitory. Furthermore, some cationic H1 antagonists (chlorpheniramine, cyproheptadine, ketotifen, and desloratadine) inhibited the [3H]mepyramine and [14C]epinastine uptake into RBEC1. In conclusion, the present study demonstrated that the combination of efficient efflux transport by P-glycoprotein and poor uptake by the influx transporter, which is identical with that responsible for the uptake of mepyramine, account for the low brain distribution of epinastine. 相似文献
99.
100.
Daisuke Suzuki Yoshihiro Suzuki Daisuke Sato Kenji Kikuchi Naoki Kanauchi Akiko Nishida Yasuyuki Ohta 《Internal medicine (Tokyo, Japan)》2022,61(9):1443
Anti-voltage-gated potassium channel complex antibodies-mediated disorder includes Isaacs'' syndrome, which is characterized by neuromyotonia, and Morvan syndrome, which is characterized by neuromyotonia, encephalopathy and autonomic dysfunction. We herein report a patient with Morvan syndrome that converted from Isaacs'' syndrome after thymectomy. The patient first presented with myospasm in all extremities and positivity for both anti-leucine-rich glioma inactivated 1 (LGI1) and anti-contactin-associated protein like 2 (CASPR2) antibodies and subsequently developed encephalopathy after thymectomy, which was successfully improved by immunotherapy. This is the first case of Morvan syndrome wherein thymectomy worsened Isaacs'' syndrome, suggesting that immunotherapy should be considered for Isaacs'' syndrome accompanied by positivity for both anti-LGI1 and anti-CASPR2 antibodies to prevent worsening to Morvan syndrome. 相似文献