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장광현,Hideyuki Doi,Yuichiro Nishibe,남귀숙,Shin-ichi Nakano 한국생태학회 2014 Journal of Ecology and Environment Vol.37 No.4
Feeding behavior of Temora turbinata was investigated through laboratory experiments with special emphasis on its foodpreference and consequent clearance rate on diatom and microbial components given as common natural food assemblageof coastal area (Uchiumi, Uwa Sea, Japan). Among available prey items, T. turbinata showed the highest clearancerate for Thalassiosira spp. (0.23 ± 0.08 L Temora-1 day-1) followed by Chaetoceros spp. (0.11 ± 0.03 L Temora-1 day-1), butclearance rates for other diatom, Nitzschia spp. was lower (0.03 to 0.07 L Temora-1 day-1). Bacterial abundances showed noresponse against 24-h feeding of T. turbinata. Feeding of T. turbinata on heterotrophic nanoflagellates (HNF) was apparentwhen clearance rates of T. turbinata on diatoms were relatively low, but T. turbinata did not consume HNF as well asciliates with Thalassiosira spp. of which clearance rate was highest. The results suggest that HNF and ciliates are possiblesupplementary prey item for T. turbinata, but their contribution as food sources can be limited by the presence of otherprey items such as preferable diatom species.
Chang, Kwang-Hyeon,Doi, Hideyuki,Nishibe, Yuichiro,Nam, Gui-Sook,Nakano, Shin-Ichi The Ecological Society of Korea 2014 Journal of Ecology and Environment Vol.37 No.4
Feeding behavior of Temora turbinata was investigated through laboratory experiments with special emphasis on its food preference and consequent clearance rate on diatom and microbial components given as common natural food assemblage of coastal area (Uchiumi, Uwa Sea, Japan). Among available prey items, T. turbinata showed the highest clearance rate for Thalassiosira spp. ($0.23{\pm}0.08L\;Temora^{-1}day^{-1}$) followed by Chaetoceros spp. ($0.11{\pm}0.03L\;Temora^{-1}day^{-1}$), but clearance rates for other diatom, Nitzschia spp. was lower (0.03 to $0.07L\;Temora^{-1}day^{-1}$). Bacterial abundances showed no response against 24-h feeding of T. turbinata. Feeding of T. turbinata on heterotrophic nanoflagellates (HNF) was apparent when clearance rates of T. turbinata on diatoms were relatively low, but T. turbinata did not consume HNF as well as ciliates with Thalassiosira spp. of which clearance rate was highest. The results suggest that HNF and ciliates are possible supplementary prey item for T. turbinata, but their contribution as food sources can be limited by the presence of other prey items such as preferable diatom species.
Kikuchi, Eisuke,Takagi, Shigeto,Shikano, Shuichi,Hideyuki, Doi The Korean Society of Limnology 2005 생태와 환경 Vol.38 No.S
Carbon stable isotope ratios of producers varied in lake ecosystems. In tile present study, we tried to estimate the seasonal variations of carbon isotope ratios of phytoplankton and benthic diatoms in a strongly acidic lake ecosystem. Lake Katanuma is a volcanic, strongly acidic lake (average pH of 2.2), located in Miyagi, Japan. Only two algal species dominate in Lake Katanuma; Pinnularia acidojaponica as a benthic diatom, and Chlamydomonas acidophila as a green alga. Carbon isotope values of P. acidojaponica varied seasonally, while those of particulate organic matter, which were mainly composed of C. acidophila remained fairly stable. The differences suggested that $CO_2$ gas was more frequently limited for P. acidojaponica than C. acidophila, since high density patches of benthic diatoms were sometimes observed on the lake sediment. Generally, carbon concentration mechanisms (CCMs)of microalgae can fix bicarbonate in lakes, and affect the carbon isotope values of microalgae. While, in Lake Katanuma, CCMs of the microalgae may scarcely function because of high $CO_2$ gas concentration and low pH. This is the reason for low seasonal amplitude of carbon isotope values of phytoplankton relative to those in other lakes.
Satoshi Sugino,Ken Inoue,Reo Kobayashi,Ryohei Hirose,Toshifumi Doi,Akihito Harusato,Osamu Dohi,Naohisa Yoshida,Kazuhiko Uchiyama,Takeshi Ishikawa,Tomohisa Takagi,Hiroaki Yasuda,Hideyuki Konishi,Yasuko 대한소화기 기능성질환∙운동학회 2022 Journal of Neurogastroenterology and Motility (JNM Vol.28 No.4
Background/Aims Several studies have assessed the effect of cool temperature on colonic peristalsis. Transient receptor potential melastatin 8 (TRPM8) is a temperature-sensitive ion channel activated by mild cooling expressed in the colon. We examined the antispasmodic effect of cool temperature on colonic peristalsis in a prospective, randomized, single-blind trial and based on the video imaging and intraluminal pressure of the proximal colon in rats and TRPM8-deficient mice. Methods In the clinical trial, we randomly assigned a total of 94 patients scheduled to undergo colonoscopy to 2 groups: the mildly cool water (n = 47) and control (n = 47) groups. We used 20 mL of 15°C water for the mildly cool water. The primary outcome was the proportion of subjects with improved peristalsis after treatment. In the rodent proximal colon, we evaluated the intraluminal pressure and performed video imaging of the rodent proximal colon with cool water administration into the colonic lumen. Clinical trial registry website (Trial No. UMIN-CTR; UMIN000030725). Results In the randomized controlled trial, after treatment, the proportion of subjects with no peristalsis with cool water was significantly higher than that in the placebo group (44.7% vs 23.4%; P < 0.05). In the rodent colon model, cool temperature water was associated with a significant decrease in colonic peristalsis through its suppression of the ratio of peak frequency (P < 0.05). Cool temperature-treated TRPM8-deficient mice did not show a reduction in colonic peristalsis compared with wild-type mice. Conclusion For the first time, this study demonstrates that cool temperature-dependent suppression of colonic peristalsis may be associated with TRPM8 activation.