Raychaudhuri equation in the self-consistent Einstein-Cartan theory with spin-density

The physical implications of the Raychaudhuri equation for a spinning fluid in a Riemann-Cartan spacetime is developed and discussed using the self-consistent Lagrangian based formulation for the Einstein-Cartan theory. It was found that the spin-squared terms contribute to expansion (inflation) at early times and may lead to a bounce in the final collapse. The relationship between the fluid's vorticity and spin angular velocity is clarified and the effect of the interaction terms between the spin angular velocity and the spin in the Raychaudhuri equation investigated. These results should prove useful for studies of systems with an intrinsic spin angular momentum in extreme astrophysical or cosmological problems

Regulation of gastric acid secretion in situ by an endogenous activator protein: Studies with activator-specific antibody

Monospecific polyclonal antibody was raised against a homogenous preparation of endogenous activator protein (HAF) for the gastric H+,K+-ATPase system. Antibody was used to assess the regulatory role of the HAF in gastric acid secretion by isolated rabbit glands in situ. Immunohistochemical studies revealed aredistribution of theHAFtowards discrete intracellular zones following stimulation of the glands with histamine. The antibody, when inserted into the stimulated gastric glands by digitonin permeabilization, could effectively block the acid forming ability of the cells. The data offers, for the first time, some concrete in situ evidence for the role of the HAF as an intracellular regulator of gastric H+ transport .The manuscript was written (in the early 1990) soon after the data were collected, but never submitted to a journal with the hope of getting better gel picture and fluorescent micrograph which did not materialize due to unavoidable circumstances

Commercial users panel

The discussions of motives and requirements for telerobotics application demonstrated that, in many cases, lack of progress was a result not of limited opportunities but of inadequate mechanisms and resources for promoting opportunities. Support for this conclusion came from Telerobotics, Inc., one of the few companies devoted primarily to telerobot systems. They have produced units for such diverse applications as nuclear fusion research, particle accelerators, cryogenics, firefighting, marine biology/undersea systems and nuclear mobile robotics. Mr. Flatau offered evidence that telerobotics research is only rarely supported by the private sector and that it often presents a difficult market. Questions on the mechanisms contained within the NASA technology transfer process for promoting commercial opportunities were fielded by Ray Gilbert and Tom Walters. A few points deserve emphasis: (1) NASA/industry technology transfer occurs in both directions and NASA recognizes the opportunity to learn a great deal from industry in the fields of automation and robotics; (2) promotion of technology transfer projects takes a demand side approach, with requests to industry for specific problem identification. NASA then proposes possible solutions; and (3) comittment ofmotivated and technically qualified people on each end of a technology transfer is essential

Diabetic Microvascular Complications: Possible Targets for Improved Macrovascular Outcomes

The results of recent outcome trials challenge hypotheses that tight control of both glycohemoglobin and blood pressure diminishes macrovascular events and survival among type 2 diabetic patients. Relevant questions exist regarding the adequacy of glycohemoglobin alone as a measure of diabetes control. Are we ignoring mechanisms of vasculotoxicity (profibrosis, altered angiogenesis, hypertrophy, hyperplasia, and endothelial injury) inherent in current antihyperglycemic medications? Is the polypharmacy for lowering cholesterol, triglyceride, glucose, and systolic blood pressure producing drug interactions that are too complex to be clinically identified? We review angiotensin-aldosterone mechanisms of tissue injury that magnify microvascular damage caused by hyperglycemia and hypertension. Many studies describe interruption of these mechanisms, without hemodynamic consequence, in the preservation of function in type 1 diabetes. Possible interactions between the renin-angiotensin-aldosterone system and physiologic glycemic control (through pulsatile insulin release) suggest opportunities for further clinical investigation

Social theory, photography and the visual aesthetic of cultural modernity

Social theory and photographic aesthetics both engage with issues of representation, realism and validity, having crossed paths in theoretical and methodological controversies. This discussion begins with reflections on the realism debate in photography, arguing that beyond the polar positions of realism and constructivism the photographic image is essentially ambivalent, reflecting the ways in which it is situated within cultural modernity. The discussion draws critically on Simmel’s sociology of the visual to elucidate these issues and compares his concept of social forms and their development with the emergence of the photograph. Several dimensions of ambivalence are elaborated with reference to the politics and aesthetics of socially engaged photography in the first half of the twentieth century. It presents a case of the autonomy of the photographic as a social form that nonetheless has the potential to point beyond reality to immanent possibilities. The discussion exemplifies the processes of aesthetic formation with reference to the ‘New Vision’ artwork of László Moholy-Nagy and the social realism of Edith Tudor Hart

A New/Old Ontology of Film

The purpose of this article is to examine the ontological effects of digital technology, and determine whether digital films, traditional films, and pretraditional motion pictures belong to the same category. I begin by defining the parameters of my inquiry, and then consider the two most significant consequences of the new technology. §2 proposes a decisive refutation of the causal relationship between reality and photography. §3 identifies an end to the dominance of photorealistic film over animation, and argues for an inversion of that relationship, whereby animation is paramount. Finally, I consider the implications of these consequences for film ontology, compare theories, and conclude in favour of Berys Gaut, for whom digital film is the latest incarnation of a history of moving pictures that stretches back for centuries