Articles

TEORI FUNGSIONAL KERAPATAN STRUKTUR MEMBRAN NATA DE COCO TERSULFONASI Rahmawati, Sitti; Radiman, Cynthia L.; Martoprawiro, Muhamad A.; Nuryanti, Siti; Ma?ruf, A.
Chimica et Natura Acta Vol 7, No 2 (2019)
Publisher : Departemen Kimia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/cna.v7.n2.23823

Abstract

Penelitian ini bertujuan untuk menentukan struktur paling stabil dari berbagai struktur membran polimer nata de coco tersulfonasi.  Struktur energi minimum untuk dimer, trimer, tetramer dan pentamer nata de coco tersulfonasi ditentukan dengan metode DFT (teori fungsional kerapatan) dengan fungsional B3LYP dan basis set 6-311G(d). Nata de coco tersulfonasi merupakan polimer dengan satuan unit ulang (monomer) D-glukosa sulfonat dengan ikatan ?-1,4.  Hasil perhitungan struktur dimer, trimer, tetramer dan pentamernya menunjukkan tidak ada perubahan energi secara signifikan pada interaksinya dengan satu molekul air, yaitu sekitar -20.14 kkal/mol. Perhitungan energi tersebut memberikan dasar bahwa untuk perhitungan dan penelitian lebih lanjut tentang membran polimer nata de coco tersulfonasi bisa menggunakan bentuk dimernya.
PERANCANGAN PROGRAM PEMBELAJARAN IPA BERBASIS TEMATIK INOVATIF KELAS VII SMP Pursitasari, Indarini Dwi; Nuryanti, Siti; Rede, Amran
Kreatif Vol 17, No 1 (2014)
Publisher : Kreatif

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Abstrak : Tujuan dari penelitian ini adalah merancang program pembelajaran IPA berbasis tematik inoovatif yang dapat meningkatkan kemampuan berpikir kritis. Perancangan program dimulai dengan analisis pengetahuan awal dan gaya belajar siswa, analisis kurikulum, pemetaan kompetensi dasar dan topik pelajaran IPA. Selain itu dirancang juga alat evaluasi berupa tes kemampuan berpikir kritis, lembar observasi, dan angket. Hasil pemetaan selanjutnya dibuat silabus, RPP, LKS, dan media pembelajaran. Sintaks dalam pembelajaran IPAterpadu berbasis tematik dan inovatif adalahObservation, Questioning, Exploration, Analysis, Confirmation, and Evaluation (OQEACE). Kata kunci: IPA, tematik, inovatif, berpikir kritis
Meningkatkan Hasil Belajar Siswa SDN Pembina Toli-Toli Pada Pokok Bahasan Fungsi Organ Pencernaan Manusia Menggunakan Model Pembelajaran Kooperatif dan Edutainment Haryanto, Arun; Nuryanti, Siti; R.J, Minarni
Jurnal Kreatif Tadulako Online Vol 4, No 3 (2016): Junal Kreatif Tadulako Online
Publisher : Jurnal Kreatif Tadulako Online

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Masalah utama dalam penelitian ini adalah rendahnya hasil belajar siswa kelas Vc SD Negeri Pembina Tolitoli pada mata pelajaran IPA. Tujuan penelitian ini adalah untuk meningkatkan hasil belajar siswa di kelas Vc SDN Pembina Tolitoli, terutama pada mata pelajaran IPA. Penelitian ini merupakan Penelitian Tindakan Kelas yang dilaksanakan dalam dua siklus dan setiap siklus terdiri dari empat tahap, yaitu : perencanaan, pelaksanaan tindakan, observasi dan refleksi. Jumlah siswa sebanyak 36 orang. Hasil Penelitian menunjukan bahwa hasil belajar siswa SD Negeri Pembina Tolitoli mengalami peningkatan dari siklus I dengan nilai rata-rata 66,1 dan ketuntasan belajar kalsikal siswa 55,6 %. Pada siklus II diperoleh nilai rata-rata klasikal 92,4 dan ketuntasan belajar klasikal 100 %. Dengan demikian dapat disimpulkan bahwa penerapan model pembelajaran koopratif dan edutainment dapat meningkatkan hasil belajar siswa kelas Vc  SD Negeri Pembina Tolitoli  pada pokok bahasan Fungsi Organ Pencernaan Manusia. Kata Kunci: Metode Kooperatif; Edutainment; Hasil Belajar
Pemanfaatan Biji Kelor (Moringa oleifera L.) Sebagai Pasta Gigi Ma’ruf, Ahmad; Supriadi, Supriadi; Nuryanti, Siti
Jurnal Akademika Kimia Vol 5, No 2 (2016)
Publisher : Universitas Tadulako

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/j24775185.2016.v5.i2.8010

Abstract

Moringa seed (moringa oleifera L.) is a kind foodstuffs that contains calcium. Calcium is a mineral that is needed by our bodies in all ages, for the infants to the elderly. Calcium is useful in the formation and maintenance of bones and teeth. The aim of this study is to determine the concentration calcium (Ca) in moringa seed (moringa oleifera L.) and its utilization as the fabrication of toothpaste. The method used in this study was a laboratory experiment using a flame photometer. The results showed that the concentration of calcium in moringa seeds with three repetitions was 131.67 ± 12.58 mg/100g. The appropriate composition of materials to make toothpaste from moringa seeds including the roughness tests of toothpaste and based on the fondness of panelists was 25:5 (morinanga seed:NaHCO3). Furthermore, the test of freshness, aroma, and colour with comparison of glycerin, mint leaves, betel leaves and food coloring 7.5: 5: 5: 2.
Indikator Titrasi Asam-Basa dari Ekstrak Bunga Sepatu (Hibiscus rosa sinensis L) Nuryanti, Siti; Matsjeh, Sabirin; Anwar, Chairil; Raharjo, Tri Joko
Agritech Vol 30, No 3 (2010)
Publisher : Faculty of Agricultural Technology, Universitas Gadjah Mada, Yogyakarta, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (829.327 KB) | DOI: 10.22146/agritech.9671

Abstract

Titration acid-base needs indicator  to show the change of color on interval of hydrogen exponent/degree of acid (pH). Indicator of synthetic which always be used have disadvantages like chemical pollution,  stock and expensive of pro- duction  cost. The research has been carried out to substitute the synthetic indicator with herbal indicator extracted from flower crown of Hibiscus rosa sinensis L extract. The herbal indicator was extracted from the flower crown Hibiscus rosa sinensis L using a mixture methanol-acetic acid. Then it was evaluated with phenolphthalein and methyl orange(E merck) comparer to titration the acid-base, they are strong acid-strong base, weak base-strong acid and weak acid-strong base. The result of research show that herbal indicator  of flower crown Hibiscus rosa sinensis L to show theequivalent point in all titrations give peer result with the comparison. With the research result hoped that indicatortitration acid-base flower crown Hibiscus rosa sinensis L is able to as replace synthetic indicator  (metyl orange andphenolphtalein) which always be used before.ABSTRAKTitrasi asam-basa memerlukan indikator untuk menunjukkan perubahan warna pada setiap interval derajad keasaman (pH). Indikator sintetis yang digunakan selama ini mempunyai beberapa kelemahan seperti polusi kimia, ketersediaan dan biaya produksi mahal. Upaya penelitian sudah dilakukan untuk menggantikan indikator sintetis dengan indikator dari ekstrak mahkota bunga sepatu. Indikator herbal tersebut dibuat dengan cara mengekstrak mahkota bunga Hibiscus rosa sinensis L dengan mengunakan pelarut metanol-asam asetat. Kemudian dievaluasi dengan indikator pembanding fenolftalein dan metil oranye (produksi E merck) untuk titrasi asam-basa yaitu asam kuat-basa kuat, basa lemah-asam kuat dan asam lemah-basa kuat. Dari hasil penelitian diketahui bahwa indikator dari mahkota bunga sepatu untuk menunjukkan titik ekivalen dalam titrasi tersebut memberikan hasil yang setara dengan indikator pembandingnya. Hasil penelitian menunjukkan, indikator dari mahkota bunga sepatu dapat sebagai pengganti indikator sintetis (metil oranye dan fenolftalein) yang selama ini digunakan.
ISOLATION OF ANTHOCYANIDIN FROM WORA-WARI FLOWERS (Hibiscus rosa sinensis L.) AND ITS APPLICATION AS INDICATORS OF ACID-BASE Nuryanti, Siti; Puspitasari, Indarini Dwi; ., Ratman
Jurnal Agritech Vol 33, No 03 (2013)
Publisher : Jurnal Agritech

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (264.911 KB)

Abstract

Wora-wari plants are easily cultivated and founded in Indonesia, also their bloomy is not seasonal. Isolation of anthocyanidin from Wora-wari was done by maceration using n-hexane, ethyl acetate and methanol-HCl 1.0% and isolation of anthocyanidin was performed by column chromatography. Identification for structure of anthocyanidin was done by UV-Vis spectrophotometer, FT-IR, 1H- and 13C-NMR along with color reagent. In the Wora-wari flowers, it has been identified the existence of anthocyanidin pelargonidin. The color change of anthocyanidin pelargonidin results in acid solution was red and base solution was green.Keywords: Wora-wari flower, anthocyanidin, acid-base indicator
PENERAPAN MODEL PEMBELAJARAN KOOPERATIF TIPE NUMBERED HEAD TOGETHER (NHT) UNTUK MENINGKATKAN HASIL BELAJAR SISWA PADA MATA PELAJARAN IPA KELAS IV SD NEGERI 3 TONDO Suhardi, Suhardi; Pasaribu, Marungkil; Nuryanti, Siti
Jurnal Dikdas Vol 2, No 2 (2014)
Publisher : Universitas Tadulako

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (932.386 KB)

Abstract

Permasalahan pokok pada penelitian ini adalah rendahnya hasil belajar siswa kelas IVa SDN 3 Tondo pada mata pelajaran IPA. Salah satu faktor penyebab rendahnya hasil belajar siswa adalah Kurangnya varian model atau metode yang digunakan oleh guru dalam mengajar. Jenis penelitian ini merupakan penelitian tindakan kelas (PTK) yang dilaksanakan dalam dua siklus, setiap siklus meliputi perencanaan, pelaksanaan, observasi dan refleksi.Penelitian ini bertujuan untuk meningkatkan hasil belajar IPA siswa kelas IVa SDN 3 Tondo khususnya pada pokok bahasan struktur dan fungsi bagian tumbuhan dengan menerapkan model pembelajaran kooperatif tipe Numbered Head Together. Subyek penelitian adalah siswa kelas IVa SDN 3 Tondo yang berjumlah 20 orang. Manfaat penelitian ini adalah memberikan sumbangan pemikiran dan tolok ukur kajian dalam penelitian selanjutnya, selain itu dapat memberikan peningkatan mutu pembelajaran melalui model pembelajaran NHT. Jenis data yang dikumpulkan adalah data kualitatif berupa hasil observasi aktivitas siswa dan guru pada saat proses belajar-mengajar berlangsung, dan data kuantitatif berupa hasil belajar siswa melalui tes evaluasi akhir tindakan. Hasil siklus I diperoleh ketuntasan belajar klasikal 65%, aktivitas guru sebesar 87% dan aktivitas siswa sebesar 78%. Selanjutnya pada siklus II diperoleh ketuntasan belajar klasikal sebesar 85%, aktivitas guru berada pada kategori sangat baik yaitu 95% dan aktivitas siswa berada pada kategori sangat baik sebesar 92% Berdasarkan indikator penelitian maka dapat disimpulkan bahwa penerapan model pembelajaran kooperatif tipe Numbered Head Together dapat meningkatkan hasil belajar IPA siswa Kelas IV SD Negeri 3 Tondo Palu.Kata Kunci : Pembelajaran Kooperatif tipe NHT, Hasil Belajar IPA.
Uji Aktivitas Anti Jamur Ekstrak Kayu Manis (Cinnamomum burmanii Blume) Terhadap Jamur Candida Albicans Nuryanti, Siti; Jura, Minarni Rama; Nursucianti, Nursucianti
Jurnal Akademika Kimia Vol 4, No 3 (2015)
Publisher : Universitas Tadulako

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Cinnamon contains essential oils those can act as anti-fungal. This study aims to determine the inhibition of fungal growth of cinnamon extract against candida albicans. The study was conducted using a sample of cinnamon extract in some solvents those were distilled water, ethanol, and hexane, and the suspension of the fungus candida albicans which has been synchronized with the MC.Farland standard solution, and performed with pitting method. The results showed that the inhibition of cinnamon extract in hexane against candida albicans fungus was greater than in distilled water and ethanol. Hexane was the most dominant solvent to extract oil contained in cinnamon and some seeds, and also easy to evaporate and separate to produce more essential oils. Based on the observations the percentage of fungal inhibition of cinnamon extracts in distilled water, ethanol, and hexane solvents were, 3.19%, 0% and 100%, respectively.
Uji Daya Hambat Ekstrak Buah Kelor (Moringa oleifera Lamk) Terhadap Pertumbuhan Jamur Candida Albicans Nuryanti, Siti; Mustapa, Kasmudin; Sudarmo, I Gede
Jurnal Akademika Kimia Vol 5, No 4 (2016)
Publisher : Universitas Tadulako

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/j24775185.2016.v5.i4.8067

Abstract

Moringa (moringa oleifera lamk) is a nutritious plant that can cure various diseases. Part of this plant such as leaves, roots, flowers, and fruits serve as a traditional medicine. The aim of this study is to determine the inhibitory of extract of moringa fruit on the growth of the fungus candida albicans. The extract of moringa fruit is made by using several solvents such as distilled water, ethanol and hexane. Suspension of the candida albicans obtained from Clinical Laboratory, Palu, Central Sulawesi. Suspension of the candida albicans is synchronized with Mc. Farland solution. The fungus test uses a pitting method. The results showed that inhibition of extract of moringa fruit on the growth of the fungus candida albicans with solvents of distilled water provides greater results as compared with ethanol and hexane. Based on the results of the observation, the percentage of inhibition of the extract of moringa fruit on the growth of the fungus candida albicans with various solvents are 100% for distilled water, 59.99% for ethanol and 6.97% for hexane. The result of phytochemical screening test showed that the moringa fruit contains alkaloids, flavonoids and steroids.
INNOVATIVE-THEMATIC BASED INTEGRATED SCIENCE LEARNING ON NATURAL DIVERSITY THEME TO IMPROVE STUDENTS’ CRITICAL THINKING SKILLS IN JUNIOR HIGH SCHOOL Pursitasari, Indarini Dwi; Nuryanti, Siti; Rede, Amran
Unnes Science Education Journal Vol 7 No 2 (2018): July 2018
Publisher : Department of Integrated Science, Faculty of Mathematics and Natural Sciences, Universitas Negeri Semarang Collaborate with Perkumpulan Pendidikan IPA Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/usej.v7i2.25479

Abstract

Critical thinking skills should be trained and practiced in the learning process. This study aimed to describe the use of Innovative-Thematic Based Integrated Science (ITBIS) Learning Program to improve critical thinking skills of junior high school students in Palu. The study conducted in the 7th grade from one of Palu public schools and one of Palu private schools. Data were collected by observation sheet of learning performance and students activity, also test instrument for measuring students’ critical thinking skills. The data of learning performance and students activity were analyzed quantitatively, whereas the data of critical thinking skills were analyzed using descriptive and inferential statistics. The result showed that lTBIS learning can be done well either in public school and private school with average 98,03% and 90,20% respectively. ITBIS learning also improve students activity in the learning process. The average of critical thinking skills improvement (N-gain) was 68% (public school) and 63% (private school), and there were no significant differences between both of them. It showed that lTBIS learning can be used to build critical thinking skills of junior high school students.