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Colorful facial markings are associated with foraging rates and affiliative relationships in a wild group-living cichlid fish

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Current Zoology 2024年第1期70卷 70-78页

作者： Brett M.Culbert James B.Barnett Isaac Y.Ligocki Matthew G.Salena Marian Y.L.Wong Ian M.Hamilton sigal balshine Department of Integrative Biology University of GuelphGuelphOntarioCanada Department of Psychology Neuroscience&BehaviourMcMaster UniversityHamiltonOntarioCanada Department of Evolution Ecologyand Organismal BiologyThe Ohio State UniversityColumbusOHUSA Department of Biology Millersville UniversityMillersvillePAUSA School of Earth Atmospheric and Life SciencesUniversity of WollongongWollongongNew South WalesAustralia Department of Mathematics The Ohio State UniversityColumbusOHUSA

Many animals use color to signal their quality and/or behavioral *** signals have been well studied in the contexts of competi-tion and mate choice;however,the role of these signals in nonsexual,affiliative relationships is not as well ***,we used wild social groups of the cichlid fish Neolamprologus pulcher to investigate whether the size of a brightly colored facial patch was related to 1)individual quality,2)social dominance,and/or 3)affiliative *** with larger patches spent more time foraging and tended to perform more aggressive acts against conspecific territory *** did not find any evidence that the size of these yellow patches was related to social rank or body size,but dominant males tended to have larger patches than dominant ***,patch size had a rank-specific relationship with the number of affiliative interactions that individuals engaged *** males with large patches received fewer affiliative acts from their groupmates compared to dominant males with small ***,subordinates with large patches tended to receive more affiliative acts from their groupmates while performing fewer affiliative acts *** together,our results suggest that patch size reflects interindividual variation in foraging effort in this cichlid fish and offer some of the first evidence that colorful signals may shape affiliative relationships withinwildsocialgroups.

关键词： affiliation foraging Lake Tanganyika Neolamprologus pulcher visual signals

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Dominance network structure across reproductive contexts in the cooperatively breeding cichlid fish Neolamprologus pulcher

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Current Zoology 2015年第1期61卷 45-54页

作者： Cody J. DEY Q.Y. Joanne TAN Constance M. O'CONNOR Adam R. REDDON J. Ryan CALDWELL sigal balshine Department of Biology McMaster University Hamilton Ontario ON L8S 4K1 Canada Department of Psychology Neuroscience and Behaviour McMaster University Hamilton Ontario L8S 4L8 Canada

While a large number of studies have described animal social networks, we have a poor understanding of how these networks vary with ecological and social conditions. For example, reproductive periods are an important life-history stage that may involve changes in dominance relationships among individuals, yet no study to date has compared social networks of do- minance interactions （i.e. dominance networks） across reproductive contexts. We first analyzed a long-term dataset on captive so- cial groups of the cooperatively breeding cichlid Neolamprologuspulcher, and found that eviction events were significantly more common around reproduction than expected by chance. Next, we compared the structure of dominance networks during early pa- rental care and non-reproductive periods, using one of the first applications of exponential random graph models in behavioral biology. Contrary to our predictions, we found that dominance networks showed few changes between early parental care and non-reproductive periods. We found no evidence that dominance interactions became more skewed towards larger individuals, became more frequent between similar-sized individuals, or became more biased towards a particular sex during parental care. However, we did find that there were relatively more dominance interactions between opposite-sex dyads in the early parental care period, which may be a by-product of increased sexual interactions during this time. This is the first study in behavioral ecology to compare social networks using exponential random graph modeling, and demonstrates a powerful analytical framework for future studies in the field [Current Zoology 61 （1）： 45-54, 2015].

关键词： Social network Aggression Submissive Hierarchy Parental care P* model

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Stability Analysis and Performance Evaluation of Additive Mixed-Precision Runge-Kutta Methods

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Communications on Applied Mathematics and Computation 2024年第1期6卷 705-738页

作者： Ben Burnett sigal Gottlieb Zachary J.Grant Center for Scientific Computing and Data Science Research UMass DartmouthNorth DartmouthMassachusettsUSA CSME Michigan State UniversityEast LansingMichiganUSA

Additive Runge-Kutta methods designed for preserving highly accurate solutions in mixed-precision computation were previously proposed and *** specially designed methods use reduced precision for the implicit computations and full precision for the explicit *** this work,we analyze the stability properties of these methods and their sensitivity to the low-precision rounding errors,and demonstrate their performance in terms of accuracy and *** develop codes in FORTRAN and Julia to solve nonlinear systems of ODEs and PDEs using the mixed-precision additive Runge-Kutta(MP-ARK)*** convergence,accuracy,and runtime of these methods are *** show that for a given level of accuracy,suitably chosen MP-ARK methods may provide significant reductions in runtime.

关键词： Mixed precision Runge-Kutta methods Additive methods Accuracy

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Human embryo models: unveiling sophisticated self-organization of stem cells during post-implantation stages

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Signal Transduction and Targeted Therapy 2023年第12期8卷 5565-5567页

作者： Manqiang Lin Michael sigal Department of Hepatology and Gastroenterology CharitéUniversitätsmedizin Berlin13353 BerlinGermany Berlin Institute for Medical Systems Biology(BIMSB) Max Delbrück Center for Molecular Medicine10115 BerlinGermany

In three recent articles published in Nature and Cell,Weatherbee et al.1,Pedroza et al.2 and Liu et al.3 have demonstrated how human pluripotent stem cells can be coaxed to self-organize into compartmentalized structures that mirror post-implantation *** on the successful establishment of stem cell-derived mouse embryo models ex utero,these models now shed light on human embryo development during the period between implantation and gastrulation,which has so far been challenging to investigate.

关键词： implantation Human mirror

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A Review of David Gottlieb’s Work on the Resolution of the Gibbs Phenomenon

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Communications in Computational Physics 2011年第3期9卷 497-519页

作者： sigal Gottlieb Jae-Hun Jung Saeja Kim Mathematics Department University of Massachusetts DartmouthNorth DartmouthMA 02747USA Mathematics Department Suny BuffaloBuffaloNew York 14260-2900USA

Given a piecewise smooth function,it is possible to construct a global expansion in some complete orthogonal basis,such as the Fourier ***,the local discontinuities of the function will destroy the convergence of global approximations,even in regions for which the underlying function is *** global expansions are contaminated by the presence of a local discontinuity,and the result is that the partial sums are oscillatory and feature non-uniform *** characteristic behavior is called the Gibbs ***,David Gottlieb and Chi-Wang Shu showed that these slowly and non-uniformly convergent global approximations retain within them high order information which can be recovered with suitable *** this paper we review the history of the Gibbs phenomenon and the story of its resolution.

关键词： Gibbs phenomenon post-processing Galerkin approximation collocation approximation spectral methods exponential accuracy

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Numerical Issues in the Implementation of High Order Polynomial Multi-Domain Penalty Spectral Galerkin Methods for Hyperbolic Conservation Laws

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Communications in Computational Physics 2009年第2期5卷 600-619页

作者： sigal Gottlieb Jae-Hun Jung Department of Mathematics University of Massachusetts at DartmouthNorth DartmouthMA 02747-2300USA Department of Mathematics SUNY at BuffaloBuffaloNY14260-2900USA

In this paper,we consider high order multi-domain penalty spectral Galerkin methods for the approximation of hyperbolic conservation *** formulation has a penalty parameter which can vary in space and time,allowing for flexibility in the penalty *** flexibility is particularly advantageous for problems with an inhomogeneous *** show that the discontinuous Galerkin method is equivalent to the multi-domain spectral penalty Galerkin method with a particular value of the penalty *** penalty parameter has an effect on both the accuracy and stability of the *** examine the numerical issues which arise in the implementation of high order multi-domain penalty spectral Galerkin *** coefficient truncation method is proposed to prevent the rapid error growth due to round-off errors when high order polynomials are ***,we show that an inconsistent evaluation of the integrals in the penalty method may lead to growth of *** examples for linear and nonlinear problems are presented.

关键词： High order polynomial Galerkin methods penalty boundary conditions discontinuous Galerkin methods hyperbolic conservation laws round-off errors truncation methods

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A Strong Stability Preserving Analysis for Explicit Multistage Two-Derivative Time-Stepping Schemes Based on Taylor Series Conditions

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Communications on Applied Mathematics and Computation 2019年第1期1卷 21-59页

作者： Zachary Grant sigal Gottlieb David C.Seal Department of Computational and Applied Mathematics Oak Ridge National LaboratoryOak RidgeUSA Department of Mathematics University of Massachusetts DartmouthDartmouthUSA Department of Mathematics U.S.Naval AcademyAnnapolisUSA

High-order strong stability preserving(SSP)time discretizations are often needed to ensure the nonlinear(and sometimes non-inner-product)strong stability properties of spatial discretizations specially designed for the solution of hyperbolic ***-derivative time-stepping methods have recently been increasingly used for evolving hyperbolic PDEs,and the strong stability properties of these methods are of *** our prior work we explored time discretizations that preserve the strong stability properties of spatial discretizations coupled with forward Euler and a second-derivative ***,many spatial discretizations do not satisfy strong stability properties when coupled with this second-derivative formulation,but rather with a more natural Taylor series *** this work we demonstrate sufficient conditions for an explicit two-derivative multistage method to preserve the strong stability properties of spatial discretizations in a forward Euler and Taylor series *** call these strong stability preserving Taylor series(SSP-TS)*** also prove that the maximal order of SSP-TS methods is p=6,and define an optimization procedure that allows us to find such SSP *** types of these methods are presented and their efficiency ***,these methods are tested on several PDEs to demonstrate the benefit of SSP-TS methods,the need for the SSP property,and the sharpness of the SSP time-step in many cases.

关键词： Strong stability preserving Taylor series.Hyperbolic conservation laws Two derivative Runge Kutta

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Mucosa-associated microbiota alterations in primary sclerosing cholangitis(PSC)before and after liver transplantation-who is calling the shots?

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Hepatobiliary Surgery and Nutrition 2023年第5期12卷 795-797页

作者： Münevver Demir Michael sigal Department of Hepatology and Gastroenterology Campus Virchow-Klinikum and Campus CharitéMitteCharitéUniversitätsmedizin BerlinBerlinGermany Berlin Institute for Medical Systems Biology Max Delbrück Center for Molecular MedicineBerlinGermany

Primary sclerosing cholangitis(PSC)is an immune-related chronic cholangiopathy associated with high rates of progression to liver cirrhosis and the need for liver *** PSC is frequently associated with inflammatory bowel disease(IBD),several studies have investigated the role of the gut-liver axis in PSC and emerging evidence indicates that gut and bile microbiota are associated with the onset and progression of PSC[reviewed in(1)].

关键词： Primary sclerosing cholangitis(PSC) liver transplantation Klebsiella microbiota mucosal microbiota

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Bio-organic adaptive photonic crystals enable supramolecular solvatochromism

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Nano Research 2023年第10期16卷 12092-12097页

作者： Jiahao Zhang Yan Zhang Yancheng Wang sigal Rencus-Lazar Deqing Mei Ehud Gazit Kai Tao State Key Laboratory of Fluid Power and Mechatronic Systems School of Mechanical EngineeringZhejiang UniversityHangzhou 310027China Zhejiang-Israel Joint Laboratory of Self-Assembling Functional Materials Hangzhou Global Scientific and Technological Innovation CentreZhejiang UniversityHangzhou 311200China Key Laboratory of Advanced Manufacturing Technology of Zhejiang Province School of Mechanical EngineeringZhejiang UniversityHangzhou 310027China The Shmunis School of Biomedicine and Cancer Research George S.Wise Faculty of Life SciencesTel Aviv UniversityTel Aviv 6997801Israel Department of Materials Science and Engineering Iby and Aladar Fleischman Faculty of EngineeringTel Aviv UniversityTel Aviv 6997801Israel

Photonic crystals(PCs)exhibit promising structural coloration properties and possess extensive application prospects in diverse optical ***,state-of-the-art inorganic or polymeric PCs show limited adaptivity as their configurations are fixed once ***,bio-organic adaptive PCs are fabricated via drop-casting of amphiphilic guanine-based peptide nucleic acid selfassembled *** high formation activation energy of up to 81.8 kJ·mol−1 suggests that the self-assembly step dominates the entire ***,the configurations along with the structural coloration of the supramolecular PCs are sensitive to self-assembly influencing parameters,showing temperature-encoded structural color evolution and solvent polaritydependent *** findings demonstrate that the supramolecular PCs are adaptive,thus showing promising potential for detection of organic solvents of different polarities in a visual and real-time manner for environmental protection or optical applications.

关键词： peptide nucleic acids molecular manufacturing supramolecular photonic crystals solvatochromic effects adaptivity

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Treatment of gastric varices with partial splenic embolization in a patient with portal vein thrombosis and a myeloproliferative disorder

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World Journal of Gastroenterology 2014年第39期20卷 14495-14499页

作者： Robert Gianotti Hearns Charles Kenneth Hymes Hersh Chandarana Samuel sigal Beth Israel Deaconess Medical Center Harvard Medical School Boston MA 02215 United States New York University School of Medicine New York NY 10022 United States

Therapeutic options for gastric variceal bleeding in the presence of extensive portal vein thrombosis associated with a myeloproliferative disorder are *** report a case of a young woman who presented with gastric variceal bleeding secondary to extensive splanchnic venous thrombosis due to a Janus kinase 2 mutation associated myeloproliferative disorder that was managed effectively with partial splenic embolization.

关键词： Gastric varices Partial splenic embolization Myeloproliferative disorder Janus kinase 2 Portal hypertension Portal vein thrombosis

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