Juan F. Silva

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To explore the possibility that environmental and/or genetic factors may yield clues to the etiology of osteogenic sarcoma, an epidemiologic retrospective study of all cases of osteogenic sarcoma in a country with clear geographic and racial variables (Malaysia) was conducted covering a 4-year period. Sixty-eight cases were identified (+85% of the predicted(More)
The demography of shoots of eight populations of a herbaceous perennial exhibiting clonal growth, is presented. The study was done along an elevational gradient, from a more open secondary mixed forest to a denser, more mature stand. Most shoots lived one to three years on the average, but shoots as old as twelve years were found. Large variation in(More)
The efficacy and safety of two whole IgG polyvalent antivenoms (A and B) were compared in a randomised, blinded clinical trial in 67 patients systemically envenomed by Bothrops asper in Colombia. Both antivenoms were fractionated by caprylic acid precipitation and had similar neutralising potencies, protein concentrations and aggregate contents. Antivenom B(More)
®) y del Instituto Butantan, Brasil (Soro antiaracnídico ®) con los venenos de T. asthenes y Centruroides gracilis/ Centruroides margaritatus de Colombia. Conclusiones. Las picaduras por T. asthenes, con elevado subregistro, están asociadas a viviendas cercanas a bosques húmedos tropicales. Su veneno y el de C. gracilis, con diferencias de especificidad,(More)
Age-specific prevalence rates of parasitemia and seroreactivity to Trypanosoma cruzi were determined in a rural area endemic for Chagas' disease in Northeast Brazil. Parasitemia was detected by blood cultures and xenodiagnosis, and serum antibodies to the parasite were measured by the complement fixation (CF) and indirect immunofluorescence (IFA) tests. Of(More)
In a field experiment we studied the relationships between architecture, seasonal aerial biomass growth and interference from neighbours in three savanna grass species differing in time of flowering: a precocious species (Elyonurus adustus), an early species (Leptocoryphium lanatum) and a late species (Andropogon semiberbis). To detect the neighbour(More)
INTRODUCTION Scorpion stings are a public health problem in many countries. However, in Colombia, very few epidemiological, clinical or toxicological studies have been undertaken. OBJECTIVE Ecological and epidemiological aspects were related to the prevalence of scorpion stings by Tityus asthenes. The clinical features of envenomization were described in(More)
  • J F Silva
  • 1976
This is a report of a total elbow low friction arthroplasty consisting of a vitallium humeral component and a high density polyethylene ulnar component equipped with a special snap-lock fit joint. The immediate results in 16 patients are most encouraging.
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