全文获取类型
收费全文 | 263959篇 |
免费 | 13533篇 |
国内免费 | 2152篇 |
专业分类
耳鼻咽喉 | 3354篇 |
儿科学 | 7809篇 |
妇产科学 | 5203篇 |
基础医学 | 37598篇 |
口腔科学 | 5868篇 |
临床医学 | 22402篇 |
内科学 | 56619篇 |
皮肤病学 | 6632篇 |
神经病学 | 22837篇 |
特种医学 | 7848篇 |
外国民族医学 | 115篇 |
外科学 | 32214篇 |
综合类 | 4419篇 |
现状与发展 | 6篇 |
一般理论 | 72篇 |
预防医学 | 23982篇 |
眼科学 | 5197篇 |
药学 | 19195篇 |
13篇 | |
中国医学 | 1695篇 |
肿瘤学 | 16566篇 |
出版年
2023年 | 1668篇 |
2022年 | 1781篇 |
2021年 | 4734篇 |
2020年 | 3041篇 |
2019年 | 4834篇 |
2018年 | 8470篇 |
2017年 | 5767篇 |
2016年 | 5764篇 |
2015年 | 6673篇 |
2014年 | 7281篇 |
2013年 | 10652篇 |
2012年 | 18336篇 |
2011年 | 18346篇 |
2010年 | 9310篇 |
2009年 | 7104篇 |
2008年 | 15496篇 |
2007年 | 16383篇 |
2006年 | 15156篇 |
2005年 | 15082篇 |
2004年 | 13627篇 |
2003年 | 12463篇 |
2002年 | 11713篇 |
2001年 | 6645篇 |
2000年 | 6852篇 |
1999年 | 6199篇 |
1998年 | 1357篇 |
1997年 | 1210篇 |
1996年 | 1070篇 |
1995年 | 999篇 |
1994年 | 847篇 |
1992年 | 3465篇 |
1991年 | 3084篇 |
1990年 | 2923篇 |
1989年 | 2685篇 |
1988年 | 2523篇 |
1987年 | 2339篇 |
1986年 | 2197篇 |
1985年 | 2002篇 |
1984年 | 1433篇 |
1983年 | 1239篇 |
1979年 | 1213篇 |
1978年 | 850篇 |
1977年 | 796篇 |
1975年 | 801篇 |
1974年 | 987篇 |
1973年 | 997篇 |
1972年 | 936篇 |
1971年 | 922篇 |
1970年 | 861篇 |
1969年 | 905篇 |
排序方式: 共有10000条查询结果,搜索用时 8 毫秒
991.
992.
993.
The influence on glycosylated hemoglobin (HbA1) of formal education as compared with self-monitoring of blood glucose (SMBG) was studied in a randomized 18-month trial. All adult type I diabetics in a community were identified. Forty-one of these patients had had diabetes for 20 years or less. Thirty-seven patients were included in the study and finally randomized into four groups. Ten patients received individual formal education followed by SMBG, eight patients were instructed in SMBG without pre-education, nine patients were given only formal education and 10 patients made up a reference group. Education did not improve the mean HbA1 values. SMBG resulted in a decrease by 2% in HbA1, from 12 to 10% (p less than 0.05). The final HbA1 level, however, did not differ significantly between any of the groups. SMBG was accepted by 80% of the patients. The liability to hypoglycemia was about equal in the four groups. It was concluded that SMBG, but not education, improved metabolic control to a certain degree. 相似文献
994.
Miklos Degré Geir Bukholm Ellen E. Lund Gisle Djupesland 《Medical microbiology and immunology》1978,166(1-4):151-156
Herpes virus hominis type 1 was isolated from the trigeminal ganglion (ganglion semilunare, gasservian) in three out of 20 randomly selected autopsies. Two of the three patients had been treated with immunosuppressive or cytostatic agents. Clinical signs of herpes infection were not observed during the previous 6 months. No virus was isolated from the facial ganglion (geniculate ganglion) in the same 20 cases. The findings are discussed in relation to the viral etiology of acute peripheral facial palsy. 相似文献
995.
996.
High risk pregnancies in hypopituitary women 总被引:1,自引:0,他引:1
Overton CE Davis CJ West C Davies MC Conway GS 《Human reproduction (Oxford, England)》2002,17(6):1464-1467
BACKGROUND: Various short papers have suggested that pregnancies in women with hypopituitarism are high risk but no formal assessment of pregnancy outcome has yet been reported. METHODS: An audit was carried out concerning the outcome of 18 pregnancies in nine women who underwent ovulation induction in a single centre over 20 years. RESULTS: The live birth rate was 61%, miscarriage rate 28% and mid-trimester uterine death rate 11% with no survivors from four sets of twins. The Caesarian section rate was 100% and half of the live births were on or below the 10th centile for weight. One woman successfully breast-fed. CONCLUSIONS: Women with hypopituitarism have high-risk pregnancies, perhaps because of a uterine defect secondary to endocrine deficiency. Fertility treatment must strive for singleton pregnancies with application of particularly strict criteria to avoid twin pregnancies. Early elective Caesarian section is probably warranted in this group. 相似文献
997.
998.
Chapiro E Feldmann D Denoyelle F Sternberg D Jardel C Eliot MM Bouccara D Weil D Garabédian EN Couderc R Petit C Marlin S 《European journal of human genetics : EJHG》2002,10(12):851-856
Hearing impairment is the most frequent sensory defect in children, with a genetic basis in about 50% of cases. Several point mutations and deletions in mitochondrial DNA (mtDNA) have been identified in non-syndromic sensorineural hearing loss (NSSNHL). Beside the frequent A1555G mutation, a number of mutations in tRNAs have been reported recently, but their incidence remains unknown. We identified the T7511C mutation in the tRNASer(UCN) gene in two French families with isolated deafness. Maternal transmission was obvious in both. The 15 patients with hearing impairment exhibited a variable disease phenotype in terms of onset, severity, and progression. T7511C was present in all the patients screened. Homoplasmic and heteroplasmic levels were observed and did not correlate with the severity of the disease. T7511C was also present in 12 hearing offspring of the oldest deaf mothers, confirming the existence of modulatory factors. Our data suggest that this mtDNA mutation should be screened for in all cases of familial NSSNHL compatible with maternal transmission. 相似文献
999.
Origin and filiation of human plasmacytoid dendritic cells 总被引:8,自引:0,他引:8
Brière F Bendriss-Vermare N Delale T Burg S Corbet C Rissoan MC Chaperot L Plumas J Jacob MC Trinchieri G Bates EE 《Human immunology》2002,63(12):1081-1093
Human plasmacytoid dendritic cells represent a rare population of leukocytes which produce high amounts of type I interferon in response to certain viruses. Although those cells were first described in 1958, there are still unsolved issues related to their origin and function. Recently, a leukemic counterpart of plasmacytoid dendritic cells was identified. Molecular approaches using either normal or leukemic plasmacytoid dendritic cells provide some new insights into the controversial lymphoid origin of those cells. The need for specific markers is still a critical aspect for the identification of plasmacytoid dendritic cells, whatever stage of differentiation, in normal as well as in pathological conditions. Hopefully, novel markers will allow delineation of the relationships between dendritic cells at different stages of differentiation/maturation along the myeloid and lymphoid lineages. 相似文献
1000.
Moore ST Clément G Raphan T Cohen B 《Experimental brain research. Experimentelle Hirnforschung. Expérimentation cérébrale》2001,137(3-4):323-335
During the 1998 Neurolab mission (STS-90), four astronauts were exposed to interaural centripetal accelerations (Gy centrifugation)
of 0.5g and 1g during rotation on a centrifuge, both on Earth and during orbital space flight. Subjects were oriented either left-ear out
or right-ear out, facing or back to motion. Binocular eye movements were measured in three dimensions using a video technique.
On Earth, tangential centrifugation that produces 1g of interaural linear acceleration combines with gravity to tilt the gravitoinertial acceleration (GIA) vector 45° in the
roll plane relative to the head vertical, generating a summed vector of 1.4g. Before flight, this elicited mean ocular counterrolling (OCR) of 5.7°. Due to the relative absence of gravity during flight,
there was no linear acceleration along the dorsoventral axis of the head. As a result, during in-flight centrifugation, gravitoinertial
acceleration was strictly aligned with the centripetal acceleration along the interaural axis. There was a small but significant
decrease (mean 10%) in the magnitude of OCR in space (5.1°). The magnitude of OCR during postflight 1g centrifugation was not significantly different from preflight OCR (5.9°). Findings were similar for 0.5g centrifugation, but the OCR magnitude was approximately 60% of that induced by centrifugation at 1g. OCR during pre- and postflight static tilt was not significantly different and was always less than OCR elicited by centrifugation
on Earth for an equivalent interaural linear acceleration. In contrast, there was no difference between the OCR generated
by in-flight centrifugation and by static tilt on Earth at equivalent interaural linear accelerations. These data support
the following conclusions: (1) OCR is generated predominantly in response to interaural linear acceleration; (2) the increased
OCR during centrifugation on Earth is a response to the head dorsoventral 1g linear acceleration component, which was absent in microgravity. The dorsoventral linear acceleration could have activated
either the otoliths or body-tilt receptors that responded to the larger GIA magnitude (1.4g), to generate the increased OCR during centrifugation on Earth. A striking finding was that magnitude of OCR was maintained
throughout and after flight. This is in contrast to most previous postflight OCR studies, which have generally registered
decreases in OCR. We postulate that intermittent exposure to artificial gravity, in the form of the centripetal acceleration
experienced during centrifugation, acted as a countermeasure to deconditioning of this otolith-ocular orienting reflex during
the 16-day mission.
Electronic Publication 相似文献