objective: radiation effects induced in non-irradiated cells are termed radiation-induced bystander effects (ribe). the present study intends to examine the ribe response of qu-db bystander cells to first, second and third radiation fractions and compare their cumulative outcome with an equal, single acute dose. materials and methods: this experimental study irradiated three groups of target ce...

Studies using stable-isotope analysis to infer diet require a knowledge of how stable-isotope ratios in consumer tissues are related to dietary values. We determined 6°C and VN diet-tissue fractionation factors for blood, liver, muscle, bone collagen and feathers of domestic chickens (Gallus gullus), Japanese Quail (Coturnix juponica) and Ring-billed Gulls (Lams deluwarensis) and for blood and ...

Recent advances in processing research and membrane technology have allowed for the fractionation of whey proteins directly from milk. The differences in attributes between whey proteins isolated from milk and those isolated from cheese whey are becoming an important factor for dairy protein processors considering this new avenue for fractionating whey proteins. The symposium will cover membran...

The photoabsorption cross sections of HCl and DCl are calculated using the reflection principle and time dependent wavepacket propagation methods. The absorption cross sections are compared to high precision experimental absorption cross sections from the literature and the different results given by the methods are discussed. The results of the calculations emphasize the important roles that p...

The active species of "CO(2)" and the amount of fractionation of stable carbon isotopes have been determined for a partially purified preparation of phosphoenolpyruvate (PEP) carboxylase (EC 4.1.1.31) from corn (Zea mays) leaves. The rates of the enzyme reactions, using substrate amounts of HCO(3) (-), CO(2) or CO(2) plus carbonic anhydrase, show that HCO(3) (-) is the active species of "CO(2)"...

tion, electron-dense “pegs” in the synaptic cleft can be The establishment and maintainance of synaptic asobserved emanating from thickenings of the preand sociations [is] conceived to be regulated by highly postsynaptic membranes. These universal features of specific cytochemical affinities that arise systematithe CNS synaptic junctional complex are indicative of a cally among the different ty...

We have attempted to constrain the depth(s) at which the main differentiation processes in arc lavas occur, using two main approaches; REE characteristics. The REE patterns of volcanic rock suites produced by crystal-liquid differentiation processes are sensitive to garnet or amphibole fractionation at deep or intermediate levels, respectively. Not surprisingly La/Yb increases with differentiat...

In a conventional dry grind process, corn is processed to produce ethanol and a low valued animal food coproduct called distillers dried grains with solubles (DDGS). Approximately 33% of corn in dry grind ethanol plant becomes DDGS. Due to its high fiber content DDGS has traditionally being sold as ruminant foodstuffs. New fractionation technologies are being implemented to recovery valuable co...

In order to determine and understand the stable isotope fractionation of O and N manifested during assimilation of NO−3 in marine macro-benthic algae, two species (Ulva sp. and Agardhiella sp.) have been grown in a wide range of NO−3 concentrations (2–500 μM). Two types of experiments were performed. The first was one in which the concentration of the NO−3 was allowed to drift downward as it wa...

[1] We have developed a semianalytic model for computing the photo-induced isotopic fractionation in simple molecules of interest to the atmospheric science community. The method is based on the Born-Oppenheimer approximation and the Reflection Principle. It has the main advantage of using commonly available input data, namely, the photolysis cross sections for the standard isotopologue/isotopo...