Results 41 to 50 of about 22,208 (188)
Conservation Biology, EarlyView.Abstract Despite the crucial role of human impacts on biodiversity loss, many assessments of this loss focus on single metrics, such as species richness, and overlook the multidimensional effects of human activities. Because of its importance to ecosystem functioning, we investigated the functional diversity of medium‐ and large‐sized mammal ...
Xueyou Li +8 more
wiley +1 more source
Zhongguo shiyan zhenduanxue, 2009 目的探讨胆固醇7α-羟化酶（cholesterol 7α-hydroxylase,CYP7A1）基因多态性与阿尔茨海默病（AD）的关系。方法用PCR-RFLP方法分析7α-羟化酶A-204C多态性。结果A-204C多态性基因型频率、等位基因A、C频率在组间比较差异无显著性（P>0.05）,但基因型为CC的AD患者,其TC和LDL-C水平显著高于基因型为AC的AD患者（P0.05）,但患者组CC基因型与TC、LDL-C水平密切相关 ...
赵朝贤 +8 more
doaj
ApoE基因多态性与动脉粥样硬化性脑梗死的相关性研究 [PDF]
, 2018 目的分析ApoE基因与血脂和颈动脉粥样硬化程度的关系,进一步探讨ApoE基因与动脉粥样硬化性脑梗死的相关性。方法采用病例-对照研究的方法,收集厦门大学附属第一医院神经内科的95例缺血性脑卒中和65例非缺血性脑卒中住院患者。检测患者的ApoE基因型、血脂及颈动脉粥样硬化程度。结果与E2/E3比较,基因型E3/E3、E3/E4可能是缺血性脑卒中的保护因素;缺血性和非缺血性脑卒中患者在血浆TC、LDL-C、ApoB含量比较上均为E3/E4> E3/E3>E2/E3,且2组血浆LDL-C浓度在E3/E4与E2 ...
林志伟 +4 more
core
Geographic risks to functional groups of mammals and birds from habitat loss in Mexico
Conservation Biology, EarlyView.Abstract There is a need to quantify the impact of habitat loss due to anthropogenic factors on different aspects of biodiversity, such as functional trait diversity represented by functional groups (FGs). We developed a metric to assess the weighted risk of loss of habitat for 33 FGs of mammals and 36 FGs of birds in Mexico based on potential ...
Fernando Mayani‐Parás +4 more
wiley +1 more source
Zhongguo shiyan zhenduanxue, 2008 目的探讨FⅫ基因exon146C/T基因多态性与血栓形成的关联性。方法采用PCR-RFLP法鉴定了92例血栓性脑梗塞患者和87例静脉血栓患者及129例健康人的FⅫ基因exon146C/T基因型及C、T等位基因分布频率,采用多元Logistic非条件回归分析方法,进行多因素分析,解析FⅫ基因46C/T多态性与血栓性脑梗塞、静脉血栓形成的关联性。结果血栓性脑梗塞组和静脉血栓组的C等位基因分布频率均高于对照组,血栓性脑梗塞组的C/C基因型在血栓形成中的危险性是T/T基因型的14.533倍,具有统计学意义 ...
张玲 +5 more
doaj
OPN基因启动区-156delG多态性与中国HBV相关肝细胞癌的易感性 [PDF]
, 2017 【目的】研究骨桥蛋白（OPN）基因启动区多态性与乙型肝炎病毒相关肝细胞癌（HBV-HCC）遗传易感性的关 系。【方法】225例确诊为HBV-HCC患者与200例年龄匹配的慢性乙型肝炎患者被纳入研究。OPN基因启动区3个多态性 位点（-156delG/G ，-443T/C和-616T/G）通过直接测序法确定基因型。【结果】HBV-HCC组-156 delG/delG基因型分布频率高 于对照组（P = 0.003）。HCC组-156 delG等位基因频率显著增高（P < 0.001 ...
吴元凯, 时红, 李向永, 林国莉
core
Learning Styles, Engagement and Anxiety in AI‐Mediated Writing: A Multimodal Feedback Study
International Journal of Applied Linguistics, EarlyView.ABSTRACT Artificial intelligence (AI) tools now permeate English academic writing. However, evidence on how feedback modalities align with student differences and with psychological mechanisms remains limited. Prior work often reduced learning styles to simple matches with delivery modes and treated learning engagement and writing anxiety as peripheral.
Yi Ren +3 more
wiley +1 more source
MDR1基因+3435C/T基因型单核苷酸多态性对硼替佐咪治疗的多发性骨髓瘤预后的影响
Zhongguo shiyan zhenduanxue, 2013 目的探讨MDR1基因+3435C/T的单核苷酸多态性对硼替佐咪治疗的多发性骨髓瘤患者预后的影响。方法采用DNA测序方法检测MDR1基因+3435C/T的单核苷酸多态性;应用Kaplan-Meier来确认MDR1基因+3435C/T的单核苷酸多态性对硼替佐咪治疗/未治疗患者生存率的影响。结果 52.8%（n=47）的多发性骨髓瘤患者MDR1+3435位点的基因型为C/T,其余多发性骨髓瘤患者MDR1+3435位点的基因型均为T/T。MDR1+3435C/T基因型的患者的平均生存期为43.3月,而MDR1 ...
张伟, 董理
doaj
The preliminary study on the relationship of PAHs contamination and metabolic enzyme gene polymorphisms and adverse pregnancy outcomes [PDF]
, 2011 目的通过流行病学调查，掌握厦门地区妊娠妇女妊娠结局分布情况，并探讨多环芳烃污染等环境对妊娠结局的影响，结合多环芳烃代谢酶基因多态性分析，评价多环芳烃暴露对胎儿健康的危害。 方法利用问卷形式收集804例孕妇流行病学资料，以了解环境因素对妊娠妇女妊娠结局的影响。同时采用气相串联质谱（GC-MS）技术测定73例孕妇外周静脉血、新生儿脐带血中多环芳烃含量，同时应用聚合酶链反应一限制性片段长度多态性（PCR-RFLP）技术分析多环芳烃代谢酶基因多态性，以分析多环芳烃暴露对胎儿健康的危害。 结果 1 ...
杨帆
core
Research Progress on Gene Polymorphisms Related to Osteosarcoma [PDF]
Osteosarcoma, which primarily affects children and adolescents, is a highly malignant bone tumor with high rates of disability and mortality. Therefore, the exploration of biological markers related to its occurrence, development, and prognosis is ...
Jinyan LIU +4 more
core +1 more source