1. Mechanism of Fluoroquinolone Resistance Is an Important Factor in Determining the Antimicrobial Effect of Gemifloxacin against Streptococcus pneumoniae in an In Vitro Pharmacokinetic Model

Antibacterial effect and emergence of resistance to gemifloxacin and levofloxacin were studied in an in vitro pharmacokinetic model of infection. A panel of Streptococcus pneumoniae strains with known mechanisms of resistance were used; two strains had no known resistance mechanism, two had efflux pumps, three had gyrA plus parC mutations, and one had only a

American Society for Microbiology.

2. Effect of the Shot Peening Process on the Corrosion and Oxidation Resistance of AISI430 Stainless Steel

Ferritic stainless steels are used in specific applications where corrosion resistance, oxidation resistance and a high mechanical resistance are required. Shot peening is a process applied to add residual compression stresses in metallic surfaces with the intent of improving the material when exposed to corrosion due to stress and fatigue. Some studies abou

Mat. Res.. Publicado em: 2015-06

3. EFFECT OF A RETICULOENDOTHELIAL STIMULATING AGENT (RESTIM) ON RESISTANCE OF MICE

Ransom, John P. (New England Institute for Medical Research, Ridgefield, Conn.), Varsenig Z. Pasternak, and John H. Heller. Effect of a reticuloendothelial stimulating agent (restim) on resistance of mice. J. Bacteriol. 84:466–472. 1962.—The effect of restim, a preparation of yeast cell walls, on resistance of mice to challenge by Salmonella typhimurium

4. Effect of ultrasonic waves on the heat resistance of Bacillus spores.

The effect of ultrasonic treatment on the heat resistance of Bacillus spores differs widely both with the species and the strain tested. Ultrasonic waves do not affect the heat resistance of some strains, whereas they greatly reduce that of other strains of the same species. The heat-sensitizing effect of ultrasonic waves is more pronounced when short heatin

5. Alkyl hydroperoxide reductase, catalase, MrgA, and superoxide dismutase are not involved in resistance of Bacillus subtilis spores to heat or oxidizing agents.

Only a single superoxide dismutase (SodA) was detected in Bacillus subtilis, and growing cells of a sodA mutant exhibited paraquat sensitivity as well as a growth defect and reduced survival at an elevated temperature. However, the sodA mutation had no effect on the heat or hydrogen peroxide resistance of wild-type spores or spores lacking the two major DNA

6. The Effect of Cyanide and Carbon Monoxide on the Electrical Potential and Resistance of Cell Membranes 12

The rapid reduction in cell electropotentials induced by metabolic inhibitors is strong evidence for an electrogenic ion pump. According to Ohm's law, such a depolarization might be explained by a reduction in electric current, I, with unidirectional transport of a given ion, or an increase in permeability (decrease in resistance). With cells of etiolated se

7. Activity of cephalosporins against methicillin-susceptible and methicillin-resistant, coagulase-negative staphylococci: minimal effect of beta-lactamase.

Eight cephalosporins were tested for their activity against methicillin-susceptible and methicillin-resistant, coagulase-negative staphylococci and for their resistance to beta-lactamase from methicillin-resistant, coagulase-negative staphylococci. Susceptibility testing by the agar plate method was evaluated for the effect of inoculum size and duration of i

8. Early posthypoglycemic insulin resistance in man is mainly an effect of beta-adrenergic stimulation.

The insulin effect following hypoglycemia was studied with the euglycemic clamp technique in seven healthy subjects. Following an initial euglycemic clamp hypoglycemia was induced and after glucose recovery a second clamp was performed. Glucose production (Ra) and utilization (Rd) were studied with [3-3H]glucose. Each subject was studied four times; during i

9. Enhancement of Resistance to Infectious Diseases by Oral Administration of Brewer's Yeast

The effect of oral administration of brewer's yeast on resistance to infectious diseases was studied in laboratory animals. It was shown that there was a significantly increased enhancement of resistance to seasonal respiratory and enteric infections in rhesus monkeys. Similarly, enhanced resistance to experimental chronic infections was observed in mice aft

10. Effect of molybdate on phosphating of Nd-Fe-B magnets for corrosion protection

Nd-Fe-B magnets are highly susceptible to corrosion and need protection against environment attack. The use of organic coatings is one of the main methods of corrosion protection of these materials. Data related to the effect of conversion coatings, such as phosphating, on corrosion performance of these magnets is still scarce. Studies about the effect of ph

Materials Research. Publicado em: 2005-06

11. Resistance to Friend Murine Leukemia Virus Infection Conferred by the Fv-4 Gene Is Recessive but Appears Dominant from the Effect of the Immune System

Fv-4 is a mouse gene that dominantly confers resistance to infection with Friend murine leukemia virus (F-MuLV) (S. Suzuki, Jpn. J. Exp. Med. 45:473–478, 1975). However, the resistance caused by Fv-4 is recessive in nude mice, which suggests that immunological effects play important roles in this resistance in vivo (K. Higo, Y. Kubo, Y. Iwatani, T. Ono, M.

American Society for Microbiology.

12. Influence of Sintering Time on the PTCR Effect of Nb2O5-doped BaTiO3 Ceramics

The effects of the sintering time on the electrical properties and the positive temperature coefficient of resistance (PTCR) effect of Ba1.006(Ti1-xNbx)O3 (BTN) ceramics were investigated, which were sintered at 1190 ºC for 0.5-6 hours in a reducing atmosphere and then re-oxidized at 800 ºC for 1 hour. The results indicated that the sintering time affected

Mat. Res.. Publicado em: 16/09/2019