Preparation and characterization of carboxymethyl cellulose nonwovens by a wet-laid process     

Min Ji Yoon  Song Jun Doh  Jung Nam Im 《Fibers and Polymers》2011,12(2):247-251

In this study, micro-porous carboxymethyl cellulose (CMC) nonwovens were prepared by carboxymethylation of cellulose nonwovens produced by a wet-laid process and their properties were investigated for potential applications as adhesion prevention barriers. After carboxymethylation, the thickness and mean pore size of the cellulose nonwovens were increased, whereas their pore size distribution became narrower. Tensile strength of cellulose nonwovens was proportional to basis weight, and dramatically increased after carboxymethylation. CMC nonwovens immediately absorbed a phosphate buffered saline solution and showed swollen phase within 1 min. It was found that the thickness and pore size distribution of CMC nonwovens could be easily controlled by the wet-laid process. It is expected that the CMC nonwovens can be used as adhesion prevention barriers.  相似文献   

Multiple segmented reaches per subwatershed modeling approach for improving HSPF-Paddy water quality simulation   总被引：2，自引：0，他引：2  

Ji-Hong Jeon  Kyoung Jae Lim  Chun G. Yoon  Bernard A. Engel 《Paddy and Water Environment》2011,9(2):193-205

Reach segmentation influences predicted water quality concentrations in water quality modeling. Many lumped or semi-distributed watershed models, including Soil and Water Assessment Tool (SWAT) and Hydrologic Simulation Program-Fortran (HSPF), simulate stream/river water quality with a single segmented reach per subwatershed (SSRS) modeling approach. A multiple-segmented reaches per subwatershed (MSRS) modeling approach was developed, and simulated BOD₅ concentrations for this approach were compared with results from the SSRS modeling approach using the HSPF-Paddy model. The SSRS modeling approach has potential systemic errors for predicting BOD₅ concentration even when the model is well calibrated. When the point source was loaded at the most upstream location with the same decay rate, the predicted BOD₅ concentration using the SSRS modeling approach was higher compared with results for the MSRS modeling approach, and the difference between two methods increases with increasing load and decay rate. When BOD₅ was loaded more downstream, BOD₅ concentration using the SSRS modeling approach was lower compared with results for MSRS modeling. For a case study, simulated streamflow and BOD₅ concentration for the SSRS and MSRS modeling approaches demonstrated good agreement with observed data. However, the estimated decay rate for the SSRS modeling approach was smaller than that for the MSRS modeling approach because BOD decays through total volume in the SSRS modeling approach, although BOD may be loaded anywhere in the reach. The MSRS modeling approach can minimize systematic errors and provide more detailed variation of water quality concentrations along a river length. The MSRS modeling approach does not always need to be applied to all subwatersheds but is recommended for reaches significantly polluted by point source pollution.  相似文献   

Methyl jasmonate alleviated salinity stress in soybean   总被引：1，自引：0，他引：1  

Ji Young Yoon  Muhammad Hamayun  Su-Kyung Lee  In-Jung Lee 《Journal of Crop Science and Biotechnology》2009,12(2):63-68

We studied the role of methyl jasmonate (MeJA) in alleviating NaCl-induced salt stress on soybean growth and development in hydroponics medium. Soybean seedlings were exposed to 60 mM NaCl stress for 2 weeks, 24 h after the application of 20 and 30 μM MeJA. NaCl stress induced a significant reduction in plant growth, endogenous bioactive gibberellin (GA4), photosynthesis and transpiration rate, while a marked increase in the endogenous abscisic acid (ABA) and proline contents were recorded. MeJA application greatly mitigated the adverse effects of NaCl on soybean growth and endogenous hormones. MeJA significantly increased ABA levels, while the endogenous amount of GA4 was reduced by the application of NaCl. Our study revealed that MeJA counteracted the negative effects of NaCl stress on plant growth, chlorophyll content, leaf photosynthetic rate, leaf transpiration rate, and proline content.  相似文献   

Physical and Sensory Properties of Regular and Reduced‐Fat Pound Cakes with Added Amaranth Flour     

Vanessa Dias Capriles  Eveline Lopes Almeida  Reinaldo Eduardo Ferreira  Jos Alfredo Gomes Arêas  Caroline Joy Steel  Yoon Kil Chang 《Cereal Chemistry》2008,85(5):614-618

The sum of wheat flour and corn starch was replaced by 10, 20, or 30% whole amaranth flour in both conventional (C) and reduced fat (RF) pound cakes, and the effects on physical and sensory properties of the cakes were investigated. RF presented 33% fat reduction. The increasing amaranth levels darkened crust and crumb of cakes, which decreased color acceptability. Fresh amaranth‐containing cakes had similar texture characteristics to the controls, evaluated both instrumentally and sensorially. Sensory evaluation revealed that replacement by 30% amaranth flour decreased C cakes overall acceptability scores, due to its lower specific volume and darker color. Amaranth flour levels had no significant effect on overall acceptability of RF cakes. Hence, the sum of wheat flour and corn starch could be successfully replaced by up to 20% amaranth flour in C and up to 30% in RF pound cakes without negatively affecting sensory quality in fresh cakes. Moisture losses for all the cakes were similar, ≈1% per day during storage. After six days of storage, both C and RF amaranth‐containing cakes had higher hardness and chewiness values than control cakes. Further experiments involving sensory evaluation during storage are necessary to determine the exact limit of amaranth flour replacement.  相似文献   

Safety evaluation of orally administered afoxolaner and milbemycin oxime in eight‐week‐old dogs          下载免费PDF全文

M. Drag  J. Saik  J. Harriman  L. Letendre  S. Yoon  D. Larsen 《Journal of veterinary pharmacology and therapeutics》2017,40(5):447-453

The safety profile of afoxolaner (an isoxazoline molecule) when combined with milbemycin oxime (a macrocyclic lactone) was evaluated according to the regulatory requirements when administered six times orally in a soft chewable formulation at a dose of at least 1×, 3×, or 5× the maximum exposure dose in 8‐week‐old Beagle dogs. Thirty‐two healthy puppies (16 males and 16 females) were enrolled and allocated randomly to one of four treatment groups. Three doses were administered at 28‐day intervals (Days 0, 28, and 56), followed by three additional doses administered with 14‐day intervals (Days 84, 98, and 112). The study ended on Day 126. Treatment groups were as follows: Group 1: untreated, sham‐dosed control; Group 2: afoxolaner/milbemycin oxime chews administered at a dose of at least 5 and 1 mg/kg, respectively (1×); Group 3: afoxolaner/milbemycin oxime chews administered at a dose of at least 15 and 3 mg/kg, respectively (3); and Group 4: afoxolaner/milbemycin oxime chews administered at a dose of at least 25 and 5 mg/kg, respectively (5×). All dogs were examined for general health twice a day beginning on Day ‐14. Physical examinations, and blood collections for clinical pathology analysis and afoxolaner and milbemycin oxime plasma concentrations, were performed throughout the study. No afoxolaner/milbemycin oxime treatment‐related changes were observed in growth, physical variables, clinical pathology variables, or tissues examined histologically. No clinically relevant or statistically significant health abnormalities related to the administration of afoxolaner/milbemycin oxime were observed. No signs of macrocyclic lactone sensitivity were observed at any time during the study. Vomiting and diarrhea were observed sporadically across all groups including the controls. Based upon the results of this study, afoxolaner/milbemycin oxime soft chewables were shown to be safe when administered repeatedly at up to 5× the maximum exposure dose in dogs as young as 8 weeks of age.  相似文献   

Three AFLP markers tightly linked to the genic male sterility <Emphasis Type="Italic">ms</Emphasis><Subscript><Emphasis Type="Italic">3</Emphasis></Subscript> gene in chili pepper (<Emphasis Type="Italic">Capsicum annuum</Emphasis> L.) and conversion to a CAPS marker     

Jundae Lee  Jae Bok Yoon  Jung-Heon Han  Won Phil Lee  Sang Hoon Kim  Hyo Guen Park 《Euphytica》2010,173(1):55-61

Genic male sterility (GMS) has long been used as a tool for hybrid seed production in chili pepper (Capsicum annuum L.). We developed DNA markers linked to the GMS ms ₃ gene in a segregating population using bulked segregant analysis (BSA) and amplified fragment length polymorphism (AFLP) techniques. The segregating population was subjected to BSA-AFLP with 512 primer combinations. Three AFLP markers (Eagg/Mccc₂₇₆, Eagc/Mctt₁₇₈, and Ecag/Mtgc₂₀₄) were identified as tightly linked to the ms ₃ locus. Among them, we converted the AFLP marker Ecag/Mtgc₂₀₄ to the cleavage amplified polymorphic sequence (CAPS) marker, named GMS3-CAPS, based on sequencing analysis of internal and flanking regions for the markers between male-fertile and sterile plants. This marker will be useful for pepper breeding using the GMS system.  相似文献   

Allosteric supramolecular triple-layer catalysts     

Yoon HJ  Kuwabara J  Kim JH  Mirkin CA 《Science (New York, N.Y.)》2010,330(6000):66-69

Allosteric regulation of organometallic catalysts could allow for greater control over reactions. We report an allosteric supramolecular structure in which a monometallic catalytic site has been buried in the middle layer of a triple-layer complex. Small molecules and elemental anions can open and close this complex and reversibly expose and conceal the catalytic center. The ring-opening polymerization of ε-caprolactone can be turned on by the in situ opening of the triple-layer complex and then completely turned off by reforming it through the abstraction of Cl(-), the allosteric effector agent, without appreciable loss of catalytic activity. This process can regulate the molecular weights of the resulting polymers.  相似文献   

64-Channel multi-detector row CT angiographic evaluation of the micropigs for potential living donor lung transplantation     

Woong Yoon  Jung Min Ryu  Min Young Lee  Yong Ju Moon  Sang Hun Lee  Jae Hong Park  Seung Pil Yun  Min Woo Jang  Sung Su Park  Ho Jae Han 《Journal of veterinary science (Suw?n-si, Korea)》2010,11(3):185-189

Micropigs are the most likely source animals for xenotransplantation. However, an appropriate method for evaluating the lung of micropigs had not been established. Therefore, this study was performed to evaluate the feasibility of 64-channel multi-detector row computed tomography (MDCT) to measure the diameter of the pulmonary arteries and the lung volume in micropigs. The mean diameters of the trachea, and left and right bronchi were 1.6 ± 0.17, 1.18 ± 0.14, and 1.1 ± 0.11 cm, respectively. The mean diameters of the main, right, and left pulmonary arteries were 1.38 ± 0.09, 1.07 ± 0.26, and 0.98 ± 0.13 cm and the diameters of right, left, and common inferior pulmonary veins were 0.97 ± 0.20, 0.76 ± 0.20, and 1.99 ± 0.26 cm, respectively. The mean lung volume was 820.3 ± 77.11 mL. The data presented in this study suggest that the MDCT may be a noninvasive, rapid, and accurate investigational method for pulmonary anatomy in living lung donors.  相似文献   

Effect of silicon on growth and salinity stress of soybean plant grown under hydroponic system   总被引：1，自引：0，他引：1  

S. K. Lee  E. Y. Sohn  M. Hamayun  J. Y. Yoon  I. J. Lee 《Agroforestry Systems》2010,80(3):333-340

Silicon (Si) is abundant in the soil, yet its role in plant biology has been poorly understood. The role of Si in soybean growth and its effectiveness in salt stress alleviation was investigated. Sodium metasilicate (Na₂SiO₃) was given as Si source to hydroponically grown soybean (Glycine max (L.) Merr.). The plant growth attributes, i.e. plant height, plant fresh and dry biomass, chlorophyll contents and endogenous gibberellins (GAs) level improved with 2.5 mM Si, while endogenous abscisic acid (ABA) and free proline contents were not affected as compared to control. Sodium chloride (NaCl) significantly decreased growth attributes and endogenous gibberellins levels but markedly enhanced ABA and proline contents of soybean leaves. An addition of Si to salt stressed plants substantially alleviated the adverse effects of NaCl on growth, as it enhanced endogenous gibberellins, while reduced the levels of ABA and proline. GAs analysis of soybean leaves also showed that both early C13 hydroxylation and non C13 hydroxylation pathways of gibberellin biosynthesis were operating in soybean. The major GA biosynthesis pathway was identified as non C13 hydroxylation, which led to the formation of bioactive GA₄. Current study suggests that Si application alleviates the detrimental effect of salinity stress on growth and development of soybean.  相似文献   

Effect of hydrogen peroxide exposures on mucous cells and lysozymes of gill tissues of olive flounder Paralichthys olivaeceus          下载免费PDF全文

Bun Ok Hwang  Yi Kyung Kim  Yoon Kwon Nam 《Aquaculture Research》2016,47(2):433-444

We investigated the effects of hydrogen peroxide on mucous cells and lysozymes in gill tissue of olive flounder. Morphological analysis revealed significant changes in the number of mucous cells after exposure to 300 and 500 mg L ^{? 1} hydrogen peroxide; however, there was no detectable difference in the 100 mg L ^{? 1} group. Lysozyme activities declined gradually in the gill mucus, but in contrast activities in serum increased significantly following the completion of treatment. The hepatic c‐ and g‐type lysozyme levels showed significant responses, indicating that the liver is a major lysozyme producer in response to stress condition; however, in the head kidney, there were no significant changes in the g‐type lysozyme level in all the groups, while the only detectable difference with the c‐type gene in the 300 mg L ^{? 1}. While the treatments showed no significant changes compared with the control for either branchial lysozyme, there were significant differences in c‐type lysozyme between the 3rd treatment and 5 day. Taken together, our data indicate that hydrogen peroxide treatment may lead to modulation of the innate immune response of olive flounder; therefore, the application of hydrogen peroxide in a field system will require more attention to dose and timing effects.  相似文献