Mise en place du PER en sciences de la nature dans l'espace BEJUNE

L'objet de cette recherche est de décrire l'appropriation et l'usage du PER dans l'enseignement des sciences de la nature, et de tirer de cette description une appréciation du changement que l'introduction de ce plan d'études a pu produire, ou du moins amorcer. Les vaines tentatives d'accès au travail effectif des enseignants nous ont conduits à leur proposer un bref questionnaire de 8 items. Sur un total de 302 envois, 176 questionnaires ont été retournés, dont 132 remplis de façon complète. D'une façon générale, les effets déclarés du PER semblent pour l'instant plutôt faibles, une des préoccupations prioritaires de la majorité des enseignants étant apparemment de disposer d'un programme de contenus enseignables, ce que le PER n'est pas, contrairement aux MER (moyens d'enseignement romands) attendus. (www.hep-bejune.ch)

Direct-push multilevel sampling system for unconsolidated aquifers

An economical multilevel groundwater monitoring system has been developed that can be rapidly installed with a direct-push machine, yet is suitable for sampling across large permeability contrasts. This sealed multiport sampling (SMPS) system consists of up to five lengths of PVC tubing (12mm OD), each with a screen at a specific depth created by drilling 2.5-mm holes. Above and below each screen, round elastomer pieces, with peripheral holes (to clip in the sampling tubes) and a central hole (to hold a discontinuous piece of central tubing at the height of the screen), are emplaced. Cement-bentonite grout is injected via a tremie tube inserted through the discontinuous centre tube into each interval between the sampling screens. The elastomer pieces and central tube prevent grout from reaching the screened interval. A textile wrapped around the system holds the arrangement in place and at the same time serves to filter the groundwater at the level of the sampling screens. The SMPS system was tested at a tetrachloroethene (PCE) contaminated site. The seals effectively separated the sampling intervals even in heterogeneous formations. Furthermore, concentration profiles agreed well with a reference system. The system should be suitable for a wide range of hydrogeological conditions

El Derecho Real de Conservación en Chile.

Tesis (Licenciado en Ciencias Jurídicas)INTRODUCCIÓN: Actualmente y, a consecuencia de nosotros mismo, vivimos en un mundo individualista donde muchas veces olvidamos nuestro entorno y somos un “Papelucho”1, independientes de nuestro entorno y sumergidos en nuestros infinitos sueños despiertos, de pronto, aterrizamos en la realidad, encontrándonos en un mundo que nos rodea y en el cual vivimos, pero sin olvidar que este mundo también vive. Nos encontramos de un momento a otro con la “Señorita Carmen”2 explicándonos que la tierra es redonda como una naranja, y que todo lo que se ve tan inmenso, deja de serlo al verlo dimensionado en tan sólo una fruta3. Y no solo es la literatura la que nos hace despertar, es la historia misma. Hace 519 años exactamente, un hombre con afán de buscar riquezas en las “indias”, llega un 12 de octubre de 1492 a un nuevo continente, América. Si hubiese sabido que descubrió un nuevo continente, quizás habría entendido que el mundo no era plano y que tampoco al final de las aguas existían dragones y un precipicio, sino que el mundo era más grande de lo que creía, que los límites conocidos no eran tales. Pero, aun sabiendo los límites de la tierra, no dimensionamos hasta más o menos recientemente, cuando el hombre, en la década del sesenta, llega al espacio. Es ahí cuando verdaderamente cuantificamos la magnitud del territorio mundial, una visión clara y cósmica del territorio que sin límites y fronteras visibles desde el espacio, habitamos en conjunto y que quizás, producto de esos mismos límites que nos imponemos como planeta y estados, desperdiciamos los innumerables recursos que éste nos entrega generosamente

Feeding Biology of Pectoral Sandpiper Calidris Melanotos (Birds: Scolopacidae) In the Floodplain of the Paraná River, Argentina

This study focuses upon the nourishing biology of the Pectoral Sandpiper at the floodplain of the Paraná river during  spring and summer. Trophic spectrum, feeding selectivity and efficiency, extent of the trophic niche, circadian rhythm of feeding activity, size of preys and habitat preference were evaluated. Twenty eight stomachs were analyzed Containing twenty-seven taxonomic entities: 12 were vegetal 15 animal. The highest index’s values of relative importance were for seeds and coleoptera; showing this a generalist diet. The amplitude of the trophic niche remined constant along the studied periodFeeding was more active during early morning hours. The more frequent prey size were between 1.5 and 5 mm .The habitat preference index was registered only for the beach (Pi=0.7). This work constitutes the first contribution to knowledge of this species feeding ecology in this region.Fil: Bagnarol, Mónica. Universidad Nacional del Litoral. Facultad de Humanidades y Ciencias; ArgentinaFil: Beltzer, Adolfo Hector. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto Nacional de Limnología. Universidad Nacional del Litoral. Instituto Nacional de Limnología; ArgentinaFil: Quiroga, Martin Anibal. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto Nacional de Limnología. Universidad Nacional del Litoral. Instituto Nacional de Limnología; ArgentinaFil: Ducommun, Maria de la Paz. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto Nacional de Limnología. Universidad Nacional del Litoral. Instituto Nacional de Limnología; ArgentinaFil: Ronchi Virgolini, Ana Laura. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto Nacional de Limnología. Universidad Nacional del Litoral. Instituto Nacional de Limnología; Argentin

La nutrition des skieurs-alpinistes les quatre jours avant la compétition: analyse de leurs pratiques et de leurs représentations alimentaires : travail de Bachelor

Le premier objectif de cette étude est de relever les représentations alimentaires des participants à la Patrouille des Glaciers (PDG) 2012. Le deuxième est de comparer leurs pratiques alimentaires avec leurs représentations concernant la nutrition les 4 jours pré-compétition. Le troisième est de mettre en évidence les différences de pratiques alimentaires entre les concurrents des 2 parcours les 4 jours pré-compétition. Finalement, le quatrième est de comparer les pratiques avec les recommandations nutritionnelles pré-compétition du sportif d’endurance

Online monitoring of yeast cultivation using a fuel-cell-type activity sensor

A microbial fuel-cell type activity sensor integrated into 500mL and 3.2L bioreactors was employed for ampero- (μA) and potentiometric (mV) measurements. The aim was to follow the microbial activity during ethanol production by Saccharomyces cerevisiae and to detect the end of carbohydrate consumption. Three different sensor setups were tested to record electrochemical signals produced by the metabolism of glucose and fructose (1:1) online. In a first setup, a reference electrode was used to record the potentiometric values, which rose from 0.26 to 0.5V in about 10h during the growth phase. In a second setup, a combination of ampero- and pseudo-potentiometric measurements delivered a maximum voltage of 35mV. In this arrangement, the pseudo-potentiometric signal changed in a manner that was directly proportional to the amperometric signals, which reached a maximum value of 32μA. In a third type of arrangement, a reference electrode was added to the anodic bioreactor compartment to carry out ampero- and potentiometric measurements; this is made possible by the high internal resistance of the cultivation. In this case, the reference potential rose to 0.44V while the current maximum recorded by the working electrodes reached 27μA. Reference and pseudo-reference electrodes were in all cases K3Fe(CN)6/carbon. Electrodes were made of 9cm2 woven graphite. To compare the electrochemical signals with established values, the metabolism was also monitored for optical density (at 600nm) indicating biomass production. For fructose and glucose conversion, HPLC with an Aminex column and RI detector was used, and ethanol production was analyzed by GC with methanol as internal standard. The combination of amperometric and potentiometric recordings was found to be an ideal setup and was successfully used in reproducible cultivation