Results 1 to 10 of about 87,624 (408)

Technetium and the third dredge up in AGB stars. I. Field stars [PDF]

Astron.Astrophys.411:533-542,2003, 2003
We searched for Tc in a sample of long period variables selected by stellar luminosity derived from Hipparcos parallaxes. Tc, as an unstable s-process element, is a good indicator for the evolutionary status of stars on the asymptotic giant branch (AGB).
Hron, J., Lebzelter, T.
arxiv   +3 more sources

Discovery of Yttrium, Zirconium, Niobium, Technetium, and Ruthenium Isotopes [PDF]

, 2011
Currently, thirty-four yttrium, thirty-five zirconium, thirty-four niobium, thirty-five technetium, and thirty-eight ruthenium isotopes have been observed and the discovery of these isotopes is discussed here. For each isotope a brief synopsis of the first refereed publication, including the production and identification method, is presented.
A. Nystrom, Ahrens, Antman, Arlt, Arlt, Asghar, Aston, Aston, Aston, Aston, Aston, Aston, Aten, Audi, Baró, Berg, Bernas, Bernas, Bohr, Born, Boyd, Boyd, Brady, Burgus, Butement, Butement, Cacciapuoti, Caretto Jr., Cheifetz, Clarke, De Jesus, De Vries, Della Negra, Delsasso, Deprun, Diamond, Doron, Doron, Dostrovsky, Downing, Dubridge, Duffield, Edwards, Eggen, Eidens, Ewald, Flegenheimer, Flegenheimer, Flegenheimer, Flegenheimer, Flegenheimer, Franz, Fritze, Ginepro, Glendenin, Glendenin, Goriely, Graefenstedt, Grawe, Griffiths, Grosse, Grummitt, Grummitt, Grüter, Gugelot, Gugelot, Gujrathi, Gunther, Götte, Hagberg, Hahn, Hahn, Hahn, Hahn, Hahn, Hahn, Hayden, Heiguchi, Helmholz, Hencheck, Hollander, Hopkins, Hopkins, Hotchkis, Huang, Hyde, Hübenthal, Hübenthal, Iafigliola, Jacobson, Janas, John, Kaba, Katcoff, Katcoff, Katcoff, Kienle, Knight, Korschinek, Korteling, Kundu, Kundu, Kuroyanagi, Lederer, Lederer, Leino, Liang, Lieber, Lister, Lister, Livingood, Livingood, Löbner, M. Thoennessen, Maurer, Maxia, Motta, Motta, Motta, Mukai, Nieckarz, Nishina, Ohnishi, Orth, Pecher, Penttilä, Perrier, Perrier, Pfeiffer, Pool, Riccato, Richardson, Robertson, Rudolph, Rykaczewski, Sagane, Sagane, Sagane, Seaborg, Seaborg, Seaborg, Seelmann–Eggebert, Segre, Selikson, Shizuma, Shizuma, Steinberg, Stewart, Stewart, Strominger, Sullivan, Takahashi, Thoennessen, Trautmann, Trautmann, Troutner, Vallis, Van der Wiel, Van Lieshout, Von Baeckmann, Votsilka, Watson, Wiles, Wohn, Yennello, Yu, Zaitseva, Zhou, Zingales, Äystö, Äystö   +170 more
arxiv   +3 more sources

Technetium Complexes and Radiopharmaceuticals with Scorpionate Ligands

Molecules, 2018
Scorpionate ligands have played a crucial role in the development of technetium chemistry and, recently, they have also fueled important advancements in the discovery of novel diagnostic imaging agents based on the γ-emitting radionuclide ...
Petra Martini, Micol Pasquali, Alessandra Boschi, Licia Uccelli, Melchiore Giganti, Adriano Duatti   +5 more
doaj   +2 more sources

The Henize sample of S stars. I. The technetium dichotomy [PDF]

Astron.Astrophys.345:127-136,1999, 1999
This paper is the first one in a series investigating the properties of the S stars belonging to the Henize sample (205 S stars with delta<-25 deg. and R<10.5) in order to derive the respective properties (like galactic distribution and relative frequencies) of intrinsic (i.e. genuine asymptotic giant branch) S stars and extrinsic (i.e.
Jorissen, A., Van Eck, S.
arxiv   +2 more sources

Substitutional 4d and 5d Impurities in Graphene [PDF]

, 2016
We describe the structural and electronic properties of graphene doped with substitutional impurities of 4d and 5d transition metals. The binding energy and distances for 4d and 5d metals in graphene show similar trends for the later groups in the periodic table, which is also well-known characteristic of 3d elements.
Aguilera-Granja, Faustino, Alonso-Lanza, Tomás, Ayuela, Andrés   +2 more
arxiv   +3 more sources

Period -- mass-loss rate relation of Miras with and without technetium [PDF]

, 2013
Aims: We report the discovery that Mira variables with and without absorption lines of the element technetium (Tc) occupy two different regions in a diagram of near- to mid-infrared colour versus pulsation period. Tc is an indicator of a recent or ongoing mixing event called the third dredge-up (3DUP), and the near- to mid-IR colour, such as the (K-[22]
Uttenthaler, Stefan
arxiv   +5 more sources

Nitrosyl and Thionitrosyl Complexes of Technetium and Rhenium and Their Reactions with Hydrotris(pyrazolyl)borates [PDF]

Molecules
The very limited number of structurally known thionitrosyl complexes of technetium was increased by the synthesis of [TcII(NS)Cl3(PPh3)2] (3) and [TcII(NS)Cl3(PPh3)(OPPh3)] (4) and their reaction products with hydrotris(pyrazolyl)borates, {HB(pzR)3 ...
Till Erik Sawallisch, Abdullah Abdulkader, Domenik Nowak, Adelheid Hagenbach, Ulrich Abram   +4 more
doaj   +2 more sources

Oldie but Goodie: Is Technetium-99m Still a Treasure Trove of Innovation for Medicine? A Patents Analysis (2000-2022).

Journal of Medicinal Chemistry, 2023
Technetium-99m is the workhorse of diagnostic nuclear medicine. The aim of the work is to analyze the technetium-99m patents since 2000 to photograph its innovation. QUESTEL's ORBIT Intelligence system was used for the collection of technetium inventions
M. Riondato, D. Rigamonti, P. Martini, C. Cittanti, A. Boschi, Luca Urso, L. Uccelli   +6 more
semanticscholar   +1 more source

Extracting Technetium from Neutral Molybdenum Solution with Activated Carbon Filber

Journal of Isotopes, 2021
The use of the chromatographic method to extract 99Tcm from the low specific activity 99Mo solution is an effective way to obtain medical isotope 99Tcm that meeting clinical requirements.
SONG Zhihao;ZHANG Yunhan;WANG Ning;GUO Hongli;ZHAO Hailong;GAO Xiang
doaj   +1 more source

Trends in coordination of rhenium organometallic complexes in the Protein Data Bank

IUCrJ, 2022
Radiopharmaceutical development has similar overall characteristics to any biomedical drug development requiring a compound's stability, aqueous solubility and selectivity to a specific disease site. However, organometallic complexes containing 188/186Re
Alice Brink, Francois J. F. Jacobs, John R. Helliwell   +2 more
doaj   +1 more source