scholarly journals Metode Pengukuran Aliran Air Tanah di Lahan Gambut

JURNAL TEKNIK ◽  
2020 ◽  
Vol 14 (2) ◽  
pp. 163-169
Author(s):  
Muhammad Agung Pribadi ◽  
Sigit Sutikno ◽  
Koichi Yamamoto
Keyword(s):  

Provinsi Riau yang memiliki lahan gambut lebih dari 60% dari total lahan gambut yang terdapat di Pulau Sumatera. Di Provinsi Riau, Kabupaten Bengkalis salah satu wilayah yang penyebaran lahan yang terluas kedua setelah kabupaten Indragiri. Kabupaten Bengkalis yang terdiri dari wilayah daratan dan pulau, yang mana wilayah pulau tersebut memiliki lahan gambut lebih dari 80% dari total keseluruhan luas pulau. Pulau bengkalis telah mengalami fenomena – fenomena yang terjadi seperti abrasi, subsidensi, dan kebakaran lahan. Abrasi yang terjadi di Pulau Bengkalis bagian Barat Laut telah berlangsung lebih dari 30 tahun terakhir membuat penelitian ini bagaimana situasi hidrologis yang terjadi akibat fenomena abrasi ini. Penelitian ini bertujuan untuk mengetahui bagaimana aliran air tanah di pinggir pantai abrasi dengan menggunakan alat PDV (Paper Disk Velocimeter). Alat PDV ini merupakan pengukuran kecepatan aliran air tanah yang dikembangkan di Universitas Yamaguchi, Jepang. Alat ini sangat sederhana dan ekonomis jika dibandingkan alat lain yang cenderung rumit dan mahal.

2015 ◽  
Vol 3 (2) ◽  
pp. 17 ◽  
Author(s):  
Mahsa Geransayeh ◽  
Sadegh Sepahvand ◽  
Vahid Abdossi

Strawberries are an extremely perishable fruit mainly due to their soft texture and sensitivity to fungal infection. Postharvest application of conventional fungicides to fruits is prohibited. As an alternative to fungicides, salicylic acid has been found to enhance disease resistance of horticultural crops. In order to study the effect of salicylic acid as a phenolic compound on the postharvest durability and quality characteristics of strawberry fruit. ‘Gaviota’ strawberries were treated with SA at different concentrations (0, 25, 50 and 100 µlL-1), then stored for 12 days at 4 ˚C and 75 % RH in darkness. Two different methods were applied (spray SA on fruits and paper disk method). Quality attributes such as weight loss, pH, TA, TSS, vitamin C, anthocyanin, calcium, pectin, CAT, POD, PG activity, decay percentage and sensory analyses evaluated every 3 days during storage. Results showed that, treated fruits with SA had lower weight loss, pH, TSS, POD, PG, decay and higher TA, vitamin C, anthocyanin, calcium, pectin, CAT and fruit quality compared with controls. Between two methods of treatment, paper disk method had higher effect on fruit decay and quality compared to spray method and as a general result, caused longer storability.


2017 ◽  
Vol 32 (3) ◽  
pp. e12266 ◽  
Author(s):  
Niamh M. Murray ◽  
Dolores O'Riordan ◽  
Jean-Christophe Jacquier ◽  
Michael O'Sullivan ◽  
Joshua L. Cohen ◽  
...  

2002 ◽  
Vol 3 (2) ◽  
Author(s):  
M. M. CUNICO ◽  
O. G. MIGUEL

A Ottonia martiana Miq., arbusto da família Piperaceae, é conhecida na medicina popular brasileira como “Anestésica”. Partes desta planta são utilizadas em alcoolaturas para aliviar dor de dente, devido à sua ação anestésica sobre a mucosa bucal. Estudo fitoquímico realizado com extrato das raízes desta planta indicou a presença de duas isobutilamidas: Isopiperlonguminina e Piperovatina, as quais foramidentificadas por Espectroscopia de RMN de 1H e 13C. Análises por CG-MS nos extratos dos frutos desta espécie em estudo, revelaram a presença de dois isômeros, um do composto estigmasterol e outro do b-sitosterol. No estudo das atividades antimicrobianas, extratos brutos etanólicos das raízes e caules (50 e 100%) desta planta, apresentaram efeito antibacteriano sobre S. aureus, quando testados pelo método por difusão em gel. Também, foi verificado que extratos desta espécie apresentaramatividade antifúngica (crescimentomicelial) sobre Fusariumoxysporum, Colletotrichum acutatum e Rhizoctonia sp., dependente da concentração, do método de extração e do órgão utilizado. Os resultados confirmaram a presença de princípios ativos, os quais poderão vir a ser empregados na terapêutica, inclusive com potencial para controle de microrganismos fitopatogênicos. STUDY PHYTOCHEMICAL AND OF ANTIMICROBIAL ACTIVITY FROM Ottonia martiana Miq., PIPERACEAE Abstract Ottonia martiana Miq., a shrub from the family Piperaceae, is known in Brazilian folk medicine as “Anestésica”. Its parts are used in alcoholic macerates to relieve toothache, due to its anesthetic action on mucous membrane. Phytochemical investigation performed with extract of O. martiana roots indicated the presence of two isobutylamides: Isopiperlonguminine and Piperovatine, which were identified by spectroscopy NMR (1H and 13C). In analysis of the extracts of fruits by GC-MS, isomers of stigmasterol and b-sitosterol are present. In the studies of antimicrobial activity, ethanolic crude extracts of the roots and stems (50 and 100%) from this plant showed antibacterial effects against S. aureus, by paper disk-diffusion method. Also, it was observed that extracts of this species exhibit antifungical activity (mycelial growth) against Fusarium oxysporum, Colletotrichum acutatum and Rhizoctonia sp, dependent on the extract concentration, extraction method and employed organ. The results confirmed the presence of active substances, which could be employed in therapeutics, and with potential to control phytopathogenic microorganisms.


Science ◽  
1951 ◽  
Vol 113 (2924) ◽  
pp. 35-36 ◽  
Author(s):  
L. Zechmeister
Keyword(s):  

1979 ◽  
Vol 62 (5) ◽  
pp. 985-988
Author(s):  
Larry A Ouderkirk

Abstract A collaborative study was performed on a Bacillus stearothermophilus paper disk method designed to detect residual levels of 4 antibiotic drugs in whole market milk. This method is a modification of an earlier procedure developed for the International Dairy Federation. Whole milk samples spiked at low levels with ampicillin, cephapirin, cloxacillin, and penicillin G were sent frozen to 11 collaborating laboratories with instructions to assay them promptly according to the method provided. Five of the laboratories reported inconclusive results due to technical difficulties encountered with the method. The 6 remaining laboratories all detected levels of 0.005- 0.008 μg or unit/mL for penicillin G, ampicillin, and cephapirin and 0.05-0.08 μg/mL for cloxacillin. The most commonly used official methods, the Sarcina lutea (Micrococcus luteus) cylinder plate method and the Bacillus subtilis paper disk method, can detect levels of 0.01 and 0.05 unit penicillin G/mL, respectively. The B. stearothermophilus method is rapid, simple to perform, and more sensitive than present official methods. The method has been adopted as official first action for the detection of penicillins in milk.


1983 ◽  
Vol 103 (5) ◽  
pp. 793-796 ◽  
Author(s):  
Masao Sakaguchi ◽  
Shigeyoshi Suzuki ◽  
Kanji Nagashima ◽  
Satoshi Shimano ◽  
Satoshi Uchida ◽  
...  

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