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RISS 인기검색어
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- 저자 : Santiago Ruiz (검색결과 5 건)
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Mezcal: indigenous Saccharomyces cerevisiae strains and their potential as starter cultures
Francisco Ruiz-Tera´n,Paulina N. Martı´nez-Zepeda,Sara Y. Geyer-de la Merced,Hipo´crates Nolasco-Cancino,Jorge A. Santiago-Urbina 한국식품과학회 2019 Food Science and Biotechnology Vol.28 No.2
In this study, 19 indigenous mezcal Saccharomycescerevisiae strains were screened for their toleranceto grow under different stress conditions and their potentialuse in fermentation. All strains were able to tolerate pHvalue of 3, significant levels of glucose (30%), ethanol(12% v/v), and temperature of 37 C. Eleven of them wereable to grow in presence of 15% of ethanol, but only CH7and PA18 strains grew at 42 C. Both were selected forevaluation of their fermentative abilities in maguey juiceand in a synthetic medium incubated at 30 and 40 C. Temperature of 40 C had a positive effect on the ethanolproduction, increasing the productivity and efficiency inmaguey fermentation. Ethyl acetate, isobutanol and isoamylalcohols production was favored at 30 C. Bothevaluated strains presented a good fermentative capacityand production of volatile compounds, suggesting theirpotential use as starter cultures in mezcal fermentation.
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Alberto Broatch,Manuel Lujan,Santiago Ruiz,Pablo Olmeda 한국자동차공학회 2008 International journal of automotive technology Vol.9 No.2
Most of hydrocarbon (HC) and carbon monoxide (CO) emissions from automotive DI Diesel engines are produced during the engine warm-up period and are primarily caused by difficulties in obtaining stable and efficient combustion under these conditions. Furthermore, the contribution of engine starting to these emissions is not negligible; since this operating condition is highly unfavorable for the combustion progress. Additionally, the catalytic converter is ineffective due to the low engine temperature. In conjunction with adequate engine settings (fuel injection and fresh air control), either the glow plugs or the intake air heater are activated during a portion of the engine warm-up period, so that a nominal engine temperatures is reached faster, and the impact of these difficulties is minimized. Measurement of gaseous pollutants during engine warm-up is currently possible with detectors used in standard exhaust gas analyzers (EGA), which have response times well-suited for sampling at such transient conditions. However, these devices are not suitable for the measurement of exhaust emissions produced during extremely short time intervals, such as engine starting. Herein, we present a methodology for the measurement of the cumulative pollutant emissions during the starting phase of passenger car DI Diesel engines, with the goal of overcoming this limitation by taking advantage of standard detectors. In the proposed method, a warm canister is filled with an exhaust gas sample at constant volumetric flow, during a time period that depends on the engine starting time; the gas concentration in the canister is later evaluated with a standard EGA. When compared with direct pollutant measurements performed with a state-of-art EGA, the proposed procedure was found to be more sensitive to combustion changes and provided more reliable data.
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Arcelio Martinez-Dominguez,Faustino Ruiz-Aquino,Wenceslao Santiago-Garcia,Pablo Antunez,Miguel Angel Lopez-Lopez,Cesar Valenzuela-Encinas,Rossy Feria-Reyes 한국산림과학회 2020 Forest Science And Technology Vol.16 No.3
The estimation of tree biomass serves as a parameter of forest productivity; in addition, it is a method to estimate carbon fixation and storage. Studies on total biomass that include the belowground component for the Pinus genus are scarce in Mexico due to the difficulty and high costs for its quantification. In this study, allometric models were fitted to estimate the total biomass of Pinus patula Schiede ex Schltdl. & Cham., from the pine-oak forest of Ixtl an de Juarez, Oaxaca, for which a destructive analysis was made of 25 trees distributed in five diameter classes, classifying the biomass by components (root, stem, branches and foliage). With the component biomass data, different models were fitted by nonlinear regression techniques, using the diameter at breast height (D, cm) and the total height (TH, m) as independent variables. The model with the best fit was an exponential type y ¼ eðb0þb1 ln ðDTHÞÞ : In this study, it was observed that the studied species stores 22.62% of the biomass in the root, 69.61% in the stem, 5.67% in the branches and 2.11%, in the foliage. The models proposed in this study allow the estimation of total biomass and by structural component independently and additively. Its use is recommended in trees of P. patula, in the range of 5 to 25 cm of diameter at breast height, in forests with similar growing conditions.
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Percutaneous Microwave Ablation of Desmoid Fibromatosis
Martínez-Martínez Alberto,García-Espinosa Jade,Láinez Ramos-Bossini Antonio Jesús,Ruiz Santiago Fernando 대한영상의학회 2021 Korean Journal of Radiology Vol.22 No.6
Objective: To demonstrate the feasibility of percutaneous microwave ablation in desmoid fibromatosis with respect to tumor volume control and improvement in the quality of life. Materials and Methods: Twelve microwave ablations were performed in 9 patients with a histological diagnosis of desmoid fibromatosis between January 2010 and January 2019. The study population included 6 female and 3 male, with an age range of 21–76 years (mean = 46.6 years; standard deviation [SD] = 19.3 years). The mean major axis of the tumors was 10.9 cm (SD = 5.2 cm) and mean lesion volume was 212.7 cm3 (SD = 213 cm3). Their anatomical distribution was as follows: 3 lesions in the thigh, 2 in the gluteus, 2 in the leg and 2 in the periscapular region. We evaluated the reduction in tumor volume and improvement in the quality of life based on the Eastern Cooperative Oncology Group (ECOG) scale. Results: An average tumor volume reduction of 70.4% (SD = 24.9) was achieved, while the quality of life (ECOG scale) improved in 88.9% of patients. Conclusion: Percutaneous microwave ablation may potentially be a safe, effective, and promising technique for controlling tumor volume and improving the quality of life in patients with desmoid fibromatosis.
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