1,721,007 research outputs found
Produksi Mikroalga sebagai Biofuel
Get PDFBiofuel yang berasal dari tanaman darat atau laut seperti mikroalga sudah mulai diupayakanuntuk menjadi energi alternatif pengganti minyak bumi. Berdasarkan hasil penelitian, diketahuibahwa minimal 14 spesies mikroalga berpotensi untuk menghasilkan biofuel dengan kandunganminyak antara 15–77% dari bobot kering mikroalga. Untuk menghasilkan 1 kg (bk) biomassadiperlukan media tumbuh air laut sebanyak 1m3. Di samping kandungan minyaknya dapatdiekstrak, limbah padatnya juga dapat dipergunakan untuk pakan ternak atau bahan bakufermentasi untuk menghasilkan biomethane. Tantangan yang dihadapi dalam meningkatkanproduksi biomassa mikroalga adalah ketersediaan karbon dioksida. Selain itu, dalam prosesekstraksi juga diperlukan suatu alat yang dapat memecah dinding sel mikroalga sehinggakandungan minyaknya dapat diekstrak semaksimal mungkin
Lepidocybium flavobrunneum as a resource of essential fatty acids
Get PDFLepidocybium flavobrunneumis a pelagic fish with high economical value. Its high price isdue to its nutritional contents that comprise of high unsaturated and low saturated fatty acids. It isreported that the total contents of Saturated Fatty Acids (SFA) in Lepidocybium flavobrunneumisonly 2.9%, while the amount of Unsaturated Fatty Acids are 97.06% that consist of 8.32% ofpolyunsaturated (PUFA) and 88.74% of Monounsaturated Fatty Acids (MUFA). Approximately,0.05% of linolenic acids -3 (C18:3), 0.51% of eicosatrienoic acids -3 (C20:3) and 1.98% ofdocosahexanoic acids -3 (C22:6) comprise the PUFAs; whereas the MUFAs is composed by84.71% of oleic acids -9 (C18:1) and 0.27% of nervonoic acids -9 (C24:1). -6in Lepidocybiumflavobrunneum contains 0.46% of linoleic acids -6 (C18:2), 0.72% of arachidonic acids -6(C20:4) and 0.01% of lauric acids (C20:0)
PROSPEK PEMANFAATAN RUMPUT LAUT SEBAGAI BAHAN PUPUK ORGANIK
Get PDFRumput laut tidak hanya dapat digunakan sebagai bahan pangan tetapi juga dapat digunakan sebagai pupuk organik karena rumput laut banyak mengandung trace mineral (Fe, B, Ca, Cu, Cl, K, Mg, dan Mn) dan juga zat pengatur tumbuh (ZPT) seperti auksin, sitokinin, dan giberilin yang berguna untuk memacu pertumbuhan dan meningkatkan produksi tanaman. Kandungan ZPT tersebut banyak terdapat pada thallus (batang) rumput laut dan juga di dalam SAP (konsentrat cair yang mengandung ZPT dan mineral yang berasal dari dalam thallus/xylemcells tanaman) rumput laut. Keistimewaan rumput laut sebagai pupuk organik adalah kandungan ZPT nya yang dapat meningkatkan produksi buah, sayuran, bunga, serta memperpanjang usia tanaman. Di samping itu, ZPT juga dapat meningkatkan daya tahan tanaman dari kekeringan, serangan serangga, dan memperbaiki struktur tanah. Penggunaan rumput laut sebagai bahan dasar pupuk saat ini belum banyak dimanfaatkan, sementara estimasi produksi rumput laut Sargassum sp. dan Eucheuma sp. sebesar 482.400 ton/thn. Apabila produksi tersebut terdiri dari 50% Sargassum sp. yang selama ini belum dimanfaatkan dan digunakan sebagai pupuk maka akan dapat mensubstitusi pupuk kimia sebanyak 242.200 Metric Ton (MT), sedangkan dari rumput laut Eucheuma sp. dengan estimasi produksi 242.200 MT dapat menghasilkan 30% cairan SAP atau setara dengan 72.660 L pupuk cair
Liquid organic fertilizer from seaweed (Sargassum sp.)and fish waste hydrolysate
Get PDFThe combination of seaweed Sargassum sp. and fish waste hydrolysate can be used as anorganic fertilizer, both in liquid or solid forms. The organic fertilizer has a complete macro andmicro nutrients. It contains growth hormone factor such as auxin, cytokinine (zeatin and kinetin)and giberelin. The function of growth hormone factor in plants is to enhance the roots, stems, andleaves expansion, as well as to increase fruit production. To produce liquid organic fertilizer,seaweed has to be hydrolyzed in alkaline condition, meanwhile solid waste of fish has to behydrolyzed in acid condition. The liquid organic fertilizer had protein value of 0.08% or equal to0.012% N, 0.13% P, 1.22% K, 0.06% Ca, 0.17% Mg, 55.04% Fe, 122.75 ppm Mn, 1.95 ppm Cu,24.59 ppm Zn, 13 ppm B, and 18% alginic acid. It had auxin (IAA) of 91.48 ppm, cytokinine of84.71 ppm kinetin and of 70.27 ppm zeatin and giberellin (GA3) of 107.72 ppm
MEMBUAT ALGINAT DARI RUMPUT LAUT SARGASSUM
No full textIndonesia merupakan salah satu negara penghasil dan pengekspor rumput laut terbesar di dunia. Beberapa jenis rumput laut Indonesia bernilai ekonomis, bahkan sudah diperdagangkan ke negara lain. Namun demikian, beberapa spesies khususnya dari kelompok rumput laut cokelat penghasil alginat belum diusahakan secara optimal dan pemanfaatannya masih sangat rendah. Pemanfaatan alginat cukup luas, balk dalam industri pangan maupun non pangan. Sampai saat ini penyediaan alginat di Indonesia masih diimpor dari negara lain.Alginat digunakan dalam industri pangan dan non pangan. Industri pangan misalnya, digunakan sebagai penstabil emulsi pada es krim, pensuspensi pada susu cokelat, dan pengatur kekentalan padayoghurt dan saus. Pada industri non-pangan, alginat digunakan pada pasta pencapan (textile printing) sebagai pengental, pada industri kertas sebagai pengatur keseragaman dan kehalusan permukaan kertas. Buku ini disusun dengan praktis sebagai petunjuk91 hlm. ; illus. 12 x 23 c
usage hydraulic press to separate sap from Eucheuma cottonii
Get PDFFunction of hydraulic press in fresh handling of seaweed is to separate sap from its thallus tofasten its drying process. A device model of hydraulic press has been developed at the ResearchCenter for Marine and Fisheries Product Processing and Biotechnology with a pressure energy(force power) of 30 tons at 4 kWh. During the use of force power of 10 tons/900 cm2for 10 minutesfor 10 kg of seaweed, 20.6% of sap was obtained. Sap is known to contain 2,000 ppm of auxin,1,500 ppm of giberelin (GA3), 1,200 ppm of zeatin and 1,000 ppm of kinetine. In horticulture, ithas been applied to promote growth rate in plants and to increase the production of fruits
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
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