Galaxy mass deduced from the structure of Einstein ring MG1654+1346.

abstract：:In the response of T cells to foreign antigens, the ligand for the T cell alpha/beta receptor is presented on a cell surface as a fragment of antigen complexed to one of the membrane molecules encoded in the major histocompatibility complex (MHC). The receptor apparently interacts via its variable elements (V beta, D ...

journal_title：Nature

authors： Marrack P,Kappler J

更新日期：1988-04-28 00:00:00

abstract：:Regulatory aspects of the Warnock Committee's report on reproductive technologies are summarized. A licensing authority with "substantial lay representation" would license practitioners and approve experimentation. Artificial insemination by donor would become a regulated service, and resulting children would be leg...

journal_title：Nature

authors：

更新日期：1984-07-26 00:00:00

abstract：:Naturally occurring peptides with biological actions have in most cases been detected by observing their biological activities in crude extracts and their isolation has been followed using bioassays. As a complement to the classical biological detection systems, we have proposed a chemical detection system based on fr...

journal_title：Nature

authors： Tatemoto K,Mutt V

更新日期：1980-06-05 00:00:00

abstract：:To ensure cell survival, it is essential that the ubiquitous pro-apoptotic machinery is kept quiescent. As death is irreversible, cells must continually integrate developmental information with regulatory inputs to control the switch between repressing and activating apoptosis. Inappropriate activation or suppression ...

journal_title：Nature

authors： Bloss TA,Witze ES,Rothman JH

更新日期：2003-08-28 00:00:00

abstract：:The arrest of dorsal root axonal regeneration at the transitional zone between the peripheral and central nervous system has been repeatedly described since the early twentieth century. Here we show that, with trophic support to damaged sensory axons, this regenerative barrier is surmountable. In adult rats with injur...

journal_title：Nature

authors： Ramer MS,Priestley JV,McMahon SB

更新日期：2000-01-20 00:00:00

abstract：:Inositol-1,4,5-trisphosphate receptors (InsP(3)Rs) and ryanodine receptors (RyRs) are tetrameric intracellular Ca(2+) channels. In each of these receptor families, the pore, which is formed by carboxy-terminal transmembrane domains, is regulated by signals that are detected by large cytosolic structures. InsP(3)R gati...

journal_title：Nature

authors： Seo MD,Velamakanni S,Ishiyama N,Stathopulos PB,Rossi AM,Khan SA,Dale P,Li C,Ames JB,Ikura M,Taylor CW

更新日期：2012-01-29 00:00:00

abstract：:A significant portion of prebiotic organic matter on the early Earth may have been introduced by carbonaceous asteroids and comets. The distribution and stable-isotope composition of individual organic compounds in carbonaceous meteorites, which are thought to be derived from asteroidal parent bodies, may therefore pr...

journal_title：Nature

authors： Engel MH,Macko SA,Silfer JA

更新日期：1990-11-01 00:00:00

abstract：:During anaphase identical sister chromatids separate and move towards opposite poles of the mitotic spindle. In the spindle, kinetochore microtubules have their plus ends embedded in the kinetochore and their minus ends at the spindle pole. Two models have been proposed to account for the movement of chromatids during...

journal_title：Nature

authors： Rogers GC,Rogers SL,Schwimmer TA,Ems-McClung SC,Walczak CE,Vale RD,Scholey JM,Sharp DJ

更新日期：2004-01-22 00:00:00

abstract：:In response to adenosine 5'-diphosphate, the P2Y1 receptor (P2Y1R) facilitates platelet aggregation, and thus serves as an important antithrombotic drug target. Here we report the crystal structures of the human P2Y1R in complex with a nucleotide antagonist MRS2500 at 2.7 Å resolution, and with a non-nucleotide antago...

journal_title：Nature

authors： Zhang D,Gao ZG,Zhang K,Kiselev E,Crane S,Wang J,Paoletta S,Yi C,Ma L,Zhang W,Han GW,Liu H,Cherezov V,Katritch V,Jiang H,Stevens RC,Jacobson KA,Zhao Q,Wu B

更新日期：2015-04-16 00:00:00

abstract：:The resemblance of the orbitally filtered isotope signal from the past 340 kyr in Antarctic ice cores to Northern Hemisphere summer insolation intensity has been used to suggest that the northern hemisphere may drive orbital-scale global climate changes. A recent Letter by Laepple et al. suggests that, contrary to thi...

journal_title：Nature

authors： Sime LC,Wolff EW

更新日期：2011-11-09 00:00:00

abstract：:Oxygen consumption by carnivorous reptiles increases enormously after they have eaten a large meal in order to meet metabolic demands, and this places an extra load on the cardiovascular system. Here we show that there is an extraordinarily rapid 40% increase in ventricular muscle mass in Burmese pythons (Python molur...

journal_title：Nature

authors： Andersen JB,Rourke BC,Caiozzo VJ,Bennett AF,Hicks JW

更新日期：2005-03-03 00:00:00

abstract：:Efforts to ablate soft tissue with conventional lasers have been limited by collateral damage and by concern over potential photochemical effects. Motivated by the thermal-confinement model, past infrared investigations targeted the OH-stretch mode of water with fast pulses from lasers emitting near 3,000 nm (refs 1, ...

journal_title：Nature

authors： Edwards G,Logan R,Copeland M,Reinisch L,Davidson J,Johnson B,Maciunas R,Mendenhall M,Ossoff R,Tribble J

更新日期：1994-09-29 00:00:00

abstract：:Gravitational lensing is a powerful tool for the study of the distribution of dark matter in the Universe. The cold-dark-matter model of the formation of large-scale structures (that is, clusters of galaxies and even larger assemblies) predicts the existence of quasars gravitationally lensed by concentrations of dark ...

journal_title：Nature

authors： Inada N,Oguri M,Pindor B,Hennawi JF,Chiu K,Zheng W,Ichikawa S,Gregg MD,Becker RH,Suto Y,Strauss MA,Turner EL,Keeton CR,Annis J,Castander FJ,Eisenstein DJ,Frieman JA,Fukugita M,Gunn JE,Johnston DE,Kent SM,Nichol

更新日期：2003-12-18 00:00:00

abstract：:The erosion of mountain belts controls their topographic and structural evolution and is the main source of sediment delivered to the oceans. Mountain erosion rates have been estimated from current relief and precipitation, but a more complete evaluation of the controls on erosion rates requires detailed measurements ...

journal_title：Nature

authors： Dadson SJ,Hovius N,Chen H,Dade WB,Hsieh ML,Willett SD,Hu JC,Horng MJ,Chen MC,Stark CP,Lague D,Lin JC

更新日期：2003-12-11 00:00:00

abstract：:Menopause is associated with bone loss and enhanced visceral adiposity. A polyclonal antibody that targets the β-subunit of the pituitary hormone follicle-stimulating hormone (Fsh) increases bone mass in mice. Here, we report that this antibody sharply reduces adipose tissue in wild-type mice, phenocopying genetic hap...

journal_title：Nature

authors： Liu P,Ji Y,Yuen T,Rendina-Ruedy E,DeMambro VE,Dhawan S,Abu-Amer W,Izadmehr S,Zhou B,Shin AC,Latif R,Thangeswaran P,Gupta A,Li J,Shnayder V,Robinson ST,Yu YE,Zhang X,Yang F,Lu P,Zhou Y,Zhu LL,Oberlin DJ,Davie

更新日期：2017-06-01 00:00:00

abstract：:The most severe excursions in the Earth's climatic history are thought to be associated with Proterozoic glaciations. According to the 'Snowball Earth' hypothesis, the Marinoan glaciation, which ended about 635 million years ago, involved global or nearly global ice cover. At the termination of this glacial period, ra...

journal_title：Nature

authors： Allen PA,Hoffman PF

更新日期：2005-01-13 00:00:00

abstract：:The role of magnetic domains (and the walls between domains) in determining the electrical properties of ferromagnetic materials has been investigated in great detail for many years, not least because control over domains offers a means of manipulating electron spin to control charge transport in 'spintronic' devices....

journal_title：Nature

authors： Kummamuru RK,Soh YA

更新日期：2008-04-17 00:00:00

abstract：:The establishment of embryonic polarity is a crucial step in pattern formation and morphogenesis. In the fruitfly Drosophila melanogaster, embryonic polarity depends primarily on genes expressed in the female during oogenesis. Mutations in these 'maternal effect' genes can lead to major disruptions in normal pattern f...

journal_title：Nature

authors： Steward R,McNally FJ,Schedl P

更新日期：1984-09-20 00:00:00

abstract：:The genes torso (tor) and torso-like (tsl) are two of the Drosophila maternal group genes implicated in a receptor tyrosine kinase signalling pathway that specifies terminal cell fate (reviewed in ref. 3). Loss-of-function mutations in these loci cause an identical phenotype in which pattern elements from the anterior...

journal_title：Nature

authors： Martin JR,Raibaud A,Ollo R

更新日期：1994-02-24 00:00:00

abstract：:The high-resolution seismic imaging of subducted oceanic slabs has become a powerful tool for reconstructing palaeogeography. The images can now be interpreted quantitatively by comparison with models of the general circulation of the Earth's mantle. Here we use a three-dimensional spherical computer model of mantle c...

journal_title：Nature

authors： Bunge HP,Grand SP

更新日期：2000-05-18 00:00:00

abstract：:Chromatin reorganization is governed by multiple post-translational modifications of chromosomal proteins and DNA. These histone modifications are reversible, dynamic events that can regulate DNA-driven cellular processes. However, the molecular mechanisms that coordinate histone modification patterns remain largely u...

journal_title：Nature

authors： Fujiki R,Hashiba W,Sekine H,Yokoyama A,Chikanishi T,Ito S,Imai Y,Kim J,He HH,Igarashi K,Kanno J,Ohtake F,Kitagawa H,Roeder RG,Brown M,Kato S

更新日期：2011-11-27 00:00:00

abstract：:Class-V myosin proceeds along actin filaments with large ( approximately 36 nm) steps. Myosin-V has two heads, each of which consists of a motor domain and a long (23 nm) neck domain. In accordance with the widely accepted lever-arm model, it was suggested that myosin-V steps to successive (36 nm) target zones along t...

journal_title：Nature

authors： Tanaka H,Homma K,Iwane AH,Katayama E,Ikebe R,Saito J,Yanagida T,Ikebe M

更新日期：2002-01-10 00:00:00

abstract：:Elucidation of the nature of the gene interactions that underly the sterility of interspecific hybrids is important in evolutionary biology. The interactions between the heterospecific X and Y (or Z and W) chromosomes are often used as an explanation for two reasons. First, the fertility of the hybrids of the heteroga...

journal_title：Nature

authors： Johnson NA,Perez DE,Cabot EL,Hollocher H,Wu CI

更新日期：1992-08-27 00:00:00

abstract：:The mitotic recombination behaviour of a duplication of the his4 region on chromosome III in the yeast Saccharomyces cerevisiae was studied. The major recombination event between the duplicated segments is gene conversion unassociated with reciprocal recombination. The rad52-1 mutation preferentially decreases mitotic...

journal_title：Nature

authors： Jackson JA,Fink GR

更新日期：1981-07-23 00:00:00

abstract：:Inhibition of the TOR signalling pathway by genetic or pharmacological intervention extends lifespan in invertebrates, including yeast, nematodes and fruitflies; however, whether inhibition of mTOR signalling can extend lifespan in a mammalian species was unknown. Here we report that rapamycin, an inhibitor of the mTO...

journal_title：Nature

authors： Harrison DE,Strong R,Sharp ZD,Nelson JF,Astle CM,Flurkey K,Nadon NL,Wilkinson JE,Frenkel K,Carter CS,Pahor M,Javors MA,Fernandez E,Miller RA

更新日期：2009-07-16 00:00:00

abstract：:In general, heterozygous animal cells express both alleles at a particular locus. The only exceptions are cells of XX genotype after inactivation of one X chromosome, and immunoglobulin-producing cells; in each case only one of the two alleles is expressed in differentiated cells and their progeny. This phenomenon, te...

journal_title：Nature

authors： Joho R,Weissman IL

更新日期：1980-03-13 00:00:00

abstract：:Measuring the completeness of the fossil record is essential to understanding evolution over long timescales, particularly when comparing evolutionary patterns among biological groups with different preservational properties. Completeness measures have been presented for various groups based on gaps in the stratigraph...

journal_title：Nature

authors： Foote M,Sepkoski JJ Jr

更新日期：1999-04-01 00:00:00

abstract：:How left/right functional asymmetry is layered on top of an anatomically symmetrical nervous system is poorly understood. In the nematode Caenorhabditis elegans, two morphologically bilateral taste receptor neurons, ASE left (ASEL) and ASE right (ASER), display a left/right asymmetrical expression pattern of putative ...

journal_title：Nature

authors： Johnston RJ,Hobert O

更新日期：2003-12-18 00:00:00

abstract：:Seafloor spreading is largely unobserved because 98 per cent of the global mid-ocean-ridge system is below the ocean surface. Our understanding of the dynamic processes that control seafloor spreading is thus inferred largely from geophysical observations of spreading events on land at Afar in East Africa and Iceland....

journal_title：Nature

authors： Tan YJ,Tolstoy M,Waldhauser F,Wilcock WS

更新日期：2016-12-08 00:00:00

abstract：:The crystal structure of a solid controls the interactions between the electronically active units and thus its electronic properties. In the high-temperature superconducting copper oxides, only one spatial arrangement of the electronically active Cu(2+) units-a two-dimensional square lattice-is available to study the...

journal_title：Nature

authors： Ganin AY,Takabayashi Y,Jeglic P,Arcon D,Potocnik A,Baker PJ,Ohishi Y,McDonald MT,Tzirakis MD,McLennan A,Darling GR,Takata M,Rosseinsky MJ,Prassides K

更新日期：2010-07-08 00:00:00