bluuebunny/crossref_metadata_2025 huggingface dataset:
Simulación del Corazón Izquierdo para Aplicaciones en Docencia e Investigación
Authors: Cervino C. Nahuel , Cervino Claudio O.
Published: June 2018

Un modelo es una descripción lógica de cómo un sistema funciona o cómo se comportan sus componentes. Las herramientas de la modelización dinámica facilitan mucho la construcción de los modelos. El objetivo de este artículo es mostrar el desarrollo y los resultados del funcionamiento de un modelo interactivo de la fisiología del sistema cardiocirculatorio para el uso de estudiantes y otros interesados en la fisiología cardiovascular. El sistema de simulación está compuesto por  un modelo simple de cuatro componentes, y simula las siguientes variables y parámetros: a) variaciones del volumen aurícula izquierda (AI) y ventrículo izquierdo (VI); b) variaciones presión en AI, VI y aorta (Ao); c) flujo a través de válvula mitral (VM) y válvula aórtica (VAo), y d) reproduce el “efecto Windkessel” en Ao. Se utilizó el entorno de modelización Extend el cual provee una estructura integrada para la construcción de modelos de simulación y el desarrollo de nuevas herramientas de simulación. El corazón derecho y la circulación pulmonar no son considerados. Los resultados de este modelo simulan las características generales del corazón izquierdo y de la circulación arterial, considerando distintas situaciones fisiológicas y patológicas.
Estudio de la influencia de métodos de simulación en la enseñanza del tema Direccionamiento IP
Authors: Arias Figueroa Daniel , Díaz Francisco Javier , Gimson Saravia Loraine
Published: June 2018

Este artículo resume un estudio cuyo propósito fue determinar la influencia del uso de software de simulación en la enseñanza de conceptos y fundamentos en la asignatura Redes de Computadoras I en la Universidad Nacional de Salta. Si bien el estudio se circunscribe a una universidad, la situación descripta y analizada es muy similar en muchas otras. El estudio fue del tipo cuantitativo, con diseño experimental con grupo de control. Las pruebas paramétricas permitieron concluir que, existe diferencia estadísticamente significativa a favor de los estudiantes que emplearon una estrategia basada en simulación.
Cloning of Mouse β-actin Gene
Authors: Ji Chengjun , Wang Mingli , Wen Xuedong
Published: June 2018

β-actin gene is a kind of actin, in a variety of cells and tissues, β-actin gene expression is relatively stable [1], and β-actin gene in nuclear DNA has multiple copies, increased The detection rate of nuclear DNA [2], which is often used as an internal reference in PCR. In this experiment, the β-actin gene with good purity was obtained by PT-PCR, amplification, cloning, screening and PCR identification and restriction enzyme digestion of the RNA extracted from the mouse liver, which laid the foundation for the later experiment.
Advances in Synthesis and Application of Nanometer Drug Carriers
Authors: Wu Jianping , Wang Keming , Peng Yuquan
Published: June 2018

The main reason for the formation of nano-biotechnology is due to the penetration of nanotechnology in the biological field, nanotechnology research center is the study of nano-drug carrier. Nano-drug system targeted drug delivery to achieve drug release, increase the insoluble drugs and peptide drug bio-eﬃciency, reduce the toxicity and application of drugs and other aspects of the development of good prospects, and thus become one of the key research in recent years’ field. Synthesis and application of nanometer drug carriers this review is presented in recent years and its application to provide a comprehensive basis for the treatment process. Describes the nature and preparation of nano-drug carrier methods, in recent years, people have been widely concerned by scholars. Compared with the nano-drug delivery, the general pharmaceutical cannot have to extend the role of drugs, strong eﬃcacy, and the advantages of small drug response. Nano-materials, the specific surface area, surface activity, high catalytic efficiency, surface active center, adsorption capacity and other characteristics, which has many excellent features and new features.
C-dots dispersed macro-mesoporous TiO2 phtocatalyst for effective waste water treatment
Authors: Elkodous M. Abd , Hassaan (Dr.) Ahmed , PAL Prof (Dr.) KAUSHIK , Ghoneim (Dr.) A I , Abdeen (Dr.) Zizi
Published: June 2018

Synthesis of macro-mesoporous Titania (Titanium dioxide-TiO2) nanospheres was successfully achieved using a modified template-free methodology to incorporate macroporous channels into a mesoporous TiO2 framework to form mixed macro-mesoporous TiO2 spheres (MMPT), which were doped with carbon dots (C-dots) to form improved nanocomposites (C-dots@MMPT). Elemental composition, surface bonding and optical properties of these nanocomposites were characterized by X-ray diffraction (XRD), Fourier transforms infrared spectroscopy (FTIR) and ultraviolet-visible absorption spectroscopy (UV-VIS). Evaluation of photocatalytic activity for each (C-Dots@MMPT) sample was performed via degrading the Methylene Blue (MB) dye compared with bare samples (MMPT) under visible light irradiation using 300 Watt halogen lamp.
Interbank Market Interest Rate Risk Measure An Empirical Study Based on VaR Model
Authors: Peng Yuanyuan , Cheng Luoyuan , Zhu Yue
Published: June 2018

In this paper, we use the VaR model to study the daily weighted average interest rate of the interbank market in China from January 4, 2013 to October 30, 2014, and establish the interest rate risk measure of China's interbank lending market based on GARCH model (GARCH (1,1) / TARCH (1,1) / EGARCH (1,1)), the following conclusions are drawn: t distribution is not suitable for describing the distribution of interbank lending rate series in China, the generalized error distribution Which can better describe the distribution of interbank lending rates in China. According to the sample data, the risk of interbank lending rates at the present stage is also low.
Design of solar huts
Authors: Ling IJMSS , Chen Jinjuan , Pang Zhuoshou
Published: June 2018

This problem is a solar hut photovoltaic cell in the attached and overhead two installation methods, the type of photovoltaic cells and array mode and inverter type optimization design issues. In question 1, since the photovoltaic cells are attached to the roof and exterior surfaces, the direction and angle of the battery are uniquely determined by the direction and angle of the attached surface. The problem is translated to optimize the installation of a certain type on a single surface area (array) of photovoltaic cells, so that the total amount of solar photovoltaic power generation as much as possible, and the unit power generation costs as small as possible, which is a multi-objective optimization problem. The problem can be discussed in the ideal environment in a single surface area of the battery installation optimization program, and then the actual environment of the multi-surface optimization. In the solution to Problem 1, the unit on the south of the roof of the battery at the moment to accept the solar energy formula is generated. The definition of and is the moment of direct radiation intensity, for the moment the sun and the south of the roof of the plane where the angle, for the level of horizontal radiation intensity, for the south of the roof and the horizontal angle, the planefor the plane, the center of the heart, the vertical upward direction is the axis of the positive coordinate system, obtained with the sun height angle , the sun azimuth , red angle, angle and the sun when the relationship is generated. The conclusion is only installed in the small roof surface type of battery C11, and the rest of the surface is not installed. 35 years of electricity generation is 77126 degrees, the economic benefits of 16,488 yuan, the recovery period of 21.3 years. In question 2, because the photovoltaic cells in the roof and the external wall surface can be installed overhead, the panel orientation and tilt will affect the efficiency of photovoltaic cells. Therefore, in the optimization scheme of Problem 1, the orientation and inclination of the panel on each surface are further adjusted to calculate the optimum orientation and inclination of the panel on each surface. The problem can be in the ideal weather environment to establish the sun running and the battery board efficiency model, and then the measured environment test. The optimal orientation of the panel is southward, and the optimal angle with the ground plane is 39.89 degrees. The conclusion is only installed in the small roof surface type of battery C11, and the rest of the surface is not installed. 35 years of generating capacity of 82165.2 degrees, the economic benefits of 18,998 yuan, the recovery period of 13 years. In question 3, by the optimization of the above two issues, in the building to meet the requirements of the hut under the design of the various aspects of the cabin and battery installation, and further optimize the total power generation of the hut, economic benefits. The whole model solver is run in MATLAB7.0.
Preparation and Photocatalytic Properties of Ag2CO3 / Graphene Composite Photocatalyst
Authors: Chen Huanling , Xu Huaying , Dong Wenzhong
Published: June 2018

Silver-based photocatalytic semiconducting materials have drawn the attention of reseachers for their high visible photocatalytic activity. However, the silver-based photocatalytic semiconducting material exhibits light corrosion during the photocatalytic reaction, and the photocatalytic stability is poor. Therefore, improvingthe photocatalytic stability and inhibition of light corrosion of silver-based photocatalytic semiconductor materials have been the focus of attention. In this paper, according to the principle of photocatalysis and the principle of photo-corrosion, it is proposed to improve the photogenerated electrons and hole separation of photocatalytic semiconductor materials, to rapidly transfer photogenerated electrons, to inhibit photogenerated electrons and Ag + to prevent light corrosion, Stability of the catalyst. Ag2CO3 / GO composite photocatalytic materials were synthesized by precipitation method using polystyrene as photocatalyst. The characterization and photocatalytic performance tests showed that the graphene has a good auxiliary eﬀect, which can promote the separation of photogenerated electrons and holes of Ag2CO3 and transfer the photogenerated electrons into O2 in H2O in time, thus suppressing the light of Ag2CO3 / GO photocatalytic materials Corrosion phenomenon, improve the photocatalytic performance. Ag2CO3 / GO-1.0 has the best catalytic activity for the catalytic activity and stability of Ag2CO3 / GO in the photocatalytic decomposition of methyl orange. Therefore, graphene as a photocatalytic auxiliaries can eﬀectively improve the photocatalytic stability of silver-based photocatalytic materials and have some reference significance for improving the stability of other photocatalytic materials which are prone to light corrosion.
Spectral Properties of Transmission Amplitude Gratings
Authors: Pan Runming , Ji Chengwei , Cao Kaifeng
Published: June 2018

The core components of the precision instruments such as spectroscope and spectrograph is grating. And one-dimensional multi-slot transmission amplitude grating is the most simple, and its basic theory is also an important basis used as reference when perform grating design, this shows the important status of transmission amplitude grating in spectroscopy study. In this paper, the theory of Fraunhofer Diﬀraction in optics was used in introducing the basic conclusion and spectral pattern characteristics, with the concrete experiment the spectral pattern of transmission amplitude grating in the monochromatic light and complex light is showed, then the theoretical analysis was done by mathematical reasoning and numerical simulation, the specific expression of spectral characteristic parameters in transmission amplitude was study to confirm the eﬀects of these parameters on the produced spectral, results show that these parameters are independently. Through these studies, we understand that in the design of gratings should pay attention to the full consideration of these parameters and how to specifically improve the performance of the grating.
Synthesis and Luminescent Properties of Eu3+/Tb3+ Rare Earth Ions Doped Li2SrSiO4 Phosphors
Authors: Yu Kaitao , Wei Lifang , Shen Jiaqi
Published: June 2018

The series of luminescent materials of Eu3 +, Tb3 + doped Li2SrSiO4 were synthesized by a high-temperature solid-state method. The phase purity of the samples was measured by X-ray powder diﬀraction (XRD). The luminescent properties of the samples were studied by UV-visible excitation spectra and emission spectra The It is found that the strong absorption of Eu3 + doped Li2-xSr1-xEuxSiO4 is from the 250 ~ 290 nm charge transfer band of Eu3 + and the 7F0 → 5L6 absorption transition of 393 nm. The strongest emission of the emission spectra at 393 nm is 614 nm and 701 nm, respectively, from the 5D0 → 7F2 and 5D0 → 7F4 transitions of Eu3 +. Tb3 + doped sample Li2-xSr1-xTb xSiO4 excitation spectrum is mainly composed of Tb3 + ion fd transition and charge transfer band composed of broadband, the strongest absorption at 269 nm, the emission of the main emission of 5D4 → 7F5 transition (542 nm).
Characteristics of Ductile Shear Zone and Its Ore-controlling Eﬀect in Dongtian Polymetallic Mining Area
Authors: Liao Xuewei , Chen Xiangrun , Gao Wei
Published: June 2018

The genesis of the Red Pacific polymetallic deposit in Yanbian area has long been regarded as a volcanic hydrothermal deposit or a volcanic jet deposit. In the field investigation and comprehensive study, authors found that the so-called 'metamorphic volcanic rocks and volcanic clastic rocks' is actually a set of highly deformed terrigenous clastic rocks. The main rock types are metamorphic conglomerate, sericite schist, sericite to form a structural deformation belt having a width of 50-400 m. The deformed conglomerate rock is the conglomerate of the valley flag, and the latter two are the former siltstone, the silty mudstone and the tectonic deformation zone are basically the same as those of the strata and ore body. The red and Taiping polymetallic ore bodies are produced in the Miaopun Formation in the deformation zone. The ore and the surrounding rock also have certain deformation structures, such as pleated structure, shear page and so on. Therefore, the cause of this deposit is ductile shear zone type, layer structure ore control.
Analysis of Heavy Metal Pollution in Urban Surface Soil
Authors: Guo Quanling , Chen Cong , Du Jianbin
Published: June 2018

The impact of human activities on the quality of urban environment has become increasingly prominent and urban soil pollution problems on the health of local residents also gradually prominent. In addition, the study of heavy metal pollution in urban surface soil is an important part of the evolution model of urban geological environment so it is necessary to analyze the heavy metal pollution in urban soil. In this paper, the data of the given samples are processed and analyzed by MATLAB software and EXCEL spreadsheet. The three - dimensional image model and the planar model of metal element space are established by interpolation method. The spatial distribution of eight kinds of heavy metal elements in the city is presented in detail. For the urban environment, especially the macro-grasp of soil pollution, regulation provides a simple and accurate three-dimensional spatial distribution model of pollutants. Combined with data analysis of the urban area of diﬀerent areas of heavy metal pollution to make a preliminary judgment. The data show that in the five types of cities, heavy soil pollution is the most serious in industrial areas. A method of imagination of the data analysis is boldly used and then combined with the distribution map, they found a source of pollution. For the spatial distribution of heavy metal elements, this paper uses EXCEL to calculate the data and MATLAB to map the data which showed a detailed and intuitive distribution map according to the distribution map can be analyzed in diﬀerent areas of pollution; For the second question, this paper uses a method of design to deal with the data, part of the data for the results of the more eﬀective show to determine the cause of pollution. For the third question, this article will be more serious pollution or a wider range of local screening, analysis, and then speculate the location of pollution sources. For other pollution information, this article is based on the modeling process encountered in the thought of the factors given.
PAX2 regulates NRP-1 expression in renal tubular epithelial cellsto promote epithelial-to-mesenchymal transition and renal fibrosis
Authors: Hou Ling , Du Yue , Zhao Chengguang , Wang Xiuli , Wu Yubin
Published: June 2018

To observe the expression of neuropilin-1 (NRP-1) induced by paired-box gene 2 (PAX2) during the process of epithelial-to-mesenchymal transition (EMT) and renal fibrosis in unilateral ureteral obstruction (UUO) model in rats, and explore the mechanism of EMT induced by PAX2. Methods: The recombinant lentivirus expression vector for PAX2 was constructed and transfected into rat normal renal tubular epithelial cell line (NRK52E). The experimental cells were divided into three groups: transfection group, empty vector group, and normal group. E-cadherin and α-SMA were detected by western blot and real-time PCR. Expression of NRP-1 was detected by western blot, real-time PCR, and immunofluorescence. Sixty male Wistar rats were randomly divided into two groups: the sham-operation group (n=30) underwent left ureteral dissection, the UUO group (n=30) underwent left ureteral ligation. Post-operation on days 3, 7, 14, 21 and 28, 6 rats from each of the groups were sacrificed and the obstructed kidneys were dissected out. The histopathological changes were observed by hematoxylin-eosin and Masson staining. E-cadherin and α-SMA were detected by western blot and immunohistochemistry. Expression of NRP-1 and PAX2 were determined by western blot, immunohistochemistry, and real-time PCR. Results: Expression of NRP-1 mRNA and protein and α-SMA protein increased (P<0.05) while E-cadherin protein expression decreased (P<0.05) in the transfection group as compared to the empty vector group in vitro. In the UUO group, fibrosis was obvious, and there was decreased expression of E-cadherin protein (P<0.05) and increased expression of α-SMA protein and NRP-1 mRNA and protein (P<0.05) in comparison to the sham group. Conclusion: NRP-1 maybe mediate PAX2-induced EMT in renal tubular epithelial cells and renal fibrosis.
On the Causes of the Decrease of Biodiversity and the Countermeasures
Authors: Yuan Xinqun , Jiang Yanfen , Yan Zhihong
Published: June 2018

ABSTRACT This paper summarizes the concept, meaning, meaning and current situation of biodiversity. The main reasons for the reduction of biodiversity are as follows: natural, man-made and institutional reasons, among which man-made causes include habitat loss, excessive exploitation of biological resources, environmental pollution and invasion of alien species. The establishment of a system of natural reserve laws, the establishment of alien species management and regulatory system; in the conservation of sustainable use of biological resources; to strengthen international cooperation and action, the establishment of a comprehensive system of protection, , In order to promote China's biodiversity conservation work.
The Influence of Agricultural Water Conservancy Project on Environment
Authors: Yu Lei , Sun Tao
Published: June 2018

ABSTRACT In recent years, due to the rapid increase of China's economic level, agriculture and industry have developed vigorously, and the demand for electricity has increased accordingly. Water conservancy project construction investment is also increasing, too much water conservancy construction projects will inevitably affect the natural environment, the human environment. China's water conservancy and hydropower construction is facing a diﬃcult task. In terms of environmental impact, compared with other projects, water conservancy and hydropower projects have prominent characteristics: the impact of a wide geographical area, affecting the population, the local social, economic and ecological environment is huge, the external environment on the project also exert a huge impact The At present, the whole society has paid more and more attention to environmental problems, and the environmental quality has become higher and higher. Environmental problems have become one of the restrictive factors in the construction of water conservancy and hydropower projects. As the human environment continues to deteriorate, the public is increasingly concerned about environmental issues and sustainable development. At the same time, people are also aware that the impact of agricultural water conservancy construction on the environment is also twofold, so avoid or mitigate the adverse eﬀects, Fully rational use, is the water conservancy workers in the construction of agricultural water conservancy planning must be carefully studied and to solve the important issues.
Differences in Soil Remediation of Ecological Shelterbelt in Taihu Lake
Authors: Qiu Hongjian , Du Jianmin , Fang Xiaomin , Chen Meifang
Published: June 2018

In recent years, phytoremediation as a promising ecological restoration technique has emerged. Phytoremediation is a repair method that uses green plants to transfer, contain, or convert contaminants to the environment. Phytoremediation is a heavy metal, organic or radioactive element contaminated soil and water. The results show that the use of plant absorption, volatilization, root filtration, degradation, stability and other effects, can purify soil or water pollutants, to achieve the purpose of purifying the environment, so phytoremediation is a great potential, the development of the clean environment Pollution of green technology. The use of plants to repair contaminated soil is a cheap and durable bioremediation technique. The protection and management of Taihu Lake is an indispensable measure for the protection of Taihu Lake water, and the advantages of phytoremedry investment, low freight and low leakage of pollutants show that its promotion has this unusual significance. This paper expounds the difference of remediation soil between Taihu Lake Ecological Shelter Forest, and the comparison of the soil capacity of the experimental tree species. Second, the correlation between the monitoring projects is discussed.
Study on Ecological Garden and Plant Configuration in Shenyang Area
Authors: Li Anping , Zhu Yourong , Zhang Qiang , Kang Xiaolei , Guo Kai
Published: June 2018

In addition to create a beautiful and comfortable environment for human beings, it is more important to create an ecological environment suitable for human beings. Plant landscaping is no longer just the use of plants to create visual eﬀects of the landscape, it also contains the ecological landscape, cultural landscape and even deeper meaning. In this article, the concept of ecological garden the benefits produced and the related content of plant landscaping are analyzed, and the situation of plant disposition and existing problems in Shenyang area are analyzed concretely.
Preliminary Bioinformatic Analysis of Gallus gallus (Chicken) CD8a Gene
Authors: Gong Zhongling
Published: June 2018

The experimental object of this study is Gallus gallus (chicken) CD8a gene. In this study, we performed sequence analysis of CD8a gene and analyzed the primary structure, secondary structure and tertiary structure of CD8a encoded protein by using bioinformatics. Through the analysis, we concluded that the sequence length is 648bp with various restriction sites identified, which is similar to CD8a of other species in Galliformes order. The sequence encodes a total of 216 amino acids. The amino acids have low hydrophobicity, with 12 phosphorylation sites and a transmembrane region, and no signal peptide. The protein secondary structure mainly consists ofαspiral, accounting for 22.69%; extension chain, accounting for 15.74%; random coil, accounting for 61.57 %, in non-continuous distribution. The relationship between CD8a and other species homologous sequences is basically consistent with the establishment of the system tree by the establishment of three trees. n the root tip cells of Vicia faba and increase in micronucleus rate. The results showed that the water extract of Solidago canadensis had different degree of inhibition and damage to silkworm root tip cells; it also had some genetic toxicity and rapid diffusion ability.
EDTA and kKCI Doped KDP Solution and Thermodynamics Principle of Crystallization Process
Authors: Li Dehong , Bai Ruifang , Huo Zhangang
Published: June 2018

Abstract: Potassium dihydrogen phosphate, KH2PO4 (KDP) crystal is an excellent electro-optical nonlinear optical crystal with large electro-optical nonlinear coefficient, high laser damage threshold, and laser frequency doubling effect, electro-optical effect , Piezoelectric effects and other special features, widely used in inertial confinement fusion engineering (ICF) and electro-optical switching devices. Therefore, its growth mechanism, growth process and performance have been systematically studied. In the process of KDP crystal growth, it is found that the stability of the growth solution is an important factor affecting the quality of crystal growth. Therefore, in recent years, more and more research on the stability of the solution, such as the study of ph, doping, supersaturation, overheating time on the stability of the solution. Among them, the research on the doping is mostly reported, and the research on this aspect is mainly focused on two aspects. On the one hand, it is the study of the stability of the solution under doping, and the other is the effect of doping on the optical quality of the crystal. In fact, the stability of the growth solution and the quality of crystal growth is directly related to the quality, but the existing research to isolate the two researches. Therefore, the experiment will be carried out in the case of double-doped KDP solution stability, KDP crystal growth and crystal optical quality and other experiments, and in-depth analysis of the impact of solution stability and crystal optical quality of the reasons, while the solution stability and The relationship between the optical quality of the crystal is briefly analyzed.
Research Status and Application of AirSource Heat Pump Technology
Authors: Meng Hongtao , Tang Jihui , Huang Haifeng
Published: June 2018

Abstract: With the improvement of people's living standards, water heaters almost into the various households. In the energy-saving emission reduction has become the trend of the times today, saving energy and reducing carbon emissions is the most fashionable way of life. Air source heat pump water heaters are increasingly being used in people's lives. It is well known that it has many advantages, safety, energy saving, comfort, environmental protection, but there are some factors that affect its development and promotion. This paper mainly discusses the development history of air source heat pump technology at home and abroad, working principle, working flow, turbo technology at present stage, efficient heat exchange, and the research status of air source heat pump technology, such as new type refrigerant and dual frequency compression frequency conversion, then it discusses the application of air source heat pump technology, has the advantage, and finally discusses its application and the existence of two major problems and suggestions for improvement. Key words:air source heat pump; water heater; energy saving and emission reduction; research status
A survey of the functional, gut digestive, and serum antioxidant factors in Salmo trutta caspius (Kessler) fingerlings with the application of a dietary synbiotic
Authors: Aftabgard Maryam , Salarzadeh Alireza , Mohseni Mahmoud , Shabanipour Amir Houshang Bahri , Zorriehzahra Mohammad Ebrahim Jalil
Published: June 2018

This study evaluated the effectiveness of BetaPlus® combined with isomalto-oligosaccharide (IMO) in Caspian brown trout, Salmo trutta caspius (Kessler), fingerlings. A total of 120 Caspian brown trout (8.75 ± 0.03 g) were fed in two treatments, including the control diet and the synbiotic diet (0.1% BetaPlus® + 0.2% IMO) in three replicates per treatment for seven weeks. The growth indices (final weight, weight gain, average daily growth, specific growth rate, feed efficiency, and protein efficiency ratio) exhibited significant improvement in the fish fed the synbiotic diet (P < 0.05). The highest ash crude protein, and crude fiber, as well as the lowest crude lipid, dry matter, and carbohydrate detected in the carcass of fish treated with the synbiotic were significant (P < 0.05). In addition, the fish fed the synbiotic diet showed significantly higher gut trypsin activity and trypsin:chymotrypsin ratio, as well as serum superoxide dismutase activity (P < 0.05). Thus, BetaPlus® in combination with IMO can effectively lead to a considerable increase in functional factors, as well as gut proteases and serum antioxidant indicators in S. trutta caspius fingerlings.
Reintroduction of sturgeon, Acipenser oxyrinchus, in the Gulf of Riga, East-Central Baltic Sea
Authors: Purvina Santa , Medne Ruta
Published: June 2018

Atlantic sturgeon, Acipenser oxyrinchus Mitchill, inhabited and spawned in the territorial waters of Latvia from the early Neolithic. The A. oxyrinchus population in this area started to decline from the end of seventeenth century. By the twentieth century, just several sturgeon catches were documented. In 2012, Latvia joined the initiative to reintroduce native A. oxyrinchus. From 2013 to 2015, the Institute of Food Safety, Animal Health, and Environment (BIOR) released 4,500 A. oxyrinchus juveniles aged 1+ and 2+. The majority of sturgeon juveniles released inhabit the Gulf of Riga and Pärnu Bay and marine areas among the Estonian islands. Nearly all of the sturgeon released exhibit remarkable growth. The absence of visible pathologies suggests that the A. oxyrinchus individuals are in excellent condition. Increases in size and the absence of visible pathologies also suggest that A. oxyrinchus has a sufficient food base. Additionally, results indicate that there is free space in the food web for native Atlantic sturgeon. Sturgeon is caught primarily in salmon traps and other commercial fishing nets deployed at depths of 4-10mor by anglers. While we do not have complete information about the fates (dead or alive) of all sturgeons caught, approximately half of them that were reported by fishers were released back into the sea alive and healthy.
Case study of the diet and parasite fauna of and extremely rare fish species Lumpenus lampraeteformis (Perciformes, Stichaeidae) from the Gulf of Gdañsk (south Baltic Proper)
Authors: Więcaszek Beata , Sobecka Ewa , Szulc Marek , Górecka Klaudia
Published: June 2018

The snakeblenny, Lumpenus lampretaeformis, is a post glacial relict from the last ice age in the Baltic Sea. Reliable data on its diet, parasite fauna, distribution, population size, and population trends in the Baltic Sea are lacking. In the Polish zone it has been observed only in ICES subdivisions 25 (Slupsk Furrow) and 26 (Puck Bay, Krynica Morska, Władysławowo and Vistula mouth fishing grounds) at depths of 30-70 m; however, in recent decades only one finding of snakeblenny in Polish waters has been reported. This paper reports the record of one female specimen from the Gulf of Gdañsk. The individual’s morphological characters, stomach contents, parasitic fauna, age and gonadosomatic index were examined. The parasitological examination, which was undertaken for the first time on a specimen from the Baltic Sea since the 1930s, revealed that L. lampretaeformis was the host of one parasite species, namely a juvenile acanthocephalan Echinorhynchus gadi. Additionally, Pontoporeia fermorata and Halicryptus spinulosus were recorded in the stomach of snakeblenny for the first time in the Baltic Sea.
The concept of modification and analysis of the strength of steel roadway supports for coal mines in the Soma Basin in Turkey
Authors: Grodzicki Marek , Rotkegel Marek
Published: June 2018

The article presents a comparison of the roadway supports currently used in mines in the Soma basin in Turkey with new one proposed by Huta Łabędy and Central Mining Institute (GIG) in terms of resistance parameters and work in conditions of specific loads. The strength analysis of the frame was carried out using the finite element method, using the COSMOS/M program, based on the methodology developed and applied in GIG.

The frame models were built corresponding to their geometry and cross-sectional parameters of the sections used. Beam elements (BEAM3D) were used for building models, which were given cross-sectional parameters of the V36 section. This resulted in three frame models that were loaded in three ways (three load variants). The first option included roof load, acting on the roof bar in a uniform manner, at a length of about 3.0 m. In the second variant, the same load was adopted but the resistance of the side wall was omitted. However, in the third variant, the same roof load was assumed in addition to a side load, acting on the sliding arch, at a length of about 3.0 m, a value corresponding to half the load of the roof. As a result of the calculations carried out, the distribution of reduced stresses in the analysed frames and the maximum load values were obtained.

The proposed roadway supports retain the functionality of the previously used frames in terms of width, height, cross-sectional area of the support and the number of elements. They are characterised by the same weight and at the same time, they have up to 24% more load capacity because of the replacement of straight sections of curved side sections. This treatment was possible by forming individual elements of the arch with two bending radii. The additional load increase was obtained by using S550W steel.
María Concepción Gavira Márquez, coord. Instituciones y actores sociales en América. Morelia: Cuerpo Académico Historia de América, Facultad de Historia, Universidad Michoacana de San Nicolás de Hidalgo, 2009, 266 p. ISBN 978-607-424-069-6
Authors: Nava Hernandez Eduardo
Published: June 2018

Reseña del libro coordinado por María Concepción Gavira Márquez y el Cuerpo Académico Historia de América de la Facultad de Historia de la UMSNH en 2009.
Entre el poder y la autoridad: Mateo Marquín, capitán general de yaquis y mayos de 1843 a 1857
Authors: García Rivera Lucía , Trejo Zulema
Published: June 2018

Las interrelaciones entre los grupos indígenas de Sonora y el Estado han sido un tema recurrente en la historiografía regional de las últimas décadas, abordando mayormente aspectos de enfrentamientos y resistencias. Actualmente la producción historiográfica ha tomado un nuevo auge profundizando en las relaciones establecidas a través de la negociación y pacificación del territorio indígena. Dentro de esta última perspectiva, este trabajo es una aproximación al estudio del liderazgo indígena en Sonora a través de Mateo Marquín, capitán general del Valle del Yaqui y Mayo. Lo anterior se realiza a través de la propuesta analítica de Martha Bechis y su diferenciación entre el poder y autoridad. Se utilizan como fuentes los informes oficiales y la correspondencia intercambiada entre los capitanes generales. Partiendo de lo anterior, buscamos aproximarnos al tipo de liderazgo ejercido por Marquín durante 1840 y 1850 en Sonora, así como la efectividad de su intermediación.
De monstruos y fenómenos naturales. Historia cíclica, presagios y destrucción de imperios en el Altiplano Central durante el Posclásico
Authors: Echeverría García Jaime
Published: June 2018

En el pensamiento nahua precolombino, el ocaso de ciudades e imperios era augurado por señas celestes y terrestres que rebasaban los eventos naturales y cotidianos de la vida diaria, y que por su misma extrañeza generaban un profundo terror. Estos vaticinios eran promovidos por las divinidades como consecuencia de las transgresiones que había cometido el gobernante. Las señales terrestres, encarnadas en la figura de monstruos, también anunciaban la imposición de un nuevo orden político. La destrucción y el advenimiento de imperios en el Altiplano Central durante el Posclásico forman parte de un mismo modelo de acontecimientos que pueden ser interpretados de manera semejante, lo que refuerza la concepción cíclica de la historia entre los antiguos nahuas. Uno de los principales aportes del texto es el abordaje del monstruo desde una visión mesoamericana, donde se destaca el simbolismo de sus características físicas particulares y su significado en la cosmovisión nahua
Las minas marinas del Golfo de California: del extractivismo a la sustentabilidad
Authors: Cariño Micheline , Monteforte Mario
Published: June 2018

Las ostras perleras son moluscos bivalvos marinos productores de nácar y perlas. Los pueblos originarios del Golfo de California las consumían como alimento, luego, entre 1533 y 1939, las conchas y las perlas naturales fueron el principal producto comercial marino. Tuvieron una explotación comparable a las minas de metales por las formas de apropiación asimétrica del espacio y la explotación del trabajo. En los puertos regionales, el trasiego de las armadas perleras detonó la navegación y el comercio. En 1940 el recurso se agotó debido al impacto del buceo mecanizado (desde 1874), a la destrucción de la Compañía Criadora de Concha y Perla (1914) y a cambios ambientales. Actualmente, el cultivo extensivo de ostras perleras, combinado con el de especies comestibles, puede contribuir a la sustentabilidad regional. Empleamos la larga duración para dar un recuento de la historia ambiental de uno de los principales recursos pesqueros del Gofo de California.
A medio siglo de manejo pesquero en el noroeste de México, el futuro de la pesca como sistema socioecológico
Authors: Cisneros-Montemayor Andrés M. , Cisneros-Mata Miguel A.
Published: June 2018

El manejo pesquero en el noroeste de México debe reconocer plenamente a la pesca como parte de un sistema socio-ecológico. Este estudio describe la evolución y situación del manejo, incluyendo la dinámica entre instituciones de manejo y organizaciones conservacionistas, resaltando oportunidades y retos para alcanzar la sustentabilidad ecológica y social. En este contexto, el reconocimiento de la pesca artesanal como actividad social además de económica, facilitaría la evolución de los esquemas de gobernanza y manejo para empatarlos con los objetivos sociales. Ello permite abordar de lleno temas de suma importancia, incluyendo los retos de las comunidades pesqueras indígenas, o los impactos anticipados del cambio climático. El conocimiento científico y la experiencia acumulados en cinco décadas representan una gran capacidad para desarrollar estrategias novedosas para transitar hacia la sustentabilidad del sistema. El éxito de este proceso dependerá de la habilidad de consolidar una visión unificada sobre los beneficios deseados, en especial para las comunidades pesqueras.
Catherine Andrews. De Cádiz a Querétaro. Historiografía y bibliografía del constitucionalismo mexicano. México: Fondo de Cultura Económica, CIDE, 2017, 193 p. ISBN 978-607-16-4472-5 (FCE); 978-607-9367-98-5 (CIDE)
Authors: Mora Muro Jesús Iván
Published: June 2018

Catherine Andrews, especialista en el constitucionalismo mexicano y profesora-investigadora del Centro de Investigación y Docencia Económicas (CIDE), recientemente ha emprendido la complicada labor de realizar un balance de las investigaciones más representativas e influyentes que han analizado, desde diferentes enfoques y tendencias ideológicas, las leyes y cartas magnas del país.
Sàng lọc in silico, thiết kế phân tử và tổng hợp các hợp chất hóa học có tác dụng ức chế enzym histon deacetylase (HDAC)
Authors: Hải PhạmThế
Published: June 2018

Nghiên cứu thuốc điều trị ung thư mới hiện nay đang là mối quan tâm hàng đầu của thế giới. Một trong số các mục tiêu phân tử đáng chú ý là enzym Histon Deacetylase (HDAC). Hiện nay, khoa học máy tính ngày càng được sử dụng rộng rãi trong tìm kiếm và phát triển thuốc mới. Trong nghiên cứu này, các công cụ máy tính, bao gồm các mô hình liên quan định lượng cấu trúc-tác dụng (QSAR) và phương pháp mô phỏng phân tử docking đã được sử dụng để thiết kế và sàng lọc nhằm tìm kiếm các hợp chất hoá học mới, có hoạt tính ức chế mạnh enzyme HDAC2, có tiềm năng để phát triển thành thuốc chống ung thư. Kết quả quan trọng nhất của đề tài là đã sàng lọc tìm được 3 nhóm cấu trúc mới, chưa từng được nghiên cứu tác dụng trên đích HDAC cũng như tác dụng kháng ung thư. Trong đó hợp chất acid ibandronic này ức chế 50% hoạt tính của enzym HDAC chiết từ tế bào ung thư vú ở nồng độ 15 µM và có độc tính tế bào mạnh ở mức nồng độ <50 µM trên 3 dòng tế bào ung thư (vú, tiền liệt tuyến và phổi). Ứng dụng phương pháp thiết kế cấu trúc phân mảnh ISIDA, 6 dãy dẫn chất của acid hydroxamic mới được thiết kế. Trong đó hợp chất tích hợp nhân oxoindolin được lựa chọn để tổng hợp và thử hoạt tính ức chế HDAC2. Kết quả cho thấy 3 hợp chất được tổng hợp có hoạt tính ức chế enzym IC50 từ 1,70-6,24 µM. Đặc biệt hợp chất 4a có hoạt tính mạnh tương đương với một thuốc ức chế HDAC mạnh hiện đang lưu hành trên thị trường là Vorinostat (SAHA). Nghiên cứu đặc điểm lý hoá cũng như mô phỏng phân tử cho thấy các hợp chất này có đặc điểm giống thuốc phù hợp cho nghiên cứu sâu hơn nhằm phát triển thành thuốc chống ung thư mới trong tương lai.
Đặc điểm kiểu gen của BK polyomavirus trên bệnh nhân sau ghép thận ở miền Bắc Việt Nam
Authors: Dinh Thi Thu Hang
Published: June 2018

BK polyomavirus (BKV) is a ubiquitous opportunistic infection among humans and causes BKV-associated nephropathy (BKV) after renal transplantation. BKV strains woldwide are classified into 4 genotypes (I-IV) in which genotype I and IV are detailed divided into 4 and 6 subtypes, respectively. This study analyzed genotypes of 6 BKV strains from 20 specimens including plasma and urine from renal allograft recipients in Northern Vietnam based on VP1 sequences 580 bp in length which were cloned in pGEMT-easy vector by conventional methods. VP1 genes of BKV strains were analyzed by BLAST (NCBI), Bioedit software, and combined with MEGA7.0 software to construct and analyze the phylogenetic tree. Several mutations (8-39/ 580 nucleotides) were identified in all 6 BKV strains compared to reference Dunlop BKV strain, in which BKV1 strain isolated from BKVN patient, subtype IVc had the most mutation nucleotides was 39/ 580 nucleotides. The remaining 5 strains of BKV were genotype I. The study provided a valuable fundamental molecular database contributing to monitoring as well as screening strategies and treatment options of BKV in kidney allograft recipients in Vietnam.
Bui Thi Xuan1*, Vu Duc Loi1, Một số hợp chất phân lập từ lá cây Khôi đốm (Sanchezia nobilis Hook.f.)
Authors: Vu Duc Loi
Published: June 2018

Từ phân đoạn dịch chiết ethylacetat của lá cây Khôi đốm (Sanchezia nobilis Hook.f.) thu hái ở tỉnh Nam Định và bằng phương pháp sắc ký cột đã phân lập được 3 hợp chất. Cấu trúc hóa học của các hợp chất này được xác định bằng phương pháp phổ như: phổ khối, phổ cộng hưởng từ hạt nhân. Các chất được xác định là: 9-methoxycanthin-6-on (1), 9-hydroxyheterogorgiolid (2), O-methyl furodysinin lacton (3). Các hợp chất này lần đầu tiên được phân lập từ cây Khôi đốm.
Gri kurt optimizasyon algoritması ile iki boyutlu dizilim yazılımının geliştirilmesi
Authors: ŞENEL Fatih Ahmet , YÜKSEL Asım Sinan , GÖKÇE Fatih , YİĞİT Tuncay
Published: June 2018

Bu çalışmada iki boyutlu düzensiz şekillere sahip deri ayakkabı kalıplarının, yine düzensiz şekle sahip doğal deri materyali üzerine en az fire verecek şekilde dizilmesini gerçekleştiren bir yazılım geliştirilmiştir. Geliştirilen yazılım hem otomatik dizilim işlemini hem de el ile dizilim işlemini yapabilecek düzeydedir. Otomatik dizilim işlemi, literatürde son yıllarda popüler olan Gri Kurt Optimizasyonu algoritması kullanılarak gerçekleştirilmiştir. El ile dizilim işlemi ise, kullanıcıların bilgisayarın faresini kolaylıkla kullanabilecekleri şekilde tasarlanmıştır. Yazılım, Microsoft Visual Studio 2010 ortamında C# programlama dili ile geliştirilmiştir. Sonuçta hem el ile hem de otomatik olarak dizilim işlemlerinin başarılı bir şekilde yapılabildiği görülmüştür.
Parent-initiated motivational climate and selfdetermined motivation in youth sport
Authors: Kolayiş Hakan , Çelik Nurullah
Published: June 2018

There are many determinants of sports motivation such as athletes’ personal characteristics, coaches, peers, parents and the other environmental factors. In this research, the aim was to analyse whether there was a relationship between perceived parent-initiated motivational climate and self-determined motivation of karate athletes. Karate athletes (N=325) participated in the research and completed the adolescent version of the Sport Motivation Scale and Parent-Initiated Motivational Climate Questionnaire. Multiple regression analyses showed that the athletes’ self-determined motivation significantly correlated with learning and enjoyment climate, worry-conducive climate and success-without-effort climate perceived both in father and mother. Besides, regression analysis showed that perceived family climate significantly contributed to selfdetermined motivation. Linear combination of father learning and enjoyment climate (β=.21), father successwithout effort climate (β=-.17), and mother success-without-effort climate (β=-.14) significantly contributed to self-determined motivation (F(3,321)=18.88, R2=.15, p<.001). In conclusion, the results indicated that athletes’ perception of parent-initiated motivational climate was important for their self-determined motivation. The findings were evaluated and some implications for parents were proposed.
Effects of game location, quality of opposition, number of foreign players and anthropometric characteritics in elite handball games
Authors: Debanne Thierry , Laffaye Guillaume
Published: June 2018

The aims of this study were (1) to investigate the influence of game location, quality of opposition, age of players, and anthropometric characteristics of backcourt and pivot players as well as the number of foreign players in a team on goal difference between the teams in the French (LNH) and German (Bundesliga) national men’s professional leagues, and (2) to predict goal difference of match final scores in these two national leagues using a multiple regression model. Archival data were obtained from the open access official websites to collect a sample of 165 handball matches (LNH [N=89], and Bundesliga [N=76]) of the first part of the 2015/2016 regular season. The linear regression model predicted the winner in 79% of cases with a mean accuracy of four goals. The coefficients of determination found in both multiple regression models were r²=.67 and r²=.49 for the LNH and the Bundesliga, respectively. The models revealed a high contribution of the difference in the end-of-previous season goal-average per match ranking and a moderate contribution of the game location to goal difference. The models also highlighted differences in the way games were won in these leagues with a contribution of foreigners, anthropometric characteristics and age only in the Bundesliga.