196,232 research outputs found
Validità ed affidabilità del protocollo di Triage sintomatologico standardizzato del Friuli Venezia Giulia
No full textEffects of prolonged high-altitude exposure on peripheral adrenergic receptors in young healthy volunteers.
No full textThe regulation of adrenergic receptors during hypoxia is complex, and the results of published reports have not been consistent. In the present study blood cell adrenoceptor characteristics at sea level (SL) before and after prolonged exposure to high altitude (HA) were measured in seven trained young male lowlanders. Sympathoadrenal activity and clinical haemodynamic parameters were also evaluated before departure (SLB), after 1 week (HA1) and 4 weeks (HA4) at HA and 1 week after return to sea level (SLA). As compared to pre-departure sea level values, urinary norepinephrine excretion increased significantly during altitude exposure [SLB: 10.26 (3.04) microg x 3 h(-1); HA1: 23.2 (4.19) microg x 3 h(-1); HA4: 20.3 (8.68) microg x 3 h(-1)] and fell to pre-ascent values 1 week after return to sea level [SLA: 9 (2.91) microg x 3 h(-1)]. In contrast, mean urinary epinephrine levels did not increase over time at HA. Both systolic and diastolic blood pressures, as well as heart rate, were increased during HA exposure. The circadian blood pressure and heart rate rhythms were preserved during all phases of altitude exposure. Mean maximal binding (Bmax) of the alpha2-adrenoceptor antagonist [3H]rauwolscine to platelet membranes was significantly reduced (P < 0.001) after exposure to chronic hypoxia [SLB: 172.6 (48.5) fmol x mg(-1) protein versus SLA: 136.8 (56.1) fmol x mg(-1) protein] without change in the dissociation constant (K(D)). Neither the lymphomonocyte beta2-adrenoceptor Bmax [SLB: 38.5 (13.6) fmol x mg(-1) protein, versus SLA: 32.4 (12.1) fmol mg(-1) protein] nor the K(D) for [3H]dihydroalprenolol was affected by chronic hypoxia. Cyclic AMP (adenosine 3',5'-cyclic monophoshate) generation in lymphomonocytes by maximal isoproterenol stimulation was not modified after prolonged HA exposure. In conclusion, the down-regulation of alpha2-adrenoceptors appears to be an important component of the adrenergic system response to HA exposure
An early albumin permeability defect is prevented by strict glycemic control in incipient diabetic nephropathy
No full textIncipient diabetic nephropathy may be accompanied by an early albumin permeability defect together with hemodynamic alterations
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Efecte d'ionòfors de calci i d'AMPc sobre el transport de galactosa
No full textTesi de Llicenciatura per a la obtenció del Grau de Farmàcia. Facultat de Farmàcia. Universitat de Barcelona. Director: Joana M. Planas i Rosselló. 1981.Els nutrients no electrolítics travessen l'epiteli intestinal fonamentalment per dos mecanismes: la difusió simple i el transport actiu.
En les fases iniciáls del desenvolupament, tant en mamífers com en aus, la zona mitjana de l'intestí prim presenta dues característiques importants. En primer lloc, la seva capacitat per a transportar activament sucres i aminoácids es troba molt augmentada, comparada amb la que es presenta en l'animal adult. En segon lloc, el transport actiu és dependent de la concentració del calci extern, dependencia que tampoc s'observa en els adults
Aortic wall shear stress changes after percutaneous aortic angioplasty in a rabbit animal model
No full textDr. Duane M. Jackson, Morehouse College, July 2011
No full textThis video is a conversation with Dr. Duane M. Jackson. Dr. Jackson talks about his paper, "Recall and the Serial Position Effect: The Role of Primacy and Recency on Accounting Students' Performance." Jackie Daniel, AUC Woodruff Library, is the interviewer
Control of glomerular hyperfiltration and hypertrophy prevents the progression of renal damage in diabetic hypertensive rats
No full textRelationship between mechanical properties of the carotid artery wall and baroreceptor function in acutely treated hypertensive patients
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