LIVIVO - The Search Portal for Life Sciences

zur deutschen Oberfläche wechseln
Advanced search

Search results

Result 1 - 10 of total 88

Search options

  1. Book ; Online ; E-Book: Nonclassical ion channels in the nervous system

    Tian-le, Xu / Wu, Long-Jun

    (Methods in signal transduction series)

    2021  

    Abstract: Intro -- Half Title -- Series Page -- Title Page -- Copyright Page -- Contents -- Preface -- Editors -- Contributors -- 1. Endogenous Activation and Neurophysiological Functions of Acid-Sensing Ion Channels -- 1.1 Introduction -- 1.2 Endogenous ... ...

    Author's details edited by Tian-le Xu and Long-Jun Wu
    Series title Methods in signal transduction series
    Abstract Intro -- Half Title -- Series Page -- Title Page -- Copyright Page -- Contents -- Preface -- Editors -- Contributors -- 1. Endogenous Activation and Neurophysiological Functions of Acid-Sensing Ion Channels -- 1.1 Introduction -- 1.2 Endogenous Conditions That May Activate ASICs -- 1.2.1 Metabolic Production of Protons -- 1.2.1.1 Carbon Dioxide -- 1.2.1.2 Lactate -- 1.2.2 Acidification Niche and Proton Generators -- 1.2.2.1 Na+/H+ Exchangers (NHEs) -- 1.2.2.2 Hydrogen Voltage-Gated Channel 1 (Hv1) -- 1.2.2.3 Carbonic Anhydrases (CAs) -- 1.3 ASICs and Neurophysiological Functions -- 1.3.1 Synaptic Development -- 1.3.2 Synaptic Plasticity -- 1.3.3 Regional Specific Functions of ASICs -- 1.3.3.1 Amygdala -- 1.3.3.2 Retina -- 1.3.3.3 Dorsal Root Ganglia (DRG) -- 1.4 Summary and Outlook -- Acknowledgements -- References -- 2. Acid-Sensing Ion Channels and Synaptic Plasticity: A Revisit -- 2.1 Introduction -- 2.2 Protons and ASICs in Synaptic Transmission -- 2.2.1 Protons Act as a Neurotransmitter in Synaptic Signaling -- 2.2.2 Modulation of Synaptic Transmission by ASICs -- 2.3 ASIC1a in Synaptic Plasticity -- 2.3.1 ASIC1a in LTP -- 2.3.1.1 Hippocampus -- 2.3.1.2 Amygdala -- 2.3.1.3 ACC -- 2.3.2 ASIC1a in LTD -- 2.3.2.1 Hippocampus -- 2.3.2.2 Insular Cortex -- 2.4 ASICs in Synaptic Remodeling -- 2.5 Summary and Future Perspectives -- Acknowledgements -- References -- 3. Trimeric Scaffold Ligand-Gated Ion Channels -- 3.1 An Introduction of Trimeric Scaffold of Ligand-Gated Ion Channels (TS-LGICs) -- 3.2 Subunit Stoichiometry and Single Subunit Architecture of P2X Receptors and ASIC Channels -- 3.3 Ion Permeation Pathway of P2X Receptors and ASIC Channels -- 3.4 Ligand Recognitions of P2X Receptors and ASIC Channels -- 3.5 Coordinated Allostery During Channel Activation of P2X Receptors and ASIC Channels.
    Keywords Electronic books
    Language English
    Size 1 Online-Ressource (xiv, 413 Seiten), Illustrationen
    Publisher CRC Press
    Publishing place Boca Raton
    Publishing country United States
    Document type Book ; Online ; E-Book
    Remark Zugriff für angemeldete ZB MED-Nutzerinnen und -Nutzer
    HBZ-ID HT021025880
    ISBN 978-1-00-040374-9 ; 9780367623951 ; 9781003109266 ; 1-00-040374-2 ; 0367623951 ; 1003109268
    Database ZB MED Catalogue: Medicine, Health, Nutrition, Environment, Agriculture

    Kategorien

  2. Article ; Online: Carbon Dioxide Emission Reduction-Oriented Optimal Control of Traffic Signals in Mixed Traffic Flow Based on Deep Reinforcement Learning

    Zhaowei Wang / Le Xu / Jianxiao Ma

    Sustainability, Vol 15, Iss 24, p

    2023  Volume 16564

    Abstract: To alleviate intersection traffic congestion and reduce carbon emissions at intersections, research on exploiting reinforcement learning for intersection signal control has become a frontier topic in the field of intelligent transportation. This study ... ...

    Abstract To alleviate intersection traffic congestion and reduce carbon emissions at intersections, research on exploiting reinforcement learning for intersection signal control has become a frontier topic in the field of intelligent transportation. This study utilizes a deep reinforcement learning algorithm based on the D3QN (dueling double deep Q network) to achieve adaptive control of signal timings. Under a mixed traffic environment with connected and automated vehicles (CAVs) and human-driven vehicles (HDVs), this study constructs a reward function (Reward—CO 2 Reduction) to minimize vehicle waiting time and carbon dioxide emissions at the intersection. Additionally, to account for the spatiotemporal distribution characteristics of traffic flow, an adaptive-phase action space and a fixed-phase action space are designed to optimize action selections. The proposed algorithm is validated in a SUMO simulation with different traffic volumes and CAV penetration rates. The experimental results are compared with other control strategies like Webster’s method (fixed-time control). The analysis shows that the proposed model can effectively reduce carbon dioxide emissions when the traffic volume is low or medium. As the penetration rate of CAVs increases, the average carbon dioxide emissions and waiting time can be further reduced with the proposed model. The significance of this study lies in its dual achievement: by presenting a flexible strategy that not only reduces the environmental impact by lowering carbon dioxide emissions but also enhances traffic efficiency, it provides a tangible example of the advancement of green intelligent transportation systems.
    Keywords intersection signal control ; mixed traffic environment ; deep reinforcement learning ; CO 2 reduction ; Environmental effects of industries and plants ; TD194-195 ; Renewable energy sources ; TJ807-830 ; Environmental sciences ; GE1-350
    Subject code 629
    Language English
    Publishing date 2023-12-01T00:00:00Z
    Publisher MDPI AG
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

    More links

    Kategorien

  3. Article ; Online: Structural Characteristics and Antioxidant Mechanism of Donkey-Hide Gelatin Peptides by Molecular Dynamics Simulation

    Rong Liang / Le Xu / Chen Fan / Lele Cao / Xingfeng Guo

    Molecules, Vol 28, Iss 24, p

    2023  Volume 7975

    Abstract: This study aimed to explore the structural characteristics and antioxidant mechanism of donkey-hide gelatin peptides. After hydrolysis and ultrafiltration treatment, five gelatin peptides with different molecular weights (MWs) were obtained. Amino acid ... ...

    Abstract This study aimed to explore the structural characteristics and antioxidant mechanism of donkey-hide gelatin peptides. After hydrolysis and ultrafiltration treatment, five gelatin peptides with different molecular weights (MWs) were obtained. Amino acid analysis showed that gelatin peptides with different MWs contained a large number of amino acids, including G, P, E, N, A, and R, and differences were noted in the content of various amino acids. Fourier transform infrared spectroscopy and circular dichroism revealed that these gelatin peptides differed in terms of the peak strength of functional groups and number of secondary structures. Moreover, 26 pentapeptides/hexapeptides were identified. Among them, we investigated by molecular docking how PGPAP, which has the best antioxidant activity, may interact with the Keap1 protein. The results showed that the PGPAP-Keap1 complex had a stable conformation, and Arg415, Gly462, Phe478, and Tyr572 were the key residues involved in the binding of the peptide PGPAP to Keap1. Our results demonstrated that PGPAP could serve as a bioactive peptide with antioxidant activity.
    Keywords gelatin peptides ; antioxidant activity ; structural characteristics ; Keap1 protein ; molecular dynamics simulations ; Organic chemistry ; QD241-441
    Subject code 540
    Language English
    Publishing date 2023-12-01T00:00:00Z
    Publisher MDPI AG
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

    More links

    Kategorien

  4. Article ; Online: Overexpression of retinoid X receptor beta provides protection against oxidized low-density lipoprotein-induced inflammation via regulating PGC1α-dependent mitochondrial homeostasis in endothelial cells.

    Zeng, Yi / Yan Wang, Chun / Xu, Jin / Le Xu, Xiao

    Biochemical pharmacology

    2021  Volume 188, Page(s) 114559

    Abstract: Retinoid X receptor beta (RXRβ) has been poorly studied in atherosclerosis. The aim of the present study is to explore the function of RXRβ in oxidized low density lipoprotein (ox-LDL)-induced inflammation in endothelial cells and the underlying ... ...

    Abstract Retinoid X receptor beta (RXRβ) has been poorly studied in atherosclerosis. The aim of the present study is to explore the function of RXRβ in oxidized low density lipoprotein (ox-LDL)-induced inflammation in endothelial cells and the underlying mechanism. The protein expression of RXRβ in the aorta of atherosclerotic mice was detected. A lentivirus vector for RXRβ overexpression and RNA interference for RXRβ downregulation were constructed and transfected into human aortic endothelial cells (HAECs). The results showed that RXRβ protein expression was downregulated in aorta of high fat diet (HFD)-fed LDLr
    MeSH term(s) Animals ; Cell Line ; DNA-Binding Proteins/biosynthesis ; DNA-Binding Proteins/genetics ; Diet, High-Fat/adverse effects ; Endothelial Cells/drug effects ; Endothelial Cells/metabolism ; Gene Expression Regulation ; Homeostasis/drug effects ; Homeostasis/physiology ; Humans ; Inflammation Mediators/antagonists & inhibitors ; Inflammation Mediators/metabolism ; Lipoproteins, LDL/toxicity ; Male ; Mice ; Mice, Knockout ; Mitochondria/drug effects ; Mitochondria/genetics ; Mitochondria/metabolism ; Peroxisome Proliferator-Activated Receptor Gamma Coactivator 1-alpha/biosynthesis ; Peroxisome Proliferator-Activated Receptor Gamma Coactivator 1-alpha/genetics
    Chemical Substances DNA-Binding Proteins ; Inflammation Mediators ; Lipoproteins, LDL ; Peroxisome Proliferator-Activated Receptor Gamma Coactivator 1-alpha ; Ppargc1a protein, mouse ; Rxrb protein, mouse ; oxidized low density lipoprotein
    Language English
    Publishing date 2021-04-17
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 208787-x
    ISSN 1873-2968 ; 0006-2952
    ISSN (online) 1873-2968
    ISSN 0006-2952
    DOI 10.1016/j.bcp.2021.114559
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  5. Article ; Online: Improved Seagull Optimization Algorithm Combined with an Unequal Division Method to Solve Dynamic Optimization Problems

    Le Xu / Yuanbin Mo / Yanyue Lu / Jiang Li

    Processes, Vol 9, Iss 1037, p

    2021  Volume 1037

    Abstract: The numerical solution of the dynamic optimization problem is often sought for chemical processes, but the discretization of control variables is a difficult problem. Firstly, based on the analysis of the seagull optimization algorithm, this paper ... ...

    Abstract The numerical solution of the dynamic optimization problem is often sought for chemical processes, but the discretization of control variables is a difficult problem. Firstly, based on the analysis of the seagull optimization algorithm, this paper introduces the cognitive part in the process of a seagull’s attack behavior to make the group approach the best position. Secondly, the algorithm adds the mechanism of natural selection, where the fitness value is used to sort the population, and the best half is used to replace the worst half, so as to find out the optimal solution. Finally, the improved seagull optimization algorithm (ISOA) is combined with the unequal division method to solve dynamic optimization problems. The feasibility of the method is verified by three practical examples of dynamic optimization in chemical industry.
    Keywords chemical processes ; chemical dynamic optimization problem ; numerical solution ; seagull optimization algorithm ; Chemical technology ; TP1-1185 ; Chemistry ; QD1-999
    Subject code 510
    Language English
    Publishing date 2021-06-01T00:00:00Z
    Publisher MDPI AG
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

    More links

    Kategorien

  6. Article ; Online: CdS Deposited In Situ on g-C 3 N 4 via a Modified Chemical Bath Deposition Method to Improve Photocatalytic Hydrogen Production

    Ligang Ma / Wenjun Jiang / Chao Lin / Le Xu / Tianyu Zhu / Xiaoqian Ai

    Molecules, Vol 28, Iss 23, p

    2023  Volume 7846

    Abstract: Ultra-thin two-dimensional materials are attracting widespread interest due to their excellent properties, and they are becoming ideal candidates for a variety of energy and environmental photocatalytic applications. Herein, CdS nanorods are successfully ...

    Abstract Ultra-thin two-dimensional materials are attracting widespread interest due to their excellent properties, and they are becoming ideal candidates for a variety of energy and environmental photocatalytic applications. Herein, CdS nanorods are successfully grown in situ between a monolayer of g-C 3 N 4 using a chemical water bath method. Continuous ultrasound is introduced during the preparation process, which effectively prevents the accumulation of a g-C 3 N 4 layer. The g-C 3 N 4 @CdS nanocomposite exhibits significantly enhanced photocatalytic activity for hydrogen production under visible-light irradiation, which is attributed to a well-matched band structure and an intimate van der Waals heterojunction interface. The mechanism of photocatalytic hydrogen production is discussed in detail. Moreover, our work can serve as a basis for the construction of other highly catalytically active two-dimensional heterostructures.
    Keywords monolayer g-C 3 N 4 ; CdS ; heterojunction ; photocatalytic hydrogen production ; Organic chemistry ; QD241-441
    Subject code 290
    Language English
    Publishing date 2023-11-01T00:00:00Z
    Publisher MDPI AG
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

    More links

    Kategorien

  7. Article ; Online: High yields of hybrid rice do not require more nitrogen fertilizer than inbred rice

    Le Xu / Shen Yuan / Xinyu Wang / Xing Yu / Shaobing Peng

    Food and Energy Security, Vol 10, Iss 2, Pp 341-

    A meta‐analysis

    2021  Volume 350

    Abstract: Abstract Hybrid rice has been planted throughout China to ensure food security owing to its higher yield potential than inbred rice. Meanwhile, substantial nitrogen (N) fertilizer has been applied to feed hybrid varieties for maximizing grain yield. ... ...

    Abstract Abstract Hybrid rice has been planted throughout China to ensure food security owing to its higher yield potential than inbred rice. Meanwhile, substantial nitrogen (N) fertilizer has been applied to feed hybrid varieties for maximizing grain yield. However, to what extent the higher yield of hybrid than inbred rice depends on N fertilizer input remains unclear. A meta‐analysis was conducted in this study to (1) quantify the difference in N uptake and utilization between hybrid and inbred rice; (2) determine whether hybrid rice requires more N than inbred rice for producing per unit grain yield; and (3) evaluate the impact of the difference in crop growth duration between hybrid and inbred rice on their yield performance. The results showed that, overall, hybrid rice achieved a 10.1% higher grain yield, and 9.7% higher daily grain yield than inbred rice. This grain yield advantage increased from 6.1% to 11.9% depending on whether hybrids have longer crop growth duration than inbred rice. The yield advantage of hybrid rice was explained by higher total N uptake and internal N use efficiency, but not explained by N fertilizer input. Moreover, the yield advantage of hybrid rice with N fertilizer was driven by higher yield without N fertilizer instead of yield response to N fertilizer. These results suggest that hybrid rice does not necessarily require more N fertilizer to achieve higher yield than inbred rice. Therefore, hybrid rice could be planted with fewer external N to ensure food security and reduce environmental costs.
    Keywords grain yield ; hybrid rice ; inbred rice ; nitrogen fertilizer ; Agriculture ; S ; Agriculture (General) ; S1-972
    Subject code 669
    Language English
    Publishing date 2021-05-01T00:00:00Z
    Publisher Wiley
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

    More links

    Kategorien

  8. Article ; Online: Optimal exit choice during highway tunnel evacuations based on the fire locations.

    Yuchen Wang / Jianxiao Ma / Yuhang Liu / Yingjia Bai / Le Xu

    PLoS ONE, Vol 16, Iss 8, p e

    2021  Volume 0256523

    Abstract: In the case of a fire, the choice of exit in the highway tunnel is strictly limited by fire location, which seriously affects the evacuation time. A spontaneous or disorderly exit choice might result in a decreased evacuation efficiency and utilization ... ...

    Abstract In the case of a fire, the choice of exit in the highway tunnel is strictly limited by fire location, which seriously affects the evacuation time. A spontaneous or disorderly exit choice might result in a decreased evacuation efficiency and utilization rate of exits. In this paper, we propose a strategy to obtain the optimal exit choice based on fire location during highway tunnel evacuations. In our strategy, first, the vehicle distributions and locations of evacuating occupants are determined in the traffic simulation program VISSIM. The evacuation simulation software BuildingEXODUS is employed to obtain the corresponding parameters of the evacuation process and analyze the impacts of different fire locations on the evacuation time. During the analysis, the optimal productivity statistics (OPS) is selected as the evaluation index. Then, the feature points of the crowding occupants are captured by the fuzzy c-means (FCM) cluster algorithm. Next, based on the feature points, the relationship between the location of the fire and boundary of the optimal exit choice under the optimal OPS is obtained through the polynomial regression model. It is found that the R-squared(R2) and sum of squares for error (SSE) of the polynomial regression model, reflecting the accuracy estimation, are 98.02% and 2.79×10-4, respectively. Moreover, different fire locations impact the evacuation time of tunnel entrance and evacuation passageway. This paper shows that the location of the fire and boundary of optimal exit choice have a negative linear correlation. Taking the fire 110 m away from the evacuation passageway as an example, the OPS of our strategy can be decreased by 35.6% when compared with no strategies. Our proposed strategy could be applied to determine the location of variable evacuation signs to help evacuating occupants make optimal exit choices.
    Keywords Medicine ; R ; Science ; Q
    Subject code 690
    Language English
    Publishing date 2021-01-01T00:00:00Z
    Publisher Public Library of Science (PLoS)
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

    More links

    Kategorien

  9. Article: Impact of digitalization on clean governance: An analysis of China's experience of 31 provinces from 2019 to 2021.

    Xiaoyan, Du / Ali, Majid / Le, Xu / Qian, Wu / Xuelian, Gao

    Frontiers in psychology

    2022  Volume 13, Page(s) 947388

    Abstract: The goal of deepening institutional reforms was to bring transparency and accountability, address corruption, and establish a clean government (CG) in China. The first step toward this transparency is considered to be the free development and ... ...

    Abstract The goal of deepening institutional reforms was to bring transparency and accountability, address corruption, and establish a clean government (CG) in China. The first step toward this transparency is considered to be the free development and transmission of Open Data (OD). In this regard, China has set up open data centers in provincial governments. Considering that OD can have an impact on CG and bring new ideas for CG construction, ODs of 31 provincial governments have been analyzed through fsQCA3.0 to test these assumptions. To see how much it can contribute to the development of the Technology Organization Environment Framework (TOE). To this end, between 2019 and 2021, 31 provincial government data have been clustered into low, medium, and high corruption case enrollment areas to determine the impact of OD. The study mentioned that improvements in ODs in 31 provinces could strengthen cooperation with the disciplinary inspection department in the fight against corruption. The study, on the other hand, made two assumptions that environmental barriers and internal pressures could affect data's reliability.
    Language English
    Publishing date 2022-07-29
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2563826-9
    ISSN 1664-1078
    ISSN 1664-1078
    DOI 10.3389/fpsyg.2022.947388
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  10. Article ; Online: Chinese expert consensus on diagnosis and management of gastroesophageal reflux disease in the elderly (2023).

    Fangxu, Liu / Wenbin, Li / Pan, Zhang / Dan, Chen / Xi, Wu / Xue, Xu / Jihua, Shi / Qingfeng, Luo / Le, Xu / Songbai, Zheng

    Aging medicine (Milton (N.S.W))

    2024  Volume 7, Issue 2, Page(s) 143–157

    Abstract: Gastroesophageal reflux disease (GERD) in the elderly is characterized by atypical symptoms, relatively severe esophageal injury, and more complications, and when GERD is treated, it is also necessary to fully consider the general health condition of the ...

    Abstract Gastroesophageal reflux disease (GERD) in the elderly is characterized by atypical symptoms, relatively severe esophageal injury, and more complications, and when GERD is treated, it is also necessary to fully consider the general health condition of the elderly patients. This consensus summarized the epidemiology, pathogenesis, clinical manifestations, and diagnosis and treatment characteristics of GERD in the elderly, and provided relevant recommendations, providing guidance for medical personnel to correctly understand and standardize the diagnosis and treatment of GERD in the elderly.
    Language English
    Publishing date 2024-04-12
    Publishing country Australia
    Document type Journal Article
    ISSN 2475-0360
    ISSN (online) 2475-0360
    DOI 10.1002/agm2.12293
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

To top