Kim, Dong-Heui;Chang, Byung-Soo;Teng, Yung-Chien;Kwon, Jung-Kyun;Lee, Myeong-Seon;Lee, Gui-Young;Lee, Kyu-Jae
Applied Microscopy
/
v.40
no.2
/
pp.65-71
/
2010
Kribensis, Pelvicachromis pulcher is a teleost belonging to Cichlidae. The oogenesis was investigated by light microscope. The ovary was located between intestine and air bladder, a yellowish and ellipsoidal shape with the major axis 20mm and the minor axis 5 mm. Cytoplasm of oogonia in early stage was basophilic and many nucleoli were located at inside of nuclear membrane. In primary oocytes, yolk vesicles were distributed only in the marginal area and egg envelope was not formed on the outside of an egg. In secondary oocytes, the egg envelope was formed and yolk vesicles in the cytoplasm were increased than the earlier stage. The basophilic substance of cytoplasm was changed to acidic. Some yolk vesicles started forming small yolk mass except the surrounding nucleus. In case of matured egg, size of egg were increased. The yolk vesicles were changed to yolk mass in accordance with development. The yolk mass contained crystal-like structures. In conclusion, the oogenesis of Pelvicachromis pulcher was summarized by the increase in cell size, the formation and the accumulation of yolk, and the decrease of basophilic substance in the cytoplasm. The oogenesis of Coreoleuciscus splendidus is similar with other teleost. But there were differences in distribution of yolk vesicle and yolk mass containing cristal-like structures.
The functional sausage added to effective extracts are prepared to carried out to investigate functional and storage characteristics. This products were stored at different temperature. The changes of pH were tended to be a little ranged from pH 6.07 to pH 6.35 in control. At the same time, the pH changes treated with plant extracts showed the same tendency as control. The treatments using natural extracts revealed a little low TBARS value during storage at 10$^{\circ}C$. The nitrite scavenging ability of extracts from pine needle were higher than those of green tea extracts, irrespective of storage temperature. The VBN content was tended to be increased as storage time goes by, irrespective of storage temperature. The treatments using plant extracts revealed a little low VBN content, compared to control during storage. The changes of total bacteria were more increased to 2.2${\times}$10$^1$∼3.2 ${\times}$ 10$\^$6/ CFU/g during storage at 30$^{\circ}C$ than 2.2${\times}$10$^1$∼3.3${\times}$10$^2$CFU/g in case of storage at 10$^{\circ}C$. The treatments using plant extracts revealed an antimicrobial activity until storage at 3 days, compared to control. The lightness of sausage color were a little more decreased gradually during storage at 30$^{\circ}C$ than those of storage at 10$^{\circ}C$. Overall, the lightness of sausage color treated with pine needle extracts were a more bright than those of control. However, the redness of sausage color treated with pine needle and green tea showed the most lowest red color, compared to control. Sensory test suggested that the changes of sausage color, flavor, texture and taste were tended to be decreased gradually. In conclusion, pine needle extract was the most effective natural resources on the basis of the functional and physico-chemical properties of sausage of sausage.
Stress-susceptible pigs have been known as the porcine stress syndrome (PSS), swine PSS, also known as malignant hyperthermia (MH), is characterized as sudden death and production of poor meat quality such as PSE (pale, soft and exudative) meat after slaughtering. PSS and PSE meat cause major economic losses in the pig industry. A point mutation in the gene coding for the ryanodine receptor (RYR1) in porcine skeletal muscle, also known calcium (Ca$^{2+}$) release channel, has been associated with swine PSS and halothane sensitivity. We used the PCR-RFLP(restriction fragment length polymorphism) and PCR-SSCP (single strand conformation polymorphism) methods to detect the PSS gene mutation (C1843T) in the RYR1 gene and to estimate genotype frequencies of PSS gene in Korean pig breed populations. In PCR-RFLP and SSCP analyses, three genotypes of homozygous normal (N/M), heterozygous carrier (N/n) and homozygous recessive mutant (n/n) were detected using agarose or polyacrylamide gel electrophoresis, respectively. The proportions of normal, carrier and PSS pigs were 57.1, 35.7 and 7.1% for Landrace, 82.5, 15.8 and 1.7% far L. Yorkshire, 95.2, 4.8 and 0.0% for Duroc and 72.0, 22.7 and 5.3% for Crossbreed. Consequently, DNA-based diagnosis for the identification of stress-susceptible pigs of PSS and pigs producing PSE meat is a powerful technique. Especially, PCR-SSCP method may be useful as a rapid, sensitive and inexpensive test for the large-scale screening of PSS genotypes and pigs with PSE meat in the pork industry.y.
Detection of Mycoplasma DNA from the 30 cases of cancer tissues and the normal tissues surrounding the cancer tissues obtained from the patients with gastric cancer and the other 30 cases of cancer tissues and the normal tissues surrounding the cancer tissues obtained from the patients with colon cancer were evaluated by polymerase chain reaction(PCR). The PCR products were sequenced using an ABI 377 automatic DNA sequencer, and these sequences were confirmed by comparing sequences with the database of the National Center for Biotechnology Information BLAST network server. Mycoplasmas DNA were defected in 18 (60%) cases of normal tissues which were around gastric cancer and were 13 (43.3%) cases of gastric cancer tissues. Mycoplasmas DNA were detected in 15(50%) cases of normal tissues which were around colon cancer and 12 (40%) cases of colon cancer tissues. The M. faucium, M. subdolum, M. salivarium, M. auris, M. hyosynoviae, and M. conjunctivae were detected from the gastric cancer tissues. The M. faucium, M. subdolum,, M. salivarium, M. auris, M. hyosynoviae, M. bovigenitalium and M. pulmonis were detected from the normal tissues around gastric cancer. The M. faucium, M. subdolum, M. salivarium, M. auris, M. hyosynoviae, M. synoviae M. bovigenitalium, M. gallinarum, and M. moatsii were detected from the colon cancer. The M. faucium, M. subdolum, M. salivarium, M. auris, M. hyosynoviae, M. bovis, M. opalescens, M. bovigenitalium, M. gallinarum, and M. moatsii were detected from the normal tissues around the colon cancer. These results suggest that Mycoplasmas infection may not correlate with gastric cancer and colon cancer, because of the detection rate of Mycoplasmas DNA were not significantly differences between normal and cancer tissues from the patients.
Park, Moon-Sung;Lim, Hyun-Tae;Oh, Ki-Cheol;Moon, Young-Rok;Kim, Jong-Gap;Jeon, Jin-Tae
Journal of Life Science
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v.21
no.3
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pp.385-392
/
2011
The otter (Lutra lutra) in Korea is classified as a first grade endangered species and is managed under state control. We performed a phylogenetic analysis of the otter that inhabits the Changnyeong, Jinju, and Geoje areas in Gyeongsangnamdo, Korea using mtDNA and microsatellite (MS) markers. As a result of the analysis using the 676-bp D-loop sequence of mtDNA, six haplotypes were estimated from five single nucleotide polymorphisms. The genetic distance between the Jinju and Geoje areas was greater than distances within the areas, and the distance between Jinju and Geoje was especially clear. From the phylogenetic tree estimated using the Bayesian Markov chain Monte Carlo analysis by the MrBays program, two subgroups, one containing samples from Jinju and the other containing samples from the Changnyeong and Geoje areas were clearly identified. The result of a parsimonious median-joining network analysis also showed two clear subgroups, supporting the result of the phylogenetic analysis. On the other hand, in the consensus tree estimated using the genetic distances estimated from the genotypes of 13 MS markers, there were clear two subgroups, one containing samples from the Jinju, Geoje and Changnyeong areas and the other containing samples from only the Jinju area. The samples were not identically classified into each subgroup defined by mtDNA and MS markers. It could be inferred that the differential classification of samples by the two different marker systems was because of the different characteristics of the marker systems used, that is, the mtDNA was for detecting maternal lineage and the MS markers were for estimating autosomal genetic distances. Nonetheless, the results from the two marker systems showed that there has been a progressive genetic fixation according to the habitats of the otters. Further analyses using not only newly developed MS markers that will possess more analytical power but also the whole mtDNA are needed. Expansion of the phylogenetic analysis using otter samples collected from the major habitats in Korea should be helpful in scientifically and efficiently maintaining and preserving them.
Pemetrexed has demonstrated clinical activity in non-small cell lung cancer (NSCLC) as well as other solid tumors. It transports into the cells via reduced folate carrier (RFC) and is polyglutamated by folypolyglutamate synthetase (FPGS). Pemetrexed directly inhibits several folate-dependent enzymes such as thymidylate synthase (TS), dihydrofolate reductase (DHFR), and glycinamide ribonucleotide formyltransferase (GARFT). We investigated the effects of genetic variations and the expression of RFC, FPGS, TS and DHFR enzymes on drug sensitivity to pemetrexed in NSCLC cells. Polymorphisms in RFC, FPGS, and DHFR were genotyped in four NSCLC cells - A549, PC14, HCC-1588, and H226. Real-time RT-PCR and Western blot was performed to evaluate mRNA transcripts and protein of these genes. The cytotoxicity of pemetrexed was measured by SRB assay. In PC14 and H226 cells, increased mRNA expressions of RFC and FPGS were associated with higher cytotoxicity to pemetrexed. 2R/2R genotype of TS and its increased mRNA expression were associated with drug resistance to pemetrexed in A549 cells, whereas 3R/3R genotype in TS with decreased mRNA expression was associated with higher sensitivity in H226 cells. After pemetrexed treatment, an inverse change of DHFR mRNA and protein expression was found. The strongest linkage disequilibrium (LD) was discovered between-1726C>T and -1188A>C SNP of DHFR gene. Our findings suggest the cytotoxic effect of pemetrexed may be associated with genetic polymorphisms and the expression level of genes involved in pemetrexed metabolisms in NSCLC cells.
Ham, Seung-Hee;Choi, Nack-Shick;Moon, Ja-Young;Baek, Sun-Hwa;Lee, Song-Min;Kang, Dae-Ook
Journal of Life Science
/
v.27
no.2
/
pp.202-210
/
2017
As an effort to find a potential biopreservative, we isolated bacterial strains producing bacteriocin from fermented foods. A strain was finally selected and characteristics of the bacteriocin were investigated. The selected strain was identified as Bacillus subtilis E9-1 based on the 16S rRNA gene analysis. The culture supernatant of B. subtilis E9-1 showed antimicrobial activity against Gram-positive bacteria. Subtilisin A, ${\alpha}$-chymotrypsin, trypsin and proteinase K inactivated the antimicrobial activity, which means its proteinaceous nature, a bacteriocin. The bacteriocin activity was fully retained at the pH range from 2.0 to 8.0 and stable at up to $100^{\circ}C$ for 60 min. Solvents such as ethanol, isopropanol and methanol had no effect on the antimicrobial activity at the concentration of 100% but acetone and acetonitrile reduced the activity at up to 100% concentration. Cell growth of four indicator strains was dramatically decreased in dose-dependent manner. Listeria monocytogenes was the most sensitive, but Enterococcus faecium was the most resistant. Bacillus cereus and Staphylococcus aureus showed the medium sensitivity. The bacteriocin showed its antimicrobial activity against B. cereus and L. monocytogenes via bactericidal action. The number of viable cells of L. monocytogenes started to reduce after addition of bacteriocin to the minced beef. The bacteriocin was purified through acetone concentration, gel filtration chromatography and RP-HPLC. The whole purification step led to a 6.82 fold increase in the specific activity and 6% yield of bacteriocin activity. The molecular weight of the purified bacteriocin was determined to be 3.3 kDa by MALDI-TOF/TOF mass spectrometry.
LEE Kang-Ho;CHO Ho-Sung;LEE Dong-Ho;KIM Min-Gi;CHO Young-Je;SUH Jae-Soo;KIM Dong-Soo
Korean Journal of Fisheries and Aquatic Sciences
/
v.26
no.4
/
pp.330-339
/
1993
To optimize the processing conditions of fermented ascidian, Halocynthia roretzi, fermentation at low temperature with different salt contents, the effect of enzymes added, and the quality changes during fermentation were investigated. As the quality factors, changes in such components as free amino acid, volatile basic nitrogen(VBN), amino nitrogen, total creatinine, total carotenoid, extents of browning, reducing sugar and glycogen were determined. The quality was also evaluated organolatically by pannel test. Fresh deshelled and sliced ascidian were fermented for 50 days at $5{\pm}1^{\circ}C$ with different salt contents of 5, 10, $15\%$ (w/w) with enzyme contents of papain $0.1\%$ and protease-A $0.1\%$ VBN increased gradually during the 50 days of fermentation and showed $30{\sim}40mg/100g$ at 30, 35 and 45 days in case of salt contents 5, 10 and $15\%$ added with $0.1\%$ papain and protease-A, respectively. Amino nitrogen and the total creatinine increased until 20 days, hereafter tended to decrease gradually. Total carotenoid and glycogen also decreased during the fermentation. The results of sensory evaluation of fermented ascidian at $5{\pm}1^{\circ}C$ added $0.1\%$ papain or protease-A showed that the peculiar taste and flavor of ascidian was sustained for $30{\sim}40$ at least 20 days with $5\%$ NaCl and $35{\sim}45$ days of fermentation with 10 and $15\%$ NaCl.
Ji, Seung-Cheol;Takaoka, Osamu;Seoka, Manabu;Kohbara, Jun;Hosokawa, Hidetuyo;Shimeno, Sadao;Jeong, Gwan-Sik;Lee, Si-Woo;Takii, Kenji
Journal of Aquaculture
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v.20
no.1
/
pp.19-25
/
2007
For establishing a basal diet for the Pacific bluefin tuna Thunnus orientalis (PBT), feeding stimulants were initially identified by omission test using the synthetic extract of horse mackerel, Trachurus japonicus. Four feeding trials were conducted using juvenile PBT weighing $9.0{\pm}0.91\;g$ (trial 1, 2 and 3) and $1.6{\pm}0.23\;g$ (trial 4), which were originated from an artificial seedling production. The fish fed the casein diet with each test solution were added at the ratio of 100 g casein diet to 100 g jack mackerel muscle. A complete synthetic extract of jack mackerel containing all 3 fractions, amino acid, nucleotide and organic nitrogenous base, exhibited a comparable feeding stimulant activity compared to that of natural extract. The omission of nucleotide or amino acid fraction showed lower feeding activity, but the omission of other nitrogenous fraction maintained a similar feeding stimulant activity compared to that of the synthetic extract (trial 1). Inosine-5' monophosphate $Na_2$ (IMP) was identified as a major constituent for maintaining feeding activity. The mixture of L-alanine, L-glutamic acid, L-histidine, L-lysine, taurine and IMP induced a similar feeding activity compared to that of the synthetic extract (trial 2 and 3). In trial 4, the highest feeding activity was finally obtained in the mixture of L-histidine, L-glutamine and IMP, followed by the synthetic extract, the mixture of L-lysine, L-alanine and IMP, IMP and the mixture of L-histidine, L-glutamic acid, L-lysine and L-alanine. These results revealed that the mixture of L-histidine, L-glutamic acid and IMP for the proper feeding stimulant of PBT in this study.
Hwang, Jung Hye;Koh, Won-Jung;Lee, Shin Hye;Kim, Eun Joo;Kang, Eun Hae;Suh, Gee Young;Chung, Man Pyo;Kim, Hojoong;Kwon, O Jung
Tuberculosis and Respiratory Diseases
/
v.58
no.1
/
pp.11-17
/
2005
Background : Interferon-gamma ($IFN-{\gamma}$) is essential in the immune response to mycobacterial infections, and a complete or partial deficiency in the $IFN-{\gamma}$ receptor 1 ($IFN{\gamma}R1$) or the $IFN-{\gamma}$ receptor 2 ($IFN{\gamma}R2$) have been reported to confer susceptibility to a disseminated infection with nontuberculous mycobacteria. However, similar mutations in the $IFN-{\gamma}$ receptor have not been specifically examined in the patients with clinical tuberculosis. Methods : This study searched for mutations in the $IFN-{\gamma}$ receptor gene that resulted in a partial $IFN-{\gamma}$ receptor deficiency in six patients with disseminated tuberculosis. The previously identified $IFN{\gamma}R1$ and $IFN{\gamma}R2$ coding regions were sequenced after amplification. Results : There was no partial $IFN{\gamma}R1$ deficiency including a homozygous recessive missense mutation causing an amino-acid substitution in the extracellular domain of the receptor (I87T) and a hotspot for small deletions (818delT, 818del4, 818insA) found in any of the patients. In addition, a partial $IFN{\gamma}R2$ deficiency of the homozygous missense mutation (R114C) was not found in any of the patients. Conclusion : Genetic defects causing a partial $IFN-{\gamma}$ receptor deficiency were not identified in our patients with disseminated tuberculosis.
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