It is shown that the integrability conditions that arise in the Null Surface Formulation (NSF) of general relativity (GR) impose a field equation on the local null surfaces which is equivalent to the vanishing of the Bach tensor. This field equation is written explicitly to second order in a perturbation expansion. The field equation is further simplified if asymptotic flatness is imposed on th...

Environments for computer-aided composition (CAC), allowing generation and transformation of symbolic musical data, are usually counterposed to real-time environments or sequencers. The counterposition is deeply methodological: in traditional CAC environments interface changes have no effect until a certain ‘refresh’ operation is performed whereas real-time environments immediately react to use...

Bach JR, DeCicco A: Forty-eight years with Duchenne muscular dystrophy. Am J Phys Med Rehabil 2011;90:868Y870.

S U M M A R Y The Crandall Canyon Mine, Utah, collapse in 2007 August resulted in a total of nine fatalities. We processed data from the ALOS satellite acquired before and after the collapse to quantify surface subsidence associated with the collapse to better understand the collapse process. The deformation shows a steep V-shaped pattern of subsidence with slight asymmetry.We compare the fit o...

Il contributo indaga la Dispositio delle strutture compositive del Preludio in mi bemolle maggiore – BWV 552/1 (Clavierübung III, 1739) di Johann Sebastian Bach alla luce dell’Institutio oratoria Quintiliano. La retorica fu parte integrante dell’esperienza religiosa, culturale e musicale bachiana: partendo da questo assunto, si richiamano le precedenti letture simbolico-strutturali ed il preced...

Three sulphated polysaccharides labelled at the reducing end with three different chemical treatments [2-aminopyridine (2-AP), 8-amino-1,3,6-trisulphonic acid (ANTS) and 6-(biotinyl)-aminocaproylhydrazide (BACH)] were compared. Molecular weight, chemical composition, nuclear magnetic resonance features and anticoagulant activity expressed as activated partial thromboplastin time were studied to...

Sensory substitution devices aim at replacing or assisting one or several functions of a deficient sensory modality by means of another sensory modality. Despite the numerous studies and research programs devoted to their development and integration, sensory substitution devices have failed to live up to their goal of allowing one to "see with the skin" (White et al., 1970) or to "see with the ...

Throughout the modern history of biology, DNA has been given a front-row seat. Many biology textbooks and courses present the RNA molecule as an accessory to the DNA molecule. Although we take the roles of RNA for granted, its history is not as well known as that of DNA. Perhaps it was long overdue for a stellar RNA researcher such as James Darnell to undertake such a challenge. The book he has...