scholarly journals THE RECLAMATION OF “SHINDEN” IN THE FLOOD PLAINS OF THE RIVER OMONO AND BABAME IN AKITA PREFECTURE, NORTHERN JAPAN

1964 ◽  
Vol 37 (1) ◽  
pp. 35-44
Author(s):  
Tetsuo MIURA
Keyword(s):  
Flood Plains ◽  
Akita Prefecture ◽  
Northern Japan

scholarly journals Widespread Occurrence of Pythium arrhenomanes Pathogenic to Rice Seedlings Around Japanese Rice Fields

Plant Disease ◽  
2015 ◽  
Vol 99 (12) ◽  
pp. 1823-1831 ◽  
Author(s):  
Takeshi Toda ◽  
Akinori Iwasa ◽  
Shinichi Fuji ◽  
Hiromitsu Furuya
Keyword(s):  
Rice Seedling ◽  
Rice Fields ◽  
Rice Seedlings ◽  
Specific Primers ◽  
Widespread Occurrence ◽  
Pythium Arrhenomanes ◽  
Akita Prefecture ◽  
Polymerase Chain ◽  
Species Specific ◽  
Northern Japan

In Japan, rice seedlings grown in nurseries and used for transplanting are subject to a damping-off disease caused by Pythium spp. In this study, 148 isolates of Pythium spp. were obtained from rice seedlings in 39 locations of northern Japan. Among the isolates, 137 were identified as Pythium arrhenomanes using polymerase chain reaction (PCR) with species-specific primers, DNA sequencing analyses of the internal transcribed regions of ribosomal DNA, and the morphologies of oogonia, antheridia, oospores, and zoosporangia. Inoculation tests showed that the isolates identified as P. arrhenomanes were pathogenic to rice seedlings and parasitic to southern crabgrass with only minor damage. P. arrhenomanes was reisolated from the roots of both rice seedlings and southern crabgrass. Poaceae weeds, hosts of Pythium spp., grow in and around nurseries and in ridges surrounding rice fields. To detect Pythium spp., 188 Poaceae weeds were collected from 37 locations in Akita Prefecture. P. arrhenomanes was frequently detected in 164 weed roots from all locations by PCR using species-specific primers. Thus, we determined that P. arrhenomanes exists in and around rice seedling nurseries and rice fields, and that it is much more widely distributed than previously recognized in northern Japan.

Prevalence of dystonia in Akita prefecture in Northern Japan

2006 ◽  
Vol 21 (7) ◽  
pp. 1047-1049 ◽  
Author(s):  
Masashiro Sugawara ◽  
Sumio Watanabe ◽  
Itaru Toyoshima
Keyword(s):  
Akita Prefecture ◽  
Northern Japan

ESTIMATION OF THE ABUNDANCE AND DISTRIBUTION OF RARE EARTH ELEMENTS IN SOIL AROUND KADUNA REFINING AND PETROCHEMICAL COMPANY USING NUCLEAR TECHNIQUE

2020 ◽  
Vol 4 (2) ◽  
pp. 599-604
Author(s):  
Michael A. Onoja ◽  
P. H. Bukar ◽  
C. U. Omeje ◽  
A. M. Adamu
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Nuclear Technique ◽  
Flood Plains ◽  
Economic Exploitation ◽  
Rare Elements ◽  
Petrochemical Company ◽  
The Moment ◽  
Abundance And Distribution ◽  
Natural Pattern

Instrumental neutron activation analysis (INAA) technique was used to investigate the abundance and distribution of rare earth elements (REE) in soil around Kaduna Refinery. The aim of the study is to assess the rare elements potential of Nigeria for economic exploitation. Five REEs (La, Dy, Eu, Yb, and Lu) were detected in varying concentrations ranging from a minimum of 0.6 µg/g (Lu) to a maximum of 249.0 µg/g (La). The elements existed with trends consistent with the natural pattern of REEs in soil, showing significant Eu and Dy anomalies which characterize upper plains and flood plains. The levels of REEs in soil in the study area were generally slightly above background levels, with minimal (La, Dy, and Eu), moderate (Yb), and significant (Lu) enrichments and trending: Lu ˃Yb ˃ Eu ˃ Dy ˃ La. The abundance of the REEs investigated cannot establish a potential of Nigeria for economic exploitation of the mineral, hence, rare earth project in the study area is not viable at the moment.

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