Ahmed I. Hussein

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BACKGROUND Coxiella burnetii is the etiological agent of Q fever found worldwide. The microorganism has like other Gram-negative bacteria a lipopolysaccharide (LPS, endotoxin) in its outer membrane, which is important for the pathogenicity of the bacteria. In order to understand the biological activity of LPS, a detailed physico-chemical analysis of LPS is(More)
A lipid A - deprived lipopolysaccharide (LPS) from Coxiella burnetii (C.b.) Priscilla strain in virulent phase I was separated by steric-exclusion chromatography and high performance liquid chromatography (HPLC). The isolated O-specific polysaccharide (PS) fractions were analyzed by different physico-chemical methods and showed noticeable differences in(More)
Lipopolysaccharides (LPSs) of Chlamydophila psittaci 6BC and Chlamydophila pneumoniae Kajaani 6 contain 3-deoxy-D-manno-oct-2-ulosonic acid (Kdo), GlcN, organic bound phosphate, and fatty acids in the molar ratios of approximately 3:2:2.2:4.8 and approximately 2.9:2:2.1:4.9, respectively. The LPSs were immunoreactive with a monoclonal antibody against a(More)
This paper presents a wide tuning range mm-wave digitally controlled oscillator (DCO) with very fine frequency tuning granularity. Switched coupled-inductor and switched-capacitor banks provide the coarse tuning to achieve 24% tuning range from 48.1 GHz to 61.3 GHz. A fine frequency tuning resolution of 39 kHz is achieved using capacitive degeneration. The(More)
A lipopolysaccharide (LPS) of Chlamydia psittaci PK 5082 strain associated with enzootic abortion in ewes was isolated from embryonated hen eggs-grown elementary bodies (EBs) by a phenol/water procedure. Compositional analyses revealed the presence of 3-deoxy-D-manno-oct-2-ulosonic acid (Kdo), glucosamine (GlcN), phosphorus, and fatty acids in a molar ratio(More)