U.S. biotechnology: living with regulation.

abstract：:Because their molecular signatures are often prominent in extracts of sediments, bacteria are thought to be important contributors to petroleum source beds. It has been shown recently, however, that abundances of biomarkers do not always reflect relative contributions to sedimentary organic carbon (Corg). The contrib...

journal_title：Nature

authors： Hartgers WA,Sinninghe Damste JS,Requejo AG,Allan J,Hayes JM,de Leeuw JW

更新日期：1994-05-19 00:00:00

abstract：:Immune recognition of protein antigens relies on the combined interaction of multiple antibody loops, which provide a fairly large footprint and constrain the size and shape of protein surfaces that can be targeted. Single protein loops can mediate extremely high-affinity binding, but it is unclear whether such a mech...

journal_title：Nature

authors： Ekiert DC,Kashyap AK,Steel J,Rubrum A,Bhabha G,Khayat R,Lee JH,Dillon MA,O'Neil RE,Faynboym AM,Horowitz M,Horowitz L,Ward AB,Palese P,Webby R,Lerner RA,Bhatt RR,Wilson IA

更新日期：2012-09-27 00:00:00

abstract：:Graphene, or single-layered graphite, with its high crystallinity and interesting semimetal electronic properties, has emerged as an exciting two-dimensional material showing great promise for the fabrication of nanoscale devices. Thin, elongated strips of graphene that possess straight edges, termed graphene ribbons,...

journal_title：Nature

authors： Kosynkin DV,Higginbotham AL,Sinitskii A,Lomeda JR,Dimiev A,Price BK,Tour JM

更新日期：2009-04-16 00:00:00

abstract：:Glandular epithelia, including the mammary and prostate glands, are composed of basal cells (BCs) and luminal cells (LCs)1,2. Many glandular epithelia develop from multipotent basal stem cells (BSCs) that are replaced in adult life by distinct pools of unipotent stem cells1,3-8. However, adult unipotent BSCs can react...

journal_title：Nature

authors： Centonze A,Lin S,Tika E,Sifrim A,Fioramonti M,Malfait M,Song Y,Wuidart A,Van Herck J,Dannau A,Bouvencourt G,Dubois C,Dedoncker N,Sahay A,de Maertelaer V,Siebel CW,Van Keymeulen A,Voet T,Blanpain C

更新日期：2020-08-01 00:00:00

abstract：:Complex-oxide materials exhibit a vast range of functional properties desirable for next-generation electronic, spintronic, magnetoelectric, neuromorphic, and energy conversion storage devices1-4. Their physical functionalities can be coupled by stacking layers of such materials to create heterostructures and can be f...

journal_title：Nature

authors： Kum HS,Lee H,Kim S,Lindemann S,Kong W,Qiao K,Chen P,Irwin J,Lee JH,Xie S,Subramanian S,Shim J,Bae SH,Choi C,Ranno L,Seo S,Lee S,Bauer J,Li H,Lee K,Robinson JA,Ross CA,Schlom DG,Rzchowski MS,Eom CB,Kim J

更新日期：2020-02-01 00:00:00

abstract：:Human cooperation in social dilemmas challenges researchers from various disciplines. Here we combine advances in experimental economics and evolutionary biology that separately have shown that costly punishment and reputation formation, respectively, induce cooperation in social dilemmas. The mechanisms of punishment...

journal_title：Nature

authors： Rockenbach B,Milinski M

更新日期：2006-12-07 00:00:00

abstract：:Acyclovir (9-[2-hydroxyethoxymethyl]guanine or ACV) is a nucleoside analogue with considerable potential for the treatment of herpes simplex virus (HSV) infections in man. Two virus-coded enzymes are important in the mechanism of action of this drug: thymidine kinase (TK) which initiates its activation by converting i...

journal_title：Nature

authors： Darby G,Field HJ,Salisbury SA

更新日期：1981-01-01 00:00:00

abstract：:Genomes from all of the crucial bacterial pathogens of humans, plants and animals have now been sequenced, as have genomes from many of the important commensal, symbiotic and environmental microorganisms. Analysis of these sequences has revealed the forces that shape pathogen evolution and has brought to light unexpec...

journal_title：Nature

authors： Pallen MJ,Wren BW

更新日期：2007-10-18 00:00:00

abstract：:The intracellular free Ca2+ ([Ca2+]i) regulates the K+ conductance (GK) of the many types of cell membrane. The Ca2+ influx during an action potential activates this [Ca2+]i-linked GK in most neurones. In caffeine-treated sympathetic ganglion cells, however, Ca2+ released from an intracellular Ca2+ reservoir site anal...

journal_title：Nature

authors： Morita K,Koketsu K,Kuba K

更新日期：1980-01-10 00:00:00

abstract：:Circumstellar accretion disks transfer matter from molecular clouds to young stars and to the sites of planet formation. The disks observed around pre-main-sequence stars have properties consistent with those expected for the pre-solar nebula from which our own Solar System formed 4.5 Gyr ago. But the 'debris' disks t...

journal_title：Nature

authors： Thi WF,Blake GA,van Dishoeck EF,van Zadelhoff GJ,Horn JM,Becklin EE,Mannings V,Sargent AI,van Den Ancker ME,Natta A

更新日期：2001-01-04 00:00:00

abstract：:High biodiversity has been shown to enhance ecological stability on small spatial scales and over intervals of weeks to decades. It remains unclear, however, whether this diversity-stability relationship can be scaled up to regional scales, or to longer timescales. Without empirical validation at larger scales, the im...

journal_title：Nature

authors： Kiessling W

更新日期：2005-01-27 00:00:00

abstract：:Established infections with the human and simian immunodeficiency viruses (HIV and SIV, respectively) are thought to be permanent with even the most effective immune responses and antiretroviral therapies only able to control, but not clear, these infections. Whether the residual virus that maintains these infections ...

journal_title：Nature

authors： Hansen SG,Piatak M Jr,Ventura AB,Hughes CM,Gilbride RM,Ford JC,Oswald K,Shoemaker R,Li Y,Lewis MS,Gilliam AN,Xu G,Whizin N,Burwitz BJ,Planer SL,Turner JM,Legasse AW,Axthelm MK,Nelson JA,Früh K,Sacha JB,Estes JD

更新日期：2013-10-03 00:00:00

abstract：:Neurons in the visual cortex typically respond selectively to the orientation, and velocity and direction of movement, of moving-bar stimuli. These responses are generally thought to provide information about the orientation and position of lines and edges in the visual field. Some cells are also endstopped, that is s...

journal_title：Nature

authors： Dobbins A,Zucker SW,Cynader MS

更新日期：1987-10-01 00:00:00

abstract：:Positive selection allows thymocytes that recognize an individual's own major histocompatibility complex (self-MHC) molecules to survive and differentiate, whereas negative selection removes overtly self-reactive thymocytes. Although both forms of thymic selection are mediated by the alphabeta T-cell receptor (TCR) an...

journal_title：Nature

authors： Werlen G,Hausmann B,Palmer E

更新日期：2000-07-27 00:00:00

abstract：:gamma-Aminobutyric acid (GABA) neurotransmission is widespread in vertebrate and invertebrate nervous systems. Here we use a genetic approach to identify molecules specific to GABA function. On the basis of the known in vivo roles of GABAergic neurons in controlling behaviour of the nematode Caenorhabditis elegans, we...

journal_title：Nature

authors： McIntire SL,Jorgensen E,Horvitz HR

更新日期：1993-07-22 00:00:00

abstract：:In this Letter, the top structure of the right panel of Fig. 1a should be that of cis-9-octadecenoic acid, not trans-9-octadecenoic acid. Please see the accompanying Author Correction. This error has not been corrected online. ...

journal_title：Nature

authors： Yang Z,Wei J,Sobolev YI,Grzybowski BA

更新日期：2019-03-01 00:00:00

abstract：:The initiation of immunoglobulin-E (IgE)-mediated allergic responses requires the binding of IgE antibody to its high-affinity receptor, Fc epsilonRI. Crosslinking of Fc epsilonRI initiates an intracellular signal transduction cascade that triggers the release of mediators of the allergic response. The interaction of ...

journal_title：Nature

authors： Garman SC,Wurzburg BA,Tarchevskaya SS,Kinet JP,Jardetzky TS

更新日期：2000-07-20 00:00:00

abstract：:'Pioneer' transcription factors are required for stem-cell pluripotency, cell differentiation and cell reprogramming1,2. Pioneer factors can bind nucleosomal DNA to enable gene expression from regions of the genome with closed chromatin. SOX2 is a prominent pioneer factor that is essential for pluripotency and self-re...

journal_title：Nature

authors： Dodonova SO,Zhu F,Dienemann C,Taipale J,Cramer P

更新日期：2020-04-01 00:00:00

abstract：:Recent studies have shown that normal cellular sequences on chromosome 13 are lost during the development of retinoblastomas and that sequences on chromosome 11 are similarly lost during the development of Wilms' kidney tumours and embryonal tumours. Cells from these tumors have been found to contain either the patern...

journal_title：Nature

authors： Fearon ER,Feinberg AP,Hamilton SH,Vogelstein B

更新日期：1985-11-28 00:00:00

abstract：:Throughout the lifespan of a plant, which in some cases can last more than one thousand years, the stem cell niches in the root and shoot apical meristems provide cells for the formation of complete root and shoot systems, respectively. Both niches are superficially different and it has remained unclear whether common...

journal_title：Nature

authors： Sarkar AK,Luijten M,Miyashima S,Lenhard M,Hashimoto T,Nakajima K,Scheres B,Heidstra R,Laux T

更新日期：2007-04-12 00:00:00

abstract：:High-temperature superconductivity is achieved by doping copper oxide insulators with charge carriers. The density of carriers in conducting materials can be determined from measurements of the Hall voltage--the voltage transverse to the flow of the electrical current that is proportional to an applied magnetic field....

journal_title：Nature

authors： Balakirev FF,Betts JB,Migliori A,Ono S,Ando Y,Boebinger GS

更新日期：2003-08-21 00:00:00

abstract：:Ten eleven translocation (TET) enzymes, including TET1, TET2 and TET3, convert 5-methylcytosine to 5-hydroxymethylcytosine and regulate gene transcription. However, the molecular mechanism by which TET family enzymes regulate gene transcription remains elusive. Using protein affinity purification, here we search for f...

journal_title：Nature

authors： Chen Q,Chen Y,Bian C,Fujiki R,Yu X

更新日期：2013-01-24 00:00:00

abstract：:Kinetoplastid RNA editing alters mitochondrial RNA transcripts by addition and deletion of uridine residues, producing open reading frames that may be twice as long as the original RNA. Although the COIII gene encoding cytochrome c oxidase subunit III in Trypanosoma brucei is edited along its entire length, the presum...

journal_title：Nature

authors： Landweber LF,Gilbert W

更新日期：1993-05-13 00:00:00

abstract：:With only a few exceptions that are well understood, conventional superconductivity does not coexist with long-range magnetic order (for example, ref. 1). Unconventional superconductivity, on the other hand, develops near a phase boundary separating magnetically ordered and magnetically disordered phases. A maximum in...

journal_title：Nature

authors： Park T,Ronning F,Yuan HQ,Salamon MB,Movshovich R,Sarrao JL,Thompson JD

更新日期：2006-03-02 00:00:00

abstract：:Receptors for excitatory amino acids in the mammalian central nervous system are classified into three major subtypes, ones which prefer N-methyl-D-aspartate (NMDA), quisqualate (QA), or kainate (KA) as type agonists respectively. These receptors are considered to mediate fast postsynaptic potentials by activating ion...

journal_title：Nature

authors： Sugiyama H,Ito I,Hirono C

更新日期：1987-02-05 00:00:00

abstract：:Octopamine is highly concentrated in neurones of several invertebrate species. Unlike in mammals, octopaminergic neurones in invertebrates are spatially separated from catecholaminergic neurons. In identified nerve cells of Aplysia, however, this amine coexists with other putative neurotransmitters. Octopamine is synt...

journal_title：Nature

authors： Axelrod J,Saavedra JM

更新日期：1977-02-10 00:00:00

abstract：:Amyloid B-protein/amyloid A4 is a peptide present in the neuritic plaques, neurofibrillary tangles and cerebrovascular deposits in patients with Alzheimer's disease and Down's syndrome (trisomy 21) and may be involved in the pathogenesis of Alzheimer's disease. Recent molecular genetic studies have indicated that amyl...

journal_title：Nature

authors： Tanzi RE,McClatchey AI,Lamperti ED,Villa-Komaroff L,Gusella JF,Neve RL

更新日期：1988-02-11 00:00:00

abstract：:The chemical induction of malignant transformation in BHK cells seems to result from a somatic mutation. Stable transformants, whose frequency is significantly increased by mutagenic carcinogens, can revert to normal and often display temperature-restricted phenotypes indicative of an altered gene product. ...

journal_title：Nature

authors： Bouck N,di Mayorca G

更新日期：1976-12-23 00:00:00

abstract：:Transparent electronic devices formed on flexible substrates are expected to meet emerging technological demands where silicon-based electronics cannot provide a solution. Examples of active flexible applications include paper displays and wearable computers. So far, mainly flexible devices based on hydrogenated amorp...

journal_title：Nature

authors： Nomura K,Ohta H,Takagi A,Kamiya T,Hirano M,Hosono H

更新日期：2004-11-25 00:00:00

abstract：:The 37-amino-acid calcitonin gene-related peptide (CGRP) occurs as a result of alternative processing of mRNA from the calcitonin gene. The potency of CGRP as a vasodilator and the occurrence of the peptide in nerves associated with blood vessels suggest an important role for CGRP in the regulation of blood flow. The ...

journal_title：Nature

authors： Brain SD,Williams TJ

更新日期：1988-09-01 00:00:00