We introduce a very simple open two-dimensional gel reactor for studying chemical patterns that arise in reaction-diffusion systems. The reactor consists of a thin disk-shaped layer of polyvinyl alcohol gel with one face in direct contact with a well-stirred flow reactor containing reactants of the chlorite-iodide-malonic acid system; the other face of the gel is in contact with a piece of tran...

UV-B radiation (280-315 nm) incident on the leafy liverwort Cephaloziella varians growing at Rothera Point on the Western Antarctic Peninsula was manipulated in late austral spring 1998 by screens consisting of a novel combination of plexiglass panes and polyester sheets. The screens transmitted c. 79%, 68%, 48%, 41% and 31% of daily UV-B radiation dose. Plants from under and outside the screen...

A computerized method for measuring relative coronary arterial stenosis by cinevideodensitometric analysis of 35 mm coronary arteriograms was developed and validated. Video images of projected coronary arteriographic frames were digitized into a 512 X 512 matrix (256 gray levels) by computer analysis that compared integrated contrast density measured over stenotic and normal arterial segments a...

Single screw expansion is widely used in petroleum and chemical department, energy recovery engineering, power engineering and many practical applications. Yet the problems of gas leakage in the single screw expansion seriously affect its efficiency. An experimental investigation of gas-liquid two-phase flow patterns and pressure drop inside the single screw expansion has been carried out. The ...

One of the applications of gold nanoparticles (GNPs) in medicine is radiation dose-enhancing effect. Although there are many simulations, in vitro and in vivo evidence that GNPs can enhance significantly the radiation dose effect of orthovoltage beams. These beams compared with megavoltage (MV) beams, have limited applications in radiotherapy. In order to evaluate GNPs radiosensitization perfor...

An apparatus for continuous registration of the electric field within an electrophoretic column was developed. It comprises a rectangular separation trough with an ordered array of 256 electrodes over a length of 10 em and perpendicular to the current flow. Electrodes are photoetched on a supporting glass plate from a vapor deposited thin layer of Sno 2 semiconductor (width: 6011m, height: O.ll...

Numerous systems have been used to label plants with C, which differ in design and complexity depending upon the desired experimental goals. However, most of these systems have generally been applied to greenhouse grown plants. Here, we report on a relatively simple C labeling system designed to label crops such as switchgrass (Panicum virgatum L.) grown in the greenhouse or small field plots. ...

The validation of surface-recovery methods is a pre-requisite for residual determination of cleaning effectiveness in process validation studies. These methods should be challenged in the laboratory using pilot-scale controlled conditions in order to evaluate the suitability for their intended use. Different swabbing techniques have been studied and compared with rinse method for 7 microorganis...

Aim: This study analyzed the effect of different finishing and polishing systems on the surface roughness of a microfilled (Amaris), and a nanofilled resin composite (Clearfil Majesty Esthetic) using Scanning electron microscope (SEM) analysis and surface roughness tester. Materials and Methods: Thirty five specimens of each material were prepared in a plexiglass mold (10 mm in diameter and 2 m...

The histopathology of the olfactory mucosal lesion associated with ip administration of 2,6-dichlorobenzonitrile (dichlobenil) and 3,3'-iminodipropionitrile (IDPN) has been well documented. Whether there is an olfactory deficit associated with the partial loss of the olfactory mucosa (localized around the dorsal medial meatus of the nasal cavity) has yet to be determined. Dichlobenil (100 mg/kg...