Results 101 to 110 of about 239,615 (282)

Dark Energy and Gravity

, 2007
I review the problem of dark energy focusing on the cosmological constant as the candidate and discuss its implications for the nature of gravity. Part 1 briefly overviews the currently popular `concordance cosmology' and summarises the evidence for dark
A. Albrecht, A. Ashtekar, A. Balbi, A. Das, A. Hebecker, A. Ishibashi, A. Mukhopadhyay, A. Paranjape, A. Paranjape, A.A. Andrianov, A.A. Starobinsky, A.A. Starobinsky, A.A. Starobinsky, A.D. Linde, A.D. Sakharov, A.G. Reiss, A.G. Reiss, A.H. Guth, A.H. Guth, A.J.S. Hamilton, A.V. Frolov, B. Losic, B.J. Barris, B.S. DeWitt, B.S. Mason, C. Espana-Bonet, C. Espana-Bonet, C. Lanczos, C. Lanczos, C.J. Kim, C.L. Bennett, C.M. Hirata, D. Choudhury, D. Kazanas, D. Lovelock, D. Munshi, D. Polarski, D. Rapetti, D. Sorkin, D.A. Steer, D.N. Spergel, E. Baum, E. Elizalde, E. Elizalde, E. Mottola, E.J. Copeland, F. Bauer, F. Wilczek, F.E. Schunck, G. Efstathiou, G. Efstathiou, G. Shiu, G.E. Volovik, G.E. Volovik, G.F. Smoot, G.F.R. Ellis, G.F.R. Ellis, G.W. Gibbons, G.W. Gibbons, G.W. Gibbons, H. Wei, H.K. Jassal, H.K. Jassal, H.S. Snyder, I.L. Shapiro, I.L. Shapiro, I.L. Shapiro, I.P. Neupane, J. Sola, J. Sola, J.B. Hartle, J.B. Hartle, J.J. Hallwell, J.J. van der Bij, J.L. Tonry, J.M. Bardeen, J.P. Ostriker, J.R. Mould, J.S. Alcaniz, J.S. Alcaniz, J.S. Bagla, J.S. Bagla, J.S. Bagla, J.S. Bagla, J.S. Bagla, J.S. Bagla, J.V. Narlikar, J.W. York, K. Srinivasan, K. Srinivasan, L. Bombelli, L. Frederic, L. Perivolaropoulos, L. Raul, L. Sriramkumar, L. Sriramkumar, L.F. Abbott, L.H. Ford, L.J. Garay, L.P. Chimento, L.P. Chimento, M. Fontanini, M. Malquarti, M. Sami, M. Sami, M. Sami, M. Srednicki, N. Kanekar, N.C. Tsamis, P. Astier, P. Bernardis de, P.F. Gonzalez-Diaz, P.J. Steinhardt, P.J.E. Peebles, R. Brustein, R. Nityananda, R. Rosenfeld, R.J. Scherrer, R.M. Wald, R.M. Zalaletdinov, S. Coleman, S. Engineer, S. Hanany, S. Hannestad, S. Jha, S. Nesseris, S. Sarkar, S. Sen, S.A. Fulling, S.J. Perlmutter, S.M. Barr, S.N. Gurbatov, S.W. Hawking, S.W. Hawking, T. Buchert, T. Buchert, T. Jacobson, T. Mongan, T. Mongan, T. Padmanabhan, T. Padmanabhan, T. Padmanabhan, T. Padmanabhan, T. Padmanabhan, T. Padmanabhan, T. Padmanabhan, T. Padmanabhan, T. Padmanabhan, T. Padmanabhan, T. Padmanabhan, T. Padmanabhan, T. Padmanabhan, T. Padmanabhan, T. Padmanabhan, T. Padmanabhan, T. Padmanabhan, T. Padmanabhan, T. Padmanabhan, T. Padmanabhan, T. Padmanabhan, T. Padmanabhan, T. Padmanabhan, T. Padmanabhan, T. Padmanabhan, T. Padmanabhan, T. Padmanabhan, T. Padmanabhan, T. Padmanabhan, T. Padmanabhan, T. Padmanabhan, T. Padmanabhan, T. Padmanabhan, T. Padmanabhan, T. Padmanabhan, T. Padmanabhan, T. Padmanabhan, T. Padmanabhan, T. Padmanabhan, T. Padmanabhan, T. Padmanabhan, T. Padmanabhan, T. Padmanabhan, T. Padmanabhan, T. Padmanabhan, T. Padmanabhan, T. Padmanabhan, T. Padmanabhan, T. Padmanabhan, T. Padmanabhan, T. Padmanabhan, T. Roy Choudhury, T. Yoneya, T.G. Brainerd, T.J. Pearson, T.P. Singh, T.P. Singh, V. Gorini, V. Iyer, V. Sahni, V.F. Cardone, V.G. Lapchinsky, W. Buchmuller, W. Freedman, W. Godlowski, W.G. Unruh, W.G. Unruh, W.J. Percival, W.J. Percival, X. Calmet, X. Wang, X.-Z. Li, Ya.B. Zeldovich   +211 more
core   +1 more source

Tumour–host interactions in Drosophila: mechanisms in the tumour micro‐ and macroenvironment

Molecular Oncology, EarlyView.
This review examines how tumour–host crosstalk takes place at multiple levels of biological organisation, from local cell competition and immune crosstalk to organism‐wide metabolic and physiological collapse. Here, we integrate findings from Drosophila melanogaster studies that reveal conserved mechanisms through which tumours hijack host systems to ...
José Teles‐Reis, Tor Erik Rusten
wiley   +1 more source

Bosonic field equations from an exact uncertainty principle

, 2003
A Hamiltonian formalism is used to describe ensembles of fields in terms of two canonically conjugate functionals (one being the field probability density).
Ashtekar A, Ballentine L E, Brown L S, Davidson M, Dirac P A M, Gerlach U H, Goldstein H, Hall M J W, Hall M J W, Hall M J W, Hall M J W, Hawking S W, Holland P R, Kailash Kumar, Kontoleon N, Marcel Reginatto, Michael J W Hall, Papenfuss D, Peres A, Plastino A R, Roman P, Rovelli C, Schweber S S, Tsamis N C, Vilenkin A, Wheeler J A   +25 more
core   +1 more source

Colorectal cancer‐derived FGF19 is a metabolically active serum biomarker that exerts enteroendocrine effects on mouse liver

Molecular Oncology, EarlyView.
Meta‐transcriptome analysis identified FGF19 as a peptide enteroendocrine hormone associated with colorectal cancer prognosis. In vivo xenograft models showed release of FGF19 into the blood at levels that correlated with tumor volumes. Tumoral‐FGF19 altered murine liver metabolism through FGFR4, thereby reducing bile acid synthesis and increasing ...
Jordan M. Beardsley, Michael W. Rohr, Joseph A. Goode, Sai Preethi Nakkina, Jignesh G. Parikh, Deborah A. Altomare   +5 more
wiley   +1 more source

Engineered extracellular vesicles enriched with the miR‐214/199a cluster enhance the efficacy of chemotherapy in ovarian cancer

Molecular Oncology, EarlyView.
Loss of the miR‐214/199a cluster is associated with recurrence in ovarian cancer. Engineered small extracellular vesicles (m214‐sEVs) elevate miR‐214‐3p/miR‐199a‐5p in tumor cells, suppress β‐catenin, TLR4, and YKT6 signaling, reprogram tumor‐derived sEV cargo, reduce chemoresistance and migration, and enhance carboplatin efficacy and survival in ...
Weida Wang, Ayesha Alvero, Yi Qin, Mingjin Wang, Alexandra Fox, Yanfeng Li, Michael Millman, Amy Kemper, Gil Mor, Xian Shuang Liu, Michael Chopp, Zheng Gang Zhang, Yi Zhang   +12 more
wiley   +1 more source

Where has all the information gone?

, 2005
The existence of spacetime singularities is irrelevant for the irreversible appearance of black holes. However, confirmation of the latter's unitary dynamics would require the preparation of a coherent superposition of a tremendous number of appropriate `
't Hooft, Ashtekhar, Borel, Conradi, Demers, Einstein, Einstein, Gottesmann, H.D. Zeh, Hawking, Horowitz, Hájíček, Joos, Joos, Kiefer, Kiefer, Kiefer, Kiefer, Page, Page, Penrose, Schloßhauer, Susskind, Zeh, Zeh, Zeh, Zeh, Zeh, Zeh, Zeh   +29 more
core   +1 more source

Naked cuticle is essential for Drosophila wing development beyond Wingless signaling

FEBS Open Bio, EarlyView.
Naked cuticle (Nkd), a Wnt signaling inhibitor, assumes extensive roles in Drosophila wing development. Overexpressing Nkd causes smaller, crumpled wings, while also perturbing multiple signaling pathways and developmental genes. A specific region (R1S) is critical for Nkd's function as a signaling integrator, offering new insights for studying its ...
Rui Wang, Ping Wang
wiley   +1 more source

Influence of Nitrogen Doping on Vacancy-Engineered T-Graphene Fragments: Insights into Electronic and Optical Properties

Chemistry
This study investigates the influence of vacancy engineering and nitrogen doping on the structural, electronic, and optical properties of T-graphene fragments (TFs) using density functional theory (DFT) and time-dependent DFT (TD-DFT).
Jyotirmoy Deb, Pratim Kumar Chattaraj
doaj   +1 more source

Energy lowering of current-carrying single-particle states in open-shell atoms due to an exchange-correlation vector potential

, 2004
Current-density-functional theory is used to perturbatively calculate single-particle energies of open-shell atoms prepared in a current-carrying state.
Becke, Becke, Capelle, Chen, Colwell, Dreizler, Gunnarsson, Kohn, Kohn, Lee, Lee, Lee, Orestes, Parr, Perdew, Perdew, Rasolt, Vignale, Vignale, Vignale, Vignale   +20 more
core   +1 more source

Regioselectivity of Radical Additions to Substituted Alkenes: Insight from Conceptual Density Functional Theory

The Journal of Organic Chemistry, 2010
Radical additions to substituted alkenes are among the most important reactions in radical chemistry. Nonetheless, there is still some controversy in the literature about the factors that affect the rate and regioselectivity in these addition reactions.
De Vleeschouwer, Freija, Jaque Olmedo, Pablo César, Geerlings, Paul, Toro Labbé, Alejandro, De Proft, Frank   +4 more
openaire   +6 more sources