scholarly journals Jaws of Platynereis dumerilii: Miniature Biogenic Structures with Hardness Properties Similar to Those of Crystalline Metals

JOM ◽  
2021 ◽  
Author(s):  
Luis Zelaya-Lainez ◽  
Giuseppe Balduzzi ◽  
Olaf Lahayne ◽  
Kyojiro N. Ikeda ◽  
Florian Raible ◽  
...  
Keyword(s):  
Inductively Coupled Plasma ◽  
Indentation Depth ◽  
Organic Matrix ◽  
Structure Property ◽  
Structural Protein ◽  
Inductively Coupled ◽  
Property Relations ◽  
Biogenic Structures ◽  
Platynereis Dumerilii ◽  
Bristle Worms

AbstractNanoindentation, laser ablation inductively coupled plasma mass spectroscopy and weighing ion-spiked organic matrix standards revealed structure-property relations in the microscopic jaw structures of a cosmopolitan bristle worm, Platynereis dumerilii. Hardness and elasticity values in the jaws’ tip region, exceeding those in the center region, can be traced back to more metal and halogen ions built into the structural protein matrix. Still, structure size appears as an even more relevant factor governing the hardness values measured on bristle worm jaws across the genera Platynereis, Glycera and Nereis. The square of the hardness scales with the inverse of the indentation depth, indicating a Nix-Gao size effect as known for crystalline metals. The limit hardness for the indentation depth going to infinity, amounting to 0.53 GPa, appears to be an invariant material property of the ion-spiked structural proteins likely used by all types of bristle worms. Such a metal-like biogenic material is a major source of bio-inspiration.

Organic matrix effects in inductively coupled plasma mass spectrometry: a tutorial review

2021 ◽  
pp. 1-29
Author(s):  
Shenghua Liu ◽  
Zhantao Han ◽  
Xiangke Kong ◽  
Jing Zhang ◽  
Zhe Lv ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Inductively Coupled Plasma ◽  
Matrix Effects ◽  
Organic Matrix ◽  
Inductively Coupled ◽  
Plasma Mass Spectrometry

scholarly journals Pharmaceutical Standardization and Physicochemical Characterization of Traditional Ayurvedic Marine Drug: Incinerated Conch Shell (Shankha Bhasma)

Marine Drugs ◽  
2018 ◽  
Vol 16 (11) ◽  
pp. 450
Author(s):  
Sandeep Chavan ◽  
Sonali Tayade ◽  
Vidya Gupta ◽  
Vineeta Deshmukh ◽  
Sadanand Sardeshmukh
Keyword(s):  
Inductively Coupled Plasma ◽  
Aloe Vera ◽  
Physicochemical Characterization ◽  
Optical Emission ◽  
Organic Matrix ◽  
Emission Spectrometry ◽  
Inductively Coupled ◽  
Chemical Characters ◽  
Analytical Tools ◽  
Physical And Chemical

Natural resources such as plants, animals and minerals have always been used by mankind to develop drugs and marine world is no exception. Marine by-products like conches, pearls, mother of pearl shells, corals and so forth have been used by traditional Ayurvedic practitioners for centuries. The unique methods of these preparations are scientifically designed to eliminate unwanted impurities and convert them into bioavailable form. In this study, Conch (Xanchus pyrum) was used as a marine resource of calcium carbonate and was converted pharmaceutically from its aragonite form to calcite. All the steps of preparations and changes in the properties therein were documented and validated. Further, traditional as well as modern analytical tools were used to study its physical and chemical characters to develop a monograph. The physical characterization included particle size, X-ray diffraction (XRD), Scanning Electron Microscopy (SEM), Thermogravimetric Analysis (TGA) and Fourier Transform Infra-red (FTIR). Metal composition and heavy metal limits were determined using Inductively Coupled Plasma Optical Emission Spectrometry (ICPOES). This study revealed the rearrangement of aragonite crystals into calcite form by grinding, trituration with aloe vera juice and incineration under controlled conditions. Moreover, the finished product was found to be devoid of organic matrix that is nacre. This study creates a foundation for the development of a master formula for commonly used Shankha Bhasma in Ayurvedic medicines.

Determination of Cl, Br and I in soils by ICP-MS: microwave-assisted wet partial digestion using H2O2in an ultra-high pressure system

2018 ◽  
Vol 33 (4) ◽  
pp. 649-657 ◽  
Author(s):  
Leticia S. F. Pereira ◽  
Michele S. P. Enders ◽  
Gabrielle D. Iop ◽  
Paola A. Mello ◽  
Erico M. M. Flores
Keyword(s):  
Inductively Coupled Plasma ◽  
Organic Matrix ◽  
Matrix Composition ◽  
Pressure System ◽  
Inductively Coupled ◽  
Partial Digestion ◽  
System P ◽  
Icp Ms ◽  
Plasma Mass Spectrometry

In this study, we proposed a method for halogen determination using inductively coupled plasma mass spectrometry (ICP-MS) after partial digestion of soils basically using H2O2as a reagent for organic matrix composition.

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