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Andrew Setiawan Rusdianto
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INDONESIA
Journal La Lifesci
Published by Newinera Publisher
ISSN : 27211304     EISSN : 27211207     DOI : https://doi.org/10.37899/journallalifesci
Core Subject : Science, Agriculture, Social,
Agriculture, Biological Sciences & Forestry Chemistry Earth & Planetary Sciences Environmental Science Immunology & microbiology
International Journal La Lifesci is peer reviewed, open access Academic and Research Journal which publishes Original Research Articles and Review Article editorial comments etc in all fields of life sciences including Agricultural, Fisheries, Earth, Environmental Science, Botany, Zoology, Microbiology, Ecology, Ethnobiology, Biodiversity And Conservation Biology, Genetics, Biochemistry , Bioinformatics, Biophysics, Biostatistics, Cytobiology Developmental Biology, Entomology, Immunology , Molecular Biology, Virology, agronomy, plant and animal breeding, agricultural economics and rural sociology, Veterinary science, Ornithology, Primatology, Biogeography, Histology, Marine biology, Biochemical Sciences Aquaculture, Fishery Hydrography, Fishery Engineering, Aquatic ecosystem, Fish farming, Fisheries management, Fishery Biology, Wild fisheries, Ocean fisheries, and all fields related to life sciences.
Arjuna Subject : Ilmu Pertanian dan Biologi (Semua) - Ilmu Pertanian dan Biologi (Lain-Lain)
Articles 174 Documents
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Study on the Impact of Water Quality from the Mebidang SPAM on Customer Satisfaction Surbakti, Paschalia Retnoningtyas; Anas, M. Ridwan; Hasibuan, Gina Cynthia Raphita; Mardianta, Anthoni Veery; Nursyamsi, Nursyamsi
Journal La Lifesci Vol. 6 No. 6 (2025): Journal La Lifesci
Publisher : Newinera Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37899/journallalifesci.v6i6.2775

Abstract

In 2021, the service coverage of PDAM Tirtanadi’s water supply system reached 73.3%. To further improve the service capacity, a new raw water source was developed through the construction of the Mebidang Regional Water Supply System (SPAM), which draws water from the Bingei River in Binjai City. The PDAM Tirtanadi branches directly affected by this change in raw water source include the Sei Agul and Diski branches. This study aims to evaluate customer satisfaction levels with the water product quality and service performance of the Mebidang SPAM at PDAM Tirtanadi. The methods employed include the Customer Satisfaction Index (CSI) and Importance and Performance Analysis (IPA). Data were collected through questionnaires distributed to both existing customers and new service connections at the Diski and Sei Agul branches of PDAM Tirtanadi. The results showed that customer satisfaction levels were as follows: long-term customers at the Diski branch scored 83.56%, new connections at Diski 83.57%, long-term customers at Sei Agul 82.78%, and new connections at Sei Agul 92.26%. These results indicate that both long-term and new customers at the Diski and Sei Agul branches are generally satisfied with the overall service quality. Based on the IPA results, the main priority for improvement at the Diski branch concerns the imbalance between the cost paid by customers and the volume of water received. Meanwhile, for the Sei Agul branch, variables categorized as low performance and low importance but still of lower priority include PDAM’s responsiveness to customer requests, such as for new connections or meter repairs.
Impact Analysis of Infrastructure Changes from Signalized Intersection to Underpass on Vehicle Exhaust Emissions Tarigan, Rallya Napinia; Anas, M. Ridwan; Mulia, Ahmad Perwira; Hasibuan, Gina Cynthia Raphita; Tarigan, Johannes
Journal La Lifesci Vol. 6 No. 6 (2025): Journal La Lifesci
Publisher : Newinera Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37899/journallalifesci.v6i6.2829

Abstract

The Medan City Government plans to make infrastructure changes by building underpass at the existing signalized intersection between Road Ir. H. Juanda and Road Brigjend. Katamso to reduce traffic congestion. In recent years, vehicle emissions have become a global concern due to their significant impact on public health and environmental quality. As road traffic and vehicle numbers continue to grow, transportation has become a key contributor to air pollution from vehicle exhaust emissions. Consequently, it is essential to assess whether the infrastructure changes from signalized intersection to underpass have an impact on vehicle exhaust emissions. The impact analysis of infrastructure changes on vehicle exhaust emissions is evaluated through traffic simulation using PTV Vissim software with two scenarios, namely the do nothing scenario (existing signalized intersection) and the do something scenario (underpass) ), focusing on CO, NOx, and VOC emissions. The comparative results indicate substantial changes: CO emissions declined by 42.5% (from 40,991 grams to 23,567 grams), VOC by 37.1% (from 9,500 grams to 5,975 grams), while NOx emissions increased by 23.3% (from 7,075 grams to 8,725 grams). These findings suggest that the infrastructure changes from signalized intersection to underpass can positively influence air quality by reducing specific pollutants. However, further studies are necessary to examine its broader impact on other types of vehicle exhaust emissions using diverse emission categories, multiple calculation approaches, and various analytical methods for comprehensive comparison.
The Relationship Between NH3 And NO2 Content and Bacterial Abundance Vibrio on Media Cultivation Shrimp Vaname (Litopenaeus vannamei) Hardianto, Toto; Perdana, Aulia Magfirah Ilham; Yunarty, Yunarty; Saridu, Siti Aisyah; Triadi, Feby
Journal La Lifesci Vol. 6 No. 6 (2025): Journal La Lifesci
Publisher : Newinera Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37899/journallalifesci.v6i6.2848

Abstract

Indonesia, as an archipelagic country, holds great potential in marine and fisheries resources. Whiteleg shrimp (Litopenaeus vannamei) is one of the most economically valuable aquaculture commodities, with production reaching 5,812.2 thousand tons in 2020, an increase of 52.8% compared to 2015. However, disease outbreaks remain a major challenge in shrimp farming. One common disease is vibriosis, caused by Vibrio sp., an opportunistic, highly virulent, Gram-negative and facultative anaerobic bacterium. Therefore, early detection of Vibrio abundance is essential for prevention and control efforts. This Final Internship Project (KPA), titled “Abundance of Vibrio Bacteria in Whiteleg Shrimp Culture Media,” aimed to determine the abundance of Vibrio sp. in shrimp ponds and analyze the influence of water quality parameters (NH₃, NO₂, and plankton). The internship was conducted from February 6 to April 17, 2025, at PT Parigi Aquakultura Prima, Central Sulawesi. Activities included water sampling, NH₃ and NO₂ testing, plankton density measurement, sterilization, TCBS media preparation, bacterial inoculation, and enumeration. Observations were carried out in six pond plots with weekly sampling from Day of Culture (DOC) 9 to 79. The regression model obtained was Y = 164.808 + 153.951X₁ + 2092.103X₂ + 0.000X₃, indicating that increasing NH₃ and NO₂ levels positively contribute to Vibrio abundance, each raising bacterial numbers by 153,951 and 2,092,103 units per one-unit increase, respectively. Plankton showed no significant effect. Thus, NH₃, NO₂, and plankton have partial influence on Vibrio abundance, although plankton contributes minimally.
Growth Response and Yield of Several Industrial Potato (Solanum tuberosum L.) Varieties in Highland and Medium-Altitude Environments Setiyono, Budi; Suliansyah, Irfan; Zainal, Aprizal
Journal La Lifesci Vol. 6 No. 6 (2025): Journal La Lifesci
Publisher : Newinera Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37899/journallalifesci.v6i6.2901

Abstract

The potato processing industry in Indonesia continues to face high market demand, while domestic production remains insufficient (reaching only 1.22 million tons in 2023), resulting in dependence on imported raw materials. The expansion of industrial potato cultivation in medium-altitude regions offers considerable potential due to land availability; however, it is constrained by high-temperature stress, requiring varieties that are both tolerant and high yielding. This study aimed to evaluate the growth response and yield performance of three industrial potato varieties Ventury Agrihorti (local), Atlantik (introduced), and Bliss/Chitra (introduced) under two contrasting altitude conditions: medium altitude (600 masl) and high altitude (1500 masl). The experiment employed a Split Plot Design, with observations covering growth parameters, yield components, and tuber quality indicators, including tuber specific gravity (SG). The results revealed a significant interaction between altitude and variety on several parameters, such as plant height, specific leaf weight, number of tubers, and tuber weight per plant. At medium altitude (600 masl), the Atlantik variety demonstrated the best performance, achieving a productivity of 40.39 t/ha with the highest tuber weight. However, Atlantik produced a high proportion of oversize tubers (41.97%), which does not meet industry grading standards. Conversely, at high altitude (1500 masl), Bliss/Chitra showed superior yield performance with a productivity of 42.96 t/ha, followed by Ventury at 38.46 t/ha. Ventury and Bliss/Chitra also excelled in tuber size distribution, producing the majority of tubers (approximately 94–95%) within the Normal category (Ø 4.5–9 cm), which aligns with industrial processing requirements in both altitude conditions. The specific gravity (SG) values of all three varieties ranged from 1.08 to 1.09, indicating compliance with the minimum quality threshold for potato processing industries (>1.08).

Page 18 of 18 | Total Record : 174

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