This research aims at developing a plant regeneration system from leaf and petiole explants of Anthurium andraeanum Hort., thereby establish a foundation for mass production and transformation. Using tissue culture te...This research aims at developing a plant regeneration system from leaf and petiole explants of Anthurium andraeanum Hort., thereby establish a foundation for mass production and transformation. Using tissue culture technique, the conditions for callus induction, protocorm-like body （PLB） formation and plant regeneration from leaf explants and petiole of A. andraeanum, such as basal medium and plant growth regulator, were investigated. Totipotent callus was induced on a 1/2-strength MS medium containing 0.90 μmol L^-1 2,4-dichlorophenoxyacetic acid （2,4-D） and 8.88μmol L^-1 N6-benzyladenine （BA）. The callus exhibited complete hormone autonomy for growth and differentiation of PLBs. This callus proliferated well and was maintained by subculturing on 1/2 MS medium containing 0.90 μmol L^-1 2,4-D and 4.44 μmol L^-1 BA. On average, 8 protocorm-like bodies could be obtained from a piece of 4 mm callus after being transferred to the 1/2 MS medium with 4.44 μmol L^-1 BA after 8 wk of culture. The regenerated PLBs formed shoots and roots on 1/2 MS medium. After 24 wk of culture on these medium, well-developed plantlets for potting were produced. An efficient micropropagation method was established for indirect PLB formation and plant regeneration from leaf and petiole ofA. andraeanum.展开更多
目的研究剖宫产史对人工授精助孕临床妊娠率的影响。方法回顾性分析2012年2月—2022年6月在厦门大学附属妇女儿童医院生殖医学科接受夫精人工授精(artificial insemination by husband,AIH)治疗的至少有1次活胎分娩史的不孕患者336例,共...目的研究剖宫产史对人工授精助孕临床妊娠率的影响。方法回顾性分析2012年2月—2022年6月在厦门大学附属妇女儿童医院生殖医学科接受夫精人工授精(artificial insemination by husband,AIH)治疗的至少有1次活胎分娩史的不孕患者336例,共560个周期,其中瘢痕子宫组203个周期,阴道分娩组357个周期。比较2组年龄、身体质量指数(body mass index,BMI)、输卵管盆腔因素、内膜异位症占比、治疗方案及助孕结果等。结果2组的年龄、高龄占比(>35岁)、不孕年限、输卵管盆腔因素、内膜异位症占比比较,差异无统计学意义(P>0.05)。瘢痕子宫组患者BMI为(22.30±3.27)kg/m^(2),高于阴道分娩组的(21.67±2.76)kg/m^(2)(P<0.05)。瘢痕子宫组BMI>23 kg/m^(2)的比例为36.9%,高于阴道分娩组的29.7%,差异无统计学意义(P=0.078)。瘢痕子宫组诱导排卵方案占比为53.7%(109/203),高于经阴道分娩组的44.3%(158/357),差异有统计学意义(P<0.05)。瘢痕子宫组临床妊娠率为15.3%,阴道分娩组为16.5%,差异无统计学意义(P=0.853)。结论通过适当的干预与筛选,可以提高有剖宫产史妇女的宫腔内人工授精临床妊娠率。展开更多
为研究电感效应、火花效应对接地体冲击特性的影响规律,区分2种效应占主导的影响范围,构建了接地体的电网络模型和考虑火花放电的迭代算法,并使用冲击大电流作用下的真型试验数据对上述模型、算法的有效性和准确性进行了验证。在此基础...为研究电感效应、火花效应对接地体冲击特性的影响规律,区分2种效应占主导的影响范围,构建了接地体的电网络模型和考虑火花放电的迭代算法,并使用冲击大电流作用下的真型试验数据对上述模型、算法的有效性和准确性进行了验证。在此基础上,对不同波形冲击电流作用下不同长度水平接地体的冲击特性进行了仿真计算。结果表明:随着土壤电阻率的增大,接地冲击特性呈现出由电感效应影响占主导逐渐转换为火花效应影响占主导;归纳得到归一化参数的临界值为450 k A·?,可以以此定量区分电感效应影响占主导和火花效应影响占主导的范围。所得结论对于优化设计伸长接地体和水平射线的长度具有指导意义。展开更多
基金supported by the Natural Science Foundation of Guangdong Province (05300848)Fok Ying Tung Education Foundation (104031)the National Natural Science Foundation of China(30800758)
文摘This research aims at developing a plant regeneration system from leaf and petiole explants of Anthurium andraeanum Hort., thereby establish a foundation for mass production and transformation. Using tissue culture technique, the conditions for callus induction, protocorm-like body （PLB） formation and plant regeneration from leaf explants and petiole of A. andraeanum, such as basal medium and plant growth regulator, were investigated. Totipotent callus was induced on a 1/2-strength MS medium containing 0.90 μmol L^-1 2,4-dichlorophenoxyacetic acid （2,4-D） and 8.88μmol L^-1 N6-benzyladenine （BA）. The callus exhibited complete hormone autonomy for growth and differentiation of PLBs. This callus proliferated well and was maintained by subculturing on 1/2 MS medium containing 0.90 μmol L^-1 2,4-D and 4.44 μmol L^-1 BA. On average, 8 protocorm-like bodies could be obtained from a piece of 4 mm callus after being transferred to the 1/2 MS medium with 4.44 μmol L^-1 BA after 8 wk of culture. The regenerated PLBs formed shoots and roots on 1/2 MS medium. After 24 wk of culture on these medium, well-developed plantlets for potting were produced. An efficient micropropagation method was established for indirect PLB formation and plant regeneration from leaf and petiole ofA. andraeanum.
文摘目的研究剖宫产史对人工授精助孕临床妊娠率的影响。方法回顾性分析2012年2月—2022年6月在厦门大学附属妇女儿童医院生殖医学科接受夫精人工授精(artificial insemination by husband,AIH)治疗的至少有1次活胎分娩史的不孕患者336例,共560个周期,其中瘢痕子宫组203个周期,阴道分娩组357个周期。比较2组年龄、身体质量指数(body mass index,BMI)、输卵管盆腔因素、内膜异位症占比、治疗方案及助孕结果等。结果2组的年龄、高龄占比(>35岁)、不孕年限、输卵管盆腔因素、内膜异位症占比比较,差异无统计学意义(P>0.05)。瘢痕子宫组患者BMI为(22.30±3.27)kg/m^(2),高于阴道分娩组的(21.67±2.76)kg/m^(2)(P<0.05)。瘢痕子宫组BMI>23 kg/m^(2)的比例为36.9%,高于阴道分娩组的29.7%,差异无统计学意义(P=0.078)。瘢痕子宫组诱导排卵方案占比为53.7%(109/203),高于经阴道分娩组的44.3%(158/357),差异有统计学意义(P<0.05)。瘢痕子宫组临床妊娠率为15.3%,阴道分娩组为16.5%,差异无统计学意义(P=0.853)。结论通过适当的干预与筛选,可以提高有剖宫产史妇女的宫腔内人工授精临床妊娠率。
文摘为研究电感效应、火花效应对接地体冲击特性的影响规律,区分2种效应占主导的影响范围,构建了接地体的电网络模型和考虑火花放电的迭代算法,并使用冲击大电流作用下的真型试验数据对上述模型、算法的有效性和准确性进行了验证。在此基础上,对不同波形冲击电流作用下不同长度水平接地体的冲击特性进行了仿真计算。结果表明:随着土壤电阻率的增大,接地冲击特性呈现出由电感效应影响占主导逐渐转换为火花效应影响占主导;归纳得到归一化参数的临界值为450 k A·?,可以以此定量区分电感效应影响占主导和火花效应影响占主导的范围。所得结论对于优化设计伸长接地体和水平射线的长度具有指导意义。
