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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 7 Documents
 1 
Search results for , issue "Vol 9 No 2 (2021)" : 7 Documents clear
Designing A 3-Dimensional Campus Brochure Application Based On Augmented Reality Dayat, Abd. Rachman; Angriani, Liza
BERKALA SAINSTEK Vol 9 No 2 (2021)
Publisher : Universitas Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/bst.v9i2.21958

Abstract

STMIK Umel Mandiri as one of the universities in Jayapura is still less well known, apart from being relatively new in its age and the location of the campus building which is blocked by buildings. So that people sometimes do not know the exact location of the campus. To promote the campus, one of the advertising media used is brochures. Along with current technological developments, augmented reality technology has emerged which is able to combine 2 (two) realities, namely the real and virtual world. When used in brochures, it can provide a feel and experience for readers. So that promoting goods or services can be done more interactively, as well as providing more information to consumers about the product. This augmented reality technology is then used as a solution to the problems faced by STMIK Umel Mandiri in promoting its educational institutions. The purpose of this research is to produce an android application that can display a 3 (three) dimensional brochure model by utilizing augmented reality technology so that it can help the public to get to know the campus to be chosen well. The research method has several stages, namely collecting data about the needs of prospective new students regarding information about the STMIK Umel Mandiri campus, then making a 3 (three) dimensional model of the STMIK Umel Mandiri Campus Building. Then next, do the design of compatible augmented reality on smartphone devices using the Android operating system, and produce 3 (three) dimensional augmented reality objects. This research produces an application based on augmented reality technology that is used to help promote the STMIK Umel Mandiri Campus through devices with the android operating system.
Abundance and potency of Non-Symbiotic Nitrogen-Fixing Bacteria in Padang Sapu-sapu, Pejem Village, Bangka Hermiati, Hermiati; Nurtjahya, Eddy; Mansur, Irdika
BERKALA SAINSTEK Vol 9 No 2 (2021)
Publisher : Universitas Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/bst.v9i2.20057

Abstract

Padang sapu-sapu soil is similar with post-tin mining soil in its white sand texture and poor nutrient. One factor causes the disturbed land in Bangka Belitung islands is tin mining activity. One method to rehabilitate marginal soil is by utilizing the potential nonsymbiotic N2-fixing bacteria, which are able to fertilize the soil and is able to provide macro nutrient. This study aims to measure the abundance and potency of non-symbiotic N2-fixing bacteria in padang sapu-sapu, Pejem Village, Bangka. The site selection is determined by purposive sampling method and interviews and the samples were collected randomly. Isolation used selective media Ashby'`s Monitol Agar and Azospirillum media. Morphological characterization was conducted on isolates and a series selective test was carried out, i.e. hipersentivity test, hemolysis test, IAA phytohormone test and nitrogenase test. The study of the abundance population of non-symbiotic N2-fixing bacteria of two different locations showed that the total bacterial population in padang sapusapu is very small compared to its lowland forest. Isolate Azotobacter sp. TH105(a) from the lowland forests is potential as natural fertilizer.
Synthesis and Characterization of Bacterial Cellulose-Polyaniline Composite with Variation of Dopant Concentration Ummami, Riza; Busroni, Busroni; Piluharto, Bambang
BERKALA SAINSTEK Vol 9 No 2 (2021)
Publisher : Universitas Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/bst.v9i2.18120

Abstract

Polyaniline is a type of conductive polymer. Bacterial cellulose has high mechanical properties, so it can be made into polyaniline base composite materials. A stable form of polyaniline oxidation at room temperature is emeraldine base. The emeraldine base has a conductivity value of 10-6 S/cm. Dopants can change the shape of emeraldine base to emeraldine salt by protonation process. Emeraldine salt is a conductive form of polyaniline. The conductivity value of emeraldine salt is 0,03-0,07 S/cm. The addition of dopan in synthesis of polymer was carried out to determine its effect on the conductivity value. The disadvantage of polyaniline is that its mechanical properties are weak and easily brittle. Modifications are needed to improve the mechanical properties of polyaniline, one of which is the manufacture of composite. Bacterial celluloce has high mechanical properties so it can be made into polyaniline base composite materials. Synthesis of bacterial cellulose-polyaniline composites by in situ chemical polymerization methods. Syntehsis is started with BC membrane was dipped into aniline solution for about 2h with stirring at room temperature. The BC was immersed into ammonium peroxydisulfate solution for about 30m with stirring. The bacterial cellulose-polyaniline compositions obtained are black color which is characteristic of the emeraldine salt. The highest conductivity value of composite was obtained from the addition of 3,5M HCl dopant which was 4,70x10-4 S/cm. FTIR analysis of composite obtained peak of the characteristic polyanilin was conductive at 1565,92 cm-1 as C=C quinoid ring and 1442,95 cm-1 as C=C benzoid ring.
Antibacterial Activity of Liverworts of Dumortiera hirsute (Sw.) Nees Ethyl Acetate Extract Against Pathogenic Bacteria Luthfiah, Luthfiah; Setyati, Dwi; Arimurti, Sattya
BERKALA SAINSTEK Vol 9 No 2 (2021)
Publisher : Universitas Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/bst.v9i2.22645

Abstract

Dumortiera hirsuta is one of the liverworts that can be used as a medicinal to prevent infection by pathogenic bacteria. The content of secondary metabolites of D. hirsuta has potential as antibacterial properties includes flavonoids, alkaloids and steroids. This research is to analyze the antibacterial activity of moss D. hirsuta against pathogenic bacteria that will be beneficial to humans. Liverworts of D. hirsuta were extracted using ethyl acetate solvent and tested against three types of pathogenic bacteria using the agar well-diffusion method. The results of this study indicated that the ethyl acetate extract of D. hirsuta at 100% concentration could inhibit the growth of Escherichia coli, Staphylococcus aureus, and Salmonella typhi bacteria. The range of antibacterial activity categories of the ethyl acetate extract of D. hirsuta to E. coli, S. aureus, and S. typhi between weak to moderate.
Effect of Baluran Gum Arabic on Blood Glucose Level in Diabetic Rat (Rattus Novergicus ) Wiyono, Hidayat Teguh; Utami, Eva Tyas; Wardhani, Dinna Wahyu Putri
BERKALA SAINSTEK Vol 9 No 2 (2021)
Publisher : Universitas Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/bst.v9i2.22533

Abstract

Diabetes mellitus is a metabolic disease which indicated with increasing blood glucose level. Carbohidrate, protein, mineral and secondary metabolite (alkaloid, tannin and saponin) can be benefical to treat diabetes mellitus. Rats were randomly divided into three groups. First, control group. Second, STZ group, untreated diabetic. Third, STZ+GA 15% group, diabetic treated with GA 15%. Result showed that blood glucose level before STZ induction on control and STZ group within normal range 78,57±11,90 mg/dL and 74,85±6,86 mg/dL. Blood glucose level significantly increase after STZ induction on STZ and STZ+GA 15% group become 375±6,53 mg/dL and 346,42±50,23 mg/dL. Diabetic rat treated with GA 15% revealed decrease in blood glucose level compared to untreated diabetic rat. Blood glucose level on STZ+GA 15% group continuously decrease become 96,42±13,45 mg/dL and 82,14±9,19 mg/dL. In conclusion, GA 15% could reduce blood glucose level on diabetic rat.
Purification of Xylooligosaccharide From Casavva Pulp by Ultrafiltration Method Ratnadewi, Anak Agung Istri; Fauziyah, Kamelia Rizqi; Indarti, Dwi
BERKALA SAINSTEK Vol 9 No 2 (2021)
Publisher : Universitas Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/bst.v9i2.23388

Abstract

Xylan is the main component of hemicellulose. Xylan can be extracted from agricultural waste, such as cassava pulp. Xylan is used as an endo-β-1,4-D-xylanase substrate to produce impure xylooligosaccharides (XOS)This study aims to purify XOS from cassava pulp using the ultrafiltration method. The components of XOS obtained from the enzymatic hydrolysis were analyzed using thin layer chromatography (TLC) and densitometry methods. In addition, the XOS was purified by the ultrafiltration method using a cellulose membrane with a Molecular Weight Cut Off (MWCO) of 12 kDa. The permeate obtained from the purification results was also analyzed using TLC and densitometry. The results of this study indicated that the components in XOS cassava pulp before and after purification by the TLC method were X5 and X6, while the XOS components before and after purification by the densitometric method were X3, X4 and X5.
Growth of Lactobacillus casei FNCC0900 in Media Based Umbi Porang Plant (Amorphophallus muelleri BI.) Azhari, Fitri; Winarsa, Rudju; Siswanto, Siswanto; Muzakhar, Kahar; Utarti, Esti; Sutoyo, Sutoyo; Arimurti, Sattya
BERKALA SAINSTEK Vol 9 No 2 (2021)
Publisher : Universitas Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/bst.v9i2.19034

Abstract

Porang tuber (Amorphophallus muellerii BI.) Is a type of tuber that has a high enough glucomannan content of 67%. Glucomannan is very difficult to digest by humans directly so it takes the role of probiotics. L. casei bacteria FNCC0900 as a probiotic agent capable of utilizing glucomannan as a carbon source for growth. The purpose of this study was to determine the growth pattern and changes in environmental factors, namely the pH value of the probiotic bacteria L. casei FNCC0900 growth medium. The parameters in this study consisted of the highest cell density, generation time and pH value changes in Glucose Yeast Peptone Liquid Media, Porang Boiled Water Media and Porang Flour Liquid Media using the drop plate method which had 4 repeated calculations. Porang Boiled Water Liquid Media has a faster log phase period with a higher cell density than Porang Flour Liquid Media, but the shortest generation time is found in Porang Flour Liquid Media with the highest number of generations. L. casei FNCC0900 bacteria are more able to reduce the pH of Glucose Yeast Peptone Liquid Media compared to porang tuber-based media, so in this case L. casei FNCC0900 can be stated to be able to grow on porang tuber-based media with growth patterns, generation time, cell density and pH value. which varies.

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