the term 'membrane bioreactor' expresses a combination of activated sludge and membrane separation processes. the need to processes like sedimentation and disinfection used in common methods is eliminated through mbr systems in a way that membranes are placed into or out of an aeration tank and the vacuumed wastewater created by the suction pump is pulled up from inside the membranes and leaves...

purpose: to evaluate the use of amniotic membrane transplantation (amt) for management of congenital distichiasis. methods: this interventional case series was performed on 16 eyelids of 5 patients with congenital distichiasis treated with posterior lamella resection and amt. results: all patients were men aged 2 to 42 years. mean follow up was 17 months (6-29 months). post-operative symptoms o...

terms and conditions of current drinking water quality standards, including reducing the maximum arsenic concentration from 50 μgl-1 to 10 μgl-1 and predicted stricter standards in future, reveals the necessity for development of new technologies. this study aimed to prepare and evaluate a new nanocomposite membrane using graphene oxide (go) thin layer to remove arsenic (v) from water. to fabri...

the separation of olefin/paraffin mixtures is an important process in petrochemical industries, which is traditionally performed by low temperature distillation with a high-energy consumption, or complex extractive distillationand adsorption techniques. membrane separation process is emerging as an alternative for traditional separation processes with respect to low energy and simple operation....

Carbon membrane can be produced using a wide variety of polymer precursor materials via heat treatment process. A general concept route of precursor selection-preparation-modification-performance analysis platform for the carbon membrane has been proposed to promote the development of carbon membrane material for a wide range of application. The current review considers the recent progress of c...

reconstruction methods are an essential prerequisite for functional rehabilitation of the stomatognathic system. plasma rich in growth factors (prgf) offers a new and potentially useful adjunct to bone substitute materials in bone reconstructive surgery. this study was carried out to investigate the influence of prgf and fibrin membrane on regeneration of bony defects with and without deprotein...

dppc (dipalmitoylphosphatidylcholine) and dmpc (dimyristoylphosphatidylcholine) are taken asphospholipids with an equal polar heads and with the difference in the length of hydrocarbonchains. results obtain from the structural optimization of the isolated dppc and dmpc in the gasphase, at the hartree-fock level of theory by means of sto-3g,3-21g, 6-31g and 6-31g* basissets. the most important d...

Membrane contactor using amine based absorbents is an efficient technology for CO2 separation from gaseous mixtures. A novel porous polysulfone (PSF) flat membrane was prepared via non-solvent phase inversion method. The PSF membrane was modified by adding polyvinyl pyrrolidone (PVP) to the dope solution. The fabricated membrane was used in the serpentine flow field contactor module for CO2 abs...

For spectrophotometric analysis of Hg (II) ions, we have used and compared two membranes preparation methods using different polymer; one is poly(vinyl chloride) (PVC) and the other is triacetylcellulose (TAC). In the case of TAC membrane, it was treated with a ligand solution (1.166 × 10-3 mole L-1) in ethylenediamine at the ambient temperature for almost 2-5 min. However, in the case of PVC m...

purpose: to introduce the technique and results of vitrectomy surgery with removal of cyclitic membrane by placement of radial cuts over the membrane in traumatized eyes. methods: vitrectomy in 8 eyes of 8 patients after penetrating ocular trauma revealed that fibrovascular tissue was present over the pars plicata. to remove the membrane, radial cuts were placed over the membrane first and then...