bluuebunny/crossref_metadata_2025_split huggingface dataset:
Experimental nutrient enrichment of forest streams increases energy flow to predators along greener food‐web pathways
Authors: Bumpers Phillip M. , Rosemond Amy D. , Maerz John C. , Benstead Jonathan P. 
Published: August 2017

Abstract

Nutrient enrichment is a key stressor of lakes and streams globally, affecting the relative availability of important basal resources such as algae and detritus. These effects are controlled by responses of autotrophic and heterotrophic microorganisms that subsequently affect primary consumers and higher level predators. Despite the potential for propagation of these bottom‐up effects, few studies have examined how nutrients affect “green” (autotrophic) versus “brown” (heterotrophic) energy pathways to predators via changes in the quantity or type of prey consumed.

We studied the pathways by which nutrient enrichment affected two predatory salamander species (Desmognathus quadramaculatus and Eurycea wilderae) using detailed diet analyses before and during 2‐year nutrient additions to five headwater forest streams. The streams were continuously enriched with different concentrations of dissolved nitrogen (N) and phosphorus (P), creating relatively greater N or P concentrations and distinct N:P ratios (2:1, 8:1, 16:1, 32:1 and 128:1) in each stream.

Nutrient addition resulted in greater prey number, size and biomass consumed by D. quadramaculatus, an effect driven more by P than by N additions. Some of these effects were greater in the second year of enrichment and were greater for larger individuals. Shifts in the prey composition of D. quadramaculatus included increases in algivores and decreases in detritivores, tracking observed treatment effects on basal resource quantity (e.g. algivore abundance in guts was related to algal biomass, which increased with enrichment, and detritivore abundance in guts was related to detrital standing stocks, which declined with enrichment). For E. wilderae diets, there was limited evidence for increased prey size and number, or for alteration of prey composition with enrichment despite evidence of increased larval growth. We hypothesise that body size differences between the two salamander species partially explain their different dietary responses to enrichment.

Our results show that nutrient addition, primarily of P, affected the quantity and composition of predator diets in our nutrient‐poor streams. These effects on diet were consistent with concurrent studies showing that P enrichment resulted in faster growth of salamanders and occurred partly via effects on algal biofilm or “green” food‐web pathways, despite the dominance of detrital or “brown” resources in our heavily shaded forest stream sites. Thus, nutrient enrichment can promote algae‐ versus detritus‐based energy‐flow pathways in nominally light‐limited stream ecosystems, with associated changes in food‐web characteristics and function.
Climate change and Saharan dust drive recent cladoceran and primary production changes in remote alpine lakes of Sierra Nevada, Spain
Authors: Jiménez Laura , Rühland Kathleen M. , Jeziorski Adam , Smol John P. , Pérez‐Martínez Carmen 
Published: August 2017

AbstractRecent anthropogenic climate change and the exponential increase over the past few decades of Saharan dust deposition, containing ecologically important inputs of phosphorus (P) and calcium (Ca), are potentially affecting remote aquatic ecosystems. In this study, we examine changes in cladoceran assemblage composition and chlorophyll‐a concentrations over the past ~150 years from high‐resolution, well‐dated sediment cores retrieved from six remote high mountain lakes in the Sierra Nevada Mountains of Southern Spain, a region affected by Saharan dust deposition. In each lake, marked shifts in cladoceran assemblages and chlorophyll‐a concentrations in recent decades indicate a regional‐scale response to climate and Saharan dust deposition. Chlorophyll‐a concentrations have increased since the 1970s, consistent with a response to rising air temperatures and the intensification of atmospheric deposition of Saharan P. Similar shifts in cladoceran taxa across lakes began over a century ago, but have intensified over the past ~50 years, concurrent with trends in regional air temperature, precipitation, and increased Saharan dust deposition. An abrupt increase in the relative abundance of the benthic cladoceran Alona quadrangularis at the expense of Chydorus sphaericus, and a significant increase in Daphnia pulex gr. was a common trend in these softwater lakes. Differences in the magnitude and timing of these changes are likely due to catchment and lake‐specific differences. In contrast with other alpine lakes that are often affected by acid deposition, atmospheric Ca deposition appears to be a significant explanatory factor, among others, for the changes in the lake biota of Sierra Nevada that has not been previously considered. The effects observed in Sierra Nevada are likely occurring in other Mediterranean lake districts, especially in softwater, oligotrophic lakes. The predicted increases in global temperature and Saharan dust deposition in the future will further impact the ecological condition of these ecosystems.
Simulating plant invasion dynamics in mountain ecosystems under global change scenarios
Authors: Carboni Marta , Guéguen Maya , Barros Ceres , Georges Damien , Boulangeat Isabelle , Douzet Rolland , Dullinger Stefan , Klonner Guenther , van Kleunen Mark , Essl Franz , Bossdorf Oliver , Haeuser Emily , Talluto Matthew V. , Moser Dietmar , Block Svenja , Conti Luisa , Dullinger Iwona , Münkemüller Tamara , Thuiller Wilfried 
Published: August 2017

AbstractAcross the globe, invasive alien species cause severe environmental changes, altering species composition and ecosystem functions. So far, mountain areas have mostly been spared from large‐scale invasions. However, climate change, land‐use abandonment, the development of tourism and the increasing ornamental trade will weaken the barriers to invasions in these systems. Understanding how alien species will react and how native communities will influence their success is thus of prime importance in a management perspective. Here, we used a spatially and temporally explicit simulation model to forecast invasion risks in a protected mountain area in the French Alps under future conditions. We combined scenarios of climate change, land‐use abandonment and tourism‐linked increases in propagule pressure to test if the spread of alien species in the region will increase in the future. We modelled already naturalized alien species and new ornamental plants, accounting for interactions among global change components, and also competition with the native vegetation. Our results show that propagule pressure and climate change will interact to increase overall species richness of both naturalized aliens and new ornamentals, as well as their upper elevational limits and regional range‐sizes. Under climate change, woody aliens are predicted to more than double in range‐size and herbaceous species to occupy up to 20% of the park area. In contrast, land‐use abandonment will open new invasion opportunities for woody aliens, but decrease invasion probability for naturalized and ornamental alien herbs as a consequence of colonization by native trees. This emphasizes the importance of interactions with the native vegetation either for facilitating or potentially for curbing invasions. Overall, our work highlights an additional and previously underestimated threat for the fragile mountain flora of the Alps already facing climate changes, land‐use transformations and overexploitation by tourism.
When empathy hurts: Modelling university students’ word of mouth behaviour in public vs. private universities in Syria
Authors: Mahmoud Ali Bassam , Grigoriou Nicholas 
Published: August 2017

AbstractThis study examines and compares word of mouth (WOM) behaviour among university students in Syria. To date, little is known about this important phenomenon which is surprising given the deregulated education market in Syria that allows for private universities to compete for students alongside public universities. Using a mixed methods research design and structural equation modelling, our results show faculty individualised attention and student satisfaction were found to be positively related to university image. Further, student satisfaction and university image were found to be direct sources of students’ positive WOM behaviour. We found a moderating effect of university ownership type on university image. Interestingly, we identified six themes showing how support staff empathy could be seen as a source of low student satisfaction. These were defined as deception/credibility/soft‐soapers/suspiciousness: when support staff coax something out of students; confusion/role conflict: resulting from the diverse roles played by support staff while interacting with students; unfairness: when a student notices discrimination in the level of empathy between their peers; privacy: when support staff empathy can be perceived as a kind of intrusion; self‐congratulatory: when a support staff member shows off or praises their empathy; and support staff/student ratio: when this ratio is seen to be small, the empathy effect reverses.
Randomized controlled trial on mouth rinse and flossing efficacy on interproximal gingivitis and dental plaque
Authors: Luís HS , Luís LS , Bernardo M , dos Santos NR 
Published: August 2017

AbstractObjectiveThe objective of this study was to compare the efficacy of an essential oils mouth rinse and dental floss on dental plaque accumulation and gingivitis in interproximal areas.MethodsWith informed consent, a parallel randomized controlled clinical trial was developed with 60 third‐year dental hygiene students, randomly divided into two non‐blind groups of 30 individuals each. For a period of 2 weeks, one group used an essential oils mouth rinse, according to manufacturer's instructions, and the other group flossed twice a day. Both groups received a toothbrush and fluoridated toothpaste for home dental hygiene care. A baseline dental hygiene appointment consisted of tooth scaling, prophylaxis and collection of the study data, using the Lobene modified gingival index; Saxton & Ouderaa gingival bleeding index and the Quigley & Hein modified by Turesky dental plaque index.ResultsAt baseline, there was no significant difference between the groups for interproximal gingival inflammation (P = .214), gingival bleeding (P = .829) and dental plaque accumulation (P = .860). After 2 weeks of treatment, no significant differences were found between the essential oils mouth rinse and dental flossing for reduction of interproximal gingival inflammation (P = .938) and bleeding (P = .307). Essential oils mouth rinse showed to be significantly better than dental flossing in reducing interproximal dental plaque accumulation (P = .006).ConclusionThe use of an essential oils mouth rinse may be advised, as a complement, for patients unable to floss effectively, as it is more effective in reducing interproximal dental plaque accumulation than dental floss.
Nurses' perceptions of health beliefs and impact on teaching and practice: a Q‐sort study
Authors: Cao R. , Stone T.E. , Petrini M.A. , Turale S. 
Published: August 2017

AimTo understand Chinese nurses’ perceptions of health beliefs, their content, origin and the influence of sociocultural factors, as a basis of their evidence‐based practice. This study contributes to a larger study to establish the health beliefs of Japanese, Australian, Chinese, South Korean and Thai nurses.BackgroundRegistered nurses teach patients and students about maintaining or attaining health are subject to the same range of influences and their health beliefs may be antithetical to current health evidence.MethodsQ‐method design using q‐sort and interview was used to explore the perspectives on a range of health beliefs of 60 nurses in four cities in China.FindingsThree factors arose from the perceptions of the participants about health and accounted for 50.2% of the total variance: (1) social impact, (2) ‘the importance of evidence’, and (3) beliefs rooted in culture.DiscussionInfluence on nurses’ health beliefs was explored in terms of the internalized and frequently unconscious beliefs, values and norms tying them to their communities, reflecting the need for nurses to be aware of their health beliefs and behaviours.ConclusionsEducation for nurses in practice needs to acknowledge that individual practitioners’ beliefs strongly influence health teaching for patients and families. In order to implement evidenced‐based practice and teach in line with current evidence nurses need to critically examine and reflect on the impact of culture, society and the media on their own health beliefs.Implications for nursing policy and health policyEducation policy needs to consider that culture and societal pressures affect nurses’ health beliefs and practice. Critical thinking, reflective and evidence‐based practice need to be emphasized in clinical training and nurse education. China also needs to develop policies to allow nurses to be able to assess the reliability of health information on the Internet and to make quality health research more available.
Exploring the association between genetic and environmental factors and molar incisor hypomineralization: evidence from a twin study
Authors: Teixeira Rafael José Pio Barbosa , Andrade Natália Silva , Queiroz Lisanca Carvalho Cavalcante , Mendes Fausto Medeiros , Moura Marcoeli Silva , Moura Lúcia de Fátima Almeida de Deus , Lima Marina Deus Moura 
Published: August 2017

BackgroundThe etiology of molar‐incisor hypomineralization (MIH) remains unknown. Studies indicate that it is multifactorial, and that genetic and environmental factors are involved. Research with twins provides important subsidy to investigate the Influence of genetics and environmental factors that act during pregnancy on the etiology of alterations.AimThis cross‐sectional study evaluated the agreement of molar incisor hypomineralization (MIH) between monozygotic and dizygotic twin pairs and the association with environmental factors.DesignThe sample consisted of 167 pairs of twins (8–15 years old), 94 monozygotic and 73 dizygotic. The parents answered a questionnaire on sociodemographic data and pre‐, peri‐, and postnatal health. A dental examination was performed by two calibrated examiners (Kappa ≥0.88) for MIH diagnosis, following the criteria proposed by the European Academy of Pediatric Dentistry in 2003.ResultsThe prevalence of MIH was 29.3%. There was greater concordance of MIH between monozygotic twins for affected first molars and permanent incisors (P = 0.0012) and pairs of twins assessed (P = 0.0211). The presence of MIH was associated with family income between one and two wages (P = 0.009, prevalence ratio [PR] = 3.82, confidence interval [CI 95%] 1.40–10.44), above two wages (P = 0.007, PR = 4.60, 95% CI: 1.51–14.05), and gestational hemorrhage (P = 0.032, PR = 5.70, 95% CI: 1.16–28.14).ConclusionsThe greater concordance in the diagnosis of MIH among monozygotic twins indicates a genetic influence, although environmental factors, such as family income and hemorrhage during pregnancy, are also associated with the occurrence of MIH.
Striking a new path in reducing cartilage breakdown: combination of antioxidative therapy and chondroanabolic stimulation after blunt cartilage trauma
Authors: Riegger Jana , Joos Helga , Palm Hans‐Georg , Friemert Benedikt , Reichel Heiko , Ignatius Anita , Brenner Rolf E. 
Published: August 2017

AbstractCartilage injury can trigger crucial pathomechanisms, including excessive cell death and expression of matrix‐destructive enzymes, which contribute to the progression of a post‐traumatic osteoarthritis (PTOA). With the intent to create a novel treatment strategy for alleviating trauma‐induced cartilage damage, we complemented a promising antioxidative approach based on cell and chondroprotective N‐acetyl cysteine (NAC) by chondroanabolic stimulation. Overall, three potential pro‐anabolic growth factors – IGF‐1, BMP7 and FGF18 – were tested comparatively with and without NAC in an ex vivo human cartilage trauma‐model. For that purpose, full‐thickness cartilage explants were subjected to a defined impact (0.59 J) and subsequently treated with the substances. Efficacy of the therapeutic approaches was evaluated by cell viability, as well as various catabolic and anabolic biomarkers, representing the present matrix turnover. Although monotherapy with NAC, FGF18 or BMP7 significantly prevented trauma‐induced cell dead and breakdown of type II collagen, combination of NAC and one of the growth factors did not yield significant benefit as compared to NAC alone. IGF‐1, which possessed only moderate cell protective and no chondroprotective qualities after cartilage trauma, even reduced NAC‐mediated cell and chondroprotection. Despite significant promotion of type II collagen expression by IGF‐1 and BMP7, addition of NAC completely suppressed this chondroanabolic effect. All in all, NAC and BMP7 emerged as best combination. As our findings indicate limited benefits of the simultaneous multidirectional therapy, a sequential application might circumvent adverse interferences, such as suppression of type II collagen biosynthesis, which was found to be reversed 7 days after NAC withdrawal.
Customer‐employee substitution: Evidence from gasoline stations
Authors: Basker Emek , Foster Lucia , Klimek Shawn 
Published: August 2017

AbstractWe document the adoption of self‐service pumps in U.S. gasoline stations from 1977 to 1992. Using establishment‐level data from the Census of Retail Trade over this period, we show that self‐service stations employ approximately one quarter fewer attendants per pump, all else equal. The work done by these attendants has shifted to customers, biasing upward conventional measures of productivity growth.
Significance of post‐peak metamorphic reaction microstructures in the ultrahigh temperature Eastern Ghats Province, India
Authors: Kelsey David E. , Morrissey Laura J. , Hand Martin , Clark Chris , Tamblyn Renee , Gaehl Adrian A. , Marshall Sarah 
Published: August 2017

AbstractUltrahigh temperature (UHT) granulites in the Eastern Ghats Province (EGP) have a complex P–T–t history. We review the P–T histories of UHT metamorphism in the EGP and use that as a framework for investigating the P–T–t history of Mg–Al‐rich granulites from Anakapalle, with the express purpose of trying to reconcile the down‐pressure‐dominated P–T path with other UHT localities in the EGP. Mafic granulite that is host to Mg–Al‐rich metasedimentary granulites at Anakapalle has a protolith age of c. 1,580 Ma. Mg–Al‐rich metasedimentary granulites within the mafic granulite at Anakapalle were metamorphosed at UHT conditions during tectonism at 960–875 Ma, meaning that the UHT metamorphism was not the result of contact metamorphism from emplacement of the host mafic rock. Reworking occurred during the Pan‐African (c. 600–500 Ma) event, and is interpreted to have produced hydrous assemblages that overprint the post‐peak high‐T retrograde assemblages. In contrast to rocks elsewhere in the EGP that developed post‐peak cordierite, the metasedimentary granulites at Anakapalle developed post‐peak, generation ‘2’ reaction products that are cordierite‐absent and nominally anhydrous. Therefore, rocks at Anakapalle offer the unique opportunity to quantify the pressure drop that occurred during so‐called M2 that affected the EGP. We argue that M2 is either a continuation of M1 and that the overall P–T path shape is a complex counter‐clockwise loop, or that M1 is an up‐temperature counter‐clockwise deviation superimposed on the M2 path. Therefore, rather than the rocks at Anakapalle having a metamorphic history that is apparently anomalous from the rest of the EGP, we interpret that other previously studied localities in the EGP record a different part of the same P–T path history as Anakapalle, but do not preserve a significant record of pressure decrease. This is due either to the inability of refractory rocks to extensively react to produce a rich mineralogical record of pressure decrease, or because the earlier high‐P part of the rocks history was erased by the M1 loop. Irrespective of the specific scenario, models for the tectonic evolution of the EGP must take the substantial pressure decrease during M2 into account, as it is probable the P–T record at Anakapalle is a reflection of tectonics affecting the entire province.
Analysis of liquid suspensions using scanning electron microscopy in transmission: estimation of the water film thickness using Monte–Carlo simulations
Authors: XIAO J. , FORAY G. , MASENELLI‐VARLOT K. 
Published: August 2017

SummaryEnvironmental scanning electron microscopy (ESEM) allows the observation of liquids under specific conditions of pressure and temperature. Moreover, when working in the transmission mode, that is in scanning transmission electron microscopy (STEM), nano‐objects can be analysed inside a liquid. The contrast in the images is mass‐thickness dependent as in STEM‐in‐TEM (transmission electron microscopy) using closed cells. However, in STEM‐in‐ESEM, as the liquid–vapour equilibrium is kept dynamically, the thickness of the water droplet remains unknown. In this paper, the contrasts measured in the experimental images are compared with calculations using Monte‐Carlo simulations in order to estimate the thickness of water. Two examples are given. On gold nanoparticles, the thickness of a thick film can be estimated thanks to a contrast inversion. On core‐shell latex particles, the grey level of the shell compared with those of the core and of the water film gives a relatively precise measurement of the water film thickness.
Black peel in facial dermatoses
Authors: Elghblawi Ebtisam 
Published: August 2017

SummaryBackgroundMelasma (facial dermatoses) is an acquired chronic disorder of hyperpigmentation over sun exposed parts and continues to be a therapeutic challenge due to the presence of melanin at varying depths in the epidermis and dermis, and many researchers are working hard to find a solution. The main culprit to remain is direct sun exposure, with other factors like drugs, genetic predisposition, thyroid abnormalities, pregnancy, phototoxic and photoallergic cosmetics. Melasma continues to have a remarkable impact on the well‐being of affected patients causing deep psychological and social anguish, and with the expansion of cosmetic dermatology globally, treatments that are successful against skin diseases and boost beauty without prolonged recovery periods, or exposing patients to the risks of surgery, are increasingly recognised and acknowledged. Many clinicians have used various peeling in facial acne, scarring, and hyperpigmentations, and there have been no well‐controlled studies comparing them with other conventional agents. Case presentation: a unique case of facial hyperpigmentation in a black female who presented seeking help which can be attributed to increased aesthetic awareness among people nowadays. A single session of black peel several passes was performed and the lady noted a lightening effect in the following weeks.ObjectiveThe aim of this paper is to improve, advance and expand our understanding and the knowledge beyond what is already known to wider colleagues, to impact society at large and to disseminate the findings to wider audiences. Also, the objective of the present paper is to examine the different effect of black peel in the treatment of facial dermatoses, and it gives realistic tips on performing black peeling safely and effectively in ethnic skin groups. This is meant to shed light on some ways for clinical handling and improving our understanding scientifically and educationally. It is the first original case report of interest in the existing literature for the best of my knowledge that had a positive impact for my female patient.MethodA single pass of black peel was applied on the lady's face.ResultsA pleasing brightening effect was examined and boosted the lady confidence.ConclusionThe patient had a positive pleasing experience that she had noticed from a single session application of the black peel.