全文获取类型
收费全文 | 2247篇 |
免费 | 132篇 |
国内免费 | 5篇 |
专业分类
耳鼻咽喉 | 27篇 |
儿科学 | 42篇 |
妇产科学 | 34篇 |
基础医学 | 304篇 |
口腔科学 | 28篇 |
临床医学 | 128篇 |
内科学 | 527篇 |
皮肤病学 | 68篇 |
神经病学 | 208篇 |
特种医学 | 58篇 |
外科学 | 327篇 |
综合类 | 10篇 |
预防医学 | 85篇 |
眼科学 | 23篇 |
药学 | 257篇 |
中国医学 | 2篇 |
肿瘤学 | 256篇 |
出版年
2023年 | 17篇 |
2022年 | 35篇 |
2021年 | 80篇 |
2020年 | 48篇 |
2019年 | 57篇 |
2018年 | 74篇 |
2017年 | 64篇 |
2016年 | 69篇 |
2015年 | 52篇 |
2014年 | 83篇 |
2013年 | 94篇 |
2012年 | 124篇 |
2011年 | 141篇 |
2010年 | 70篇 |
2009年 | 67篇 |
2008年 | 121篇 |
2007年 | 133篇 |
2006年 | 121篇 |
2005年 | 94篇 |
2004年 | 88篇 |
2003年 | 64篇 |
2002年 | 61篇 |
2001年 | 58篇 |
2000年 | 48篇 |
1999年 | 42篇 |
1998年 | 22篇 |
1997年 | 14篇 |
1996年 | 6篇 |
1995年 | 13篇 |
1994年 | 14篇 |
1993年 | 23篇 |
1992年 | 51篇 |
1991年 | 46篇 |
1990年 | 50篇 |
1989年 | 33篇 |
1988年 | 37篇 |
1987年 | 30篇 |
1986年 | 30篇 |
1985年 | 21篇 |
1984年 | 24篇 |
1983年 | 14篇 |
1982年 | 4篇 |
1981年 | 7篇 |
1979年 | 7篇 |
1977年 | 10篇 |
1976年 | 5篇 |
1975年 | 6篇 |
1973年 | 2篇 |
1972年 | 2篇 |
1971年 | 2篇 |
排序方式: 共有2384条查询结果,搜索用时 296 毫秒
1.
2.
3.
Y Ito T Koide S Sakai K Miya K Misawa I Sasaoka 《Hinyokika kiyo. Acta urologica Japonica》1986,32(10):1527-1531
A 50-year-old man with the symptom of anal pain was treated by pelvic exenteration, ileal conduit diversion and artificial anus. The pathologic diagnosis was leiomyosarcoma of the prostate. At 5 months post-operatively, the patient had no evidence of metastasis or recurrence. 相似文献
4.
We investigated the involvements of sympathetic and nonadrenergic nervous systems in the inhibitory reflex following bronchoconstriction in dogs. Inhalations of a 0.00125% solution of histamine and Ascaris suum antigen (3 mg protein) to the bronchial side induced reflex tracheal constriction following bronchoconstriction. An intra-arterial infusion of 5 micrograms/min of atropine to the tracheal site changed the reflex tracheal constrictions by histamine and antigen inhalations into tracheal dilatations. The reflex tracheal dilatations were abolished by the combination of intra-arterial propranolol (100 micrograms) and transections of both the bilateral superior laryngeal nerves and the spinal cord at the C1 level. The reflex tracheal constrictions induced by histamine and antigen inhalations were increased with 100 micrograms propranolol. Furthermore, the reflex tracheal constrictions were enhanced by the combination of 100 micrograms propranolol and transection of the spinal cord. These findings indicate that during the constriction of the bronchial smooth muscle, not only a reflex tracheal constriction mechanism but also one of reflex dilatation operates and that the latter reflex response may be mainly mediated by the sympathetic nerves, with partial involvement of the nonadrenergic nerves. This inhibitory reflex may attenuate asthmatic bronchoconstriction. 相似文献
5.
Hiroyasu Sakai Shinobu Otogoto Yoshihiko Chiba Kazuho Abe Miwa Misawa 《Journal of Smooth Muscle Research》2004,40(1):25-34
While nonspecific airway hyperresponsiveness (AHR) is a central feature of allergic bronchial asthma, the mechanism underlying the development of AHR is not clearly understood. We have previously demonstrated in vitro hyperresponsiveness of bronchial smooth muscle to acetylcholine (ACh) in rats that were actively sensitized and repeatedly challenged with aerosolized antigen. It has also been demonstrated that the ACh-induced, RhoA-mediated Ca(2+) sensitization is markedly augmented concomitantly with an increased expression and activation of RhoA protein in the bronchial smooth muscle of the antigen-treated rats. In the present study, we have investigated whether TNF-alpha, a proinflammatory cytokine which is involved in bronchial asthma, causes upregulation of RhoA mRNA and protein in the rat bronchus. Treatment of rat bronchial smooth muscle preparations with TNF-alpha (300 ng/ml for 24 hr) significantly shifted the concentration-response curve to ACh upwards, but did not alter the response to high K(+), when compared to that of control tissues. Levels of RhoA mRNA and protein in the TNF-alpha-treated bronchus were significantly greater than those in the control group. In conclusion, it is suggested that the augmentation of the ACh-induced contractile response evoked by TNF-alpha might be mediated by an upregulation of RhoA in rat bronchial smooth muscle. 相似文献
6.
Tissue renin content in superficial, midcortical, and juxtamedullary afferent arterioles in rabbits]
Tissue renin content within the kidney decreases from outer to inner cortex. However, it is not known whether this gradient is due to a decrease in the number of afferent arterioles from the outer to inner cortex or the decrease in renin content per afferent arteriole. Furthermore, it is still controversial whether sodium depletion increases or decreases this gradient. According to Taugner et al., sodium depletion induces the extension of renin positive part of afferent arterioles from vascular pole toward interlobular artery. Since the length of extension may differ among superficial, midcortical, and juxtamedullary afferent arterioles, the observed gradient may vary depending on whether the entire afferent arteriole or only the vascular pole is examined. In the present study, we microdissected the entire afferent arterioles from superficial, middle, and juxtamedullary cortex of rabbit kidney, and examined tissue renin content. We studied: 1. whether tissue renin content per afferent arteriole decreases from the outer to inner cortex. 2. whether sodium depletion affects the gradient of tissue renin content within the cortex. In result, we reached the conclusions, as follows: 1. Tissue renin content per afferent arteriole decreases steeply from superficial to midcortical to juxtamedullary afferent arterioles. 2. The absolute difference in renin content among the three types of afferent arterioles becomes greater during sodium depletion. The internephron heterogeneity of tissue renin content may contribute to functional heterogeneity. 相似文献
7.
Y Misawa T Hasegawa K Fukushima Y Sohara M Katoh F Murayama N Hasegawa H Horimi T Saitoh T Yamaguchi 《[Zasshi] [Journal]. Nihon Kyōbu Geka Gakkai》1992,40(7):1085-1088
Following cardiac surgery, approximation of sternum will produce systemic hypotension or elevation of left atrial and central venous pressures. A new criteria for delayed sternal closure is proposed. Sternal closure has to be delayed when mean left atrial or central venous pressures increased over 2 mmHg at the tentative closure. In seven cases (3.5%) of consecutive 201 patients was delayed the sternal closure under the above mentioned state, all survived and received the successful closure later. One of them died of congestive heart failure four months after the operation and one died of the rupture of the ascending aortic pseudoaneurysm eleven months after the initial operation. Microbiological examination of the mediastinal and pericardial contents obtained at the final sternal closure were negative in all cases. Comparing the total cardiopulmonary bypass time, ventricular fibrillation time, and myocardial ischemic time between in the secondary closure group and in the primary closure group, the total bypass time and the ventricular fibrillation time of the former were significantly longer than the latter, but the ischemic time revealed no difference. In conclusions, persistent elevation of left atrial or central venous pressures after cardiac surgery at the tentative sternal closure seems the reliable predictor for the delayed closure of the sternum. Careful post-operative management prevents serious mediastinal infection. Delayed sternal closure is preferable procedure for the patient with brittle hemodynamics after open heart surgery. 相似文献
8.
Hiroaki Shiba Takeyuki Misawa Susumu Kobayashi Tokuyasu Yokota Kyonsu Son Katsuhiko Yanaga 《Journal of gastrointestinal surgery》2007,11(4):549-551
A 41-year-old Chinese woman was admitted to our hospital with epigastric pain. Computed tomography detected a heterogeneous
enhancement tumor fed by the left gastroepiploic artery in the left lower quadrant and cholelithiasis. Excision of the tumor
in the greater omentum and cholecystectomy were performed laparoscopically. Histological findings confirmed a diagnosis of
hemangiopericytoma with low-grade malignancy. To our knowledge, hemangiopericytoma of the greater omentum is very rare, and
only 12 cases were reported in English literature. We report a case of hemangiopericytoma arising in the greater omentum and
review the literature. 相似文献
9.
Misawa Y Oki SI Tezuka Y Fuse K 《ASAIO journal (American Society for Artificial Internal Organs : 1992)》2001,47(5):563-564
Primary tissue failure of bioprosthetic heart valves refers primarily to calcification of the leaflets of the bioprosthesis. A 75 year old patient underwent reoperation 15 years after mitral valve replacement with a Carpentier-Edwards porcine bioprosthesis. The extracted bioprosthetic valve was found to have one prolapsed leaflet and a small amount of calcification on all three leaflets without tear or perforation. The two commissures suspending the prolapsed leaflet were detached, causing mitral valve regurgitation. 相似文献
10.
Repair of infarcted myocardium mediated by transplanted bone marrow-derived CD34+ stem cells in a nonhuman primate model 总被引:6,自引:0,他引:6
Yoshioka T Ageyama N Shibata H Yasu T Misawa Y Takeuchi K Matsui K Yamamoto K Terao K Shimada K Ikeda U Ozawa K Hanazono Y 《Stem cells (Dayton, Ohio)》2005,23(3):355-364
Rodent and human clinical studies have shown that transplantation of bone marrow stem cells to the ischemic myocardium results in improved cardiac function. In this study, cynomolgus monkey acute myocardial infarction was generated by ligating the left anterior descending artery, and autologous CD34(+) cells were transplanted to the peri-ischemic zone. To track the in vivo fate of transplanted cells, CD34(+) cells were genetically marked with green fluorescent protein (GFP) using a lentivirus vector before transplantation (marking efficiency, 41% on average). The group receiving cells (n = 4) demonstrated improved regional blood flow and cardiac function compared with the saline-treated group (n =4) at 2 weeks after transplant. However, very few transplanted cell-derived, GFP-positive cells were found incorporated into the vascular structure, and GFP-positive cardiomyocytes were not detected in the repaired tissue. On the other hand, cultured CD34(+) cells were found to secrete vascular endothelial growth factor (VEGF), and the in vivo regional VEGF levels showed a significant increase after the transplantation. These results suggest that the improvement is not the result of generation of transplanted cell-derived endothelial cells or cardiomyocytes; and raise the possibility that angiogenic cytokines secreted from transplanted cells potentiate angiogenic activity of endogenous cells. 相似文献