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BERKALA SAINSTEK
Published by Universitas Jember
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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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Bioethanol Production by Fermentation of Rice Husk and Golden Banana Peel Delignified Using EM4 Mulyani, Afnan Septi; Hidayah, Amaliyah Nurul; Paramita, Denok Risky Ayu; Azizah, Siti Nur
BERKALA SAINSTEK Vol 12 No 1 (2024)
Publisher : Universitas Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/bst.v12i1.43054

Abstract

The increasing number of vehicles can increase the need for fossil fuels and polution so that a safe alternative is needed. one of the environmentally friendly alternatives is bioethanol. Banana peels and rice husks contain carbohydrates that are good enough to be utilized as a microbial fermentation substrate to be converted into bioethanol. The purpose of this study is to determine the optimal level of bioethanol produced in rice husk and golden banana peel that has been delignified with EM4. The research method used is experimental research with research stages starting from the manufacture of rice husk powder and golden banana peel, delignification using EM4, measurement of lignin content, making rice husk slurry and golden banana peel delignification results, fermentation using baker's yeast with a concentration of 1%, measurement of bioethanol content, data collection and data processing using One Way Anova to determine differences in each sample. The results obtained bioethanol levels increased until the last day of fermentation, which is 9 days with levels of 46.08%. It can be concluded that the use of golden banana peel and rice husk that has been delignified with EM4 is able to produce the most optimal bioethanol.
The The Effect of Giving The Antioxidant Vitamin C in Tris-Egg Yolk Extender During The Preservation Period on The Quality of The Epididymal Spermatozoa of Mice (Mus musculus L.) Dewi, Efie Fadjrijah Eka; Mahriani, Mahriani
BERKALA SAINSTEK Vol 11 No 4 (2023)
Publisher : Universitas Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/bst.v11i4.39109

Abstract

Spermatozoa preservation is a method used to store spermatozoa in a diluent solution such as NaCl or tris-egg yolk. However, the longer storage of spermatozoa in the diluent solution can generally form ROS (Reactive Oxygen Species). The addition of antioxidants such as vitamin C to the diluent is expected to be able to bind ROS so that they are not toxic to spermatozoa and sperm quality can be maintained during the preservation period. The purpose of this study was to determine the effect of giving the antioxidant vitamin C in tris-egg yolk diluent during the preservation period on the quality of mice epididymal spermatozoa. Vitamin C used in this study was 0.5 mg, 1 mg, and 2 mg in 100 ml of tris-egg yolk diluent. Observation of spermatozoa quality was carried out within 0 to 48 hours with a span of 12 hours. The results showed that the addition of Vitamin C concentrations of 0.5 mg, 1 mg, and 2 mg in 100 ml of tris-egg yolk diluent was able to maintain the percentage of motility and vitality, but the longer the storage the quality of spermatozoa decreased. The concentration of vitamin C 0.5 mg, 1 mg, and 2 mg in 100 ml of tris-egg yolk diluent is a good concentration to maintain the quality of spermatozoa during 12 hours of storage, the rest will decrease. Further research is needed to increase the storage time of spermatozoa by using vitamin C and tris-egg yolk.
Metic: Biodegradable Plastic from Melinjo Starch and Waste Cooking Oil (WCO) as an Alternative Food Packaging Rahmawati, Tiara; Gunawan, Fikri Iqlilah; Azkia, Syifa Raisatul; Kinasih, Ida
BERKALA SAINSTEK Vol 12 No 3 (2024)
Publisher : Universitas Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/bst.v12i3.46829

Abstract

The use of plastic in food packaging and the high amount of plastic waste generated worldwide, including Indonesia, are serious threats to the environment. In addition, synthetic plastics in food packaging can also harm human health. Bioplastic products from natural ingredients and waste materials are developed as an alternative to reduce these risks. The purpose of this study was to determine the effect of the addition of starch concentration from melinjo seeds (Gnetum gnemon L.) with a combination of glycerol from waste cooking oil and chitosan substances from waste fish scales on the physical properties and biodegradability of bioplastics. To make bioplastic samples, the variation of melinjo seed starch concentration used in this study was 5, 10, and 15 grams with additional ingredients of 1 ml of glycerol and 1 gram of chitosan for each sample. Bioplastics were made at 32°C for 72 hours. Bioplastic properties were tested by conducting several tests such as swelling percentage, water and temperature resistance tests, tensile strength tests, elongation tests, and biodegradation tests. Based on this study, plastic with a composition of 5 grams of starch, 1 ml of glycerol, and 1 gram of chitosan produces the best physical characteristics of bioplastics and good reasonable biodegradation rates. Further research is recommended by increasing the concentration of starch, glycerol, and chitosan to produce better-quality bioplastics to be used as an alternative to commercial plastics.
Analysis of Nanobubbles (NBs) Technology and Foliar Fertilization on the Growth of Phalaenopsis sp. Orchid Puspa, Andria; Rahayu, Tintrim; Jayanti, Gatra Ervi
BERKALA SAINSTEK Vol 12 No 2 (2024)
Publisher : Universitas Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/bst.v12i2.39809

Abstract

Plants need nutrients which are then provided through fertilizers, but this can cause long-term problems due to limited absorption by plants so recently implemented NBs technology that can help reduce environmental pollution. This study aimed to determine the effect of NBsO2, NBsH2, NBsCO2, NBsN2 and, NBsO3 on the growth of Phalaenopsis sp. orchid plants. The research method was a complete randomized design (RAL) with 7 treatments (control without application of fertilizer and NBs, foliar fertilizer, NBsO2, NBsH2, NBsCO2, NBsN2, NBsO3) and 4 repeats. NBs were made using a nanogenerator with a flow of 5 liters/ minute and induced for 15 minutes. The data analysis used is the Multivariate Analysis of Variance (MANNOVA) test. The control and NBs treatments were given by dropping 5 ml on each orchid plant. The results showed that leaf length, number of leaves, plant weight and number of plant roots NBsN2 treatment had the best effect, while on root length, NBs O2 treatment had a better effect than other treatments. The application of foliar fertilizer is less effective to meet plant growth needs. At the same time, NBs are more effective because they are very small making it easier for plants to absorb.
Ants Density of Odontomachus sp. and Its Ecological Role in Kendari City Green Open Space Melvi Amalia, Hilda Ayu; Chairunnas, Armadi
BERKALA SAINSTEK Vol 11 No 4 (2023)
Publisher : Universitas Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/bst.v11i4.42681

Abstract

The degradation of environmental quality has become a global problem today. One way to address this is by providing green open spaces that help maintain environmental quality. Kendari city has a number of green open spaces (RTH) including, RTH in Baruga sub-district, Kendari mayor's office area and in Nanga-nanga botanical garden of Kendari city. This study aims to determine the density and ecological role of ants (Odontomachus sp.) in green open spaces in Kendari city. The method used in this study was hand sorting using ring samples with a diameter of 20 cm and a height of 15 cm in a plot measuring 25 m x 25 m consisting of 25 sampling points with a distance of 5 m per point. Data analysis was carried out by calculating the density at each research location, namely Baruga green space, mayor's park and Nanga-nanga botanical garden. The results showed that the highest density of ants (Odontomachus sp.) was found in the mayor's park with 16 ind/m2. The ecological role of ants (Odontomachus sp.) in Kendari city green open space is an important role in bioturbation and natural predators of soil fauna such as termites and earthworms.
Cover BST Volume 12 No 2 (2024) BERKALA SAINSTEK, Jurnal
BERKALA SAINSTEK Vol 12 No 2 (2024)
Publisher : Universitas Jember

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

Abstract

Effect of Duck Manure (Anas domesticus) and Compost on the Growth of Kangkong (Ipomoea reptans Poir var. Bangkok LP-1) on Aquaponic Systems Meliyani, Auliya Tri; Putra, Ramadhani Eka; Rahman, Heri
BERKALA SAINSTEK Vol 12 No 1 (2024)
Publisher : Universitas Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/bst.v12i1.34839

Abstract

Kangkung (Ipomoea reptans) menjadi salah satu sayuran yang paling banyak di konsumsi dengan tingkat konsumsi, pada tahun 2020, sebesar 3,784 kg/kapita/tahun. Akan tetapi, ketersediaan kangkung masih belum memenuhi kebutuhan masyarakat dengan data ketersediaan per kapita yaitu sebesar 1,03 kg/kapita/tahun. Oleh karena itu, perlu dilakukan peningkatan produksi kangkung terutama pada daerah urban, salah satunya melalui sistem akuaponik. Tujuan dari penelitian ini adalah untuk mendapatkan informasi mengenai komposisi dan dosis pupuk kandang bebek serta kompos terhadap pertumbuhan tanaman kangkung pada sistem akuaponik. Penelitian menggunakan rancangan eksperimental dengan faktor perbedaan yaitu pemberian pupuk kandang bebek dan kompos dengan komposisi yang berbeda. Terdapat lima perlakuan dengan masing-masing talang diulangi sebanyak 26 tanaman. Masing-masing perlakuan yaitu kontrol (0% pupuk/kompos), pupuk kandang bebek 750 g (50%), pupuk kandang bebek 1,500 g (100%), pupuk kompos 750 g (50%), pupuk kompos 1,500 g (100%). Hasil penelitian menunjukkan bahwa perlakuan pemberian pupuk kompos 100% (1,500 g) menghasilkan pertumbuhan dengan hasil paling optimal terhadap jumlah daun, panjang akar, biomassa basah, dan biomassa kering tanaman kangkung.
Synthesis of The Cu(II)-doped TiO2/Bi2O3 as a Photocatalyst for Rhodamin B Degradation Under Visible Light Ilumination Aritonang, Anthoni Batahan; Asma, Al; Sapar, Ajuk
BERKALA SAINSTEK Vol 11 No 4 (2023)
Publisher : Universitas Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/bst.v11i4.39799

Abstract

The Cu(II)-doped TiO2 and Cu(II)-doped TiO2 /Bi2O3 compound have been synthesized using the sol gel method with titanium tetraisopropoxide (TTIP) as the TiO2 precursor and Cu(NO3)2.3H2O as the Cu(II) dopant was carried out at various concentration of 0.075%; 0.250% and 1.000%, as well as Bi(NO3)3.5H2O as a Bi2O3 precursor. Based on characterization using the DRSUV-Vis spectrophotometric method with data analysis using a tauch plot, it is known that the band gap energy of Cu(II)-doped TiO2 is 2.89 eV; 2.72 eV; 2.54 eV. The addition of Bi2O3 to Cu(II)-doped TiO2 (1%) causes a decrease in the band gap from 2.54 to 2.18 eV which is equivalent to a wavelength of 567 nm. IR spectrophotometry spectra analysis shows a shift in Ti-O absorption towards smaller wave numbers. Characterization by the XRD method shows that 1% Cu(II)-doped TiO2 /Bi2O3 has an anatase phase with a crystallite size of 24 nm. Photocatalysis activity test on the degradation of rhodamine B solution at a concentration of 10 ppm, under visible light illumination for 180 minutes was able to degrade up to 85.85%.
The Implementation of Water Sensitive Urban Drainage to Overcome the Risk of Flooding in Malang City Yani, Dandy Achmad; Suwignyo, Suwignyo; Darmawan, Azhar Adi; Nissa, Khoirin
BERKALA SAINSTEK Vol 12 No 3 (2024)
Publisher : Universitas Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/bst.v12i3.47437

Abstract

This study aims to apply Water Resources Urban Design (WSUD) technology to improve water quantity and quality in the Brantas River Watershed (DAS), especially in Oro-Oro Dowo Village, Malang City. This village was chosen because several drainage channels have decreased efficiency in accommodating water runoff during the rainy season. The application of WSUD technology is expected to reduce the high surface runoff due to the decrease in water absorption areas, so this can be an alternative to conserving the availability of water resources in terms of quantity and quality. The modeling scenarios are arranged into two types. In the first scenario, the model is made without the application of WSUD, while in the second scenario, WSUD technologies are applied. There are permeable pavement, bioretention, constructed wetlands, and green roofs. The methodology used for the application of the WSUD concept is through the SWMM (Storm Water Management Model) program. The application of WSUD technology in the case study in Oro-Oro Dowo Village is planned along the sidewalks on Jalan Rinjani, Jalan Jakarta/Jalan Simpang Ijen, Jalan Besar Ijen, and Jalan Panggung, as well as green open spaces/city forests located in the administrative area of the village. The results of this study are in the form of a comparison of the total surface water runoff before and after the implementation of WSUD for each technology. As a result, green roof technology has the potential to reduce surface runoff higher than other technologies. However, the obstacles in the application of green roofs are the cost and roof leaks. Thus, the application of a combination of permeable pavement, bioretention, and constructed wetlands can be another option. The results of the application of the WSUD combination reached 96.88%.
Zodia (Evodia suaveolens) Leaves as Natural Mosquito Repellent Material: Effectiveness Test of Distillation Methods Sumalyani, Aisyah; Ma'mun, Sholeh; Riyanto, Riyanto
BERKALA SAINSTEK Vol. 12 No. 4 (2024)
Publisher : Universitas Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/bst.v12i4.53351

Abstract

Indonesia has around 40 types of plants with essential oil content from a total of around 150 types of essential oils traded in the international market. Essential oils are produced from various parts of aromatic plants such as fruits, seeds, leaves, flowers, roots, stems, bark, and even the entire tree. One of the plants that contains and has the potential to produce essential oils is the zodia (Evodia suaveolens), especially the leaves. Evodone is one of the active compounds contained in the essential oil of zodia leaves which has the ability as a mosquito repellent. This study aims to determine the effectiveness of hydrodistillation, steam-hydrodistillation, and steam distillation in terms of yield, physical properties, and active insecticide compound content. A total of 1000 g of fresh zodia leaves were put into a distillation kettle either boiled, steamed, or in direct contact with steam for three hours at 100 °C and atmospheric pressure. The remaining water content in the essential oil from the distillate was then absorbed with Na2SO4. Furthermore, the water-free essential oil was tested for its physical properties consisting of density, optical rotation, refractive index, and color tests, and then its chemical composition was analyzed using GC-MS. The results showed that the yield for hydrodistillation, steam-hydrodistillation, and steam distillation were 0.37%; 0.43%; and 0.31%, respectively. From the optical rotation test, the essential oil from steam distillation had the lowest value indicating the highest level of purity compared to the other two methods. This is in accordance with the density and refractive index data, where the essential oil from steam distillation had the highest value, where the color was darker. Meanwhile, based on the results of GC-MS analysis, the highest active insecticide compound in the form of evodone was obtained from steam-hydrodistillation (14.25%), followed by hydrodistillation (7.62%), and steam distillation (4.81%).

Page 24 of 26 | Total Record : 254

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