Aqueous solution

In this study, we undertook the pyrochar from lemongrass essential oil distillation residue (LR) with incorporated alkali activation, scrutinizing its structural attributes, and assessing its efficacy in MB adsorption from aqueous solutions.

12p vifilm 11-10-2024 2 1   Download

In this study, heterogeneous catalysts were synthesized by hydrothermal method to load nano goethite to biochar derived from soybean curd residue, which served as catalysts for the heterogeneous degradation of tetracycline hydrochloride (TCH) in an aqueous solution.

9p viinuzuka 28-02-2025 3 1   Download

Carbon nanotubes (CNTs) are a new type of nano-adsorbent material with unique properties, which are promising adsorbents for the separation of enantiomers. Information regarding the interaction mechanism of enantiomers with carbon nanotubes has not yet been fully explored yet.

9p vibenya 31-12-2024 1 1   Download

Adsorbents functionalized with polyol are considered to be effective for the removal of boron from aqueous solutions. In this work, polyol-functionalized chitosan particles were successfully synthesized. Batch experiments were conducted for the determination of the optimal conditions for the highest degree of gluconated groups being grafted to chitosan substrate.

5p vibenya 31-12-2024 4 2   Download

The main aim of this investigation was to develop a low-cost solution to remove trace metals from the aqueous phase using biochar. This study investigated (i) the effect of giant reed-based biochar produced at varying temperatures in the treatment of aqueous solutions polluted with lead; and (ii) how the production of biochar at different temperatures affected its adsorption capacity for lead from the aqueous phase.

116p runthenight04 02-02-2023 20 4   Download

The target of this project is to construct a general and feasible procedure to determine the acidic equilibrium constants in aqueous solution at 25oC from the data of the potentiometric titration process in a rapid, simple and effective way. Then it will be applied to estimate the equilibrium constants of some new acids.

27p tunelove 10-06-2021 16 4   Download

The thesis focused on the synthesis of Mn, Ce, C doped ZnO nanoparticles materials and doped ZnO with multi-layered carbon nanotube nanocomposite materials and assessed their photo-oxidative potentiality through photocatalytic reactions of methylene blue (MB) decomposition in aqueous solution under visible light.

30p capheviahe27 23-02-2021 21 5   Download

The objectives of the thesis: The thesis focused on the synthesis of Mn, Ce, C doped ZnO nanoparticles materials and doped ZnO with multi-layered carbon nanotube nanocomposite materials and assessed their photo-oxidative potentiality through photocatalytic reactions of methylene blue (MB) decomposition in aqueous solution under visible light.

30p phongtitriet000 08-08-2019 47 4   Download

Human immunodeficiency virus type 1 protein R (HIV-1 Vpr) promotes nuclear entry of viral nucleic acids in nondividing cells, causes G2 cell cycle arrest and is involved in cellular differentiation and cell death. Vpr subcellular localization is as variable as its functions. It is known, that consistent with its role in nuclear transport, Vpr localizes to the nuclear envelope of human cells. Further, a reported ion channel activity of Vpr is clearly dependent on its localization in or at membranes.

6p system191 01-06-2013 39 4   Download

Uridine-5¢-diphospho-1-a-D-glucose (UDP-Glc) is a common substrate used by glucosyltransferases, including certain bacterial toxins such as Toxins A and B from Clostridium difficile. Fluorescent analogs of UDP-Glc have been prepared for use in our studies of the clostridial toxins. These compounds are related to the methylanthraniloylATP compounds commonly used to probe the chemistry of ATP-dependent enzymes. The reaction of excess methylisatoic anhydride with UDP-Glc in aqueous solution yields primarily the 2¢ and 3¢ isomers of methylanthraniloyl-UDPGlc (MUG).

8p research12 01-06-2013 45 4   Download

The solution structure of a synthetic mutant type I antifreeze protein (AFP I) was determined in aqueous solution at pH 7.0 using nuclear magnetic resonance (NMR) spectroscopy. The mutations comprised the replacement of the four Thr residues by Val and the introduction of two additional Lys-Glu salt bridges. The antifreeze activity of this mutant peptide, VVVV2KE, has been previously shown to be similar to that of the wild type protein, HPLC6 (defined here as TTTT).

8p research12 01-06-2013 37 4   Download

To investigate how solubility and steric issues affect the laccase-catalysedoxidationof phenols, a series of oligomeric polyphenol compounds, having increasing size and decreasing solubility in water, was incubated with laccase. The extent of substrate conversion, and the nature of the products formed in buffered aqueous solutions, were com-pared to those obtained in the presence of an organic cosolvent, and also in the presence of twomediating species, i.e. N-hydroxyphthalimide (HPI) and 2,2,6,6-tetramethyl-piperidin-1-yloxy (TEMPO). ...

6p tumor12 22-04-2013 45 2   Download

Nacre organic matrix has been conventionally classified as both
water-soluble and
water-insoluble,basedonits solubility in aqueous solutions after decalcificationwith acid or EDTA. Some characteristics (aspartic acid-rich, silk-fibroin-like content) were specifically attributed to either one or the other. The comparative study on the technique of extraction (extraction with water alone vs. demineralization with EDTA) presented here, seems to reveal that this gen-erally accepted classification may need to be reconsidered....

10p tumor12 22-04-2013 35 2   Download

The high-resolution 3D structure of the octapeptide hor-mone angiotensin II (AII) in aqueous solution has been obtained bysimulated annealing calculations, using high-resolutionNMR-derived restraints. After final refinement in explicit water, a familyof 13 structures was obtained with a backbone RMSD of 0.73 ± 0.23 A˚ . AII adopts a fairly compact folded structure, with its C-terminus and N-ter-minus approaching towithin
7.2 A ˚ of eachother.

12p tumor12 20-04-2013 32 2   Download

To investigate the structural function of the C-terminal amide group of endomorphin-2 (EM2, H-Tyr-Pro-Phe-Phe-NH2), an endogenous l-opioid receptor ligand, the solution conformations of EM2 and its C-terminal free acid (EM2OH, H-Tyr-Pro-Phe-Phe-OH) in TFE (trifluoroethanol), water (pH 2.7 and 5.2), and aqueous DPC (dodecylphosphocholine) micelles (pH 3.5 and 5.2) were investigated by the combination of 2D 1 H-NMR meas-urement and molecular modelling calculation.

19p fptmusic 12-04-2013 33 4   Download

Using solution NMR spectroscopy, three-dimensional structures have been obtained for an 18-residue synthetic polypeptide fragment of 18.5 kDa myelin basic protein (MBP, human residues Q81–T98) under three condi-tions emulating the protein’s natural environment in the myelin membrane to varying degrees: (a) an aqueous solution (100 mmKCl pH 6.5), (b) a mixture of trifluoroethanol (TFE-d2) and water (30 : 70% v⁄v), and (c) a dispersion of 100 mm dodecylphosphocholine (DPC-d38 , 1 : 100 pro-tein⁄lipid molar ratio) micelles....

14p dell39 27-03-2013 41 3   Download

Conformational studies on amyloidb peptide (Ab) in aqueous solution are complicated by its tendency to aggregate. In this study, we determined the atomic-level structure of Ab28)42 in an aqueous environment. We fused fragments of Ab, residues 10–24 (Ab10)24) or 28–42 (Ab28)42), to three positions in the C-terminal region of ribonuclease HII from a hyper-thermophile, Thermococcus kodakaraensis(Tk-RNase HII).

9p dell39 27-03-2013 39 3   Download

It has been previously reported that the structure of a human pancreatic ribonuclease variant, namely PM8, constitutes a dimer by the exchange of an N-terminal domain, although in an aqueous solution it is found mainly as a monomer. First, we investigated the solution conditions that favour the dimerization of this variant.

11p inspiron33 26-03-2013 55 5   Download

The interaction of xenon with copper⁄6-hydroxydopa (2,4,5-trihydroxy-phenethylamine) quinone (TPQ) amine oxidases from the plant pulses lentil (Lens esculenta) and pea (Pisum sativum) (seedlings), the perennial Mediter-ranean shrub Euphorbia characias(latex), and the mammals cattle (serum) and pigs (kidney), were investigated by NMR and optical spectroscopy of the aqueous solutions of the enzymes.

11p galaxyss3 21-03-2013 45 5   Download

Quantitation of superoxide radical (O2 – Æ) production at the site of radical generation remains challenging. A simple method to detect nanomolar to micromolar levels of superoxide radical in aqueous solution has been devel-oped and optimized. This method is based on the efficient trapping of O2 – Æ using a novel fluorescent probe (2-chloro-1,3-dibenzothiazolinecyclohex-ene), coupled with a spectra character-signaling increase event.

9p galaxyss3 21-03-2013 45 3   Download