4 research outputs found

    Evaluaci贸n de la actividad antibacteriana de los extractos hex谩nicos de las inflorescencias de palmas comestibles de la sierra de Tabasco, M茅xico

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    Con el objetivo de buscar alternativas para la prevenci贸n y tratamiento de infecciones de origen alimentario, la actividad antibacteriana de los extractos crudos de dos palmas (Astrocaryum mexicanumLiebm. ex Mart. yChamaedorea cataractarumMart.) contra tres bacterias (Staphylococcus aureusATCC 25923,Salmonella typhimuriumATCC 14028 yBacillus cereusATCC 11778) fue evaluada. La parte comestible de las inflorescencias de cada especie se sec贸 a 40潞C por 48 horas, se moli贸 y almacen贸 para su posterior estudio. Los extractos crudos de etanol y hexano, se obtuvieron mediante maceraci贸n a temperatura ambiente durante 24 horas con los respectivos solventes. La actividad antimicrobiana se evalu贸 mediante la t茅cnica de difusi贸n en agar con discos impregnados con el extracto crudo de cada especie. La determinaci贸n de la concentraci贸n m铆nima inhibitoria (CMI) se realiz贸 mediante el m茅todo de diluci贸n en caldo y la concentraci贸n m铆nima bactericida (CMB) sembrando las diluciones sin turbidez para observar la presencia de colonias bacterianas. Se encontr贸 que los extractos hex谩nicos de la inflorescencia deC. cataractarumyA. mexicanumno presentaron actividad contraS. typhimurium. Ninguno de los extractos etan贸licos present贸 actividad antibacteriana a la concentraci贸n ensayada. La CMI del extracto hex谩nico de C. cataractarum fue de 3.85 mg ml-1paraB. cereus. Finalmente, se encontr贸 que los extractos etan贸licos de las especies estudiadas no presentaron una CMI ni CMB a la mayor concentraci贸n probada (60 mg ml-1)

    Evaluaci贸n de la actividad antibacteriana de los extractos hex谩nicos de las inflorescencias de palmas comestibles de la Sierra de Tabasco, M茅xico

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    In order to search for prevention and treatment alternatives of food infections, the evaluation of the antibacterial activity of extracts of the palms Astrocaryum mexicanum Liebm. ex Mart. and Chamaedorea. cataractarum Mart. against three bacteria strains (Staphylococcus aureus ATCC 25923, Salmonella typhimurium ATCC 14028 and Bacillus cereus ATCC 11778) was performed. The edible part of each palm inflorescences were dried at 40掳C for 48 h and grounded and stored for later study. Crude extracts obtained with ethanol or hexane, by 24 h maceration at room temperature were prepared. The antimicrobial activity was assessed using the agar diffusion method with crude extract impregnated discs. Determination of Minimum Inhibitory Concentration (MIC) was performed using the broth dilution method and the Minimum Bactericidal Concentration (MBC) by inoculating the dilutions without turbidity for bacterial colony presence searching. We found that the hexanic extract of C. cataractarum and A. mexicanum showed no activity against S. typhimurium. None of the ethanol extracts showed antibacterial activity with the tested concentrations. The MIC of C. cataractarum hexanic extract was 3.85 mg ml-1for both B. cereus. Finally, it was found that ethanolic extracts of the studied species did not presented a MIC or MBC at the highest concentration tested (60 mg ml-1).Con el objetivo de buscar alternativas para la prevenci贸n y tratamiento de infecciones de origen alimentario, la actividad antibacteriana de los extractos crudos de dos palmas (Astrocaryum mexicanum Liebm. ex Mart. y Chamaedorea cataractarum Mart.) contra tres bacterias (Staphylococcus aureus ATCC 25923, Salmonella typhimurium ATCC 14028 y Bacillus cereus ATCC 11778) fue evaluada. La parte comestible de las inflorescencias de cada especie se sec贸 a 40掳C por 48 horas, se moli贸 y almacen贸 para su posterior estudio. Los extractos crudos de etanol y hexano, se obtuvieron mediante maceraci贸n a temperatura ambiente durante 24 horas con los respectivos solventes. La actividad antimicrobiana se evalu贸 mediante la t茅cnica de difusi贸n en agar con discos impregnados con el extracto crudo de cada especie. La determinaci贸n de la concentraci贸n m铆nima inhibitoria (CMI) se realiz贸 mediante el m茅todo de diluci贸n en caldo y la concentraci贸n m铆nima bactericida (CMB) sembrando las diluciones sin turbidez para observar la presencia de colonias bacterianas. Se encontr贸 que los extractos hex谩nicos de la inflorescencia de C. cataractarum y A. mexicanum no presentaron actividad contra S. typhimurium. Ninguno de los extractos etan贸licos present贸 actividad antibacteriana a la concentraci贸n ensayada. La CMI del extracto hex谩nico de C. cataractarum fue de 3.85 mg ml-1 para B. cereus. Finalmente, se encontr贸 que los extractos etan贸licos de las especies estudiadas no presentaron una CMI ni CMB a la mayor concentraci贸n probada (60 mg ml-1)

    Evaluaci贸n de la actividad antibacteriana de los extractos hex谩nicos de las inflorescencias de palmas comestibles de la sierra de Tabasco, M茅xico

    No full text
    Con el objetivo de buscar alternativas para la prevenci贸n y tratamiento de infecciones de origen alimentario, la actividad antibacteriana de los extractos crudos de dos palmas (Astrocaryum mexicanumLiebm. ex Mart. yChamaedorea cataractarumMart.) contra tres bacterias (Staphylococcus aureusATCC 25923,Salmonella typhimuriumATCC 14028 yBacillus cereusATCC 11778) fue evaluada. La parte comestible de las inflorescencias de cada especie se sec贸 a 40潞C por 48 horas, se moli贸 y almacen贸 para su posterior estudio. Los extractos crudos de etanol y hexano, se obtuvieron mediante maceraci贸n a temperatura ambiente durante 24 horas con los respectivos solventes. La actividad antimicrobiana se evalu贸 mediante la t茅cnica de difusi贸n en agar con discos impregnados con el extracto crudo de cada especie. La determinaci贸n de la concentraci贸n m铆nima inhibitoria (CMI) se realiz贸 mediante el m茅todo de diluci贸n en caldo y la concentraci贸n m铆nima bactericida (CMB) sembrando las diluciones sin turbidez para observar la presencia de colonias bacterianas. Se encontr贸 que los extractos hex谩nicos de la inflorescencia deC. cataractarumyA. mexicanumno presentaron actividad contraS. typhimurium. Ninguno de los extractos etan贸licos present贸 actividad antibacteriana a la concentraci贸n ensayada. La CMI del extracto hex谩nico de C. cataractarum fue de 3.85 mg ml-1paraB. cereus. Finalmente, se encontr贸 que los extractos etan贸licos de las especies estudiadas no presentaron una CMI ni CMB a la mayor concentraci贸n probada (60 mg ml-1).</span

    Effect of the COVID-19 pandemic on surgery for indeterminate thyroid nodules (THYCOVID): a retrospective, international, multicentre, cross-sectional study

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    Background: Since its outbreak in early 2020, the COVID-19 pandemic has diverted resources from non-urgent and elective procedures, leading to diagnosis and treatment delays, with an increased number of neoplasms at advanced stages worldwide. The aims of this study were to quantify the reduction in surgical activity for indeterminate thyroid nodules during the COVID-19 pandemic; and to evaluate whether delays in surgery led to an increased occurrence of aggressive tumours. Methods: In this retrospective, international, cross-sectional study, centres were invited to participate in June 22, 2022; each centre joining the study was asked to provide data from medical records on all surgical thyroidectomies consecutively performed from Jan 1, 2019, to Dec 31, 2021. Patients with indeterminate thyroid nodules were divided into three groups according to when they underwent surgery: from Jan 1, 2019, to Feb 29, 2020 (global prepandemic phase), from March 1, 2020, to May 31, 2021 (pandemic escalation phase), and from June 1 to Dec 31, 2021 (pandemic decrease phase). The main outcomes were, for each phase, the number of surgeries for indeterminate thyroid nodules, and in patients with a postoperative diagnosis of thyroid cancers, the occurrence of tumours larger than 10 mm, extrathyroidal extension, lymph node metastases, vascular invasion, distant metastases, and tumours at high risk of structural disease recurrence. Univariate analysis was used to compare the probability of aggressive thyroid features between the first and third study phases. The study was registered on ClinicalTrials.gov, NCT05178186. Findings: Data from 157 centres (n=49 countries) on 87 467 patients who underwent surgery for benign and malignant thyroid disease were collected, of whom 22 974 patients (18 052 [78路6%] female patients and 4922 [21路4%] male patients) received surgery for indeterminate thyroid nodules. We observed a significant reduction in surgery for indeterminate thyroid nodules during the pandemic escalation phase (median monthly surgeries per centre, 1路4 [IQR 0路6-3路4]) compared with the prepandemic phase (2路0 [0路9-3路7]; p&lt;0路0001) and pandemic decrease phase (2路3 [1路0-5路0]; p&lt;0路0001). Compared with the prepandemic phase, in the pandemic decrease phase we observed an increased occurrence of thyroid tumours larger than 10 mm (2554 [69路0%] of 3704 vs 1515 [71路5%] of 2119; OR 1路1 [95% CI 1路0-1路3]; p=0路042), lymph node metastases (343 [9路3%] vs 264 [12路5%]; OR 1路4 [1路2-1路7]; p=0路0001), and tumours at high risk of structural disease recurrence (203 [5路7%] of 3584 vs 155 [7路7%] of 2006; OR 1路4 [1路1-1路7]; p=0路0039). Interpretation: Our study suggests that the reduction in surgical activity for indeterminate thyroid nodules during the COVID-19 pandemic period could have led to an increased occurrence of aggressive thyroid tumours. However, other compelling hypotheses, including increased selection of patients with aggressive malignancies during this period, should be considered. We suggest that surgery for indeterminate thyroid nodules should no longer be postponed even in future instances of pandemic escalation. Funding: None
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