Laurie Gibson

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A decreased red blood cell mass (RBCM) and plasma volume (PV) have been consistently found in humans after return from spaceflight. Rats flown on the Spacelab Life Sciences-1 mission were studied to assess changes in RBCM, PV, erythropoiesis, and iron economy. The RBCM and PV increased in both ground control and flight animals as expected for growing rats.(More)
Thymus, spleen, inguinal lymph node, and bone marrow specimens from rats flown on the 14-day Spacelab Life Sciences-2 mission were examined after staining of tissue sections. The primary observation was a transient retrogressive change in lymphatic tissues in the rats within a few hours after landing. There was a diffuse increase in tingible body-containing(More)
The white blood cell (WBC) elements and the bone marrow myeloid progenitor cell populations were analyzed to ascertain adaptation to micro-gravity and subsequent readaptation to 1 G in rats flown on the 14-day Spacelab Life Sciences-2 (SLS-2) mission. Bone marrow cells were harvested from one group of rats killed inflight (FD13) and blood was drawn from(More)
Experiments were carried out on peripheral blood leukocytes and spleen lymphocytes from 29 male rats that were flown during the Spacelab Life Sciences 1 (SLS-1) nine-day mission on the shuttle Columbia in June 1991 and on appropriate ground controls. On the day of landing, there was a significant decrease in the total white blood cell counts (P < 0.0001) of(More)
Studies are described which were designed to compare an erythropoietin (Ep) bioassay using the uptake of 125I-deoxyuridine (125-I-UdR) into whole cells cultured in micro-titer plates with an established method where the cells were cultured in 1 ml volumes using the incorporation of 59Fe into heme as the endpoint. The results demonstrate the validity of the(More)
Event-related potentials (ERPs) have been used extensively to study the processes involved in recognition memory. In particular, the early familiarity component of recognition has been linked to the FN400 (mid-frontal negative deflection between 300 and 500 ms), whereas the recollection component has been linked to a later positive deflection over the(More)
OBJECTIVES Bloating, abdominal pain, and early satiety have been reported in up to 30% of patients after Nissen fundoplication. We hypothesized that these postsurgical complications in children and young adults are linked to either the effects of surgery on gastric sensation, compliance or motor function or to preexisting physiological abnormalities. (More)
Hematologic studies were performed on 21 ground control rats and 21 rats flown during the Spacelab Life Sciences-2 14-day mission. Group A (n = 5) was used to collect blood in flight and 9 days postflight, group B (n = 5) was injected with recombinant human erythropoietin (rhEpo), group C (n = 5) received saline as a control, and group D (n = 6) was killed(More)
Expertise facilitates change detection performance, but the neural underpinnings of these benefits are unknown. Expert image analysts showed larger change-related ERP effects between about 100-200 msec after stimulus onset than did novices, which correlated with both accuracy and years of analysis experience. These results demonstrate that years of visual(More)