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https://www.readbyqxmd.com/read/29235999/life-cycle-assessment-study-on-polishing-units-for-use-of-treated-wastewater-in-agricultural-reuse
#1
Nurdan Büyükkamacı, Gökçe Karaca
A life cycle assessment (LCA) approach was used in the assessment of environmental impacts of some polishing units for reuse of wastewater treatment plant effluents in agricultural irrigation. These alternative polishing units were assessed: (1) microfiltration and ultraviolet (UV) disinfection, (2) cartridge filter and ultrafiltration (UF), and (3) just UV disinfection. Two different energy sources, electric grid mix and natural gas, were considered to assess the environmental impacts of them. Afterwards, the effluent of each case was evaluated against the criteria required for irrigation of sensitive crops corresponding to Turkey regulations...
December 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/29234499/removal-of-precursors-and-disinfection-by-products-dbps-by-membrane-filtration-from-water-a-review
#2
REVIEW
Mohammad Ali Zazouli, Laleh R Kalankesh
Disinfection by-products (DBPs) have heterogeneous structures which are suspected carcinogens as a result of reactions between NOMs (Natural Organic Matter) and oxidants/disinfectants such as chlorine. Because of variability in DBPs characteristics, eliminate completely from drinking water by single technique is impossible. The current article reviews removal of the precursors and DBPs by different membrane filtration methods such as Microfiltration (MF), Ultrafiltration (UF), Nanofiltration (NF) and Reverse Osmosis (RO) techniques...
2017: Journal of Environmental Health Science & Engineering
https://www.readbyqxmd.com/read/29234081/high-flux-water-purification-using-aluminium-hydroxide-hydrate-gels
#3
Ali Malekizadeh, Peer M Schenk
Filtration of aqueous liquids has wide implications, for example for provision of clean drinking water. Nevertheless, many people still lack access to safe water and suffer from preventable water-borne microbial diseases. This study reports a new ultrafiltration-range separation technology using a gelatinous layer of aluminium hydroxide polyhydrate as a secondary membrane on a retaining fabric that enables simple and cost-effective production of filtered water. Properties include at least 4-fold higher flux rates than currently available membranes, pressure-resistance, impenetrability to filtered particles, easy cleaning by backwashing and simple, cost-effective replacement by gel injection...
December 12, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29230651/preparation-and-assessment-of-carboxylate-polyelectrolyte-as-draw-solute-for-forward-osmosis
#4
Hongtao Cui, Hanmin Zhang, Wei Jiang, Fenglin Yang
Reverse draw solute diffusion not only reduces the water flux in forward osmosis (FO), but also contaminates the feed solution and eventually increases the regeneration cost of draw solution. In the present study, a new polyelectrolyte was synthesized as FO draw solute to address this problem. Acrylic acid and sodium p-styrenesulfonate monomers with hydrophilic group were used to fabricate carboxylate polyelectrolyte through free radical polymerization reaction. Results demonstrated that the osmotic pressure of carboxylate polyelectrolyte solution had a good linear relationship with concentration, and the viscosity of 0...
December 11, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29227585/effect-of-ultrafiltration-on-placental-fetal-blood-flow-in-pregnancy-of-woman-undergoing-chronic-hemodialysis
#5
Luiz Paulo José Marques, Paulo Roberto Silva Marinho, Regina Rocco, Caroline de Azevedo Martins, Henrique Novo Costa Pereira, Ana Clara Lopes Barbosa Ferreira
INTRODUCTION: Patient who was undergoing hemodialysis (HD) thrice weekly usually gain 1 to 4 kg of weight in interdialytic period, mainly due to fluid accumulation by ingestion of water. Ultrafiltration (UF) during HD will be need to remove fluid excess to avoid severe medical complications secondary to fluid overload. However, in pregnant woman UF can increase the episodes of intradialytic hypotension which may lead to placental ischemic injury and predispose to fetal distress. There is little information about safe fluid amount withdrawn by UF during pregnancy...
December 11, 2017: Hemodialysis International
https://www.readbyqxmd.com/read/29226384/the-impact-of-volume-overload-on-right-heart-function-in-end-stage-renal-disease-patients-on-hemodialysis
#6
Serkan Ünlü, Asife Şahinarslan, Gökhan Gökalp, Özden Seçkin, Selim Turgay Arınsoy, Nuri Bülent Boyacı, Atiye Çengel
PURPOSE: The aim of this study was to evaluate the impact of volume overload on echocardiographic parameters used for the assessment of the right ventricle (RV) and right atrium (RA), to determine volume-independent parameters and to noninvasively investigate the physio-mechanics of RV and RA by examining end-stage kidney patients before and after hemodialysis (HD). METHODS: The echocardiographic images were obtained from 67 patients (49.2 ± 17.3 years, 23 f) before and after HD...
December 11, 2017: Echocardiography
https://www.readbyqxmd.com/read/29221829/constitutive-expression-of-the-active-fragment-of-human-vasostatin-vs30-in-pichia-pastoris-smd1168
#7
Sergio Calderon-Salais, Prisiliana Velazquez-Bernardino, Victor E Balderas-Hernandez, Ana P Barba-de la Rosa, Antonio De Leon-Rodriguez
Vasostatin 30 (Vs30) is an active fragment derived from the N-terminal region (135-164aa) of human calreticulin (hCALR) and has the ability to inhibit angiogenesis. In this work, the expression of Vs30 was performed using a protease-deficient strain of the methylotrophic yeast Pichia pastoris. The vs30 gene was optimized for P. pastoris preferential codon usage and inserted into constitutive expression vector pGAPZαA. In addition, a multi-copy strain was obtained using an in vitro multimerization approach...
December 5, 2017: Protein Expression and Purification
https://www.readbyqxmd.com/read/29220051/improving-extraction-and-post-purification-concentration-of-membrane-proteins
#8
Hasin Feroz, HyeYoung Kwon, Jing Peng, Hyeonji Oh, Bryan Ferlez, Carol S Baker, John H Golbeck, Guillermo C Bazan, Andrew L Zydney, Manish Kumar
Membrane proteins (MPs), despite being critically important drug targets for the pharmaceutical industry, are difficult to study due to challenges in obtaining high yields of functional protein. Most current extraction efforts use specialized non-ionic detergents to solubilize and stabilize MPs, with MPs being concentrated by ultrafiltration (UF). However, many detergents are retained during the UF step, which can destabilize MPs and/or interfere with their characterization. Here, we studied the influence of detergent selection on the extraction and UF-based concentration of biomedically-relevant MPs, the light-driven sodium and chloride transporters, KR2 and halorhodopsin (pHR) which are also model proteins for more complex mammalian rhodopsins...
December 8, 2017: Analyst
https://www.readbyqxmd.com/read/29215353/heterotrophic-monitoring-at-a-drinking-water-treatment-plant-by-matrix-assisted-laser-desorption-ionization-time-of-flight-maldi-tof-mass-spectrometry-after-different-drinking-water-treatments
#9
Laura Sala-Comorera, Anicet R Blanch, Carles Vilaró, Belén Galofré, Cristina García-Aljaro
The aim of this work was to assess the suitability of matrix-assisted laser desorption/ionization-time of flight mass spectrometry (MALDI-TOF MS) for routine heterotrophic monitoring in a drinking water treatment plant. Water samples were collected from raw surface water and after different treatments during two campaigns over a 1-year period. Heterotrophic bacteria were studied and isolates were identified by MALDI-TOF MS. Moreover, the diversity index and the coefficient of population similarity were also calculated using biochemical fingerprinting of the populations studied...
October 2017: Journal of Water and Health
https://www.readbyqxmd.com/read/29210684/control-systems-for-olive-mill-wastewater-treatment-with-ultrafiltration-and-nanofiltration-membrane-in-series-based-on-the-boundary-flux-theory
#10
Javier Miguel Ochando-Pulido
Proper membrane process design can be a difficult task to accomplish when fouling is present, and must be faced. Engineers usually consider the project variables concerning productivity and selectivity and follow these targets. However, in the presence of fouling, additional parameters must be considered, implying better knowledge of fouling phenomena. One possible solution to increase the reliability of a process is the use of stable control systems. This article reports a suitable method to reach this target, based on the boundary flux theory...
December 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/29210600/potential-silver-nanoparticles-migration-from-commercially-available-polymeric-baby-products-into-food-simulants
#11
Jeong In Choi, Song Ji Chae, Jung Min Kim, Jae Chun Choi, Se Jong Park, Hee Ju Choi, Hojae Bae, Hyun Jin Park
In recent years, silver nanoparticles (AgNPs) have been extensively employed in food packaging systems as a potential antibacterial agent. Although proven to be highly effective, increased number of AgNP-containing products raises concerns among consumers regarding the migration of AgNPs from the packaging material into foods which may exert toxic effects. To address this, five baby products were chosen (baby bottle A, baby bottle B, pacifier A, pacifier B, and breastmilk storage bag) to investigate AgNPs migration into three food simulants (deionized water, 4% acetic acid (w/v), and 50% ethanol (v/v)) using inductively coupled plasma mass spectrometry (ICP-MS)...
December 6, 2017: Food Additives & Contaminants. Part A, Chemistry, Analysis, Control, Exposure & Risk Assessment
https://www.readbyqxmd.com/read/29208267/custom-made-pei-exfoliated-mos2-nanocomposite-ultrafiltration-membranes-for-separation-of-bovine-serum-albumin-and-humic-acid
#12
Meenakshi Sundaram Sri Abirami Saraswathi, Dipak Rana, Alagumalai Nagendran, Subbiah Alwarappan
Herein, we report the effect of the exfoliated molybdenum disulfide (eMoS2) nanosheets in improving the permeability and anti-fouling properties of the PEI ultra-filtration (UF) membrane using bovine serum albumin (BSA) and humic acid (HA) as model fouling agents. The PEI/eMoS2 nanocomposite membranes were prepared via phase inversion method using three different eMoS2 concentrations (0.5, 1 and 2wt%) designated as PEI-0.5, PEI-1 and PEI-2, respectively. Fourier transform infra-red spectroscopy employed to probe the surface functionalities on the membranes...
February 1, 2018: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/29203416/quantitative-contributions-of-processes-by-which-polyanion-drugs-reduce-intracellular-bioavailability-and-transfection-efficiency-of-cationic-sirna-lipoplex
#13
Pharavee Jaiprasart, Bertrand Z Yeung, Ze Lu, M Guillaume Wientjes, Minjian Cui, Chien-Ming Hsieh, Sukyung Woo, Jessie L-S Au
RNA Interference (RNAi) is a potentially useful tool to correct the detrimental effects of faulty genes; several RNAi are undergoing clinical evaluation in various diseases. The present study identified the relative contributions of three mechanisms by which polyanion drugs reduced the gene silencing activity of Lipoplex, a complex of small interfering RNA (siRNA) and cationic liposomes. The study used a siRNA against the chemoresistance gene survivin and two model polyanion drugs (suramin, heparin). Products of Lipoplex destabilization were separated, identified, and/or quantified using ultrafiltration, gel electrophoresis, and RT-qPCR (quantitative reverse transcription polymerase chain reaction)...
December 1, 2017: Journal of Controlled Release: Official Journal of the Controlled Release Society
https://www.readbyqxmd.com/read/29202831/heterologous-expression-purification-and-function-of-the-extracellular-domain-of-human-rank
#14
Yilei Wei, Yu Zhan, Pengfei Chen, Zhi Liu, Haohao Zhang, Dandan Liu, Jie Zhang, Min Yu, Wei Mo, Jun Zhang, Xiaoren Zhang
BACKGROUND: Receptor activator of NF-κB ligand (RANKL)/RANK signaling essentially functions within the skeletal system, particularly participating in osteoclastogenesis and bone resorption. In addition, this signaling pathway has also been shown to influence tumor progression as well as the development and function of the immune system. Therefore, blocking the interaction between RANKL and RANK is a new therapeutic approach to prevent bone-related diseases and cancer. RESULTS: The coding sequence encoding the extracellular domain of human RANK (RANK-N) was codon optimized for Pichia pastoris and cloned into the pPIC9K vector, and the recombinant plasmid was then transformed into P...
December 4, 2017: BMC Biotechnology
https://www.readbyqxmd.com/read/29197818/application-of-volume-retarded-osmosis-and-low-pressure-membrane-hybrid-process-for-water-reclamation
#15
Sung-Ju Im, Jungwon Choi, Jung-Gil Lee, Sanghyun Jeong, Am Jang
A new concept of volume-retarded osmosis and low-pressure membrane (VRO-LPM) hybrid process was developed and evaluated for the first time in this study. Commercially available forward osmosis (FO) and ultrafiltration (UF) membranes were employed in a VRO-LPM hybrid process to overcome energy limitations of draw solution (DS) regeneration and production of permeate in the FO process. To evaluate its feasibility as a water reclamation process, and to optimize the operational conditions, cross-flow FO and dead-end mode UF processes were individually evaluated...
November 15, 2017: Chemosphere
https://www.readbyqxmd.com/read/29197755/occurrence-removal-and-risk-of-organic-micropollutants-in-wastewater-treatment-plants-across-china-comparison-of-wastewater-treatment-processes
#16
Weiwei Ben, Bing Zhu, Xiangjuan Yuan, Yu Zhang, Min Yang, Zhimin Qiang
This study investigated the occurrence, removal and risk of 42 organic micropollutants (MPs), including 30 pharmaceuticals and personal care products and 12 endocrine disrupting chemicals, in 14 municipal wastewater treatment plants (WWTPs) distributed across China. The composition profiles of different MP categories in the influent, effluent, and excess sludge were explored and the aqueous removal efficiencies of MPs were determined. Quantitative meta-analysis was performed to compare the efficacies of different wastewater treatment processes in eliminating MPs...
November 30, 2017: Water Research
https://www.readbyqxmd.com/read/29197156/identification-of-aggregates-in-therapeutic-formulations-of-recombinant-full-length-factor-viii-products-by-sedimentation-velocity-analytical-ultracentrifugation
#17
J F Healey, E T Parker, P Lollar
BACKGROUND: The development of inhibitory anti-factor VIII (fVIII) antibodies is the most serious complication in the management of patients with hemophilia A. Studies have suggested that recombinant full-length fVIII is more immunogenic than plasma-derived fVIII and that among recombinant fVIII products, Kogenate is more immunogenic than Advate. Aggregates in biopharmaceutical products are considered a risk factor for the development of anti-drug antibodies. OBJECTIVE: To evaluate recombinant full-length fVIII products for the presence of aggregates...
December 2, 2017: Journal of Thrombosis and Haemostasis: JTH
https://www.readbyqxmd.com/read/29196997/methods-to-enrich-exosomes-from-conditioned-media-and-biological-fluids
#18
Shayna Sharma, Katherin Scholz-Romero, Gregory E Rice, Carlos Salomon
Exosomes are nano-vesicles which can transport a range of molecules including but not limited to proteins and miRNA. This ability of exosomes renders them useful in cellular communication often resulting in biological changes. They have several functions in facilitating normal biological processes such as immune responses and an involvement in pregnancy. However, they have also been linked to pathological conditions including cancer and pregnancy complications such as preeclampsia. An understanding for the role of exosomes in preeclampsia is based on the ability to purify and characterize exosomes...
2018: Methods in Molecular Biology
https://www.readbyqxmd.com/read/29195986/comparison-of-non-volatile-umami-components-in-chicken-soup-and-chicken-enzymatic-hydrolysate
#19
Yan Kong, Xiao Yang, Qi Ding, Yu-Yu Zhang, Bao-Guo Sun, Hai-Tao Chen, Ying Sun
Umami taste is an important part to the taste of chicken. To isolate and identify non-volatile umami compounds, fractions from chicken soup and hydrolysate were prepared and analyzed. Amino acids were analyzed by amino acid analyzer. Organic acids and nucleotides were determined by ultra-performance liquid chromatography. Separation procedures utilizing ultrafiltration, Sephadex G-15 and reversed-phase high-performance liquid chromatography were used to isolate umami taste peptides. Combined with sensory evaluation and LC-Q-TOF-MS, the amino acid sequences of 12 oligopeptides were determined...
December 2017: Food Research International
https://www.readbyqxmd.com/read/29195966/thermal-stability-of-reconstituted-milk-protein-concentrates-effect-of-partial-calcium-depletion-during-membrane-filtration
#20
H Eshpari, R Jimenez-Flores, P S Tong, M Corredig
Milk protein concentrate (MPC) powders are increasingly utilized in manufacturing of protein fortified beverages. Thermal stability of the protein dispersions is of significant importance in such applications. It is known that a decrease in pH can induce partial dissociation of casein micelles and modify the natural equilibrium of calcium and phosphate between the micelles and the serum phase. The presence of soluble casein may improve the rehydration properties of MPC powders, and may impact their thermal stability...
December 2017: Food Research International
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