全文获取类型
收费全文 | 1605篇 |
免费 | 117篇 |
国内免费 | 8篇 |
专业分类
耳鼻咽喉 | 5篇 |
儿科学 | 131篇 |
妇产科学 | 41篇 |
基础医学 | 259篇 |
口腔科学 | 16篇 |
临床医学 | 92篇 |
内科学 | 242篇 |
皮肤病学 | 25篇 |
神经病学 | 104篇 |
特种医学 | 14篇 |
外科学 | 307篇 |
综合类 | 99篇 |
预防医学 | 83篇 |
眼科学 | 16篇 |
药学 | 141篇 |
中国医学 | 4篇 |
肿瘤学 | 151篇 |
出版年
2023年 | 9篇 |
2022年 | 21篇 |
2021年 | 51篇 |
2020年 | 23篇 |
2019年 | 28篇 |
2018年 | 33篇 |
2017年 | 25篇 |
2016年 | 33篇 |
2015年 | 24篇 |
2014年 | 36篇 |
2013年 | 42篇 |
2012年 | 79篇 |
2011年 | 88篇 |
2010年 | 47篇 |
2009年 | 62篇 |
2008年 | 69篇 |
2007年 | 77篇 |
2006年 | 57篇 |
2005年 | 52篇 |
2004年 | 37篇 |
2003年 | 35篇 |
2002年 | 53篇 |
2001年 | 41篇 |
2000年 | 23篇 |
1999年 | 33篇 |
1998年 | 11篇 |
1997年 | 12篇 |
1995年 | 17篇 |
1994年 | 17篇 |
1993年 | 16篇 |
1992年 | 27篇 |
1991年 | 36篇 |
1990年 | 25篇 |
1989年 | 32篇 |
1988年 | 26篇 |
1987年 | 22篇 |
1986年 | 36篇 |
1985年 | 18篇 |
1984年 | 19篇 |
1983年 | 15篇 |
1981年 | 9篇 |
1979年 | 16篇 |
1975年 | 15篇 |
1974年 | 18篇 |
1973年 | 12篇 |
1972年 | 10篇 |
1971年 | 13篇 |
1970年 | 16篇 |
1966年 | 10篇 |
1958年 | 8篇 |
排序方式: 共有1730条查询结果,搜索用时 0 毫秒
1.
2.
3.
Sera from 130 first trimester pregnant women were tested for their serum antibody level against a naturally occurring serum antigen purified from non-pregnancy sera. IgG and IgM antibody level was measured using enzyme linked immunosorbant assay. Results indicate that patients with multiple abortion (n=26) have significantly (p=0.0029) lower level of IgG antibody and significantly (p=0.0001) higher level of IgM antibodies; against the serum antigen as compared to the patients with successful pregnancies with no history of miscarriage (n=63). Western blot analysis identified the scrum antigen recognized by the IgM antibody as a 24 kDa molecular mass component. These IgG and IgM antibodies may play an important role in the outcome of pregnancy. 相似文献
4.
G R Verma Lileshwar Kaman Gurpreet Singh Rajinder Singh Arunanshu Behera Shashank Mohan Bose 《Indian journal of gastroenterology》2006,25(1):16-19
AIM: Retrospective analysis of experience with management of external duodenal fistula (EDF) without using total parenteral nutrition (TPN). METHOD: Medical records of 31 patients with EDF following closure of duodenal ulcer perforation, treated over a 7-year period (1994-2001), were studied. Twenty-one patients (68%) had evidence of sepsis at presentation or during the course of treatment. None could afford TPN for optimum time. All patients received hospital-based enteral nutrition through nasojejunal tube, besides supportive medical treatment and/or surgery. Peritonitis or failure to insert nasojejunal tube for enteric alimentation led to early surgery. RESULTS: Two patients died of septicemia and multi-organ failure within 48 hours of admission. Fourteen patients (48.3%) initially received conservative treatment (Group I); six of them later required surgery. Fifteen patients (51.7%) underwent early surgery due to peritonitis (n=9) or failure to establish enteral feeding (n=6) (Group II); wound infection, intra-abdominal abscess and septicemia were more common in these patients than those in Group I. Survival rate was higher in Group I than in Group II (86% versus 40%; p< 0.05). Septicemia and gastrectomy were the independent factors associated with high mortality. CONCLUSIONS: EDF can be satisfactorily managed without TPN. Successful placement of enteral feeding line, supportive treatment and delayed surgery can achieve survival in 85% of patients. Minimum intervention is recommended when early surgery is performed in peritonitis or to establish enteral feeding line. 相似文献
5.
pp59v-rel exists in association with specific cellular proteins within lymphoid cells transformed by reticuloendotheliosis virus (REV-T). These include the cellular rel homolog (p75c-rel) as well as a 40-kDa avian homolog to I kappa B. The brief exposure of REV-T-transformed lymphoid cells to micromolar concentrations of ZnSO4 induces profound alterations within these protein complexes. Most of the constituents of the rel protein complexes (to include pp59v-rel, p75c-rel, and p115) translocate from the cytosol to the nucleus. This system has been used to characterize the molecular events that accompany the activation of rel protein complexes. The level of phosphorylation increases on three proteins within these complexes: pp59v-rel, p75-c-rel, and pp40. The degree of phosphorylation on pp59v-rel is such that its relative mass increases 3 to 6 kDa when resolved by SDS-polyacrylamide gel electrophoresis. pp59v-rel is phosphorylated on serine and threonine residues predominantly within a single domain of 17.5 kDa. Similarly, p75c-rel exhibits a corresponding increase in its relative mass with increased phosphorylation. The increased phosphorylation of pp40 is accompanied by its dissociation from the cytosolic rel protein complexes. These observations draw parallels with the induction of the NF-kappa B trans-activating factor. 相似文献
6.
A Nather P Balasubramaniam K Bose 《The Journal of bone and joint surgery. British volume》1990,72(5):830-834
Four different experiments were performed to study the healing of a large, non-vascularised, diaphyseal, bone segment in adult cats. In the first experiment, a 4 cm segment of tibia with its periosteum was excised and replaced in its bed. The other experiments were similar, except that in the second, the periosteum of the segment was removed, in the third its medullary canal was blocked with a Silastic rod, and in the last group the segment was isolated from its muscle bed by a Silastic sheet. The reparative processes were quantified by estimating the resorption index, the cortical new bone formation index, the callus encasement index, and the osteocyte count. Bone resorption and apposition occurred in the segment even when the periosteum was absent or the medullary canal was blocked, with osseous union at both ends by eight to 12 weeks, provided the segment was not isolated from its muscle bed. Thus, the muscle bed played a significant role in these reparative processes. 相似文献
7.
Chakrabarti A Singh K Narang A Singhi S Batra R Rao KL Ray P Gopalan S Das S Gupta V Gupta AK Bose SM McNeil MM 《Journal of clinical microbiology》2001,39(5):1702-1706
An outbreak of nosocomial fungemia due to the unusual yeast, Pichia anomala occurred in the pediatric wards of our hospital over a period of 23 months (April 1996 to February 1998). A total of 379 neonates and children (4.2% admissions) were infected. The probable index case was admitted to the pediatric emergency ward, with subsequent transmission to the premature nursery, pediatric intensive care units, and other children wards. Carriage on the hands of health care personnel was likely to be responsible for dissemination of the fungus. The outbreak could only be controlled after a health education campaign to improve hand-washing practices was instituted and after nystatin-fluconazole prophylaxis to all premature neonates and high-risk infants was introduced. In a case-control study, we identified a lower gestational age, a very low birth weight (<1,500 g), and a longer duration of hospital stay as significant risk factors associated with P. anomala fungemia in premature neonates. We conducted a culture prevalence survey of 50 consecutive premature neonates and found that 28% were colonized with P. anomala at a skin or mucosal site on the date of delivery and that 20% of these neonates subsequently developed P. anomala fungemia. We performed multilocus enzyme electrophoresis on 40 P. anomala outbreak isolates (including patient and health care workers' hand isolates), and the results suggested that these isolates were identical. Our study highlights the importance of P. anomala as an emerging nosocomial fungal pathogen. 相似文献
8.
Meningiomas are not often aspirated unless they erode the skull, occur intraorbitally, or present as swelling in the head and neck region. We describe the cytologic findings of fine-needle aspiration cytology (FNAC) in four cases of meningioma that presented with swellings in the head and neck region. The patients underwent surgery, and the diagnosis of meningioma was confirmed. Three of the four cases were reported as aggressive meningiomas on histopathology. 相似文献
9.
10.
Knowledge-based computer system to aid in the histopathological diagnosis of breast disease. 下载免费PDF全文
A knowledge-based computer system, designed to assist pathologists in the histological diagnosis of breast disease, is described. This system represents knowledge in the form of "disease profiles" and uses a novel inference model based on the mathematical technique of hypergraphs. Its design overcomes many of the limitations of existing expert system technologies when applied to breast disease. In particular, the system can quickly focus on a differential problem and thus reduce the amount of data necessary to reach a conclusion. The system was tested on two sets of samples, consisting of 14 retrospective cases and five hypothetical cases of breast disease. Its recommendations were judged "correct" by the evaluating pathologist in 15 cases. This study shows the feasibility of providing "decision support" in histopathology. 相似文献