Calcium currents recorded from a vertebrate presynaptic nerve terminal are resistant to the dihydropyridine nifedipine.

abstract：:Small RNAs (sRNAs) are hypothesized to contribute to hybrid vigor because they maintain genome integrity, contribute to genetic diversity, and control gene expression. We used Illumina sequencing to assess how sRNA populations vary between two maize inbred lines (B73 and Mo17) and their hybrid. We sampled sRNAs from t...

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

authors： Barber WT,Zhang W,Win H,Varala KK,Dorweiler JE,Hudson ME,Moose SP

更新日期：2012-06-26 00:00:00

abstract：:Bacterial virulence factors are typically surface-associated or secreted molecules that in Gram-negative bacteria must cross the outer membrane (OM). Protein translocation across the bacterial OM is not well understood. To elucidate this process we studied P pilus biogenesis in Escherichia coli. We present high-resolu...

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

authors： Thanassi DG,Saulino ET,Lombardo MJ,Roth R,Heuser J,Hultgren SJ

更新日期：1998-03-17 00:00:00

abstract：:Repeated within-day testing on a texture discrimination task leads to retinotopically specific decreases in performance. Although perceptual learning has been shown to be highly specific to the retinotopic location and characteristics of the trained stimulus, the specificity of perceptual deterioration has not been st...

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

authors： Mednick SC,Arman AC,Boynton GM

更新日期：2005-03-08 00:00:00

abstract：:A method is proposed for rapidly, quantitatively comparing protein structures of arbitrary sizes, based on the differential geometric representation. The method is applied to a group of 22 protein x-ray structures, and the resulting network of closest relationships is delineated. Several well-known fold types are auto...

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

authors： Rackovsky S,Goldstein DA

更新日期：1988-02-01 00:00:00

abstract：:Tumor growth requires neoangiogenesis. VEGF is the most potent proangiogenic factor. Dysregulation of hypoxia-inducible factor (HIF) or cytokine stimuli such as those involving the chemokine receptor 4/stromal-derived cell factor 1 (CXCR4/SDF-1) axis are the major cause of ectopic overexpression of VEGF in tumors. Alt...

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

authors： de Nigris F,Crudele V,Giovane A,Casamassimi A,Giordano A,Garban HJ,Cacciatore F,Pentimalli F,Marquez-Garban DC,Petrillo A,Cito L,Sommese L,Fiore A,Petrillo M,Siani A,Barbieri A,Arra C,Rengo F,Hayashi T,Al-Omran M,

更新日期：2010-08-10 00:00:00

abstract：:The cdc25 phosphatases play key roles in cell cycle progression by activating cyclin-dependent kinases. Two members of the 14-3-3 protein family have been isolated in a yeast two-hybrid screen designed to identify proteins that interact with the human cdc25A and cdc25B phosphatases. Genes encoding the human homolog of...

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

authors： Conklin DS,Galaktionov K,Beach D

更新日期：1995-08-15 00:00:00

abstract：:Global supply chains play a critical role in many of the most pressing environmental stresses and social struggles identified by the United Nations' Sustainable Development Goals (SDGs). Responding to calls from the global community, companies are adopting a variety of voluntary practices to improve the environmental ...

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

authors： Thorlakson T,de Zegher JF,Lambin EF

更新日期：2018-02-27 00:00:00

abstract：:Adenylate cyclase [ATP pyrophosphate-lyase (cyclizing), EC 4.6.1.1] activity of purified secretory vesicle membranes from the adrenal medulla is inhibited by I-isoproterenol and I-epinephrine, as well as by nerve growth factor (NGF). The effect of these agents was found to be dose-dependent and, in the case of the cat...

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

authors： Nikodijevic O,Nikodijevic B,Zinder O,Yu MY,Guroff G,Pollard HB

更新日期：1976-03-01 00:00:00

abstract：:Commonly considered strategies for reducing the environmental impact of light-duty transportation include using alternative fuels and improving vehicle fuel economy. We evaluate the air quality-related human health impacts of 10 such options, including the use of liquid biofuels, diesel, and compressed natural gas (CN...

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

authors： Tessum CW,Hill JD,Marshall JD

更新日期：2014-12-30 00:00:00

abstract：:Selection is widely accepted as the principal force shaping phenotypic variation within populations. Its importance in speciation and macroevolution has been questioned, however, because phenotypic differences between species or higher taxa sometimes appear to be nonadaptive. Here, we use the quantitative trait locus ...

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

authors： Rieseberg LH,Widmer A,Arntz AM,Burke JM

更新日期：2002-09-17 00:00:00

abstract：:We investigated the manner in which the sea urchin larva takes up calcium from its body cavity into the primary mesenchymal cells (PMCs) that are responsible for spicule formation. We used the membrane-impermeable fluorescent dye calcein and alexa-dextran, with or without a calcium channel inhibitor, and imaged the la...

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

authors： Vidavsky N,Addadi S,Schertel A,Ben-Ezra D,Shpigel M,Addadi L,Weiner S

更新日期：2016-11-08 00:00:00

abstract：:The CD8 dimer interacts with the alpha 3 domain of major histocompatibility complex class I molecules through two immunoglobulin variable-like domains. In this study a crystal structure-informed mutational analysis has been performed to identify amino acids in the CD8 alpha/alpha homodimer that are likely to be involv...

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

authors： Giblin PA,Leahy DJ,Mennone J,Kavathas PB

更新日期：1994-03-01 00:00:00

abstract：:The phosphoinositide 3-kinase (PI3K)/protein kinase B (Akt) signaling pathway was recently shown to negatively regulate LPS-induced acute inflammatory responses. We previously observed that the metabolic thiol antioxidant alpha-lipoic acid (LA) inhibits LPS-induced expression of cellular adhesion molecules and adheren...

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

authors： Zhang WJ,Wei H,Hagen T,Frei B

更新日期：2007-03-06 00:00:00

abstract：:The neutrality theory predicts that the rate of neutral molecular evolution is constant over time, and thus that there is a molecular clock for timing evolutionary events. It has been observed that the variance of the rate of evolution is generally larger than expected according to the neutrality theory, which has rai...

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

authors： Rodríguez-Trelles F,Tarrío R,Ayala FJ

更新日期：2001-09-25 00:00:00

abstract：:Subtractive library construction and differential screening were used to identify a cDNA for a cell type-specific immediate early gene induced in rat PC12 pheochromocytoma cells. Sequencing identified the protein product of this gene as rat synaptotagmin IV (SytIV). Synaptotagmins are synaptic vesicle proteins thought...

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

authors： Vician L,Lim IK,Ferguson G,Tocco G,Baudry M,Herschman HR

更新日期：1995-03-14 00:00:00

abstract：:The photosystem II (PSII) subunit S (PsbS) plays a key role in nonphotochemical quenching, a photoprotective mechanism for dissipation of excess excitation energy in plants. The precise function of PsbS in nonphotochemical quenching is unknown. By reconstituting PsbS together with the major light-harvesting complex of...

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

authors： Wilk L,Grunwald M,Liao PN,Walla PJ,Kühlbrandt W

更新日期：2013-04-02 00:00:00

abstract：:Oxygen-derived free radicals have been implicated in the pathogenesis of vasogenic edema and infarction caused by ischemia and reperfusion injury. In earlier studies, exogenously supplied liposome-entrapped CuZn superoxide dismutase (CuZn-SOD) ameliorated ischemic brain edema and infarction in rats following focal cer...

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

authors： Kinouchi H,Epstein CJ,Mizui T,Carlson E,Chen SF,Chan PH

更新日期：1991-12-15 00:00:00

abstract：:Staphylococcus aureus is a major cause of community-acquired and nosocomial infections including the life-threatening conditions endocarditis, necrotizing pneumonia, necrotizing fasciitis, and septicemia. Toll-like receptor (TLR)-2, a membrane-bound microbial sensor, detects staphylococcal components, but macrophages ...

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

authors： Hruz P,Zinkernagel AS,Jenikova G,Botwin GJ,Hugot JP,Karin M,Nizet V,Eckmann L

更新日期：2009-08-04 00:00:00

abstract：:The wide diversity of dendritic trees is one of the most striking features of neural circuits. Here we develop a general quantitative theory relating the total length of dendritic wiring to the number of branch points and synapses. We show that optimal wiring predicts a 2/3 power law between these measures. We demonst...

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

authors： Cuntz H,Mathy A,Häusser M

更新日期：2012-07-03 00:00:00

abstract：:Urea (200-400 milliosmolar) activates transcription, translation of, and trans-activation by the immediate-early gene transcription factor Egr-1 in a renal epithelial cell-specific fashion. The effect at the transcriptional level has been attributed to multiple serum response elements and their adjacent Ets motifs loc...

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

authors： Cohen DM

更新日期：1996-10-01 00:00:00

abstract：:Unlike αβ-T lineage cells, where the role of ligand in intrathymic selection is well established, the role of ligand in the development of γδ-T cells remains controversial. Here we provide evidence for the role of a bona fide selecting ligand in shaping the γδ-T cell-receptor (TCR) repertoire. Reactivity of the γδ-TCR...

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

authors： Fahl SP,Coffey F,Kain L,Zarin P,Dunbrack RL Jr,Teyton L,Zúñiga-Pflücker JC,Kappes DJ,Wiest DL

更新日期：2018-02-20 00:00:00

abstract：:Viruses are the most common biological entities in the oceans by an order of magnitude. However, very little is known about their diversity. Here we report a genomic analysis of two uncultured marine viral communities. Over 65% of the sequences were not significantly similar to previously reported sequences, suggestin...

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

authors： Breitbart M,Salamon P,Andresen B,Mahaffy JM,Segall AM,Mead D,Azam F,Rohwer F

更新日期：2002-10-29 00:00:00

abstract：:An evolutionarily ancient plant hormone receptor complex comprising the α/β-fold hydrolase receptor KARRIKIN INSENSITIVE 2 (KAI2) and the F-box protein MORE AXILLARY GROWTH 2 (MAX2) mediates a range of developmental responses to smoke-derived butenolides called karrikins (KARs) and to yet elusive endogenous KAI2 ligan...

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

authors： Carbonnel S,Das D,Varshney K,Kolodziej MC,Villaécija-Aguilar JA,Gutjahr C

更新日期：2020-09-01 00:00:00

abstract：:We present here direct evidence for the preservation of a transcriptional initiation sequence in a eukaryotic rRNA precursor: the 5'-end group for precursor to 17S rRNA (p17S RNA) from Dictyostelium discoideum is identified as the triphosphate residue pppA-. We also show that mature 5S RNA form Dictyostelium bears a d...

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

authors： Batts-Young B,Lodish HF

更新日期：1978-02-01 00:00:00

abstract：:The high excitation energy-transfer efficiency demanded in photosynthetic organisms relies on the optimal pigment-protein binding orientation in the individual protein complexes and also on the overall architecture of the photosystem. In green sulfur bacteria, the membrane-attached Fenna-Matthews-Olson (FMO) antenna p...

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

authors： Wen J,Zhang H,Gross ML,Blankenship RE

更新日期：2009-04-14 00:00:00

abstract：:The mitochondrial genome of the S-type male-sterile cytoplasm of maize contains two linear episomes, S1 (6397 base pairs) and S2 (5453 base pairs). The S2 episome contains two large unidentified open reading frames, URF1 (3512 base pairs) and URF2 (1017 base pairs). We have demonstrated that a polypeptide with an appa...

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

authors： Zabala G,O'brien-Vedder C,Walbot V

更新日期：1987-11-01 00:00:00

abstract：:A polypeptide was purified from rat hypothalamic extracts on the basis of its high intrinsic activity to release corticotropin (ACTH) from cultured rat anterior pituitary cells and its immunoactivity in a radioimmunoassay directed against the NH2 terminus (residues 4-20) of ovine hypothalamic corticotropin-releasing f...

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

authors： Rivier J,Spiess J,Vale W

更新日期：1983-08-01 00:00:00

abstract：:The method of matrix isolation has been used to investigate mechanisms of gas-phase chemical reactions, in particular the pyrolysis of some organomercury compounds. A molecular beam of pyrolysis products was condensed simultaneously with a large excess of rare gas at temperatures from 5 to 15 degrees K to form a matri...

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

authors： Maltsev AK,Mikaelian RG,Nefedov OM,Hauge RH,Margrave JL

更新日期：1971-12-01 00:00:00

abstract：:Persistent organic pollutants (POPs) have been associated with a wide range of adverse health effects. Our case-control study was performed to explore the association between placental levels of selected POPs and risks for neural tube defects (NTDs) in a Chinese population with a high prevalence of NTDs. Cases include...

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

authors： Ren A,Qiu X,Jin L,Ma J,Li Z,Zhang L,Zhu H,Finnell RH,Zhu T

更新日期：2011-08-02 00:00:00

abstract：:Murine Ly-6-encoded molecules play an important role in the antigen-independent activation of lymphocytes. We have described the cloning of a cDNA encoding the protein component of an Ly-6 molecule. Hybridization studies indicated that this cDNA identified multiple DNA fragments on Southern blots. The banding pattern ...

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

authors： LeClair KP,Rabin M,Nesbitt MN,Pravtcheva D,Ruddle FH,Palfree RG,Bothwell A

更新日期：1987-03-01 00:00:00