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Sample records for rhenium 185 target

  1. Rhenium Redefined

    NASA Technical Reports Server (NTRS)

    2001-01-01

    Through a Small Business Innovation Research (SBIR) contract with NASA's Glenn Research Center, Rhenium Alloys, Inc., of Elyria, Ohio, developed a new method for producing rhenium combustion chambers. Using room temperature isostatic pressing, Rhenium Alloys, Inc., compacted rhenium powder to a high density and into the approximated end shape and dimension of the rocket thruster. The item was then subjected to sintering and containerless hot isostatic pressing, increasing the density of the powder metallurgy part. With the new manufacturing process, both production time and costs are reduced while quality is significantly increased. The method enabled the company to deliver two chemical rocket thrusters to Glenn Research Center. The company makes rhenium a practical choice in manufacturing fields, including the aerospace, nuclear, and electronic industries, with upcoming opportunities projected in medical instrumentation.

  2. High Resolution Laser Spectroscopy of Rhenium Carbide

    NASA Astrophysics Data System (ADS)

    Adam, Allan G.; Hall, Ryan M.; Linton, Colan; Tokaryk, Dennis

    2014-06-01

    The first spectroscopic study of rhenium carbide, ReC, has been performed using both low and high resolution techniques to collect rotationally resolved electronic spectra from 420 to 500nm. Laser-induced fluorescence (LIF), and dispersed fluorescence (DF) techniques were employed. ReC was formed in our laser ablation molecular jet apparatus by ablating a rhenium target rod in the presence of 1% methane in helium. The low resolution spectrum identified four bands of an electronic system belonging to ReC, three of which have been studied so far. Extensive hyperfine structure composed of six hyperfine components was observed in the high resolution spectrum, as well as a clear distinction between the 187ReC and 185ReC isotopologues. The data seems consistent with a ^4Π - ^4Σ- transition, as was predicted before experimentation. Dispersed fluorescence spectra allowed us to determine the ground state vibrational frequency (ωe"=994.4 ± 0.3 wn), and to identify a low-lying electronically excited state at Te"=1118.4 ± 0.4 wn with a vibrational frequency of ωe"=984 ± 2 wn. Personal communication, F. Grein, University of New Brunswick

  3. Targeted disruption of p185/Cul7 gene results in abnormal vascular morphogenesis.

    PubMed

    Arai, Takehiro; Kasper, Jocelyn S; Skaar, Jeffrey R; Ali, Syed Hamid; Takahashi, Chiaki; DeCaprio, James A

    2003-08-19

    Cul1, a member of the cullin ubiquitin ligase family, forms a multiprotein complex known as SCF and plays an essential role in numerous cellular and biological activities. A Cul1 homologue, p185 (Cul7), has been isolated as an simian virus 40 large T antigen-binding protein. To understand the physiological role of p185, we generated mice lacking p185. p185-/- embryos are runted and die immediately after birth because of respiratory distress. Dermal and hypodermal hemorrhage is detected in mutant embryos at late gestational stage. p185-/- placentas show defects in the differentiation of the trophoblast lineage with an abnormal vascular structure. We demonstrate that p185 forms an SCF-like complex with Skp1, Rbx1, Fbw6 (Fbx29), and FAP68 (FAP48, glomulin). FAP68 has recently been identified as a gene responsible for familial glomuvenous malformation. These results suggest that p185 forms a multiprotein complex and plays an important role in vascular morphogenesis.

  4. Targeted disruption of p185/Cul7 gene results in abnormal vascular morphogenesis

    PubMed Central

    Arai, Takehiro; Kasper, Jocelyn S.; Skaar, Jeffrey R.; Ali, Syed Hamid; Takahashi, Chiaki; DeCaprio, James A.

    2003-01-01

    Cul1, a member of the cullin ubiquitin ligase family, forms a multiprotein complex known as SCF and plays an essential role in numerous cellular and biological activities. A Cul1 homologue, p185 (Cul7), has been isolated as an simian virus 40 large T antigen-binding protein. To understand the physiological role of p185, we generated mice lacking p185. p185–/– embryos are runted and die immediately after birth because of respiratory distress. Dermal and hypodermal hemorrhage is detected in mutant embryos at late gestational stage. p185–/– placentas show defects in the differentiation of the trophoblast lineage with an abnormal vascular structure. We demonstrate that p185 forms an SCF-like complex with Skp1, Rbx1, Fbw6 (Fbx29), and FAP68 (FAP48, glomulin). FAP68 has recently been identified as a gene responsible for familial glomuvenous malformation. These results suggest that p185 forms a multiprotein complex and plays an important role in vascular morphogenesis. PMID:12904573

  5. Accelerator Production and Separations for High Specific Activity Rhenium-186

    SciTech Connect

    Jurisson, Silvia S.; Wilbur, D. Scott

    2016-04-01

    Tungsten and osmium targets were evaluated for the production of high specific activity rhenium-186. Rhenium-186 has potential applications in radiotherapy for the treatment of a variety of diseases, including targeting with monoclonal antibodies and peptides. Methods were evaluated using tungsten metal, tungsten dioxide, tungsten disulfide and osmium disulfide. Separation of the rhenium-186 produced and recycling of the enriched tungsten-186 and osmium-189 enriched targets were developed.

  6. A phosphorescent rhenium(I) histone deacetylase inhibitor: mitochondrial targeting and paraptosis induction.

    PubMed

    Ye, Rui-Rong; Tan, Cai-Ping; Lin, Yan-Nan; Ji, Liang-Nian; Mao, Zong-Wan

    2015-05-14

    In this report, we designed a histone deacetylase-targeted phosphorescent Re(I) complex ReLMito. Colocalization studies suggested that ReLMito could specially localize to mitochondria. We also demonstrated that ReLMito could induce paraptosis in cancer cells. These features endowed the complex with potential to induce and monitor mitochondrial morphological changes during the paraptosis simultaneously.

  7. RNF185 Is a Novel E3 Ligase of Endoplasmic Reticulum-associated Degradation (ERAD) That Targets Cystic Fibrosis Transmembrane Conductance Regulator (CFTR)*

    PubMed Central

    El Khouri, Elma; Le Pavec, Gwenaëlle; Toledano, Michel B.; Delaunay-Moisan, Agnès

    2013-01-01

    In the endoplasmic reticulum (ER), misfolded or improperly assembled proteins are exported to the cytoplasm and degraded by the ubiquitin-proteasome pathway through a process called ER-associated degradation (ERAD). ER-associated E3 ligases, which coordinate substrate recognition, export, and proteasome targeting, are key components of ERAD. Cystic fibrosis transmembrane conductance regulator (CFTR) is one ERAD substrate targeted to co-translational degradation by the E3 ligase RNF5/RMA1. RNF185 is a RING domain-containing polypeptide homologous to RNF5. We show that RNF185 controls the stability of CFTR and of the CFTRΔF508 mutant in a RING- and proteasome-dependent manner but does not control that of other classical ERAD model substrates. Reciprocally, its silencing stabilizes CFTR proteins. Turnover analyses indicate that, as RNF5, RNF185 targets CFTR to co-translational degradation. Importantly, however, simultaneous depletion of RNF5 and RNF185 profoundly blocks CFTRΔF508 degradation not only during translation but also after synthesis is complete. Our data thus identify RNF185 and RNF5 as a novel E3 ligase module that is central to the control of CFTR degradation. PMID:24019521

  8. Rhenium material properties

    NASA Technical Reports Server (NTRS)

    Biaglow, James A.

    1995-01-01

    Tensile data were obtained from four different types of rhenium at ambient and elevated temperatures. The four types of rhenium included chemical vapor deposition (CVD) and three powder metallurgy (PM) types, i.e., rolled sheet and pressed and sintered bars, with and without hot isostatic pressure (HIP) treatment. Results revealed a wide range of values with ultimate strengths at ambient temperatures varying from 663 MPa for CVD rhenium to 943 MPa for rolled sheet. A similar spread was also obtained for material tested at 1088 K and 1644 K. The wide variance observed with the different materials indicated that the rhenium manufacturing process, material composition and prior handling strongly dictated its properties. In addition to tensile properties, CVD, pressed and sintered material and HIP rhenium successfully completed 100 cycles of low cycle fatigue. Creep data were also obtained showing that CVD and pressed and sintered rhenium could sustain five hours of testing under a tension of 27.5 MPa at 1922 K.

  9. Rhenium material properties

    SciTech Connect

    Biaglow, J.A.

    1995-09-01

    Tensile data were obtained from four different types of rhenium at ambient and elevated temperatures. The four types of rhenium included chemical vapor deposition (CVD) and three powder metallurgy (PM) types, i.e., rolled sheet and pressed and sintered bars, with and without hot isostatic pressure (HIP) treatment. Results revealed a wide range of values with ultimate strengths at ambient temperatures varying from 663 MPa for CVD rhenium to 943 MPa for rolled sheet. A similar spread was also obtained for material tested at 1088 K and 1644 K. The wide variance observed with the different materials indicated that the rhenium manufacturing process, material composition and prior handling strongly dictated its properties. In addition to tensile properties, CVD, pressed and sintered material and HIP rhenium successfully completed 100 cycles of low cycle fatigue. Creep data were also obtained showing that CVD and pressed and sintered rhenium could sustain five hours of testing under a tension of 27.5 MPa at 1922 K.

  10. Rhenium-Foil Witness Cylinders

    NASA Technical Reports Server (NTRS)

    Knight, B. L.

    1992-01-01

    Cylindrical portion of wall of combustion chamber replaced with rhenium foil mounted on holder. Rhenium oxidizes without melting, indicating regions of excess oxidizer in combustion-chamber flow. Rhenium witness foils also useful in detecting excess oxygen and other oxidizers at temperatures between 2,000 and 3,600 degrees F in burner cores of advanced gas-turbine engines.

  11. Manufacturing SP-100 rhenium tubes

    NASA Astrophysics Data System (ADS)

    Sayre, Edwin D.; Ruffo, Thomas J.

    1992-01-01

    A process for producing high quality, thin walled, wrought, rhenium tubing was successfully developed and qualified in the SP-100 fuel fabrication program. Rhenium was selected for the fuel-cladding barrier versus tungsten because of the cold workability and nuclear characteristics of rhenium. Several tube fabricating processes including swaging, drawing, and extruding sintered tube shells and chemical vapor deposition were evaluated before a drawn tube made by forming and electron beam welding rhenium strip was selected as the most cost effective. The process for making the rhenium tubes is discussed in general and the tube, room temperature, tensile properties are compared favorably with the properties reported in the literature.

  12. Multitasking Immune Sp185/333 Protein, rSpTransformer-E1, and Its Recombinant Fragments Undergo Secondary Structural Transformation upon Binding Targets.

    PubMed

    Lun, Cheng Man; Bishop, Barney M; Smith, L Courtney

    2017-04-01

    The purple sea urchin, Strongylocentrotus purpuratus, expresses a diverse immune response protein family called Sp185/333. A recombinant Sp185/333 protein, previously called rSp0032, shows multitasking antipathogen binding ability, suggesting that the protein family mediates a flexible and effective immune response to multiple foreign cells. Bioinformatic analysis predicts that rSp0032 is intrinsically disordered, and its multiple binding characteristic suggests structural flexibility to adopt different conformations depending on the characteristics of the target. To address the flexibility and structural shifting hypothesis, circular dichroism analysis of rSp0032 suggests that it transforms from disordered (random coil) to α helical structure. This structural transformation may be the basis for the strong affinity between rSp0032 and several pathogen-associated molecular patterns. The N-terminal Gly-rich fragment of rSp0032 and the C-terminal His-rich fragment show unique transformations by either intensifying the α helical structure or changing from α helical to β strand depending on the solvents and molecules added to the buffer. Based on these results, we propose a name change from rSp0032 to rSpTransformer-E1 to represent its flexible structural conformations and its E1 element pattern. Given that rSpTransformer-E1 shifts its conformation in the presence of solvents and binding targets and that all Sp185/333 proteins are predicted to be disordered, many or all of these proteins may undergo structural transformation to enable multitasking binding activity toward a wide range of targets. Consequently, we also propose an overarching name change for the entire family from Sp185/333 proteins to SpTransformer proteins.

  13. Rhenium Rocket Manufacturing Technology

    NASA Technical Reports Server (NTRS)

    1997-01-01

    The NASA Lewis Research Center's On-Board Propulsion Branch has a research and technology program to develop high-temperature (2200 C), iridium-coated rhenium rocket chamber materials for radiation-cooled rockets in satellite propulsion systems. Although successful material demonstrations have gained much industry interest, acceptance of the technology has been hindered by a lack of demonstrated joining technologies and a sparse materials property data base. To alleviate these concerns, we fabricated rhenium to C-103 alloy joints by three methods: explosive bonding, diffusion bonding, and brazing. The joints were tested by simulating their incorporation into a structure by welding and by simulating high-temperature operation. Test results show that the shear strength of the joints degrades with welding and elevated temperature operation but that it is adequate for the application. Rhenium is known to form brittle intermetallics with a number of elements, and this phenomena is suspected to cause the strength degradation. Further bonding tests with a tantalum diffusion barrier between the rhenium and C-103 is planned to prevent the formation of brittle intermetallics.

  14. Rhenium and technetium tricarbonyl complexes of 1,4-Substituted pyridyl-1,2,3-triazole bidentate 'click' ligands conjugated to a targeting RGD peptide.

    PubMed

    Connell, Timothy U; Hayne, David J; Ackermann, Uwe; Tochon-Danguy, Henri J; White, Jonathan M; Donnelly, Paul S

    2014-04-01

    New 1,4-substituted pyridyl-1,2,3-triazole ligands with pendent phenyl isothiocyanate functional groups linked to the heterocycle through a short methylene or longer polyethylene glycol spacers were prepared and conjugated to a peptide containing the arginine-glycine-aspartic acid peptide motif. Rhenium and technetium carbonyl complexes, [M(CO)3 L(x) (py)](+) (where M = Re(I) or (99m) Tc(I) ; L(x)  = 1,4-substituted pyridyl-1,2,3-triazole ligands and py = pyridine) were prepared. One rhenium complex has been characterized by X-ray crystallography, and the luminescent properties of [M(CO)3 L(x) (py)](+) are reported.

  15. EBV microRNA BART 18-5p targets MAP3K2 to facilitate persistence in vivo by inhibiting viral replication in B cells

    PubMed Central

    Qiu, Jin; Thorley-Lawson, David A.

    2014-01-01

    EBV is an oncogenic human herpesvirus that has the ability to infect and transform B cells latently in vitro. However, the virus also establishes a lifetime, benign, persistent latent infection in resting memory B cells in vivo, where the virus is quiescent (i.e., expresses none of the known latent proteins). The virus encodes ∼40 micro-RNAs (miRNAs), most of which are transcribed from the BamH1 fragment A rightward transcript (BART) region of the virus. We have shown previously that a subset of these miRNAs is present at high copy numbers in latently infected memory B cells in vivo, suggesting a role in maintaining latency. Here, we describe the role of one of these miRNAs, BART 18-5p. We show that it targets the 3′UTR of the mRNA, encoding the important cellular signaling molecule MAP kinase kinase kinase 2 (MAP3K2), at exactly the same site as the oncogenic cellular miRNA mir–26a-5p. To our knowledge, this is the first report of a virus encoding a miRNA that suppresses a target in the MAP kinase signaling cascade, a central signal transduction pathway that governs a broad spectrum of biological processes. We further show that MAP3K2 is an intermediary in the signaling pathways that initiate lytic viral replication. Thus, 18-5p expression in latently infected B cells has the effect of blocking viral replication. We propose that the role of 18-5p is to maintain latency by reducing the risk of fortuitous reactivation of the virus in latently infected memory B cells. PMID:25012295

  16. Mineral of the month: rhenium

    USGS Publications Warehouse

    Magyar, Michael J.

    2005-01-01

    Rhenium, an exotic, heat-resistant metal, has grown in importance since its discovery nearly 80 years ago. First isolated by a team of German chemists studying a platinum ore, the mineral was named for the Rhine River. From then until the 1960s, only 2 metric tons of rhenium were produced worldwide. In 2004, worldwide production was 40 metric tons.

  17. System-based proteomic and metabonomic analysis of the Df(16)A+/− mouse identifies potential miR-185 targets and molecular pathway alterations

    PubMed Central

    Wesseling, H; Xu, B; Want, E J; Holmes, E; Guest, P C; Karayiorgou, M; Gogos, J A; Bahn, S

    2017-01-01

    Deletions on chromosome 22q11.2 are a strong genetic risk factor for development of schizophrenia and cognitive dysfunction. We employed shotgun liquid chromatography–mass spectrometry (LC-MS) proteomic and metabonomic profiling approaches on prefrontal cortex (PFC) and hippocampal (HPC) tissue from Df(16)A+/− mice, a model of the 22q11.2 deletion syndrome. Proteomic results were compared with previous transcriptomic profiling studies of the same brain regions. The aim was to investigate how the combined effect of the 22q11.2 deletion and the corresponding miRNA dysregulation affects the cell biology at the systems level. The proteomic brain profiling analysis revealed PFC and HPC changes in various molecular pathways associated with chromatin remodelling and RNA transcription, indicative of an epigenetic component of the 22q11.2DS. Further, alterations in glycolysis/gluconeogenesis, mitochondrial function and lipid biosynthesis were identified. Metabonomic profiling substantiated the proteomic findings by identifying changes in 22q11.2 deletion syndrome (22q11.2DS)-related pathways, such as changes in ceramide phosphoethanolamines, sphingomyelin, carnitines, tyrosine derivates and panthothenic acid. The proteomic findings were confirmed using selected reaction monitoring mass spectrometry, validating decreased levels of several proteins encoded on 22q11.2, increased levels of the computationally predicted putative miR-185 targets UDP-N-acetylglucosamine-peptide N-acetylglucosaminyltransferase 110 kDa subunit (OGT1) and kinesin heavy chain isoform 5A and alterations in the non-miR-185 targets serine/threonine-protein phosphatase 2B catalytic subunit gamma isoform, neurofilament light chain and vesicular glutamate transporter 1. Furthermore, alterations in the proteins associated with mammalian target of rapamycin signalling were detected in the PFC and with glutamatergic signalling in the hippocampus. Based on the proteomic and metabonomic findings, we were

  18. Application of Technetium and Rhenium in Nuclear Medicine

    NASA Astrophysics Data System (ADS)

    Alberto, Roger

    2012-06-01

    Technetium and Rhenium are the two lower elements in the manganese triad. Whereas rhenium is known as an important part of high resistance alloys, technetium is mostly known as a cumbersome product of nuclear fission. It is less known that its metastable isotope 99mTc is of utmost importance in nuclear medicine diagnosis. The technical application of elemental rhenium is currently complemented by investigations of its isotope 188Re, which could play a central role in the future for internal, targeted radiotherapy. This article will briefly describe the basic principles behind diagnostic methods with radionuclides for molecular imaging, review the 99mTc-based radiopharmaceuticals currently in clinical routine and focus on the chemical challenges and current developments towards improved, radiolabeled compounds for diagnosis and therapy in nuclear medicine.

  19. Oxide strengthened molybdenum-rhenium alloy

    DOEpatents

    Bianco, Robert; Buckman, Jr., R. William

    2000-01-01

    Provided is a method of making an ODS molybdenum-rhenium alloy which includes the steps of: (a) forming a slurry containing molybdenum oxide and a metal salt dispersed in an aqueous medium, the metal salt being selected from nitrates or acetates of lanthanum, cerium or thorium; (b) heating the slurry in the presence of hydrogen to form a molybdenum powder comprising molybdenum and an oxide of the metal salt; (c) mixing rhenium powder with the molybdenum powder to form a molybdenum-rhenium powder; (d) pressing the molybdenum-rhenium powder to form a molybdenum-rhenium compact; (e) sintering the molybdenum-rhenium compact in hydrogen or under a vacuum to form a molybdenum-rhenium ingot; and (f) compacting the molybdenum-rhenium ingot to reduce the cross-sectional area of the molybdenum-rhenium ingot and form a molybdenum-rhenium alloy containing said metal oxide. The present invention also provides an ODS molybdenum-rhenium alloy made by the method. A preferred Mo--Re-ODS alloy contains 7-14 weight % rhenium and 2-4 volume % lanthanum oxide.

  20. Evaluation of Rhenium Joining Methods

    NASA Technical Reports Server (NTRS)

    Reed, Brian D.; Morren, Sybil H.

    1995-01-01

    Coupons of rhenium-to-Cl03 flat plate joints, formed by explosive and diffusion bonding, were evaluated in a series of shear tests. Shear testing was conducted on as-received, thermally-cycled (100 cycles, from 21 to 1100 C), and thermally-aged (3 and 6 hrs at 1100 C) joint coupons. Shear tests were also conducted on joint coupons with rhenium and/or Cl03 electron beam welded tabs to simulate the joint's incorporation into a structure. Ultimate shear strength was used as a figure of merit to assess the effects of the thermal treatment and the electron beam welding of tabs on the joint coupons. All of the coupons survived thermal testing intact and without any visible degradation. Two different lots of as-received, explosively-bonded joint coupons had ultimate shear strengths of 281 and 310 MPa and 162 and 223 MPa, respectively. As-received, diffusion-bonded coupons had ultimate shear strengths of 199 and 348 MPa. For the most part, the thermally-treated and rhenium weld tab coupons had shear strengths slightly reduced or within the range of the as-received values. Coupons with Cl03 weld tabs experienced a significant reduction in shear strength. The degradation of strength appeared to be the result of a poor heat sink provided during the electron beam welding. The Cl03 base material could not dissipate heat as effectively as rhenium, leading to the formation of a brittle rhenium-niobium intermetallic.

  1. The role of coordination chemistry in the development of copper and rhenium radiopharmaceuticals.

    PubMed

    Donnelly, Paul S

    2011-02-07

    There are several isotopes of copper and rhenium that are of interest in the development of new molecular imaging or radiotherapeutic agents. This perspective article highlights the role of coordination chemistry in the design of copper and rhenium radiopharmaceuticals engineered to selectively target tissue of interest such as cancer cells or pathological features associated with Alzheimer's disease. The coordination chemistry of copper bis(thiosemicarbazone) derivatives and copper macrocyclic complexes is discussed in terms of their potential application as targeted positron emission tomography tracers for non-invasive diagnostic imaging. A range of rhenium complexes with different ligands with rhenium in different oxidation states are introduced and their potential to be translated to new radiotherapeutic agents discussed.

  2. Oxide strengthened molybdenum-rhenium alloy

    SciTech Connect

    Bianco, Robert; Buckman, William R. Jr.

    1998-12-01

    Provided is a method of making an ODS molybdenum-rhenium alloy which includes the steps of: (1) forming a slurry containing molybdenum oxide and a metal salt dispersed in an aqueous medium, the metal salt being selected from nitrates or acetates of lanthanum, cerium or thorium; (2) heating the slurry in the presence of hydrogen to form a molybdenum powder comprising molybdenum and an oxide of the metal salt; (3) mixing rhenium powder with the molybdenum powder to form a molybdenum-rhenium powder; (4) pressing the molybdenum-rhenium powder to form a molybdenum-rhenium compact; (5) sintering the molybdenum-rhenium compact in hydrogen or under a vacuum to form a molybdenum-rhenium ingot; and (6) compacting the molybdenum-rhenium ingot to reduce the cross-sectional area of the molybdenum-rhenium ingot and form a molybdenum-rhenium alloy containing said metal oxide. The present invention also provides an ODS molybdenum-rhenium alloy made by the method.

  3. Improved Rhenium Thrust Chambers

    NASA Technical Reports Server (NTRS)

    O'Dell, John Scott

    2015-01-01

    Radiation-cooled bipropellant thrust chambers are being considered for ascent/ descent engines and reaction control systems on various NASA missions and spacecraft, such as the Mars Sample Return and Orion Multi-Purpose Crew Vehicle (MPCV). Currently, iridium (Ir)-lined rhenium (Re) combustion chambers are the state of the art for in-space engines. NASA's Advanced Materials Bipropellant Rocket (AMBR) engine, a 150-lbf Ir-Re chamber produced by Plasma Processes and Aerojet Rocketdyne, recently set a hydrazine specific impulse record of 333.5 seconds. To withstand the high loads during terrestrial launch, Re chambers with improved mechanical properties are needed. Recent electrochemical forming (EL-Form"TM") results have shown considerable promise for improving Re's mechanical properties by producing a multilayered deposit composed of a tailored microstructure (i.e., Engineered Re). The Engineered Re processing techniques were optimized, and detailed characterization and mechanical properties tests were performed. The most promising techniques were selected and used to produce an Engineered Re AMBR-sized combustion chamber for testing at Aerojet Rocketdyne.

  4. A different 'spin' on rhenium chemistry. synthetic approaches and perspectives of 17-electron rhenium complexes.

    PubMed

    Zobi, Fabio

    2010-01-01

    Transition metal complexes of rhenium and technetium find wide application in nuclear medicine and the chemistry of these elements is still the focus of intense research efforts. For therapeutic and diagnostic applications, currently much attention is dedicated to the development of new targeting strategies aimed at appending the metal complexes to biological vectors (e.g. a peptide) for a site-specific delivery of the radionuclides. Advancements in radiopharmacy, however, will not only arise from the development of new targeted strategies but also from the exploration of the chemistry of these elements in their unusual oxidation states. In this respect the even number oxidation states of Re and Tc (i.e. +II, +IV and +VI) are relatively poorly understood. In particular, stable and substitutionally labile mononuclear 17-electron species of the elements (+II, d(5)) are a rarely encountered class of complexes. In this review we present our recent developments in the field of rhenium (II) chemistry with emphasis on the novel synthetic strategies we have recently introduced. We will also describe how the unique chemical and electronic properties of Re(II)-based complexes may provide a potentially new approach for applications in inorganic medicinal chemistry.

  5. Directed light fabrication of rhenium components

    SciTech Connect

    Milewski, J.O.; Thoma, D.J.; Lewis, G.K.

    1997-02-01

    Directed Light Fabrication (DLF) is a direct metal deposition process that fuses powder, delivered by gas into the focal zone of a high powered laser beam to form fully dense near-net shaped components. This is accomplished in one step without the use of molds, dies, forming, pressing, sintering or forging equipment. DLF is performed in a high purity inert environment free from the contaminants associated with conventional processing such as oxide and carbon pickup, lubricants, binding agents, cooling or cleaning agents. Applications using rhenium have historically been limited in part by its workability and cost. This study demonstrates the ability to fuse rhenium metal powder, using a DLF machine, into free standing rods and describes the associated parameter study. Microstructural comparisons between DLF deposited rhenium and commercial rhenium sheet product is performed. This research combined with existing DLF technology demonstrates the feasibility of forming complex rhenium, metal shapes directly from powder.

  6. Structure of rhenium-containing sodium borosilicate glass

    SciTech Connect

    Goel, Ashutosh; McCloy, John S.; Windisch, Charles F.; Riley, Brian J.; Schweiger, Michael J.; Rodriguez, Carmen P.; Ferreira, Jose M.

    2013-03-01

    A series of sodium borosilicate glasses were synthesized with increasing fractions of KReO4 or Re2O7, to 10000 ppm (1 mass%) target Re in glass, to assess the effects of large concentrations of rhenium on glass structure and to estimate the solubility of technetium, a radioactive component in typical low active waste nuclear waste glasses. Magic angle spinning nuclear magnetic resonance (MAS-NMR), Fourier transform infrared (FTIR) spectroscopy, and Raman spectroscopy were performed to characterize the glasses as a function of Re source additions. In general, silicon was found coordinated in a mixture of Q2 and Q3 structural units, while Al was 4-coordinated and B was largely 3-coordinate and partially 4-coordinated. The rhenium source did not appear to have significant effects on the glass structure. Thus, at the up to the concentrations that remain in dissolved in glass, ~3000 ppm Re by mass maximum. , the Re appeared to be neither a glass-former nor a strong glass modifier., Rhenium likely exists in isolated ReO4- anions in the interstices of the glass network, as evidenced by the polarized Raman spectrum of the Re glass in the absence of sulfate. Analogous to SO42-¬ in similar glasses, ReO4- is likely a network modifier and forms alkali salt phases on the surface and in the bulk glass above solubility.

  7. Properties of tungsten-rhenium and tungsten-rhenium with hafnium carbide

    NASA Astrophysics Data System (ADS)

    Leonhardt, Todd

    2009-07-01

    Historically, tungsten-25wt.% rhenium alloy has been manufactured into wire for the thermocouple market, but recent demands for high-temperature structural components have forced the development of novel processing techniques for tungsten-rhenium and tungsten-rhenium with hafnium carbide. With a melting temperature of 3,050°C, and a recrystallization temperature near 1,900°C, tungsten-rhenium alloys are being used in aerospace, temperature measuring, and friction stir welding applications. The mechanical properties and microstructures of tungsten-25wt.% rhenium and tungsten-25wt.% rhenium with hafnium carbide are reported at ambient temperature, 1,371°C, and 1,926°C, after processing by three methods: hot isostatic pressing, swaging, and extrusion.

  8. Catalytic reforming with rhenium-platinum catalyst containing more rhenium than platinum

    SciTech Connect

    Gallagher, J.P.; Yarrington, R.M.

    1982-10-26

    A new reforming process employs a new rhenium-platinum catalytic composite having a rhenium to platinum weight ratio in the range of not less than 2 to about 5, whereby longer relative cycle length is obtained when reforming a naphtha having less than about 0.5 ppm by weight of sulfur than if the rhenium-platinum ratio is outside of such range.

  9. Rhenium/Oxygen Interactions at Elevated Temperatures

    NASA Technical Reports Server (NTRS)

    Jacobson, Nathan; Myers, Dwight; Zhu, Dong-Ming; Humphrey, Donald

    2000-01-01

    The oxidation of pure rhenium is examined from 600-1400 C in oxygen/argon mixtures. Linear weight loss kinetics are observed. Gas pressures, flow rates, and temperatures are methodically varied to determine the rate controlling steps. The reaction at 600 and 800 C appears to be controlled by a chemical reaction step at the surface; whereas the higher temperature reactions appear to be controlled by gas phase diffusion of oxygen to the rhenium surface. Attack of the rhenium appears to be along grain boundaries and crystallographic planes.

  10. Rhenium alloying of tungsten heavy alloys

    SciTech Connect

    German, R.M.; Bose, A.; Jerman, G.

    1989-01-01

    Alloying experiments were performed using rhenium additions to a classic 90 mass % tungsten heavy alloy. The mixed-powder system was liquid phase sintered to full density at 1500 C in 60 min The rhenium-modified alloys exhibited a smaller grain size, higher hardness, higher strength, and lower ductility than the unalloyed system. For an alloy with a composition of 84W-6Re-8Ni-2Fe, the sintered density was 17, 4 Mg/m{sup 3} with a yield strength of 815 MPa, tensile strength of 1180 MPa, and elongation to failure of 13%. This property combination results from the aggregate effects of grain size reduction and solid solution hardening due to rhenium. In the unalloyed system these properties require post-sintering swaging and aging; thus, alloying with rhenium is most attractive for applications where net shaping is desired, such as by powder injection molding.

  11. Mineral resource of the month: rhenium

    USGS Publications Warehouse

    Polyak, Désirée E.

    2012-01-01

    Rhenium, a silvery-white, heat resistant metal, has increased significantly in importance since its discovery in 1925. First isolated by a team of German chemists studying platinum ore, the mineral was named for the Rhine River. From 1925 until the 1960s, only two metric tons of rhenium were produced worldwide. Since then, its uses have steadily increased, including everything from unleaded gasoline to jet engines, and worldwide annual production now tops 45 metric tons.

  12. Rhenium-Oxygen Interactions at High Temperatures

    NASA Technical Reports Server (NTRS)

    Jacobson, Nathan S.; Myers, Dwight L.; Zhu, Dongming; Humphrey, Donald

    2000-01-01

    The reaction of pure rhenium metal with dilute oxygen/argon mixtures was studied from 600 to 1400 C. Temperature, oxygen pressure, and flow rates were systematically varied to determine the rate-controlling steps. At lower temperatures the oxygen/rhenium chemical reaction is rate limiting; at higher temperatures gas-phase diffusion of oxygen through the static boundary layer is rate limiting. At all temperatures post-reaction microstructures indicate preferential attack along certain crystallographic planes and defects.

  13. Bulk production and evaluation of high specific activity 186g Re for cancer therapy using enriched 186 WO 3 targets in a proton beam

    DOE PAGES

    Mastren, Tara; Radchenko, Valery; Bach, Hong T.; ...

    2017-06-01

    Rhenium-186 g (t1/2 = 3.72 d) is a β– emitting isotope suitable for theranostic applications. Current production methods rely on reactor production by way of the reaction 185Re(n,γ)186gRe, which results in low specific activities limiting its use for cancer therapy. Production via charged particle activation of enriched 186W results in a 186gRe product with a much specific activity, allowing it to be used more broadly for targeted radiotherapy applications. Furthermore, this targets the unmet clinical need for more efficient radiotherapeutics.

  14. Bulk production and evaluation of high specific activity 186gRe for cancer therapy using enriched 186WO3 targets in a proton beam

    DOE PAGES

    Mastren, Tara; Radchenko, Valery; Bach, Hong Thu; ...

    2017-03-03

    Rhenium-186 g (t1/2 = 3.72 d) is a β– emitting isotope suitable for theranostic applications. Current production methods rely on reactor production by way of the reaction 185Re(n,γ)186gRe, which results in low specific activities limiting its use for cancer therapy. Production via charged particle activation of enriched 186W results in a 186gRe product with a much specific activity, allowing it to be used more broadly for targeted radiotherapy applications. Furthermore, this targets the unmet clinical need for more efficient radiotherapeutics.

  15. Recovery of rhenium from sulfuric acid solutions with activated coals

    SciTech Connect

    Troshkina, I.D.; Naing, K.Z.; Ushanova, O.N.; P'o, V.; Abdusalomov, A.A.

    2006-09-15

    Equilibrium and kinetic characteristics of rhenium sorption from sulfuric acid solutions (pH 2) by activated coals produced from coal raw materials (China) were studied. Constants of the Henry equation describing isotherms of rhenium sorption by activated coals were calculated. The effective diffusion coefficients of rhenium in the coals were determined. The dynamic characteristics of rhenium sorption and desorption were determined for the activated coal with the best capacity and kinetic characteristics.

  16. Stereoisomeric complexes of technetium and rhenium with penicillamine

    SciTech Connect

    Johnson, D.L.; Fritzberg, A.R.; Eshima, D.; Kasina, S.; Bloedow, D.C.

    1984-01-01

    Very few direct comparisons exist between the coordination chemistry of technetium and rhenium. Such comparisons are useful in the synthesis and characterization of new Tc-99m radiopharmaceuticals and will likely be important in the development of radiotherapy agents based on Re-186 or -188. The authors report chemical studies on three stereoisomeric Tc-99 penicillamine complexes and their Re congeners as well as biological studies on the Tc-99m complexes. When Tc0/sub 4/-bar was reduced by SnCl/sub 2/ at pH 5.5 in the presence of D-penicillamine, a complex identical to the one characterized by a previous study as (D-pen)/sub 2/Tc0/sup -/ was formed. The same reaction using L-penacillamine gave the chromatographically identical enantiomer of the complex. When D,L-penicillamine was used, a second HPLC separable complex was formed in addition to the above mentioned enantiomers. Fast atom bombardment mass spectra showed the complexes to be isomeric. A proton NMR study of this second complex has shown it to be two enantiomeric forms of (D-pen)(L-pen)Tc0/sup -/ that interconvert rapidly in aqueous solution. The corresponding rhenium complexes were prepared by reduction of RE0/sub 4/-bar in 1 N HCl and were similarly characterized. The fluxional Tc complex racemizes with k/sub 1/=830 sec/sup -1/ at 25/sup 0//C and E/sub a/=13 kcal/mole while the Re complex racemizes much more slowly with k/sub 1/=285 sec/sup -1/ at 55/sup 0/ and E/sub a/=18.5 kcal/mole, consistent with the trend that second row transition metals undergo similar reactions at faster rates than their third row counterparts. Studies of the renal and hepatobiliary excretion of the Tc-99m complexes showed significant differences.

  17. Determining rhenium in weak processing solutions

    SciTech Connect

    Koval', L.B.

    1986-09-01

    Analytical methods of determining rhenium in production solutions and solid materials almost always include a stage of separating molybdenum, since these elements occur together in molybdenum ores and concentrates. The authors have developed a method of analysis for rhenium in low-concentration industrial solutions containing a complicated set of impurities. The molybdenum is separated from rhenium in a separating funnel and the acidity is brought to 1 M. A 20% solution of KCNS is added together with ascorbic acid. The funnel is shaken for 1-2 min and left to stand until the molybdenum is completely reduced (5-10 min), and then the thiocyanate complex of the molybdenum is extracted with diethyl ether. The lower water layer is transferred to a volumetric flask and the necessary reagents are added to reduce the rhenium and produce the yellow-orange rhenium thiocyanate complex. The peak optical density of the complex is measured with a photocolorimeter and the absorption spectra are recorded with a spectrophotometer.

  18. Liquid fluorine/hydrazine rhenium thruster update

    NASA Technical Reports Server (NTRS)

    Appel, M. A.; Kaplan, R. B.; Tuffias, R. H.

    1983-01-01

    The status of a fluorine/hydrazine thruster development program is discussed. A solid rhenium metal sea-level thrust chamber was successfully fabricated and tested for a total run duration of 1075 s with 17 starts. Rhenium fabrication methods are discussed. A test program was conducted to evaluate performance and chamber cooling. Acceptable performance was reached and cooling was adequate. A flight-type injector was fabricated that achieved an average extrapolated performance value of 3608 N-s/kg (368 lbf-s/lbm). Altitude thrust chambers were fabricated. One chamber incorporates a rhenium combustor and nozzle with an area ratio of 15:1, and a columbium nozzle extension with area ratios from 15:1 to 60:1. The other chamber was fabricated completely with a carbon/carbon composite. Because of the attributes of rhenium for use in high-temperature applications, a program to provide the materials and processes technology needed to reliably fabricate and/or repair vapor-deposited rhenium parts of relatively large size and complex shape is recommended.

  19. Size and shape of rhenium nanoparticles.

    SciTech Connect

    Yang, N.; Mickelson, G. E.; Greenlay, N.; Kelly, S. D.; Vila, F. D.; Kas, J.; Rehr, J. J.; Bare, S. R.; X-Ray Science Division; UOP LLC; EXAFS; Univ. of Washington

    2007-01-01

    In this paper the results from a detailed XAFS characterization of supported rhenium nanoparticles are presented. The Re nanoparticles are formed by the reduction of dispersed supported rhenium oxide in the presence of moist hydrogen. The shape of the wet-reduced Re clusters is determined by comparing the EXAFS spectra of Re-metal to the Re-wet-reduced clusters to 6 {angstrom}. A decrease in the signal from the 4th and 7th Re shells is an indication of sheet-like rather than spherical-like particles.

  20. Characterization of Rhenium Oxides Using ESCA

    NASA Technical Reports Server (NTRS)

    Panda, Binayak; Jones, Clyde S. (Technical Monitor)

    2001-01-01

    Rhenium as an engineering material has the following properties: (1) high melting point (one of the refractory metals); (2) high strength at elevated temperatures; (3) excellent toughness at room temperature; (4) low vapor pressure at melting point; (5) low coefficient of thermal expansion; (6) high impact and wear resistance; (7) compatibility with elements such as carbon and platinum; (8) conservation of properties in the presence of hydrogen, water vapor, and nitrogen oxides; and (9) poor oxidation resistance. This viewgraph presentation gives an overview of rhenium oxide characterization, including details on its history, experimental procedure using ESCA, and the analysis of the oxides (spectra and effects of ion sputtering).

  1. Rhenium solubility in borosilicate nuclear waste glass: implications for the processing and immobilization of technetium-99.

    PubMed

    McCloy, John S; Riley, Brian J; Goel, Ashutosh; Liezers, Martin; Schweiger, Michael J; Rodriguez, Carmen P; Hrma, Pavel; Kim, Dong-Sang; Lukens, Wayne W; Kruger, Albert A

    2012-11-20

    The immobilization of technetium-99 ((99)Tc) in a suitable host matrix has proven to be a challenging task for researchers in the nuclear waste community around the world. In this context, the present work reports on the solubility and retention of rhenium, a nonradioactive surrogate for (99)Tc, in a sodium borosilicate glass. Glasses containing target Re concentrations from 0 to 10,000 ppm [by mass, added as KReO(4) (Re(7+))] were synthesized in vacuum-sealed quartz ampules to minimize the loss of Re from volatilization during melting at 1000 °C. The rhenium was found as Re(7+) in all of the glasses as observed by X-ray absorption near-edge structure. The solubility of Re in borosilicate glasses was determined to be ~3000 ppm (by mass) using inductively coupled plasma optical emission spectroscopy. At higher rhenium concentrations, additional rhenium was retained in the glasses as crystalline inclusions of alkali perrhenates detected with X-ray diffraction. Since (99)Tc concentrations in a glass waste form are predicted to be <10 ppm (by mass), these Re results implied that the solubility should not be a limiting factor in processing radioactive wastes, assuming Tc as Tc(7+) and similarities between Re(7+) and Tc(7+) behavior in this glass system.

  2. Iridium-Coated Rhenium Combustion Chamber

    NASA Technical Reports Server (NTRS)

    Schneider, Steven J.; Tuffias, Robert H.; Rosenberg, Sanders D.

    1994-01-01

    Iridium-coated rhenium combustion chamber withstands operating temperatures up to 2,200 degrees C. Chamber designed to replace older silicide-coated combustion chamber in small rocket engine. Modified versions of newer chamber could be designed for use on Earth in gas turbines, ramjets, and scramjets.

  3. Elastic module of superhard rhenium diboride

    SciTech Connect

    Koehler, Michael R.; Keppens, Veerle; Sales, Brian C; Jin, Rongying; Mandrus, David

    2009-01-01

    The elastic moduli of polycrystalline rhenium diboride are measured as a function of temperature between 5 and 325 K. The room temperature results show that ReB{sub 2} has very high values for both the bulk and shear modulus, confirming the incompressible and superhard nature of this material. With decreasing temperature, the moduli increase, with a hint of softening below 50 K.

  4. ITEP MEVVA ion beam for rhenium silicide production

    SciTech Connect

    Kulevoy, T.; Seleznev, D.; Kropachev, G.; Kozlov, A.; Kuibeda, R.; Yakushin, P.; Petrenko, S.; Gerasimenko, N.; Medetov, N.; Zaporozhan, O.

    2010-02-15

    The rhenium silicides are very attractive materials for semiconductor industry. In the Institute for Theoretical and Experimental Physics (ITEP) at the ion source test bench the research program of rhenium silicide production by ion beam implantation are going on. The investigation of silicon wafer after implantation of rhenium ion beam with different energy and with different total dose were carried out by secondary ions mass spectrometry, energy-dispersive x-ray microanalysis, and x-ray diffraction analysis. The first promising results of rhenium silicide film production by high intensity ion beam implantation are presented.

  5. 32 CFR 185.6 - Information requirements.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ... 32 National Defense 1 2010-07-01 2010-07-01 false Information requirements. 185.6 Section 185.6 National Defense Department of Defense OFFICE OF THE SECRETARY OF DEFENSE CIVIL DEFENSE MILITARY SUPPORT TO CIVIL AUTHORITIES (MSCA) § 185.6 Information requirements. The reporting requirements in § 185.5...

  6. 46 CFR 185.420 - Crew training.

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    ... 46 Shipping 7 2010-10-01 2010-10-01 false Crew training. 185.420 Section 185.420 Shipping COAST...) OPERATIONS Crew Requirements § 185.420 Crew training. (a) The owner, charterer, master or managing operator... duties listed in the station bill required by § 185.514 of this part. (b) Training conducted on a...

  7. Iridium-coated rhenium thrusters by CVD

    NASA Technical Reports Server (NTRS)

    Harding, John T.; Kazaroff, John M.; Appel, Marshall A.

    1988-01-01

    Operation of spacecraft thrusters at increased temperature reduces propellant requirements. Inasmuch as propellant comprises the bulk of a satellite's mass, even a small percentage reduction makes possible a significant enhancement of the mission in terms of increased payload. Because of its excellent high temperature strength, rhenium is often the structural material of choice. It can be fabricated into free-standing shapes by chemical vapor deposition (CVD) onto an expendable mandrel. What rhenium lacks is oxidation resistance, but this can be provided by a coating of iridium, also by CVD. This paper describes the process used by Ultramet to fabricate 22-N (5-lbf) and, more recently, 445-N (100-lbf) Ir/Re thrusters; characterizes the CVD-deposited materials; and summarizes the materials effects of firing these thrusters. Optimal propellant mixture ratios can be employed because the materials withstand an oxidizing environment up to the meltimg temperature of iridium, 2400 C (4350 F).

  8. Iridium-coated rhenium thrusters by CVD

    NASA Technical Reports Server (NTRS)

    Harding, J. T.; Kazaroff, J. M.; Appel, M. A.

    1989-01-01

    Operation of spacecraft thrusters at increased temperature reduces propellant requirements. Inasmuch as propellant comprises the bulk of a satellite's mass, even a small percentage reduction makes possible a significant enhancement of the mission in terms of increased payload. Because of its excellent high temperature strength, rhenium is often the structural material of choice. It can be fabricated into free-standing shapes by chemical vapor deposition (CVD) onto an expendable mandrel. What rhenium lacks is oxidation resistance, but this can be provided by a coating of iridium, also by CVD. This paper describes the process used by Ultramet to fabricate 22-N (5-lbf) and, more recently, 445-N (100-lbf) Ir/Re thrusters; characterizes the CVD-deposited materials; and summarizes the materials effects of firing these thrusters. Optimal propellant mixture ratios can be employed because the materials withstand an oxidizing environment up to the melting temperature of iridium, 2400 C (4350 F).

  9. Rhenium ion beam for implantation into semiconductors

    SciTech Connect

    Kulevoy, T. V.; Seleznev, D. N.; Alyoshin, M. E.; Kraevsky, S. V.; Yakushin, P. E.; Khoroshilov, V. V.; Gerasimenko, N. N.; Smirnov, D. I.; Fedorov, P. A.; Temirov, A. A.

    2012-02-15

    At the ion source test bench in Institute for Theoretical and Experimental Physics the program of ion source development for semiconductor industry is in progress. In framework of the program the Metal Vapor Vacuum Arc ion source for germanium and rhenium ion beam generation was developed and investigated. It was shown that at special conditions of ion beam implantation it is possible to fabricate not only homogenous layers of rhenium silicides solid solutions but also clusters of this compound with properties of quantum dots. At the present moment the compound is very interesting for semiconductor industry, especially for nanoelectronics and nanophotonics, but there is no very developed technology for production of nanostructures (for example quantum sized structures) with required parameters. The results of materials synthesis and exploration are presented.

  10. Rhenium Mechanical Properties and Joining Technology

    NASA Technical Reports Server (NTRS)

    Reed, Brian D.; Biaglow, James A.

    1996-01-01

    Iridium-coated rhenium (Ir/Re) provides thermal margin for high performance and long life radiation cooled rockets. Two issues that have arisen in the development of flight Ir/Re engines are the sparsity of rhenium (Re) mechanical property data (particularly at high temperatures) required for engineering design, and the inability to directly electron beam weld Re chambers to C103 nozzle skirts. To address these issues, a Re mechanical property database is being established and techniques for creating Re/C103 transition joints are being investigated. This paper discusses the tensile testing results of powder metallurgy Re samples at temperatures from 1370 to 2090 C. Also discussed is the evaluation of Re/C103 transition pieces joined by both, explosive and diffusion bonding. Finally, the evaluation of full size Re transition pieces, joined by inertia welding, as well as explosive and diffusion bonding, is detailed.

  11. Characterization of Rhenium Oxides Using ESCA

    NASA Technical Reports Server (NTRS)

    Panda, Binayak; Gentz, Steven J. (Technical Monitor)

    2001-01-01

    High melting point and inherent ductility (toughness) over a wide range of temperature has made Rhenium an engineering material of choice for several thrust chambers in propulsion systems. Although the material remains tough at high temperatures, it still can readily transform to several oxides. As many as eight different oxides have been reported in literature. When characterized using ESCA (Electron Spectroscopy for Chemical Analyses) these oxides show large shifts in the Re 4f line positions. While this unique property could be used as a tool for oxide characterization, literature indicates that only a few of these oxides have been characterized. Current work focuses on characterizing oxides of Rhenium using ESCA. Spectral line Re 4f have been measured for various oxides and the results have been compared with the Re 4f line positions of real-time oxidation products from space hardware.

  12. Unusual Metalloporphyrin Complexes of Rhenium and Technetium

    DTIC Science & Technology

    1975-06-06

    homodinuclear porphyrins are centrosymmetric complexes having two metals bonded to the porphyrin, one above and one below the plane of the macrocycle while the...may be said about tnt structural details of the porphyrin macrocycle . S1U 6 Resu’i ts: Unusual Rhenium Metalloporphyrin Complexes Reflux of decalin...purphyrin, one above and one below the plane of the macrocyclic ligand. A comparison of these two complexes of Group Vllb congeners is of interest. The X-ray

  13. Rhenium Radioisotopes for Therapeutic Radiopharmaceutical Development

    SciTech Connect

    Beets, A.L.; Knapp, F.F., Jr.; Kropp, J.; Lin, W.-Y.; Pinkert, J.; Wang, S.-Y.

    1999-01-18

    The availability of therapeutic radioisotopes at reasonable costs is important for applications in nuclear medicine, oncology and interventional cardiology, Rhenium-186 (Re-186) and rhenium-1 88 (Re-188) are two reactor-produced radioisotope which are attractive for a variety of therapeutic applications, Rhenium-186 has a half-life of 90 hours and decays with emission of a &particle with a maximum energy of 1.08 MeV and a 135 keV (9Yo) gamma which permits imaging. In contrast, Re- 188 has a much shorter half-life of 16.9 hours and emits a p-particle with a much higher energy of 2.12 MeV (Em=) and a 155 keV gamma photon (15Yo) for imaging. While Re-186 is unavailable from a generator system and must be directly produced in a nuclear reactor, Re-188 can also be directly produced in a reactor with high specific activity, but is more conveniently and cost-effectively available as carrier-free sodium perrhenate by saline elution of the alumina-based tungsten-188 (W1 88)/Re-l 88 generator system [1-2]. Since a comprehensive overviewofRe-186 and Re-188 therapeutic agents is beyond the scope of this &tended Abstrac4 the goal is to provide key examples of various agents currently in clinical use and those which are being developed for important clinical applications.

  14. Soluble irradiation targets and methods for the production of radiorhenium

    SciTech Connect

    Vanderhevden, J.L.E.; Su, F.M.; Ehrhardt, G.J.

    1992-09-08

    This patent describes a method of producing a rhenium-188 radionuclide generator. It comprises irradiating a water soluble irradiation target selected from the group consisting of sodium tungstate and lithium tungstate, reacting the irradiated target with an aqueous zirconium solution to obtain an insoluble zirconium tungstate gel, and disposing the zirconium tungstate in an elutable container to obtain the rhenium-188 radionuclide generator.

  15. Cellular uptake and cytotoxicity of octahedral rhenium cluster complexes.

    PubMed

    Choi, Soo-Jin; Brylev, Konstantin A; Xu, Jing-Zhe; Mironov, Yuri V; Fedorov, Vladimir E; Sohn, Youn Soo; Kim, Sung-Jin; Choy, Jin-Ho

    2008-11-01

    Cellular uptake behavior of a novel class of octahedral rhenium cluster compounds, hexahydroxo complexes K(4)[{Re(6)S(8)}(OH)(6)].8H(2)O (1) and K(4)[{Re(6)Se(8)}(OH)(6)].8H(2)O (2), was evaluated in human cervical adenocarcinoma HeLa cells. Confocal microscopy and flow cytometry studies demonstrated that rhenium cluster 1 was not internalized into cell, while rhenium cluster 2 was. Conjugation of a polymer to rhenium cluster 1, namely the derivative K(4)[{Re(6)S(8)}(OH)(5)L] (3) (L is amphiphilic diblock copolymer MPEG550-CH(2)CONH-GlyPheLeuGlyPheLeu-COO(-)), considerably enhanced cellular uptake in a concentration-dependent manner and was predominantly localized in the cytoplasm and nucleus upon incubation time. The uptake of rhenium cluster 2 was mediated by energy-dependent endocytosis, whereas rhenium cluster 3 was directly ingested into cells by cell-fusion-like mechanism. According to the cytotoxicity evaluation test, both rhenium clusters 2 and 3 did not exhibit acute cytotoxic effects up to 50 microM, at the practical concentration level of biological applications. It is, therefore, expected that the rhenium cluster complexes can be promising potential candidates as diagnostic agents for medical treatment.

  16. Rhenium: a rare metal critical in modern transportation

    USGS Publications Warehouse

    John, David A.

    2015-01-01

    Rhenium rarely occurs as a native element or as its own sulfide mineral—rheniite (ReS2)—and often occurs as a substitute for molybdenum in molybdenite (MoS2). Most extracted rhenium is a byproduct of copper mining, with about 80 percent recovered from flue dust during the processing of molybdenite concentrates from porphyry copper deposits.

  17. Near-Net Shape Powder Metallurgy Rhenium Thruster

    NASA Technical Reports Server (NTRS)

    Leonhardt, Todd; Hamister, Mark; Carlen, Jan C.; Biaglow, James; Reed, Brian

    2001-01-01

    This paper describes the development of a method to produce a near-net shape (NNS) powder metallurgy (PM) rhenium combustion chamber of the size 445 N (100 lbf) used in a high performance liquid apogee engine. These engines are used in low earth Orbit and geostationary orbit for satellite positioning systems. The developments in near-net shape powder metallurgy rhenium combustion chambers reported in this paper will reduce manufacturing cost of the rhenium chambers by 25 percent, and reduce the manufacturing time by 30 to 40 percent. The quantity of rhenium metal powder used to produce a rhenium chamber is reduced by approximately 70 percent and the subsequent reduction in machining schedule and costs is nearly 50 percent.

  18. Natural variations in the rhenium isotopic composition of meteorites

    NASA Astrophysics Data System (ADS)

    Liu, R.; Hu, L.; Humayun, M.

    2017-03-01

    Rhenium is an important element with which to test hypotheses of isotope variation. Historically, it has been difficult to precisely correct the instrumental mass bias in thermal ionization mass spectrometry. We used W as an internal standard to correct mass bias on the MC-ICP-MS, and obtained the first precise δ187Re values ( ±0.02‰, 2SE) for iron meteorites and chondritic metal. Relative to metal from H chondrites, IVB irons are systematically higher in δ187Re by 0.14 ‰. δ187Re for other irons are similar to H chondritic metal, although some individual samples show significant isotope fractionation. Since 185Re has a high neutron capture cross section, the effect of galactic cosmic-ray (GCR) irradiation on δ187Re was examined using correlations with Pt isotopes. The pre-GCR irradiation δ187Re for IVB irons is lower, but the difference in δ187Re between IVB irons and other meteoritic metal remains. Nuclear volume-dependent fractionation for Re is about the right magnitude near the melting point of iron, but because of the refractory and compatible character of Re, a compelling explanation in terms of mass-dependent fractionation is elusive. The magnitude of a nucleosynthetic s-process deficit for Re estimated from Mo and Ru isotopes is essentially unresolvable. Since thermal processing reduced nucleosynthetic effects in Pd, it is conceivable that Re isotopic variations larger than those in Mo and Ru may be present in IVBs since Re is more refractory than Mo and Ru. Thus, the Re isotopic difference between IVBs and other irons or chondritic metal remains unexplained.

  19. Iridium/Rhenium Parts For Rocket Engines

    NASA Technical Reports Server (NTRS)

    Schneider, Steven J.; Harding, John T.; Wooten, John R.

    1991-01-01

    Oxidation/corrosion of metals at high temperatures primary life-limiting mechanism of parts in rocket engines. Combination of metals greatly increases operating temperature and longevity of these parts. Consists of two transition-element metals - iridium and rhenium - that melt at extremely high temperatures. Maximum operating temperature increased to 2,200 degrees C from 1,400 degrees C. Increases operating lifetimes of small rocket engines by more than factor of 10. Possible to make hotter-operating, longer-lasting components for turbines and other heat engines.

  20. 5 CFR 185.102 - Definitions.

    Code of Federal Regulations, 2010 CFR

    2010-01-01

    ... 5 Administrative Personnel 1 2010-01-01 2010-01-01 false Definitions. 185.102 Section 185.102... § 185.102 Definitions. For the purposes of this part— ALJ means an Administrative Law Judge in the... or statement is false, fictitious, or fraudulent; (b) Acts in deliberate ignorance of the truth...

  1. 5 CFR 185.135 - The record.

    Code of Federal Regulations, 2010 CFR

    2010-01-01

    ... 5 Administrative Personnel 1 2010-01-01 2010-01-01 false The record. 185.135 Section 185.135... § 185.135 The record. (a) The hearing shall be recorded and transcribed. Transcripts may be obtained following the hearing from the ALJ at a cost not to exceed the actual cost of duplication. (b)...

  2. 21 CFR 146.185 - Pineapple juice.

    Code of Federal Regulations, 2014 CFR

    2014-04-01

    ... 21 Food and Drugs 2 2014-04-01 2014-04-01 false Pineapple juice. 146.185 Section 146.185 Food and....185 Pineapple juice. (a) Identity. (1) Pineapple juice is the juice, intended for direct consumption..., ripe pineapple (Ananas comosus L. Merrill). The juice may have been concentrated and...

  3. 21 CFR 146.185 - Pineapple juice.

    Code of Federal Regulations, 2010 CFR

    2010-04-01

    ... 21 Food and Drugs 2 2010-04-01 2010-04-01 false Pineapple juice. 146.185 Section 146.185 Food and....185 Pineapple juice. (a) Identity. (1) Pineapple juice is the juice, intended for direct consumption..., ripe pineapple (Ananas comosus L. Merrill). The juice may have been concentrated and...

  4. 40 CFR 68.185 - Certification.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ... 40 Protection of Environment 15 2010-07-01 2010-07-01 false Certification. 68.185 Section 68.185... ACCIDENT PREVENTION PROVISIONS Risk Management Plan § 68.185 Certification. (a) For Program 1 processes, the owner or operator shall submit in the RMP the certification statement provided in §...

  5. 46 CFR 185.702 - Maintenance.

    Code of Federal Regulations, 2011 CFR

    2011-10-01

    ... 46 Shipping 7 2011-10-01 2011-10-01 false Maintenance. 185.702 Section 185.702 Shipping COAST...) OPERATIONS Operational Readiness, Maintenance, and Inspection of Lifesaving Equipment § 185.702 Maintenance. (a) The manufacturer's instructions for onboard maintenance of survival craft, rescue boats,...

  6. 33 CFR 117.185 - Pacheco Creek.

    Code of Federal Regulations, 2013 CFR

    2013-07-01

    ... 33 Navigation and Navigable Waters 1 2013-07-01 2013-07-01 false Pacheco Creek. 117.185 Section 117.185 Navigation and Navigable Waters COAST GUARD, DEPARTMENT OF HOMELAND SECURITY BRIDGES DRAWBRIDGE OPERATION REGULATIONS Specific Requirements California § 117.185 Pacheco Creek. The draw of the Contra Costa County highway bridge, mile 1.0,...

  7. 5 CFR 185.104 - Investigation.

    Code of Federal Regulations, 2013 CFR

    2013-01-01

    ... 5 Administrative Personnel 1 2013-01-01 2013-01-01 false Investigation. 185.104 Section 185.104... § 185.104 Investigation. (a) If an investigating official concludes that a subpoena pursuant to the... submit a report containing the findings and conclusions of such investigation to the reviewing...

  8. 5 CFR 185.104 - Investigation.

    Code of Federal Regulations, 2011 CFR

    2011-01-01

    ... 5 Administrative Personnel 1 2011-01-01 2011-01-01 false Investigation. 185.104 Section 185.104... § 185.104 Investigation. (a) If an investigating official concludes that a subpoena pursuant to the... submit a report containing the findings and conclusions of such investigation to the reviewing...

  9. 5 CFR 185.104 - Investigation.

    Code of Federal Regulations, 2012 CFR

    2012-01-01

    ... 5 Administrative Personnel 1 2012-01-01 2012-01-01 false Investigation. 185.104 Section 185.104... § 185.104 Investigation. (a) If an investigating official concludes that a subpoena pursuant to the... submit a report containing the findings and conclusions of such investigation to the reviewing...

  10. 5 CFR 185.104 - Investigation.

    Code of Federal Regulations, 2010 CFR

    2010-01-01

    ... 5 Administrative Personnel 1 2010-01-01 2010-01-01 false Investigation. 185.104 Section 185.104... § 185.104 Investigation. (a) If an investigating official concludes that a subpoena pursuant to the... submit a report containing the findings and conclusions of such investigation to the reviewing...

  11. 5 CFR 185.104 - Investigation.

    Code of Federal Regulations, 2014 CFR

    2014-01-01

    ... 5 Administrative Personnel 1 2014-01-01 2014-01-01 false Investigation. 185.104 Section 185.104... § 185.104 Investigation. (a) If an investigating official concludes that a subpoena pursuant to the... submit a report containing the findings and conclusions of such investigation to the reviewing...

  12. 21 CFR 145.185 - Canned plums.

    Code of Federal Regulations, 2010 CFR

    2010-04-01

    ... 21 Food and Drugs 2 2010-04-01 2010-04-01 false Canned plums. 145.185 Section 145.185 Food and... CONSUMPTION CANNED FRUITS Requirements for Specific Standardized Canned Fruits § 145.185 Canned plums. (a) Identity—(1) Ingredients. Canned plums is the food prepared from clean, sound, and mature fruit of...

  13. 21 CFR 145.185 - Canned plums.

    Code of Federal Regulations, 2014 CFR

    2014-04-01

    ... 21 Food and Drugs 2 2014-04-01 2014-04-01 false Canned plums. 145.185 Section 145.185 Food and... CONSUMPTION CANNED FRUITS Requirements for Specific Standardized Canned Fruits § 145.185 Canned plums. (a) Identity—(1) Ingredients. Canned plums is the food prepared from clean, sound, and mature fruit of...

  14. 21 CFR 145.185 - Canned plums.

    Code of Federal Regulations, 2012 CFR

    2012-04-01

    ... 21 Food and Drugs 2 2012-04-01 2012-04-01 false Canned plums. 145.185 Section 145.185 Food and... CONSUMPTION CANNED FRUITS Requirements for Specific Standardized Canned Fruits § 145.185 Canned plums. (a) Identity—(1) Ingredients. Canned plums is the food prepared from clean, sound, and mature fruit of...

  15. 21 CFR 145.185 - Canned plums.

    Code of Federal Regulations, 2013 CFR

    2013-04-01

    ... 21 Food and Drugs 2 2013-04-01 2013-04-01 false Canned plums. 145.185 Section 145.185 Food and... CONSUMPTION CANNED FRUITS Requirements for Specific Standardized Canned Fruits § 145.185 Canned plums. (a) Identity—(1) Ingredients. Canned plums is the food prepared from clean, sound, and mature fruit of...

  16. 21 CFR 145.185 - Canned plums.

    Code of Federal Regulations, 2011 CFR

    2011-04-01

    ... 21 Food and Drugs 2 2011-04-01 2011-04-01 false Canned plums. 145.185 Section 145.185 Food and... CONSUMPTION CANNED FRUITS Requirements for Specific Standardized Canned Fruits § 145.185 Canned plums. (a) Identity—(1) Ingredients. Canned plums is the food prepared from clean, sound, and mature fruit of...

  17. 32 CFR 18.5 - Relationships.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ... 32 National Defense 1 2010-07-01 2010-07-01 false Relationships. 18.5 Section 18.5 National Defense Department of Defense OFFICE OF THE SECRETARY OF DEFENSE MILITARY COMMISSIONS APPOINTING AUTHORITY FOR MILITARY COMMISSIONS § 18.5 Relationships. (a) In the performance of assigned functions...

  18. 32 CFR 18.5 - Relationships.

    Code of Federal Regulations, 2011 CFR

    2011-07-01

    ... 32 National Defense 1 2011-07-01 2011-07-01 false Relationships. 18.5 Section 18.5 National Defense Department of Defense OFFICE OF THE SECRETARY OF DEFENSE MILITARY COMMISSIONS APPOINTING AUTHORITY FOR MILITARY COMMISSIONS § 18.5 Relationships. (a) In the performance of assigned functions...

  19. 5 CFR 185.126 - Evidence.

    Code of Federal Regulations, 2011 CFR

    2011-01-01

    ... 5 Administrative Personnel 1 2011-01-01 2011-01-01 false Evidence. 185.126 Section 185.126... § 185.126 Evidence. (a) The ALJ shall determine the admissibility of evidence. (b) Except as provided in this part, the ALJ shall not be bound by the Federal Rules of Evidence. However, the ALJ may apply...

  20. 5 CFR 185.126 - Evidence.

    Code of Federal Regulations, 2013 CFR

    2013-01-01

    ... 5 Administrative Personnel 1 2013-01-01 2013-01-01 false Evidence. 185.126 Section 185.126... § 185.126 Evidence. (a) The ALJ shall determine the admissibility of evidence. (b) Except as provided in this part, the ALJ shall not be bound by the Federal Rules of Evidence. However, the ALJ may apply...

  1. 32 CFR 185.3 - Definitions.

    Code of Federal Regulations, 2011 CFR

    2011-07-01

    ... 32 National Defense 1 2011-07-01 2011-07-01 false Definitions. 185.3 Section 185.3 National... AUTHORITIES (DSCA) § 185.3 Definitions. Civil Authorities. See Joint Publication 1-02 14 . 14 Available by... necessary to prevent significant loss of life or wanton destruction of property and are necessary to...

  2. 5 CFR 185.101 - Purpose.

    Code of Federal Regulations, 2011 CFR

    2011-01-01

    ... 5 Administrative Personnel 1 2011-01-01 2011-01-01 false Purpose. 185.101 Section 185.101... § 185.101 Purpose. This subpart implements the Program Fraud Civil Remedies Act of 1986, Public Law 99-509, 6101-6104, 100 Stat. 1874 (October 21, 1986), codified at 31 U.S.C. 3801-3812. Section...

  3. 46 CFR 185.304 - Navigation underway.

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    ... 46 Shipping 7 2010-10-01 2010-10-01 false Navigation underway. 185.304 Section 185.304 Shipping COAST GUARD, DEPARTMENT OF HOMELAND SECURITY (CONTINUED) SMALL PASSENGER VESSELS (UNDER 100 GROSS TONS) OPERATIONS Miscellaneous Operating Requirements § 185.304 Navigation underway. (a) The movement of...

  4. 46 CFR 185.304 - Navigation underway.

    Code of Federal Regulations, 2012 CFR

    2012-10-01

    ... 46 Shipping 7 2012-10-01 2012-10-01 false Navigation underway. 185.304 Section 185.304 Shipping COAST GUARD, DEPARTMENT OF HOMELAND SECURITY (CONTINUED) SMALL PASSENGER VESSELS (UNDER 100 GROSS TONS) OPERATIONS Miscellaneous Operating Requirements § 185.304 Navigation underway. (a) The movement of...

  5. 46 CFR 185.304 - Navigation underway.

    Code of Federal Regulations, 2014 CFR

    2014-10-01

    ... 46 Shipping 7 2014-10-01 2014-10-01 false Navigation underway. 185.304 Section 185.304 Shipping COAST GUARD, DEPARTMENT OF HOMELAND SECURITY (CONTINUED) SMALL PASSENGER VESSELS (UNDER 100 GROSS TONS) OPERATIONS Miscellaneous Operating Requirements § 185.304 Navigation underway. (a) The movement of...

  6. 46 CFR 185.304 - Navigation underway.

    Code of Federal Regulations, 2013 CFR

    2013-10-01

    ... 46 Shipping 7 2013-10-01 2013-10-01 false Navigation underway. 185.304 Section 185.304 Shipping COAST GUARD, DEPARTMENT OF HOMELAND SECURITY (CONTINUED) SMALL PASSENGER VESSELS (UNDER 100 GROSS TONS) OPERATIONS Miscellaneous Operating Requirements § 185.304 Navigation underway. (a) The movement of...

  7. 46 CFR 185.304 - Navigation underway.

    Code of Federal Regulations, 2011 CFR

    2011-10-01

    ... 46 Shipping 7 2011-10-01 2011-10-01 false Navigation underway. 185.304 Section 185.304 Shipping COAST GUARD, DEPARTMENT OF HOMELAND SECURITY (CONTINUED) SMALL PASSENGER VESSELS (UNDER 100 GROSS TONS) OPERATIONS Miscellaneous Operating Requirements § 185.304 Navigation underway. (a) The movement of...

  8. 5 CFR 185.135 - The record.

    Code of Federal Regulations, 2013 CFR

    2013-01-01

    ... 5 Administrative Personnel 1 2013-01-01 2013-01-01 false The record. 185.135 Section 185.135... § 185.135 The record. (a) The hearing shall be recorded and transcribed. Transcripts may be obtained following the hearing from the ALJ at a cost not to exceed the actual cost of duplication. (b)...

  9. 5 CFR 185.135 - The record.

    Code of Federal Regulations, 2012 CFR

    2012-01-01

    ... 5 Administrative Personnel 1 2012-01-01 2012-01-01 false The record. 185.135 Section 185.135... § 185.135 The record. (a) The hearing shall be recorded and transcribed. Transcripts may be obtained following the hearing from the ALJ at a cost not to exceed the actual cost of duplication. (b)...

  10. 5 CFR 185.135 - The record.

    Code of Federal Regulations, 2014 CFR

    2014-01-01

    ... 5 Administrative Personnel 1 2014-01-01 2014-01-01 false The record. 185.135 Section 185.135... § 185.135 The record. (a) The hearing shall be recorded and transcribed. Transcripts may be obtained following the hearing from the ALJ at a cost not to exceed the actual cost of duplication. (b)...

  11. 5 CFR 185.135 - The record.

    Code of Federal Regulations, 2011 CFR

    2011-01-01

    ... 5 Administrative Personnel 1 2011-01-01 2011-01-01 false The record. 185.135 Section 185.135... § 185.135 The record. (a) The hearing shall be recorded and transcribed. Transcripts may be obtained following the hearing from the ALJ at a cost not to exceed the actual cost of duplication. (b)...

  12. 46 CFR 185.503 - Voyage plan.

    Code of Federal Regulations, 2011 CFR

    2011-10-01

    ... 46 Shipping 7 2011-10-01 2011-10-01 false Voyage plan. 185.503 Section 185.503 Shipping COAST...) OPERATIONS Preparations for Emergencies § 185.503 Voyage plan. (a) The master of the following vessels shall prepare a voyage plan: (1) A vessel making an oceans or coastwise voyage; (2) A vessel making a voyage...

  13. 46 CFR 185.702 - Maintenance.

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    ... 46 Shipping 7 2010-10-01 2010-10-01 false Maintenance. 185.702 Section 185.702 Shipping COAST...) OPERATIONS Operational Readiness, Maintenance, and Inspection of Lifesaving Equipment § 185.702 Maintenance. (a) The manufacturer's instructions for onboard maintenance of survival craft, rescue boats,...

  14. Rhenium labeled peptides and antibodies for cancer therapy. CRADA final report

    SciTech Connect

    Knapp, Jr., F. F.; Rhodes, B. A.

    1996-08-12

    This CRADA involved development of optimal methods for attachment of rhenium radioisotopes to antibodies and peptides which can be used for cancer treatment. Rhenium-186 and the tungsten-188/rhenium-188 generators were provided from ORNL to RhoMed for peptide labeling studies. The rhenium-186 and carrier-free rhenium-188 were then used to optimize the labeling of various small peptides....A system has been developed at ORNL which provides the rhenium-188 radioisotope, which has excellent therapeutic properties for cancer treatment.

  15. Toward hypoxia-selective rhenium and technetium tricarbonyl complexes.

    PubMed

    North, Andrea J; Hayne, David J; Schieber, Christine; Price, Katherine; White, Anthony R; Crouch, Peter J; Rigopoulos, Angela; O'Keefe, Graeme J; Tochon-Danguy, Henri; Scott, Andrew M; White, Jonathan M; Ackermann, Uwe; Donnelly, Paul S

    2015-10-05

    With the aim of preparing hypoxia-selective imaging and therapeutic agents, technetium(I) and rhenium(I) tricarbonyl complexes with pyridylhydrazone, dipyridylamine, and pyridylaminocarboxylate ligands containing nitrobenzyl or nitroimidazole functional groups have been prepared. The rhenium tricarbonyl complexes were synthesized with short reaction times using microwave irradiation. Rhenium tricarbonyl complexes with deprotonated p-nitrophenyl pyridylhydrazone ligands are luminescent, and this has been used to track their uptake in HeLa cells using confocal fluorescent microscopy. Selected rhenium tricarbonyl complexes displayed higher uptake in hypoxic cells when compared to normoxic cells. A (99m)Tc tricarbonyl complex with a dipyridylamine ligand bearing a nitroimidazole functional group is stable in human serum and was shown to localize in a human renal cell carcinoma (RCC; SK-RC-52) tumor in a mouse.

  16. Modification of 1,2,4,5-tetrazine with cationic rhenium(I) polypyridine units to afford phosphorogenic bioorthogonal probes with enhanced reaction kinetics.

    PubMed

    Choi, Alex Wing-Tat; Tso, Karson Ka-Shun; Yim, Vicki Man-Wai; Liu, Hua-Wei; Lo, Kenneth Kam-Wing

    2015-02-25

    New phosphorogenic bioorthogonal probes derived from mononuclear and binuclear rhenium(I) polypyridine complexes containing a 1,2,4,5-tetrazine moiety were designed; these complexes displayed substantial dienophile-induced emission enhancement, and accelerated reaction kinetics and could target a protein conjugate in living cells.

  17. Optical and Chemical Properties of Mixed-valent Rhenium Oxide Films Synthesized by Reactive DC Magnetron Sputtering

    DTIC Science & Technology

    2015-04-03

    oxygen– argon environment. The oxygen and argon flow rates were systematically varied, while the extinction coefficient, k, of the deposited layers was...deposited using reactive magnetron sputtering employing a metallic rhenium target within an oxygen– argon environment. The oxygen and argon flow rates...throughout film growth, allows for the selection of oxygen (QO2) and argon (QAr) flow rates capable of increasing ReO3 content within the films

  18. 40 CFR 421.210 - Applicability: Description of the primary molybdenum and rhenium subcategory.

    Code of Federal Regulations, 2013 CFR

    2013-07-01

    ... primary molybdenum and rhenium subcategory. 421.210 Section 421.210 Protection of Environment... POINT SOURCE CATEGORY Primary Molybdenum and Rhenium Subcategory § 421.210 Applicability: Description of the primary molybdenum and rhenium subcategory. The provisions of this subpart are applicable...

  19. 40 CFR 421.210 - Applicability: Description of the primary molybdenum and rhenium subcategory.

    Code of Federal Regulations, 2012 CFR

    2012-07-01

    ... primary molybdenum and rhenium subcategory. 421.210 Section 421.210 Protection of Environment... POINT SOURCE CATEGORY Primary Molybdenum and Rhenium Subcategory § 421.210 Applicability: Description of the primary molybdenum and rhenium subcategory. The provisions of this subpart are applicable...

  20. 40 CFR 421.210 - Applicability: Description of the primary molybdenum and rhenium subcategory.

    Code of Federal Regulations, 2014 CFR

    2014-07-01

    ... primary molybdenum and rhenium subcategory. 421.210 Section 421.210 Protection of Environment... POINT SOURCE CATEGORY Primary Molybdenum and Rhenium Subcategory § 421.210 Applicability: Description of the primary molybdenum and rhenium subcategory. The provisions of this subpart are applicable...

  1. 40 CFR 421.210 - Applicability: Description of the primary molybdenum and rhenium subcategory.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ... primary molybdenum and rhenium subcategory. 421.210 Section 421.210 Protection of Environment... POINT SOURCE CATEGORY Primary Molybdenum and Rhenium Subcategory § 421.210 Applicability: Description of the primary molybdenum and rhenium subcategory. The provisions of this subpart are applicable...

  2. 40 CFR 421.210 - Applicability: Description of the primary molybdenum and rhenium subcategory.

    Code of Federal Regulations, 2011 CFR

    2011-07-01

    ... primary molybdenum and rhenium subcategory. 421.210 Section 421.210 Protection of Environment... POINT SOURCE CATEGORY Primary Molybdenum and Rhenium Subcategory § 421.210 Applicability: Description of the primary molybdenum and rhenium subcategory. The provisions of this subpart are applicable...

  3. Determination of rhenium in molybdenite by X-ray fluorescence. A combined chemical-spectrometric technique

    USGS Publications Warehouse

    Solt, M.W.; Wahlberg, J.S.; Myers, A.T.

    1969-01-01

    Rhenium in molybdenite is separated from molybdenum by distillation of rhenium heptoxide from a perchloric-sulphuric acid mixture. It is concentrated by precipitation of the sulphide and then determined by X-ray fluorescence. From 3 to 1000 ??g of rhenium can be measured with a precision generally within 2%. The procedure tolerates larger amounts of molybdenum than the usual colorimetric methods. ?? 1969.

  4. Room-Temperature Tensile Behavior of Oriented Tungsten Single Crystals with Rhenium in Dilute Solid Solution

    DTIC Science & Technology

    1966-01-01

    SINGLE CRYSTALS WITH RHENIUM IN DILUTE SOLID SOLUTION Sby M. Garfinkle Lewis Research Center Cleveland, Ohio 20060516196 NATIONAL AERONAUTICS AND...WITH RHENIUM IN DILUTE SOLID SOLUTION By M. Garfinkle Lewis Research Center Cleveland, Ohio NATIONAL AERONAUTICS AND SPACE ADMINISTRATION For sale by...ORIENTED TUNGSTEN SINGLE CRYSTALS WITH RHENIUM IN DILUTE SOLID SOLUTION * by M. Garfinkle Lewis Research Center SUMMARY Tungsten single crystals

  5. Rhenium-188: availability from the (188)W/(188)Re generator and status of current applications.

    PubMed

    Pillai, M R A; Dash, Ashutosh; Knapp, F F

    2012-07-01

    Rhenium-188 is one of the most readily available generator derived and useful radionuclides for therapy emitting β(-) particles (2.12 MeV, 71.1% and 1.965 MeV, 25.6%) and imageable gammas (155 keV, 15.1%). The (188)W/(188)Re generator is an ideal source for the long term (4-6 months) continuous availability of no carrier added (nca) (188)Re suitable for the preparation of radiopharmaceuticals for radionuclide therapy. The challenges associated with the double neutron capture route of production of the parent (188)W radionuclide have been a major impediment in the progress of application of (188)Re. Tungsten-188 of adequate specific activity can be prepared only in 2-3 of the high flux reactors operating in the World. Several useful technologies have been developed for the preparation of clinical grade (188)W/(188)Re generators. Since the specific activity of (188)W used in the generator is relatively low 185 GBq( < 5 Ci)/g], the eluted (188)ReO(4)(-) can have low radioactive concentration often insufficient for radiopharmaceutical preparation. However, several efficient post elution concentration techniques have been developed that yield clinically useful (188)ReO(4)(-) solutions. Rhenium-188 has been used for the preparation of therapeutic radiopharmaceuticals for the management of diseases such as bone metastasis, rheumatoid arthritis and primary cancers. Several early phase clinical studies using radiopharmaceuticals based on (188)Re-labeled phosphonates, antibodies, peptides, lipiodol and particulates have been reported. This article reviews the availability and use of (188)Re including a discussion of why broader use of (188)Re has not progressed as expected as a popular radionuclide for therapy.

  6. 32 CFR 185.3 - Definitions.

    Code of Federal Regulations, 2012 CFR

    2012-07-01

    ... 32 National Defense 1 2012-07-01 2012-07-01 false Definitions. 185.3 Section 185.3 National Defense Department of Defense OFFICE OF THE SECRETARY OF DEFENSE CIVIL DEFENSE DEFENSE SUPPORT OF CIVIL...' Security Affairs (ASD(HD&ASA)) serves as the Defense Domestic Crisis Manager. Defense Support of...

  7. 32 CFR 185.1 - Purpose.

    Code of Federal Regulations, 2012 CFR

    2012-07-01

    ... 32 National Defense 1 2012-07-01 2012-07-01 false Purpose. 185.1 Section 185.1 National Defense Department of Defense OFFICE OF THE SECRETARY OF DEFENSE CIVIL DEFENSE DEFENSE SUPPORT OF CIVIL AUTHORITIES... referred to as civil support. (b) Supplements the regulations (in DoD Directive 5525.5) 1 required...

  8. 32 CFR 185.1 - Purpose.

    Code of Federal Regulations, 2014 CFR

    2014-07-01

    ... 32 National Defense 1 2014-07-01 2014-07-01 false Purpose. 185.1 Section 185.1 National Defense Department of Defense OFFICE OF THE SECRETARY OF DEFENSE CIVIL DEFENSE DEFENSE SUPPORT OF CIVIL AUTHORITIES... referred to as civil support. (b) Supplements the regulations (in DoD Directive 5525.5) 1 required...

  9. 32 CFR 185.1 - Purpose.

    Code of Federal Regulations, 2013 CFR

    2013-07-01

    ... 32 National Defense 1 2013-07-01 2013-07-01 false Purpose. 185.1 Section 185.1 National Defense Department of Defense OFFICE OF THE SECRETARY OF DEFENSE CIVIL DEFENSE DEFENSE SUPPORT OF CIVIL AUTHORITIES... referred to as civil support. (b) Supplements the regulations (in DoD Directive 5525.5) 1 required...

  10. 32 CFR 185.3 - Definitions.

    Code of Federal Regulations, 2014 CFR

    2014-07-01

    ... 32 National Defense 1 2014-07-01 2014-07-01 false Definitions. 185.3 Section 185.3 National Defense Department of Defense OFFICE OF THE SECRETARY OF DEFENSE CIVIL DEFENSE DEFENSE SUPPORT OF CIVIL...' Security Affairs (ASD(HD&ASA)) serves as the Defense Domestic Crisis Manager. Defense Support of...

  11. 32 CFR 185.1 - Purpose.

    Code of Federal Regulations, 2011 CFR

    2011-07-01

    ... 32 National Defense 1 2011-07-01 2011-07-01 false Purpose. 185.1 Section 185.1 National Defense Department of Defense OFFICE OF THE SECRETARY OF DEFENSE CIVIL DEFENSE DEFENSE SUPPORT OF CIVIL AUTHORITIES... referred to as civil support. (b) Supplements the regulations (in DoD Directive 5525.5) 1 required...

  12. 19 CFR 18.5 - Diversion.

    Code of Federal Regulations, 2010 CFR

    2010-04-01

    ... 19 Customs Duties 1 2010-04-01 2010-04-01 false Diversion. 18.5 Section 18.5 Customs Duties U.S. CUSTOMS AND BORDER PROTECTION, DEPARTMENT OF HOMELAND SECURITY; DEPARTMENT OF THE TREASURY TRANSPORTATION... regulations of the Agricultural Research Service of the Department of Agriculture shall be allowed only...

  13. 27 CFR 555.185 - Criminal sanctions.

    Code of Federal Regulations, 2010 CFR

    2010-04-01

    ... 27 Alcohol, Tobacco Products and Firearms 3 2010-04-01 2010-04-01 false Criminal sanctions. 555.185 Section 555.185 Alcohol, Tobacco Products, and Firearms BUREAU OF ALCOHOL, TOBACCO, FIREARMS, AND... Criminal sanctions. Any person who violates the provisions of 18 U.S.C. 842(l)-(o) shall be fined...

  14. 27 CFR 27.185 - Customs release.

    Code of Federal Regulations, 2010 CFR

    2010-04-01

    ... 27 Alcohol, Tobacco Products and Firearms 1 2010-04-01 2010-04-01 false Customs release. 27.185... Distilled Spirits From Customs Custody Free of Tax for Use of the United States § 27.185 Customs release. (a) Upon receipt of appropriate customs entry and a photocopy of a permit, Form 5150.33 or...

  15. 5 CFR 185.120 - Prehearing conferences.

    Code of Federal Regulations, 2010 CFR

    2010-01-01

    ... 5 Administrative Personnel 1 2010-01-01 2010-01-01 false Prehearing conferences. 185.120 Section... FRAUD CIVIL REMEDIES § 185.120 Prehearing conferences. (a) The ALJ may schedule prehearing conferences... conference at a reasonable time in advance of the hearing. (c) The ALJ may use prehearing conferences...

  16. 27 CFR 555.185 - Criminal sanctions.

    Code of Federal Regulations, 2014 CFR

    2014-04-01

    ... 27 Alcohol, Tobacco Products and Firearms 3 2014-04-01 2014-04-01 false Criminal sanctions. 555.185 Section 555.185 Alcohol, Tobacco Products, and Firearms BUREAU OF ALCOHOL, TOBACCO, FIREARMS, AND EXPLOSIVES, DEPARTMENT OF JUSTICE EXPLOSIVES COMMERCE IN EXPLOSIVES Marking of Plastic Explosives §...

  17. 40 CFR 300.185 - Nongovernmental participation.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ... 40 Protection of Environment 27 2010-07-01 2010-07-01 false Nongovernmental participation. 300.185... PLAN Responsibility and Organization for Response § 300.185 Nongovernmental participation. (a) Industry... from on-scene operations. (d) Nongovernmental participation must be in compliance with the...

  18. 40 CFR 300.185 - Nongovernmental participation.

    Code of Federal Regulations, 2011 CFR

    2011-07-01

    ... 40 Protection of Environment 28 2011-07-01 2011-07-01 false Nongovernmental participation. 300.185... PLAN Responsibility and Organization for Response § 300.185 Nongovernmental participation. (a) Industry... from on-scene operations. (d) Nongovernmental participation must be in compliance with the...

  19. 40 CFR 300.185 - Nongovernmental participation.

    Code of Federal Regulations, 2013 CFR

    2013-07-01

    ... 40 Protection of Environment 29 2013-07-01 2013-07-01 false Nongovernmental participation. 300.185... PLAN Responsibility and Organization for Response § 300.185 Nongovernmental participation. (a) Industry... from on-scene operations. (d) Nongovernmental participation must be in compliance with the...

  20. 40 CFR 300.185 - Nongovernmental participation.

    Code of Federal Regulations, 2014 CFR

    2014-07-01

    ... 40 Protection of Environment 28 2014-07-01 2014-07-01 false Nongovernmental participation. 300.185... PLAN Responsibility and Organization for Response § 300.185 Nongovernmental participation. (a) Industry... from on-scene operations. (d) Nongovernmental participation must be in compliance with the...

  1. 40 CFR 300.185 - Nongovernmental participation.

    Code of Federal Regulations, 2012 CFR

    2012-07-01

    ... 40 Protection of Environment 29 2012-07-01 2012-07-01 false Nongovernmental participation. 300.185... PLAN Responsibility and Organization for Response § 300.185 Nongovernmental participation. (a) Industry... from on-scene operations. (d) Nongovernmental participation must be in compliance with the...

  2. 15 CFR 922.185 - Emergency regulations.

    Code of Federal Regulations, 2011 CFR

    2011-01-01

    ... 922.185 Commerce and Foreign Trade Regulations Relating to Commerce and Foreign Trade (Continued... MANAGEMENT NATIONAL MARINE SANCTUARY PROGRAM REGULATIONS Hawaiian Islands Humpback Whale National Marine Sanctuary § 922.185 Emergency regulations. Where necessary to prevent or minimize the destruction of,...

  3. 15 CFR 922.185 - Emergency regulations.

    Code of Federal Regulations, 2014 CFR

    2014-01-01

    ... 922.185 Commerce and Foreign Trade Regulations Relating to Commerce and Foreign Trade (Continued... MANAGEMENT NATIONAL MARINE SANCTUARY PROGRAM REGULATIONS Hawaiian Islands Humpback Whale National Marine Sanctuary § 922.185 Emergency regulations. Where necessary to prevent or minimize the destruction of,...

  4. 15 CFR 922.185 - Emergency regulations.

    Code of Federal Regulations, 2010 CFR

    2010-01-01

    ... 922.185 Commerce and Foreign Trade Regulations Relating to Commerce and Foreign Trade (Continued... MANAGEMENT NATIONAL MARINE SANCTUARY PROGRAM REGULATIONS Hawaiian Islands Humpback Whale National Marine Sanctuary § 922.185 Emergency regulations. Where necessary to prevent or minimize the destruction of,...

  5. 15 CFR 922.185 - Emergency regulations.

    Code of Federal Regulations, 2012 CFR

    2012-01-01

    ... 922.185 Commerce and Foreign Trade Regulations Relating to Commerce and Foreign Trade (Continued... MANAGEMENT NATIONAL MARINE SANCTUARY PROGRAM REGULATIONS Hawaiian Islands Humpback Whale National Marine Sanctuary § 922.185 Emergency regulations. Where necessary to prevent or minimize the destruction of,...

  6. 15 CFR 922.185 - Emergency regulations.

    Code of Federal Regulations, 2013 CFR

    2013-01-01

    ... 922.185 Commerce and Foreign Trade Regulations Relating to Commerce and Foreign Trade (Continued... MANAGEMENT NATIONAL MARINE SANCTUARY PROGRAM REGULATIONS Hawaiian Islands Humpback Whale National Marine Sanctuary § 922.185 Emergency regulations. Where necessary to prevent or minimize the destruction of,...

  7. Effect of rhenium on the structure and properties of the weld metal of a molybdenum alloy

    NASA Technical Reports Server (NTRS)

    Dyachenko, V. V.; Morozov, B. P.; Tylkina, M. A.; Savitskiy, Y. M.; Nikishanov, V. V.

    1984-01-01

    The structure and properties of welds made in molybdenum alloy VM-1 as a function of rhenium concentrations in the weld metal were studied. Rhenium was introduced into the weld using rhenium wire and tape or wires of Mo-47Re and Mo-52Re alloys. The properties of the weld metal were studied by means of metallographic techniques, electron microscopy, X-ray analysis, and autoradiography. The plasticity of the weld metal sharply was found to increase with increasing concentration of rhenium up to 50%. During welding, a decarburization process was observed which was more pronounced at higher concentrations of rhenium.

  8. The Role of Rhenium on the Temporal Evolution of the Nanostructure of a Model Ni-Al-Cr-Re Superalloy

    NASA Technical Reports Server (NTRS)

    Yoon, Kevin E.; Noebe, Ronald D.; Seidman, David N.

    2004-01-01

    Rhenium (2 at.%) additions to a model Ni-8.5 at.% Cr-10 at.% Al alloy are studied with respect to its effects on the temporal evolution of the nanostructure and the partitioning behavior of the four elements between the gamma (fcc) and gamma' (L1(sub 2)) phases. Chemical evolution of this quaternary alloy aged at 1073 K from 0.25 to 264 h, is investigated by three-dimensional atom-probe (3DAP) microscopy. The morphology of gamma'-precipitates remains spheroidal, even at an aging time of 264 h. The results demonstrate that Re slows the coarsening of gamma'-precipitates, in comparison to the ternary Ni-10 at.% A1-8.5 at.% Cr alloy at 1073 K.

  9. Mechanical properties of electron-beam-melted molybdenum and dilute molybdenum-rhenium alloys

    NASA Technical Reports Server (NTRS)

    Klopp, W. D.; Witzke, W. R.

    1972-01-01

    A study of molybdenum and three dilute molybdenum-rhenium alloys was undertaken to determine the effects of rhenium on the low temperature ductility and other mechanical properties of molybdenum. Alloys containing 3.9, 5.9, and 7.7 atomic percent rhenium exhibited lower ductile-brittle transition temperatures than did the unalloyed molybdenum. The maximum improvement in the annealed condition was observed for molybdenum - 7.7 rhenium, which had a ductile-brittle transition temperature approximately 200 C (360 F) lower than that for unalloyed molybdenum. Rhenium additions also increased the low and high temperature tensile strengths and the high temperature creep strength of molybdenum. The mechanical behavior of dilute molybdenum-rhenium alloys is similar to that observed for dilute tungsten-rhenium alloys.

  10. Mechanistic Study of Oxygen Atom Transfer Catalyzed by Rhenium Compounds

    SciTech Connect

    Shan, Xiaopeng

    2003-01-01

    Two ionic and one neutral methyl(oxo)rhenium(V) compounds were synthesized and structurally characterized. They were compared in reactivity towards the ligands triphenylphosphane, pyridines, pyridine N-oxides. Assistance from Broensted bases was found on ligand displacement of ionic rhenium compounds as well as nucleophile assistance on oxidation of all compounds. From the kinetic data, crystal structures, and an analysis of the intermediates, a structural formula of PicH+3- and mechanisms of ligand displacement and oxidation were proposed.

  11. Rhenium-catalyzed deoxydehydration of diols and polyols.

    PubMed

    Dethlefsen, Johannes R; Fristrup, Peter

    2015-03-01

    The substitution of platform chemicals of fossil origin by biomass-derived analogues requires the development of chemical transformations capable of reducing the very high oxygen content of biomass. One such reaction, which has received increasing attention within the past five years, is the rhenium-catalyzed deoxydehydration (DODH) of a vicinal diol into an alkene; this is a model system for abundant polyols like glycerol and sugar alcohols. The present contribution includes a review of early investigations of stoichiometric reactions involving rhenium, diols, and alkenes followed by a discussion of the various catalytic systems that have been developed with emphasis on the nature of the reductant, the substrate scope, and mechanistic investigations.

  12. ZNF185, an actin-cytoskeleton-associated growth inhibitory LIM protein in prostate cancer.

    PubMed

    Zhang, J-S; Gong, A; Young, C Y F

    2007-01-04

    We have recently identified ZNF185 as a gene that is downregulated in prostate cancer (PCa), in part via epigenetic alteration, and maybe associated with disease progression. In this study, we cloned the ZNF185 cDNA from normal human prostate tissues and investigated its biological function. We show that ZNF185 is a novel actin-cytoskeleton-associated Lin-l 1, Isl-1 and Mec-3 (LIM) domain-containing protein that localizes to F-actin structures, and is enriched at focal adhesions. We find that the NH(2)-terminal region, which we designate the actin-targeting domain, facilitates ZNF185 binding to actin in vitro and is both necessary and sufficient to mediate actin-cytoskeleton targeting of ZNF185, whereas the LIM domain, which is localized in the COOH-terminus is dispensable for this phenomenon. Interestingly, ectopic expression of full-length ZNF185, but not a mutant lacking the actin-targeting domain, could suppress proliferation and anchorage-independent growth of PCa cells. Together, our data suggest that ZNF185 may function as a tumor-suppressor protein by associating with the actin-cytoskeleton.

  13. 40 CFR 68.185 - Certification.

    Code of Federal Regulations, 2011 CFR

    2011-07-01

    ... ACCIDENT PREVENTION PROVISIONS Risk Management Plan § 68.185 Certification. (a) For Program 1 processes... certification that, to the best of the signer's knowledge, information, and belief formed after...

  14. 40 CFR 68.185 - Certification.

    Code of Federal Regulations, 2013 CFR

    2013-07-01

    ... ACCIDENT PREVENTION PROVISIONS Risk Management Plan § 68.185 Certification. (a) For Program 1 processes... certification that, to the best of the signer's knowledge, information, and belief formed after...

  15. Characterization of rhenium oxide films and their application to liquid crystal cells

    NASA Astrophysics Data System (ADS)

    Cazzanelli, E.; Castriota, M.; Marino, S.; Scaramuzza, N.; Purans, J.; Kuzmin, A.; Kalendarev, R.; Mariotto, G.; Das, G.

    2009-06-01

    Rhenium trioxide exhibits high electronic conductivity, while its open cubic crystal structure allows an appreciable hydrogen intercalation, generating disordered solid phases, with protonic conductivity. Rhenium oxide thin films have been obtained by thermal evaporation of ReO3 powders on different substrates, maintained at different temperatures, and also by reactive magnetron sputtering of a Re metallic target. A comparative investigation has been carried out on these films, by using micro-Raman spectroscopy and x-ray diffraction. Two basic types of solid phases appear to grow in the films: a red metallic HxReO3 compound, with distorted perovskite structures, like in the bulk material, and ordered HReO4 crystals based on tetrahedral perrhenate ions. Because of its conduction properties, the electrical and electro-optical behaviors of ReO3 films deposited on standard indium tin oxide/glass substrate have been tested inside asymmetric nematic liquid crystal cells, showing an appreciable capability of rectification of their electro-optical response, in similar way to tungsten trioxide.

  16. Platinum-, rhenium-, indium-containing catalysts for conversion of hydrocarbons

    SciTech Connect

    Antos, G.J.; Wang, L.

    1986-12-16

    A process is described for the catalytic reforming of naphtha-boiling range charge stock at reforming conditions with a catalytic composite comprising: (a) a refractory inorganic oxide; (b) a first uniform dispersion of a platinum component and a rhenium component; (c) a second dispersion of an indium component thereover; (d) a halogen component; and (e) a sulfur component.

  17. Discovery of tantalum, rhenium, osmium, and iridium isotopes

    SciTech Connect

    Robinson, R.; Thoennessen, M.

    2012-09-15

    Currently, thirty-eight tantalum, thirty-eight rhenium, thirty-nine osmium, and thirty-eight iridium isotopes have been observed and the discovery of these isotopes is described here. For each isotope a brief synopsis of the first refereed publication, including the production and identification method, is presented.

  18. Rhenium(I)-based Double-heterostranded Helicates.

    PubMed

    Saxena, Priya; Shankar, Bhaskaran; Sathyanarayana, Arruri; Prabusankar, Ganesan; Sathiyendiran, Malaichamy

    2015-01-01

    Rhenium(I)-based supramolecular coordination complexes were obtained using Re2(CO)10, (2-hydroxyphenyl)benzimidazole-derived bis-chelating N∩O donors and a benzimidazolyl-derived ditopic monodentate N-donor possessing Troger's base spacer in a one-pot approach.

  19. Diffusion aluminide coatings for internal surface of rhenium- and rhenium-ruthenium-containing single-crystal superalloys turbine blades: Part I

    NASA Astrophysics Data System (ADS)

    Mubovadzhyan, S. A.; Galoyan, A. G.

    2012-09-01

    Process of formation rhenium or refractory carbides based diffusion barrier layer (coating) on internal surface of rhenium- and rhenium-ruthenium-containing single-crystal high-temperature alloys (superalloy) turbine blades, prior to diffusion aluminide coating deposition, is studied. It is shown that diffusion barrier layer is preventing deleterious secondary reaction zone formation under aluminide coating during long-term high-temperature operation. The kinetics of powder carburizing process of rhenium- and rhenium-ruthenium-containing high-temperature alloys is investigated, and conditions for carburizing these alloys are determined. The phase composition of the surface layer after carburizing is studied, and the effect of the fractional composition of a carbon-based powder mixture on the carburizing rate is determined.

  20. Combination of three metals for the treatment of cancer: gallium, rhenium and platinum. 1. Determination of the optimal schedule of treatment.

    PubMed

    Collery, Philippe; Mohsen, Ahmed; Kermagoret, Anthony; D'Angelo, Jean; Morgant, Georges; Desmaele, Didier; Tomas, Alain; Collery, Thomas; Wei, Ming; Badawi, Abdelfattah

    2012-07-01

    Platinum is well known for its anticancer activity, firstly used as cis-diaminedichloroplatinum (II) (CDDP), with a wide range of activity. Its main mechanism of action involves its binding to DNA. Gallium, another metal, has also demonstrated apoptotic effects on malignant cells, but through interaction with targets other than DNA, such as the membrane, cytoskeleton and proteasome, and on enzyme activities. An antitumor synergism between CDDP and both gallium and rhenium compounds has been demonstrated. For these reasons, we proposed to combine these three metals and to determine at which doses each compound could be administered without major toxicity. CDDP, tetrakis(1-octanol) tris(5-aminosalicylate)gallium(III), and a diseleno-ether rhenium(I) complex were used in this experimental study in breast cancer MCF-7 tumor-bearing mice. CDDP was administered intraperitoneally (i.p.) twice a week at the dose of 3 mg/kg. Tetrakis(1-octanol) tris(5-aminosalicylate) gallium (III) and rhenium(I) diseleno-ether complexes were administered orally, daily, five days a week for three weeks, at doses ranging from 20 to 100 mg/kg for the gallium compound and from 10 to 50 mg/kg for the rhenium compound. Doses of 10 mg/kg of rhenium(I) diseleno-ether, and 100 mg/kg of the salicylate gallium compound, in combination with CDDP induced a significant decrease of 50% of the tumor volume, by comparison with the control group. In contrast, the decrease of the tumor volume in mice treated by CDDP alone was less than 25%. Changes in the sequence of administration of the three metals will be discussed to improve the therapeutic index.

  1. Supported rhenium complexes: almost uniform rhenium tricarbonyls synthesized from CH3Re(CO)5 and HY zeolite.

    PubMed

    Lobo-Lapidus, Rodrigo J; Gates, Bruce C

    2010-11-02

    Supported rhenium complexes were prepared from CH(3)Re(CO)(5) and dealuminated HY zeolite or NaY zeolite, each with a Si/Al atomic ratio of 30. The samples were characterized with infrared (IR) and extended X-ray absorption fine structure (EXAFS) spectroscopies. EXAFS data characterizing the sample formed by the reaction of CH(3)Re(CO)(5) with dealuminated HY zeolite show that the rhenium complexes were bonded to the zeolite frame, incorporating, on average, three carbonyl ligands per Re atom (as shown by Re-C and multiple-scattering Re-O EXAFS contributions). The IR spectra, consistent with this result, show that the supported rhenium carbonyls were bonded near aluminum sites of the zeolite, as shown by the decrease in intensity of the IR bands characterizing the acidic silanol groups resulting from the reaction of the rhenium carbonyl with the zeolite. This supported metal complex was characterized by narrow peaks in the ν(CO) region of the IR spectrum, indicating highly uniform species. In contrast, the species formed from CH(3)Re(CO)(5) on NaY zeolite lost fewer carbonyl ligands than those formed on HY zeolite and were significantly less uniform, as indicated by the greater breadth of the ν(CO) bands in the IR spectra. The results show the importance of zeolite H(+) sites for the formation of uniform supported rhenium carbonyls from CH(3)Re(CO)(5); the formation of such uniform complexes did not occur on the NaY zeolite.

  2. 40 CFR 61.185 - Recordkeeping requirements.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ... Arsenic Emissions From Arsenic Trioxide and Metallic Arsenic Production Facilities § 61.185 Recordkeeping... arsenic to the atmosphere between the time of discovery and the time corrective action was taken. (c) Each... ambient inorganic arsenic concentrations at all sampling sites and other data needed to determine...

  3. 40 CFR 61.185 - Recordkeeping requirements.

    Code of Federal Regulations, 2014 CFR

    2014-07-01

    ... Arsenic Emissions From Arsenic Trioxide and Metallic Arsenic Production Facilities § 61.185 Recordkeeping... arsenic to the atmosphere between the time of discovery and the time corrective action was taken. (c) Each... ambient inorganic arsenic concentrations at all sampling sites and other data needed to determine...

  4. 40 CFR 61.185 - Recordkeeping requirements.

    Code of Federal Regulations, 2013 CFR

    2013-07-01

    ... Arsenic Emissions From Arsenic Trioxide and Metallic Arsenic Production Facilities § 61.185 Recordkeeping... arsenic to the atmosphere between the time of discovery and the time corrective action was taken. (c) Each... ambient inorganic arsenic concentrations at all sampling sites and other data needed to determine...

  5. 40 CFR 61.185 - Recordkeeping requirements.

    Code of Federal Regulations, 2011 CFR

    2011-07-01

    ... Arsenic Emissions From Arsenic Trioxide and Metallic Arsenic Production Facilities § 61.185 Recordkeeping... arsenic to the atmosphere between the time of discovery and the time corrective action was taken. (c) Each... ambient inorganic arsenic concentrations at all sampling sites and other data needed to determine...

  6. 40 CFR 61.185 - Recordkeeping requirements.

    Code of Federal Regulations, 2012 CFR

    2012-07-01

    ... Arsenic Emissions From Arsenic Trioxide and Metallic Arsenic Production Facilities § 61.185 Recordkeeping... arsenic to the atmosphere between the time of discovery and the time corrective action was taken. (c) Each... ambient inorganic arsenic concentrations at all sampling sites and other data needed to determine...

  7. 46 CFR 185.726 - Annual inspections.

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    ...) OPERATIONS Operational Readiness, Maintenance, and Inspection of Lifesaving Equipment § 185.726 Annual.... (d) Each battery used in an item of lifesaving equipment, except inflatable survival craft equipment, must be replaced during the annual inspection if the expiration date of the battery has passed....

  8. 32 CFR 185.1 - Purpose.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ... any national security emergency. 3 See footnote 2 to § 185.1(a). (c) Constitutes a single system for... civil emergencies requiring Federal response, or attacks, including national security emergencies as... programs, in cooperation with the Federal Emergency Management Agency (FEMA), under the authority of...

  9. 32 CFR 185.4 - Policy.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ... the Secretary of Defense. In that capacity, the DoD Executive Agent will develop planning guidance... (MSCA) § 185.4 Policy. (a) National policy. (1) Planning and preparedness by the Federal Government for... during any national security emergency. (b) Scope. This part governs all planning and response by...

  10. Rhenium and Molybdenum in Rivers and Estuaries.

    NASA Astrophysics Data System (ADS)

    Walker, B. D.; Peucker-Ehrenbrink, B.

    2004-12-01

    Due to their redox-sensitive nature, the geochemical cycles of Re and Mo are linked to the global organic carbon cycle. Reducing sediments constitute a globally important sink and weathering of organic-rich sediments is responsible for a large portion of the Re and - to a lesser extent - Mo flux to the oceans (Colodner et al., 1993; Jaffe et al., 2002). Riverine concentrations of Re and Mo are a function of the river basin lithology, but are also likely to be affected by anthropogenic contributions (Colodner et al., 1995). Current estimates of global natural riverine Re flux are restricted to single analyses of four major rivers, which characterize only 23%\\ of the global freshwater flux (Colodner et al., 1993). Annual variability of Re and Mo concentrations in rivers has not been studied. A single study of Re concentrations along the salinity gradient of the Amazon shelf is suggestive of conservative mixing, but scatter in the data do not allow to exclude the possibility of Re addition in the low-salinity end of the profile (Colodner et al., 1993). Careful evaluation of samples from the Hudson River estuary using a variety of extraction techniques indicates that spike-sample equilibration was not fully achieved using commonly used methods. We have therefore developed a simple, clean and efficient method of extracting Re from filtered water samples. Our method utilizes syringe filtration, prolonged heating to achieve spike-sample equilibration, batch equilibration with TEVA resin, and extraction of Re and Mo using syringe filtration. Rhenium concentrations in the Hudson, Housatonic and Connecticut rivers are 38 pM, 6.6 pM and 14 pM, respectively, much higher than the estimated global average of 2.1 pM (Colodner et al., 1993). Molybdenum concentrations are 4.6 nM, 5.5 nM, 7.8 nM, respectively. These rivers drain basins of Precambrian basement as well as predominantly Paleozoic sediments and have been substantially urbanized. Data for a salinity profile along the

  11. Necroptosis-inducing rhenium(V) oxo complexes.

    PubMed

    Suntharalingam, Kogularamanan; Awuah, Samuel G; Bruno, Peter M; Johnstone, Timothy C; Wang, Fang; Lin, Wei; Zheng, Yao-Rong; Page, Julia E; Hemann, Michael T; Lippard, Stephen J

    2015-03-04

    Rhenium(V) oxo complexes of general formula [ReO(OMe)(N^N)Cl2], where N^N = 4,7-diphenyl-1,10-phenanthroline, 1, or 3,4,7,8-tetramethyl-1,10-phenanthroline, 2, effectively kill cancer cells by triggering necroptosis, a non-apoptotic form of cell death. Both complexes evoke necrosome (RIP1-RIP3)-dependent intracellular reactive oxygen species (ROS) production and propidium iodide uptake. The complexes also induce mitochondrial membrane potential depletion, a possible downstream effect of ROS production. Apparently, 1 and 2 are the first rhenium complexes to evoke cellular events consistent with programmed necrosis in cancer cells. Furthermore, 1 and 2 display low acute toxicity in C57BL/6 mice and reasonable stability in fresh human blood.

  12. CVD Rhenium Engines for Solar-Thermal Propulsion Systems

    NASA Technical Reports Server (NTRS)

    Williams, Brian E.; Fortini, Arthur J.; Tuffias, Robert H.; Duffy, Andrew J.; Tucker, Stephen P.

    1999-01-01

    Solar-thermal upper-stage propulsion systems have the potential to provide specific impulse approaching 900 seconds, with 760 seconds already demonstrated in ground testing. Such performance levels offer a 100% increase in payload capability compared to state-of-the-art chemical upper-stage systems, at lower cost. Although alternatives such as electric propulsion offer even greater performance, the 6- to 18- month orbital transfer time is a far greater deviation from the state of the art than the one to two months required for solar propulsion. Rhenium metal is the only material that is capable of withstanding the predicted thermal, mechanical, and chemical environment of a solar-thermal propulsion device. Chemical vapor deposition (CVD) is the most well-established and cost-effective process for the fabrication of complex rhenium structures. CVD rhenium engines have been successfully constructed for the Air Force ISUS program (bimodal thrust/electricity) and the NASA Shooting Star program (thrust only), as well as under an Air Force SBIR project (thrust only). The bimodal engine represents a more long-term and versatile approach to solar-thermal propulsion, while the thrust-only engines provide a potentially lower weight/lower cost and more near-term replacement for current upper-stage propulsion systems.

  13. [X-ray fluorescence spectrometric determination of high rhenium content in rhenium-tungsten alloys used in traveling wave tube].

    PubMed

    Bao, Sheng-xiang; Wang, Shou-xu; Ma, Li-li; Zhao, Deng-hua; Fan, Rong-kui; Li, Jian

    2005-03-01

    The matrix effect, spectral overlap and background were investigated for X-ray fluorescence (XRF) spectrometric determination of rhenium content according to the analysis requirement of rhenium-tungsten alloys, a key material used in traveling wave tube. The reason for causing the calibration curve nonlinear was explained theoretically when binary ratio technique of XRF was used. Both theoretical and experimental results show that linear calibration curve can be obtained if the curve is plotted by Re% vs. Re Lalpha X-ray intensity instead of binary ratio technique. The method is rapid and accurate and the results obtained in this work are in good agreement with those of chemical analysis. The method has been successfully applied to product quality control.

  14. Rhenium Complexes and Clusters Supported on c-Al2O3: Effects of Rhenium Oxidation State and Rhenium Cluster Size on Catalytic Activity for n-butane Hydrogenolysis

    SciTech Connect

    Lobo Lapidus, R.; Gates, B

    2009-01-01

    Supported metals prepared from H{sub 3}Re{sub 3}(CO){sub 12} on {gamma}-Al{sub 2}O{sub 3} were treated under conditions that led to various rhenium structures on the support and were tested as catalysts for n-butane conversion in the presence of H{sub 2} in a flow reactor at 533 K and 1 atm. After use, two samples were characterized by X-ray absorption edge positions of approximately 5.6 eV (relative to rhenium metal), indicating that the rhenium was cationic and essentially in the same average oxidation state in each. But the Re-Re coordination numbers found by extended X-ray absorption fine structure spectroscopy (2.2 and 5.1) show that the clusters in the two samples were significantly different in average nuclearity despite their indistinguishable rhenium oxidation states. Spectra of a third sample after catalysis indicate approximately Re{sub 3} clusters, on average, and an edge position of 4.5 eV. Thus, two samples contained clusters approximated as Re{sub 3} (on the basis of the Re-Re coordination number), on average, with different average rhenium oxidation states. The data allow resolution of the effects of rhenium oxidation state and cluster size, both of which affect the catalytic activity; larger clusters and a greater degree of reduction lead to increased activity.

  15. enantio-Enriched CPL-active helicene-bipyridine-rhenium complexes.

    PubMed

    Saleh, Nidal; Srebro, Monika; Reynaldo, Thibault; Vanthuyne, Nicolas; Toupet, Loïc; Chang, Victoria Y; Muller, Gilles; Williams, J A Gareth; Roussel, Christian; Autschbach, Jochen; Crassous, Jeanne

    2015-03-04

    The incorporation of a rhenium atom within an extended helical π-conjugated bi-pyridine system impacts the chiroptical and photophysical properties of the resulting neutral or cationic complexes, leading to the first examples of rhenium-based phosphors that exhibit circularly polarized luminescence.

  16. Atom Probe Tomography Analysis of the Distribution of Rhenium in Nickel Alloys

    SciTech Connect

    Mottura, A.; Warnken, N; Miller, Michael K; Reed, R. C.; Finnis, M.

    2010-01-01

    Atom probe tomography (APT) is used to characterise the distributions of rhenium in a binary Ni-Re alloy and the nickel-based single-crystal CMSX-4 superalloy. A purpose-built algorithm is developed to quantify the size distribution of solute clusters, and applied to the APT datasets to critique the hypothesis that rhenium is prone to the formation of clusters in these systems. No evidence is found to indicate that rhenium forms solute clusters above the level expected from random fluctuations. In CMSX-4, enrichment of Re is detected in the matrix phase close to the matrix/precipitate ({gamma}/{gamma}{prime}) phase boundaries. Phase field modelling indicates that this is due to the migration of the {gamma}/{gamma}{prime} interface during cooling from the temperature of operation. Thus, neither clustering of rhenium nor interface enrichments can be the cause of the enhancement in high temperature mechanical properties conferred by rhenium alloying.

  17. Catalytic Activity of Platinum Monolayer on Iridium and Rhenium Alloy Nanoparticles for the Oxygen Reduction Reaction

    SciTech Connect

    Karan, Hiroko I.; Sasaki, Kotaro; Kuttiyiel, Kurian; Farberow, Carrie A.; Mavrikakis, Manos; Adzic, Radoslav R.

    2012-05-04

    A new type of electrocatalyst with a core–shell structure that consists of a platinum monolayer shell placed on an iridium–rhenium nanoparticle core or platinum and palladium bilayer shell deposited on that core has been prepared and tested for electrocatalytic activity for the oxygen reduction reaction. Carbon-supported iridium–rhenium alloy nanoparticles with several different molar ratios of Ir to Re were prepared by reducing metal chlorides dispersed on Vulcan carbon with hydrogen gas at 400 °C for 1 h. These catalysts showed specific electrocatalytic activity for oxygen reduction reaction comparable to that of platinum. The activities of PtML/PdML/Ir2Re1, PtML/Pd2layers/Ir2Re1, and PtML/Pd2layers/Ir7Re3 catalysts were, in fact, better than that of conventional platinum electrocatalysts, and their mass activities exceeded the 2015 DOE target. Our density functional theory calculations revealed that the molar ratio of Ir to Re affects the binding strength of adsorbed OH and, thereby, the O2 reduction activity of the catalysts. The maximum specific activity was found for an intermediate OH binding energy with the corresponding catalyst on the top of the volcano plot. The monolayer concept facilitates the use of much less platinum than in other approaches. Finally, the results with the PtML/PdML/Ir2Re electrocatalyst indicate that it is a promising alternative to conventional Pt electrocatalysts in low-temperature fuel cells.

  18. Intraarterial irradiation with rhenium-188 for inhibition of restenosis after PTCA - strategy and evaluation of Re-188-species for rapid urinary excretion

    SciTech Connect

    Knapp, F.F. Jr.; Guhlke, S.; Beets, A.L.

    1997-05-01

    Estimated costs for coronary restenosis therapy after PTCA are > $ 1 billion (U.S.). Radiation is a simple and effective tool for inhibition of neointimal proliferation an important component of restenosis. We propose use of Re-188 (t{sub {1/2}} 16.9 h, 2.1 MeV {beta}), obtained from decay of W-188 (T{sub {1/2}} 69 d). Our alumina-based W-188/Re-188 generator has a shelf-life of several months and we have developed an on-line tandem cation/anion exchange column system to concentrate to > 18.5 BGq/mL. Estimates for targeted regional dose of 8.4 rad/37 MBq/min/mL, which is > 1,400 cGy for about 370 MBq Re-188 for 5 min. Balloon inflation with Re-188 solutions is a new approach for more uniform vascular dose distribution as an alternative to use of radioactive wires or other linear sources. Rapid urinary excretion kinetics are important in the unlikely event of balloon rupture (<0.1%). We have therefore evaluated relative excretion kinetics of Re-188-perrhenate and -MAG3 in rats; Re-188-perrhenate was obtained from generator elution with 0.9% NaCl and re-188-MAG3 was prepared be reaction of the ligand with Sn(II)-reduced perrhenate. Fischer rats (n=4-5/group) were injected i.v. and urine and feces collected every 2 h for 12 h and then daily for 5 d. Both agents excreted > 90% in urine; biodistribution studies showed low organ uptake with intestines as the major site. Rhenium-188-MAG3 excreted more rapidly (2 h = 59.6{+-}18.5%) then Re-188-MAG3 excreted more rapidly (2 h = 68.3{+-}13.5%) in same model. Both Re-188 species are thus good candidates for balloon inflation. Studies are in progress in a swine model to evaluate the effectiveness of Re-188 for inhibition of restenosis.

  19. 46 CFR 185.506 - Passenger safety orientation.

    Code of Federal Regulations, 2012 CFR

    2012-10-01

    ... 46 Shipping 7 2012-10-01 2012-10-01 false Passenger safety orientation. 185.506 Section 185.506... TONS) OPERATIONS Preparations for Emergencies § 185.506 Passenger safety orientation. (a) Except as... informed of the required safety information. (e) On a vessel on a voyage of more than 24 hours...

  20. 46 CFR 172.185 - Permeability of spaces.

    Code of Federal Regulations, 2012 CFR

    2012-10-01

    ... 46 Shipping 7 2012-10-01 2012-10-01 false Permeability of spaces. 172.185 Section 172.185 Shipping... Under Subchapter O of This Chapter § 172.185 Permeability of spaces. (a) When doing the calculations required in § 172.170, the permeability of a floodable space other than a machinery space must be as...

  1. 46 CFR 172.185 - Permeability of spaces.

    Code of Federal Regulations, 2013 CFR

    2013-10-01

    ... 46 Shipping 7 2013-10-01 2013-10-01 false Permeability of spaces. 172.185 Section 172.185 Shipping... Under Subchapter O of This Chapter § 172.185 Permeability of spaces. (a) When doing the calculations required in § 172.170, the permeability of a floodable space other than a machinery space must be as...

  2. 46 CFR 172.185 - Permeability of spaces.

    Code of Federal Regulations, 2014 CFR

    2014-10-01

    ... 46 Shipping 7 2014-10-01 2014-10-01 false Permeability of spaces. 172.185 Section 172.185 Shipping... Under Subchapter O of This Chapter § 172.185 Permeability of spaces. (a) When doing the calculations required in § 172.170, the permeability of a floodable space other than a machinery space must be as...

  3. 32 CFR 185.2 - Applicability and scope.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ... 32 National Defense 1 2010-07-01 2010-07-01 false Applicability and scope. 185.2 Section 185.2 National Defense Department of Defense OFFICE OF THE SECRETARY OF DEFENSE CIVIL DEFENSE MILITARY SUPPORT TO CIVIL AUTHORITIES (MSCA) § 185.2 Applicability and scope. This part: (a) Applies to the Office of...

  4. 46 CFR 185.524 - Fire fighting drills and training.

    Code of Federal Regulations, 2014 CFR

    2014-10-01

    ... 46 Shipping 7 2014-10-01 2014-10-01 false Fire fighting drills and training. 185.524 Section 185... 100 GROSS TONS) OPERATIONS Preparations for Emergencies § 185.524 Fire fighting drills and training. (a) The master shall conduct sufficient fire drills to make sure that each crew member is...

  5. 46 CFR 185.524 - Fire fighting drills and training.

    Code of Federal Regulations, 2013 CFR

    2013-10-01

    ... 46 Shipping 7 2013-10-01 2013-10-01 false Fire fighting drills and training. 185.524 Section 185... 100 GROSS TONS) OPERATIONS Preparations for Emergencies § 185.524 Fire fighting drills and training. (a) The master shall conduct sufficient fire drills to make sure that each crew member is...

  6. 46 CFR 185.524 - Fire fighting drills and training.

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    ... 46 Shipping 7 2010-10-01 2010-10-01 false Fire fighting drills and training. 185.524 Section 185... 100 GROSS TONS) OPERATIONS Preparations for Emergencies § 185.524 Fire fighting drills and training. (a) The master shall conduct sufficient fire drills to make sure that each crew member is...

  7. 46 CFR 185.524 - Fire fighting drills and training.

    Code of Federal Regulations, 2011 CFR

    2011-10-01

    ... 46 Shipping 7 2011-10-01 2011-10-01 false Fire fighting drills and training. 185.524 Section 185... 100 GROSS TONS) OPERATIONS Preparations for Emergencies § 185.524 Fire fighting drills and training. (a) The master shall conduct sufficient fire drills to make sure that each crew member is...

  8. 46 CFR 185.524 - Fire fighting drills and training.

    Code of Federal Regulations, 2012 CFR

    2012-10-01

    ... 46 Shipping 7 2012-10-01 2012-10-01 false Fire fighting drills and training. 185.524 Section 185... 100 GROSS TONS) OPERATIONS Preparations for Emergencies § 185.524 Fire fighting drills and training. (a) The master shall conduct sufficient fire drills to make sure that each crew member is...

  9. 21 CFR 73.185 - Haematococcus algae meal.

    Code of Federal Regulations, 2014 CFR

    2014-04-01

    ... 21 Food and Drugs 1 2014-04-01 2014-04-01 false Haematococcus algae meal. 73.185 Section 73.185... COLOR ADDITIVES EXEMPT FROM CERTIFICATION Foods § 73.185 Haematococcus algae meal. (a) Identity. (1) The color additive haematococcus algae meal consists of the comminuted and dried cells of the...

  10. 21 CFR 73.185 - Haematococcus algae meal.

    Code of Federal Regulations, 2011 CFR

    2011-04-01

    ... 21 Food and Drugs 1 2011-04-01 2011-04-01 false Haematococcus algae meal. 73.185 Section 73.185... COLOR ADDITIVES EXEMPT FROM CERTIFICATION Foods § 73.185 Haematococcus algae meal. (a) Identity. (1) The color additive haematococcus algae meal consists of the comminuted and dried cells of the...

  11. 21 CFR 73.185 - Haematococcus algae meal.

    Code of Federal Regulations, 2013 CFR

    2013-04-01

    ... 21 Food and Drugs 1 2013-04-01 2013-04-01 false Haematococcus algae meal. 73.185 Section 73.185... COLOR ADDITIVES EXEMPT FROM CERTIFICATION Foods § 73.185 Haematococcus algae meal. (a) Identity. (1) The color additive haematococcus algae meal consists of the comminuted and dried cells of the...

  12. 21 CFR 73.185 - Haematococcus algae meal.

    Code of Federal Regulations, 2010 CFR

    2010-04-01

    ... 21 Food and Drugs 1 2010-04-01 2010-04-01 false Haematococcus algae meal. 73.185 Section 73.185... COLOR ADDITIVES EXEMPT FROM CERTIFICATION Foods § 73.185 Haematococcus algae meal. (a) Identity. (1) The color additive haematococcus algae meal consists of the comminuted and dried cells of the...

  13. 21 CFR 73.185 - Haematococcus algae meal.

    Code of Federal Regulations, 2012 CFR

    2012-04-01

    ... 21 Food and Drugs 1 2012-04-01 2012-04-01 false Haematococcus algae meal. 73.185 Section 73.185... COLOR ADDITIVES EXEMPT FROM CERTIFICATION Foods § 73.185 Haematococcus algae meal. (a) Identity. (1) The color additive haematococcus algae meal consists of the comminuted and dried cells of the...

  14. 46 CFR 185.508 - Wearing of life jackets.

    Code of Federal Regulations, 2011 CFR

    2011-10-01

    ... 46 Shipping 7 2011-10-01 2011-10-01 false Wearing of life jackets. 185.508 Section 185.508... TONS) OPERATIONS Preparations for Emergencies § 185.508 Wearing of life jackets. (a) The master of a vessel shall require passengers to don life jackets when possible hazardous conditions exist,...

  15. 46 CFR 185.516 - Life jacket placards.

    Code of Federal Regulations, 2011 CFR

    2011-10-01

    ... 46 Shipping 7 2011-10-01 2011-10-01 false Life jacket placards. 185.516 Section 185.516 Shipping...) OPERATIONS Preparations for Emergencies § 185.516 Life jacket placards. (a) Placards containing instructions for the donning and use of the life jackets aboard the vessel must be posted in conspicuous...

  16. 46 CFR 185.516 - Life jacket placards.

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    ... 46 Shipping 7 2010-10-01 2010-10-01 false Life jacket placards. 185.516 Section 185.516 Shipping...) OPERATIONS Preparations for Emergencies § 185.516 Life jacket placards. (a) Placards containing instructions for the donning and use of the life jackets aboard the vessel must be posted in conspicuous...

  17. 46 CFR 185.516 - Life jacket placards.

    Code of Federal Regulations, 2013 CFR

    2013-10-01

    ... 46 Shipping 7 2013-10-01 2013-10-01 false Life jacket placards. 185.516 Section 185.516 Shipping...) OPERATIONS Preparations for Emergencies § 185.516 Life jacket placards. (a) Placards containing instructions for the donning and use of the life jackets aboard the vessel must be posted in conspicuous...

  18. 46 CFR 185.508 - Wearing of life jackets.

    Code of Federal Regulations, 2012 CFR

    2012-10-01

    ... 46 Shipping 7 2012-10-01 2012-10-01 false Wearing of life jackets. 185.508 Section 185.508... TONS) OPERATIONS Preparations for Emergencies § 185.508 Wearing of life jackets. (a) The master of a vessel shall require passengers to don life jackets when possible hazardous conditions exist,...

  19. 46 CFR 185.516 - Life jacket placards.

    Code of Federal Regulations, 2014 CFR

    2014-10-01

    ... 46 Shipping 7 2014-10-01 2014-10-01 false Life jacket placards. 185.516 Section 185.516 Shipping...) OPERATIONS Preparations for Emergencies § 185.516 Life jacket placards. (a) Placards containing instructions for the donning and use of the life jackets aboard the vessel must be posted in conspicuous...

  20. 46 CFR 185.516 - Life jacket placards.

    Code of Federal Regulations, 2012 CFR

    2012-10-01

    ... 46 Shipping 7 2012-10-01 2012-10-01 false Life jacket placards. 185.516 Section 185.516 Shipping...) OPERATIONS Preparations for Emergencies § 185.516 Life jacket placards. (a) Placards containing instructions for the donning and use of the life jackets aboard the vessel must be posted in conspicuous...

  1. 5 CFR 185.115 - Separation of functions.

    Code of Federal Regulations, 2013 CFR

    2013-01-01

    ... 5 Administrative Personnel 1 2013-01-01 2013-01-01 false Separation of functions. 185.115 Section 185.115 Administrative Personnel OFFICE OF PERSONNEL MANAGEMENT CIVIL SERVICE REGULATIONS PROGRAM FRAUD CIVIL REMEDIES § 185.115 Separation of functions. (a) The investigating official, the...

  2. 5 CFR 185.115 - Separation of functions.

    Code of Federal Regulations, 2011 CFR

    2011-01-01

    ... 5 Administrative Personnel 1 2011-01-01 2011-01-01 false Separation of functions. 185.115 Section 185.115 Administrative Personnel OFFICE OF PERSONNEL MANAGEMENT CIVIL SERVICE REGULATIONS PROGRAM FRAUD CIVIL REMEDIES § 185.115 Separation of functions. (a) The investigating official, the...

  3. 5 CFR 185.115 - Separation of functions.

    Code of Federal Regulations, 2010 CFR

    2010-01-01

    ... 5 Administrative Personnel 1 2010-01-01 2010-01-01 false Separation of functions. 185.115 Section 185.115 Administrative Personnel OFFICE OF PERSONNEL MANAGEMENT CIVIL SERVICE REGULATIONS PROGRAM FRAUD CIVIL REMEDIES § 185.115 Separation of functions. (a) The investigating official, the...

  4. 5 CFR 185.115 - Separation of functions.

    Code of Federal Regulations, 2012 CFR

    2012-01-01

    ... 5 Administrative Personnel 1 2012-01-01 2012-01-01 false Separation of functions. 185.115 Section 185.115 Administrative Personnel OFFICE OF PERSONNEL MANAGEMENT CIVIL SERVICE REGULATIONS PROGRAM FRAUD CIVIL REMEDIES § 185.115 Separation of functions. (a) The investigating official, the...

  5. 5 CFR 185.115 - Separation of functions.

    Code of Federal Regulations, 2014 CFR

    2014-01-01

    ... 5 Administrative Personnel 1 2014-01-01 2014-01-01 false Separation of functions. 185.115 Section 185.115 Administrative Personnel OFFICE OF PERSONNEL MANAGEMENT CIVIL SERVICE REGULATIONS PROGRAM FRAUD CIVIL REMEDIES § 185.115 Separation of functions. (a) The investigating official, the...

  6. 46 CFR 185.910 - Suspension and revocation.

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    ... 46 Shipping 7 2010-10-01 2010-10-01 false Suspension and revocation. 185.910 Section 185.910... TONS) OPERATIONS Penalties § 185.910 Suspension and revocation. An individual holding a merchant... of 46 U.S.C. 7703 and part 5 of this chapter with respect to suspension or revocation of a...

  7. 46 CFR 185.206 - Written report of marine casualty.

    Code of Federal Regulations, 2011 CFR

    2011-10-01

    ... 46 Shipping 7 2011-10-01 2011-10-01 false Written report of marine casualty. 185.206 Section 185... 100 GROSS TONS) OPERATIONS Marine Casualties and Voyage Records § 185.206 Written report of marine... of any marine casualty. This written report is in addition to the immediate notice required by...

  8. 46 CFR 185.206 - Written report of marine casualty.

    Code of Federal Regulations, 2013 CFR

    2013-10-01

    ... 46 Shipping 7 2013-10-01 2013-10-01 false Written report of marine casualty. 185.206 Section 185... 100 GROSS TONS) OPERATIONS Marine Casualties and Voyage Records § 185.206 Written report of marine... of any marine casualty. This written report is in addition to the immediate notice required by...

  9. 46 CFR 185.206 - Written report of marine casualty.

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    ... 46 Shipping 7 2010-10-01 2010-10-01 false Written report of marine casualty. 185.206 Section 185... 100 GROSS TONS) OPERATIONS Marine Casualties and Voyage Records § 185.206 Written report of marine... of any marine casualty. This written report is in addition to the immediate notice required by...

  10. 46 CFR 185.206 - Written report of marine casualty.

    Code of Federal Regulations, 2012 CFR

    2012-10-01

    ... 46 Shipping 7 2012-10-01 2012-10-01 false Written report of marine casualty. 185.206 Section 185... 100 GROSS TONS) OPERATIONS Marine Casualties and Voyage Records § 185.206 Written report of marine... of any marine casualty. This written report is in addition to the immediate notice required by...

  11. 46 CFR 185.206 - Written report of marine casualty.

    Code of Federal Regulations, 2014 CFR

    2014-10-01

    ... 46 Shipping 7 2014-10-01 2014-10-01 false Written report of marine casualty. 185.206 Section 185... 100 GROSS TONS) OPERATIONS Marine Casualties and Voyage Records § 185.206 Written report of marine... of any marine casualty. This written report is in addition to the immediate notice required by...

  12. 46 CFR 185.608 - Fuel shutoff valves.

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    ... 46 Shipping 7 2010-10-01 2010-10-01 false Fuel shutoff valves. 185.608 Section 185.608 Shipping COAST GUARD, DEPARTMENT OF HOMELAND SECURITY (CONTINUED) SMALL PASSENGER VESSELS (UNDER 100 GROSS TONS) OPERATIONS Markings Required § 185.608 Fuel shutoff valves. Remote fuel shutoff stations must be marked...

  13. 46 CFR 185.608 - Fuel shutoff valves.

    Code of Federal Regulations, 2013 CFR

    2013-10-01

    ... 46 Shipping 7 2013-10-01 2013-10-01 false Fuel shutoff valves. 185.608 Section 185.608 Shipping COAST GUARD, DEPARTMENT OF HOMELAND SECURITY (CONTINUED) SMALL PASSENGER VESSELS (UNDER 100 GROSS TONS) OPERATIONS Markings Required § 185.608 Fuel shutoff valves. Remote fuel shutoff stations must be marked...

  14. 46 CFR 185.608 - Fuel shutoff valves.

    Code of Federal Regulations, 2011 CFR

    2011-10-01

    ... 46 Shipping 7 2011-10-01 2011-10-01 false Fuel shutoff valves. 185.608 Section 185.608 Shipping COAST GUARD, DEPARTMENT OF HOMELAND SECURITY (CONTINUED) SMALL PASSENGER VESSELS (UNDER 100 GROSS TONS) OPERATIONS Markings Required § 185.608 Fuel shutoff valves. Remote fuel shutoff stations must be marked...

  15. 46 CFR 185.360 - Use of auto pilot.

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    ... 46 Shipping 7 2010-10-01 2010-10-01 false Use of auto pilot. 185.360 Section 185.360 Shipping COAST GUARD, DEPARTMENT OF HOMELAND SECURITY (CONTINUED) SMALL PASSENGER VESSELS (UNDER 100 GROSS TONS) OPERATIONS Miscellaneous Operating Requirements § 185.360 Use of auto pilot. Whenever an automatic pilot...

  16. 46 CFR 185.208 - Accidents to machinery.

    Code of Federal Regulations, 2013 CFR

    2013-10-01

    ... 46 Shipping 7 2013-10-01 2013-10-01 false Accidents to machinery. 185.208 Section 185.208 Shipping COAST GUARD, DEPARTMENT OF HOMELAND SECURITY (CONTINUED) SMALL PASSENGER VESSELS (UNDER 100 GROSS TONS) OPERATIONS Marine Casualties and Voyage Records § 185.208 Accidents to machinery. The owner,...

  17. 46 CFR 185.208 - Accidents to machinery.

    Code of Federal Regulations, 2014 CFR

    2014-10-01

    ... 46 Shipping 7 2014-10-01 2014-10-01 false Accidents to machinery. 185.208 Section 185.208 Shipping COAST GUARD, DEPARTMENT OF HOMELAND SECURITY (CONTINUED) SMALL PASSENGER VESSELS (UNDER 100 GROSS TONS) OPERATIONS Marine Casualties and Voyage Records § 185.208 Accidents to machinery. The owner,...

  18. 46 CFR 185.208 - Accidents to machinery.

    Code of Federal Regulations, 2011 CFR

    2011-10-01

    ... 46 Shipping 7 2011-10-01 2011-10-01 false Accidents to machinery. 185.208 Section 185.208 Shipping COAST GUARD, DEPARTMENT OF HOMELAND SECURITY (CONTINUED) SMALL PASSENGER VESSELS (UNDER 100 GROSS TONS) OPERATIONS Marine Casualties and Voyage Records § 185.208 Accidents to machinery. The owner,...

  19. 46 CFR 185.208 - Accidents to machinery.

    Code of Federal Regulations, 2012 CFR

    2012-10-01

    ... 46 Shipping 7 2012-10-01 2012-10-01 false Accidents to machinery. 185.208 Section 185.208 Shipping COAST GUARD, DEPARTMENT OF HOMELAND SECURITY (CONTINUED) SMALL PASSENGER VESSELS (UNDER 100 GROSS TONS) OPERATIONS Marine Casualties and Voyage Records § 185.208 Accidents to machinery. The owner,...

  20. 46 CFR 185.208 - Accidents to machinery.

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    ... 46 Shipping 7 2010-10-01 2010-10-01 false Accidents to machinery. 185.208 Section 185.208 Shipping COAST GUARD, DEPARTMENT OF HOMELAND SECURITY (CONTINUED) SMALL PASSENGER VESSELS (UNDER 100 GROSS TONS) OPERATIONS Marine Casualties and Voyage Records § 185.208 Accidents to machinery. The owner,...

  1. 5 CFR 185.116 - Ex parte contacts.

    Code of Federal Regulations, 2012 CFR

    2012-01-01

    ... 5 Administrative Personnel 1 2012-01-01 2012-01-01 false Ex parte contacts. 185.116 Section 185.116 Administrative Personnel OFFICE OF PERSONNEL MANAGEMENT CIVIL SERVICE REGULATIONS PROGRAM FRAUD CIVIL REMEDIES § 185.116 Ex parte contacts. No party or person (except employees of the ALJ's...

  2. 5 CFR 185.116 - Ex parte contacts.

    Code of Federal Regulations, 2014 CFR

    2014-01-01

    ... 5 Administrative Personnel 1 2014-01-01 2014-01-01 false Ex parte contacts. 185.116 Section 185.116 Administrative Personnel OFFICE OF PERSONNEL MANAGEMENT CIVIL SERVICE REGULATIONS PROGRAM FRAUD CIVIL REMEDIES § 185.116 Ex parte contacts. No party or person (except employees of the ALJ's...

  3. 5 CFR 185.116 - Ex parte contacts.

    Code of Federal Regulations, 2011 CFR

    2011-01-01

    ... 5 Administrative Personnel 1 2011-01-01 2011-01-01 false Ex parte contacts. 185.116 Section 185.116 Administrative Personnel OFFICE OF PERSONNEL MANAGEMENT CIVIL SERVICE REGULATIONS PROGRAM FRAUD CIVIL REMEDIES § 185.116 Ex parte contacts. No party or person (except employees of the ALJ's...

  4. 5 CFR 185.116 - Ex parte contacts.

    Code of Federal Regulations, 2013 CFR

    2013-01-01

    ... 5 Administrative Personnel 1 2013-01-01 2013-01-01 false Ex parte contacts. 185.116 Section 185.116 Administrative Personnel OFFICE OF PERSONNEL MANAGEMENT CIVIL SERVICE REGULATIONS PROGRAM FRAUD CIVIL REMEDIES § 185.116 Ex parte contacts. No party or person (except employees of the ALJ's...

  5. 5 CFR 185.116 - Ex parte contacts.

    Code of Federal Regulations, 2010 CFR

    2010-01-01

    ... 5 Administrative Personnel 1 2010-01-01 2010-01-01 false Ex parte contacts. 185.116 Section 185.116 Administrative Personnel OFFICE OF PERSONNEL MANAGEMENT CIVIL SERVICE REGULATIONS PROGRAM FRAUD CIVIL REMEDIES § 185.116 Ex parte contacts. No party or person (except employees of the ALJ's...

  6. 46 CFR 185.608 - Fuel shutoff valves.

    Code of Federal Regulations, 2012 CFR

    2012-10-01

    ... 46 Shipping 7 2012-10-01 2012-10-01 false Fuel shutoff valves. 185.608 Section 185.608 Shipping COAST GUARD, DEPARTMENT OF HOMELAND SECURITY (CONTINUED) SMALL PASSENGER VESSELS (UNDER 100 GROSS TONS) OPERATIONS Markings Required § 185.608 Fuel shutoff valves. Remote fuel shutoff stations must be marked...

  7. 46 CFR 185.508 - Wearing of life jackets.

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    ... 46 Shipping 7 2010-10-01 2010-10-01 false Wearing of life jackets. 185.508 Section 185.508 Shipping COAST GUARD, DEPARTMENT OF HOMELAND SECURITY (CONTINUED) SMALL PASSENGER VESSELS (UNDER 100 GROSS TONS) OPERATIONS Preparations for Emergencies § 185.508 Wearing of life jackets. (a) The master of...

  8. 46 CFR 185.508 - Wearing of life jackets.

    Code of Federal Regulations, 2014 CFR

    2014-10-01

    ... 46 Shipping 7 2014-10-01 2014-10-01 false Wearing of life jackets. 185.508 Section 185.508 Shipping COAST GUARD, DEPARTMENT OF HOMELAND SECURITY (CONTINUED) SMALL PASSENGER VESSELS (UNDER 100 GROSS TONS) OPERATIONS Preparations for Emergencies § 185.508 Wearing of life jackets. (a) The master of...

  9. 46 CFR 185.508 - Wearing of life jackets.

    Code of Federal Regulations, 2013 CFR

    2013-10-01

    ... 46 Shipping 7 2013-10-01 2013-10-01 false Wearing of life jackets. 185.508 Section 185.508 Shipping COAST GUARD, DEPARTMENT OF HOMELAND SECURITY (CONTINUED) SMALL PASSENGER VESSELS (UNDER 100 GROSS TONS) OPERATIONS Preparations for Emergencies § 185.508 Wearing of life jackets. (a) The master of...

  10. 46 CFR 185.115 - Applicability; preemptive effect.

    Code of Federal Regulations, 2013 CFR

    2013-10-01

    ... 46 Shipping 7 2013-10-01 2013-10-01 false Applicability; preemptive effect. 185.115 Section 185... 100 GROSS TONS) OPERATIONS General Provisions § 185.115 Applicability; preemptive effect. (a) An... occurs after March 11, 1996. (d) The regulations in this part have preemptive effect over State or...

  11. 49 CFR 18.5 - Effect on other issuances.

    Code of Federal Regulations, 2013 CFR

    2013-10-01

    ... 49 Transportation 1 2013-10-01 2013-10-01 false Effect on other issuances. 18.5 Section 18.5 Transportation Office of the Secretary of Transportation UNIFORM ADMINISTRATIVE REQUIREMENTS FOR GRANTS AND COOPERATIVE AGREEMENTS TO STATE AND LOCAL GOVERNMENTS General § 18.5 Effect on other issuances. All...

  12. 46 CFR 185.115 - Applicability; preemptive effect.

    Code of Federal Regulations, 2014 CFR

    2014-10-01

    ... 46 Shipping 7 2014-10-01 2014-10-01 false Applicability; preemptive effect. 185.115 Section 185... 100 GROSS TONS) OPERATIONS General Provisions § 185.115 Applicability; preemptive effect. (a) An... occurs after March 11, 1996. (d) The regulations in this part have preemptive effect over State or...

  13. 46 CFR 172.185 - Permeability of spaces.

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    ... 46 Shipping 7 2010-10-01 2010-10-01 false Permeability of spaces. 172.185 Section 172.185 Shipping... Under Subchapter O of This Chapter § 172.185 Permeability of spaces. (a) When doing the calculations required in § 172.170, the permeability of a floodable space other than a machinery space must be as...

  14. 46 CFR 172.185 - Permeability of spaces.

    Code of Federal Regulations, 2011 CFR

    2011-10-01

    ... 46 Shipping 7 2011-10-01 2011-10-01 false Permeability of spaces. 172.185 Section 172.185 Shipping... Under Subchapter O of This Chapter § 172.185 Permeability of spaces. (a) When doing the calculations required in § 172.170, the permeability of a floodable space other than a machinery space must be as...

  15. 46 CFR 185.340 - Vessels carrying vehicles.

    Code of Federal Regulations, 2013 CFR

    2013-10-01

    ... 46 Shipping 7 2013-10-01 2013-10-01 false Vessels carrying vehicles. 185.340 Section 185.340... TONS) OPERATIONS Miscellaneous Operating Requirements § 185.340 Vessels carrying vehicles. (a) Automobiles or other vehicles must be stowed in such a manner as to permit both passengers and crew to get...

  16. 46 CFR 185.340 - Vessels carrying vehicles.

    Code of Federal Regulations, 2014 CFR

    2014-10-01

    ... 46 Shipping 7 2014-10-01 2014-10-01 false Vessels carrying vehicles. 185.340 Section 185.340... TONS) OPERATIONS Miscellaneous Operating Requirements § 185.340 Vessels carrying vehicles. (a) Automobiles or other vehicles must be stowed in such a manner as to permit both passengers and crew to get...

  17. 46 CFR 185.340 - Vessels carrying vehicles.

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    ... 46 Shipping 7 2010-10-01 2010-10-01 false Vessels carrying vehicles. 185.340 Section 185.340... TONS) OPERATIONS Miscellaneous Operating Requirements § 185.340 Vessels carrying vehicles. (a) Automobiles or other vehicles must be stowed in such a manner as to permit both passengers and crew to get...

  18. 46 CFR 185.340 - Vessels carrying vehicles.

    Code of Federal Regulations, 2011 CFR

    2011-10-01

    ... 46 Shipping 7 2011-10-01 2011-10-01 false Vessels carrying vehicles. 185.340 Section 185.340... TONS) OPERATIONS Miscellaneous Operating Requirements § 185.340 Vessels carrying vehicles. (a) Automobiles or other vehicles must be stowed in such a manner as to permit both passengers and crew to get...

  19. 46 CFR 185.340 - Vessels carrying vehicles.

    Code of Federal Regulations, 2012 CFR

    2012-10-01

    ... 46 Shipping 7 2012-10-01 2012-10-01 false Vessels carrying vehicles. 185.340 Section 185.340... TONS) OPERATIONS Miscellaneous Operating Requirements § 185.340 Vessels carrying vehicles. (a) Automobiles or other vehicles must be stowed in such a manner as to permit both passengers and crew to get...

  20. 46 CFR 185.502 - Crew and passenger list.

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    ... 46 Shipping 7 2010-10-01 2010-10-01 false Crew and passenger list. 185.502 Section 185.502... TONS) OPERATIONS Preparations for Emergencies § 185.502 Crew and passenger list. (a) The owner.... (b) The master of a vessel required to prepare a crew and passenger list by paragraph (a) of...

  1. RHENIUM SOLUBILITY IN BOROSILICATE NUCLEAR WASTE GLASS IMPLICATIONS FOR THE PROCESSING AND IMMOBILIZATION OF TECHNETIUM-99 (AND SUPPORTING INFORMATION WITH GRAPHICAL ABSTRACT)

    SciTech Connect

    AA KRUGER; A GOEL; CP RODRIGUEZ; JS MCCLOY; MJ SCHWEIGER; WW LUKENS; JR, BJ RILEY; D KIM; M LIEZERS; P HRMA

    2012-08-13

    The immobilization of 99Tc in a suitable host matrix has proved a challenging task for researchers in the nuclear waste community around the world. At the Hanford site in Washington State in the U.S., the total amount of 99Tc in low-activity waste (LAW) is {approx} 1,300 kg and the current strategy is to immobilize the 99Tc in borosilicate glass with vitrification. In this context, the present article reports on the solubility and retention of rhenium, a nonradioactive surrogate for 99Tc, in a LAW sodium borosilicate glass. Due to the radioactive nature of technetium, rhenium was chosen as a simulant because of previously established similarities in ionic radii and other chemical aspects. The glasses containing target Re concentrations varying from 0 to10,000 ppm by mass were synthesized in vacuum-sealed quartz ampoules to minimize the loss of Re by volatilization during melting at 1000 DC. The rhenium was found to be present predominantly as Re7 + in all the glasses as observed by X-ray absorption near-edge structure (XANES). The solubility of Re in borosilicate glasses was determined to be {approx}3,000 ppm (by mass) using inductively coupled plasma-optical emission spectroscopy (ICP-OES). At higher rhenium concentrations, some additional material was retained in the glasses in the form of alkali perrhenate crystalline inclusions detected by X-ray diffraction (XRD) and laser ablation-ICP mass spectrometry (LA-ICP-MS). Assuming justifiably substantial similarities between Re7 + and Tc 7+ behavior in this glass system, these results implied that the processing and immobilization of 99Tc from radioactive wastes should not be limited by the solubility of 99Tc in borosilicate LAW glasses.

  2. Functionalization of Rhenium Aryl Bonds by O-Atom Transfer

    SciTech Connect

    Bischof, Steven M.; Cheng, Mu-Jeng; Nielsen, Robert J.; Gunnoe, T. Brent; Goddard, William A.; Periana, Roy A.

    2011-03-29

    Aryltrioxorhenium (ArReO3) has been demonstrated to show rapid oxy-functionalization upon reaction with O-atom donors, YO, to selectively generate the corresponding phenols in near quantitative yields. 18O-Labeling experiments show that the oxygen in the products is exclusively from YO. DFT studies reveal a 10.7 kcal/mol barrier (Ar = Ph) for oxy-functionalization with H2O2 via a Baeyer-Villiger type mechanism involving nucleophilic attack of the aryl group on an electrophilic oxygen of YO coordinated to rhenium.

  3. Ultra-small rhenium clusters supported on graphene.

    PubMed

    Miramontes, Orlando; Bonafé, Franco; Santiago, Ulises; Larios-Rodriguez, Eduardo; Velázquez-Salazar, Jesús J; Mariscal, Marcelo M; Yacaman, Miguel José

    2015-03-28

    The adsorption of very small rhenium clusters (2-13 atoms) supported on graphene was studied by high-angle annular dark field-scanning transmission electron microscopy (HAADF-STEM). The atomic structure of the clusters was fully resolved with the aid of density functional theory calculations and STEM simulations. It was found that octahedral and tetrahedral structures work as seeds to obtain more complex morphologies. Finally, a detailed analysis of the electronic structure suggested that a higher catalytic effect can be expected in Re clusters when adsorbed on graphene than in isolated ones.

  4. Preparation and properties of polytetrafluoroethylene impregnated with rhenium oxides

    NASA Technical Reports Server (NTRS)

    Leibecki, H. F.; Easter, R. W.

    1973-01-01

    The results of tests carried out to determine the properties of polytetrafluorethylene (PTFE) impregnated with rhenium oxides are presented. The tests included measurement of physical properties of the impregnated material and investigation of the effects of preparation process variables. Based on the latter tests a mechanism to describe the permeation process is postulated which identifies the rate controlling step to be diffusion of ReF6 molecules into the solid during the initial ReF6 soak. Physical property tests indicated that the electronic conductance is increased by many orders of magnitude while the desirable properties of the PTFE remain virtually unchanged.

  5. Molecular Engineering of Technetium and Rhenium Based Radiopharmaceuticals

    SciTech Connect

    Zubieta, J.

    2003-06-30

    The research was based on the observation that despite the extraordinarily rich coordination chemistry of technetium and rhenium and several notable successes in reagent design, the extensive investigations by numerous research groups on a variety of N{sub 2}S{sub 2} and N{sub 3}S donor type ligands and on HYNIC have revealed that the chemistries of these ligands with Tc and Re are rather complex, giving rise to considerable difficulties in the development of reliable procedures for the development of radiopharmaceutical reagents.

  6. Ultra-small rhenium clusters supported on graphene

    PubMed Central

    Miramontes, Orlando; Bonafé, Franco; Santiago, Ulises; Larios-Rodriguez, Eduardo; Velázquez-Salazar, Jesús J.; Mariscal, Marcelo M.; Yacaman, Miguel José

    2015-01-01

    The adsorption of very small rhenium clusters (2 – 13 atoms) supported on graphene was studied with high annular dark field - scanning transmission electron microscopy (HAADF-STEM). The atomic structure of the clusters was fully resolved with the aid of density functional calculations and STEM simulations. It was found that octahedral and tetrahedral structures work as seeds to obtain more complex morphologies. Finally, a detailed analysis of the electronic structure suggested that a higher catalytic effect can be expected in Re clusters when adsorbed on graphene than in isolated ones. PMID:25721176

  7. Ambient aging of rhenium filaments used in thermal ionization mass spectrometry: Growth of oxo-rhenium crystallites and anti-aging strategies.

    PubMed

    Mannion, Joseph M; Wellons, Matthew S; Shick, Charles R; Fugate, Glenn A; Powell, Brian A; Husson, Scott M

    2017-01-01

    Degassing is a common preparation technique for rhenium filaments used for thermal ionization mass spectrometric analysis of actinides, including plutonium. Although optimization studies regarding degassing conditions have been reported, little work has been done to characterize filament aging after degassing. In this study, the effects of filament aging after degassing were explored to determine a "shelf-life" for degassed rhenium filaments, and methods to limit filament aging were investigated. Zone-refined rhenium filaments were degassed by resistance heating under high vacuum before exposure to ambient atmosphere for up to 2 months. After degassing the nucleation and preferential growth of oxo-rhenium crystallites on the surface of polycrystalline rhenium filaments was observed by atomic force microscopy and scanning electron microscopy (SEM). Compositional analysis of the crystallites was conducted using SEM-Raman spectroscopy and SEM energy dispersive X-ray spectroscopy, and grain orientation at the metal surface was investigated by electron back-scatter diffraction mapping. Spectra collected by SEM-Raman suggest crystallites are composed primarily of perrhenic acid. The relative extent of growth and crystallite morphology were found to be grain dependent and affected by the dissolution of carbon into filaments during annealing (often referred to as carbonization or carburization). Crystallites were observed to nucleate in region specific modes and grow over time through transfer of material from the surface. Factors most likely to affect the rates of crystallite growth include rhenium substrate properties such as grain size, orientation, levels of dissolved carbon, and relative abundance of defect sites; as well as environmental factors such as length of exposure to oxygen and relative humidity. Thin (∼180 nm) hydrophobic films of poly(vinylbenzyl chloride) were found to slow the growth of oxo-rhenium crystallites on the filament surfaces and may serve as

  8. Redox reactivity of mononuclear and binuclear rhenium complexes

    SciTech Connect

    Holder, G.N.

    1988-01-01

    Six different classes of monomeric and dimeric rhenium complexes containing substituted nitriles, substituted pyridines, dithiocarbamates, and substituted phosphines as ligands were synthesized. Monomers had the general formula ReCl{sub 3} (NCR) (PPh{sub 3}){sub 2}, ReCl{sub 3}-(NCCH{sub 3})(P-(aryl-R){sub 3}){sub 2}, and ReOCl{sub 3} (P-(aryl-R){sub 3}){sub 2}. Dimers had the general formula Re{sub 2}Cl{sub 4} (dppm){sub 2} (NCR) and (Re{sub 2}Cl{sub 3}(dppm){sub 2}-(NCR){sub 2}){sup +} (dppm = bis(diphenylphosphino)methane) and Re{sub 2}O{sub 3}Cl{sub 4}-(py){sub 4}, where R was an alkyl or halogenated substituent chosen to systematically vary the donor-acceptor properties of the nitrile, pyridine, or phosphine ligand. The effects of this structural change on the function of the molecule was monitored both spectrally and electrochemically. Rate constants for addition of nitriles to the metal-metal bridged dimeric complex were found to vary linearly with the identity of the substitutent. Spectroscopic data followed these trends as well. The structure-function relationships derived from this work will aid in the design of future Technetium and Rhenium-based organ selective radioimaging agents.

  9. Testing of Wrought Iridium/Chemical Vapor Deposition Rhenium Rocket

    NASA Technical Reports Server (NTRS)

    Reed, Brian D.; Schneider, Steven J.

    1996-01-01

    A 22-N class, iridium/rhenium (Ir/Re) rocket chamber, composed of a thick (418 miocrometer) wrought iridium (Ir) liner and a rhenium substrate deposited via chemical vapor deposition, was tested over an extended period on gaseous oxygen/gaseous hydrogen (GO2/GH2) propellants. The test conditions were designed to produce species concentrations similar to those expected in an Earth-storable propellant combustion environment. Temperatures attained in testing were significantly higher than those expected with Earth-storable propellants, both because of the inherently higher combustion temperature of GO2/GH2 propellants and because the exterior surface of the rocket was not treated with a high-emissivity coating that would be applied to flight class rockets. Thus the test conditions were thought to represent a more severe case than for typical operational applications. The chamber successfully completed testing (over 11 hr accumulated in 44 firings), and post-test inspections showed little degradation of the Ir liner. The results indicate that use of a thick, wrought Ir liner is a viable alternative to the Ir coatings currently used for Ir/Re rockets.

  10. Fluorescent rhenium-naphthalimide conjugates as cellular imaging agents.

    PubMed

    Langdon-Jones, Emily E; Symonds, Nadine O; Yates, Sara E; Hayes, Anthony J; Lloyd, David; Williams, Rebecca; Coles, Simon J; Horton, Peter N; Pope, Simon J A

    2014-04-07

    A range of biologically compatible, fluorescent rhenium-naphthalimide conjugates, based upon the rhenium fac-tricarbonyl core, has been synthesized. The fluorescent ligands are based upon a N-functionalized, 4-amino-derived 1,8-naphthalimide core and incorporate a dipicolyl amine binding unit to chelate Re(I); the structural variations accord to the nature of the alkylated imide with ethyl ester glycine (L(1)), 3-propanol (L(2)), diethylene glycol (L(3)), and benzyl alcohol (L(4)) variants. The species are fluorescent in the visible region between 505 and 537 nm through a naphthalimide-localized intramolecular charge transfer, with corresponding fluorescent lifetimes of up to 9.8 ns. The ligands and complexes were investigated for their potential as imaging agents for human osteoarthritic cells and protistan fish parasite Spironucleus vortens using confocal fluorescence microscopy. The results show that the specific nature of the naphthalimide structure serves to control the uptake and intracellular localization of these imaging agents. Significant differences were noted between the free ligands and complexes, with the Re(I) complex of L(2) showing hydrogenosomal localization in S. vortens.

  11. The first finds of rhenium minerals in Karelia

    NASA Astrophysics Data System (ADS)

    Lavrov, O. B.; Kuleshevich, L. V.

    2010-05-01

    Rhenium is one of the rarest elements of the earth crust (abundance ratio 0.7 mg/t). In the Karelian region, Re and accompanying Os were discovered in a copper-molybdenum-porphyry ore formation, represented by the Lobash deposit, the Jalonvaara occurrences etc., and in a noble-metal-Cu-U-vanadium ore formation (Padma Group occurrences). Molybdenites from the above deposits are enriched in Re and Os (Lobash: 13-187 g/t Re, 0.4-6 g/t Os). So far, however, no rhenium minerals proper have been revealed in the Karelian deposits and occurrences of the above formations or elsewhere. As a result of the microprobe study of mineral assemblages of cupreous sandstones from the Voronov Bor deposit (bornite ore) and sulphide-copper-nickel ore from the Rybozero deposit, osmium-cupreous rheniite (Re, Cu, Os, Fe)1S2 that contains 56.53-60.25% Re, 4.61-10.99% Cu, 1.52-3.77% Os and up to 4.75% Fe was revealed and studied for the first time.

  12. A Functional Role for the GCC185 Golgin in Mannose 6-Phosphate Receptor Recycling

    PubMed Central

    Reddy, Jonathan V.; Burguete, Alondra Schweizer; Sridevi, Khambhampaty; Ganley, Ian G.; Nottingham, Ryan M.

    2006-01-01

    Mannose 6-phosphate receptors (MPRs) deliver newly synthesized lysosomal enzymes to endosomes and then recycle to the Golgi. MPR recycling requires Rab9 GTPase; Rab9 recruits the cytosolic adaptor TIP47 and enhances its ability to bind to MPR cytoplasmic domains during transport vesicle formation. Rab9-bearing vesicles then fuse with the trans-Golgi network (TGN) in living cells, but nothing is known about how these vesicles identify and dock with their target. We show here that GCC185, a member of the Golgin family of putative tethering proteins, is a Rab9 effector that is required for MPR recycling from endosomes to the TGN in living cells, and in vitro. GCC185 does not rely on Rab9 for its TGN localization; depletion of GCC185 slightly alters the Golgi ribbon but does not interfere with Golgi function. Loss of GCC185 triggers enhanced degradation of mannose 6-phosphate receptors and enhanced secretion of hexosaminidase. These data assign a specific pathway to an interesting, TGN-localized protein and suggest that GCC185 may participate in the docking of late endosome-derived, Rab9-bearing transport vesicles at the TGN. PMID:16885419

  13. Development of Improved Rhenium Coatings for Fluorine Engine Thrust Chambers. [hydrazine-fluorine rocket engines

    NASA Technical Reports Server (NTRS)

    Barton, K. J.; Yurkewycz, R.; Harada, Y.; Daniels, I.

    1981-01-01

    Coating trials were undertaken to evaluate the application of rhenium to carbon-carbon composite sheet by plasma spraying. Optimum spray parameters and coating thickness were identified for production of coatings free from continuous defects and with adequate adherence to the substrate. A tungsten underlayer was not beneficial and possibly detracted from coating integrity. Stress calculations indicated that the proposed operating cycle of the rocket engine would not cause spalling of the rhenium coating. Calculations indicated that permeation of gases through the coating would not be significant during the expected life of the thrust chamber. The feasibility of applying rhenium coatings by laser melting was also studied. Poor wetting of the composite surface by the liquid rhenium precluded production of uniform coatings. Borate/carborate fluxes did not improve wetting characteristics.

  14. Mechanistic insights into the rhenium-catalyzed alcohol-to-olefin dehydration reaction.

    PubMed

    Korstanje, Ties J; Jastrzebski, Johann T B H; Klein Gebbink, Robertus J M

    2013-09-23

    Rhenium-based complexes are powerful catalysts for the dehydration of various alcohols to the corresponding olefins. Here, we report on both experimental and theoretical (DFT) studies into the mechanism of the rhenium-catalyzed dehydration of alcohols to olefins in general, and the methyltrioxorhenium-catalyzed dehydration of 1-phenylethanol to styrene in particular. The experimental and theoretical studies are in good agreement, both showing the involvement of several proton transfers, and of a carbenium ion intermediate in the catalytic cycle.

  15. The localization of the Golgin GCC185 is independent of Rab6A/A' and Arl1.

    PubMed

    Houghton, Fiona J; Chew, Pau Ling; Lodeho, Sylvain; Goud, Bruno; Gleeson, Paul A

    2009-08-21

    Mammalian golgins of the trans-Golgi network (TGN) are small G protein effectors that are required for membrane transport and contain a Golgi targeting C-terminal GRIP domain. The localization of two TGN golgins, p230/golgin-245 and golgin-97, is mediated by the small GTPase Arl1, whereas recruitment of the TGN golgin GCC185 is controversial. Recently, GCC185 was proposed to localize to the Golgi by the co-operation of two small GTPases, Rab6A/A' and Arl1 (Burguete et al., 2008), a model based predominantly on in vitro interactions. Here we demonstrate that Golgi recruitment of endogenous GCC185 does not involve Rab6A/A' and Arl1. We find minimal colocalization between Rab6A/A' and endogenous GCC185 on Golgi membranes and failed to detect an interaction between Rab6A/A' and C-terminal domains of GCC185 by yeast two-hybrid analyses. Moreover, depletion of both Rab6A/A' and Arl1 also had no effect on the localization of endogenous GCC185 or the isolated GRIP domain of GCC185.

  16. Spectrophotometric catalytic determination of small amounts of rhenium in mineralized rocks and molybdenite

    USGS Publications Warehouse

    Simon, F.O.; Grimaldi, F.S.

    1962-01-01

    Rhenium is determined by spectrophotometry of the tellurium sol formed by the reduction of tellurate by stannous chloride under the catalytic influence of rhenium. A detailed investigation of the conditions for high sensitivity and stability at lowest concentration levels of rhenium is presented as well as the behavior of 26 ions. The method is applied to the determination of some tenths of 1 p.p.m. or more of rhenium in a 1-mg. aliquot of mineralized rocks, mixtures of molybdenite and rocks, and molybdenite concentrates. The practical quantity limit of detection is 2 ?? 10-10 gram of rhenium. Samples are decomposed with a mixture of CaO, CaCl2, and MgO. On leaching, most constituents of the sample are precipitated either as calcium salts or hydroxides, except for rhenium and a small amount of molybdenum which pass into the filtrate. Residual molybdenum is removed by extraction with 8-quinolinol in chloroform. Better than 95% recoveries are obtained with two fusions with flux.

  17. Separation of rhenium from molybdenum, tungsten, vanadium, platinum metals and other elements by reduction and solvent extraction.

    PubMed

    Yatirajam, V; Kakkar, L R

    1970-08-01

    Reduction in 1 M H(2)SO(4) with liquid zinc amalgam and extraction with isopentanol from 3M H(2)SO(4), separates rhenium from almost all the interfering elements of importance in rhenium determination. The small amounts of Mo, U, Fe and Ru still accompanying rhenium are removed by the thiocyanate-pentyl acetate or the oxine-chloroform extraction. The method is simple, rapid and of very wide applicability. It is particularly useful in the determination of rhenium in various alloys and tungsten-containing samples.

  18. Organometallic Rhenium Complexes Divert Doxorubicin to the Mitochondria.

    PubMed

    Imstepf, Sebastian; Pierroz, Vanessa; Rubbiani, Riccardo; Felber, Michael; Fox, Thomas; Gasser, Gilles; Alberto, Roger

    2016-02-18

    Doxorubicin, a well-established chemotherapeutic agent, is known to accumulate in the cell nucleus. By using ICP-MS, we show that the conjugation of two small organometallic rhenium complexes to this structural motif results in a significant redirection of the conjugates from the nucleus to the mitochondria. Despite this relocation, the two bioconjugates display excellent toxicity toward HeLa cells. In addition, we carried out a preliminarily investigation of aspects of cytotoxicity and present evidence that the conjugates disrupt the mitochondrial membrane potential, are strong inhibitors of human Topoisomerase II, and induce apoptosis. Such derivatives may enhance the therapeutic index of the aggressive parent drug and overcome drug resistance by influencing nuclear and mitochondrial homeostasis.

  19. Raman scattering from superhard rhenium diboride under high pressure

    SciTech Connect

    Xie, Miao; Winkler, Björn; Mao, Zhu; Kaner, Richard B.; Tolbert, Sarah H. E-mail: tolbert@chem.ucla.edu; Kavner, Abby E-mail: tolbert@chem.ucla.edu

    2014-01-06

    Lattice vibrational properties of superhard rhenium diboride (ReB{sub 2}) were examined up to 8 GPa in a diamond anvil cell using Raman spectroscopy techniques. Linear pressure coefficients and mode Grüneisen parameters are obtained. Good agreement is found between the experimental and theoretical calculated Grüneisen parameters. Examination of the calculated mode Grüneisen parameters reveals that both B-B and Re-B covalent bonds play a dominant role in supporting the applied load under pressure. A comparison of vibrations parallel and perpendicular to the c-axis indicates that bonds along the c-axis tend to take greater loads. Our results agree with observations of elastic lattice anisotropy obtained from both in situ X-ray diffraction measurements and ultrasonic resonance spectra.

  20. Lattice Dynamics of the Rhenium and Technetium Dichalcogenides

    NASA Astrophysics Data System (ADS)

    Wolverson, Daniel; Hart, Lewis S.

    2016-05-01

    The rhenium and technetium dichalcogenides are layered van der Waals semiconductors which show a large number of Raman-active zone-centre phonon modes as a result of their unusually large unit cells and deviation from hexagonal symmetry. They thus offer the possibility of introducing in-plane anisotropy into composite heterostructures based on van der Waals materials, and Raman spectroscopy is generally used to determine their in-plane orientation. We show that first-principles calculations give a good description of the lattice dynamics of this family of materials and thus predict the zone-centre phonon frequencies and Raman activities of TcS2. We consider the distribution of the phonon modes in frequency and their atomic displacements and give a unified understanding of the phonon frequencies and Raman spectra of ReS2, TcS2 and ReSe2 in terms of the scaling of Raman frequency with the chalcogen mass.

  1. Nitrogen concentration driving the hardness of rhenium nitrides

    PubMed Central

    Zhao, Zhonglong; Bao, Kuo; Li, Da; Duan, Defang; Tian, Fubo; Jin, Xilian; Chen, Changbo; Huang, Xiaoli; Liu, Bingbing; Cui, Tian

    2014-01-01

    The structures and properties of rhenium nitrides are studied with density function based first principle method. New candidate ground states or high-pressure phases at Re:N ratios of 3:2, 1:3, and 1:4 are identified via a series of evolutionary structure searches. We find that the 3D polyhedral stacking with strong covalent N-N and Re-N bonding could stabilize Re nitrides to form nitrogen rich phases, meanwhile, remarkably improve the mechanical performance than that of sub-nitrides, as Re3N, Re2N, and Re3N2. By evaluating the trends of the crystal configuration, electronic structure, elastic properties, and hardness as a function of the N concentration, we proves that the N content is the key factor affecting the metallicity and hardness of Re nitrides. PMID:24762713

  2. Iridium-Coated Rhenium Radiation-Cooled Rockets

    NASA Technical Reports Server (NTRS)

    Reed, Brian D.; Biaglow, James A.; Schneider, Steven J.

    1997-01-01

    Radiation-cooled rockets are used for a range of low-thrust propulsion functions, including apogee insertion, attitude control, and repositioning of satellites, reaction control of launch vehicles, and primary propulsion for planetary space- craft. The key to high performance and long lifetimes for radiation-cooled rockets is the chamber temperature capability. The material system that is currently used for radiation-cooled rockets, a niobium alloy (C103) with a fused silica coating, has a maximum operating temperature of 1370 C. Temperature limitations of C103 rockets force the use of fuel film cooling, which degrades rocket performance and, in some cases, imposes a plume contamination issue from unburned fuel. A material system composed of a rhenium (Re) substrate and an iridium (Ir) coating has demonstrated operation at high temperatures (2200 C) and for long lifetimes (hours). The added thermal margin afforded by iridium-coated rhenium (Ir/Re) allows reduction or elimination of fuel film cooling. This, in turn, leads to higher performance and cleaner spacecraft environments. There are ongoing government- and industry-sponsored efforts to develop flight Ir/ Re engines, with the primary focus on 440-N, apogee insertion engines. Complementing these Ir/Re engine development efforts is a program to address specific concerns and fundamental characterization of the Ir/Re material system, including (1) development of Ir/Re rocket fabrication methods, (2) establishment of critical Re mechanical properly data, (3) development of reliable joining methods, and (4) characterization of Ir/Re life-limiting mechanisms.

  3. 49 CFR 173.185 - Lithium cells and batteries.

    Code of Federal Regulations, 2013 CFR

    2013-10-01

    ... 49 Transportation 2 2013-10-01 2013-10-01 false Lithium cells and batteries. 173.185 Section 173... Class 7 § 173.185 Lithium cells and batteries. (a) Cells and batteries. A lithium cell or battery, including a lithium polymer cell or battery and a lithium-ion cell or battery, must conform to all of...

  4. 49 CFR 173.185 - Lithium cells and batteries.

    Code of Federal Regulations, 2012 CFR

    2012-10-01

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  5. 46 CFR 185.202 - Notice of casualty.

    Code of Federal Regulations, 2012 CFR

    2012-10-01

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  6. 46 CFR 185.202 - Notice of casualty.

    Code of Federal Regulations, 2014 CFR

    2014-10-01

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  7. 46 CFR 185.202 - Notice of casualty.

    Code of Federal Regulations, 2013 CFR

    2013-10-01

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  8. 46 CFR 185.202 - Notice of casualty.

    Code of Federal Regulations, 2011 CFR

    2011-10-01

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  9. 46 CFR 185.202 - Notice of casualty.

    Code of Federal Regulations, 2010 CFR

    2010-10-01

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  10. 40 CFR 160.185 - Reporting of study results.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ... 40 Protection of Environment 23 2010-07-01 2010-07-01 false Reporting of study results. 160.185... GOOD LABORATORY PRACTICE STANDARDS Records and Reports § 160.185 Reporting of study results. (a) A final report shall be prepared for each study and shall include, but not necessarily be limited to,...

  11. 40 CFR 160.185 - Reporting of study results.

    Code of Federal Regulations, 2011 CFR

    2011-07-01

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  12. 40 CFR 160.185 - Reporting of study results.

    Code of Federal Regulations, 2013 CFR

    2013-07-01

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  13. 40 CFR 160.185 - Reporting of study results.

    Code of Federal Regulations, 2012 CFR

    2012-07-01

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  14. 5 CFR 550.185 - Payment of availability pay.

    Code of Federal Regulations, 2013 CFR

    2013-01-01

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  15. 5 CFR 550.185 - Payment of availability pay.

    Code of Federal Regulations, 2011 CFR

    2011-01-01

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    Code of Federal Regulations, 2014 CFR

    2014-01-01

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  17. 5 CFR 550.185 - Payment of availability pay.

    Code of Federal Regulations, 2012 CFR

    2012-01-01

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  18. 5 CFR 550.185 - Payment of availability pay.

    Code of Federal Regulations, 2010 CFR

    2010-01-01

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  19. 46 CFR 185.352 - Ventilation of gasoline machinery spaces.

    Code of Federal Regulations, 2011 CFR

    2011-10-01

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  20. 46 CFR 185.352 - Ventilation of gasoline machinery spaces.

    Code of Federal Regulations, 2013 CFR

    2013-10-01

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  1. 46 CFR 185.352 - Ventilation of gasoline machinery spaces.

    Code of Federal Regulations, 2014 CFR

    2014-10-01

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  2. 49 CFR 173.185 - Lithium cells and batteries.

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    ... 49 Transportation 2 2010-10-01 2010-10-01 false Lithium cells and batteries. 173.185 Section 173... Class 7 § 173.185 Lithium cells and batteries. (a) Cells and batteries. A lithium cell or battery, including a lithium polymer cell or battery and a lithium-ion cell or battery, must conform to all of...

  3. 46 CFR 185.610 - Watertight doors and watertight hatches.

    Code of Federal Regulations, 2010 CFR

    2010-10-01

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  4. 46 CFR 185.610 - Watertight doors and watertight hatches.

    Code of Federal Regulations, 2011 CFR

    2011-10-01

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  5. 46 CFR 185.704 - Maintenance of falls.

    Code of Federal Regulations, 2010 CFR

    2010-10-01

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  6. 49 CFR 173.185 - Lithium cells and batteries.

    Code of Federal Regulations, 2011 CFR

    2011-10-01

    ... 49 Transportation 2 2011-10-01 2011-10-01 false Lithium cells and batteries. 173.185 Section 173... Class 7 § 173.185 Lithium cells and batteries. (a) Cells and batteries. A lithium cell or battery, including a lithium polymer cell or battery and a lithium-ion cell or battery, must conform to all of...

  7. 5 CFR 185.139 - Appeal to authority head.

    Code of Federal Regulations, 2011 CFR

    2011-01-01

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  8. 5 CFR 185.139 - Appeal to authority head.

    Code of Federal Regulations, 2013 CFR

    2013-01-01

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  9. 5 CFR 185.139 - Appeal to authority head.

    Code of Federal Regulations, 2012 CFR

    2012-01-01

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    Code of Federal Regulations, 2014 CFR

    2014-01-01

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  11. 5 CFR 185.139 - Appeal to authority head.

    Code of Federal Regulations, 2010 CFR

    2010-01-01

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  12. 27 CFR 53.185 - Credit on returns.

    Code of Federal Regulations, 2012 CFR

    2012-04-01

    ... 27 Alcohol, Tobacco Products and Firearms 2 2012-04-01 2011-04-01 true Credit on returns. 53.185... Other Administrative Provisions of Special Application to Manufacturers Taxes § 53.185 Credit on returns..., in lieu of claiming refund of the overpayment, claim credit for the overpayment on any return of...

  13. 27 CFR 53.185 - Credit on returns.

    Code of Federal Regulations, 2013 CFR

    2013-04-01

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  14. 46 CFR 108.185 - Ventilation for enclosed classified locations.

    Code of Federal Regulations, 2011 CFR

    2011-10-01

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  15. 46 CFR 108.185 - Ventilation for enclosed classified locations.

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    ... Section 108.185 Shipping COAST GUARD, DEPARTMENT OF HOMELAND SECURITY (CONTINUED) A-MOBILE OFFSHORE DRILLING UNITS DESIGN AND EQUIPMENT Construction and Arrangement Ventilation § 108.185 Ventilation for... designed to maintain a pressure differential between the enclosed classified location and each...

  16. Synthesis, characterization, and biological studies of emissive rhenium-glutamine conjugates.

    PubMed

    Huang, Rachel; Langille, Graeme; Gill, Ravanjir K; Li, Cindy Mei Jin; Mikata, Yuji; Wong, May Q; Yapp, Donald T; Storr, Tim

    2013-10-01

    Two new rhenium complexes containing pyridine-triazole (pyta) and quinoline-triazole (quinta) ligands with attached glutamine-targeting agents have been characterized and tested for uptake in the HT-29 human colon adenocarcinoma cell line. The glutamine moiety in Re(CO)3Br(pyta) (1) and Re(CO)3Br(quinta) (2) remains pendant in solution. Both complexes exhibit absorptions in the 300-400-nm range with metal-to-ligand charge transfer (MLCT) character, as predicted by time-dependent density functional theory calculations. Geometrical analysis by theoretical calculations provides information on the cationic complexes 1 (+) and 2 (+) resulting from aquo for halide ligand exchange under aqueous conditions. The emissive properties of both complexes were studied under aqueous conditions, and the measured quantum yields were 0.46 % for 1 (+) and 0.18 % for 2 (+). The large Stokes shifts and oxygen sensitivity of the emission suggest a (3)MLCT process for both complexes. Cell studies in the HT-29 cell line demonstrate that both complexes are nontoxic over a large concentration range (0-1.4 mM). Preliminary uptake studies show that 2 (+), but not 1 (+), displays significant concentration-dependent uptake at 3 and 24 h.

  17. Tricarbonyl-rhenium complexes of a thiol-functionalized amphoteric poly(amidoamine).

    PubMed

    Donghi, Daniela; Maggioni, Daniela; D'Alfonso, Giuseppe; Amigoni, Federica; Ranucci, Elisabetta; Ferruti, Paolo; Manfredi, Amedea; Fenili, Fabio; Bisazza, Agnese; Cavalli, Roberta

    2009-12-14

    An amphoteric thiol-functionalized poly(amidoamine) nicknamed ISA23SH(10%) was synthesized. Rhenium complexes 1 and 2, containing 0.5 and 0.8 equiv of rhenium, respectively, were easily obtained by reacting ISA23SH(10%) with [Re(CO)(3)(H(2)O)(3)](CF(3)SO(3)) in aqueous solution at pH 5.5. Both ISA23SH(10%), and its rhenium complexes were soluble in water under physiological conditions. The resultant solutions were stable, even in the presence of cysteine. Rhenium chelation occurred through the S and N atoms of the cysteamine moiety, as demonstrated by (1)H, (13)C, and (15)N NMR spectroscopy. The diffusion coefficients and the hydrodynamic radii of ISA23SH(10%) and complex 1 were determined by pulsed gradient spin echo (PGSE) NMR experiments. The radius of the rhenium complexes 1 and 2 was always slightly larger than that of the parent polymer. TEM analysis showed that both complexes form spherical nanoparticles with narrow size distributions. Consistent results were obtained by dynamic light scattering. The observed sizes were in good agreement with those evaluated by PGSE. Preliminary in vitro and in vivo biological studies have been performed on complexes 1 and 2 as well as on the parent ISA23SH(10%). Neither hemolytic activity of the two rhenium complexes and the parent polymer, up to a concentration of 5 mg/mL, nor cytotoxic effects were observed on Hela cell after 48 h at a concentration of 100 ng/mL. In vivo toxicological tests showed that ISA23SH(10%) is highly biocompatible, with a maximum tolerated dose (MTD) of 500 mg/kg. No toxic side effects were apparent after the intravenous injection in mice of the two rhenium complexes in doses up to 20 mg/kg.

  18. Rhenium-catalysed dehydrogenative borylation of primary and secondary C(sp3)-H bonds adjacent to a nitrogen atom.

    PubMed

    Murai, Masahito; Omura, Tetsuya; Kuninobu, Yoichiro; Takai, Kazuhiko

    2015-03-18

    Rhenium-catalysed C(sp(3))-H bond borylation in the absence of any oxidant, hydrogen acceptor, or external ligand, with the generation of H2 as the sole byproduct is described. The transformation, which represents a rare example of rhenium-catalysed C(sp(3))-H bond functionalisation, features high atom efficiency and simple reaction conditions.

  19. Isotopic determinations of rhenium and osmium in meteorites by using fusion, distillation and ion-exchange separations

    USGS Publications Warehouse

    Morgan, J.W.; Walker, R.J.

    1989-01-01

    A stable isotope-dilution method using resonance ionization mass spectrometry is suitable for the determination of rhenium and osmium abundances and osmium isotopic composition in carbonaceous chondrites and iron meteorites. The chemical procedure involves sodium peroxide fusion, followed by distillation of osmium from sulfuric acid/hydrogen peroxide and subsequent anion-exchange separation of rhenium from the same solution. ?? 1989.

  20. Submersion criticality safety of tungsten-rhenium urania cermet fuel for space propulsion and power applications

    SciTech Connect

    A.E. Craft; R. C. O'Brien; S. D. Howe; J. C. King

    2014-07-01

    Nuclear thermal rockets are the preferred propulsion technology for a manned mission to Mars, and tungsten–uranium oxide cermet fuels could provide significant performance and cost advantages for nuclear thermal rockets. A nuclear reactor intended for use in space must remain subcritical before and during launch, and must remain subcritical in launch abort scenarios where the reactor falls back to Earth and becomes submerged in terrestrial materials (including seawater, wet sand, or dry sand). Submersion increases reflection of neutrons and also thermalizes the neutron spectrum, which typically increases the reactivity of the core. This effect is typically very significant for compact, fast-spectrum reactors. This paper provides a submersion criticality safety analysis for a representative tungsten/uranium oxide fueled reactor with a range of fuel compositions. Each submersion case considers both the rhenium content in the matrix alloy and the uranium oxide volume fraction in the cermet. The inclusion of rhenium significantly improves the submersion criticality safety of the reactor. While increased uranium oxide content increases the reactivity of the core, it does not significantly affect the submersion behavior of the reactor. There is no significant difference in submersion behavior between reactors with rhenium distributed within the cermet matrix and reactors with a rhenium clad in the coolant channels. The combination of the flooding of the coolant channels in submersion scenarios and the presence of a significant amount of spectral shift absorbers (i.e. high rhenium concentration) further decreases reactivity for short reactor cores compared to longer cores.

  1. [Influence of antitumor system rhenium-platinum on biochemical state of the liver].

    PubMed

    Ivchuk, V V; Polishko, T M; Golichenko, O A; Shtemenko, O V; Shtemenko, N I

    2011-01-01

    Influence of the antitumour rhenium-platinum system on biochemical liver characteristics in the model of tumor growth (Guerin carcinoma) was studied and possible hepatoprotective activity of rhenium cluster compounds when introducing them in different forms was shown, that was confirmed by decreasing of diagnostic enzymes activity in blood (aminotransferase--AST 6 times and ALT 5.6 times, lactatedehydrogenase 4.9 times, gamma-glutamyltranspeptidase 3.6 times) and normalization of morphological state of the liver cells. The hepatoprotective activity of the cluster rhenium compound with adamanthyl ligands was confirmed in the model of acute toxic hepatitis. Introduction of this compound led to reduction of the concentration of MDA in homogenates of liver tissue (2 times), and in blood plasma (3.8 times); to reduction of levels of diagnostic liver enzymes in blood--AST and ALT 5.8 and 5.5 times respectively in comparison with control group. Some aspects of the mechanism of hepatoprotection were discussed, that included the presence of conjugated systems around the quadrupol rhenium-rhenium bond and alkyl radicals with significant positive inductive effects.

  2. Supported Rhenium Complexes: Almost Uniform Rhenium Tricarbonyls Synthesized from CH[subscript 3]Re(CO)[subscript 5] and HY Zeolite

    SciTech Connect

    Lobo-Lapidus, Rodrigo J.; Gates, Bruce C.

    2010-12-07

    Supported rhenium complexes were prepared from CH{sub 3}Re(CO){sub 5} and dealuminated HY zeolite or NaY zeolite, each with a Si/Al atomic ratio of 30. The samples were characterized with infrared (IR) and extended X-ray absorption fine structure (EXAFS) spectroscopies. EXAFS data characterizing the sample formed by the reaction of CH{sub 3}Re(CO){sub 5} with dealuminated HY zeolite show that the rhenium complexes were bonded to the zeolite frame, incorporating, on average, three carbonyl ligands per Re atom (as shown by Re-C and multiple-scattering Re-O EXAFS contributions). The IR spectra, consistent with this result, show that the supported rhenium carbonyls were bonded near aluminum sites of the zeolite, as shown by the decrease in intensity of the IR bands characterizing the acidic silanol groups resulting from the reaction of the rhenium carbonyl with the zeolite. This supported metal complex was characterized by narrow peaks in the {nu}{sub CO} region of the IR spectrum, indicating highly uniform species. In contrast, the species formed from CH{sub 3}Re(CO){sub 5} on NaY zeolite lost fewer carbonyl ligands than those formed on HY zeolite and were significantly less uniform, as indicated by the greater breadth of the {nu}{sub CO} bands in the IR spectra. The results show the importance of zeolite H{sup +} sites for the formation of uniform supported rhenium carbonyls from CH{sub 3}Re(CO){sub 5}; the formation of such uniform complexes did not occur on the NaY zeolite.

  3. 50 CFR 218.185 - Applications for Letters of Authorization.

    Code of Federal Regulations, 2012 CFR

    2012-10-01

    ... IMPORTING OF MARINE MAMMALS Taking Marine Mammals Incidental to U.S. Navy Mission Activities in the Naval Surface Warfare Center Panama City Division § 218.185 Applications for Letters of Authorization....

  4. 50 CFR 218.185 - Applications for Letters of Authorization.

    Code of Federal Regulations, 2013 CFR

    2013-10-01

    ... IMPORTING OF MARINE MAMMALS Taking Marine Mammals Incidental to U.S. Navy Mission Activities in the Naval Surface Warfare Center Panama City Division § 218.185 Applications for Letters of Authorization....

  5. 50 CFR 218.185 - Applications for Letters of Authorization.

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    ... IMPORTING OF MARINE MAMMALS Taking Marine Mammals Incidental to U.S. Navy Mission Activities in the Naval Surface Warfare Center Panama City Division § 218.185 Applications for Letters of Authorization....

  6. 50 CFR 218.185 - Applications for Letters of Authorization.

    Code of Federal Regulations, 2011 CFR

    2011-10-01

    ... IMPORTING OF MARINE MAMMALS Taking Marine Mammals Incidental to U.S. Navy Mission Activities in the Naval Surface Warfare Center Panama City Division § 218.185 Applications for Letters of Authorization....

  7. Thermocouples of tantalum and rhenium alloys for more stable vacuum-high temperature performance

    NASA Technical Reports Server (NTRS)

    Morris, J. F. (Inventor)

    1977-01-01

    Thermocouples of the present invention provide stability and performance reliability in systems involving high temperatures and vacuums by employing a bimetallic thermocouple sensor wherein each metal of the sensor is selected from a group of metals comprising tantalum and rhenium and alloys containing only those two metals. The tantalum, rhenium thermocouple sensor alloys provide bare metal thermocouple sensors having advantageous vapor pressure compatibilities and performance characteristics. The compatibility and physical characteristics of the thermocouple sensor alloys of the present invention result in improved emf, temperature properties and thermocouple hot junction performance. The thermocouples formed of the tantalum, rhenium alloys exhibit reliability and performance stability in systems involving high temperatures and vacuums and are adaptable to space propulsion and power systems and nuclear environments.

  8. Thermodynamic stability and unusual strength of ultra-incompressible rhenium nitrides

    SciTech Connect

    Zhang, R. F.; Lin, Zhijun; Mao, Ho-kwang; Zhao, Yusheng

    2011-02-11

    We report on a comprehensive study of thermodynamic and mechanical properties as well as a bond-deformation mechanism on ultra-incompressible Re{sub 2} N and Re{sub 3} N. The introduction of nitrogen into the rhenium lattice leads to thermodynamic instability in Re{sub 2} N at ambient conditions and enhanced incompressibility and strength for both rhenium nitrides. Rhenium nitrides, however, show substantially lower ideal shear strength than hard ReB{sub 2} and superhard c -BN, suggesting that they cannot be intrinsically superhard. An intriguing soft “ionic bond mediated plastic deformation” mechanism is revealed to underline the physical origin of their unusual mechanical strength. These results suggest a need to reformulate the design concept of intrinsically superhard transition-metal nitrides, borides, and carbides.

  9. Methods for the separation of rhenium, osmium and molybdenum applicable to isotope geochemistry

    USGS Publications Warehouse

    Morgan, J.W.; Golightly, D.W.; Dorrzapf, A.F.

    1991-01-01

    Effective methods are described for the chemical separation of rhenium, osmium and molybdenum. The methods are based on distillation and anion-exchange chromatography, and have been the basis for rhenium-osmium isotope studies of ore deposits and meteorites. Successful anion-exchange separation of osmium requires both recognition and careful control of the osmium species in solution; thus, distillation of osmium tetroxide from a mixture of sulfuric acid and hydrogen peroxide is preferred to anion-exchange. Distribution coefficients measured for perrhenate in sulfuric acid media are sufficiently high (Kd > 500) for rhenium to be directly loaded onto an ion-exchange column from a distillation residue and subsequently eluted with nitric acid. Polymerization of molybdenum species during elution is prevented by use of a solution that is 1M in hydrochloric acid and 1M in sodium chloride. ?? 1991.

  10. Rhenium uptake and distribution in phaeophyceae macroalgae, Fucus vesiculosus

    PubMed Central

    Racionero-Gómez, B.; Sproson, A. D.; Selby, D.; Gröcke, D. R.; Redden, H.; Greenwell, H. C.

    2016-01-01

    Owing to Rhenium (Re) having no known biological role, it is not fully understood how Re is concentrated in oil kerogens. A commonly held assumption is that Re is incorporated into decomposing biomass under reducing conditions. However, living macroalgae also concentrate Re to several orders of magnitude greater than that of seawater. This study uses Fucus vesiculosus to assess Re uptake and its subsequent localization in the biomass. It is demonstrated that the Re abundance varies within the macroalgae and that Re is not located in one specific structure. In F. vesiculosus, the uptake and tolerance of Re was evaluated via tip cultures grown in seawater of different Re(VII) compound concentrations (0–7450 ng g−1). A positive correlation is shown between the concentration of Re-doped seawater and the abundance of Re accumulated in the tips. However, significant differences between Re(VII) compounds are observed. Although the specific cell structures where the Re is localized is not known, our findings suggest that Re is not held within chloroplasts or cytoplasmic proteins. In addition, metabolically inactivated F. vesiculosus does not accumulate Re, which indicates that Re uptake is via syn-life bioadsorption/bioaccumulation and that macroalgae may provide a source for Re phytomining and/or bioremediation. PMID:27293798

  11. Rhenium uptake and distribution in phaeophyceae macroalgae, Fucus vesiculosus.

    PubMed

    Racionero-Gómez, B; Sproson, A D; Selby, D; Gröcke, D R; Redden, H; Greenwell, H C

    2016-05-01

    Owing to Rhenium (Re) having no known biological role, it is not fully understood how Re is concentrated in oil kerogens. A commonly held assumption is that Re is incorporated into decomposing biomass under reducing conditions. However, living macroalgae also concentrate Re to several orders of magnitude greater than that of seawater. This study uses Fucus vesiculosus to assess Re uptake and its subsequent localization in the biomass. It is demonstrated that the Re abundance varies within the macroalgae and that Re is not located in one specific structure. In F. vesiculosus, the uptake and tolerance of Re was evaluated via tip cultures grown in seawater of different Re(VII) compound concentrations (0-7450 ng g(-1)). A positive correlation is shown between the concentration of Re-doped seawater and the abundance of Re accumulated in the tips. However, significant differences between Re(VII) compounds are observed. Although the specific cell structures where the Re is localized is not known, our findings suggest that Re is not held within chloroplasts or cytoplasmic proteins. In addition, metabolically inactivated F. vesiculosus does not accumulate Re, which indicates that Re uptake is via syn-life bioadsorption/bioaccumulation and that macroalgae may provide a source for Re phytomining and/or bioremediation.

  12. Rhenium-osmium isotope systematics of carbonaceous chondrites

    USGS Publications Warehouse

    Walker, R.J.; Morgan, J.W.

    1989-01-01

    Rhenium and osmium concentrations and Os isotopic compositions of eight carbonaceous chondrites, one LL3 ordinary chondrite, and two iron meteorites were determined by resonance ionization mass spectrometry. Iron meteorite 187Re/186Os and 187OS/186Os ratios plot on the previously determined iron meteorite isochron, but most chondrite data plot 1 to 2 percent above this meteorite isochron. This suggests either that irons have significantly younger Re-Os closure ages than chondrites or that chondrites were formed from precursor materials with different chemical histories from the precursors of irons. Some samples of Semarkona (LL3) and Murray (C2M) meteorites plot 4 to 6 percent above the iron meteorite isochron, well above the field delineated by other chondrites. Murray may have lost Re by aqueous leaching during its preterrestrial history. Semarkona could have experienced a similar loss of Re, but only slight aqueous alteration is evident in the meteorite. Therefore, the isotopic composition of Semarkona could reflect assembly of isotopically heterogeneous components subsequent to 4.55 billion years ago or Os isotopic heterogeneities in the primordial solar nebula.

  13. Nonlinear Saturable and Polarization-induced Absorption of Rhenium Disulfide

    NASA Astrophysics Data System (ADS)

    Cui, Yudong; Lu, Feifei; Liu, Xueming

    2017-01-01

    Monolayer of transition metal dichalcogenides (TMDs), with lamellar structure as that of graphene, has attracted significant attentions in optoelectronics and photonics. Here, we focus on the optical absorption response of a new member TMDs, rhenium disulphide (ReS2) whose monolayer and bulk forms have the nearly identical band structures. The nonlinear saturable and polarization-induced absorption of ReS2 are investigated at near-infrared communication band beyond its bandgap. It is found that the ReS2-covered D-shaped fiber (RDF) displays the remarkable polarization-induced absorption, which indicates the different responses for transverse electric (TE) and transverse magnetic (TM) polarizations relative to ReS2 plane. Nonlinear saturable absorption of RDF exhibits the similar saturable fluence of several tens of μJ/cm2 and modulation depth of about 1% for ultrafast pulses with two orthogonal polarizations. RDF is utilized as a saturable absorber to achieve self-started mode-locking operation in an Er-doped fiber laser. The results broaden the operation wavelength of ReS2 from visible light to around 1550 nm, and numerous applications may benefit from the anisotropic and nonlinear absorption characteristics of ReS2, such as in-line optical polarizers, high-power pulsed lasers, and optical communication system.

  14. Nonlinear Saturable and Polarization-induced Absorption of Rhenium Disulfide.

    PubMed

    Cui, Yudong; Lu, Feifei; Liu, Xueming

    2017-01-05

    Monolayer of transition metal dichalcogenides (TMDs), with lamellar structure as that of graphene, has attracted significant attentions in optoelectronics and photonics. Here, we focus on the optical absorption response of a new member TMDs, rhenium disulphide (ReS2) whose monolayer and bulk forms have the nearly identical band structures. The nonlinear saturable and polarization-induced absorption of ReS2 are investigated at near-infrared communication band beyond its bandgap. It is found that the ReS2-covered D-shaped fiber (RDF) displays the remarkable polarization-induced absorption, which indicates the different responses for transverse electric (TE) and transverse magnetic (TM) polarizations relative to ReS2 plane. Nonlinear saturable absorption of RDF exhibits the similar saturable fluence of several tens of μJ/cm(2) and modulation depth of about 1% for ultrafast pulses with two orthogonal polarizations. RDF is utilized as a saturable absorber to achieve self-started mode-locking operation in an Er-doped fiber laser. The results broaden the operation wavelength of ReS2 from visible light to around 1550 nm, and numerous applications may benefit from the anisotropic and nonlinear absorption characteristics of ReS2, such as in-line optical polarizers, high-power pulsed lasers, and optical communication system.

  15. High-Temperature Oxidation Behavior of Iridium-Rhenium Alloys

    NASA Technical Reports Server (NTRS)

    Reed, Brian D.

    1995-01-01

    The life-limiting mechanism for radiation-cooled rockets made from iridium-coated rhenium (Ir/Re) is the diffusion of Re into the Ir layer and the subsequent oxidation of the resulting Ir-Re alloy from the inner surface. In a previous study, a life model for Ir/Re rockets was developed. It incorporated Ir-Re diffusion and oxidation data to predict chamber lifetimes as a function of temperature and oxygen partial pressure. Oxidation testing at 1540 deg C suggested that a 20-wt percent Re concentration at the inner wall surface should be established as the failure criterion. The present study was performed to better define Ir-oxidation behavior as a function of Re concentration and to supplement the data base for the life model. Samples ranging from pure Ir to Ir-40 wt percent Re (Ir-40Re) were tested at 1500 deg C, in two different oxygen environments. There were indications that the oxidation rate of the Ir-Re alloy increased significantly when it went from a single-phase solid solution to a two-phase mixture, as was suggested in previous work. However, because of testing anomalies in this study, there were not enough dependable oxidation data to definitively raise the Ir/Re rocket failure criterion from 20-wt percent Re to a Re concentration corresponding to entry into the two-phase region.

  16. Polymer Photovoltaic Cells with Rhenium Oxide as Anode Interlayer.

    PubMed

    Wei, Jinyu; Bai, Dongdong; Yang, Liying

    2015-01-01

    The effect of a new transition metal oxide, rhenium oxide (ReO3), on the performance of polymer solar cells based on regioregular poly(3-hexylthiophene) (P3HT) and methanofullerene [6,6]-phenyl C61-butyric acid methyl ester (PCBM) blend as buffer layer was investigated. The effect of the thickness of ReO3 layer on electrical characteristics of the polymer solar cells was studied. It is found that insertion of ReO3 interfacial layer results in the decreased performance for P3HT: PCBM based solar cells. In order to further explore the mechanism of the decreasing of the open-circuit voltage (Voc), the X-ray photoelectron spectroscopy (XPS) is used to investigate the ReO3 oxidation states. Kelvin Probe method showed that the work function of the ReO3 is estimated to be 5.13eV after thermal evaporation. The results indicated the fact that a portion of ReO3 decomposed during thermal evaporation process, resulting in the formation of a buffer layer with a lower work function. As a consequence, a higher energy barrier was generated between the ITO and the active layer.

  17. Graphite-Conjugated Rhenium Catalysts for Carbon Dioxide Reduction

    SciTech Connect

    Oh, Seokjoon; Gallagher, James R.; Miller, Jeffrey T.; Surendranath, Yogesh

    2016-02-17

    Condensation of fac-Re(5,6-diamino-1,10-phenanthroline)(CO)(3)Cl to o-quinone edge defects on graphitic carbon surfaces generates graphite-conjugated rhenium (GCC-Re) catalysts that are highly active for CO2 reduction to CO in acetonitrile electrolyte. X-ray photo-electron and X-ray absorption spectroscopies establish the formation of surface-bound Re centers with well-defined coordination environments. GCC-Re species on glassy carbon surfaces display catalytic currents greater than 50 mA cm(-2) with 96 +/- 3% Faradaic efficiency for CO production. Normalized for the number of Re active sites, GCC-Re catalysts exhibit higher turnover frequencies than that of a soluble molecular analogue, fac-Re(1,10-phenanthroline)(CO)(3)Cl, and turnover numbers greater than 12,000. In contrast to the molecular analogue, GCC-Re surfaces display a Tafel slope of 150 mV/decade, indicative of a catalytic mechanism involving rate-limiting one-electron transfer. This work establishes graphite conjugation as a powerful strategy for generating well-defined, tunable, heterogeneous electrocatalysts on ubiquitous graphitic carbon surfaces.

  18. Rhenium Dichalcogenides: Layered Semiconductors with Two Vertical Orientations.

    PubMed

    Hart, Lewis; Dale, Sara; Hoye, Sarah; Webb, James L; Wolverson, Daniel

    2016-02-10

    The rhenium and technetium diselenides and disulfides are van der Waals layered semiconductors in some respects similar to more well-known transition metal dichalcogenides (TMD) such as molybdenum sulfide. However, their symmetry is lower, consisting only of an inversion center, so that turning a layer upside-down (that is, applying a C2 rotation about an in-plane axis) is not a symmetry operation, but reverses the sign of the angle between the two nonequivalent in-plane crystallographic axes. A given layer thus can be placed on a substrate in two symmetrically nonequivalent (but energetically similar) ways. This has consequences for the exploitation of the anisotropic properties of these materials in TMD heterostructures and is expected to lead to a new source of domain structure in large-area layer growth. We produced few-layer ReS2 and ReSe2 samples with controlled "up" or "down" orientations by micromechanical cleavage and we show how polarized Raman microscopy can be used to distinguish these two orientations, thus establishing Raman as an essential tool for the characterization of large-area layers.

  19. Rhenium-osmium isotope systematics of carbonaceous chondrites.

    PubMed

    Walker, R J; Morgan, J W

    1989-01-27

    Rhenium and osmium concentrations and Os isotopic compositions of eight carbonaceous chondrites, one LL3 ordinary chondrite, and two iron meteorites were determined by resonance ionization mass spectrometry. Iron meteorite (187)Re/(186)Os and (l87)Os/(l86)Os ratios plot on the previously determined iron meteorite isochron, but most chondrite data plot 1 to 2 percent above this meteorite isochron. This suggests either that irons have significantly younger Re-Os closure ages than chondrites or that chondrites were formed from precursor materials with different chemical histories from the precursors of irons. Some samples of Semarkona (LL3) and Murray (C2M) meteorites plot 4 to 6 percent above the iron meteorite isochron, well above the field delineated by other chondrites. Murray may have lost Re by aqueous leaching during its preterrestrial history. Semarkona could have experienced a similar loss of Re, but only slight aqueous alteration is evident in the meteorite. Therefore, the isotopic composition of Semarkona could reflect assembly of isotopically heterogeneous components subsequent to 4.55 billion years ago or Os isotopic heterogeneities in the primordial solar nebula.

  20. Nonlinear Saturable and Polarization-induced Absorption of Rhenium Disulfide

    PubMed Central

    Cui, Yudong; Lu, Feifei; Liu, Xueming

    2017-01-01

    Monolayer of transition metal dichalcogenides (TMDs), with lamellar structure as that of graphene, has attracted significant attentions in optoelectronics and photonics. Here, we focus on the optical absorption response of a new member TMDs, rhenium disulphide (ReS2) whose monolayer and bulk forms have the nearly identical band structures. The nonlinear saturable and polarization-induced absorption of ReS2 are investigated at near-infrared communication band beyond its bandgap. It is found that the ReS2-covered D-shaped fiber (RDF) displays the remarkable polarization-induced absorption, which indicates the different responses for transverse electric (TE) and transverse magnetic (TM) polarizations relative to ReS2 plane. Nonlinear saturable absorption of RDF exhibits the similar saturable fluence of several tens of μJ/cm2 and modulation depth of about 1% for ultrafast pulses with two orthogonal polarizations. RDF is utilized as a saturable absorber to achieve self-started mode-locking operation in an Er-doped fiber laser. The results broaden the operation wavelength of ReS2 from visible light to around 1550 nm, and numerous applications may benefit from the anisotropic and nonlinear absorption characteristics of ReS2, such as in-line optical polarizers, high-power pulsed lasers, and optical communication system. PMID:28053313

  1. Investigation of 186Re via radiative thermal-neutron capture on 185Re

    NASA Astrophysics Data System (ADS)

    Matters, D. A.; Lerch, A. G.; Hurst, A. M.; Szentmiklósi, L.; Carroll, J. J.; Detwiler, B.; Révay, Zs.; McClory, J. W.; McHale, S. R.; Firestone, R. B.; Sleaford, B. W.; Krtička, M.; Belgya, T.

    2016-05-01

    Partial γ -ray production cross sections and the total radiative thermal-neutron capture cross section for the 185Re(n ,γ ) 186Re reaction were measured using the Prompt Gamma Activation Analysis facility at the Budapest Research Reactor with an enriched 185Re target. The 186Re cross sections were standardized using well-known 35Cl(n ,γ )36Cl cross sections from irradiation of a stoichiometric natReCl3 target. The resulting cross sections for transitions feeding the 186Re ground state from low-lying levels below a cutoff energy of Ec=746 keV were combined with a modeled probability of ground-state feeding from levels above Ec to arrive at a total cross section of σ0=111 (6 ) b for radiative thermal-neutron capture on 185Re. A comparison of modeled discrete-level populations with measured transition intensities led to proposed revisions for seven tentative spin-parity assignments in the adopted level scheme for 186Re. Additionally, 102 primary γ rays were measured, including 50 previously unknown. A neutron-separation energy of Sn=6179.59 (5 ) keV was determined from a global least-squares fit of the measured γ -ray energies to the known 186Re decay scheme. The total capture cross section and separation energy results are comparable to earlier measurements of these values.

  2. Synthesis, crystal structure and magnetic properties of a novel heterobimetallic rhenium(IV)-dysprosium(III) chain.

    PubMed

    Pejo, Carolina; Guedes, Guilherme P; Novak, Miguel A; Speziali, Nivaldo L; Chiozzone, Raúl; Julve, Miguel; Lloret, Francesc; Vaz, Maria G F; González, Ricardo

    2015-06-08

    The use of the mononuclear rhenium(IV) precursor [ReBr5 (H2 pydc)](-) (H2 pydc=3,5-pyridinedicarboxylic acid) as a metalloligand towards dysprosium(III) afforded the first heterobimetallic Re(IV) -Dy(III) complex. Crystal structures and static and dynamic magnetic properties of both rhenium-containing species are reported herein. The 5d-4f compound shows an extended 1D structure and the AC magnetic measurements reveal frequency dependence at low temperature suggesting slow relaxation of the magnetization.

  3. Photo field-emission spectroscopy of optical transitions in the band structure of rhenium

    NASA Astrophysics Data System (ADS)

    Radoń, T.; Kleint, Ch.

    1984-09-01

    Photo field-emission (PFE) current-voltage curves of clean and barium covered rhenium have been determined with an argon ion laser and phase sensitive detection. Field strength and work function were obtained from Fowler-Nordheim plots of the field emission currents. According to a two-step PFE model the knees of the PFE characteristics are ascribed to optical transitions in the Brillouin zone near the Fermi level. Most of the observed excitations could be correlated to direct transitions in the rhenium band structure as calculated by Mattheiss including spin-orbit coupling.

  4. Tungsten-rhenium thin film thermocouples for SiC-based ceramic matrix composites.

    PubMed

    Tian, Bian; Zhang, Zhongkai; Shi, Peng; Zheng, Chen; Yu, Qiuyue; Jing, Weixuan; Jiang, Zhuangde

    2017-01-01

    A tungsten-rhenium thin film thermocouple is designed and fabricated, depending on the principle of thermal-electric effect caused by the high temperature. The characteristics of thin film thermocouples in different temperatures are investigated via numerical analysis and analog simulation. The working mechanism and thermo-electric features of the thermocouples are analyzed depending on the simulation results. Then the thin film thermocouples are fabricated and calibrated. The calibration results show that the thin film thermocouples based on the tungsten-rhenium material achieve ideal static characteristics and work well in the practical applications.

  5. Tungsten-rhenium thin film thermocouples for SiC-based ceramic matrix composites

    NASA Astrophysics Data System (ADS)

    Tian, Bian; Zhang, Zhongkai; Shi, Peng; Zheng, Chen; Yu, Qiuyue; Jing, Weixuan; Jiang, Zhuangde

    2017-01-01

    A tungsten-rhenium thin film thermocouple is designed and fabricated, depending on the principle of thermal-electric effect caused by the high temperature. The characteristics of thin film thermocouples in different temperatures are investigated via numerical analysis and analog simulation. The working mechanism and thermo-electric features of the thermocouples are analyzed depending on the simulation results. Then the thin film thermocouples are fabricated and calibrated. The calibration results show that the thin film thermocouples based on the tungsten-rhenium material achieve ideal static characteristics and work well in the practical applications.

  6. Effect of preliminary plastic deformation on the anodic behavior of molybdenum-rhenium alloys

    SciTech Connect

    Amirkhanova, N.A.; Tatarinova, O.M.

    1988-07-01

    Two molybdenum-rhenium alloys obtained by the method of vacuum melting and containing 20% and 40% rhenium were investigated for their anodic behavior following heating and bulk forging to develop different degrees of deformation. Their stationary potentials were determined in solutions of a number of sodium salts and polarization measurements were made using a rotating disk electrode. The rate of removal for different working-stress values was determined on an apparatus simulating the electrochemical sizing process. Surface microstructure was observed by metallographic microscopy. The increase in the rate of anodic dissolution of the alloys was determined to be correct for degrees of deformation to 10%.

  7. 40 CFR 18.5 - Qualifications for Environmental Protection Research Fellowships.

    Code of Federal Regulations, 2013 CFR

    2013-07-01

    ... Protection Research Fellowships. 18.5 Section 18.5 Protection of Environment ENVIRONMENTAL PROTECTION AGENCY GENERAL ENVIRONMENTAL PROTECTION RESEARCH FELLOWSHIPS AND SPECIAL RESEARCH CONSULTANTS FOR ENVIRONMENTAL PROTECTION § 18.5 Qualifications for Environmental Protection Research Fellowships. Scholastic and...

  8. 40 CFR 18.5 - Qualifications for Environmental Protection Research Fellowships.

    Code of Federal Regulations, 2014 CFR

    2014-07-01

    ... Protection Research Fellowships. 18.5 Section 18.5 Protection of Environment ENVIRONMENTAL PROTECTION AGENCY GENERAL ENVIRONMENTAL PROTECTION RESEARCH FELLOWSHIPS AND SPECIAL RESEARCH CONSULTANTS FOR ENVIRONMENTAL PROTECTION § 18.5 Qualifications for Environmental Protection Research Fellowships. Scholastic and...

  9. 40 CFR 18.5 - Qualifications for Environmental Protection Research Fellowships.

    Code of Federal Regulations, 2012 CFR

    2012-07-01

    ... Protection Research Fellowships. 18.5 Section 18.5 Protection of Environment ENVIRONMENTAL PROTECTION AGENCY GENERAL ENVIRONMENTAL PROTECTION RESEARCH FELLOWSHIPS AND SPECIAL RESEARCH CONSULTANTS FOR ENVIRONMENTAL PROTECTION § 18.5 Qualifications for Environmental Protection Research Fellowships. Scholastic and...

  10. 40 CFR 18.5 - Qualifications for Environmental Protection Research Fellowships.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ... Protection Research Fellowships. 18.5 Section 18.5 Protection of Environment ENVIRONMENTAL PROTECTION AGENCY GENERAL ENVIRONMENTAL PROTECTION RESEARCH FELLOWSHIPS AND SPECIAL RESEARCH CONSULTANTS FOR ENVIRONMENTAL PROTECTION § 18.5 Qualifications for Environmental Protection Research Fellowships. Scholastic and...

  11. 40 CFR 18.5 - Qualifications for Environmental Protection Research Fellowships.

    Code of Federal Regulations, 2011 CFR

    2011-07-01

    ... Protection Research Fellowships. 18.5 Section 18.5 Protection of Environment ENVIRONMENTAL PROTECTION AGENCY GENERAL ENVIRONMENTAL PROTECTION RESEARCH FELLOWSHIPS AND SPECIAL RESEARCH CONSULTANTS FOR ENVIRONMENTAL PROTECTION § 18.5 Qualifications for Environmental Protection Research Fellowships. Scholastic and...

  12. Gondola-shaped tetra-rhenium metallacycles modified evanescent wave infrared chemical sensors for selective determination of volatile organic compounds.

    PubMed

    Huang, Genin Gary; Lee, Chung-Jay; Tsai, Bo-Chan; Yang, Jyisy; Sathiyendiran, Malaichamy; Lu, Kuang-Lieh

    2011-07-15

    Water-stable and cavity-contained rhenium metallacycles were synthesized, and their ability to selectively interact with volatile organic compounds (VOCs) systematically studied using attenuated total reflection infrared (ATR-IR) spectroscopy. Integrating the unique properties of rhenium metallacycles into optical sensing technologies significantly improves selectivity in detecting aromatic compounds. To explore the interaction of rhenium metallacycles with VOCs, the surface of ATR sensing elements was modified with the synthesized rhenium metallacycles and used to detect VOCs. The results indicate that rhenium metallacycles have crown ether-like recognition sites, which can selectively interact with aromatic compounds, especially those bearing polar functional groups. The IR absorption bands of rhenium metallacycles shift significantly upon adsorption of aromatic VOCs, revealing a strong interaction between the tetra-rhenium metallacycles and guest aromatic compounds. Optimizing the thickness of the metallacycles coated on the surface of the sensing element led to rapid response in detection. The dynamic range of response was generally up to 30 mg/L with detection limits ca. 30 μg/L. Further studies of the effect of interferences indicate that recovery can be higher than 95% for most of the compounds tested. The results on the flow-cell device indicated that the performances were similar to a static detection system but the detection of VOCs can be largely simplified.

  13. NLC Positron Target Heating(LCC-0065)

    SciTech Connect

    Schultz, D

    2003-10-07

    The NLC requires an intense beam with a large number of positrons. These positrons are produced by a high energy electron beam impinging on a solid tungsten-rhenium alloy target. The particle shower that develops in the solid target deposits significant energy in the material, leading to target stresses and potentially to target damage. The stresses can be analyzed once the magnitude and extent of the energy deposition is known. This note details the modeling of the energy deposition using EGS, performed for the NLC and the SLC targets and for possible NLC targets made of copper or nickel instead of WRe.

  14. Luminescence modulations of rhenium tricarbonyl complexes induced by structural variations.

    PubMed

    Bertrand, Hélène C; Clède, Sylvain; Guillot, Régis; Lambert, François; Policar, Clotilde

    2014-06-16

    Octahedral d(6) low-spin Re(I) tricarbonyl complexes are of considerable interest as noninvasive imaging probes and have been deeply studied owing to their biological stability, low toxicity, large Stokes shifts, and long luminescence lifetimes. We reported recently the bimodal IR and luminescence imaging of a Re(I) tricarbonyl complex with a Pyta ligand (4-(2-pyridyl)-1,2,3-triazole) in cells and labeled such metal-carbonyl complexes SCoMPIs for single-core multimodal probes for imaging. Re(I) tricarbonyl complexes have unique photophysical properties allowing for their unequivocal detection in cells but also present some weaknesses such as a very low luminescence quantum yield in aqueous medium. Further optimizations would thus be desirable. We therefore developed new Re(I) tricarbonyl complexes prepared from different ancillary ligands. Complexes with benzothiadiazole-triazole ligands show interesting luminescent quantum yields in acetonitrile and may constitute valuable luminescent metal complexes in organic media. A series of complexes with bidentate 1-(2-quinolinyl)-1,2,3-triazole (Taquin) and 1-(2-pyridyl)-1,2,3-triazole (Tapy) ligands bearing various 4-substituted alkyl side chains has been designed and synthesized with efficient procedures. Their photophysical properties have been characterized in acetonitrile and in a H2O/DMSO (98/2) mixture and compared with those of the parent Quinta- and Pyta-based complexes. Tapy complexes bearing long alkyl chains show impressive enhancement of their luminescent properties relative to the parent Pyta complex. Theoretical calculations have been performed to further characterize this new class of rhenium tricarbonyl complexes. Preliminary cellular imaging studies in MDA-MB231 breast cancer cells reveal a strong increase in the luminescence signal in cells incubated with the Tapy complex substituted with a C12 alkyl chain. This study points out the interesting potential of the Tapy ligand in coordination chemistry

  15. Synthesis, crystal structure and magnetic properties of new indium rhenium and scandium rhenium oxides, In 6ReO 12 and Sc 6ReO 12

    NASA Astrophysics Data System (ADS)

    Mikhailova, D.; Ehrenberg, H.; Fuess, H.

    2006-12-01

    The new complex indium rhenium and scandium rhenium oxides, In 6ReO 12 and Sc 6ReO 12, have been synthesized as single phases in sealed silica tubes and by high-pressure high-temperature syntheses, and their crystal structures have been determined by single crystal X-ray diffraction.The compounds crystallize in a rhombohedral structure related to the distorted fluorite structure like Ln 6ReO 12 for some rare earth elements, S. G.: R-3, Z=3, aH= 9.248(2) Å, cH=8.720(2) Å for Sc 6ReO 12 and aH=9.492(1) Å, cH=8.933(1) Å for In 6ReO 12. A maximum in magnetization is observed for Sc 6ReO 12 at T( Mmax)=1.89(2) K, whereas ferromagnetic ordering is found for In 6ReO 12 by a pronounced increase in the temperature dependence of magnetization at TC=7.5(5) K. The magnetic moment per rhenium ion in In 6ReO 12 and Sc 6ReO 12 is 0.84(1) and 0.65(1) μB, respectively, derived from the paramagnetic regions.

  16. 2 x 2 Polyethylene Reflected and Moderated Highly Enriched Uranium System with Rhenium

    SciTech Connect

    A. Nichole Ellis; Jesson Hutchinson; John D. Bess; Dmitry N. Polyakov; Evgeny S. Glushkov; Alexey E. Glushkov

    2010-09-01

    The 2 × 2 array HEU-Re experiment was performed on the Planet universal critical assembly machine on November 4th, 2003 at the Los Alamos Critical Experiments Facility (LACEF) at Los Alamos National Laboratory (LANL). For this experiment, there were 10 ½ units, each full unit containing four HEU foils and two rhenium foils. The top unit contained only two HEU foils and two rhenium foils. A total of 42 HEU foils were used for this experiment. Rhenium is a desirable cladding material for space nuclear power applications. This experiment consisted of HEU foils interleaved with rhenium foils and is moderated and reflected by polyethylene plates. A unit consisted of a polyethylene plate, which has a recess for rhenium foils, and four HEU foils in a single layer in the top recess of each polyethylene plate. The Planet universal criticality assembly machine has been previously used in experiments containing HEU foils interspersed with SiO2 (HEU-MET-THERM-001), Al (HEU-MET-THERM-008), MgO (HEU-MET-THERM-009), Gd foils (HEU-MET-THERM-010), 2 × 2 × 26 Al (HEU-MET-THERM-012), Fe (HEU-MET-THERM-013 and HEU-MET-THERM-015), 2 × 2 × 23 SiO2 (HEU-MET-THERM-014), 2 × 2 × 11 hastalloy plates (HEU-MET-THERM-016), and concrete (HEU-MET-THERM-018). The 2 × 2 array of HEU-Re is considered acceptable for use as a benchmark critical experiment.

  17. Determination of rhenium content in molybdenite by ICP-MS after separation of the major matrix by solvent extraction with N-benzoyl-N-phenylhydroxalamine.

    PubMed

    Li, Jie; Zhong, Li-feng; Tu, Xiang-lin; Liang, Xi-rong; Xu, Ji-feng

    2010-05-15

    A simple and rapid analytical method for determining the concentration of rhenium in molybdenite for Re-Os dating was developed. The method used isotope dilution-inductively coupled plasma-mass spectrometry (ID-ICP-MS) after the removal of major matrix elements (e.g., Mo, Fe, and W) from Re by solvent extraction with N-benzoyl-N-phenylhydroxylamine (BPHA) in chloroform solution. The effect on extraction efficiency of parameters such as pH (HCl concentration), BPHA concentration, and extraction time were also assessed. Under the optimal experimental conditions, the validity of the separation method was accessed by measuring (187)Re/(185)Re values for a molybdenite reference material (JDC). The obtained values were in good agreement with previously measured values of the Re standard. The proposed method was applied to replicate Re-Os dating of JDC and seven samples of molybdenite from the Yuanzhuding large Cu-Mo porphyry deposit. The results demonstrate good precision and accuracy for the proposed method. The advantages of the method (i.e., simplicity, efficiency, short analysis time, and low cost) make it suitable for routine analysis.

  18. Potentials of the elevated circulating miR-185 level as a biomarker for early diagnosis of HBV-related liver fibrosis

    PubMed Central

    Li, Bin-bin; Li, Dong-liang; Chen, Chao; Liu, Bao-hai; Xia, Chun-yan; Wu, Han-jun; Wu, Chao-qun; Ji, Guo-qin; Liu, Su; Ni, Wu; Yao, Ding-kang; Zeng, Zhi-yu; Chen, Da-gui; Qin, Bao-dong; Xin, Xuan; Yan, Gang-li; Dan Tang; Liu, Hui-min; He, Jin; Yan, Hongli; Zhu, Wei-Jian; Yu, Hong-yu; Zhu, Liang

    2016-01-01

    Early diagnosis of liver fibrosis is critical for early intervention and prognosis of various chronic liver diseases. Conventional repeated histological assessment is impractical due to the associated invasiveness. In the current study, we evaluated circulating miR-185 as a potential biomarker to predict initiation and progression of liver fibrosis. We found that miR-185 was significantly up-regulated in blood specimens from patients with HBV-liver fibrosis and rats with liver fibrosis, the miR-185 levels were correlated with liver fibrosis progression, but not with the different viral loads in HBV-infected patients. miR-185 was observed in collagen deposition regions during advanced liver fibrosis. We found that differences in miR-185 levels facilitated the discrimination between early-staged or advanced-staged liver fibrosis and the healthy controls with high specificity, sensitivity, and likelihood ratio using receiver-operator characteristic analysis. miR-185 targeted SREBF1, and increased expression of COL1A1 and a-SMA genes that are hallmarks of liver fibrosis. Our data supported that circulating miR-185 levels could be used as potential biomarkers for the early diagnosis of liver fibrosis. PMID:27677421

  19. Trinuclear rhenium(III) halide clusters with carboxylate ligands

    NASA Astrophysics Data System (ADS)

    Dougan, Jeffrey Steven

    Four mono(carboxylato)trirhenium complexes and three bis(carboxylato)trirhenium complexes have been synthesized and characterized, principally by mass spectrometry, with supporting evidence from X-ray diffraction. These compounds represent the first trinuclear rhenium carboxylate complexes. The reactions generally proceed readily under comparatively mild conditions. Mass spectrometry has again proved its usefulness as a technique in the field of metal cluster chemistry, having provided the initial identification of the products of the reactions studied. These compounds provide a further base to which future mass spectra of metal cluster compounds can be compared. Re-examination of a reaction reported by Taha and Wilkinson has also cast considerable doubt onto the validity of a conversion widely reported in the literature that transforms (Re3Cl9) x into [Re2(O2CCH3)4Cl 2]. We believe that the literature result is a consequence of the purity of the metal precursor, and suggest that the starting material in the earlier work may have contained ReCl4 or ReCl5. The importance of mass spectrometry in the characterization of the new compounds synthesized in this project has led to a thorough study of calculated isotopic distributions. The information gathered suggests that for isotopically simple molecules, the choice of algorithm for computing an isotopic distribution is unimportant. However, it is important to compute the mass spectrum of an isotopically complex molecule using an algorithm that can, if desired, show the underlying isotopic fine structure of a peak of interest. In the last chapter of this thesis, the results of a project in chemistry education research are presented. Predicting the success of students in general chemistry has long been of interest to the chemistry education community, and several factors have been identified as contributing factors. An off-hand comment by a student inspired an examination of whether continuity with the same instructor for

  20. Testing of electroformed deposited iridium/powder metallurgy rhenium rockets

    NASA Technical Reports Server (NTRS)

    Reed, Brian D.; Dickerson, Robert

    1996-01-01

    High-temperature, oxidation-resistant chamber materials offer the thermal margin for high performance and extended lifetimes for radiation-cooled rockets. Rhenium (Re) coated with iridium (Ir) allow hours of operation at 2200 C on Earth-storable propellants. One process for manufacturing Ir/Re rocket chambers is the fabrication of Re substrates by powder metallurgy (PM) and the application of Ir coatings by using electroformed deposition (ED). ED Ir coatings, however, have been found to be porous and poorly adherent. The integrity of ED Ir coatings could be improved by densification after the electroforming process. This report summarizes the testing of two 22-N, ED Ir/PM Re rocket chambers that were subjected to post-deposition treatments in an effort to densify the Ir coating. One chamber was vacuum annealed, while the other chamber was subjected to hot isostatic pressure (HIP). The chambers were tested on gaseous oxygen/gaseous hydrogen propellants, at mixture ratios that simulated the oxidizing environments of Earth-storable propellants. ne annealed ED Ir/PM Re chamber was tested for a total of 24 firings and 4.58 hr at a mixture ratio of 4.2. After only 9 firings, the annealed ED Ir coating began to blister and spall upstream of the throat. The blistering and spalling were similar to what had been experienced with unannealed, as-deposited ED Ir coatings. The HIP ED Ir/PM Re chamber was tested for a total of 91 firings and 11.45 hr at mixture ratios of 3.2 and 4.2. The HIP ED Ir coating remained adherent to the Re substrate throughout testing; there were no visible signs of coating degradation. Metallography revealed, however, thinning of the HIP Ir coating and occasional pores in the Re layer upstream of the throat. Pinholes in the Ir coating may have provided a path for oxidation of the Re substrate at these locations. The HIP ED Ir coating proved to be more effective than vacuum annealed and as-deposited ED Ir. Further densification is still required to

  1. Evaluation of oxide-coated iridium-rhenium chambers

    NASA Technical Reports Server (NTRS)

    Reed, Brian D.

    1994-01-01

    Iridium-coated rhenium (Ir-Re) provides long life operation of radiation-cooled rockets at temperatures up to 2200 C. Ceramic oxide coatings could be used to increase Ir-Re rocket lifetimes and allow operation in highly oxidizing environments. Ceramic oxide coatings promise to serve as both thermal and diffusion barriers for the iridium layer. Seven ceramic oxide-coated Ir-Re, 22-N rocket chambers were tested with gaseous hydrogen/gaseous oxygen (GHz/G02) propellants. Five chambers had thick (over 10 mils), monolithic coatings of either hafnia (HfO2) or zirconia (ZrO2). Two chambers had coatings with thicknesses less than 5 mils. One of these chambers had a thin-walled coating of ZrO2 infiltrated with sol gel HfO2. The other chamber had a coating composed of an Ir-oxide composite. The purpose of this test program was to assess the ability of the oxide coatings to withstand the thermal shock of combustion initiation, adhere under repeated thermal cycling, and operate in aggressively oxidizing environments. All of the coatings survived the thermal shock of combustion and demonstrated operation at mixture ratios up to 11. Testing the Ir-oxide composite-coated chamber included over 29 min at mixture ratio 16. The thicker walled coatings provided the larger temperature drops across the oxide layer (up to 570 C), but were susceptible to macrocracking and eventual chipping at a stress concentrator. The cracks apparently resealed during firing, under compression of the oxide layer. The thinner walled coatings did not experience the macrocracking and chipping of the chambers that was seen with the thick, monolithic coatings. However, burn-throughs in the throat region did occur in both of the thin-walled chambers at mixture ratios well above stoichiometric. The burn-throughs were probably the result of oxygen diffusion through the oxide coating that allowed the underlying Ir and Re layers to be oxidized. The results of this test program indicated that the thin-walled oxide

  2. 185. Photographic copy of original construction drawing dated March 28, ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    185. Photographic copy of original construction drawing dated March 28, 1932 (from Record Group 115, Denver Branch of the National Archives, Denver). VOLUME CHANGE IN MASS CONCRETE; OWYHEE DAM CONCRETE RESEARCH FOR HOOVER DAM; CONTRACTION JOINT METER INSTALLATION. - Owyhee Dam, Across Owyhee River, Nyssa, Malheur County, OR

  3. 46 CFR 185.352 - Ventilation of gasoline machinery spaces.

    Code of Federal Regulations, 2012 CFR

    2012-10-01

    ... 46 Shipping 7 2012-10-01 2012-10-01 false Ventilation of gasoline machinery spaces. 185.352... machinery spaces. The mechanical exhaust for the ventilation of a gasoline machinery space, required by... sufficient to insure at least one complete change of air in the space served....

  4. 27 CFR 19.185 - Testing scale tanks for accuracy.

    Code of Federal Regulations, 2012 CFR

    2012-04-01

    ... 27 Alcohol, Tobacco Products and Firearms 1 2012-04-01 2012-04-01 false Testing scale tanks for... Requirements Tank Requirements § 19.185 Testing scale tanks for accuracy. (a) A proprietor who uses a scale tank for tax determination must ensure the accuracy of the scale through periodic testing. Testing...

  5. 27 CFR 19.185 - Testing scale tanks for accuracy.

    Code of Federal Regulations, 2013 CFR

    2013-04-01

    ... 27 Alcohol, Tobacco Products and Firearms 1 2013-04-01 2013-04-01 false Testing scale tanks for... Requirements Tank Requirements § 19.185 Testing scale tanks for accuracy. (a) A proprietor who uses a scale tank for tax determination must ensure the accuracy of the scale through periodic testing. Testing...

  6. 27 CFR 19.185 - Testing scale tanks for accuracy.

    Code of Federal Regulations, 2014 CFR

    2014-04-01

    ... 27 Alcohol, Tobacco Products and Firearms 1 2014-04-01 2014-04-01 false Testing scale tanks for... Requirements Tank Requirements § 19.185 Testing scale tanks for accuracy. (a) A proprietor who uses a scale tank for tax determination must ensure the accuracy of the scale through periodic testing. Testing...

  7. 27 CFR 19.185 - Testing scale tanks for accuracy.

    Code of Federal Regulations, 2011 CFR

    2011-04-01

    ... 27 Alcohol, Tobacco Products and Firearms 1 2011-04-01 2011-04-01 false Testing scale tanks for... Requirements Tank Requirements § 19.185 Testing scale tanks for accuracy. (a) A proprietor who uses a scale tank for tax determination must ensure the accuracy of the scale through periodic testing. Testing...

  8. 50 CFR 216.185 - Requirements for monitoring.

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    ... Low Frequency Active (SURTASS LFA sonar) Sonar § 216.185 Requirements for monitoring. (a) In order to mitigate the taking of marine mammals by SURTASS LFA sonar to the greatest extent practicable, the Holder... sunset); (2) Use low frequency passive SURTASS sonar to listen for vocalizing marine mammals; and (3)...

  9. 50 CFR 216.185 - Requirements for monitoring.

    Code of Federal Regulations, 2011 CFR

    2011-10-01

    ... Low Frequency Active (SURTASS LFA sonar) Sonar § 216.185 Requirements for monitoring. (a) In order to mitigate the taking of marine mammals by SURTASS LFA sonar to the greatest extent practicable, the Holder... sunset); (2) Use low frequency passive SURTASS sonar to listen for vocalizing marine mammals; and (3)...

  10. 46 CFR 185.280 - Official Logbook for foreign voyages.

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    ... 185.280 Shipping COAST GUARD, DEPARTMENT OF HOMELAND SECURITY (CONTINUED) SMALL PASSENGER VESSELS... seaman of the vessel, the nature of the illness or injury, and the medical treatment; (5) Each death on board, with the cause of death, and if a seaman, the information required by 46 U.S.C. 10702: (i)...

  11. 46 CFR 185.280 - Official Logbook for foreign voyages.

    Code of Federal Regulations, 2013 CFR

    2013-10-01

    ... 185.280 Shipping COAST GUARD, DEPARTMENT OF HOMELAND SECURITY (CONTINUED) SMALL PASSENGER VESSELS... seaman of the vessel, the nature of the illness or injury, and the medical treatment; (5) Each death on board, with the cause of death, and if a seaman, the information required by 46 U.S.C. 10702: (i)...

  12. 46 CFR 185.280 - Official Logbook for foreign voyages.

    Code of Federal Regulations, 2012 CFR

    2012-10-01

    ... 185.280 Shipping COAST GUARD, DEPARTMENT OF HOMELAND SECURITY (CONTINUED) SMALL PASSENGER VESSELS... seaman of the vessel, the nature of the illness or injury, and the medical treatment; (5) Each death on board, with the cause of death, and if a seaman, the information required by 46 U.S.C. 10702: (i)...

  13. 46 CFR 185.280 - Official Logbook for foreign voyages.

    Code of Federal Regulations, 2011 CFR

    2011-10-01

    ... 185.280 Shipping COAST GUARD, DEPARTMENT OF HOMELAND SECURITY (CONTINUED) SMALL PASSENGER VESSELS... seaman of the vessel, the nature of the illness or injury, and the medical treatment; (5) Each death on board, with the cause of death, and if a seaman, the information required by 46 U.S.C. 10702: (i)...

  14. 46 CFR 185.280 - Official Logbook for foreign voyages.

    Code of Federal Regulations, 2014 CFR

    2014-10-01

    ... 185.280 Shipping COAST GUARD, DEPARTMENT OF HOMELAND SECURITY (CONTINUED) SMALL PASSENGER VESSELS... seaman of the vessel, the nature of the illness or injury, and the medical treatment; (5) Each death on board, with the cause of death, and if a seaman, the information required by 46 U.S.C. 10702: (i)...

  15. 37 CFR 1.85 - Corrections to drawings.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ... 37 Patents, Trademarks, and Copyrights 1 2010-07-01 2010-07-01 false Corrections to drawings. 1.85... Corrections to drawings. (a) A utility or plant application will not be placed on the files for examination... admitted for examination. (b) The Office will not release drawings for purposes of correction....

  16. 37 CFR 1.85 - Corrections to drawings.

    Code of Federal Regulations, 2011 CFR

    2011-07-01

    ... 37 Patents, Trademarks, and Copyrights 1 2011-07-01 2011-07-01 false Corrections to drawings. 1.85... Corrections to drawings. (a) A utility or plant application will not be placed on the files for examination... admitted for examination. (b) The Office will not release drawings for purposes of correction....

  17. 46 CFR 108.185 - Ventilation for enclosed classified locations.

    Code of Federal Regulations, 2013 CFR

    2013-10-01

    ... DRILLING UNITS DESIGN AND EQUIPMENT Construction and Arrangement Ventilation § 108.185 Ventilation for enclosed classified locations. (a) The ventilation system for each enclosed classified location must be... 46 Shipping 4 2013-10-01 2013-10-01 false Ventilation for enclosed classified locations....

  18. 46 CFR 108.185 - Ventilation for enclosed classified locations.

    Code of Federal Regulations, 2012 CFR

    2012-10-01

    ... DRILLING UNITS DESIGN AND EQUIPMENT Construction and Arrangement Ventilation § 108.185 Ventilation for enclosed classified locations. (a) The ventilation system for each enclosed classified location must be... 46 Shipping 4 2012-10-01 2012-10-01 false Ventilation for enclosed classified locations....

  19. 46 CFR 108.185 - Ventilation for enclosed classified locations.

    Code of Federal Regulations, 2014 CFR

    2014-10-01

    ... DRILLING UNITS DESIGN AND EQUIPMENT Construction and Arrangement Ventilation § 108.185 Ventilation for enclosed classified locations. (a) The ventilation system for each enclosed classified location must be... 46 Shipping 4 2014-10-01 2014-10-01 false Ventilation for enclosed classified locations....

  20. 16 CFR 1.85 - Final environmental impact statements.

    Code of Federal Regulations, 2010 CFR

    2010-01-01

    ... 16 Commercial Practices 1 2010-01-01 2010-01-01 false Final environmental impact statements. 1.85... Final environmental impact statements. (a) After the close of the comment period, the Bureau responsible for the matter will consider the comments received on the draft environmental impact statement...

  1. 40 CFR 792.185 - Reporting of study results.

    Code of Federal Regulations, 2013 CFR

    2013-07-01

    ... 40 Protection of Environment 33 2013-07-01 2013-07-01 false Reporting of study results. 792.185... study results. (a) A final report shall be prepared for each study and shall include, but not necessarily be limited to, the following: (1) Name and address of the facility performing the study and...

  2. 40 CFR 792.185 - Reporting of study results.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ... 40 Protection of Environment 31 2010-07-01 2010-07-01 true Reporting of study results. 792.185... study results. (a) A final report shall be prepared for each study and shall include, but not necessarily be limited to, the following: (1) Name and address of the facility performing the study and...

  3. 16 CFR 1.85 - Final environmental impact statements.

    Code of Federal Regulations, 2011 CFR

    2011-01-01

    ... 16 Commercial Practices 1 2011-01-01 2011-01-01 false Final environmental impact statements. 1.85... Final environmental impact statements. (a) After the close of the comment period, the Bureau responsible for the matter will consider the comments received on the draft environmental impact statement...

  4. 16 CFR 1.85 - Final environmental impact statements.

    Code of Federal Regulations, 2012 CFR

    2012-01-01

    ... 16 Commercial Practices 1 2012-01-01 2012-01-01 false Final environmental impact statements. 1.85... Final environmental impact statements. (a) After the close of the comment period, the Bureau responsible for the matter will consider the comments received on the draft environmental impact statement...

  5. 16 CFR 1.85 - Final environmental impact statements.

    Code of Federal Regulations, 2014 CFR

    2014-01-01

    ... 16 Commercial Practices 1 2014-01-01 2014-01-01 false Final environmental impact statements. 1.85... Final environmental impact statements. (a) After the close of the comment period, the Bureau responsible for the matter will consider the comments received on the draft environmental impact statement...

  6. 16 CFR 1.85 - Final environmental impact statements.

    Code of Federal Regulations, 2013 CFR

    2013-01-01

    ... 16 Commercial Practices 1 2013-01-01 2013-01-01 false Final environmental impact statements. 1.85... Final environmental impact statements. (a) After the close of the comment period, the Bureau responsible for the matter will consider the comments received on the draft environmental impact statement...

  7. 12 CFR 18.5 - Alternative annual disclosure statements.

    Code of Federal Regulations, 2013 CFR

    2013-01-01

    ... 12 Banks and Banking 1 2013-01-01 2013-01-01 false Alternative annual disclosure statements. 18.5... national bank having a class of securities registered pursuant to section 12 of the Securities Exchange Act...'s consolidated financial statements on Form FR Y-9c pursuant to Regulation Y of the Federal...

  8. 12 CFR 18.5 - Alternative annual disclosure statements.

    Code of Federal Regulations, 2012 CFR

    2012-01-01

    ... 12 Banks and Banking 1 2012-01-01 2012-01-01 false Alternative annual disclosure statements. 18.5... national bank having a class of securities registered pursuant to section 12 of the Securities Exchange Act...'s consolidated financial statements on Form FR Y-9c pursuant to Regulation Y of the Federal...

  9. 12 CFR 18.5 - Alternative annual disclosure statements.

    Code of Federal Regulations, 2011 CFR

    2011-01-01

    ... 12 Banks and Banking 1 2011-01-01 2011-01-01 false Alternative annual disclosure statements. 18.5... national bank having a class of securities registered pursuant to section 12 of the Securities Exchange Act...'s consolidated financial statements on Form FR Y-9c pursuant to Regulation Y of the Federal...

  10. 18 CFR 367.1850 - Account 185, Temporary facilities.

    Code of Federal Regulations, 2010 CFR

    2010-04-01

    ... ACT Balance Sheet Chart of Accounts Deferred Debits § 367.1850 Account 185, Temporary facilities. This... facilities. 367.1850 Section 367.1850 Conservation of Power and Water Resources FEDERAL ENERGY REGULATORY COMMISSION, DEPARTMENT OF ENERGY REGULATIONS UNDER THE PUBLIC UTILITY HOLDING COMPANY ACT OF 2005,...

  11. 21 CFR 137.185 - Enriched self-rising flour.

    Code of Federal Regulations, 2011 CFR

    2011-04-01

    ....185 Food and Drugs FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES (CONTINUED) FOOD FOR HUMAN CONSUMPTION CEREAL FLOURS AND RELATED PRODUCTS Requirements for Specific Standardized... conforms to the definition and standard of identity, and is subject to the requirements for label...

  12. 49 CFR 572.185 - Thorax (upper torso) assembly.

    Code of Federal Regulations, 2011 CFR

    2011-10-01

    ... Impact Crash Test Dummy, 50th Percentile Adult Male § 572.185 Thorax (upper torso) assembly. (a) The... for a full-body thorax impact test. (b) Individual rib drop test. For purposes of this test, the rib... paragraphs (b)(2)(i)(A) and (B) of this section, with the deflection measurements made with the internal...

  13. 49 CFR 572.185 - Thorax (upper torso) assembly.

    Code of Federal Regulations, 2014 CFR

    2014-10-01

    ... Impact Crash Test Dummy, 50th Percentile Adult Male § 572.185 Thorax (upper torso) assembly. (a) The... for a full-body thorax impact test. (b) Individual rib drop test. For purposes of this test, the rib... paragraphs (b)(2)(i)(A) and (B) of this section, with the deflection measurements made with the internal...

  14. 49 CFR 572.185 - Thorax (upper torso) assembly.

    Code of Federal Regulations, 2013 CFR

    2013-10-01

    ... Impact Crash Test Dummy, 50th Percentile Adult Male § 572.185 Thorax (upper torso) assembly. (a) The... for a full-body thorax impact test. (b) Individual rib drop test. For purposes of this test, the rib... paragraphs (b)(2)(i)(A) and (B) of this section, with the deflection measurements made with the internal...

  15. 49 CFR 572.185 - Thorax (upper torso) assembly.

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    ... Impact Crash Test Dummy, 50th Percentile Adult Male § 572.185 Thorax (upper torso) assembly. (a) The thorax assembly of the dummy must meet the requirements of both (b) and (c) of this section. Section 572... torso assembly shown in drawing 175-4000. For this full-body thorax impact test, the dummy is tested...

  16. 46 CFR 185.352 - Ventilation of gasoline machinery spaces.

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    ... 46 Shipping 7 2010-10-01 2010-10-01 false Ventilation of gasoline machinery spaces. 185.352... machinery spaces. The mechanical exhaust for the ventilation of a gasoline machinery space, required by... sufficient to insure at least one complete change of air in the space served....

  17. 12 CFR 18.5 - Alternative annual disclosure statements.

    Code of Federal Regulations, 2010 CFR

    2010-01-01

    ... FINANCIAL AND OTHER INFORMATION BY NATIONAL BANKS § 18.5 Alternative annual disclosure statements. The § 18... to be elected; (b) In the case of a national bank with audited financial statements, by those...'s consolidated financial statements on Form FR Y-9c pursuant to Regulation Y of the Federal...

  18. Rhenium-coated glass beads for intracolonic administration attenuate TNBS-induced colitis in mice: Proof-of-Concept Study.

    PubMed

    Siczek, Krzysztof; Zatorski, Hubert; Pawlak, Wojciech; Fichna, Jakub

    2015-01-01

    In search for novel effective treatments in inflammatory bowel diseases, a new strategy employing glass beads coated with rhenium nanolayer has been developed and validated in the mouse model of 2,4,6-trinitrobenzene sulfonic acid (TNBS)-induced colitis. Briefly, mice were randomly divided into 5 experimental groups: control (vehicle alone, Group 1); control treated with rhenium-coated glass beads (Group 2); TNBS (Group 3); TNBS treated with rhenium-coated glass beads (Group 4); and TNBS treated with uncoated glass beads (Group 5). Mice from Group 2, 4 and 5 were treated with respective beads (once daily, 5 beads / animal, i.c.) between D3-D6 post-TNBS/vehicle and evaluation of colonic damage was performed on D7, based on macroscopic scoring and clinical parameters. Severe colonic inflammation developed in post-TNBS mice (Group 3) [P <0.001 vs. control (Group 1) for macroscopic score], which was significantly attenuated by treatment with rhenium-coated glass beads (Group 4) [P <0.01 vs. TNBS (Group 3), for macroscopic score]. Neither rhenium-coated glass beads had any effect in control animals (Group 2), nor uncoated glass beads influenced TNBS-induced colitis (Group 5). In conclusion, a novel and attractive strategy for the treatment of colonic inflammation has been proposed; therapy with rhenium-coated glass beads already proved effective in the mouse model of TNBS-induced colitis, now requires further characterization in clinical conditions.

  19. A first-principles model for anomalous segregation in dilute ternary tungsten-rhenium-vacancy alloys.

    PubMed

    Wróbel, J S; Nguyen-Manh, D; Kurzydłowski, K J; Dudarev, S L

    2017-04-12

    The occurrence of segregation in dilute alloys under irradiation is a highly unusual phenomenon that has recently attracted attention, stimulated by the interest in the fundamental properties of alloys as well as by their applications. The fact that solute atoms segregate in alloys that, according to equilibrium thermodynamics, should exhibit full solubility, has significant practical implications, as the formation of precipitates strongly affects physical and mechanical properties of alloys. A lattice Hamiltonian, generalizing the so-called 'ABV' Ising model and including collective many-body inter-atomic interactions, has been developed to treat rhenium solute atoms and vacancies in tungsten as components of a ternary alloy. The phase stability of W-Re-vacancy alloys is assessed using a combination of density functional theory (DFT) calculations and cluster expansion (CE) simulations. The accuracy of CE parametrization is evaluated against the DFT data, and the cross-validation error is found to be less than 4.2 meV/atom. The free energy of W-Re-vacancy ternary alloys is computed as a function of temperature using quasi-canonical Monte Carlo simulations, using effective two, three and four-body interactions. In the low rhenium concentration range (<5 at.[Formula: see text]Re), solute segregation is found to occur in the form of voids decorated by Re atoms. These vacancy-rhenium clusters remain stable over a broad temperature range from 800 K to 1600 K. At lower temperatures, simulations predict the formation of Re-rich rhenium-vacancy clusters taking the form of sponge-like configurations that contain from 30 to 50 at.[Formula: see text]Re. The anomalous vacancy-mediated segregation of Re atoms in W can be rationalized by analyzing binding energy dependence as a function of Re to vacancy ratio as well as chemical Re-W and Re-vacancy interactions and short-range order parameters. DFT calculations show that rhenium-vacancy binding energies can be as high as 1

  20. Luminescent Rhenium(I) and Iridium(III) Polypyridine Complexes as Biological Probes, Imaging Reagents, and Photocytotoxic Agents.

    PubMed

    Lo, Kenneth Kam-Wing

    2015-12-15

    in the cytotoxic activity, cellular uptake, and bioimaging applications of these complexes. Additionally, we and other research groups have demonstrated that many transition metal complexes have facile cellular uptake and organelle-localization properties and that their cytotoxic activity can be readily controlled. For example, complexes that can target the nucleus, nucleolus, mitochondria, lysosomes, endoplasmic reticulum, and Golgi apparatus have been identified. We anticipate that this selective localization property can be utilized in the development of intracellular sensors and bioimaging reagents. Thus, we have functionalized luminescent rhenium(I) and iridium(III) polypyridine complexes with various pendants, including molecule-binding moieties, sugar molecules, bioorthogonal functional groups, and polymeric chains such as poly(ethylene glycol) and polyethylenimine, and examined their potentials as biological reagents. This Account describes our design of luminescent rhenium(I) and iridium(III) polypyridine complexes and explains how they can serve as a new generation of biological reagents for diagnostic and therapeutic applications.

  1. A chiral rhenium complex with predicted high parity violation effects: synthesis, stereochemical characterization by VCD spectroscopy and quantum chemical calculations.

    PubMed

    Saleh, Nidal; Zrig, Samia; Roisnel, Thierry; Guy, Laure; Bast, Radovan; Saue, Trond; Darquié, Benoît; Crassous, Jeanne

    2013-07-14

    With their rich electronic, vibrational, rotational and hyperfine structure, molecular systems have the potential to play a decisive role in precision tests of fundamental physics. For example, electroweak nuclear interactions should cause small energy differences between the two enantiomers of chiral molecules, a signature of parity symmetry breaking. Enantioenriched oxorhenium(VII) complexes S-(-)- and R-(+)-3 bearing a chiral 2-methyl-1-thio-propanol ligand have been prepared as potential candidates for probing molecular parity violation effects via high resolution laser spectroscopy of the Re=O stretching. Although the rhenium atom is not a stereogenic centre in itself, experimental vibrational circular dichroism (VCD) spectra revealed a surrounding chiral environment, evidenced by the Re=O bond stretching mode signal. The calculated VCD spectrum of the R enantiomer confirmed the position of the sulfur atom cis to the methyl, as observed in the solid-state X-ray crystallographic structure, and showed the presence of two conformers of comparable stability. Relativistic quantum chemistry calculations indicate that the vibrational shift between enantiomers due to parity violation is above the target sensitivity of an ultra-high resolution infrared spectroscopy experiment under active preparation.

  2. The process development of laser surface modification of commercially pure titanium (Grade 2) with rhenium

    NASA Astrophysics Data System (ADS)

    Kobiela, K.; Smolina, I.; Dziedzic, R.; Szymczyk, P.; Kurzynowski, T.; Chlebus, E.

    2016-12-01

    The paper presents the results of the process development of laser surface modification of commercially pure titanium with rhenium. The criterion of the successful/optimal process is the repetitive geometry of the surface, characterized by predictable and repetitive chemical composition over its entire surface as well as special mechanical properties (hardness and wear resistance). The analysis of surface geometry concluded measurements of laser penetration depth and heat affected zone (HAZ), the width of a single track as well as width of a clad. The diode laser installed on the industrial robot carried out the laser treatment. This solution made possible the continuous supply of powder to the substrate during the process. The aim of an investigation is find out the possibility of improving the tribological characteristics of the surface due to the rhenium alloying. The verification of the surface properties (tribological) concluded geometry measurements, microstructure observation, hardness tests and evaluation of wear resistance.

  3. Large enhancement of superconducting transition temperature in single-element superconducting rhenium by shear strain.

    PubMed

    Mito, Masaki; Matsui, Hideaki; Tsuruta, Kazuki; Yamaguchi, Tomiko; Nakamura, Kazuma; Deguchi, Hiroyuki; Shirakawa, Naoki; Adachi, Hiroki; Yamasaki, Tohru; Iwaoka, Hideaki; Ikoma, Yoshifumi; Horita, Zenji

    2016-11-04

    Finding a physical approach for increasing the superconducting transition temperature (Tc) is a challenge in the field of material science. Shear strain effects on the superconductivity of rhenium were investigated using magnetic measurements, X-ray diffraction, transmission electron microscopy, and first-principles calculations. A large shear strain reduces the grain size and simultaneously expands the unit cells, resulting in an increase in Tc. Here we show that this shear strain approach is a new method for enhancing Tc and differs from that using hydrostatic strain. The enhancement of Tc is explained by an increase in net electron-electron coupling rather than a change in the density of states near the Fermi level. The shear strain effect in rhenium could be a successful example of manipulating Bardeen-Cooper-Schrieffer-type Cooper pairing, in which the unit cell volumes are indeed a key parameter.

  4. Production and investigation into properties of high-pure rhenium fluorides

    NASA Astrophysics Data System (ADS)

    Vybyvanets, V. I.; Kosukhin, A. V.; Cherenkov, A. V.; Shilkin, G. S.

    2016-01-01

    Two products of synthesis were obtained: synthesis product at a fluorination temperature of 300°C, synthesis product at a fluorination temperature of 600°C. Two source products were separated and rectified during this work. Monofraction of rhenium hexafluorides and heptafluorides were obtained. The temperatures of liquids in the system ReF6 - ReF7 were determined. Liquid-vapor equilibrium in the system was investigated. Viscosity and surface-tension at the liquid-to-vapor boundary are measured for liquid ReF6 and ReF7.A promising method of tungsten-rhenium alloys making is a gas-phase precipitation, namely joint hydrogen reduction of these metals fluorides.

  5. Equations for determining CVD tungsten-rhenium alloy composition and plating rate

    SciTech Connect

    Klingsporn, P.E.

    1987-04-01

    The composition and plating rate of CVD tungsten-rhenium alloy, formed by hydrogen reduction of a tungsten and rhenium metal hexafluoride gas mixture on a heated substrate, depend on the substrate temperature, hydrogen gas flow, metal fluoride gas flow, and the pressure. An equation was derived that allows the alloy composition to be calculated for any combination of the variables, based on the measured composition for one set of the variables. Also, equations were derived from which the W-Re alloy plating rate can be calculated in terms of the measured rate and composition at one set of the variables, or, in terms of the measured rates at two sets of the variables, without knowledge of the composition. W-Re alloy compositions and plating rates calculated with the equations were compared with experimental data.

  6. Rhenium-osmium-isotope constraints on the age of iron meteorites

    NASA Technical Reports Server (NTRS)

    Horan, M. F.; Morgan, J. W.; Walker, R. J.; Grossman, J. N.

    1992-01-01

    Rhenium and osmium concentrations and the osmium isotopic compositions of iron meteorites were determined by negative thermal ionization mass spectrometry. Data for the IIA iron meteorites define an isochron with an uncertainty of approximately +/-31 million years for meteorites about 4500 million years old. Although an absolute rhenium-osmium closure age for this iron group cannot be as precisely constrained because of uncertainty in the decay constant of Re-187, an age of 4460 million years ago is the minimum permitted by combined uncertainties. These age constraints imply that the parent body of the IIAB magmatic irons melted and subsequently cooled within 100 million years after the formation of the oldest portions of chondrites. Other iron meteorites plot above the IIA isochron, indicating that the planetary bodies represented by these iron groups may have cooled significantly later than the parent body of the IIA irons.

  7. Large enhancement of superconducting transition temperature in single-element superconducting rhenium by shear strain

    NASA Astrophysics Data System (ADS)

    Mito, Masaki; Matsui, Hideaki; Tsuruta, Kazuki; Yamaguchi, Tomiko; Nakamura, Kazuma; Deguchi, Hiroyuki; Shirakawa, Naoki; Adachi, Hiroki; Yamasaki, Tohru; Iwaoka, Hideaki; Ikoma, Yoshifumi; Horita, Zenji

    2016-11-01

    Finding a physical approach for increasing the superconducting transition temperature (Tc) is a challenge in the field of material science. Shear strain effects on the superconductivity of rhenium were investigated using magnetic measurements, X-ray diffraction, transmission electron microscopy, and first-principles calculations. A large shear strain reduces the grain size and simultaneously expands the unit cells, resulting in an increase in Tc. Here we show that this shear strain approach is a new method for enhancing Tc and differs from that using hydrostatic strain. The enhancement of Tc is explained by an increase in net electron–electron coupling rather than a change in the density of states near the Fermi level. The shear strain effect in rhenium could be a successful example of manipulating Bardeen–Cooper–Schrieffer-type Cooper pairing, in which the unit cell volumes are indeed a key parameter.

  8. Rhenium-osmium isotope constraints on the age of iron meteorites

    USGS Publications Warehouse

    Horan, M.F.; Morgan, J.W.; Walker, R.J.; Grossman, J.N.

    1992-01-01

    Rhenium and osmium concentrations and the osmium isotopic compositions of iron meteorites were determined by negative thermal ionization mass spectrometry. Data for the IIA iron meteorites define an isochron with an uncertainty of approximately ??31 million years for meteorites ???4500 million years old. Although an absolute rhenium-osmium closure age for this iron group cannot be as precisely constrained because of uncertainty in the decay constant of 187Re, an age of 4460 million years ago is the minimum permitted by combined uncertainties. These age constraints imply that the parent body of the IIAB magmatic irons melted and subsequently cooled within 100 million years after the formation of the oldest portions of chondrites. Other iron meteorites plot above the IIA isochron, indicating that the planetary bodies represented by these iron groups may have cooled significantly later than the parent body of the IIA irons.

  9. Equation of state of rhenium and application for ultra high pressure calibration

    SciTech Connect

    Anzellini, Simone; Dewaele, Agnès; Occelli, Florent; Loubeyre, Paul; Mezouar, Mohamed

    2014-01-28

    The isothermal equation of state of rhenium has been measured by powder X-ray diffraction experiments up to 144 GPa at room temperature in a diamond anvil cell. A helium pressure transmitting medium was used to minimize the non-hydrostatic stress on the sample. The fit of pressure-volume data yields a bulk modulus K{sub 0} = 352.6 GPa and a pressure derivative of the bulk modulus K′{sub 0}=4.56. This equation of state differs significantly from a recent determination [Dubrovinsky et al., Nat. Commun. 3, 1163 (2012)], giving here a lower pressure at a given volume. The possibility of using rhenium gasket X-ray diffraction signal, with the present equation of state, to evaluate multi-Mbar pressures in the chamber of diamond anvil cells is discussed.

  10. Crystallization and rhenium MAD phasing of the acyl-homoserinelactone synthase EsaI

    SciTech Connect

    Watson, W.T.; Murphy IV, Frank V.; Gould, Ty A.; Jambeck, Per; Val, Dale L.; Cronan, Jr., John E.; Beck von Bodman, Susan; Churchill, Mair E.A.

    2009-04-22

    Acyl-homoserine-L-lactones (AHLs) are diffusible chemical signals that are required for virulence of many Gram-negative bacteria. AHLs are produced by AHL synthases from two substrates, S-adenosyl-L-methionine and acyl-acyl carrier protein. The AHL synthase EsaI, which is homologous to the AHL synthases from other pathogenic bacterial species, has been crystallized in the primitive tetragonal space group P4{sub 3}, with unit-cell parameters a = b = 66.40, c = 47.33 {angstrom}. The structure was solved by multiple-wavelength anomalous diffraction with a novel use of the rhenium anomalous signal. The rhenium-containing structure has been refined to a resolution of 2.5 {angstrom} and the perrhenate ion binding sites and liganding residues have been identified.

  11. Slip casting and extruding shapes of rhenium with metal oxide additives. 1: Feasibility demonstration

    NASA Technical Reports Server (NTRS)

    Barr, F. A.; Page, R. J.

    1986-01-01

    The feasibility of fabricating small rhenium parts with metal oxide additives by means of slip casting and extrusion techniques is described. The metal oxides, ZrO2 and HfO2 were stabilized into the cubic phase with Y2O3. Additions of metal oxide to the rhenium of up to 15 weight percent were used. Tubes of 17 mm diameter with 0.5 mm walls were slip cast by adapting current ceramic oxide techniques. A complete cast double conical nozzle demonstrated the ability to meet shapes and tolerances. Extrusion of meter long tubing lengths of 3.9 mm o.d. x 2.3 mm i.d. final dimension is documented. Sintering schedules are presented to produce better than 95% of theoretical density parts. Finished machining was found possible were requried by electric discharge machining and diamond grinding.

  12. Alkoxy bridged binuclear rhenium (I) complexes as a potential sensor for β-amyloid aggregation.

    PubMed

    Sathish, Veerasamy; Babu, Eththilu; Ramdass, Arumugam; Lu, Zong-Zhan; Velayudham, Murugesan; Thanasekaran, Pounraj; Lu, Kuang-Lieh; Rajagopal, Seenivasan

    2014-12-01

    Alkoxy bridged binuclear rhenium(I) complexes are used as a probe for the selective and sensitive detection of aggregation of β-amyloid fibrils that are consorted with Alzheimer's disease (AD). The strong binding of the complexes is affirmed by the fluorescence enhancement and calculated binding constant value in the order of 10(5)M(-1) is obtained from the Scatchard plots. The binding of β-amyloid can be attributed to π-π stacking interaction of naphthalene moiety present in rhenium(I) complexes, and it is supported by docking studies. The selectivity is quite high towards other proteins and the formation of fibrils can be observed in the range of 30-40 nm through the AFM and TEM techniques.

  13. Liquid extraction of rhenium(VII) and molybdenum(VI) with trialkylphosphine oxide from acidic solutions

    NASA Astrophysics Data System (ADS)

    Travkin, V. F.; Palant, A. A.

    2012-01-01

    The liquid extraction of rhenium(VII) and molybdenum(VI) ions from sulfuric, hydrochloric, and nitric acid media is studied in the temperature range from 20 to 40°C using trialkylphosphine oxide in kerosene as an extracting agent. The maximum separation of these metals is attained when they are extracted from solutions of 1.0-2.0 M H2SO4 (the duration of intense phase mixing was 3-5 min). The enthalpy of the studied process is estimated to be Δ H = -32.32 kJ/mol for molybdenum and -51.52 kJ/mol for rhenium. The chemical aspects of the extraction process studied are discussed.

  14. Large enhancement of superconducting transition temperature in single-element superconducting rhenium by shear strain

    PubMed Central

    Mito, Masaki; Matsui, Hideaki; Tsuruta, Kazuki; Yamaguchi, Tomiko; Nakamura, Kazuma; Deguchi, Hiroyuki; Shirakawa, Naoki; Adachi, Hiroki; Yamasaki, Tohru; Iwaoka, Hideaki; Ikoma, Yoshifumi; Horita, Zenji

    2016-01-01

    Finding a physical approach for increasing the superconducting transition temperature (Tc) is a challenge in the field of material science. Shear strain effects on the superconductivity of rhenium were investigated using magnetic measurements, X-ray diffraction, transmission electron microscopy, and first-principles calculations. A large shear strain reduces the grain size and simultaneously expands the unit cells, resulting in an increase in Tc. Here we show that this shear strain approach is a new method for enhancing Tc and differs from that using hydrostatic strain. The enhancement of Tc is explained by an increase in net electron–electron coupling rather than a change in the density of states near the Fermi level. The shear strain effect in rhenium could be a successful example of manipulating Bardeen–Cooper–Schrieffer-type Cooper pairing, in which the unit cell volumes are indeed a key parameter. PMID:27811983

  15. Electrotransport and diffusivity of molybdenum, rhenium, tungsten, and zirconium in beta-thorium

    NASA Technical Reports Server (NTRS)

    Schmidt, F. A.; Beck, M. S.; Rehbein, D. K.; Conzemius, R. J.; Carlson, O. N.

    1984-01-01

    The electric mobilities, diffusivities, and effective valences were determined for molybdenum, rhenium, tungsten, and zirconium in beta-thorium. All four solutes migrated in the same direction as the electron flow. Rhenium and molybdenum were found to be very mobile, with tungsten somewhat slower. Zirconium was found to move at a rate near that of the self-diffusion of beta-thorium, viz., about 10 to the -11th sq m/s at 1500 C. The electromigration velocities showed a similar trend. A comparison was made between experimental data obtained by scanning laser mass spectrometry and theoretical transport equations for two purification experiments. Good agreement was obtained with both the concentration profile predicted by DeGroot and the purification ratio predicted by Verhoeven.

  16. Nanograined Net-Shaped Fabrication of Rhenium Components by EB-PVD

    SciTech Connect

    Singh, Jogender; Wolfe, Douglas E.

    2004-02-04

    Cost-effective net-shaped forming components have brought considerable interest into DoD, NASA and DoE. Electron beam physical vapor deposition (EB-PVD) offers flexibility in forming net-shaped components with tailored microstructure and chemistry. High purity rhenium (Re) components including rhenium-coated graphite balls, Re- plates and tubes have been successfully manufactured by EB-PVD. EB-PVD Re components exhibited sub-micron and nano-sized grains with high hardness and strength as compared to CVD. It is estimated that the cost of Re components manufactured by EB-PVD would be less than the current CVD and powder-HIP Technologies.

  17. Sulfur-bonded thiophenes in organometallic rhenium complexes and adsorption of isocyanides on gold

    SciTech Connect

    Robertson, Mitchell Joe

    1993-08-01

    This dissertation contains results of research conducted in two different areas: (1) organometallic synthesis and reactivity, and (2) organometallic surface chemistry. In the synthesis and reactivity studies, sulfur coordination of thiophene and benzo[b]thiophene to the metal center in organometallic rhenium complexes is examined. In the surface chemistry studies, diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) is used to analyze the adsorption of several isocyanides on the surface of gold powder. Results are compared and contrasted to known organometallic chemistry.

  18. Rhenium Solubility in Borosilicate Nuclear Waste Glass: Implications for the Processing and Immobilization of Technetium-99

    SciTech Connect

    McCloy, John S.; Riley, Brian J.; Goel, Ashutosh; Liezers, Martin; Schweiger, Michael J.; Rodriguez, Carmen P.; Hrma, Pavel R.; Kim, Dong-Sang; Lukens, Wayne W.; Kruger, Albert A.

    2012-10-26

    The immobilization of 99Tc in a suitable host matrix has proved to be an arduous task for the researchers in nuclear waste community around the world. At the Hanford site in Washington State, the total amount of 99Tc in low-activity waste (LAW) is ~1300 kg and the current strategy is to immobilize the 99Tc in borosilicate glass with vitrification. In this context, the present article reports on the solubility/retention of rhenium, a nonradioactive surrogate for 99Tc, in a LAW borosilicate glass. Due to the radioactive nature of technetium, rhenium was chosen as a simulant because of the similarity between their ionic radii and other chemical aspects. The glasses containing Re (0 – 10,000 ppm by mass) were synthesized in vacuum-sealed quartz ampoules in order to minimize the loss of Re by volatilization during melting at 1000 °C. The rhenium was found to predominantly exist as Re (VII) in all the glasses as observed by X-ray absorption near-edge structure (XANES). The solubility of Re in borosilicate glasses was determined to be ~3000 ppm (by mass) with inductively coupled plasma-optical emission spectroscopy (ICP-OES). At higher rhenium concentrations, some additional material was retained in the glasses in the form of crystalline inclusions that were detected by X-ray diffraction (XRD) and laser ablation-ICP mass spectrometry (LA-ICP-MS). The implications of these results on the immobilization of 99Tc from radioactive wastes in borosilicate glasses have been discussed.

  19. Technetium and rhenium pentacarbonyl complexes with C₂ and C₁₁ ω-isocyanocarboxylic acid esters.

    PubMed

    Miroslavov, Alexander E; Polotskii, Yuriy S; Gurzhiy, Vladislav V; Ivanov, Alexander Yu; Lumpov, Alexander A; Tyupina, Margarita Yu; Sidorenko, Georgy V; Tolstoy, Peter M; Maltsev, Daniil A; Suglobov, Dmitry N

    2014-08-04

    Technetium(I) and rhenium(I) pentacarbonyl complexes with ethyl 2-isocyanoacetate and methyl 11-isocyanoundecanoate, [M(CO)5(CNCH2COOEt)]ClO4 (M = Tc (1) and Re (2)) and [M(CO)5(CN(CH2)10COOMe)]ClO4 (M = Tc (3) and Re (4)), were prepared and characterized by IR, (1)H NMR, and (13)C{(1)H} NMR spectroscopy. The crystal structures of 1 and 2 were determined using single-crystal X-ray diffraction. The kinetics of thermal decarbonylation of technetium complexes 1 and 3 in ethylene glycol was studied by IR spectroscopy. The rate constants and activation parameters of this reaction were determined and compared with those for [Tc(CO)6](+). It was found that rhenium complexes 2 and 4 were stable with respect to thermal decarbonylation. Histidine challenge reaction of complexes 1 and 2 in phosphate buffer was examined by IR spectroscopy. In the presence of histidine, the rhenium pentacarbonyl isocyanide complex partially decomposes to form an unidentified yellow precipitate. Technetium analogue 1 is more stable under these conditions.

  20. Evaluation of oxide dispersion strengthened (ODS) molybdenum and molybdenum-rhenium Alloys

    SciTech Connect

    Mueller, A.J.; Bianco, R.; Buckman, R.W. Jr.

    1999-10-22

    Oxide dispersion strengthened (ODS) molybdenum alloys being developed for high temperature applications possess excellent high temperature strength and creep resistance. In addition they exhibit a ductile-to-brittle transition temperature (DBIT) in the worked and stress-relieved condition under longitudinal tensile load well below room temperature. However, in the recrystallized condition, the DBTT maybe near or above room temperature, depending on the volume fraction of oxide dispersion and the amount of prior work. Dilute rhenium additions (7 and 14 wt.%) to ODS molybdenum were evaluated to determine their effect on low temperature ductility. The addition of 7 wt.% rhenium to the ODS molybdenum did not significantly enhance the mechanical properties. However, the addition of 14 wt.% rhenium to the ODS molybdenum resulted in a DBTT well below room temperature in both the stress-relieved and recrystallized condition. Additionally, the tensile strength of ODS Mo-14Re is greater than the base ODS molybdenum at 1,000 to 1,250 C.

  1. Negative Impact of Total Body Irradiation on the Antitumor Activity of Rhenium-(I)-diselenoether.

    PubMed

    Collery, Philippe; Santoni, Francois; Mohsen, Ahmed; Mignard, Caroline; Desmaele, Didier

    2016-11-01

    It has been shown that a rhenium-(I)-diselenoether complex had significant antitumor activity in MDA-MB231 tumor-bearing mice after repeated oral or intraperitoneal administrations for 4 weeks at safe doses of 10 mg/kg/day. It has also been suggested that lower doses could be as effective as this dose. We, thus, tested two doses (5 and 10 mg/kg). The drug was orally administered daily by gavage for 4 weeks and for a further 2 weeks with or without 15 mg/kg paclitaxel treatment (intravenously, once a week). This experiment was performed in MDA-MB 231 tumor-bearing mice, as a model of resistant breast tumor. However, in contrast to previous studies, the mice were pretreated with total body irradiation to increase the tumor growth. These two doses were safe, even in combination with paclitaxel. The expected tumor regression was not observed with the rhenium-(I)-diselenoether complex, and there was even a significant increase of the tumor volume in mice treated with 10 mg/kg versus controls. No synergism was observed with paclitaxel. We comment on the possible negative impact of radiotherapy on the antitumor activity of the drug. Plasma and tumor rhenium and selenium concentrations are also reported.

  2. Characterization of rhenium compounds obtained by electrochemical synthesis after aging process

    SciTech Connect

    Vargas-Uscategui, Alejandro; Mosquera, Edgar; López-Encarnación, Juan M.; Chornik, Boris; Katiyar, Ram S.; Cifuentes, Luis

    2014-12-15

    The proper identification of the molecular nature of the aged rhenium compound obtained by means of electrodeposition from an alkaline aqueous electrolyte was determined. Chemical, structural and vibrational experimental characterization of the aged Re compound showed agreement with quantum-computations, thereby allowing the unambiguous identification of the Re compound as H(ReO{sub 4})H{sub 2}O. - Graphical abstract: Rhenium oxides were electrodeposited on a copper surface and after environmental aging was formed the H(ReO{sub 4})H{sub 2}O compound. The characterization of the synthesized material was made through the comparison of experimental evidence with quantum mechanical computations carried out by means of density functional theory (DFT). - Highlights: • Aged rhenium compound obtained by means of electrodeposition was studied. • The study was made by combining experimental and DFT-computational information. • The aged electrodeposited material is consistent with the H(ReO{sub 4})H{sub 2}O compound.

  3. Mono- and Dinuclear Phosphorescent Rhenium(I) Complexes: Impact of Subcellular Localization on Anticancer Mechanisms.

    PubMed

    Ye, Rui-Rong; Tan, Cai-Ping; Chen, Mu-He; Hao, Liang; Ji, Liang-Nian; Mao, Zong-Wan

    2016-06-01

    Elucidation of relationship among chemical structure, cellular uptake, localization, and biological activity of anticancer metal complexes is important for the understanding of their mechanisms of action. Organometallic rhenium(I) tricarbonyl compounds have emerged as potential multifunctional anticancer drug candidates that can integrate therapeutic and imaging capabilities in a single molecule. Herein, two mononuclear phosphorescent rhenium(I) complexes (Re1 and Re2), along with their corresponding dinuclear complexes (Re3 and Re4), were designed and synthesized as potent anticancer agents. The subcellular accumulation of Re1-Re4 was conveniently analyzed by confocal microscopy in situ in live cells by utilizing their intrinsic phosphorescence. We found that increased lipophilicity of the bidentate ligands could enhance their cellular uptake, leading to improved anticancer efficacy. The dinuclear complexes were more potent than the mononuclear counterparts. The molecular anticancer mechanisms of action evoked by Re3 and Re4 were explored in detail. Re3 with a lower lipophilicity localizes to lysosomes and induces caspase-independent apoptosis, whereas Re4 with higher lipophilicity specially accumulates in mitochondria and induces caspase-independent paraptosis in cancer cells. Our study demonstrates that subcellular localization is crucial for the anticancer mechanisms of these phosphorescent rhenium(I) complexes.

  4. In house development of (99m)Tc-Rhenium sulfide colloidal nanoparticles for sentinel lymph node detection.

    PubMed

    Dar, Ume-Kalsoom; Khan, Irfanullah; Javed, Muhammad; Ali, Muhammad; Hyder, Syed Waqar; Murad, Sohail; Anwar, Jamil

    2013-03-01

    In this study, rhenium sulfide colloidal nanoparticles were developed as radiopharmaceutical for sentinel lymph node detection. We directly used rhenium sulfide as a starting material for the preparation of colloidal nanoparticles. UV-visible spectrophotometry was used for characterization of in house developed colloidal particles. The size distribution of radioactive particles was studied by using membrane filtration method. The percentage of radiolabeled colloidal nanoparticles was determined by paper chromatography (PC). The study also includes in vitro stability, protein binding in human blood and bioevaluation in a rabbit model. The results indicate that 77.27 ± 3.26 % particles of size less than 20nm (suitable for lymphoscintigraphy) were radiolabeled. (99m)Tc labeled rhenium sulfide labeling efficacy with the radiometal is 98.5 ± 0.5%, which remains considerably stable beyond 5h at room temperature. Furthermore, it was observed that 70.2 ± 1.3% radiolabeled colloid complex showed binding with the blood protein. Bioevaluation results show the remarkable achievement of our radiopharmaceutical. The in house prepared (99m)Tc labeled rhenium sulfide colloidal nanoparticles reached the sentinel node within 15 min of post injection. These results indicate that (99m)Tc labeled rhenium sulfide colloid nanoparticles kit produced by a novel procedure seems of significant potential as a feasible candidate for further development to be used in clinical practice.

  5. The Metal or the Ligand? The Preferred Locus for Redox Changes in Oxygen Atom Transfer Reactions of Rhenium Amidodiphenoxides.

    PubMed

    Hoffman, Justin M; Oliver, Allen G; Brown, Seth Nathaniel

    2017-03-03

    The rhenium(V) oxo complex oxo(triphenylphosphine)(bis(3,5-di-tert-butyl-2-phenoxo)amido)rhenium(V), (ONO(Cat))ReO(PPh3), reacts with molecular oxygen to give triphenylphosphine oxide and the dimeric rhenium(VII) complex fac,anti-(ONO(Cat))Re(O)(μ-O)2Re(O)(ONO(Cat)). The ONO ligand adopts an unusual fac geometry, presumably to maximize π donation to rhenium; strong π donation is substantiated by the intraligand bond distances (metrical oxidation state = -2.24(9)). Addition of the N-heterocyclic carbene ligand IMes to fac,anti-(ONO(Cat))Re(O)(μ-O)2Re(O)(ONO(Cat)) cleaves the dimer into monomeric C1-symmetric fac-(ONO(Cat))ReO2(IMes). The monorhenium(VII) complex is deoxygenated by PMe2Ph to give the rhenium(V) compound (ONO(Cat))ReO(IMes), which can be independently prepared by ligand substitution of (ONO(Cat))ReO(PPh3). The degree of stereochemical rigidity exhibited by the dioxo compound, as established by dynamic NMR spectroscopy, excludes the intermediacy of mer-(ONO(Q))Re(V)O2(IMes) in this oxygen atom transfer reaction. Thus, oxygen atom transfer takes place preferentially by direct reduction of the oxorhenium(VII) moiety (classical oxygen atom transfer) rather than through initial internal electron transfer and ligand-centered reduction of an oxorhenium(V)-iminoquinone.

  6. Decay of 185Tl, 185m+gHg, 189m+gPb and energy location of the 13/2+ isomeric states in 185Hg, 189Pb, 193Po and 197Rn

    NASA Astrophysics Data System (ADS)

    Sauvage, J.; Roussière, B.; Genevey, J.; Franchoo, S.; Andreyev, A. N.; Barré, N.; Ben Braham, A.; Bourgeois, C.; Clavelin, J.-F.; De Witte, H.; Fedorov, D. V.; Fedoseyev, V. N.; Fraile, L. M.; Grave, X.; Huber, G.; Huyse, M.; Kilcher, P.; Köster, U.; Kunz, P.; Lesher, S. R.; Marsh, B. A.; Mukha, I.; Oms, J.; Porquet, M. G.; Seliverstov, M.; Stefanescu, I.; Van de Vel, K.; Van Duppen, P.; Volkov, YU. M.; Wojtasiewicz, A.

    2013-09-01

    The /EC decay of 185Tl was studied at the ISOLDE facility, the -rays belonging to 185Hg have been identified and a partial low-spin level scheme of 185Hg has been built. The decay of 185m+gHg was studied at the ISOCELE facility. Conversion electron lines of very low-energy transitions were observed for the first time. Electron data have been obtained for four transitions in 185Au and two transitions in 185Hg . From the analysis performed using an internal energy calibration procedure the energy location of the 185mHg has been determined to be keV. This value is consistent with that determined independently, keV, using 185m+gHg -decay data from literature. New particles emitted from 189m+gPb have been detected and their origins determined by in-source laser spectroscopy at the ISOLDE facility. - coincidence results have served to locate the isomeric state of 189Pb at keV. This latter value added to -decay data from literature have allowed the energy location of the isomeric states of 193Po and 197Rn at 95(7)keV and 194(12)keV, respectively. The nuclear structure of the isomeric and ground states in the nuclei of the three -emitter chains starting with 195m+g, 197m+g, 199m+gRn are discussed.

  7. 42 CFR 440.185 - Respiratory care for ventilator-dependent individuals.

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    ... individuals. 440.185 Section 440.185 Public Health CENTERS FOR MEDICARE & MEDICAID SERVICES, DEPARTMENT OF HEALTH AND HUMAN SERVICES (CONTINUED) MEDICAL ASSISTANCE PROGRAMS SERVICES: GENERAL PROVISIONS Definitions § 440.185 Respiratory care for ventilator-dependent individuals. (a) “Respiratory care...

  8. 42 CFR 416.185 - Process for establishing a new class of new technology IOLs.

    Code of Federal Regulations, 2014 CFR

    2014-10-01

    ... technology IOLs. 416.185 Section 416.185 Public Health CENTERS FOR MEDICARE & MEDICAID SERVICES, DEPARTMENT... Adjustment in Payment Amounts for New Technology Intraocular Lenses Furnished by Ambulatory Service Centers § 416.185 Process for establishing a new class of new technology IOLs. (a) Announcement of deadline...

  9. 46 CFR 185.212 - Mandatory chemical testing following serious marine incidents.

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    ... 46 Shipping 7 2010-10-01 2010-10-01 false Mandatory chemical testing following serious marine incidents. 185.212 Section 185.212 Shipping COAST GUARD, DEPARTMENT OF HOMELAND SECURITY (CONTINUED) SMALL PASSENGER VESSELS (UNDER 100 GROSS TONS) OPERATIONS Marine Casualties and Voyage Records § 185.212 Mandatory chemical testing following...

  10. 5 CFR 185.117 - Disqualification of reviewing official or ALJ.

    Code of Federal Regulations, 2010 CFR

    2010-01-01

    ... 5 Administrative Personnel 1 2010-01-01 2010-01-01 false Disqualification of reviewing official or ALJ. 185.117 Section 185.117 Administrative Personnel OFFICE OF PERSONNEL MANAGEMENT CIVIL SERVICE REGULATIONS PROGRAM FRAUD CIVIL REMEDIES § 185.117 Disqualification of reviewing official or ALJ. (a)...

  11. 5 CFR 185.117 - Disqualification of reviewing official or ALJ.

    Code of Federal Regulations, 2012 CFR

    2012-01-01

    ... 5 Administrative Personnel 1 2012-01-01 2012-01-01 false Disqualification of reviewing official or ALJ. 185.117 Section 185.117 Administrative Personnel OFFICE OF PERSONNEL MANAGEMENT CIVIL SERVICE REGULATIONS PROGRAM FRAUD CIVIL REMEDIES § 185.117 Disqualification of reviewing official or ALJ. (a)...

  12. 31 CFR 103.185 - Summons or subpoena of foreign bank records; Termination of correspondent relationship.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ... TRANSACTIONS Anti-Money Laundering Programs Law Enforcement Access to Foreign Bank Records § 103.185 Summons or... 31 Money and Finance: Treasury 1 2010-07-01 2010-07-01 false Summons or subpoena of foreign bank records; Termination of correspondent relationship. 103.185 Section 103.185 Money and Finance:...

  13. 46 CFR 185.730 - Servicing of inflatable liferafts, inflatable buoyant apparatus, inflatable life jackets, and...

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    ... inflatable liferaft or inflatable buoyant apparatus must be serviced at a facility specifically approved by... apparatus, inflatable life jackets, and inflated rescue boats. 185.730 Section 185.730 Shipping COAST GUARD... Operational Readiness, Maintenance, and Inspection of Lifesaving Equipment § 185.730 Servicing of...

  14. 46 CFR 185.730 - Servicing of inflatable liferafts, inflatable buoyant apparatus, inflatable life jackets, and...

    Code of Federal Regulations, 2011 CFR

    2011-10-01

    ... inflatable liferaft or inflatable buoyant apparatus must be serviced at a facility specifically approved by... apparatus, inflatable life jackets, and inflated rescue boats. 185.730 Section 185.730 Shipping COAST GUARD... Operational Readiness, Maintenance, and Inspection of Lifesaving Equipment § 185.730 Servicing of...

  15. 24 CFR 990.185 - Utilities expense level: Incentives for energy conservation/rate reduction.

    Code of Federal Regulations, 2010 CFR

    2010-04-01

    ... for energy conservation/rate reduction. 990.185 Section 990.185 Housing and Urban Development... Calculating Formula Expenses § 990.185 Utilities expense level: Incentives for energy conservation/rate reduction. (a) General/consumption reduction. If a PHA undertakes energy conservation measures that...

  16. 42 CFR 416.185 - Process for establishing a new class of new technology IOLs.

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    ... technology IOLs. 416.185 Section 416.185 Public Health CENTERS FOR MEDICARE & MEDICAID SERVICES, DEPARTMENT... Payment Amounts for New Technology Intraocular Lenses Furnished by Ambulatory Service Centers § 416.185 Process for establishing a new class of new technology IOLs. (a) Announcement of deadline for requests...

  17. 10 CFR 26.185 - Determining a fitness-for-duty policy violation.

    Code of Federal Regulations, 2010 CFR

    2010-01-01

    ... 10 Energy 1 2010-01-01 2010-01-01 false Determining a fitness-for-duty policy violation. 26.185 Section 26.185 Energy NUCLEAR REGULATORY COMMISSION FITNESS FOR DUTY PROGRAMS Determining Fitness-for-Duty Policy Violations and Determining Fitness § 26.185 Determining a fitness-for-duty policy violation....

  18. 10 CFR 26.185 - Determining a fitness-for-duty policy violation.

    Code of Federal Regulations, 2012 CFR

    2012-01-01

    ... 10 Energy 1 2012-01-01 2012-01-01 false Determining a fitness-for-duty policy violation. 26.185 Section 26.185 Energy NUCLEAR REGULATORY COMMISSION FITNESS FOR DUTY PROGRAMS Determining Fitness-for-Duty Policy Violations and Determining Fitness § 26.185 Determining a fitness-for-duty policy violation....

  19. 10 CFR 26.185 - Determining a fitness-for-duty policy violation.

    Code of Federal Regulations, 2013 CFR

    2013-01-01

    ... 10 Energy 1 2013-01-01 2013-01-01 false Determining a fitness-for-duty policy violation. 26.185 Section 26.185 Energy NUCLEAR REGULATORY COMMISSION FITNESS FOR DUTY PROGRAMS Determining Fitness-for-Duty Policy Violations and Determining Fitness § 26.185 Determining a fitness-for-duty policy violation....

  20. 10 CFR 26.185 - Determining a fitness-for-duty policy violation.

    Code of Federal Regulations, 2014 CFR

    2014-01-01

    ... 10 Energy 1 2014-01-01 2014-01-01 false Determining a fitness-for-duty policy violation. 26.185 Section 26.185 Energy NUCLEAR REGULATORY COMMISSION FITNESS FOR DUTY PROGRAMS Determining Fitness-for-Duty Policy Violations and Determining Fitness § 26.185 Determining a fitness-for-duty policy violation....

  1. 10 CFR 26.185 - Determining a fitness-for-duty policy violation.

    Code of Federal Regulations, 2011 CFR

    2011-01-01

    ... 10 Energy 1 2011-01-01 2011-01-01 false Determining a fitness-for-duty policy violation. 26.185 Section 26.185 Energy NUCLEAR REGULATORY COMMISSION FITNESS FOR DUTY PROGRAMS Determining Fitness-for-Duty Policy Violations and Determining Fitness § 26.185 Determining a fitness-for-duty policy violation....

  2. 5 CFR 185.140 - Stays ordered by the Department of Justice.

    Code of Federal Regulations, 2010 CFR

    2010-01-01

    ... 5 Administrative Personnel 1 2010-01-01 2010-01-01 false Stays ordered by the Department of Justice. 185.140 Section 185.140 Administrative Personnel OFFICE OF PERSONNEL MANAGEMENT CIVIL SERVICE REGULATIONS PROGRAM FRAUD CIVIL REMEDIES § 185.140 Stays ordered by the Department of Justice. If, at any...

  3. 46 CFR 185.520 - Abandon ship and man overboard drills and training.

    Code of Federal Regulations, 2012 CFR

    2012-10-01

    ... 46 Shipping 7 2012-10-01 2012-10-01 false Abandon ship and man overboard drills and training. 185.520 Section 185.520 Shipping COAST GUARD, DEPARTMENT OF HOMELAND SECURITY (CONTINUED) SMALL PASSENGER VESSELS (UNDER 100 GROSS TONS) OPERATIONS Preparations for Emergencies § 185.520 Abandon ship and man overboard drills and training. (a) The...

  4. 46 CFR 185.520 - Abandon ship and man overboard drills and training.

    Code of Federal Regulations, 2013 CFR

    2013-10-01

    ... 46 Shipping 7 2013-10-01 2013-10-01 false Abandon ship and man overboard drills and training. 185.520 Section 185.520 Shipping COAST GUARD, DEPARTMENT OF HOMELAND SECURITY (CONTINUED) SMALL PASSENGER VESSELS (UNDER 100 GROSS TONS) OPERATIONS Preparations for Emergencies § 185.520 Abandon ship and man overboard drills and training. (a) The...

  5. 46 CFR 185.520 - Abandon ship and man overboard drills and training.

    Code of Federal Regulations, 2014 CFR

    2014-10-01

    ... 46 Shipping 7 2014-10-01 2014-10-01 false Abandon ship and man overboard drills and training. 185.520 Section 185.520 Shipping COAST GUARD, DEPARTMENT OF HOMELAND SECURITY (CONTINUED) SMALL PASSENGER VESSELS (UNDER 100 GROSS TONS) OPERATIONS Preparations for Emergencies § 185.520 Abandon ship and man overboard drills and training. (a) The...

  6. 46 CFR 185.520 - Abandon ship and man overboard drills and training.

    Code of Federal Regulations, 2011 CFR

    2011-10-01

    ... 46 Shipping 7 2011-10-01 2011-10-01 false Abandon ship and man overboard drills and training. 185.520 Section 185.520 Shipping COAST GUARD, DEPARTMENT OF HOMELAND SECURITY (CONTINUED) SMALL PASSENGER VESSELS (UNDER 100 GROSS TONS) OPERATIONS Preparations for Emergencies § 185.520 Abandon ship and man overboard drills and training. (a) The...

  7. 41 CFR 102-117.185 - Where must I send a copy of the transportation documents?

    Code of Federal Regulations, 2011 CFR

    2011-01-01

    ... TRANSPORTATION 117-TRANSPORTATION MANAGEMENT Shipping Freight § 102-117.185 Where must I send a copy of the transportation documents? (a) You must forward an original copy of all transportation documents to: General... of the transportation documents? 102-117.185 Section 102-117.185 Public Contracts and...

  8. 24 CFR 990.185 - Utilities expense level: Incentives for energy conservation/rate reduction.

    Code of Federal Regulations, 2012 CFR

    2012-04-01

    ... for energy conservation/rate reduction. 990.185 Section 990.185 Housing and Urban Development... Calculating Formula Expenses § 990.185 Utilities expense level: Incentives for energy conservation/rate reduction. (a) General/consumption reduction. If a PHA undertakes energy conservation measures that...

  9. 24 CFR 990.185 - Utilities expense level: Incentives for energy conservation/rate reduction.

    Code of Federal Regulations, 2014 CFR

    2014-04-01

    ... for energy conservation/rate reduction. 990.185 Section 990.185 Housing and Urban Development... Calculating Formula Expenses § 990.185 Utilities expense level: Incentives for energy conservation/rate reduction. (a) General/consumption reduction. If a PHA undertakes energy conservation measures that...

  10. 24 CFR 990.185 - Utilities expense level: Incentives for energy conservation/rate reduction.

    Code of Federal Regulations, 2013 CFR

    2013-04-01

    ... for energy conservation/rate reduction. 990.185 Section 990.185 Housing and Urban Development... Calculating Formula Expenses § 990.185 Utilities expense level: Incentives for energy conservation/rate reduction. (a) General/consumption reduction. If a PHA undertakes energy conservation measures that...

  11. 24 CFR 990.185 - Utilities expense level: Incentives for energy conservation/rate reduction.

    Code of Federal Regulations, 2011 CFR

    2011-04-01

    ... for energy conservation/rate reduction. 990.185 Section 990.185 Housing and Urban Development... Calculating Formula Expenses § 990.185 Utilities expense level: Incentives for energy conservation/rate reduction. (a) General/consumption reduction. If a PHA undertakes energy conservation measures that...

  12. Carbon monoxide hydrogenation over rhenium-iron oxide catalysts and their characterization by soft X-ray spectroscopy

    SciTech Connect

    Komlyama, M.; Tsunoda, T.; Ogino, Y.

    1986-03-01

    Rhenium-iron oxide catalysts, prepared by the conventional impregnation technique and activated by reduction under various conditions, gave higher selectivities to oxygenates (mainly alcohols) in carbon monoxide hydrogenation than the control iron oxide (magnetite) catalysts. Bulk-sensitive soft X-ray spectroscopy (SXS) along with X-ray diffraction and Mossbauer spectroscopy found that in rhenium-iron oxide catalysts iron oxide is in the form of an intermediate phase represented as (1 - x)Fe/sub 3/O/sub 4/.xFe/sub 8/3/O/sub 4/; between Fe/sub 3/O/sub 4/ and ..gamma..-Fe/sub 2//O/sub 3/. The extent of the formation of this intermediate phase was correlated with the oxygenate selectivities of the rhenium-iron oxide catalysts. The usefulness of SXS in characterizing bulk of solid catalysts was demonstrated.

  13. Biodistribution of rhenium cluster complex K₄[Re6S8(CN)6] in the body of laboratory rats.

    PubMed

    Brylev, K A; Shestopalov, M A; Khripko, O P; Trunova, V A; Zvereva, V V; Wang, C C; Mironov, Yu V; Fedorov, V E

    2013-10-01

    We studied the biodistribution of luminescent octahedral rhenium cluster complex K4[Re6S8(CN)6], a promising agent for photodynamic therapy. It was shown that rhenium complex [Re6S8(CN)6](4-)is mainly accumulated in the liver, the central organ of metabolism, and can be excreted by the kidneys. The cluster complex was also accumulated in the spleen in significant amount, which makes it a promising agent for creation of preparations for diagnostics and treatment of lymphoproliferative disorders. The mean lethal dose of the cluster complex was 0.38 g/kg.

  14. Facile synthesis of single crystalline rhenium (VI) trioxide nanocubes with high catalytic efficiency for photodegradation of methyl orange.

    PubMed

    Chong, Yuan Yi; Fan, Wai Yip

    2013-05-01

    Single-crystalline rhenium trioxide (ReO3) nanocubes have been prepared for the first time without the need of surfactants via controlled reduction of rhenium (VII) oxide (Re2O7), sandwiched between silicon wafers at 250°C. The metallic ReO3 nanocubes are magnetic and possess surface plasmon resonance (SPR) bands down to the NIR region. The nanocubes also show very high catalytic activity toward the photodegradation of methyl orange (MO) under ambient conditions. A mechanism has been proposed to account for the photodegradation process.

  15. The next step in chemical propulsion: Oxide-iridium/rhenium combustion chambers

    SciTech Connect

    Fortini, Arthur J.; Tuffias, Robert H.

    1999-01-22

    Chemical propulsion systems are currently limited by materials issues. Until recently, the state-of-the-art material for liquid propellant combustion chambers was silicide-coated niobium. However, combustion chamber performance demands have exceeded the capabilities of this material system, requiring development of better materials. The iridium/rhenium combustion chamber, comprising a rhenium structural shell with an iridium inner liner for oxidation protection, represents the current state of the art in high-performance, high temperature, long-life propulsion systems using nitrogen tetroxide/monomethyl hydrazine propellant. However, oxygen/hydrogen (O{sub 2}/H{sub 2}) and new 'green' monopropellants under development to replace hydrazine will be significantly more oxidizing at operating temperature. For these more highly aggressive combustion environments, Ultramet has shown that substantial additional life can be obtained by lining the interior of the combustion chamber with a refractory metal oxide, which functions as a thermal and gas diffusion barrier and provides dramatically increased oxidation resistance. Ultramet has fabricated numerous 22-N (5-lb{sub f}) thrust chambers with this oxide-iridium/rhenium architecture that have been hot-fire tested at NASA Lewis Research Center in O{sub 2}/H{sub 2} propellant at mixture ratios of 6 and 16, with steady-state exterior wall temperatures ranging from 2433 to 2899 K, comprising the most severe temperature and oxidizing conditions ever utilized. Of the seven chambers tested to date, three failed due to facility problems, and two never failed. The best-performing chamber was hot-fired for 13,595 seconds (227 minutes; 3.8 hours) and showed no visible signs of degradation. Additional chambers are being fabricated for future testing.

  16. The next step in chemical propulsion: Oxide-iridium/rhenium combustion chambers

    NASA Astrophysics Data System (ADS)

    Fortini, Arthur J.; Tuffias, Robert H.

    1999-01-01

    Chemical propulsion systems are currently limited by materials issues. Until recently, the state-of-the-art material for liquid propellant combustion chambers was silicide-coated niobium. However, combustion chamber performance demands have exceeded the capabilities of this material system, requiring development of better materials. The iridium/rhenium combustion chamber, comprising a rhenium structural shell with an iridium inner liner for oxidation protection, represents the current state of the art in high-performance, high temperature, long-life propulsion systems using nitrogen tetroxide/monomethyl hydrazine propellant. However, oxygen/hydrogen (O2/H2) and new ``green'' monopropellants under development to replace hydrazine will be significantly more oxidizing at operating temperature. For these more highly aggressive combustion environments, Ultramet has shown that substantial additional life can be obtained by lining the interior of the combustion chamber with a refractory metal oxide, which functions as a thermal and gas diffusion barrier and provides dramatically increased oxidation resistance. Ultramet has fabricated numerous 22-N (5-lbf) thrust chambers with this oxide-iridium/rhenium architecture that have been hot-fire tested at NASA Lewis Research Center in O2/H2 propellant at mixture ratios of 6 and 16, with steady-state exterior wall temperatures ranging from 2433 to 2899 K, comprising the most severe temperature and oxidizing conditions ever utilized. Of the seven chambers tested to date, three failed due to facility problems, and two never failed. The best-performing chamber was hot-fired for 13,595 seconds (227 minutes; 3.8 hours) and showed no visible signs of degradation. Additional chambers are being fabricated for future testing.

  17. Synthesis, molecular structure and magnetic properties of a rhenium(IV) compound with catechol

    NASA Astrophysics Data System (ADS)

    Cuevas, A.; Geis, L.; Pintos, V.; Chiozzone, R.; Sanchíz, J.; Hummert, M.; Schumann, H.; Kremer, C.

    2009-03-01

    A novel Re(IV) complex containing catechol as ligand has been prepared and characterized. The crystal structure of (HNEt 3)(NBu 4)[ReCl 4(cat)]·H 2cat was determined. The rhenium ion presents a distorted octahedral geometry, being bonded to a bidentate catecholate group and four chloride anions. The magnetic properties of the complex were studied, a /2 D/ (the energy gap between ±3/2 and ±1/2 Kramers doublets) value of 190(10) cm -1. This is the largest /2 D/ value reported for Re(IV) up to now.

  18. A first-principles model for anomalous segregation in dilute ternary tungsten-rhenium-vacancy alloys

    NASA Astrophysics Data System (ADS)

    Wróbel, J. S.; Nguyen-Manh, D.; Kurzydłowski, K. J.; Dudarev, S. L.

    2017-04-01

    The occurrence of segregation in dilute alloys under irradiation is a highly unusual phenomenon that has recently attracted attention, stimulated by the interest in the fundamental properties of alloys as well as by their applications. The fact that solute atoms segregate in alloys that, according to equilibrium thermodynamics, should exhibit full solubility, has significant practical implications, as the formation of precipitates strongly affects physical and mechanical properties of alloys. A lattice Hamiltonian, generalizing the so-called ‘ABV’ Ising model and including collective many-body inter-atomic interactions, has been developed to treat rhenium solute atoms and vacancies in tungsten as components of a ternary alloy. The phase stability of W–Re-vacancy alloys is assessed using a combination of density functional theory (DFT) calculations and cluster expansion (CE) simulations. The accuracy of CE parametrization is evaluated against the DFT data, and the cross-validation error is found to be less than 4.2 meV/atom. The free energy of W–Re-vacancy ternary alloys is computed as a function of temperature using quasi-canonical Monte Carlo simulations, using effective two, three and four-body interactions. In the low rhenium concentration range (<5 at. % Re), solute segregation is found to occur in the form of voids decorated by Re atoms. These vacancy-rhenium clusters remain stable over a broad temperature range from 800 K to 1600 K. At lower temperatures, simulations predict the formation of Re-rich rhenium–vacancy clusters taking the form of sponge-like configurations that contain from 30 to 50 at. % Re. The anomalous vacancy-mediated segregation of Re atoms in W can be rationalized by analyzing binding energy dependence as a function of Re to vacancy ratio as well as chemical Re–W and Re-vacancy interactions and short-range order parameters. DFT calculations show that rhenium–vacancy binding energies can be as high as 1.5 eV if the

  19. Analysis of the Nuclear Structure of Rhenium-186 Using Neutron-Induced Reactions

    DTIC Science & Technology

    2015-03-26

    metal pill samples after they were fashioned. Figure 19. Schematic of the 3D - printed holder used to contain the pills of pressed rhenium metal powder...holders were 3-D printed in two pieces at ARL, as shown in Figure 19. These two pieces were held together by setscrew, and contained the vacuum-pressed...current of approximately 1200 nA from 10–23 November. Additionally, a bad filament in the accelerator led to an unplanned 28-hour shutdown from 17–18

  20. From N-alkylimidazole ligands at a rhenium center: ring opening or formation of NHC complexes.

    PubMed

    Huertos, Miguel A; Pérez, Julio; Riera, Lucía; Menéndez-Velázquez, Amador

    2008-10-15

    Cationic rhenium tricarbonyl complexes with three N-alkylimidazole ligands undergo deprotonation of the central CH group upon reaction with 1 equiv of KN(SiMe3)2. For the tris(N-methylimidazole) complex, the metal fragment shifts from N to C, leaving an NHC complex with a nonsubstituted N atom. For compounds with at least one N-mesitylimidazole ligand, the intramolecular attack of the deprotonated carbon onto the central carbon of an N-mesitylimidazole ligand results in ring opening of the latter.

  1. Testing and evaluation of oxide-coated iridium/rhenium chambers

    NASA Technical Reports Server (NTRS)

    Reed, Brian D.

    1993-01-01

    Iridium-coated rhenium provides long life operation of radiation-cooled rockets at temperatures up to 2200 C. Ceramic oxide coatings could be used to increase iridium/rhenium rocket lifetimes and allow operation in highly oxidizing environments. Ceramic oxide coatings promise to serve as both thermal and diffusion barriers for the iridium layer. Seven ceramic oxide-coated iridium/rhenium, 22 N rocket chambers were tested on gaseous hydrogen/gaseous oxygen propellants. Five chambers had thick (over 10 mils), monolithic coatings of either hafnia or zirconia. Two chambers had coatings with thicknesses less than 5 mils. One of these chambers had a thin-walled coating of zirconia infiltrated with sol gel hafnia. The other chamber had a coating composed of an iridium/oxide composite. The purpose of this test program was to assess the ability of the oxide coatings to withstand the thermal shock of combustion initiation, adhere under repeated thermal cycling, and operate in aggressively oxidizing environments. All of the coatings survived the thermal shock of combustion and demonstrated operation at mixture ratios up to 11. The iridium/oxide composite coated chamber included testing for over 29 minutes at mixture ratio 16. The thicker-walled coatings provided the larger temperature drops across the oxide layer (up to 570 C), but were susceptible to macrocracking and eventual chipping at a stress concentrator. The cracks apparently resealed during firing, under compression of the oxide layer. The thinner-walled coatings did not experience the macrocracking and chipping of the chambers seen with the thick, monolithic coatings. However, burnthroughs in the throat region did occur in both of the thin-walled chambers at mixture ratios well above stochiometric. The burn-throughs were probably the result of oxygen-diffusion through the oxide coating that allowed the underlying iridium and rhenium layers to be oxidized. The results of this test program indicated that the thin

  2. Exchange interactions and Tc in rhenium-doped silicon: DFT, DFT + U and Monte Carlo calculations.

    PubMed

    Wierzbowska, Małgorzata

    2012-03-28

    Interactions between rhenium impurities in silicon are investigated by means of the density functional theory (DFT) and the DFT + U scheme. All couplings between impurities are ferromagnetic except the Re-Re dimers which in the DFT method are nonmagnetic, due to the formation of the chemical bond supported by substantial relaxation of the geometry. The critical temperature is calculated by means of classical Monte Carlo (MC) simulations with the Heisenberg Hamiltonian. The uniform ferromagnetic phase is obtained with the DFT exchange interactions at room temperature for the impurities concentration of 7%. With the DFT + U exchange interactions, the ferromagnetic clusters form above room temperature in MC samples containing only 3% Re.

  3. Direct radiometric dating of hydrocarbon deposits using rhenium-osmium isotopes.

    PubMed

    Selby, David; Creaser, Robert A

    2005-05-27

    Rhenium-osmium (Re-Os) data from migrated hydrocarbons establish the timing of petroleum emplacement for the giant oil sand deposits of Alberta, Canada, at 112 +/- 5.3 million years ago. This date does not support models that invoke oil generation and migration for these deposits in the Late Cretaceous. Most Re-Os data from a variety of deposits within the giant hydrocarbon system show similar characteristics, supporting the notion of a single source for these hydrocarbons. The Re-Os data disqualify Cretaceous rocks as the primary hydrocarbon source but suggest an origin from older source rocks. This approach should be applicable to dating oil deposits worldwide.

  4. Superconducting molybdenum-rhenium electrodes for single-molecule transport studies

    SciTech Connect

    Gaudenzi, R.; Island, J. O.; Bruijckere, J. de; Burzurí, E.; Zant, H. S. J. van der; Klapwijk, T. M.

    2015-06-01

    We demonstrate that electronic transport through single molecules or molecular ensembles, commonly based on gold (Au) electrodes, can be extended to superconducting electrodes by combining gold with molybdenum-rhenium (MoRe). This combination induces proximity-effect superconductivity in the gold to temperatures of at least 4.6 K and magnetic fields of 6 T, improving on previously reported aluminum based superconducting nanojunctions. As a proof of concept, we show three-terminal superconductive transport measurements through an individual Fe{sub 4} single-molecule magnet.

  5. RR Lyrae stars in local group galaxies. I. NGC 185

    SciTech Connect

    Saha, A.; Hoessel, J.G. Space Telescope Science Institute, Baltimore, MD Washburn Observatory, Madison, WI )

    1990-01-01

    Deep CCD images of NGC 185 taken with the 4-shooter on the Hale 5-m telescope have been processed to find and photometrically measure RR Lyrae stars. 176 variable stars have been found, of which 151 are surmised to be RR Lyrae stars. Finding charts, periods, and light curves are presented. The RR Lyrae stars in this galaxy have a very wide distribution of periods indicating a wide range of metallicity. The mean magnitudes of the RR Lyraes is determined to be 25.20 mag. A distance modulus of 23.79 is derived, based on the best currently available values of foreground extinction and mean absolute magnitudes of RR Lyrae stars. 33 refs.

  6. Diffusion aluminide coatings for protecting the surface of the internal space of single-crystal turbine blades made of rhenium- and rhenium-ruthenium-containing high-temperature alloys: Part II

    NASA Astrophysics Data System (ADS)

    Muboyadzhyan, S. A.; Galoyan, A. G.

    2013-03-01

    The production of heat-resistant aluminide and chromium aluminide protective coatings with a barrier layer, which is based on the carbides of the refractory elements of a nickel superalloy, is considered for the powder methods of diffusion chromium and aluminum saturation of the surface of the internal space of single-crystal high-pressure turbine blades made of high-temperature rhenium- and rhenium-ruthenium-containing alloys for a gas turbine engine. The barrier layer is shown to prevent the formation of a secondary reaction zone, which softens an alloy, under a heat-resistant coating during long-term high-temperature holding. The kinetics of powder-assisted aluminizing and chromizing-aluminizing of high-temperature rhenium- and rhenium-ruthenium-containing alloys is studied, aluminizing and chromizing-aluminizing conditions are determined, and the effect of heat-resistant diffusion coatings with a barrier layer on the mechanical properties of the high-temperature alloys is investigated.

  7. Investigation of activation cross-section data of proton induced nuclear reactions on rhenium.

    PubMed

    Ditrói, F; Tárkányi, F; Takács, S; Hermanne, A; Yamazaki, H; Baba, M; Mohammadi, A; Ignatyuk, A V

    2013-07-01

    In the frame of systematic investigations of activation cross-section data for different applications the excitation functions of (nat)Re(p,x)(185)Os, (183m)Os, (183g)Os, (182)Os, (181m)Os, (186g)Re, (184m)Re, (184g)Re, (183)Re, (182m)Re, (182g)Re and (181g)Re reactions were measured up to 70MeV. The data for the (nat)Re(p,x) (183m)Os, (183g)Os, (182)Os, (181g)Os,(186g)Re, (184m)Re,(182m)Re, (182g)Re, and (181)Re reactions are reported for the first time. The activation method, the stacked foil irradiation technique and γ-spectroscopy for activity detection were used. The experimental data were compared with predictions of three theoretical codes. From the measured cross-section thick target integral yields were also calculated and presented.

  8. Selective LXR{alpha} inhibitory effects observed in plant extracts of MEH184 (Parthenocissua tricuspidata) and MEH185 (Euscaphis japonica)

    SciTech Connect

    Kim, Kang Ho; Choi, Seung Hyun; Lee, Thomas S.; Oh, Won Keun; Kim, Dong Sun; Kim, Jae Bum . E-mail: jaebkim@snu.ac.kr

    2006-10-20

    Liver X receptors (LXRs) are nuclear hormone receptors that behave as lipid sensors of cellular cholesterol and fatty acid. Although LXR activation can alleviate hypercholesterolemia by inducing cholesterol efflux, it also results in undesirable effects of fatty acid synthesis, resulting in hepatic steatosis and hyperlipidemia. Therefore, it is critical to identify LXR{alpha} inhibitory agents that would repress fatty acid synthesis and hepatic lipid accumulation. In current study, screening of plant extracts used for traditional oriental medicine resulted in the identification of two candidates demonstrating selective LXR{alpha} inhibitory activity. These were whole leaf methanol extracts of Parthenocissua tricuspidata (MEH184) and Euscaphis japonica (MEH185). Both MEH184 and MEH185 decreased transcriptional activity of LXR{alpha} and the expression of LXR{alpha} target genes, such as FAS and ADD1/SREBP1c. Additionally, MEH184 and MEH184 significantly reduced lipogenesis and adipocyte differentiation. Together, the data imply that MEH184 and MEH185 possess selective antagonistic properties on LXR{alpha} to downregulate lipogenesis.

  9. Crystallization of rhenium salts in a simulated low-activity waste borosilicate glass

    SciTech Connect

    Riley, Brian J.; McCloy, John S.; Goel, Ashutosh; Liezers, Martin; Schweiger, Michael J.; Liu, Juan; Rodriguez, Carmen P.; Kim, Dong-Sang

    2013-04-01

    This study presents a new method for looking at the solubility of volatile species in simulated low-activity waste glass. The present study looking at rhenium salts is also applicable to real applications involving radioactive technetium salts. In this synthesis method, oxide glass powder is mixed with the volatiles species, vacuum-sealed in a fused quartz ampoule, and then heat-treated under vacuum in a furnace. This technique restricts the volatile species to the headspace above the melt but still within the sealed ampoule, thus maximizing the volatile concentration in contact with the glass. Various techniques were used to measure the solubility of rhenium in glass and include energy dispersive spectroscopy, wavelength dispersive spectroscopy, laser ablation inductively-coupled plasma mass spectroscopy, and inductively-coupled plasma optical emission spectroscopy. The Re-solubility in this glass was determined to be ~3004 parts per million Re atoms. Above this concentration, the salts separated out of the melt as inclusions and as a low viscosity molten salt phase on top of the melt observed during and after cooling. This salt phase was analyzed with X-ray diffraction, scanning electron microscopy as well as some of the other aforementioned techniques and identified to be composed of alkali perrhenate and alkali sulfate.

  10. Rhenium volatilisation as caesium perrhenate from simulated vitrified high level waste from a melter crucible

    SciTech Connect

    Taylor, T.A.; Short, R.J.; Gribble, N.R.; Roe, J.I.; Steele, C.J.

    2013-07-01

    The Waste Vitrification Plant (WVP) converts Highly Active Liquor (HAL) from spent nuclear fuel reprocessing into a stable vitrified product. Recently WVP have been experiencing accumulation of solids in their primary off gas (POG) system leading to potential blockages. Chemical analysis of the blockage material via Laser Induced Breakdown Spectroscopy (LIBS) has shown it to exclusively consist of caesium, technetium and oxygen. The solids are understood to be caesium pertechnetate (CsTcO{sub 4}), resulting from the volatilisation of caesium and technetium from the high level waste glass melt. Using rhenium as a chemical surrogate for technetium, a series of full scale experiments have been performed in order to understand the mechanism of rhenium volatilisation as caesium perrhenate (CsReO{sub 4}), and therefore technetium volatilisation as CsTcO{sub 4}. These experiments explored the factors governing volatilisation rates from the melt, potential methods of minimising the amount of volatilisation, and various strategies for mitigating the deleterious effects of the volatile material on the POG. This paper presents the results from those experiments, and discusses potential methods to minimise blockages that can be implemented on WVP, so that the frequency of the CsTcO{sub 4} blockages can be reduced or even eradicated altogether. (authors)

  11. Computer acquired performance data from a chemically vapor-deposited-rhenium, niobium planar diode

    NASA Technical Reports Server (NTRS)

    Manista, E. J.; Morris, J. F.; Smith, A. L.; Lancashire, R. B.

    1973-01-01

    Performance data from a chemically vapor-deposited-rhenium, niobium thermionic converter are presented. The planar converter has a guard-ringed collector and a nominal fixed spacing of 0.25 mm (10 mils). The data were obtained by using a computerized acquisition system and are available on request to one of the authors on microfiche as individual and composite parametric current, voltage curves. The parameters are the temperatures of the emitter T sub E collector T sub C, and cesium reservoir T sub R. The composite plots have constant T sub E and varying T sub C or T sub R, or both. Current, voltage envelopes having constant T sub E with and without fixed T sub C appear in the present report. The diode was tested at increments between 1600 and 2000 K for the emitter Hohlraum, 800 to 1100 K for the collector, and 540 and 650 K for the reservoir. A total of 312 current, voltage curves were obtained in the present performance evaluation. Current, voltage envelopes from three rhenium emitter converters evaluated in the present program are also given. The data are compared at commom emitter Hohlraum temperatures.

  12. Synthesis, characterisation and bioimaging of a fluorescent rhenium-containing PNA bioconjugate.

    PubMed

    Gasser, Gilles; Pinto, Antonio; Neumann, Sebastian; Sosniak, Anna M; Seitz, Michael; Merz, Klaus; Heumann, Rolf; Metzler-Nolte, Nils

    2012-02-28

    A new rhenium tricarbonyl complex of a bis(quinoline)-derived ligand (2-azido-N,N-bis((quinolin-2-yl)methyl)ethanamine, L-N(3)), namely [Re(CO)(3)(L-N(3))]Br was synthesized and characterized in-depth, including by X-ray crystallography. [Re(CO)(3)(L-N(3))]Br exhibits a strong UV absorbance in the range 300-400 nm with a maximum at 322 nm, and upon photoexcitation, shows two distinct emission bands at about 430 and 560 nm in various solvents (water, ethylene glycol). [Re(CO)(3)(L-N(3))]Br could be conjugated, on a solid phase, to a peptide nucleic acid (PNA) oligomer using the copper(I)-catalyzed azide-alkyne cycloaddition reaction (Cu-AAC, "click" chemistry) and an alkyne-containing PNA building block to give Re-PNA. It was demonstrated that upon hybridisation with a complementary DNA strand (DNA), the position of the maxima and emission intensity for the hybrid Re-PNA·DNA remained mainly unchanged compared to those of the single strand Re-PNA. The rhenium-containing PNA oligomer Re-PNA could be then mediated in living cells where they have been shown to be non-toxic contrary to the general notion that organometallic compounds are usually unstable under physiological conditions and/or cytotoxic. Furthermore, Re-PNA could be detected in living cells using fluorescent microscopy.

  13. Tungsten alloyed with rhenium as an advanced material for heat-resistant silicon ICs interconnects

    NASA Astrophysics Data System (ADS)

    Belov, A. N.; Chaplygin, Yu. A.; Golishnikov, A. A.; Kostyukov, D. A.; Putrya, M. G.; Safonov, S. O.; Shevyakov, V. I.

    2016-12-01

    This paper presents the results of comparative analysis of the electrical and mechanical characteristics of the tungsten and tungsten alloyed with rhenium films deposited on silicon, from the point of view of their use as interconnects in silicon ICs. W and W (Re-5%) alloyed with rhenium films were made by magnetron deposition. Sheet resistivity for W and W (Re- 5%) was 13 and 27 μOhm·cm respectively. Elemental composition the formed films was examined by Auger spectroscopy. To investigate the electromigration resistance of the conductors a methodology based on the accelerated electromigration testing at constant temperature was used. A comparative analysis of the mechanical stresses carried out in the W and W(Re - 5%) films. For this purpose was applied non-destructive method for optical laser scanning. At the same time, these films explored their ability of adhesion to silicon and silicon oxide. It is shown that the pull force of the W(Re - 5%) films was 1500 G/mm2, of the W films 700 G/mm2

  14. [Antioxidant properties of cluster rhenium compounds and their effect on erythropoiesis of rats with guerin carcinoma].

    PubMed

    Voronkova, Y S; Babiy, S O; Ivans'kar, L V; Shtemenko, O V; Shtemenko, N I

    2015-01-01

    Biochemical characteristics of kidneys, pe- ripheral blood and bone marrow of rats in model of tumor growth under introduction of cisplatin and cis-tetrachlorodi-μ-isobutyratodirhenium(III), cis-Re2(i-C3H7COO)2Cl4 (I) have been investigated. It was shown that introduction of I alone and together with cisplatin led to decrease of biochemical markers of oxidation of lipids and proteins in tissue homogenates of the kidneys, change of enzyme activity in the urea and tissue homogenates of the kidneys, by a decrease of filtration function of kidneys. Introduction of nanoliposomal forms of the rhenium cluster compound led to a practically normal morphological picture of bone marrow and increase of the RBC (by 60%) with normalization of hematocrit counts, and decrease of quantities of destructed RBC (3.2 times) in comparison with the tumor-bearing animals. A tentative scheme of influence of cluster rhenium compound on erythropoiesis through regulation of synthesis of erythropoietin in kidneys has been proposed.

  15. Antitumor activity of a rhenium (I)-diselenoether complex in experimental models of human breast cancer.

    PubMed

    Collery, Philippe; Mohsen, Ahmed; Kermagoret, Anthony; Corre, Samantha; Bastian, Gérard; Tomas, Alain; Wei, Ming; Santoni, François; Guerra, Nadia; Desmaële, Didier; d'Angelo, Jean

    2015-08-01

    Rhenium (I)-diselenother (Re-diselenoether) is a water soluble metal-based compound, combining one atom of rhenium and two atoms of selenium. This compound has been reported to exhibit marked activities against several solid tumor cell lines. We now disclose an improved synthesis of this complex. The Re-diselenoether showed a potent inhibitory effect on MDA-MB231 cell division in vitro, which lasted when the complex was no longer present in the culture. Re-diselenoether induced a remarkable reduction of the volume of the primitive breast tumors and of the pulmonary metastases without clinical signs of toxicity, in mice-bearing a MDA-MB231 Luc+ tumor, orthotopically transplanted, after a daily oral administration at the dose of 10 mg/kg/d. Interestingly, an antagonism was observed when cisplatin was administered as a single i.p. injection 1 week after the end of the Re-diselenoether administration. In an effort to gain insight of the mechanisms of action of Re-diselenoether complex, interaction with 9-methylguanine as a nucleic acid base model was studied. We have shown that Re-diselenoether gave both mono- and bis-guanine Re adducts, the species assumed to be responsible for the DNA intrastrand lesions.

  16. Design, analysis, and fabrication of oxide-coated iridium/rhenium combustion chambers

    NASA Technical Reports Server (NTRS)

    Jang, Q.; Tuffias, R. H.; Laferla, R.; Ghoniem, N. M.

    1993-01-01

    Iridium-coated rhenium (Ir/Re) combustion chambers provide high temperature, oxidation-resistant operation for radiation-cooled liquid-fueled rocket engines. A 22-N (5-lb(sub f)) chamber has been operated for 15 hours at 2200 C (4000 F) using nitrogen tetroxide/monomethyl hydrazine (NTO/MMH) propellant, with negligible internal erosion. The oxidation resistance of these chambers could be further increased by the addition of refractory oxide coatings, providing longer life and/or operation in more oxidizing and higher temperature environments. The oxide coatings would serve as a thermal and diffusion barrier for the iridium coating, lowering the temperature of the iridium layer while also preventing the ingress of oxygen and egress of iridium oxides. This would serve to slow the failure mechanisms of Ir/Re chambers, namely the diffusion of rhenium to the inner surface and the oxidation of iridium. Such protection could extend chamber lifetimes by tens or perhaps hundreds of hours, and allow chamber operation on stoichiometric or higher mixture ratio oxygen/hydrogen (O2/H2) propellant. Extensive thermomechanical, thermochemical, and mass transport modeling was performed as a key material/structure design tool. Based on the results of these analyses, several 22-N oxide-coated Ir/Re chambers were fabricated and delivered to NASA Lewis Research Center for hot-fire testing.

  17. Photocatalytic H2 production from water with rhenium and cobalt complexes.

    PubMed

    Probst, Benjamin; Guttentag, Miguel; Rodenberg, Alexander; Hamm, Peter; Alberto, Roger

    2011-04-18

    Photocatalytic hydrogen production in pure water for three component systems using a series of rhenium-based photosensitizers (PS) and cobalt-based water reduction catalysts (WRC), with triethanolamine (TEOA) as an irreversible electron donor, is described. Besides the feasibility of this reaction in water, key findings are reductive quenching of the excited state of the PS by TEOA (k(q) = 5-8 × 10(7) M(-1) s(-1); Φ(cage) = 0.75) and subsequent transfer of an electron to the WRC (k(Co(III)) = 1.1 × 10(9) M(-1) s(-1)). Turnover numbers in rhenium (TON(Re), H/Re) above 500 were obtained, whereas TON(Co) (H(2)/Co) did not exceed 17. It is shown that the cobalt-based WRC limits long-term performance. Long-term performance critically depends on pH and the type of WRC used but is unaffected by the type of PS or the concentration of WRC. A quantum yield of 30% was obtained (H/photon).

  18. Phase composition of heat-resisting alloy modified by ageing and alloyed by rhenium

    NASA Astrophysics Data System (ADS)

    Koneva, Nina; Nikonenko, Elena; Popova, Natalya; Gibert, Ivan; Kozlov, Eduard

    2016-11-01

    The paper presents the transmission electron microscope (TEM) investigations of the structure of Ni-Al-Cr-based superalloy which is obtained by directional crystallization technique. The structural TEM investigations are carried out in two stages: 1) annealing at 1150°C for 1 h and 2) annealing at 1100°C for 480 h. The qualitative and quantitative analysis is given for the structure, phase composition and morphology of heat-resisting alloy additionally alloyed by rhenium Re both in the original state and after thermal treatment. The heat-resisting alloy comprises ˜70 at % Ni, ˜17 at % Al and ˜5 at % Cr. The total amount of the primary alloying elements of Mo, W, Ta, Ti, Co, La was ˜7 at % and 0.4 at % Re. It is shown that the structure of the superalloy is represented by (γ + γ')-phase mixture which has a morphologically correct crystallographic orientation and quasi-monocrystalline structure. σ-phase is formed in this superalloy due to rhenium. Since Re distribution in the alloy is not uniform, only a part of (γ + γ')-phase quasi-cuboids is distorted. It is shown that Re modification distorts the ideal structure of (γ + γ')-phase quasi-cuboids and results in the formation of β-, χ-and σ-phases.

  19. Design, analysis, and fabrication of oxide-coated iridium/rhenium combustion chambers

    NASA Astrophysics Data System (ADS)

    Jang, Q.; Tuffias, R. H.; Laferla, R.; Ghoniem, N. M.

    1993-11-01

    Iridium-coated rhenium (Ir/Re) combustion chambers provide high temperature, oxidation-resistant operation for radiation-cooled liquid-fueled rocket engines. A 22-N (5-lb(sub f)) chamber has been operated for 15 hours at 2200 C (4000 F) using nitrogen tetroxide/monomethyl hydrazine (NTO/MMH) propellant, with negligible internal erosion. The oxidation resistance of these chambers could be further increased by the addition of refractory oxide coatings, providing longer life and/or operation in more oxidizing and higher temperature environments. The oxide coatings would serve as a thermal and diffusion barrier for the iridium coating, lowering the temperature of the iridium layer while also preventing the ingress of oxygen and egress of iridium oxides. This would serve to slow the failure mechanisms of Ir/Re chambers, namely the diffusion of rhenium to the inner surface and the oxidation of iridium. Such protection could extend chamber lifetimes by tens or perhaps hundreds of hours, and allow chamber operation on stoichiometric or higher mixture ratio oxygen/hydrogen (O2/H2) propellant. Extensive thermomechanical, thermochemical, and mass transport modeling was performed as a key material/structure design tool. Based on the results of these analyses, several 22-N oxide-coated Ir/Re chambers were fabricated and delivered to NASA Lewis Research Center for hot-fire testing.

  20. A hexadentate bis(thiosemicarbazonato) ligand: rhenium(V), iron(III) and cobalt(III) complexes.

    PubMed

    Paterson, Brett M; White, Jonathan M; Donnelly, Paul S

    2010-03-21

    A new 1,3-diaminopropane bridged bis(thiosemicarbazone) ligand (H(4)L) has been synthesised. The new hexadentate ligand is capable of forming six coordinate complexes with rhenium(V), iron(III) and cobalt(III). In the case of the iron(III) and cobalt(III) complexes the ligand doubly deprotonates to give the monocations [Fe(III)(H(2)L)](+) and [Co(III)(H(2)L)](+) in which the metal ion is in a distorted octahedral environment. In the rhenium(V) complex the ligand loses four protons by deprotonation of both secondary amine nitrogen atoms to give [Re(V)(L)](+) with the metal ion in a distorted trigonal prismatic coordination environment. [Re(V)(L)](+) represents a rare example of a rhenium(V) complex that does not contain one of the ReO(3+), ReN(2+) or Re(NPh)(2+) cores. The new ligand and metal complexes have been characterised by a combination of NMR spectroscopy, X-ray crystallography, mass spectrometry and microanalysis. The electrochemistry of [Fe(III)(H(2)L)](+), [Co(III)(H(2)L)](+) and [Re(V)(L)](+) has been investigated by cyclic voltammetry with each complex undergoing a single electron reduction event. It is possible to prepare the rhenium(V) complex from ReOCl(3)(PPh(3))(2) or directly from [ReO(4)](-) with the addition of a reductant, which suggests the new ligand may be of interest in the development of rhenium radiopharmaceuticals.

  1. 40 CFR 417.185 - Standards of performance for new sources.

    Code of Federal Regulations, 2014 CFR

    2014-07-01

    ...) EFFLUENT GUIDELINES AND STANDARDS SOAP AND DETERGENT MANUFACTURING POINT SOURCE CATEGORY Manufacture of Drum Dried Detergents Subcategory § 417.185 Standards of performance for new sources. The...

  2. 40 CFR 417.185 - Standards of performance for new sources.

    Code of Federal Regulations, 2011 CFR

    2011-07-01

    ...) EFFLUENT GUIDELINES AND STANDARDS SOAP AND DETERGENT MANUFACTURING POINT SOURCE CATEGORY Manufacture of Drum Dried Detergents Subcategory § 417.185 Standards of performance for new sources. The...

  3. 40 CFR 417.185 - Standards of performance for new sources.

    Code of Federal Regulations, 2012 CFR

    2012-07-01

    ...) EFFLUENT GUIDELINES AND STANDARDS SOAP AND DETERGENT MANUFACTURING POINT SOURCE CATEGORY Manufacture of Drum Dried Detergents Subcategory § 417.185 Standards of performance for new sources. The...

  4. 40 CFR 417.185 - Standards of performance for new sources.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ...) EFFLUENT GUIDELINES AND STANDARDS SOAP AND DETERGENT MANUFACTURING POINT SOURCE CATEGORY Manufacture of Drum Dried Detergents Subcategory § 417.185 Standards of performance for new sources. The...

  5. 40 CFR 417.185 - Standards of performance for new sources.

    Code of Federal Regulations, 2013 CFR

    2013-07-01

    ...) EFFLUENT GUIDELINES AND STANDARDS SOAP AND DETERGENT MANUFACTURING POINT SOURCE CATEGORY Manufacture of Drum Dried Detergents Subcategory § 417.185 Standards of performance for new sources. The...

  6. Effect of Iron and Carbonation of the Diffusion of Iodine and Rhenium in Waste Encasement Concrete and Soil Fill Material under Hydraulically Unsaturated Conditions

    SciTech Connect

    Wellman, Dawn M.; Parker, Kent E.; Powers, Laura; Whyatt, Greg A.; Clayton, Libby N.; Mattigod, Shas V.; Wood, Marcus I.

    2008-07-31

    Assessing long-term performance of Category 3 cement wasteforms and accurate prediction for radionuclide encasement requires knowledge of the radionuclide-cement interactions and mechanisms of retention (i.e. sorption or precipitation). A set of sediment-concrete half-cell diffusion experiments was conducted under unsaturated conditions (4% and 7% by weight moisture content) using carbonated and non-carbonated concrete-soil half-cells. Results indicate the behavior of rhenium and iodine release was comparable within a given half-cell test. Diffusivity in soil is a function of moisture content; a 3% increase in moisture content affords a one to two order of magnitude increase in diffusivity. Release of iodine and rhenium was 1 to 3 orders of magnitude less from non-carbonated, relative to carbonated, concrete monoliths. Inclusion of iron in non-carbonate monoliths resulted in the lowest concrete diffusivity values for both iodine and rhenium. This suggests that in the presence of iron, iodine and rhenium are converted to reduced species, which are less soluble and better retained within the concrete monolith. The release of iodine and rhenium was greatest from iron-bearing, carbonated concrete monoliths, suggesting carbonation negates the effect of iron on the retention of iodine and rhenium within concrete monoliths. This is likely due to enhanced formation of microcracks in the presence of iron, which provide preferential paths for contaminant migration. Although the release of iodine and rhenium were greatest from carbonated concrete monoliths containing iron, the migration of iodine and rhenium within a given half-cell is dependent on the moisture content, soil diffusivity, and diffusing species.

  7. The Structures of the C185S and C185A Mutants of Sulfite Oxidase Reveal Rearrangement of the Active Site

    SciTech Connect

    Qiu, James A.; Wilson, Heather L.; Pushie, M. Jake; Kisker, Caroline; George, Graham N.; Rajagopalan, K.V.

    2010-11-03

    Sulfite oxidase (SO) catalyzes the physiologically critical conversion of sulfite to sulfate. Enzymatic activity is dependent on the presence of the metal molybdenum complexed with a pyranopterin-dithiolene cofactor termed molybdopterin. Comparison of the amino acid sequences of SOs from a variety of sources has identified a single conserved Cys residue essential for catalytic activity. The crystal structure of chicken liver sulfite oxidase indicated that this residue, Cys185 in chicken SO, coordinates the Mo atom in the active site. To improve our understanding of the role of this residue in the catalytic mechanism of sulfite oxidase, serine and alanine variants at position 185 of recombinant chicken SO were generated. Spectroscopic and kinetic studies indicate that neither variant is capable of sulfite oxidation. The crystal structure of the C185S variant was determined to 1.9 {angstrom} resolution and to 2.4 {angstrom} resolution in the presence of sulfite, and the C185A variant to 2.8 {angstrom} resolution. The structures of the C185S and C185A variants revealed that neither the Ser or Ala side chains appeared to closely interact with the Mo atom and that a third oxo group replaced the usual cysteine sulfur ligand at the Mo center, confirming earlier extended X-ray absorption fine structure spectroscopy (EXAFS) work on the human C207S mutant. An unexpected result was that in the C185S variant, in the absence of sulfite, the active site residue Tyr322 became disordered as did the loop region flanking it. In the C185S variant crystallized in the presence of sulfite, the Tyr322 residue relocalized to the active site. The C185A variant structure also indicated the presence of a third oxygen ligand; however, Tyr322 remained in the active site. EXAFS studies of the Mo coordination environment indicate the Mo atom is in the oxidized Mo{sup VI} state in both the C185S and C185A variants of chicken SO and show the expected trioxodithiolene active site. Density

  8. Quantitative experimental determination of the solid solution hardening potential of rhenium, tungsten and molybdenum in single-crystal nickel-based superalloys

    DOE PAGES

    Fleischmann, Ernst; Miller, Michael K.; Affeldt, Ernst; ...

    2015-01-31

    Here, the solid-solution hardening potential of the refractory elements rhenium, tungsten and molybdenum in the matrix of single-crystal nickel-based superalloys was experimentally quantified. Single-phase alloys with the composition of the nickel solid-solution matrix of superalloys were cast as single crystals, and tested in creep at 980 °C and 30–75 MPa. The use of single-phase single-crystalline material ensures very clean data because no grain boundary or particle strengthening effects interfere with the solid-solution hardening. This makes it possible to quantify the amount of rhenium, tungsten and molybdenum necessary to reduce the creep rate by a factor of 10. Rhenium is moremore » than two times more effective for matrix strengthening than either tungsten or molybdenum. The existence of rhenium clusters as a possible reason for the strong strengthening effect is excluded as a result of atom probe tomography measurements. If the partitioning coefficient of rhenium, tungsten and molybdenum between the γ matrix and the γ' precipitates is taken into account, the effectiveness of the alloying elements in two-phase superalloys can be calculated and the rhenium effect can be explained.« less

  9. Quantitative experimental determination of the solid solution hardening potential of rhenium, tungsten and molybdenum in single-crystal nickel-based superalloys

    SciTech Connect

    Fleischmann, Ernst; Miller, Michael K.; Affeldt, Ernst; Glatzel, Uwe

    2015-01-31

    Here, the solid-solution hardening potential of the refractory elements rhenium, tungsten and molybdenum in the matrix of single-crystal nickel-based superalloys was experimentally quantified. Single-phase alloys with the composition of the nickel solid-solution matrix of superalloys were cast as single crystals, and tested in creep at 980 °C and 30–75 MPa. The use of single-phase single-crystalline material ensures very clean data because no grain boundary or particle strengthening effects interfere with the solid-solution hardening. This makes it possible to quantify the amount of rhenium, tungsten and molybdenum necessary to reduce the creep rate by a factor of 10. Rhenium is more than two times more effective for matrix strengthening than either tungsten or molybdenum. The existence of rhenium clusters as a possible reason for the strong strengthening effect is excluded as a result of atom probe tomography measurements. If the partitioning coefficient of rhenium, tungsten and molybdenum between the γ matrix and the γ' precipitates is taken into account, the effectiveness of the alloying elements in two-phase superalloys can be calculated and the rhenium effect can be explained.

  10. 21 CFR 58.185 - Reporting of nonclinical laboratory study results.

    Code of Federal Regulations, 2014 CFR

    2014-04-01

    ... 21 Food and Drugs 1 2014-04-01 2014-04-01 false Reporting of nonclinical laboratory study results. 58.185 Section 58.185 Food and Drugs FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES GENERAL GOOD LABORATORY PRACTICE FOR NONCLINICAL LABORATORY STUDIES Records and Reports §...

  11. 21 CFR 58.185 - Reporting of nonclinical laboratory study results.

    Code of Federal Regulations, 2011 CFR

    2011-04-01

    ... 21 Food and Drugs 1 2011-04-01 2011-04-01 false Reporting of nonclinical laboratory study results. 58.185 Section 58.185 Food and Drugs FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES GENERAL GOOD LABORATORY PRACTICE FOR NONCLINICAL LABORATORY STUDIES Records and Reports §...

  12. 21 CFR 58.185 - Reporting of nonclinical laboratory study results.

    Code of Federal Regulations, 2010 CFR

    2010-04-01

    ... 21 Food and Drugs 1 2010-04-01 2010-04-01 false Reporting of nonclinical laboratory study results. 58.185 Section 58.185 Food and Drugs FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES GENERAL GOOD LABORATORY PRACTICE FOR NONCLINICAL LABORATORY STUDIES Records and Reports §...

  13. 40 CFR 436.185 - Standards of performance for new sources.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ... 40 Protection of Environment 29 2010-07-01 2010-07-01 false Standards of performance for new sources. 436.185 Section 436.185 Protection of Environment ENVIRONMENTAL PROTECTION AGENCY (CONTINUED) EFFLUENT GUIDELINES AND STANDARDS MINERAL MINING AND PROCESSING POINT SOURCE CATEGORY Phosphate...

  14. 47 CFR 90.185 - Multiple licensing of radio transmitting equipment in the mobile radio service.

    Code of Federal Regulations, 2013 CFR

    2013-10-01

    ... 47 Telecommunication 5 2013-10-01 2013-10-01 false Multiple licensing of radio transmitting equipment in the mobile radio service. 90.185 Section 90.185 Telecommunication FEDERAL COMMUNICATIONS COMMISSION (CONTINUED) SAFETY AND SPECIAL RADIO SERVICES PRIVATE LAND MOBILE RADIO SERVICES...

  15. 47 CFR 90.185 - Multiple licensing of radio transmitting equipment in the mobile radio service.

    Code of Federal Regulations, 2011 CFR

    2011-10-01

    ... 47 Telecommunication 5 2011-10-01 2011-10-01 false Multiple licensing of radio transmitting equipment in the mobile radio service. 90.185 Section 90.185 Telecommunication FEDERAL COMMUNICATIONS COMMISSION (CONTINUED) SAFETY AND SPECIAL RADIO SERVICES PRIVATE LAND MOBILE RADIO SERVICES...

  16. 47 CFR 90.185 - Multiple licensing of radio transmitting equipment in the mobile radio service.

    Code of Federal Regulations, 2014 CFR

    2014-10-01

    ... 47 Telecommunication 5 2014-10-01 2014-10-01 false Multiple licensing of radio transmitting equipment in the mobile radio service. 90.185 Section 90.185 Telecommunication FEDERAL COMMUNICATIONS COMMISSION (CONTINUED) SAFETY AND SPECIAL RADIO SERVICES PRIVATE LAND MOBILE RADIO SERVICES...

  17. 47 CFR 90.185 - Multiple licensing of radio transmitting equipment in the mobile radio service.

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    ... 47 Telecommunication 5 2010-10-01 2010-10-01 false Multiple licensing of radio transmitting equipment in the mobile radio service. 90.185 Section 90.185 Telecommunication FEDERAL COMMUNICATIONS COMMISSION (CONTINUED) SAFETY AND SPECIAL RADIO SERVICES PRIVATE LAND MOBILE RADIO SERVICES...

  18. 47 CFR 90.185 - Multiple licensing of radio transmitting equipment in the mobile radio service.

    Code of Federal Regulations, 2012 CFR

    2012-10-01

    ... 47 Telecommunication 5 2012-10-01 2012-10-01 false Multiple licensing of radio transmitting equipment in the mobile radio service. 90.185 Section 90.185 Telecommunication FEDERAL COMMUNICATIONS COMMISSION (CONTINUED) SAFETY AND SPECIAL RADIO SERVICES PRIVATE LAND MOBILE RADIO SERVICES...

  19. 40 CFR 96.185 - CAIR opt-in permit contents.

    Code of Federal Regulations, 2011 CFR

    2011-07-01

    ... 40 Protection of Environment 21 2011-07-01 2011-07-01 false CAIR opt-in permit contents. 96.185 Section 96.185 Protection of Environment ENVIRONMENTAL PROTECTION AGENCY (CONTINUED) AIR PROGRAMS (CONTINUED) NOX BUDGET TRADING PROGRAM AND CAIR NOX AND SO2 TRADING PROGRAMS FOR STATE IMPLEMENTATION...

  20. 40 CFR 96.185 - CAIR opt-in permit contents.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ... 40 Protection of Environment 20 2010-07-01 2010-07-01 false CAIR opt-in permit contents. 96.185 Section 96.185 Protection of Environment ENVIRONMENTAL PROTECTION AGENCY (CONTINUED) AIR PROGRAMS (CONTINUED) NOX BUDGET TRADING PROGRAM AND CAIR NOX AND SO2 TRADING PROGRAMS FOR STATE IMPLEMENTATION...

  1. 47 CFR 0.185 - Responsibilities of the bureaus and staff offices.

    Code of Federal Regulations, 2012 CFR

    2012-10-01

    ...: (a) To keep the Chief, Public Safety and Homeland Security Bureau informed of the investigation... 47 Telecommunication 1 2012-10-01 2012-10-01 false Responsibilities of the bureaus and staff offices. 0.185 Section 0.185 Telecommunication FEDERAL COMMUNICATIONS COMMISSION GENERAL...

  2. 42 CFR 416.185 - Process for establishing a new class of new technology IOLs.

    Code of Federal Regulations, 2012 CFR

    2012-10-01

    ... 42 Public Health 3 2012-10-01 2012-10-01 false Process for establishing a new class of new technology IOLs. 416.185 Section 416.185 Public Health CENTERS FOR MEDICARE & MEDICAID SERVICES, DEPARTMENT OF HEALTH AND HUMAN SERVICES (CONTINUED) MEDICARE PROGRAM (CONTINUED) AMBULATORY SURGICAL...

  3. 14 CFR 121.185 - Airplanes: Reciprocating engine-powered: Landing limitations: Destination airport.

    Code of Federal Regulations, 2010 CFR

    2010-01-01

    ...: Landing limitations: Destination airport. 121.185 Section 121.185 Aeronautics and Space FEDERAL AVIATION...: Destination airport. (a) Except as provided in paragraph (b) of this section no person operating a... determining the allowable landing weight at the destination airport the following is assumed: (1) The...

  4. 14 CFR 121.185 - Airplanes: Reciprocating engine-powered: Landing limitations: Destination airport.

    Code of Federal Regulations, 2011 CFR

    2011-01-01

    ...: Landing limitations: Destination airport. 121.185 Section 121.185 Aeronautics and Space FEDERAL AVIATION...: Destination airport. (a) Except as provided in paragraph (b) of this section no person operating a... determining the allowable landing weight at the destination airport the following is assumed: (1) The...

  5. 46 CFR 185.730 - Servicing of inflatable liferafts, inflatable buoyant apparatus, inflatable life jackets, and...

    Code of Federal Regulations, 2013 CFR

    2013-10-01

    ... apparatus, inflatable life jackets, and inflated rescue boats. 185.730 Section 185.730 Shipping COAST GUARD... liferafts, inflatable buoyant apparatus, inflatable life jackets, and inflated rescue boats. (a) An... inflated rescue boats must be in accordance with the manufacturer's instructions. All repairs must be...

  6. 46 CFR 185.730 - Servicing of inflatable liferafts, inflatable buoyant apparatus, inflatable life jackets, and...

    Code of Federal Regulations, 2012 CFR

    2012-10-01

    ... apparatus, inflatable life jackets, and inflated rescue boats. 185.730 Section 185.730 Shipping COAST GUARD... liferafts, inflatable buoyant apparatus, inflatable life jackets, and inflated rescue boats. (a) An... inflated rescue boats must be in accordance with the manufacturer's instructions. All repairs must be...

  7. 46 CFR 185.730 - Servicing of inflatable liferafts, inflatable buoyant apparatus, inflatable life jackets, and...

    Code of Federal Regulations, 2014 CFR

    2014-10-01

    ... apparatus, inflatable life jackets, and inflated rescue boats. 185.730 Section 185.730 Shipping COAST GUARD... liferafts, inflatable buoyant apparatus, inflatable life jackets, and inflated rescue boats. (a) An... inflated rescue boats must be in accordance with the manufacturer's instructions. All repairs must be...

  8. 40 CFR 436.185 - Standards of performance for new sources.

    Code of Federal Regulations, 2011 CFR

    2011-07-01

    ... 40 Protection of Environment 30 2011-07-01 2011-07-01 false Standards of performance for new sources. 436.185 Section 436.185 Protection of Environment ENVIRONMENTAL PROTECTION AGENCY (CONTINUED) EFFLUENT GUIDELINES AND STANDARDS MINERAL MINING AND PROCESSING POINT SOURCE CATEGORY Phosphate...

  9. 20 CFR 402.185 - Waiver or reduction of fees in the public interest.

    Code of Federal Regulations, 2012 CFR

    2012-04-01

    ... interest. 402.185 Section 402.185 Employees' Benefits SOCIAL SECURITY ADMINISTRATION AVAILABILITY OF... demonstrate that likelihood, while such a claim by a representative of the news media is better evidence. (4... other associations. The interest of a representative of the news media in using the information for...

  10. 20 CFR 402.185 - Waiver or reduction of fees in the public interest.

    Code of Federal Regulations, 2010 CFR

    2010-04-01

    ... interest. 402.185 Section 402.185 Employees' Benefits SOCIAL SECURITY ADMINISTRATION AVAILABILITY OF... demonstrate that likelihood, while such a claim by a representative of the news media is better evidence. (4... the requester's commercial interest and, if so, whether this effect outweighs the advancement of...

  11. 30 CFR 18.5 - Equipment for which certification will be issued.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ... 30 Mineral Resources 1 2010-07-01 2010-07-01 false Equipment for which certification will be issued. 18.5 Section 18.5 Mineral Resources MINE SAFETY AND HEALTH ADMINISTRATION, DEPARTMENT OF LABOR TESTING, EVALUATION, AND APPROVAL OF MINING PRODUCTS ELECTRIC MOTOR-DRIVEN MINE EQUIPMENT AND...

  12. 20 CFR 402.185 - Waiver or reduction of fees in the public interest.

    Code of Federal Regulations, 2013 CFR

    2013-04-01

    ... interest. 402.185 Section 402.185 Employees' Benefits SOCIAL SECURITY ADMINISTRATION AVAILABILITY OF... demonstrate that likelihood, while such a claim by a representative of the news media is better evidence. (4... other associations. The interest of a representative of the news media in using the information for...

  13. 20 CFR 402.185 - Waiver or reduction of fees in the public interest.

    Code of Federal Regulations, 2014 CFR

    2014-04-01

    ... interest. 402.185 Section 402.185 Employees' Benefits SOCIAL SECURITY ADMINISTRATION AVAILABILITY OF... demonstrate that likelihood, while such a claim by a representative of the news media is better evidence. (4... other associations. The interest of a representative of the news media in using the information for...

  14. The cellular factor TRP-185 regulates RNA polymerase II binding to HIV-1 TAR RNA.

    PubMed Central

    Wu-Baer, F; Lane, W S; Gaynor, R B

    1995-01-01

    Activation of HIV-1 gene expression by the transactivator Tat is dependent on an RNA regulatory element located downstream of the transcription initiation site known as TAR. To characterize cellular factors that bind to TAR RNA and are involved in the regulation of HIV-1 transcription, HeLa nuclear extract was fractionated and RNA gel-retardation analysis was performed. This analysis indicated that only two cellular factors, RNA polymerase II and the previously characterized TAR RNA loop binding protein TRP-185, were capable of binding specifically to TAR RNA. To elucidate the function of TRP-185, it was purified from HeLa nuclear extract, amino acid microsequence analysis was performed and a cDNA encoding TRP-185 was isolated. TRP-185 is a novel protein of 1621 amino acids which contains a leucine zipper and potentially a novel RNA binding motif. In gel-retardation assays, the binding of both recombinant TRP-185 and RNA polymerase II was dependent on the presence of an additional group of proteins designated cellular cofactors. Both the TAR RNA loop and bulge sequences were critical for RNA polymerase II binding, while TRP-185 binding was dependent only on TAR RNA loop sequences. Since binding of TRP-185 and RNA polymerase II to TAR RNA was found to be mutually exclusive, our results suggest that TRP-185 may function either alone or in conjunction with Tat to disengage RNA polymerase II which is stalled upon binding to nascently synthesized TAR RNA during transcriptional elongation. Images PMID:8846792

  15. 33 CFR 207.185 - Taylors Bayou, Tex., Beaumont Navigation District Lock; use, administration, and navigation.

    Code of Federal Regulations, 2014 CFR

    2014-07-01

    ... 33 Navigation and Navigable Waters 3 2014-07-01 2014-07-01 false Taylors Bayou, Tex., Beaumont Navigation District Lock; use, administration, and navigation. 207.185 Section 207.185 Navigation and Navigable Waters CORPS OF ENGINEERS, DEPARTMENT OF THE ARMY, DEPARTMENT OF DEFENSE NAVIGATION...

  16. 46 CFR 185.230 - Report of accident to aid to navigation.

    Code of Federal Regulations, 2013 CFR

    2013-10-01

    ... 46 Shipping 7 2013-10-01 2013-10-01 false Report of accident to aid to navigation. 185.230 Section 185.230 Shipping COAST GUARD, DEPARTMENT OF HOMELAND SECURITY (CONTINUED) SMALL PASSENGER VESSELS... aid to navigation. Whenever a vessel collides with a buoy, or other aid to navigation under...

  17. 46 CFR 185.230 - Report of accident to aid to navigation.

    Code of Federal Regulations, 2011 CFR

    2011-10-01

    ... 46 Shipping 7 2011-10-01 2011-10-01 false Report of accident to aid to navigation. 185.230 Section 185.230 Shipping COAST GUARD, DEPARTMENT OF HOMELAND SECURITY (CONTINUED) SMALL PASSENGER VESSELS... aid to navigation. Whenever a vessel collides with a buoy, or other aid to navigation under...

  18. 46 CFR 185.230 - Report of accident to aid to navigation.

    Code of Federal Regulations, 2014 CFR

    2014-10-01

    ... 46 Shipping 7 2014-10-01 2014-10-01 false Report of accident to aid to navigation. 185.230 Section 185.230 Shipping COAST GUARD, DEPARTMENT OF HOMELAND SECURITY (CONTINUED) SMALL PASSENGER VESSELS... aid to navigation. Whenever a vessel collides with a buoy, or other aid to navigation under...

  19. 46 CFR 185.230 - Report of accident to aid to navigation.

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    ... 46 Shipping 7 2010-10-01 2010-10-01 false Report of accident to aid to navigation. 185.230 Section 185.230 Shipping COAST GUARD, DEPARTMENT OF HOMELAND SECURITY (CONTINUED) SMALL PASSENGER VESSELS... aid to navigation. Whenever a vessel collides with a buoy, or other aid to navigation under...

  20. 33 CFR 207.185 - Taylors Bayou, Tex., Beaumont Navigation District Lock; use, administration, and navigation.

    Code of Federal Regulations, 2011 CFR

    2011-07-01

    ... 33 Navigation and Navigable Waters 3 2011-07-01 2011-07-01 false Taylors Bayou, Tex., Beaumont Navigation District Lock; use, administration, and navigation. 207.185 Section 207.185 Navigation and Navigable Waters CORPS OF ENGINEERS, DEPARTMENT OF THE ARMY, DEPARTMENT OF DEFENSE NAVIGATION...

  1. 33 CFR 207.185 - Taylors Bayou, Tex., Beaumont Navigation District Lock; use, administration, and navigation.

    Code of Federal Regulations, 2013 CFR

    2013-07-01

    ... 33 Navigation and Navigable Waters 3 2013-07-01 2013-07-01 false Taylors Bayou, Tex., Beaumont Navigation District Lock; use, administration, and navigation. 207.185 Section 207.185 Navigation and Navigable Waters CORPS OF ENGINEERS, DEPARTMENT OF THE ARMY, DEPARTMENT OF DEFENSE NAVIGATION...

  2. 46 CFR 185.230 - Report of accident to aid to navigation.

    Code of Federal Regulations, 2012 CFR

    2012-10-01

    ... 46 Shipping 7 2012-10-01 2012-10-01 false Report of accident to aid to navigation. 185.230 Section 185.230 Shipping COAST GUARD, DEPARTMENT OF HOMELAND SECURITY (CONTINUED) SMALL PASSENGER VESSELS... aid to navigation. Whenever a vessel collides with a buoy, or other aid to navigation under...

  3. 33 CFR 207.185 - Taylors Bayou, Tex., Beaumont Navigation District Lock; use, administration, and navigation.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ... 33 Navigation and Navigable Waters 3 2010-07-01 2010-07-01 false Taylors Bayou, Tex., Beaumont Navigation District Lock; use, administration, and navigation. 207.185 Section 207.185 Navigation and Navigable Waters CORPS OF ENGINEERS, DEPARTMENT OF THE ARMY, DEPARTMENT OF DEFENSE NAVIGATION...

  4. 33 CFR 207.185 - Taylors Bayou, Tex., Beaumont Navigation District Lock; use, administration, and navigation.

    Code of Federal Regulations, 2012 CFR

    2012-07-01

    ... 33 Navigation and Navigable Waters 3 2012-07-01 2012-07-01 false Taylors Bayou, Tex., Beaumont Navigation District Lock; use, administration, and navigation. 207.185 Section 207.185 Navigation and Navigable Waters CORPS OF ENGINEERS, DEPARTMENT OF THE ARMY, DEPARTMENT OF DEFENSE NAVIGATION...

  5. 46 CFR 185.614 - Portable watertight containers for distress flares and smoke signals.

    Code of Federal Regulations, 2011 CFR

    2011-10-01

    ... smoke signals. 185.614 Section 185.614 Shipping COAST GUARD, DEPARTMENT OF HOMELAND SECURITY (CONTINUED... watertight containers for distress flares and smoke signals. Portable watertight containers for distress flares and smoke signals shall be of a bright color, and containers shall be clearly marked in...

  6. 46 CFR 185.614 - Portable watertight containers for distress flares and smoke signals.

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    ... smoke signals. 185.614 Section 185.614 Shipping COAST GUARD, DEPARTMENT OF HOMELAND SECURITY (CONTINUED... watertight containers for distress flares and smoke signals. Portable watertight containers for distress flares and smoke signals shall be of a bright color, and containers shall be clearly marked in...

  7. 46 CFR 185.614 - Portable watertight containers for distress flares and smoke signals.

    Code of Federal Regulations, 2013 CFR

    2013-10-01

    ... smoke signals. 185.614 Section 185.614 Shipping COAST GUARD, DEPARTMENT OF HOMELAND SECURITY (CONTINUED... watertight containers for distress flares and smoke signals. Portable watertight containers for distress flares and smoke signals shall be of a bright color, and containers shall be clearly marked in...

  8. 46 CFR 185.614 - Portable watertight containers for distress flares and smoke signals.

    Code of Federal Regulations, 2014 CFR

    2014-10-01

    ... smoke signals. 185.614 Section 185.614 Shipping COAST GUARD, DEPARTMENT OF HOMELAND SECURITY (CONTINUED... watertight containers for distress flares and smoke signals. Portable watertight containers for distress flares and smoke signals shall be of a bright color, and containers shall be clearly marked in...

  9. 46 CFR 185.614 - Portable watertight containers for distress flares and smoke signals.

    Code of Federal Regulations, 2012 CFR

    2012-10-01

    ... smoke signals. 185.614 Section 185.614 Shipping COAST GUARD, DEPARTMENT OF HOMELAND SECURITY (CONTINUED... watertight containers for distress flares and smoke signals. Portable watertight containers for distress flares and smoke signals shall be of a bright color, and containers shall be clearly marked in...

  10. 21 CFR 58.185 - Reporting of nonclinical laboratory study results.

    Code of Federal Regulations, 2013 CFR

    2013-04-01

    .... 58.185 Section 58.185 Food and Drugs FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN... description of the methods used. (7) A description of the test system used. Where applicable, the final report shall include the number of animals used, sex, body weight range, source of supply, species, strain...

  11. 21 CFR 58.185 - Reporting of nonclinical laboratory study results.

    Code of Federal Regulations, 2012 CFR

    2012-04-01

    .... 58.185 Section 58.185 Food and Drugs FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN... description of the methods used. (7) A description of the test system used. Where applicable, the final report shall include the number of animals used, sex, body weight range, source of supply, species, strain...

  12. 41 CFR 102-3.185 - What does this subpart require agencies to do?

    Code of Federal Regulations, 2011 CFR

    2011-01-01

    ... 41 Public Contracts and Property Management 3 2011-01-01 2011-01-01 false What does this subpart require agencies to do? 102-3.185 Section 102-3.185 Public Contracts and Property Management Federal Property Management Regulations System (Continued) FEDERAL MANAGEMENT REGULATION GENERAL 3-FEDERAL...

  13. 41 CFR 102-3.185 - What does this subpart require agencies to do?

    Code of Federal Regulations, 2012 CFR

    2012-01-01

    ... 41 Public Contracts and Property Management 3 2012-01-01 2012-01-01 false What does this subpart require agencies to do? 102-3.185 Section 102-3.185 Public Contracts and Property Management Federal Property Management Regulations System (Continued) FEDERAL MANAGEMENT REGULATION GENERAL 3-FEDERAL...

  14. 41 CFR 102-3.185 - What does this subpart require agencies to do?

    Code of Federal Regulations, 2013 CFR

    2013-07-01

    ... 41 Public Contracts and Property Management 3 2013-07-01 2013-07-01 false What does this subpart require agencies to do? 102-3.185 Section 102-3.185 Public Contracts and Property Management Federal Property Management Regulations System (Continued) FEDERAL MANAGEMENT REGULATION GENERAL 3-FEDERAL...

  15. Mechanism of cyanoacetylene photochemistry at 185 and 254 nm

    NASA Technical Reports Server (NTRS)

    Clarke, D. W.; Ferris, J. P.

    1996-01-01

    The role of cyanoacetylene (HC3N) in the atmospheric photochemistry of Titan and its relevance to polymer formation are discussed. Investigation of the relative light absorption of HC3N, acetylene (C2H2), and diacetylene (C4H2) revealed that HC3N is an important absorber of UV light in the 205- to 225-nanometer wavelength region in Titan's polar regions. Laboratory studies established that photolysis of C2H2 initiates the polymerization of HC3N even though the HC3N is not absorbing the UV light. Quantum yield measurements establish that HC3N is 2-5 times as reactive as C2H2 for polymer formation. Photolysis of HC3N with 185-nanometer light in the presence of N2, H2, Ar, or CF4 results in a decrease in the yield of 1,3,5-tricyanobenzene (1,3,5-tcb), while photolysis in the presence of CH4, C2H6, or n-C4H10 results in an increase in 1,3,5-tcb. The rate of loss of HC3N is increased by all gases except H2, where it is unchanged. It was not possible to detect 1,3,5-tcb as a photoproduct when the partial pressure of HC3N was decreased to 1 torr. Photolysis of HC3N with 254-nanometer light in the presence of H2 or N2 results in the formation of 1,2,4-tcb, while photolysis in the presence of CH4, C2H6, or n-C4H10 results in the formation of increasing amounts of 1,3,5-tcb. Mechanisms for the formation of polymers are presented.

  16. The E3 ubiquitin ligase RNF185 facilitates the cGAS-mediated innate immune response

    PubMed Central

    Lv, Zhongshi; Mao, Zhaomin; Tang, Yijun; Kong, Xiufang; Li, Senlin; Cui, Ye; Liu, Heng; Zhang, Lele; Zhang, Xiaojie; Jiang, Lindi; Zhou, Qin

    2017-01-01

    The cyclic GMP-AMP synthase (cGAS), upon cytosolic DNA stimulation, catalyzes the formation of the second messenger 2′3′-cGAMP, which then binds to stimulator of interferon genes (STING) and activates downstream signaling. It remains to be elucidated how the cGAS enzymatic activity is modulated dynamically. Here, we reported that the ER ubiquitin ligase RNF185 interacted with cGAS during HSV-1 infection. Ectopic-expression or knockdown of RNF185 respectively enhanced or impaired the IRF3-responsive gene expression. Mechanistically, RNF185 specifically catalyzed the K27-linked poly-ubiquitination of cGAS, which promoted its enzymatic activity. Additionally, Systemic Lupus Erythematosus (SLE) patients displayed elevated expression of RNF185 mRNA. Collectively, this study uncovers RNF185 as the first E3 ubiquitin ligase of cGAS, shedding light on the regulation of cGAS activity in innate immune responses. PMID:28273161

  17. Probiotic Characteristics of Lactobacillus plantarum FH185 Isolated from Human Feces

    PubMed Central

    2015-01-01

    Lactobacillus plantarum FH185 was isolated from the feces of healthy adults. In our previous study, L. plantarum FH185 was demonstrated that it has anti-obesity effect in the in vitro and in vivo test. In order to determine its potential for use as a probiotic, we investigated the physiological characteristics of L. plantarum FH185. The optimum growth temperature of L. plantarum FH185 was 40℃. L. plantarum FH185 showed higher sensitivity to novobiocin in a comparison of fifteen different antibiotics and showed higher resistance to polymyxin B and vancomycin. It also showed higher β-galactosidase and N-acetyl-β-glucosaminidase activities. Moreover, it was comparatively tolerant to bile juice and acid, and inhibited the growths of Salmonella Typhimurium and Staphylococcus aureus with rates of 44.76% and 53.88%, respectively. It also showed high adhesion activity to HT-29 cells compared to L. rhamnosus GG. PMID:26761889

  18. Osmium isotopes in Ivory Coast tektites: Confirmation of a meteoritic component and rhenium depletion

    NASA Technical Reports Server (NTRS)

    Koeberl, Christian; Shirey, Steven B.

    1993-01-01

    The sensitive negative thermal ionization mass spectrometry method was used for the measurement of concentrations and isotopic ratios of osmium and rhenium in four Ivory Coast tektites. These tektites have crustal major and trace element composition, as well as large negative epsilon(sub Nd)(-20) and positive epsilon(sub Sr)(+260 to +300) which are characteristic for old continental crust. Os concentrations ranging from 0.09 to 0.30 ppb were found, clearly much higher than average crustal values, Os-187/Os-186 ratios of about 1.2-1.7, and low Re-187/Os-186 ratios. These results show unambiguously the existence of a meteoritic component (on the order of 0.06%) in the Ivory Coast tektites. Low Re abundances are the result of fractionation of Re during the impact.

  19. Click-to-Chelate: development of technetium and rhenium-tricarbonyl labeled radiopharmaceuticals.

    PubMed

    Kluba, Christiane A; Mindt, Thomas L

    2013-03-12

    The Click-to-Chelate approach is a highly efficient strategy for the radiolabeling of molecules of medicinal interest with technetium and rhenium-tricarbonyl cores. Reaction of azide-functionalized molecules with alkyne prochelators by the Cu(I)-catalyzed azide-alkyne cycloaddition (CuAAC; click reaction) enables the simultaneous synthesis and conjugation of tridentate chelating systems for the stable complexation of the radiometals. In many cases, the functionalization of (bio)molecules with the ligand system and radiolabeling can be achieved by convenient one-pot procedures. Since its first report in 2006, Click-to-Chelate has been applied to the development of numerous novel radiotracers with promising potential for translation into the clinic. This review summarizes the use of the Click-to-Chelate approach in radiopharmaceutical sciences and provides a perspective for future applications.

  20. Incorporation and distribution of rhenium in a borosilicate glass melt heat treated in a sealed ampoule

    SciTech Connect

    Kim, Dong-Sang; Schweiger, Michael J.

    2013-07-25

    We investigated a mass balance of rhenium (used as a surrogate for technetium-99) in a borosilicate glass that was mixed with excess Re source (KReO4) beyond its solubility and heat treated in a vacuum-sealed fused silica ampoule. Distribution of Re in the bulk of the glass, in a salt phase formed on the melt surface, and in condensate material deposited on the ampoule wall was evaluated to understand the Re migration into different phases during the reaction between the molten glass and KReO4. The information gained from this study will contribute to an effort to understand the mechanism of technetium retention in or escape from glass melt during early stages of glass batch melting, which is a goal of the present series of studies.