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Widyariset

widyariset
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Published by Lembaga Ilmu Pengetahuan Indonesia

ISSN : 14117932 EISSN : 24610976 DOI : -

Core Subject : Engineering,

Engineering

Widyariset is a scientific journal which publishes the results of research and development, assessment and systematic thinking about science and technology. The writers of the scientific papers in this journal come from researchers/researcher candidates from various institutions' research and development (R&D), and universities. Widyariset is published regularly three times a year: in April for the issue of Social Sciences and Humanities (IPSK), in August for the issue of Natural Sciences (IPA) and in December for the issue of Engineering Sciences (IPT).

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Articles 18 Documents

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Search results for , issue "Vol 16, No 3 (2013): Widyariset" : 18 Documents clear

PHYTOPLANKTON ABUNDANCE VARIATION AT FLOATING NET CAGE AREA, JATILUHUR RESERVOIR, WEST JAVA Masayu Rahmia Anwar Putri; Sri Endah Purnamaningtyas
Widyariset Vol 16, No 3 (2013): Widyariset
Publisher : Pusbindiklat - LIPI

Eutrophic waters are one triggering factor for the explosion of harmful phytoplankton populations. The aim of this study is to determine the abundance of phytoplankton in floating net cage area Jatiluhur Reservoir. Research carried out in January and March of 2009 and 2010. Water sample taken vertically by water depth, and taken temporally based on the observation time. The composition of phytoplankton and it is abundance in 2010 in Jatiluhur Reservoir less than 2009. 48–49 genus of phytoplankton found on 2009 and on 2010, just 20–25 species found. Based on its composition Chlorophyceae class more than others and based on its abundance, the Cyanophyceae class more dominated. The composition and the abundance of phytoplankton have a different pattern in every observation time and also changed by its depth. The highest of Cyanophyceae class indicated that Jatiluhur reservoir was eutrophic waters.

THE ABNORMALITY MORPHOLOGY OF Namalycastis (POLYCHAETA: NEREIDIDAE) FROM JAKARTA BAY AND ESTUARY WAY BELAU LAMPUNG Sevi Sawestri
Widyariset Vol 16, No 3 (2013): Widyariset
Publisher : Pusbindiklat - LIPI

Namalycastis (Polychaetes: Nereididae) lives in estuarine that can be used as polluted bioindicators. Morphological abnormalities in some Polychaeta members have been found previously, whereas the abnormality Namalycastis from Indonesia has never been recorded. The aim of this research was to study the abnormality morphology of Namalycastis form Jakarta Bay (polluted sediment) and estuary Way Belau-Lampung (unpolluted sediment). There were two species of Namalycastis in both locations, i.e. N. abiuma and N. cf borealis. The abnormality of Namalycastis collection from both locations consist of five structures i.e. on antenna appendages, eyes, tentacular cirri, parapodia, and setae. The abnormality of Namalycastis collection from Jakarta Bay was higher than from Way Belau. The abnormality of parapodia and setae in this research might had resulted from the influence of polluted habitat conditions.

ADAPTATION STUDY OF SOME NEW SUPERIOR VARIETIES OF RICE IN DISTRICT OF SERAM BAGIAN TIMUR Wahid Wahid; Maryam Nurdin
Widyariset Vol 16, No 3 (2013): Widyariset
Publisher : Pusbindiklat - LIPI

This study was aimed to obtain at least 2–3 varieties which produce high quality and good adaptation in Maluku. The study was conducted in rice fields the village of Jakarta Baru, the Regency Seram Bagian Timur in 2011. The experiment was laid out in a Randomized Block Design with three replications and five treatments. Legowo model 4:1 with plant spacing of (20 cm x 10 cm) x 40 cm was used as a cropping system. The measured parameters consisted of plant height, number of productive tillers per hill, panicle length, number of grains per panicle, total grain weight (g)/hill, and the dry grain yields/hectare (ton/ha). Results showed that among five tested varieties, Inpari 13 has the highest production followed by Conde variety suggesting that both Inpari 13 and Conde varieties are promisingly varieties to be developed in the district of Seram Bagian Timur.

IDENTIFICATION OF SEDIMENT PROPERTIES DEGRADATION OF DELTA CIMANUK DEPOSIT BASED ON STRATA BOX DATA Riza Rahardiawan
Widyariset Vol 16, No 3 (2013): Widyariset
Publisher : Pusbindiklat - LIPI

Knowledge on physical properties of seafloor sediments is essential in planning offshore construction, in particular oil and gas construction. Changes in the physical properties of sediments such as faults and fractures, as well as the presence of gas within seafloor sediments can be detected as a decrease in acoustic wave velocity due to reduction in sediment shear strength. Normalization of Cimanuk River in early 1980s has resulted in higher sediment influx and increasing rate of compaction that change the physical properties of the sediment. Analysis of amplitude and wave velocity using software SonarWiz 5 on the records obtained from sounding equipment: Sub-Bottom Profiler type ODEC Strata Box and Bathy 1500, show significant change in wave speed that is caused by shallow gas seepage associated with fractures in the Polygonal Fault System (PFS ). This fault system formed as a result of diagenetic processes of fine grain sediment and reduction of the sediment shear strength due to accumulated sediment cover. Shallow gas seepage itself is commonly found in organic-rich marine sediments and are usually composed of methane.

IN VITRO SHOOT PROLIFERATION OF STRAWBERRY USING STEM PLANTLET EXPLANT DERIVED FROM MERISTEM CULTURE Ahmad Syahrian Siregar
Widyariset Vol 16, No 3 (2013): Widyariset
Publisher : Pusbindiklat - LIPI

The fruit of strawberry contain phenolic compounds of vitamin C, B1, and B2 which is beneficial for health The successful of strawberry micropropagation depending on the ability of explants to produce large number of plantlets in short time. In order to increase the number of plantlets by organogenesis the use of plantlet stems as explants need to be optimized. The aim of this research was to investigate the potential of stem plantlet explants on the shoot proliferation of strawberry using 8 medium treatments. Research was conducted in the Plant Breeding Laboratory at Citrus Research Centre and Subtropical Fruit Indonesia, started from February to September 2011. The results showed that explant from stem of plantlet from meristem culture of strawberry could be used as initial material to proliferate strawberry plantlet. High number of plantlet (5.73) was produced on MS medium containing combination of plant growth regulator BAP and NAA at concentration of 0.5 mg/l and 0.025 mg/, respectively.

ACETIC ACID FORMATION STUDY IN COCOA SWEATINGS TREATMENT UNDER ANAEROBIC CONDITION Mahensa Billqys Nurhayati Prativi
Widyariset Vol 16, No 3 (2013): Widyariset
Publisher : Pusbindiklat - LIPI

This research aimed to study the possibility of cacao sweatings treatment to produce intermediate compound i.e. acetic acid in acidogenesis processes. It were carried on an anaerobic Circulating Bed Reactor which is made from flexyglass 6 L capacities and operated in batch system. The operation of two circulating bed reactor conducted at room temperature for 20 days and nitrogen gas flushing is performed at one of the reactor for 10 minutes in the beginning of operation. Gas composition analysis indicates the persistence of O2 in reactor A, hence the acetic acid formation follows the aerobic pathway and occurs more rapidly. Concentration of O2 in reactor B is relatively low compared to reactor A. So that is concluded that acetic acid formation reach the anaerobic pathway and run slowly. This research indicates that the presence of O2 in the reactor affect the pathway of acetic acid formation.

THE EFFECT OF ORGANIC MATTER AND PLANTING TIME IN INTERCROPPING SYSTEM OF PEANUT AND MAIZE Sarjoni Sarjoni
Widyariset Vol 16, No 3 (2013): Widyariset
Publisher : Pusbindiklat - LIPI

Intercropping system is a double cropping, involving the growing of two or more crops sequentially or delaying of growing period of a crop. Effect of intercrop competition on the utilization of solar radiation, water, mineral nutrients, and space to grow can cause yield losses. This study was aimed to evaluate the effect of organic matter and planting time in intercropping system of peanut and maize on growth and yield. The research was carried out at the Experimental Farm of Haluoleo University in 2008 and was laid out in a Split Plot Design with three replications. The treatment consisted of two factors, organic matter as main plot and planting time as subplot. Results showed that interaction between organic matter and planting time had significant effect on seed number of maize, pod number of peanut , weight of 100 seeds of peanut, and yield and harvest index of maize and peanut.

COMMUNITY OF PHYTOPLANKTON AT KARIMUNJAWA NATIONAL PARK, JEPARA, CENTRAL JAVA Arip Rahman; Mujiyanto Mujiyanto
Widyariset Vol 16, No 3 (2013): Widyariset
Publisher : Pusbindiklat - LIPI

Karimunjawa National Park is one of nature conservation area in Jepara Regency. The development of the tourism sector in the region will affect the condition of waters. The research aimed to determine community of phytoplankton in the waters Karimunjawa. The study was conducted in April, July, October, and November 2012 with field survey. Phytoplankton samples were taken using plankton net from four locations which purposively chosen. Water quality parameters were recorded including temperature, salinity, dissolved oxygen, and nutrient. The result indicated that there were 34 species of phytoplankton which grouped into two classes, Bacillariophyceae and Diniphyceae. Diversity index ranging 0.89 and 2.3, equitability index ranging 0.67 and 0.99 and dominance index ranging 0.09 and 0.46. Based on criteria of biological indices and analysis of water quality, the condition of the waters in National Parks Karimunjawa is stable moderate. During the research does not happen certain phytoplankton species dominance.

FACILE PHOTOMETRIC DETERMINATION OF SILVER WITH 2,4,5,7-TETRAIODOFLUORESCEIN STABILIZED WITH STARCH Erik Prasetyo
Widyariset Vol 16, No 3 (2013): Widyariset
Publisher : Pusbindiklat - LIPI

Simple photometric determination of silver was developped. The determination incorporated 2,4,5,7-tetraiodofluorescein (erythrosine) as chromogenic reagent to form positive colloid with silver ion, not ion associate as initially assume. The colloid was then stabilized with starch and this ternary system erythrosine-silver-starch was applied as basis in determination of trace amount of silver (0–6 µg/ml). The developped method was successfully applied to determine silver in three synthetic samples and came with accuracy > 96.87% after compared to atomic absorption spectrophotometry (AAS) results and reproducibility < 8.8%.

SIZE FRACTIONATION OF ZOOPLANKTON BIOMASS AND SPECIES COMPOSITION IN THE LAGOON OF PULAU PARI, SERIBU ISLANDS Reny Puspasari
Widyariset Vol 16, No 3 (2013): Widyariset
Publisher : Pusbindiklat - LIPI

Zooplankton is the main prey of fish larvae. The match between fish larvae and its prey depends on the size and the composition of zooplankton. The study aims to investigate the biomass and species composition of zooplankton and their relationship to the environmental conditions in Pulau Pari Lagoon. Research was conducted from June to November 2010. Results showed that 63,9% of zooplankton biomass consisted of microzooplankton, dominated by the class of Crustacea with subclass of Copepoda, and 36,1% of zooplankton biomass consisted of mesozooplankton, dominated by the class of Crustaceasu with subclass of Malacostraca. The biomass peak occurred at the end of July indicating the highest food availability and this could support fish larve survival.

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Contact Name
-

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widyariset@mail.lipi.go.id

Editorial Address
Pusbindiklat Peneliti-LIPI (The National Training and Education Center for Researchers Development – Indonesian Institutes of Sciences) Jl. Raya Bogor Km. 46, Cibinong Science Center Cibinong - Bogor 16911

Location
Kota adm. jakarta selatan,

Dki jakarta

INDONESIA