在极低温下照射种子的生物学效应——Ⅳ.对辐射细胞学效应的观察

以微核测定法,对极低温(-196℃)和常温下照射材料的细胞学研究结果表明:极低温有保护效应,能减轻M_1代的生理损伤:辐射种子萌动芽尖间期细胞的微核率与M_2代某些性状突变率具有一定的相关性;极低温单因子处理种子亦可导致染色体畸变。该实验为阐明极低温对种子照射效应的影响提供了微观依据。     

完备的W—空间

本文研究了随机半度量空间的a.s压缩性质与依概率度量压缩性质,所得结论推广了相关文献的相应结论,并结合几个有趣的注记说明:随机度量空间体系比概率度量空间体系与通常的度量空间体系更能揭示空间更为精细和深刻的性质——随机度量性质。     

Analysis of antibiotics from liquid sample using electrospray ionization-ion mobility spectrometry

The recent findings of antibiotic residues in aquatic environment at trace level have gained much concern for the detrimental effect on ecological and human health due to bacterial resistance. Here, the feasibility of using electrospray ionization ion mobility spectrometry (ESI-IMS) for analysis antibiotics in liquid sample is demonstrated. Reduced mobilities and collision cross sections of 18 antibiotics are experimentally measured and compared with theoretical values according to mass-mobility correlation. Gentamicin is used as an example to investigate the capability of ESI-IMS for multi-component analysis of antibiotics. Mixtures of antibiotics at different concentrations are analyzed. The estimated detection limit for amoxicillin is 0.7 mg L⁻¹ (70 pg) and the linear range of response maintains over two orders. This method will be a potential technique for the analysis of antibiotics in aquatic environment.