Objective To study the influencing factors of digital image white balance of the biological microscope and the way to obtain optimized image.Methods Color temperature meter was used to measure the influences of the factors and their correlations, and SASS software was employed for statistical analysis.Results Object lens might increase the color temperature by 200 to 300 K, LBD color filter could enhance it by 400 to 1 800 K. Reducing field stop by 90% might decrease color temperature by 400 K. ND6 filter, ND25 filter and aperture diaphragm had no influences on color temperature.Conclusion The electric and optical parameters of biological microscope have to be adjusted to gain proper white balance for digital image.

Objective:This study aims to compare the difference in the expression levels of prostaglandin E2 (PGE2), vascular endotheli-al growth factor (VEGF), and the clinicopathological features among gastric carcinoma patients with and without hyperlipidemia and to assess whether hyperlipidemia promotes gastric carcinoma progression. Methods:We analyzed the PGE2 and VEGF serum levels and the VEGF expression in gastric carcinoma tissues in 102 gastric carcinoma patients. The PGE2 and VEGF serum levels were detected by enzyme-linked immunosorbent assay, and the VEGF expression in gastric carcinoma tissues was detected by SABC immunohistochemi-cal staining. Results:Among the 102 gastric carcinoma patients, 49 patients had hyperlipidemia, and 53 did not have the condition. The PGE2 and VEGF expressions in the serum and the VEGF expression in gastric carcinoma tissues were higher in hyperlipidemic pa-tients than in those without hyperlipidemia (P<0.05). The degrees of differentiation, depths of invasion, lymph node metastasis, and TNM staging in the two groups also showed statistical differences (P<0.05). Conclusion:Hyperlipidemia possibly contributes to the pro-gression of gastric carcinoma by upregulating the PGE2 and VEGF expressions.

Objective: To analyze the characteristics of individuals positive for SARS-CoV-2 nucleic acid in a centralized isolation site for people entering China in Huzhou City of Zhejiang Province from December 18, 2021 to January 12, 2022, so as to provide insights into the prevention and control of overseas imported COVID-19. Methods: The basic characteristics, nucleic acid detection and epidemiological investigations were collected from individuals positive for SARS-CoV-2 nucleic acid in a centralized isolation site for people entering China from December 18, 2021 to January 12, 2022, and the temporal distribution, population distribution, source of importation, and virus typing were descriptively analyzed. Results : From December 18, 2021 to January 12, 2022, a total of 2 974 individuals in 19 flights were recorded in this centralized isolation site, and 33 cases were tested positive for SARS-CoV-2 nucleic acid, including 21 confirmed cases with common type, 9 confirmed cases with mild type, and 3 cases with asymptomatic infections. There were 11 cases with Omicron infections ( 33.33% ), 5 cases with Delta infections ( 15.15% ), and 17 cases with infection of unidentified types ( 51.52% ). The median interval ( interquartile range ) from the time of entry to the time of a positive test was 4.0 ( 7.0 ) days among all positive cases, 0 ( 4.0 ) day among cases with Omicron infections and 4.5 ( 8.5 ) days among cases with infections of Delta and unidentified types. The positive cases had a mean age of ( 36.97±8.58 ) years, and included 27 men (81.82%). There were 30 cases ( 90.91% ) receiving two and more doses of COVID-19 vaccines, and 7 cases ( 21.21% ) with a previous history of SARS-CoV-2 infections. There were 19 cases ( 57.58% ) from African countries, and 7 of 11 cases with Omicron infections were imported from African countries. Conclusion Omicron infection was predominant among individuals positive for SARS-CoV-2 nucleic acid in this centralized isolation site for people entering China from December 18, 2021 to January 12, 2022, with no severe cases detected, and most positive cases were imported from African countries.

Redox state indicated by reactive oxygen species (ROS) level is a cellular physiological feature. Redox status is exactly controlled by conserved system. Its alterations consequently modulate various biological activities and play important roles in cells and organism under physiological and pathological conditions. Hence detection of redox state is deemed as an important technique both in basic and clinical researches. The present article reviews the principle and current applications of fluorescent probes or sensors for redox detection. With comparison of properties of various probes, especially genetic coding fluorescence probes, much understanding will be gained. And the review helps us to understand how to apply the redox probes on the biological and clinical researches and eventually look forward to new applications in the cell and whole animal level.

Objective To analyze the features of cervical vertebra X-ray examination and transcranial Doppler (TCD) in children with cervical vertigo, and investigate the mechanism of the disease. Methods X-ray examination of cervical vertebra and TCD were performed on 80 children with cervical vertigo, and the features of the results were analyzed. Results The abnormal results of cervical X-ray examination mainly showed atlantoaxial joint or/and C2, C3 vertebral joint disorders, some of which combined with cervical instability, cervical curvaturestraightened and even reverse curvature, cervical scoliosis. The abnormal results of TCD showed the blood flow velocity in single or multiple branch of artery increased mainly, some of which decreased or became asymmetrial. Conclusion The cervical vertigo in children may result from various kinds of disorders of the atlas, axis or/and C2, C3 vertebrae.

Objective To investigate the clinical effects and indications of the vacuum sealing drainage (VSD) in the treatment of severe diabetic foot gangrene.Methods We randomly recruited 60 cases,who had suffered from diabetic foot gangrene(DFG) at the grade of 3 -5,according to Wagner scale into VSD treatment groups and treated them with VSD methods.At the same time,62 DFG cases who had given routine drainage treatment one year ago were retrospectively analyzed as control group.The observed items included the wound healing time,number of dressing,outcome of treatment ( healing rate),the average days in hospital,total expenses of hospitalization and so on.Results The wound healing time of VSD treatment group and routine treatment group were ( 30.5 ± 6.8 ) days and ( 53.8 ± 5.5 ) days,respectively ( t =2.636,P ＜ 0.01 ).The numbers of dressing were( 15.0 ± 4.7) days and ( 29.5 ± 6.1 ) days,respectively ( t =2.374,P ＜ 0.01 ).The healing rates were 96.7％ (58/60) and 87.1％ (54/62),respectively(P ＜0.01 ).The average period in hospitalization were (20.1 ± 3.5 ) days and ( 36.5 ± 4.6 ) days,respectively ( t =2.564,P ＜ 0.01 ).Total expenses of hospitalization were(20 155.6 ± 153.8) yuan RMB and(41 465.5 ± 146.6) yuan RMB,respectively(t =2.873,P ＜0.01 ).All the differences were statistically significant.Conclusion The VSD method is effective for the treatment of severe diabetic foot gangrene(DFG).It is able to reduce the time of wound healing significantly,increase the healing rate,shorten the hospitalization period and cut the general expenses during hospitalization.It' s an effective method for the treatment of DFG.

Objective To compare the clinical efficacy and safety of pegylated interferon α-2a (Peg IFN α-2a) or adefovir dipivoxil(ADV) monotherapy and their combination therapy in HBeAg positive chronic hepatitis B (CHB) patients. Methods An open randomized controlled multicenter clinical trial was performed. One hundred and twenty cases with CHB were divided into 3 groups: Peg IFN α-2a monotherapy (group A), ADV monotherapy (group B) and Peg IFN α-2a plus ADV combination therapy (group C). The virological response (VR), serological response (HBeAg, HBsAg clearance and seroconversion), biochemical response (BR) and sustained response (SR) were tested at week 24 and 48 of therapy and week 48 of follow-up after end of treatment (EOT) for'evaluation of therapeutic effects, safety and drug resistance. The efficacy was compared using X2 test. Results At week 48 of treatment, the VR (HBV DNA ≤500 copy/mL) rates were 36. 8%(14/38), 37. 5%(15/40) and 62. 9% (22/35), respectively in groups A, B and C; that in group C was higher than those in groups A and B (X2 = 4. 933, 4. 801, respectively; both P < 0. 05); HBeAg seroconversion rates in three groups were 44. 7% (17/38), 17. 5% (7/40) and 51. 4% (18/35), respectively. At week 48 of follow-up,SR rates in three groups were 34. 2%(13/38), 15. 0%(6/40) and 48. 6% (17/35), respectively; those in groups C and A were higher than that in group B (X2 = 9. 894,P<0. 01;X2 =3. 903, P<0. 05, respectively). Conclusions VRs at week 24 and 48 of Peg IFN α-2a plus ADV combination therapy are better than Peg IFN α-2a or ADV monotherapy. SRs at week 48 of follow-up after Peg IFN α-2a monotherapy and combination therapy are both better than ADV monotherapy.

Objective To explore the risk factors for lower extremity amputation in patients with diabetic foot.Methods The clinical data of 1 771 patients with diabetic foot at the Air Force General Hospital of PLA from November 2001 to April 2015 were retrospectively analyzed.The patients were divided into the non-amputation and amputation groups.Within the amputation group , subjects were further divided into the minor and major amputation subgroups.Binary logistic regression analyses were used to assess the association between risk factors and lower extremity amputation.Results Among 1 771 patients with diabetic foot , 323 of them ( 18.24%) were in the amputation group ( major amputation: 41; minor amputation:282 ) and 1 448 ( 81.76%) in the non-amputation group.Compared with non-amputation patients, those in the amputation group had a longer hospital stay and higher estimated glomerular filtration rate(eGFR)levels.Fasting plasma glucose (FPG), glycosylated hemoglobin (HbA1c), C-reaction protein (CRP), ESR, ferritin, fibrinogen and WBC levels of the amputation group were higher , while hemoglobin albumin, transferrin, TC, TG, HDL-C and LDL-C were lower than those of the non-amputation group (all P<0.05 ).The proportion of hypertension ( 52.48% vs 59.98%) , peripheral vascular disease ( PAD ) (68.11% vs 25.04%), and coronary heart disease (21.33% vs 28.71%) were different between the amputation and non-amputation groups (all P<0.05).Multivariable logistic regression analyses showed that Wagner′s grade , PAD and CRP were the independent risk factors associated with lower extremity amputation in hospitalized patients with diabetic foot.Conclusion Wagner′s grade, ischemia of lower limbs and infection are closely associated with amputation of diabetic foot patients.

Objective To investigate the effect of electroacupuncture on diaphragm function of chronic obstructive pulmonary disease (COPD) rats with muscular dystrophy, and to explore the regulatory mechanism. Methods Forty male rats were randomly divided into blank group, model group, electroacupuncture group, exercise group, electroacupuncture plus exercise group, 8 rats in each group. After successful establishment of COPD rat model with muscular dystrophy, the modeled rats in various intervention groups were given electroacupuncture and/or exercise treatment. After the last treatment, the changes of rat body mass were observed, the rat lung function was detected, and the mRNA expression levels of myosin heavy chains (MHC) of MHC-1, MHC-2 and diaphragmatic related signal proteins of Atrogin-1, muscle ring-finger protein-1(MuRF-1), MyoD were detected by real-time quantitative polymerase chain reaction (qPCR). Results (1) Compared with the blank group, inspiratory resistance (IR) and functional residual mass (FRC) in the model group were increased (P < 0.05) , and the dynamic lung compliance(Cydn) was decreased(P<0.05). Compared with the model group, IR and FRC in the intervention groups were decreased (P < 0.05), but the differences among the three intervention groups were insignificant(P>0.05). (2) Compared with the blank group, the mRNA expression levels of MHC-1, Atrogin-1, MuRF-1, MyoD in the model group were increased (P<0.05), and the mRNA expression level of MHC-2 was decreased (P < 0.05). Compared with the model group, the mRNA expression levels of MHC-1, Atrogin-1, MuRF-1, MyoD in the intervention groups were decreased (P < 0.05) , and the mRNA expression level of MHC-2 was increased(P<0.05). Compared with the exercise group, the mRNA expression levels of Atrogin-1, MuRF-1, MyoD in the electroacupuncture group were decreased (P<0.05), and the mRNA expression level of MHC-2 was increased (P<0.05) , but the above indexes in electroacupuncture plus exercise group showed no obvious changes(P>0.05). Conclusion Electroacupuncture can improve respiratory function of COPD rats with muscular dystrophy, and the possible mechanism is related with the increase of MHC-2 mRNA expression and with the decrease of Atrogin-1, MuRF-1, MyoD mRNA expression, which result into the regulation of ubiquitin proteasome pathway(UPP), reduction of myosin loss, and the relief of diaphragmatic atrophy.

Objective:To investigate the risk factors of bronchopulmonary dysplasia (BPD) in very low birth weight (VLBW) infants with gestational age ≤32 weeks within 28 days after birth and to establish and validate the nomogram model for BPD prediction.Methods:We retrospectively chose VLBW infants with gestational age ≤32 weeks who survived to postmenstrual age (PMA) 36 weeks and were admitted to the neonatal intensive care unit of Peking University Third Hospital from January 2016 to April 2020 as the training cohort. BPD was diagnosed in accordance with the 2018 criteria. The clinical data of these infants were collected, and the risk factors of BPD were analyzed by Chi-square test, Mann-Whitney U test, and multivariate logistic regression, and a nomogram model was established. The area under the curve (AUC) of the receiver operating characteristic (ROC) curve was used to assess the predictive performance. Decision curve analysis (DCA) was constructed for differentiation evaluation, and the calibration chart and Hosmer-Lemeshow goodness of fit test were used for the calibration evaluation. Bootstrap was used for internal validation. VLBW infants with gestational age ≤32 weeks survived to PMA 36 weeks and admitted to Hebei Chengde Maternal and Child Health Hospital from October 2017 to February 2022 were included as the validation cohort. ROC curve and calibration plot were conducted in the validation cohort for external validation. Results:Of the 467 premature infants included in the training cohort, 104 were in the BPD group; of the 101 patients in the external validation cohort, 16 were in the BPD group. Multivariate logistic regression analysis showed that low birth weight ( OR=0.03, 95% CI: 0.01-0.13), nosocomial pneumonia ( OR=2.40, 95% CI: 1.41-4.09), late-onset sepsis ( OR=2.18, 95% CI: 1.18-4.02), and prolonged duration of endotracheal intubation ( OR=1.61, 95% CI: 1.26-2.04) were risk factors for BPD in these groups of infants (all P<0.05). According to the multivariate logistic regression analysis results, a nomogram model for predicting BPD risk was established. The AUC of the training cohort was 0.827 (95% CI: 0.783-0.872), and the ideal cut-off value for predicted probability was 0.206, with a sensitivity of 0.788 (95% CI: 0.697-0.862) and specificity of 0.744 (95% CI: 0.696-0.788). The AUC of the validation cohort was 0.951 (95% CI:0.904-0.999). Taking the prediction probability of 0.206 as the high-risk threshold, the sensitivity and specificity corresponding to this value were 0.812 (95% CI: 0.537-0.950) and 0.882 (95% CI: 0.790-0.939). The Hosmer-Lemeshow goodness-of-fit test in the training and validation cohort showed a good fit ( P>0.05). DCA results showed a high net benefit of clinical intervention in very preterm infants when the threshold probability was 5%~80% for the training cohort. Conclusion:Low birth weight, nosocomial pneumonia, late-onset sepsis, and prolonged tracheal intubation duration are risk factors for BPD. The established nomogram model has a certain value in predicting the risk of BPD in VLBW less than 32 weeks.