Objective:To improve the longevity genetic research study design by applying self-organizing maps to select a control group for longevity study.Methods:This study included the Han population aged 90 years and above or less than 80 years who have died (control group) from the natural population-based cohort formed by the fusion of the Chinese Chronic Diseases and Risk Factors Surveillance in 2013 and the China Death Surveillance System. The subjects who died of injury, infectious diseases, parasitic diseases, and malignant tumors were excluded. The self-organizing maps method, with multiple iterations and self-organizing clustering, was used to select similar factors among the population aged 90 years and above and the control group, including demographic characteristics, diseases, living habits, social behaviors, and mental and psychological factors. The study used PLINK 1.9 software to evaluate the quality of whole genome sequencing and to conduct logistic regression of single nucleotide polymorphisms (SNPs) and longevity on autosomes. Q-Q plots were used to visualize the P value associated with SNPs and longevity. Results:There were 1 019 samples selected from the baseline of 177 099 survey participants for genome sequencing, including 517 in the longevity group and 502 in the control group. The longevity and the control groups are generally similar in smoking, drinking, diet, sleep duration, blood lipid level, and self-assessment oral health status but differ significantly in socio-economic status, physical activity time, BMI, and self-assessment health status. The whole genome sequencing results were controlled, and 4 618 216 SNPs were involved in association analysis. The Q-Q plot of longevity-related SNPs analysis results showed that the enrichment of P value 1e-4 was significantly lower than the expected P value, and significant signals were also detected among P<1e-7 regions. Conclusions:The self-organizing maps can comprehensively consider the influence of socioeconomic and behavioral risk factors and select longevity control samples among samples with actual age and cause of death in a large-scale natural population cohort to improve the efficiency of longevity genome association analysis. This study provides a methodological reference for nested case-control study sample selection from the large-scale natural population cohort.

Objective: Based on observational, longitudinal and intervention study of common diseases among students in Jiangsu Province, this paper presents the current progress of two year follow up of myopia cohort regarding the association between growth parameters with progression of myopia among children and adolescents in areas with rapid economic growth. Methods: This survey adopted the stratified cluster sampling method for school selection. The full automatic computer optometry (TOPCON RM800) was used to track myopia related parameters for all participants from 2019 to 2020 under the condition of mydriasis (compound topicamide eye drops). Relationship between growth parameters of children and adolescents and the incidence and progression of myopia was analyzed by using Cox regression multiple statistical model. Results: The myopia rates of students from grade 1 to grade 3 in 2019 were 5.4%, 21.5% and 37.3% respectively. After one year, the myopia rates of all school stages increased to 25.3%, 43.3% and 58.1% respectively( χ 2=53.59, 49.63, 32.52, P <0.01). The mean diopter of right eye and left eye after mydriasis were ( 0.30± 1.24/0.39±1.26)D in 2019 and (-0.33±1.54/-0.19±1.55)D in 2020, respectively based on Cox multiple regression results, age ( HR =1.21, 95% CI =1.09-1.34), naked eye vision ( HR =0.08, 95% CI =0.07-0.11), height ( HR =0.98, 95% CI =0.97-0.99) showed a strong correlation with the incidence and progression of myopia( P <0.05). Conclusion Myopia is growing rapidly in the central region of Jiangsu Province. It is suggested that diopter, axial length, naked eye vision, age, height and other indicators should be included in the refractive archives of children and adolescents in the region.

【Objective】 To analyze the metagenomics and microbiology of voluntary blood donors in China, so as to assess the potential threats of emerging infectious diseases to the safety of blood transfusion. 【Methods】 12 300 plasma samples (10 mL each) collected by central blood stations in Chongqing, Liuzhou, Urumqi, Mianyang, Wuhan, Nanjing, Mudanjiang, and Dehong Prefecture area from 2012 to 2018 were subjected to total DNA extraction after ultracentrifugation (32 000 rpm/min, centrifugal radius 91.9 mm) in minipools of 160 donations. The metagenomic library was constructed, and deep sequencing was conducted by Illumina Hiseq 4 500. By comparing with reference sequences of bacteria, fungi, parasites and viruses, metagenomic data were analyzed, classification of microbes were identified, and potentially harmful pathogens were evaluated. 【Results】 A total of 632 GB clean data were obtained by deep sequencing, and the top three pathogens were Pseudomonas(0.561 1%), Burkholderia(0.468 7%) and Serratia(4.242 0%). Pathogens with potential threat which could be transmitted by blood transfusion or blood products were found, such as human parvovirus B19(0.126 6%), Leishmania spp(1.348 5%) and Toxoplasma gondii(0.615 8%). 【Conclusion】 Our study analyzed metagenomics of voluntary blood donors in parts of China and revealed pathogens that may cause potential harm to blood safety, which were helpful for targeted prevention and control of emerging infectious diseases.

Objective:To analyze the current situation of cardiovascular diseases and the exposure as well as control level of their risk factors in the Chinese residents.Methods:Based on the 2017 China Cardiovascular Health Index (hereafter referred to as CHI) study, data on the 29 indicators from three dimensions named as prevalence of cardiovascular disease, exposure to relevant risk factors, and prevention and control of risk factors of the 31 provinces in China (excluding Hong Kong, Macao and Taiwan) were obtained. To make a higher CHI score indicate better cardiovascular health levels, all the reverse metrics were firstly converted into positive metrics. Thenstandard normal conversion were adopted and a percentage score was assigned to each value according to its area proportion under the standard normal conversion distribution curve. Finally the scores of the three dimensions and the total CHI were calculated by weighted sum of these scores. Scores and ranks in each dimension were used to compare the performance in different provinces.Results:Heilongjiang, Tibet, Jilin, Henan, Xinjiang had the lowest scores in the prevalence of cardiovascular disease. Tianjin, Hebei, Liaoning, Shanxi and Beijing had the lowest scores in the exposure to relevant risk factors. Hainan, Guizhou, Yunnan, Shaanxi and Guangxi had the lowest in the prevention and control of risk factors. In terms of behavioral risk factors, smoking rates, rate of insufficient physical activity, obesity rate of adults aged 18 in the 31 provinces in China excluding Hong Kong, Macao, Taiwan were 26.80% (25.15%, 29.25%), 17.80% (11.60%, 19.45%) and 12.00% (8.90%, 17.95%), respectively. The daily per capital salt intake level was 8.6 (8.2, 9.3) g. As for metabolic risk factors, the prevalence of dyslipidemia (33.7%) exceeded hypertension (26.0%) and diabetes (9.7%), while its awareness rate (14.5%), treatment rate (7.9%) and control rate (5.4%) were all below the corresponding levels of hypertension and diabetes.Conclusion:Risk factors of cardiovascular disease in China is relatively severe and the prevention and control of dyslipidemia needs to be further strengthened.

Objective:To analyze the current situation of cardiovascular diseases and the exposure as well as control level of their risk factors in the Chinese residents.Methods:Based on the 2017 China Cardiovascular Health Index (hereafter referred to as CHI) study, data on the 29 indicators from three dimensions named as prevalence of cardiovascular disease, exposure to relevant risk factors, and prevention and control of risk factors of the 31 provinces in China (excluding Hong Kong, Macao and Taiwan) were obtained. To make a higher CHI score indicate better cardiovascular health levels, all the reverse metrics were firstly converted into positive metrics. Thenstandard normal conversion were adopted and a percentage score was assigned to each value according to its area proportion under the standard normal conversion distribution curve. Finally the scores of the three dimensions and the total CHI were calculated by weighted sum of these scores. Scores and ranks in each dimension were used to compare the performance in different provinces.Results:Heilongjiang, Tibet, Jilin, Henan, Xinjiang had the lowest scores in the prevalence of cardiovascular disease. Tianjin, Hebei, Liaoning, Shanxi and Beijing had the lowest scores in the exposure to relevant risk factors. Hainan, Guizhou, Yunnan, Shaanxi and Guangxi had the lowest in the prevention and control of risk factors. In terms of behavioral risk factors, smoking rates, rate of insufficient physical activity, obesity rate of adults aged 18 in the 31 provinces in China excluding Hong Kong, Macao, Taiwan were 26.80% (25.15%, 29.25%), 17.80% (11.60%, 19.45%) and 12.00% (8.90%, 17.95%), respectively. The daily per capital salt intake level was 8.6 (8.2, 9.3) g. As for metabolic risk factors, the prevalence of dyslipidemia (33.7%) exceeded hypertension (26.0%) and diabetes (9.7%), while its awareness rate (14.5%), treatment rate (7.9%) and control rate (5.4%) were all below the corresponding levels of hypertension and diabetes.Conclusion:Risk factors of cardiovascular disease in China is relatively severe and the prevention and control of dyslipidemia needs to be further strengthened.

OBJECTIVEDust sample mass gain is too smaller to satisfy the limit of detection (LOD) even in most cases during dust sampling at workplaces nowdays, especially for respirable fraction. Therefore, it is aimed to solve the problem by increasing sample load with high flow rate samplers.

METHODSIn A and B two shipyards respirable welding fume was sampled by high flow rate cyclone samplers of FSP-10 (10 L/min) for 2-2.5 hours and normal flow rate FSP-2 (2 L/min) for 3-4 hours with a stratigy of parallele sampling at the same workpalce, in order to compare their mass gain, coincidence rate with LOD, and airborn dust concentration.

RESULTSSample mass gain of 0.97±0.40 mg and 1.61±0.86 mg respectively in the two factories by FSP-10 was significantly higher than that of 0.29±0.12 mg and 0.51±0.27 mg by FSP-2 (t-test, P<0.05 in both cases) , increasing herewith the coincidence rate with LOD from 26.8% (when sampling with FSP-2, calculated together with samples of the two factories) to 89.7%. However there was no significant difference in dust concentrations by the two different samplers, 0.53±1.88 vs 0.73±1.61 mg/m(3) by FSP-2 and FSP-10 in the shipyard A and 1.14±1.78 vs 1.01±1.63 mg/m(3) in the factory B (t-test, P>0.05 in every case) . In addtion, sample loading by FSP-2 was found to be correlated to sampling time (R(2)=0.7906, y=0.002 6x) , therefore, it has to sample for ≥192.3 min to meet the LOD (0.5 mg) in case of normal flow rate.

CONCLUSIONBy using of high flow rate cyclone FSP-10 the problem of LOD could be solved, along with increased sample mass and similar respirable dust concentration by the two samplers. Some techincal improvements of FSP-10 and increasing of LOD coincidence rate by other methods was also disscussed.

Air Pollutants, Occupational ; analysis ; Construction Industry ; Dust ; analysis ; Environmental Monitoring ; instrumentation ; Occupational Exposure ; Ships ; Workplace

Objective To investigate the correlation of serum uric acid (SUA) level with the prevalence of metabolic syndrome (MS). Methods A random, multi-stage cross-sectional study was performed in 2364 resuden, aged from 20 to 74, in Lanzhou, Gansu province.The resudents were divided into groups according to the level of SUA or 4 components of MS. The relationship between SUA and MS was analyzed. Results The overall morbidity of MS was 20.13 % in Lanzhou , and the morbidity of MS was higher in female than that in male (23.22% vs. 17.37%, P < 0.05);The prevalences of MS was higher in the hyperuricemia (HUA) people than that in the healthy people (32.40 % vs. 17.70 %,P < 0.05); With the increase of SUA level, the morbidity rates of MS and its components increased;The risk of MS showed a gradual increase with the SUA level, the risk of MS(odds ratio,95%CI)in sex-specific quartiles of SUA was 2.33(1.45 ~ 3.71),2.33(1.45 ~3.71),2.44(1.53 ~ 3.89)in male;and 1.58(0.97~2.56),2.54(1.60 ~ 4.00),5.29(3.41 ~ 8.22)in female. The more the components of MS , the higher the SUA level was found for both the male and the female subjects , with the higher rate of HUA morbidity(P < 0.05). Conclusion There is a significant association between SUA level and MS, as well as the MS components. Comprehensive prevention and control should be taken for the reduction of the risk factors, and much attention should be paid to monitor the SUA level.

Objective:Selected virulence factors more than and high virulent Aeromonas hydrophia strain made into inactivated vaccine,to study the immunization effect of inactivated vaccine.Methods:Crucian were vaccinated with formalin-killed vaccine via in-traperitoneal injection.Controls were injected with the same volumes of saline.Then the antibody titres, histopathology and relative percent survival were analyzed from samples of both groups.Results: The antibody in the indirect agglutination reaction could be detected in vaccinated fish once a weeks after immunization and reached highest level 6 weeks after immunization.The histopathology analysis indicated that the vaccine had a good protective effect on crucian target organs.Vaccinated fish showed 100%relative percent survival and the immune period would be 6 month.Conclusion:The vaccine in this study has a significant protective effect on crucian and may be used as effective fish vaccines against bacterial septicemia.

BACKGROUND:Poly(lactide-co-glycolide) (PLGA) scaffold is widely used in tissue engineering, but its poor cel adhesion ability and strong hydrophobicity limit its further development and application. OBJECTIVE: To study the biocompatibility of electrospun poly (lactide-co-glycolide)/polyethylene glycol (PLGA-PEG) nanofibrous scaffolds with mouse neural stem celsin vitro. METHODS:Neural stem cels were isolated from embryos of CD-1 mice at 15 embryonic days. Electrospinning was used to prepare PLGA and PLGA-PEG nanofibrous scaffolds. Scanning electron microscope was used for scanning observation of scaffolds. The 5th passage neural stem cels were seeded onto PLGA and PLGA-PEG scaffolds respectively, and culturedin vitro. RESULTS AND CONCLUSION: Interconnected porous network structure was observed in both two kinds of scaffolds under the scanning electron microscope. Fiber diameters and porosities of PLGA and PLGA-PEG scaffolds showed no significant differences (P > 0.05). Cel Counting Kit-8 detection showed neural stem cels grew wel on both two kinds of scaffolds and the absorbance value of two groups increased continuously with incubation time (1, 3, 5, 7, 9, 11 days). And there were statisticaly significant differences in the absorbance values between two groups at each time point (P < 0.05). Moreover, the cel adhesion rate was significantly higher in the PLGA-PEG group than in the PLGA group at 3, 6, 9 hours of culture (P < 0.05). Hoechst 33342 staining showed normal morphology and quality of the nuclei, and significantly more cels were observed in the PLGA-PEG group than the PLGA group (P < 0.05). Under the scanning electron microscope, compared with the PLGA scaffold, the PLGA-PEG scaffold was better for growth and matrix secretion of neural stem cels. In conclusion, PLGA-PEG nanofibrous scaffolds prepared by electrospinning are safe, non-toxic and suitable for neural stem cels growth with wel biocompatibility, appropriate aperture and porosity.

Objective To investigate the prevalence of chronic kidney disease (CKD) and its risk factors in Chinese elderly persons.Methods All of the people who underwent physical examination and treatment in the geriatric department of Beijing Hospital during January 2004 to January 2007 were included in the study.Age, body height, body mass index and blood pressure were recorded.Bloody urine was ascertained by phase-contrast microscope, and urine protein was measured by dipstick test.The hemoglobulin, serum eretinine, blood urea nitrogen, blood lipid and serum uric acid were measured by autobiochemical analyzer.HbsAg was checked by enzyme-linked immunosorbent assay (ELISA).Glomerular filtration rate (GFR) was estimated by Crockeroft-Gauh equation and abbreviated MDRD equation.Binary logistic regression analysis was used to test the risk factors for proteinuria and CKD.Results The prevalence of proteinuria was 4.9% in 1082 elderly persons.And 47.23% of the elderly suffered from decreased renal function.The morbidity of CKD was 48.43%.Binary logistic regression analysis showed that diabetes(OR= 2.257) and microscopic hematuria(OR=5.324) were the risk factors of proteinuria (both P<0.05).And the risk factors for CKD were hypertension(OR= 1.459), coronary arth'erosclerotic heart disease(OR=3.290), chronic obstructive lung diseases(OR=2.094), malignant tumor(OR=2.072), hyperuricemia(OR= 1.928),anemia(OR=8.122)and hematuria( OR= 1.604) (all P<0.05).Conclusions The morbidity of CKD in Chinese elderly persons was 48.43%.And the related risk factors were diabetes,hypertension, hyperuricemia, coronary artherosclerotic heart disease and chronic obstructive lung disease.