Results 51 to 60 of about 1,258 (180)

Standard transition aluminas. Electron microscopy studies

Materials Research, 2000
The aim of this paper is to present the results of characterization of the particle shapes of six standard transition aluminas samples using transmission and scanning electron microscopies; selected area electron diffraction, in parallel with X-ray ...
P. Souza Santos, H. Souza Santos, S.P. Toledo   +2 more
doaj   +1 more source

Calcination of gibbsite

, 1972
Data arc presented showing the changes in physical properties which occur during the calcination of Bayer-process gibbsite at temperatures up to 1400°C. The various stages of the calcination were examined using differential thermal analysis, X-ray diffraction, low-temperature nitrogen adsorption, optical and electron microscopy, and particle-size ...
openaire   +1 more source

The master molecule that built biology: How water shaped the chemistry of life

Protein Science, Volume 35, Issue 5, May 2026.
Abstract The deep entanglement of biomolecular structure and function with aqueous systems supports the view that water actively sculpted both molecules and processes during the origins of life and continues to constrain evolution today. Nature's rules of biochemistry and biophysics have survived for nearly 4 billion years.
Juliana DiGiacomo, George D. Rose, Loren Dean Williams   +2 more
wiley   +1 more source

Lateritic Contribution to Enhancing the Grade of Iron Ore from Serra Leste Deposit in Carajás Mineral Province, Brazil

Mining
The Carajás Province, located in the southeastern Amazon, hosts some of the world’s largest high-grade iron deposits. Despite their economic importance, the processes linking lateritic weathering and iron enrichment remain incompletely understood.
Rayara do Socorro Souza da Silva, Marcondes Lima da Costa, Pabllo Henrique Costa dos Santos   +2 more
doaj   +1 more source

A soil sensing mechanism to reach carbon flux at a country scale

Soil Science Society of America Journal, Volume 90, Issue 3, May/June 2026.
Abstract Soil is the largest terrestrial carbon reservoir and can be a source or sink of CO2 for the atmosphere, depending on management practices. CO2 emissions from the soil surface (FCO2) are directly related to the biological and physicochemical soil properties. Our objective was to estimate and spatialize the net ecosystem production (NEP) for the
Heidy Soledad Rodríguez‐Albarracín, José A. M. Demattê, Miguel Palacio Pelaez Carvalho Neto, Nícolas Augusto Rosin, Carlos Eduardo Pellegrino Cerri, Carlos Antonio da Silva Junior, José R. de Sousa Lima, Eduardo S. de Souza, Mara Regina Moitinho, Aquiles Enrique Darghan Contreras, Paulo Eduardo Teodoro, Rafael Felippe Ratke, Uemeson José dos Santos, Denizard Oresca   +13 more
wiley   +1 more source

Variabilidade espacial de atributos mineralógicos de um latossolo sob diferentes formas do relevo: I - mineralogia da fração argila Spatial variability of mineralogical attributes of an oxisol under different relief forms: I - clay fraction mineralogy

Revista Brasileira de Ciência do Solo, 2008
A distribuição dos minerais da fração argila depende de condições pedoambientais específicas. O estudo das relações entre atributos desses minerais e locais específicos de sua ocorrência na paisagem torna-se importante para o entendimento das relações ...
Livia Arantes Camargo, José Marques Júnior, Gener Tadeu Pereira, Renata Alves Horvat   +3 more
doaj   +1 more source

Weakening Processes in Carbonate‐Hosted Faults: Phyllosilicate Microlayers and Injections Along the Mattinata Fault (Southern Italy)

Journal of Geophysical Research: Solid Earth, Volume 131, Issue 5, May 2026.
Abstract Micrometric phyllosilicate films along fault slip surfaces (SSs) can drastically reduce friction, yet they are unexpected in clay‐poor carbonate platforms. We inquire how a major carbonate‐hosted, seismogenic strike‐slip fault can develop weak slip interfaces and undergo dynamic weakening despite an intrinsically strong host rock.
Rachele Calvanelli, Luca Aldega, Andrea Billi, Andrea Cavallo, Manuel Curzi, Marco Mercuri, Michele Morsilli, Alessio Pontesilli, Cecilia Viti, Eugenio Carminati   +9 more
wiley   +1 more source

Caracterização química e mineralógica de agregados de diferentes classes de tamanho de Latossolos Bruno e Vermelho localizados no estado do Paraná Chemical and mineralogical characterization of the different structure size classes of Red-Yellow and Dusky Red Latosols in Paraná, Brazil

Revista Brasileira de Ciência do Solo, 2008
O teor e a forma dos minerais da fração argila são determinantes na definição da morfologia dos agregados do solo. Objetivando estudar a mineralogia da fração argila e as propriedades químicas de diferentes classes de agregados de Latossolos (Latossolo ...
Vander de Freitas Melo, Fernando Henrique Toledo, Rodrigo de Moura, Valmiqui Costa Lima, André Ademir Ghidin   +4 more
doaj   +1 more source

Cenozoic Time Constraints on the Evolution of a Gleysol‐Ferralsol‐Podzol Toposequence, Northwest Amazon Basin, Brazil

European Journal of Soil Science, Volume 77, Issue 3, May–June 2026.
ABSTRACT Deciphering the time milestones of clay formation is crucial for modeling the evolution of major geological systems near the Earth's surface. In the present study, kaolinite samples collected along four vertical profiles within a Gleysol‐Ferralsol‐Podzol soil toposequence near São Gabriel da Cachoeira, NW Amazon Basin (Brazil) are dated using ...
Célia Regina Montes, Thierry Allard, Madeleine Sélo, Yves Lucas, Chloé Fourdrin, Öykü Ataytür, Débora Ayumi Ishida, Etienne Balan, Adolpho José Melfi   +8 more
wiley   +1 more source

Differences in Recycled Amendment Phosphorus Solubility and Transport When Interfaced to Soils of Dissimilar Characteristics

Soil Use and Management, Volume 42, Issue 2, April‐June 2026.
ABSTRACT Increasing phosphorus (P) fertilizer use efficiency from bio‐based waste products (i.e., recycled amendments) requires promoting a larger proportion of bioavailable P in soil for plant uptake. Therefore, this study aimed to elucidate how recycled amendment P solubility and movement vary when interfaced with soils of contrasting characteristics.
Aimée Schryer, Pietro Sica, Peter K. Leinweber, Emmanuel Frossard, Jolanda Reusser, Dorette Müller‐Stöver, Jakob Magid   +6 more
wiley   +1 more source