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Screening of Industrial Enzymes for Deproteinization of Shrimp Head for Chitin Recovery
Angel U. Valdez-Peña,Adriana Hernandez-Rivera,Iliana M. De-la-Garza-Rodriguez,Judith D. Espinoza-Perez,Georgina C. Sandoval-Fabian,Nagamani Balagurusamy,Juan Carlos Contreras-Esquivel 한국식품과학회 2010 Food Science and Biotechnology Vol.19 No.2
Food grade proteolytic enzymes were examined for deproteinization of shrimp head. Shrimp head was easily deproteinized by Alcalase® and trypsin at a pH of 8.0. Alcalase was chosen as the most efficient commercial enzyme for deproteinization of shrimp head. Alcalase treatment of shrimp head recorded 61% of weight loss on dry basis and a residual protein of 275 mg/g dried shrimp head. The enzymatically deproteinized shrimp head was later demineralized with lactic acid using microwave radiation at 400W. The combination of enzymatic and physicochemical treatments promoted the chitin recovery from dried shrimp head under eco-friendly conditions.
Long-Term Stroke Recurrence after Transient Ischemic Attack: Implications of Etiology
Angel Ois Santiago,Elisa Cuadrado-Godia,Eva Giralt-Steinhauer,Jordi Jimenez-Conde,Carolina Soriano-Tarraga,Ana Rodríguez-Campello,Carla Avellaneda,Diego Cascales,Isabel Fernandez-Perez,Jaume Roquer Go 대한뇌졸중학회 2019 Journal of stroke Vol.21 No.2
Background and Purpose To analyze long-term stroke recurrence (SR) characteristics after transient ischemic attack (TIA) according to initial etiological classification. Methods A prospective cohort of 706 TIA patients was followed up in a single tertiary stroke center. Endpoint was SR. Etiologic subgroup was determined according to the evidence-based causative classification system. Location of TIA and SR was recorded as right, left, or posterior territory. Disability stroke recurrence (DSR) was defined as modified Rankin Scale (mRS) score >1 or a onepoint increase in those with previous mRS >1 at 3-month follow-up. Results During a follow-up of 3,493 patient-years (mean follow-up of 58.9±35.9 months), total SR was 125 (17.7%), corresponding to 3.6 recurrences per 100 patient-years. The etiology subgroups with a higher risk of SR were the unclassified (more than one cause) and large-artery atherosclerosis (LAA) categories. Of the SR cases, 88 (70.4%) had the same etiology as the index TIA; again, LAA etiology was the most frequent (83.9%). Notably, cardioaortic embolism was the most frequent cause (62.5%) of SR in the subgroup of 24 patients with undetermined TIA. Overall, SR occurred in the same territory in 74 of 125 patients (59.2%), with significant differences between etiological TIA subgroups (P=0.015). Eighty-two of 125 (65.6%) with SR had DSR, without differences between etiologies (P=0.453). Conclusions SR occurred mainly with the same etiology and location as initial TIA, although undetermined TIA was associated with a high proportion of cardioaortic embolism SR. More than half of the recurrences caused some disability, regardless of etiology.
Multiple Chemical Sensitivity in Chemical Laboratory Workers
Perez-Crespo, Juan,Lobato-Canon, Rafael,Solanes-Puchol, Angel Occupational Safety and Health Research Institute 2018 Safety and health at work Vol.9 No.4
Background: Multiple Chemical Sensitivity (MCS) is an acquired disease which etiology remains unknown. It is characterized by the development of sensitivity to certain chemical products. Most of the hypotheses formulated to explain the syndrome associate it to a previous exposition to some kind of volatile chemical. University researchers in chemical laboratories suffer a phenomenon of multi-exposition to chemical agents at low concentration during long periods of time although in an irregular form. Many of these chemical agents have similar properties to those suspicious of causing MCS. This article studies the prevalence of MCS in laboratory researchers. Methods: The study group is university researchers in chemical laboratories. The control group was obtained from administrative personnel who work in the same universities and therefore, are not exposed to chemical products from the laboratories, but have the same exposition to the rest of environmental polluting agents from the area and from the buildings of the university. In this study, it is used the Quick Environmental Exposure and Sensitivity Inventory (QEESI) (sensitivity of 92%/specificity of 95%). Results: The results showed that the prevalence of MCS for the university researchers is not related to exposition by inhalation to multiple chemical agents, at low concentration. Conclusions: The results disagree with one of the main etiological hypotheses of MCS, which is based on the existence of hypersensitive people, who presents a response after prolonged expositions to very low concentrations during a long period of time.
Angel T. Pineiro-Vazquez,Jorge R. Canul-Solis,Guillermo O. Jimenez-Ferrer,Jose A. Alayon-Gamboa,Alfonso J. Chay-Canul,Armin J. Ayala-Burgos,Carlos F. Aguilar-Perez,Juan C. Ku-Vera 아세아·태평양축산학회 2018 Animal Bioscience Vol.31 No.11
Objective: The aim of the experiment was to assess the effect of increasing amounts of Leucaena leucocephala forage on dry matter intake (DMI), organic matter intake (OMI), enteric methane production, rumen fermentation pattern and protozoa population in cattle fed Pennisetum purpureum and housed in respiration chambers. Methods: Five crossbred heifers (Bos taurus×Bos indicus) (BW: 295±6 kg) were fed chopped P. purpureum grass and increasing levels of L. leucocephala (0%, 20%, 40%, 60%, and 80% of dry matter [DM]) in a 5×5 Latin square design. Results: The voluntary intake and methane production were measured for 23 h per day in respiration chambers; molar proportions of volatile fatty acids (VFAs) were determined at 6 h postprandial period. Molar concentration of VFAs in rumen liquor were similar (p>0.05) between treatments. However, methane production decreased linearly (p<0.005), recording a maximum reduction of up to ~61% with 80% of DM incorporation of L. leucocephala in the ration and no changes (p>0.05) in rumen protozoa population were found. Conclusion: Inclusion of 80% of L. leucocephala in the diet of heifers fed low-quality tropical forages has the capacity to reduce up to 61.3% enteric methane emission without affecting DMI, OMI, and protozoa population in rumen liquor.
Oral findings and its association with prenatal and perinatal factors in newborns
Perez-Aguirre, Brenda,Soto-Barreras, Uriel,Loyola-Rodriguez, Juan Pablo,Reyes-Macias, Juan Francisco,Santos-Diaz, Miguel Angel,Loyola-Leyva, Alejandra,Garcia-Cortes, Obed The Korean Pediatric Society 2018 Clinical and Experimental Pediatrics (CEP) Vol.61 No.9
Purpose: This study aimed to determine the frequency of abnormalities in the newborn oral cavity and to evaluate the association with prenatal and perinatal factors. Methods: This cross-sectional study evaluated 2,216 newborns. Oral findings were assessed in the first 24 hours of life using visual examination. Sex, weight, length, gestational age, and medical disorders at birth were recorded. Maternal demographic and medical information was also obtained. Results: The most common oral findings were Bohn's nodules, Epstein's pearls, and dental lamina cysts. Other intraoral findings included odontogenic cysts, ankyloglossia, and natal teeth, among others. In logistic regression analyses, folic acid consumption during pregnancy was significantly associated with Bohn's nodules (odds ratio [OR], 1.79; 95% confidence interval [CI], 1.23-2.55; P=0.002), Epstein's pearls (OR, 1.63; 95% CI, 1.14-2.33; P=0.007), and dental lamina cysts (OR, 1.45; 95% CI, 1.02-2.05; P=0.038). Moreover, preterm births were negatively associated with prevalence of Bohn's nodules (OR, 0.63; 95% CI, 0.50-0.80; $P{\leq}0.0001$). Comparison between newborns with and without oral inclusion cysts showed that maternal folic acid and iron intake were significantly different (P<0.05). Conclusion: Maternal folic acid and iron intake were associated with the prevalence of oral inclusion cysts.
Oral findings and its association with prenatal and perinatal factors in newborns
Brenda Perez-Aguirre,Uriel Soto-Barreras,Juan Pablo Loyola-Rodriguez,Juan Francisco Reyes-Macias,Miguel Angel Santos-Diaz,Alejandra Loyola-Leyva,Obed Garcia-Cortes 대한소아청소년과학회 2018 Clinical and Experimental Pediatrics (CEP) Vol.61 No.9
Purpose: This study aimed to determine the frequency of abnormalities in the newborn oral cavity and to evaluate the association with prenatal and perinatal factors. Methods: This cross-sectional study evaluated 2,216 newborns. Oral findings were assessed in the first 24 hours of life using visual examination. Sex, weight, length, gestational age, and medical disorders at birth were recorded. Maternal demographic and medical information was also obtained. Results: The most common oral findings were Bohn’s nodules, Epstein’s pearls, and dental lamina cysts. Other intraoral findings included odontogenic cysts, ankyloglossia, and natal teeth, among others. In logistic regression analyses, folic acid consumption during pregnancy was significantly associated with Bohn’s nodules (odds ratio [OR], 1.79; 95% confidence interval [CI], 1.23–2.55; P=0.002), Epstein’s pearls (OR, 1.63; 95% CI, 1.14–2.33; P=0.007), and dental lamina cysts (OR, 1.45; 95% CI, 1.02–2.05; P=0.038). Moreover, preterm births were negatively associated with prevalence of Bohn’s nodules (OR, 0.63; 95% CI, 0.50–0.80; P≤0.0001). Comparison between newborns with and without oral inclusion cysts showed that maternal folic acid and iron intake were significantly different (P<0.05). Conclusion: Maternal folic acid and iron intake were associated with the prevalence of oral inclusion cysts.
La Economía Terciaria de las Zonas Metropolitanas de Michoacán
Miguel Angel Vite Perez 한국라틴아메리카학회 2011 라틴아메리카연구 Vol.24 No.4
This paper develops a macroeconomic analysis of the service economy in the metropolitan areas of Michoacan, a state in western Mexico whose main characteristic is its weak momentum. The development of a service economy which manifests low rates of growth of services to producer, means that the process is based on the sale of commercial services that generate low income and which do not require the presence of skilled workers.
El Control Fragmentado de la Sociedad de Vigilancia en México
Miguel Angel Vite Perez 한국라틴아메리카학회 2014 라틴아메리카연구 Vol.27 No.3
The purpose of the paper is the development of theoretical interpretations of the surveillance society in a context of expansion of focused social vulnerability, the political power, as a public safety issue, which has created situations of criminalizing illegal. Therefore, the social vulnerability plays territorially because those who suffer lack of protections derived from state institutions, and consequently, their survival depends more illegal economic activities. For the Mexican case, the surveillance technology is used for state authority to criminalize part of the universe of illegality; especially when conflict between legal and illegal violence has become.
Un Ensayo Crítico sobre la Fragmentación Social Mexicana
Miguel Angel Vite Perez,Gabriel Tapia Tovar 한국라틴아메리카학회 2018 라틴아메리카연구 Vol.31 No.3
The aim of the paper is to analyze the concept of social fragmentation with respect to the facts which were important for its construction. Theoretical interpretations of the crisis of the welfare state are applied here, related to the labor society, especially regarding the manner in which wage labor became the main mechanism for social integration. However, the crisis of social integration has resulted in a process of social fragmentation, as seen through the expansion of inequality, poverty and precarious work. In the Mexican case, social fragmentation is not only a result of the crisis of the work society, but also of the establishment of various mechanisms of integration, the loss of which has caused exclusion from social benefits. The limitations of this analysis are derived from the events studied. These events derive from different social contexts, but can be taken as evidence of social fragmentation, formed as a concept, which allows for the study of fragmentation and violence which in Mexico have become part of the reproduction of social relations.