Deviations from the Friedmann-Robertson-Walker (FRW) cosmological model in the form of density inhomogeneities induce observational effects on the light propagating through these fluctuations. Using a rigorously parametrized metricwhose pseudo-Newtonian potential is related to (possibly nonlinear) density inhomogeneities through a relativistic Green function, the behavior of radiation propagati...

BACKGROUND The effect of osteoallograft repair of a Hill-Sachs lesion and the effect of allograft fit on glenohumeral translations in response to applied force are poorly understood. PURPOSE To compare the impact of a 25% Hill-Sachs lesion, a perfect osteoallograft repair (PAR) of a 25% Hill-Sachs lesion, and an "imperfect" osteoallograft repair (IAR) of a 25% Hill-Sachs lesion on glenohumera...

BACKGROUND Numerous surgical options for the management of engaging Hill-Sachs lesions exist, of which remplissage has emerged as one of the most popular arthroscopic techniques. Remplissage is not without disadvantages, however, and has been demonstrated to potentially result in a loss of external rotation (ER) due to nonanatomic tethering of the infraspinatus tendon and a potential decrease i...

BACKGROUND Introduction: GM2 is a type of ganglioside. It is associated with GM2 gangliosidoses such as Tay-Sachs disease.

The well-known Sachs and Taylor bounds provide easy inner and outer estimates for the effective yield set of a polycrystal. It is natural to ask whether they can be improved. We examine this question for two model problems, involving 3D gradients and divergence-free vector fields. For 3D gradients the Taylor bound is far from optimal: we derive an improved estimate which scales differently when...

In serum there are two classes of hexosaminidase. One of these is heat-labile and is inactive in children with Tay-Sachs disease. Serum from heterozygotes for Tay-Sachs disease has half the normal activity of the heat-labile enzyme. The heat-labile enzyme can be inactivated by heating serum diluted in buffer for 5 mm at 60 #{176}C. We have used this property to develop a reliable, fully automat...

Mr. Sachs has served on the Hospital Board as chairman of the building committee, vice-president, and a member of the executive committee. A graduate of Washington University, Mr. Sachs has been active in the promotion and advancement of the electrical industry since 1924. His company has participated in most of the major electrical developments in the St. Louis area and is known throughout the...