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Roni Koneri
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Jurusan Biologi FMIPA Universitas Sam Ratulangi
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Jurnal Bios Logos
Published by Universitas Sam Ratulangi
ISSN : 20889569     EISSN : 26563282     DOI : https://doi.org/10.35799/jbl.11.2.2020.28153
Core Subject : Health, Science, Agriculture,
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Immunology & microbiology Medicine & Pharmacology
JURNAL BIOS LOGOS is the journal published by Department of Biology, Faculty of Mathematics and Natural Sciences, Sam Ratulangi University. The aims of the journal are to publish original research papers and article review in biology science i.e. botany, zoology, molecular biology, microbiology, ecology, diversity and conservation, taxonomy and biogeography. BIOS LOGOS is published two times per year (February and August)
Arjuna Subject : Ilmu Pertanian dan Biologi (Semua) - Ilmu Pertanian dan Biologi (Lain-Lain)
Articles 3 Documents
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Search results for , issue "Vol. 16 No. 1 (2026): JURNAL BIOS LOGOS" : 3 Documents clear
Relationship Between Soil Density And Soil Organic Carbon Stock In Tembawang Agroforestry Area Of Semayang Village Sanggau Regency Wahyudi, Miki; Rafdinal; Turnip, Masnur
JURNAL BIOS LOGOS Vol. 16 No. 1 (2026): JURNAL BIOS LOGOS
Publisher : Universitas Sam Ratulangi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35799/jbl.v16i1.63676

Abstract

Tembawang agroforestry is composed of tree vegetation that stores abundant carbon reserves both on the surface and in the soil. Soil organic carbon plays a role in increasing soil fertility so that plant productivity and the sustainability of plant life can increase. The purpose of this study was to determine organic carbon content, and organic carbon reserve and their relationship in the Tembawang Agroforestry of Sanggau Regency. This research was conducted from August 2024 to December 2024. Determination of sampling locations using purposive sampling method. Sampling was done at 5 points in each location. Determination of organic carbon content using the Walkey and Black method. Data were analyzed using the SPSS 30 program. The results of this study show that the soil density is 0,6615 g/cm3 to 0,7795 g/cm3. The highest organic carbon content was 7.08% then decreased to 2.89%. Soil organic carbon reserves were 2311,38 ton/ha to 6735,60 ton/ha. Soil density had a week negative correlation with organic carbon content (r = -0,240 < 0,05) and a moderate positive correlation with organic carbon stocks (r = 0,546 < 0,01). Organic carbon content had a strong negative correlation with organic carbon reserves (r = -0,681 < 0,01).  
Characterization of Thelenota ananas and Its Potential as a Natural Source of Antioxidants Budiarso, Fona; Sorisi, Angle; Fatimawali, Fatimawali
JURNAL BIOS LOGOS Vol. 16 No. 1 (2026): JURNAL BIOS LOGOS
Publisher : Universitas Sam Ratulangi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35799/jbl.v16i1.63976

Abstract

The sea cucumber Thelenota ananas, commonly found in tropical waters, possesses significant biological potential. This study aims to assess the antioxidant potential of Thelenota ananas extract obtained from the Manado sea. The simplicia was analyzed for organoleptic properties, moisture content (9.8%), and ash content (23%). Bioactive compounds were identified through color and foam reactions, while antioxidant activity was measured using the DPPH method. The extract was found to contain saponins, terpenoids, and alkaloids. The antioxidant activity of the extract, with an IC50 value of 99.8 ppm, demonstrates strong antioxidant properties, though less potent than the control, vitamin C (IC50 of 45.5 ppm). These findings suggest that while Thelenota ananas extract exhibits substantial antioxidant activity, it is still less effective than vitamin C. This research highlights the potential of Thelenota ananas as a natural antioxidant source for the development of health products.
Density and Functional Role of Zooplankton in The Coastal Waters of Bahu and Meras, North Sulawesi Ali, Sitti Nur Haliszah; Koneri, Roni; Papu, Adelfia
JURNAL BIOS LOGOS Vol. 16 No. 1 (2026): JURNAL BIOS LOGOS
Publisher : Universitas Sam Ratulangi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35799/jbl.v16i1.64781

Abstract

The city of Manado is surrounded by waters with a long coastline. Most of the coastline is used for human activities. These activities include tourist attractions, ports, and trade centres. The sustainability of these sectors is highly dependent on the health of the marine ecosystem. One organism that plays an important role in the aquatic ecosystem is zooplankton. This study aims to calculate the density of zooplankton and analyse its functional role. The method used was exploratory descriptive, which is a research pattern that describes in detail or comprehensively the condition or status of zooplankton phenomena. This study was conducted at Bahu Beach and Meras Beach, North Sulawesi. The density value at Bahu Beach is 307.35 ind/m3 and at Meras Beach is 222.4 ind/m3. Zooplankton identified from two sampling points belonged to the phyla Arthropoda, Foraminifera, Annelida, Mollusca, and Cilliophora. The total number of genera found was 22. There were 1,032 consumer I individuals, 798 consumer II individuals, and 193 consumer III individuals.

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