this work was to isolate and identify the bioactive secondary metabolite which was produced by myxobacterium stigmatella eracta wxnxj-b, and to evaluate its antitumor and apoptosis-inducing effects. the results showed that one novel compound (molecular formula c29h25no3) was isolated, purified by sephadex lh-20 column chromatography and preparative rp-hplc, and identified as 5-(6-benzyl-quinoli...

The chemistry of boron cations was a field long neglected [2]. Meanwhile, many cations containing tetracoordinated boron have been reported [3] and their chemistry has been explored. In addition there exists scattered information relating to tri[4-8] and dicoordinated [9, 10] boron cations. Unlike carbenium ion chemistry their role in boron chemistry is not yet well understood. This situation, ...

INTRODUCTION Tetrodotoxin (Figure 1) is a naturally occurring compound isolated from the liver and ovaries of puffer fish. Due to its potent toxicity as a selective blocker of voltage-gated Na ion channels and the high regard for puffer fish as a culinary delicacy, tetrodotoxin has become a molecule of general, as well as scientific, interest. Structural determination revealed a densely functio...

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