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硬质O_2玉米的选育方法研究 被引量:1
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作者 胡建涛 王友华 +4 位作者 祁玉良 齐建双 程辉 沈光辉 胡书娅 《现代农业科技》 2006年第11S期105-106,115,共3页
玉米opaque-2基因能够显著提高玉米胚乳中的赖氨酸、色氨酸含量,但胚乳质地松软。有研究发现,玉米opaque-2基因能够有效地提高玉米胚乳的硬质度,但在不同的遗传背景中的表达不尽相同。通过对两个不同遗传背景的回交六代材料A、B两个群... 玉米opaque-2基因能够显著提高玉米胚乳中的赖氨酸、色氨酸含量,但胚乳质地松软。有研究发现,玉米opaque-2基因能够有效地提高玉米胚乳的硬质度,但在不同的遗传背景中的表达不尽相同。通过对两个不同遗传背景的回交六代材料A、B两个群体的考察,根据他们不同的遗传背景表达相同,来说明在不同的遗传背景下选育硬质高赖氨酸自交系需要用不同的选育方法。结果表明:两个遗传背景下都有部分单株软粒与硬粒的比例小于1/3,即双隐性基因所占比例小于1/4,但材料A软粒与硬粒的比例变化幅度较大。得出材料A用分子标记的方法更容易选育硬质高赖氨酸自交系;材料B从表型考种更容易选育硬质高赖氨酸自交系的结论。 展开更多
关键词 opaque-2基因 遗传背景 硬质高赖氨酸 卡方测验
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利用选择回交导入群体定位大豆蛋白质含量QTL 被引量:9
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作者 张金巍 韩粉霞 +4 位作者 陈明阳 孙君明 韩广振 闫淑荣 杨华 《中国油料作物学报》 CAS CSCD 北大核心 2015年第4期433-442,共10页
大豆是重要的植物蛋白来源,定位大豆蛋白质含量QTL,可为分子标记辅助育种和基因挖掘提供依据。本研究以我国综合性状优良的黄淮海主栽品种中黄13为轮回亲本,日本品种东山69为供体亲本,构建了BC2F2回交导入系群体;利用性状–标记间的单... 大豆是重要的植物蛋白来源,定位大豆蛋白质含量QTL,可为分子标记辅助育种和基因挖掘提供依据。本研究以我国综合性状优良的黄淮海主栽品种中黄13为轮回亲本,日本品种东山69为供体亲本,构建了BC2F2回交导入系群体;利用性状–标记间的单向方差分析和卡方测验检测BC2F2随机群体(RP)及选择回交导入群体(BSP、PSP和NSP)中影响大豆蛋白质含量的QTL。2种方法在4个群体中定位到蛋白质含量相关的QTL 42个,5个位点在随机群体和极端选择群体中被多次重复检测到,分别为Sat_202、Satt170、Satt282、Sat_074、和Satt146;单向方差分析在随机群体和双向选择群体中同时检测到Sat_077、Sat_202、Satt282、Satt146和Satt712等5个效应值较大(>10%)的蛋白质含量QTL,分别位于C1、C2、D1b、F和J连锁群上,位于D1b和J连锁群上的Satt282和Satt712效应最大,F值达到8.77、7.80和9.01、11.61,与其连锁的QTL能解释的表型变异分别达13.55%、21.40%和13.85%、28.82%;卡方测验在极端选择群体中检测到的8个QTL与单向方差分析在随机群体中检测到的位点一致,其中双向选择群体检测到4个(Sat_202、Satt301、Sat_074和Satt146)、正向选择群体检测到2个(Satt250和Satt485)、负向选择群体检测到5个(Sat_202、Satt170、Satt282、Sat_074和Satt146)。定位到42个蛋白质相关QTL,结果表明单向方差分析对双向选择群体有一定的应用价值,卡方测验更适合单向选择群体的QTL检测。 展开更多
关键词 大豆 蛋白质含量 选择回交导入群体 单向差分析 卡方测验 QTL定位
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甘蓝型油菜几个苗期形态标记的遗传 被引量:5
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作者 涂金星 傅廷栋 《华中农业大学学报》 CAS CSCD 北大核心 2001年第4期318-320,共3页
关键词 甘蓝型油菜 形态标记 遗传 苗期 性状分离 卡方测验
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Non-Specific Factors Involved in the Treatment: Its Influence on Treatment Adherence
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作者 Gerardo A. Fridman 《Journal of Pharmacy and Pharmacology》 2017年第6期340-348,共9页
Introduction: The effectiveness of treatment depends on the efficacy of the therapy and the level of compliance of the patient. NF (non-specific factors) involved in treatment are all those effects that do not depe... Introduction: The effectiveness of treatment depends on the efficacy of the therapy and the level of compliance of the patient. NF (non-specific factors) involved in treatment are all those effects that do not depend on the pharmacological properties of the drug. Materials and Methods: The job lasted a year. The sample consisted of patients with mental health disorders and was divided into two groups. Treatment compliance was measured with the Morisky-Green Test. Results were compared using the chi square test and relative risk. Results and Discussion: Group A had 23 patients ending 91.3% of them and group B of 22 patients, ending the 77.27%. At the beginning of the study, we found in the group A 0.86 NF/patients while in the group B 0.82 NF/patient. At the end of the study there was a 54.65% decrease in group A while in group B the proportion remained. At the beginning of the study both groups had approximately 40% of compliant patients. Data that remained in the control group rose to 80.95% in group A at the end of the study. Conclusions: The work demonstrates the negative influence of these factors on adherence to treatment. 展开更多
关键词 Adhesion to treatment nonspecific factors influencing treatment health professional patient family environment.
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Determination of Causal Effect in Observational Studies: Analysis of Correlated Data with Binary End-Points 被引量:1
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作者 Maupi Eric Letsoalo Maseka Lesaoana 《Journal of Mathematics and System Science》 2012年第2期119-125,共7页
Identifying the causal impact of' some intervention challenging when one is faced with correlated binary end-points in observational studies is a challenging task, and it is even more The statistical literature on an... Identifying the causal impact of' some intervention challenging when one is faced with correlated binary end-points in observational studies is a challenging task, and it is even more The statistical literature on analyzing such data is well documented. Dependence between observations from the same study subject in correlated data renders invalid the usual chi-square tests of independence and inflates the variance ofparameter estimates. Disaggregated approaches such as hierarchical linear models which are able to adjust for individual level covariate:s are favoured in the analysis of such data, thereby gaining power over aggregated and individual-level analyses. In this article the authors, therefore, address the issue of analyzing correlated data with dichotomous end-points by using hierarchical logistic regression, a generalization of the standard logistic regression model for independent outcomes. 展开更多
关键词 Correlated data observational studies counterfactual problem hierarchical models group randomization treatment effect.
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An International Journalism Model of Professionalism in News Production: The Concepts and the Measurements
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作者 Khalaf Tahat 《Journalism and Mass Communication》 2016年第4期169-186,共18页
This study aimed to contribute in establishing an international journalism model of professionalism in the production of the news. The main purpose is to explore the degree to which this model predicts the professiona... This study aimed to contribute in establishing an international journalism model of professionalism in the production of the news. The main purpose is to explore the degree to which this model predicts the professional values in the media content. In particular, this model was tested on the content of a leading news organization in the Middle East, AI Jazeera, to identify whether or not AI Jazeera reflected professional values in news production or other non-professional values. A total of 592 news stories--234 from AJE and 358 from AJA--published from January I, 2014, to April 30, 2014, were analyzed. The findings of this study indicate that AI Jazeera reflects professional values to a substantial degree. The professional values were reflected highly and nearly two thirds of the stories had professional values in the content. The chi square tests shows there are frequency/percentage differences, but overall the patterns are similar, with no statistically significant differences in the AJA and AlE. Scholarly implications, future studies and limitations were presented in this study. 展开更多
关键词 PROFESSIONALISM international journalism content analysis AI Jazeera
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统计学方法在遗传学实验教学中的应用与思考 被引量:1
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作者 王延伟 《佳木斯教育学院学报》 2011年第6期91-91,93,共2页
本文分析了经典遗传学定律验证及人类性状的遗传平衡分析中卡方测验的应用及多倍体诱导条件优化中试验设计的选取,并就目前遗传学实验教学中相关统计学的应用提出个人的看法。
关键词 卡方测验 试验设计 遗传定律 多倍体诱导
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