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Amino acid mediated synthesis of luminescent SnO2 nanoparticles
Archita Bhattacharjee,M. Ahmaruzzaman,Asim K. Sil,Tanur Sinha 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.22 No.-
Tin oxide (SnO2) nanoparticles of average sizes 6, 16 and 33 nm were synthesized successfully by asimple chemical precipitation method using an amino acid, glycine at different calcination temperaturesof 200, 400, and 600 8C, respectively. This method resulted in the formation of spherical, polycrystallineSnO2 nanoparticles with a higher degree of monodispersity. The sizes of the SnO2 nanoparticles werefound to be a factor of calcination temperature. The synthesized SnO2 nanoparticles have atetragonal rutile structure. Due to three dimensional quantum confinement effect shown by thesynthesized SnO2 nanoparticles in their electronic spectra, an increase in band gap energy (3.85–4.21 eV) is observed with a decrease in particle size ( 33 to 6 nm). The synthesizednanomaterials were characterized using X-ray diffraction (XRD), Transmission electronmicroscopy (TEM), and Fourier transformed infrared spectroscopy (FT-IR). The optical propertieswere investigated using UV–vis spectroscopy and photoluminescence spectroscopy (PL). Interestingly, the photoluminescence property was shown by the material calcined at 400 8C. The effects of various polar and non-polar solvents on the absorption spectra of the synthesizedSnO2 nanoparticles were studied. The plausible reaction mechanism for the formation of SnO2nanoparticles was also proposed.
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Heat tolerance in Brazilian hair sheep
Luiza Seixas,Cristiano Barros de Melo,Candice Bergmann Tanure,Vanessa Peripolli,Concepta McManus 아세아·태평양축산학회 2017 Animal Bioscience Vol.30 No.4
Objective: The aim of this study was to evaluate heat tolerance using heat tolerance indices, physiological, physical, thermographic, and hematological parameters in Santa Ines and Morada Nova sheep breeds in the Federal District, Brazil. Methods: Twenty-six adult hair sheep, one and a half years old, from two genetic groups (Santa Ines: 12 males and 4 females; Morada Nova: 7 males and 3 females) were used and data (rectal temperature, respiratory rate, heart rate, skin temperatures; hematological parameters) were collected during three consecutive days, twice a day (morning and afternoon), with a total of six repetitions. Also physical parameters (biometric measurements, skin and hair traits) and heat tolerance indices (temperature-humidity index, Iberia and Benezra) were evaluated. The analyses included analyses of variance, correlation, and principal components with a significance level of 5%. Results: The environmental indices, in general, indicate a situation of thermal discomfort for the animals during the afternoon. Breed significantly influenced (p<0.001) physiological and physical characteristics of skin, hair, biometric measurements and Iberia and Benezra heat tolerance indices. Santa Ines animals were bigger and had longer, greater number and darker hair, thicker skin, greater respiratory rate and Benezra index and lower Iberia index compared with Morada Nova breed. Conclusion: Although both breeds can be considered adapted to the environmental conditions of the region, Morada Nova breed is most suitable for farming in the Midwest region. The positive correlation found between the thermographic temperatures and physiological parameters indicates that this technique can be used to evaluate thermal comfort. Also, it has the advantage that animals do not have to be handled, which favors animal welfare.
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