Mit einem my.chemie.de-Account haben Sie immer alles im Überblick - und können sich Ihre eigene Website und Ihren individuellen Newsletter konfigurieren.
[Report] Adaptive synergy between catechol and lysine promotes wet adhesion by surface salt displacement
In physiological fluids and seawater, adhesion of synthetic polymers to solid surfaces is severely limited by high salt, pH, and hydration, yet these conditions have not deterred the evolution of effective adhesion by mussels. Mussel foot proteins provide insights about adhesive adaptations: Notably, the abundance and proximity of catecholic Dopa (3,4-dihydroxyphenylalanine) and lysine residues hint at a synergistic interplay in adhesion. Certain siderophores—bacterial iron chelators—consist of paired catechol and lysine functionalities, thereby providing a convenient experimental platform to explore molecular synergies in bioadhesion. These siderophores and synthetic analogs exhibit robust adhesion energies (Ead ≥−15 millijoules per square meter) to mica in saline pH 3.5 to 7.5 and resist oxidation. The adjacent catechol-lysine placement provides a “one-two punch,” whereby lysine evicts hydrated cations from the mineral surface, allowing catechol binding to underlying oxides.
Authors: Greg P. Maier, Michael V. Rapp, J. Herbert Waite, Jacob N. Israelachvili, Alison Butler
Autoren:
Greg P. Maier; Michael V. Rapp; J. Herbert Waite; Jacob N. Israelachvili; Alison Butler
On 10 July, researchers in Chile will unveil an online public random number service. Later in July, the U.S. National Institute of Standards and Technology (NIST) will launch its Randomness Beacon as a permanent service, upgrading a pilot program that began in 2013. Brazil, too, is planning ... mehr
The Convention on Biological Diversity (CBD) commits its 196 nation parties to conserve biological diversity, use its components sustainably, and share fairly and equitably the benefits from the utilization of genetic resources. The last of these objectives was further codified in the Conve ... mehr
Solar windows turn some of the light shining through into electricity. They've been on the market for years. But many of these windows absorb some visible light, leaving them with a reddish or brownish hue, a trait frowned on by architects. Now, new versions are on the way that absorb invis ... mehr
(dpa) Das Top-Wissenschaftsereignis 2017 fand schon vor 130 Millionen Jahren statt: Die im Sommer von Tausenden Astrophysikern beobachtete Verschmelzung zweier Neutronensterne am Rande einer fernen Galaxie kürte das US-Journal «Science» zum Durchbruch des Jahres. Aber auch biomedizinische F ... mehr
(dpa) Embryonen im Labor, Zika-Impfstoffe und die Suche nach einem neunten Planeten in unserem Sonnensystem haben nach Einschätzung des US-Fachjournals «Science» das Zeug zum Wissenschaftsaufreger 2017. Um was geht es dabei genau?
Embryonen in Nährlösung
Mit ihrem Experiment, menschliche Em ... mehr
(dpa) Das Fachmagazin Science hat die zehn wichtigsten wissenschaftlichen Durchbrüche des ausklingenden Jahres gekürt.
Ein Überblick:
Im Februar gab das US-Observatorium Ligo die Entdeckung von Gravitationswellen von zwei verschmelzenden Schwarzen Löchern bekannt. Bereits vor einem Jahrhu ... mehr