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BIOMA
Published by Universitas Diponegoro
BIOMA (ISSN 1410-8801) adalah Majalah Ilmiah Biologi yang bertujuan mewadahi semua informasi hasil penelitian, telaah pustaka, makalah teknis, dan kajian buku, dari berbagai cabang ilmu Biologi. Diharapkan penerbitan ini dapat berkontribusi dalam penyampaian informasi ilmiah yang merupakan mata rantai proses kegiatan ilmiah. Terbit sejak tahun 1999.
Articles by issue : Vol. 09, No. 2, Tahun 2007
6
Articles
Distribusi dan Kemelimpahan Meiofauna di Hulu Sungai Code Yogyakarta

Hariyati, Riche -

Bioma Vol. 09, No. 2, Tahun 2007
Publisher : Bioma

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Abstract

This research is aimed to study distribution and abundance of meiofauna and the quality of physicochemicalcharacteristics of uppersite of code river and up stream river code Yogyakarta province. Samples weretaken using modified Pysto style corer and were located based on habitat types specific river, which are pool, riffle,rapid, left side and right side of water column. Sample taken four times for each zone. The parameter of for waterquality measured were dissolved oxygen. Water current, alkalinity and pHResult from the analysis showed that the abundance of meiofauna at code river the highest at left side zone.Which was 537.806 individu/m3 with relative abundance was 28,09% result from physico chemical parameter ofdissolved oxygenbetween 5,44 ppm – 6,0 ppm, alkalinity 20 ppm – 25 ppm , pH 7,10 – 7,18.and watercurrenntmeasured between 0,03 m/sec – 0,49 m/sec. The abundance of meiofauna at code river was dominated bygroup of Nematodes horizontal distribution of the fauna was the widest for Nematodes ostracoda, Rhizopoda andinsecta. Physico chemicalquality of code river water was relative good for meiofauna habitat and other waterorganisms

`Kandungan Protein dan Abu Tanaman Alfalfa( Medicago sativa L) setelah Pemupukan Biorisa

Parman, Sarjana -

Bioma Vol. 09, No. 2, Tahun 2007
Publisher : Bioma

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Abstract

The reasearch is about protein and ash content in Alfalfa ( M.sativa L ) after fertilization bioriza-02. Thisresearch is in polibag plastic in 15 March-15 August 2006, using to research design RAL ( Randomized CompleteDesign ), Treatmen is give fertilization biorisa–02 , one treatment is Po ( without biorisa ) P1 ( Biorisa-02 0,5 caps/plant ), P2 (1 caps/plant); P3;(11/2 caps/plant) and P4 (2 caps / plant) every treatment repeated five times . Proteinconternt and ash analysed follow of makro-Kjeldahl which modification (AOC, 1970 in Sudarmaji, 1984). The resultof research indicated that increase of dose of fertilization biorisa-02 will boost up rate of protein of crop alfalfa,though fertilization of dose Po (without biorisa–02 caps/plant) 18,472 mg/100 of gram differ is not real by control18.264; so also fertilization 1 caps/plant ( 20,786 ) differing is not real with fertilization have dose (20,82) but differreality with gift fertilize to have dose 2 mg/plant (21,828)

Kemampuan Bakteri Asam Laktat Dalam Menghambat Pertumbuhan dan Produksi Aflatoksin B2 Aspergilllus flavus

Lunggani, Arina Tri

Bioma Vol. 09, No. 2, Tahun 2007
Publisher : Bioma

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Abstract

Aflatoxins are highly toxic secondary metabolies produced during the growth of several fungi, especiallyAspergillus flavus. AFB1 and AFB2 one of them which contaminates a wide variety of food and feed causing serioushealth problem when consumed by human or animals. This research was aimed to study the potency of Lactic AcidBacteria (LAB) in the inhibition of Aspergillus flavus growth and the production of Aflatoxin B2. Three species ofLAB i.e. Lactobacillus delbrueckii , L. fermentum, L. plantarum were investigated for their potential in inhibitingand degradation of Aflatoxin B2 as well as inhibiting fungal growth. The trial was designed into three variations ofeach isolate by challenging the fungal culture, before fungal inoculation, at the same time as fungal inoculation andafter fungal inoculation. It was found that all the three species of LAB are potential microorganism to inhibitfungal growth as indicated by the reduction of the dry weight of fungal mycelia compared with control.Quantification of Aflatoxin B2 showed that L. fermentum gave the strongest degradation of Aflatoxin B1 during 15days incubation, then followed by L. plantarum and L delbruekii with a reduction rate of 0,,2408 ppm, 0,3373 ppm,0,6393 ppm respectively, compared with control these are significantly different. These result conclude thatAflatoxin B2 can be degraded or prevented to be produced by A. flavus by applying LAB.

Pengaruh Pepton dan Waktu Inkubasi terhadap Produksi Inulinase oleh Pichia alni DUCC-W4 Berbahan Dasar Tepung Umbi Dahlia (Dahlia variabilis Willd.)

-, Wijanarka -, Rukmi, MG Isworo, Sutrisna, Lynda -

Bioma Vol. 09, No. 2, Tahun 2007
Publisher : Bioma

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Abstract

Sumber pemanis alami alternatif yang aman bagi kesehatan dapat diproduksi dari inulin dalam umbi dahlia(Dahlia variabilis Willd.) dan dapat dihidrolisis dengan inulinase dari Pichia alni DUCC-W4. Peningkatan produksiinulinase dapat dilakukan dengan menambahkan sumber nitrogen organik berupa pepton ke dalam medium. Hasilpenelitian menunjukkan aktivitas inulinase tertinggi sebesar 1,237 IU/mL (P2T3), aktivitas invertase tertinggi sebesar1,568 IU/mL (P2T3) dan aktivitas katalitik inulinase sebesar 0,824 IU/mL (P2T2) diperoleh melalui rasio S/I denganmembandingkan aktivitas invertase (S) dan aktivitas inulinase (I). Kesimpulan dari penelitian ini adalah penambahanpepton dengan berbagai konsentrasi (0%; 0,5% dan 1%) dan lama waktu inkubasi (12 jam, 18 jam dan 24 jam)tidak meningkatkan produksi inulinase Pichia alni DUCC-W4.

Peningkatan Produktivitas Tanah Pasir untuk Pertumbuhan Tanaman Kedelai dengan Inokulasi Mikorhiza dan Rhizobium

Saptiningsih, Endang -

Bioma Vol. 09, No. 2, Tahun 2007
Publisher : Bioma

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Abstract

Mycorhiza and Rhizobium were potensial soil nutrient-enriched organisms. This research was purposed tostudy effect of Mycorrhiza and Rhizobium inoculation in increasing the productivity of sand soil for the growth ofsoybean crops. This research arranged with four treatments: without inoculation(Po), with rhizobium inoculation(Pr), with micorrhiza inoculation (Pm), with micorrhiza-rhizobium inoculation (Pmr). The data that was analysed byANAVA and DMRT at 5% level test. The result of study showed that the productivity of the sand soil could beincreased with mikorhiza and rhizobium inoculation indicated by increasing of soybean growth.

Skreening Potensi Antibakteri pada Beberapa Spesies Rumput Laut terhadap Bakteri Patogen pada Udang Windu

Izzati, Munifatul -

Bioma Vol. 09, No. 2, Tahun 2007
Publisher : Bioma

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Abstract

Antibacterial activity of several local seaweeds has been screened. Most of these seaweeds species showantibacterial properties against pathogenic bacteria from species of Vibrio and Pseudomonas. The activity ofseaweeds extracts were determined by type of solvent used in extraction. Respond of each pathogenic bacteria werealso different to each type of extract. Most seaweeds show stronger activity against Pseudomonas rather than Vibrio.Caulerpa and Padina were more active against Pseudomonas compared to Sargassum and Gelidium. Compared toother seaweeds, Sargassum and Gelidium were more active against Vibrio. It is predicted that Sargassum is the themost suitable to be used in polyculture with tiger shrimp (Peneaus monodon), as this is the most active against themost dangerous pathogenic bacteria, Vibrio harveyi. Beside that, the active component of Sargassum is solved inwater, therefore will be easier to diffuse into shrimp pond.