Sodium dodecyl sulfate-stable

Isoelectric point 6.5-6 8 (human) 3.9-5.0 (mouse). Sensitive to trypsin, chymotrypsm, sodium dodecyl sulfate. Stable in 2-mercaptoethanol, urea (2-4 mol/liter), neuraminidase. Stable at pH 3-10 at 56°C for 60 min. Unstable after 30 min. at 70 C,... 

The methacrylic backbone structure makes the spherical Toyopearl particles rigid, which in turn allows linear pressure flow curves up to nearly 120 psi (<10 bar), as seen in Fig. 4.45. Toyopearl HW resins are highly resistant to chemical and microbial attack and are stable over a wide pH range (pH 2-12 for operation, and from pH 1 to 13 for routine cleaning and sanitization). Toyopearl HW resins are compatible with solvents such as methanol, ethanol, acetone, isopropanol, -propanol, and chloroform. Toyopearl HW media have been used with harsh denaturants such as guanidine chloride, sodium dodecyl sulfate, and urea with no loss of efficiency or resolution (40). Studies in which Toyopearl HW media were exposed to 50% trifluoroacetic acid at 40°C for 4 weeks revealed no change in the retention of various proteins. Similarly, the repeated exposure of Toyopearl HW-55S to 0.1 N NaOH did not change retention times or efficiencies for marker compounds (41). 

P 20] The reaction was carried out using ethylene glycol/water (60 40 wt.-%) and hydrogen [63, 66]. To stabilize the gas/liquid interface, sodium dodecyl sulfate was added as surfactant. By this means, a foam stable for at least 6 min at 60 °C was achieved. Bubbles of a typical size of 200 pm were formed. The liquid content in the foam amounted to 20%. 

To the filtered seawater (500 ml about 1.5 xg U) is added 0.05 M ferric chloride (3 ml), the pH is adjusted to 6.7 0.1 and the uranium present as (U02(C03)3)4- is adsorbed on the colloidal ferric hydroxide which is floated to the surface as a stable froth by the addition of 0.05% ethanolic sodium dodecyl sulfate (2 ml) with an air-flow (about 10 ml min-1) through the mixture for 5 min. The froth is removed and dissolved in 12 M hydrochloric acid-16 M nitric acid (4 1) and the uranium is salted out with a solution of calcium nitrate containing EDTA, and determined spectrophotometrically at 555 nm by a modification of a Rhodamine B method. The average recovery of uranium is 82% co-adsorbed WO4- and M0O4- do not interfere. 

Potl inhibitors differ from other protease inhibitors, and from all other defense peptides mentioned thus far, in their relative lack of disulfide bonds. This means that the loop with the reactive site is not fixed, as it is in the Bowman-Birk inhibitors, yet they still form a stable fold, as shown in Figure 11. An interesting feature of some Potl inhibitors is their tendency to form stable, noncovalently bound oligomers. This has, for example, been shown for chymotrypsin inhibitor I from tomato. This peptide has a monomer weight of 8300 Da under dissociating sodium dodecyl sulfate (SDS) gel conditions. Gel filtration and ultracentrifugal analysis revealed a... 

An emulsion that is, for instance, stable over many years at low droplet volume fraction may become unstable and coalesce when compressed above a critical osmotic pressure 11. As an example, when an oil-in-water emulsion stabilized with sodium dodecyl sulfate (SDS) is introduced in a dialysis bag and is stressed by the osmotic pressure imposed by an external polymer solution, coarsening occurs through the growth of a few randomly distributed large droplets [8]. A microscopic image of such a growth is shown in Fig. 5.1. 

A study of the foaming capacities and stabilities [10] of a variety of air-entraining agents in a solution of cement extracts showed that commonly used anionic air-entraining agents, such as sodium dodecyl sulfate and sodium resinate (1) were visually precipitated from solution, (2) retained their ability to form stable foams after precipitation with only minor amounts of admixture left in solution, and (3) lost the major part of their ability to form stable foams after filtration. It was further shown from studies in cement pastes firstly that the admixture should be adsorbed on the solid particles of the paste with the non-polar ends of the molecule pointed towards the water phase, imparting a hydrophobic character to the cement... 

Nematic liquid crystals prepared from 35.9% sodium dodecyl sulfate, 7.2% decanol, and 56.9% water (H20 or D20) Ferrofluid (1%) dispersed in the liquid crystal Stable nematic II liquid crystalline ferrofluid was produced diameter = 154 9.4 A number of grains/cm3 = 1.9 x 10 magnetization at saturation = 2.20 g/cm3 785, 786... 

Rh/tppts catalysed hydroformylation of 1-dodecene was carried out in highly stable microemulsions generated by conventional surfactants e.g. sodium dodecyl sulfate and co-surfactants (butanol) which breaks after the reaction into two phases facilitating catalyst recovery 4,4... 

Anionic surfactants are negatively charged in an aqueous solution (i.e., -COO-, -OSOj), and widely used because of their cost and performance. Sodium lauryl sulfate, the main component of which is sodium dodecyl sulfate, is highly soluble in water and commonly used to form oil-in-water (O/W) emulsions. Reacting an alkali hydroxide with a fatty acid (e.g., oleic acid) can produce alkali metal soaps (e.g., sodium oleate). Careful attention must be paid to the pH of the dispersion medium and the presence of multivalent metals (see Section 4.2.5). Alkali earth metal soaps (e.g., calcium oleate) produce stable water-in-oil (W/O) emulsions because of their low water solubility and are produced by reacting oleic acid with calcium hydroxide. Triethanolamine stearate produces stable O/W emulsions in situ by reacting triethanolamine in aqueous solution with melted stearic acid at approximately 65°C (e.g., vanishing cream). 

Combined e.s.r., p.m.r. Sodium dodecyl sulfate (NaLS) Stable radicals 1 Random spatial orientation Waggoner et al., 1967 d... 

Later, Yoshikawa and Matsubara [40] further studied a non-linear system and proposed a mechanism for the periodic behaviour that involved the formation of inverted micelles that suddenly moved to the oil phase after the concentration of adsorbed surfactants reached a critical value. They extended the experiment to a water/oil/water three-phase system in a U-shaped glass tube that gave spontaneous and stable oscillatory behaviour over a long period [41]. Since then, various characteristics of non-linear behaviour have been investigated and several mechaiusms for the non-linear behaviour have been proposed by many research groups including ours[2,5,10,42-48] however, the mechanism at a molecular level has not been clarified yet and no consensus has been achieved. The difficulty in the explanation seems to come from not only the complexity and diversity of the systems, but also limitations of the observation methods that enable us to monitor dynamic molecular behaviour at liquid/liquid interfaces with sufficient interfacial selectivity and time resolution. In this section, the TR-QELS method has been applied to the investigation of W/NB—sodium dodecyl sulfate (SDS) two-phase system [10]. 

Mesostructured alumina with hexagonal structure can be synthesized in the presence of sodium dodecyl sulfate (SDS), but it was not stable upon surfactant removal. Thermally stable mesoporous alumina has been obtained by nsing triblock copolymer as templates in ethanol solntion. Most alumina mesophases consist of amorphous or semicrystalline framework. Recently, Pinnavaia and coworkers developed a novel three-step assembly method to prepare mesostructured alumina with framework walls composed of crystalline, lathlike y-A Os nanoparticles. ... 

Properties of Dispersions and Polymers. All polymer dispersions with SDS (sodium dodecyl sulfate) as an emulsifier were stable for at least 8 months. Dispersions with Na laurate as emulsifier flocculated after a short time. Polyacrylates on drying yielded clear and coherent films polystyrene and PMMA dispersions gave opaque and brittle layers. The doses needed for polymerization were well below a dose which causes cross linking or degradation. 

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