Effects of ultrasound and high pressure argon on physico-chemical properties of white mushrooms (Agaricus bisporus) during postharvest storage

2013 ◽  
Vol 82 ◽  
pp. 87-94 ◽  
Author(s):  
Camel Lagnika ◽  
Min Zhang ◽  
Kebitsamang Joseph Mothibe
Keyword(s):  
High Pressure ◽  
Agaricus Bisporus ◽  
Chemical Properties ◽  
Postharvest Storage ◽  
Physico Chemical

scholarly journals Chemistry of silver(II): a cornucopia of peculiarities

2015 ◽  
Vol 373 (2037) ◽  
pp. 20140179 ◽  
Author(s):  
Wojciech Grochala ◽  
Zoran Mazej
Keyword(s):  
Thermal Decomposition ◽  
High Pressure ◽  
Spin Polarization ◽  
Periodic Table ◽  
Chemical Properties ◽  
Cationic Form ◽  
Physico Chemical ◽  
Jahn Teller ◽  
Jahn Teller Effect ◽  
Strong Spin

Silver is the heavier congener of copper in the Periodic Table, but the chemistry of these two elements is very different. While Cu(II) is the most common cationic form of copper, Ag(II) is rare and its compounds exhibit a broad range of peculiar physico-chemical properties. These include, but are not limited to: (i) uncommon oxidizing properties, (ii) unprecedented large mixing of metal and ligand valence orbitals, (iii) strong spin-polarization of neighbouring ligands, (iv) record large magnetic superexchange constants, (v) ease of thermal decomposition of its salts with O-, N- or C-ligands, as well as (vi) robust Jahn–Teller effect which is preserved even at high pressure. These intriguing features of the compounds of Ag(II) will be discussed here together with (vii) a possibility of electromerism (electronic tautomerism) for a certain class of Ag(II) salts.

scholarly journals Physico-Chemical Changes, Microbiological Properties, and Storage Shelf Life of Cow and Goat Milk from Industrial High-Pressure Processing

Processes ◽  
2020 ◽  
Vol 8 (6) ◽  
pp. 697 ◽  
Author(s):  
Sok Fern Tan ◽  
Nyuk Ling Chin ◽  
Tuan Poy Tee ◽  
Sook Kuan Chooi
Keyword(s):  
High Pressure ◽  
Shelf Life ◽  
Chemical Properties ◽  
Goat Milk ◽  
High Pressure Processing ◽  
Cow Milk ◽  
Plate Count ◽  
Psychrotrophic Bacteria ◽  
Total Plate Count ◽  
Physico Chemical

Industrial high-pressure processing (HPP) was conducted on cow and goat milk in comparison to conventional heat pasteurization. No significant changes were found in the physico-chemical properties of the treated milk except for pH, where pasteurized cow milk experienced a decrease while goat milk’s pH increased for both pasteurized and HPP treated. HPP-treated cow and goat milk both achieved microbial shelf life of 22 days at 8 °C storage with no increase in Bacillus cereus, mesophilic aerobic spores, coliform, yeast and mold but slight increase in psychrotrophic bacteria and total plate count. Pasteurized goat milk was spoilt at the end of storage with exceeding count of psychrotrophic bacteria (9.0 × 108 CFU/mL) and total plate count (3.5 × 108 CFU/mL). HPP-treated cow milk exhibited higher physico-chemical stability than goat milk as evidenced by non-significant change of titratable acidity but goat milk experienced an increase of 0.04% averagely.

Decoration of specific sites on freeze-fractured membranes

1978 ◽  
Vol 36 (2) ◽  
pp. 140-141
Author(s):  
H. Gross ◽  
H. Moor
Keyword(s):  
Pure Water ◽  
Freeze Fracture ◽  
Chemical Properties ◽  
Surface Forces ◽  
Sulfate Pentahydrate ◽  
Copper Sulfate Pentahydrate ◽  
Physico Chemical ◽  
Water Of Hydration ◽  
Small Container ◽  
Binding Forces

Fracturing under ultrahigh vacuum (UHV, p ≤ 10-9 Torr) produces membrane fracture faces devoid of contamination. Such clean surfaces are a prerequisite foe studies of interactions between condensing molecules is possible and surface forces are unequally distributed, the condensate will accumulate at places with high binding forces; crystallites will arise which may be useful a probes for surface sites with specific physico-chemical properties. Specific “decoration” with crystallites can be achieved nby exposing membrane fracture faces to water vopour. A device was developed which enables the production of pure water vapour and the controlled variation of its partial pressure in an UHV freeze-fracture apparatus (Fig.1a). Under vaccum (≤ 10-3 Torr), small container filled with copper-sulfate-pentahydrate is heated with a heating coil, with the temperature controlled by means of a thermocouple. The water of hydration thereby released enters a storage vessel.

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