The research of liver failure in Banna miniature pigs caused by amanita exitialis / 中华劳动卫生职业病杂志

Objective: To explore the characteristics of Banna miniature pig liver failure induced by amanita exitialis. Methods: From September to October 2020, a reverse high performance liquid chromatography (RP-HPLC) method was used to determine the toxin content of amanita exitialis solution, and 2.0 mg/kg amanita exitialis solution (α-amanitins+β-amanitins) was administered orally to Banna miniature pigs. Toxic symptoms, blood biochemical indexes and histopathological changes of liver, heart and kidney were observed at each time point. Results: All Banna miniature pigs died within 76 h of exposure, and different degrees of digestive tract symptoms such as nausea, vomiting and diarrhea appeared between 6 and 36 h. The biochemical indexes of alanine aminotransferase, aspartate aminotransferase, total bilirubin, lactate dehydrogenase, myoglobin, creatine kinase isoenzyme, blood urea nitrogen and creatinine increased significantly at 52 h after exposure, and the differences were statistically significant compared with 0 h (P<0.05). The bleeding of liver and heart was obvious under macroscopic and microscopic observation, hepatocyte necrosis, renal tubule epithelial cell swelling. Conclusion: Large dose of amanita exitialis can cause acute liver failure of Banna miniature pigs, which is in line with the pathophysiological characteristics of acute liver failure, and lays a foundation for further research on the toxic mechanism and detoxification drugs of amanita exitialis induced liver failure.

Effects of Cytokines on Early Death in Patients with Newly Diagnosed Acute Promyelocytic Leukemia / 中国实验血液学杂志

OBJECTIVE@#To explore the effect of cytokine levels on early death and coagulation function of patients with newly diagnosed acute promyelocytic leukemia (APL).@*METHODS@#Routine examination was performed on 69 newly diagnosed APL patients at admission. Meanwhile, 4 ml fasting venous blood was extracted from the patients. And then the supernatant was taken after centrifugation. The concentrations of cytokines, lactate dehydrogenase (LDH) and ferritin were detected by using the corresponding kits.@*RESULTS@#It was confirmed that cerebral hemorrhage was a major cause of early death in APL patients. Elevated LDH, decreased platelets (PLT) count and prolonged prothrombin time (PT) were high risk factors for early death (P <0.05). The increases of IL-5, IL-6, IL-10, IL-12p70 and IL-17A were closely related to the early death of newly diagnosed APL patients, and the increases of IL-5 and IL-17A also induced coagulation disorder in APL patients by prolonging PT (P <0.05). In newly diagnosed APL patients, ferritin and LDH showed a positive effect on the expression of IL-5, IL-10 and IL-17A, especially ferritin had a highly positive correlation with IL-5 (r =0.867) and IL-17A (r =0.841). Moreover, there was a certain correlation between these five high-risk cytokines, among which IL-5 and IL-17A (r =0.827), IL-6 and IL-10 (r =0.823) were highly positively correlated.@*CONCLUSION@#Elevated cytokine levels in newly diagnosed APL patients increase the risk of early bleeding and death. In addition to the interaction between cytokines themselves, ferritin and LDH positively affect the expression of cytokines, thus affecting the prognosis of APL patients.

Investigation on a case of Amanita neoovoidea poisoning / 中华劳动卫生职业病杂志

This paper reported a case of poisoning caused by ingestion of Amanita neoovoidea. The patient experienced nausea, vomiting, oliguria, acute renal function injury, and was discharged after symptomatic support treatment and blood purification treatment. Given the different toxicity of different mushrooms, species identification of poisonous mushrooms can help clinicians in diagnosis and treatment.

Advances in the role of natural products in human gene expression / 中国天然药物

Natural products (NPs), especially those from traditional herbal medicines, can evidently modulate human gene expression at multiple levels, leading to a wide diversity of bioactivities. Although numerous bio-functions of NPs for human body have been found, there is little understanding about how NPs achieve it, as less attention was drawn to the definite mechnism by which NPs regulate gene expression. Furthermore, based on the rapidly advancing knowledge of mechanisms for gene regulation in recent years, newly-understood mechanisms, such as post-transcriptional regulation, are found to be involved in NP-elicited bio-effects, providing a new perspective on understanding the role of NPs in gene expression. Therefore, in the current review, we summarize the function of NPs in gene expression from the perspectives of transcriptional, post-transcriptional, and post-translational regulation, which will reinforce the understanding of NP-induced effects in gene expression and facilitate the exploration of more NPs with potential therapeutic effects.

Pathogenesis effect of serum chromium on oral cancer based on propensity score matching / 中华疾病控制杂志

Objective To evaluate the effect of serum chromium on oral cancer after adjusting the covarite between groups based on propensity score matching (PSM). Methods We performed a case-control study in 395 cases of newly diagnosed primary oral cancer from the First Affiliated Hospital of Fujian Medical University and 1 240 controls from the same community from January 2010 to February 2018. Using the PSM to select 309 controls randomly which were matched with the cases by 1 ∶1 matching. Conditional Logistic regression model was used to explore the association between chromium and oral cancer. Results The level of serum chromium was 178.91 (121.83-284.19) μg/L in the case group, which was lower than 324.27 (264.82-397.69) μg/L in control group, the difference was statistically significant (P＜0.001). Dose-response analysis showed that the risk of oral cancer gradually decreased with the increase of serum chromium, which presented a negative correlation. There was a negative correlation between serum chromium level and the risk for oral cancer by conditional Logistic regression,the aOR of serum chromium in the Q2, Q3 and Q4 compared with the Q1 were 0.14 (0.08-0.26), 0.15 (0.08-0.28) and 0.10 (0.05-0.20),with significant trend (Ptrend＜0.001). Stratified analysis showed the negative correlation between serum chromium and oral cancer by smoking, drinking tea, not drinking alcohol status and fish, fruits and green vegetables intake frequencies. Conclusions The high level of serum chromium is a protective factor for the incidence of oral cancer, and the higher of serum chromium, the lower risk of developing oral cancer.

Mechanism of effective components of Mori Folium in alleviating insulin resistance based on JNK signaling pathway / 中国中药杂志

A stable hepatoma cell line(Hep G2 cell) insulin resistance model was established and used to analyze the effect of effective components of Mori Folium in alleviating insulin resistance,and preliminary explore the mechanism for alleviating insulin resistance. The Hep G2 insulin action concentration and the duration of action were investigated using the glucose oxidase method(GOD-POD method) to establish a stable Hep G2 insulin resistance model. Normal control group,model group,Mori Folium polysaccharide group,Mori Folium flavonoid group and rosiglitazone group were divided to determine the glucose consumption. The effect of Mori Folium effective components on Hep G2 insulin resistance was analyzed. The mRNA expressions of JNK,IRS-1 and PDX-1 in each group were detected by Real-time quantitative PCR(qRT-PCR). The protein expressions of p-JNK,IRS-1 and PDX-1 were detected by Western blot. And the mechanism of effective components of Mori Folium in alleviating insulin resistance was investigated. The results showed that the glucose consumption was significantly decreased in the insulin resistance cells after incubation with 25. 0 mg·L-1 insulin for 36 h(P<0. 01),and the model was relatively stable within 36 h. Mori Folium polysaccharides and flavonoids all alleviated insulin resistance,among which Mori Folium flavonoids had better effect in alleviating Hep G2 insulin resistance(P<0. 05). The qRT-PCR analysis showed that Mori Folium polysaccharides and flavonoids could inhibit JNK and IRS-1 mRNA expressions,while enhancing PDX-1 mRNA expression. Western blot analysis displayed that Mori Folium polysaccharides and flavonoids could inhibit p-JNK and IRS-1 protein expressions,while enhancing PDX-1 protein expression. Mori Folium polysaccharides and flavonoids can alleviate insulin resistance in Hep G2 cells,and its mechanism may be the alleviation of insulin resistance by inhibiting JNK signaling pathway.

Risk assessment on occupational hazards in automobile maintenance industry / 预防医学

Objective To investigate the occupational hazards in automobile maintenance industry in Hangzhou and to provide field-research based evidence for prevention and control. Methods We visited 12 workshops of automobile maintenance to investigate the actors of occupational hazards, examine the protective facilities, and evaluate the occupation-related risk using MES method. Results The factors of occupation-related hazards at polishing posts met the criteria. At the painting posts in the painting room, the factors of chemical hazards satisfied the criteria, however, the levels of xylene and butyl acetate exceeded the standard lines in some enterprises when the ventilation system was close. The noise was higher than the limit at a few posts of sheet metal. The ventilation in spray paint room and the dust collector in dry mill room work well. The risks of occupational hazards at grinding, painting, and sheet metal posts were slightly harmful. Conclusion The occupational hazard factors in automobile repair enterprises were much more complicated. The noise hazard of the sheet metal posts was relatively prominent.

Effect of phosphoinositide 4-phosphate on invasion and migration of human glioma U87 cells / 中国当代儿科杂志

<p><b>OBJECTIVE</b>To investigate the effect of phosphoinositide 4-phosphate (PI4P) on human glioma U87 cells and the mechanism of action of PI4P in the development of human glioma through the overexpression or silencing of PI4P in human glioma U87 cells, and to provide a new target for basic research and clinical treatment of glioma.</p><p><b>METHODS</b>LV-Helper1, LV-Helper2, pWPXLd-PI4P, and pLL3.7-shPI4P were used to package pWPXLd-PI4P and pLL3.7-shPI4P lentiviruses. The U87-GFP (PI4P-overexpression control group), U87-GFP-PI4P (PI4P-overexpression experimental group), U87-Scramble (PI4P-silencing control group), and U87-shPI4P (PI4P-silencing experimental group) cell lines were established. Wound-healing assay and Transwell assay were used to evaluate cell migration and invasion, and Western blot was used to measure the expression of PI4P in each group.</p><p><b>RESULTS</b>Western blot detected the expression of exogenous PI4P in the U87-GFP-PI4P cell line, and the U87-shPI4P cell line showed reduced expression of PI4P compared with the U87-Scramble cell line in the control group. The U87-GFP-PI4P cell line with PI4P overexpression had a significantly stronger ability of migration than the U87-GFP cell line in the control group (P<0.01); the U87-shPI4P cell line with PI4P silencing had a reduced ability of migration than the U87-Scramble cell line in the control group (P<0.01). The U87 cell line with PI4P overexpression had a significantly stronger invasion ability than the control group (P<0.05); after PI4P silencing, the experimental group showed a significant reduction in invasion ability compared with the control group (P<0.05).</p><p><b>CONCLUSIONS</b>In human glioma U87 cells, PI4P can promote the invasion and migration of glioma cells and may become a new target in the basic research and clinical treatment of glioma.</p>

Variation and correlation analysis on phenotypic traits of Scutellaria baicalensis from different strains / 中国中药杂志

To research the differences and correlation between Scutellaria baicalensis about phenotypic traits of different strains, 10 aboveground traits and 6 root traits of S. baicalensis in two-year-transplanted plants from 14 different strains were compared respectively, and the SPSS 17.0 statistical software was used for data analysis. It showed that phenotypic traits variation of different S. baicalensis strains was rich and the F value ranged from 3.169 to 71.58. The difference was significant between each other and germplasm 15 performs the most outstanding characters. Correlation analysis showed that there existed a significant correlation between the characters except for lateral root number, root diameter and length. The correlation coefficient between the fresh weight of root and the reed head diameter was up to 0.877. Principal component analysis showed that the average of overall yield per plant and root diameter could be used as the comprehensive reference index for germplasm evaluation. The differences and correlations in phenotypic traits of different S. baicalensis strains, provide theoretical basis for distinguishing germplasm and breeding good varieties of S. baicalensis.

Anatomical characteristics and surgical selections of upper lumbar disc herniation / 中国骨伤

<p><b>OBJECTIVE</b>To explore the anatomical characteristics and surgical selections of upper lumbar disc herniation, and evaluate its clinical effects.</p><p><b>METHODS</b>From January 2009 to January 2013, 26 patients with upper lumbar disc herniation were treated in our department. There were 16 males and 10 females, aged from 28 to 51 years old with an average of 45.7 years, 4 cases were in L₁,₂, 9 cases in L₂,₃, and 13 cases in L₃,₄. The data was collected including distance between outer edge of lower facet and the spinous process, the outer edge of the isthmus and spinous process, the lower edge of lamina and the upper edge of the intervertebral space, nerve root arising points and lower edge of the corresponding pedicle. Transforaminal discectomy and interbody fusion combined with pedicle screw fixation was performed in patients with L₁,₂, L₂,₃ herniated disk and 5 patients with L₃,₄ herniated disk complicated with lumbar instability. However another 8 patients with L₃,₄ herniated disk were treated with posterior fenestration decompression. Clinical effects were evaluated by Japanese Orthopaedic Association(JOA). The relative height rate(R) of the intervertebral space was measured preoperatively and 1 year postoperatively. The fusion of the bone graft was also observed.</p><p><b>RESULTS</b>Intraoperative anatomical measurement was taken in all patients. All patients were followed up for more than 1 year with an average of 16 months, and all incisions got healing, JOA was improved from preoperative(10.13±1.49) points to last follow up (25.21±2.13) points with the improvement rate of 79.9%. Among the patients underwent fusion operation, 17 cases obtained bone fusion and 1 case maybe non fusion and no internal fixation failure was found;the R value was (0.231±0.056) mm preoperatively, however (0.345±0.076) mm at 1 year after operation with statistical difference(<0.05). In the patient underwent posterior fenestration decompression, the R value was(0.243±0.036) mm preoperatively, and (0.212±0.046) mm at 1 year after operation without statistical difference (>0.05). No spinal instability and lumbar disc herniation recurrence were found in these patients.</p><p><b>CONCLUSIONS</b>According to the anatomical characteristics of L₁,₂ and L₃,₄ herniated disk, these patients could be treated with transforaminal discectomy and interbody fusion. The anatomical characteristics and clinical manifestations of L₃,₄ herniated disk is similar with the lower lumbar disc herniation, for the patients, an appropriate surgical method should be chosen according to the lumbar stability.</p>

Viability of 7 kinds of medicinal plant seeds stored in medium-term gene bank of the National Medicinal Plant Gene Bank / 中国中药杂志

In order to evaluate seed viability of Platycodon grandiflorum, Schizonepeta tenuifolia, Andrographis paniculat, Codonopsis pilosula, Scutellaria baicalensis, Leonurus japonicus, Rabdosia rubescens, stored in the medium-term gene bank of the National Medicinal Plant Gene Bank for 4 years, we tested seed germination rate of 7 species of medicinal plant and analyzed the change of significance of levels of the germination rate in pre and post store. Seed germination rates of 7 species of medicinal plants were all decreased after 4 years, and the decrease of S. tenuifolia and S. baicalensis germination rates were much smaller than other species. The higher initial germination rate of P. grandiflorum, C. pilosula, R. rubescens seed has the smaller decline of germination rate, but the data of A. paniculata showed the opposite trend. The rate decline of the germination of S. tenuifolia and S. baicalensis was roughly the same in different germination rate interval. The results showed that low temperature storage could effectively prolong the seed longevity, and maintain the seed vigor. Moreover, it is necessary to study on the storage characteristics of the main medicinal plant seeds, and establish the monitoring plan and regeneration standard.

Establishment of a cell suspension culture system of endangered Aquilaria sinensis (Lour.) Gilg / 药学学报

Aquilaria sinensis callus induced by stem tips were used to establish the suspension cell system. The results showed that the most suitable medium for callus induction and subculture is MS + 2.0 mg x L(-1) NAA + 1.0 mg x L(-1) 6-BA. After 12 times of subculture, the energetic and loose callus, which were appropriate for cell suspension culture, were cultured and shook in liquid medium MS + 2.0 mg x L(-1) NAA + 1.0 mg x L(-1) 6-BA + 500.0 mg x L(-1) casein hydrolysate (CH) to establish the suspension cell system. The growth curve of suspension cells showed a "S" type. At the beginning of the culture, cell density increased slowly; during 4 to 6 days, suspension cells reached logarithmic growth period; during 7 to 12 days, suspension cells were in the platform period; but after 12 days, cell density and activity went down obviously. Agarwood sesquiterpenes were not detected in the suspension cells during the growth period, however, they could be detected in MeJA treated suspension cells. In this study, a stable and active growing suspension cell system was established, which was a proper system to study the mechanism of agarwood sesquiterpene formation, and additionally provided a potential way to generate agarwood sesquiterpenes through application of cell culture.

Studies on high efficient plant regeneration system from anther callus of Bupleurum chinense / 中国中药杂志

The callus of Bupleurum chinense with anthers at the stage of uninucleate was induced. After several subcultures, anther calli of B. chinense were cultured at 20 MS culture mediums with different plant hormones to differentiate into plantlets. Differentiation of callus was detected after 21 and 49 days to select the most effective medium. There were 19 culture mediums in which anther callus could differentiate into plantlets with differentiation rate range from 3% to 60% , and most less than 20%. MS + KT 0.5 mg x L(-1) + sucrose 30 g c L(-1) + phytagel 5 g x L(-1) was the best differentiation medium with the differentiation rate of 60%, followed by MS + ZT 1.0 mg x L(-1) + sucrose 30 g x L(-1) + phytagel 5 g x L(-1) with the differentiation rate of 58%. Then plantlets were transferred to rooting medium to obtain whole plant. All plantlets could root in the rooting medium of MS + sucrose 30 g x L(-1) + phytagel 5 g x L(-1) and 1/2 MS + NAA 0.5 mg x L(-1) + sucrose 30 g x L(-1) + phytagel of 5 g L(-1) with the rooting rate of 100%. As a result, the high efficient and stable plant regeneration system was established from anther callus of B. chinense.

Isolation and identification of pathogen of seedling blight of Platycodon grandiflorum / 中国中药杂志

<p><b>OBJECTIVE</b>To isolate and identify pathogen of the seedling blight occurred in Platycodon grandiflorum.</p><p><b>METHOD</b>The morphological observation, rDNA ITS sequence analysis, and Koch's postulates were used to identify the isolates of the causal agent.</p><p><b>RESULT</b>The isolates of the causal agent was Rhizoctonia solani.</p><p><b>CONCLUSION</b>The result confirmed that R. solani is the pathogen of seedling blight of P. grandiflorum.</p>

Study on the relationship between Chinese medicine constitutive susceptibility and diversity of syndrome in diabetic nephropathy / 中国结合医学杂志

<p><b>OBJECTIVE</b>To explore the relationship between Chinese medicine (CM) constitutive susceptibility and syndrome diversity in diabetic nephropathy (DN).</p><p><b>METHODS</b>Epidemiologic investigation on constitution adopting the "Constitution in Chinese Medicine Questionnaire" (CCMQ), and survey on syndrome type by CM syndrome scale (preliminary) were carried out in 180 DN patients. Cluster analysis on symptom items was used to determine the syndrome type, and canonical correlation analysis was used to analyze the relationship between patients' constitution and syndrome.</p><p><b>RESULTS</b>Baseline levels in all enrolled patients were not different statistically. Cluster analysis showed 8 syndromes existed in DN patients, namely: I, qi-yin deficiency with qi-stagnancy type; II, yin-yang deficiency with heat-water-blood stasis type; III, qi-yin deficiency with dampness-heat type; IV, yin-yang deficiency with blood-stasis and heat type; V, qi-yin deficiency with stagnant heat type; VI, yin-yang deficiency with inner dampness-heat stagnancy type; VII, yin deficiency with heat stagnancy type; and VIII, Kidney (Shen)-Spleen (Pi) deficiency with stagnant heat type. Correlation analysis on the 8 syndromes and the 9 constitutions showed statistical significant correlations between syndrome III and dampness-heat constitution (P=0.0001); syndrome IV and blood-stasis constitution (P=0.0001); and syndrome VII and yin-deficiency constitution (P=0.0180).</p><p><b>CONCLUSION</b>Certain relationship revealed between CM constitutions and syndrome types; constitution decides the disease genesis, its syndrome type and prognosis, as well as the change of syndromes.</p>

Biological limit value for occupational exposure to N, N-dimethylacetamide / 中华劳动卫生职业病杂志

<p><b>OBJECTIVE</b>To establish Biological Limit Value (BLV) for N, N-dimethylacetamide (DMAC).</p><p><b>METHOD</b>201 workers in 3 spandex factories exposed to DMAC were recruited. Air samples were collected using personal air samplers, and urine samples from each works were collected at the end of shift at end of workweek. The urinary metabolite NMAC and air samples of DMAC were determined by gas chromatography (GC). Percentile and relative internal exposure (RIE) were analyzed and proposed a BLV for DMAC.</p><p><b>RESULTS</b>The number of workers who exposure to DMAC below OELs were 133 (66.2%) among 201 workers monitored. Geometric mean (range) concentration of DMAC in air was 19.4 (0.40 ∼ 300.12) mg/m(3), and that of NMAC in urine was 23.7 (1.30 ∼ 189.42) mg/g Cr. A linear correlation was found between the personal air DMAC and creatinine-adjusted NMAC levels in urine collected at the end of shift at end of workweek (F = 188.872, R(2) = 0.487,P < 0.001). The relationship can be described by the equation Log (NMAC mg/g Cr) = 0.685 + 0.455 log (DMAC mg/m(3)). According to the equation the current China OELs value of 20 mg/m(3) would lead to a mean NMAC concentration of 18.92 mg/g Cr. The 90th percentile biomonitoring result below 20 mg/m(3) 8-hour TWA is 23.9 mg MMAC mg/g Cr, and that of NMAC in urine calculated by relative internal exposure (RIE) was 19.0 mg/g Cr.</p><p><b>CONCLUSION</b>A BLV of 20 mg/g Cr NMAC in urine at the end of shift at end of workweek for DMAC was recommend by reference to official values from other countries.</p>

Association of Chinese medicine constitution susceptibility to diabetic nephropathy and transforming growth factor-β1 (T869C) gene polymorphism / 中国结合医学杂志

<p><b>OBJECTIVE</b>To explore the association of Chinese medicine constitution susceptibility to diabetic nephropathy (DN) and transforming growth factor (TGF)-β1 (T869C) gene polymorphism.</p><p><b>METHODS</b>TGF-β1 gene polymorphism detected with polymerase chain reaction-restriction fragment length polymorphism (PCR-RFLP) was screened for 180 DN cases and 180 type 2 diabetic mellitus (T2DM) cases without combined DN. Patients with DN were surveyed epidemiologically with constitution in the Chinese medicine questionnaire (CCMQ). Binary logistic regression analysis was utilized to study the correlation between nine types of Chinese medicine constitution and TGF-β1 (T869C) gene polymorphisms.</p><p><b>RESULTS</b>The DN group has a higher frequency of TGF-β1 (T869C) gene polymorphism than the T2DM group, and CC/CT genotypes than the T2DM group [CC, CT, TT (DN group): 88, 87, 5 (cases) versus (T2DM group) 71, 73, 36 (cases), P<0.05]. The phlegm-dampness constitution, damp-heat constitution, and blood stasis constitution have correlations with TGF-β1 (T869C) gene polymorphism.</p><p><b>CONCLUSION</b>Chinese medicine constitutions were associated with TGF-β1 (T869C) gene polymorphism, a potential predictor of susceptibility to DN in T2DM patients.</p>

T2 mapping of articular cartilage in the healthy knee using a magnetic resonance segmentation / 中国医学科学院学报

<p><b>OBJECTIVE</b>To evaluate T2 mapping of the healthy knee articular cartilage in different subregions using a magnetic resonance segmentation.</p><p><b>METHODS</b>T2 mapping was performed to 77 healthy tibiofemoral cartilages, which were divided into group H1 ( <40 years old) and group H2 (≥ 40 years old). T2 values of cartilage IN 10 subregions based on the Whole-Organ Magnetic Resonance Imaging Score (WORMS) segmentation and body mass index (BMI) were calculated. T2 values of cartilage in 10 subregions were compared. The association between T2 value and BMI/age was analyzed. The intra- and inter-observer reproducibility of measurement was calculated.</p><p><b>RESULTS</b>The T2 values of all the subregions ranged 40. 3-53.5 ms. T2 values of group H2 were significantly higher than those in group H1 (P ≤ 0.032) except in posterior lateral femoral subregion. The inter-subregion differences within group were significant (P ≤ 0.001). The inter-gender differences were significant only in posterior medial tibial subregion of group H2 (P=0.048). No correlation of T2 values with BMI was found except in cetral lateral tibial subregion of group H2 (P=0.050, R=0.308). T2 values were correlated with age in anterior medial (P=0.004, R=-0.467) and anterior lateral P = 0.024, R=-0.375) tibial subregion of group H1 , and in all tibial subregion except anterior lateral tibial subregion of group H2 , and central medial femoral subregion of group H2 (P=0.004~0.015, R=0.376~0.437). The correlation coefficients for intra- and inter-observer of measurement showed good reproducibility (R>0.809, P ≤ 0.005).</p><p><b>CONCLUSION</b>T2 mapping of the healthy knee articular cartilage based on the WORMS segmentation can effectively reflect the changes and correlations of T2 values with risk factors by focusing on the functional weight-bearing subregions.</p>

Determination of trimethyltin chloride in urine by headspace-gas chromatography / 中华劳动卫生职业病杂志

<p><b>OBJECTIVE</b>To establish a detection method for trimethyltin chloride in urine by the Head space-GC.</p><p><b>METHOD</b>After derivatizing trimethyltin chloride, the urines was separated by the head space-gc, and then the trimethyltin chloride detected qualitatively and quantificationally.</p><p><b>RESULTS</b>In the concentration range of 0.02 ∼ 0.40 mg/L urinary trimethyltin chloride, showed a quadratic, r = 0.9992, detection limit was 0.005 mg/L, the relative standard deviation was 1.9% ∼ 2.5%, recovery was 92.0% to 100%, the urine samples can be saved at least 90 days in -18°C refrigerator.</p><p><b>CONCLUSION</b>The instrument, reagents involved in the detection require low, the operations to processing samples are simple, high sensitivity, less interference, good reproducibility, and suitable for quantitative and qualitative analysis, convenient to promotion.</p>

The interventions effect-assessment of the workers exposed to N, N-dimethylformamide by percutaneous in a synthetic leather factory / 中华劳动卫生职业病杂志

<p><b>OBJECTIVE</b>To assess the effects of interventions on synthetic leather workers exposed to N, N-dimethylformamide (DMF) by skin.</p><p><b>METHODS</b>Twenty-six workers exposed to DMF were recruited. The level of DMF in ambient or handwash solution and N-methylformamide (NMF) in end-shift urine samples were detected before interventions and after interventions for six months.</p><p><b>RESULTS</b>After interventions the levels of DMF in ambient reduced 52.7% from (63.27 +/- 52.67) mg/m3 to (29.95 +/- 23.79) mg/m3. The levels of NMF in urine samples reduced 17.9% from (2.07 +/- 0.32) mg/g Cr to (1.70 +/- 0.29) mg/g Cr (P < 0.01). The mean level of DMF in handwash solution reduced 53.4% from 0.88 +/- 0.40 mg to 0.41 +/- 0.81 mg.</p><p><b>CONCLUSION</b>This study showed that the multi-intervention measures (engineering control, personal protection and health promotion) should be used for the synthetic leather workers occupationally exposed to DMF.</p>