Objective To evaluate lactulose breath hydrogen test in diagnosis of small intestinal bacterial overgrowth in children.Me-thods Thirty-five children,aged 3 to 13 years old with mean (7.72?3.06) years old presented with chronic diarrhea,abdominal pain and flatulence.Among them,18 cases were male and 17 cases were female.Breath hydrogen test was carried out after the administration of a 0.5 g?kg-1 or 10 g lactulose,which was 100 g?L-1 solution.After the ingestion of lactulose,the breath hydrogen was collected in every 20 minutes and up to 3 hours.Small intestinal bacterial overgrowth was diagnosed as positive when the hydrogen concentration increased more than 20 mg?m-3 in a sample.Results Eighteen cases in 35 (51.43%) children were positive and 17 cases were negative.Among these positive cases,8 cases in 18 (22.86%) patients were typically double peaks in breath hydrogen concentrations.Among the causes of small intestinal bacterial overgrowth in children,4 cases with chronic superficial gastritis,4 cases with chronic bacterial enteritis,2 cases with malnutrition and anorexia,1 case with volvulus of stomach,1 case with massive resection of small intestine,1 case with steatorrhea and 5 cases with unknown causes.Four cases of chronic bacterial enteritis were gained remission by antimicrobial agents.The other cases were treated by lac-to-and bifidbacteria probiotics.Seven patients of the clinical systems were controlled,3 cases were improved remarkably and 4 cases were failed.Conclusions The lactulose breath hydrogen test is validated as screening test in the diagnosis of small intestinal bacterial overgrowth in children.Antimicrobial agents and bifidbacteria probiotics is effective in treatment of small intestinal bacterial overgrowth.

The brown slime inside pipeline of the polluted mineral waters well was analyzed. It was confirmed that the brown slime was a biofilm formed mainly by growth of bacteria contaminant, using microscope analysis. After treated with HCl, the brown crystals and mycelioid matter presented in slimes disappeared. It was verified these were metal deposits. The samples produced Prussia blue deposits by dropping K 4Fe(CN) 6 and HCl, which proved that the metal deposits were iron compound. Also it was believed the biofilm was produced by growth of iron bacteria, mixed with deposits of iron compound. The iron bacteria have been isolated from the slimes and cultured in the laboratory. The colony on agar plate also produced Prussia blue deposits after treated with K 4Fe(CN) 6 and HCl. The cells form of pure culture was the same as that in the samples by electronmicroscope analysis. Therefore, It indicated that the bacteria on biofilm inside pipeline were iron bacteria mainly.

In this assay, the reaction kinetics, optimum temperature, pH and various influential factors of ATP microbial rapid detection reagent by bioluminescence were studied. The results showed that it's enough for detection system to have 40 ~ 50?g/mL D-Luciferin. The light production decreased fastest in the first minute of reaction, then began to decay slowly. The optimal reaction temperature was 24℃~25℃and the optimal pH was pH 7.2 -7.4 in the reaction system. In addition, when stored at 4℃for 45h, the dissolved reagent solution could keep its 86% activity. When preserved at 25℃, the enzyme activity decreased less for 1h, and degraded gradually as time went by and only left 53. 5% of its activity after 6. 5h. While stored at 33℃, the enzyme activity decreased quickly with the time and only left 59. 1% after 1. 5h. The result indicated that storage temperature was a very important influential factor to the activity of reagent Meanwhile, different chemical substance such as acid, alkali, salt and surfactants inhibited the ATP bioluminescent reaction. When the concentration of NaCl reached 1. 5g/L, it could inhibit 52. 5% light production. Triton X-100, acid, and alkali also had some effects on the reaction, while CTAB, SDS and TCA would inhibit the bioluminescent reaction seriously.

Adult ; Female ; Health Knowledge, Attitudes, Practice ; Health Promotion ; Humans ; Lead ; Male ; Middle Aged ; Occupational Exposure ; prevention & control ; Occupational Health ; Occupational Health Services ; Stearates ; Young Adult

Animals ; Glutathione ; therapeutic use ; Guanidines ; therapeutic use ; Ischemic Postconditioning ; methods ; Male ; Myocardial Reperfusion Injury ; physiopathology ; prevention & control ; Random Allocation ; Rats ; Rats, Wistar ; Sodium-Hydrogen Exchangers ; antagonists & inhibitors ; Sulfones ; therapeutic use

Action Potentials ; Animals ; Bufo bufo ; Caffeine ; pharmacology ; Female ; Heart ; drug effects ; physiology ; In Vitro Techniques ; Male ; Sciatic Nerve ; physiology

The purity of 4,4′-dimethoxy-5,6,5′,6′-bis (methylenedioxy)-2′-morpholine methylenebiphenyl-2-methyl formate methanesulfonate (IMH), a new drug for fatty liver treatment, was determined through differential scanning calorimetry (DSC). Analysis of two-factor non repeatability method was performed in the investigation the effects of two factors (heating rate and sample weight) on purity determination. The DSC experimental parameters were optimized as follows: heating rate was 10 ℃·min^-1, temperature range was 150-300 ℃, sample weight was 2.0-4.1 mg, and N₂ flow rate was 80 mL·min^-1. The linear correlation coefficient (r) of this DSC method was 0.999 8. The RSD value (n = 6) of precision was 0.03%. The standard value and uncertainty of the purity results of the multiple batches of IMH drugs were (99.74 ± 0.29)%, (99.91 ± 0.28)%, (99.90 ± 0.28)%, and (99.81 ± 0.28)% with inclusion factor (K) of 2 and confidence probability (P) of 0.95. The results were basically consistent with the results of the mass balance method. The DSC mehod is a simple, rapid and accurate method, and provides a new reference method for determining the purity of IMH drugs, improves the accuracy and reliability of purity determination.

Objective To evaluate endovascular therapy and open surgery for subclavian artery occlusion disease. Methods In this study, 69 patients received endovascular therapy (44 patients)or open surgery(25 patients)from January 2002 to July 2007.Balloon dilatation was carried out in 3 cases and 43 stents was placed in 41 cases. Results All procedures were successful. In endovascular therapy group, the ratio of healthy/dieased side of mean blood pressure was improved from 0.66±0.14 to 0.96±0.13(t=9.532,P＜0.001＝;in surgery group, the ratio improved from 0.63±0.16 to 0.95±0.18(t=8.236,P＜0.001＝.Sixty-one discharged patients were followed up for 2～49 months(mean 16.7 months),in endovascular group, restenosis occurred in 1 patient 1 year after the therapy, in surgery group, all prothesis remained patent and there was no complication related to prothesis. Conclusions Both endovascular therapy and surgery were the effective methods for subclavian artery occlusion, and endovascular therapy is preferred for less invasiveness.

Objective To study the application of multi-slice spiral CT(MSCT) portography in diagnonsis of pancreatic portal hypertension. Methods Forty-seven patients with lesion in body or tail of pancrease,47 normal subjects and 126 patients with portal hypertension underwent MSCT portography with LightSpeed 16 CT scanner. The inner diameter of portal system and the main collateral veins were measured in maximun intensity projection (MIP) image. The volume of liver and spleen were also measured in volume rendering (VR) image. The liver parenchyma and main portal vein enhancement in portal vein phase were also taken. The endoscopy examination was made in 57 patiens with portal hypertension. Results In 47 patiens with lesion in body or tail of pancreas , stenosis or occlusion of spleen vein were found in 38 patients(pancreatic portal hypertension in 27 patients, chronic and acute pancreatitis in 11 patients). In 38 patients with pancreatic portal hypertension, esophageal varices was found in 5 patients(13.2%), gastric fundus varix in 25 patients (65.8%), gastric body variees in 22 patients (57.9%), short-gastric vein/post-gastric vein(SGV/PGV) in 26 patients (68.4%), coronal gastric vein in 26 patients (68.4%),dilated gasto-omenta vein in 24 patients(63.2%), mesenterica varicesin 1 patient, splenic vein occlusion in 14 patients (36.8%), splenic vein stenosis in 23 patinets(63.2%). Conclusions The patients with pancreatic portal hypertension were demonstrate characteristic changes in MSCT portography. The MSCT portography is helpful in etiological diagnosis of pancreatic portal hypertension by supplying images in vessel morphology.

Abstract: Objective　To investigate the relationship between the body mass index (BMI) levels and the negative conversion time of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) nucleic acid in adult coronavirus disease 2019 (COVID-19) patients and the asymptomatic persons. Methods　Asymptomatic infected patients and confirmed COVID-19 patients admitted to Chengdu Public Health Clinic Center from February 2021 to November 2021 were dynamically included. The epidemiological and clinical characteristics of the objects were collected, and the SARS-CoV-2 nucleic acid testing of the objects during their hospitalization was continuously monitored, and the negative nucleic acid conversion time was recorded. The t test or Wilcoxon rank sum test, χ2 test or Fisher's exact probability method examine were used to distribute characteristics of each group of variables and the connection between different variables, respectively. Then the variables showed differences in distribution (P<0.05) between different BMI groups were included in the multivariate Cox proportional risk regression model. Results　A total of 253 subjects ranged from 18 to 63 years old, with M(P25, P75) age of 37.0 (30.0, 47.0) years old, were included in this study. The male to female ratio was 4.16 to 1. The BMI was (23.97±3.33) kg/m2. 50.59% (128/253) of the objects were overweight or obese, and 78.13% (100/128) were overweight. The negative time of SARS-CoV-2 nucleic acid conversion of all subjects ranged from 1 to 71 days, with M(P25, P75) of 7.0 (2.0, 18.0) days (P<0.001). The negative time of SARS-CoV-2 nucleic acid conversion of the normal weight or the thin, and the overweight or obese were 5.00 (2.00, 19.00) and 8.00 (2.00, 17.75) days respectively. The results of multivariate Cox's proportional hazards regression model showed that the BMI levels may not be associated with the negative conversion time of SARS-CoV-2 nucleic acid (HR=1.090, 95%CI: 0.843-1.410, P=0.510). Conclusions　Adult asymptomatic persons and confirmed COVID-19 patients are mainly middle-aged and young males, and overweight or obesity is relatively common. Overweight or obesity cannot be considered as an independent factor influencing the negative conversion time of SARS-CoV-2 nucleic acid.