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  • Articles  (6)
  • American Association for the Advancement of Science (AAAS)  (5)
  • Copernicus  (1)
  • Ramat-Gan: Bar-Ilan University, Department of Economics
  • 2010-2014  (6)
  • 2011  (6)
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  • Articles  (6)
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  • 2010-2014  (6)
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  • 1
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    Interconversion between intestinal stem cell populations in distinct niches (2011)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2011-11-15
    Description: Intestinal epithelial stem cell identity and location have been the subject of substantial research. Cells in the +4 niche are slow-cycling and label-retaining, whereas a different stem cell niche located at the crypt base is occupied by crypt base columnar (CBC) cells. CBCs are distinct from +4 cells, and the relationship between them is unknown, though both give rise to all intestinal epithelial lineages. We demonstrate that Hopx, an atypical homeobox protein, is a specific marker of +4 cells. Hopx-expressing cells give rise to CBCs and all mature intestinal epithelial lineages. Conversely, CBCs can give rise to +4 Hopx-positive cells. These findings demonstrate a bidirectional lineage relationship between active and quiescent stem cells in their niches.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3705713/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3705713/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Takeda, Norifumi -- Jain, Rajan -- LeBoeuf, Matthew R -- Wang, Qiaohong -- Lu, Min Min -- Epstein, Jonathan A -- R01 HL071546/HL/NHLBI NIH HHS/ -- U01 HL100405/HL/NHLBI NIH HHS/ -- New York, N.Y. -- Science. 2011 Dec 9;334(6061):1420-4. doi: 10.1126/science.1213214. Epub 2011 Nov 10.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Cell and Developmental Biology, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, PA 19104, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/22075725" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Cell Cycle ; Cell Differentiation ; Cell Lineage ; Cell Proliferation ; Cells, Cultured ; Epithelial Cells/*cytology ; Homeodomain Proteins/analysis/genetics ; Intestinal Mucosa/*cytology/drug effects ; Intestine, Small/*cytology/drug effects ; Mice ; Models, Biological ; Multipotent Stem Cells/*cytology/physiology ; Paneth Cells/cytology ; *Stem Cell Niche ; Tamoxifen/pharmacology
    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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  • 2
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    Tomography of reaction-diffusion microemulsions reveals three-dimensional Turing patterns (2011)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2011-02-12
    Description: Spatially periodic, temporally stationary patterns that emerge from instability of a homogeneous steady state were proposed by Alan Turing in 1952 as a mechanism for morphogenesis in living systems and have attracted increasing attention in biology, chemistry, and physics. Patterns found to date have been confined to one or two spatial dimensions. We used tomography to study the Belousov-Zhabotinsky reaction in a microemulsion in which the polar reactants are confined to aqueous nanodroplets much smaller than the scale of the stationary patterns. We demonstrate the existence of Turing patterns that can exist only in three dimensions, including curved surfaces, hexagonally packed cylinders, spots, and labyrinthine and lamellar patterns.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Bansagi, Tamas Jr -- Vanag, Vladimir K -- Epstein, Irving R -- New York, N.Y. -- Science. 2011 Mar 11;331(6022):1309-12. doi: 10.1126/science.1200815. Epub 2011 Feb 10.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Chemistry, Brandeis University, Waltham, MA 02454, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/21310963" 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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  • 3
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    Competencies: a cure for pre-med curriculum (2011)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2011-11-15
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Anderson, Winston A -- Amasino, Richard M -- Ares, Manuel Jr -- Banerjee, Utpal -- Bartel, Bonnie -- Corces, Victor G -- Drennan, Catherine L -- Elgin, Sarah C R -- Epstein, Irving R -- Fanning, Ellen -- Guillette, Louis J Jr -- Handelsman, Jo -- Hatfull, Graham F -- Hoy, Ronald Raymond -- Kelley, Darcy -- Leinwand, Leslie A -- Losick, Richard -- Lu, Yi -- Lynn, David G -- Neuhauser, Claudia -- O'Dowd, Diane K -- Olivera, Toto -- Pevzner, Pavel -- Richards-Kortum, Rebecca R -- Rine, Jasper -- Sah, Robert L -- Strobel, Scott A -- Walker, Graham C -- Walt, David R -- Warner, Isiah M -- Wessler, Sue -- Willard, Huntington F -- Zare, Richard N -- New York, N.Y. -- Science. 2011 Nov 11;334(6057):760-1. doi: 10.1126/science.334.6057.760-b.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/22076362" target="_blank"〉PubMed〈/a〉
    Keywords: *Curriculum ; *Education, Premedical ; *Educational Status ; *School Admission Criteria ; *Schools, Medical ; Universities
    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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  • 4
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    Science education. Changing the culture of science education at research universities (2011)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2011-01-15
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Anderson, W A -- Banerjee, U -- Drennan, C L -- Elgin, S C R -- Epstein, I R -- Handelsman, J -- Hatfull, G F -- Losick, R -- O'Dowd, D K -- Olivera, B M -- Strobel, S A -- Walker, G C -- Warner, I M -- New York, N.Y. -- Science. 2011 Jan 14;331(6014):152-3. doi: 10.1126/science.1198280.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Howard University, Washington, DC 20059, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/21233371" target="_blank"〉PubMed〈/a〉
    Keywords: *Academies and Institutes ; *Faculty ; Interdisciplinary Communication ; *Research ; Research Support as Topic ; Science/*education ; *Teaching ; *Universities
    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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    Live attenuated malaria vaccine designed to protect through hepatic CD8(+) T cell immunity (2011)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2011-09-10
    Description: Our goal is to develop a vaccine that sustainably prevents Plasmodium falciparum (Pf) malaria in 〉/=80% of recipients. Pf sporozoites (PfSPZ) administered by mosquito bites are the only immunogens shown to induce such protection in humans. Such protection is thought to be mediated by CD8(+) T cells in the liver that secrete interferon-gamma (IFN-gamma). We report that purified irradiated PfSPZ administered to 80 volunteers by needle inoculation in the skin was safe, but suboptimally immunogenic and protective. Animal studies demonstrated that intravenous immunization was critical for inducing a high frequency of PfSPZ-specific CD8(+), IFN-gamma-producing T cells in the liver (nonhuman primates, mice) and conferring protection (mice). Our results suggest that intravenous administration of this vaccine will lead to the prevention of infection with Pf malaria.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Epstein, J E -- Tewari, K -- Lyke, K E -- Sim, B K L -- Billingsley, P F -- Laurens, M B -- Gunasekera, A -- Chakravarty, S -- James, E R -- Sedegah, M -- Richman, A -- Velmurugan, S -- Reyes, S -- Li, M -- Tucker, K -- Ahumada, A -- Ruben, A J -- Li, T -- Stafford, R -- Eappen, A G -- Tamminga, C -- Bennett, J W -- Ockenhouse, C F -- Murphy, J R -- Komisar, J -- Thomas, N -- Loyevsky, M -- Birkett, A -- Plowe, C V -- Loucq, C -- Edelman, R -- Richie, T L -- Seder, R A -- Hoffman, S L -- 5R44AI055229-07/AI/NIAID NIH HHS/ -- 5R44AI058375-05/AI/NIAID NIH HHS/ -- 5R44AI058499-05/AI/NIAID NIH HHS/ -- Howard Hughes Medical Institute/ -- New York, N.Y. -- Science. 2011 Oct 28;334(6055):475-80. doi: 10.1126/science.1211548. Epub 2011 Sep 8.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉U.S. Military Malaria Vaccine Program, Naval Medical Research Center, Silver Spring, MD 20910, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/21903775" target="_blank"〉PubMed〈/a〉
    Keywords: Adolescent ; Adult ; Animals ; Antibodies, Protozoan/blood/immunology ; Antigens, Protozoan/immunology ; CD8-Positive T-Lymphocytes/*immunology ; Humans ; Injections, Intravenous ; Injections, Subcutaneous ; Interferon-gamma/biosynthesis/immunology ; Liver/*immunology ; Macaca mulatta ; Malaria Vaccines/administration & dosage/adverse effects/*immunology ; Malaria, Falciparum/*prevention & control ; Mice ; Middle Aged ; Plasmodium falciparum/*immunology ; Rabbits ; Sporozoites/*immunology ; Vaccines, Attenuated/administration & dosage/adverse effects/immunology ; Young Adult
    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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    A two-dimensional volatility basis set: 1. organic-aerosol mixing thermodynamics (2011)
    Copernicus
    Details
    Publication Date: 2011-04-07
    Description: We develop the thermodynamic underpinnings of a two-dimensional volatility basis set (2D-VBS) employing saturation mass concentration (Co) and the oxygen content (O:C) to describe volatility, mixing thermodynamics, and chemical evolution of organic aerosol. The work addresses a simple question: "Can we reasonably constrain organic-aerosol composition in the atmosphere based on only two measurable organic properties, volatility and the extent of oxygenation?" This is an extension of our earlier one-dimensional approach employing volatility only (C* = γ Co, where γ is an activity coefficient). Using available constraints on bulk organic-aerosol composition, we argue that one can reasonably predict the composition of organics (carbon, oxygen and hydrogen numbers) given a location in the Co – O:C space. Further, we argue that we can constrain the activity coefficients at various locations in this space based on the O:C of the organic aerosol.
    Print ISSN: 1680-7316
    Electronic ISSN: 1680-7324
    Topics: Geosciences
    Published by Copernicus on behalf of European Geosciences Union.
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