Day wounds heal faster than night wounds. Free Technical Library News

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Day wounds heal faster than night wounds.

28.11.2017

Scientists from the Laboratory of Molecular Biology of the Council for Medical Research in Cambridge (UK) found a significant difference in the speed of healing of wounds inflicted at different times of the day. It turned out that the reason is in circadian rhythms, which manifest themselves at the cellular level.

The circadian rhythm is a complex mechanism that adjusts the rhythms of our existence - sleep patterns, nutrition, etc. - to a 24-hour daily cycle. This applies not only to the body as a whole, but also to its individual parts: organs, tissues and cells.

In this case, the focus of scientists was fibroblasts - cells of the connective tissue of the body, synthesizing the extracellular matrix, the "skeleton" of other tissues. These cells migrate into the wound at the first stage of healing and play a crucial role in this process.

Scientists have found that the proteins responsible for the formation of the internal skeleton in cells circulate more actively during the daytime. The same proteins “inform” fibroblasts that they need to rush to the site of tissue damage. Experiments with tissue cultures in Petri dishes have shown that fibroblasts are more "agile" during the day than at night.

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The data obtained allow scientists to assert that there is an atmosphere on Pluto, and it is subject to periodic seasonal fluctuations in density and composition. When Pluto gets as close as possible to the Sun, solid nitrogen and methane from its surface turn into a gaseous state and make the atmosphere denser.

The last time Pluto passed its perihelion (the point in its orbit closest to the Sun) was in 1989. In 2015, during the "visit" of New Horizons, it was still summer on Pluto (a year there lasts 248 Earth years), and the summer atmosphere consisted mainly of nitrogen, methane and carbon dioxide.

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Either there are always a lot of grains of solid matter in the atmosphere of Pluto and the sunlight reaching them excites the atoms of this matter and causes them to emit X-ray quanta, or the density of the solar wind matter in the region of Pluto is higher than calculated. Perhaps some hitherto unknown phenomenon is focusing the solar wind on Pluto - hence the high density of particles and X-rays, astronomers say. There is no exact answer to the question about the source of strong X-ray radiation on Pluto yet.

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