Ž . Ž . Four quanta of light, absorbed by Photosystem II PS II , drive the catalytic center of oxygen evolution OEC through w x Ž . Ž . five transitions which are named S ́S to S ́S TMS 1 . Manganese Mn , tyrosine Y and a chemically 0 1 3 4 0 4 Z ill-defined compound, X, serve as redox cofactors. Transient optical absorption spectra of PS II core particles have led us to ) ) y w x propose that ...

Interferon-a (IFN-a) is considered the standard therapy for chronic myeloid leukemia (CML) patients not suitable for allogeneic stem cell transplantation. From 1987 through 1992, 195 patients in the Benelux with recent untreated CML were randomized between low-dose IFN-a2b (3 MIU, 5 days/wk) or hydroxyurea alone (control group). The white blood cell count had to be kept less than 10 3 109/L in ...

Xu Z, Prathapasinghe G, Wu N, Hwang SY, Siow YL, O K. Ischemia-reperfusion reduces cystathionine-synthase-mediated hydrogen sulfide generation in the kidney. Am J Physiol Renal Physiol 297: F27–F35, 2009. First published May 13, 2009; doi:10.1152/ajprenal.00096.2009.—Cystathionine-synthase (CBS) catalyzes the rate-limiting step in the transsulfuration pathway for the metabolism of homocysteine ...

Increased attention to the issue of aid effectiveness has sparked a flurry of empirical studies attempting to measure the macro-level impact of aid flows on the performances of developing countries. These studies yield ambiguous and even contradictory results and one possible source of confusion is the fact that they are not grounded in solid theorizing. This paper tries to remedy this lacuna b...

A hypergraph is 2-intersecting if any two edges intersect in at least two vertices. Blais, Weinstein and Yoshida asked (as a first step to a more general problem) whether every 2-intersecting hypergraph has a vertex coloring with a constant number of colors so that each hyperedge has at least min{|e|, 3} colors. We show that there is such a coloring with at most 5 colors (which is best possible...

BACKGROUND Microwave irradiation has been tried as a replacement for the conventional tissue processing technique in histopathology laboratories for quite some time. Studies have shown that Domestic Microwave Tissue Processing (DMWTP) provides a faster delivery of the tissue sections with a morphology which is similar to that which is seen Conventional Tissue Processing (CTP). But many laborato...