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ASEAN Journal on Science and Technology for Development

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Published by Universitas Gadjah Mada

ISSN : 22249028 EISSN : 22249028 DOI : -

Core Subject : Science, Education, Engineering,

Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Computer Science & IT Mathematics

The coverage is focused on, but not limited to, the main areas of activity of ASEAN COST, namely: Biotechnology, Non-Conventional Energy Research, Materials Science and Technology, Marine Sciences, Meteorology and Geophysics, Food Science and Technology, Microelectronics and Information Technology, Space Applications, and Science and Technology Policy, Infrastructure and Resources Development.

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Articles 477 Documents

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Ethanol Production in Yeasts Isolated from Fermented Kitchen Waste S Wong; S.K Wong; J.S Bujang
ASEAN Journal on Science and Technology for Development Vol. 29 No. 2 (2012): ASEAN Journal on Science and Technology for Development (AJSTD)
Publisher : Universitas Gadjah Mada

Microbial ethanol is a potential substitute for the non-renewable fossil fuel which is depleting. Yeasts have been long and extensively studied for ethanol production. The objectives of this study were to isolate yeasts from fermented kitchen waste and to determine their ethanol production performances. A number of fifteen yeasts were isolated from fermented kitchen waste. The yeastswere then grouped based on their ability to ferment different types of sugars. Three yeast isolates were selected for the analysis of ethanol production. Fermentation was carried out for 72 h in yeast extract peptone dextrose broth containing 18% glucose. Fourier transform infrared attenuated total reflection spectroscopy was used to monitor the ethanol production and glucose utilization. Isolate Y4 achieved the highest ethanol production at the level of 16%, while Y6 and Y8 demonstrated 12% and 11% ethanol yields, respectively. The isolates Y4, Y6 and Y8 were identified using universal fungal primers ITS1 and ITS4. The yeast isolates were closest to Saccharomyces cerevisiae (76%), Paracoccidioides brasiliensis (56%) and Saccharomyces boulardii (64%), respectively. This studyshowed that fermented kitchen waste could serve as a good source of yeasts for ethanol production.

Chemical Composition of Leaf and Seed Oils of Dryobalanops aromatica Gaertn. (Dipterocarpaceae) A.S Kamariyah; T Ozek; B Demirci; K.H.C. Baser
ASEAN Journal on Science and Technology for Development Vol. 29 No. 2 (2012): ASEAN Journal on Science and Technology for Development (AJSTD)
Publisher : Universitas Gadjah Mada

The essential oils of the leaves and seed of Dryobalanops aromatica Gaertn. obtained by hydrodistillation resulted in 0.07% and 1.89% yield, respectively. These oils were then examined by GC-MS. Eighty-three components (plus an unknown) were identified from the leaf oil, representing 92% of the oil. Oxygenated monocyclic monoterpenes (terpinen-4-ol 15%, ?-terpineol 16%), bicyclic monoterpene (?-pinene 7%) and oxygenated bicyclic sesquiterpene (globulol 8%) were the major constituents. In the case of the seed oil, 31 components were identified, representing 100% of the oil, while acyclic monoterpene (myrcene 5%), monocyclic monoterpene (limonene 6%), bicyclic monoterpenes (?-pinene 41%, ?-thujene and b-pinene 13% each, sabinene 6%), and bicyclic sesquiterpene (bicyclogermacrene 6%) made up the major components. The remaining constituents of each oil (54% and 10%, respectively) were found to be minor (?4% each). The chemical compositions of both oils differed quantitatively but showed important qualitative similarities and differences. The results of this study serve as the first report of complete chemical profiles of both oils.

Evaluation of Mixture Viscosity Models in the Prediction of Two-phase Flow Pressure Drops N.Z Aung; T Yuwono
ASEAN Journal on Science and Technology for Development Vol. 29 No. 2 (2012): ASEAN Journal on Science and Technology for Development (AJSTD)
Publisher : Universitas Gadjah Mada

Nine existing mixture viscosity models were tested for predicting a two-phase pressure drop for oil-water flow and refrigerant (R.134a) flow. The predicted data calculated by using these mixture viscosity models were compared with experimental data. Predicted data from using one group of mixture viscosity models had a good agreement with the experimental data for oil-water two-phase flow. Another group of viscosity models was preferable for gas-liquid flow, but these models gave underestimated values with an error of about 50%. A new and more reliable mixture viscosity model was proposed for use in the prediction of pressure drop in gas-liquid two-phase flow.

Utilization of Agricultural Wastes in the Manufacture of Composite Boards P.M Macatangay; E.C Mangundayao; C.A.M Rosales
ASEAN Journal on Science and Technology for Development Vol. 29 No. 2 (2012): ASEAN Journal on Science and Technology for Development (AJSTD)
Publisher : Universitas Gadjah Mada

Development of useful composite materials out of agricultural waste has become a desirable option in recycling. This led to the production of composite boards being used in the construction industry. In this paper, three types of available agricultural wastes in the province of Batangas — peanut shells, corn husks and banana sheath — were independently utilized in the production of composite boards. The raw materials were either air or sun dried, then crushed (for peanut shells) and extracted (for banana sheath and corn husks) before mixing with the binder. Urea formaldehyde (UF) was used as binder for peanut shells and banana sheaths while cleaned used plastic bags were chopped and mixed with corn husks before subjecting to hot compress machine. For each mat, the followingproportions were used:1000 gm banana fibres, 500 gm of UF mixed with 250 gm of water; 720 gm of crushed peanut shells, 133 gm UF with 12% resin content; 40% corn husks, 60% plastic strips by weight. The physical and mechanical characteristics like modulus of rupture (MOR), internal bond, face screw head test (FSHT) or Nail Head Pull through (NHPT), water absorption and thicknessswelling were determined for each board and the results were compared to the values set by the Philippine National Standards (PNS). Based on statistical results, the corn husk-plastic composite boards conformed to all parameters in the PNS; the density, thickness swelling, IBS, and NHPT/ FSHT of peanut shell-resin composite boards conformed to the PNS; and the thickness swelling,density, MOR and NHPT/FSHT of the banana sheath-UF composite boards conformed to the PNS.

Phase Manifestation and Formation of Nanoemulsions Composed of Imidazolium-based Ionic Liquid, Tween 80/Span 80 and Labrafac Lipophile WL 1349 S. H. Ng; P. M. WOI; C. C. ENG
ASEAN Journal on Science and Technology for Development Vol. 32 No. 2 (2015): ASEAN Journal on Science and Technology for Development (AJSTD)
Publisher : Universitas Gadjah Mada

onic liquids (ILs) can enhance topical and transdermal delivery, as well as increase the solubility of sparingly soluble drugs. In the present work, pseudo-ternary phase diagrams of emulsions were composed of a mixture of non-ionic surfactants, polyoxyethylene sorbitan monooleate (Tween 80®) and sorbitan monooleate (Span 80®) in weight fraction: 1:1, 1:2, 2:1 and 2:3, LabrafacTM Lipophile WL 1349 as an oil phase and 1-hexyl-3-methylimidazolium chloride [(HMIM) (Cl)] as a continuous phase. Emulsion formulations were selected with 10% surfactants from the pseudo-ternary phase diagrams and further prepared at 298.2 ± 0.1 K. Acoustic emulsificationmethod was used to prepare nanoemulsions that were mixed with freshly prepared hydrocolloid gum. The area of the single-phase zone in pseudo-ternary phase diagrams that varied with Tween 80® /Span 80® ratio in the order of 2:1 > 1:1 > 2:3 > 1:2 where Span 80® was replaced by an equivalent weight of Tween 80® to form IL-based nanoemulsions. [HMIM] [Cl] tended to create a two-phase system. Addition of carbopol® ultrez 20 copolymer into the continuous phase of the formulations gave single-phase nanoemulsions with good stability. The mixture of surfactants with weight ratio of 1:2 (Tween 80®/Span 80®) showed a good stability with the smallest particle size and greater surface charges in the system. These ionic liquid-based nanoemulsions might have the potential in drug delivery systems.

Utilization of Waste from Natural Rubber Glove Manufacturing Line V. DEVARAJ; F. I. NUR; A. I. H. DAYANG; H. K. NOR; M. N. ZAIROSSANI
ASEAN Journal on Science and Technology for Development Vol. 32 No. 2 (2015): ASEAN Journal on Science and Technology for Development (AJSTD)
Publisher : Universitas Gadjah Mada

Malaysia is the largest producer and exporter of examination and surgical gloves in the world and currently faced with mitigating large amounts of waste generated during the glove production process. This waste is mainly generated from glove dipping tanks and is referred as dipping tank coagulum (DTC). It is considered as scheduled waste which requires mandatory disposal by incineration, in compliance to the Scheduled Waste Regulations set by the Department of Environment. Work described in this study showed, DTC samples with a polymer content of >40%, both ash and calcium carbonate content of <10% and curatives <2% (Sulphur, antioxidants, accelerators and ZnO) when blended with virgin rubbers (SMR 10 and SMR 20) were found to be suitable for manufacturing value-added rubber products. DTC samples with polymer contents of <40% and lower in curativescould still be considered for recycling, by adding higher portions of virgin rubber for manufacturing products like shoe soles, carpet underlay and thermoplastic elastomer products. Glove manufactures should ideally set up on-site DTC processing facilities at their factory premises equipped with crepers as well as space to ‘air dry’ the creped DTC samples. Creped samples could be sent to the Malaysian Rubber Board (MRB) for chemical analyses. Factory owners could also present the analytical results from MRB to the recyclers to obtain a good premium for their processed DTC samples to be used as raw materials.

A Phenomenological Study on the Quality of Life Among Patients with Osteoarthritis Admitted for Rehabilitative Physiotherapy in a Private Hospital in Kuala Lumpur R. (III) P. DIOSO; R. TANGGAYA
ASEAN Journal on Science and Technology for Development Vol. 32 No. 2 (2015): ASEAN Journal on Science and Technology for Development (AJSTD)
Publisher : Universitas Gadjah Mada

The aim of this study is to explore patients’ experiences and how their rehabilitation and physiotherapy at a private hospital in Kuala Lumpur, Malaysia has affected their quality of life (QOL) due to osteoarthritis (OA). In addition, this study also aims to explore patients’ perspectives of the rehabilitation and physiotherapy for their OA before and after which affects moreover their QOL. The seven domains of the QOL were the physiological, social, financial,environmental, psychological, level of independence and spiritual – aimed to guide the theme of the interview sessions. A qualitative design was used. Of the 50 patients purposively enrolled only six were selected using inclusion and exclusion criteria. Thematic analysis addressed the seven domains of the QOL for data analysis. A 60-minutes interview session was audio-recorded. The rehabilitation therapy was explored on all seven domains of the QOL. Of the six respondents four explored their lived experiences on the social and environmental domain, while fiveon the physiologic domain. The spiritual, psychological, level of independence and financialdomains were mostly explored by the six respondents that have affected their QOL.

Decision Making Processes for a Pregnant Woman Admitted to the Accident and Emergency Department Requiring Emergency Diagnostic X-ray – A Case Study S. Ismanto
ASEAN Journal on Science and Technology for Development Vol. 32 No. 2 (2015): ASEAN Journal on Science and Technology for Development (AJSTD)
Publisher : Universitas Gadjah Mada

The objective of this study is to apply the decision-making processes for a pregnant woman who was involved in a motor vehicle accident and admitted to a private middle-class hospital in the capital of Indonesia requiring radiologic X-ray examination. It also aims to examine and evaluate the patient who was in her 20th week of gestation in order to provide her with the best emergency care, diagnostic investigations and treatments.The descriptive, normative and prescriptive models of decision-making are demonstrated. The descriptive model used intuition, while the normative model used decision trees as decision options and lastly the prescriptive decision used the information processing theory (IPT) to decide on the best emergency care, diagnostic investigations and treatments for the patient. The IPT dominated the decision-making process; hence an X-ray examination was done that was safe for the fetus and the childbearing mother. Decision option was not used since the patient was in pain and could not understand much of the procedure that was explained. Intuition helped in the decision-making in order to ensure safe and effective practice.

Decision Making Processes for a Patient with Cardiac Pacemaker Admitted to the Accident and Emergency Undergoing Magnetic Resonance Imaging – A Case Study F. P. Raditya
ASEAN Journal on Science and Technology for Development Vol. 32 No. 2 (2015): ASEAN Journal on Science and Technology for Development (AJSTD)
Publisher : Universitas Gadjah Mada

This case study aims to apply the processes of decision-making for magnetic resonance imaging (MRI) as a diagnostic examination for a patient with cardiac pacemaker admitted to a private hospital in the capital of Indonesia. It also aims to examine and evaluate the case of a 53-year-old mother who had a heart abnormality that has a pacemaker for one year and was diagnosed to do an MRI examination because of a suspected tumor on the wrist area.The three basic models of decision-making — the descriptive, prescriptive and normative — were applied. The prescriptive used the information processing theory, while the normative used decision trees as decision options and lastly, the descriptive used intuition and pattern recognition.Dominantly, the prescriptive model for decision-making is more appropriate for this case. The descriptive decision-making model, using intuition however, helped in supporting the intuitive hypothesis. Lastly, the normative model of decision-making played an important role but was not likely effective.

Nursing Care for a Patient with NSTEMI Admitted to the Coronary Care Unit for Percutaneous Coronary Intervention — A Case Study M. S. SITI MARYATI; R. (II) P. DIOSO
ASEAN Journal on Science and Technology for Development Vol. 34 No. 1 (2017): ASEAN Journal on Science and Technology for Development (AJSTD)
Publisher : Universitas Gadjah Mada

This case studyaims to demonstrateclinical nursing skills to a patient with myocardial infarction admitted for percutaneous coronary intervention. Nursing care for this patient startedwith a physical assessment and laboratory invesigation analysis. This evaluation was necessary to develop a nursing care plan. The activities in the ward enumerated the medications provided, and the details of the vital signs monitored hourly. The patient was sent to cardiac catheter laboratory at 1030H. From the cardiac catheter laboratory post-percutaneouscoronary intervention to the mid-right coronary artery (1 Drug-Eluting Stent) he was transferred out to Telemetry unit on 11 August2016 at 1500H with Terumo band hemostatic device through radial approach

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