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  • Articles  (28)
  • 2015-2019  (11)
  • 1985-1989  (17)
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  • Books
  • Articles  (28)
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  • 1
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    A rights revolution for nature (2019)
    American Association for the Advancement of Science (AAAS)
    In: Science
    Details
    Publication Date: 2019
    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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  • 2
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    Probing the ultimate plasmon confinement limits with a van der Waals heterostructure (2018)
    American Association for the Advancement of Science (AAAS)
    In: Science
    Details
    Publication Date: 2018-04-20
    Description: The ability to confine light into tiny spatial dimensions is important for applications such as microscopy, sensing, and nanoscale lasers. Although plasmons offer an appealing avenue to confine light, Landau damping in metals imposes a trade-off between optical field confinement and losses. We show that a graphene-insulator-metal heterostructure can overcome that trade-off, and demonstrate plasmon confinement down to the ultimate limit of the length scale of one atom. This is achieved through far-field excitation of plasmon modes squeezed into an atomically thin hexagonal boron nitride dielectric spacer between graphene and metal rods. A theoretical model that takes into account the nonlocal optical response of both graphene and metal is used to describe the results. These ultraconfined plasmonic modes, addressed with far-field light excitation, enable a route to new regimes of ultrastrong light-matter interactions.
    Keywords: Physics
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Geosciences , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 3
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    Molecular/Organic ferromagnets (1988)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1988-04-01
    Description: Quantitative bulk ferromagnetic behavior has been established for the molecular/organic solid [Fe(III)(C(5)Me(5))(2)].(+)[TCNE].(-). Above 16 K the dominant magnetic interactions are along a 1-D chain and, near T(c), 3-D bulk effects as evidenced by the value of the critical exponents dominate the susceptibility. The extended McConnell model was developed and provides the synthetic chemist with guidance for making new molecular materials to study cooperative magnetic coupling in systems. Assuming the electron-transfer excitation arises from the POMO, ferromagnetic coupling by the McConnell mechanism requires stable radicals (neutral, cations/anions, or ions with small diamagnetic counterions) with a non-half-filled POMO. The lowest excited state formed via virtual charge transfer (retro or forward) must also have the same spin multiplicity and mix with the ground state. These requirements limit the structure of a radical to D(2d) or C〉/=(3) symmetry where symmetry breaking distortions do not occur. Intrinsic doubly and triply degenerate orbitals are not necessary and accidental degeneracies suffice. To achieve bulk ferromagnetism, ferromagnetic coupling must be established throughout the solid and a microscopic model has been discussed. These requirements are met by [Fe(III)(C(5)Me(5))(2)].(+)[TCNE].(-). Additionally this model suggests that the Ni(III) and Cr(III) analogs should be antiferromagnetic and ferrimagnetic, respectively, as preliminary data suggest. Additional studies are necessary to test and further develop the consequences of these concepts. Some molecular/organic solids comprised of linear chains of alternating metallocenium donors (D) and cyanocarbon acceptors (A) with spin state S = 1/2 (...D.(+)A.(-)D.(+)A.(-)...) exhibit cooperative magnetic phenomena, that is, ferro-, antiferro-, ferri-, and metamagnetism. For [Fe(III)(C(5)Me(5))(2)].(+)[TCNE](-). (Me = methyl; TCNE = tetracyanoethylene), bulk ferromagnetic behavior is observed below the Curie temperature of 4.8 K. A model of configuration mixing of the lowest charge-transfer excited state with the ground state was developed to understand the magnetic coupling as a function of electron configuration and direction of charge transfer. This model predicts that ferromagnetic coupling requires stable radicals with a non-half-filled degenerate valence orbital and a charge-transfer excited state with the same spin multiplicity that mixes with the ground state. Ferromagnetic coupling must dominate in all directions to achieve a bulk ferromagnet. Thus, the primary, secondary, and tertiary structures are crucial considerations for the design of molecular/organic ferromagnets.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Miller, J S -- Epstein, A J -- Reiff, W M -- New York, N.Y. -- Science. 1988 Apr 1;240(4848):40-7.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17748820" 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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  • 4
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    HEART DEVELOPMENT. Integration of Bmp and Wnt signaling by Hopx specifies commitment of cardiomyoblasts (2015)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2015-06-27
    Description: Cardiac progenitor cells are multipotent and give rise to cardiac endothelium, smooth muscle, and cardiomyocytes. Here, we define and characterize the cardiomyoblast intermediate that is committed to the cardiomyocyte fate, and we characterize the niche signals that regulate commitment. Cardiomyoblasts express Hopx, which functions to coordinate local Bmp signals to inhibit the Wnt pathway, thus promoting cardiomyogenesis. Hopx integrates Bmp and Wnt signaling by physically interacting with activated Smads and repressing Wnt genes. The identification of the committed cardiomyoblast that retains proliferative potential will inform cardiac regenerative therapeutics. In addition, Bmp signals characterize adult stem cell niches in other tissues where Hopx-mediated inhibition of Wnt is likely to contribute to stem cell quiescence and to explain the role of Hopx as a tumor suppressor.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Jain, Rajan -- Li, Deqiang -- Gupta, Mudit -- Manderfield, Lauren J -- Ifkovits, Jamie L -- Wang, Qiaohong -- Liu, Feiyan -- Liu, Ying -- Poleshko, Andrey -- Padmanabhan, Arun -- Raum, Jeffrey C -- Li, Li -- Morrisey, Edward E -- Lu, Min Min -- Won, Kyoung-Jae -- Epstein, Jonathan A -- 5-T32-GM-007170/GM/NIGMS NIH HHS/ -- K08 HL119553/HL/NHLBI NIH HHS/ -- K08 HL119553-02/HL/NHLBI NIH HHS/ -- R01 HL071546/HL/NHLBI NIH HHS/ -- U01 HL100405/HL/NHLBI NIH HHS/ -- New York, N.Y. -- Science. 2015 Jun 26;348(6242):aaa6071. doi: 10.1126/science.aaa6071.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Cell and Developmental Biology, Penn Cardiovascular Institute, Institute of Regenerative Medicine, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, PA 19104, USA. ; Department of Genetics, Institute for Diabetes, Obesity, and Metabolism, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, PA 19104, USA. ; Department of Cell and Developmental Biology, Penn Cardiovascular Institute, Institute of Regenerative Medicine, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, PA 19104, USA. epsteinj@upenn.edu.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/26113728" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Animals ; Bone Morphogenetic Proteins/genetics/*metabolism ; Cell Lineage/genetics ; Gene Expression ; *Gene Expression Regulation, Developmental ; Heart/*embryology ; Homeodomain Proteins/genetics/*metabolism ; Mice ; Mice, Mutant Strains ; Molecular Sequence Data ; Muscle, Smooth/cytology/metabolism ; Myoblasts, Cardiac/cytology/*metabolism ; Organogenesis/*genetics ; Stem Cell Niche/genetics/physiology ; Tumor Suppressor Proteins/genetics/*metabolism ; Wnt Signaling Pathway/*genetics
    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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  • 5
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    Response: Acid deposition in the Western United States (1986)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1986-07-04
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Oppenheimer, M -- Epstein, C B -- Yuhnke, R E -- New York, N.Y. -- Science. 1986 Jul 4;233(4759):12-4.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17812878" 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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  • 6
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    Arms control in space: space and national security (1987)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1987-12-11
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Epstein, G L -- New York, N.Y. -- Science. 1987 Dec 11;238(4833):1589-90.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17784297" 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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  • 7
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    Carcinogenic risk estimation (1988)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1988-05-20
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Epstein, S S -- Swartz, J B -- New York, N.Y. -- Science. 1988 May 20;240(4855):1043-7.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉University of Illinois Medical Center, Chicago 60680.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/3368788" target="_blank"〉PubMed〈/a〉
    Keywords: Air Pollution ; Animals ; *Carcinogens ; Humans ; Mutagenicity Tests ; Neoplasms/etiology/mortality ; Risk Factors
    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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    HTLV-III infection in brains of children and adults with AIDS encephalopathy (1985)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1985-01-11
    Description: Unexplained debilitating dementia or encephalopathy occurs frequently in adults and children with the acquired immune deficiency syndrome (AIDS). Brains from 15 individuals with AIDS and encephalopathy were examined by Southern analysis and in situ hybridization for the presence of human T-cell leukemia (lymphotropic) virus type III (HTLV-III), the virus believed to be the causative agent of AIDS. HTLV-III DNA was detected in the brains of five patients, and viral-specific RNA was detected in four of these. In view of these findings and the recent demonstration of morphologic and genetic relatedness between HTLV-III and visna virus, a lentivirus that causes a chronic degenerative neurologic disease in sheep, HTLV-III should be evaluated further as a possible cause of AIDS encephalopathy.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Shaw, G M -- Harper, M E -- Hahn, B H -- Epstein, L G -- Gajdusek, D C -- Price, R W -- Navia, B A -- Petito, C K -- O'Hara, C J -- Groopman, J E -- New York, N.Y. -- Science. 1985 Jan 11;227(4683):177-82.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2981429" target="_blank"〉PubMed〈/a〉
    Keywords: Acquired Immunodeficiency Syndrome/microbiology ; Adult ; Antibodies, Viral/analysis ; Brain Diseases/*microbiology ; Cerebral Cortex/analysis/*microbiology ; Child ; Deltaretrovirus/*isolation & purification ; Dementia/microbiology ; Female ; Humans ; Infant ; Male ; Middle Aged ; Nucleic Acid Hybridization ; RNA, Viral/analysis
    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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    Individual tumors of multifocal EB virus-induced malignant lymphomas in tamarins arise from different B-cell clones (1985)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1985-05-10
    Description: Cotton-top tamarins were inoculated with sufficient Epstein-Barr virus to induce multiple tumors in each animal within 14 to 21 days. The tumors consisted of large-cell lymphomas that contained multiple copies of the Epstein-Barr virus genome and generated Epstein-Barr virus-carrying cell lines showing no detectable consistent chromosomal abnormality. Hybridization of tumor DNA with immunoglobulin gene probes revealed that each lymphoma was oligo- or monoclonal in origin and that individual tumors from the same animal arose from different B-cell clones. Thus the virus induced multiple transformation events in tamarins in vivo to cause malignant tumors resembling the Epstein-Barr virus-associated lymphomas of patients with organ transplants.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Cleary, M L -- Epstein, M A -- Finerty, S -- Dorfman, R F -- Bornkamm, G W -- Kirkwood, J K -- Morgan, A J -- Sklar, J -- CA 34233/CA/NCI NIH HHS/ -- New York, N.Y. -- Science. 1985 May 10;228(4700):722-4.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2986287" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; B-Lymphocytes/*microbiology ; Burkitt Lymphoma/genetics/*microbiology ; Cell Line ; DNA, Neoplasm/genetics ; Heart Transplantation ; Herpesvirus 4, Human ; Humans ; Neoplasms, Experimental/genetics/microbiology ; Nucleic Acid Hybridization ; Saguinus
    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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  • 10
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    Acid deposition, smelter emissions, and the linearity issue in the Western United States (1985)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1985-08-30
    Description: The variation in sulfur dioxide emissions from nonferrous metal smelters in the western United States over a 4-year period is compared with the variation in sulfate concentrations in precipitation in the Rocky Mountain states. The data support a linear relation between emissions and sulfate concentration. The geographic separation of emissions sources and precipitation monitors indicates a sulfur transport scale exceeding 1000 kilometers.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Oppenheimer, M -- Epstein, C B -- Yuhnke, R E -- New York, N.Y. -- Science. 1985 Aug 30;229(4716):859-62.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17777926" 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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