Three-dimensional fluorescence as a tool for investigating the dynamics of dissolved organic matter in the Lake Biwa watershed

Limnology ◽  
2005 ◽  
Vol 6 (2) ◽  
pp. 101-115 ◽  
Author(s):  
Khan M. G. Mostofa ◽  
Takahito Yoshioka ◽  
Eiichi Konohira ◽  
Eiichiro Tanoue ◽  
Kazuhide Hayakawa ◽  
...  
Keyword(s):  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Lake Biwa ◽  
Three Dimensional

Seasonal and spatial variations in characteristics of Lake Biwa dissolved organic matter: sorption of pyrene and its derivatives and fluorescence properties

2008 ◽  
Vol 58 (8) ◽  
pp. 1609-1614
Author(s):  
T. Kusakabe ◽  
K. Ikeda ◽  
Y. Shimizu ◽  
S. Higashi ◽  
Y. Kawabata ◽  
...  
Keyword(s):  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Lake Biwa ◽  
Vertical Mixing ◽  
Three Dimensional ◽  
Spatial Variations ◽  
Fluorescence Properties ◽  
Sorption Coefficient ◽  
Suwannee River Fulvic Acid ◽  
Seasonal And Spatial Variations

The objectives of this research were to investigate seasonal and spatial variations in (1) sorption of pyrene and its derivatives onto dissolved organic matter (DOM) and (2) fluorescence properties of DOM in Lake Biwa, Japan. In the case of pyrene, sorption coefficient (Kdoc) of Lake Biwa DOM seasonally changed from 1,200 to 3,800 L/kgC. Vertical distribution of Kdoc was affected by thermocline formation in summer, while it was uniformly distributed as a result of vertical mixing in winter. Functional groups affected sorption of pyrene onto Lake Biwa DOM in different manner from that onto Suwannee River fulvic acid. Three-dimensional excitation emission matrices (3D-EEMs) fluorescence spectroscopy was applied to characterize Lake Biwa DOMs and indicated the existence of at least two fluorophores. The two major peaks at Ex230/Em300 and Ex230/Em425 originated from protein-like and fulvic/humic-like substances, respectively. The peak at Ex230/Em300 showed the maximum fluorescence intensity at a depth of 5 m and could be affected by stratification of the water column in summer. On the other hand, the peak at Ex230/Em425 showed similar profiles both in summer and in winter. These results demonstrably showed that sorption of micropollutants and fluorescence properties of Lake Biwa DOMs were seasonally and spatially varied.

scholarly journals Biodegradation of Dissolved Organic Matter (DOM) Released from Phytoplankton in Lake Biwa

2012 ◽  
Vol 28 (7) ◽  
pp. 675-681 ◽  
Author(s):  
Etsu YAMADA ◽  
Shinya OHARA ◽  
Takashi UEHARA ◽  
Takaaki HIROTA ◽  
Naoko HATORI ◽  
...  
Keyword(s):  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Lake Biwa

Distribution and characteristics of ultraviolet absorption and fluorescenceof dissolved organic matter in a large lake (Lake Biwa, Japan)

2016 ◽  
Vol 42 (3) ◽  
pp. 571-579 ◽  
Author(s):  
Kazuhide Hayakawa ◽  
Reiji Kojima ◽  
Chizuru Wada ◽  
Tomoyo Suzuki ◽  
Yuko Sugiyama ◽  
...  
Keyword(s):  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Lake Biwa ◽  
Ultraviolet Absorption ◽  
Large Lake

scholarly journals Characterization of Dissolved Organic Matter in Deep Geothermal Water from Different Burial Depths Based on Three-Dimensional Fluorescence Spectra

Water ◽  
2017 ◽  
Vol 9 (4) ◽  
pp. 266 ◽  
Author(s):  
Weifang Qiao ◽  
Xinyi Wang ◽  
Xiaoman Liu ◽  
Xiaoge Zhen ◽  
Jianwei Guo ◽  
...  
Keyword(s):  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Fluorescence Spectra ◽  
Three Dimensional ◽  
Geothermal Water

scholarly journals Behavior of Humic Substances and Algal Dissolved Organic Matter as Precursors of Trihalomethane in Lake Biwa

2009 ◽  
Vol 58 (4) ◽  
pp. 231-240 ◽  
Author(s):  
Shinya Ohara ◽  
Takashi Uehara ◽  
Keiichiro Kimura ◽  
Tetsuro Yoshida ◽  
Shohei Fujiwara ◽  
...  
Keyword(s):  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Humic Substances ◽  
Lake Biwa

scholarly journals Process optimization of β-glucosidase production by a mutant strain, Aspergillus niger C112

BioResources ◽  
2017 ◽  
Vol 12 (4) ◽  
pp. 8937-8952
Author(s):  
Peng Zhan ◽  
Jingjing Sun ◽  
Fang Wang ◽  
Lin Zhang ◽  
Jienan Chen
Keyword(s):  
Organic Matter ◽  
Aspergillus Niger ◽  
Dissolved Organic Matter ◽  
Mutant Strain ◽  
Process Optimization ◽  
Culture Medium ◽  
Three Dimensional ◽  
Enzymatic Saccharification ◽  
Cost Effective ◽  
Chemical Parameters

Enzymatic saccharification is a key step in the green conversion of lignocellulose to biofuels and other products. A key deficiency in common biocatalytic systems, such as Trichoderma reesei, is the insufficient presence of β-glucosidase (BGL). This study intended to develop an efficient process of BGL production as an enhancement to the T. reesei system. The authors investigated the process optimization of BGL by the mutant strain Aspergillus niger C112, which was previously developed in the authors’ laboratory. The culture medium and process (carbon, nitrogen, temperature, and pH) were optimized for cost-effective BGL production, which led to a maximum BGL activity of 8.91 ± 0.35 U/mL. In addition, the dynamics of the physio-chemical parameters (zeta potential and dissolved organic matter) of the process were studied and showed good correlations to the yield of BGL. Furthermore, a three-dimensional excitation-emission matrix fluorescence spectroscopy was successfully applied for analyzing the component, origin, and dynamics of dissolved organic matter, which contributed to a further understanding and optimization of BGL production.

scholarly journals Fractionation of Dissolved Organic Matter (DOM) as Precursors of Trihalomethane in Lake Biwa and Yodo Rivers

2005 ◽  
Vol 54 (9) ◽  
pp. 923-928 ◽  
Author(s):  
Kenichi NAGAI ◽  
Sinichi AOKI ◽  
Yasuro FUSE ◽  
Etsu YAMADA
Keyword(s):  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Lake Biwa
Sign in / Sign up

Export Citation Format

Share Document