Release mechanism

Here X and Y are immobilizing groups. Fuji instant color films are based on a similar dye-release mechanism using the o-sulfonamidophenol dye-release compounds shown in Figure 8 (35). Similarly, immobilej -su1fonamidoani1ines, where Y is H and the phenol group is replaced by an NHR moiety, may be used as dye releasers. 

Agronomic Properties and Nutrient Release Mechanism. The conversion of UF reaction products to plant available nitrogen is a multistep process, involving dissolution and decomposition. Materials are slow to enter the soil solution by virtue of their low solubiUty. Longer polymer chain products are less soluble than shorter chains and take longer to become available to the plants. 

Agronomic Properties and Nutrient Release Mechanisms. The mechanism of nutrient release from SCU is by water penetration through micropores and imperfections, ie, cracks or incomplete sulfur coverage, ia the coating. This is followed by a rapid release of the dissolved urea from the core of the particle. When wax sealants are used, a dual release mechanism is created. Microbes ia the soil environment must attack the sealant to reveal the imperfections ia the sulfur coating. Because microbial populations vary with temperature, the release properties of wax-sealed SCUs are also temperature dependent. 

Figure 16-1 and 16-2 present the decision networks that guide contaminant release screening analysis. Figure 16-1 deals with contaminants in or under the soil and Fig. 16-2 addresses aboveground wastes. Any release mechanisms evident at the site will require a further screening evaluation to determine the likely environmental fate of the contaminants involved. 

Substances which function as tissue adhesives have the unique ability to remain in contact with tissues in localized areas for prolonged periods of time. Not only does the tissue adhesive function as a glue but it has the capacity to serve as a slow release mechanism for drug delivery as it is biodegraded. 

Release mechanism fails Failure to separate halves High Release is ictuated by dropping power. 

Quick disconnecting ducts Ductwork provided with a quick-release mechanism for disconnection providing easy access for cleaning the ductwork. 

Similar Ca2+ release mechanism operates also in smooth muscles, neurons and some peripheral tissues. 

Binding of the basic peptide to terminal polymer carboxylate groups may play a significant role in the release mechanism (124). 

A molecular probe with dual output signals offers two detection modes allowing use of the same probe in different environments. We have demonstrated how an AB2 self-immolative dendron with double quinone methide release mechanism can be applied to create a molecular probe with UV-Vis and fluorescence modes for the detection of a specific catalytic activity.15 The molecular probe is illustrated in Fig. 5.36. The central unit of the probe (the molecular adaptor) is linked to an enzymatic substrate that acts as a trigger and to two different reporter molecules. Cleavage of the enzymatic substrate triggers the release of the two reporters and a consequent activation of their signals. 

R. E. O Connor, The Drug Release Mechanism and Optimization of a Microcrystalline Cellulose Pellet System, Ph.D. dissertation, Philadelphia College of Pharmacy Science, 1987. 

P Colombo, R Bettini, P Santi, A De Ascentiis, NA Peppas. Analysis of the swelling and release mechanisms from drug delivery systems with emphasis on drug solubility and water transport. J Controlled Release 39 231-237, 1996. 

NA Peppas, NM Franson. The swelling interface number as a criterion for prediction of diffusional solute release mechanisms in swellable polymers. J Polym Sci Polym Phys Ed 21 983-997, 1983. 

The major release mechanism for many chemicals, however, is associated with use of the chemical or of chemical-containing products. Primary uses include combustion of fuels, industrial uses, commercial uses, household and other consumer uses, deliberate applications in the environment (for example,... 

In this investigation we experimentally determine the factors controlling the release of non-Brownian particles. Also, we discover the initial particle release mechanism, (i.e., rolling-vs-sliding). 

A summary of the most important experimental findings of Chamoun (H), along with a description of the experimental apparatus and procedure, is presented in this chapter. In particular, the experiments have shown which factors (such as pH, ionic strength, etc.) control the release of non-Brownian particles and also have proven that the initial particle release mechanism is rolling rather than sliding. 

Fitzgerald, J.L. and Reid, J.J., Interactions of methylenedioxymethamphetamine with monoamine transmitter release mechanisms in rat brain slices, Naunyn Schmiedeberg s Arch. Pharmacol. 347(3), 313-323, 1993. 

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