Amphipod crustaceans (Corophiidea and Gammaridea) associated with holdfasts of Macrocystis pyrifera from the Beagle Channel (Argentina) and additional records from the Southwestern Atlantic

Amphipod species inhabiting Macrocystis pyrifera holdfasts from the Beagle Channel were studied. The material was obtained by cutting plants at a depth of 8-12 m. Thirty-six corophiidean and gammaridean species were identified. Seven species were new and fourteen had been found previously in the Argentine Sea, although they enlarge their hitherto known geographical distributions along the littoral. Six species are new records from Uruguay. Full descriptions and figures are provided for the seven new species. In addition, new catalogue numbers are provided for those species formerly published without a formal deposit registration. The present work constitutes a paradigm in literature of the first comprehensive study of the amphipod fauna living in the holdfasts of Macrocystis pyrifera, a common and abundant plant in the kelp forests of the Beagle Channel. Moreover, distributional notes of the present list of the species are compared with similar data from the Southern Ocean.Fil: Alonso, Gloria Maria. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Museo Argentino de Ciencias Naturales “Bernardino Rivadavia”; Argentin

El aprovechamiento turístico de los recursos naturales en Loreto (Perú)

International audienceLoreto, el departamento más grande del Perú, alberga un extenso territorio bañado por las aguas del Amazonas y sus afluentes. Esta característica hace que la diversidad biológica y los recursos naturales sean fuente de riqueza de los pueblos indígenas y de ciudades tan características como Iquitos, capital de departamento, marcando de forma innegable su historia y su desarrollo. En épocas recientes, el aprovechamiento de estos recursos a nivel local y departamental ha conocido una nueva manera de evolucionar a través de las prácticas turísticas. A finales de los ochenta y mitad de los noventa este espacio fue objeto de continuas visitas con fines turísticos, que han aumentado en gran número en la última década, marcando de un modo importante el devenir de las Reservas Nacionales de PACAYA SAMIRIA y ALPAHUAYO MISAHANA, áreas que han apostado por el desarrollo local y la protección de sus áreas combinando el aprovechamiento turístico

Biodiversity of the Gammaridea and Corophiidea (Crustacea: Amphipoda) from the Beagle Channel and the Straits of Magellan: a preliminary comparison between their faunas

Gammaridea and Corophiidea amphipod species from the Beagle Channel and the Straits of Magellan were listed for the first time; their faunas were compared on the basis of bibliographic information and material collected in one locality at Beagle Channel (Isla Becasses). The species Schraderia serraticauda and Heterophoxus trichosus (collected at Isla Becasses) were cited for the first time for the Magellan region; Schraderia is the first generic record for this region. A total of 127 species were reported for the Beagle Channel and the Straits of Magellan. Sixty-two species were shared between both passages (71.3 % similarity). The amphipod species represented 34 families and 83 genera. The similarity at genus level was 86.4 %, whereas 23 of the 34 families were present in both areas. For all species, 86 had bathymetric ranges above 100 m and only 12 species ranged below 200 m depth. In the Beagle Channel, only one species had a depth record greater than 150 m, whereas in the Straits of Magellan, 15 had such a record. The Beagle Channel and the Straits of Magellan contain 57.5 % of the species, 71 % of the genera and 77.3 % of the families of Gammaridea and Corophiidea from the entire Magellan region.Fil: Chiesa, Ignacio Luis. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Museo Argentino de Ciencias Naturales "Bernardino Rivadavia"; Argentina. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Departamento de Biodiversidad y Biología Experimental; ArgentinaFil: Alonso, Gloria Maria. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Museo Argentino de Ciencias Naturales "Bernardino Rivadavia"; Argentin

Maximization of monomeric C5 sugars from wheat bran by using mesoporous ordered silica catalysts

The hydrolysis process of a real fraction of arabinoxylans derived from wheat bran was studied. The influence of catalyst type and loading, reaction time and different metal cations were discussed in terms of the hydrolysis yield of arabinose and xylose oligomers as well as the formation of furfural as degradation product. A high yield of arabinoxylans into the corresponding monomeric sugars (96 and 94% from arabino- and xylo-oligosaccharides, respectively) was obtained at relatively high temperatures (180 °C) and short reaction times (15 min) with a catalyst loading of 4.8 g of RuCl3/Al-MCM-48 per g of initial carbon in hemicelluloses.CTQ2015-64892-R (MINECO/FEDER

10th World Congress of Chemical Engineering,

Extraction and Hydrolysis of arabinoxylans have been studied using RuCl3 catalysts over different mesoporous silica supports. Acidity of the catalyst is a key parameter for these processes: the higher the Acidity, the higher the Yield. Ru+3 has demonstrated to be active, as it is a moderate Lewis acid. Arabinose is always faster released than xylose: Arabinose belongs to side chains and it is linked by beta-glycosidic bonds (weak). Xylose belongs to the backbone and it is linked by β -glycosidic bonds (strong).Proyecto CTQ2015-64892-R (MINECO/FEDER

Optimization of the subcritical water treatment from sunflower by-product for producing protein and sugar extracts

Producción CientíficaThis study proposes the valorization of sunflower by-product (SbP) using subcritical water treatment. For this purpose, a response surface methodology in a 3× 3 Box–Behnken design was employed to study the effect of temperature (100– 150 °C), extraction time (5–25 min), and solvent-to-feed ratio (10–20 g bidistilled water/g SbP) on the water-soluble compounds. The highest amount of glucose (5.7-mg/g raw material) and xylose (13.5-mg/g raw material) was obtained at 150 °C and solvent-to-feed ratio of 15 after 25 min of extraction. The highest amount of protein (133.5-mg/g raw material) was obtained at 150 °C and solvent-to-feed ratio of 20 after 15 min of extraction. The selected temperature conditions did not promote the formation of final degradation products such as furfural and 5-hydroxymethylfurfural (HMF). The extracts obtained in this study showed simultaneous recovery of free monomeric sugars that could be used for bioenergy or biochemical, proteins that could be used for food and pharmaceutical industries and phenolic compounds that could be used for food and nutraceutical applications.Junta de Castilla y León and FEDER (project VA277P18) and the EU-FEDER program (CLU-2019-04)Publicación en abierto financiada por el Consorcio de Bibliotecas Universitarias de Castilla y León (BUCLE), con cargo al Programa Operativo 2014ES16RFOP009 FEDER 2014-2020 DE CASTILLA Y LEÓN, Actuación:20007-CL - Apoyo Consorcio BUCL

Evolución de los Flujos de Capital y de la Deuda Externa del Sector Privado en Colombia 1990-2003

En este trabajo se describe la evolución del marco regulatorio del acceso a los capitales externos y la dinámica de los mismos para Colombia durante el período 1990-junio de 2003. El análisis se divide en dos períodos; en el primero 1990-1997, se recibieron importantes flujos de capital de endeudamiento externo de largo plazo e inversiones directas que financiaron, principalmente, la ejecución de proyectos de infraestructura física y y el crecimiento del gasto privado. En el segundo período, se frenó la entrada de nuevos recursos al país, especialmente los vinculados con crédito externo de largo plazo. Adicionalmente, en el documento se muestra el cambio en la estructura de financiamiento del sector privado hacia contrataciones de corto plazo, especialmente notoria a partir de 1998.

EJERCICIO DE ESTIMACIÓN DE LA TASA DE CAMBIO DEL MERCADO LIBRE

La legislación cambiaria vigente permite a los residentes colombianos efectuar transacciones en divisas con no residentes, a través de dos mecanismos: el mercado cambiario regulado y/o el mercado libre. El mercado cambiario regulado está constituido por la totalidad de las divisas que deben canalizarse obligatoriamente por conducto de los intermediarios autorizados o a través de cuentas de compensación en el exterior. En particular, en este mercado se deben negociar las divisas para operaciones de comercio exterior, de inversión extranjera directa y de portafolio, así como de endeudamiento externo entre otras operaciones que se detallan más adelante. En el mercado libre, por su parte, se pueden negociar las divisas que no son de obligatoria canalización en el mercado regulado, como aquellas relacionadas con la prestación (contratación) de servicios no financieros, remesas de trabajadores y movimiento de cuentas libres en el exterior. No obstante, los agentes también pueden utilizar el mercado regulado para canalizar divisas del mercado libre.