Control of ovarian cell growth in culture by serum and pituitary factors.

abstract：:The tongue is a critical element of the feeding system in tetrapod animals for their successful adaptation to terrestrial life. Whereas the oral part of the mammalian tongue contains soft tissues only, the avian tongue has an internal skeleton extending to the anterior tip. The mechanisms underlying the evolutionary d...

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

authors： Liu H,Lan Y,Xu J,Chang CF,Brugmann SA,Jiang R

更新日期：2013-11-12 00:00:00

abstract：:Mannan-binding protein (MBP), a Ca2+-dependent mammalian lectin specific for mannose and N-acetylglucosamine, is an important serum component associated with innate immunity. MBP activates complement and functions as a direct opsonin on binding to mannooligosaccharide-bearing pathogens. We have found that MBP recogniz...

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

authors： Ma Y,Uemura K,Oka S,Kozutsumi Y,Kawasaki N,Kawasaki T

更新日期：1999-01-19 00:00:00

abstract：:Animals are typically colonized by diverse bacterial symbionts, many of which are commensal and, in numerous cases, even essential for their host's proper development and growth. In exchange, the host must supply a sufficient array and quantity of nutrients to support the proliferation and persistence of its microbial...

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

authors： Graf J,Ruby EG

更新日期：1998-02-17 00:00:00

abstract：:High-performance anion-exchange (HPAE) chromatography under alkaline conditions (pH congruent to 13) has been found to efficiently separate neutral oligosaccharides (triose to undecaose) according to molecular size, sugar composition, and linkage of monosaccharide units. The method was able to resolve 1----3, 1----4, ...

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

authors： Hardy MR,Townsend RR

更新日期：1988-05-01 00:00:00

abstract：:Locus content maps are derived from monosomic or disomic chromosomes broken by radiation, shearing, or other clastogen, the fragments being distributed among clones by dilution or incorporation into the cells of another species and scored for segregation of markers. Locus content maps provide evidence about radiosensi...

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

authors： Teague JW,Collins A,Morton NE

更新日期：1996-10-15 00:00:00

abstract：:We report the use of engineered ribozymes to shuffle exon cassettes in vitro. Specifically, we have designed derivatives of a group II intron that insert into selected sites in the human tissue plasminogen activator (t-PA) mRNA. The insertion reaction links t-PA sequences to the group II intron sequences so that trans...

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

authors： Mikheeva S,Jarrell KA

更新日期：1996-07-23 00:00:00

abstract：:Ultraviolet (UV)-stimulated nonconservative DNA synthesis has been observed in E. coli rendered permeable to nucleoside triphosphates by exposure to toluene. This synthesis is detected in toluenized cells in which the background of UV-independent DNA synthesis is reduced by use of dnaB mutants temperature-sensitive fo...

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

authors： Masker WE,Hanawalt PC

更新日期：1973-01-01 00:00:00

abstract：:The computation of motion plays a central role in visual orientation. The fly has been successfully used as a model system for analyzing the mechanisms underlying motion detection. Thereby, much attention has been paid to a neuronal circuit of individually identifiable neurons in the third visual ganglion that extract...

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

authors： Borst A,Egelhaaf M

更新日期：1992-05-01 00:00:00

abstract：:It is becoming common practice to partition glass-forming liquids into two classes based on the dependence of the shear viscosity η on temperature T. In an Arrhenius plot, ln η vs 1/T, a strong liquid shows linear behavior whereas a fragile liquid exhibits an upward curvature [super-Arrhenius (SA) behavior], a situati...

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

authors： Mallamace F,Branca C,Corsaro C,Leone N,Spooren J,Chen SH,Stanley HE

更新日期：2010-12-28 00:00:00

abstract：:Tata Element Modulatory Factor (TMF/ARA160) is a multifunctional Golgi-associated protein, which accumulates in colonic enterocytes and goblet cells. Mice lacking TMF/ARA160 (TMF(-/-)) produce thick and uniform colonic mucus that resists adherent bacterial colonization and diminishes susceptibility of these mice to in...

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

authors： Bel S,Elkis Y,Elifantz H,Koren O,Ben-Hamo R,Lerer-Goldshtein T,Rahimi R,Ben Horin S,Nyska A,Shpungin S,Nir U

更新日期：2014-04-01 00:00:00

abstract：:The internal promoter of the Xenopus laevis oocyte-type 5S RNA gene is preferentially cleaved by S1 and Bal-31 nucleases in plasmid DNA. S1 nuclease sensitivity is largely dependent on supercoiling; however, Bal-31 cleaves within the 5S RNA gene in linear as well as in supercoiled DNA. The S1 nuclease-hypersensitive s...

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

authors： Reynolds WF,Gottesfeld JM

更新日期：1985-06-01 00:00:00

abstract：:An effective vaccine that can protect against HIV infection does not exist. A major reason why a vaccine is not available is the high mutability of the virus, which enables it to evolve mutations that can evade human immune responses. This challenge is exacerbated by the ability of the virus to evolve compensatory mut...

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

authors： Murakowski DK,Barton JP,Peter L,Chandrashekar A,Bondzie E,Gao A,Barouch DH,Chakraborty AK

更新日期：2021-02-02 00:00:00

abstract：:Spatial organization of the binding sites for the priming substrate, the template DNA, and the transcription inhibitor rifampicin (Rif) in Escherichia coli RNA polymerase (EC 2.7.7.6) was probed with chimeric compounds in which Rif is covalently attached to a ribonucleotide. The compounds bind to RNA polymerase in bif...

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

authors： Mustaev A,Zaychikov E,Severinov K,Kashlev M,Polyakov A,Nikiforov V,Goldfarb A

更新日期：1994-12-06 00:00:00

abstract：:Herpesviruses must traverse the nuclear envelope to gain access to the cytoplasm and, ultimately, to exit cells. It is believed that herpesvirus nucleocapsids enter the perinuclear space by budding through the inner nuclear membrane (NM). To reach the cytoplasm these enveloped particles must fuse with the outer NM and...

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

authors： Farnsworth A,Wisner TW,Webb M,Roller R,Cohen G,Eisenberg R,Johnson DC

更新日期：2007-06-12 00:00:00

abstract：:Viral shells are self-assembled protein nanocontainers with remarkable material properties. They combine simplicity of construction with toughness and complex functionality. These properties make them interesting for bionanotechnology. To date we know little about how virus structure determines assembly pathways and s...

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

authors： Ivanovska IL,Miranda R,Carrascosa JL,Wuite GJ,Schmidt CF

更新日期：2011-08-02 00:00:00

abstract：:Seven clones encoding interferon response element binding factors have been isolated from a mouse fibroblast lambda gt11 cDNA library by using a 32P end-labeled tandem trimer of the mouse (2'-5')oligoadenylate synthetase gene interferon response element as a probe. Clone 16 shares strong similarity (95%) at both DNA a...

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

authors： Yan C,Tamm I

更新日期：1991-01-01 00:00:00

abstract：:Many current treatments for the reclamation of contaminated water sources are chemical-intensive, energy-intensive, and/or require posttreatment due to unwanted by-product formation. We demonstrate that through the integration of nanostructured materials, enzymatic catalysis, and iron-catalyzed free radical reactions ...

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

authors： Lewis SR,Datta S,Gui M,Coker EL,Huggins FE,Daunert S,Bachas L,Bhattacharyya D

更新日期：2011-05-24 00:00:00

abstract：:A cell of the bacterium Escherichia coli was tethered covalently to a glass coverslip by a single flagellum, and its rotation was stopped by using optical tweezers. The tweezers acted directly on the cell body or indirectly, via a trapped polystyrene bead. The torque generated by the flagellar motor was determined by ...

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

authors： Berry RM,Berg HC

更新日期：1997-12-23 00:00:00

abstract：:Antisense RNA to the 27/32-kDa rat liver gap junction (GJ) protein was used to explore the role of GJs in preimplantation embryos. When all blastomeres of two- and four-cell embryos were injected with GJ antisense RNA, the percentage of embryos compacted at 60 hr of development was reduced to less than 20%, while 90% ...

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

authors： Bevilacqua A,Loch-Caruso R,Erickson RP

更新日期：1989-07-01 00:00:00

abstract：:Using electron microscopy and fitting of crystal structures, we present the 3D reconstruction of ligand-induced dimers of intact receptor tyrosine kinase, KIT. We observe that KIT protomers form close contacts throughout the entire structure of ligand-bound receptor dimers, and that the dimeric receptors adopt multipl...

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

authors： Opatowsky Y,Lax I,Tomé F,Bleichert F,Unger VM,Schlessinger J

更新日期：2014-02-04 00:00:00

abstract：:We recently found that the beta-adrenergic agonist 1-isoproterenol evokes a rapid (less than 5 min) Ca2+- and receptor-dependent stimulation of endocytosis, hexose transport, and amino acid transport in mouse renal cortex involving proximal tubule cells. This response is associated with increased Ca2+ fluxes and a mob...

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

authors： Koenig H,Goldstone AD,Lu CY

更新日期：1983-12-01 00:00:00

abstract：:This study presents, to our knowledge, the first on-line measurement of acetylcholinesterase (AcChoEase) release from brain tissue. It is now well established that a soluble form of the enzyme is released from central nervous system neurons, and it has been proposed on indirect grounds that such release may occur not ...

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

authors： Llinás RR,Greenfield SA

更新日期：1987-05-01 00:00:00

abstract：:We used a sensitive and specific cDNA polymerase chain reaction assay to detect hepatitis C virus (HCV) RNA in serum samples from 128 unselected southern African Blacks with hepatocellular carcinoma (HCC) and found HCV RNA in 26 (20.3%) of these patients. Antibodies to HCV (anti-HCV) were detected in 59 patients (46.1...

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

authors： Bukh J,Miller RH,Kew MC,Purcell RH

更新日期：1993-03-01 00:00:00

abstract：:5-enol-Pyruvylshikimate-3-phosphate synthase (EPSP synthase; phosphoenolpyruvate:3-phosphoshikimate 1-carboxyvinyltransferase, EC 2.5.1.19) is an enzyme on the pathway toward the synthesis of aromatic amino acids in plants, fungi, and bacteria and is the target of the broad-spectrum herbicide glyphosate. The three-dim...

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

authors： Stallings WC,Abdel-Meguid SS,Lim LW,Shieh HS,Dayringer HE,Leimgruber NK,Stegeman RA,Anderson KS,Sikorski JA,Padgette SR,Kishore GM

更新日期：1991-06-01 00:00:00

abstract：:S-nitrosylation, the selective modification of cysteine residues in proteins to form S-nitrosocysteine, is a major emerging mechanism by which nitric oxide acts as a signaling molecule. Even though nitric oxide is intimately involved in the regulation of vascular smooth muscle cell functions, the potential protein tar...

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

authors： Greco TM,Hodara R,Parastatidis I,Heijnen HF,Dennehy MK,Liebler DC,Ischiropoulos H

更新日期：2006-05-09 00:00:00

abstract：:Skin wound infections are a significant health problem, and antibiotic resistance is on the rise. Mast cells (MCs) have been shown to contribute to host-defense responses in certain bacterial infections, but their role in skin wound superinfection is unknown. We subjected 2 MC-deficient mouse strains to Pseudomonas ae...

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

authors： Zimmermann C,Troeltzsch D,Giménez-Rivera VA,Galli SJ,Metz M,Maurer M,Siebenhaar F

更新日期：2019-10-08 00:00:00

abstract：:Telomeric repeat-containing RNA (referred to as TERRA), a noncoding RNA molecule, has recently been found in mammalian cells. The detailed structural features and function of the TERRA RNA at human chromosome ends remain unclear, although this RNA molecule may be a key component of the telomere machinery. In the prese...

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

authors： Xu Y,Suzuki Y,Ito K,Komiyama M

更新日期：2010-08-17 00:00:00

abstract：:Bipedalism is a defining trait of the hominin lineage, associated with a transition from a more arboreal to a more terrestrial environment. While there is debate about when modern human-like bipedalism first appeared in hominins, all known South African hominins show morphological adaptations to bipedalism, suggesting...

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

authors： Georgiou L,Dunmore CJ,Bardo A,Buck LT,Hublin JJ,Pahr DH,Stratford D,Synek A,Kivell TL,Skinner MM

更新日期：2020-04-14 00:00:00

abstract：:Mitochondria are dynamic organelles that play a key role in energy conversion. Optimal mitochondrial function is ensured by a quality-control system tightly coupled to fusion and fission. In this connection, mitofusin 2 (Mfn2) participates in mitochondrial fusion and undergoes repression in muscle from obese or type 2...

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

authors： Sebastián D,Hernández-Alvarez MI,Segalés J,Sorianello E,Muñoz JP,Sala D,Waget A,Liesa M,Paz JC,Gopalacharyulu P,Orešič M,Pich S,Burcelin R,Palacín M,Zorzano A

更新日期：2012-04-03 00:00:00

abstract：:Activation energies for the individual steps of secretory and viral fusion are reported to be large [Oberhauser, A. F., Monck, J. R. & Fernandez, J. M. (1992) Biophys. J. 61, 800-809; Clague, M. J., Schoch, C., Zech, L. & Blumenthal, R. (1990) Biochemistry 29, 1303-1308]. Understanding the cause for these large activa...

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

authors： Lee J,Lentz BR

更新日期：1998-08-04 00:00:00