scholarly journals A fossil aphid gall from the middle Pleistocene sediment in Hyogo Prefecture, western Japan

2019 ◽  
Vol 22 (3) ◽  
pp. 270-274
Author(s):  
Minoru Tsukagoshi ◽  
Ken Sawada ◽  
Shin‐ichi Akimoto
Keyword(s):  
Middle Pleistocene ◽  
Western Japan ◽  
Hyogo Prefecture ◽  
Pleistocene Sediment

LAS in urban rivers and factors contributing to reduction of their concentrations

2004 ◽  
Vol 50 (5) ◽  
pp. 355-361 ◽  
Author(s):  
Y. Kobuke
Keyword(s):  
Diffusion Rate ◽  
Anionic Surfactants ◽  
Concentration Level ◽  
Urban Rivers ◽  
River Waters ◽  
The Past ◽  
Western Japan ◽  
Hyogo Prefecture ◽  
Major Factors ◽  
Concentration Levels

LC/MS analysis with improved SPE preparation was applied to determine trace amounts of LAS in river waters. By using this procedure, the distribution of LAS was investigated and compared with the previous concentration level measured by HPLC in the Akashi River flowing through urbanized coastal areas in Hyogo Prefecture, western Japan. Detected LAS were in the range of 0.6-11 μg/L and considerably lower than those in 1985. This indicated that LAS concentration levels reduced to 1/10 and below during the past 18 years. From the model analysis, major factors contributing to the reduction of their concentrations were estimated to be the sewerage development and the decrease of consumption of anionic surfactants. Statistical analysis of MBAS monitoring data suggested that over 90% of sewerage diffusion rate was needed in order to reduce LAS to the concentration level of the order of 10 μg/L in river waters.

Microhabitat distribution and behaviour of Branchiobdellidan Holtodrilus truncatus found on the freshwater shrimp Neocaridina spp. from the Sugo River, Japan

2014 ◽  
Vol 9 (1) ◽  
pp. 80-85
Author(s):  
Nobuaki Niwa ◽  
Miguel Archdale ◽  
Takashi Matsuoka ◽  
Aina Kawamoto ◽  
Haruka Nishiyama
Keyword(s):  
River Water ◽  
Lake Biwa ◽  
Symbiotic Relationship ◽  
Freshwater Shrimp ◽  
Macrobrachium Nipponense ◽  
Shrimp Species ◽  
Microhabitat Distribution ◽  
Western Japan ◽  
Hyogo Prefecture

AbstractA study was performed on the microhabitat distribution and some aspects of behaviour of the ectosymbiotic branchiobdellidan Holtodrilus truncatus (Annelida, Clitellata) found on the freshwater shrimp that inhabit the Sugo River, Hyogo Prefecture, western Japan. Observations on shrimp that were collected from the Sugo River (2003 to 2011) confirmed that the host shrimp is Neocaridina spp. (Atyidae). The attachment location on the host shrimp was predominately between the 1st pleopod and the 5th pereopod (55.3%). The reproductive method of H. truncatus is hemaphroditism. The cocoon was found only inside the carapace of the host shrimp. The cocoon was transparent and contained a maximum of 14 juvenile worms (developing embryos). When hatching approached, H. truncatus’s worms became elongated and slender, and only one worm hatched out at a time. When Holtodrilus truncatus was removed from its host and was maintained in river water without any food, it survived for a maximum of 46 days. In a host exchange experiment, where we provided several other freshwater shrimp species, Palaemonidae fed on H. truncatus. Moreover, Palaemon paucidens and Macrobrachium nipponense from Lake Biwa also preyed upon H. truncatus. The possible symbiotic relationship between H. truncatus and Neocaridina spp. (family Atyidae) is further discussed.

scholarly journals The Great Hanshin Earthquake and Fire

2007 ◽  
Vol 2 (4) ◽  
pp. 298-302 ◽  
Author(s):  
Yoshiteru Murosaki ◽  
Keyword(s):  
Richter Scale ◽  
The Future ◽  
Western Japan ◽  
Urban Fires ◽  
Hyogo Prefecture ◽  
Collapsed Buildings ◽  
Hanshin Earthquake

Hyogo Prefecture in western Japan was hit on January 17, 1995, by an epicentral earthquake measuring 7.2 on the Richter scale. The Great Hanshin Earthquake left over 6,000 people dead beneath collapsed buildings and in urban fires. We discuss the damage and nature and causes of fires to provide information that may help prevent such events in the future.

scholarly journals Potential and limits of OSL, TT-OSL, IRSL and pIRIR<sub>290</sub> dating methods applied on a Middle Pleistocene sediment record of Lake El'gygytgyn, Russia

2013 ◽  
Vol 9 (2) ◽  
pp. 719-733 ◽  
Author(s):  
A. Zander ◽  
A. Hilgers
Keyword(s):  
Dose Response ◽  
Sediment Cores ◽  
Luminescence Dating ◽  
Middle Pleistocene ◽  
Response Curves ◽  
Proxy Data ◽  
Lake El’Gygytgyn ◽  
Age Model ◽  
Dose Response Curves ◽  
Pleistocene Sediment

Abstract. This study tests the paleomagnetic and proxy-data based Mid- to Upper Pleistocene sediment deposition history of Lake El'gygytgyn by applying different approaches of luminescence dating techniques on sediment cores taken from the centre of the 175 m deep lake. For dating polymineral and quartz fine grains (4–11 μm grain size range) were extracted from nine different levels from the upper 28 m of sediment cores 5011-1A and 5011-1B. According to the independent age model, the lowest sample from 27.8–27.9 m below lake bottom level correlates to the Brunhes-Matuyama (B/M) reversal. Polymineral sub-samples were analysed by infra-red stimulated luminescence (IRSL) and post-IR IRSL measured at 290 °C (pIRIR290) using single aliquot regenerative dose (SAR) sequences. SAR protocols were further applied to measure the blue light optically stimulated luminescence (OSL) and thermally-transferred OSL (TT-OSL) of fine-grained quartz supplemented by a multiple aliquot approach. Neither low temperature IRSL measurements at 50 °C nor any OSL dating approach on quartz yielded reliable results. Deconvolution of their dose response curves revealed a pseudo-increase of the dose response curves and explains the observed underestimation. The pIRIR protocol applied to polymineral fine grains was the only luminescence technique able to provide dating results of acceptable accuracy up to ca. 700 ka when correlated to the existing proxy-data and paleomagnetic based age record. We present the potential and limits of the different dating techniques and a correlation of pIRIR290 results with the proxy-data based age model.

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