1,720,981 research outputs found
Eksplorasi dan Karakterisasi Bakteri Penghasil Eksopolisakarida dari Tanah di Kalimantan Barat untuk Peningkatan Agregasi Tanah Berpasir.
No full textEksopolisakarida (EPS) adalah senyawa kompleks makro-molekul
elektrolit yang terkandung dalam sel-sel luar bakteri yang diekskresikan sebagai
lendir dan memiliki peran dalam agregasi tanah. Spodosol memiliki faktor
pembatas agregasi yang sangat tidak stabil. Partikel tanah lepas dari satu sama lain
sehingga kemampuan menahan air dan nutrisi rendah. Penelitian ini bertujuan
untuk meningkatkan kapasitas tanah bertekstur pasir sebagai media pertumbuhan
tanaman karet melalui peningkatan agregasi, retensi air dan hara dengan
memanfaatkan bakteri penghasil eksopolisakarida. Penelitian ini dilakukan dalam
beberapa tahap yaitu isolasi dan seleksi, karakterisasi dan identifikasi, pengujian
agregasi di laboratorium dan tanaman karet.
Hasil penelitian ini ditemukan 112 isolat yang diisolasi dari rhizosfer tanaman
karet, hutan sekunder dan semak belukar (masing-masing RB, HS, SB) dari sampel
tanah PT. Hutan Ketapang Industri, Ketapang, Kalimantan Barat. Berdasarkan
pengamatan morfologi koloni adalah isolat menghasilkan bakteri exopolisakarida
yang mampu menghasilkan lendir yang tebal dan lebar. Hasil pengujian pada
media cair ATCC 14 diperoleh tiga isolat potensial dalam menghasilkan
exopolisakarida, yaitu isolat RB292 (7.53 mg mL-1), RB51 (7.55 mg mL-1) dan
RB241 (7.59 mg mL-1) dengan 2% sumber karbon sukrosa dan meningkatkan
kemantapan agregat tanah sangat nyata dengan nilai indek kemantapan agregat
tanah 41.01%-47.87% meningkat dari 30.61% dengan penambahan bahan organic
sebesar 2%. Hasil identifikasi molekuler menunjukkan bahwa ketiga isolat tersebut
adalah Burkholderia anthina, Klebsiella sp dan Klebsiella pneumoniae.
Penggunaan Klebsiella sp untuk agregasi pasir terbukti efektif dalam
pembentukan agregasi pada tanah dengan kadar pasir 91,70%. dan meningkatkan
pertumbuhan tanaman karet dengan perlakuan 100% NPK dan tanpa perlakuan
NPK pada tanaman umur 2 bulan
Characterization of Petroleum Hydrocarbon Decomposing Fungi Isolated from Mangrove Rhizosphere
No full textCharacterization of Petroleum Hydrocarbon Decomposing Fungi Isolated from Mangrove Rhizosphere
No full textThe research was done to obtain the isolates of soil borne fungi isolated from mangrove rhizosphere which were capable of degrading petroleum hydrocarbon compounds. The soil samples were collected from South Sumatra mangrove forest which was contaminated by petroleum. The isolates obtained were selected based on their ability to survive, to grow and to degrade polycyclic aromatic hydrocarbons in medium containing petroleum residue. There were 3 isolates of soil borne hydrocarbonoclastic fungi which were able to degrade petroleum in vitro. The 3 isolates were identified as Aspergillus fumigates, A. parasiticus, and Chrysonilia sitophila. C. sitophila was the best isolate to decrease total petroleum hydrocarbon (TPH) from medium containing 5-20% petroleum residue
Eksplorasi dan Karakterisasi Bakteri Penghasil Eksopolisakarida dari Tanah di Kalimantan Barat untuk Peningkatan Agregasi Tanah Berpasir
No full textEksopolisakarida (EPS) adalah senyawa kompleks makro-molekul
elektrolit yang terkandung dalam sel-sel luar bakteri yang diekskresikan sebagai
lendir dan memiliki peran dalam agregasi tanah. Spodosol memiliki faktor
pembatas agregasi yang sangat tidak stabil. Partikel tanah lepas dari satu sama lain
sehingga kemampuan menahan air dan nutrisi rendah. Penelitian ini bertujuan
untuk meningkatkan kapasitas tanah bertekstur pasir sebagai media pertumbuhan
tanaman karet melalui peningkatan agregasi, retensi air dan hara dengan
memanfaatkan bakteri penghasil eksopolisakarida. Penelitian ini dilakukan dalam
beberapa tahap yaitu isolasi dan seleksi, karakterisasi dan identifikasi, pengujian
agregasi di laboratorium dan tanaman karet.
Hasil penelitian ini ditemukan 112 isolat yang diisolasi dari rhizosfer tanaman
karet, hutan sekunder dan semak belukar (masing-masing RB, HS, SB) dari sampel
tanah PT. Hutan Ketapang Industri, Ketapang, Kalimantan Barat. Berdasarkan
pengamatan morfologi koloni adalah isolat menghasilkan bakteri exopolisakarida
yang mampu menghasilkan lendir yang tebal dan lebar. Hasil pengujian pada
media cair ATCC 14 diperoleh tiga isolat potensial dalam menghasilkan
exopolisakarida, yaitu isolat RB292 (7.53 mg mL-1), RB51 (7.55 mg mL-1) dan
RB241 (7.59 mg mL-1) dengan 2% sumber karbon sukrosa dan meningkatkan
kemantapan agregat tanah sangat nyata dengan nilai indek kemantapan agregat
tanah 41.01%-47.87% meningkat dari 30.61% dengan penambahan bahan organic
sebesar 2%. Hasil identifikasi molekuler menunjukkan bahwa ketiga isolat tersebut
adalah Burkholderia anthina, Klebsiella sp dan Klebsiella pneumoniae.
Penggunaan Klebsiella sp untuk agregasi pasir terbukti efektif dalam
pembentukan agregasi pada tanah dengan kadar pasir 91,70%. dan meningkatkan
pertumbuhan tanaman karet dengan perlakuan 100% NPK dan tanpa perlakuan
NPK pada tanaman umur 2 bulan
Synergism of Wild Grass and Hydrocarbonoclastic Bacteria in Petroleum Biodegradation
Get PDFThe concept of plants and microbes utilization for remediation measure of pollutant contaminated soil is the newest development in term of petroleum waste management technique. The research objective was to obtain wild grass types and hydrocarbonoclastic bacteria which are capable to synergize in decreasing petroleum concentration within petroleum contaminated soil. This research was conducted in a factorial by using a randomized completely block design. The first factor was wild grass type which were without plant, Tridax procumbens grass and Lepironia mucronata grass. The second factor was hydrocarbonoclastic bacteria type which were without bacterium, single bacterium of Alcaligenes faecalis, single bacterium of Pseudomonas alcaligenes, and mixed bacteria of Alcaligenes faecalis with P. alcaligenes. The results showed that mixed bacteria (A. faecalis and P. alcaligenes) were capable to increase the crown and roots dry weights of these two grasses and bacteria population, decreased percentage of TPH (total petroleum hydrocarbon) and had better pH value than that of single bacterium. The highest TPH decrease with magnitude of 70.1% was obtained on the treatment of L. mucronata grass in combination with mixed bacteria
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Get PDF“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Get PDFWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
PERTUMBUHAN DAN KADAR HARA NPK TANAMAN KELAPA SAWIT DENGAN DAN TANPA APLIKASI DECANTER SOLID
No full text Oil palm is a widely cultivated plantation crop in Indonesia. Oil palm production is influenced by fertilizers. One of the organic wastes that can be used as fertilizer is a solid decanter. The purpose of this study was to determine the differences in growth and nutrient content of N, P and K in plants with solid decanters and those not. The research was carried out from October 2019 to March 2020 at PT. Sampoerna Agro Tbk, Mesuji Garden, Mesuji District, Ogan Komering Ilir Regency, South Sumatra. This study uses the t test with independent samples. Samples of oil palm plants used are immature oil palm plants (TBM) aged 2 years in blocks 13A and 18A which have been fertilized by NPK according to recommendations and in block 13A have been given a solid decanter of 15 tons ha-1. The results showed that plants that were applied solid decanter gave a significant difference response to plants that were not given solid decanter on the variable number of leaves, number of midribs and plant height and on nutrient levels of P and K with t test values of 0.001, 0.000, and 0.003 for variables growth and 0.006 and 0.000 in nutrient content variables. Based on the physical form, it also shows that plants that have solid decanter application have better shape, size and plant freshness than plants that are not applied with solid decanter. Oil palm is a widely cultivated plantation crop in Indonesia. Oil palm production is influenced by fertilizers. One of the organic wastes that can be used as fertilizer is a solid decanter. The purpose of this study was to determine the differences in growth and nutrient content of N, P and K in plants with solid decanters and those not. The research was carried out from October 2019 to March 2020 at PT. Sampoerna Agro Tbk, Mesuji Garden, Mesuji District, Ogan Komering Ilir Regency, South Sumatra. This study uses the t test with independent samples. Samples of oil palm plants used are immature oil palm plants (TBM) aged 2 years in blocks 13A and 18A which have been fertilized by NPK according to recommendations and in block 13A have been given a solid decanter of 15 tons ha-1. The results showed that plants that were applied solid decanter gave a significant difference response to plants that were not given solid decanter on the variable number of leaves, number of midribs and plant height and on nutrient levels of P and K with t test values of 0.001, 0.000, and 0.003 for variables growth and 0.006 and 0.000 in nutrient content variables. Based on the physical form, it also shows that plants that have solid decanter application have better shape, size and plant freshness than plants that are not applied with solid decanter. Keywords: Oil palm, Decanter Solid, Growth, Nutrient Conten
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