In Situ Monitoring of Generation and Precipitation of Ferric Hydroxide Sol with a Piezoelectric Quartz Crystal Impedance Analyzer

2001 ◽  
Vol 236 (2) ◽  
pp. 282-289 ◽  
Author(s):  
Youyu Zhang ◽  
Qingji Xie ◽  
Fan Yin ◽  
Shouzhuo Yao
Keyword(s):  
Quartz Crystal ◽  
Ferric Hydroxide ◽  
In Situ Monitoring ◽  
Impedance Analyzer ◽  
Piezoelectric Quartz ◽  
Piezoelectric Quartz Crystal

Analysis for Effect of Dimehypo on Proteolytic Enzyme Activity in the Midgut of the Spider Pardosa pseudoannulata with a Piezoelectric Quartz Crystal Impedance

2011 ◽  
Vol 345 ◽  
pp. 387-392
Author(s):  
Wen Hui Fu ◽  
Jun Fang ◽  
Zhi Wang
Keyword(s):  
Enzyme Activity ◽  
Proteolytic Enzyme ◽  
Quartz Crystal ◽  
Low Dose ◽  
In Situ Monitoring ◽  
Viscosity Change ◽  
Pardosa Pseudoannulata ◽  
Piezoelectric Quartz ◽  
Proteolytic Enzyme Activity ◽  
Piezoelectric Quartz Crystal

A piezoelectric quartz crystal impedance technique has been applied for in situ monitoring of the whole process of the proteolytic enzyme-catalyzed hydrolyzation of casein and the effect of pesticide dimehypo (formula: C5H11NNa2O6S4) on the proteolytic enzyme activity in the midgut of the spider Pardosa pseudoannulata, based on its real-time reponses to the density-viscosity change of the tested solution due to the hydrolyzation occurring on the casein molecules. The results indicated that the hydrolyzation was significantly increased in the presence of low-dose dimehypo, where significantly inhibited in the presence of high-dose dimehypo, and a correlation was found precisely between the enzyme activity reflected by the final frequency shift after the hydrolyzation and the concentration of dimehypo, with a significant frequency response observed even at a 2.88 x 10-4 volume ratio of dimehypo to distilled water. The present work may have presented a novel method feasible for study on the mechanism of excitability of spiders under low-dose dimehypo pesticide and quick detection of proteolytic enzyme activity.

UV Light Detection Using Resonance Frequency of Piezoelectric Quartz Crystal

2021 ◽  
pp. 1-5
Author(s):  
Surajit Das ◽  
Ashok Kumar ◽  
Ajay Kumar ◽  
Jitendra Singh ◽  
Rajan Jha ◽  
...  
Keyword(s):  
Resonance Frequency ◽  
Quartz Crystal ◽  
Uv Light ◽  
Light Detection ◽  
Piezoelectric Quartz ◽  
Piezoelectric Quartz Crystal

Application of a piezoelectric quartz crystal as a partition detector. Development of a digital sensor

1973 ◽  
Vol 45 (2) ◽  
pp. 325-332 ◽  
Author(s):  
Michael A. Grayson ◽  
Ram L. Levy ◽  
Clarence J. Wolf
Keyword(s):  
Quartz Crystal ◽  
Piezoelectric Quartz ◽  
Piezoelectric Quartz Crystal
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