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Disponibilidad
Institución detectada Período Navegá Descargá Solicitá
No detectada desde mar. 1997 / hasta dic. 2023 Science Journals

Información

Tipo de recurso:

revistas

ISSN impreso

0036-8075

ISSN electrónico

1095-9203

Editor responsable

American Association for the Advancement of Science (AAAS)

País de edición

Estados Unidos

Fecha de publicación

Cobertura temática

naturales

Ciencias naturales

Tabla de contenidos

doi: 10.1126/science.1213999

Isotopic Evidence for Massive Oxidation of Organic Matter Following the Great Oxidation Event

Lee R. Kump; Christopher Junium; Michael A. Arthur; Alex Brasier; Anthony Fallick; Victor Melezhik; Aivo Lepland; Alenka E. CČrne; Genming Luo

<jats:p>Analysis of two-billion-year-old rocks reveals an extreme carbon-cycle disruption after atmospheric oxygen increased.</jats:p>

Palabras clave: Multidisciplinary.

Pp. 1694-1696

doi: 10.1126/science.1209537

Fossilized Nuclei and Germination Structures Identify Ediacaran “Animal Embryos” as Encysting Protists

Therese Huldtgren; John A. Cunningham; Chongyu Yin; Marco Stampanoni; Federica Marone; Philip C. J. Donoghue; Stefan Bengtson

<jats:p>High-resolution imaging of 570-million-year-old fossils suggests that they were not remnants of early animals.</jats:p>

Palabras clave: Multidisciplinary.

Pp. 1696-1699

doi: 10.1126/science.1211437

From Flat Foot to Fat Foot: Structure, Ontogeny, Function, and Evolution of Elephant “Sixth Toes”

John R. Hutchinson; Cyrille Delmer; Charlotte E. Miller; Thomas Hildebrandt; Andrew A. Pitsillides; Alan Boyde

<jats:p>Elephants have an extra bone in their feet that can be traced through their fossil record to reveal a transition from flat to raised feet.</jats:p>

Palabras clave: Multidisciplinary.

Pp. 1699-1703

doi: 10.1126/science.1212928

Global Seabird Response to Forage Fish Depletion—One-Third for the Birds

Philippe M. Cury; Ian L. Boyd; Sylvain Bonhommeau; Tycho Anker-Nilssen; Robert J. M. Crawford; Robert W. Furness; James A. Mills; Eugene J. Murphy; Henrik Österblom; Michelle Paleczny; John F. Piatt; Jean-Paul Roux; Lynne Shannon; William J. Sydeman

<jats:p>One-third of maximum fish biomass must be available for seabirds to sustain high breeding success.</jats:p>

Palabras clave: Multidisciplinary.

Pp. 1703-1706

doi: 10.1126/science.1211222

Mouse B-Type Lamins Are Required for Proper Organogenesis But Not by Embryonic Stem Cells

Youngjo Kim; Alexei A. Sharov; Katie McDole; Melody Cheng; Haiping Hao; Chen-Ming Fan; Nicholas Gaiano; Minoru S. H. Ko; Yixian Zheng

<jats:p>Mice lacking critical structural components of the nucleus, lamin-B intermediate filament proteins, remain viable until birth.</jats:p>

Palabras clave: Multidisciplinary.

Pp. 1706-1710

doi: 10.1126/science.1211956

Direct Redox Regulation of F-Actin Assembly and Disassembly by Mical

Ruei-Jiun Hung; Chi W. Pak; Jonathan R. Terman

<jats:p>A protein involved in redox signaling disassembles actin filaments and alters their reassembly.</jats:p>

Palabras clave: Multidisciplinary.

Pp. 1710-1713

doi: 10.1126/science.1210770

Mismatch Repair, But Not Heteroduplex Rejection, Is Temporally Coupled to DNA Replication

Hans Hombauer; Anjana Srivatsan; Christopher D. Putnam; Richard D. Kolodner

<jats:p>Repair of base-pair mismatches is coordinated with DNA replication to ensure correction of the newly synthesized DNA strand.</jats:p>

Palabras clave: Multidisciplinary.

Pp. 1713-1716

doi: 10.1126/science.1212209

Model-Driven Engineering of RNA Devices to Quantitatively Program Gene Expression

James M. Carothers; Jonathan A. Goler; Darmawi Juminaga; Jay D. Keasling

<jats:p>Evidence is presented for the feasibility of computer-aided design of biological circuits for regulation of gene expression.</jats:p>

Palabras clave: Multidisciplinary.

Pp. 1716-1719

doi: 10.1126/science.1212596

A Cultured Greigite-Producing Magnetotactic Bacterium in a Novel Group of Sulfate-Reducing Bacteria

Christopher T. Lefèvre; Nicolas Menguy; Fernanda Abreu; Ulysses Lins; Mihály Pósfai; Tanya Prozorov; David Pignol; Richard B. Frankel; Dennis A. Bazylinski

<jats:p>The crystal structure of biomineralized magnetic nanocrystals depends on environmental and genetic factors.</jats:p>

Palabras clave: Multidisciplinary.

Pp. 1720-1723

doi: 10.1126/science.1209740

The Ribosome Modulates Nascent Protein Folding

Christian M. Kaiser; Daniel H. Goldman; John D. Chodera; Ignacio Tinoco; Carlos Bustamante

<jats:p>Single-molecule studies show that the ribosome promotes efficient folding of a two-domain protein.</jats:p>

Palabras clave: Multidisciplinary.

Pp. 1723-1727