Cong-Ran Li

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The in vitro development of resistance to the new nonfluorinated quinolones (NFQs; PGE 9262932, PGE 4175997, and PGE 9509924) was investigated in Staphylococcus aureus. At concentrations two times the MIC, step 1 mutants were isolated more frequently with ciprofloxacin and trovafloxacin (9.1 x 10(-8) and 5.7 x 10(-9), respectively) than with the NFQs,(More)
Lysostaphin is a glycylglycine endopeptidase. It cleaves the pentaglycine cross-bridge structure unique to the staphylococcal cell wall and is considered to be a potential drug for Staphylococcus aureus. In the present study, the in vitro activity of recombinant lysostaphin was investigated in 257 S. aureus isolates collected from hospital patients in(More)
OBJECTIVES To evaluate the in vivo antibacterial efficacy of chinfloxacin, a novel fluoroquinolone, in murine systemic and local infection models. METHODS The efficacy of chinfloxacin in systemic infection was evaluated in a mouse peritonitis model using isolates of methicillin-susceptible Staphylococcus aureus (MSSA, n = 3), methicillin-resistant(More)
OBJECTIVES To evaluate the in vivo antibacterial efficacy of nemonoxacin, a novel C8-methoxy non-fluorinated quinolone in murine systemic and local infection models. METHODS The efficacy of nemonoxacin in systemic infections was evaluated in mouse peritonitis models using isolates of methicillin-susceptible Staphylococcus aureus (MSSA, n=1),(More)
The susceptibilities of vertilmicin and seven reference aminoglycosides to modifications by six recombinant aminoglycoside-modifying enzymes, AAC(6')-Ie, APH(2'')-Ia, AAC(6')-Ie-APH(2'')-Ia, ANT(2'')-Ia, AAC(6')-Ib, and AAC(6')-Ib-cr, were studied by coupled spectrophotometric assays in microtiter plates. In comparison to other aminoglycosides, the(More)
Vertilmicin is a novel aminoglycoside antibiotic with potent activity against gram-negative and -positive bacteria in vitro. In this study, we further evaluated the efficacy of vertilmicin in vivo in systemic and local infection animal models. We demonstrated that vertilmicin had relatively high and broad-spectrum activities against mouse systemic(More)
MRX-I is a potent oxazolidinone antibiotic against Gram-positive pathogens, including methicillin-resistant Staphylococcus aureus (MRSA), penicillin-resistant Streptococcus pneumoniae (PRSP), penicillin-intermediate S. pneumoniae (PISP), and vancomycin-resistant enterococci (VRE). In this study, the in vivo efficacy of orally administered MRX-I was(More)
The intracellular dispositions of clarithromycin and azithromycin in AIDS patients requiring Mycobacterium avium complex (MAC) prophylaxis were studied. The dispositions of both drugs in mononuclear and polymorphonuclear leukocytes were markedly different. Our data support the proven efficacy of these agents for MAC prophylaxis since clarithromycin and(More)
Several lines of evidence show that the nephrotoxic effect of melamine (MEL) in animals is consistent with combined ingestion of MEL and cyanuric acid (CYA). The aim of the present study was to compare the toxicokinetics of MEL in the presence and absence of CYA, and to elucidate the correlation between toxicity and kinetic properties of MEL. Sprague-Dawley(More)
Vertilmicin is a new semisynthetic aminoglycoside with a structure similar to that of netilmicin except for a methyl group at the C-6' position. In the present study, the in vitro antibacterial activity of vertilmicin was studied, and its susceptibility to modifications by the recombinant aminoglycoside bifunctional modifying enzyme AAC(6')-APH(2'') was(More)