nowadays, uncontrolled and frequent use of antibiotics may cause emergence of microbial resistanceamong pathogenic agents. therefore, the use of new synthetic and natural antimicrobial compounds isinevitable. one source of natural compounds in this respect comes from plants. the purpose of this study was to examine the antibacterial effects of peel extracts from sour and sweet pomegranate. meth...

During routine addition of penicillinase (beta-lactamase) to patients sera, we found that the capacity of some of these sera to kill serum-sensitive gram-negative organisms was significantly decreased. Further controlled studies showed that penicillinase decreased both the bactericidal activity of normal human sera and the total hemolytic activity (CH50) of complement in these sera. The decreas...

five strains of mouth normal microflora containing staphylococcus epidermidis, streptococcus mutant, lactobacillus acidophilus, actinomyces viscosos and candida albicans, were isolated and identified then cultured and purified on different media by using routine methods in microbiology. extract of 3 garlic samples south (khuzestan), north (mazanderan) and hamedan garlics, were affected on these...

BACKGROUND To extract, purify, and identify the effective constituents of aqueous extract of Fructus Chebulae Immaturus, and analyze the bactericidal effects of total tannins. METHODS Preparative thin layer chromatography and semi-preparative high performance liquid chromatography were used to isolate and purify the total tannin fraction. (1)H- and (13)C- NMR spectroscopy were used to elucida...

Epidemiological data show that O18:K1 Escherichia coli is a common cause of neonatal bacteremia and meningitis. These bacteria were capable of multiplying in the bloodstream of newborn rats and were resistant to the bactericidal effects of complement in the absence of specific antibodies. The roles played by the O antigen and the K antigen in complement resistance were analyzed by comparing the...

The bactericidal effect of sunilight was demonstrated as early as 1878 by Downes and Blunt who reported that culture media exposed to sunlight for several hours remained sterile, wlrhile corresponding portions of the same media which were allowed to stand in shaded portions of the same room became contaminated. Tizzoni and Cattani (1891) and Wesbrook (1896) reported the killing of Clostridium t...

abstract aims: bovine mastitis continues to be the most costly disease to the dairy farmers. it dominates in iran as one of the most prevalent diseases in dairy cattle among the dairy farms. mastitis treatment with antibiotics leads to the development of antibiotic resistant strains and consumer health problem. this study was performed for the first time to analyze in vitro effects of hydro-alc...

The bactericidal effect of sunilight was demonstrated as early as 1878 by Downes and Blunt who reported that culture media exposed to sunlight for several hours remained sterile, wlrhile corresponding portions of the same media which were allowed to stand in shaded portions of the same room became contaminated. Tizzoni and Cattani (1891) and Wesbrook (1896) reported the killing of Clostridium t...

One approach to enhance the disinfection of root canals in endodontic treatment is ultrasonic irrigation with sodium hypochlorite. Reactive oxygen species, such as hydroxyl radical, are generated by biological defense systems to kill invading bacteria. Ultrasonic irrigation with hydrogen peroxide may be a promising option to increase hydroxyl radical generation. We examined the bactericidal eff...

Thirty three patients with rheumatoid arthritis (RA) treated only with non-steroidal anti-inflammatory drugs were divided into two groups according to the drug received (group A: diclofenac, group B: indomethacin or ketoprofen), and their polymorphonuclear (PMN) cell functions were investigated. We found that bactericidal ability was the only function significantly impaired in group A as compar...