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1大亚湾核电站余氯排放对邻近海域环境的影响显示文摘对大亚湾核电站冷却水排放口及邻近海域海水中余氯污染状况进行了调查 ,结果表明 :余氯的含量为<0 0 1~ 0 0 4mg·L- 1 ,各季节平均水平为 0 0 1~ 0 0 2mg·L- 1 ,冬季较高。余氯在海水中的形态为化合态。选择若干养殖经济动物进行了余氯毒性胁迫试验。以 0 5为安全因子 ,余氯胁迫作用时间不超过 30min时 ,游离余氯对平鲷、黑鲷仔鱼的安全容许浓度约为 0 1 0mg·L- 1 ,对斑节对虾幼苗为 0 86mg·L- 1 ;余氯胁迫作用不超过 60min时 ,化合态余氯对平鲷、黑鲷仔鱼的安全容许浓度约为 0 30mg·L- 1 ,对斑节对虾幼苗约为 2 86mg·L- 1 。两种形态的余氯对合浦珠母贝受精卵卵裂都有抑制作用 ,游离态余氯的抑制作用比化合态强。由于核电站邻近水域余氯含量水平较低 ,尚不致对生态环境产生明显的影响。张穗 黄洪辉 陈浩如 彭云辉 王肇鼎 方正信 高红莲 2000海洋环境科学2000,19,2:26
2Protein Quality Control in Plant Organelles:Current Progress and Future Perspectives显示文摘The endoplasmic reticulum,chloroplasts,and mitochondria are major plant organelles for protein synthesis,photosynthesis,metabolism,and energy production.Protein homeostasis in these organelles,maintained by a balance between protein synthesis and degradation,is essential for cell functions during plant growth,development,and stress resistance.Nucleus-encoded chloroplast-and mitochondrion-targeted proteins and ER-resident proteins are imported from the cytosol and undergo modification and maturation within their respective organelles.Protein folding is an error-prone process that is influenced by both developmental signals and environmental cues;a number of mechanisms have evolved to ensure efficient import and proper folding and maturation of proteins in plant organelles.Misfolded or damaged proteins with nonnative conformations are subject to degradation via complementary or competing pathways:intraorganelle proteases,the organelle-associated ubiquitin-proteasome system,and the selective autophagy of partial or entire organelles.When proteins in nonnative conformations accumulate,the organellespecific unfolded protein response operates to restore protein homeostasis by reducing protein folding demand,increasing protein folding capacity,and enhancing components involved in proteasome-associated protein degradation and autophagy.This review summarizes recent progress on the understanding of protein quality control in the ER,chloroplasts,and mitochondria in plants,with a focus on common mechanisms shared by these organelles during protein homeostasis.Jing-Liang Sun Jin-Yu Li Mei-Jing Wang Ze-Ting Song Jian-Xiang Liu 2021Molecular Plant2021,14,1:4
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