302 research outputs found
Pyridoxine analysis by high performance liquid chromatography and validation in fortified milk powder
Vitamin B6 analysis by reverse-phase high performance liquid chromatography and its validation in milk powder prompted this study. The calibration curves for pyridoxal, pyridoxamine and pyridoxine were evaluated and method precision and accuracy assessed. It was found that the working range was adequate for all the analytes. The analytical procedure was verified by testing the enzymatic efficiency, precision and accuracy. In milk powder samples pyridoxine was the only vitamer found in quantities above the considered limit of quantification and the accuracy showed Z-scores lower than 2. Uncertainty estimation based on method validation results was 0.066 mg/100g, for a vitamin B6 content of 0.61 mg/100 g. It was concluded that the method is adequate for vitamin B6 quantification in powder milk
Residual Biomass: A Comprehensive Review on the Importance, Uses and Potential in a Circular Bioeconomy Approach
ReviewThe paradigm shift towards sustainable growth is urgent, and biomass, which is the oldest
energy source that humans have used since the discovery of fire, might play an important role.
Biomass waste from forestry and agriculture is expected to fuel part of the increasing demand for
biomass, and its valorization allows for more the efficient use of nutrients and resources. In this study,
we carried out an extensive literature review on the valorization of residual agroforestry biomass
since the 1970s to understand the leading research focuses on the subject over the last few decades,
identify the most recent trends, and establish a possible solution path for the future of biomass. It was
observed that most studies focused on biomass as being capable of replacing fossil energy sources.
According to the literature, biomass has the most significant potential to meet requirements and
ensure fuel supplies in the future. The developments of the last decades have significantly improved
the conversion processes, leading to greener solutions, but there is still much to be studied and
put into practice. Closing the loop into biomass waste recovery will be essential for a genuinely
circular bioeconomyinfo:eu-repo/semantics/publishedVersio
Assessment of Woody Residual Biomass Generation Capacity in the Central Region of Portugal: Analysis of the Power Production Potential
Biomass is an alternative energy source with high potential to contribute to the global
energy mix and to countries’ energetic independence. The case of Portugal is particularly relevant,
given its biomass availability. Thus, the quantification of woody residual biomass is assumed to
be urgent. To achieve the objective of quantifying residual woody biomass, various available data
were used, namely the Land Cover and Soil Use Map (COS 2018), from which areas occupied by
different categories were selected as being the most relevant. Then, based on coefficients previously
established, the amounts of residual woody biomass were determined, namely for maritime pine
forests, eucalyptus forests, scrubland, vineyards, olive groves, and orchards. Then, the potential
for generating electricity was estimated. It was found that for the hypothetical scenario of the total
conversion of the recently closed Pêgo coal power plant to biomass, the available amounts of residual
woody biomass in the country would not be sufficient to ensure the operation. On the other hand, if
the power plant only worked as a backup unit, the available quantities could ensure its operation
and contribute to creating a value chain for residual woody biomass of forest and agricultural origin
within a circular economy and sustainable development approachinfo:eu-repo/semantics/publishedVersio
Reducing Rural Fire Risk through the Development of a Sustainable Supply Chain Model for Residual Agroforestry Biomass Supported in aWeb Platform: A Case Study in Portugal Central Region with the Project BioAgroFloRes
In the European Mediterranean region, rural fires are a widely known problem that cause
serious socio-economic losses and undesirable environmental consequences, including the loss of
lives, infrastructures, cultural heritage, and ecosystem services such as carbon sequestration and the
provisioning of raw materials. In the last decades, the collapse of the traditional rural socioeconomic
systems that once characterized the Mediterranean region, along with land-use changes, have created
conflicts and additional driving factors for rural fires. Within Europe, Portugal is the most affected
country by rural fires. This work intends to demonstrate the importance of recovering and valorizing
residual agroforestry biomass to reduce rural fire risk in Portugal, and thus contributing to a fire
resilient landscape. From the results of the known causes of fires in Portugal, it becomes very clear
that it is crucial to educate people to end risky behaviors, such as the burning of agroforestry leftovers
that causes 27% of fires in Portugal each year. The valorization of the existing energy potential in the
lignocellulosic biomass of agroforestry residues favors the reduction of the probability of rural fires,
this being the focus of the project BioAgroFloRes—Sustainable Supply Chain Model for Residual
Agroforestry Biomass supported in a Web Platform—introduced and explained hereinfo:eu-repo/semantics/publishedVersio
New records of Monstrilloida Sars, 1901 (Crustacea: Copepoda) from Rio Grande do Norte (northeastern coast of Brazil)
Effects of Enteral Fluid Therapy in Continuous Flow Administered by Nasogastric Tube in Buffalo Calves
To investigate the employment of enteral fluid therapy in continuous flow administered by a nasogastric tube in buffalo calves; toassesstheeffectsof a hypotonic and an isotonic electrolyte solutionon: vital functions, blood count and serum andurinary biochemistry profile of buffalo calves. Seven buffalo calves, clinically healthy, were submitted to two treatments. The solutions were administered in continuous flow through a nasogastric tube at a dose of 15 mL/kg/hr for 12 hours. The serum biochemistry profile showed an increase in chloride concentration, decrease in serumurea and osmolarity. In urine, anincrease in sodium and chloride concentrations and a decrease in calcium, creatinine and urea were observed. Enteral fluid therapy in continuous flow proved to beeasy to use and effective in maintaining volemia and concentration of electrolytes in buffalo calves
Evidence for muon neutrino oscillation in an accelerator-based experiment
We present results for muon neutrino oscillation in the KEK to Kamioka (K2K)
long-baseline neutrino oscillation experiment. K2K uses an accelerator-produced
muon neutrino beam with a mean energy of 1.3 GeV directed at the
Super-Kamiokande detector. We observed the energy dependent disappearance of
muon neutrino, which we presume have oscillated to tau neutrino. The
probability that we would observe these results if there is no neutrino
oscillation is 0.0050% (4.0 sigma).Comment: 5 pages, 4 figure
Bacterial microbiota present in the gallbladder of cattle and antimicrobial resistance of Staphylococcus isolates
Avaliação dos atributos físicos de um Nitossolo Vermelho distroférrico sob sistema plantio direto, preparo convencional e mata nativa
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