Influence of Surface Zeta Potential on Adhesion of Chlorella sp. to Substratum Surfaces

2013 ◽  
Vol 690-693 ◽  
pp. 1431-1434
Author(s):  
Xin Ru Zhang ◽  
Ze Yi Jiang ◽  
Hao Yuan ◽  
Yuan Xiang Lu ◽  
Liang Chen ◽  
...  
Keyword(s):  
Zeta Potential ◽  
Cell Surface ◽  
Mass Culture ◽  
Chlorella Sp ◽  
Microalgae Mass Culture ◽  
Negative Zeta Potential

Microalgae, in wet conditions, tend to grow on surfaces and form biofilms. The adhesion of microalgae to surfaces is very important for algal mass culture. The formation and development of microalgal biofims are in large denpend on the properties of cell surface, substratum surface and gowth medium. In this paper, the influence of substratum surface zeta potential on the microalgal biofilms was particularly investigated. We focused on a widely-used microalgal strain, the freshwater autotrophicChlorella sp..The adhesion phenomena ofChlorella sp.to surfaces with different zeta potential were observed microscopically. It was found thatChlorella sp.adhered easily to the surface with a positive zeta potential and difficultly to the surface with a negative zeta potential. We concluded that the surface zeta potential had a greater influence on the adhesion of microalgal cells to substratum surfaces. Our findings have important implications for microalgae mass culture and harvesting.

Enhanced growth and matrix production by human osteoblastic cells cultured on biomaterials with negative zeta potential

Bone ◽  
2009 ◽  
Vol 44 ◽  
pp. S259 ◽  
Author(s):  
J.P. Dillon ◽  
P.J.M. Wilson ◽  
W.D. Fraser ◽  
B.K. Mwaura ◽  
M.J. Hayton ◽  
...  
Keyword(s):  
Zeta Potential ◽  
Osteoblastic Cells ◽  
Matrix Production ◽  
Human Osteoblastic Cells ◽  
Negative Zeta Potential ◽  
Cells Cultured

Effect of Different Anions on 22Na Permeability of Liposomes

1973 ◽  
Vol 51 (11) ◽  
pp. 779-784 ◽  
Author(s):  
M. A. Singer
Keyword(s):  
Zeta Potential ◽  
Dipole Potential ◽  
Sodium Permeability ◽  
Phosphatidylcholine Liposomes ◽  
Solution Interface ◽  
Cation Permeability ◽  
Na Efflux ◽  
Negative Zeta Potential

The 22Na efflux from phosphatidylcholine liposomes was measured in the presence of different anions. Only salicylate significantly increases sodium permeability. Although this anion adsorbs onto the liposomal surface creating a negative zeta potential, evidence is presented that this is not the sole mechanism underlying the enhanced cation permeability. It is proposed that salicylate also alters the dipole potential at the membrane–solution interface.

Bioleaching Solutions Used for the Nanoparticles Biosynthesis for Uranium and Arsenic Immobilization

2020 ◽  
Vol 304 ◽  
pp. 45-50
Author(s):  
Agnieszka Pawlowska ◽  
Zygmunt Sadowski
Keyword(s):  
Zeta Potential ◽  
Solid Waste ◽  
Green Tea ◽  
Camellia Sinensis ◽  
Plant Extract ◽  
Uranium Dioxide ◽  
Electrical Potential ◽  
Nanoparticle Synthesis ◽  
Negative Zeta Potential

Bioleaching solutions from uranium and arsenic solid waste served as a source of U(VI) and As (V) ions, while plant extract from green tea (Camellia sinensis) – as a reductor for nanoparticle synthesis. Uranium dioxide and As (III) nanoparticles were formed as a product of bioreduction on the hematite and schwertmannite surfaces respectively, which resulted in an increase in the negative zeta potential with an increase in pH. It suggests, that the electrical potential depends on the presence of nanoparticles. The SEM microphotographs revealed the UO2 nanoparticles on the hematite surface.

Tumor Targeting of Plasmid DNA by Dextran Conjugation Based on Metal Coordination

2005 ◽  
Vol 288-289 ◽  
pp. 109-112
Author(s):  
H. Hosseinkhani ◽  
T. Aoyama ◽  
O. Ogawa ◽  
Yasuhiko Tabata
Keyword(s):  
Gene Expression ◽  
Zeta Potential ◽  
Plasmid Dna ◽  
Tumor Targeting ◽  
Metal Coordination ◽  
Hydroxyl Groups ◽  
Negative Zeta Potential

Tumor targeting of plasmid DNA was achieved through the conjugation of dextran derivative with chelate residue based on metal coordination. Spermine (Sm) was chemically introduced to the hydroxyl groups of dextran to obtain dextran-Sm derivative. A negative zeta potential of plasmid DNA became almost 0 mV by the Zn2+-coordinated conjugation with the dextran-Sm When the dextran-Sm-plasmid DNA conjugate with Zn2+ coordination was intravenously injected to mice subcutaneously bearing Meth-AR-1 fibrosarcoma, the dextran- Sm-plasmid DNA conjugate significantly enhanced the level of gene expression in the tumor, in contrast to free plasmid DNA..

scholarly journals Tuning cell surface charge in E. coli with conjugated oligoelectrolytes

2016 ◽  
Vol 7 (3) ◽  
pp. 2023-2029 ◽  
Author(s):  
Chelsea Catania ◽  
Alexander W. Thomas ◽  
Guillermo C. Bazan
Keyword(s):  
Zeta Potential ◽  
Cell Surface ◽  
Surface Charge ◽  
E Coli ◽  
Cell Surface Charge

Conjugated oligoelectrolytes intercalate into and associate with membranes, thereby changing the surface charge of microbes, as determined by zeta potential measurements.

scholarly journals In Vitro and Ex Vivo Evaluation of Nepafenac-Based Cyclodextrin Microparticles for Treatment of Eye Inflammation

Nanomaterials ◽  
2020 ◽  
Vol 10 (4) ◽  
pp. 709 ◽  
Author(s):  
Blanca Lorenzo-Veiga ◽  
Patricia Diaz-Rodriguez ◽  
Carmen Alvarez-Lorenzo ◽  
Thorsteinn Loftsson ◽  
Hakon Hrafn Sigurdsson
Keyword(s):  
Zeta Potential ◽  
Physicochemical Properties ◽  
Inflammatory Mediators ◽  
Ex Vivo ◽  
Posterior Segment ◽  
Inflammatory Activity ◽  
Commercial Formulation ◽  
Anti Inflammatory ◽  
Negative Zeta Potential

The aim of this study was to design and evaluate novel cyclodextrin (CD)-based aggregate formulations to efficiently deliver nepafenac topically to the eye structure, to treat inflammation and increase nepafenac levels in the posterior segment, thus attenuating the response of inflammatory mediators. The physicochemical properties of nine aggregate formulations containing nepafenac/γ-CD/hydroxypropyl-β (HPβ)-CD complexes as well as their rheological properties, mucoadhesion, ocular irritancy, corneal and scleral permeability, and anti-inflammatory activity were investigated in detail. The results were compared with a commercially available nepafenac suspension, Nevanac® 3 mg/mL. All formulations showed microparticles, neutral pH, and negative zeta potential (–6 to –27 mV). They were non-irritating and nontoxic and showed high permeation through bovine sclera. Formulations containing carboxymethyl cellulose (CMC) showed greater anti-inflammatory activity, even higher than the commercial formulation, Nevanac® 0.3%. The optimized formulations represent an opportunity for topical instillation of drugs to the posterior segment of the eye.

Salmonella Sofia Differs from Other Poultry-Associated Salmonella Serovars with Respect to Cell Surface Hydrophobicity

2008 ◽  
Vol 71 (12) ◽  
pp. 2421-2428 ◽  
Author(s):  
T. W. R. CHIA ◽  
N. FEGAN ◽  
T. A. McMEEKIN ◽  
G. A. DYKES
Keyword(s):  
Zeta Potential ◽  
Cell Surface ◽  
Physicochemical Properties ◽  
Surface Charge ◽  
Hydrophobic Interaction ◽  
Salmonella Enterica ◽  
Food System ◽  
Cell Surface Hydrophobicity ◽  
Bacterial Attachment ◽  
Salmonella Serovars

Salmonella enterica is one of the most important foodborne pathogens. Salmonella enterica subsp. II 4,12:b:– (Salmonella Sofia) is commonly found in Australian poultry. It has been suggested that physicochemical properties such as surface charge and hydrophobicity may affect bacterial attachment to surfaces and their ability to persist in food systems. A possible link between hydrophobicity cell surface charge and persistence of Salmonella from the poultry system was examined. Hydrophobicity of Salmonella Sofia (n = 14), Salmonella Typhimurium (n = 6), Salmonella Infantis (n = 3), and Salmonella Virchow (n = 2) was assayed using hydrophobic interaction chromatography, bacterial adherence to hydrocarbons (BATH), using xylene or hexadecane, and the contact angle method (CAM). Cellular surface charge (CSC) of the isolates was determined using zeta potential measurements. The majority (12 of 14) of Salmonella Sofia isolates were found to be hydrophobic when assayed using BATH with xylene, except isolates S1635 and S1636, and the other serovars were found to be hydrophilic. Salmonella Sofia isolates were not significantly different (P > 0.05) from isolates of other serovars as measured by hydrophobic interaction, BATH with hexadecane, or the CAM. No significant differences (P > 0.05) in zeta potential measurements were observed between isolates. Principal component analysis using results from all four measures of hydrophobicity allowed clear differentiation between isolates of the serovar Salmonella Sofia (except S1635 and S1636) and those of other Salmonella serovars. Differences in physicochemical properties may be a contributing factor to the Salmonella Sofia serovar's ability to attach to surfaces and persist in a food system.

scholarly journals Design of dispersant for highly concentrated one-dimensional Nb2Se9 inorganic molecular chains from bulk crystal

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Sudong Chae ◽  
Akhtar J. Siddiqa ◽  
Seungbae Oh ◽  
Bum Jun Kim ◽  
Kyung Hwan Choi ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Zeta Potential ◽  
Steric Hindrance ◽  
Bulk Crystal ◽  
One Dimensional ◽  
1D Chain ◽  
A Charge ◽  
Negative Zeta Potential ◽  
Octadecyl Amine

Abstract We determined the optimum dispersant to separate bulk Nb2Se9 material into 1D chain units. The Nb2Se9, which had a negative zeta potential (−43.3 mV), showed acidic characteristics and strongly bonded with the amine head of octadecyl amine through a charge transfer (from the amine to Se atoms) reaction. The steric hindrance of the octadecyl tail resulted in excellent dispersion of Nb2Se9 (down to nanometre-sized mono-chains).

Use of Malonic Acid in Chemical-Mechanical Polishing ( CMP ) of Tungsten

1997 ◽  
Vol 477 ◽  
Author(s):  
L. Zhang ◽  
S. Raghavan
Keyword(s):  
Zeta Potential ◽  
Malonic Acid ◽  
Chemical Mechanical Polishing ◽  
Mechanical Polishing ◽  
Small Scale ◽  
Ph Values ◽  
Particulate Contamination ◽  
Principal Objective ◽  
Alumina Particles ◽  
Negative Zeta Potential

ABSTRACTThe use of malonic acid as an additive in alumina slurries used for the chemical mechanical polishing ( CMP ) of tungsten has been explored for the reduction of particulate contamination. The principal objective of this work was to delineate conditions under which alumina contamination on polished surfaces could be reduced.The interaction between malonic acid and alumina particles has been investigated through electrokinetic and adsorption measurements. At suitable malonic acid concentrations and pH values, tungsten and alumina surfaces develop a negative zeta potential resulting in conditions conducive to reduced particulate contamination. Small scale polishing experiments have been carried out to relate electrokinetic results to the level of particulate contamination after polishing.

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