Selective expression of a plasmid cat gene at a late stage of Bacillus subtilis sporulation.

abstract：:A site that is preferentially cleaved by the single-strand-specific endonuclease from Aspergillus oryzae was located in vitro 180 base pairs upstream from the 5' end of the chicken pro-alpha 2(I) collagen gene. It is found in supercoiled plasmids with a negative superhelical density of -0.024 or more but not in linear...

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

authors： Finer MH,Fodor EJ,Boedtker H,Doty P

更新日期：1984-03-01 00:00:00

abstract：:Transcriptional regulation by nuclear hormone receptors is thought to involve interactions with putative cofactors that may potentiate receptor function. Here we show that human thyroid hormone receptor alpha purified from HeLa cells grown in the presence of thyroid hormone (T3) is associated with a group of distinct ...

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

authors： Fondell JD,Ge H,Roeder RG

更新日期：1996-08-06 00:00:00

abstract：:The completion of the human genome draft has taken several years and is only the beginning of a period in which large amounts of DNA and RNA sequence information will be required from many individuals and species. Conventional sequencing technology has limitations in cost, speed, and sensitivity, with the result that ...

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

authors： Braslavsky I,Hebert B,Kartalov E,Quake SR

更新日期：2003-04-01 00:00:00

abstract：:Angiogenin, a potent inducer of neovascularization in the chicken chorioallantoic membrane and rabbit cornea, promotes endothelial cell invasion of Matrigel basement membrane. A transformed bovine aortic endothelial cell line, GM 7373, is 5 times more invasive when cultured in the presence of 1 microgram of bovine ang...

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

authors： Hu G,Riordan JF,Vallee BL

更新日期：1994-12-06 00:00:00

abstract：:Two pools of heparan sulfate proteoglycans have been selectively solubilized from rat liver plasma membranes by successive incubations with heparin and detergent. The two populations of proteoglycans have similar polyanionic properties as indicated by identical elution positions on ion-exchange chromatography on DEAE-...

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

authors： Kjellén L,Pettersson I,Höök M

更新日期：1981-09-01 00:00:00

abstract：:Endangered species recovery programs seek to restore populations to self-sustaining levels. Nonetheless, many recovering species require continuing management to compensate for persistent threats in their environment. Judging true recovery in the face of this management is often difficult, impeding thorough analysis o...

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

authors： Finkelstein ME,Doak DF,George D,Burnett J,Brandt J,Church M,Grantham J,Smith DR

更新日期：2012-07-10 00:00:00

abstract：:Usual human livers contain two major aldehyde dehydrogenase [(ALDH) aldehyde:NAD+ oxidoreductase] isozymes--i.e., a cytosolic ALDH1 component and a mitochondrial ALDH2 component--whereas approximately equal to 50% of Orientals are "atypical" and have only the ALDH1 isozyme and are missing the ALDH2 isozyme. We previou...

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

authors： Yoshida A,Huang IY,Ikawa M

更新日期：1984-01-01 00:00:00

abstract：:Recent experimental data on the equilibrium binding of myosin subfragment 1 (S-1) to regulated actin filaments in the presence and in the absence of Ca(2+) are analyzed by using a linear Ising model. In the model, each tropomyosin-troponin unit (including seven sites on the actin filament) can be in one of two possibl...

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

authors： Hill TL,Eisenberg E,Greene L

更新日期：1980-06-01 00:00:00

abstract：:Plasmid pT181 is a 4437-base-pair, multicopy plasmid of Staphylococcus aureus that encodes tetracycline resistance. The replication of the leading strand of pT181 DNA initiates by covalent extension of a site-specific nick generated by the initiator protein at the origin of replication and proceeds by an asymmetric ro...

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

authors： Birch P,Khan SA

更新日期：1992-01-01 00:00:00

abstract：:During tRNA biosynthesis the 5'-leader sequences in precursor tRNAs are removed by the ribonucleoprotein RNase P, an enzyme whose RNA moiety is required for activity. To clarify some aspects of the enzyme mechanism, we examined substrate binding and product formation with mutant precursor tRNAs. Mutations G-1----A or ...

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

authors： Nichols M,Söll D,Willis I

更新日期：1988-03-01 00:00:00

abstract：:The robustness of eight common food web properties is examined with respect to web size. We show that the current controversy concerning the scale dependence or scale invariance of these properties can be resolved by accounting for scaling constraints introduced by webs of very small size. We demonstrate statistically...

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

authors： Bersier LF,Sugihara G

更新日期：1997-02-18 00:00:00

abstract：:On April 20, 2010, the Deepwater Horizon (DWH) blowout occurred, releasing more oil than any accidental spill in history. Oil release continued for 87 d and much of the oil and gas remained in, or returned to, the deep sea. A coral community significantly impacted by the spill was discovered in late 2010 at 1,370 m de...

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

authors： Fisher CR,Hsing PY,Kaiser CL,Yoerger DR,Roberts HH,Shedd WW,Cordes EE,Shank TM,Berlet SP,Saunders MG,Larcom EA,Brooks JM

更新日期：2014-08-12 00:00:00

abstract：:A temperature-sensitive (ts) mutant, GA 907/7, was isolated after mutagen treatment of avian myeloblastosis virus. When bone marrow cells or secondary yolk sac macrophages were infected with GA 907/7, the expression of transformation was greatly reduced at 41 degrees C. The results of temperature-shift experiments sug...

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

authors： Moscovici MG,Moscovici C

更新日期：1983-03-01 00:00:00

abstract：:When infants and adults communicate, they exchange social signals of availability and communicative intention such as eye gaze. Previous research indicates that when communication is successful, close temporal dependencies arise between adult speakers' and listeners' neural activity. However, it is not known whether s...

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

authors： Leong V,Byrne E,Clackson K,Georgieva S,Lam S,Wass S

更新日期：2017-12-12 00:00:00

abstract：:The c-Jun NH(2)-terminal kinase (JNK) is activated when cells are exposed to environmental stress, including UV radiation. Gene disruption studies demonstrate that JNK is essential for UV-stimulated apoptosis mediated by the mitochondrial pathway by a Bax/Bak-dependent mechanism. Here, we demonstrate that JNK phosphor...

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

authors： Lei K,Davis RJ

更新日期：2003-03-04 00:00:00

abstract：:The failure of the population of microjunctions forming the frictional interface between two solids is central to fields ranging from biomechanics to seismology. This failure is mediated by the propagation along the interface of various types of rupture fronts, covering a wide range of velocities. Among them are the s...

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

authors： Trømborg JK,Sveinsson HA,Scheibert J,Thøgersen K,Amundsen DS,Malthe-Sørenssen A

更新日期：2014-06-17 00:00:00

abstract：:The density of corn pollen on leaves of milkweed plants inside and outside of cornfields was measured in several studies from different localities. The purpose was to obtain a representative picture of naturally occurring pollen densities to provide a perspective for laboratory and field studies of monarch larvae feed...

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

authors： Pleasants JM,Hellmich RL,Dively GP,Sears MK,Stanley-Horn DE,Mattila HR,Foster JE,Clark P,Jones GD

更新日期：2001-10-09 00:00:00

abstract：:The hallmark of the menstrual cycle is extensive steroid-dependent tissue turnover. Estrogen mediates endometrial cell growth and structural remodeling, whereas progesterone suppresses estrogen-dependent proliferation and promotes cellular differentiation. In nonfertile cycles, tissue degradation and menstruation occu...

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

authors： Osteen KG,Rodgers WH,Gaire M,Hargrove JT,Gorstein F,Matrisian LM

更新日期：1994-10-11 00:00:00

abstract：:We recognize, understand, and interact with objects through both vision and touch. Conceivably, these two sensory systems encode object shape in similar ways, which could facilitate cross-modal communication. To test this idea, we studied single neurons in macaque monkey intermediate visual (area V4) and somatosensory...

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

authors： Yau JM,Pasupathy A,Fitzgerald PJ,Hsiao SS,Connor CE

更新日期：2009-09-22 00:00:00

abstract：:Fungi produce numerous low molecular weight molecules endowed with a multitude of biological activities. However, mining the full-genome sequences of fungi indicates that their potential to produce secondary metabolites is greatly underestimated. Because most of the biosynthesis gene clusters are silent under laborato...

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

authors： Schroeckh V,Scherlach K,Nützmann HW,Shelest E,Schmidt-Heck W,Schuemann J,Martin K,Hertweck C,Brakhage AA

更新日期：2009-08-25 00:00:00

abstract：:Understanding nuclear receptor signaling in vivo would be facilitated by an efficient methodology to determine where a nuclear receptor is active. Herein, we present a feedback-inducible expression system in transgenic mice to detect activated nuclear receptor effector proteins by using an inducible reporter gene. Wit...

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

authors： Mata De Urquiza A,Solomin L,Perlmann T

更新日期：1999-11-09 00:00:00

abstract：:Iron-sulfur clusters function as cofactors of a wide range of proteins, with diverse molecular roles in both prokaryotic and eukaryotic cells. Dedicated machineries assemble the clusters and deliver them to the final acceptor molecules in a tightly regulated process. In the prototypical Gram-negative bacterium Escheri...

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

authors： Santos JA,Alonso-García N,Macedo-Ribeiro S,Pereira PJ

更新日期：2014-06-03 00:00:00

abstract：:Escherichia coli lipopolysaccharide (LPS)-induced nitrate biosynthesis was studied in LPS-sensitive C3H/He and LPS-resistant C3H/HeJ mice. Intraperitoneal injection of 15 micrograms of LPS led to a temporary 5- to 6-fold increase in blood nitrate concentration in the C3H/He strain. Levels of nitrate excreted in the ur...

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

authors： Stuehr DJ,Marletta MA

更新日期：1985-11-01 00:00:00

abstract：:The techniques of electrophoresis were used in a search for evidence of mutation affecting protein structure, the indicators being hemoglobin and a set of serum proteins and erythrocyte enzymes. Among 94,796 locus tests on Amerindians from Central and South America, there was no evidence for mutation. Among 105,649 lo...

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

authors： Neel JV,Mohrenweiser HW,Meisler MH

更新日期：1980-10-01 00:00:00

abstract：:Better understanding myelination of peripheral nerves would benefit patients affected by peripheral neuropathies, including Charcot-Marie-Tooth disease. Little is known about the role the Golgi compartment plays in Schwann cell (SC) functions. Here, we studied the role of Golgi in myelination of peripheral nerves in m...

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

authors： Baba T,Alvarez-Prats A,Kim YJ,Abebe D,Wilson S,Aldworth Z,Stopfer MA,Heuser J,Balla T

更新日期：2020-11-10 00:00:00

abstract：:Sialic acid-recognizing Ig-like lectins (Siglecs) are signaling receptors that modulate immune responses, and are targeted for interactions by certain pathogens. We describe two primate Siglecs that were rendered nonfunctional by single genetic events during hominin evolution after our common ancestor with the chimpan...

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

authors： Wang X,Mitra N,Secundino I,Banda K,Cruz P,Padler-Karavani V,Verhagen A,Reid C,Lari M,Rizzi E,Balsamo C,Corti G,De Bellis G,Longo L,NISC Comparative Sequencing Program.,Beggs W,Caramelli D,Tishkoff SA,Hayakawa T,Gree

更新日期：2012-06-19 00:00:00

abstract：:The bright ultrafast pulses of X-ray Free-Electron Lasers allow investigation into the structure of matter under extreme conditions. We have used single pulses to ionize and probe water as it undergoes a phase transition from liquid to plasma. We report changes in the structure of liquid water on a femtosecond time sc...

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

authors： Beyerlein KR,Jönsson HO,Alonso-Mori R,Aquila A,Bajt S,Barty A,Bean R,Koglin JE,Messerschmidt M,Ragazzon D,Sokaras D,Williams GJ,Hau-Riege S,Boutet S,Chapman HN,Tîmneanu N,Caleman C

更新日期：2018-05-29 00:00:00

abstract：:The composition, insertion, and turnover of externally disposed proteins on the macrophage plasma membrane were analyzed. Cells labeled with [35S]methionine were incubated with the nonpermeant reagent trinitrobenzene sulfonic acid to introduce the trinitrophenyl moiety on free amino groups of externally oriented membr...

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

authors： Kaplan G,Unkeless JC,Cohn ZA

更新日期：1979-08-01 00:00:00

abstract：:Methods to acutely manipulate protein interactions at the subcellular level are powerful tools in cell biology. Several blue-light-dependent optical dimerization tools have been developed. In these systems one protein component of the dimer (the bait) is directed to a specific subcellular location, while the other com...

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

authors： Benedetti L,Barentine AES,Messa M,Wheeler H,Bewersdorf J,De Camilli P

更新日期：2018-03-06 00:00:00

abstract：:Cell signaling systems sense and respond to ligands that bind cell surface receptors. These systems often respond to changes in the concentration of extracellular ligand more rapidly than the ligand equilibrates with its receptor. We demonstrate, by modeling and experiment, a general "systems level" mechanism cells us...

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

authors： Ventura AC,Bush A,Vasen G,Goldín MA,Burkinshaw B,Bhattacharjee N,Folch A,Brent R,Chernomoretz A,Colman-Lerner A

更新日期：2014-09-16 00:00:00