Oxygen plasma effects on optical properties of ZnSe films" (2002). Zinc selenide is an infrared transparent semiconductor material being considered for use in space as an infrared optical coating. In this work, zinc selenide thin films of different thicknesses were exposed to an electron cyclotron resonance generated oxygen plasma, often used to ''simulate'' the low earth orbital environment. T...

Wide-bandgap semiconductors such as zinc selenide (ZnSe) have become popular for ultraviolet (UV) photodetectors due to their broad UV spectral response. Schottky barrier detectors made of ZnSe in particular have been shown to have both low dark current and high responsivity. This paper presents the results of electrical and optical characterization of UV sensors based on ZnSe/Ni Schottky diode...

The predicted amino acid sequence of human complement receptor 2 (CR2, CD21, C3d,g/Epstein-Barr virus receptor) and its genetic murine homologue are approximately 70% identical. The sequence of each consists of a linear array of 60-70 amino acid repeats designated short consensus repeats (SCRs). Although they share significant sequence identity, a major difference in the activities of these two...

The B2 antigen characterized by means of a monoclonal antibody (14) is a 140,000 Mr protein expressed only in certain stages of the differentiation of lymphocytes of the B lineage. Here we examine the relationship between B2 and the membrane complement receptor type 2 (CR2) for the complement fragment C3d (11, 12), which is also associated only with B cells. Both phenotypic markers are distribu...

Co2(CO)8 has proved a key material for the preparation of a variety of cobalt carbonyl com­ plexes. Although most of its reactions involve oxi­ dation, reduction, disproportionation or substitu­ tion [2], addition reactions are scarce. Moreover, Co2(CO)8 is one of the few compounds to form ad­ dition products with strong Lewis acids such as AlBr3 [3]. The acid adds to the oxygen atom of a bridg...

C3dg is a cleavage product of the C3 component of complement that can facilitate the coligation of the complement receptor 2 (CR2/CD21) with the BCR via C3dg/Ag complexes. This interaction can greatly amplify BCR-mediated signaling events and acts to lower the threshold for B cell activation. Although previous studies have used anti-CR2 Abs or used chimeric Ags in the context of BCR transgenic ...

Introduction: Soluble organic compounds are known to be abundant in CM carbonaceous chondrites (CC), where they comprise a complex and diverse suite of both water-, and solventextractable molecular species [1]. The soluble organic composition of the Renazzo-type meteorites, known only recently through the studies of a few CR2 finds from Antarctica, was shown to differ from that of CMs in the ov...

C3dg adducts of Ag can coligate complement receptor type 2 (CR2; CD21) and the B cell Ag receptor. This interaction significantly amplifies BCR-mediated signals in Ag-naive wild-type mice, lowering the threshold for B cell activation and the generation of humoral immune responses as much as 1000-fold. In this study we demonstrate that CR2-mediated complementation of BCR signals can also overcom...

Follicular dendritic cells (FDCs) and complement receptor (Cr)1 and complement receptor (Cr)2 are important for the generation of humoral immunity. Cr1/2 expression on B cells and FDCs was shown to provide a secondary signal for B cell activation, to facilitate transport of Ag in immune follicles, and to enhance retention of immune complexes by FDCs. We show in this study that murine B cells pr...