全文获取类型
收费全文 | 766篇 |
免费 | 50篇 |
国内免费 | 6篇 |
专业分类
耳鼻咽喉 | 27篇 |
儿科学 | 14篇 |
妇产科学 | 22篇 |
基础医学 | 77篇 |
口腔科学 | 3篇 |
临床医学 | 107篇 |
内科学 | 156篇 |
皮肤病学 | 2篇 |
神经病学 | 23篇 |
特种医学 | 28篇 |
外科学 | 81篇 |
综合类 | 70篇 |
一般理论 | 2篇 |
预防医学 | 96篇 |
眼科学 | 14篇 |
药学 | 38篇 |
中国医学 | 13篇 |
肿瘤学 | 49篇 |
出版年
2023年 | 5篇 |
2022年 | 8篇 |
2021年 | 12篇 |
2020年 | 7篇 |
2018年 | 8篇 |
2017年 | 7篇 |
2016年 | 8篇 |
2014年 | 16篇 |
2013年 | 11篇 |
2012年 | 33篇 |
2011年 | 36篇 |
2010年 | 17篇 |
2009年 | 19篇 |
2008年 | 34篇 |
2007年 | 35篇 |
2006年 | 25篇 |
2005年 | 22篇 |
2004年 | 44篇 |
2003年 | 41篇 |
2002年 | 38篇 |
2001年 | 27篇 |
2000年 | 16篇 |
1999年 | 22篇 |
1998年 | 14篇 |
1997年 | 7篇 |
1996年 | 5篇 |
1995年 | 9篇 |
1994年 | 7篇 |
1992年 | 21篇 |
1991年 | 17篇 |
1990年 | 17篇 |
1989年 | 14篇 |
1988年 | 15篇 |
1987年 | 22篇 |
1986年 | 14篇 |
1985年 | 6篇 |
1984年 | 11篇 |
1983年 | 11篇 |
1982年 | 7篇 |
1979年 | 6篇 |
1978年 | 8篇 |
1975年 | 9篇 |
1972年 | 4篇 |
1969年 | 5篇 |
1945年 | 4篇 |
1934年 | 4篇 |
1933年 | 4篇 |
1932年 | 6篇 |
1930年 | 6篇 |
1929年 | 4篇 |
排序方式: 共有822条查询结果,搜索用时 12 毫秒
1.
Christine E. East Fung Yee Chan Shaun P. Brennecke James F. King Paul B. Colditz 《分娩》2006,33(2):101-109
Abstract: Background: Fetal pulse oximetry improves the assessment of fetal well‐being during labor. The objective of this study was to evaluate women's satisfaction with their experience with this additional technology. Methods: We surveyed women participating in the FOREMOST trial, a randomized controlled trial comparing the addition of fetal pulse oximetry (FPO) to conventional cardiotocograph (CTG) monitoring (intervention group), versus CTG‐only (control group), in the presence of nonreassuring fetal status during labor. Our survey evaluated 3 aspects of women's experience: labor, fetal monitoring, and participation in the research. The survey was administered within a few days of giving birth and repeated 3 months later. Results: No differences were found between the intervention and control groups for women's evaluations of their labor, fetal monitoring, research, or overall experiences when surveyed on both occasions. Within each study group, a small but statistically significant decline occurred in women's scores for their experience of labor and overall experience from the initial survey close to the time of giving birth, to 3 months later. The magnitude of differences in responses over time was similar for the both groups. Women were more satisfied after a spontaneous or assisted vaginal birth than after cesarean section. Length of time the research midwife was present had a significant positive effect on women's ratings of their experience several days after giving birth (p = 0.006), but no effect at 3 months. Conclusions: The addition of fetal pulse oximetry for the assessment of fetal well‐being during labor did not affect childbearing women's perceptions of fetal monitoring or their labor. Women evaluated their experience in the research process positively overall. Small changes occurred in women's perception of their satisfaction over time. (BIRTH 33:2 June 2006) 相似文献
2.
3.
4.
Summary The coding sequences of the core proteins p17 and p28 of caprine arthritis-encephalitis virus (CAEV) were amplified using the polymerase chain reaction and cloned into the plasmid expression vector p-GEX-2T. Both p17 and p28 were expressed as fusion proteins with glutathione S-transferase. The recombinant proteins were affinity purified from induced bacterial lysates using glutathione-agarose beads. The purified proteins were used in an enzyme-linked immunosorbent assay (ELISA) to detect antibodies against CAEV in goat sera and milk samples. Three different ELISA tests were developed based on p17, p28 or the combination of these two recombinant proteins (p17+p28). A comparison was made to an ELISA based on purified whole virus particles and to agar immunodiffusion test (AGID). Sera with conflicting results in the different ELISA tests were examined by Western blotting. There was a high correlation between the ELISA tests based on p17+p28 recombinant proteins and whole virus ELISA, with an estimated value of 0.92. Only 72–75% of the sera that tested positive in these two ELISA tests were positive in AGID. Antibodies to CAEV were detected in significantly more animals when serum samples were tested compared to milk samples. Based on the time and materials required to prepare the reagents, the recombinant based ELISA test was less expensive than the whole virus ELISA. 相似文献
5.
The use of penetrometry for the assessment of materials employed for soft earmoulds is investigated. Selected test conditions are used for the characterisation of 10 materials of five types (cold-cured methacrylate, heat-cured methacrylate, heat-cured silicone, polyvinyl chloride co-polymer and polyethylene copolymer) used in clinical practice. The results are compared with the outcome of subjective assessments surveyed for four representative materials. The effect of ageing is assessed for a heat-cured silicone (Molloplast B) and a heat-cured methacrylate (Coe Super-Soft). 相似文献
6.
BACKGROUND. Four hundred thirty-three patients with recurrent breast cancer were treated by the authors at a large medical breast oncology facility from 1976-1982. The median survival time from first relapse (MSFR) for the 193 patients whose survival experience was not confounded by lead-time bias was 26 months. This MSFR is similar to that of most series published in the 1970s and 1980s and is approximately double that of series published in the 1960s. METHODS. In this series, regression analysis identified disease-free interval (DFI), estrogen receptor (ER) status, and dominant disease site as significant prognostic variables, similar to other published series. RESULTS. In 113 patients with known ER values, DFI, and dominant metastatic sites, a prognostic spectrum of MSFR patterns was identified among combinations of these three variables. The MSFR ranged from 15 months for poor risk patients with negative ER values, visceral dominant sites, and DFI of less than 24 months, to more than 90 months for good risk patients with positive ER values, soft tissue dominant sites, and DFI of more than 24 months. Although menopausal status alone was not a significant prognostic variable in regression analysis, 66% of premenopausal patients had a constellation of "poor" prognostic variables. CONCLUSIONS. This type of prognostic factor analysis at first relapse could help identify subsets of patients who might be considered for aggressive investigational therapies such as high-dose chemotherapy with autologous bone marrow reconstitution. 相似文献
7.
Homogenates and subcellular fractions of rat chorioallantoic placentas obtained on the 14th day of gestation were assayed for acyl-CoA: lysophospholipid acyltransferase activities using (14C)-linoleic acid, ATP, and CoA, or (14C)-oleoyl-CoA as acyl donor and 1-acylglycerophosphorylcholine or 1-acylglycerophosphorylethanolamine as acyl acceptor. We found that: (1) the Lands' deacylation-reacylation cycle is present in the rat placenta, (2) the enzymes were concentrated in the microsomal fraction, and (3) the optimal conditions for in vitro assay of those enzyme activities were similar to those reported for adult tissues. Comparison of the acyl composition of phospholipids in maternal blood with those in placental homogenates revealed similarities which are consistent with a role for this cycle in vivo in placental uptake of phospholipids. That this cycle may function also in placental transformation of phospholipids in vivo, is suggested by differences between the acyl composition of phospholipids in placental homogenates and microsomal fractions. 相似文献
8.
循经穴位推拿治疗肩周炎临床观察 总被引:1,自引:1,他引:1
根据肩周炎局部压痛点的经络所属,运用循经推拿治疗肩周炎88例(治疗组),并与常规推拿治疗肩周炎102例(对照组)比较,疗程为3周.结果两组的总有效率分别为100%、89.2%(P<0.05);复发率分别为12.5%、26.4%(P<0.05). 相似文献
9.
本文报导了在日立 M-80型气相色谱/质谱仪上装上CDS Pyroprobe 100型裂解器,组成既能做裂解色谱/质谱(Py-GC/MS),又能做裂解质谱(Py-MS)的分析裂解系统,通过对一系列的高分子裂解试验,评价了二者的性能。 相似文献
10.
Insufficiency risk of esophagojejunal anastomosis after total abdominal gastrectomy for gastric carcinoma 总被引:4,自引:0,他引:4
L.?MeyerEmail author F.?Meyer H.?Dralle M.?Ernst H.?Lippert I.?Gastinger East German Study Group for Quality Control in Operative Medicine Regional Development in Surgery 《Langenbeck's archives of surgery / Deutsche Gesellschaft fur Chirurgie》2005,390(6):510-516
Background The outcome and quality of surgical treatment in gastric cancer are closely associated with specific postoperative morbidity and mortality, in addition to an oncosurgically adequate resection status. In this context, a preventive concept of decreasing the insufficiency rate of esophageal anastomosis may have a great impact.Method Over a time period of 12 months (from 1 January 2002 to 31 December 2002), 1,199 patients (from 80 East German hospitals) with gastric carcinoma, carcinoma of the esophagogastral junction, or gastrointestinal stroma tumor (GIST) were enrolled in this prospective multicenter observational study with the aim of evaluating their early postoperative outcome. By means of a logistic regression analysis, independent variables, which alter significantly the healing of esophagojejunal anastomosis, were determined; in addition, their clinical impact on preventive management to lower the insufficiency rate of esophageal anastomosis was investigated.Results In 1,139 patients, histological investigation revealed gastric carcinoma. Out of these patients, 1,031 subjects underwent surgical intervention (90.5%) and 891 individuals underwent resection (86.4%). In 813 patients, radical resection (subtotal resection and gastrectomy) was executed (78.9%), whereas in 726 cases, R0 resection was achieved (81.5%). Gastrectomy was the preferred procedure in 649 patients, resulting in a gastrectomy rate of 62.9% relating to all patients who underwent operation (curative and palliative intention, 80.3% and 19.7%, respectively). The insufficiency rate of esophagojejunal anastomosis was 5.7% (37/649). Neither the comparison between the various procedures for the reconstruction of the esophagojejunal passage and anastomosing techniques after gastrectomy nor that between gastrectomies with curative and palliative intention revealed any significant difference. Dysphagia and gastric outlet syndrome due to a stenosis were determined as independent variables by a logistic regression analysis of all preoperative and intraoperative variables. In all patients with gastric carcinoma, both parameters were recorded in 9.9% (113/1,139) and 6.7% (76/1,139), respectively.Conclusion Dysphagia and gastric stenosis, which significantly influence the healing of esophagojejunal anastomosis after gastrectomy, are considered characteristics of an advanced tumor growth and a pretherapeutic lack of an adequate nutrition. This emphasizes the necessity of an early diagnosis of gastric cancer in order to lower perioperative morbidity. In addition, dysphagia is commonly associated with an obstruction of the upper gastrointestinal tract, which can lead to nutritional deficits, and thus deserves specific care during preventive management. 相似文献