bluuebunny/crossref_metadata_2025_split huggingface dataset:
The potential of derivatives of organotin(IV) benzoate compounds in medicinal chemistry
Authors: Samsuar  , Simanjuntak Wasinton , Qudus Hardoko Insan , Hadi Sutopo 
Published: October 2019

Abstract
This paper deals with short review about the application of organotin(IV) compounds. The discovery of bacterial resistance to antibiotics drew the attention of chemists to discover new types of chemical compounds that have the antibacterial activity to overcome the resistance. Increased antibiotic resistance is a consequence of the evolution and adaptation of microbes, caused by excessive anthropogenic antibiotic consumption. Increased cases of bacterial resistance will be a bigger problem if not treated with the discovery of new antibiotics. The discovery of medicinal chemicals may contribute to the advancement of treatment, especially antibiotic resistant. Organotin(IV) compounds are part of organometallic compounds that have been studied their pharmacological effects on several types of bacteria. The derivatives of organotin(IV) benzoate compounds proven to have biological activity against some types of bacteria. The type and structure of the ligand in the compound derivative of organotin(IV) benzoate gives the influence of different biological activity against bacteria.
The Deposition of Silver (Ag) on a Glass Substrate (Sio2) using Direct Current Sputtering Method
Authors: Rumiyanti L , Ginting E S B , Aziz I , Sembiring S , Warsito  
Published: October 2019

Abstract
The research’s aims are to calculate the absorbance and the thickness value of the silver (Ag) thin layer formed on the glass substrate (SiO2) at various visible wavelengths. The silver (Ag) thin layer was formed using Direct Current Sputtering method. The research showed that the highest absorbance value on the glass (SiO2) substrate was 4.000 with wavelengths 287.50 nm. While, the lowest absorbance value on the glass (SiO2) substrate was -4.000 with wavelengths 262.50 nm and 243 nm. The lowest absorbance value is estimated because of the part of the substrate that has not been completely coated so that the part is not absorbed at all. Using Swanepoel equation we obtained the thickness value of the thin layer equal to 4.692663316 nm with sputtering time of 15 minutes.
Measuring of Cassava Starch Content by Using Strain Gauge
Authors: Surtono A , Aprilliana P , Supriyanto A , Pauzi G A , Junaidi  , Suciyati S W , Warsito  
Published: October 2019

Abstract
It has been realized an instrument for measuring cassava starch content digitally based on specific gravity method. The instrument is designed using strain gauge, which packing in load cell as a mass sensor, HX711 (Analog to Digital Converter), Arduino Uno as a data processor, LCD, and personal computer. The principles of this instrument are using specific gravity method, which is based on differences of cassava mass in the air and the water. Cassava starch content calculated by Arduino using Sungzikaw equation and displayed in LCD screen. The result showed that the instrument capable measure cassava starch content with the maximum capacity of 2,0 kg and average percentage error of less than 1,5 %.
Smart Patrol as Monitoring System In Resort Way Nipah Bukit Barisan Selatan National Park
Authors: Efendi A A , Fitria E , Haryanto S P , Charles Y , Rustiati E L 
Published: October 2019

Abstract
SMART is new aplication developed to measure, evaluate, an improve effectivity of monitoring and activity of conservation based of location. The research be held on march-april 2018, in Resort Way Nipah Bukit Barisan Selatan National Park (BBSNP), under program and collaboration with WWF-Indonesia Southern Sumatran Program. This research to understand effort security conservation area with SMART Patrol in Resort Way Nipah Bukit Barisan Selatan National Park. In this research use data patrol period July 2015-July 2017 as discussion material. Data devided into some groups (data series) consists of 4 groups is group 1 (period patrol September-December 2015), group 2 (period patrol March-June 2016), group 3 (period patrol September-December 2016) and group 4 (period patrol March-June 2017). High threat findings in period patrol March-June 2016 and 2017, while low threat findings in period patrol September-Desember 2015 and 2016. Wild animal findings increased in 3 first period and decreased in fourth period. Resort Way Nipah had over land function as plantation of coffee (Coffea sp), cocoa (Theobroma cacao), peper (Piper nigrum) and banana (Musa paradisiaca). Has been identified 25 species wild animal findings in Resort Way Nipah based on direct findings and indirect findings. Based on 25 species wild animal has identified, divided based on conservation status is Least Concern (9 species) Near Threatnes (4 species) Vulnerable (4 species) Endangered (5 species) and Critically Endangered (3 species).
Cytotoxic Activity Assay of N-Hexane Extract of Solanum nigrum L. Fruits Fermented by Kombucha against MCF-7 Breast Cancer Cell Line
Authors: Ziska R , Agustina A , Supriadi  
Published: October 2019

Abstract
Background: Breast cancer is the second leading cause of cancer-related deaths among women worldwide. Anticancer drugs therapy cause unwanted side effects problems that occur when treatment affects healthy tissues or organs. It is quite essential to find potential herbal as alternative cancer treatments. Glycoalkaloid (β2-solanin), solamargin, solasodine, dan solasonin of Solanum nigrum L. are potentially inhibit proliferation of leukemia and tumor cell: hepatic, intestinal, breast and cervic. On the other hand, kombucha as symbiotic culture of bacteria and yeast (SCOBY) has ability to increase activity of substrate by fermentation process. Objective: To determine cytotoxicity activity of n-hexane fruits extract of Solanum nigrum L. against MCF-7 breast cancer cell line after fermented by kombucha. Method: n-hexane fruits extract of Solanum nigrum L. was fermented for eight days at 25 ºC with 20% of combucha and addition of 20% of sucrose. Citotoxic activity was performed by using MTT(3-(4,5-dimethyltiazole-2-yl)-2,5-diphenyltetrazolium bromide) assay. Phytochemical of n-hexane extract was analyzed by GC-MS. Total acid and total phenol were characterized quantitatively. Results: IC50 of n-hexane fruits extract and fermentation product were 544,30 ppm and 1386,39 ppm, respectively. Flavonoids and steroids were identified from the extract and GC-MS shown seven compounds have been extracted from n-hexane fraction. Conclusion: condition of kombucha fermentation required optimization to improve cytotoxic activity of n-hexane fruits extract of Solanum nigrum L. against MCF-7 breast cancer cell line.
The Implementationof Digital Text Coding Algorithm Through A Three Dimensional Mapping Derived From Generalized ΔΔ-mKdV Equation Using Mathematica
Authors: Notiragayu  , Zakaria L 
Published: October 2019

AbstractEncryption-decryption algorithm using a mapping can be done for encoding a digital text, such as two dimensional mapping ΔΔ-sine Gordon equation. In this article, we will be given an encryption-decryption algorithm to a digital text through a three dimensional mapping that derived from the generalized ΔΔ-mKdV equation. Implementation of Encryption-decryption algorithm in this article using MATHEMATICA.
Ethnomathematics batik design Bali island
Authors: Irawan A , Lestari M , Rahayu W , Wulan R 
Published: October 2019

Abstract
Aims of this study is to make an application to detect Balinese batik that has an etnomatematics elements using backpropagation method and to observe etnomatematics elements on Balinese batik. This study using qualitative descriptive methods with ethnographical approach, literature study, and expert study on etnomatematics issues. This paper shows that in typical Balinese batik there are several elements in the transformation of mathematics that are translation, reflection, rotation, while in other batik shows dilation elements In addition from the ethnography there are elements of spiritual and distinctiveness of the Balinese society that upholds local culture values.
Analysis of Internet Service Quality Using Internet Control Message Protocol
Authors: Hafiz A , Susianto D 
Published: October 2019

Abstract
Quality measurement needs to be done to determine the level of quality possessed by the system. Quality of Service is a measurement method issued by the European Telecommunications Standard Institute (ETSI). All activities at AMIK DCC utilize internet facilities, such as teaching and learning activities, administrative activities, student unit activities, and libraries. Because to support all these activities need a good and reliable of network. Some students complained about the lack of satisfaction of the internet network on campus. this research will analyze the Quality of Service internet network both wired or wireless in AMIK DCC Building by using Internet Control Message Protocol (ICMP). The data obtained will then be processed for analyzed throughput, packet loss, delay, and jitter to know how the quality of internet services. Based on the measurement, the results obtained that the throughputis 79%, the packet loss under 5%, the delay is below 175 ms and the jitter at 1%. From the results of research, it can be concluded that the Quality Of Service internet network in AMIK DCC included in the category satisfactory by TIPHON standards, but need to add repeaters to defeat the Internet network coverage for every floor and room.
Assessment of Science Teacher Competence in Teaching Secondary Science with Spiral Progression Approach
Authors: Maing Emily M. , Mangadang Almaira T. , Salic-Hairulla Monera A. , Canalita Everlita E. , Sequente Fernando R. , Yuenyong Chokchai 
Published: October 2019

Abstract
This study aimed to assess the competence of science teacher in teaching secondary science with spiral progression approach in terms of their knowledge on subject matter, teaching strategies, personality traits and teaching approach. Science teachers in both public and private schools within Lanao del Sur and Lanao del Norte served as the respondents of this study. The study used questionnaire as methodology and utilized the frequency distribution, correlation coefficient and regression analysis method. The result showed that the profile of the respondents specifically age, tenure and year in teaching science, and salary grade are correlated with science teacher’s competence in knowledge of subject matter. The result also showed that aside from age and tenure rank or position of the respondents is also correlated with the teaching strategies. Length of service correlates only with the personality traits of the respondents. Civil status, years in teaching, highest educational attainment correlates with the respondents teaching approach.
Magnet and Pin kit: Connection Symbolic and Submicroscopic Representations of Lewis dot structure and Molecular geometry
Authors: Kamkhou Phalakorn , Yuenyoung Chokchai 
Published: October 2019

Abstract
This work aims to connect the symbolic and submicroscopic representations of covalent compound’s Lewis dot structure and molecular geometry by using the Magnetic and Pin kit (MP-kit), which was constructed from magnets and pins. The MP-kit was created to facilitate the students. The kit has two sets, the first set, called Magnet set, consists of a 30x30 cm iron plate, an alphabet A with magnet (refer to central atom), 6 alphabets B with magnet (refer to surrounding atom), 18 white circular magnets (refer to valence electron of A), 42 black circular magnets (refer to valence electron of B) and 3 yellow circular magnets (refer to extra electron of molecule, from ion generation). Which was used to create the Lewis dot structure of covalent molecules. The second set, called Pin set, consists of a spherical eraser (refer to central atom), 6 pins (refer to bond and surrounding atom) and 3 droplet pins (refer to lone pair electron of central atom). Which was used to make the molecular geometry of covalent compounds, that predicted by using VSEPR theory. The users can use the Magnet set to create the Lewis dot structure without frequent drawing and rubbing on the papers. The magnets on the plate are moved for anytime when the users know it’s wrong. Moreover, this set can be used to show the number of bond pair electrons, types of bond and number of lone pair electrons on central atom. The Pin set is used to build the 3D molecular structure and specify the bond angles. The kit was used to link the symbolic and submicroscopic representations and encourage the student’s understanding. Finally, the teacher can use the MP-kit to check the student’s misconception, leading to solve problems immediately.
Challenges of implementing Lesson Study in Cambodia: Mathematics and Science Teaching by using Lesson Study at Happy Chandara School
Authors: Kim Visa , Douch Makara , Thy Savrin , Yuenyong Chokchai , Thinwiangthong Sampan 
Published: October 2019

Abstract
This study diagnoses the challenges of implementing Lesson Study (LS) in teaching mathematics and science at the junior high school and the senior high school of Happy Chandara School (HCS), Cambodia. This action research was selected during July 2017 to July 2018. The study seeks to answer two main questions: 1) what are the advantages of implementing LS? 2) What are the challenges of implementing LS? To collect the data, we carried out 5 steps: classroom observation, assessments of pedagogical content knowledge (PCK), surveys of teachers and school directors, introducing LS, and implementing LS. As the result, it found that LS helped teachers: to clarify the level of learning outcomes to which the instruction should be directed; to make a qualified lesson plan (it is not individual work); to become more cooperative to improve their teaching and students’ learning; and to build up the professional capacity among the group work of their colleagues with the same subject. Furthermore it sheds light on content and instruction, instructional support systems, the implementation of teacher standards, and time management as the challenges.
Formulating Refreshment Drink Activity Utilizing STEM Education for Grade 8 Learners
Authors: Guarin Rica Mae , Buan Amelia T. , Malicoban Elesar , Barquilla Manuel B. , Yuenyong Chokchai 
Published: October 2019

Abstract
This article is a qualitative study using literature review to create a lesson plan in STEM education. The lesson plan employs the pedagogy of purposeful design and inquiry. This proposes combining elements of design, art, geography and marketing into the disciplines in scientific inquiry of the STEM education in order to further strengthen it. The embedded lesson plan focused on identifying and solving social issues while hitting as many as possible learning competencies along the way. This lesson plan will serve as a contextualize application of learning competencies in Grade 8 Integrated science: biology, chemistry and physics as well as mathematics’ topic on statistics and social sciences’ topic on local geography. This study also include innovation and humanities so students learn skills such as communication, marketing and entrepreneurship. This will also be implemented with the goal of steering students’ interests towards a career in STEM and developing more 21st century as well as life skills that they can use in the future. The student activity in this lesson plan will be assisted and evaluated by the teacher through questions that are framed to encourage deep thinking about the concepts integrated in the activity and how it would be used to produce quality product that would solve the social issue presented at the beginning of the lesson.
Indonesian Students’ Attitude and Interest in STEM: An Outlook on The Gender Stereotypes in The STEM Field
Authors: Suwono Hadi , Fachrunnisa Rifka , Yuenyong Chokchai , Hapsari Linda 
Published: October 2019

Abstract
STEM education could be reckoned as a noble thing in the Indonesian Educational System in the last few years. This paper is a preliminary attempt to investigate the students’ attitude and interest in STEM regarding the gender perspective of Senior High School’s student in Malang, Indonesia. To explore the attitude and interest in the gender stereotypes, this quantitative method study has been conducted. 357 students participated in the survey which comprised 126 males and 231 females. The survey contended 40 items of belief’s indicators in the STEM field such as science, technology, engineering, mathematics and the STEM. Besides, at the end of the survey’s section, there are some options for future study programs and career to be selected by the learner. Unexpectedly, the finding of this project revealed that male has a more positive belief in the most of STEM field, such as technology, engineering, mathematics, and STEM, rather than female. In comparison, the female has a more positive belief than male in the science only. The marked investigation of emerging from the data comparison was both of male and female have a higher interest in the social field and medicine. However, the additional interest of male and female was significantly different. In males, we found that they have more interest in engineering, while females have an interest in biology. This study also disclosed that the factors, namely family support, family financial, friends, teachers, and hobby, determined both attitude and interest in STEM among students in Malang.
Examine Students’ Perception on Their Critical Thinking and Problem-Solving Ability through Journal Writing for Learning about Genetics and DNA Technology
Authors: Wongsila Saranya , Yuenyong Chokchai 
Published: October 2019

Abstract
This study examined grade 12 students’ perception on their critical thinking and problem-solving ability when they participated in the STS genetics and DNA technology unit. The participants were 43 grade 12 students in Maung, Khon Kaen, Thailand. The STS genetics and DNA technology unit were provided learning activities through STS approach in framework of Yuenyong (2006) and has been taught by the first author for 3 weeks. Methodology regarded interpretive paradigm. Students’ perception on their critical thinking and problem-solving ability were interpreted through their reflection as journal writing for their learning about genetics and DNA technology. Students’ journal writing was collected after each class of the STS genetics and DNA technology unit was done. The findings revealed that students perceived on their critical thinking and problem-solving ability when they wrote their journals to reflect what they learned. These reflections provided 4 elements of critical thinking and problem-solving ability. These included reason effectively, used systems thinking, make judgment and decisions, and solve problem. These finding would be a good practices for teaching biology through STS approach to who may take further applications for science teaching and learning.
Ice Cream STEM Education Learning Activity: Inquiry from the Context
Authors: Villaruz Eileen J. , Cardona Maria Cindy F. , Buan Amelia T. , Barquilla Manuel B. , Yuenyong Chokchai 
Published: October 2019

Abstract
The paper will clarify the ice cream making STEM education learning activities which provide through Sutaphan nad Yuenyong [11] context based STEM education learning approach. This approach consists of 7 stages including (1) Identification of social issues, (2) Identification of potential solution, (3) Need for knowledge, (4) Decision-making, (5) Development of prototype or product, (6) Test and evaluation of the solution, and (7) Socialization and completion decision stage. Icecream STEM Education Learning Activity will bring students to practice integrated knowledge among chemistry, mathematics, art, and economics in order to design their products of icecream. This may has implication for organizing STEM education in school setting.
The Influence of vocabulary mastery and reading comprehension towards performance of students in mathematics
Authors: Virgana V , Lapasau M 
Published: October 2019

Abstract
This study aims to find out about the influence of the vocabulary mastery and reading comprehension towards students’ mathematicals performance in PISA, either directly or indirectly. This research uses survey method with a quantitative approach and path analysis as a research design. The respondents are 70 students of Junior High School in Jakarta. Data collection is done through research instrument in the form of tasks about vocabulary and reading comprehension, while the mathematical questions about Space and Shape are taken from PISA 2015. The results of the analysis shows that there are: direct influence of vocabulary mastery towards students’ performance in mastering mathematical problems in PISA; direct influence of reading comprehension towards students’ performance in mastering mathematical problems in PISA; direct influence of vocabulary mastery towards reading comprehension; direct influence of vocabulary mastery towards students’ performance in mastering PISA’ mathematical problems through reading comprehension. It can be concluded that in order to enhance student’ mathematical competence in PISA, we also have to improve their competence in vocabulary mastery and reading comprehension through improvement of teacher’s competence and infrastructures at school such as language laboratory. We hope that this study can be beneficial for further research to improve mathematical competences of the students.
Solid geometry educational game based on student’s mathematical understanding
Authors: Pramuditya S A , Rozak A , Rukmana D 
Published: October 2019

Abstract
The low ability of students in solid geometry material and the lack of use of digital media make students less active and creative in the learning process. One way to solve this problem is to develop valid learning media. It can be used as a supplement by students. The aim of this study is to develop learning media in the form of android-based educational games. This research is a development research, and uses the ADDIE model. This learning media was tested for validity by three validators, and the implementation was tested in one class consisting of 23 students. Based on the validation test obtained a percentage of 94.79% and its implementation has very practical results with a percentage of 97.71%. The percentage is based on the data of the results of the pretest and posttest results, obtained by students in solid geometry material — the ability of mathematical understanding increase in the medium category. From these results it can be concluded that the media based android education game can be used in the learning process in the solid material and easy to use for students.