钙及钙调素研究进展(Ⅰ)

解决细胞识别、细胞通讯、细胞代谢的调控、细胞增殖与细胞周期、细胞与抗病以及细胞对外界信号进行的持续反应维持等重大理论与实际问题。文中着重介绍了作为胞内信使的钙离子及其循环的重要意义、作为Ca~(2+)受体的胞内蛋白CaM的广泛性。作者认为CaM在细胞代谢调控中处于中心位置,对Ca~(2+)及其循环、第二信使系统CAMP和肌醇磷脂,甚致CGMP均有调节、协调作用;是调控细胞代谢的综合剂。     

根管治疗术一次法治疗慢性窦道型尖周炎临床观察

目的：探讨慢性窦道型尖周炎根管治疗术一次法临床疗效．方法：开髓、彻底清理根管内与窦道内坏死感染物和炎性分泌物。适当扩大根管2号-4号,用FC液烧灼并反复刮除窦道内增生的肉芽组织,直至新鲜创面为止。用复方替硝唑液冲洗根管,将替硝唑氢氧化钙剂捣入根管内。置牙胶尖按侧方加压完成根管充填．全部病例经3年追踪观察．结果：随访128例,无1例尖周出现窦道,其中5例因治疗后保护措施不力,已成残根。改作其他修复．结论：慢性窦道型尖周炎根管治疗术一次法替硝唑氢氧化钙糊剂联合牙胶尖周用于根管充填操作简便。节省时间,易于推广．     

2005～2007年武汉亚洲心脏病医院钙拮抗剂应用分析

目的:分析武汉亚洲心脏病医院钙拮抗剂应用情况及发展趋势.方法:对该院2005年~2007年钙拮抗剂的用药金额、用药频度、消耗金额进行统计.结果:钙拮抗剂的消耗金额呈上升趋势,氨氯地平的消耗金额最高,左氨氯地平和硝苯地平控释片的用药频度占前两位.结论:长效二氢吡啶类钙拮抗剂具有广阔的市场前景.     

Characterization of Arabidopsis calreticulin mutants in response to calcium and salinity stresses

As an important calcium-binding protein, calreticulin plays an important role in regulating calcium homeostasis in endoplasmic reticulum （ER） of plants. Here, we identified three loss-of-function mutants of calreticulin genes in Arabidopsis to demonstrate the function of calreticulin in response to calcium and salinity stresses. There are three genes encoding calreticulin in Arabidopsis, and they are named AtCRT1, 2, and 3, respectively. We found that both single mutant of crt3 and double mutant of crtl crt2 were more sensitive to low calcium environment than wild-type Arabidopsis. Moreover, crt3 mutant showed more sensitivity to salt treatment at germination stage, but tolerance to salt stress at later stage compared with wild-type plant. However, there was no obvious growth difference in the mutant crtl and crt2 compared with wild-type Arabidopsis under calcium and salt stresses. These results suggest that calreticulin functions in plant responses to calcium and salt stresses.     

Characterization of Arabidopsis calreticulin mutants in response to calcium and salinity stresses

As an important calcium-binding protein,calreticulin plays an important role in regulating calcium homeostasis in endoplasmic reticulum (ER) of plants.Here,we identified three loss-of-function mutants ofcalreticulin genes in Arabidopsis to demonstrate the function of calreticulin in response to calcium and salinity stresses.There are three genes encoding calreticulin in Arabidopsis,and they are named AtCRT1,2,and 3,respectively.We found that both single mutant of crt3 and double mutant of crtl crt2 were more sensitive to low calcium environment than wild-type Arabidopsis.Moreover,crt3 mutant showed more sensitivity to salt treatment at germination stage,but tolerance to salt stress at later stage compared with wild-type plant.However,there was no obvious growth difference in the mutant crt1 and crt2 compared with wild-type Arabidopsis under calcium and salt stresses.These results suggest that calreticulin functions in plant responses to calcium and salt stresses.     

The discovery of α-Klotho and FGF23 unveiled new insight into calcium and phosphate homeostasis

The traditional view of calcium homeostasis is that it is maintained by two essential reactions. First, changes in extracellular Ca²⁺ are sensed in several distinct cell types, stimulating the secretion of parathyroid hormone (PTH), 1,25(OH)₂ D and calcitonin in response to the body’s requirement. Second, these calcitropic hormones then act on the calcium-translocating cells of the kidney, bone, and intestine to restore calcium balance. Recent progress indicates that α-Klotho and fibroblast growth factor (FGF) 23 are key players that integrate the multi-step regulatory system of calcium homeostasis that rapidly adjusts the extracellular calcium concentration and continuously maintains its concentration within a narrow physiological range. α-Klotho and FGF23 are also found to be major players in the regulatory system of phosphate homeostasis. Here, the demonstration of the molecular functions of α-Klotho and FGF23 has recently given new insight into the field of calcium and phosphate homeostasis. Received 3 April 2008; received after revision 23 May 2008; accepted 5 June 2008     

高温热解医疗垃圾酸性气化气吸收实验研究

针对高温热解医疗垃圾产生含HCl有害尾气引起的环境问题,依据化合反应原理,提出钙基吸收高温气化气中HCl气体的吸收系统。通过自行搭建的实验台,测试了吸附剂CaO吸收高温气化气中HCl的效率。在定模拟气体体积比以及流量的实验条件下,讨论了CaO层数、CaO粒径、气化气温度、气化气水蒸气含量对CaO吸附剂脱氯性能的影响。实验结果表明,当CaO吸收剂层数为3层,CaO粒径为8mm,气化气温度为500℃,脱氯效率最高,可达98%;实验范围内,水蒸气含量越高越有利于HCl的吸收。新型脱氯吸收装置不仅可以高效吸收高温模拟气化气中HCl,而且结构简单,操作便利。     

拉西地平防治SD大鼠慢性常压缺氧性肺动脉高压

目的：探讨拉西地平（Lacidipine,La)防治慢性缺氧性肺动脉高压（CHPH）的效果和机制，方法：（1）建立SD大鼠CHPH模型，分单纯缺氧（H）组9只，缺氧中拉西增平（H＋La)组7只，另设正常对照（N）组9只及（N＋La)组5只，（2）于3周末对比观测各组大鼠的肺动脉平均压（mPAP)及肺组织病理；用原位杂交法检测肺血管平滑肌细胞（PVSMC）内内皮素A受体信使核糖核酸（ETA－R mRNA)表达水平，结果：拉西地平能有效阻抑缺氧所致mPAP升高及相应病理解剖变化，能抑制缺氧大鼠PVSMC内ETA－R mRNA的表达，结论：拉西地平能有效防治SD大鼠CHPH，La抑制H大鼠PVSMC内ETA－R mRNA的表达是其防治CHPH的重要机制。     

冀东地区越冬菠菜钙镁硫的吸收特性

越冬菠菜(唐山大叶)新鲜茎叶产量在92544kg/hm2水平下,平均每生产1000kg新鲜茎叶,植株需吸收Ca0.848kg,Mg0.561kg,S0.411kg,比例为1.00∶0.66∶0.48;3月2日～4月10日是植株吸收Ca,Mg,S的主要时期,分别占各自总吸收量的72.91%,62.74%,72.65%;收获时,植株吸收的Ca,Mg,S主要贮存在绿叶中。