When visual flicker is produced by passing vertical dark bars across an illuminated field 1 with fixed inclined opaque stripes on it, certain pronounced changes are induced in the properties of the flicker contour. 2' 8 Ordinarily, with image fields not subdivided, and regardless of whether flicker is produced by sectoring the light beam at a focus 4 or by the striped cylinder technic, the depe...

The toroidal field coil system of the FIRE tokamak utilizes inertially cooled, copper alloy Bitter plate type magnets which are LN2 cooled between shots. The baseline configuration is wedged. C17510 high strength, high conductivity beryllium copper alloy developed for BPX is proposed for the conductor. These design choices were made after considering a number of alternative structural concepts ...

The case is a 2-year-old previously healthy girl with coincidental penetrating eye and brain injury. A metal rod was inserted into the skull through the upper border of the right globe. After admission and diagnostic and surgical approaches, the rod was removed under general anesthesia, and no brain hematoma or ocular and significant periocular injuries were detected. No neurologic and ophthalm...

We studied the retinal cone bipolar cells of Carollia perspicillata, a microchiropteran bat of the phyllostomid family. Microchiroptera are strongly nocturnal, with small eyes and rod-dominated retinae. However, they also possess a significant cone population (2-4%) comprising two spectral types, which are hence the basis for daylight and color vision. We used antibodies against the calcium-bin...

We investigated the impact of rod-bipolar signal transfer on visual sensitivity. Two observations indicate that rod-rod bipolar signal transfer is nonlinear. First, responses of rods increased linearly with flash strength, while those of rod bipolars increased supralinearly. Second, fluctuations in the responses of rod bipolars were larger than expected from linear summation of the rod inputs. ...

PURPOSE Melatonin's function in human vision is far from understood, in part because of the lack of information on its cellular targets. Therefore, expression and localization of the MT(1) melatonin receptor in human retina was examined. METHODS Postmortem nonpathologic human eyes from nine donors were investigated, three by reverse transcription-polymerase chain reaction (RT-PCR) for MT(1) a...

The motion of a slender axisymmetric rod-like particle is investigated theoretically for translation through a quiescent second-order fluid and for rotation in a simple shear flow of the same material. The analysis consists of an asymptotic expansion about the limit of rheologically slow flow, coupled with an application of a generalized form of the reciprocal theorem of Lorentz to calculate th...

The retina responds to a wide range of light stimuli by adaptation of retinal signaling to background light intensity and the use of two different photoreceptors: rods that sense dim light and cones that sense bright light. Rods signal to rod bipolar cells that receive significant inhibition from amacrine cells in the dark, especially from a rod bipolar cell-activated GABAergic amacrine cell. T...

The main task of mechanical engineering is to organize the production a range machines meet needs all industries. These are power, transport, lifting and transport units, agricultural machinery, construction industry, etc. Among them, one can single out devices in which relative movement their parts assigned, that is, kinematic pairs included calculation models. real operating conditions varied...