1,720,958 research outputs found
EFEKTIVITAS PEMBERIAN PUPUK ORGANIK CAIR LIMBAH IKAN PATIN TERHADAP BIOMASSA Azolla microphylla PADA MEDIA PEMELIHARAAN IKAN NILA
Full text linkPupuk organik cair (POC) yang terbuat dari limbah ikan patin mengandung nitrogen, fosfat, dan kalium yang dibutuhkan untuk pertumbuhan Azolla microphylla. Tanaman ini dapat dijadikan sebagai pakan tambahan pada budidaya ikan nila dan dapat digunakan untuk memperbaiki kualitas air (fitoremediasi). Penelitian ini bertujuan untuk mengevaluasi pengaruh POC limbah ikan patin (Pangasianodon hypophthalamus) terhadap biomassa A. microphylla pada media pemeliharaan ikan nila. Penelitian ini dilakukan melalui rancangan acak lengkap (RAL), dengan empat taraf perlakuan dan tiga kali ulangan. Perlakuan berupa pemberian POC dari limbah ikan patin dengan volume berbeda, yaitu P0 (tanpa pemberian POC), P1 (0,875 mL L-1), P2(2,625 mL L-1), dan P3 (5,25 mL L-1). Hasil penelitian menunjukkan bahwa pemberian POC limbah ikan patin 2,625 mL L-1 menjadi perlakuan terbaik terhadap pertumbuhan bobot mutlak A. microphylla dengan rata-rata 60 g dan laju pertumbuhan relatif sebesar 1,72 ± 0,09 g hari-1. Pemberian POC memiliki kandungan nutrisi yang tinggi sehingga A. microphylla mampu berkontribusi sebagai pakan alami sebesar 96% serta menghasilkan bobot mutlak ikan nila 1,89 g. Liquid organic fertilizer (LOF) made from catfish waste contains nitrogen, phosphate, and potassium which are needed for the growth of Azolla microphylla. This plant can be used as additional feed in tilapia cultivation and can be used to improve water quality (phytoremediation). This study aimed to evaluate the effects of LOF from catfish (Pangasianodon hypophthalamus) waste on A. microphylla biomass in tilapia rearing media. This experiment was performed through a completely randomized design (CRD), with four treatment levels and three replications. The treatments consisted of administering LOF from catfish waste in different volumes, namely P0 (without administration of LOF), P1 (0.875 mL L-1), P2 (2.625 mL L-1), and P3 (5.25 mL L-1). The results showed that administering 2.625 mL L-1 of LOF from catfish waste was the best treatment for the absolute weight growth of A. microphylla with an average of 60 g and a relative growth rate of 1.72 ± 0.09 g day-1. Administering LOF has a high nutritional content so that A. microphylla is able to contribute 96% as natural food and produces an absolute weight of tilapia of 1.89 g
PEMANFAATAN PUPUK ORGANIK CAIR Azolla sp. TERHADAP KEPADATAN SEL Chlorella sp.
Full text linkPupuk organik cair (POC) Azolla sp. mengandung nutrien yang dibutuhkan untuk pertumbuhan Chlorella sp. sehingga pupuk ini dapat menggantikan pupuk anorganik yang biasa digunakan. Tujuan dari penelitian ini adalah untuk mengetahui manfaat POC Azolla sp. terhadap kepadatan sel Chlorella sp. dan mengetahui dosis terbaik yang dapat digunakan pada kultur mikroalga ini. Penelitian ini dilaksanakan dari bulan Desember 2021 sampai bulan Februari 2022 di Laboratorium Mutu Lingkungan Budidaya, Fakultas Perikanan dan Kelautan, Universitas Riau. Penelitian.ini.menggunakan Rancangan.Acak.Lengkap (RAL) satu faktor.dengan empat.perlakuan dan tiga.kali.ulangan. Perlakukan yang ditetapkan yaitu menggunakan media walne pada P0 (1 mL L-1 sebagai kontrol), menggunakan POC Azolla sp. pada P1 (10 mL L-1), P2 (12 mL L-1), dan P3 (14 mL L-1). Hasil.penelitian menunjukkan bahwa ada manfaat dari POC Azolla sp. terhadap kepadatan sel Chlorella sp. dan perlakuan terbaik untuk kepadatan sel Chlorella sp. adalah P2 dengan dosis POC Azolla sp. 12 mL L-1 dengan mendapatkan kepadatan tertinggi yaitu 904,33x104.sel mL-1 pada hari.ke-7 dan laju pertumbuhan spesifik tertinggi sebesar 0,8439 sel mL-1hari-1. Media kultur Chlorella sp. mengandung nutrien nitrat 1,780-19,384 mg L-1 dan fosfat 0,721-4,380 mg L-1, serta kualitas air pada penelitian termasuk pada kisaran optimal (suhu 28-300C, pH 8,0-8,8, dan oksigen terlarut 5,0-9,1 mg L-1) yang dapat mendukung pertumbuhan Chlorella sp.Liquid organic fertilizer (LOF) Azolla sp. contains nutrients required for the growth of Chlorella sp. This LOF fertilizer could be used replace the commonly used inorganic fertilizers. The objective of this study was to determine the effect of LOF Azolla sp. on Chlorella sp. cell density and its best dose usage in culturing the microalgae. The research.was.conducted from.December.2021 to. February .2022. at the Aquaculture Environmental Quality Laboratory, Fisheries and Marine Faculty, Riau University. The research design used was a one-factor Completely Randomized Design (CRD) consisting of four treatments and three replications. The treatments were the application of Walne media on P0 (1 mL L-1 as a control), and LOF Azolla sp. on P1(10.mL L-1), P2 (12.mL L-1), and P3 (14.mL L-1). The results showed that the use of LOF Azolla sp. had significant influences on the Chlorella sp. cell density of which the best treatment was P2. The P2 treatment (LOF Azolla sp. of 12 mL L-)1 produced the highest density of Chlorella sp. (904.33x104 cells mL-1)on the 7th day with the highest specific growth rate of 0.8439 cells mL-1day-1. Nitrate and phosphate concentrations measured in the Chlorella sp. culture media ranged between 1.780-19.384 mg L-1 and 0.721-4.380 mg L-1, respectively. Water quality of the media was optimal throughout the experimental period where the temperature, pH, and dissolved oyxgen varied between 28-300C, 8.0-9.0, and 6.0-9.1 mg L-1, respectively. This study concludes that LOF Azolla sp. combined with the optimal culture condition improves the growth of Chlorella sp
PENGGUNAAN PUPUK ORGANIK CAIR LIMBAH TAHU DAN AIR KELAPA TERHADAP PERTUMBUHAN Spirulina sp.
No full textKepadatan Spirulina sp. dapat dipengaruhi oleh faktor nutrisi dan lingkungan. Faktor nutrien memiliki peranan penting dalam proses fotosintesis. Penelitian ini bertujuan untuk mendapatkan dosis pupuk organik cair (POC) limbah tahu dan air kelapa yang terbaik terhadap kepadatan Spirulina sp. Penelitian ini dilaksanakan pada tanggal 20 Mei 2022 sampai 28 Juni 2022, di Laboratorium Mutu Lingkungan Budidaya Fakultas Perikanan dan Kelautan, Universitas Riau. Metode yang digunakan adalah metode eksperimen Rancangan Acak Lengkap (RAL) dengan satu factor, yaitu dosis air kelapa terdiri atas 4 perlakuan yaitu : P0: 1 g L-1 POC limbah tahu tanpa air kelapa, P1: 1 g L-1 POC limbah tahu dan 0,25% air kelapa, P2: 1 g L-1 POC limbah tahu dan 0,5% air kelapa, P3: 1 g L-1 POC limbah tahu dan 0,75% air kelapa. Untuk mengurangi tingkat keraguan maka diperlukan ulangan sebanyak 3 kali. Pemeliharaan Spirulina sp. dilakukan selama 25 hari dengan parameter yang diamati yaitu kepadatan Spirulina sp., laju pertumbuhan spesifik, suhu, pH, DO, salinitas, nitrat dan fosfat. Dimana Spirulina sp. didapatkan dari petani Spirulina sp. di Jepara, Jawa Tengah. Bibit yang digunakan sebanyak 66,4 mL dengan kepadatan sebanyak 5.000 ind.mL-1 dimasukan ke dalam wadah dengan kapasitas 2 L. Hasil penelitian menunjukan bahwa ada pengaruh dosis POC limbah tahu dan air kelapa yang berbeda terhadap pertumbuhan Spirulina sp., dimana dosis terbaik dengan kepadatan tertinggi berturut-turut dari P3 sebesar 270,6x104±835,4a ind.L-1, kemudian P2 yaitu 123,0x104±72857,9b ind.L-1, P1 sebesar 51,7x104±6474,0c ind.L-1 , dan P0 12,7x104±1797,2d ind.L-1, dengan laju pertumbuhan spesifik tertinggi mulai dari P3 yaitu 0,8171±0,01a ind.mL-1/hari, P2 0,7315±0,00b ind.mL-1/hari, P1 0,5583±0,02c ind.mL-1/hari, dan P0 0,4122±0,05d ind.mL-1/hari, dengan kisaran kualitas air optimum seperti suhu 27-32 ºC, pH 7,1-8,8, DO 4,2-8,4 mg.L-1, salinitas 25-30 ppt, nitrat 0,340-0,855 mg.L-1 dan fosfat 0,225-0,384 mg.L-1.The density of Spirulina sp. can be influenced by nutritional and environmental factors. Nutrient factors have an important role in the process of photosynthesis. This study aims to obtain the best dose of liquid organic fertilizer (POC) from tofu waste and coconut water on the density of Spirulina sp. This research was conducted from 20 May 2022 to 28 June 2022, at the Aquaculture Environmental Quality Laboratory, Faculty of Fisheries and Marine Sciences, University of Riau. The method used is the experimental method Completely Randomized Design (CRD) with one factor, namely the dose of coconut water consisting of 4 treatments, namely: P0: 1 g L-1 POC of tofu waste without coconut water, P1: 1 g L-1 POC of tofu waste and 0.25% coconut water, P2: 1 g L-1 POC tofu waste and 0.5% coconut water, P3: 1 g L-1 POC tofu waste and 0.75% coconut water. To reduce the level of doubt, it is necessary to repeat 3 times. Spirulina sp. maintenance was carried out for 25 days with observed parameters namely Spirulina sp. density, specific growth rate, temperature, pH, DO, salinity, nitrate and phosphate. Where is Spirulina sp. obtained from Spirulina farmers in Jepara, West Java. 66,4 mL of seeds used with a density of 5,000 ind.mL-1 were put into a container with a capacity of 2 liters. The results showed that there was an effect of different POC doses of tofu waste and coconut water on the growth of Spirulina sp., where the best dose with the hihest density was P3 of 270.6x104±835.4a ind.L-1, then P2 of 123.0x104±72857.9b ind.L-1, P1 of 51.7x104±6474.0c ind.L-1, and P0 of 12.7x104±1797.2d ind.L-1, with a rate of the highest specific growth starting from P3 namely 0.8171±0.01a ind.mL-1/day, P2 0.7315±0.00b ind.mL-1/day, P1 0.5583±0.02c ind.mL-1/day, and P0 0.4122±0.05d ind.mL-1/day, with optimum water quality ranges such as temperature 27-32 ºC, pH 7.1-8.8, DO 4.2 -8.4 mg.L-1, salinity 25-30 ppt, nitrate 0.340-0.855 mg.L-1, and phosphate 0.225-0.384 mg.L-1
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe 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
Full text link“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
Full text linkWe 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
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
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