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1.
J Environ Manage ; 285: 112064, 2021 Feb 14.
Artigo em Inglês | MEDLINE | ID: mdl-33588169

RESUMO

Powering electrochemical technologies with renewable energies is a promising way to get more sustainable environmental remediation techniques. However, the operational conditions of those processes must be optimized to undergo fast and efficient treatments. In this work, the influence of electrical and hydraulic connections in the performance of a set of two electrolyzers directly powered by photovoltaic panels was evaluated. Despite both electrolyzers were assembled using the same electrode material, they showed different performances. Results indicate that the electrolyzer with higher ohmic resistance and higher overpotential attained a greater production of oxidant species, being produced under the most efficient strategy around 4.8 and 15.1 mmol of oxidants per Ah by electrolyzer 1 and 2, respectively. Nevertheless, an excess of oxidant production because of an inefficient energy management, led to low removal efficiencies as a consequence of a waste of energy into undesirable reactions. Regarding the hydraulic distribution of wastewater between the cells, it was found to influence on the total remediation attained, being the serial connection 2.5 and 1.8 more efficient than a parallel wastewater distribution under series and parallel electrical strategies, respectively. Regarding electrical strategies, parallel connections maximize the use of power produced by the photovoltaic panels. Furthermore, this allows the system to work under lower current densities, reducing the mass transfer limitations. Considering both advantages, a hydraulic connection of the cells in series and an electrical connection in parallel was found to reach the highest specific removal of pollutant, 2.52 mg clopyralid (Wh)-1. Conversely, the opposite strategy (parallel hydraulic connection-series electrical connection) showed the lowest remediation ratio, 0.48 mg clopyralid (Wh)-1. These results are important to be considered in the design of electrolytic treatments of waste directly powered by photovoltaic panels, because they show the way to optimize the cells stack layout in full-scale applications, exhibiting significant impact on the sustainability of the electrochemical application.

2.
J Environ Manage ; : 111597, 2020 Nov 07.
Artigo em Inglês | MEDLINE | ID: mdl-33168294

RESUMO

This work aims to assess the influence of ultrasounds (US) application or ultraviolet (UV) light irradiation on the efficiency and sustainability of the treatment of wastes by conductive diamond electrochemical oxidation (CDEO). To do this, a life cycle assessment (LCA) is carried out in order to quantify the environmental impacts of the intensified CDEO processes. Inventories of three bench scale remediation plants (CDEO, Sono-CDEO and Photo-CDEO) in which the different technologies are implemented are performed by means of Ecoinvent 3.3 data base. AWARE, USEtox, IPPC and ReCiPe methodologies are used to quantify the environmental burden into 5 midpoint (water footprint, global warming 100a, ozone layer depletion, human toxicity, freshwater ecotoxicity) and 17 endpoint impact categories. Photo-CDEO attains the faster and more efficient removal in terms of energy consumed. All impact categories are lower in the case in which UV light irradiation is coupled to the CDEO treatment, particularly if the electrolyte does not contain chloride anions. From the point of view of toxicity and ecotoxicity, it is essential to achieve a complete mineralization, because of the intermediates generated into wastes containing chloride anions can become more hazardous than the initial pesticide. The operation of these technologies at large current densities shows positive results from the sustainability point of view, despite the huge environmental impact related to the energy production. Data notice that almost a 99.0% of the total global warming potential is mainly due to the electricity required during the electrochemical treatment, being higher by the sono and photo CDEO treatments because of the use of additional devices. Nevertheless, this issue can be overcome by means of using renewable energies as power sources of these remediation treatments. According to results, it can be claimed that the electrochemical technologies may successfully compete with other AOPs in terms of sustainability.

3.
Arq. bras. med. vet. zootec. (Online) ; 72(5): 1874-1880, Sept.-Oct. 2020. tab
Artigo em Inglês | LILACS-Express | LILACS | ID: biblio-1131528

RESUMO

ABSTRACT The objective of this study was to evaluate, for two years, the performance of 124 female and 105 male Braford calves born during the first and second halves of the same calving season and the effects of birth period on the development of males until slaughter, as yearlings, and of females until calving, after having mated at 13-15 months of age. Early-born females were heavier than those born late at weaning (119.3 vs 109.9kg; P<0.05), at the start of the breeding season (275.0 vs 263.0kg; P<0.05), and at the end of the breeding season (300.0 vs 289.5kg; P<0.05), in addition to being more fertile (70 vs 50% pregnancy rate). There was no difference (P>0.05) in the development of males born early in relation to those born late, except for weaning weight, which was higher in the former. Steers born early were ready for slaughter at a younger age (459.6 vs 490.1 days; P<0.05), and both groups (early- and late-born) had a body condition classified as fat (4.21 points). In intensive production systems, both male and female calves perform better if they are born during the first half of the calving season.


RESUMO O objetivo deste estudo foi avaliar, por dois anos, o desempenho de 124 bezerras e 105 bezerros Braford nascidos durante a primeira e segunda metades da mesma estação, bem como os efeitos do período de nascimento no desenvolvimento dos machos até o abate e das fêmeas até o primeiro parto, após serem acasalados entre 13/15 meses de idade. As fêmeas nascidas precocemente foram mais pesadas do que as nascidas tardiamente ao desmame quando bezerras (119,3 vs. 109,9kg; P<0,05), no início da estação reprodutiva (275,0 vs. 263,0kg; P<0,05) e no final da estação reprodutiva (300,0 vs. 289,5kg; P<0,05), além de terem maior fertilidade (taxa de prenhez 70 vs. 50%). Não houve diferença (P>0,05) no desenvolvimento de bezerros nascidos precocemente em relação aos nascidos mais tardiamente, exceto no peso ao desmame, com superioridade dos primeiros. Os novilhos nascidos mais cedo ficaram prontos para o abate à idade mais jovem (459,6 vs. 490,1 dias; P<0,05), e ambos os grupos (nascidos precoce e tardiamente) tinham uma condição corporal classificada como gordura (4,21 pontos). Em sistemas de produção intensiva, os bezerros machos e fêmeas nascidos precocemente, na primeira metade da estação de parição, possuem melhor desempenho.

4.
J Environ Manage ; 267: 110665, 2020 Aug 01.
Artigo em Inglês | MEDLINE | ID: mdl-32421682

RESUMO

The electro-kinetic remediation of soils using different powering strategies has been studied, in order to clarify which is the best strategy to couple solar powering with this remediation technology, in a context of developing more sustainable electrochemical remediation technologies. Direct powering from photovoltaic panels (Case a), application of constant electric fields with the same average value of Case a (Case b) and application of constant specific power with the same average value of Case a (Case c) have been compared. Results show an outstanding influence of the powering strategy on the removal efficiency of clopyralid (model of herbicide used in this work). The direct use of solar power profiles obtained the lowest removal efficiencies, which contrasts with the higher expected sustainability of this powering strategy. Reversion of pollutant transport overnight and extreme electric field values at noon help to explain the lower efficiency of this strategy. Evaporation mechanisms are promoted by operating at extreme large electric fields. In addition, harsher conditions lead to a higher negative soil affectation in terms of regions affected by extreme pHs, water contents and/or conductivities and to lower specific pollutant removals. Therefore, maximum efficiencies were found for Case b (constant electric potential gradient) with a total removal over 110 g kWh-1 and only a slight affectation into the final soil properties.


Assuntos
Recuperação e Remediação Ambiental , Herbicidas , Poluentes do Solo , Energia Solar , Solo
5.
Chemosphere ; 254: 126795, 2020 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-32334253

RESUMO

In this work, the use in fuel cell mode of three electro-absorbers is evaluated for the chloralkaline process and performance is compared with that of a conventional PEMFC operated at the same operation conditions (room temperature). To do this, four cells have been in-house manufactured and compared, in order to determine which electrolyte (solution containing the active species or the membrane) is the best and which is the influence of the absorption stage on the operation of the cell. Because of the high solubility of chlorine, only the hydrogen absorption has been considered in order to evaluate relevant differences in the performance. Results demonstrate that design of the cell has a superb significance on the performances obtained. Cells with membrane-electrode assemblies are more efficient than those in which the membrane is used only as an electrodic compartment separator and utilization of devices which produce tiny bubbles of gas into the electrolyte is also very advantageous in order to obtain higher efficiencies. Results are of a great significance for the design of electro-absorbers and this paper is a first approach to face the design of reversible electrochemical cells for the chloralkaline process.


Assuntos
Fontes de Energia Elétrica , Eletrodos , Eletrólitos , Hidrogênio , Fenômenos Físicos
6.
J Environ Manage ; 265: 110566, 2020 Jul 01.
Artigo em Inglês | MEDLINE | ID: mdl-32275236

RESUMO

This work focuses on disinfection of water using electrolysis with diamond coatings avoiding or minimizing the formation of hazardous chlorates and perchlorates using a special type of commercial cells designed by CONDIAS (Itzehoe, Germany) in two different sizes: the CabECO and the MIKROZON cells. In these cells, the electrolyte that separates the anode and cathode is a proton exchange membrane. This helps to minimize the production of perchlorate and this behavior is enhanced in the smallest cell for which the very low contact times between the electrodes and the water allows to avoid the production of perchlorates when operating in a single-pass mode, which becomes a really remarkable point. In this paper, we report tests in which we demonstrate this outstanding performance and we also explain the differences observed in the two cells operating with the same water.


Assuntos
Cloratos , Poluentes Químicos da Água , Diamante , Desinfecção , Eletrodos , Alemanha , Oxirredução , Percloratos
7.
Sci Total Environ ; 725: 138379, 2020 Jul 10.
Artigo em Inglês | MEDLINE | ID: mdl-32278177

RESUMO

This work focuses on disinfection of water using electrolysis with boron doped diamond (BDD) coatings and faces this challenge by comparing the performance of two different cells manufactured by CONDIAS GmbH (Izehoe, Germany): CONDIACELL® ECWP and CabECO cells. They are both equipped with diamond electrodes, but the mechanical design is completely different, varying not only by geometry but also by the flow conditions. ECWP is a flow-through cell with perforated electrodes while the CabECO cell is a zero-gap cell with a proton exchange membrane as a solid polymer electrolyte (SPE) separating the anode and cathode. At 0.02 Ah dm-3 both cells attain around 3-5 logs pathogen removal, but design and sizing parameters give an advantage to the CabECO: it can minimize the production of chlorates and perchlorates when operating in a single-pass mode, which becomes a really remarkable point. In this paper, we report tests in which we demonstrate this outstanding performance and we also explain the differences observed in the two cells operating with the same water.

8.
Ann Hematol ; 98(8): 1937-1946, 2019 Aug.
Artigo em Inglês | MEDLINE | ID: mdl-30949752

RESUMO

The identification of high-risk patients deserving alternative first-line treatments to R-CHOP is a research priority in diffuse large B cell lymphoma (DLBCL). Despite the increasing recognition of biological features underlying aggressive behavior, clinical scores remain the basis for prognostic evaluation and treatment stratification in DLBCL. We performed a retrospective analysis of patients with DLBCL uniformly treated with immunochemotherapy with the aim of assessing the discriminative power of the NCCN international prognostic index (IPI) and the GELTAMO-IPI scores in risk group stratification and compared them with the IPI. Additionally, we investigated if bulky disease, gender, beta-2 microglobulin (ß2m), body mass index, and B-symptoms have independent prognostic impact. We confirmed the discriminative ability of the three prognostic scores in terms of progression-free survival and overall survival and found that the NCCN-IPI performs better in the identification of a high-risk population compared to the IPI and the GELTAMO scores. In an attempt to improve the prognostic power of the NCCN-IPI we analyzed additional clinical variables. Bulky disease and elevated ß2m were found to be independent predictors of prognosis when controlling for the NCCN-IPI risk groups. However, they seem to bring no incremental power to the latter in the identification of poor outcome patients. We support the use of the NCCN-IPI for the clinical identification of high-risk patients in DLBCL. Future studies to unravel the biological heterogeneity within NCCN-IPI groups are needed to improve risk prediction and design targeted therapies for poor prognosis patients.


Assuntos
Linfoma Difuso de Grandes Células B/tratamento farmacológico , Seleção de Pacientes , Projetos de Pesquisa , Microglobulina beta-2/sangue , Adolescente , Adulto , Fatores Etários , Idoso , Idoso de 80 Anos ou mais , Anticorpos Monoclonais Murinos/uso terapêutico , Protocolos de Quimioterapia Combinada Antineoplásica/uso terapêutico , Ciclofosfamida/uso terapêutico , Doxorrubicina/uso terapêutico , Feminino , Humanos , Linfoma Difuso de Grandes Células B/classificação , Linfoma Difuso de Grandes Células B/diagnóstico , Linfoma Difuso de Grandes Células B/mortalidade , Masculino , Pessoa de Meia-Idade , Prednisona/uso terapêutico , Prognóstico , Estudos Retrospectivos , Fatores de Risco , Rituximab , Fatores Sexuais , Análise de Sobrevida , Vincristina/uso terapêutico
9.
J Biotechnol ; 282: 70-79, 2018 Sep 20.
Artigo em Inglês | MEDLINE | ID: mdl-29990569

RESUMO

This paper is focused on the assessment of the production of algae in batch bioreactors. Hydraulic retention time, carbon loading rate and light color were the inputs of the study and algae production the main output. Bioreactors were operated in semi-continuous mode and tests lasted two months, more than two times the period required to meet a steady-state response. This steady-state was verified with plateau responses in both, soluble parameters and suspended solids. Results points out the great relevance of temperature. Likewise, they show that green light improves the production of algae, as well as long HRT and high CLR. Maximum production rates attained were in the range 4-14 mg d-1 L-1. The ratio COD /TSS for this biofuel was almost constant (3.13 mg COD mg-1 TSS) but the quality of the product obtained in terms of the Mean Oxidation State of Carbon is completely different. Longer HRT leads to lower MOSC and hence to potentially more valuable fuels.


Assuntos
Reatores Biológicos , Chlorella vulgaris , Luz , Microalgas , Análise da Demanda Biológica de Oxigênio , Carbono/metabolismo , Chlorella vulgaris/crescimento & desenvolvimento , Chlorella vulgaris/metabolismo , Chlorella vulgaris/efeitos da radiação , Clorofila/metabolismo , Microalgas/crescimento & desenvolvimento , Microalgas/metabolismo , Microalgas/efeitos da radiação , Fatores de Tempo
10.
J Environ Manage ; 222: 135-140, 2018 Sep 15.
Artigo em Inglês | MEDLINE | ID: mdl-29807263

RESUMO

This work presents the design and evaluation of a new concept of pre-disinfection treatment that is especially suited for highly polluted surface water and is based on the combination of coagulation-flocculation, lamellar sedimentation and filtration into a single-column unit, in which the interconnection between treatments is an important part of the overall process. The new system, the so-called PREDICO (PRE-DIsinfection Column) system, was built with low-cost consumables from hardware stores (in order to promote in-house construction of the system in poor countries) and was tested with a mixture of 20% raw wastewater and 80% surface water (in order to simulate an extremely bad situation). The results confirmed that the PREDICO system helps to avoid fouling in later electro-disinfection processes and attains a remarkable degree of disinfection (3-4 log units), which supplements the removal of pathogens attained by the electrolytic cell (more than 4 log units). The most important sizing parameters for the PREDICO system are the surface loading rate (SLR) and the hydraulic residence time (HRT); SLR values under 20 cm min-1 and HRT values over 13.6 min in the PREDICO system are suitable to warrant efficient performance of the system.


Assuntos
Águas Residuárias , Purificação da Água , Desinfecção , Filtração , Poluição da Água
11.
J Biomed Mater Res A ; 106(8): 2141-2150, 2018 08.
Artigo em Inglês | MEDLINE | ID: mdl-29603876

RESUMO

Membranes design for guided tissue engineering have been studied to aid in cell viability and function as tissue barriers. Two asymmetric resorbable membranes for guided bone regeneration (GBR) were produced: chitosan/pectin/poly-caprolactone (PECm) and poly(vinyl alcohol)/polyethylenimine/poly(ethylene glycol) (PVAm). Both membranes were characterized by physical, chemical, mechanical, degradation rate, and in vitro biological assessment. Scanning electron microscopy (SEM) confirmed the membranes asymmetry, in which PECm asymmetry is given by roughness and chemical composition, while PVAm's only by differences in porosity. Fourier transform infrared spectroscopy (FTIR) identified chemical groups and bonds between polymers. Both sides of PVAm revealed to be hydrophobic, whereas the PECm presented one side with higher hydrophobicity than the other. In vitro biological assessment disclosed that PECm presented a higher cell adhesion growth pattern than PVAm, where it seemed to occur a delay in proliferation due to initial low cell adhesion. Both developed membranes are suitable for GBR, since both membranes fulfil the requirements to be used as a tissue barrier. The PECm has an additional role in cell viability that was not observed in the PVAm. © 2018 Wiley Periodicals, Inc. J Biomed Mater Res Part A: 106A: 2141-2150, 2018.


Assuntos
Regeneração Óssea/fisiologia , Regeneração Tecidual Guiada/métodos , Membranas Artificiais , Morte Celular , Linhagem Celular Tumoral , Fibroblastos/citologia , Humanos , Polímeros/química , Espectroscopia de Infravermelho com Transformada de Fourier , Eletricidade Estática , Molhabilidade
12.
Rev. Soc. Esp. Dolor ; 23(4): 181-185, jul.-ago. 2016. tab
Artigo em Espanhol | IBECS | ID: ibc-154044

RESUMO

Introducción: Desde el año 2000 vienen apareciendo en distintas publicaciones científicas los resultados de numerosos estudios experimentales realizados en animales, evaluando el impacto neurotóxico que sobre sus cerebros tenía la exposición a combinaciones de anestésicos de uso habitual. Se constata que la exposición en periodo de máxima sinaptogénesis conlleva una apoptosis neural diseminada. Comienzan entonces a preocuparse los anestesiólogos que trabajan con niños, pues quizás ese daño neuronal también pudiera acontecer a la población pediátrica. Así, son varios los estudios que están en marcha desde hace años valorando el desarrollo neurocognitivo de cohortes de niños que se sometieron a anestesias generales en edades tempranas de sus vidas. En este sentido, la necesidad de medir un daño cerebral agudo nos anima a utilizar marcadores que han demostrado su asociación con dicho deterioro cerebral en diferentes situaciones clínicas como la hipoxia perinatal, la parada cardiorrespiratoria o el traumatismo craneoencefálico. Objetivos: Planteamos este trabajo con el objetivo de determinar si la proteína S100B podría comportarse como un biomarcador de daño cerebral agudo postanestésico y si pudiéramos establecer asociación entre la elevación de este marcador en sangre y alguno de los fármacos anestésicos utilizados habitualmente. Metodología: Determinación sanguínea de la proteína S100B en 76 pacientes pediátricos intervenidos de hipertrofia amigdalar bajo anestesia general, antes y después de la cirugía Conclusión: Tras analizar los resultados podemos concluir que existe una elevación estadísticamente significativa entre los niveles de proteína S100B antes y después de la exposición anestésica. En segundo lugar, podemos establecer una correlación positiva, también con significación estadística, entre el fentanilo administrado y la elevación de dicha proteína al final del acto anestésico (AU)


Introduction: In the last decade many scietific publications bring out the results of experimental studies about the neurotoxic impact of an anesthetic expossure in animal´s brain. It is confirm that when this expossure occurs in a maximum synaptogenesis period of the animal´s live a widespread neuroapoptosis befall. From there on all the pediatrics anesthesiologist warried about if this damage could also affect the pediatric population. Nowadays there are several observational studies exploring the neurobehavioral conduct of many children who underwent general anesthesia early in their lives. Objetive: As a results of this we propose to use actual neuronal damage biomarkes, wich have demonstrated association between brain damage and perinatal hypoxia, or cardiac arrest or mild brain injury. When we planned this essay we intend to determine if S100B protein could work as an accute postanesthetic expossure neuronal damage biomarker, and if there would be any relationship between the biomarker elevation and any of the drugs commonly use for anesthesia. Metodology: In order to determinate the S100B protein serum level is, we obtained a blood sample before and after general anaesthesia expousure in 76 paediatric patient undergoing amigdalar hypertropy surgery. Conclusions: Once we analized our results we can coclude that an elevation of the blood levels of S100B protein occurs after anesthesia. We have also found a possitive correlation between the total amount of fentanyl administred and the higher level of this protein concentration at the end of the anesthetic expossure (AU)


Assuntos
Humanos , Masculino , Feminino , Criança , Peptídeos Opioides/efeitos adversos , Peptídeos Opioides/toxicidade , Analgésicos Opioides/efeitos adversos , Analgésicos Opioides/toxicidade , Anestesia Geral , Proteína Inibidora de Apoptose Neuronal/análise , Proteínas S100/análise , Biomarcadores/análise , Anestesia Geral/efeitos adversos , Estudos de Coortes , Fentanila/efeitos adversos , Fentanila/uso terapêutico
13.
Water Res ; 99: 16-23, 2016 08 01.
Artigo em Inglês | MEDLINE | ID: mdl-27130968

RESUMO

This manuscript focuses on the evaluation of the use of different types and dosages of fuels in the performance of double-compartment microbial fuel cell equipped with carbon felt electrodes and cationic membrane. Five types of fuels (ethanol, glycerol, acetate, propionate and fructose) have been tested for the same organic load (5,000 mg L(-1) measured as COD) and for one of them (acetate), the range of dosages between 500 and 20,000 mg L(-1) of COD was also studied. Results demonstrate that production of electricity depends strongly on the fuel used. Carboxylic acids are much more efficient than alcohols or fructose for the same organic load and within the range 500-5,000 mg L(-1) of acetate the production of electricity increases linearly with the amount of acetate fed but over these concentrations a change in the population composition may explain a worse performance.


Assuntos
Fontes de Energia Bioelétrica , Eletricidade , Acetatos/metabolismo , Eletrodos , Etanol
14.
Biotechnol Prog ; 32(4): 883-90, 2016 07 08.
Artigo em Inglês | MEDLINE | ID: mdl-27072066

RESUMO

In this work, the long-term effects of transient chemical oxygen demands (COD) concentrations over the performance of a microbial fuel cell were studied. From the obtained results, it was observed that the repetitive change in the COD loading rate during 12 h conditioned the behavior of the system during periods of up to 7 days. The main modifications were the enhancement of the COD consumption rate and the exerted current. These enhancements yielded increasing Coulombic efficiencies (CEs) when working with COD concentrations of 300 mg/L, but constant CEs when working with COD concentrations from 900 to 1800 mg/L. This effect could be explained by the higher affinity for the substrate of Geobacter than that of the nonelectrogenic organisms such as Clostridia. © 2016 American Institute of Chemical Engineers Biotechnol. Prog., 32:883-890, 2016.


Assuntos
Fontes de Energia Bioelétrica , Análise da Demanda Biológica de Oxigênio , Técnicas Eletroquímicas , Geobacter/metabolismo , Fatores de Tempo
15.
Bioresour Technol ; 189: 94-98, 2015.
Artigo em Inglês | MEDLINE | ID: mdl-25876228

RESUMO

This work is focused on the removal of sulphide from wastewater using a two chamber microbial fuel cell, seeded with activated sludge and operated in semi-continuous mode. Two co-substrates were used in order to provide the system for carbon and nutrient source: actual urban wastewater and synthetic wastewater. Results show that sulphide is efficiency depleted (removals over 94%) and that electricity is efficiently produced (maximum power density is 150 mW m(-2)) meanwhile COD is also oxidised (removals higher than 60%). Sulphur and sulphate are obtained as the final products of the oxidation and final speciation depends on the type of co-substrate used. The start-up of the system is very rapid and production of electricity and polarisation curves do not depend on the co-substrate.


Assuntos
Fontes de Energia Bioelétrica , Biotecnologia/métodos , Eletricidade , Eletrodos , Esgotos/química , Sulfetos/análise , Fatores de Tempo , Águas Residuárias/química
16.
Meat Sci ; 98(3): 336-45, 2014 Nov.
Artigo em Inglês | MEDLINE | ID: mdl-25017318

RESUMO

With a herd of 209 million cattle, Brazilian beef production estimate for 2023 is 10,935 million tons, representing an increase of 28.9% and accounting for 20% of the world trade. Beef cattle production is constantly evolving; however, there are extremes, ranging from simple existing farm ranges to intensive forage systems, strategic supplementation, updated health and genetic improvement programs for the production of quality beef. This modern production is based on scientific research carried out at universities and other research institutions. A new generation of professionals with multidisciplinary knowledge and a holistic vision of the productive chain-proposed management practices to reduce greenhouse gas emissions in the production of grass-fed beef cattle, whose meat has high omega-3 and CLA contents. Age at slaughter of steers and of heifers at first mating, significant increases in the ratio calves/100 cows, adequate traceability for pastoral systems with hundreds or thousands of animals per farm and a more intense transference of technology are required.


Assuntos
Ração Animal , Criação de Animais Domésticos , Conservação dos Recursos Naturais , Dieta , Ácidos Graxos Insaturados , Saúde , Carne , Animais , Brasil , Bovinos , Indústria Alimentícia , Efeito Estufa , Humanos , Valor Nutritivo , Poaceae
17.
Bioresour Technol ; 159: 451-4, 2014 May.
Artigo em Inglês | MEDLINE | ID: mdl-24709531

RESUMO

The possibility to develop devices based on bioprocesses for solar energy harvesting is significant from the economic and environmental point of view. In this communication it has been demonstrated that such device can be can be made by controlling the equilibrium between photosynthetic and electrogenic cultures. This device is a membrane-less and mediator-free apparatus with a graphite plate anode and a stainless steel grid cathode with a steady electricity production of about 1 mV m(-2).


Assuntos
Fontes de Energia Bioelétrica , Energia Solar , Eletricidade , Eucariotos/metabolismo , Oxigênio/metabolismo
18.
Meat Sci ; 96(1): 353-60, 2014 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-23954275

RESUMO

Chemical and mineral composition and the intramuscular fatty acid (IMF) profile of the Longissimus dorsi muscle (LM) of 60 purebred Hereford, 1/4 Braford and 3/8 Braford steers finished either in a feedlot or on improved pastures of the Pampa biome were evaluated. Pastures were improved with the introduction of Lolium multiflorum, Trifolium repens, and Lotus corniculatus. On average, beef from pasture-fed steers presented higher concentrations of the fatty acids C18:3n-3 (P<0.001), C20:3n-3 (P=0.035), total n-3 (P<0.001) and lower n-6/n-3 ratio (P<0.001) in the IMF, and higher Mg and lower K content in muscle relative to those finished in the feedlot. C12:0 concentration in IMF was higher (P=0.027) for 3/8 Braford than the purebred Hereford steers, whereas purebred Herefords presented lower C14:1 (P=0.003) and higher C18:0 (P=0.022) concentrations than the two Braford groups. The meat composition of purebred Hereford and Braford steers was not substantially different; however, beef produced exclusively on improved pastures presented higher concentration of components that are considered beneficial to human health, such as n-3 fatty acids, and a lower n-6/n-3 ratio.


Assuntos
Ração Animal/análise , Carne/análise , Valor Nutritivo , Tecido Adiposo/química , Animais , Composição Corporal , Brasil , Bovinos , Colesterol/análise , Dieta/veterinária , Ácidos Graxos Ômega-3/análise , Ácidos Graxos Ômega-6/análise , Lolium , Lotus , Masculino , Músculo Esquelético/química , Oligoelementos/análise , Trifolium
19.
Clin Microbiol Infect ; 20(5): 447-52, 2014 May.
Artigo em Inglês | MEDLINE | ID: mdl-24033793

RESUMO

Leprosy epidemiological studies have been restricted to Mycobacterium leprae DNA detection in nasal and oral mucosa samples with scarce literature on peripheral blood. We present the largest study applying quantitative real-time PCR (qPCR) for the detection of M. leprae DNA in peripheral blood samples of 200 untreated leprosy patients and 826 household contacts, with results associated with clinical and laboratory parameters. To detect M. leprae DNA a TaqMan qPCR assay targeting the M. leprae ML0024 genomic region was performed. The ML0024 qPCR in blood samples detected the presence of bacillus DNA in 22.0% (44/200) of the leprosy patients: 23.2% (16/69) in paucibacillary (PB), and 21.4% (28/131) in multibacillary (MB) patients. Overall positivity among contacts was 1.2% (10/826), with similar percentages regardless of whether the index case was PB or MB. After a follow-up period of 7 years, 26 contacts have developed leprosy. Comparing the results of healthy contacts with those that become ill, ML0024 qPCR positivity at the time of diagnosis of their index case represented an impressive 14.78-fold greater risk for leprosy onset (95% CI 3.6-60.8; p <0.0001). In brief, contacts with positive PCR in blood at diagnosis of index cases are at higher risk of later leprosy onset and this marker might be combined with other prognostic markers for management of contacts, which requires further studies.


Assuntos
DNA Bacteriano/sangue , Hanseníase Multibacilar/sangue , Hanseníase Multibacilar/transmissão , Hanseníase Paucibacilar/sangue , Hanseníase Paucibacilar/transmissão , Mycobacterium leprae/genética , Proteínas de Bactérias/genética , Portador Sadio/sangue , Seguimentos , Humanos , Hanseníase Multibacilar/epidemiologia , Hanseníase Paucibacilar/epidemiologia , Mycobacterium leprae/isolamento & purificação , Reação em Cadeia da Polimerase em Tempo Real , Fatores de Risco
20.
Clín. investig. ginecol. obstet. (Ed. impr.) ; 40(2): 58-61, mar.-abr. 2013. ilus, tab
Artigo em Espanhol | IBECS | ID: ibc-110848

RESUMO

Objetivo El propósito fue evaluar la prevalencia del carcinoma hallado en la biopsia quirúrgica de lesiones identificadas como una hiperplasia ductal atípica en la biopsia percutánea de mama. Método Presentamos un estudio retrospectivo de todas las pacientes asintomáticas que tuvieron una hiperplasia ductal atípica en la biopsia percutánea de mama y fueron sometidas a una escisión quirúrgica entre enero de 2002 y diciembre de 2010.ResultadosSesenta y ocho pacientes fueron diagnosticadas de hiperplasia ductal atípica en la biopsia de mama percutánea y fueron evaluadas con una biopsia quirúrgica. Diecisiete (25%) pacientes tuvieron un carcinoma tras la escisión quirúrgica, 10 tuvieron un carcinoma in situ y 7 pacientes un carcinoma invasivo. Analizamos las características mamográficas asociadas a malignidad. Conclusiones El hallazgo de una hiperplasia atípica en la biopsia percutánea de mama es una indicación para la escisión quirúrgica porque frecuentemente corresponde a un cáncer (AU)


Objetive The purpose was to evaluate the prevalence of carcinoma found at surgical biopsy of llesions identified as atypical ductal hyperplasia by percutaneous breast biopsy. Methods We performed a retrospective study of all asymptomatic patients with a result of atypical ductal hyperplasia on percutaneous breast biopsy and who underwent surgical excision from January 2002 to December 2010.ResultsSixty-eight patients were found to have atypical ductal hyperplasia at percutaneous breast biopsy and were evaluated with surgical biopsy. Seventeen patients (25%) had carcinoma at surgical excision, 10 had ductal carcinoma in situ, and 7 patients had invasive carcinoma. The mammographic characteristics associated with malignancy were analyzed. Conclusions A finding of atypical ductal hyperplasia at percutaneous breast biopsy frequently corresponds to cancer and is therefore an indication for surgical excision (AU)


Assuntos
Humanos , Feminino , Neoplasias da Mama/patologia , Carcinoma Ductal de Mama/patologia , Biópsia por Agulha Fina , Mastectomia , Estudos Retrospectivos
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