1.

論文(リポジトリ)

論文(リポジトリ)
Imura, Yoshimi ; Nakamura, Ichiro ; Juntasin, Weenaporn ; Hossain, Mohammad Amzad ; Thaikua, Sarayut ; Poungkaew, Rattikan ; Kawamoto, Yasuhiro
出版情報: Agronomy.  14  pp.1-14,  2024-02-29.  © 2024 by the authors. Licensee MDPI, Basel, Switzerland.
概要: Two field trials were conducted in Northern Thailand from 2018 to 2020 to determine the best manual harvesting method fo r maximizing seed yield and seed quality of two Urochloa ruziziensis cultivars, cv. OKI-1 and cv. Br-203. Four manual seed harvesting methods were implicated in a randomized complete block design with four replicates. The four methods were as follows: knocking seeds from seedheads into a nylon net receptacle and collecting them once every day (T1); knocking seeds from seedheads into a nylon net receptacle and collecting them once every three days (T2); allowing ripe seeds to fall into a nylon net sheet that was stretched as a receptacle beneath the seedheads and collecting seeds once every five days (T3); and covering the tied seedheads with a nylon net bag and collecting seeds once every five days (T4). The highest pure seed yield was obtained from T3 in cv. Br-203 (333.11 kg/ha), as well as the highest trend in cv. OKI-1 (534.67 kg/ha). T3 produced 22–46% and 11–27% more pure germinated seed yields than the other methods in cv. Br-203 and cv. OKI-1, respectively. As a result, T3 was recommended for higher seed yield, convenient seed harvest, and reduced manual seed harvest time. 続きを見る
2.

論文(リポジトリ)

論文(リポジトリ)
Farooqi, Javed Ahmad ; Ono, Hiroko
出版情報: Japan Architectural Review.  7  pp.1-15,  2024-01-03.  Japan Architectural Review published by John Wiley & Sons Australia, Ltd on behalf of Architectural Institute of Japan.
概要: This study evaluates land use transformation in Kandahar’s old city, also known as Ahmad Shahi city, the birthplace and first capital of modern Afghanistan. The city consists of four rectangular quarters and is surrounded by a high strong mud wall, entrance gates, and a moat. In the early 20th century, the city experienced significant and arbitrary expansion, which certainly affected the urban fabric of the area, the streets were widened, and the city wall, towers, and gates were demolished, and the area was added to the construction of new government buildings, commercial establishments, and residential plots. This study aims to evaluate the alterations in the old city’s urban morphology, culture, and sociology by conducting a comparative analysis of three maps from different time periods and considering various factors within the target area. 続きを見る
3.

論文(リポジトリ)

論文(リポジトリ)
宮国, 薫子 ; Miyakuni, Kaoruko
出版情報: 琉球大学経営研究 — University of the Ryukyus Management Research.  pp.1-15,  2024-01.  国際地域創造学部 経営プログラム — Faculty of Global and Regional Studies, Management Program
概要: Tourism is one of the major economic drivers of small island developing nations (SIDs). Republic of Palau is one of the countries which depends heavily on tourism for their economy. In 2015, United Nations adopted Sustainable Development Goals (SDGs) and required member nations to submit Voluntary National Review (VNR) to develop their economies guided by SDGs. This thesis aims to clarify the relationship between tourism and SDGs by introducing history, culture, tourism, and VNR of Republic of Palau regarding SDGs 8 (Decent Work and Economic Growth), 12 (Responsible Production and Consumption), and 14 (Life below Water) . 続きを見る
4.

論文(リポジトリ)

論文(リポジトリ)
Ito, Masahiko
出版情報: Ryukyu Mathematical Journal.  36  pp.1-47,  2023-12-28.  琉球大学理学部数理科学教室
概要: We provide explicit expressions for two types of first order q-difference systems for the Jackson integral of symmetric Selberg type. One is the q- difference system known to be the q-KZ equation and the other is the q-difference system for parameters different from the q-KZ equation. We use a basis of the systems introduced by Matsuo in his study of the q-KZ equation. As a result, the similarity of these two systems is discussed by concrete calculations. Interme- diate calculations are made use of the Riemann-Hilbelt method for q-difference equation from connection matrix established by Aomoto. 続きを見る
5.

論文(リポジトリ)

論文(リポジトリ)
Kimoto, Kazufumi
出版情報: Ryukyu Mathematical Journal.  36  pp.49-68,  2023-12-28.  琉球大学理学部数理科学教室
概要: We establish a formula for the two-variable zeta functions for graphs introduced by Lorenzini, and use it to give explicit formulas of the zeta functions for dipole graphs, doubled trees and friendship graphs. We observe that the two-variable zeta functions for these graphs have a unified formula expressed using the Tutte polynomials. 続きを見る
6.

論文(リポジトリ)

論文(リポジトリ)
Sudo, Takahiro
出版情報: Ryukyu Mathematical Journal.  36  pp.69-112,  2023-12-28.  琉球大学理学部数理科学教室
概要: We study the entire cyclic cohomology theory for Banach algebras by following a part of the noncommutative geometric theory invented by Connes.
7.

論文(リポジトリ)

論文(リポジトリ)
Toda, Kei ; Obolkin, Vladimir ; Ohira, Shin-Ichi ; Saeki, Kentaro
出版情報: communications biology.  pp.1-10,  2023-11-24.  Springer Nature
概要: Phytoplanktonic dinoflagellates form colonies between vertical ice crystals during the icemelting season in Lake Baikal, but how the plankton survive the freezing conditions is not known. Here we show that the phytoplankton produces large amounts of dimethylsulfoniopropionate (DMSP), which is best-known as a marine compound. Lake-water DMSP concentrations in the spring season are comparable with those in the oceans, and colony water in ice exhibits extremely high concentrations. DMSP concentration of surface water correlates with plankton density and reaches a maximum in mid-April, with temperature-dependent fluctuations. DMSP is released from plankton cells into water in warm days. DMSP is a characteristic osmolyte of marine algae; our results demonstrate that freshwater plankton, Gymnodinium baicalense, has DMSP-producing ability, and efficiently uses the limited sulfur resource (only 1/500 of sea sulfate) to survive in freshwater ice. Plankton in Lake Baikal do not need an osmolyte, and our results clearly indicate that DMSP plays a cryoprotective role. DMSP, although a characteristic marine compound, could also be an important zwitterion for algae of other boreal lakes, alpine snow, and glaciers. 続きを見る
8.

論文(リポジトリ)

論文(リポジトリ)
Hanzawa, Eiko ; Sasaki, Kazuhiro ; Nagai, Shinsei ; Obara, Mitsuhiro ; Fukuta, Yoshimichi ; Uga, Yusaku ; Miyao, Akio ; Hirochika, Hirohiko ; Higashitani, Atsushi ; Maekawa, Masahiko ; Sato, Tadashi
出版情報: Rice.  6  2023-11-11.  Springer
URL: http://hdl.handle.net/20.500.12000/0002019894
概要: Background: Root system architecture is an important trait affecting the uptake of nutrients and water by crops. Shallower root systems preferentially take up nutrients from the topsoil and help avoid unfavorable environments in deeper soil layers. We have found a soil-surface rooting mutant from an M2 population that was regenerated from seed calli of a japonica rice cultivar, Nipponbare. In this study, we examined the genetic and physiological characteristics of this mutant. Results: The primary roots of the mutant showed no gravitropic response from the seedling stage on, whereas the gravitropic response of the shoots was normal. Segregation analyses by using an F2 population derived from a cross between the soil-surface rooting mutant and wild-type Nipponbare indicated that the trait was controlled by a single recessive gene, designated as sor1. Fine mapping by using an F2 population derived from a cross between the mutant and an indica rice cultivar, Kasalath, revealed that sor1 was located within a 136-kb region between the simple sequence repeat markers RM16254 and 2935-6 on the terminal region of the short arm of chromosome 4, where 13 putative open reading frames (ORFs) were found. We sequenced these ORFs and detected a 33-bp deletion in one of them, Os04g0101800. Transgenic plants of the mutant transformed with the genomic fragment carrying the Os04g0101800 sequence from Nipponbare showed normal gravitropic responses and no soil-surface rooting. Conclusion: These results suggest that sor1, a rice mutant causing soil-surface rooting and altered root gravitropic response, is allelic to Os04g0101800, and that a 33-bp deletion in the coding region of this gene causes the mutant phenotypes. 続きを見る
9.

論文(リポジトリ)

論文(リポジトリ)
Osada, Yohei ; 長田, 庸平
出版情報: Fauna Ryukyuana.  68  pp.27-28,  2023-10-12.  琉球大学資料館 (風樹館)
URL: http://hdl.handle.net/20.500.12000/0002020042
概要: Tornodoxa paraleptopalta Ueda is newly recorded from Yakushima Island, Kagoshima Prefecture. The specimen of adult and t he male genitalia are shown. This species is recorded from the Ryukyu Islands for the first time.
ヒメハイジロキバガは大阪府産の標本に基づいて記載され, これまで日本 (本州, 九州) および台湾から知られていた. 大阪市立自然史博物館での標本調査において, 屋久島産の本種の標本が確認されたので, ここに記録する. 琉球列島では初記録である.
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10.

論文(リポジトリ)

論文(リポジトリ)
Osada, Yohei ; 長田, 庸平
出版情報: Fauna Ryukyuana.  68  pp.29-30,  2023-10-12.  琉球大学資料館 (風樹館)
URL: http://hdl.handle.net/20.500.12000/0002020043
概要: Lopharcha psathyra Diakonoff is newly recorded from Yakushima Island. The specimen and female genitalia are shown. This species is recorded from the Ryukyu Islands for the first time.
スジケマダラハマキはこれまで日本の本州, 四国, 九州から知られていた.寄主植物は, クスノキ科のシロダモとクスノキである. 大阪市立自然史博物館での標本調査において, 屋久島産の本種の標本が確認されたので, 琉球列島初記録としてここに記録する.
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