Sunflower stem: a novel and economical scavenger for Hg(II) ions from aqueous solutions and its kinetic and thermodynamic investigation

2006 ◽  
Vol 94 (3) ◽  
Author(s):  
Ummat Rasul Malik ◽  
Syed Moosa Hasany ◽  
Muhammad Sadiq Subhani
Keyword(s):  
Aqueous Solutions ◽  
Thermodynamic Investigation

SummaryThe sorption of > 93% of Hg(II) ions is achieved onto sunflower stem (50 mg/4.5 cm

Removal of uranium(VI) from aqueous solutions by magnetic Schiff base: Kinetic and thermodynamic investigation

2012 ◽  
Vol 198-199 ◽  
pp. 412-419 ◽  
Author(s):  
Xiaofei Zhang ◽  
Caishan Jiao ◽  
Jun Wang ◽  
Qi Liu ◽  
Rumin Li ◽  
...  
Keyword(s):  
Schiff Base ◽  
Aqueous Solutions ◽  
Thermodynamic Investigation

Kinetics and Thermodynamic Investigation of Phosphate Adsorption on AlCl3 Modified Palygorskite

2013 ◽  
Vol 683 ◽  
pp. 530-533
Author(s):  
Yan Zhang ◽  
Xian Jun Lv ◽  
Xiao Yan Kou
Keyword(s):  
Aqueous Solutions ◽  
Langmuir Isotherm ◽  
Goodness Of Fit ◽  
Phosphate Adsorption ◽  
Order Model ◽  
Thermodynamic Investigation ◽  
Process Kinetics ◽  
Pseudo Second Order ◽  
Modified Palygorskite ◽  
Kinetics And Thermodynamic

The potential of AlCl3 modified palygorskite was assessed for adsorption of phosphate from aqueous solutions. The Langmuir isotherm adequately described adsorption with an R2 goodness of fit of 0.9683. The process kinetics was found to follow the pseudo-second-order model. Positive △H and △S values indicated that the adsorption of phosphate onto AlCl3 modified palygorskite was endothermic. Negative △G showed that the adsorption of phosphate onto this sorbent is feasible and spontaneous.

Ultrathin frozen sections of yeast without aldehyde prefixation

1978 ◽  
Vol 36 (2) ◽  
pp. 58-59
Author(s):  
K. J. Böhm ◽  
a. E. Unger
Keyword(s):  
Aqueous Solutions ◽  
Biological Material ◽  
Yeast Cells ◽  
Frozen Sections ◽  
Good Preservation ◽  
Ultrathin Frozen Sections

During the last years it was shown that also by means of cryo-ultra-microtomy a good preservation of substructural details of biological material was possible. However the specimen generally was prefixed in these cases with aldehydes.Preparing ultrathin frozen sections of chemically non-prefixed material commonly was linked up to considerable technical and manual expense and the results were not always satisfying. Furthermore, it seems to be impossible to carry out cytochemical investigations by means of treating sections of unfixed biological material with aqueous solutions.We therefore tried to overcome these difficulties by preparing yeast cells (S. cerevisiae) in the following manner:

Imaging polymers, proteins and dna in aqueous solutions with the atomic force microscope

1989 ◽  
Vol 47 ◽  
pp. 32-33
Author(s):  
S.A.C. Gould ◽  
B. Drake ◽  
C.B. Prater ◽  
A.L. Weisenhorn ◽  
S.M. Lindsay ◽  
...  
Keyword(s):  
Amino Acids ◽  
Dna Sequencing ◽  
Aqueous Solutions ◽  
Atomic Force Microscope ◽  
Piezoelectric Crystal ◽  
Atomic Force ◽  
Structure Of Molecules ◽  
Optical Lever

The atomic force microscope (AFM) is an instrument that can be used to image many samples of interest in biology and medicine. Images of polymerized amino acids, polyalanine and polyphenylalanine demonstrate the potential of the AFM for revealing the structure of molecules. Images of the protein fibrinogen which agree with TEM images demonstrate that the AFM can provide topographical data on larger molecules. Finally, images of DNA suggest the AFM may soon provide an easier and faster technique for DNA sequencing.The AFM consists of a microfabricated SiO2 triangular shaped cantilever with a diamond tip affixed at the elbow to act as a probe. The sample is mounted on a electronically driven piezoelectric crystal. It is then placed in contact with the tip and scanned. The topography of the surface causes minute deflections in the 100 μm long cantilever which are detected using an optical lever.

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