Analysis of factors influencing elevated blood pressure and overweight/obesity and their comorbidities among Tibetan middle school students in Lhasa City / 中国学校卫生

Objective@#To explore the prevalence of elevated blood pressure and overweight/obesity and their comorbidities among Tibetan middle school students in Lhasa, and to analyze their association with lifestyle and other factors, so as to provide a basis for the intervention measures targeting elevated blood pressure, overweight and obesity among middle school students in high altitude area.@*Methods@#Using a stratified cluster random sampling method in September 2021, a total of 1 488 Tibetan junior and high students from Lhasa City were investigated with blood pressure measurement, physical examination and questionnaire survey. The influencing factors of elevated blood pressure, overweight and obesity and their comorbidities association were analyzed by multivariate Logistic regression.@*Results@#The prevalence of elevated blood pressure, overweight/obesity and their comorbidities were 17.8%, 17.4% , 5.0% respectively. Multivariate Logistic regression analysis showed that age( OR =0.81), residence, body mass inex(BMI) and gender were the influencing factors of elevated blood pressure; and the risks of elevated blood pressure in female students were higher than male students ( OR =1.89), suburban students were higher than urban students ( OR =8.06), overweight and obesity groups were higher than normal groups ( OR =2.55, 2.87) ( P <0.05). Adjusting for confounding factors such as gender, residence and school, and BMI (only for elevated blood pressure), daily screen time ≥2 h was positively correlated with elevated blood pressure, overweight/obesity and its comorbidities ( OR =1.56, 1.59 , 2.51) ( P <0.05).@*Conclusions@#The prevalence of elevated blood pressure, overweight/obesity are relatively high in Lhasa. Longer screen time is a common factor affecting with elevated blood pressure, overweight/obesity and comorbidities among Tibetan students. Measures should be taken intervene in the lifestyle of Tibetan students, in order to reduce elevated blood pressure and overweight/obesity.

Mechanism of Chinese Medicine Against Angiogenesis in Lung Cancer： A Review / 中国实验方剂学杂志

Lung cancer is a malignant tumor with high incidence and high mortality， posing a great threat to human health. Neovascularization may be one of the important mechanisms of lung cancer. The growing lung cancer cells can obtain necessary nutrients from the newly formed blood vessels， thereby causing the spread and metastasis of lung cancer. Nowadays， anti-angiogenic drugs are commonly used in western medicine in addition to surgery，radiotherapy， chemotherapy， and immunotherapy. However， the resulting adverse reactions such as thrombosis， hypertension， diarrhea， and cardiotoxicity have seriously affected the quality of life of patients. As the recognition of angiogenesis deepens， the selection of lung cancer treatment options has become a research hotspot and difficulty in the field of lung cancer treatment. In traditional Chinese medicine（TCM）， angiogenesis is believed to fall into the category of “collateral disease”. The invasion of external pathogens and deficiency of healthy Qi will cause visceral dysfunction， which can be gradually followed by Qi obstruction and blood stasis and phlegm-turbidity congesting the collaterals. As a result， the collateral function will be damaged， providing favorable conditions for the occurrence of lung cancer. More and more modern studies have confirmed that TCM is able to inhibit angiogenesis in the lung cancer， thereby resisting the tumor. In addition， by virtue of the unique advantages， TCM effectively reduces adverse reactions， enhances the efficacy， and improves the living conditions of patients. Moreover， it can synergize with other western medicine therapies in the treatment of lung cancer， exhibiting a wide application prospect. This paper summarizes the mechanisms of TCM in inhibiting angiogenesis of lung cancer reported in relevant experimental research， hoping to provide reference for the optimization of clinical treatment strategies for lung cancer.

Effect of different concentrations of moxa smoke exposure on nasal mucosal injury and expression of serum IL-1, IL-6 and TNF-α in rats / 中国针灸

OBJECTIVE@#To observe the effect of long-term moxa smoke exposure of different concentrations on olfactory function in rats, and provide experimental basis of safety study of moxa smoke produced by moxibustion.@*METHODS@#Forty SD rats were randomly divided into a normal control group, a low-concentration moxa smoke group, a moderate-concentration moxa smoke group and a high-concentration moxa smoke group, 10 rats in each one. The rats in the moxa smoke groups were put into three plexiglass moxibustion boxes with different moxa smoke concentrations, 4 hours per times, twice a day for 90 days. The general state of rats was evaluated before and during the experiment. After the intervention, the olfactory function was evaluated by two-bottle experiment (TBE); the morphology of nasal mucosa was observed by HE staining; the apoptosis of olfactory epithelial cells in nasal mucosa was detected by TUNEL method; the serum levels of interleukin-1 (IL-1), interleukin-6 (IL-6) and tumor necrosis factor-α (TNF-α) were detected by ELISA method.@*RESULTS@#In the late stage of moxa smoke exposure (45-90 days into intervention), the behavioral activity of rats in the moderate-concentration moxa smoke group and the high-concentration moxa smoke group was weaker than that in the normal control group, and their response to stimulation was strong, and their mental state was worse. After intervention, the drinking rate of vinegar-water mixture in the moderate-concentration moxa smoke group and the high-concentration moxa smoke group was higher than that in the normal control group and the low-concentration moxa smoke group (@*CONCLUSION@#The long-term exposure to low, moderate and high concentrations of moxa smoke could cause pathological changes in nasal mucosa and increase the serum levels of IL-1, IL-6 and TNF-α; the moderate and high concentrations of moxa smoke exposure could cause a series of damage to olfactory function and reduce olfactory sensitivity in rats.

Analysis of Related Early Warning Indexes of Cytokine Release Syndrome in Multiple Myeloma Patients after CAR-T Treatment / 中国实验血液学杂志

OBJECTIVE@#To investigate the relationship between the levels of ferritin, C-reactive protein (CRP), lactate dehydrogenase (LDH) and interleukin-6 (IL-6) in peripheral serum and cytokine release syndrome (CRS) in patients with relapse and/or refractory multiple myeloma (R/R MM) after receiving chimeric antigen receptor T cells (CAR-T) immunotherapy.@*METHODS@#Twenty-eight patients with R/R MM were treated with 1×10@*RESULTS@#Among the 28 patients, 27 cases (96.4%) developed CRS, 24 cases (85.7%) in 1-2 grade CRS and 3 cases (10.7%) in 3-5 grade. The severity grade of CRS of 27 patients was positively correlated with the peak values of ferritin, CRP, LDH, and IL-6 in peripheral blood (r@*CONCLUSION@#After receiving CAR-T cellular immunotherapy, the incidence of CRS in patients with R/R MM is higher, but most of them are in grade 1 or 2. The severity of CRS is positively correlated with the levels of ferritin, CRP, LDH and IL-6 in peripheral blood.

Profiling of HAT1-mediated Lysine Acetylation Modification in Liver Cancer / 中国生物化学与分子生物学报

Lysine acetylation has emerged as one of the most important post-translational modifications that participates in various biological and pathological processes. Histone acetyltransferase 1 (HAT1) as the first identified protein ε-amino lysine acetyltransferase is able to regulate the acetylation of histones and non-histone proteins. However‚ the acetylation substrates and sites mediated by HAT1 in liver cancer are poorly understood. In this study‚ we demonstrated that HAT1 was highly expressed in the liver cancer tissues‚ which was negatively associated with the prognosis of patients. Based on the establishment of the HAT1-knockout HepG2 cell line‚ we employed a quantitative proteomics approach to study the profiling of acetylation mediated by HAT1 in HepG2 cells. Interestingly‚ we identified a total of 858 Kac sites on 547 proteins in the HepG2 cell line‚ in which HAT1 mediated the levels of Kac of 74 sites on 68 proteins. The pathways and metabolic processes that were affected by HAT1-dependent acetylation modification were analyzed by bioinformatics. The results show that Kac regulates disease development‚ RNA biology‚ spliceosome and nucleosome assembly‚ oxidative stress‚ various signaling pathways and metabolic pathways‚ etc.. Moreover‚ we verified that the HAT1-mediated acetylation modification could promote abnormal lipid metabolism. CCK8 assays‚ clone formation and Edu assays revealed that HAT1 could remarkably enhance the cell proliferation of liver cancer in vitro. Thus‚ our finding explored the profiling of HAT1-mediated protein acetylation in HepG2 cells‚ which provides new insights into the underlying mechanism by which HAT1 mediates the development of liver cancer. Clinically‚ the HAT1-mediated acetylation sites could be used for the precise targets of drug development.

PCNA Confers the Conversion of Hepatitis B Virus Relaxed Circular DNA to Covalently Closed Circular DNA by Its DNA Binding Domain / 中国生物化学与分子生物学报

Chronic hepatitis B virus (HBV) infection is a primary cause for liver cancer. And the main challenge of curing hepatitis B is the elimination of the stable covalently closed circular DNA (cccDNA) of the viral genome. The formation of HBV cccDNA requires the filling of single-stranded region and the ligation of nicks in relaxed circular DNA (rcDNA) strands. Previously, our group reported that proliferating cell nuclear antigen (PCNA) was involved in the formation of HBV cccDNA. However, the underlying mechanism of the conversion of HBV rcDNA to cccDNA is poorly understood. In the present study, we aim to explore the mechanism by which PCNA contributes to the conversion of HBV rcDNA to cccDNA. Our data showed that PCNA was involved in the process of HBV rcDNA repair. The knockout of PCNA by the CRISPR/Cas9 system remarkably blocked the conversion of HBV rcDNA to cccDNA, while the ectopic expression of PCNA could effectively rescue the event (P<0. 001). Knockout of PCNA significantly slowed down the conversion kinetics of HBV rcDNA to cccDNA (P<0. 01). Mechanically, the DNA binding domain of PCNA was required for the process of HBV rcDNA repair to cccDNA (P<0. 01). Thus, we conclude that PCNA confers the conversion of HBV rcDNA to cccDNA by its DNA binding domain. Clinically, PCNA might serve as a novel target for antiviral therapy.

Role of penehyclidine in acute organophosphorus pesticide poisoning / 世界急诊医学杂志（英文）

BACKGROUND@#Penehyclidine is a newly developed anticholinergic agent. We aimed to investigate the role of penehyclidine in acute organophosphorus pesticide poisoning (OP) patients.@*METHODS@#We searched the Pubmed, Cochrane library, EMBASE, Chinese National Knowledge Infrastructure (CNKI), Chinese Biomedical literature (CBM) and Wanfang databases. Randomized controlled trials (RCTs) recruiting acute OP patients were identified for meta-analysis. Main outcomesincluded cure rate, mortality rate, time to atropinization, time to 60% normal acetylcholinesterase (AchE) level, rate of intermediate syndrome (IMS) and rate of adverse drug reactions (ADR).@*RESULTS@#Sixteen RCTs involving 1,334 patients were identified. Compared with the atropine-or penehyclidine-alone groups, atropine combined with penehyclidine significantly increased the cure rate (penehyclidine+atropine vs. atropine, 0.97 vs. 0.86, RR 1.13, 95% CI [1.07–1.19]; penehyclidine+atropine vs. penehyclidine, 0.93 vs. 0.80, RR 1.08, 95% CI [1.01–1.15]) and reduced the mortality rate (penehyclidine+atropine vs. atropine, 0.015 vs. 0.11, RR 0.17, 95% CI [0.06–0.49]; penehyclidine+atropine vs. penehyclidine, 0.13 vs. 0.08, RR 0.23, 95% CI [0.04–1.28]). Atropine combined with penehyclidine in OP patients also helped reduce the time to atropinization and AchE recovery, the rate of IMS and the rate of ADR. Compared with a single dose of atropine, a single dose of penehyclidine also significantly elevated the cure rate, reduced times to atropinization, AchE recovery, and rate of IMS.@*CONCLUSION@#Atropine combined with penehyclidine benefits OP patients by enhancing the cure rate, mortality rate, time to atropinization, AchE recovery, IMS rate, total ADR and duration of hospitalization. Penehyclidine combined with atropine is likely a better initial therapy for OP patients than atropine alone.

Dynamic Changes of Trace Elements in Yu Salvia miltiorrhiza in Different Growth Periods / 中国实验方剂学杂志

Objective:To establish an atomic absorption spectrometry to determine the content of eight trace elements of Yu Salvia miltiorrhiza in different growth stages，namely K，Cu，Na，Mg，Fe，Zn，Ca and Mn. Method:Micro-digestion-atomic absorption spectrometry was used to determine the trace elements in the roots of Yu S. miltiorrhiza. The HPLC method was used to determine the content of active constituents of Yu S. miltiorrhiza. Principal component analysis and correlation analysis were used to evaluate the results. Result:The contents of trace elements in Yu S. miltiorrhiza in different growth periods were significantly different. Cu had a significant positive correlation with the growth period，while Zn，Ca and Mn had significant negative correlations with the growth period. The comprehensive score of Yu S. miltiorrhiza in December was the best. The content of index components was negatively correlated with Mn，Zn and Ca，and positively correlated with Cu，Fe and Na. In soil，Mg，Fe，Ca and Mn were correlated with Zn，Ca and Mn，while Mn was negatively correlated with Cu. The content of K and Mg in the crude drug increased gradually with the change of the growth period，and the overall score of annual Yu S. miltiorrhiza was the best. Conclusion:The change of trace elements in Yu S. miltiorrhiza in different periods has certain regularity. Trace elements in soil have impacts on trace elements in medicinal materials. Trace elements in medicinal materials are closely correlated with index components and quality of medicinal materials.

Change and relationship between Gli1 and β-catenin on rats' bone formation with chronic fluorosis / 中华病理学杂志

To investigate the change and association of glioma-associated oncogene homolog 1 (Gli1) and β-catenin on bone formation in rats with chronic fluorosis which were inhibited by cyclopamine (Cycl). Forty-eight Sprague-Dawley rats were evenly divided to four groups, including control, F, F+Cycl and F+DMSO groups. The control group were fed with tap water (NaF1 ppm). The F, F+Cycl and F+DMSO groups were exposed to NaF (50 ppm) in drinking water as the chronic fluorosis model. Then the rats in F+Cycl or F+DMSO groups were injected by Cycl or DMSO after 6 months, respectively. Urine fluoride concentration was detected using fluorine ion selective electrode. The enzyme-linked immunosorbent assay (ELISA) was used to detect bone alkaline phosphatase (BALP). Bone tissues were stained with hematoxylin-eosin. The mRNA and protein expression of Gli1 and β-catenin in bone tissue were detected using real-time PCR, immunohistochemistry and Western blot. Compared with the controls, the urine fluoride concentration and the width and volume of bone trabeculae were increased in the F, F+Cycl and F+DMSO groups, but no statistical difference among the 3 fluorosis groups. The concentration of BALP was increased in the F group and decreased in F+Cycl group (0.05). The expression of Gli1 and β-catenin mRNA and protein was higher in the F and F+Cycl groups than controls, but lower in the F+Cycl group than in the F group. There was positive correlation between the expression of Gli1 and β-catenin (0.476, 0.05). The expression of Gli1 and β-catenin was also associated with BALP concentration and volume of bone trabeculae, respectively (0.457, (2)0.466, 0.581, 0.554, respectively, 0.05 for all). The expression of Gli1 can be inhibited by Cycl. It may be involved in the bone formation of rats with chronic fluorosis. It may also affect the expression of β-catenin, which is an osteogenesis factor.

Chemical constituents from root barks of Dictamnus dasycarpus and their cytotoxic activities / 中国中药杂志

Nineteen compounds, including kihadanin D (1), obacunone (2), kihadanin A (3), kihadanin B (4), kihadanin C (5), limonin (6), evodol (7), fraxinellone (8), furo[2,3-b]quinolin-4-ol (9), preskimmianine (10), ifflaiamine (11), dictamnol (12), naringenin (13), diosmetin (14), wogonin (15), scopoletin (16), cleomiscosin A (17), apocynin (18), and methyl pyroglutamate (19), were isolated from the methanol extract of the root barks of Dictamnus dasycarpus by using various column chromatographies. Their chemical structures were extensively determined on basis of UV, IR, NMR, MS, and CD spectroscopic data analyses. Among them, 1 is a new limonoid, 9 was isolated from plant kingdom for the first time, 11, 13-14 and 17-19 were obtained from the genus Dictamnnus for the first time. Cytotoxicities of compounds 1-18 were tested, and the results indicated that 1 exhibited cytotoxicities against three human cancer cell lines MDA-MB-231, A549 and HT29 with IC₅₈ values of 16.22, 21.72 and 31.06 μmol·L⁻¹, respectively.

Chemical and cytotoxic constituents of Zanthoxylum nitidum / 中国中药杂志

Ten compounds were isolated from the methanol extract of Zanthoxylum nitidum through silica gel, Sephadex LH-20, RP-18 and HPLC chromatography techniques. Their structures were elucidated by the MS and NMR spectra as zanthonitidine B(1), cyclo-(Leu-Leu-Leu-Leu-Ile)(2),6S-10-O-demethylbocconoline(3), liriodenine(4), isoplatydesmine(5), 5, 5'-dimethoxylariciresinol(6), syringaresinol (7), episyringaresinol (8), marmesin (9) and syringaldehyde (10). Among them,1 is a new alkaloid,2 is a cyclopentapeptide isolated from plant kingdom for the first time, and 3 is from the genus Zanthoxylum for the first time. Compounds 3 and 4 exhibited cytoxoxicity against three human cancer cell lines HT29, A549 and MDA-MB-231 with IC₅₈ values of 27.37, 24.10, 33.58 μmol·L⁻¹ and 9.12,6.05, 11.35 μmol·L⁻¹, respectively.

A study on quality of life and its influencing factors of drug addicts with methadone maintenance treatment in Wenzhou / 预防医学

Objective To analyze the quality of life status and its influencing factors of drug addicts with methadone maintenance treatment (MMT) in Wenzhou, in order to provide a basis for developing health service measures to improve their quality of life. Methods A total of 199 drug addicts with MMT in Wenzhou were investigated by the Quality of Life for Drug Addicts (QOL-DA) and Self-made questionnaire, influencing factors on quality of life were analyzed by multiple linear regression analysis. Results Most of 199 drug addicts with MMT were male, middle aged, local residents, lower educational level, and unemployed. Most of them used traditional drugs such as heroin by intravenous injection, and the proportion of who continually used drugs more than 10 years was 78.39%. The majority of them had abandoned drug habits many times. The proportions of abandoning drug habits more than 12 months this time and self-reported involving drug abuse related diseases were 77.39%, 61.81%, respectively. Scores of physical function and hunger sensory (PH), psychological spirit and self-esteem (PS), withdrawal syndrome and toxic effects (ST), social support and operational capability (SO) were 32.96±6.75, 33.03±5.96, 47.61±8.51 and 38.42±6.86, respectively. The total score of QOL-DA was 152.01±23.55. Marital status, occupation, age of first using drug, time of drug use and drug abuse related diseases were its influencing factors. Conclusion The quality of life of drug addicts with MMT is lower. Comprehensive health service measures for influencing factors should be taken to improve their quality of life.

Risk factors of neonatal tetanus in Wenzhou, China: a case-control study

Introduction：Neonatal tetanus is a major cause of neonatal mortality in many developing countries and remains a major public health problem. This study aimed to determine risk factors associated with neonatal tetanus in Wenzhou, China.Methodology：Medical records of neonatal tetanus cases from 17 hospitals over a 13-year period (2000–2012) were reviewed for potential risk factors. Controls were selected from neonates with diseases other than tetanus who were admitted to the same facility during the same period. The potential risk factors of the neonatal tetanus group were compared with the control group using univariate analysis and an unconditional logistic regression model.Results：A total of 246 neonates with tetanus and 257 controls were included in this study. Univariate analysis showed that having untrained birth attendants, home delivery, an unsterile method of delivery and being a migrant to Wenzhou were significantly different between the two groups (P < 0.001). Logistic regression analysis revealed that the odds of having an untrained birth attendant, home delivery and an unsterile method of delivery were significantly higher in the tetanus group than the control group (odds ratio: 1371.0; 95% confidence interval: 206.0, 9123.5).Conclusion：This study identified that the main risks of neonatal tetanus in cases from Wenzhou were having an untrained birth attendant, home delivery and an unsterile method of delivery. Preventive measures directed to these risk factors may reduce the occurrence of neonatal tetanus in the studied area.

Prognosis of 153 patients with decompensated hepatitis B virus-related cirrhosis is improved after 3-year continuous lamivudine treatment / 中华医学杂志(英文版)

<p><b>BACKGROUND</b>The long-term effectiveness and safety of lamivudine in patients with decompensated hepatitis B virus-related cirrhosis are still not clear. The present study attempted to describe the clinical outcomes of lamivudine therapy in these special patients over three years.</p><p><b>METHODS</b>This study was a retrospective, controlled cohort study which involved 153 patients with decompensated hepatitis B virus-related cirrhosis. Of these, 86 patients received lamivudine 100 mg daily accompanied with general internal treatment, and the other 67 were given general internal treatment only. Significant clinical responses were recorded after years of antiviral treatment.</p><p><b>RESULTS</b>The patients in both groups were matched in terms of age, sex and laboratory results at baseline. After years of therapy, the Child-Pugh-Turcotte scores and laboratory values of the patients receiving lamivudine were remarkably improved compared to the patients in the control group. The mortality rate and the incidence of cirrhosis-related complications were much lower in the lamivudine group than in the control group. Genotypic resistance tyrosine, methionine, aspartate, aspartate mutations developed in 26.7 percent of the patients during 3-year lamivudine treatment, and cirrhosis-related death and the hepatocellular carcinoma were more likely to occur in patients with these mutations than in the other patients who were treated with lamivudine.</p><p><b>CONCLUSIONS</b>Continuous long-term lamivudine treatment in patients with decompensated hepatitis B virus-related cirrhosis delays clinical progression, and significantly improves hepatic function and prognosis. However, the use of a retrospective control cohort precludes drawing definitive conclusions.</p>

Expression of calcineurin and nuclear factor of activated T cells 1 in testis of rats with chronic fluorosis / 中华预防医学杂志

<p><b>OBJECTIVE</b>To discuss the significance of calcineurin (CaN) and nuclear factor of active T cells 1 (NFATc1) in the damage mechanism of the testis of rats with chronic fluorosis.</p><p><b>METHODS</b>Eighteen clear class SD male rats, aging 6 week-old, were randomly divided into 3 groups, 6 rats in each. The rats of control group were fed with tap water (NaF < 1 mg/L) and the experimental rats were exposed to NaF (lower group: 5 mg/L, higher group: 50 mg/L) to established the chronic fluorosis model. After 8 months, we observed the occurrence of dental fluorosis among rats in different groups, and the contents of urine fluoride were detected by fluorine ion selective electrode method. The body of the rats were weighted as well as their testis. The testis tissues were stained with hematoxylin-eosin and observed under light microscope to find the morphological changes. The expression of CaN and NFATc1's protein and mRNA in testis were detected by Immunocytochemistry (IHC) and In-situ hybridization (ISH).</p><p><b>RESULTS</b>The number of rats which was found dental fluorosis were separately 0, 4 and 5 in control group, low dose group and high dose group (χ(2) = 10.60, P < 0.05). The contents of urine fluoride were gradually increased in control group, low group and high group, which were (1.26 ± 0.17), (2.06 ± 0.64) and (7.69 ± 1.96)mg/L, respectively (F = 36.57, P < 0.05). The body weight were significantly different in all three groups(629.00 ± 16.00), (585.17 ± 17.27), (560.50 ± 16.07)g, F = 26.67, P < 0.05) and the testis weight were without statistical difference ((2.58 ± 0.17), (2.43 ± 0.31), (2.35 ± 0.38)g, F = 0.91, P > 0.05). Compared with the control group, the testicular structures were damaged in the experimental groups and especially significant in high dose group. The expression of CaN (59.10 ± 5.62, 77.93 ± 4.16, 101.69 ± 6.31, F = 74.18, P < 0.05) and NFATc1's (76.11 ± 4.41, 93.42 ± 3.85, 120.42 ± 9.31, F = 92.4, P < 0.05) protein in testis tissues were increased by the fluorine concentration. The mRNA expression of CaN and NFATc1 were separately (CaN: 58.76 ± 7.70, 82.01 ± 6.88, 99.47 ± 8.33, F = 42.65, P < 0.05 and NFATc1: 59.39 ± 4.74, 90.02 ± 5.37, 121.15 ± 7.69, F = 155.47, P < 0.05). There were positive correlation between the expression of CaN and NFATc1's protein and mRNA expression (r = 0.899, r = 0.908).</p><p><b>CONCLUSION</b>The changes in the signaling pathway of expression of CaN may be involved in the injury mechanism of testis tissues of rats with chronic fluorosis.</p>

Complete genome sequence of Coxsackievirus B5 (CVB5/09) strain isolated in China and its phylogenetic analysis / 病毒学报

An outbreak of hand foot and mouth disease occurred in Shang dong, China in 2009. Almost 20% of patient's swabs was positive for Coxsackie virus B5 (CVB5) identified by RT-PCR and sequencing. It was suggested that CVB5 may be another important pathogen for HFMD. Fifteen pairs of overlapping primers were designed and the genome sequence was sequenced. The genome of CVB5 was 7 399 nt in length, coding for 2 185aa. The genome displayed 80.6%-85.3% nucleotide sequence identity and 96.1%-96.9% amino acid sequence identity with another three CVB5 respectively. Phylogenetic analysis showed that different segment of genome underwent a distinct evolutionary and selective pressure. Simplot analysis displayed no evident recombination between genome of CVB5 and other HEV B viruses. The complete and characterized genome of CVB5/09 provides further insight into the genetics of CVB5 and other HEV B viruses, aiding in the surveillance and control of HFMD.

Fibrotic remodeling of nasal mucosa in rat model after radiation injury / 中华耳鼻咽喉头颈外科杂志

<p><b>OBJECTIVE</b>To investigate the role of nasal mucosa fibrosis on radiation induced nasal mucosa injury.</p><p><b>METHODS</b>Seventy two male rats were randomly divided into two groups, control group and irradiation injured group (radiation dose were 40 Gy); the rats were killed 1 week, 2 weeks, 4 weeks, 8 weeks, 3 months and 6 months after the finish of radiation. The middle turbinates of the animals were removed. The pathological change of the nasal mucosa were observed with scanning electron microscope, transmission electron microscope, hematoxylin and eosin (HE), alcian blue-periodic acid-Schif (AB-PAS), and Masson Trichrome (MT). The Hyp content in nasal mucosa was measured with chemo-chromatometry.</p><p><b>RESULTS</b>After radiation, the pathological characteristics in early stage (within 4 weeks) was acute inflammatory reaction. The repair of nasal mucosa started 4 weeks after radiation, lasted to 6 months. The deposition of collagen in nasal mucosa could be found 1 week after irradiation and increased gradually.</p><p><b>CONCLUSION</b>Irradiation could induce a serials of pathological changes on nasal mucosa. The nasal mucosa fibrosis may be one of the reasons of persistent irradiation induced nasal mucosa injury.</p>

A new method for isolating CD34(+) cells based on complex of magnetic nanoparticles and antibody / 中国实验血液学杂志

The purpose of this study was to synthesize the complex of magnetic nanoparticles and antibody, and to apply them to isolate the CD34(+) cells from umbilical cord blood, then to evaluate its separation efficiency. The complex of magnetic nanoparticles and antibody was used to separate CD34(+) cells from umbilical cord blood in the outer magnetic field because of its superparamagnetism, specific identification and function of combination with CD34(+) cells. Scanning electron microscopy was used to observe the morphology of the separated CD34(+) cells. Flow Cytometer was applied to evaluate the sorting efficiency of magnetic nanoparticles, liquid culture and colony culture were taken to assay proliferation and differentiation capacity of the separated CD34(+) cells. The results showed that the CD34(+) cells from umbilical cord blood were isolated fast and effectively by the complex of magnetic nanoparticles and monoclonal antibody. Moreover, the isolated CD34(+) cells still maintained its normal morphology, highly proliferative and differentiative capacity. It is concluded that the complex of magnetic nanoparticles and monoclonal antibody has been successfully synthesized and developed as a technique which efficiently and quickly isolates CD34(+) cells from umbilical cord blood.

A new linearly-combined bi-exponential model for kinetic analysis of the isometric relaxation process of Bufo gastrocnemius under electric stimulation in vitro / 浙江大学学报（英文版）（B辑：生物医学和生物技术）

There was a slow-relaxing tail of skeletal muscles in vitro upon the inhibition of Ca(2+)-pump by cyclopiazonic acid (CPA). Herein, a new linearly-combined bi-exponential model to resolve this slow-relaxing tail from the fast-relaxing phase was investigated for kinetic analysis of the isometric relaxation process of Bufo gastrocnemius in vitro, in comparison to the single exponential model and the classical bi-exponential model. During repetitive stimulations at a 2-s interval by square pulses of a 2-ms duration at 12 V direct currency (DC), the isometric tension of Bufo gastrocnemius was recorded at 100 Hz. The relaxation curve with tensions falling from 90% of the peak to the 15th datum before next stimulation was analyzed by three exponential models using a program in MATLAB 6.5. Both the goodness of fit and the distribution of the residuals for the best fitting supported the comparable validity of this new bi-exponential model for kinetic analysis of the relaxation process of the control muscles. After CPA treatment, however, this new bi-exponential model showed an obvious statistical superiority for kinetic analysis of the muscle relaxation process, and it gave the estimated rest tension consistent to that by experimentation, whereas both the classical bi-exponential model and the single exponential model gave biased rest tensions. Moreover, after the treatment of muscles by CPA, both the single exponential model and the classical bi-exponential model yielded lowered relaxation rates, nevertheless, this new bi-exponential model had relaxation rates of negligible changes except much higher rest tensions. These results suggest that this novel linearly-combined bi-exponential model is desirable for kinetic analysis of the relaxation process of muscles with altered Ca(2+)-pumping activity.

Evaluation of a kinetic uricase method for serum uric acid assay by predicting background absorbance of uricase reaction solution with an integrated method / 浙江大学学报（英文版）（B辑：生物医学和生物技术）

A patented kinetic uricase method was evaluated for serum uric acid assay. Initial absorbance of the reaction mixture before uricase action (A(0)) was obtained by correcting the absorbance at 293 nm measured before the addition of uricase solution, and background absorbance (A(b)) was predicted by an integrated method. Uric acid concentration in reaction solution was calculated from A, the difference between A(0) and A(b), using the absorptivity preset for uric acid. This kinetic uricase method exhibited CV<4.3% and recovery of 100%. Lipids, bilirubin, hemoglobin, ascorbic acid, reduced glutathione and xanthine <0.32 mmol/L in serum had no significant effects. A linearly responded to 1.2 to 37.5 micromol/L uric acid in reaction solution containing 15 microl serum. The slope of linear response was consistent with the absorptivity preset for uric acid while the intercept was consistent with that for serum alone. Uric acid concentrations in clinic sera by different uricase methods positively correlated to each other. By Bland-Altman analysis, this kinetic uricase method accorded with that by quantifying the total change of UV absorbance on the completion of uricase reaction. These results demonstrated that this kinetic uricase method is reliable for serum uric acid assay with enhanced resistance to both xanthine and other common errors, wider range of linear response and much lower cost.