Estudio cinético e isotérmico de la biosorción de Zinc (II) y Cadmio (II) para un sistema monometálico-bimetálico por Undaria pinnatífida sp

Se estudió la capacidad de adsorción que tiene el alga marina Undaria pinnatifida sp. en la adsorción de los iones metálicos de zinc y cadmio para un sistema individual (monometalico) y en mezclas (bimetálico) de una solución acuosa. Se estudió preliminarmente para este proceso, el tiempo de contacto, pH de la solución y tratamiento del biopolímero. El estudio de la cinética determinó que el comportamiento del sistema de adsorción fue de pseudo segundo orden usando la ecuación de Langergren (concentración inicial 50 mg/L, peso del biopolímero = 0,4g; pH = 3 - 5). El modelamiento no lineal de las isotermas de Langmuir y Freundlich, con el modelo de Langmuir se obtuvo un mejor coeficiente de correlación cercano a la unidad, determinándose que la máxima capacidad de sorción de los iones metales como zinc fue qmax = 44,91 mg/g y cadmio qmax = 102,38 mg/g a pH = 4 en un tiempo de contacto de 60 minutos, con el alga sin tratamiento en el sistema monometálico, siendo más eficiente la adsorción para el ion cadmio. Para el sistema bimetálico se empleó dos métodos: el método de las isoconcentraciones que dio a conocer el comportamiento en la adsorción de ambos metales en solución y el método de las concentraciones variables empleando el análisis de regresión del modelo de Langmuir modificado, que dio a conocer los valores de la capacidad máxima de adsorción, siendo para el ion metálico zinc qmax = 0,27 mmol/g; cadmio qmax= 1,27 mmol/g y para la adsorción de ambos metales sobre la biomasa qmax= 1,13 mmol/gFil: Mori C., M.. Universidad Peruana Cayetano Heredia; PerúFil: Maldonado G., H.. Universidad Nacional Mayor de San Marcos; PerúFil: Guzman L., E. Universidad Nacional Mayor de San Marcos; PerúFil: Eyras, María Cecilia. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Nacional Patagónico; ArgentinaFil: Bernardelli, Cecilia Elena. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico la Plata. Centro de Investigación y Desarrollo En Fermentaciones Industriales (i); Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Nacional Patagónico; ArgentinaFil: Viera, M.. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico la Plata. Centro de Investigación y Desarrollo En Fermentaciones Industriales (i); Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Nacional Patagónico; ArgentinaFil: Donati, Edgardo Ruben. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico la Plata. Centro de Investigación y Desarrollo En Fermentaciones Industriales (i); Argentin

Geographical discrimination of honeys through antioxidant capacity, mineral content and colour

The assessment of geographical origin of honey is economically important for producers and consumers as every region may present particular quality characteristics. In this study, honeys from the seven different regions of Buenos Aires province (Argentina) were characterised by their antioxidant capacity (DPPH, FRAP), total phenolic content (TPC), mineral composition, colour and ash. Honeys showed significant differences among their antioxidant capacity (DPPH), ash, colour and mineral content (P ≤ 0.05). Besides, a good antioxidant activity and low amounts of Cu and Zn (<1.0–1.5 and 0.7–1.8 mg kg 1, respectively) were found in the samples. Significant Pearson’s correlations (P ≤ 0.05) among the different parameters were found. Moreover, the linear discriminant analysis allowed the classification of honeys in their original groups with a prediction success of 98%. The present results suggest that honeys could be correctly classified by their geographical origin through their TPC, colour, ash and mineral concentrations.Centro de Investigación y Desarrollo en Criotecnología de AlimentosCentro de Investigación y Desarrollo en Fermentaciones Industriale

Kinetic and isothermal study of biosorption of zinc (II) and cadmium (II) for a system monometallic-bimetallic by undaria pinnatifida sp.

Se estudió la capacidad de adsorción que tiene el alga marina Undaria pinnatifida sp. en la adsorción de los iones metálicos de zinc y cadmio para un sistema individual (monometalico) y en mezclas (bimetálico) de una solución acuosa. Se estudió preliminarmente para este proceso, el tiempo de contacto, pH de la solución y tratamiento del biopolímero. El estudio de la cinética determinó que el comportamiento del sistema de adsorción fue de pseudo segundo orden usando la ecuación de Langergren (concentración inicial 50 mg/L, peso del biopolímero = 0,4g; pH = 3 - 5). El modelamiento no lineal de las isotermas de Langmuir y Freundlich, con el modelo de Langmuir se obtuvo un mejor coeficiente de correlación cercano a la unidad, determinándose que la máxima capacidad de sorción de los iones metales como zinc fue qmax = 44,91 mg/g y cadmio qmax = 102,38 mg/g a pH = 4 en un tiempo de contacto de 60 minutos, con el alga sin tratamiento en el sistema monometálico, siendo más eficiente la adsorción para el ion cadmio. Para el sistema bimetálico se empleó dos métodos: el método de las isoconcentraciones que dio a conocer el comportamiento en la adsorción de ambos metales en solución y el método de las concentraciones variables empleando el análisis de regresión del modelo de Langmuir modificado, que dio a conocer los valores de la capacidad máxima de adsorción, siendo para el ion metálico zinc qmax = 0,27 mmol/g; cadmio qmax= 1,27 mmol/g y para la adsorción de ambos metales sobre la biomasa qmax= 1,13 mmol/gAdsorption capacity was studied having seaweed Undaria pinnatifida sp. in adsorption of metal ions of zinc and cadmium to an individual system (monometallic) and mixtures (bimetal) of an aqueous solution. We studied this process preliminarily, contact time, pH of the biopolymer solution and treatment. The kinetic study of the behavior determined that the adsorption system was pseudo second-order equation using the Langergren (initial concentration 50mg/L, weight = 0,4g biopolymer, pH = 3 - 5). The nonlinear modeling the Langmuir and Freundlich isotherm, the Langmuir model obtained a better correlation coefficient close to unity, determining the maximum sorption capacity of metals such as zinc ions was qmax = 44,91mg/g and cadmium qmax = 102,38 mg/g at pH = 4 at a contact time of 60 minutes, with the alga in untreated monometallic system, being more efficient for the ion adsorption cadmium. For bimetallic systems used two methods, the method disclosed isoconcentrations that the adsorption behavior of both metals in solution and method of varying concentrations employing the regression analysis model modified Langmuir unveiled values of the maximum adsorption capacity, while for the zinc metal ion qmax = 0,27 mmol/g, cadmium qmax = 1,27 mmol/g for the adsorption of both metals on biomass qmax = 1,13 mmol/gCentro de Investigación y Desarrollo en Fermentaciones Industriale

Kinetic and isothermal study of biosorption of zinc (II) and cadmium (II) for a system monometallic-bimetallic by undaria pinnatifida sp.

Se estudió la capacidad de adsorción que tiene el alga marina Undaria pinnatifida sp. en la adsorción de los iones metálicos de zinc y cadmio para un sistema individual (monometalico) y en mezclas (bimetálico) de una solución acuosa. Se estudió preliminarmente para este proceso, el tiempo de contacto, pH de la solución y tratamiento del biopolímero. El estudio de la cinética determinó que el comportamiento del sistema de adsorción fue de pseudo segundo orden usando la ecuación de Langergren (concentración inicial 50 mg/L, peso del biopolímero = 0,4g; pH = 3 - 5). El modelamiento no lineal de las isotermas de Langmuir y Freundlich, con el modelo de Langmuir se obtuvo un mejor coeficiente de correlación cercano a la unidad, determinándose que la máxima capacidad de sorción de los iones metales como zinc fue qmax = 44,91 mg/g y cadmio qmax = 102,38 mg/g a pH = 4 en un tiempo de contacto de 60 minutos, con el alga sin tratamiento en el sistema monometálico, siendo más eficiente la adsorción para el ion cadmio. Para el sistema bimetálico se empleó dos métodos: el método de las isoconcentraciones que dio a conocer el comportamiento en la adsorción de ambos metales en solución y el método de las concentraciones variables empleando el análisis de regresión del modelo de Langmuir modificado, que dio a conocer los valores de la capacidad máxima de adsorción, siendo para el ion metálico zinc qmax = 0,27 mmol/g; cadmio qmax= 1,27 mmol/g y para la adsorción de ambos metales sobre la biomasa qmax= 1,13 mmol/gAdsorption capacity was studied having seaweed Undaria pinnatifida sp. in adsorption of metal ions of zinc and cadmium to an individual system (monometallic) and mixtures (bimetal) of an aqueous solution. We studied this process preliminarily, contact time, pH of the biopolymer solution and treatment. The kinetic study of the behavior determined that the adsorption system was pseudo second-order equation using the Langergren (initial concentration 50mg/L, weight = 0,4g biopolymer, pH = 3 - 5). The nonlinear modeling the Langmuir and Freundlich isotherm, the Langmuir model obtained a better correlation coefficient close to unity, determining the maximum sorption capacity of metals such as zinc ions was qmax = 44,91mg/g and cadmium qmax = 102,38 mg/g at pH = 4 at a contact time of 60 minutes, with the alga in untreated monometallic system, being more efficient for the ion adsorption cadmium. For bimetallic systems used two methods, the method disclosed isoconcentrations that the adsorption behavior of both metals in solution and method of varying concentrations employing the regression analysis model modified Langmuir unveiled values of the maximum adsorption capacity, while for the zinc metal ion qmax = 0,27 mmol/g, cadmium qmax = 1,27 mmol/g for the adsorption of both metals on biomass qmax = 1,13 mmol/gCentro de Investigación y Desarrollo en Fermentaciones Industriale

COVID Feel Good-An Easy Self-Help Virtual Reality Protocol to Overcome the Psychological Burden of Coronavirus

Background: Living in the time of the COVID-19 means experiencing not only a global health emergency but also extreme psychological stress with potential emotional side effects such as sadness, grief, irritability, and mood swings. Crucially, lockdown and confinement measures isolate people who become the first and the only ones in charge of their own mental health: people are left alone facing a novel and potentially lethal situation, and, at the same time, they need to develop adaptive strategies to face it, at home. In this view, easy-to-use, inexpensive, and scientifically validated self-help solutions aiming to reduce the psychological burden of coronavirus are extremely necessary. Aims: This pragmatic trial aims to provide the evidence that a weekly self-help virtual reality (VR) protocol can help overcome the psychological burden of the Coronavirus by relieving anxiety, improving well-being, and reinforcing social connectedness. The protocol will be based on the 'Secret Garden' 360 VR video online (www.covidfeelgood.com) which simulates a natural environment aiming to promote relaxation and self-reflection. Three hundred sixty-degree or spherical videos allow the user to control the viewing direction. In this way, the user can explore the content from any angle like a panorama and experience presence and immersion. The 'Secret Garden' video is combined with daily exercises that are designed to be experienced with another person (not necessarily physically together), to facilitate a process of critical examination and eventual revision of core assumptions and beliefs related to personal identity, relationships, and goals. Methods: This is a multicentric, pragmatic pilot randomized controlled trial involving individuals who experienced the COVID-19 pandemic and underwent a lockdown and quarantine procedures. The trial is approved by the Ethics Committee of the Istituto Auxologico Italiano. Each research group in all the countries joining the pragmatic trial, aims at enrolling at least 30 individuals in the experimental group experiencing the self-help protocol, and 30 in the control group, over a period of 3 months to verify the feasibility of the intervention. Conclusion: The goal of this protocol is for VR to become the 'surgical mask' of mental health treatment. Although surgical masks do not provide the wearer with a reliable level of protection against the coronavirus compared with FFP2 or FFP3 masks, surgical masks are very effective in protecting others from the wearer's respiratory emissions. The goal of the VR protocol is the same: not necessarily to solve complex mental health problems but rather to improve well-being and preserve social connectedness through the beneficial social effects generated by positive emotions

A multi-element psychosocial intervention for early psychosis (GET UP PIANO TRIAL) conducted in a catchment area of 10 million inhabitants: study protocol for a pragmatic cluster randomized controlled trial

Multi-element interventions for first-episode psychosis (FEP) are promising, but have mostly been conducted in non-epidemiologically representative samples, thereby raising the risk of underestimating the complexities involved in treating FEP in 'real-world' services

Running economy of elite east African runners

Endurance running velocity (v) is equal to: v = (Fâ¢Vâ™O2max)/Cr where Vâ™O2max is maximal oxygen uptake, F is the fraction of Vâ™O2max that can be utilised throughout the effort and Cr is the energy cost of running. Therefore, the outstanding results obtained by east African runners in marathon and half-marathon are likely due to their: i) very high Vâ™O2max: ii) low Cr (high running economy); iii) large F, or by the interplay of these three factors. PURPOSE: To assess Vâ™O2max and Cr in a group of top level Kenyan marathon runners. In addition, on the basis of the average v maintained during marathons, individual F values were also estimated. METHODS: Experiments were carried out on track (Eldoret, Kenya, altitude 2000 m asl) on 13 elite Kenyan runners (29.8 yy ± 3.3; 58.3 kg ± 4.7; 173 cm ± 9.3, average record v during marathon: 19.6 km/hr ± 0.36). Cr was assessed by measuring Vâ™O2 at steady state (Vâ™O2ss) at constant speed during an incremental test. Initial v was set at 12 km/hr, each step lasted 4 minutes and v was increased by 2 km/hr at each step. Blood lactate concentration ([La]b) was measured after each step. Vâ™O2max was defined by the plateau attained in the Vâ™O2ss vs v relation above a given v. Net Cr in mL O2/kmâ¢kg was calculated as the ratio of net Vâ™O2ss to the corresponding average v. F was then calculated for each subjects: i) as F = (vâ¢Cr)/Vâ™O2max)/Cr knowing individual marathon best performances; and ii) calculating the Vâ™O2 corresponding to the v found at a La]b of 2 mM (v2). RESULTS: Maximal v during the test was 19.9 km/hr ± 0.36. Vâ™O2max corrected to sea level condition amounted to 62.6 mL O2/minâ¢kg ± 5.6 and Cr turned out to be equal to 173 mL O2/kmâ¢kg ± 13.2. F estimated from record v, Cr and Vâ™O2max was equal to 0.90 ± 0.06 and agreed with that estimated from v2 (0.89 ± 0.07). The present runners had a Vâ™O2max on average about 21 % smaller than, and a Cr equal to, that previously found in younger less competitive Kenyan runners. No comparison with previous F values was possible. CONCLUSIONS: Results indicate that elite Kenyan marathoners: i) have a relatively low Vâ™O2max; ii) have a very low Cr; and iii) have an extremely high F in comparison with elite Caucasian runners. Both ii) and iii) compensate for i) and thus may entirely explain their excellent performances