Park, Hyung Soo;Choi, Ki Choon;Yang, Seung Hak;Jung, Jeong Sung;Lee, Bae Hun
Journal of The Korean Society of Grassland and Forage Science
/
v.42
no.1
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pp.26-31
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2022
This study was carried out to evaluate the growth characteristics and forage yield potential for warm season grass as emergency forages. The experimental design was a randomized block design (RBD) with three replications. Two barnyard millet (Echinochloa species cv. Shirohie and Jeju native), a pearl millet (Pennisetum glaucum cv Feed milk 2) a proso millet (Panicum miliaceum cv Native), a teffgrass (Eragrostis tef cv. Tiffany) and a kleingrass (Panicum coloratum cv. Selection 75) were compared for forage production and quality at the Mid regions of Korea. Warm season forage crops were sown on May 21 and June 23 respectively, and in 2021, it was sown twice on May 21 and June 21 The number of days to seedling emergence for barnyard millet and teffgrass was observed approximately 10 and 3 days after seeding, respectively. The cultivation period from seeding to harvest was within 60 days for all entry spices except for the late-heading type barnyard millet (within 84 days). As for the dry matter yield by seeding date, the dry matter yield of the late-heading type barnyard millet in May seeding was the highest at 23,872 kg/ha, and the kleingrass was the lowest at 3,888 kg/ha. For the June seeding, the dry matter yield of the late-heading type barnyard millet was 17,032 kg/ha, the highest, and the proso millet, teffgrass and kleingrass showed the lowest at 5,468, 5,442, and 5,197 kg/ha, respectively. The crude protein (CP) content was varied by warm season grass species, but the early-heading type barnyard millet, teffgrass, and kleingrass showed the highest tendency, and the late-heading type barnyard millet showed the lowest at 5.7~5.9%. Neutral detergent fiber (NDF) and acid detergent fiber (ADF) content did not show a significant difference between the seeding in May, but kleingrass in June sowed lower than the others.
Kim, Eun-Kyung;Cho, Dae Hyun;Suh, Sang-Ik;Lee, Chang-Jun;Kim, Hee-Sik;Suh, Hyun-Hyo
Journal of Life Science
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v.32
no.3
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pp.202-209
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2022
The green alga Chlamydomonas reinhardtii, a unicellular haploid eukaryote, has long been used by researchers and industries as a cell factory to produce high value-added microalgae substances using genetic modification. Microalga K01, presumed to be Chlamydomonas, was isolated from 12 freshwater samples from the Chungcheong and Jeolla regions to replace C. reinhardtii, an introduced species currently used in most basic and industrial research. The isolated K01 strain was identified as C. reinhardtii through morphological and phylogenetic studies of the 18S rDNA gene sequence (NCBI accession number KC166137). The growth and lipid content of the isolated C. reinhardtii K01 were compared with three wild and four mutant strains in TAP medium, and it was found that the K01 strain could produce 1.74×107 cells/ml by the third day of culture. The growth rate of C. reinhardtii K01 was 1.5 times faster than UTEX2244, which showed the highest number of cells (1.20×107 cells/ml) among the compared strains. The lipid content of the isolated C. reinhardtii K01 (20.67%) was similar to those of the wild strains, although the fatty acid oleate C18:1 was not detected in the isolated strain but was identified in the seven others. The cell density of the isolated strain increased to 0.87 g/l during a six-day culture in BG11 medium, where nitrate (NaNO3) was introduced as a nitrogen source, while the seven acquired strains showed almost no cell proliferation.
Jeong, Eun Chan;Li, Yan Fen;Wang, Li Li;Li, Sang Hoon;Ahmadi, Farhad;Kim, Jong Geun
Journal of The Korean Society of Grassland and Forage Science
/
v.42
no.1
/
pp.41-46
/
2022
To investigate the domestic seed production potential of Italian ryegrass, it was sown in autumn in the southern region and harvested in the spring of the following year to investigate the productivity and quality of seeds and straw. Italian ryegrass (Lolium multiflorum Lam.) 'GreenCall' variety was sown in Jinju, Gyeongnam in the fall of 2020 with three seeding rates (20, 30 and 40 kg/ha). The experiment was arranged consisted of a randomized block design with three replications. The ryegrass was sown on October 17, 2020, and the harvest was on May 31, about 60 days from the heading stage. The heading stage of Italian ryegrass was April 28, and there was no difference among treatments. Plant height was significantly shorter in the 40 kg/ha seeding treatment group, and there was no significant difference in the remaining treatments. The resistance of lodging, disease, and cold did not show significant differences among treatments. Spike length and number of seeds per spike were highest at 20 kg/ha seeding amount, and there was no difference in the remaining treatments. The seed yield was the highest at 1,956 kg/ha in the 20 kg/ha seeding rate, and there was no difference in the 30 and 40 kg/ha seeding rates. The dry matter content of seeds and straws was 45.60 and 41.83% on average, and there was no significant difference among treatments. The amount of remaining straw after seed harvesting was found to be 7,689 kg/ha on average on a dry basis, and it was high in the 40 kg/ha sowing area, but there was no significant difference among treatments. According to the above results, it was found that it is most advantageous to sow at 20 kg/ha when producing Italian ryegrass seeds through autumn sowing in the southern region.
Lee, Se Young;Cheon, Dong Won;Park, Hyung Soo;Choi, Ki Choon;Yang, Seung Hak;Lee, Bae Hun;Lee, Byeong U;Jung, Jeong Sung
Journal of The Korean Society of Grassland and Forage Science
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v.42
no.1
/
pp.17-25
/
2022
This study was carried out the estimation on consumption patterns and consciousness of domestic forage for improvement of the quality of domestic forage. Although the cultivated area in South Korea of forage has increased significantly compared to the past, the self-sufficiency rate of domestic forage has increased to around 80% since 2010. Also, livestock farmers prefer to use import forage than domestic due to convenience of use. In Korean beef farms, the ratio of import to domestic forage was higher in domestic forage (import forage 3 : domestic forage 7). In the method of securing domestic forage, purchase of forage (55.6%) was higher than self-cultivation of forage (44.4%). The ratio of use by bailing type was shown in the order of rice staw rice straw (50.5%), domestic hay (15%), imported hay (12.5%), and total mixed ratio (10.7%). The preference of forage was in the order of amount of foreign matter, moisture content, price, feed value in Korean native cattle farm. The result of satisfaction with domestic and import forage showed that the satisfaction of domestic forage price was higher than import forage, while the moisture content and foreign matter of forage were lower than import forage. In addition, in the results of the satisfaction and importance of domestic roughage compared to imported roughage, satisfaction with imported roughage was generally high in all items except for price. As a result, in order to improve the satisfaction of domestic forage in Korean native cattle farm, it is necessary to minimize foreign matter in forage and increase hay production for moisture content uniform in forage.
In this study, growth changes of the diameter at breast height (DBH), height, basal area, volume, and biomass of Korean white pine (Pinus koraiensis Siebold & Zucc.) on a plantation were examined via long-term monitoring. In addition, this study was performed to provide the basic data for timber production in line with DBH class by comparing the growth of the relative DBH size. Growth characteristics according to DBH class were analyzed by categorizing trees into five classes based on sorted DBH rankings: class I (1%-20%; upper 20%), class II (21%-40%), class III (41%-60%), class IV (61%-80%), class V (81%-100%; lower 20%). A total class (0%-100%) was also used. Total increment and mean annual increment (MAI) were calculated using data from nine measurements taken over 39 years. Tree characteristics based on average values and stand characteristics based on unit area per hectare were examined. According to the total increments of variables, the differences in DBH, basal area, volume, and biomass among classes I-V increased over time, whereas the height difference did not continually increase. According to MAI, the maximum DBH value was 0.92 cm·yr-1 at age 23 in class I, whereas the maximum value in all trees was 0.69 cm·yr-1 at age 17. The maximum value of height MAI for class I was 0.52 m·yr-1 at age 23, whereas that for all trees was 0.49 m·yr-1 at age 20. In terms of basal area, volume, and biomass growth at tree-and stand-level, the maximum MAI of class I and all trees was not observed during the measurement period. Therefore, additional long-term monitoring data are required to determine the maximum MAI of the variables.
Melanogenesis is the production of melanin from tyrosine by a series of enzyme-catalyzed reactions, in which tyrosinase and DOPA oxidase play key roles. The melanin content in the skin determines skin pigmentation. Abnormalities in skin pigmentation lead to various skin pigmentation disorders. Recent research has shown that the expression of EMP2 is much lower in melanoma than in normal melanocytes, but its role in melanogenesis has not yet been elucidated. Therefore, we investigated the role of EMP2 in the melanogenesis of MNT1 human melanoma cells. We examined TRP-1, TRP-2, and TYR expression levels during melanogenesis in MNT1 melanoma cells by gene silencing of EMP2. Western blot and RT-PCR results confirmed that the expression levels of TYR and TRP-2 were decreased when EMP2 expression was knocked down by EMP2 siRNA in MNT1 cells, and these changes were reversed when EMP2 was overexpressed. We verified the EMP2 gene was knocked out of the cell line (EMP2 CRISPR/Cas9) by using a CRISPR/Cas9 system and found that the expression levels of TRP-2 and TYR were significantly lower in the EMP2 CRISPR/Cas9 cell lines. Loss of EMP2 also reduced migration and invasion of MNT1 melanoma cells. In addition, the melanosome transfer from the melanocytes to keratinocytes in the EMP2 KO cells cocultured with keratinocytes was reduced compared to the cells in the control coculture group. In conclusion, these results suggest that EMP2 is involved in melanogenesis via the regulation of TRP-2 expression.
Background: Ginsenoside compound K (CK), the main active metabolite in Panax ginseng, has shown good safety and bioavailability in clinical trials and exerts neuroprotective effects in cerebral ischemic stroke. However, its potential role in the prevention of cerebral ischemia/reperfusion (I/R) injury remains unclear. Our study aimed to investigate the molecular mechanism of ginsenoside CK against cerebral I/R injury. Methods: We used a combination of in vitro and in vivo models, including oxygen and glucose deprivation/reperfusion induced PC12 cell model and middle cerebral artery occlusion/reperfusion induced rat model, to mimic I/R injury. Intracellular oxygen consumption and extracellular acidification rate were analyzed by Seahorse multifunctional energy metabolism system; ATP production was detected by luciferase method. The number and size of mitochondria were analyzed by transmission electron microscopy and MitoTracker probe combined with confocal laser microscopy. The potential mechanisms of ginsenoside CK on mitochondrial dynamics and bioenergy were evaluated by RNA interference, pharmacological antagonism combined with co-immunoprecipitation analysis and phenotypic analysis. Results: Ginsenoside CK pretreatment could attenuate mitochondrial translocation of DRP1, mitophagy, mitochondrial apoptosis, and neuronal bioenergy imbalance against cerebral I/R injury in both in vitro and in vivo models. Our data also confirmed that ginsenoside CK administration could reduce the binding affinity of Mul1 and Mfn2 to inhibit the ubiquitination and degradation of Mfn2, thereby elevating the protein level of Mfn2 in cerebral I/R injury. Conclusion: These data provide evidence that ginsenoside CK may be a promising therapeutic agent against cerebral I/R injury via Mul1/Mfn2 mediated mitochondrial dynamics and bioenergy.
Sa, S.J.;Wee, M.S.;Oh, J.Y.;Cheong, H.T.;Park, S.B.;Yang, B.K.;Kim, C.I.;Park, C.K.
Korean Journal of Animal Reproduction
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v.25
no.4
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pp.327-337
/
2001
This study investigated the effects of superoxide dismutase (SOD) on lipid peroxidation and fertilizing ability in vitro of boar spermatozoa frozen-thawed. The percentages of motile sperm were highest when SOD of 10 units/$m\ell$ was added to washing medium for spermatozoa. However, the rates of motile sperm were not significantly different in different concentrations of SOD. On the other hand, the motile rates of sperm washed with SOD were lower in sperm inculbated for 120 min than 30 min regardless of the different concentrations of SOD. The percentage of spermatozoa that reached acrosome reaction were increased with incubation periods prolonged. No significant differences, however, were observed in acrosome reaction rates between sperm incubated with and without SOD supplementation for 0, 60 and 120 min. When oocyies inseminated with different concentrations of SOD, the penetration rates were significantly (P<0.05) higher in medium with 1 unit/$m\ell$ than 0, 10 and 100 units/$m\ell$ of SOD. However, the proportions of polyspermit oocytes were significantly (P<0.05) lower in medium with 10 and 100 units/$m\ell$ than 0 unit/$m\ell$ of SOD. In another experiment, the sperm suspension were also treated with different concentrations of SOD and were assayed far sulfhydryl(-SH) group content. In the groups treated with 100 units/$m\ell$ of SOD, sperm-SH group were higher than another groups. However, sperm-SH group content were not siginificantly different in spermatozoa treated with different concentrations of SOD. Under the same conditions, the lipid peroxidation of sperm was evaluated on the basis of malondialdehyde production. The addition of SOD to sperm suspension decreased the formation or malondialdehyde. However, there were not significantly different in sperm treated with different concentrations of SOD. The activity of sperm binding to zona pellucida was also evaluated through binding to salt-stored porcine oocytes. The sperm binding to zona pellucida were gradually increased with SOD concentrations added. The number of spermatozoa binded to zona pellucida were significantly (P<0.05) higher in medium with 100 units/$m\ell$ than 0 units/$m\ell$ of SOD. These findings suggested that SOD cause an enhancement penetrarion ability and sperm zona binding in boar spermatozoa frozen-thawed.
Journal of the Korea Organic Resources Recycling Association
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v.30
no.1
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pp.13-21
/
2022
Mushroom waste medium refers to the waste biomass generated after mushroom cultivating. And, the burden of treatment on mushroom farmhouse is increasing due to the absence of appropriate treatment method and increase of treatment costs of the mushroom waste medium. In this study, in order to assess the energy value of mushroom waste medium by an anaerobic digestion, methane potential and anaerobic organic matter decomposition characteristics were investigated. The theoretical methane potential(Bth) of mushroom medium(MM) was 0.481 Nm3-CH4/kg-VSadded, and the Bth of mushroom waste medium(MWM) was 0.451 Nm3-CH4/kg-VSadded. The biochemical methane potential(Bu-exp) of MWM was increased by 18% from 0.155 for MM to 0.183 Nm3-CH4/kg-VSadded for MWM. In the reaction kinetics analysis by the Modified Gompertz model, the maximum methane production rate(Rm) was increased from 4.59 for MM to 7.21 mL/day for MWM and the lag growth phase time(λ) was decreased from 2.78 for MM to 1.96 days for MWM. In the reaction kinetics analysis by the parallel first order kinetics model, the easily degradable organic matter(VSe) content was increased by 5.89% and the persistently degradable organic matter(VSp) content was 2.03% in MWM, and the non-degradable organic matter(VSNB) content was decreased by 7.85%. Therefore, it was evaluated that the anaerobic digestion efficiency of MWM was increased. The anaerobic digestion efficiency of MWM was assessed to be more improved than that of MM.
Films of the 1960s in both Korea and Egypt share many common characteristics. These include the main trend of such films' in addition to some of the political situations. This trend mainly relates to the adaptation of novels into films. In the late 1940s, Andre Bazin wrote his ideas about a similar phenomenon in Europe and the United States. Based on Bazin's thoughts and other examples for films adapted from novels in the 1940-60s, I found that the trend in both Korea and Egypt can be explained as an international phenomenon, in which film developed to a further stage due to a dialectic between content and form after the increase in the development of film techniques. The trend in Korea is believed to have led to the so-called golden era of Korean movies, while in Egypt films adapted from literature were not able to earn high profits, even though in a 1996 list of the best 100 Egyptian films, 23 had been adapted from novels. To explain the reasons behind this phenomenon, I looked into the internal demand from filmmakers themselves to further develop the industry through the articles written at that time. In addition, I explored the different situations and policies that influenced film production in both countries in the 1960s. I found that political situations and policies could have helped in the continuity of such trend, but it is difficult to consider these as the main reason for its creation, in contrast to the internal demand, which I believe is the main reason for the creation of such direction.
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