Rubella virions demonstrated by negative-contrast electron microscopy have recently been reported to range from 500 to 750 A in diameter and to have amorphous pleomorphic envelopes (J. M. Best et al., Lancet 2:237, 1967). Consonant with these observations, sedimentation studies have indicated a diameter of 850 A and ultrafiltration experiments, 900 A (B. Russell et al., J. Gen. Virol. 1:305, 19...

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2. Eisenberg DM, Davis RB, Ettner SL, et al. Trends in alternative medicine use in the United States, 1990-1997: results of a follow-up national survey. JAMA. 1998;280:1569–75. 3. Información técnica de Coumadin® (warfarina sódica); texto actualizado enero 2010. Bristol-Myers Squibb Pharma Company. Princeton, NJ, EE.UU. 4. Información de haba tonka en drugs.com. Disponible en: http:// www.drugs...