Continuidade e correspondência:

Desde sua tese sobre o Romantismo alemão até as teses intitulados “Sobre o conceito de história”, Walter Benjamin questiona a ideia de continuidade, baseada numa temporalidade linear e numa lógica dedutiva. Esse questionamento passa por postulados radicais como o rompimento total com a tradição e a “explosão do continuum”, sendo que a destruição da linearidade unidirecional é compensada pela construção de modelos mais complexos como imagens e mônadas, ambas privilegiadas por Benjamin por seguirem o princípio da correspondência

Natureza e história em Walter Benjamin

Whereas the question of history is one of the most discussed issues in the work of Walter Benjamin, that of the nature occupies a secondary place in the benjaminian critique. However, this essay aims to show that with the reduction of the role of the subject in modernity, there is an increasing importance of a nature which escapes to his control. Rejecting a progressive conciet of history, the historical events seem to obey much more, for Benjamin, to processes known from the natural sciences than to the political projections of a modern society.Enquanto a questão da história é um dos temas mais discutidos na obra de Walter Benjamin, a da natureza ocupa um lugar marginal na crítica benjaminiana. No entanto, o presente ensaio procura mostrar que, com a redução do papel do sujeito na modernidade, aumenta a importância de uma natureza que escapa ao seu controle. Com a rejeição de um conceito progressista de história, os acontecimentos, para Benjamin, parecem obedecer muito mais a processos conhecidos das ciências naturais do que às projeções políticas de uma sociedade moderna

Red list and checklist of the lichens

Derzeit sind aus Berlin 315 Flechtensippen (310 Arten, 3 Unterarten, eine Varietät und eine Form) bekannt. Davon werden 112 (35,6 %) in die Rote Liste aufgenommen. 59 Taxa gelten als ausgestorben oder verschollen, 47 sind bestandsgefährdet und 6 Arten sind sehr selten. Der Vergleich mit der Vorgängerliste (Otte 2005) zeigt, dass sich bei 44 Taxa die Kategorie verändert hat, 21 Taxa erhielten einen geringeren Gefährdungsgrad, 23 einen höheren.Currently, 315 lichen taxa (310 species, 3 subspecies, 1 variety and 1 forma) are known from Berlin. The Red List contains 112 (35.6 %) of them. 59 taxa are extinct or missing, 47 are endangered and 6 species are extremely rare. Compared to the last Red List (Otte 2005) the categories of 44 taxa have changed. 21 taxa are classified into a lower category of threat, 23 taxa into a higher category

Red list and checklist of the lichenicolous fungi

Derzeit sind aus Berlin 23 lichenicole Pilzarten bekannt. Davon werden lediglich zwei ausgestorbene Arten in die Rote Liste aufgenommen. Neun Arten (39,1 %) gelten als ungefährdet. Für die Einschätzung von 12 Arten (52,2 %) sind die Daten unzureichend. Besonders die ungenügende historische Erfassung der lichenicolen Pilze macht eine Einschätzung der Gefährdung schwierig.Currently, 23 species of lichenicolous fungi are known from Berlin. The Red List contains only two extinct or at least possibly extinct species. Nine species (39.1 %) are classified as not threatened. For 12 species (52.2 %) data are not sufficient. Especially the scarcity of historical records makes an assessment difficult

Effect of local chemistry and structure on thermal transport in doped GaAs

Using a first-principles approach, we analyze the impact of \textit{DX} centers formed by S, Se, and Te dopant atoms on the thermal conductivity of GaAs. Our results are in good agreement with experiments and unveil the physics behind the drastically different effect of each kind of defect. We establish a causal chain linking the electronic structure of the dopants to the thermal conductivity of the bulk solid, a macroscopic transport coefficient. Specifically, the presence of lone pairs leads to the formation of structurally asymmetric \textit{DX} centers that cause resonant scattering of incident phonons. The effect of such resonances is magnified when they affect the part of the spectrum most relevant for thermal transport. We show that these resonances are associated with localized vibrational modes in the perturbed phonon spectrum. Finally, we illustrate the connection between flat adjacent minima in the energy landscape and resonant phonon scattering through detailed analyses of the energy landscape of the defective structures.Comment: 7 pages, 7 figure

Proteomic analysis of Daphnia magna hints at molecular pathways involved in defensive plastic responses

Background: Phenotypic plasticity in defensive traits occurs in many species when facing heterogeneous predator regimes. The waterflea Daphnia is well-known for showing a variety of these so called inducible defences. However, molecular mechanisms underlying this plasticity are poorly understood so far. We performed proteomic analysis on Daphniamagna exposed to chemical cues of the predator Triops cancriformis. D. magna develops an array of morphological changes in the presence of Triops including changes of carapace morphology and cuticle hardening. Results: Using the 2D-DIGE technique, 1500 protein spots could be matched and quantified. We discovered 179 protein spots with altered intensity when comparing Triops exposed animals to a control group, and 69 spots were identified using nano-LC MS/MS. Kairomone exposure increased the intensity of spots containing muscle proteins, cuticle proteins and chitin-modifying enzymes as well as enzymes of carbohydrate and energy metabolism. The yolk precursor protein vitellogenin decreased in abundance in 41 of 43 spots. Conclusion: Identified proteins may be either directly involved in carapace stability or reflect changes in energy demand and allocation costs in animals exposed to predator kairomones. Our results present promising candidate proteins involved in the expression of inducible defences in Daphnia and enable further in depth analysis of this phenomenon

Índices do pensamento mítico em Walter Benjamin

While disputing the supposed overcoming of myth in the modern world and the validity of the mythos-logos dichotomy, this paper suggests an approximation between the categories of mythical thought enumerated by Ernst Cassirer and the work of Walter Benjamin, represented here especially by the author’s youthful writings, which make up his philosophy of language. More precisely, other essays and books of his will be resorted to in order to suggest this thinker’s abundance of material as a profitable field for the study of myth.Contestando a suposta superação do mito na modernidade e a validade da dicotomia entre mito e logos, este artigo propõe aproximações entre as categorias do pensamento mítico enumeradas por Ernst Cassirer e a obra de Walter Benjamin, aqui representada especialmente pelos textos de juventude do autor que compõem sua filosofia da linguagem. De maneira mais pontual, recorrer-se-á, ademais, a outros ensaios e livros de sua obra, intencionando sugerir a abundância de material do pensador como um campo profícuo para o estudo do mito

LUIZ COSTA LIMA: “O muito que escrevi nos vários livros que dediquei ao assunto caberia numa só frase: por mímesis, entenda-se um processo metamórfico que contraria os padrões da realidade”.

Em 2017, Aline Magalhães Pinto (UFMG), Ana Lúcia Oliveira (UERJ) e Dau Bastos (UFRJ) desenvolveram o projeto “Luiz Costa Lima: um teórico nos trópicos”, em cujo âmbito trinta pesquisadores, vinculados a dezesseis instituições do país e do exterior, passaram inteiramente em revista os escritos do crítico. O exame se deu durante sete entrevistas públicas realizadas na UFRJ, UERJ, UFFRJ, UFF, PUC-Rio, UNIRIO e Livraria Leonardo da Vinci.A conversa multifacetada e franca aqui reproduzida ocorreu na UERJ e se ateve a achados presentes na tetralogia da mímesis: Mímesis e modernidade (1980), Vida e mímesis (1995), Mímesis: desafio ao pensamento (2000) e Mímesis e arredores (2017). Em um auditório lotado de pessoas atentas, Luiz teve como interlocutores os docentes Ana Lúcia Oliveira (UERJ), Italo Moriconi (UERJ), Fábio Lopes da Silva (UFSC) e Georg Otte (UFMG), além de pesquisadores de outras instituições

Not surgical technique, but etiology, contralateral MRI, prior surgery, and side of surgery determine seizure outcome after pediatric hemispherotomy

OBJECTIVE: We aimed to assess determinants of seizure outcome following pediatric hemispherotomy in a contemporary cohort. METHODS: We retrospectively analyzed the seizure outcomes of 457 children who underwent hemispheric surgery in five European epilepsy centers between 2000 and 2016. We identified variables related to seizure outcome through multivariable regression modeling with missing data imputation and optimal group matching, and we further investigated the role of surgical technique by Bayes factor (BF) analysis. RESULTS: One hundred seventy seven children (39%) underwent vertical and 280 children (61%) underwent lateral hemispherotomy. Three hundred forty-four children (75%) achieved seizure freedom at a mean follow-up of 5.1 years (range 1 to 17.1). We identified acquired etiology other than stroke (odds ratio [OR] 4.4, 95% confidence interval (CI) 1.1-18.0), hemimegalencephaly (OR 2.8, 95% CI 1.1-7.3), contralateral magnetic resonance imaging (MRI) findings (OR 5.5, 95% CI 2.7-11.1), prior resective surgery (OR 5.0, 95% CI 1.8-14.0), and left hemispherotomy (OR 2.3, 95% CI 1.3-3.9) as significant determinants of seizure recurrence. We found no evidence of an impact of the hemispherotomy technique on seizure outcome (the BF for a model including the hemispherotomy technique over the null model was 1.1), with comparable overall major complication rates for different approaches. SIGNIFICANCE: Knowledge about the independent determinants of seizure outcome following pediatric hemispherotomy will improve the counseling of patients and families. In contrast to previous reports, we found no statistically relevant difference in seizure-freedom rates between the vertical and horizontal hemispherotomy techniques when accounting for different clinical features between groups

Not surgical technique, but etiology, contralateral MRI, prior surgery, and side of surgery determine seizure outcome after pediatric hemispherotomy

OBJECTIVE We aimed to assess determinants of seizure outcome following pediatric hemispherotomy in a contemporary cohort. METHODS We retrospectively analyzed the seizure outcomes of 457 children who underwent hemispheric surgery in five European epilepsy centers between 2000 and 2016. We identified variables related to seizure outcome through multivariable regression modeling with missing data imputation and optimal group matching, and we further investigated the role of surgical technique by Bayes factor (BF) analysis. RESULTS One hundred seventy seven children (39%) underwent vertical and 280 children (61%) underwent lateral hemispherotomy. Three hundred forty-four children (75%) achieved seizure freedom at a mean follow-up of 5.1 years (range 1 to 17.1). We identified acquired etiology other than stroke (odds ratio [OR] 4.4, 95% confidence interval (CI) 1.1-18.0), hemimegalencephaly (OR 2.8, 95% CI 1.1-7.3), contralateral magnetic resonance imaging (MRI) findings (OR 5.5, 95% CI 2.7-11.1), prior resective surgery (OR 5.0, 95% CI 1.8-14.0), and left hemispherotomy (OR 2.3, 95% CI 1.3-3.9) as significant determinants of seizure recurrence. We found no evidence of an impact of the hemispherotomy technique on seizure outcome (the BF for a model including the hemispherotomy technique over the null model was 1.1), with comparable overall major complication rates for different approaches. SIGNIFICANCE Knowledge about the independent determinants of seizure outcome following pediatric hemispherotomy will improve the counseling of patients and families. In contrast to previous reports, we found no statistically relevant difference in seizure-freedom rates between the vertical and horizontal hemispherotomy techniques when accounting for different clinical features between groups