Reaction centers (RCs) from four species of purple bacteria, Rhodobacter sphaeroides, Rhodobacter capsulatus, Rhodospirillum rubrum, and the recently discovered bacterium Rhodospirillum centenum, have been characterized by optical spectroscopy [Wang, S., Lin, X., Woodbury, N. W., & Allen, J. P. (1994) Photosynth. Res. (submitted for publication)] and magnetic resonance spectroscopy. All RCs con...

BACKGROUND Long-term neurotoxicity is a frequent complication of combined radiotherapy and chemotherapy in patients with primary central nervous system lymphoma. Treatment protocols without radiotherapy have been implemented to avoid this; however, little detailed neuropsychologic and neuroradiologic data exist to assess the frequency of long-term treatment sequelae in this patient group. OBJ...

The parametric resonance of the axial vibrations of a cantilever pipe conveying harmonically perturbed two-phase flow is investigated using the method of multiple scale perturbation. The nonlinear coupled and uncoupled planar dynamics of the pipe are examined for a scenario when the axial vibration is parametrically excited by the pulsating frequencies of the two phases conveyed by the pipe. Aw...

INTRODUCTION A major obstacle in understanding the pathophysiology of lymphedema, the differentiation from other types of edema, and in treatment planing is the difficulty of visualizing lymphatic vessels in human beings [1]. Lymphoscintigraphy is the primary imaging modality. Despite recent refinements in this technology an improved depiction of the lymphatic system with high resolution is des...

Parametric amplification of magneto-inductive (MI) waves propagating in magnetically coupled chains of nonlinear L–C resonators is studied. Analysis is first presented for a three-frequency travelling wave scheme in which the signal, idler and pump all propagate as MI waves. The effect of de-coupling the idlers is then considered and it is shown that this configuration relaxes the standard phas...

in this paper we introduce the notions of uniformly quasi-primary ideals and uniformly classical quasi-primary submodules that generalize the concepts of uniformly primary ideals and uniformly classical primary submodules; respectively. several characterizations of classical quasi-primary and uniformly classical quasi-primary submodules are given. then we investigate for a ring $r$, when any fi...