a simple method has been developed for the preconcentration of lead (ii) based on the adsorption of its 1-(2-pyridyl azo)2-naphtol (pan) complex on aoctadecyl bonded silica cartridges. the influence of acidity, eluting agents, stability of the column, sample volume and interfering ions has been investigated in detail. the adsorbed complex could be eluted using environmentally benign hno34m and ...

radiolabeled porphyrins are potential tumor avid radiopharmaceuticals because of their impersonation in the human body, ability to complex various radionuclides, water solubility, low toxicity etc. in this work a radiogallium porphyrin complex has been developed. [67ga] labeled 5,10,15,20-tetrakis(3,4-dimethoxyphenyl) porphyrin ([67ga]-tdmpp) was prepared using freshly prepared [67ga]gacl3 and ...

Although H2O has been the topic of considerable research since the beginning of the century, the peculiar physical properties are still not well understood. First we discuss some of the anomalies of this `complex fluid'. Then we describe a qualitative interpretation in terms of percolation concepts. Finally, we discuss recent experiments and simulations relating to the hypothesis that, in addit...

Due to the complexity of the effects, it is difficult to achieve photorealism and physically correct motion in interactive 3-D water simulations. We present a simulation and visualization method which goes a long way towards physical reality, e. g. by producing Kelvin ship waves and displaying images of real caustics on the water surface. Using efficient approximations and employing the special...

A new general framework for shape extraction is presented, based on the paradigm of water flow. The mechanism embodies the fluidity of water and hence can detect complex shapes. A new snake-like force functional combining edge-based and region-based forces produces capability for both range and accuracy. Properties analogous to surface tension and adhesion are also applied so that the smoothnes...

In the course of attempts to find water-soluble derivatives of riboflavin, a study was made of the complexes formed between riboflavin and compounds of boron. The discovery was made that when proper pH control is exercised stable solutions of riboflavin-boron complex can be prepared of at least 25 times the natural solubility of riboflavin; i.e., a concentration of about 0.3 per cent as against...

About a year ago there was a major crisis about the water supply in Walkerton, a small Ontario Town in a farming area near Georgian Bay. In May 2000, there was a sudden outbreak of bloody diarrhea that affected up to half the town population of 5000, sent almost 900 people to get medical attention, hospitalized almost 100 of them and killed at least 7 people. It was shown that Escherichia coli ...

Possibilities of applying satellite means for monitoring of sea and ocean water areas are considered. Significant parameters of water environment registered by modern advanced space means and problems than can be solved using these means are analyzed. Some results obtained during complex satellite monitoring of anthropogenic influences on Mamala Bay water area (Honolulu, Hawaii) in 2002-2004 ar...