用鸡蛋壳制备醋酸钙的研究   总被引：2，自引：0，他引：2  

沈秀荣 《襄樊学院学报》2000,21(2):68-70

用鸡蛋壳制备醋酸钙的适宜条件为：鸡蛋壳完全分解需１０００℃烧１小时;中和反应时醋酸浓度在１５～１７ｍｏｌ·Ｌ＾－１为宜,且应过量０．０９ｍｏｌ。  相似文献   

Calcium antagonist prevents calcium flux induced necrosis and apoptosis in ischemic reperfusion of rat liver     

Pronobesh Chattopadhyay  Nevneet Verma  Anurag Verma  Gunjan Shukla  Arun Kumar Wahi 《Indian journal of clinical biochemistry : IJCB》2008,23(4):356-360

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Aquatic toxicity of di （2-eihylhexyl） phthalate to duckweeds   总被引：1，自引：0，他引：1  

徐刚  刘宁  吴明红  郭瑞云  周佳欣  施文彦  李发生 《上海大学学报(英文版)》2010,14(2):100-105

This study is concerned with the effects of di （2-ethylhexyl） phthalate （DEHP） on two kinds of duckweeds （Spirodela polyrhiza and Lemna minor）.The results indicate that DEHP has aquatic toxicity to Spirodela polyrhiza at 0.4 mg/L and to Lemna minor at over 0.1 mg/L by changing their physiologic-biochemical characteristics.The contents of duckweed chlorophyll and soluble protein decrease with increasing DEHP concentration after 7 d of exposure.DEHP shows the stimulating role in catalase （CAT） and superoxide dismutase （SOD） systems at relative low levels.At 0.01 mg/L and 0.005 mg/L,SOD activities of Spirodela polyrhiza and Lemna minor reach their peak values respectively,while CAT activity reaches its maximum value at 0.05 mg/L and 0.01 mg/L.When DEHP levels are too high,the protection enzyme system would be destroyed and plant growth is inhibited.The analysis of malondialdehyde （MDA） and Fourier transform infrared spectroscopy manifest that DEHP could affect the tested duckweeds by destroying its cell membranes,and Spirodela polyrhiza is more resistant to DEHP exposure than Lemna minor.  相似文献   

Biochemical Effects of Lead Exposure on Battery Manufacture Workers with Reference to Blood Pressure, Calcium Metabolism and Bone Mineral Density     

Nilima N. Dongre  Adinath N. Suryakar  Arun J. Patil  Indira A. Hundekari  Basavaraj B. Devarnavadagi 《Indian journal of clinical biochemistry : IJCB》2013,28(1):65-70

Lead is one of the most widely scattered toxic metals in the environment and used by mankind for over 9,000 years. Lead in the environment may be derived from natural or anthropogenic sources. In humans, lead can cause a wide range of biological effects depending upon the level and duration of exposure. The purpose of this study was to find out the effect of lead exposure on systolic and diastolic blood pressure, serum calcium, ionized calcium, phosphorus, parathyroid hormone and vitamin D and examine the overall effect of all these parameters on the bone mineral density of battery manufacture workers. For this study ninety battery manufacture workers were selected and divided in three groups depending upon duration of lead exposure. Group I—workers with duration of lead exposure 1–5 years, Group II—workers with duration of lead exposure 6–10 years and Group III—workers with duration of lead exposure more than 10 years. Each group consisted of thirty workers. Thirty age matched healthy control subjects were taken for comparison. Demographic, occupational and clinical data were collected by using questionnaire and interview. The venous blood samples were collected from the study groups and normal healthy control group. At the time of blood collection random urine samples were collected in amber coloured bottles. The biochemical parameters were estimated by using standard assay procedures. Statistical analysis of the data was done using independent student‘t’ test for parametric variables. Values were expressed as mean ± standard deviation (SD). P values of 0.05 or less were considered to be statistically significant. The blood lead levels and urinary lead levels of all workers were significantly increased (P < 0.001) in proportion to the duration of lead exposure as compared to controls. Systolic and diastolic blood pressure were significantly raised (P < 0.001) in all three study groups of battery manufacture workers as compared to controls. Serum Calcium, Ionized calcium, phosphorus were significantly decreased (P < 0.001) in all the three study groups. Serum vitamin D levels were lowered (P < 0.01) and serum PTH was increased (P < 0.01) in workers as compared to controls. The results of this study clearly indicate that the absorption of lead is more in these workers which adversely affects blood pressure, disturbs calcium and phosphorus metabolism which further impairs mineralization of bone resulting in decreased bone mineral density observed in these workers. Lead toxicity is still persistent in battery manufacture workers though they are using sophisticated techniques in these industries. There is a need to protect the workers from the health hazards of occupational lead exposure.  相似文献   

原子吸收光谱法测定水中钙的探讨   总被引：2，自引：0，他引：2  

乔梅琴  安孟华 《漯河职业技术学院学报》2006,5(2):14-16

叙述了原子吸收光谱法测定水中钙的过程中,主要干扰物对钙测定结果的影响,提出了消除干扰的方法,并对测定钙方法的精密度、准确度进行了实验。  相似文献   

增塑剂邻苯二甲酸二异辛酯的催化合成研究进展     

訾俊峰 《许昌学院学报》2007,26(2):43-45

综述了固体超强酸、无机盐、铌酸及固载杂多酸、钛酸四丁酯、对甲苯磺酸等催化剂催化合成邻苯二甲酸二异辛酯(DIOP)的方法.通过比较发现硫酸氢钠具有催化效果好、用量少、反应时间短、酯化率高和环境污染小等优点.  相似文献   

Distribution Equilibrium of o-Phthalic Acid and trans-Butenedioic in Water and Di-n-butyl Phthalate     

高正虹杨晓瑞  胡超权李江 《天津大学学报(英文版)》2006,12(5):350-354

* In recentyears, the solvent-based absorption sys-tem[1], in which di-n-butyl phthalate(DBP) is usedas the solvent recovering maleic anhydride, is beingdeveloped in China. The organic solvent (di-n-butylphthalate) needs to be washed by water to recycle it-self in the process of recovering maleic anhydride[2].This is a back extraction process involved in the pro-duction of maleic anhydride. The extraction efficiencydepends on the distribution coefficients of the organicsolutes,o-phthalic aci…  相似文献   

Interaction Between DEHP and Particulate in a Eutrophic Lake   总被引：2，自引：0，他引：2  

迟杰  刘华  季民 《天津大学学报(英文版)》2004,10(3):167-170

Characteristics of interaction between di-2-ethylhexyl phthalate(DEHP) and particulate in a eutrophic lake were studied in this paper. DEHP concentrations ranged from 89.9 to 247 μg/L with an average value of 146 μg/L in subsurface water (SSW) samples, and from 82.0 to 390 μg/L with an average value of 211 μg/L in water surface microlayer (SM) samples. The results indicate that there was only a weak correlation between the DEHP concentrations and suspended particulate material(SPM) concentrations in both SSW and SM,while the significant correlation between DEHP concentrations and chlorophyll a concentrations was found,which suggestes that DEHP was principally bound to phytoplankton in the eutrophic lake. Correlation between DEHP concentrations and total phosphor (TP) concentrations was also found in this investigation. Enrichment factors (EF) of DEHP in SM were in the range of 0.85 to 2.12 with an average value of 1.35..DEHP EFs were significantly related to the enrichment of chlorophyll a in SM. The results suggest that the enrichment of DEHP in SM of this eutrophic lake was mainly due to DEHP accumulation in phytoplankton and was controlled by distribution of phytoplankton between SM and SSW.  相似文献   

Effect of calcium and light on the germination of <Emphasis Type="Italic">Urochondra setulosa</Emphasis> under different salts     

Shaikh F  Gul B  Li WQ  Liu XJ  Khan MA 《Journal of Zhejiang University. Science. B》2007,8(1):20-26

Urochondra setulosa （Trin.） C.E. Hubbard is a coastal halophytic grass thriving on the coastal dunes along the Pakistani seashore. This grass could be useful in coastal sand dune stabilization using seawater irrigation. The purpose of this investigation was to test the hypothesis that Ca^2＋ （0.0, 2.5, 5.0, 10.0 and 50.0 mmol/L） alleviates the adverse effects of KC1, MgSO4, NaC1 and Na2SO4 at 0, 200, 400, 600, 800 and 1000 mmol/L on the germination of Urochondra setulosa. Seed germination was inhibited with increase in salt concentration with few seeds germinated at and above 400 mmol/L concentration. No seed germinated in any of the KC1 treatments. Inclusion of CaC12 substantially alleviated the inhibitory effects of all salts. Germination was higher under photoperiod in comparison to those seeds germinated under complete darkness. Among the CaC12 concentrations used, 10 mmol/L was most effective in alleviating salinity effects and allowing few seeds to germinate at 1000 mmol/L KC1, MgSO4, NaC1 and Na2SO4 solution.  相似文献   

金钱草不同部分对草酸钙结石小鼠肾脏骨桥蛋白表达的影响     

李静  梁圆  李立顺  时维静  贺绍君  刘德义 《安徽科技学院学报》2015,(2):1-5

目的:研究金钱草不同部分对草酸钙结石小鼠肾脏功能及其对肾脏组织中骨桥蛋白(OPN)免疫印迹表达的影响。方法:小鼠给予含1%乙二醇和1%氯化铵的饮水,造成小鼠草酸钙结石模型,同时分别给予金钱草石油醚部分、氯仿部分、乙酸乙酯部分、正丁醇部分、水相部分提取物,试验期42天,试验结束时,测定血清中尿酸、尿素氮和肌酐的含量,采用免疫印迹法(Western blotting)测定肾组织OPN蛋白表达水平。结果:各组小鼠血清中的尿酸含量差异均不显著;结石组尿素氮含量极显著高于对照组,金钱草氯仿、乙酸乙酯、正丁醇组尿素氮含量极显著低于结石组;结石组肌酐含量极显著高于金钱草石油醚、氯仿、乙酸乙酯、正丁醇、水相组;结石组肾组织中的OPN的表达显著高于对照组,金钱草氯仿、乙酸乙酯、正丁醇、水相组的OPN的表达均显著低于结石组。结论:金钱草的氯仿、乙酸乙酯和水相组分可降低结石小鼠血清中尿素氮和肌酐的含量,增强肾脏的代谢能力,金钱草氯仿、乙酸乙酯、正丁醇、水相组均能降低肾组织中的OPN的表达,产生抑制草酸结石的效果。  相似文献