The biochemical control of the cell cycle by growth regulators in higher plants

The cell cycle is an important research field in cell biology and it is genetically and developmentally regulated in animals and plants. The aim of this study was to review knowledge about the biochemical regulation of the cell cycle by plant growth regulators through molecular checkpoints that regulate the transition from G0-G1-S-phase and G2-M in higher plants.Recent research has shown that zeatin treatment led to the up-regulation of CycD3 in Arabidopsis. Benzyladenine treatment can also shorten the duration of S-phase through recruitment of latent origins of DNA replication. Kinetin is involved in the phosphoregulation of the G2-M checkpoint; the major cyclin-dependent kinase (Cdk) at this checkpoint has recently shown to be dephosphorylated as a result of cytokinin treatment, an effect that can also be mimicked by the fission yeast Cdc25 phosphatase. Gibberellic acid (GA) treatment induces internode elongation in deepwater rice, this response is mediated by a GA-induced up-regulation of a cyclin-Cdk at the G2-M checkpoint. Recent evidence has also linked abscisic acid to a cyclin-dependent kinase inhibitor. A new D-type cyclin, recently discovered in Arabidopsis may have a key role in this process. A brief review on plant growth regulator-cell cycle interfacing during development and a cytokinin-induced continuum of cell cycle activation through the up-regulation of a plant D-type cyclin at the G1 checkpoint and the phosphoregulation of the Cdk at the G2/M checkpoint had been concluded. This review could be valuable to research on cell and developmental biology in plants.     

樟树幼林生物化学参数与高光谱遥感特征参数相关分析

高光谱遥感在植被研究中的应用使定量估算植被的生物化学参数和生物物理参数成为可能.分析了樟树幼林生物化学参数与高光谱特征变量之间的相关关系.结果表明:樟树幼林的大部分生物化学参数(叶绿素a含量、叶绿素b含量、叶绿素总含量、类胡萝卜素含量和总磷含量)与高光谱遥感特征参数(蓝边内最大的一阶微分、绿峰反射率、红边位置、蓝边面积、绿峰反射率和红谷反射率构成的比值与归一化植被指数、红边面积和蓝边面积构成的比值和归一化植被指数)之间的相关系数达到了0.01极显著性检验水平;纤维素、总氮含量与高光谱特征参数的相关系数没有达到显著性检验水平.因此,可以利用相关系数达到了0.01极显著性检验水平的高光谱特征参数建立樟树幼林生物化学参数的高光谱遥感估算模型.     

线上线下混合式"金课"建设实践与探索——以动物生物化学课程为例

随着互联网技术的发展,传统教育与信息化技术深度融合,线上线下混合式金课成为建设一流学科、一流专业的重要举措.以动物生物化学课程线上线下混合式"金课"建设为例,从搭建线上教学平台、教学互动和教学评价等方面进行了探索.     

Changes induced by osmotic stress in the morphology,biochemistry, physiology,anatomy and stomatal parameters of almond species （Prunus L. spp.） grown in vitro

We investigated the influence of different levels of osmotic stress on growth and development in selected wild almond species(eight Prunus spp.) grown in vitro. The study, while endorsing the efficacy of in vitro screening of auxiliary buds of wild almond for osmotic stress tolerance, showed species variability in its response to osmotic stress. Osmotic stress reduced growth and development of all the species. However, the putative tolerant Prunus spp. showed better performance than the putative susceptible genotypes. On average there was an 80% decrease in shoot dry weight at-1.2 MPa. Reduction in shoot weight was more common in osmotic stress-susceptible species in the section labeled ‘Euamygdalus'. The tolerant Prunus species produced smaller changes in biochemical responses than the sensitive cultivars for malondialdehyde content, catalase activity, relative permeability of protoplast membranes, and net photosynthetic rate. The tolerant species maintained cell integrity better than drought sensitive species. Wild almond species in the section labeled ‘Spartioides'(Prunus arabica(Olivier) Neikle, Prunus glauca (Browicz) A.E. Murray, Prunus scoparia Spach) and ‘Lycioides'(Prunus lycioides Spach, Prunus reuteri Bossi. et Bushe) were best adapted to osmotic stress. Increase in chlorophyll concentration and leaf thickness under high osmotic stress can be considered as preliminary selection parameters for osmotic stress tolerance in Prunus spp. The study confirmed the efficacy of the in vitro method for screening of large number of genotypes for osmotic stress tolerance in wild almond species.     

浅析《食品生物化学》课程教学存在的问题及对策

对石河子大学《食品生物化学》课程教学中存在的问题进行剖析,提出从教学计划修订、教学方法革新和专业素养进行课程改革,以期提高食品生物化学的教学质量。     

《生物化学》教学方法探讨

生物化学是当前高校教育中的一门重要课程。该文结合生物化学课程的特点,认真分析了当前生物化学教学中存在的问题,并针对这些问题提出了改进生物化学教学工作的具体方法,为提高生物化学课程教学质量,增强教学效果起到重要作用。     

青年教师提高动物生物化学理论教学效果的方法

动物生物化学是高等农业:校畜牧与兽医专业的一门必修专业基础课。针对该课程的特点并结合教学工作经验,阐述了提高动物生物化学理论教学的方法,以期为青年教师的教学工作提供借鉴。     

任务型教学法在生物化学教学中的应用

任务型教学法是基于建构主义理论的一种教学模式。该文针对中职农校生物化学教学中存在的问题，探讨了任务型教学法在生物化学教学中的任务设计原则和实施模式的构建。通过在教学实践中的初步探索与尝试，该文认为，任务型教学法注重知识的运用和学法的指导，强调教学中的师生互动和“在做中学”的理念，是一种以学生为主体的有利于学生全面发展的教学模式，比传统的教学法优势明显。     

高职院校生物化学实验教学改革探索与实践

对生物化学实验教学内容、教学条件、教学方法及考核体系等方面内容进行分析,指出在生物化学实验教学中,应结合培养技能型人才的高职高专培养目标,加强对学生思维能力、创新精神和动手能力的培养,以为高职院校生物化学实验教学提供参考。     

生物化学实验教学形成性评价体系构建的尝试

构建生物化学实验教学形成性评价体系,旨在优化实验教学评价体系,调动学生学习的主动性和积极性,及时反馈信息,改进教学中的不足,提高生物化学实验教学质量,实现形成性评价的价值。