Articles
<![CDATA[Analisis Iteman dan model Rasch pada pengembangan instrumen kemampuan berpikir kritis peserta didik sekolah menengah kejuruan ]]>
<![CDATA[Sri Nuryanti]]>;
<![CDATA[Muhammad Masykuri]]>;
<![CDATA[E. Susilowati]]>
<![CDATA[ Jurnal Inovasi Pendidikan IPA Vol 4, No 2: October 2018 ]]>
Publisher : <![CDATA[Faculty of Mathematics and Natural Sciences, Universitas Negeri Yogyakarta ]]>
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DOI: 10.21831/jipi.v4i2.21442
<![CDATA[Tujuan penelitian ini menganalisis instrumen kemampuan berpikir kritis. Penelitian ini merupakan penelitian kuantitatif. Data diperoleh dengan mengembangkan instrumen penilaian kemampuan berpikir kritis. Responden sebanyak 90 peserta didik yang diambil dari 3 SMK yang ada di kota Surakarta. Analisis data menggunakan perangkat lunak (software) analisis Iteman versi 3.0 dan Winstep versi 3.73. Metode yang digunakan dalam analisis ini yaitu metode tes klasik yaitu Iteman dan pemodelan Rasch. Hasil analisis dengan pemodelan Iteman diperoleh nilai Alpha Cronbach 0,80 berarti reliabilitas dari soal ini tinggi. Sedangkan dengan model Rasch Alpha Cronbach 0,74 berarti reliabilitas antara person dan item, sedangkan reliabilitas item 0,95 yang berarti item instrumen sangat bagus. Validitas item 0,93 menunjukkan soal dapat mengukur dan diperkuat dengan separation 4,34 item soal ini mempunyai sebaran respon yang baik. Instrumen kemampuan berpikir kritis dapat digunakan untuk penelitian selanjutnya. Iteman and rasch model analysis on the development of critical thinking instruments for vocational school students AbstractThe aimed of this study is to analyze the instrument of critical thinking skills. This research is quantitative research. Data was obtained by developing instruments for assessing critical thinking skills. Respondents were 90 students that taken from 3 Vocational Schools in Surakarta. Data analysis was using Iteman analysis software version 3.0 and Winstep version 3.73. The method used in this analysis were the classic test method, iteman and rasch models. The results of the analysis with iteman modeling obtained the Alpha Cronbach value of 0,800 means that the reliability of this problem was high. Whereas with the Rasch Alpha Cronbach model 0,74 means the reliability between person and item, while the reliability of the item is 0.95 which means the instrument item was very good. The validity of item 0.93 shows that the problem can be measured and reinforced with separation 4,34 items this question has a good distribution of responses. The instrument of critical thinking skills can be used for further research.]]>
<![CDATA[GREEN SYNTHESIS OF SILVER NANOPARTICLES USING CHITOSAN HYDROLYSATE AS STABILIZING AGENT AND THEIR ANTIBACTERIAL ACTIVITY ]]>
<![CDATA[Endang Susilowati]]>;
<![CDATA[Maryani .]]>;
<![CDATA[Ashadi .]]>
<![CDATA[ Indonesian Journal of Pharmacy Vol 26 No 1, 2015 ]]>
Publisher : <![CDATA[Faculty of Pharmacy Universitas Gadjah Mada, Yogyakarta, Skip Utara, 55281, Indonesia ]]>
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DOI: 10.14499/indonesianjpharm26iss1pp37
<![CDATA[Silver nanoparticles were successfully synthesized with chitosan hydrolysate as stabilizing agent at room temperature. Silver nitrate, glucose and sodium hydroxide were used as silver precursor, reducing agent and accelerator respectively. Chitosan hydrolysate was produced by enzymatic process with papain enzyme. Molecular weight of chitosan hydrolysate determined by viscosimetry methode based on Mark-Howink equation. The effect of molecular weight of chitosan hydrolysate as stabilizing agent and AgNO3 concentration toward surface plasmon resonance (SPR) of silver nanoparticle was investigated. It is also reported the antibacterial activity of silver-chitosan nanocomposites against Staphylococcus aureus and Escherichia coli. The products of silver nanoparticles were characterized by UV-Vis spectroscopy and transmission electron microscopy (TEM). The result showed that the formation of silver nanoparticles was shown by the appearance of surface plasmon resonance (SPR) at 403–421nm from the corresponding UV-Vis spectra. The molecular weight of chitosan hydrolysate affects the absorbance intensity and the wavelength of SPR. Silver nanoparticles were spherical in shape as identified by TEM images with size in range of 4–26nm. The silver nanoparticles have showed high antibacterial activity against Escherichia coli and Staphylococcus aureus.Key word: green synthesis, silver nanoparticles, chitosan hydrolysate, stabilizing agent, antibacterial activity]]>
<![CDATA[EFFECTIVENESS OF GUIDED DISCOVERY BASED THERMOCHEMISTRY MODULE TO TRAIN CRITICAL THINKING SKILLS BASED ON GENDER DIFFERENCES ]]>
<![CDATA[Andini Desikasari Nuraisyah]]>;
<![CDATA[Sulistyo Saputro]]>;
<![CDATA[Endang Susilowati]]>
<![CDATA[ Jurnal Tadris Kimiya Vol 5, No 1 (2020) ]]>
Publisher : <![CDATA[Department of Chemistry Education, UIN Sunan Gunung Djati Bandung ]]>
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DOI: 10.15575/jtk.v5i1.8149
<![CDATA[Critical thinking skills are important competencies that need to be developed in chemistry learning. This study aimed to determine the effectiveness of the guided discovery-based thermochemistry module in developing critical thinking skills based on gender differences. The subject of this research was 76 females and 20 males of class XI Mathematics and Nature Science from three high schools in Ponorogo, Indonesia. This study used one school for each category, namely high, medium, and low. The research method used a quasi-experimental design with one group pretest-posttest. The data analysis technique used T-test with SPSS 21 software. The result showed that the average increase in student scores or normality gain score (n-gain) was 0.5050 to 0.6362, which means students' critical thinking skills improved after the implementation of guided discovery-based thermochemistry modules. T-test result in high category schools obtained T count > T table (2.142> 2.032), which showed that there are significant differences between the critical thinking skills of female and male students. Meanwhile, T count and T table in medium category school were 1.353 and 2.034, respectively. T count and T table in low category school respectively 1.106 and 2.068. Analysis of T-test results in medium and low school categories can be written -T table < T count < T table, is means there is no significant differences between the critical thinking skills of female and male students. Thus, guided discovery-based thermochemistry modules are effectively applied to high, medium and low school categories.]]>
<![CDATA[Examining the Content Validity of Android-Based Augmented Reality Media for Chemical Bonding using Rasch Model ]]>
<![CDATA[Sri Yamtinah]]>;
<![CDATA[Sri Retno Dwi Ariani]]>;
<![CDATA[Martha Andriyanti]]>;
<![CDATA[Sulistyo Saputro]]>;
<![CDATA[Endang Susilowati]]>;
<![CDATA[Ari Syahidul Shidiq]]>;
<![CDATA[Dimas Gilang Ramadhani]]>;
<![CDATA[Isma Aziz Fakhrudin]]>
<![CDATA[ Jurnal Penelitian Pendidikan IPA Vol 7 No SpecialIssue (2021): December ]]>
Publisher : <![CDATA[Postgraduate, University of Mataram ]]>
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DOI: 10.29303/jppipa.v7iSpecialIssue.1094
<![CDATA[21st-century learning presents chemistry teachers with new challenges in teaching abstract chemistry concepts with various technologies that continue to develop. One of the media that can visualize abstract chemical concepts is Augmented Reality (AR). AR media developed in chemistry learning needs to be valid so that it can be used properly. Therefore, this study aims to examine the validity of the Android-based AR media developed. Four education practitioners carried out the validation as experts, and 13 students participated as respondents. The instrument used is a questionnaire with a Likert scale. The data obtained were analyzed quantitatively with the Rasch model using the facet software. The results of the analysis show that the Exact Agreements are 41.10%, and the Expected Agreements are 42.20%. The most challenging aspect to achieve is media design, while profit is the most easily agreed-upon aspect. Based on this assessment, in the development of augmented reality media, it is necessary to pay attention to display aspects and 3D objects suitable for viewing a material so that it is easier for users to understand the material.]]>
<![CDATA[Synthesis of Silver-Chitosan Nanocomposites Colloidal by Glucose as Reducing Agent ]]>
<![CDATA[Endang Susilowati]]>;
<![CDATA[Triyono Triyono]]>;
<![CDATA[Sri Juari Santosa]]>;
<![CDATA[Indriana Kartini]]>
<![CDATA[ Indonesian Journal of Chemistry Vol 15, No 1 (2015) ]]>
Publisher : <![CDATA[Universitas Gadjah Mada ]]>
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DOI: 10.22146/ijc.21220
<![CDATA[Silver-chitosan nanocomposites colloidal was successfully performed by chemical reduction method at room temperature using glucose as reducing agent, sodium hydroxide (NaOH) as accelerator reagent, silver nitrate (AgNO3) as metal precursor and chitosan as stabilizing agent. Compared to other synthetic methods, this work is green and simple. The effect of the amount of NaOH, molar ratio of AgNO3 to glucose and AgNO3 concentration towards Localized Surface Plasmon Resonance (LSPR) absorption band of silver nanoparticles was investigated using UV-Vis spectrophotometer. The stability of the colloid was also studied for the first 16 weeks of storage at ambient temperature. The formation of silver nanoparticles was confirmed by the appearance of LSPR absorption peak at 402.4–414.5 nm. It is also shown that the absorption peak of LSPR were affected by NaOH amount, ratio molar AgNO3/glucose and concentration of AgNO3. The produced silver nanoparticles were spherical with dominant size range of 6 to 18 nm as shown by TEM images. All colloidals were stable without any aggregation for 16 weeks after preparation. The newly prepared silver-chitosan nanocomposites colloidal may have potential for antibacterial applications.]]>
<![CDATA[ACTIVITY TEST OF GUAVA (Psidium guajava L.) LEAF METHANOL EXTRACT AS CONTRACEPTION ANTIFERTILITY TO WHITE MICE (Rattus norvegicus) ]]>
<![CDATA[Sri Retno Dwi Ariani]]>;
<![CDATA[Endang Susilowati]]>;
<![CDATA[Elfi Susanti VH]]>;
<![CDATA[Setiyani Setiyani]]>
<![CDATA[ Indonesian Journal of Chemistry Vol 8, No 2 (2008) ]]>
Publisher : <![CDATA[Universitas Gadjah Mada ]]>
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DOI: 10.22146/ijc.21632
<![CDATA[The aim of this research is to know about if the guava (Psidium guajava L.) leaf methanol extract on 10.5 mg/mL and 21.0 mg/mL dossages indicate a positive test as contraception antifertility to white mice (Rattus norvegicus). The sample is guava leaf from Mungkid, Magelang Central of Java Indonesia. The animals experiment are the white mice on 140-300 g for female, 200-250 g for male and about 3 months of age in average. The steps of this research are : (1) preparing sample, i.e. washing, drying on to indirect sunlight and make the sample into powder, (2) isolation the guava leaf powder in soxhlet instrument with hexane, (3) evaporation the sample with rotary evaporator until guava leaf hexane extract produced, (4) maseration the sample with methanol, (5) evaporation the sample with rotary evaporator until guava leaf methanol extract produced, (6) conducting contraception antifertility activity test to guave leaf methanol extract on 10.5 mg/mL and 21.0 mg/mL dossages to mice white. The results of this research are guava leaf methanol extract on 10.5 mg/mL and 21.0 mg/mL dossages indicate a negative contraception antifertility test to white mice but in these dossages have indicated that an antiimplantation effect (the total natality of fetus is less than the total implantation site in mice white).]]>
<![CDATA[Pendampingan Produksi Mie Sayuran Kekinian sebagai Upaya Meningkatkan Penghasilan UMKM Makanan di Karanganyar Jawa Tengah ]]>
<![CDATA[Endang Susilowati]]>;
<![CDATA[Mohammad Masykuri]]>;
<![CDATA[Maria Ulfa]]>
<![CDATA[ Jurnal Abdi Masyarakat Indonesia Vol 2 No 3 (2022): JAMSI - Mei 2022 ]]>
Publisher : <![CDATA[CV Firmos ]]>
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DOI: 10.54082/jamsi.375
<![CDATA[Usaha Mikro, Kecil, dan Menengah (UMKM) berpotensi untuk dikembangkan di masa pandemi karena kemampuan menyerap tenaga kerja dan menggunakan sumberdaya lokal, serta usahanya relatif bersifat fleksibel. Salah satu usaha kecil yang menarik untuk dikembangkan adalah usaha mie yang telah menjadi komuditas yang digemari masyarakat. Adapun jenis mie yang potensial untuk dikembangkan pada UMKM berbasis makanan adalah mie sayuran. Berdasarkan observasi di UMKM mie kekinian dengan merk “Nyelekitz” yang dikelola oleh Ibu Yuli di Kabupaten Karanganyar Jawa Tengah, ada masalah utama yang perlu diselesaikan. Masalah utama yang dihadapi adalah mie dan bumbunya masih dibeli dari tengkulak dan hanya 1 varian mie saja. Oleh karena itu tim pengabdian UNS melakukan pelatihan dan pendampingan produksi mie dengan varian aneka mie sayuran kekinian. Adapun metode yang dilakukan oleh tim pengabdian adalah melalui pelatihan dan pendampingan kepada mitra pada pembuatan mie sayuran dan bumbunya. Setelah mitra mahir membuat mie sayuran dan layak untuk dipasarkan, maka tim pengabdian melakukan pendampingan dalam pengemasan. Dari kegiatan pengabdian yang telah dilakukan diperoleh hasil bahwa mitra telah trampil membuat mie sayuran dan membuat bumbu mie kekinian. Berdasarkan uji organoleptic, produk mie yang dihasilkan disukai dan sudah layak dipasarkan. Pemasaran produk mie dilakukan di kedai rumah dan online melalui WA grup. Dengan kegiatan pengabdian ini mitra merasa sangat terbantu dan telah meningkatkan omset penjualan dan pendapatan hasil usaha mie kekinian. ]]>
<![CDATA[Studi komparasi learning cycle 5E dan learning together dikombinasi dengan drill and practice terhadap prestasi belajar kimia ditinjau dari keterampilan proses siswa ]]>
<![CDATA[Mita Fujiyanti]]>;
<![CDATA[Endang Susilowati]]>;
<![CDATA[Sulistyo Saputro]]>
<![CDATA[ Jurnal Inovasi Pendidikan IPA Vol 4, No 1: April 2018 ]]>
Publisher : <![CDATA[Faculty of Mathematics and Natural Sciences, Universitas Negeri Yogyakarta ]]>
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DOI: 10.21831/jipi.v4i1.18640
<![CDATA[Penelitian ini bertujuan untuk mengetahui perbedaan prestasi belajar antara siswa yang diberikan model pembelajaran Learning Cycle 5E dan Learning Together dikombinasikan dengan Drill and Practice; siswa yang memiliki keterampilan proses tinggi dan keterampilan proses rendah; serta interaksi antara pembelajaran Learning Cycle 5E dan Learning Together dikombinasi dengan Drill and Practice dengan keterampilan proses siswa terhadap prestasi belajar siswa pada materi pokok hidrolisis garam. Penelitian ini merupakan penelitian kuantitatif dengan metode eksperimen. Sampel penelitian terdiri dari dua kelas siswa (XI MIA 1 dan XI MIA 3) yang ditentukan dengan menggunakan teknik cluster random sampling. Data diperoleh melalui tes tertulis, angket, observasi. Hasil penelitian dapat disimpulkan bahwa: (1) siswa yang diberikan penerapan model pembelajaran Learning Cycle 5E memiliki prestasi belajar yang lebih baik dibandingkan siswa yang diberikan penerapan model pembelajaran Learning Together yang dikombinasikan dengan Drill and Practice; (2) siswa yang memiliki keterampilan proses tinggi memiliki prestasi belajar yang lebih baik dibandingkan siswa yang memiliki keterampilan proses rendah; dan (3) terdapat interaksi antara model pembelajaran Learning Cycle 5E dan Learning Together yang dikombinasikan dengan Drill and Practice dengan keterampilan proses siswa. Comparison Study of Learning Cycle 5E and Learning Together Combined With Drill and Practice on Student Achievement in Hydrolysis of Salt Viewed from Process Skill AbstractThe aim of this study were to know differences student’s achievement between Learning Cycle 5E models and Learning Together in combination with Drill and Practice; student’s achievement between higher process skill and lower process skill; and interaction between Learning Cycle 5E and Learning Together in combination with Drill and Practice models with process skill towards student’s achievement. This research is a quantitative research with experimental method. The sample consists of 2 class which taken by cluster random sampling technique. The techniques of collecting data using documentation, test, questionnaire, and observation. Based on result of the research can be concluded that: (1) student’s achievement of chemistry learning use Learning Cycle 5E better than Learning Together in combination with Drill and Practice models; (2) student’s achievement higher process skill better than lower process skill; and (3) there was an interaction between Learning Cycle 5E and Learning Together in combination with Drill and Practice models with process skill towards student’s achievement.]]>
<![CDATA[Pelatihan Produksi dan Pengemasan Sabun Cair Herbal Antiseptik Alami bagi UKM Sabun Herbal di Kota Surakarta ]]>
<![CDATA[Endang Susilowati]]>;
<![CDATA[Sri Retno Dwi Ariani]]>;
<![CDATA[Sri Mulyani]]>
<![CDATA[ Jurnal Abdi Masyarakat Indonesia Vol 2 No 6 (2022): JAMSI - November 2022 ]]>
Publisher : <![CDATA[CV Firmos ]]>
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DOI: 10.54082/jamsi.522
<![CDATA[Usaha Kecil dan menengah (UKM) sabun herbal merupakan salah satu usaha yang menarik untuk dikembangkan. Berdasarkan observasi di UKM sabun herbal Dejavu milik Ibu Sherly di Kota Surakarta, telah memproduksi dan memasarkan herbal padat dengan bahan aditif ekstrak dari buah dan sayuran. Namun usaha sabun ini masih perlu pengembangan produk supaya penjualannya meningkat. Program Kemitraan Masyarakat (PKM) UNS memberikan solusi melalui inovasi produksi sabun herbal cair antiseptik alami. Tujuan kegiatan ini adalah memberikan pelatihan produksi dan pemgemasan sabun herbal cair antiseptik alami. Pelatihan dilakukan dengan cara sosialisasi dan praktek pada produksi dan pengemasannya. Selanjutnya, sabun yang dihasilkan dari pelatihan dilakukan pengujian di laboratorium dan uji organoleptik. Hasil pelatihan menunjukkan UKM sabun herbal Dejavu telah dapat membuat dan mengemas 4 varian sabun antiseptik alami berupa sabun lidah buaya, sabun jeruk nipis, sabun sereh dan sabun sirih merah. Berdasarkan uji kualitas sabun diperoleh nilai pH yang memenuhi persyaratan SNI dengan kekentalan dan tingkat kestabilan busa yang baik. Berdasarkan uji organoleptik, sabun herbal cair ini bisa diterima konsumen dengan nilai yang cukup disukai. Sabun ini masih perlu diperbaiki terutama pada penambahan pewangi. Secara umum sabun hasil pelatihan yang dikemas dengan ukuran 250 mL dengan label sesuai variannya memiliki kualitas yang baik dan siap dipasarkan.]]>
<![CDATA[Content Validity in Android-Based Augmented Reality Media for High School Science Students on Covalent Bonds Topic: Rasch Model Analysis ]]>
<![CDATA[Sri Yamtinah*]]>;
<![CDATA[Mega Candra Dewi]]>;
<![CDATA[Nanik Dwi Nurhayati]]>;
<![CDATA[Endang Susilowati]]>;
<![CDATA[Isma Aziz Fakhrudin]]>;
<![CDATA[Dimas Gilang Ramadhani]]>;
<![CDATA[Ari Syahidul Shidiq]]>;
<![CDATA[Sulistyo Saputro]]>
<![CDATA[ Jurnal Pendidikan Sains Indonesia Vol 10, No 2 (2022): APRIL 2022 ]]>
Publisher : <![CDATA[Universitas Syiah Kuala ]]>
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DOI: 10.24815/jpsi.v10i2.23280
<![CDATA[The 21st-century chemistry learning that teaches abstract and complex concepts needs to develop learning media that can increase students' learning motivation and visualize abstract concepts in chemistry. One of the media in the 21st century developed in this study is Android-based augmented reality media. The purpose of this study was to test the validity of the Android-based Augmented Reality media and see the differences in perceptions between teachers and students in assessing media. The validation of android-based Augmented Reality learning media uses a questionnaire and is quantitative. The Rater for assessing the product consisted of 6 senior chemistry teachers at 5 different schools in Surakarta and 20 students who had obtained the material for covalent bonding at SMA N 1 Ngemplak Boyolali. The data obtained were analyzed by Rasch Model using Facets software. The results of the analysis show that exact agreements are 35.1% and exacted agreements are 35.2%. This happens because the aspects are considered easy by the teacher, but the students consider these aspects difficult. The aspect or item that is considered the most difficult to achieve is the suitability of the example with the material and improving understanding of the material. Based on this research, in developing media, it must be packaged properly so that it is easily understood and understood by students]]>
