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- 저자 : Holanda (검색결과 3 건)
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Holanda Debora Muratori,Kim Sung Woo 아세아·태평양축산학회 2021 Animal Bioscience Vol.34 No.3
Objective: This study evaluated the effects of feeding diets naturally contaminated with deoxynivalenol (supplemental 2 mg/kg) on health, growth, and the effects of a mycotoxindetoxifying additive in newly-weaned pigs.Methods: Thirty-six pigs (27 day-old) were housed individually and assigned to 3 treatments for 5 weeks: CON (diet containing minimal deoxynivalenol), MT (diet with supplemental 1.9 mg/kg of deoxynivalenol), and MT+D (MT + mycotoxin-detoxifying additive, 0.2%, MegaFix, ICC, São Paulo, Brazil). The mycotoxin-detoxifying additive included bentonite, algae, enzymes, and yeast. Blood was taken at week 2 and 5. Jejunal tissue were taken at week 5. Data were analyzed using the MIXED procedure of SAS.Results: Pigs fed MT+D tended to have decreased (p = 0.056) averaged daily feed intake during week 1 than MT. At week 2, serum aspartate aminotransferase/alanine aminotransferase in MT tended to be lower (p = 0.059) than CON, whereas it was increased (p< 0.05) for MT+D than MT, indicating hepatic damages in MT and recovery in MT+D. Pigs fed MT had lower (p<0.05) blood urea nitrogen/creatinine than CON, supporting hepatic damage. At week 5, pigs fed MT tended to have reduced (p = 0.079) glucose than CON, whereas it was increased (p<0.05) for MT+D than MT, indicating impaired intestinal glucose absorption in MT, which was improved in MT+D. Pigs fed CON tended to have increased (p = 0.057) total glutathione in jejunum than MT, indicating oxidative stress in MT. Pigs fed MT+D had a reduced (p<0.05) proportion of Ki-67-positive cells in jejunum than MT, indicating lower enterocyte proliferation in MT+D.Conclusion: Feeding supplemental 1.9 mg/kg of deoxynivalenol reduced growth and debilitated hepatic health of pigs, as seen in leakage of hepatic enzymes, impaired nitrogen metabolism, and increase in oxidative stress. The mycotoxin-detoxifying enhanced hepatic health and glucose levels, and attenuated gut damage in pigs fed deoxynivalenol contaminated diets. Objective: This study evaluated the effects of feeding diets naturally contaminated with deoxynivalenol (supplemental 2 mg/kg) on health, growth, and the effects of a mycotoxindetoxifying additive in newly-weaned pigs. Methods: Thirty-six pigs (27 day-old) were housed individually and assigned to 3 treatments for 5 weeks: CON (diet containing minimal deoxynivalenol), MT (diet with supplemental 1.9 mg/kg of deoxynivalenol), and MT+D (MT + mycotoxin-detoxifying additive, 0.2%, MegaFix, ICC, São Paulo, Brazil). The mycotoxin-detoxifying additive included bentonite, algae, enzymes, and yeast. Blood was taken at week 2 and 5. Jejunal tissue were taken at week 5. Data were analyzed using the MIXED procedure of SAS. Results: Pigs fed MT+D tended to have decreased (p = 0.056) averaged daily feed intake during week 1 than MT. At week 2, serum aspartate aminotransferase/alanine aminotransferase in MT tended to be lower (p = 0.059) than CON, whereas it was increased (p< 0.05) for MT+D than MT, indicating hepatic damages in MT and recovery in MT+D. Pigs fed MT had lower (p<0.05) blood urea nitrogen/creatinine than CON, supporting hepatic damage. At week 5, pigs fed MT tended to have reduced (p = 0.079) glucose than CON, whereas it was increased (p<0.05) for MT+D than MT, indicating impaired intestinal glucose absorption in MT, which was improved in MT+D. Pigs fed CON tended to have increased (p = 0.057) total glutathione in jejunum than MT, indicating oxidative stress in MT. Pigs fed MT+D had a reduced (p<0.05) proportion of Ki-67-positive cells in jejunum than MT, indicating lower enterocyte proliferation in MT+D. Conclusion: Feeding supplemental 1.9 mg/kg of deoxynivalenol reduced growth and debilitated hepatic health of pigs, as seen in leakage of hepatic enzymes, impaired nitrogen metabolism, and increase in oxidative stress. The mycotoxin-detoxifying enhanced hepatic health and glucose levels, and attenuated gut damage in pigs fed deoxynivalenol contaminated diets.
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Application of sugarcane bagasse ash in the production of low cost soil-cement brick
Amaral, Mateus C.,Holanda, Jose N.F. Techno-Press 2017 Advances in environmental research Vol.6 No.4
This work investigated the use of sugarcane bagasse ash (SCBA) generated by an energy cogeneration process in sugarcane mill as an alternative raw material in soil-cement brick. The SCBA obtained from a sugarcane mill located in southeastern Brazil was characterized with respect to its chemical composition, organic matter content, X-ray diffraction, plasticity, and pozzolonic activity. Soil-cement bricks were prepared by pressing and curing. Later, they were tested to determine technical properties (e.g., volumetric shrinkage, apparent density, water absorption, and compressive strength), present crystalline phases, and microstructural evolution. It was found that the SCBA contains appreciable amounts of silica ($SiO_2$) and organic matter. The results showed that the SCBA could be used in soil-cement bricks, in the range up to 30 wt.%, as a partial replacement for Portland cement. These results suggest that the SCBA could be valorized for manufacturing low-cost soil-cement bricks.
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Analysis of Polymeric Knitted Fabrics on Properties for Telecommunications Devices Application
Marcos S. Aquino,Samanta M. Holanda,Thiago F. Santos,Moisés V. Melo,Nestor D. L. Junior,Idalmir S. Q. Júnior,Humberto D. Andrade 한국섬유공학회 2019 Fibers and polymers Vol.20 No.11
The growing development of telecommunications, especially mobile telecommunications, has intensified researchinto microfiber antennas in the last years, since these have unique properties as well as a wide range of applications. Theresearch in the field of wearable technology is impelled by the demand for increasingly light and flexible devices, whereelectronic components are entirely embedded in their textile structures. The knitted fabrics have the necessary elasticity tocreate adaptive and sporty pieces, allowing high mobility and comfort to its users. The concept of textile antennas is based onmalleability and, for this reason, they can have great utility in applications where the stiffness of traditional antennas isconsidered a limitation, especially in military or biomedical garments. This study aims to determine the properties of thenatural and synthetic fibers knitted fabric for use in microwave devices, presenting the materials and methods used in theresearch to the prototyping and simulation of a microstrip antenna. Four knitted fabrics with different structures (Jersey andSimple Piquet) and fiber compositions (Cotton and Cotton with Polyamide) were selected. The determination of the electricalproperties was performed through the coaxial probe method to obtain the permittivity and tangent loss properties, and thedetermination of the physical properties according to the technical standards, where the textile properties (weight,dimensional stability, yarn count and tensile strength) of the analyzed samples were determined. The results were analyzedaccording to the proposed application and the CO_Piquet presented the lower loss tangent and better dimensional stability,the microstrip antenna was dimensioned to a frequency of 2.45 GHz according to the transmission line and resonant cavitymethod, and simulated in the HFSS where loss return, radiation diagrams and current density parameters was obtained.
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