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  • 1
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    PopZ and PodJ polar localization in Agrobacterium [Microbiology] (2015)
    National Academy of Sciences
    Details
    Publication Date: 2015-09-16
    Description: Agrobacterium tumefaciens elongates by addition of peptidoglycan (PG) only at the pole created by cell division, the growth pole, whereas the opposite pole, the old pole, is inactive for PG synthesis. How Agrobacterium assigns and maintains pole asymmetry is not understood. Here, we investigated whether polar growth is correlated with...
    Print ISSN: 0027-8424
    Electronic ISSN: 1091-6490
    Topics: Biology , Medicine , Natural Sciences in General
    Published by National Academy of Sciences
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  • 2
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    Effects of nonequilibrium quasiparticles in a thin-film superconducting microwave resonator under optical illumination (2016)
    American Physical Society (APS)
    Details
    Publication Date: 2016-01-21
    Description: Author(s): R. P. Budoyo, J. B. Hertzberg, C. J. Ballard, K. D. Voigt, Z. Kim, J. R. Anderson, C. J. Lobb, and F. C. Wellstood We have illuminated a thin-film superconducting Al lumped-element microwave resonator with 780 nm light and observed the resonator quality factor and resonance frequency as a function of illumination and microwave power in the 20 to 300 mK temperature range. The optically induced microwave loss incr… [Phys. Rev. B 93, 024514] Published Tue Jan 19, 2016
    Keywords: Superfluidity and superconductivity
    Print ISSN: 1098-0121
    Electronic ISSN: 1095-3795
    Topics: Physics
    Published by American Physical Society (APS)
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  • 3
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    Spatiotemporal dynamics of neocortical excitation and inhibition during human sleep [Neuroscience] (2012)
    National Academy of Sciences
    Details
    Publication Date: 2012-02-01
    Description: Intracranial recording is an important diagnostic method routinely used in a number of neurological monitoring scenarios. In recent years, advancements in such recordings have been extended to include unit activity of an ensemble of neurons. However, a detailed functional characterization of excitatory and inhibitory cells has not been attempted in human neocortex, particularly during the sleep state. Here, we report that such feature discrimination is possible from high-density recordings in the neocortex by using 2D multielectrode arrays. Successful separation of regular-spiking neurons (or bursting cells) from fast-spiking cells resulted in well-defined clusters that each showed unique intrinsic firing properties. The high density of the array, which allowed recording from a large number of cells (up to 90), helped us to identify apparent monosynaptic connections, confirming the excitatory and inhibitory nature of regular-spiking and fast-spiking cells, thus categorized as putative pyramidal cells and interneurons, respectively. Finally, we investigated the dynamics of correlations within each class. A marked exponential decay with distance was observed in the case of excitatory but not for inhibitory cells. Although the amplitude of that decline depended on the timescale at which the correlations were computed, the spatial constant did not. Furthermore, this spatial constant is compatible with the typical size of human columnar organization. These findings provide a detailed characterization of neuronal activity, functional connectivity at the microcircuit level, and the interplay of excitation and inhibition in the human neocortex.
    Print ISSN: 0027-8424
    Electronic ISSN: 1091-6490
    Topics: Biology , Medicine , Natural Sciences in General
    Published by National Academy of Sciences
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  • 4
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    International congress of entomology (1990)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1990-10-19
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Anderson, J R -- Doyen, J T -- Hoy, M A -- Koehler, C -- Pipa, R L -- Andres, L A -- Haverty, M I -- Hoy, J B -- Knop, N F -- Ehrlich, P R -- Greenstone, M -- Plapp, F W Jr -- Shuping, Y -- New York, N.Y. -- Science. 1990 Oct 19;250(4979):360.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17793005" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 5
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    Regulatory role of parasites: impact on host population shifts with resource availability (1991)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1991-07-12
    Description: Effects of infections by the ciliate Lambornella clarki on larval populations of its mosquito host Aedes sierrensis were examined in laboratory and field studies. When host populations developed with sufficient food, mortality from parasites was additive and reduced the number of emerging mosquitoes. For food-limited populations, mortality was compensatory or depensatory; emerging adults were as or more abundant with higher average fitness than those from uninfected control populations. When nutrients were scarce, parasitic infections relaxed larval competition and increased per capita food by reducing host abundance. Food limitation altered larval feeding behavior, reducing horizontal transmission and subsequent mortality from parasitism.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Washburn, J O -- Mercer, D R -- Anderson, J R -- AI20245/AI/NIAID NIH HHS/ -- New York, N.Y. -- Science. 1991 Jul 12;253(5016):185-8.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Entomology, University of California, Berkeley 94720.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/1906637" target="_blank"〉PubMed〈/a〉
    Keywords: Aedes/*parasitology/physiology ; Animals ; Ciliophora/*physiology ; Ecology ; Population Dynamics ; Trees
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 6
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    Microcephalin, a gene regulating brain size, continues to evolve adaptively in humans (2005)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2005-09-10
    Description: The gene Microcephalin (MCPH1) regulates brain size and has evolved under strong positive selection in the human evolutionary lineage. We show that one genetic variant of Microcephalin in modern humans, which arose approximately 37,000 years ago, increased in frequency too rapidly to be compatible with neutral drift. This indicates that it has spread under strong positive selection, although the exact nature of the selection is unknown. The finding that an important brain gene has continued to evolve adaptively in anatomically modern humans suggests the ongoing evolutionary plasticity of the human brain. It also makes Microcephalin an attractive candidate locus for studying the genetics of human variation in brain-related phenotypes.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Evans, Patrick D -- Gilbert, Sandra L -- Mekel-Bobrov, Nitzan -- Vallender, Eric J -- Anderson, Jeffrey R -- Vaez-Azizi, Leila M -- Tishkoff, Sarah A -- Hudson, Richard R -- Lahn, Bruce T -- New York, N.Y. -- Science. 2005 Sep 9;309(5741):1717-20.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Howard Hughes Medical Institute, Department of Human Genetics, University of Chicago, Chicago, IL 60637, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/16151009" target="_blank"〉PubMed〈/a〉
    Keywords: Adaptation, Biological ; African Continental Ancestry Group/genetics ; Alleles ; Amino Acid Substitution ; Asian Continental Ancestry Group/genetics ; *Biological Evolution ; Brain/*anatomy & histology/physiology ; European Continental Ancestry Group/genetics ; Exons ; Gene Conversion ; Gene Frequency ; Genetic Variation ; Genotype ; Haplotypes ; Humans ; Linkage Disequilibrium ; Microcephaly/genetics ; Nerve Tissue Proteins/*genetics ; Organ Size ; Polymorphism, Genetic ; Recombination, Genetic ; *Selection, Genetic ; Sequence Analysis, DNA ; Time
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 7
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    Entangled macroscopic quantum States in two superconducting qubits (2003)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2003-05-17
    Description: We present spectroscopic evidence for the creation of entangled macroscopic quantum states in two current-biased Josephson-junction qubits coupled by a capacitor. The individual junction bias currents are used to control the interaction between the qubits by tuning the energy level spacings of the junctions in and out of resonance with each other. Microwave spectroscopy in the 4 to 6 gigahertzrange at 20 millikelvin reveals energy levels that agree well with theoretical results for entangled states. The single qubits are spatially separate, and the entangled states extend over the 0.7-millimeter distance between the two qubits.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Berkley, A J -- Xu, H -- Ramos, R C -- Gubrud, M A -- Strauch, F W -- Johnson, P R -- Anderson, J R -- Dragt, A J -- Lobb, C J -- Wellstood, F C -- New York, N.Y. -- Science. 2003 Jun 6;300(5625):1548-50. Epub 2003 May 15.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Center for Superconductivity Research, Department of Physics, University of Maryland, College Park, MD 20742, USA. berkley@physics.umd.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/12750479" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 8
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    Ongoing adaptive evolution of ASPM, a brain size determinant in Homo sapiens (2005)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2005-09-10
    Description: The gene ASPM (abnormal spindle-like microcephaly associated) is a specific regulator of brain size, and its evolution in the lineage leading to Homo sapiens was driven by strong positive selection. Here, we show that one genetic variant of ASPM in humans arose merely about 5800 years ago and has since swept to high frequency under strong positive selection. These findings, especially the remarkably young age of the positively selected variant, suggest that the human brain is still undergoing rapid adaptive evolution.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Mekel-Bobrov, Nitzan -- Gilbert, Sandra L -- Evans, Patrick D -- Vallender, Eric J -- Anderson, Jeffrey R -- Hudson, Richard R -- Tishkoff, Sarah A -- Lahn, Bruce T -- New York, N.Y. -- Science. 2005 Sep 9;309(5741):1720-2.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Howard Hughes Medical Institute, Department of Human Genetics, University of Chicago, Chicago, IL 60637, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/16151010" target="_blank"〉PubMed〈/a〉
    Keywords: Adaptation, Biological ; African Continental Ancestry Group ; Animals ; Asian Continental Ancestry Group/genetics ; *Biological Evolution ; Brain/*anatomy & histology/physiology ; European Continental Ancestry Group ; Gene Conversion ; Gene Frequency ; Genotype ; Haplotypes ; Humans ; Linkage Disequilibrium ; Models, Genetic ; Nerve Tissue Proteins/*genetics ; Organ Size ; Pan troglodytes/genetics ; Phylogeny ; Polymorphism, Genetic ; Recombination, Genetic ; *Selection, Genetic ; Sequence Analysis, DNA ; Time
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 9
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    The microwave Hall effect measured using a waveguide tee (2016)
    American Institute of Physics (AIP)
    Details
    Publication Date: 2016-03-11
    Description: This paper describes a simple microwave apparatus to measure the Hall effect in semiconductor wafers. The advantage of this technique is that it does not require contacts on the sample or the use of a resonant cavity. Our method consists of placing the semiconductor wafer into a slot cut in an X-band (8–12 GHz) waveguide series tee, injecting microwave power into the two opposite arms of the tee, and measuring the microwave output at the third arm. A magnetic field applied perpendicular to the wafer gives a microwave Hall signal that is linear in the magnetic field and which reverses phase when the magnetic field is reversed. The microwave Hall signal is proportional to the semiconductor mobility, which we compare for calibration purposes with d.c. mobility measurements obtained using the van der Pauw method. We obtain the resistivity by measuring the microwave reflection coefficient of the sample. This paper presents data for silicon and germanium samples doped with boron or phosphorus. The measured mobilities ranged from 270 to 3000 cm 2 / (V s).
    Print ISSN: 0021-8979
    Electronic ISSN: 1089-7550
    Topics: Physics
    Published by American Institute of Physics (AIP)
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  • 10
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    Predator-induced trophic shift of a free-living ciliate: parasitism of mosquito larvae by their prey (1988)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1988-05-27
    Description: Larvae of the treehole mosquito, Aedes sierrensis, release a waterborne factor that induces morphogenesis of one of their prey, the tetrahymenid ciliate Lambornella clarki. Induced free-living trophonts of L. clarki undergo a synchronous response in which cells divide and transform into parasitic cells (theronts) that encyst on larval predators. Parasitic ciliates penetrate the cuticle, enter the hemocoel, and ultimately kill their predator-host. In nature, this trophic shift can lead to predator extinction and dramatic changes in microbial populations. Facultative parasitism by this polymorphic ciliate may have evolved as an antipredator strategy. The experimentally inducible parasitic response of L. clarki provides a novel model for studying cellular morphogenesis of ciliated protozoa.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Washburn, J O -- Gross, M E -- Mercer, D R -- Anderson, J R -- AI20245/AI/NIAID NIH HHS/ -- New York, N.Y. -- Science. 1988 May 27;240(4856):1193-5.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Entomological Sciences, University of California, Berkely 94720.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/3131877" target="_blank"〉PubMed〈/a〉
    Keywords: Aedes/*parasitology/physiology ; Animals ; Ciliophora/growth & development/*physiology ; Ecology ; Larva ; Predatory Behavior
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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