Category: Beauty | Date : October 9, 2015

It’s proven : 75 % of the exposure of the skin to UV occurs only outside the summer period, which is the rare moment when we use a sunscreen, says Claire Byrne, Director of Innovation Boots.

Furthermore, 90% of skin aging is due those rays.

Especially UVA, which penetrates deep dermis where they cause irreversible damage to the skin fibers, guarantee the firmness of the skin.

Present all year, unfiltered by clouds, these rays are even threatening winter gray weather and through the windows !

Use cream with a broad-spectrum protection throughout the year is therefore essential to prevent many skin damage such as dryness, sensitivity, redness, wrinkles, spots, gray complexion.

UV and are not solely responsible for this undermining.

Infrared also amplify all skin damage.

An SPF 15 is sufficient apart from exceptional sunlight conditions.

Shock – arguments in response those who believe that skin under filters every day, constantly overloaded in chemicals, uses less natural protections and loses its ability to defend itself, including against UV.

It also may produce less vitamin D.

This new UV attitude explains the wave of new photo- protective day creams, specially equipped with filters in addition to their action moisturizing, anti-aging or corrective.



Category: Science | Date : October 9, 2015

To treat respiratory problems, predict the course of vascular disease or detect malaria in the blood, doctors are turning to the physicists of the flow of fluids.

Thus begins a wonderful article published in the Journal du CNRS.

Julien Bourdet explains that to understand the overall functioning of the human body, it must not only be able to represent the organs that compose it, but also the fluids that run through the.

That is why specialists in fluid mechanics attempt to model as closely as possible how gases and liquids travel the bloodstream and airways.

With the key, the ability to improve medical diagnostics and tailor treatments.

The first example given is that of screening for risk of atherosclerosis, the disease characterized by the deposition of a plate, consisting essentially of fat, in the inner wall of an artery.

It gradually reduces the diameter of some vessels and may eventually prevent the flow of blood.

The work of physicists has shown that its development is largely due to the mechanical stresses exerted on artery walls.

Downstream of a bifurcation of the blood network, the flow slows down, “explains Gwennou Coupier, the Interdisciplinary Physics Laboratory, Saint-Martin- d’Hères.

Result: certain cells, white blood cells in particular, which are not carried away by the stream there, reach into the artery wall, thereby promoting the growth of a plate, the origin of the disease.

Such information allows physicians to monitor priority – MRI – certain areas in patients risk.

The acute respiratory distress syndrome is another disease where fluid mechanics could be of great help.

This inflammation of the lungs causes the death of over 10,000 people each year in France.

Unfortunately, the surfactant injected to help the lungs to swell more easily – very successfully used in premature babies – does not give good results in adults.

The fundamental difference between the lungs of an infant and those of an adult, it’s their size, “says Marcel Filoche, the Physics Laboratory of Condensed Matter Palaiseau.

The model he developed with his team shows the volume injected to the patient to ensure treatment success.

It also points to other critical parameters taken into account as the injection speed, the density of the liquid, its viscosity, but also the patient’s position in space, gravity aiding the surfactant diffuse into the lungs as a function of angle different pulmonary branch.

Obviously, fluid mechanics has not finished to advance medicine.