Objective To develop a field medical equipment maintenance trailer for patrol inspection and maintenance of medical equipment in wartime and peace time.Methods A field medical equipment maintenance trailer was constructed with the components of a shelter,a chassis,an electrical system and etc.The shelter had a power supply area on the front side,two working areas on left and right sides,a control area on the rear side and a support mechanism covered with a rainproof tarpaulin;The chassis was composed mainly of a frame,a traction mechanism,a steering mechanism,a suspension,a braking system and etc;the electrical system was made up of a power supply unit and a control unit.Results The maintenance trailer carrying a variety of maintenance tools and spare parts was trailed with the transport vehicle during maneuvering and driven electrically during equipment maintenance,which was ready for use immediately after deployment so as to meet the needs for rapid maintenance of medical equipment.Conclusion The maintenance trailer gains advantages in internal layout,mobility and security,and can be used to inspect and maintain medical equipment and to transport spare parts and maintenance tools.[Chinese Medical Equipment Journal,2023,44(11):114-116]

Objective To compare the setup accuracies of the surface-guided radiation therapy for nasopharyngeal carcinoma based on volume rendering technique(VRT)reference surface and digital imaging and communications in medicine(DICOM)reference surface.Methods Twenty patients with nasopharyngeal carcinoma who received radiotherapy using the customized AccuCushion with a thermoplastic fixation mask were selected.After the first cone beam CT(CBCT)-based image-guided radiotherapy of each patient was completed,the thermoplastic mask was removed to obtain the VRT reference surface based on optical surface monitoring system(OSMS),during which the patient position was maintained through instructions;the DICOM reference surface was got based on the body surface contour data extracted from the patient's localized CT images.After the completion of the 5th,10th,and 15th CBCT image-guided radiotherapy treatments,the patients'6 dimensions of setup errors were measured based on the 2 reference surfaces,respectively.Dimensional correlation analyses were carried out on the setup errors measured based on the 2 reference surfaces separately using Python's Stats tool to test the independence between the setup errors in each dimension.After independence test,Wilcoxon rank sum test was performed on the data of the setup errors based on each dimension measured with the 2 reference surfaces.Results The two sets of setup errors were independent of each other in all dimensions.The errors based on VRT reference surface were lower than those based on DICOM reference surface in 6 dimensions,while the difference between the 6-D errors of the two groups did not gradually become significant as the treatment progressed.Conclusion In the SGRT of nasopharyngeal carcinoma using a customized cushion combined with a thermoplastic mask,the setup accuracy and consistency based on VRT reference surface are both higher than those based on DICOM reference surface.

Objective: To investigate the sleep quality of video operators in Shenzhen, and explore the relationship between sleep quality and occupational stress and different work and life habits. Methods: In December 2020, a cluster sampling method was used to investigate 791 video operators in Shenzhen from June to December 2020 who were engaged in printing, design, IT and other industries. The Pittsburgh Sleep Quality Index Scale was used to investigate the sleep quality of video operators, and the Job Content Questionnaire was used to investigate the occupational stress of video operators, The Pay Return Imbalance Questionnaire was used to investigate the pay return imbalance of video operators. The measurement data conforming to the normal distribution shall be expressed by mean±standard deviation, and t-test, analysis of variance and linear correlation analysis shall be adopted according to the type of independent variable. Those that do not conform to the normal distribution are described by the median M (Q(1), Q(3)), and two sample Wilcoxon test is used according to the binary data of independent variable type. Kruskal Wallis test was used for multi classification data, and Spearman rank correlation was used for single factor analysis for ordinal classification data. The counting data were analyzed by chi square test or Fisher exact probability method. Logistic regression was used for multivariate analysis. Results: the pittsburgh sleep quality index was 4.76±2.86. 499 of them had high sleep quality. 292 people had low sleep quality, accounting for 36.91% (292/791). Compared with the low sleep quality group, the high sleep quality group had lower work requirement scores (13.48±1.77), higher autonomy scores (24.08±3.33), higher social support scores (23.95±3.08), lower pay scores (16.11±2.63), higher return scores (31.11±3.65), and lower internal input scores (14.98±2.55). There were statistically significant differences between the two scales in each dimension index group (P<0.05). Multi factor unconditional logistic regression analysis showed that high education level (OR=1.57, 95%CI=1.26~1.98, P<0.05), occupational stress (OR=1.69, 95%CI=1.21~2.36, P<0.05), and high pay and low return (OR=1.41, 95%CI=1.01~1.96, P<0.05) were the main influencing factors of sleep quality. Conclusion: The occurrence of occupational stress in video operators is a risk factor for low sleep quality, which should be paid enough attention.
Humans ; Stress, Psychological/epidemiology* ; Computer Terminals ; Sleep Quality ; Cross-Sectional Studies ; Occupational Stress/epidemiology* ; Surveys and Questionnaires

Aim To study whether ginsenoside Rg1 could improve white matter injury caused by chronic cerebral ischemia.Methods C57BL/6 mice were randomly divided into Sham group,Model group,Donepezil group,and ginsenoside Rg1(10,5 mg·kg-1)group.BCAS was established by using bilateral common carotid artery stenosis.Drug treatment was started one day after the operation,and the stomach was given continuously for 30 days.During this period,the body weight and CBF changes were observed,and observed by climbing rods,new object recognition and Y maze experiments.The movement coordination and cognitive abilities of each group of animals were improved.The improvement of the myelin sheath of the corpus callosum was detected by LFB staining,the damage of corpus callosum neurons was observed by Nissl staining,and the expression level of MBP in the corpus callosum was detected by immunofluorescence and Western blot.Results The test results of body weight and CBF showed that compared with model group,ginsenoside Rg1 group did not significantly improve the animal's body weight and CBF values; the results of climbing rod,new object recognition,and Y maze experiment showed that ginsenoside Rg1 group significantly shortened the time it took animals to climb rods,and improved the animal's new object recognition index and the number of autonomous alternations; LFB and Nissl staining results showed that ginsenoside Rg1 group significantly improved the myelin and neuron damage of the animal corpus callosum.The results of immunofluorescence and Western blot showed that ginsenoside Rg1 group significantly increased the expression level of animal myelin basic protein MBP.Conclusion Ginsenoside Rg1 can significantly improve white matter injury caused by chronic cerebral ischemia.

Five cadinane-type sesquiterpenoids were isolated from the n-hexane extract of Commiphora myrrha by using various chromatographic techniques, including silica gel, ODS and semi-preparative HPLC. Their structures were identified by physicochemical properties and spectroscopic data. These compounds were defined as (3S,4R)-3,9-dimethoxymyrrhone (1), 9-methoxymyrrhone (2), myrrhone (3), commiterpene B (4) and comosone Ⅱ (5). Compound 1 is a new compound, of which the absolute configuration was established by single crystal X-ray crystallographic analysis. Compound 5 is firstly isolated from the Commiphora genus.

The transcription factor X-box binding protein-1 (XBP1) plays a key role in unfolded protein reaction. This study was aimed to investigate the expression pattern and regulation of XBP1 in the mouse uterus during early pregnancy. The methods of immunohistochemistry (IHC) and real time quantitative RT-PCR were used to test XBP1 expression in early pregnancy, artificial decidualization, oestrous cycle and hormone-regulated mouse models. The results showed that XBP1 was spatiotemporally expressed in mouse uterus during early pregnancy. The XBP1 protein was mainly detected in the luminal and glandular epithelia on days 1-4 of pregnancy, and was strongly detected in the decidual area on days 5-8 of pregnancy. Similarly, XBP1 expression was also mainly expressed in decidual cells following artificial decidualization. During the oestrous cycle, Xbp1, Xbp1u, and Xbp1s mRNA was predominantly present in proestrus. In the ovariectomized uterus, the expression of XBP1 in luminal and glandular epithelia was up-regulated after estrogen treatment. These results suggest that XBP1 is associated with embryo implantation and decidualization during early pregnancy in mice, and the expression of XBP1 in luminal and glandular epithelia may be regulated by estrogen.
Animals ; Decidua ; Embryo Implantation ; Estrogens ; Female ; Mice ; Pregnancy ; RNA, Messenger/genetics* ; Uterus

This study aims to study the chemical components from the gum resin of Boswellia carterii. Five cembranoid diterpenes were isolated from the gum resin of B. carterii by various of column chromatographies including silica gel, Sephadex LH-20, and semi-preparative HPLC. Their structures were identified on the basis of physicochemical properties, mass spectrometry(MS), nuclear magnetic resonance(NMR), Ultraviolet(UV) and infrared(IR) spectroscopic data. These compounds were identified as(1S,2E,4R,5S,7E,11E)-4-methoxy-5-hydroxycembrane(1),(1R~*,4R~*,5E,8E,12E,15E)-4-hydroxycembra-5,8,12,15-tetraene(2), cembrene A(3),(3S,4S,7R)-4-hydroxycembrane(4), and pavidolide D(5). Compound 1 was a new compound. Compounds 2, 4, and 5 were obtained from the gum resin of B. carterii for the first time. Compound 2 showed weak inhibition on the human liver cancer cell line HepG2.
Boswellia ; Cell Line ; Diterpenes ; Humans ; Molecular Structure ; Resins, Plant

Objective:To establish a comet test method for detection of genotoxicity of three reference chemicals in rat liver cells. Methods:6-10 week old Sprague Dawley rats were randomly divided into 4 groups， with normal saline （0.9% NaCl solution） as negative control group. Animals in three test groups were treated， respectively， with ethyl methanesulfonate （EMS） 200 mg/kg， N-methyl-N-nitrosourea （MNU） 50 mg/kg， and D-mannitol 2 000 mg/kg. There were 10 animals in each group， 5 males and 5 females. The animals received two times （21 h interval） of test compounds through intragastric administration， and their clinical symptoms and body weight changes were recorded during the experiment. The rats were sacrificed 3 h after the last exposure. The liver was weighed， then used to prepare single-cell suspensions for the alkaline comet test which determines the average tail DNA content percentage （DNA%） of hepatocytes and other comet indicators. Results:（1） D-mannitol， EMS and MNU did not show significant toxicity in the whole animal. （2） The mean values of tail DNA content percentage （DNA%） of rat hepatocytes in EMS ［（60.07±24.69）%］ and MNU ［（41.66±22.35）%］ groups were higher than that in the negative control group ［（2.32±1.39）%］ and the difference was statistically significant （P<0.05）. The difference between D-mannitol group ［（3.06±3.30）%］ and the negative control group was not significant （P>0.05）. Conclusion:This laboratory has established a comet test method using hepatocytes from treated rats. Among three testing chemicals， EMS and MNU have displayed genotoxicity by this assay， but no genotoxicity was observed in D-mannitol treated animals.