Eletrofiação e caracterização de membranas biopoliméricas a base de quitosana extraídas dos exoesqueletos de crustáceos

Chitin and chitosan are nontoxic, biodegradable and biocompatible polymers produced by renewable natural sources with applications in diverse areas such as: agriculture, textile, pharmaceutical, cosmetics and biomaterials, such as gels, films and other polymeric membranes. Both have attracted greater interest of scientists and researchers as functional polymeric materials. In this context, the objective of this study was to take advantage of the waste of shrimp (Litopenaeus vannamei and Aristeus antennatus) and crabs (Ucides cordatus) from fairs, beach huts and restaurant in Natal/RN for the extraction of chitin and chitosan for the production of membranes by electrospinning process. The extraction was made through demineralization, deproteinization, deodorization and deacetylation. Morphological analyzes (SEM and XRD), Thermal analysis (TG and DTG), Spectroscopy in the Region of the Infrared with Transformed of Fourier (FTIR) analysis Calorimetry Differential Scanning (DSC) and mechanical tests for traction were performed. In (XRD) the semicrystalline structure of chitosan can be verified while the chitin had higher crystallinity. In the thermal analysis showed a dehydration process followed by decomposition, with similar behavior of carbonized material. Chitosan showed temperature of maximum degradation lower than chitin. In the analysis by Differential Scanning Calorimetry (DSC) the curves were coherent to the thermal events of the chitosan membranes. The results obtained with (DD) for chitosan extracted from Litopenaeus vannamei and Aristeus antennatus shrimp were (80.36 and 71.00%) and Ucides cordatus crabs was 74.65%. It can be observed that, with 70:30 solutions (v/v) (TFA/DCM), 60 and 90% CH3COOH, occurred better facilitate the formation of membranes, while 100:00 (v/v) (TFA/DCM) had formation of agglomerates. In relation to the monofilaments diameters of the chitosan membranes, it was noted that the capillary-collector distance of 10 cm and tensions of 25 and 30 kV contributed to the reduction of the diameters of membranes. It was found that the Young s modulus decreases with increasing concentration of chitosan in the membranes. 90% CH3COOH contributed to the increase in the deformation resulting in more flexible material. The membranes with 5% chitosan 70:30 (v/v) (TFA/DCM) had higher tensile strength

Uma sequência didática a partir da temática terremotos com ênfase em CTS

Throughout its history the population of the region of Mato Grande, which includes the city of João Câmara, in Rio Grande do Norte, was subject to earthquakes. These events are caused by a geological fault, known as fault Samambaia. In the 1980s there was an intensification of this phenomenon culminating in an earthquake 5.1 on the Richter scale in the early hours of November 30, 1986, causing researchers from Brazil and other countries to shift to the region to conduct research in Seismology. During this period there was a strong interaction between scientists and local people. With the aim of studying how people experienced that moment that marked the history of the city of João Câmara, from interviews with some individuals who witnessed the incident, is that this research was developed. Taking as a theoretical approach to Science, Technology and Society (STS), aimed to thus carry the theme in a systematic way to the classroom, promoting ways to help teachers with the scientific training and guidance to students in case of occurrence of earthquakes

Fontes primárias da história do vácuo e da pressão atmosférica na sala de aula: cartas e jornais históricos em articulação com o livro-texto do ensino médio

The use of the History and the Philosophy of Science (HPS) for the teaching of science and scientific subjects has been advocated in recent decades. It has been pointed out that the History of Science could make for a deeper learning of scientific concepts, since it would promote a contact with the problems which that knowledge has set out to solve. Furthermore, historical episodes would serve to put the discussions about the nature of scientific knowledge into context. With a view to explore those potentialities, the literature in the field has sought to identify the challenges and obstacles for the didactic transposition of subjects from the History of Science. Amongst many aspects, the deficiencies in the training of teachers, so that they can work with the insertion of HPS in the classroom have been highlighted. Another aspect that has been mentioned to be a challenge has to do with the didactic transposition of the Primary Sources, that is, of the original texts on the History of Science. The Primary Sources have significant potentialities: making a connection possible between scientists and concepts, showing the difficulties faced during scientific endeavors, perceiving the role of mistakes as obstacles to be surpassed, not as defeat, etc. On the other hand, there has been little exploration of these concepts in an educational context, due to their own peculiarities. The original texts are often hard to understand and their interpretation demands knowledge of the historical and scientific context in which they were written, as well as skills pertaining to the conduction of research in the field of the History of Science. With this scenario in mind, the research towards this Professional MSc degree starts from the challenge of elaborating and discussing proposals which could enable the didactical transposition of the Primary Sources. We have worked specifically with Primary Sources on the History of the Vacuum and of the Atmospheric Pressure, because of the insertion of these subjects in the Brazilian High School curriculum, in connection with the didactical textbooks. "Historic Journals" were made up from clippings of the original historical texts, as was a Didactical Unit, which takes the usual textbooks as a basis and contemplates using the Journals and the entire Primary Sources in High School. At last, we have elaborated and implemented a course designed for the preparation of teachers and for being an opportunity for the discussion of the feasibility of putting these kinds of proposal into practice

Ética: neurocência e neuroética

L étude de la neuroétique, est placée dans le champs de l étique philosophique, où l émotion et la ration se trouve comme des elements important dans le processus des decition moral. Les champs d étude de la neuroscience et neuroéthique ouvre la discussion sur le changement et les emergences conceptuels, le progrés da la science, le devéloppement de la tecnique, de la tecnhologie et la biotecnologie, et ses relations vis-a-vis des dilemes morales concernat au champs des études et recherches dans ce domaine. On compprende que les procedures adoptés em ces études et recherches ne sont pas concernant solement aux individus soumises aux procedures et or traitement, mas a tout la societé. Le champs d étude de la neuroscience comme quelque d outre est soumis a des principles morales et étiques, sourtout c est relatifs aux prises de decition par rapport aux êtres vivants. Dans ces processus les scientifiques sont charchées des responsabilités et des risques, en face des dilemes morales concernat a tout les recherches. L analise a été faite, appui dentre outres, en la pensée de Immanuel Kant et Jonh Stuart Mill em ce que dit respect au devoir et l utilité

Implicações do odor na percepção e escolha de parceiro

Why are we attracted to some people but not to other ones? How is this attraction established? Which signs are characteristic of a good partner? These and many other questions concerning how mate attraction and mate selection work out among humans have been intriguing behavioral scientists. It is well-known that beauty indicates something about a potential mate s health. The odor may indicate a similar assessment, if we can assess how pheromones are integrated into human sexual behavior. However, what is the relation between age preference and body scent evaluation? In order to investigate this question, this study´s objective was identifying evidences which show that olfactory cues might reveal the potential mate s age and that it coincides with the ideal mate s profile. To produce the stimuli, men and women had to wear cotton t-shirts for three nights in order to have their body odor impregnated. After that, opposite-sex individuals evaluated the intensity and attractivity of these odor impregnated tshirts according to two Likert scales (4 points scale for intensity; 7 points scale for attractivity). We found differences between men and women on body scent perception, that indicates a better scent discrimination for women when it concerns the perception of potential mate s age. Another finding was the negative correlation between intensity and attractiveness perception for both sexes. We also verified that mate selection strategies are plural, more than one tactic simultaneously fitting in the same strategy, but all of them are related to differential investment of each sex on their own reproductive success

Da compreensão novas viagens de Gulliver

Ayant comme opérateur cognitif le livre Les Voyages de Gulliver, de Jonathan Swift, la thése, écrite au format d'un journal de bord, suit dévoilant des indices pour une archéologie de la compréhension, au-delà de problématiser les interconexions entre communication et compréhension à l'actuel procés de planétarism. En suite, réalise quelques essais qui problématisent l'éthique, la science, et la condition humaine, sous l'inspiration du Parlément des Choses, suggéreé par Bruno Latour, où sont présents, symétriquement, les sciences, les scientists, les politiques, les natures, les cultures, et les sociétés. Pour une telle aventure, sont agencées des ideas de penseurs de diverses domaines de la connaissance, comme Edgar Morin, Henri Atlan, Hans-Georg Gadamer, Isabelle Stengers, David Bohm, Maria da Conceição de Almeida, Cremilda Medina, María Zambrano, Michel Serres, Boris Cyrulnik, dentre autres. Lettres de musique, registres littéraires et cinématographiques servent de points d'appuy pour la contextualization du récit de ce voyage qui ne comporte pas seulement la compréhension de la compléxité de l'être-humain, mais aussi, la compréhension des conditions dans lequelles sont forgées les mentalités et pratiques les actions. Ainsi, toule compréhension est un voyage sans fin: arrive à quelques ports, se ré-approvisionne et part à nouveau. Toute compréhension est ponctuelle, parcielle, provisoire, lacunaire et inachevée.

Saúde pública e as empresas químico-farmacêuticas

O artigo trata da formação da indústria farmacêutica brasileira. Aborda algumas questões de história econômica e social, tais como o surgimento do sistema de saúde pública, as práticas de combate às doenças infecciosas, desde as desinfecções e produção de substâncias químicas pela indústria, à soroterapia e produção de soros e vacinas nas instituições de pesquisa científica públicas e nas empresas farmacêuticas privadas. Toma para análise da indústria farmacêutica privada nacional, a empresa Instituto Pinheiros - Produtos Terapêuticos S.A., enfatizando as relações entre seus cientistas, no desenvolvimento de produtos, de tecnologia e da própria discussão científica com as instituições públicas de pesquisa criadas no âmbito da política de saúde pública pelo estado de São Paulo.

Actores politicos y politicas de poblacion en un sistema democratico

Incluye Bibliografía

En memoria de Pedro Vuskovic

Para quienes compartimos con Pedro Vuskovic una experiencia de amistad y colaboración profesional a lo largo de muchos años, la noticia de su fallecimiento en México nos ha provocado un sentimiento de profundo pesar. No sólo por las circunstancias mismas de su muerte, al cabo de una cruel enfermedad que fue minando gradualmente su capacidad física -aunque no la intelectual- sino por la pérdida de un latinoamericano de gran valía, de un maestro formador de numerosas generaciones de jóvenes de nuestro continente, y del compañero de tantas jornadas de lucha intelectual y política. Pedro ingresó a la CEPAL en 1950, prácticamente desde los inicios de la institución. Por espacio de casi 20 años realizó en su seno una brillante labor profesional, habiendo culminado su carrera en ella como Director de la División de Desarrollo. Sus aportes fueron decisivos para la estructuración y difusión del pensamiento cepalino, en una época en la que bullían las inquietudes de una pléyade de talentosos economistas y otros cientistas sociales. Eran los años de la posguerra, los cincuenta y los sesenta, cuando era menester "construir" a América Latina. Y Pedro Vuskovic colocó muchos ladrillos en esa colectiva construcción teórico-política que ha tenido tanta trascendencia para los países de la región. Coetáneamente, fue profesor en los programas de capacitación de la CEPAL y del ILPES, a la vez que impartía clases en la Escuela de Economía y en la de Sociología de la Universidad de Chile, así como en la Escuela de Economía de la Universidad de Concepción. Al retirarse de la CEPAL se incorporó de lleno a la actividad académica, desempeñándose como Director del Instituto de Economía de la Universidad de Chile, para luego pasar a ocupar un lugar de primer plano en la política chilena. En noviembre de 1970 fue designado Ministro de Economía por el Presidente Salvador Allende y en junio de 1972 pasó a ocupar el cargo de Vicepresidente Ejecutivo de la Corporación de Fomento de la Producción, con rango de Ministro, el que desempeñó hasta septiembre de 1973. Cuando las circunstancias políticas lo llevaron al exilio en México, país que lo acogió generosamente, como a tantos otros latinoamericanos que enfrentaban problemas similares, Pedro siguió desarrollando una importante labor académica, primero en el Centro de Investigación y Docencia Económicas, donde dirigió el Instituto de Estudios Económicos de América Latina, y posteriormente en el Centro de Investigaciones Interdisciplinarias en Humanidades de la Universidad Nacional Autónoma de México, donde fue designado Coordinador de un programa de estudios sobre pobreza y alternativas de desarrollo en diversos países de Latinoamérica. Aun cuando será recordado por su importante actuación política, su labor como académico y economista debe ser especialmente destacada. Junto con ser un expositor brillante, metódico e incisivo, que dominaba sus temas con gran sapiencia y amplitud, Pedro sentía un especial regocijo de estar con la juventud, estimularla intelectualmente y ser estimulado por ella. Las muchas generaciones de estudiantes latinoamericanos que tuvieron la fortuna de ser sus alumnos pueden dar testimonio de ello. A su vocación de investigador y maestro, Pedro Vuskovic unía una profunda sensibilidad política y social, que lo llevó a tomar como propia la causa de los pobres y los desamparados de América Latina, cuya situación pudo conocer muy tempranamente en su vida a través de los numerosos trabajos que realizó dentro del ámbito de la CEPAL. Fue tenaz y consecuente en sus ideas y principios, y luchó por ellas en todas las arenas en que estuvo situado --académicas y políticas- hasta el final de su vida. Quienes fuimos sus amigos y colegas recordamos también su bonhomía, sentido del humor y gran calidad humana, rasgos que iban unidos a una lealtad a toda prueba a sus principios valóricos. Nuestra despedida es con emoción; Pedro Vuskovic nos deja un legado de recuerdos y enseñanzas que tendremos siempre presentes. En nombre de sus amigos y colegas, Jacobo Schatan, Ex Director de la División Agrícola Conjunta CEPAL/FAO

On expectation of life in bivariate survival analysis

Includes bibliography

Affordances: a relação entre agente e ambiente

Pós-graduação em Filosofia - FFC

Produção de levana e bioetanol utilizando cascas de banana por Zymomona mobilis

Pós-graduação em Engenharia e Ciência de Alimentos - IBILCE

Campo de velocidade para as estações da RBMC e do IGS localizados na placa Sul-Americana: estimativa a partir do processamento de dados GPS

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Entre o fazer e o ensinar antropologia: a graduação em Ciências Sociais no Estado de São Paulo

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Desenvolvimento sustentável: uma análise a partir do Relatório Brundtland

Pós-graduação em Ciências Sociais - FFC