Dynamic properties of water in breast pathology depend on the histological compounds: distinguishing tissue malignancy by water diffusion coefficients.

Background: The parameters that characterize the intricate water diffusion in tumors may also reveal their distinct pathology. Specifically, characterization of breast cancer could be aided by diffusion magnetic resonance.The present in vitro study aimed to discover connections between the NMR biexponential diffusion parameters [fast diffusion phase (D(FDP)), slow diffusion phase (D(SDP)), and spin population of fast diffusion phase (P1)] and the histological constituents of nonmalignant (control) and malignant human breast tissue.

Spatial structure of peptides determined by residual dipolar couplings analysis.

The gated decoupled (13)C NMR spectra of a dipeptide (Glu-Trp) and a tetrapeptide (NAc-Ser-Phe-Val-Gly-OMe) were recorded in D(2)O and in a lyotropic alignment medium (pentaethylene glycol monododecyl ether/n-hexanol). The residual dipolar couplings were extracted as the differences between the observed couplings for the magnetic nuclei dissolved in the latter and former media. Using a computational optimization, the spatial structures of the compounds were calculated starting from their respective low energy conformations obtained on a semiempirical basis.

Lysine 5 and phenylalanine 9 of the factor IX omega-loop interact with phosphatidylserine in a membrane-mimetic environment.

The binding of factor IX to cell membranes requires a structured N-terminal omega-loop conformation that exposes hydrophobic residues for a highly regulated interaction with a phospholipid. We hypothesized that a peptide comprised of amino acids Gly4-Gln11 of factor IX (fIX(G4)(-)(Q11)) and constrained by an engineered disulfide bond would assume the native factor IX omega-loop conformation in the absence of Ca(2+). The small size and freedom from aggregation-inducing calcium interactions would make fIX(G4)(-)(Q11) suitable for structural studies for eliciting details about phospholipid interactions.

[Magnetic resonance tomography, angiography, and spectroscopy in acute odontogenic inflammatory diseases].

Magnetic resonance characteristics of a focus of an acute odontogenic inflammation were determined. Clear-cut characteristics of signals in various scanning modes were obtained by magnetic resonance tomo- and angiography and the potentialities of imaging the structures adjacent to the focus of odontogenic inflammation were determined. Changes in the biochemical composition of focus of inflammation in disease of different severity were determined by magnetic resonance spectroscopy and autodiffusion of water molecules.

[Markers of alteration of tissue structures as indicators of pulmonary tuberculosis activity].

Some indices that reflect the damaging processes in the cells and tissue structures have been found in 152 patients with pulmonary tuberculosis and in those with inactive lung tissue changes. There is evidence for that increases in the activity of plasma 5'-nucleotidase, ceruloplasmin/transferrin ratio and the appearance of free radical compounds in the plasma are accompaniments of active pulmonary tuberculosis. It is found that the greatest changes in these parameters are, the more acutely the disease runs, the more pronounced an exudative component in the general picture of inflammation is.