68 results on '"Jun-Rong Zhang"'
Search Results
2. Comparison of the effect between traditional conservation and nasointestinal tube placement in adhesive small bowel obstruction: A matched case-control study
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Hui Wang, Jun-rong Zhang, Peng-sheng Tu, Wen-xuan Chen, Shuai Chen, Qing-feng Chen, Zong-qi Weng, Xin-chang Shang-guan, Bing-qiang Lin, and Xian-qiang Chen
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Adhesive small bowel obstruction ,Nasointestinal tube ,Traditional conservation treatment ,Dynamic monitoring ,Peripheral-blood test ,Surgery ,RD1-811 - Abstract
Adhesive small bowel obstruction (ASBO) causes a major burden in emergency medicine. Owing to in situ decompression, nasointestinal tube (NIT) placement has been increasingly used in clinical practice compared with traditional conservation (TC); however, the indications remain controversial. This study was designed to explore the indications for each treatment in ASBOs and then suggest the optimal strategy.After propensity score matching, 128 pairs were included (the NIT and TC groups). The occurrence of severe adverse events (SAEs), peri-treatment clinical parameters, and radiological features were compared between the successful and failed treatment groups.According to different stages of the entire treatment, the independent risk factors for adverse effects for ASBO were analysed in phase I and phase II. In phase I, normal red blood cells (RBC) levels (p = 0.011) and a balanced sodium ion level (p = 0.016) positively affected the outcomes of TC treatment. In phase II, for the TC group, the successful treatment rate reached 79.5% for patients with ASBOs whose normal RBC levels (p = 0.006) or decreasing white blood cells (WBC) levels (p = 0.014) after treatment. For the NIT group, the treatment success rate was 68.1% for patients whose electrolyte imbalance could be reversed or whose neutrophil count/lymphocyte ratio (NLR) levels was lower than 4.3 (p = 0.018).TC treatment is highly recommended for patients with normal RBC counts and sodium levels pretreatment. After dynamic monitoring of the treatment process, for both the TC and NIT groups, once ASBOs had elevated inflammatory biomarkers or irreversible electrolyte disturbances, surgical interference was preferred.
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- 2024
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3. Who would avoid severe adverse events from nasointestinal tube in small bowel obstruction? A matched case–control study
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Hui Wang, Jun-rong Zhang, Shuai Chen, Ping Hou, Qing-feng Chen, Zong-qi Weng, Xin-chang Shang-guan, Bing-qiang Lin, and Xian-qiang Chen
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Nasointestinal tube ,Small bowel obstruction ,Indication ,Severe adverse events ,Risk score system ,Diseases of the digestive system. Gastroenterology ,RC799-869 - Abstract
Abstract Background Nasointestinal tubes (NITs) have been increasingly used in patients with small bowel obstruction (SBO); However, severe adverse events (SAEs) of NITs might threaten the lives of patients. The indications of NITs need to be identified. This study was designed to explore the indications for the insertion of NITs in patients with SBO and to suggest the optimal strategies for individuals based on the outcomes of SAEs. Methods After propensity score matching, 68 pairs were included (Success group and failure group). The occurrence of SAEs and the clinical parameters were compared between the SAE group and the non-SAE group. Independent risk factors were evaluated among the subgroups. A novel scoring system was established to detect the subgroups that would benefit from NITs insertion. Results Successful implementation of NITs could avoid hypochloremia (p = 0.010), SAEs (p = 0.001), pneumonia (p = 0.006). SAEs occurred in 13 of 136 (9.6%) patients who accepted NITs insertion treatment. Risk factors for SAEs included tumors (p = 0.002), reduced BMI (p = 0.048), reduced hemoglobin (p = 0.001), abnormal activated partial thromboplastin time (p = 0.015) and elevated white blood cells (p = 0.002). A novel risk scoring system consists of hemoglobin before NITs insertion (95% CI 0.685, 0.893) and bowel obstruction symptoms relieved after NITs insertion (95% CI 0.575, 0.900) had the highest area under curve for predicting the occurrence of SAEs. We divided the risk score system into 3 grades, with the increasing grades, the rates of SAEs surged from 1.3% (1/74) to (6/11) 54.5%. Conclusion NITs successfully insertion could avoid SAEs occurrence in SBO conservative treatment. SBO patients without anemia and could be relieved after NITs insertion could be the potential benefit group for this therapy.
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- 2022
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4. Prediction and management of strangulated bowel obstruction: a multi-dimensional model analysis
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Wei-xuan Xu, Qi-hong Zhong, Yong Cai, Can-hong Zhan, Shuai Chen, Hui Wang, Lin Lin, Ying-qian Geng, Ping Hou, Xian-qiang Chen, and Jun-rong Zhang
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Strangulated bowel obstruction ,Radiological ,Multi-dimensional model ,Risk factors ,Indications ,Diseases of the digestive system. Gastroenterology ,RC799-869 - Abstract
Abstract Background Distinguishing strangulated bowel obstruction (StBO) from simple bowel obstruction (SiBO) still poses a challenge for emergency surgeons. We aimed to construct a predictive model that could distinctly discriminate StBO from SiBO based on the degree of bowel ischemia. Methods The patients diagnosed with intestinal obstruction were enrolled and divided into SiBO group and StBO group. Binary logistic regression was applied to identify independent risk factors, and then predictive models based on radiological and multi-dimensional models were constructed. Receiver operating characteristic (ROC) curves and the area under the curve (AUC) were calculated to assess the accuracy of the predicted models. Via stratification analysis, we validated the multi-dimensional model in the prediction of transmural necrosis both in the training set and validation set. Results Of the 281 patients with SBO, 45 (16.0%) were found to have StBO, while 236(84.0%) with SiBO. The AUC of the radiological model was 0.706 (95%CI, 0.617–0.795). In the multivariate analysis, seven risk factors including pain duration ≤ 3 days (OR = 3.775), rebound tenderness (OR = 5.201), low-to-absent bowel sounds (OR = 5.006), low levels of potassium (OR = 3.696) and sodium (OR = 3.753), high levels of BUN (OR = 4.349), high radiological score (OR = 11.264) were identified. The AUC of the multi-dimensional model was 0.857(95%CI, 0.793–0.920). In the stratification analysis, the proportion of patients with transmural necrosis was significantly greater in the high-risk group (24%) than in the medium-risk group (3%). No transmural necrosis was found in the low-risk group. The AUC of the validation set was 0.910 (95%CI, 0.843–0.976). None of patients in the low-risk and medium-risk score group suffered with StBO. However, all patients with bowel ischemia (12%) and necrosis (24%) were resorted into high-risk score group. Conclusion The novel multi-dimensional model offers a useful tool for predicting StBO. Clinical management could be performed according to the multivariate score.
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- 2022
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5. Pathogenic Leishmania spp. detected in lizards from Northwest China using molecular methods
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Jun-Rong Zhang, Xian-Guang Guo, Han Chen, Jin-Long Liu, Xiong Gong, Da-Li Chen, and Jian-Ping Chen
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Lizard ,Leishmania ,Pathogenic ,Mixed infection ,Haplotypes ,Northwest China ,Veterinary medicine ,SF600-1100 - Abstract
Abstract Background Leishmaniosis, a disease caused by pathogenic Leishmania parasites, remains an unresolved health problem in the New World and the Old World. It is well known that lizards can be infected by a subgenus of Leishmania parasites, i.e. Sauroleishmania, which is non-pathogenic to humans. However, evidence suggests that lizards may also harbor pathogenic Leishmania species including the undetermined Leishmania sp., discovered in our previous work. Leishmania DNA in lizard blood can be detected by using molecular methods, such as the polymerase chain reaction (PCR). Results Three hundred and sixteen lizards, representing 13 species of four genera, were captured for blood samples collection in Northwest China. Two reliable molecular markers (cytochrome b and heat shock protein 70 genes) were used for detection in the lizard blood samples, to confirm a widespread presence of pathogenic Leishmania parasites and the distribution pattern of Leishmania spp. in lizards from Northwest China. The PCR data indicated positive detection rate for Leishmania in all the tested lizards with an overall prevalence of 57.91% (183/316). Apart from lizard parasites like Leishmania tarentolae and Leishmania sp., several pathogenic Leishmania including L. turanica, L. tropica and L. donovani complex were identified by using phylogenetic analysis. Co-existence of different haplotypes was observed in most Leishmania DNA-positive lizards with an overall rate of 77.6% (142/183). Even mixed infections with different Leishmania species appeared to occur in the lizards with an overall rate of 37.7% (69/183). Conclusions Lizards can harbor pathogenic Leishmania spp. Co-existence of different haplotypes or even species of Leishmania indicates mixed infections in natural lizard host. Lizards may contribute to the spread of Leishmania parasites. The pathogenic Leishmania species detected in lizards from Northwest China may be of great eco-epidemiological importance.
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- 2019
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6. TNFRSF11B Suppresses Memory CD4+ T Cell Infiltration in the Colon Cancer Microenvironment: A Multiomics Integrative Analysis
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Jun-rong Zhang, Ping Hou, Xiao-jie Wang, Zong-qi Weng, Xin-chang Shang-guan, Hui Wang, Fang You, Bing-qiang Lin, Zheng-yuan Huang, and Xian-qiang Chen
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TNFRSF11B ,immune-related genes (IRGs) ,immunotherapy ,memory CD4+ T cell activation ,multiomics ,Immunologic diseases. Allergy ,RC581-607 - Abstract
BackgroundColorectal cancer is a lethal cancer worldwide. Due to the low tumor mutation burden and low proportion of tumor-infiltrating lymphocytes in the microenvironment of most patients, innovative immunotherapeutic approaches need to be identified.MethodsUsing the TCGA-COAD dataset (n = 514), we identified TNFRSF11B as a prognostic factor of colon cancer. An immunohistochemistry (IHC) dataset (n = 86), 290 single colorectal cancer cells (GSE81861), and 31 paired colon cancer transcriptional datasets were further applied to validate the function of TNFRSF11B, which was confirmed via fluorescence-activated cell sorting (FACS) analysis.ResultsA risk score system consisting of eight immune-related genes (IRGs) (FGFR2, ZC3HAV1L, TNFRSF11B, CD79A, IGHV3-11, IGHV3-21, IGKV2D-30, and IGKV6D-21) was constructed to predict the prognosis of colon cancer patients. Only TNFRSF11B was closely correlated with late-stage lymph node metastasis and worse survival outcomes (p = 0.010, p = 0.014, and p = 0.0061). In our IHC dataset, 72.09% (62/86) of the colon cancer patients had TNFRSF11B overexpression with significantly shorter overall survival times (p = 0.072). High TNFRSF11B expression typically had a later TNM stage (p = 0.067), a higher frequency of lymph node (p = 0.029) and lymphovascular (p = 0.007) invasion, and a higher incidence of pneumonia (p = 0.056) than their counterparts. The expression of six genes (KRT18, ARPC5L, ACTG1, ARPC2, EZR, and YWHAZ) related to pathogenic E. coli infection was simultaneously increased with TNFRSF11B overexpression via gene set enrichment analysis (GSEA). These genes are involved in the regulation of the actin cytoskeleton, shigellosis, bacterial invasion of epithelial cells, and Salmonella infection. Finally, only activated memory CD4+ T cells (p = 0.017) were significantly decreased in the high TNFRSF11B expression group via CIBERSORT comparison, which was confirmed by TIMER2.0 analysis of the TCGA-COAD dataset. We also performed FACS analysis to show that TNFRSF11B decreased the infiltration of central memory CD4+ T cells and effector memory CD4+ T cells in the colorectal cancer microenvironment (all p
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- 2021
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7. Do Self-Expanding Metal Stents as a Bridge to Surgery Benefit All Patients with Obstructive Left-Side Colorectal Cancers?
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Jun-rong Zhang, Ping Hou, Tian-ran Liao, Yong Wei, Xian-qiang Chen, and Bing-qiang Lin
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Diseases of the digestive system. Gastroenterology ,RC799-869 - Abstract
Background. Self-expanding metal stents (SEMS) have been increasingly used in patients with obstructive left-sided colorectal cancer (OLCC); however, stent-specific complications (e.g., perforations) might worsen the long-term survival outcome. Strict indication needed to be identified to confirm the benefit subgroups. This study was designed to explore the indication for emergency surgery (ES) and SEMS in patients with OLCC and to suggest optimal strategies for individuals. Methods. After propensity score matching, 36 pairs were included. Perioperative and long-term survival outcomes (3-year overall survival (OS) and 3-year disease-free survival (DFS)) were compared between the ES and SEMS groups. Independent risk factors were evaluated among subgroups. Stratification survival analysis was performed to identify subgroups that would benefit from SEMS placement or ES. Results. The perioperative outcomes were similar between the SEMS and ES groups. The 3-year OS was comparable between the SEMS (73.5%) and ES (60.0%) groups, and the 3-year DFS in the SEMS group (69.7%) was similar to that in the ES group (57.1%). The pT stage was an independent risk factor for 3-year DFS (p=0.014) and 3-year OS (p=0.010) in the SEMS group. The comorbidity status (p=0.049) independently affected 3-year DFS in the ES group. The 3-year OS rate was influenced by the cM stage (p=0.003). Patients with non-pT4 stages in the SEMS group showed obviously better 3-year OS (95.0%) than the other subgroups. The 3-year OS rate was 36.4% in the ES group when patients had a worse comorbidity status than their counterparts. Conclusion. SEMS might be preferred for patients of obstructive left-sided colorectal cancer in the “high-operative risk group” with existing comorbidities or those without locally advanced invasion, such as the non-pT4-stage status.
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- 2019
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8. Role of Cervical Cerclage and Vaginal Progesterone in the Treatment of Cervical Incompetence with/without Preterm Birth History
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Shao-Wei Wang, Lin-Lin Ma, Shuai Huang, Lin Liang, and Jun-Rong Zhang
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Cervical Cerclage ,Cervical Incompetence ,Preterm Delivery ,Vaginal Progesterone ,Medicine - Abstract
Background: Preterm birth (PTB) is the leading cause of perinatal morbidity and mortality worldwide, and its prevention is an important health-care priority. The cervical incompetence is a well-known risk factor for PTB and its incidence is about 0.1–2.0%, while there is no ideal optimum treatment recommended currently. The cervical incompetence causes about 15% of habitual abortion in 16–28 weeks. This study aimed to evaluate the effectiveness and safety of cervical cerclage and vaginal progesterone in the treatment of cervical incompetence with/without PTB history. Methods: We retrospectively observed the pregnancy outcome of 198 patients diagnosed with cervical incompetence from January 2010 to October 2015 in Beijing Hospital. Among the 198 women involved, women who had at least one PTB before 32 weeks (including abortion in the second trimester attributed to the cervical competence) were assigned to the PTB history cohort, and others were assigned to the non-PTB history cohort. All women underwent cerclage placement (cervical cerclage group) or administrated with vaginal progesterone (vaginal progesterone group) until delivery. The outcomes of interest were the differences in gestational age at delivery, the rate of premature delivery, neonatal outcome, complications, and route of delivery between the two treatment groups. Results: Among the 198 patients with cervical incompetence, 116 patients in PTB history cohort and 80 patients in non-PTB history cohort were included in the final analysis. In the PTB history cohort, cervical cerclage group had significantly longer cervical length at 2 weeks after the start of treatment (23.1 ± 4.6 mm vs. 12.4 ± 9.1 mm, P = 0.002), higher proportion of delivery ≥37 weeks' gestation (63.4% vs. 33.3%, P = 0.008), bigger median birth weight (2860 g vs. 2250 g, P = 0.031), and lower proportion of neonates whose 1-min Apgar score
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- 2016
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9. A 346 case analysis for laparoscopic spleen-preserving no.10 lymph node dissection for proximal gastric cancer: a single center study.
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Chang-Ming Huang, Jun-Rong Zhang, Chao-Hui Zheng, Ping Li, Jian-Wei Xie, Jia-Bin Wang, Jian-Xian Lin, Jun Lu, and Qi-Yue Chen
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Medicine ,Science - Abstract
This study was designed to formulate a model that efficiently predicts splenic hilar lymph node metastasis (SHLNM) in patients with proximal gastric cancer and to assess indications for laparoscopic spleen-preserving no.10 lymph node dissection (LSPNo.10LND) based on this model.Patients (N = 346) with proximal gastric cancer who underwent LSPNo.10LND from January 2010 to October 2013 were prospectively enrolled and retrospectively evaluated. Groups of patients with and without SHLNM were compared, and independent risk factors for SHLNM determined. An optimal predictive model of SHLNM in patients with proximal gastric cancer was well established.Of the 346 patients with proximal gastric cancer, only 35 (10.1%) were diagnosed with SHLNM. Depth of invasion, tumor location and metastases to No.7 and No.11 lymph nodes (LNs) were independent risk factors for SHLNM (p
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- 2014
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10. Design and performance characterization of the time-of-flight liquid neutron reflectometer at the China spallation neutron source
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Li-Ming Wang, Jianrong Zhou, Yanfeng Wang, Zhijia Sun, Fei Shen, Weiliang Cai, Guang Wang, Ming Tang, Rong Du, Lili Yan, Shenglan Chen, Haichuan Guo, Jun-Rong Zhang, and Tian-Jiao Liang
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General Chemical Engineering ,Instrumentation ,General Environmental Science - Published
- 2023
11. Comprehensively evaluate the short outcome of small bowel obstruction: A novel medical-economic score system
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Wei-Xuan Xu, Qi-Hong Zhong, Yong Cai, Can-Hong Zhan, Shuai Chen, Hui Wang, Peng-Sheng Tu, Wen-Xuan Chen, Xian-Qiang Chen, and Jun-Rong Zhang
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Gastroenterology ,General Medicine - Published
- 2023
12. Discovery and structure–activity relationship studies of novel tetrahydro-β-carboline derivatives as apoptosis initiators for treating bacterial infections1
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Shan-shan SU, Hong-wu LIU, Jun-rong ZHANG, Pu-ying QI, Yue DING, Zhang Ling, Lin-li YANG, Li-wei LIU, Xiang ZHOU, and Song YANG
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Food Animals ,Ecology ,Animal Science and Zoology ,Plant Science ,Agronomy and Crop Science ,Biochemistry ,Food Science - Published
- 2023
13. Discovery of novel rost‐4‐ene derivatives as potential plant activators for preventing phytopathogenic bacterial infection: Design, synthesis and biological studies
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Fang Wang, Hong‐Wu Liu, Ling Zhang, Shi‐Tao Liu, Jun‐Rong Zhang, Xiang Zhou, Pei‐Yi Wang, and Song Yang
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Oxadiazoles ,Xanthomonas ,Insect Science ,Oryza ,Bacterial Infections ,Microbial Sensitivity Tests ,General Medicine ,Agrochemicals ,Agronomy and Crop Science ,Anti-Bacterial Agents ,Plant Diseases - Abstract
Gradually aggravated disease caused by phytopathogenic bacteria severely restricts food security and crop yield, and few pesticides can relieve this severe situation. Thus, development and excavation of new agrochemicals with high bioactivity and novel action mechanism may be a feasible strategy to control intractable bacterial diseases. As a privileged molecular framework, steroid molecules exhibit diversiform bioactivities. Herein, a series of novel androst-4-ene derivatives were designed, synthesised and investigated for their antibacterial behaviour to excavate novel agrochemicals on the base of steroid molecules.Bioassay results indicated that target compounds displayed high bioactivities toward three destructive phytopathogenic bacteria, including Xanthomonas oryzae pv. oryzae (Xoo), Xanthomonas axonopodis pv. citri (Xac) and Pseudomonas syringae pv. actinidiae (Psa). Compound IIIGiven these profiles of target compounds, we highlight a new strategy for controlling intractable plant bacterial diseases by inducing plant resistance and targeting the bacterial cell membrane. © 2022 Society of Chemical Industry.
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- 2022
14. Rapid Conversion of Perhydropolysilazane into Thin Silica Coating at Low Temperature
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Wen-Yue Wang, Yu-Lin Zhang, Xiang Guo, Li-Ming Wang, Jun-Rong Zhang, Hui Yang, Guo-Jun Dong, Zong-Bo Zhang, and Cai-Hong Xu
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Polymers and Plastics ,General Chemical Engineering ,Organic Chemistry - Published
- 2023
15. Resistance‐driven innovations in the discovery of bactericides: novel triclosan derivatives decorating isopropanolamine moiety as promising anti‐biofilm agents against destructive plant bacterial diseases
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Jiao‐Jiao Zhang, Yu‐Mei Feng, Jun‐Rong Zhang, Wan‐Lin Xiao, Shuai‐Shuai Liu, Xiang Zhou, Heng Zhang, Pei‐Yi Wang, Li‐Wei Liu, and Song Yang
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Insect Science ,General Medicine ,Agronomy and Crop Science - Published
- 2023
16. Large area 3He tube array detector with modular design for multi-physics instrument at CSNS
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Lin Zhu, Jian-Rong Zhou, Yuan-Guang Xia, Liang Xiao, Hong Luo, Xiao-Juan Zhou, Wen-Qin Yang, Bei-Ju Guan, Xing-Fen Jiang, Yan-Feng Wang, Hong Xu, Hai-Yun Teng, Li-Xin Zeng, Jia-Jie Li, Lei Hu, Ke Zhou, Yong-Xiang Qiu, Pei-Xun Shen, Jun Xu, Li-Jiang Liao, Xiao-Zhuang Wang, Gui-An Yang, Huai-Chan Chen, Ju-Ping Xu, Zhi-Duo Li, Song-Lin Wang, Jian Zhuang, Yu-Bin Zhao, Jun-Rong Zhang, Wen Yin, Zhi-Jia Sun, and Yuan-Bo Chen
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Nuclear and High Energy Physics ,Nuclear Energy and Engineering - Published
- 2023
17. Design, Synthesis, and Biological Profiles of Novel 1,3,4-Oxadiazole-2-carbohydrazides with Molecular Diversity
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Jian-Jun Zhu, Pei-Yi Wang, Zhou-Qing Long, Shu-Zhen Xiang, Jun-Rong Zhang, Zhen-Xing Li, Yuan-Yuan Wu, Wu-Bin Shao, Xiang Zhou, Li-Wei Liu, and Song Yang
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Oxadiazoles ,Structure-Activity Relationship ,Hydrazines ,Xanthomonas ,Phytophthora infestans ,Microbial Sensitivity Tests ,General Chemistry ,General Agricultural and Biological Sciences ,Anti-Bacterial Agents ,Plant Diseases - Abstract
To unceasingly expand the molecular diversity of 1,3,4-oxadiazole-2-carbohydrazides, herein, small fragments (including -CH
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- 2022
18. Development of 3He-filled linear position-sensitive detector for neutron scattering instruments at CSNS
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Lin Zhu, Jian-rong Zhou, Xin-feng Jiang, Xiao-juan Zhou, Wen-qin Yang, Yuan-Guang Xia, Liang Xiao, Hong Luo, Bei-ju Guan, Yan-feng Wang, Hong Xu, Pei-xun Shen, Hai-yun Teng, Jia-jie Li, Gui-an Yang, Ju-ping Xu, Huai-can Chen, Song-lin Wang, Jian Zhuang, Jun-rong Zhang, Wen Yin, Zhi-jia Sun, Yuan-bo Chen, and Tianjiao Liang
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Nuclear and High Energy Physics ,Nuclear Energy and Engineering - Published
- 2022
19. Vibronic fine structure in the nitrogen 1s photoelectron spectra of molecules from Franck-Condon simulations: Azines
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Minrui Wei, Xiao Cheng, Lu Zhang, Jun-Rong Zhang, Sheng-Yu Wang, Guoyan Ge, Guangjun Tian, and Weijie Hua
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- 2022
20. A nomogram to predict the success rate of patients with small bowel obstruction relief by ileus tube
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Qing-Feng Chen, Bin-qiang Lin, Jun-rong Zhang, Chao-rong Xue, Jie Pan, Zheng-yuan Huang, and Xian-qiang Chen
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Purpose: This article investigated patient clinical data to establish a nomogram to predict the success rate of patients with small bowel obstruction relief by ileus tube.Methods: We identified 210 patients with small bowel obstruction treated with ileus tube (January 2014 to January 2020) from a prospectively collected database. Among them, 117 cases were successfully relieved (Successful group), and 93 cases failed (Failure group).Results: The Successful group had a higher age and body mass index, as well as a shorter time from obstruction to insertion than the failure group before insertion of the ileus tube. White blood cell, neutrophil, red blood cell distribution width and neutrophil-to-lymphocyte ratio were lower in the successful group after insertion of the ileus tube. In addition, white blood cell, neutrophil, and neutrophil-to-lymphocyte ratio decreased in the successful group after insertion. However, the result was the opposite in the Failure group. The success rate of paralytic ileus was the highest (79.4%). Patients with fecal stone ileus had the most rapid ventilation and defecation times. Multivariate analysis showed that the platelet-change, albumin after insertion, time from obstruction to insertion and obstruction factors were independent factors influencing the success rate of ileus tube insertion. In addition, we established nomograms to predict the success rate of patients with small bowel obstruction relief by ileus tube (C-index=0.753).Conclusion: This nomogram can effectively predict whether patients can successfully relieve obstruction by ileus tube, which provides convenience for clinical treatment.
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- 2022
21. A ceramic-GEM neutron detector with a wide neutron-flux measurement range for the beam monitoring at China spallation neutron source
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Lin Zhu, Jian-rong Zhou, Li-xin Zeng, Liang Xiao, Xiao-juan Zhou, Jin-hao Tan, Yuan-guang Xia, Hong Xu, Xing-fen Jiang, Wen-qin Yang, Yan-feng Wang, Gui-an Yang, Yu-guang Xie, Hai-yun Teng, Jia-jie Li, Yong-xiang Qiu, Pei-xun Shen, Song-lin Wang, Jian Zhuang, Yu-bin Zhao, Jun-rong Zhang, Zhi-jia Sun, and Yuan-bo Chen
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Instrumentation ,Mathematical Physics - Abstract
The increase of neutron flux in pulsed spallation neutron facilities imposes demands on the neutron detector for beam monitoring, including excellent neutron/gamma discrimination, wide dynamic neutron-flux measurement range, wavelength resolution, and long-term stability. In this paper, we developed a ceramic GEM-based (gas electron multiplier) neutron detector with an active area of 100 mm × 100 mm. It adopted a thinner conversion material and the stopping layer to lower the detection efficiency so as to extend the dynamic measurement range of the detector. The detection efficiency of this detector was investigated by the Monte Carlo (MC) tool FLUKA, showing that the low efficiency around 0.01% for 1 Åneutrons was reached by using a 0.1 μm natB4C converter appended with an aluminum film of 2 μm thickness. Its validation of the wavelength spectra measurement was verified by comparisons with that made with an LND monitor, and it could work at the condition of 7.1 × 109 n/s for 2.5 Åneutrons. In addition, it was demonstrated that this detector was able to measure the beam profile with a position resolution of better than 2.1 ± 0.1 mm. The results of simulations and experiments show that this ceramic-GEM neutron detector can meet the requirements of the direct measurement of high-flux beam, and it will be a new neutron detector for the beam monitoring at the China spallation neutron source (CSNS).
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- 2023
22. Application of neutron scattering in organic photovoltaic materials
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Li-Ming Wang, Lei Cao, Wen-Hai Ji, Rong Du, Ming Tang, Sheng-Lan Chen, Li-Li Yan, Yinguo Xiao, and Jun-Rong Zhang
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General Chemistry - Published
- 2023
23. A theoretical library of N1s core binding energies of polynitrogen molecules and ions in the gas phase
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Xinzhe Du, Sheng-Yu Wang, Minrui Wei, Jun-Rong Zhang, Guoyan Ge, and Weijie Hua
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General Physics and Astronomy ,Physical and Theoretical Chemistry - Abstract
Polynitrogen molecules and ions are important building blocks of high energy density compounds (HEDCs). High energy bonds formed at the N sites can be effectively probed by X-ray photoelectron spectroscopy (XPS) at the N K-edge. In this work, with the density functional theory and the ΔKohn-Sham scheme, we simulated the N1s ionic potentials (IPs) of 72 common polynitrogen molecules [tetrazoles, pentazole (N
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- 2022
24. Intrinsic Ultralow Lattice Thermal Conductivity in the Full-Heusler Compound Ba2AgSb
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Shao-Fei Wang, Zhi-Gang Zhang, Bao-Tian Wang, Jun-Rong Zhang, and Fang-Wei Wang
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General Physics and Astronomy - Published
- 2022
25. Who Would Benefit From Nasointestinal Tube in Small Bowel Obstruction?— A Matched Case-Control Study
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Bing-qiang Lin, Jun-rong Zhang, Zongqi Weng, Ping Hou, Qing-feng Chen, Hui Wang, Xin-chang Shang-guan, Shuai Chen, and Xian-qiang Chen
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Bowel obstruction ,medicine.medical_specialty ,business.industry ,parasitic diseases ,medicine ,Tube (fluid conveyance) ,medicine.disease ,business ,Surgery - Abstract
Background: Nasointestinal tubes (NITs) have been increasingly used in patients with small bowel obstruction (SBO); However, severe adverse events (SAEs) of NITs might threaten the lives of patients. The indications of NITs need to be identified. This study was designed to explore the indications for the insertion of NITs in patients with SBO and to suggest the optimal strategies for individuals based on the outcomes of SAEs.Methods: After propensity score matching, 68 pairs were included (Success group and failure group). The occurrence of SAEs and the clinical parameters were compared between the SAE group and the non-SAE group. Independent risk factors were evaluated among the subgroups. A novel scoring system was established to detect the subgroups that would benefit from NITs insertion.Results: Successful implementation of NITs could avoid hypochloremia (p=0.010), SAEs (p=0.001), pneumonia (p=0.006). SAEs occurred in 13 of 136 (9.6%) patients who accepted NITs insertion treatment. Risk factors for SAEs included tumors (p=0.002), reduced BMI (p=0.048), reduced hemoglobin (p=0.001), abnormal activated partial thromboplastin time (p=0.015) and elevated white blood cells (p=0.002). A novel risk scoring system consists of hemoglobin before NITs insertion (95% CI: 0.685, 0.893) and bowel obstruction symptoms relieved after NITs insertion (95% CI: 0.575, 0.900) had the highest area under curve (AUC) for predicting the occurrence of SAEs. We divided the risk score system into 3 grades, with the increasing grades, the rates of SAEs surged from 1.3% (1/74) to (6/11) 54.5%.Conclusion: NITs successfully insertion could avoid SAEs occurrence in SBO conservative treatment. SBO patients without anemia and could be relieved after NITs insertion could be the potential benefit group for this therapy.
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- 2022
26. Who would avoid severe adverse events from nasointestinal tube in small bowel obstruction? A matched case-control study
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Hui Wang, Jun-rong Zhang, Shuai Chen, Ping Hou, Qing-feng Chen, Zong-qi Weng, Xin-chang Shang-guan, Bing-qiang Lin, and Xian-qiang Chen
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Risk Factors ,Case-Control Studies ,Intestine, Small ,Gastroenterology ,Humans ,General Medicine ,Intestinal Obstruction - Abstract
BackgroundNasointestinal tubes (NITs) have been increasingly used in patients with small bowel obstruction (SBO); However, severe adverse events (SAEs) of NITs might threaten the lives of patients. The indications of NITs need to be identified. This study was designed to explore the indications for the insertion of NITs in patients with SBO and to suggest the optimal strategies for individuals based on the outcomes of SAEs.MethodsAfter propensity score matching, 68 pairs were included (Success group and failure group). The occurrence of SAEs and the clinical parameters were compared between the SAE group and the non-SAE group. Independent risk factors were evaluated among the subgroups. A novel scoring system was established to detect the subgroups that would benefit from NITs insertion.ResultsSuccessful implementation of NITs could avoid hypochloremia (p = 0.010), SAEs (p = 0.001), pneumonia (p = 0.006). SAEs occurred in 13 of 136 (9.6%) patients who accepted NITs insertion treatment. Risk factors for SAEs included tumors (p = 0.002), reduced BMI (p = 0.048), reduced hemoglobin (p = 0.001), abnormal activated partial thromboplastin time (p = 0.015) and elevated white blood cells (p = 0.002). A novel risk scoring system consists of hemoglobin before NITs insertion (95% CI 0.685, 0.893) and bowel obstruction symptoms relieved after NITs insertion (95% CI 0.575, 0.900) had the highest area under curve for predicting the occurrence of SAEs. We divided the risk score system into 3 grades, with the increasing grades, the rates of SAEs surged from 1.3% (1/74) to (6/11) 54.5%.ConclusionNITs successfully insertion could avoid SAEs occurrence in SBO conservative treatment. SBO patients without anemia and could be relieved after NITs insertion could be the potential benefit group for this therapy.
- Published
- 2021
27. Prediction and management of strangulated bowel obstruction: a multi-dimensional model analysis
- Author
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Wei-xuan Xu, Qi-hong Zhong, Yong Cai, Can-hong Zhan, Shuai Chen, Hui Wang, Lin Lin, Ying-qian Geng, Ping Hou, Xian-qiang Chen, and Jun-rong Zhang
- Subjects
Necrosis ,Ischemia ,Mesenteric Ischemia ,Intestine, Small ,Gastroenterology ,Humans ,General Medicine ,Intestinal Obstruction ,Retrospective Studies - Abstract
Background Distinguishing strangulated bowel obstruction (StBO) from simple bowel obstruction (SiBO) still poses a challenge for emergency surgeons. We aimed to construct a predictive model that could distinctly discriminate StBO from SiBO based on the degree of bowel ischemia. Methods The patients diagnosed with intestinal obstruction were enrolled and divided into SiBO group and StBO group. Binary logistic regression was applied to identify independent risk factors, and then predictive models based on radiological and multi-dimensional models were constructed. Receiver operating characteristic (ROC) curves and the area under the curve (AUC) were calculated to assess the accuracy of the predicted models. Via stratification analysis, we validated the multi-dimensional model in the prediction of transmural necrosis both in the training set and validation set. Results Of the 281 patients with SBO, 45 (16.0%) were found to have StBO, while 236(84.0%) with SiBO. The AUC of the radiological model was 0.706 (95%CI, 0.617–0.795). In the multivariate analysis, seven risk factors including pain duration ≤ 3 days (OR = 3.775), rebound tenderness (OR = 5.201), low-to-absent bowel sounds (OR = 5.006), low levels of potassium (OR = 3.696) and sodium (OR = 3.753), high levels of BUN (OR = 4.349), high radiological score (OR = 11.264) were identified. The AUC of the multi-dimensional model was 0.857(95%CI, 0.793–0.920). In the stratification analysis, the proportion of patients with transmural necrosis was significantly greater in the high-risk group (24%) than in the medium-risk group (3%). No transmural necrosis was found in the low-risk group. The AUC of the validation set was 0.910 (95%CI, 0.843–0.976). None of patients in the low-risk and medium-risk score group suffered with StBO. However, all patients with bowel ischemia (12%) and necrosis (24%) were resorted into high-risk score group. Conclusion The novel multi-dimensional model offers a useful tool for predicting StBO. Clinical management could be performed according to the multivariate score.
- Published
- 2021
28. Fabrication of Versatile Pyrazole Hydrazide Derivatives Bearing a 1,3,4-Oxadiazole Core as Multipurpose Agricultural Chemicals against Plant Fungal, Oomycete, and Bacterial Diseases
- Author
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Li-Wei Liu, Shi-Tao Liu, Jun-Rong Zhang, Jiao Xie, Jian-Jun Zhu, Zhou-Qing Long, Pei-Yi Wang, Wu-Bin Shao, Lin-Li Yang, and Song Yang
- Subjects
Xanthomonas ,Microbial Sensitivity Tests ,Pyrazole ,Rhizoctonia ,Rhizoctonia solani ,chemistry.chemical_compound ,Structure-Activity Relationship ,Xanthomonas oryzae ,Ascomycota ,Fusarium ,Fusarium oxysporum ,Humans ,Plant Diseases ,Oxadiazoles ,biology ,food and beverages ,General Chemistry ,Bacterial Infections ,biology.organism_classification ,Combinatorial chemistry ,Anti-Bacterial Agents ,Fungicide ,Molecular Docking Simulation ,Gibberella zeae ,chemistry ,Oomycetes ,Pyrazoles ,Fluopyram ,General Agricultural and Biological Sciences ,Antibacterial activity ,Agrochemicals - Abstract
Developing multipurpose agricultural chemicals is appealing in crop protection, thus eventually realizing the reduction and efficient usage of pesticides. Herein, an array of versatile pyrazole hydrazide derivatives bearing a 1,3,4-oxadiazole core were initially synthesized and biologically evaluated the antifungal, antioomycetes, and antibacterial activities. In addition, the pyrazole ring was replaced by the correlative pyrrole, thiazole, and indole scaffolds to extend the molecular diversity. The results showed that most of these hybrid compounds were empowered with multifunctional bioactivities, which are exemplified by compounds a1-a6, b1-b3, b7, b10, b13, and b18. For the antifungal activity, the minimal EC50 values could afford 0.47 (a2), 1.05 (a2), 0.65 (a1), and 1.32 μg/mL (b3) against the corresponding fungi Gibberella zeae (G. z.), Fusarium oxysporum, Botryosphaeria dothidea, and Rhizoctonia solani. In vivo pot experiments against corn scab (caused by G. z.) revealed that the compound a2 was effective with protective and curative activities of 90.2 and 86.3% at 200 μg/mL, which was comparable to those of fungicides boscalid and fluopyram. Further molecular docking study and enzymatic activity analysis (IC50 = 3.21 μM, a2) indicated that target compounds were promising succinate dehydrogenase inhibitors. Additionally, compounds b2 and a4 yielded superior anti-oomycete and antibacterial activities toward Phytophora infestins and Xanthomonas oryzae pv. oryzae with EC50 values of 2.92 and 8.43 μg/mL, respectively. In vivo trials against rice bacterial blight provided the control efficiency within 51.2-55.3% (a4) at 200 μg/mL, which were better than that of bismerthiazol. Given their multipurpose characteristics, these structures should be positively explored as agricultural chemicals.
- Published
- 2021
29. Electronic structures and spectral characteristics of the six C32 fullerene isomers
- Author
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Xiu-Neng Song, Yong Ma, Sheng-Yu Wang, Juan Lin, Jun-Rong Zhang, and Jing Hu
- Subjects
Fullerene ,Chemistry ,02 engineering and technology ,Electronic structure ,010402 general chemistry ,021001 nanoscience & nanotechnology ,01 natural sciences ,Atomic and Molecular Physics, and Optics ,XANES ,Spectral line ,0104 chemical sciences ,Analytical Chemistry ,Reflection (mathematics) ,X-ray photoelectron spectroscopy ,Physical chemistry ,Density functional theory ,0210 nano-technology ,Absorption (electromagnetic radiation) ,Instrumentation ,Spectroscopy - Abstract
In this paper, the six C32 isomers which were of crucial importance in the manufacture of new electronic components were identified by X-ray photoelectron spectroscopy (XPS) and near-edge X-ray absorption fine structure (NEXAFS). For the discernment, geometry optimizations of the six isomers have been carried out, and the C1s XPS and NEXAFS spectra have been simulated in the frame of density functional theory (DFT). XPS spectra, as accurately reflection of different chemical environments where a particular element was located, provided an effective way to identify the six isomers of C32. The NEXAFS spectra, which were commonly used in the electronic structure detection, captured information of unoccupied orbital and showed many recognizable characteristics. To further investigate the source of spectral features, the spectral components calculated from different types of carbon atoms in each C32 isomer also have been well explored and discussed.
- Published
- 2019
30. Accurate K-edge X-ray photoelectron and absorption spectra of g-C3N4 nanosheets by first-principles simulations and reinterpretations
- Author
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Weijie Hua, Bin Gao, Junfei Ding, Yong Ma, Sheng-Yu Wang, Erjun Kan, and Jun-Rong Zhang
- Subjects
X-ray absorption spectroscopy ,Materials science ,Absorption spectroscopy ,Analytical chemistry ,General Physics and Astronomy ,02 engineering and technology ,010402 general chemistry ,021001 nanoscience & nanotechnology ,01 natural sciences ,Spectral line ,0104 chemical sciences ,Vibronic coupling ,Ionic potential ,K-edge ,X-ray photoelectron spectroscopy ,Density functional theory ,Physical and Theoretical Chemistry ,0210 nano-technology - Abstract
We performed a density functional theory (DFT) study on X-ray photoelectron (XPS) and absorption (XAS) spectra of graphitic carbon nitride (g-C3N4) nanosheets at the N and C K-edges. A combined cluster-periodic approach was employed to calculate XPS spectra, in which the core ionic potential (IP) of the solid 2D material was computed by subtracting the work function (obtained with periodic conditions) from the gas phase IP (obtained with large cluster models). With amino-terminated supermolecules of different sizes, we obtained convergent spectra and provide new assignments for 5 nitrogen [1 sp2; 4 sp3 (bridging, tertiary, and primary/secondary amino nitrogens)] and 4 carbon (all bonded with three nitrogens) local structures. A good agreement with experiments was obtained, with the N1s (C1s) main peak position differing by 0.1-0.2 eV (0.5-0.8 eV). Our simulations show that N1s XPS of pure g-C3N4 contains only two major features at 398.6 and 401.2 eV, contributed from sp2-N and sp3-N, respectively. The chemical shifts of all sp3-N are so close (deviating by 0.3-0.6 eV) that terminal amino groups -NHx (x = 1, 2) will only be distinguished in high-resolution measurements. In C1s XPS, all carbons show similar (deviation < 0.2 eV) IPs, as determined by the same nearest neighbors. We further excluded the effect of shake-up satellites that may change our XPS interpretations by equivalent core hole time-dependent DFT (ECH-TDDFT) simulations. The effect of vibronic coupling is small (redistribution is only 0.1-0.3 eV to the higher-energy region) in the N1s edge as estimated from the asymmetric main peak shape, and negligible in the C1s edge. Quicker size convergence was found in XAS than XPS. In N1s XAS, we identified a weak π* spectral feature at 400-401 eV for both -NHx and tertiary nitrogens. Our study provides a clear theoretical reference for X-ray spectral fingerprints of different local structures, which is useful for analysis of g-C3N4 based materials with various designed or unavoidable structural modifications. We also highlight our combined cluster-periodic approach in calculating the K-edge XPS spectra of general 2D materials which predicts accurate absolute values.
- Published
- 2019
31. Direct thiocarbamation of imidazoheterocycles via dual C–H sulfurization
- Author
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Jie-Cheng Huang, Jian-Chao Deng, Zhi-Sheng Lai, Ri-Yuan Tang, Zi-Ning Cui, Ming‐Hua Li, Jun-Rong Zhang, and Xin-Yu Tong
- Subjects
010405 organic chemistry ,Chemistry ,Organic Chemistry ,chemistry.chemical_element ,010402 general chemistry ,01 natural sciences ,Biochemistry ,Combinatorial chemistry ,Sulfur ,0104 chemical sciences ,chemistry.chemical_compound ,Succinimide ,Physical and Theoretical Chemistry ,Phosgene ,Formamides - Abstract
A copper-catalyzed DTBP oxidative dual C-H sulfurization has been developed for the direct thiocarbamation of imidazopyridines using a combination of elemental sulfur and formamides as carbamothioyl surrogates. NBS (bromo succinimide) was found to promote the thiocarbamation in good yields. This dual C-H sulfurization strategy enables access to a wide range of carbamothioyl imidazoheterocycles without the use of highly toxic phosgene.
- Published
- 2019
32. Sulfite-InducedN-Alkylation and Thioketonization of Azoles Enable Access to Diverse Azole Thiones
- Author
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Jun-Rong Zhang, Ting-Ting Lu, Jian-Chao Deng, Ri-Yuan Tang, and Jia-Hao Chen
- Subjects
chemistry.chemical_classification ,010405 organic chemistry ,chemistry.chemical_element ,General Chemistry ,Alkylation ,010402 general chemistry ,01 natural sciences ,Sulfur ,Combinatorial chemistry ,0104 chemical sciences ,chemistry.chemical_compound ,chemistry ,Sulfite ,Azole - Published
- 2018
33. Theoretical study of nano onion-like fullerenes C20@C80 on XPS and NEXAFS spectra
- Author
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Chuan-Kui Wang, Jing Hu, Xiu-Neng Song, Shu-Qiong Yang, Sheng-Yu Wang, Yong Zhou, Jun-Rong Zhang, Yong Ma, and Juan Lin
- Subjects
Materials science ,Fullerene ,010304 chemical physics ,Biophysics ,chemistry.chemical_element ,010402 general chemistry ,Condensed Matter Physics ,01 natural sciences ,Spectral line ,XANES ,0104 chemical sciences ,X-ray photoelectron spectroscopy ,chemistry ,0103 physical sciences ,Nano ,Physical chemistry ,Physical and Theoretical Chemistry ,Absorption (electromagnetic radiation) ,Spectroscopy ,Molecular Biology ,Carbon - Abstract
The X-ray photoelectron spectroscopy (XPS) and near-edge X-ray absorption fine structure (NEXAFS) spectroscopy of the carbon K-edge for the two nano onion-like fullerenes (NOLFs) C20@C80 isomers have been in theory performed by density functional theory (DFT) method. We have especially focussed on the structure-spectroscopy relationship by exploring in detail and analyzing systematically the calculated spectra. Both the XPS and NEXAFS spectra show dependence on molecular structures, so these two spectroscopic techniques can be used to identify the two NOLFs C20@C80 isomers. Meanwhile, the spectral components of each C20@C80 isomer based on the local environment of carbon atoms have been calculated at the same level. Furthermore, we have tested the feasibility of using the building block (BB) approach to quickly estimate the XPS and NEXAFS spectra in the NOLFs C20@C80 system. Results show that applying the BB approach is impossible to predict the direct calculated results for the NOLFs C20@C80. Additionally, fullerene C100(D2) as an isomer of C20@C80 can be distinguished from the two C20@C80 isomers by the XPS and NEXAFS spectra.
- Published
- 2018
34. Distinguishing the six stable C36 fullerene isomers by means of soft X-ray spectroscopies at DFT level
- Author
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Yong Ma, Sheng-Yu Wang, Jun-Rong Zhang, Jing Hu, Juan Lin, and Xiu-Neng Song
- Subjects
Soft x ray ,Materials science ,Fullerene ,010304 chemical physics ,Biophysics ,010402 general chemistry ,Condensed Matter Physics ,01 natural sciences ,XANES ,0104 chemical sciences ,Crystallography ,X-ray photoelectron spectroscopy ,0103 physical sciences ,Physical and Theoretical Chemistry ,Molecular Biology - Abstract
The six most stable isomers of C36 fullerene (8Cs-C36, 9C2v-C36, 11C2-C36, 12C2-C36, 14D2d-C36, 15D6h-C36) have been distinguished in theory by analysing their C1s X-ray photoelectron spectroscopy ...
- Published
- 2018
35. TNFRSF11B Remodel Immune Response in Colon Cancer Microenvironment: A Multi-Center Study
- Author
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Xian-qiang Chen, Zongqi Weng, Xiao-jie Wang, Ping Hou, Fang You, Hui Wang, Bing-qiang Lin, Xin-chang Shang-guan, Zheng-yuan Huang Huang, and Jun-rong Zhang
- Subjects
Oncology ,medicine.medical_specialty ,business.industry ,Colorectal cancer ,Lymphovascular invasion ,Cancer ,medicine.disease ,Institutional review board ,medicine.anatomical_structure ,Immune system ,Internal medicine ,YWHAZ ,Medicine ,Immunohistochemistry ,business ,Lymph node - Abstract
Background: Colorectal cancer is the lethal cancer in the world, due to the low tumor mutation burden and low proportion of tumor-infiltrating lymphocytes in the microenvironment of most patients, innovative immunotherapeutic approaches need to be identified. Methods: Using TCGA-COAD dataset (n = 514), we identified TNFRSF11B as a prognostic factor of colon cancer. Immunohistochemistry (IHC) dataset (n = 86), 290 single colorectal cancer cells (GSE81861) and 31 paired colon cancer transcriptional dataset were further applied to validate the function of TNFRSF11B, which was confirmed via fluorescence-activated cell sorting (FACS) analysis. Results: A risk scores system consisting of eight IRGs was constructed to predict the prognosis of colon cancer patients. Only TNFRSF11B correlated with TNM-stage, lymph node metastasis and prognosis. In our IHC dataset, High TNFRSF11B expression had a later TNM-stage, higher frequency of lymph node and lymphovascular invasion. Six genes (KRT18, ARPC5L, ACTG1, ARPC2, EZR, YWHAZ) related to pathogenic E. coli. infection were simultaneously increased with TNFRSF11B overexpression via GESA analysis. Finally, only activated memory CD4+ T cells (p =0.017) were significantly decreased in high TNFRSF11B expression group, which was supported by our FACS findings that TNFRSF11B downregulate the immune activity of central memory CD4 + T cells and effector memory CD4+ T cells (all p
- Published
- 2021
36. Theoretical studies on structures and spectral properties for two C86 isomers and their chlorinated derivatives
- Author
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Jun-Rong Zhang, Sheng-Yu Wang, Yong Ma, Xiu-Neng Song, Juan Lin, and Jing Hu
- Subjects
Materials science ,010304 chemical physics ,Spectral properties ,Biophysics ,010402 general chemistry ,Condensed Matter Physics ,01 natural sciences ,Spectral line ,XANES ,0104 chemical sciences ,X-ray photoelectron spectroscopy ,0103 physical sciences ,Physical chemistry ,Physical and Theoretical Chemistry ,Absorption (electromagnetic radiation) ,Molecular Biology - Abstract
The near-edge X-ray absorption fine structure (NEXAFS) spectra and the X-ray photoelectron spectroscopy (XPS), as well as the geometrical structures of two C86 isomers (C86(16), C86(17)) and their ...
- Published
- 2018
37. Accurate K-edge X-ray photoelectron and absorption spectra of g-C
- Author
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Jun-Rong, Zhang, Yong, Ma, Sheng-Yu, Wang, Junfei, Ding, Bin, Gao, Erjun, Kan, and Weijie, Hua
- Abstract
We performed a density functional theory (DFT) study on X-ray photoelectron (XPS) and absorption (XAS) spectra of graphitic carbon nitride (g-C3N4) nanosheets at the N and C K-edges. A combined cluster-periodic approach was employed to calculate XPS spectra, in which the core ionic potential (IP) of the solid 2D material was computed by subtracting the work function (obtained with periodic conditions) from the gas phase IP (obtained with large cluster models). With amino-terminated supermolecules of different sizes, we obtained convergent spectra and provide new assignments for 5 nitrogen [1 sp2; 4 sp3 (bridging, tertiary, and primary/secondary amino nitrogens)] and 4 carbon (all bonded with three nitrogens) local structures. A good agreement with experiments was obtained, with the N1s (C1s) main peak position differing by 0.1-0.2 eV (0.5-0.8 eV). Our simulations show that N1s XPS of pure g-C3N4 contains only two major features at 398.6 and 401.2 eV, contributed from sp2-N and sp3-N, respectively. The chemical shifts of all sp3-N are so close (deviating by 0.3-0.6 eV) that terminal amino groups -NHx (x = 1, 2) will only be distinguished in high-resolution measurements. In C1s XPS, all carbons show similar (deviation0.2 eV) IPs, as determined by the same nearest neighbors. We further excluded the effect of shake-up satellites that may change our XPS interpretations by equivalent core hole time-dependent DFT (ECH-TDDFT) simulations. The effect of vibronic coupling is small (redistribution is only 0.1-0.3 eV to the higher-energy region) in the N1s edge as estimated from the asymmetric main peak shape, and negligible in the C1s edge. Quicker size convergence was found in XAS than XPS. In N1s XAS, we identified a weak π* spectral feature at 400-401 eV for both -NHx and tertiary nitrogens. Our study provides a clear theoretical reference for X-ray spectral fingerprints of different local structures, which is useful for analysis of g-C3N4 based materials with various designed or unavoidable structural modifications. We also highlight our combined cluster-periodic approach in calculating the K-edge XPS spectra of general 2D materials which predicts accurate absolute values.
- Published
- 2019
38. Identification of Four C40 Isomers by Means of a Theoretical XPS/NEXAFS Spectra Study
- Author
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Yong Ma, Jun-Rong Zhang, Juan Lin, Sheng-Yu Wang, Jing Hu, Shu-Qiong Yang, and Xiu-Neng Song
- Subjects
Fullerene ,Chemistry ,chemistry.chemical_element ,02 engineering and technology ,010402 general chemistry ,021001 nanoscience & nanotechnology ,01 natural sciences ,XANES ,Spectral line ,0104 chemical sciences ,Crystallography ,X-ray photoelectron spectroscopy ,Density functional theory ,Physical and Theoretical Chemistry ,0210 nano-technology ,Carbon - Abstract
XPS and NEXAFS spectra of four stable C40 isomers [29(C2), 31(Cs), 38(D2), and 39(D5d)] have been investigated theoretically. We combined density functional theory and the full core hole potential method to simulate C 1s XPS and NEXAFS spectra for nonequivalent carbon atoms of four stable C40 fullerene isomers. The NEXAFS showed obvious dependence on the four C40 isomers, and XPS spectra are distinct for all four isomers, which can be employed to identify the four stable structures of C40. Furthermore, the individual components of the spectra according to different categories have been investigated, and the relationship between the spectra and the local structures of C atoms was also explored.
- Published
- 2018
39. Metal-Free Thiolation of Imidazopyridines with Functionalized Haloalkanes Using Elemental Sulfur
- Author
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Yun-Yun Ning, Liang Wei, Ri-Yuan Tang, Jun-Rong Zhang, Jing‐Xiong Lai, Xiao-Lin Zhong, Ling‐Zhi Zhan, and Li Xu
- Subjects
Imidazopyridine ,chemistry.chemical_compound ,Thioether ,Metal free ,010405 organic chemistry ,Chemistry ,chemistry.chemical_element ,Organic chemistry ,General Chemistry ,010402 general chemistry ,01 natural sciences ,Sulfur ,0104 chemical sciences - Published
- 2018
40. Advances in Radical Oxidative C-H Alkylation ofN-Heteroarenes
- Author
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Jian-Chao Deng, Yan-Yan Liao, Jun-Rong Zhang, Li Xu, and Ri-Yuan Tang
- Subjects
chemistry.chemical_classification ,Alkane ,010405 organic chemistry ,General Chemistry ,Oxidative phosphorylation ,Alkylation ,010402 general chemistry ,01 natural sciences ,0104 chemical sciences ,chemistry ,Organic chemistry ,lipids (amino acids, peptides, and proteins) ,Oxidative coupling of methane ,Alkyl - Abstract
This review summarizes recent development in C—H alkylation of N-heteroarenes via the radical oxidative coupling process. A variety of alkyl radical sources (including alkanes, ethers, alcohols, carboxylic acids, organoboranes, and some other alkane derivatives) for C—H alkylation of N-heteroarenes are reviewed.
- Published
- 2017
41. DABCO-Promoted Decarboxylative Acylation: Synthesis of α-Keto and α,β-Unsaturated Amides or Esters
- Author
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Ri-Yuan Tang, Jian-Chao Deng, Zi-Liang Tang, Yan-Yan Liao, Yuan-Lin Xu, Jun-Rong Zhang, and Li Xu
- Subjects
chemistry.chemical_classification ,010405 organic chemistry ,Decarboxylation ,Carboxylic acid ,Organic Chemistry ,DABCO ,010402 general chemistry ,01 natural sciences ,0104 chemical sciences ,Acylation ,chemistry.chemical_compound ,chemistry ,Reagent ,Organic chemistry ,lipids (amino acids, peptides, and proteins) ,Metal catalyst ,Alkyl ,Octane - Abstract
1,4-Diazabicyclo[2.2.2]octane (DABCO) was found to be an effective reagent for decarboxylative acylation of carboxylic acids with carbamic chlorides or alkyl carbonochloridates. In the absence of metal catalyst, carboxylic acids including α-ketocarboxylic, cinnamic and arylpropiolic acids underwent the decarboxylative acylation smoothly to afford a variety of α-keto (or α,β-unsaturated) amides and esters in good to excellent yields.
- Published
- 2017
42. CuCl/air-mediated oxidative coupling reaction of imidazoheterocycles with N-aryl glycine esters
- Author
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Li Xu, Yan-Yan Liao, Maolin Hu, Jun-Rong Zhang, Ri-Yuan Tang, and Jing Jiao
- Subjects
Diketone ,010405 organic chemistry ,General Chemical Engineering ,Aryl ,Imine ,chemistry.chemical_element ,General Chemistry ,010402 general chemistry ,01 natural sciences ,Medicinal chemistry ,Peroxide ,Copper ,0104 chemical sciences ,chemistry.chemical_compound ,chemistry ,Glycine ,Pyridine ,Organic chemistry ,Oxidative coupling of methane - Abstract
A copper/air mediated oxidative coupling reaction of imidazoheterocycles with N-aryl glycine esters is here described. The reaction proceeded effectively under an air atmosphere without the use of peroxide agents. This simple protocol allows for the preparation of a wide range of imidazoheterocycles with a glycine ester motif, which are of great interest in the field of medicinal chemistry. Interestingly, the coupling of imidazo[1,2-a]pyridine with secondary or tertiary α-amino phenylethanone selectively affords the imidazo[1,2-a]pyridin-3-yl imine or imidazo[1,2-a]pyridin-3-yl diketone in the presence of CuCl and TBHP (tertbutyl hydroperoxide).
- Published
- 2017
43. Oxidative dual C–H thiolation of imidazopyridines with ethers or alkanes using elemental sulphur
- Author
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Zi-Wei Lin, Yan-Yan Liao, Ri-Yuan Tang, Yun-Yun Ning, Jian-Chao Deng, Min Zhang, Jun-Rong Zhang, and Kai-Ying Feng
- Subjects
010405 organic chemistry ,Stereochemistry ,Metals and Alloys ,chemistry.chemical_element ,General Chemistry ,Oxidative phosphorylation ,010402 general chemistry ,01 natural sciences ,Sulfur ,Catalysis ,0104 chemical sciences ,Surfaces, Coatings and Films ,Electronic, Optical and Magnetic Materials ,chemistry ,Materials Chemistry ,Ceramics and Composites ,Organic chemistry - Abstract
Dual C–H thiolation reactions using elemental sulphur remain a challenge. This communication discloses an oxidative radical dual sp2/sp3 C–H thiolation strategy for the coupling of imidazopyridines with ethers or alkanes using elemental sulphur.
- Published
- 2017
44. Lymphocyte-to-monocyte ratio effectively predicts survival outcome of patients with obstructive colorectal cancer
- Author
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Xian-qiang Chen, Ping Hou, Bing-qiang Lin, Chao-Rong Xue, and Jun-rong Zhang
- Subjects
Male ,Colorectal cancer ,Lymphocyte ,medicine.medical_treatment ,Inflammation indexes ,Self-expanding metal stent insertion as a bridge to surgery ,Kaplan-Meier Estimate ,Gastroenterology ,Monocytes ,Leukocyte Count ,0302 clinical medicine ,Risk Factors ,Lymphocytes ,Lymph node ,General Medicine ,Middle Aged ,Decompression, Surgical ,Prognosis ,medicine.anatomical_structure ,Elective Surgical Procedures ,030220 oncology & carcinogenesis ,Preoperative Period ,Emergency surgery ,Biomarker (medicine) ,030211 gastroenterology & hepatology ,Female ,Colorectal Neoplasms ,Adult ,medicine.medical_specialty ,Self Expandable Metallic Stents ,Disease-Free Survival ,03 medical and health sciences ,Retrospective Study ,Internal medicine ,Obstructive colorectal cancers ,medicine ,Humans ,Risk factor ,Emergency Treatment ,Aged ,Receiver operating characteristic ,Proportional hazards model ,business.industry ,Patient Selection ,Stent ,medicine.disease ,ROC Curve ,business ,Intestinal Obstruction - Abstract
BACKGROUND Obstructive colorectal cancer (OCC) is always accompanied by severe complications, and the optimal strategy for patients with OCC remains undetermined. Different from emergency surgery (ES), self-expandable metal stents (SEMS) as a bridge to surgery (BTS), could increase the likelihood of primary anastomosis. However, the stent failure and related complications might give rise to a high recurrence rate. Few studies have focused on the indications for either method, and the relationship between preoperative inflammation indexes and the prognosis of OCC is still underestimated. AIM To explore the indications for ES and BTS in OCCs based on preoperative inflammation indexes. METHODS One hundred and twenty-eight patients who underwent ES or BTS from 2008 to 2015 were enrolled. Receiver operating characteristic (ROC) curve analysis was used to define the optimal preoperative inflammation index and its cutoff point. Kaplan-Meier analyses and Cox proportional hazards models were applied to assess the association between the preoperative inflammation indexes and the survival outcomes [overall survival (OS) and disease-free survival (DFS)]. Stratification analysis was performed to identify the subgroups that would benefit from ES or BTS. RESULTS OS and DFS were comparable between the ES and BTS groups (P > 0.05). ROC curve analysis showed derived neutrophil-to-lymphocyte ratio (dNLR) as the optimal biomarker for the prediction of DFS in ES (P < 0.05). Lymphocyte-to-monocyte ratio (LMR) was recommended for BTS with regard to OS and DFS (P < 0.05). dNLR was related to stoma construction (P = 0.001), pneumonia (P = 0.054), and DFS (P = 0.009) in ES. LMR was closely related to lymph node invasion (LVI) (P = 0.009), OS (P = 0.020), and DFS (P = 0.046) in the BTS group. dNLR was an independent risk factor for ES in both OS (P = 0.032) and DFS (P = 0.016). LMR affected OS (P = 0.053) and DFS (P = 0.052) in the BTS group. LMR could differentiate the OS between the ES and BTS groups (P < 0.05). CONCLUSION Preoperative dNLR and LMR could predict OS and DFS in patients undergoing ES and BTS, respectively. For OCC, as the potential benefit group, patients with a low LMR might be preferred for BTS via SEMS insertion.
- Published
- 2019
45. Predicting and researching adsorption configurations of pyridazine on Si(100) surface by means of X-ray spectroscopies in theory
- Author
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Yong Ma, Jun-Rong Zhang, Chuan-Kui Wang, Yong Zhou, and Xiu-Neng Song
- Subjects
Surface (mathematics) ,Materials science ,010304 chemical physics ,business.industry ,Biophysics ,X-ray ,010402 general chemistry ,Condensed Matter Physics ,01 natural sciences ,XANES ,0104 chemical sciences ,Pyridazine ,chemistry.chemical_compound ,Adsorption ,Semiconductor ,X-ray photoelectron spectroscopy ,chemistry ,0103 physical sciences ,Molecule ,Physical chemistry ,Physical and Theoretical Chemistry ,business ,Molecular Biology - Abstract
The landscape of organic molecule on Si(100) surface has a great significance for organic functionalisation of Si semiconductor. Several possible adsorption configurations for pyridazine on Si(100) surface have been forecasted by systemic comparison and investigation. The C1s XPS and NEXAFS spectra of these adsorption systems based on density functional theory and full core-hole potential approximation have been calculated. Although the sensibility of XPS to these adsorption configurations is not very strong, these configurations can be absolutely distinguished by NEXAFS spectra, which will bring tremendous reference to the future experimental study. Mode II, III, V and VI have a significantly higher adsorption energy, which are most likely to be present in experiment. In addition, we have made the research on specific sources of the peaks in spectra by analysing their decomposed NEXAFS spectra, the results show that the Carbon atoms which do not bond to surface atoms, make the most contribute to the intensity of characteristic peaks in spectra.
- Published
- 2019
- Full Text
- View/download PDF
46. Electronic structures and spectral characteristics of the six C
- Author
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Juan, Lin, Jing, Hu, Jun-Rong, Zhang, Sheng-Yu, Wang, Yong, Ma, and Xiu-Neng, Song
- Abstract
In this paper, the six C
- Published
- 2018
47. Planning of Energy-Selective Neutron Imaging Instrument at CSNS and its Application Prospect in Materials Science
- Author
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Lun Hua He, Fang Wei Wang, Jie Chen, and Jun Rong Zhang
- Subjects
Materials science ,business.industry ,Mechanical Engineering ,Neutron imaging ,Neutron diffraction ,0211 other engineering and technologies ,Phase-contrast imaging ,02 engineering and technology ,Neutron radiation ,021001 nanoscience & nanotechnology ,Condensed Matter Physics ,Optics ,Mechanics of Materials ,021105 building & construction ,Neutron detection ,Neutron source ,General Materials Science ,Neutron ,Nuclear Experiment ,0210 nano-technology ,business ,Spallation Neutron Source - Abstract
In order to serve a growing multidisciplinary community beyond the traditional scattering areas, an energy-selective neutron imaging instrument is proposed in the China Spallation Neutron Source (CSNS). The instrument is planned to provide analytical techniques such as state-of-the-art energy-selective neutron imaging, neutron radiography, tomography, polarized neutron imaging, neutron phase contrast imaging, and combined neutron diffraction. Coupled hydrogen moderator (CHM) will be chosen as its neutron source. A flight path of 40 m from moderator to sample will provide good energy resolution better than ~0.4%. Super mirror neutron guide will be used to transport neutron from moderator to aperture selector. Aperture selector with 5 apertures and a set of slits will be used to adjust the neutron beam for different modalities. The best spatial resolution will be 50 μm. Different types of detectors will be needed including high spatial resolution CCD camera, TOF detector, and scintillator detector. With a main emphasis on advanced materials and engineering studies, the instrument will enable 2D/3D mapping of the microstructure, chemical composition, and crystallographic structure (grain size, stress and strain, phase position, texture, and so on). It will also support a broad range of studies in archaeology, biology, biomedicine, geosciences, building technology, manufacturing processes, forensic, and homeland security applications.
- Published
- 2016
48. The expression of presenilin 1 enhances carcinogenesis and metastasis in gastric cancer
- Author
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Yun Li, Fei-Chao Huang, Jia-Bin Wang, Ping Li, Jun Lu, Jian-Wei Xie, Jun-Rong Zhang, Xi Lin, Chang-Ming Huang, and Chao-Hui Zheng
- Subjects
Male ,0301 basic medicine ,medicine.disease_cause ,Bioinformatics ,Metastasis ,Mice ,0302 clinical medicine ,Cell Movement ,PSEN1 ,beta Catenin ,Mice, Inbred BALB C ,biology ,Middle Aged ,Cadherins ,Actin Cytoskeleton ,Cell Transformation, Neoplastic ,Oncology ,Lymphatic Metastasis ,030220 oncology & carcinogenesis ,Female ,TCF Transcription Factors ,Research Paper ,Lymphoid Enhancer-Binding Factor 1 ,PS-1 ,Diamines ,Presenilin ,03 medical and health sciences ,Stomach Neoplasms ,Cell Line, Tumor ,Presenilin-1 ,medicine ,Animals ,Humans ,Gene silencing ,Neoplasm Invasiveness ,Cell Proliferation ,business.industry ,gastric cancer ,E-cadherin ,Cancer ,β-catenin ,medicine.disease ,Actin cytoskeleton ,Enzyme Activation ,Thiazoles ,030104 developmental biology ,biology.protein ,Cancer research ,tumorigenicity ,Carcinogenesis ,business ,Amyloid precursor protein secretase - Abstract
Presenilin 1 (PS-1, encoded by PSEN1) is a part of the gamma− (γ−) secretase complex. Mutations in PSEN1 cause the majority of cases of familial Alzheimer's disease (FAD). Although in recent years PS-1 has been implicated as a tumor enhancer in various cancers, nothing is known regarding its role in gastric cancer (GC). In the present study, we investigate the role and clinical significance of PS-1 in GC. We observed that PS-1 was significantly upregulated and amplified in GC tissues and cell lines, and its aberrant expression was positively correlated with lymph node metastasis and with poor overall survival. Furthermore, PS-1 promoted tumor invasion and metastasis of GC both in vitro and vivo without affecting the proliferation of GC cells (MGC-803 and MKN-45). The results of treatment with the γ-secretase inhibitor DAPT were consistent with the outcomes of PS-1 silencing. PS-1/γ-secretase cleaves E-cadherin and releases its bound protein partner, β-catenin, from the actin cytoskeleton, thereby allowing it to translocate into the nucleus and to activate the TCF/LEF-1 transcriptional activator, which may promote GC invasion and metastasis. In conclusion, PS-1 promotes invasion and metastasis in GC and may represent a novel prognostic biomarker and potential therapeutic target for GC treatment.
- Published
- 2016
49. Dynamic Prediction Method for Hydraulic Structure Concrete Strength
- Author
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Gang Cui, Cun Cai, Jun Lu, Jun Rong Zhang, and Jia Xiang Tao
- Subjects
Moment (mathematics) ,Bayes' theorem ,Engineering ,Hydraulic structure ,Dynamic prediction ,business.industry ,General Medicine ,Structural engineering ,business ,Safety testing ,Predictive modelling - Abstract
At present, we usually obtain the prediction models of hydraulic structure concrete strength through lots of tests or engineering experience. But when we use the models to predict the concrete strength at a certain time , there may be some discrepancies with the actual value, even some unreasonable situations. During the service period of hydraulic structure, we can get some new information about the concrete strength by the means of safety testing, monitoring or experimenting. With reference to these new information, the Bayes dynamic prediction method can update the time-varying model of concrete strength mentioned above. This method can more accurately predict the concrete strength value of the next moment.
- Published
- 2015
50. Structural recognition of three significant C88 isomers and its chlorinated derivatives by X-ray spectroscopy
- Author
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Sheng-Yu Wang, Yong Ma, Chuan-Kui Wang, Ruo-Yu Wang, Jun-Rong Zhang, and Xiu-Neng Song
- Subjects
X-ray spectroscopy ,Fullerene ,Materials science ,010304 chemical physics ,Biophysics ,010402 general chemistry ,Condensed Matter Physics ,01 natural sciences ,XANES ,Spectral line ,0104 chemical sciences ,Crystallography ,X-ray photoelectron spectroscopy ,0103 physical sciences ,polycyclic compounds ,Physical and Theoretical Chemistry ,Molecular Biology - Abstract
The structures of three important isomers and their corresponding chlorinated derivatives for fullerene C88 are studied, and their NEXAFS and XPS spectra are stimulated at the density funct...
- Published
- 2020
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