Separation and determination of triadimefon and its metabolites triadimenol enantiomers in fruit puree by supercritical fluid chromatography.

A method was established for the separation and determination of triadimefon and its metabolite triadimenol enantiomer residues in major complementary fruit puree for infants and young children (banana puree, pineapple puree, and grape puree) by supercritical fluid chromatography. After the samples were extracted with acetonitrile and purified with a solid phase extraction cartridge, Acquity Trefoil CEL2 chiral chromatographic column was adopted for separation, and gradient elution was conducted at the flow rate of 1.0 ml/min under the mobile phase of supercritical carbon dioxide - 0.

[Comparative study with the effect of stromal cell derived factor-1 on osteogenic differentiation of human healthy and inflammatory periodontal ligament stem cells].

Objective: This study aims to compare the osteogenic differentiation capability of stem cells derived from human inflammatory periodontal ligament tissues (iPDLSCs) with those of stem cells derived from healthy periodontal ligament tissues (hPDLSCs). Both types of tissues were induced by stromal cell derived factor (SDF-1) in vitro.

Methods: iPDLSCs and hPDLSCs were primarily cultured by tissue digestion method and purified by limited dilution cloning.

Three new diterpenoid alkaloids from the roots of Aconitum duclouxii.

Three new C₁₉-diterpenoid alkaloids, ducloudines C (1), D (2), and E (3), were isolated from the roots of Aconitum duclouxii. Their structures were established on the basis of extensive spectroscopic analyses. Ducloudine C (1) is the first aconitine-type C₁₉-diterpenoid alkaloid with a C=O group at C-3 and a C=C bond between C-1 and C-2.

[A prospective cohort study on comparison of risk of death of respiratory system diseases between occupational dust exposure and smoking].

Objective: To compare the effects of dust exposure and smoking on mortality of respiratory system diseases (RSD).

Methods: Based on the Guangzhou Occupational Health Surveillance Record System established between 1989 and 1992, 80,987 factory workers, aged 30 years old or older, occupationally exposed or not exposed to dusts, were included in a prospective cohort study.

Results: (1) The mean age of the cohort was 43.

[A prospective cohort study on the comparison of risk of occupational dust exposure and smoking to death].

Objective: To compare the effects of dust exposure and smoking on mortality.

Methods: Based on the Guangzhou Occupational Health Surveillance Record System established in 1989-1992, 80 987 factory workers, aged > or = 30, occupationally exposed to dust and non-exposure to dust, were included in a prospective cohort study.

Results: (1) The mean age of the cohort was 43.

[A cohort study on the relationship between blood pressure levels and the mortality of cerebro-cardiovascular diseases in Guangzhou workers].

Objective: To study the relative risk (RR) of mortalities of cerebro-cardiovascular diseases (CVD) in Guangzhou workers with hypertension.

Method: Prospective cohort study was conducted in 78,379 workers, aged >or= 35, from 399 factories. Cox regression model were mainly used for data analysis.

Smoking, occupational exposure and mortality in workers in Guangzhou, China.

Purpose: To compare the mortality risk of smoking and overall occupational exposure in Guangzhou, China.

Methods: Baseline data on smoking and occupational exposure of 82159 workers aged 30+ were retrieved from medical records established in 1988-92. Vital status and causes of death were followed through 1998.