Konstanz, Univ., Diss., 2006.

Universiẗat, Diss.--Berlin, 2005.

<p>Pyrogens are substances that may induce fever in the human body. They can be parts of bacteria, virus or fungi and due to the reaction they may cause in the body, they are routinely looked for in the medical technology industries. A method called <em>in vitro</em> pyrogen test (IPT) has been developed to detect these pyrogens. It is based on the fever reaction in the human body and only requires blood in combination with a solution believed to contain pyrogens. If the result is positive, the production of cytokines is started. The cytokines of interest in the IPT method are those involved in the fever process and two of them are IL-1<em>β</em> and TNF-<em>α</em>, which are the cytokines used as markers of infection in this study. Since the production of cytokines is in proportion to the amount of pyrogens, the inflammation-inducing potential of the sample can be decided. Due to problems in standardizing the method, mainly because it handles with living blood cells, focus is still pointed at improving it. The aim of this study was to optimize parameters within the IPT method by analysing air samples taken in indoor surroundings believed to contain pyrogens. The different parameters included extraction of the filter from the air sampling, incubation of whole blood and sample extract and analysis of the incubation with ELISA (enzyme linked immunosorbent assay). More specific, some of the issues concerned extraction media, time and shaking intensity for the extraction, blood ratio for the whole blood incubation and cytokines suitable for the method.</p><p>A possible approach for the IPT method, when analysing air samples containing pyrogens, was reached.</p> / <p>Pyrogener kallas ämnen som framkallar feber och de kan exempelvis bestå av hela eller delar av bakterier, virus eller svamp (fungi). En metod som kallas för in vitro pyrogen test (IPT) har utvecklats för att detektera dessa pyrogener. Metoden bygger på att en lösning som misstänks innehålla pyrogener får komma i kontakt med blod från en människa. Efter en inkubering på mellan 4-24 timmar har blodet reagerat på eventuella pyrogener och bildat cytokiner, där mängden cytokiner är proportionell mot mängden pyrogener. De intressanta cytokinerna i den här studien var IL-1<em>β</em> och TNF-<em>α</em>, som båda är involverade i feberprocessen. Det har varit svårigheter med att standardisera metoden, mycket beroende på att det är levande celler som hela metoden bygger på, så syftet med den här studien var att förbättra in vitro pyrogen test. Luftprover tagna i inomhusmiljöer som misstänks innehålla pyrogener har använts i försöken att optimera varje steg i processen. De olika stegen inkluderade extraktion av filter som använts vid luftprovtagningen, inkubering med helblod och provextrakt och analys av inkuberingen med ELISA (enzyme linked immunosorbent assay). Några av de parametrar som undersöktes gällde extraktionsmedium, skaktid och skakintensitet under extraktionen, blodförhållande under helblodsinkuberingen och lämpliga cytokiner för metoden.</p><p>Studien resulterade i att en metodik, för att analysera luftprov innehållande pyrogener med<em> in vitro</em> pyrogen test, kunde tas fram.</p>

Zugl.: Berlin, Freie Univ., Diss., 2005 / Dateiformat: zip, Dateien im PDF-Format. - Erscheinungsjahr an der Haupttitelstelle: 2005

Universiẗat, Diss., 2007--Giessen.

Universiẗat, Diss., 2007--Giessen.

Thesis (doctoral)--Universität Konstanz, 2005.

Freie Universiẗat, Diss., 2005--Berlin. / Dateiformat: zip, Dateien im PDF-Format. Erscheinungsjahr an der Haupttitelstelle: 2005.

Pyrogens are substances that may induce fever in the human body. They can be parts of bacteria, virus or fungi and due to the reaction they may cause in the body, they are routinely looked for in the medical technology industries. A method called in vitro pyrogen test (IPT) has been developed to detect these pyrogens. It is based on the fever reaction in the human body and only requires blood in combination with a solution believed to contain pyrogens. If the result is positive, the production of cytokines is started. The cytokines of interest in the IPT method are those involved in the fever process and two of them are IL-1β and TNF-α, which are the cytokines used as markers of infection in this study. Since the production of cytokines is in proportion to the amount of pyrogens, the inflammation-inducing potential of the sample can be decided. Due to problems in standardizing the method, mainly because it handles with living blood cells, focus is still pointed at improving it. The aim of this study was to optimize parameters within the IPT method by analysing air samples taken in indoor surroundings believed to contain pyrogens. The different parameters included extraction of the filter from the air sampling, incubation of whole blood and sample extract and analysis of the incubation with ELISA (enzyme linked immunosorbent assay). More specific, some of the issues concerned extraction media, time and shaking intensity for the extraction, blood ratio for the whole blood incubation and cytokines suitable for the method. A possible approach for the IPT method, when analysing air samples containing pyrogens, was reached. / Pyrogener kallas ämnen som framkallar feber och de kan exempelvis bestå av hela eller delar av bakterier, virus eller svamp (fungi). En metod som kallas för in vitro pyrogen test (IPT) har utvecklats för att detektera dessa pyrogener. Metoden bygger på att en lösning som misstänks innehålla pyrogener får komma i kontakt med blod från en människa. Efter en inkubering på mellan 4-24 timmar har blodet reagerat på eventuella pyrogener och bildat cytokiner, där mängden cytokiner är proportionell mot mängden pyrogener. De intressanta cytokinerna i den här studien var IL-1β och TNF-α, som båda är involverade i feberprocessen. Det har varit svårigheter med att standardisera metoden, mycket beroende på att det är levande celler som hela metoden bygger på, så syftet med den här studien var att förbättra in vitro pyrogen test. Luftprover tagna i inomhusmiljöer som misstänks innehålla pyrogener har använts i försöken att optimera varje steg i processen. De olika stegen inkluderade extraktion av filter som använts vid luftprovtagningen, inkubering med helblod och provextrakt och analys av inkuberingen med ELISA (enzyme linked immunosorbent assay). Några av de parametrar som undersöktes gällde extraktionsmedium, skaktid och skakintensitet under extraktionen, blodförhållande under helblodsinkuberingen och lämpliga cytokiner för metoden. Studien resulterade i att en metodik, för att analysera luftprov innehållande pyrogener med in vitro pyrogen test, kunde tas fram.

Behavioral fever is an essential coping mechanism across ectothermic phyla to aid in combating pathogenic threats. Ectotherms lack internal temperature regulation associated with fever in endotherms; thus, ectotherms can exhibit a behavioral fever response when immunocompromised to thermoregulate by moving to warmer locations. The salamander order Caudata, tend to be keystone species in their resident ecosystems through their role as secondary consumers of invertebrates to maintain the food chain. With growing interest about ecology and conservation of salamanders as species diversity declines, this study was designed to determine if salamanders use their environment to take advantage of behavioral fever. The lungless salamander, Plethodon glutinosus, was used to investigate behavioral fever through exposure to the synthetic viral pyrogen polyinosinic:polycytidylic acid (Poly (I:C)) at doses of 15 µg/g by live wet weight. After 24 hours, the induced fever specimens were placed in a linear temperature gradient with a controlled humidity of 95% throughout. Average temperature preferences were then monitored over a 12-hour period and resulted in control animals preferring cold and moderate temperatures between 15-19 °C while all poly (I:C) injected animals preferred higher temperatures from 19-21°C (p<<0.0001). This result supports that P. glutinous responds to immunocompromising threats such as presented by synthetic viral pyrogen Poly (I:C) through use of behavioral fever.