Influence of Small Additives of Aubasidan on Gel Formation in Aqueous Solutions of Red Seaweed Polysaccharides

1994 ◽  
pp. 197-200
Author(s):  
N. M. Ptitchkina ◽  
E. M. Karmanova ◽  
E. V. Artjuhov ◽  
A. G. Ishin
Keyword(s):  
Aqueous Solutions ◽  
Gel Formation ◽  
Red Seaweed

scholarly journals Heavy Metal Adsorption ontoKappaphycussp. from Aqueous Solutions: The Use of Error Functions for Validation of Isotherm and Kinetics Models

2015 ◽  
Vol 2015 ◽  
pp. 1-13 ◽  
Author(s):  
Md. Sayedur Rahman ◽  
Kathiresan V. Sathasivam
Keyword(s):  
Heavy Metals ◽  
Heavy Metal ◽  
Aqueous Solutions ◽  
Kinetic Models ◽  
Adsorption Process ◽  
Low Cost ◽  
Metal Adsorption ◽  
Red Seaweed ◽  
Error Functions ◽  
Removal Of Heavy Metals

Biosorption process is a promising technology for the removal of heavy metals from industrial wastes and effluents using low-cost and effective biosorbents. In the present study, adsorption of Pb2+, Cu2+, Fe2+, and Zn2+onto dried biomass of red seaweedKappaphycussp. was investigated as a function of pH, contact time, initial metal ion concentration, and temperature. The experimental data were evaluated by four isotherm models (Langmuir, Freundlich, Temkin, and Dubinin-Radushkevich) and four kinetic models (pseudo-first-order, pseudo-second-order, Elovich, and intraparticle diffusion models). The adsorption process was feasible, spontaneous, and endothermic in nature. Functional groups in the biomass involved in metal adsorption process were revealed as carboxylic and sulfonic acids and sulfonate by Fourier transform infrared analysis. A total of nine error functions were applied to validate the models. We strongly suggest the analysis of error functions for validating adsorption isotherm and kinetic models using linear methods. The present work shows that the red seaweedKappaphycussp. can be used as a potentially low-cost biosorbent for the removal of heavy metal ions from aqueous solutions. Further study is warranted to evaluate its feasibility for the removal of heavy metals from the real environment.

Efficient removal of phosphate from aqueous solutions by red seaweed, Kappaphycus alverezii

2014 ◽  
Vol 84 ◽  
pp. 484-493 ◽  
Author(s):  
Manali Rathod ◽  
Kalpana Mody ◽  
Shaik Basha
Keyword(s):  
Aqueous Solutions ◽  
Red Seaweed ◽  
Efficient Removal

Gel formation in low-concentration aqueous solutions containing N-acetyl-L-cysteine and silver nitrate

2014 ◽  
Vol 55 (1) ◽  
pp. 175-179 ◽  
Author(s):  
S. D. Khizhnyak ◽  
M. M. Ovchinnikov ◽  
P. M. Pakhomov
Keyword(s):  
Aqueous Solutions ◽  
Silver Nitrate ◽  
Gel Formation ◽  
Low Concentration

scholarly journals Multifold curdlan gel formation by dialysis into aqueous solutions of metal salts

2005 ◽  
Vol 284 (3) ◽  
pp. 293-300 ◽  
Author(s):  
Masumi Sato ◽  
Masahiro Nobe ◽  
Toshiaki Dobashi ◽  
Takao Yamamoto ◽  
Akira Konno
Keyword(s):  
Aqueous Solutions ◽  
Metal Salts ◽  
Gel Formation

Synergistic gel formation in aqueous solutions of guar-gellan composition

2007 ◽  
Vol 41 (5) ◽  
pp. 274-277 ◽  
Author(s):  
D. Hoichman ◽  
L. I. Gromova ◽  
J. Sela
Keyword(s):  
Aqueous Solutions ◽  
Gel Formation

scholarly journals COMPARISON OF SELF-ORGANIZATION PROCESSES IN AQUEOUS SOLUTIONS OF L-CYSTEINE AND N-ACETYL-L-CYSTEINE WITH SILVER NITRITE

2021 ◽  
pp. 56-68
Author(s):  
Татьяна Викторовна Потапенкова ◽  
Дмитрий Викторович Вишневецкий ◽  
Александра Ивановна Иванова ◽  
Светлана Дмитриевна Хижняк ◽  
Павел Михайлович Пахомов
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Silver Nanoparticles ◽  
Light Scattering ◽  
Aqueous Solutions ◽  
Uv Spectroscopy ◽  
Self Organization ◽  
Gel Formation ◽  
Silver Solution ◽  
Scanning Electron

С помощью методов УФ спектроскопии, динамического светорассеяния (ДСР) и сканирующей электронной микроскопии (СЭМ) в водных растворах L-цистеина и N-ацетил-L-цистеина (НАЦ) с нитритом серебра (AgNO) при концентрации от 0.001 М до 0.025 М и различных соотношениях исходных компонентов изучены процессы самоорганизации, приводящие к образованию гидрогеля. Установлено, что для растворов на основе L-цистеин и AgNO (цистеин-серебряный раствор - ЦСР) с концентрацией исходных компонентов 0.025 М и выше образуются устойчивые гидрогели, содержащие наночастицы серебра (НЧС). В то же время, в растворах на основе НАЦ и AgNO гели и НЧС не формировались. Определены закономерности и условия, влияющие на процесс образования геля, что позволило предложить механизм гелеобразования в ЦСР. Using the methods of UV spectroscopy, dynamic light scattering (DLS) and scanning electron microscopy (SEM) in aqueous solutions of L-cysteine and N-acetyl-L-cysteine (NAC) add silver nitrite (AgNO) at different concentration from 0.001 to 0.025 M the processes of self-organization leading to the formation of a hydrogel have studied in various ratios of the initial components. It has found that for solutions based on L-cysteine and AgNO (cysteine-silver solution - CSS) with a concentration of initial components of 0.025 M form stable hydrogels containing silver nanoparticles (SNPs). At the same time, solutions based on NAC and AgNO are unable to form gels and SNPs. The regularities and conditions influencing the process of gel formation have been determined, which made it possible to propose a mechanism of gelation in the CSS.

scholarly journals GEL FORMATION IN AQUEOUS SOLUTIONS OF L-CYSTEINE AND SILVER NITRITE

2020 ◽  
pp. 45-53
Author(s):  
Татьяна Викторовна Потапенкова ◽  
Светлана Дмитриевна Хижняк ◽  
Дмитрий Викторович Вишневецкий ◽  
Павел Михайлович Пахомов
Keyword(s):  
Silver Nanoparticles ◽  
Amino Acid ◽  
Aqueous Solutions ◽  
Uv Spectroscopy ◽  
Self Organization ◽  
Gel Formation ◽  
Wide Range ◽  
Dilute Aqueous Solutions

В работе исследованы процессы гелеобразования в разбавленных водных растворах на основе простейшей аминокислоты L-цистеина и нитрита серебра (AgNO). С помощью метода УФ спектроскопии в широком диапазоне концентраций L-цистеина и AgNO в растворе от 0,001 до 0,05 М и различном соотношении L-цистеин/AgNO от 1,0/0,8 до 1,0/1,6. Изучены процессы самоорганизации, приводящие к образованию гидрогеля. Установлено, что для растворов с концентрацией исходных компонентов 0,05 М образуются устойчивые гидрогели, содержащие наночастицы серебра. The work investigated the processes of gelation in dilute aqueous solutions based on the simplest amino acid L-cysteine and silver nitrite (AgNO). The processes were studied using UV spectroscopy in a wide range of concentrations of L-cysteine and AgNO in solution from 0.001 to 0.05 M and various ratios of L-cysteine / AgNO from 1.0 / 0.8 to 1.0 / 1.6. Self-organization leading to the formation of a hydrogel. It was found that stable hydrogels containing silver nanoparticles are formed for solutions with a concentration of initial components of 0.05 M.

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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