Kropp studies

Davidova lA, LM Gieg, M Nanny, KG Kropp, JM Suflita (2005) Stable isotopic studies on -alkane metabolism by a sulfate-reducing bacterial enrichment culture. Appl Environ Microbiol. 71 8174-8182. 

The enhancement of the fluorescent yield of terbium, europium, and gadolinium in heavy-water solutions was studied by Kropp and Windsor (105). They observed substantial increases in emission intensities for both terbium and europium compounds when ordinary water was replaced by deuterated water. No appreciable increase was observed for gadolinium, however. For terbium they also obtained the fluorescent lifetimes of the 5D4 state. 

Kropp and Windsor (105,107) studied extensively the effects of deutera-tion on the luminescence characteristics of some rare-earth complexes. Solutions of europium and terbium salts in heavy water give fluorescence intensities and lifetimes many times greater than the corresponding solutions in ordinary water. Table X gives the results of their studies on europium... 

Gallagher (154) studied with very great care the fluorescent behavior of europium chloride in D20—H20 mixtures. He gave qualitative confirmation to most of the findings of Kropp and Windsor however, three distinct differences were observed ... 

First extension Lanthanide and curium complexes in solution Since the 1980s, the concepts of the previous studies have been extended on the basis of a detailed experimental work (Horrocks and Sudnick, 1983). Note however that such an extension was clearly envisioned in a former paper (Kropp and Windsor, 1967). 

Ziegenbein M, Kropp S, Kuenzel HE. Combination of clozapine and ziprasidone in treatment-resistant schizophrenia an open clinical study. Chn Neuropharmacol 2005 28 220-4. 

In the l960s, Kropp showed that fused bicyclic dienones structurally related to santonin could potentially serve as synthetically useful precursors to either spirocyclic skeletons or hydroazulenones. One of these cases, 91, was successfully used by Marshall and Johnson as the starting point in an elegant synthesis of the spirocyclic sesquiterpene )6-vetivone (Scheme 23). More recently, a variety of bicyclic cyclohexadienones have been studied by Caine and coworkers. For example, bicyclic dienone 92 could be photochemically rearranged to the oxygenated bicyclo[4.3.0]nonenone system 93, along with other rearrangement products, via acetic acid solvolysis of the cyclopropyl ketone intermediate. ... 

Although Zika and co-workers (36) investigated the direct photoreaction of methyl iodide, there are few other environmentally relevant studies of direct photoreactions of saturated halocarbons in water. Kropp (37), however, re-... 

Kropp has made a careful study of the direct irradiation of a-pinene (237) to give a mixture of cis- and truMs-ocimenes (238) and (239) uncontaminated with p-menthadienes. The photochemical autoxidation of /5-pinene in the presence... 

Structural Isomerization Reactions.—In earlier work Kropp and his co-workers19 suggested that the unsaturated and cyclopropane products formed by the irradiation of olefins in solvents of low nucleophilicity were produced by initial rearrangement to carbenes. In a later study Kropp and Fields20 have demonstrated that carbene intermediates are indeed formed in the irradiation of olefins... 

Kropp and his co-workers195 have continued their studies on the photochemical reactions of alkyl halides. The compounds studied in this report were the halonorbornanes (286). The iodonorbornane (286a) forms the ether (287) when... 

Very recently, a good review of the 184.9 nm photoisomerization of olefins and strained cycloolefins was published by Adam andd OppenlSnder (109). For the smallest members of this group, one of the more important studies comes from Fields and Kropp (110) they observed tht the liquid or solution photochemistry of C5-C7 monocyclic monoolefins gives rise to a variety of mono- and bicyclic isomers, whose formation may be explained in terms of a carbene intermediate ... 

Despite considerable studies of silica promoters in traditional liquid solvents [Basiuk, (27), Kropp et al (22) and Kodomari et al, (23)], the use of silica or alumina to promote reactions in scCOj had not been reported as of 1997. Alternatively, Poliakoff and co-workers reported Friedel-Crafts (24) and hydrogenation (25) reactions in SCCO2 using sulfonylated polysiloxane and polysiloxane-supported... 

Dreschhoff GAM, Zeller EJ, Kropp WR (1982) Study of radioelement concentrations in northern Victoria Land by gamma-ray spectrometry. Ant J US 17(5) 4-5 Dreschhoff GAM, Zeller EJ, Kropp WR (1983a) Radiometric survey in northern Victoria Land. In Oliver RL, James PR, Jago JB (eds) Antarctic earth science. Australian Academy of Science, Canberra. A.C.T., pp 429-432 Dreschhoff GAM, Zeller EJ, Schmid H, BuUa K, Morency M, Tremblay A (1983b) Radioactive mineral occurrence at Szabo Bluff, Transantarctic Mountains. Antarctic J US 18(5) 48-49... 

Considerahons of probable mechanisms of aging for mipafox-inhibited serine esterases suggest that mass spectrometry studies would support a deprotonation mechanism for NTE or NEST and hydrolytic P—N bond scission for AChE and BChE. As summarized in Figure 63.10, these expectahons were borne out for human recombinant NEST, which was used as a surrogate for NTE (Kropp et al., 2004) and BChE, respectively (Kropp and Richardson, 2007). However, mipafox-inhibited AChE gave the surprising result, confirmed by... 

Fluorescence yield studies have shown that mechanisms other than multiphonon-like processes can play an important part in the non-radiative relaxation of some states. For example, Kropp and Windsor (1965) pointed out that for Eu(N03)3 in CH3OH, only about one-half of the energy associated with the excited Di state is transferred to the lower Do state. The remainder is transferred to ground by other processes. This fast non-radiative decay of the Di state also accounts for the temperature dependent decrease in the lifetime of the Do state, since at higher temperature some thermal excitation to the D from the Do state occurs, and the very rapid non-radiative decay associated with the Di state aids in the deactivation of the Do state (Kropp and Dawson, 1966). 

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