scholarly journals Alkali roasting of bomar ilmenite: rare earths recovery and physico-chemical changes

2014 ◽  
Vol 13 (1) ◽  
Author(s):  
Sergio Sanchez-Segado ◽  
Abhishek Lahiri ◽  
Animesh Jha
Keyword(s):  
Rare Earths ◽  
Chemical Changes ◽  
Physico Chemical

AbstractIn this work, the alkali roasting of ilmenite (FeTiO

Switching selectivity of carboxylic acids and associated physico-chemical changes with pH during electrodialysis of ternary mixtures

2018 ◽  
Vol 193 ◽  
pp. 327-344 ◽  
Author(s):  
Anusha Chandra ◽  
Jogi Ganesh Dattatreya Tadimeti ◽  
E. Bhuvanesh ◽  
Darshak Pathiwada ◽  
Sujay Chattopadhyay
Keyword(s):  
Carboxylic Acids ◽  
Ternary Mixtures ◽  
Chemical Changes ◽  
Physico Chemical

scholarly journals Induction of the synthesis of an additional family of long-chain dolichols in the yeast Saccharomyces cerevisiae. Effect of starvation and ageing.

2002 ◽  
Vol 49 (3) ◽  
pp. 781-787 ◽  
Author(s):  
Anna Szkopinska ◽  
Ewa Swiezewska ◽  
Joanna Rytka
Keyword(s):  
Saccharomyces Cerevisiae ◽  
Stationary Phase ◽  
Yeast Cells ◽  
Logarithmic Phase ◽  
Cellular Membranes ◽  
Yeast Saccharomyces Cerevisiae ◽  
Chemical Changes ◽  
Physico Chemical ◽  
Long Chain

The yeast Saccharomyces cerevisiae strain W303 synthesizes in the early logarithmic phase of growth dolichols of 14-18 isoprene residues. The analysis of the polyisoprenoids present in the stationary phase revealed an additional family which proved to be also dolichols but of 19-24 isoprene residues, constituting 39% of the total dolichols. The transfer of early logarithmic phase cells to a starvation medium lacking glucose or nitrogen resulted in the synthesis of the longer chain dolichols. The additional family of dolichols represented 13.8% and 10.3% of total dolichols in the glucose and nitrogen deficient media, respectively. The level of dolichols in yeast cells increased with the age of the cultures. Since both families of dolichols are present in stationary phase cells we postulate that the longer chain dolichols may be responsible for the physico-chemical changes in cellular membranes allowing yeast cells to adapt to nutrient deficient conditions to maintain long-term viability.

Physico-chemical changes in cladodes of Opuntia ficus-indica as a function of the growth stage and harvesting areas

2020 ◽  
Vol 251 ◽  
pp. 153196
Author(s):  
Belbahloul Mounir ◽  
El Goumi Younes ◽  
Msaad Asmaa ◽  
Zouhri Abdeljalil ◽  
Anouar Abdellah
Keyword(s):  
Growth Stage ◽  
Chemical Changes ◽  
Opuntia Ficus Indica ◽  
Physico Chemical

Understanding the in situ state of lignocellulosic biomass during ionic liquids-based engineering of renewable materials and chemicals

2020 ◽  
Vol 22 (20) ◽  
pp. 6748-6766
Author(s):  
Kalavathy Rajan ◽  
Thomas Elder ◽  
Nourredine Abdoulmoumine ◽  
Danielle Julie Carrier ◽  
Nicole Labbé
Keyword(s):  
Ionic Liquids ◽  
Lignocellulosic Biomass ◽  
Renewable Materials ◽  
Chemical Changes ◽  
Physico Chemical

Morphological and physico-chemical changes in lignocellulosic biomass during ionic liquids-based processing.

Dilution-Induced Physico-Chemical Changes of Metal Oxide Nanoparticles Due to Homeopathic Preparation Steps of Trituration and Succussion

Homeopathy ◽  
2019 ◽  
Vol 109 (02) ◽  
pp. 065-078
Author(s):  
Abhirup Basu ◽  
Mayur K. Temgire ◽  
Akkihebbal K. Suresh ◽  
Jayesh R. Bellare
Keyword(s):  
Temperature Change ◽  
Photoelectron Spectroscopy ◽  
Cupric Oxide ◽  
Morphological Changes ◽  
Metal Oxide Nanoparticles ◽  
Fluid Motion ◽  
Oxide Nanoparticles ◽  
Chemical Changes ◽  
Bubble Generation ◽  
Physico Chemical

Abstract Background Although the presence of starting materials in extreme dilutions of homeopathic medicines has been established, the physico-chemical changes of these materials induced by the manufacturing steps—that is, solid–solid mixing involving grinding (trituration) and slurry mixing involving impact (succussion), followed by dilution—are still unknown. Methods We subjected cupric oxide and zinc oxide nanoparticles (NPs) to the homeopathic processes of trituration and succussion, followed by dilution up to 6 cH. Particle image velocimetry was employed to analyze the fluid motion during succussion and its effect on the NPs. The resulting microstructural and chemical changes at different dilution steps were determined by X-ray photoelectron spectroscopy, Fourier-transform infrared spectroscopy and transmission electron microscopy. Results The succussion triggered multi-sized bubble generation and turbulent fluid motion up to a duration of 400 ms, with maximum average velocity of 0.23 m/s. Due to 1% transfer of kinetic energy from a moving eddy with this velocity, upon collision, the rate of temperature change in a particle of size 1 µm and 1 nm was predicted to rise by approximately 102 K/s and 106 K/s respectively. During trituration, the oxide NPs reduced to metals and did not aggregate by remaining within lactose, but they converted to oxidized finer NPs after impact. Silicate chains leached from the vial cross-linked after third dilution, forming large macro-particles and encapsulating the NPs that were retained and carried at higher dilution steps. Conclusion The results showed that the NPs sustained significant rate of temperature change due to energy transfer from moving eddies during succussion. Different physico-chemical changes, such as size reduction, successive reduction and oxidation of NPs, and morphological changes, were achieved through trituration and succussion. The retention of NPs within cross-linked poly-siloxane chains reveals the importance of both the borosilicate glass vial and the ethanol solution during preparation of homeopathic medicines.

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