3,263 research outputs found
Study of the dynamics of soft interactions with two-particle angular correlations at ATLAS
Measurements of inclusive two-particle angular correlations in proton-proton collisions at centre-of-mass energies of 900 GeV and 7 TeV are presented. The events were collected with the ATLAS detector at the LHC, using a single-arm minimum-bias trigger, during 2009 and 2010. Correlations are measured for charged particles in the kinematic range defined by pT > 100 MeV and |eta| = 2 are analysed whereas at 7 TeV, a second phase-space region of n_ch >= 20, with a suppressed contribution from diffractive events, is also explored.
Data is corrected using a novel approach in which the detector effects are applied repeatedly to the observable distribution and then extrapolated to a detector effect of zero.
A complex structure in pseudorapidity and azimuth is observed for the correlation function at both collision energies. Projections of the two-dimensional correlation distributions are compared to the Monte Carlo generators Pythia 8 and Herwig++ as well as the AMBT2B, DW and Perugia 2011 tunes of Pythia 6. The strength of the correlations seen in the data is not reproduced by any of the models
Emisión de obligaciones: una alternativa para el financiamiento de la Empresas en el mercado de capitales ecuatorianos
Frente a las necesidades de liquidez, las empresas del sector privado ecuatoriano prefieren utilizar los mecanismos tradicionales de financiamiento, a través de la banca, debido a diferentes causas, como: la falta de decisión y temor de la mayoría de empresarios para abrir su información financiera al público, y el escaso conocimiento de las alternativas que brinda el mercado de valores. Esta investigación tiene como objetivo demostrar que la emisión de obligaciones es una herramienta útil para captar recursos para la empresa en condiciones ventajosas de costo. El trabajo se estructura en cuatro capítulos. En el primero se citan los conceptos y características principales de los temas abordados y se presenta un enfoque general de la situación del mercado de capitales en el país. .Luego se describen las características relevantes de las diferentes fuentes de financiamiento disponibles. El tercer capítulo se centra en el análisis de la emisión de obligaciones, e incluye el desarrollo de un ejemplo práctico para evidenciar las diferencias en costos y procedimientos requeridos, tanto para obtener un crédito bancario como para emitir obligaciones. Se concluye demostrando que la emisión de obligaciones genera un ahorro efectivo para la empresa emisora pero, a cambio, demanda mayor y mejor calidad de información para el mercado.Contadora Pública AuditoraCuenc
Phenolic Profile of Cane Sugar DerivativesExhibiting Antioxidant and Antibacterial Properties
[EN] Health beneficial effects of sugarcane have been attributed to antioxidant components present in the plant material, phenolic compounds having been identified mainly in the raw juice, culms and leaves. However, the presence of specific natural phenolic constituents in non-refined cane sugars and their potential impact on the diet as an alternative to refined sugar have not been completely evaluated. Phenolic constituents of six commercially available sugarcane derivatives (granulated jaggery, muscovado sugar, light and regular jaggery blocks, cane honey and brown sugar) were identified and quantified, in addition to their physicochemical, antioxidant and antimicrobial properties against cariogenic bacteria. Physicochemical and antioxidant properties of raw sugars were highly related to degree of refining of each product. Specific hydroxycinnamic acids (chlorogenic, caffeic, coumaric, ferulic) and flavones (apigenin, tricin, luteolin) were identified and quantified in sugarcane products. Tricin and apigenin were the most abundant phenolics in raw sugars, both considered important bioactive constituents of foods which postulate as nutraceuticals, antiproliferative and chemopreventive agents. Some derivatives and their extracts also exhibited antibacterial properties against Streptococcus mutans and Streptococcus sobrinus. Bioactive compounds identified in raw sugars make sugarcane natural sweeteners a healthier alternative to white sugar, to be used at home and industry. Granulated jaggeries postulate as the best substitutive due to their nutritional benefits and physicochemical attributes.This work was supported by the Universitat Politecnica de Valencia (UPV/PAID2010-2420) and Generalitat Valenciana (GV/2013/047). The authors would like to acknowledge both institutions for financial support.Barrera Puigdollers, C.; Betoret Valls, N.; Seguí Gil, L. (2020). Phenolic Profile of Cane Sugar DerivativesExhibiting Antioxidant and Antibacterial Properties. Sugar Tech. 22(5):798-811. https://doi.org/10.1007/s12355-020-00817-yS798811225Abbas, Syed Rizwan, Syed M. Sabir, Syed D. Ahmad, Aline A. Boligond, and Margareth L. Athayde. 2014. Phenolic profile, antioxidant potential and DNA damage protecting activity of sugarcane (Saccharum officinarum). Food Chemistry 147: 10–16. https://doi.org/10.1016/j.foodchem.2013.09.113.Akuzawa, Kazuhiko, Rie Yamada, Zhuan Li, Ying Li, Hidetaka Sadanari, Keiko Matsubara, Kunitomo Watanabe, Mamoru Koketsu, Yuuzo Tuchida, and Tsugiya Murayama. 2011. Inhibitory effects of tricin derivative from Sasa albo-marginata on replication of human cytomegalovirus. Antiviral Research 91(3): 296–303. https://doi.org/10.1016/j.antiviral.2011.06.014.Al-Fayez, Mohammad, Hong Cai, Richard Tunstall, William P. Steward, and Andreas J. Gescher. 2006. Differential modulation of cyclooxygenase-mediated prostaglandin production by the putative cancer chemopreventive flavonoids tricin, apigenin and quercetin. Cancer Chemotherapy and Pharmacology 58(6): 816–825. https://doi.org/10.1007/s00280-006-0228-3.Alves, Vanessa G., Alan G. Souza, Lucas U.R. Chiavelli, Ana L.T.G. Ruiz, Joao E. Carvalho, Armando M. Pomini, and Cleuza C. Silva. 2016. Phenolic compounds and anticancer activity of commercial sugarcane cultivated in Brazil. Anais da Academia Brasileira de Ciencias 88(3): 1201–1209. https://doi.org/10.1590/0001-3765201620150349.Amer, Said, Ki-Jeong Na, Moshira El-Abasy, Maki Motobu, Yukari Koyama, Kenji Koge, and Yoshikazu Hirota. 2004. Immunostimulating effects of sugar cane extract on X-ray radiation induced immunosuppression in the chicken. 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Plant Foods for Human Nutrition 61: 187–192. https://doi.org/10.1007/s11130-006-0032-6.Duarte-Almeida, Joaquim Mauricio, Giuseppina Negri, Antonio Salatino, João Ernesto de Carvalho, and Franco M. Lajolo. 2007. Antiproliferative and antioxidant activities of a tricin acylated glycoside from sugarcane (Saccharum officinarum) juice. Phytochemistry 68(8): 1165–1171. https://doi.org/10.1016/j.phytochem.2007.01.015.Duarte-Almeida, Joaquim Mauricio, Antonio Salatino, Maria Inés Genovese, and Franco M. Lajolo. 2011. Phenolic composition and antioxidant activity of culms and sugarcane (Saccharum officinarum L.) products. Food Chemistry 125(2): 660–664. https://doi.org/10.1016/j.foodchem.2010.09.059.El-Abasy, Moshira, Maki Motobu, Ki-Jeong Na, Kameo Shimura, Kikuyasu Nakamura, Kenji Koge, Takashi Onodera, and Yoshikazu Hirota. 2003. Protective effects of sugar cane extracts (SCE) on Eimeria tenella infection in chickens. 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Comparative study of the physicochemical, nutritional, and antioxidant properties of some commercial refined and non-centrifugal sugars. Food Research International 109: 614–625. https://doi.org/10.1016/j.foodres.2018.04.047.Lo, Dan-Yuan, Ter Hsiin Chen, Maw-Sheng Chien, Kenji Koge, Akira Hosono, Shuichi Kaminogawa, and Wei-Cheng Lee. 2005. Effects of sugar cane extract on the modulation of immunity in pigs. Journal of Veterinary Medical Science 67(6): 591–597. https://doi.org/10.1292/jvms.67.591.Luximon-Ramma, Amitabye, Theeshan Bahorun, Mohammed A. Soobrattee, and Okezie I. Aruoma. 2002. Antioxidant activities of phenolic, proanthocyanidin, and flavonoid components in extracts of Cassia fistula. Journal of Agricultural and Food Chemistry 50(18): 5042–5047. https://doi.org/10.1021/jf0201172.Moniruzzaman, Shahinuzzaaman, Ahsanul Haque, Rahima Khatun, and Zahira Yaakob. 2015. Gas chromatography mass spectrometry analysis and in vitro antibacterial activity of essential oil from Trigonella foenum-graecum. Asian Pacific Journal of Tropical Biomedicine 5(12): 1033–1036. https://doi.org/10.1016/j.apjtb.2015.09.010.Motobu, Maki, Said Amer, Yukari Koyama, Kenji Hikosaka, Toshiya Sameshima, Manabu Yamada, Kikuyasu Nakamura, Kenji Koge, Chung-Boo Kang, Hideki Hayasidani, and Yoshikazu Hirota. 2006. Protective effects of sugar cane extract on endotoxic shock in mice. Phytotherapy Research 20(5): 359–363. https://doi.org/10.1002/ptr.1860.Mujica, María Virginia, Marisa Guerra, and Naudy Soto. 2008. Effect of cane variety, washing and endpoint temperature on the quality of granulated “panela” sugarcane: Efecto de la variedad, lavado de la caña y temperatura de punteo sobre la calidad de la panela granulada. Interciencia 33(8): 598–603.Murkovic, M. 2003. Phenolic compounds (Hydroxicinammic acids). In Encyclopedia of food sciences and nutrition, 2nd ed, ed. 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Participation of the 39-kDa glycoprotein (gp39) of the vitelline envelope of Bufo arenarum eggs in sperm-egg interaction
The acquisition of egg fertilizability in Bufo arenarum takes place during the oviductal transit and during this process the extracellular coelomic envelope (CE) of the eggs is converted into the vitelline envelope (VE). It has been stated that one of the necessary events leading to a fertilizable state is the proteolytic cleavage of CE glycoproteins in the oviductal pars recta by oviductin, a serine protease. Consequently, there is a marked increase in the relative quantity of glycoproteins with 39 (gp39) and 42-kDa (gp42) in the VE. In the present study, sperm-VE binding assays using heat-solubilized biotin-conjugated VE glycoproteins revealed that both gp39 and gp42 have sperm binding capacity. According to this result, our study was focused on gp39, a glycoprotein that we have previously reported as a homologue of mammalian ZPC. For this purpose, rabbit polyclonal antibodies against gp39 were generated at our laboratory. The specificity of the antibodies was confirmed with Western blot of VE glycoproteins separated on SDS-PAGE. Immunohistochemical and immunoelectron studies showed gp39 distributed throughout the width of the VE. In addition, immunofluorescence assays probed that gp39 bound to the sperm head. Finally, as an approach to elucidate the possible involvement of gp39 in fertilization, inhibition assays showed that pretreatment of eggs with antibodies against gp39 generated a significant decrease in the fertilization rate. Therefore, our findings suggest that gp39, which is modified by oviductal action, participates as a VE glycoprotein ligand for sperm in Bufo arenarum fertilization.Fil: Barrera, Antonio Daniel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Tucumán. Instituto Superior de Investigaciones Biológicas. Universidad Nacional de Tucumán. Instituto Superior de Investigaciones Biológicas; ArgentinaFil: Llanos, Ricardo Javier. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Tucumán. Instituto Superior de Investigaciones Biológicas. Universidad Nacional de Tucumán. Instituto Superior de Investigaciones Biológicas; ArgentinaFil: Miceli, Dora Cristina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Tucumán. Instituto Superior de Investigaciones Biológicas. Universidad Nacional de Tucumán. Instituto Superior de Investigaciones Biológicas; Argentin
Investigación exploratoria en Dos asignaturas de las ciencias sociales y naturales: el lado oscuro del plagio: Exploratory research in Two subjects of the social and natural sciences: the dark side of plagiarism
En este escrito expone el proceso y resultados de la investigación de aula comparada de tipo exploratorio, en contexto teórico práctico y teórico experimental (abstracto) de las asignaturas de planeación estratégica y física mecánica en dos instituciones privadas de educación superior (IES). Enfoque: investigación del docente sobre los estudiantes. En las dos áreas de las ciencias Se determinó el alcance de la lectura comprensiva y escritura académica en la formación del pensamiento complejo. Resultados: Un propósito de la investigación consistió en indagar, encontrar respuestas metodológicas y en esbozar algunas salidas más afines con los cambios que impone la globalización del conocimiento y las exigencias del mercado en el desarrollo de procesos complejos del pensamiento
Survival of Lactobacillus salivarius CECT 4063 and Stability of Antioxidant Compounds in Dried Apple Snacks as Affected by the Water Activity, the Addition of Trehalose and High Pressure Homogenization
[EN] Survival of probiotic microorganisms in dried foods is optimal for water activity (a(w)) values between 0.1 and 0.3. Encapsulating and adding low-molecular weight additives can enhance probiotic viability in intermediatea(w)food products, but the effectiveness of sub-lethal homogenization is still not proven. This study evaluates the effect of 10% (w/w) trehalose addition and/or 100 MPa homogenization onLactobacillussalivariusCECT 4063 counts and antioxidant properties of apple slices dried to different water activity values (freeze-drying to aa(w)of 0.25 and air-drying at 40 degrees C to aa(w)of 0.35 and 0.45) during four-week storage. Optical and mechanical properties of dried samples were also analyzed. Freeze-drying had the least effect on the microbial counts and air drying at 40 degrees C to aa(w)of 0.35 had the greatest effect. Antioxidant properties improved with drying, especially with convective drying. Decreases in both microbial and antioxidant content during storage were favored in samples with higher water activity values. Adding trehalose improved cell survival during storage in samples with a water activity of 0.35, but 100 MPa homogenization increased the loss of viability in all cases. Air-dried samples became more translucent and reddish, rather rubbery and less crispy than freeze-dried ones.This research was funded by Generalitat Valenciana, project reference GV/2015/066 entitled "Mejora de la calidad functional de un snack con efecto probiotico y antioxidante mediante la incorporacion de trehalosa y la aplicacion de altas presiones de homogeneizacion".Burca-Busaga, CG.; Betoret Valls, N.; Seguí Gil, L.; Betoret, E.; Barrera Puigdollers, C. (2020). Survival of Lactobacillus salivarius CECT 4063 and Stability of Antioxidant Compounds in Dried Apple Snacks as Affected by the Water Activity, the Addition of Trehalose and High Pressure Homogenization. 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