全文获取类型
收费全文 | 35182篇 |
免费 | 1935篇 |
国内免费 | 320篇 |
专业分类
耳鼻咽喉 | 456篇 |
儿科学 | 2315篇 |
妇产科学 | 769篇 |
基础医学 | 3863篇 |
口腔科学 | 615篇 |
临床医学 | 2259篇 |
内科学 | 6343篇 |
皮肤病学 | 1263篇 |
神经病学 | 1621篇 |
特种医学 | 1252篇 |
外科学 | 5349篇 |
综合类 | 1818篇 |
现状与发展 | 2篇 |
一般理论 | 13篇 |
预防医学 | 1853篇 |
眼科学 | 1755篇 |
药学 | 2781篇 |
2篇 | |
中国医学 | 414篇 |
肿瘤学 | 2694篇 |
出版年
2023年 | 237篇 |
2022年 | 658篇 |
2021年 | 1131篇 |
2020年 | 683篇 |
2019年 | 691篇 |
2018年 | 953篇 |
2017年 | 676篇 |
2016年 | 886篇 |
2015年 | 921篇 |
2014年 | 1318篇 |
2013年 | 1557篇 |
2012年 | 2160篇 |
2011年 | 2251篇 |
2010年 | 1335篇 |
2009年 | 1121篇 |
2008年 | 1743篇 |
2007年 | 1813篇 |
2006年 | 1568篇 |
2005年 | 1444篇 |
2004年 | 1335篇 |
2003年 | 1244篇 |
2002年 | 1129篇 |
2001年 | 917篇 |
2000年 | 872篇 |
1999年 | 735篇 |
1998年 | 329篇 |
1997年 | 227篇 |
1996年 | 196篇 |
1995年 | 190篇 |
1994年 | 168篇 |
1993年 | 161篇 |
1992年 | 431篇 |
1991年 | 469篇 |
1990年 | 414篇 |
1989年 | 413篇 |
1988年 | 374篇 |
1987年 | 331篇 |
1986年 | 322篇 |
1985年 | 342篇 |
1984年 | 264篇 |
1983年 | 219篇 |
1979年 | 269篇 |
1978年 | 181篇 |
1977年 | 176篇 |
1976年 | 158篇 |
1975年 | 186篇 |
1974年 | 190篇 |
1973年 | 200篇 |
1972年 | 167篇 |
1971年 | 149篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
Kui Li Jiawen Wang Shengxiong Liu Sen Su Chenjian Feng Xiaoxiang Fan Zhiyong Yin 《中华创伤杂志(英文版)》2015,18(2):65-73
Objective: To study the biomechanical mechanism of head injuries beaten with sticks, which is common in the battery or assaultive cases.
Methods: In this study, the Hybrid-III anthropomorphic test device and finite element model (FEM) of the total human model for safety (THUMS) head were used to determine the biomechanical response of head while being beaten with different sticks. Total eight Hybrid-III tests and four finite element simulations were conducted. The contact force, resultant acceleration of head center of gravity, intracranial pressure and von Mises stress were calculated to determine the different biomechanical behavior of head with beaten by different sticks.
Results: In Hybrid-III tests, the stick in each group demonstrated the similar kinematic behavior under the same loading condition. The peak values of the resultant acceleration for thick iron stick group, thin iron stick group, thick wooden stick group and thin wooden stick group were 203.4 g, 221.1 g, 170.5 g and 122.2 g respectively. In finite element simulations, positive intracranial pressure was initially observed in the frontal comparing with negative intracranial pressure in the contra-coup site. Subsequently the intracranial pressure in the coup site was decreasing toward negative value while the contra-coup intracranial pressure increasing toward positive values.
Conclusions: The results illustrated that the stiffer and larger the stick was, the higher the von Mises stress, contact force and intracranial pressure were. We believed that the results in the Hybrid-III tests and THUMS head simulations for brain injury beaten with sticks could be reliable and useful for better understanding the injury mechanism. 相似文献
2.
3.
Metabolic abnormalities of gastrointestinal mucosa in celiac disease: An in vitro proton nuclear magnetic resonance spectroscopy study 下载免费PDF全文
4.
Dinesh Singhal Nandini Vasdev Arvinder Soin Subash Gupta Samiran Nundy 《Indian journal of gastroenterology》2006,25(4):206-207
It is difficult to distinguish between carcinoid tumors of the pancreatic head and periampullary region and carcinomas preoperatively. Between 1996 and 2002, 125 consecutive pancreaticoduodenectomies done by us for periampullary tumors (14 carcinoids, 111 carcinomas) were analyzed. Patients with carcinoid tumors had significantly younger mean age (48 vs. 54 years), longer history (32 vs. 8 weeks), lower serum total bilirubin levels (1.4 vs. 6.3 mg/dL) and on CT scan, had larger, well-localized tumors (5 cm vs. 2 cm). Their postoperative course was better with no mortality or major morbidity, whereas after resection for carcinoma 7 (6.3%) patients died and 30 (27%) had major postoperative complications. Thus, a tumor of this region in a young patient with indolent history, low bilirubin level and with CT scan depicting a large expansile lesion suggests a carcinoid. Such tumors may be safely resected with low postoperative morbidity and mortality and good long-term prognosis. 相似文献
5.
Rajnish Mago MD John-Paul Gomez MD Namita Gupta MBBS Elisabeth J. S. Kunkel MD 《Current psychiatry reports》2006,8(3):228-233
Anxiety disorders and anxiety symptoms are highly prevalent in the general population and more so in the medically ill. They
have a number of negative consequences for these patients and may worsen the outcome of the medical illness and increase health
care utilization. In the evaluation of these patients, it is of paramount importance to identify the etiology of the anxiety
and, in particular, to differentiate primary from secondary anxiety. Management includes medications (especially benzodiazepines
and selective serotonin reuptake inhibitors) and psychotherapy (particularly cognitive-behavioral therapy). 相似文献
6.
There has been a remarkable change in the scenario of therapeutic apheresis in the last 14 years in India. The crude method of manual removal of blood followed by separation of plasma by gravity, keeping it in the bottle for a long time, has now been totally replaced by plasmapheresis, centrifugation, membrane filtration, and immunoadsorption techniques. The indications for use have also changed from a list of limited indications in the beginning to include all immune complex disorders. The clinical beneficiaries have also increased from blood bankers to nephrologists and immunologists in addition to oncologists. Efforts are now underway with the help of the Indian Society for Apheresis (founded in 1985) to popularize the newer methods of cryofiltration, photopheresis and heparin extracorporeal low-density lipoprotein (HELP) and DALI apheresis systems besides the specialized techniques of immunoadsorption using filters, columns, or ligands. This is suggestive of a positive trend for the treatment of immune complex disorders. 相似文献
7.
Pankaj Hari Anand Srivastava Arun Kumar Gupta Rajendra N. Srivastava 《Pediatric nephrology (Berlin, Germany)》1997,11(4):497-498
Acute renal failure (ARF) developed in a 7-week-old infant due to bilateral candidal bezoars (fungal balls) causing obstruction
at the pelviureteric junction. The baby was born at term with an appropriate birthweight, and had been treated with broad-spectrum
antibiotics for respiratory distress and septicemia during the 1st week of life. Recovery from ARF followed renal decompression
with bilateral nephrostomy tube placement and parenteral administration of amphotericin B and 5-flucytosine.
Received August 21, 1996; received in revised form and accepted January 3, 1997 相似文献
8.
S K Malhotra R Predy R Singh B L Gupta R Bhatnagar K Leeuw 《Journal of neuroscience research》1988,19(4):420-7, 472-3
A mouse monoclonal antibody (MAb 6B9, isotype IgM) was raised against autopsy tissue samples from the central nervous system (CNS) of multiple sclerosis (MS) patients. By immunofluorescence microscopy, MAb 6B9 intensely stains most or all cells in fetal rats. However, MAb 6B9 differentially stains various cell types in adult rats. Neurons, ependymal cells, and adrenal chromaffin cells are stained intensely, whereas astrocytes and oligodendrocytes are not stained. The 6B9-reactive antigen (6B9 antigen) is sensitive to periodic acid, but insensitive to treatment with protease, RNase, or hyaluronidase. Results from immunofluorescence microscopy on semithin sections and cultured neuroblastoma cells indicate that 6B9 antigen is intracellular. This is supported by immunoelectron microscopy, where labeling for 6B9 antigen appears in the cytoplasm distinct from any identifiable organelle. Further studies on 6B9 antigen should reveal its chemical nature as well as the significance of developmental changes in its distribution. 相似文献
9.
10.
Janette B Gomos Theresa M Rowe Saumendra N Sarkar Sean P Kessler Ganes C Sen 《Journal of interferon & cytokine research》2002,22(2):199-206
The 9-2 isozyme of 2-5 (A) synthetase has cellular proapoptotic functions that are mediated not by enzyme activity but by the Bcl-2 homology domain 3 present in its unique carboxyl-terminal region. Another proapoptotic cellular protein is Bax, whose absence in the Bax(-/-) mice causes male sterility due to abnormal sperm differentiation. In this study, we examined whether transgenic 9-2 expression can substitute for the in vivo reproductive function of Bax. To achieve this goal, a sperm-specific promoter was used to drive the expression of 9-2 in the sperm of transgenic mice. By selective cross-breeding, the transgene was transferred to Bax(-/-) mice to generate the experimental mouse line (Bax(-/-), 9-2(+/+)). The male experimental mice were sterile, and their testes maintained the structural abnormality found in Bax(-/-) mice. Thus, the male reproduction functions of Bax could not be replaced by the 9-2 isozyme of 2-5 (A) synthetase. 相似文献