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dspace.mit.edu 檢索結果共 84617 筆,本頁資料從第 133 筆到第 144 筆

Hard-spin mean-field theory has recently been applied to Ising magnets, correctly yielding the absence and presence of an interface roughening transition respectively in d = 2 and d = 3 dimensions and producing the ordering-roughening phase diagram for isotropic and anisotropic systems. The approach has now been extended to the effects of quenched random pinning centers....

By A. Nihat Berker,Tolga Caglar--American Physical Society--2016-01-07
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Strain in a material induces shifts in vibrational frequencies. This phenomenon is a probe of the nature of the vibrations and interatomic potentials and can be used to map local stress/strain distributions via Raman microscopy. This method is standard for crystalline silicon devices, but due to the lack of calibration relations, it has not been applied to amorphous mat....

By Eric C. Johlin,Timothy R. Kirkpatrick,Tonio Buonassisi,Jeffrey C. Grossman,David Strubbe--American Physical Society--2016-01-07
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We propose a search for dark photons A[superscript ′] at the LHCb experiment using the charm meson decay D[superscript *](2007)[superscript 0] → D[superscript 0]A[superscript ′]. At nominal luminosity, D[superscript *0] → D[superscript 0]γ decays will be produced at about 700 kHz within the LHCb acceptance, yielding over 5 trillion such decays during Run 3 of ....

By Jesse Thaler,Wei Xue,Philip James Ilten,Michael Williams--American Physical Society--2016-01-07
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Hopanes and steranes found in Archean rocks have been presented as key evidence supporting the early rise of oxygenic photosynthesis and eukaryotes, but the syngeneity of these hydrocarbon biomarkers is controversial. To resolve this debate, we performed a multilaboratory study of new cores from the Pilbara Craton, Australia, that were drilled and sampled using unpreced....

By Katherine L. French,Christian Hallmann,Janet M. Hope,Petra L. Schoon,J. Alex Zumberge,Y Hoshino--National Academy of Sciences (U.S.)--2016-01-07
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Bacterial strains carrying nonsense suppressor tRNA genes played a crucial role in early work on bacterial and bacterial viral genetics. In eukaryotes as well, suppressor tRNAs have played important roles in the genetic analysis of yeast and worms. Surprisingly, little is known about genetic suppression in archaea, and there has been no characterization of suppressor tR....

By Arpita Bhattacharya,Debabrata Mandal,Caroline Koehrer,Uttam L. Rajbhandary--National Academy of Sciences (U.S.)--2016-01-07
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At their margins, tumors often contain neutrophils, dendritic cells, and activated macrophages, which express class II MHC and CD11b products. The interplay between stromal cells, tumor cells, and migratory cells such as lymphocytes creates opportunities for noninvasive imaging of immune responses. We developed alpaca-derived antibody fragments specific for mouse class ....

By Mohammad Rashidian,Edmund J. Keliher,Angelina M. Bilate,Joao N. Duarte,Gregory R. Wojtkiewicz--National Academy of Sciences (U.S.)--2016-01-07
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In recent years, ideas from the computational field of reinforcement learning have revolutionized the study of learning in the brain, famously providing new, precise theories of how dopamine affects learning in the basal ganglia. However, reinforcement learning algorithms are notorious for not scaling well to multidimensional environments, as is required for real-world ....

By Yael Niv,Reka Daniel,Andra Geana,Samuel J. Gershman,Yuan Chang Leong,Angela Radulescu,Robert Wilson--Society for Neuroscience--2016-01-07
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During breast cancer progression, alternative mRNA splicing produces functionally distinct isoforms of Mena, an actin regulator with roles in cell migration and metastasis. Aggressive tumor cell subpopulations express Mena[superscript INV], which promotes tumor cell invasion by potentiating EGF responses. However, the mechanism by which this occurs is unknown. Here we r....

By Shannon Kay Hughes,Madeleine Julie Oudin,Jenny Tadros,Jason Neil,Amanda M. Del Rosario--American Society for Cell Biology--2016-01-07
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siRNA delivery targeting tumor cells and cancer-associated immune cells has been gaining momentum in the last few years. A combinatorial approach for silencing crucial factors essential for tumor progression in cancer-associated immune cells and in cancer cells simultaneously can effectively shift the tumor microenvironment from pro-oncogenic to anti-tumoral. Gene-thera....

By Christina E. Arnold,Furong Tian,Natalie Artzi,Joao Conde--Elsevier--2016-01-07
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Let an (r,s)-formation be a concatenation of s permutations of r distinct letters, and let a block of a sequence be a subsequence of consecutive distinct letters. A k-chain on [1,m] is a sequence of k consecutive, disjoint, nonempty intervals of the form [a[subscript 0],a[subscript 1]][a[subscript 1] + 1,a[subscript 2]]…[a[subscript k−1] + 1,a[subscript k]] for inte....

By Jesse Geneson--European Mathematical Information Service (EMIS)--2016-01-07
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Birational rowmotion — a birational map associated to any finite poset P — has been introduced by Einstein and Propp as a far-reaching generalization of the (well-studied) classical rowmotion map on the set of order ideals of P. Continuing our exploration of this birational rowmotion, we prove that it has order p + q on the (p,q)-rectangle poset (i.e., on the produc....

By Darij Grinberg,Tom Roby--European Mathematical Information Service (EMIS)--2016-01-07
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The single cell gel electrophoresis assay, also known as the comet assay, is a versatile method for measuring many classes of DNA damage, including base damage, abasic sites, single strand breaks and double strand breaks. However, limited throughput and difficulties with reproducibility have limited its utility, particularly for clinical and epidemiological studies. To ....

By B. P. Engelward,Jing Ge,Danielle N. Chow,Jessica L. Fessler,David M. Weingeist,David K Wood--Oxford University Press--2016-01-07
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