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INDONESIA
IJOBI
Published by Universitas Negeri Yogyakarta
ISSN : 30320216     EISSN : 30320194     DOI : https://doi.org/10.21831
Core Subject : Science, Agriculture, Social,
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Environmental Science Immunology & microbiology Neuroscience
This journal publishes manuscripts of research articles and studies related to Biology including Zoology, Botany, Genetics, Microbiology, Ecology, and Applied Biology.
Arjuna Subject : Ilmu Pertanian dan Biologi (Semua) - Ilmu Pertanian dan Biologi (Lain-Lain)
Articles 15 Documents
 1   2 
ZOOPLANKTON COMMUNITY STRUCTURE IN THE RAINY SEASON AS A BIOINDICator OF WATER QUALITY IN NAMBERAN TELAGA GUNUNGKIDUL DISTRICT Nurrahmantyo, Guntang; Sudarsono
Indonesian Journal of Bioscience (IJOBI) Vol. 2 No. 1 (2024): Indonesian Journal of Bioscience (IJOBI)
Publisher : Universitas Negeri Yogyakarta in collaboration with Perhimpunan Biologi Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/ijobi.v2i1.617

Abstract

This research aims to determine: (1) The structure of the zooplankton community in Telaga Namberan, Gunungkidul Regency, (2) The chemical and physical conditions of the waters in Telaga Namberan, Gunungkidul Regency, (3) The relationship between the structure of the zooplankton community and water quality in Telaga Namberan, Regency Gunungkidul. This research is exploratory research with observational research methods. Sampling was carried out at 6 stations 2 times with 3 repetitions. The research results show that the abundance value is 16216.56 - 877388.54 ind/L, meaning it is classified as water with high nutrient levels. The average dominance value of 0.495 means that the community structure is in a stable condition. The average diversity value is 1.098, meaning that the number of individuals of each species is relatively evenly distributed with fairly stable water conditions. The average evenness value is 0.501, meaning it has even species and the community is relatively stable. Frequency of attendanceCyclopssp., Nauplius sp., Notholca sp 1 always appear at all stations because they can adapt and fit to live in the environment.
FISH SAUCE FERMENTATION OF SKIPJACK FISH (Katsuwonus pelamis L.) AT VARIOUS INCUBATION TIMES AND CONCENTRATIONS OF CRUDE PAPAIN ENZYME Wiyati, Retno; Ariyanti, Nur Aeni
Indonesian Journal of Bioscience (IJOBI) Vol. 2 No. 1 (2024): Indonesian Journal of Bioscience (IJOBI)
Publisher : Universitas Negeri Yogyakarta in collaboration with Perhimpunan Biologi Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/ijobi.v2i1.618

Abstract

This study aims to determine the differences in variations of crude papain enzyme concentration and optimal fermentation time on the microbiological quality of skipjack tuna (Katsuwonus pelamis L.) fish sauce. This research is an experimental study with two variables: 2 different enzyme concentrations (5% and 10%) and 3 different periods (3, 7 and 11 days). The microbiological tests include the Escherichia coli contamination test, total microbial test, and total lactic acid bacteria test. Physical tests include water content tests, pH tests, and organoleptic tests. The results showed that the enzyme concentration and fermentation time affected the microbiological quality of skipjack tuna sauce. The sample with an enzyme concentration of 10% and a fermentation time of 11 days was the best sample of skipjack tuna fish sauce because no E. coli bacteria were found (negative), the total BAL test result was 8.2 x 103 cfu/mL, and the TPC result was 7.1 x 103 cfu/mL which meets SNI standards for Fish Sauce No. 01-4271-1996. This sample also had the best organoleptic test results: a non-fishy aroma, savory taste, and dark brown color. Based on the pH test, samples with enzyme concentrations of 5% and 10% and a fermentation time of 3 days have a pH value that meets the requirements, namely 5.88 (pH requirement 5-6). The results of the water content test showed that all samples did not meet the standards.
IN VITRO INDUCTION OF CALLUS ON AGLAONEMA "BUTTERFLY" LEAVES WITH A COMBINATION OF 2,4-D AND BAP Ardhika Ratri, Jessie; Ratnawati
Indonesian Journal of Bioscience (IJOBI) Vol. 2 No. 1 (2024): Indonesian Journal of Bioscience (IJOBI)
Publisher : Universitas Negeri Yogyakarta in collaboration with Perhimpunan Biologi Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/ijobi.v2i1.619

Abstract

This research aims to determine the effect of variations and the concentration level of 2,4-D in a medium containing BAP which gives the best for callus formation on Aglaonema Butterfly in vitro. This research is an experimental study using 2,4-D (ppm; 0.5 ppm; 1 ppm; 2 ppm; 4 ppm) and 1.2 ppm BAP. Explants were taken from young leaves of the 2nd and 3rd Aglaonema Butterfly from the shoots, with the size of the explants being 1 x 2 cm. The parameters observed were callus emergence time, the percentage of explants forming callus, the average callus size, the rate of surviving explants, and the level of explant browning. The variation of 2,4-D in a medium containing BAP affected the callus emergence time, the percentage of explants forming callus, and the average of Aglaonema Butterfly callus size. The best treatment was at a concentration 2 ppm 2,4-D + 1.2 ppm BAP concentration at 4 weeks after planting, with 50% of explants forming callus, the average callus size was 0.82 mm, live explants were 87.5%, and the lowest browning rates.
THE EFFECTIVITY OF EM4 MADE FROM BACTERIA Bacillus sp. FOR COMPOSTING HOUSEHOLD WASTE AND ON THE GROWTH OF CAYENNE PEPPER PLANT (Capsicum frutescens L) Saputri, Maulin Otto; Suhandoyo, Suhandoyo
Indonesian Journal of Bioscience (IJOBI) Vol. 2 No. 1 (2024): Indonesian Journal of Bioscience (IJOBI)
Publisher : Universitas Negeri Yogyakarta in collaboration with Perhimpunan Biologi Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/ijobi.v2i1.620

Abstract

This study aims to determine the influence of differences in EM4 dosage made from Bacillus sp. and cow dung against composting household waste, to find the best dose to speed up household waste composting, and to test the resulting compost on the growth of cayenne pepper plants (Capsicum frutescens L). This is a 2-stage experiment. The first stage is the effectiveness of composting using a Completely Randomized Factorial design, and the second stage is a biological test by looking at the growth of chili plant seeds using a Completely Randomized Design. The object of this research is household waste that has not undergone decomposition, incubated in the same tub with 4 different dosage levels ( 0%, 5%, 10%, and 15%), and 3 different treatments with cow dung (1:2 and 1:4). Each treatment was repeated 3 times. This treatment lasted 41 days, followed by the second stage, where the resulting compost was used for cayenne pepper. Each treatment was carried out 5 times over 15 days with 4 observations. The parameters observed were the physical results of the compost (color, odor, and structure), temperature, composting pH, plant height, number of leaves, wet weight, and dry weight of cayenne pepper plants. Data were analyzed descriptively in stages one and two using One-way ANOVA, then continued with the Duncan Multiple Range Test (DMRT). The results showed that using EM4 made from Bacillus sp. mixed with cow dung affects the quality of the composting results. The optimal concentration for making household waste fertilizer is 10%. Household waste fertilizer significantly affects the growth of cayenne pepper plants, as seen from all observation parameters, namely plant height, number of leaves, fresh weight, and dry weight.
INHIBITION OF MANGKOKAN LEAF (Nothopanax scutellarium Merr.) ETHANOL EXTRACT ON THE GROWTH OF Salmonella typhimurium BACTERIA Sari, Herninda Dhama; Octavia, Bernadetta
Indonesian Journal of Bioscience (IJOBI) Vol. 2 No. 1 (2024): Indonesian Journal of Bioscience (IJOBI)
Publisher : Universitas Negeri Yogyakarta in collaboration with Perhimpunan Biologi Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/ijobi.v2i1.747

Abstract

Typhoid fever is an infectious disease of the digestive tract caused by the bacterium Salmonella typhimurium. Mangkukan leaf (Nothopanax scutellarin Merr.) can be an alternative treatment because it contains flavonoids, saponins, tannins, and alkaloids. This study aimed to determine the ability of Mangkukan leaf extract as an antibacterial in inhibiting the growth of S. Typhimurium bacteria. This study used a factorial completely randomized design consisting of two factors, namely the concentration of the extract and the age of the inoculum with 4 repetitions. The concentration of the extract used was 5%, 10%, 20%, 40%, and 80%, equipped with the positive control (chloramphenicol), and negative control (aqua dest), while the age of the inoculum was based on the growth phase of the test bacteria, namely 3 hours, 6 hours, 18 hours. hours, and 24 hours. Antibacterial activity testing was carried out using the Disc Diffusion method (Kirby-Bauer Test). The test concentrations of 5%, 10%, 20%, 40%, and 80% test concentrations resulted in inhibition zone diameters of 3.41 mm, 5.4 mm, 6.04 mm, 7.43 mm, and 9.48 mm, respectively. The 80% concentration of ethanol extract from the kukukan leaf was effective in inhibiting the growth of S. typhimurium bacteria with an antibacterial effectiveness value of 60.81%.

Page 2 of 2 | Total Record : 15

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