We have developed a new test to differentiate between ping-pong and simultaneous mechanisms for tightly coupled anion exchange. This test requires the use of a dead-end reversible noncompetitive inhibitor. As an example, we have applied the test to the anion exchanger of the HL60 cell using the salicylic acid derivative 3,5-diiodosalicylic acid (DIS), which reversibly inhibits HL60 cell Cl/Cl e...

Immobilized lipase from Candida antarctica (Novozym 435) was used in organic media to catalyze esterifications of vitamins (ascorbic acid and retinol) from hydroxy acid. We described the synthesis of retinyl L-lactate by transesterification between retinol and L-methyl lactate with yield reaching 90% and the synthesis of ascorbyl L-lactate by transesterification between ascorbic acid and L-meth...

— Temporal asynchrony between two cameras in the vision system is a usual problem in practice. In some vision task such as estimating fast moving targets, the estimation error caused by the tiny temporal asynchrony will become non-ignorable essentials. This paper will address on the asynchrony in the stereo vision system of humanoid Ping-Pong robot, and present a real-time accurate Ping-Pong ba...

To prevent active attack, an one-way quantum identity authentication scheme is proposed by employing mechanism of ping-pong protocol and property of quantum controlled-NOT gate. It can verify the user’s identity as well as distribute an updated key as the authentication key. Analytical results show the proposed scheme is secure under general individual attack. © 2006 Elsevier B.V. All rights re...

copper amine oxidases are important enzymes, which contribute to the regulation of mono- and polyamine levels. each monomer contains one cu(ii) ion and 2,4,5-trihydroxyphenylalanine (tpq) as cofactors. they catalyze the oxidative deamination of primary amines to aldehydes with a ping-pong mechanism consisting of a transamination. the mechanism is followed by the transfer of two electrons to mol...

The kinetic mechanism of the rod outer segment (ROS) isoprenylated protein methyltransferase was investigated. This S-adenosyl-L-methionine (AdoMet)-linked enzyme transfers methyl groups to carboxyl-terminal isoprenylated cysteine residues of proteins, generating methyl esters. The enzyme also processes simple substrates such as N-acetyl-S-farnesyl-L-cysteine (L-AFC). Initial studies showed tha...

This paper presents the creation of the Pong game running on an FPGA with a computer display connected to it. The game is optimized to work on both LCD and CRT displays too. The game is implemented from scratch, it has the two pads (one read and one blue) drawn on the screen, the green ball is also drawn and the background is painted in white. Everything is implemented in hardware on an FPGA, s...

In this paper we propose a Ping – Pong transitions on web applications. The numerical values of parameters in real time situations are not exactly predictable; to overcome this we are using a fuzzy criterion through possibilities which are represented as a triangular fuzzy number. We introduce a method to study the long term behavior (steady state) of Ping – Pong transitions using Fuzzy Markov ...

Security of the "ping-pong" quantum communication protocol recently proposed by Boström and Felbinger [Phys. Rev. Lett. 89, 187902 (2002)]] is analyzed in the case of considerable quantum channel losses. The eavesdropping scheme is presented, which reveals that the ping-pong protocol is not secure for transmission efficiencies lower than 60%. Our scheme induces 50% losses, which, however, can b...