277 research outputs found
Behavioral and Memory Boosting Effects of Intellan and Cyanocobalamin in Mice
No full textThe aim of this study was to compare the effect of selected drugs, Intellan and cyanocobalamin on some aspects of animal behavior, like effect on memory, depression, gross behavior and exploratory activity. Results of present investigations reveals cyanocobalamin to be a good memory enhancer and intellan also showed memory boosting effects in addition to anti-anxiety activity which affects overall performance. </jats:p
Social context modulates digestive efficiency in greylag geese (Anser anser)
No full textIn group-living animals, social context is known to modulate physiology, behaviour and reproductive output as well as foraging and nutritional strategies. Here we investigate the digestive efficiency of 38 individuals belonging to different social categories of a semi-feral and individually marked flock of greylag geese (Anser anser). During 9 consecutive days in winter 2017, when the ground was fully covered with snow (i.e. no grass or other natural forage available) and the accessible food was standardized, 184 individual droppings were collected and analysed to estimate the apparent digestibility of organic matter (ADOM). Lignin was used as an indigestible internal marker in the food and droppings. The digestive efficiency was higher in pairs with offspring as compared to pairs without offspring or unpaired birds. Furthermore, individuals with high ADOM were more likely to breed successfully in the following season than those with low ADOM. Our findings demonstrate that social status modulates digestive efficiency, probably via a chain of physiological mechanisms including a dampened stress response in individuals enjoying stable social relationships with and social support by their family members (i.e. their own pair-partner and offspring). Our findings underline the importance of the social network in modulating physiology, such as digestive efficiency, and ultimately reproductive success.© The Author(s) 201
Hepatic Myelolipoma and Amyloidosis with Osseous Metaplasia in a Swan Goose (Anser cygnoides)
No full textAn adult swan goose (Anser cygnoides) kept in a zoological garden had gross hepatic enlargement with extensive ill-defined white foci. Microscopically, the hepatic lesions were composed of a mixture of adipocytes and myeloid cells. The goose was also affected with systemic amyloiclosis and there were areas of osseous metaplasia associated with deposition of amyloid within the liver
Parental behaviour and family proximity as key to gosling survival in Greylag Geese (Anser anser)
No full textReproductive success in monogamous species is generally affected by both behavioural and hormonal fine-tuning between pair partners. Vigilance, defence and brooding of offspring are among the main parental investments, and often the sexes adopt different roles. In the present study, we investigate how sex differences in parental behaviour and family proximity in the socially monogamous Greylag Goose (Anser anser) affect gosling survival. During the reproductive season in spring 2013, we recorded the behaviour of 18 pairs with offspring and gosling survival in a semi-tame, long-term monitored, and individually marked flock of Greylag Geese in Grünau, Austria. We found that behavioural role differentiation between the parents varied with developmental phase, and thus with gosling age. Especially during the first 10 days after hatching, females were foraging more frequently than males, which were more vigilant and aggressive towards other flock members. Such differences between the sexes levelled out 20 to 30 days after hatching. In general, females stayed in closer proximity to their offspring than males. Gosling survival was high when the parents were relatively aggressive and emphasized vigilance rather than foraging behaviour. Hence, we show a direct link between pair partners’ quality of parental investment and gosling survival.© The Author(s) 201
A systematic review of the parasites (Plathelminthes: Cestoda) of the domestic goose (Anser anser dom.)
No full textIn many countries, poultry (including Anser anser dom.) play an important role in meeting population needs for meet. One of the factors that affect directly the meat quality and the industrial products obtained from domestic waterfowl are helminths, which cause diseases in their hosts. Helminthological research of the helminth fauna of domestic geese has been carried out in many countries, including Azerbaijan. Nevertherless, there is no general survey or species list of the world fauna of the domestic goose helminths. Tapeworms (Class: Cestoda) also parasitize the geese, causing them serious harm. Taking into account the relevance of the topic, we set the task to determine and systematize the species composition of tapeworms parasitizing the domestic goose (A. anser dom.) with the use of extensive literature data and our personal material. The species list is arranged in alphabetical order, families, genera and species of cestodes follow the nomenclature and classification by Khalil et al. (1994) and Olson et al. (2001), with updates by Kuchta et al. (2008) and Caira et al. (2014). We also took into account the classification adopted from the database of Fauna Europaea. Each species is provided with the following data: scientific name, author and year of description, synonyms, final, intermediate and auxiliary hosts, habitat in the bird body, collecting localities, geographic distribution, prevalence (PI) and intensity (II) of infection, and literature sources. An analysis of the worldwide literature and our personal data has established that 147 helminth species (Trematoda – 64 species, Cestoda – 33, Nematoda – 46, Acanthocephala – 4) are hitherto known from the domestic goose. The 33 tapeworm species of this list belong to five families (Dilepididae – 1 species, Hymenolepididae – 27, Mesocestoididae – 1, Paruterinidae – 1, and Diphyllobothriidae – 3). In Azerbaijan, 11 cestod species were found in the domestic goose. Six of them (Diorchis inflata, Drepanidotaenia lanceolata, D. przewalskii, Fimbriaria fasciolaris, Tschertkovilepis setigera, Ligula intestinalis) were registered in the course of our helminthological studies. The cestodes D. inflata and L. intestinalis were recorded in domestic geese in Azerbaijan for the first time. Five helminth species (Dilepis undula, Drepanidotaenia lanceolata, Ligula interrupta, L. intestinalis, Schistocephalus solidus) parasitize both birds and mammals (D. lanceolata in humans). Of these, two species (D. lanceolata and L. intestinalis) were found in Azerbaijan
Software de control y determinación de actitud para la flotilla de nanosatélites ANSER
No full textA lo largo del siguiente documento se expone el trabajo realizado por parte del autor dentro de la Universidad Politécnica de Madrid en colaboración con el Instituto Nacional de Técnica Aeroespacial en la misión ANSER. Dicha misión consiste en el desarrollo y despliegue de una flota de nanosatélites que tendrán como objetivo principal el análisis del estado de algunos embalses de la Península Ibérica a través de la instrumentación necesaria a tal efecto (cámaras y espectrómetros). Por otro lado no ha de olvidarse la gran repercusión a nivel I+D que un proyecto de clusterización pionero como ANSER supone para el campo del espacio y de la informática. Debido a la naturaleza de tiempo real de una misión espacial, parte de este docu- mento se centra en el análisis realizado de forma previa al desarrollo software. En él se estudia en detalle la plataforma escogida así como el computador de a bordo y el sistema operativo en tiempo real mediante el desarrollo de diferentes escenarios de prueba, entre los que se incluyen “test benchmarks”. Como resultado del análisis de idoneidad, se concluye que la elección de los citados componentes propuestos se ajustan a los requisitos de forma satisfactoria. Por otro lado, este documento se centra en el módulo software encargado del sistema de control y determinación de actitud de cada uno de los satélites del cluster ANSER. Desde el diseño de la arquitectura software de alto nivel y los detalles de la implementación más relevantes, hasta llegar al diseño de los escenarios de prueba, se cubren todos los aspectos fundamentales de dicha misión en lo relativo al campo de la ingeniería informática. De forma adicional, se proporciona una introducción a los diferentes ámbitos de la informática que han dado forma al proyecto ANSER, como son los sistemas operativos en tiempo real, la planificación de tareas, los algoritmos de control de un sistema autónomo, así como el análisis de la complejidad software de cara a probar la robustez del código entre otros.---ABSTRACT---The following document presents the work carried out by the author within the Polytechnic University of Madrid in collaboration with the National Institute of Aerospace Technology in the ANSER mission. This mission consists of the development and deployment of a fleet of nanosatellites whose main objective will be the analysis of the condition of some reservoirs in the Iberian Peninsula by using the necessary instruments (cameras and spectrometers). On the other hand, we must not forget the great repercussion at the R+D level that a pioneering clustering project such as ANSER represents for the field of space and IT. Due to the real-time nature of this space mission, part of this document focuses on the analysis performed prior to software development. It studies in detail the chosen platform as well as the on-board computer and the real-time operating system by developing different test scenarios, including test benchmarks. As a result of the suitability analysis, it is concluded that the choice of these proposed components meets the requirements in a satisfactory manner. On the other hand, this document focuses on the software module in charge of the attitude and determination control system for each of the satellites in the ANSER cluster. From the design of the high-level software architecture and the most relevant implementation details, to the design of the test scenarios, all the fundamental aspects of this mission are covered in terms of computer science. Additionally, an introduction is provided to the different computing fields which have shaped the ANSER project, such as real-time operating systems, task planning, control algorithms of an autonomous system, as well as the analysis of software complexity in order to test the code consistency, among others
Subsistema de Determinación y Control de Actitud de los Nanosatélites ANSER
No full textLa misión ANSER tiene como objetivo coordinar tres nanosatélites equipados con instrumentación científica (espectrómetros y cámaras pancromáticas) para realizar mediciones sobre la calidad de las aguas pertenecientes a embalses situados en la Península Ibérica.
Esta tesis presenta el diseño, validación y operación del subsistema de determinación y control de actitud, responsable de realizar las maniobras pertinentes para lograr el vuelo en formación y ofrecer una alta precisión y estabilidad para la carga útil.
El trabajo llevado a cabo por el autor durante su colaboración con la ETSIInf. (Universidad Politécnica de Madrid) y el Instituto Nacional de Técnica Aeroespacial se centra en tres objetivos principalmente:
Implementación de la algoritmia experimental de determinación y control de vuelo desarrollada por el IDR en el subsistema.
Implementación de la capa de integración del subsistema ADCS en el software de vuelo del computador de a bordo del satélite.
Diseño e implementación de herramientas de procesado de telemetría del subsistema para su posterior visualización.
Estos objetivos, junto con el trabajo de los equipos de ADCS y Software permiten al ADCS integrarse satisfactoriamente con la plataforma de ANSER y cumplir sus requisitos.
Abstract:
The main objective of the ANSER missions is to coordinate three nanosatellites equipped with scientific instruments (spectrometers and panchromatic cameras) to measure the water quality of reservoirs and marshes in the Iberian Peninsula.
This thesis presents the design, validation and operation of the attitude determination and control subsystem, responsible for the relevant maneuvers to achieve formation flying and a very high accuracy and stability for the satellite payload.
The work carried out by the author during his collaboration with the ETSIInf (Technical University of Madrid) and the National Institute of Aerospace Technology focuses on three main objectives:
Implementation of the experimental algorithms for attitude determination and control developed by the IDR in the subsystem.
Implementation of the ADCS subsystem integration layer in the flight software of the satellite’s on-board computer.
Design and implementation of subsystem telemetry processing tools for subsequent visualization.
These objectives, together with the work done by the ADCS and Software teams allow the ADCS to be successfully integrated into the ANSER platform and meet its requirements
Lethal scaring - Behavioral and short-term numerical response of greylag goose Anser anser
No full textLethal scaring is one method used to alleviate crop damage by grazing geese. During lethal scaring, a few geese foraging on growing crops are shot to achieve a deterrent effect on other flock members. An additional aim is to reinforce the effects of non-lethal scaring measures. As the populations of geese increase in large parts of the world, an increased need for tools within the multifaceted area of goose management has been highlighted. Lethal scaring can potentially be one method, but currently little evidence exists about the effectiveness of the method.In this study, I tested whether grazing greylag geese Anser anser show short-term numeric and behavioral responses due to lethal scaring in targeted fields, using a Before-After-Control-Impact (BACI) study design. The study includes 26 fields with lethal scaring and 43 controls (geese were left undisturbed), where the number of birds was counted and the distance between an approaching person and the geese when all individuals have raised their heads and when they escaped were measured - before and after lethal scaring was performed.On average, 33 geese were shot per trial, which corresponds to 8.9% of the counted geese on the lethal scaring fields before the shooting occurred. The number of geese significantly decreased in the lethal scaring fields after the shooting (63% less) but were also reduced in numbers on the control fields (17% less). This result may be due to the same goose individuals using both control and lethal scaring fields, and when affected at scaring fields they choose another area or habitat for foraging; for example, in wetlands. However, the difference in the number of geese on control fields, both before and after lethal scaring, did not relate to the distance to lethal scaring fields. Moreover, birds did not seem to become more afraid of an approaching person (i.e., a non-lethal scaring tool) after the lethal scaring had been conducted (flight distance before 134 m (+/- 15.3 S.E.) and after 149 m (+/- 14.1 S.E.) in lethal scaring fields).In conclusion, this study shows that lethal scaring can substantially decrease the number of greylag geese in damage prone fields for at least three consecutive days, hence this method may also work as a tool to reduce crop losses. Practical experience from tools for alleviating crop damage is available from both Europe and North America, but very little has been published. It is therefore important to evaluate the effectiveness of the available tools under controlled conditions to increase our understanding of appropriate preventive tools and provide guidelines for stakeholders involved in the multifaceted area of goose management and crop protection. (C) 2017 The Author(s). Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/)
The effect of captivity on stress parameters in greylag geese (Anser anser)
No full textDe begeleider en/of auteur heeft geen toestemming gegeven tot het openbaar maken van de scriptie.
The supervisor and/or the author did not authorize public publication of the thesis.
Nexus Between Equity Pricing Models and Equity Price Fragility: Empirical Insights From Pakistan
No full textPurpose: The study tests conventional and behavioral pricing multifactor impact on price fragility from the equity market of Pakistan. Methodology: The positivist approach is used to deduct study rationale via probability sampling. At the same time, systematic sampling for data collection of PSX is tested in parallel to mean-variance random walk theory. Findings: The impact of conventional factors is significant on price fragility in the short run and vice versa in the long run. Specifically, herd behavior and disposition effects are found to be insignificant. But size, value, illiquidity, and price earning had a significant impact on price fragility in the short run. Limitations: The current research has not covered the desired scope of the topic due to time limitations, lack of harmony in corporate data on databases, and literature on price fragility being very scarce. Implication: In PSX, there is a need to develop a corporate culture to promote the standard modern financial practice to enhance financial productivity and sustainability. For corporate culture to be established, corporate governance boards should be established, and family governance systems should be replaced by an independent democratic board. Mispricing and arbitragers need serious control. Originality: The value of the research is that little research currently exists on about pricing multifactor impact on price fragility. Copyright © 2022 Anser, Yusop, Abbas, Ali and Ahmad.APC will be provided by the corresponding author
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