Faculty of Mathematics and Natural Sciences: Recent submissions
Now showing items 41-60 of 11533
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Isolasi dan Identifikasi Golongan Senyawa Flavonoida dari Kulit Batang Kesambi (Schleichera oleasa (Lour.) Oken)
(Universitas Sumatera Utara, 2026)The isolation and identification of flavonoid compounds from the stem bark of kesambi (Schleichera oleosa (Lour.) Oken) were carried out through several stages. The research process began with maceration extraction using ... -
Pengaruh pH terhadap Derajat Kristalinitas Hasil Sintesis Hidroksiapatit dari Cangkang Kerang Kepah (Polymesoda erosa) dengan Metode Pengendapan Basah
(Universitas Sumatera Utara, 2025)Kepah shell waste (Polymesoda erosa) contains a high calcium oxide (CaO) content of approximately 96.06%, making it a promising calcium source for hydroxyapatite (HAp) synthesis. This study aims to analyze the effect of ... -
Uji Ekstrak Etanol Biji Pepaya (Carica papaya L.) terhadap Daya Tetas dan Perkembangbiakan Larva Aedes aegypti
(Universitas Sumatera Utara, 2025)Dengue Hemorrhagic Fever (DHF), transmitted by Aedes aegypti, remains a major public health problem in Indonesia. This study aimed to determine the effect of papaya seed extract (Carica papaya L.) on egg hatching rate ... -
Sintesis dan Karakterisasi Carbon Dots (CDs) Berbasis Cangkang Biji Karet (Havea brasiliensis) Menggunakan Metode Hidrotermal
(Universitas Sumatera Utara, 2025)Rubber seed shells (Hevea brasiliensis) are agricultural biomass waste that is abundant and has not been optimally utilized. Rubber seed shell biomass can be used as a precursor in the synthesis of Carbon Dots (CDs). CDs ... -
Sintesis dan Karakterisasi Nitrogen Carbon Dots Berbasis Cangkang Biji Karet (Havea brasiliensis) Menggunakan Metode Hidrotermal dengan Variasi Massa Dopan
(Universitas Sumatera Utara, 2025)Carbon Dots (CDs) are zero-dimensional carbon nanomaterials with a size of less than 10 nm that have high fluorescence properties and good stability. Efforts to improve fluorescence efficiency and stability can be done ... -
Sintesis dan Karakterisasi Nanokomposit MoS2/N-Doped Carbon Dots Berbasis Cangkang Biji Karet (Hevea brasiliensis) dengan Metode Sonikasi
(Universitas Sumatera Utara, 2025)Nitrogen-doped Carbon Dots (N-CDs) are nanoscale materials with high fluorescence intensity and large band gap. Molybdenum disulfide (MoS₂) is a semiconductor with a narrow band gap and high visible light absorption capacity. ... -
Pengaruh Suhu Sintering terhadap Kristalinitas Hidroksiapatit yang Disintesis dari Tulang Ikan Lele (Clarias sp.) Melalui Metode Pengendapan Basah
(Universitas Sumatera Utara, 2025)Hydroxyapatite (HAp) was synthesized from catfish (Clarias sp.) bone using the wet precipitation method. The bone composition was analyzed using EDXRF and showed a calcium oxide (CaO) content of 59.42 wt%. Sintering was ... -
Sintesis dan Karakterisasi Nanokomposit Fe3O4/N-Doped Carbon Dots Berbasis Cangkang Biji Karet (Hevea brasiliensis) dengan Metode Sonikasi
(Universitas Sumatera Utara, 2025)Research on biomass-based nanomaterials has the potential to produce environmentally friendly materials with outstanding functional properties. Nitrogen-doped Carbon Dots (N-CDs) are nanomaterials known for their strong ... -
Preparasi Biofilm Antibakteri Berbasis Karboksimetil Selulosa, Selulosa Bakteri Teh Kombucha, Kitosan atau TiO2 dengan Gliserol sebagai Plasticizer
(Universitas Sumatera Utara, 2025)The preparation and characterization of antibacterial biofilms based on carboxymethyl cellulose, bacterial cellulose from kombucha tea, chitosan or TiO₂, with glycerol as a plasticizer, were carried out in this study. ... -
Karakterisasi Kertas Dinding Berbasis Pulp Pinus Merkusii yang Dimodifikasi dengan Variasi Selulosa Bakteri Hasil Fermentasi Teh Kombucha dan Kalsium Karbonat
(Universitas Sumatera Utara, 2025)This research was conducted to produce wallpaper based on natural materials as an alternative to conventional wallpaper made of PVC by utilizing mercury pine pulp as a matrix, bacterial cellulose fermented from kombucha ... -
Analisis Logam Berat Timbal (Pb) pada Daging Kerang Lentera (Lingula unguis) di Desa Jaring Halus, Secanggang, Langkat
(Universitas Sumatera Utara, 2025)This study aims to analyze lead (Pb) concentrations in the meat of Lingula unguis and to compare them with Pb levels in seawater and sediment in the coastal area of Jaring Halus Beach, Secanggang District, Langkat Regency. ... -
Analisis Limbah Karbon Aktif Filter Depot Air Minum sebagai Adsorben untuk Penurunan Logam Besi pada Air Sumur Bor
(Universitas Sumatera Utara, 2025)The limited supply of clean water around the Medan Industrial Area encourages people to use drilled well water which is susceptible to contamination by heavy metal contaminants, especially iron (Fe) which has levels ... -
Optimalisasi Biaya Pendistribusian Menggunakan Metode Stepping-Stone dan (Modified Distribution) Modi
(Universitas Sumatera Utara, 2025)In the era of globalization, the growing market demand has driven significant developments in the service industry, particularly in the field of logistics and delivery services. One of the key challenges in this sector is ... -
Analisis Kandungan Logam Berat Tembaga, Timbal, dan Seng pada Road Dust Resuspension Suspension (RDR-S) di Kawasan Pinang Baris
(Universitas Sumatera Utara, 2025)The development and changes in technology produce emissions, especially from transportation activities that are affected by tire and brake wear, which produce road dust in the form of solid particles, thus triggering air ... -
Hubungan Keberadaan Sarang Orangutan Tapanuli (Pongo tapanuliensis) Dengan Kerentanan Tanaman Budidaya Pada Area Konflik Manusia-Orangutan
(Universitas Sumatera Utara, 2025)The habitat of the Tapanuli orangutan (Pongo tapanuliensis) is limited to the Batang Toru Landscape. The Tapanuli orangutan is threatened with habitat loss due to land-use changes, forcing the orangutans to enter and forage ... -
Isolasi dan Sekuensing Fragmen cDNA Gen pi-ta sebagai Ketahanan terhadap Penyakit Blas pada Padi (Oryza sativa L.) Sigudang dari Sumatera Utara
(Universitas Sumatera Utara, 2026)Blast disease caused by Pyricularia oryzae is one of the main threats to rice production in Indonesia. Several local rice varieties in North Sumatra, including the Sigudang cultivar, showed resistant to blast disease. ... -
Isolasi dan Sekuensing Fragmen cDNA Gen pi-d2 sebagai Ketahanan terhadap Penyakit Blas pada Padi Sigudang (Oryza sativa L.) dari Sumatera Utara
(Universitas Sumatera Utara, 2026)Rice blast disease caused by the fungus Pyricularia oryzae is one of the major threats to rice production. Several resistant genes have been identified to confer resistance against blast disease, including the pi-d2 gene. ... -
Aktivitas Berang-Berang Cakar Kecil (Aonyx cinereus) di Kebun Binatang Rahmat Zoo and Park, Desa Bengabing, Pegajahan, Sumatera Utara
(Universitas Sumatera Utara, 2026)This study aims to examine the activity patterns of small-clawed otters (Aonyx cinereus) maintained at Rahmat Zoo and Park, Bengabing Village, Pegajahan, North Sumatra. From a biological perspective, the study of daily ... -
Aktivitas Walabi Lincah (Macropus agilis papuanus) di Kebun Binatang Rahmat Zoo and Park, Desa Bengabing, Pegajahan, Sumatera Utara
(Universitas Sumatera Utara, 2025)This study aims to analyze the ex situ husbandry system and daily activity patterns of agile wallabies (Macropus agilis papuanus) at Rahmat Zoo and Park, Bengabing Village, Pegajahan, North Sumatra. Observations were ... -
Pembuatan Butil Dekanoat dari Esterifikasi Butanol dan Asam Dekanoat pada Perbandingan Waktu Reaksi dan Daya Microwave Menggunakan Katalis Enzim Lipase
(Universitas Sumatera Utara, 2025)The production of Butyl Decanoate from Butanol and decanoic acid has been carried out through an esterification reaction using lipase enzyme as a catalyst and microwave radiation. The parameters studied in this study were ...