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MURCHISON. "At the same time, L-excesses of alanine were again found in Murchison but now with enrichment in the isotope 15N, however, the isotopic pairing was later contested on analytical grounds." https://lnkd.in/e6T2vir View in LinkedIn

ALARM SIGNALS IN PLANTS. "Tissue injury inflicted by plant-eating organisms does not go unnoticed; strong selection pressure imposed by biotic stress has fueled the evolution of innovative mechanisms by which plants perceive and respond to tissue damage. Plant hormones occupy a central role in regulating these highly dynamic adaptive responses." https://lnkd.in/eKj_2Vj View in LinkedIn

MURCHISON. "In 1997, L-excesses were also found in a non-protein amino acid, isovaline, suggesting an extraterrestrial source for molecular asymmetry in the Solar System." https://lnkd.in/e6T2vir View in LinkedIn

SHARED MOLECULAR STRATEGIES. "In both plants and animals, oxylipins derived from membrane lipids are sentinels of wound stress. The biochemical logic underlying oxylipin synthesis in plants and animals is remarkably similar." The structural diversity of oxylipins (including the jasmonates) affords functional specificity and high turnover affords an acute signal. https://lnkd.in/eKj_2Vj View in LinkedIn

MURCHISON METEORITE. L-alanine was also later found in living creatures leading to terrestrial contamination accusations. https://lnkd.in/e6T2vir View in LinkedIn

LANDMARK PAPER. "Leaf damage induces systemic accumulation of proteinase inhibitors that impair insect digestive enzymes. This landmark paper introduced the idea that mobile signals generated at the site of injury orchestrate systemic protection against insect herbivores...a cornerstone of current theories of plant immunity." (1972). https://lnkd.in/eKj_2Vj View in LinkedIn

MURCHISON METEORITE. "The initial report stated that the amino acids were racemic and therefore formed in an abiotic manner because amino acids of terrestrial proteins are all of the L-configuration." https://lnkd.in/e6T2vir View in LinkedIn

STATIONARY BUT FAR FROM PASSIVE. "As sessile organisms, plants have to adapt their physiological and morphological properties to the fluctuating environment. Plants perceive exogenous and endogenous stimuli, decode them, and alter their gene expression patterns via various plant hormonal signal transduction pathways." https://lnkd.in/ek3ckMU View in LinkedIn

D-AMINO ACIDS IN METEORITES. "Serine and threonine, usually considered to be earthly contaminants, were conspicuously absent in the samples...diamino acids was identified in the Murchison meteorite." https://lnkd.in/e6T2vir View in LinkedIn

FRAGMENT IN NATURE continues from last weekend about the ability of plants to smell, and defend themselves. What exact signals from the environment the plants pick up, how nuanced those signals are, and how the plants react to those signals, is a topic that has gained considerable knowledge in recent decades, in partly thanks to molecular biology and genetic techniques. View in LinkedIn