996 resultados para radical media


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Tässä väitöskirjassa tarkastellaan suomalaisen puoluejohtajuuden ja suuren puolueen johtajaksi nousun murroskautta 1980-luvun lopulta 2010-luvulle median ja politiikan vuorovaikutuksen näkökulmasta. Puolueiden johtaminen on myös Suomessa ollut miesten työtä, ja perinteisesti tehtävään on ollut yksi väylä: asettuminen ehdolle puheenjohtajavaalissa ja valituksi tulo puoluekokouksessa. Tarkastelujakson alkupuolella naisia oli Suomessa ensimmäistä kertaa ehdolla suurten puolueiden puheenjohtajavaaleissa. Kauden loppupuolella heitä myös valittiin tuohon tehtävään ja ensimmäiset naiset nousivat pääministeriksi. Tämä historiallinen murros päätti liki satavuotisen perinteen, jossa miehet ovat olleet Suomessa sekä suurten puolueiden että hallitustyön johtajia. Julkisessa keskustelussa kysymys tasa-arvosta jäi toissijaiseksi: naisia alettiin valita puoluejohtajiksi tilanteissa, joissa heidän valintansa nähtiin puolueille edulliseksi. Naisen valinta tulkittiin miehen valintaa merkittävämmäksi symboliseksi viestiksi, johon liitettiin ajatuksia uudistumisesta ja puolueen julkisuuskuvan parantamisesta. Merkille pantavaa on, että naisten ensimmäiset valinnat suurten puolueiden johtajiksi tapahtuivat vaiheessa, jossa puoluejohtajien valta-asema on vahvin kautta suomalaisen poliittisen historian. Tässä valossa näyttää siltä, että valta ei aina pakenekaan naisilta. Vaikka suomalainen yhteiskunta ja suomalaiset naiset ovat monessa mielessä olleet edelläkävijöitä tasa-arvon suhteen, politiikan johtopaikkoja tavoitelleet naiset ovat meilläkin kohdanneet kansainvälisessä tutkimuksessa naisten haasteeksi osoitettuja lasikattoja, pyöröovia ja liukkaita jyrkänteitä. Tutkittavan ajanjakson aikana konkretisoitui myös toinen mahdollinen, joskin poikkeuksellinen reitti suuren puolueen johtajaksi: pienen puolueen nouseminen suurten joukkoon eduskuntavaaleissa. Tämä vaihtoehto toteutui vuonna 2011 perussuomalaisten eduskuntavaalivoiton myötä. Perussuomalaisten nousu eduskunnan pienimmästä puolueesta kolmanneksi suurimmaksi mursi perinteisen kolmen suuren puolueen asetelman. Puolueen menestyksen seuraukset ovat olleet kauaskantoisemmat kuin ehkä ensin ajateltiin: perussuomalaisten vaalivoiton sosiaalidemokraateille, keskustalle, ja kokoomukselle aiheuttama järkytys heijastui myöhemmin myös niiden johtajavaihdoksiin ja -valintoihin. Sekä naisten läpimurrossa että populismin voittokulussa median rooli oli monisyisempi kuin siihen perinteisesti liitetty tiedon välittäjän ja valtaa pitävien toimia kriittisesti seuraavan neljännen valtiomahdin tehtävänkuva. Tutkittavalla jaksolla tiedotusvälineet tekivät onnistuneen intervention politiikan osapuoleksi. Toimittajat ottivat kantaa valintoihin ja ohjeistivat puolueita, ja puolueet taas mukauttivat näkyvyyden maksimoidakseen käytäntöjään median tarpeisiin. 1980-luvun lopulta 2010-luvulle ulottuvalla jaksolla suuren puolueen puoluejohtajaksi valikoitumisen kriteerit muuttuivat, samalla kun median merkitys johtajavalinnoissa ja myös puoluejohtajan käytännön työssä kasvoi. Mediasta tuli aiempaa konkreettisemmin johtajavalintojen ja valtakamppailun areena, ja siihen liittyvät näkökohdat nousivat myös keskeisiksi johtajan taitoja arvioitaessa. Kuka ehdokkaista toisi näkyvyyttä, ”pärjäisi” median paineissa ja vakuuttaisi äänestäjät? Vielä 1980- ja 1990-lukujen taitteessa johtajavalinnat olivat pitkälti puolueorganisaatioiden hallinnoimia prosesseja, joista lehdistö raportoi askeleen jäljessä kulkien. Viimeistään 2000-luvun ensimmäisellä vuosikymmenellä puolueet omaksuivat ajatuksen median hyödyllisyydestä. Tämän strategisen muutoksen myötä puolueet tulivat samalla luovuttaneeksi määriteltyvaltaa oman organisaationsa ulkopuolelle. Kokoomuksen vuoden 2014 johtajavaalissa silmiinpistävää oli pyrkimys sekä hyötyä julkisuudesta että palauttaa valtaa takaisin puolueelle. Politiikan mediajulkisuuden alttius tarttua myyviin poliitikkopersooniin, ilmiöihin, ristiriitoihin ja draamaan sekä vastaavasti populistijohtaja Timo Soinin ja perussuomalaisten kyky tarjota kaikkia näitä auttoivat puolueen suurvoittoon vuoden 2011 eduskuntavaaleissa. Organisaatioltaan pieni ja johtajaansa henkilöityvä puolue sai selvästi poliittista painoarvoaan suuremman julkisuuden, koska kiinnostavuus määritti näkyvyyden ja puolueen nousevasta kannatuksesta tuli yksi vaalien pääaiheista. Median ja politiikan suhteessa tapahtuneet muutokset olivat vauhdittamassa niin naisten nousua suurten puolueiden johtajiksi kuin populistisen johtajuuden läpimurtoa ja perussuomalaisten menestystä. Koska suurten puolueiden johtajista valikoituvat myös pääministerit, näiden muutosten vaikutus ulottuu Suomen poliittisesti vaikutusvaltaisimpaan tehtävään asti.

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Methylated arginine analogues are often used as probes of the effect of nitric oxide; however, their specificity is unclear and seems to be frequently overestimated. This study analyzed the effects of NG-methyl-L-arginine (L-NMMA) on the endothelium-dependent release of vascular superoxide radicals triggered by increased flow. Plasma ascorbyl radical signals measured by direct electron paramagnetic resonance spectroscopy in 25 rabbits increased by 3.8 ± 0.7 nmol/l vs baseline (28.7 ± 1.4 nmol/l, P<0.001) in response to papaverine-induced flow increases of 121 ± 12%. In contrast, after similar papaverine-induced flow increases simultaneously with L-NMMA infusions, ascorbyl levels were not significantly changed compared to baseline. Similar results were obtained in isolated rabbit aortas perfused ex vivo with the spin trap a-phenyl-N-tert-butylnitrone (N = 22). However, in both preparations, this complete blockade was not reversed by co-infusion of excess L-arginine and was also obtained by N-methyl-D-arginine, thus indicating that it is not related to nitric oxide synthase. L-arginine alone was ineffective, as previously demonstrated for NG-methyl-L-arginine ester (L-NAME). In vitro, neither L-arginine nor its analogues scavenged superoxide radicals. This nonspecific activity of methylated arginine analogues underscores the need for careful controls in order to assess nitric oxide effects, particularly those related to interactions with active oxygen species.

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Achyrocline satureioides (Lam.) DC. (Compositae) is a medicinal herb used in Argentina, Uruguay, Brazil and Paraguay for its choleretic, antispasmodic and hepatoprotective properties. The presence of the flavonoid quercetin and its derivatives, and of different phenolic acids such as caffeic, chlorogenic and isochlorogenic acids in the aerial parts of this plant has led us to study the antioxidant activity of its extracts using different bioassays. The inhibition of luminol-enhanced chemiluminescence by the aqueous and methanolic extracts was used to show that their total reactive antioxidant potential index (TRAP; in µM Trolox equivalents) was 91.0 ± 15.4 and 128.1 ± 20.1 µM, respectively, while the total antioxidant reactivity index (TAR) was calculated to be 1537 ± 148 and 1910 ± 171 µM. Only the methanolic extract was capable of reducing iron (II)-dependent DNA damage. Lipid peroxidation was assessed by two different methods. The aqueous extract reduced hydroperoxide-initiated chemiluminescence in rat liver homogenates at all concentrations in a dose-dependent manner, with a calculated IC50 = 225 µg/ml, while the methanolic extract was only effective at higher concentrations (100 and 1000 µg/ml). Both aqueous and methanolic extracts were capable of reducing the production of thiobarbituric acid reactive substances (TBARS) in rat liver homogenates, with an IC50 >1000 µg/ml. The results obtained suggest that the extracts of A. satureioides possess significant free radical scavenging and antioxidant activity in vitro, a fact that should encourage future in vivo studies.

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The aim of this study was to analyze the thickness of the intima-media complex (IMC) using a noninvasive method. The carotid and femoral common arteries were evaluated by noninvasive B-mode ultrasound in 63 normotensive and in 52 hypertensive subjects and the thickness of the IMC was tested for correlation with blood pressure, cardiac structures and several clinical and biological parameters. The IMC was thicker in hypertensive than in normotensive subjects (0.67 ± 0.13 and 0.62 ± 0.16 vs 0.54 ± 0.09 and 0.52 ± 0.11 mm, respectively, P<0.0001). In normotensive patients, the simple linear regression showed significant correlations between IMC and age, body mass index and 24-h systolic blood pressure for both the carotid and femoral arteries. In hypertensives the carotid IMC was correlated with age and 24-h systolic blood pressure while femoral IMC was correlated only with 24-h diastolic blood pressure. Forward stepwise regression showed that age, body mass index and 24-h systolic blood pressure influenced the carotid IMC relationship (r2 = 0.39) in normotensives. On the other hand, the femoral IMC relationship was influenced by 24-h systolic blood pressure and age (r2 = 0.40). In hypertensives, age and 24-h systolic blood pressure were the most important determinants of carotid IMC (r2 = 0.37), while femoral IMC was influenced only by 24-h diastolic blood pressure (r2 = 0.10). There was an association between carotid IMC and echocardiographic findings in normotensives, while in hypertensives only the left posterior wall and interventricular septum were associated with femoral IMC. We conclude that age and blood pressure influence the intima-media thickness, while echocardiographic changes are associated with the IMC.

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The primary purpose of this research is to develop an enhanced understanding of how consumption values influence environmentally responsible consumption of print and digital media. Theoretical elaboration considers the associations of functional, social and emotional consumption values, green consumer segmentation and media consumption. Additionally, the purpose is to identify consumer perceptions of print and digital media’s environmental responsibility. Empirical analysis was based on qualitative interviews with a sample of 20 Finnish consumers categorized in two segments: young adults and middle aged consumers. Primary data collection was conducted through individual, semi-structured interviews. To analyze the respondents’ approach on the topic, the interviews disclosed themes of media consumption, perceived environmental friendliness of media, norms of behavior and consumers’ general consumption patterns. The results implicate functional value dominated the consumption decision-making process both in a general level and in media consumption. In addition to functional value, environmental responsibility does provide consumers with both emotional and social values. Analysis on perceived environmental responsibility of media demonstrated consumers generally perceive digital media as an environmentally responsible alternative because it does not create physical paper waste. Nevertheless, the perceptions of environmental responsibility and media consumption patterns lacked a consistent connection. Though, both theory and empirical results indicated an average consumer lacks a comprehensive understanding of digital and print media’s life-cycle and hence their environmental advantages and disadvantages.

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Two attenuated bacillus Calmette-Guérin (BCG) preparations derived from the same Moreau strain, Copenhagen but grown in Sauton medium containing starch and bacto-peptone (onco BCG, O-BCG), or asparagine (intradermal BCG, ID-BCG), exhibited indistinguishable DNA sequences and bacterial morphology. The number of viable bacilli recovered from spleen, liver and lungs was approximately the same in mice inoculated with the vaccines and was similarly reduced (over 90%) in mice previously immunized with either BCG vaccine. The humoral immune response evoked by the vaccines was, however, distinct. Spleen cell proliferation accompanying the growth of bacilli in tissue was significantly higher in mice inoculated with O-BCG. These cells proliferated in vitro upon challenge with the corresponding BCG extract. Previous cell treatment with mAb anti-CD4 T cells abolished this effect. Anti-BCG antibodies, as assayed either in serum by ELISA or by determining the number of antibody-producing spleen cells by the spot-ELISA method, were significantly higher in mice inoculated with ID-BCG. Anti-BCG antibodies were detected in all immunoglobulin classes, but they were more prevalent in IgG with the following distribution among its isotypes: IgG1>(IgG2a = IgG2b)>IgG3. When some well-characterized Mycobacterium tuberculosis antigens were used as substitutes for BCG extracts in ELISA, although antibodies against the 65-kDa and 96-kDa proteins were detected significantly, antibodies against the 71-kDa, 38-kDa proteins and lipoarabinomannan were only barely detected or even absent. These results indicate that BCG bacilli cultured in Sauton-asparagine medium permitted the multiplication of bacilli, tending to induce a stronger humoral immune response as compared with bacilli grown in Sauton-starch/bacto-peptone-enriched medium.

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In 2006 UPM was able to gain a level of social legitimacy that allowed it to carry out one of the largest industrial restructuring programmes in Finnish industrial history, shut down major operations in Finland and still appear to be functioning in the interests of the nation as well as itself. This study considers and examines various contexts of this shutdown with the aim of demonstrating how profoundly mediated such organizational events are though they appear to be produced primarily through strategic company decisions. The study aims to examine the processes of mediation at two levels. At one level, through close analysis of press releases and newspaper reports in local and national newspapers, the study presents a discursive analysis of the Voikkaa case. The discursive analysis focuses on providing historical contexts for understanding why this organizational event was also an occasion for reimagining the past and future of the Finnish nation; spatial contexts for understanding the differing struggles over the meaning of the event nationally and regionally; and the temporal dynamics of the media reports. At another level, the study considers and refines methods for reading and analyzing mediation in organization studies. Bringing together recent research of media text–based legitimation studies, emerging research on organizational memory and organizational death and a Foucaultian analytics of power, this work suggests that organizational research needs to be less concerned with particular typologies and narratives of shutdowns, and more curious about the processes of mediation through which organizational events are imagined and remembered.

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Synthetic dyes bind to proteins causing selective coprecipitation of the complexes in acid aqueous solution by a process of reversible denaturation that can be used as an alternative method for protein fractionation. The events that occur before precipitation were investigated by equilibrium dialysis using bovine trypsin and flavianic acid as a model able to cause coprecipitation. A two-step mode of interaction was found to be dependent on the incubation periods allowed for binding, with pronounced binding occurring after 42 h of incubation. The first step seems to involve hydration effects and conformational changes induced by binding of the first dye molecule, following rapid denaturation due to the binding of six additional flavianate anions to the macromolecule.

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Tämä kandidaatintutkielma käsittelee sosiaalisen median markkinointia ja sisältöstrategiaa osana B2B-yrityksen markkinointiviestintää. Case-yrityksenä toimineen Maestron kanssa toteutettiin tutkimus, jossa pyrittiin selvittämään suomalaisen yritysjohdon tapoja käyttää sosiaalista mediaa ja kuluttaa sisältöjä. Tulosten perusteella pystyttiin selvittämään kohderyhmälle soveltuvimmat sisältötyypit ja kanavat, sekä tarkastelemaan valittujen markkinointiviestinnän muotojen soveltumista B2B-ympäristöön.

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Exposure to stress induces a cluster of physiological and behavioral changes in an effort to maintain the homeostasis of the organism. Long-term exposure to stress, however, has detrimental effects on several cell functions such as the impairment of antioxidant defenses leading to oxidative damage. Oxidative stress is a central feature of many diseases. The lungs are particularly susceptible to lesions by free radicals and pulmonary antioxidant defenses are extensively distributed and include both enzymatic and non-enzymatic systems. The aim of the present study was to determine lipid peroxidation and total radical-trapping potential (TRAP) changes in lungs of rats submitted to different models of chronic stress. Adult male Wistar rats weighing 180-230 g were submitted to different stressors (variable stress, N = 7) or repeated restraint stress for 15 (N = 10) or 40 days (N = 6) and compared to control groups (N = 10 each). Lipid peroxidation levels were assessed by thiobarbituric acid reactive substances (TBARS), and TRAP was measured by the decrease in luminescence using the 2-2'-azo-bis(2-amidinopropane)-luminol system. Chronic variable stress induced a 51% increase in oxidative stress in lungs (control group: 0.037 ± 0.002; variable stress: 0.056 ± 0.007, P < 0.01). No difference in TBARS was observed after chronic restraint stress, but a significant 57% increase in TRAP was presented by the group repeatedly restrained for 15 days (control group: 2.48 ± 0.42; stressed: 3.65 ± 0.16, P < 0.05). We conclude that different stressors induce different effects on the oxidative status of the organism.

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The present study investigated the protective effect of N-acetylcysteine (NAC) against oxygen radical-mediated coronary artery injury. Vascular contraction and relaxation were determined in canine coronary arteries immersed in Kreb's solution (95% O2-5% CO2), incubated or not with NAC (10 mM), and exposed to free radicals (FR) generated by xanthine oxidase (100 mU/ml) plus xanthine (0.1 mM). Rings not exposed to FR or NAC were used as controls. The arteries were contracted with 2.5 µM prostaglandin F2alpha. Subsequently, concentration-response curves for acetylcholine, calcium ionophore and sodium fluoride were obtained in the presence of 20 µM indomethacin. Concentration-response curves for bradykinin, calcium ionophore, sodium nitroprusside, and pinacidil were obtained in the presence of indomethacin plus Nomega-nitro-L-arginine (0.2 mM). The oxidative stress reduced the vascular contraction of arteries not exposed to NAC (3.93 ± 3.42 g), compared to control (8.56 ± 3.16 g) and to NAC group (9.07 ± 4.0 g). Additionally, in arteries not exposed to NAC the endothelium-dependent nitric oxide (NO)-dependent relaxation promoted by acetylcholine (1 nM to 10 µM) was also reduced (maximal relaxation of 52.1 ± 43.2%), compared to control (100%) and NAC group (97.0 ± 4.3%), as well as the NO/cyclooxygenase-independent receptor-dependent relaxation provoked by bradykinin (1 nM to 10 µM; maximal relaxation of 20.0 ± 21.2%), compared to control (100%) and NAC group (70.8 ± 20.0%). The endothelium-independent relaxation elicited by sodium nitroprusside (1 nM to 1 µM) and pinacidil (1 nM to 10 µM) was not affected. In conclusion, the vascular dysfunction caused by the oxidative stress, expressed as reduction of the endothelium-dependent relaxation and of the vascular smooth muscle contraction, was prevented by NAC.