Biosorption of Bacillus Circulans and Bacillus Mucilaginosus on the Surface of Diaspore , Kaolinite and Quartz

2011 ◽  
Vol 393-395 ◽  
pp. 628-631
Author(s):  
De Si Sun ◽  
Hong Bao ◽  
Hao Chen ◽  
Xian Zhen Zhang ◽  
Ji Han Nie
Keyword(s):  
Cell Concentration ◽  
Experimental Results ◽  
Bacillus Circulans ◽  
Bacillus Mucilaginosus ◽  
Silicate Minerals ◽  
Silicate Bacteria ◽  
Adsorption Amount

The effects of biosorption time and cell concentration on adsorption amount on the surface of diaspore, kaolinite and quartz were studied by using two kinds of silicate bacteria ____Bacillus circulans and Bacillus mucilaginosus, and three kinds of silicate minerals . the experimental results show that two kinds of silicate bacteria absorb more easily on the surface of diaspore than on that of kaolinite and quartz, and the adsorption amount of the strain of B•M is always higher than that of the strain of B•C on the surface of diaspore, kaolinite and quartz .The possible reason is that the pHPZC of diaspore is higher than that of kaolinite and quartz, and the strain of B•M probably produce more metabolites charged negatively than that of B•C in incubation process.

Influence of Sol Compositions on Boron Adsorption by Boron-Selective Hybrid Gels

2011 ◽  
Vol 233-235 ◽  
pp. 2674-2677 ◽  
Author(s):  
Hai Ning Liu ◽  
Xiu Shen Ye ◽  
Hui Fang Zhang ◽  
Zhi Jian Wu
Keyword(s):  
Mechanical Strength ◽  
Adsorption Capacity ◽  
Experimental Results ◽  
Hybrid Gels ◽  
Commercial Resin ◽  
Adsorption Amount ◽  
Chelating Groups ◽  
Boron Adsorption

Hybrid gels with boron-chelating groups were prepared using bis(trimethoxysilylpropyl)amine (TSPA) and the precursors synthesized from (3-glycidoxypropyl)trimethoxysilane (GPTMS) and N-methylglucamine (MG). Boron adsorption by the hybrid gels and a commercial boron-selective resin D564 were compared. The experimental results demonstrated that sol compositions have a great effect on the boron adsorption by the hybrid gels. Changing the sol compositions is a convenient way to adjust the adsorption capacity of the hybrid gels. The highest boron adsorption amount of the hybrid gels was found to be 1.54 mmol g-1, higher than that of the commercial resin D564 (1.39 mmol g-1). The hybrid gels reported in this study are easy to prepare, having a higher adsorption capacity and a good mechanical strength.

scholarly journals Fermentation alcoolique : observations cinétiques

OENO One ◽  
1979 ◽  
Vol 13 (4) ◽  
pp. 281
Author(s):  
Pierre Strehaiano ◽  
Marc Moreno ◽  
Gérard Goma
Keyword(s):  
Ethanol Production ◽  
Cell Density ◽  
Alcoholic Fermentation ◽  
Initial Level ◽  
Cell Concentration ◽  
Experimental Results ◽  
Initial Concentration ◽  
Mise En Œuvre ◽  
Cette Observation ◽  
Nous Montrons

<p style="text-align: justify;">Dans un premier temps, les concepts cinétiques nécessaires à la compréhension et à la mise en œuvre de la fermentation alcoolique sont discutés.</p><p style="text-align: justify;">Dans un deuxième temps, à la lumière des résultats expérimentaux, nous montrons l'influence de la concentration initiale en sucre (glucose) sur les rendements en biomasse et en éthanol, sur la densité cellulaire et la vitesse moyenne de production d'éthanol. La concentration cellulaire est relativement faible (1,5 à 3 gl<sup>-1</sup>) et ce, quelle que soit la concentration initiale en substrat.</p><p style="text-align: justify;">Après avoir discuté cette observation, nous montrons qu'il n'existe pas de phase exponentielle de croissance et que, lorsque la concentration initiale en sucre augmente, la fraction de temps de fermentation qui s'effectue à un taux de croissance supérieur à 10<sup>-2</sup> µm diminue très sensiblement.</p><p style="text-align: justify;">+++</p><p style="text-align: justify;">In that work, kinetic concepts concerning understanding and process of alcoholic fermentation are discussed. Refering to experimental results, it is shown that yield of biomass and of ethanol, cell density and mean speed of ethanol production are in connection with the initial level of glucose. Cell concentration is relatively low without any correlation with the initial concentration of substrate.</p><p style="text-align: justify;">It is shown that exponential growing phase does not exist; when increases the initial level of glucose decreases strongly the time of fermentation occuring with a level growing higher than 10<sup>-2</sup> µm.</p>

Fast Degradation of Chlorpyrifos in Soil by Strain Cupriavidus taiwanensis X1 Labeled with LuxAB

2011 ◽  
Vol 356-360 ◽  
pp. 2566-2570 ◽  
Author(s):  
Bei Bei Zhu ◽  
Dao Sheng Wang ◽  
Yuan Yuan Cao ◽  
Xin Yun Tang ◽  
Ri Mao Hua ◽  
...  
Keyword(s):  
Reporter Gene ◽  
Genetic Stability ◽  
Cell Concentration ◽  
Experimental Results ◽  
Minimal Salt Medium ◽  
Salt Medium ◽  
Soil Strain ◽  
Hydrolysis Activity

For researching ecological behaviors of Cupriavidus taiwanensis X1 which has strong hydrolysis activity on chlorpyrifos(CP), reporter gene luxAB was successfully introduced into cells by electroporation. The labeled strain X1-lux with genetic stability and fluorescence was obtained. Both of strain X1 and X1-lux could completely degrade 200 mg/l CP within 12h in minimal salt medium, and experimental results showed that introduction of luxAB did not affect strain X1 growth and degradation on CP. The cells of X1-lux and X1 were inoculated into soil with 500 mg/l CP, the cell concentration and CP residual was detected, and data revealed that strain X1 could absolutely removed CP in 12d and survive in soil. Strain X1 is a potential excellent choice for bioremediation of organophosphorus polluted environments.

Effect of Pair-Mineralizer on the Reaction of Alite and Calcium Langbeinite Formation

2006 ◽  
Vol 510-511 ◽  
pp. 622-625
Author(s):  
Woo Teck Kwon ◽  
Young Phil Kim ◽  
Y. Kim ◽  
Soo Ryong Kim ◽  
Seong Youl Bae
Keyword(s):  
Powder Diffraction ◽  
Calcium Silicate ◽  
Mineralogical Composition ◽  
Experimental Results ◽  
Silicate Minerals ◽  
X Ray

This paper investigates the effect of the pair-minerializer (CaSO4,-CaF2) on the reaction of alite, belite and calcium langbeinite formation with different alkali and sulfate contents. A set of clinker samples was prepared by adding laboratory grade reagents of (NH4)2SO4, CaF2 and K2CO3 to the cement raw mixes. The mineralogical composition of clinker was analyzed by X-ray powder diffraction, and the quantity of minerals was evaluated by using TOPAS software. As the experimental results, the total amount of calcium silicate minerals was rapidly increased with the addition of F and SO3 components simultaneously as pair-mineralizer with K2O more than the value which mineralizer was added separately. Also, in the case of adding K2O only to the raw mixes, the amount of alite is decreased after clinkering. However, if alkali (K2O) and pair-minerializer (CaSO4,-CaF2) were added simultaneously, the quantity of alite and calcium langbeinite mineral increased because of the formation of stable clinker minerals by the reaction of alkali (K2O) and sulfate.

III. The electrical conductivity of the Moon - The electrical conductivity of the Moon’s interior

1967 ◽  
Vol 296 (1446) ◽  
pp. 320-329 ◽  
Keyword(s):  
Electrical Conductivity ◽  
Temperature Distribution ◽  
Lower Mantle ◽  
Experimental Results ◽  
The Moon ◽  
Rapid Rise ◽  
Geomagnetic Variations ◽  
Silicate Minerals ◽  
Earth’S Mantle

Analysis of the geomagnetic variations shows that in the Earth’s mantle at a depth of 700 km there is a rapid rise of electrical conductivity. Other considerations show that this rise flattens off in the lower mantle. The phenomenon is well explained by the semi-conduction of the silicate minerals. Experimental results on the electrical conductivity of olivine with tempera­ture and pressures up to those of the Moon’s centre will be described. Different models of the temperature distribution yield widely varying conductivity distributions.

Wavelengths of bioconvection patterns

1997 ◽  
Vol 200 (10) ◽  
pp. 1515-1526 ◽  
Author(s):  
M Bees ◽  
N Hill
Keyword(s):  
Thermal Convection ◽  
Cell Concentration ◽  
Experimental Results ◽  
Collective Behaviour ◽  
Micro Organisms

Bioconvection occurs as the result of the collective behaviour of many micro-organisms swimming in a fluid and is realised as patterns similar to those of thermal convection which occur when a layer of water is heated from below. A methodology is developed to record the bioconvection patterns that are formed by aqueous cultures of the single-celled alga Chlamydomonas nivalis. The analysis that is used to quantify the patterns as a function of cell concentration, suspension depth and time is described and experimental results are presented.

scholarly journals Decomposition of silicate minerals by Bacillus mucilaginosus in liquid culture

2006 ◽  
Vol 28 (1-2) ◽  
pp. 133-140 ◽  
Author(s):  
Wuxing Liu ◽  
Xushi Xu ◽  
Xianghua Wu ◽  
Qiyin Yang ◽  
Yongming Luo ◽  
...  
Keyword(s):  
Liquid Culture ◽  
Bacillus Mucilaginosus ◽  
Silicate Minerals

scholarly journals Effects of PCE on the Dispersion of Cement Particles and Initial Hydration

Materials ◽  
2021 ◽  
Vol 14 (12) ◽  
pp. 3195
Author(s):  
Weiwei Zhu ◽  
Qingge Feng ◽  
Qi Luo ◽  
Xiukui Bai ◽  
Xianhao Lin ◽  
...  
Keyword(s):  
Zeta Potential ◽  
Film Thickness ◽  
Water Film ◽  
Experimental Results ◽  
Hydration Products ◽  
Cement Pastes ◽  
Degree Of Hydration ◽  
Water Film Thickness ◽  
Adsorption Amount

The effects of polycarboxylate superplasticizers (PCEs) on the dispersing properties and initial hydration of cement particles with various water-to-cement (w/c) ratios was investigated, including the water film thickness (WFT), rheology, fluidity, adsorption of PCEs, zeta potential, degree of hydration, hydration products. The experimental results demonstrate that the initial rheological and fluidity parameters were more sensitive to the PCE dosage at a lower w/c because the WFT and the zeta potential on cement particles change more significantly. Moreover, the higher adsorption amounts of the PCEs at a lower w/c lead to a stronger inhibition of the initial hydration, whilst, at the same PCE dosage, the cement pastes have a more rapid fluidity loss and quicker hydration reactions at a higher w/c due to a lower adsorption amount of the PCE on cement particles.

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