Evidence for maternal transmission fo a putative endosymbiont in the digestive gland of Pomacea canaliculata (Architaenioglossa, Ampullariidae)

The digestive gland of the apple snail Pomacea canaliculata lodges two types of pigmented corpuscles (identified as C and K corpuscles) which has been proposed as endosymbiont/s. Both corpuscular types are always present in the digestive gland of adult snails, they are released into the tubuloacinar lumen and are later expelled in the feces. On their part, hatchlings lack any C or K corpuscles in the digestive gland as well as in their feces, whereas C corpuscles appear in both the gland and feces within one week after hatching. Hence, it is possible that the detritivorous hatchlings acquire the putative C-endosymbiont from feces in the sediments where they live, i.e. through ‘lateral’ or ‘horizontal’ transmission. This possibility was put to test in an experiment in which we prevented any lateral transmission, by a 7-days aseptic culture, with no food, of aseptically obtained hatchlings. At the end of the experiment, we observed that most juveniles had survived the culture period, and hence the digestive glands and feces of survivors were studied by light microscopy of resin embedded, toluidine blue-stained sections. All studied glands and fecal samples showed C corpuscles. It is concluded that lateral transmission of the endosymbiont, if any, is not indispensable for the acquisition of the endosymbiont by hatchlings.Fil: Koch, Eduardo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mendoza. Instituto Argentino de Investigaciones de las Zonas Áridas. Provincia de Mendoza. Instituto Argentino de Investigaciones de las Zonas Áridas. Universidad Nacional de Cuyo. Instituto Argentino de Investigaciones de las Zonas Áridas; ArgentinaFil: Vega, Israel Aníbal. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mendoza. Instituto de Histología y Embriología de Mendoza Dr. Mario H. Burgos. Universidad Nacional de Cuyo. Facultad de Ciencias Médicas. Instituto de Histología y Embriología de Mendoza Dr. Mario H. Burgos; Argentina. Universidad Nacional de Cuyo; ArgentinaFil: Castro Vazquez, Alfredo Juan. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mendoza. Instituto de Histología y Embriología de Mendoza Dr. Mario H. Burgos. Universidad Nacional de Cuyo. Facultad de Ciencias Médicas. Instituto de Histología y Embriología de Mendoza Dr. Mario H. Burgos; Argentina. Universidad Nacional de Cuyo; Argentin

Tensor triangulated category structures in the derived category of a variety with big (anti-)canonical bundle

Let $X$ be a smooth projective variety over $\mathbb{C}$ with big (anti-)canonical bundle. It is known that in this situation the Balmer spectrum of the tensor triangulated category of perfect complexes $Perf(X)$ of $X$ equipped with the derived tensor product $\otimes_{X}^{\mathbb{L}}$ recovers the space $X$. In this work we study the possible tensor triangulated category structures one can put on $Perf(X)$. As an application we prove a monoidal version of the well-known Bondal-Orlov reconstruction theorem

Davydov-Yetter cohomology for Tensor Triangulated Categories

One way to understand the deformation theory of a tensor category $M$ is through its Davydov-Yetter cohomology $H_{DY}^{\ast}(M)$ which in degree 3 and 4 is known to control respectively first order deformations of the associativity coherence of $M$ and their obstructions. \\ In this work we take the task of developing an analogous theory for the deformation theory of tensor triangulated categories with a focus on derived categories coming from algebraic geometry. We introduce the concept of perfect pseudo dg-tensor structure $\Gamma$ on an appropriate dg-category $\mathscr{T}$ as a truncated dg-lift of a tensor triangulated category structure on $H^{0}(\mathscr{T})$ and we define a double complex $DY^{\ast,\ast}(\Gamma)$ and we see that the 4th cohomology group $HDY^{4}(\Gamma)$ of the total complex of $DY^{\ast,\ast}(\Gamma)$ contains information about infinitesimal first order deformations of the tensor structure.Comment: Article draws extensively from author's PhD thesis, found in HAL tel-0401874

Near-infrared follow-up to the May 2008 activation of SGR 1627-41

On 28 May 2008, the Swift satellite detected the first reactivation of SGR 1627-41 since its discovery in 1998. Following this event we began an observing campaign in near infrared wavelengths to search for a possible counterpart inside the error circle of this SGR, which is expected to show flaring activity simultaneous to the high energy flares or at least some variability as compared to the quiescent state. For the follow-up we used the 0.6m REM robotic telescope at La Silla Observatory, which allowed a fast response within 24 hours and, through director discretionary time, the 8.2m Very Large Telescope at Paranal Observatory. There, we observed with NACO to produce high angular resolution imaging with the aid of adaptive optics. These observations represent the fastest near infrared observations after an activation of this SGR and the deepest and highest spatial resolution observations of the Chandra error circle. 5 sources are detected in the immediate vicinity of the most precise X-ray localisation of this source. For 4 of them we do not detect variability, although the X-ray counterpart experimented a significant decay during our observation period. The 5th source is only detected in one epoch, where we have the best image quality, so no variability constrains can be imposed and remains as the only plausible counterpart. We can impose a limit of Ks > 21.6 magnitudes to any other counterpart candidate one week after the onset of the activity. Our adaptive optics imaging, with a resolution of 0.2" provides a reference frame for subsequent studies of future periods of activity.Comment: Accepted for publication in A&

Efecto de dos métodos de laboreo sobre las propiedades físicas del suelo y el desarrollo del girasol (Helianthus annuos).

72 páginas.-- 10 figuras.-- 11 tablas.-- 112 referencias.-- Memoria del XXXVIII Curso Internacional de Edafología y Biología VegetalDirectores: Moreno Lucas, Félix y Murillo Carpio, José ManuelEL laboreo se considera como una alteración mecánica de las capas más superficiales del suelo, con el objetivo de preparar un lecho de siembra o una vez sembrado, mejorar la estructura para crear las condiciones ideales para el adecuado desarrollo del cultivo. Donde dichas alteraciones influyen de diversas formas sobre los componentes del suelo (Urbano, 1988). Según, algunos autores (Hennin y col, 1972; Ortiz-Cañavate, 1975; Márquez, 1985; Urbano, 1988; Pelegrin, 1989) el laboreo, se practica para obtener los siguientes resultados: I .Crear una estructura óptima para la siembra. 2.Mejorar las propiedades fisicas del suelo, que permitan mejorar la captación y retención del agua, dependiendo de su estructura. 3.Eliminación de malas hierbas. 4.Incoorporación de restos de cosechas, fertilización y enmiendas. 5. Eliminación de áreas de compactación, eliminando zonas de encharcamiento y mala infiltración.Peer reviewe

Influencia de pre tratamientos convencionales en el proceso de secado de banano y en las características físicas del producto final

This objective was to evaluate the effects of pre-drying treatments such as osmotic dehydration, antioxidants, and blanching using banana. A dry samples with different pre-treatments were performed to obtain the isotherms of the monolayer, which has a direct relationship with the shelf life. Once drying processes, it was determined the rate of drying where the product has the highest rate of drying is that which was not subjected to any pre-treatment, which is related to life. Subsequently, in addition to the experiment, we determined the shelf life, using the method of Theodore Labuza, proving the relationship and the value of the monolayers of the isotherms and the values of drying rate, which the sample without pre-treatment showed the highest value. Finally, we statistically analyzed the results, with a design of experiments, comparing the response variables with a significance level of 95%

Perceptions of Fishermen Households on the Long-Term Impact of Coastal Resources Management in Panguil Bay

Coastal resources management (CRM) has flourished as a management approach for attaining a more sustainable form of economic development in the coastal areas of the Philippines. Its proliferation, coupled with the reasonably long time it has been in implementation, now calls for an evaluation of its long-term impact as a management and development approach. In this study, the long-term impact of CRM is evaluated not from the perspectives of technical people but based on the perception of its intended primary beneficiaries--the fishermen households. It does so not by looking into a specific CRM program or project but by observing the succession of CRM activities conducted in a single coastal area--Panguil Bay, Mindanao--over many years. The objectives were to ascertain if CRM works, identify its major constraints if it does not, and recommend future courses of actions to address the constraints.coastal resources management, long-term impact indicators, ladder diagram, Panguil Bay

Perceptions of Fishermen Households on the Long-Term Impact of Coastal Resources Management in Panguil Bay

Coastal resources management (CRM) has flourished as a management approach for attaining a more sustainable form of economic development in the coastal areas of the Philippines. Its proliferation, coupled with the reasonably long time it has been in implementation, now calls for an evaluation of its long-term impact as a management and development approach. In this study, the long-term impact of CRM is evaluated not from the perspectives of technical people but based on the perception of its intended primary beneficiaries--the fishermen households. It does so not by looking into a specific CRM program or project but by observing the succession of CRM activities conducted in a single coastal area--Panguil Bay, Mindanao--over many years. The objectives were to ascertain if CRM works, identify its major constraints if it does not, and recommend future courses of actions to address the constraints.coastal resources management, long-term impact indicators, ladder diagram, Panguil Bay

Trabajo de titulación previo la obtención del Título de Arquitecto Urbanista.

Una de las preocupaciones a nivel global; desde lo individual hasta lo gubernamental, es integrar a las personas con diferentes tipos de discapacidades a la sociedad y al mismo tiempo reconocer sus habilidades deportivas, así; una de las formas de inclusión es la práctica deportiva en consideración de que esta favorece el desarrollo psicomotor y la efectividad de cumplimiento de los postulados a su favor. Las leyes adscritas en La carta magna y el buen vivir son derechos intelectuales de todo ciudadano ecuatoriano. El presente análisis tiene como objetivo realizar necesidades físicos y espaciales para las prácticas deportivas de las personas con discapacidades, para la generación de la implantación arquitectónica de un centro adaptado en la ciudad de Ambato, ya que actualmente los centros deportivos de la ciudad de Ambato no constan con las condiciones adecuadas para el desarrollo de las actividades deportivas. Es por esta razón que se propone la creación de áreas adecuadas que impliquen el desarrollo de las actividades deportivas, donde se creara las siguientes zonas; Futbol sala, Goalball, basquetbol, atletismo, natación, residencia, comedor, administración, zona médica, donde cada una de estas mantendrán el mobiliario con las medidas indicadas, guías táctiles, zonas de parqueo definidas, facilidad de acceso, distancias cortas de camineras, posibilidad de mayor práctica deportiva, lo que implica un centro deportivo de alto rendimiento, pensado para personas con discapacidades que genere una verdadera integracion