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1.
Sci Rep ; 13(1): 19407, 2023 11 08.
Artigo em Inglês | MEDLINE | ID: mdl-37938240

RESUMO

Osteoporosis (OP) and osteoarthritis (OA) are skeletal disorders characterized by a reduction in bone density and quality, resulting in increased fragility and susceptibility to fractures. These illnesses are exhibiting a higher prevalence among both males and females. Fracture risk is determined by using the BMD score (Bone Mineral Density). Looking at the bone loss that comes with osteoarthritis (OA) and osteoporosis (OP), this study also looks at the technological methods used to test for these conditions in order to improve therapies and treatment plans for older people. As a matter of consideration, the prevalence of osteoporosis is higher among postmenopausal women (20%) compared to premenopausal women (14.28%) and males (6.77%). The utilization of a preliminary calcaneal Quantitative Ultrasound (QUS) examination is warranted in order to effectively handle the matter of osteoporosis. The prompt assessment of a patient can provide valuable insights into potential fractures and aid in the prevention of bone injury. In a nutshell, it is imperative to comprehend the impact of OA (osteoarthritis) and OP (osteoporosis) on bone health in order to effectively manage the escalating apprehensions surrounding these conditions. Sophisticated diagnostic techniques, such as the calcaneal quantitative ultrasound (QUS) test, have the potential to enhance the well-being of older individuals by enabling early detection and treatment of many ailments.


Assuntos
Doenças Ósseas Metabólicas , Fraturas Ósseas , Osteoartrite , Osteoporose , Masculino , Feminino , Humanos , Idoso , Osteoporose/diagnóstico por imagem , Densidade Óssea , Fraturas Ósseas/diagnóstico por imagem , Fraturas Ósseas/etiologia , Minerais
2.
Chemosphere ; 244: 125411, 2020 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-32050322

RESUMO

Uranium is a long lived radioactive element which is naturally present in minute concentrations in igneous, sedimentary and metamorphic rocks. These rocks when subjected to weathering results in the formation of soil which also has traces of uranium. Distribution coefficient (Kd) is a crucial parameter in environmental assessment which is used to predict the interaction and transport of uranium in groundwater. The objective of the study is to estimate the Kd of uranium in soils and to develop a relation between this and the soil parameters. Seven rock samples and twenty three soil samples were collected during this study. The Kd of rock samples of different grain sizes where determined and the soil samples were analysed for electrical conductivity, pH, grain size, bulk density, particle density, porosity, calcium carbonate, cation exchange capacity and Kd. The Kd of the soil increases with increase in soil pH up to 6, after which it gradually decreases. Multiple regression analysis was performed to quantify the effect of various soil parameters on soil Kd and equations were statistically significant. Thus, soil Kd in a region could be predicted using limited soil properties with such statistically significant equations.


Assuntos
Água Subterrânea/química , Poluentes Radioativos do Solo/química , Solo/química , Urânio/química , Concentração de Íons de Hidrogênio , Análise de Regressão , Poluentes Radioativos do Solo/análise , Urânio/análise , Poluentes Radioativos da Água/análise , Poluentes Radioativos da Água/química
3.
Mater Sci Eng C Mater Biol Appl ; 58: 420-31, 2016 Jan 01.
Artigo em Inglês | MEDLINE | ID: mdl-26478329

RESUMO

The unprecedented increase in human life expectancy have produced profound changes in the prevailing patterns of disease, like the observed increased in degenerative disc diseases, which cause degradation of the bones. Ti-Nb-Ta alloys are promising materials to replace the damaged bone due to their excellent mechanical and corrosion resistance properties. In general metallic foams are widely used for medical application due to their lower elastic moduli compare to bulk materials. In this work we studied the synthesis of 34Nb-29Ta-xMn (x: 2, 4 and 6 wt.% Mn) alloy foams (50% v/v) using ammonium hydrogen carbonate as a space holder. Alloys were produced through mechanical alloying in a planetary mill for 50h. Green compacts were obtained by applying 430 MPa pressure. To remove the space holder from the matrix the green compacts were heated to 180 °C for 1.5h and after sintered at 1300 °C for 3h. Foams were characterized by x-ray diffraction, scanning, transmission electron microscopy and optical microscopy. The elastic modulus of the foam was measured as ~30 GPa, and the values are almost equal to the values predicted using various theoretical models.


Assuntos
Ligas/química , Ligas/síntese química , Manganês/química , Nióbio/química , Tantálio/química , Titânio/química , Força Compressiva , Elementos Químicos , Microscopia Eletrônica de Varredura , Microscopia Eletrônica de Transmissão , Imagem Óptica , Tamanho da Partícula , Porosidade , Pós , Espectrometria por Raios X , Difração de Raios X
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