Radioisotopes
alpha-MSH
A 13-amino acid peptide derived from proteolytic cleavage of ADRENOCORTICOTROPIC HORMONE, the N-terminal segment of ACTH. ACTH (1-13) is amidated at the C-terminal to form ACTH (1-13)NH2 which in turn is acetylated to form alpha-MSH in the secretory granules. Alpha-MSH stimulates the synthesis and distribution of MELANIN in MELANOCYTES in mammals and MELANOPHORES in lower vertebrates.
Organometallic Compounds
186Re-etidronate in breast cancer patients with metastatic bone pain. (1/195)
The aim of this study was to evaluate the efficacy of 186Re-1,1-hydroxyethylidene diphosphonate (etidronate) in breast cancer patients with painful bone metastases. METHODS: Thirty patients with advanced breast cancer who had metastatic bone pain were treated with 186Re-etidronate using different dosages in a noncomparative, open-label study. Twenty-four patients were evaluated for efficacy (6 patients had incomplete datasets). Dosages varied from 1295 to 2960 MBq (35 to 80 mCi). Efficacy was evaluated according to the multidimensional pain model using a paper-and-pencil diary. The diary was kept twice daily for 8-10 wk (2 wk before through 6-8 wk after 186Re-etidronate treatment). Response was determined with a strict criteria, in which pain intensity (PI), medication index (MI) and daily activities (DA) were core determinants. Response was defined as: (a) Reduced PI > or = 5% while MI and DA were at least constant; or (b) Reduced PI <25% in combination with improvement of MI or DA > or = 25%, without worsening of either factor. Duration of response should always exceed a minimum of 2 wk. RESULTS: Fifty-eight percent (n = 14) of all patients reported a response. The maximum follow-up period was 8 wk. Duration of response ranged from 2 to 8 wk (mean 4 wk). Patients (14/24) not only experienced considerable pain reduction, but in 12 patients this was also accompanied by noteworthy reduction in MI (> or = 25%). No clear dose-response relationship was found. CONCLUSION: With strict pain assessment criteria, 186Re-etidronate showed a response of 58% in the palliative treatment of metastatic bone pain originating from breast cancer. (+info)Combination 186Re-HEDP and cisplatin supra-additive treatment effects in prostate cancer cells. (2/195)
Radionuclide therapy has proven to be an efficacious palliative treatment for metastatic prostate cancer. Its potential therapeutic possibilities may be substantially increased by combining it with effective radiosensitizing drugs. METHODS: This study explores the radiosensitizing properties of cisplatin when combined with 186Re-labeled hydroxyethylidene diphosphonate (HEDP) in the treatment of R3327-MATLyLu prostate cancer cells in vitro. A concomitant incubation during 4 d, combining various concentrations of cisplatin (0, 0.42, 0.83 and 1.67 micromol/L) and 186Re-HEDP (0, 1.84 and 3.69 MBq/mL [0, 50 and 100 microCi/mL, respectively]) was followed by the determination of the cell numbers surviving and the replating of these cells in semisolid agar. RESULTS: The surviving fraction of clonogenic tumor cells after combination treatment clearly showed synergism when analyzed by a panel of three different published analytical methods. In addition, analysis of variance demonstrated a significant interaction between radionuclide therapy and cisplatin-based chemotherapy (P < 0.001). Treatment with 186Re-HEDP and cisplatin by sequential incubation yielded similar, but never superior results. CONCLUSION: It is concluded that radionuclide therapy in combination with cisplatin is able, in principle, to improve therapeutic success rate in metastatic prostate cancer in a more than additive way. (+info)Rhenium-186-labeled hydroxyethylidene diphosphonate dosimetry and dosing guidelines for the palliation of skeletal metastases from androgen-independent prostate cancer. (3/195)
Rhenium-186 (tin)-labeled hydroxyethylidene diphosphonate (186Re-labeled HEDP) was evaluated in 27 men with progressive androgen-independent prostate cancer and bone metastases. Administered activities ranged from 1251 to 4336 MBq (33.8-117.2 mCi). The primary objectives were to assess tumor targeting, normal organ dosimetry, and safety. Antitumor effects were assessed by posttherapy changes in prostate-specific antigen and, when present, palliation of pain. Whole-body kinetics, blood and kidney clearance, skeletal dose, marrow dose, and urinary excretion of the isotope were assessed. Targeting of skeletal disease was observed over the period of quantification (4-168 h). Radiation doses to whole body, bladder, and kidney were well tolerated. The dose-limiting toxicity was myelosuppression (grade III) at 4107 MBq (111 mCi) and grade II at 296 MBq (80 mCi). Probe clearance (whole body) and urinary excretion measurements were highly correlated. Of the six patients treated at the highest dosage schedules (three at 1510 MBq/m2 and three at 1665 MBq/m2), three showed a posttherapy decline in prostate-specific antigen of 50% or more. The declines were not sustained. The determination of total activity retained at 24 h, as well as an estimate of marrow dose, correlated with the amount of myelosuppression observed. These results suggest that a single 24-h measurement of retained activity would allow individualized dosing and an improved therapeutic index relative to fixed dosing schema. Repetitive dosing is required to increase palliation. (+info)A new experimental determination of the dose calibrator setting for 188Re. (4/195)
Accurate activity measurements of radionuclides using commercial dose calibrators requires that the correct dial setting (or calibration factor) be applied. The dose calibrator setting for the medical radionuclide 188Re (as 188ReO4-) has been determined experimentally using solution sources prepared and calibrated at the National Institute of Standards and Technology (NIST). METHODS: The specific activity of two sources (in units of MBq/g) in the standard 5-mL NIST ampoule and in a 5-mL SoloPak dose vial were calibrated using 4pibeta liquid scintillation counting with 3H-standard efficiency tracing and gamma-ray/bremmstrahlung counting in the NIST "4pi" gamma ionization chamber on gravimetrically related sources. RESULTS: The newly determined settings for the NIST Capintec CRC-12 dose calibrator are (631+/-4) x 10 and (621+/-3) x 10 for the respective ampoule and dose vial geometries with an expanded (at a presumed 95% confidence level) uncertainty of 0.4%-0.5% in the activity determination. The setting for the dose vial geometry was independently confirmed using a Capintec CRC-15R at Cedars-Sinai Medical Center using sources calibrated against a NIST standard. CONCLUSION: These new settings result in activity readings 28%-30% lower than those obtained using the previously recommended setting of 496 x 10. This discrepancy most likely results from underestimating the total radiation yield from 188Re decay when calculating the dose calibrator response. This study emphasizes the need for experimental determinations of dose calibrator settings in the geometry in which the measurements will be performed. (+info)Effects of intracoronary radiation on thrombosis after balloon overstretch injury in the porcine model. (5/195)
BACKGROUND: The main complications of PTCA remain thrombosis and restenosis. Recent studies have demonstrated reduction in the neointimal hyperplasia after intracoronary radiation (IR) with doses of 10 to 25 Gy of ionizing radiation delivered by either beta- or gamma-emitters to injured vessels. The purpose of this study was to examine the effect of ionizing radiation on the thrombosis rate (TR) of injured porcine coronary arteries. METHODS AND RESULTS: Thirty-four juvenile swine (63 coronary arteries) were subjected to overstretch balloon injury followed by IR with doses of 0 to 18 Gy of either beta- or gamma-radiation. Two weeks after treatment, tissue sections were perfusion-fixed, stained with hematoxylin-eosin and Verhoeff-van Gieson's stain, and analyzed for presence of a thrombus, thrombus morphology, and neointima formation by computer-assisted histomorphometry techniques. Although the overall TR increased dose-dependently from 0 to 18 Gy prescribed dose, luminal thrombi decreased. Thrombus area also decreased with increasing radiation dose, whether assessed at the prescription point or at the luminal surface, which corresponded to decreased intimal area. Furthermore, luminal thrombi present after IR tended to consist mostly of fibrin and thus were less organized than in controls. CONCLUSIONS: These results suggest that IR induces thrombosis but does not necessarily compromise the lumen. Strategies for reducing TR may further decrease intimal area as well as increasing the safety of this therapy. (+info)Radioimmunotherapy for the intensification of conditioning before stem cell transplantation: differences in dosimetry and biokinetics of 188Re- and 99mTc-labeled anti-NCA-95 MAbs. (6/195)
A new concept is the intensification of preparative regimens for patients with advanced leukemia using monoclonal antibodies (MAbs) with an affinity for beta emitter-labeled bone marrow. 188Re is a high-energy beta emitter that has therapeutic promise. Our first aim was to clarify whether the therapeutic application of 188Re-MAb against nonspecific cross-reacting antigen 95 (NCA-95) can be predicted from biokinetic data derived from 99mTc-labeled NCA-95. Our second aim was to show that a radiation absorbed dose of > or =12 Gy in the bone marrow can be achieved using 188Re-MAb. METHODS: Dosimetric data were obtained for both radiotracers from multiple planar whole-body scans (double-head gamma camera), blood samples, and urine measurements from 12 patients with advanced leukemia. Radiation absorbed doses were calculated using MIRDOSE 3 software. RESULTS: Radiation absorbed doses to bone marrow, liver, spleen, lung, and kidney were 2.24, 0.50, 1.93, 0.05, and 0.90 mGy/MBq, respectively, using 99mTc-MAb and 1.45, 0.43, 1.32, 0.07, and 0.71 mGy/MBq, respectively, using 188Re-MAb. These differences were statistically significant for bone marrow, spleen, and kidney. The main differences were less accumulation of 188Re-MAb in bone marrow (31%+/-13% compared with 52%+/-13%) and faster elimination through urine (25%+/-3% compared with 15%+/-5% after 24 h). On the basis of these data, a mean marrow dose of 14+/-7 Gy was achieved in 12 patients suffering from leukemia after application of approximately 10+/-2 GBq 188Re-MAb. CONCLUSION: Myeloablative radiation absorbed doses can easily be achieved using 188Re-MAb. 99mTc- and 188Re-MAb showed similar whole-body distributions. However, direct prediction of radiation absorbed doses from the 99mTc-MAb, assuming identical biokinetic behavior, is not valid for the 188Re-MAb in a single patient. Therefore, individual dosimetry using 188Re-MAb is needed to calculate therapeutic activity. (+info)Noninvasive monitoring of gene transfer using a reporter receptor imaged with a high-affinity peptide radiolabeled with 99mTc or 188Re. (7/195)
Gene therapy protocols require better modalities to monitor the location and level of transferred gene expression. One potential in vivo mechanism to assess gene expression would be to image the binding of a radiolabeled peptide to a reporter receptor that is expressed in targeted tissues. This concept was tested in a tumor model using a replication-incompetent adenoviral vector encoding the human type 2 somatostatin receptor (Ad5-CMVhSSTr2). Expression of the hSSTr2 reporter was imaged using a radiolabeled, somatostatin-avid peptide (P829). METHODS: Bilateral subcutaneous A427 tumor xenografts were established on the flanks of athymic nude mice. These human-origin, non-small cell lung tumors are normally negative for hSSTr2 expression. One tumor was injected directly with Ad5-CMVhSSTr2, whereas the second tumor was injected directly with a control Ad5 vector. The mice were injected intravenously 48 h later with P829 peptide that was radiolabeled to high specific activity with 99mTc (half-life, 6 h) or 188Re (half-life, 17 h). Tumors were frozen and evaluated for somatostatin receptor expression using fluorescein-labeled somatostatin. RESULTS: The accumulation of radiolabeled P829 in hSSTr2-expressing tumors was easily visualized by gamma camera imaging 3 h after injection. Imaging region of interest analyses and biodistribution studies confirmed a 5- to 10-fold greater accumulation of both radiolabeled P829 peptides in the Ad5-CMVhSSTr2-injected tumors versus control tumors injected with control Ad5 vectors. Ad5-CMVhSSTr2-injected tumors accumulated 2.5-3.8 percentage injected dose per gram 3 h after injection. Only Ad5-CMVhSSTr2-injected tumors expressed somatostatin receptors, as determined by immunohistochemistry. CONCLUSION: These studies show the feasibility of imaging a 99mTc-labeled peptide's binding to a reporter receptor after in vivo gene transfer to tumor cells. The 188Re-labeled peptide worked equally well for this imaging approach and offers the additional advantage of energetic beta decay with potential therapeutic efficacy. 99mTc and 188Re are generator produced, an advantage for widespread availability and low cost, and both radioisotopes can be imaged with existing, high-resolution modalities. There is great potential for using 99mTc-labeled peptides for imaging gene transfer with the hSSTr2 reporter receptor, especially when the reporter correlates with the expression of therapeutic genes that can be included simultaneously in the gene therapy vector. (+info)Intracoronary beta-irradiation with a liquid (188)re-filled balloon: six-month results from a clinical safety and feasibility study. (8/195)
BACKGROUND: Coronary irradiation is a new concept to reduce restenosis. We evaluated the feasibility and safety of intracoronary irradiation with a balloon catheter filled with (188)Re, a liquid, high-energy beta-emitter. METHODS AND RESULTS: Irradiation with 15 Gy at 0.5-mm tissue depth was performed in 28 lesions after balloon dilation (n=9) or stenting (n=19). Lesions included 19 de novo stenoses, 4 occlusions, and 5 restenoses. Irradiation time was 515+/-199 seconds in 1 to 4 fractions. There were no procedural complications. One patient died of noncardiac causes at day 23. One asymptomatic patient refused 6-month angiography. Quantitative angiography after intervention showed a reference diameter of 2. 77+/-0.35 mm and a minimal lumen diameter of 2.36+/-0.43 mm. At 6-month follow-up, minimal lumen diameter was 1.45+/-0.88 mm (late loss index 0.57). Target lesion restenosis rate (>50% in diameter) was low (12%; 3 of 26). In addition, we observed 9 stenoses at the proximal or distal end of the irradiation zone, potentially caused by the short irradiation segment and the decreasing irradiation dose at its borders ("edge" stenoses). The total restenosis rate was 46% and was significantly lower (29% vs 70%, P=0.042) when the length of the irradiated segment was more than twice the lesion length. CONCLUSIONS: Coronary irradiation with a (188)Re-filled balloon is technically feasible and safe, requiring only standard percutaneous transluminal coronary angioplasty techniques. The target lesion restenosis rate was low. The observed edge stenoses appear to be avoidable by increasing the length of the irradiated segment. (+info)Rhenium is a chemical element with symbol Re and atomic number 75, which is a heavy, silvery-white, metallic transition element that is highly resistant to corrosion and heat, and is primarily used in high-temperature environments such as jet engines and nuclear reactors. However, it's important to note that Rhenium does not have a direct medical application or definition, but it may be used in some medical devices or instruments due to its unique properties.
I'm sorry for any confusion, but "Rhenium" is not a medical term. It is a chemical element with the symbol "Re" and atomic number 75. Rhenium is a heavy, silvery-white, metallic element that is highly resistant to corrosion and is used in high-temperature alloys and electronics.
It does not have any direct medical relevance or application as a drug, treatment, or diagnostic tool in human medicine. However, like many other elements, rhenium compounds are being studied for their potential medicinal uses, such as in cancer therapy. But it's important to note that these are still in the research phase and have not yet been approved for use in humans.
Radioisotopes are isotopes of elements that undergo radioactive decay, releasing energy in the form of radiation and often used in medical imaging, treatment, and research.
Radioisotopes, also known as radioactive isotopes or radionuclides, are variants of chemical elements that have unstable nuclei and emit radiation in the form of alpha particles, beta particles, gamma rays, or conversion electrons. These isotopes are formed when an element's nucleus undergoes natural or artificial radioactive decay.
Radioisotopes can be produced through various processes, including nuclear fission, nuclear fusion, and particle bombardment in a cyclotron or other types of particle accelerators. They have a wide range of applications in medicine, industry, agriculture, research, and energy production. In the medical field, radioisotopes are used for diagnostic imaging, radiation therapy, and in the labeling of molecules for research purposes.
It is important to note that handling and using radioisotopes requires proper training, safety measures, and regulatory compliance due to their ionizing radiation properties, which can pose potential health risks if not handled correctly.
Alpha-MSH (melanocyte-stimulating hormone alpha) is a neuropeptide hormone, derived from the precursor protein proopiomelanocortin, that plays roles in various physiological processes including skin pigmentation, energy homeostasis, and sexual behavior.
Alpha-MSH (α-MSH) stands for alpha-melanocyte stimulating hormone. It is a peptide hormone that is produced in the pituitary gland and other tissues in the body. Alpha-MSH plays a role in various physiological processes, including:
1. Melanin production: Alpha-MSH stimulates melanin production in the skin, which leads to skin tanning.
2. Appetite regulation: Alpha-MSH acts as a appetite suppressant by signaling to the brain that the stomach is full.
3. Inflammation and immune response: Alpha-MSH has anti-inflammatory effects and helps regulate the immune response.
4. Energy balance and metabolism: Alpha-MSH helps regulate energy balance and metabolism by signaling to the brain to increase or decrease food intake and energy expenditure.
Alpha-MSH exerts its effects by binding to melanocortin receptors, specifically MC1R, MC3R, MC4R, and MC5R. Dysregulation of alpha-MSH signaling has been implicated in various medical conditions, including obesity, anorexia nervosa, and certain skin disorders.
Organometallic compounds are defined as chemical entities containing at least one direct bond between a metal atom and a carbon atom from an organic fragment, playing a significant role in catalysis, medicinal chemistry, and materials science.
Organometallic compounds are a type of chemical compound that contain at least one metal-carbon bond. This means that the metal is directly attached to carbon atom(s) from an organic molecule. These compounds can be synthesized through various methods, and they have found widespread use in industrial and medicinal applications, including catalysis, polymerization, and pharmaceuticals.
It's worth noting that while organometallic compounds contain metal-carbon bonds, not all compounds with metal-carbon bonds are considered organometallic. For example, in classical inorganic chemistry, simple salts of metal carbonyls (M(CO)n) are not typically classified as organometallic, but rather as metal carbonyl complexes. The distinction between these classes of compounds can sometimes be subtle and is a matter of ongoing debate among chemists.
Radiopharmaceuticals are defined as pharmaceutical formulations that contain radioisotopes and are used diagnostically or therapeutically for medical imaging or treatment of various diseases.
Radiopharmaceuticals are defined as pharmaceutical preparations that contain radioactive isotopes and are used for diagnosis or therapy in nuclear medicine. These compounds are designed to interact specifically with certain biological targets, such as cells, tissues, or organs, and emit radiation that can be detected and measured to provide diagnostic information or used to destroy abnormal cells or tissue in therapeutic applications.
The radioactive isotopes used in radiopharmaceuticals have carefully controlled half-lives, which determine how long they remain radioactive and how long the pharmaceutical preparation remains effective. The choice of radioisotope depends on the intended use of the radiopharmaceutical, as well as factors such as its energy, range of emission, and chemical properties.
Radiopharmaceuticals are used in a wide range of medical applications, including imaging, cancer therapy, and treatment of other diseases and conditions. Examples of radiopharmaceuticals include technetium-99m for imaging the heart, lungs, and bones; iodine-131 for treating thyroid cancer; and samarium-153 for palliative treatment of bone metastases.
The use of radiopharmaceuticals requires specialized training and expertise in nuclear medicine, as well as strict adherence to safety protocols to minimize radiation exposure to patients and healthcare workers.
Rhenium - Wikipedia
Some ores contain 0.001% to 0.2% rhenium. Roasting the ore volatilizes rhenium oxides. Rhenium(VII) oxide and perrhenic acid ... Wikimedia Commons has media related to Rhenium. Look up rhenium in Wiktionary, the free dictionary. Rhenium at The Periodic ... could be hazardous due to elements other than rhenium or due to rhenium itself. Only a few compounds of rhenium have been ... Rhenium in the form of rhenium-platinum alloy is used as catalyst for catalytic reforming, which is a chemical process to ...
Rhenium - New World Encyclopedia
Ammonium perrhenate (APR, NH4ReO4): This salt of rhenium is the most common form in which rhenium is traded. Its rhenium ... Rhenium trioxide or rhenium (VI) oxide (ReO3): This oxide is a red solid with a metallic luster. It is the only stable trioxide ... Rhenium wire is used in photoflash lamps in photography.. Precautions. Little is known about the toxicity of rhenium, but as a ... Rhenium-molybdenum alloys are superconductive at ten Kelvin (K), and tungsten-rhenium alloys are superconductive around four to ...
Persistent Lines of Singly Ionized Rhenium ( Re II )
E696 Standard Specification for Tungsten-Rhenium Alloy Thermocouple Wire
... tungsten and rhenium alloy thermoelements having diameters of 0.13 mm (0.005 in.) to 0.5 mm (0.020 in.) supplied in matched ... rhenium (W3RE/W25RE) and tungsten-5% rhenium versus tungsten-26% rhenium (W5RE/W26RE). All information applies to both ... Standard Specification for Tungsten-Rhenium Alloy Thermocouple Wire. Standard Specification for Tungsten-Rhenium Alloy ... 1.1 This specification covers the requirements for bare, solid conductor, tungsten and rhenium alloy thermoelements having ...
Pebble copper/gold/molybdenum/silver/rhenium project, US - update
Pebble copper/gold/molybdenum/silver/rhenium project.. Location. South-west Alaska, in the US.. Project Owner/s. Pebble Limited ... 1.8-million ounces a year of silver and 12 000 kg/y of rhenium.. The three expansion scenarios are modelled on a concept ... 37-million ounces of silver and 230 000 kg of rhenium.. Average metal production is forecast at 320-million pounds a year of ...
Sample of the element Rhenium in the Periodic Table
Sample of the element Rhenium in the Periodic Table
Isotope data for rhenium-172 in the Periodic Table
Detailed decay information for the isotope rhenium-172 including decay chains and daughter products. ... Rhenium Pictures Page. Al. Si. P. S. Cl. Ar. K. Ca. Rhenium Technical Data. Sc. Ti. V. Cr. Mn. Fe. Co. Ni. Cu. Zn. Ga. Ge. As. ... Isotopes of Rhenium (click to see decay chain):. 160Re 161Re 162Re 163Re 164Re 165Re 166Re 167Re 168Re 169Re 170Re 171Re 172Re ... Rhenium Main Page. Black White Gray. B. C. N. O. F. Ne. ...
Tungsten/Rhenium Alloy Wire 0.075mm dia annealed
Facts, pictures, stories about the element Rhenium in the Periodic Table
Rhenium at The Wooden Periodic Table Table by Theodore Gray ... Rhenium foil.. These are tiny little strips of rhenium foil ... Tungsten-rhenium alloy x-ray tube.. The conical disk in this sample is a heavy slab of tungsten-rhenium alloy. The structure ... Rheniite, a rare rhenium mineral. Source: Jensan Scientifics. Contributor: Theodore Gray. Acquired: 25 April, 2009. Text ... Rhenium in Wolframite.. This is basically a fine powder which is said to have been determined by neutron activation analysis to ...
Rhenium Oxide Re2O7 - ESPI Metals
No toxic effects are known for rhenium metal. Rhenium compounds may be irritating to the eyes and respiratory tract. ... Other Precautions: Rhenium oxide decomposes in water. Handle and store in a controlled atmosphere and under an inert gas such ... To the best of our knowledge the chemical, physical and toxicological properties of rhenium oxide have not been thoroughly ... Rhenium oxide is an oxidizer; contact with combustible material may cause fire. ...
Sales & Application Specialist - Bioproduction - Rhenium
Testing of Wrought Iridium/Chemical Vapor Deposition Rhenium Rocket - NASA Technical Reports Server (NTRS)
... liner and a rhenium substrate deposited via chemical vapor deposition, was tested over an extended period on gaseous oxygen/ ... iridium/rhenium (Ir/Re) rocket chamber, composed of a thick (418 miocrometer) wrought iridium (Ir) ... Testing of Wrought Iridium/Chemical Vapor Deposition Rhenium Rocket. 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 ...
X-Ray fluorescence microscopy reveals that rhenium(i) tricarbonyl isonitrile complexes remain intact in vitro - Chemical...
Diego Morrill - Rhenium (Extended Mix) | Free Listening on Mixupload
MiRus® Announces Launch of Molybdenum-Rhenium Low Profile ATLAS™ MoRe® Foot and Ankle Plating System
With the MoRe Rhenium-based superalloy, they are bringing products that are superior to current alloys being used in foot and ... The molybdenum-rhenium alloy used in the plates allows for a dramatically smaller footprint of 1.0mm thickness without ... Inspired by the pioneering material science of NASA for rocket engines, MiRus has created Rhenium based medical alloys that are ... MoRe®, a proprietary molybdenum rhenium superalloy for medical implants, provides an unprecedented combination of strength, ...
MiRus® Announces Launch of Molybdenum-Rhenium Low Profile ATLAS™ MoRe® Foot and Ankle Plating System
With the MoRe Rhenium-based superalloy, they are bringing products that are superior to current alloys being used in foot and ... The molybdenum-rhenium alloy used in the plates allows for a dramatically smaller footprint of 1.0mm thickness without ... Inspired by the pioneering material science of NASA for rocket engines, MiRus has created Rhenium based medical alloys that are ... MoRe®, a proprietary molybdenum rhenium superalloy for medical implants, provides an unprecedented combination of strength, ...
Synthesis and luminescence behaviour of novel heterodecanuclear silver(i)-rhenium(i) alkynyl complexes. X-Ray crystal...
RHENIUM - Phytob
The Institute of Phytobiophysics® was established in 1990 and was affiliated to the Open International University of Complementary medicine in 1992. The Institute offers comprehensive formal Post graduate training to practitioners of all medical modalities. The Institute syllabus was accredited by the Guild of Professional Practitioners in 1997 and was affiliated to The Complementary Medical Association in 1999. The Institute offers a two year post graduate Diploma course. ...
China Rhenium Co. sell Rhenium products Marketplace View Asian Metal
Low dose of a rhenium metal complex interferes with cellular metabolism to kill ovarian cancer cells
In the journal Angewandte Chemie, a research team has now described how a very low dose of a rhenium metal complex interferes ... In the journal Angewandte Chemie, a research team has now described how a very low dose of a rhenium metal complex interferes ... Low dose of a rhenium metal complex interferes with cellular metabolism to kill ovarian cancer cells. ... Low dose of a rhenium metal complex interferes with cellular metabolism to kill ovarian cancer cells. by Wiley ...
Rhenium Hexafluoride
Rhenium - Minerals Education Coalition
Rhenium is found as a trace element in platinum ores and in the mineral ... Rhenium (element #75, symbol Re) is a rare, silvery-white metallic element. ... Rhenium. Rhenium (element #75, symbol Re) is a rare, silvery-white metallic element. Rhenium is found as a trace element in ... Rhenium (element #75, symbol Re) is a rare, silvery-white metallic element. Rhenium is found as a trace element in platinum ...
Tungsten Alloy Blank Supplier | Tungsten Alloy Blanks with Rhenium | Eagle Alloys Corporation
RADII FOR RHENIUM 166 (Z=75, N=91)
Mechanistic Insights into the Rhenium-Catalyzed Alcohol-To-Olefin Dehydration Reaction
Rhenium-based complexes are powerful catalysts for the dehydration of various alcohols to the corresponding olefins. Here, we ... Mechanistic Insights into the Rhenium-Catalyzed Alcohol-To-Olefin Dehydration Reaction. DSpace/Manakin Repository. ... report on both experimental and theoretical (DFT) studies into the mechanism of the rhenium-catalyzed dehydration of alcohols ...
Rhenium Fact Archives | Refractory Metals and Alloys
... rhenium, Rhenium Fact, Rhenium Facts, rhenium metal, The Discovery of Rhenium, The Extraction Process of Rhenium, The ... Tags: 6 Facts About Rhenium, 6 Interesting Facts About Rhenium, Advanced Refractory Metals, ARM, Fact About Rhenium, Facts ... Properties of Rhenium, The Recycling of Rhenium, The Reserves and Production of Rhenium, The Uses of Rhenium, Transition Metal ... 6 Interesting Facts about Rhenium Rhenium is a rare silver-white metal and belongs to the 6th-period transition metal in the ...
W6824 Tungsten/Rhenium Wire - Advent Research Materials
Experimental Determination of Dose Calibrator Settings and Study of Associated Volume Dependence in V-Vials for Rhenium-186...
Rhenium-186 was produced through the 185Re(n,γ)186Re reaction at the Missouri University Research Reactor (MURR), Columbia, MO ... Rhenium-186 is being investigated for a wide variety of applications in nuclear medicine. At the present time, there is no ... The activated rhenium metal powder is dissolved and oxidized in excess 30% (w/v) hydrogen peroxide in water and gently heated ... Uncertainty Components Evaluated in the Determination of the Massic Activity CA (in units of MBq · g−1) for Rhenium-186 ...
AlloysMolybdenum-rheniumAlloyPowderDemand for rheniumPeriodic tableIridiumSilvery-white metalWireCatalystsMetalsComplexesMelting temperatureOresFoilCarbonylOsmiumSuperalloysCrusherByproductTelluriumThermocouplesMetal37.4RhenusCompoundsMolybdeniteAtomic2020CopperCarbonSpecificationComponentsWidelyProductsFormulaMineralSymbolStableCrystalChemicalElementSolidEngineDirect
Alloys20
- These alloys contain up to 6% rhenium, making jet engine construction the largest single use for the element. (wikipedia.org)
- It was estimated in 1968 that 75% of the rhenium metal in the United States was used for research and the development of refractory metal alloys. (wikipedia.org)
- tungsten-rhenium alloys are also superconductive around 4-8 K, depending on the alloy. (wikipedia.org)
- Recycling of used platinum-rhenium catalyst and special alloys allow the recovery of another ten tons/year. (newworldencyclopedia.org)
- The process was so complicated and the cost so high that production was discontinued until early 1950, when tungsten-rhenium and molybdenum-rhenium alloys were prepared. (newworldencyclopedia.org)
- These alloys found important applications in industry, resulting in a high demand for rhenium produced from the molybdenite fraction of porphyry copper ores. (newworldencyclopedia.org)
- Rhenium-molybdenum alloys are superconductive at ten Kelvin (K), and tungsten-rhenium alloys are superconductive around four to eight K, depending on the alloy. (newworldencyclopedia.org)
- All tests and processes described herein must be performed under suitably inert conditions that are nonreactive to tungsten-rhenium alloys. (astm.org)
- For high-temperature thermocouples we supply Platinum, Platinum/Rhodium alloys, Tungsten and Tungsten/Rhenium alloys. (goodfellow.com)
- With the MoRe Rhenium-based superalloy, they are bringing products that are superior to current alloys being used in foot and ankle from titanium to cobalt chromium. (ktsm.com)
- Inspired by the pioneering material science of NASA for rocket engines, MiRus has created Rhenium based medical alloys that are transforming medicine by making surgeries less invasive and implants safer and more durable. (ktsm.com)
- Because of its very high melting point, rhenium is used to make high-temperature alloys (an alloy is a mixture of metals) that are used in jet engine parts. (mineralseducationcoalition.org)
- Rhenium alloys are used to make a variety of equipment and equipment parts, such as temperature controls, heating elements, mass spectrographs, electrical contacts, electromagnets, and semiconductors. (mineralseducationcoalition.org)
- Rhenium Alloys offers Copper-Tungsten in sheet and foil. (globalspec.com)
- For over 45 years, Rhenium Alloys has been delivering high performance refractory metals to customers who desire an alloy that can withstand. (globalspec.com)
- Tungsten-Rhenium Alloys provides a wide range of Wire products to serve applications in major electronics products, thermocouples, high temperature furnace parts, and welding requirements. (globalspec.com)
- Tungsten-Rhenium alloys serve a wide range of applications in electronics, furnace, joining, and aerospace industries. (globalspec.com)
- Rhenium can improve the creep strength of nickel super-alloys, which can be used to make jet engine combustion chambers, turbine blades and exhaust nozzles. (huaweimaterial.com)
- rhenium raymond roller mill Appliions of Molybdenum Metal and Its Alloys International Hot rolling molybdenum creates spectacular heat and smoke. (grupagastronomiaslask.pl)
- Other rhenium alloys_Rheniumet Ltd. (rheniumet.com)
Molybdenum-rhenium3
- The molybdenum-rhenium alloy used in the plates allows for a dramatically smaller footprint of 1.0mm thickness without sacrificing performance. (ktsm.com)
- The MiRus Atlas plating system brings us the lowest profile plates as well as the highest contourability, thanks to the MoRe alloy (Molybdenum-Rhenium alloy). (ktsm.com)
- Very small amounts are gathered by recycling molybdenum-rhenium and tungsten-rhenium scrap metals. (mineralseducationcoalition.org)
Alloy3
- 1.1 This specification covers the requirements for bare, solid conductor, tungsten and rhenium alloy thermoelements having diameters of 0.13 mm (0.005 in. (astm.org)
- An alloy of rhenium and molybdenum is a superconductor of electricity at very low temperatures. (mineralseducationcoalition.org)
- Rhenium-nickel alloy is the core material of modern jet engine blades, turbine disks and other important structural parts. (huaweimaterial.com)
Powder5
- The usual commercial form of rhenium is a powder, but it can be consolidated by pressing and resistance-sintering in a vacuum or hydrogen atmosphere. (newworldencyclopedia.org)
- This is a compressed and sintered button of rhenium powder. (theodoregray.com)
- This is basically a fine powder which is said to have been determined by neutron activation analysis to be microscopic inclusions of rhenium in wolframite grains. (theodoregray.com)
- This shows what happens when you blast some compressed rhenium powder (left) with a high-current electric arc in an arc melting furnace (under an inert argon atmosphere): You get a nice shiny button of solid rhenium (right). (theodoregray.com)
- Rhenium disulfide powder can be used to make ReS2 nanosheets and nanoparticles down to single-layer films via liquid chemical exfoliation. (businessresearchinsights.com)
Demand for rhenium1
- Due to increases in recycling and a drop in demand for rhenium in catalysts, the price had dropped to US$2,844 per kilogram (US$1,290 per pound) as of July 2018. (wikipedia.org)
Periodic table1
- 6 Interesting Facts about Rhenium Rhenium is a rare silver-white metal and belongs to the 6th-period transition metal in the periodic table. (refractorymetal.org)
Iridium3
- Rhenium is also one of the densest, exceeded only by the densities of platinum , iridium , and osmium . (newworldencyclopedia.org)
- 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. (nasa.gov)
- Chlorination kinetics of rhenium, rhodium and iridium. (cdc.gov)
Silvery-white metal1
- Rhenium is a silvery-white metal with one of the highest melting points of all elements, exceeded by only tungsten and carbon. (wikipedia.org)
Wire2
- The flashbulbs in the cubes that were used on some Kodak Instamatics were not triggered electrically (with rhenium wire), but with a percussive pyrotechnic mix inside a little metallic tube that stuck out of the bulb. (theodoregray.com)
- Our Rhenium Wire is 99.99% pure. (globalspec.com)
Catalysts2
- In this application, rhenium compounds act as catalysts. (mineralseducationcoalition.org)
- Rhenium-based complexes are powerful catalysts for the dehydration of various alcohols to the corresponding olefins. (uu.nl)
Metals2
- Rhenium is a member of the noble metals sub-group, but unlike the other members it doesn't seem to be used in jewelry, though it probably could be. (theodoregray.com)
- Precise alloying of Rhenium with these other refractory metals adds both ductility and strength to. (globalspec.com)
Complexes1
- Synthesis and luminescence behaviour of novel heterodecanuclear silver(i)-rhenium(i) alkynyl complexes. (rsc.org)
Melting temperature1
- It is very dense and has a melting temperature of 3186 degrees C (5767 degrees F). Rhenium does not form minerals of its own, but does occur as a trace element in the minerals columbite, tantalite and molybdenite. (mineralseducationcoalition.org)
Ores4
- The beta decay of 187Re is used for rhenium-osmium dating of ores. (wikipedia.org)
- Some molybdenum ores contain 0.002 percent to 0.2 percent rhenium. (newworldencyclopedia.org)
- Commercial rhenium is extracted from molybdenum roaster-flue dusts obtained from copper sulfide ores. (newworldencyclopedia.org)
- Rhenium is found as a trace element in platinum ores and in the mineral columbite. (mineralseducationcoalition.org)
Foil2
- Rhenium foil. (theodoregray.com)
- These are tiny little strips of rhenium foil about half an inch long. (theodoregray.com)
Carbonyl1
- Recently, a new potential antitumor drug was found in TRIP, a special rhenium carbonyl complex. (phys.org)
Osmium1
- In addition, rhenium is situated in period six, between tungsten and osmium . (newworldencyclopedia.org)
Superalloys2
- Nickel-based superalloys of rhenium are used in combustion chambers, turbine blades, and exhaust nozzles of jet engines. (wikipedia.org)
- These superalloys account for the majority of the rhenium use each year. (mineralseducationcoalition.org)
Crusher3
- portable rhenium kuwait [randpic] Mobile Mining Crusher Machine Kuwait Mobile Mining Crusher Machine Kuwait. (garagemoons.be)
- Mobile crusher machine in kuwait grinding mill china mobile crusher machine in kuwaitprice for sale find the right and the top portable rhenium mobile crusher in. (garagemoons.be)
- crushing sale rhenium crusher mill. (grupagastronomiaslask.pl)
Byproduct1
- Rhenium is a byproduct of copper mining and has one of the highest melting points, exceeded only by tungsten and carbon. (todini.com)
Tellurium1
- Rhenium has one stable isotope, rhenium-185, which nevertheless occurs in minority abundance, a situation found only in two other elements (indium and tellurium). (wikipedia.org)
Thermocouples3
- 5% ∣ t ∣ 0 ~ 2300 ℃ 1% tolerance ∣ t ∣ room temperature insulation resistance: tungsten-rhenium thermocouples in the ambient air temperature is 20 and 15 ℃, relative humidity is not more than 85%, the thermal insulation resistance between the electrode and the external protecting tube should be greater than 100 m Ω. (rtdcn.com)
- m。 Introduction of tungsten-rhenium thermocouples 1, tungsten-rhenium thermocouples tungsten-rhenium 5 - Tungsten rhenium 26 and tungsten rhenium 3 - Tungsten-rhenium two tungsten rhenium 5-25 Tungsten-rhenium 26, it is the name of the anode components in containing 5% 95%, rhenium, tungsten cathode nominal composition of containing 74%, 26% rhenium tungsten. (rtdcn.com)
- Tungsten-rhenium thermocouples are easily oxidized, suitable for use in dry inert or hydrogen, or with dense protection tube separate it with oxygen. (rtdcn.com)
Metal9
- Rhenium metal superconducts at 1.697±0.006 K. In bulk form and at room temperature and atmospheric pressure, the element resists alkalis, sulfuric acid, hydrochloric acid, nitric acid, and aqua regia. (wikipedia.org)
- Rhenium (chemical symbol Re , atomic number 75) is a silvery-white, lustrous, rare metal . (newworldencyclopedia.org)
- Rhenium is classified as a transition metal . (newworldencyclopedia.org)
- Life-of-mine (LoM) metal production for this scenario is estimated at 6.4-billion pounds of copper, 7.3-million ounces of gold, 300-million pounds of molybdenum, 37-million ounces of silver and 230 000 kg of rhenium. (miningweekly.com)
- Average metal production is forecast at 320-million pounds a year of copper, 363 000 oz/y of gold, 15-million pounds a year of molybdenum, 1.8-million ounces a year of silver and 12 000 kg/y of rhenium. (miningweekly.com)
- No toxic effects are known for rhenium metal. (espimetals.com)
- In the journal Angewandte Chemie , a research team has now described how a very low dose of a rhenium metal complex interferes with cellular metabolism to such an extent that it kills ovarian cancer cells. (phys.org)
- Rhenium disulfide is a high-purity, low-cost metal. (businessresearchinsights.com)
- Rhenium is a transition metal which appears silvery-gray. (todini.com)
37.41
- Naturally occurring rhenium is only 37.4% 185Re, and 62.6% 187Re, which is unstable but has a very long half-life (≈1010 years). (wikipedia.org)
Rhenus2
- Rhenium (Latin: Rhenus meaning: "Rhine") was the last-discovered of the elements that have a stable isotope (other new elements discovered in nature since then, such as francium, are radioactive). (wikipedia.org)
- The name rhenium is derived from the Latin word Rhenus , meaning " Rhine . (newworldencyclopedia.org)
Compounds1
- Rhenium compounds may be irritating to the eyes and respiratory tract. (espimetals.com)
Molybdenite1
- They also found rhenium in gadolinite and molybdenite. (wikipedia.org)
Atomic2
- Rhenium is a chemical element with the symbol Re and atomic number 75. (wikipedia.org)
- Rhenium, with the atomic symbol Re, has the atomic number 75. (teachersprintables.net)
20202
- The global rhenium disulfide market size was USD 380.9 million in 2020 and is projected to touch USD 2182.95 million by 2031, exhibiting a CAGR of 17.2% during the forecast period. (businessresearchinsights.com)
- On March 13, 2020 - shortly before the school closes due to the corona pandemic - pupils from the Rhenium International School visited a local farm. (rhenium.ng)
Copper1
- Rhenium is obtained almost exclusively as a by-product of the processing of a special type of copper deposit known as a porphyry copper deposit. (mineralseducationcoalition.org)
Carbon2
- The melting point of rhenium is among the highest of all elements, exceeded only by the melting points of tungsten and carbon . (newworldencyclopedia.org)
- Cannot be used for carbon atmosphere ( As used in the atmosphere containing hydrocarbons, a temperature over 1000 ℃ or corrosion) 。 Tungsten or tungsten rhenium easy to generate stable carbides in carbon atmosphere, so that to reduce its sensitivity and cause the brittle fracture, the presence of hydrogen, will accelerate carbonization. (rtdcn.com)
Specification1
- 1.2 This specification covers the thermocouple combinations of tungsten-3% rhenium versus tungsten-25% rhenium (W3RE/W25RE) and tungsten-5% rhenium versus tungsten-26% rhenium (W5RE/W26RE). (astm.org)
Components1
- Index number of WRe5 - WRe26, dividing number: W - Re5/26。 Tungsten-rhenium 3 - Tungsten-rhenium 25, it the name of the anode components in containing 3% 97%, rhenium, tungsten cathode nominal composition of containing 75%, 25% rhenium tungsten. (rtdcn.com)
Widely1
- Rhenium is widely spread in the Earth 's crust , at approximately 0.001 parts per million (ppm), but it is not found free in nature . (newworldencyclopedia.org)
Products1
- The optoelectronics products segment is expected to be the leader because the aerospace industry's need for rhenium was predicted to continue to rise, although being more unpredictable. (businessresearchinsights.com)
Formula1
- Rhenium disulfide (ReS2) is an inorganic rhenium-sulfur compound with the formula ReS2. (businessresearchinsights.com)
Mineral2
- It was only recently that the first rhenium mineral was found. (newworldencyclopedia.org)
- In 1994, Nature published a letter describing a rhenium sulfide mineral found condensing from a fumarole on Russia's Kudriavy volcano. (newworldencyclopedia.org)
Symbol1
- Rhenium (element #75, symbol Re) is a rare, silvery-white metallic element. (mineralseducationcoalition.org)
Stable1
- Discovered by Walter Noddack, Ida Tacke and Otto Berg in 1925, rhenium was the last stable element to be discovered. (wikipedia.org)
Crystal1
- Rhenium has a hexagonal close-packed crystal structure, with lattice parameters a = 276.1 pm and c = 445.6 pm. (wikipedia.org)
Chemical1
- To the best of our knowledge the chemical, physical and toxicological properties of rhenium oxide have not been thoroughly investigated and recorded. (espimetals.com)
Element1
- However, recent analysis indicated the presence of rhenium (element 75), not element 43, although this reinterpretation has been questioned by Eric Scerri. (wikipedia.org)
Solid1
- This absolutely stunning precision-machined bar of solid rhenium is worth a pretty serious amount of money, though Max got a great deal on it on eBay. (theodoregray.com)
Engine1
- The processing of scrapped engine parts to make engine revert grew globally, and the increased supply of engine revert was projected to have a substantial impact on the rhenium market. (businessresearchinsights.com)
Direct2
- Because of its limited interlayer coupling, rhenium disulfide is a direct band gap semiconductor with excellent optoelectronic performance. (businessresearchinsights.com)
- The physical features of rhenium disulfide are unusual: it has strong in-plane anisotropy and a direct tunable optical band gap between 1.4 and 1.6 eV for both bulk and monolayer structures. (businessresearchinsights.com)