| 1. |
- Ademovski, Seida Erovic, et al.
(författare)
-
The effect of periodontal therapy on intra-oral halitosis : a case series
- 2016
-
Ingår i: Journal of Clinical Periodontology. - : John Wiley & Sons. - 0303-6979 .- 1600-051X. ; 43:5, s. 445-452
-
Tidskriftsartikel (refereegranskat)abstract
- AIM: The aim of this study was to evaluate the effects of non-surgical periodontal therapy on intra-oral halitosis 3 months after therapy.MATERIAL AND METHODS: Sixty-eight adults with intra-oral halitosis were included in a case series. Intra-oral halitosis was evaluated at baseline, and at 3 months after treatment using the organoleptic scores (OLS), Halimeter® , and a gas chromatograph.RESULTS: Significant reductions for OLS (p < 0.01), total sum of volatile sulphur compounds (T-VSC) (p < 0.01) and methyl mercaptan (MM) (p < 0.05) values were found after treatment. Hydrogen sulphide (H2 S) levels were not significantly reduced. The numbers of probing pockets 4 mm, 5 mm and 6 mm were significantly reduced as a result of therapy (p < 0.001). Bleeding on probing (BOP) and plaque indices were also significantly reduced (p < 0.001). For the 34 individuals with successful periodontal treatment (BOP<20% and a ≥50% reduction of total pocket depth) reductions in OLS (p < 0.01) and T-VSC scores (p < 0.01) were found. Eleven individuals were considered effectively treated for intra-oral halitosis presenting with a T-VSC value <160 ppb, a H2 S value <112 ppb and a MM value <26 ppb.CONCLUSION: Non-surgical periodontal therapy resulted in reduction of OLS, MM and T-VSC values 3 months after therapy. Few individuals were considered as effectively treated for intra-oral halitosis.
|
|
| 2. |
- Cappel, Ute B, et al.
(författare)
-
Electronic structure dynamics in a low bandgap polymer studied by time-resolved photoelectron spectroscopy.
- 2016
-
Ingår i: Physical Chemistry, Chemical Physics - PCCP. - : Royal Society of Chemistry. - 1463-9076 .- 1463-9084. ; 18:31, s. 21921-9
-
Tidskriftsartikel (refereegranskat)abstract
- Means to measure the temporal evolution following a photo-excitation in conjugated polymers are a key for the understanding and optimization of their function in applications such as organic solar cells. In this paper we study the electronic structure dynamics by direct pump-probe measurements of the excited electrons in such materials. Specifically, we carried out a time-resolved photoelectron spectroscopy (TRPES) study of the polymer PCPDTBT by combining an extreme ultraviolet (XUV) high harmonic generation source with a time-of-flight spectrometer. After excitation to either the 1st excited state or to a higher excited state, we follow how the electronic structure develops and relaxes on the electron binding energy scale. Specifically, we follow a less than 50 fs relaxation of the higher exited state and a 10 times slower relaxation of the 1st excited state. We corroborate the results using DFT calculations. Our study demonstrates the power of TRPES for studying photo-excited electron energetics and dynamics of solar cell materials.
|
|
| 3. |
- Erovic Ademovski, Seida, et al.
(författare)
-
The long-term effect of a zinc acetate and chlorhexidine diacetate containing mouth rinse on intra-oral halitosis-A randomized clinical trial.
- 2017
-
Ingår i: Journal of Clinical Periodontology. - : John Wiley & Sons. - 0303-6979 .- 1600-051X. ; 44:10, s. 1010-1019
-
Tidskriftsartikel (refereegranskat)abstract
- AIM: To evaluate the long-term effects of a zinc acetate and chlorhexidine diacetate mouth rinse (Zn/CHX) on intra-oral halitosis.MATERIALS AND METHODS: Forty-six adults with intra-oral halitosis were randomized into a 6-month, double-blind, placebo-controlled clinical study. The presence of intra-oral halitosis was evaluated at baseline, 3 and 6 months after treatment by assessment of organoleptic score (OLS) and by total volatile sulphur compounds (T-VSC), hydrogen sulphide (H2 S) and methyl mercaptan (MM) concentrations in exhaled air.RESULTS: A Zn/CHX mouth rinse provided significantly better control of intra-oral halitosis than a placebo mouth rinse. At 3 and 6 months, individuals rinsing with the Zn/CHX rinse presented with reductions of the OLS, T-VSC (p < .01, respectively), H2 S (p < .001), and MM (p < .01) in subjects' exhaled air. At 6 months, 68.2% of individuals using the Zn/CHX rinse experienced a 1 or 2 category improvement in OLS compared with 19.1% of placebo-treated subjects. 91% of subjects in the Zn/CHX group were categorized as being effectively treated for intra-oral halitosis (i.e. H2 S < 112 ppb), compared to 43% in the placebo group.CONCLUSION: Zn/CHX mouth rinse provides effective long-term efficacy against intra-oral halitosis, assessed both objectively and subjectively. With regular rinsing, the effect was sustained for 6 months.
|
|
| 4. |
- Kaya, Ibrahim, et al.
(författare)
-
On-Tissue Chemical Derivatization of Catecholamines Using 4-(N-Methyl)pyridinium Boronic Acid for ToF-SIMS and LDI-ToF Mass Spectrometry Imaging
- 2018
-
Ingår i: Analytical Chemistry. - : American Chemical Society (ACS). - 0003-2700 .- 1520-6882. ; 90:22, s. 13580-13590
-
Tidskriftsartikel (refereegranskat)abstract
- The analysis of small polar compounds with ToF-SIMS and MALDI-ToF-MS have been generally hindered by low detection sensitivity, poor ionization efficiency, ion suppression, analyte in-source fragmentation, and background spectral interferences from either a MALDI matrix and/or endogenous tissue components. Chemical derivatization has been a well-established strategy for improved mass spectrometric detection of many small molecular weight endogenous compounds in tissues. Here, we present a devised strategy to selectively derivatize and sensitively detect catecholamines with both secondary ion ejection and laser desorption ionization strategies, which are used in many imaging mass spectrometry (IMS) experiments. Chemical derivatization of catecholamines was performed by a reaction with a synthesized permanent pyridinium-cation-containing boronic acid molecule, 4-(N-methyl)pyridinium boronic acid, through boronate ester formation (boronic acid-diol reaction). The derivatization facilitates their sensitive detection with ToF-SIMS and LDI-ToF mass spectrometric techniques. 4-(N-Methyl)pyridinium boronic acid worked as a reactive matrix for catecholamines with LDI and improved the sensitivity of detection for both SIMS and LDI, while the isotopic abundances of the boron atom reflect a unique isotopic pattern for derivatized catecholamines in MS analysis. Finally, the devised strategy was applied, as a proof of concept, for on-tissue chemical derivatization and GCIB-ToF-SIMS (down to 3 μm per pixel spatial resolution) and LDI-ToF mass spectrometry imaging of dopamine, epinephrine, and norepinephrine in porcine adrenal gland tissue sections. MS/MS using collision-induced dissociation (CID)-ToF-ToF-SIMS was subsequently employed on the same tissue sections after SIMS and LDI mass spectrometry imaging experiments, which provided tandem MS information for the validation of the derivatized catecholamines in situ. This methodology can be a powerful approach for the selective and sensitive ionization/detection and spatial localization of diol-containing molecules such as aminols, vic-diols, saccharides, and glycans along with catecholamines in tissue sections with both SIMS and LDI/MALDI-MS techniques. © 2018 American Chemical Society.
|
|
| 5. |
- Kitutu, Freddy, 1982-, et al.
(författare)
-
Can malaria rapid diagnostic tests by drug sellers under feld conditions classify children 5 years old or less with or without Plasmodium falciparum malaria? : Comparison with nested PCR analysis
- 2018
-
Ingår i: Malaria Journal. - : Springer Science and Business Media LLC. - 1475-2875. ; 17
-
Tidskriftsartikel (refereegranskat)abstract
- Background Malaria rapid diagnostic tests (RDTs) available as dipsticks or strips, are simple to perform, easily interpretable and do not require electricity nor infrastructural investment. Correct interpretation of and compliance with the malaria RDT results is a challenge to drug sellers. Thus, drug seller interpretation of malaria RDT strips was compared with laboratory scientist re-reading, and PCR analysis of Plasmodium DNA extracted from malaria RDT nitrocellulose strips and Fast Transient Analysis (FTA) cards. Malaria RDT cassettes are also assessed as potential source of Plasmodium DNA.MethodsA total of 212 children aged between 2 and 60 months, 199 of whom had complete records at two study drug shops in south west Uganda participated in the study. Duplicate 5μL samples of capillary blood were picked from the 212 children, dispensed onto the sample well of the CareStartTM Pf-HRP2 RDT cassette and a fast transient analysis (FTA), WhatmanTM 3MM filter paper in parallel. The malaria RDT strip was interpreted by the drug seller within 15 to 20 minutes, visually re-read centrally by laboratory scientist and from it; Plasmodium DNA was recovered and detected by PCR, and compared with FTA recovered P. falciparum DNA PCR detection.ResultsMalaria positive samples were 62/199 (31.2% 95% CI 24.9 - 38.3) by drug seller interpretation of malaria RDT strip, 59/212 (27.8% 95% CI 22.2 – 34.3) by laboratory scientist, 55/212 (25.9% 95% CI 20.0 – 32.6) by RDT nitrocellulose strip PCR and 64/212 (30.2% 95% CI 24.4 – 37.7). The overall agreement between the drug seller interpretation and laboratory scientist re-reading of the malaria RDT strip was 93% with kappa value of 0.8 (95 % CI 0.7, 0.9). The drug seller compliance with the reported malaria RDT results and kappa value were 92.5% and 0.8 (95% CI 0.7, 0.9), respectively. The performance of the three diagnostic strategies compared with FTA PCR as the gold standard had sensitivity between 76.6% and 86.9%, specificity above 90%, positive predictive value ranging from 79% to 89.8% and negative predictive value above 90%.Conclusion:Drug sellers can use of malaria RDTs in field conditions and achieve acceptable accuracy for malaria diagnosis, and they comply with the malaria RDT results. Plasmodium DNA can be recovered from malaria RDT nitrocellulose strips even in the context of drug shops. Future malaria surveillance and diagnostic quality control studies with malaria RDT cassette as a source of Plasmodium DNA are recommended.
|
|
| 6. |
- Mårtensson, Stefan, et al.
(författare)
-
Are avalanche courses the new high-risk sport? : Use of Sensation Seeking Scale in Avalanche Education Highlights the Need for Reassessment of Participants’ True Nature and Suggests that the Test Itself Can Serve as a Learning Tool
- 2018
-
Konferensbidrag (refereegranskat)abstract
- In a perfect world, the risk of dying in an avalanche should decrease with knowledge. On the contrary, studies have shown that this risk might increase after an avalanche course. Could it be that par- ticipants from the beginning have an appetite for risks? If so, how high is this preference for risk-taking? Can such knowledge of personal risk preference be used to help the participants understand their own risk-taking? A majority of avalanche accidents are caused by the victim itself, but few studies have inves- tigated the personal disposition of risk-taking. This risk preference can be estimated by measuring sensa- tion seeking. Sensation Seeking Scale (SSS) is a psychometric tool and has been used in studies of high- risk sports such as skiing, parachuting, diving or climbing. During two winters the SSS test was used on Swedish avalanche courses, a total of 333 participants completed the test. The instructors also used the test results in a risk-taking module where participants reflected on their personal risk preferences. Results show that sensation seeking is relatively high among participants. The total average is 21.9 (SD 5.1), which is in line with high-risk sports. Another result is that both participants and instructors experience the test as an important and appreciated module. The conclusions are partly that avalanche courses should be regarded as a high-risk sport because the participants have high-risk preferences, partly that the SSS test itself serves as a learning tool for self-reflection and increased understanding of the participants’ own risk-taking.
|
|
| 7. |
- Senkovskiy, Boris V., et al.
(författare)
-
Semiconductor-to-Metal Transition and Quasiparticle Renormalization in Doped Graphene Nanoribbons
- 2017
-
Ingår i: Advanced Electronic Materials. - : Wiley. - 2199-160X. ; 3:4
-
Tidskriftsartikel (refereegranskat)abstract
- A semiconductor-to-metal transition in N = 7 armchair graphene nanoribbons causes drastic changes in its electron and phonon system. By using angle-resolved photoemission spectroscopy of lithium-doped graphene nanoribbons, a quasiparticle band gap renormalization from 2.4 to 2.1 eV is observed. Reaching high doping levels (0.05 electrons per atom), it is found that the effective mass of the conduction band carriers increases to a value equal to the free electron mass. This giant increase in the effective mass by doping is a means to enhance the density of states at the Fermi level which can have palpable impact on the transport and optical properties. Electron doping also reduces the Raman intensity by one order of magnitude, and results in relatively small (4 cm−1) hardening of the G phonon and softening of the D phonon. This suggests the importance of both lattice expansion and dynamic effects. The present work highlights that doping of a semiconducting 1D system is strikingly different from its 2D or 3D counterparts and introduces doped graphene nanoribbons as a new tunable quantum material with high potential for basic research and applications.
|
|
| 8. |
- Wikberg, Per-Olov, et al.
(författare)
-
Changes in Attitudes To Risk and Knowledge About Avalanches Among Swedish Skiers After The Introduction of a National Avalanche Safety Program
- 2018
-
Konferensbidrag (refereegranskat)abstract
- In 2013, a web survey was conducted together with Freeride.se, aimed towards Swedish off-piste skiers in order to identify the target group's knowledge, experience and attitudes towards off-piste skiing and avalanches. 1047 skiers participated. The results of the survey gave new important knowledge about different target groups prior to the start of the Swedish avalanche forecast program and also more knowledge regarding the level of avalanche awareness among skiers in general. In 2016 Sweden launched the first national avalanche forecasting program and the same year, a revised avalanche education program was developed and presented. Both constitute important tools for prevention of future avalanche accidents among Swedish skiers. In April 2017, a repetition of the first survey was initiated, with nearly the same questionnaire, to see if there had been any change in behavior, attitudes to risk and knowledge about avalanche awareness among Swedish skiers since 2013. With 1028 participants, the results of the new survey showed some interesting changes that probably could be seen as early effects of the introduction of a new public avalanche forecasting service together with the revised avalanche education program.
|
|
