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DAMPAK VARIASI WAKTU PAPARAN MEDAN MAGNET ELF (EXTREMELY LOW FREQUENCY) TERHADAP VIABILITAS BENIH TUA PADI (Oryza sativa L.)
No full textABSTRAK
Penurunan viabilitas benih padi (Oryza sativa L.) selama
penyimpanan merupakan permasalahan serius dalam budidaya padi
yang disebabkan oleh berbagai faktor, termasuk kerusakan
membran sel dan peningkatan produksi reactive oxygen species
(ROS). Medan magnet ELF dapat meningkatkan kualitas benih
secara ramah lingkungan dengan mengaktifkan respons sel dan
memperbaiki membran. Medan magnet juga dapat mempercepat
metabolisme dan pertumbuhan tanaman melalui perubahan laju
elektron dalam sel. Penelitian ini bertujuan untuk menganalisis
efek induksi medan magnet ELF 0.2 mT terhadap viabilitas benih
tua tanaman padi (Oryza sativa L.). Penelitian ini menggunakan
Rancangan Acak Lengkap dengan empat perlakuan waktu paparan
yaitu kontrol (M0), 3 menit 54 detik (M1), 7 menit 48 detik (M2),
dan 11 menit 42 detik (M3) yang diulang empat kali sehingga
menghasilkan 16 unit percobaan. Sampel yang digunakan yaitu
benih padi varietas Inpari 32 HDB berusia 8 bulan, dengan total
sampel sebanyak 800 butir. Analisis data menggunakan One Way
ANOVA dan uji lanjut DMRT (Duncan Multiple Range Test)
denganَ tarafَ nyataَ α=5%. Hasil menunjukkan paparan medan
magnet ELF berpengaruh signifikan terhadap viabilitas benih tua
padi. Perlakuan M2 dan M3 menunjukkan hasil optimal pada
beberapa parameter, meliputi persentase kecambah normal
(98,00% dan 97,50%), waktu rata-rata perkecambahan (2,47 hari),
dan indeks perkecambahan (268,75). Medan magnet juga
meningkatkan panjang radikula (6,95 cm) dan plumula (4,82 cm).
Meskipun tidak berpengaruh signifikan terhadap rentang waktu
perkecambahan dan keserempakan tumbuh benih, nilai
2
keserempakan menunjukkan peningkatan (51,50-60,50%). Hasil ini
mengindikasikan potensi penggunaan medan magnet ELF untuk
meningkatkan viabilitas benih tua padi.
Kata kunci: membran sel, perkecambahan, vigor
ABSTRACT
The deterioration in rice seed (Oryza sativa L.) viability during
storage is a serious problem in rice cultivation caused by various
factors, including cell membrane damage and increased
production of reactive oxygen species (ROS). ELF (Extremely Low
Frequency) magnetic fields offer an environmentally friendly
solution to improve seed viability through mechanisms of cellular
response activation and membrane integrity repair. Magnetic
fields can induce changes in electron flow in cells, potentially
accelerating metabolic processes and enhancing plant growth.
This research aims to analyze the effects of ELF magnetic field
induction on aged rice seed (Oryza sativa L.) viability. This
research used a Completely Randomized Design with four
exposure time treatments: control (M0), 3 minutes 54 seconds
(M1), 7 minutes 48 seconds (M2), and 11 minutes 42 seconds (M3),
replicated four times, resulting in 16 experimental units. The
samples used were 8-month-old Inpari 32 HDB rice variety seeds,
with a total of 800 seeds. Data analysis used One Way ANOVA and
Duncan Multiple Range Test (DMRT) with a significance level of
α=5%. Results showed that ELF magnetic field exposure
significantly affected aged rice seed viability. Treatments M2 and
M3 showed optimal results in several parameters, including
normal germination percentage (98.00% and 97.50%), mean
germination time (2.47 days), and germination index (268.75). The
magnetic field also increased radicle length (6.95 cm) and plumule
length (4.82 cm). Although it did not significantly affect the
germination time range and seed growth uniformity, the uniformity
value showed improvement (51.50-60.50%). These results indicate
the potential use of ELF magnetic fields to improve aged rice seed
viability.
Keywords: cell membrane, germination, vigo
Construction of the Phylogenetic Tree from Genus of Carnivorous Plants Based on Internal Transcribed Spacer (ITS) Marker in Silico
Get PDFCarnivorous plants are plants that have morphological adaptations to prey on and digest small animals as an additional source of nutrition. There are several genera of carnivorous plants, namely Nepenthes, Drosera, Heliamphora, and Pinguicula. Among these genera, they have similar morphological and molecular characteristics and uniqueness. Molecular characterization needs to be carried out to analyze the genetic relationships between carnivorous plant species through the construction of phylogenetic trees. This study aims to obtain information on genetic relationships in several genera of carnivorous plants using an in silico phylogenetic tree based on Internal Transcribed Spacer (ITS) sequences. ITS sequences were collected from NCBI by searching for species names and then aligned using Clustal-W. Subsequently, the construction of the phylogenetic tree was performed using MEGA X with the Maximum Likelihood method and Bootstrap analysis of 1000. The results of the phylogenetic construction of several carnivorous plant genera are divided into two main clades. Clade I is divided into sub-clades: clade IA consists of species from the genera Heliamphora and Drosera with a bootstrap value of 76, while clade IB consists of species from the genus Pinguicula and one species from Nepenthes with a bootstrap value of 56. Clade II consists of species from the genus Nepenthes with a bootstrap value of 52. The results of this phylogenetic construction show the grouping of carnivorous plant species based on genetic similarity
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
Dispelling the Myths Behind First-author Citation Counts
Get PDFWe 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
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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