Learn More
An optical biosensor for urea measurements was developed. The operation of the sensor is based on the well-known urease enzyme-catalyzed hydrolysis of urea. The ammonium ions liberated in the reaction are detected with an ion selective optode membrane containing nonactin as ion selective ionophore and ETH 5294 chromoionophore in a thin (1 microm)(More)
In this comparative study, the fabrication and the sensing properties of various reflectometric optical ammonia gas sensors are described. In the first set of experiments the role of the support material was investigated on four different sensor membranes. Two of them were prepared by the adsorption of bromocresol green indicator on anodized aluminum(More)
EXECUTIVE SUMMARY The evolution of e-Government services moves quickly. There is a limited time for adaptation to the new environment in terms of legislation, society, and economy. Maintaining reliable services and a secure IT environment is even more difficult with perpetual changes like mergers and acquisitions, supply chain activity, staff turnover, and(More)
Public administration institutions – as well as citizens and businesses – have to meet challenges of the constantly changing business and legal environment. The complexity and quantity of information to be faced with by these actors is increasing at an alarming rate. Research and development projects must turn to the development of innovative, modern(More)
An opto-electrochemical sensor for copper (II) ion was developed. The sensor consists of a planar conductive indium-tin-oxide (ITO) glass support, which was coated by a polymeric copper (II) sensitive membrane. The sensing membrane is made of plasticized polyurethane matrix containing Zincon colorimetric reagent immobilized as ion pair with(More)
Three generations of alpha,gamma-diaminobutyric acid modified poly(propyleneimine) dendrimers [DAB(AM)n, n = 4, 8, 16] containing 4, 8, 16 free amino groups were coupled with Boc-protected alpha,gamma-diaminobutyric acid (DABA) moieties in high yields. These modified dendrimers were deprotected and the chiral dendritic amines with 8, 16 and 32 amino groups(More)
During the last 2 years we developed a planetary robot station, which consists of a lander and several rovers around. The lander is a Hunveyor type [1-2], the rovers has analytical (mostly chemical) activities around the station. We successfully used the planetary station unit in education of planetary geology , in the construction, building, experiment(More)
Scanning electrochemical microscopy (SECM) with amperometric or potentiometric measuring tips was used to investigate biocatalytic reactions inside the enzyme layer of a biosensor during its operation. The well known glucose oxidase catalyzed oxidation of glucose has been selected for the studies. Local, instantaneous concentration of dissolved oxygen and(More)