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arXiv (509,308 recursos)
This is one of the most extensive subject based repositories in the world in the field of physics, mathematics, astronomy, computer sciences and quantitative biology. This is the principal site with almost 20 mirror versions around the globe. The site is supported by an extensive collection of information and background documentation. An RSS feed is available for anyone interested in keeping up-to-date with newly added materials.

Mostrando recursos 61 - 80 de 4,680

61. Extraclassical receptive field phenomena & short-range connectivity in V1 - Wielaard, Jim; Sajda, Paul
We address two such phenomena: surround suppression and contrast dependent receptive field size.

62. Modeling multi-cellular systems using sub-cellular elements - Newman, T. J.
We introduce a model for describing the dynamics of large numbers of interacting cells.

63. Geometric and physical considerations for realistic protein models - Hubner, Isaac A.; Shakhnovich, Eugene I.
Protein structure is generally conceptualized as the global arrangement or of smaller, local motifs of helices, sheets, and loops.

64. Features and dimensions: Motion estimation in fly vision - Bialek, William; van Steveninck, Rob R. de Ruyter
We characterize the computation of motion in the fly visual system as a mapping from the high dimensional space of signals in the retinal photodetector array to the probability of generating an action potential in a motion sensitive neuron.

65. Noise-enhanced computation in a model of a cortical column - Mayor, Julien; Gerstner, Wulfram
It has been conjectured in the literature that this effect, known as stochastic resonance, may take place in central cognitive processes such as the memory retrieval of arithmetical multiplication.

66. Wiring cost in the organization of a biological network - Ahn, Yong-Yeol; Kim, Beom Jun; Jeong, Hawoong
To find out the role of the wiring cost in the organization of the neural network of the nematode \textit{Caenorhapditis elegans} (\textit{C.

67. Simulation of geographical trends in Chowdhury ecosystem model - Rohde, Klaus; Stauffer, Dietrich
Complexity of foodwebs increases with time and at a higher rate at low latitudes, and there is a higher rate of species creation at low latitudes.

68. Diversity as a product of interspecial interactions - Lawson, Daniel; Jensen, Henrik Jeldtoft; Kaneko, Kunihiko
We demonstrate diversification rather than optimisation for highly interacting organisms in a well mixed biological system by means of a simple model and reference to experiment, and find the cause to be the complex network of interactions formed, allowing species less well adapted to an environment to flourish by co-interaction over the `best' species.

69. A Predation Behavior Model Based on Game Theory - Chen, Shi; Bao, Sheng; Yan, Ling; Huang, Cheng
This article adopts game theory to build a model for explaining the predation behavior of animals.We assume that both the prey and the preydator have two stratigies in this game,the active one and the passive one.By calculating the outcome and the income of energy in different stratigies, we find the solution to analyze the different evolution path of both the prey and the predator.A simulation result approximately represents the correctness of our model.

70. Combinatorial rules of icosahedral capsid growth - Kerner, Richard
A model of growth of icosahedral viral capsids is proposed.

71. Traveling wave solutions of Fitzhugh model with cross-diffusion - Berezovskaya, F.; Camacho, E.; Wirkus, S.; Karev, G.
In this paper, we utilize a modified version of the Fitzhugh-Nagumo equations to model the spatial propagation of neuron firing; we assume that this propagation is (at least, partially) caused by the cross-diffusion connection between the potential and recovery variables.

72. Dynamics of inhomogeneous populations and global demography models - Karev, Georgy P.
The dynamic theory of inhomogeneous populations developed during the last decade predicts several essential new dynamic regimes applicable even to the well-known, simple population models.

73. Spatial dynamics of homochiralization - Multamaki, Tuomas; Brandenburg, Axel
The emergence and spreading of chirality on the early Earth is considered by studying a set of reaction-diffusion equations based on a polymerization model.

74. Gene & Genome Duplication in Acanthamoeba Polyphaga Mimivirus - Suhre, Karsten
Gene duplication is key to molecular evolution in all three domains of life and may be the first step in the emergence of new gene function.

75. Maximum Likelihood Jukes-Cantor Triplets: Analytic Solutions - Chor, Benny; Hendy, Michael D.; Snir, Sagi
Complex systems of polynomial equations have to be set up and solved algebraically in order to obtain analytic solutions for maximum likelihood on phylogenetic trees.

76. Error thresholds in a mutation-selection model with Hopfield-type fitness - Garske, Tini
Mutation is modelled as a Markov process, fitness functions are of Hopfield type, where the fitness of a sequence is determined by the Hamming distances to a number of predefined patterns.

77. Mesoscopic modeling for nucleic acid chain dynamics - Sales-Pardo, M.; Guimera, R.; Moreira, A. A.; Widom, J.; Amaral, L. A. N.
As a step toward this aim, we present here a novel mesoscopic-level computational model that provides a new window into nucleic acid dynamics.

78. Robustness and Evolvability of the B Cell Mutator Mechanism - Theodosopoulos, Patricia; Theodosopoulos, Ted
We present a model that considers the maturation of the antibody population following primary antigen presentation as a global optimization problem.

79. Giant viruses in the oceans : the 4th Algal Virus Workshop - Claverie, Jean-Michel
Giant double-stranded DNA viruses (such as record breaking Acanthamoeba polyphaga Mimivirus), with particle sizes of 0.2 to 0.6 micron, genomes of 300 kbp to 1.200 kbp, and commensurate complex gene contents, constitute an evolutionary mystery.

80. Mutation model for nucleotide sequences based on crystal basis - Minichini, C.; Sciarrino, A.
A master equation for the distribution function is written, where the intensity of the one-spin flip is assumed to depend from the variation of the labels of the state.

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