Membrane processing

This work demonstrated the potential of US for mitigating membrane fouling. However, the integration of the US transducers within the membrane system will be a major challenge for the application of US in membrane cleaning. It is more appropriate that US is used as pre-treatment to the membrane system, the transducers can be placed prior to the coagulant feed line. Further work on the determination of the detailed mechanisms associated with enhancing coagulation would enable optimisation of the system with regard to process, cost and energy efficiency.

108p runthenight05 01-03-2023 17 3   Download

The research herein builds on the work of Rojek (2003) and further investigates the bioremediation of NOM wastes. The aim of this research was to evaluate the effectiveness of selected white-rot fungi and yeast for the biodegradative removal of concentrated NOM from solution. The effectiveness of the white-rot fungus P. chrysosporium ATCC 34541 for the biological degradation of different batches of MIEXTM NOM concentrate and the effects of different characteristics of the NOM on the process and thus the resistance of the NOM to microbial removal were investigated.

131p runthenight05 01-03-2023 11 3   Download

Study on fabrication proton exchange membrane fuel cell (PEMFC). Characteristics and selection of the optimal catalyst material and composition for the catalyst layer in membrane electrodes assembly (MEA) and to evaluate influence of manufacturing technological parameters on MEA properties and from that basis master core technology to develop MEA manufacturing process.

28p trinhthamhodang7 31-08-2020 26 2   Download

Sugarcane juice is commonly used as a delicious drink in both urban and rural areas. Sugarcane juice is spoiled quickly due to the presence of simple sugars. Preservation of sugarcane juice was examined to reduce the spoilage and to increase the shelf life by membrane processing. A study was carried out to preserve sugarcane juice by membrane processing and compared with the untreated juice.

8p chauchaungayxua6 26-06-2020 12 2   Download

Main contents of thesis: Introdution of fuel cell and studies on Pt catalysts and Pt alloy catalysts in PEMFC. Research on synthesis of catalytic materials Pt/C 20% wt. by electroless deposition method and evaluating to influence of experimental parameters such as pH, temperature... in the synthesis process on the properties of catalyst Pt / C 20%wt.

22p xacxuoc4321 09-07-2019 55 4   Download

Department of Medical Biochemistry and Biology, University of Bari, Italy; 2Department of Zoology, Laboratory of Histology and Comparative Anatomy, University of Bari, Italy; 3Center for the Study of Mitochondria and Energy Metabolism (CNR) Bari, Italy Mitochondrial bioenergetic impairment has been found in the organelles isolated from rat liver during the prereplicative phase of liver regeneration.

9p system191 01-06-2013 37 4   Download

In avian species, an egg envelope homologous to the mammalian zona pellucida is called the perivitelline membrane. We have previously reported that one of its components, a glycoprotein homologous to mammalian ZPC, is synthesized in the granulosa cells of the quail ovary. In the present study, we investigated the proteolytic cleavage of the newly synthesized ZPC and the secretion of ZPC from the granulosa cells. Western blot analysis of the cell lysates demonstrated that the 43-kDa protein is the precursor of mature ZPC (proZPC), and is converted to the 35-kDa protein before secretion. ...

9p research12 01-06-2013 37 4   Download

A severe challenge to the idea that mitochondrial DNA mutations play a major role in the aging process in mammals is that clear loss-of-function mutations accumulate only to very low levels (under 1% of total) in almost any tissue, even by very old age. Their accumulation is punctate: some cells become nearly devoid of wild-type mitochondrial DNA and exhibit no activity for the partly mitochondrially encoded enzyme cytochrome c oxidase. Such cells accumulate in number with aging, suggesting that they survive indefinitely, which is itself paradoxical....

7p research12 01-06-2013 29 3   Download

As an adaptation process to the growth retardation provoked by the presence of nonlethal concentrations of ergosterol biosynthesis inhibitors, Ustilago maydis alters the ratio of linoleic to oleic acid bound to plasma membrane ´ complex lipids [Hernandez, A., Cooke, D.T., Lewis, M. & Clarkson, D.T. (1997) Microbiology 143, 3165–3174]. This alteration increases plasma membrane H+-ATPase hydrolytic activity.

6p research12 01-06-2013 39 4   Download

The adenosine A2a receptor belongs to the seven trans-membrane helix G-protein-coupled receptor family, is abundant in striatum, vasculature and platelets and is involved in several physiological processes such as blood pressure regulation and protection of cells during anoxia. For structural and biophysical studies we have expressed the human adenosine A2areceptor (hA2aR) at high levels inserted into the Escherichia coliinner membrane, and established a puri®cation scheme.

11p research12 29-04-2013 52 4   Download

ThemaltoseATP-binding cassette transporter ofSalmonella typhimurium is composed of a membrane-associated com-plex (MalFGK2) and a periplasmic receptor (MalE). In addition to its role in transport, the complex acts as a repressor ofmaltose-regulatedgene expressionand is subject to inhibition in the process of inducer exclusion. These activities are thought to be mediated by interactions of the ATPase subunit, MalK, with the transcriptional activator, MalT, and nonphosphorylated enzyme IIA of the glucose phosphotransferase system, respectively. ...

12p research12 23-04-2013 36 3   Download

BACE2 (Memapsin 1) is a membrane-bound aspartic pro-tease that is highlyhomologouswithBACE1 (Memapsin 2). While BACE1 processes the amyloid precursor protein (APP) at a key step in generating theb-amyloid peptide and presumably causes Alzheimer’s disease (AD), BACE2 has not been demonstrated to be directly involved in APP pro-cessing, and its physiological functions remain to be deter-mined.In vivo, BACE2 is expressed as a precursor protein containing pre-, pro-, protease, transmembrane, and cyto-solic domains/peptides....

10p tumor12 22-04-2013 25 2   Download

The major components of neuritic plaques found in Alzheimer disease (AD) are peptides known as amyloid b-peptides (Ab),which derive from the proteolitic cleavage of theamyloidprecursorproteins.InvitroAbmayundergoa conformational transition from a soluble form to aggrega-ted,fibrillary b-sheet structures,which seem to be neuro-toxic. Alternatively,it has been suggested that ana-helical form can be involved in a process of membrane poration, which would then trigger cellular death.

7p tumor12 22-04-2013 38 2   Download

Targeting of proteins to and translocation across the membranes is a fundamental biological process in all organisms. In bacteria, the twin arginine translocation (Tat) system can transport folded proteins. Here, we demonstrate in vivo that the high potential iron-sulfur protein (HiPIP) from Allochromatium vinosumis trans-located into the periplasmic space by the Tat system of Escherichia coli. In vitro, reconstituted HiPIP precursor (preHoloHiPIP) was targeted to inverted membrane vesicles from E. ...

11p tumor12 20-04-2013 32 2   Download

The intracellular role of placental protein 17b (PP17b)/ TIP47has been controversial, because it is considered tobe a protein required for mannose 6-phosphate receptor trans-port from endosome totrans-Golgi as well as a neutral lipid droplet-associatedprotein.The similaritybetween theamino acid sequences of PP17 variants, adipophilin and perilipins, andbetween their gene structures indicate that PP17baswell as other alternatively spliced PP17 variants belong to the lipid storage droplet protein family, containing also some differentiation factors....

13p tumor12 20-04-2013 40 3   Download

Topogenesis of cytochrome P450scc, a resident proteinof the inner membrane of adrenocortical mitochondria, is still obscure. In particular, little is known about the cause of its tissue specificity. In an attempt to clarify this point, we examined the process in Saccharomyces cerevisiae cells synthesizing cytochrome P450scc as its native precursor (pCYP11A1) or versions inwhich its N-terminal addressing presequence had been replaced with those of yeast mitoch-ondrial proteins: CoxIV(1–25) and Su9(1–112)....

8p tumor12 20-04-2013 40 4   Download

Tumor necrosis factor-a converting enzyme (TACE or ADAM17) is a member of the ADAM (a disintegrin and metalloproteinase) family of type I membrane proteins and mediates the ectodomain shedding of various membrane-anchored signaling and adhesion proteins. TACE is syn-thesized as an inactive zymogen, which is subsequently proteolytically processed to the catalytically active form.We have identified the proprotein-convertases PC7 and furin to be involved in maturation of TACE.

8p fptmusic 16-04-2013 39 3   Download

Most of the examples of protein translocation across a membrane (such as the import of classical secretory proteins into the endoplasmic reticulum, import of proteins into mitochondria and peroxisomes, as well as protein import into and export from the nucleus), are understood in great detail.

11p fptmusic 16-04-2013 42 4   Download

Cleavage of the arylglycerolb-aryl ether linkage is the most important process in the biological degradation of lignin. Thebacterialb-etherasewasdescribedpreviouslyandshown to be tightly associated with the cellular membrane. In this study, we aimed to detect and isolate a new extracellular function that catalyses theb-aryl ether linkage cleavage of high-molecular lignin in the soil fungi. We screened and isolated 2BW-1 cells by using a highly sensitive fluorescence assay system.

10p fptmusic 16-04-2013 40 4   Download

Folate is an essential vitamin involved in a number of biological processes. High affinity folate binding proteins (FBPs) exist both as glycosylphospha-tidylinositol-linked, membrane associated folate binding proteins and as soluble FBPs in plasma and some secretory fluids such as milk, saliva and semen. The function and significance of FBPs are unresolved, however, it has been suggested that they may facilitate folate uptake, e.g. during suck-ling.

8p fptmusic 11-04-2013 41 2   Download