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排序方式: 共有126条查询结果,搜索用时 15 毫秒
91.
In this study, electrospun wool keratose (WK)/silk fibroin (SF) blend nanofiber was prepared and evaluated as a heavy metal
ion adsorbent which can be used in water purification field. The WK, which was a soluble fraction of oxidized wool keratin
fiber, was blended with SF in formic acid. The electrospinnability was greatly improved with an increase of SF content. The
structure and properties of WK/SF blend nanofibers were investigated by SEM, FTIR, DMTA and tensile test. Among various WK/SF
blend ratios, 50/50 blend nanofiber showed an excellent mechanical property. It might be due to some physical interaction
between SF and WK molecules although FTIR result did not show any evidence of molecular miscibility. As a result of metal
ion adsorption test, WK/SF blend nanofiber mats exhibited high Cu2+ adsorption capacity compared with ordinary wool sliver at pH 8.5. It might be due to large specific surface area of nanofiber
mat as well as numerous functional groups of WK. Consequently, the WK/SF blend nanofiber mats can be a promising candidate
as metal ion adsorption filter. 相似文献
92.
Sundan Suresh Jong-Wook Chung Jung-Sook Sung Gyu-Taek Cho Jong-Hyun Park Mun Sup Yoon Chung-Kon Kim Hyung-Jin Baek 《Genetic Resources and Crop Evolution》2013,60(3):893-903
Dill (Anethum graveolens L.) leaf, seed and their essential oil are rich source of antioxidants. The plant is native in Southwest Asia and is cultivated in Europe, India and the United States. This study evaluated the genetic diversity structure of 135 accessions of A. graveolens from different continents, based on random amplified polymorphic DNA (RAPD) markers. The selected 10 RAPD primers generated a total of 142 highly reproducible bands, among which 89 were polymorphic. Percentage of polymorphism varied from 41.17 % (OPB20) to 92.85 % (OPB15) with an average of 77.74 %. A relatively high genetic diversity was detected among all the accessions with the Nei’s genetic diversity (H) values ranged from 0.346 (OPB07) to 0.444 (OPB18) with a mean of 0.401. When estimated for Shannon’s information index (I), it has ranged from 0.530 (OPB12) to 0.652 (OPB18), the mean was observed as 0.581. The respective values of H and I were found to be the highest value for primer OPB18. Cluster analysis of RAPD data using UPGMA algorithm based on Nei’s genetic similarity matrix placed the 135 accessions into two main clusters. Although a number of groups can be identified, the clusters show little to no association with the geographic origin of the material. The implication of the results of this study in developing a strategy for the conservation and breeding of dill germplasm are discussed. 相似文献
93.
C.B. Park B.H. Kim O.S. Na Y.B. Song C.H. Lee Y.D. Lee H.J. Baek H.B. Kim 《Fish physiology and biochemistry》2003,28(1-4):441-442
The in vitro effects of bisphenol-A (BPA), nonylphenol (NP) and 4-tert-octylphenol (OP) on vitellogenin (VTG) synthesis were examined using primary cultures of Chinese minnow, Rhynchocypris oxycephalus hepatocytes. In vitro VTG syntheses were induced by exposure to 10?5 M of BPA and 10?4 M of both NP and OP, suggesting that BPA had the highest estrogenic potential among the three phenols. 相似文献
94.
Yun Sun Lee Hye Mi Park Sang Un Park Jin Hong Baek Tae-Jin Yang 《Journal of Crop Science and Biotechnology》2013,16(4):285-290
We established an advanced protocol for in vitro propagation of Aloe vera via comparison of basal media, sucrose contents, growth hormone combinations, and additional supplementation with various polyamines. The maximal number and growth of shoots after 5 weeks was obtained using MS media including 30 g L?1 sucrose supplemented with 1.0 mg L?1 BA and 0.1 mg L?1 NAA. To improve shoot production, various concentrations of putrescine, spermidine, and spermine were added under optimal growth hormone conditions (MS media supplemented with 30 g L?1 sucrose, 1.0 mg L?1 BA, and 0.1 mg L?1 NAA). Maximal shoot number and growth after 5 weeks were achieved with supplementation of 50 mg L?1 spermidine. Regenerated plants were successfully acclimatized in soil with 100% efficiency. Cytogenetic inspection revealed that the regenerated plants maintained intact chromosomes identical to those of plants grown in field conditions. This protocol provides a valuable alternative for mass production of elite Aloe vera. 相似文献
95.
Baek BK Islam MK Kim BS Lim CW Hur J Oluoch AO Kim CH Kakoma I 《Veterinary parasitology》2003,113(3-4):217-227
The protective response in rats against a homologous challenge infection with Strongyloides venezuelensis was characterized. In an initial infection with 1000 filariform larvae and migrating larvae (L(3)) of S. venezuelensis, the population of L(3) in the lungs on day 3 postinfection (PI), and that of adult worms in the small intestine on day 7 PI, were 180.8+/-14.5 and 336.8+/-70.7, respectively. The latter were gradually expelled towards day 42 PI. After the initial infection, the rats developed strong immunity against a homologous challenge infection as manifested by a marked reduction in worm populations, stunted body length and width, damage to reproductive organs, impaired egg production and rapid expulsion of the worms by day 14 after challenge. Expulsion of the worms was preceded by a significantly elevated (P<0.05) peripheral blood eosinophil (PBE) count, both in the initial (200.0+/-26.5 x 10(3)ml) and the challenge infection (400.9+/-165.4 x 10(3)ml). These findings suggest that rats acquire strong homologous immunity following initial exposure to S. venezuelensis. It is suggested that PBEs are involved in worm expulsion. A major target of these effector mechanisms is the reproductive system of S. venezuelensis. 相似文献
96.
Kim DJ Park JH Seok SH Cho SA Baek MW Lee HY Park JH 《The Journal of veterinary medical science / the Japanese Society of Veterinary Science》2005,67(1):119-120
Epitheliocystis in the carp of a pet fish market were investigated by our diagnostic work and collecting information from department of laboratory animal medicine and fish & shellfish laboratory. The epitheliocystis was identified by using histopathological examination. Epitheliocystis was confirmed as inflammation, epithelial hyperplasia, and lamellar fusion of the gill tissue. Electron microscopic observation showed that the inclusions were filled with Chlamydia-like organism. 相似文献
97.
Kiku Matsuda Byeong-Kirl Baek Chae-Woong Lim 《Journal of zoo and wildlife medicine》2003,34(2):200-201
A mature male and a mature female Dirofilaria immitis were found in the right ventricle of the heart of a naturally infected 2-yr-old male Eurasian otter (Lutra lutra) that had died of severe lung congestion at a zoo in South Korea. Both developing embryos and microfilariae were present in the uterus of the female D. immitis. Although circulating microfilariae were not detected in blood or tissue, the Eurasian otter may serve as a definitive host for D. immitis. 相似文献
98.
Evaluation of the Sprague-Dawley rat as a model for vertical transmission of Brucella abortus 下载免费PDF全文
Byeong K. Baek Bou O. Lee Jin Hur M.S. Rahman Sung I. Lee Ibulaimu Kakoma 《Canadian journal of veterinary research》2005,69(4):305-308
Vertical transmission of Brucella abortus in Sprague-Dawley (SD) rats was verified with microbiologic, serologic, and polymerase chain reaction (PCR) methods. The 38 initially Brucella-free SD rats, weighing 200 to 250 g, were injected subcutaneously with 50 microL of a suspension containing 1 x 10(9) colony-forming units (cfu) of B. abortus biotype 1 Korean isolate. The rats were allowed to mate with uninfected SD rats. The isolate was detected by culture and by AMOS (abortus, melitensis, ovis, suis) PCR in testis tissue of infected male rats and splenic tissue of infected female rats. By 7 d after inoculation, the results of both the rose bengal test (RBT) and the plate agglutination test (PAT) were positive for antibody against B. abortus; the reciprocal antibody titre ranged from 200 to 400 in the 1-mo-old offspring and 800 in their dams. The infected rats directly transmitted Brucella to their breeding partners and offspring. Fetuses of infected dams were found to be infected at 20 d of gestation. These data are discussed in relation to a model for epizootic and zoonotic cases possibly involving wild animals. Additional rigorous experiments are warranted to explore the value of this model in developing measures to prevent congenital brucellosis. 相似文献
99.
100.
Jaeyeob Jeong Chang Gyu Jo Gyeong Won Baek Jae-Hyun Park Ho-Seop Ma Byung Oh Yoo 《Journal of Sustainable Forestry》2017,36(3):289-303
The aim of this study was to evaluate the response of soil amendment applications on soil and the foliage nutrient status of a Japanese cypress (Chamaecyparis obtusa Endlicher) plantation established following clear-cutting in a pine-wilt-disease (PWD)-disturbed forest. We established four soil amendment treatments [(compound fertilizer (CF), compound fertilizer + biochar (CFB), compound fertilizer + sawdust (CFS) and a non-treated control treatment] in an 8-year-old Japanese cypress plantation. Soil organic carbon (C) and total nitrogen (N) were not significantly different (P > 0.05) between the soil amendment treatments and the control treatments, whereas extractable phosphorus (P), NH4+, K+, and Mg2+ concentrations were significantly affected by the addition of biochar in CF. The mean soil CO2 efflux rates during the study period were the highest in CFB (0.79 g CO2 m?2 h?1), followed by CFS (0.71 g CO2 m?2 h?1), CF (0.62 g CO2 m?2 h?1), and the control (0.46 g CO2 m?2 h?1) treatments. Foliar N and P concentrations were significantly higher in the CFB than in the control treatments. The results suggest that the addition of biochar in CF can enhance extractable soil nutrients and foliar N and P conditions of Japanese cypress established in a PWD-disturbed forest. 相似文献