3 resultados para Comprimento de onda

em Helda - Digital Repository of University of Helsinki


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Background. Cardiovascular disease (CVD) remains the most serious threat to life and health in industrialized countries. Atherosclerosis is the main underlying pathology associated with CVD, in particular coronary artery disease (CAD), ischaemic stroke, and peripheral arterial disease. Risk factors play an important role in initiating and accelerating the complex process of atherosclerosis. Most studies of risk factors have focused on the presence or absence of clinically defined CVD. Less is known about the determinants of the severity and extent of atherosclerosis in symptomatic patients. Aims. To clarify the association between coronary and carotid artery atherosclerosis, and to study the determinants associated with these abnormalities with special regard to novel cardiovascular risk factors. Subjects and methods. Quantitative coronary angiography (QCA) and B-mode ultrasound were used to assess coronary and carotid artery atherosclerosis in 108 patients with clinically suspected CAD referred for elective coronary angiography. To evaluate anatomic severity and extent of CAD, several QCA parameters were incorporated into indexes. These measurements reflected CAD severity, extent, and overall atheroma burden and were calculated for the entire coronary tree and separately for different coronary segments (i.e., left main, proximal, mid, and distal segments). Maximum and mean intima-media thickness (IMT) values of carotid arteries were measured and expressed as mean aggregate values. Furthermore, the study design included extensive fasting blood samples, oral glucose tolerance test, and an oral fat-load test to be performed in each participant. Results. Maximum and mean IMT values were significantly correlated with CAD severity, extent, and atheroma burden. There was heterogeneity in associations between IMT and CAD indexes according to anatomical location of CAD. Maximum and mean IMT values, respectively, were correlated with QCA indexes for mid and distal segments but not with the proximal segments of coronary vessels. The values of paraoxonase-1 (PON1) activity and concentration, respectively, were lower in subjects with significant CAD and there was a significant relationship between PON1 activity and concentration and coronary atherosclerosis assessed by QCA. PON1 activity was a significant determinant of severity of CAD independently of HDL cholesterol. Neither PON1 activity nor concentration was associated with carotid IMT. The concentration of triglycerides (TGs), triglyceride-rich lipoproteins (TRLs), oxidized LDL (oxLDL), and the cholesterol content of remnant lipoprotein particle (RLP-C) were significantly increased at 6 hours after intake of an oral fatty meal as compared with fasting values. The mean peak size of LDL remained unchanged 6 hours after the test meal. The correlations between total TGs, TRLs, and RLP-C in fasting and postprandial state were highly significant. RLP-C correlated with oxLDL both in fasting and in fed state and inversely with LDL size. In multivariate analysis oxLDL was a determinant of severity and extent of CAD. Neither total TGs, TRLs, oxLDL, nor LDL size were linked to carotid atherosclerosis. Insulin resistance (IR) was associated with an increased severity and extent of coronary atherosclerosis and seemed to be a stronger predictor of coronary atherosclerosis in the distal parts of the coronary tree than in the proximal and mid parts. In the multivariate analysis IR was a significant predictor of the severity of CAD. IR did not correlate with carotid IMT. Maximum and mean carotid IMT were higher in patients with the apoE4 phenotype compared with subjects with the apoE3 phenotype. Likewise, patients with the apoE4 phenotype had a more severe and extensive CAD than individuals with the apoE3 phenotype. Conclusions. 1) There is an association between carotid IMT and the severity and extent of CAD. Carotid IMT seems to be a weaker predictor of coronary atherosclerosis in the proximal parts of the coronary tree than in the mid and distal parts. 2) PON1 activity has an important role in the pathogenesis of coronary atherosclerosis. More importantly, the study illustrates how the protective role of HDL could be modulated by its components such that equivalent serum concentrations of HDL cholesterol may not equate with an equivalent, potential protective capacity. 3) RLP-C in the fasting state is a good marker of postprandial TRLs. Circulating oxLDL increases in CAD patients postprandially. The highly significant positive correlation between postprandial TRLs and postprandial oxLDL suggests that the postprandial state creates oxidative stress. Our findings emphasize the fundamental role of LDL oxidation in the development of atherosclerosis even after inclusion of conventional CAD risk factors. 4) Disturbances in glucose metabolism are crucial in the pathogenesis of coronary atherosclerosis. In fact, subjects with IR are comparable with diabetic subjects in terms of severity and extent of CAD. 5) ApoE polymorphism is involved in the susceptibility to both carotid and coronary atherosclerosis.

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This thesis treats Githa Hariharan s first three novels The Thousand Faces of Night (1992), The Ghosts of Vasu Master (1994) and When Dreams Travel (1999) as a trilogy, in which Hariharan studies the effects of storytelling from different perspectives. The thesis examines the relationship between embedded storytelling and the primary narrative level, the impact of character-bound storytelling on personal development and interpersonal relationships. Thus, I assume that an analysis of the instabilities between characters, and tensions between sets of values introduced through storytelling displays the development of the central characters in the novels. My focus is on the tensions between different sets of values and knowledge systems and their impact on the gender negotiations. The tensions are articulated through a resistance and/or adherence to a cultural narrative, that is, a formula, which underlies specific narratives. Conveyed or disputed by embedded storytelling, the cultural narrative circumscribes what it means to be gendered in Hariharan s novels. The analysis centres on how the narratee in The Thousand Faces of Night and the storyteller in The Ghosts of Vasu Master relate to and are affected by the storytelling, and how they perceive their gendered positions. The analysis of the third novel When Dreams Travel focuses on storytelling, and its relationship to power and representation. I argue that Hariharan's use of embedded storytelling is a way to renegotiate and even reconceptualise gender. Hariharan s primary concern in all three novels is the tensions between tradition or repetition, and change, and how they affect gender. Although the novels feature ancient mythical heroes, mice and flies, or are set in a fantasy world of jinnis and ghouls, they are, I argue, deeply concerned with contemporary issues. Whereas the first novel questions the demands set by family and society on the individual, the second strives to articulate an ethical relationship between the self and the other. The third novel examines the relationship between representation and power. These issues could not be more contemporary, and they loom large over both the regional and global arenas.

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Syftet med studien är att undersöka sydfinlandssvenska högskolestuderandes kännedom om och inställning till ett urval finlandssvenska ord och uttryck samt till dessa ords allmänsvenska motsvarigheter. För att undersöka detta har jag gjort en enkätundersökning bland svenskspråkiga högskolestuderande i Helsingfors. Jag undersöker i vilken utsträckning informanterna använder finlandssvenska ord och uttryck och i vilken utsträckning allmänsvenska. Jag undersöker även vilka finlandssvenska ord och uttryck de använder mest och vilka minst, samt vilka allmänsvenska ord och uttryck de använder mest och vilka minst. Dessutom undersöker jag om informanternas språkliga bakgrund har ett samband med deras kännedom om och användning av finlandssvenska respektive allmänsvenska ord och uttryck. Avsikten med den här undersökningen är att öka kunskapen om hur unga finlandssvenskar förhåller sig till sin finlandssvenska varietet samt till den allmänsvenska varieteten som de i vuxen ålder förutsätts behärska åtminstone i någon mån. Idén till enkätundersökningen kommer från Margareta Södergårds och Sofie Tjärus studie Blivande barnträdgårdslärares syn på finlandismer (2008). Urvalet finlandismer kommer från en mindre undersökning Goda och onda finlandismer som Mikael Reuter (2004) har gjort bland en grupp finlandssvenska och sverigesvenska språkvårdare. Sammanlagt ingår 55 finlandismer av olika slag i enkäten. För varje finlandism finns det även en eller fler allmänsvenska motsvarigheter och sammanlagt ingår därför 122 ord och uttryck i enkäten. Mina informanter är 162 studerande vid två svenska högskolor i Helsingfors. För att få reda på relevanta bakgrundsfakta om informanterna har jag använt samma formulär som Therese Leinonen i Svenskan i Finland ett språk i kläm? (Leinonen & Tandefelt 2000). Jag har utgående från informanternas generella språkanvändning delat in dem i tre grupper. En grupp vars vardag är finskdominerad, en vars vardag är svenskdominerad och en vars vardag utspelar sig till ungefär lika stor del på svenska som på finska. Undersökningen är kvantitativ och för att behandla materialet har statistikprogrammet SPSS använts. Studien visar att informanterna förhåller sig rätt lika till finlandismerna och de allmänsvenska orden och uttrycken. De känner ungefär lika bra till de finlandssvenska och de allmänsvenska orden och uttrycken, men de prefererar ändå i viss mån finlandismerna framför de allmänsvenska orden och uttrycken. Mina informanter förefaller i viss mån vara mer accepterande mot finskpåverkade finlandismer än vad Reuters (2004) informanter är, och de förhåller sig mindre positiva till metaforiska uttryck än vad Reuters informanter gör. Informanter med en svenskspråkig vardag verkar använda allmänsvenska ord och uttryck i högre utsträckning än vad informanterna med en finskspråkig vardag gör. Resultaten tyder dessutom på att informanterna med en svenskspråkig vardag också känner till fler allmänsvenska ord och uttryck även om de inte alltid själva är beredda att använda dem. Studien visar även att informanter med en svenskspråkig vardag använder en del metaforiska uttryck mer än vad informanterna med en finskspråkig vardag gör. Det är överlag tydligt att undersökningens informanter, finlandssvenska högskolestuderande från södra Finland, varken har en speciellt stor kännedom om metaforiska uttryck eller en speciellt positiv inställning till dessa. Bristande behärskning av metaforiska uttryck, idiom och kollokationer kan ses som ett första steg mot språkförlust och sett ur den synvinkeln är resultatet oroväckande. Det stärker den rådande uppfattningen att allt inte står helt rätt till med den svenska språkbehärskningen bland unga finlandssvenskar.