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81.
82.
Seung-Ho Ryu Hye Cheong Koo Young-Woo Lee Yong Ho Park Chang-Woo Lee 《Journal of veterinary science (Suw?n-si, Korea)》2011,12(2):195-197
Infectious upper respiratory disease (IURD) of Thoroughbred racehorses has been a frequent problem (29.6% of incidence) at the Seoul Race Park (Korea). Risk factors for IURD include the season with a high transfer rate (summer and fall), the stabling period (≤ 3 months), and age (2 to 3 years old), suggesting that the movement and new environment may have depressed the immune system of the horses and decreased their ability to respond properly to pathogens. The bacterial strains (n = 98) isolated from IURD horses included Pseudomonas spp., Escherichia coli, Staphylococcus spp., Streptococcus equi subsp. equi and zooepidemicus. 相似文献
83.
So Gun Hong Ok Jae Koo Hyun Ju Oh Jung Eun Park Minjung Kim Geon-A Kim Eun Jung Park Goo Jang Byeong-Chun Lee 《Journal of veterinary science (Suw?n-si, Korea)》2011,12(4):405-407
Recently, the world''s first transgenic dogs were produced by somatic cell nuclear transfer. However, cellular senescence is a major limiting factor for producing more advanced transgenic dogs. To overcome this obstacle, we rejuvenated transgenic cells using a re-cloning technique. Fibroblasts from post-mortem red fluorescent protein (RFP) dog were reconstructed with in vivo matured oocytes and transferred into 10 surrogate dogs. One puppy was produced and confirmed as a re-cloned dog. Although the puppy was lost during birth, we successfully established a rejuvenated fibroblast cell line from this animal. The cell line was found to stably express RFP and is ready for additional genetic modification. 相似文献
84.
85.
Eun-Ok Jeon Jong-Nyeo Kim Hae-Rim Lee Bon-Sang Koo Kyeong-Cheol Min Moo-Sung Han Seung-Baek Lee Yeon-Ji Bae Jong-Suk Mo Sun-Hyung Cho Chang-Hee Lee In-Pil Mo 《Journal of veterinary science (Suw?n-si, Korea)》2014,15(4):579-582
Eggs exhibiting eggshell apex abnormalities (EAA) were evaluated for changes in shell characteristics such as strength, thickness, and ultrastructure. Mycoplasma synoviae (MS) infection was confirmed by serological assay along with isolation of MS from the trachea and oviduct. Changes in eggshell quality were shown to be statistically significant (p < 0.01). We also identified ultrastructural changes in the mammillary knob layer by Scanning Electron Microscopy. While eggs may seem to be structurally sound, ultrastructural evaluation showed that affected eggs do not regain their former quality. In our knowledge, this is the first report describing the occurrence of EAA in Korea. 相似文献
86.
In order to assess the potential of the hydroxy-containing polyamic acid (PHAA) synthesized from 3,3′-dihydroxy benzidine
and pyromellitic dianhydride for a fire-safe polymer, the cyclization pathway of PHAA has been investigated using a model
compound prepared from 2-aminophenol and phthalic anhydride. The reaction was monitored by1H-nuclear magnetic resonance. N-(2-hydroxyphenyl)phthalamic acid is converted to N-(2-hydroxyphenyl)phthalimide at ca. 175°C,
showing endothermic reaction. The imide structure is rearranged to the benzoxazole structure over ca. 400°C. These results
are similar with that of PHAA. According to pyrolysis-gas chromatography/mass spectrometry (Py-GC/MS) data, water and carbon
dioxide are released during the cyclization and rearrangement reaction. One DMAc molecule is complexed with one carboxyl acid
group in PHAA, which accelerates the imidization process to release more easily the flame retardant, water. 相似文献
87.
The effect of functional under-layer on muscle activity and exercise performance was investigated on the basis of physiological tests and electromyography (EMG). EMG was used to study muscle activity during exercise after fitting compressional under-layer. We observed slight differences in the results of anaerobic and aerobic muscle EMG tests among subjects because of differences in body muscle content. In addition, muscle activity was varied according to muscle parts used during the physiological tests with fitting the functional under-layer. We suggest that compressional under-layer decreases muscle vibration and improves blood circulation, resulting in overall improved muscle activity on the basis of the usage of different muscles in each type of exercise. However, future studies are needed to evaluate the long-term effects of the functional under-layer. 相似文献
88.
Hyun Jin Koo Gap Shik Chang Seong Hun Kim Wan Gyu Hahm Seong Yoon Park 《Fibers and Polymers》2013,14(12):2083-2087
Mechanical properties and the long-term degradation properties of the recycled PET yarns are typically lower than the virgin PET yarns due to the contaminants coming from non-PET bottles, labels and caps etc. For environmental reasons, recycling of post-consumer polyester bottles into textile fibers has become commercially attractive. We studied mechanical and chemical recycling processes and examined their effects on yarn properties such as tensile properties, thermal characteristics, hydrolysis and photo-degradation. It was found that the virgin and the chemical recycled yarns with sufficient purification show similar processability, physical and mechanical properties, and long-term degradation behavior. The results provide useful information on recycled PET yarns for processability and serviceability for the high-end use. 相似文献
89.
Jesús Núñez Diana Castro Christian Fernández Rémi Dugué Fred Chu‐Koo Fabrice Duponchelle Carmen García Jean‐François Renno 《Aquaculture Research》2011,42(6):764-775
In Pseudoplatystoma punctifer (e.g. Pseudoplatystoma fasciatum) larvae, parental effects on hatching, growth of initial stages and dry feed adaptation were evaluated as they could influence fry heterogeneity, which is responsible for the enhancement of cannibalism, and which remains one of the main factors of mortality during larval stages. A full factorial experiment was carried out with 3 females × 3 males producing nine families of full siblings, raised separately in triplicates into 30 L tanks at 28±0.5 °C in a water recirculating system. Paternal and maternal effects were observed on hatching success, yolk utilization efficiency and growth until 26 days post fertilization. Hatching success was generally over 80% except for one male × female combination (25%). Total length (TL) at hatching and during the first 4 weeks of exogenous feeding on live Artemia nauplii and dry feeds was determined in each family using digital photographs of larvae and nih image j analysis freeware. Mean TL was calculated for each family at each sampling time and analysed using multifactorial analysis of variance tests. These results indicate not only dam but also sire effects at very early developmental stages as well as in subsequent stages of P. punctifer. 相似文献
90.
Lobo MK Covington HE Chaudhury D Friedman AK Sun H Damez-Werno D Dietz DM Zaman S Koo JW Kennedy PJ Mouzon E Mogri M Neve RL Deisseroth K Han MH Nestler EJ 《Science (New York, N.Y.)》2010,330(6002):385-390
The nucleus accumbens is a key mediator of cocaine reward, but the distinct roles of the two subpopulations of nucleus accumbens projection neurons, those expressing dopamine D1 versus D2 receptors, are poorly understood. We show that deletion of TrkB, the brain-derived neurotrophic factor (BDNF) receptor, selectively from D1+ or D2+ neurons oppositely affects cocaine reward. Because loss of TrkB in D2+ neurons increases their neuronal excitability, we next used optogenetic tools to control selectively the firing rate of D1+ and D2+ nucleus accumbens neurons and studied consequent effects on cocaine reward. Activation of D2+ neurons, mimicking the loss of TrkB, suppresses cocaine reward, with opposite effects induced by activation of D1+ neurons. These results provide insight into the molecular control of D1+ and D2+ neuronal activity as well as the circuit-level contribution of these cell types to cocaine reward. 相似文献