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All Journal JBIO: jurnal biosains (the journal of biosciences) BIOLINK (Jurnal Biologi Lingkungan, Industri, Kesehatan) Jurnal Pembelajaran dan Biologi Nukleus Jurnal Ilmiah Biologi UMA (JIBIOMA) JURNAL BIOLOGI PAPUA
Riyanto Riyanto
Universitas Medan Area
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Education Environmental Science Immunology & microbiology Languange, Linguistic, Communication & Media Materials Science & Nanotechnology Medicine & Pharmacology

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OBSERVASI PRODUKSI TANDAN BUAH SEGAR PADA PERKEBUNAN SAWIT RAKYAT Riyanto Riyanto
BIOLINK (Jurnal Biologi Lingkungan Industri Kesehatan) Vol 1, No 1 (2014): Agustus
Publisher : Universitas Medan Area

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31289/biolink.v1i1.719

Abstract

The objective of this observation is to understand the trendof  oil palm fresh fruit bunches  (FFB)within one year and to observe the oil palm yield potential of  small holder. The observation was held in one of small holder plantation located in Desa Sonomartani, Kecamatan Sukarame, Kabupaten Labuhan Batu Utara (north Sumatra). The palms were planted in shallow peat. The seedlings were assuming coming from illegitimate seeds. In general, like any other small holder palms, the farm was not well managed such as manuring was only applied ones per year with dosage 0.5 kg Urea.  Weeding in palm circle and inter row is not totally cleaned.  The observation was done during January to December 2013. The number of palms sampled is 238 palms or more or less one hectare.  The stand trees in the area is 140 palms/ha. Average bunch weight during observation is average on 13 kg. Based on the observation, the trend of one year production was tent to distribute nearly in normal distribution.The yield potential is 21.8 ton FFB /ha/year. However, the actual yield was only around 9.9 ton FFB/ ha/ year. This actual production is still far lower from their potency.  In order the yield achieve their potential, herewith some recommendation (i) The seeds planted much be certified seeds bought  from legal seed producer, (ii), weeding must be done properly in which palm circle, harvesting path and inter-row must be free from any weed, (iii) manuring program must be correct dose, type, time and application.  Drainage must be maintained to avoid water lagging. The palms are also must be kept from any pest & Disease attack and thief.
KONTAMINASI BAHAN PLASTIK PADA JAJANAN PASAR (GORENGAN) YANG BEREDAR DI KOTA MEDAN Dita Sari; Riyanto Riyanto; Abdul Karim
BIOLINK (Jurnal Biologi Lingkungan Industri Kesehatan) Vol 4, No 1 (2017): Agustus
Publisher : Universitas Medan Area

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31289/biolink.v4i1.962

Abstract

This reseach aims to know the contamination of plastic materials that exist in market snacks (fried banana, fried tempe, fried tofu and bakwan goreng) that circulated in Medan City. This research uses the method of "Qualitative Description" that is by checking the plastic content in market snacks (gorengan) circulating in Medan City. The results of this study contained 12 positive samples contaminated with plastic materials and 48 samples were not contaminated with plastic materials. Plastic contaminated samples are tested by burning, if positive samples containing plastics will burn and a large flame is visible, black droplets and smell of burning plastic.
The existence of Genus Selaginella in Gunung Sibuatan Area, The Nagalingga's Village of Karo District, North of Sumatera|| Keberadaan Selaginella di Kawasan Gunung Sibuatan Desa Nagalingga Kecamatan Merek kabupaten Karo Sumatera Utara Jamilah Nasution; Riyanto Riyanto
JURNAL PEMBELAJARAN DAN BIOLOGI NUKLEUS (JPBN) Vol 7, No 2 (2021): Jurnal Pembelajaran Dan Biologi Nukleus September 2021
Publisher : Fakultas Keguruan dan Ilmu Pendidikan Universitas Labuhanbatu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36987/jpbn.v7i2.2039

Abstract

The Mount Sibuatan area is located in Mark District, Karo Regency, North Sumatra. Selaginella which is located in the Mount Sibuatan area is at an altitude of 1550 mdpl-2236 mdpl which has high enough humidity which is a suitable habitat for Selaginella to grow. The purpose of this study was to identify the type of Selaginella found in the Mount Sibuatan area, Brand District, Karo Regency, North Sumatra. The research method used is descriptive with sampling using target sampling with exploratory techniques. The results of the study found 4 species consisting of; Selaginella intermedia (terrestrial, erect, creeping), Selaginella subalpina (terrestrial, erect), Selaginella opaca (terrestrial, epilytic, creeping) and Selaginella s.p (terrestrial, epilytic, creeping). The highest species abundance of Selaginella found were Selaginella Intermedia, this species found at an altitude of 1550 m above sea level, with environment of pH level 5.4 and temperature of 18°C. Selaginella subalpina that as the lowest abundance found at an altitude of 1550 meters above sea level, with environment of pH level 7.0 and temperature of 18°C.Kawasan Gunung Sibuatan berada pada Kecamatan Merek Kabupaten Karo, Sumatera Utara. Selaginella yang berada di kawasan Gunung Sibuatan berada di ketinggian 1550 mdpl- 2236 mdpl yang memiliki kelembapan cukup tinggi yang merupakan habitat yang cocok sesuai dengan pertumbuhan Selaginella. Tujuan dari penelitian ini untuk mengetahui jenis-jenis Selaginella yang berada di kawasan Gunung Sibuatan Kecamatan Merek Kabaputen Karo, Sumatera Utara. Metode penelitian yang digunakan yaitu deskriptif dengan pengambilan sampel dengan menggunakan purposive sampling dengan tekhnik ekplorasi. Hasil penelitian ditemukan 4 jenis terdiri dari; Selaginella Intermedia (teresterial tegak, menjalar), Selaginella subalpina (teresterial. tegak), Selaginella opaca (teresterial, epilitik, menjalar), dan Selaginella sp (teresterial, epilitik, menjalar).
UJI TOKSISITAS (LC50 – 24 JAM) EKSTRAK KULIT JENGKOL Pithecellobium jiringa) TERHADAP LARVA UDANG Artemia salina Leach Indah Sinaga; Rosliana Rosliana; Riyanto Riyanto
JBIO: jurnal biosains (the journal of biosciences) Vol 4, No 2 (2018): Jurnal Biosains
Publisher : Universitas Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24114/jbio.v4i2.10473

Abstract

The objective of this experiment is to determine the amount of toxicity leves (LC50–24 jam) peel extrack Jengkol (Pithecellobium jiringa) against larvae of the Artemia salina. The observation method consists of three stages : Observasi, Eksploratory, Full scale test. The concentrations used in the observation were 0%, 5%, 10%, and 15%. In the Eksploratory stateg, the concentrations used were 0%, 1%, 3%, 5%, 7%, and 9%. And for the Full scale test concentrations used were 0%, 4%, 4,5%, 5%, 5,5%, and 6%. The result of toxicity test (LC50–24 jam) peel extrack of Jengkol (Pithecellobium jiringa) showed that the optimum dose is 5,5% whic has mortality 51.1% to the larvae of the Artemia salina.
Pengaruh Ekstrak Daun Salam (Syzygium polyanthum) sebagai Pengawet Alami Daging Ayam Nur Azlin Siregar; Riyanto Riyanto; Dewi Nur Anggraeni
Jurnal Ilmiah Biologi UMA (JIBIOMA) Vol 3, No 2 (2021): November
Publisher : Universitas Medan Area

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31289/jibioma.v3i2.735

Abstract

Daging ayam merupakan bahan makanan yang memiliki kandungan protein dan air yang tinggi, yang cepat mengalami pembusukan. Daun salam merupakan salah satu bahan alami karena dapat digunakan sebagai pengawet karena mengandung minyak atsiri, air, tanin, dan flavonoid yang dapat mencegah bakteri patogen penyebab pembusukan makanan. Ibu rumah tangga sering menggunakan daun salam untuk mengawetkan unggas, yang kerapatan ekstrak dan waktu perendamannya tidak diketahui. Parameter yang diamati adalah kombinasi warna, tekstur dan rasa ayam. Untuk perlakuan ayam digunakan ekstrak daun salam (Cygizium polyanthemum) dengan konsentrasi 0%, 20%, 40%, 60%, 80% dan 100%, dan perlakuan diulang 4 kali selama 1 jam, 2 jam, dan 3 jam. . Berdasarkan hasil penelitian dapat disimpulkan bahwa perlakuan yang paling efektif digunakan sebagai pengawet alami unggas adalah perendaman dalam konsentrat ekstrak 60% selama 2 jam
Penentuan Kadar Kalium Iodat (KIO3) dalam Garam Konsumsi yang Beredar Dipasaran dengan Metode Iodometri Muthiah Muthiah; Rosliana Lubis; Riyanto Riyanto
Jurnal Ilmiah Biologi UMA (JIBIOMA) Vol 2, No 1 (2020): Mei 2020
Publisher : Universitas Medan Area

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (300.021 KB) | DOI: 10.31289/jibioma.v2i1.186

Abstract

Potassium iodide is one of the substances that must be present in iodized salt. The purpose of this research was to determine the level of KIO3 in consumption salts that are circulating in the market by iodometry method based on Indonesia National Standart 01-3556-2016. The results of the reseacrh showed that of the 15 salt sampels, it turns out that 8 salt samples of KIO3 levels meet the SNI standard, which is 30 – 80 ppm, while 7 salt sampels did not meet the SNI Standard. For 7 salt sampels that did not meet SNI standard after testing the moisture content, sodium chloride content and cadmium contamination, only 3 salt sampels of water content meet the SNI standard and 4 sampels of water content did not meet it.For testing the levels of sodium chloride and cadmium contamination, it has met SNI standards.
INVENTARISASI LYCOPODIACEAE di KAWASAN TAMAN WISATA ALAM SICIKE-CIKEKABUPATEN DAIRI SUMATERA UTARA Nurhaika br Hutajulu; Riyanto riyanto; Jamilah Nasution
Jurnal Ilmiah Biologi UMA (JIBIOMA) Vol 2, No 2 (2020): November
Publisher : Universitas Medan Area

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31289/jibioma.v2i2.315

Abstract

Taman Wisata Alam (TWA) Sicike-Cike merupakan hutan hujan tropis dataran rendah,  umumnya hutan dengan dataran rendah banyak dijumpai tumbuhan paku. Penelitian ini bertujuan untuk mengetahui jenis-jenis tumbuhan paku yang tergolong ke dalam famili Lycopodiaceae yang berada di Kawasan Taman Wisata Alam Sicike-Cike Kabupaten Dairi Sumatera Utara. Metode penelitian yang digunakan dalam penelitian ini adalah metode deskriptif dengan teknik eksplorasi. Teknik pengambilan sampel secara sengaja (purposive sampling) dengan menjelajahi Kawasan Taman Wisata Alam Sicike-Cike. Hasil penelitian diperoleh 7 jenis Lycopodiaceae yang terdiri dari : Lycopodium clavatum (5 Populasi), Lycopodium hamiltonii (4 Populasi), Lycopodium cernuum (8 Populasi), Lycopodium squarrosum (39 populasi), Lycopodium sp1 (5 Populasi), Huperzia ribourtii (4 Populasi) and Huperzia phlegmaria (16 Populasi).
ANALISIS KANDUNGAN KARBON PADA DAUN MANGROVE Rhizophora apiculata di KAMPUNG NIPAH KECAMATAN PERBAUNGAN KABUPATEN SERDANG BEDAGAI SUMATERA UTARA Roswita Raya Hasibuan; Emmy Harso Kardhinata; Riyanto Riyanto
Jurnal Ilmiah Biologi UMA (JIBIOMA) Vol 2, No 2 (2020): November
Publisher : Universitas Medan Area

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31289/jibioma.v2i2.260

Abstract

Analisis Kandungan Karbon Pada Daun Mangrove Rhizophora apiculata di Kampung Nipah Kecamatan Perbaungan Kabupaten Serdang Bedagai Sumatera Utara. Bertujuan untuk mengetahui nilai kandungan karbon yang tersimpan pada daun Rhizophora apiculata. Penelitian ini menggunakan metode deskriptif yaitu memberikan gambaran mengenai situasi atau kejadian suatu kawasan. Teknik pengambilan sampel yang digunakan adalah  purposive  random  sampling  yaitu  pengambilan  sampel  dengan  pertimbangan tertentu. Dari hasil penelitian diperoleh kandungan karbon pada daun dengan diameter batang 7-9 cm yaitu : 41,85% dan pada diameter batang 5-6 cm sebesar 24,07%. Hal ini menyatakan daun belum maksimal dalam menyerap karbon.
Pengaruh Konsentrasi Air Kelapa dan Air Cucian Beras dan Lama Perendaman Terhadap Perkecambahan Benih Kacang Hijau (Vigna radiata L.) Srimaulinda Srimaulinda; Kiki Nurtjahja; Riyanto Riyanto
Jurnal Ilmiah Biologi UMA (JIBIOMA) Vol 3, No 2 (2021): November
Publisher : Universitas Medan Area

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31289/jibioma.v3i2.751

Abstract

Air kelapa adalah senyawa alami kompleks yang sering digunakan sebagai pengatur tumbuh alami.   Penggunaan air kelapa sebagai bahan organik merupakan alternatif dari penggunaan bahan sintetis pada tanaman. Tujuan penelitian ini adalah untuk mengetahui pengaruh konsentrasi limbah dalam air kelapa dan air cucian beras serta lama perendaman terhadap perkecambahan biji kacang hijau. Parameter yang diamati adalah tinggi globul, jumlah radikula, dan panjang radikula. Berdasarkan hasil penelitian, air kelapa dan air cucian beras berpengaruh terhadap tinggi bulu dimana bulu tertinggi terdapat pada kombinasi (20 ml air kelapa + 80 ml air cucian beras dan perendaman 2 jam). Panjang radikula terpanjang ditemukan pada kombinasi (10 ml air kelapa + 90 ml air cucian beras dan perendaman 6 jam). Jumlah akar paling banyak terdapat pada kombinasi (50 ml air kelapa + 50 ml air cucian beras dan perendaman 6 jam).
Uji Efektivitas Cendawan Metarhizium anisopliae Terhadap Daya Bunuh Instar 2 Dan Instar 4 Larva Ulat Spodoptera Litura Pada Tanaman Sawi Hijau (Brassica juncea L.) Di Laboratorium One May Sunday Nababan; Sartini Sartini; Riyanto Riyanto
Jurnal Ilmiah Biologi UMA (JIBIOMA) Vol 2, No 1 (2020): Mei 2020
Publisher : Universitas Medan Area

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (332.451 KB) | DOI: 10.31289/jibioma.v2i1.184

Abstract

Pests are one of the factors that reduce the production and quality of cultivated plants, for example grayak caterpillars (Spodoptera litura) which attack mustard plants. Grayak caterpillars (Spodoptera litura) can be controlled using chemical compounds (insecticides), can be manually collected by hand and can also be biologically controlled, for example with mushrooms. The purpose of this study was to examine the effectiveness of the fungus Metarhizium anisopliae on Spodoptera litura caterpillar larvae in green mustard plants (Brassica juncea L.). The caterpillar used in this study is the Instar-2 (I₁) and Instar-4 (I₂) phase caterpillars. The concentration of fungi was inoculated were 10-2 (M₁), 10 -4 (M₂), and 10 -6 (M₃), and without fungi as a control (M₀). The design used was Factorial RAL with 3 replications. The experimental results showed that spore density M₁, M₂, and M₃ were quite effective at killing the caterpillar both on instar-2 (I₁) and on instar-4 (I₂
Co-Authors Abdul Karim Bela Yustika Chairunnisa Chairunnisa Dewi Nur Anggraeni Diana Sari Dita Sari Emmy Harso Kardhinata Faisal Amri Tanjung Guspi Wilda Sari Sianipar Hanifah Mutia Zaida Ningrum Amrul Indah Sinaga KIKI NURTJAHJA M.Yusri Dadan Nugraha Maisarah L. Gaol Muthiah Muthiah Nasution, Jamilah Nur Azlin Siregar Nurhaika br Hutajulu One May Sunday Nababan Rosliana Lubis Rosliana Rosliana Roswita Raya Hasibuan Sartini Sartini Srimaulinda Srimaulinda