1,996 research outputs found

    Deterministic walks in random networks: an application to thesaurus graphs

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    In a landscape composed of N randomly distributed sites in Euclidean space, a walker (``tourist'') goes to the nearest one that has not been visited in the last \tau steps. This procedure leads to trajectories composed of a transient part and a final cyclic attractor of period p. The tourist walk presents universal aspects with respect to \tau and can be done in a wide range of networks that can be viewed as ordinal neighborhood graphs. As an example, we show that graphs defined by thesaurus dictionaries share some of the statistical properties of low dimensional (d=2) Euclidean graphs and are easily distinguished from random graphs. This approach furnishes complementary information to the usual clustering coefficient and mean minimum separation length.Comment: 12 pages, 5 figures, revised version submited to Physica A, corrected references to figure

    Anomalous Hopping Exponents of Ultrathin Films of Metals

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    The temperature dependence of the resistance R(T) of ultrathin quench-condensed films of Ag, Bi, Pb and Pd has been investigated. In the most resistive films, R(T)=Roexp(To/T)^x, where x=0.75. Surprisingly, the exponent x was found to be constant for a wide range of Ro and To in all four materials, possibly implying a consistent underlying conduction mechanism. The results are discussed in terms of several different models of hopping conduction.Comment: 6 pages, 5 figure

    Role of T-type calcium current in identified D-hair mechanoreceptor neurons studied in vitro

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    Different subsets of dorsal root ganglion (DRG) mechanoreceptors transduce low- and high-intensity mechanical stimuli. It was shown recently that, in vivo, neurotrophin-4 (NT-4)-dependent D-hair mechanoreceptors specifically express a voltage-activated T-type calcium channel (Ca(v)3.2) that may be required for their mechanoreceptive function. Here we show that D-hair mechanoreceptors can be identified in vitro by a rosette-like morphology in the presence of NT-4 and that these rosette neurons are almost all absent in DRG cultures taken from NT-4 knock-out mice. In vitro identification of the D-hair mechanoreceptor allowed us to explore the electrophysiological properties of these cells. We demonstrate that the T-type Ca(v)3.2 channel induced slow membrane depolarization that contributes to lower the voltage threshold for action potential generation and controls spike latency after stimulation of D-hair mechanoreceptors. Indeed, the properties of the T-type amplifier are particularly well suited to explain the high sensitivity of D-hair mechanoreceptors to slowly moving stimuli

    Surgical stabilization of shoulder luxation in a pot-bellied pig

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    CASE DESCRIPTION—A 4.6-month-old pot-bellied pig was evaluated because of non–weightbearing lameness (grade 5/5) in the right forelimb of 4 days’ duration. CLINICAL FINDINGS—Clinical and radiographic examination revealed a closed, lateral luxation of the right shoulder joint. TREATMENT AND OUTCOME—Initial attempts at closed reduction failed to provide adequate stability of the shoulder joint. Open reduction and internal fixation by placement of 2 lateral tension sutures with a system designed for canine cranial cruciate ligament repair provided adequate joint stability and a successful outcome. CONCLUSIONS AND CLINICAL RELEVANCE—Stabilization of the shoulder joint with lateral tension sutures after open reduction should be considered for management of lateral shoulder luxation in pot-bellied pigs.http://avmajournals.avma.org/loi/javmaam2013mn2013mn201

    Identifying the quark content of the isoscalar scalar mesons f_0(980), f_0(1370), and f_0(1500) from weak and electromagnetic processes

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    The assignments of the isoscalar scalar mesons f0(980), f0(1370), and f0(1500) in terms of their qqbar substructure is still a matter of heated dispute. Here we employ the weak and electromagnetic decays D(s)(+) to f0+pi(+) and f0 two-photon decays, respectively, to identify the f0(980) and f0(1500) as mostly ssbar, and the f0(1370) as dominantly nonstrange, in agreement with previous work. The two-photon decays can be satisfactorily described with quark as well as with meson loops, though the latter ones provide a less model-dependent and more quantitative description.Comment: v1, 15 pages, plain LaTeX, 1 eps figure. v2, 18 pages, plain LaTeX (figure included). More discussion, especially on the f0(1370) and its empirical two-photon widt

    Orbital Polarons in the Metal-Insulator Transition of Manganites

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    The metal-insulator transition in manganites is strongly influenced by the concentration of holes present in the system. Based upon an orbitally degenerate Mott-Hubbard model we analyze two possible localization scenarios to account for this doping dependence: First, we rule out that the transition is initiated by a disorder-order crossover in the orbital sector, showing that its effect on charge mobility is only small. Second, we introduce the idea of orbital polarons originating from a strong polarization of orbitals in the vicinity of holes. Considering this direct coupling between charge and orbital degree of freedom in addition to lattice effects we are able to explain well the phase diagram of manganites for low and intermediate hole concentrations

    Body condition alters glutathione and nuclear factor erythroid 2-like 2 (NFE2L2)-related antioxidant network abundance in subcutaneous adipose tissue of periparturient Holstein cows

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    [EN] Dairy cows with high body condition score (BCS) in late prepartum are more susceptible to oxidative stress (OS). Nuclear factor erythroid 2-like 2 (NFE2L2) is a major antioxidant transcription factor. We investigated the effect of precalving BCS on blood biomarkers associated with OS, inflammation, and liver function, along with mRNA and protein abundance of targets related to NFE2L2 and glutathione (GSH) metabolism in s.c. adipose tissue (SAT) of periparturient dairy cows. Twenty-two multiparous Holstein cows were retrospectively classified into a high BCS (HBCS; n = 11, BCS ¿3.5) or normal BCS (NBCS; n = 11, BCS ¿3.17) on d 28 before parturition. Cows were fed a corn silage- and wheat straw-based total mixed ration during late prepartum, and a corn silage- and alfalfa hay-based total mixed ration postpartum. Blood samples obtained at ¿10, 7, 15, and 30 d relative to parturition were used for analyses of biomarkers associated with inflammation, including albumin, ceruloplasmin, haptoglobin, and myeloperoxidase, as well as OS, including ferric reducing ability of plasma (FRAP), reactive oxygen species (ROS), and ß-carotene. Adipose biopsies harvested at ¿15, 7, and 30 d relative to parturition were analyzed for mRNA (real-time quantitative PCR) and protein abundance (Western blotting) of targets associated with the antioxidant transcription regulator nuclear factor, NFE2L2, and GSH metabolism pathway. In addition, concentrations of GSH, ROS and malondialdehyde were measured. High BCS cows had lower prepartum dry matter intake expressed as a percentage of body weight along with greater BCS loss between ¿4 and 4 wk relative to parturition. Plasma concentrations of ROS and FRAP increased after parturition regardless of treatment. Compared with NBCS, HBCS cows had greater concentrations of FRAP at d 7 postpartum, which coincided with peak values in those cows. In addition, NBCS cows experienced a marked decrease in plasma ROS after d 7 postpartum, while HBCS cows maintained a constant concentration by d 30 postpartum. Overall, ROS concentrations in SAT were greater in HBCS cows. However, overall mRNA abundance of NFE2L2 was lower and cullin 3 (CUL3), a negative regulator of NFE2L2, was greater in HBCS cows. Although HBCS cows had greater overall total protein abundance of NFE2L2 in SAT, ratio of phosphorylated NFE2L2 to total NFE2L2 was lower, suggesting a decrease in the activity of this antioxidant system. Overall, mRNA abundance of the GSH metabolism-related genes glutathione reductase (GSR), glutathione peroxidase 1 (GPX1), and transaldolase 1 (TALDO1), along with protein abundance of glutathione S-transferase mu 1 (GSTM1), were greater in HBCS cows. Data suggest that HBCS cows might experience greater systemic OS after parturition, while increased abundance of mRNA and protein components of the GSH metabolism pathway in SAT might help alleviate tissue oxidant status. Data underscored the importance of antioxidant mechanisms at the tissue level. Thus, targeting these pathways in SAT during the periparturient period via nutrition might help control tissue remodeling while allowing optimal performance.Y. Liang is a recipient of a doctoral fellowship from China Scholarship Council (CSC, Beijing, China). A. S. Alharthi received a fellowship from King Saud University to perform his PhD studies at the University of Illinois (Urbana). A. A. Elolimy was recipient of a fellowship from Higher Education Ministry, Egypt to perform his Ph.D. studies at the University of Illinois (Urbana). We thank Perdue AgriBusiness (Salisbury, MD) for the donation of ProvAAL2 AADvantage during the course of the experiment. The authors have not stated any conflicts of interest.Liang, Y.; Alharthi, A.; Bucktrout, R.; Elolimy, A.; Lopreiato, V.; Martinez-Cortes, I.; Xu, C.... (2020). Body condition alters glutathione and nuclear factor erythroid 2-like 2 (NFE2L2)-related antioxidant network abundance in subcutaneous adipose tissue of periparturient Holstein cows. Journal of Dairy Science. 103(7):6439-6453. https://doi.org/10.3168/jds.2019-17813S643964531037Alharthi, A., Zhou, Z., Lopreiato, V., Trevisi, E., & Loor, J. J. (2018). Body condition score prior to parturition is associated with plasma and adipose tissue biomarkers of lipid metabolism and inflammation in Holstein cows. Journal of Animal Science and Biotechnology, 9(1). doi:10.1186/s40104-017-0221-1Aquilano, K., Baldelli, S., & Ciriolo, M. R. (2014). Glutathione: new roles in redox signaling for an old antioxidant. 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Insulin response of the glucose and fatty acid metabolism in dry dairy cows across a range of body condition scores. Journal of Dairy Science, 98(7), 4580-4592. doi:10.3168/jds.2015-9341De Koster, J., Strieder-Barboza, C., de Souza, J., Lock, A. L., & Contreras, G. A. (2018). Short communication: Effects of body fat mobilization on macrophage infiltration in adipose tissue of early lactation dairy cows. Journal of Dairy Science, 101(8), 7608-7613. doi:10.3168/jds.2017-14318De Koster, J., Van den Broeck, W., Hulpio, L., Claeys, E., Van Eetvelde, M., Hermans, K., … Opsomer, G. (2016). Influence of adipocyte size and adipose depot on the in vitro lipolytic activity and insulin sensitivity of adipose tissue in dairy cows at the end of the dry period. Journal of Dairy Science, 99(3), 2319-2328. doi:10.3168/jds.2015-10440Depreester, E., De Koster, J., Van Poucke, M., Hostens, M., Van den Broeck, W., Peelman, L., … Opsomer, G. (2018). Influence of adipocyte size and adipose depot on the number of adipose tissue macrophages and the expression of adipokines in dairy cows at the end of pregnancy. Journal of Dairy Science, 101(7), 6542-6555. doi:10.3168/jds.2017-13777Depreester, E., Meyer, E., Demeyere, K., Van Eetvelde, M., Hostens, M., & Opsomer, G. (2017). Flow cytometric assessment of myeloperoxidase in bovine blood neutrophils and monocytes. Journal of Dairy Science, 100(9), 7638-7647. doi:10.3168/jds.2016-12186Dickinson, D. A., & Forman, H. J. (2002). Cellular glutathione and thiols metabolism. Biochemical Pharmacology, 64(5-6), 1019-1026. doi:10.1016/s0006-2952(02)01172-3Drevet, J. R. (2006). The antioxidant glutathione peroxidase family and spermatozoa: A complex story. Molecular and Cellular Endocrinology, 250(1-2), 70-79. doi:10.1016/j.mce.2005.12.027Edmonson, A. J., Lean, I. J., Weaver, L. D., Farver, T., & Webster, G. (1989). A Body Condition Scoring Chart for Holstein Dairy Cows. 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Methionine supply alters mammary gland antioxidant gene networks via phosphorylation of nuclear factor erythroid 2-like 2 (NFE2L2) protein in dairy cows during the periparturient period. Journal of Dairy Science, 101(9), 8505-8512. doi:10.3168/jds.2017-14206Han, L. Q., Zhou, Z., Ma, Y., Batistel, F., Osorio, J. S., & Loor, J. J. (2018). Phosphorylation of nuclear factor erythroid 2-like 2 (NFE2L2) in mammary tissue of Holstein cows during the periparturient period is associated with mRNA abundance of antioxidant gene networks. Journal of Dairy Science, 101(7), 6511-6522. doi:10.3168/jds.2017-14257Harvey, C. J., Thimmulappa, R. K., Singh, A., Blake, D. J., Ling, G., Wakabayashi, N., … Biswal, S. (2009). Nrf2-regulated glutathione recycling independent of biosynthesis is critical for cell survival during oxidative stress. Free Radical Biology and Medicine, 46(4), 443-453. doi:10.1016/j.freeradbiomed.2008.10.040Holtenius, K., Agenäs, S., Delavaud, C., & Chilliard, Y. (2003). Effects of Feeding Intensity During the Dry Period. 2. Metabolic and Hormonal Responses. Journal of Dairy Science, 86(3), 883-891. doi:10.3168/jds.s0022-0302(03)73671-6Jaakson, H., Karis, P., Ling, K., Ilves-Luht, A., Samarütel, J., Henno, M., … Ots, M. (2018). Adipose tissue insulin receptor and glucose transporter 4 expression, and blood glucose and insulin responses during glucose tolerance tests in transition Holstein cows with different body condition. Journal of Dairy Science, 101(1), 752-766. doi:10.3168/jds.2017-12877Ji, P., Osorio, J. S., Drackley, J. K., & Loor, J. J. (2012). Overfeeding a moderate energy diet prepartum does not impair bovine subcutaneous adipose tissue insulin signal transduction and induces marked changes in peripartal gene network expression. Journal of Dairy Science, 95(8), 4333-4351. doi:10.3168/jds.2011-5079Kobayashi, H., Matsuda, M., Fukuhara, A., Komuro, R., & Shimomura, I. (2009). Dysregulated glutathione metabolism links to impaired insulin action in adipocytes. American Journal of Physiology-Endocrinology and Metabolism, 296(6), E1326-E1334. doi:10.1152/ajpendo.90921.2008Lacetera, N., Scalia, D., Bernabucci, U., Ronchi, B., Pirazzi, D., & Nardone, A. (2005). Lymphocyte Functions in Overconditioned Cows Around Parturition. Journal of Dairy Science, 88(6), 2010-2016. doi:10.3168/jds.s0022-0302(05)72877-0LeBlanc, S. J., Herdt, T. H., Seymour, W. M., Duffield, T. F., & Leslie, K. E. (2004). Peripartum Serum Vitamin E, Retinol, and Beta-Carotene in Dairy Cattle and Their Associations with Disease. Journal of Dairy Science, 87(3), 609-619. doi:10.3168/jds.s0022-0302(04)73203-8Liang, Y., Batistel, F., Parys, C., & Loor, J. J. (2019). Glutathione metabolism and nuclear factor erythroid 2-like 2 (NFE2L2)-related proteins in adipose tissue are altered by supply of ethyl-cellulose rumen-protected methionine in peripartal Holstein cows. 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    Active ingredients, mechanisms of action and efficacy tests of antipollution cosmetic and personal care products

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    Urban population around the globe is direct exposed to the pollution caused by several sources (vehicles, industries, smokes etc.) and primary pollutants are divided in particulate matter and toxic gases. Current researches in populous countries indicated that exposure to pollution could affect sebum composition, stratum corneum quality and signs of skin aging. Hair and scalp are also affected by the excessive exposure to pollutants, resulting in a dull, dry and lifeless appearance. Cosmetics have been evolved conceptual and scientifically to achieve substantial effectiveness against pollution damaging on the cutaneous tissue, involving the development of innovative multipurpose active ingredients and efficacy tests, skilled to prove the protection and benefits of such personal care products. In this review, we highlighted the skin and hair/scalp damages provoked by the main environmental pollutants and the active substances used in antipollution cosmetics/personal care products with the respective mechanisms of action. Likewise, in vitro and in vivo efficacy tests were discussed concerning the antipollution claim substantiating

    A framework for the local information dynamics of distributed computation in complex systems

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    The nature of distributed computation has often been described in terms of the component operations of universal computation: information storage, transfer and modification. We review the first complete framework that quantifies each of these individual information dynamics on a local scale within a system, and describes the manner in which they interact to create non-trivial computation where "the whole is greater than the sum of the parts". We describe the application of the framework to cellular automata, a simple yet powerful model of distributed computation. This is an important application, because the framework is the first to provide quantitative evidence for several important conjectures about distributed computation in cellular automata: that blinkers embody information storage, particles are information transfer agents, and particle collisions are information modification events. The framework is also shown to contrast the computations conducted by several well-known cellular automata, highlighting the importance of information coherence in complex computation. The results reviewed here provide important quantitative insights into the fundamental nature of distributed computation and the dynamics of complex systems, as well as impetus for the framework to be applied to the analysis and design of other systems.Comment: 44 pages, 8 figure
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