Search results for: Atsushi Maruyama

Items from 1 to 20 out of 120 results

article

Alternative method for determining leaf CO₂ assimilation without gas exchange measurements: Performance, comparison and sensitivity analysis

Kensuke Kimura, Etsushi Kumagai, Erina Fushimi, Atsushi Maruyama

Plant, Cell & Environment > 47 > 3 > 992 - 1002

We present an alternative method to determine leaf CO₂ assimilation rate (A_n), eliminating the need for gas exchange measurements in proximal and remote sensing. This method combines the Farquhar–von Caemmerer–Berry photosynthesis model with mechanistic light reaction (MLR) theory and leaf energy balance (EB) analysis. The MLR theory estimates the actual electron transport rate (J) by leveraging chlorophyll...

article

2D–3D‐Convertible, pH‐Responsive Lipid Nanosheets

Wancheng Zhang, Shutaro Takahashi, Naohiko Shimada, Atsushi Maruyama

Small > 19 > 43 > n/a - n/a

2D nanosheets self‐assembled with amphiphilic molecules are promising tools for biomedical applications; yet, there are challenges to form and stabilize these nanosheets under complex physiological conditions. Here, the development of lipid nanosheets with high structural stability that can be reversibly converted to cell‐sized vesicles by changes in pH within the physiological range robustly, are...

article

A Cationic Copolymer Enhances Responsiveness and Robustness of DNA Circuits

Jun Wang, Hayashi Raito, Naohiko Shimada, Atsushi Maruyama

Small > 19 > 42 > n/a - n/a

Toehold‐mediated DNA circuits are extensively employed to construct diverse DNA nanodevices and signal amplifiers. However, operations of these circuits are slow and highly susceptive to molecular noise such as the interference from bystander DNA strands. Herein, this work investigates the effects of a series of cationic copolymers on DNA catalytic hairpin assembly, a representative toehold‐mediated...

article

Programmed Control of Fluorescence Blinking Patterns based on Electron Transfer in DNA

Shuya Fan, Tadao Takada, Atsushi Maruyama, Mamoru Fujitsuka, more

Chemistry – A European Journal > 29 > 19 > n/a - n/a

Fluorescence imaging uses changes in the fluorescence intensity and emission wavelength to analyze multiple targets simultaneously. To increase the number of targets that can be identified simultaneously, fluorescence blinking can be used as an additional parameter. To understand and eventually control blinking, we used DNA as a platform to elucidate the processes of electron transfer (ET) leading...

article

Turnover rates for muscle, mucus and ovary tissues of ayu fish (Plecoglossus altivelis altivelis) in multiple stages determined through carbon and nitrogen stable isotope analyses

Hayato Sawada, Sohei Fujiwara, Ryusei Tanaka, Ryuji Yonekura, more

Ecology of Freshwater Fish > 30 > 4 > 466 - 477

Stable isotope ratios are powerful indicators that facilitate the understanding of the diet shifts and between‐habitat migration of aquatic animals. However, isotopic change rate can be variable even between the life stages of a single species, which affects field data interpretation. We conducted diet‐switch experiments to compare the δ¹³C and δ¹⁵N changes in multiple tissues between the growing...

article

Control of Triplet Blinking Using Cyclooctatetraene to Access the Dynamics of Biomolecules at the Single‐Molecule Level

Jie Xu, Shuya Fan, Lei Xu, Atsushi Maruyama, more

Angewandte Chemie > 133 > 23 > 13051 - 13058

To explore the dynamics of biomolecules, tracing the kinetics of photo‐induced chemical reactions via the triplet excited state (T₁) of probe molecules offers a timescale that is about 10⁶ times wider than via the singlet excited state (S₁). Using cyclooctatetraene (COT) as a triplet energy acceptor and at the same time as a photostabilizer, the triplet–triplet energy transfer (TTET) kinetics governed...

article

Control of Triplet Blinking Using Cyclooctatetraene to Access the Dynamics of Biomolecules at the Single‐Molecule Level

Jie Xu, Shuya Fan, Lei Xu, Atsushi Maruyama, more

Angewandte Chemie International Edition > 60 > 23 > 12941 - 12948

article

Evaluation of Cooling‐Induced Liquid–Liquid Phase Separation of Ureido Polymers as a Cold‐Shock Stress Granules Model

Takuya Komachi, Atsushi Maruyama, Naohiko Shimada

Macromolecular Bioscience > 21 > 3 > n/a - n/a

Many intracellular reactions occur in membrane‐less organelles that form due to liquid–liquid phase separation (LLPS). Cold‐shock stress granules, which are membrane‐less organelles, are formed in response to a significant decrease in temperature and recruit biomolecules for regulation of their activities. The authors have reported that synthetic ureido copolymers exhibit cooling‐induced LLPS under...

article

Environmental DNA analysis shows high potential as a tool for estimating intraspecific genetic diversity in a wild fish population

Satsuki Tsuji, Atsushi Maruyama, Masaki Miya, Masayuki Ushio, more

Molecular Ecology Resources > 20 > 5 > 1248 - 1258

Environmental DNA (eDNA) analysis has recently been used as a new tool for estimating intraspecific diversity. However, whether known haplotypes contained in a sample can be detected correctly using eDNA‐based methods has been examined only by an aquarium experiment. Here, we tested whether the haplotypes of Ayu fish (Plecoglossus altivelis altivelis) detected in a capture survey could also be detected...

article

Frontispiece: Kinetics of Photoinduced Reactions at the Single‐Molecule Level: The KACB Method

Kiyohiko Kawai, Atsushi Maruyama

Chemistry – A European Journal > 26 > 35 > n/a - n/a

The kinetics of photoinduced reactions of fluorescent molecules can be observed by laser flash photolysis techniques. Considering that those techniques require substantial amounts of samples the use for analytical or diagnostic application is limited. The photophysics of a fluorescent molecule can be accessed by monitoring the kinetics of the fluctuation of fluorescence, which is called blinking....

article

Kinetics of Photoinduced Reactions at the Single‐Molecule Level: The KACB Method

Kiyohiko Kawai, Atsushi Maruyama

Chemistry – A European Journal > 26 > 35 > 7740 - 7746

The kinetics of photoinduced reactions can be approached by laser flash photolysis techniques. Although such techniques allow for a detailed understanding of the important photophysics of molecules, they normally require a substantial amount of sample for measurements (>1 nmol), and thus, they are difficult to apply to analytical and diagnostic applications. The photophysics of a fluorescent molecule...

article

Isotope analysis reveals proportional change and site‐selection variation of river‐ and lake‐produced eggs of a landlocked migratory fish

Hayato Sawada, Kanji Shigeta, Masaki Kawakami, Masahide Yuma, more

Journal of Fish Biology > 96 > 1 > 168 - 174

Changes in the proportions of river‐ and lake‐produced eggs of a landlocked amphidromous fish, ayu (Plecoglossus altivelis altivelis) in the Lake Biwa water system, Japan, were monitored by stable isotope analysis, based on different δ¹⁵N and δ¹³C values of prey organisms between the lake and its tributaries. During the 3 month reproduction season, the δ¹⁵N values of spawned eggs decreased with time...

article

Cationic Copolymer‐Chaperoned 2D–3D Reversible Conversion of Lipid Membranes

Naohiko Shimada, Hirotaka Kinoshita, Takuma Umegae, Satomi Azumai, more

Advanced Materials > 31 > 44 > n/a - n/a

Nanosheets have thicknesses on the order of nanometers and planar dimensions in the micrometer range. Nanomaterials that are capable of converting reversibly between 2D nanosheets and 3D structures in response to specific triggers can enable construction of nanodevices. Supra‐molecular lipid nanosheets and their triggered conversions to 3D structures including vesicles and cups are reported. They...

article

Degree of feeding niche overlap uniformises the distribution of interspecific territories in a Malawian cichlid community

Masaki Kawakami, Richard Zatha, Bosco Rusuwa, Atsushi Maruyama

Ecology of Freshwater Fish > 28 > 2 > 247 - 256

Cichlid fishes in the rocky littoral zones of Lake Malawi are among the most diverse endemic fish communities of the world. They segregate food resources, but considerable niche overlaps have been reported by numerous studies in this field. If their niches largely overlap, the heterospecific individuals are expected to behave like conspecific individuals. Instead of studying their niche segregation,...

article

Past history of hepatocellular carcinoma is an independent risk factor of treatment failure in patients with chronic hepatitis C virus infection receiving direct‐acting antivirals

Ayumi Sugiura, Satoru Joshita, Takeji Umemura, Tomoo Yamazaki, more

Journal of Viral Hepatitis > 25 > 12 > 1462 - 1471

Direct‐acting antiviral (DAA) treatment can achieve a high sustained virological response (SVR) rate in patients with hepatitis C virus (HCV) infection regardless of a history of hepatocellular carcinoma (HCC [+]). We examined 838 patients (370 men, median age: 69 years) who were treated with DAAs for comparisons of clinical findings between 79 HCC (+) (9.4%) and 759 HCC (−) (90.6%) patients and associations...

article

Fluorescence Redox Blinking Adaptable to Structural Analysis of Nucleic Acids

Takafumi Miyata, Naohiko Shimada, Atsushi Maruyama, Kiyohiko Kawai

Chemistry – A European Journal > 24 > 26 > 6755 - 6761

The phenomenon of blinking is unique to single‐molecule fluorescence measurements. By designing a fluorophore with an appropriate dark‐state lifetime τ_off, a kinetic analysis based on the control of fluorescence blinking (KACB) was devised to investigate the dynamics of biomolecules. By controlling the redox‐reaction‐based blinking (rKACB), conformational dynamics of RNA at the single‐molecule level...

article

Cover Feature: Fluorescence Redox Blinking Adaptable to Structural Analysis of Nucleic Acids (Chem. Eur. J. 26/2018)

Takafumi Miyata, Naohiko Shimada, Atsushi Maruyama, Kiyohiko Kawai

Chemistry – A European Journal > 24 > 26 > 6661 - 6661

By designing patterns of fluorescence blinking, that is, fluctuation in fluorescence intensity, to be affected by the microenvironment around the fluorophore, various fluorophores can be turned into environment‐sensitive probes. Nucleice acids structures, such as single strand, B‐form DNA/DNA duplex, and A‐like DNA/RNA duplex can be discriminated by monitoring the blinking patterns. This method, termed...

article

DNA Computing Boosted by a Cationic Copolymer

Naohiko Shimada, Ken Saito, Takafumi Miyata, Hiroki Sato, more

Advanced Functional Materials > 28 > 17 > n/a - n/a

The huge information storage capability of DNA and its ability to self‐assemble can be harnessed to enable massively parallel computing in a small space. DNA‐based logic gates are designed that rely on DNA strand displacement reactions; however, computation is slow due to time‐consuming DNA reassembly processes and prone to failure as DNA is susceptible to degradation by nucleases and under certain...

article

Species-specific detection of the endangered piscivorous cyprinid fish Opsariichthys uncirostris uncirostris, three-lips, using environmental DNA analysis

Hiroki Yamanaka, Daiki Takao, Atsushi Maruyama, Akio Imamura

Ecological Research > 2018 > 33 > 5 > 1075-1078

Opsariichthys uncirostris uncirostris is a subspecies of Amur three-lips Opsariichthys uncirostris (Temminck and Schlegel, 1846) and endemic to Japan. This only piscivorous fish among Cyprinidae in Japan, hereafter three-lips, is in a unique ecological situation, that is, the species is endangered in the native habitats such as Lake Biwa water system and Lake Mikata, but on the other hand, three-lips...

article

Increasing canopy photosynthesis in rice can be achieved without a large increase in water use—A model based on free‐air CO₂ enrichment

Hiroki Ikawa, Charles P. Chen, Martin Sikma, Mayumi Yoshimoto, more

Global Change Biology > 24 > 3 > 1321 - 1341

Achieving higher canopy photosynthesis rates is one of the keys to increasing future crop production; however, this typically requires additional water inputs because of increased water loss through the stomata. Lowland rice canopies presently consume a large amount of water, and any further increase in water usage may significantly impact local water resources. This situation is further complicated...

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INFONA - science communication portal

Search results for: Atsushi Maruyama

Alternative method for determining leaf CO₂ assimilation without gas exchange measurements: Performance, comparison and sensitivity analysis

2D–3D‐Convertible, pH‐Responsive Lipid Nanosheets

A Cationic Copolymer Enhances Responsiveness and Robustness of DNA Circuits

Programmed Control of Fluorescence Blinking Patterns based on Electron Transfer in DNA

Turnover rates for muscle, mucus and ovary tissues of ayu fish (Plecoglossus altivelis altivelis) in multiple stages determined through carbon and nitrogen stable isotope analyses

Control of Triplet Blinking Using Cyclooctatetraene to Access the Dynamics of Biomolecules at the Single‐Molecule Level

Control of Triplet Blinking Using Cyclooctatetraene to Access the Dynamics of Biomolecules at the Single‐Molecule Level

Evaluation of Cooling‐Induced Liquid–Liquid Phase Separation of Ureido Polymers as a Cold‐Shock Stress Granules Model

Environmental DNA analysis shows high potential as a tool for estimating intraspecific genetic diversity in a wild fish population

Frontispiece: Kinetics of Photoinduced Reactions at the Single‐Molecule Level: The KACB Method

Kinetics of Photoinduced Reactions at the Single‐Molecule Level: The KACB Method

Isotope analysis reveals proportional change and site‐selection variation of river‐ and lake‐produced eggs of a landlocked migratory fish

Cationic Copolymer‐Chaperoned 2D–3D Reversible Conversion of Lipid Membranes

Degree of feeding niche overlap uniformises the distribution of interspecific territories in a Malawian cichlid community

Past history of hepatocellular carcinoma is an independent risk factor of treatment failure in patients with chronic hepatitis C virus infection receiving direct‐acting antivirals

Fluorescence Redox Blinking Adaptable to Structural Analysis of Nucleic Acids

Cover Feature: Fluorescence Redox Blinking Adaptable to Structural Analysis of Nucleic Acids (Chem. Eur. J. 26/2018)

DNA Computing Boosted by a Cationic Copolymer

Species-specific detection of the endangered piscivorous cyprinid fish Opsariichthys uncirostris uncirostris, three-lips, using environmental DNA analysis

Increasing canopy photosynthesis in rice can be achieved without a large increase in water use—A model based on free‐air CO₂ enrichment

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