Objective To explore the conversion rate of iodate ions (IO3-) being reduced to iodide ions (I-) by ascorbic acid (C6HsO6,VC) in simulated human gastric juice,and to provide references for further safety evaluation of edible salt iodized with potassium iodate.Methods An ion chromatography method was developed to detect iodide ions in simulated gastric juice.The conversion rate of iodate ions being reduced to iodide ions was used as the index for scavenging rate of iodate ions.In simulated gastric juice in vitro and in 37 C water bath,the scavenging effects of VC on iodate ions were determined in simulated gastric juice with different VC concentrations and simulated gastric juice acidities,as well as for different reaction time.Ion chromatography column:Dionex IonPac AS19 (250 mm × 4.0 mm);eluent:KOH 30 mmol/L (online produced),isocratic eluting,flow rate 1.0 ml/min,injection volume 100 μl,and detected by a conductivity detector.Results Performance of the method:within the range of 0-5 000 μg/L,iodide ions concentration and the chromatographic peak area had a good linearity (correlation coefficient r =0.999 7),and the detection limit of iodide ions was 20 μg/L.For quantification of iodide ions in simulated gastric juice,the relative standard deviation (RSD) of repeated measure for 6 times was ＜ 2.0％,the standard addition recovery rate was 97.6％-102.4％,and the overall average recovery rate was 99.4％.In the simulated gastric juice with a pH of 1.4 containing 5 mg/L and ≥ 10 mg/L VC,the reaction time to achieve 100％ conversion rate of iodate ions being reduced to iodide ions was 5 min and 2 min,respectively.In the simulated gastric juice with a pH of 3 containing 10 mg/L ascorbic acid,the reaction time to achieve 100％ conversion rate was 15 min.VC quantitatively reduced iodate ions to iodide ions by the stoichiometric relationship between reactants of the reduction reaction equation,and every 100 μg VC quantitatively reduced 24.0μg of iodine in iodate to iodide ions.Conclusions In simulated gastric juice,the reaction of iodate ions being reduced to iodide ions by VC is a stoichiometric reaction with relatively fast reaction rate,the scavenging rate of iodate ions by VC within the concentration level in human gastric juice can reach 100％.The results prompt that the iodate ions from edible salt iodized with potassium iodate in daily diet are reduced to iodide ions mainly in the human stomach.

Brain-derived neurotropic factor (BDNF) contents in blood and cerebrospinal fluid (CSF) were detected by ELISA method in 30 cases of hypertensive cerebral hemorrhage (HCH group) and 30 healthy subjects (control group).The performance and neurological functions of patients were evaluated by National Institutes of Health Stroke Scale( NIHSS),Hamilton Depression Scale ( HAMD),Barthel Index of Daily Living Skills.The result showed that the contents of BDNF in blood and CSF of HCH patients in recovery stage were significantly higher than those in acute stage and those of control group ( P ＜ 0.05 ) ; the contents of BDNF in blood and CSF were negatively correlated with neurological impairment degree ( P ＜0.05).The results suggest that BDNF in the blood or the CSF may promote the recovery of neurological function in patients with hypertensive cerebral hemorrhage.

Objective To evaluate the effect of hyperbaric oxygen (HBO) therapy on pathological and ul-trastructure changes in cortical neurons after model focal cerebral isehemia. Methods Middle cerebral artery occlu-sion (MCAO) using the Zea-Longa method was administered to 48 Sprague-Dawley rats, who were subjected to cere-bral ischemia for 2 hours followed by reperfusion. They were then randomly divided into a treatment group and a con-trol group. HBO was applied to the rats in the treatment group, and any changes in the pathology and uhrastructure of neurons in the cortex were observed at preset time points. Results The infarct volume was significantly smaller inthe treatment group than in the control group, and pathological changes in brain tissue were also milder. Conclu-sions HBO could help protect cortical neurons in acute cerebral ischemia.

Objective To explore the rationality of correcting urinary iodine (UI) concentration by using urine specific gravity (U-SG).Methods Weighing method and refractometer method were used respectively to measure specific gravity of 10-30 g/L mass concentration of different inorganic salts (sodium chloride,sodium sulfate,ammonium biphosphate) and organic matters(urea,glucose,glycine) aqueous solution,and urine plus 10-30 g/L sodium chloride or urea.UI concentrations in urine samples of 27 pregnant women respectively were expressed by direct method,weighing method U-SG correction and refractometer method U-SG correction.One random urine sample was collected for six batches in different seasons from children aged 8-10 and pregnant women for determination of U-SG and UI concentration.UI concentration was determined by arsenic cerium catalytic spectrophotometry (WS/T 107-2006).Results ①Measured by weighing method,specific gravity of inorganic salt (sodium chloride,sodium sulfate,ammonium biphosphate) aqueous solution was significantly greater than that of organic matters (urea,glucose,glycine) aqueous solution which had the same mass concentration.The specific gravity of 10 g/L sodium chloride aqueous solution was 1.008,and that of 30 g/L urea solution was 1.006.②Measured by weighing method,10 g/L sodium chloride was added to 3 urine samples separately.Accordingly the increases of USG were 0.006,0.008 and 0.007,respectively.Otherwise,the increases of U-SG were 0.003,0.002 and 0.004,respectively,when adding 10 g/L urea.~he median results of UI concentrations in urine samples from 27 pregnant women were 106.4,165.2 and 211.8 μg/L,respectively,expressing obtained by direct method,weighing method USG correction and refractometer method U-SG correction.④The determination results of six batches urine collected from children aged 8-10 in different seasons,the median results of U-SG measured by refractometer method were 1.019 0-1.021 2,the median UI concentration results obtained by direct method and refractometer method U-SG correction were 134.5-181.7 μg/L and 157.7-190.4 μg/L.The determination results of six batches urine samples of pregnant women in different seasons,the median results of U-SG measured by refractometer method were 1.013 4 -1.017 1,the median UI concentration results obtained by direct method and refractometer method U-SG correction were 96.2-138.9 μg/L and 135.2-181.6 μg/L.Conclusions The change of sodium chloride concentration in urine is the most important reason for the change of U-SG.In China,the main source of UI is the intake of edible iodized salt.Iodized salt intakes directly affect the U-SG and UI concentration.If the U-SG is used to correct the UI concentration,there will be a phenomena that the lower intake of iodized salt the lower U-SG.So the UI concentration was falsely increased significantly after correction.Conversely higher intakes of iodized salt caused higher U-SG.The UI concentration was falsely reduced significantly after correction.Therefore,U-SG cannot be used to correct the UI concentration.

Objective To establish a method for determination of iodine in urine with no need for base urine match by inductively coupled plasma mass spectrometry (ICP-MS).Methods The diluent which contains 2.5 g/L N2H4·2HCl-1.0 g/L NH4C1-0.50％HC1-2.0％C2H5OH were used to eliminate the matrix interference in determination of iodine in urine by ICP-MS.The standard solutions and the urine samples were all diluted in a ratio of 19:1 (diluents:sample) before testing.The methodological evaluation of this new method was done through standard curve linearity,sample detection limit,precision and accuracy in determining urinary iodine.And the determine results were compared with the current urinary iodine arsenic cerium catalytic spectrophotometry standard method (WS/T 107.1-2016,hereinafter referred to as the standard method).Results The linear range of the calibration curve was 0-1 000 μ.g/L and the linear correlative coefficient was 0.999 9.The detection limit for urinary iodine was 0.4 μg/L (0.25 ml of urine was tested).Precision:The average coefficient of variation (CV)was 0.8％ with a range of 0.2％-1.7％ (n =6) when measuring 33 urine samples with iodine concentration of 26.5-854.4 μμg/L.Accuracy:The iodine standard of 40-400 μg/L was added for recovery test.The average recovery was 99.6％ with a range of 94.3％-103.4％ when measuring 24 urine samples with iodine concentration of 26.5-858.3 μg/L.The test results of 8 urinary iodine national standard materials with iodine concentration ranged from 64.5 to 883.0 μg/L were all within the given value range and the relative deviations were all below 3.0％ (n =12).No significant difference was found between the results of the 51 urine samples determined by the standard method (WS/T 107.1-2016) and the new method (t =0.836,P ＞ 0.05).Conclusions The new method to determine iodine in urine with no need for base urine match is successful established.This method has wide linear range,high sensitivity,good precision,accuracy and anti-interference ability,and is easy to be used and quickly to be analyzed of the test results,and is suitable for widely application in determining urinary iodine.

Background: Aberrant Bcl-2 transcription is closely related with nodal diffuse large B-cell lymphoma (DLBCL), however, the relationship between Bcl-2 and primary gastrointestinal DLBCL (PGI-DLBCL) was not fully studied.Aims: To investigate the relationship between Bcl-2 gene amplification and protein expression and clinicopathological characteristics, immunophenotype and prognosis of PGI-DLBCL.Methods: Clinical data was collected from 136 PGI-DLBCL patients receiving surgical treatment, and a telephone interview was conducted for survival information.Bcl-2 gene amplification and protein expression in tumor tissue were determined by fluorescence in situ hybridization and immuno-histochemistry, respectively, and relationships between Bcl-2 and clinicopathological characteristics, immunophenotype and prognosis of PGI-DLBCL were analyzed.Results: Among 136 PGI-DLBCL patients, 33 (24.3%) showing gene amplification and 90 (66.2%) showing protein expression of Bcl-2;gene amplification was correlated with primary tumor location, Ann Arbor stage, serum lactate dehydrogenase level, B symptom and International Prognostic Index (IPI) score (P<0.05), while protein expression was correlated with primary tumor location and immunophenotype (P<0.05).5-year overall survival (OS) in patients positive for Bcl-2 gene amplification and patients with non-GCB immunophenotype and positive for Bcl-2 protein expression were inferior to those negative ones (41.5%vs.71.5%, P<0.05;54.6% vs.84.6%, P<0.05).In Bcl-2 gene amplification or protein expression positive patients, 5-year OS of CHOP chemotherapy was inferior to that of rituximab combined with CHOP chemotherapy (48.6%vs.80.3%, P<0.05;66.4%vs.83.4%, P<0.05).Conclusions: Detection of Bcl-2 gene amplification is useful for prediction of prognosis in PGI-DLBCL.Both patients with Bcl-2 gene amplification and non-GCB patients with Bcl-2 protein expression have a poorer prognosis.Rituximab may improve the prognosis in patients with Bcl-2 gene amplification or protein expression.

Objective To analyze the epidemiological characteristics of measles, predict the incidence trend of the disease, and provide reference for the development of measles prevention and elimination strategies. Methods Descriptive analysis, seasonal index method, clustering analysis and ARIMA model were used for data analysis and trend prediction. Results The average annual incidence of measles in 2005-2018 was 3.01/100,000. It was at a low level after 2009, and rebounded in 2018. The seasonal index of March-June was greater than 1, which was the month of high incidence. The incidence of men was higher than that of women. The 0-3 years old and 10-30 years old groups had a high incidence, and the population was mainly scattered children, students, and nursery children. The areas with high incidence were mainly northwestern and southeastern Hubei. ARIMA (0,1,0) (0,1,1) was the optimal model. The prediction analysis showed that the incidence rate in 2019 will be 1.26/100 000. Conclusion After the implementation of booster immunization, the measles epidemic in Hubei Province was at a low level, but it fluctuated greatly in recent years and is currently showing a rising trend. The incidence was high in spring. Cases were ^"biphasic shift^" in groups 0-3 years old and 10-30 years old. Occupational distribution was consistent with the characteristics of high incidence in the age group. The mountain areas with poor sanitary conditions and economic backwardness, and regions with large population bases and high floating populations had a high incidence. The ARIMA model had good applicability in predicting the trend of measles incidence, which shows measles will continue to rise in 2019.

Objective To explore the spatial-temporal characteristics of influenza epidemic in Hubei from 2009 to 2020, and make short-term prediction to provide reference for influenza prevention and control strategies. Methods Time series seasonal decomposition model and geographic spatial analysis method were used to analyze spatial-temporal evolution characteristics of influenza prevalence in Hubei during 2009-2020. LSTM neural network model was used to predict the monthly influenza incidence from 2020 to 2023. Results Influenza was mainly prevalent in the end of winter and the beginning of spring (December to March) were periods of high influenza incidence. In recent years, the influenza pandemic has shown an increasing trend. Influenza epidemic was characterized by significant spatial differentiation, with ^“A-shaped point-axis structure^” surrounding counties were more severe . The epidemic center of gravity experienced a spatial evolution process from west to east and from north to south. LSTM neural network model predicted that although the influenza incidence rate from January 2020 to December 2023 is lower than that in 2019, it is still at a high level, and shows a peak epidemic in winter and spring. Conclusion Influenza epidemic in Hubei is characterized by a high epidemic period in late winter and early spring, and the southeast of Hubei is the key epidemic area. It is suggested that publicity and prevention and control should be strengthened according to people, time and place, and key populations and areas should be encouraged to receive influenza vaccines in advance.

Objective To analyze genetic testing and prenatal diagnosis of two pedigrees with X-linked ichthyosis.Methods Karyotyping,bacterial artificial chromosomes-on-BeadsTM (BoBs),fluorescence in situ hybridization (FISH) and single nucleotide polymorphism array (SNP-array) were used to detect amniotic fluid and peripheral blood specimens of two pedigrees,one with and one without known family history of ichthyosis.Clinical data was collected and analyzed as well.Results (1) The pedigree without known family history:Prenatal BoBs showed that the XC1 probe of fetus Ⅳ-12 was from 0.36 to 0.50,suggesting the presence of microdeletion.SNP-array analysis of gravida Ⅲ-13 showed a 1.68 Mb copy number deletion at Xp22.31 and four missing Online Mendelian Inheritance in Man (OMIM) genes (HDHD1,STS,VCX and PNPLA4).Fetal SNP-array revealed a deletion of arr[hg19] Xp22.31 (6 455 151-8 135 644)× 0,indicating a maternally inherited one.FISH analysis verified the deletion in STS gene in fetus Ⅳ-12,whose karyotype was 46,XY.The gravida's female cousin (Ⅲ-21) and nephew (Ⅳ-14) also had STS gene deletion,which size was the same as that from the gravida and the fetus.Fetus (Ⅳ-12) was delivered at term by cesarean section with normal skin,but an extensive white scales appeared on the abdomen one week after birth and the symptom was aggravated when the weather was dry.The infant was followed up to eight months old and no other clinical symptoms were found.(2) The pedigree with known family history:SNP-array revealed that a 1.2 Mb copy number deletion at Xp22.31 and four missing OMIM genes (HDHD1,STS,VCX and PNPLA4) were detected in pregnant women (Ⅲ-21),proband (Ⅳ-16) and fetus (Ⅳ-17).FISH analysis of the fetus verified the deletion in STS gene.The karyotype of the fetus was 46,XY.Fetus Ⅳ-17 was delivered at term by cesarean section with normal skin,but white scales widely appeared on the abdomen ten days after birth.The infant was followed up to four months old and no other clinical symptoms were found.Conclusion Molecular genetic techniques such as BoBs,FISH and SNP array are used in combination in this study to provide genetic testing and prenatal diagnosis to two XLI pedigrees,which is helpful for clinical diagnosis and genetic counseling.

Objective Summarize the characteristics of infectious disease reporting management, reflect on the exposed problems, and make reference suggestions under the situation of COVID-19. Methods In-depth analysis through literature research and practical demonstration. Results The functions of each department, organic integration, unified management, communication from top to bottom, upgrade and perfection, and information sharing can give full play to the early warning role of infectious disease surveillance. Conclusion The infectious disease reporting management system should be perfected and upgraded from top to bottom and from the inside out.