Majalah Ilmiah Biologi BIOSFERA: A Scientific Journal
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Isyarat Sentuhan Antena Semut (Dolichoderus Sp) Pada Tubuh Aphid (Aphis Sp) Untuk Memperoleh Embun Madu
Get PDFAnt, Dolichoderus sp, interact mutually with aphid (Aphis sp). The ants specifically communicate with the aphid by means of antennal sign. A hungry ant will approach an aphid and touch it dorsal part using ant antennae; in respond to this, will expel honey dew. To further study the pattern of communication between the ant and the aphid, their movement was recorded using Handycam JVC GR-SXM 300 AC. The records were processed using Adobe Premier Pro 1.5. The results showed that the ant antennae moved in a specific pattern which could be classified into 4 main steps. The first step consisted of 8 movements which formed 2 movement patterns. The second step consisted of 3 main repeated movements. The third step consisted of 3 main repeated movements. The fourth step consisted of 6 main movements which were repeated several times before the final movement. Such pattern of antennae movement was recognized by the aphid as tactile signal of ant identity
Syzygium (Myrtaceae) di sepanjang Sungai Welang Taman Wisata Alam Gunung Baung Purwodadi
No full textSyzygium is one of a genus within family Myrtaceae which consists of many potentially useful species. This genus is quite distributed covering most of Indonesian geographical area. This research was aimed to evaluate species richness of Syzygium grows naturally along River Welang, Taman Wisata Alam Mount Baung, and its habitat. This was done by an explorative method along River Welang. Data recorded included geographical position, diameter and height of Syzygium and its morphological characters. A total of 23 individuals were obserbed belonging to four Syzygium species, i.e., S.semarangense, S. javanicum, S. pycnanthum, dan Syzygium sp
Peningkatan Kualitas Akuakultur Menggunakan Teknologi Biofilter Mikroalga Imobil
Get PDFImmobilized microalgae Chlorella pyrenoidosa was applied initially to nutrient and heavy metal removal of wastewater. Immobilized microalgae using alginate was then developed for aquaculture application, such as controlling fish water culture quality to uptake concentration of ammonium, nitrate and to increase oxygen level in water. During immobilization, algal cells maintained their respiratory and photosynthetic activities as that in the normal condition. The objective of this research was to examine the role of immobilized C. pyrenoidosa on controlling water quality by measuring ammonium, nitrate, and dissolved oxygen contents. Five aquariums consisting of 40 litres of water were filled with 20 Nila tilapia (Oreochromis niloticus) with the average weight of 1.6 to 1.7 g. The immobilized algae cells were packaged in two nillon porous bags (pore size of 2x3 mm in diameter) and each immobilized cell had 4 millimeter in diameter. Each aquarium was added with 3000, 4000, 5000, and 6000 immobilized cells. The treatment had two replications. The results showed that the aquarium filled with 4000 beads of immobilized cells gave the best yield
Status Kerentanan Aedes aegypti (Diptera: Culicidae) pada Tahun 2006-2007 terhadap Malation di Bandung, Jakarta, Surabaya, Palembang dan Palu
Get PDFStudies on the susceptibility of Aedes aegypti collected in 2006-2007 from five cities in Indonesia, i.e. Jakarta, Bandung, Surabaya, Palembang and Palu were tested by using the WHO standard test to determine their susceptibility status to Malathion. The results showed that despite the fact that Malathion has been used for >32 years, in general Ae. aegypti from all study sites, except from Palembang, were still susceptible to Malathion. This paper offers some possible factors that might have involved in delaying the onset of resistance to Malathion
The Effects of Nitrogen Fertilizer Dosages on Anatomical Characters of Ipomoea batatas L. Leaf
No full textThe research was conducted in order to understand the effects of various nitrogen dosages on the anatomical characters of Ipomoea batatas leaf, and to find out the most influential dosage on the number and size of leaf anatomical characters. The characters observed consisted of thickness of cuticle, leaf, and palisade, as well as stoma size, and their density within mm2 of leaf surface. The method applied was experiments arranged in Completely Randomized Design. The results showed that all levels of nitrogen dosage affected the anatomical characters of sweet potato leaf while the most influential dosage was 200 kg urea per ha
Identifikasi dan Karakterisasi Isolat 23 Ducc Serta Kemampuannya dalam Memproduksi Enzim Inulinase
Get PDFInulinase has a capacity to convert inulin into fructose hence it could be used in high fructose syrup production. Inulinase is not readily available in Indonesian market. This enzyme could be obtained from thermotolerant yeast found in Dahlia variabilis. Therefore this study was conducted to identify inulinolytic yeast in D. variabilis. The results showed that an inulinolytic yeast isolate 23 DUCC from D. variabilis tubers was found. The inulinolitic yeast produces inulinase (E.C.3.2.1.7). Based on the identification and determination, the isolate is known to be Kluyveromyces marxianus. The best optimation condition for this yeast was as follows: concentration of carbon source (inulin) was 0.75%, pH was 5.5 and time of fermentation was 53 hours. In such condition K. marxianus produced inulinase up to 0.6481 IU
Pemanfaatan Limbah Padat (fly ash) untuk Mencegah Cemaran Mikrobiologis dan Kimiawi Sampah Kota pada Ekosistem Rawa
Get PDFThe research on the utilization of solid waste (fly ash) has been conducted to avoid the further effect of microbial and of the municipality solid waste in the wetland ecosystem. The purpose of this research is to utilize the fly ash, the solid waste of the PLTU industry, as protective layer (geosynthetic liners/GCLs) at waste disposal areas in order to avoid microbial and chemical pollution to the environment. During the research, ponds with 6x6x4 m in size was added with GCLs (layer of 30 sacs of fly ash 25 kg/sac at each 2 meters of pile waste) and a control pond. The result shows that fly ash with the composition of SiO2 (42,92 %) and AlO2 (29,45%) can be utilized as a protective layer (geosynthetic liners), because after 3 weeks it can minimize the contamination of bacteria (total decrease of coliform bacteria > 50%) to the environment, and also reduce some toxic compound, especially heavy metal such as Pb (30,1%) and Cu (43,54%), and the content of nitrate (32,1%). Hence fly ash has economic and ecological values as a protection layer at the solid waste disposal area to avoid the environmental contamination of bacteria’s and chemicals
Bioekologi Udang Macrobrachium spp. di Sungai Banjaran Kabupaten Banyumas
No full textShrimp species diversity in River Banjaran is in a trend to reduce from time to time. In order to verify this trend, a research on bioecology of freshwater shrimp Macrobrachium spp. In River Banjaran was done using survey method. River’s body was divided into three different areas according to their environmental condition. On each area, six sampling stations were defined with the distance among stations were ± 0.5 km. The shrimps were collected using electroshocker, ancho, and waring. The samples were preserved in 70% ethanol and were identified. Only four species of shrimps were found during the survey, those are Macrobrachium cowlesi, M. idea, M. esculentum, and M. oenone. Shrimp relative abundance among areas was similar with the highest relative abundance was found for M. cowlesi. Sex ratio analysis for all species showed that male individuals were more abundance than the female ones. This result provided a picture that species diversity of freshwater shrimps in River Banjaran is still in continuous decrease. Therefore, it is necessary to make some efforts to conserve the rest of Machrobrachium species in Banjaran River
Floristics Composition of Tomong Forest at Sambas, West Kalimantan
Get PDFTomong forest at Sambas regency is a restricted tropical forest along Sambas riverbank area. The forest have been threatened and decreased due to development of oil palm plantation and human settlement. The plant plant diversity and natural ecosystem in this area should be conserved soon. Sambas botanical garden establishment, which is a serious effort to conserve this forest. Plant Inventory has been conducted on July 15-20, 2008, as the first step to prepare establishing the botanic garden. The floristic composition is a basic important data for botanic garden development planning. The result of inventory shows that there were 153 species of 433 individual trees in the plots sampling with total size of 10 ha (3.3% of total area). These species occurred in three-habitat type on the forest area i.e. riparian, freshwater swamp and heat forest. Dipterocarpaceae is the most important family and as an emergent tree in Tomong forest, there were 17 species in 5 genera belongs to this family, with totally 60 individual trees particularly growing on the sites ≥ 50 m asl. Other important families are Leguminosae, Myrtaceae, Euphorbiaceae, and Sapotaceae
Kualitas Air Pasca Pengerukan Alur Transportasi Batu Kapur di Sungai Donan Cilacap
Get PDFRiver Donan has the potential of international ship’s channel due to the availability of industry. Unfortunately, the drift gill net operation was predicted causing river shallowness and disturbing the limestone transportation channel. The aim of research was to know the water quality based on physic, chemical, and biological aspects at the north, central, and south area of dredging; and sediment texture, benthos and plankton as proponent. Survey was done at all areas of dredging from January to March 2008. Water samples were taken according to PPRI Number 82/2001 and the procedure of SNI. Data was analised as descriptive and supported by Sorensen similarity index. The result showed that the concentration of TDS, NH3, Mn and Fe was above levels considered as water quality standard at all areas; even the concentration decreases. On the other hand, increasing the concentration of H2S was only at the central area, whereas the concentration of Pb, silty clay sediment texture, and domination of benthic of Rhinoclavis asper and plankton of Lyngbya spirulinoides were at the central and south areas (similarity index of this research was 95.14%; the research before was 99.15%). The conclusion showed that the dredging did not change the high concentration of TDS because it which was taken along tide was hampered by the net. In addition, the concentration of Pb, silty clay sediment texture, and the dominant benthic and plankton have the same tendencies at the central and south areas