全文获取类型
收费全文 | 1542篇 |
免费 | 95篇 |
国内免费 | 36篇 |
专业分类
耳鼻咽喉 | 8篇 |
儿科学 | 90篇 |
妇产科学 | 60篇 |
基础医学 | 189篇 |
口腔科学 | 37篇 |
临床医学 | 177篇 |
内科学 | 206篇 |
皮肤病学 | 18篇 |
神经病学 | 64篇 |
特种医学 | 226篇 |
外科学 | 176篇 |
综合类 | 45篇 |
一般理论 | 4篇 |
预防医学 | 155篇 |
眼科学 | 33篇 |
药学 | 75篇 |
中国医学 | 1篇 |
肿瘤学 | 109篇 |
出版年
2022年 | 9篇 |
2021年 | 29篇 |
2019年 | 23篇 |
2018年 | 30篇 |
2017年 | 22篇 |
2016年 | 16篇 |
2015年 | 32篇 |
2014年 | 41篇 |
2013年 | 35篇 |
2012年 | 55篇 |
2011年 | 72篇 |
2010年 | 41篇 |
2009年 | 60篇 |
2008年 | 64篇 |
2007年 | 79篇 |
2006年 | 65篇 |
2005年 | 61篇 |
2004年 | 51篇 |
2003年 | 46篇 |
2002年 | 39篇 |
2001年 | 37篇 |
2000年 | 30篇 |
1999年 | 34篇 |
1998年 | 32篇 |
1997年 | 39篇 |
1996年 | 28篇 |
1995年 | 18篇 |
1994年 | 16篇 |
1993年 | 21篇 |
1992年 | 29篇 |
1991年 | 39篇 |
1990年 | 33篇 |
1989年 | 38篇 |
1988年 | 48篇 |
1987年 | 29篇 |
1986年 | 37篇 |
1985年 | 24篇 |
1984年 | 28篇 |
1983年 | 27篇 |
1982年 | 10篇 |
1981年 | 17篇 |
1980年 | 9篇 |
1979年 | 24篇 |
1978年 | 16篇 |
1977年 | 16篇 |
1976年 | 10篇 |
1975年 | 14篇 |
1974年 | 10篇 |
1973年 | 8篇 |
1972年 | 15篇 |
排序方式: 共有1673条查询结果,搜索用时 15 毫秒
11.
SG Saarland 《MedR Medizinrecht》2004,22(5):279-282
Ohne Zusammenfassung 相似文献
12.
J A Kalmar J J Eick C R Merritt S E Shuler K D Miller G B McFarland J J Jones 《Orthopedics》1988,11(3):417-425
Due to excellent soft tissue contrast and multiplanar imaging capability, MRI is assuming a major role in recognition, staging, and treatment planning of soft tissue and bone tumors. Direct sagittal, coronal, and axial images permit assessment of intraosseous and extraosseous extension of tumors and their relationship to the joints and neurovascular structures, and detection of "skip" lesions. MRI allows improved detection of recurrent tumors in the presence of non-ferromagnetic metallic implants as compared to CT. In the evaluation of soft tissue tumors, MRI is more sensitive than CT and allows differentiation among fat, muscle, tendon, bone, and vascular structures based on signal characteristics. Over a period of 18 months, 100 soft tissue masses and bone tumors were evaluated using MRI. Spin echo sequences with T1 and T2 weighted images were most valuable in differentiating normal and abnormal tissues. Calculated comparative measurements of relaxation times showed no reliable difference between benign and malignant tumors. 相似文献
13.
J. Garritano C. Martinez K. Grossman P. Intemann K. Merritt R. Pfoff T. Smock 《Experimental brain research. Experimentelle Hirnforschung. Expérimentation cérébrale》1996,112(1):35-40
We tested the role of C5 segment inspiratory interneurons in transcribing central respiratory drive to phrenic motoneurons and mediating intersegmental reflexes by cross-correlating the spontaneous activity of 26 interneurons with that of the ipsi -and contralateral C5 phrenic nerves in decerebrate cats. There were 10 interneurons that discharged only during inspiration (phrenic burst) and 16 that discharged tonically with increased firing during inspiration. Of the cross-correlograms for 26 of the interneurons with the ipsilateral phrenic, 20 were flat and 2 had peaks centred about time zero, interpreted as a common activation of the interneurons and motoneurons. The cross-correlograms for 4 other interneurons had troughs centred about time zero, interpreted as a synchronous excitation of the interneurons and inhibition of the motoneurons. Of the cross-correlograms for 23 interneurons with the contralateral phrenic, 22 were flat and 1 had a peak centred about time zero, interpreted as a common activation of the interneuron and motoneurons. Nine of ten cross-correlograms between pairs of interneurons were flat; one had a peak centred about time zero. We conclude that, despite their inspiratory modulated discharge patterns, there is no evidence from this study that the C5 segment inspiratory interneurons convey central respiratory drive to C5 phrenic motoneurons. 相似文献
14.
D. S. Strayer T. A. Merritt C. Makunike M. Hallman 《The American journal of pathology》1989,134(4):723-732
The authors tested the antigenicity of human lung surfactant isolated from amniotic fluid. Mice and rabbits were immunized. Rabbit polyclonal antisera to these surfactant preparations were absorbed with normal human plasma proteins. Polyclonal antisera reacted with both high molecular weight (35 kd) surfactant apoprotein and to lower molecular weight species, both 18 kd and 9 kd. Mice were used to generate monoclonal antibodies to surfactant. Enzyme-linked immunosorbant assay was used to identify five monoclonal antibodies that reacted with surfactant. By Western blot analysis, all of these recognized a low molecular weight surfactant species (9 kd) that could be either SP-B or SP-C. One reacted with a 37 kd protein in the surfactant preparation, consistent with SP-A. One monoclonal antibody also recognized a higher molecular weight species (44 kd) of unknown origin. The ability of antisera and monoclonal antibodies to inhibit the functional activity of surfactant was assayed using a pulsating bubble surfactometer. Rabbit polyclonal antisera inhibited initial surface adsorption to equilibrium surface tension and increased the minimum surface tension after 1 and 5 minutes of initiation of pulsations. This inhibitory activity of the antisera was noted in divalent F(ab')2 fragments. Monovalent F(ab) fragments and control normal rabbit sera did not inhibit surfactant function in this assay. Of the anti-surfactant monoclonal antibodies that reacted with surfactant by ELISA and Western blot, three inhibited its capacity to lower surface tension on the pulsating bubble apparatus. The other two monoclonal antibodies showed no functional inhibitory activity. It is concluded that both the 35 kd SP-A and the 9 kd proteins of human surfactant are highly immunogenic and partially crossreactive. Resulting antibodies could alter the ability of surfactant to perform its physiologic function, ie, to lower surface tension. 相似文献
15.
Viviane D Lima Patricia Kretz Anita Palepu Simon Bonner Thomas Kerr David Moore Mark Daniel Julio SG Montaner Robert S Hogg 《AIDS research and therapy》2006,3(1):14-9
Background
Although the impact of Aboriginal status on HIV incidence, HIV disease progression, and access to treatment has been investigated previously, little is known about the relationship between Aboriginal ethnicity and outcomes associated with highly active antiretroviral therapy (HAART). We undertook the present analysis to determine if Aboriginal and non-Aboriginal persons respond differently to HAART by measuring HIV plasma viral load response, CD4 cell response and time to all-cause mortality. 相似文献16.
L M Wenz K Merritt S A Brown A Moet A D Steffee 《Journal of biomedical materials research》1990,24(2):207-215
Short carbon fiber reinforced composites could potentially replace some of the metal alloys used in orthopedic implants. In particular, polysulfone and, more recently, polyetheretherketone have been considered as the matrix material for carbon fiber reinforced composite implant materials. ASTM standards F813 and F619 for direct contact cell culture evaluation and extraction were employed to determine the in vitro biocompatibility of a carbon fiber composite of polyetheretherketone, PEEK, in comparison to a carbon fiber reinforced polysulfone composite. The cell cultures were assessed qualitatively by microscopy and quantitatively using an enzyme assay to determine cytotoxicity. Overall, the cellular response to the PEEK and polysulfone composites were negligible indicating that further in vivo studies with these materials are appropriate. 相似文献
17.
A second locus (GLC3B) for primary congenital glaucoma (Buphthalmos) maps to the 1p36 region 总被引:10,自引:0,他引:10
Akarsu AN; Turacli ME; Aktan SG; Barsoum-Homsy M; Chevrette L; Sayli BS; Sarfarazi M 《Human molecular genetics》1996,5(8):1199-1203
Primary congenital glaucoma (gene symbol: GLC3) is an ocular disorder that
occurs for 0.01-0.04% of blind people. In the majority of familial cases
reported so far, this condition is inherited as an autosomal recessive
trait. We have recently used a group of 17 GLC3 families with a minimum of
two affected offspring and consanguinity in most of the parental generation
and mapped the first GLC3 locus (GLC3A) to the 2p21 region. Six families
did not show any linkage to the GLC3A locus and thus provided evidence for
genetic heterogeneity of this disorder. A total of eight families unlinked
to the 2p21 region were used to search for the chromosomal location of the
second GLC3 locus. Herein, we describe mapping of a new locus (designated
GLC3B) for primary congenital glaucoma to the short arm of chromosome 1
(1p36.2-36.1) that is situated centromeric to the neuroblastoma and
Charcot-Marie-Tooth type 2A (CMT2A) loci. A total of 17 DNA markers were
genotyped from this region of chromosome 1. Four families showed no
recombination with the two markers D1S2834 and D1S402 with a maximum lod
score of 4.510 and 4.157 respectively. Pairwise and multipoint linkage
analysis and inspection of the haplotypes revealed that the remaining four
families are not linked to this part of chromosome 1, thus providing
further evidence that at least one more locus for the autosomal recessive
form of GLC3 must exist in the genome. Based on the recombination events,
the overall linkage map of this region is: tel-D1S1192-D1S1635-D1S1193 -
(D1S1597/-D1S489/D1S228)- [GLC3B/D1S2834/D1S402] - (D1S1176/D1S507/D1S407)
- D1S2728-(MFAP2/D1S170) - D1S1368 - D1S436- D1S1592-cen.
相似文献
18.
R J Merritt M Kalsch L D Roux J Ashley-Mills S S Siegel 《JPEN. Journal of parenteral and enteral nutrition》1985,9(3):303-306
Nutritional status was evaluated on 210 occasions in 90 pediatric oncology inpatients during a 7-month period; 39 had solid tumors and 51 leukemia. Ages ranged from 3 months to 20 yr. Nutritional parameters were defined as normal, "at risk," or "probably malnourished." Fifty-seven and 29% of assessments revealed at least one parameter "at risk" or "probably malnourished," respectively. Prognosis was negatively related to the number of abnormal nutritional parameters. Serum albumin was most frequently abnormal. However, on most occasions, hypoalbuminemia was associated with weight/height, arm muscle area, and triceps skinfold measurements in the normal range. In order to further identify determinants of serum albumin, we analyzed dietary, chemotherapy, and temperature data in 10 prospectively studied leukemia patients, half of whom received parenteral nutrition. In these patients there was little relationship of serum albumin to chemotherapy or dietary intake. In all of these patients, especially those receiving total parenteral nutrition, low serum albumin was highly associated with fever (p less than 0.0005). We concluded that febrile illness is an important determinant of abnormal serum albumin concentrations. In pediatric cancer patients, abnormal serum albumin may more often reflect the acute metabolic response to fever and infection than depletion of body mass. 相似文献
19.
Lange Rael T. French Louis M. Bailie Jason M. Merritt Victoria C. Pattinson Cassandra L. Hungerford Lars D. Lippa Sara. M. Brickell Tracey A. 《Quality of life research》2022,31(8):2411-2422
Quality of Life Research - This study examined the clinical utility of post-traumatic stress disorder (PTSD), low resilience, poor sleep, and lifetime blast exposure as risk factors for predicting... 相似文献
20.
Maternal and infant nutrition are problematic in areas of Ethiopia. Health extension workers (HEWs) work in Ethiopia’s primary health care system, increasing potential health service coverage, particularly for women and children, providing an opportunity for health improvement. Their roles include improving maternal and infant nutrition, disease prevention, and health education. Supporting HEWs’ practice with ‘non-clinical’ skills in behavior change and health communication can improve effectiveness. This intervention study adapted and delivered a UK-developed training intervention for Health Extension Workers (HEWs) working with the United Nations World Food Programme in Ethiopia. The intervention included communication and behavioral training adapted with local contextual information. Mixed methods evaluation focused on participants’ reaction to training, knowledge, behavior change, and skills use. Overall, 98 HEWs were trained. The intervention was positively received by HEWs. Pre-post evaluations of communication and behavior change skills found a positive impact on HEW skills, knowledge, and motivation to use skills (all p < 0.001) to change women’s nutritional behavior, also demonstrated in role-play scenarios. The study offered substantial learning about intervention delivery. Appropriate cultural adaptation and careful consideration of assessment of psychological constructs are crucial for future delivery. 相似文献