全文获取类型
收费全文 | 11987篇 |
免费 | 542篇 |
国内免费 | 19篇 |
专业分类
耳鼻咽喉 | 200篇 |
儿科学 | 341篇 |
妇产科学 | 383篇 |
基础医学 | 1630篇 |
口腔科学 | 243篇 |
临床医学 | 810篇 |
内科学 | 2467篇 |
皮肤病学 | 369篇 |
神经病学 | 1146篇 |
特种医学 | 513篇 |
外国民族医学 | 1篇 |
外科学 | 1681篇 |
综合类 | 64篇 |
一般理论 | 3篇 |
预防医学 | 720篇 |
眼科学 | 241篇 |
药学 | 1042篇 |
中国医学 | 10篇 |
肿瘤学 | 684篇 |
出版年
2022年 | 104篇 |
2021年 | 215篇 |
2020年 | 142篇 |
2019年 | 184篇 |
2018年 | 390篇 |
2017年 | 277篇 |
2016年 | 279篇 |
2015年 | 342篇 |
2014年 | 450篇 |
2013年 | 523篇 |
2012年 | 767篇 |
2011年 | 869篇 |
2010年 | 431篇 |
2009年 | 305篇 |
2008年 | 512篇 |
2007年 | 539篇 |
2006年 | 586篇 |
2005年 | 523篇 |
2004年 | 494篇 |
2003年 | 441篇 |
2002年 | 486篇 |
2001年 | 278篇 |
2000年 | 311篇 |
1999年 | 297篇 |
1998年 | 89篇 |
1997年 | 74篇 |
1996年 | 64篇 |
1992年 | 123篇 |
1991年 | 116篇 |
1990年 | 112篇 |
1989年 | 117篇 |
1988年 | 99篇 |
1987年 | 90篇 |
1986年 | 101篇 |
1985年 | 85篇 |
1984年 | 56篇 |
1983年 | 53篇 |
1979年 | 81篇 |
1978年 | 56篇 |
1977年 | 56篇 |
1976年 | 56篇 |
1975年 | 67篇 |
1974年 | 77篇 |
1973年 | 70篇 |
1972年 | 74篇 |
1971年 | 67篇 |
1970年 | 59篇 |
1969年 | 75篇 |
1968年 | 62篇 |
1967年 | 67篇 |
排序方式: 共有10000条查询结果,搜索用时 16 毫秒
1.
Troppmair Teresa Egger J. Krösbacher A. Zanvettor A. Schinnerl A. Neumayr A. Baubin M. 《Der Anaesthesist》2022,71(4):272-280
Die Anaesthesiologie - Die Qualität eines Rettungssystems zeichnet sich auch durch den effizienten Einsatz seiner personellen und Fahrzeugressourcen aus. So können im berechtigten Fall... 相似文献
2.
3.
4.
5.
Inflammation but not obesity or insulin resistance is associated with increased plasma fibroblast growth factor 23 concentration in the elderly 下载免费PDF全文
6.
7.
8.
Dr. H. Ptok R. Steinert F. Meyer K.-P. Kröll C. Scheele F. Köckerling I. Gastinger H. Lippert 《Der Chirurg》2006,77(8):709-717
BACKGROUND: The laparoscopic resection of rectal cancer shows morbidity and oncological safety comparable to the open approach, but morbidity increases after conversion to open resection. No oncological long-term results are available for the latter patients. METHODS: From 01/01/2000-31/12/2002, patients with curatively resected rectal cancer enrolled in a observational study were evaluated for morbidity, mortality, tumor- and local recurrence rate, paying attention to patients with conversion from laparoscopic to open resection. RESULTS: 237 (3.3%) of 7,189 patients underwent laparoscopic resection (ITT). These patients showed significantly more T1/2 tumors (P<0.001) in earlier UICC stages (P<0.001) than open resected patients. 35 (14.8%) of 237 laparoscopic procedures were converted. Compared with patients receiving complete laparoscopic or open resection, these patients showed significantly higher frequencies of intraoperative (P<0.001) and general postoperative complications (P=0.003) as well as the highest overall morbidity (P=0.031). After a median follow-up of 30.1 months, the highest 5-year local recurrence rate was found in the converted group (16.0%). The laparoscopically resected patients showed a local recurrence rate of 3.3%, patients with open resection of 12.4% (P=0.082). The disease-free survival rate did not differ between the groups (P=0.585). CONCLUSION: Laparoscopic resection of rectal cancer provides oncological results similar to open resection. After conversion, the short and oncological long-term outcomes were worse. Considering a conversion rate of 15%, only a strict indication for the laparoscopic approach can be allowed, and laparoscopic resection should be performed at centers. 相似文献
9.
Andrzej Zaba Beata Greb-Markiewicz Guido Sodano Francesco De Riccardis 《Journal of basic microbiology》1995,35(6):433-439
Unsaturated ketones ( 4 and 10 ) and epoxides ( 2–3 and 8–9 ) were the main products of biotransformation performed by means of Zoophthora (Neopandora) phyllobii. Enantiospecificity of both reactions leading to these compounds strongly depends on the distance of reacting fragment of molecule from the chiral center at C-1′. 相似文献
10.
Elevated levels of the NR2C subunit of the NMDA receptor in the locus coeruleus in depression. 总被引:2,自引:0,他引:2
Low levels of the intracellular mediator of glutamate receptor activation, neuronal nitric oxide synthase (nNOS) were previously observed in locus coeruleus (LC) from subjects diagnosed with major depression. This finding implicates abnormalities in glutamate signaling in depression. Receptors responding to glutamate in the LC include ionotropic N-methyl-D-aspartate receptors (NMDARs). The functional NMDAR is a hetero-oligomeric structure composed of NR1 and NR2 (A-D) subunits. Tissue containing the LC and a nonlimbic LC projection area (cerebellum) was obtained from 13 and 9 matched pairs, respectively, of depressed subjects and control subjects lacking major psychiatric diagnoses. NMDAR subunit composition in the LC was evaluated in a psychiatrically normal subject. NR1 and NR2C subunit immunoreactivities in LC homogenates showed prominent bands at 120 and 135 kDa, respectively. In contrast to NRI and NR2C, very weak immunoreactivity of NR2A and NR2B subunits was observed in the LC. Possible changes in concentrations of NR1 and NR2C that might occur in depression were assessed in the LC and cerebellum. The overall amount of NR1 immunoreactivity was normal in the LC and cerebellum in depressed subjects. Amounts of NR2C protein were significantly higher (+ 61%, p = 0.003) in the LC and modestly, but not significantly, elevated in the cerebellum (+ 35%) of depressives as compared to matched controls. Higher levels of NR2C subunit implicate altered glutamatergic input to the LC in depressive disorders. 相似文献