A method is described for the cryofixation of biological specimens for ultrastructural analysis and immunocytochemical detection studies. The method employs plunge freezing of specimens in a sealed capillary tube into a cryogen such as liquid propane or liquid nitrogen. Using this method a number of single-cell test specimens were well preserved. Also multicellular organisms, such as Caenorhabd...

A new, high-field side scanning probe has been added to Alcator C-Mod's complement of edge diagnostics. The WASP is designed to provide all the benefits of a linear plunge, multi-electrode scanning probe while working from the confined space of the inner tokamak wall. The drive mechanism is an embedded coil which produces a torque with the ambient toroidal magnetic field when energized, thus al...

remind the inhabitants of this country that the water in which they enjoy so frequently the refreshing effects of a "plunge wash" is drawn from polluted sources; stores of water collected from surface drainage?water that has passed over soil laden with dead animal and vegetable products, and hence loaded with millions of enemies to human life. It is palpably more poisonous during, and after, th...

Flexible flapping wings have garnered a large amount of attention within the micro aerial vehicle (MAV) community: a critical component of MAV flight is the coupling of aerodynamics and structural dynamics. This paper presents a computational framework for simulating shell-like wing structures flapping in incompressible flow at low Reynolds numbers in both hover and forward flight. The framewor...

The goal of this work is to develop low order dynamical systems models for the unsteady lift and drag forces on small wings in various modes of flight, and to better understand the physical characteristics of unsteady laminar separation. Velocity field and body force data for a flat plate at static angle of attack and in sinusoidal pitch and plunge maneuvers are generated by 2D direct numerical...

The importance of the site of stimulation to the initiation of sustained ventricular tachyarrhythmias was determined in 24 adult mongrel dogs. Studies were performed 3-30 days after two-stage occlusion of the midor distal left anterior descending coronary artery, modified by a reperfusion stage. Unipolar cathodal stimuli of twice-threshold intensity and 2 msec duration were introduced at five t...