Beijing ; China ; Humans ; Occupational Diseases ; diagnosis

The influencing factors of ultrasonic extraction(UE) and ultrasonic-soxhlet extraction(USE) were analyzed based on orthogonal experimental design. The optimum analytical conditions of two methods were determined. The three different methods: UE, USE and traditional soxhlet extraction(SE) were compared by simultaneous analysis with three different soil samples: fresh contaminated soil, soil after microbial remediation and soil after phytoremediation. The optimum condition of the UE was extracting 4 times with chloroform, 15 mL extractant every time. The optimum condition of the USE method was ultrasonic for 10 min at 60 W, followed by soxhlet extraction with 125 mL extractant for 6 h. Compared the three different methods, USE method showed the best result with the highest average extraction rate of 102.98%, the UE method with average extraction rate of 99.69%, and the SE method with low average extraction rate of 97.31%. The research indicates that USE method is effective in determining soil total petroleum hydrocarbons(TPH) within shorter time and higher efficiency and can be used as a method for determining TPH content in different soils.

Objective To study the deficiency of serf-regulation in impulsivity children with attention deficit hyperactivity disorder(ADHD)based on both procedures of action and inhibitory control.The event related potentials(ERPs)component P3 in Go/NoGo tasks was analyzed.Methods There were 15 impulsive children with ADHD and15 normal children in control group.Their age was from seven years old to eleven years old.The Go/NoGo stimulate-response model was adopted in the ERPs test.The occurrence of Go and NoGo trials was equal probability(each of 50%).Results(1)The high impulsive children had slower Go-RTs(reaction times)in making correct response than normal children,tended to be faster of NoGo-RTs in making error response and had lower correct rate.(2)P3amplitudes in both control and ADHD children had the tendency of Go-P3 > NoGo-P3,especially significant at CPz and Pz in ADHD children,showed the trend of parietal central to parietal maximum and the frontal minimum,The NoGo-P3 amplitude of ADHD group was smaller especially significant at FCz and Cz,and tended to be smaller than control on left hemisphere.(3)NoGo-P3 is smaller in impulsive children with ADHD than normal children,most significant at FCz.(4)Brain maps showed that impulsive children with ADHD were lower activation significantly in the right frontal area.Conclusions The efficiency of ADHD in action is lower.The behavior regulation in impulsive children is limited.Go/NoGo-P3 reflects action processing and attention.The left parietal lobe to central area is engaged much more in action procedure and attention.This research shows the evidence of weakened parietal cortex and right frontal cortex in impulsive children with ADHD.

Objective: To investigate the prevalence and risk factors of occupational musculoskeletal disorders among workers in heavy-duty automobile parts factories in Beijing Municipality, so as to provide insights into development of effective interventions for occupational musculoskeletal disorders. Methods: The workers in three heavy-duty automobile truck parts factories in Beijing Municipality were recruited using the convenient sampling method during the period from May 2019 to October 2020. Subjects' demographic characteristics, type of job and prevalence of occupational musculoskeletal disorders at various sites were collected using self-designed electronic questionnaires, and the factors affecting the development of occupational musculoskeletal disorders were identified using a multivariable logistic regression model. Results: A total of 264 workers were enrolled, including 260 males (98.48%) and 4 females (1.52%). The participants had a mean age of (31.71±6.13) years, and mean duration of (7.51±5.25) years at current position, and mechanical technician was the major type of work (129 workers, 48.86%). The prevalence of occupational musculoskeletal disorders was 70.08% among the participants, and high prevalence of occupational musculoskeletal disorders was found in the lower back/waist (41.28%), shoulder (40.15%), neck (39.02%) and upper back (33.33%). Multivariable logistic regression analysis identified females (OR=1.280, 95%CI: 1.021-1.602) and head-down posture at work (OR=2.644, 95%CI: 1.034-6.763) as risk factors for occupational musculoskeletal disorders at neck; females (OR=1.633, 95%CI: 1.624-2.117), sheet metal workers, mechanical technicians and painters (OR: 5.811-10.452, 95%CI: 1.205-54.027), working in an uncomfortable posture (OR：1.376-7.749, 95%CI: 1.034-27.270) and frequent working overtime (OR=2.081, 95%CI: 1.192-4.137) as risk factors for occupational musculoskeletal disorders at shoulder; and sheet metal workers, mechanical technicians and painters (OR: 8.760-11.948, 95%CI: 1.630-66.927), working in an uncomfortable posture (OR：4.067-12.185, 95%CI: 1.332-47.523) and frequent working overtime (OR=2.201, 95%CI: 1.142-4.244) as risk factors for occupational musculoskeletal disorders at waist/back. Conclusions The prevalence of occupational musculoskeletal disorders is high among workers in heavy-duty automobile parts factories, which mainly occur at shoulder, neck, waist and back. Type of work, working posture and working duration are main factors affecting the development of occupational musculoskeletal disorders.

Objective To detect the genomic copy number variations(CNVs) of mice embryonic neural tissue with neural tube defects (NTDs) induced by methotrexate (MTX),and investigate the molecular genetic mechanisms between folic acid metabolism disorders and NTDs pathogenesis.Methods C57BL/6J NTD mice model was induced by MTX on gestational day 7.5,and the maternal serum and NTD embryonic neural tissues were collected;the array-comparative genomic hybridization(array-CGH) assay was utilized to analyze the whole genomic CNVs in NTD embryonic neural tissues;reverse transcription polymerase chain reaction(RT-PCR) was used to confirm the positive results;the maternal serum concentrations of folic acid and related metabolites and dihydrofolate reductase (DHFR) activity were detected by liquid chromatography-tandem mass spectrometry and enzymatic methods,respectively.Results ArrayCGH and RT-PCR results showed the 3 high confidence CNVs on XqE3,XqA1.1-qA2 and XqA1.1 in the NTD embryonic neural tissues.The NTD maternal serum concentrations of 5-methyltetrahydrofolate,5-formyltetrahydrofolic acid,S-adenosyl methionine and DHFR activity were reduced significantly compared with the control group,and there were statistical differences(all P ＜0.05).Conclusions There are obvious CNVs in embryonic neural tissue of NTD mice induced by MTX and folic acid dysmetabolism might cause mice embryonic neural tube developmental disorders through CNVs.

Objective To investigate the relationship between nodular goiter and thyroid cancer and the causes of postoperative recurrence in patients with nodular goiter(NG) undergoing operative treatment. Methods The clinical date of 199 cases of NG were retrospectively analysed. Results Pathological examination revealed that 7 cases were accompanied by thyroid cancer including 2 micro-cancer, all the 7 cases were papillary carcinomas. The postoperative recurrent rate of NG was 11.5%(18 cases).Thyroid nodule reccurrence rate in patients received - operative thyroxin replacement therapy was significantly lower than that in patients not received thyroxin therapy( P

Objective To investigate the clinical pathological features and imaging findings of primary pulmonary sarcomatoid carcinoma. Methods Fifteen patients with a pathologically verified primary pulmonary sarcomatoid carcinoma were reviewed retrospectively. Fourteen patients had CT examinations and I0 of them had contrast-enhanced CT scan. Nine patients had chest plain films. Results Of 15 patients, 14 were peripheral and 1 was central, diameters ranging from 2.5 cm to 9.5 cm. Five located in the upper, 3 in the middle and 4 in the lower lobe of the right lung. The other 3 located in the upper left lobe. All cases presented with a spheroid solid lung mass on chest plain film and CT examinations. Three had irregular eccentric cavities. Six were well demarcated, 2 were ill defined, 4 were lobulated and 3 were speculated. The central case had obstructive pneumonia and showed ill defined. Ten showed irregular peripheral heterogeneous contrast enhancement. The center part of the tumor showed no enhancement or inhomogeneous enhancement. Seven had thoracic wall or pleural invasion, 4 had hilar or mediastinal lymphopathy and 2 had metastasis. Histopathologically, 8 were pleomorphic carcinoma, 2 were spindle cell carcinoma, 3 were giant cell carcinoma and 3 were pulmonary blastomas. Conclusion The X-ray and CT findings of the primary pulmonary sarcomatoid carcinoma are not specific. The clinicopathologic features were the evidence of diagnosis.

Adolescent ; Adult ; Aged ; Aged, 80 and over ; Agricultural Workers' Diseases ; epidemiology ; Child ; Child, Preschool ; China ; epidemiology ; Disease Notification ; Humans ; Infant ; Middle Aged ; Pesticides ; poisoning ; Young Adult

Beijing ; epidemiology ; Humans ; Occupational Diseases ; diagnosis ; epidemiology

Objective To investigate TCM resources in Changshou District of Chongqing based on the fourth national census of TCM resources; To provide theoretical references for the protection and exploitation of TCM resources. Methods Sample-plot survey, line survey and interview survey were used in this study. Results Totally 142 families, 482 genera and 639 species (including subspecies and varieties) were collected from the general survey of TCM resources in this region. There were a total of 575 species of medicinal plants, including 456 kinds of ordinary medicinal plants and 119 species of national key medicinal plant which were recorded in the Chinese Pharmacopoeia (2015 Edition). But there was no department leader of the Chinese medicine industry and TCM cultivation was almost blank. Nowadays there was no TCM processing enterprise, and the quality could not be controlled. The continual increase of production cost restricted the development of TCM industry. Conclusion TCM resources in Changshou District of Chongqing are abundant, while the TCM industry is almost blank. The support and guidance from government are needed to develop TCM industry in this area.