Larvicidal activity of Magnolia denudata seed hydrodistillate constituents and related compounds and liquid formulations towards two susceptible and two wild mosquito species          下载免费PDF全文

Zhang‐qian Wang  Haribalan Perumalsamy  Mo Wang  Shaohua Shu  Young‐Joon Ahn 《Pest management science》2016,72(5):897-906

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Rheological behavior of magnetic carbon nanotubes and their application as kevlar coating     

Tae Jin Kang  Kyung Hwa Hong  Byung Wook Ahn  Ho Yeun Kim 《Fibers and Polymers》2011,12(3):366-370

Carbon nanotube (CNT)/magnetite (Fe₃O₄) nanocomposites were successfully fabricated by nanocoating. When the CNT/Fe₃O₄ nanocomposites were added to a carbonyl (CI) based magnetorheological fluid (MRF), the magnetic rheological properties of the MRF were enhanced. Such enhancement in magnetic rheological properties of the CI-CNT/Fe₃O₄ MRF is considered to be attributable to both the superparamagnetic property of the magnetic layer covering the CNT surface and the high length to diameter ratio of the CNT/Fe₃O₄ nanocomposite. Impact properties for CI-CNT/Fe₃O₄ MRF treated Kevlar fabrics were also tested, and improved impact properties were observed with external magnetic fields compared to CI-MRF treated Kevlar fabrics.  相似文献   

Study of Photo and Thermoluminescence Properties to Identify Irradiated Dried-Fishery Products     

Moon-Young Kim  Jae-Jun Ahn  Kashif Akram  Gui-Ran Kim  Mi-Seon Jeong  Ji-Young Kwak 《Journal Of Aquatic Food Product Technology》2013,22(3):299-306

ABSTRACT

Radiation-specific luminescence properties in irradiated dried-fishery products (pollack, little pollack, clams, and shrimp) were investigated at different dose levels (0–10 kGy). Photostimulated luminescence (PSL) analysis of whole samples was effective for dried clams and shrimp, while low PSL sensitivity was observed in dried pollack and little pollack. Thermoluminescence (TL) analysis was conducted after isolation of silicate minerals, in which the two methods of mineral isolation—density separation and acid hydrolysis—were compared. Irradiated samples were easily distinguishable through the strong TL glow curves, with maximum peaks in temperature range of 150–250°C. TL ratios (TL₁/TL₂) were < 0.1 for nonirradiated samples, while > 0.1 for irradiated. There was a clear effect of applied irradiation dose, with a negligible effect of the method used for mineral separation. The mineral composition showed that feldspar and quartz minerals were mainly responsible for the well-characterized luminescence behavior upon irradiation.  相似文献   

Nutritional Properties of Various Tissues from New Kenaf Cultivars     

Dong-Gun Kim  Jaihyunk Ryu  Min-Kyu Lee  Jung Min Kim  Joon-Woo Ahn  Jin-Baek Kim  Si-Yong Kang  Chang-Hyu Bae  Soon-Jae Kwon 《Journal of Crop Science and Biotechnology》2018,21(3):229-239

Kenaf is an economically important crop that contains various functional compounds. The objective of this study was to evaluate the nutritional properties of leaves, stem bark, flowers, and seeds collected from three mutant kenaf cultivars (Jangdae, Baekma, and Jeokbong) and two original cultivars (Jinju and C14). For all analyzed tissues, there were no significant differences in the proximate compositions (moisture, crude protein, crude fiber, crude fat, ash, and nitrogen-free extract) among the tested genotypes, except for the leaf crude protein content, which was highest in Jinju plants. Of the tested minerals, potassium and calcium were the most abundant in all tissues. Additionally, we detected significant differences in the mineral contents (e.g., calcium, phosphorus, potassium, magnesium, zinc, and iron) of various tissues in all cultivars. Proline and phenylalanine were the major amino acids detected in leaves, and the highest total amino acid (TAA) and essential amino acid (EAA) contents were observed in Jinju plants. The TAA and EAA contents were lower in stem bark than in the other tissues, except in Baekma plants, in which the lowest levels were observed in flowers. Moreover, the TAA and EAA contents were approximately 20 times lower in white flowers (Baekma) than in ivory flowers. Furthermore, the highest TAA and EAA concentrations were observed in Jangdae seeds. These results may be useful for identifying the optimal cultivar and tissues for use in food products.  相似文献   

Effects of road transportation on metabolic and immunological responses in Holstein heifers          下载免费PDF全文

Hyeok‐Joong Kang  In Kyu Lee  Min‐Yu Piao  Chae‐Won Kwak  Min Jeong Gu  Cheol Heui Yun  Hyun‐Jin Kim  Hyeon‐Ju Ahn  Hee‐Bal Kim  Gyeom‐Heon Kim  Soo‐Ki Kim  Jong‐Youl Ko  Jong K. Ha  Myunggi Baik 《Animal Science Journal》2017,88(1):140-148

This study examined the effects of road transportation on metabolic and immunological responses in dairy heifers. Twenty Holstein heifers in early pregnancy were divided into non‐transported (NT; n = 7) and transported (T; n = 13) groups. Blood was collected before transportation (BT), immediately after transportation for 100 km (T1) and 200 km (T2), and 24 h after transportation (AT). The T heifers had higher (P < 0.05) blood cortisol and non‐esterified fatty acid concentrations after T1 and T2 than did NT heifers. By contrast, the T heifers had lower (P < 0.05) serum triglyceride concentrations after T1 and T2 than had the NT heifers. The serum cortisol and triglyceride concentrations returned (P > 0.05) to the BT concentrations at 24 h AT in the T heifers. The granulocyte‐to‐lymphocyte ratio and the percentage of monocytes were higher (P < 0.05) after T2 in the T heifers than in the NT heifers, suggesting that transportation stress increased the numbers of innate immune cells. T heifers had higher (P < 0.01) plasma haptoglobin concentrations than NT heifers 24 h AT. In conclusion, transportation increased cortisol secretion and was correlated with increased metabolic responses and up‐regulation of peripheral innate immune cells in dairy heifers.  相似文献   

Rose (Rosa hybrida L.) EST-derived microsatellite markers and their transferability to strawberry (Fragaria spp.)     

Young Hoon Park  Seong Gyu Ahn  Young Mi Choi  Hye Jeong Oh  Dong Chun Ahn  Jin Gi Kim  Jum Soon Kang  Young Whan Choi  Byoung Ryong Jeong 《Scientia Horticulturae》2010

The ‘Genome database for Rosaceae (GDR)’ provides a large collection of expressed sequence tags (ESTs) harboring simple sequence repeats (SSRs) from several Rosaceae genera, including Rosa (rose). Primer pairs flanking SSR were designed for 312 unique Rosa ESTs based on GDR database. Eight rose (Rosa hybrida L.) genotypes were tested for PCR amplification, and 287 (92%) of the primer pairs generated allele-specific PCR bands that were readily scored. From 183 (63.7%) primer pairs that evidenced polymorphic alleles among the eight rose cultivars, 20 pairs evidencing EST sequence homology to known gene functions and high levels of polymorphism were selected and utilized for DNA fingerprinting and genetic diversity assessments of 47 rose hybrids. A total of 202 polymorphic bands were scored and generated unique fingerprints for each rose hybrid. The Nei–Li genetic similarity coefficients among 1081 pair-wise comparisons of 47 cultivars exhibited a broad range of genetic variations from 0.30 (‘Grand King’ and ‘Carnival’) to 0.99 (‘First Red’ and ‘Red Champ’). UPGMA cluster analysis divided 47 hybrids into five major groups and two sub-groups. The cross-species transferability of 273 EST-SSR primer pairs was evaluated using four genotypes of the strawberry, a genus member of the Rosaceae family. PCRs on the DNA samples of strawberry were successful for 165 primer pairs; among these, 123 pairs amplified 243 polymorphic bands. As surrogates of the marker transfer, the phenetic relationship among the four strawberry genotypes was evaluated. Genetic similarity coefficients varied from 0.78 (‘Maehyang’ and ‘Janghyee’) to 0.64 (‘Janghyee’ and ‘Pragana’). The results of cluster analysis showed that the three octaploid strawberry cultivars were quite similar, whereas the diploid ‘Pragana’ was related distantly at the genomic DNA level. The EST-SSR markers developed in the present study can be efficiently utilized for genetic diversity studies in Rosaceae.  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   

Compressional behavior of carbon nanotube reinforced mesophase pitch-based carbon fibers     

Young Rack Ahn  Young Seak Lee  A. A. Ogale  Chang Hun Yun  Chong Rae Park 《Fibers and Polymers》2006,7(1):85-87

The tensile-recoil compressional behavior of the carbon nanotube reinforced mesophase pitch (MP)-based composite carbon fibers (CNT-re-MP CFs) was investigated by using Instron and SEM. The CNT-re-MP CFs exhibited improved, or at least equivalent, compressive strength as compared with commercial MP-based carbon fibers. Particularly, when CNT of 0.1 wt% was reinforced, the ratios of recoil compressive strengths to tensile strength of CNT-re-MPCFs were much higher (the difference is at least 10% or higher) than those for the commercial counterparts and even than those for PAN-based commercial carbon fibers. FESEM micrographs showed somewhat different fractography from that of a typical shear failure as the CNT content increased.  相似文献   

Basosquamous carcinoma with systemic metastasis in a miniature Pinscher     

Shin SK  Kim TW  Youm SY  Kim G  Na KJ  Chang D  Ahn B 《The Japanese journal of veterinary research》2011,59(4):173-179

Basosquamous carcinoma (BSCC) is a rare malignancy, primarily composed of basal cells with foci of squamous differentiation. It is considered to be histologically an intermediate type between basal cell carcinoma and squamous cell carcinoma, and is known to have aggressive behaviors. BSCC occurred in a 17-year-old female minipin with a history of surgical excision for a mammary tumor. The right upper hindlimb was severely enlarged to 8 x 5 cm. Cross-section showed a homogenous white to yellow-white mass compressing the surrounding muscular tissues. The tumor metastasized also to the lungs, heart, abdominal cavity, liver and salivary gland. Microscopically, basaloid cells were crowded into solid nests or lobules separated by well-developed fibrous tissues with occasional keratinizations. Since there was no skin lesions, the tumor is assumed to be originated from the formerly present tumor in mammary gland. To our literature review, this case is the first BSCC with systemic metastasis in a dog.  相似文献   

Consumption of oxidized oil increases oxidative stress in broilers and affects the quality of breast meat     

Zhang W  Xiao S  Lee EJ  Ahn DU 《Journal of agricultural and food chemistry》2011,59(3):969-974

A total of 120 4-week-old broiler chickens were allotted to 12 pens and fed one of three diets including control, oxidized diet (5% oxidized oil), or antioxidant-added diet (500 IU vitamin E) for 2 weeks. Blood samples were collected at the end of feeding trial, and breast muscles were sampled immediately after slaughter. Breast meats were also collected 24 h after slaughter and used for meat quality measurements. Oxidative stress in blood, lipid and protein oxidation, and sarcoplasmic reticulum Ca2(+)-ATPase (SERCA) activity of breast muscle were determined. The oxidized diet increased oxidative stress in blood and increased carbonyl content in breast meat compared with the other two dietary treatments (P < 0.05). Lipid oxidation of breast muscles with the antioxidant-supplemented diet was lower than that with the oxidized and control diet groups (P < 0.05). Meat from birds fed the oxidized diet showed higher drip loss after 1 and 3 days of storage and greater 0-1 h post-mortem pH decline (P < 0.05). Significant differences in specific SERCA activity in breast muscles from birds fed control and oxidized diets (P < 0.05) were detected. This suggested that dietary oxidized oil induced oxidative stress in live birds and increased lipid and protein oxidation in breast muscle. Decrease in SERCA activity in breast muscles due to oxidative stress in live animals accelerated post-mortem glycolysis, which sped the pH drop after slaughter and increased drip loss, indicating that oxidation of diet can cause PSE-like (pale, soft, and exudative) conditions in broiler breast muscles.  相似文献