13,085 research outputs found
Liquid micrurgy chamber and microsyringe designs allow more efficient micromanipulations
More efficient micromanipulations on large amoebae achieved by liquid micrurgy chamber and microsyringe. These innovations move the system closer to the specimen, and flatten the specimen for a clear view of the nuclei, also eliminating spherical abberation and evaporation
Stratification of centrifuged amoeba nuclei investigated by electron microscopy
Study establishes a relationship between radioresistance and the nucleolar stratification characteristics of various amoeba species. Two species of fresh water amoeba are studied with the electron microscope. The report discusses the nature of nucleolar layers and their possible relationship to the differences in radiosensitivity of the two amoeba species
An experimental investigation of the force network ensemble
We present an experiment in which a horizontal quasi-2D granular system with
a fixed neighbor network is cyclically compressed and decompressed over 1000
cycles. We remove basal friction by floating the particles on a thin air
cushion, so that particles only interact in-plane. As expected for a granular
system, the applied load is not distributed uniformly, but is instead
concentrated in force chains which form a network throughout the system. To
visualize the structure of these networks, we use particles made from
photoelastic material. The experimental setup and a new data-processing
pipeline allow us to map out the evolution subject to the cyclic compressions.
We characterize several statistical properties of the packing, including the
probability density function of the contact force, and compare them with
theoretical and numerical predictions from the force network ensemble theory.Comment: accepted for publication in the conference proceedings of Powders and
Grains 201
NEWS AND VIEWS FROM THE WESTERN RURAL DEVELOPMENT CENTER
Community/Rural/Urban Development,
Statistics of defect motion in spatiotemporal chaos in inclined layer convection
We report experiments on defect-tracking in the state of undulation chaos
observed in thermal convection of an inclined fluid layer. We characterize the
ensemble of defect trajectories according to their velocities, relative
positions, diffusion, and gain and loss rates. In particular, the defects
exhibit incidents of rapid transverse motion which result in power law
distributions for a number of quantitative measures. We examine connections
between this behavior and L\'evy flights and anomalous diffusion. In addition,
we describe time-reversal and system size invariance for defect creation and
annihilation rates.Comment: (21 pages, 17 figures
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