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Cardiac output by Doppler echocardiography in the premature baboon: Comparison with radiolabeled microspheres (1991)

Kinsella, John P. ; Morrow, W. Robert ; Gerstmann, Dale R. ; [et al.]

Springer

Pediatric cardiology 12 (1991), S. 92-97

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ISSN: 1432-1971

Keywords: Doppler echocardiography ; Microspheres ; Cardiac output ; Premature baboon

Source: Springer Online Journal Archives 1860-2000

Topics: Medicine

Notes: Summary Pulsed-Doppler echocardiography (PDE) is a useful noninvasive method for determining left ventricular output (LVO). However, despite increasingly widespread use in neonatal intensive care units, validation studies in prematures with cardiopulmonary disease are lacking. The purpose of this study was to compare radiolabeled microsphere (RLM) and PDE measurements of LVO, using the critically ill premature baboon as a model of the human neonate. Twenty-two paired RLM and PDE measurements of LVO were obtained in 14 animals between 3 and 24 h of age. Average PDELVO was 152 ml/min/kg (range, 40–258 ml/min/kg) compared to 158 ml/min/kg (range, 67–278 ml/min/kg) measured by RLM. Linear regression analysis of the paired measurements showed good correlation with a slope near unity (y=0.94x+4.20,r=0.91, SEE=25.7 ml). We conclude that PDE determinations of LVO compare well with those measured by RLM in the premature baboon. PDE appears to provide a valid estimate of LVO and should be useful in human prematures with cardiopulmonary distress.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF02238410

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In-Situ mechanistic studies of the reaction of trimethylgallium and phosphine in zeolite H-Y (1993)

Anderson, M. W. ; Logothetis, G. K. ; Pemble, M. E. ; [et al.]

New York, NY [u.a.] : Wiley-Blackwell

Advanced Materials for Optics and Electronics 2 (1993), S. 313-318

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ISSN: 1057-9257

Keywords: MOCVD ; MAS-NMR ; CARS ; Quantum effects ; Chemistry ; Polymer and Materials Science

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Electrical Engineering, Measurement and Control Technology , Physics

Notes: Coherent anti-Stokes Raman scattering (CARS) has been utilised to monitor the decomposition of trimethylgallium (TMGa) on the reactive internal surface of the protonated form of zeolite Y under metal organic chemical vapour deposition (MOCVD) conditions designed to produce GaP deposits that exhibit quantum-size effects. The CARS data clearly reveal the facile room temperature decomposition of TMGa in the zeolite, as evidenced by the detection of increasing levels of methane with increasing reaction time. In addition, the zeolite samples were analysed by solid state nuclear magnetic resonance with magic angle spinning (MAS NMR) before reaction, after reaction of TMGa and after subsequent reaction with phosphine at 300°C. These data reveal that TMGa reacts with acid sites in the zeolite 12-rings, resulting in species containing methyl groups. Subsequent exposure to phosphine removes these methyl group protons, leaving various, as yet not fully characterised, phosphorus species. Exposure to phosphine does not appear to regenerate the acid sites on the zeolite.

Additional Material: 3 Ill.