bluuebunny/crossref_metadata_2025_split huggingface dataset:
Nesidioblastosis en una escolar, a propósito de un caso
Authors: Almánzar Rosario , Rosario Adonise , Díaz Zaymi , Figueroa Jiomar , Segura Massiel 
Published: March 2019

Introducción: La nesdioblastosis se define como proliferación de las células endocrinas pancreáticas, que comporta alteraciones en su distribución y diferenciación. El número de los islotes de Langerhans es menor de lo normal, encontrándose las células endocrinas distribuidas, anárquicamente, por el parénquima pancreático, en forma de pequeños nidos o cordones1.
Objetivo: Describir un caso clínico de nesidioblastosis en una paciente en edad escolar, con historia de convulsiones tonicoclónicas desde 1 año de edad, tratado con Oxcarbazepina. Presentando hipoglucemias sintomáticas desde 1 año y medio, por lo que fue referida a la consulta de endocrinología.
Presentación del caso clínico: Paciente femenina de 7 años y 5 meses de edad cronológica, referida al departamento de endocrinología con historia de enfermedad actual, caracterizada diaforesis y mareos; presenta movimientos tónico-clónicos generalizados, retroversión ocular con pérdida del estado de conciencia (en 2 oportunidades), es trasladada a centro médico donde evidencian glucemia en 18-11-32-16 mg/dl respectivamente, colocan solución dextrosa con mejoría momentánea. Permanece por 9 días sin recuperación completa y aparecen fiebre de 3 días de evolución; Es trasladada al Hospital Infantil Robert Reid Cabral (RRC), donde se estudia y se confirman las hipoglucemias, analíticas que revelan hormonas contrarreguladoras elevadas, niveles de insulina en 2,700 mui/ml. Se estabiliza con octreotide y se decide llevar a cirugía para pancreactectomia, realizándose laparotomía abierta. Biopsia trans-operatoria reportó: hiperplasia de las células de los islotes de Langerhans. Por lo que se extirpa un 95% de tejido pancreático, presenta hiperglicemias y se inicia tratamiento con análogos de insulina de acción lenta (0.14 ud/kg/d), enzimas pancreáticas 10,000ud, 15 min previo a comidas y multivitamínicos.
Al mes de la cirugía la paciente vuelve a presentar signos de hipoglicemias, se suspende la insulina y se ingresa, se verifican las hipoglicemias y se realiza una segunda intervención quirúrgica. También se realiza excéresis de 5% de páncrea; segundada porción del duodeno, con anastomosis terminal. Actualmente responde al tx con insulina análoga.
Conclusión: La nesidioblastosis en una causa rara de hipoglucemia por hiperinsulinismo endógeno en el escolar, clínicamente es indistinguible del insulinoma; bioquímicamente es necesario documentar la hipoglucemia hiperinsulinémica durante el ayuno, el tratamiento de elección es la cirugía y seguimiento médico a los déficits secundarios a la misma.
In vitro arrow cane (Gynerium sagitatum Aubl.) multiplication in double phase medium
Authors: Lopez D. Claudia Marcela , Suarez P. Isidro Elias 
Published: March 2019

Arrow cane (Gynerium sagitatum Aubl.) is a Poaceae species used as fiber source to make traditional and valuable handmade craftsmanship by indigenous communities in Northern Colombia. Since no commercial crops are established fiber needs are taken from natural plant populations affecting ecosystem. A micropropagation protocol to clonally multiply large quantities of arrow cane plant material for planting commercial crops has been developed; however, micropropagated plants are costly compared to naturally extracted plant material. To reduce micropropagated plants costs, in the present research a double phase medium formulation along with continuous shoot culture with no periodic transfers to fresh medium was compared to semisolid medium system with subculture every four weeks with respect to multiplication rate and costs of micropropagated plants. The results showed that continuous culture of explants with double phase medium and no periodic transfers resulted in higher multiplication rates and larger shoots compared to shoots cultured using the conventionalsemisolid medium system and transfer to fresh medium every four weeks. Plants from both, semisolid and double phase culture system, fully adapted and recovered when transferred to ex vitro conditions. The cost analysis showed that double phase cultured shoots are ≥20% less expensive.
Evaluación de materiales de encalado mediante pruebas de incubación en un oxisol de la altillanura colombiana
Authors: Castro Hugo , Guerrero Juan Carlos 
Published: March 2019

Los Oxisoles comprenden una de las fronteras agrícolas más extensas del mundo; en América del Sur existen 243 millones de hectáreas, 17 corresponden a Colombia. La acidez debida al aluminio, la desbasificación y la baja disponibilidad de fósforo, constituyen los indicadores de infertilidad química más relevantes en estos suelos. El objetivo del presente trabajo, fue evaluar el efecto de materiales de encalado sobre la acidez y el mejoramiento químico de bases en un oxisol típico de sabana nativa, ubicado en la Altillanura Colombiana. Mediante un diseño experimental completamente aleatorio se definieron 13 tratamientos de incubación con tres replicaciones. Se tuvo en cuenta la caracterización química del suelo problema, al cual se incorporó 1.5t.ha-1CaCO3 equivalente utilizando diferentes materiales de encalado comerciales de EQCaCO3 conocido. A los 40 días post-incubación se evaluaron variables químicas relacionadas con la problemática de acidez (pH y concentraciones de Ca2+, Mg2+ y P). Se comprobó que los materiales encalantes usados como enmiendas simples (dolomitas calcinadas, dolomitas molidas, hidróxidos de calcio y magnesio, escorias básicas y cales vivas) presentarón efecto significativo sobre el control de la acidez y sobre el incremento en la concentración de Ca2+ y Mg2+ coloidal. Similar respuesta se obtuvo cuando los tratamientos relacionados como enmiendas simples, se mezclaron con roca fosfórica y materia orgánica (gallinaza) en relación porcentual 75:10:15respectivamente. Los hidróxidos de calcio y magnesio y las escorias básicas de siderúrgica usadas como enmiendas simples o formando parte de enmiendas complejas, ofrecieron efectos superiores en el control de acidez con respecto al resto de materiales.
Short Selling and Firms' Disclosure of Bad News: Evidence from Regulation SHO
Authors: Clinch Gregory J. , Li Wei , Zhang Yunyan 
Published: March 2019

ABSTRACT
As informed traders, short sellers enhance the informativeness of stock prices, especially related to bad news, potentially reducing the benefits and increasing litigation and reputational costs of withholding bad news by managers. We exploit a quasi-natural experimental setting provided by the introduction of SEC regulation SHO (Reg-SHO), which significantly reduced the constraints faced by short sellers for an effectively randomly selected subsample of U.S. firms (pilot firms). Relative to control firms, we find pilot firms increase the likelihood of voluntary bad news management forecasts, provide these forecasts in a more timely manner, and accelerate the release of quarterly bad earnings news. Each of these effects is stronger for subsamples of moderate (compared with extreme) bad news, firms facing high (relative to low) litigation risks, and firms with a forecasting history. Similar effects are not observed for voluntary good news forecasts. A range of robustness tests reinforce our results.
JEL Classifications: G14; D22; K22; K41; M40.
The Reproductive Success of Farmed American Mink (Neovison Vison) – A Review
Authors: Ludwiczak Agnieszka , Stanisz Marek 
Published: March 2019

Abstract
The aim of this review was to define the most important factors that affect the reproductive success of farmed mink. The biology of mink reproduction is unique when comparing it with other farmed fur animals. The article emphasizes the importance of optimal environmental conditions in prevention of reproductive disorders. The novel attempts to the mating schedule, optimal diet and body condition of dams, kits transfer between dams, these are only examples of advantageous procedures used in mink farming to increase the effectiveness of reproduction.
Teleconference in Support of Autonomous Learning
Authors: Armakolas Stefanos , Panagiotakopoulos Christos , Karatrantou Anthi 
Published: March 2019

Abstract
In Distance education, learning depends on the ability of the learner to manage his/her learning process, both through the creation of appropriate objectives, and by adopting strategies to achieve them. The role of the teacher is to develop an efficient methodology with flexibility over the learners’ special characteristics and to create conditions to enable the learners to manage their learning process. This research aims to investigate the parameters which are involved in synchronous teleconference and which lead to effective learning through the support of an autonomous environment. The research was conducted with students of the Annual Training Program for Teachers of Higher School of Pedagogical and Technological Education Department in Patras. The results show that teleconference as teaching tool can support the autonomous learning and can enhance personalisation as this process can help students to learn and develop skills by receiving efficient support.
Characteristics of seed material and seedlings of Conium maculatum L.
Authors: Bilińska Elżbieta , Buchwald Waldemar 
Published: March 2019

Summary

Introduction: Fresh herbs of poison hemlock (Conii maculati herba) are used in homeopathy. The plant is also used in pharmacological and toxicological studies. There are few articles on seed germination capability in available literature.

Objective: The aim of the research was evaluation of Conium maculatum seed germination.

Methods: Germination studies of C. maculatum L. were carried out according to methodology by ISTA.

Results: It was confirmed that the germination capability of the described species is dependent on access to light and temperature fluctuations. In the first year after harvest, the highest percentage of germinating seeds was found in the winter months (January–February).

Conclusion: The seeds stored in an unheated room still germinated in the fifth year after harvest.
Experimental measurements for evaluation of the network throughput of the RC4 channel in the in-home PLC network
Authors: Róka Rastislav 
Published: March 2019

Abstract
For the expansion of in-home PLC networks, it is necessary to have a detailed knowledge of the PLC transmission channel properties. This contribution shortly discusses theoretical characteristics of the RC4 reference channel. A main part is focused on the network throughput and on the interphase PLC signal liaising presented in the RC4 reference channel for higher frequencies than 10 MHz. For evaluation of considered transmission parameters, experimental measurements related to various noise sources and to interactions between different phase conductors are realized in the real in-home PLC network.
Modelling of electronic and optical properties of Cu2SnS3 quantum dots for optoelectronics applications
Authors: Ahamed M. Irshad , Kumar K. Sathish 
Published: March 2019

Abstract
Copper tin sulfide (Cu2SnS3) is a unique semiconductor, whose nanocrystals have attracted researchers’ attention for its tunable energy bandgap and wavelength in visible and near infrared range. Quantum dots which are fabricated from this material are highly suitable for optoelectronics and solar cell applications. This paper discusses the tunable energy bandgap, exciton Bohr radius and wavelength range of wurtzite structure of Cu2SnS3 quantum dots to assess the opportunity to use them in optoelectronics applications. The considerations show that the mole fraction of copper increases as energy bandgap decreases and tunable energy bandgap of this quantum dot material is inversely proportional to the wavelength.
CdO-Fe3O4 nanocomposite with enhanced magnetic and photocatalytic properties
Authors: Nallendran R. , Selvan G. , Balu A.R. 
Published: March 2019

Abstract
Pure CdO nanopowder and CdO-Fe3O4 nanocomposite were synthesized by a cost effective chemical method, and the samples were characterized by XRD, SEM, TEM, FT-IR, UV-Vis-NIR and PL. Also, magnetic and photocatalytic properties of the synthesized samples were studied. XRD patterns of the composite confirm the presence of diffraction peaks related to both CdO and Fe3O4. EDX spectrum confirms the presence of the elements Cd, O and Fe in the composite. Peaks related to Cd–O and Fe–O bonds were observed respectively at 688 cm−1 and 592 cm−1 in the FT-IR spectrum. The paramagnetic behavior of pure CdO becomes ferromagnetic when coupled with Fe3O4. The composite exhibited a high photodegradation efficiency of 92.85 % against the degradation of methylene blue dye under visible light radiation.
To Explore the Effectiveness of Digital and Experiential Marketing in Attracting Customer Participation in the Hong Kong Wine and Dine Festival
Authors: Chui Margaret S. M. 
Published: March 2019

AbstractThe purpose of this study is to explore the effectiveness of digital and experiential marketing in attracting customer participation in the Hong Kong Wine and Dine Festival. This study explores the evolution of theories and models of digital and experiential marketing, and how they account for participation in a specific event. Findings show that variables related to media have moderate to strong relationship to customer satisfaction: owned media - HKTB Facebook, paid media - search engine, earned media - word-of-mouth, experiential marketing - escapist, experiential marketing - entertainment. Customer satisfaction also has a moderate relationship to customer loyalty. To boost the number of visitors, it is critical to better utilize the owned media – HKTB Facebook, paid media - search engine, and earned media – word-of-mouth to provide information and get positive feedback from visitors. The experiential marketing seems to be equally important and the marketer/organizer should consider providing escapist and entertainment experiences for visitors.A major limitation is the cross-sectional nature of this study. Future research could adopt a longitudinal approach by exploring issues related to promotional tools and types of experience over say three consecutive years. Another limitation is the sample size and type. Numbers are moderate and the snowball sampling adopted is non-probabilistic, which means that findings are suggestive rather than generalizable to all similar events.
Relevance of prolonged first mating in reproductive bioactivities of Dysdercus koenigii (Fabricius, 1775) (Heteroptera: Pyrrhocoridae)
Authors: Gupta Kamal Kumar , Shazad Mohd , Kumar Shailendra 
Published: March 2019

Abstract
Adults of Dysdercus koenigii remain in continuous copula for up to 72h. The adaptive significance of prolonged copulation in the reproductive bioactivities of D. koenigii was investigated by a series of interrupted mating experiments. The adults were allowed to mate for a specified duration, after which mating was forcibly terminated. The study indicated that insemination in the female takes place during the first day of mating. This was reflected by the observation that 24h mated females laid fertile eggs. Prolonged mating modifies the female’s reproductive behaviour. The duration of mating had a profound effect on the onset of oviposition as well as the total number of eggs and egg batches laid by a female during her lifetime. Female fertility was also correlated with the duration of mating. Therefore, a female mated for 24h laid fewer fertile eggs in comparison to females mated for 48h or 72h. Hatching success decreased significantly in the egg batches laid by a female during the latter part of her life. A mated female exhibited rhythmic ovipositional behaviour. Our results indicated that the rhythmicity of the oviposition changed as a consequence of the different duration of mating. For instance, in females mated for 24h, there was a change in the number of eggs laid and in the rhythmicity of ovipositional peaks. Further, the rate of oocyte growth appeared to be enhanced by mating. This was evidenced by the shorter inter-oviposition period in the case of females mated for a longer period. It is suggested that throughout mating, females acquire additional sperm and non-gametic resources, such as male accessory gland secretions, which govern their reproductive behaviour and physiology.
Modal Competition and Complementarity: Cost Optimization at End-User Level
Authors: Costescu Dan M. 
Published: March 2019

Abstract
The paper aims to identify possible methods for balancing the allocation of transport flow on modal subsystems in order to efficiently use the infrastructures and reduce the negative effects of today’s unbalance. The aspects of intermodal competition are reviewed, considering the economic concepts regarding the substitutability of transportation services, conformation degree to the perfect competition model and the nature of cross elasticity demand.
A top-down analysis over the whole infrastructure assembly is performed. The results, under the presumption of valid work hypothesis, indicated that for further analysis the set of networks transferring material flows can be assumed as disconnected from the other networks sets transferring energy, informational and values flows.
The second part of the paper develops, for that disconnected networks, a generalized cost optimization model for multimodal transportation, where the comfort and safety are accounted. Thus, the performance of the existing algorithms based only on trip length, trip duration and energy consumption can be significantly improved. Additionally, the author proposes three new independent types of modal analysis that allow end-users and companies involved in transport organization to optimize their modal choice and the whole transport process organization.
On the diet of owls (Strigiformes) in Jordan
Authors: Obuch Ján 
Published: March 2019

Abstract
Between 2005 and 2015 I undertook eight trips to Jordan during which I collected pellets from seven owl species. In them 14,203 food items were identified. Mammals (Mammalia, 46 species, 37.9% of prey items) formed the most numerous component, invertebrates (Evertebrata) made up 33.4%, birds (Aves, 25.4%) were represented with at least 104 species, reptiles (Reptilia) came to 3.2%, and two species of amphibian were identified (Amphibia, 0.2%). Pharoah eagle owls (Bubo ascalaphus) and Byzantine eagle owls (Bubo bubo interpositus) primarily hunt larger mammals and birds, although Agamidae and Scorpiones were also represented more frequently among B. ascalaphus. Mammals predominated among tawny owls (Strix aluco wilkonskii) (Mammalia, 58.9%), mainly the eastern rock mouse (Apodemus mystacinus) (24.9%). For wintering long-eared owls Asio otus otus the most important food was small birds (Aves, 78.3%), especially house sparrows (Passer domesticus), Fringillidae and Sylviidae. For barn owls (Tyto alba erlangeri) the principal prey was small mammals (83.1%), mainly mice (Mus sp.), Günther’s vole (Microtus guentheri), grey hamster (Cricetulus migratorius) and shrews (Soricidae). Hume’s tawny owl (Strix butleri) pellets contained mostly invertebrates (58.9%) and lizards, and their most frequent mammal prey were Wagner’s gerbil (Gerbillus dasyurus) and spiny mice (Acomys sp.). There was an even higher propostion of invertebrates (86.4%) among lilith owlets (Athene lilith). In addition to the insect orders Coleoptera, Orthoptera and Hymenoptera, remains of Scorpiones and Solifugae were also frequently found. The summarized results from individual owl species are compared with those gathered by the author in the surrounding Middle Eastern countries: Israel, Syria, Lebanon and Egypt.
Forms of iron in parent rocks of soils developed from Lower Triassic (Buntsandstein) deposits in the NE part of the Holy Cross Mountains (Poland)
Authors: Zagórski Zbigniew , Kisiel Monika 
Published: March 2019

Abstract
The aim of the study was to characterize pedogenic iron forms in the sediments of the Lower Triassic (Buntsandstein) in the north-eastern part of the Holy Cross Mountains. These are sediments of continental origin and unique features as the so-called ‘red beds’. Three main types of rocks were studied – sandstones, mudstones and claystones. Chemical forms of iron: Fet (XRF), FeHCl (6M HCl), Fed (dithionite-citrate-bicarbonate, DCB), Feo (ammonium oxalate), Fep (sodium pyrophosphate) were determined. The XRD method revealed the occurrence of goethite in sandstones and hematite in mudstones and claystones. Differential XRD (DXRD) analysis did not show the presence of amorphous iron minerals. The average Fet content in sandstones was 83 g·kg−1, in mudstones 47 g·kg−1, in claystones 55 g·kg−1, while there were lower concentrations of Fed (66 g·kg−1, 13 g·kg−1, 26 g·kg−1, respectively). Feo form content was in the range of 0.3–4 g·kg–1, while there were only traces of Fep. Only Fet and FeHCl occurred in good correlation. In the pedogenic interpretation of the studied rocks, mutual relations between chemical forms of iron were used and their reference to the identified iron minerals. Siltstones and claystones have high resistance to pedogenic factors, which is indicated by low release rates Fed:Fet and very low amorphization index Feo:Fed. The reason is the presence of well crystalline hematite in these rocks. In sandstones, resistance is conditioned by the occurrence of goethite in the matrix. Chemical destruction of iron-carbonate cement promotes the release and amorphization of iron in soils developed from sandstones. The presented results indicate that the specificity of Lower Triassic rocks is important for the proper classification and assessment of properties of soils with a characteristic red colour.
Restoration of soil-vegetation cover and soil microbial community at the Pechurki limestone quarry (Leningrad region, Russia)
Authors: Dmitrakova Yanina Aleksandrovna , Rodina Oksana Andreevna , Alekseev Ivan Ilych , Polyakov Vyacheslav Igorevich , Petrova Alina Aleksandrovna , Pershina Ekaterina Vladimirovna , Ivanova Ekaterina Andreevna , Abakumov Evgeny Vasilevich , Kostecki Jakub 
Published: March 2019

Abstract
Due to a significant increase in mining activity and subsequent ecosystem disturbances, it is becoming increasingly important to understand how degraded, unproductive quarries can be converted into new, self-sustaining communities that develop into natural environments. Former limestone quarry was investigated with aim to determine the best reclamation practice for surfaces of former lime rock quarries. Effects of spontaneous succession and forestry reclamation restoration approaches on vegetation and soil features were studied. The study was conducted in one of the largest limestone quarries of the Leningrad region, south taiga region. Species composition and vegetation cover were estimated for different plant communities within each ecotype of the quarry. Also soil characteristics were evaluated at each plot. We found that the main differences between plots were due to their position in the landscape; the most similar communities colonize similar ecotypes. On flat landforms, biodiversity is reduced under biological reclamation. At the sites under spontaneous succession, the level of biodiversity increases. In terms of biodiversity conservation and economic benefit, spontaneous succession is preferable to forestry reclamation for the restoration of carbonate substrates. After examining CO2 emissions from the quarry as a result of weathering of carbonates and soil respiration, as well as the level of CO2 sequestration from the atmosphere, we show that the establishment of certain landscape forms within former quarries can help to reduce atmospheric CO2.