cover
Article Per Year (5 Year)
All
Home Page
OAI Link
Editorial Team
Contact
Reviewer
Google Scholar
Contact Name
-
Contact Email
-
Phone
-
Journal Mail Official
-
Editorial Address
-
Location
Kab. sleman,
Daerah istimewa yogyakarta
INDONESIA
Jurnal Penelitian Saintek
Published by Universitas Negeri Yogyakarta
ISSN : 14123991     EISSN : 25287036     DOI : 10.21831
Core Subject : Science,
Decision Sciences, Operations Research & Management
Arjuna Subject : -
Articles 286 Documents
 25   26   27   28   29 
Variasi dan analisis fenetik Bavoa (cleome gynandra l.) di Sulawesi Tengah berdasarkan penanda morfologis Ramadhani, Ayu Syahputri; Purnomo, Purnomo
Jurnal Penelitian Saintek Vol 28, No 2 (2023)
Publisher : Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/jps.v1i2.50830

Abstract

Tujuan penelitian ini adalah menentukan variasi morfologis tiap aksesi Bavoa, serta hubungan fenetik pada spesies antar aksesi Bavoa. Sebanyak 10 sampel diambil di wilayah Sulawesi Tengah, karakter morfologis yang dibandingkan berjumlah 22 karakter bersumber dari  batang, daun, bunga, dan buah. Karakterisasi morfologis mengacu pada deskriptor Cleome gynandra L. dengan modifikasi. Indeks similaritas antar aksesi (OTUs) dihitung melalui rumus Gower's general similarity coefficient. Klastering dilakukan dengan metode UPGMA, analisis PCA untuk melihat karakter yang berpengaruh terhadap pembetukan klaster. Hasil penelitian menunjukkan variasi morfologis Bavoa di Sulawesi Tengah  memiliki perbedaan warna batang dan tangkai daun, bulu pada batang, dan ukuran tanaman Berdasarkan analisis fenetik Bavoa di Sulawesi Tengah dapat diketahui bahwa hubungan kekerabatan fenetik berdasarkan karakter morfologis terbagi menjadi  empat klaster. CG1, CG4, dan CG10 membentuk klaster tersendiri berdasarkan pH tanah, pengelompokkan CG9 dan CG7, CG2 dan CG5 menunjukkan adanya sifat plastisistas tanaman.Kata kunci: Bavoa, morfologi, dan fenetikVariation and phenetic analysis of Bavoa (cleome gynandra l.) in Central Sulawesi based on morphological markersAbstract: The purpose of this study was to determine the morphological variations of each Bavoa accession, as well as the phenetic relationship between species between Bavoa accessions. A total of 10 samples were taken in the Central Sulawesi region, the morphological characters compared were 22 characters sourced from stems, leaves, flowers, and fruit. Morphological characterization refers to the descriptor Cleome gynandra L. with modification. The similarity index between accessions (OTUs) was calculated using Gower's general similarity coefficient . Clustering was carried out using the UPGMA method, PCA analysis to see the characters that affect cluster formation. The results showed that morphological variations of Bavoa in Central Sulawesi had different stem and petiole colors, stem hairs, and plant size. CG1, CG4, and CG10 formed separate clusters based on soil pH, grouping CG9 and CG7, CG2 and CG5 indicated the presence of plant plasticity.Keywords: Bavoa, morphology, and phenetic
Pengaruh variasi campuran limbah pupuk organik cair terhadap dinamika populasi arthropoda pada tanaman kacang tanah Damayanti, Nurul Ainunnisa; Suhartini, Suhartini
Jurnal Penelitian Saintek Vol 28, No 2 (2023)
Publisher : Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/jps.v1i2.63895

Abstract

Tujuan penelitian ini untuk mengetahui: pengaruh variasi campuran limbah POC pada pupuk organik cair terhadap famili arthropoda tanah pada tanaman kacang tanah, pengaruh variasi konsentrasi POC terhadap keberadaan Arthropoda tanah pada tanaman kacang tanah, dan pengaruh variasi campuran limbah buah, sayur, serta kotoran ternak pada pupuk organic cair terhadap dinamika populasi Arthropoda tanah pada tanaman kacang tanah. Penelitian ini merupakan penelitian eksperimen rancangan acak lengkap dengan mengamati dinamika populasi Arthtopoda tanah pada tanaman kacang tanah. Pengambilan data dilakukan menggunakan metode hand sweeping. Penelitian ini berlangsung selama sebelas bulan dari bulan Juni 2022-Mei 2023 dengan pengambilan data Arthropoda tanah sebanyak 12 kali. Data yang diambil meliputi data klimatik dan edafik pada setiap pengamatan serta seluruh jenis Arthropoda tanah pada pot penelitian. Data yang diperoleh dianalisis menggunakan indeks keanekaragaman, indeks kemerataan, indeks dominansi, dan indeks kekayaan jenis. Hasil penelitian menunjukkan bahwa terdapat 7 famili Arthropoda tanah yang ditemukan. Dinamika populasi Arthropoda tanah pada tanaman kacang tanah mengalami perubahan dari waktu ke waktu dengan menunjukkan hasil yang fluktuatif. Modifikasi habitat dengan variasi campuran limbah buah, sayur, dan kotoran ternak pada pupuk organik cair sebagai perlakuan tidak memberikan pengaruh yang efektif terhadap dinamika populasi Arthropoda tanah pada tanaman kacang tanah. Kata kunci: dinamika populasi, variasi campuran POC, Arthropoda tanahThe effect of waste mixture variation on the liquid organic fertilizer to population dynamics of arthropods on peanut plantsAbstract: The reaserch aims to determine: the effect of variations in the mixture of fruits, vegetables, and livestock waste in liquid organic fertilizer to the families of soil Arthropods found in peanut plants, the effect of variations in the mixture of fruits, vegetables, and livestock in liquid organic fertilizer on the population dynamics of soil arthropods on peanut plants. This reaserch was a completely randomized design experiment, data were collected by observing the population dynamics of soil Arthropods found in peanut plants. Data were collected using the hand-sweeping method. The research lasted for eleven months from Juni 2022 to May 2023 with data collection of Arthropods for 12 times. Data included climatic data at each observation and all types of soil arthropods on peanut plants. The data obtained were analyzed using diversity index, evenness index, dominance index, and species richness index. The results showed that there appeared to be 7 families of soil arthropods. The population dynamics of soil arthropods in peanut plants changed from time to time by showing ups and downs. Habitat modification with various mixtures of fruit, vegetable, and livestock waste in liquid organic fertilizer as treatments did not have a effective  effect on the population dynamics of soil arthropods in the plant peanut (Arachis hypogaea). Keywords: population dynamics, variation of liquid organic fertilizer, soil arthropods
Aplikasi variasi jumlah pelat elektroda Al-Fe pada pengurangan mikroplastik dalam limbah masker secara elektrokoagulasi Marwati, Siti Marwati; Yosephine Louise, Isana Supiah; Padmaningrum, Regina Tutik; Rahmawati, Aprilia; Hamida, Zahra; Julia, Ardhita
Jurnal Penelitian Saintek Vol 28, No 2 (2023)
Publisher : Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/jps.v1i2.67098

Abstract

Penelitian ini bertujuan untuk mengetahui pengaruh jumlah pelat elektroda Fe-Al pada pengurangan mikroplastik dalam limbah masker secara elektrokoagulasi. Sampel penelitian adalah limbah masker medis. Masker dipotong-potong dengan ukuran 1-5 mm. Potongan masker tersebut direndam dalam aquades selama 7 hari. Cairan yang mengandung mikroplastik dielektrokoagulasi dengan kombinasi pelat elektroda (Al-Fe), (Al-Fe-Al), dan (Al-Fe-Al-Fe) selama 4 jam, arus listrik 2,5 A dan pH 6,0. Serat mikroplastik sebelum dan sesudah elektrokoagulasi diamati dengan mikroskop perbesaran 40 kali. Karakterisasi mikroplastik dilakukan dengan menggunakan FTIR (Fourier Transform Infra Red) dan SEM (Scanning Electron Microscope). Hasil penelitian menunjukkan bahwa efektifitas pengurangan mikroplastik yang dielektrokoagulasi menggunakan kombinasi pelat elektroda (Al-Fe), (Fe-Al-Fe), (Al-Fe-Al-Fe) berturut-turut adalah 82,5; 87,5; dan 90,0%. Semakin banyak jumlah pelat pada elektrokoagulasi mikroplastik dapat meningkatkan efektifitas pengurangan mikroplastik. Gugus fungsi yang terkandung dalam masker sebelum dan sesudah elektrokoagulasi mempunyai kemiripan dengan flok yang dihasilkan. Gumpalan Flok hasil elektrokoagulasi berbentuk variatif dan terdapat serat.Kata kunci: elektroda, elektrokoagulasi, masker, mikroplastik, pelat Fe-Al Application of variation in Al-Fe electrode plates to reduce microplastics in masks waste by electrocoagulationAbstract: This study investigates how the number of Fe-Al electrode plates affects electrocoagu-lation's effectiveness in decreasing mask waste microplastics. The sample in this study was medical mask waste. The mask is chipped into 1-5 mm pieces. The pieces of the mask are soaked in distilled water for seven days. Liquid-containing microplastics were electrocoagulated with a combination of Fe-Al, Fe-Al-Fe, and Fe-Al-Fe-Al electrode plates for 4 hours at an electric current of 2.5 A and a pH of 7.0. Microplastic fibers before and after electrocoagulation were observed with a forty-fold magnification microscope. Microplastic characterization was carried out using FTIR (Fourier Transform Infra Red) and SEM (Scanning Electron Microscope). The results showed that the effectiveness of electrocoagulation microplastics using a combination of electrode plates (Fe-Al), (Fe-Al-Fe), and (Fe-Al-Fe-Al) was 82.5, 85.0, and 87.5%, respectively. The efficiency of microplastic reduction can be improved by using more plates in microplastic electrocoagulation. The functional groups contained in the masks before and after electrocoagulation are similar to the flocs produced. Floc clumps resulting from electrocoagulation are varied in shape and contain fibers.Keywords: electrocoagulation, electrode, face mask, microplastic
Perancangan instalasi kabel 20 kV pada auxiliary transformer sebagai alternatif back feeding PLTGU Jawa 2 Afrianda, Rio; Putra, Setianto Rama
Jurnal Penelitian Saintek Vol 28, No 2 (2023)
Publisher : Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/jps.v1i2.65193

Abstract

Dalam rangka mewujudkan program pemerintah 35000 MW dilakukan pembangunan Pusat Listrik Tenaga Gas dan Uap (PLTGU) Jawa 2, kapasitas daya sebesar 800 MW dengan sistem interkoneksi 500 kV yang terletak di daerah PLTGU Tanjung Priok Jakarta Utara. Pada PLTGU Jawa 2 dalam pelaksanannya terdapat beberapa tahapan sebelum dilakukan pengoperasian pembangkit seperti tahapan konstruksi dan pengujian/komisioning. Dalam pengujian peralatan, kebutuhan listrik menggunakan sumber daya listrik dari jaringan eksisting milik PT PLN atau disebut juga dengan back feeding. Salah satu alternatif back feeding PLTGU Jawa 2 adalah dengan menggunakan sumber daya listrik dari kubikel 20 kV GIS 150 kV Priok Timur Lama.Cara ini berpotensi mengalami keterlambatan apabila instalasi penyambungan kabel 20 kV yang menyuplai unit auxiliary transformer tidak dilakukan dengan benar. Kabel 20 kV yang terhubung dengan bushing unit Auxiliary Transformer akan mengalami stress cable jika nilai bending radius kabel dalam penyambungan kabel 20 kV ke bushing unit auxiliary transformer tidak diperhatikan. Dari kendala tersebut dapat dilakukan kajian mengenai perancangan instalasi penyambungan kabel 20 kV yang menyuplai unit Auxiliary Transformer. Selain itu, kajian mengenai penentuan jenis kabel 20 kV yang akan digunakan juga diperlukan agar sumber daya listrik dapat tersalurkan ke peralatan yang akan dilakukan pengujian secara optimal. Dengan dilakukan kajian tersebut pelaksanaan back feeding dapat berjalan sesuai jadwal yang telah ditentukan dan kendala saat pelaksanaan pengujian back feeding dapat diantisipasi sebelumnya.Kata kunci: back feeding, unit auxiliary transformer, kabel 20 kV Design of 20 kV cable installation on auxiliary transformer as an alternative back feeding for PLTGU Jawa 2Abstract: In order to actualize the 35,000 MW government program, the JAWA 2 Combined Cycle Power Plant (PLTGU) is built, with a power capacity of 800 MW and distributed trough a 500 kV interconnection system located in the PLTGU Tanjung Priok area, North Jakarta. This project have several stage before the operation such as planning, construction and testing/commissioning. In testing period, the electricity required for testing the equipment is supplied from the existing power grid or also known as back feeding. One of the alternatives for back feeding PLTGU Jawa 2 is to use electricity from the 20 kV GIS 150 kV cubicle of Priok Timur Lama, this method has the potential of delays if the installation of the 20 kV cable connection that supplies the Auxiliary Transformer unit is not carried out properly. The 20 kV cable connected to the Auxiliary Transformer bushing unit will experience cable stress if the bending radius of the cable in connecting the 20 kV cable to the Auxiliary Transformer bushing unit is not taken into account. From these constraints a study can be carried out on the installation design of the 20 kV cable connection that supplies the Auxiliary Transformer unit. moreover, a study to determine of the type of 20 kV cable is also necessary so that the power source can be optimally distributed to the equipment to be tested. With this study, the back feeding can proceed according to a predetermined schedule and any issue during the back feeding test can be anticipated beforehand. Keywords: back feeding, unit auxiliary transformer, 20 kV cable
Analysis of microbiological hazards in turmeric tamarind traditional drink products Lifiana, Aulia; Amarantini, Charis; Budiarso, Tri Yahya
Jurnal Penelitian Saintek Vol 29, No 1 (2024)
Publisher : Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/jps.v1i1.70596

Abstract

This study aimed to determine the presence of bacterial contaminants, specifically Escherichia coli, Salmonella sp., and Staphylococcus aureus, in turmeric tamarind traditional drink products according to the Indonesian National Standard (SNI 2019). The research was conducted using samples from 11 different locations in Yogyakarta. The samples were analyzed using Chromocult Coliform Agar (CCA), Salmonella Shigella Agar (SSA), and Baird Parker Agar (BPA) to isolate the specific bacteria. Further biochemical tests, including IMViC, Urease, and sugar fermentation tests, as well as confirmation using API 20E and API STAPH tests, were performed on the suspected isolates. The findings reveal that Escherichia coli, Salmonella sp., and Staphylococcus aureus were not detected in any of the samples. Thus, the traditional turmeric tamarind drink is considered safe for consumption according to the tested parameters. Keywords: turmeric tamarind, microbiological hazard, Klebsiella pneumoniae, Staphylococcus aureus. E. coli
Kajian konsep arsitektur kubisme pada bangunan perkantoran, pendidikan, dan peribadatan Islam Anisa, Anisa; Fahrezzy, Farhan; Faizulhafidz, Maulana Sadam; Fakhri, Reza M
Jurnal Penelitian Saintek Vol 29, No 1 (2024)
Publisher : Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/jps.v1i1.72436

Abstract

Tujuan penelitian ini adalah untuk mengidentifi kasi, mendeskripsikan, dan menafsirkan penerapan konsep arsitektur kubisme pada bangunan perkantoran, pendidikan, dan peribadatan Islam. Metode yang digunakan pada penelitian ini adalah deskriptif kualitatif, dengan data kombinasi primer dan sekunder sebanyak 9 bangunan sebagai kasus penelitian. Pengumpulan data menggunakan observasi lapangan, wawancara, dan literatur. Sedangkan analisis kualitatif menggunakan model miles-huberman. Hasil dari penelitian ini adalah telaah penerapan arsitektur kubisme pada 9 kasus bangunan dengan tipologi perkantoran, pendidikan, dan peribadatan yang ditunjukkan dengan tiga hal yaitu bentuk massa bangunan, fasad bangunan, dan hubungan ruang-bukaan untuk pencahayaan alami. Bentuk massa bangunan berupa kubus walaupun pada perkembangannya tidak harus semua sisinya persis sama, karena ditunjang dengan fasad yang memiliki kesamaan antar sisi. Kesamaan dapat berupa pola, bentuk, warna, maupun elemen dan material. Sedangkan hubungan ruang di dalam bentuk massa tersebut meminimalisir pembatas sehingga dengan desain bukaan yang tepat dapat meneruskan cahaya masuk ke dalam bangunan.Kata kunci: arsitektur kubisme, perkantoran, pendidikan, peribadatanStudy of cubist architecture concepts in offi ce buildings, educational institutions, and Islamic places of worship Abstract: The aim of this study was to identify, describe, and interpret the application of Cubist architectural concepts in office buildings, educational institutions, and Islamic places of worship. The research employed a qualitative descriptive method, utilizing a combination of primary and secondary data from nine buildings as case studies. Data were collected through fi eld observations, interviews, and literature review, and analyzed qualitatively using the MilesHuberman model. The fi ndings reveal the application of Cubist architecture in the nine case study buildings, categorized into office, educational, and religious typologies, through three main aspects: building mass form, facade design, and spatial relationships for natural lighting. The building mass typically takes the form of cubes, although not all faces need to be identical due to the supporting facades that exhibit similarities between sides. These similarities may involve patterns, shapes, colors, or materials. Additionally, the spatial arrangement within the mass minimizes barriers, allowing for eff ective light transmission into the building through well-designed openings. Keywords: Cubist architecture, office buildings, educational institutions, places of worship
Optimasi konsentrasi katalis Natrium Hidroksida pada sintesis 2,5-bis((E)-3,4-dimetoksibenziliden)siklopentan-1-on Tjakraningtyas, Wahyu; Budimarwanti, Cornelia
Jurnal Penelitian Saintek Vol 29, No 1 (2024)
Publisher : Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/jps.v1i1.71399

Abstract

Penelitian ini dilakukan dengan tujuan untuk sintesis senyawa 2,5-bis((E)-3,4 dimetoksibenziliden)siklopentan-1-on dengan variasi mol katalis NaOH serta mengetahui rendemen senyawa (2E,5E)-2,5-bis(3,4-dimetoksibenziliden) siklopentanon yang telah disintesis. Sintesis dilakukan dengan mereaksikan siklopentanon sebanyak 5 mmol dan veratraldehida sebanyak 10 mmol menggunakan katalis NaOH dengan variasi 5, 10, 15, dan 20 mmol dan pelarut etanol. Proses sintesis berjalan melalui reaksi kondensasi Claisen-Schmidt menggunakan metode microwave assisted organic synthesis selama 60 detik. Hasil sintesis yang diperoleh kemudian dilakukan karakterisasi melalui KLT dan KLT scanner, FTIR, dan 1H-NMR. Hasil penelitian diperoleh senyawa berbentuk serbuk kuning dan hasil karakterisasi menunjukkan bahwa senyawa tersebut merupakan senyawa target (2 E,5E)-2,5-bis(3,4-dimetksibenziliden) siklopentanon. Rendemen senyawa (2E,5E)-2,5-bis(3,4-dimetoksibenziliden) siklopentanon yang dihasilkan oleh variasi mol katalis NaOH 5, 10, 15, dan 20 mmol secara berturut-turut yaitu 71,75%; 60,44%; 118,42%; dan 113,54%. Hasil penelitian ini menunjukkan bahwa katalis NaOH berpengaruh terhadap rendemen hasil sintesis.Kata Kunci: 2,5-bis((E)-3,4-dimetoksibenziliden)siklopentan-1-on, kondensasi Claisen- schmidt, metode MAOSOptimization of Sodium Hydroxide catalyst concentration in the synthesis of 2,5-bis((E)-3,4-dimethoxybenzylidene)cyclopentan-1-one Abstract: This study aimed to synthesize the compound 2,5-bis((E)-3,4-dimethoxybenzylidene) cyclopentan-1-one with varying molar quantities of NaOH catalyst and to determine the yield of the synthesized (2E,5E)-2,5-bis(3,4-dimethoxybenzylidene) cyclopentanone. The synthesis was carried out by reacting 5 mmol of cyclopentanone and 10 mmol of veratraldehyde using NaOH catalyst in amounts of 5, 10, 15, and 20 mmol, with ethanol as the solvent. The synthesis process involved Claisen-Schmidt condensation via microwave-assisted organic synthesis for 60 seconds. The synthesized products were characterized using TLC and TLC scanner, FTIR, and ^1H-NMR. The results revealed that the synthesized compound was a yellow powder, and the characterization confi rmed it as the target compound, (2E,5E)-2,5-bis(3,4-dimethoxybenzylidene) cyclopentanone. The yields of (2E,5E)-2,5-bis(3,4-dimethoxybenzylidene) cyclopentanone obtained with NaOH catalyst amounts of 5, 10, 15, and 20 mmol were 71.75%, 60.44%, 118.42%, and 113.54%, respectively. These fi ndings indicate that the amount of NaOH catalyst signifi cantly aff ects the yield of the synthesis. Keywords: (2E,5E)-2,5-bis(3,4-dimethoxybenzylidene)cyclopentanone, Claisen-schmidt condensation, MAOS method
Study of visual comfort in the library building based on the value of light intensity inside the room Rasa, Barem Talang; Sativa, Sativa
Jurnal Penelitian Saintek Vol 29, No 1 (2024)
Publisher : Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/jps.v1i1.72245

Abstract

This study aimed to assess the adequacy of light intensity levels in the Sragen District Library building against the standards set by SNI 03–6197–2011. The observation process began with a review of relevant lighting theories, followed by an assessment of the library spaces, field testing involving the measurement of room dimensions, and light intensity readings. The library was divided into three zones: storage, reading, and circulation. Measurement points within these zones were determined based on SNI 16–7062–2004, and light intensity was measured using a luxmeter. The results indicate that the area of openings in the building is 27.3%, which is outside the ideal range specified by SNI (10%-20%). The average light intensity in the circulation zone at 08:30 WIB is 958 Lux, while at 10:30 and 12:30 WIB, it is 118 Lux and 67 Lux, respectively. In the reading zone, the average light intensity at 08:30, 10:30, and 12:30 WIB is 218 Lux, 207 Lux, and 202 Lux, respectively. For the storage zone, the average light intensity at 08:30, 10:30, and 12:30 WIB is 119 Lux, 78 Lux, and 77 Lux, respectively. Observations reveal that none of the measured values meet the SNI standard of 300 Lux.
Pengaruh campuran limbah pada pupuk organik cair terhadap dinamika populasi serangga hama kacang tanah Cahyaningrum, Ratna Dwi; Suhartini, Suhartini
Jurnal Penelitian Saintek Vol 29, No 1 (2024)
Publisher : Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/jps.v1i1.63897

Abstract

Penelitian ini bertujuan untuk mengetahui jenis serangga hama yang ditemukan pada tanaman kacang tanah dan pengaruh campuran limbah sayur, buah, kotoran ternak pada pupuk organik cair terhadap dinamika populasi serangga hama tanaman kacang tanah (Arachis hypogaea L.). Penelitian ini menggunakan Rancangan Acak Lengkap dengan 6 perlakuan. Serangga hama diidentifi kasi hingga pada tingkat famili. Data yang diperoleh dianalisis menggunakan analisis deskriptif yang meliputi indeks keanekaragaman, indeks kemerataan, indeks dominansi, indeks kekayaan. Hasil penelitian menunjukkan bahwa didapatkan 10 famili serangga hama tanaman kacang tanah. Nilai indeks keanekaragaman Shanoon-wiener tertinggi pada perlakuan P5 yaitu (0,911) sedangkan secara keseluruhan termasuk kategori rendah. Pupuk organik cair dari variasi campuran limbah buah, sayur, dan kotoran ternak sebagai perlakukan ini tidak memberikan pengaruh yang efektif terhadap dinamika populasi serangga hama pada tanaman kacang tanah.Kata kunci: dinamika populasi, kacang tanah, serangga hamaEffect of waste mixture in liquid organic fertilizer on population dynamics of peanut insect pests Abstract: This study aimed to identify the types of insect pests found on peanut plants and to assess the impact of a mixture of vegetable and fruit waste, along with manure, in liquid organic fertilizer on the dynamics of insect pest populations in peanut plants (Arachis hypogaea L.). A Completely Randomized Design with 6 treatments was employed for this research. Insect pests were identifi ed to the family level. The data were analyzed using descriptive statistics, including diversity index, evenness index, dominance index, and richness index. The results reveal that 10 families of insect pests were identifi ed on peanut plants. The highest Shannon Wiener diversity index value was observed in treatment P5, with a value of 0.911, while the overall index fell into the low category. The liquid organic fertilizer made from various mixtures of fruit and vegetable waste, and manure did not show an eff ective impact on the dynamics of insect pest populations on peanut plants. Keywords: population dynamics, peanut, insect pests
Pengaruh konsentrasi asam sulfat pada sintesis nanokristal selulosa bonggol jagung Maulidanti, Nadiyya Nur; Nurdin, Abdul Malik; Luthfiyah, Ai Fifih; Senania, Astri
Jurnal Penelitian Saintek Vol 29, No 1 (2024)
Publisher : Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/jps.v1i1.67993

Abstract

Penelitian ini bertujuan untuk mengidentifi kasi pengaruh asam sulfat pada sintesis nanokristal selulosa dari bonggol jagung. Isolasi selulosa dari bonggol jagung dilakukan dengan dua tahap yaitu delignfi kasi yang dengan menggunakan NaOH dan bleaching dengan NaOCl. Sintesis nanokristalin selulosa dilakukan dengan menggunakan metode hidrolisis asam sulfat dengan variasi konsentrasi pada suhu 45℃ selama 120 menit. Nanokristalin yang diperoleh dikarakterisasasi nilai kristalinitas dan ukuran kristal menggunakan analisis XRD dan identifi kasi gugus fungsi dengan menggunakan FTIR. Hasil penelitian menunjukan asam sulfat dapat mempengaruhi hasil sintesis dengan teridentifi kasi adanya gugus S=O pada permukaan karena adanya perekatan gugus dari H2 SO4 . Nilai kristalinitas selulosa terbesar diperoleh pada konsentrasi asam sulfat 60% menghasilkan nanokristal selulosa dengan nilai kristalinas sebesar 89,63%, sedangkan ukuran nanokristal terkecil (0,88 nm) dapat diperoleh pada konsentrasi 55%.Kata Kunci: bonggol jagung, hidrolisis asam, nanokristal selulosaEffect of sulfuric acid concentration on the synthesis of cellulose nanocrystals of corncob Abstract: This study aimed to identify the eff ect of sulfuric acid on the synthesis of cellulose nanocrystals from corn cob. Cellulose isolation from corn cob was carried out in two stages: delignifi cation using NaOH and bleaching with NaOCl. Cellulose nanocrystals were synthesized using sulfuric acid hydrolysis with varying concentrations at 45°C for 120 minutes. The obtained nanocrystals were characterized for crystallinity and crystal size using X-ray diff raction (XRD) analysis, and functional groups were identifi ed using Fourier-transform infrared spectroscopy (FTIR). The results indicate that sulfuric acid aff ects the synthesis outcome, as evidenced by the presence of S=O groups on the surface due to the bonding of H2SO4 groups. The highest cellulose crystallinity was achieved at a sulfuric acid concentration of 60%, resulting in cellulose nanocrystals with a crystallinity value of 89.63%. The smallest nanocrystal size (0.88 nm) was obtained at a concentration of 55%. Keywords: corn cob, acid hydrolysis, nanocrystaline cellulose

Page 27 of 29 | Total Record : 286

 25   26   27   28   29 

Filter by Year

2001 2025


Reset
Filter By Issues
All Issue Vol 30, No 2 (2025) Vol 30, No 1 (2025) Vol 29, No 2 (2024) Vol 29, No 1 (2024) Vol 28, No 2 (2023) Vol 28, No 1 (2023) Vol 27, No 2 (2022) Vol 27, No 1 (2022) Vol 26, No 2 (2021) Vol 26, No 1 (2021) Vol 25, No 2 (2020) Vol 25, No 1 (2020) Vol 24, No 2: Oktober 2019 Vol 24, No 1: April 2019 Vol 23, No 1 (2018): April 2018 Vol 23, No 2: Oktober 2018 Vol 22, No 2: Oktober 2017 Vol 22, No 1: April 2017 Vol 21, No 2: Oktober 2016 Vol 21, No 1: April 2016 Vol 20, No 2: Oktober 2015 Vol 20, No 1: April 2015 Vol 19, No 2: Oktober 2014 Vol 19, No 1: April 2014 Vol 18, No 2: Oktober 2013 Vol 18, No 1: April 2013 Vol 17, No 1: April 2012 Vol 16, No 2: Oktober 2011 Vol 16, No 1: April 2011 Vol 15, No 2: Oktober 2010 Vol 15, No 1: April 2010 Vol 14, No 1: April 2009 Vol 13, No 1: April 2008 Vol 12, No 2: Oktober 2007 Vol 12, No 1: April 2007 Vol 11, No 1: April 2006 Vol 10, No 2: Oktober 2005 Vol 10, No 1: April 2005 Vol 9, No 1: April 2004 Vol 8, No 2: Oktober 2003 Vol 8, No 1: April 2003 Vol 7, No 2: Oktober 2002 Vol 7, No 1: April 2002 Vol 6, No 1: Saintek 2001 More Issue