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Search Results: 1 - 10 of 612 matches for " Elke;Eik "
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Influência de pré-influência de pré-tratamentos sobre a desidrata??o osmótica de carambolas
Shigematsu, Elke;Eik, Nenis Maria;Kimura, Mieko;Mauro, Maria Aparecida;
Ciência e Tecnologia de Alimentos , 2005, DOI: 10.1590/S0101-20612005000300024
Abstract: osmotic dehydration (od) of star fruit (averrhoa carambola l.) in sucrose solution was studied, aiming at optimizing the process. at a first set of trials, edible coating (pectin or pectin+starch) was applied on the slices followed by od (50%, w/w, 27°c). on a second set of trials, the coatings partial drying in the oven, before od, was also assessed. at a third set of trials, the addition of the cacl2 in the osmotic solution itself was tested. the pectin based and pectin+starch based coatings, moist or oven-dried before the osmotic dehydration, were not viable on the process efficiency improvement (maximum water loss/solute gain) due to the high moisture retention and the easy sucrose impregnation of them. the vegetal tissue, uncoated, restrained more of the solute transfer and allowed a higher water output. the use of 0.04m cacl2 concentration in the sucrose osmotic solution itself improved the process efficiency slightly in relation to the solution without salt. these pre-treatments also yielded positive results on the sensorial evaluation of the air-dried (60 and 70°c) star fruit slices, in comparison with the non-treated fruit, and the best temperature was 60°c
Titanium dioxide nanoparticles induce oxidative stress and DNA-adduct formation but not DNA-breakage in human lung cells
Kunal Bhattacharya, Maria Davoren, Jens Boertz, Roel PF Schins, Eik Hoffmann, Elke Dopp
Particle and Fibre Toxicology , 2009, DOI: 10.1186/1743-8977-6-17
Abstract: Titanium dioxide (TiO2) has several isoforms of which anatase is the most commercially used type. To date, no parameter for the average ambient air concentration of TiO2 nanoparticles have been set by any regulatory agency. For the finer particles American conference of governmental industrial hygienists (ACGIH) has assigned TiO2 a threshold limit value of 10 mg/m3 (total dust) as a time weighted average for a normal 8 h workday and a 40 h workweek [1]. Occupational exposure to TiO2 nanoparticles can occur during manufacturing/use of these particles as pigments for paints, varnishes, enamels, lacquers and paper coatings to impart whiteness, opacity and brightness [2]. Exposures can also occur from their use in cosmetics such as in sunscreens, dusting powder, ointments and from radioactive decontamination of the skin. The small size of the nanoparticles provides them with special properties such as high surface to volume ratio and high surface charge. The surface charge is one of the major physical properties of the nanoparticles that play a major role in their industrial application. It can only be measured indirectly through the zeta potential which is a function of the surface charge of the particle or any adsorbed layer at the interface and the nature and composition of the surrounding medium in which the particle is suspended. The zeta potential however, gives no information on the elemental composition of the surface [3].Similar to TiO2-NP, hematite nanoparticles (Fe2O3-NP), which were used in the present study for comparison, have several industrial uses such as the magnetic layer of storage devices in computers and pigments for paints. Hematite is the mineral form of Iron(III) oxide (Fe2O3), has an iron content of about 70% and is one of the most important industrial used iron oxide beside magnetite (Fe3O4). Recently, Fe2O3-NP have been used for drug targeting cancer cells [4] and for labelling and tracking target cells using imaging techniques like magnetic
Entre aversion et nostalgie Between aversion and nostalgia. Immigration and Integration of Polish Jews from 1968 in Israel – an Interview Analysis and Documentation Film
Eik D?dtmann
Bulletin du Centre de Recherche Fran?ais de Jérusalem , 2012,
Abstract: Dans cet article, l’auteur élabore et met en relief les mécanismes d’une migration forcée des Juifs polonais par le gouvernement polonais en Isra l entre 1968 et 1971. L’auteur a interviewé plus d’une douzaine de Juifs polonais nés avant et après la Shoah. Les interviews ont été faits devant et derrière la caméra. Quelques-uns d’entre eux ont été intégrés dans le documentaire There is no return to Egypt (45 minutes) ainsi que des scènes de la vie quotidienne des migrants. Les analyses et les évaluations tirées des résultats des interviews par l’auteur se basent sur l’ uvre de Salman Akhtar, un psychologue spécialiste de la migration.L’analyse a révélé d’une part, que le chagrin et la ranc ur liés à la perte de la patrie et la confrontation avec un processus douloureux d’intégration dominent jusqu’à aujourd’hui chez les soixante-huitards , d’autre part, que le statut privilégié des migrants juifs européens en Isra l, la période favorable d’immigration et le niveau d’éducation du plus grand nombre contribuent à une image de soi positive et à une bonne intégration de ce groupe de migrants dans le projet sioniste. In this paper the author works out and illustrates the mechanisms of a forced migration of the Polish-Jewish migration cohort into the State of Israel between the years 1968 and 1971. The author interviewed over a dozen Polish Jews, born before and after the Shoah, in front and behind the camera. Some of the statements, together with scenes from everyday life of the migrants, were used in his 45-minute documentary film "There is no return to Egypt". The findings from the interviews were analysed and evaluated on the basis of the work of Salman Akhtar, a psychological researcher in the field of migration. The analysis reveals that, on the one hand, grief and anger about the loss of the Polish homeland and having to face a painful process of integration are prevailing among the ’1968ers’ up to date. On the other hand, the previliged status as European Jewish migrants in Israel, the favorable period of immigration and the educational background of the cohort all contribute to the positive self-perception and the sociological success as migrant group in the Zionist project.
Moduli in General $SU(3)$-Structure Heterotic Compactifications
Eirik Eik Svanes
Mathematics , 2014,
Abstract: In this thesis, we study moduli in compactifications of ten-dimensional heterotic supergravity. We consider supersymmetric compactifications to four-dimensional maximally symmetric space, commonly referred to as the Strominger system. The compact part of space-time $X$ is a six-dimensional manifold of what we refer to as a heterotic $SU(3)$-structure. We show that this system can be put in terms of a holomorphic operator $\bar D$ on a bundle $\mathcal{Q}=T^*X\oplus\mathrm{End}(TX)\oplus\mathrm{End}(V)\oplus TX$, defined by a series of extensions. We proceed to compute the infinitesimal deformation space of this structure, given by $T\mathcal{M}=H^{(0,1)}(\mathcal{Q})$, which constitutes the infinitesimal spectrum of the four-dimensional theory. In doing so, we find an over counting of moduli by $H^{(0,1)}(\mathrm{End}(TX))$, which can be reinterpreted as $\mathcal{O}(\alpha')$ field redefinitions. We next consider non-maximally symmetric domain wall compactifications of the form $M_{10}=M_3\times Y$, where $M_3$ is three-dimensional Minkowski space, and $Y=\mathbb{R}\times X$ is a seven-dimensional non-compact manifold with a $G_2$-structure. Here $X$ is a six dimensional compact space of half-flat $SU(3)$-structure, non-trivially fibered over $\mathbb{R}$. By focusing on coset compactifications, we show that the compact space $X$ can be endowed with non-trivial torsion, which can be used in a combination with $\alpha'$-effects to stabilise all geometric moduli. The domain wall can further be lifted to a maximally symmetric AdS vacuum by inclusion of non-perturbative effects. Finally, we consider domain wall compactifications where $X$ is a Calabi-Yau. We show that by considering such compactifications, one can evade the usual no-go theorems for flux in Calabi-Yau compactifications, allowing flux to be used as a tool in such compactifications, even when $X$ is K\"ahler.
Imaging of gastroenteropancreatic neuroendocrine tumors
Eik Hock Tan, Cher Heng Tan
World Journal of Clinical Oncology , 2011,
Abstract: Imaging of gastroenteropancreatic neuroendocrine tumors can be broadly divided into anatomic and functional techniques. Anatomic imaging determines the local extent of the primary lesion, providing crucial information required for surgical planning. Functional imaging, not only determines the extent of metastatic disease spread, but also provides important information with regard to the biologic behavior of the tumor, allowing clinicians to decide on the most appropriate forms of treatment. We review the current literature on this subject, with emphasis on the strengths of each imaging modality.
Exploring new frontiers in molecular imaging: Emergence of Ga PET/CT
Eik Hock Tan, Soon Whatt Goh
World Journal of Radiology , 2010,
Abstract: Since US Food and Drug Administration approval of 18-fluorodeoxyglucose as a positron tracer, and the development of hybrid positron emission tomography/computed tomography machines, there has been a great increase in clinical application and progress in the field of nuclear molecular imaging. However, not underestimating the value of 18F, there are known limitations in the use of this cyclotron-produced positron tracer. We hence turn our focus to an emerging positron tracer, 68Ga, and examine the advantages, current clinical uses and potential future applications of this radioisotope.
Connections, Field Redefinitions and Heterotic Supergravity
Xenia de la Ossa,Eirik Eik Svanes
Mathematics , 2014, DOI: 10.1007/JHEP12(2014)008
Abstract: We study heterotic supergravity at $\mathcal{O}(\alpha')$, first described in detail in 1989 by Bergshoeff and de Roo. In particular, we discuss the ambiguity of a connection choice on the tangent bundle. It is well known that in order to have a consistent supergravity with supersymmetry transformations given in the usual way, this connection must be the Hull connection at $\mathcal{O}(\alpha')$. We consider deformations of this connection corresponding to field redefinitions, and the necessary corrections to the supersymmetry transformations. We also discuss possible extensions of this theory to higher orders in $\alpha'$. We are interested in the moduli space of such field redefinitions which allow for supersymmetric solutions to the equations of motion. We show that for solutions on $M_4\times X$, where $M_4$ is Minkowski and $X$ is compact, this is given by $H^{(0,1)}(X,{\rm End}(TX))$. This space corresponds to infinitesimally close connections for which the equations of motion are satisfied. The setup suggests a symmetry between the gauge connection and the tangent bundle connection, as also employed by Bergshoeff and de Roo. We propose that this symmetry should be kept to higher orders in $\alpha'$, and propose a natural choice for the corresponding tangent bundle connection used in curvature computations.
Espacio público
ARQ (Santiago) , 2007, DOI: 10.4067/S0717-69962007000100006
Abstract: the actual prestige of the private sector, the politically correct but devalued public sector, and the absence of shades in the distinctions between both makes the definition of a code urgent that will ensure the continuity of public spaces in the city. bernardo secchi has said that public space is where "one is in public." do the ordinances reflect this?
Differences of weighted composition operators between weighted Banach spaces of holomorphic functions and weighted Bloch type spaces
Cubo (Temuco) , 2010, DOI: 10.4067/S0719-06462010000200002
Abstract: we consider analytic self-maps ??1,? ?2 of the open unit disk as well as analytic mapsψ 1, ψ2. these maps induce differences of weighted composition operators acting between weighted banach spaces of holomorphic functions and weighted bloch type spaces. in this article we give necessary and sufficient conditions for such a difference to be bounded resp. compact.
Integral composition operators between weighted Bergman spaces and weighted Bloch type spaces
Cubo (Temuco) , 2012, DOI: 10.4067/S0719-06462012000100002
Abstract: we characterize boundedness and compactness of integral composition operators acting between weighted bergman spaces av,p and weighted bloch type spaces bw.
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