Results 61 to 70 of about 18,323 (221)

Small understory trees increase growth following sustained drought in the Amazon

New Phytologist, Volume 249, Issue 6, Page 2787-2799, March 2026.
Summary Droughts pose a major threat to the Amazon rainforest, yet the mechanisms enabling trees to maintain growth under prolonged drought remain poorly understood, particularly in the understory layer. We leveraged a 22‐yr Throughfall Exclusion (TFE) in a 1‐ha plot in eastern Amazonia, paired with a Control plot, to test whether small understory ...
Mateus C. Silva, David C. Bartholomew, André L. Giles, Paulo R. L. Bittencourt, Pablo Sanchez‐Martinez, Lion R. Martius, Vanessa N. Rodrigues, Rachel Selman, João P. Reis, Grazielle S. Teodoro, Rafael S. Oliveira, Oliver Binks, Maurizio Mencuccini, João A. Silva Junior, Antonio C. L. da Costa, Patrick Meir, Lucy Rowland   +16 more
wiley   +1 more source

Bound state properties and photodetachment of the negatively charged hydrogen ions

, 2015
Absorption of infrared and visible radiation from stellar emission spectra by the negatively charged hydrogen ions H$^{-}$ is considered. The explicit formula for the photodetachment cross-section of the negatively charged hydrogen ion(s) is derived ...
Frolov, Alexei M.
core   +1 more source

Strukturrevision des C16‐Sesquiterpens Hegelenether und der Mechanismus der C6‐Methylierung in der Terpenbiosynthese

Angewandte Chemie, Volume 138, Issue 9, 23 February 2026.
Die Struktur des nicht‐kanonischen C16‐Sesquiterpens Hegelenether wurde zur Struktur von Marxdiol revidiert und seine absolute Konfiguration bestimmt. Isotopenmarkierungsexperimente klärten den stereochemischen Verlauf der an seiner Biosynthese beteiligten Methyltransferase auf.
Heng Li, Gregor Schnakenburg, Michael Groll, Jeroen S. Dickschat   +3 more
wiley   +1 more source

The Dual Origin of the Terrestrial Atmosphere

, 2003
The origin of the terrestrial atmosphere is one of the most puzzling enigmas in the planetary sciences. It is suggested here that two sources contributed to its formation, fractionated nebular gases and accreted cometary volatiles.
Abe, Anders, Ballentine, Balsiger, Bar-Nun, Bar-Nun, Benz, Bockelée-Morvan, Burnard, Busemann, Caffee, Chen, Chyba, Chyba, Dauphas, Dauphas, Dauphas, Dauphas, Dauphas, Dauphas, Delsemme, Delsemme, Eberhardt, Holland, Honda, Honda, Hunten, Hunten, Ihaka, Iro, Jagoutz, Kerridge, Kimura, Kleine, Kunz, Laufer, Marty, Marty, Marty, Maréchal, Mathew, Mathew, Matsui, Matsumoto, Mazor, Meier, Meisel, Meisel, Morbidelli, Moreira, Moreira, Nicolas Dauphas, Notesco, Notesco, Owen, Owen, Owen, Owen, Ozima, Ozima, Ozima, Pepin, Pepin, Pepin, Pepin, Pepin, Pepin, Podosek, Porcelli, Porcelli, Press, Sagan, Sarda, Sasaki, Schoenberg, Shoemaker, Swindle, Swindle, Tolstikhin, Trieloff, Walker, Wieler, Wieler, Yamamoto, Yin, Yokochi, Zahnle, Zahnle, Zahnle, Zahnle, Zahnle, Zhang   +91 more
core   +1 more source

The role of tunneling in enzyme catalysis of C–H activation [PDF]

, 2006
Recent data from studies of enzyme catalyzed hydrogen transfer reactions implicate a new theoretical context in which to understand C–H activation. This is much closer to the Marcus theory of electron transfer, in that environmental factors influence the
Abbink, Floor C. H., Biemond, Bart J., Bierings, Marc, Klaassen, Irene L. M., Lauw, Mandy N., Middeldorp, Saskia, Pieters, Rob, te Loo, D. Maroeska M. W., Tissing, Wim J. E., van de Wetering, Marianne D., van der Sluis, Inge M., van Ommen, C. Heleen, Zwaan, C. Michel   +12 more
core   +4 more sources

Uso das técnicas por diafanização e modelagem matemática em 3D como métodos de contribuição e identificação foliar de Protium ovatum Engl.

, 2020
F.E.V.S Nervação Protium ovatum Diafanização foliar Análise foliar O trabalho teve por objetivo o uso das técnicas por diafanização e modelagem matemática em 3D como métodos de contribuição e identificação foliar de Protium ovatum Engl.
A. P. Filho
semanticscholar   +1 more source

Direct experimental measurement of the solubility of hydrogen isotopes in the Eurofer-97 RAFM

Nuclear Materials and Energy
Accurate knowledge of hydrogen isotopes transport properties in structural materials of interest for Breeding Blankets (BB) and Tritium Extraction and Recovery (TER) systems is fundamental for experiments, modelling, safety and design activities.
Igor Peñalva, María Urrestizala, Natalia Alegría, Marcelo Roldán, Marta Malo   +4 more
doaj   +1 more source

Phytosociological importance of an ombrophilous forest fragment in the State of Roraima, Brazil = Importância fitossociológica de um fragmento de floresta ombrófila densa no estado de Roraima, Brasil

Agro@mbiente On-line, 2016
The aim of this study was to characterise the phytosociology of a fragment of native forest in the town of Caroebe, in the State of Roraima, Brazil. All trees with a DBH ≥ 15 cm were inventoried in 18 permanent plots of 15 x 20 m (300 m²). There were 175
Luiz Fernandes Silva Dionisio, Osmar Serra Bonfim Filho, Bruno Roberto de Souza Crivelli, Jefferson Peixoto Gomes, Marcelo Henrique Silva de Oliveira, João Olegário Pereira de Carvalho   +5 more
doaj   +1 more source

α, β-Amyrin, a pentacyclic triterpenoid from Protium heptaphyllum suppresses adipocyte differentiation accompanied by down regulation of PPARγ and C/EBPα in 3T3-L1 cells.

Biomedicine & pharmacotherapy = Biomedecine & pharmacotherapie, 2019
Previous studies have reported the anti-obesity effects of α, β-Amyrin in high fat-fed mice. This study aimed to evaluate whether α, β-Amyrin has an anti-adipogenic effect in 3T3-L1 murine adipocytes and to explore the possible underlying mechanisms. 3T3-
Karina Moura de Melo, F. D. de Oliveira, Rose Anny Costa Silva, Ana Luíza Gomes Quinderé, J. M. Marinho Filho, A. J. Araújo, Eanes Delgado Barros Pereira, A. Carvalho, M. Chaves, V. Rao, F. Santos   +10 more
semanticscholar   +1 more source

Chemical and Biological Properties of Hymenaea courbaril L.: A Review

Chemistry &Biodiversity, Volume 23, Issue 2, February 2026.
PRISMA‐style flowchart showing the screening process of studies identified and selected in the review has been added to the attachments. ABSTRACT Hymenaea courbaril L., commonly known as jatobá, is a plant traditionally used by native populations for medicinal purposes, in addition to providing edible fruits and durable wood for construction.
Cicera Alane Coelho Gonçalves, Geane Gabriele de Oliveira Souza, Ana Maria Fernandes Duarte, Joice Barbosa do Nascimento, Fázia Fernandes Galvão Rodrigues, José Galberto Martins da Costa, Fabíola Fernandes Galvão Rodrigues   +6 more
wiley   +1 more source