The role of high-altitude (Z > 200~~) tracer,stars in determining the Galactic disk potential is systematically analyzed. It is shown that such tracers cannot, by themselves, be used to measure the missing mass in the disk. Up to 60% of the disk mass may be in unobserved components with only a 20% discrepancy between the measured high-altitude disk potential and what could be expected from the ...

The diseases of white matter compose essentially three nosological entities of a heterogeneous group. The clinical and neuropathological attention has been directed to the deficiency of myelin in more or less specific patterns and distribution as the primary characteristic, and the unique natural history and the respective cellular pathology as the modifiers which define each disease. Basically...

Changes in dispersion or concentration of pigment within melanophores of vertebrates have been studied chiefly by the use of tlie microscope, and as a scale of measurement the melanophore index of Slome and Hogben ('28) has been adopted widely. This system has the disadvantage of being arbitrary and incapable of detecting slight movements of pigment which may well prove to be significant. Of se...

Several types of liposomes were used to enrich Artemia nauplii in vitamin A, vitamin C and free methionine. In a first experiment, unilamellar liposomes formulated with krill phospholipid extract and retinyl palmitate demonstrated their capability to enhance the retinol content of Artemia nauplii. Furthermore, the increase in retinol was related to the amount of retinyl palmitate included in th...

t h e s p e c i a l c o n c e n t r i c a l l y b r a c e d f r a m e (s c b f) i s a c o m m o n t y p e o f s t e e l s t r u c t u r a l s y s t e m f o r r e s i s t i n g l a t e r a l l o a d i n g. t h i s t y p e o f s y s t e m p r o v i d e s t h e r e q u i r e d s t i f f n e s s a n d s t r e n g t h a t r e l a t i v e l y l o w c o s t. d e s i g n c o d e s, b a s e d o n p a s ...

The aim of the present investigation was to obtain a picture of the photomechanical changes in the retina of a cyclostome to lay alongside the results of a number of workers on the other vertebrate groups. The question as to whether the cyclostomes are to be considered a primitive group or as degenerate offshoots from another stock appears to be still open. The interest of investigators on both...

Human immunodeficiency virus (HIV) disease is sub-Saharan Africa generally differs from that observed in the United States and other developed countries in that the risk of seroconversion after exposure is greater and the rate of disease progression to AIDS and death is faster. One theory that could in part explain this difference is the increased state of immune activation associated with a re...

-The present study examined the reliability and validity of the 15-item Breskin Rigidity Scale. Two samples of UK adults (n=216; n=277) completed the rigidity scale alongside the Wilson-Patterson Attitude Inventory and the trait measure of the Sandler-Hazari Obsessionality Inventory. Satisfactory reliability coefficients were obtained for the rigidity scale in both samples. A principal componen...