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( Sakatoku akihiro ),( Daisuke Tanaka ),( Shogo Nakamura ) 한국미생물 · 생명공학회 2013 Journal of microbiology and biotechnology Vol.23 No.6
In a previous study, we isolated and reported a second species of the Saccharophagus genus, Saccharophagus sp. strain Myt-1. In the present study, an alginate lyase gene (algMytC) from the genomic DNA of Myt-1 was cloned and characterized. The DNA sequence fragment obtained contained an open reading frame of 1,032 bp that encoded a protein of 343 amino acids with an estimated molecular mass of 37.6 kDa and a pI of 6.60. The deduced protein, AlgMytC, had the conserved amino acid sequences (RTELREM, QIH, YFKAGVYNQ) of the polysaccharide lyase family 7. A BLAST homology search indicated that AlgMytC shared an amino acid sequence identity of 95.9% with alg7A of S. degradans 2-40. The cloned and purified AlgMytC protein showed optimal activity at 40oC, and retained more than 90% of its total activity even after treatment at 25oC for 24 h. AlgMytC was very alkaliphilic with an optimal pH of 9.0, and more than 90% of its activity was retained in the pH range 8.5-10.0. Moreover, AlgMytC was stable over a wide pH range. The activity of AlgMytC was also stable in the presence of various detergents.
Tanaka, Tsutomu,Mulyadi, I Ketut,Moestikaningsih, Moestikaningsih,Oka, Tjok Gede,Soeripto, Soeripto,Triningsih, FX Ediati,Triyono, Teguh,Heriyanto, Didik Setyo,Hosono, Akihiro,Suzuki, Sadao,Tokudome, Asian Pacific Journal of Cancer Prevention 2016 Asian Pacific journal of cancer prevention Vol.17 No.3
The incidence rate of stomach cancer in Bali, Indonesia, is estimated to be strikingly lower than that in Japan. We conducted an on-site ecological study to investigate the association between the stomach cancer incidence and Helicobacter pylori (H. pylori) infection. Recruiting 291 healthy persons (136 men and 155 women) from the general population in Bali, Indonesia, we conducted a urea breath test (UBT) to examine H. pylori infection, along with a pepsinogen test to detect chronic atrophic gastritis and urine analysis to estimate sodium and potassium excretion. UBT positivities were 9% (2-15, 95% confidence interval) for men and 7% (1-12) for women, and positive cases for H. pylori IgG antibodies were 1% (0-3) for men and 3% (0-5) for women, significantly lower than the respective values in Japan. Positive pepsinogen tests in Bali were 0% (0-0) for men and 1% (0-4) for women, also significantly lower than the Japanese figures. Computed values for daily salt excretion were $13.3{\pm}4.1g$ (mean${\pm}$SD) for men and $11.1{\pm}3.1g$ for women, as high as corresponding Japanese consumption values. Moreover, the estimated potassium excretion was $3.2{\pm}0.7g$ for men and $2.8{\pm}0.6g$ for women in Bali, significantly higher than the figures in Japan. There were no associations across genetic polymorphisms of IL-beta, TNF-alpha, and PTPN11 with UBT positivity. The low incidence of stomach cancer in Bali may thus mainly be due to the rare H. pylori infection. Namely, the bacterium infection seems to be a critical factor for gastric cancer rather than host or other environmental factors.
4-Thiazinyl-1235-dithiadiazolyl cation: robustferromagnetic coupling against conformational change
Akihiro Ito,Masashi Urabe,Haruhiro Ino,Kazuyoshi Tanaka 한국물리학회 2005 Current Applied Physics Vol.5 No.2
Quantum chemical calculations employing two-conguration self-cosistent eld theory and density functional theory have beencarried out for a new diradical cation composed of two ring systems, 1,4-thiazine and 1,2,3,5-dithiadiazolyl. These ring systems arecoupled through a central CAN bond, and hence, the free rotation are allowed for this diradical cation. However, the singlettripletenergy splitting has been predicted to be positive for every dihedral angle between two ring systems. Moreover, the cation diradicalwas found to be isoelectronic with trimethylenemethane in the planar conformation. This fact is deeply related with the robustnessof high-spin correlation of the diradical cation..
Tribological Properties of Sintered Diamonds with WC-Co Matrix
Umeda, Kazunori,Tanaka, Akihiro,Takatsu, Sokichi The Korean Ceramic Society 1997 The Korean journal of ceramics Vol.3 No.3
Sintered diamond/(WC-Co) composites were prepared by spark plasma sintering technique. Tribological properties were measured at temperatures from RT to $500^{\circ}C$ in sliding tests with alumina ball. They show coefficient of friction of 0.1 and below at RT and wear of the diamond composites is hardly detected. Effects of diamond grit size, diamond content and test temperature on the coefficient of friction and the wear are discussed. The wear scars were analyzed.
Kuroda Kazutaka,Tanaka Akihiro,Furuhashi Kenichi,Fukuju Naoki 아세아·태평양축산학회 2022 Animal Bioscience Vol.35 No.7
Objective: The objective of this study was to evaluate the effect of waste cooking oil (WCO) addition on ammonia (NH3) emissions during the composting of dairy cattle manure under two aeration conditions. Methods: The composting tests were conducted using the laboratory-scale composting apparatuses (14 L of inner volume). Three composting treatments (Control, WCO1.5, and WCO3, with WCO added at 0 wt%, 1.5 wt%, and 3 wt% of manure, respectively) were performed in two composting tests: aeration rate during composting was changed from 0.55 to 0.45 L/min in Test 1, and fixed at 0.3 L/min in Test 2, respectively. The NH3 emitted and nitrogen losses during the composting were analyzed, and the effect of the addition of WCO on NH3 emissions were evaluated. Results: Both tests indicated that the composting mixture temperature increased while the weight and water content decreased with increasing WCO content of the composting mixtures. On the other hand, the NH3 emissions and nitrogen loss trends observed during composting in Tests 1 and 2 were different from each other. In Test 1, NH3 emissions and nitrogen losses during composting increased with increasing WCO contents of the composting samples. Conversely, in Test 2, they decreased as the WCO contents of the samples increased. Conclusion: The WCO addition showed different effect on NH3 emissions during composting under two aeration conditions: the increase in WCO addition ratio increased the emissions under the higher aeration rate in Test 1, and it decreased the emissions under the lower aeration rate in Test 2. To obtain reduction of NH3 emissions by adding WCO with the addition ratio ≤3 wt% of the manure, aeration should be considered. Objective: The objective of this study was to evaluate the effect of waste cooking oil (WCO) addition on ammonia (NH<sub>3</sub>) emissions during the composting of dairy cattle manure under two aeration conditions.Methods: The composting tests were conducted using the laboratory-scale composting apparatuses (14 L of inner volume). Three composting treatments (Control, WCO1.5, and WCO3, with WCO added at 0 wt%, 1.5 wt%, and 3 wt% of manure, respectively) were performed in two composting tests: aeration rate during composting was changed from 0.55 to 0.45 L/min in Test 1, and fixed at 0.3 L/min in Test 2, respectively. The NH<sub>3</sub> emitted and nitrogen losses during the composting were analyzed, and the effect of the addition of WCO on NH<sub>3</sub> emissions were evaluated.Results: Both tests indicated that the composting mixture temperature increased while the weight and water content decreased with increasing WCO content of the composting mixtures. On the other hand, the NH<sub>3</sub> emissions and nitrogen loss trends observed during composting in Tests 1 and 2 were different from each other. In Test 1, NH<sub>3</sub> emissions and nitrogen losses during composting increased with increasing WCO contents of the composting samples. Conversely, in Test 2, they decreased as the WCO contents of the samples increased.Conclusion: The WCO addition showed different effect on NH<sub>3</sub> emissions during composting under two aeration conditions: the increase in WCO addition ratio increased the emissions under the higher aeration rate in Test 1, and it decreased the emissions under the lower aeration rate in Test 2. To obtain reduction of NH<sub>3</sub> emissions by adding WCO with the addition ratio ≤3 wt% of the manure, aeration should be considered.
Kazutaka Kuroda,Akihiro Tanaka,Kenichi Furuhashi,Naoki Fukuju Asian Australasian Association of Animal Productio 2023 Animal Bioscience Vol.36 No.10
Objective: In our previous study, we observed that the addition of waste cooking oil (WCO) reduced ammonia (NH<sub>3</sub>) emissions during laboratory-scale composting of dairy cattle manure under low-aeration condition. Therefore, this study aimed to evaluate the effect of addition of WCO on NH<sub>3</sub> emissions reduction during pilot-scale composting of dairy cattle manure, which is close to the conditions of practical composting treatment. Methods: Composting tests were conducted using pilot-scale composting facilities (1.8 m<sup>3</sup> of capacity). The composting mixtures were prepared from manure, sawdust, and WCO. Two treatments were set: without WCO (Control) and with WCO added to 3 wt% of manure (WCO3). Composting was conducted under continuous aeration at 40 L/min, corresponding to 22.2 L/(min·m<sup>3</sup>) of the mixture at the start of composting. The changes in temperatures, NH<sub>3</sub> concentrations in the exhaust gases, and contents of the composted mixtures were analyzed. Based on these analysis results, the effect of WCO addition on NH<sub>3</sub> emissions and nitrogen loss during composting was evaluated. Results: During composting, the temperature increase of the composting mixture became higher, and the decreases of weight and water content of the mixture became larger in WCO3 than in Control. In the decrease of weight, and the residual weight and water content of the mixture, significant differences (p<0.05) were detected between the two treatments at the end of composting. The NH<sub>3</sub> concentrations in the exhaust gases tended to be lower in WCO3 than in Control. Nitrogen loss was 21.5% lower in WCO3 than in Control. Conclusion: Reduction of NH<sub>3</sub> emissions by the addition of WCO under low aeration condition was observed in pilot-scale composting, as well as in laboratory-scale composting. This result suggests that this method is effective in reducing NH<sub>3</sub> emissions in practical-scale composting.