全文获取类型
收费全文 | 3239篇 |
免费 | 191篇 |
国内免费 | 10篇 |
专业分类
耳鼻咽喉 | 30篇 |
儿科学 | 112篇 |
妇产科学 | 103篇 |
基础医学 | 328篇 |
口腔科学 | 59篇 |
临床医学 | 234篇 |
内科学 | 746篇 |
皮肤病学 | 92篇 |
神经病学 | 369篇 |
特种医学 | 293篇 |
外国民族医学 | 2篇 |
外科学 | 391篇 |
综合类 | 43篇 |
预防医学 | 205篇 |
眼科学 | 27篇 |
药学 | 201篇 |
中国医学 | 4篇 |
肿瘤学 | 201篇 |
出版年
2023年 | 13篇 |
2022年 | 18篇 |
2021年 | 34篇 |
2020年 | 28篇 |
2019年 | 50篇 |
2018年 | 61篇 |
2017年 | 65篇 |
2016年 | 68篇 |
2015年 | 74篇 |
2014年 | 76篇 |
2013年 | 118篇 |
2012年 | 168篇 |
2011年 | 171篇 |
2010年 | 128篇 |
2009年 | 132篇 |
2008年 | 161篇 |
2007年 | 137篇 |
2006年 | 152篇 |
2005年 | 132篇 |
2004年 | 131篇 |
2003年 | 102篇 |
2002年 | 104篇 |
2001年 | 106篇 |
2000年 | 99篇 |
1999年 | 86篇 |
1998年 | 75篇 |
1997年 | 82篇 |
1996年 | 78篇 |
1995年 | 56篇 |
1994年 | 52篇 |
1993年 | 44篇 |
1992年 | 34篇 |
1991年 | 41篇 |
1990年 | 51篇 |
1989年 | 40篇 |
1988年 | 52篇 |
1987年 | 55篇 |
1986年 | 61篇 |
1985年 | 46篇 |
1984年 | 21篇 |
1983年 | 27篇 |
1982年 | 23篇 |
1980年 | 16篇 |
1979年 | 19篇 |
1978年 | 13篇 |
1976年 | 20篇 |
1973年 | 14篇 |
1972年 | 14篇 |
1971年 | 11篇 |
1967年 | 10篇 |
排序方式: 共有3440条查询结果,搜索用时 0 毫秒
1.
2.
3.
4.
5.
Carlos Sala M.D. Eduardo García-Granero M.D. Ph.D. María J. Molina M.D. Jose V. García M.D. Salvador Lledo M.D. Ph.D. 《Diseases of the colon and rectum》1997,40(8):958-961
PURPOSE: Epidural anesthesia is believed to benefit colorectal anastomotic blood flow because of the sympathetic blockade it produces. Our purpose is to measure with tonometry the effect of epidural anesthesia on colorectal anastomotic oxygenation. PATIENTS AND METHODS: Fifteen patients operated on for rectal cancer (radical anterior resection) were monitored postoperatively using tonometers placed in the stomach (celiac trunk), transverse colon (superior mesenteric artery), and the anastomotic area during the operation. An epidural catheter was placed at L1-2, and on the first postoperative day, 8 ml of bupivacaine (0.25 percent) was administered. The anesthetic effect extended up to T-4. Intramucosal pH (pHi) at the three locations was measured before, during, and after the epidural blockade. RESULTS: Gastric and transverse colon pHi increased during the epidural blockade from 7.35±0.01 to 7.41±0.01 and from 7.34±0.02 to 7.40±0.02, respectively. The anastomotic pHi decreased from 7.3±0.02 to 7.24±0.03 under the epidural and increased up to 7.34±0.02 after withdrawal of the effect on the following day. All pHi variations were statistically significant (P<0.05, paired Student'st-test and Wilcoxon's test), because it was the comparison between gastric and transverse colon pHi with the anastomotic pHi during the epidural (P<0.05, one-way analysis of variance and Kruskal-Wallis tests). None of the patients developed anastomotic or other complications. CONCLUSIONS: Epidural anesthesia with bupivacaine causes a significant decrease in the oxygenation-perfusion state of colorectal anastomosis in comparison with the increase in other areas of the digestive tract. Further studies need to be done to see if other epidural anesthetic-analgesic protocols also worsen colorectal anastomotic blood flow.Supported in part by a grant from the Spanish Society of Digestive Diseases, Madrid, Spain. All tonometric catheters and drugs were donated by the Clinic University Hospital of Valencia, Spain.Read at the meeting of The American Society of Colon and Rectal Surgeons, Seattle, Washington, June 9 to 14, 1996. 相似文献
6.
7.
8.
E Capitani S Della Sala R H Logie H Spinnler 《Cortex; a journal devoted to the study of the nervous system and behavior》1992,28(3):315-342
In this paper we consider the serial position curve in immediate verbal free recall. A large literature has argued that two components of the serial position curve, recency and primacy, reflect the functioning respectively of short-term and of long-term memory. However, there are a number of difficulties in interpreting the recency effect as a phenomenon uniquely associated with short-term memory. Moreover, the serial position curve has been used widely for clinical investigations in patients with memory deficits. This is despite the lack of norms for the measures derived from the curve. We present a set of standardised norms based on 321 Italian normal subjects. These norms are shown to be applicable both to an English speaking population, and to three groups of brain damaged-patients, namely Alzheimer's, amnesics, and frontals. The standardised norms offer a clinical and experimental tool which, coupled with a multiple single case approach, allows us to show dissociations and double dissociations among the performance patterns obtained from all three pathological groups. The paper concludes with a discussion of a possible interpretation of the recency effect as a emergent property of all types of memory system, including verbal short-term memory. Taking into account previous literature as well as our own data, the recency effect in immediate verbal free recall is here interpreted in terms of a two-component view of verbal short-term memory. 相似文献
9.
F. Ostanello M. Dottori C. Gusmara G. Leotti V. Sala 《Transboundary and Emerging Diseases》2007,54(2):70-75
The aims of this study were the evaluation of a quantitative method for the assessment of pneumonia lesions applied to heavy‐weight slaughtered pigs, the identification of risk factors connected with the increase in the prevalence and severity of the lesions and the evaluation of a possible correlation between the presence of pneumonia lesions and the decrease in the carcass quality. The lungs of 10 041 pigs (109 slaughtered batches) coming from 91 farms located in Northern Italy were examined. Lung lesions were scored using the method developed by Madec and Kobisch (Journ. Rech. Porc. Fr., 14 , 1982 , 405). Before the scoring, anamnestic information regarding the farm of origin of each batch were collected. For 41 batches (3603 pigs), information about carcass quality were also collected. Pneumonia lesions were found in 59.6% of the lungs (range 3–91%), and the average batch score was 2.11 (range 0.03–7.15). We identified as farm risk factors those related to an increase in the severity of the lung lesions, the presence of breeders within the herd, the starting of a growing cycle during the winter season and the lack of vaccination programmes to Mycoplasma hyopneumoniae. Moreover, we also found a statistically significant association between the increase in the mean lung score of the batch and the decrease of the carcass quality. 相似文献
10.
S. van Ruth† EBL van Dorst‡ MR Canninga-van Dijk§ MS de Bruin-Weller† 《Journal of the European Academy of Dermatology and Venereology》2007,21(5):678-680
Cutaneous metastasis of vaginal carcinoma is extremely rare. So far, the total number of reported skin metastasis of vaginal carcinoma is only one. We present another case with an unusual manifestation of vagina carcinoma metastasis: skin metastasis presenting as a leg ulcer on the lower leg. 相似文献