目的:探究血清中细胞因子白细胞介素-1β(IL-1β)含量与广西肝癌流行区壮、瑶族肝癌家族聚集性的关系。方法:在广西肝癌流行地域收集肝癌高发120例作为实验组,选择近似相同生活背景、民族、HBsAg、性别、年龄相距±5岁的120例无癌...目的:探究血清中细胞因子白细胞介素-1β(IL-1β)含量与广西肝癌流行区壮、瑶族肝癌家族聚集性的关系。方法:在广西肝癌流行地域收集肝癌高发120例作为实验组,选择近似相同生活背景、民族、HBsAg、性别、年龄相距±5岁的120例无癌家族成员为对照组,应用酶联免疫吸附(ELISA)技术检测两组共240例受检者外周血清 IL-1β含量。结果:不管从总体水平还是从民族、HBsAg携带情况、性别、年龄层面进行对比分析,实验组IL-1β含量均明显高于对照组,差异有统计学意义( P 均<0.05)。实验组中,先证者不同级别亲属之间IL-1β的含量差别无统计学意义(Z=1.648, P =0.642)。实验组中有 2~3 个肝癌先证者与有4个及以上肝癌先证者的家族成员外周血IL-1β含量相比较,差异无统计学意义(Z=-1.331, P =0.183)。结论:实验组入选者血清IL-1β因子检测含量明显高于对照组,促炎因子IL-1β高水平表达与广西的壮、瑶族肝癌家族聚集性存在关联性,IL-1β过量表达可能是肝癌高发家族成员罹患肝癌的易感因素之一。展开更多
The binding constant（KDOM） of pyrene onto different molecular weight（Mw） fractions of a dissolved organic matter（DOM） extract from an estuarine sediment was measured via a fluorescence quenching method,and the p...The binding constant（KDOM） of pyrene onto different molecular weight（Mw） fractions of a dissolved organic matter（DOM） extract from an estuarine sediment was measured via a fluorescence quenching method,and the possible binding mechanisms were discussed.The influence of water chemical parameters on pyrene binding was studied to elucidate the effects of DOM steric conformation.DOM fraction with larger M w（14000） showed a greater KDOM（2.02×10 5） than that with smaller Mw did,and the KDOMs were 1.16×105 and 1.13×105 for the fractions with M w of 1000―14000 and 1000,respectively.The K DOM s of different M w DOM fractions were correlated positively with the atomic ratio of C/H and absorbance at 280 nm;while a negative correlation existed between K DOM and（O＋C）/N（atomic ratio）,and K DOM and O-containing groups.These correlations indicate the positive influence of aromatic structure and the negative effect of polarity on DOM binding capacity.Infrared spectroscopy revealed that specific interactions existed between pyrene and the DOM fraction with larger M W besides hydrophobic partition,i.e.,NH-π interaction in DOM moiety（1000―14000） and π-π electron donor acceptor（EDA） forces in DOM moiety（14000）.KDOM varied in a complex pattern with increasing cation concentration and pH,which could be explained by the change in DOM steric conformation.Formed aggregates favored the lipophilic partition of pyrene.However,the accessibility to some interior binding sites became low when the aggregate was too large,leading to a reduced KDOM.展开更多
We have produced ultracold polar RbCs molecules via photoassociation starting from laser-cooled 85Rb and 133Cs atoms in a dual−species,forced dark magneto-optical trap.The formed electronically excited RbCs∗molecules ...We have produced ultracold polar RbCs molecules via photoassociation starting from laser-cooled 85Rb and 133Cs atoms in a dual−species,forced dark magneto-optical trap.The formed electronically excited RbCs∗molecules correlated to the Rb(5S_(1/2))+Cs(6P_(1/2))dissociation limit are observed by trap loss spectroscopy.Following the decay of these excited RbCs*molecules,the formed ground state molecules are directly ionized by a two-photon single-color pulse dye laser,which is a new ionization mechanism for ground state RbCs molecules and thence detected by time-of-flight mass spectroscopy.展开更多
文摘目的:探究血清中细胞因子白细胞介素-1β(IL-1β)含量与广西肝癌流行区壮、瑶族肝癌家族聚集性的关系。方法:在广西肝癌流行地域收集肝癌高发120例作为实验组,选择近似相同生活背景、民族、HBsAg、性别、年龄相距±5岁的120例无癌家族成员为对照组,应用酶联免疫吸附(ELISA)技术检测两组共240例受检者外周血清 IL-1β含量。结果:不管从总体水平还是从民族、HBsAg携带情况、性别、年龄层面进行对比分析,实验组IL-1β含量均明显高于对照组,差异有统计学意义( P 均<0.05)。实验组中,先证者不同级别亲属之间IL-1β的含量差别无统计学意义(Z=1.648, P =0.642)。实验组中有 2~3 个肝癌先证者与有4个及以上肝癌先证者的家族成员外周血IL-1β含量相比较,差异无统计学意义(Z=-1.331, P =0.183)。结论:实验组入选者血清IL-1β因子检测含量明显高于对照组,促炎因子IL-1β高水平表达与广西的壮、瑶族肝癌家族聚集性存在关联性,IL-1β过量表达可能是肝癌高发家族成员罹患肝癌的易感因素之一。
基金Supported by the National Natural Science Foundation of China(Nos.20737002,41073087)
文摘The binding constant（KDOM） of pyrene onto different molecular weight（Mw） fractions of a dissolved organic matter（DOM） extract from an estuarine sediment was measured via a fluorescence quenching method,and the possible binding mechanisms were discussed.The influence of water chemical parameters on pyrene binding was studied to elucidate the effects of DOM steric conformation.DOM fraction with larger M w（14000） showed a greater KDOM（2.02×10 5） than that with smaller Mw did,and the KDOMs were 1.16×105 and 1.13×105 for the fractions with M w of 1000―14000 and 1000,respectively.The K DOM s of different M w DOM fractions were correlated positively with the atomic ratio of C/H and absorbance at 280 nm;while a negative correlation existed between K DOM and（O＋C）/N（atomic ratio）,and K DOM and O-containing groups.These correlations indicate the positive influence of aromatic structure and the negative effect of polarity on DOM binding capacity.Infrared spectroscopy revealed that specific interactions existed between pyrene and the DOM fraction with larger M W besides hydrophobic partition,i.e.,NH-π interaction in DOM moiety（1000―14000） and π-π electron donor acceptor（EDA） forces in DOM moiety（14000）.KDOM varied in a complex pattern with increasing cation concentration and pH,which could be explained by the change in DOM steric conformation.Formed aggregates favored the lipophilic partition of pyrene.However,the accessibility to some interior binding sites became low when the aggregate was too large,leading to a reduced KDOM.
基金by the National Key Fundamental Basic Research Program of China(2006CB921603)Major Program of the National Natural Science Foundation of China(10934004)+2 种基金the National Natural Science Foundation of China(60978018,60808009,61008012,and 60978001)the New Teacher Fund of Ministry of Education of China(200801081021)NSFC Project for Excellent Research Team(Grant No 60821004).
文摘We have produced ultracold polar RbCs molecules via photoassociation starting from laser-cooled 85Rb and 133Cs atoms in a dual−species,forced dark magneto-optical trap.The formed electronically excited RbCs∗molecules correlated to the Rb(5S_(1/2))+Cs(6P_(1/2))dissociation limit are observed by trap loss spectroscopy.Following the decay of these excited RbCs*molecules,the formed ground state molecules are directly ionized by a two-photon single-color pulse dye laser,which is a new ionization mechanism for ground state RbCs molecules and thence detected by time-of-flight mass spectroscopy.
