In the past two decades or so there has been considerable advance in our knowledge of membrane structure. The fluid mosaic model of Singer and Nicolson (1) has had great heuristic value in thinking about membrane topology. In this model both proteins and lipids are free to diffuse in the bilayer, implying a random organization of protein and lipid. However, experimental evidence in diverse type...

In 1987, Blum and Impagliazzo, using techniques of Hartmanis and Hemachandra and Racko , show that if P = NP then P(G) = NP(G) \ coNP(G) = UP(G), where G is a generic oracle. They leave open the question as to whether these collapses occur at higher levels of the polynomial-time hierarchy, i.e., pk(G) = pk(G) \ pk(G) =U pk(G) for k 2. Here we give a negative answer to these questions. In fact, ...

Membrane separations has been increasingly recognized as a key technology platform for improving the energy efficiency of many processes. Likewise, additive manufacturing (AM), or 3-dimensional (3D) printing it is often called, rapidly emergent in industrial sectors. It become common to marry these two platforms take advantage nature 3D with increasing need membrane that adaptable needs. Conven...

OBJECTIVES Injecting drug use is a persistent behaviour that increases the risk of morbidities and mortality. We assessed the burden of hospital separations among people who inject drugs (PWID), the excess compared to the general population and characteristics of separations associated with frequent use. DESIGN Prospective cohort study. SETTING All public and private hospitals in Victoria. ...

Tampereen ammattikorkeakoulu Tampere University of Applied Sciences Paper, Textile and Chemical Engineering Arina Akhmetova: Comparison of ultrafiltration and size-exclusion chromatography performances for proteins desalination Bachelor's thesis 41 pages November 2014 Protein purification is a part of biotechnology. Its application can vary from laboratory researches to industrial production. N...

Interfacial polymerization is widely used today for the production of ultrathin films for encapsulation, chemical separations, and desalination. Polyamide films, in particular, are employed in manufacturing of reverse osmosis and nanofiltration membranes. While these materials show excellent salt rejection, they have rather low water permeability, both properties that apparently stem from the r...

A simplified model of TIRF optics was used to quantitate the relative membrane/substratum separation distances from the spatial pattern of TIRF image brightness. Phase-contrast and total internal reflection fluorescence microscopy (TIRFM) images were collected of bovine aortic endothelial cells (BAEC) plated onto glass microscope slides for 15 min, 30 min and 24 h. BAEC adherent for 15 min show...