bluuebunny/crossref_metadata_2025 huggingface dataset:
Parameterization of oceanic whitecap fraction based on satellite observations
Authors: Albert M. F. M. A. , Anguelova M. D. , Manders A. M. M. , Schaap M. , de Leeuw G.
Published: August 2015

Abstract. In this study the utility of satellite-based whitecap fraction (W) values for the prediction of sea spray aerosol (SSA) emission rates is explored. More specifically, the study is aimed at improving the accuracy of the sea spray source function (SSSF) derived by using the whitecap method through the reduction of the uncertainties in the parameterization of W by better accounting for its natural variability. The starting point is a dataset containing W data, together with matching environmental and statistical data, for 2006. Whitecap fraction W was estimated from observations of the ocean surface brightness temperature TB by satellite-borne radiometers at two frequencies (10 and 37 GHz). A global scale assessment of the data set to evaluate the wind speed dependence of W revealed a quadratic correlation between W and U10, as well as a relatively larger spread in the 37 GHz data set. The latter could be attributed to secondary factors affecting W in addition to U10. To better visualize these secondary factors, a regional scale assessment over different seasons was performed. This assessment indicates that the influence of secondary factors on W is for the largest part imbedded in the exponent of the wind speed dependence. Hence no further improvement can be expected by looking at effects of other factors on the variation in W explicitly. From the regional analysis, a new globally applicable quadratic W(U10) parameterization was derived. An intrinsic correlation between W and U10 that could have been introduced while estimating W from TB was determined, evaluated and presumed to lie within the error margins of the newly derived W(U10) parameterization. The satellite-based parameterization was compared to parameterizations from other studies and was applied in a SSSF to estimate the global SSA emission rate. The thus obtained SSA production for 2006 of 4.1 × 1012 kg is within previously reported estimates. While recent studies that account for parameters other than U10 explicitly could be suitable to improve predictions of SSA emissions, we promote our new W(U10) parameterization as an alternative approach that implicitly accounts for these different parameters and helps to improve SSA emission estimates equally well.
Intercomparison of snowfall estimates derived from the CloudSat Cloud Profiling Radar and the ground based weather radar network over Sweden
Authors: Norin L. , Devasthale A. , L'Ecuyer T. S. , Wood N. B. , Smalley M.
Published: August 2015

Abstract. To be able to estimate snowfall accurately is important for both weather and climate applications. Ground-based weather radars and space-based satellite sensors are often used as viable alternatives to rain-gauges to estimate precipitation in this context. The Cloud Profiling Radar (CPR) onboard CloudSat is especially proving to be a useful tool to map snowfall globally, in part due to its high sensitivity to light precipitation and ability to provide near-global vertical structure. The importance of having snowfall estimates from CloudSat/CPR further increases in the high latitude regions as other ground-based observations become sparse and passive satellite sensors suffer from inherent limitations. Here we intercompared snowfall estimates from two observing systems, CloudSat and Swerad, the Swedish national weather radar network. Swerad offers one of the best calibrated data sets of precipitation amount at very high latitudes that are anchored to rain-gauges and that can be exploited to evaluate usefulness of CloudSat/CPR snowfall estimates in the polar regions. In total 7.2×105 matchups of CloudSat and Swerad over Sweden were inter-compared covering all but summer months (October to May) from 2008 to 2010. The intercomparison shows encouraging agreement between these two observing systems despite their different sensitivities and user applications. The best agreement is observed when CloudSat passes close to a Swerad station (46–82 km), when the observational conditions for both systems are comparable. Larger disagreements outside this range suggest that both platforms have difficulty with shallow snow but for different reasons. The correlation between Swerad and CloudSat degrades with increasing distance from the nearest Swerad station as Swerad's sensitivity decreases as a function of distance and Swerad also tends to overshoots low level precipitating systems further away from the station, leading to underestimation of snowfall rate and occasionally missing the precipitation altogether. Further investigations of various statistical metrics, such as the probability of detection, false alarm rate, hit rate, and the Hanssen–Kuipers skill scores, and the sensitivity of these metrics to snowfall rate and the distance from the radar station, were carried out. The results of these investigations highlight the strengths and the limitations of both observing systems at the lower and upper ends of snowfall distributions and the range of uncertainties that could be expected from these systems in the high latitude regions.
Probing the past 30-year phenology trend of US deciduous forests
Authors: Yue X. , Unger N. , Keenan T. F. , Zhang X. , Vogel C. S.
Published: August 2015

Abstract. Phenology is experiencing dramatic changes over deciduous forests in the USA. Estimates of trends in phenology on the continental scale are uncertain, however, with studies failing to agree on both the magnitude and spatial distribution of trends in spring and autumn. This is due to the sparsity of in situ records, uncertainties associated with remote sensing data, and the regional focus of many studies. It has been suggested that reported trends are a result of recent temperature changes, though multiple processes are thought to be involved and the nature of the temperature forcing remains unknown. To date, no study has directly attributed long-term phenological trends to individual forcings across the USA through integrating observations with models. Here, we construct an extensive database of ground measurements of phenological events across the USA, and use it to calibrate and evaluate a suite of phenology models. The models use variations of the accumulative temperature summation, with additional chilling requirements for spring phenology and photoperiod limitation for autumn. Including a chilling requirement or photoperiod limitation does not improve model performance, suggesting that temperature change, especially in spring and autumn, is likely the dominant driver of the observed trend during the past 3 decades. Our results show that phenological trends are not uniform over the contiguous USA, with a significant advance of 0.34 day yr−1 for the spring budburst in the east, a delay of 0.15 day yr−1 for the autumn dormancy onset in the northeast and west, but no evidence of change elsewhere. Relative to the 1980s, the growing season in the 2000s is extended by about 1 week (3–4 %) in the east, New England, and the upper Rocky Mountains forests. Additional sensitivity tests show that intraspecific variations may not influence the predicted phenological trends. These results help reconcile conflicting reports of phenological trends in the literature, and directly attribute observed trends to long-term changes in temperature.
Optical properties and bioavailability of dissolved organic matter along a flow-path continuum from soil pore waters to the Kolyma River, Siberia
Authors: Frey K. E. , Sobczak W. V. , Mann P. J. , Holmes R. M.
Published: August 2015

Abstract. The Kolyma River in Northeast Siberia is among the six largest arctic rivers and drains a region underlain by vast deposits of Holocene-aged peat and Pleistocene-aged loess known as yedoma, most of which is currently stored in ice-rich permafrost throughout the region. These peat and yedoma deposits are important sources of dissolved organic matter (DOM) to inland waters that in turn play a significant role in the transport and ultimate remineralization of organic carbon to CO2 and CH4 along the terrestrial flow-path continuum. The turnover and fate of terrigenous DOM during offshore transport will largely depend upon the composition and amount of carbon released to inland and coastal waters. Here, we measured the optical properties of chromophoric DOM (CDOM) from a geographically extensive collection of waters spanning soil pore waters, streams, rivers, and the Kolyma River mainstem throughout a ∼ 250 km transect of the northern Kolyma River basin. During the period of study, CDOM absorbance values were found to be robust proxies for the concentration of DOM, whereas additional CDOM parameters such as spectral slopes (S) were found to be useful indicators of DOM quality along the flow-path. In particular, CDOM absorption at 254 nm showed a strong relationship with dissolved organic carbon (DOC) concentrations across all water types (r2 = 0.958, p < 0.01). The spectral slope ratio (SR) of CDOM demonstrated statistically significant differences between all four water types and tracked changes in the concentration of bioavailable DOC, suggesting that this parameter may be suitable for clearly discriminating shifts in organic matter characteristics among water types along the full flow-path continuum across this landscape. The heterogeneity of environmental characteristics and extensive continuous permafrost of the Kolyma River basin combine to make this a critical region to investigate and monitor. With ongoing and future permafrost degradation, peat and yedoma deposits throughout the Northeast Siberian region will become more hydrologically active, providing greater amounts of DOM to fluvial networks and ultimately to the Arctic Ocean. The ability to rapidly and comprehensively monitor shifts in the quantity and quality of DOM across the landscape is therefore critical for understanding potential future feedbacks on the arctic carbon cycle.
Do land surface models need to include differential plant species responses to drought? Examining model predictions across a latitudinal gradient in Europe
Authors: De Kauwe M. G. , Zhou S.-X. , Medlyn B. E. , Pitman A. J. , Wang Y.-P. , Duursma R. A. , Prentice I. C.
Published: August 2015

Abstract. Future climate change has the potential to increase drought in many regions of the globe, making it essential that land surface models (LSMs) used in coupled climate models, realistically capture the drought responses of vegetation. Recent data syntheses show that drought sensitivity varies considerably among plants from different climate zones, but state-of-the-art LSMs currently assume the same drought sensitivity for all vegetation. We tested whether variable drought sensitivities are needed to explain the observed large-scale patterns of drought impact. We implemented data-driven drought sensitivities in the Community Atmosphere Biosphere Land Exchange (CABLE) LSM and evaluated alternative sensitivities across a latitudinal gradient in Europe during the 2003 heatwave. The model predicted an overly abrupt onset of drought unless average soil water potential was calculated with dynamic weighting across soil layers. We found that high drought sensitivity at the northernmost sites, and low drought sensitivity at the southernmost sites, was necessary to accurately model responses during drought. Our results indicate that LSMs will over-estimate drought impacts in drier climates unless different sensitivity of vegetation to drought is taken into account.
PLUME-MoM 1.0: A new integral model of volcanic plumes based on the method of moments
Authors: de' Michieli Vitturi M. , Neri A. , Barsotti S.
Published: August 2015

Abstract. In this paper a new integral mathematical model for volcanic plumes, named PLUME-MoM, is presented. The model describes the steady-state dynamics of a plume in a 3-D coordinate system, accounting for continuous variability in particle size distribution of the pyroclastic mixture ejected at the vent. Volcanic plumes are composed of pyroclastic particles of many different sizes ranging from a few microns up to several centimeters and more. A proper description of such a multi-particle nature is crucial when quantifying changes in grain-size distribution along the plume and, therefore, for better characterization of source conditions of ash dispersal models. The new model is based on the method of moments, which allows for a description of the pyroclastic mixture dynamics not only in the spatial domain but also in the space of parameters of the continuous size distribution of the particles. This is achieved by formulation of fundamental transport equations for the multi-particle mixture with respect to the different moments of the grain-size distribution. Different formulations, in terms of the distribution of the particle number, as well as of the mass distribution expressed in terms of the Krumbein log scale, are also derived. Comparison between the new moments-based formulation and the classical approach, based on the discretization of the mixture in N discrete phases, shows that the new model allows for the same results to be obtained with a significantly lower computational cost (particularly when a large number of discrete phases is adopted). Application of the new model, coupled with uncertainty quantification and global sensitivity analyses, enables the investigation of the response of four key output variables (mean and standard deviation of the grain-size distribution at the top of the plume, plume height and amount of mass lost by the plume during the ascent) to changes in the main input parameters (mean and standard deviation) characterizing the pyroclastic mixture at the base of the plume. Results show that, for the range of parameters investigated and without considering interparticle processes such as aggregation or comminution, the grain-size distribution at the top of the plume is remarkably similar to that at the base and that the plume height is only weakly affected by the parameters of the grain distribution. The adopted approach can be potentially extended to the consideration of key particle–particle effects occurring in the plume including particle aggregation and fragmentation.
Estimating evapotranspiration with thermal UAV data and two source energy balance models
Authors: Hoffmann H. , Nieto H. , Jensen R. , Guzinski R. , Zarco-Tejada P. J. , Friborg T.
Published: August 2015

Abstract. Estimating evapotranspiration is important when managing water resources and cultivating crops. Evapotranspiration can be estimated using land surface heat flux models and remotely sensed land surface temperatures (LST) which recently have become obtainable in very high resolution using Unmanned Aerial Vehicles (UAVs). Very high resolution LST can give insight into e.g. distributed crop conditions within cultivated fields. In this study evapotranspiration is estimated using LST retrieved with a UAV and the physically-based, two source energy balance models: the Priestley–Taylor TSEB (TSEB-PT) and the Dual-Temperature-Difference (DTD). A fixed-wing UAV was flown over a barley field in western Denmark during the spring and summer in 2014 and retrieved images of LST is successfully processed into thermal mosaics which serve as model input for both TSEB-PT and DTD. The aim is to assess whether a lightweight thermal camera mounted on a UAV is able to provide data of sufficient quality to obtain high spatial and temporal resolution surface energy heat fluxes. Furthermore, this study evaluates the performance of the two source energy balance (TSEB) model scheme during cloudy and overcast weather conditions. This is feasible due to the low data retrieval altitude compared to satellite thermal data that are only available during clear skies and sunny conditions. Flux estimates from TSEB-PT and DTD are compared and validated against field data collected using an eddy covariance system located at same site at which the UAV flights were conducted. Furthermore, spatially distributed evapotranspiration patterns are evaluated using known irrigation patterns. Evapotranspiration is well estimated by both TSEB-PT and DTD with DTD as the best predictor. The DTD model provides results comparable to studies estimating evapotranspiration with satellite retrieved LST and physical land-surface models. This study shows that the UAV platform and the lightweight thermal camera provide high spatial and temporal resolution data valid for model input and for other potential applications requiring high resolution and consistent LST. Lastly, this study explicates thermal UAV data processing and the mosaicking of images into ortho-photos suited for model input.
Dynamics of large wood during a flash flood in two mountain catchments
Authors: Lucía A. , Comiti F. , Borga M. , Cavalli M. , Marchi L.
Published: August 2015

Abstract. Understanding and modelling the dynamics of large wood (LW) in rivers during flood events has spurred a great deal of research in recent years. However, few studies have documented the effect of high-magnitude flash floods on LW recruitment, transport and deposition. On 25 October 2011, the Magra river basin (north-western Italy) was hit by an intense rainstorm, with hourly rainfall rates up to 130 mm h−1 and event rain accumulations up to 540 mm in 8 h. Such large rainfall intensities originated flash floods in the main river channels and in several tributaries, causing severe damages and loss of lives. Numerous bridges were partly or fully clogged by LW jams. A post-flood survey was carried out along the channels of two catchments that were severely and similarly affected by this event, the Gravegnola (34.3 km2) and Pogliaschina (25.1 km2). The analysis highlighted a very relevant channel widening in many channel reaches, which was more marked in the Gravegnola basin due to highly erodible material forming the slopes adjacent to the fluvial corridor. Large wood recruitment rates were very high, up to 1270 m3 km−1, and most of it (70–80 %) was eroded from the floodplains as a consequence of channel-widening processes, while the rest came from hillslopes processes. Overall, drainage area and channel slope are the most relevant controlling variables in explaining the reach-scale variability of LW recruitment, whereas LW deposition appears to be more complex, as correlation analysis did not evidence any statistically significant relationship with the tested controlling variables. Indeed, in-channel LW displacement during the flood has been mostly limited by the presence of bridges, given the relatively large width attained by channels after the event.
Response of the large-scale subglacial drainage system of Northeast Greenland to surface elevation changes
Authors: Karlsson N. B. , Dahl-Jensen D.
Published: August 2015

Abstract. The influence of subglacial water on the dynamics of ice flow has been the object of increasing interest in the past decade. In this study we focus on large-scale, long-term changes in surface elevation over Northeast Greenland and the corresponding changes in subglacial water routeways. Our results show that over timescales ranging from decades to millennia the area may experience redistribution of and fluctuation in subglacial water outflux under the main glacier outlets. The fluctuations in subglacial water routing occur even in the absence of external forcing. Based on these results we conclude that changes in the subglacial water routeways are an intrinsic part of the drainage basin dynamics, where the subglacial system is likely always in a transient state. The results also imply that fluctuations at the margins observed at present might originate from changes several hundred kilometres upstream. Since surface elevation changes may propagate upstream over timescales much longer than the observational period, the cause of the fluctuations may not be present in current observational records.
Recent changes in north-west Greenland climate documented by NEEM shallow ice core data and simulations, and implications for past-temperature reconstructions
Authors: Masson-Delmotte V. , Steen-Larsen H. C. , Ortega P. , Swingedouw D. , Popp T. , Vinther B. M. , Oerter H. , Sveinbjornsdottir A. E. , Gudlaugsdottir H. , Box J. E. , Falourd S. , Fettweis X. , Gallée H. , Garnier E. , Gkinis V. , Jouzel J. , Landais A. , Minster B. , Paradis N. , Orsi A. , Risi C. , Werner M. , White J. W. C.
Published: August 2015

Abstract. Combined records of snow accumulation rate, δ18O and deuterium excess were produced from several shallow ice cores and snow pits at NEEM (North Greenland Eemian Ice Drilling), covering the period from 1724 to 2007. They are used to investigate recent climate variability and characterise the isotope–temperature relationship. We find that NEEM records are only weakly affected by inter-annual changes in the North Atlantic Oscillation. Decadal δ18O and accumulation variability is related to North Atlantic sea surface temperature and is enhanced at the beginning of the 19th century. No long-term trend is observed in the accumulation record. By contrast, NEEM δ18O shows multidecadal increasing trends in the late 19th century and since the 1980s. The strongest annual positive δ18O values are recorded at NEEM in 1928 and 2010, while maximum accumulation occurs in 1933. The last decade is the most enriched in δ18O (warmest), while the 11-year periods with the strongest depletion (coldest) are depicted at NEEM in 1815–1825 and 1836–1846, which are also the driest 11-year periods. The NEEM accumulation and δ18O records are strongly correlated with outputs from atmospheric models, nudged to atmospheric reanalyses. Best performance is observed for ERA reanalyses. Gridded temperature reconstructions, instrumental data and model outputs at NEEM are used to estimate the multidecadal accumulation–temperature and δ18O–temperature relationships for the strong warming period in 1979–2007. The accumulation sensitivity to temperature is estimated at 11 ± 2 % °C−1 and the δ18O–temperature slope at 1.1 ± 0.2 ‰ °C−1, about twice as large as previously used to estimate last interglacial temperature change from the bottom part of the NEEM deep ice core.
Forensic entomology in Malaysia: knowledge and practices
Authors: Rajagopal Kavitha , Chye Tan Tian , Jeffery John , Sofian-Azirun Mohd
Published: August 2015

Background: This cross-sectional survey is to our knowledge the first attempt in Malaysia to study forensic entomology knowledge and practices among relevant Malaysian practitioners. Analysis of our questionnaire identified three major themes: understanding of forensic entomology, the acceptance and application of forensic entomology in crime scene investigation, and future directions for forensic entomology in Malaysia. We found that only a few experienced crime scene police officers had a meaningful knowledge of forensic entomology and were involved in maggot collecting during crime scene investigation.

Objectives: To assess knowledge, attitude, and practice of forensic entomology among relevant practitioners in Malaysia.

Methods: A total of 402 relevant practitioners were asked to complete a questionnaire regarding knowledge, attitude and practice of forensic entomology.

Results: Half of the respondents had some understanding that forensic entomology is a study of insects found on a dead human body. The study also found that forensic entomology research in Malaysia is mainly to determine the postmortem interval (PMI), to identify the types of flies, and to study insect maturation and succession; particularly of local species. The Malaysian government should be encouraged to play a role through the Department of Education to attract more students to this field and to support academic institutions to formulate research in forensic entomology.

Conclusions: Forensic entomology in Malaysia needs improvement of technical knowledge and awareness among relevant practitioners through curriculum development, policy, and training programs.
Outcome of antenatal hydronephrosis in northeastern Thailand
Authors: Paopongsawan Pongsatorn , Wisanuyotin Suwannee , Komwilaisak Ratana , Jirapradittha Junya , Jiravuttipong Apichat , Kiatchoosakun Pakaphan
Published: August 2015

Background: Antenatal hydronephrosis (ANH) is a condition characterized by fetal renal pelvic dilatation during pregnancy. It is detected in 1%-5% of all pregnancies. Most cases of ANH are physiological in nature, but some are pathological and can cause morbidity.

Objective: To determine: (a) the causes of ANH; (b) the factors associated with complications; and, (c) the factors associated with surgical intervention.

Methods: We reviewed the medical records of infants diagnosed with ANH; defined by a renal pelvic anteroposterior diameter ≥5 mm (based on antenatal ultrasonography) and being followed-up at Srinagarind Hospital.

Results: Forty-six infants (32 boys and 14 girls) with ANH were identified. Over half (57%) were born in our hospital (in-hospital) with the condition. The two most common causes of ANH were ureteropelvic junction obstruction (32%) and transient hydronephrosis (22%). Of the 63 abnormal kidneys, 52% needed surgical intervention. Twenty-two patients (48%) had urinary tract infections and most had more than 1 episode. None of the 46 patients had end-stage renal disease, but one died because of lung hypoplasia during the neonatal period. The severity of ANH and time of first postnatal ultrasonography were related to medical complications, while bilateral ANH and more severe ANH were associated with the need for surgical intervention. A milder degree of ANH and postnatal ultrasound findings were significantly associated with transient hydronephrosis.

Conclusion: Most cases of ANH were pathological and half required surgical intervention. Severe ANH and delayed investigation were associated with poor outcomes.
PCR amplification of a putative gene for exo-1,3-β-glucanase to identify the pathogenic oomycete Pythium insidiosum
Authors: Keeratijarut Angsana , Lohnoo Tassanee , Yingyong Wanta , Nampoon Umporn , Lerksuthirat Tassanee , Onpaew Pornpit , Chongtrakool Piriyaporn , Krajaejun Theerapong
Published: August 2015

Background: Pythium insidiosum is the etiologic agent of pythiosis, a life-threatening infectious disease. Diagnosis of pythiosis is difficult and often delayed. Early diagnosis can lead to prompt treatment, and therefore a better prognosis for patients with pythiosis. Molecular diagnostic techniques are useful if microbiological and immunological assays are not available, or in cases of suspected pythiosis that test negative by other methods. So far, PCR identification of P. insidiosum has been largely relied on amplification of the rDNA region.

Objective: To evaluate the diagnostic performance of Dx3 and Dx4 primers specific for a putative gene for exo- 1,3-β-glucanase (PinsEXO1), which encodes a specific immunogen of P. insidiosum, for rapid single-round PCR identification of P. insidiosum, in comparison with the previously-reported rDNA-specific primers, ITSpy1 and ITSpy2.

Materials and Methods: Genomic DNA (gDNA) from 35 P. insidiosum isolates and 48 control organisms were prepared to evaluate the diagnostic performance of the PinsEXO1- and rDNA-specific primers.

Results: When amplifying the control gDNA by using the Dx3/4 and ITSpy1/2 primer sets, no PCR product was observed, indicating that both primer sets had 100% detection specificity. When amplifying the P. insidiosum gDNA, the Dx3/4 primers provided an expected 550-bp amplicon for all 35 isolates, while the ITSpy1/2 primers provided an expected 230-bp amplicon for only 32 isolates. Thus, detection sensitivity of the Dx3/4 and ITSpy1/2 primer sets were 100% and 91%, respectively.

Conclusion: By using the Dx3/4 primers, PinsEXO1 was an alternative, efficient, and novel PCR target for rapid single-round PCR identification of P. insidiosum.
Exercise intolerance in obese children and adolescents
Authors: Ruangnapa Kanokpan , Sritippayawan Suchada , Sanguanrungsirikul Sompol , Deerojanawong Jitladda , Prapphal Nuanchan
Published: August 2015

Background: Abnormal lung function has been reported in the obese population and is associated with the severity of obesity.

Objectives: To identify abnormal lung function in obese children and adolescents, and examine the cardiopulmonary response of those who have abnormal lung functions during exercise, and to reveal predictors of exercise intolerance in this population.

Methods: Fifty obese participants aged 8–18 years (56% male; mean age 13.2 ± 2.0 years; mean BMI 33.0 ± 3.6 kg/m2, mean BMI z score 3.1 ± 0.3) underwent spirometry, lung volume evaluation, and a cardiopulmonary exercise test.

Results: Lung function abnormalities and exercise intolerance because of pulmonary limitations were found in 36% and 74% of the participants, respectively. A comparison of participants with normal and abnormal lung functions revealed a lower breathing reserve and a higher ventilatory equivalent for CO2 production (VE/VCO2) during exercise in those who had lung function abnormalities (18 ± 15 vs 30±10%, P <0.001 and 30.3 ± 3.3 vs 29.6 ± 3.1; P = 0.02, respectively). Exercise intolerant participants had a higher BMI z score compared with those who were not (3.1 ± 0.3 vs 2.9 ± 0.3; P = 0.03). BMI z score ≥ 2.84 had an 80% sensitivity and 67% specificity for predicting exercise intolerance in this population.

Conclusions: Evaluations of lung function and exercise capacity should be included in the follow-up planning for obese children and adolescents. A BMI z score ≥ 2.84 was most sensitive for predicting exercise intolerance in this population.
Factors influencing decisions of Laotian patients to use health care services in Thailand
Authors: Charoenmukayananta Suwaree , Sriratanaban Jiruth , Hengpraprom Sarunya , Trarathep Chanvit
Published: August 2015

Background: Thailand has been facing a gradual increase in use of cross-border health care. Nevertheless, no evidence regarding factors influencing cross-border use of health care by Laotian patients in public Thai hospitals among this group has been established.

Objectives: To assess the use of cross-border health care by Laotian patients, and factors that may influence health services in public Thai hospitals along the border.

Methods: This study consisted of two parts. (1) Site-visits to 53 Thai public hospitals along the Thai-Laos border during May to July 2011 and collection of data regarding the use of health care services by Laotian patients. (2) A structured questionnaire survey was conducted via face interviews by trained researchers. Findings were analyzed using descriptive statistics and multiple logistic regression.

Results: The most common conditions for which treatment was sought were common diseases and basic operative procedures. All hospitals had been facing substantial financial burden, particularly for inpatient care. The analysis of use indicated that a perception of differences in the quality of health services, ability to pay for treatment anywhere, and distance to health services were three major factors affecting the decision of Laotian patients to cross the border to obtain health care in Thailand. Interviews with hospital directors and staff revealed that more financial support and a clear policy for care of Laotian patients was needed.

Conclusions: The perception of better quality of health care in Thailand by Laotian patients was the major factor affecting cross-border use of health care services. Assistance to improve healthcare in Laos and financial support for subsidizing care for the indigent Laotian patients is needed.
Progressive outer retinal necrosis in an immunocompromised patient presenting with bilateral retrobulbar optic neuritis
Authors: Jariyakosol Supharat , Pongsachareonnont Pear , Sitthanon Supapan
Published: August 2015

Background: Progressive outer retinal necrosis (PORN) is a necrotizing chorioretinopathy caused by herpes simplex virus, varicella-zoster virus, or cytomegalovirus.

Objective: To describe the clinical morphology of PORN presenting with asymmetrical isolated bilateral retrobulbar optic neuropathy.

Method: The medical records of a 45-year-old human immunodeficiency virus infected patient presenting with bilateral visual loss at King Chulalongkorn Memorial Hospital were reviewed with respect for the privacy of patient.

Result: Gradual visual loss progressed to no light perception in the right eye and 20/200 in the left eye within 1 month. The patient was initially diagnosed with retrobulbar optic neuritis in both eyes. The investigations included MRI, vitreous tapping, lumbar puncture, and serological testing. MRI elicited enhancement around both optic nerves, which suggested optic neuritis. Thereafter, multifocal areas of retinal necrosis developed with rapid progression and additional cutaneous zoster lesions were established. These findings led to a diagnosis of PORN. The patient was promptly treated with intravenous ganciclovir, anti-retroviral therapy, and vitrectomy with endophotocoagulation and silicone injection. Unfortunately, his visual prognosis in the left eye was still poor

Conclusion: PORN was uncommonly present with bilateral isolated optic neuropathy before retinal lesions developed. Retrobulbar optic neuropathy from herpetic infection in immunocompromised patients should be considered despite a normal fundus at initial presentation. Early diagnosis and prompt intervention may preserve vision. This case demonstrates the importance of careful physical examination and follow up of retinal lesions.
Original article. Articulation disorders and patterns in children with a cleft
Authors: Prathanee Benjamas , Seepuaham Cholada , Pumnum Tawitree
Published: August 2015

Background: Compensatory articulation disorders (CAD) are the most common speech defects in patients with a cleft. Early prevention programs are needed to avoid CAD.

Objectives: To examine articulation disorders, patterns, and related speech outcomes in children with a cleft palate with or without lip defects.

Methods: Articulation test record forms and clinical records of 42 children were accessed retrospectively to provide the data of speech outcomes related to cleft palate. Double data entries and incorrect completion type errors were corrected.

Results: Prevalence of articulatory defects was 88% (functional articulation disorders, 12%; compensatory articulation disorders, 10%; functional articulation disorders and CAD, 67%), resonance disorder was 50%, and voice abnormalities was 19%. Abnormal backing of oral consonants, particularly glottal substitution was the most common pattern of CAD (40%), follow by velar substitution (36%), and nasal consonant for oral pressure consonant (21%). There was high incidence of functional articulation disorder in patients with a cleft (76%). Younger children (≤7 years old) had more articulation defects than older children (>7 years old) (mean difference = 3.308, P = 0.002, 95% confident interval 1.683-6.971). Levene’s test for equal variance found that resonance disorder seems unaffected by the number of articulation errors (mean difference = 0.253, P = 0.897, 95% confident interval -3.736-4.241).

Conclusion: CAD, particularly abnormal backing of oral consonants and hypernasality were the most common speech defects in children with cleft. Refinement and revision of timing for referring for early speech intervention should be reconsidered.
Original article. Trends and characteristics of childhood diabetes in a tertiary care center in Thailand
Authors: Trepatchayakorn Sirawut , Supornsilchai Vichit , Wacharasindhu Suttipong , Aroonparkmongkol Suphab , Sahakitrungruang Taninee
Published: August 2015

Background: Reports on characteristics of pediatric diabetes in children from Southeast Asian countries are limited.

Objectives: To describe the clinical characteristics, prevalence, glycemic control, and current treatment regimens of diabetes in Thai children.

Materials and Methods: Data from 132 patients seen at our pediatric diabetes clinic at Chulalongkorn University during 2001−2013 were retrospectively reviewed.

Results: We found an increasing number of patients newly-diagnosed with type 1- (T1DM) or type 2- diabetes mellitus (T2DM). The overall proportion of T1DM was 69.7%, T2DM 23.4%, and other types 6.9%. Children with T1DM were younger at diagnosis, had higher initial glucose and glycated hemoglobin A1c (HbA1c), a lower body mass index z-score, lower C-peptide and insulin levels, and were more likely to have classic diabetes symptoms and ketoacidosis, compared with children with T2DM. Mixed diabetes phenotypes were found in about 12%−14% of these children. Glutamic acid decarboxylase and islet antigen-2 autoantibodies were found in 70% and 54% of T1DM patients, respectively, and not in T2DM patients. HbA1c in T1DM was 9.6 ± 2.2% total hemoglobin, and in T2DM was 7.9 ± 2.6%. There were no differences in HbA1c levels between different insulin regimens in the T1DM group.

Conclusion: The number of children with T1DM or T2DM has been increasing and there are overlapping phenotypes in a significant proportion of these children. Correct diagnosis requires clinical evaluation and monitoring of the clinical course. Further research is needed to determine the risk factors for the poor glycemic control found in children with T1DM.
Original article. Factors facilitating the emergence of domestic violence in Turkey
Authors: Yaman Sengül , Taskin Lale
Published: August 2015

Background: Domestic violence is seen in all communities.

Objectives: To determine the risk factors that facilitate emergence of domestic violence.

Methods: A qualitative study where in-depth interviews were used. A total of 30 women who stated they had been experiencing violence from their partner for at least a year made up the study sample. The common opinions in the interviews were grouped and coded according to the themes created for “descriptive analysis”. Excerpts from the statements that best emphasized/defined the women’s opinions and experiences were used in the study report.

Results: The factors stated by the women as facilitating the emergence of domestic violence in our study were: the man being older, the woman being in a marriage that she did not want, was forced into, or that her family did not want, a lack of support by the woman’s family, the man’s family not wanting the woman, the man seeing violence as a societal right, and a lack of mutual love, respect, or trust in the marriage/relationship.

Conclusions: To decrease the emergence of domestic violence in the Turkish family system where traditional female-male roles are present: the woman and man within the marriage/relationship should have similar sociodemographic attributes (age, education, employment), the decision for marriage/relationship should be with the woman’s own free will, educational and awareness increasing programs to ensure societal change should be arranged, and the quality and quantity of social institutions should be brought to a level where the support systems for women can be strengthened.
Brief communication (Original). Prevalence and risk factors for deep vein thrombosis in hospitalized high-risk patients at a tertiary care hospital in Thailand
Authors: Wongkhantee Somchai , Jennetisin Vigrom , Anukulanantchai Thitima , Sawanyawisuth Kittisak
Published: August 2015

Background: Deep vein thrombosis (DVT) is a silent killer in hospitalized patients. Its prevalence in Thai population may be different from Western countries.

Objective: To evaluate recognized risk factors for DVT in high-risk Thai patients according to the American College of Chest Physicians (ACCP).

Methods: Hospitalized patients were prospectively enrolled at the Department of Medicine, Khon Kean Hospital. The study period was January 2010 to March 2011. Inclusion criteria were patients who were admitted with either (1) heart or respiratory failure or (2) one of the following conditions: cancer, sepsis, acute stroke, or inflammatory bowel disease. The admission length was at least four days. Patients were excluded if the hospitalization was because of venous thromboembolism or if there was a requirement for heparin therapy.

Results: One hundred patients met the study criteria during the study. Of those, 5 patients (5%) had evidence of DVT by ultrasonography. None of these patients had pulmonary embolisms by computed tomographic angiography. In the multiple logistic regression analysis, only acute stroke was significantly associated with DVT. The adjusted odds ratio (OR) was 19.72; (95% confidence interval (CI) 1.37, 284.37). DVT was the only significant factor associated with death during admission with adjusted OR of 30.76 (95% CI: 2.02, 469.03).

Conclusions: The prevalence of DVT in hospitalized high-risk patients by ACCP criteria was low. Admission because of acute stroke may increase the risk of DVT and having DVT may result in high mortality.
Brief communication (Original). Trends in neonatal sepsis in a neonatal intensive care unit in Thailand before and after construction of a new facility
Authors: Thatrimontrichai Anucha , Chanvitan Prasin , Janjindamai Waricha , Dissaneevate Supaporn , Jefferies Ann , Shah Vibhuti
Published: August 2015

Background: Neonatal sepsis is a cause of mortality and long-term morbidity worldwide.

Objectives: To describe longitudinal trends in the cumulative incidence of early- and late-onset sepsis (EOS and LOS), mortality, and causative organisms in a Thai Hospital before and after construction of a new neonatal intensive care unit (NICU).

Methods: Review of NICU admissions with blood cultures positive for bacteria or fungi for the periods 1995 to 2002 (preconstruction) and 2004 to 2010 (postconstruction). Sepsis was categorized into EOS (within first 3 days of life) and LOS (after first 3 days of life).

Results: Of 5,570 admissions, 241 (4.3%) neonates with 276 episodes of sepsis were identified. There was no difference in the rate of sepsis overall (P = 0.90), LOS (P = 0.30), or sepsis-related mortality (P = 0.61) over the two periods, but the rate of EOS increased significantly from 0.34% to 0.81% (P = 0.04). Rates of Klebsiella species and Escherichia coli sepsis increased from 13.6% to 25.6% (P = 0.01) and from 5.3% to 12.2% (P = 0.04), respectively, while rates of Staphylococcus aureus sepsis decreased from 12.9% to 4.3% (P < 0.007). Sepsisrelated mortality was 1.8%.

Conclusions: Although direct causality cannot be proven, the rate of EOS and the pattern of causative organisms changed following construction of the new NICU. Building a new unit does not necessarily result in a reduction in the rate of sepsis. This data may provide a baseline for implementing evidence-based infection control strategies to prevent/reduce sepsis and improve neonatal care.
Brief communication (Original). Anorectal physiology evaluation after male-to-female sex reassignment surgery
Authors: Pungrasmi Pornthep , Meevassana Jiraroch , Tantiphlachiva Kassaya , Suwajo Poonpissamai , Angspatt Apichai , Jindarak Sirachai , Chokrungvaranont Prayuth
Published: August 2015

Background: Male-to-female sex reassignment surgery (MTF-SRS) is a treatment for gender identity disorders (GID) wherein the penis is removed and an epithelialized neovagina is created in the retroprostatic or rectovesical space. This is a space between the double layers of Denonvilliers’ fascia that contains motor, sensory, and autonomic nerves to the pelvic organs. Injury to these nerves may lead to anorectal dysfunction. However, there has been no objective study of anorectal physiologic changes after SRS.

Objectives: To compare anorectal physiological parameters, before and after, male-to-female sex reassignment surgery (SRS) and to evaluate the effects of SRS on anorectal physiology.

Methods: In 10 patients with MTF GID who underwent SRS at King Chulalongkorn Memorial Hospital, anorectal manometry was performed using a water perfused catheter (Mui Scientific, Ontario, Canada) and a state-of-the-art anorectal manometry system (Medtronic, Minneapolis, MN, USA) at the Gastrointestinal Motility Research Unit at 2 weeks before and 3 months after the SRS. Data were analyzed using PolygramNet software. Anal sphincter pressures (mmHg) with volume used to elicit rectal sensation (mL).

Results: There was no significant change in the resting anal sphincter pressure, anal sphincter squeezing pressure, sustained squeezing pressure, and duration of squeeze, rectal sensation, and threshold of the desire to defecate affected by SRS. Cough reflex and rectoanal inhibitory reflex were normal both before and after SRS in all patient participants.

Conclusions: Sex reassignment surgery seems to produce no effect on clinical anorectal functions. This was proven by absence of clinically significant changes in anorectal manometry.
Indigenous Voices on the Web: Folksonomies and Endangered Languages
Authors: Cocq Coppélie
Published: August 2015

Examining categories created by Sami users on Twitter, this article investigates the advantages and limits of global social media for a small localized group. Folksonomies illustrate the empowering potential of Twitter as a site of performance for continuity of cultural practices, vernacular expressions, and "artistic communication in small groups" (Ben-Amos 1971).
What Bronies See When They Brohoof: Queering Animation on the Dark and Evil Internet
Authors: Ellis Bill
Published: August 2015

After the cartoon series My Little Pony: Friendship Is Magic began airing in 2010, a network of adult fans, predominantly young males, formed an Internet-based vernacular culture in homage. Calling themselves "bronies," this virtual community circulated "photoshops," computer-generated visual humor, and discussed them online using an emic folk speech called "bronyspeak." This article examines several photoshops in the context of the discussions in which they emerged. Bronies, like earlier fan groups, poach elements from the original show, "queer them" in consciously transgressive ways, and use them to challenge prevailing attitudes toward gender and sexual orientation in graceful, yet disturbing ways.
Caveat Lector: Fake News as Folklore
Authors: Frank Russell
Published: August 2015

We are awash in words and images that sound and look like real news, but are not. This article considers certain kinds of fake news as a genre of digital folklore and attempts to sort out the differences among fake news hoaxes, pranks, satires, and parodies. It offers examples of each and tries to show how fake news functions as folk political commentary or folk media criticism.
Tall, Dark, and Loathsome: The Emergence of a Legend Cycle in the Digital Age
Authors: Peck Andrew
Published: August 2015

The faceless, tall, eerily long-limbed humanoid clad in a black suit emerged in an online forum as a pair of photoshops and a half-dozen lines of text. Soon, this so-called "Slender Man" began appearing in images, videos, stories, and blogs across the Internet. By sharing, discussing, and commenting on these artifacts using participatory media, users create legendary narratives and audio/visual "evidence" that present researchers with a new kind of digital folk practice. Enabled by the affordances of digital and social networks, this digital legend cycle serves as an example of a new form of digital folklore that combines the generic conventions of oral and visual storytelling with the collaborative potential of networked communication.
Bryan og Rudd: Managing suicide risk in primary care
Authors: Larsen Kim
Published: August 2015

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