bluuebunny/crossref_metadata_2025_split huggingface dataset:
Lerngelegenheiten mit kaufmännischem Kontext im Mathematikunterricht der allgemeinbildenden Schule – Eine Schulbuch- und Aufgabenanalyse
Authors: von Hering Robert , Zingelmann Halima , Heinze Aiso , Lindmeier Anke 
Published: January 2020

ZusammenfassungDer Erwerb mathematischer Kompetenz im allgemeinbildenden Unterricht soll unter anderem der Berufsvorbereitung dienen. Für das Fach Mathematik sind kaufmännische Ausbildungsberufe mit ihren hohen Ausbildungszahlen und mathematischen Anforderungen eine wichtige Referenz. Werden in der Schule berufsfeldbezogene mathematische Kompetenzen erworben, so können diese theoretisch Passungsprobleme am Übergang Schule – Beruf abmildern. Es stellt sich daher die Frage, inwiefern im allgemeinbildenden Mathematikunterricht vorbereitende Lerngelegenheiten für den kaufmännischen Bereich (exemplarisch für Industriekaufleute) vorkommen. In der Studie wurden als Annährung an den Unterricht Schulbücher der Sekundarstufe im Hinblick auf Aufgaben mit (industrie-)kaufmännischem Kontext untersucht. Die Klassifikation der Kontexte von 18 allgemeinbildenden Mathematikschulbüchern aus 4 Reihen zeigt, dass zwar 6 % der Aufgaben ein Potential zur Vorbereitung auf kaufmännische Anforderungen enthalten, die Aufgaben weisen aber größtenteils einen niedrigen Grad an Berufsbezogenheit auf. Die Studie kann zum besseren Verständnis der derzeitigen Ausgestaltung von Berufsvorbereitung im allgemeinbilden Mathematikunterricht beitragen.
Geoheritage of Postglacial Areas in Northern Poland—Prospects for Geotourism
Authors: Jamorska Izabela , Sobiech Marcin , Karasiewicz Tomasz , Tylmann Karol 
Published: January 2020

AbstractThis study aims to identify potential geosites and show existing geosites in a young glacial landscape in northern Poland through a qualitative assessment of the local geoheritage. Three areas of diversified morphology and geology located within the extent of the last Scandinavian Ice Sheet have been selected as the research polygons: the north-eastern part of the Dobrzyń Lake District, the Lower Vistula Valley and the Kashubian Lake District. Three basic abiotic components of the environment have been analysed: geology, terrain relief and hydrology. This research is based on some specific materials including maps and photographs. Methodology of this research includes the inventory, characterization and assessment of selected areas. The final results are proposals for geosites of high educational value in each of the three investigated regions. For the north-eastern part of the Dobrzyń Lake District, the creation of a geopark has been proposed, and the geosites of the Lower Vistula Valley provide the potential for a geotourist footpath to be designed. The Kashubian Lake District is characterised by the occurrence of numerous glacial landforms and sediments as well as high denivelations and a concentration of erratic boulders. Therefore, this region also has the potential to be selected for valuable geosites and the designing of a geotourist footpath.
Simultaneous removal of COD and Ammoniacal Nitrogen from dye intermediate manufacturing Industrial Wastewater using Fenton oxidation method
Authors: Pani Nibedita , Tejani Vishnu , Anantha-Singh T. S. , Kandya Anurag 
Published: January 2020

AbstractThe untreated wastewater from the dye industry having high ammoniacal nitrogen and chemical oxygen demand (COD) significantly pollutes the receiving water, such as a river, having major ill implications on the aquatic environment. The present study is undertaken to address this problem. It investigates the effectiveness of Fenton reagent in simultaneous treatment (removal) of ammoniacal nitrogen and COD present in the wastewater by varying the parameters like pH, concentration of Fe 2+ and H2O2 and their molar ratio. The reaction time for all the experiments was kept 60 min. The experimental analysis in terms of calculating the residual % of ammoniacal nitrogen and COD revealed that the maximum reduction occurred at pH 3. At this pH, further set of experiments were performed by varying the molar doses of Fe2+/H2O2 as 1:1, 3:3 and 5:5, and the results reveal that the maximum reduction in both ammoniacal nitrogen and COD happens at molar dose of 3:3. To understand the effect of the concentration of Fe2+ and H2O2 on the respective removal efficiency, set of experiments were performed by taking the molar ratio of Fe2+/H2O2 as 2:1, 3:1, 5:1, 1:2, 1:3 and 1:5. The experimental analysis reveals that the maximum reduction happened at molar ratio 1:3. Fenton process can mineralize the pollutants up to 75.8% and 78.6% for ammoniacal nitrogen and COD removal. The findings of the study would be of great use for planning and optimizing the wastewater treatment facility for the dye intermediate industry.
Knowledge gaps and management recommendations for future paths of sustainable seaweed farming in the Western Indian Ocean
Authors: Eggertsen Maria , Halling Christina 
Published: January 2020

AbstractFarming of eucheumatoid seaweeds is a widespread, promising activity and an important livelihood option in many tropical coastal areas as for example in East Africa, Western Indian Ocean (WIO). Compared to other types of aquaculture, seaweed farming has generally low impact on the environment. Nonetheless, there are potential direct or indirect negative effects of seaweed farming, such as introduction of alien species and changes in local environmental conditions. Although farming has been practiced in this region during several decades, the knowledge concerning the actual environmental impacts from faming non-native eucheumatoid haplotypes and consequently how to manage farming activities to mitigate those is highly limited. In this review, we provide a summary of the current scientific knowledge of potential direct and indirect negative environmental effects linked to eucheumatoid seaweed farming such as alterations of benthic macrophyte habitats and loss of native biodiversity. Furthermore, we highlight knowledge gaps that are of importance to address in the near future, e.g., large-scale ecosystem effects and farms as potential vectors of pathogens. We also provide a number of feasible management recommendations to be implemented for a continued development of environmentally sustainable seaweed farming practices in the WIO region, which includes spatial planning of farms to avoid sensitive areas and farming of native haplotypes of eucheumatoids instead of introduced specimens.
Labor Force Participation Over the Life Course: The Long-Term Effects of Employment Trajectories on Wages and the Gendered Payoff to Employment
Authors: Weisshaar Katherine , Cabello-Hutt Tania 
Published: January 2020

AbstractIn this article, we consider how individuals’ long-term employment trajectories relate to wage inequality and the gender wage gap in the United States. Using more than 30 years of data from the National Longitudinal Survey of Youth 1979 sample, we identify six employment trajectories for individuals from ages 22 to 50. We find that women across racial/ethnic groups and Black men are more likely than White and Hispanic men to have nonsteady employment trajectories and lower levels of employment throughout their lives, and individuals who have experienced poverty also have heightened risks of intermittent employment. We then assess how trajectories are associated with wages later in careers, at ages 45–50. We find significant variation in wages across work trajectories, with steady high employment leading to the highest wages. This wage variation is primarily explained by work characteristics rather than family characteristics. Finally, we examine gender variation in within-trajectory wages. We find that the gender wage gap is largest in the steady high employment trajectory and is reduced among trajectories with longer durations of nonemployment. Thus, although women are relatively more concentrated in nonsteady trajectories than are men, men who do follow nonsteady wage trajectories incur smaller wage premiums than men in steady high employment pathways, on average. These findings demonstrate that long-term employment paths are important predictors of economic and gender wage inequality.
Preparation and characterization of Chicory leaf powder and its application as a nano-native plant sorbent for removal of Acid Blue 25 from aqueous media: isotherm, kinetic and thermodynamic study of the adsorption phenomenon
Authors: Haghighizadeh Maryam , Zare Karim , Aghaie Hossein , Monajjemi Majid 
Published: January 2020

AbstractIn this study, the Chicory leaf powder (CLP) was used as a native adsorbent to eliminate the Acid Blue 25 dye from aqueous media. The prepared native adsorbent was characterized by several techniques including the X-ray powder diffraction (XRD), scanning electron microscopy (SEM), Fourier-transform spectroscopy (FTIR), Brunauer–Emmet–Teller essay (BET), and particle size analyzer (PSA). A collection of experiments was performed to distinguish the optimal conditions and to probe the effects of the different parameters such as initial concentration, contact time, adsorbent dosage, pH of solution, and temperature on the sorbent capacity. The attained optimal conditions for removal the Acid Blue 25 dye were pH = 3–4, contact time 50 min, dosage 0.1 g, and initial concentrations 10 (mg/L) at 30 °C. The adsorption data revealed that the adsorption procedure has more match with the Langmuir isotherm than others. The kinetic data were better fitted with the pseudo-second-order pattern with a trusty correlation coefficient. Finally, the thermodynamic parameters illustrated that the adsorption process is exothermal and spontaneous. Based on magnitude of the standard enthalpy change related to the studied adsorption, we may derive that the considered adsorption is physical adsorption.
Antimicrobial effect of chitosan–silver–copper nanocomposite on Candida albicans
Authors: Ashrafi Mohsen , Bayat Mansour , Mortazavi Pejman , Hashemi Seyed Jamal , Meimandipour Amir 
Published: January 2020

Abstract
Candida is a common yeast in opportunistic fungal diseases around the world and is usually colonized on the skin and mucosal membranes. The purpose of this study was to synthesize chitosan–silver–copper nanocomposite and to investigate its antifungal effects on Candida albicans. Silver, copper and chitosan nanoparticles were synthesized individually. Then, copper–silver–chitosan nanocomposite was synthesized. These nanoparticles are approved by transmission electron microscope, and nanocomposite structure was also confirmed by scanning electron microscope. Then, the minimum inhibitory concentrations and minimum fungicidal of these nanostructures were examined on C. albicans. The results of this study indicate that the properties and effects of the investigated nanocomposite are comparable to amphotericin B as standard material. The results show that this effect was higher for copper–silver–chitosan nanocomposite than for other nanoparticles studied. Antifungal effect of copper nanoparticles and chitosan nanoparticles was not established separately, but it was found that their composition had antifungal effects that were effective. The combination of nanoparticles of chitosan with silver has been shown to have some antifungal effects. The most antifungal effect for the nanoparticles studied is related to copper–silver–chitosan nanocomposite and, which has had a significant effect on the growth of C. albicans in the laboratory environment compared to other nanoparticles.

Graphic abstract
A dynamic evaluation technique for assessing gas output from coal seams during commingling production within a coalbed methane well: a case study from the Qinshui Basin
Authors: Wu Chuan , Yuan Chengxiang , Wen Guojun , Han Lei , Liu Haojie 
Published: January 2020

AbstractGas drainage is carried out based on output from each coal bed throughout commingling production of coalbed methane (CBM). A reasonable drainage process should therefore initially guarantee main coal bed production and then enhance gas output from other beds. Permanent damage can result if this is not the case, especially with regard to fracture development in the main gas-producing coal bed and can greatly reduce single well output. Current theoretical models and measuring devices are inapplicable to commingled CBM drainage, however, and so large errors in predictive models cannot always be avoided. The most effective currently available method involves directly measuring gas output from each coal bed as well as determining the dominant gas-producing unit. A dynamic evaluation technique for gas output from each coal bed during commingling CBM production is therefore proposed in this study. This technique comprises a downhole measurement system combined with a theoretical calculation model. Gas output parameters (i.e., gas-phase flow rate, temperature, pressure) are measured in this approach via a downhole measurement system; substituting these parameters into a deduced theoretical calculation model then means that gas output from each seam can be calculated to determine the main gas-producing unit. Trends in gas output from a single well or each seam can therefore be predicted. The laboratory and field test results presented here demonstrate that calculation errors in CBM outputs can be controlled within a margin of 15% and therefore conform with field use requirements.
Increasing the proportion of plasma MUFA, as a result of dietary intervention, is associated with a modest improvement in insulin sensitivity
Authors: Johns I. , Frost G. , Dornhorst A. 
Published: January 2020

Abstract
The effect of modifying dietary fatty acid (FA) composition on insulin sensitivity remains unclear. We aimed to investigate whether changes in plasma phospholipid (PL) FA composition, as a result of dietary intervention, correspond with changes in insulin sensitivity. The RISCK study was a 6-month randomised controlled dietary intervention study, which assessed the effect of modifying dietary fat and the glycaemic index (GI) of carbohydrates on insulin sensitivity. Total NEFA levels, fasting plasma PL FA profiles and an insulin sensitivity index (Si), derived from intravenous glucose tolerance minimal-model analysis, were available from 533 participants, all at elevated risk of type 2 diabetes. Bivariate correlations between changes in saturated PL FA (SFA), MUFA (as a percentage of total plasma NEFA) and changes in Si were assessed according to treatment group. Age, sex, ethnicity, percentage change in body mass and change in dietary GI were controlled for. Increasing total NEFA concentration was associated with worsening Si (r −0·152; P = 0·001). In the high-MUFA/low-GI diet group, change in PL-MUFA was positively and independently associated with change in Si (r 0·297; P = 0·002). Among MUFA, change in oleic acid (18 : 1) was most strongly correlated with change in Si (r 0·266; P = 0·005), as was change in minor FA 24 : 1 (r 0·244; P = 0·011) and 17 : 1 (r 0·196; P = 0·042). In the high-SFA/high-GI group, change in SFA concentration was not significantly associated with change in Si. In conclusion, increases in the proportion of plasma PL-MUFA following a high-MUFA dietary intervention were associated with improvements in insulin sensitivity.
Prenatal restraint stress impairs recognition memory in adult male and female offspring
Authors: Moura Clarissa A. , Oliveira Matheus C. , Costa Layse F. , Tiago Pamella R. F. , Holanda Victor A. D. , Lima Ramon H. , Cagni Fernanda C. , Lobão-Soares Bruno , Bolaños-Jiménez Franscico , Gavioli Elaine C. 
Published: January 2020

AbstractObjective:Accumulating evidence from preclinical and clinical studies indicates that prenatal exposure to stress impairs the development of the offspring brain and facilitates the emergence of mental illness. This study aims to describe the impact of prenatal restraint stress on cognition and exploration to an unfamiliar environment at adulthood in an outbred strain of mice.Methods:Late pregnant mice were exposed to restraint stress and adult offspring (60 days of age) behaviours were assessed in the object recognition task and open field test.Findings:Prenatal stress (PNS) impaired new object recognition in male and female mice. Importantly, the learning deficits in female PNS mice were linked to their estrous cycle. Actually, PNS females in metestrus/diestrus but not in proestrus/estrus phases displayed recognition deficits compared to controls. Concerning locomotion in an unfamiliar environment, male but not female PNS mice displayed significant increase, but showed no differences in the distance travelled within the centre zone of the arena.Conclusion:Present findings support the view that maternal restraint-stress during late pregnancy impairs recognition memory in both male and female offspring, and in females, this cognitive deficit is dependent on the estrous cycle phase. Ultimately, these data reinforce that PNS is an aetiological component of psychiatric disorders associated with memory deficits.
Glucose absorption from peritoneal dialysate is associated with a gain in fat mass and a reduction in lean body mass in prevalent peritoneal dialysis patients
Authors: Law Steven , Davenport Andrew 
Published: January 2020

AbstractThe majority of peritoneal dialysates use glucose to generate an osmotic gradient for the convective removal of water and Na. Although glucose can potentially be absorbed, previous studies have failed to establish whether this leads to increased fat weight gain. We measured body composition using bioimpedance in peritoneal dialysis (PD) patients, electively starting PD, attending for their first assessment of peritoneal membrane function after 2–3 months, and then after 12 months. We studied 143 patients: eighty-nine (62·2 %) males, fifty-three (37·1 %) diabetics, mean age 61·3 (SD14·9) years, with ninety (62·1 %) patients treated by automated PD cyclers with a daytime icodextrin exchange and thirty-seven (25·9 %) by continuous ambulatory PD. Median fat mass increased by 1·8 (–0·5 to 4·1) kg, whereas fat-free mass fell –1·3 (–2·9 to 1·0) kg, and the increase in fat mass was negatively associated with the fall in soft lean mass (r–0·41,P< 0·001). Increased fat mass was associated with measured peritoneal glucose absorption (r0·69,P< 0·001), and glucose absorption was associated with the amount of 22·7 g/l glucose dialysate (OR 2·0, 95 % CI 1·5, 2·5,P< 0·001), peritoneal urea clearance (OR 9·5, 95 % CI 2·4, 37·1,P= 0·001) and male sex (OR 4·8, 95 % CI 1·5, 14·9,P= 0·008). We report an observational study in prevalent PD patients following body composition from their first assessment of PD membrane function for approximately 12 months, and despite the majority of patients prescribed icodextrin, we have demonstrated not only an association between intra-peritoneal glucose absorption and fat weight gain but also loss of fat-free mass.
Flaxseed oil in the context of a weight loss programme ameliorates fatty liver grade in patients with non-alcoholic fatty liver disease: a randomised double-blind controlled trial
Authors: Rezaei Shahla , Sasani Mohammad Reza , Akhlaghi Masoumeh , Kohanmoo Ali 
Published: January 2020

AbstractLong-chain n-3 fatty acids have been shown to regulate lipid metabolism and reduce fat accumulation in the liver. This trial investigated the effect of flaxseed oil, as a rich source of α-linolenic acid, on fatty liver and cardiometabolic risk factors in patients with non-alcoholic fatty liver disease (NAFLD). The randomised, double-blind, controlled trial was performed on sixty-eight NAFLD patients who were divided into flaxseed (n 34) and sunflower (n 34) oil groups. Patients were given a hypoenergetic diet (−2092 kJ/d) and 20 g/d of the corresponding oil for 12 weeks. Fatty liver grade, liver enzymes and cardiometabolic parameters were determined. The intention-to-treat approach was used for data analysis. Fatty liver grade significantly decreased in both groups (−0·68 in flaxseed v. −0·29 in sunflower, P = 0·002). Alanine aminotransferase and aspartate aminotransferase decreased in both groups (P < 0·01). Also, significant reduction was observed in blood glucose (P = 0·005) and fat mass (P = 0·01) in the flaxseed and muscle mass (P = 0·01) in the sunflower group. However, none of these alterations was significantly different between the groups. Weight, waist circumference and blood pressure were significantly decreased in both groups but only weight change was significantly different between the groups (P = 0·01). IL-6 did not significantly change in either group but showed a significant between-group difference (P = 0·03). Overall, the results showed that in the context of a low-energy diet and moderate physical activity, flaxseed oil may benefit NAFLD patients to improve fatty liver grade, weight and IL-6 compared with sunflower oil.
Dirofilaria immitis possesses molecules with anticoagulant properties in its excretory/secretory antigens
Authors: Diosdado Alicia , Simón Fernando , Morchón Rodrigo , González-Miguel Javier 
Published: January 2020

AbstractDirofilaria immitis is a parasitic nematode that survives in the circulatory system of suitable hosts for many years, causing the most severe thromboembolisms when simultaneous death of adult worms occurs. The two main mechanisms responsible for thrombus formation in mammals are the activation and aggregation of platelets and the generation of fibrin through the coagulation cascade. The aim of this work was to study the anticoagulant potential of excretory/secretory antigens from D. immitis adult worms (DiES) on the coagulation cascade of the host. Anticoagulant and inhibition assays respectively showed that DiES partially alter the coagulation cascade of the host and reduce the activity of the coagulation factor Xa, a key enzyme in the coagulation process. In addition, a D. immitis protein was identified by its similarity to the homologous serpin 6 from Brugia malayi as a possible candidate to form an inhibitory complex with FXa by sodium dodecyl sulfate polyacrylamide gel electrophoresis and mass spectrometry. These results indicate that D. immitis could use the anticoagulant properties of its excretory/secretory antigens to control the formation of blood clots in its immediate intravascular habitat as a survival mechanism.
Determinants of external and blood parasite load in African penguins (Spheniscus demersus) admitted for rehabilitation
Authors: Snyman Albert , Vanstreels Ralph Eric Thijl , Nell Chandré , Schaefer Adam M. , Stracke Thomas , Parsons Nola J. , Ludynia Katrin , Pistorius Pierre A. 
Published: January 2020

AbstractWe investigate the factors associated with the occurrence and abundance of external and blood parasites in African penguins (Spheniscus demersus), an endangered seabird that breeds exclusively on the coasts of Namibia and South Africa. External parasites were collected using the dust-ruffling method from 171 African Penguins admitted at a rehabilitation facility in the Western Cape, South Africa. Additionally, blood smears were obtained upon admission and weekly during rehabilitation and examined for blood parasites. Fleas Parapsyllus longicornis humboldti, ticks Ornithodoros capensis and lice Austrogoniodes demersus were recovered from 93, 63 and 40%, respectively, of the penguins upon admission to the centre. Rescue location and age group were identified as significant determinants of flea abundance, whereas month of admission was a significant determinant of tick abundance. Blood parasites were also common on admission, with Babesia being the most frequent (46% prevalence) whereas Borrelia was recorded sporadically (1.2%) and Plasmodium was recorded once. The prevalence and abundance of ticks on admission was positively associated with Babesia infection on admission. Our findings demonstrate the variability and contributing factor of parasite infections in an endangered species of penguin, and highlight the need for additional research on the parasite–host dynamics involving these potential disease vectors.