Memòria de l'aplicació xat segur v0.1

L'objectiu de l'aplicació es facilitar una eina de comunicació entre usuaris (o Xat) però utilitzant algoritmes de xifratge simètric per tal de codificar els missatges enviats d'un usuari a l'altre, fent aquesta informació inaccessible per a usuaris no desitjats.

JXTA Xat Segur

El projecte que es descriu consisteix en el desenvolupament d'una aplicació de xat emprant la tecnologia P2P, en la qual els missatges que s'intercanvien els diferents interlocutors es transmeten xifrats de forma que ningú fora d'ells pot conèixer el contingut de la conversa

Xat Segur

Es tracta de projectar un sistema de xat o de missatgeria instantània (tipus Messenger o ICQ, però punt a punt en comptes de centralitzat en un servidor), en què la informació vagi xifrada.

Implementació d’un sistema xat multiprotocol fent servir el llenguatge de programació ERLANG

Construcció d’una aplicació amb un llenguatge de programació concurrent i distribuït anomenat Erlang. Erlang és un llenguatge de programació funcional amb avaluació estricta, és a dir, assignació única i que inclou una màquina virtual. L’aplicació desenvolupada ha estat la programació d’un xat multiprotocol, el qual s’ha realitzat una primera part que ha consistit en el construcció d’un servidor per la xarxa local i el seu corresponent client. Llavors per poder fer un client més funcional i útil s’ha implementat un altre protocol, IRC. Al tractar-se d’un llenguatge espacialment dissenyat per treballar en processos s’ha intentat dissenyar d’una manera la qual es pugés aprofitar aquesta qualitat

Aplicació web per treball col·laboratiu : xat col·laboratiu

Aquest projecte està pensat per a la integració d'un xat en una possible Intranet on el control és molt més exhaustiu i on la utilitat de poder xatejar és molt més restrictiva.

Maturation-dependent effects of chlorpyrifos and parathion and their oxygen analogs on acetylcholinesterase and neuronal and glial markers in aggregating brain cell cultures.

An in vitro model, the aggregating brain cell culture of fetal rat telencephalon, has been used to study the maturation-dependent sensitivity of brain cells to two organophosphorus pesticides (OPs), chlorpyrifos and parathion, and to their oxon derivatives. Immature (DIV 5-15) or differentiated (DIV 25-35) brain cells were treated continuously for 10 days. Acetylcholinesterase (AChE) inhibitory potency for the OPs was compared to that of eserine (physostigmine), a reversible AChE inhibitor. Oxon derivatives were more potent AChE inhibitors than the parent compounds, and parathion was more potent than chlorpyrifos. No maturation-dependent differences for AChE inhibition were found for chlorpyrifos and eserine, whereas for parathion and paraoxon there was a tendency to be more effective in immature cultures, while the opposite was true for chlorpyrifos-oxon. Toxic effects, assessed by measuring protein content as an index of general cytotoxicity, and various enzyme activities as cell-type-specific neuronal and glial markers (ChAT and GAD, for cholinergic and GABAergic neurons, respectively, and GS and CNP, for astrocytes and oligodendrocytes, respectively) were only found at more than 70% of AChE inhibition. Immature compared to differentiated cholinergic neurons appeared to be more sensitive to OP treatments. The oxon derivates were found to be more toxic on neurons than the parent compounds, and chlorpyrifos was more toxic than parathion. Eserine was not neurotoxic. These results indicate that inhibition of AChE remains the most sensitive macromolecular target of OP exposure, since toxic effects were found at concentrations in which AChE was inhibited. Furthermore, the compound-specific reactions, the differential pattern of toxicity of OPs compared to eserine, and the higher sensitivity of immature brain cells suggest that the toxic effects and inhibition of AChE are unrelated.

Construção da identidade docente na formação de professores de enfermagem: reflexão mediada por tecnologias digitais

RESUMO Objetivo Analisar o processo de construção da identidade docente na perspectiva do passado, presente e futuro na formação de professores de enfermagem por meio da integração de tecnologias digitais. Método Pesquisa descritivo-exploratória, vertente qualitativa, consolidada na aula presencial “Construção da Identidade Docente” em 2012. Das atividades síncronas e assíncronas, quatro foram analisadas por meio da análise de conteúdo. Resultados No Chat identificaram-se marcas positivas e negativas e a reflexão da construção da própria identidade (seis categorias); no “Túnel do tempo” a projeção da futura identidade (quatro categorias); no “portfólio” a percepção da própria identidade (quatro categorias) e na avaliação da aula, a percepção das experiências vivenciadas na aula (duas categorias). Conclusão A integração das tecnologias digitais favoreceu a discussão e compreensão dos licenciandos, de maneira colaborativa, acerca de como sua identidade é construída e a projeção de sua futura identidade alinhada ao perfil e ao papel do professor exigidos na contemporaneidade.

Role of Na+-K+-ATPase in insulin-induced lactate release by skeletal muscle.

Hyperinsulinemia increases lactate release by various organs and tissues. Whereas it has been shown that aerobic glycolysis is linked to Na+-K+-ATPase activity, we hypothesized that stimulation by insulin of skeletal muscle Na+-K+-ATPase is responsible for increased muscle lactate production. To test this hypothesis, we assessed muscle lactate release in healthy volunteers from the [13C]lactate concentration in the effluent dialysates of microdialysis probes inserted into the tibialis anterior muscles on both sides and infused with solutions containing 5 mmol/l [U-13C]glucose. On one side, the microdialysis probe was intermittently infused with the same solution additioned with 2.10(-5) M ouabain. In the basal state, [13C]lactate concentration in the dialysate was not affected by ouabain. During a euglycemic-hyperinsulinemic clamp, [13C]lactate concentration increased by 135% in the dialysate without ouabain, and this stimulation was nearly entirely reversed by ouabain (56% inhibition compared with values in the dialysate collected from the contralateral probe). These data indicate that insulin stimulates muscle lactate release by activating Na+-K+-ATPase in healthy humans.

Mobilidade de potássio em solos decorrente da adição de doses de cloreto de potássio

Em solos recentemente fertilizados, as plantas absorvem os nutrientes que estão principalmente nas adjacências dos grânulos, cuja composição química é pouco conhecida. Este trabalho teve como objetivo avaliar o gradiente de concentração de K e a concentração eletrolítica a partir da região fertilizada com KCl em cinco solos, que tinham quantidades variáveis de argila (95 a 569 g kg-1) e de matéria orgânica (13 a 54 g kg-1). Os tratamentos consistiram de doses de KCl equivalentes a 0, 50, 100 e 200 kg ha-1 de K2O. Para obter as quantidades a serem aplicadas, considerou-se que essas doses seriam adicionadas sobre a superfície do solo, em linhas distanciadas de 0,70 m, e atingiria uma faixa de 2,5 cm, ou seja, entrariam em contato com 357 m² ha-1 de solo. Cada unidade experimental foi formada pela união de dois tubos horizontais de PVC, cada um com 7,0 cm de diâmetro e 9,0 cm de comprimento, preenchida com solo. Os grânulos de KCl foram distribuídos uniformemente entre duas folhas circulares de papel-filtro (7,0 cm de diâmetro), que foram colocadas na superfície de junção dos dois tubos. O gradiente de concentração de K nos solos foi quantificado por meio da concentração do K trocável (Mehlich-1) em diferentes distâncias a partir do local de aplicação dos grânulos. A movimentação de K variou com o tipo de solo, aumentou com a dose de KCl e foi menor no solo que tinha mais areia e menos matéria orgânica. Após 7 dias, com a maior dose de KCl aplicada (200 mg kg-1 K2O), a movimentação de K foi maior no Cambissolo Húmico léptico CHat (8,4 cm) e menor no Latossolo Vermelho distrófico LVd (6,4 cm). A amplitude de concentração de K no centímetro mais próximo do adubo variou de 9.800 a 16.475 mg kg-1; na camada distante de 4,0 a 5,0 cm dos grânulos, o K variou de 244 a 2.254 mg kg-1. A condutividade elétrica não atingiu valores prejudiciais ao processo germinativo de espécies com média tolerância a sais, mesmo no centímetro mais próximo do fertilizante. O movimento do K nos solos aconteceu em poucos dias, porém a movimentação máxima em cada dose de KCl não teve correlação com nenhum atributo de solo.

Allergies alimentaires rares [Rare food allergies]

A limited number of foods explain the majority of food allergies. These allergies can be due to a weak allergenicity (garlic, onion, potato), or a weak (or increasing) exposure to emergent food allergens which can be imported (exotic fruits), or recently introduced (lupin, buckwheat, sesame, inulin) or modified by the industry (lysats, lecithins, traces of antibiotics, caseinates, molds, dust mite). Others are in relation with rarer cross-reactivity food allergy syndrome (Apiaceae-Compositae-mugwort syndrome, egg-bird syndrome, cat epithelium-pork meat syndrome). Others are rarely identified, because the food is masked (pepper, basilic). We illustrate rare cases of food allergy and discuss the diagnostic management which is based on a meticulous patient history. Un nombre restreint d'aliments explique la majorité des allergies alimentaires. Les allergies alimentaires rares sont dues à une faible allergénicité (ail, oignon, pomme de terre) ou à une exposition faible ou croissante à des aliments émergents, importés (fruits exotiques), introduits (lupin, sarrasin, sésame, inuline), ou modifiés par l'industrie (lysats, lécithines, traces d'antibiotiques, caséinates, moisissures, acariens). D'autres sont en relation avec des croisements d'allergènes rares (syndrome croisé ombellifères-composées-armoise, syndrome oeuf-oiseau, syndrome épithélium de chat-viande de porc). D'autres enfin sont rarement identifiées, car l'allergène est masqué (poivre, basilic). Nous décrivons des cas rares illustratifs et rappelons la démarche diagnostique qui s'appuie sur une anamnèse minutieuse.

[Illustrations de Histoires ou contes du temps passé avec des moralités] / [Non identifié] ; Charles Perrault, aut. du texte

Comprend : [Frontispice : Devant une cheminée, une vieille dame fait le récit de contes à trois enfants.] [Cote : BnF-Impr. microfilm R.24829] ; [Pl. en reg. p. 1 : La rencontre dans la forêt du Petit Chaperon rouge et du Loup.] [Cote : BnF-Impr. microfilm R.24829] ; [Bandeau au titre du conte Le Petit Chaperon rouge, p. 1 : Le Loup dévorant Mère-grand.] [Cote : BnF-Impr. microfilm R.24829] ; [Bandeau au titre du conte Les Fées, p. 5 : Jeune fille donnant à boire à une fée déguisée en vieille femme.] [Cote : BnF-Impr. microfilm R.24829] ; [Bandeau au titre du conte La Barbe bleue, p. 10 : Les deux frères de la dernière épouse de Barbe bleue viennent à la rescousse de celle-ci et terrassent d'un coup d'épée le mari assassin.] [Cote : BnF-Impr. microfilm R. 24829] ; [Bandeau au titre du conte La Belle au bois dormant, p. 18 : Le jeune prince découvre la princesse endormie.] [Cote : BnF-Impr. microfilm R.24829] ; [Bandeau au titre du conte Le Maître Chat ou Le Chat botté, p. 32 : Le Chat botté montrant le château du Marquis de Carabas à son maître accompagné de la Princesse du royaume et d'une escorte royale.] [Cote : BnF-Impr. microfilm R.24829] ; [Bandeau au titre du conte Cendrillon ou La petite pantoufle de verre, p. 40 : Cendrillon quitte précipitamment la salle de bal.] [Cote : BnF-Impr. microfilm R.24829] ; [Bandeau au titre du conte Riquet à la Houpe, p. 51 : Dans la forêt, le prince Riquet à la Houpe demande sa main à la Princesse. En arrière plan les gens du prince s'activent à la préparation du banquet de noce.] [Cote : BnF-Impr. microfilm R.24829] ; [Bandeau au titre du conte Le Petit Poucet, p. 62 : Le Petit Poucet retire les bottes de sept lieues au géant endormi.] [Cote : BnF-Impr. microfilm R.24829] ; [Bandeau au titre du conte L'Adroite princesse ou les Aventures de Finette, p. 77 : Intrusion de Riche-Cautelle, prince indigne, dans les appartements des trois princesses.] [Cote : BnF-Impr. microfilm R.24829]

Identity [R]Evolution: Multi-Disciplinary Perpectives

The identity [r]evolution is happening. Who are you, who am I in the information society? In recent years, the convergence of several factors - technological, political, economic - has accelerated a fundamental change in our networked world. On a technological level, information becomes easier to gather, to store, to exchange and to process. The belief that more information brings more security has been a strong political driver to promote information gathering since September 11. Profiling intends to transform information into knowledge in order to anticipate one's behaviour, or needs, or preferences. It can lead to categorizations according to some specific risk criteria, for example, or to direct and personalized marketing. As a consequence, new forms of identities appear. They are not necessarily related to our names anymore. They are based on information, on traces that we leave when we act or interact, when we go somewhere or just stay in one place, or even sometimes when we make a choice. They are related to the SIM cards of our mobile phones, to our credit card numbers, to the pseudonyms that we use on the Internet, to our email addresses, to the IP addresses of our computers, to our profiles... Like traditional identities, these new forms of identities can allow us to distinguish an individual within a group of people, or describe this person as belonging to a community or a category. How far have we moved through this process? The identity [r]evolution is already becoming part of our daily lives. People are eager to share information with their "friends" in social networks like Facebook, in chat rooms, or in Second Life. Customers take advantage of the numerous bonus cards that are made available. Video surveillance is becoming the rule. In several countries, traditional ID documents are being replaced by biometric passports with RFID technologies. This raises several privacy issues and might actually even result in changing the perception of the concept of privacy itself, in particular by the younger generation. In the information society, our (partial) identities become the illusory masks that we choose -or that we are assigned- to interplay and communicate with each other. Rights, obligations, responsibilities, even reputation are increasingly associated with these masks. On the one hand, these masks become the key to access restricted information and to use services. On the other hand, in case of a fraud or negative reputation, the owner of such a mask can be penalized: doors remain closed, access to services is denied. Hence the current preoccupying growth of impersonation, identity-theft and other identity-related crimes. Where is the path of the identity [r]evolution leading us? The booklet is giving a glance on possible scenarios in the field of identity.

Las tecnologías avanzadas de la información y la comunicación (TIC) y el nuevo paradigma temporal

Se presenta el paradigma temporal desde la perspectiva actual de la sociedad de la información y el conocimiento. Se analiza el tiempo virtual en el ámbito de las TIC. Se estudia el tiempo en los medios de comunicación y la oferta de "tiempo real", lo inmediato, en la sociedad global y su relación con las demandas de información de los usuarios y ciudadanos. Se propone un esfuerzo ético y de transparencia en plena era global y en un mundo marcado por las tecnologías y el tiempo de la información.

Gautieria trabutii (Gasteromycetes), nueva cita para la Peninsula Iberica

Se describe y comenta un raro e interesante hongo hipogeo, Gautieria trabutii (Chat.) Pat. (Gasteromycetes), recolectado por primera vez en la Península Ibérica.

Laboratory Study of Slurry Seal Coats, HR-185, Revised, 1978

Extensive programmed laboratory tests involving some 400 asphalt emulsion slurry seals (AESS) were conducted. Thirteen aggregates including nine Iowa sources, a quartzite, a synthetic aggregate (Haydite), a limestone stone from Nebraska, and a Chat aggregate from Kansas were tested in combination with four emulsions and two mineral fillers, resulting in a total of 40 material combinations. A number of meetings were held with the Iowa DOT engineers and 12 state highway departments that have had successful slurry seal experiences and records, and several slurry seal contractors and material and equipment suppliers were contacted. Asphalt emulsion slurry seal development, uses, characteristics, tests, and design methods were thoroughly reviewed in conjunction with Iowa's experiences through these meetings and discussions and through a literature search (covering some 140 articles and 12 state highway department specifications). It was found that, while asphalt emulsion slurry seals (when properly designed and constructed) can economically improve the quality and extend the life of existing pavement surface, experiences with them had been mixed due to the many material, slurry, and construction variables that affect their design, construction, and performance. The report discusses those variables identified during the course of the project and makes recommendations concerning design procedures, design criteria, specifications and the means of evaluating them.