Image
WTS Database
The subject of interest is:
waterpipe, water-pipe, nargile, narghile, arguileh, arguile, shisha, sheesha, chichi, hubble bubble, hubbly bubbly, goza, hookah, bong
| Title | Pub Year | Author | SearchLink Sort descending |
|---|---|---|---|
| Susceptibility of restorative materials to staining by common beverages: an in vitro study | 2007 | Faculty of Dentistry, Mansoura University, Mansoura, Egypt. neveenmokhtar@yahoo.com | Read more... |
|
Source Type
Print(0)
Ref Type
Journal Article
Periodical, Full
The European journal of esthetic dentistry : official journal of the European Academy of Esthetic Dentistry
Periodical, Abbrev.
Eur.J.Esthet.Dent.
Pub Date Free Form
Summer
Volume
2
Issue
2
Start Page
236
Other Pages
247
Notes
LR: 20151119; JID: 101285292; 0 (Coffee); 0 (Compomers); 0 (Composite Resins); 0 (Dental Materials); 0 (Glass Ionomer Cements); 0 (Organically Modified Ceramics); 0 (Resin Cements); 0 (Silanes); 0 (Tea); 059QF0KO0R (Water); ppublish
Place of Publication
Germany
ISSN/ISBN
1862-0612; 1862-0612
Accession Number
PMID: 19655568
Language
eng
SubFile
Journal Article; D; IM
DOI
Output Language
Unknown(0)
PMID
19655568
Abstract
The purpose of this study was to determine the staining potential of glass-ionomer and composite resin restorative materials following immersion in common beverages. Nine tooth-colored restorative materials were used: three glass ionomers (ceramic-reinforced, resin-modified, and conventional) and six composite resins (nanofilled, ormocer-based, flowable ormocer-based, polyacid-modified, microhybrid, and flowable microhybrid). Disk-shaped specimens were prepared and immersed in 37 degrees C distilled water for 24 hours. Over a 2-week period, five specimens of each material were immersed daily in one of three test beverages (coffee, tea, or cola), then stored in distilled water. A control group of five specimens of each material was continuously immersed in distilled water during the test period. Color coefficients (CIE Lab) were measured by a spectrophotometer before and after staining. All materials were susceptible to staining by all test beverages, while distilled water caused no perceptible color change. As determined by ANOVA and Bonferroni tests, there were highly significant differences in the change in color (deltaE) for tested materials in different beverages (P < or = .001). The deltaE was significantly higher for coffee and tea than for cola; the deltaE was significantly higher for the polyacid-modified composite resin than for all other materials. The material with the least amount of color change in coffee and tea was the ceramic-reinforced glass ionomer (deltaE = 12.45 and 10.64, respectively) and in cola was the nanofilled composite resin (deltaE = 1.93).
Descriptors
Beverages, Carbonated Beverages, Ceramics/chemistry, Coffee, Color, Compomers/chemistry, Composite Resins/chemistry, Dental Materials/chemistry, Glass Ionomer Cements/chemistry, Humans, Immersion, Materials Testing, Nanocomposites/chemistry, Organically Modified Ceramics, Resin Cements/chemistry, Silanes/chemistry, Spectrophotometry, Surface Properties, Tea, Temperature, Time Factors, Water/chemistry
Links
Book Title
Database
Publisher
Data Source
Authors
Ayad,N. M.
Original/Translated Title
URL
Date of Electronic
PMCID
Editors
|
|||
| High extraction efficiency for polar aromatic compounds in natural water samples using multiwalled carbon nanotubes/Nafion solid-phase microextraction coating | 2009 | Department of Chemistry and the Key Laboratory of Analytical Sciences of the Ministry of Education, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China. | Read more... |
|
Source Type
Print(0)
Ref Type
Journal Article
Periodical, Full
Journal of chromatography.A
Periodical, Abbrev.
J.Chromatogr.A
Pub Date Free Form
25-Dec
Volume
1216
Issue
52
Start Page
9143
Other Pages
9148
Notes
JID: 9318488; 0 (Hydrocarbons, Aromatic); 0 (Nanotubes, Carbon); 0 (Water Pollutants, Chemical); 2009/04/20 [received]; 2009/06/25 [revised]; 2009/07/14 [accepted]; 2009/07/18 [aheadofprint]; ppublish
Place of Publication
Netherlands
ISSN/ISBN
1873-3778; 0021-9673
Accession Number
PMID: 19660762
Language
eng
SubFile
Evaluation Studies; Journal Article; Research Support, Non-U.S. Gov't; IM
DOI
10.1016/j.chroma.2009.07.025 [doi]
Output Language
Unknown(0)
PMID
19660762
Abstract
A novel solid-phase microextraction (SPME) fiber coated with multiwalled carbon nanotubes (MWCNTs)/Nafion was developed and applied for the extraction of polar aromatic compounds (PACs) in natural water samples. The characteristics and the application of this fiber were investigated. Electron microscope photographs indicated that the MWCNTs/Nafion coating with average thickness of 12.5microm was homogeneous and porous. The MWCNTs/Nafion coated fiber exhibited higher extraction efficiency towards polar aromatic compounds compared to an 85microm commercial PA fiber. SPME experimental conditions, such as fiber coating, extraction time, stirring rate, desorption temperature and desorption time, were optimized in order to improve the extraction efficiency. The calibration curves were linear from 0.01 to 10microgmL(-1) for five PACs studied except p-nitroaniline (from 0.005 to 10microgmL(-1)) and m-cresol (from 0.001 to 10microgmL(-1)), and detection limits were within the range of 0.03-0.57ngmL(-1). Single fiber and fiber-to-fiber reproducibility were less than 7.5 (n=7) and 10.0% (n=5), respectively. The recovery of the PACs spiked in natural water samples at 1microgmL(-1) ranged from 83.3 to 106.0%.
Descriptors
Adsorption, Hydrocarbons, Aromatic/chemistry, Limit of Detection, Nanotubes, Carbon/chemistry, Solid Phase Microextraction/instrumentation/methods, Water Pollutants, Chemical/chemistry
Links
Book Title
Database
Publisher
Data Source
Authors
Chen,W., Zeng,J., Chen,J., Huang,X., Jiang,Y., Wang,Y., Chen,X.
Original/Translated Title
URL
Date of Electronic
20090718
PMCID
Editors
|
|||
| Surveillance in Barrett's esophagus: an audit of practice | 2010 | Internal Medicine, Loma Linda Veterans Health Care System, Loma Linda, CA 92357, USA. adewaleajums@yahoo.com | Read more... |
|
Source Type
Print(0)
Ref Type
Journal Article
Periodical, Full
Digestive diseases and sciences
Periodical, Abbrev.
Dig.Dis.Sci.
Pub Date Free Form
Jun
Volume
55
Issue
6
Start Page
1615
Other Pages
1621
Notes
JID: 7902782; 2009/03/03 [received]; 2009/07/09 [accepted]; 2009/08/11 [aheadofprint]; ppublish
Place of Publication
United States
ISSN/ISBN
1573-2568; 0163-2116
Accession Number
PMID: 19669878
Language
eng
SubFile
Journal Article; AIM; IM
DOI
10.1007/s10620-009-0917-y [doi]
Output Language
Unknown(0)
PMID
19669878
Abstract
GOALS: Determine the rates of follow-up, incident rate of cancer during surveillance, and changes in pathologic grade of patients with Barrett's esophagus during surveillance in a gastroenterology practice without a formal surveillance program. BACKGROUND: Barrett's esophagus is a pre-malignant condition. Surveillance endoscopy (SE) is recommended in order to detect and treat high-grade dysplasia and esophageal adenocarcinoma early and prevent deaths. SE has not been shown to have mortality benefit and several studies have questioned its cost-effectiveness. Most gastroenterology practices do not have a surveillance program for Barrett's esophagus. The few that exist are only in very specialized and funded programs. Little information exists on outcomes in patients with Barrett's esophagus outside of these well-structured surveillance programs. STUDY: A retrospective analysis of a cohort of patients with Barrett's esophagus diagnosed and surveyed between 1995 and 2005 at a Veterans Affairs medical center. Data were collected on age, body mass index, and race. Patients who missed their SE by 6 months or more and those that missed their SE by twice the recommended intervals or more were identified and analyzed for changes in pathologic grades. RESULTS: A total of 472 patients were diagnosed with Barrett's esophagus or had SE between 1995 and 2005. Three hundred and five patients only had one endoscopy and biopsy. They did not have follow-up surveillance endoscopies and biopsies. Two patients were excluded from the final analysis: one had an esophagectomy after an index diagnosis of high-grade dysplasia, and one had a diagnosis of esophageal adenocarcinoma 2 days after an initial impression of Barrett's esophagus. There were 165 patients with Barrett's metaplasia or dysplasia who had SE more than once and were included in the final analysis. Overall, 53.3% had no change in pathologic grade, 35.2% regressed to a lower pathologic grade, and 11.5% progressed to a higher grade. None (0/165, 0%) progressed to esophageal adenocarcinoma; 3.6% (6/165) progressed to high-grade dysplasia and 11.5% (19/165) regressed to normal mucosa. Forty-four patients missed their SE by 6 months or more. Of these, 50% regressed, 40.9% had no change, and 9.1% progressed. Four patients regressed to normal mucosa, one progressed to high-grade dysplasia and none progressed to esophageal adenocarcinoma. Twenty-three patients missed their SE by twice the recommended intervals or more. Of these, 60.9% regressed, 34.8% did not change, and 4.3% progressed. None progressed to esophageal adenocarcinoma or high-grade dysplasia but three regressed to normal mucosa. After adjusting for age and body mass index, patients with low-grade dysplasia are nearly seven times more likely to miss their endoscopy by twice the recommended intervals or more (OR 6.56, P-value 0.03). CONCLUSIONS: Most veteran patients with Barrett's esophagus do not undergo surveillance endoscopies. Veteran patients with Barrett's esophagus undergoing SE rarely progress to high-grade dysplasia or esophageal adenocarcinoma. Veteran patients with Barrett's esophagus who have longer SE up to twice the recommended intervals because they missed their scheduled SE did not have a worse outcome when compared to the general Barrett's esophagus surveillance group. Veteran patients with low-grade dysplasia are most likely to miss their SE by twice the recommended intervals or more, though the reason for this is unknown.
Descriptors
Aged, Barrett Esophagus/diagnosis/epidemiology/pathology, Biopsy, Disease Progression, Esophageal Neoplasms/diagnosis/epidemiology/pathology, Esophagoscopy/utilization, Female, Humans, Incidence, Logistic Models, Male, Mass Screening/methods/utilization, Medical Audit, Middle Aged, Patient Acceptance of Health Care, Precancerous Conditions/diagnosis/epidemiology/pathology, Predictive Value of Tests, Retrospective Studies, Time Factors, United States/epidemiology, United States Department of Veterans Affairs
Links
Book Title
Database
Publisher
Data Source
Authors
Ajumobi,A., Bahjri,K., Jackson,C., Griffin,R.
Original/Translated Title
URL
Date of Electronic
20090811
PMCID
Editors
|
|||
| Does the availability of single cigarettes promote or inhibit cigarette consumption? Perceptions, prevalence and correlates of single cigarette use among adult Mexican smokers | 2009 | Department of Health Promotion, Education and Behavior, Arnold School of Public Health, University of South Carolina, Columbia, SC 29208, USA. thrasher@mailbox.sc.edu | Read more... |
|
Source Type
Print(0)
Ref Type
Journal Article
Periodical, Full
Tobacco control
Periodical, Abbrev.
Tob.Control
Pub Date Free Form
Dec
Volume
18
Issue
6
Start Page
431
Other Pages
437
Notes
LR: 20141207; GR: P50 CA111236/CA/NCI NIH HHS/United States; GR: RA25-CA57699/CA/NCI NIH HHS/United States; JID: 9209612; OID: NLM: PMC2778078; 2009/08/10 [aheadofprint]; ppublish
Place of Publication
England
ISSN/ISBN
1468-3318; 0964-4563
Accession Number
PMID: 19671535
Language
eng
SubFile
Journal Article; Research Support, N.I.H., Extramural; Research Support, Non-U.S. Gov't; IM
DOI
10.1136/tc.2008.029132 [doi]
Output Language
Unknown(0)
PMID
19671535
Abstract
BACKGROUND: Single cigarette use and its implications have rarely been studied among adults. OBJECTIVE: To assess perceptions, prevalence and correlates of single cigarette purchase behaviour and its relation to harm reduction. DESIGN: Focus group transcripts and cross-sectional data were analysed. SETTING AND PARTICIPANTS: Focus groups among convenience samples of adult smokers in two Mexican cities and a population-based sample of 1079 adult smokers from the International Tobacco Control Policy Evaluation Project in four Mexican cities. MAIN OUTCOME MEASURES: Purchase of single cigarettes last time cigarettes were bought, frequency of purchasing single cigarettes in the previous month and intention to quit in the next 6 months. RESULTS: Focus group data indicated that smokers bought single cigarettes as a harm reduction strategy. Survey data indicated that 38% of participants purchased single cigarettes in the last month and 10% purchased them the last time they bought cigarettes, with more frequent consumption among young adults and those with lower income. Purchasing single cigarettes was independently associated with the frequency of using single cigarettes to reduce consumption and, less consistently, with the frequency of being cued to smoke after seeing single cigarettes for sale. Using single cigarettes to reduce consumption was positively associated with quit intention, whereas being cued to smoke by single cigarettes was negatively associated with quit intention. CONCLUSIONS: Study results suggest that some adult Mexican smokers purchase single cigarettes as a method to limit, cut down on and even quit smoking. Nevertheless, promotion of the availability of single cigarettes as a harm reduction strategy could provide additional smoking cues that undermine quit attempts and promote youth smoking.
Descriptors
Adult, Aged, Commerce, Cues, Female, Focus Groups, Humans, Intention, Male, Mexico, Middle Aged, Smoking/economics/prevention & control/psychology, Smoking Cessation/methods/psychology, Young Adult
Links
Book Title
Database
Publisher
Data Source
Authors
Thrasher,J. F., Villalobos,V., Dorantes-Alonso,A., Arillo-Santillan,E., Cummings,K. M., O'Connor,R., Fong,G. T.
Original/Translated Title
URL
Date of Electronic
20090810
PMCID
PMC2778078
Editors
|
|||
| Association of passive exposure of pregnant women to environmental tobacco smoke with asthma symptoms in children | 2009 | Allergy Department, 2nd Pediatric Clinic, University of Athens, 13 Levadias str., Goudi 11527, Greece. panvik@hol.gr | Read more... |
|
Source Type
Print(0)
Ref Type
Journal Article
Periodical, Full
Pediatric allergy and immunology : official publication of the European Society of Pediatric Allergy and Immunology
Periodical, Abbrev.
Pediatr.Allergy Immunol.
Pub Date Free Form
Aug
Volume
20
Issue
5
Start Page
423
Other Pages
429
Notes
LR: 20151119; JID: 9106718; 0 (Tobacco Smoke Pollution); ppublish
Place of Publication
England
ISSN/ISBN
1399-3038; 0905-6157
Accession Number
PMID: 19674350
Language
eng
SubFile
Journal Article; IM
DOI
10.1111/j.1399-3038.2008.00820.x [doi]
Output Language
Unknown(0)
PMID
19674350
Abstract
Environmental tobacco smoke (ETS) is a significant risk factor for the presence and increased severity of asthma- and allergy-related symptoms in children. Smoking during pregnancy has detrimental effects on asthma-associated outcomes in childhood. Whether passive exposure of pregnant women to ETS may also lead to asthma in their offspring, is not known. The aim of this study was to investigate the association of passive exposure of pregnant women to ETS and asthma- and/or allergy-related symptoms in Preschool children. Cross-sectional data were collected with questionnaires from 2374 Preschool children, recruited from public and private nurseries and day-care centers. Parental smoking was significantly associated with wheezing symptoms in their children. Mother's active smoking during pregnancy significantly increased the risk for occurrence of asthma symptoms and/or medically diagnosed asthma in Preschool children in a dose-dependent manner. Passive exposure to ETS, mainly during the third trimester of pregnancy, was significantly associated with asthma- and allergy-related symptoms after adjusting for several confounders in a multivariate analysis (current wheeze: OR = 1.42, 95% CI = 1.06-1.91, pruritic rash ever: OR= 1.45, 95% CI = 1.01-2.08). Passive exposure of pregnant women to ETS during the third trimester is positively associated with asthma- and allergy-related symptoms in their Preschool age children. Public health policies should be oriented not only towards smoking cessation, but also reinforce elimination of ETS exposure of pregnant women.
Descriptors
Asthma/diagnosis/etiology, Child, Child, Preschool, Environmental Exposure/adverse effects, Female, Humans, Infant, Male, Pregnancy, Pregnancy Trimester, Third, Prenatal Exposure Delayed Effects, Respiratory Sounds, Risk Factors, Smoking/adverse effects, Surveys and Questionnaires, Tobacco Smoke Pollution/adverse effects
Links
Book Title
Database
Publisher
Data Source
Authors
Xepapadaki,P., Manios,Y., Liarigkovinos,T., Grammatikaki,E., Douladiris,N., Kortsalioudaki,C., Papadopoulos,N. G.
Original/Translated Title
URL
Date of Electronic
PMCID
Editors
|
|||
| Ultrasound-assisted emulsification microextraction method based on applying low density organic solvents followed by gas chromatography analysis for the determination of polycyclic aromatic hydrocarbons in water samples | 2009 | Department of Chemistry, Tarbiat Modares University, P.O. Box 14115-175, Tehran, Iran. | Read more... |
|
Source Type
Print(0)
Ref Type
Journal Article
Periodical, Full
Journal of chromatography.A
Periodical, Abbrev.
J.Chromatogr.A
Pub Date Free Form
25-Sep
Volume
1216
Issue
39
Start Page
6673
Other Pages
6679
Notes
JID: 9318488; 0 (Organic Chemicals); 0 (Polycyclic Hydrocarbons, Aromatic); 0 (Solvents); 0 (Water Pollutants, Chemical); 2009/06/01 [received]; 2009/07/30 [revised]; 2009/08/04 [accepted]; 2009/08/07 [aheadofprint]; ppublish
Place of Publication
Netherlands
ISSN/ISBN
1873-3778; 0021-9673
Accession Number
PMID: 19674752
Language
eng
SubFile
Evaluation Studies; Journal Article; IM
DOI
10.1016/j.chroma.2009.08.001 [doi]
Output Language
Unknown(0)
PMID
19674752
Abstract
In this study, a fast, simple and efficient ultrasound-assisted emulsification microextraction (USAEME) method was successfully developed based on applying low density organic solvents. Fourteen microliters of toluene was injected slowly into a 12 mL home-designed centrifuge glass vial containing an aqueous sample that was located inside the ultrasonic water bath. The formed emulsion was centrifuged and 2 microL of separated toluene (about 4 microL) was injected into a gas chromatographic system equipped with a flame ionization detector (GC-FID) for analysis. Some polycyclic aromatic hydrocarbons (PAHs) were selected as model compounds for developing the method and evaluating its performance and to compare the efficiency of the proposed method with previously reported techniques. Several factors influencing the emulsification, extraction and collection efficiency such as the nature and volume of organic solvent, emulsification-extraction temperature, ionic strength and equilibrium and centrifugation times were investigated and optimized. Under the optimum conditions, preconcentration factors (PFs) in a range of 1776-2714 were obtained. The performance of the proposed method was studied in terms of linear dynamic range (LDRs from 0.05 to 100 microg L(-1)), linearity (R(2) > or = 0.994), precision (repeatability: RSD% < or = 7.9, reproducibility: RSD% < or = 14.6) and extraction percents (59.2-90.5%). Limits of detection (LODs) in the range of 0.02-0.05 microg L(-1) were obtained for different PAHs. The applicability of the proposed method was evaluated by the extraction and determination of PAHs from several natural water samples.
Descriptors
Chemical Fractionation/methods, Chromatography, Gas, Organic Chemicals/chemistry, Polycyclic Hydrocarbons, Aromatic/analysis, Solvents/chemistry, Ultrasonics, Water Pollutants, Chemical/analysis
Links
Book Title
Database
Publisher
Data Source
Authors
Saleh,A., Yamini,Y., Faraji,M., Rezaee,M., Ghambarian,M.
Original/Translated Title
URL
Date of Electronic
20090807
PMCID
Editors
|
|||
| Indoor concentrations of nicotine in low-income, multi-unit housing: associations with smoking behaviours and housing characteristics | 2009 | Department of Environmental Health, Harvard School of Public Health, Boston, MA 02215, USA. | Read more... |
|
Source Type
Print(0)
Ref Type
Journal Article
Periodical, Full
Tobacco control
Periodical, Abbrev.
Tob.Control
Pub Date Free Form
Dec
Volume
18
Issue
6
Start Page
438
Other Pages
444
Notes
LR: 20151119; GR: 1 R01 CA111310-01A1/CA/NCI NIH HHS/United States; JID: 9209612; 0 (Tobacco Smoke Pollution); 6M3C89ZY6R (Nicotine); 2009/08/13 [aheadofprint]; ppublish
Place of Publication
England
ISSN/ISBN
1468-3318; 0964-4563
Accession Number
PMID: 19679890
Language
eng
SubFile
Journal Article; Research Support, N.I.H., Extramural; IM
DOI
10.1136/tc.2009.029728 [doi]
Output Language
Unknown(0)
PMID
19679890
Abstract
OBJECTIVE: An analysis of airborne nicotine measurements collected in 49 low-income, multi-unit residences across the Greater Boston Area. METHODS: Nicotine concentrations were determined using passive monitors placed in homes over a one-week sampling period and air exchange rates (AER) were sampled using the perfluorocarbon tracer technique. Residents were surveyed through a questionnaire about smoking behaviour and a visual inspection was conducted to collect information on housing characteristics contributing to secondhand smoke (SHS) exposure. Using a mass balance model to account for the air exchange rate, volume of the home and sorption and re-emission of nicotine on indoor surfaces, the effective smoking rate (SR(eff)) was determined for each residence. RESULTS: Nicotine levels ranged from the limit of detection to 26.92 microg/m(3), with a mean of 2.20 microg/m(3) and median of 0.13 microg/m(3). Nicotine measurements were significantly associated with the number of smokers in the household and the number of cigarettes smoked in the home. The results of this study suggest that questionnaire reports can provide a valid estimate of residential exposure to tobacco smoke. In addition, this study found evidence that tobacco smoke contamination in low-income housing developments is not limited to homes with smokers (either residing in the home or visiting). The frequent report of tobacco smoke odour coming from other apartments or hallways resulted in increased levels of nicotine concentrations and SR(eff) in non-smoking homes, suggestive of SHS infiltration from neighbouring units. CONCLUSION: These findings have important implications for smoking regulations in multi-unit homes and highlight the need to reduce involuntary exposure to tobacco smoke among low-income housing residents.
Descriptors
Adult, Aged, Air Pollution, Indoor/analysis, Boston/epidemiology, Environmental Exposure/analysis, Environmental Monitoring/methods, Epidemiological Monitoring, Female, Housing/statistics & numerical data, Humans, Male, Middle Aged, Nicotine/analysis, Poverty Areas, Smoking/epidemiology, Tobacco Smoke Pollution/analysis
Links
Book Title
Database
Publisher
Data Source
Authors
Kraev,T. A., Adamkiewicz,G., Hammond,S. K., Spengler,J. D.
Original/Translated Title
URL
Date of Electronic
20090813
PMCID
Editors
|
|||
| Effect of acid etching duration on tensile bond strength of composite resin bonded to erbium:yttrium-aluminium-garnet laser-prepared dentine. Preliminary study | 2010 | Department of Dental Sciences, Faculty of Medicine, University of Liege, Quai Godfroid Kurth, 45, 4000, Liege, Belgium. | Read more... |
|
Source Type
Print(0)
Ref Type
Journal Article
Periodical, Full
Lasers in medical science
Periodical, Abbrev.
Lasers Med.Sci.
Pub Date Free Form
Nov
Volume
25
Issue
6
Start Page
855
Other Pages
859
Notes
LR: 20151119; JID: 8611515; 0 (Composite Resins); 2009/01/12 [received]; 2009/07/15 [accepted]; 2009/08/15 [aheadofprint]; ppublish
Place of Publication
England
ISSN/ISBN
1435-604X; 0268-8921
Accession Number
PMID: 19685196
Language
eng
SubFile
Comparative Study; Evaluation Studies; Journal Article; IM
DOI
10.1007/s10103-009-0719-7 [doi]
Output Language
Unknown(0)
PMID
19685196
Abstract
The purpose of this study was to compare the tensile bond strength of composite resin bonded to erbium:yttrium-aluminium-garnet (Er:YAG) laser-prepared dentine after different durations of acid etching. The occlusal third of 68 human third molars was removed in order to expose the dentine surface. The teeth were randomly divided into five groups: group B (control group), prepared with bur and total etch system with 15 s acid etching [37% orthophosphoric acid (H(3)PO(4))]; group L15, laser photo-ablated dentine (200 mJ) (laser irradiation conditions: pulse duration 100 micros, air-water spray, fluence 31.45 J/ cm(2), 10 Hz, non-contact hand pieces, beam spot size 0.9 mm, irradiation speed 3 mm/s, and total irradiation time 2 x 40 s); group L30, laser prepared, laser conditioned and 30 s acid etching; group L60, laser prepared, laser conditioned and 60 s acid etching; group L90, laser prepared, laser conditioned and 90 s acid etching. A plot of composite resin was bonded onto each exposed dentine and then tested for tensile bond strength. The values obtained were statistically analysed by analysis of variance (ANOVA) coupled with the Tukey-Kramer test at the 95% level. A 90 s acid etching before bonding showed the best bonding value (P < 0.05) when compared with all the other groups including the control group. There is no significance difference between other groups, nor within each group and the control group. There was a significant increase in tensile bond strength of the samples acid etched for 90 s.
Descriptors
Acid Etching, Dental/methods, Composite Resins, Dental Bonding/methods, Dental Etching/methods, Dental Stress Analysis, Dentin/physiology/radiation effects, Humans, In Vitro Techniques, Lasers, Solid-State/therapeutic use, Low-Level Light Therapy/methods, Tensile Strength, Time Factors
Links
Book Title
Database
Publisher
Data Source
Authors
Chousterman,M., Heysselaer,D., Dridi,S. M., Bayet,F., Misset,B., Lamard,L., Peremans,A., Nyssen-Behets,C., Nammour,S.
Original/Translated Title
URL
Date of Electronic
20090815
PMCID
Editors
|
|||
| Application of chemometric assisted dispersive liquid-liquid microextraction to the determination of personal care products in natural waters | 2009 | Department of Chemistry, University of Ioannina, Ioannina 45110, Greece. | Read more... |
|
Source Type
Print(0)
Ref Type
Journal Article
Periodical, Full
Analytica Chimica Acta
Periodical, Abbrev.
Anal.Chim.Acta
Pub Date Free Form
7-Sep
Volume
649
Issue
2
Start Page
135
Other Pages
140
Notes
LR: 20121115; JID: 0370534; 0 (Phthalic Acids); 0 (Polycyclic Compounds); 0 (Solvents); 0 (Water Pollutants, Chemical); 6O7F7IX66E (phthalic acid); 2009/05/28 [received]; 2009/07/07 [revised]; 2009/07/09 [accepted]; 2009/07/14 [aheadofprint]; ppublish
Place of Publication
Netherlands
ISSN/ISBN
1873-4324; 0003-2670
Accession Number
PMID: 19699389
Language
eng
SubFile
Journal Article; IM
DOI
10.1016/j.aca.2009.07.028 [doi]
Output Language
Unknown(0)
PMID
19699389
Abstract
A rapid and simple method for the determination of two phthalates and five polycyclic musks in water samples using dispersive liquid-liquid microextraction (DLLME) mated to chemometrics and coupled to GC-MS was developed. Volume of extraction (CCl4) and disperser solvent (MeOH), pH, ionic strength, extraction time, centrifugation time as well as centrifugation speed were optimized in a 2(7-4) Plackett-Burman design. The obtained significant factors were optimized by using a central composite design (CCD) and the quadratic model between the dependent and the independent variables was built. The optimum experimental conditions of the proposed method were: 250 microL carbon tetrachloride, 0.62 mL methanol, 7.5 min centrifugation time, natural pH containing 0% (w/v) NaCl, while keeping centrifugation speed fixed at 4000 rpm. The calculated calibration curves gave high-level linearity for all target analytes with correlation coefficients ranging between 0.9970 and 0.9992. The repeatability and reproducibility of the proposed method, expressed as relative standard deviation, varied between 2.6% to 9.7% and 5.7% to 12.2%, respectively. The obtained LOD values were in the range of 8-63 ng L(-1).
Descriptors
Fresh Water/analysis, Gas Chromatography-Mass Spectrometry/methods, Humans, Hydrogen-Ion Concentration, Osmolar Concentration, Phthalic Acids/analysis/isolation & purification, Polycyclic Compounds/analysis/isolation & purification, Solvents/chemistry, Water Pollutants, Chemical/analysis/isolation & purification
Links
Book Title
Database
Publisher
Data Source
Authors
Panagiotou,A. N., Sakkas,V. A., Albanis,T. A.
Original/Translated Title
URL
Date of Electronic
20090714
PMCID
Editors
|
|||
| Determination of organochlorine pesticides in water samples by dispersive liquid-liquid microextraction coupled to gas chromatography-mass spectrometry | 2009 | Labaqua S.A., C/Dracma 16-18, Pol. Ind. Las Atalayas, 03114 Alicante, Spain. | Read more... |
|
Source Type
Print(0)
Ref Type
Journal Article
Periodical, Full
Analytica Chimica Acta
Periodical, Abbrev.
Anal.Chim.Acta
Pub Date Free Form
7-Sep
Volume
649
Issue
2
Start Page
218
Other Pages
221
Notes
LR: 20131121; JID: 0370534; 0 (Hydrocarbons, Chlorinated); 0 (Pesticides); 0 (Water Pollutants, Chemical); 059QF0KO0R (Water); 2009/05/18 [received]; 2009/07/14 [revised]; 2009/07/15 [accepted]; 2009/07/21 [aheadofprint]; ppublish
Place of Publication
Netherlands
ISSN/ISBN
1873-4324; 0003-2670
Accession Number
PMID: 19699397
Language
eng
SubFile
Journal Article; Research Support, Non-U.S. Gov't; IM
DOI
10.1016/j.aca.2009.07.041 [doi]
Output Language
Unknown(0)
PMID
19699397
Abstract
A rapid and simple dispersive liquid-liquid microextraction (DLLME) has been developed to preconcentrate eighteen organochlorine pesticides (OCPs) from water samples prior to analysis by gas chromatography-mass spectrometry (GC-MS). The studied variables were extraction solvent type and volume, disperser solvent type and volume, aqueous sample volume and temperature. The optimum experimental conditions of the proposed DLLME method were: a mixture of 10 microL tetrachloroethylene (extraction solvent) and 1 mL acetone (disperser solvent) exposed for 30 s to 10 mL of the aqueous sample at room temperature (20 degrees C). Centrifugation of cloudy solution was carried out at 2300 rpm for 3 min to allow phases separation. Finally, 2 microL of extractant was recovered and injected into the GC-MS instrument. Under the optimum conditions, the enrichment factors ranged between 46 and 316. The calculated calibration curves gave a high-level linearity for all target analytes with correlation coefficients ranging between 0.9967 and 0.9999. The repeatability of the proposed method, expressed as relative standard deviation, varied between 5% and 15% (n=8), and the detection limits were in the range of 1-25 ng L(-1). The LOD values obtained are able to detect these OCPs in aqueous matrices as required by EPA methods 525.2 and 625. Analysis of spiked real water samples revealed that the matrix had no effect on extraction for river, surface and tap waters; however, urban wastewater sample shown a little effect for five out of eighteen analytes.
Descriptors
Fresh Water/analysis/chemistry, Gas Chromatography-Mass Spectrometry/methods, Hydrocarbons, Chlorinated/analysis/chemistry/isolation & purification, Pesticides/analysis/isolation & purification, Water/chemistry, Water Pollutants, Chemical/analysis/chemistry/isolation & purification
Links
Book Title
Database
Publisher
Data Source
Authors
Cortada,C., Vidal,L., Pastor,R., Santiago,N., Canals,A.
Original/Translated Title
URL
Date of Electronic
20090721
PMCID
Editors
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