Results 71 to 80 of about 656,315 (231)

The Buoyant Behavior of Viral and Bacterial DNA in Alkaline CsCl [PDF]

open access: yes, 1963
In equilibrium density gradient centrifugation, the banding polymer species is electrically neutral. The banding species for a negative polyelectrolyte with a polyanion P_(n)^(-z)n (where n is the degree of polymerization, and z the titration charge per
Davidson, Norman   +3 more
core   +1 more source

Perspectives on blended learning through the on-line platform, LabLessons, for Chemistry [PDF]

open access: yes, 2018
The effectiveness of blended learning was evaluated through the integration of an online chemistry platform, LabLessons. Two modules, Formation of Hydrogen and Titration, were designed by college mentors alongside classroom chemistry teachers to engage ...
Gryczka, Patrick   +6 more
core   +4 more sources

THIOCYANATE ION-SELECTIVE PVC MEMBRANE ELECTRODE [PDF]

open access: yesChemistry Journal of Moldova: General, Industrial and Ecological Chemistry, 2010
A potentiometric selective sensor based on trinuclear chromium(III) complex as a novel ionophore for the thiocyanateselective electrode is reported. The sensor displays a near Nernstian slope of 57 ± 2 mV per decade, over a wide pH range 3 - 11.
Mihail Revenco   +2 more
doaj  

Supramolecular Complexation of \u3cem\u3eN\u3c/em\u3e-Alkyl- and \u3cem\u3eN\u3c/em\u3e,\u3cem\u3eN\u3c/em\u3e′-Dialkylpiperazines with Cucurbit[6]uril in Aqueous Solution and in the Solid State [PDF]

open access: yes, 2009
Water seeds: Complex stoichiometry/composition and degree of oligomerization (oligomeric supramolecular complex formation) of cucurbit[6]uril (CB[6]) with N-alkyl- and N,N′-dialkylpiperazine were investigated in aqueous solutions by means of isothermal ...
Inoue, Yoshihisa   +11 more
core   +1 more source

Investigation of the Equilibrium Constant and Thermodynamic Properties of Borax Dissolution Using Titration Techniques

open access: yesDera Natung Government College Research Journal
This experiment uses the method of titrating saturated Borax aqueous solution with hydrochloric acid to determine the equilibrium constant of Borax as well as its enthalpy change, entropy change, and standard free energy of dissolution. Using this method,
Rimmo Loyi Lego, Lily Achumi
doaj   +1 more source

Humic acid protein complexation [PDF]

open access: yes, 2008
Interactions of purified Aldrich humic acid (PAHA) with lysozyme (LSZ) are investigated. In solution LSZ is moderately positively and PAHA negatively charged at the investigated pH values.
Koopal, L.K.   +4 more
core   +2 more sources

Interpretation of complexometric titration data: An intercomparison of methods for estimating models of trace metal complexation by natural organic ligands

open access: yes, 2015
With the common goal of more accurately and consistently quantifying ambient concentrations of free metal ions and natural organic ligands in aquatic ecosystems, researchers from 15 laboratories that routinely analyze trace metal speciation participated ...
I. Pizeta   +20 more
semanticscholar   +1 more source

Identification of a Histidine Metal Ligand in the \u3cem\u3eargE\u3c/em\u3e-Encoded \u3cem\u3eN\u3c/em\u3e-Acetyl-L-Ornithine Deacetylase from \u3cem\u3eEscherichia coli\u3c/em\u3e [PDF]

open access: yes, 2013
The H355A, H355K, H80A, and H80K mutant enzymes of the argE-encoded N-acetyl-L-ornithine deacetylase (ArgE) from Escherichia coli were prepared, however, only the H355A enzyme was found to be soluble. Kinetic analysis of the Co(II)-loaded H355A exhibited
Gillner, Danuta   +4 more
core   +1 more source

Energy Minimization of Discrete Protein Titration State Models Using Graph Theory

open access: yes, 2016
There are several applications in computational biophysics which require the optimization of discrete interacting states; e.g., amino acid titration states, ligand oxidation states, or discrete rotamer angles. Such optimization can be very time-consuming
Baker, Nathan A.   +4 more
core   +2 more sources

Acidity of edge surface sites of montmorillonite and kaolinite [PDF]

open access: yes, 2013
Peer ...
Cheng, Jun   +5 more
core   +1 more source

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