نتایج جستجو برای: polymer viscosity

تعداد نتایج: 125524  

Journal: :iranian journal of pharmaceutical sciences 0
maryam maghsoodi school of pharmacy, tabriz university of medical sciences, tabriz 51664, iran ali nokhodchi school of pharmacy, tabriz university of medical sciences, tabriz 51664, iran medway school of pharmacy, the universities of kent and greenwich central ave., me4 tb, kent, uk leila barghia school of pharmacy, tabriz university of medical sciences, tabriz 51664, iran

controlled release swellable tablets of phenobarbital were prepared by a simple direct compression process using hydroxypropyl methylcellulose (hpmc) as the matrix former. the effects of the viscosity grades of hpmc and hpmc/lactose ratio and ethylcellulose (ec)/sodium carboxymethylcellulose (nacmc) and their concentrations on the release behavior of phenobarbital from hpmc matrices were invest...

Journal: :Physical review. E, Statistical, nonlinear, and soft matter physics 2013
Hendrick W de Haan Gary W Slater

The translocation of a polymer through a pore in a membrane separating fluids of different viscosities is studied via several computational approaches. Starting with the polymer halfway, we find that as a viscosity difference across the pore is introduced, translocation will predominately occur towards one side of the membrane. These results suggest an intrinsic pumping mechanism for translocat...

Journal: :Journal of biomaterials science. Polymer edition 1997
N Wang X S Wu C Li M F Feng

A series of lactic/glycolic acid polymers with various molar ratios of lactic to glycolic acid and various molecular weights were synthesized using the ring-opening polymerization method. The polymerization conditions for the lactic/glycolic acid polymer synthesis were as follows: 150 degrees C, 700 microm Hg, 3 h, 0.03 wt% of catalyst (stannous 2-ethyl-hexanoate) concentration. The molecular w...

Afsaneh Mohammadi Fatemah Atyabi, Rassoul Dinarvand

        The purpose of this study was to prepare and characterize nimodipine loaded microspheres using ethyl cellulose (EC) as a carrier polymer through an emulsion solvent evaporation method. These evaluations characterized the pattern of drug release from prepared microspheres. Nimodipin loaded microspheres were prepared using an emulsification solvent evaporation method. The effect of proces...

Journal: :Applied and environmental microbiology 1985
E A Bodie R D Schwartz A Catena

An Arthrobacter sp. isolated from a glucose-sucrose agar plate was found to produce a neutral, extremely viscous, opalescent extracellular polymer. Growth, polymer production, and rheological properties and chemical composition of the isolated polymer were examined. The polymer was found to be substantially different from other arthrobacter polymers. Some unusual properties included irreversibl...

Journal: :Molecules 2009
Anna Körner Lennart Piculell Frida Iselau Bengt Wittgren Anette Larsson

The effect of three different types of polymer chain structures on the polymer release from hydrophilic matrix tablets was investigated by comparing a synthetic semi-crystalline linear polymer (PEO), a branched amorphous polysaccharide (dextran) and an amorphous substituted cellulose derivative (HPMC). The polymer release rates for tablets containing mixtures of high and low molecular weight gr...

ژورنال: طب جنوب 2019
Azin , Reza, Najafiasl , Maryam, Osfouri , Shahriyar, Zaeri , Sasan,

Background: Nowadays, in order to preserve the environment and sustainable development, the use of natural and renewable resources is a priority for industries. High performance and specific structure of nano-biocompatible materials has attracted researchers. In this research, alginate polymer, which is generally obtained from marine sources such as algae, was added to polyvinyl alcohol nanofi...

2002
David Erickson Fuzhi Lu Dongqing Li Tony White Jason Gao

In many lubrication processes, lubricating oils containing polymer additives are subject to high shear rate through very small clearance channels. While the influence of shear rate on the performance of these lubricants has been well examined, very little is known about the effects of channel size. In this study a specially designed microchannel viscometer has been used to experimentally charac...

Journal: :Langmuir : the ACS journal of surfaces and colloids 2010
Rakesh Kumar Srinivasa R Raghavan

Telechelic associating polymers (hydrophilic ethoxylated backbone, hydrophobic n-alkyl end-groups) form viscous solutions in water due to associations between the hydrophobes. The addition of alpha-, beta-, or gamma-cyclodextrin (CD) substantially reduces the solution viscosity because the CD molecules envelop and sequester the hydrophobes in their hydrophobic cavities. The present paper explor...

2013
Takashi Ohgita Naoki Hayashi Naomasa Gotoh Kentaro Kogure

Bacteria secrete effector proteins required for successful infection and expression of toxicity into host cells. The type III secretion apparatus is involved in these processes. Previously, we showed that the viscous polymer polyethylene glycol (PEG) 8000 suppressed effector secretion by Pseudomonas aeruginosa. We thus considered that other viscous polymers might also suppress secretion. We ini...

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