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INDONESIA
HAYATI Journal of Biosciences
Published by Institut Pertanian Bogor
ISSN : 19783019     EISSN : 20864094     DOI : -
Core Subject : Science, Agriculture,
Agriculture, Biological Sciences & Forestry Earth & Planetary Sciences
HAYATI Journal of Biosciences (HAYATI J Biosci) publishes articles and short communication in tropical bioscience fields such as development, biotechnology, biodiversity and environmental issues. HAYATI J Biosci covers wide range of all life forms topics including virus, microbes, fungi, plants, animal and human. HAYATI J Biosci has been also indexed/registered in Crossref, DOAJ, CABI, EBSCO, Agricola and ProQuest.
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Articles 5 Documents
 1 
Search results for , issue "Vol. 25 No. 3 (2018): July 2018" : 5 Documents clear
Analysis of The Javan Green Peafowl (Pavo muticus muticus Linnaeus 1758) Habitat in Baluran and Alas Purwo National Park, East Java Jarwadi Budi Hernowo; Cecep Kusmana; Hadi Sukadi Alikodra; Ani Mardiastuti
HAYATI Journal of Biosciences Vol. 25 No. 3 (2018): July 2018
Publisher : Bogor Agricultural University, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (950.741 KB) | DOI: 10.4308/hjb.25.3.101

Abstract

Information of javan green peafowl habitat is commontly informate as general and only discribing typical habitat used. Details information and data of the componen habitat, availability and function such as (food resources, shelter, cover, drinking site, nesting site, etc), and characteristic function of habitat componen at every habitat type are very important to be known how habitat component support to the javan green peafowl live Baluran and Alas Purwo national park is one of distribution javan green peafowl and it was choosen to study on the habitat analysis. The research was aimed to is to analysis and synthesis of availability, fucntion and characteristic habitat of javan green peafowl and to descripbe of ideal habitat for javan green peafowl. Vegetation analysis was used as method approach to obtain composition, structure of vegetation and potential food, shelter, cover and nesting site. Base on activities of the bird and combaining with use of habitat component, analysis of habitat used was done. The result showed that javan green peafowl get food at open area and feed much on grasses and shrubs.Drinking site is areal where water available contiously. The characteristic of feeding site is open area which is growth by grasses and shrubs. The shelter sites were used by the birds such as trees or ground bellow trees where are closed to feeding site. Characteristic roosting site is tall trees (emergent trees), the leaves are not dense, rather open, the branches of the trees form a relatively upright angle to the stem, and not far from the trees present the open area. The green peafowl select nest places at open area which is grow by shrubs and put the eggs at the ground. The ideally habitat of the javan green peafowl composed by open area which is growing by grasses and shrubs as feeding site, places where water resources available as drinking site, tree or shaded places as sheltering and resting site, tree, forest or dense shrubs for covering/refuge site, dust places for dusting activities, open area for dancing and open area which is growing by shrubs for nested places were compound closed each other.
Optimization of Cellulase Production by Aspergillus niger ITBCC L74 with Bagasse as Substrate using Response Surface Methodology Abdullah Abdullah; Hamid Hamid; Marcelinus Christwardana; H. Hadiyanto
HAYATI Journal of Biosciences Vol. 25 No. 3 (2018): July 2018
Publisher : Bogor Agricultural University, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (742.776 KB) | DOI: 10.4308/hjb.25.3.115

Abstract

Cellulase is a very important enzyme for lignocelluloses based ethanol production. Bagasse contains mainly cellulose (57.76%), hemicellulose (12.44%), lignin (21.34%), and others (7.96%). Lignocellulosic material has been considered as the good option for cellulase production because it is cheap and already available in a huge amount. The objective of this research was to produce cellulase enzyme and to optimize it by using response surface methodology. The bagasse with water content of 80% was incubated with 2 ml inoculum of Aspergillus niger ITBCC L74 in a 250 ml Erlenmeyer flask. After reaching the specified time the enzyme was extracted and then determined for its activity. Effect of process parameters such as pH, urea and MgCl2 addition were studied. The optimal cellulase activity was achieved at urea concentration of 4.5% (w/w), MgCl2 concentration of 1 mM and pH of 3.5, with maximum enzyme activity was 0.630 U/gr.
Satellite Imagery for Classification of Rice Growth Phase Using Freeman Decomposition in Indramayu, West Java, Indonesia Rian Nurtyawan; Asep Saepuloh; Agung Budi Harto; Ketut Wikantika; Akihiko Kondoh
HAYATI Journal of Biosciences Vol. 25 No. 3 (2018): July 2018
Publisher : Bogor Agricultural University, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (2686.101 KB) | DOI: 10.4308/hjb.25.3.126

Abstract

  Monitoring at every growth of rice plants is an important information for determining the grain pro-duction estimation of rice. Monitoring must to be have timely work on the rice plant development. However, timely monitoring and the high accuracy of information is a challenge in remote sensing based on rice agriculture monitoring and observation. With increased quality of synthetic aperture radar (SAR) systems utilizing polarimetric information recently, the development and applications of polarimetric SAR (PolSAR) are one of the current major topics in radar remote sensing. The ad-vantages provided by PolSAR data for agricultural monitoring have been extensively studied for applications such as crop type classification and mapping, crop phenology monitoring, productivity assessment based on the sensitivity of polarimetric parameters to indicators of crop conditions. Freeman and Durden successfully decomposed fully PolSAR data into three components: Single bounce, double bounce, and volume scattering. The three-component scattering provide features for distinguishing between different surface cover types. These sensitivities assist in the identification of growing phase. The observed growing phase development in time series, reflected in the consistent temporal trends in scattering, was generally in agreement with crop phenological development stages. Supervised classification was performed on repeat-pass Radarsat-2 images, with an overall classification accuracy of 77.27% achieved using time series Fine beam data. The study demonstrated that Radarsat-2 Fine mode data provide useful information for crop monitoring and classification of rice plants.
Ontogenetic Allometry of Body Height and Body Mass of Girl in Baduy, Indonesia Eneng Nunuz Rohmatullayaly; Alex Hartana; Yuzuru Hamada; Bambang Suryobroto
HAYATI Journal of Biosciences Vol. 25 No. 3 (2018): July 2018
Publisher : Bogor Agricultural University, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (390.178 KB) | DOI: 10.4308/hjb.25.3.138

Abstract

Several small-scale populations exhibited phenotypic plasticity whereby growth spurt of body height occurred much earlier than age at menarche and this was not followed by same early spurt of body weight. This leads to question whether growth trajectory of stature follow the same growth trajectory of body mass and whether the trajectory itself is associated to sexual maturity. We evaluated developmental plasticity observed in Baduy girl, a traditional population in Indonesia, in facing strenuous environmental and biocultural conditions. We measured stature and body mass cross-sectionally. We determined age at menarche as population average of age of girls that had already got their first menstruation. Growths of body fat and weight followed a same mode and timing and their spurts pivoted on the age at menarche. In contrast, growth spurt of body height occurred four years earlier than menarche and velocity curve of body linearity progressed in opposite direction to that of body ponderality. The prevailing poor nutrition and high physical activity elicited principle of ontogenetic allometry to synchronize the acceleration and deceleration of growths in body linearity and ponderality whereby growth in body height functions to reach the body size target and to provide skeletal framework for development of body mass. The biocultural conditions lead to slow bodily growth rate with low spurt resulting in the characteristics of Baduy girl that was small in size and late in both sexual maturity and full-grown ages.
An Inventory of Chiropteran Fauna in Bhubaneswar City, Eastern India Subrat Debata; Sharat Kumar Palita
HAYATI Journal of Biosciences Vol. 25 No. 3 (2018): July 2018
Publisher : Bogor Agricultural University, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (2045.969 KB) | DOI: 10.4308/hjb.25.3.144

Abstract

An inventory of chiropteran fauna was carried out in Bhubaneswar city, Odisha, eastern India during October 2015 and March 2016 following roost survey and mist net survey techniques. During the study a total 19 species of bats belonging to seven families including the nationally threatened Rhinolophus rouxii were recorded of which family Vespertilionidae was the most diverse one, represented by five species. Majority of 11 species are found roosting and breeding in old temples and caves and are vulnerable from renovation activities, persecution and tourism. Therefore, long term monitoring of these sites are essential to understand the population trend over time and derive appropriate conservation implications.

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