- 著者
- Hideya So Takana Kaho Yasuyoshi Yamamoto Yuta Takahashi Mizuki Suga Yushi Shirato Naoki Kita
- 出版者
- The Institute of Electronics, Information and Communication Engineers
- 雑誌
- IEICE Communications Express (ISSN:21870136)
- 巻号頁・発行日
- vol.12, no.4, pp.114-119, 2023-04-01 (Released:2023-04-01)
- 参考文献数
- 5
Massive MIMO is expected to realize a large capacity for wireless communication technology. To reduce the number of devices of the massive MIMO, utilizing a two-dimensional Butler matrix for the feed circuit has been investigated, but complexing its design. We have proposed a Massive MIMO configuration using a stacked Butler matrix and a staircase array antenna to reduce the circuit design cost. This letter proposes a V-shape staircase array antenna with a stacked Butler matrix to reduce antenna profile. Computer simulation clarifies the beam steering range for the proposed antenna.
- 著者
- Tatsushi Nishimoto Yuta Takahashi Shohei Miyama Tadaomi Furuta Minoru Sakurai
- 出版者
- The Biophysical Society of Japan
- 雑誌
- Biophysics and Physicobiology (ISSN:21894779)
- 巻号頁・発行日
- vol.16, pp.196-204, 2019 (Released:2019-11-29)
- 参考文献数
- 41
- 被引用文献数
- 3 2
Group 3 late embryogenesis abundant (G3LEA) proteins, which act as a well-characterized desiccation protectant in anhydrobiotic organisms, are structurally disordered in solution, but they acquire a predominantly α-helical structure during drying. Thus, G3LEA proteins are now accepted as intrinsically disordered proteins (IDPs). Their functional regions involve characteristic 11-mer repeating motifs. In the present study, to elucidate the origin of the IDP property of G3LEA proteins, we applied replica exchange molecular dynamics (REMD) simulation to a model peptide composed of two tandem repeats of an 11-mer motif and its counterpart peptide whose amino acid sequence was randomized with the same amino acid composition as that of the 11-mer motif. REMD simulations were performed for a single α-helical chain of each peptide and its double-bundled strand in a wide water content ranging from 5 to 78.3 wt%. In the latter case, we tested different types of arrangement: 1) the dipole moments of the two helices were parallel or anti-parallel and 2) due to the amphiphilic nature of the α-helix of the 11-mer motif, two types of the side-to-side contact were tested: hydrophilic-hydrophilic facing or hydrophobic-hydrophobic facing. Here, we revealed that the single chain alone exhibits no IDP-like properties, even if it involves the 11-mer motif, and the hydrophilic interaction of the two chains leads to the formation of a left-handed α-helical coiled coil in the dry state. These results support the cytoskeleton hypothesis that has been proposed as a mechanism by which G3LEA proteins work as a desiccation protectant.
- 著者
- Shinya Yamazaki Shoji Kaneko Yuta Takahashi Yoshihiko Amano
- 出版者
- Japanese Society for Food Science and Technology
- 雑誌
- Food Science and Technology Research (ISSN:13446606)
- 巻号頁・発行日
- pp.FSTR-D-22-00132, (Released:2023-02-16)
- 被引用文献数
- 2
Combined medium-high hydrostatic pressure (MHHP) and medium-high temperature (MHT) treatment is an effective process for liquid impregnation and food pasteurization. Although several fruit processing additives are known to inhibit polyphenol oxidase (PPO), the effect of additives on PPO activity after MHHP+MHT treatment has not been studied. This study describes the effect of citric acid and calcium chloride on PPO activity after MHHP+MHT treatment. The lyophilized powder of Fuji apples was subjected to MHHP+MHT treatment in a solution containing sucrose, citric acid, and calcium chloride, and residual PPO activity was measured. Combined citric acid and calcium chloride additive use reduced PPO activity more effectively than their individual use. Using this additive combination to decrease PPO residual activity in conjunction with MHHP+MHT proved to decrease apple compote browning homogeneously, which we believe will prove a useful method in preservation processes.