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Search Results: 1 - 10 of 4466 matches for " KLOPFER Mariana "
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Obesidade: atualiza o sobre sua etiologia, morbidade e tratamento
FRANCISCHI Rachel Pamfilio Prado de,PEREIRA Luciana Oquendo,FREITAS Camila Sanchez,KLOPFER Mariana
Revista de Nutri??o , 2000,
Abstract: As tendências de transi o nutricional ocorridas neste século direcionam para uma dieta mais ocidentalizada, a qual, aliada à diminui o progressiva da atividade física, converge para o aumento no número de casos de obesidade em todo o mundo. Isso representa aumento na morbidade e na mortalidade associadas à obesidade, já que esta é fator de risco para várias doen as como diabetes tipo II, hipertens o, doen as cardiovasculares e cálculo na vesícula biliar. A obesidade se apresenta n o apenas como problema científico e de saúde pública, porém como grande indústria que envolve o desenvolvimento de fármacos, de alimentos modificados e estratégias governamentais estimulando a prática regular de atividade física e a orienta o alimentar a fim de promover melhores hábitos. Assim, o conhecimento das causas e estratégias preventivas da obesidade é o objeto de estudo de pesquisadores de diferentes centros. Esse artigo tem como objetivo rever esses estudos, abordando o aumento na prevalência e incidência da obesidade, doen as relacionadas ao excesso de peso e os tratamentos para redu o da gordura corporal.
Obesidade: atualiza??o sobre sua etiologia, morbidade e tratamento
FRANCISCHI, Rachel Pamfilio Prado de;PEREIRA, Luciana Oquendo;FREITAS, Camila Sanchez;KLOPFER, Mariana;SANTOS, Rogério Camargo;VIEIRA, Patrícia;LANCHA JúNIOR, Ant?nio Herbert;
Revista de Nutri??o , 2000, DOI: 10.1590/S1415-52732000000100003
Abstract: the trend in nutritional transition in this century leads to an occidentalized diet, which, allied to a decrease in physical activity, results in increasing of obesity all over the world. it raises the risk of morbidity and mortality, since obesity is the first step to several diseases such as diabetes type ii, hypertension, cardiovascular and gallbladder diseases. obesity is not only a scientific and public health problem, but also an industry of pharmacos, special foods and governmental strategies to encourage people to be more active and to provide more food information in order to promote better habits. several studies all around the world discuss the causes and treatments for obesity. in this way, this paper summarizes these researches, approaching the elements associated with higher obesity incidence and prevalence, the diseases related to overweight and the treatments for reducing body fat.
Orthonormal bases of polynomials in one complex variable
D. P. L. Castrigiano,W. Klopfer
Mathematics , 2000,
Abstract: Let a sequence $(P_n)$ of polynomials in one complex variable satisfy a recurre ce relation with length growing slowlier than linearly. It is shown that $(P_n) $ is an orthonormal basis in $L^2_{\mu}$ for some measure $\mu$ on $\C$, if and o ly if the recurrence is a $3-$term relation with special coefficients. The supp rt of $\mu$ lies on a straight line. This result is achieved by the analysis of a formally normal irreducible Hessenberg operator with only finitely many nonzero entries in every row. It generalizes the classical Favard's Theorem and the Representation Theorem.
The Relationship of Sleep with Temperature and Metabolic Rate in a Hibernating Primate
Andrew D. Krystal, Bobby Schopler, Susanne Kobbe, Cathy Williams, Hajanirina Rakatondrainibe, Anne D. Yoder, Peter Klopfer
PLOS ONE , 2013, DOI: 10.1371/journal.pone.0069914
Abstract: Study Objectives It has long been suspected that sleep is important for regulating body temperature and metabolic-rate. Hibernation, a state of acute hypothermia and reduced metabolic-rate, offers a promising system for investigating those relationships. Prior studies in hibernating ground squirrels report that, although sleep occurs during hibernation, it manifests only as non-REM sleep, and only at relatively high temperatures. In our study, we report data on sleep during hibernation in a lemuriform primate, Cheirogaleus medius. As the only primate known to experience prolonged periods of hibernation and as an inhabitant of more temperate climates than ground squirrels, this animal serves as an alternative model for exploring sleep temperature/metabolism relationships that may be uniquely relevant to understanding human physiology. Measurements and Results We find that during hibernation, non-REM sleep is absent in Cheirogaleus. Rather, periods of REM sleep occur during periods of relatively high ambient temperature, a pattern opposite of that observed in ground squirrels. Like ground squirrels, however, EEG is marked by ultra-low voltage activity at relatively low metabolic-rates. Conclusions These findings confirm a sleep-temperature/metabolism link, though they also suggest that the relationship of sleep stage with temperature/metabolism is flexible and may differ across species or mammalian orders. The absence of non-REM sleep suggests that during hibernation in Cheirogaleus, like in the ground squirrel, the otherwise universal non-REM sleep homeostatic response is greatly curtailed or absent. Lastly, ultra-low voltage EEG appears to be a cross-species marker for extremely low metabolic-rate, and, as such, may be an attractive target for research on hibernation induction.
Ultrafast time resolved photo-electric emission
Thomas Juffmann,Brannon B. Klopfer,Gunnar E. Skulason,Catherine Kealhofer,Fan Xiao,Seth M. Foreman,Mark A. Kasevich
Physics , 2015,
Abstract: The emission times of laser-triggered electrons from a sharp tungsten tip are directly characterized under ultrafast, near-infrared laser excitation at Keldysh parameters $6.6< \gamma < 19.1$. Emission delays up to 10 fs are observed, which are inferred from the energy gain of photoelectrons emitted into a synchronously driven microwave cavity. ~ fs timing resolution is achieved in a configuration capable of measuring timing shifts up to 55 ps. The technique can also be used to measure the microwave phase inside the cavity with a precision below 70 fs upon the energy resolved detection of a single electron.
Fortines y pueblos en Buenos Aires del siglo XVIII: ?Una política de urbanización para la frontera?
Canedo,Mariana;
Mundo agrario , 2006,
Abstract: although the urban development in america was not exclusive of the european colonization, the foundation of towns and cities constituted a specific politics of conquest and colonial dominance. during the second half of the xviii century and under the government of the borbones, the politics established seemed to accompany the increase and growth of the cities and the towns in spanish america, and to incentivate the urbanization of the areas of frontier of their empire. two queries articulate this work. can the proposals formulated by the colonial authorities for buenos aires be located inside the urbanization politics proposed by the borbones for frontier areas in spanish america ? if this was this way, what concretion level has this politics had during the last decades of colonial bond? the establishment of towns will be studied for the case of buenos aires during the last decades of the xviii century.
Efecto del ganado sobre los niveles de polinización en especies vegetales del monte patagónico
Tadey,Mariana;
Ecolog?-a austral , 2008,
Abstract: livestock may indirectly affect plant pollination levels through changes in both plants and pollinators' assemblages. i studied the effect of livestock on the pollination level, estimated as the number of pollen tubes/style, on five frequent species of the patagonian monte desert (atriplex lampa, gutierrezia solbrigii, larrea cuneifolia, l. divaricata, monttea aphylla). in seven paddocks that share similar habitat characteristics but with different stocking rates, i counted pollen tubes per style of each species studied during four consecutive years. in general, pollination levels are affected more by variation between years than by stocking rates. only two of the five focal species showed changes in their pollination levels (e.g., pollen tubes/style) associated with changes in stocking rates. likewise, livestock did not affect the frequency of pollinator visits but affected cover of two of the studied species. the changes in cover (caused or not by livestock) affected directly and indirectly (e.g., through modification in pollinator visits frequency) pollination levels. results from the regressions and path analyses were consistent in relation to which species were more affected by livestock (e.g., gutierrezia solbrigii y monttea aphylla). additional information about pollen quality and nutritional plant resources would be necessary to better understand livestock indirect effects on pollination level.
Origen del melanocito normal y maligno
Aris,Mariana;
Acta bioqu?-mica cl?-nica latinoamericana , 2009,
Abstract: melanocytes are specialized cells that produce melanin, the most important pigment responsible for the coloration of skin, eyes and hair. the origin of melanocytes, their migration during the embryo development process from the neural crest to the epidermis, the molecular signals involved in the acquisition of both differentiated and functional states, and the issue of keeping undifferentiated reserve cells or stem cells will be discussed in this article. on the other hand, these facts will be related to the origin of melanoma, tumor pathology derived from the transformation of melanocytes. particularly, the etiology and the different models proposed to explain the origin of this disease will be discussed, especially the model of cancer stem cells.
Epidemiología molecular del virus sincicial respiratorio en pacientes pediátricos en un período de seis a?os
Viegas,Mariana;
Acta bioqu?-mica cl?-nica latinoamericana , 2011,
Abstract: human respiratory syncytial virus (hrsv) is the leading cause of acute lower respiratory tract infections (alri) in children. despite considerable efforts there is as yet no satisfactory vaccine available. in this work, nasopharyngeal aspirates taken from hospitalized children with alri were analyzed over six consecutive epidemic seasons (1999-2004). by rt-pcr, 353 positive samples for hrsv by direct immunofluorescence were subtypified. among them, 65.7% belonged to subtype a and 34.3% to subtype b. therefore, a phylogenetic analysis was performed using rflp and sequence analysis of the g-glycoprotein gene, the main neutralizing antigen. the results for a subtype, showed that there were two main restriction patterns (pa1 and pa2) and two genotypes (ga2 and ga5) cocirculating during the period studied. the phylodinamic analysis showed that there were some genetic clades which along this period of time alternated their circulation between argentina and other countries and that other clades cocirculated worldwide. the subtype b analysis enabled the description of an unusual genetic event such us a 60 nucleotide duplication. the phylodinamic analysis showed that all of these viruses, designated ba, circulated in our country during the period studied and were associated with strains reported wordlwide, showing a common ancestor which had probably been generated in a single genetic event between 1997 and 1999 in argentina. this work contributes to a better understandig of this virus evolution, giving a fundamental role to the virology laboratory in the active molecular surveillance.
La ense?anza media y la agenda de ocupación territorial del estado argentino, 1862-1945
Fiorito,Mariana;
Historia de la educaci?3n - anuario , 2012,
Abstract: the high schools that depended of the argentine state were milestones that marked, in many cities of the country, a double means of action: the territorial occupation and the modernization. these buildings represented an attempt of the national state to establish dynamic links with the inhabitants, to generate a sense of social citizenship and the feeling of belonging to a uniform nation: the argentine nation. the aim of this work is to rebuild the institutional occupation of argentine territory. the challenge is to see the path from the ideology to the actual occupation of the territory by defining the patterns of the consolidation of the national state, focusing not on the scholar architecture of buildings, but on their presence as media representing the nation-state. the methodology consists in the use, draft and analysis of a series of maps of the occupation of the territory, the expansion of transport networks and the location of the centers of different types of high schools (colegios nacionales, escuelas industriales, escuelas de artes y oficios, escuelas comerciales y escuelas normales) in the argentine territory, at three different moments in the history of the country: the project and construction of the possible republic (1862-1916), the real republic (1916-1930) and the impossible republic (1930-1945).
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