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[en] Hot water extract of sugar and red maple bark was addedto maple syrup and dried byfreeze (FD) and vacuum drum drying(VD) techniques. Addition of maple bark extracts to syrup helped to develop polyphenols-enriched maple sugar. X-ray diffraction revealed that sugar obtained from FD was amorphous in nature, while crystalline when dried by VD. Furthermore, the observation of maple sugar samples under scanning electron microscopy showed smooth and porous surface for FD sugar, while rough and grainy surface for VD sugar. Hausner ratio indicated that sugar produced by VD showed better flow characteristics than FD sugar. (Author)
[en] Although crystalline cane and beet sucrose are > 99.8% pure, they exhibit different thermal behavior. In general, the cane sucrose DSC curve contains a small endothermic peak before the main endothermic peak, which is not present in the beet DSC curve, leading to a lower onset temperature for thermal decomposition in cane. To compare their thermal behavior, the thermal decomposition kinetic parameters for analytical and commercial cane sucrose and commercial beet sucrose were determined. Beet sucrose had a higher activation energy than either cane source, indicating that thermal decomposition is inhibited in beet sucrose. However, the k values from isothermal experiments at a single temperature did not match the nonisothermally predicted k values, suggesting that, while useful for comparison, the nonisothermal kinetic parameters cannot be used to predict the behavior of sucrose thermal decomposition under isothermal conditions.
[en] Highlights: • A new process for metal-ion interactions on surfaces. • A new process for enhancing interactions with sugars. • A new process for using flakes for catalysis. • A new process for using flakes for sugar interactions. • A new process for formation of sugars on metal induced surfaces. The present theoretical study proposes the enhanced interaction of nanostructures with monosaccharides. It has been demonstrated that the interactions with and without metal adsorption do in fact show that the adsorption energies change accordingly. It is important to note that the chemistry of reactions can also be influenced as a result of this change in dynamics.
[en] The wide use of portable electronics urgently requires better batteries featuring high energy density, good safety, and biodegradability. Although sugar-powered enzymatic fuel cells (EFCs) could be next-generation, environmentally friendly, micropower sources, they suffer from incomplete oxidation of the sugar fuels and an inability to utilize mixed sugars, which causes the low efficiency of fuel utilization and limits the choice of fuels. In this study, we designed an in vitro 15-enzyme pathway that can co-utilize sucrose, glucose, and fructose in the anodic compartment of EFCs. The EFCs achieved Faraday efficiencies of approximately 95% for these three sugars, suggesting that the fuels were completely oxidized, and yielded a maximum power density of 0.80–1.08 mW cm−2. In addition, EFCs based on this versatile enzymatic pathway were capable of running on mixed sugars, such as commercial soft drinks. These results offer a possible solution for the extraction of the maximum energy stored in mixed sugar fuels and the achievement of high energy densities for EFCs; these EFCs offer good substrate flexibility and commercial potential.
[en] The specifications of a dosimeter, using sugar as material are presented. This dosimeter will be used to measure radiation dose in contaminated persons. (E.G.)
[pt]Apresentam-se as especificacoes de um dosimetro, que usa como material o acucar, para medir a dose absorvida pelo pessoal contaminado em acidente nuclear. (E.G.)
[en] The tragic consequences of vitamin A deficiency (blindness, illness, and premature death) have stimulated extensive efforts to prevent this deficiency. Perhaps most notable in scope and influence is the WHO’s recommendation since 1998 that high-potency supplements should be given every 4–6 months to children 6 to 59 months old who live in the affected regions of the world. The WHO estimates that 1.25 million deaths in 40 countries have been averted by this programme. Many of these countries have also addressed the problem by fortifying commonly consumed foods, such as cooking oil or sugar. Agricultural programmes have developed both biofortified and genetically modified foods with increased vitamin A content
[en] The regulatory sequence of sucrose synthase (susy) was explored in HTGS and screened using various bioinformatics tools for promoter prediction and identification of functional regulatory motifs. Transcription start site (TSS) was predicted in the promoter sequence. Species specific motifs were identified by using Plant PAN database. The Plant Care predicted various light responsive, hormone inducible and tissue specific motifs in the full length promoter which may be essential for the constitutive expression governed by this promoter. Full length susy promoter isolated from tomato (Solanum lycopersicum) drove maximum transient expression of GUS gene in various tissues of tobacco, cotton and peas. The susy promoter identified and analyzed in this study is suitable for transgene expression in economically important agricultural crops, especially to avoid strong over-expression. (author)
[en] Full text: Introduction: As under developing countries, Morocco is also a victim of the nutritional transition characterized by a food imbalance that is based on high sugar consumption (95g/p/d) directly involved in triggering serious health problems. Action plans are then necessary to conduct at the national level as part of the prevention of various diseases. Therefore, the purpose of this study is to define the threshold of perception of sweet taste “sucrose” among the Moroccan population and to evaluate differences according to sex and age groups. Methods: This cross-sectional and simple-blind experimental study was conducted among 199 subjects aged from 15 years and over. For each subject, anthropometric characteristics were measured. Sucrose threshold perception was determinate based on the validated 3-AFC test method for 9 prepared solutions (1000ml) of sucrose at different concentrations ranging from 0 to 243 mmol / l. Results: The results show that 91.96% of the studied population perceives sweetness at a high threshold of 27 mmol / l. A high sweet sensitivity were observed in women (124), but no significant difference (P> 0.05), according to sex, was found for perception of sweet taste at all concentrations. Concerning BMI status, the major part of our study population was restricted in normal status for all concentrations and no significant difference was noted. Conclusion: The present study showed that Moroccan population is in risk of different diseases linked to its high sweet perception threshold. Therefore, it is strongly recommended to reduce sugar consumption in order to combat non-communicable disrders, who have become the leading cause of death in the world. (author)
[en] We present a framework in which biomolecular conformational flexibility can be envisaged in a systematic way through a 'Static Mode' approach. Preliminary results concern the constraints that could impact a DNA grafted to a silicon substrate through a thiol termination. We show that the DNA backbone (particularly the sugar) exhibits the majority of the induced deformation, leaving the base stacking unchanged. The alkyl chain separating the thiol termination from the DNA strand appears rigid and do not participate to the overall molecular flexibility.
[en] The proper axial rotation and right-handed helical orbital rotation of Earth are the simplest and persistent factors of chiral influence on the Earth. These types of motion are treated as basic to the selection of L-amino acids and D-sugars (homochirality) as 'building blocks' for constructing right-handed helical biomacromolecules. The role of agent for transfer of chiral influence of the factors mentioned above on the molecular level can be played by tides and wind waves. The rise and fall of the waves leads to formation of mainly right-handed helical water associates that favour the formation of right-handed helical biomolecules. Biological indications of the existence of such water associates are discussed. The bibliography includes 175 references