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Wheat is not considered a tropical species but the variety Cuba C-204 was well grown in Cuba since more than 40 years ago. Thus its radiosensibility was studied to use radiomutagenesis with in a program to obtain new varieties. Survival, height of plant and root, green and dry mass, pollen formation and fertility, percentage of florest carrying seeds and M1 seed features were considered as indexes. Original seeds with 12-14% humidity was irradiated to 300-800 Gy seeded and cultivated together control at underset laboratory and fields conditions. The GR50 (growth reduction) was determinate at 695 Gy; its was higher than report for Triticum aestivum L in International Atomic Energy Agency. The 300 Gy doses induced reparable affectation during ontogenesis development; at 400 Gy injuries in some index is were reparaid even provoking stimulus. The 500 Gy doses induced unrecovered damage; 600 Gy induced total sterility and lethality was 100% at 800 Gy, so that sterility is then index limiting the doses increase. [ABSTRACT FROM AUTHOR]

The follow-up of HBV markers in selected high infection risk populations, in patients from the hemodialysis and peritoneal dialysis services was used to assess the effectiveness of a special vaccination program. Viral infection markers were studied in prevalence cross sections of the whole population of patients, and also by recording the reports of clinical cases of hepatitis B occurred during that period in those groups of patients. The prevention program consisted of the vaccination of all patients negative to the viral markers and the indication of vaccination for the new cases during the period of the kidney disease, just before the start of the treatment at the hemodialysis unit; besides all the persons susceptible to infection that had already been included in the program, regardless of the stage of the disease. The results show the benefit of the vaccination in these patients, but it is more effective in the period before the treatment with dialysis where there is a lower possibility of being exposed to the virus and the immune system is still competent. Once the program was established, after a follow up o 6 years, there have been no reports of new cases of hepatitis B and the incidence of the disease has been declining.