Ju-Mei Feng

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The fine structure of oyster leucocytes resembles to a great extent, that of typical eucaryotic cells. Organelles which have been described for the first time in this report are light granules, dense granules, protocentriole and X structure. Light microscopy reveals two morphological types of oyster leucocytes: agranular and granular. Based upon nuclear(More)
Three methods were used to determine the enhancement by sodium dodecyl sulfate (SDS) of prodigiosin formation in Serratia marcescens O8. The results of the agar disk diffusion method indicated that pigment formation was dependent upon the concentration of SDS. Diameters of the pigment zones were proportional to the logarithm of SDS concentrations of 300 to(More)
Baogongteng A (BGT-A), a naturally occurring tropane muscarinic agonist isolated from Chinese medicinal plant, exhibits a bioactive effect different from those of many tropane alkaloids that are muscarinic antagonists. A series of racemic derivatives of BGT-A was synthesized to study the structure-activity relationships (SAR). To explore further the SAR in(More)
The relationship between muscarinic receptor affinity states and the contractile response to the muscarinic agonists carbachol, aceclidine, and pilocarpine, has been examined in the isolated rabbit iris muscle. Contraction of the iris muscle by carbachol and aceclidine was more potent and/or more efficacious than the response to pilocarpine. Analysis of(More)
Serratia marcescens produces a characteristic red pigment, prodigiosin, which is formed by the enzymatic coupling of 4-methoxy-2,2'-bipyrrole-5-bipyrrole-5-carboxaldehyde (MBC) and 2-methyl-3-amylpyrrole (MAP). Many clinical isolates which are resistant to multiple antibiotics are nonpigmented. However, the relationship of pigmentation (or nonpigmentation)(More)
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