全文获取类型
收费全文 | 124246篇 |
免费 | 8460篇 |
国内免费 | 449篇 |
专业分类
耳鼻咽喉 | 1631篇 |
儿科学 | 3293篇 |
妇产科学 | 2071篇 |
基础医学 | 15984篇 |
口腔科学 | 2368篇 |
临床医学 | 12528篇 |
内科学 | 26280篇 |
皮肤病学 | 1915篇 |
神经病学 | 11951篇 |
特种医学 | 4290篇 |
外国民族医学 | 4篇 |
外科学 | 17996篇 |
综合类 | 1882篇 |
现状与发展 | 1篇 |
一般理论 | 167篇 |
预防医学 | 11088篇 |
眼科学 | 2908篇 |
药学 | 8694篇 |
2篇 | |
中国医学 | 172篇 |
肿瘤学 | 7930篇 |
出版年
2023年 | 470篇 |
2022年 | 696篇 |
2021年 | 2069篇 |
2020年 | 1228篇 |
2019年 | 2013篇 |
2018年 | 2318篇 |
2017年 | 1788篇 |
2016年 | 1958篇 |
2015年 | 2416篇 |
2014年 | 3442篇 |
2013年 | 5336篇 |
2012年 | 7764篇 |
2011年 | 8285篇 |
2010年 | 4690篇 |
2009年 | 4511篇 |
2008年 | 7972篇 |
2007年 | 8518篇 |
2006年 | 8356篇 |
2005年 | 8639篇 |
2004年 | 8171篇 |
2003年 | 8004篇 |
2002年 | 7573篇 |
2001年 | 1183篇 |
2000年 | 940篇 |
1999年 | 1235篇 |
1998年 | 1703篇 |
1997年 | 1426篇 |
1996年 | 1162篇 |
1995年 | 1150篇 |
1994年 | 943篇 |
1993年 | 961篇 |
1992年 | 755篇 |
1991年 | 706篇 |
1990年 | 671篇 |
1989年 | 625篇 |
1988年 | 575篇 |
1987年 | 543篇 |
1986年 | 544篇 |
1985年 | 662篇 |
1984年 | 832篇 |
1983年 | 830篇 |
1982年 | 1162篇 |
1981年 | 1052篇 |
1980年 | 950篇 |
1979年 | 464篇 |
1978年 | 575篇 |
1977年 | 547篇 |
1976年 | 449篇 |
1975年 | 408篇 |
1974年 | 365篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
111.
112.
113.
J. Richard Hanley Lyndsey Nickels 《Cortex; a journal devoted to the study of the nervous system and behavior》2009,45(6):784-790
In this paper, we investigate the claim that although the same lexical units are involved in speech production and comprehension, there are separate input and output phoneme layers (Foygel and Dell, 2000). Data from a case series of aphasic patients are used to test this claim by examining the relationship between performance on a test of picture naming and performance on tests of phonological input. Estimates of each patient's semantic-lexical and phonological impairments in speech production were derived from Foygel and Dell's computational model of picture naming. It was found that the strength of the semantic-lexical impairments in speech production was significantly correlated with performance on auditory comprehension tests. This finding is consistent with the claim that the same lexical units are involved in speech comprehension and production. Conversely, the correlations between the strength of the phonological lesions in speech production and performance on tests of phonological input were non-significant, consistent with Foygel and Dell's claim that there are distinct input and output phoneme layers. 相似文献
114.
115.
116.
Timothy M. Pawlik Kelly Olino Ana Luiza Gleisner Michael Torbenson Richard Schulick Michael A. Choti 《Journal of gastrointestinal surgery》2007,11(7):860-868
Some investigators have suggested that preoperative chemotherapy for hepatic colorectal metastases may cause hepatic injury
and increase perioperative morbidity and mortality. The objective of the current study was to examine whether treatment with
preoperative chemotherapy was associated with hepatic injury of the nontumorous liver and whether such injury, if present,
was associated with increased morbidity or mortality after hepatic resection. Two-hundred and twelve eligible patients who
underwent hepatic resection for colorectal liver metastases between January 1999 and December 2005 were identified. Data on
demographics, clinicopathologic characteristics, and preoperative chemotherapy details were collected and analyzed. The majority
of patients received preoperative chemotherapy (n = 153; 72.2%). Chemotherapy consisted of fluoropyrimidine-based regimens: 5-FU monotherapy, 31.6%; irinotecan, 25.9%; and
oxaliplatin, 14.6%. Among those patients who received chemotherapy, the type of chemotherapy regimen predicted distinct patterns
of liver injury. Oxaliplatin was associated with increased likelihood of grade 3 sinusoidal dilatation (p = 0.017). Steatosis >30% was associated with irinotecan (27.3%) compared with no chemotherapy, 5-FU monotherapy, and oxaliplatin
(all p < 0.05). Irinotecan also was associated with steatohepatitis, as two of the three patients with steatohepatitis had received
irinotecan preoperatively. Overall, the perioperative complication rate was similar between the no-chemotherapy group (30.5%)
and the chemotherapy group (35.3%) (p = 0.79). Preoperative chemotherapy was also not associated with 60-day mortality. In patients with hepatic colorectal metastases,
preoperative chemotherapy is associated with hepatic injury in about 20 to 30% of patients. Furthermore, the type of hepatic
injury after preoperative chemotherapy was regimen-specific.
Presented at the American Hepato-Pancreato-Biliary Association 2006 Annual Meeting, March 11, Miami, Florida. 相似文献
117.
118.
Aaron M Kipp Jennifer A Lehman Richard A Bowen Patricia E Fox Michael R Stephens Kaci Klenk Nicholas Komar Michel L Bunning 《The American journal of tropical medicine and hygiene》2006,75(4):688-690
To better understand the potential environmental health risk presented by West Nile virus (WNV)-contaminated feces, we quantified the amount of WNV present in the feces of experimentally infected American crows (Corvus brachyrhynchos) and fish crows (Corvus ossifragus). Peak fecal titers ranged from 10(3.5) to 10(8.8) plaque-forming units (PFU)/g for 10 American crows and from 10(2.3) to 10(6.4) PFU/g for 10 fish crows. The presence of infectious WNV in bird feces indicates a potential for direct transmission of WNV. Thus, handlers of sick or dead birds should take appropriate precautions to avoid exposure to fecal material. 相似文献
119.
120.
Frank Buntinx Richard Wachana Stefaan Bartholomeeusen Kathleen Sweldens Helena Geys 《The British journal of general practice》2005,55(511):102-107
BACKGROUND: It has been suggested that herpes zoster may be a marker for occult malignancy. AIM: To examine the emergence of a subsequent cancer diagnosis in patients with and without herpes zoster. DESIGN OF STUDY: Retrospective cohort study. SETTING: Results were based on the database of Intego, an ongoing Belgian general practice-based morbidity registry, covering 37 general practitioners and including about 311 000 patient years between the years 1994 and 2000. METHOD: Survival analysis comparing the emergence of malignancy in patients with and without herpes zoster. RESULTS: The number of patients below the age of 65 years with herpes zoster, cancer or both was too low to draw any sensible conclusions. Above the age of 65 years we identified a significant increase of cancer emergence in the whole group and in females (hazard ratio = 2.65, 95% confidence interval = 1.43 to 4.90), but not in males. No difference could be identified in the first year after the herpes zoster infection. CONCLUSION: Our results do not justify extensive testing for cancer in herpes zoster patients. The association we identified, however, leaves open a number of questions with respect to the physiopathology behind it. 相似文献