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6 Uppsatser om CASA - Sida 1 av 1

Utvärdering av förbättrad metod för objektiv kvalitetsbedömning av spermiemotilitet hos hingst :

In this trial we used QualispermTM as an objective method of measuring stallion semen. Samples of semen were analyzed before and after centrifugation. Motility and concentration were statistically analyzed. During the trial all the objective mesaurments were compared to a subjective method. The advantages of QualispermTM compared to older CASA- systems is it´s ability of measuring a greater amount of spermatozoa while it also grades them into different subpopulations. These subpopulations have different qualities that decides their capacity of fertilization. The results showed that this objective method might be used practically. Although, there are still some disadvantages, such as high costs and the necessarity of accurat training of the handler. If it´s possible to prove further relevant results that also are statistically correct, this could prove the usefulness of QualispermTM as an objective measurment method in the daily work at gestuts and stallion stations, thus giving the staff a reliable instrument in assisting the work for an improved horse breeding in Sweden, improving both in quality and economically..

Bedömning av spermiemotilitet i färsk, kyld samt selekterad hingstsperma med Qualisperm :

This EEF-project is a part of a larger project at SLU, Division of Reproduction, Dept of Clinical Science, with the intention of developing and evaluating new methods for the assessment of stallion semen quality. Over the last 10 years there has been an increase in the use of artificial insemination with cooled semen in Swedish horse breeding. At the same time, foaling rates have decreased. This has lead to a need for new and better methods of assessing the quality of stallion semen. This EEF-project was based on an objective method to calculate motility, with QualispermTM, in fresh and cooled stallion semen, and after selection. Today sperm motility evaluation is mainly done subjectively by visual assessment with a light microscope, and the correlation between these motility results and fertility have varied.

Är vi artiga mot virtuella agenter?

The CASA-paradigm, Computers Are Social Actors, was introduced in the book "TheMedia Equation" by Reeves and Nass. One of their experiments concluded that we tend to be polite to computers in the same way as we are to people. In this study I have replicated Reeves and Nass experiment but instead of a text-based interface I have used a virtual agentin order to find out if we are polite to the agents, or still to the computer. Two experimental setups was conducted. The two setups had a common first part that was carried out on onecomputer with one agent.

Effekter av spädningsvätska på motilitet och fertilitet hos hingstsperma : en jämförelse av subjektiv motilitetsbedömning och QualispermTM

At SLU, Divison of Reproduction, Dept of Clinical Science, there is an ongoing project on the development and evaluation of new methods for the assessment of stallion semen quality. This EEF-study, which is a part of that larger project, has focused on the effects on motility and fertility of stallion semen of two different extenders and selection. Both an objective method and a subjective method for analysis have been used and compared in the study. The increase in the use of artificial insemination with cooled semen in Swedish horse breeding over the last decade is thought to play a part in declining foaling rates (Kareskoski et al, 2006, Kuisma et al, 2006). This calls for better evaluation methods of semen quality since cooling and transportation put higher demands on semen quality in order to maintain fertility (Aurich, 2005).

Hundertwassers arkitektur : att vara eller inte vara

Föreliggande uppsats studerar Friedensreich Hundertwassers (1928-2000) organiska/vegetativaarkitektur, begränsad till utvalda signifikativa arkitekturelement på fyra olika bildnivåer, frånöversiktsbild till en avgränsad del av ett mindre utrymme. Den byggnad som avses är kvarteretDie Grüne Zitadelle i Magdeburg, Tyskland. Uppsatsen är tudelad i den meningen att den utgårifrån nämnd arkitektur och analyseras/syntetiseras enligt Erwin Panofskys ikonologiska metod. Urdenna första analys framvaskas relevanta dikotomier, en metod som i sin ursprungliga form ärHeinrich Wölfflins komparativa. Dock jämförs inte Hundertwassers verk genom epokskiljandestilfaktorer, utan genom jämförande med en konstnär som enligt tidigare forskning anses varanärliggande Hundertwasser.

Olika protokoll vid upptining av tjursperma : effekt på spermans kvalitet och temperatur

Artificiell insemination (AI) har revolutionerat reproduktionen och husdjursaveln sedan den första inseminationen gjordes 1784. När man 1949 upptäckte att spermier kunde överleva djupfrysning och upptining underlättades AI-arbetet ytterligare. Ett lyckat resultat vid användningen av AI bygger på att alla delar i den kedja av händelser fungerar från samling av sperma till insemination. En kritisk länk i kedjan är själva handhavandet av sperman vid upptining och laddning av payetten i pistoletten i samband med inseminationen. Hur upptiningsprotokollet ser ut varierar dock mellan olika länder och instruktionerna saknar ofta vetenskapliga referenser.