Abstract Marble waste contains a high level of calcium, which is obtained from the cutting process in marble production. The properties geopolymer binders are influenced not only by amount alkali activators, their ratio, molarity used, and Si Al content mineral additives used mixture, but also duration heat treatment temperature. This study aimed to produce alkali-activated based on fly ash dus...

In this study sodium alginate (NaAlg)/poly(vinyl pyrrolidone) (PVP) blend membranes were prepared and crosslinked with CaCl2 (0.1 Molarity (M)) for the separation of aqueous/dimethylformamide (DMF) mixtures. Membranes were characterized by Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM) and their performance was examined by varying experimental parameters such...

Concentration of Osmotically active solutes plays a key role in an acceptance of parenteral infusions by patients. It is generally recommended that labels of infusions should list osmolarity (osmol/l). However, osmometer can only read osmolality (osmol/kg). The conversion of the experimental readings to the declared osmotic concentration wants to study the relationship between osmolality and os...

The effect of potassium on the longitudinal muscle-myenteric plexus (LM-MP) preparation from guinea-pig was studied. The strips were exposed to elevated K+ (30 mM, 60 mM, 90 mM, 120 mM or 150 mM). A phasic contraction of the LM-MP was caused by 10 mM K+ or 15 mM K+ followed by an increase of the contractile activity probably due to the increase in acetylcholine release. A higher molarity of K+ ...

Nature's enzymes are an ongoing source of inspiration for scientists. The complex processes behind their selectivity and efficiency is slowly being unraveled, and these findings have spawned many biomimetic catalysts. However, nearly all focus on the conversion of small molecular substrates. Nature itself is replete with inventive catalytic systems which modify, replicate, or decompose entire p...

Measurments with combination pH electrodes of the pH of the dilute buffers used in a commercial kit (CEA-Roche) for assay of carcinoembryonic antigen resulted in pH values 0.1 to 0.3 unit lower than pH values measured on an electrode system with a capillary junction. If the pH values of these buffers were adjusted, based on such measurements, an error in the assay of 0.2 to 0.6 ng/ml in the 1.5...

We derive a model for voltage-induced wetting, so-called electrowetting, from the principle of virtual displacement. Our model includes the possibility that charge is trapped in or on the wetted surface. Experimentally, we show reversible electrowetting for an aqueous droplet on an insulating layer of 10 µm thickness. The insulator is coated with a highly fluorinated layer impregnated with oil,...

The chromatographic behaviour of 27 different plasma proteins on fractionation of human plasma on immobilized Cibacron Blue F3-GA was studied. The column was eluted by using a three-step procedure. First, a low-molarity buffer (30 mM-H3PO4/Na3PO4, pH 7.0, I0.053) was used, then a linear salt gradient (0-1 M-NaCl in the buffer above) was applied, followed by a wash with two bed volumes of 1.0 M-...

Studies were undertaken to determine whether 1-cellderived colony-stimulating factor (CSF) could be purified by a single step affinity chromatographic technique. A quantity of 1 00 x 1 0#{176} units of purified anti-CSF was coupled to cyanogen bromide activated Sepharose 48; colony assays revealed complete binding of the antibodies to the gel. Three 1 0-liter pools of serum-free 1-cell CSF were...