Results 21 to 30 of about 5,797 (153)

Botryoidal and Spherulitic Aragonite in Carbonates Associated with Microbial Mats: Precipitation or Diagenetic Replacement Product?

open access: yesFrontiers in Earth Science, 2021
Similar carbonate fabrics may result from different pathways of precipitation and diagenetic replacement. Distinguishing the underlying mechanisms leading to a given carbonate fabric is relevant, both in terms of an environmental and diagenetic ...
Yuzhu Ge   +6 more
doaj   +1 more source

Trepostome bryozoans encrusting Silurian gastropods: A taphonomic window and its implications for biodiversity [PDF]

open access: yesActa Palaeontologica Polonica, 2022
Silurian turreted gastropods from the Upper Leintwardine Formation, Ludlow Series, collected in Delbury Quarry, Shropshire, UK, are all encrusted by the trepostome bryozoan Homotrypa cochlea sp. nov.
CAROLINE J. BUTTLER   +2 more
doaj   +1 more source

Fluorescent imaging and bio-cellular uptake assessment of gold-near infrared dye conjugated cockle shell calcium carbonate nanoparticle [PDF]

open access: yesIraqi Journal of Veterinary Sciences
In recent years, fluorescent imaging has emerged as an active area of interest in medical imaging. Fluorescent imaging plays a critical role in molecular imaging.
Hanan K. Kiranda   +3 more
doaj   +1 more source

A Review and Meta-Analysis of Potential Impacts of Ocean Acidification on Marine Calcifiers From the Southern Ocean

open access: yesFrontiers in Marine Science, 2021
Understanding the vulnerability of marine calcifiers to ocean acidification is a critical issue, especially in the Southern Ocean (SO), which is likely to be the one of the first, and most severely affected regions.
Blanca Figuerola   +7 more
doaj   +1 more source

Isotopic-geochemical features of thermal water of the Kyndyg deposit (Republic of Abkhazia)

open access: yesЛитосфера, 2020
Subject. The aim of the work is to study the mechanism and sources of water formation, as well as the peculiarities of carbonate mineralization in the aquifer of the Kyndyg thermal water deposit. Materials and methods.
S. S. Potapov   +7 more
doaj   +1 more source

Analysis of calcium carbonate for differentiating between pigments using terahertz spectroscopy [PDF]

open access: yesJournal of the European Optical Society-Rapid Publications, 2009
Calcium carbonate that is used as an art pigment exhibits strong absorption at approximately 3 THz. In this study, the authors investigated the relation between the absorption and the condition of calcium carbonate crystals.
Mizuno Maya   +3 more
doaj   +1 more source

First-Principle Studies of the Vibrational Properties of Carbonates under Pressure

open access: yesSensors, 2021
Using the density functional theory with the hybrid functional B3LYP and the basis of localized orbitals of the CRYSTAL17 program code, the dependences of the wavenumbers of normal long-wave ν vibrations on the P(GPa) pressure ν(cm−1) = ν0 + (dv/dP)·P + (
Yurii N. Zhuravlev, Victor V. Atuchin
doaj   +1 more source

Bio‐Inspired Synthesis of Macroporous Single Crystal Particles as Scattering Agents

open access: yesAdvanced Functional Materials, EarlyView.
A general strategy is presented that delivers unique, single‐crystal microparticles that combine submicron macroporosity and uniform particle shapes. A bioinspired approach is used to occlude three distinct types of additives – polystyrene microspheres, polymer vesicles and amino acids – within calcite single crystals, and subsequent thermal annealing ...
Stephanie E. Foster   +11 more
wiley   +1 more source

Aragonite toothpaste for management of dental calculus: A double‐blinded randomized controlled clinical trial

open access: yesClinical and Experimental Dental Research, 2022
Objectives Aragonite from animal origin such as cuttlefish bone powder is an abrasive with hardness properties ideal for calculus removal. The purpose of this randomized controlled trial was to test the efficacy of a cuttlebone‐derived aragonite ...
Ashwaq A. Al‐Hashedi   +6 more
doaj   +1 more source

Natural Biomaterials for Osteochondral Repair: From Source to Strategy

open access: yesAdvanced Healthcare Materials, EarlyView.
Biological origin‐guided overview of natural biomaterials and therapeutic strategies for osteochondral tissue engineering. The circular diagram categorizes representative materials and strategies into plant/algae‐derived, microbial‐derived, animal‐derived, and human‐derived sources, centered on an osteochondral defect repair model.
Hengyu Liu   +5 more
wiley   +1 more source

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