全文获取类型
收费全文 | 1080367篇 |
免费 | 80267篇 |
国内免费 | 3327篇 |
专业分类
耳鼻咽喉 | 13956篇 |
儿科学 | 36973篇 |
妇产科学 | 30535篇 |
基础医学 | 156296篇 |
口腔科学 | 29634篇 |
临床医学 | 97021篇 |
内科学 | 211546篇 |
皮肤病学 | 24599篇 |
神经病学 | 86728篇 |
特种医学 | 41653篇 |
外国民族医学 | 328篇 |
外科学 | 161245篇 |
综合类 | 25301篇 |
一般理论 | 427篇 |
预防医学 | 82624篇 |
眼科学 | 23935篇 |
药学 | 78684篇 |
6篇 | |
中国医学 | 2517篇 |
肿瘤学 | 59953篇 |
出版年
2019年 | 8715篇 |
2018年 | 12315篇 |
2017年 | 9585篇 |
2016年 | 10803篇 |
2015年 | 12252篇 |
2014年 | 16600篇 |
2013年 | 25202篇 |
2012年 | 33220篇 |
2011年 | 35229篇 |
2010年 | 21363篇 |
2009年 | 19991篇 |
2008年 | 32700篇 |
2007年 | 34582篇 |
2006年 | 34845篇 |
2005年 | 33350篇 |
2004年 | 32978篇 |
2003年 | 31716篇 |
2002年 | 30779篇 |
2001年 | 50031篇 |
2000年 | 51082篇 |
1999年 | 42721篇 |
1998年 | 12180篇 |
1997年 | 10862篇 |
1996年 | 10844篇 |
1995年 | 10434篇 |
1994年 | 9685篇 |
1993年 | 9057篇 |
1992年 | 33731篇 |
1991年 | 32955篇 |
1990年 | 32287篇 |
1989年 | 31093篇 |
1988年 | 28273篇 |
1987年 | 28318篇 |
1986年 | 26410篇 |
1985年 | 25469篇 |
1984年 | 19053篇 |
1983年 | 16109篇 |
1982年 | 9672篇 |
1981年 | 8704篇 |
1979年 | 17358篇 |
1978年 | 12573篇 |
1977年 | 10642篇 |
1976年 | 10043篇 |
1975年 | 10559篇 |
1974年 | 12757篇 |
1973年 | 12239篇 |
1972年 | 11255篇 |
1971年 | 10458篇 |
1970年 | 9688篇 |
1969年 | 9057篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
991.
992.
993.
994.
995.
B Cornette de Saint-Cyr L J Garey G F Maillard C Aharoni 《Journal of plastic, reconstructive & aesthetic surgery》2007,60(12):1277-1286
We describe a novel procedure for an anatomically-based face lift to correct vertical vectors in the ageing face. It has the advantage of surgical simplicity, minimal tissue removal and minimal risk. It provides an effective readjustment of cheek volume and correction of periorbital hollowness. Natural facial expression is preserved largely because there is no change in the position of the lateral canthus. The cheek is mobilised subperiosteally through a blepharoplasty incision. A second dissection is made via a short temporal incision, to join the infraorbital dissection. A Hagedorn needle is then inserted through a point inferior to the lateral canthus and in line horizontally with the nasal ala. It is passed to the orbital incision, charged with a loop of suture material, and pulled down again to the cheek incision, from where it is pushed back to the orbit to suspend the cheek. The upper border of orbicularis oculi is fixed firmly to the temporalis aponeurosis at the level of the temporal incision. We now frequently use an Endotine Midface device for fixation. Of the first 150 patients, results were excellent or good in 145. This represents a revival of the subperiosteal mask lift, and abandons the use of endoscopic techniques. In spite of its simplicity, the operation involves subperiosteal dissection as well as delicate eyelid surgery that necessitate plastic surgical skill. 相似文献
996.
997.
Fluconazole resistance in AIDS patients. 总被引:14,自引:0,他引:14
998.
Deoxycholic acid (DA) caused a dose-related release of histamine (HR) from mast cells of rat peritoneum (RPMC) and mucosal cells of guinea pig rectocolon (RCMC). In both cell populations, DA-induced HR was: (1) accompared by a parallel release of lactate dehydrogenase (LDH), (2) not affected by metabolic inhibitors, (3) dependent on time of incubation, temperature and pH, and affected by Ca++ concentration in RPMC but not in RCMC. DA-induced HR from RCMC may be involved in certain functional disorders of the colon. 相似文献
999.
Previous pharmacological studies with the pituitary gland have suggested that acetylcholine (ACh) might be involved in the regulation of intermediate lobe (IL) function. Whether ACh is endogenous to the IL cells or provided from an extrinsic source is unclear. The present experiments tested the possibility that the endocrine cells of the IL may be a source of ACh by measuring certain cholinergic markers in a primary culture of dissociated porcine cells. The endogenous ACh content was readily measurable in both the freshly dissociated IL cells and in 2- or 4-day primary cultures. Choline acetyltransferase activity was also measurable in the freshly dissociated and cultured IL cells and was reduced by 53% in the presence of a specific inhibitor, napthylvinylpyridine (50 μM). IL cells incubated in the presence of [14C]choline (1 μM) were able to synthesize [14C]ACh and the accumulation of the new ACh was inhibited by hemicholinium-3 (30 μM), a competitive inhibitor of high affinity choline uptake at cholinergic nerve terminals. In conclusion, these results demonstrate that the endocrine cells of the IL are capable of synthesizing and storing ACh. 相似文献
1000.