Solid, activity organic

Cr(VI).Other remediation processes for Cr(VI) contaminated soils include H2S injection, aqueous Fe(II) injection, and the use of reduced Fe solids. Aqueous-phase Cr(VI)-Fe(II) redox reactions may be significant if Fe2+ concentrations are in equilibrium with relatively soluble, ferric hydroxide-like phases (Tokunaga et al., 2003). The overall interactions involving microbial activity, organic carbon degradation, Fe2+, and mineral surfaces control the net rates of Cr(VI) reactions in soils. 

Multicomponent reaction systems are highly valued in solid-phase organic synthesis because several elements of diversity can be introduced in a single transformation.1 The Mannich reaction is a classic example of a three-component system in which an active hydrogen component, such as a terminal alkyne, undergoes condensation with the putative imine species formed from the condensation of an amine with an aldehyde.2 The resultant Mannich adducts contain at least three potential sites for diversification specifically, each individual component—the amine, aldehyde, and alkyne—can be varied in structure and thus provide an element of diversity. 

The first applications of solid phase synthesis were to peptides, hence it is no surprise that there have been several reports of HRMAS studies of peptide systems attached to a support. One of the earliest reports of HRMAS in a supported sample was that of Wang-bound lysine, whose structure was determined by TOCSY and HMQC HRMAS NMR.38 More recently, HRMAS NMR has been used to identify several peptidomimetic inhibitors of hepatitis C virus NS3 protease while on the resin.79 However, it is perhaps a bit surprising that more has not been made of HRMAS in attacking problems of relevance to peptide synthesis, although most recent interest is moving that way. Combinatorial chemistry and solid phase organic chemistry has been a much more active area using HRMAS techniques. 

Table 1 indicates the solids or substances that can be effectively separated by the adsorptive bubble separation process. In general, the light-weight suspended solids, such as fibers, activated sludge, free oil, chemical floes, and fats, can be readily separated by the process in accordance with the physical-chemical bubble attachment mechanism shown in Fig. 1. The colloidal solids, soluble organics, soluble inorganics, and surface-active substances can be separated from the bulk liquid by the bubble separation process after they are converted from colloidal or soluble form into insoluble form (i.e., suspended solids), which can then be floated by gas bubbles. 

Alternatively, an adsorptive bubble separation process in accordance with its surface-adsorption phenomena, shown in Fig. 1, can separate the soluble surface-active substances easily. Non-surface-active suspended solids, colloidal solids, soluble organics, and soluble inorganics can all be converted into surface-active substances. All surface-active substances (in either soluble form or insoluble form) can be effectively floated by gas bubbles (75). 

A covalent linkage between the active moiety and the support guarantees a nonleaking reagent, and thus fulfills one of the most important requirements for PSR technology applications. Solid-phase organic chemistry is used for the preparation... 

Dithiocarbamates have received considerable attention in recent times because of their occurrence in a variety of biologically active compounds. They also play pivotal roles in agriculture, and they act as linkers in solid-phase organic synthesis. In addition, functionalized carbamates are an important class of compounds and their medicinal and biological properties warrant study. 

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