Academic literature on the topic 'Indice de stress'
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Journal articles on the topic "Indice de stress"
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Silva, Elisabeth Regina Alves Cavalcanti, José Gustavo Da Silva Melo, and Josiclêda Domiciano Galvincio. "Identificação das Áreas Susceptíveis a Processos de Desertificação no Médio Trecho da Bacia do Ipojuca - PE através do Mapeamento do Estresse Hídrico da Vegetação e da Estimativa do Índice de Aridez (Identification of Areas Susceptible to...)." Revista Brasileira de Geografia Física 4, no. 3 (September 25, 2011): 629. http://dx.doi.org/10.26848/rbgf.v4i3.232739.
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Este trabalho procura identificar as areas mais susceptiveis a processos de desertificacao na area correspondente ao medio trecho da Bacia do Ipojuca – PE, localizado no agreste do estado de Pernambuco, tomando como base dados obtidos de postos pluviometricos num periodo amostral de trinta anos com a finalidade de estimar o indice de aridez na area de estudo. Esse indice buscara complementar os resultados obtidos pelo indice de aridez atraves da utilizacao do indice de agua por diferenca normalizada (NDWI) e do indice de vegetacao ajustado ao solo (SAVI). Os resultados obtidos indicam que ha um alto estresse hidrico na Bacia em questao e esse resultado e corroborado pelo indice de aridez da area. Palavras-chaves: Suscetibilidade, mudancas climaticas, impactos ambientais, transposicao do Rio Sao Francisco. Identification of Areas Susceptible to Desertification in the Ipojuca Middle River Basin by Mapping of Vegetation Water Stress and Aridity Index ABSTRACT This paper seeks to identify areas susceptible to desertification in the area corresponding to the middle portion of the Basin Ipojuca - PE, located in the rugged state of Pernambuco, based on data from climatic stations in a sample period of thirty years for the purpose to estimate the index of aridity in the study area. This index will seek to complement the results obtained by the index of aridity by using the water content normalized difference (NDWI) and the vegetation index adjusted for soil (SAVI). The results indicate that there is a high water stress in the basin in question and this result is confirmed by the index of aridity of the area. Keywords: Susceptibility, climate change, environmental impacts, transposition of Rio Sao Francisco.
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PASSALI, D., G. CORALLO, S. YAREMCHUK, M. LONGINI, F. PROIETTI, G. C. PASSALI, and L. BELLUSSI. "Stress ossidativo nei pazienti con diagnosi di sindrome delle apnee ostruttive notturne." Acta Otorhinolaryngologica Italica 35, no. 6 (December 2015): 420–25. http://dx.doi.org/10.14639/0392-100x-895.
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La Sindrome delle Apnee Ostruttive Notturne (OSAS) è una patologia caratterizzata da alterazioni metaboliche e da un elevato rischio di sviluppo di patologie cardiovascolari. Lo scopo dello studio è stato quello di identificare dei markers precoci predittivi di rischio cardiovascolare con la valutazione dello stress ossidativo misurato attraverso esami di laboratorio in soggetti normali e pazienti con diagnosi di sindrome delle apnee ostruttive notturne. È stato effettuato uno studio prospettico per confrontare i risultati di laboratorio ottenuti dalla valutazione dei biomarkers dello stress ossidativo in 20 pazienti adulti con OSAS e 20 soggetti sani. Le tecniche di analisi utilizzate avevano l’obiettivo di identificare e quantificare i danni dei radicali liberi attraverso la misurazione di anti-ossidanti e pro-ossidanti in modo da valutare l’equilibrio ossidativo presente nei due gruppi di studio. I due gruppi di pazienti sono risultati omogeni per sesso, età ed indice di massa corporea (p < 0,05). Una differenza statisticamente significativa è stata individuata tra i livelli di indice di apnea-ipopnea valutata alla polisonnografia e di isoprostani, produzione di proteine di ossidazione e proteine non legate al ferro nei due gruppi in esame. Nessuna differenza significativa è stata trovata nel livello dei tioli tra i soggetti sani e i pazienti con sindrome delle apnee ostruttive. I tioli, a differenza degli altri markers, sono molecole anti-ossidanti, i restanti sono invece espressione di danno ossidativo. I risultati dello studio indicano che i biomarkers potrebbero essere utilizzati come indici di ostruzione delle vie aeree superiori (VAS) e come marcatori precoci di ipossiemia causando processi flogistici ricorrenti e danno locale da radicali liberi a carico delle VAS.
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Pertiwi, Miranti Dian, Endang Sulistyaningsih, Rudi Hari Murti, and Benito Heru Purwanto. "IDENTIFICATION OF HIGH-TEMPERATURE TOLERANCE OF SOME POTATO VARIETIES BASED ON STRESS TOLERANCE INDICE AND CLUSTER ANALYSIS." Agric 34, no. 1 (August 11, 2022): 79–88. http://dx.doi.org/10.24246/agric.2022.v34.i1.p79-88.
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Potato self-sufficiency in Indonesia faces three main problems: rising air temperatures, limited availability of low-temperature land suitable for potato cultivation, and lack of high-temperature tolerant potato varieties. Therefore, it is necessary to identify the tolerance of potato variety to high-temperature. This research was conducted in two locations: the optimum temperature location and the high-temperature location, using nine varieties, are Agria, Andina, Amabile, Cingkariang, Granola L, Granola K, Margahayu, Olympus, and Tedjo-MZ. The study design uses a split plot with three replications. Differences in temperature as the main plot and varieties as subplots. Parameters observed were air temperature, growth, and yield of potato tubers. The analysis carried out were the Stress Sensitivity Index (SSI), Stress Tolerance Index (STI), Yield Stability Index (YSI), and Cluster Analysis. The results showed that there were no tolerant to high-temperature varieties. Based on the STI, only Olympus was a medium tolerant of high temperatures. Based on the Stress Sensitivity Index (SSI), four varieties are moderately susceptible to high temperatures (Olympus, Andina, Cingkariang, and Margahayu). The YSI analysis shows the same results as the SSI. The cluster analysis results showed harmony between the results of the stress index analysis and cluster analysis. Nine varieties had a high similarity (87.3%), meaning that all varieties had the same characteristics and less tolerance to high temperatures. Olympus was the more tolerant variety to high temperatures, followed by Andina, Cingkariang, and Margahayu. The four varieties consider promising potato lines in high-temperature areas.
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Singh, Rajbeer, Prakash Nautiyal, and Rachana Nautiyal. "Evaluation of the ecological state of the major streams located in Doon valley using diatoms as indicators." Journal of Applied and Natural Science 10, no. 1 (March 1, 2018): 500–506. http://dx.doi.org/10.31018/jans.v10i1.1658.
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Biological communities reflect overall ecological integrity (i.e. chemical, physical and biological integrity). Since the diatom species exhibit variation in tolerances to physical and chemical change in water, they are excellent indicators changes in their environment. Based on the dominant categories for each characteristic, the ecological state of the stream can be determined. This study evaluates the ecological state of the streams in Doon Valley. The diatom samples collected at regular monthly intervals from the twelve streams located in the eastern and western Doon were treated with acid-peroxide and mounted in Naphrax for species count at x1500. About 250-300 valves of diatom species were counted and Van Dam ecologic values were computed by OMNIDIA ver. 5.3. pH was alkaliphilous (4), salinity - fresh brackish (2) and oxygenation - continuously high (1) for most of the streams. Saprobity and trophic status was largely β-mesosaprobous (2) and eutraphentic (5), respectively. The Leclercq index also shows non-existent (<10%) to low (10-20%) organic pollution, degradation (IDSE=3.5-3.0) and moderate anthropogenic eutrophication (20.1-45%) in most of the streams attributed to urbanization stress (62 MLD sewage). The water quality based on indices; IBD (Indice biologique diatomèes), IPS (Indice de polluo-sensibilite) and TDI (Trophic Diatom Index) showed the moderate water quality in the streams of the Valley. Like EU Water Framework Directive 2000/60/EC (WFD) India should also have the objective to ensure ecosystem integrity through bio-assessment and not just mere pollution control.
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Ruiz, Gricelda, Mario Rosenmann, Francisco Fernando Novoa, and Pablo Sabat. "Hematological Parameters and Stress Index in Rufous-Collared Sparrows Dwelling in Urban Environments." Condor 104, no. 1 (February 1, 2002): 162–66. http://dx.doi.org/10.1093/condor/104.1.162.
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Abstract A number of wild bird species have fortuitously incorporated themselves into urban life. One of these, the Rufous-collared Sparrow (Zonotrichia capensis), dwells with seemingly similar success in urban and rural areas. Nevertheless, we found that urban Rufous-collared Sparrows have lower body weight, higher blood glucose concentration, higher proportion of heterophils (H), lower proportion of lymphocytes (L), and consequently, a larger H:L stress index, than rural ones. After two weeks of captivity rural birds developed blood characteristics that resembled those of urban birds. These indices reveal typical primary (acute), and secondary (chronic) stress characteristics in the urban birds. Parámetros Hematológicos e Indice de Estrés en Zonotrichia capensis de Ambientes Urbanos Resumen. Varias especies de aves han sido incorporadas a la vida urbana. Una de ellas, Zonotrichia capensis, habita con similar éxito tanto en ambientes urbanos como rurales. Sin embargo, hemos notado que individuos urbanos de Z. capensis tienen un peso corporal menor, mayores niveles de glucosa circulante, mayor proporción de heterófilos (H), menor proporción de linfocitos (L), y consecuentemente un mayor índice de estrés H:L que individuos rurales. Aves rurales mantenidos en cautiverio por dos semanas presentaron cambios hematológicos que concuerdan con las características de las aves urbanas. Estos índices revelan características de estrés primarias (agudas) y secundarias (crónicas) que son típicas en aves urbanas.
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Roy, Suzanne, Robert Simon, and Émilien Pelletier. "Indice de fluorescence algale et variations de pH appliqués à l’étude des effets du pétrole dispersé sur le phytoplancton marin." Water Quality Research Journal 28, no. 4 (November 1, 1993): 723–42. http://dx.doi.org/10.2166/wqrj.1993.039.
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Résumé Le suivi environnemental d’une communauté phytoplanctonique lors de l’imposition d’un stress toxique requiert l’utilisation d’indices écotoxicologiques à la fois rapides et sensibles. Dans ce contexte, une série d’expériences en laboratoire et en mésocosmes de 3,5 m3 a été réalisée afin d’établir l’intérêt de deux indices: (!) la fluorescence algale, avant et après empoisonnement avec le DCMU, et (ii) les variations de pH comme indicateurs de toxicité en présence de pétrole dispersé. Ces deux indices se sont révélés capables de suivre l’évolution de l’activité algale sous des conditions expérimentales reflétant l’hiver et le printemps dans les eaux du fleuve Saint-Laurent et des concentrations de pétrole variables. L’indice de fluorescence utilisé, reflet du potentiel photosynthétique, augmente en présence d’une forte croissance algale mais diminue à de très faibles valeurs dans les réservoirs fortement intoxiqués. Le pH subit aussi une augmentation lorsque la croissance phytoplanctonique, ou plus exactement le bilan net photosynthèse-respiration est positif, alors que la toxicité des produits pétroliers est reflétée par une diminution ou une stabilisation du pH. Les effets d’une contamination pétrolière ainsi que les possibilités d’application de ces méthodes sur le terrain et en laboratoire sont discutés.
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Kitanović, Vladimir. "Stres i prevladavanje stresa u sportu." Aktuelno u praksi: bilten za strucna pitanja u fizickoj kulturi 25, no. 2 (2015): 5–10. http://dx.doi.org/10.5937/aup1502005k.
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The term stress is mentioned in daily life to the extent that we can say that stress has become an integral part of modern human life. Like the rest of the population, even athletes are not spared to the stress and its consequences. Stress is usually mentioned in negative context, and most people think that stress is negative phenomenon. The key concept for understanding what impact stress has on the emotions, behavior and performance of athletes, becomes stress overcoming, since the prevailing opinion that stress does not induce disorders, but the ways how people cope with stress. The aim of this paper is to present the basic theoretical issues related to stress and coping with stress in sport.
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Singer, L. "Dépression, délire, psychose." Psychiatry and Psychobiology 3, S1 (1988): 45s—51s. http://dx.doi.org/10.1017/s0767399x00002649.
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RésuméLors du Congrès de 1986 de l’Association Européenne de Psychiatrie, Pierre Pichot dans son rapport sur les «Voies nouvelles de la classification des états dépressifs» a posé le problème de l’autonomie des dépressions délirantes. Si l’on compare le DSM III-R au DSM III et la version provisoire de la CIM 10 à la CIM 9, on relève des changements importants: la dichotomie dépression psychotique-endogène/névrotique-psychogène-réaetionnelle disparaît, ce qui fut d’ailleurs déjà le cas dans le DSM III, mais surtout le délire dans la dépression devient un indice de gravité et ne situe plus cette forme dans une classe indépendante.A vrai dire la clinique avait déjà montré la nécessité de la suppression de la dichotomie psychotique/névrotique, les critères de différenciation diagnostiques s’étant révélés non fiables, variant suivant les écoles et les psychiatres et la clinique ne permettant pas de dissocier les diverses formes. Pas plus ne peut être maintenu, malgré l’opinion encore en cours chez de nombreux psychiatres, le rapport entre une personnalité déterminée comme le « Typus melanchoticus» de Tellenbach et la dépression délirante. Les recherches actuelles montrent en effet qu’il n’existe Pas de corrélation entre la personnalité et la dépression délirante. Le délire dans la dépression apparaît comme un indice de gravité et un mécanisme psychopathologique de défense contre l’angoisse de mort et la culpabilité. Le délire est une forme de pensée qui peut apparaître chez des individus et des groupes sous la pression de panique ou de stress ou de tensions extrêmes. Cette forme de pensée est fréquente dans certaines cultures où elle peut coexister avec la pensée logique. Dans la dépression le délire est transitoire. L’intégration du fait du délire de la dépression délirante dans la psychose dont les caractéristiques restent pour beaucoup le clivage du réel ne peut être maintenue. Le concept même de psychose doit à l’heure actuelle être contesté du fait de son ambiguité et du flou de sa définition qui varie d’une école et d’une théorie à l’autre. Il n’est plus d’actualité de maintenir la dépression délirante dans la catégorie des psychoses fontionnelles affectives, la différenciation entre psychoses affectives et non affectives devant être remise en cause. Cette façon de voir implique l’unicité de la maladie dépressive, ce qui n’exclut pas I existence de causes multiples. Il est vrai que tant que nous ne connaîtrons pas de façon plus précise l’étiologie et les mécanismes pathologiques, le débat restera ouvert.
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ARNOULD, C., V. MICHEL, and E. LE BIHAN-DUVAL. "Sélection génétique et bien-être des poulets de chair et des reproducteurs." INRAE Productions Animales 24, no. 2 (April 6, 2011): 165–70. http://dx.doi.org/10.20870/productions-animales.2011.24.2.3248.
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En prolongement des conclusions du rapport de la Commission européenne de 2000 sur le bien-être du poulet de chair et dans le cadre de la directive 2007/43/CE, la Commission européenne a confié à l’European Food Safety Authority l’élaboration de deux avis scientifiques. L’un concerne l’impact de la génétique sur le bien-être et la résistance au stress des poulets de chair, l’autre l’impact de la gestion de l’élevage et du logement sur le bien-être des reproducteurs grand-parentaux et parentaux. Cette synthèse s’appuie sur le contenu de ces deux avis publiés en 2010, suite à une expertise scientifique réalisée en 2009/2010. Elle précise tout d’abord en quoi les principaux problèmes de bien-être rencontrés chez les poulets de chair (troubles locomoteurs, dermatites de contact, ascites, syndromes de mort subite, mobilité limitée, confort thermique…) peuvent être affectés par la sélection génétique sur une croissance rapide et un indice de consommation faible. La question des interactions génotype-environnement est également abordée. Sont exposés ensuite les principaux problèmes de bien-être rencontrés chez les reproducteurs en se focalisant sur ceux ayant un lien avec la sélection sur la croissance (restriction alimentaire, agressions entre congénères, mutilations…). Enfin, sont présentés les besoins de recherche qui ont été mis en évidence lors de la rédaction de ces avis et les principales conclusions.
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Ertaş Öztürk, Yasemin, and Duygu Ağagündüz. "Effects of different ingredients on antioxidant and oxidant status of brewed roasted coffee." Food and Health 8, no. 1 (2022): 46–56. http://dx.doi.org/10.3153/fh22005.
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It was aimed to evaluate the effects of different ingredi-ents on total antioxidant sta-tus (TAS) and total oxidant status (TOS) of the brewed Brazil mild roasted coffee. Sugar, sucralose, butter, co-conut-oil, animal and plant-based milk types were add-ed and milk types&sweeteners were combined separately. TAS and TOS were measured and oxidative stress indice (OSI) was calculated. TAS value of coffee with whole milk was the highest among all coffee types. TOS values of coffee with soy milk, with soy milk+sugar and soy milk+sucralose were lower than all other coffee types. When compared to OSI val-ues, coffee with soy milk, with soy milk+sugar and soy milk+sucralose had the lowest OSI values among all coffee types. Moreover, ad-dition of coconut-oil to cof-fee samples increased the TOS and OSI values of cof-fees. While the TOS and OSI of the sugar and su-cralose addition were found higher in comparison to plain coffee; TOS and OSI of the sucralose addition was lower than those sugar combinations. In conclu-sion, the OSI of the coffee may change depending on the alterations of chemical structures and nutritional matrices by the added in-gredients. The addition of soy milk or sucralose in-stead of sugar or whole cow milk instead of oil-based ingredients could be a promising strategy of reduc-ing the oxidative capacity.
Dissertations / Theses on the topic "Indice de stress"
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Garabedian, Charles. "Développement d’un nouvel indice reflet du bien être fœtal : le Fetal Stress Index." Thesis, Lille 2, 2017. http://www.theses.fr/2017LIL2S022/document.
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La surveillance du bien-être fœtal pendant le travail repose essentiellement sur l’enregistrement du rythme cardiaque fœtal (RCF). Celui-ci, même continu pendant le travail, ne permet pas d’évaluer parfaitement l’oxygénation du fœtus ni le risque d’asphyxie néonatale. En effet, cet outil est imparfait et son évaluation subjective avec une importante variabilité d’interprétation inter et intra opérateur. Des examens dits de seconde ligne sont utilisés en pratique courante pour caractériser l’état fœtal : le prélèvement de sang fœtal au scalp pour l’étude de l’équilibre acido-basique du fœtus (pH ou lactates) ou la pose d’électrode au scalp pour étudier l’ECG fœtal (analyse du segment ST). Ces techniques sont néanmoins invasives et sont soumises à des contraintes techniques. Il y a donc un intérêt à développer des moyens d’évaluation du bien être fœtal à la fois objectifs et non invasifs afin de diminuer la survenue d’une asphyxie périnatale. En effet, celle-ci touche 3 à 8 nouveaux nés pour 1000 naissances. La mortalité en période post-natale est de 25 à 50% des cas et ceux qui survivent développeront des troubles sévères (épilepsie, retard neuro-cognitif et comportemental, paralysie cérébrale…). Au cours de l’accouchement, l’asphyxie périnatale se caractérise par une diminution du pH artériel ombilical. Cette mesure du pH sanguin est donc la mesure de référence pour déterminer la sévérité de l’asphyxie.Une des voies étudiées pour améliorer le dépistage des fœtus à risque d’acidose est l’analyse des modifications du système nerveux autonome (SNA) par analyse de la variabilité du rythme cardiaque fœtal. En effet, la fréquence cardiaque fœtale est en permanence sous l’influence du système nerveux autonome et sa variabilité (VFC) est un reflet de la balance sympathique / parasympathique. Le CHU de Lille a développé une nouvelle méthode d’analyse continue de la VFC ayant montré son efficacité chez l’adulte et chez le nouveau né pour l’évaluation du SNA. L’objectif de ce travail de Thèse est d’adapter cette technologie à l’analyse du SNA fœtal pour obtenir un nouvel indice appelé Fetal Stress Index (FSI) et d’évaluer sa pertinence en situation d’acidose.Cette preuve de concept a été effectuée de manière expérimentale chez le fœtus de brebis. Elle s’est réalisée en 2 temps. Nous avons tout d’abord évalué la performance du FSI par rapport aux méthodes classiques d’analyse de la VFC en termes d’aptitude à détecter les variations du SNA. Après injection d’Atropine, parasympatholytique, ou de Propranolol, sympatholytique, nous avons montré que le FSI était une méthode efficace et spécifique d’évaluation des variations du tonus parasympathique du SNA. Cette étude a également montrée la supériorité du FSI par rapport aux méthodes classiques d’analyse de la VFC en termes de sensibilité et de spécificité. Dans un second temps, nous avons évalué ce nouvel indice comme facteur prédictif de l’état acido basique du fœtus dans 2 modèles expérimentaux d’occlusion cordonale. Dans le premier modèle, l’acidose était obtenue par une occlusion continue du cordon avec une réduction de partielle du débit ombilical. Dans le second, nous réalisions des occlusions totales répétées à intervalles réguliers afin de mimer les contractions utérines lors du travail. Dans les 2 études, nous avons observé une hausse du FSI en cas d’acidose avec une corrélation significative entre le FSI et le pH, mais aussi entre le FSI et les lactates dans le second modèle.En conclusion, le FSI constitue un bon reflet de l’activité parasympathique fœtale. Cet indice permet d’étudier les variations du SNA fœtal avec une meilleure sensibilité et une meilleure spécificité que les méthodes usuelles d’analyse de la VFC et semble bien corrélé à l’état acido basique fœtal. Il s’agit donc d’un indice prometteur qu’il sera intéressant d’incorporer dans une analyse multi paramétrique du rythme cardiaque fœtalThe monitoring of fetal well being during labor is essentially based on fetal heart rate (FHR) analysis. The recording of FHR, even continuously during labor, does not fully assess fetal oxygenation or neonatal risk of asphyxia. Indeed, this tool is imperfect and subjective with an important inter and intra-operator variability. Second-line examinations to characterize the fetal state are currently used in routine practice, i.e. scalp fetal blood sampling to study the fetal acid-base balance (pH or lactates) or scalp electrode placement to study the fetal ECG (ST segment analysis). These techniques are nevertheless invasive and subject to technical constraints. There is therefore an interest in developing both objective and non-invasive means of evaluating fetal wellbeing to reduce neonatal encephalopathy. Indeed, its prevalence is about 3 to 8 per 1000 births. Post natal mortality is about 25 to 50% and survivors will hav severe diseases (epilepsy, neurologic impairment, cerebral palsy…).One of the possibilities studied to better identify fetuses at risk for acidosis is the analysis of changes in the autonomic nervous system (ANS) in response to hypoxia.Indeed, the regulation of heart rate is dependent on the ANS and thus, its variability is a reflection of the sympathetic / parasympathetic balance. Analysis of heart rate variability (HRV) is a recognized non-invasive tool that is used to assess ANS regulation. The CHU Lille has developed a new continuous tool for the analysis of HRV, which demonstrated its efficacity in adults and neonates to evaluate the ANS. The objective of this thesis was to develop its index, called Fetal Stress Index (FSI), in the fetus and to evaluate it in conditions of acidosis.The study was experimental in a sheep model chronically instrumented and was in 2 steps. First, we evaluate the performance of our method compared to commonly used HRV analysis, regarding the ability to detect the variation of variations of the ANS. After injection of atropine, to inhibit parasympathetic tone, or propranolol to block sympathetic activity, we shown that our method appeared to be effective in detecting parasympathetic inhibition and, moreover, was superior to classical analysis of HRV in terms of sensibility and specificity.In a second time, we evaluated this new index as a predictive factor of the fetal acid-base state in 2 experimental models of fetal hypoxia by occlusion of the cord. In the first one, acidosis was obtained through a partial occlusion of the umbilical cord and in the second one, though repetitive complete occlusion as uterine contractions during labor. In those two studies, we observed a raise of our index in case of acidosis with a correlation beetween FSI and pH and also FSI and lactates in the second model.In conclusion, the FSI reflects fetal parasympathetic activity, has a better detection than others usual methods, and seems well correlated to fetal acid-base status. It is a promising index and it will be interesting to incorporate it in a multi parametric analysis of fetal heart rate to predict acidosis
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Alberton, Emanuele <1989>. "Stress Finanziario Sistemico: Sviluppo di un Indice e Confronto tra Eurozona e USA." Master's Degree Thesis, Università Ca' Foscari Venezia, 2013. http://hdl.handle.net/10579/3517.
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Con lo svilupparsi di cambiamenti strutturali come la liberalizzazione finanziaria e la globalizzazione dei sistemi finanziari, i policy maker hanno iniziato sempre più ad interessarsi alla stabilità finanziaria. Avvenimenti quali la crisi del Long-Term Capital Management, la bolla speculativa informatica del nuovo millennio e, soprattutto, la crisi finanziaria globale iniziata nel 2007 hanno rimarcato la necessità di comprendere la relazione tra sistema finanziario ed economia reale.
Attraverso una revisione della letteratura accademica circa definizione e natura della stabilità dei sistemi finanziari, si procede al calcolo di un Indice di Stress Finanziario per gli USA e uno per l'Eurozona. Tale strumento risulta utile in più campi: in ambito accademico, per studiare i collegamenti tra stabilità finanziaria, stabilità monetaria ed economia reale; in ambito istituzionale, per calcolare lo stato di salute di un sistema finanziario al fine di decidere tempo e natura degli interventi di politica economica; in ambito aziendale, come strumento aggiuntivo per la valutazione degli investimenti.
La scelta delle variabili che compongono gli indici si basa sulle best practice internazionali. Le variabili sono pesate mediante l'utilizzo della Principal Component Analysis (PCA), una tecnica econometrica, destinata alla riduzione della dimensionalità dei dati, che coglie i principali trend nascosti nella nuvola di osservazioni relative alle variabili di input.Questo elaborato approfondisce il tema della stabilità dei sistemi finanziari. Attraverso una revisione della letteratura accademica circa la sua definizione e la sua natura, si arriva al calcolo di un Indice di Stabilità Finanziaria per gli USA e uno per l'Eurozona. Tale strumento risulta utile in più campi: in ambito accademico, per studiare i collegamenti tra stabilità finanziaria, stabilità monetaria ed economia reale; in ambito istituzionale, per calcolare lo stato di salute di un sistema finanziario al fine di decidere tempo e natura degli interventi di politica economica; in ambito aziendale, come strumento aggiuntivo per la valutazione degli investimenti.
Con lo svilupparsi di cambiamenti strutturali come la liberalizzazione finanziaria e la globalizzazione dei sistemi finanziari, i policy maker hanno iniziato sempre più ad interessarsi alla stabilità finanziaria. Avvenimenti quali la crisi del Long-Term Capital Management, la bolla speculativa informatica del nuovo millennio e, soprattutto, la crisi finanziaria globale iniziata nel 2007 hanno rimarcato la necessità di comprendere la relazione tra sistema finanziario ed economia reale.
Attraverso una revisione della letteratura accademica circa definizione e natura della stabilità dei sistemi finanziari, si procede al calcolo di un Indice di Stress Finanziario per gli USA e uno per l'Eurozona. Tale strumento risulta utile in più campi: in ambito accademico, per studiare i collegamenti tra stabilità finanziaria, stabilità monetaria ed economia reale; in ambito istituzionale, per calcolare lo stato di salute di un sistema finanziario al fine di decidere tempo e natura degli interventi di politica economica; in ambito aziendale, come strumento aggiuntivo per la valutazione degli investimenti.
La scelta delle variabili che compongono gli indici si basa sulle best practice internazionali. Le variabili sono pesate mediante l'utilizzo della Principal Component Analysis (PCA), una tecnica econometrica, destinata alla riduzione della dimensionalità dei dati, che coglie i principali trend nascosti nella nuvola di osservazioni relative alle variabili di input.
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Ferreira, Heloisa Aparecida 1966. "Intervenção fisioterapeutica reduz o indice de estresse em vestibulandos." [s.n.], 2009. http://repositorio.unicamp.br/jspui/handle/REPOSIP/314617.
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Orientadores: Regina Celia Spadari, Dora Maria Grassi-KassisseDissertação (mestrado) - Universidade Estadual de Campinas, Instituto de Biologia
Made available in DSpace on 2018-08-13T08:58:41Z (GMT). No. of bitstreams: 1 Ferreira_HeloisaAparecida_M.pdf: 1416925 bytes, checksum: c164e67b3f6e3036b77bf57bb5259598 (MD5) Previous issue date: 2009
Resumo: Certo nível de estresse é benéfico ao desempenho e à sobrevivência, mas a constante ou inadequada resposta de estresse pode trazer sérios riscos à saúde e prejudicar o desempenho. Estudos com vestibulandos justificam-se pela alta concentração de cortisol encontrada em amostras de saliva coletadas nos meses em que são feitas as inscrições e nos dias dos exames vestibulares. Este trabalho propõe não somente avaliar os índices de estresse, mas também uma alternativa de abordagem terapêutica não medicamentosa para reduzir os índices de estresse no período que antecede o vestibular e, com isso, melhorar o desempenho nas provas. Em um primeiro estudo, o índice de estresse percebido foi avaliado em estudantes matriculados em um curso pré-vestibular, nos meses de março, setembro e novembro utilizando-se o Questionário de Estresse em Adolescentes (QEA). Os escores obtidos no QEA foram mais baixos em março do que em setembro e novembro, maior nas meninas que nos meninos e ainda diferentes entre os turnos matutino, vespertino e noturno. No estudo 2 uma mostra de 32 voluntários foi submetida à terapia manual de mobilização muscular e da fáscia, em duas sessões semanais, de 40 minutos, de setembro a novembro. Outro grupo não recebeu o tratamento. O índice de estresse percebido foi avaliado em setembro e, juntamente com a memória declarativa de curto e longo prazo, também na semana que antecedeu o exame vestibular. A concentração salivar de cortisol foi determinada em setembro e no dia do exame. Vestibulandos tratados não apresentaram aumento da concentração salivar de cortisol momentos antes da prova, ao contrário do que ocorreu com aqueles do grupo controle; apresentaram também menor escore no QEA, melhor desempenho nos testes de memória, e maior índice de aprovação na primeira fase do vestibular. Concluímos que a intervenção fisioterapêutica aplicada foi eficiente em reduzir o índice de estresse dos vestibulandos e resultou em melhor desempenho no exame.
Abstract: Although certain stress levels might be beneficial to the performance and survival, the constancy of stressors or an inadequate stress response may cause risks to health and may trigger or worsen a variety of diseases. In order to adopt preventive or curative strategies it is necessary to identify the high-risk groups by determining the stress levels. Studies in Brazilian adolescents during the year they are preparing to fight for a vacancy in the public universities are justified by the high concentration of cortisol, one of the stress hormones, found in these students? saliva samples, collected not only in the exams period but also during the period they do the option for the university they want to attend. The objective of this work is to determine the stress levels in students preparing to apply for the universities (study 1), and also to suggest an alternative of non-pharmacological therapy in order to reduce the stress levels in the students during the exam period and then, improving their performance (study 2). In the first study, we determined the perceived stress level in the students attending a preparatory course, in March (beginning of the school year), November (when they apply for the exams) and in November (in the week they do the exams) by using the Adolescent Stress Questionnaire (ASQ, Byrne, 2005). In the study 2, 32 volunteers were submitted to 40 min manual therapy, twice a week, from September to November. Another group of students not submitted to the therapy was evaluated as control. The cortisol concentrations were determined in four saliva samples collected during one day in the period of registration and on the day of the exam, the index of perceived stress and the performance in a memory test aimed to evaluate short and long term declarative memory were evaluated in the week before the exam. The results showed that the ASQ scores were lower in March than September and November. They also have shown that the students who had not undergone the manual therapy presented an increase in the concentration of salivary cortisol before the exam, what did not occurred with the students in the treated group. Moreover, the treated group also scored lower in the perceived stress questionnaire, exhibited a better performance in the short term memory tests and a higher rate of success in the exams. We concluded that the applied physiotherapy program was effective to reduce the students stress levels and improved their performance in the exam.
Mestrado
Fisiologia
Mestre em Biologia Funcional e Molecular
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Morin, Catherine. "Indice de stress financier pour le Canada : mesure de l'instabilité financière à l'aide de l'analyse en composantes principales." Thesis, Université Laval, 2014. http://www.theses.ulaval.ca/2014/30705/30705.pdf.
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Les marchés financiers sont souvent sujets à d’importantes perturbations, les plus récentes ayant été observées lors de la crise financière de 2008. Ces perturbations peuvent être qualifiées de stress financier, qui se définit comme une interruption du fonctionnement normal des marchés financiers. Ce mémoire propose de mesurer le stress du marché financier canadien, en s’inspirant de l’analyse effectuée par KLIESEN et SMITH [2010] pour les États-Unis. Ces auteurs, qui travaillent à la Réserve fédérale de Saint-Louis, proposent une approche basée sur une analyse en composante principale. Nos résultats montrent que le stress sur les marchés canadiens a une évolution similaire à celui des États-Unis. Un test de causalité de Granger indique que le stress financier américain cause du stress financier sur le marché canadien. Par la suite, la méthode d’analyse en composantes principales non linéaire par noyau (KPCA) est utilisée sur les données américaines et canadiennes. Cette nouvelle méthodologie permet de mieux illustrer le comouvement entre les séries temporelles, lorsque l’on admet des corrélations potentiellement non linéaires. Les résultats montrent que cette nouvelle méthode permet d’obtenir des graphiques dont le bruit est réduit, et avec des structures mieux définies. L’amplitude des évènements de stress est changée, mais l’indice garde la même évolution qualitative.Financial markets are often affected by important perturbations, as witnessed during the 2008 financial meltdown. These perturbations can be seen as a form of financial stress and are defined as an interruption of normal working financial market. This thesis proposes to measure the financial stress in the Canadian market, using a principal component methodology used by the Saint-Louis Federal Reserve (KLIESEN and SMITH [2010]). Our results show that the financial stress occurring on the Canadian market is stongly related to financial stress: notably US financial stress granger causes financial stress on the Canadian market. Additionally, we use a kernel principal component analysis (KPCA) on both US and Canadian data, to account for second and third degree effects in covariance structures. The kernel analysis reduces the noise on the stress graph. Similar structures are visible and qualitative features are the same, but the relative amplitude of these structures is changed.
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Bolongo, Mpembe. "Effets de la CCK [indice] 4 et de différents stress expérimentaux sur les concentrations cérébrales de diverses amines biogènes." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape2/PQDD_0019/MQ56867.pdf.
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Bolongo, Mpembe. "Effets de la CCK [indice] 4 et de différents stress expérimentaux sur les concentrations cérébrales de diverses amines biogènes." Sherbrooke : Université de Sherbrooke, 2000.
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Pirozzi, Flavio Fontes. "Relação entre o índice de massa corpórea, diabetes mellitus tipo 2, estresse oxidativo e polimorfismos nos genes da enzima conversora de angiotensina (ECA) e metilenotetrahidrofolato redutase (MTHRF) /." São José do Rio Preto, 2016. http://hdl.handle.net/11449/148006.
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Orientador: Milton Artur RuizCoorientador: Claudia Regina Bonini Domingos
Banca: Antônio Carlos Pires
Banca: Sônia Maria Oliani
Resumo: Introdução: o aumento da prevalência da obesidade e do diabetes mellitus tipo 2 (DM2) é um grande desafio de saúde pública mundial e, por serem doenças heterogêneas e que elevam a chance do surgimento de doenças cardiovasculares, parâmetros de avaliação de risco são necessário na avaliação destes indivíduos. Objetivos: correlacionar diferentes variáveis como o índice de massa corpórea (IMC), os polimorfismos I/D ECA e C677T MTHFR e provas de estresse oxidativo em uma população de obesos brasileiros, com e sem diabetes, e doenças associadas com a síndrome metabólica. Casuística e métodos: avaliamos 125 indivíduos com obesidade (IMC maior ou igual a 30 Kg/m2 ) que foram divididos em dois grupos: grupo DM2 (obesos com DM2, n = 47) e grupo controle (obesos sem DM2, n= 78). Os pacientes do grupo DM2 apresentavam maior média de idade (p=0,02) e maior número de indivíduos com dislipidemia (p<0,05). Por meio de uma amostra de sangue periférico foi avaliado os polimorfismos I/D ECA e C677T MTHRF e as provas de estresse oxidativo, o TBARS e o TEAC. Resultados: na comparação entre os grupos com os polimorfismos analisados, não encontramos diferença significativa de chance de ocorrência e proteção para o DM2 em diferentes modelos de herança, na avaliação dos genótipos e no sinergismo entre eles. No polimorfismo I/D ECA, o genótipo mais frequente em ambos os grupos é o DD. Também não encontramos diferença significativa destes polimorfismos e as complicações microvasculares no grupo DM2. Correlacionando o IMC com o estresse oxidativo, encontramos uma correlação diretamente com o TBARS (r =0,7941) e inversamente proporcional com o TEAC (r=-0,6022) de forma significativa (p<0,0001). Entretanto, não houve diferença nos valores médios de TBARS e do TEAC entre os grupos DM2 e controle. O genótipo DD foi o mais frequente em ambos e o mesmo...
Abstract: Introduction: the increase in the prevalence of obesity and type 2 diabetes mellitus (T2DM) is a major global public health challenge and, because they are heterogeneous diseases that increase the chance of cardiovascular diseases, risk assessment parameters are necessary in the evaluation of these individuals. Aims: to correlate different variables such as body mass index (BMI), ACE I/D and MTHFR C677T polymorphisms, and oxidative stress tests in a population of obese Brazilians, with and without diabetes, and diseases associated with metabolic syndrome. Casuistry and methods: we evaluated 125 individuals with obesity (BMI greater than or equal to 30 kg /m 2 ) who were divided into two groups: T2DM group (obese with T2DM, n = 47) and control group (obese without T2DM, n = 78). Patients in the T2DM group presented higher mean age (p=0.02) and higher number of individuals with dyslipidemia (p<0.05). The ACE I/D and MTHRF C677T polymorphisms and the oxidative stress, TBARS and TEAC tests, were evaluated using a peripheral blood sample. Results: in the comparison between the groups with the analyzed polymorphisms, we do not find a significant difference in the chance of occurrence and protection for T2D in different inheritance models, in the evaluation of genotypes and in the synergism between them. In the ACE I/D polymorphism, the most frequent genotype in both groups is DD. We also do not find a significant difference of these polymorphisms and the microvascular complications in the T2DM group. Relating BMI to oxidative stress, we found a correlation directly with TBARS (r=0.7941) and inversely proportional to the TEAC (r =-0.6022) in a significant way (p <0.0001). However, there was no difference in the mean values of TBARS and TEAC between T2DM and control groups. The DD genotype was the most frequent in both, and the same is related to increased cardiovascular risk. In the ...
Mestre
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Main, Oscar. "Optimising forage maize's digestible yield under contrasted environments." Electronic Thesis or Diss., université Paris-Saclay, 2024. http://www.theses.fr/2024UPASB019.
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Le maïs occupe une place centrale dans le système fourrager français, son rendement et sa valeur énergétique étant deux critères clés pour l'inscription des variétés hybrides de maïs au catalogue officiel français. Des recherches antérieures ont montré une corrélation directe entre la valeur énergétique et la digestibilité de la matière sèche (MS), influencée par la digestibilité de la paroi, elle-même affectée par le déficit hydrique. Des études sur des lignées de maïs ont montré que le déficit hydrique sévère augmente la digestibilité de la MS et de la paroi, liées à une diminution de la teneur en lignine et à des changements dans sa distribution tissulaire. Cependant, comme la teneur en lignine a déjà été fixée dans les variétés hybrides, elle semble avoir peu de potentiel pour améliorer davantage la digestibilité de la paroi. Pour explorer d'autres cibles et l'impact du déficit hydrique sur ces caractères, ce travail de thèse a été mené dans le cadre du projet Carnot Plant2Pro INRAE-ARVALIS MAMMA MIA. Des variétés de maïs hybrides modernes, représentatifs du marché français actuel (maïs S0-S1 très précoces à précoces), ont été cultivés pendant deux ans dans seize conditions environnementales contrastées, dont six en conditions d'irrigation contrôlée. Tout d'abord, un indice de stress (SID) simple mais robuste a été établi, tenant compte du déficit hydrique du sol et de la température de l'air. Ce SID s'est révélé être un outil crucial en classant les différents environnements, mettant en évidence l'impact d'un stress sévère dû à des températures élevées sur la digestibilité de la MS par rapport à des conditions de stress modéré. Pour être en mesure d'étudier une large gamme de conditions environnementales, plusieurs équations de prédiction par spectroscopie proche infrarouge (NIRS) ont également été développées, capables de prédire de manière robuste et précise des caractères de la paroi et leurs relations, similaires à celles mesurées en biochimie au laboratoire. Bien que ces équations se révèlent suffisamment robustes pour être utilisées dans les programmes de sélection, une vigilance s'impose quant à l'exactitude des prédictions en conditions de stress, en particulier dans le cas des variétés hybrides où la gamme de variation des caractères est souvent limitée. L'ensemble des données obtenues a ensuite permis une analyse multi-échelle, intégrant des caractères agroclimatiques, agronomiques, biochimiques et histologiques, ainsi que des données expérimentales in sacco obtenues sur des vaches fistulées. Des cibles biochimiques et histologiques ont pu être proposées pour améliorer la qualité du maïs fourrager en fonction de l'intensité du stress. Nous avons montré qu'en condition de stress sévère, bien que la production d'épis diminue significativement, la digestibilité de la MS peut être maintenue grâce à une augmentation de la digestibilité de la paroi, due à une réduction de la teneur en acides p-hydroxycinnamique, alors que la teneur en lignine reste stable comme attendu. Nous avons également montré qu'en condition de stress modéré les caractères histologiques jouent un rôle aussi important que les caractères biochimiques, mais qu'une fois qu'un seuil est atteint, seuls les caractères biochimiques modulent les variations de la digestibilité de la paroi. Une fenêtre environnementale a donc pu être mise en évidence où le rôle accru de la distribution de la lignine aux côtés des caractères biochimiques permet une augmentation du rendement digestible. Ainsi, les agriculteurs pourraient exploiter cette fenêtre pour augmenter la productivité, en régulant l'irrigation en condition de sécheresse modérée et en intégrant le SID dans un outil de gestion de l'irrigationMaize stands as a pillar of the French forage system, with its yield and silage feeding value serving as key criteria for the registration of maize hybrid varieties in the official French catalogue. Previous research on this topic has revealed a direct correlation between silage feeding value and dry matter (DM) digestibility, which is, in turn, constrained by cell wall (CW) digestibility and significantly affected by water deficit. Studies on maize inbred lines have shown that under severe water deficit conditions, both DM and CW digestibilities increase. This increase correlates with a decrease in lignin content and changes in lignin distribution. However, it is noteworthy that breeding efforts have already fixed lignin content in hybrid varieties. Therefore, lignin content is unlikely to be a source of future digestibility improvement. To explore other CW targets and the impact of water deficit on these traits, this PhD study was conducted as part of the Carnot Plant2Pro INRAE-ARVALIS MAMMA MIA project. We grew a range of modern forage maize hybrids representative of the current S0-S1 (very-early to early flowering earliness) French market for two years under sixteen contrasted environmental conditions, including six in controlled irrigation conditions. First, we established a simple but robust stress index (SID) that considers the water deficit in the soil and the air temperature. This SID provided a key environmental ranking tool, highlighting severe stress due to high temperature that significantly impacted DM digestibility compared to moderate stress conditions. Secondly, to encompass a wide range of environmental conditions in biochemical quantifications, we developed several predictive near-infrared spectroscopy (NIRS) equations capable of robustly and accurately predicting fine cell wall traits and relationships, mirroring levels observed in laboratory experiments. While these equations prove sufficiently robust for use in selection programs, we emphasize the need for vigilance in accurately estimating prediction accuracy under stress conditions, particularly in equations applied to hybrid material where trait variation ranges are often limited. The core dataset of this work enabled a multiscale analysis, integrating agroclimatic, agronomic, biochemical, and histological traits, along with in sacco experimental data on cows. We proposed biochemical and histological traits to improve the quality of forage maize depending on stress intensity. We demonstrated that under severe stress, ear production decreases significantly, but DM digestibility can be maintained by increasing CW digestibility. This boost in CW digestibility was due to a reduction in p-hydroxycinnamic acid content, while lignin content remained stable, as anticipated. The significance of lignin distribution increased with the severity of stress, reaching an extreme threshold where biochemical parameters solely account for digestibility variations. This two-threshold model presents a window of opportunity located at the first threshold between non-stressed and moderately stressed environments, where the increased role of lignin distribution alongside biochemical traits enabled an increase in digestible yield. By controlling irrigation doses in the field under moderate drought conditions and integrating the SID into an irrigation management tool, farmers could exploit this window to increase productivity
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Duprey, Thibaut. "Procyclicality of the banking sector : heterogeneity and extreme risk." Paris, EHESS, 2015. http://www.theses.fr/2015EHES0095.
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Pendant la récente crise financière, une attention particulière a été portée à la procyclicité des intermédiaires financiers. Cette thèse contribue à une meilleure compréhension de leur comportement au cours du cycle économique. Les deux premiers chapitres, en adoptant une approche plus microéconomique, analysent l'impact de certaines différences entre banques sur leur provision de crédit. Ainsi les banques détenues par l'État ont généralement une meilleure capacité d'absorption des chocs négatifs. Des cycles du crédit différenciés peuvent également résulter d'une externalité qui amène à distinguer les banques en fonction de leur efficacité dans leur acquisition d'information ; auquel cas, davantage d'hétérogénéité entre banques génère une mauvaise allocation du crédit et impacte négativement la productivité de l'économie. Dans une perspective plus macroéconomique, le troisième article se focalise sur la procyclicité du levier bancaire comme source de fragilité en cas de choc extrême. La procyclicité inhérente des forces de marché engendre une accumulation du risque, ce qui peut justifier une régulation du levier bancaire. Le dernier chapitre s'intéresse à l'interaction entre les cycles réels et financiers et permet d'identifier les événements de stress financier systémique, qui peuvent se définir comme des périodes de stress sévère et simultané sur plusieurs marchés. Ces travaux devraient contribuer à la mise en place d'un nouveau cadre réglementaire macroprudentielThe procyclicality of financial intermediaries has been a key source of concern during the recent financial crisis. This thesis sheds a new light on several aspects of their behaviour over the economic cycle. The first two chapters take a bank level approach and analyse to which extent some type of heterogeneity among banks impacts the provision of credit throughout the cycle. I document that government-owned banks are usually in a better position to lend against the wind in periods of stress. Heterogeneous lending cycles can also arise as a result of an externality among banks more or less efficient in information acquisition, in which case, more banking heterogeneity distorts the allocation of credit and is detrimental to aggregate productivity. In a more macroeconomic perspective, the third chapter focuses on the procyclicality of banks' leverage as a source of fragility in case of extreme stress. The inherent procyclicality of market forces leads to an endogeneous build up of risk, which can justify bank leverage regulations. In the last chapter I investigate the interplay between the real and financial cycles and identify systemic financial stress events that can be understood as periods of severe and simultaneous stress on several markets. This work is particularly relevant for the new macroprudential regulatory framework
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Miller, Berry Juanita K. "How does stress induce headache? An experimental study." Thesis, Miller Berry, Juanita K. (2020) How does stress induce headache? An experimental study. Professional Doctorate thesis, Murdoch University, 2020. https://researchrepository.murdoch.edu.au/id/eprint/59729/.
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Psychological stress triggers headaches, but how this happens is unclear. To explore this, 38 episodic migraine sufferers, 28 with tension-type headache (T-TH) and 20 controls rated nausea, negative affect, task-expectancies and headache at 5-minute intervals during an unpredictable and uncontrollable 25-minute mental arithmetic task with a non-contingent failure rate. Blood pressure and pulse rate were measured every 3 minutes and salivary cortisol was sampled before and after the task. Trigeminal activation was measured by nociceptive blink reflex measures during each of the three experimental phases.
Multiple regression analyses indicated that negative affect (NA) was the strongest predictor of headache intensity during the task. Increases in stress-headache were unrelated to consistent changes in cardiovascular activity but were related to declines in cortisol and increased post-task trigeminal activity. In repeated measures ANOVAs, participants who developed headache had higher nausea, NA and self-efficacy expectancies than those with no-or-low headache (p <.05 to p <.001). In further multiple regression analyses to identify which aspects of the stress process contributed to the high NA preceding headache, discouragement, anxiety, irritation and tension mediated the relationship between headache intensity during the stressful task and primary and secondary appraisal processes (stressor exposure and stressor reactivity). Avoidant coping, perceived inability to decrease pain, and outcome expectancy independently predicted headache intensity during the stressful task. Anxiety mediated the relationship between headache intensity and the coping tactics of wishful thinking, self-criticism, pain catastrophizing and praying/hoping. Attachment anxiety and the personality traits of openness, agreeableness and conscientiousness moderated the relationship between stress appraisals and headache. Results were discussed using the model of stress-headache as allostatic load.
Findings suggest that headache developed when participants overextended themselves during a stressful task, adopting an information processing style which impeded emotional adjustment to changing situational demands. Learning to modify perceptions of threat and adopting a more flexible, less outcome-dependent processing style which avoids response conflict might help to prevent headache from spiralling upward.
Books on the topic "Indice de stress"
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C, Parsons K., Fox J. G, and Metz B, eds. Heat stress indices. London: Taylor & Francis, 1995.
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Bootsma, A. Stress indices for spring wheat on the Canadian prairies. Ottawa: Research Branch, Agriculture Canada, 1992.
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Magnólia Sousa Bandeira de Melo. Indice toponímico do centro histórico de São Luís. São Luís: Universidade Federal do Maranhão, Departamento de Biblioteconomia, 1990.
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Comics, Evil Twin. Awesome: The indie spinner rack anthology. Brooklyn, NY: Evil Twin Comics, 2007.
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W, May C., University of Washington. Environmental Engineering and Science Program., and Washington (State). Dept. of Ecology., eds. Quality indices for urbanization effects in Puget Sound Lowland streams. Seattle, WA: [Environmental Engineering and Science, Dept. of Civil Engineering, University of Washington, 1997.
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Lloyd, Evan L. Hypothermia and cold stress. Rockville, Md: Aspen Systems Corp., 1986.
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Ram, Samay. Stress, suicides, and fratricides in the army: Crisis within. New Delhi: Vij Books India Pvt Ltd, 2011.
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Pestonjee, D. M. Stress and coping: The Indian experience. 2nd ed. Thousand Oaks, Calif: Sage, 1998.
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Pestonjee, D. M. Stress and coping: The Indian experience. New Delhi: Sage Publications, 1992.
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1947-, Cohen Sheldon, ed. Behavior, health, and environmental stress. New York: Plenum Press, 1986.
Find full textBook chapters on the topic "Indice de stress"
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Matic, Ivan. "Stress-Induced Mutagenesis in Bacteria." In Stress-Induced Mutagenesis, 1–19. New York, NY: Springer New York, 2013. http://dx.doi.org/10.1007/978-1-4614-6280-4_1.
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Mothersill, Carmel, and Colin Seymour. "Radiation-Induced Bystander Effects and Stress-Induced Mutagenesis." In Stress-Induced Mutagenesis, 199–222. New York, NY: Springer New York, 2013. http://dx.doi.org/10.1007/978-1-4614-6280-4_10.
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Tang, Ho Lam, Ho Man Tang, and Denise J. Montell. "Stress Induced Mutagenesis, Genetic Diversification, and Cell Survival via Anastasis, the Reversal of Late Stage Apoptosis." In Stress-Induced Mutagenesis, 223–41. New York, NY: Springer New York, 2013. http://dx.doi.org/10.1007/978-1-4614-6280-4_11.
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Dubrova, Yuri E. "The Transgenerational Effects of Parental Exposure to Mutagens in Mammals." In Stress-Induced Mutagenesis, 243–55. New York, NY: Springer New York, 2013. http://dx.doi.org/10.1007/978-1-4614-6280-4_12.
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De, Subhajyoti, and R. Matthew Ward. "Revisiting Mutagenesis in the Age of High-Throughput Sequencing." In Stress-Induced Mutagenesis, 257–70. New York, NY: Springer New York, 2013. http://dx.doi.org/10.1007/978-1-4614-6280-4_13.
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Shee, Chandan, P. J. Hastings, and Susan M. Rosenberg. "Mutagenesis Associated with Repair of DNA Double-Strand Breaks Under Stress." In Stress-Induced Mutagenesis, 21–39. New York, NY: Springer New York, 2013. http://dx.doi.org/10.1007/978-1-4614-6280-4_2.
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Robleto, Eduardo, Holly A. Martin, Carmen Vallin, Mario Pedraza-Reyes, and Ronald Yasbin. "Transcription-Mediated Mutagenic Processes." In Stress-Induced Mutagenesis, 41–57. New York, NY: Springer New York, 2013. http://dx.doi.org/10.1007/978-1-4614-6280-4_3.
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Zhang, Zhongge, Jing Wang, Maksim A. Shlykov, and Milton H. Saier. "Transposon Mutagenesis in Disease, Drug Discovery, and Bacterial Evolution." In Stress-Induced Mutagenesis, 59–77. New York, NY: Springer New York, 2013. http://dx.doi.org/10.1007/978-1-4614-6280-4_4.
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Lu, Xiangyi, Luan Wang, Vincent E. Sollars, Mark D. Garfinkel, and Douglas M. Ruden. "Hsp90 as a Capacitor of Both Genetic and Epigenetic Changes in the Genome During Cancer Progression and Evolution." In Stress-Induced Mutagenesis, 79–101. New York, NY: Springer New York, 2013. http://dx.doi.org/10.1007/978-1-4614-6280-4_5.
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Seong, Ki-Hyeon, Toshio Maekawa, and Shunsuke Ishii. "Inheritance of Stress-Induced Epigenetic Changes Mediated by the ATF-2 Family of Transcription Factors." In Stress-Induced Mutagenesis, 103–18. New York, NY: Springer New York, 2013. http://dx.doi.org/10.1007/978-1-4614-6280-4_6.
Full textConference papers on the topic "Indice de stress"
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Lee, Samantha, Jonathan Doan, John C. Bravman, Paul A. Flinn, Thomas N. Marieb, and Shinichi Ogawa. "Comparison of electromigration behavior in passivated aluminum interconnects." In STRESS INDUCED PHENOMENA IN METALLIZATION. ASCE, 1998. http://dx.doi.org/10.1063/1.54632.
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Lee, T. J., H. J. Park, C. S. Song, S. J. Kim, W. S. Park, and N. Y. Kim. "Enhancement of electromigration lifetime of aluminum interconnection line by stress accommodation of interfaced oxide." In STRESS INDUCED PHENOMENA IN METALLIZATION. ASCE, 1998. http://dx.doi.org/10.1063/1.54633.
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Hu, C.-K., K. Y. Lee, L. Gignac, and R. Carruthers. "Electromigration in physical vapor deposited Cu lines." In STRESS INDUCED PHENOMENA IN METALLIZATION. ASCE, 1998. http://dx.doi.org/10.1063/1.54634.
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Verbruggen, A. H., M. J. C. van den Homberg, L. C. Jacobs, A. J. Kalkman, J. R. Kraayeveld, and S. Radelaar. "Resistance changes induced by the formation of a single void/hillock during electromigration." In STRESS INDUCED PHENOMENA IN METALLIZATION. ASCE, 1998. http://dx.doi.org/10.1063/1.54635.
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Spolenak, R., O. Kraft, W. D. Nix, and E. Arzt. "Alloying effects in electromigration: Modeling and experiments." In STRESS INDUCED PHENOMENA IN METALLIZATION. ASCE, 1998. http://dx.doi.org/10.1063/1.54636.
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Ohtomo, Yusuke, and Kazuyoshi Nishimura. "Requirements for highly reliable VLSI multilevel interconnection." In STRESS INDUCED PHENOMENA IN METALLIZATION. ASCE, 1998. http://dx.doi.org/10.1063/1.54637.
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Shingubara, S., T. Osaka, S. Abdeslam, H. Sakue, and T. Takahagi. "Void formation mechanism at no current stressed area." In STRESS INDUCED PHENOMENA IN METALLIZATION. ASCE, 1998. http://dx.doi.org/10.1063/1.54638.
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Grosjean, D. E., H. Okabayashi, M. Komatsu, and H. Mori. "Side-view TEM observations of precipitates and voids in Al-2wt %Cu lines." In STRESS INDUCED PHENOMENA IN METALLIZATION. ASCE, 1998. http://dx.doi.org/10.1063/1.54639.
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Schroeder, Herbert, and Dirk Heinen. "In-situ TEM-investigation of stress- and electromigration-induced void formation and growth in passivated Al-interconnects." In STRESS INDUCED PHENOMENA IN METALLIZATION. ASCE, 1998. http://dx.doi.org/10.1063/1.54640.
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Heinen, Dirk, Herbert Schroeder, and Werner Schilling. "In-situ TEM-investigations of mass transport in “near-bamboo” Al-interconnects due to electromigration." In STRESS INDUCED PHENOMENA IN METALLIZATION. ASCE, 1998. http://dx.doi.org/10.1063/1.54641.
Full textReports on the topic "Indice de stress"
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El Halawani, Mohamed, and Israel Rozenboim. Environmental factors affecting the decline in reproductive efficiency of turkey hens: Mediation by vasoactive intestinal peptide. United States Department of Agriculture, January 2007. http://dx.doi.org/10.32747/2007.7696508.bard.
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Reproductive failure associated with heat stress is a well known phenomenon in avian species. Increased prolactin (PRL) levels in response to heat stress have been suggested as a mechanism involved in this reproductive malfunction. To test this hypothesis, laying female turkeys were subjected to 40°C for 12 h during the photo-phase daily or maintained at 24–26°C. Birds in each group received oral treatment with parachlorophenyalanine (PCPA; 50 mg/kg BW/day for 3 days), an inhibitor of serotonin (5-HT) biosynthesis; or immunized against vasoactive intestinal peptide (VIP). Both treatments are known to reduce circulating PRL levels. Non treated birds were included as controls. In the control group, high ambient temperature terminated egg laying, induced ovarian regression, reduced plasma luteinizing hormone (LH) and ovarian steroids (progesterone, testosterone, estradiol) levels, and increased plasma PRL levels and the incidence of incubation behavior. Pretreatment with PCPA reduced (P< 0.05) heat stress-induced decline in egg production, increase in PRL levels, and expression of incubation behavior. Plasma LH and ovarian steroid levels of heat stressed birds were restored to that of controls by PCPA treatment. As in PCPA-treated birds, VIP immunoneutralization of heat-stressed turkeys reduced (P< 0.05) circulating PRL levels and prevented the expression of incubation behavior. But it did not restore the decline in LH, ovarian steroids, and egg production (P> 0.05). The present findings indicate that the detrimental effect of high temperature on reproductive performance may not be related to the elevated PRL levels in heat-stressed birds but to mechanism(s) that involve 5-HT neurotransmission and the induction of hyperthermia.
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Bold, Richard. Metabolic Stress Induced by Arginine Deprivation Induces Autophagy Cell Death in Prostate Cancer. Fort Belvoir, VA: Defense Technical Information Center, August 2009. http://dx.doi.org/10.21236/ada517565.
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Bold, Richard. Metabolic Stress Induced by Arginine Deprivation Induces Autophagy Cell Death in Prostate Cancer. Fort Belvoir, VA: Defense Technical Information Center, August 2010. http://dx.doi.org/10.21236/ada546263.
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Bold, Richard. Metabolic Stress Induced by Arginine Deprivation Induces Autophagy Cell Death in Prostate Cancer. Fort Belvoir, VA: Defense Technical Information Center, August 2011. http://dx.doi.org/10.21236/ada552112.
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Krause, Thomas, Mehrdad Keshefi, Ross Underhill, and Lynann Clapham. PR652-203801-R02 Magnetic Object Model for Large Standoff Magnetometry Measurement. Chantilly, Virginia: Pipeline Research Council International, Inc. (PRCI), September 2021. http://dx.doi.org/10.55274/r0012151.
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Ferromagnetic pipeline steel may exhibit magnetization, even in the absence of applied magnetic fields, due to remnant fields or the presence of pipe wall stress. Remnant magnetization may be present from previous or existing exposure to a magnetic field, while pipe wall stress induced magnetization can result from line pressure, environmental stresses due to settling or geohazard conditions, and residual stresses due to nonuniform plastic deformation caused by manufacturing processes, installation or operating conditions. The local stress state of the pipeline may also be altered by corrosion or damage. The physical basis for magnetization in pipelines due to intrinsic and resident stresses is examined here using the magnetic object (MO) model. MOs are characterized as regions of relatively independent magnetic behaviour, typically about the size of a ferromagnetic steel grain, to which expressions for the magnetic energy of local domain structures can be applied. The lowest energy state for an MO is a flux-closed structure, but the presence of stress can modify the MO energy through inverse magnetostrictive effects on the domain structure and thereby, produce a state of magnetization. This magnetization may be altered by the introduction of additional stress sources including pressurization of the pipe, geological-environment effects, sources of magnetization that include the proximity of other ferromagnetic pipes, even those comprising sections of the same pipeline, and changes in the pipe structure that may be brought about by deformation, corrosion or cracking. This work shows that the fundamental building block of the MO, combined with considerations of overall changes in domain structure due to these factors, can be used to model the generation of magnetic fields measured outside of pipeline structures. This will have implications for understanding sources of pipeline magnetization that are passively measured above buried oil and gas pipelines with the objective of detecting anomalous conditions that may indicate compromised conditions for safe pipeline operation.
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El Halawani, Mohamed, and Israel Rozenboim. Temperature Stress and Turkey Reproduction. United States Department of Agriculture, May 2002. http://dx.doi.org/10.32747/2002.7570546.bard.
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High temperature stress is of major concern to turkey producers in Israel and the United States. The decline in the rate of egg production at high environmental temperature is well recognized, but the neuroendocrinological basis is not understood. Our objectives were: 1) to characterize the hypothalamo-hypophyseal axis involvement in the mechanism(s) underlying the detrimental effect of heat stress on reproduction, and 2) to establish procedures that alleviate the damaging effect of heat stress on reproduction. Heat stress (40oC, Israel; 32oC, U.S.) caused significant reduction in egg production, which was restored by VIP immunoneutralization. The decline in egg production did not appear to be entirely related to the expression of incubation behavior due to the rise in circulating PRL in stressed birds. Heat stress was found to increase circulating PRL in ovariectomized turkeys independent of the reproductive stage. Active immunization against VIP was shown for the first time to up-regulate LHb and FSHb subunit mRNA contents. These findings taken together with the results that the heat stress-induced decline in egg production may not be dependent upon the reproductive stage, lead to the suggestion that the detrimental effect of heat stress on reproductive performance may be in part mediated by VIP acting directly on the GnRH/gonadotropin system. Inhibin (INH) immunoneutralization has been shown to enhance FSH secretion and induces ovulation in mammals. It is hypothesized that immunization of heat-stressed turkeys against INH will increase levels of circulating FSH and the number of preovulating follicles which leads to improved reproductive performance. We have cloned and expressed turkey INH-a and INH-bA. Active immunization of turkey hens with rtINH-a increased pituitary FSH-b subunit mRNA and the number of non-graded preovulatory yellow follicles, but no significant increase in egg production was observed.
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Meyers, M., and G. Ravichandran. Martensitic transformation induced by stress pulses. Office of Scientific and Technical Information (OSTI), March 1990. http://dx.doi.org/10.2172/6956035.
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Williams, Emma. Stress-Induced Immune Dysfunction in Students. Ames (Iowa): Iowa State University, December 2023. http://dx.doi.org/10.31274/cc-20240624-1344.
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Davis, Michael. Stress-Induced Enhancement of the Startle Reflex. Fort Belvoir, VA: Defense Technical Information Center, September 1993. http://dx.doi.org/10.21236/ada278414.
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Weitsman, Y. Residual-Stress Induced Damage in Composite Materials. Fort Belvoir, VA: Defense Technical Information Center, April 1985. http://dx.doi.org/10.21236/ada164191.
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