目的:探讨高危型人乳头状瘤病毒(high-risk human papilloma virus,HR-HPV)多重感染在宫颈鳞状细胞病变中的分布特点及临床意义,为宫颈病变的诊断、治疗以及预防性接种疫苗提供新的理论依据。方法:收集2011至2015年39331例女性患者的宫...目的:探讨高危型人乳头状瘤病毒(high-risk human papilloma virus,HR-HPV)多重感染在宫颈鳞状细胞病变中的分布特点及临床意义,为宫颈病变的诊断、治疗以及预防性接种疫苗提供新的理论依据。方法:收集2011至2015年39331例女性患者的宫颈HPV分型检测、液基细胞学(liquid based cytology,LCT)检查及部分宫颈活检诊断结果,分析HR-HPV多重感染与宫颈鳞状细胞病变患者的临床病理特征的关系。结果:在39331例患者中,HR-HPV多重感染者768例,年龄为(38.10±10.28)岁,2重感染及3重感染主要集中在21~50岁,4重以上感染主要集中在21~40岁。应用卡方检验进一步分析可以发现,2重感染、3重感染和4重以上感染在各年龄组的分布存在差异(χ^2=23.80,P=0.008);卡方检验风险分析显示,人群中HR-HPV多重感染增加宫颈鳞状细胞学异常发病的风险(OR=1.32,P=0.01);Spearman等级相关分析显示HR-HPV多重感染与宫颈鳞状细胞病变级别呈正相关(P=0.01)。结论:HR-HPV多重感染增加了宫颈癌前病变的发生及癌变风险,在诊断、治疗和预防宫颈病变时,应重点参考HR-HPV的多重感染情况。展开更多
【目的】比较3个杨树品种移栽后的生长特性,揭示一些杨树品种移栽造林后生长缓慢的原因。【方法】以欧美107杨(Populus×euramericana‘74/76’)、小美旱杨(Populus popularis Hsü(1-0))和毛白杨1316(Populus tomentosa‘1316...【目的】比较3个杨树品种移栽后的生长特性,揭示一些杨树品种移栽造林后生长缓慢的原因。【方法】以欧美107杨(Populus×euramericana‘74/76’)、小美旱杨(Populus popularis Hsü(1-0))和毛白杨1316(Populus tomentosa‘1316’)3个杨树品种为对象,2017年在观测全植株历经1个生长季后的地径、树高基础上,于2017-08-01和2017-09-14分别测定根、茎、叶生物量和叶面积,并于2017-08-30测定净光合速率和叶绿素含量(SPAD值),比较其相对生长速率(RGR)、净同化速率(NAR)、比叶面积(LSA)等指标。【结果】1)移栽1个生长季后,3个杨树品种地径、树高和生物量(包括茎、叶及植物整体)均表现为欧美107杨显著高于小美旱杨和毛白杨1316。2)欧美107杨相对生长速率显著高于小美旱杨和毛白杨1316,欧美107杨和毛白杨1316的平均叶面积均显著高于小美旱杨;三者净同化速率间差异显著,表现为小美旱杨>欧美107杨>毛白杨1316;小美旱杨和毛白杨1316的同化产物向茎的分配比例显著低于欧美107杨。3)欧美107杨和毛白杨1316的总叶面积、单叶面积和比叶面积均显著大于小美旱杨;三者叶片数量差异显著,表现为小美旱杨>欧美107杨>毛白杨1316;欧美107杨和小美旱杨的净光合速率和SPAD值均显著高于毛白杨1316。【结论】不同杨树品种生长特性取决于自身遗传特性,且移栽后生长缓慢的机制存在一定差别。展开更多
More than 40 kinds of selected minerals and compounds were individually irradiated by microwaves under an inert atmosphere,and the temperatures of samples were measured with a metal-sheathed thermocouple inserted into...More than 40 kinds of selected minerals and compounds were individually irradiated by microwaves under an inert atmosphere,and the temperatures of samples were measured with a metal-sheathed thermocouple inserted into the samples directiy.The results indicated that most sulphide and some oxide minerals and compounds could be heated to high temperatures in a short timet whereas the common gangue minerals,some oxide and oxy-salt minerals or compounds could not.The sulphide minerals had faster heating rate than the oxide minerals containing the same cations.The impurities of minerals had significant effect on the heating rate.The selective heating characteristics of microwaves on different minerals and compounds could be attributed to the differences between their conductivities or dielectric loss factors and bonding properties.展开更多
文摘目的:探讨高危型人乳头状瘤病毒(high-risk human papilloma virus,HR-HPV)多重感染在宫颈鳞状细胞病变中的分布特点及临床意义,为宫颈病变的诊断、治疗以及预防性接种疫苗提供新的理论依据。方法:收集2011至2015年39331例女性患者的宫颈HPV分型检测、液基细胞学(liquid based cytology,LCT)检查及部分宫颈活检诊断结果,分析HR-HPV多重感染与宫颈鳞状细胞病变患者的临床病理特征的关系。结果:在39331例患者中,HR-HPV多重感染者768例,年龄为(38.10±10.28)岁,2重感染及3重感染主要集中在21~50岁,4重以上感染主要集中在21~40岁。应用卡方检验进一步分析可以发现,2重感染、3重感染和4重以上感染在各年龄组的分布存在差异(χ^2=23.80,P=0.008);卡方检验风险分析显示,人群中HR-HPV多重感染增加宫颈鳞状细胞学异常发病的风险(OR=1.32,P=0.01);Spearman等级相关分析显示HR-HPV多重感染与宫颈鳞状细胞病变级别呈正相关(P=0.01)。结论:HR-HPV多重感染增加了宫颈癌前病变的发生及癌变风险,在诊断、治疗和预防宫颈病变时,应重点参考HR-HPV的多重感染情况。
文摘【目的】比较3个杨树品种移栽后的生长特性,揭示一些杨树品种移栽造林后生长缓慢的原因。【方法】以欧美107杨(Populus×euramericana‘74/76’)、小美旱杨(Populus popularis Hsü(1-0))和毛白杨1316(Populus tomentosa‘1316’)3个杨树品种为对象,2017年在观测全植株历经1个生长季后的地径、树高基础上,于2017-08-01和2017-09-14分别测定根、茎、叶生物量和叶面积,并于2017-08-30测定净光合速率和叶绿素含量(SPAD值),比较其相对生长速率(RGR)、净同化速率(NAR)、比叶面积(LSA)等指标。【结果】1)移栽1个生长季后,3个杨树品种地径、树高和生物量(包括茎、叶及植物整体)均表现为欧美107杨显著高于小美旱杨和毛白杨1316。2)欧美107杨相对生长速率显著高于小美旱杨和毛白杨1316,欧美107杨和毛白杨1316的平均叶面积均显著高于小美旱杨;三者净同化速率间差异显著,表现为小美旱杨>欧美107杨>毛白杨1316;小美旱杨和毛白杨1316的同化产物向茎的分配比例显著低于欧美107杨。3)欧美107杨和毛白杨1316的总叶面积、单叶面积和比叶面积均显著大于小美旱杨;三者叶片数量差异显著,表现为小美旱杨>欧美107杨>毛白杨1316;欧美107杨和小美旱杨的净光合速率和SPAD值均显著高于毛白杨1316。【结论】不同杨树品种生长特性取决于自身遗传特性,且移栽后生长缓慢的机制存在一定差别。
基金Supported by the National Natural Science Foundation and National Nonferrous Metals Industry Corporation of China。
文摘More than 40 kinds of selected minerals and compounds were individually irradiated by microwaves under an inert atmosphere,and the temperatures of samples were measured with a metal-sheathed thermocouple inserted into the samples directiy.The results indicated that most sulphide and some oxide minerals and compounds could be heated to high temperatures in a short timet whereas the common gangue minerals,some oxide and oxy-salt minerals or compounds could not.The sulphide minerals had faster heating rate than the oxide minerals containing the same cations.The impurities of minerals had significant effect on the heating rate.The selective heating characteristics of microwaves on different minerals and compounds could be attributed to the differences between their conductivities or dielectric loss factors and bonding properties.
