E. E. Johnson

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Routing and related resource allocation issues present special challenges in ad hoc networks. Typically, every node in an ad hoc network serves as a router for other nodes, and paths from source to destination often require multiple hops. Compared to wired networks, wireless ad hoc networks have less bandwidth, longer paths, and less stable connectivity,(More)
The tremendous storage space required for a useful data base of memory reference traces has prompted a search for trace compaction techniques. PDATS is the standard trace format used in the NMSU TraceBase, a widely used archive of memory and instruction traces. The PDATS family of trace compression techniques achieves trace coding densities of about six(More)
The motion responses of thirty fresh-frozen cadaver tibiotalar joints were measured for applied anterior-posterior force, inversion-eversion moment, and internal-external rotary torque. The load-motion response curves obtained after sectioning the anterior talofibular ligament were compared with those for intact specimens in three positions of flexion of(More)
Mu-opioid receptor activation underpins clinical analgesia and is the central event in the abuse of narcotics. Continued opioid use produces tolerance to the acute effects of the drug and adaptations that lead to physical and psychological dependence. Continued mu-receptor signaling provides the engine for these adaptations, with most evidence suggesting(More)
BACKGROUND There is evidence to suggest that the midbrain periaqueductal grey (PAG) has a role in migraine and the actions of the anti-migraine drug sumatriptan. In the present study we examined the serotonergic modulation of GABAergic and glutamatergic synaptic transmission in rat midbrain PAG slices in vitro. RESULTS Serotonin (5-hydroxytriptamine,(More)
BACKGROUND Clostridium difficile (CD) has increasingly become recognised as a significant international health burden, often associated with the healthcare environment. The upsurge in incidence of CD coincided with the emergence of a hypervirulent strain of CD characterized as 027. In 2010, 8 cases of CD 027 infections were identified in Italy. Since then,(More)
INTRODUCTION Salmonella enterica ssp. arizonae is an uncommon human pathogen with serious infections reported in immunocompromised hosts. In Europe, only a few cases have been described. Patients with this infection usually have a history of contact with reptiles or travel abroad. We present a case report of infection in a patient with hypoglobulinemia and(More)
Sensory neurons are a major site of opioid analgesic action, but the effect of chronic morphine treatment (CMT) on mu-opioid receptor function in these cells is unknown. We examined mu-opioid receptor modulation of calcium channel currents (I(Ca)) in small trigeminal ganglion (TG) neurons from mice chronically treated with morphine and measured changes in(More)
BACKGROUND HIV infection is a risk factor for Clostridium difficile infection (CDI) yet the immune deficiency predisposing to CDI is not well understood, despite an increasing incidence of CDI among such individuals. We aimed to estimate the incidence and to evaluate the risk factors of CDI among an HIV cohort in Italy. METHODS We conducted a(More)
Studies of chromosome and genome biology often focus on condensed chromatin in the form of chromosomes and neglect the non-dividing cells. Even when interphase nuclei are considered, they are often then treated as interchangeable round objects. However, different cell types can have very different nuclear shapes, and these shapes have impacts on cellular(More)