Study of non-linear viscoelastic behavior of the human red blood cell

The non-linear behavior of human erythrocytes subjected to shear stress was analyzed using data series from the Erythrocyte Rheometer and a theoretical model was developed. Linear behavior was eliminated by means of a slot filter and a sixth order Savisky-Golay filter was applied to the resulting time series that allows the elimination of any possible white noise in the data. A fast Fourier transform was performed on the processed data, which resulted in a series of frequency dominant peaks. Results suggest the presence of a non-linear quadratic term in the Kelvin-Voigt phenomenological model. The correlation dimension studied through recurrence quantification analysis gave C2=2.58. Results suggest that the underlying dynamics is the same in each RBC sample corresponding to healthy donors

Envisioning sea level rise in Golden Gate National Recreation Area

A step-by-step explanation of how Golden Gate National Recreation Area developed a set of complementary climate change exhibits for various sites in the park, focused on the impacts of sea level rise

ORGANIC POULTRY PRODUCTION SYSTEM AND MEAT CHARACTERISTICS

The effect of the organic poultry production system on some qualitative characteristics of the meat is reported. The effect is mainly due to the greater age and physical activity of animals but it is largely modulated by the farming protocols used e.i., genetic strain (fast and slow-growing strains) and pasture availability. Due to economic reasons and chicks availability, generally fast or intermediate growing chicks are used. Such animals are not adapted to the organic system and health and welfare problems caused by leg disorders and lameness are recurrent. Nevertheless, compared to conventional chickens, the carcasses have higher breast and drumstick percentages and a lower level of abdominal fat. Even the physical-chemical characteristics of the meat are affected: muscles have lower final pH and water holding capacity. Instead cooking loss, lightness, shear values, Fe, and polyunsaturated fatty acids increase. Unfortunately, the greater physical activity increases the oxidative metabolism of the body and determines a higher level of TBA-RS. Slow-growing strains, probably due to their particular behaviour (more kinetic activity, foraging) and metabolism, show larger differences in qualitative traits, compared to both conventional and organic fast-growing strains. In particular, with respect to fast-growing strains, they have a higher antioxidant level (715 vs 522 nmol HClO mL-1), serum a-tocopherol (19.0 vs 17.2 mg L-1) and grass ingestion. As a result, the oxidative stability of fresh and stored meat is much higher than fast-growing strains (2.0 vs 3.05 mg MDA kg-1).In conclusion, the organic poultry production system seems to be an interesting alternative method especially if suitable farming protocols will be developed and used

FUNCTIONAL FOODS IN THE EUROPEAN UNION: AN OVERVIEW OF THE SECTOR'S MAIN ISSUES

In Europe the demand of functional foods varies remarkably from country to country, on the basis of the alimentary traditions, the enforced legislation and the different cultural heritage that people have acquired. The opportunities of expansion on the market seem to be quite favorable and the interest of the consumers is rather high. But the diffusion of these products in the community area is slowed down by some obstacles. One of main ones is the lack of an official law-recognized definition for these references, necessary in order to clearly assign these products to the food sector rather than to the pharmaceutical one. In a such situation, we note that nowadays it is impossible to carry out a complete survey of this world, due to the lack of homogeneous and trustworthy statistical data and to the confused definition of the sector. In fact, every country adopts his own national legislation and includes in this class different products. The variable meaning assumed by the term “functional food” in the EU member states, can also hinder the free trade even within the EU boundaries. In fact, pursuing the safeguard of human health, each partner can block the admission of a product, even if it comes from an other EU member country. This lack of clarity at the production phase is reflected in a difficult control at the consumption phase. The disinformation of the trade operators and, consequently, of the consumers can involve some risks for these last ones due to not only to the deficiency of benefits, using functional foods, but also possible damages to the health. Ambiguous definition and gaps of knowledge about the composition and the effects of these products, in fact, can interfere with an aware choice of purchase and an organized development of the sector.