Correction to: Geographical variation in spawning histories of age-1 Pacific saury Cololabis saira in the North Pacific Ocean during June and July     

Suyama  Satoshi  Ozawa  Hitomi  Shibata  Yasutoki  Fuji  Taiki  Nakagami  Masayasu  Shimizu  Akio 《Fisheries Science》2020,86(3):597-597

Fisheries Science - The article "Geographical variation in spawning histories of age 1 Pacific saury Cololabis saira in the North Pacific Ocean during June and July", written by Satoshi...  相似文献   

Effect of blue and red LED light irradiation on β-cryptoxanthin accumulation in the flavedo of citrus fruits     

Ma G  Zhang L  Kato M  Yamawaki K  Kiriiwa Y  Yahata M  Ikoma Y  Matsumoto H 《Journal of agricultural and food chemistry》2012,60(1):197-201

β-Cryptoxanthin (β-cry), an antioxidant abundant in citrus fruits, plays an important role in the prevention and treatment of certain diseases, especially cancers. In the present study, to increase the content of β-cry in citrus flavedo, the effects of blue (470 nm) and red (660 nm) light-emitting diode (LED) lights on the accumulation of carotenoids and expression of genes related to carotenoid biosynthesis were investigated in the flavedo of Satsuma mandarin. The results showed that accumulation of β-cry was induced by red light, while it was not affected by blue light. The accumulation of β-cry under red light was attributed to simultaneous increases in the expression of CitPSY, CitPDS, CitZDS, CitLCYb1, CitLCYb2, CitHYb, and CitZEP. The results presented herein might provide new strategies to enhance the commercial and nutritional value of citrus fruits.  相似文献   

Arsenic extractability with phosphate and citrate from peat collected in Bangladesh     

Chikako Yamazaki  Kazuhito Itoh  Naoko Higashi  Hiroaki Ishiga  Kousuke Suyama  Hiroki Yamamoto 《Soil Science and Plant Nutrition》2013,59(6):859-865

Abstract

Arsenic extractability with various solutions from peat samples collected in Deuli Village, Bangladesh, was investigated to reveal the leaching mechanisms of arsenic in sediments to groundwater. Peat layer was distributed at the depth of 7–8 m in the sediments, and the peat samples collected and used in this experiment contained 137 mg kg^?1 arsenic. A wide range of pH values and concentrations of phosphoric acid and trisodium citrate was used for the extracting solutions. Arsenic extractability with Hel (25–1,000 mM) or NaOH (20–500 mM) at different pH values ranged for 30 to 60% in strong acid or alkali, while was less than 0.1% in the neutral pH range against the total content. Extraction of arsenic with 100 mM phosphoric acid and 100 mM trisodium citrate was about 20% even at a neutral pH, while the extractability with these solutions at concentrations below 1 mM was similar to that with distilled water. These results suggest that competitive exchange and / or chelating action are / is the prior possible mechanism for arsenic leaching from peat. However, the experimental conditions such as pH value or phosphate anion concentration differed from those in the study area where the pH of groundwater was almost neutral and the phosphate anion concentration was only 0.01 mM. Moreover, since the experiment was conducted using a batch system under oxidative conditions and not using a continuous flow system, the importance of the oxidation-reduction potential in the sediments and organic matter content in the groundwater should be investigated.  相似文献   

Detection of novel kobu-like viruses in Japanese black cattle in Japan     

Konosuke OTOMARU  Yuki NAOI  Kei HAGA  Tsutomu OMATSU  Takehiko UTO  Motoya KOIZUMI  Tsuneyuki MASUDA  Hiroshi YAMASATO  Hikaru TAKAI  Hiroshi AOKI  Shinobu TSUCHIAKA  Kaori SANO  Sachiko OKAZAKI  Yukie KATAYAMA  Mami OBA  Tetsuya FURUYA  Junsuke SHIRAI  Kazuhiko KATAYAMA  Tetsuya MIZUTANI  Makoto NAGAI 《The Journal of veterinary medical science / the Japanese Society of Veterinary Science》2016,78(2):321-324

During surveillance for bovine diarrhea of unknown causes in Japanese black cattle in Kagoshima Prefecture, Japan, we found two types of novel kobu-like viruses in fecal samples of calves. Sequence analyses revealed that they had L protein and 2A protein with H-box/NC sequence motif, which are present in kobuviruses. Phylogenetic analysis revealed that they were related to kobuviruses; however, they clustered apart from other kobuviruses. In the prevalence study of two types of novel kobu-like viruses, 16.9% and 10.4% prevalence of these viruses were observed in the feces of diarrheal calves in this area.  相似文献   

Environmental influences on late-summer individual Japanese eel diel activity and space utilization patterns in a shallow western Japan brackish lake     

Itakura  Hikaru  Miyake  Yoichi  Wakiya  Ryoshiro  Kimura  Shingo 《Fisheries Science》2022,88(1):29-43

The late-summer diel activity patterns and space utilization of five Japanese eels, Anguilla japonica, were investigated using an acoustic telemetry positioning system in a shallow brackish lake in western Japan. Eels were highly nocturnal and crepuscular, with 98.1% of positions detected between sunset and sunrise, and were more active during dusk and dawn compared with nighttime, and during full moons compared with other lunar periods. Most diurnal activity occurred during darker conditions, and two individuals extended their activity into the morning, suggesting that overcast skies reduced light intensity and prolonged nocturnal activity into daytime. Individual eels had different home-range patterns, but appeared to rest nearshore during the day, with space utilization expanding offshore at dusk and night, followed by returning to nearshore at dawn. Their home ranges and core activity areas were bordered by the shoreline, with eels tending to exhibit small activity spaces and strong site fidelity. This study provides valuable ecological knowledge about the individual behavior of eels inhabiting a small brackish lake at the northern limit of the natural distributional range of the species along the Sea of Japan, which can contribute to management and conservation of the species.

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Modeling the growth,transport, and feeding migration of age-0 Pacific saury Cololabis saira     

Oyaizu  Hitomi  Suyama  Satoshi  Ambe  Daisuke  Ito  Shin-ichi  Itoh  Sachihiko 《Fisheries Science》2022,88(1):131-147

Fisheries Science - In this study, we developed an individual-based model for age-0 Pacific saury Cololabis saira focusing on the winter-spawned cohort to advance our understanding of the dynamic...  相似文献   

Phospholipase Cζ (PLCζ) versus postacrosomal sheath WW domain‐binding protein (PAWP): Which molecule will survive as a sperm factor?     

Michiko Nakai  Junya Ito  Ayumi Suyama  Atsuko Kageyama  Yasuko Tobari  Naomi Kashiwazaki 《Animal Science Journal》2020,91(1)

During mammalian fertilization, sperm is fused with the oocyte's membrane, triggering the resumption of meiosis from the metaphase II arrest, the extrusion of the second polar body, and the exocytosis of cortical granules; these events are collectively called 'oocyte activation.' In all species studied to date, the transient rise in the cytosolic level of calcium (in particular, the repeated calcium increases called 'calcium oscillations' in mammals) is required for these events. Researchers have focused on identifying the factor(s) that can induce calcium oscillations during fertilization. Sperm‐specific phospholipase C, i.e., PLC zeta (PLCζ), is a strong candidate of the factor(s), and several research groups using different species obtained evidence that PLCζ is a sperm factor that can induce calcium oscillations during fertilization. However, postacrosomal sheath Tryptophan‐Tryptophan (WW)—domain‐binding protein (PAWP) was recently shown to have a pivotal role in inducing calcium oscillations in some species. In this review, we focus on PLCζ and PAWP as sperm factors, and we discuss this controversy: Which of these two molecules survives as a sperm factor?  相似文献   

Isolation of 1,796 SSR clones from SSR-enriched DNA libraries of bunching onion (Allium fistulosum)     

Hikaru Tsukazaki  Tsukasa Nunome  Hiroyuki Fukuoka  Hiroyuki Kanamori  Izumi Kono  Ken-ichiro Yamashita  Tadayuki Wako  Akio Kojima 《Euphytica》2007,157(1-2):83-94

Bunching onion (Allium fistulosum L.) is one of the most important vegetables in Japan. To establish a genetic basis for molecular breeding of bunching onion, we isolated 1,796 simple sequence repeat (SSR) clones by large-scale sequencing of SSR-enriched genomic DNA libraries. Of these, 1,331 (74.1%) contained (GT) _n repeats (n > 5), while 314 (17.5%) were (GA) _n -containing clones. The average number of SSR repeats was 10.5 and 10.4 in the (GT) _n - and (GA) _n -containing clones, respectively. In a sample of five bunching onion inbred lines, an average of 3.2 alleles were detected in the 100 SSR loci investigated, with the polymorphic information content averaging 0.55. These results indicate that bunching onion SSRs are very rich sources of highly informative genetic markers.  相似文献   

Acaricidal activity of components of Cryptomeria japonica against spider mites     

Yohei Yamashita  Naoya Hashimoto  Norihisa Kusumoto  Hiromi Saijo  Ikumi Goto  Hikaru Kobayashi  Yuka Kurihara  Koetsu Takahashi  Tatsuya Ashitani 《Journal of Wood Science》2015,61(1):60-64

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Forest soil and litter as filtering media for suspended sediment     

Yoichi Okura  Hikaru Kitahara  Toshiaki Sammori 《Journal of Forest Research》1997,2(1):9-14

A series of two filtration experiments were conducted to evaluate the filtration function of forest soil experimentally. The first experiment evaluated the differences between the filtration capabilities of the A₀ horizon and A horizon, and the effect of overstory species on the filtration function of the A₀ horizon. Undisturbed A₀, A and A₀+A horizons were collected for the filter mediums with cylindrical samplers. Leaves ofQuercus serrata, Quercus myrsinaeforia, Sasa senanensis Pinus densiflora, Chamaecyparis obtusa, andCryptomeria japonica were also packed in the samplers. Various suspended sediment concentration of water were sprayed at constant intensity on the surface of samples. Filtering coefficients were not affected by SS concentration in all samples, and the order of filtering coefficient was: A₀ horizons>A₀+A horizons>A horizons in undisturbed forest soil samples, andQuercus serrata>Sasa senanensis>Quercus myrsinaeforia>Pinus densiflora”Chamaecyparis obtusa>Cryptomeria, japonica in leaf samples. These results led to the conclusion that SS from managed forests can best be prevented by buffer zones where a thick A₀ horizon is maintained. The second experiment evaluated the effect of turbid water supply rate on the filtration capacity. Undisturbed A horizons and four leaf types,Quercus serrata, Pinus densiflora, Chamaecyparis obtusa, andCryptomeria japonica were used as filter mediums. Filtering coefficients were inversely proportional to supply rate of turbid water in all samples.  相似文献