Nanobacteria-like calcite single crystals at the surface of the Tataouine meteorite.

abstract：:Alterations in the activity/levels of the extralarge G protein α-subunit (XLαs) are implicated in various human disorders, such as perinatal growth retardation. Encoded by GNAS, XLαs is partly identical to the α-subunit of the stimulatory G protein (Gsα), but the cellular actions of XLαs remain poorly defined. Followi...

journal_title：Proceedings of the National Academy of Sciences of the United States of America

authors： He Q,Bouley R,Liu Z,Wein MN,Zhu Y,Spatz JM,Wang CY,Divieti Pajevic P,Plagge A,Babitt JL,Bastepe M

更新日期：2017-11-07 00:00:00

abstract：:Formation of duplex DNA from varphiX174 single-stranded DNA by extracts of E. coli was previously shown to require the gene product of dna B. Using as an assay the stimulation of varphiX174 DNA-dependent synthesis in inactivated extracts of dna B temperature-sensitive cells, we purified the dna B gene product from wil...

journal_title：Proceedings of the National Academy of Sciences of the United States of America

authors： Wright M,Wickner S,Hurwitz J

更新日期：1973-11-01 00:00:00

abstract：:The current model to explain the organization of the mammalian nervous system is based on studies of anatomy, embryology, and evolution. To further investigate the molecular organization of the adult mammalian brain, we have built a gene expression-based brain map. We measured gene expression patterns for 24 neural ti...

journal_title：Proceedings of the National Academy of Sciences of the United States of America

authors： Zapala MA,Hovatta I,Ellison JA,Wodicka L,Del Rio JA,Tennant R,Tynan W,Broide RS,Helton R,Stoveken BS,Winrow C,Lockhart DJ,Reilly JF,Young WG,Bloom FE,Lockhart DJ,Barlow C

更新日期：2005-07-19 00:00:00

abstract：:Nascent replicative form type II (RFII) DNA of coliphage M13 synthesized in an Escherichia coli mutant deficient in the 5' leads to 3' exonuclease associated uith DNA polymerase I contains ribonucleotides that are retained in the covalently closed RFI DNA sealed in vitro by the joint action of T5 phage DNA polymerase ...

journal_title：Proceedings of the National Academy of Sciences of the United States of America

authors： Dasgupta S,Mitra S

更新日期：1978-01-01 00:00:00

abstract：:X-ray grating interferometry is a coherent imaging technique that bears tremendous potential for three-dimensional tomographic imaging of soft biological tissue and other specimens whose details exhibit very weak absorption contrast. It is intrinsically trimodal, delivering phase contrast, absorption contrast, and sca...

journal_title：Proceedings of the National Academy of Sciences of the United States of America

authors： Zanette I,Bech M,Rack A,Le Duc G,Tafforeau P,David C,Mohr J,Pfeiffer F,Weitkamp T

更新日期：2012-06-26 00:00:00

abstract：:Defending cellular integrity against disturbances in intracellular concentrations of ATP ([ATP](i)) is predicated on coordinating the selection of substrates and their flux through metabolic pathways (metabolic signaling), ATP transfer from sites of production to utilization (energetic signaling), and the regulation o...

journal_title：Proceedings of the National Academy of Sciences of the United States of America

authors： Ruiz-Stewart I,Tiyyagura SR,Lin JE,Kazerounian S,Pitari GM,Schulz S,Martin E,Murad F,Waldman SA

更新日期：2004-01-06 00:00:00

abstract：:A longstanding problem in the social, biological, and computational sciences is to determine how groups of distributed individuals can form intelligent collective judgments. Since Galton's discovery of the "wisdom of crowds" [Galton F (1907) Nature 75:450-451], theories of collective intelligence have suggested that t...

journal_title：Proceedings of the National Academy of Sciences of the United States of America

authors： Becker J,Brackbill D,Centola D

更新日期：2017-06-27 00:00:00

abstract：:Avian homologues of mammalian gamma delta and alpha beta T-cell antigen receptors, TCR1 and TCR2, have been identified with monoclonal antibodies. These TCR isotypes are associated with the avian CD3 proteins on the T-cell surface. During chick development, T-cell subpopulations bearing CD3/TCR1 or CD3/TCR2 receptor c...

journal_title：Proceedings of the National Academy of Sciences of the United States of America

authors： Chen CH,Sowder JT,Lahti JM,Cihak J,Lösch U,Cooper MD

更新日期：1989-04-01 00:00:00

abstract：:Newly formed hepatic granulomas around Schistosoma mansoni eggs become progressively smaller during the chronic (greater than or equal to 15 weeks after infection) phase of the disease. This reduction in granuloma size, termed "modulation," is known to be caused in part by a T lymphocyte that can adoptively transfer m...

journal_title：Proceedings of the National Academy of Sciences of the United States of America

authors： Green WF,Colley DG

更新日期：1981-02-01 00:00:00

abstract：:The Hairy-related transcription-factor (HRT) genes encode three related basic helix-loop-helix transcription factors that show sequence similarity to the Hairy and Enhancer of split family of transcriptional repressors. HRT proteins are expressed in specific regions of the developing heart, vasculature, pharyngeal arc...

journal_title：Proceedings of the National Academy of Sciences of the United States of America

authors： Nakagawa O,McFadden DG,Nakagawa M,Yanagisawa H,Hu T,Srivastava D,Olson EN

更新日期：2000-12-05 00:00:00

abstract：:The rat calbindin D-9k gene is transcriptionally regulated by 1,25-dihydroxyvitamin D3 in the intestine. We have examined the 5'-flanking region of this gene and identified a 1,25-dihydroxyvitamin D3-responsive element (DRE) between nucleotides -489 and -445. This element confers 1,25-dihydroxyvitamin D3 responsivenes...

journal_title：Proceedings of the National Academy of Sciences of the United States of America

authors： Darwish HM,DeLuca HF

更新日期：1992-01-15 00:00:00

abstract：:We study static and dynamical properties that distinguish 2D crystals constrained to lie on a curved substrate from their flat-space counterparts. A generic mechanism of dislocation unbinding in the presence of varying Gaussian curvature is presented in the context of a model surface amenable to full analytical treatm...

journal_title：Proceedings of the National Academy of Sciences of the United States of America

authors： Vitelli V,Lucks JB,Nelson DR

更新日期：2006-08-15 00:00:00

abstract：:The role played by oligodendrocytes (OLs), the myelinating cells of the CNS, during brain development has not been fully explored. We have addressed this question by inducing a temporal and reversible ablation of OLs on postnatal CNS development. OL ablation in newborn mice leads to a profound alteration in the struct...

journal_title：Proceedings of the National Academy of Sciences of the United States of America

authors： Collin L,Usiello A,Erbs E,Mathis C,Borrelli E

更新日期：2004-01-06 00:00:00

abstract：:Blue mold of tobacco is caused by the fungus Peronospora tabacina. Its spores are released in the morning when the relative humidity falls, but they require free water for germination. Traditionally, the walls of the shade tents are raised to control the pathogen by drying leaves. We show that raising the walls does n...

journal_title：Proceedings of the National Academy of Sciences of the United States of America

authors： Aylor DE,Taylor GS

更新日期：1982-01-01 00:00:00

abstract：:Apomixis is a naturally occurring mode of reproduction that results in embryo formation without the involvement of meiosis or fertilization of the egg. Seed-derived progeny of an apomictic plant are genetically identical to the maternal parent. We are studying a form of apomixis called apospory that occurs in the genu...

journal_title：Proceedings of the National Academy of Sciences of the United States of America

authors： Ozias-Akins P,Roche D,Hanna WW

更新日期：1998-04-28 00:00:00

abstract：:The UV photodissociation kinetics of tryptophan amino acid, Trp, attached to the membrane of bacteria, Escherichia coli and Bacillus subtilis, have been studied by means of normal and synchronous fluorescence. Our experimental data suggest that the fluorescence intensity of Trp increases during the first minute of irr...

journal_title：Proceedings of the National Academy of Sciences of the United States of America

authors： Li R,Dhankhar D,Chen J,Cesario TC,Rentzepis PM

更新日期：2019-09-17 00:00:00

abstract：:Quaking(viable) (qk(v)) is a recessive neurological mouse mutation with severe dysmyelination of the CNS and spermiogenesis failure. The molecular lesion in the qk(v) mutant is a deletion of approximately 1 Mb on mouse chromosome 17 that alters the expression of the qk gene in oligodendrocytes. Complementation analysi...

journal_title：Proceedings of the National Academy of Sciences of the United States of America

authors： Lorenzetti D,Bishop CE,Justice MJ

更新日期：2004-06-01 00:00:00

abstract：:Previous reconstructions of marine fishing fleets have aggregated data without regard to the artisanal and industrial sectors. Engine power has often been estimated from subsets of the developed world, leading to inflated results. We disaggregated data into three sectors, artisanal (unpowered/powered) and industrial, ...

journal_title：Proceedings of the National Academy of Sciences of the United States of America

authors： Rousseau Y,Watson RA,Blanchard JL,Fulton EA

更新日期：2019-06-18 00:00:00

abstract：:Calcium-dependent protein kinases (CDPKs) comprise the major group of Ca2+-regulated kinases in plants and protists. It has long been assumed that CDPKs are activated, like other Ca2+-regulated kinases, by derepression of the kinase domain (KD). However, we found that removal of the autoinhibitory domain from Toxoplas...

journal_title：Proceedings of the National Academy of Sciences of the United States of America

authors： Ingram JR,Knockenhauer KE,Markus BM,Mandelbaum J,Ramek A,Shan Y,Shaw DE,Schwartz TU,Ploegh HL,Lourido S

更新日期：2015-09-08 00:00:00

abstract：:Adenosine has been identified in the anterior pituitary gland and is secreted from cultured folliculostellate (FS) cells. To determine whether adenosine controls the secretion of anterior pituitary hormones in vitro, adenosine was incubated with anterior pituitaries. It stimulated prolactin (PRL) release at the lowest...

journal_title：Proceedings of the National Academy of Sciences of the United States of America

authors： Yu WH,Kimura M,Walczewska A,Porter JC,McCann SM

更新日期：1998-06-23 00:00:00

abstract：:The amount of information that can be stored in working memory is limited but may be improved with practice. The basis of improved efficiency at the level of neural activity is unknown. To investigate this question, we trained monkeys to perform a working memory task that required memory for multiple stimuli. Performa...

journal_title：Proceedings of the National Academy of Sciences of the United States of America

authors： Tang H,Qi XL,Riley MR,Constantinidis C

更新日期：2019-04-02 00:00:00

abstract：:An endonucleolytic activity is associated with purified PM(2) bacteriophages. It converts the double-stranded supercoiled PM(2) DNA mostly into the linear form that sediments as a homogenous peak in alkaline sucrose gradients. The same activity is found in intact or detergent-lysed phages. Optimal activity is observed...

journal_title：Proceedings of the National Academy of Sciences of the United States of America

authors： Laval F

更新日期：1974-12-01 00:00:00

abstract：:There are large amounts of histone mRNA present in mouse eggs. These RNAs are rapidly degraded, as are other mRNAs, after fertilization and prior to the second cleavage. During cleavage, the histone mRNA accumulates as the embryo divides. The same sets of histone genes are expressed in eggs and embryos, although there...

journal_title：Proceedings of the National Academy of Sciences of the United States of America

authors： Graves RA,Marzluff WF,Giebelhaus DH,Schultz GA

更新日期：1985-09-01 00:00:00

abstract：:Interleukin (IL)-15 and its specific receptor chain, IL-15Rα, support the development of various effector cells, including NK and CD8 T cells via a mechanism called trans-presentation. Whereas the dynamic of trans-presentation has been shown to involve the recycling of IL-15Rα by presenting cells, the way responding c...

journal_title：Proceedings of the National Academy of Sciences of the United States of America

authors： Tamzalit F,Barbieux I,Plet A,Heim J,Nedellec S,Morisseau S,Jacques Y,Mortier E

更新日期：2014-06-10 00:00:00

abstract：:Very thin (2.3-5.5 nm) self-assembled organic dielectric multilayers have been integrated into organic thin-film transistor structures to achieve sub-1-V operating characteristics. These new dielectrics are fabricated by means of layer-by-layer solution phase deposition of molecular silicon precursors, resulting in sm...

journal_title：Proceedings of the National Academy of Sciences of the United States of America

authors： Yoon MH,Facchetti A,Marks TJ

更新日期：2005-03-29 00:00:00

abstract：:Glucose-6-phosphate dehydrogenase (G6PD) deficiency is the most common blood disorder, presenting multiple symptoms, including hemolytic anemia. It affects 400 million people worldwide, with more than 160 single mutations reported in G6PD. The most severe mutations (about 70) are classified as class I, leading to more...

journal_title：Proceedings of the National Academy of Sciences of the United States of America

authors： Horikoshi N,Hwang S,Gati C,Matsui T,Castillo-Orellana C,Raub AG,Garcia AA,Jabbarpour F,Batyuk A,Broweleit J,Xiang X,Chiang A,Broweleit R,Vöhringer-Martinez E,Mochly-Rosen D,Wakatsuki S

更新日期：2021-01-26 00:00:00

abstract：:Global activation of the embryonic genome is the most critical event in early mammalian development. After fertilization, a rich supply of maternal proteins and RNAs support development whereas a number of zygotic and embryonic genes are expressed in a stage-specific manner leading to embryonic genome activation (EGA)...

journal_title：Proceedings of the National Academy of Sciences of the United States of America

authors： Misirlioglu M,Page GP,Sagirkaya H,Kaya A,Parrish JJ,First NL,Memili E

更新日期：2006-12-12 00:00:00

abstract：:Field cancerization predisposes the upper aerodigestive tract mucosa to the formation of multiple primary tumors, when exposed to environmental carcinogens. Up-regulation of epidermal growth factor receptor occurs early in squamous cell carcinogenesis and is critical for the loss of growth control in a variety of huma...

journal_title：Proceedings of the National Academy of Sciences of the United States of America

authors： Grandis JR,Drenning SD,Zeng Q,Watkins SC,Melhem MF,Endo S,Johnson DE,Huang L,He Y,Kim JD

更新日期：2000-04-11 00:00:00

abstract：:In contrast to observations in bacteria and fungi, frameshift mutations in bacteriophage T4 do not arise during genetic recombination. Nascent mutants, captured in the heterozygous condition, exhibit properties which indicate that the new lesions are located at the extreme tips of the chromosomes, and are segregated b...

journal_title：Proceedings of the National Academy of Sciences of the United States of America

authors： Lindstrom DM,Drake JW

更新日期：1970-03-01 00:00:00

abstract：:Rat adrenal mitochondria accumulated cholesterol during ether stress in vivo when side-chain cleavage was inhibited by aminoglutethimide (control = 14.6 vs. aminoglutethimide = 26.5 micrograms of cholesterol per mg of protein). This accumulation was insensitive to simultaneous administration of cycloheximide (24.2 mic...

journal_title：Proceedings of the National Academy of Sciences of the United States of America

authors： Privalle CT,Crivello JF,Jefcoate CR

更新日期：1983-02-01 00:00:00