Physico-chemical surface characterization of Bacillus cereus spores isolated from an Algerian dairy plant

Optical changes associated with the surface coating of different metal oxides and nanolayers by the ALD technique of a nanoporous alumina structure (NPAS) obtained by the two-step anodization method were analyzed. The NPASs were coated with: (i) a single layer (SiO2 or TiO2), and (ii) a double layer of SiO2 plus Al2O3 or aluminum doped ZnO (AZO) to estimate the effect of surface layer coverage material, geometrical parameters (pore-size/porosity), and number of layers on light transmission/reflection. Chemical surface characterization of the different NPASs was carried out by analyzing XPS spectra, which allowed us to obtain an estimation of the coating layer homogeneity. Transmittance and spectroscopic ellipsometry measurements were analyzed in order to detect changes in characteristic optical parameters such as band gap, refractive index, and extinction coefficients associated with the material and the characteristics of the single or double coating layers.

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Surface Characterization of Polymers by Physico-Chemical Measurements

The Journal of Adhesion ◽

10.1080/00218469508028154 ◽

1995 ◽

Vol 48 (1-4) ◽

pp. 57-73 ◽

Cited By ~ 29

Author(s):

H. J. Jacobasch ◽

K. Grundke ◽

S. Schneider ◽

F. Simon

Keyword(s):

Surface Characterization ◽

Chemical Measurements ◽

Physico Chemical

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Chemical Surface Characterization of Activated Carbons by Adsorption Excess of Probe Molecules

Chemical Engineering & Technology ◽

10.1002/ceat.201500571 ◽

2016 ◽

Vol 39 (6) ◽

pp. 1144-1150 ◽

Cited By ~ 6

Author(s):

Julian Treese ◽

Christoph Pasel ◽

Michael Luckas ◽

Dieter Bathen

Keyword(s):

Surface Characterization ◽

Activated Carbons ◽

Probe Molecules ◽

Chemical Surface

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Microscopical and chemical surface characterization of the gingival portion and connection of an internal hexagon abutment before and after different technical stages of preparation

Clinical Oral Implants Research ◽

10.1111/j.1600-0501.2012.02499.x ◽

2012 ◽

Vol 24 (6) ◽

pp. 606-611 ◽

Cited By ~ 10

Author(s):

Luigi Canullo ◽

Costanza Micarelli ◽

Giuliano Iannello

Keyword(s):

Surface Characterization ◽

Chemical Surface ◽

Before And After

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Characterization of an algae-lytic substance secreted by Bacillus cereus, an indigenous bacterial isolate from Lake Kasumigaura

Water Science & Technology ◽

10.2166/wst.2002.0747 ◽

2002 ◽

Vol 46 (11-12) ◽

pp. 257-262 ◽

Cited By ~ 6

Author(s):

N. Nakamura ◽

K. Nakano ◽

N. Sugiura ◽

M. Matsumura

Keyword(s):

Bacillus Cereus ◽

Carbon Number ◽

Lytic Activity ◽

Water Bloom ◽

Lake Kasumigaura ◽

Physico Chemical ◽

Alkaline Conditions ◽

Chemical Factors ◽

Lytic Bacteria

In order to develop a practical biological strategy for water bloom-control in Lake Kasumigaura, indigenous algae-lytic bacteria targeting Microcystis spp. (the dominant cyanobacteria), was first carried out. Some basic lytic characteristics of the isolates concerning the biological and physico-chemical factors in actual water environments were then investigated. Fifteen algae-lytic bacteria were successfully isolated using the double layer method. The isolate showing the highest lytic activity was identified as Bacillus cereus based on the 16SrRNA sequence. Extracellular products of B. cereus were found to be responsible for algae-lytic activity. Algae-lytic assay tests using bacterial supernatants pre-treated under several conditions indicated that the majority of the effective algae-lytic substances were either hydrophilis or hydrophobics with a carbon number less than 18, and with molecular weight less than 2000 Da. The algae-lytic activity of the bacterial supernatant was found to be enhanced under alkaline conditions, but it was lost under acidic conditions. This pH specific characteristic is advantageous for application in water bloom environments where the pH is usually in the alkaline region.

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