Isolation and properties of trypsin inhibitors from the seeds ofLupinus luteus andL. polyphyllus

From dormant seeds of European yellow lupin (Lupinus luteus) and Washington lupin (Lupinus polyphyllus) inhibitors have been isolated that effectively suppress the activity of trypsin and interact nonstochiometrically with chymotrypsin. From their physicochemical properties and aminoacid compositions, the inhibitors from the species of lupin investigated belong to different types.V. F. Kuprevich Institute of Experimental Botany, Belarusian Academy of Sciences, Minsk. A. N. Bakh Institute of Biochemistry, Russian Academy of Sciences, Moscow. Translated from Khimiya Prirodnykh Soedinenii, No. 6, pp. 879–884, November–December, 1993.     

State of Nickel in Solid Solutions of Complex Bismuth Niobates with the Pyrochlore-type Structure

Magnetic behavior of nickel atoms in diamagnetic complex bismuth niobates having the pyrochlore-type crystal structure and magnesium and zinc in niobium sites was studied. It was found that the nature of the bivalent metal atoms essentially affects the nickel state and the character of exchange interactions.     

Isolation and properties of trypsin inhibitors from the seeds ofLupinus luteus andL. polyphyllus

From dormant seeds of European yellow lupin (Lupinus luteus) and Washington lupin (Lupinus polyphyllus) inhibitors have been isolated that effectively suppress the activity of trypsin and interact nonstochiometrically with chymotrypsin. From their physicochemical properties and aminoacid compositions, the inhibitors from the species of lupin investigated belong to different types.     

Two-photon multiterm nonadiabatic transitions

The resonance Raman scattering phenomenon via the predissociated state is described in the four crossing terms A-(1, 2)-B model when terms 1 and 2 strongly interact. The Green's function closed representation for the coupled intermediate electronic terms 1 and 2 is obtained. The transition amplitude I _{A-(1, 2)-B} is found in the WKB approximation. The resonance Raman scattering via the predissociated ³Π_Ou ⁺ state of the interhalogen molecules is treated in detail.     

The influence of ultrashort excitations on the vibrational dynamics in a diatomic molecule

The problem of vibrational wave packet dynamics in the system of two electronic states of a diatomic molecule, where the states are coupled by infinitely short light pulses, is solved. The electronic states were modeled by shifted harmonic oscillators with different frequencies. Exact expressions for the probability densities of the wave packets in the ground and excited states were derived. The spatial, spectral, and temporal characteristics of the wave packets, namely, the range of motion, spatial width, mean energy, spectral width (the mean number of vibrational states in a wave packet), and the autocorrelation function, were calculated as functions of the molecular parameters (the frequency ratio and the distance between the potential minima) and of the delay time between the light pulses. The possibility of controlling the mean energy and spectral width of the wave packets in the ground electronic state by varying the delay time is considered. It was shown that "squeezed" wave packets can be prepared in the ground electronic state if the upper electronic state is shallow.     

Oscillations of a body filled with a viscous fluid

The oscillations of a physical pendulum containing a spherical cavity filled with an incompressible viscous liquid were discussed in [1]. In this paper we consider the mote general problem of the motion of an axially symmetric solid with a spherical cavity filled with an incompressible viscous fluid and moving about a fixed point. It is assumed that the center of the cavity and the fixed point lie on the axis of symmetry of the body.     

Diffusion-Weighted Magnetic Resonance Imaging in an Ultra-Low Magnetic Field

Magnetic resonance imaging is well known as a highly effective technique of medical visualization. One of its relatively new approaches is diffusion imaging. As a rule, the majority of magnetic resonance investigations in biology and medicine tends to be carried out in high magnetic fields (1.5 T and higher), but there are some advantages of the same experiments in low magnetic fields. It can be strongly useful, for example, for designing and testing new pulse sequences, training operators of magnetic resonance imagers, making new phantoms (model objects). In this study, diffusion-weighted imaging experiments in a low magnetic field 7 mT are performed in the first time. Nevertheless, this field is about two orders of magnitude bigger than an extremely low Earth field, and so concomitant gradients and polarization problems do not arise. In particular, diffusion weighted images of combined model samples (phantoms) are presented.