研究提出一种通过化学键键能差进行能量密度快速估算的方法,和一种利用拉普拉斯键级和分子片段键离解能相结合快速判断笼型结构稳定性的方法。通过穷举法构建了基于Noradamantane的所有富氮骨架及其435种硝基衍生物,应用上述计算方法筛...研究提出一种通过化学键键能差进行能量密度快速估算的方法,和一种利用拉普拉斯键级和分子片段键离解能相结合快速判断笼型结构稳定性的方法。通过穷举法构建了基于Noradamantane的所有富氮骨架及其435种硝基衍生物,应用上述计算方法筛选兼具高能量密度和稳定性的分子结构,并采用量子化学能量计算和过渡态反应势垒计算验证筛选结果的可靠性。计算发现了两种兼顾高能量密度和结构稳定性的硝基化合物,其爆热、爆速、爆压和金属加速能力的理论计算最大值分别达到7.77 k J·g^(-1)、10.1 km·s^(-1)、47 GPa和1.14倍HMX的金属加速能力,且结构分解反应势垒≥96 k J·mol^(-1)。本研究所建立的含能分子能量密度和稳定性快速筛选方法,可为高能稳定的含能分子设计提供参考。展开更多
目的:研究分析实验室检测指标以及外周血、骨髓细胞形态,以鉴别诊断巨幼细胞性贫血(MA)与骨髓增生异常综合征(MDS)。方法:选取2020年10月—2022年6月南方医科大学顺德医院收治的21例MDS与17例MA患者作为研究对象,检测其血常规及维生素B1...目的:研究分析实验室检测指标以及外周血、骨髓细胞形态,以鉴别诊断巨幼细胞性贫血(MA)与骨髓增生异常综合征(MDS)。方法:选取2020年10月—2022年6月南方医科大学顺德医院收治的21例MDS与17例MA患者作为研究对象,检测其血常规及维生素B12(Vit B12),制作外周血涂片和骨髓涂片,观察细胞形态特征。结果:MA与MDS的全血细胞减少,红细胞(RBC)总数、血红蛋白(Hb)、红细胞平均体积(MCV)比较,差异无统计学意义(P>0.05),而Vit B12、MCV>100 f L比较,差异均有统计学意义(χ^(2)=30.762、3.979,P<0.05)。进行外周血细胞形态分析,嗜多色性红细胞、卡波环、中心淡染区扩大、原始粒细胞、双核粒细胞、粒细胞巨变、假Pelger-Huёt畸形、中性粒细胞核分叶多比较,差异均有统计学意义(χ^(2)=14.491、14.568、10.238、12.533、14.568、7.495、4.661,P<0.05),大血小板、畸形血小板比较,差异无统计学意义(P>0.05)。骨髓细胞形态分析,红系双核、奇数核、巨原红、巨早幼红、巨中幼红、大RBC、成熟红细胞大小不均,粒系原始粒细胞(≥5%)、巨中幼粒、巨晚幼粒、巨杆状核、假Pelger-Huёt畸形、核浆发育不平衡、中性粒细胞核分叶多(>5叶)、颗粒减少或无颗粒,巨核系巨核核分叶多、小巨核、双圆巨核、多圆巨核、微小巨核比较,差异均有统计学意义(χ^(2)=8.314、4.259、7.112、20.761、18.087、9.401、15.641、21.478、9.547、8.197、5.768、3.619、4.259、4.661,P<0.05)。红系核畸形、多核、巨晚幼红,粒系晚幼粒、棒槌小体、环状核,巨核系大血小板、畸形血小板比较,差异无统计学意义(P>0.05)。结论:MA与MDS血象均有不同程度的全血细胞减少,MA红细胞形态以大细胞(MCV>100 f L)为主,而Vit B12显著降低,结合血清Vit B12测定有助于两者的鉴别。MA病态造血主要体现三系的巨幼变;MDS则有一些克隆性证据,表现在红系有双核、奇数核,粒系可见原始粒细胞、双核粒细胞、假Pelger-Huёt畸形,巨核系可见小巨核、微小巨核、双圆巨核、多圆巨核细胞等。展开更多
The present study focused on evaluating the agronomic performance, stability, and anthracnose resistance of common bean lines derived through Marker-Assisted Backcrossing in Uganda. Eight marker-assisted selection (MA...The present study focused on evaluating the agronomic performance, stability, and anthracnose resistance of common bean lines derived through Marker-Assisted Backcrossing in Uganda. Eight marker-assisted selection (MAS) backcross-derived bush bean lines with red seed types, alongside two checks, were evaluated in a randomized complete block design replicated two times in five locations for three consecutive crop-growing seasons in 2021 and 2022. The study aimed to identify lines with both high stable yields and enhanced resistance to anthracnose disease for potential release and utilization in future bean varietal development in Uganda. Agronomic traits, including days to 50% flowering, days to 90% physiological maturity, seed yield, seed yield components, and anthracnose disease reaction under natural infestation were assessed. The response to anthracnose disease was further assessed using six isolates of Colletotrichum lindemuthianum representing six different races. Results indicated that the agronomic performances of the MAS backcross-derived bush bean lines were statistically comparable to the recurrent parent NABE14. Specifically, six lines exhibited statistically equal to or higher performance than NABE14 in terms of seed yield, total number of seeds and number of pods per plant. The combined analysis of variance for seed yield showed significant (p Co-4<sup>2</sup> and Co-5 anthracnose resistance genes in the derived line. In conclusion, UGKT-B157-4, identified as the best-performing and stable genotype, demonstrates promise for release and use in future bean varietal development in Uganda, offering a combination of high yields and enhanced anthracnose disease resistance. The study provides valuable insights into the potential of Marker-Assisted Backcrossing in improving common bean varieties in the region.展开更多
文摘研究提出一种通过化学键键能差进行能量密度快速估算的方法,和一种利用拉普拉斯键级和分子片段键离解能相结合快速判断笼型结构稳定性的方法。通过穷举法构建了基于Noradamantane的所有富氮骨架及其435种硝基衍生物,应用上述计算方法筛选兼具高能量密度和稳定性的分子结构,并采用量子化学能量计算和过渡态反应势垒计算验证筛选结果的可靠性。计算发现了两种兼顾高能量密度和结构稳定性的硝基化合物,其爆热、爆速、爆压和金属加速能力的理论计算最大值分别达到7.77 k J·g^(-1)、10.1 km·s^(-1)、47 GPa和1.14倍HMX的金属加速能力,且结构分解反应势垒≥96 k J·mol^(-1)。本研究所建立的含能分子能量密度和稳定性快速筛选方法,可为高能稳定的含能分子设计提供参考。
文摘目的:研究分析实验室检测指标以及外周血、骨髓细胞形态,以鉴别诊断巨幼细胞性贫血(MA)与骨髓增生异常综合征(MDS)。方法:选取2020年10月—2022年6月南方医科大学顺德医院收治的21例MDS与17例MA患者作为研究对象,检测其血常规及维生素B12(Vit B12),制作外周血涂片和骨髓涂片,观察细胞形态特征。结果:MA与MDS的全血细胞减少,红细胞(RBC)总数、血红蛋白(Hb)、红细胞平均体积(MCV)比较,差异无统计学意义(P>0.05),而Vit B12、MCV>100 f L比较,差异均有统计学意义(χ^(2)=30.762、3.979,P<0.05)。进行外周血细胞形态分析,嗜多色性红细胞、卡波环、中心淡染区扩大、原始粒细胞、双核粒细胞、粒细胞巨变、假Pelger-Huёt畸形、中性粒细胞核分叶多比较,差异均有统计学意义(χ^(2)=14.491、14.568、10.238、12.533、14.568、7.495、4.661,P<0.05),大血小板、畸形血小板比较,差异无统计学意义(P>0.05)。骨髓细胞形态分析,红系双核、奇数核、巨原红、巨早幼红、巨中幼红、大RBC、成熟红细胞大小不均,粒系原始粒细胞(≥5%)、巨中幼粒、巨晚幼粒、巨杆状核、假Pelger-Huёt畸形、核浆发育不平衡、中性粒细胞核分叶多(>5叶)、颗粒减少或无颗粒,巨核系巨核核分叶多、小巨核、双圆巨核、多圆巨核、微小巨核比较,差异均有统计学意义(χ^(2)=8.314、4.259、7.112、20.761、18.087、9.401、15.641、21.478、9.547、8.197、5.768、3.619、4.259、4.661,P<0.05)。红系核畸形、多核、巨晚幼红,粒系晚幼粒、棒槌小体、环状核,巨核系大血小板、畸形血小板比较,差异无统计学意义(P>0.05)。结论:MA与MDS血象均有不同程度的全血细胞减少,MA红细胞形态以大细胞(MCV>100 f L)为主,而Vit B12显著降低,结合血清Vit B12测定有助于两者的鉴别。MA病态造血主要体现三系的巨幼变;MDS则有一些克隆性证据,表现在红系有双核、奇数核,粒系可见原始粒细胞、双核粒细胞、假Pelger-Huёt畸形,巨核系可见小巨核、微小巨核、双圆巨核、多圆巨核细胞等。
文摘The present study focused on evaluating the agronomic performance, stability, and anthracnose resistance of common bean lines derived through Marker-Assisted Backcrossing in Uganda. Eight marker-assisted selection (MAS) backcross-derived bush bean lines with red seed types, alongside two checks, were evaluated in a randomized complete block design replicated two times in five locations for three consecutive crop-growing seasons in 2021 and 2022. The study aimed to identify lines with both high stable yields and enhanced resistance to anthracnose disease for potential release and utilization in future bean varietal development in Uganda. Agronomic traits, including days to 50% flowering, days to 90% physiological maturity, seed yield, seed yield components, and anthracnose disease reaction under natural infestation were assessed. The response to anthracnose disease was further assessed using six isolates of Colletotrichum lindemuthianum representing six different races. Results indicated that the agronomic performances of the MAS backcross-derived bush bean lines were statistically comparable to the recurrent parent NABE14. Specifically, six lines exhibited statistically equal to or higher performance than NABE14 in terms of seed yield, total number of seeds and number of pods per plant. The combined analysis of variance for seed yield showed significant (p Co-4<sup>2</sup> and Co-5 anthracnose resistance genes in the derived line. In conclusion, UGKT-B157-4, identified as the best-performing and stable genotype, demonstrates promise for release and use in future bean varietal development in Uganda, offering a combination of high yields and enhanced anthracnose disease resistance. The study provides valuable insights into the potential of Marker-Assisted Backcrossing in improving common bean varieties in the region.
