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Frequency Analysis of intracellular signal transduction systems
Hiroki Ishiyama,Takashi Nakakuki,Chiharu Ishii,Mitsuo Kobayashi 제어로봇시스템학회 2010 제어로봇시스템학회 국제학술대회 논문집 Vol.2010 No.10
In this paper, we propose two analysis methods for a complicated and huge biological system. As a practical biological system, we employ a newly published signal transduction system with transcriptional control. For such a system, only few analysis tools such as parameter sensitivity analysis are available. First, we extend the concept of Bode diagram, including the effect of changes of both amplitude are frequency of input signal on output response. Next, we introduce the calculation of the L2-induced gain. Although it is difficult to find the nominal gain theoretically, we show that the distribution of the gain over various amplitudes and frequencies of input signal provides us some useful information in a biological system.
Photoadaptation of Green Sulfur Photosynthetic Bacteria Chlorobium phaeobacteroides
Hirabayashi, Hiroki,Ohmura, Satoshi,Ishii, Takasada,Takaichi, Shinichi,Uehara, Kaku Korean Society of Photoscience 2002 Journal of Photosciences Vol.9 No.2
Photoadaptation of Chlorobium (Cb.) phaeobacteroides was investigated under dim and strong light intensity. Absorption spectra of these whole cellIs were different each other. The Soret band intensity and the Qy bandwidth of BChl e in c디l grown under dim light intensity were smaller and more broadened than those under strong light intensity. From HPLC analysis of the pigments, total carotenoid (Car) / bacterochorolphyll (BChl) e ratio of cell increased wi1h increase of light intensities. But camposition of BChl e hamologs almost unchanged. Cb. phaeobacteroides contains 11 kinds of Car including isorenieratene and beta-isorenieratene as major Car. The campositions of Car were different for cells grown under dim and strong light intensities. In conclusion, Cb. phaeobacteroides changes total amount and canposition of Car to adapt various light intensities, while homolog canposition of BChle unchange.
Effect of Carotenoides on the in vitro Aggregation of Bacteriochlorophyll e
Hirabayashi, Hiroki,Ohmura, Satoshi,Ishii, Takasada,Uehara, Kaku Korean Society of Photoscience 2002 Journal of Photosciences Vol.9 No.2
In order to investigate effect of the carotenoids (Car) on aggregation of Bacterochlorophyll (BChl) in chlorosome, we studied the spectral difference in aggregates of BChl e formed in the absence and presence of a few kinds of Car in dimethyl sulfoxide (DMSO) -water solution. The absorption spectra of aggregates made of only BChl e and those made of a mixture of BChl e and Car were almost the same. However, the kinetics and circular dichroism (CD) spectra of aggregate of these were markedly different by kind of Car. Specifically, the rate of aggregation for a mixture of BChl e and isorenietene that contains phenyl as end groupe was faster than that for only BChl e. CD spectra of aggregates made of a mixture of BChl e and isorenietene dramatically changed compared to that made of only BChl e. We propose that BChl might form several kinds of rod-like supramolecular structures to in the presence of some kind of Car in chlorosome.
( Keiji Hirai ),( Susumu Ookawara ),( Junki Morino ),( Saori Minato ),( Shohei Kaneko ),( Katsunori Yanai ),( Hiroki Ishii ),( Momoko Matsuyama ),( Taisuke Kitano ),( Mitsutoshi Shindo ),( Haruhisa Mi 대한신장학회 2020 Kidney Research and Clinical Practice Vol.39 No.4
Background: Few studies have investigated the relationship between serum total carbon dioxide (CO<sub>2</sub>) concentration and bicarbonate ion (HCO<sub>3</sub> <sup>-</sup>) concentration in patients undergoing hemodialysis. We determined the agreement and discrepancy between serum total CO<sub>2</sub> and HCO<sub>3</sub> <sup>-</sup> concentrations and the diagnostic accuracy of serum total CO<sub>2</sub> for the prediction of low (HCO<sub>3</sub> <sup>-</sup> < 24 mEq/L) and high (HCO<sub>3</sub> <sup>-</sup> ≥ 24 mEq/L) bicarbonate concentrations in hemodialysis patients. Methods: One hundred forty-nine arteriovenous blood samples from 84 hemodialysis patients were studied. Multiple linear regression analysis was used to determine factors correlated with HCO<sub>3</sub> <sup>-</sup> concentration. Diagnostic accuracy of serum total CO<sub>2</sub> was evaluated using receiver operating characteristic curve analysis and a 2 × 2 table. Agreement between serum total CO<sub>2</sub> and HCO<sub>3</sub> <sup>-</sup> concentrations was assessed using Bland-Altman analysis. Results: Serum total CO<sub>2</sub> concentration was closely correlated with HCO<sub>3</sub> <sup>-</sup> concentration (β = 0.858, P < 0.001). Area under the curve of serum total CO<sub>2</sub> for the identification of low and high bicarbonate concentrations was 0.989. Use of serum total CO<sub>2</sub> to predict low and high bicarbonate concentrations had a sensitivity of 100%, specificity of 50.0%, positive predictive value of 96.5%, negative predictive value of 100%, and accuracy of 96.6%. Bland-Altman analysis showed moderate agreement between serum total CO<sub>2</sub> and HCO<sub>3</sub> <sup>-</sup> concentrations. Discrepancies between HCO<sub>3</sub> <sup>-</sup> and serum total CO<sub>2</sub> concentrations (serum total CO<sub>2</sub> - HCO<sub>3</sub> <sup>-</sup> ≤ -1) were observed in 89 samples. Conclusion: Serum total CO<sub>2</sub> concentration is closely correlated with HCO<sub>3</sub> <sup>-</sup> concentration in hemodialysis patients. However, there is a non-negligible discrepancy between serum total CO<sub>2</sub> and HCO<sub>3</sub> <sup>-</sup> concentrations.
Keiji Hirai,Saori Minato,Shohei Kaneko,Katsunori Yanai,Hiroki Ishii,Taisuke Kitano,Mitsutoshi Shindo,Haruhisa Miyazawa,Kiyonori Ito,Yuichirou Ueda,Yoshio Kaku,Taro Hoshino,Tatsuro Watano,Shinji Fujino 대한신장학회 2019 Kidney Research and Clinical Practice Vol.38 No.3
Background: We investigated the relationship between serum total carbon dioxide (CO2) and bicarbonate ion (HCO3 -) concentrations in pre-dialysis chronic kidney disease (CKD) patients and devised a formula for predicting low bicarbonate (HCO3 - < 24 mmol/L) and high bicarbonate (HCO3 - ≥ 24 mmol/L) using clinical parameters. Methods: In total, 305 samples of venous blood collected from 207 pre-dialysis patients assessed by CKD stage (G1 + G2, 46; G3, 50; G4, 51; G5, 60) were investigated. The relationship between serum total CO2 and HCO3 - concentrations was analyzed using Pearson’s correlation coefficient. An approximation formula was developed using clinical parameters correlated independently with HCO3 - concentration. Diagnostic accuracy of serum total CO2 and the approximation formula was evaluated by receiver operating characteristic curve analysis and a 2 × 2 table. Results: Serum total CO2 correlated strongly with HCO3 - concentration (r = 0.91; P < 0.001). The following approximation formula was obtained by a multiple linear regression analysis: HCO3 - (mmol/L) = total CO2 - 0.5 × albumin - 0.1 × chloride - 0.01 × (estimated glomerular filtration rate + blood glucose) + 15. The areas under the curves of serum total CO2 and the approximation formula for detection of low bicarbonate and high bicarbonate were 0.981, 0.996, 0.993, and 1.000, respectively. This formula had superior diagnostic accuracy compared with that of serum total CO2 (86.6% vs. 81.3%). Conclusion: Serum total CO2 correlated strongly with HCO3 - concentration in pre-dialysis CKD patients. An approximation formula including serum total CO2 showed superior diagnostic accuracy for low and high bicarbonate compared with serum total CO2.