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2021 ◽  
Author(s):  
Milanka Radulovic ◽  
◽  
Svetlana Mitrovski

Peat is a natural substrate for growth of microorganisms because it is rich in compounds that microorganisms can use as sources of carbon, nitrogen and growth factors. Peat originating from Vlasina lake in Eastern Serbia is especially rich in organic matter. The content of humic substances (humic acid, fulvic acid and humine) is almost twice that found in other peat-rich regions of similar origin and geochemical age. Humic and fluvic acids are known to promote microbial growth. In this work, humic and fulvic acids were first extracted from Vlasina lake peat and then added to minimal medium (synthetic, low ionic strength medium). The humic substances were added separately and combined in a 1:1 ratio by mass to study their individual and combined effect on microbial growth of Escherichia coli ATCC 25922 (Gr–), Staphyloccocus aureus (Gr+) i Aureobasidium pullulans, strain CH-1. The microbial growth was measured microspectrophotometrically over a 24-hour period and growth curves were obtained for a range of acid concentrations between 25 µg cm-3 and 100 µg cm-3. It was found that both humic and fulvic acids promote the growth of all three microorganisms by up to a maximum of 40%-80% the extent of which varied with the concentration of the acid and the identity of the microorganism. In general, humic acid was found to result in higher microbial growth (at highest concentrations, up to ~80% for all three microbial species).


Author(s):  
Xiao‐Fei Wang ◽  
Xin‐Gang Wang ◽  
Qing‐Qing Yang ◽  
Hong‐Liang Dong ◽  
Cheng Zhang ◽  
...  

2020 ◽  
Vol 11 (6) ◽  
pp. 1447-1461
Author(s):  
A. A. Lavrentiev ◽  
S. A. Golosienko ◽  
A. V. Ilyin ◽  
M. S. Mikhailov ◽  
G. D. Motovilina ◽  
...  

2020 ◽  
Vol 167 ◽  
pp. 110531
Author(s):  
Frank Tioguem ◽  
Franck N'guyen ◽  
Matthieu Mazière ◽  
Franck Tankoua ◽  
André Galtier ◽  
...  

2020 ◽  
Vol 32 (1) ◽  
pp. 1-10
Author(s):  
Priyambodo Priyambodo

Abstrak Angkutan penyeberangan di Dermaga Ngunut Kabupaten Tulungagung sangat dibutuhkan oleh masyarakat sekitarnya karena dapat membantu mobilitas mereka sehari-hari. Tujuan dari penelitian ini adalah untuk mengevaluasi dan mengembangkan angkutan penyeberangan di Dermaga Ngunut. Dengan menggunakan analisis deskriptif kualitatif dan analisis SWOT, penelitian ini menunjukkan bahwa angkutan penyeberangan di Dermaga Ngunut berada pada posisi kuat (strong) dan menengah (medium). Angkutan penyeberangan di daerah tersebut memiliki peluang yang tinggi serta kekuatan yang cukup (medium) untuk ditumbuhkan dan dikembangkan walaupun  memiliki kelemahan. Salah satu kelemahannya ialah Pemerintah Kabupaten Tulungagung memiliki keterbatasan wewenang dalam pembinaan dan pengelolaan angkutan penyeberangan. Dengan demikian, strategi yang dapat diterapkan adalah mengubah kelemahan menjadi kekuatan dengan cara memberikan kewenangan yang lebih besar kepada Pemerintah Kabupaten Tulungagung untuk mengelola angkutan penyeberangan di daerahnya. Aspek sarana yang perlu diperhatikan ialah pembuatan perahu yang belum mengikutsertakan pendamping atau teknisi dari industri galangan kapal. Adapun, aspek prasarana yang perlu diperhatikan ialah pembangunan dermaga yang belum sepenuhnya mengikuti proses dan prosedur dari instansi yang berwenang. Kata kunci: Angkutan penyeberangan, sarana prasarana, kelaikan berlayar, SWOT, strategi AbstractEvaluation and Development of Ferry Services at Ngunut Dock, Tulungagung Regency: Communities around Ngunut Dock, Tulungagung Regency, require ferry services to help their daily mobility. This research was designed to evaluate and develop ferry services at this dock by qualitative descriptive analysis and SWOT analysis. The results showed that the ferry services observed were in the strong and medium cells and had a great or excellent opportunity and a decent strength (medium) to grow and develop mainly because the community needed these services. This research, however, identified a weakness, i.e., the government of Tulungagung Regency had little to no authority to build and manage the ferry services. For these reasons, the strategy adopted must factor in improvements that change the weakness into a strength by giving the local government greater authority in the management. Future facility and infrastructure development must consider the fact that the ferry boat was made without technical assistance from the ship or boat industry and that the dock construction did not entirely follow the processes and procedures recommended by relevant authorities.  Keywords: Ferry services, infrastructure, seaworthiness, SWOT, strategy 


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