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It has been well-known that slotted ALOHA systems exhibit unfavorable bistable behavior, since 1970s. It was proved that we can eliminate bistable region by limiting the number of allowable transmission attempts per packet to eight or less. In this paper, we investigate bistable behavior of slotted ALOHA systems with delay constraints and geometric transmission probability in terms of the catastrophe...
By self-assembly in aqueous solution, calix- (CAS) and thiacalix[4]arene-p-tetrasulfonate (TCAS) formed luminescent complexes Tb III ·(CAS) 2 and Tb III ·TCAS, respectively, which were utilized as a host for cationic guests. Addition of 1-ethylpyridinium guest quenched luminescence of Tb III ·(CAS) 2 in accordance with the Stern-Volmer (SV) relation with a low...
New di- (2) and tetracarboxylate ligands (4) were prepared on a sulfonylcalix[4]arene platform by O-alkylation of thiacalix[4]arene with ethyl bromoacetate, followed by hydrolysis of the ester function and oxidation of the sulfide bridges. The sulfonyl-based ligands 2 and 4 formed luminescent 1:1 complexes with terbium(III) ion having higher luminescent quantum yield (Φ=0.29 1 and 0.28 ...
Alternative splicing is an important mechanism contributing to the increased proteome diversity in higher eukaryotes. We have explored the alternative splicing events in the Drosophila longitudinals lacking (lola) gene by means of 5' RACE, 3' RACE, genome sequence searches, and EST sequencing. We demonstrated that the lola locus is comprised of 32 exons spanning over 60 kb, and encodes a total of...
A gene conferring resistance to fosmidomycin (Fs) was cloned from the gene pool of a wild-type strain of Escherichia coli. The cloned DNA fragment was sequenced and shown to encode a putative polypeptide of 406 amino acids (aa) with a molecular weight of 43 303. The gene mapped at 10.9 min on the E. coli chromosome and was designated fsr (fosmidomycinr esistance). Maxicell analysis revealed that...
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