scholarly journals The Aoko (water-bloom of blue-green algae) of Lake Biwa in autumn of 1991

1992 ◽  
Vol 28 (2) ◽  
pp. 129-131
Author(s):  
Ken-ichiro Negoro
Keyword(s):  
Green Algae ◽  
Lake Biwa ◽  
Water Bloom ◽  
Blue Green Algae

The relationship between musty-odor-causing organisms and water quality in Lake Biwa

1995 ◽  
Vol 31 (11) ◽  
pp. 153-158 ◽  
Author(s):  
M. Kajino ◽  
K. Sakamoto
Keyword(s):  
Water Quality ◽  
Data Analysis ◽  
Green Algae ◽  
Analytical Methods ◽  
Lake Biwa ◽  
Blue Green Algae ◽  
Odor Compounds ◽  
Musty Odor ◽  
The Relationship

Musty odor has occurred annually in Lake Biwa since 1969. Osaka municipal waterworks, which is located downstream of Lake Biwa, has made many efforts to treat musty-odor compounds produced in Lake Biwa from spring through autumn. With the development of analytical methods for the determination of musty-odor compounds, we have been able to confirm that planktonic blue-green algae are the major causes of the musty-odor occurrences. The relationship between the growth of blue-green algae and the water quality was not so apparent. However, through our data analysis focusing on the relationship between musty-odor occurrences due to Phormidium tenue or Oscillatoria tenuis and some nutrients in Lake Biwa, we found that the concentration of nitrate in water may be an important parameter for the estimation of growth of the algae and the musty-odor behavior.

Vertical profile of algal distribution during aeration prior to intake tower for safe drinking water

2007 ◽  
Vol 55 (1-2) ◽  
pp. 321-327 ◽  
Author(s):  
H.K. Kim ◽  
J.M. Kim ◽  
Y.J. Lee ◽  
B.I. Kim ◽  
B.C. Lee ◽  
...  
Keyword(s):  
Drinking Water ◽  
Green Algae ◽  
Vertical Profile ◽  
Water Bloom ◽  
Safe Drinking Water ◽  
Blue Green Algae ◽  
Natural Toxins ◽  
Dam Site ◽  
The Vertical Distribution ◽  
Algal Distribution

Blue-green algae or cyanobacteria comprise a diverse group of organisms, all of which generate potent natural toxins, as well as characteristic odours. In particular, blue-green algae, such as Microcystis and Anabaena, are often detected abundantly in surface water used as a drinking water resource. In order to confirm our ability to provide safe drinking water even during a water bloom, we have conducted an investigation into the vertical distribution of algae during aeration prior to entry into the intake tower at a dam site. Our analysis of the vertical algal distribution during aeration indicated that aeration occurring at the intake tower exerts a significant influence on the safety of the drinking water. It was determined that the discontinuation of aeration and an increase in the depth at which water intake is conducted, constitutes a viable strategy for the maintenance of toxin- and odour-free drinking water, particularly during water bloom events.

Musty Odour Problems in Lake Biwa 1982-1987

1988 ◽  
Vol 20 (8-9) ◽  
pp. 133-142 ◽  
Author(s):  
Masakazu Yagi
Keyword(s):  
Green Algae ◽  
Lake Biwa ◽  
Early Summer ◽  
Research Groups ◽  
Blue Green Algae

This paper discusses the results obtained by two research groups investigating the musty odour problem in Lake Biwa during the years 1967 to 1987. The study has shown that the problem is caused by the growth of three species of planktonic blue-green algae in the southern lake. These algae produce as metabolites either 2-methyl-isoborneol (MIB) or geosmin and it is these compounds which give rise to the musty odour. Recently the musty odour problem has expanded from western to eastern part in the southern lake. The occurrence of the problem has also changed from spring to early summer and more recently it has begun to appear also during the autumn months. The maximum concentrations for geosmin and MIB, 1,050 and 860 ng/l, recorded for the lake occurred in the autumn of 1985.

Blue-Green Algae in Lake Biwa Which Produce Earthy-Musty Odors

1988 ◽  
Vol 20 (8-9) ◽  
pp. 117-123 ◽  
Author(s):  
T. Negoro ◽  
M. Ando ◽  
N. Ichikawa
Keyword(s):  
Water Supply ◽  
Green Algae ◽  
Lake Biwa ◽  
Supply System ◽  
Surrounding Water ◽  
Blue Green Algae ◽  
Kyoto City ◽  
Off Flavors ◽  
Musty Odor ◽  
Odorous Compounds

Since 1969, earthy-musty odor problems have frequently occurred in the water supply system of Kyoto City. Though the causes of these off-flavors were identified as 2-methylisoborneol (MIB) and geosmln, the causative organisms were not identified until recently. Now three species of planktonic blue-green algae from Lake Biwa have been identified as playing important roles in such problems. From the unlalgal culture of each alga, Anabaenamacrospora Klebahn was shown to produce geosmln, and both Phormidiumtenue (Meneghini) Gomont and Oscillatoriatenuis Agardh to produce MIB. These odorous compounds were found to be mainly stored in trlchomes, although it was once thought that they were dissolved in the surrounding water. Therefore, most of the odorous compounds can be removed from the water when the causative algae are removed.

scholarly journals Occurrence of Blue-green Algae and Algal Lytic Bacteria in Lake Biwa

1987 ◽  
Vol 2 (1) ◽  
pp. 21-28 ◽  
Author(s):  
ATSUSHI MITSUTANI ◽  
ARITSUNE UCHIDA ◽  
YUZABURO ISHIDA
Keyword(s):  
Green Algae ◽  
Lake Biwa ◽  
Blue Green Algae ◽  
Lytic Bacteria

Freeze-Fracture Replication in the Ultrastructure of Blue-Green Algae

1967 ◽  
Vol 25 ◽  
pp. 74-75
Author(s):  
L. V. Leak
Keyword(s):  
Cell Wall ◽  
Electron Microscope ◽  
Green Algae ◽  
Three Dimensional ◽  
Freeze Fracture ◽  
Electron Microscopic ◽  
Photosynthetic Membranes ◽  
Blue Green Algae ◽  
Cell Biol ◽  
Cellular Components

Electron microscopic observations of freeze-fracture replicas of Anabaena cells obtained by the procedures described by Bullivant and Ames (J. Cell Biol., 1966) indicate that the frozen cells are fractured in many different planes. This fracturing or cleaving along various planes allows one to gain a three dimensional relation of the cellular components as a result of such a manipulation. When replicas that are obtained by the freeze-fracture method are observed in the electron microscope, cross fractures of the cell wall and membranes that comprise the photosynthetic lamellae are apparent as demonstrated in Figures 1 & 2.A large portion of the Anabaena cell is composed of undulating layers of cytoplasm that are bounded by unit membranes that comprise the photosynthetic membranes. The adjoining layers of cytoplasm are closely apposed to each other to form the photosynthetic lamellae. Occassionally the adjacent layers of cytoplasm are separated by an interspace that may vary in widths of up to several 100 mu to form intralamellar vesicles.

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