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Kota mataram,
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INDONESIA
Jurnal Biologi Tropis
Published by Universitas Mataram
ISSN : 14119587     EISSN : 25497863     DOI : -
Core Subject : Science, Agriculture,
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Immunology & microbiology
Jurnal Biologi Tropis (ISSN Cetak 1411-9587 dan ISSN Online 2549-7863) diterbitkan mulai tahun 2000 dengan frekuensi 2 kali setahun oleh Program Studi Pendidikan Biologi PMIPA FKIP Universitas Mataram, berisi hasil penelitian dan ulasan Ilmiah dalam bidang Biologi Sains.
Arjuna Subject : -
Articles 2,562 Documents
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The Potential of Indigenous Lactic Acid Bacteria Lactobacillus Plantarum Dad 13 in Ice Cream as Probiotic Food B. R. D Wulandani; D. Kisworo; Bulkaini Bulkaini; W. Yulianto; Haryanto Haryanto
Jurnal Biologi Tropis Vol. 22 No. 4 (2022): October - December
Publisher : Biology Education Study Program, Faculty of Teacher Training and Education, University of Mataram, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jbt.v22i4.4436

Abstract

Worldwide demand for functional food will continue to increase rapidly due to increasing public awareness about the impact of food on health. One example of functional food is milk-based food which contains probiotic bacteria such as yogurt, cheese, and ice cream. Among probiotic dairy products, ice cream is the ideal matrix delivery of probiotic ingredients to the human body. This study aimed to find the potential of L. plantarum dad 13 in ice cream as a probiotic food through the growth pattern of the resulting lactic acid bacteria and to obtain the best incubation time and aging time for the physicochemical properties of the ice cream produced. The experimental design in this study used a Randomized Block Design (RBD), which was arranged in a factorial manner with 2 factors. The first factor is the length of incubation time which consists of 3 levels, namely 0, 5, and 10 hours; and the second factor is the length of aging which consists of 3 levels, namely 24, 48, and 72 hours. The results showed that the viability of lactic acid bacteria in ice cream with the addition of lactic acid bacteria L. plantarum dad 13 was more influenced by the pH value during the aging process, and there was an interaction between the incubation time and the aging time on the viability of the lactic acid bacteria L. plantarum dad 13 in ice cream, as well as the antioxidant activities, produced.
Identification of Bacteria in Fresh Vegetables from The Traditional Market of Mataram City Syamsul Bahri; Rika Ratnasari; Ulfah Nurkhaeroni; Mujitahid Mujitahid
Jurnal Biologi Tropis Vol. 22 No. 4 (2022): October - December
Publisher : Biology Education Study Program, Faculty of Teacher Training and Education, University of Mataram, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jbt.v22i4.4445

Abstract

Indonesia is very rich in potential for vegetable cultivation. Vegetables contain a lot of vitamins and minerals. Therefore, people prefer to eat vegetables in a fresh state either as salads or fresh vegetables. However, contamination of pathogenic bacteria is much greater both at the farmer and trader levels. Therefore this study aims to determine the feasibility of consumption and identify bacteria in fresh vegetables in the traditional market of Mataram City. Samples in the form of lettuce, cucumber, cabbage, and long beans were taken from Pagesangan, Kebon Roek, Gunung Sari, and Bertais markets, respectively. The existence of bacteria were detected using traditional method by inoculating samples in agar cultures followed by biochemical testing and Gram staining. Species of bacteria that can be identified from samples are Enterobacter cloacae, Bhanhamella catarrhalis, E-coli, Staphylococus sapropyticus, and Aeromonas hydrophila. Based on the data, long beans from the Bertais market and lettuce from the Pagesangan, Kebon Roek, and Gunung Sari markets are not suitable for consumption because the TPC yield exceeds the consumption quality standard of 105-106 CFU/g.
Impact Evaluation of the Use of Mercury (Hg) and Cyanide (Cn) in Gold Processing Activities on Lombok Island Based on Knowledge and Experience of Gold Miners and Processers on Lombok Island Hilman Ahyadi; Suripto Suripto; Ahmad Jupri; Immy Suci Rohyani
Jurnal Biologi Tropis Vol. 22 No. 3 (2022): July - September
Publisher : Biology Education Study Program, Faculty of Teacher Training and Education, University of Mataram, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jbt.v22i3.4468

Abstract

The high value and economic prospects of precious metals, have not been able to cover the environmental, health and social and economic impacts. The conversion of land functions and open pit mining activities as well as the amount of sediment waste causes very significant landscape and environmental changes. This study aims to evaluate the impact of using mercury and cyanide based on the knowledge and experience of actors (miners and gold processors) and the surrounding community on the island of Lombok. Field data collection was carried out by triangulation, namely in-depth interviews with actors and the community, and secondary/reference data from related agencies, especially the health center and several related research results. Gold extraction on the island of Lombok uses two methods which are carried out in stages, namely Amalgamation with mercury in the shelling process and Cyanidation with Potassium Cyanide in the bagging process. The results of the study show that the negative impacts of the mining process are more due to land clearing and miner safety. The impact of gold extraction using mercury is long-term, so it is difficult to identify the impact. Meanwhile, the impact of the use of cyanide is directly felt and seen by the public, especially in terms of decreasing the presence and yield of fish caught in rivers and coasts.
Socio-Economic Study of Maize Farming Households in The Buffer Area of Mandalika Special Economic Zone Central Lombok Regency Dudi Septiadi; Rosmilawati Rosmilawati; Abdullah Usman; Asri Hidayati
Jurnal Biologi Tropis Vol. 22 No. 3 (2022): July - September
Publisher : Biology Education Study Program, Faculty of Teacher Training and Education, University of Mataram, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jbt.v22i3.4474

Abstract

The Mandalika Special Economic Zone is one of the priority areas for national economic development that aims to create new sources of economic growth in the region. Maize is a type of food crop that has great potential share in the agricultural sector, especially as fulfillment food needs in the Mandalika Special Economic Zone. The objectives of this study were 1) to analyze the income from maize cultivation in the buffer zone of the Mandalika Special Economic Zone; 2) analyze the perceptions of households producing corn in the buffer zone about the socioeconomic benefits of the existence of the Mandalika Special Economic Zone. The method used in this research is the descriptive method. The respondents in this study were farmers who planted maize in Mertak Village and it was determined that there were 30 respondents who were determined by purposive sampling. The results showed that maize farmers in the buffer zone of Mandalika Special Economic Zone earn income in one growing season with an average income from maize cultivation of IDR 15,392,760/LLG or IDR 13,502,577/ha. Also, maize farmers in the buffer zone of the Mandalika Special Economic Zone benefit from the existence of the Mandalika Special Economic Zone in the form of increasing employment, improving public facilities like; the road infrastructure is of better quality, the physical condition of educational facilities and health facilities is also improving.
Production Efficiency Measurement of Seaweed Cultivation In The Specific Economic Zone of Mandalika, Central Lombok Regency Muhammad Nursan; Syarif Husni; M. Yusuf; Aeko Fria Utama FR; Ni Made Nike Zeamita Widiyanti
Jurnal Biologi Tropis Vol. 22 No. 4 (2022): October - December
Publisher : Biology Education Study Program, Faculty of Teacher Training and Education, University of Mataram, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jbt.v22i4.4506

Abstract

Central Lombok Regency, especially in the Specific Economic Zone (SEZ) Mandalika apart from being a tourism area it is also one of the centers for seaweed cultivation in NTB Province, seaweed cultivation in the SEZ Mandalika, Central Lombok Regency currently still has several problems, one of which is business productivity which is still low. The low productivity of seaweed cultivation can be caused by inefficient allocation of inputs. The aims of this study were: 1) to analyze the factors that affect the production of seaweed aquaculture, 2) to analyze the level of efficiency of the production of seaweed aquaculture, and 3) to analyze the factors that influence the level of technical inefficiency of seaweed cultivation in SEZ Mandalika, Central Lombok Regency. This study uses a descriptive research method with a mixed method research approach. Collecting research data using survey techniques through interviews with respondents as many as 30 people who were taken by accidental sampling. Analysis of the data in this study using the method of Cobb-Douglas stochastic frontier production function to measure the level of production efficiency of seaweed cultivation in SEZ Mandalika, Central Lombok Regency. The results of this study indicate that seaweed production is significantly influenced by the variables of area, seeds, and labour. The level of production efficiency of seaweed cultivation is efficient with a production efficiency value of 0.861. Then the factors that affect the technical inefficiency of seaweed cultivation in Central Lombok Regency include level of education and dummy farmer groups.
Analysis of Malondialdehyde (MDA) Levels Based on Body Mass Index, Waist Circumstances, and Body Fat Percentage in Students of Medicine Program Faculty of Medicine Mataram University Ida Ayu Eka Widiastuti; Fitriannisa Faradina Zubaidi; Basuki Rahmat; Gede Wira Buanayuda
Jurnal Biologi Tropis Vol. 22 No. 4 (2022): October - December
Publisher : Biology Education Study Program, Faculty of Teacher Training and Education, University of Mataram, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jbt.v22i4.4513

Abstract

Obesity can cause chronic oxidative stress. Oxidative stress occurs when the formation of free radicals is greatly increased or the protective antioxidant mechanisms are disrupted. Previous studies have concluded that there is a relationship between oxidative stress and excess body weight and obesity. One of the products of oxidative stress is malondialdehyde (MDA). This study aims to determine the correlation between malondialdehyde (MDA) levels and body mass index (BMI), waist circumference (LP), and body fat percentage. The subjects were 55 students of the Medical Education Study Program, Faculty of Medicine, University of Mataram, class of 2021. The BMI variable was calculated by dividing body weight (kg) by the square of height (m), waist circumference was measured using a tape measure (cm), and body fat percentage measured by body composition monitor (%). Serum MDA levels were measured using the ELISA method. Data were analyzed statistically with the Spearman correlation test. The results showed that the average MDA level in subjects with overweight and obesity was higher than normal, however there was no significant correlation between body mass index, waist circumference, and body fat percentage with MDA levels, with each significance value :p=0.230; p=0.276; and p=0.666. Body mass index, waist circumference, and body fat percentage cannot be ruled out as risk factors for oxidative stress.
Morphological and molecular characters of Lemuru fish (Sardinella lemuru) from Tanjung Luar Waters, East Lombok H. Mahrus; Abdul Syukur; Lalu Zulkifli
Jurnal Biologi Tropis Vol. 22 No. 4 (2022): October - December
Publisher : Biology Education Study Program, Faculty of Teacher Training and Education, University of Mataram, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jbt.v22i4.4555

Abstract

Lemuru fish from the Clupeidae family in various countries have many similarities that are difficult to distinguish between one species and another. This study aims to determine the morphological and molecular characteristics, genetic diversity, and kinship of lemuru fish in Tanjung Luar waters with lemuru fish species in countries. The molecular feature of lemuru fish used in this study was a marker for the cytochrome c oxidase subunit 1 (CO1) gene. The lemuru fish sample used in this study was lemuru caught in the waters of Tanjung Luar by small-scale fishermen. Lemuru fish sampling method using random, totaling 100 individuals. Firstly, the lemuru fish samples were grouped based on morphological characters. Next, segregation and augmentation of the CO1 gene DNA in five lemuru fish samples using a pair of primers. The amplification of DNA about 700 bp in size was sequenced. CO1 gene sequence data of lemuru samples were analyzed using MEGA 11 Software (Molecular Evolutionary Genetics Analysis) Version 11. The phylogenetic relationships obtained showed that the lemuru samples from Tanjung Luar waters, East Lombok, is in the same clade as Sardinella Jussieu from Malaysia and has a very close kinship relationship.
Isolation and Activity Test of Lipolitic Bacteria on Different pH and Temperature Prapti Sedijani; Dewa Ayu Citra Rasmi; Kusmiyati Kusmiyati; Miko Eniarti; Siti Rohimah
Jurnal Biologi Tropis Vol. 22 No. 3 (2022): July - September
Publisher : Biology Education Study Program, Faculty of Teacher Training and Education, University of Mataram, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jbt.v22i3.4552

Abstract

Lipase is an enzyme that can be applied in many industrial fields so it has a good economic prospects. The demand for lipase was still unfulfilled at the time this article was written. The character of the lipase for industrial needs are vary depending on the industry in which the enzyme is used. Temperature and pH are the two factors that most influence enzyme activity. This article reports on bacteria isolated from coconut, avocado, tempeh, and areca nut and their lipolytic activity at pH 7-10, 30-40oC. Isolation was carried out on NA media supplemented with olive oil and Rhodamine B as the activity indicator. Colonies showing clear zones were used in subsequent work. Activity tests were carried out on the isolation medium pH 7-10 and incubated at 30 or 40oC. Characterization of isolates includes morphological and microscopic observations; proteolytic and amylolytic capability. There were 41 isolates showing lipolytic activity, 26, 7, 4, and 4 isolates from coconut, tempeh, avocado, and areca nut, respectively. Five isolates were selected for further work. Activity tests showed that the best isolates at 30oC were K1A1 and K1A2 at pH 7, each of which had an activity index of 9% and 107%. Meanwhile, at 40oC the best activity was shown by K10 pH 8 with an activity index of 59%. Based on Grams staining and microscopic analysis, isolates belong to Gram-positive coccus bacteria. Isolate K1A1 showed proteolytic and amylolytic activity, K1A2 showed high proteolytic activity but not amylolytic, while K10 did not show both activities.
Diversity and Distribution of Gastropoda and Bivalvia in Mangrove Ecosystem of Pelangan, Sekotong, West Lombok Dining Aidil Candri; M. Subandi Rahmani; Hilman Ahyadi; Yuliadi Zamroni
Jurnal Biologi Tropis Vol. 22 No. 3 (2022): July - September
Publisher : Biology Education Study Program, Faculty of Teacher Training and Education, University of Mataram, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jbt.v22i3.1413

Abstract

One group of invertebrates that live in the mangrove ecosystem is Mollusks of mainly Gastropods and Bivalves. They are associated with mangrove as life, shelter, spawning, and also as a place to get food to support the growth them. The purpose of this reaserch was to look at the effect of mangrove species and substrate type on the distribution Mollusks (Gastropods and Bivalves) in the mangrove ecosystem of Pelangan Village, district of Sekotong, west Lombok regency. This type of reaserch is descriptive explorative. Sampling was done by purposive sampling method with determine tree species, size, and substrate. Repeatation held six times each mangrove species. The results showed that there are 25 speciesd of mollusk in mangrove ecosystem, the most abundant species of gastropod in mangrove species is Clypeomorus moniliferus with a value of 6.9 ind / m2 contained in Osbornia octodonta. As for the distribution of each species of gastropods and bivalves are not affected by the mangrove species, but is influenced by environmental factors which in this case is a substrate.
The Growth Response and Yield of Cucumber (Cucumis sativus L.) Fertilizing in Various Doses Fitrianti Handayani; Maretik; Djunarlin Tojang; Mustafa R
Jurnal Biologi Tropis Vol. 23 No. 1 (2023): January - March
Publisher : Biology Education Study Program, Faculty of Teacher Training and Education, University of Mataram, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jbt.v23i1.4341

Abstract

Cucumber plant (Cucumis sativus L.) is a vegetable plant that has many ingredients which can be used as vegetables, fresh vegetables, salads, or pickles and also cucumber plants can be beneficial for health. Production of cucumber plants in Indonesia from year to year has always decreased. The cause of the low production of cucumber plants in Indonesia is due to several factors, namely environmental factors, cultivation methods and also due to pests and diseases. This study aims to determine and understand the effect of organic and inorganic fertilizers on the growth and production of cucumber plants. The research design used was a randomized block design (RBD) consisting of 5 treatments repeated 3 times, namely 6 kg of goat manure/polybag (P0), 3 kg of goat manure/polybag + 2.5 g of NPK fertilizer/polybag (P1 ), 4.5 kg goat manure/polybag + 1.25 g NPK/polybag (P2), 1.5 kg goat manure/polybag + 3.75 g NPK fertilizer/polybag (P3), 5 g NPK fertilizer/ polybag (P4). The results of the analysis of the variety of application of organic fertilizer at a dose of 6 kg gave optimal results on plant height and number of fruit on cucumber plants but not on the number of leaves, age at the start of flowering, and fruit weight on cucumber plants.

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