RESUMO
A native cyanobacterial strain, Desertifilum tharense UAM-C/S02, was studied as a possible C-phycocyanin (C-PC) producer. Photosynthetic activity (PA) assays through oxygen production determined the proper temperature and range of irradiances to be tested in a stirred tank photobioreactor. The highest C-PC productivity (97 mg L-1 d-1), with a yield of 86.46 mgC-PC gB-1 was obtained at 730 µmol photons m-2 s-1 with a biomass productivity of 608 mg L-1 d-1 and the CO2 fixation rate was 1,194 mg L-1 d-1. The 1.81 crude extract purity value is the highest reported for this genus, which was improved to biomarker-grade purity after a two-step purification strategy comprising precipitation with ammonium sulfate, followed by dialysis. The purified C-PC was almost entirely radical-free using 1 mg mL-1, which validates its potential use in therapeutic formulations.
Assuntos
Antioxidantes , Ficocianina , Diálise Renal , Água DoceRESUMO
The photoautotrophic poly(3-hydroxybutyrate) (PHB) production by cyanobacteria is an attractive option as it only requires CO2 and light. In this work, a new wild-type strain producing PHB, Synechococcus elongatus UAM-C/S03, was identified using a polyphasic approach. The strain was cultured in a photobioreactor operated under N-sufficiency conditions at different pH values (7 to 11) and fed with CO2 on demand. We also evaluated the production of PHB under N-starving conditions. Highest biomass productivity, 324 mg L-1 d-1, and CO2 capture, 674 mg L-1 d-1, were obtained at pH 7 and under N-sufficiency conditions. The strain accumulated 29.42% of PHB in dry cell weight (DCW) under N-starvation conditions without pH control, and highest PHB productivity was 58.10 mg L-1 d-1. The highest carbohydrate content registered at pH 8, 50.84% in DCW, along with a release of carbon-based organic compounds, suggested the presence of exopolysaccharides in the culture medium.
Assuntos
Hidroxibutiratos , Synechococcus , Ácido 3-Hidroxibutírico , Ambientes Extremos , PoliésteresRESUMO
En el mundo médico, las decisiones del personal de Unidad de Cuidado Intensivo (UCI), Influyen tanto de manera positiva como negativa en el entorno de un paciente y su familia. El personal de salud que está vinculado al cuidado del paciente en UCI, debe ser capaz de resolver y tomar decisiones que son trascendentales para el futuro de una persona que se encuentra entre la vida y la muerte. A pesar de esta obligación moral y profesional, no existe un consenso ampliamente conocido para la toma de decisiones, que facilite al personal afrontar la situación de un paciente en estado crítico. Razón por la cual la educación universitaria en bioética es de vital Importancia, para la formación de profesionales competentes, libre pensadores con responsabilidad social, que actúen como defensores y promotores de la vida.
In the medical world, decisions of staff of Intensive Care Unit, both in a positive and negative way, may affect the patient's environment and family. The health team in charge of the patient care in critical condition should be, able to make decisions important for the future of someone who is between life and death. Despite this moral and professional duty, there is no consensus widely known for decision-making, to provide the staff means to deal this situation, a patient in critical condition. For that reason bioethics education performs vital importance for the training of competent professionals, thinkers open to social responsibility, acting as defenders and promoters of life.
Assuntos
Humanos , Bioética , Tomada de Decisões , Educação , Unidades de Terapia IntensivaRESUMO
El propósito de esta investigación fue observar si la presencia de OP-1 sobre las superficies radiculares dependía del tratamiento que ésta recibiera. Se obtuvo una muestra de dientes de pacientes con exodoncia indicada por periodontitis del adulto avanzada localizada, los dientes de la muestra fueron distribuidos en 3 grupos de diez muestras cada uno.
