全文获取类型
收费全文 | 8609篇 |
免费 | 448篇 |
国内免费 | 22篇 |
专业分类
耳鼻咽喉 | 108篇 |
儿科学 | 745篇 |
妇产科学 | 379篇 |
基础医学 | 921篇 |
口腔科学 | 144篇 |
临床医学 | 415篇 |
内科学 | 1594篇 |
皮肤病学 | 153篇 |
神经病学 | 300篇 |
特种医学 | 197篇 |
外科学 | 1730篇 |
综合类 | 261篇 |
一般理论 | 2篇 |
预防医学 | 340篇 |
眼科学 | 568篇 |
药学 | 446篇 |
中国医学 | 22篇 |
肿瘤学 | 754篇 |
出版年
2023年 | 63篇 |
2022年 | 148篇 |
2021年 | 277篇 |
2020年 | 135篇 |
2019年 | 189篇 |
2018年 | 274篇 |
2017年 | 188篇 |
2016年 | 242篇 |
2015年 | 213篇 |
2014年 | 309篇 |
2013年 | 360篇 |
2012年 | 529篇 |
2011年 | 540篇 |
2010年 | 350篇 |
2009年 | 261篇 |
2008年 | 443篇 |
2007年 | 491篇 |
2006年 | 453篇 |
2005年 | 371篇 |
2004年 | 293篇 |
2003年 | 295篇 |
2002年 | 246篇 |
2001年 | 219篇 |
2000年 | 217篇 |
1999年 | 194篇 |
1998年 | 87篇 |
1997年 | 56篇 |
1996年 | 46篇 |
1995年 | 42篇 |
1992年 | 94篇 |
1991年 | 97篇 |
1990年 | 71篇 |
1989年 | 70篇 |
1988年 | 71篇 |
1987年 | 74篇 |
1986年 | 81篇 |
1985年 | 104篇 |
1984年 | 55篇 |
1983年 | 56篇 |
1982年 | 39篇 |
1981年 | 35篇 |
1980年 | 34篇 |
1979年 | 80篇 |
1978年 | 45篇 |
1977年 | 47篇 |
1976年 | 39篇 |
1975年 | 35篇 |
1974年 | 42篇 |
1973年 | 48篇 |
1972年 | 46篇 |
排序方式: 共有9079条查询结果,搜索用时 15 毫秒
91.
92.
The lateral pectoral flap 总被引:2,自引:0,他引:2
The lateral pectoral flap is a new pedicled flap based on the superficial thoracic artery which arises from the subscapular artery and courses along the lateral border of pectoralis major. The flap consists of skin, subcutaneous tissue and the underlying pectoral epimysium. It has been used successfully to resurface contralateral soft tissue defects over the fingers, thumb and dorsum of the hand in eight cases. The advantages of this flap are that it provides reliable soft tissue cover to the hand, which can be kept in an elevated position resting comfortably on the contralateral pectoral region with the forearm and arm aligned conveniently in the cross-chest position. It does not interfere with clothing and dressing the lower part of the body in contrast to the groin, hypogastric or lower abdominal flaps, and it allows early ambulation. Primary closure of the donor site in the majority of cases is an added benefit. 相似文献
93.
Serum and tissue lycopene and biomarkers of oxidation in prostate cancer patients: a case-control study. 总被引:4,自引:0,他引:4
Dietary intake of tomatoes and tomato products containing lycopene, an antioxidant carotenoid, has been shown in recent studies to reduce the risk of cancer. This study was conducted to investigate the serum and prostate tissue lycopene and other major carotenoid concentrations in cancer patients and their controls. Serum lipid and protein oxidation was also measured. Twelve prostate cancer patients and 12 age-matched subjects were used in the study. Significantly lower serum and tissue lycopene levels (44%, p = 0.04; 78%, p = 0.050, respectively) were observed in the cancer patients than in their controls. Serum and tissue beta-carotene and other major carotenoids did not differ between the two groups (p = 0.395 and p = 0.280, respectively). Although there was no difference (p = 0.760) in serum lipid peroxidation between cancer patients and their controls (7.09 +/- 0.74 and 6.81 +/- 0.56 mumol/l, respectively), serum protein thiol levels were significantly lower among the cancer patients (p = 0.026). This study demonstrates that the status of lycopene but not other carotenoids in prostate cancer patients is different from controls. The role of dietary lycopene in preventing oxidative damage of biomolecules and thereby reducing the risk of prostate cancer needs to be evaluated in future studies. 相似文献
94.
95.
96.
Purpose
We determined if separation of spermatozoa (washed) on a discontinuous colloidal suspension of silica (Percoll†) density gradient before cryopreservation improves post-thaw motility compared to an unprocessed (raw) cryopreserved sample.Materials and Methods
Ten normal healthy volunteers recruited into the andrology laboratory donor program were studied. Raw and washed cryopreserved spermatozoa were compared for loss of motility with time, motion characteristics, viability and membrane integrity after incubation for 1, 6 and 24 hours. Within group comparisons were made to baseline measurements (0 hours before incubation).Results
Raw and washed cryopreserved spermatozoa showed statistically significant decreases in motility and other motion characteristics after thawing. There were significant decreases in motility and other motion characteristics after incubation periods of 1, 6 and 24 hours, and significant decreases in viability and membrane integrity at 6 and 24 hours in the unprocessed spermatozoa. Although, motility and motion characteristics of washed samples decreased significantly with longer incubation periods, loss of motility with time (longevity) was greater in raw samples. Washed samples retained greater sperm motility for up to 24 hours (p less than 0.03).Conclusions
Specimens prepared by Percoll separation techniques before freezing offer the possibility of selecting spermatozoa that retain motility for up to 24 hours. This finding can be of benefit for couples undergoing intrauterine insemination to achieve pregnancy. 相似文献97.
H C Samant M K Agarwal O P Gupta S Khanna 《The Journal of laryngology and otology》1980,94(5):545-548
A rare case of fibrous dysplasia involving the mastoid bone is reported. Its histopathological characteristics are also described. 相似文献
98.
The distribution pattern of the alkaloids of A. Vasica has been studied with change of season. The study also resulted in the detection of glycosides and N-oxides of vasicine and vasicinone. 相似文献
99.
D. K. Singh R. A. Agarwal 《Archives of environmental contamination and toxicology》1983,12(4):483-487
The synergistic effects of piperonyl butoxide (PB)2, sulfoxide (SU), and dimethyl amino aniline (DAA) used in conjunction with two organophosphate pesticides (phorate and formothion) and two carbamate pesticides (mexacarbate and carbaryl) were examined in terms of the LC50 and acetylcholinesterase (AChE) inhibition in the snailLymnaea acuminata. The three synergists reduced the LC50 of phorate, formothion, mexacarbate, and carbaryl at exposure periods ranging from 24 to 144 hr. PB and SU had strong synergistic action; DAA had little effect; the highest synergistic ratio (70) was found with carbaryl and PB. The synergists enhanced thein vitro inhibition of cholinesterase caused by the pesticides; the synergistic effect onin vitro inhibition, however, was lower, compared to the change in the LC50. 相似文献
100.
Kochar DK Kumawat BL Agarwal N Shubharakaran Aseri S Sharma BV Rastogi A 《Neurology India》2000,48(2):170-173
Human brucellosis, more specifically neurobrucellosis, is a less commonly reported disease in India; although, animal brucellosis and seroprevalence in specific areas is well reported. We are reporting 4 cases of neurobrucellosis presenting as meningoencephalitis. Diagnosis was confirmed by serological test and agglutination titre was > 1:320 in all the patients. All these patients had close contact with animals and history of raw milk ingestion was present in 3 cases. The aim of presenting these cases is to create awareness among physicians while treating meningitis in persons, engaged in occupations related to brucellosis or having a history of ingestion of raw milk or milk product. 相似文献