Sampling is the first stage of the DNA Typing in forensic science,and some studies found that the sampling technology affected the outcomes of"Contact DNA"testing.Since swabs are the most commonly used collection instrument for"Contact DNA",the researchers in forensic science field should pay more attention to study the collection efficiency of swabs.However,currently the majority of relevant research is focused on downstream testing processes,such as typing and amplification;the corresponding work on sampling performance by swabs is quite limited.Furthermore,the absence of an internationally recognized standard procedure makes it impossible to directly compare the collection results among laboratories.In this paper,a review on the use of swabs in the forensic science field is presented.It analyzes the collection efficiency,advantages and disadvantages of different swabs,and investigates the need and feasibility of developing a standardized method to evaluate the swab collection efficiency,for improving the sampling performance of swabs and ultimately increasing the detection rate of"Contact DNA"in forensic science.

Objective:To investigate the prevalence of abdominal aortic aneurysm (AAA) and analyze its risk factors among male residents in nursing homes in Shuangliu district, Chengdu.Methods:A cross-sectional survey was conducted from 2014 to 2023 among male permanent residents aged 65 years or older from 24 nursing homes in Shuangliu district, Chengdu. The prevalence of AAA was calculated. Univariate analysis and multivariate logistic regression analysis were used to identify risk factors for AAA.Results:Among 3 092 elderly males screened, 98 cases of AAA were detected, with a prevalence rate of 3.17%. The mean age of AAA patients was (73.9±6.9)years, with height of (157.79±5.87)cm and weight of (57.90±9.45)kg. Univariate analysis showed that hypertension, systolic blood pressure, cardiovascular disease, cerebrovascular disease, smoking, and alcohol consumption were significantly associated with AAA prevalence (all P<0.05). Multivariate logistic regression analysis identified cerebrovascular disease ( OR=7.201), cardiovascular disease ( OR=12.412), smoking ( OR=2.887), and alcohol consumption ( OR=1.675) as independent risk factors for AAA in this population (all P<0.05). Conclusions:The prevalence of AAA among male nursing home residents in Shuangliu district, Chengdu is 3.17%. The main risk factors include alcohol consumption, cardiovascular disease, cerebrovascular disease, and smoking.

Sampling is the first stage of the DNA Typing in forensic science,and some studies found that the sampling technology affected the outcomes of"Contact DNA"testing.Since swabs are the most commonly used collection instrument for"Contact DNA",the researchers in forensic science field should pay more attention to study the collection efficiency of swabs.However,currently the majority of relevant research is focused on downstream testing processes,such as typing and amplification;the corresponding work on sampling performance by swabs is quite limited.Furthermore,the absence of an internationally recognized standard procedure makes it impossible to directly compare the collection results among laboratories.In this paper,a review on the use of swabs in the forensic science field is presented.It analyzes the collection efficiency,advantages and disadvantages of different swabs,and investigates the need and feasibility of developing a standardized method to evaluate the swab collection efficiency,for improving the sampling performance of swabs and ultimately increasing the detection rate of"Contact DNA"in forensic science.

Objective:To investigate the prevalence of abdominal aortic aneurysm (AAA) and analyze its risk factors among male residents in nursing homes in Shuangliu district, Chengdu.Methods:A cross-sectional survey was conducted from 2014 to 2023 among male permanent residents aged 65 years or older from 24 nursing homes in Shuangliu district, Chengdu. The prevalence of AAA was calculated. Univariate analysis and multivariate logistic regression analysis were used to identify risk factors for AAA.Results:Among 3 092 elderly males screened, 98 cases of AAA were detected, with a prevalence rate of 3.17%. The mean age of AAA patients was (73.9±6.9)years, with height of (157.79±5.87)cm and weight of (57.90±9.45)kg. Univariate analysis showed that hypertension, systolic blood pressure, cardiovascular disease, cerebrovascular disease, smoking, and alcohol consumption were significantly associated with AAA prevalence (all P<0.05). Multivariate logistic regression analysis identified cerebrovascular disease ( OR=7.201), cardiovascular disease ( OR=12.412), smoking ( OR=2.887), and alcohol consumption ( OR=1.675) as independent risk factors for AAA in this population (all P<0.05). Conclusions:The prevalence of AAA among male nursing home residents in Shuangliu district, Chengdu is 3.17%. The main risk factors include alcohol consumption, cardiovascular disease, cerebrovascular disease, and smoking.

Objective:To explore the predictors and reasons for restenosis in patients with Takayasu′s arteritis(TA) involved renal artery after plain old balloon angioplasty(POBA).Methods:The clinical data of 47 TA patients (47) with renal artery admitted to Xuanwu Hospital, Capital Medical University from January 2014 to December 2020 were analyzed, including 12 man and 35 female. The age ranged from 21 to 43 years old, with an average of (28.52±10.78) years old. All patient were diagnosed as TA and underwent POBA. The patients were divided into restenosis group ( n=18) and non-restenosis group ( n=29). The patients were followed up at 1, 3, and 6 months after surgery, and after 6 months, the patients were followed up every 6 months. All patients were followed up from 36 to 108 months.The basic clinical data of the two groups were compared, and the length of stent and residual stenosis were also compared. Measurement data were expressed as ( ± s), and t-test was used for comparison between groups. Counting data were expressed as the number of cases and percentage, and comparison between groups was analyzed using the chi-square test. Multivariate Logistic regression model was used to analyze the independent risk factors of restenosis after balloon dilation, and the OR value and 95% confidence interval were calculated. Logistic regression model was used to analyze the independent risk factors for restenosis after balloon dilation. Results:All patients received POBA and operation was successfully. Restenosis was found in 18 patients, and 29 patients remained normal during the follow-up. The primary patency rate was 61.7%. Multivariate Logistic regression analysis showed that HDL-C and lesion length were the influencing factors of restenosis after POBA in TA of renal artery. The serum HDL-C level was significantly lower and the lesion was significantly longer in restenosis group than in non-restenosis group ( P<0.05). The proportion of residual stenosis>20% was higher in restenosis group than in non-restenosis group ( P>0.05). Conclusion:Serum HDL-C level, lesion length may be may be independent influencing factors of restenosis after plain old balloon angioplasty in TA of the renal artery restenosis.

Objective:To explore the therapeutic effect of interventional treatment on Takayasu arteritis involved renal artery.Methods:A retrospective analysis was conducted on the clinical data of 26 patients (28 blood vessels) with Takayasu arteritis involved renal artery admitted to the Xuanwu Hospital, Capital University of Medical Sciences from January 2012 to July 2023. Balloon dilation or stent implantation were performed, and the t vascular patency rate, blood pressure changes, surgical effects, and complications were followed up and observed.Results:All patients underwent balloon dilation or stent implantation, and the surgery was successful, including 23 cases of balloon dilation (25 blood vessels) and 3 cases of stent implantation (3 blood vessels). During the follow-up period of 12-102 months, one case died of renal failure at 57 months post surgery (unilateral renal artery balloon dilation case), and one case was lost in the first year (unilateral renal artery balloon dilation case). The patency rates of balloon dilated blood vessels at 1 year, 3 years, and 5 years were 23/24(95.83%), 22/24(91.67%), and 20/23(86.96%), respectively. Patients with stent implantation had 2 diseased blood vessels unobstructed at 1 year of follow-up and 1 diseased blood vessel unobstructed at 3 years of follow-up. Some patients showed improvement in clinical symptoms, including 3 cases (3/26, 11.54%) of cured hypertension symptoms, 19 cases (19/26, 73.08%) of improved symptoms, and 4 cases (4/26, 15.38%) of ineffective symptoms. The systolic blood pressure decreased from preoperative (169.29±10.76)mmHg to (150.31±14.62)mmHg, with a statistically significant difference ( P<0.05). There was no statistically significant difference in blood creatinine levels between preoperative (78.42±21.38)μmol/L and postoperative (77.83±21.14)μmol/L ( P>0.05). Conclusions:Endovascular angioplasty is safe, feasible, and has a definite therapeutic effect on patients with Takayasu′s arteritis involved renal artery.

BACKGROUND: Knee osteoarthritis (KOA) is a prevalent chronic joint disease caused by various factors. Mesenchymal stem cells (MSCs) therapy is an increasingly promising therapeutic option for osteoarthritis. However, the chronic inflammation of knee joint can severely impede the therapeutic effects of transplanted cells. Gelatin microspheres (GMs) are degradable biomaterial that have various porosities for cell adhesion and cell–cell interaction. Excellent elasticity and deformability of GMs make it an excellent injectable vehicle for cell delivery. METHODS: We created Wharton’s jelly derived mesenchymal stem cells (WJMSCs)-GMs complexes and assessed the effects of GMs on cell activity, proliferation and chondrogenesis. Then, WJMSCs loaded in GMs were transplanted in the joint of osteoarthritis mice. After four weeks, joint tissue was collected for histological analysis. Overexpressing-luciferase WJMSCs were performed to explore cell retention in mice. RESULTS: In vitro experiments demonstrated that WJMSCs loaded with GMs maintained cell viability and proliferative potential. Moreover, GMs enhanced the chondrogenesis differentiation of WJMSCs while alleviated cell hypertrophy. In KOA mice model, transplantation of WJMSCs-GMs complexes promoted cartilage regeneration and cartilage matrix formation, contributing to the treatment of KOA. Compared with other groups, in WJMSCs+GMs group, there were fewer cartilage defects and with a more integrated tibia structure. Tracking results of stable-overexpressing luciferase WJMSCs demonstrated that GMs significantly extended the retention time of WJMSCs in knee joint cavity. CONCLUSION Our results indicated that GMs facilitate WJMSCs mediated knee osteoarthritis healing in mice by promoting cartilage regeneration and prolonging cell retention. It might potentially provide an optimal strategy for the biomaterial-stem cell based therapy for knee osteoarthritis.

Objective: To investigate the current situation of obesity and related metabolic abnormalities among preschool children, so as to provide theoretical support for future intervention. Methods: A cohort of 3 952 children, born in Tianjin and enrolled in the kindergarten from September 2017 to October 2018, were selected to conduct a baseline survey and a three-year follow-up (questionnaire survey, physical examination and laboratory testing). At the same time, a two-way cohort study was conducted to retrospectively collect maternal prenatal examination, delivery and regular physical examination information of children from birth to preschool age from Tianjin Maternal and Child Health Information System. Results: A total of 3 935, 3 654 and 2 739 children completed the follow up in the primary, middle and senior classes of kindergarten respectively. The height and weight of pre-school children increased with age, while the percentage of body fat decreased with age ( β-trend =-0.74, P <0.01). During three-year follow up, height, weight and body mass index of boys were higher than girls (P<0.05), while the percentage of body fat was lower than girls (primary class: 17.5%,18.5%; middle class: 16.4%,17.2%; senior class: 16.1%,17.1%, P <0.05). The detection rate of overweight (including obesity) and obesity increased with age( χ 2 trend were 15.51,38.72, P <0.05). The total detection rate of obesity increased from 5.4% at the baseline level to 9.6%. Laboratory test results showed that the detection rates of fasting blood glucose of boys were higher than that of girls in primary class, but blood lipid abnormalities were in the opposite (glucose: 7.7%, 4.8 %; lipid: 23.8% , 27.7%)( χ 2=12.01, 6.63, P <0.05). Conclusion The study has established a large growth cohort starting from the early embryonic stage, which will help to establish the strategies to promote children s health and prevent obesity and chronic diseases from multidimensional perspectives.

Objective To investigate the feasibility and effect of simple support bracket combined with one stitch suture in terminal ileostomy of two stomas during anus-preserving radical resection in low rectal cancer patients. Methods Retrospectively analysis was performed for rectal cancer patients with high risk factors for postoperative anastomotic leakage, who admitted to the Department of General Surgery our hospital from December 2019 to May 2021. The patients underwent laparoscopic-assisted low rectal cancer radical resection and terminal ileostomy. There were two groups including 35 patients in the group of simple bracket combined with one stitch suture, and 35 patients in the group of conventional suture. Preoperative and postoperative clinical data were analyzed. Results General data of two groups were similar. No difference statistical significantly in the rate of postoperative stoma‐related complications between the two groups ((P>0.05). All patients were without any severe complications. All stomas were successfully closed. The time of first-stage ileostomy (13.77±2.02) min vs. (22.66±3.64) min (P<0.001), second-stage stoma closure time (88.14±28.03) min vs. (103.29±30.96) min (P=0.04), and postoperative total time in hospital (14.54±2.32) d vs. (17.34±4.57) d (P=0.002) were shorter in simple bracket combined with one stitch suture group; both total cost in the hospital of first-stage operation (42 057.98±4 938.69) yuan vs. (44 728.46±5 223.62) yuan (P=0.03), and second-stage stoma closure blood loss (17.94±9.83) mL vs. (25.86±8.24) mL (P=0.001) lower compared with that in conventional suture group. Conclusions Simple support bracket combined with one stitch suture ileostomy did not increase postoperative stoma-related complications compared with conventional suture. However, it decreased the time for both first-stage ileostomy and second-stage stoma closure, and total cost in hospital. Therefore, it could be used for prophylactic ileostomy in low rectal cancer.

Objective: To explore the relationship between prepregnancy body mass index, weight gain during pregnancy with preschool obesity and body composition in offspring, so as to provide evidence for gestational weight gain and childhood obesity prevention. Methods: A total of 1 333 preschool children were recruited from 3 kindergartens in Tianjin from September to December 2020. Structured questionnaire was used to collect children s lifestyle information. Height, weight and body fat mass of children were assessed, and body fat percentage (FM%), fat mass index (FMI) and non fat mass index (FFMI) were calculated. Maternal medical records were collected and the mothers were grouped according to their prepregnancy weight status and weight gain during pregnancy. χ 2 test, t test, linear regression model and Logistic regression were used to analyze the differences of obesity and body composition among different groups. Results: The prevalence of overweight and obesity in preschoolers was 12.7% and 7.7%. After adjusting maternal age and delivery, gestational age, gender, age and lifestyle of children, the correlation between maternal pre pregnancy BMI,gestational weight gain with obesity and body composition indexes of children in preschool age was statistically significant ( P <0.05). For mothers with normal weight before pregnancy, excessive weight gain during pregnancy increased risk of high FM% and high FMI in offspring ( OR=1.81, 1.68, P <0.05). There was no significant correlation between maternal weight gain during pregnancy with offspring obesity and body composition among mothers with prepregnant overweight or obesity. Conclusion Maternal weight status before pregnancy and weight gain during pregnancy are correlated with obesity and body composition in the preschool age of offspring. It is suggested that mothers should maintain appropriate weight status before and during pregnancy.