نتایج جستجو برای: microbial cultures
تعداد نتایج: 212762 فیلتر نتایج به سال:
Social insects use odors as cues for a variety of behavioral responses, including nestmate recognition. Past research on nestmate recognition indicates cuticular hydrocarbons are important nestmate discriminators for social insects, but other factors are likely to contribute to colony-specific odors. Here we experimentally tested whether external microbes contribute to nestmate recognition in r...
UNLABELLED BACKGROUND Biotransformation by using microbial and plant cell cultures has been applied effectively for the production of fine chemicals on large scale. Inspired by the wealth of literature available on the biotransformation of steroids, we decided to investigate the biotransformation of ethynodiol diacetate (1) by using plant and microbial cultures. RESULTS The biotransformati...
A new method to determine microbial (bacterial and fungal) activity in various freshwater habitats is described. Based on microbial reduction of dimethyl sulfoxide (DMSO) to dimethyl sulfide (DMS), our DMSO reduction method allows measurement of the respiratory activity in interstitial water, as well as in the water column. DMSO is added to water samples at a concentration (0.75% [vol/vol] or 1...
Microbial communities in coastal subsurface sediments are scarcely investigated and have escaped attention so far. But since they are likely to play an important role in biogeochemical cycles, knowledge of their composition and ecological adaptations is important. Microbial communities in tidal sediments were investigated along the geochemical gradients from the surface down to a depth of 5.5 m...
AIM To determine how long it takes neonatal blood cultures to become positive. METHODS Data were collected retrospectively on 451 positive blood cultures from babies on a tertiary neonatal unit between January 1997 and December 1998. During the study period, the laboratory used the BacT/Alert microbial detection system. RESULTS Complete information was available on 416 blood cultures. Twelv...
Abstract Background and Objective: Septi scrub is a new product based on chlorhexidine 4%, which is produced for surgical scrub in Iran. This study aimed to compare the disinfecting effect of Povidone Iodine and Septiscrub in surgical scrub. Material and Methods: this crossover experimental study, one-week interval, was conducted to compare Povidone Iodine and Se...
Conjunctival microbial flora is the main source of organisms causing postoperative endophthalmitis. Therefore this study has been performed to evaluate this flora in patients undergoing intraocular surgery. This nonselective study was done prospectively on 251 eyes of 211 patients who underwent intraocular surgery during 1378-1379 (1999-2000 AD) in Hazrat Rasul-e Akram hospital, Tehran, Iran...
Microbial identification from blood cultures is essential to institute optimal antibiotic therapy and improve survival possibilities. Matrix-assisted laser desorption ionization-time of flight mass spectrometry (MALDI-TOF MS) has been successfully applied to identify bacteria and yeasts from positive blood cultures broths. The aim of this multicentre study was to evaluate the reliability of the...
Consecutive batch culture, a technique which involves sequential transfer of cultures to fresh medium at regular intervals, was used to establish mixed ruminal-microbial populations in an anaerobic medium containing highly digestible hay. Once volatile fatty acid production was stable, perturbations were imposed in consecutive cultures by the addition of one of each of the following pentoses or...
Enrichment cultures of microbial consortia enable the diverse metabolic and catabolic activities of these populations to be studied on a molecular level and to be explored as potential sources for biotechnology processes. We have used a combined approach of enrichment culture and direct cloning to construct cosmid libraries with large (>30-kb) inserts from microbial consortia. Enrichment cultur...
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