A novel norsesquiterpene, named norcyperone (1), and three known compounds: (-)-clovane-2,9-diol (2), rosenonolactone (3), and 5 alpha,8 alpha-epidioxy-(20S,22E,24R)-ergosta-6,22-dien-3beta-ol (4) were isolated from the rhizomes of Cyperus rotundus L. The structure of 1 was elucidated as 8,11,11-trimethylbicyclo[5.3.1]undecane-5 alpha, 8 alpha-epoxy-3-one on the basis of extensive spectroscopic...

While seeking conditions for single crystals of human alpha-L-iduronidase, solutions were discovered (pH 3.0-8.5 containing calcium or zinc salts) that transform soluble alpha-L-iduronidase to a solid aggregate. This aggregate is a spherulite of semi-crystalline protein. The X-ray diffraction pattern and ability to bind Congo red characterize the alpha-L-iduronidase spherulite as 'amyloid-like'...

The Siddon algorithm is one of the radiological ray path calculation tools used in 3D image reconstruction medical imaging. In algorithm, a set alpha-parametric values computed containing length and index where voxel array x-ray intersects x-y-z axes. alpha-set creation section elements are sorted from small to large, but some have been noticed same value simulations. These calculate which voxe...

In this study we present results of the dynamic compression $\ensuremath{\alpha}$-cristobalite up to a pressure 106 GPa with use diamond anvil cell. X-ray diffraction images were recorded at different ramp and decompression rates investigate in situ high-pressure phase transitions $\ensuremath{\alpha}$-cristobalite. Our suggest that onset transformation cristobalite II, X-I, ultimately seiferti...

Segment match modeling uses a data base of highly refined known protein X-ray structures to build an unknown target structure from its amino acid sequence and the atomic coordinates of a few of its atoms (generally only the C alpha atoms). The target structure is first broken into a set of short segments. The data base is then searched for matching segments, which are fitted onto the framework ...

The angular distribution of alpha particles with respect to the spin direction of the residual nuclei is used to probe the shapes of the emitting systems. Two compound systems have been studied: ' Yb and " Sn. Deformed emission shapes are required in order to understand the alpha-gamma correlations in the ' Yb system, but not for the " Sn compound system. These conclusions are identical to thos...

Parallel to the experimental work on the study of nuclear decay schemes and other problems in nuclear spectroscopy, continuous work has been devoted to the perfection of the spectroscopic instruments. Much of the earlier experimental investigations could be performed with rather simple and sometimes even crude techniques but such cases are becoming increasingly rare. The remaining problems gene...