1,721,012 research outputs found
HUBUNGAN ANTARA RASIO OLIGOCHAETA DAN CHIRONOMIDAE DENGAN TINGKAT PENCEMARAN SUNGAI GAJAHWONG, CODE DAN WINONGO
No full textChironomidae mempunyai kisaran toleransi yang sangat luas terhadap kualitas habitat perairan. Namum demikian banyak organisme yang menjadi kompetitor dalam lingkungan habitatnya. Kompetitor kuat dalam sedimen diantaranya adalah cacing Oligochaeta. Permasalahannya adalah seberapa besar hubungan antara rasio Oligochaeta � Chironomidae dengan kualitas habitat di 3 lokasi sungai yang berbeda. Penelitian bertujuan mencari hubungan antara nilai rasio Oligochaeta � Chironomidae dengan tingkat pencemaran perairan sungai sebagai habitatnya. Hasil penelitian dapat digunakan sebagai salah satu acuan pemantauan pencemaran perairan sungai. Pokok penelitian adalah pencuplikan sedimen sungai, identifikasi Oligochaeta dan Chironomidae. Pencuplikan dilakukan di sungai Gajahwong, Code dan Winongo dengan lokasi sebelum, dalam dan sesudah kota. Cara pencuplikan menggunakan sedimen core dengan diameter 2 inchi dengan kedalaman 10 cm. Sedimen disaring dengan saringan nomor 40, Oligochaeta dan Chironomidae diawetkan dan diamati dengan mikroskop. Parameter lingkungan yang diukur adalah DO, CO2, pH, zat organik, COD, NO3, PO4, temperatur air, kecepatan arus dan tekstur substrat. Data diproses dengan analisis regresi-korelasi. Hasil menunjukkan bahwa ada korelasi signifikan antara rasio Oligochaeta � Chironomidae dengan parameter DO, CO2, dan pH, sedangkan dengan COD, NO3 dan zat organik tidak ada korelasi signifikan
Kajian kerapatan dan keanekaragaman zoobenthos di waduk Penjalin, Bumiayu, Jawa Tengah = Study on the density and diversity of zoobenthos in Penjalin Dam, Bumiayu, Central Java
Get PDFABSTRACT:
An exploratory study on the density and diversity of zoobenthos in the Penjalin Dam was done. Zoobemhos was sampled by Ekman\u27s dredging on 50 sites and 5 replications. For preservation, a 4% formalin solution was added into the sample. It was found 12 genera, 11 genera of gastropods and 1 genus of Oligochaeta. There were differences of the density and diversity of zoobenthos in different depth zones.
Keywords : density - diversity - zoobentho
Laporan penelitian studi kepadatan dan keragaman zoobenthos di waduk penjalin, Bumiayu, Jawa Tengah
No full textLAPORAN PENELITIAN KAJIAN BEBERAPA ASPEK EKOLOGI KETAM PASIR ( Emerita sp) DI DAERAH PANTAI SAMAS, BANTUL, DIY
No full textRETAIDDI PERAlRAN PESISIR BARAT.TABLASUPA KABUPATENJAYAPURA,PAPUA (Red-tide at Western Coast of Tablasupa, Jayapura, Papua)
Get PDFRetaid (red-tide) adalah fenomena alam yang sering terjadi baik di perairan laut dan tawar.
Fenomena ini menunjukkan perubahan wama dari bi~ laut menjadi merah, coklat, kuning bahkan
putih susu. Penelitian ini bertujuan untuk mengetahui potensi terjadinya retaid di perairan Tablasupa,
Jayapura, Papua. Pencuplikan plankton dilakukan pada tanggal 8-10 Agustus 2007 di dua lokasi
dengan empat ulangan waktu (pagi, siang, sore dan malam).Hasil analisis laboratorium menunjukkan
adanya 18 genus tetapi hanya dua gen~ yang berpotensi menimbulkan retaid yaitu Ceratium
dan Chaetoceros. Kemungkinan kecil terjadioya retaid di perairan Tablasupa karena kemelimpahan
fitoplankton cukup rendah
BIOAKUMULASI MERKURI DAN STRUKTUR KOMUNITAS GASTROPODA DI KAWASAN BEKAS PENGGELONDONGAN EMAS TRADISIONAL, MUARA SUNGAI LAMPON, BANYUWANGI, JAWA TIMUR
No full textTradistional gold mining at Lampon Banyuwangi district was used mercury amalgamation. Tailings are discharged to waters, that caused mercury pollution. Mercury accumulation can be trace in sediments and benthic organisms such as Gastropods. Although the gold mining has been ceased, the impact of mercury pollution can be traced. This research were aimed to determine the mercury concentration in sediments, determine mercury bioaccumulation in Gastropod�s soft body part, to understand the Gastropods hepatopancreas structure and to understand the community structure in former traditional gold mining Lampon estuary, Banyuwangi. Study site administratively located at Banyuwangi district East Java. The research began in August 2011 until May 2012. The methods of data collection is purpossive random sampling at 3 sites. Mercury analysis using SNI 06.6992.2-2004 methods and than reads by Mercury Analyzer at LPPT UGM Yogyakarta. Hepatopancreas structure of Terebralia sulcata and Nerita argus was preparating with paraffin methods and Hematoxilin Ehrlich�s-Eosin staining method. Accumulation of mercury in the tailings about 137.54 ppm, in sedimens of site I to 0.45 ppm, in sedimens of site II to 65.52 ppm, 1.17 ppm in sediments of site III and in the tailing piles remainings after the mining ceased to 634.19 ppm. Bioaccumulation in Terebralia sulcata 3.10 ppm, Nerita argus to 3.03 ppm and in Patella intermedia 0.44 ppm. The values of mercury accumulation are very high at all. Residual vesicles are found in hepatopancreas of Terebralia sulcata at site I. The residual vesicles are the sign of mercury detoxification proccess. Vesicles are thougt contain inclutions of residual electrons and methallothionine compaction as a result of mercury ions detoxification by hepatopancreas cells. The hepatopancreas tubulus of Nerita argus undergo disintegration and severe athropy. Clumped patterns of the Gastropods distribution are thought to allegedly in response to external factors including mercury pollution and the other resources. The diversity index were in low value, its mean domination by a single species at each site. Nerita argus is the once of the dominating species. Although the accumulation of mercury is high enough and disintegrated hepatopancreas experienced, severe athropy, Nerita argus still exist in this mining region. The gold mining at Lampon is the small gold mining and has been ceased but the pathological effects of mercury pollution on aquatic organisms, espesially Gastropods is very significant
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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