Relevance . The continuing deterioration of the state agricultural lands and natural environment in general requires a transition to conservation agriculture, which biologized crop rotations are part. purpose research is establish influence on content organic matter agrophysical properties soil arid steppe Southern Urals. Methods Field experiments laboratory analyses were carried out according ...

STUDY OBJECTIVE To identify margins of safety within which bronchoscopic Nd-YAG laser resection can be performed without damaging indwelling tracheobronchial stents. DESIGN Experimental in vitro study simulating a patient-care environment. METHODS Uncovered and covered metal Wallstent (Schneider; Zurich, Switzerland) and Dumon (Bryan Corporation; Woburn, MA) silicone stents were deployed in...

The light deficiency in the canopy is not the main factor limiting maize (Zea mays L.) production but the lower radiation use efficiency (RUE). Conservation tillage planting patterns were used to construct a sustainable agricultural system for soil protection and higher RUE. On these bases, we tried to create more uniform light distribution in crop canopy for increasing radiation use efficiency...

We discuss a general formalism for numerically evolving initial data in general relativity in which the (complex) Ashtekar connection and the Newman-Penrose scalars are taken as the dynamical variables. In the generic case three gauge constraints and twelve reality conditions must be solved. The analysis is applied to a Petrov type f1111g planar spacetime where we nd a spatially constant volume...

PURPOSE The purpose of this study was to determine the optimal power value of near addition lenses, which would create the least error in accommodative and vergence responses. METHODS We evaluated accommodative response, phoria, and fixation disparity when the subject viewed through various addition lenses at three working distances for 30 young adults (11 emmetropic, 17 myopic, and 2 hyperop...