1
|
Yu JL, Li Z, Zhang B, Huang YN, Zhao TY. Case report: Kikuchi-Fujimoto disease: unveiling a case of recurrent fever and enlarged cervical lymph nodes in a young female patient with a literature review of the immune mechanism. Front Immunol 2024; 14:1279592. [PMID: 38313434 PMCID: PMC10837848 DOI: 10.3389/fimmu.2023.1279592] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2023] [Accepted: 12/27/2023] [Indexed: 02/06/2024] Open
Abstract
The inflammatory response to viral infection is an important component of the antiviral response, a process that involves the activation and proliferation of CD8+ T, CD4+ T, and dendritic cells; thus, viral infection disrupts the immune homeostasis of the organism, leading to an increased release of inflammatory factors. Kikuchi-Fujimoto disease (KFD) is an inflammatory self-limited disorder of unknown etiology, and it is generally believed that the pathogenesis of this disease includes two aspects: viral infection and autoimmune response. Various immune cells, such as CD8+ T lymphocytes, CD4+ T lymphocytes, and CD123+ plasmacytoid dendritic cells, as well as the cytokines they induce and secrete, such as interferons, interleukins, and tumor necrosis factors, play a crucial role in the pathogenesis of KFD. In this article, we present a case study of a young female patient from China who exhibited typical symptoms of lymph node inflammation and fever. The diagnosis of KFD was confirmed through a lymph node biopsy. She presented with elevated ESR, IL-6, and IFN-γ. Viral markers showed elevated IgG and IgM of cytomegalovirus (CMV) and elevated IgG of Epstein-Barr virus (EBV), while changes occurred in the CD4+ T and CD8+ T cell counts. Eventually, the patient achieved disease relief through steroid treatment. Based on these findings, we conducted a comprehensive review of the involvement of viral infection-induced inflammatory response processes and autoimmunity in the pathogenesis of Kikuchi-Fujimoto disease.
Collapse
Affiliation(s)
- Jia-Li Yu
- Department of Gastroenterology, The First Affiliated Hospital of Dalian Medical University, Dalian, China
| | - Zhen Li
- Department of Gastroenterology, The First Affiliated Hospital of Dalian Medical University, Dalian, China
| | - Bo Zhang
- Department of Pathology, The First Affiliated Hospital of Dalian Medical University, Dalian, China
| | - Ya-Nan Huang
- Department of Infectious Disease, The First Affiliated Hospital of Dalian Medical University, Dalian, China
| | - Tian-Yu Zhao
- Department of Infectious Disease, The First Affiliated Hospital of Dalian Medical University, Dalian, China
| |
Collapse
|
2
|
Huang YN, Yan FH, Wang XY, Chen XL, Chong HY, Su WL, Chen YR, Han L, Ma YX. Prevalence and Risk Factors of Frailty in Stroke Patients: A Meta-Analysis and Systematic Review. J Nutr Health Aging 2023; 27:96-102. [PMID: 36806864 DOI: 10.1007/s12603-023-1879-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
OBJECTIVES Summarize the existing evidence regarding the prevalence and risk factors of frailty in stroke patients. DESIGN A meta-analysis and systematic review. PARTICIPANTS Stroke patients in hospitals or communities. METHODS We undertook a systematic review and meta-analysis using articles available in 8 databases, including PubMed, The Cochrane Library, Web of Science, Embase, Chinese Biomedical Database (CBM), China National Knowledge Infrastructure Database (CNKI), Wanfang Database, and Weipu Database (VIP) from January 1990 to April 2022. Studies were quality rated using the Newcastle-Ottawa Scale and Agency for Healthcare Research and Quality tool. RESULTS A total of 24 studies involving 30,423 participants were identified. The prevalence of frailty and pre-frailty in stroke patients was 27% (95%CI: 0.23-0.31) and 47.9% (95%CI: 0.43-0.53). Female gender (OR = 1.76, 95%CI: 1.63-1.91), advanced age (MD = 6.73, 95%CI: 3.55-9.91), diabetes (OR = 1.34, 95%CI: 1.06-1.69), hyperlipidemia (OR = 1.46, 95%CI: 1.04-2.04), atrial fibrillation (OR = 1.36, 95%CI: 1.01-1.82), National Institutes of Stroke Scale (NIHSS) admission scores (MD = 2.27, 95%CI: 1.72-2.81) were risk factors of frailty in stroke patients. CONCLUSIONS Frailty was more prevalent in stroke patients. Female gender, advanced age, diabetes, hyperlipidemia, atrial fibrillation, and National Institutes of Stroke Scale (NIHSS) admission scores were identified as risk factors for frailty in stroke patients. In the future, medical staff should pay attention to the early screening of frailty in high-risk groups and provide information on its prevention.
Collapse
Affiliation(s)
- Y N Huang
- Yuxia Ma, Lin Han, Lanzhou University, China ,
| | | | | | | | | | | | | | | | | |
Collapse
|
3
|
Hao DL, Zhou JY, Huang YN, Wang HR, Li XH, Guo HL, Liu JX. Roles of plastid-located phosphate transporters in carotenoid accumulation. Front Plant Sci 2022; 13:1059536. [PMID: 36589064 PMCID: PMC9798012 DOI: 10.3389/fpls.2022.1059536] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/01/2022] [Accepted: 11/28/2022] [Indexed: 06/17/2023]
Abstract
Enhanced carotenoid accumulation in plants is crucial for the nutritional and health demands of the human body since these beneficial substances are acquired through dietary intake. Plastids are the major organelles to accumulate carotenoids in plants and it is reported that manipulation of a single plastid phosphate transporter gene enhances carotenoid accumulation. Amongst all phosphate transport proteins including phosphate transporters (PHTs), plastidial phosphate translocators (pPTs), PHOSPHATE1 (PHO1), vacuolar phosphate efflux transporter (VPE), and Sulfate transporter [SULTR]-like phosphorus distribution transporter (SPDT) in plants, plastidic PHTs (PHT2 & PHT4) are found as the only clade that is plastid located, and manipulation of which affects carotenoid accumulation. Manipulation of a single chromoplast PHT (PHT4;2) enhances carotenoid accumulation, whereas manipulation of a single chloroplast PHT has no impact on carotenoid accumulation. The underlying mechanism is mainly attributed to their different effects on plastid orthophosphate (Pi) concentration. PHT4;2 is the only chromoplast Pi efflux transporter, and manipulating this single chromoplast PHT significantly regulates chromoplast Pi concentration. This variation subsequently modulates the carotenoid accumulation by affecting the supply of glyceraldehyde 3-phosphate, a substrate for carotenoid biosynthesis, by modulating the transcript abundances of carotenoid biosynthesis limited enzyme genes, and by regulating chromoplast biogenesis (facilitating carotenoid storage). However, at least five orthophosphate influx PHTs are identified in the chloroplast, and manipulating one of the five does not substantially modulate the chloroplast Pi concentration in a long term due to their functional redundancy. This stable chloroplast Pi concentration upon one chloroplast PHT absence, therefore, is unable to modulate Pi-involved carotenoid accumulation processes and finally does affect carotenoid accumulation in photosynthetic tissues. Despite these advances, several cases including the precise location of plastid PHTs, the phosphate transport direction mediated by these plastid PHTs, the plastid PHTs participating in carotenoid accumulation signal pathway, the potential roles of these plastid PHTs in leaf carotenoid accumulation, and the roles of these plastid PHTs in other secondary metabolites are waiting for further research. The clarification of the above-mentioned cases is beneficial for breeding high-carotenoid accumulation plants (either in photosynthetic or non-photosynthetic edible parts of plants) through the gene engineering of these transporters.
Collapse
Affiliation(s)
- Dong-Li Hao
- The National Forestry and Grassland Administration Engineering Research Center for Germplasm Innovation and Utilization of Warm-Season Turfgrasses, Jiangsu Key Laboratory for the Research and Utilization of Plant Resources, Institute of Botany, Jiangsu Province and Chinese Academy of Sciences (Nanjing Botanical Garden Mem. Sun Yat-Sen), Nanjing, China
| | - Jin-Yan Zhou
- Department of Agronomy and Horticulture, Jiangsu Vocational College of Agriculture and Forest, Jurong, China
| | - Ya-Nan Huang
- Co-Innovation Center for Sustainable Forestry in Southern China, College of Biology and the Environment, Nanjing Forestry University, Nanjing, China
| | - Hao-Ran Wang
- The National Forestry and Grassland Administration Engineering Research Center for Germplasm Innovation and Utilization of Warm-Season Turfgrasses, Jiangsu Key Laboratory for the Research and Utilization of Plant Resources, Institute of Botany, Jiangsu Province and Chinese Academy of Sciences (Nanjing Botanical Garden Mem. Sun Yat-Sen), Nanjing, China
| | - Xiao-Hui Li
- The National Forestry and Grassland Administration Engineering Research Center for Germplasm Innovation and Utilization of Warm-Season Turfgrasses, Jiangsu Key Laboratory for the Research and Utilization of Plant Resources, Institute of Botany, Jiangsu Province and Chinese Academy of Sciences (Nanjing Botanical Garden Mem. Sun Yat-Sen), Nanjing, China
| | - Hai-Lin Guo
- The National Forestry and Grassland Administration Engineering Research Center for Germplasm Innovation and Utilization of Warm-Season Turfgrasses, Jiangsu Key Laboratory for the Research and Utilization of Plant Resources, Institute of Botany, Jiangsu Province and Chinese Academy of Sciences (Nanjing Botanical Garden Mem. Sun Yat-Sen), Nanjing, China
| | - Jian-Xiu Liu
- The National Forestry and Grassland Administration Engineering Research Center for Germplasm Innovation and Utilization of Warm-Season Turfgrasses, Jiangsu Key Laboratory for the Research and Utilization of Plant Resources, Institute of Botany, Jiangsu Province and Chinese Academy of Sciences (Nanjing Botanical Garden Mem. Sun Yat-Sen), Nanjing, China
| |
Collapse
|
4
|
Zhang XH, Qin HY, Huang YL, Huang YN, Qiao ZH. [Intertemporal allocation and cost of forest carbon sequestration in China under the carbon neutrality target]. Ying Yong Sheng Tai Xue Bao 2022; 33:2413-2421. [PMID: 36131657 DOI: 10.13287/j.1001-9332.202209.027] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
The situations are complex and variant in the three stages of "carbon emission peak", "rapid reduction of carbon emission" and "deep decarbonization for carbon neutrality" in China's carbon neutralization roadmap. Forest carbon sequestration is an important means to achieve the goal of carbon neutralization in China. Its intertemporal allocation is a vital way to balance industrial emission reduction and forest carbon sequestration, reduce the cost of carbon neutrality, and gradually achieve the goal of carbon neutrality based on optimal cost. Based on the cost optimization allocation theory, we simulated the cost change process of three stages of carbon neutralization in China by quoting the theory of marginal carbon sequestration cost and combining with the existing domestic marginal abatement cost theory. The results showed that annual forest carbon sequestrations with the optimal cost in China was 20 million t, 775 million t and 1.982 billion t respectively in the three stages of "carbon emission peak", "rapid reduction of carbon emission" and "deep decarbonization for carbon neutrality", accounting for 1.8%, 17.5%, and 37.6% of the total emission reduction in each period. Compared with the way relying only on industrial emission reduction, forest carbon sequestration under the optimal cost design reduced the total cost by 48, 79136, and 909253 million US$ in the three stages of carbon neutralization, respectively. Due to the limited cost advantage of forest carbon sequestration, industrial emission reduction should be emphasized in the "carbon emission peak" stage. In the "rapid reduction of carbon emissions" stage, the cost advantage of forest carbon sequestration will be increasingly prominent. In the stage of "deep decarbonization for carbon neutrality", it is necessary to fully exploit the cost advantage of forest carbon sequestration to achieve the goal of "zero carbon" to avoid the risk of high costs, especially for industries with high decarbonization cost or that will never be completely decarbonized. The optimal cost design for forest carbon sequestration can save 988.437 billion US $ in carbon-neutral costs.
Collapse
|
5
|
Chen HS, Yang Y, Ni J, Chen GF, Ji Y, Yi F, Zhang ZB, Wu J, Cai XL, Shao B, Wang JF, Liu YF, Geng DQ, Qu XH, Li XH, Wei Y, Han SG, Zhu RX, Ding JP, Lyu H, Huang YN, Huang YH, Xiao B, Gong T, Yu XF, Cui LY. [Effects of cinepazide maleate injection on blood pressure in patients with acute ischemic stroke and hypertension]. Zhonghua Nei Ke Za Zhi 2022; 61:916-920. [PMID: 35922216 DOI: 10.3760/cma.j.cn112138-20210822-00574] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Objective: To investigate the blood pressure change in patients with acute ischemic stroke (AIS) and hypertension treated with cinepazide maleate injection. Methods: This was a subgroup analysis of post-marketing clinical confirmation study of cinepazide maleate injection for acute ischemic stroke: a randomized, double-blinded, multicenter, placebo-parallel controlled trial, which conducted in China from August 2016 to February 2019. Eligible patients fulfilled the inclusive criteria of acute anterior circulation ischemic stroke with National Institutes of Health Stroke Scale (NIHSS) scores of 7-25. The primary endpoints were mean blood pressure of AIS patients treated with cinepazide maleate or control, which were assessed during the treatment period (14 days), and the proportion of the patients with normal blood pressure was analyzed after the treatment period. Furthermore, a subgroup analysis was performed to investigate a possible effect of the history of hypertension on outcomes. Results: This analysis included 809 patients with hypertension. There was no significant difference in patients blood pressure and the proportion of patients with normal blood pressure (60.5% vs. 59.0%,P>0.05) between cinepazide maleate group and control group. Conclusion: Administration of cinepazide maleate injection does not affect the management of clinical blood pressure in patients with AIS.
Collapse
Affiliation(s)
- H S Chen
- Department of Neurology, General Hospital of Northern Theater Command, Shenyang 110016, China
| | - Y Yang
- Department of Neurology, the First Bethune Hospital of Jilin University, Changchun 130021, China
| | - J Ni
- Department of Neurology, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100730, China
| | - G F Chen
- Department of Neurology, Xuzhou Central Hospital, Xuzhou 221009, China
| | - Y Ji
- Department of Neurology, Tianjin Huanhu Hospital, Tianjin 300350, China
| | - F Yi
- Department of Neurology, JiangXi PingXiang People's Hospital, Pingxiang 337055, China
| | - Z B Zhang
- Department of Neurology, the Fourth Affiliated Hospital of Harbin Medical University, Harbin 150001, China
| | - J Wu
- Department of Neurology, the Second Affiliated Hospital of Nanjing Medical University, Nanjing 210011, China
| | - X L Cai
- Department of Neurology, Lishui Municipal Central Hospital, Lishui 323000, China
| | - B Shao
- Department of Neurology, the First Affiliated Hospital of Wenzhou Medical University, Wenzhou 325000, China
| | - J F Wang
- Department of Neurology, Dalian Municipal Central Hospital, Dalian 116033, China
| | - Y F Liu
- Department of Neurology, Huangshi Central Hospital, Huangshi 435000, China
| | - D Q Geng
- Department of Neurology, the Affiliated Hospital of Xuzhou Medical University, Xuzhou 221002, China
| | - X H Qu
- Department of Neurology, Jiangxi Provincial People's Hospital, Nanchang 330006, China
| | - X H Li
- Department of Neurology, Jinan Central Hospital, Jinan 250013, China
| | - Y Wei
- Department of Neurology, Hengshui People's Hospital (Harrison International Peace Hospital), Hengshui 053000, China
| | - S G Han
- Department of Neurology, Meihekou City Central Hospital, Meihekou 135014, China
| | - R X Zhu
- Department of Neurology, Inner Mongolia People's Hospital, Hohhot 010017, China
| | - J P Ding
- Department of Neurology, Xuanwu Hospital Capital Medical University, Beijing 100053, China
| | - H Lyu
- Department of Neurology, Shaanxi Provincial People's Hospital, Xi'an 710068, China
| | - Y N Huang
- Department of Neurology, Peking University First Hospital, Beijing 100034, China
| | - Y H Huang
- Department of Neurology, the Seventh Medical Center of the Chinese PLA General Hospital, Beijing 100700, China
| | - B Xiao
- Department of Neurology, Xiangya Hospital Central South University, Changsha 410008, China
| | - T Gong
- Department of Neurology, Beijing Hospital, Beijing 100730, China
| | - X F Yu
- Department of Neurology, Shuguang Hospital Affiliated to Shanghai University of Traditional Chinese Medicine, Shanghai 201203, China
| | - L Y Cui
- Department of Neurology, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100730, China
| |
Collapse
|
6
|
Li JQ, Huang YN, Shi PJ, Li Z. [Isotopic characteristics and vapor sources of atmospheric precipitation in the loess region of North Shaanxi, China]. Ying Yong Sheng Tai Xue Bao 2022; 33:1459-1465. [PMID: 35729120 DOI: 10.13287/j.1001-9332.202206.011] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
To explore the hydrogen and oxygen stable isotopes and vapor sources of atmospheric precipitation in the loess region of north Shaanxi, we collected 107 samples of precipitation during 2018 to 2020 in the Dingbian County, Shaanxi Province. After measuring δ18O and δ2H of precipitation, we analyzed the isotopic characteristics and vapor sources of precipitation in different seasons. There was obvious seasonal variability in δ18O and δ2H, in that they were more depleted in the wet season (June-September) but more enriched in the dry season (April-May, October-November). In addition, the deuterium excess values were high in the dry season but low in the wet season. The local meteoric water line was regressed as δ2H=7.35δ18O+4.19 (R2=0.96, P<0.01) with slope and intercept lower than that of the global meteoric water line, indicating an impact of evaporation on isotope fractionation. There was temperature effect in the precipitation isotopes for the whole year and for the dry season, while the precipitation isotopes in the wet season were affected by the combined effects of temperature and rainfall amount. The HYSPLIT model showed that the dry season water vapor mainly came from the Atlantic Ocean and the polar Arctic Ocean, while the wet season vapor mainly came from the Indian Ocean and Pacific subject to the Westerly.
Collapse
Affiliation(s)
- Jia-Qi Li
- College of Natural Resources and Environment, Northwest A&F University, Yangling 712100, Shaanxi, China
| | - Ya-Nan Huang
- College of Natural Resources and Environment, Northwest A&F University, Yangling 712100, Shaanxi, China
| | - Pei-Jun Shi
- College of Natural Resources and Environment, Northwest A&F University, Yangling 712100, Shaanxi, China
| | - Zhi Li
- College of Natural Resources and Environment, Northwest A&F University, Yangling 712100, Shaanxi, China
| |
Collapse
|
7
|
Huang YN, Yang SY, Li JL, Wang SF, Wang JJ, Hao DL, Su YH. The rectification control and physiological relevance of potassium channel OsAKT2. Plant Physiol 2021; 187:2296-2310. [PMID: 34601582 PMCID: PMC8644434 DOI: 10.1093/plphys/kiab462] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/29/2021] [Accepted: 09/07/2021] [Indexed: 05/14/2023]
Abstract
AKT2 potassium (K+) channels are members of the plant Shaker family which mediate dual-directional K+ transport with weak voltage-dependency. Here we show that OsAKT2 of rice (Oryza sativa) functions mainly as an inward rectifier with strong voltage-dependency and acutely suppressed outward activity. This is attributed to the presence of a unique K191 residue in the S4 domain. The typical bi-directional leak-like property was restored by a single K191R mutation, indicating that this functional distinction is an intrinsic characteristic of OsAKT2. Furthermore, the opposite R195K mutation of AtAKT2 changed the channel to an inward-rectifier similar to OsAKT2. OsAKT2 was modulated by OsCBL1/OsCIPK23, evoking the outward activity and diminishing the inward current. The physiological relevance in relation to the rectification diversity of OsAKT2 was addressed by functional assembly in the Arabidopsis (Arabidopsis thaliana) akt2 mutant. Overexpression (OE) of OsAKT2 complemented the K+ deficiency in the phloem sap and leaves of the mutant plants but did not significantly contribute to the transport of sugars. However, the expression of OsAKT2-K191R overcame both the shortage of phloem K+ and sucrose of the akt2 mutant, which was comparable to the effects of the OE of AtAKT2, while the expression of the inward mutation AtAKT2-R195K resembled the effects of OsAKT2. Additionally, OE of OsAKT2 ameliorated the salt tolerance of Arabidopsis.
Collapse
Affiliation(s)
- Ya-Nan Huang
- State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Shun-Ying Yang
- State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China
| | - Jun-Lin Li
- Shandong Institute of Sericulture, Yantai 264002, China
| | - Shao-Fei Wang
- State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China
| | - Jia-Jin Wang
- State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Dong-Li Hao
- State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China
| | - Yan-Hua Su
- State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China
- Author for communication:
| |
Collapse
|
8
|
Hao DL, Zhou JY, Yang SY, Huang YN, Su YH. Functional and Regulatory Characterization of Three AMTs in Maize Roots. Front Plant Sci 2020; 11:884. [PMID: 32676086 PMCID: PMC7333355 DOI: 10.3389/fpls.2020.00884] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/18/2019] [Accepted: 05/29/2020] [Indexed: 06/11/2023]
Abstract
Maize grows in nitrate-dominated dryland soils, but shortly upon localized dressing of nitrogen fertilizers, ammonium is retained as a noticeable form of nitrogen source available to roots. Thus in addition to nitrate, the absorption of ammonium can be an important strategy that promotes rapid plant growth at strong nitrogen demanding stages. The present study reports the functional characterization of three root-expressed ammonium transporters (AMTs), aiming at finding out functional and regulatory properties that correlate with efficient nitrogen acquisition of maize. Using a stable electrophysiological recording method we previously established in Xenopus laevis oocytes that integrates the capture of currents in response to voltage ramps with onsite stability controls, we demonstrate that all three ZmAMT1s engage NH4 + uniporting as ammonium uptake mechanisms. The K m value for ZmAMT1.1a, 1.1b, or ZmAMT1.3 is, respectively, 9.9, 15.6, or 18.6 μM, indicating a typical high-affinity transport of NH4 + ions. Importantly, the uptake currents of these ZmAMT1s are markedly amplified upon extracellular acidification. A pH drop from 7.4 to 5.4 results in a 140.8%, 64.1% or a 120.7% increase of ammonium uptake activity through ZmAMT1.1a, 1.1b, or ZmAMT1.3. Since ammonium uptake by plant roots accompanies a spontaneous acidification to the root medium, the functional promotion of ZmAMT1.1a, 1.1b, and ZmAMT1.3 by low pH is in line with the facilitated ammonium uptake activity in maize roots. Furthermore, the expression of the three ZmAMT1 genes is induced under ammonium-dominated conditions. Thus we describe a facilitated ammonium uptake strategy in maize roots by functional and expression regulations of ZmAMT1 transporters that may coordinate with efficient acquisition of this form of nitrogen source when available.
Collapse
|
9
|
Hao DL, Yang SY, Liu SX, Zhou JY, Huang YN, Véry AA, Sentenac H, Su YH. Functional Characterization of the Arabidopsis Ammonium Transporter AtAMT1;3 With the Emphasis on Structural Determinants of Substrate Binding and Permeation Properties. Front Plant Sci 2020; 11:571. [PMID: 32528489 PMCID: PMC7256485 DOI: 10.3389/fpls.2020.00571] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/14/2020] [Accepted: 04/17/2020] [Indexed: 05/13/2023]
Abstract
AtAMT1;3 is a major contributor to high-affinity ammonium uptake in Arabidopsis roots. Using a stable electrophysiological recording strategy, we demonstrate in Xenopus laevis oocytes that AtAMT1;3 functions as a typical high-affinity NH4 + uniporter independent of protons and Ca2+. The findings that AtAMT1;3 transports methylammonium (MeA+, a chemical analog of NH4 +) with extremely low affinity (K m in the range of 2.9-6.1 mM) led to investigate the mechanisms underlying substrate binding. Homologous modeling and substrate docking analyses predicted that the deduced substrate binding motif of AtAMT1;3 facilitates the binding of NH4 + ions but loosely accommodates the binding of MeA+ to a more superficial location of the permeation pathway. Amongst point mutations tested based on this analysis, P181A resulted in both significantly increased current amplitudes and substrate binding affinity, whereas F178I led to opposite effects. Thus these 2 residues, which flank W179, a major structural component of the binding site, are also important determinants of AtAMT1;3 transport capacity by being involved in substrate binding. The Q365K mutation neighboring the histidine residue H378, which confines the substrate permeation tunnel, affected only the current amplitudes but not the binding affinities, providing evidence that Q365 mainly controls the substrate diffusion rate within the permeation pathway.
Collapse
Affiliation(s)
- Dong-Li Hao
- State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing, China
| | - Shun-Ying Yang
- State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing, China
| | - Shu-Xia Liu
- Department of Computational Biology, Beijing Computing Center, Beijing, China
| | - Jin-Yan Zhou
- State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing, China
| | - Ya-Nan Huang
- State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing, China
| | - Anne-Aliénor Véry
- BPMP, Univ Montpellier, CNRS, INRAE, Institut Agro, Montpellier, France
| | - Hervé Sentenac
- BPMP, Univ Montpellier, CNRS, INRAE, Institut Agro, Montpellier, France
- *Correspondence: Hervé Sentenac,
| | - Yan-Hua Su
- State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing, China
- Yan-Hua Su,
| |
Collapse
|
10
|
Ji WJ, Huang YN, Li BB, Li Z. [Oxygen and hydrogen stable isotope compositions of soil water in deep loess profile under different land use types of northern Shaanxi, China]. Ying Yong Sheng Tai Xue Bao 2019; 30:4143-4149. [PMID: 31840459 DOI: 10.13287/j.1001-9332.201912.020] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Investigation of stable isotope composition under different land use types is helpful for understanding soil water movement and hydrological effects of land use change. We collected soil samples in profiles > 15 m deep under four land use types (i.e. farmland, grassland, Salix cheilophila and Populus sp.) in the loess deposits of northern Shaanxi. We measured hydrogen and oxygen stable isotope composition of soil water to explore the mechanism of soil water movement and the impacts of land use types. The isotope compositions of soil water under four land use types were significantly different. The δD values of soil water under farmland, grassland, S. cheilophila and Populus sp. were -81.1‰--60.1‰, -91.2‰--61.0‰, -87.4‰--63.6‰ and -73.5‰--62.2‰, while the δ18O values were -11.2‰--7.6‰, -12.6‰--8.2‰, -11.5‰--8.1‰ and -9.9‰--7.7‰, respectively. The soil water stable isotopes fluctuated across the profiles. The soil water isotope compositions in the layers of 0-3 m changed sharply, with the δD values being -80.2‰--61.8‰, -75.9‰--65.5‰, -76.0‰--63.6‰ and -73.5‰--62.2‰, respectively. In the layers of 3-12 m, the isotope profiles of farmland and grassland were parabolic, whereas those of S. cheilophila and Populus sp. were relatively stable. Soil water isotope compositions in the layers deeper than 12 m were generally stable with the δD values of -80.8‰--71.5‰, -83.0‰--67.5‰, -87.4‰--76.0‰ and -67.5‰--64.3‰, respectively. Across the four land use types, soil water stable isotope compositions were not significantly different either in the shallow layers or in the deep soil layers, but their differences in the layers of 3-12 m were significant. Soil moisture was mainly recharged from precipitation with piston flow as the main form of soil water movement. Soil water under four land use types might be recharged by wet events of different intensities. Soil water under farmland and grassland could be recharged by wet events of small intensity, but that under S. cheilophila and Populus sp. may be mainly recharged by the rainstorm in summer and autumn.
Collapse
Affiliation(s)
- Wang-Jia Ji
- College of Natural Resources and Environment, Northwest A&F University, Yangling 712100, Shaanxi, China
| | - Ya-Nan Huang
- College of Natural Resources and Environment, Northwest A&F University, Yangling 712100, Shaanxi, China
| | - Bing-Bing Li
- College of Natural Resources and Environment, Northwest A&F University, Yangling 712100, Shaanxi, China
| | - Zhi Li
- College of Natural Resources and Environment, Northwest A&F University, Yangling 712100, Shaanxi, China
| |
Collapse
|
11
|
Jin SJ, Liu C, Wang R, Guo KP, Huang YN, Li PX, Ma YC, Xu ST, Ding CH, Zhou JJ, Chen FS. Disodium Guanylate Alleviates Acute Hepatic Injury Induced by Carbon Tetrachloride Via Antioxidative Stress and Antiapoptosis In Vivo and In Vitro. J Food Sci 2019; 84:2658-2665. [PMID: 31441515 DOI: 10.1111/1750-3841.14677] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2019] [Revised: 04/26/2019] [Accepted: 05/05/2019] [Indexed: 11/27/2022]
Abstract
Hepatic injury is one of the most common digestive system diseases worldwide in clinic. Guanylic acid or guanosine monophosphate (GMP) was an important component of nucleotides, which is mainly in the form of sodium salt (disodium guanylate, GMP-Na2 ). However, its effect on hepatic injury has not yet been investigated. This study is to investigate the protective effects of GMP-Na2 on acute hepatic injury induced by carbon tetrachloride (CCl4 ), and to explore its mechanism. The hepatic injury models of mice and HL-7702 cells were induced by CCl4 . The alanine transaminase (ALT), aspartate aminotransferase (AST), superoxide dismutase (SOD), glutathione peroxidase (GSH-Px), malondialdehyde (MDA), total antioxidant capacity (T-AOC) were determined by biochemical method. Hematoxylin-eosin staining were used to determine the morphological changes on liver tissue in mice. The mRNA and protein expressions of caspase-3, Bax, and Bcl-2 were detected by RT-PCR and Western blot analysis. Our results show that GMP-Na2 treatment significantly decreased the activities of ALT and AST, and the levels of MDA as well as increased the levels of SOD, GSH-Px, and T-AOC. Importantly, GMP-Na2 effectively enhanced the antiapoptosis function by upregulating Bcl-2 expression and downregulating caspase-3 and Bax expressions in vivo and in vitro. Moreover, the histopathological changes of liver tissue were obviously improved after GMP-Na2 treatment. These findings suggest that GMP-Na2 has protective effects on hepatic injury, and its mechanisms may be associated with antioxidative stress and antiapoptosis.
Collapse
Affiliation(s)
- Shao-Ju Jin
- College of Food Science and Technology, Henan Univ. of Technology, Zhengzhou, Henan, 450001, China.,Henan Nanjiecun (Group) Co., Ltd., Linying, Henan, 462600, China.,Luohe Medical College and Tumor Occurrence and Prevention Research Innovation Team of Henan, Luohe, Henan, 462002, China
| | - Chen Liu
- College of Food Science and Technology, Henan Univ. of Technology, Zhengzhou, Henan, 450001, China
| | - Rong Wang
- Dept. of Nuclear Medicine, General Hospital of Ningxia Medical Univ., Yinchuan, Ningxia, 750004, China
| | - Kun-Peng Guo
- Luohe Medical College and Tumor Occurrence and Prevention Research Innovation Team of Henan, Luohe, Henan, 462002, China
| | - Ya-Nan Huang
- Henan Nanjiecun (Group) Co., Ltd., Linying, Henan, 462600, China
| | - Pan-Xin Li
- Henan Nanjiecun (Group) Co., Ltd., Linying, Henan, 462600, China
| | - Yong-Chao Ma
- Henan Nanjiecun (Group) Co., Ltd., Linying, Henan, 462600, China.,Luohe Medical College and Tumor Occurrence and Prevention Research Innovation Team of Henan, Luohe, Henan, 462002, China
| | - Song-Tao Xu
- Luohe Medical College and Tumor Occurrence and Prevention Research Innovation Team of Henan, Luohe, Henan, 462002, China
| | - Chang-He Ding
- College of Food Science and Technology, Henan Univ. of Technology, Zhengzhou, Henan, 450001, China
| | - Jun-Jun Zhou
- Dept. of Pharmacology, Dalian Medical Univ., Dalian, Liaoning, 116044, China
| | - Fu-Sheng Chen
- College of Food Science and Technology, Henan Univ. of Technology, Zhengzhou, Henan, 450001, China
| |
Collapse
|
12
|
Li F, Wang HB, Peng Q, Sun YC, Zhang R, Pang B, Fang J, Zhang J, Huang YN. [Prediction of syncope with nonlinear dynamic analysis during head-up tilt in vasovagal syncope patients]. Beijing Da Xue Xue Bao Yi Xue Ban 2019; 51:430-438. [PMID: 31209413 DOI: 10.19723/j.issn.1671-167x.2019.03.009] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
OBJECTIVE To quantify the relationship between cerebral blood flow velocity and peripheral blood pressure during hypotension period, aiming to predict the brain hypotension before symptomatic occurrence. METHODS Twenty vasovagal syncope (VVS) patients who had a previous clinical history were selected in groups and 20 pair-matched control subjects underwent 70° tilt-up test. The subjects remained supine for 30 minutes before recordings when Doppler probes, electrodes and Finapres device were prepared. After continuous baseline recordings for 10 min, the subjects underwent head up tilt (HUT) test (70°), and were standing upright for 30 minutes or until syncope was imminent. For ethical reasons, the subjects were turned back to supine position immediately after SBP dropped to ≥20 mmHg, when their consciousness persisted. The point of syncope was synchronized for all the subjects by the point SBP reached the minima. Their beat-to-beat blood pressures (BP) were recorded continuously and bilateral middle cerebral artery (MCA) flow velocities were obtained with two 2 MHz Doppler probes from a transcranial Doppler ultrasonography (TCD) system. A nonlinear dynamic method--multimodal pressure flow (MMPF) analysis was introduced to access cerebral autoregulation during different time intervals. We introduced a new indicator--syncope index (SI), which was extracted from blood flow velocity (BFV) signal to evaluate the variation of cerebral vascular tension, and could reflect the deepness of dicrotic notch in BFV signal. RESULTS Compared with the syncope index of the baseline value at the beginning of the tilt test, SI in VVS group showed significantly lower when the VVS occurred (0.16±0.10 vs.0.27±0.10,P<0.01),while there was no significant difference in syncope index between the control group at the end of the tilt test and the baseline value at the beginning of the tilt test. For those VVS patients, pulse index and resistance index had no significant change. Syncope index decreased significantly 3 minutes before the point of syncope (0.23±0.07 vs.0.29±0.07,P<0.01). CONCLUSION Dynamic regulation is exhausted when vasovagal syncope occurred. Tension decrease of small vessels could have some relationship with loss of the cerebral autoregulation capability. The proposed syncope index could be a useful parameter in predicting syncope of VVS patients since it decreased significantly up to 3 minutes earlier from the point of syncope.
Collapse
Affiliation(s)
- F Li
- Department of Neurology, Peking University First Hospital, Beijing 100034, China
| | - H B Wang
- Academy of Advanced Interdisciplinary Study, Peking University, Beijing 100871,China
| | - Q Peng
- Department of Neurology, Peking University First Hospital, Beijing 100034, China
| | - Y C Sun
- Department of Neurology, Peking University First Hospital, Beijing 100034, China
| | - R Zhang
- Academy of Advanced Interdisciplinary Study, Peking University, Beijing 100871,China
| | - B Pang
- Academy of Advanced Interdisciplinary Study, Peking University, Beijing 100871,China
| | - J Fang
- Academy of Advanced Interdisciplinary Study, Peking University, Beijing 100871,China
| | - J Zhang
- Academy of Advanced Interdisciplinary Study, Peking University, Beijing 100871,China
| | - Y N Huang
- Department of Neurology, Peking University First Hospital, Beijing 100034, China
| |
Collapse
|
13
|
Huang YN, Zhao ZH, Mao HJ, Yang JF, Wang T, Zhao L, Yang LM, Yu GM, Wang C. [Correlation between DCE-MRI quantitative perfusion histogram parameters, apparent diffusion coefficient and Ki-67 in different pathological types of lung cancer]. Zhonghua Yi Xue Za Zhi 2019; 99:1645-1650. [PMID: 31189264 DOI: 10.3760/cma.j.issn.0376-2491.2019.21.011] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Objective: To explore the efficacy of dynamic contrast enhanced magnetic resonance imaging (DCE-MRI) histogram molecular imaging index, apparent diffusion coefficient (ADC) in different types of lung cancer and explore their correlation with Ki-67. Methods: A total of 33 cases of lung cancer patients confirmed by pathology in Shaoxing People's Hospital from March 2017 to March 2018 were collected, 28 males and 5 females aged 50-85 years old, including 15 cases of squamous cell carcinoma, 12 cases of adenocarcinoma, and 6 cases of small cell carcinoma. All patients performed DCE-MRI and DWI imaging within one week before surgery or puncture. ADC values, DCE-MRI quantitative perfusion parameters by histogram metrics analysis (mean value, skewness, kurtosis, uniformity, entropy, energy, quantile) of K(trans), K(ep), V(e), and V(p) were then collected. Ki-67 expression in lung cancer tissue was detected by immunohistochemical method. One-way analysis of variance and least significant difference were used to compare the differences among the parameters of the three groups which were normal distribution and equal variances, while Kruskal-Walls test and Mann-Whitney U test were used to compare the parameters that did not conform to normal distribution or variance. Pearson correlation analysis was used to compare the correlations between quantitative perfusion histogram parameters, ADC values and immunohistochemical scores of Ki-67. Results: The Ki-67 count in small cell lung cancer(458±82, P=0.011) and squamous cell carcinoma(355±277, P=0.034)were significantly higher than that in adenocarcinoma (168±164). The correlation analysis showed that there was a significant negative correlation between ADC values and Ki-67 (P=0.018, r=-0.416). And V(e) (Q5, Q10) was negatively related to Ki-67 (P=0.017, r=-0.420; P=0.040, r=-0.366). In squamous cell carcinoma patients, V(e) (homogeneity) was significantly negatively correlated with the expression of Ki-67 (P=0.033, r=-0.570). K(trans)(homogeneity) and V(e) (homogeneity, Q5, Q10, Q25) were significantly positively correlated with ADC values (P value from 0.001 to 0.035, r value from 0.545 to 0.765). Conclusion: DCE-MRI quantitative perfusion histogram parameters, ADC value can evaluate the lung cancer cell proliferation activity in different pathological types.
Collapse
Affiliation(s)
- Y N Huang
- Department of Radiology, Shaoxing People's Hospital (Shaoxing Hospital, Zhejiang University School of Medicine), Shaoxing 312000, China
| | - Z H Zhao
- Department of Radiology, Shaoxing People's Hospital (Shaoxing Hospital, Zhejiang University School of Medicine), Shaoxing 312000, China
| | - H J Mao
- Department of Radiology, Shaoxing People's Hospital (Shaoxing Hospital, Zhejiang University School of Medicine), Shaoxing 312000, China
| | - J F Yang
- Department of Radiology, Shaoxing People's Hospital (Shaoxing Hospital, Zhejiang University School of Medicine), Shaoxing 312000, China
| | - T Wang
- Department of Radiology, Shaoxing People's Hospital (Shaoxing Hospital, Zhejiang University School of Medicine), Shaoxing 312000, China
| | - L Zhao
- Department of Radiology, Shaoxing People's Hospital (Shaoxing Hospital, Zhejiang University School of Medicine), Shaoxing 312000, China
| | - L M Yang
- Department of Radiology, Shaoxing People's Hospital (Shaoxing Hospital, Zhejiang University School of Medicine), Shaoxing 312000, China
| | - G M Yu
- Department of Thoracic Surgery, Shaoxing People's Hospital(Shaoxing Hospital, Zhejiang University School of Medicine), Shaoxing 312000, China
| | - C Wang
- Department of Pathology, Shaoxing People's Hospital(Shaoxing Hospital, Zhejiang University School of Medicine), Shaoxing 312000, China
| |
Collapse
|
14
|
Li X, Song LX, Ji DB, Liu DF, Su QQ, Lü LP, Wang X, Huang YN, Wu Q. [Characteristics of Nitrogen Release at the Sediment-Water Interface in the Typical Tributaries of the Three Gorges Reservoir During the Sensitive Period in Spring]. Huan Jing Ke Xue 2018; 39:1113-1121. [PMID: 29965455 DOI: 10.13227/j.hjkx.201707139] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Overlying water and sediment interstitial water samples were acquired to study the nitrogen release between sediments and water interfaces in Xiangxi Bay in April 2016 during the Sensitive Period in spring. The spatial distribution of different forms of nitrogen in the sediment was analyzed, the diffusion fluxes of different forms of nitrogen in the sediments and water systems were also measured, and a correlation analysis with environmental factors was conducted. The results show that overlying water and sediment interstitial water ρ(TN) ranges from 1.10 to 6.90 mg·L-1 and 6.19 to 32.57 mg·L-1 respectively; indicating the nitrogen concentrations in the overlying and interstitial water of sediments have a certain variation along the process and vertically. The interstitial water nitrogen concentrations in the upstream area are higher than those in the downstream area. The interstitial water ρ(NH4+-N) in the sediment is significantly larger than that in the overlying water, but the interstitial water ρ(NO3--N) in the sediment is slightly smaller than that in the overlying water. Xiangxi Bay sediment acts as a source of NH4+-N; however, for NO3--N it is a sink. The diffusive fluxes of NH4+-N range from 2.70 to 4.72 mg·(m2·d)-1; and the diffusive fluxes of NO3--N range from -1.61 to -0.62 mg·(m2·d)-1. Nitrogen is mainly present in the form of ammonium nitrogen in the sediment of Xiangxi Bay. The ρ(NH4+-N) in the sediment ranges from 69.97-1185.97 mg·kg-1, ρ(NO3--N) ranges from 2.78-38.17 mg·kg-1, and the ρ(NH4+-N) in sediments in the surface at 0-8 cm changes with the same trend.
Collapse
Affiliation(s)
- Xin Li
- College of Hydraulic and Environmental Engineering, Three Gorges University, Yichang 443002, China
| | - Lin-Xu Song
- College of Hydraulic and Environmental Engineering, Three Gorges University, Yichang 443002, China
| | - Dao-Bin Ji
- College of Hydraulic and Environmental Engineering, Three Gorges University, Yichang 443002, China
| | - De-Fu Liu
- Hubei Key Laboratory of Ecological Restoration of River-lakes and Algal Utilization, School of Civil Engineering, Architecture and Environment, Hubei University of Technology, Wuhan 430068, China
| | - Qing-Qing Su
- College of Hydraulic and Environmental Engineering, Three Gorges University, Yichang 443002, China
| | - Lin-Peng Lü
- College of Hydraulic and Environmental Engineering, Three Gorges University, Yichang 443002, China
| | - Xiong Wang
- College of Hydraulic and Environmental Engineering, Three Gorges University, Yichang 443002, China
| | - Ya-Nan Huang
- College of Hydraulic and Environmental Engineering, Three Gorges University, Yichang 443002, China
| | - Qing Wu
- College of Hydraulic and Environmental Engineering, Three Gorges University, Yichang 443002, China
| |
Collapse
|
15
|
Yu YM, Huang YN, Deng J. Catalytic Asymmetric Chlorocyclization of 2-Vinylphenylcarbamates for Synthesis of 1,4-Dihydro-2H-3,1-benzoxazin-2-one Derivatives. Org Lett 2017; 19:1224-1227. [DOI: 10.1021/acs.orglett.7b00272] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Affiliation(s)
- Yan-Min Yu
- School of Pharmaceutical Science and Technology, Key Laboratory for Modern Drug Delivery & High-Efficiency, Tianjin University, Tianjin 300072, China
| | - Ya-Nan Huang
- School of Pharmaceutical Science and Technology, Key Laboratory for Modern Drug Delivery & High-Efficiency, Tianjin University, Tianjin 300072, China
| | - Jun Deng
- School of Pharmaceutical Science and Technology, Key Laboratory for Modern Drug Delivery & High-Efficiency, Tianjin University, Tianjin 300072, China
- School
of Pharmaceutical Sciences and Innovative Drug Research Centre, Chongqing University, 55 Daxuecheng South Road, Shapingba, Chongqing 401331, China
| |
Collapse
|
16
|
Abstract
A SO42−/TiO2–ZnAl2O4 composite catalyst with superior stability and acidic properties was synthesized and applied in esterification.
Collapse
Affiliation(s)
- An-Qi Wang
- Faculty of Materials Science and Chemistry
- Engineering Research Center of Nano-Geomaterials of Ministry of Education
- China University of Geosciences
- Wuhan 430074
- China
| | - Jun-Xia Wang
- Faculty of Materials Science and Chemistry
- Engineering Research Center of Nano-Geomaterials of Ministry of Education
- China University of Geosciences
- Wuhan 430074
- China
| | - Hui Wang
- Faculty of Materials Science and Chemistry
- Engineering Research Center of Nano-Geomaterials of Ministry of Education
- China University of Geosciences
- Wuhan 430074
- China
| | - Ya-Nan Huang
- Faculty of Materials Science and Chemistry
- Engineering Research Center of Nano-Geomaterials of Ministry of Education
- China University of Geosciences
- Wuhan 430074
- China
| | - Ming-Liang Xu
- Faculty of Materials Science and Chemistry
- Engineering Research Center of Nano-Geomaterials of Ministry of Education
- China University of Geosciences
- Wuhan 430074
- China
| | - Xiu-Ling Wu
- Faculty of Materials Science and Chemistry
- Engineering Research Center of Nano-Geomaterials of Ministry of Education
- China University of Geosciences
- Wuhan 430074
- China
| |
Collapse
|
17
|
Huang YN, Wang J, Chen BJ, Jiang QY, Guo YF, Lan GQ, Jiang HS. Gene expression and enzyme activity of lipoprotein lipase correlate with intramuscular fat content in Guangxi san-huang and Arbor Acres chickens. Genet Mol Res 2016; 15:gmr7414. [PMID: 27323106 DOI: 10.4238/gmr.15027414] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
Lipoprotein lipase (LPL) is a key enzyme in lipid metabolism. This study investigated LPL gene expression, LPL enzyme activity, and the correlation of each with intramuscular fat (IMF) in Chinese Guangxi san-huang (GXSH) and Arbor Acres (AA) chickens. The results showed that age and breed had significant effects on LPL expression and enzyme activity. Correlation analyses showed significant positive correlations between LPL expression levels and IMF contents in the breast and thigh tissues of both GXSH (r = 0.712, P = 0.001; r = 0.792, P < 0.001, respectively) and AA (r = 0.644, P < 0.001; r = 0.545, P < 0.001, respectively) chickens. The results also indicated a significant positive correlation between LPL enzyme activity and IMF contents in the breast and thigh tissues of both GXSH (r = 0.615, P = 0.001; r = 0.685, P < 0.001, respectively) and AA (r = 0.600, P = 0.001; r = 0.528, P = 0.003, respectively) chickens. The results indicated that the LPL gene was significantly correlated with IMF in these two breeds. The results presented here could contribute to knowledge of LPL mRNA developmental expression patterns and enzyme activity, and it could facilitate further research on the molecular mechanisms underlying IMF deposition in chickens.
Collapse
Affiliation(s)
- Y N Huang
- College of Animal Science and Technology, Guangxi University, Nanning, China
| | - J Wang
- College of Animal Science and Technology, Guangxi University, Nanning, China
| | - B J Chen
- College of Animal Science and Technology, Guangxi University, Nanning, China
| | - Q Y Jiang
- College of Animal Science and Technology, Guangxi University, Nanning, China
| | - Y F Guo
- College of Animal Science and Technology, Guangxi University, Nanning, China
| | - G Q Lan
- College of Animal Science and Technology, Guangxi University, Nanning, China
| | - H S Jiang
- College of Animal Science and Technology, Guangxi University, Nanning, China
| |
Collapse
|
18
|
Deng QQ, Tang J, Chen C, Markus H, Huang YN, Zhao H, Ratanakorn D, Wong KSL, Fu JH. The curative effect comparison of two kinds of therapeutic regimens on decreasing the relative intensity of microembolic signal in CLAIR trial. J Neurol Sci 2016; 367:18-21. [PMID: 27423556 DOI: 10.1016/j.jns.2016.05.042] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2016] [Revised: 04/26/2016] [Accepted: 05/20/2016] [Indexed: 10/21/2022]
Abstract
BACKGROUND Microembolic signals (MESs) are direct markers of unstable large artery atherosclerotic plaques. In a previous study, we found that the number of MESs is associated with stroke recurrence and that clopidogrel plus aspirin more effectively reduce the number of MESs than does aspirin alone. Stroke recurrence is associated with not only the number of MESs but also the size of the MES, which can theoretically be estimated by monitoring the MES intensity via transcranial doppler (TCD). Thus, we compared the effects of clopidogrel and aspirin with aspirin alone on MES intensity using TCD. METHODS We recruited 100 patients who experienced acute ischemic stroke or transient ischemic attack (TIA) within 7days of symptom onset. All patients also had large artery stenosis in the cerebral or carotid arteries and the presence of MES as revealed by TCD. The patients were randomized to receive either aspirin or clopidogrel and aspirin for 7days. MES monitoring was performed on days 2 and 7. RESULTS Intent-to-treat (ITT) analysis (46 patients in the dual therapy group, 52 patients in the monotherapy group) and per-protocol (PP) analysis (25 patients in the dual therapy group, 31 patients in the monotherapy group) were performed on 98 patients. The primary finding was that the MES intensity was dramatically reduced in the dual therapy group. ITT analysis of the dual therapy group revealed that the MES intensity was 8.04 (0-16) dB before treatment, 0.00 (0-17) dB on day 2, and 0.00 (0-12) dB on day 7 (P=0.000). In the monotherapy group, the MES intensity was 9.00 (0-20) dB before treatment, 8.25 (0-17) dB on day 2, and 7.0 (0-18) dB on day 7 (P=0.577). PP analysis revealed similar results. No severe hemorrhagic complications were detected. The two patients in this study who experienced stroke recurrence were in the monotherapy group. CONCLUSIONS Clopidogrel and aspirin more effectively decrease the MES intensity than aspirin alone in patients with large artery stenotic minor stroke or TIA.
Collapse
Affiliation(s)
- Q Q Deng
- Department of Neurology, Jing'an District Central Hospital of Shanghai, Shanghai, China.
| | - J Tang
- Department of Neurology, Huashan Hospital affiliated to Fudan University, Shanghai, China.
| | - C Chen
- Department of Pharmacology, National University of Singapore, Singapore.
| | - H Markus
- Department of Clinical Neuroscience, St George's, University of London, London, UK.
| | - Y N Huang
- Department of Neurology, Peking University First Hospital, Beijing, China.
| | - H Zhao
- Department of Neurology, The First Affiliated Hospital of Wenzhou Medical College, Wenzhou, China.
| | | | - K S L Wong
- Department of Medicine and Therapeutics, The Chinese University of Hong Kong, Prince of Wales Hospital, Shatin, Hong Kong SAR, China.
| | - J H Fu
- Department of Neurology, Huashan Hospital affiliated to Fudan University, Shanghai, China; Department of Neurology, Pudong hospital, Shanghai, China.
| |
Collapse
|
19
|
Affiliation(s)
- Ya-Nan Huang
- School of Pharmaceutical Science and Technology, Key Laboratory for Modern Drug Delivery & High-Efficiency, Tianjin University, Tianjin, 300072 P. R. China
| | - Yin-Long Li
- School of Pharmaceutical Science and Technology, Key Laboratory for Modern Drug Delivery & High-Efficiency, Tianjin University, Tianjin, 300072 P. R. China
| | - Jian Li
- School of Pharmaceutical Science and Technology, Key Laboratory for Modern Drug Delivery & High-Efficiency, Tianjin University, Tianjin, 300072 P. R. China
| | - Jun Deng
- School of Pharmaceutical Science and Technology, Key Laboratory for Modern Drug Delivery & High-Efficiency, Tianjin University, Tianjin, 300072 P. R. China
| |
Collapse
|
20
|
Wang L, Yang SY, Guo MY, Huang YN, Sentenac H, Véry AA, Su YH. The S1-S2 linker determines the distinct pH sensitivity between ZmK2.1 and KAT1. Plant J 2016; 85:675-85. [PMID: 26846460 DOI: 10.1111/tpj.13134] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/29/2015] [Revised: 01/19/2016] [Accepted: 01/25/2016] [Indexed: 05/12/2023]
Abstract
Efficient stomatal opening requires activation of KAT-type K(+) channels, which mediate K(+) influx into guard cells. Most KAT-type channels are functionally facilitated by extracellular acidification. However, despite sequence and structural homologies, the maize counterpart of Arabidopsis KAT1 (ZmK2.1) is resistant to pH activation. To understand the structural determinant that results in the differential pH activation of these counterparts, we analysed chimeric channels and channels with point mutations for ZmK2.1 and its closest Arabidopsis homologue KAT1. Exchange of the S1-S2 linkers altered the pH sensitivity between the two channels, suggesting that the S1-S2 linker is essentially involved in the pH sensitivity. The effects of D92 mutation within the linker motif together with substitution of the first half of the linker largely resemble the effects of substitution of the complete linker. Topological modelling predicts that one of the two cysteines located on the outer face section of the S5 domain may serve as a potential titratable group that interacts with the S1-S2 linker. The difference between ZmK2.1 and KAT1 is predicted to be the result of the distance of the stabilized linkers from the titratable group. In KAT1, residue K85 within the linker forms a hydrogen bond with C211 that enables the pH activation; conversely, the linker of ZmK2.1 is distantly located and thus does not interact with the equivalent titration group (C208). Thus, in addition to the known structural contributors to the proton activation of KAT channels, we have uncovered a previously unidentified component that is strongly involved in this complex proton activation network.
Collapse
Affiliation(s)
- Li Wang
- State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing, 210008, China
- University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Shun-Ying Yang
- State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing, 210008, China
| | - Man-Yuan Guo
- State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing, 210008, China
- University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Ya-Nan Huang
- State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing, 210008, China
- University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Hervé Sentenac
- Biochimie & Physiologie Moléculaire des Plantes, UMR 5004, CNRS/386 INRA/SupAgro Montpellier/Université Montpellier, 34060, Montpellier Cedex 2, France
| | - Anne-Aliénor Véry
- Biochimie & Physiologie Moléculaire des Plantes, UMR 5004, CNRS/386 INRA/SupAgro Montpellier/Université Montpellier, 34060, Montpellier Cedex 2, France
| | - Yan-Hua Su
- State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing, 210008, China
| |
Collapse
|
21
|
Li J, Li YL, Jin N, Ma AL, Huang YN, Deng J. A Practical Synthesis of α-Fluoroketones in Aqueous Media by Decarboxylative Fluorination of β-Ketoacids. Adv Synth Catal 2015. [DOI: 10.1002/adsc.201500282] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
|
22
|
Huang YN, Li J, Jiang QY, Shen XS, Yan XY, Tang YB, Huang J, Guo YF, Lan GQ, Jiang HS. Complete mitochondrial genome of the Cyclemys dentata and phylogenetic analysis of the major family Geoemydidae. Genet Mol Res 2015; 14:3234-43. [PMID: 25966089 DOI: 10.4238/2015.april.13.2] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
In the present study, the complete mitochondrial (mt) genome of Cyclemys dentata was determined using PCR reactions. The structural organization and gene order of C. dentata were equivalent to those of most other vertebrates. The mt genome was 16,489 bp in length, has rich A+T content, consisting of 13 protein-coding genes, 2 ribosomal RNA genes, 22 transfer RNA genes, and a control region (D-loop). All protein-coding genes started with ATG, many genes have complete stop codons, except ND2, COX3, ND3, and cyt-b genes had incomplete stop codons of T. The light-strand replication origin (OL) of C. dentata might fold into a stable stem-loop secondary structure, and its loop had 2 nt less than that of the Cyclemys atripons OL sequence. The D-Loop of C. dentata contained a central domain (CD), 2 extended termination associated sequences (ETAS1, ETAS2) and 3 conserved sequence blocks (CSB1, CSB2, CSB3). The average length of 20 turtles' mt genomes was 16,692.5 bp, including 34.1% A, 27.0% T, 26.0% C and 12.9% G. The C. dentata mitochondrial genome could provide useful data for further studies on phylogenetics and conservation genetics of this species. The phylogenetic relationships of the family Geoemydidae were analyzed by maximum-likelihood (ML) and neighbor-joining (NJ) based on concatenated sequences of 13 protein-coding genes from 20 turtle species. The ML and NJ trees had homologous topologies. The results support the existing classification of the genera of Geoemydidae, that C. dentata was a sister species of C. atripons, Pyxidea nested in Cuora, and Chinemys was synonymous with Mauremys.
Collapse
Affiliation(s)
- Y N Huang
- College of Animal Science and Technology, Guangxi University, Nanning, China
| | - J Li
- College of Animal Science and Technology, Guangxi University, Nanning, China
| | - Q Y Jiang
- College of Animal Science and Technology, Guangxi University, Nanning, China
| | - X S Shen
- College of Animal Science and Technology, Guangxi University, Nanning, China
| | - X Y Yan
- College of Animal Science and Technology, Guangxi University, Nanning, China
| | - Y B Tang
- College of Animal Science and Technology, Guangxi University, Nanning, China
| | - J Huang
- College of Animal Science and Technology, Guangxi University, Nanning, China
| | - Y F Guo
- College of Animal Science and Technology, Guangxi University, Nanning, China
| | - G Q Lan
- College of Animal Science and Technology, Guangxi University, Nanning, China
| | - H S Jiang
- College of Animal Science and Technology, Guangxi University, Nanning, China
| |
Collapse
|
23
|
Affiliation(s)
- Yin-Long Li
- School of Pharmaceutical Science and Technology, Key Laboratory for Modern Drug Delivery & High-Efficiency, and ‡Collaborative Innovation Center of Chemical Science and Engineering, Tianjin University, Tianjin 300072, People’s Republic of China
| | - Jian Li
- School of Pharmaceutical Science and Technology, Key Laboratory for Modern Drug Delivery & High-Efficiency, and ‡Collaborative Innovation Center of Chemical Science and Engineering, Tianjin University, Tianjin 300072, People’s Republic of China
| | - Ai-Lun Ma
- School of Pharmaceutical Science and Technology, Key Laboratory for Modern Drug Delivery & High-Efficiency, and ‡Collaborative Innovation Center of Chemical Science and Engineering, Tianjin University, Tianjin 300072, People’s Republic of China
| | - Ya-Nan Huang
- School of Pharmaceutical Science and Technology, Key Laboratory for Modern Drug Delivery & High-Efficiency, and ‡Collaborative Innovation Center of Chemical Science and Engineering, Tianjin University, Tianjin 300072, People’s Republic of China
| | - Jun Deng
- School of Pharmaceutical Science and Technology, Key Laboratory for Modern Drug Delivery & High-Efficiency, and ‡Collaborative Innovation Center of Chemical Science and Engineering, Tianjin University, Tianjin 300072, People’s Republic of China
| |
Collapse
|
24
|
Abstract
We studied 590 asymptomatic villagers aged > or =40 years in Liangbei County in central rural China and found 41 subjects (prevalence 6.9%) with intracranial atherosclerosis. In a multivariate analysis, the significant risk factors for intracranial stenosis were hypertension (OR 2.53; 95% CI 1.12 to 5.72), glycosuria (OR 3; 1.19 to 7.97), heart disease (OR 4; 1.39 to 11.6), and family history of stroke (OR 5.2; 1.38 to 20). Intracranial atherosclerosis is not uncommon among asymptomatic Chinese subjects.
Collapse
Affiliation(s)
- K S Wong
- Department of Medicine & Therapeutics, The Chinese University of Hong Kong, Prince of Wales Hospital, Shatin, Hong Kong.
| | | | | | | | | | | | | | | |
Collapse
|
25
|
Liao C, Wu JY, Xu ZP, Li Y, Yang X, Chen JS, Tang XW, Gu SL, Huang YN, Tang PH, Tsang KS. Indiscernible benefit of high-resolution HLA typing in improving long-term clinical outcome of unrelated umbilical cord blood transplant. Bone Marrow Transplant 2007; 40:201-8. [PMID: 17530001 DOI: 10.1038/sj.bmt.1705711] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
The success of allogeneic hematopoietic stem cell transplantation depends in part on the accuracy of human leukocyte antigen (HLA) matching between the donor-recipient pair. The higher the number of matching HLA alleles, the smaller the chance that the transplant recipient will develop complications. Umbilical cord blood (UCB) transplantation was noted to result in a remarkably low frequency and severity of graft-versus-host disease (GvHD) and graft rejection compared to that in unrelated bone marrow transplant recipients. At present most banks match UCB donors for respective recipients by HLA-A, -B low-resolution typing and -DRB1 high-resolution typing. We retrospectively conducted high-resolution sequence-based HLA typing on DNA samples available from 65 Chinese UCB-recipient pairs typed previously by using low-resolution sequence-specific oligonucleotide probes and sequence-specific primers, and evaluated the clinical outcome. High-resolution typing revealed imperceptible HLA alleles that were hardly identified in low-resolution typing. Univariate analyses demonstrated no significant correlation between the extents of high-resolution HLA disparity with engraftment, graft failure, acute GvHD, transplant-related mortality and long-term 6-year overall survival. Data from the study suggest that high-resolution typing for HLA-A, -B and -DRB1 contributed no substantial improvement to UCB transplant outcome. Low-resolution typing appears to be amenable to matching UCB-recipient pairs without compromising the quality of transplant.
Collapse
Affiliation(s)
- C Liao
- Guangzhou Cord Blood Bank, Guangzhou Medical College, Guangzhou Maternal and Neonatal Hospital, Guangzhou, China.
| | | | | | | | | | | | | | | | | | | | | |
Collapse
|
26
|
Wu JY, Liao C, Xu ZP, Chen JS, Gu SL, Huang YN, Li Y, Tang XW, Yang X, Tang PH, Tsang KS. Banking and transplantation of umbilical cord blood in Guangzhou, China. Cytotherapy 2006; 8:488-97. [PMID: 17050254 DOI: 10.1080/14653240600920790] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Abstract
BACKGROUND Umbilical cord blood (UCB) is an alternative source of hematopoietic stem cells (HSC) for transplantation of patients with hematologic malignancies or hereditary diseases. METHODS We developed a provincial UCB bank in Guangzhou, China, using good manufacturing practices and standard operating procedures to address donor eligibility, collection, characterization, processing, storage and release from quarantine. The banking activities were analyzed. RESULTS From June 1998 to May 2005, 8623 UCB units of Han ethnic origin were collected; 4147 (48.1%) were stored, while 4476 (51.9%) were discarded as a result of pre-determined exclusion criteria. A median volume of 95.5 mL (range 60-227.7) and 1.2 x 10(9) (0.8-9.3) nucleated cells were collected. The cell viability was 97.8% (90-100%). The CD34+ cell count of 3691 (89.0%) UCB units was 5.2 x 10(6) (0.3-131.6) and clonogenic assays of 4036 (97.3%) UCB units demonstrated 9.8 x 10(5) (0.04-135.8) CFU-GM, 0.3 x 10(5) (0.0-18.6) CFU-GEMM and 8.8 x 10(5) (0.0-74.2) BFU-E. A total of 0.4% (15/3863) UCB derived from babies known to have health problems at age 6 months was discarded. Up to May 2005, 151 units were issued for transplantation to 127 patients [90 (70.9%) children and 37 (29.1%) adults]. The infused nucleated cells in unrelated single-unit recipients were 3.4 x 10(7)/kg (1.7-14.9) for adults (n=19) and 5.7 x 10(7)/kg (2.0-20.5) for children (n=71), respectively. The numbers of days for the engraftment of neutrophils among 65 children and 22 adults were 17 (7-41) and 20 (10-42), respectively. DISCUSSION Data of this study show that stringent procedures and comprehensive policies are requisite for pursuing the banking and release of quality UCB for successful transplantation.
Collapse
Affiliation(s)
- J Y Wu
- Guangzhou Cord Blood Bank, Guangzhou Maternal and Neonatal Hospital, Guangzhou, China
| | | | | | | | | | | | | | | | | | | | | |
Collapse
|
27
|
Li DZ, Liao C, Li J, Xie XM, Huang YN, Wu QC. Hemoglobin H hydrops fetalis syndrome resulting from the association of the - -SEA deletion and the alphaQuong Szealpha mutation in a Chinese woman. Eur J Haematol 2005; 75:259-61. [PMID: 16104884 DOI: 10.1111/j.1600-0609.2005.00493.x] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
A case with Hb H hydrops fetalis syndrome resulting from the association of the - -(SEA) deletion and the alpha(Quong Sze)alpha mutation is reported. This is the first description of Hb H hydrops associated with the Hb Quong Sze mutation.
Collapse
Affiliation(s)
- D Z Li
- Prenatal Diagnostic Center, Guangzhou Maternal & Neonatal Hospital, Guangzhou Medical College, Guangdong, China.
| | | | | | | | | | | |
Collapse
|
28
|
Abstract
We propose a dynamic structure of coupled dynamic molecular strings for supercooled small polar molecule liquids and accordingly we obtain the Hamiltonian of the rotational degrees of freedom of the system. From the Hamiltonian, the strongly correlated supercooled polar liquid state is renormalized to a normal superdipole liquid state. This scenario describes the following main features of the primary or alpha-relaxation dynamics in supercooled polar liquids: (1) the average relaxation time evolves from a high temperature Arrhenius to a low temperature non-Arrhenius or super-Arrhenius behavior; (2) the relaxation function crosses over from the high temperature exponential to low temperature nonexponential form; and (3) the temperature dependence of the relaxation strength shows non-Curie features. According to the present model, the crossover phenomena of the first two characteristics arise from the transition between the superdipole gas and the superdipole liquid. The model predictions are quantitatively compared with the experimental results of glycerol, a typical glass former.
Collapse
Affiliation(s)
- Y N Huang
- National Laboratory of Solid State Microstructures, Department of Physics, Nanjing University, Nanjing 210093, People's Republic of China.
| | | | | |
Collapse
|
29
|
Huang YN, Wang CJ, Ngai KL, Wang YN, Riande E. Modeling dynamically heterogeneous coupled relaxations. Phys Rev E Stat Nonlin Soft Matter Phys 2001; 64:041202. [PMID: 11690014 DOI: 10.1103/physreve.64.041202] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/14/1999] [Revised: 07/16/2001] [Indexed: 05/23/2023]
Abstract
A model describing dynamically heterogeneous relaxation in complex coupled systems is presented. The model predicts the splitting of a high-temperature single Debye relaxation to a low-temperature bimodal relaxation. The bimodal process shows a crossover from a Debye-type relaxation to an approximately stretched-exponential relaxation. Some general features of relaxation in complex systems emerge from the predictions of the model, and a comparison of the model with experiments is reported.
Collapse
Affiliation(s)
- Y N Huang
- Department of Physics, Nanjing University, Nanjing 210093, China
| | | | | | | | | |
Collapse
|
30
|
Abstract
In this paper, we study the characteristics of the Reynolds stress under a change of frame, as defined by the Euclidean group of transformation. We show that being subject to the dynamical processes induced from the mean Navier-Stokes equations, the invariance group of the fluctuating velocity and the Reynolds stress is no longer the Euclidean group of transformation, which is merely a kinematical aspect, but reduces to the extended Galilean group of transformation. As a consequence, in contrast to developing the constitutive equations for the Cauchy stress in continuum mechanics, wherein the principle of material frame-indifference is a guiding principle, the frame-dependent kinematical quantities, e.g., the mean spin tensor, may be allowed to play an effective role as the constitutive variable in turbulence modeling.
Collapse
Affiliation(s)
- Y N Huang
- Institute of Fluid Mechanics, University of Erlangen-Nuremberg, D-91058 Erlangen, Germany.
| | | |
Collapse
|
31
|
Wong KS, Huang YN, Gao S, Lam WW, Chan YL. Cerebrovascular disease among Chinese populations--recent epidemiological and neuroimaging studies. Hong Kong Med J 2001; 7:50-7. [PMID: 11406676] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/20/2023] Open
Abstract
Stroke mortality in individuals of Chinese descent has declined during the past decades, although the absolute number of patients with first-ever stroke is escalating. This review summarises recent epidemiological and imaging studies conducted among Chinese populations. Data indicating differences between Chinese and Caucasian ethnic groups in the pathophysiological mechanisms of stroke are highlighted, and the potential implications of these findings for prevention and management of stroke are discussed.
Collapse
Affiliation(s)
- K S Wong
- Division of Neurology, Department of Medicine and Therapeutics, The Chinese University of Hong Kong, Prince of Wales Hospital, Shatin, Hong Kong
| | | | | | | | | |
Collapse
|
32
|
Abstract
We studied 100 consecutive acute stroke patients in a Chinese population with transcranial Doppler and CT. Twenty patients had intracerebral hemorrhage and 14 patients did not have adequate temporal windows for transcranial Doppler examination. Among the remaining 66 patients, 22 patients (33%) had intracranial occlusive diseases and 3 (6%) had extracranial carotid stenosis. Our data showed that intracranial occlusive disease is the most commonly found vascular lesion in our acute stroke patients.
Collapse
Affiliation(s)
- K S Wong
- Department of Medicine, Chinese University of Hong Kong, Shatin
| | | | | | | | | | | |
Collapse
|
33
|
Abstract
We studied 96 Chinese patients with TIAs using transcranial Doppler and duplex ultrasonography. We found intracranial stenosis or occlusion in 51% of cases and extracranial disease in 19% of cases. The most common intracranial lesion was stenosis of the terminal internal carotid artery or proximal middle cerebral artery, whereas the most common extracranial lesion was stenosis of the carotid bifurcation.
Collapse
Affiliation(s)
- Y N Huang
- Department of Neurology, Peking Union Medical College Hospital, Beijing, China
| | | | | | | | | | | | | |
Collapse
|
34
|
Wong KS, Lam WW, Liang E, Huang YN, Chan YL, Kay R. Variability of magnetic resonance angiography and computed tomography angiography in grading middle cerebral artery stenosis. Stroke 1996; 27:1084-7. [PMID: 8650718 DOI: 10.1161/01.str.27.6.1084] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
BACKGROUND AND PURPOSE Magnetic resonance angiography and computed tomography angiography are new, noninvasive methods to provide images of the cerebral vasculature. The reliability of magnetic resonance angiography and computed tomography angiography when used to grade middle cerebral artery stenosis remains to be established. We sought to study the interobserver and intraobserver variabilities of magnetic resonance angiography and computed tomography angiography in grading middle cerebral artery stenosis. METHODS A total of 50 middle cerebral arteries in 25 patients were studied with magnetic resonance angiography and computed tomography angiography. All patients had a history of ischemic stroke. The films were read independently by two observers on separate occasions. Films were shown again to the same observer 4 weeks after the first reading. The degree of middle cerebral artery stenosis was categorized into four grades: normal/mild, moderate, severe, and occluded. The interobserver and intraobserver variabilities were calculated by the kappa statistic method. RESULTS Interobserver variability for grading middle cerebral artery stenosis was good (kappa = 0.78) for magnetic resonance angiography and moderate (kappa = 0.51) for computed tomography angiography. There was perfect agreement between two observers in 86% of the vessels shown in magnetic resonance angiography and in 76% of the vessels shown in computed tomography angiography. Intraobserver variability for both imaging methods was good, with the kappa value in the range of 0.70 to 0.76. CONCLUSIONS Our results suggest that according to our protocol, magnetic resonance angiography is more reliable than computed tomography angiography in grading middle cerebral artery stenosis.
Collapse
Affiliation(s)
- K S Wong
- Department of Medicine, Prince of Wales Hospital, Chinese University of Hong Kong, Shatin, Hong Kong.
| | | | | | | | | | | |
Collapse
|
35
|
Abstract
There has been no report on the use of spiral computed tomography angiography (CTA) in the investigation of intracranial cerebral artery stenosis. A prospective pilot study was conducted to investigate the feasibility of CTA in the diagnosis of intracranial occlusive disease and its correlation with transcranial Doppler. With transcranial Doppler, 10 patients with acute ischaemic stroke with middle cerebral artery stenosis or occlusion were identified. There were seven middle cerebral artery stenoses and five middle cerebral artery occlusions. The CTA confirmed all diagnoses by transcranial Doppler except in one patient with middle cerebral artery occlusion in whom the embolus had probably propagated. The results showed that CTA is feasible and potentially useful in the diagnosis of middle cerebral artery occlusive disease. Further studies are required to assess its validity, sensitivity, and specificity in the diagnosis of middle cerebral artery occlusive disease.
Collapse
Affiliation(s)
- K S Wong
- Department of Medicine, Chinese University of Hong Kong, Prince of Wales Hospital, Shatin, Hong Kong
| | | | | | | | | |
Collapse
|
36
|
Huang YN, Wang YN, Zhao ZX. Internal friction and ultrasonic attenuation related to carriers in high-Tc superconductors. Phys Rev B Condens Matter 1994; 49:1320-1326. [PMID: 10010442 DOI: 10.1103/physrevb.49.1320] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
|
37
|
Huang YN, Wang YN, Shen HM. Internal friction and dielectric loss related to domain walls. Phys Rev B Condens Matter 1992; 46:3290-3295. [PMID: 10004044 DOI: 10.1103/physrevb.46.3290] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
|
38
|
Hallam TG, Huang YN. On the dynamics of a toxicant-individual system. J Theor Biol 1989; 141:65-72. [PMID: 2634161 DOI: 10.1016/s0022-5193(89)80008-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
The dynamics of a toxicant-individual model where the individual is represented by von Bertalanffy dynamics and the uptake model component is one developed by Barber, Suarez & Lassiter is discussed. A sufficient condition for the death of an individual subjected to chemical stress is found. Another possible behavior of the system is an oscillatory mode of individual size and internal chemical concentration determined by a limit cycle. These fluctuations are a consequence of formulations of growth, maintenance, and the dose-response functions in the model system.
Collapse
Affiliation(s)
- T G Hallam
- Department of Mathematics, University of Tennessee, Knoxville 37996-1300
| | | |
Collapse
|
39
|
Tang XF, Huang YN. P14 of somatosensory evoked potentials following median nerve stimulation in 5 patients with neurological lesions at various levels. Chin Med J (Engl) 1988; 101:98-104. [PMID: 3136989] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023] Open
|
40
|
Huang YN. [Finding of coronavirus particles in the feces of patients with diarrhea]. Zhonghua Liu Xing Bing Xue Za Zhi 1987; 8:25-7. [PMID: 3621315] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
|