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Search Results: 1 - 10 of 784446 matches for " Esther M. A. F.;Augusto "
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Nesting and use of pollen resources by Tetrapedia diversipes Klug (Apidae) in Atlantic Forest areas (Rio de Janeiro, Brazil) in different stages of regeneration
Menezes, Giselle B.;Gon?alves-Esteves, Vania;Bastos, Esther M. A. F.;Augusto, Solange C.;Gaglianone, Maria Cristinna;
Revista Brasileira de Entomologia , 2012, DOI: 10.1590/S0085-56262012000100014
Abstract: nesting and use of pollen resources by tetrapedia diversipes klug (apidae) in atlantic forest areas (rio de janeiro, brazil) in different stages of regeneration. the nesting in trap-nests and use of pollen sources in larval food by tetrapedia diversipes klug, 1810 (apidae) was compared between regenerating areas of atlantic forest. the study was conducted between april 2008 and october 2009 at uni?o biological reserve, rio de janeiro, brazil. t. diversipes nested in 66 trap-nests and showed a peak of nesting during the months of highest rainfall. the most frequent pollen type in brood cells during the wet season was dalechampia sp. 1. during the dry season, the type ludwigia sp. was the most frequent, followed by dalechampia sp. 2. the high frequency of dalechampia and ludwigia species in the larval food, observed in both habitats and in the two seasons could be considered relevant for t. diversipes, suggesting highly selective diet based primarily on two plant species unrelated, but similar in size of pollen grains.
The Teaching of Psychology through learning activities from a multidisciplinary approach: increasing motivation and performance La ense anza de la Psicología a través de actividades desde una perspectiva multidisciplinar: aumento de la motivación y rendimiento
José A. Muela,Ana García-León,José M. Augusto,Esther López-Zafra
European Journal of Education and Psychology , 2010,
Abstract: Learning activities may affect specific aspects of certain disciplines and an effort to increase motivation in our students is needed. This study deals with an activity in which students handle content close to two Psychology subjects (Personality and Social Psychology). The main aim was to relate concepts that are approach from the two disciplines by different, but similar, points of view and to increase students’ motivation by their active implication in a learning activity. Students conducted real research which managed theoretical content of these two courses. Two groups of students (experimental and control) participated in this study (N=286). Our results show a significant increase of the participants in this experiment in academic performance in both courses. Participants in this activity have achieved better final grades than their non-participant peers (in both disciplines), and also improved their own performance, enhancing their grades in comparison with the ones they obtained in the first semester. Finally, our results show that there is an increase in performance with these methodologies, even when the subjective assessment of students about their motivation is not so positive. Las actividades de aprendizaje en la ense anza superior deben tener en cuenta que puede afectar a más de una disciplina y que es importante incrementar tanto la motivación como el rendimiento. Nuestro trabajo consistió en un experimento en el que se integraban conocimientos de dos materias (Psicología de la Personalidad y Psicología Social). Estas materias abordan algunos conceptos comunes y se pretendió aumentar la motivación de los alumnos implicándolos activamente en esta actividad que consistió en un experimento real. Participaron dos grupos (experimental y control) (N=286). Nuestros resultados muestran un incremento significativo en el rendimiento en las dos materias para los alumnos del grupo experimental. Además, consiguieron mejores notas e incrementaron su rendimiento, incluso aunque su evaluación subjetiva sobre su motivación no fuera tan positiva.
The Impact of Emotional Intelligence on Nursing: An Overview  [PDF]
José María Augusto Landa, Esther López-Zafra
Psychology (PSYCH) , 2010, DOI: 10.4236/psych.2010.11008
Abstract: In this paper we focus on the role that Emotional Intelligence has on nursing. We pay attention to both students and professionals and the role emotional intelligence has on emotional self-concept and burnout. Our studies with nursing students yield positive relations between the Clarity and Emotional Repair components of Perceived Emotional Intelligence and all scales of the self-concept scale. On the other hand, nursing professionals that have clear feelings about their emotions and situations that occur, and are capable of dealing with those emotions, have lower levels of stress in their work. Also, those nurses who show a high ability to curtail their negative emotional states and prolong positive emotional states show higher levels of overall health than those individuals who have trouble regulating their emotions. Our results imply that the emotional and cognitive dimensions have to be taken into account in future training programs for nursing professionals and students
Novel antimicrobial secondary metabolites from a Penicillium sp. isolated from Brazilian cerrado soil
Petit,Philippe; Lucas,Esther M. F.; Abreu,Lucas M; Pfenning,Ludwig H; Takahashi,Jacqueline A;
Electronic Journal of Biotechnology , 2009,
Abstract: the morphological features of a penicillium, isolated from brazilian cerrado soil, were characterized and showed to be distinctly different from all well-defined penicillium species. chemical and biological investigation on the ethyl acetate extract of this penicillium isolate resulted in the isolation of three new naphthalenoids: a major metabolite, methyl 6-acetyl-4-methoxy-5,7,8-trihydroxynaphthalene-2-carboxylate and two minor ones, methyl 6-acetyl-4-methoxy-7,8-dihydroxynaphthalene-2-carboxylate and methyl 6-acetyl-4-methoxy-5,8-dihydroxynaphthalene-2-carboxylate. their structures were determined based on their mono and bidimensional nuclear magnetic resonance data. acetyl, allyl and methoxyl derivatives of the major metabolite were prepared in order to establish structure-activity relation. antimicrobial activity of the major natural product and its semi-synthetic derivatives was screened by macro dilution methodology and the corresponding minimum inhibitory concentrations were determined. natural secondary metabolite methyl 6-acetyl-4-methoxy-5,7,8-trihydroxynaphthalene-2-carboxylate, isolated in a very high yield (0.3175 mg.l-1) showed to be the most active compound, possessing expressive activity against candida albicans (minimum inhibitory concentration (mic) 32 μg/ml), listeria monocitogenes and bacillus cereus (mic 64 μg/ml for both).
Factors that affect the in vitro production of bovine embryos: A review
M Pfeifer,Luiz F; Schneider,Augusto; Corrêa,Marcio N;
Revista Colombiana de Ciencias Pecuarias , 2008,
Abstract: in vitro embryo production (ivp) represents a way to increase gamete use from animals with high zootechnical value. in spite of the advances obtained in ivp over the last few years, production of transferable embryos is still low. the aim of this review is to discuss ways to produce in vitro embryos, as well as oocytes formation and maturation processes that can be related to the effectiveness of obtained results. some studies show the influence of follicular growth factors, gonadotropins, steroids and other hormones on the follicular development and the quality of the cumulus oocyte complex (coc). the follicular phase of slow growth is critical for the development of the oocyte capacity to reach the final competence and diameter. information about endocrine influences, or likewise, the dependence of growth of small antral follicles when a loss in the oocyte or follicle functionality occurs is scarce in the literature. a variable number of different techniques and protocols for treatment of oocytes donors are described with the aim of improve the results, the cocs recovering rate and the developmental competence in vitro of collected oocytes. from the considerations presented in this review, it is possible to verify the importance of better understanding the factors involved in the ivp process, with the aim of allow new alternatives to increase the results obtained in programs of animal assisted reproduction.
Factors that affect the in vitro production of bovine embryos: A review Factores que afectan la producción in vitro de embriones bovinos: una revisión Fatores que afetam a produ o in vitro de embri es bovinos: A revis o
Luiz F M Pfeifer,Augusto Schneider,Marcio N Corrêa
Revista Colombiana de Ciencias Pecuarias , 2008,
Abstract: In vitro embryo production (IVP) represents a way to increase gamete use from animals with high zootechnical value. In spite of the advances obtained in IVP over the last few years, production of transferable embryos is still low. The aim of this review is to discuss ways to produce in vitro embryos, as well as oocytes formation and maturation processes that can be related to the effectiveness of obtained results. Some studies show the influence of follicular growth factors, gonadotropins, steroids and other hormones on the follicular development and the quality of the cumulus oocyte complex (COC). The follicular phase of slow growth is critical for the development of the oocyte capacity to reach the final competence and diameter. Information about endocrine influences, or likewise, the dependence of growth of small antral follicles when a loss in the oocyte or follicle functionality occurs is scarce in the literature. A variable number of different techniques and protocols for treatment of oocytes donors are described with the aim of improve the results, the COCs recovering rate and the developmental competence in vitro of collected oocytes. From the considerations presented in this review, it is possible to verify the importance of better understanding the factors involved in the IVP process, with the aim of allow new alternatives to increase the results obtained in programs of animal assisted reproduction. La producción in vitro de embriones (PIV) representa una manera de aumentar el uso de gametos de animales con alto valor zootécnico. A pesar de los avances obtenidos en PIV en los últimos a os, la producción de embriones tranferibles sigue siendo baja. El objetivo de esta revisión es discutir maneras de producir embriones in vitro, así como los procesos de formación y de maduración de los oocitos que se pueden relacionar con la eficacia de los resultados obtenidos. Algunos estudios demuestran la influencia de los factores foliculares del crecimiento, gonadotrofinas, esteroides y otras hormonas en el desarrollo folicular y la calidad del complejo del cumulus oocito (CCO). La fase folicular del crecimiento lento es crítica para el desarrollo de la capacidad del oocito de alcanzar la capacidad y el diámetro final. Información sobre influencias endocrinas, o además, la dependencia del crecimiento de peque os folículos antrales cuando ocurre una pérdida en la funcionalidad del oocito o del folículo, es escasa en la literatura. Un número variable de diversas técnicas y los protocolos para el tratamiento de oocitos de las donantes son descritos en esta rev
Antimicrobial properties of sclerotiorin, isocHromophilone VI and pencolide, metabolites from a Brazilian cerrado isolate of Penicillium sclerotiorum van Beyma
Lucas, Esther M.F.;Castro, Mateus C. Monteiro de;Takahashi, Jacqueline A.;
Brazilian Journal of Microbiology , 2007, DOI: 10.1590/S1517-83822007000400036
Abstract: as a part of a research program that aims to identify antibacterial and antifungal substances from fungus specimen of brazilian's cerrado soil samples, penicillium sclerotiorum was identified as a source of secondary metabolites possessing antibiotic activities. this microorganism was cultured in a liquid medium rich in glucose for fifteen days. the resulting ethyl acetate extract was chemically fractionated leading to the isolation of three metabolites pencolide, sclerotiorin and isochromophilone vi. the antimicrobial disc assay activity of these substances towards candida albicans, streptomyces pyogenes, staphylococcus aureus, salmonella typhimurium and escherichia coli was performed. minimum inhibitory concentration (mic) of the compounds was determined. all compounds showed distinguished antimicrobial activities.
EFECTOS DE LAS PROPIEDADES FUNDAMENTALES DE AMPICILINA MATERIA PRIMA EN LAS PROPIEDADES DERIVADAS EFFECTS OF THE FUNDAMENTAL PROPERTIES OF AMPICILLIN RAW MATERIAL IN THE DERIVATIVE PROPERTIES
Julie F. BENAVIDES A.,Esther J. IBARRA J.,érica J. OBANDO M.,Juliana PéREZ L.
Vitae , 2007,
Abstract: Los agentes antimicrobianos son, con frecuencia, los productos que generan más dudas en cuanto su efecto terapéutico, ya que no son pocos los casos en los cuales se ha presentado diferente eficacia clínica entre productos de un mismo principio activo pero de diferentes laboratorios; por lo tanto, es necesario realizar estudios que puedan proporcionar respuestas al por qué de estas variaciones en estos principios activos, y que apunten a acabar o, por lo menos, reducir,las eventuales diferencias entre estos productos terapéuticos. En este sentido, este trabajo busca evaluar los resultados de las características fundamentales (forma externa, estructura interna, e identificación física y química) de ampicilina en polvo, utilizando un producto de marca (polvo en cápsulas), uno genérico (polvo en cápsulas), y diferentes formas cristalinas de la materia prima (en polvo), obtenidas por recristalización en diferentes solventes y a temperatura ambiente. Luego de determinar las propiedades fundamentales de todos los sólidos anteriores, se comparan entre sí basados en los resultados obtenidos en propiedades derivadas como son los perfiles de disolución, analizados por medio de los factores de diferencia y de similitud (f1, f2), y los índices de eficacia microbiana (por medio de la concentración mínima inhibitoria, CMI). Antimicrobial agents often generate doubts concerning their therapeutic effects; it is not infrequent to find differences in the clinical effectiveness among products of the same active principle made by different laboratories. It is, therefore, necessary to carry out studies as to the reasons of such variations in order to reduce or eliminate differences in the therapeutic products. We evaluated the fundamental characteristics (external form, internal structure, and physical and chemical identification) of ampicillin powder using a trade name product (powder in capsules), a generic one (powder in capsules), as well as different crystalline forms of the raw material (also in powder), obtained by recrystallization in different solvents at room temperature. After determining the fundamental properties of the aforementioned solids, they were compared on the basis of the results obtained in their derivative properties such as the dissolution profiles analyzed by means of the difference and similarity factors (f1, f2), and the antimicrobial effectiveness indexes by means of the minimal inhibitory concentration (MIC).
Selection of Neospora caninum antigens stimulating bovine CD4+ve T cell responses through immuno-potency screening and proteomic approaches
Mara S Rocchi, Paul M Bartley, Neil F Inglis, Esther Collantes-Fernandez, Gary Entrican, Frank Katzer, Elisabeth A Innes
Veterinary Research , 2011, DOI: 10.1186/1297-9716-42-91
Abstract: Neospora caninum is a protozoan parasite, closely related to Toxoplasma gondii, which has emerged as a major cause of reproductive failure in cattle worldwide [1,2]. The parasite is now recognised as the most commonly diagnosed cause of abortion in areas with an intensive dairy industry [3]. Infection during pregnancy may result in abortion, depending on the stage of gestation when parasitaemia occurs, or may lead to the birth of a congenitally infected calf [4]. Treatment options are limited, with few chemotherapeutics available which may be problematic to use in meat or milk-producing livestock. Applying management and biosecurity measures such as those detailed in a management scheme recently launched by Defra in the UK (Herdsure) [5], may help to reduce infection levels in the herd; culling of seropositive animals has also been suggested as a method of control [6]. All these approaches can constitute a substantial cost for the farming industry.There is accumulating evidence that cattle previously exposed to the parasite are less likely to abort than those undergoing a primary infection [7] suggesting the development of some form of protective immunity and the feasibility of a vaccination approach. To date only one commercial vaccine [8], based on an inactivated tachyzoite preparation adjuvated with Havlogen [9], has been registered in some countries. This vaccine demonstrated variable reduction in the number of abortions under field challenge condition in Costa Rica [10] and New Zealand [11]. However, it did not prevent foetal infection [12] and did not allow discrimination between vaccinated and naturally infected animals. Studies that have focussed on the evaluation of N. caninum tachyzoite proteins as vaccine candidates in mouse models have given ambiguous results, ranging from 70-90% protection using live attenuated tachyzoites [13] to very little or no protection with the SRS2 antigen and ISCOMs [14]. It appears that immunisation with live attenuated organi
MATHEMATICAL MODELING, AUTOMATION AND CONTROL OF THE BIOCONVERSION OF SORBITOL TO SORBOSE IN THE VITAMIN C PRODUCTION PROCESS I. MATHEMATICAL MODELING
Bonomi A.,Fleury A.T.,Augusto E.F.P.,Mattos M.N.
Brazilian Journal of Chemical Engineering , 1997,
Abstract: In 1990, the Biotechnology and the Control Systems Groups of IPT started developing a system for the control and automation of fermentation processes, applied to the oxidation of sorbitol to sorbose by the bacteria Gluconobacter oxydans, the microbial step of the vitamin C production process, that was chosen as a case study. Initially, a thirteen-parameter model was fitted to represent the batch operation of the system utilizing a nonlinear regression analysis, the flexible polyhedron method. Based on these results, a model for the continuous process (with the same kinetic equations) was constructed and its optimum operating point obtained
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