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31.
Xiaohua Yang Patricia Glazebrook Geraldine C. Ranasinghe Maricela Haghiac Virtu Calabuig-Navarro Judi Minium 《The journal of maternal-fetal & neonatal medicine》2019,32(6):971-978
Objective: Fetal fatty acid (FA) delivery is ultimately controlled by placental transport. Focus has been the maternal-placental interface, but regulation at the feto-placental interface is unknown.Methods: Placental macrovascular endothelial cells (EC) (n?=?4/group) and trophoblasts (TB) (n?=?5/group) were isolated from lean (pregravid BMI <25?kg/m2) and obese (body mass index (BMI)?>?30) women. Fatty acid transporters FAT/CD36, FABPpm, FATP4, FABP 3, 4 and 5, PLIN2 and PPARα, δ, γ expression, was measured in EC and TB. Transporter response to 24?h palmitate (PA) was assessed.Results: mRNA expression of FABP3, 4, 5 and PPARγ was 2- to 3-fold reduced in EC of obese versus lean women (p?.03), but not in TB. Protein level of FABPpm was 20% lower in obese (p?.05). Palmitate (PA) up-regulated CD36, FABP3, FABP4, and PLIN2 gene expression by 3- to 4-fold in lean but not obese EC (p?.05), while PA increased FABP4 and PLIN2 in lean and obese TB, and FABP5 in lean (p?.05) EC. PA exposure up-regulated peroxisome proliferator activated receptors (PPARs) 2-fold in lean and obese EC (p?.05), but not in TB.Conclusions: In obese women, FA transporter expression is lower in placental EC, but not TB, and less sensitive to saturated FA, compared to lean women. FA transport may be regulated at the feto-placental interface. 相似文献
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Adenine dinucleotides are a group of extracellular modulators involved in maintaining blood vessel tone. We have demonstrated previously that Ap2A and Ap4A induce the synthesis of both nitric oxide (NO) and prostacyclin (PGI2) in bovine aortic endothelial cells (BAEC), whereas Ap3A, Ap5A, and Ap6A do not. In this paper, we report that Ap2A and Ap4A are partial agonists for ATP in terms of Ca2+ mobilization and PGI2 synthesis. The Ap(4)A EC50 values for Ca2+ mobilization and PGI2 synthesis were significantly higher than the corresponding values for ATP, while the Ap4A B(max) values for Ca2+ mobilization and PGI2 synthesis were significantly lower than those for ATP. Ap2A and Ap4A concentration-effect curves for Ca2+ mobilization and PGI2 synthesis demonstrated that Ap2A and Ap4A have antagonistic effects at ATP concentrations that induce responses above the maximal amount of Ca2+ mobilized or PGI2 synthesized by these two dinucleotides. On the other hand, Ap2A and Ap4A have agonistic effects at ATP concentrations that induce PGI2 synthesis below the maximal amount of PGI2 synthesized by these two dinucleotides. We also present evidence that suggests Ap3A, Ap5A, and Ap6A are antagonists for ATP in terms of PGI2 synthesis. All these data are consistent with the adenine dinucleotides being negative modulators for ATP-induced PGI2 synthesis. 相似文献
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Santa PONCE-BRAVO Constantino LEDESMA-MONTES Maricela GARCéS-ORTíZ 《Journal of applied oral science : revista FOB》2015,23(3):265-271
Pleomorphic adenoma (PA) is the most common salivary gland tumor and its microscopic features and histogenesis are a matter of debate. Human milk fat globule protein membrane (HMFG) monoclonal antibodies (MoAbs) comprise a set of antibodies against the mucin 1 (MUC-1) protein detected in several salivary gland tumors.
Objective
The aim of this study was to assess the immunoexpression of the PA neoplastic cells to MUC-1 protein using HMFG-1 and HMFG-2 MoAbs, contrasting these results with those from normal salivary gland tissue.Material and Methods
Immunohistochemical detection of MUC-1 protein using HMFG-1 and HMFG-2 MoAbs was made in 5 mm thick, paraffin embedded slides, and the avidin-biotin method was used.Results
Positivity to HMFG-1 and HMFG-2 MoAbs was found in ductal, squamous metaplastic and neoplastic myoepithelial cells, keratin pearls and intraductal mucous material. Two kinds of myoepithelial cells were identified: classic myoepithelial cells around ducts were negative to both MoAbs, and modified myoepithelial cells were positive to both MoAbs. This last cellular group of the analyzed tumors showed similar MUC-1 immunoexpression to ductal epithelial cells using both HMFG antibodies. Intraductal mucous secretion was also HMFG-1 and HMFG-2 positive.Conclusions
Our results showed there are two kinds of myoepithelial cells in PA. The first cellular group is represented by the different kinds of neoplastic myoepithelial cells and is HMFG-positive. The second one is HMFG-negative and represented by the neoplastic myoepithelial cells located around the ducts. 相似文献36.
Robert G. Schaut Maricela Robles-Murguia Rachel Juelsgaard Kevin J. Esch Lyric C. Bartholomay Marcelo Ramalho-Ortigao Christine A. Petersen 《Emerging infectious diseases》2015,21(12):2209-2212
Leishmaniasis is a zoonotic disease caused by predominantly vectorborne Leishmania spp. In the United States, canine visceral leishmaniasis is common among hounds, and L. infantum vertical transmission among hounds has been confirmed. We found that L. infantum from hounds remains infective in sandflies, underscoring the risk for human exposure by vectorborne transmission. 相似文献
37.
Search for autism loci by combined analysis of Autism Genetic Resource Exchange and Finnish families
Ylisaukko-oja T Alarcón M Cantor RM Auranen M Vanhala R Kempas E von Wendt L Järvelä I Geschwind DH Peltonen L 《Annals of neurology》2006,59(1):145-155
OBJECTIVE: Several genome-wide screens have been performed in autism spectrum disorders resulting in the identification of numerous putative susceptibility loci. Analyses of pooled primary data should result in an increased sample size and the different study samples have a potential to strengthen the evidence for some earlier identified loci, reveal novel loci, and even to provide information of the general significance of the locus. The objective of this study was to search for potential susceptibility loci for autism, which are supported by two independent samples. METHODS: We performed a combined analysis of the primary genome scan data of the Autism Genetic Resource Exchange (AGRE) and Finnish autism samples to reveal susceptibility loci potentially shared by these study samples. RESULTS: In the initial combined data analysis, the best loci (p < 0.05) were observed at 1p12-q25, 3p24-26, 4q21-31, 5p15-q12, 6q14-21, 7q33-36, 8q22-24, 17p12-q21, and 19p13-q13. The combined analysis of Finnish and AGRE families showed the most promising shared locus on 3p24-26 with nonparametric logarithm of odds (NPL) score of 2.20 (p = 0.011). The combined data analysis did not provide increased linkage evidence for the earlier identified loci on 3q25-27 or 17p12-q21. However, the 17p12-q21 locus remained promising also in the combined sample (NPL(all) =2.38, p = 0.0076). INTERPRETATION: Our study of 314 autism families highlights the importance of further analyses on 3p24-26 locus involving comprehensive molecular genetic analyses of oxytocin receptor gene (OXTR), a positional and functional candidate gene for autism. 相似文献
38.
Cardenas R Lin X Canosa LF Luna M Arámburo C Peter RE 《General and comparative endocrinology》2003,132(1):119-124
Sex steroid hormones have been shown to regulate somatostatin (SRIF) gene expression in goldfish brain, which in turn influences the regulation of GH secretion. In this study, the influences of sex steroids on pituitary responsiveness to SRIF-14 and the pituitary expression of a type two SRIF receptor (sst(2)) were examined. Results from in vitro perifusion of pituitary fragments show that pituitaries from estradiol-primed sexually regressed female fish have significantly lower GH release responsiveness to pulse exposure to SRIF-14 than pituitaries from control or testosterone-treated sexually regressed females. Results from in vitro static culture show that pituitaries from sexually mature female fish have lower GH release responsiveness to SRIF-14 than those from sexually regressed females. In addition, the sst(2) receptor mRNA levels in pituitaries from mature and recrudescent female fish are significantly lower than in sexually regressed female fish. Our results indicate that estradiol acts at the level of the pituitary to regulate GH secretion by influencing the responsiveness to SRIF-14. The underlying mechanism includes, in part, reduction of the expression of sst(2) receptors, presumably leading to the lower number of the receptors available for SRIF binding. 相似文献
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40.
Magaña MT Ongay Z Tagle J Bentura G Cobián JG Perea FJ Casas-Castañeda M Sánchez-López YJ Ibarra B 《Blood cells, molecules & diseases》2002,28(2):121-126
To investigate the origin of the beta(A) and beta(S) genes in a Mexican population with African roots and a high frequency of hemoglobin S, we analyzed 467 individuals (288 unrelated) from different towns in the states of Guerrero and Oaxaca in the Costa Chica region. The frequency of the sickle-cell trait was 12.8%, which may represent a public health problem. The frequencies of the beta-haplotypes were determined from 350 nonrelated chromosomes (313 beta(A) and 37 beta(S)). We observed 15 different beta(A) haplotypes, the most common of which were haplotypes 1 (48.9%), 2 (13.4%), and 3 (13.4%). The calculation of pairwise distributions and Nei's genetic distance analysis using 32 worldwide populations showed that the beta(A) genes are more closely related to those of Mexican Mestizos and North Africans. Bantu and Benin haplotypes and haplotype 9 were related to the beta(S) genes, with frequencies of 78.8, 18.2, and 3.0%, respectively. Comparison of these haplotypes with 17 other populations revealed a high similitude with the population of the Central African Republic. These data suggest distinct origins for the beta(A) and beta(S) genes in Mexican individuals from the Costa Chica region. 相似文献