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  • 1
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    Shear-reversible crystallization [Applied Physical Sciences] (2013)
    National Academy of Sciences
    Details
    Publication Date: 2013-09-11
    Description: We demonstrate a unique shear-induced crystallization phenomenon above the equilibrium freezing temperature in weakly swollen isotropic and lamellar mesophases with bilayers formed in a cationic-anionic mixed surfactant system. Synchrotron rheological X-ray diffraction study reveals the crystallization transition to be reversible under shear (i.e., on stopping the shear, the nonequilibrium crystalline...
    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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    Acid solvation versus dissociation at "stardust conditions": Reaction sequence matters (2019)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2019
    Description: 〈p〉Chemical reactions at ultralow temperatures are of fundamental importance to primordial molecular evolution as it occurs on icy mantles of dust nanoparticles or on ultracold water clusters in dense interstellar clouds. As we show, studying reactions in a stepwise manner in ultracold helium nanodroplets by mass-selective infrared (IR) spectroscopy provides an avenue to mimic these "stardust conditions" in the laboratory. In our joint experimental/theoretical study, in which we successively add H〈sub〉2〈/sub〉O molecules to HCl, we disclose a unique IR fingerprint at 1337 cm〈sup〉–1〈/sup〉 that heralds hydronium (H〈sub〉3〈/sub〉O〈sup〉+〈/sup〉) formation and, thus, acid dissociation generating solvated protons. In stark contrast, no reaction is observed when reversing the sequence by allowing HCl to interact with preformed small embryonic ice-like clusters. Our ab initio simulations demonstrate that not only reaction stoichiometry but also the reaction sequence needs to be explicitly considered to rationalize ultracold chemistry.〈/p〉
    Electronic ISSN: 2375-2548
    Topics: Natural Sciences in General
    Published by American Association for the Advancement of Science (AAAS)
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  • 3
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    An index of topological preservation for feature extraction (1995)
    Elsevier
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    Publication Date: 1995-03-01
    Print ISSN: 0031-3203
    Electronic ISSN: 1873-5142
    Topics: Computer Science
    Published by Elsevier
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  • 4
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    CD14 cooperates with complement receptor 3 to mediate MyD88-independent phagocytosis of Borrelia burgdorferi [Immunology] (2012)
    National Academy of Sciences
    Details
    Publication Date: 2012-01-25
    Description: Phagocytosis of Borrelia burgdorferi, the causative agent of Lyme disease, is a poorly understood process, despite its importance during the host immune response to infection. B. burgdorferi has been shown to bind to different receptors on the surface of phagocytic cells, including the β2 integrin, complement receptor 3 (CR3). However, whether these receptors mediate the phagocytosis of the spirochete remains unknown. We now demonstrate that CR3 mediates the phagocytosis of the spirochete by murine macrophages and human monocytes. Interaction of B. burgdorferi with the integrin is not sufficient, however, to internalize the spirochete; phagocytosis requires the interaction of CR3 with the GPI-anchored protein, CD14, independently of TLR/MyD88-induced or inside-out signals. Interestingly, the absence of CR3 leads to marked increases in the production of TNF in vitro and in vivo, despite reduced spirochetal uptake. Furthermore, the absence of CR3 during infection with B. burgdorferi results in the inefficient control of bacterial burdens in the heart and increased Lyme carditis. Overall, our data identify CR3 as a MyD88-independent phagocytic receptor for B. burgdorferi that also participates in the modulation of the proinflammatory output of macrophages. These data also establish a unique mechanism of CR3-mediated phagocytosis that requires the direct cooperation of GPI-anchored proteins.
    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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  • 5
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    Association analysis using next-generation sequence data from publicly available control groups: the robust variance score statistic (2014)
    Oxford University Press
    Details
    Publication Date: 2014-07-19
    Description: Motivation: Sufficiently powered case–control studies with next-generation sequence (NGS) data remain prohibitively expensive for many investigators. If feasible, a more efficient strategy would be to include publicly available sequenced controls. However, these studies can be confounded by differences in sequencing platform; alignment, single nucleotide polymorphism and variant calling algorithms; read depth; and selection thresholds. Assuming one can match cases and controls on the basis of ethnicity and other potential confounding factors, and one has access to the aligned reads in both groups, we investigate the effect of systematic differences in read depth and selection threshold when comparing allele frequencies between cases and controls. We propose a novel likelihood-based method, the robust variance score (RVS), that substitutes genotype calls by their expected values given observed sequence data. Results: We show theoretically that the RVS eliminates read depth bias in the estimation of minor allele frequency. We also demonstrate that, using simulated and real NGS data, the RVS method controls Type I error and has comparable power to the ‘gold standard’ analysis with the true underlying genotypes for both common and rare variants. Availability and implementation: An RVS R script and instructions can be found at strug.research.sickkids.ca , and at https://github.com/strug-lab/RVS . Contact: lisa.strug@utoronto.ca Supplementary information: Supplementary data are available at Bioinformatics online.
    Print ISSN: 1367-4803
    Electronic ISSN: 1460-2059
    Topics: Biology , Computer Science , Medicine
    Published by Oxford University Press
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  • 6
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    Unsung hero Robert C. Gallo (2009)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2009-01-10
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Abbadessa, Giovanni -- Accolla, Roberto -- Aiuti, Fernando -- Albini, Adriana -- Aldovini, Anna -- Alfano, Massimo -- Antonelli, Guido -- Bartholomew, Courtenay -- Bentwich, Zvi -- Bertazzoni, Umberto -- Berzofsky, Jay A -- Biberfeld, Peter -- Boeri, Enzo -- Buonaguro, Luigi -- Buonaguro, Franco M -- Bukrinsky, Michael -- Burny, Arsene -- Caruso, Arnaldo -- Cassol, Sharon -- Chandra, Prakash -- Ceccherini-Nelli, Luca -- Chieco-Bianchi, Luigi -- Clerici, Mario -- Colombini-Hatch, Sandra -- de Giuli Morghen, Carlo -- de Maria, Andrea -- de Rossi, Anita -- Dierich, Manfred -- Della-Favera, Riccardo -- Dolei, Antonina -- Douek, Daniel -- Erfle, Volker -- Felber, Barbara -- Fiorentini, Simona -- Franchini, Genoveffa -- Gershoni, Jonathan M -- Gotch, Frances -- Green, Patrick -- Greene, Warner C -- Hall, William -- Haseltine, William -- Jacobson, Stephens -- Kallings, Lars O -- Kalyanaraman, Vaniambadi S -- Katinger, Hermann -- Khalili, Kamel -- Klein, George -- Klein, Eva -- Klotman, Mary -- Klotman, Paul -- Kotler, Moshe -- Kurth, Reinhard -- Lafeuillade, Alain -- La Placa, Michelangelo -- Lewis, Jonathan -- Lillo, Flavia -- Lisziewicz, Julianna -- Lomonico, Anita -- Lopalco, Lucia -- Lori, Franco -- Lusso, Paolo -- Macchi, Beatrice -- Malim, Michael -- Margolis, Leonid -- Markham, Phillip D -- McClure, Myra -- Miller, Nancy -- Mingari, Maria C -- Moretta, Lorenzo -- Noonan, Douglas -- O'Brien, Steve -- Okamoto, Takashi -- Pal, Ranajit -- Palese, Peter -- Panet, Amos -- Pantaleo, Giuseppe -- Pavlakis, George -- Pistello, Mauro -- Plotkin, Stanley -- Poli, Guido -- Pomerantz, Roger -- Radaelli, Antonia -- Robertguroff, Marjorie -- Roederer, Mario -- Sarngadharan, Mangalasseril G -- Schols, Dominique -- Secchiero, Paola -- Shearer, Gene -- Siccardi, Antonio -- Stevenson, Mario -- Svoboda, Jan -- Tartaglia, Jim -- Torelli, Giuseppe -- Tornesello, Maria Lina -- Tschachler, Erwin -- Vaccarezza, Mauro -- Vallbracht, Angelika -- van Lunzen, Jan -- Varnier, Oliviero -- Vicenzi, Elisa -- von Melchner, Harald -- Witz, Isaac -- Zagury, Daniel -- Zagury, Jean-Francois -- Zauli, Giorgio -- Zipeto, Donato -- New York, N.Y. -- Science. 2009 Jan 9;323(5911):206-7. doi: 10.1126/science.323.5911.206.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/19131607" target="_blank"〉PubMed〈/a〉
    Keywords: Acquired Immunodeficiency Syndrome/diagnosis/*history/virology ; *HIV-1/growth & development/isolation & purification ; History, 20th Century ; History, 21st Century ; Humans ; *Nobel Prize ; United States
    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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    Inhibition of HIV-1 infection by the beta-chemokine MDC (1997)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1997-10-24
    Description: CD8(+) T lymphocytes from individuals infected with human immunodeficiency virus-type 1 (HIV-1) secrete a soluble activity that suppresses infection by HIV-1. A protein associated with this activity was purified from the culture supernatant of an immortalized CD8(+) T cell clone and identified as the beta-chemokine macrophage-derived chemokine (MDC). MDC suppressed infection of CD8(+) cell-depleted peripheral blood mononuclear cells by primary non-syncytium-inducing and syncytium-inducing isolates of HIV-1 and the T cell line-adapted isolate HIV-1IIIB. MDC was expressed in activated, but not resting, peripheral blood mononuclear cells and binds a receptor on activated primary T cells. These observations indicate that beta-chemokines are responsible for a major proportion of HIV-1-specific suppressor activity produced by primary T cells.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Pal, R -- Garzino-Demo, A -- Markham, P D -- Burns, J -- Brown, M -- Gallo, R C -- DeVico, A L -- N01-AI-55279/AI/NIAID NIH HHS/ -- New York, N.Y. -- Science. 1997 Oct 24;278(5338):695-8.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Advanced BioScience Laboratories, 5510 Nicholson Lane, Kensington, MD 20895, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9381181" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Antiviral Agents/*immunology ; Blotting, Northern ; CD8-Positive T-Lymphocytes/*immunology ; Calcium/blood ; Cell Line ; Cell Line, Transformed ; Cells, Cultured ; Chemokine CCL22 ; Chemokines, CC/chemistry/*immunology/isolation & purification/metabolism ; HIV Core Protein p24/biosynthesis ; HIV Infections/immunology ; HIV-1/*immunology/physiology ; Humans ; Leukocytes, Mononuclear/immunology/metabolism/*virology ; Lymphocyte Activation ; Receptors, Chemokine/metabolism ; Receptors, HIV/metabolism ; T-Lymphocytes/immunology
    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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  • 8
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    Indispensability of Horizontally Transferred Genes and Its Impact on Bacterial Genome Streamlining (2016)
    Oxford University Press
    Details
    Publication Date: 2016-04-22
    Description: Why are certain bacterial genomes so small and compact? The adaptive genome streamlining hypothesis posits that selection acts to reduce genome size because of the metabolic burden of replicating DNA. To reveal the impact of genome streamlining on cellular traits, we reduced the Escherichia coli genome by up to 20% by deleting regions which have been repeatedly subjects of horizontal transfer in nature. Unexpectedly, horizontally transferred genes not only confer utilization of specific nutrients and elevate tolerance to stresses, but also allow efficient usage of resources to build new cells, and hence influence fitness in routine and stressful environments alike. Genome reduction affected fitness not only by gene loss, but also by induction of a general stress response. Finally, we failed to find evidence that the advantage of smaller genomes would be due to a reduced metabolic burden of replicating DNA or a link with smaller cell size. We conclude that as the potential energetic benefit gained by deletion of short genomic segments is vanishingly small compared with the deleterious side effects of these deletions, selection for reduced DNA synthesis costs is unlikely to shape the evolution of small genomes.
    Print ISSN: 0737-4038
    Electronic ISSN: 1537-1719
    Topics: Biology
    Published by Oxford University Press
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  • 9
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    FARAO: the flexible all-round annotation organizer (2016)
    Oxford University Press
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    Publication Date: 2016-11-30
    Description: : With decreasing costs of generating DNA sequence data, genome and metagenome projects have become accessible to a wider scientific community. However, to extract meaningful information and visualize the data remain challenging. We here introduce FARAO, a highly scalable software for organization, visualization and integration of annotation and read coverage data that can also combine output data from several bioinformatics tools. The capabilities of FARAO can greatly aid analyses of genomic and metagenomic datasets. Availability and Implementation: FARAO is implemented in Perl and is supported under Unix-like operative systems, including Linux and macOS. The Perl source code is freely available for download under the MIT License from http://microbiology.se/software/farao/ . Contact: johan.bengtsson-palme@microbiology.se Supplementary information: Supplementary data are available at Bioinformatics online.
    Print ISSN: 1367-4803
    Electronic ISSN: 1460-2059
    Topics: Biology , Computer Science , Medicine
    Published by Oxford University Press
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  • 10
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    The Kepler Cepheid V1154 Cyg revisited: light curve modulation and detection of granulation (2016)
    Oxford University Press
    Details
    Publication Date: 2016-10-28
    Description: We present a detailed analysis of the bright Cepheid-type variable star V1154 Cygni using 4 yr of continuous observations by the Kepler space telescope. We detected 28 frequencies using the standard Fourier transform method. We identified modulation of the main pulsation frequency and its harmonics with a period of ~159 d. This modulation is also present in the Fourier parameters of the light curve and the O – C diagram. We detected another modulation with a period of about 1160 d. The star also shows significant power in the low-frequency region that we identified as granulation noise. The effective time-scale of the granulation agrees with the extrapolated scalings of red giant stars. Non-detection of solar-like oscillations indicates that the pulsation inhibits other oscillations. We obtained new radial velocity observations that are in a perfect agreement with previous years data, suggesting that there is no high-mass star companion of V1154 Cygni. Finally, we discuss the possible origin of the detected frequency modulations.
    Print ISSN: 0035-8711
    Electronic ISSN: 1365-2966
    Topics: Physics
    Published by Oxford University Press
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