Fibrinogen-to-albumin ratio predicts the outcome of patients with acute ischemic stroke receiving intravenous thrombolysis / 国际脑血管病杂志

Objective:To investigate the correlation and predictive value of fibrinogen-to-albumin ratio (FAR) and clinical outcomes after intravenous thrombolysis in patients with acute ischemic stroke.Methods:Patients with acute ischemic stroke received intravenous thrombolysis treatment at Fuyang People's Hospital from November 2019 to August 2022 were retrospectively included. Their clinical, imaging, and laboratory data were collected. After 3 months of onset, a modified Rankin Scale was used for clinical outcome evaluation and a score >2 were defined as poor outcome. Multivariate logistic regression analysis was used to determine the correlation between FAR and poor outcome. Receiver operating characteristic (ROC) curve was used to evaluate the predictive value of FAR on adverse outcomes after intravenous thrombolysis in patients with acute ischemic stroke. Results:A total of 162 patients were included. There were 114 patients (70.4%) in the good outcome group and 48 (29.6%) in the poor outcome group. Univariate analysis showed that the baseline National Institutes of Health Stroke Scale (NIHSS) score, fasting blood glucose, fibrinogen, and FAR in the poor outcome group were significantly higher than those in the good outcome group, while the serum albumin was significantly lower than that of the good outcome group (all P<0.05). Multivariate logistic regression analysis showed that the baseline NIHSS score (odds ratio [ OR] 1.176, 95% confidence interval [ CI] 1.082-1.227; P<0.001), fasting blood glucose ( OR 1.206, 95% CI 1.018-1.430; P=0.030), and FAR ( OR 1.448, 95% CI 1.449-1.824; P=0.002) were the independent risk factors for poor outcome. The ROC curve analysis showed that the area under the curve of FAR for predicting poor outcomes was 0.706 (95% CI 0.616-0.796). When the FAR cutoff value was 8.06, the sensitivity and specificity were 66.7% and 78.2%, respectively. Conclusion:There is a significant correlation between FAR and outcomes after intravenous thrombolysis therapy in patients with acute ischemic stroke. Higher FAR has certain predictive value for poor outcomes of patients.

Expert consensus on gastrointestinal dysfunction secondary to sepsis with integrating Traditional Chinese Medicine and Western medicine / 中华危重病急救医学

Acute gastrointestinal dysfunction is a common and important complication of sepsis. As no exiting formal definition and classification of gastrointestinal dysfunction, most of the treatment strategies for gastrointestinal dysfunction are not based on clinical evidence, but on their own clinical experience. Experts of traditional Chinese medicine, integrated traditional Chinese and Western medicine and Western medicine from various disciplines in Shanghai are organized by the Shanghai Society of Integrated Traditional Chinese and Western Medicine and the Emergency Department Branch of Shanghai Physicians Association. After repeated discussion, literature search and formulation of the outline, we developed consensus on gastrointestinal dysfunction secondary to sepsis with integrating Traditional Chinese Medicine and Western medicine by consulting extensively on clinical experts in the fields of emergency medicine, gastroenterology, general surgery, infectious medicine and traditional Chinese medicine, and holding several expert forums and consultation meetings. This clinical expert consensus focused on acute gastrointestinal injury (AGI) classification and inducer of sepsis. In this consensus, the common symptoms, diagnosis, classifications, treatment strategies and suggestions of acute gastrointestinal injury or dysfunction secondary to sepsis were explored from the aspect of both Traditional Chinese Medicine and Western medicine.

Cellular endocytosis and exocytosis of soluble uranium and its damage to HK-2 cells / 中国辐射卫生

Objective To investigate the endocytosis and exocytosis of soluble uranium in human kidney proximal tubular epithelial (HK-2) cells and the cytotoxicity after uranium exposure. Methods Cell Counting Kit-8 assay was used to determine the cell viability after different concentrations of uranium exposure, and optical microscopy and transmission electron microscopy were used to observe the changes in cells after uranium exposure. Inductively coupled plasma mass spectrometry was used to monitor the endocytosis and exocytosis of uranium over time by cells. Flow cytometry was used to assess the changes in cell cycle and apoptosis after uranium exposure. Results After uranium exposure, HK-2 cells showed dose-dependent damage; cell cycle was arrested in G1 phase; cell apoptosis and necrosis occurred; cell proliferation was inhibited. The content of endocytic uranium increased gradually within 24 h, and there was a threshold for uranium endocytosis, while the fraction of uranium binding to cell surface was low (< 0.2%). Over 40% of the endocytic uranium would be exocytosed within 1 h. Uranium could form needle-like precipitates in both intracellular and extracellular areas after uranium exposure. Conclusion After uranium exposure, cells show decreased viability, cell cycle arrest, and cell apoptosis. The process of endocytosis and exocytosis of soluble uranium is very rapid. HK-2 cells can convert soluble uranium into non-toxic precipitates.

Transcriptome analysis of mild hypothermia protection against radiation / 中南大学学报(医学版)

OBJECTIVES@#To analyze the differentially expressed genes (DEGs) with radiation-induced rat lung injury, and to reveal the protective mechanism for mild hypothermia in the radiation-induced lung injury in rats at the transcriptome level.@*METHODS@#A total of 10 male SD rats aged 6-8 weeks were randomly divided into 2 groups to establish a rat model of radiation-induced lung injury, and one group was treated with mild hypothermia. RNA was extracted from left lung tissue of each group, and sequenced by BGISEQ-500 platform. Significance analysis of DEGs was carried out by edgeR software. Gene ontology (GO) function enrichment analysis and Kyoto Encyclopedia of Genes and Genomes (KEGG) pathway enrichment analysis were used to analyze the gene function. Then 5 key DEGs were verified by real-time reverse transcription PCR (real-time RT-PCR).@*RESULTS@#There were 2 790 DEGs (false discovery rate<0.001, |log@*CONCLUSIONS@#The DEGs and pathways related to mild hypothermia protection against radiation-induced lung injury in rats are obtained, which provides an experimental basis for the protection of mild hypothermia against radiation-induced lung injury.

Analysis of a case with heterozygous 14q12 deletion and FOXG1 gene-related disease / 中华医学遗传学杂志

OBJECTIVE@#To describe the clinical and genetic characteristics of a child with 14q12q13.1 deletion involving the FOXG1 gene.@*METHODS@#Clinical manifestation of the child was analyzed. Peripheral blood sample of the patient was subjected to chromosomal karyotyping and single nucleotide polymorphism array (SNP-array) analysis.@*RESULTS@#The male infant has developed feeding difficulty, poor sucking, lower limb tremor, and frontal bruising 8 days after birth. Magnetic resonance imaging revealed significant enlargement of bilateral ventricles and corpus callosum dysplasia. Chromosomal analysis revealed a karyotype of 46,XY,del(14)(q12q13.1), and SNP-array confirmed that there was a 9.6 Mb deletion in 14q11.2q13.1, which encompassed the FOXG1 gene.@*CONCLUSION@#For patients with brain development abnormalities, dyskinesia, cognitive impairment, speech disorder and other manifestations, copy number variation of the FOXG1 gene should be excluded. SNP-array should be carried out as early as possible to attain the diagnosis.

FDA guidelines for preclinical evaluation of radiopharmaceuticals / 中华核医学与分子影像杂志

Preclinical evaluation is related to the clinical safety of radiopharmaceuticals.There are different research foci on preclinical evaluation of different radiopharmaceuticals.This article summarizes the Food and Drug Administration (FDA) preclinical evaluation guidelines of diagnostic and therapeutic radiopharmaceuticals,in order to provide reference for domestic research and preclinical evaluation of radiopharmaceuticals.

Diurnal rhythm of fetal heart rate in third trimester of pregnancy / 中华妇产科杂志

Objective To investigate the diurnal rhythms of fetal heart rate in third trimester of pregnancy. Methods From June 2014 and October 2017,97 cases of low-risk pregnancy women who received antenatal care and deliveried in Peking University Third Hospital were collected. Totally 130 cases of fetal heart rate and maternal holter monitoring data were analyzed. All cases were singleton pregnancy, cephalic position and had normal perinatal outcome. They were divided into three groups based on gestational age, 29 cases(22.3%,29/130)in pregnancy 28-33+6weeks, 37 cases(28.5%,37/130)in 34-36+6weeks, and 64 cases (49.2%, 64/130)in 37-40+6weeks. Fetal heart baseline (FHB), fetal heart baseline variation (FHBV), fetal heart rate acceleration area and maternal heart rate were acquired by computer, their diurnal rhythms and the differences among three groups were analyzed. Results FHB、FHBV、fetal heart rate acceleration area and maternal heart rate all presented diurnal rhythms.(1)FHB rose in daytime and decreased at night with the minimum value at 2:00-5:00, and didn′t decline further at night with the advancing of gestational age(P=0.548).(2)FHBV was similar to FHB, which rose in daytime and decreased at night, but declined smaller at night with the advancing of gestational age, especially after 37 weeks (P<0.01).(3)Fetal heart rate acceleration area reduced in daytime and enlarged at night, and enlarged more with the advancing of gestational age.(4)The diurnal rhythm of maternal heart rate was consistent with fetal heart rate. FHB lagged behind maternal heart rate for 1-2 hours when declining to the nocturnal nadir but been basically in sync with maternal heart rate when recovered. Conclusion The basic characteristics of fetal heart rate in normal pregnancy exist obviously diurnal rhythms, and change in different trends with the advancing of gestational age.

Clinical application evaluation of serum C1q and other complement factors in the diagnosis and prediction of preeclampsia / 中华检验医学杂志

Objective To observe the levels of serum complement C 1q, C3, C4 and factor B in different phases during normal pregnancy;To evaluate the diagnostic value and the predictive value of serum complement C1q, C3, C4 and factor B in preeclampsia (PE).Methods Three groups of subjectes were enrolled from January 2017 to March 2018 in Department of Obstetrics and Gynecology , Peking University Third Hospital.(1) 30 pregnant women in each group at 8-14 weeks, 20-26 weeks and 28-36 weeks were retrospectively selected , and the serum levels of complement C 1q, C3, C4 and B factors were measured and compared.(2)Selecting 17 cases of early-onset mild PE, 47 cases of early-onset severe PE, 24 cases of late-onset mild PE, 27 cases of late-onset severe PE, and 30 normal pregnant cases of the same gestational stage as early-onset /late-onset controls , through ANOVA analysis and comparison between two groups , this study evaluated the diagnostic value of serum complement C 1q, C3, C4 and factor B in PE.(3)To evaluate the predictive effect in PE, it analyzed serum C1q and factor B levels of pregnant women at 20-26 gestation weeks through prospective nested case-control study of 214 cases.Results The levels of serum C1q remained stable in the whole pregnancy .The levels of C3 and factor B increased at the early stage of pregnancy and remained stable after the middle stage .C4 increased early in pregnancy and then remained stable.Compared with the control group , the levels of serum C1q in all four types of PE patients were significantly decreased ( median: 169 mg/L, 161 mg/L, 165 mg/L, 163 mg/L;early-onset, late-onset control group:187 mg/L, 194 mg/L;U=130.500, 426.500, 159.500, 130.500, all P<0.05).Serum C3 levels of all the other three types of PE patients were significantly lower than those of the control groups (median:1170 mg/L, 1323 mg/L, 1223 mg/L;early-onset, late-onset control groups: 1438 mg/L, 1434 mg/L;U =379.000, 246.000, 160.000, all P <0.05 ), except for the early-onset mild PE (1275 mg/L).Serum C4 levels of patients with early/late onset severe PE were significantly lower than those of the control groups ( median: 140 mg/L, 142 mg/L;early-onset, late-onset control groups:223 mg/L, 235 mg/L;U =329.500, 136.500, both P <0.001 ) .Serum factor B levels showed no statistical difference among 3 early on-set groups or among 3 late on-set groups ( early-onset group median:332 mg/L,318 mg/L,early-onset control group 312 mg/L;late-onset group median:316 mg/L,314 mg/L, late-onset group 303 mg/L;χ2 =5.990, 1.77, all P>0.05).33 (15.4％) cases developed PE out of 214 pregnant women with PE risk factors .Compared to those who didn′t develop PE , it showed no statistical difference of serum C1q, C3, C4, and factor B levels at 20-26 gestational weeks of the women who subsequently developed PE ( C1q:175 mg/L vs.184 mg/L; C3:1523 mg/L vs.1467 mg/L; C4:230 mg/L vs.229 mg/L;FB:344 mg/L vs.320 mg/L;U=2090.000, 1575.000, 2058.500, 1362.000, all P>0.05).Compared to those of the healthy pregnant controls , it showed no statistical difference of serum C1q, C3 and C4 levels of 20-26 gestational weeks of the women who subsequently developed PE (C1q:175 mg/L vs.190 mg/L; C3:1523 mg/L vs.1428 mg/L; C4:230 mg/L vs.227 mg/L; U=353.000, 395.000, 493.500, all P >0.05),while it showed statistical difference (344 mg/L vs.306 mg/L;U=233.500, P=0.007) for factor B.Conclusions Serum C1q level of PE patients significantly decreased, which can be used as potential indicators of PE diagnosis , but serum C1q, C3, C4 level of 20-26 gestational weeks cannot predict risk of PE .Factor B cannot serve as serum index of PE diagnosis , but its serum levels at 20-26 gestational weeks werer higher than those of normal pregnant controls , factor B may be a potential predictor , but need further verification .

Introduction of radiopharmaceutical administration policy of FDA / 中华核医学与分子影像杂志

Radiopharmaceuticals have been widely used in the diagnosis, treatment and monitoring of diseases, and they play an important role in new drug development. Food and Drug Administration(FDA) has rich experience in the administration of radiopharmaceuticals. This article mainly interprets the regulato-ry policy of FDA for radiopharmaceuticals from the aspects of definition, regulations and registration, trying to provide reference for domestic research of radiopharmaceuticals.

Characteristics of long-range monitoring of fetal heart rate in third trimester with atypical non-stress test / 中华围产医学杂志

Objective To analyze the characteristics of long-range monitoring of fetal heart rate in the third trimester fetuses with atypical non-stress test (NST).Methods Long-range monitoring of fetal heart rate was performed in low-risk pregnant women who received antenatal care between April 2014 and October 2015 in Peking University Third Hospital.All subjects underwent NST from the 36th gestational week,and divided into normal NST (30 cases) and atypical NST (36 cases) groups according to the results of NST.The clinical data,including maternal age,gestational age at delivery,termination of pregnancy,neonatal asphyxia,hospitalization rate and umbilical cord blood peak-systolic/diastolic ratio value were collected.The data of long-range monitoring were analyzed by specially designed computer software.T test and Chi-square test were applied for statistical analysis.Results There were no differences in maternal age,gestational age at delivery,mode of delivery and incidence of neonatal asphyxia between the two groups (all P＞0.05).In atypical NST group,fetal heart rate baseline was higher [(138.05±5.65) vs (135.10±5.39) bpm] (t=-2.170,P＜0.05),and fetal heart rate baseline variability was lower than in normal NST group [(5.19±1.07) vs (6.28±1.15) bpm] (t=3.960,P＜0.001).Compared with normal NSTs,the percentage of mild baseline variability was significantly increased in atypical NST group [(40.79±9.97) vs (51.17± 10.84)％],while that of moderate variability was significantly decreased [(56.57±8.86) vs (46.72± 10.24)％] (t=-4.018 and 4.133,both P ＜ 0.001).In atypical NSTs,the average ratio of time of acceleration/the whole time of monitoring [(37.41 ±4.60)％] and acceleration area per unit time[(1.42±0.48) cm2/20 min] were decreased compared with normal NSTs [(40.78±4.23)％ and (2.03±0.67) cm2/20 min] (t=3.079 and 4.359,both P＜0.05).Conclusions Long-range monitoring of fetal heart rate in the third trimester fetuses with atypical NST is characterized by the declined fetal heart rate baseline variability,increased proportion of mild variability and unit time acceleration area;but these are not associated with pregnancy outcomes and short-term prognosis.

The effect of Rhubarb associated preparations on sepsis patients with acute gastrointestinal dysfunction:a Meta-analysis of randomized controlled study / 中国中西医结合急救杂志

ObjectiveTo evaluate the effect of Rhubarb associated preparations (rhubarb or prescriptions of traditional Chinese medicine including rhubarb) on sepsis patients with acute gastrointestinal dysfunction (AGI).Methods The retrieval of databases from libraries including PubMed, Medline, Cochrane Central Register of Controlled Trials, CNKI, CBMdisc, Wan Fang Database, VIP database were searched to identify randomized controlled trials (RCTs) about Rhubarb associated preparations for treatment of sepsis patients with AGI from the foundation of the various databases to March 2016. And in the mean time, the references of the studies accepted were also retrieved. The retrieving and screening of literatures were performed independently by two researchers, the methodological quality and data extraction of the enrolled literatures were assessed by Jadad scale, and Cochrane Collaboration 5.3 software was used to perform Meta analyses to observe the effects of rhubarb associated preparations on gastrointestinal function score, acute physiology and chronic health evaluation Ⅱ(APACHE Ⅱ) score and 28-day mortality in sepsis patients with AGI; the bias of published literatures was evaluated by funnel plot.Results ① Finally, 16 studies involving 1 171 patients (610 in rhubarb preparation group and 561 in the control group) were identified and enrolled. 12 studies had a Jadad score ≥ 3 and 4 studies < 3. The random method was used in classification of groups in all the studies in which the intergroup baseline data being comparable was clearly indicated. The blind method was applied in 5 contained RCTs.② The results of Meta-analyses showed that rhubarb associated preparation could improve gastrointestinal function score [mean difference (MD) = -0.52, 95% confidence interval (95%CI) = -0.55 to -0.48, P < 0.000 01], reduce the APACHEⅡ score (MD = -3.66, 95%CI = -5.00 to -2.33,P < 0.000 01) and 28-day mortality [odds ratio (OR) = 0.46, 95%CI = 0.30 to 0.71,P < 0.000 01] compared with those in the control group, the differences being statistically significant. No publication bias was seen in 16 literatures containing RCTs from the funnel plot.Conclusions Compared with the control group, the rhubarb associated preparations combined with conventional theraph can significantly improve the gastrointestinal function score, reduce APACHE Ⅱ score and 28-day mortality of sepsis patients with AGI, which suggests the rhubarb associated preparations have better efficacy. In addition, the result of sensitivity analysis has not substantially changed the results of Meta-analysis.

Repetitive variable deceleration with a short interval in labor and neonatal acidosis / 中华围产医学杂志

Objective To discuss the relationship between repetitive variable deceleration with a short interval (RDSI) in labor and neonatal acidosis.Methods One hundred and seventy-seven electronic fetal heart monitoring (EFM) patterns within one hour preceding delivery in term singleton pregnancies were collected in Peking University Third Hospital between February 2011 to October 2013.Continued EFM were recorded before delivery.Analysis was conducted on general information of both mothers and babies,including pregnant complications,duration of labor,cord and placental factors,nature of amniotic fluid,Apgar score and neonatal cord blood gas.RDSI was defined as that over 50％ intervals between two decelerations (the end of the last deceleration to the beginning of the next one) ≤ 60 s which appeared repetitevly in a period of 20 minutes.Independent sample t test,rank sum test,Chi-square test and Fisher's exact test were applied for statistics and receiver operating characteristic curve was obtained from the information of those with RDSI.Results Twenty-four of the 177 women with RDSI were assigned to the study group (24 cases,13.6％) and the rest 153 cases without RDSI to the control group.Background information of women in the two groups was comparable according to the maternal age,gestational weeks at delivery and duration of labor (all P ＞ 0.05).The occurrence of meconium stained amniotic fluid in the study group was higher than that of the control group [16.7％ (4/24) vs 5.2％ (7/153),x2=5.204,P=0.045],while the pH and base excess value of the neonatal blood gas in the study group were lower [7.20 (7.13-7.28) vs 7.29 (7.25-7.33),Z=-4.490;-6.10 (-4.67 to-9.62) mmol/L vs-3.20 (-4.90 to-1.55) mmol/L,Z=-5.044;P ≤ 0.01] resulting a higher rate of neonatal acidosis [50.0％(12/24) vs 7.8％ (12/153),x2=31.456,P ＜ 0.01].No significant difference was found in the incidence of neonatal asphyxia between the two groups.The area under the curve was 0.774 (95％CI:0.579-0.969).Conclusion RDSI in labor might indicate a high risk of neonatal acidosis.

The effect of helicobacter pylori eradication by doxycycline,levofloxacin,bismuth potassium citrate combined ;with omeprazole / 中国基层医药

Objective To observe the effect and safety of helicobacter pylori eradication by doxycycline, levofloxacin,bismuth potassium citrate combined with omeprazole.Methods 240 patients who infected helicobacter pylori were selected,and were randomly divided into four groups:treatment group(doxycycline,levofloxacin,bismuth potassium citrate,omeprazole),control group A(doxycycline,levofloxacin,omeprazole),control group B(amoxicillin, clarithromycin,bismuth potassium citrate,omeprazole),control group C (amoxicillin,clarithromycin,omeprazole), 60 patients in each group.Helicobacter pylori eradication treatment for 7 days,patients with gastritis stop after the course of the treatment,peptic ulcer patients continue taking omeprazole 5 weeks after 7 days treatment.All patients stopped medicine 2 weeks accepted 14 carbon breath test.And adverse events were investigated.Results In the treatment group and the control group A,B,C,the helicobacter pylori eradication rates were 93.3%,80.0%,91.7%, 75.0%.Compared with group A,the treatment group helicobacter pylori eradication rate increased significantly(χ2 =4.61,P 0.05).Compared with the treatment group,group B had high inci-dence of oral odor(χ2 =6.56,P <0.05).Compared with the treatment group,group C had high incidence of oral odor (χ2 =5.46,P <0.05).Conclusion Doxycycline,levofloxacin,bismuth potassium citrate combined with omeprazole can improve the helicobacter pylori eradication rate significantly,and with low price,has little side effect,no need of penicillin skin test,can used for the patients poverty or allergic to penicillin.

Structure and function of a novel thermostable pullulanase / 生物工程学报

Research on novel pullulanase has major significance on the domestic industrialization of pullulanase and the breakdown of foreign monopoly. A thermophilic bacteria LM 18-11 producing thermostable pullulanase was isolated from Lunma hot springs of Yunnan province. It was identified as Anoxybacillus sp. by 16S rDNA phylogenetic analysis. Full-length pullulanase gene was cloned from Anoxybacillus sp. LM18-11. The optimum temperature of the pullulanase was between 55 and 60 degrees C with a half-life as long as 48 h at 60 degrees C; and its optimum pH was between 5.6 and 6.4. V(max) and K(m) of the pullulanase was measured as 750 U/mg and 1.47 mg/mL, which is the highest specific activity reported so far. The pullulanase crystals structure showed a typical alpha-amylase family structure. The N-terminal has a special substrate binding domain. Activity and substrate binding were decreased when the domain was deleted, the V(max) and K(m) were 324 U/mg and 1.95 mg/mL, respectively. The pullulanase was highly heterologous expressed in Bacillus subtilis by P43 promoter. The extracellular enzyme activity was 42 U/mL, which increased more than 40 times compared to the initial strain. This pullulanase has good application prospects.

Effects of mild hypothermia induced by pentobarbital sodium on hematology in male BALB/C mice / 中国比较医学杂志

Objective To observe the effects of mild hypothermia induced by pentobarbital sodium on hematology in male BALB/C mice.Method Healthy male BALB/C mice were divided randomly into two groups:control group ( C) and mild hypothermia group(M).The body temperature of the mild hypothermia group was maintained between 28℃ to 30℃( anal temperature ) for 4 hours induced by pentobarbital sodium injected intraperitoneally , then recover unaffected . Anal temperature, coagulation, electrolytes, and blood cell indexes were examined in 2, 24, 72 hours after treated by mild hypothermia;Control group was given equal volume of saline volume at constant temperature .Results The body temperature and coagulation in mild hypothermia group showed no significant difference compared with the control group ( P﹥0.05),but the concentration of K +and Na +in mild hypothermia group were higher than control group (P﹤0.01), the number of WBC in mild hypothermia group was lower than control group ( P﹤0.01或P﹤0.05 ) , and the RBC、HGB、MCH、MCHC in mild hypothermia group were lower than control group transiently (P﹤0.01或P﹤0.05).Conclusion Mild hypothermia induced by pentobarbital sodium affects some of hematological values in mice considerably .

Research on learning strategies for non stomatology undergraduates / 中华医学教育探索杂志

Objective To understand non stomatology undergraduates'strategies for learning stomatology and to study the reform on this course.Methods The learning strategies of 560 undergraduates majoring in clinical medicine from grade 2007 were investigated s and ten related factors like learning attitudes were investigated by learning strategies scale.Correlation analysis and linear regression analysis were applied to deal with research data.Results Most undergraduates were lack of strategies in learning stomatology.Related coefficient between 10 factors and academic scores ranged from 0.197 to 0.401,existing positive correlation(P＜0.05).Determination coefficients(R2)of attitude,motivation,time management and learning auxiliary means were 0.146,0.167,0.223and 0.122 respectively,which can be used to predict the scores of examination.Condusions Non stomatology undergraduates'strategies for learning stomatology is a vital factor influencing their academic scores.It's necessary for teachers to improve their teaching methods considering students'professional characteristics and learning strategies.

Effect of Mcl-1 antisense oligonucleotide on Hela cell biology and sensitivity of chemotherapy / 中南大学学报(医学版)

OBJECTIVE@#To explore the effect of myeloid leukemia-1 (Mcl-1) gene on the proliferation and apoptosis of Hela cells and the sensitivity of cervical cancer chemotherapy by antisense technology.@*METHODS@#Mcl-1 antisense oligonucleotide(AS-ODN)was transfected into Hela cells with lipofectamine 2000. The expression of Mcl-1 was analyzed by Western blot, the cell viability was detected by MTT assay, and apoptosis was evaluated by flow cytometry.@*RESULTS@#Mcl-1 AS-ODN arrested the cell cycle at G1/S,greatly inhibited the cell growth and induced apoptosis. The sensitivity of Hela cells on chemotherapy was low. There was obvious increase in the apoptosis rate by chemotherapy drugs and growth inhibition rate after inhibiting the expression of Mc1-1.@*CONCLUSION@#Mcl-1 AS-ODN can not only inhibit Hela cell proliferation and induce apoptosis, but also increase the sensitivity of chemotherapy. Mcl-1 may be a potential target gene for cervical cancer chemotherapy.

EEG signal classification based on EMD and SVM / 生物医学工程学杂志

The automatic detection and classification of EEG epileptic wave have great clinical significance. This paper proposes an empirical mode decomposition (EMD) and support vector machine (SVM) based classification method for non-stationary EEG. Firstly, EMD was used to decompose EEG into multiple empirical mode components. Secondly, effective features were extracted from the scales. Finally, the EEG was classified with SVM. The experiment indicated that this method could achieve good classification result with accuracy of 99 % for interictal and ictal EEGs.

Effects of heroin on regulation of painful perception in hippocampus neurons of rat / 中华行为医学与脑科学杂志

ObjectiveThe heroin-dependent animal model of rats was used to investigate the effects ofheroin on regulation of pain perception in the dorsal and ventral hippocampus of the heroin-dependent rats. Meth odsHeroin was injected subcutaneously twice a lay for 9 days according to the principle of daily increasing dose in the Sprague-Dawley rats. From the 10th day,rats were given heroin at dose of 27 mg · kg-1 once a day until the14th day, then the unit discharges of the dorsal and ventral hippocampus of rats were observed respectively afternoxious electric stimulation of the rat-tail by the extracellular single-unit recording with glass microelectrodes. ResultsWhen given noxious stimulation, most of the neurons in the dorsal hippocampus in the heroin-dependent ratswere unaffected(59.09％ ) ,whereas in the control rats ,the ratio of the neurons of the dorsal hippocampus affectedby noxious stimulation was about 66.67％, respectively(P ＜ 0.05 ). However,in the ventral hippocampus, the ratioof the neurons activated,inhibitory or unaffected was 20. 69％ ,41.38％ and 37.93％ from the control and was40.74％ ,33. 33％ and 25.93％ from the heroin group respectively with no significant difference between two groups (P ＞ 0.05 ) . ConclusionHeroin changed the regulation of pain perception in the hippocampus,primarily the dorsal hippocampus of rats.

Effect of liver cirrhosis on potency of propofol for sedation in rats / 中华麻醉学杂志

Objective To investigate the effect of liver cirrhosis on the potency of propofol for sedation in rats. Methods Fifty-eight male SD rats, aged 10-12 weeks, weighing 180-220 g, were randomly divided into 3 groups: control group (group C, n = 18), mild liver cirrhosis group (group M1, n =20) and severe liver cirrhosis group (group M2, n = 20). The model of liver cirrhosis was established using four factors described by Chen et al. After successful establishment of the model, propofol was injected intravenously. The dose of propofol was determined by up-and-down sequential method for loss of righting reflex. The dose of propofol was 5.912 mg/kg in the first rat and the ratio of the doses between the two consecutive rats was 0.85. ED50 of propofol was calculated using up-and-down sequential method. Results ED50 of propofol was significantly lower in group M1 and M2 than in group C and in group M2 than in group M1 ( P ＜ 0.05 or 0.01 ). Conclusion The liver cirrhosis can enhance the potency of propofol for sedation in rats.