Results 21 to 30 of about 136,179 (257)

Photosynthesis and early Earth [PDF]

Current Biology, 2015
Life has been built on the evolution and innovation of microbial metabolisms. Even with our scant understanding of the full diversity of microbial life, it is clear that microbes have become integral components of the biogeochemical cycles that drive our planet.
openaire   +2 more sources

A comparison of the spatial heterogeneities of surface fluxes simulated by INLAND model with observations at a valley and a nearby plateau stations in Central Amazon Forest

SN Applied Sciences, 2022
Article Highlights This manuscript draws attention to the spatial heterogeneity in Amazon forest mosaic and its effects on the ecosystem exchanges; The inclusion of a lumped unconfined aquifer model is essential to simulate properly the water balance in ...
Elisângela Broedel, Celso von Randow, Luz Adriana Cuartas, Prakki Satyamurty, Alessandro Carioca de Araújo, Luiz Antônio Cândido, Javier Tomasella, Antônio Donato Nobre, Etienne Tourigny   +8 more
doaj   +1 more source

The Early Devonian (Emsian) acrotretid microbrachiopod Opsiconidion minor Popov, 1981, from the Alaska/Yukon Territory border and Novaya Zemlya [PDF]

Estonian Journal of Earth Sciences, 2020
New records of the poorly known acrotretid (Biernatidae) microbrachiopod Opsiconidion minor Popov are described from middle Emsian strata of the Ogilvie Formation in east-central Alaska and the adjacent Yukon Territory, Canada, and compared with new ...
Lars E. Holmer, Robert B. Blodgett, Yue Liang, Zhifei Zhang   +3 more
doaj   +1 more source

Camenellan tommotiids from the Cambrian Series 2 of East Antarctica: Biostratigraphy, palaeobiogeography, and systematics [PDF]

Acta Palaeontologica Polonica, 2021
Cambrian Series 2 shelly fossils from thick carbonate successions in East Antarctica have received limited systematic treatment through the 20th century.
Thomas M. Claybourn, Christian B. Skovsted, Marissa J. Betts, Lars E. Holmer, Lucy Bassett-Butt, Glenn A. Brock   +5 more
doaj   +1 more source

Alkylation of Complex Glycine Precursor (CGP) as a Prebiotic Route to 20 Proteinogenic Amino Acids Synthesis

Molecules
It is not known why the number of proteinogenic amino acids is limited to 20. Since Miller’s experiment, many studies have shown that amino acids could have been generated under prebiotic conditions.
Chiaki Kuroda, Kensei Kobayashi
doaj   +1 more source

Reassessing late-stage impact assumptions in light of modern planet formation paradigms

Frontiers in Astronomy and Space Sciences
In this Perspective, we examine the implications of modern cold-accretion and disk-mediated paradigms for two widely cited impact hypotheses: the Moon-forming giant impact and the Late Heavy Bombardment, with attention to consequences for planetary ...
Brian Turner
doaj   +1 more source

The early Earth [PDF]

Nature, 1993
Proterozoic Crustal Evolution. Edited byK. C. Condie Elsevier: 1993. Pp. 537. DFL280, $175.
openaire   +1 more source

Climate variability off Africa's southern Cape over the past 260 000 years [PDF]

Climate of the Past
During the late Quaternary, the climatic conditions in southern South Africa experienced significant fluctuations, notably in temperatures and precipitation.
K. Purcell, K. Purcell, K. Purcell, M. H. Simon, M. H. Simon, M. H. Simon, E. J. Pryor, E. J. Pryor, S. J. Armitage, S. J. Armitage, H. J. L. van der Lubbe, E. Jansen, E. Jansen, E. Jansen   +13 more
doaj   +1 more source

Consensus Standards and Recommendations for Developmental and Cognitive Surveillance, Screening, and Evaluation in Sickle Cell Disease: Executive Summary From the National Alliance of Sickle Cell Centers Neurocognitive Workgroup

Pediatric Blood &Cancer, EarlyView.
ABSTRACT Neurodevelopmental and neurocognitive difficulties are prevalent among individuals with sickle cell disease and warrant prompt identification and support. This Special Report provides an executive summary of standards and recommendations for surveillance, screening, and evaluation for development and cognition across the lifespan developed by ...
Alyssa M. Schlenz, Donna Murdaugh, Andrew M. Heitzer, Jennifer N. Longoria, Wendy Santos‐Modesitt, Arianna Martin, Judy Cavazos, Jeff Schatz, Catherine R. Hoyt, Alison King, Eboni I. Lance, Steven Hardy, Marsha Treadwell   +12 more
wiley   +1 more source

Phase Angle as an Early Functional Biomarker of Cancer‐Related Fatigue in Pediatric Oncology: A Prospective Longitudinal Study

Pediatric Blood &Cancer, EarlyView.
ABSTRACT Background Pediatric cancer remains a leading cause of morbidity and mortality worldwide, particularly in low‐and middle‐income countries. Cancer treatment may impair nutritional status, alter body composition, and exacerbate cancer‐related fatigue (CRF).
Luís Carlos Lopes‐Junior, Luiz Claudio Barreto Silva Neto, Fabiano Kenji Haraguchi, Letícia Batista de Azevedo, Marcelo Brenner Nascimento Carlini, Raphael Manhães Pessanha, Mariana Rabello Laignier, Wesley Rocha Grippa, Tania Mara Lopes Bitti Bortolini, Gláucia Zouain‐Figueiredo, Regina Aparecida Garcia de Lima, Liliana Vasquez   +11 more
wiley   +1 more source