Materials scientists explore chromic
materials, that is, materials that change color in response to external stimulus.
"The move from chromic
acid-based chemical solutions to tartaric sulphuric acid meant that the original visual inspection method for crack detection could no longer be utilised," comments Steve Moseley, sales manager at George Koch.
In group 1, polypropylene 5/0 suture was used where as in group 2 chromic
catgut 5/0 was used for suturing.
A mixture of aldehyde (1 mmol), aryl amine (1 mmol), and 3,4-dihydro-2H-pyran or 2,3-dihydrofuran (2 mmol) in THF (10 mL), nano silica chromic
acid (nano SCA) (0.07 g) was added and the mixture stirred at room temperature for an appropriate time.
The apparent digestibility coefficients (ADC) for dry matter, protein, starch, total phosphorous and energy of the animal protein sources were measured indirectly using chromic
oxide (Cr2O3) as an inert marker (Sugiura et al., 1998; Bureau et al., 1999).
The adhesion of PMSQ films was improved on polymethylmethacrylate (PMMA), polycarbonate (PC), and PC/acrylonitrile butadiene styrene (ABS) by pretreating their surface with O2 plasma or chromic
acid followed by surface grafting with trimethyl ethoxysilane (TMES).
A North Wales fire and rescue service spokeswoman said: "500 litres of sulphuric acid and chromic
acid came out of containers into a bunded, metal, treatment area.
A project memorandum said researchers would develop and use "specific functionalising materials, capable of providing multiple protective functions", using layered silicates, carbon nano-tubes, alkoxysilane primers, chromic
materials and antimicrobial microspheres.
-- Perineal repairs involving fast-absorbing polyglactin 910 sutures resulted in less pain and earlier resumption of sexual intercourse for new mothers in a randomized, controlled trial comparing the material with standard polyglactin 910 and chromic
He then concentrates on colorimetry, including means of measurement and the human visual response, appearance technology, order systems, appearance phenomena, viewing conditions, chromic
adaptations and their models.
External suturing was done with 5-0 nylon, and intranasal suturing was done with 5-0 chromic
Gauthier explains that the chromic
acid the company uses is a hazardous chemical.
Current practice calls for the parts to be plated with zinc, and then dipped in a chromic
Hundreds of plastic jerry cans were shipped out to East Africa from Teesside containing mixed chromic
acid and arsenic.
Inorganic reagents examined include: Deionized water; 10% solutions of sodium hydroxide and ammonium hydroxide; non-oxidizing acids, hydrochloric and sulfuric, in concentrated and 10% solutions; and oxidizing acids, nitric and chromic
, concentrated and 10% solutions.