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Widyariset
Published by Pusbindiklat Peneliti LIPI
ISSN : -     EISSN : 24610976     DOI : 10.14203
Core Subject : Science, Engineering,
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Widyariset is a scientific journal which publishes the results of research and development, assessment, and systematic thinking about Natural Science.
Arjuna Subject : Umum - Umum
Articles 17 Documents
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Search results for , issue "Vol 16, No 2 (2013): Widyariset" : 17 Documents clear
UTILIZATION OF BIOFLOCS FROM NURSERY FOR FRESHWATER PRAWN (Macrobrachium rosenbergii) LARVAE REARING Asep Sopian; Ikhsan Khasani; Fajar A
Widyariset Vol 16, No 2 (2013): Widyariset
Publisher : Pusbindiklat - LIPI

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (104.664 KB) | DOI: 10.14203/widyariset.16.2.2013.227-237

Abstract

The Bioflocs technology development in the aquaculture industry is very prospective due to many inheren benefits, especially for water quality control and nutrition substitution. This study aims to determine the effect of media bioflocs nursery for freshwater prawn (Macrobrachium rosenbergii) larvae rearing. The experiment design with completely randomized design was used in the study with 3 treatments and 6 replications. The treatment used were: A. without bioflocs addition (control), B. the addition of 5 ml bioflocs, and C. the addition of 10 ml bioflocs. The 1st day old larvae was used in the study and reared on a 60 l conical fiberglass at 50 ind/l of density. The main parameters were larvae development or larval stage index (LSI) and survival rate (SR). Based on the result of statistical analysis showed that the addition of bioflocs affected survival rate significantly (p<0.05) and the best survival values generated by the addition biofloc treatment as much as 5 ml.
THE DESIGN AND TESTING OF ADSORPTION REFRIGERATION SYSTEM WITH TWO ADSORBERS Andi Taufan; Nasruddin Nasruddin
Widyariset Vol 16, No 2 (2013): Widyariset
Publisher : Pusbindiklat - LIPI

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (323.233 KB) | DOI: 10.14203/widyariset.16.2.2013.269-276

Abstract

This paper discusses design and testing of adsorption refrigeration system with two adsorbers. Main components consisted of two adsorber with 6.6 kg solidified activated carbon inside, expansion valve, evaporator, condenser, and reservoir. All of that were connected with stainless steel pipes. The test performed for 75 minutes using 250 ml of methanol pro-analysis of 99.9% as a refrigerant in the system and the water temperature is 250C which is pumped through copper pipes to cool the adsorbents. The air pressure in the system during the test were in vacuum. The average pressure difference between the adsorber and the evaporator during testing was 4.6 cmHg. The lowest temperature was 140C obtained after the 65th minute.
EFFECTIVENESS OF COMPOST EXTRACT INDUCING SYSTEMIC RESISTANCE IN CIGAR TOBACCO PLANT AGAINST Cucumber Mosaic Virus (CMV) Abdullah Umar; Wiwiek Sri Wahyuni
Widyariset Vol 16, No 2 (2013): Widyariset
Publisher : Pusbindiklat - LIPI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/widyariset.16.2.2013.309-318

Abstract

Tobacco is a highly valuable commodity and Cucumber mmosaic vvirus (CMV) is an economically important disease. This study was aimed to determine the effectiveness of compost extract inducing systemic resistance in cigar tobacco against CMV. The experiment was arranged in a randomized block design (RBD) with two factors (5/K x2/V). K factor consisted of five types of three kinds of compost extract, Pseudomonas putida and control, while factor V consisted of 2 types of with or without virus inoculation. Each treatment was repeated 5 times. Its effectiveness was assessed by observing severity of the disease at 24, 27, 31, 36, 40, and 44 days after virus inoculation. The result showed that application of compost extract or P. putida Pf-20 on 15 days before inoculation of CMV could induce the systemic resistance of cigar tobacco and extended to the period of incubation up to 22 days. Rice straw compost extract was more effective than leaf litter compost extract or coffee husks. However, the indication effectiveness of those three extract were lower than P. putida. 
EFFICACY OF MYCORRHIZAE AND Trichoderma AS A BIOLOGICAL CONTROL OF BASAL STEM ROT DISEASE (Ganoderma) AND AS A PROMOTOR OF OIL PALM SEEDLING GROWTH Donnarina Simanjuntak; Fahridayanti Fahridayanti; Agus Susanto
Widyariset Vol 16, No 2 (2013): Widyariset
Publisher : Pusbindiklat - LIPI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/widyariset.16.2.2013.233-242

Abstract

The experiment was in randomized block design which consisted of 14 treatments with 7 treatment combinations with Ganoderma infection and 7 treatment combinations without Ganoderma infections, there were 75 replications for each treatment combinations. The treatment combinations included applications of Mycorrhizae, Trichoderma, and standard fertilizer. Variables observed were disease incidence of Ganoderma, plant height, number of frond, and weight mass. The results showed that the application of Mycorrhizae was able to control basal stem rot disease until 7 months after the application of Ganoderma. A single application of Mycorrhizae had not been able to promote seedlings growth until 10 months. The role of Mycorrhizae in promoting seedling growth until 10 months was demonstrated when combined with Trichoderma and standard fertilizer application.
CARBONDIOXIDE SINK ABILITY OF 15 PLANT SPECIES COLLECTION IN BOGOR BOTANICAL GARDEN Masfiro Lailati Lailati
Widyariset Vol 16, No 2 (2013): Widyariset
Publisher : Pusbindiklat - LIPI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/widyariset.16.2.2013.277-286

Abstract

The increasing number of industries and motor vehicles has an impact in the increased concentration of carbondioxide in the atmospheree. This has been causing green house effects (global warming). Therefore, the availability is essential for absorbing carbondioxide in large capacity, both in forest areas as well as in large cities. The objective of this research is to measure carbondioxide sink ability of fifteen (15) species of local plants and to determine the effective in absorbing carbondioxide. Leaf of local plants collection samples were collected from the Bogor Botanical Garden. Carbohydrate analysis was done in the Laboratory Biokimia BB-BIOGEN Bogor, while stomata examination was done in Laboratory Kayu Solid IPB. The data obtained were analyized using carbohydrate mole comparation and linear regression. The highest sink ability was found for canary (12,638.453 g/hour) and the lowest was found for sandalwood (1.379 g/hour). Sink ability of the other species ranged between 131.244 g/hour and 11,461.506 g/hour.
THE POTENTIAL OF Paenibacillus spp. AS PLANT GROWTH PROMOTER IN TROPICAL PEAT ECOSYSTEM Andri Frediansyah; I Made Sudiana
Widyariset Vol 16, No 2 (2013): Widyariset
Publisher : Pusbindiklat - LIPI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/widyariset.16.2.2013.201-210

Abstract

Microbial activity in soil play key important role for maintaining ecosystem health. The objective of this research was to explore the potential of bacteria isolated from Kalampangan, Central Kalimantan tropical peat soil as biofertilizer agent. We found 4 isolates have ability to produce amylase and cellulose and have nirK gene as denitrify ability. Base on the 16S rDNA analyses and morphological observation, those bacteria were identified as Paenibacillus durum, Paenibacillus polymyxa, Paenibacillus macerans, and Paenibacillus azotofixans. P. polymyxa also can produce plant growth hormone (indole acetic acid), P. azotofixans contains ow gene indicating that the strain is able to solubilize calcium as well as alluminium phosphate. All strain excepted P. durum was also contains NifH gene indicating that this strain is able to fix N2. With these characteristics the fourth isolates of bacteria can be used as agents of biological fertilizers for peatland.
RESISTIVITY ANOMALY AT MOUNT KABA, BENGKULU, INDONESIA, AS INFERRED FROM GEOELECTRICAL INVESTIGATION Titi Anggono; Syuhada Syuhada; Bogie Soedjatmiko
Widyariset Vol 16, No 2 (2013): Widyariset
Publisher : Pusbindiklat - LIPI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/widyariset.16.2.2013.319-326

Abstract

Mount Kaba is a volcano located in the magmatic arc Bukit Barisan near the town of Curup, Rejang Lebong, Bengkulu, Indonesia. Two geothermal manifestations have been found in this region in form of hot springs at Suban Airpanas (50oC) and Sindangjati (37oC). Geoelectrical survey based on Schlumberger array up to AB/2 2,000 m was carried out in 2009–2011 in the surrounding area of Mt. Kaba. The aim of the investigation was to locate the distribution of low resistivity anomaly layer that may associate with hydrothermally altered subsurface rock in the area. It is estimated that the depth of low resistivity (< 5 ohm-m) found in the eastern part of Mt. Kaba is about 400 m.

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