Search Results
Results 251 - 300 of 627
< 1 2 3 4 5 6 7 8 9 10 11 >
Hanhan O - - 2005
In this study the effect of retention time and rotation speed in the denitrification process in two full-scale rotating biological contactors (RBC) which were operated parallel and fed with municipal wastewater is evaluated. Each rotating biological contactor was covered to prevent oxygen input. The discs were 40% submerged. On the ...
Vazquez J - - 2005
OBJECTIVE: The objective of this randomized, cross-over clinical study was to compare the 4-h and overnight effects of a triclosan/copolymer/fluoride (TCF-AF) dentifrice and a commercially available breath freshening (CBF) dentifrice containing fluoride for their ability to control H(2)S-forming bacteria. METHODS: Following a 1 week washout period of brushing with a ...
Donlan R M - - 2005
Legionella pneumophila will infect biofilm-associated protozoa, and in this way might be protected from disinfectants in potable water systems. A base biofilm containing Pseudomonas aeruginosa, Klebsiella pneumoniae, and Flavobacterium spp. was grown on steel coupons in potable water prior to the addition of L. pneumophila and the protozoan H. vermiformis. ...
Abhijit Deshpande - - 2005
Electrochemical oxidation of low (BOD/COD) ratio pharmaceutical wastewater was investigated in this study, using cast iron electrode. The batch experimental results were assessed in terms of COD and BOD concentration while the recalcitrance was monitored in terms of change in the (BOD/COD) ratio during the process. The effects of operating ...
Kadlec R H - - 2005
This paper presents information on the hydraulic efficiency of wetlands and ponds, and examines the differences and similarities between degrees of mixing, short-circuiting and dead zones. It reports the pollutant removal performance of over 50 wetlands and ponds over the range of macrophyte cover from 100% (densely vegetated wetlands) to ...
Wood Nelson - - 2005
There is recent interest in recovery of periodontopathogenic bacteria from arterial and bronchial tissues to identify a link between periodontal and cardiovascular or pulmonary diseases. This interest could provide a useful clinical correlation exercise for gross anatomy. Our objective was to perform a feasibility study to determine whether these bacteria ...
Abira A - - 2005
The capacity of a pilot project subsurface flow constructed wetland in the tropics to remove phenol from pre-treated pulp and paper mill wastewater was studied under varying hydraulic retention times (HRT) with batch loading. Initial 15 months results indicate that removal efficiencies for phenol were variable but on average reached ...
Jeya M - - 2005
AIMS: To optimize the media components for xylanase production by Aspergillus versicolor MKU3 in solid-state fermentation (SSF). METHODS AND RESULTS: Medium optimization was carried out using De Moe's fractional factorial design with seven components. Maximum production of xylanase 3249.9 U g(-1) was obtained in SSF with an optimized medium containing ...
Xu Tao - - 2005
OBJECTIVE: The objective of this research was to assess two different published methods of plaque level evaluation on human subjects, and to determine whether both methods can produce similar findings to the point that the methods can be used interchangeably. METHODOLOGY: Healthy human volunteers entered into a number of double-blind, ...
Cilurzo Francesco - - 2005
The effects of electron beam or gamma-irradiation on technological performances (capsule hardness, expressed as deforming work and dissolution time) of empty 2-shell capsules made of gelatin or hydroxypropylmethylcellulose (HPMC) were studied. Capsule structural changes induced by radiation treatment were investigated by capillary viscometry and atomic force microscopy (AFM). The capsules ...
Bai F W - - 2004
The quasi-steady-states, marked by small fluctuations of residual glucose, ethanol, and biomass concentrations, and sustainable oscillations marked by big fluctuations of these monitored fermentation parameters were observed during the continuous ethanol fermentation of Saccharomyces cerevisiae when very high gravity media were fed and correspondingly high ethanol concentrations reached. A high ...
Min Booki - - 2004
A microbial fuel cell (MFC) is a device that converts organic matter to electricity using microorganisms as the biocatalyst. Most MFCs contain two electrodes separated into one or two chambers that are operated as a completely mixed reactor. In this study, a flat plate MFC (FPMFC) was designed to operate ...
Muriana Peter - - 2004
Surface pasteurization for inactivation of Listeria monocytogenes was evaluated for radiant heat prepackage pasteurization, submersed water postpackage pasteurization, and combinations of the two techniques on various types of ready-to-eat deli turkey products obtained from at least four different manufacturers. Products were inoculated either by in-package liquid inoculum or surface sponge-contact ...
Green M - - 2004
The aim of this research was to investigate the feasibility of treating liquid dairy wastes by a vertical bed equipped with an innovative passive aeration system. The vertical bed (32 liter) was operated by recirculating consecutive batches of liquid waste in the column. Batches of liquid waste were applied at ...
Williams Malcolm I - - 2004
The objective of this randomized, crossover study was to compare the effectiveness of a newly designed manual toothbrush (Colgate 360 degrees) to two commercially available manual toothbrushes (Oral-B Indicator and Oral-B CrossAction) and a battery-powered toothbrush (Crest SpinBrush PRO) for their ability to reduce hydrogen-sulfide-forming bacteria on the tongue. After ...
Safferman Steven I - - 2004
The need to improve on-site wastewater treatment processes is being realized as populations move into more environmentally sensitive regions and regulators adopt the total maximum daily load approach to watershed management. Under many conditions, septic systems do not provide adequate treatment; therefore, advanced systems are required. These systems must remove ...
Xu Xinhua - - 2004
Electro-coagulation was used to treat refectory wastewater with high oil and grease contents. Different operational conditions were examined, including pH, current density, reaction time, conductivity, electrode distance and inlet concentration. The optimum current density was 10-14 A m(-2) within 30 min depending on the wastewater properties tested. Conductivity had little ...
Trombelli L - - 2004
Evidence indicates that incisor crown form correlates with clinical periodontal features. It was hypothesized that incisor crown form may explain subject differences in gingivitis expression. The present experimental gingivitis study aimed to assess the effect of incisor crown form on plaque accumulation and gingival inflammation, and on individual susceptibility to ...
Nikawa H - - 2004
The effect of Lactobacillus reuteri against one of the major cariogenic organism, Streptococcus mutans, was studied. Yogurt products containing L.reuteri showed a significant growth inhibitory effect against S. mutans, whilst yoghurts with lactobaccilli other than L. reuteri did not show such inhibition. Further, double-blind, placebo-controlled trial demonstrated that consuming yogurt ...
Massieux B - - 2004
We investigated the effects of copper on the structure and physiology of freshwater biofilm microbial communities. For this purpose, biofilms that were grown during 4 weeks in a shallow, slightly polluted ditch were exposed, in aquaria in our laboratory, to a range of copper concentrations (0, 1, 3, and 10 ...
Narihiro T - - 2004
Microbial populations in terms of quantity, quality, and activity were monitored during 2 months of start-up operation of commercially available composters for fed-batch treatment of household biowaste. All the reactors, operated at a waste-loading rate of 0.7 kg day(-1) (wet wt), showed a mass reduction efficiency of 88-93%. The core ...
Zhelev Zhivko - - 2004
The present study describes an impressive enhancement of the photoluminescence (PL) intensity of low-temperature synthesized CdSe nanocrystals (75 degrees C) during long-term UV-irradiation. The integrated PL-intensity of CdSe core and CdSe/ZnS core/shell nanocrystals, dispersed in chloroform, enhanced about 3 and 6 times, respectively, during 9 h exposure to UV-light, without ...
Bouchez J C - - 2004
This article describes a new method for the early detection of alcoholic fermentation arrest. This methodology is based on the flow cytometric assessment of Saccharomyces cerevisiae yeasts stained with a carboxyfluorescein diacetate fluorescent viability probe. Multicomponent analysis of viable cell distribution constitutes a promising new tool to describe physiological and ...
DoliƄiska Romualda - - 2004
Grains of the Polish winter wheat variety Begra were subjected to gamma-radiation (grain harvested in 1996) within the dose range of 0.05-10 kGy and microwave heating (grain harvested in 1997) from 28 degrees C to 98 degrees C. Later the grains were divided into two parts, the first was used ...
Schmidt Torsten C - - 2004
The fate of fuel oxygenates such as methyl tert-butyl ether (MTBE) in the subsurface is governed by their degradability under various redox conditions. The key intermediate in degradation of MTBE and ethyl tert-butyl ether (ETBE) is tert-butyl alcohol (TBA) which was often found as accumulating intermediate or dead-end product in ...
Hall Mary B - - 2004
Current prediction equations were used to evaluate the effects of rates of fermentation of fiber or starch in individual feeds on amounts of carbohydrate fermented ruminally and milk yield responses. The small predicted increases in carbohydrate fermented and milk response associated with doubling the rates of fermentation suggest that current ...
Okunuki Suguru - - 2004
A lab-scale-enhanced biological phosphorus removal (EBPR) reactor was operated for 204 days to investigate the correlation between phosphorus removing performance and bacterial community structure. The phosphorus removing performance was good from day 1 to 92 and from day 172 to 204. However, the removal activity was in a deteriorated state ...
Ren Zhen - - 2004
OBJECTIVE: This investigation was done in order to find optimal indocyanine green (ICG) concentration and energy irradiance in laser vascular welding. BACKGROUND DATA: Many studies have shown that laser tissue welding with albumin solder/ICG may be an effective technique in surgical reconstruction. However, there are few reports regarding optimal laser ...
Maskow Thomas - - 2004
The microbial conversion of toxic substrates into valuable products in continuous culture requires the equivalent of a tight rope walk between formation of the desired product and intoxication of the microbial catalyst. The condition of the latter is reflected immediately by changes in heat flow rate and beta-dispersion in an ...
Sari Emel - - 2004
The purpose of this study was to examine the effects of 2 different anti-inflammatory drugs on gingival crevicular fluid (GCF) volume and on prostaglandin E(2) (PGE(2)) levels of the GCF during orthodontic tooth movement. A total of 36 extraction patients, aged 17.6 +/- 2.5 years (mean +/- standard deviation), were ...
Mah James - - 2004
External apical root resorption is a common, yet unexplained, phenomenon associated with orthodontic treatment. Available methods of clinical evaluation are radiographic. Biochemical assays offer the advantage of being non-invasive, as well as being diagnostic and potentially prognostic. The hypotheses are firstly that during the process of root resorption, organic matrix ...
Häder Donat-P - - 2004
The filamentous rhodophytes Callithamnion gaudichaudi Agardh and Ceramium sp. were utilized to study the effects of solar radiation (PAR, 400-700 nm, UV-B, 280-315 nm and UV-A, 315-400 nm) on the photosynthetic performance in situ in Patagonia waters (Argentina). A pulse amplitude modulated (PAM) fluorometer was used to determine the fluorescence ...
Walters Patricia A - - 2004
PURPOSE: This study was designed to examine the ability of sodium hexametaphosphate delivered from a chewing gum to prevent extrinsic tooth stain formation. METHODS: This study was a negative-controlled, randomized, two-period crossover design, with a 10-day washout period between treatments. The two treatments were a chewing gum containing 5.6% sodium ...
Ahn Y H - - 2004
The performance of a novel high-rate anaerobic process, the anaerobic digestion elutriated phased treatment (ADEPT) process, for treating a slurry-type piggery waste (55 g COD/L and 37 g TS/L) was investigated. The ADEPT process consists of an acid elutriation slurry reactor for hydrolysis and acidification, followed by an upflow anaerobic ...
Halla-Júnior Ronald - - 2004
PURPOSE: This study aimed to evaluate the effect of flossing on the presence of plaque and gingivitis in school students undertaking supervised oral hygiene. MATERIALS AND METHODS: Thirty-three non-users of dental floss were selected from a larger panel. The study had a preliminary phase of 21 days, followed by two ...
Seo G T - - 2004
A pilot scale experiment was conducted to evaluate the performance of a membrane bioreactor filled with high concentration powdered activated carbon. This hybrid system has great potential to substitute for existing GAC or O3/BAC processes in the drinking water treatment train. The system was installed at a water treatment plant ...
Kim S M - - 2004
In order to enhance the solid-liquid separation properties and nitrogen removal efficiency of SBR, the aerobic floc-like granules were cultivated under temporal alternating aerobic and anoxic conditions without the presence of carrier material in a SBR having 15 H/D (height/diameter) ratio. Two different effluent port positions were applied to the ...
Li Z - - 2004
This paper aims to evaluate the curative effects of low-intensity laser external radiotherapy through thermal texture mapping (TTM) technology. The influences of 30 min nasal cavity irradiation of semiconductor laser (650 nm, 5 mW, continuous wave) on microcirculation were investigated through TTM. At the same time, with the aid of ...
Novaes Júnior Arthur Belém - - 2004
Gingival inflammation is clinically characterized by gingival redness, swelling and increased tendency of bleeding of the soft tissue. Bacterial biofilm is the etiological agent. If, at this stage, the bacterial biofilm is removed and appropriate control methods are applied, remission of gingival inflammation occurs. This study evaluated the effectiveness of ...
Borges A C - - 2004
The effect of the filling stage on the behavior of a mechanically stirred anaerobic sequencing batch reactor containing biomass immobilized on 1 cm polyurethane foam cubes was investigated. The reactor was made of acrylic with a capacity of 6.3 L, treating per cycle 2.5 L synthetic low-strength wastewater with a ...
Manios Thrassyvoulos - - 2004
Shredded green wastes were composted in windrows, at the Harewood Whin landfill, near the city of York, in West Yorkshire, UK. Landfill leachate were added twice during the second and fourth week of the process in two piles. One pile was turned once every week for eight weeks and the ...
Jinadasa K B S N - - 2004
Anaerobic Toxicity Assay (ATA) tests were conducted on acidogenic cultures to assess the feasibility of using acidogenic processes to treat wastewaters containing 2-nitrophenol. Results indicated 2-nitrophenol could be removed with a removal efficiency of more than 98%. 2-aminophenol was identified as the major metabolite of the biotransformation of 2-nitrophenol. Reduction ...
Cho E S - - 2004
The effects of sequentially combined carbon (SCC) using a symbiotic relationship of methanol and acetic acid on biological nutrient removal were investigated in both the continuous bench scale process consisting of an anoxic, an aerobic and a final settling tank and intensive batch tests. Compared to the use of respective ...
Sreenivasan P K - - 2004
A randomized and cross-over design clinical study with normal adult volunteers examined the effects of a 0.12% chlorhexidine (CHX) mouthrinse and a control rinse on a range of microflora including those implicated in halitosis on the tongue and saliva. Saliva and tongue scrapings were collected from 13 subjects prior to ...
Mahrour A - - 2003
Chicken legs were subjected to two pretreatments (packaged in air or marinated in natural plant extracts and then packaged in air) followed by irradiation (0, 3, or 5 kGy). The control and irradiated chicken legs were stored at 4 degrees C and underwent microbial analysis (mesophilic aerobic plate counts and ...
Rodrigues José Alberto Domingues - - 2003
This work presents an analysis of a stirred anaerobic sequencing discontinuous reactor with different substrate feeding strategies resulting in batch, fed-batch/batch and fed-batch operating modes. The reactor, containing granulated biomass, was fed with approximately 2.0L of synthetic domestic wastewater with Chemical Oxygen Demand of nearly 500 mg/L per cycle and ...
Torres S R SR Department of Oral Pathology and Oral Diagnostic, School of Dentistry, Universidade Federal do Rio de Janeiro, Brazil. - - 2003
In order to investigate the clinical factors that might influence the diversity and the degree of Candida species carriage in saliva, we conducted a cross-sectional study with 133 patients with complaints of xerostomia. Anamnesis, oral examination and collection of chewing-stimulated whole saliva were performed. The samples of saliva were kept ...
Foucault-Bertaud A - - 2003
The aim of this study was to determine if a vegetable extract from seeds of Lupinus albus (LU 105) has the capacity to inhibit human leukocyte elastase and/or protect gingival elastic fibers against proteolytic degradation. LU105 was extracted from seeds of L albus and is freely soluble in water. In ...
Steer Toni E - - 2003
The isoflavone genistein is found predominantly in soybeans and is thought to possess various potent biological properties, including anti-carcinogenic effects. Studies have shown that genistein is extensively degraded by the human gut microflora, presumably with a loss of its anti-carcinogenic action. The aim of the present study was to investigate ...
Newman Seth A - - 2003
BACKGROUND: Enamel matrix derivative (EMD) is used during periodontal surgery for the regeneration of periodontal tissue. It consists of the amelogenin fraction of porcine enamel matrix (AMEL) suspended in a vehicle of propylene glycol alginate (PGA). EMD-treated sites appear to heal with less inflammation. It has been suggested that antimicrobial ...
< 1 2 3 4 5 6 7 8 9 10 11 >