Biomedical subjects

M Hulman

Publications and source records attributed to M Hulman.

4 recordsLinked to original sources

PubMed2004

Fullerene quantum gyroscope.

We report the observation of quantized rotational states of a diatomic C2 unit in solid endohedral fullerene C(2)Sc(2)@C(84). The rotational transitions induce a periodic line pattern in the low energy Raman spectrum. The rotational constant B and the C-C distance were found to be 1.73 cm(-1) and 0.127 nm, respectively. Density functional calculations revealed an intrinsic rotational barrier of the order of only a few meV for the C2 unit. The Schrödinger equation involving the potential barrier was solved and the Raman tensor matrix elements were calculated, yielding good quantitative agreement with the experiment. To our best knowledge this is the first intrinsic rotational spectrum of a diatomic plane molecular rotor.

Journal Article↗

PubMed2000

Periodic resonance excitation and intertube interaction from quasicontinuous distributed helicities in single-wall carbon nanotubes

Photoselective resonance Raman scattering from laser ablation grown single-wall carbon nanotubes is demonstrated to be consistent with a response from tubes with all geometrically allowed helicities. This information is drawn from an analysis of the resonance scattering by combining ab initio calculations for the mode frequencies with evaluations of the resonance cross sections for isolated tubes. The resonance excitation was found to exhibit an oscillatory behavior. To match the experiments and the calculations, the frequencies obtained from the latter must be up-shifted by 8.5% on the average. This stiffening is ascribed to the tube-tube interaction in the carbon nanotube bundles.

Journal Article↗

PubMed1994

Triple valve surgery with triple aorto-coronary bypass and endarterectomy of the right coronary artery.

This paper presents the case report of a 50-year-old woman with a triple valve lesion of rheumatic origin and ischemic coronary disease. The patient underwent successful simultaneous triple valve surgery; the aortic and mitral valves were replaced by mechanical prostheses, and the tricuspid valve was repaired by annuloplasty, together with three aorto-coronary bypasses and endarterectomy of the right coronary artery. The peri- and postoperative courses were uneventful and the patient was discharged from hospital in good clinical condition 12 days after surgery.

Aortic Valve↗

PubMed1992

[Endarterectomy of the coronary arteries].

The authors analyze 50 patients with endarterectomy of the coronary arteries during the periods of 1972-1974 and 1988-1990. The results of endarterectomy of the right and left coronary artery provide evidence of its justification in indicated cases whereby contrary to some departments the results of endarterectomy of the left coronary artery are comparable with endarterectomy of the right coronary artery.

Coronary Disease↗