Future emission legislation puts great emphasis on increasing the efficiency of the engine, thereby reducing fuel consumption. The tribological contact between cylinder liner and piston ring is where an great amount of energy is lost due to friction, and by reducing these losses an reduction in fuel consumption can be achieved.The aim of this thesis was to evaluate the tested piston ring coatings against a plasma sprayed cylinder liner and rank these combinations of materials for friction and wear resistance. The coatings that were tested was Cr + Al2O3, (Al,Cr)N, two types of CrN and WC / C.The experimental tests were performed with a so-called pin-plate, where used oil with addition of an acidic mixture of sulfuric and nitric acid to mimic the acidic condensate formed when exhausts recirculate, were added with a continuous flow. The results were then analyzed by weighing, studies by optical microscopy and scanning electron microscopy (SEM) and profile measurements.The results from each material combination were that the plasma coated cylinder liner wears too aggressively in order to yield a ranking of the piston ring coatings based on the parameters of friction and wear resistance. It is therefore proposed that an alternative coating on the cylinder liner should be developed, lacking the large abrasive wear on piston rings and that can withstand the corrosive environment resulting in engines equipped with EGR.

To investigate effects of nitrogen on in-lake CO2 and CH4 production during winter, three pair of lakes was subject for a fertilizing experiment in which one lake in each pair was fertilized with nitric acid (HNO3) directly into the water column in the summer of 2012. The lakes in each pair are assumed to be morphologically, hydrologically and biologically similar, that is, the non-fertilized lakes are considered references. The pairs do differ in one major way by being progressively less humic, going from around 25 mg/l to 10 mg/l DOC. Sampling and analysis was carried out at the end of the frozen period in 2013. Results show a significantly higher concentration of both CO2 (p<0,001) and CH4 (?=0,1, p=0,053) between impact and reference sites in the two less humic pairs.

På histopatologiska laboratoriet vid Länssjukhuset Ryhov i Jönköping är dehydreringsprocessen i dagsläget förlagd över natt. För upprätthållande av god kvalitet på diagnos med förbättrat provflöde och utnyttjande av instrumentens fulla kapacitet önskas att ett kortare dehydreringsprogram implementeras och förläggs dagtid. Syftet med denna studie var således att utvärdera ett kortare dehydreringsprogram för stansbiopsier från human hud och portio. Detta har gjorts utifrån cellmorfologiska bedömningsgrunder och bedömning av färgkvalité av rutinfärgning med Hematoxylin och Eosin samt specialfärgningarna polykrommetylenblått enligt Unna, Periodic acid-Schiff och Giemsa. Ett material om 87 biopsier från human hud samt portio dehydrerades fördelat över gällande rutinprogram samt utvärderat kortprogram.

På histopatologiska laboratoriet vid Länssjukhuset Ryhov i Jönköping är dehydreringsprocessen i dagsläget förlagd över natt. För upprätthållande av god kvalitet på diagnos med förbättrat provflöde och utnyttjande av instrumentens fulla kapacitet önskas att ett kortare dehydreringsprogram implementeras och förläggs dagtid. Syftet med denna studie var således att utvärdera ett kortare dehydreringsprogram för stansbiopsier från human hud och portio. Detta har gjorts utifrån cellmorfologiska bedömningsgrunder och bedömning av färgkvalité av rutinfärgning med Hematoxylin och Eosin samt specialfärgningarna polykrommetylenblått enligt Unna, Periodic acid-Schiff och Giemsa. Ett material om 87 biopsier från human hud samt portio dehydrerades fördelat över gällande rutinprogram samt utvärderat kortprogram.

På histopatologiska laboratoriet vid Länssjukhuset Ryhov i Jönköping är dehydreringsprocessen i dagsläget förlagd över natt. För upprätthållande av god kvalitet på diagnos med förbättrat provflöde och utnyttjande av instrumentens fulla kapacitet önskas att ett kortare dehydreringsprogram implementeras och förläggs dagtid. Syftet med denna studie var således att utvärdera ett kortare dehydreringsprogram för stansbiopsier från human hud och portio. Detta har gjorts utifrån cellmorfologiska bedömningsgrunder och bedömning av färgkvalité av rutinfärgning med Hematoxylin och Eosin samt specialfärgningarna polykrommetylenblått enligt Unna, Periodic acid-Schiff och Giemsa. Ett material om 87 biopsier från human hud samt portio dehydrerades fördelat över gällande rutinprogram samt utvärderat kortprogram.

På histopatologiska laboratoriet vid Länssjukhuset Ryhov i Jönköping är dehydreringsprocessen i dagsläget förlagd över natt. För upprätthållande av god kvalitet på diagnos med förbättrat provflöde och utnyttjande av instrumentens fulla kapacitet önskas att ett kortare dehydreringsprogram implementeras och förläggs dagtid. Syftet med denna studie var således att utvärdera ett kortare dehydreringsprogram för stansbiopsier från human hud och portio. Detta har gjorts utifrån cellmorfologiska bedömningsgrunder och bedömning av färgkvalité av rutinfärgning med Hematoxylin och Eosin samt specialfärgningarna polykrommetylenblått enligt Unna, Periodic acid-Schiff och Giemsa. Ett material om 87 biopsier från human hud samt portio dehydrerades fördelat över gällande rutinprogram samt utvärderat kortprogram.

Future emission legislation puts great emphasis on increasing the efficiency of the engine, thereby reducing fuel consumption. The tribological contact between cylinder liner and piston ring is where an great amount of energy is lost due to friction, and by reducing these losses an reduction in fuel consumption can be achieved.The aim of this thesis was to evaluate the tested piston ring coatings against a plasma sprayed cylinder liner and rank these combinations of materials for friction and wear resistance. The coatings that were tested was Cr + Al2O3, (Al,Cr)N, two types of CrN and WC / C.The experimental tests were performed with a so-called pin-plate, where used oil with addition of an acidic mixture of sulfuric and nitric acid to mimic the acidic condensate formed when exhausts recirculate, were added with a continuous flow. The results were then analyzed by weighing, studies by optical microscopy and scanning electron microscopy (SEM) and profile measurements.The results from each material combination were that the plasma coated cylinder liner wears too aggressively in order to yield a ranking of the piston ring coatings based on the parameters of friction and wear resistance. It is therefore proposed that an alternative coating on the cylinder liner should be developed, lacking the large abrasive wear on piston rings and that can withstand the corrosive environment resulting in engines equipped with EGR.

The dairy cow?s ability to resume estrus after calving and to conceive is affected by their metabolic status after calving. For high yielding cows there is a high risk that the feed intake will not be sufficient to cope with the increased energy demands after calving, and the cow will end up in a state of negative energy balance. Energy balance can be measured in various ways, for example by body condition score or by plasma concentration of several metabolic hormones and metabolites. After calving, endocrine pathways stimulate tissue mobilization; insulin signaling is blocked, the concentration of insulin-like growth factor-1(IGF-1) and leptin decreases, and the concentration of growth hormone (GH) increases.

Abstract.The levels of dioxin and comparable substances rose to a large extent in our environment during the second half of the 20'Th century. This was the result of the synthesis of, and careless usage of these substances in cooling fluids, hydraulics, pesticides etc. Background levels of dioxins and furans in sealed samples prior to this era suggest that former sources of these substances existed. Salt glazing is a method of adding a smooth acid resistant exterior to stoneware ceramics. The technique has been in use since the 16'Th century, maybe even earlier than that.

Abstract.The levels of dioxin and comparable substances rose to a large extent in our environment during the second half of the 20'Th century. This was the result of the synthesis of, and careless usage of these substances in cooling fluids, hydraulics, pesticides etc. Background levels of dioxins and furans in sealed samples prior to this era suggest that former sources of these substances existed. Salt glazing is a method of adding a smooth acid resistant exterior to stoneware ceramics. The technique has been in use since the 16'Th century, maybe even earlier than that.

The term euthanasia is derived from the Greek terms eu meaning good and thanatos meaning death, "good death". The penetrating captive bolt is an effective method of euthanasia, when use of drugs is inappropriate. The horse becomes immediately unconscious and falls to the ground. First after the blood is emptied from the body the horse is dead. The use of injectable euthanasia agents is a rapid and reliable method of performing euthanasia. The aim is to stop the flow of oxygenated blood to vital organs and tissues. The muscle relaxants may be used either in combination wih or following an anaesthetic dose of barbiturate, their use use as a sole agent is totally inhumane.

Gene technology has become more and more attractive in plant breeding during the last twenty years. This is probably because it can readily improve the existing commercial cultivars that have only one or a few drawbacks by modifying one or a few genes without changing the main genetic constitution. In this regard, gene technology is more effective than conventional breeding.The aim of this project was to analyze the fruit quality of the non-transgenic apple scion ?Jonagold? grafted on non-transgenic and rolB-transgenic apple rootstocks. The rootstocks used were M9-rolB1, M9-rolB2, M26-rolB and non-transgenic controls M9 and M26.

The aims of the study were to investigate the prevalence and antibiotic resistance of Campylobacter jejuni and Campylobacter coli in chicken and chicken products, and to investigate farmer awareness of antibiotic resistance development. The study was conducted in the Can Tho province in Vietnam during six weeks in October to November 2008. Ninety-six samples from raw chickens were collected from twelve market places and analysed for the presence of Campylobacter. A total of 96 cloacal swabs from 20 farms were obtained and analysed for the presence of Campylobacter. Farmers were asked to answer eight questions concerning the housing of the chickens, modes of handling sick animals as well as use and knowledge of antibiotics and resistance development to antibiotics.

SAMMANFATTNING Mitt examensarbete utgör ett led i Nordiska Genbankens (NGB) uppgift att skapa en nordisk s.k. ?core collection? av rabarber, Rheum rhabarbarum L. Samlingar finns även i våra nordiska grannländer Norge, Finland, Danmark och Island. I Sverige har ett insamlingsarbete av rabarber pågått under åren 2002 och 2003 för att komplettera en äldre samling.

In two feeding experiments Bacillus induced priming of plant defense was tested for its effect against the generalist insect pest Spodoptera littoralis. The main hypothesis for the study was that Bacillus induced priming would enable the plant Arabidopsis thaliana to defend itself better against this insect herbivore since this priming seems to involve jasmonic acid, known to be important for plant defense to insects. A secondary objective of the study was to examine if any differences in a primed defense capability could be seen between different natural genetic variants (ecotypes) of A. thaliana reflecting habitat differences in pest pressure. The methods used for plant cultivation and Bacillus inoculation were aimed at reflecting conditions that can be expected in an agricultural cropping system. This meant that all plants were cultivated in soil, and the feeding experiments were conducted with the plants growing intact in the soil system.