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Thermal Imager Fundamentals
Published in James Stewart Campbell, M. Nathaniel Mead, Human Medical Thermography, 2023
James Stewart Campbell, M. Nathaniel Mead
Figure 3.1 shows a single leaflet microbolometer “pixel” of vanadium oxide (V2O5) suspended on cantilevered legs above a silicon chip. V2O5 is chosen for the sensor because of its large resistance change with temperature, approximately 2%–3% per degree Kelvin around room temperature.7 Minor differences in the multistage photolithographically-controlled micromachining of the pixel leaflets make each one unique, with its own thermal offset and gain that must be determined by blackbody calibration and then corrected digitally.
Versatile Nature of Poly(Vinylpyrrolidone) in Clinical Medicine
Published in P. Mereena Luke, K. R. Dhanya, Didier Rouxel, Nandakumar Kalarikkal, Sabu Thomas, Advanced Studies in Experimental and Clinical Medicine, 2021
K. R. Dhanya, P. Mereena Luke, Sabu Thomas, Didier Rouxel, Nandakumar Kalarikkal
Vanadium oxide-PVP composites are generally used in lithium-ion batteries. These products show high mechanical strength, dimensional stability, and high electrical conductivity. Solar cells and dye-sensitized cells based PVP materials have found remarkable properties. In Nickel-Cd and NiH batteries), the function of PVP is as a coating agent, binder, and an adhesive. Thus, the use of PVP in energy storage devices has considerably higher effect comparing to other applications.
Inhalation Toxicity of Metal Particles and Vapors
Published in Jacob Loke, Pathophysiology and Treatment of Inhalation Injuries, 2020
Vanadium is used extensively in the steel industry to increase hardness, malleability, and resistance to fatigue. Vanadium oxide is used as a catalyst in sulfuric and nitric acid manufacture. Vanadium compounds are also used as mordants in dyeing and printing cotton and for fixing aniline black on silk. Ammonium metavanadate, NH4 VO3, may be present in quick-drying inks.
HSP60 in cancer: a promising biomarker for diagnosis and a potentially useful target for treatment
Published in Journal of Drug Targeting, 2022
Bo Sun, Ganghui Li, Qing Yu, Dongchun Liu, Xing Tang
As a newer tumour therapeutic method, photothermal therapy has the advantages of high selectivity and low side effects, but the shallow depth of near-infrared (NIR) irradiation limits its utility in tumour treatment [74]. Therefore, one research team developed a vanadium oxide nanocomposite (VO2-ICG) loaded with indocyanine green, a type of nanomedicine activated by pH to enhance photothermal tumour ablation [74]. In the acidic tumour microenvironment, the complex decomposes to release VO2+. VO2+ can not only inhibit the function of HSP60 and reduce the heat resistance of cells, but also catalyse production of hydroxyl free radicals from H2O2 in tumour and enhance oxidative stress in tumour cells. This ultimately improves the efficiency of photothermal therapy [74]. This work highlights the importance of HSP60 inhibition and %OH production in promoting apoptosis under mild hyperthermia.
Vanadium pentoxide increased PTEN and decreased SHP1 expression in NK-92MI cells, affecting PI3K-AKT-mTOR and Ras-MAPK pathways
Published in Journal of Immunotoxicology, 2018
Francisco Gallardo-Vera, Miguel Tapia-Rodriguez, Daniel Diaz, Teresa Fortoul van der Goes, Luis F. Montaño, Erika P. Rendón-Huerta
The aim of the study here was to determine potential effects of V2O5 (as vanadium oxide model) on other IL-2 receptor-mediated signaling pathways, specifically PI3K-Akt-mTOR and rat sarcoma (Ras)-MAPK in NK cells. Using an IL-2-independent human NK-92MI cell line phenotypically considered an NKbright cell, the studies showed that V2O5 modified both pathways, in part, via enhancement of phosphatase and tensin homolog (PTEN) and decreases in Src homology region 2 domain-containing phosphatase-1 (SHP1) expression in these cells.
DNA binding, BSA interaction and in-vitro antimicrobial studies of Cu(II), Co(III), Ni(II) and VO(IV) complexes with a new Schiff base
Published in Egyptian Journal of Basic and Applied Sciences, 2020
Disha Sharma, Hosakere D. Revanasiddappa, Basavegowda Jayalakshmi
The representive TG curve of copper-complexes shows that, the thermal decomposition took place in two steps in the region 127–209°C and 336–556°C corresponding to the mass of loss of coordinated water and chloride ion with the percentage mass loss of 9.87% (calcd. 9.55%),loss of ligand moieties with the percentage mass loss of 85.79% (calcd. 85.47%) and 1, 10-phenanthroline moiety were decomposed at 635–693°C with the mass loss of 25.66% (calcd. 25.42%) respectively. In the cobalt – complexes, the first weight loss of 7.65% (calcd. 7.39%) in the 139–227°C range represents the dissociation and coordinated water as well as chlorine. The second and third steps correspond to the complete loss of the ligand molecule in the temperature range between 328–487 and 491–532°C with a mass loss of 28.74% (calcd.28.48%) and 19.32% (calcd.19.05%), respectively. Finally the most stable CoO is formed. Thermal analysis of nickel-complexes can be divided into three stages. In the first stage, weight loss is in the range 139–187°C having mass loss of 14.09% (calcd.13.95%) due to loss of coordinated water and chloride ion. In continuation to the first stage, gradual weight loss in the range 255–379°C having mass loss of 36.36% (calcd. 36.14%) shows partial decomposition of the ligand moiety around the metal ion. The degradation stage is in the range of 416 − 502°C with an estimated mass loss of 41.01% (calcd. 40.79%), which is corresponding to the NiO as a final residue. And, one 1, 10-phenanthroline moiety were decomposed at 565–681°C, with mass losses of 30.88% (calcd. 30.61%) and 29.42% (calcd. 29.26%) leaving behind the corresponding metal oxide respectively. The oxidovanadium- complexes decomposes in two stages. The first stage degradation starts at 164–255°C with an estimated weight loss of 33.84% (calcd.33.67%) due to loss of phenanthroline. Further decomposition occurs in the temperature range of 273–420°C having mass loss of 45.23% (calcd. 45.02%) reflects the association of coordinated ligand. Further decomposition occurs in the temperature range of 531–663°C corresponds to the final residue estimated as free vanadium oxide.