Seiche Observations in Lake Koyama, Tottori Prefecture

Seiche observations were conducted on 20th April, 1996 at 6 sites (site AーF) on shore of Lake Koyama, Tottori Prefecture. This brackish lake has 7.0km area and 14.4km shore line length. Strong wind (more than 10m/s in 10min. average) blew just two days before the observational day. Water level fluctuations illustrate anti-phase between observational sits A & B on northern shore and D & E on southern shore, which means typical Seiches. Water level fluctuations occurred at c.a. 17 min. intervals, which can be estimated by T=2 L/√(gh) Where T : wave period(s), L : diameter of a lake(m), g : acceleration due to gravity(9.8m/s^2) and h : mean water depth of a lake(m). Fluctuation range varied from 4cm to 10cm from site to site

Effect of abrasion on downstream gravel-size reduction in the Watarase river, Japan : field work and laboratory experiment

Two processes have been considered to explain downstream grainsize reduction in gravel-bed rivers. One is sorting which results in finer grains being transported downstream faster and further than the larger ones. ...Thesis (Ph.D. in Science)--University of Tsukuba, (B), no. 714, 1991.10.3

トットリケン イワミチョウ ノ サンイン カイガン カイヒン ニ オケル ウスバカゲロウ ルイ ノ ブンプ

鳥取県岩美町の7つの砂浜と鳥取砂丘東端の海岸砂丘でウスバカゲロウ幼虫（アリジゴク）の分布を調査した。鳥取砂丘でみられる 種（ハマベウスガカゲロウ，クロコウスバカゲロウ，オオウスバカゲロウ，コカスリウスバカゲロウ）のうち，岩美町ではハマベウスガカゲロウをのぞく3種が出現した。小礫～中礫の礫浜または極粗砂の砂浜である鴨ヶ磯と城原海岸ではいずれの種も確認できなかった。鳥取砂丘と岩美町内の海浜の間に砂浜の粒径には大きな差はなく，岩美町内の砂浜でハマベウスバカゲロウがみられない理由は粒径では説明できない。ハマベウスバカゲロウの既知生息地との比較から，海浜の規模が小さいことと，砂丘の形成が弱いことがハマベウスバカゲロウを欠く理由と推測された。 We surveyed distribution of antlions (larvae of Myrmeleontidae) in 14 sites from 7 sandy beaches in Iwami-cho, easternmost town of Tottori Prefecture and Tottori Sand Dunes. Of the four species (Myrmeleon solers, M. bore, Heoclisis japonica, Distoleon contubernalis) known from Tottori Sand Dunes, three species excluding a pit-building species M. solers were found to occur in the Iwami-cho. No species were found in Kamogaiso Beach and Shirawara Beach that are pebble to cobble or very coarse sandy beaches. Absence of M. solers in beaches in Iwami-cho cannot be explained by sand grain size because there were no significant differences between Tottori Sand Dunes and beaches in Iwami-cho. Comparison with beaches where occurrence of M. solers has been reported and beaches in Iwami-cho suggested shorter coast lines and lower development of sand dunes behind beaches in Iwami-cho may explain the absence of the species in Iwami-cho

Kaempulchraols IO: new isopimarane diterpenoids from Kaempferia pulchra rhizomes collected in Myanmar and their antiproliferative activity

The isolation of the CHCl3 soluble extract of Kaempferia pulchra rhizomes afforded seven new isopimarane diterpenoids, kaempulchraols I−O, together with one known analogue. The structures of these compounds were elucidated using 1D and 2D NMR and X-ray diffraction analyses. The antiproliferative activity of the isolated compounds was evaluated against a panel of five human cancer cell lines. Kaempulchraol L exhibited weak antiproliferative activity against PANC-1 and PSN-1 cells with IC50 values of 39.9 and 22.6 μM, respectively

Kaempulchraols PT: diterpenoids from the Kaempferia pulchra rhizomes collected in Myanmar

The isolation of the oily fraction obtained from the CHCl3-soluble extract of the rhizomes of Kaempferia pulchra (Zingiberaceae) afforded five new isopimarane diterpenoids, kaempulchraols P−T (1−5), along with two known analogues. The structures were elucidated using spectroscopic techniques, including 2D NMR spectroscopy