Marc P. Lynn

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Fast transport of intra-axonal organelles was studied in motor nerve from amyotrophic lateral sclerosis (ALS) patients. Organelle traffic in ALS nerves demonstrated a significant increase in anterograde mean speed, while retrograde mean speed was decreased compared with that of controls. Retrograde traffic density (organelles per unit time) was also(More)
We explored the influence of several compositional factors considered capable of influencing the nucleation time of model biles supersaturated in cholesterol. In addition to the classical techniques, e.g., electron microscopy and quasielastic light scattering, employed for size measurement and structural assessment, we employed a novel technique, i.e.,(More)
Rapid nucleation of cholesterol crystals has previously been shown to provide a sharp discrimination between abnormal (cholesterol gallstone-associated) and normal human gallbladder bile. In the present study, we sought to further clarify the crystal nucleation process by time-lapse microscopy using a novel high-resolution video-enhanced microscopy(More)
The presence of small vesicles composed of phospholipid and cholesterol has recently been demonstrated in super-saturated model and in dilute native human biles by several groups using differing methods. Among compositional factors shown to favor spontaneous vesicle formation and prolong the cholesterol monohydrate nucleation time in model bile systems are(More)
The measurement of cardiac output has many clinical applications and the development of a reliable, non-invasive measurement technique would be of considerable value to clinicians, cardio-respiratory physiologists and cardiovascular pharmacologists. Currently-used methods of measuring cardiac output are either invasive, and therefore potentially dangerous,(More)
The purpose of this study was to assess the effect of rapid baroreceptor resetting on the baroreflex control of renal sympathetic nerve activity in conscious rabbits. Renal sympathetic nerve activity was recorded and used as an index of the efferent limb of the baroreflex. Heart rate and arterial pressure were also recorded. Arterial pressure was raised(More)
Moving intra-axonal organelles demonstrate frequent variations in speed when viewed over several seconds. To evaluate these and other motion variations, a long-term analysis of organelle motion in isolated axoplasm of Myxicola infundibulum was carried out using differential interference contrast optics and analog and digital image enhancement techniques.(More)
The effect of increased arterial pressure on aortic depressor nerve activity was studied in the conscious rabbit. Aortic baroreceptor resetting was observed following 15 min of sustained pressure elevation. At 15 min, there was a significant increase in the threshold arterial pressure for aortic nerve activity, but peak nerve activity did not change. This(More)
1. Chronic sodium depletion in dogs is associated with a blunting of the pressor response to carotid occlusion. AFter section of the vagus nerves this pressor response reverts to normal although atropine is without effect, suggesting a possible role for increased activity of cardiopulmonary vagal afferents in suppressing sympathetic outflow. Since increases(More)