2,485 results found
    1. Computational and Systems Biology
    2. Neuroscience

    Probable nature of higher-dimensional symmetries underlying mammalian grid-cell activity patterns

    Alexander Mathis et al.
    Mathematical analysis confirms that hexagonal patterns of neuronal activity are the most efficient means for the brain to represent 2D space, and predicts that activity patterns resembling densely packed lattices are optimal for representing 3D space.
    1. Genetics and Genomics
    2. Microbiology and Infectious Disease

    Pyphe, a python toolbox for assessing microbial growth and cell viability in high-throughput colony screens

    Stephan Kamrad et al.
    An open-source python package for phenotype analyses provides a versatile, modular and user-friendly solution to determine complementary fitness-related traits from large-scale assays of microbial colonies.
    1. Ecology

    Rarity is a more reliable indicator of land-use impacts on soil invertebrate communities than other diversity metrics

    Andrew Dopheide et al.
    Rarity metrics reveal pervasive negative impacts of agricultural land use on soil invertebrate communities, whereas widely-used richness and diversity metrics underestimate the magnitude of these impacts.
    1. Biochemistry and Chemical Biology
    2. Cell Biology

    The multi-subunit GID/CTLH E3 ubiquitin ligase promotes cell proliferation and targets the transcription factor Hbp1 for degradation

    Fabienne Lampert et al.
    Proteomic, biochemical and cell-based analyses of the heterodecameric core GID/CTLH E3 ligase complex reveal its molecular architecture, activity determinants, and function in targeting the tumor suppressor Hbp1 and other substrates required for cell proliferation.
    1. Neuroscience

    Measurements and models of electric fields in the in vivo human brain during transcranial electric stimulation

    Yu Huang et al.
    Direct in-vivo measurements in the human brain test validity of detailed computational models of trancranial electric stimulation and show that electric fields in the brain are weaker than currently assumed.
    1. Computational and Systems Biology
    2. Neuroscience

    Fundamental bound on the persistence and capacity of short-term memory stored as graded persistent activity

    Onur Ozan Koyluoglu et al.
    A fundamental lower-bound on memory recall precision, which declines with storage duration and number of stored items, is derived, and human performance is shown to be well-fit by this theoretical bound.
    1. Neuroscience

    Framing of grid cells within and beyond navigation boundaries

    Francesco Savelli et al.
    Grid-cell maps can be aligned to both local and remote reference frames, suggesting that they provide a metric for space beyond the navigationally accessible boundaries of the local environment.
    1. Neuroscience

    A principle of economy predicts the functional architecture of grid cells

    Xue-Xin Wei et al.
    Mathematical modeling suggests that grid cells in the rodent brain use fundamental principles of number theory to maximize the efficiency of spatial mapping, enabling animals to accurately encode their location with as few neurons as possible.
    1. Neuroscience

    Extracting grid cell characteristics from place cell inputs using non-negative principal component analysis

    Yedidyah Dordek et al.
    Computational modeling of the brain’s navigation system reveals that place cells can drive the formation of hexagonal patterns experimentally observed in grid cells activity.
    1. Biochemistry and Chemical Biology

    Mitochondrial ClpX activates an essential biosynthetic enzyme through partial unfolding

    Julia R Kardon et al.
    The mitochondrial protein unfoldase ClpX activates the first enzyme in heme biosynthesis, ALAS, by targeted unfolding that gates access of cofactor to the ALAS active site.

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