The existing QoS mechanisms for video streaming are short of the consideration for various user environments and the characteristic of streaming applying programs. In order to overwhelm this problem, studies on the video streaming protocols exploiting scalable video coding (SVC), which provide spatial, temporal, and qualitative scalability in video coding, are progressing actively. However, these protocols also have the problem to deepen network congestion situation, and to lower fairness between other traffics, as they are not equipped with congestion control mechanisms. SVC based streaming protocols also have the problem to overlook the property of videos encoded in SVC, as the protocols transmit the streaming simply by extracting the bitstream which has the maximum bit rate within available bandwidth of a network. To solve these problems, this study suggests TCP-friendly network adaptive SVC streaming(T-NASS) protocol which considers both network status and SVC bitstream property. T-NASS protocol extracts the optimal SVC bitstream by calculating TCP-friendly transmission rate, and by perceiving the network status on the basis of packet loss rate and explicit congestion notification(ECN). Through the performance estimation using an ns-2 network simulator, this study identified T-NASS protocol extracts the optimal bitstream as it uses TCP-friendly transmission property and perceives the network status, and also identified the video image quality transmitted through T-NASS protocol is improved.
Objectives In the present study, the author intended to investigate whether bojung-ikgitang-gamibang(BJGB) and seonbang-paedoktang(SBPT) significantly affect in vivo and in vitro mucin secretion from airway epithelial cells. Methods In vivo experiment, mice's mucin which is on a hypersecretion of airway mucin, mice's tracheal goblet cells in hyperplasia and mice's intraepithelial mucosubstances were exposed with SO2for3weeks. Effects of orally-administered BJGB and SBPT during 1 week on vivo mucin secretion and hyperplasia of tracheal goblet cells were assessed by using both enzyme-linked immunosorbent assay(ELISA) and staining goblet cells with alcian blue. In vitro experiment, confluent hamster tracheal surface epithelial(HTSE) cells were metabolically radiolabeled with 3H-glucosamine for 24hrs and chased for 30 min in the presence of each agent to figure out the effectiveness of 3H-mucin secretion. Total elution profiles of control spent media and treatment sample through Sepharose CL-4B column were analyzed. The effects of each agent on contractility of isolated tracheal smooth muscle and effects of each agent on MUC5AC gene expression in cultured HTSE cells were investigated. Also, possible cytotoxicities of each agent were assessed by measuring lactate dehydrogenase(LDH) release. Additionally, effects of BJGB and SBPT on both MUC5AC gene expression in cultured HTSE cells and TNF- or EGF-induced MUC5AC gene expression in human airway epithelial cells (NCI-H292) were investigated. Results (1) BJGB and SBPT inhibited hypersecretion of in vivo mucin. SBPT also inhibited the increase the number of goblet cells. However, BJGB did not affect the increase of number of goblet cells; (2) BJGB significantly increased mucin secretion from cultured HTSE cells, without significant cytotoxicity, and chiefly affected the 'mucin' secretion; (3) SBPT did not affect mucin secretion from cultured HTSE cells without significant cytotoxicity, and also did not affect the secretion of the other releseable glycoproteins; (4) BJGB and SBPT did not affect Ach-induced contraction of isolated tracheal smooth muscle; (5) SBPT significantly inhibit the expression levels of MUC5AC gene and BJGB significantly increased the expression levels of MUC5AC gene in both HTSE cells and NCI-H292 cells. Conclusions BJGB and SBPT can not only affect the secretion of mucin but also affect the expression of mucin gene. The author suggests that the effects BJGB and SBPT with their components should be further investigated and it is highly desirable to find from oriental medical prescriptions, novel agents which might regulate hypersecretion of mucin from airway epithelial cells.
Objectives In the present study, the author intended to investigate whether Gamitonggyu-tang (GTT) significantly affects (since the subject is GTT, you need an 's') in vivo and in vitro mucin secretion from airway epithelial cells. Methods In vivo experiment, mice's mucin which is on a hypersecretion of an airway, mice's tracheal goblet cells in hyperplasia and mice's intraepithelial mucosubstances were exposed with SO2 for 3 weeks. Effects of orally-administered GTT for 1 week on in vivo mucin secretion and hyperplasia of tracheal goblet cells were assessed by using enzyme-linked immunosorbent assay (ELISA) and staining goblet cells with alcian blue. In vitro experiment, confluent hamster tracheal surface epithelial (HTSE) cells were metabolically radiolabeled with 3H-glucosamine for 24 hrs and chased for 30 min in the presence of GTT to figure out the effectiveness of 3H-mucin secretion. Total elution profiles of control spent media and treatment sample through Sepharose CL-4B column were analyzed.Possible cytotoxicities of each agent were assessed by measuring lactate dehydrogenase (LDH) release. Also, the effect of GTT on contractility of isolated tracheal smooth muscle was investigated. Results (1) GTT inhibited hypersecretion of in vivo mucin. However, it did not affect the increase the number of goblet cells (2) GTT significantly increased mucin release from cultured HTSE cells, without significant cytotoxicity (3) GTT chiefly affected the 'mucin' secretion and did not affect the secretion of the other releasable glycoproteins with less molecular weight than mucin (4) GTT did not affect Ach-induced contraction of isolated tracheal smooth muscle.Conclusions This result suggests that GTT can increase mucin secretion during short-term treatment (in vitro) whereas it can inihibit hypersecretion of mucin during long-term treatment (in vivo). The author suggests that the effect GTT with their components should be further investigated and it is valuable to find from oriental medical prescriptions, novel agents which might regulate mucin secretion from airway epithelial cells.
Journal of Physiology & Pathology in Korean Medicine
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v.19
no.2
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pp.416-425
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2005
This study demonstrated neuroprotective and anti-oxidative effects of Puerariae Radix for cerebral ischemia. Neuroprotective effects were studied by using oxygen/glucous deprivation of the organotypic hippocampal slice cultures to complement limitations of in vivo and in vitro models for cerebral ischemia study. Anti-oxidative effects were studied on BV-2 microglia cells damaged by $H_2O_2$ and nitric oxide. The results obtained are as follows; The groups treated with 0.5 and $5{\mu}g/m{\ell}$ of Puerariae Radix revealed significant decreases of neuronal cell death area and cell death area percentages in CA1 region of ischemic damaged hippocampus cultures during whole 48 hours of the experiment. The groups treated with 0.5 and $5{\mu}g/m{\ell}$ of Puerariae Radix revealed significant decreases of neuronal cell death area and cell death area percentages in DG region of ischemic damaged hippocampus cultures during whole 48 hours of the experiment. The groups treated with 0.5 and $5{\mu}g/m{\ell}$ of Puerariae Radix revealed significant decreases of TUNEL-positive cells in both CA1 region and DG region of ischemic damaged hippocampus cultures. The group treated with $50\;{\mu}g/m{\ell}$ of Puerariae Radix demonstrated significant decrease of TUNEL-positive cells in CA1 region. The groups treated with 0.5 and $5{\mu}g/m{\ell}$ of Puerariae Radix revealed significant decreases of LDH concentrations in culture media of ischemic damaged hippocampus cultures. The groups treated with 0.5 and $5{\mu}g/m{\ell}$ of Puerariae Radix revealed significant increases of cell viabilities of BV-2 microglia cells damaged by $H_2O_2$. The group treated with $5{\mu}g/m{\ell}$ of Puerariae Radix revealed significant increase of cell viability of BV-2 microglia cells damaged by nitric oxide. These results suggested that Puerariae Radix of cerebral ischemic revealed neuroprotective effects through the control effect of apoptosis and oxidative damages.
Journal of Physiology & Pathology in Korean Medicine
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v.20
no.1
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pp.69-75
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2006
In the present study, the author tried to investigate whether four oriental medical prescriptions named, jawan-chihyosan (CHS), gwaru-jisiltang (GJT), and several single compounds, kaempferol, coumarin, betaine and ursolic acid significantly affect mucin release from cultured hamster tracheal surface epithelial (HTSE) cells. Confluent HTSE cells were metabolically radiolabeled with 3H-glucosamine for 24 hrs and chased for 30 min in the presence of CHS, GJT, kaempferol, coumarin, betaine and ursolic acid, respectively, to assess the effect of each agent on 3H-mucin release. Possible cytotoxicities of each agent were assessed by measuring lactate dehydrogenase(LDH) release. Additionally, total elution profiles of control spent media and treatment sample (CHS and GJT) through Sepharose CL-4B column were analysed and effect of CHS and GJT on MUC5AC mRNA expression in cultured HTSE cells were investigated. The results were as follows : (1) CHS and GJT significantly stimulated mucin release from cultured HTSE cells, with significant cytotoxicity , (2) CHS and GJT chiefly stimulated the 'mucin' release and did not affect significantly the release of the other releasable glycoproteins with less molecular weight than mucin. This result suggests that the three herbal prescriptions specifically stimulate the release of mucin ; (3) CHS and GJT significantly increased the expression levels of MUC 5AC mRNA. This result suggests that the three herbal prescriptions can affect the synthesis of mucin at gene level in cultured HTSE cells ; (4) Kaempferol and coumarin did not affect mucin release, however, betaine and ursolic acid stimulated mucin release. All the agents did not show significant cytotoxicity. We suggest that the effects of CHS and GJT, betaine and ursolic acid should be further investigated and it is of great value to find, from oriental medical prescriptions, novel agents which have the effective expectorant or mucoregulative effect on mucin secretion from airway goblet cells.
Lilium cernum Komarvo. is an important endangered plant belonging to the family Liliaceae. A method was developed for the rapid micropropagation of L. cernum through plant regeneration from bulb scales explant-derived calli. The bulb scales segments were cultured on Murashige and Skoog (MS) medium supplemented with 0, 0.5, 1.0, $3.0mg{\cdot}L^{-1}$ kinetin and 0, 0.1, 0.5, $1.0mg{\cdot}L^{-1}$ NAA or 2,4-D for callus induction. In media with $0.5{\sim}3.0mg{\cdot}L^{-1}$ kinetin and $0.1{\sim}1.0mg{\cdot}L^{-1}$ NAA and 2,4-D, 95~100% of explants produced callus. They were then transferred to MS medium supplemented with various concentrations of NAA (0, 0.01, 0.05 and $1.0mg{\cdot}L^{-1}$) in combination with BA (0, 1.0 and $2.0mg{\cdot}L^{-1}$) for bulbet formation. Bulbet induction (78%), weight (468 mg) and size (15.5 mm) were obtained the highest on MS medium containing $2.0mg{\cdot}L^{-1}$ BA and $1.0mg{\cdot}L^{-1}$ NAA. In vitro frequency of plant regeneration was not significantly treated in strength of MS and sucrose concentration. Chlorophyll contents in 1/2MS with $50g{\cdot}L^{-1}$ sucrose treatments were higher than those in control and another treatment. This in vitro propagation protocol will be useful for conservation and mass propagation of this endangered plant.
Rapid and reliable identification of microorganisms is important to maintain food quality and to control safety. MALDI-TOF MS-based identification methods are relatively fast and simple compared to other conventional methods including gram staining and biochemical characterization. A colony on subcultured media can be directly prepared on the analysis plate without further complex treatments. In this study, we confirmed the applicability of MALDI-TOF MS-based identification of foodborne pathogens such as Salmonella Enteritidis/Typhimurium, Staphylococcus aureus, Vibrio parahaemolyticus, Clostridium perfringens, Listeria monocytogenes, Yersinia enterocolitica, Bacillus cereus, Campylobacter jejuni, Campylobacter coli, and Cronobacter sakazakii on the Korea Food Standard Codex. MALDI-TOF MS data of the pathogenic reference strains were incorporated into a commercial MicroID (ASTA Inc.) database. Other pathogenic reference strains and seven isolates from various food samples were correctly identified to the species level by using the MicroID database. In conclusion, MALDI-TOF MS is comparable with commercial biochemical identification.
The objective of the current study was to determine the cryoprotective effects of trehaolse on lactic acid bacteria in the frozen yoghurt during long-term frozen storage conditions. The frozen yoghurts were prepared using starter culture containing Lactobacillus bulgaricus and Streptococcus thermophilus, as well as trehalose and sorbitol as a cryoprotectant. The viable cell numbers of lactic acid bacteria in frozen yoghurt did not significantly decreased during six weeks frozen storage conditions. The MRS broth, which contains either trehalose or sorbitol, cultured with L. bulgaricus and/or S. thermophilus, and then the cultured medium was kept in the frozen condition for six weeks. The results indicated that lactic acid bacteria viability significantly increased with trehalose addition (2 and 5%) in the media compared to those of control and sorbitol supplement groups. The lactic acid bacteria viability in the yoghurts was examined on the effects of repeated freeze and thaw events. The freeze-thaw resistance of lactic acid bacteria significantly increased with trehalose supplement in the yoghurt. The major volatile aroma compounds (acetaldehyde, acetone, ethanol, diacetyl, and acetoin) in yoghurt were separated and indentified by headspace GC-FID analysis. Distinct flavor components and their ratios are known as important quality factors for yoghurt notes. Trehalose addition to the yoghurt was not influenced these factors during lactic acid fermentation. The results in this study demonstrated that trehalose potentially can be applicable as an effective cryoprotectant for lactic acid bacteria in the frozen yoghurt products.
Zhou, Jia;Yue, Shuangming;Xue, Benchu;Wang, Zhisheng;Wang, Lizhi;Peng, Quanhui;Xue, Bai
Journal of Animal Science and Technology
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v.63
no.5
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pp.1126-1141
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2021
Recent evidence has shown that methionine (Met) supplementation can improve milk protein synthesis under hyperthermia (which reduces milk production). To explore the mechanism by which milk protein synthesis is affected by Met supplementation under hyperthermia, mammary alveolar (MAC-T) cells were incubated at a hyperthermic temperature of 42℃ for 6 h in media with different concentrations of Met. While the control group (CON) contained a normal amino acid concentration profile (60 ㎍/mL of Met), the three treatment groups were supplemented with Met at concentrations of 10 ㎍/mL (MET70, 70 ㎍/mL of Met), 20 ㎍/mL (MET80, 80 ㎍/mL of Met), and 30 ㎍/mL (MET90,90 ㎍/mL of Met). Our results show that additional Met supplementation increases the mRNA and protein levels of BCL2 (B-cell lymphoma-2, an anti-apoptosis agent), and decreases the mRNA and protein levels of BAX (Bcl-2-associated X protein, a pro-apoptosis agent), especially at an additional supplementary concentration of 20 ㎍/mL (group Met80). Supplementation with higher concentrations of Met decreased the mRNA levels of Caspase-3 and Caspase-9, and increased protein levels of heat shock protein (HSP70). The total protein levels of the mechanistic target of rapamycin (mTOR) and the mTOR signalling pathway-related proteins, AKT, ribosomal protein S6 kinase B1 (RPS6KB1), and ribosomal protein S6 (RPS6), increased with increasing Met supplementation, and peaked at 80 ㎍/mL Met (group Met80). In addition, we also found that additional Met supplementation upregulated the gene expression of αS1-casein (CSN1S1), β-casein (CSN2), and the amino acid transporter genes SLC38A2, SLC38A3 which are known to be mTOR targets. Additional Met supplementation, however, had no effect on the gene expression of κ-casein (CSN3) and solute carrier family 34 member 2 (SLC34A2). Our results suggest that additional Met supplementation with 20 ㎍/mL may promote the synthesis of milk proteins in bovine mammary epithelial cells under hyperthermia by inhibiting apoptosis, activating the AKT-mTOR-RPS6KB1 signalling pathway, and regulating the entry of amino acids into these cells.
The purpose of this study is to analyze which group led the process of agenda setting of teacher's certification system in China from 1978 to 2018 using the Cobb & Elder's theoretical model. The period of about 40 years from 1978 to 2018 is divided into the introduction period of teacher's certification period (1978~1992), transition period (1993~1998), and stabilization stage (1999~2018). The agenda setting process was analyzed. As a result, the group that led the process of agenda setting of the Chinese teacher's certification system varied according to the period. The introduction period of teacher's certification system was analyzed as 'Inside Access Model' led by policy makers and government, and the transition period was confirmed as 'Mobilization Model' led by Chinese government and Ministry of Education. The stabilization period was analyzed as 'Outside Initiative Model' led by various groups such as mass media, researchers, and government. It was found that the process of agenda setting of teacher's certification system had been changing toward democratization according to the degree of development of Chinese society, and the quality control of teacher certifications had been strengthened.
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