Bac­te­ria in equip­ments

Down to Earth - - SCIENCE -

EARTH'S MOON is dif­fer­ent from other moons. It is big­ger and the com­po­si­tion is the same as that of the planet. So far, it was be­lieved that the rea­son for this was that both the earth and the moon were formed to­gether dur­ing the kJUHDW LPSDFWy %XW WKLV WKHRU\ GLG QRW H[SODLQ PDQ\ WKLQJV about the moon, such as the fact that if the moon con­densed from a disk of ma­te­rial ro­tat­ing around earth's equa­tor, it should be in or­bit over the equa­tor. In­stead, the satel­lite's or­bit is tilted five de­grees off the equa­tor.

$ QHZ PRGHO H[SODLQV WKDW D KLJK HQHUJ\ FROOLVLRQ OHIW a mass of va­por­ised and molten ma­te­rial, from which the HDUWK DQG WKH PRRQ IRUPHG %RWK WKH HDUWK DQG WKH PRRQ con­densed from the same ma­te­rial, and there­fore, have a VLPLODU FRPSRVLWLRQ 7KH WKHRU\ VXJJHVWV WKDW WKH DQJXODU mo­men­tum was dis­si­pated. In the course of time, the moon FRQWLQXHG WR PRYH DZD\ IURP WKH HDUWK DQG WKHQ UHDFKHG a sec­ond tran­si­tion point, where the in­cli­na­tion of the moon dropped to about five de­grees, putting it more or less in its cur­rent or­bit.

Na­ture, Oc­to­ber 31

that as­sist pa­tients with heart, liver and other or­gan dis­ease have one im­ped­i­ment—bac­te­ria that form in­fec­tious biofilms on those de­vices not only sab­o­tage their success, but also con­trib­ute to the ram­pant in­crease in an­tibi­otic re­sis­tance. Now re­searchers have cre­ated self-heal­ing slip­pery sur­face coat­ings with med­i­cal-grade te­flon ma­te­ri­als and liq­uids that pre­vent biofilm for­ma­tion on med­i­cal de­vices, while pre­serv­ing nor­mal in­nate im­mune re­sponses against path­o­genic bac­te­ria.

Bio­ma­te­ri­als, Jan­uary 2017

BI­OL­OGY

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