In chemical measurements (for instance in titrimetric analysis) it is very important to precisely measure amount of liquid, the measurement is performed with use of various measuring vessels. Presently laboratories use all kinds of glass measuring vessels like: beakers, flasks, etc., for measurement of bigger volumes of liquid, and in case of small volumes glass pipettes. Glass pipettes have be...

In these methods, the response of the test organism to graded concentrations of the substance being assayed is determined, after a suitable incubation period, by measurement of the amount of growth in terms of dry cell weight. Under the conditions of assay, this weight is proportional to the concentration of the limiting factor. By comparing the response of the test organism to the sample being...

A CMOS MEMS platform for gravimetric biosensing in liquid has been fabricated and tested. The concept is an aluminum and silicon dioxide membrane, coated with polystyrene and functionalized with receptors. When the protein analyte binds to the receptors, the sensor mass increases which causes a shift in the resonant frequency. The device is electrostatically actuated and the displacement is sen...

In view of the increasing importance of acid-base equilibrium and of the r81e of the inorganic elements in the body economy, the accurate determination of sodium in the blood and body fluids becomes of increasing importance. Barber and Kolthoff (1) in 1928 were the first to employ the triple salt, uranyl zinc sodium acetate, for the quantitative determination of sodium. They ascribed to t,his s...

Objective This study aims to compare the accuracy of visual, quantitative gravimetric, and colorimetric methods used to determine blood loss during cesarean delivery procedures employing a hemoglobin extraction assay as the reference standard. Study Design In 50 patients having cesarean deliveries blood loss determined by assays of hemoglobin content on surgical sponges and in suction canisters...

Functionalized nanoporous materials have been developed recently as bio/chemical sensing materials. Due to the huge specific surface of the nano-materials for molecular adsorption, high hopes have been placed on gravimetric detection with micro/nano resonant cantilevers for ultra-sensitive sensing of low-concentration bio/chemical substances. In order to enhance selectivity of the gravimetric r...

Great uncertainty exists around indoor biomass burning exposure-disease relationships due to lack of detailed exposure data in large health outcome studies. Passive nephelometers can be used to estimate high particulate matter (PM) concentrations during cooking in low resource environments. Since passive nephelometers do not have a collection filter they are not subject to sampler overload. Nep...