Month: September 2022

DEFENSE PRIMING."To compensate for this vulnerability, some plants appear to prime specific defenses in response to environmental cues that reliably indicate an increased probability of attack before they actually experience an herbivore or pathogen." https://lnkd.in/eabgX9e View in LinkedIn

CUT GRASS SMELL. "The sweet smell of new mown grass is in fact an alarm signal from the wounded leaf cells that switches on the grass defence system. The 'green grass smell' is predominantly one aldehyde (trans-2-hexanal) with two other aldehydes and alcohols adding subtler notes." Memories of a boy stuck in Latin class. https://lnkd.in/e7UQ_sh View in LinkedIn

NEW MATERIALS AND INVISIBILITY. Metamaterials have been developed with unique properties, including negative refractive indexes. This seemingly innocent finding has led to the development of cloaking technology (invisibility), and subsequently, to the jaw-dropping concept of cloaking time to hide events. While both are very new developments, and at very early stages, the implications are significant, to say the least. View in LinkedIn

"METAMATERIALS are materials engineered to have properties that have not yet been found in nature. They are made from assemblies of multiple elements fashioned from conventional materials such as metals or plastics. The materials are usually arranged in repeating patterns, often at microscopic or smaller scales that are smaller than the wavelengths of the phenomena they influence." https://lnkd.in/eMWCxE4 View in LinkedIn

DESIGNED STRUCTURES. "Metamaterials derive their properties not from the properties of the base materials, but from their designed structure. Their precise shape, geometry, size, orientation and arrangement gives them their properties." https://lnkd.in/eMWCxE4 View in LinkedIn

UNNATURAL SELECTION. "By controlling a material's nanostructure, researchers have been able to produce materials with properties unknown or almost impossible to achieve in nature. Those structures can interact with light and electromagnetic waves in unusual ways. Recently, metamaterials have shown unusual physical behaviors as well." https://lnkd.in/eBD2wFN View in LinkedIn

NATURE'S FECUNDITY. "I think it's a mistake to define metamaterials in terms of properties not found in nature, simply because it's really hard to create things that don't exist in nature." https://lnkd.in/eBD2wFN View in LinkedIn

MATCHING SIZES. "The "meta" part emerges when we get into the nanoscale realm. This is when the dimensions within the structure approach the dimensions of whatever energy is exciting it." https://lnkd.in/eBD2wFN View in LinkedIn

SIZE OF THE GLUE. "In photonic metamaterials, for example, the structures are comparable in size to the wavelengths of light they interact with. In my mechanical metamaterials, the repeating structures approach the scales of the links that hold the materials together." https://lnkd.in/eBD2wFN View in LinkedIn

ONLY NINE YEARS OLD. "The first metamaterials were built in 2006 by a team that included John Pendry at Imperial College London and David Smith at Duke University in North Carolina. Pendry, Smith and colleagues created artificial materials with negative indices of refraction – properties that do not normally occur in natural materials." https://lnkd.in/e_Auavs View in LinkedIn