bluuebunny/crossref_metadata_2025 huggingface dataset:
Production dynamics reveal hidden overharvest of inland recreational fisheries
Authors: Embke Holly S. , Rypel Andrew L. , Carpenter Stephen R. , Sass Greg G. , Ogle Derek , Cichosz Thomas , Hennessy Joseph , Essington Timothy E. , Vander Zanden M. Jake
Published: November 2019

Recreational fisheries are valued at $190B globally and constitute the predominant way in which people use wild fish stocks in developed countries, with inland systems contributing the main fraction of recreational fisheries. Although inland recreational fisheries are thought to be highly resilient and self-regulating, the rapid pace of environmental change is increasing the vulnerability of these fisheries to overharvest and collapse. Here we directly evaluate angler harvest relative to the biomass production of individual stocks for a major inland recreational fishery. Using an extensive 28-y dataset of the walleye (Sander vitreus) fisheries in northern Wisconsin, United States, we compare empirical biomass harvest (Y) and calculated production (P) and biomass (B) for 390 lake year combinations. Production overharvest occurs when harvest exceeds production in that year. Biomass and biomass turnover (P/B) declined by ∼30 and ∼20%, respectively, over time, while biomass harvest did not change, causing overharvest to increase. Our analysis revealed that ∼40% of populations were production-overharvested, a rate >10× higher than estimates based on population thresholds often used by fisheries managers. Our study highlights the need to adapt harvest to changes in production due to environmental change.
A high-resolution landscape of mutations in the
BCL6
super-enhancer in normal human B cells
Authors: Shen Jiang-Cheng , Kamath-Loeb Ashwini S. , Kohrn Brendan F. , Loeb Keith R. , Preston Bradley D. , Loeb Lawrence A.
Published: November 2019

The super-enhancers (SEs) of lineage-specific genes in B cells are off-target sites of somatic hypermutation. However, the inability to detect sufficient numbers of mutations in normal human B cells has precluded the generation of a high-resolution mutational landscape of SEs. Here we captured and sequenced 12 B cell SEs at single-nucleotide resolution from 10 healthy individuals across diverse ethnicities. We detected a total of approximately 9,000 subclonal mutations (allele frequencies <0.1%); of these, approximately 8,000 are present in the
BCL6
SE alone. Within the
BCL6
SE, we identified 3 regions of clustered mutations in which the mutation frequency is ∼7 × 10
−4
. Mutational spectra show a predominance of C > T/G > A and A > G/T > C substitutions, consistent with the activities of activation-induced-cytidine deaminase (AID) and the A-T mutator, DNA polymerase η, respectively, in mutagenesis in normal B cells. Analyses of mutational signatures further corroborate the participation of these factors in this process. Single base substitution signatures SBS85, SBS37, and SBS39 were found in the
BCL6
SE. While SBS85 is a denoted signature of AID in lymphoid cells, the etiologies of SBS37 and SBS39 are unknown. Our analysis suggests the contribution of error-prone DNA polymerases to the latter signatures. The high-resolution mutation landscape has enabled accurate profiling of subclonal mutations in B cell SEs in normal individuals. By virtue of the fact that subclonal SE mutations are clonally expanded in B cell lymphomas, our studies also offer the potential for early detection of neoplastic alterations.
Roles of ErbB3-binding protein 1 (EBP1) in embryonic development and gene-silencing control
Authors: Ko Hyo Rim , Hwang Inwoo , Jin Eun-Ju , Yun Taegwan , Ryu Dongryeol , Kang Jong-Sun , Park Kye Won , Shin Joo-Ho , Cho Sung-Woo , Lee Kyung-Hoon , Ye Keqiang , Ahn Jee-Yin
Published: November 2019

Significance

Ebp1
deletion causes developmental defects with massive cell death and cessation of cell proliferation through dysregulation of epigenetic gene silencing unit, a Suv39H1/DNMT1 axis. Our study indicates that EBP1 regulates global gene expression via at least 2 mechnaisms. First, EBP1 acts as a transcriptional repressor for DNMT1 gene expression, allowing the escape of the repressive chromatin state. Second, EBP1 binds to the promoter region of the target gene inhibiting the association of DNMT1 with the downstream gene such as
Survivin
, regulating gene expression. Hence, these findings provide a molecular mechanism of how EBP1 functions in cell survival and transcriptional regulation by modulating epigenetic regulators during development.
Reading comprehension across languages
Authors: McClung Nicola A. , Pearson P. David
Published: November 2019

Orthographic depth, the degree of spelling-to-sound consistency in a language, has been hypothesized to affect the ease with which children learn to read words. However, the relationship between orthographic depth and reading comprehension is less well understood. In this study, focusing on countries in which two international assessments (PISA and PIRLS) were given in two or more languages, we examine data from elementary and high-school readers of Finnish, Swedish, Italian, German, Dutch, French and English). Findings suggest that that there may be some trade-offs between shallow and deep orthographies in terms of the specific ways that they map onto the phonological and deep meaning representations required for cognitive processing during an activity such as comprehension. These trade-offs serve to differentially support or inhibit readers depending on where they are situated on the achievement continuum.
Effects of non-native word shapes in the recognition and recall of medicine names
Authors: Pires Carla , Correia Susana , Costa Márcia , Cavaco Afonso , Vigário Marina
Published: November 2019

Mistakes involving medicine brand names may lead to serious medication errors and even patients’ death. We tested the effect of medicine brand names shape – native vs. non-native spelling – in two groups of Portuguese speaking subjects: (i) pharmacy clients (older and less educated); (ii) graduate students (younger and more educated). We run a recognition task and an immediate recall task, testing three groups of names with: (1) non-native graphemes, (2) non-native grapho-/phonotactics, (3) native patterns. Results showed that names with non-native properties, especially non-native graphemes, were recalled significantly worse. Non-native patterns had a null effect in the recognition task, possibly due to a facilitating effect of the odd, non-native feature, compensating for the extra demand imposed by non-native patterns on processing. Less educated, older participants consistently performed significantly worse than more educated, younger subjects across experiments. The results suggest the pertinence of adapting medicine names to the language of target users.
The development of adverbial clause functions in Hebrew narrative and expository writing across adolescence
Authors: Brandes Gilad , Ravid Dorit
Published: November 2019

Interclausal subordination, serving various functions in written discourse, has been studied mostly from a quantitative perspective in later language development. The current study applied a discourse-functional approach to a quantitative and qualitative examination of subordinate Adverbial Clauses (ACs) in Hebrew writing development.

Analysis targeted narrative and expository texts, written by Hebrew speaker-writers in grades 4, 7, 11, and university students. Adverbial clauses were counted, and classified according to function. In narratives, they delineated either plotlineevents, surroundingdescriptions, or subjectiveinterpretations. Expository ACs served toenlarge onthe current argument,anchornew arguments in previous discourse, ormove on, initiating a new topic.

Narrative ACs had similar prevalence across development, but shifted functionally, favoring interpretive roles in older writers. Expository ACs retained their enlarging-on and anchoring functions, while decreasing in quantity, parallel to an increase in alternative, clause-internal devices. The study underscores the usefulness of a functionally-oriented perspective in revealing developmental changes in the syntax-discourse interface.
Coherent Controlling Single Photon Asymmetric Transmission in the Atom Chirally Coupled Waveguide System*
Authors: Hu Wei , Ma Xiao-San , Wang Bing , Huang Xian-Shan , Cheng Mu-Tian
Published: November 2019

We theoretically investigate the influences of two coherent driving fields on the asymmetric transmission of single photon in the atom-waveguide system. The atom is considered as a Λ system. One transition of the atom chirally couples to the waveguide. The other transition is driven by two coherent driving fields. The transmission probabilities for the single photon incidents from the left (Tlr
) and right (Trl
) are given respectively. The calculated results show that one can realize Tlr
= 0 (Trl
≠ 0) or Trl
= 0 (Tlr
≠ 0) by manipulating the phase difference between the two coherent driving fields. The influence of the decay rate of the metastable state on the asymmetric transmission is also discussed.
α Decay Properties of Even-Even Nuclei296–308120 Within the Two-Potential Approach*
Authors: Xu Jun-Yao , Chen Jiu-Long , Deng Jun-Gang , Cheng Jun-Hao , Liu Hong-Ming , Li Xiao-Hua
Published: November 2019

In the present work, we predict the α decay half-lives of unknown even-even nuclei296–308120 within the two-potential approach, whose α decay energy Qα
is calculated using WS3+ mass model. To reduce the deviations between the predictions and experimental data due to nuclear shell effect, the analytic formula of α decay hindrance factor is introduced to the two-potential approach, whose parameters had been extracted from even-even nuclei in the region of 82 < Z ≤ 126 and 152 < N ≤ 184 in our previous work [Deng et al., Chin. Phys. C 42 (2018) 044102]. In addition, for comparing, we use a type of α decay general formula Universal Decay Law (UDL) and a semi-empirical formula in the superheavy nucleus (SEMFLS) to calculate the half-lives of even-even nuclei296–308120. The results indicate that our predicted values and the calculated values of the above two empirical formulas are mutually confirmed. Meanwhile, we systematically study α decay chains of296–308120 and predict the decay modes for superheavy nuclei to help to identify new superheavy isotopes.
Structure, Electronic, and Mechanical Properties of Three Fully Hydrogenation h-BN: Theoretical Investigations*
Authors: Pu Chun-Ying , Lv Lin-Xia , Zhou Da-Wei , Yu Jia-Hui , Tang Xin
Published: November 2019

The structural, electronic, elastic, mechanical properties and stress-strain relationship of chair, boat, and stirrup conformers of fully hydrogenated h-BN (fh-BN) are investigated in this work using the Perdew-Burke-Ernzerhof (PBE) function in the frame of density functional theory. The achieved results for the lattice parameters and band gaps of three conformers in this research are in good accordance with other theoretical results. The band structures of three conformers show that the chair, boat, and stirrup are direct band gap with a band gaps of (3.12, 4.95, and 4.95 eV), respectively. To regulate the band structures of fh-BN, we employ a hybrid functional of Heyd-Scuseria-Ernzerhof (HSE06) calculations and the band gaps are 3.84 (chair), 6.12 (boat), and 6.18 eV (stirrup), respectively. The boat and stirrup fh-BN exhibits varying degrees of mechanical anisotropic properties with respect to the Young’s modulus and Poisson’s ratio, while the chair fh-BN exhibits the mechanical isotropic properties. Furthermore, tensile strains are applied in the armchair and zigzag directions related to tensile deformation of zigzag and armchair nanotubes, respectively. We find that the ultimate strains in zigzag and armchair deformations in stirrup conformer are 0.34 and 0.25, respectively, larger than the strains of zigzag (0.29) and armchair (0.18) deformations in h-BN although h-BN can surstain a surface tension up to the maximum stresses higher than those of three conformers of fh-BN. Furthermore, the band gap energies in three conformers can be modulated effectively with the biaxial tensile strain.
Natural Neighbor Algorithm for Breast Cancer Diagnosis
Authors: Li Shuxiang , Yang Lijun , Chen Peiyu , Yang Cheng
Published: November 2019

Machine learning to diagnose breast cancer is an important, real-world medical problem. As one of the most popular machine learning algorithm, K-Nearest Neighbors (KNN) algorithm is widely used in breast cancer classification and can provide high classification accuracy and effective diagnostic capabilities. However, selection of parameter K is still an unsolved problem for K-Nearest Neighbors (KNN). To address the problem, we introduce a novel neighbor form, Natural Neighbor (NaN), which is obtained adaptively by its search algorithm. We firstly use a noise filter, which called edited natural neighbor algorithm (ENaN), to eliminate the noises and global outliers of Wisconsin’s breast cancer prognosis dataset. Then, cleaned data set and natural neighbor algorithm are used to construct a new non parameter diagnostic system. The main advantages of the proposed algorithm are that it does not need any parameters and can maintain high classification accuracy. Experiments show that the classification accuracy of proposed method is similar to the highest classification accuracy obtained by traditional K-Nearest Neighbors algorithm with different K values.
Design and Implementation of the Enterprise Cluster Manager
Authors: Chen Chen , Cheng Ming , Yang Yang
Published: November 2019

A practical cluster manager is designed to fulfill the management requirements of server resources allocation to multi-UE processes and optimize the security, storage and retrieval of big data. Based on the application background of cluster manager, it introduces the structural designs, including frame, database, member node, master node and internal workflow. Meanwhile, it expounds the optimizing processes of cluster manager, including load balance algorithms, emergency processing, partition store of big data and others. Finally, the feasibility of whole schedules is verified by the test data of practical application, providing a reference for the subsequent research on cluster management.
Research on Image Recognition Method Based on Deep Learning
Authors: Jing Luo
Published: November 2019

With the rise of artificial intelligence technology, computer vision, image processing, image recognition, voice recognition and other technologies have gradually entered the public’s vision. This paper focuses on image recognition. This paper discusses the original image acquisition, image information preprocessing, image feature extraction, pattern classification and recognition results. Analyzes VGG-19 network, VGG improved has realized the image quick recognition, studies input and output points, the number of neurons by convolution neural network, and finally concludes that the deep learning method can shorten the training time, improve the identification results, also the requirement for images in the image library is greatly reduced, the demand for hardware is not too high.
Edge Property Based Stream Order Reduce the Performance of Stream Edge Graph Partition
Authors: Ayall T , Duan H , Liu C
Published: November 2019

The graph data is found everywhere in various disciplines, such as in social networks, biological networks, chemical compounds, and computer vision, etc. Currently, the size of graph data has dramatically increased; all disciplines have extracted knowledge from a graph by partitioning and distributing large-scale graph into different clusters using the distributed graph processing system or graph database. However, the graph partitioning has impacted to speed up or slow down the performance of those systems. Even if the stream edge graph partition has shown better partition quality than vertex graph partition for skew degree distribution of a graph and supports big graph partitioning, stream graph edge partitioners are affected by stream orders. In this study, we propose two edge properties based stream order models, TFB(Tree edges First, then Backward edges follow) and BFT(Backward edges First, then Tree edges follow). And study the effect of stream order on stream graph edge partitioners. The results show that TFB and BFT models significantly affect the quality of stream edge partition, except hashing. All algorithms show the best partitioning quality by Random order than other orders, TFB, BFT, BFS(Breadth-First Search), and DFS(Depth-First Search).
Detection of SQL Injection Attacks Based on Improved TFIDF Algorithm
Authors: Li Yingbo , Zhang Bin
Published: November 2019

Detecting SQL injection attacks (SQLIAs) effectively is one of the critical issues to be solved in Web secure fields. Aiming at the problem that the distribution of feature words in the same kind of statements is not considered when using TFIDF algorithm to vectorize the text of SQL statements, a method of detecting SQLIAs based on improved Term Frequency-Inverse Document Frequency (TFIDF) algorithm is proposed. Firstly, TFIDF algorithm is improved based on the distribution of feature words in the same kind of statements. Then, the improved TFIDF (ITFIDF) algorithm is used to vectorize the dataset of SQL statements to increase the feature weight of the SQL statement. Finally, the detection of SQLIAs is carried out based on Support Vector Machine (SVM). The experimental results show that the combination of SVM and ITFIDF has higher accuracy, recall rate and F-score compared with other similar methods. At the same time, the experimental results also show that SVM has better classification performance when dealing with this problem than other machine learning models such as DNN and Decision Tree.
I Workshop on Modeling and Simulation for Science and Engineering
Authors: Giraldo Suarez E , Zuluaga Díaz B , V-Niño E D
Published: November 2019

This proceeding presents the contributions of the participants of the First Workshop on Modeling and Simulation for Science and Engineering (I WMSSE) conducted in the city of Pereira, Colombia, on August 20 and 21, 2019.

The conference was attended by more than 100 participants and received around 30 presentations or posters. The I WMSSE has been contributed with workshops, presentation and posters that aimed to show progress in different fields of research of undergraduate and graduate students as well as research groups, where it involved mathematical and physical modeling in areas of interest such as the dynamic systems model, the control system, process control, energy flow and mechatronic systems, and multidisciplinary sciences.

The scientific program was quite dense, however, the attendees established academic networks among the participants. The program allowed a high level of talks and an adequate environment for scientific dissemination, we thank the organizers and hosts of the Universidad Tecnológica de Pereira, Colombia, for the event and promote the space to develop the conferences. We also want to thank the members of the organizing committee, as well as the members of the scientific committee.

List of Organizing Committee, International Committee, National Committees, Logos are available in the pdf
Analysis of chaotic systems, an implementation of the logistic equation
Authors: Cárdenas A P P , González G J , Correa V G
Published: November 2019

This paper presents a simple example of a chaotic system, the denomination logistic equation, to illustrate and emphasize the distinctive characteristics of chaos, which are the extreme dependence on initial conditions and complexity of behavior.
Mathematical analysis of an epidemic through qualitative analysis with a third order model
Authors: Devia Narváez D , Devia Narváez D , Ospina R
Published: November 2019

The present article exposes the analysis of the dynamic model of an epidemic, which from certain considerations pretends to present the way in which for a given population the dispersion of a virus can occur, initially the preliminary concepts of the theory are exposed of dynamic systems to then incur the qualitative solution forms of greatest use in the specialized literature, finally the third order dynamic model of the epidemic is exposed, where the considerations and analysis procedures to obtain the final results are shown.
Optimal power flow solution in direct current grids using Sine-Cosine algorithm
Authors: Giraldo J A , Montoya O D , Grisales-Noreña L F , Gil-González W , Holguín M
Published: November 2019

In the next years, Colombian power system will have the connection of distributed generators and constant power loads; Therefore, it is necessary to propose the analysis methods that allow establishing the minimum requirements that have to be satisfied for the power system to guarantee an optimal power flow in order to preserve safe and reliable operation of it. For this purpose, in this paper presents an optimal power flow in direct current resistive grids with constant power loads and distributed generators. The optimal power flow problem is formulated as a master-slave optimization algorithm. The master stage covers the dispatching of all the distributed generators by using the Sine-Cosine algorithm. In the slave stage an efficient power flow method based on successive approximations is employed to determine the voltage variables and evaluate the objective function of the problem, which corresponds to the power loss minimization. A direct current distribution network composed by 21 nodes is used as test case by comparing its numerical performance with nonlinear optimization packages and two metaheuristic approaches named black-hole optimization and continuous genetic algorithm. All the simulations are conducted via MATLAB software.
Volumetric quantification in ovarian pathology using abdomino-pelvic computed tomography
Authors: Valbuena O , Vera M I , Vera M , Gelvez-Almeida E , Huérfano Y , Borrero M , Salazar-Torres J , Salazar W
Published: November 2019

Pathological ovary is categorized into cystic tumors, solid tumors and mixed, according to the content of the affected ovary. Accordingly, the degree of benignity or malignity thereof is established. The imaging study for the preliminary morphological assessment of PO is ultrasound, in its pelvic and transvaginal modalities, for which well-established criteria are available. Once the ultrasound findings suggest malignancy, complementary studies such as abdominal-pelvic tomography images and tumor markers are requested. This type of images has challenging problems called noise, artifacts and low contrast. In this paper, in order to address these problems, a computational technique is proposed to characterize a pathological ovary. To do this, a thresholding and the median and gradient magnitude filters are applied, preliminarily, to complete the preprocessing stage. Then, during the segmentation, the algorithm of region growing is used to extract the three-dimensional morphology of the pathological ovary. Using this morphology, the volume of the pathological ovary is calculated and it allows selecting the surgical-medical behavior to approach this kind of ovary. The validation of the proposed technique indicates that the results are promising. This technique can be useful in the detection and monitoring the diseases linked to pathological ovary.
The experimental chemical hardness in the interaction between β-tubulin and epothilone B
Authors: Corzo S P , Bueno P R , Miranda D A
Published: November 2019

We showed the use of the experimental chemical hardness in the analysis of the interaction between β-tubulin and epothilone B. The interaction is analyzed by exposing the Epothilone B to a sensor based on an organic self-assembled monolayer functionalized with Beta tubulin. The proposed methodology is nondestructive and label-free. It allows us to compare the interaction between Beta-tubulin and different concentrations of the pharmacological molecule, i.e., epothilone B. The interaction is analyzed by the experimental hardness obtained according to the Miranda-Bueno methodology. We observed a linear behavior between the logarithm of the chemical hardness and the logarithm of epothilone B concentration. The results suggest the experimental chemical hardness can be used to compare the interaction of β-tubulin with epothilone B and with other pharmacological molecules.
Impact of the adoption of corporate governance practices on the performance of information technology projects
Authors: Castro Silva H F , Velásquez-Pérez T , Quijano Brand L F
Published: November 2019

This work illustrates the use of tools that allow linking project objectives with the vision and strategy of the organization, monitoring effectiveness and controlling the development of activities, to improve project results. One of these tools is precisely the balanced scorecard, which contemplates additional strategic dimensions to the traditional ones in the field of project management, known as the triple constraint (time, scope and cost). This research paper analyzes the impact of the use of the balanced scorecard in the management of information technology projects in Colombia. The results obtained are presented when comparing projects developed with different monitoring and control methodologies, for projects that have implemented the balanced scorecard including strategic measurement dimensions. The study involved 105 project managers. The results of the study provide empirical evidence that concludes that the balanced score card is a tool that improves the effectiveness and efficiency of project management. In addition, the results show that the balanced score card improves the effectively achieves alignment of the with the organization’s strategy.
Optimization of the allocation of academic schedules through artificial intelligence techniques
Authors: Velasquez A M , Velásquez-Pérez T , Puentes A M
Published: November 2019

The programming or assignment of academic schedules in educational institutions has become an important global problem, this is due to the fact that it implies great efforts in time and resources for the staff a burden of this task due to the amount of restrictions and conditions that exist properly involved from the institution. Based on this problem and considering that common algorithms do not offer an optimal solution in this situation, it is necessary to resort to artificial intelligence techniques because they offer methods and algorithms that reduce the time and resources needed to generate an optimal program. This document details different artificial intelligence techniques used for the allocation of schedules, in order to find the technique that best suits the needs of the institution under study Universidad Francisco de Paula Santander, Ocaña located in Colombia, and which will be implemented more forward as a possible solution for the allocation of academic schedules in the institution.
National security clause: law and practice of European Union and Eurasia Economic Union
Authors: Slepak Vitaliy
Published: November 2019

Objective of strengthening scientific and technological bases within international organisation implies common framework conditions and access to finance for research and innovation all over the territory of Member States in order to ensure that innovative ideas can be turned into products and services. It could be specific area with its own regulation supplementing the rules on common (internal) market as in the European Union or free movement of scientific information, research results (including the results having market value) could be guaranteed by common provisions for common market, common competition policy etc. as in Eurasia Economic Union. However, states often close their research and development markets for foreign participants in order to secure national interests. General approach to the issues of national security may be described with the following formula: in each specific case the Member State must demonstrate the presence of real and serious threat that touches one of its fundamental interests that could be regarded as more important issues than European integration issues, the derogations deal with exceptional and clearly defined cases and do not provide an inherent general exception, and, like any other derogations from fundamental freedoms, shall be interpreted restrictively.
Megascience projects financing in the territory of Russia
Authors: Arzumanova L L , Boltinova O V
Published: November 2019

The work describes the existing in the Russian Federation the system of financing projects megascience. By the example of legislative regulation, the authors analyze the current situation of these projects and the prospects for their further development. The foregoing allows acknowledging that legal control basis on regulation of megascience projects exists in the Russian Federation. The research was accomplished with financial support of the Russian Fundamental Research Fund in the framework of scientific project № 18-29-15036 mk «Models of legal regulation of unique scientific facilities of megascience class in the national and international level in conditions of technological development of the Russian Federation».
The ALICE Experiment, NRNU MEPHI a Two-way Road
Authors: Grigoryev V A , Kaplin V A
Published: November 2019

ALICE is one of four main experiments at the Large Hadron Collider (CERN, Geneva). MEPHI is the member of the ALICE collaboration since 1996 year. Participation of the university professors in the international experiments of the highest level provides for their high scientific and knowledge level and therefore the level of their students and post-graduate students. Thus the students enter into scientific researches quite easily providing for the participation of Russian scientists in a large number of other international experiments.
Mechanism for financing scientific projects of “Megascience” class in Russia
Authors: Sitnik A A
Published: November 2019

This article is dedicated to consideration of legal framework for financing scientific projects of Megascience class in the territory of the Russian Federation in terms of “PIK” reactor and NICA collider. These projects intend new breakthrough research practice aimed at acquiring knowledge important for development of the whole humanity. Successful accomplishment of these projects integrally depends on financing, its sufficiency and promptness. As far as projects of megascience class are first of all aimed at receipt of fundamental knowledge, the leading role for financing is played by public funds contributed in Russia in the framework of state programs. Furthermore it is possible to attract extra-budgetary funds from different sources. It is defined that global character of research practice determines engagement of foreign financing inclusively. Therefore, today megascience projects are accomplished basing on the principle of financing sources multiplicity.
A study on the density and the cover of seagrass species along the West Coast of Natal
Authors: Machrizal R , Khairul K , Chastanti I , Sari N F , Ritonga N , Sepriani Y
Published: November 2019

The objective of the research was to analyze the condition of seagrass ecosystem in the waters of Natal coastal area. The research was conducted from April until July, 2017. The research location was divided into four areas: Pantai Galon, Pantai Sikara-kara, Pantai Buburan, and Pantai Bintuas. The observation on the seagrass was done by using transect quadrate 1m × 1 m with 5 repetitions. The measurement of density and the percentage of the cover was done in each transect. The result of the research showed that there were four seagrass species which grew along the coastline of Natal:Enhalus acoroides, Halophila ovalis, Cymodocea rotundata, andHalodule pinifolia. E. acoroideswas a type of seagrass with the highest density. The highest percentage of seagrass cover in the Buburan coastline area was 89% and the lowest one was in Galon coastal area (51.2%). In general, the condition of seagrass in the waters along the coastal area of Natal is in good/health category. The intensity of light and the velocity of current are the most influencing factor which influences the density and the percentage of seagrass cover along the Natal coastal area.
Analysis of shallow water benthic using of SPOT-6 imagery data on Miang Besar Island, Kutai Timur, Indonesia
Authors: Hamsah K , Azhar S , Ulfah M , Yunita D A
Published: November 2019

Potential observation of coastal waters habitat by an extensive coverage difficult reached by in-situ observation methods, so that using image data is expected to study of data in a short time and broad scope. SPOT-6 satellite multispectral imagery as imagery data was used in this study to interpret habitat conditions spatially. Research was conducted on Miang Besar Island, East Kutai by imagery data processing and field survey. Field surveys in shallow waters to observe the appearance of coral objects, seagrass, and mangroves. Imagery data processing stages by radiometric and geometric correction and transformation of lyzenga algorithm by supervised classification methods. The classification results in 3 community schemes namely; coral, seagrass and mangrove on coastal of Miang Besar island showed a presentation of mangrove communities distribution area 29.000 m2 and percentage cover 54% by Rhizopora apiculata, Seagrass community distribution area 8,900 m2 and percentage cover 76% by Enhalus acorides, and coral community distribution area 5,800 m2 and percentage cover 62% by Hard coral.
Growth pattern, reproduction and food habit of palau fish Osteochilus vittatus in Batanghari River, Jambi Province, Indonesia
Authors: Kaban S , Armanto M E , Ridho M R , Hariani P L , Utomo A D
Published: November 2019

Batanghari River is one of the fishing locations in Jambi Province, Indonesia. One of the commercial freshwater fish in this river is silver shark minnow Osteochilus vittatus. Presently, there was no study on the bioecology of this species in Batanghari river. Therefore, the aims of this research were to analyze the growth pattern, reproduction, and food habits of silver shark minnow in Batanghari River, Indonesia. Data were collected in February, April, June, September, and October 2018. The samples were preserved with alcohol 70%. The length-weight relationships were analyzed using the linear allometric model, gonad maturity was observed by morphologically, and fecundity was calculated by the gravimetric method. The results showed that this fish had an isometric growth pattern. The fish fed on phytoplankton and indicated as herbivorous plankton feeder. Bacillariophyceae and Chlorophyceae were predominant food items. The fish spawn around the year partially with fecundity between 2,726 - 19,202 eggs. The gonad maturity index ranges from 5.38% to 11.44%, and the egg diameter ranged from 0.40 to 1.27 mm.
Fish biodiversity in false gharial habitat (Tomistoma schlegelii Müller, 1838) in Labuhan Batu district
Authors: Hariyadi I , Machrizal R , Dimenta R H , Khairul K , Hasibuan R , Gultom H S B
Published: November 2019

The purpose of this research was to determine the fish biodiversity in the False Gharial (Tomistoma schlegelii) habitat at Aek Kundur, Labuhanbatu District. This research was conducted from February to April 2019. The sampling locations was determined based on information from local people. Fish samples were caught using gillnets, fishing rods, and durung (trap). The sampling was done one time every month for three months at three sampling stations. The diversity index (H'), Evenness index (J') and similarity index (SI) were analyzed in this study. The results showed that the highest number of fish caught was Anumalura oxygaster (188 individuals) and the lowest number of fish was Monopterus albus (1 individual). The highest diversity index (H') value was at station 1 (2.224) and the lowest at station 2 (2.202) categorized as medium level. The evenness index value at station 1 was 0.867, station 2 was 0.856 and station 3 was 0.826, indicate the high evenness. While the highest Similarity Index (SI) was found at stations 3 and 1 (90%) and the lowest SI was recorded at stations 2 and 3 (80%). It is concluded that the diversity index value in Aek Kundur is categorized as medium level. The Evennes index value is categorized as high uniformity of population, and the fish community was in stable condition.
Population dynamics of the Groe fish Barbodes binotatus (Pisces: Cyprinidae) in the Nagan River, Aceh Province, Indonesia
Authors: Batubara A S , Nur F M , Zulfahmi I , Rizal S , Efizon D , Elvyra R , Muchlisin Z A
Published: November 2019

The assessment of population dynamics of the groe fish Barbodes binotatus has never been performed, this species is one of the commercial freshwater fish in Aceh province and one of the main target for fishing by local fishermen. Hence, the objective of this study was to analyze the population dynamics of the groe fish B. binotatus in Nagan River, Nagan Raya District, Aceh Province, Indonesia. The survey was conducted from January to December 2016. A total of 409 fish samples were collected. The von Bertalanffy (von Bertalanffy growth function) growth parameters were utilized to analyze the population dynamics of B. binotatus using FAO-ICLARM Stock Assessment Tools-II (FISAT II). The results showed that the population dynamics of asymptotic length (L∞) was 130.88 mm, coefficient of growth (K) was 0.70 year-1, growth performance index (Ø) was 4.08 year-1, time at which length equals zero (t0) was -0.014 year-1 and the optimum length of catch (Lopt) was 90.11 mm. In addition, the total mortality rate (Z) was 1.62 year-1 with natural mortality rate (M) = 0.95 year-1, fishing mortality rate (F) = 0.67 year-1, and exploitation rate (E) = 0.41 year-1. In conclusion that based on E value analysis displays that the exploitation rate of B. binotatus has not yet exceeded the sustainable limit based on the value of L∞, K, t0, Lt, Lopt of dominant >1 years old fishes caught.
Toluene–degrading activity of local bacteria isolated from contaminated sea of North Sumatera
Authors: Lestari W , Priyani N , Munir E , Hartanto A , Warsito K
Published: November 2019

Hydrocarbon contamination in soil and water is still a major concern and considered as a serious environmental issue to various natural habitats. Microbial degradation of hydrocarbon compounds is considered as one of eco-friendly method to overcome this issue of contamination. Toulene-degrading bacteria were successfully recovered from contaminated marine seawater of Belawan and Tanjung Balai, North Sumatera. Three bacterial isolates identified as Pseudomonas aeruginosa TJB01, Pseudomonas sp. TJB05, and Acinetobacter sp. SBG05 were subjected to degradation test by evaluating their hydrocarbon-degrading activities towards Toluene as one of selected hydrocarbon compounds of BTEX. Parameters observed in this study were bacterial cell density (Colony-forming unit/mL) by using Total Plate Count method and hydrocarbon residues (ppm) quantified by using Gas Chromatography. Initial concentration of Toluene was detected 173.10 ppm. Isolate P. aeruginosa TJB01 produced the highest cell density (log 7.94 CFU.mL−1) and produced the highest toluence degradation (%) at 59.46% than other isolates and bacterial consortium during 12 days of incubation period. Further investigations are needed to optimize consortium potential in exhibiting better degradation activities.
Community structure of macrozoobenthos in Lamnyong River, Aceh Province
Authors: Octavina C , Dewiyanti I , Nurfadillah N , Ulfah M , Razi N M , Sakinah R , Agustiar M
Published: November 2019

The purpose of this research was to determine the community structure of macrozoobenthos in the last three years (2017, 2018, and 2019) through analysis of diversity index, evenness index, dominance index, and density. The research was conducted On March 2017, April 2018, and March 2019 in the Lamnyong River. This research used purposive random sampling method, which consisted of 3 stations based on the width of the river namely the right, middle, and left edges of the Lamnyong River. The results showed that during the last three years, 2017, 2018, and 2019, the community structure of macrozoobenthos in the Lamnyong River was classified as unstable because of the dominance of several macrozoobenthos species, but the quality of the river waters could still be tolerated by macrozoobenthos. The types of benthos was found in the Lamnyong River in 2017 is 3 families of macrozoobenthos namely Anomidae, Mytilidae, and Mactridae. In 2018, was found 5 species of macrozoobenthos which Tellina palatam, Lopha cristagali, Scylla serrata, Pinna bicolor, and Balanus sp., and in 2019 there was found 1 species of macrozoobenthos, namely Mactra luzonica.
Composition of brachyura cryptic organism (crustacea) on the dead coral of Pocillopora in Sabang
Authors: Ulfah M , Tawakkal M , Devira C N , Nurfadillah N , Mellisa S , Sembiring A , Kurniasih Ambariyanto E M , Meyer C
Published: November 2019

The purpose of this study to evaluate the environmental conditions of Brachyura cryptic organism (class Crustacea) composition from genus Pocillopora found on dead corals of Sabang waters. The method used in this research by Purposive Sampling. The data were collected in August 2016 at three observation stations: Seulako Island, Rubiah Island, and Sumur Tiga. The number of the station were categorized as deep waters (7-10 m) which have different types and substrate characters. The results of water quality showed the temperature (30°C), salinity (29.5‰ - 32‰), and pH (7). Furthermore, there were five families found (Xanthidae, Portunidae, Majoidea, Pilumnidae and Trapeziidae) with a total of 142 individuals that spread into three stations. The most common individual was found in Seulako Island with the dead coral volume of 3.2 liters, while the least was found at the site of Sumur Tiga with the dead coral volume of 1.2 liters. The range of dead coral volume which was found at the Seulako Island, Rubiah Island and Sumur Tiga were 1.2 - 3.2 liters.
The composition of coral reefs in Ulee Lheue breakwater, Banda Aceh, Aceh, Indonesia
Authors: Fadli N , Muchlisin Z A , Pratama F O , Mustari T R , Dewiyanti I , Purnawan S , El-Rahimi S A , Sofyan H , Affan M , Siti-Azizah M N
Published: November 2019

The present study was aimed to catalog the coral reefs that are found in Ulee Lheue breakwater, and providing a baseline data that will be valuable in Aceh marine conservation plan in the future. The research was conducted from February to October 2015. The station of observations was designed by systematic sampling. The sampling stations were located on the outer side and inner side the breakwater with a station spacing of 250 m. Furthermore, 50 m roll meter was used in each station as the reference to laying squares transects (size 100 × 100 cm) for coral reefs observation. Then, the square transects placed on 0, 5, 10, 15, 20, 25, 30, 35, 40, 45 and 50 m. The results showed the reef at the outer breakwater consists of 11 coral genus of 244 colonies. While on the inner side of the breakwater, eightgenera of 46 colonies were observed. Acropora and Pocillopora were the most common genus on the outer side of the breakwater, while Chypastrea and Porites were the most common on the inner side. 0-5 cm coral colony size was the most common size found on both sides of the breakwater. This result showed that the construction of artificial structures on the coast is not only important in the development of a city but also important for marine biology and ecology study.
Length-weight relationship and condition factors of layang fish (Decapterus macrosoma) that landed at Lampulo Ocean Fishing Port, Banda Aceh
Authors: Afdhila R , Muhammadar A A , Chaliluddin M A
Published: November 2019

Length-weight relationship and condition factors in biological fisheries are one of the complementary information that needs to be known in relation to fisheries resource management. This research aims to know the growth pattern and condition factors of Layang fish (Decapterus macrosoma) that caught in Aceh’s province water. The sampling used simple random sampling method conducted from February to March 2019. The sample is the catch of fishermen from the Aceh’s water area that landed at Lampulo Ocean Fishing Port. The Data were analyzed by Linear Allometric Model (LAM), relative weight and Fulton’s condition factors. The results showed that layang fish (Decapterus macrosoma)had a negative allometric growth pattern with a value of b = 2,61. The value of 103,46 from the relative weight conditions factor indicates a stable water condition and the value of 3,00 from the factor of Fulton’s conditions allows the availability of abundant food that support the life of Decapterus macrosomafish well.
Diversity and abundance of periphyton in the seagrass ecosystem Pulau Matahari, Pulau Banyak Aceh Singkil
Authors: Nurfadillah N , Dewiyanti I , Husna A , Ulfah M
Published: November 2019

Periphyton has a high primary productivity that enhances the primary productivity of seagrass ecosystem through food web. The objective of this study was to analyse the diversity and abundance of periphyton on seagrass leaf of Pulau Matahari, Pulau Banyak Aceh Singkil District. The research was conducted at four stations with five repetitions in August 2014. Samples of periphyton were collected by scrapping the surface of seagrass leaf with the swept area 5cm x 5cm. Samples were identified using the field of view method at Marine Biology Laboratory, Syiah Kuala University. Result of the research was found that the index values of diversity (H’) ranged from 0.85 − 1.94 (low). Abundance of periphyton ranged from 234.556 − 879.585 ind/cm2, it was found 22 species of periphyton belonged to class of Bacillariophyceae, Chlorophyceae, Rhodophyceae, Rotatoria dan Crustaceae. The highest abundance of periphyton belonged to class Bacillariophyceae (361607 ind/cm2), while the dominant species was Synedra sp. (55%).
The assessment of wood utilization rate at UD. Karya Lomba Shipyard, Aceh Besar, Indonesia
Authors: Thaib R , Lubis R Z , Rusydi I , Chaliluddin C , Affan J M , Putra D F , Yusrizal Y
Published: November 2019

This research aims to analyze the wood utilization rate at the manufacture of the vessel’s frames in UD. Karya Lomba shipyard, Lamteh Village, Peukan Bada subdistrict, Aceh Besar. The study was carried out in March to April 2018 by observing several parameters such as type of wood used, the process of vessel frames making and the utilization level of wood including initial wood volume, the volume of wood used and the volume of unused wood. The descriptive method was done by comparing the volume of wood used with the early wood volume and the volume of unused wood with wood scratch. Vessel’s frames from two under construction vessels were used as the study object by the length of 7.10 m, 13 frames and made from Jackfruit wood (Artocarpus heterophyllus). Then the length of the vessel II with 15.50 m, 35 frames and made from Laban wood (Vitex pubesceus). The results showed that the wood utilization rate for frames manufacturing on the ship I reached 38% and 60% of the vessel II reached 60% respectively.