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        검색결과 303

        221.
        2017.05 서비스 종료(열람 제한)
        Background : Cellular oxidative stress as reactive oxygen species (ROS), whether produced endogenously as a consequence of normal cell functions or derived from external sources, pose a constant threat to cells living in an aerobic environment as they can result in severe damage to DNA, protein, and lipids. The effects of Valeriana fauriei extract and fractions on hydrogen peroxide-induced neuronal cell damage are studied. Methods and Results : Oxidative stress plays an important role in the pathological process of neurodegenerative diseases. Valeriana fauriei extract (VFE) and EA fractions (VFEA) was investigated total phenolic contents using method. VFE of total phenolic contents had 2.54 ± 0.01 mg/g, also, VFEA had a 18.78 ± 0.03 mg/g. High phenolic content of the VFEA is expected to better the inhibition of oxidative stress. VFE and VFEA were experimented to inhibit ROS induced 200 μM 3-morpholinosydnonimine (SIN-1). VFE of inhibit SIN-1 induced-ROS dose dependently and signficantly. In addition, VFEA inhibition was also dose dependant and significant. Moreover, The treatment of SH-SY5Y and SK-N-SH cells with VFEA significantly reduced hydrogen peroxide-induced generation of intercellular ROS. Conclusion : From the above results, we may suggest that VFEA might have useful as a material for functional food and pharmaceutics for the pathological process of neurodegenerative diseases.
        222.
        2017.03 KCI 등재 서비스 종료(열람 제한)
        Being a rare form of sentence formation, not many languages seem to have Tag question constructions as English does (Culicover 1992:193). Besides, Cuenca (1997:4) notes that the English Tag question construction has received less and less attention in the later period of generative syntax, due to the colloquial characteristics of the construction. Of the two major distinct approaches to English Tag question constructions including Mono-clausal approaches such as Klima (1964), Arbini (1969), and den Dikkien (1995), and bi-clausal approaches such as Huddleston (1969), Culicover (1992), McCawley (1998), and Sailor (2009), the current paper proposes a Minimalist approach to Tag Question Construction using a series of Head movement, Focalization of vP, a Polarity reversing functional projection, PolP, which contains an abstract morpheme [NEG], and adjunction mechanism. Through these thorough and meticulous steps, the English Tag question construction receives a Minimalist facelift.
        223.
        2016.10 KCI 등재 서비스 종료(열람 제한)
        A monitoring system for a field magnetometer was configured with assistance of a Raspberry Pi as a data logger. The suggested geomagnetic system uses a semi-real-time data transmission module. The system consists of two parts: a field-observation part and a data-center part. The field-observation part comprises a Raspberry Pi, magnetometer, LTE router, and power source, while the data center part takes samples at the site. The collected magnetometer data are then sent to the data center through the LTE router. The newly designed monitoring system was deployed and checked in Jeju-do island, and found to operate stably. The suggested system is promising in that it is simple and cost saving, providing at least physical insight and knowledge on the complex natural phenomena.
        224.
        2016.10 서비스 종료(열람 제한)
        Background : Schizandra chinensis Baillon have five tastes and lately it is using a beverage broadly. Schizandra chinensis is one of the top producing medicinal plant in Korea. Mungyeong of Gyongbuk province produce almost of Schizandra chinensis. Maturity of Schizandra chinensis get 3 years and proliferation of Schizandra chinensis was not a manual. It is needed that a new cultivar has a big fruit and high quality chracteristics using processed food and beverage. Methods and Results : 105 lines of Schizandra chinensis were collected on Mungyeong, Yeongwol, Jinan. It were studied it’ characteristics especially it’s fruit trait. Fruit traits of Schizandra chinensis were researched on fruit length, fruit weight, maturity, number of fruit, male and female ratio, powdery mildew. Fruit length of Schizandra chinensis is relation of fruit weight. It were founded 15 lines of long fruit length. 5 lines were studied high fruit weight and it’s weight were 32 to 41g. Number of fruit has relation with fruit weight and high fruit weight gets many fruits. it’s numer of fruits were 3 to 41. Male and female ratio were very impotant characteristic. High level of female ratio has quantity of fruit. High level of female ratio were founded 2 lines. Finally It was selected 3 good breed lines of Schizandra chinensis. Conclusion : 105 lines of Schizandra chinensis Baillons were collected on Mungyeong, Yeongwol, Jinan. It were founded 15 lines of long fruit length and 5 lines were studied high fruit weight. High level of female ratio were founded 2 lines. 3 good breed lines of Schizandra chinensis were selected.
        225.
        2016.09 KCI 등재 서비스 종료(열람 제한)
        In this study, we investigated the characteristics of CCK-producing cells and mucus-secreting goblet cells with respect to stomach fish and stomachless fish of the Gobiidae in order to provide a basis for understanding the digestive physiology. Hairychin goby (Sagamia geneionema), which is stomachless fish, the numbers of mucus-secreting goblet cells is highest in the posterior intestine portion (P<0.05), while CCK-producing cells are scattered throughout the intestine. Gluttonous goby (Chasmichthys gulosus), which is stomach fish, mucus-secreting goblet cells are most abundant in the mid intestine portion (P<0.05), whereas CCK-producing cells are observed only in the anterior and mid intestine portion. Trident goby (Tridentiger obscurus) which is stomach fish, mucus-secreting goblet cells were most abundant in the mid intestine portion (P<0.05). CCK-producing cells are found in the anterior and mid intestine portion. Giurine goby, Rhinogobius giurinus which is also stomach fish, the largest number of mucus-secreting goblet cells showed in anterior intestine portion except for esophagus (P<0.05). CCK-producing cells are present only in the anterior and mid intestine portion. In S. geneionema, digestive action occurs in the posterior intestine portion to protect and functions to activate digestion. In contrast, in C. gulosus, T. obscurus and R. giurinus, their digestive action occurs in the anterior and mid intestine portion to protect and functions to activate digestion. Further studies of the modes of food ingestion by these fish, the contents of their digestive tracts, and the staining characteristics of the goblet cells need to be carried out.
        226.
        2016.09 서비스 종료(열람 제한)
        Micrococcus lutus is common gram-positive aerobic cocci present in soil, water, dust, and the skin of humans and animals. A 72-year-old man was admitted to the hospital with a complaint of abdominal pain and a turbid peritoneal dialysate. He was empirically treated with intraperitoneal (IP) cefazolin and ceftazidime. Seven day after admission, Gaffkya species was identified from the peritoneal effluent. He was treated with same organism one month ago and discharged with the dialysis catheter intact. So, we suspected that organism is true pathogen, and identified M. luteus by culture. We changed the antibiotics to cefoxitin, which were given for the total of 14 days. This is the first report of relapsing peritonitis by M. luteus and successful treatment without catheter removal.
        227.
        2016.03 KCI 등재 서비스 종료(열람 제한)
        In fish, light (photoperiod, intensity and spectra) is main regulator in many physiological actions including growth. We investigate the effect of light spectra on the somatic growth and growth-related gene expression in the rearing tiger puffer. Fish was reared under different light spectra (blue, green and red) for 8 weeks. Fish body weight and total length were promoted when reared under green light condition than red light condition. Expression of somatostatins (ss1 and ss2) in brain were showed higher expression under red light condition than green light condition. The ss3 mRNA was observed only higher expression in blue light condition. Expression of growth hormone (gh) in pituitary was detected no different levels between experimental groups. However, the fish of green light condition group was showed more high weight gain and feed efficiency than other light condition groups. Our present results suggest that somatic growth of tiger puffer is induced under green light condition because of inhibiting ss mRNA expression in brain by effect of green wavelength.
        228.
        2016.02 KCI 등재 서비스 종료(열람 제한)
        Horticultural therapy (HT) is the engagement of a person in gardening related indoor activities by a trained professional to achieve specific treatment goals. It was effective as an alternative medicine and played an important role in rehabilitation of stroke patients, especially in psychological aspects. While the psychological benefit has been clearly demonstrated, the evidence of the physical benefit is insufficient. We report three stroke patients treated with HT and they were evaluated from the standpoint of physical, psychological, and cognitive outcomes. HT program consisted of 10 sessions during 2 weeks with 1 hour per session. The assessment of outcomes and positron emission tomography/computed tomography (PET/CT) were performed before and after treatment. Two patients showed improvements in physical and psychological aspects. But the other patient showed no outstanding outcome. These results suggest the possibility of HT as a complement to conventional occupational therapy.
        229.
        2015.12 KCI 등재 SCOPUS 서비스 종료(열람 제한)
        This study was performed in order to provide basic data for predicting the usefulness of Jicama (Pachyrhizus erosus) as a food raw material. The changes in the physicochemical properties of freeze-dried and hot air-dried Jicama were investigated and analyzed. The moisture content of raw Jicama was 81.84%. The crude protein, crude fat, crude ash and carbohydrate content of hot air-dried Jicama powder were 2.85, 0.79, 7.93 and 88.44%, while those of freeze-dried Jicama powder were 3.93, 0.83, 7.92 and 87.32%, respectively on dry basis. Regarding the color values, the lightness of freeze-dried Jicama (92.86) was higher than that of the hot air-dried Jicama (88.01), whereas the redness (-0.67) and yellowness (3.21) of freeze-dried Jicama were lower than those of the hot air-dried Jicama (0.43) and (11.96), respectively. The brown index was lower in the freeze-dried Jicama (0.029) than in hot air-dried Jicama (0.107). The total sugar content showed no significant differences between freeze (46.49 mg/g) and hot air-dried Jicama (45.11 mg/g). Finally, the amylose content was higher in freeze-dried Jicama (5.66%) than in hot air-dried Jicama (6.63%).
        230.
        2015.09 서비스 종료(열람 제한)
        Light characteristics are very specific in the aquatic environment. Fish vision and different light spectra perception are related to each species’ natural habit. Light is one of the main environmental conditions and can be easily manipulated in artificial rearing settings. Mucus-secreting goblet cells are the main regulators of digestion. In this study, we established whether the light spectrum (natural condition, full spectrum: green, 520 nm; red, 590 nm, and blue, 480 nm) influences growth performance and digestive activity related to mucus-secreting goblet cell activity in order to develop a good management protocol and optimal rearing system for nursery stage of Epinephelus akaara. For each light spectrum, fish (11.5 ± 0.2 g in mean initial body weight, 9.0 ± 0.1 cm mean initial total length) were reared 16 weeks under a flow-through system and fed commercial pellet diets twice daily. At the end of the experiment, the final body weights differed among the fish reared under different light spectra. The highest growth performance value and feed efficiency were observed in fish reared under the green light condition. Mucus-secreting goblet cell activity was significantly higher in the fish under green light condition than in the fish under the natural, red, and blue light conditions. Rearing of E. akaara under the green light condition had positive effects on fish growth performance and digestion. We recommend that the appropriate light spectrum for nursery stage of E. akaara is the green light condition from the perspective of growth performance and the synergistic effects of mucus-secreting goblet cells. However, longer light treatment periods are needed in future investigations to clarify the effects of light spectrum on each growing stage of E. akaara.
        233.
        2015.03 KCI 등재 서비스 종료(열람 제한)
        This study investigated possible involvement of photoperiodic regulation in reproductive endocrine system of female olive flounder. To investigate the influence on brain-pituitary axis in endocrine system by regulating photoperiod, compared expression level of Kisspeptin and sbGnRH mRNA in brain and FSH-β, LH-β and GH mRNA in pituitary before and after spawning. Photoperiod was treated natural photoperiod and long photoperiod (15L:9D) conditions from Aug. 2013 to Jun. 2014. Continuous long photoperiod treatment from Aug. (post-spawning phase) was inhibited gonadal development of female olive flounder. In natural photoperiod group, the Kiss2 expression level a significant declined in Mar. (spawning period). And also, FSH-β, LH-β and GH mRNA expression levels were increasing at this period. However, in long photoperiod group, hypothalamic Kiss2, FSH-β, LH-β and GH mRNA expression levels did not show any significant fluctuation. These results suggest that expression of hypothalamic Kiss2, GtH and GH in the pituitary would change in response to photoperiod and their possible involvement of photoperiodic regulation in reproductive endocrine system of the BPG axis.
        234.
        2014.09 서비스 종료(열람 제한)
        Chemoresistance is one of the main problems to treat different kinds of cancers or cancer cells. Therefore, it is necessary to find out the strategies to make the cancer cells sensitive to chemotherapy along with optimal dosage of drugs. We examined sensitivity of MCF7 cells through pretreating with an epigenetic modulator, azacytidine (AzaC) to doxorubicin (Dox). The cells were treated with 5 and 10 mM of AzaC for a week, subsequently with 50, 100 and 500 nM of doxorubicin for 24 and 48h. It was found that pretreatment of AzaC significantly enhance the sensitivity of MCF7 cells to Dox, inducing cell death. After 24h 15% cells underwent apoptosis in 500 nM dox treatment group while 23.4% cells death occurred in AzaC pre treatment group. After 48h MCF7 cells treated with Dox showed 19.0% cell death while AzaC sensitized cells showed 50.0% cells death when exposed to 500 nM of Dox for 48h. Western blot analysis showed the upregulations in the expression of bax, caspase-3, caspase-9 and p53 in AzaC-sensitized MCF7 cells treated with Dox as compared to those treated with only Dox. There was no clear indication for pro-apoptosis genes in the cells treated with individual drugs. These results showed that pretreatment with the epigenetic modulator significantly increased the sensitivity of MCF7 cells to Dox. Therefore it is concluded that demethylation event might enhance the activity of DNA intercalating agents to induce DNA damage in breast cancer cells.
        235.
        2014.09 서비스 종료(열람 제한)
        Melatonin has several known physiological functions, the main one being synchronization of daily and seasonal rhythms. In addition, melatonin has been reported to influence reproduction and behavioral rhythms with varying results depending on the species. To date, it remains unknown how this rhythm in locomotor activity is controlled endogenously, although there must be coordination of chemical and molecular drivers. However, the species is poorly characterized at molecular level with little sequence information available in public databases. The aim of study was to clarify involvement of endogenous melatonin rhythms and locomotor activity in day-night activity of the eel, Anguilla japonica which is an economically important but endangered species. The levels during daytime (zeitgeber time; ZT 6) were significantly (P<0.05) lower than those during nighttime (ZT 18). A similar pattern was persisted under DD conditions, whereas it disappeared under LL conditions and ocular melatonin levels remained low. Therefore, it is likely that ocular melatonin levels of the nocturnal eel reared under LD and DD conditions fluctuate in a daily/circadian manner and night-related physiological processes are dependent on eel locomotor activities which is a nocturnal species. We found that similar number of genes were differentially expressed between day (ZT6) and nighttime (ZT18), suggesting that during the nighttime also important in differential gene expression with daytime. This work also provides essential information for further studies investigating the molecular basis of daily/circadian system in this species.
        236.
        2014.09 서비스 종료(열람 제한)
        As a preliminary investigation into the effect of environmental factors control for gonadal development, we examined the involvement of photoperiod and water temperature in ovarian development of Epinephelus. akaara. For the induction of sexual maturation, E. akaara reared in recirculating aquaculture system (RAS). During November 2013, the photoperiod and water temperature was adjusted to 12L:12D and 18℃, respectively. In the photo-thermal treatment group, every 3 weeks daylight was increased as follows a 13L:11D and 14L:10D, and control group was maintained under natural condition. After 9 weeks, water temperature was increased 23℃ in photo-thermal treatment group. The sampled fish every 3 weeks revealed increase in gonadosomatic index (GSI; 5.18±1.38), oocyte diameter and vitellogenic oocytes (423.9±36.1 ㎛) were observed in gonads 12 weeks under photo-thermal treatment group. However, ovarian development was maintained immature stage in control group. In this environmental factors manipulation trial, seventy one of the 95 females (578.4 ± 25.4 g in mean body weight, 31.0 ± 0.5 cm mean total length) treated with HCG injection (doses 500 IU/kg BW) were induced ovulation by artificial stripping. The total volume of ovulated eggs were 3,470 ml and the total volume of fertilized eggs was 3,295 ml. The fertilization rate and hatching rate were 95% and 98%, respectively. These results suggest that the photoperiod as well as water temperature are major environmental factors in triggering the gonadal development of E. akaara.
        237.
        2014.09 서비스 종료(열람 제한)
        We investigated the change mRNA expression of GtHs subunits (FSHβ, LHβ) in the pituitary, androgen receptor (AR), estrogen receptor (ERα) in gonad and histological observation of gonads in longthooth grouper Epinephelus bruneus by treatment Femara, an aromatase inhibitor (AI). Longtooth grouper (body weight 408±43.1 g; one year) cultured in Future Aquaculture Research Center, NFRDI were used in the experiments. The experiment was conducted for 12 weeks from 21 August 2013. Fish received intramuscular injection of AI at 5 mg/g BW dose in three times every 3 weeks. Fish were sampled pituitary and gonads at 3, 6, 12 weeks post-injection (n=50). The mRNA levels of FSH-β, LH-β in pituitary and AR, ERα mRNA in gonad were evaluated using qRT-PCR and qPCR. The histological change of gonads observed on light microscope. The gonads of control group contained most perinucleolus oocyte. At 3 to 6 weeks post-injection, the gonads of AI-treated group contained a few degenerated oocytes, spermatogonia and spermatocytes. At 12 weeks post-injection, gonads contained spermatids undergoing spermatogenesis. From 6 to 12 weeks post-injection, the expression level of GtHs subunits mRNA in pituitary was significantly higher than control group. The expression level of AR mRNA in gonad was higher than control group from 3 to 12 weeks post-injection. The expression level of ERα mRNA in gonad was lower than control group from 6 to 12 weeks post-injection. These results suggest that immature longtooth grouper with AI treatment induced masculinization via change of GtH subunits in pituitary, AR and ERα mRNA in gonad.
        238.
        2014.07 서비스 종료(열람 제한)
        UVB radiation which causes dermatosis, cancroid, and necrosis in living organisms is mostly absorbed by ozone layer, resulting in transmission of only small UVB proportion to earth surface. Recently, however, rapid increases of pollutants like CFCs have accelerated depletion of stratospheric ozone layer. Increased UVB irradiation alters affects biomolecule interinity such as DNA, RNA and protein. To understand DNA mutation spectra in response to UVB, in the present study, we used two soybean cultivars, Buseok and Cheongja 3, which were screened as the most UVB tolerant and sensitive genotypes among 140 soybean germplasms, respectively. Whole genomes of Buseok and Cheongja were sequenced at low-coverage depth by illumina Hiseq2000, and we also sequenced 6 hr UVB irradiated genomes of two cultivars. Raw sequence reads were aligned to the soybean reference sequences (cv. Williams 82) by BWA aligner software. To identify DNA mutations induced by UV-B irradiation, multiple comparisons between non-irradiated and irradiated genomes in these two soybean genotypes were conducted using samtools and GenomeAnalyzerTK packages and homebrew python codes. A total, 13,992 and 17,078 single nucleotide polymorphisms (SNPs) were indentified between non-irradiated and irradiated genomes of Buseok and Cheongja 3, respectively. In addition, Buseok and Cheongja 3 have 423 and 465 insertions/deletions induced by UVB, respectively. Approximately 58% of the identified SNPs were C to T or CC to TT transversions, consistent with the previous studies. Chromosomal distributions of the SNPs likely showed differences in UV-B mutation positions depending on the soybean genotype
        239.
        2014.07 서비스 종료(열람 제한)
        Mungbean (Vigna radiata) is a fast-growing, warm-season legume crop that is primarily cultivated in developing countries of Asia. We constructed a draft genome sequence of mungbean to facilitate genome research into the subgenus Ceratotropis and to enable a better understanding of the evolution of leguminous species. The draft genome sequence covers 80% of the estimated genome, of which 50.1% consists of repetitive sequences. In total, 22,427 high confidence protein-coding genes were predicted. Based on the de novo assembly of additional wild mungbean species, the divergence of what was eventually domesticated and the sampled wild mungbean species appears to have predated domestication. Moreover, the de novo assembly of a tetraploid Vigna species (Vigna reflexo-pilosa var. glabra) provided genomic evidence of a recent allopolyploid event. To further study speciation, we compared de novo RNA-seq assemblies of 22 accessions of 18 Vigna species and protein sets of Glycine max and Cajanus cajan. The species tree was constructed by a Bayesian Markov chain Monte Carlo method using highly confident orthologs shared by all 24 accessions. The present assembly of V. radiata var. radiata will facilitate genome research and accelerate molecular breeding of the subgenus Ceratotropis.
        240.
        2013.12 서비스 종료(열람 제한)
        Neutropenic enterocolitis (NE), the most serious gastrointestinal complication, has been reported as a clinical syndrome that occurs in the setting of disease- or chemotherapy-induced neutropenia. Complications of NE include bowel necrosis with perforation, fistula, stenosis, massive bleeding, abscess formation, and pneumatosis intestinalis (PI). Most physicians recommend initial conservative management with bowel rest, intravenous fluids, total parenteral nutrition, broad-spectrum antibiotics, and normalization of neutrophil counts. Surgical intervention is recommended in the event of obstruction, perforation, persistent gastrointestinal bleeding despite correction of thrombocytopenia and coagulopathy, or clinical deterioration. We experienced a patient whose abdominal computed tomography scan showed pneumoretroperitoneum, intramural gas in the colon, and inferior vena caval gas. Her condition improved after treatment with granulocyte colony-stimulating factor and broad-spectrum antibiotics. We report on this case along with a review of the literature.