background: one of the main problems of dedicated iort accelerators is to determine dosimetric characteristics of the electron beams. monte carlo simulation of iort accelerator head and produced beam will be useful to improve the accuracy of beam dosimetry. materials and methods: liac accelerator head was modeled using the beamnrcmonte carlo simulation system. phase-space files were generated a...

The ability to use GFP-tagged proteins to perform correlative light and electron microscopy has been a desirable but elusive method. The high quantum yield of GFP that makes it excellent for fluorescence imaging also makes it extremely inefficient for production of the reactive oxygen needed to trigger formation of an electron-dense precipitate for electron microscopy. This roadblock has finall...

The two primary sites of herbicide action in photosynthetic electron transport are the inhibition of photosystem II (PS II) electron transport and diversion of electron flow through photosystem I (PS I). PS II electron transport inhibitors bind to the DI protein of the PS II reaction center, thus blocking electron transfer to plastoquinone. Inhibition of PS II electron transport prevents the co...

S.Y. Zhang Brookhaven National Laboratory, Upton, lWZ USA CWJ-j perpendicular rncident hasanangle8= O,and a range of Secondary electron (SE) production is briefly reviewed. If the collimator of the SNS storage ring allows proton beam scraping to take place, the electron yield might be quite large. At the AGS Booster, by steering the AU3’+ ion beam into the electrostatic rnflector,beam scraping ...

Increasing evidence suggests that glutamate neurotoxicity is partly mediated by reactive oxygen species, formed as a consequence of several processes, including arachidonic acid metabolism and nitric oxide production. Here we used an oxidation-sensitive indicator, dihydrorhodamine 123, in combination with confocal microscopy, to examine the hypothesis that electron transport by neuronal mitocho...

Reduction in electron transport is associated with decreased production in alpha-toxin despite the fact that Staphylococcus aureus is able to grow from 1 CFU to >10(7) CFU. Similarly, under anaerobic conditions, S. aureus does not produce alpha-toxin. Although the pathways that connect oxidative metabolism and toxin production are unknown, agents are available that exhibit greater inhibition of...