Effects of Low-Level Laser Therapy on Collagen Expression and Neutrophil Infiltrate in 5-Fluorouracil-Induced Oral Mucositis in Hamsters

Background and Objectives: Several studies have suggested that low-level laser therapy (LLLT) can ameliorate oral mucositis, however, the mechanisms involved are not well understood. The aim of this study was to investigate the mechanisms of action of LLLT on chemotherapy-induced oral mucositis, as related to effects on collagen expression and inflammation Materials and Methods: A hamster cheek pouch model of oral mucositis was used with all animals receiving intraperitoneal 5-fluorouracil, followed by surface irritation. Animals were randomly allocated into three groups, and treated with an InGaAIP diode laser at a wavelength of 660 nm and output power of 35 or 100 mW laser, or no laser Clinical severity of mucositis was assessed at four time-points by a blinded examiner Buccal pouch tissue was harvested from a subgroup of animals in each group at four time-points. Collagen was qualitatively and quantitatively evaluated after picrosinus staining. The density of the neutrophil infiltrate was also scored Results: Peak clinical severity of mucositis was reduced in the 35 mW laser group as compared to the 100 mW and control groups The reduced peak clinical severity of mucositis in the 35 mW laser group was accompanied by a decrease in the number of neutrophils and an increase in the proportion of mature collagen as compared to the other two groups. The total quantity of collagen was significantly higher in the control (no laser) group at the day 11 time-point, as compared to the 35 mW laser group, consistent with a more prolonged inflammatory response in the control group. Conclusion: This study supports two mechanisms of action for LLLT in reducing mucositis severity. The increase in collagen organization in response to the 35 mW laser indicates that LLLT promotes wound healing In addition, LLLT also appears to have an anti-inflammatory effect, as evidenced by the reduction in neutrophil infiltrate Lasers Surg Med 42 546-552, 2010. (C) 2010 Wiley-Liss, Inc.

Comparison between blue and green stimulated luminescence of Al(2)O(3):C

This paper presents a systematic comparison of OSL signals from Al(2)O(3):C when stimulated with blue and green light. Al(2)O(3):C detectors were irradiated with various doses and submitted to various bleaching regimes using yellow, green and blue light. Most of the investigations were carried out using Luxel (TM)-type detectors used in the commercial Luxet (TM) and InLight (TM) dosimetry systems (Landauer Inc.). Al(2)O(3):C single crystals and Al(2)O(3):C powder were also used to complement the investigations. The results show that, although blue stimulation provides faster readout times (OSL curves that decayed faster) and higher initial OSL intensity than green stimulation, blue stimulation introduced complicating factors. These include incomplete bleaching of the dosimetric trap when the Al(2)O(3):C detectors are bleached with yellow or green light and the OSL is recorded with blue light stimulation, and an increased residual level due to stimulation of charge carriers from deep traps. The results warrant caution when using blue stimulation to measure the OSL signal from Al(2)O(3):C detectors, particularly if the doses involved are low and the detectors have been previously exposed to high doses. (C) 2010 Elsevier Ltd. All rights reserved.

Cyclooxygenase-2 and vascular endothelial growth factor expression in 5-fluorouracil-induced oral mucositis in hamsters: evaluation of two low-intensity laser protocols

The aim of this study was to investigate the mechanisms whereby low-intensity laser therapy may affect the severity of oral mucositis. A hamster cheek pouch model of oral mucositis was used with all animals receiving intraperitoneal 5-fluorouracil followed by surface irritation. Animals were randomly allocated into three groups and treated with a 35 mW laser, 100 mW laser, or no laser. Clinical severity of mucositis was assessed at four time-points by a blinded examiner. Buccal pouch tissue was harvested from a subgroup of animals in each group at four time-points. This tissue was used for immunohistochemistry for cyclooxygenase-2 (COX-2), vascular endothelial growth factor (VEGF), and factor VIII (marker of microvessel density) and the resulting staining was quantified. Peak severity of mucositis was reduced in the 35 mW laser group as compared to the 100 mW laser and control groups. This reduced peak clinical severity of mucositis in the 35 mW laser group was accompanied by a significantly lower level of COX-2 staining. The 100 mW laser did not have an effect on the severity of clinical mucositis, but was associated with a decrease in VEGF levels at the later time-points, as compared to the other groups. There was no clear relationship of VEGF levels or microvessel density to clinical mucositis severity. The tissue response to laser therapy appears to vary by dose. Low-intensity laser therapy appears to reduce the severity of mucositis, at least in part, by reducing COX-2 levels and associated inhibition of the inflammatory response.

Assessment the Health Hazard from (222)Rn in Old Metalliferous Mines in San Luis, Argentina

Radon levels in two old mines in San Luis, Argentina, are reported and analyzed. The radiation dose and environmental health risk of (222)Rn concentrations to both guides and visitors were estimated. CR-39 nuclear track detectors were used for this purpose. The values for the (222)Rn concentration at each monitoring site ranged from 0.43 +/- 0.04 to 1.48 +/- 0.12 kBq m(-3) in the Los Cndores wolfram mine and from 1.8 +/- 0.1 to 6.0 +/- 0.5 kBq center dot m(-3) in the La Carolina gold mine, indicating that, in this mine, the radon levels exceed up to four times the action level of 1.5 kBq m(-3) recommended by the International Commission on Radiological Protection. The patterns of the radon transport process revealed that the La Carolina gold mine can be interpreted as a gas confined into a single tube with constant cross-section and air velocity. Patterns of radon activity, taking into account the chimney-effect winds, were used to detect tributary currents of air from shafts or larger fissures along the main adit of the Los Cndores mine, showing that radon can be used as an important tracer of tributary air currents stream out from fissures and smaller voids in the rock of the mine.

Diagnostic reference levels for the most frequent radiological examinations carried out in Brazil

Objectives. A large-scale survey of doses to patients undergoing the most frequent radiological examinations was carried out in health services in Sao Paulo (347 radiological examinations per 1 000 inhabitants), the most populous Brazilian state. Methods. A postal dosimetric kit with thermoluminescence dosimeters was used to evaluate the entrance surface dose (ESD) to patients. A stratified sampling technique applied to the national health database furnished important data on the distribution of equipment and the annual number of examinations. Chest, head (skull and sinus), and spine (cervical, thoracic, and lumbar) examinations were included in the trial. A total of 83 rooms and 868 patients were included, and 1 415 values of ESD were measured. Results. The data show large coefficients of variation in tube charge, giving rise to large variations in ESD values. Also, a series of high ESD values associated with unnecessary localizing fluoroscopy were detected. Diagnostic reference levels were determined, based on the 75th percentile (third quartile) of the ESD distributions. For adult patients, the diagnostic reference levels achieved are very similar to those obtained in international surveys. However, the situation is different for pediatric patients: the ESD values found in this survey are twice as large as the international recommendations for chest radiographs of children. Conclusions. Despite the reduced number of ESD values and rooms for the pediatric patient group, it is recommended that practices in chest examinations be revised and that specific national reference doses and image quality be established after a broader survey is carried out.

Analysis and risk estimates to workers of Brazilian granitic industries and sandblasters exposed to respirable crystalline silica and natural radionuclides

Occupational exposure to respirable crystalline silica and to radiation emitted by natural radionuclides present both in rocks and sands was studied in the Brazilian extractive process and granite product manufacture. Respirable airborne dust samples were collected in working environments, where workers perform different tasks with distinct commercial granites types, and also in places where sandblasters work with sands from different origins. The free crystalline silica contents were determined using X-ray diffraction of the respirable particulate fraction of each sample. Dust samples from granite cutting and sandblasting ambient had the natural radionuclides concentrations measured by gamma spectrometry. Dust concentrations in the workplaces were quite variable, reaching values up to 10 times higher than the respirable particle mass threshold limit value (TLV) set by the American Conference for Governmental Industrial Hygienists of 3 mg m(-3). Also the free crystalline silica concentrations were high. reaching values up to 48 times the TLV of 0.025 mg m(-3). Additionally, our results suggest that the risk of radiation-induced cancer in the granite or marble industries is negligible. However, the combined exposure to dust, gamma radiation, and radon daughter products could result in the enhancement of lung cancer risks associated to sandblasting activities. (C) 2010 Elsevier Ltd. All rights reserved.

Occupational exposure to radon and natural gamma radiation in the La Carolina, a former gold mine in San Luis Province, Argentina

Radon and gamma radiation level measurements were carried out inside the La Carolina mine, one of the oldest gold mining camps of southern South America, which is open for touristic visits nowadays. CR-39 track-etch detectors and thermoluminescent dosimeters of natural CaF(2) and LiF TLD-100 were exposed at 14 points along the mine tunnels in order to estimate the mean (222)Rn concentration and the ambient dose equivalent during the summer season (November 2008 to February 2009). The values for the (222)Rn concentration at each monitoring site ranged from 1.8 +/- 0.1 kBq m(-3) to 6.0 +/- 0.5 kBq m(-3), with a mean value of 4.8 kBq m(-3), indicating that these measurements exceed in about three times the upper action level recommended by ICRP for workplaces. The correlations between radon and gamma radiation levels inside the mine were also investigated. Effective doses due to (222)Rn and gamma rays inside the mine were determined, resulting in negligible values to tourists. Considering the effective dose to the mine tourist guides, values exceeding 20 mSv of internal contribution to the effective doses can be reached, depending on the number of working hours inside the mine. (C) 2009 Elsevier Ltd. All rights reserved.

Development of a heavy metal sorption system through the P=S functionalization of coconut (Cocos nucifera) fibers

Lignocellulosic residues are interesting materials for the production of heavy metal adsorbents for aquatic systems. Whole fibers taken from coconut (Cocos nucifera) husks were functionalized with the thiophosphoryl (P=S) group by means of the direct reaction with CI(3)P=S, (CH(3)O)(2)CIP=S or (CH(3)CH(2)O)(2)CIP=S in order to obtain an adsorptive system for `soft` metal ions, particularly Cd(2+). These functionalized fibers (FFs) were characterized by means of elemental analysis, infrared spectroscopy, thermal analysis and acid-base titration. Adsorption isotherms for Cd(2+) fitted the Langmuir model, with binding capacities of 0.2-5 mmol g(-1) of FF at 25 degrees C. (C) 2009 Elsevier Ltd. All rights reserved.

Evaluation of some metals in Brazilian coffees cultivated during the process of conversion from conventional to organic agriculture

The aim of this study was to evaluate the presence of nutrients and toxic elements in coffees cultivated during the process of conversion, on organic agriculture, in southwest Bahia, Brazil. Levels of the nutrients and toxic elements were determined in samples of soils and coffee tissues from two transitional organic farms by atomic absorption spectrometry (FAAS). The metals in soil samples were extracted by Mehlich1 and USEPA-3050 procedures. Coffee samples from both farms presented relatively high levels of Cd, Zn and Cu (0.75,45.4 and 14.9 mu g g(-1). respectively), but were still below the limits specified by the Brazilian Food Legislation. The application of statistical methods showed that this finding can be attributed to the addition of high amounts of organic matter during the flowering tree period which can act on the bioavailability of metal ions in soils. (C) 2009 Elsevier Ltd. All rights reserved.

Feasibility of using in situ fusion for the determination of Co, Cr and Mn in Portland cement by direct solid sampling graphite furnace atomic absorption spectrometry

In situ fusion on the boat-type graphite platform has been used as a sample pretreatment for the direct determination of Co, Cr and Mn in Portland cement by solid sampling graphite furnace atomic absorption spectrometry (SS-GF AAS). The 3-field Zeeman technique was adopted for background correction to decrease the sensitivity during measurements. This strategy allowed working with up to 200 mu g of sample. The in situ fusion was accomplished using 10 mu L of a flux mixture 4.0% m/v Na(2)CO(3) + 4.0% m/v ZnO + 0.1% m/v Triton (R) X-100 added over the cement sample and heated at 800 degrees C for 20 s. The resulting mould was completely dissolved with 10 mu L of 0.1% m/v HNO(3). Limits of detection were 0.11 mu g g(-1) for Co, 1.1 mu g g(-1) for Cr and 1.9 mu g g(-1) for Mn. The accuracy of the proposed method has been evaluated by the analysis of certified reference materials. The values found presented no statistically significant differences compared to the certified values (Student`s t-test, p<0.05). In general, the relative standard deviation was lower than 12% (n = 5). (C) 2009 Elsevier B.V. All rights reserved.

Metal transport parameters of a gneiss saprolitic silty soil for liner design

Diffusion coefficients and retardation factors of two metal cations (Cd2+ and Pb2+) were measured for a compacted Brazilian saprolitic soil derived from gneiss, aiming to assess its geoenvironmental performance as a liner for waste disposal sites. This soil occurs extensively all over the country in very thick layers, but has not been used in liners because of its hydraulic conductivity, higher than 10(-9) m/s when compacted at optimum water content of standard Proctor energy, but which can be reduced by means of appropriate compaction techniques or additives. Batch, column, and diffusion tests were carried out with monospecies synthetic solutions at pH 1, 3, and 5.5. Measured diffusion coefficients varied between 0.5 and 4 X 10(-10) m(2)/s. Retardation factors show that cadmium, a very mobile cation, is not adsorbed at pH I but is significantly retained at pH 3 and pH 5.5, whereas lead is retained at all tested pH values though slightly at pH 1. Estimated retardation factors from batch tests were 1.3-2.3 times those resulting from column tests and at its highest when obtained by diffusion tests; whereas batch tests allow a more complete exposure of the soil grains to the solution, time-dependent nonspecific adsorption may take longer to occur. The importance of contact time was observed and should be considered in further investigations. Its significant retention of metals suggests a promising utilization of this soil as a bottom liner for wastes landfills.

Varför utvecklar människan ett anorektiskt beteende?

Mitt syfte med denna undersökning är att i ett djupare perspektiv redogöra för orsaksgrunder till att någon börjar svälta sig själv och utvecklar ett anorektiskt beteende. Ambitionen har varit att använda mig av en metod som går ut på att jämföra min egen förståelse, som kopplas till en sociologisk teoretisk utgångspunkt, med verkligheten genom att göra observationer och djupintervjuer på ett begränsat antal personer. Ingen avsikt har funnits att generera någon fullständig vetenskaplig sanning, utan endast se på fenomenet i ett djupare perspektiv som kan användas till underlag för ytterliggare forskning vid ett senare tillfälle.Enligt min förförståelse är grunden till att någon ska utveckla anorexi en process som startar redan då individen föds. De människor och den miljö som människan först av allt kommer i kontakt med är hennes totala verklighet och det enda som hon är medveten om. Vad som händer under denna episod i livet i kombination med senare sociala möten i olika situationer är de faktorer som möjliggör ett utlösande eller inte om en person börjar svälta sig själv och utveckla ett anorektiskt beteende. Denna förförståelse har kopplats till socialpsykologiska teoretiska utgångspunkter, i första hand G H Meads teorier i den symboliska interaktionismen om ”jagmedvetandets” ursprung, och därefter jämförts med studier av verkligheten.De resultat som jag har kommit fram till stödjer uppfattning om att de sociala interaktioner som människan gör tidigt i livet påverkar möjligheterna till ett senare utvecklande av anorexi eller inte. Jag har sett under detta arbetes gång att den faktor som är utlösande beror till största del av vilka sociala möten som människan gör senare i livet. Även om individen har förutsättningar till anorexi, så kan den utlösande faktorn utebli och konsekvensen blir att ett anorektiskt utvecklande uteblir. Min undersökning visar att om den utlösande faktorn infinner sig så sker detta oftast vid en tidpunkt i livet då människan är i en känsligare period, till exempel i tonåren då steget mot självständighet och frigörelse från föräldrarna ska tas. Jag har utifrån detta perspektiv dragit slutsatsen att anorexi kan ses som en utvecklingskris.

Ungdomars kunskap om och attityder till HIV/AIDS samt deras sexuella beteende : en systematisk litteraturstudie

Syftet med denna systematiska litteraturstudie var att ur ett globalt perspektiv undersöka ungdomars kunskaper om HIV/AIDS och vilka faktorer som påverkar kunskapsnivån. Syftet var vidare att ur ett globalt perspektiv undersöka ungdomars attityder till HIV/AIDS samt deras sexuella beteende. Sökning av artiklar har skett via databaserna Blackwell Synergy, ELIN@dalarna samt EBSCO Host. Övrig litteratur söktes manuellt på Internet och bibliotek. Inklusionkriterier var att artiklarna skulle vara publicerade mellan år 2000-2006, ha ett vetenskapligt värde, vara skrivna på det svenska eller engelska språket samt vara primärstudier. Vidare skulle deltagarna i artiklarna utgöras av ungdomar mellan 13-25 år. För att bedöma artiklarnas kvalitet användes två granskningsmallar en för kvalitativa artiklar och en för kvantitativa artiklar. Studiens resultat visade att kunskapsnivån bland ungdomar såg olika ut beroende av kön, ålder, sexuell erfarenhet, antal partners, kultur, ekonomiska förutsättningar, föräldrarnas utbildningsnivå samt boende i tätort eller på landsbygd. Ungdomarna uttryckte en rädsla för att smittas av HIV men ansåg sig inte vara i riskzonen för att smittas. Informationskällor om HIV/AIDS utgjordes främst av media och undervisning i skolan. Åldern för ungdomarnas sexuella debut varierade. Resultatet visade även att ett flertal sexpartners var vanligt förekommande och att kondom sällan användes som skydd vid samlag.

Palliativ vård i hemmet : Upplevelser och behov av stöd hos patienter med cancer

Syftet med denna systematiska litteraturstudie var att beskriva hur patienter med cancer upplevde att vårdas palliativt i hemmet samt vilket behov av stöd de hade. Litteratursökningen genomfördes på databaserna Blackwell Synergy, PubMed och Elin. Artiklarna skulle vara publicerade mellan åren 1999 och 2007. Granskningen av artiklarna genomfördes med hjälp av en modifierad mall av Willman, Stoltz och Forsberg, Wengström. Urvalet resulterade i elva kvalitativa och sex kvantitativa artiklar. Resultatet visade att patienterna med cancer ville bo kvar i det egna hemmet och att de inte ville bli vårdade eller dö på sjukhus. De som vårdades i hemmet hade bättre välbefinnande både psykiskt och fysiskt. Patienterna ansåg att deras närstående var en viktig del av vården men det framkom även att de upplevde sig som en börda för de närstående. Kontakten med det palliativa teamet var betydelsefull och teamet hade positiv inverkan på dem. Det framkom dock att de önskade att stödet från det palliativa teamet hade kommit tidigare i sjukdomen. Det ansågs också som viktigt att ha tillgång till vårdpersonal dygnet runt samt att få råd och information kring medicinska och alternativa behandlingar. Patienterna hade behov av emotionellt stöd och de önskade att teamet delade deras känslor.

Stärkande omvårdnad : En litteraturstudie om förlossningsrädsla under graviditet och förlossning

Förlossningsrädsla utgör en speciell utmaning för mödrahälsovården och förlossningsvården.En konsekvens av rädslan är att kvinnor allt oftare kräver kejsarsnitt utan medicinsk indikation. Syftet med denna studie var att belysa faktorer som ligger till grund för förlossningsrädsla samt att ta reda på hur omvårdnadspersonal kan ge stärkande omvårdnad till denna sårbara grupp. Metoden var en systematisk litteraturstudie som omfattade fjorton vetenskapliga artiklar. Materialet till litteraturstudien identifierades via datoriserad och manuell sökning i databaser och tidsskrifter på Högskolan Dalarnas bibliotek samt sjukhus biblioteket på Falu Lasarett. Sökningen gjordes i databaserna ELIN@dalarna, Pub Med, Swe Med, Libris och Google sholar. Sökord som användes var: Fear of childbirth. Resultatet visade att rädslans innehåll och natur hänger samman med kvinnans personliga förutsättningar samt den sociala situation hon lever i. En slutsats blev att många kvinnor behöver hjälp för sin oro inför förlossningen och många har i högre grad än andra väntande kvinnor haft besvär med psykisk ohälsa. En viktig förutsättning för ett optimalt och professionellt bemötande av den förlossningsrädda kvinnan är ett gott samarbete mellan hela vårdkedjan, så alla har samma synsätt. Genom att alla säger samma saker skapas en trygghet.