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Kinetics of organophosphorus pesticide inhibition of acetylcholinesterase (E.C.3.1.1.7) from the head of Tryporyza nivella (Fabr.) (Lepidoptera:Pyralidae)

100%

Pandey G.

Folia Biologica

1995

vol. 43

issue 3-4

161-167

Kinetic constans(Kd, k2 and ki values) for the inhibition of the Tryporyza nivella head acetylcholinesterase (ChE)by organophosphorus (Trichlorfon, Malaoxon and Diazoxon) pesticides were determined in vitro.These compounds showed a high affinity for AChE and the affinity constans (Kd).There was a little variation among the phosphorylation constans (K2), indicating a minor role for the phosphorylation step in the inhibition process.The significant variation of the molecular reaction (ki) of these compounds could be attributed to variation in the Kd rather than to the K2.Trichlorfon, having a higher ki value, was found to be less toxic than Malaoxan and Diazoxon.

Ultrasonic Attenuation in Binary Alloys

63%

Kor S., Pandey G.

Acta Physica Polonica A

1998

vol. 93

issue 3

491-497

An attempt was made to study the ultrasonic attenuation in Cu-Zn, Ag-Cd, Ag-Mg and Ag-Zn alloys, due to phonon-phonon interaction at 300 K. The Morse potential was used to evaluate the second and third order elastic constants. How far the neighbouring atoms are effective and contributing to ultrasonic attenuation was studied. It is concluded that most of the ultrasonic attenuation is covered by the atoms from 1st to 8th shell. The contribution to ultrasonic attenuation due to 9th shell to 12th shell is very small. It is also concluded that alloys behave more or less in the same manner as metals.

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1 Acta Physica Polonica A

1 Folia Biologica

1 1998

1 1995

2 Pandey G.

1 Kor S.

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Kinetics of organophosphorus pesticide inhibition of acetylcholinesterase (E.C.3.1.1.7) from the head of Tryporyza nivella (Fabr.) (Lepidoptera:Pyralidae)

Ultrasonic Attenuation in Binary Alloys