Estimation of kelp forest, <Emphasis Type="Italic">Laminaria</Emphasis> spp., distributions in coastal waters of the Shiretoko Peninsula,Hokkaido, Japan,using echosounder and geostatistical analysis     

Kenji Minami  Hiroki Yasuma  Naoki Tojo  Shin-ichi Fukui  Yusuke Ito  Takahiro Nobetsu  Kazushi Miyashita 《Fisheries Science》2010,76(5):729-736

Sustainable management of the kelp forests of the Shiretoko Peninsula, a World Natural Heritage site, is necessary due to kelp’s ecological and economic importance. The objectives of this study were to estimate the area of kelp forests and to clarify their spatial characteristics in coastal waters of the Shiretoko Peninsula. Data on the presence/absence and thickness of kelp forests were collected via acoustic observation on transects over about 80 km using an echosounder at 200 kHz. Acoustic data were geostatistically interpolated, and the areas covered by kelp forests were estimated. Differences in kelp distribution between the eastern and western sides of the peninsula were compared. The total area of kelp forest was 3.88 km² (eastern area: 3.49 km²; western area: 0.39 km²). The range of thickness of the kelp forests was 34–91 cm. Many kelp forests in the eastern area were thick (>78 cm) and distributed continuously, while kelp forests in the western area were sparsely distributed.  相似文献   

Genetic variability and stock structure of red tilefish Branchiostegus japonicus inferred from mtDNA sequence analysis     

Kenji Nohara  Hiroyuki Takeuchi  Tatsuo Tsuzaki  Nobuaki Suzuki  Osamu Tominaga  Tadahisa Seikai 《Fisheries Science》2010,76(1):75-81

Sequence analysis based on the anterior part of the mitochondrial DNA control region was carried out to reveal the genetic diversity, stock structure, and historical demography of the red tilefish. Nucleotide sequences of 388 bp in length were determined for 280 individuals taken from eight localities. The molecular diversity, haplotype diversity, and nucleotide diversity were relatively high (average h = 0.929 ± 0.011; average π = 0.008 ± 0.005). The mismatch distribution was not significantly different from the expected distribution for a rapidly expanding population (P = 0.453). The minimum spanning network connecting with full-sequence haplotypes contained star-like topologies derived from multiple ancient lineages, supporting the mismatch distribution analysis. No significant genetic differentiation was observed among eight localities (maximum pairwise F _ST = 0.023, reduced-sequence data set). Our results suggest a large panmictic population of the red tilefish along the coast of Honshu to the East China Sea.  相似文献   

Effect of dietary fish oil on enhanced inflammation and disturbed lipophagy in white adipose tissue caused by a high fat diet     

Saitoh  Kanae  Yoshimura  Tomohiro  Sun  Luchuanyang  Yang  Min  Wang  Yao  Taniyama  Shigeto  Hara  Kenji  Murayama  Fumihito  Nikawa  Takeshi  Tachibana  Katsuyasu  Hirasaka  Katsuya 《Fisheries Science》2020,86(1):187-196

Fisheries Science - Fish oil containing omega-3 polyunsaturated fatty acids (PUFA) attenuates chronic inflammation found in obesity, leading to a reduction in insulin resistance. The effect of fish...  相似文献   

Selenoneine suppresses melanin synthesis by inhibiting tyrosinase in murine B16 melanoma cells and 3D-cultured human melanocytes     

Seko  Takuya  Imamura  Shintaro  Ishihara  Kenji  Yamashita  Yumiko  Yamashita  Michiaki 《Fisheries Science》2020,86(1):171-179

Fisheries Science - The novel organic selenium compound, selenoneine, is found in the blood of tuna and has metal-binding activity. In this report, selenoneine displays tyrosinase inhibitory...  相似文献   

Liquid-chromatographic hybrid triple–quadrupole linear-ion-trap MS/MS analysis of fatty-acid esters of dinophysistoxin-1 in bivalves and toxic dinoflagellates in Japan     

Suzuki  Toshiyuki  Kamiyama  Takashi  Okumura  Yutaka  Ishihara  Kenji  Matsushima  Ryoji  Kaneniwa  Masaki 《Fisheries Science》2009,75(4):1039-1048

Fatty-acid esters of dinophysistoxin-1 (DTX1) in scallops Patinopecten yessoensis, mussels Mytilus coruscus, and toxic dinoflagellate Dinophysis species, collected from Japanese seawater, were analyzed by liquid-chromatography mass spectrometry (LC–MS). Precursor ion monitoring, multiple reaction monitoring for 18 fatty-acid esters of DTX1, and full-scan MS/MS spectra obtained with a hybrid triple–quadrupole linear-ion-trap mass spectrometer showed that 14:0, 16:0, and 16:1 esters were the most abundant 7-O-acyl-DTX1 analogues in bivalves. Fatty-acids esters formed by conjugations at hydroxyl positions other than the 7-position of DTX1 were not detected in the bivalves. DTX1 and okadaic acid-16:0 fatty-acid esters have been reported as the most abundant ester in bivalves in several previous studies; however, we found that 7-O-16:1-DTX1 was the most abundant ester in some mussels in which 16:1 was more dominant than 16:0 in the free fatty-acid profile. Comparison between 7-O-acyl-DTX1 and free fatty-acid profiles in the same bivalve samples suggests that polyunsaturated fatty acids are selectively excluded in enzymatic acylation of DTX1. No 7-O-acyl-DTX1 was detected in any single-cell isolates of D. fortii, D. acuminata, D. mitra, D. norvegica, D. tripos, D. infundibulus, and D. rotundata.  相似文献   

Characteristics of a self-assembled fibrillar gel prepared from red stingray collagen     

Inwoo Bae  Kiyoshi Osatomi  Asami Yoshida  Atsuko Yamaguchi  Katsuyasu Tachibana  Tatsuya Oda  Kenji Hara 《Fisheries Science》2009,75(3):765-770

A translucent collagen gel was formed from a transparent acidic solution of red stingray collagen by adjusting to physiological ionic strength and pH in phosphate buffer and then incubating at 25–37°C. During fibril formation from red stingray collagen, the turbidity increased when the NaCl concentration was increased at constant pH and the rate of fibril formation was accelerated by higher pH or lower NaCl concentration. The T _m of red stingray collagen fibrillar gel was estimated as 44.3 ± 3.5°C, which was higher than that of the collagen solution, 33.2°C. In addition, red stingray collagen gel maintained its shape without melting and was suitable for culture of mouse stromal cells at 37°C.  相似文献   

Postoperative improvement of megaesophagus and esophageal motility in a 19-day-old puppy with gastroesophageal intussusception     

Ryo TAKEUCHI  Satoshi TAKAGI  Kenji HOSOYA  Hiroshi OHTA  Takaharu ITAMI  Masahiro OKUMURA 《The Journal of veterinary medical science / the Japanese Society of Veterinary Science》2021,83(11):1740

Canine gastroesophageal intussusception (GEI) is a rare and life-threatening condition that requires prompt diagnosis and treatment. A 19-day-old Siberian Husky with a 4-day history of regurgitation was diagnosed with GEI based on the findings of computed tomography (CT) performed without anesthesia. Endoscopic reduction of intussusception was impossible; thus, surgical reduction by traction of the duodenum was performed. CT revealed improvement of megaesophagus 82 days postoperatively. Eleven months postoperatively, fluoroscopy showed recovery to nearly normal esophageal motility. Two years postoperatively, no clinical signs were reported. CT is useful to diagnose GEI in neonate puppies with poor abdominal fat and to assess the gastric edema and the anatomical association of stomach with other organs. Fluoroscopy is helpful for evaluating postoperative esophageal motility.  相似文献   

Rice <Emphasis Type="Italic">terpene synthase 18</Emphasis> (<Emphasis Type="Italic">OsTPS18</Emphasis>) encodes a sesquiterpene synthase that produces an antibacterial (<Emphasis Type="Italic">E</Emphasis>)-nerolidol against a bacterial pathogen of rice     

Masaki Kiryu  Miho Hamanaka  Kayo Yoshitomi  Susumu Mochizuki  Kazuya Akimitsu  Kenji Gomi 《Journal of General Plant Pathology》2018,84(3):221-229

Plant volatile compounds, including terpenes, are known to be involved in the rice defense system. In the present analysis of a terpene synthase, OsTPS18, in rice, we found that OsTPS18 was localized in the cytoplasm and synthesized the sesquiterpenes (E)-nerolidol and (E)-β-farnesene. The amounts of (E)-nerolidol and (E)-β-farnesene increased after jasmonic acid (JA) treatment. (E)-Nerolidol had significant antibacterial activity against Xanthomonas oryzae pv. oryzae (Xoo). These results suggest that (E)-nerolidol plays an important role in JA-induced resistance against Xoo and that it functions as an antibacterial compound in rice.  相似文献   

Species and lineage identification for yellowfin <Emphasis Type="Italic">Thunnus albacares</Emphasis> and bigeye <Emphasis Type="Italic">T. obesus</Emphasis> tunas using two independent multiplex PCR assays     

Ryouichi Higashi  Kay Sakuma  Satoru N. Chiba  Nobuaki Suzuki  Seinen Chow  Yasuko Semba  Hiroaki Okamoto  Kenji Nohara 《Fisheries Science》2016,82(6):897-904

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Microperforated leaf blotting on polyvinylidene difluoride and nylon membranes to analyze spatial distribution of endogenous and viral gene expression in plant leaves     

Taiki Murakami  Ryou Tayama  Kenji S. Nakahara 《Journal of General Plant Pathology》2016,82(5):254-260

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