Batch culture experiments were performed with 32 different sulfate-reducing prokaryotes to explore the diversity in sulfur isotope fractionation during dissimilatory sulfate reduction by pure cultures. The selected strains reflect the phylogenetic and physiologic diversity of presently known sulfate reducers and cover a broad range of natural marine and freshwater habitats. Experimental conditi...

1. The growth of fresh adult tissue in plasma medium suggested that plasma contained a substance active in overcoming the dormancy of adult tissues. 2. Incubation of adult chicken aorta in serum (from chickens or other species) before it was planted in a plasma medium, resulted in a much shorter lag period and a faster initial growth than that of control tissue incubated in Tyrode solution (or ...

Introduction: 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 ...

The Mg isotopic compositions of olivine, spinel, and hihonite from the Murchison carbonaceous chondrite have been determined by secondary ion mass spectrometry. The olivines exhibit only marginal effects. They have no detectable intrinsic mass fractionation; however, after correcting for mass fractionation, the mean residual 26Mg/24Mg for the five grams is slightly in excess of the terrestrial ...

Metallic copper surfaces rapidly and efficiently kill bacteria. Cells exposed to copper surfaces accumulated large amounts of copper ions, and this copper uptake was faster from dry copper than from moist copper. Cells suffered extensive membrane damage within minutes of exposure to dry copper. Further, cells removed from copper showed loss of cell integrity. Acute contact with metallic copper ...

The present study aimed to assess the relationship of soil properties in salt-affected soils. samples were collected from 14 districts Pakistan. Soil salinity and sodicity are common features arid semiarid regions. effects salt’s interactions with micronutrients have not been well studied. Therefore, saline non-saline different locations. microelements (Fe, Cu, Mn, Zn) fractionated into water-s...

In the previous paper (1) a procedure was outlined for the isolation of a highly purified, apparently crystalline, blue-green colored copper protein from horse liver. The precipitate obtained in step 8 of the isolation procedure (1), contains a number of proteins of potential biochemical interest. Two of these proteins, in addition to the copper protein, have been separated by fractionation wit...

Efficient release of fermentable sugars from the complex biomass structure such as second-generation or third-generation feedstocks by an appropriate enzymatic hydrolysis needs a prior fractionation. This process facilitates exposure more cellulose and hemicelluloses for hydrolysis. review focused on ‘green fractionation’ applying principles green chemistry bioethanol production. Besides, recen...

Proline was first determined in 1901 by Fischer (2), who isolated copper Land nn-proline dihydrates from an ester fraction of an acid hydrolysate of casein. During the ensuing three decades proline was determined essentially by this procedure in the hydrolysates of more than 50 proteins by Fischer (1901-ll), Abderhalden (1902-36), Osborne (1906-ll), and other workers. That data of satisfactory ...

Interaction between radiation and Adriamycin damage reduced the width of the shoulder of the X-ray survival curve. This effect was found to persist for at least 24 hr after Adriamycin treatment. Adriamycin did not affect radiation damage when cells were treated either before two-dose fractionation or with the drug present between X-ray exposures. Adriamycin is unique in that its major effect on...