Results 71 to 80 of about 4,091 (207)

Morphology and paleoecology of a hybodontiform with serrated teeth, Priohybodus arambourgi, from the Late Jurassic of northeastern Brazil

open access: yesThe Anatomical Record, Volume 309, Issue 1, Page 5-32, January 2026.
Abstract Hybodontiformes was a diverse, successful, and important group of shark‐like chondrichthyans known from a variety of ecosystems. Some representatives of the order had a wide palaeogeographic distribution, as is the case with Priohybodus arambourgi. With a multicuspidate crown, P. arambourgi was the first hybodontiform to develop fully serrated
Estevan Eltink   +5 more
wiley   +1 more source

Influence of latitude and climate on spread, radiation and rise to dominance of early angiosperms during the Cretaceous in the Northern Hemisphere [PDF]

open access: yes, 2012
Our aim is to evaluate the influence of climate and latitude on the rise to dominance of angiosperms in space and time during the Cretaceous.
Coiffard, C., Gomez, Bernard
core   +3 more sources

Citrus reticulata Blanco: A Review on Chemical Composition and Biological Activities

open access: yesChemistry &Biodiversity, Volume 23, Issue 1, January 2026.
This review compiles chemical information and biological activities from 49 studies on Citrus reticulata. The fruit peels stand out for their high content of methoxylated monoterpenes and flavonoids with antioxidant, anti‐inflammatory, and antimicrobial activities.
José Walber Gonçalves Castro   +3 more
wiley   +1 more source

Stratigraphic Relations of the Ipubi Formation: Siliciclastic-Evaporitic Succession of the Araripe Basin

open access: yesAnais da Academia Brasileira de Ciências, 2018
The Ipubi Formation represents the Aptian-Albian siliciclastic-evaporitic succession of Araripe Basin, NE Brazil. This succession comprises siliciclastic rocks (bituminous shales and claystones) and evaporites (gypsum and secondary anhydrite) and ...
CARLOS E. FABIN   +7 more
doaj   +1 more source

Exploring the vicinity of the Bogomol'nyi-Prasad-Sommerfield bound [PDF]

open access: yes, 2001
We investigate systems of real scalar fields in bidimensional spacetime, dealing with potentials that are small modifications of potentials that admit supersymmetric extensions.
Alonso Izquierdo A   +16 more
core   +2 more sources

A NEW AZHDARCHOID PTEROSAUR FROM THE CRATO FORMATION (LOWER CRETACEOUS, APTIAN?) OF BRAZIL [PDF]

open access: yesPalaeontology, 2008
Abstract: A partial pterosaur skull from the Nova Olinda Member of the Crato Formation (Lower Cretaceous, Aptian?) represents a new edentulous pterodactyloid,Lacusovagus magnificensgen. et sp. nov. The absence of teeth and a large nasoantorbital fenestra suggest assignment to Azhdarchoidea, and the combination of a particularly short, crestless and ...
openaire   +2 more sources

A unique exceptionally well-preserved pterosaur skull from the Crato Formation of Brazil [PDF]

open access: yes, 2017
The posterior part of a skull from a tapejarid pterosaur was studied for the exceptional preservation of its soft-tissues. The specimen comes from the Early Cretaceous (Aptian) Crato Formation of northeastern Brazil. It shows a peculiar soft sagittal crest that gives new information about the anatomy and the diversity of tapejarids.
Campos, Hebert Bruno Nascimento   +4 more
openaire   +1 more source

Pricing Derivatives Securities with Prior Information on Long- Memory Volatility [PDF]

open access: yes
This paper investigates the existence of long memory in the volatility of the Mexican stock market. We use a stochastic volatility (SV) model to derive statistical test for changes in volatility. In this case, estimation is carried out through the Kalman
Alejandro Islas Camargo   +1 more
core  

Caryocar brasiliense supercritical CO2 extract possesses antimicrobial and antioxidant properties useful for personal care products [PDF]

open access: yes, 2015
The cosmetic and pharmaceutical industries have an increasing interest in replacing synthetic antimicrobials in dermatological products due to increased microbial resistance to conventional antimicrobial agents.
Lilian FB Amaral   +3 more
core   +1 more source

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