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1.
目的采用竞争性等位基因特异性PCR(KASP)法、单碱基末端延伸(SNaPshot)法对载脂蛋白E(APOE)进行分型检测,并与Sanger测序法比较,以期获得更为高效、稳定、经济的中、高通量APOE分型手段。方法选取既往收集的覆盖全部6种常见APOE分型的阿尔茨海默病(AD)及轻度认知障碍(MCI)患者全血核酸样本48份,根据KASP法和SNaPshot法技术原理设计实验识别APOE 2个关键单核苷酸多态性(SNP)位点rs429358和rs7412,并对样本进行APOE分型检测。调整样本顺序重复检测以验证方法的稳定性和可重复性。扩大样本量,收集AD、MCI患者全血样本107份,采用上述两种方法进行APOE分型检测,Sanger测序法验证。结果采用KASP法和SNaPshot法对48份已知APOE分型样本的2次检测结果与原分型完全一致。进一步扩大样本量对107例样本进行分型检测,与Sanger测序法得到的结果完全一致。结论采用KASP法和SNaPshot法进行APOE分型检测具有快速、准确、结果直观等特点,应用中、高通量APOE分型检测相对于Sanger测序法效率更高、成本更低,具有一定推广应用价值。  相似文献   
2.
Many studies have reported age-associated DNA methylation changes and age-predictive models in various tissues and body fluids. Although age-associated DNA methylation changes can be tissue-specific, a multi-tissue age predictor that is applicable to various tissues and body fluids with considerable prediction accuracy might be valuable. In this study, DNA methylation at 5 CpG sites from the ELOVL2, FHL2, KLF14, C1orf132/MIR29B2C, and TRIM59 genes were investigated in 448 samples from blood, saliva, and buccal swabs. A multiplex methylation SNaPshot assay was developed to measure DNA methylation simultaneously at the 5 CpG sites. Among the 5 CpG sites, 3 CpG sites in the ELOVL2, KLF14 and TRIM59 genes demonstrated strong correlation between DNA methylation and age in all 3 sample types. Age prediction models built separately for each sample type using the DNA methylation values at the 5 CpG sites showed high prediction accuracy with a Mean Absolute Deviation from the chronological age (MAD) of 3.478 years in blood, 3.552 years in saliva and 4.293 years in buccal swab samples. A tissue-combined model constructed with 300 training samples including 100 samples from each blood, saliva and buccal swab samples demonstrated a very strong correlation between predicted and chronological ages (r = 0.937) and a high prediction accuracy with a MAD of 3.844 years in the 148 independent test set samples of 50 blood, 50 saliva and 48 buccal swab samples. Although more validation might be needed, the tissue-combined model’s prediction accuracies in each sample type were very much similar to those obtained from each tissue-specific model. The multiplex methylation SNaPshot assay and the age prediction models in our study would be useful in forensic analysis, which frequently involves DNA from blood, saliva, and buccal swab samples.  相似文献   
3.
目的探讨围绝经期妇女的FSHR基因单核苷酸多态性(SNPs)与卵巢功能衰退的相关性。方法根据血清FSH水平,分为卵巢功能正常组(正常组)84例、卵巢储备功能下降组(下降组)77例和卵巢功能衰竭组(衰竭组)34例。应用SNaPshot技术,进行FSHR基因Ser680Asn多态性检测。结果 FSHR基因Ser680Asn位点基因型频率分布三组之间差异有统计学意义(χ2=8.5648,P=0.0138)。两两分析,正常组和下降组之间差异有统计学意义(χ2=9.0386,P=0.0109),正常组和衰竭组之间差异有统计学意义(χ2=8.3186,P=0.0156)。等位基因频率的分布在三组之间差异有统计学意义(χ2=7.6645,P=0.0056)。两两分析,正常组和衰竭组之间差异有统计学意义(χ2=8.3449,P=0.039),下降组和衰竭组之间差异有统计学意义(χ2=3.8502,P=0.0497)。且卵巢功能随基因型的变化(Asn/Asn,Asn/Ser和Ser/Ser)呈现降低趋势(χ2=8.5648,P=0.0138)。结论 FSHR基因Ser680Asn单核苷酸多态性对围绝经期妇女卵巢功能有影响,与卵巢功能的下降和衰竭相关。  相似文献   
4.
目的探讨磺脲类药物受体1(SUR1)基因的外显子16-3c/t、内向整流性钾通道(potassium inwardly-rectifying channel subfamily J,member 11,KCNJ11)基因的E23K变异与2型糖尿病(type 2 diabetes mellitus,T2DM)患者磺脲类药物继发性失效(secondary failure of sulfonylurea,SFS)的关系。方法选取山东地区T2DM患者200例,其中磺脲类药物有效者114例,SFS者86例,运用SNaPshot技术(ABI Biosystem,USA)对SUR1 16-3c/t、KCNJ11 E23K进行基因分型。结果 SUR1 16-3c/t和KCNJ11 E23K等位基因的发生频率均符合Hardy-Weinberg平衡;KCNJ11 E23K各基因型的分布在SFS组及有效组之间差异无统计学意义(P>0.05);SUR116-3c/t各基因型的分布在SFS组和有效组之间差异有统计学意义(P<0.01),且"t"等位基因的频率在SFS组明显增高[比值比(OR)=1.87,95%可信区间(CI)为1.23~2.85,P<0.01]。Logistic回归分析中,校正性别、年龄、BMI、F-C肽、TG、TC、HDL-C、LDL-C后,SUR1 16-3c/t的t/t基因型是SFS发生的独立危险因素[比值比(OR)=2.82,95%可信区间(CI)为1.57~5.07,P<0.01]。结论 SUR1外显子16-3c/t多态性可能与山东地区磺脲类药物继发性失效有明显相关性。  相似文献   
5.
Introduction:An increasing number of targeted drugs have been tested for the treatment of nasopharyngeal carcinoma (NPC). However, targeted therapy-related oncogenic mutations have not been fully evalu...  相似文献   
6.
Age estimation based on epigenetic markers is a DNA intelligence tool with the potential to provide relevant information for criminal investigations, as well as to improve the inference of age-dependent physical characteristics such as male pattern baldness or hair color. Age prediction models have been developed based on different tissues, including saliva and buccal cells, which show different methylation patterns as they are composed of different cell populations. On many occasions in a criminal investigation, the origin of a sample or the proportion of tissues is not known with certainty, for example the provenance of cigarette butts, so use of combined models can provide lower prediction errors.In the present study, two tissue-specific and seven age-correlated CpG sites were selected from publicly available data from the Illumina HumanMethylation 450 BeadChip and bibliographic searches, to help build a tissue-dependent, and an age-prediction model, respectively. For the development of both models, a total of 184 samples (N = 91 saliva and N = 93 buccal cells) ranging from 21 to 86 years old were used. Validation of the models was performed using either k-fold cross-validation and an additional set of 184 samples (N = 93 saliva and N = 91 buccal cells, 21–86 years old).The tissue prediction model was developed using two CpG sites (HUNK and RUNX1) based on logistic regression that produced a correct classification rate for saliva and buccal swab samples of 88.59 % for the training set, and 83.69 % for the testing set. Despite these high success rates, a combined age prediction model was developed covering both saliva and buccal cells, using seven CpG sites (cg10501210, LHFPL4, ELOVL2, PDE4C, HOXC4, OTUD7A and EDARADD) based on multivariate quantile regression giving a median absolute error (MAE): ± 3.54 years and a correct classification rate ( %CP±PI) of 76.08 % for the training set, and an MAE of ± 3.66 years and a %CP±PI of 71.19 % for the testing set. The addition of tissue-of origin as a co-variate to the model was assessed, but no improvement was detected in age predictions. Finally, considering the limitations usually faced by forensic DNA analyses, the robustness of the model and the minimum recommended amount of input DNA for bisulfite conversion were evaluated, considering up to 10 ng of genomic DNA for reproducible results. The final multivariate quantile regression age predictor based on the models we developed has been placed in the open-access Snipper forensic classification website.  相似文献   
7.
8.
目的:探讨ATP结合盒转运蛋白A3基因(ABCA3) rs13332514(C.1059G/A)、rs117515055(C.213C/T)两个多态性位点与陕西汉族人群新生儿呼吸窘迫综合征( NRDS)的遗传易感性。方法用SNaPshot多重微测序技术检测60例陕西汉族NRDS患者和120名健康对照者 ABCA3基因 rs13332514( C.1059G/A )、rs117515055( C.213C/T )两个多态性位点。结果rs117515055位点有两种基因型,对其进行比较,发现T等位基因在病例组(5.1%)高于对照组(3.1%),但是差异无统计学意义;rs13332514位点CC基因型频率及C等位基因频率在病例组高于对照组(50.8%vs44.1%,69.5%vs63.5%),差异亦无统计学意义。结论 rs117515055位点的T等位基因及rs13332514位点的C等位基因可能与汉族人群的NRDS有关,还需扩大样本量做进一步研究。  相似文献   
9.
In the present study, a multiplexed genotyping assay for ten single nucleotide polymorphisms (SNPs) located within six pigmentation candidate genes was developed on modern biological samples and applied to DNA retrieved from 25 archeological human remains from southern central Siberia dating from the Bronze and Iron Ages. SNP genotyping was successful for the majority of ancient samples and revealed that most probably had typical European pigment features, i.e., blue or green eye color, light hair color and skin type, and were likely of European individual ancestry. To our knowledge, this study reports for the first time the multiplexed typing of autosomal SNPs on aged and degraded DNA. By providing valuable information on pigment traits of an individual and allowing individual biogeographical ancestry estimation, autosomal SNP typing can improve ancient DNA studies and aid human identification in some forensic casework situations when used to complement conventional molecular markers.  相似文献   
10.
The mdx mouse is an animal model for Duchenne muscular dystrophy (DMD). In order to evaluate possible treatments and to carry out genetic studies, it is essential to distinguish between mice that carry the dystrophic (mutant) or wild-type (wt) allele(s). The current amplification-resistant mutation system (ARMS) assay is labor intensive and yields false negatives, which reduces its efficiency as a screening tool. An alternate assay based on single-nucleotide polymorphism (SNP) primer extension technology (i.e., SNaPshot) is described. The SNaPshot assay has been optimized to identify both wild-type and mutant alleles, providing a robust, potentially automatable assay for high-throughput analysis.  相似文献   
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