全文获取类型
收费全文 | 10492篇 |
免费 | 649篇 |
国内免费 | 78篇 |
专业分类
耳鼻咽喉 | 96篇 |
儿科学 | 369篇 |
妇产科学 | 160篇 |
基础医学 | 1153篇 |
口腔科学 | 357篇 |
临床医学 | 720篇 |
内科学 | 2416篇 |
皮肤病学 | 235篇 |
神经病学 | 504篇 |
特种医学 | 433篇 |
外科学 | 1381篇 |
综合类 | 267篇 |
一般理论 | 5篇 |
预防医学 | 588篇 |
眼科学 | 494篇 |
药学 | 1004篇 |
中国医学 | 51篇 |
肿瘤学 | 986篇 |
出版年
2023年 | 55篇 |
2022年 | 130篇 |
2021年 | 256篇 |
2020年 | 138篇 |
2019年 | 188篇 |
2018年 | 251篇 |
2017年 | 164篇 |
2016年 | 197篇 |
2015年 | 255篇 |
2014年 | 331篇 |
2013年 | 422篇 |
2012年 | 624篇 |
2011年 | 662篇 |
2010年 | 330篇 |
2009年 | 339篇 |
2008年 | 476篇 |
2007年 | 510篇 |
2006年 | 514篇 |
2005年 | 458篇 |
2004年 | 420篇 |
2003年 | 397篇 |
2002年 | 362篇 |
2001年 | 299篇 |
2000年 | 314篇 |
1999年 | 232篇 |
1998年 | 136篇 |
1997年 | 90篇 |
1996年 | 87篇 |
1995年 | 87篇 |
1994年 | 63篇 |
1993年 | 64篇 |
1992年 | 158篇 |
1991年 | 170篇 |
1990年 | 163篇 |
1989年 | 152篇 |
1988年 | 153篇 |
1987年 | 176篇 |
1986年 | 148篇 |
1985年 | 115篇 |
1984年 | 122篇 |
1983年 | 90篇 |
1982年 | 58篇 |
1980年 | 56篇 |
1979年 | 67篇 |
1977年 | 59篇 |
1976年 | 60篇 |
1975年 | 64篇 |
1974年 | 81篇 |
1973年 | 65篇 |
1972年 | 55篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
21.
Prasanna Kumar Reddy R Venkata Subramanian S Yuvaraja 《JSLS, Journal of the Society of Laparoendoscopic Surgeons》2005,9(3):356-357
Transposition of the gallbladder to the left side without situs inversus viscerum is rare. These gallbladders are situated under the left lobe of the liver between Segment III and IV or on Segment III to the left of the falciform ligament. Because routine preoperative studies may not detect the anomaly, it may provide the surgeons with an unusual surprise during laparoscopy. Awareness of the unpredictable confluence of the cystic duct into the common bile duct and selective use of intraoperative cholangiography aid in the safe laparoscopic management of this unusual problem. 相似文献
22.
The effect of low dose lofepramine in depressed elderly patients in general medical wards.
下载免费PDF全文
![点击此处可从《British journal of clinical pharmacology》网站下载免费的PDF全文](/ch/ext_images/free.gif)
R S Tan R J Barlow C Abel S Reddy A J Palmer A E Fletcher C G Nicholl B M Pitt C J Bulpitt 《British journal of clinical pharmacology》1994,37(4):321-324
A double-blind randomised controlled trial of the effect of low dose lofepramine (70 mg once daily) against placebo was carried out on depressed elderly inpatients on general medical wards for the elderly, comparing measures of depression and side-effects between the randomised groups. Patients were identified for the study using the Geriatric Depression Scale (GDS) and the Brief Assessment Schedule Depression Cards (BASDEC). Sixty-three subjects were randomised: 46 patients completed the entire trial of 28 days treatment. BASDEC and GDS were administered on day 8 post-admission, and depressed patients were randomised double-blind to either low dose lofepramine (70 mg daily) (n = 23) or placebo (n = 23). Assessment of changes in depressive states were made using the Montgomery Asberg Depression Rating Scale (MADRS) on days 8, 18 and 36 post-admission. Both groups improved by a similar amount during the trial. Lofepramine tended to be more effective than placebo in those patients who were more depressed (GDS > or = 18). On the other hand, subjects who were less depressed (i.e. GDS < 18) improved more on placebo than lofepramine. Low dose lofepramine may prove useful in moderately or severely depressed patients treated for only 4 weeks. However, low dose lofepramine is not indicated for mild (GDS 15-18) depression. 相似文献
23.
Sajja Lokeswara Rao Mannam Gopichand Sompali Sriramulu Reddy Karri Venkata Ravirala Bala Raju Raju Bhupathiraju Soma Raju Penmetcha Krishnam 《Indian Journal of Thoracic and Cardiovascular Surgery》2004,20(4):173-177
Background Cardiopulmonary bypass (CPB) may contribute to the complications and it is assumed that eliminating cardiopulmonary bypass
has the potential of reducing post operative morbidity after coronary artery bypass grafting (CABG). The study was carried
out to compare mortality and morbidity in the off-pump and on-pump CABG groups.
Methods We prospectively analysed 200 patients undergoing CABG. Group A consists of 100 patients underwent multi-vessel off-pump CABG
and group B consists of 100 patients underwent CABG with CPB. The incidence of complications (mortality, re-exploration for
bleeding, myocardial infarction, atrial fibrillation, neurological events, new onset renal failure (s. creatinine>1.6 mg/dL)
pulmonary complications, length of ICU stay and hospital stay were recorded, analysed and compared.
Results OPCAB patients received 2.73±0.61 grafts/patient and on-pump CABG patients received 3.39±0.75 grafts/patient (p value<0.00001). There was no significant statistical difference in mortality, incidence of stroke between OPCAB and CABG
with CPB patients. Length of ICU stay was 32.84±4.22 vs 44.85±7.18 hrs (p value<0.00001) and hospital stay was 6.52±0.69 vs 7.94±0.92 days (p value<0.00001) between group A and group B respectively. Incidence of atrial fibrillation was less in OPCAB group 7% vs 12%
although it was statistically not significant (p value 0.33). It was observed in our study that there was no significant deference in worsening of existing renal failure
between on-pump CABG and OPCAB 6% vs 2% (P value 0.28). Blood utilization was significantly less in OPCAB group (p value<0.001).
Conclusion There was no statistically significant difference in terms of mortality, incidence of stroke and new onset renal failure in
both groups. But there was lesser incidence of post operative atrial fibrillation, worsening of existing renal failure in
off-pump group though statistically not significant. There was significant reduction in blood utilization, length of ICU and
hospital stay in OPCAB group. 相似文献
24.
25.
Effects of risk-associated human dietary macrocomponents on processes related to carcinogenesis in human-flora-associated (HFA) rats 总被引:3,自引:2,他引:1
Rumney C.J.; Rowland I.R.; Coutts T.M.; Randerath K.; Reddy R.; Shah A.B.; Ellul A.; O'Neill I.K. 《Carcinogenesis》1993,14(1):79-84
Dietary fat, beef protein and fibre have been shown to modulatecancer risk in humans and the present study examined the biologicaleffects in human-flora-associated (HFA) rats of altering intakelevels within the normal human range. Two control groups, oneHFA and the other germfree (GF), consumed a human diet low infat, fibre and beef for 4 weeks; three other groups consumedhuman diets similar except for independent 3-fold increasesin fat, beef protein or fibre. After 2 weeks on the diets, magneticallyrecoverable microcapsules were given orally to the rats andsubsequently recovered from the faeces to assess endogenouscross-linking agents. After 4 weeks, measurements were madeof gut microfloral enzyme activities, hepatic activation ofdietary mutagens and hepatic DNA adducts by 32P-postlabelling.Activation in vitro of the dietary mutagens 2-amino-3-methyl-3H-imidazo[4,5-f]quinolline (IQ) and 2-amino-l-methyl-6- phenytimidazo[4,5-b]pyridine(PhIP) by hepatic S9, formation of endogenous hepatic DNA adductsin vivo and the ß-glucuronidase activity of caecalcontents were all increased in the sequence high fat > highfibre > high beef = control. Of the two DNA adducts foundin all HFA rats, only one was present in GF controls, indicatingthat the human gut microflora (subject to human dietary modulation)either releases a DNA-adducting product able to act outsidethe gastrointestinal tract, or stimulates the generation ofsuch a product by mammalian processes. Caecal nitrate reductaseactivity was highest in rats fed the high beef diet, whilstentrapment of cross-linking agents was highest in those fedthe high fibre diet. These results show that risk-related componentsof human diets interact with human gut microflora to modulatethe production of endogenous DNA-adducting and cross-linkingsubstances. 相似文献
26.
27.
J Rajeev Shoba Srinath Y C J Reddy M G Shashikiran Satish Chandra Girimaji Shekhar P Seshadri D K Subbakrishna 《Revue canadienne de psychiatrie》2003,48(1):52-55
OBJECTIVE: Recent studies of patients with juvenile bipolar disorder report low rates of recovery and high rates of chronicity. However, we lack data on the short-term outcome. This study examines the pattern of recovery from the index episode in an aggressively treated juvenile sample. METHOD: We assessed 25 subjects (< 16 years) with a diagnosis of mania, using the Diagnostic Interview for Children and Adolescents-Revised) (DICA-R), Young Mania Rating Scale (YMRS), and Children's Global Assessment Scale (CGAS) at intake and at 3 and 6 months. We studied the time taken to recover from the index episode, the level of functioning, and the factors predicting them. RESULTS: After 6 months, 24 (96%) subjects had recovered from the index manic episode. The median time to recovery was 27 days. Total episode length was significantly longer among those with previous affective episodes. CONCLUSIONS: The findings suggest that juvenile-onset mania has high rates of recovery and low rates of chronicity. These differences from the existing literature need further exploration. 相似文献
28.
Evidence has been accumulating regarding the importance of biological rhythms in the diagnosis and treatment of a variety of diseases and disorders. Increasingly, the arthritides have shown statistically quantifiable rhythmic parameters. Included in the latter group are joint pain and joint size. In addition, a number of drugs used to treat rheumatic diseases have varying therapeutic and toxic effects based on the time of day of administration. Among these drug classes are nonsteroidal antiinflammatory drugs, glucocorticoids, and a number of cytostatic agents. In the last group of agents, experience in treating malignant disease suggests that time-specified treatment may reduce the toxic effects of low-dose cytostatic treatment of rheumatoid arthritis (RA) and related diseases. This article reviews that evidence and suggests a rationale for the timed treatment of RA with methotrexate. 相似文献
29.
30.
M S Pinzur F Littooy J Daniels C Arney N K Reddy G Graham H Osterman 《Clinical orthopaedics and related research》1992,(281):239-243
During a three-year period, 95 adults were treated by lower-extremity amputations for peripheral vascular insufficiency. A multidisciplinary team for presurgical evaluation determined all to be potentially independent walkers with a prosthesis. Patients were graded for level of independent walking before amputation and again at a minimum two-year follow-up examination using a seven-level functional grading system. Seventy-six of 90 patients (84%) ambulated within one functional level of their preamputation status. This return to preamputation level of function was maintained whether comparing preamputation functional level or surgical amputation level. Prosthetic use increased and the use of walking aids decreased with increased functional ambulation levels, but did not correlate with surgical levels. Peripheral vascular insufficiency patients can maintain walking independence. Multidisciplinary presurgical evaluation helps selection of the amputation level and correct prosthetic limb fitting. 相似文献