Siphoneugena Berg (Myrtaceae) é um pequeno gênero eugenióide segregado de Eugenia por Berg. A investigação fitoquímica de Siphoneugena densiflora foi realizada com o objetivo de se descobrir metabólitos secundários que possam ser considerados marcadores quimiotaxonômicos e auxiliar na distinção entre os dois gêneros. Cinco taninos hidrolisáveis inéditos foram isolados do extrato metanólico da c...

Integrins are unusual signalling proteins that function to signal both from the extracellular environment into cell, but also cytoplasm external of cell. The intracellular cascades associated with integrin activation focus on protein kinase activities, such as focal adhesion and Src. Based this association between signals activity, we have chosen include integrins in 'Catalytic receptors' secti...

and we know that this ring is isomorphic to Z or an order O in an imaginary quadratic field K; in fact, the ring on the right is equal to Z or O (viewed as a subring of C).1 To simplify the discussion, we shall treat the isomorphism in (1) as an equality and view elements of End(EL) as elements of Z or O. How might we construct an elliptic curve with endomorphism ring O? An obvious way is to us...

Polarizabilities, dispersion coefficients, and long-range atom-surface interaction potentials are calculated for the n = 2 triplet and singlet states of helium using highly accurate, variationally determined, wave functions. PACS numbers: 34.20.Cf, 32.10.Dk, 34.50.Dy Typeset using REVTEX 1 The advent of doubled basis sets has made it possible to calculate precisely many properties of two-electr...

Many extensions of the minimal supersymmetric standard model contain superfields for quarks which are singlets under weak isospin with electric charge −1/3. We explore the possibility that such isosinglet quarks have low or intermediate scale masses, but do not mediate rapid proton decay because of a discrete symmetry. By imposing the discrete gauge anomaly cancellation conditions, we show that...

in an electrically anisotropic media, current density  is not aligned with the electric field  and varies with the e-field direction. this can be considered as the spatial aliasing effects aroused by the subsurface structures whose individual dimensions are smaller than the inductive length scale of diffusively propagating em fields. the role of these structures is particularly significant in t...

Introduction: Sepsis-associated encephalopathy (SAE) is a state of acute brain dysfunction in response to a systemic infection. We propose that systemic inflammation during sepsis causes increased adhesion of leukocytes to the brain microvasculature, resulting in blood-brain barrier dysfunction. Thus, our objectives were to measure inflammatory analytes in plasma of severe sepsis patients to cr...

The pathogenesis of Alzheimer's disease is characterized by the aggregation and fibrillation of amyloid peptides Aβ(1-40) and Aβ(1-42) into amyloid plaques. Despite strong potential therapeutic interest, the structural pathways associated with the conversion of monomeric Aβ peptides into oligomeric species remain largely unknown. In particular, the higher aggregation propensity and associated t...