Physiological response of Lactuca sativa exposed to 2-nonanone emitted by Bacillus sp. BCT9.

Volatile organic compounds (VOCs) released from bacterial species have been reported as plant growth inducers. In this sense, Lactuca sativa was used as model vegetable to prospect the effects of 2-nonanone released by Bacillus sp. BCT9 at cellular and organ structure level, so we present preliminary results about the physiological effects. In this study, 2-day-old L. sativa were exposed to 2-nonanone for 10 days under two delivery systems: 1) 2-nonanone (abrupt delivery) and 2) 2-nonanone + lanolin (controlled delivery). The X-ray elemental microanalysis, scanning electron and confocal laser microscopies techniques were used to evaluate physiological changes "in vivo" conditions. The results indicated that 2-nonanone increased root and shoot length independently of 2-nonanone delivery system after 7 days of exposition. Additionally, 2-nonanone elicited the increase of anthocyanin and not affects chlorophyll content and electrolyte leakage percentage. The abrupt delivery elicited the increase of both length and density of root hair without causing changes in size of cell epidermis, while controlled delivery induced stomatal opening. Besides, 2-nonanone exposition did not modify the composition and distribution of carbon, nitrogen, phosphorus, potassium, and chlorine in the surface of plant tissue. The results suggested that 2-nonanone acts as a bacterial signal molecule to elicit changes related to root development without damaging the external morphology while epidermal cells at leaf level are not affected, suggesting that 2-nonanone can be an important tool to apply to vegetables.

Primer reporte de necrólisis epidérmica tóxica por antibiótico oral en Gambia / First report of toxic epidermal necrolysis due to oral antibiotic in Gambia

Las reacciones adversas medicamentosas más frecuentes son las cutáneas, ocurriendo en un 2% de los tratamientos. La mayoría de las veces se alcanza el diagnóstico por exclusión. La más temida es la necrólisis epidérmica tóxica, de la que se presentan anualmente hasta 4 casos por millón de habitantes, con una mortalidad que alcanza en ocasiones hasta el 70 %. El objetivo fue presentar un paciente con necrólisis epidérmica tóxica por lo infrecuente de esta enfermedad, su alta mortalidad y su evolución clínica característica. Paciente gambiano, de 29 años de edad, con antecedentes de salud, que después de comenzar tratamiento ambulatorio con antibiótico oral para una piodermitis facial, presentó lesiones ampollares que se extendieron por todo el cuerpo. El paciente llevó tratamiento de sostén, esteroideo oral, antibiótico de amplio espectro oral, parenteral y tópico; después de una evolución desfavorable de 30 días, fallece. Resultó llamativa la ausencia de lesiones mucosas a pesar de la extensión total de las lesiones cutáneas. Fue difícil el manejo de este paciente en un hospital de periferia sin el arsenal terapéutico adecuado, ni la unidad idónea para su cuidado (AU).

The most frequent drug adverse reactions are the skin ones, occurring in 2 % of the treatments; most of the times the diagnosis is reached by exclusion. The most feared one is the toxic epidermal necrolysis, presenting yearly up to 4 cases per million of inhabitants with a mortality occasionally reaching 70 %. The objective was presenting the case of a patient with toxic epidermal necrolysis because of the rarity of this disease, its high mortality and characteristic clinical evolution. The patient was a Gambian aged 29 years, with health antecedents, who after beginning an outpatient treatment with oral antibiotic for a facial pyodermitis, presented bullous lesions extended throughout all the body. The patient received support treatment, oral steroidal treatment and oral, parenteral and topic treatment with a wide spectrum antibiotic; after a 30-days unfavorable evolution, he died. It was thought-provoking the absence of mucous lesions in spite of the total extension of the skin lesions. It was difficult the management of this patient in a peripheral hospital without the adequate therapeutic arsenal nor the suitable unit for his care (AU).

Primer reporte de necrólisis epidérmica tóxica por antibiótico oral en Gambia / First report of toxic epidermal necrolysis due to oral antibiotic in Gambia

Las reacciones adversas medicamentosas más frecuentes son las cutáneas, ocurriendo en un 2% de los tratamientos. La mayoría de las veces se alcanza el diagnóstico por exclusión. La más temida es la necrólisis epidérmica tóxica, de la que se presentan anualmente hasta 4 casos por millón de habitantes, con una mortalidad que alcanza en ocasiones hasta el 70 %. El objetivo fue presentar un paciente con necrólisis epidérmica tóxica por lo infrecuente de esta enfermedad, su alta mortalidad y su evolución clínica característica. Paciente gambiano, de 29 años de edad, con antecedentes de salud, que después de comenzar tratamiento ambulatorio con antibiótico oral para una piodermitis facial, presentó lesiones ampollares que se extendieron por todo el cuerpo. El paciente llevó tratamiento de sostén, esteroideo oral, antibiótico de amplio espectro oral, parenteral y tópico; después de una evolución desfavorable de 30 días, fallece. Resultó llamativa la ausencia de lesiones mucosas a pesar de la extensión total de las lesiones cutáneas. Fue difícil el manejo de este paciente en un hospital de periferia sin el arsenal terapéutico adecuado, ni la unidad idónea para su cuidado (AU).

The most frequent drug adverse reactions are the skin ones, occurring in 2 % of the treatments; most of the times the diagnosis is reached by exclusion. The most feared one is the toxic epidermal necrolysis, presenting yearly up to 4 cases per million of inhabitants with a mortality occasionally reaching 70 %. The objective was presenting the case of a patient with toxic epidermal necrolysis because of the rarity of this disease, its high mortality and characteristic clinical evolution. The patient was a Gambian aged 29 years, with health antecedents, who after beginning an outpatient treatment with oral antibiotic for a facial pyodermitis, presented bullous lesions extended throughout all the body. The patient received support treatment, oral steroidal treatment and oral, parenteral and topic treatment with a wide spectrum antibiotic; after a 30-days unfavorable evolution, he died. It was thought-provoking the absence of mucous lesions in spite of the total extension of the skin lesions. It was difficult the management of this patient in a peripheral hospital without the adequate therapeutic arsenal nor the suitable unit for his care (AU).