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The canonical ATP-dependent protease Lon participates in an assortment of biological processes in bacteria, including the catalysis of damaged or senescent proteins and short-lived regulatory proteins. Borrelia spirochetes are unusual in that they code for two putative ATP-dependent Lon homologs, Lon-1 and Lon-2. Borrelia burgdorferi, the etiologic agent of(More)
The role of the host plasminogen activation system in transmission of and invasion by Borrelia burgdorferi, the tick-borne spirochetal agent of Lyme disease, was investigated using plasminogen (Plg)-knockout mice. PLG was not detected in spirochetes from unfed ticks, but binding occurred as ticks fed on the host's blood. Plasminogen activators were derived(More)
Compound semiconductors like gallium arsenide (GaAs) provide advantages over silicon for many applications, owing to their direct bandgaps and high electron mobilities. Examples range from efficient photovoltaic devices to radio-frequency electronics and most forms of optoelectronics. However, growing large, high quality wafers of these materials, and(More)
Borrelia burgdorferi, the spirochetal agent of Lyme disease, binds plasminogen in vitro. Exogenously provided urokinase-type plasminogen (PLG) activator (uPA) converts surface-bound PLG to enzymatically active plasmin. In this study, we investigated the capacity of a B. burgdorferi human isolate, once complexed with plasmin, to degrade purified(More)
BACKGROUND The receptor for urokinase plasminogen activator (uPAR) promotes invasion by neoplastic or inflammatory cells by focusing proteolysis of urokinase to the cell surface. In pathologic conditions, soluble forms of the receptor (suPAR) are released, and activate cell receptors to promote chemotaxis. In the CNS, suPAR and other components of the(More)
Spirochetes believed to be the cause of Lyme disease were isolated from white-footed mice and white-tailed deer, the preferred natural hosts of Ixodes dammini, the tick vector. Evidence suggests that deer act as a reservoir of the disease and provide an overwintering mechanism for both spirochetes and adult ticks. Some tick larvae may acquire the spirochete(More)
The Multipurpose Security and Surveillance Mission Platform (MSSMP) system is a distributed network of remote sensors mounted on vertical-takeoff-and-landing (VTOL) mobility platforms plus portable control stations. The system is designed to provide a rapidly deployable, extended-range surveillance capability for a wide variety of security operations and(More)
An experimental skin lesion induced in rabbits by the bite of infected adult Ixodes dammini showed dense dermal interstitial inflammatory cell infiltrates composed of mononuclear cells (histiocytes and lymphocytes) and granulocytes. The prevalence of phagocytic cells in this experimental lesion motivated a study on the interactions of macrophages and(More)