bluuebunny/crossref_metadata_2025_split huggingface dataset:
Assessment of non-standard reaction conditions for asymmetric 1,3-dipolar organocatalytic cycloaddition of nitrone with α,β-unsaturated aldehydes
Authors: Mojzesová Melinda , Mečiarová Mária , Almássy Ambroz , Marti Roger , Šebesta Radovan 
Published: April 2015

AbstractNon-standard experimental conditions can often enhance organocatalytic reactions considerably. The current study explores the effectiveness of a range of non-standard reaction conditions for the asymmetric organocatalytic 1,3-dipolar cycloaddition of a nitrone with α,β-unsaturated aldehydes. The influence of ionic liquids, high-pressure conditions, ultrasound, microwave irradiation and ballmilling was tested as well as the flow process. Because of the low reactivity of the nitrone and unsaturated aldehydes in the 1,3-dipolar cycloaddition, cycloadducts were isolated in only moderate yields from the majority of experiments. However, high diastereo- and enantioselectivities were observed in ionic liquids under solvent-free conditions and in the flow reactor.
Synthesis of corn rootworm pheromones from commercial diols
Authors: Nguyen Thanh-Danh , Nguyen Cong-Hao , Im Chan , Dang Chi-Hien 
Published: April 2015

AbstractA mixture of stereoisomers of the corn rootworm pheromones was synthesised via the Grignard coupling of protected bromohydrins with alkylcuprate as a key step. The synthesis of 8-methyldec-2- yl propanoate (I ), the northern corn rootworm Diabrotica longicornis Say pheromone, was achieved from pentane-1,5-diol in four steps with an overall yield of 35.1 % and 10-methyltridecan-2-one (II ), the southern corn rootworm Diabrotica undecimpunctata howardi Barber pheromone, was synthesised from octane-1,8-diol as commercially available starting material in five steps with an overall yield of 28.7 %.
Analytical procedure for steroid profiling valid for Athlete Biological Passport
Authors: Jarek Anna , Kowalczyk Katarzyna , Chołbiński Piotr , Chajewska Katarzyna , Turek-Lepa Ewa , Pokrywka Andrzej , Bulska Ewa , Kwiatkowska Dorota 
Published: April 2015

AbstractAlthough various attempts have been made to eliminate doping in sport, hitherto they all have proved futile. Moreover, the main class of substances that jeopardises the fair play rule remains the same - anabolic androgenic steroids (AAS). To date, longitudinal monitoring of the fluctuations of the endogenous steroids content for a given athlete is regardeded as the most effective approach to the detection of AAS abuse. This is based on the fact that the activity of the steroid biosynthesis pathway may undergo significant changes in response to the AAS administration. This paper presents the entire analytical procedure for quantification of steroids crucial for the Athlete Biological Passport (ABP): testosterone, epitestosterone, dehydroepiandrosterone, androsterone, etiocholanolone, 5-α-androstandiol and 5-β-androstandiol. The procedure consists of a four-step sample preparation process followed by analysis by gas chromatography coupled with mass spectrometry. The limits of quantification for the substances listed above were; 0.44 ng mL
One-step preparation of porous copper nanowires electrode for highly sensitive and stable amperometric detection of glyphosate
Authors: Poorahong Sujittra , Thammakhet Chongdee , Thavarungkul Panote , Kanatharana Proespichaya 
Published: April 2015

AbstractA simple and sensitive amperometric method for the detection of glyphosate based on a porous copper nanowire electrode is presented. The porous nanowires were fabricated simply by a one-step electrodeposition using hydrogen bubbles generated during the deposition to produce pores. These porous nanowires provided a 1.4 times larger surface area than a porous copper film. After the fabrication process the porous copper nanowires can be applied directly as a working electrode with the same custom-built flow cell. The detection was carried out by measuring the oxidation signal of copper; this increased with the concentration of glyphosate due to dissolution of the copper from the electrode. Under optimal conditions, the responses of the sensor were linear between 0.010-5.0 μmol L
Gluconobacter sp. cells for manufacturing of effective electrochemical biosensors and biofuel cells
Authors: Bertokova Aniko , Bertok Tomas , Filip Jaroslav , Tkac Jan 
Published: April 2015

AbstractGluconobacter oxydans bacteria exhibit a unique metabolism for quick and incomplete oxidation of a wide range of different compounds (aldoses, ketoses, mono- and poly-alcohols, etc.). Such biotransformation efficiency with simple biomass production led to the industrial applications of these bacteria in the production of several important commodities. Their respiratory activity can also be successfully studied and used in the field of bioelectrochemistry. The main aim of this review is to present various strategies to improve selectivity of assays using intact/treated cells of G. oxydans, to introduce the application of G. oxydans-based biosensors in selective monitoring of analytes during biotransformation processes and to provide information about utilizable sugars in fermentation media or in biological oxygen demand value determination. The final part of the review describes potential application of G. oxydans cells in the generation of electricity from complex fuels within microbial fuel cells by advanced direct electron transfer route between bacterial cells and electrodes.
Aptamer-based detection of thrombin by acoustic method using DNA tetrahedrons as immobilisation platform
Authors: Poturnayová Alexandra , Šnejdárková Maja , Castillo Gabriela , Rybár Peter , Leitner Michael , Ebner Andreas , Hianik Tibor 
Published: April 2015

AbstractThe thickness shear mode acoustic method was used to study the binding of thrombin to DNA aptamers immobilised on the gold surface covered by DNA tetrahedrons. The binding of thrombin to conventional aptamers sensitive to fibrinogen (FBT) and heparin (HPT) exosites as well as to HPT in a loop configuration (HPTloop) made it possible to determine the constant of dissociation (K
Physicochemical aspects of Trichosporon cutaneum CCY 30-5-10 adhesion and biofilm formation potential on cellophane
Authors: Dostálková Jitka , Procházková Gita , Jirků Vladimír , Křiklavová Lucie , Lederer Tomáš , Suchánek Miloslav , Brányik Tomáš 
Published: April 2015

AbstractThis paper focuses on the adhesion and biofilm formation potential of cellulolytic yeast Trichosporon cutaneum CCY 30-5-10 on solid cellophane from a novel perspective. First, physicochemical characterisation of the cells and carrier (cellophane) was performed to evaluate the effect of different culture media (complex vs mineral) on yeast cell adhesion. (Un)favourable adhesion conditions were predicted using the thermodynamic approach. Next, the ability of the cells to colonise the carrier under the above conditions was quantified and the biofilm structure was characterised using image analysis. The approaches described were found suitable to predict and experimentally verify favourable (cell-solid) adhesion, i.e. the hydrophobic and low electron-donor nature of cellophane together with hydrophobic cells (obtained when cultivated in a complex culture medium) were found to have a major impact in defining successful yeast adhesion with subsequent biofilm formation.
Sensitive and selective determination of peptides, PG and PGP, using a novel fluorogenic reagent 4-chlorobenzene-1,2-diol
Authors: Yasmin Hasina , Rahman Mohammed Shafikur , Shibata Takayuki , Kabashima Tsutomu , Kai Masaaki 
Published: April 2015

AbstractA novel fluorometric method was developed for the sensitive and selective detection of Pro-Gly (PG) and Pro-Gly-Pro (PGP) using 4-chlorobenzene-1,2-diol (4-CBD) as a fluorogenic reagent. The reaction was performed at 37°C for 30 min in the presence of a borate buffer (pH 7.0) and sodium periodate. The resulting fluorescence intensity was measured using a spectrofluorometer with excitation and emission wavelengths of 450 nm and 535 nm. To obtain a stable fluorescent signal and maximise its intensity, different reaction conditions such as the concentrations of the reagents, the reaction time, and the pH were optimised. Under the optimised conditions, a linear relationship was obtained between fluorescence intensity and peptide concentrations from 1.0-40.0 μmol L
Heterocyclisation of substituted ylidenethiocarbonohydrazides using dimethyl acetylenedicarboxylate
Authors: Hassan Alaa A. , Abdel-Latif Fathy F. , Abdel Aziz Mohamed , Mostafa Sara M. , Bräse Stefan , Nieger Martin 
Published: April 2015

AbstractA facile and rapid procedure for the synthesis of dimethyl-2-[3-amino-5-(2-methoxy-2-oxoethylidene)- 4-oxothiazolidin-2-ylidenehydrazono]succinate, dimethyl {[2-alkylidenehydrazono)-5-(2-methoxy- 2-oxoethylidene)-4-oxothiazolidin-3-yl)amino]succinate and methyl (4-amino-5-oxo-3- thioxo-2,3,4,5-tetrahydro-1,2,4-triazine-6-yl)acetate affording yields of 61-54 %, 22-18 % and 14- 11 %, respectively, via a condensation reaction of dimethyl acetylenedicarboxylate (DMAD) with (substituted ylidene)thiocarbonohydrazides. One of the products was conclusively confirmed by single-crystal X-ray analysis. A mechanism for the formation of the products is presented.
Evaluation of oxidative stability of vegetable oils enriched with herb extracts by EPR spectroscopy
Authors: Kozłowska Mariola , Zawada Katarzyna 
Published: April 2015

AbstractVegetable oils are important constituents of a healthy diet. Still, unsaturated fatty acids present in vegetable oils are susceptible to oxidation, which leads to undesirable changes in sensory, chemical and nutritional properties of oils. To prevent this problem, antioxidants are applied with herbs and spices being one of the most important sources of natural antioxidants. Electron paramagnetic resonance spectroscopy (EPR) can be used to detect free radicals, which are the short-lived intermediates of lipid oxidation, and to monitor changes in oxidation susceptibility. In this study, the ESR spin trapping technique was used as a potential method for the evaluation of the resistance to free radical formation in rapeseed and sunflower oils enriched with herb extracts. The antioxidant effect of herb extracts on vegetable oils was also investigated by measuring their ability to scavenge DPPH free radical using EPR spectroscopy. The herb extracts generally improved the radical scavenging properties of sunflower and rapeseed oils but their influence on the onset of rapid lipid oxidation as measured by spin-trapping EPR depended on the type of oil and on the extract concentration.
Tropical mirror symmetry for elliptic curves
Authors: Böhm Janko , Bringmann Kathrin , Buchholz Arne , Markwig Hannah 
Published: April 2015

AbstractMirror symmetry relates Gromov–Witten invariants of an elliptic curve with certain integrals over Feynman graphs [10]. We prove a tropical generalization of mirror symmetry for elliptic curves, i.e., a statement relating certain labeled Gromov–Witten invariants of a tropical elliptic curve to more refined Feynman integrals. This result easily implies the tropical analogue of the mirror symmetry statement mentioned above and, using the necessary Correspondence Theorem, also the mirror symmetry statement itself. In this way, our tropical generalization leads to an alternative proof of mirror symmetry for elliptic curves. We believe that our approach via tropical mirror symmetry naturally carries the potential of being generalized to more adventurous situations of mirror symmetry. Moreover, our tropical approach has the advantage that all involved invariants are easy to compute. Furthermore, we can use the techniques for computing Feynman integrals to prove that they are quasimodular forms. Also, as a side product, we can give a combinatorial characterization of Feynman graphs for which the corresponding integrals are zero. More generally, the tropical mirror symmetry theorem gives a natural interpretation of the A-model side (i.e., the generating function of Gromov–Witten invariants) in terms of a sum over Feynman graphs. Hence our quasimodularity result becomes meaningful on the A-model side as well. Our theoretical results are complemented by a Singular package including several procedures that can be used to compute Hurwitz numbers of the elliptic curve as integrals over Feynman graphs.
Is Sustainable Development an Issue for Quality Management?
Authors: Jasiulewicz-Kaczmarek Małgorzata 
Published: April 2015

Abstract
In recent years, sustainable development strategy for enterprises has become an important issue around the globe. This requires the organization to review its current systems to improve the overall triple bottom-line performance (i.e. economic, environmental, and social). Rising to these challenges requires transforming management system towards sustainable management. Assuming quality management (QM) impact on organisations will continue, what types of QM-based improvement initiatives will develop in the future to meet the anticipated organizational and market changes?
Positive solutions of nth-order m-point impulsive boundary value problems
Authors: Karaca Ilkay Yaslan , Tokmak Fen Fatma 
Published: April 2015

Abstract
This paper is concerned with the existence of positive solutions of an nth-order m-point impulsive boundary value problem. Existence results of at least three positive solutions are established via a fixed point theorem in a cone due to Avery–Peterson. Also, an example is given to illustrate the effectiveness of our result.
Is there a correlation between body proportion and choice of profession?
Authors: Cingi Can Cemal , Muluk Nuray Bayar , Hanci Deniz , Güngör Elvin Onarıcı , Cingi Cemal 
Published: April 2015

Abstract

Objective: We made anthropometric measurements to compare body proportions of university students and to investigate the tendency of the students with more developed bodies in choosing profession for university education.

Methods: A total of 204 male students [group 1: students of School of Physical Education and Sports” (SPESp) (n=88), group 2: students of Faculty of Fine Arts (FFArts) (n=59), and group 3: students of Faculty of Medicine (FMed) (n=57)] were included, and anthropometric measurements were performed.

Results: “Height”; “chest circumference”; “difference of inspiration and expiration of chest circumference” values of the SPESp students were higher than the others (FFArts and FMed). In the SPESp students, chest circumference and chest expansion capacity by inspiration developed more. This shows the positive impact of sport on respiratory functions. Additionally, the legs are longer in students engaged in regular sports.

Conclusion: Exercise is important for all subjects in terms of body development, growth, and oxygenization and to decrease cardiovascular risk factors. For the development of the ideal body anthropometric rates, obesity prevention, and for the growth of healthy generations, governments should give importance to sports and take incentive measures to increase children and young people’s interest in the sport.
Structural Optimization of Box Wing Aircraft
Authors: Kalinowski Miłosz J. 
Published: April 2015

Abstract
The box wing system is an unconventional way to connect the lifting surfaces that the designers willingly to use in prototypes of new aircrafts. The article present a way to quickly optimize the wing structure of box wing airplane that can be useful during conceptual design. At the beginning, there is presented theory and methods used to code optimization program. Structure analysis is based on FEM beam model, which is sufficient in conceptual design. Optimization is performed using hybrid method, connection of simple iteration and gradient descent methods. Finally, the program is validated by case study.
Influence of restoration methods on the longevity of changes in the thermal and oxygen dynamics of a degraded lake
Authors: Grochowska Jolanta , Brzozowska Renata , Łopata Michał , Dunalska Julita 
Published: April 2015

Abstract
The study was conducted on Lake Długie, located in the city of Olsztyn, which for 20 years received raw domestic sewage (400 m3 per day). After preliminary conservation operations, the lake was restored by artificial circulation and phosphorus inactivation methods. During artificial circulation, water temperature in the whole lake volume was equalized. The disconnection of the compressor stimulated the return to typical thermal parameters in the lake. Phosphorus inactivation did not affect the thermal regime in the lake. Artificial circulation caused an increase in the oxygen content in the whole lake, lowered the oxygen-depletion rate during stagnation, and shortened the duration of anaerobic conditions in the near-bottom waters. Phosphorus inactivation did not directly affect the content of oxygen. However, after the coagulant was added to the lake, the oxygenation of the water was further improved owing to the depressed photosynthesis caused by drastically reduced availability of phosphate for primary producers.
Petroleum in coastal seawater of Gdańsk Bay
Authors: Stelmaszewski Adam 
Published: April 2015

Abstract
The paper presents petroleum concentration in coastal waters of Gdańsk Bay, which was measured in 2006 - 2012. The oil concentration ranges from below the detection limit, i.e. 1 μg kg-1 to almost 120 μg kg-1. The concentration does not usually exceed 60 μg kg-1 and its average value is 11.7 μg kg-1. The presence of petroleum in coastal water is characterized by seasonality, with the lowest values in summer and the highest in winter. The conducted research showed that the coastal zone is not the source of petroleum contamination of the sea. The main reason for the presence of petroleum in the coastal water is the migration of polluted water within the bay. The inflow of pollutants from the mainland is yet another source of the contamination in the sea.
Diverse feeding ecology and habitat use in coral reef fishes in the Malaysian South China Sea, as revealed by liver fatty acid composition
Authors: Arai Takaomi , Amalina Razikin , Bachok Zainudin 
Published: April 2015

Abstract
Fatty acid analysis was used to understand feeding ecology and habitat use of coral reef fishes in six families: Lutjanidae (Lutjanus lutjanus), Labridae (Thalassoma lunare), Nemipteridae (Scolopsis affinis, S. monogramma), Pomacentridae (Abudefduf bengalensis, A. sexfasciatus, A. viagiensis), Scaridae (Scarus quoyi, S. quoyi, S. rivulatus, S. ghobban) and Serrandae (Epinephelus fuscoguttatus, Cephalopholis cyanostigma, C. boenak) collected on the Bidong Island of the Malaysian South China Sea. The percentage of saturated fatty acids (ΣSAFA) ranged from 58.0% to 62.5%, with the highest values in fatty acids, the second highest percentage values were those of monounsaturated fatty acids (ΣMUFA) and they ranged from 25.7% to 38.9%, and the percentage of polyunsaturated fatty acids (ΣPUFA) had the lowest values, i.e. from 2.7% to 13.2%. ΣMUFA and ΣPUFA were significantly different between families, while ΣSAFA did not differ. These results indicate diverse feeding ecology and habitat use during the fish life history in relation to physiological condition, sexual development, and recent feeding events in the coral reef habitats in the Malaysian South China Sea.
Soft Biometrics for a Socially Assistive Robotic Platform
Authors: Carcagnì Pierluigi , Cazzato Dario , Del Coco Marco , Mazzeo Pier Luigi , Leo Marco , Distante Cosimo 
Published: April 2015

AbstractIn thiswork, a real-time system able to automatically recognize soft-biometric traits is introduced and used to improve the capability of a humanoid robot to interact with humans. In particular the proposed system is able to estimate gender and age of humans in images acquired from the embedded camera of the robot. This knowledge allows the robot to properly react with customized behaviors related to the gender/age of the interacting individuals. The system is able to handle multiple persons in the same acquired image, recognizing the age and gender of each person in the robot’s field of view. These features make the robot particularly suitable to be used in socially assistive applications.
A comparative structural analysis of sepiapterin reductase from Drosophila by homology modeling
Authors: Kim Kiyoung , Song Keon-Hyoung , Yim Jeongbin 
Published: April 2015

Abstract
Sepiapterin reductase (SR) catalyzes the final steps of BH4 biosynthesis. Previously, a gene encoding SR has been cloned and characterized from a Drosophila cDNA library in vitro. The present study reports the identification of another SR gene in the Drosophila genome and the structural characteristics and differences of the two Drosophila SRs, using homology modeling analysis. Homology modeling of SRs for protein structure and function prediction showed that the two SRs have different surface electrostatic distributions and different shapes of the substrate (sepiapterin)-binding sites. These results provide valuable insight into the possibility of diverse functions of Drosophila SRs in vivo.
Aufsätze / Essays: Apollinaris of Laodicea in the Catenae as a Source of Hexaplaric Readings
Authors: Ceulemans Reinhart 
Published: April 2015

ZUSAMMENFASSUNGDer vorliegende Artikel sucht zu beweisen, dass die Fragmente der verlorengegangenen Kommentare des Apollinaris von Laodizea (ca. 315-391), die in den Katenen erhalten sind, eine Quelle für die hexaplarischen (dass heisst Aquila-, Symmachus- und Theodotion-) Lesarten sind, die reicher ist, als es der Apparat der modernen hexaplarischen Editionen vermuten lässt. Die Analyse einiger Katenen-Fragmente der Kommentare des Apollinaris zu Genesis, den Psalmen und dem Römerbrief, in denen er verschiedene Aquila- und Symmachus-Lesarten geboten hat, macht deutlich, warum sein Zeugnis nicht in der Edition von Field und in der Göttinger Reihe vermerkt wird. Die folgenden Ursachen lassen sich aufzeigen: (1) auf Grund (stillschweigender) editorischer Prinzipen hat man sich dafür entschieden, andere Zeugen als Apollinaris zu nennen; (2) in Ermangelung kritischer Editionen der Katenen wurde Apollinaris nicht immer als die Quelle der hexaplarischen Lesarten erkannt; (3) manche Lesarten sind schlichtweg nicht bemerkt worden, da die Katenen, in denen sie zu fi nden sind, nicht herangezogen wurden. Die Erkenntnis, dass Apollinaris ein wertvoller Zeuge der hexaplarischen Lesarten ist, macht ihn zu einem wichtigen Studienobjekt für das Nachleben der Hexapla in der antiochenischen Schule.
A Dynamic Mobile DNA Family in the Yeast Mitochondrial Genome
Authors: Wu Baojun , Hao Weilong 
Published: April 2015

Abstract
Transposable elements (TEs) are an important factor shaping eukaryotic genomes. Although a significant body of research has been conducted on the abundance of TEs in nuclear genomes, TEs in mitochondrial genomes remain elusive. In this study, we successfully assembled 28 complete yeast mitochondrial genomes and took advantage of the power of population genomics to determine mobile DNAs and their propensity. We have observed compelling evidence of GC clusters propagating within the mitochondrial genome and being horizontally transferred between species. These mitochondrial TEs experience rapid diversification by nucleotide substitution and, more importantly, undergo dynamic merger and shuffling to form new TEs. Given the hyper mobile and transformable nature of mitochondrial TEs, our findings open the door to a deeper understanding of eukaryotic mitochondrial genome evolution and the origin of nonautonomous TEs.