A disintegrating minor planet transiting a white dwarf.

abstract：:ELLIPTICAL galaxies acting as gravitational lenses occasionally produce spectacular images-Einstein rings-of distant objects. Giant arcs(1) and radio rings(2) have been observed. A wide variety of image morphologies is possible, the generation of which is qualitatively understood in terms of large magnifications at ca...

journal_title：Nature

authors： Langston GI,Conner SR,Lehar J,Burke BF,Weiler KW

更新日期：1990-03-01 00:00:00

abstract：:Effective interaction between T cells and their targets requires that recognition of specific antigen be coordinated with increased cell-cell adhesion. We show that antigen-receptor cross-linking increases the strength of the adhesion mechanism between lymphocyte function-associated molecule-1 (LFA-1) and intercellula...

journal_title：Nature

authors： Dustin ML,Springer TA

更新日期：1989-10-19 00:00:00

abstract：:In standard fluid dynamics, the density change associated with flow is often assumed to be negligible, implying that the fluid is incompressible. For example, this has been established for simple shear flows, where no pressure change is associated with flow: there is no volume deformation due to viscous stress and ine...

journal_title：Nature

authors： Furukawa A,Tanaka H

更新日期：2006-09-28 00:00:00

abstract：:Since the discovery of the first exoplanets, it has been known that other planetary systems can look quite unlike our own. Until fairly recently, we have been able to probe only the upper range of the planet size distribution, and, since last year, to detect planets that are the size of Earth or somewhat smaller. Hith...

journal_title：Nature

authors： Barclay T,Rowe JF,Lissauer JJ,Huber D,Fressin F,Howell SB,Bryson ST,Chaplin WJ,Désert JM,Lopez ED,Marcy GW,Mullally F,Ragozzine D,Torres G,Adams ER,Agol E,Barrado D,Basu S,Bedding TR,Buchhave LA,Charbonneau D,Ch

更新日期：2013-02-28 00:00:00

abstract：:Transcription factors recognize specific genomic sequences to regulate complex gene-expression programs. Although it is well-established that transcription factors bind to specific DNA sequences using a combination of base readout and shape recognition, some fundamental aspects of protein-DNA binding remain poorly und...

journal_title：Nature

authors： Afek A,Shi H,Rangadurai A,Sahay H,Senitzki A,Xhani S,Fang M,Salinas R,Mielko Z,Pufall MA,Poon GMK,Haran TE,Schumacher MA,Al-Hashimi HM,Gordân R

更新日期：2020-11-01 00:00:00

abstract：:Adsorption-based phenomena are important in gas separations, such as the treatment of greenhouse-gas and toxic-gas pollutants, and in water-adsorption-based heat pumps for solar cooling systems. The ability to tune the pore size, shape and functionality of crystalline porous coordination polymers--or metal-organic fra...

journal_title：Nature

authors： Krause S,Bon V,Senkovska I,Stoeck U,Wallacher D,Többens DM,Zander S,Pillai RS,Maurin G,Coudert FX,Kaskel S

更新日期：2016-04-21 00:00:00

abstract：:Vertebrate and invertebrate digestive systems show extensive similarities in their development, cellular makeup and genetic control. The Drosophila midgut is typical: enterocytes make up the majority of the intestinal epithelial monolayer, but are interspersed with hormone-producing enteroendocrine cells. Human (and m...

journal_title：Nature

authors： Ohlstein B,Spradling A

更新日期：2006-01-26 00:00:00

abstract：:Retrospective epidemiological data have indicated that cutaneous malignant melanoma may arise as a consequence of intense, intermittent exposure of the skin to ultraviolet radiation, particularly in children, rather than from the cumulative lifetime exposure that is associated with other forms of skin cancer. Here we ...

journal_title：Nature

authors： Noonan FP,Recio JA,Takayama H,Duray P,Anver MR,Rush WL,De Fabo EC,Merlino G

更新日期：2001-09-20 00:00:00

abstract：:When we reach towards an object that suddenly appears in our peripheral visual field, not only does our arm extend towards the object, but our eyes, head and body also move in such a way that the image of the object falls on the fovea. Popular models of how reaching movements are programmed have argued that while the ...

journal_title：Nature

authors： Goodale MA,Pelisson D,Prablanc C

更新日期：1986-04-24 00:00:00

abstract：:The ubiquity of tertiary alkylamines in pharmaceutical and agrochemical agents, natural products and small-molecule biological probes1,2 has stimulated efforts towards their streamlined synthesis3-9. Arguably the most robust method for the synthesis of tertiary alkylamines is carbonyl reductive amination3, which compr...

journal_title：Nature

authors： Kumar R,Flodén NJ,Whitehurst WG,Gaunt MJ

更新日期：2020-05-01 00:00:00

abstract：:Acetylcholine and dopamine are key neurotransmitters in the extrapyramidal motor system, where they are thought to lie in a 'functional balance' brought about by interactions between the terminals of the dopamine-containing nigrostriatal tract and the cholinergic interneurones of the striatum. The precise nature of th...

journal_title：Nature

authors： Graybiel AM,Baughman RW,Eckenstein F

更新日期：1986-10-16 00:00:00

abstract：:Although many animals use the Earth's magnetic field for orientation and navigation, the precise biophysical mechanisms underlying magnetic sensing have been elusive. One theoretical model proposes that geomagnetic fields are perceived by chemical reactions involving specialized photoreceptors. However, the specific p...

journal_title：Nature

authors： Gegear RJ,Casselman A,Waddell S,Reppert SM

更新日期：2008-08-21 00:00:00

abstract：:The extent of allelic variation has been estimated at 46 structural gene loci within three major colonies of Swiss mice and between inbred derivative strains. The colonies have retained nearly the same amount and type of variation found in natural murine or human populations despite laboratory propagation for more tha...

journal_title：Nature

authors： Rice MC,O'Brien SJ

更新日期：1980-01-10 00:00:00

abstract：:Human apolipoprotein E has three isoforms: APOE2, APOE3 and APOE4. APOE4 is a major genetic risk factor for Alzheimer's disease and is associated with Down's syndrome dementia and poor neurological outcome after traumatic brain injury and haemorrhage. Neurovascular dysfunction is present in normal APOE4 carriers and i...

journal_title：Nature

authors： Bell RD,Winkler EA,Singh I,Sagare AP,Deane R,Wu Z,Holtzman DM,Betsholtz C,Armulik A,Sallstrom J,Berk BC,Zlokovic BV

更新日期：2012-05-16 00:00:00

abstract：:Globular star clusters that formed at the same cosmic time may have evolved rather differently from the dynamical point of view (because that evolution depends on the internal environment) through a variety of processes that tend progressively to segregate stars more massive than the average towards the cluster centre...

journal_title：Nature

authors： Ferraro FR,Lanzoni B,Dalessandro E,Beccari G,Pasquato M,Miocchi P,Rood RT,Sigurdsson S,Sills A,Vesperini E,Mapelli M,Contreras R,Sanna N,Mucciarelli A

更新日期：2012-12-20 00:00:00

abstract：:The antigen receptors on mature B lymphocytes are membrane-bound immunoglobulins of the IgM and IgD classes whose cross-linking by polyvalent antigens results in B-cell proliferation and differentiation. How these membrane-bound immunoglobulin chains, which lack a cytoplasmic tail, generate a cell activation signal is...

journal_title：Nature

authors： Hombach J,Tsubata T,Leclercq L,Stappert H,Reth M

更新日期：1990-02-22 00:00:00

abstract：:DNA sequences containing the 5'-flanking regions of the insulin and chymotrypsin genes were linked to the coding sequence of the chloramphenicol acetyltransferase (CAT) gene. The insulin gene recombinant elicits preferential expression of CAT activity when introduced into cells producing insulin; similarly, the chymot...

journal_title：Nature

authors： Walker MD,Edlund T,Boulet AM,Rutter WJ

更新日期：1983-12-08 00:00:00

abstract：:The first event in the initiation of an immune response is the capture and presentation of antigen to T cells. Such presentation involves two distinct steps: (1) display of the antigen, which requires uptake, processing and re-expression of the antigen in association with MHC molecules on the presenting cell surface; ...

journal_title：Nature

authors： Lassila O,Vainio O,Matzinger P

更新日期：1988-07-21 00:00:00

abstract：:Chronic administration of several chemical carcinogens to laboratory animals induces a variety of tumours which arise from specific cell populations within the liver. In the rat, diethylnitrosamine induces hepatocellular carcinomas, dimethylnitrosamine induces both angiosarcomas and hepatocellular carcinomas, vinyl ch...

journal_title：Nature

authors： Lewis JG,Swenberg JA

更新日期：1980-11-13 00:00:00

abstract：:Mutational activation of BRAF is the most prevalent genetic alteration in human melanoma, with ≥50% of tumours expressing the BRAF(V600E) oncoprotein. Moreover, the marked tumour regression and improved survival of late-stage BRAF-mutated melanoma patients in response to treatment with vemurafenib demonstrates the ess...

journal_title：Nature

authors： Das Thakur M,Salangsang F,Landman AS,Sellers WR,Pryer NK,Levesque MP,Dummer R,McMahon M,Stuart DD

更新日期：2013-02-14 00:00:00

abstract：:Fusion of biological membranes is mediated by specific lipid-interacting proteins that induce the formation and expansion of an initial fusion pore. Here we report the crystal structure of the ectodomain of the Semliki Forest virus fusion glycoprotein E1 in its low-pH-induced trimeric form. E1 adopts a folded-back con...

journal_title：Nature

authors： Gibbons DL,Vaney MC,Roussel A,Vigouroux A,Reilly B,Lepault J,Kielian M,Rey FA

更新日期：2004-01-22 00:00:00

abstract：:Nanoscale electronic devices made from carbon nanotubes, such as transistors and sensors, are much smaller and more versatile than those that rely on conventional microelectronic chips, but their development for mass production has been thwarted by difficulties in aligning and integrating the millions of nanotubes req...

journal_title：Nature

authors： Rao SG,Huang L,Setyawan W,Hong S

更新日期：2003-09-04 00:00:00

abstract：:A fundamental challenge to our understanding of biodiversity is to explain why some groups of species undergo adaptive radiations, diversifying extensively into many and varied species, whereas others do not. Both extrinsic environmental factors (for example, resource availability, climate) and intrinsic lineage-speci...

journal_title：Nature

authors： Wagner CE,Harmon LJ,Seehausen O

更新日期：2012-07-19 00:00:00

abstract：:Ferroptosis-an iron-dependent, non-apoptotic cell death process-is involved in various degenerative diseases and represents a targetable susceptibility in certain cancers1. The ferroptosis-susceptible cell state can either pre-exist in cells that arise from certain lineages or be acquired during cell-state transitions...

journal_title：Nature

authors： Zou Y,Henry WS,Ricq EL,Graham ET,Phadnis VV,Maretich P,Paradkar S,Boehnke N,Deik AA,Reinhardt F,Eaton JK,Ferguson B,Wang W,Fairman J,Keys HR,Dančík V,Clish CB,Clemons PA,Hammond PT,Boyer LA,Weinberg RA,Schreiber

更新日期：2020-09-01 00:00:00

abstract：:Eukaryotic cells seem to use GTP hydrolysis to regulate vesicular traffic in exocytosis and endocytosis. The best evidence for this comes from studies on the yeast Saccharomyces cerevisiae that have identified two small Ras-related GTP-binding proteins, Sec4p and Ypt1p, which control distinct stages of the secretory p...

journal_title：Nature

authors： Goud B,Zahraoui A,Tavitian A,Saraste J

更新日期：1990-06-07 00:00:00

abstract：:The evolution of animal personalities is a topic of primary importance in behavioural ecology. An intriguing empirical fact is the consistency of animal responses to repeated stresses or threats. Wolf et al. propose an evolutionary model to explain the emergence of consistent personalities. They show that a population...

journal_title：Nature

authors： Massol F,Crochet PA

更新日期：2008-02-28 00:00:00

abstract：:Obesity is now so common within the world's population that it is beginning to replace undernutrition and infectious diseases as the most significant contributor to ill health. In particular, obesity is associated with diabetes mellitus, coronary heart disease, certain forms of cancer, and sleep-breathing disorders. O...

journal_title：Nature

authors： Kopelman PG

更新日期：2000-04-06 00:00:00

abstract：:The genetic architecture of autism spectrum disorder involves the interplay of common and rare variants and their impact on hundreds of genes. Using exome sequencing, here we show that analysis of rare coding variation in 3,871 autism cases and 9,937 ancestry-matched or parental controls implicates 22 autosomal genes ...

journal_title：Nature

authors： De Rubeis S,He X,Goldberg AP,Poultney CS,Samocha K,Cicek AE,Kou Y,Liu L,Fromer M,Walker S,Singh T,Klei L,Kosmicki J,Shih-Chen F,Aleksic B,Biscaldi M,Bolton PF,Brownfeld JM,Cai J,Campbell NG,Carracedo A,Chahrour

更新日期：2014-11-13 00:00:00

abstract：:Although phytoalexins have long been inferred to be important in the defence of plants against fungal infection, there are few reports showing that they provide resistance to infection. Several plants, including grapevine, synthesize the stilbene-type phytoalexin resveratrol when attacked by pathogens. Stilbenes with ...

journal_title：Nature

authors： Hain R,Reif HJ,Krause E,Langebartels R,Kindl H,Vornam B,Wiese W,Schmelzer E,Schreier PH,Stöcker RH

更新日期：1993-01-14 00:00:00

abstract：:Plant growth and development is regulated by a structurally unrelated collection of small molecules called plant hormones. During the last 15 years the number of known plant hormones has grown from five to at least ten. Furthermore, many of the proteins involved in plant hormone signalling pathways have been identifie...

journal_title：Nature

authors： Santner A,Estelle M

更新日期：2009-06-25 00:00:00