Insects breathe discontinuously to avoid oxygen toxicity.

abstract：:Neuronal function depends crucially on the spatial segregation of specific membrane proteins, particularly the segregation associated with sites of synaptic contact. Understanding the factors governing this localization of proteins is a major goal of cellular neurobiology. A conspicuous example of synaptic specializat...

journal_title：Nature

authors： Beam KG,Caldwell JH,Campbell DT

更新日期：1985-02-14 00:00:00

abstract：:A fundamental tenet of cerebellar learning theories asserts that climbing fibre afferents from the inferior olive provide a teaching signal that promotes the gradual adaptation of movements. Data from several forms of motor learning provide support for this tenet. In pavlovian eyelid conditioning, for example, where a...

journal_title：Nature

authors： Medina JF,Nores WL,Mauk MD

更新日期：2002-03-21 00:00:00

abstract：:Blazars are active galactic nuclei, which are powerful sources of radiation whose central engine is located in the core of the host galaxy. Blazar emission is dominated by non-thermal radiation from a jet that moves relativistically towards us, and therefore undergoes Doppler beaming. This beaming causes flux enhancem...

journal_title：Nature

authors： Raiteri CM,Villata M,Acosta-Pulido JA,Agudo I,Arkharov AA,Bachev R,Baida GV,Benítez E,Borman GA,Boschin W,Bozhilov V,Butuzova MS,Calcidese P,Carnerero MI,Carosati D,Casadio C,Castro-Segura N,Chen WP,Damljanovic G,D'

更新日期：2017-12-21 00:00:00

abstract：:Evolutionary adaptation can be rapid and potentially help species counter stressful conditions or realize ecological opportunities arising from climate change. The challenges are to understand when evolution will occur and to identify potential evolutionary winners as well as losers, such as species lacking adaptive c...

journal_title：Nature

authors： Hoffmann AA,Sgrò CM

更新日期：2011-02-24 00:00:00

abstract：:Endocytosis has long been thought of as simply a way for cells to internalize nutrients and membrane-associated molecules. But an explosive growth in knowledge has given a new dimension to our understanding of this process. It now seems that endocytosis is a master organizer of signalling circuits, with one of its mai...

journal_title：Nature

authors： Scita G,Di Fiore PP

更新日期：2010-01-28 00:00:00

abstract：:The evolutionary theory of ageing explains why ageing occurs, giving valuable insight into the mechanisms underlying the complex cellular and molecular changes that contribute to senescence. Such understanding also helps to clarify how the genome shapes the ageing process, thereby aiding the study of the genetic facto...

journal_title：Nature

authors： Kirkwood TB,Austad SN

更新日期：2000-11-09 00:00:00

abstract：:Co-evolution between plants and their natural enemies is generally believed to have generated much of the Earth's biological diversity. A process analogous to co-evolution occurs in agricultural systems, in which natural enemies adapt to crop resistance introduced by breeding or genetic engineering. Because of this si...

journal_title：Nature

authors： Rausher MD

更新日期：2001-06-14 00:00:00

abstract：:In nature, organisms are exposed to chronic low-dose ultraviolet light (CLUV) as opposed to the acute high doses common to laboratory experiments. Analysis of the cellular response to acute high-dose exposure has delineated the importance of direct DNA repair by the nucleotide excision repair pathway and for checkpoin...

journal_title：Nature

authors： Hishida T,Kubota Y,Carr AM,Iwasaki H

更新日期：2009-01-29 00:00:00

abstract：:Pathogenesis in sickle cell disease depends on the polymerization of deoxyhaemoglobin S into long fibres followed by 'gel' formation. The 'gelation' renders the affected erythrocytes less deformable than normal so that they obstruct the microvasculature and the 'gelation' process has been one of the targets for the de...

journal_title：Nature

authors： Briehl RW

更新日期：1980-12-11 00:00:00

abstract：:Cells sense the context in which they grow to adapt their phenotype and allow multicellular patterning by mechanisms of autocrine and paracrine signalling. However, patterns also form in cell populations exposed to the same signalling molecules and substratum, which often correlate with specific features of the popula...

journal_title：Nature

authors： Frechin M,Stoeger T,Daetwyler S,Gehin C,Battich N,Damm EM,Stergiou L,Riezman H,Pelkmans L

更新日期：2015-07-02 00:00:00

abstract：:T-lymphocyte co-recognition of antigen and major histocompatibility complex (MHC)-encoded molecules (such as murine Ia molecules) is thought to be mediated by a single cell-surface receptor, although the molecular mechanism by which this occurs is controversial (reviewed in ref. 1). One possibility is that the antigen...

journal_title：Nature

authors： Ashwell JD,Schwartz RH

更新日期：1986-03-13 00:00:00

abstract：:Mammalian cells proteolytically release (shed) the extracellular domains of many cell-surface proteins. Modification of the cell surface in this way can alter the cell's responsiveness to its environment and release potent soluble regulatory factors. The release of soluble tumour-necrosis factor-alpha (TNF-alpha) from...

journal_title：Nature

authors： Black RA,Rauch CT,Kozlosky CJ,Peschon JJ,Slack JL,Wolfson MF,Castner BJ,Stocking KL,Reddy P,Srinivasan S,Nelson N,Boiani N,Schooley KA,Gerhart M,Davis R,Fitzner JN,Johnson RS,Paxton RJ,March CJ,Cerretti DP

更新日期：1997-02-20 00:00:00

abstract：:Neptune has five narrow ring arcs, spanning about 40 degrees in longitude, which are apparently confined against the rapid azimuthal and radial spreading that normally results from inter-particle collisions. A gravitational resonance based on the vertical motion of the nearby neptunian moon Galatea was proposed to exp...

journal_title：Nature

authors： Namouni F,Porco C

更新日期：2002-05-02 00:00:00

abstract：:Regulation of transcription initiation by proteins binding at DNA sequences some distance from the promoter region itself seems to be a general phenomenon in both eukaryotes and prokaryotes. Proteins bound to an enhancer site in eukaryotes can turn on a distant gene, whereas efficient repression of some prokaryotic ge...

journal_title：Nature

authors： Dandanell G,Valentin-Hansen P,Larsen JE,Hammer K

更新日期：1987-02-26 00:00:00

abstract：:Large-conductance (BK type) Ca(2+)-dependent K(+) channels are essential for modulating muscle contraction and neuronal activities such as synaptic transmission and hearing. BK channels are activated by membrane depolarization and intracellular Ca(2+) and Mg(2+) (refs 6-10). The energy provided by voltage, Ca(2+) and ...

journal_title：Nature

authors： Shi J,Krishnamoorthy G,Yang Y,Hu L,Chaturvedi N,Harilal D,Qin J,Cui J

更新日期：2002-08-22 00:00:00

abstract：:Explaining altruistic cooperation is one of the greatest challenges for evolutionary biology. One solution to this problem is if costly cooperative behaviours are directed towards relatives. This idea of kin selection has been hugely influential and applied widely from microorganisms to vertebrates. However, a problem...

journal_title：Nature

authors： Griffin AS,West SA,Buckling A

更新日期：2004-08-26 00:00:00

abstract：:Abyssal-hill-bounding faults that pervade the oceanic crust are the most common tectonic feature on the surface of the Earth. The recognition that these faults form at plate spreading centres came with the plate tectonic revolution. Recent observations reveal a large range of fault sizes and orientations; numerical mo...

journal_title：Nature

authors： Buck WR,Lavier LL,Poliakov AN

更新日期：2005-04-07 00:00:00

abstract：:Mitochondrial cytochrome oxidase is a functionally complex, membrane-bound respiratory enzyme which catalyses both the reduction of O2 to water and proton-pumping. During respiration, an exogenous donor, cytochrome c, donates four electrons to O2 bound at the bimetallic haem alpha 3 Fe-Cu centre within the enzyme. The...

journal_title：Nature

authors： Wikström M

更新日期：1989-04-27 00:00:00

abstract：:CD4 and CD8 antigens are simultaneously expressed on most of the cortical thymocytes, that weakly express the T-cell antigen receptor(TCR)/CD3 complex. Mature peripheral T cells, however, strongly express the TCR complex and are positive for either CD4 or CD8. Nevertheless, a small percentage of peripheral CD3+ T cell...

journal_title：Nature

authors： Paliard X,Malefijt RW,de Vries JE,Spits H

更新日期：1988-10-13 00:00:00

abstract：:Cells are organized on length scales ranging from ångström to micrometres. However, the mechanisms by which ångström-scale molecular properties are translated to micrometre-scale macroscopic properties are not well understood. Here we show that interactions between diverse synthetic, multivalent macromolecules (includ...

journal_title：Nature

authors： Li P,Banjade S,Cheng HC,Kim S,Chen B,Guo L,Llaguno M,Hollingsworth JV,King DS,Banani SF,Russo PS,Jiang QX,Nixon BT,Rosen MK

更新日期：2012-03-07 00:00:00

abstract：:Integration of information between tyrosine kinase and G-protein-mediated pathways is necessary, but remains poorly understood. Here we use cells from transgenic mice harbouring inducible expression of RNA antisense to the gene encoding G ialpha2 to show that G ialpha2 is critical for insulin action. G ialpha2 deficie...

journal_title：Nature

authors： Moxham CM,Malbon CC

更新日期：1996-02-29 00:00:00

abstract：:Little is known about the biochemical or functional nature of the proteins encoded by the bcl-2 gene, which undergoes chromosomal translocation in approximately 85% of follicular lymphoma, 20% of diffuse large cell lymphoma and 10% of chronic lymphocytic leukaemia of B cells. Translocation of bcl-2 sequences from chro...

journal_title：Nature

authors： Haldar S,Beatty C,Tsujimoto Y,Croce CM

更新日期：1989-11-09 00:00:00

abstract：:A search for general regulators of cancer metastasis has yielded a set of microRNAs for which expression is specifically lost as human breast cancer cells develop metastatic potential. Here we show that restoring the expression of these microRNAs in malignant cells suppresses lung and bone metastasis by human cancer c...

journal_title：Nature

authors： Tavazoie SF,Alarcón C,Oskarsson T,Padua D,Wang Q,Bos PD,Gerald WL,Massagué J

更新日期：2008-01-10 00:00:00

abstract：:The complexity of ecosystems can cause subtle and chaotic responses to changes in external forcing. Although ecosystems may not normally behave chaotically, sensitivity to external influences associated with nonlinearity can lead to amplification of climatic signals. Strong correlations between an El Niño index and ra...

journal_title：Nature

authors： Taylor AH,Allen JI,Clark PA

更新日期：2002-04-11 00:00:00

abstract：:The cartilage and skin of animals, which are made up of more than fifty per cent water, are rather stiff (having elastic moduli of up to 100 megapascals) as well as tough and hard to break (with fracture energies of up to 9,000 joules per square metre). Such features make these biological materials mechanically superi...

journal_title：Nature

authors： Rauner N,Meuris M,Zoric M,Tiller JC

更新日期：2017-03-16 00:00:00

abstract：:The atmospheric partial pressure of carbon dioxide (p(CO(2))) will almost certainly be double that of pre-industrial levels by 2100 and will be considerably higher than at any time during the past few million years. The oceans are a principal sink for anthropogenic CO(2) where it is estimated to have caused a 30% incr...

journal_title：Nature

authors： Hall-Spencer JM,Rodolfo-Metalpa R,Martin S,Ransome E,Fine M,Turner SM,Rowley SJ,Tedesco D,Buia MC

更新日期：2008-07-03 00:00:00

abstract：:Tumour necrosis factor is a trimeric molecule, each subunit of which consists of an antiparallel beta-sandwich. Individual subunits from the trimer by a novel edge-to-face packing of beta-sheets. A comparison of the subunit fold with that of other proteins reveals a remarkable similarity to the 'jelly-roll' structural...

journal_title：Nature

authors： Jones EY,Stuart DI,Walker NP

更新日期：1989-03-16 00:00:00

abstract：:Oncogenic mutations in the serine/threonine kinase B-RAF (also known as BRAF) are found in 50-70% of malignant melanomas. Pre-clinical studies have demonstrated that the B-RAF(V600E) mutation predicts a dependency on the mitogen-activated protein kinase (MAPK) signalling cascade in melanoma-an observation that has bee...

journal_title：Nature

authors： Johannessen CM,Boehm JS,Kim SY,Thomas SR,Wardwell L,Johnson LA,Emery CM,Stransky N,Cogdill AP,Barretina J,Caponigro G,Hieronymus H,Murray RR,Salehi-Ashtiani K,Hill DE,Vidal M,Zhao JJ,Yang X,Alkan O,Kim S,Harris JL

更新日期：2010-12-16 00:00:00

abstract：:Nitrogen is an essential nutrient for all organisms that must have been available since the origin of life. Abiotic processes including hydrothermal reduction, photochemical reactions, or lightning discharge could have converted atmospheric N2 into assimilable NH4(+), HCN, or NOx species, collectively termed fixed nit...

journal_title：Nature

authors： Stüeken EE,Buick R,Guy BM,Koehler MC

更新日期：2015-04-30 00:00:00

abstract：:Paired-associate learning is often used to examine episodic memory in humans. Animal models include the recall of food-cache locations by scrub jays and sequential memory. Here we report a model in which rats encode, during successive sample trials, two paired associates (flavours of food and their spatial locations) ...

journal_title：Nature

authors： Day M,Langston R,Morris RG

更新日期：2003-07-10 00:00:00