1,720,957 research outputs found
Penggunaan dan Pemanfaatan Tumbuhan Obat di Pekarangan Rumah bagi Ibu-ibu PKK Desa Winebetan Kecamatan Langowan Selatan Kabupaten Minahasa, Provinsi Sulawesi Utara
Full text linkTelah dilakukan pelaksanaan kegiatan program kemitraan masyarakat (PKM) tentang pengabdian kepada masyarakat pada Ibu-ibu PKK Desa Winebetan Kecamatan Langowan Selatan Kabupaten Minahasa dalam Penggunaan dan Pemanfaatan Tumbuhan Obat di Pekarangan Rumah. Kegiatan ini dilaksanakan dengan baik dengan memberikan pengetahuan, penyuluhan serta pelatihan mengenai memanfaatkan pekarangan rumah untuk dijadikan Apotik hidup dan poses pembuatan tanaman obat yang dikembangkan dalam menghasilkan suatu produk serbuk tanaman obat. Hal ini dapat menambah nilai tambah ibu-ibu PKK di desa Winebetan dimana Tanaman obat di pekarangan rumah dapat dimanfaatkan sebagai bahan dasar untuk pembuatan simplisia/serbuk tanaman obat/makanan yang dapat menambah nilai ekonomi bagi masyarakat pada masa pandemi covid-19
Uji Aktivitas Antibakteri Fraksi Daun Sesewanua (Clerodendron squamatum Vahl.) Terhadap Bakteri Streptococcus mutans dan Escherichia coli
Full text linkTelah dilakukan penelitian mengenai kandungan total fenolik, flavonoid dan tanin terkondensasi dari hasil pemisahan kromatografi kolom dan uji aktivitas antibakteri fraksi daun sesewanua terhadap bakteri Streptococcus mutans dan escherecia coli. Pemisahan kromatografi kolom dimulai dengan proses ekstraksi maserasi menggunakan pelarut metanol. Hasil penelitian menunjukkan bahwa kandungan total fenolik tertinggi pada fraksi metanol yaitu 135,497 mg/g, kandungan total flavonoid tertinggi pada fraksi etil asetat yaitu 102,647 mg/g dan kandungan total tanin terkondensasi tertinggi pada fraksi metanol yaitu 53,543 mg/g. Â Uji aktivitas antibakteri menggunakan konsentrasi fraksi 40%, 60% dan 80% dilakukan sebanyak tiga kali pengulangan. Larutan DMSO 10% digunakan sebagai kontrol negatif dan kloramfenikol sebagai kontrol positif. Hasil menunjukkan bahwa fraksi n-heksana tidak memiliki zona hambat sedangkan fraksi etil asetat dan fraksi metanol daun sesewanua dapat menghambat bakteri Streptococcus mutans dan Escherecia coli. Konsentrasi fraksi 80% menunjukkan zona hambat yang paling besarResearch has been conducted on the total content of phenolics, flavonoids and condensed tannins from the results of column chromatography separation. Antibacterial activity test of leaf fractions was also performed against Streptococcus mutans and Escherecia coli. The separation of column chromatography was initialized with the process of maceration using methanol as solvents. The highest total phenolic content obtained in the methanol fraction was 135.497 mg/g, the highest total flavonoid content obtained in the ethyl acetate fraction was 102.647 mg/g and the highest total condensed tannin content in the methanol fraction was 53.543 mg/g. Antibacterial activity test was done triplicates using the 40%, 60% and 80% fraction. DMSO 10% was apllied as the negative control and chloramphenicol as the positive control. The results showed that the n-hexane fraction did not have an inhibition zone while the ethyl acetate fraction and the methanol fraction of the leaves can inhibit Streptococcus mutans and Escherecia coli. Moreover, 80% fraction showed the largest inhibition zone
UJI AKTIVITAS ANTIOKSIDAN DAN TOTAL FLAVONOID PADA EKTRAK ETANOL PINANG YAKI (Areca vestiaria)
Full text linkThis study aims to determine the antioxidant activity of the ethanol extract in fresh Pinang Yaki(Areca vestiaria) seeds and the total content of flavonoid compounds. Total Antioxidant test usedFerric Reducing Antioxidant Power (FRAP) method and Chang method, 2002, for calculate thetotal flavonoids and for test the antioxidant activity. Result from this study showed that theantioxidant activity of fresh samples is 3.80375 mmol/100g and the total flavonoids in freshsamples is 7.2374 mg / kg.Keywords : fresh samples of Pinang Yaki (Areca vestiaria), Antioxidant, total flavonoids, FerricReducing Antioxidant Power (FRAP
Isolasi dan identifikasi senyawa antibakteri dari ganggang laut Dictyota dichotoma (Hudson) Lamouroux
No full textSkrining Fitokimia dan Uji Aktivitas Antioksidan Fraksi Pelarut dari Ekstrak Metanol Batang Pandan Wangi (Pandanus amaryllifolius Roxb)
Full text linkTelah dilakukan penelitian mengenai skrining fitokimia dan uji aktivitas antioksidan fraksi pelarut dari ekstrak metanol batang pandan wangi. Metode ekstraksi yang digunakan adalah microwave dengan menggunakan pelarut metanol. Penelitian ini terdiri dari tahap preparasi, ekstraksi, fraksinasi dan analisis. Fraksi pelarut diantaranya fraksi n-heksan (FNH), fraksi etil asetat (FEA), fraksi Metanol (FM) dan fraksi air (FA) kemudian diuji skrining fitokimia dan aktivitas antioksidan menggunakan metode DPPH. Hasil penelitian menunjukkan bahwa skrining fitokimia pada fraksi pelarut dari ekstrak metanol batang pandan wangi, dimana FNH positif mengandung senyawa (alkaloid, saponin, steroid, triterpenoid, dan tanin), untuk FEA positif mengandung senyawa (alkaloid, flavonoid, saponin, dantanin), untuk FM positif mengandung senyawa (alkaloid, flavonoid, dan saponin), sedangkan FA positif mengandung senyawa (alkaloid). Hasil pengujian aktivitas antioksidan (DPPH) dari fraksi pelarut batang pandan wangi dengan konsentrasi 500 µg/mL, yang paling tinggi terdapat pada FEA sebesar 71,36%, diikuti oleh FA sebesar 70,70%, FM sebesar 51,89%, dan yang terendah pada FNH sebesar 28,90%. Sedangkan konsentrasi 1000 µg/mL, yang paling tinggi terdapat pada FEA sebesar 82,34%, diikuti oleh FA sebesar 78,03%, FM sebesar 65,97%, dan yang terendah pada FNH sebesar 43,95%
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
- …
