Relationship between coastal water properties and adult return of chum salmon (Oncorhynchus keta) along the Sanriku coast,Japan          下载免费PDF全文

Taku Wagawa  Hiroshi Kuroda  Shin‐Ichi Ito  Shigeho Kakehi  Takeshi Yamanome  Takuya Kodama 《Fisheries Oceanography》2016,25(6):598-609

We investigated the relationship between adult (age‐4) return rates for chum salmon (Oncorhynchus keta) originating from the Iwate Prefecture, Japan, and coastal environmental conditions during their early ocean life in coastal residency. We analyzed distributions of water properties via intensive hydrographic observations using a conductivity–temperature–depth profiler. Both the return rates and water properties vary strongly over interannual time scales. We found that the time when the return rate decreased drastically corresponded well to the time when the frequency of warm waters in the coastal residency increased.  相似文献   

Arsenic accumulation by rice grown in soil treated with roxarsone     

Chen‐Wuing Liu  Ching‐Chieh Lin  Cheng‐Shin Jang  Guey‐Rong Sheu  Lo Tsui 《植物养料与土壤学杂志》2009,172(4):550-556

Poultry litter is widely used as a fertilizer for lowland rice in Taiwan and China. However, the organic‐arsenic compound roxarsone (additive of poultry feed) in poultry litter can be absorbed by the plants and the resulting arsenic (As) contamination may pose a serious threat to human health. This study used various amounts of poultry litter contaminated with roxarsone in pot experiments to evaluate the effect of roxarsone on rice agronomic parameters and the bioaccumulation of total and inorganic As in rice‐plant tissues. Rice‐grain yield decreased significantly with increasing As content of the soil, and the critical threshold that killed rice was 200 mg roxarsone (kg soil)^–1. The As concentrations in root, straw, leaf, husk, and grain increased with increasing soil As (p < 1%). At 100 mg roxarsone per kg of soil, the As concentration in the rice grain exceeded the statutory permissible limit of 1.0 mg As (kg dry weight)^–1 and at 25 mg roxarsone (kg soil)^–1, the inorganic As concentrations in grains exceeded the statutory limit of 0.15 mg of inorganic As kg^–1 in China. For all treatments, the As concentrations in various plant tissues at maturity follow the order: root > stem > leaf > husk > grain. Arsenite was the predominant species in root, straw, and grain, while arsenate was the predominant species in leaf and husk. No significant difference existed between the amounts of arsenite and arsenate when various amounts of poultry litter were applied. This result illustrates that large amounts of added roxarsone are not only toxic to rice but also accumulate in grains in the inorganic As forms, potentially posing a threat to human health via the food chain.  相似文献   

Effect of different planting times on the quantitative variation of total seed isoflavone content and composition in Korean soybean cultivars (Glycine max (L.) Merr.)     

Kim  Hong-Sik  Kang  Beom-Kyu  Seo  Jeong-Hyun  Kim  Hyun-Tae  Ha  Tae-Joung  Oh  Jae-Hyeon  Shin  Sang-Ouk  Baek  In-Yeol 《Journal of Crop Science and Biotechnology》2021,24(2):179-190

Journal of Crop Science and Biotechnology - There is great interest in the enhancement of isoflavones as one of the functional ingredients in soybean. This study aimed to investigate the effects of...  相似文献   

Panax ginseng extract rich in ginsenoside protopanaxatriol attenuates blood pressure elevation in spontaneously hypertensive rats by affecting the Akt-dependent phosphorylation of endothelial nitric oxide synthase     

Hong SY  Kim JY  Ahn HY  Shin JH  Kwon O 《Journal of agricultural and food chemistry》2012,60(12):3086-3091

Nitric oxide (NO) produced by endothelial nitric oxide synthase (eNOS) is a fundamental regulator of systemic blood pressure. Ginsenosides from Panax ginseng have been investigated in vitro for the molecular and biochemical mechanisms by which they stimulate NO release in vascular endothelial cells; however, little research has been done to confirm the physiological relevance of these in vitro studies. To address this research gap, the effects of a P. ginseng extract rich in ginsenosides from protopanaxatriol on spontaneously hypertensive rats (SHRs) was examined. Ginseng extract administration stimulated nongenomic Akt-mediated eNOS activation, enhanced NO production, improved vessel wall thickening, and alleviated hypertension in SHRs, confirming the physiological relevance of previous in vitro studies with ginsenosides.  相似文献   

Proteomic identification of a novel toxin protein (Txp40) from Xenorhabdus nematophila and its insecticidal activity against larvae of Plutella xylostella     

Park JM  Kim M  Min J  Lee SM  Shin KS  Oh SD  Oh SJ  Kim YH 《Journal of agricultural and food chemistry》2012,60(16):4053-4059

For the identification of a novel insecticidal protein, a two-dimensional liquid chromatography (PF-2D) system was used in a quantitative proteomic analysis of Xenorhabdus nematophila CBNU strain isolated from entomophagous nematode Steinernema carpocapsae . Protein patterns obtained from minimum and maximum insecticidal activities during cultivation were contrasted, and a novel toxin protein (Txp40) was identified by MALDI-TOF/MS. The DNA sequence of the cloned toxin gene (1089 bp) has an open reading frame encoding 363 amino acids with a predicted molecular mass of 41162 Da. The txp40 identified in this study is most closely related to the known txp40 cloned from X. nematophila EB (ADQ92844) with 94.4% identical sequence residues. Following the expression of the newly identified toxin gene in Escherichia coli , the insecticidal activity of the recombinant toxin protein was determined against Plutella xylostella larvae; a 56.7% mortality rate was observed within 24 h.  相似文献   

Anti-inflammatory Activities of an Ethanol Extract of Ecklonia stolonifera in Lipopolysaccharide-Stimulated RAW 264.7 Murine Macrophage Cells     

MS Lee  MS Kwon  JW Choi  T Shin  HK No  JS Choi  DS Byun  JI Kim  HR Kim 《Journal of agricultural and food chemistry》2012,60(36):9120-9129

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Numerical simulation study of a tree windbreak   总被引：2，自引：0，他引：2  

Jessie P. Bitog  In-Bok Lee  Hyun-Seob HwangMyeong-Ho Shin  Se-Woon HongIl-Hwan Seo  Kyeong-Seok KwonEhab Mostafa  Zhenzhen Pang 《Biosystems Engineering》2012,111(1):40-48

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Preparation of regenerated cellulose fiber via carbonation. I. Carbonation and dissolution in an aqueous NaOH solution     

Sang?Youn?Oh  Dong?Il?YooEmail author  Younsook?Shin  Wha?Seop?Lee  Seong?Mu?Jo 《Fibers and Polymers》2002,3(1):1-7

Cellulose carbonate was prepared by the reaction of cellulose pulp and CO₂ with treatment reagents, such as aqueous ZnCl₂ (20–40 wt%) solution, acetone or ethyl acetate, at −5–0°C and 30–40 bar (CO₂) for 2 hr. Among the treatment reagents, ethyl acetate was the most effective. Cellulose carbonate was dissolved in 10% sodium hydroxide solution containing zinc oxide up to 3 wt% at −5–0°C. Intrinsic viscosities of raw cellulose and cellulose carbonate were measured with an Ubbelohde viscometer using 0.5 M cupriethylenediamine hydroxide (cuen) as a solvent at 20°C according to ASTM D1795 method. The molecular weight of cellulose was rarely changed by carbonation. Solubility of cellulose carbonate was tested by optical microscopic observation, UV absorbance and viscosity measurement. Phase diagram of cellulose carbonate was obtained by combining the results of solubility evaluation. Maximum concentration of cellulose carbonate for soluble zone was increased with increasing zinc oxide content. Cellulose carbonate solution in good soluble zone was transparent and showed the lowest absorbance and the highest viscosity. The cellulose carbonate and its solution were stable in refrigerator (−5°C and atmospheric pressure).  相似文献   

Differential effects of treadmill exercise on calretinin immunoreactivity in type 2 diabetic rats in early and chronic diabetic stages     

Nam SM  Hwang IK  Yi SS  Yoo KY  Park OK  Yan B  Song W  Won MH  Yoon YS  Seong JK 《The Journal of veterinary medical science / the Japanese Society of Veterinary Science》2011,73(8):1037-1042

In this study, we investigated the effects of treadmill exercise on calretinin (CR), a marker of early postmitotic neurons, immunoreactivity in the dentate gyrus (DG) of Zucker diabetic fatty (ZDF) rats, before or after diabetes onset, and Zucker lean control (ZLC) rats. For this study, 6-week-old ZLC and prediabetic ZDF rats, and 22-week-old ZLC and ZDF rats were exercised on the treadmill. Sedentary ZLC and ZDF rats of the same age were used as exercise experiment controls. The exercised prediabetic ZDF rats did not show diabetes onset, while the sedentary prediabetic ZDF rats showed significantly increased blood glucose levels. The exercised diabetic ZDF rats exhibited a decrease in their blood glucose levels compared to the sedentary diabetic ZDF rats, but the levels were still above 20 mmol/l. ZLC rats of both ages were in the normoglycemic range. CR immunoreactivity was detected throughout the DG, including the subgranular zone and the polymorphic layer. Diabetic rats exhibited a significant decrease in the number of CR-immunoreactive cells and fibers in the DG. Exercise in the prediabetic ZDF rats significantly increased the number of CR-immunoreactive cells and fibers in the subgranular zone of the DG. In the ZLC and ZDF rats of chronic diabetic phase, exercise increased CR-immunoreactive neurons in the hilar region. These results suggest that diabetes significantly reduces the number of postmitotic CR-immunoreactive neurons and the intensity of immunoreactivity and that exercise increases these CR-related parameters in a diabetic stage-dependent manner.  相似文献   

Molecular epidemiology of rabies virus circulating in South Korea, 1998-2010     

Yang DK  Shin EK  Oh YI  Kang HK  Lee KW  Cho SD  Song JY 《The Journal of veterinary medical science / the Japanese Society of Veterinary Science》2011,73(8):1077-1082

We analyzed the nucleotide sequences of the G-L (glycoprotein-large protein) intergenic non-coding region of 33 strains of the rabies virus (RABV) isolated in South Korea in 1998-2010 and compared the sequences with those of previously reported non-Korean strains. The similarities of the nucleotide sequences of the G-L region among all Korean RABV isolates ranged from 97.1 to 100%. Based on the phylogenetic analysis of the G-L region, the Korean RABV isolates were classified into three distinct subgroups with high similarity and were most closely related to the non-Korean NeiMeng1025C isolate, which was isolated from a rabid raccoon dog in eastern China, suggesting that the Korean RABV isolates originate from a rabid raccoon dog in northeastern Asia. Our results indicated that G-L region, as a useful phylogenetic indicator, is equivalent to the nucleoprotein (N) or glycoprotein (G) gene for study of RABV molecular epidemiology and that the Korean RABV isolates showing a few substitutions in the G-L region are continuously circulating in South Korea.  相似文献