LIVIVO - The Search Portal for Life Sciences

zur deutschen Oberfläche wechseln
Advanced search

Search results

Result 1 - 10 of total 11141

Search options

  1. Article ; Online: Random coupling model of turbulence as a classical Sachdev-Ye-Kitaev model.

    Hu, Xu-Yao / Rosenhaus, Vladimir

    Physical review. E

    2023  Volume 108, Issue 5-1, Page(s) 54132

    Abstract: We point out that a classical analog of the Sachdev-Ye-Kitaev (SYK) model, a solvable model ...

    Abstract We point out that a classical analog of the Sachdev-Ye-Kitaev (SYK) model, a solvable model of quantum many-body chaos, was studied long ago in the turbulence literature. Motivated by the Navier-Stokes equation in the turbulent regime and the nonlinear Schrödinger equation describing plasma turbulence, in which there is mixing between many different modes, the random coupling model has a Gaussian-random coupling between any four of a large number N of modes. The model was solved in the 1960s, before the introduction of large-N path-integral techniques, using a method referred to as the direct interaction approximation. We use the path integral to derive the effective action for the model. The large-N saddle gives an integral equation for the two-point function, which is very similar to the corresponding equation in the SYK model. The connection between the SYK model and the random coupling model may, on the one hand, provide new physical contexts in which to realize the SYK model and, on the other hand, suggest new models of turbulence and techniques for studying them.
    Language English
    Publishing date 2023-12-19
    Publishing country United States
    Document type Journal Article
    ZDB-ID 2844562-4
    ISSN 2470-0053 ; 2470-0045
    ISSN (online) 2470-0053
    ISSN 2470-0045
    DOI 10.1103/PhysRevE.108.054132
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  2. Article: VEGFA-modified DPSCs combined with LC-YE-PLGA NGCs promote facial nerve injury repair in rats.

    Xu, Wanqiu / Xu, Xiaohang / Yao, Lihong / Xue, Bing / Xi, Hualei / Cao, Xiaofang / Piao, Guiyan / Lin, Song / Wang, Xiumei

    Heliyon

    2023  Volume 9, Issue 4, Page(s) e14626

    Abstract: ... performed. Ten-millimeter facial nerve defect models in rats were established and bridged by LC-YE-PLGA NGCs ... YE-PLGA NGCs have certain advantages in the growth and functional recovery of facial nerves in rats. ...

    Abstract Objective: The aim of this research was to investigate the effect of vascular endothelial growth factor A (VEGFA)-overexpressing rat dental pulp stem cells (rDPSCs) combined with laminin-coated and yarn-encapsulated poly(
    Study design: rDPSCs isolated from rat mandibular central incisor were cultured and identified in vitro and further transfected with the lentiviral vectors (Lv-VEGFA). To investigate the role and mechanisms of VEGFA in neurogenic differentiation in vitro, semaxanib (SU5416), Cell Counting Kit-8 (CCK-8), real-time quantitative polymerase chain reaction (qPCR) and Western blotting were performed. Ten-millimeter facial nerve defect models in rats were established and bridged by LC-YE-PLGA NGCs. The repair effects were detected by transmission electron microscopy (TEM), compound muscle action potential (CMAP), immunohistochemistry and immunofluorescence.
    Results: Extracted cells exhibited spindle-shaped morphology, presented typical markers (CD44
    Conclusion: VEGFA-modified rDPSCs combined with LC-YE-PLGA NGCs have certain advantages in the growth and functional recovery of facial nerves in rats.
    Language English
    Publishing date 2023-03-28
    Publishing country England
    Document type Journal Article
    ZDB-ID 2835763-2
    ISSN 2405-8440
    ISSN 2405-8440
    DOI 10.1016/j.heliyon.2023.e14626
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  3. Article ; Online: Many-Body Chaos in the Sachdev-Ye-Kitaev Model.

    Kobrin, Bryce / Yang, Zhenbin / Kahanamoku-Meyer, Gregory D / Olund, Christopher T / Moore, Joel E / Stanford, Douglas / Yao, Norman Y

    Physical review letters

    2020  Volume 126, Issue 3, Page(s) 30602

    Abstract: ... Krylov subspace methods to calculate dynamical correlators in the Sachdev-Ye-Kitaev model for up to N=60 ...

    Abstract Many-body chaos has emerged as a powerful framework for understanding thermalization in strongly interacting quantum systems. While recent analytic advances have sharpened our intuition for many-body chaos in certain large N theories, it has proven challenging to develop precise numerical tools capable of exploring this phenomenon in generic Hamiltonians. To this end, we utilize massively parallel, matrix-free Krylov subspace methods to calculate dynamical correlators in the Sachdev-Ye-Kitaev model for up to N=60 Majorana fermions. We begin by showing that numerical results for two-point correlation functions agree at high temperatures with dynamical mean field solutions, while at low temperatures finite-size corrections are quantitatively reproduced by the exactly solvable dynamics of near extremal black holes. Motivated by these results, we develop a novel finite-size rescaling procedure for analyzing the growth of out-of-time-order correlators. Our procedure accurately determines the Lyapunov exponent, λ, across a wide range in temperatures, including in the regime where λ approaches the universal bound, λ=2π/β.
    Language English
    Publishing date 2020-08-31
    Publishing country United States
    Document type Journal Article
    ZDB-ID 208853-8
    ISSN 1079-7114 ; 0031-9007
    ISSN (online) 1079-7114
    ISSN 0031-9007
    DOI 10.1103/PhysRevLett.126.030602
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  4. Article: Treatment Efficacy of Chuang Ling Ye, a Traditional Chinese Herbal Medicine Compound, on Idiopathic Granulomatous Mastitis: A Randomized Controlled Trial.

    Xue, Jing-Xian / Ye, Bei / Liu, Shun / Cao, Si-Han / Bian, Wei-He / Yao, Chang

    Evidence-based complementary and alternative medicine : eCAM

    2020  Volume 2020, Page(s) 6964801

    Abstract: Objective: To explore whether Chuang Ling Ye (CLY), a traditional Chinese herbal medicine compound ...

    Abstract Objective: To explore whether Chuang Ling Ye (CLY), a traditional Chinese herbal medicine compound, could improve the treatment of idiopathic granulomatous mastitis (IGM) via decreasing inflammatory response.
    Methods: Herein, 40 patients with IGM who had wounds requiring dressing change were enrolled and randomly divided into two groups: the CLY group and the control group. The size of the neoplasm and pain score of patients were followed-up for 4 weeks. Local tissues were taken during dressing change and examined by commercial enzyme-linked immunosorbent assay (ELISA) kits. The levels of inflammatory markers, including interleukin-1
    Results: After treatment, the size of the neoplasm in the CLY group was significantly smaller than that in the control group (14.28 cm ± 8.96 cm vs. 21.14 cm ± 0.12 cm,
    Conclusion: External use of CLY could reduce the neoplasm of IGM by inhibiting local inflammation. This trial is registered with ChiCTR1800017744.
    Language English
    Publishing date 2020-06-29
    Publishing country United States
    Document type Journal Article
    ZDB-ID 2171158-6
    ISSN 1741-4288 ; 1741-427X
    ISSN (online) 1741-4288
    ISSN 1741-427X
    DOI 10.1155/2020/6964801
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  5. Article ; Online: VEGFA-modified DPSCs combined with LC-YE-PLGA NGCs promote facial nerve injury repair in rats

    Xu, Wanqiu / Xu, Xiaohang / Yao, Lihong / Xue, Bing / Xi, Hualei / Cao, Xiaofang / Piao, Guiyan / Lin, Song / Wang, Xiumei

    Heliyon. 20232023 Apr. 28, Mar. 28, v. 9, no. 4 p.e14626-

    2023  

    Abstract: ... encapsulated poly(ₗ-lactide-co-glycolide) (PLGA) nerve guidance conduit (LC-YE-PLGA NGC) in repairing 10 mm ... defect models in rats were established and bridged by LC-YE-PLGA NGCs. The repair effects were detected ... through vascular endothelial growth factor receptor 2 (VEGFR2) binding. The LC-YE-NGC basically meet the requirements of facial nerve repair ...

    Abstract The aim of this research was to investigate the effect of vascular endothelial growth factor A (VEGFA)-overexpressing rat dental pulp stem cells (rDPSCs) combined with laminin-coated and yarn-encapsulated poly(ₗ-lactide-co-glycolide) (PLGA) nerve guidance conduit (LC-YE-PLGA NGC) in repairing 10 mm facial nerve injury in rats. rDPSCs isolated from rat mandibular central incisor were cultured and identified in vitro and further transfected with the lentiviral vectors (Lv-VEGFA). To investigate the role and mechanisms of VEGFA in neurogenic differentiation in vitro, semaxanib (SU5416), Cell Counting Kit-8 (CCK-8), real-time quantitative polymerase chain reaction (qPCR) and Western blotting were performed. Ten-millimeter facial nerve defect models in rats were established and bridged by LC-YE-PLGA NGCs. The repair effects were detected by transmission electron microscopy (TEM), compound muscle action potential (CMAP), immunohistochemistry and immunofluorescence. Extracted cells exhibited spindle-shaped morphology, presented typical markers (CD44⁺CD90⁺CD34⁻CD45⁻), and presented multidirectional differentiation potential. The DPSCs with VEGFA overexpression were constructed successfully. VEGFA enhanced the proliferation and neural differentiation ability of rDPSCs, and the expression of neuron-specific enolase (NSE) and βIII-tubulin was increased. However, these trends were reversed with the addition of SU5416. This suggests that VEGFA mediates the above effects mainly through vascular endothelial growth factor receptor 2 (VEGFR2) binding. The LC-YE-NGC basically meet the requirements of facial nerve repair. For the in vivo experiment, the CMAP latency period was shorter in DPSCS-VEGFA-NGC group in comparison with other experimental groups, while the amplitude was increased. Such functional recovery correlated well with an increase in histological improvement. Further study suggested that VEGFA-modified DPSCs could increase the myelin number, thickness and axon diameter of facial nerve. NSE, βIII-tubulin and S100 fluorescence intensity and immunohistochemical staining intensity were significantly enhanced. VEGFA-modified rDPSCs combined with LC-YE-PLGA NGCs have certain advantages in the growth and functional recovery of facial nerves in rats.
    Keywords action potentials ; axons ; fluorescence ; fluorescent antibody technique ; immunohistochemistry ; muscles ; myelin sheath ; nerve tissue ; phosphopyruvate hydratase ; quantitative polymerase chain reaction ; rats ; tooth pulp ; transmission electron microscopy ; vascular endothelial growth factor A ; vascular endothelial growth factor receptor-2 ; rDPSCs ; VEGFA ; Neural differentiation ; Facial nerve defects ; SU5416 ; Neural tissue engineering ; LC-YE-PLGA NGC ; TEM ; CMAP ; NSE ; VEGFR2 ; SC ; PLA ; PGA
    Language English
    Dates of publication 2023-0328
    Publishing place Elsevier Ltd
    Document type Article ; Online
    Note Use and reproduction
    ZDB-ID 2835763-2
    ISSN 2405-8440
    ISSN 2405-8440
    DOI 10.1016/j.heliyon.2023.e14626
    Database NAL-Catalogue (AGRICOLA)

    More links

    Kategorien

  6. Article ; Online: VEGFA-modified DPSCs combined with LC-YE-PLGA NGCs promote facial nerve injury repair in rats

    Wanqiu Xu / Xiaohang Xu / Lihong Yao / Bing Xue / Hualei Xi / Xiaofang Cao / Guiyan Piao / Song Lin / Xiumei Wang

    Heliyon, Vol 9, Iss 4, Pp e14626- (2023)

    2023  

    Abstract: ... encapsulated poly(l-lactide-co-glycolide) (PLGA) nerve guidance conduit (LC-YE-PLGA NGC) in repairing 10 mm ... performed. Ten-millimeter facial nerve defect models in rats were established and bridged by LC-YE-PLGA NGCs ... VEGFR2) binding. The LC-YE-NGC basically meet the requirements of facial nerve repair. For the in vivo ...

    Abstract Objective: The aim of this research was to investigate the effect of vascular endothelial growth factor A (VEGFA)-overexpressing rat dental pulp stem cells (rDPSCs) combined with laminin-coated and yarn-encapsulated poly(l-lactide-co-glycolide) (PLGA) nerve guidance conduit (LC-YE-PLGA NGC) in repairing 10 mm facial nerve injury in rats. Study Design: rDPSCs isolated from rat mandibular central incisor were cultured and identified in vitro and further transfected with the lentiviral vectors (Lv-VEGFA). To investigate the role and mechanisms of VEGFA in neurogenic differentiation in vitro, semaxanib (SU5416), Cell Counting Kit-8 (CCK-8), real-time quantitative polymerase chain reaction (qPCR) and Western blotting were performed. Ten-millimeter facial nerve defect models in rats were established and bridged by LC-YE-PLGA NGCs. The repair effects were detected by transmission electron microscopy (TEM), compound muscle action potential (CMAP), immunohistochemistry and immunofluorescence. Results: Extracted cells exhibited spindle-shaped morphology, presented typical markers (CD44+CD90+CD34−CD45−), and presented multidirectional differentiation potential. The DPSCs with VEGFA overexpression were constructed successfully. VEGFA enhanced the proliferation and neural differentiation ability of rDPSCs, and the expression of neuron-specific enolase (NSE) and βIII-tubulin was increased. However, these trends were reversed with the addition of SU5416. This suggests that VEGFA mediates the above effects mainly through vascular endothelial growth factor receptor 2 (VEGFR2) binding. The LC-YE-NGC basically meet the requirements of facial nerve repair. For the in vivo experiment, the CMAP latency period was shorter in DPSCS-VEGFA-NGC group in comparison with other experimental groups, while the amplitude was increased. Such functional recovery correlated well with an increase in histological improvement. Further study suggested that VEGFA-modified DPSCs could increase the myelin number, thickness and axon diameter of facial ...
    Keywords rDPSCs ; VEGFA ; Neural differentiation ; Facial nerve defects ; SU5416 ; Neural tissue engineering ; Science (General) ; Q1-390 ; Social sciences (General) ; H1-99
    Subject code 616
    Language English
    Publishing date 2023-04-01T00:00:00Z
    Publisher Elsevier
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

    More links

    Kategorien

  7. Article ; Online: The validity of Pelophylax chosenicus (Okada, 1931) and P. hubeiensis (Fei & Ye, 1982) (Amphibia, Ranidae)

    Zhou, Sheng-Bo / Zhang, Qiu-Yi / Hu, Zi-Qiang / Xia, Zu-Yao / Miao, Qing / Guan, Ping / Shi, Jing-Song

    Herpetozoa. 2023 June 21, v. 36 p.143-152

    2023  

    Abstract: ... hubeiensis (Fei & Ye, 1982) were described chronologically from East Asia. The three species have similar ...

    Abstract AbstractPelophylax plancyi (Lataste, 1880), Pelophylax chosenicus (Okada, 1931) and Pelophylax hubeiensis (Fei & Ye, 1982) were described chronologically from East Asia. The three species have similar morphological and molecular characteristics, but the taxonomic relationships amongst them have long been ambiguous. To deal with this taxonomic issue, we examined newly-obtained topotypic specimens of P. plancyi, P. chosenicus and P. hubeiensis for morphological comparison. Furthermore, we investigated the phylogeny of pond frogs in Eurasia by Bayesian Inference and Maximum Likelihood analyses of a fragment consisting of mitochondrial DNA gene 16s and provided a molecular phylogeny of the genus Pelophylax. There were no morphological and molecular differences between P. plancyi and P. chosenicus, but both morphological and molecular differences between P. hubeiensis and P. plancyi. Hence, we conclude that P. chosenicus is a junior synonym of P. plancyi and P. hubeiensis is a separate species from P. plancyi.
    Keywords Bayesian theory ; Pelophylax ; genes ; mitochondrial DNA ; phylogeny ; statistical analysis ; East Asia ; Eurasia ; amphibians ; morphology ; synonym ; taxonomy
    Language English
    Dates of publication 2023-0621
    Size p. 143-152.
    Publishing place Pensoft Publishers
    Document type Article ; Online
    ZDB-ID 2474932-1
    ISSN 2682-955X
    ISSN 2682-955X
    DOI 10.3897/herpetozoa.36.e100072
    Database NAL-Catalogue (AGRICOLA)

    More links

    Kategorien

  8. Article ; Online: Treatment Efficacy of Chuang Ling Ye, a Traditional Chinese Herbal Medicine Compound, on Idiopathic Granulomatous Mastitis

    Jing-xian Xue / Bei Ye / Shun Liu / Si-han Cao / Wei-he Bian / Chang Yao

    Evidence-Based Complementary and Alternative Medicine, Vol

    A Randomized Controlled Trial

    2020  Volume 2020

    Abstract: Objective. To explore whether Chuang Ling Ye (CLY), a traditional Chinese herbal medicine compound ...

    Abstract Objective. To explore whether Chuang Ling Ye (CLY), a traditional Chinese herbal medicine compound, could improve the treatment of idiopathic granulomatous mastitis (IGM) via decreasing inflammatory response. Methods. Herein, 40 patients with IGM who had wounds requiring dressing change were enrolled and randomly divided into two groups: the CLY group and the control group. The size of the neoplasm and pain score of patients were followed-up for 4 weeks. Local tissues were taken during dressing change and examined by commercial enzyme-linked immunosorbent assay (ELISA) kits. The levels of inflammatory markers, including interleukin-1β (IL-1β), IL-2, IL-6, interferon gamma (IFN-γ), and tumor necrosis factor-α (TNF-α) were measured. Results. After treatment, the size of the neoplasm in the CLY group was significantly smaller than that in the control group (14.28 cm ± 8.96 cm vs. 21.14 cm ± 0.12 cm, P=0.038), and the pain scores were markedly reduced (P=0.004). Besides, CLY downregulated the expression levels of IL-1β, IFN-γ, and TNF-α. Conclusion. External use of CLY could reduce the neoplasm of IGM by inhibiting local inflammation. This trial is registered with ChiCTR1800017744.
    Keywords Other systems of medicine ; RZ201-999
    Language English
    Publishing date 2020-01-01T00:00:00Z
    Publisher Hindawi Limited
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

    More links

    Kategorien

  9. Article ; Online: Solvable Sachdev-Ye-Kitaev Models in Higher Dimensions: From Diffusion to Many-Body Localization.

    Jian, Shao-Kai / Yao, Hong

    Physical review letters

    2017  Volume 119, Issue 20, Page(s) 206602

    Abstract: ... a higher-dimensional generalization of the Sachdev-Ye-Kitaev (SYK) model and show that it exhibits a MBL ...

    Abstract Many aspects of many-body localization (MBL) transitions remain elusive so far. Here, we propose a higher-dimensional generalization of the Sachdev-Ye-Kitaev (SYK) model and show that it exhibits a MBL transition. The model on a bipartite lattice has N Majorana fermions with SYK interactions on each site of the A sublattice and M free Majorana fermions on each site of the B sublattice, where N and M are large and finite. For r≡M/N<r_{c}=1, it describes a diffusive metal exhibiting maximal chaos. Remarkably, its diffusive constant D vanishes [D∝(r_{c}-r)^{1/2}] as r→r_{c}, implying a dynamical transition to a MBL phase. It is further supported by numerical calculations of level statistics which changes from Wigner-Dyson (r<r_{c}) to Poisson (r>r_{c}) distributions. Note that no subdiffusive phase intervenes between diffusive and MBL phases. Moreover, the critical exponent ν=0, violating the Harris criterion. Our higher-dimensional SYK model may provide a promising arena to explore exotic MBL transitions.
    Language English
    Publishing date 2017-11-17
    Publishing country United States
    Document type Journal Article
    ZDB-ID 208853-8
    ISSN 1079-7114 ; 0031-9007
    ISSN (online) 1079-7114
    ISSN 0031-9007
    DOI 10.1103/PhysRevLett.119.206602
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  10. Article: Eco-efficient Cementitious System Consisting of Belite-Ye’elimite-Ferrite Cement, Limestone Filler, and Silica Fume

    Li, Chen / Mengxue Wu / Wu Yao

    ACS sustainable chemistry & engineering. 2019 Mar. 21, v. 7, no. 8

    2019  

    Abstract: ... As an alternative binder of Portland cement, belite-ye’elimite-ferrite (BYF) cement can reduce the CO₂ emission ...

    Abstract One of the main concerns in the modern cement industry is on reducing the CO₂ emissions. As an alternative binder of Portland cement, belite-ye’elimite-ferrite (BYF) cement can reduce the CO₂ emission by over 20% due to its benefits concerning the chemical composition and industrial processing. This paper proposed a ternary cementitious system consisting of BYF cement, limestone filler, and silica fume. The ternary system containing 10% limestone and 5% silica fume showed higher compressive strength than the BYF cement, while the CO₂ emission factor further reduced by ∼13%. The effect of limestone and silica fume on the hydration was studied. It was found that the hydration reaction of limestone induced the formation of hemicarbonate and stabilized ettringite. This reaction formed dissolution rims around the limestone particles. At the early hydration ages, silica fume was bonded by aluminum hydroxide, forming aluminate silicate hydrate. During the hydration, the silicate dissolved and reacted with the hydration products in the dissolution rims of limestone. This reaction increased the Si content in the rims, and may potentially contribute to the compressive strength development of the ternary cementitious system.
    Keywords aluminum hydroxide ; carbon dioxide ; cement ; chemical composition ; compression strength ; emissions factor ; greenhouse gas emissions ; industry ; limestone ; processing technology ; silica ; silicates ; silicon
    Language English
    Dates of publication 2019-0321
    Size p. 7941-7950.
    Publishing place American Chemical Society
    Document type Article
    ISSN 2168-0485
    DOI 10.1021/acssuschemeng.9b00702
    Database NAL-Catalogue (AGRICOLA)

    More links

    Kategorien

To top