AC900电解质分析仪两种试剂的应用比较

目的:比较两种试剂实验指标的一致性.方法:根据奥迪康AC900电解质分析仪的工作原理、性能要求、试剂成分等,配制A、B二种试剂,并在该仪器上与对比试剂对比应用.结果:两种试剂A液和B液各离子浓度,准确性、精密度,临床分析样品结果无显著性差异(P＞0.05).结论:自制试剂完全可以替代配套试剂.     

Morphological and biochemical responses of Oryza sativa L. (cultivar MR219) to ion beam irradiation

Objective

Heavy ion beam, which has emerged as a new mutagen in the mutation breeding of crops and ornamental plants, is expected to result in the induction of novel mutations. This study investigates the morphological and biochemical responses of Oryza sativa toward different doses of carbon ion beam irradiation.

Methods

In this study, the dry seeds of O. sativa were irradiated at 0, 20, 40, 60, 80, 100, and 120 Gy, followed by in-vitro germination under controlled conditions. Morphological and biochemical studies were conducted to investigate the morphological and physiological responses of O. sativa towards ion beam irradiation.

Results

The study demonstrated that low doses (10 Gy) of ion beam have a stimulating effect on the height, root length, and fresh weight of the plantlets but not on the number of leaves. Meanwhile, doses higher than 10 Gy caused reductions in all the morphological parameters studied as compared to the control samples. The highest total soluble protein content [(2.11±0.47) mg/g FW] was observed in plantlets irradiated at 20 Gy. All irradiated plantlets were found to have 0.85% to 58.32% higher specific activity of peroxidase as compared to the control samples. The present study also revealed that low doses of ion beam (10 and 20 Gy) had negligible effect on the total chlorophyll content of O. sativa plantlets while 40 Gy had a stimulating effect on the chlorophyll content. Plantlets irradiated between 40 to 120 Gy were shown to be 0.38% to 9.98% higher in total soluble nitrogen content which, however, was not significantly different from the control samples.

Conclusions

Carbon ion beam irradiation administered at low to moderate doses of 10 to 40 Gy may induce O. sativa mutants with superior characteristics.     

利福霉素产生菌906-43菌株的选育

用氮离子束辐照处理利福霉素产生菌地中海诺卡氏菌，再利用利福霉素浓度梯度产板培养，纯化和复筛，得到高产菌株906－43，较出发株产量提高17．5％。     

Parental Involvement in Children’s Learning: The Case of Cochlear Implantation—Parents as Educators?

Extensive research emphasises the importance of parental involvement for children’s learning and academic achievement. This paper reports from a Norwegian study researching parents’ experiences on follow-up after their child’s cochlear implantation. Within this context, parental involvement is suggested to be of major importance for the child’s language learning. The study explores the parents’ talk on their involvement in the child’s language after implantation. Data consist of 27 written parental accounts and interviews with 14 of these parents. The analysis shows the parents’ extensive involvement in the child’s language learning. The study brings into conversation how understandings of learning influence parental involvement, leading to implications for the parents and children involved. It addresses a need for debate on how parents can support children’s learning, whilst avoiding parenthood becoming a series of educational tasks.     

人工种植体即刻种植的临床运用

随着人工种植牙的不断广泛应用于临床并取得比较好的效果 ,目前种植体的植入方法正由过去的延期种植转向即刻种植 .笔者在近二年的人工种植体即刻种植 2 6例临床运用中观察体会到即刻种植技术与一般的种植技术相比 ,具有疗程短 ,费用低 ,骨损伤小 ,避免患者承受长期缺牙痛苦等特点 ,同时它能有效地解决拔牙后牙槽骨吸收导致骨量不足而使种植体植入困难或无法植入等问题 .本文就即刻种植临床应用方面的一些问题作一探讨     

国产分析仪器发展现状与对策分析——以国产离子色谱仪为例

为探讨我国科学仪器现状及未来发展,本文以国产科学仪器离子色谱仪为例,通过对其输液系统、进样 系统、抑制系统、检测系统等各组成部分性能进行分析,客观了解并认识国产科学仪器整体发展水平,揭示国产科学 仪器目前存在的核心问题,提出加强产-学-研-用相结合模式,加强科学仪器基础研究,开展国产科学仪器应用示范 是国产科学仪器未来发展必然之路。     

Cu~(2+)-Cu~(2+)离子对的电子顺磁共振谱

本文利用晶场理论中的点电荷-电偶极模型,从“孤立络离子”近似下Cu~(2+)的光学性质和磁学性质的研究出发,探讨了晶体中Cu~(2+)-Cu~(2+)离子间相互作用对电子顺磁共振谱(EPR)的影响。以Cu(detc)_2晶体为例,首次用SCF-d轨道理论,解释了前人没法定量解释的零场分裂现象,建立了考虑Cu~(2+)-Cu~(2+)间相互作用后自旋哈密顿参量和晶格参数间的关系,从而首次从理论上给出了从孤立络离子近似到存在离子间相互作用时晶体的EPR谱的统一解释。计算结果表明:对于Cu(detc)_2,考虑Cu~(2+)-Cu~(2+)对的影响后,g-因子不变(这与实验结果符合),而零场分裂主要是旋轨耦合、晶场对称性以及Cu~(2+)-Cu~(2+)对间交换作用联合作用的结果。并对所得结果进行了讨论。     

等离子体浸没N^＋离子注入豌豆种子的生理效应

报道了等离子体浸没Ｎ~＋注入豌豆种子后,引起幼苗过氧化物酶同工酶和酯酶同工酶的酶带数量和活性均起变化;过氧化物酶的变化与离子注入剂量有关．３５分钟处理的两种酶的同工酶酶谱变化最大．且种子萌发率明显下降．     

N+离子注入选育色素产生菌Monascus的研究

应用10 keV的N+离子注入,对产红色素红曲菌进行了诱变选育.在确定最佳注入剂量后,经过两轮离子注入诱变筛选,选育出1株高产突变株,红色素色价提高38.1%,且色调适宜.经传代培养,其高产性状能稳定遗传.对该菌株的发酵特性也进行了研究.     

N+离子注入选育色素产生菌Monascus的研究

应用 10keV的N+离子注入,对产红色素红曲菌进行了诱变选育。在确定最佳注入剂量后,经过两轮离子注入诱变筛选,选育出 1株高产突变株,红色素色价提高 3 8.1 %,且色调适宜。经传代培养,其高产性状能稳定遗传。对该菌株的发酵特性也进行了研究。