ABSTRACT
Fluorosis is widely prevalent worldwide, and China is one of the countries with a high incidence of endemic fluorosis. In recent years, study on non skeletal damage caused by fluorosis, especially cardiovascular system damage, has gradually increased. Fluoride can cause cardio vascular arteriosclerosis, hypertension and other diseases, while cardiovascular disease have hidden and acute onset, and the mortality rate has increased year by year in recent years. At present, the mechanism of cardiovascular diseases caused by fluoride is not yet clear, and further clarification is needed. This article provides an overview of the effects of fluoride on cardiovascular diseases from three aspect: epidemiological investigation, animals experiment, and in vitro cell experiment. It categorizes and analyzes the pathogenesis, providing new ideas for the study of cardiovascular system damage caused by fluorosis.
ABSTRACT
Objective To construct the expression plasmid of human PAK4 gene and identify its recombinant protein expression.Methods Total RISA was extracted from human breast cancer MCF-7 cells.The hPAKA coding sequence was amplified by polymerase chain reaction (PCR) method and subcloned into pEBG vector.After the target region was sequenced.the plasmid was transfected into HEK293 cell line.The expression of the recombinant plasmid in HEK293 cells was proved by Western blot.Results hPAKA had been constructed into the expressing vector pEBG successfully.The length of the fragment was 1 800 bp,identified by restriction enzymes digestion.The expression of pEBG-hPAK4 fusion protein was detected by Western blot,with a molecular weight 94 KDa and was pulled down by Qutathione Sepharose 4B.Conclusion The recombinant plasmid was successfully cloned into eukaryotic expressing vector,and the expression of pEBG-hPAK4 fusion protein was identified and pulled down by Glutathione Sepharose 4B.
ABSTRACT
This paper aimed at exploring for a scientific method of clinical skill strength-ening training by comparison and analysis on the training examination results of 121 clinical students in Clinical College,Wuhan University of Science and Technology before practice.It was found that the examination achievements of check-up is the lowest in the whole items as a re-sult of lack of normative and precise operation,and style of study is a primary reason to impact class average achievements.Relevant measures are put forward.The study results are available to improve clinic teaching quality.
ABSTRACT
BACKGROUND: In the past, a lot of researches used one-time lead level in umbilical cord blood at birth for investigations,however, one-time lead level in umbilical cord blood at birth can not represent lead caused cumu lative injury to neonatal nervous system during the whole period of preg nancy. Lead in meconium is mainly from digestive juice secreted by fetal alimentary tract, exfoliative epithelia from neonatal intestinal tract and am niotic fluid and sebum cutaneum swallowed by fetus, which is excreted from the very start of pregnancy to 24 hours after birth of neonates and re flects the lead deposit in neonatal intestinal tract during the whole period of pregnancy. OBJECTIVE: To explore the relationship between neurobehavioral devel opment in neonates with intrauterine exposure to lead at low level and the lead level in umbilical cord blood (CBPb) and meconium (MPb). DESIGN: Take lead levels in umbilical cord blood and meconium as neonatal intrauterine exposure indicators and scores of neonatal neurobe havioral development as effect indicators, and descriptive analysis is used to evaluate the correlativity. SETTING: Wuhan University of Science and Technology; Laboratory of Occupation Disease and Epidemiology, Tongji Medical College, Huazhong University of Science and Technology; Wuhan First Metallurgical Con struction Company Hospital for Workers and Staff. PARTICIPANTS: A total of 103 cases of full-term and healthy neonates were selected as objects of observation. The neonates were born in Depart ment of Gynecology and Obstetrics, Wuhan First Metallurgical Constrction Company Hospital, Qingshan District of New Industrial District of Wuhan from January to October 1999. Their parents were agreed to participate in the study and filled in the questionnaire, and provided neonatal meconium and performed neonatal tests on schedule. METHODS: ① Collection and assay of sample: 5 mL umbilical cord blood were collected and reserved in refrigerator at -4 ℃. Meconium with in 24 hours after birth, with dry weight between 5 to 10 g was collected, the lead levels in umbilical cord blood and meconium were assayed with the method of graphite furnace atomic absorption spectroscopy. ② Group ing: The neonates were divided into two groups with high and low-exposure to lead based on the cutoff value of CBPb of 0.483 μmol/L and MPb of 127.78 mg/kg. ③ Neonatal neurobehavioral development examination: Neonatal neurobehavioral development examination method was used for examination 3 days before delivery. Meanwhile, self-designed questionnaire was used to conduct a survey in puerperas. MAIN OUTCOME MEASURES: ① Lead levels in neonatal umbilical cord blood and meconium. ② Scores of neurobehavioral development of neonates with different lead levels of umbilical cord blood and meconium. RESULTS: All the 103 cases of neonates entered results analysis. ①There was significant difference only in scores of neonatal behavioral neurological assessment (NBNA) and biological visual and auditory orientation reaction (BVAOR)between groups with high and low-exposure to lead in umbilical cord blood (P ＜ 0.05). However, there was no rank correlativity between lead level in umbilical cord blood and scores of NBNA,non-biological auditory orientation reaction (NBAOR), non-biological visual orientation reaction (NBVOR) and biological visual and auditory orientation reaction (NBVOR). ②here was significant difference in scores of NBNA,NBAOR, NBVOR and BVAOR between groups with high and low-exposure to lead in meconium (P ＜ 0.05-0.01). The lead level in meconium clearly correlated reversely with scores of NBNA, NBVOR and BVAOR.CONCLUSION: Lead level in meconium is more sensitively related to the scores of neonatal neurobehavioral development, which could be used as indicator for lead deposit in the fetal body during the period of pregnancy.
ABSTRACT
BACKGROUND: Logistic analysis of multi-ordered response-variable is used to probe into from another view the interrelationship between lead content in fetus faeces and neurobehavioral development under exposure to low-level lead in uterus.OBJECTIVE: To probe into multi-factors of neurobehavioral development in neonates and the sensibility.DESIGN: The total score of neurobehavior in neonates was taken as dependent variable and 24 indexes were as independent variables, such as induced factors, lead in umbilicus blood and lead in fetus faeces in questionnaire. Logistic progressive regression of multi-ordered response-variables was used in analysis and corresponding factors were screened at level of P=0.10.SETTING: Wuhan University of Science and Technology, Laboratory Room of Occupation Disease and Epidemic disease in Tongji Medical College of Huazhong University of Science and Technology and Occupation Hospital of China First Metallurgical Construction General Company.PARTICIPANTS: Totally 103 full-month borne and healthy neonates were randomized in Department of Gynecology of one occupation hospital in Qingshan District of New-type Industry Area of Huanhan City from January to October 1999 as the objects. The relatives agreed with topic research and questionnaire investigation and they provided neonatal faeces and received neonatal tests on time.off the umbilicus and preserved in freezing in refrigerator at -4 ℃. The faeces in 24 hours after birth was collected and the lead contents of umbilicus blood and faeces were assayed with graphite furnace atomic absorpBehavioral Neurological Assessment (NBNA) was used in examination on the 3rd day after delivery. Simultaneously, the self-designed questionnaire was adopted in the investigation for parturients. The questionnaire involved other possible factors of neonatal neurobehavioral development, including dependent variables, concerning to states of family, society, environment and health that affected neurological development in neonates and lead contents in umbilicus blood and faeces. Scores of neonatal neurobehavior were taken as response variables. Finally, the corresponding factors were screened.MAIN OUTCOME MEASURES: To screen the factors of neurobehavioral development of neonates.RESULTS: Totally 103 cases entered result analysis. Six factors were selected in the model, named pregnant weeks, the month of drug administration in pregnancy, hemoglobin, emotions in pregnancy, lead level in fetus faeces and drug administration.CONCLUSION: Neonatal neurobehavioral development was related to multiple factors. Good nutrient in pregnancy, long pregnant weeks and good emotions in pregnancy benefit neurobehavioral development of neonates. Drug administration during pregnancy is disadvantageous in neonatal neurobehavioral development, especially the medication at the early phase of pregnancy. The increased lead content in neonatal faeces does not benefit neonatal neurobehavioral development.