Objective:To explore the clinical effect of applying above-knee medial free-style perforator propeller flap in repairing deep wounds in and around the knee joint.Methods:This study was a retrospective observational study. From December 2020 to October 2023, the Department of Burns and Cutaneous Surgery of the First Affiliated Hospital of Air Force Medical University admitted 13 patients who met the inclusion criteria and had deep burn wounds in and around the knee joints, including 9 males and 4 females, aged 16-70 years. After debridement, the sizes of skin and soft tissue defects ranged from 5.0 cm×4.0 cm to 9.0 cm×7.0 cm. A free-style perforator propeller flap was designed and harvested from the medial supragenicular region, using a perforator vessel as the pedicle. The size of the flap ranged from 6.0 cm×4.0 cm to 15.0 cm×7.0 cm. The larger paddle of the flap was used to repair the wound in and around the knee joint, while the smaller paddle assisted in closing the donor site wound. After surgery, the survival status of the flap, wound healing at the donor and recipient sites, and complications such as infection, effusion, and necrosis were observed. During the follow-up, the appearance, color, and texture of the flap as well as the wound healing, scar contracture, and knee joint mobility at the recipient site were observed, and the scar condition, sensory recovery, and complications at the donor site were recorded.Results:Postoperatively, all 13 patients achieved successful flap survival. In one case, infection occurred at the edge of the flap but healed after appropriate treatment including drainage and dressing changes, and the donor site wound healed well; the remaining 12 patients showed uneventful healing at both donor and recipient sites without complications. During follow-up of 5 to 24 months, all 13 patients exhibited natural appearance, normal skin color, soft texture, and good elasticity. The recipient site wounds healed well without scar contracture or deformity, with full range of motion in the knee joint. A mild linear scar remained at the donor site on the inner thigh, with normal sensory function and no numbness.Conclusions:The above-knee medial free-style perforator propeller flap demonstrates simple harvest with minimal trauma for repairing deep wounds in and around the knee joint, providing satisfactory aesthetic and functional outcomes at both donor and recipient sites.

Objective:To explore the value of ultrasound imaging characteristics combined with clinical indicators in assessing the prognosis of patients with pancreatic ductal adenocarcinoma (PDAC).Methods:A retrospective analysis was conducted for patients who underwent pancreatic contrast-enhanced ultrasound (CEUS) from September 2017 to October 2023 at Peking Union Medical College Hospital and were diagnosed with PDAC based on pathological findings. Various parameters were recorded, including CA19-9 levels, tumor size, location, morphologic features, echogenicity, presence of internal cystic components, dilatation of the main pancreatic duct, peripheral vascular invasion, CEUS characteristics, presence or absence of liver metastasis, and treatment methods. In April 2024, patient survival information was obtained through telephone follow-up or review of medical records. Based on the results of the cox regression model analysis, a nomogram model of the risk of death was developed. The receiver operating characteristic (ROC) curves were applied to evaluate the predictive efficacy of the model. The calibration curves were plotted to evaluate the accuracy of the model, and clinical decision curves were used to evaluate the clinical benefit of the model.Results:This study included a total of 207 patients with PDAC. As of April 2024, 71 patients were alive and 136 died, with a median survival time of 14 months (95% CI: 12 -17). Multivariate analysis confirmed that the elevated CA19-9 ( HR=1.689, 95% CI: 1.102-2.588), tumor size >4 cm ( HR=1.641, 95% CI: 1.159-2.322), taller-than-wide shapes ( HR=1.450, 95% CI: 1.019-2.065), incomplete hypo-enhancement ( HR=1.618, 95% CI: 1.100-2.380), and liver metastasis ( HR=1.687, 95% CI: 1.175-2.423) were independent risk factors for survival in patients with PDAC. A nomogram model was further constructed for 6-month, 12-month and 3-year survival of patients with PDAC. The areas under the ROC curve were 0.679, 0.705 and 0.815, respectively. The calibration curves suggested that the model was more accurate, and the clinical decision curves showed that the model had a better clinical benefit. Conclusion:The combined use of ultrasound imaging characteristics and clinical indicators could effectively predict the prognosis of PDAC patients. Specifically, tumor size >4 cm, taller-than-wide shapes, incomplete hypo-enhancement, elevated CA19-9, and the presence of liver metastasis are correlated with poorer survival outcomes. The nomogram model constructed on the basis of these factors can be used to assess the survival of patients with PDAC.

To explore the feasibility of using UAV-LiDAR for measuring the leaf area index (LAI) of crop canopies, we employed UAV-LiDAR to scan sugarcane canopies during the tillering and elongation stages, acquiring canopy point cloud data. Subsequently, features such as average row height, projected row area, point cloud density at different canopy layers, and the ratios between these parameters were extracted. Three feature selection methods-partial least squares regression (PLSR), XGBoost feature importance (XGBoost-FI), and random forest-recursive feature elimination (RF-RFE)-were adopted to evaluate and identify the optimal input variables for modeling. With these selected variables, LAI inversion models were developed based on random forest (RF) and adaptive boosting (AdaBoost) algorithms, and their performance was assessed. Among the extracted features, the projected row area S_p and the total row point count C_total exhibited strong correlations with LAI, with correlation coefficients of 0.73 and 0.72, respectively. The AdaBoost-based LAI inversion model, using the projected row area S_p, average height H_avg, mid-layer point cloud density C_m, and total row point count C_total as input variables, achieved the best performance, with a coefficient of determination (R_v²) of 0.713 and a root mean square error (RMSE_v) of 0.25 on the validation set. This study provides an effective method for high-throughput acquisition of LAI in field crops, offering valuable scientific support for sugarcane field management and breeding efforts.
Plant Leaves/growth & development* ; Saccharum/growth & development* ; Algorithms ; Unmanned Aerial Devices ; Remote Sensing Technology/methods* ; Crops, Agricultural/growth & development*

Objective:To investigate the autophagy level of CD8+T cells in rat model of chronic obstructive pulmonary disease(COPD)and correlation with its number,and to explore the role of autophagy in pathogenesis of COPD.Methods:Thirty-six 6-week-old male SD rats were divided into three groups,including normal control group,COPD group and COPD intervention group.COPD model was established by smoking,and intraperitoneal injection of 3-methyladenine(3-MA)was used for intervention.Lung function of rats was detected by small animal pulmonary function testing,and frequency of CD8+T cells,CD8+memory T cells,CD8+effector T cells in blood and lung of rats were detected by flow cytometry.CD8+T cells were sorted by immunomagnetic beads,and expressions of autophagy protein including LC3-Ⅱ/Ⅰ,Beclin-1 and p62 in CD8+T cells were detected by Western blot.The middle lobe of right lung was collected for histological observation.Results:Infiltration of inflammatory cells and the decline of lung function in COPD group were more obvious than those in normal group.Frequency of CD8+T cells,CD8+effector T cells and CD8+memory T cells in blood and lung of rats in COPD group were significantly higher than those in normal control group(all P<0.05).Level of autophagy protein,LC3-Ⅱ/Ⅰ and Beclin-1 of CD8+T cells in COPD group were significantly higher than that in normal control group,while level of p62 was lower than that in normal control group(P<0.01).CD8+T cells,CD8+effector T cells,CD8+memory T cells in COPD intervention group were significantly lower than those in COPD group(P<0.05).Correlation analysis showed that LC3-Ⅱ/Ⅰ expression level was positively correlated with frequency of CD8+T cells in blood(r=0.667,P<0.01).Expression level of Beclin-1 was positively correlated with frequency of CD8+T cells and CD8+effector T cells in blood(r=0.505,P=0.021;r=0.428,P=0.037).Expression of LC3-Ⅱ/Ⅰprotein was positively correlated with frequency of CD8+T cells and CD8+effector T cells in lung tissue(r=0.474,P=0.019;r=0.549,P=0.006).Expression of Beclin-1 was positively correlated with frequency of CD8+effector T cells in lung tissue(r=0.458,P=0.025).Conclusion:Level of CD8+T cell autophagy is correlated with its number.CD8+T cell autophagy may be involved in the chronic inflam-matory process of COPD,and 3-MA can inhibit COPD inflammation.

Objective:To explore the value of ultrasound imaging characteristics combined with clinical indicators in assessing the prognosis of patients with pancreatic ductal adenocarcinoma (PDAC).Methods:A retrospective analysis was conducted for patients who underwent pancreatic contrast-enhanced ultrasound (CEUS) from September 2017 to October 2023 at Peking Union Medical College Hospital and were diagnosed with PDAC based on pathological findings. Various parameters were recorded, including CA19-9 levels, tumor size, location, morphologic features, echogenicity, presence of internal cystic components, dilatation of the main pancreatic duct, peripheral vascular invasion, CEUS characteristics, presence or absence of liver metastasis, and treatment methods. In April 2024, patient survival information was obtained through telephone follow-up or review of medical records. Based on the results of the cox regression model analysis, a nomogram model of the risk of death was developed. The receiver operating characteristic (ROC) curves were applied to evaluate the predictive efficacy of the model. The calibration curves were plotted to evaluate the accuracy of the model, and clinical decision curves were used to evaluate the clinical benefit of the model.Results:This study included a total of 207 patients with PDAC. As of April 2024, 71 patients were alive and 136 died, with a median survival time of 14 months (95% CI: 12 -17). Multivariate analysis confirmed that the elevated CA19-9 ( HR=1.689, 95% CI: 1.102-2.588), tumor size >4 cm ( HR=1.641, 95% CI: 1.159-2.322), taller-than-wide shapes ( HR=1.450, 95% CI: 1.019-2.065), incomplete hypo-enhancement ( HR=1.618, 95% CI: 1.100-2.380), and liver metastasis ( HR=1.687, 95% CI: 1.175-2.423) were independent risk factors for survival in patients with PDAC. A nomogram model was further constructed for 6-month, 12-month and 3-year survival of patients with PDAC. The areas under the ROC curve were 0.679, 0.705 and 0.815, respectively. The calibration curves suggested that the model was more accurate, and the clinical decision curves showed that the model had a better clinical benefit. Conclusion:The combined use of ultrasound imaging characteristics and clinical indicators could effectively predict the prognosis of PDAC patients. Specifically, tumor size >4 cm, taller-than-wide shapes, incomplete hypo-enhancement, elevated CA19-9, and the presence of liver metastasis are correlated with poorer survival outcomes. The nomogram model constructed on the basis of these factors can be used to assess the survival of patients with PDAC.

Objective:To investigate the autophagy level of CD8+T cells in rat model of chronic obstructive pulmonary disease(COPD)and correlation with its number,and to explore the role of autophagy in pathogenesis of COPD.Methods:Thirty-six 6-week-old male SD rats were divided into three groups,including normal control group,COPD group and COPD intervention group.COPD model was established by smoking,and intraperitoneal injection of 3-methyladenine(3-MA)was used for intervention.Lung function of rats was detected by small animal pulmonary function testing,and frequency of CD8+T cells,CD8+memory T cells,CD8+effector T cells in blood and lung of rats were detected by flow cytometry.CD8+T cells were sorted by immunomagnetic beads,and expressions of autophagy protein including LC3-Ⅱ/Ⅰ,Beclin-1 and p62 in CD8+T cells were detected by Western blot.The middle lobe of right lung was collected for histological observation.Results:Infiltration of inflammatory cells and the decline of lung function in COPD group were more obvious than those in normal group.Frequency of CD8+T cells,CD8+effector T cells and CD8+memory T cells in blood and lung of rats in COPD group were significantly higher than those in normal control group(all P<0.05).Level of autophagy protein,LC3-Ⅱ/Ⅰ and Beclin-1 of CD8+T cells in COPD group were significantly higher than that in normal control group,while level of p62 was lower than that in normal control group(P<0.01).CD8+T cells,CD8+effector T cells,CD8+memory T cells in COPD intervention group were significantly lower than those in COPD group(P<0.05).Correlation analysis showed that LC3-Ⅱ/Ⅰ expression level was positively correlated with frequency of CD8+T cells in blood(r=0.667,P<0.01).Expression level of Beclin-1 was positively correlated with frequency of CD8+T cells and CD8+effector T cells in blood(r=0.505,P=0.021;r=0.428,P=0.037).Expression of LC3-Ⅱ/Ⅰprotein was positively correlated with frequency of CD8+T cells and CD8+effector T cells in lung tissue(r=0.474,P=0.019;r=0.549,P=0.006).Expression of Beclin-1 was positively correlated with frequency of CD8+effector T cells in lung tissue(r=0.458,P=0.025).Conclusion:Level of CD8+T cell autophagy is correlated with its number.CD8+T cell autophagy may be involved in the chronic inflam-matory process of COPD,and 3-MA can inhibit COPD inflammation.

Objective:To explore the clinical effect of applying above-knee medial free-style perforator propeller flap in repairing deep wounds in and around the knee joint.Methods:This study was a retrospective observational study. From December 2020 to October 2023, the Department of Burns and Cutaneous Surgery of the First Affiliated Hospital of Air Force Medical University admitted 13 patients who met the inclusion criteria and had deep burn wounds in and around the knee joints, including 9 males and 4 females, aged 16-70 years. After debridement, the sizes of skin and soft tissue defects ranged from 5.0 cm×4.0 cm to 9.0 cm×7.0 cm. A free-style perforator propeller flap was designed and harvested from the medial supragenicular region, using a perforator vessel as the pedicle. The size of the flap ranged from 6.0 cm×4.0 cm to 15.0 cm×7.0 cm. The larger paddle of the flap was used to repair the wound in and around the knee joint, while the smaller paddle assisted in closing the donor site wound. After surgery, the survival status of the flap, wound healing at the donor and recipient sites, and complications such as infection, effusion, and necrosis were observed. During the follow-up, the appearance, color, and texture of the flap as well as the wound healing, scar contracture, and knee joint mobility at the recipient site were observed, and the scar condition, sensory recovery, and complications at the donor site were recorded.Results:Postoperatively, all 13 patients achieved successful flap survival. In one case, infection occurred at the edge of the flap but healed after appropriate treatment including drainage and dressing changes, and the donor site wound healed well; the remaining 12 patients showed uneventful healing at both donor and recipient sites without complications. During follow-up of 5 to 24 months, all 13 patients exhibited natural appearance, normal skin color, soft texture, and good elasticity. The recipient site wounds healed well without scar contracture or deformity, with full range of motion in the knee joint. A mild linear scar remained at the donor site on the inner thigh, with normal sensory function and no numbness.Conclusions:The above-knee medial free-style perforator propeller flap demonstrates simple harvest with minimal trauma for repairing deep wounds in and around the knee joint, providing satisfactory aesthetic and functional outcomes at both donor and recipient sites.

OBJECTIVE To analyze the metabolites of Zhideke granules and speculate its metabolic pathway in rats in vivo. METHODS Male SD rats were randomly divided into blank group and administration group （Zhideke granules， 9.45 g/kg）； they were given ultrapure water or relevant medicine， twice a day， every 6-8 h， for 3 consecutive days. Serum， urine and feces samples of rats were collected， and their metabolites were identified by UPLC-Q-Exactive-MS technique after intragastric administration of Zhideke granules； their metabolic pathways were speculated. RESULTS After intragastric administration of Zhideke granules， 16 prototype components （i.g. irisflorentin， baicalin， chlorogenic acid） and 11 metabolites （i.g. hydration products of kaempferol or luteolin， methylation products of chlorogenic acid， and hydroxylation products of baicalin） were identified in serum， urine and feces of rats. Among them， 8 prototype components and 4 metabolites were identified in serum samples； 10 prototype components and 7 metabolites were identified in urine samples； 8 prototype components and 5 metabolites were identified in the fecal samples. CONCLUSIONS The metabolites of Zhideke granules in rats mainly include baicalin， irisflorentin，chlorogenic acid， and the main metabolic pathways included methylation， hydroxylation， glucuronidation.

OBJECTIVE To provide reference for basic analysis of the pharmacodynamic substance in Stahlianthus involucratus. METHODS Overall 24 SD male rats were randomly divided into blank group （purified water）， and administration group （ethanol extract of S. involucratus， 15.75 g/kg， calculated by crude drug）， with 12 rats in each group. They were given drug liquid/purified water intragastrically， twice a day， every 6-8 h， for consecutive 3 days. After medication， the blood， urine and fecal samples were collected from two groups of rats. UPLC-Q-Exactive-MS technology was used to identify the chemical constituents in the ethanol extract of S. involucratus， and metabolites in the blood， urine and fecal of rats after intragastrical administration of the ethanol extract of S. involucratus. Multivariate statistical analysis was employed to screen various serum metabolites. Metabolic pathways were analyzed by MetaboAnalyst 5.0 platform. RESULTS A total of 38 chemical constituents were identified from the ethanol extract of S. involucratus， including fourteen prototype components and three metabolites identified from 5 urine samples， nine prototype components identified from fecal samples， and ten prototype components and one metabolite identified from serum samples. A total of 71 differential metabolites were screened from two groups of rat serum samples， of which 44 differential metabolites， such as ferulic acid， glycyrrhizin， were up-regulated and 27 differential metabolites， such as arachidonic acid， phenylacetylglutamine， were down-regulated. The 71 differential metabolites were mainly enriched in 11 metabolic pathways， including phenylalanine metabolism， linoleic acid metabolism， arachidonic acid metabolism， and tryptophan metabolism. CONCLUSIONS Ferulic acid， liquiritigenin， isofraxidin and formononetin may be the material basis that directly exert pharmacological effects of S. involucratus. S. involucratus may exert anti-inflammatory effects by affecting metabolic pathways， including arachidonic acid metabolism and tryptophan metabolism.