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Search Results: 1 - 10 of 89 matches for " EKA RURIANI "
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Yeast Isolation for Bioethanol Production
HAYATI Journal of Biosciences , 2012,
Abstract: We have isolated 12 yeast isolates from five different rotten fruits by using a yeast glucose chloramphenicol agar (YGCA) medium supplemented with tetracycline. From pre-screening assay, four isolates exhibited higher substrate (glucose-xylose) consumption efficiency in the reaction tube fermentation compared to Saccharomyces cerevisiae dan Saccharomyces ellipsoids as the reference strains. Based on the fermentation process in gooseneck flasks, we observed that two isolates (K and SB) showed high fermentation efficiency both in sole glucose and mixed glucose-xylose substrate. Moreover, isolates K and SB produced relatively identical level of ethanol concentration compared to the reference strains. Isolates H and MP could only produce high levels of ethanol in glucose fermentation, while only half of that amount of ethanol was detected in glucose-xylose fermentation. Isolate K and SB were identified as Pichia kudriavzeevii (100%) based on large sub unit (LSU) ribosomal DNA D1/D2 region.
ISLAM, ADAT, AND THE STATE: Matrifocality in Aceh Revisited
Eka Srimulyani
Al-Jami'ah : Journal of Islamic Studies , 2010,
Abstract: Matrifocality has been a rooted tradition in the social history of the community in Aceh. The principles of matrifocality have also affected on how women are positioned in the community, and the socio-gender relation within the community. The fact that Aceh has strongly associated to the Islamic values that claimed to support the paternal traditions. Apparently, the Islamic values and the local matrifocality practices juxtaposed through the roles of adat, which considered as inseparable to Islamic law or teaching, or in local term known as zat ngeun sifeut. Another point in revisiting matrifocality in Aceh in Aceh is an examination of how gender state ideology, particularly during the New Order Regime disregarded some local gender practices across some ethnics in the archipelago. Meanwhile, the state also hegemonied and promoted particular gender state ideology such as state ibuism. Nonetheless, the modernity and social changes have also contributed to the shifting of some matrifocality practices in contemporary Acehnese society. However, since the matrifocality has a strong root in the social life of the community, the principles of the matrifocality still survived until currently, although it transformed into ‘new matrifocality’ practices. Keywords: matrifocality, Aceh, gender, shari‘a law
Solvent Extraction of Nickel and Cobalt from Ammonia-Ammonium Carbonate Solution by Using LIX 84-ICNS  [PDF]
Mohammad Zaki Mubarok, Fariza Eka Yunita
International Journal of Nonferrous Metallurgy (IJNM) , 2015, DOI: 10.4236/ijnm.2015.43003
Abstract: In the present paper, separation of nickel and cobalt in ammonia-ammonium carbonate solution that simulates pregnant leach solution of Caron Process by solvent extraction using LIX 84-ICNS was studied. LIX 84-ICNS is a novel extractant which is still being studied, especially for nickel and cobalt separation in ammonia-ammonium carbonate solution. A series of solvent extraction tests were performed at various equilibrium pH, temperature, extractant concentration, and volume ratio of organic to aqueous solution (O/A ratio). The investigation results show that the highest nickel and cobalt extraction percentages of 99.8% and 90.3% were obtained from the extraction test at equilibrium pH of 8.75, temperature of 55°C, extractant concentration of 40% (v/v) and O/A ratio of 1/1, respectively. Oxidation of cobalt in aqueous solution prior to extraction is needed to minimize co-extraction of cobalt. Co-extracted cobalt can be decreased from 90.3% to 30.3% by mixing 1% (v/v) H2O22 in aqueous solution prior to the extraction stage. It was found that nickel and cobalt extractions by LIX 84-ICNS are endothermic processes with enthalpy changes of +171.03 and +7.64 kJ/mole, respectively. Based on constructed McCabe-Thiele Diagram, nickel extraction level of more than 99.9% can be obtained in 2 stages at O/A ratio of 0.5. The highest stripping percentages of nickel and cobalt of 98.82% and 3.16% respectively were obtained at 200 g/l H2SO4 stripping agent.
Development Problem Based Learning to Increase Skill Thinking High Levels  [PDF]
Alben Ambarita, Eka Liana, Chandra Ertikanto
Open Journal of Social Sciences (JSS) , 2018, DOI: 10.4236/jss.2018.610004
Abstract: This development research aims at the realization of the development of teaching materials based on Problem Based Learning to know the practicality and effectiveness of PBL teaching materials to improve high thinking skills of fourth grade students of elementary school. The research method used is research development (Development and Development) by using research steps according to Borg and Gall. The population in this research is the fourth grader of elementary school in one cluster of Kalianda District and the sample of the research is 28 fourth graders of elementary school. Data collection techniques in this study were conducted by the documentation, observation, expert validation sheet, questionnaire needs analysis, and tests. The results showed that the teaching materials developed can improve the ability of high-level thinking and learning outcomes of learners who have been analyzed using N-Gain.
Stillbirths at the Jos University Teaching Hospital: Incidence, risk, and etiological factors
JT Mutihir, PO Eka
Nigerian Journal of Clinical Practice , 2011,
Eka Rahayu Utami
Jurnal Biologi el-Hayah , 2011,
Abstract: Masalah resistensi bakteri terhadap antibiotika telah menjadi masalah internasional. Saat ini sedang digalakkan kampanye dan sosialisasi pengobatan secara rasional yang meliputi pengobatan tepat, dosis tepat, lama penggunaan yang tepat serta biaya yang tepat. Bakteri menjadi resisten untuk dapat bertahan hidup setelah melalui beberapa proses tertentu. Banyak hal yang bisa mendukung terjadinya resistensi.Pada akhirnya konsekuensi yang ditimbulkan sangat merugikan baik dari segi kesehatan, ekonomi maupun kesehatan masyarakat.Terapi rasional, regulasi pemerintah, juga edukasi masyarakat menjadi beberapa poin penting dalam stategi penanganan masalah resistensi ini.
Julia Eka Rini
K@ta : a Biannual Publication on the Study of Language and Literature , 2007,
Abstract: Training students to transfer the message and meaning of the English source text to the Indonesian target text is not an easy task. Various difficulties and mistakes can occur. Students still have difficulties in understanding the text and in restructuring it into good Indonesian language. They still need to do a lot of exercises in transferring the meaning of the words, group of words or sentences.
Julia Eka Rini
K@ta : a Biannual Publication on the Study of Language and Literature , 2000,
Abstract: This article aims at giving examples of characteristics of simplification in Bahasa Indonesia and proving that child language has a pattern and that there is a process in learning. Since this is a case study, it might not be enough to say that simplification is universal for all children of any mother tongues, but at least there is a proof that such patterns of simplification also occur in Bahasa Indonesia.
Compositions in English: Comparing the Works of Monolinguals, Passive Bilinguals, and Active Bilinguals
Julia Eka Rini
K@ta : a Biannual Publication on the Study of Language and Literature , 2010,
Abstract: This study tries to see whether the subjects’ “monolingualism” and “bilingualism” (monolinguals learning an L2 and bilinguals learning an L3) influence their study on English, especially writing. The term “bilinguals” also means “multilinguals” in this study. Bilinguals in this paper are classified into two; first, passive bilinguals who are only exposed to another local language, besides speaking Bahasa Indonesia at home, and second, active bilinguals who are exposed to and also speak other language(s) and Bahasa Indonesia at home. The findings show that the monolingual and the active bilingual are better than the passive one; the active bilingual is better than the monolingual. However, if the passive and the active bilingual are combined, the monolingual is better than the bilinguals.
Julia Eka Rini
K@ta : a Biannual Publication on the Study of Language and Literature , 2001,
Abstract: The article aims at giving several considerations in developing materials for Introduction to Communication, a new subject of elective package at English Department of Petra Christian University. Principles of material design used are the one identified by Nunan (1988). In this article a sample lesson is included.
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