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- 저자 : Rivero (검색결과 32 건)
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Dynamic of heat production partitioning in rooster by indirect calorimetry
Riveros Lizana Rony,de Sousa Camargos Rosiane,Macari Marcos,de Paula Reis Matheus,Balbino Leme Bruno,Kazue Sakomura Nilva 아세아·태평양축산학회 2023 Animal Bioscience Vol.36 No.1
Objective: The objective of this study was to describe a methodological procedure to quantify the heat production (HP) partitioning in basal metabolism or fasting heat production (FHP), heat production due to physical activity (HPA), and the thermic effect of feeding (TEF) in roosters. Methods: Eighteen 54-wk-old Hy Line Brown roosters (2.916±0.15 kg) were allocated in an open-circuit chamber of respirometry for O2 consumption (VO2), CO2 production (VCO2), and physical activity (PA) measurements, under environmental comfort conditions, following the protocol: adaptation (3 d), ad libitum feeding (1 d), and fasting conditions (1 d). The Brouwer equation was used to calculate the HP from VO2 and VCO2. The plateau-FHP (parameter L) was estimated through the broken line model: HP = U×(R–t)×I+L; I = 1 if t<R or I = 0 if t>R; Where the broken-point (R) was assigned as the time (t) that defined the difference between a short and long fasting period, I is conditional, and U is the decreasing rate after the feed was withdrawn. The HP components description was characterized by three events: ad libitum feeding and short and long fasting periods. Linear regression was adjusted between physical activity (PA) and HP to determine the HPA and to estimate the standardized FHP (st-FHP) as the intercept of PA = 0. Results: The time when plateau-FHP was reached at 11.7 h after withdrawal feed, with a mean value of 386 kJ/kg0.75/d, differing in 32 kJ from st-FHP (354 kJ/kg0.75/d). The slope of HP per unit of PA was 4.52 kJ/mV. The total HP in roosters partitioned into the st-FHP, termal effect of feeding (TEF), and HPA was 56.6%, 25.7%, and 17.7%, respectively. Conclusion: The FHP represents the largest fraction of energy expenditure in roosters, followed by the TEF. Furthermore, the PA increased the variation of HP measurements.
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CLASSES OF HYPERSURFACES WITH VANISHING LAPLACE INVARIANTS
Riveros, Carlos M.C.,Corro, Armando M.V. Korean Mathematical Society 2012 대한수학회보 Vol.49 No.4
Consider a hypersurface $M^n$ in $\mathbb{R}^{n+1}$ with $n$ distinct principal curvatures, parametrized by lines of curvature with vanishing Laplace invariants. (1) If the lines of curvature are planar, then there are no such hypersurfaces for $n{\geq}4$, and for $n=3$, they are, up to M$\ddot{o}$bius transformations Dupin hypersurfaces with constant M$\ddot{o}$bius curvature. (2) If the principal curvatures are given by a sum of functions of separated variables, there are no such hypersurfaces for $n{\geq}4$, and for $n=3$, they are, up to M$\ddot{o}$bius transformations, Dupin hypersurfaces with constant M$\ddot{o}$bius curvature.
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Tania del Rivero,John R. Bethea 대한골다공증학회 2016 Osteoporosis and Sarcopenia Vol.2 No.3
Objective: To map the progression of osteoporosis following spinal cord injury in mice in specific areas and analyze changes in parathyroid hormone (PTH) and ion levels which could be responsible for overall bone loss. Summary of background data: Spinal cord injury rapidly induces severe bone loss compared to other conditions, yet the cause of this bone loss has not been identified. Studies suggest the bone loss after injury is not solely due to disuse. Methods: To quantify bone loss we weighed individual bones and measured bone mineral density using dual energy X-ray absorptiometry at acute (1 week) and chronic (4 week) time points following a T9 contusion. An ELISA was used to measure blood PTH levels at 1 and 4 weeks after injury. Calcium and phosphate levels were also analyzed at 4 weeks following injury at the University of Miami pathology core. Results: We observed a significant decrease in bone mineral density in hind limbs after an acute injury, and found this bone loss to progress over time. Furthermore, following chronic injury a decrease in bone mineral density is also observed in bones above the level of injury and in the total bone mineral density. We observed a significant decrease in parathyroid hormone levels in injured mice at the chronic time point, but not at the acute time point which suggests this could be involved in the global bone loss following injury. We also observed a significant increase in serum calcium levels following injury which could account for the imbalance of PTH levels.
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CLASSES OF HYPERSURFACES WITH VANISHING LAPLACE INVARIANTS
Carlos M. C. Riveros,Armando M. V. Corro 대한수학회 2012 대한수학회보 Vol.49 No.4
Consider a hypersurface $M^n$ in $\mathbb{R}^{n+1}$ with $n$ distinct principal curvatures, parametrized by lines of curvature with vanishing Laplace invariants. (1) If the lines of curvature are planar, then there are no such hypersurfaces for $n{\geq}4$, and for $n=3$, they are, up to M$\ddot{o}$bius transformations Dupin hypersurfaces with constant M$\ddot{o}$bius curvature. (2) If the principal curvatures are given by a sum of functions of separated variables, there are no such hypersurfaces for $n{\geq}4$, and for $n=3$, they are, up to M$\ddot{o}$bius transformations, Dupin hypersurfaces with constant M$\ddot{o}$bius curvature.
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Cynthia Lisette Jo Rivero,Junior Llontop Torres,Juan Battaglia Aljaro,Sungchul C. Bai 한국수산과학회 양식분과 2021 한국수산과학회 양식분과 학술대회 Vol.2021 No.4
Two experiments were conducted to evaluate the effects of a natural feed additive (Alquernat Inmuplus<sup>®</sup>, AI) on growth performance in fry tilapia, Oreochromis niloticus, and in fry rainbow trout, Orcorhynchus mykiss. Nine group of twenty-five tilapia (0.22±0.03) were randomly distributed into three treatment in triplicates rearing by the laboratory recirculation system, and six groups of four thousand rainbow trout (1.08±0.02) were randomly distributed into three treatments in duplicate rearing by the farm raceway in Peru. This commercial AI is known to contain equal amount of two plant extracts of Coneflower, Echinacea purpurea, and Dandelion, Taraxacum officinale. Fish were fed with three experimental diets consisting of 0 (CON), 2 (T2) and 4 (T4) ml of AI / kg of commercial diets. After 8 weeks of feeding trial, average of weight gain (WG) and specific growth rate (SGR) of tilapia fed T2 and T4 diets were significantly higher than those fish fed with CON diet (p<0.05). Feed conversion ratio (FCR) of tilapia fed T4 diet significantly better than those fish fed with CON diet, however, there were no significant differences among the fish fed T2 and CON diets. In addition, there were no significant differences in survival rate of tilapia fed the all experimental diets (p>0.05). After 90 days of feeding trial, average survival rates of trout feed T2 and T4 diets were significantly higher than those fish fed CON diet (p<0.05). Average FCR of trout fed CON diet were significantly better than those fish fed T4, however, there were no significant differences among the fish fed CON and T2 diets. Also, there were no significant differences in WG and SGR of fish fed all the diets. Therefore, these results indicated that Alquernant Inmuplus® could be beneficial as growth promoter in tilapia and as survival enhancer in rainbow trout, but more studies in the practical farm conditions would be needed.
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Franz E. Lopez-Suarez,Daniel M. Riveros-Riveros,Yolanda Cesteros,Pilar Salagre 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.94 No.-
This study evaluates the techno-economic feasibility to produce tert-butyl ethers of glycerol in Colombiausing glycerol obtained from biodiesel production. The major drawback of this process is related to thehigh costs associated to the isobutylene reagent used for this reaction. Three possible scenarios, usingisobutylene: glycerol molar ratios of 2:1 and 4:1, have been evaluated by simulation and technoeconomicalassessment using pure isobutylene, C4 fraction and a mixture of C4 and isobutylene as well asa refining stage for crude glycerol. The desired product, a mixture of di- and tri- ethers of glycerol (h-GTBE) was obtained in high amounts for the three scenarios (92–99 wt.%) and a direct relation betweenproduction cost and raw material cost was established. The prices for h-GTBE were higher than theproposed selling prices; however, the formation of byproduct (C4 fraction) can make the processcompetitive. h-GTBE production did not have a competitive price for any scenario at high isobutylene:glycerol molar ratio. The production price was lowered by around 20% for all scenarios when crudeglycerol was considered. Finally, competitive price of h-GTBE (0.96 $/kg) and NPV positive was obtainedusing a mixture of C4 and isobutylene and crude glycerol.
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Purchasing Power Parity : Evidence from Won/Dollar Exchange Rates
Park, Young Bae,Kim, Jong Soo,Simon, Sosvilla Rivero 한국생산성학회 2002 THE JOURNAL OF PRODUCTIVITY Vol.8 No.1
Purchasing Power Parity (PPP) is central to exchange rate economics. In its simplest form, PPP provide an equilibrium relationship between exchange rates and national price levels. To test PPP, we use monthly data of won/dollar exchange rate, wholesales price indices and consumer price indices. The data are seasonally unadjusted, and are obtained from the Seoul Bank. The period of investigation is from January, 1973 to December, 1999. In general, we found that the Won/Dollar exchange rate, and the difference in logarithms of whole and retail price indices between Korea and the U. S have unit roots. Also we found no evidence of cointegration for the exchange rate, the statistical tests on the residuals from the cointegrating regression using the wholesale price index are consistent with the hypothesis that the PPP equation represents a cointegrating relationship, but no cointegration is found using the consumer price index. Finally, the Granger causality tests supports the endogeneity of exchange rates and relative prices, thus rendering empirical tests of the PPP theory that ignores this inconsistent.
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