Initial Ability Research Articles

First report of leaf blight of Avena strigosa caused by Pyrenophora avenicola in Japan.

Black oat (Avena strigosa Schreb.) is used as a cereal crop, forage crop or green manure in temperate regions. In Japan, it is mainly cultivated in Hokkaido island and, because of the vigorous initial growth and ability to suppress the proliferation of plant pathogenic nematodes (Uesugi et al. 2018), its use is recently increasing. In November 2021, a leaf spot and blight disease was observed in the grass cultivated in Kitahiroshima city (N43°0, E141°31). At first, blackish brown spindle-shaped or elliptical lesions, about 3 to 5 × 1 to 2 mm were formed on leaves, and they expanded by forming yellowish-brown halos around them, eventually resulting in leaf blight later on (Fig.1), damaging 5-10 % of leaf area, varied by cultivar. The lesions were excised, surface-sterilized, and incubated on water agar under near-UV light. Three single-spore isolates of Pyrenophora-like fungus were obtained from the lesions and deposited at the NIAS Genebank, Japan (https://www.gene.affrc.go.jp/index_en.php) as MAFF511692, 511693 and 511694. The sequences of ribosomal RNA gene (rDNA) and its internal transcribed spacer (ITS), and the gpd sequences of the isolates were analyzed as described by Marin-Felix et al. 2019. The rDNA-ITS sequences (GenBank accession no. LC769170, LC769171 and LC769172) of the isolates matched with that of the ex-type strain of Pyrenophora avenicola (MK539972) isolated from Avena seed. The sequences of the gpd (accession no. LC795722, LC795723 and LC795724) matched well with that of the ex-type strain (MK540180). Conidiophores of the isolates were septate, straight or flexuous, pale brown to olivaceous brown, 81.4 to 125.7 × 4.2 to 6.5 (ave. 106.4×5.7µm, n=50) µm, with hyaline vegetative hyphae (Fig.2). Conidia were slightly verrucose, cylindrical to obclavate, pale brown to olivaceous brown, 42.2 to 78.5 × 9.0 to 13.3 µm (ave. 56.9 ×10.4µm, n =50) and 2 to 7 distoseptate. This description overlap with the original description of P. avenicolai (Marin-Felix et al. 2019) and the leaf spot pathogen of Avena sativa reported in China (Chen et al. 2022). The fungus was identified as P. avenicola on the basis of morphology and molecular phylogenetic analysis. To produce inoculum, the isolate MAFF511692 was grown on V8 juice agar at 25°C under near-UV light for 7 days. Five plants each of cv. 'Soil saver', 'New oats' of A. strigosa (Kaneko seeds co.) and 'New almighty' of A. sativa (Snow brand seed co.) were grown in a greenhouse for approximately 14 days and then inoculated by atomizing them with the conidial suspension (104 conidia/ml) at the five-leaf stage. Five plants of each cultivar sprayed with sterilized distilled water served as the control. Inoculated plants were covered with plastic bags for 24 h at 25°C. After 5 days, blackish brown elliptical lesions developed on the leaves of all inoculated plants of both cultivars of A. strigosa (Fig. 3) and A. sativa, implying broad pathogenicity of the fungus to species and cultivars of Avena plants. Halo was not observed, maybe due to fewer stress in the greenhouse environment. Controls remained asymptomatic. The produced lesions were incubated as described above and the reisolated fungus was identified as P. avenicola based on the morphology, confirming Koch's postulates. To our knowledge, this is the first report of leaf blight caused by P. avenicola on black oat in Japan.

Data-driven predictions of retained austenite content and yield strength and elucidation of the sliding wear performance of carbide-free bainitic steels

Carbide-free bainitic (CFB) steels have drawn much attention due to their high strength and toughness. The present work aims to build machine learning (ML) based surrogate models to predict retained austenite (RA) content and yield strength (YS) of isothermal transformed CFB steels and study the sliding wear performance. The input data for ML prediction were related to compositions, heat treatment process, and phases. The Random Forest regression and Gaussian process regression were respectively selected to build the predictive models for RA content and YS. Result shows that the predicted RA content agrees well with the experimentally determined ones in steel with high stability of untransformed austenite. For YS prediction, the present surrogate model can predict YS of CFB steels even without additional microstructural information such as dislocation and effective substructure size. Steels with different YS and RA content were designed to study the sliding wear performance. Result shows that the dominant wear mechanism of the tested steels is abrasive wear and the weight loss is inversely proportional to hardness when the load and wear distance are constant. Increasing YS and RA content can increase the initial hardness and work hardening ability at the worn surface, thereby enhancing wear resistance.

Analysis of critical thinking ability of class X senior high school students

Students' critical thinking abilities influence the development of cognitive, affective and psychomotor abilities. Students who have critical thinking ability are able to analyze a problem so they can make decisions. The aim of the research is to determine and describe the initial critical thinking abilities of class X students at MA Nurul Huda, Central Java. This research is quantitative research based on critical thinking ability tests. The instrument used is a test sheet in the form of multiple-choice questions which contains indicators of critical thinking abilities. The results of the research are critical thinking abilities which are categorized into five, namely very good, good, sufficient, low, and very low. Based on data analysis, it is known that the initial critical thinking ability of grade X MA Nurul Huda Central Java students for very good, good, sufficient, low, and very low categories is 0%, 4,54%, 31,82%, 50%, and 13,64%. Therefore, it can be concluded that the critical thinking ability of class X students at MA Nurul Huda, Central Java, is low and needs to be improved.

Manajemen pembelajaran siswa dengan Autism Spectrum Disorder (ASD) di SLB Samara Bunda Yogyakarta

This study aims to determine the implementation of learning management students who have autistic disorders that include planning, organizing, implementing and evaluating for children with autistic disorders in Samara Bunda SLB Yogyakarta. Supporting factors and inhibitors in the implementation of learning for students who experience autistic disorders in Samara Bunda SLB Yogyakarta. The results of the ability of students who experience autism disorders after getting learning at Samara Bunda Yogyakarta SLB, this study uses a qualitative approach, the data sources in this study include the principal, vice principal of the affairs of Curriculum, Studentism, Advice and Infrastructure, class teacher, school committee, people old students, and documents, the main instrument in this study is the researcher. Learning management for students with autistic disorders consists of 1). Learning planning, 2). Organizing learning, 3). Implementation of learning, 4). Evaluation of learning. Students' ability as a result of participating in learning programs at Samara Bunda SLB is that students become emotionally stable, independent, confident, concentrated, child behavior becomes more controlled, social communication skills are increased, skilled and capable. Factors that support the learning of students with autistic disorders in Samara Bunda SLB are good and directed student abilities, good cooperation between the school and parents / guardians, good cooperation between schools, the government, stakeholders and observers of education in students with autism disorders , availability of facilities and infrastructure, adequate funding, and experts. The inhibiting factors in achieving learning goals are the students' initial abilities that have not been good, not directed, and behaviors that cannot be controlled, the absence of continuity between teachers and parents

Germination of soybean seeds after low-temperature storage and its dependence on weather and climate conditions in the places of reproduction of accessions

Background. Soybean (Glycine max (L.) Merr.) is a microbiotic whose seeds quickly lose germination in uncontrolled conditions at room temperatures. This determines the need to preserve accessions in special conditions. Low temperature storage (LTS) allows to maintain high seed germination ability, but not for all accessions. Therefore, it is relevant to assess the results of LTS at the VIR Genebank and to make an attempt to determine the best geographical conditions for growing plants and harvesting seeds that will be subjected to LTS. Materials and methods. The work was carried out on 312 soybean accessions from the VIR collection, originating from almost the entire area of soybean cultivation. The accessions used in the research were reproduced at three VIR experiment stations (ES), namely Adler ES, Kuban ES (Krasnodar Territory) and the Far East ES (Primorsky Territory). The seeds were harvested in 1999 to 2017 and stored in sealed foil laminated bags at –10°C from 2002 to 2021. The accessions were removed from LTS and germination assessed in 2022. Results. At the beginning of LTS, seed germination (Gi) ranged from 12 to 100% (averaging 79.1%), while that after LTS (Gr) ranged from 1 to 97% (57.8% on average). The retention of germination ability was expressed as the germination index (GI = Gr / Gi), which ranged from 0.02 to 1.73 (an average of 0.72). All the indicators of germination in the range of up to 20 years of LTS were not associated with the duration of LTS and with the number of years before LTS (0.5-4 years in our research). The climatic conditions characteristic of the place of reproduction had a significant impact on Gi and Gr, but not on GI. The average Gi of seeds obtained at the Adler ES and Kuban ES did not differ significantly (77.4% and 75.7%), while that of seeds harvested at the Far East ES was significantly higher (84.0%). Gr of the accessions from the Far East ES (64.3%) was also greater than that of accessions from the Kuban ES (52.2%) and Adler ES (57.2%). The excessively high sum of temperatures above 10°C (recorded in some years at all stations) reduced Gi, Gr but had little effect on GI. The highest values of Gi, Gr, and GI were demonstrated by the accessions maturing in 101-120 days. Additionally drying of the most late-ripening accessions (later than 140 days) in sheaves under an awning yielded seeds with high germination ability and good LTS tolerance. Conclusion. The seeds from different places of reproduction of accessions differed in germination before and after LTS, and, on an average, the highest values were demonstrated by the seeds harvested at the Far East ES, where the temperature regime is closer to the optimal one for soybeans. The seed germination index showed relative independence from the conditions of reproduction of accessions, including the climate and weather conditions, as well as the initial germination ability and LTS duration.

Kajian Kemampuan Membaca Permulaan Ditinjau dari Lingkup Keaksaraan pada Siswa Kelas I SD Negeri 51 Sungai Raya

Reading is the first step for students to understand learning. This research aims to examine initial reading abilities in terms of the scope of literacy in grade 1 students at SD Negeri 51 Sungai Raya. The type of research used is qualitative. The subject of this research was class 1B students with a total of 20 students. The main data used are test sheets and interview sheets. The analysis consisting of data collection, data reduction, data presentasion, data conclusions and data verificayion. Based on the research results, it can be concluded that the initial reading ability of class 1 students in terms of the scope of literacy is said to be good because the focus of the first research was recognizing letters verry wel with a percentage of 87,5% of students’ initial reading ability; the seconf reseatch focus atated that the picture group was very good with a percentage 0f 97,5% of students’ initial reading ability; and the third research focus was reading one’s own name well with a percentage of 87,5% initial reading ability in class 1b students at SD Negeri 51 Sungai Raya

Analisis Perbandingan Pembelajaran Individu dengan Pembelajaran Berkelompok Melalui Model Pembelajaran Kontekstual Mata Pelajaran Ekonomi terhadap Hasil Belajar di SMPN 1 Borbor

The problem in this study is to find out how individual learning compares with group learning through the contextual learning model of economics subjects on learning outcomes at SMPN 1 Borbor on various materials of human needs and fulfillment tools with a sample of 60 students. The research method in this study is used with a quantitative method. The students' scores in individual learning through contextual learning have an average score of 78.7586 with a standard deviation of 6.836 and group learning through the contextual learning model has an average score of 88.6667 with, so it can be concluded that there is a significant difference between the variables X1 (individual learning through the contextual learning model) X2 (group learning through contextual learning). As a study conducted by Suhprihtin Siti, et al, the influence of economic learning with a contextual teaching and learning (CTL) approach on economic learning outcomes is reviewed from the initial ability of students

Analyzing Junior High School Students’ Mathematical Communication Ability and Self Esteem using Discovery Learning Model

Mathematical reasoning, mathematical communication, mathematical problem solving, conceptual understanding, mathematical understanding, creative thinking and critical thinking are part of the mathematical abilities that students must have. One of the goals of learning mathematics according to NCTM is learning to communicate (mathematical communication). Mathematical communication skills in mathematics learning really need to be developed. This type of research design uses a quasi-experimental research design, namely pretest and post-test with non-equivalent control group design . The research used research subjects into two groups, namely the experimental group and the control group. The subjects of this research were students of class VII I MTs As-Sa'adah Padahanten Majalengka, numbering 64 people. Subjects were selected based on experimental class VIII A, 32 people and control class VIIIB, 32 people. Walkthroughs, questionnaires, and tests are techniques used in data collection. Data processing analysis was carried out qualitatively and quantitatively. The results of this research are that there is a difference in the effectiveness of the Discovery Learning model learning approach with the ordinary (conventional) learning model in terms of the aspects of mathematical communication skills and self-esteem of MTs in statistics material. The implications of the Discovery Learning learning model in this research are that it makes it easy for students to remember the lessons learned, integrate self concept according to their initial abilities, focus, be creative in exploratory projects, and the effect of knowledge transfer on learning outcomes can last a long time.

Developing Preservice Biology Teachers' Creative Thinking Skills Through Integrating E-Books into Problem-Based Learning

Developing Preservice Biology Teachers' Creative Thinking Skills Through Integrating E-Books into Problem-Based Learning. This research aims to find a low solution quality of teachers in North Maluku Province, Indonesia. One alternative proposed is integrating e-books into problem-based learning to see the impact on preservice biology teachers' creative thinking skills. Pre-experiment-bookstall research methodology and one group's pretest-posttest design are used. This research was carried out in 2024, and the research location was the Study Program for Biology Education, University of Khairun, Indonesia. The research subjects were preservice biology teachers. The selection of research subjects was based on the initial ability level (high, medium, low), so the number of research subjects was 6 (2 groups). The research results concluded that integrating e-books into a problem-based learning model was very effective in improving the creative thinking skills of preservice biology teachers. Further research also makes it possible to see the differences in the effect of providing learning activity links (e-books) before or after offline lectures are conducted.

Development of Multiple Representation Models in Physics Mechanics Learning Using a Self-Regulated Learning Approach

Abstract The challenge of learning mechanical physics is to help students with different characteristics learn to solve problems. Backgrounds education, initial abilities, understanding concepts, and self-regulated learning which can have an impact on representational abilities in solving physics problems. Model development needs to be carried out in an effort to facilitate students in learning to solve physics problems through a multiple representation model approach. Development uses the Dick & Carey model with descriptive analysis with pre and post-test design. The research was conducted at the Mathematics Education Departement, Mathematics and Science Faculty of Universitas Indraprasta PGRI, with a sample of 27 students taking physics mechanics course. Development has produced the VIFOCA learning model which consists of Visualization, Formulation, and Calculation. Formative evaluation involving instructional design experts, material and language experts obtained an average score of 4.75, while the formative evaluation of students showed an average score of 4.35, with a mean combined score of 4.55. The result of the evaluation formative show that the VIFOCA model is feasible for use in physics learning mechanics. The ability of physics problem solving is known based on the pre-test results of 61.33, while the post-test average is 68.74, with an increase of 12.08%. The results of this research indicate that the VIFOCA learning model can help facilitate learning and improve physics mechanics problem solving abilities.

Extraction and structural analysis of mannoproteins from different species of yeast: Bitter suppression and the potential mechanisms for wine

To rich the research for mannoproteins (MPs) suppressive effect on the bitterness of wine, this study distinguished bitterness into initial bitterness and bitter aftertaste. By utilizing the thermal alkali extraction method, MPs were extracted from three different yeast species: Saccharomyces cerevisiae (CECA), Lachancea thermotolerans (A38), and Torulaspora delbrueckii (2082). Their basic structures, addition concentrations, and correlation with bitter suppression ability were characterized. CECA exhibited stronger initial bitterness suppression ability, may attributed to its more branches and lack of a triple-helix structure. 2082 showed greater bitter aftertaste suppression and might due to smaller particle aggregation, fewer branches, and triple-helix structure. Additionally, it was noteworthy that due to the unique structure of 2082, it may bound more monomer and oligomeric proanthocyanidins (MOPC) on MPs surface, reducing its initial bitterness suppression ability. Concerning concentration, the increase in polysaccharide chain polymerization hindered further interaction with MOPC, leading to a decrease in its initial bitterness suppression ability. Bitter aftertaste exhibited different behaviors. As the concentration of CECA increased, there was an increase in oral adhesion instead.

THE INFLUENCE OF THE STRUCTURAL ANALYTICAL METHOD (SAS) WITH THE ASSISTANCE OF BIG BOOK MEDIA ON ELEMENTARY SCHOOL STUDENTS' BEGINNING READING ABILITY

This research was motivated by the results of UNESCO and PISA which stated that the literacy rate in Indonesia is still low, especially in beginning reading in elementary school students. The purpose of this study was to measure the initial reading ability of elementary school students, especially in grade I students. This research is a quasi-experimental research with a quantitative approach. Sampling was carried out using purposive sampling techniques. In obtaining data, researchers conducted initial tests (pretest) and final tests (posttest) in the form of preliminary reading tests, observation sheets and interviews. The data technique used is to use descriptive analysis techniques and descriptive statistical analysis by testing hypotheses using t-test statistics.. The data obtained are then analyzed using statistical analysis techniques, namely descriptive statistics. Descriptive statistical analysis data obtained average value (pretest) = 69,17 is in the very low category and average value (posttest) = 83,00 is in the high category. From the results of the hypothesis test analysis using paired sample test, a sig value = 0,001 is obtained in accordance with the basis for decision making, if the hypothesis test of the probability value of significance < 0.05, then H0 is rejected and Ha is accepted. Then significantly the alternative hypothesis (Ha) is accepted and the null hypothesis (H0) is rejected. Based on the hypothesis test, it can be concluded that the synthetic analytical structural method (SAS) with the help of big book media affects the initial reading ability in grade I students of SDN Kebalen 01 Kabupaten Bekasi.

Effectiveness of STEM Learning Model and Project-Based Learning to Enhance Critical Thinking Skills in Senior High School

STEM and Project-Based Learning (PjBL) learning models have been applied to support 21st century learning. However, no empirical evidence has been found to reveal the combined effectiveness of the two models. This study aims to determine the effectiveness of STEM, Project-Based Learning (PjBL), and lecture learning models in improving critical thinking skills. The research was conducted at SMA Negeri 8 Ternate City, North Maluku Province, involving 64 students divided into three classes studying Indonesian natural resource management. A concurrent embedded strategy combining quantitative and qualitative data collection was used. Initial test data indicated reliability at 0.76, with normality tests for the STEM model at 0.08, the PjBL model at 0.13, and lecture learning at 0.14, all showing normally distributed data. The homogeneity test showed homogeneous data with a value of 1.097. The balance test using one-way ANOVA indicated balanced initial abilities (Fhitung 2.52 Ftabel 3.14). Results demonstrated that by applying the STEM and PjBL learning models, students achieved proficiency in critical thinking skills. Final test data, including normality tests, one-way unequal ANOVA, and post-ANOVA tests, showed significant improvement in critical thinking skills. The STEM model and PjBL model were both effective with no significant differences between them, while both differed significantly from the lecture learning model. The results suggest that both STEM and PjBL models are effective in enhancing critical thinking skills. To address the shortcomings of traditional lecture methods, educators should consider integrating STEM and PjBL approaches into their teaching practices.

PENGARUH MODEL PEMBELAJARAN INKUIRI TERHADAP HASIL BELAJAR MATEMATIKA SISWA KELAS IV SEKOLAH DASAR

This research aims to determine the effect of the inquiry learning model on student learning outcomes in class IV Mathematics at SD Negeri 22 Sigaol Marbun for the 2023/2024 academic year. The research method used is an experimental method with a quantitative research type. To obtain the data required a test instrument of 25 questions. The total research sample was 31 students based on purposive sampling technique. To determine students' initial abilities, the research conducted a Pre Test with an average score of 56.77 which was included in the poor category. The results of the Post Test have improved from the Pre Test results given previously with the students' average score reaching 73.29 in the good category. It can be said that the level of success in student learning outcomes has increased as evidenced by the results of the correlation coefficient test calculation, which obtained r_count ≥r_tabel with results of 0.716 ≥ 0.355. Next, hypothesis testing compares the t_count ≥t_table value. The obtained value of t_count = 5.523 while t_table = 1.696. Because t_count ≥t_table (5.523 ≥ 1.696) then H_a is accepted and H_o is rejected. Through the t-test, it can be concluded that there is a significant positive influence between the Inquiry learning model (X) on student learning outcomes (Y).

Organocatalysts for L-Lactide polymerization: 2-alkyl- and 2-aryl-1,1,3,3-tetramethylguanidines

A series of 2-alkyl- and 2-aryl-1,1,3,3-tetramethylguanidine derivatives were synthesized, and their application in L-Lactide (LA) polymerization was studied. Bn-TMG was the best catalyst in LA polymerization ( [Bn-TMG] = 5 mM, conversion = 94 % after 4 h at 25 °C) compared to other monoguanidine derivatives. In addition, the catalytic activities of C2-dTMG exhibited higher catalytic activity than Bn-TMG, nBu-TMG (monoguanidine derivatives), and C3-dTMG (diguanidine derivative). Density functional theory calculations revealed that Bn-TMG deprotonated benzyl alcohol enhanced benzyl alcohol's initiation ability to LA, and the protonated Bn-TMG activated LA ring-opening process by interacting with the ether oxygen atom of LA. Bn-TMG presented excellent catalytic activity and controllability for LA polymerization at 25 °C.

Pengaruh Media Typewriter Alphabet Digital Berbantuan Audio Visual untuk Meningkatkan Kemampuan Membaca Permulaan Siswa Sekolah Dasar

This research aims to determine the effect of using audio-visual assisted digital alphabet typewriter media to improve the initial reading ability of grade 1 students at SDN 23 Batara. The type of research used in this research is Pre-Experimental Design with a One-Group Pretest-Posttest Design research design. The population of this study was all grade 1 students at SDN 23 Batara. The sample consisted of 26 people. The collected data was processed using descriptive statistical analysis and inferential statistical analysis. Based on the results of descriptive analysis, the average value (pretest) was 66.85 and the average value (posttest) was 90. Meanwhile, based on the results of inferential statistical analysis, t-test results were obtained with a significant value (2 tailed) <0.05, namely < 0.000 means H0 is rejected and H1 is accepted. Thus, it can be concluded that there is a significant influence between the application of audio-visual assisted digital alphabet typewriter media on the beginning reading ability of grade 1 students at SDN 23 Batara.

The Effect of Ethnomathematics Approach on Numbers 1-20 Counting Skills for Children 4-6 Years Old

Children aged 0-6 years are at an age where cognitive development is very rapid. Counting ability is one of the things that cannot be ignored in this case. The Ethnomathematics approach is an approach that prioritises cultures that contain mathematical values This study aims to determine the ethnomathematics approach to counting skills 1- 20 students aged 4-6 years. This research is a quasi-experimental research with posttest only control design, with a sample of 22 children out of 44 students at RA Al-Qur'an Dina Padang Matinggi. The results showed a significant effect of initial counting ability on the final counting ability of experimental class students using the ethnomathematics approach.experimental class students who used the ethnomathematics approach. Statistical results show the value of F = 18,861 with a significance of 0.000 (p < 0.05). The Ethnomathematics approach can be used in the learning process at the early childhood education level. So that counting skills can develop through this approach. And of course it is necessary to pay attention to the understanding of the culture possessed by students after the learning process is carried out

Kajian Kemampuan Membaca Permulaan Siswa Kelas I SDN 38 Sungai Ambawang

This study aims to determine the initial reading ability of grade 1 students of SDN 38 Sungai Ambawang. This type of research uses a qualitative approach. The data collection technique in this study uses the EGRA test. The researcher used the EGRA test in assessing the initial reading ability of grade 1 students of SDN 38 Sungai Ambawang. The EGRA test consists of five aspects, namely knowing letters, reading words, reading words that have no meaning, fluency in reading aloud and comprehension of reading and listening (listening comprehension). The results of the study showed that the ability of grade 1 students of SDN 38 Sungai Ambawang in the aspect of recognizing letters was 77%, of which 5 out of 15 students were still unable to recognize letters. The aspect of word reading resulted from the average ability of students was 69%, of which 6 out of 15 students were found to be in the good to very good category in word reading. The aspect of reading words has no meaning found that 7 out of 15 students are still not good at reading words that do not mean the average score of the whole student, which is 60%. The aspects of fluency in reading aloud and comprehension were found as many as 7 out of 15 students were less able in reading aloud and reading comprehension, their average score was 60%. The aspect of listening (listening comprehension) was found as many as 7 out of 15 students who were not completely good at answering questions given by the researcher about the reading, read with an average score of 63% of their ability

Pengaruh Kartu Huruf Terhadap Kemampuan Membaca Permulaan Siswa pada Mata Pelajaran Bahasa Indonesia Kelas II di Sekolah Dasar

This study aims to determine the effect of the use of letter card media on students' initial reading ability in Indonesian Language subject grade II in elementary school. This research is a quantitative research with an experimental research method with a quasi experiment type. The sample of this study was taken using a saturated sampling technique consisting of two classes, namely class II A with 20 students as a control class without using letter cards and class II B with 20 students as an experimental class using letter card media. The data collection technique used in this study is a performance test (initial reading test) using pretest and posttest. The results of the research from both classes, namely in the pretest, had an average value (Mean) of the experimental class of 52.50 and the control class of 49.69. At the time of the posttest, the average score (Mean) of the experimental class was 80.94 and the control class was 59.69. The results of the hypothesis show that the tcount value > the table is 5,146 > 1,684 which means that H0 is rejected and H1 is accepted. So, the hypothesis states that the letter card media has an effect on students' initial reading ability in Indonesian subjects grade II at UPT SDN 060816 Medan.

Solvent-free synthesis of diacylglycerols via enzymatic glycerolysis between edible oils and glycerol catalyzed by self-made immobilized lipase PS@LXTE-1000

Diglycerol (DAG) is a structural lipid with the functions to lower body fat accumulation and decrease serum triglyceride level. However, the enzymatic synthesis of DAG is limited by the high-efficient and economic lipases. In this paper, the immobilized lipase PS@LXTE-1000 was self-made by immobilizing the Pseudomomas cepacian lipase on to the hydrophobic microporous resin LXTE-1000. The results indicate that LXTE-1000 was a uniform mesoporous sphere with the mean diameter of 400 ​μm, pore size of 14.6 ​nm, pore volume of 0.5 ​cm3/g and surface area of 126.0 ​m2/g, showing superior structural properties for lipase immobilization. Under the optimal reaction conditions with the molar ratio of rapeseed oil to glycerol being 1:1, adding amount of immobilized lipase being 4%, reaction at 50 ​°C, the highest DAG content of 46.7% was achieved in 3 ​h via enzymatic glycerolysis catalyzed by LXTE-1000. After 7 cycles of reuse, the self-made LXTE-1000 could still retain 78.3% of its initial catalytic ability. Besides, LXTE-1000 was observed to facilitate the DAG production via glycerolysis reaction between glycerol with other seven edible oils including corn oil, sesame oil, peony seed oil, rice bran oil, peanut oil, soybean oil and flaxseed oil. Specifically, the glycerolysis reaction with sesame oil, peony seed oil and rice bran oil even led to the DAG content of 52.1%, 53.3% and 51.2%, respectively, Hence, this paper provide a novel strategy to produce high-efficient and economic immobilized lipases, which shows great potential in the green synthesis of functional lipids such as DAG.