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Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 106 for “"Calcium ions"”.
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Complexation of divalent copper, zinc and calcium ions by phosphate esters in aqueous solution
The role of metal ions as catalysts for numerous biochemical reactions has been the subject of many investigations. One of the most important classes of ligands are phosphate esters. In this thesis I describe the investigation of some phosphate ester-metal ion equilibria. Formation constants for …
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A Critical Assessment of the Role of Abscisic Acid and Calcium Ions in Regulating Stomatal Movements in Commelina communis L.
… appeared to be dependent on the availability of calcium ions. Synergism between calcium ions and ABA in suppressing stomatal opening was observed, and a factorial experiment revealed a highly significant interaction between calcium and abscisic acid. The effect of calcium appeared to be on the …
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Coagulant dipping of natural rubber latex
… coagulant dipping of natural rubber latex using calcium, chloride as the coagulant. The primary object of the investigation was to deepen understanding of the kinetics and the mechanisms of deposition. Results are given for the effect of variables such as solids content, latex viscosity, added …
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The binding of divalent cations to tobacco mosaic virus and to some isometric plant viruses
The binding of divalent cations (particularly calcium and magnesium) to strains of tobacco mosaic virus (TMV) and their isolated proteins was investigated, using equilibrium dialysis and potentiometric titration, in an attempt to elucidate the role of divalent cations in virus stabilisation. It was …
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A thermodynamic study of the effects of membrane composition on the binding affinity of annexin a5.
… the acidic phospholipid, phosphatidylserine, and calcium ion. We find by Isothermal Titration Calorimetry (ITC) that annexin a5 binds calcium ions with much higher affinity in the presence of non-cholesterol containing neutral and acidic phospholipid mixtures ((60:40) (POPC:POPS)) relative to …
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Particle Manipulation Using Electric Field Gradients in Microdevices
… particles for two different types of applications: tissue engineering and breast cancer detection. The first application studied the effects of electric fields on bacteria cells as well as calcium ions to potentially create a meniscus scaffold with hydroxyapatite ends for anchoring. In …
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Influence of additives on stabilization and mineralization pathway of amorphous calcium carbonate nanoparticles
Amorphous calcium carbonate (ACC) is of high interest because of its critical role in biomineralization. ACC can be a precursor of crystalline calcium carbonate phases that are more energetically stable. ACC is not only stored in organisms for long time for the subsequent mineralization of new …
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Determination of Calcium Binding to Beta-Casein at Various Ph Values Using the Calcium Murexide Method
Calcium binding to casein affects the formation of casein micelles and the behavior of the casein proteins during processing. Since calcium binding is pH dependent, it is important to understand the binding properties of the non-micellar caseins with calcium ions under the influence of pH. The …
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Meccanismo catalitico della perossidasi da Euphorbia characias
… and in both the presence and absence of calcium ions showing the presence oh three different pathways. Pathway I: ELP shows catalise-like activity catalyzing decomposition of hydrogen peroxide to water and oxygen; Pathway II involves the return to native enzyme with the concomitant …
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Effects of Background Ions on Polyethersulfone (Pes) Membrane Fouling by Natural Organic Matter (Nom)
… measurements with SRNOM. These tests showed that calcium caused formation of supramolecular NOM clusters. Large-scale MD simulations with multiple NOM molecules were then performed to probe possible formation of supramolecular NOM structures or aggregates. The MD simulations revealed two different …
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Optical Detection of Ultracold Neutral Calcium Plasmas
<p>We demonstrate an optical method to detect calcium ions in an ultracold plasma. We probe the plasma with a 397 nm laser beam tuned to a calcium ion transition. The probe laser beam is focused to a 160 µm waist allowing fine spatial resolution. Ions are detected by measuring fluorescence using a …
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Life Under Tension: Computational Studies of Proteins Involved in Mechanotransduction
… In this thesis, molecular dynamics simulations have been used to study proteins that transform forces into biochemical signals (mechanotransduction). The first protein studied is the mechanosensitive channel of small conductance MscS. This membrane channel has been proposed to act as a …
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Cellular Movements of Calcium and the Activation Process in Mammalian Heart Muscle
… beating, and on the pattern of previous contractions over a period of many seconds. The activator calcium ions, which are responsible for the magnitude of contraction triggered by each action potential, are released from two morphologically and functionally different cellular stores. The …
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Studies of Cytochrome C Oxidases From Rhodobacter Sphaeroides and Vibrio Cholerae
… heme c is involved in the electron translocations in a consequential way and is important for the activity and stability of the enzyme complex. Sequence alignment and structural modeling have shown that cbb 3--type oxidase contains only one proton channel (K-channel analogue) which consists of …
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Studies of cytochrome c oxidases from Rhodobacter sphaeroides and Vibrio cholerae
… heme c is involved in the electron translocations in a consequential way and is important for the activity and stability of the enzyme complex. Sequence alignment and structural modeling have shown that cbb3–type oxidase contains only one proton channel (K-channel analogue) which consists of …
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A control model of muscle contraction
… signals can correct for them. Transfer functions for each system are developed, with quantification derived for the excitation and the excitation-contraction coupling control systems. These latter systems include the release of acetylcholine into the synapse, the depolarization of the muscle …
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Biodegradable Polymeric Ion Releasing Fillers
… can provide sustained pH independent release of ions that promote remineralization in enamel. These PIRFs were rinsed to remove excess calcium ions and then charged with a 0.9M NaF solution or 3-6M K2HPO4 solution. After being soaked in these solutions the PIRFs exhibited effective ion release …
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