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BERKALA SAINSTEK
Published by Universitas Jember
ISSN : -     EISSN : -     DOI : -
Core Subject : Science, Education, Agriculture,
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemistry Mathematics Physics
Berkala SAINSTEK (BST) merupakan jurnal ilmiah yang memuat artikel hasil penelitian di bidang sains dan teknologi. Secara khusus BST diperuntukan bagi penulis internal mahasiswa Universitas Jember bidang fisika, matematika, biologi, kimia, teknik sipil, teknik mesin, teknik elektro dan sistem informasi. Namun BST juga menerima artikel dari penulis eksternal sepanjang memenuhi kriteria dan dalam lingkup bidang sains dan teknologi.
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Articles 254 Documents
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The Utilization from Glucomannan of Porang Flour (Amorphophallus Muelleri Blume) as a Raw Material for Making an Edible Film Nurlatifah, Ismi; Amyranti, Mutia
BERKALA SAINSTEK Vol 11 No 3 (2023)
Publisher : Universitas Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/bst.v11i3.38122

Abstract

Porang (Amorphophallus Muelleri Blume) is a type of tuber that contains various nutrients, especially glucomannan. Besides as being a source of food, the high content of glucomannan can also be used as an alternative for making edible films, because it contains mannan polymers which have the ability to form fine and crystallized fibers. The purpose of this research is to determine the potential of glucomannan in porang tuber flour as a basis for making edible films. Glucomannan used with various variations (3, 6 and 9 grams). The first stages used were testing porang tuber flour and then made edible film base by carrying out various chemical analyzes based on the Japanesse Industrial Standard method. The results showed that the acquisition of water, ash and protein sequentially was 11.782%, 1.821%, 6.275% which conform to the SNI 7939;2013 standards. The 3 gram variation and 0.087 mm thickness of Glucomann showed the best water resistance value of 20.34%. The biodegradability test showed that the 6 grams variation of glucomannan had the best degradation ability, that is 100% for 12 days.
Ocean Contribution to Coastal Heavy Rainfall During Dry Season (Case Study of Bengkulu 2016-2022) Firdaus, Muhamad Dadan; Syamsuddin, Mega Laksmini; Yulihastin, Erma
BERKALA SAINSTEK Vol 12 No 2 (2024)
Publisher : Universitas Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/bst.v12i2.43989

Abstract

This study aims to determine the contribution of the ocean to the intensity of heavy rainfall in Bengkulu, Indonesia during the dry season (2016-2022). The primary data used in this study is daily rainfall data from the Bengkulu Meteorology Climatology and Geophysics Agency BMKG station. In addition, supporting data are also used in the form of rain parameters, 10 m wind, sea surface temperature, and sea surface currents from ERA5 reanalysis data with daily temporal and spatial resolution of 0.05°. The method used is a composite method that calculates 64 samples of heavy rain. The results showed that low-speed winds formed an eddy in the sea area west of Sumatra which together with heavy rains resulted in an increase in sea surface temperature. In addition, for the 2019 dry season case study, 1 m/s winds near the Bengkulu coast are associated with heavy rainfall (>100 mm) and during the 2022 dry season, 1-4 m/s winds spread from the coast to the Indian Ocean sea, causing rainfall (>50 mm) on the Bengkulu coast and surrounding areas. When sea surface temperatures are high there is the potential for heavy rainfall in areas of low wind speed. The current in each year is different and has a pattern, every year a strong current from the Indian Ocean will move towards the coastal area every 3-year period. When in 2016 the current (>1 m/sec) is in the Indian Ocean, then the following year 2017 the current (>1 m/sec) shifts closer to the coastal area until in 2018 a strong current is on the coast and the following years a stronger current comes from the Indian Ocean.
The Diversity of Amphibian (Order Anura) in Bandealit Resort, Meru Betiri National Park Siddiq, Arif Mohammad; Pradana, Yuan Zulia; Setiawan, Rendy; Sulistiyowati, Hari
BERKALA SAINSTEK Vol 12 No 1 (2024)
Publisher : Universitas Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/bst.v12i1.42624

Abstract

Meru Betiri National Park (MBNP) is a conservation area located in East Java that has a diversity of flora and fauna. However, the information about entirety diversity in this area is still uncleared, due to limited scientific research, one of which is amphibians. So, the aim of this study is to explore the diversity of amphibian species (order Anura) in Bandealit Resort, MBNP. Data collection was carried out on January 6-8, 2023 in four representative habitat types i.e., terrestrial, arboreal, semi-aquatic, and aquatic. The data collection method was using Visual Encounter Surveys (VES) on each observation line with a length of 300m. The ecological data collected included the species names of amphibians (Anura) and the number of individuals of each species. Furthermore, data analysis was using species composition and species diversity using the Shannon-Wiener index (H'). Based on the results, six species of Anura were found (Fejervarya cancrivora, F. limnocharis, Leptobrachium hasseltii, Kaloula baleata, Hylarana chalconota, and Polypedates leucomystax) belonging to five families (Dicroglossidae, Megophryidae, Microhylidae, Ranidae and Rhacophoridae). Species P. leucomystax was found with the highest number of individuals (eight individuals) and occupied arboreal, terrestrial, and semi-aquatic habitat types. Based on the Shannon-Wiener index, the species diversity value of the order Anura amphibians was obtained in the moderate category (H'=1.47). This shows that the Bandealit Resort in MBNP provides an important habitat for several species of the order Anura amphibians. Furthermore, the results of this study also provide updated data regarding the existence of amphibian species of the order Anura in MBNP, especially Bandealit Resort.
Acute Toxicity Test of Jalembi Probiotic Beverages on Mice ddY Anindita, Reza; Sari, Afrinia Eka
BERKALA SAINSTEK Vol 11 No 4 (2023)
Publisher : Universitas Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/bst.v11i4.34514

Abstract

An acute toxicity test is one of the pre-clinical tests needed to determine the safety of the consumption of a product before clinical trials are carried out on humans. The purpose of this study was to confirm whether or not there was a toxic effect of jalembi juice probiotic drink (red guava, lemon, melon, beetroot) on male and female mice observed for 14 days. This research design is experimental. The samples in this study were jalembi probiotic juice drinks with Lactobacillus plantarum starter and 40 male and female ddY mice. This research procedure was carried out by giving jalembi juice as a test preparation with doses of 124, 640, 3200, and 16000 mg/kg BW as much as 0.59 ml in males and females mice. Data analysis was carried out with One-Way ANOVA. This study showed that the administration of probiotic drink jalembi juice with doses of 124, 640, 3200, and 16000 mg/KgBW as much as 0.59 ml did not cause death, changes in body weight, and clinical symptoms in all test animals. It can be concluded that the probiotic drink jalembi juice is categorized as practically non-toxic (> 15 g/KgBW) or passes pre-clinical testing as a safe drink for consumption.
Virtual Screening of Inhibitor Compounds for HL-60 Cell Line Using QSAR and Molecular Docking Approaches Putri Handayani, Maulina Surindri; Sudarko, Sudarko; Nugraha, Ari Satia
BERKALA SAINSTEK Vol 12 No 1 (2024)
Publisher : Universitas Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/bst.v12i1.42341

Abstract

Leukaemia is a type of heterogeneous malignancy disease in which the number of immature white blood cells in the bone marrow is increased or poorly differentiated. Inhibitors of HL-60 cell line are important drugs in the treatment of leukaemia. This study aims to identify potential inhibitors for HL-60 leukaemia cells using virtual screening with QSAR and molecular docking approaches. The best QSAR model obtained was the model with R2 testing value of 0.72. The best model was applied to the Enamine database, obtained 3,841,278 compounds with pIC50 above 9 were clustered to end up with 50 inhibitor candidate compounds. The compounds were further studied through molecular docking against CDK- 2 and BCL-2 target proteins with binding free energy analysis. Screened compounds have high inhibitory potential against CDK-2 and BCL-2 target proteins in HL-60 cells which can be proposed as potential inhibitors of HL-60 cells. These compounds can be further tested for the development of more effective antileukaemia drugs.
Cover BST Volume 11 No 4 (2023) BERKALA SAINSTEK, Jurnal
BERKALA SAINSTEK Vol 11 No 4 (2023)
Publisher : Universitas Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Cox Proportional Hazard Model for Analysis of Farmers Insurance Premium Payment Period Rosida, Ayu; Fatekurohman, Mohamat; Dewi, Yuliani Setia; Arif, M. Ziaul
BERKALA SAINSTEK Vol 12 No 3 (2024)
Publisher : Universitas Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/bst.v12i3.47118

Abstract

The sub-sector of agriculture plays a significant role in the national economic order. The crop failure rate is one of the unexpected risks caused by natural disasters, including drought, pest attacks, and floods. Agricultural insurance has been used as a pilot project in several areas, such as Gresik and Palembang Regencies. This pilot project has not been carried out in many places and cannot be implemented optimally in Jember. Farmer insurance is a transfer of risk due to farming business losses so that the sustainability of the farming business can be guaranteed. Survival analysis is a statistical method for analyzing data with observed response variables in terms of the time until an event occurs. One survival analysis is to determine the factors that cause an event with a response variable, namely using the Cox Proportional Hazard Model. The results of the significance testing obtained the variable that had a significant influence on the model, namely the growing season variable (X4). Then, a hazard ratio comparison was made for the category of cultivation season variables, and the category with the lowest hazard value was selected, followed by the second category, the months of May until August. (X42), This significantly influenced the policyholder’s time spent paying farmer’s insurance premiums.
Invitro Activity of Mineral Trioxide Aggregate Modification from Rice Hull Ash Silica and Calcium Oxide from Clamshells Yuliatun, Leny
BERKALA SAINSTEK Vol 12 No 2 (2024)
Publisher : Universitas Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/bst.v12i2.45789

Abstract

The impact of SrO particles and hydroxyapatite (HA) on the characteristics of Mineral Trioxide Aggregate (MTA) from silica Rice Husk Ash (RHA) and Precipitated Calcium Carbonate (PCC) from clam shell has been studied in this research. Silica and calcium oxide are used as material to form tricalcium silicate (C3S) and dicalcium silicate (C2S) in MTA. Bi2O3 and SrO were added in MTA with 18% (w/w) total percentage. MTA was made with a sol-gel process and used catalyst NH3. After synthesis, material was calcined at 1000 oC for 3 h. HA was added at percentages of 3, 6, and 9% in 5% SrO modified MTA to see the effect of its addition on the material. The modified MTA (MTA-SrO-HA) were hydrated water using water to powder method with ratio of 3:1. The MTA-SrO5/HA6 showed higher compressive strength and dentine interaction to the commercial MTA (Proroot brand) in days 3 and 7. This material had potential as a root canal filling in dental endodontic treatment.
Snack Production Planning Strategy using Goal Programming Method Umama, Nadya; Pradjaningsih, Agustina; Riski, Abduh
BERKALA SAINSTEK Vol 12 No 1 (2024)
Publisher : Universitas Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/bst.v12i1.45345

Abstract

UD Surya Snack Banyuwangi is one of the Banyuwangi snack shops that produces several kinds of snacks such as dry sponge cake, Bagiak, sato, sale, and others. Production at the factory is closely related to meeting market demand. Therefore, factories must carry out production planning so that they can produce products in sufficient quantities to meet market demand. Production planning involves making decisions regarding the number of products produced, resource allocation, and setting up the production process to achieve effectiveness and efficiency in the process. The article based on this research aims to obtain optimization values in production planning to meet market demand using the Goal Programming method. Goal Programming is a method that aims to minimize deviations from all goals by adjusting decision variables to achieve conformity with the specified goals. This research was carried out by direct observation at UD Surya Snack which was in direct contact with the factory owner. The data and information used in this research include production volume, production value, profits, production costs, and labor costs in one month. The data was then modeled using the Goal Programming method to determine decision variables, constraint functions, and objective functions and solved with the help of Excel Solver. The results obtained show that the application of Goal Programming in UD. Surya Snack production planning shows optimal values. The total profit earned was IDR 17.078.000 in one month after deducting production costs and labor costs. The deviation values of all constraints that must be minimized in the objective function have been met.
Quantitative Characteristics of Crossing Bali Cows with Different Strain of Bulls in Waelata District Buru Regency Umaternate, Shahrun M.; Rajab, Rajab; Papilaya, Bercomien J.
BERKALA SAINSTEK Vol 11 No 4 (2023)
Publisher : Universitas Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/bst.v11i4.38985

Abstract

This study aims to determine the quantitative characteristics of the crossbreed Bali cattle with several male breeds such as the Ongole, Limousine, and Simmental breeds. The method used in this research is the observation method in the form of direct observation in the field and measurement of cattle. A total of 30 adult cattle aged 1.5-2 years, consisting of 10 heads each (5 males and 5 females) crosses through Artificial Insemination (AI) of Bali cattle using frozen semen of Ongole breed bulls (POBAL), Limousin (LIMBAL) and Simmental (SIMBAL). The results showed that POBAL cattle had an average body length of 114.4-116.0 cm, chest circumference 179.4-220.0 cm, shoulder height 126.2-143.8 cm, and body weight 407.15-586.84 kg . LIMBAL cattle have an average body length ranging from 129.4-151.2 cm, chest circumference 170.4-191.8 cm, shoulder height 123.0-151.6 cm, and body weight 370.184-457.122 kg. While the average body length for SIMBAL cattle ranges from 159.8-180.0 cm, chest circumference 166.6-219.8 cm, shoulder height 125.8-154.1 cm, and body weight 356.662-584.678 kg.

Page 22 of 26 | Total Record : 254

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