Celso R. de Oliveira

Structure revision of scytonemin imine and its relationship to scytonemin chromism and cyanobacterial adaptability

G. Larson, Tanzil Mahmud, Ilya D. Dergachev, Casey S. Philbin et autres

Scytonemin, a UV-protective pigment produced by cyanobacteria, is essential for microbial survival under extreme solar radiation. Recent studies suggest its structural analog, scytonemin imine, may serve as a biosynthetic marker for cyanobacteria exposed to intense light. Here, we present a structural revision, …

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Water, not carbon, drives drought‐constraints on stem terpene defense against simulated bark beetle attack in Pinus edulis

Shealyn C. Malone, R. Alex Thompson, Pak S. Chow, Celso R. de Oliveira et autres

Drought predisposes forest trees to bark beetle-induced mortality, but the physiological mechanisms remain unclear. While drought-induced water and carbon limitations have been implicated in defensive failure and tree susceptibility, evidence demonstrating how these factors interact is scarce. We withheld water from mature, …

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Isolation of new neolignans and an unusual meroterpenoid from Piper cabagranum

Celso R. de Oliveira, Zachary D. Ledvina, Michael D. Leonard, Samuel O. Odoh et autres

A novel meroterpenoid cabagranin D was isolated with related neolignans cabagranins A–C from the leaves of Piper cabagranum (Costa Rica). Cabagranins A–C represent the first examples of 3,3′-neolignans isolated from the plant genus Piper , and the meroterpenoid cabagranin D displays an …

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Flutuações de intensidade no espectro SERS de 'CU''PC'TS sobre filme de 'AG': sondando flutuações de morfologia da superfície?

Dalva Lúcia Araújo de Faria, Celso R. de Oliveira