Hypoxia is a common physiological and pathological stimulus in many human diseases .The cellular oxygen sensors and the following activation of multiple cellular signal transduction pathways involved in hypoxia responses can regulate cell survival as well as respiration , blood circulation , metabolism and so forth .The cell response to hypoxia has a complex diversity .Hypoxia-induc-ible factor ( HIF) pathway in an oxygen dependent manner plays a central role during the hypoxia response .The HIF-independent path-ways are equally important under hypoxic conditions which can maintain the oxygen balance and metabolism balance .

Objective High mobility group box 1 (HMGB1) mediates the inflammatory immune response as well as the prolif-eration, differentiation and migration of cells , neverthless, little study has been done on the changes of HMGB 1 expression in hepatoma tissues.The aim of the article was to investigate the changes of HMGB 1 mRNA and protein expression in hepatocellular carcinoma (HCC) tissues. Methods Real-time fluorescence quantitative PCR and Western blotting were applied to detect HMGB 1 mRNA and protein expression in HCC tissues and their paracancerous tissues of 13 cases.Immunofluorescence localization was used to analyze the changes of HMGB1 distribution in hepatic cells . Results The expression of HMGB1 mRNA and protein in HCC tissues (4.01 ±0.81) and (1.37 ±0.34) increased significantly in comparison with those in paracancerous tissues (5.76 ±1.28) and (0.52 ±0.12) ( P<0.01).Nucleo-cytoplasmic translocation of HMGB1 was observed in hepatocarcinoma cells . Conclusion There is increased expression of HMGB1 in HCC tissues, which shows HMGB1 mediates the carcinogenesis of HCC .

Objective To investigate the expression of minichromosome maintenance protein 7 (MCM7) in sinonasal squamous cell carcinoma (SNSCC),and evaluate its relationship with tumor differentiation and prognosis of patients.Methods Using immunohistochemistry,MCM7 expression in SNSCC and nasal polyps with chronic sinusitis (NPCRS) were studied,and relationships between markers and clinicapathological features were analyzed.Results In NPCRS,MCM7 positive cells were mainly distributed in the epithelial basal layer and the expression rate was low,whereas in SNSCC,MCM7 positive cells were diffuse and the expression rate was high.MCM7 expression was significantly higher in SNSCC than in NPCRS (P ＜ 0.001) and related to tumor differentiation (P =0.001),increasing gradually with decreasing degree of differentiation.The overall 3-and 5-year survival rates of patients with SNSCC were 61.3％ and 46％,respectively.The 3-year survival rates for patients with stage Ⅰ and Ⅳ were 90％ and 25.6％,respectively,and the 5-year survival rates were 70％ and 17.1％,respectively;the difference was statistically significant (P ＜ 0.001).The 3-and 5-year survival rates of MCM7-negative patients were 36.0％ and 18.0％,respectively,and those of MCM7-positive patients were 59.9％ and 34.2％,respectively;the difference was not statistically significant (P =0.297).Conclusion In SNSCC,MCM7 expression is significantly increased,inversely associated with the degree of tumor differeutiation,and unrelated to the survival rates of patients.

Objective To evaluate of the quality of life of the aging population in rural areas of the underdeveloped areas of Chongqing ,and analyze its influencing factors ,provide a reference in order to improve their quality of life .Methods Hierarchical sampling was conducted ,474 rural aging people from Qianjiang District and Zhongxian were extracted ,Adopt second edition of the Life quality evaluation Scale (SF-36) was used to describe its quality of life each dimension of score ,the dimension of physical health and mental health dimensions influencing factors were analyzed .Results Among the total score of 474 Zhongxian rural quality of life of the aging population ,median M (interquartile QR) was 78 .00 (30 .00) ,and the physical health dimension M (QR) score was 75 .00 (35 .00) ,mental health dimension M (QR ) score was 76 .00 (20 .00) .Conclusion Their mental health concerns should be strengthen to improve the quality of life of the aging population the main way .

Based on the plasma activation and the sensing ability of cataluminescence, a low temperature plasma-assisted cataluminescence sensor was developed for ethylene detection using the low-cost and abundant alkaline-earth oxides of MgO nanomaterials as the sensing materials.Taking advantage of the high activity of the plasma, the working temperature of this method was greatly decreased than that of traditional detection method (300-500℃), and the sensing of ethylene was realized at room temperature without any heating device.This ethylene cataluminescence sensor gave a linear range of 112-4997 ng/mL (90-3998 ppm, R=0.97669) with a detection limit of 37 ng/mL (30 ppm).Besides, the sensor showed good selectivity and stability in ethylene detection.Due to the absence of the heating element, the present sensor was simple, rapid, low-cost, low energy-consumption and stable for ethylene sensing.This study improved the applicability of cataluminescence sensors and might promote the development of cataluminescence sensors.

Objective To analyze retrospectively the death pattern, risk factors, and death time of 253 patients at the Respiratory Care Unit of General Hospital of PLA in order to improve care quality and reduce mortality.Methods The information of patients was extracted from the hospital information system ( HIS) , and then classified and calculated accord-ing to different time points.Results Between November and next March,the mortality rate was higher than in other months (P<0.05), accounting for 19.5%.Mortality of those admitted between 8∶01 and 9∶00 or between 23∶01 and 24∶00 was higher than at other times(P<0.05), accounting for 41.7%and 50.0%, respectively.There was statistically significant difference(P<0.01) in mortality between days of the week,with the highest on Saturday, accounting for 43.1%.Mortality on non-work days was higher than on workday(P<0.01), accounting for 38.3% and 13.2%, respectively.Mortality at off-hour was higher than at office time(8∶00-11∶30 and 14∶30-18∶00 on workday) (P<0.01), accounting for 31.3%and 5.2%, respectively.Logistic regression analysis showed that age, month of admission, and the hour of discharge were associated with the outcome.Conclusion The high mortality between November and next March may be related to the higher incidence of respiratory diseases in winter, air pollution and cold weather.High mortality is also significantly associ-ated with the care quality of the medical staff.

Objective To observe the effect of hyperbaric oxygen (HBO)on neuropathic pain and detect the expression of Wnt/β-catenin signaling pathway in the mechanism of treatment. Methods A total of 30 healthy male SD rats were randomly divided into three groups (n =10):group S(sham group),group CCI(chronic sciatic nerve constrictive injury group),group HBO(HBO treat-ment for seven days group).Rats of group HBO received HBO one time per day for 7 days since the 1st day after surgery.Rats of group S and group CCI were just placed inside the chamber for approxi-mately 100 min,no HBO treatment.The mechanical withdrawal threshold (MWT)and thermal with-drawal latency (TWL)of all rats were measured on 1 d before CCI,1 d,3 d,5 d,7 d after CCI respec-tively.The animals were sacrificed after the last measurement of pain threshold,and the lumbar spinal cord specimen were taken to detect the expression of Wnt3a,β-catenin by immuno-histochemis-try and Western blot analysis.Results Compared with group S,MWT decreased significantly and TWL shortened significantly in CCT and HBO groups at 1,3,5,7 d after operation (P <0.05).Com-pared with group CCI,MWT was elevated and TWL was prolonged in group HBO at 1,3,5,7 d after operation (P <0.05).The Wnt3a,β-catenin expression increased after CCI treatment compared with group S and group HBO (P <0.05).Compared with group CCI,the expression of Wnt3a,β-catenin decreased significantly in the group HBO and group S at 7 d after operation (P <0.05).There was no significant difference between group S and group HBO.Conclusion HBO post-conditioning may relieve the neuropathic pain of rats by inhibiting the activation of spinal path of Wnt3a,β-catenin.

Objective To evaluate the capability of three tests used alone or in combination for identification of Staphylococcus aureus.Methods Identification of Staphylococcus aureus by the detection of spa gene with PCR and the Vitek-2 system were selected as the reference methods.Comparison of three phenotypic tests including DNase,mannitol fermentation and tube coagulase test was carried out to analyze the sensitivity,specificity,positive/negative predictive value,positive/negative likelihood ratio and Youden index.The consistency,cost and related indexes of the assays were analyzed between the combined phenotypic tests and the reference methods.Results In the present study,324 isolates of Staphylococci,including 293 Staphylococcus aureus and 31 non-Staphylococcus aureus,were collected.Single biochemical test could not identify Staphylococcus aureus efficiently.Comparison between the reference methods and the combined three biochemical tests by Kappa statistic analysis indicated that an overall Kappa value was 0.9441,and the algorithm of combined test was less costly.The sensitivity and specificity of this algorithm were 100％ and 90.3％,respectively.Conclusion The cost-effective algorithm of combined DNase,mannitol fermentation and tube coagulase test could efficiently distinguish Staphylococcus aureus from other Staphylococcus species.

Objective To explore the relationships between the quantitative parameters for contrastenhanced ultrasonography(CEUS) in hepatocellular carcinoma (HCC) and arteries in neoangiogenesis.Methods One hundred and fifteen HCCs in CEUS were analyzed off-line with dynamic vascular curve of ImageArena and immunohistochemical stained in the tissue slices.Parameters including maximum of intensity(IMAX),rise time(RT),time to peak(TTP),mean trasit time corresponding to the center of gravity(mTT) ,rise slope(RS) and washout time(WT) were analyzed by statistics.Unpaired arteries(UAs)of 82 HCC cases were succesfully stained.Results The number of UAs had moderate correlation with RT (r = - 0.446),TTP (r = - 0.432) and RS (r = 0.431) (P ＜ 0.05),and it had mild correlation with IMAX (r = 0.303) ,WT (r = 0.285) (P ＜0.05).Conclusions Neoangiogenesis is a functional adaptation to altered vascular dynamics.Quantitative parameters of CEUS,reflecting hemodynamics of tumors,are correlated with UAs.

Objective:To investigate the influence of preoperative thyroid dysfunction on the 30-day postoperative mortality and complications in elderly patients with hip fracture.Methods:A retrospective analysis was conducted of the 349 elderly patients with hip fracture who had been admitted to Department of Orthopedic Trauma, Beijing Luhe Hospital Affiliated to Capital Medical University from January 2018 to December 2019. They were 108 males and 241 females, with an average age of 76.3 years (from 60 to 104 years). There were 190 femoral intertrochanteric fractures and 159 femoral neck fractures. By the preoperative level of thyroid function, the patients were divided into a normal function group of 290 cases and a dysfunction group of 59 cases. The 2 groups were compared in terms of hospital stay, mortality and incidence of complications within 30 days postoperation.Results:In this cohort, the rate of 30-day postoperative mortality was 3.4%(12/349) and the incidence of 30-day postoperative complications 14.6%(51/349). The 2 groups were comparable because there was no significant difference between them in the preoperative general data except for the preoperative comorbidity of coronary heart disease ( P>0.05). In the dysfunction group, the hospital stay averaged (10.2±6.9) d, the rate of 30-d postoperative mortality 1.7%(1/59) and the incidence of 30-day postoperative complications 16.9%(10/59), which were insignificantly different from those in the normal function group [(10.7±7.5) d, 3.8%(11/290) and 14.1%(41/290), respectively] ( P> 0.05). Conclusion:Since preoperative thyroid dysfunction does not affect the 30-day postoperative mortality and postoperative complications in the elderly patients with hip fracture but no definite thyroid disease, routine thyroid function screening is not recommended for them.