Biological nitrogen fixation (BNF) in woody plants is often investigated using foliar measurements of δ(15) N and is of particular interest in ecosystems experiencing increases in BNF due to woody plant encroachment. We sampled δ(15) N along the entire N uptake pathway including soil solution, xylem sap and foliage to (1) test assumptions inherent to the use of foliar δ(15) N as a proxy for BNF...

The goal of this paper is to derive better approximations for effective Born radii in the generalized Born model of molecular solvation by analyzing the Kirkwood-series solution of the Poisson equation for a spherical solute. The main focus is on solutes under non-conducting boundaries, where the solute dielectric constant 2in and solvent dielectric constant 2ex lead to a non-vanishing ratio δ ...

Phase differences and amplitude ratios at different colour photometric bands are currently being used to discriminate pulsation modes in order to facilitate mode identification of κ-driven non-radial pulsating stars. In addition to physical inputs (e.g., mass, T e f f , etc.), these quantities depend on the non-adiabatic treatment of the atmosphere. This paper presents theoretical results conce...

δ-secretase, also known as asparagine endopeptidase (AEP) or legumain, is a lysosomal cysteine protease that cleaves both amyloid precursor protein (APP) and tau, mediating the amyloid-β and tau pathology in Alzheimer's disease (AD). Here we report the therapeutic effect of an orally bioactive and brain permeable δ-secretase inhibitor in mouse models of AD. We performed a high-throughput screen...

We consider the coupling to gravity in 4 + δ dimensions of a non linear electroweak symmetry breaking sector, with δ compactified dimensions, and derive an effective lagrangian by integrating over the KK excitations of the graviton and of the dilaton. The effective chiral lagrangian describes the interactions of the electroweak gauge bosons and the goldstone bosons from the electroweak breaking.

An oxidative burst occurs during pregnancy due to the large consumption of oxygen in the tissues and an increase in metabolic demands in response to maternal physiological changes and fetal growth. This study aimed to determine the oxidative profile and activity of δ-aminolevulinate dehydratase (δ-ALA-D) in pregnant women who received iron supplementation. Oxidative stress parameters were evalu...

In this paper we study the shape and growth of structured pseudospectra for small matrix perturbations of the form A A∆ = A + B∆C, ∆ ∈ ∆, ‖∆‖ ≤ δ. It is shown that the properly scaled pseudospectra components converge to non-trivial limit sets as δ tends to 0. We discuss the relationship of these limit sets with μ-values and structured eigenvalue condition numbers for multiple eigenvalues.

In this paper we solve the functional equation f ( αx+ (1− α)y ) + f ( βx+ (1− β)y ) = f ( γx+ (1− γ)y ) + f ( δx+ (1− δ)y ) which holds for all x, y ∈ I, where I ⊂ R is a non-void open interval, f : I → R is an unknown function and α, β, γ, δ ∈ (0, 1) are arbitrarily fixed.

Stable carbon and nitrogen isotope signals in plant tissues integrate plant-environment interactions over long periods. In this study, we hypothesized that humid alpine life conditions are narrowing the scope for significant deviations from common carbon, water and nitrogen relations as captured by stable isotope signals. We explored the variation in δ(13)C and δ(15)N in 32 plant species from t...

We show that for every computable ordinal of the form β = δ + 2n + 1 > 1, where δ is zero or a limit ordinal and n ∈ ω, there exists a torsion-free abelian group having an X-computable copy if, and only if, X is non-lowβ .