The structure of the tetrameric K+ channel from Streptomyces lividans in a lipid bilayer environment was studied by polarized attenuated total reflection Fourier transform infrared spectroscopy. The channel displays approximately 43% alpha-helical and 25% beta-sheet content. In addition, H/D exchange experiments show that only 43% of the backbone amide protons are exchangeable with solvent. On ...

We formulate and prove a de Finetti representation theorem for finitely exchangeable states of a quantum system consisting of k infinite-dimensional subsystems. The theorem is valid for states that can be written as the partial trace of a pure state |Psi/Psi| chosen from a family of subsets {Cn} of the full symmetric subspace for n subsystems. We show that such states become arbitrarily close t...

BACKGROUND Exchangeable neck stems, defined as those with a dual taper (that is, a modular junction between the femoral head and the femoral neck and an additional junction between the neck and the stem body), were introduced in THA to improve restoration of joint biomechanics (restoring anteversion, offset, and limb length) and reduce the risk of dislocation. However exchangeable necks have be...

The deposition of high levels of reactive nitrogen (N) and sulphur (S), or the legacy of that deposition, remain among the world's most important environmental problems. Although regional impacts of acid deposition in aquatic ecosystems have been well documented, quantitative evidence of wide-scale impacts on terrestrial ecosystems is not common. In this study we analysed surface and subsoil ch...

Nonparametric Bayesian models are often based on the assumption that the objects being modeled are exchangeable. While appropriate in some applications (e.g., bag-ofwords models for documents), exchangeability is sometimes assumed simply for computational reasons; non-exchangeable models might be a better choice for applications based on subject matter. Drawing on ideas from graphical models an...

Exchangeable models for vertex labeled graphs cannot replicate the large sample behaviors of sparsity and power law degree distributions observed in many network datasets. Out of this mathematical impossibility emerges the question of how network data can be modeled in a way that reflects known empirical behaviors and respects basic statistical principles. We address this question by observing ...

The use of the Mehlich-3 (M3) soil test procedure to assess plant availability numerous macro and micronutrients has become common at testing labs across US. is used for tests phosphorus (P) potassium (K) in Kansas; however, data other base cations existing methods are scarce Kansas soils. objective this study was investigate relationship between M3 ammonium acetate (AA) extractable calcium (Ca...

Soil cation exchange property (SCEP) is important in soil development and environmental buffering. However, the variations SCEP its correlation with soil-forming factors subsurface are not fully understood. In this study, we quantified surface as a function of parent material, vegetation, hillslope position, type. Fifty upland profiles from mid-subtropical China were selected. The capacity (CEC...

In addition to A1 in the crystal lattice of clay minerals, A1 in soils can be divided into two major groups viz., exchangeable and non-exchangeable. The A1 equilibrium in soils is controlled by the solubility of the solid phase A1 compounds on the one hand and the adsorption characteristics of the adsorption phase on the other. Thus for a given soil the amount of exchangeable A1 will depend on ...

A 500-MHz ‘H-NMR study on a double-stranded non-self-complementary DNA undecamer comprising a portion of the specific target site for the cyclic AMP receptor protein in thegal operon is presented. Using pre-steadystate nuclear Overhauser effect (NOE) measurements, all exchangeable imino, non-exchangeable base, methyl, and HI’, H2’ and H2” sugar proton resonances are assigned in a sequential man...