Avian pathogenic Escherichia coli (APEC) causes a number of extraintestinal diseases in poultry. A virulence factor, P-fimbriae is firmly associated with the diseases. In this study, to develop an effective vaccine for the prevention of APEC, recombinant attenuatted Salmonella Typhimurium vaccines expressing PapA and PapG of P-fimbriae were evaluated whether these induced protective immune responses in murine models. Female BALB/c mice were primed and boosted orally at 7 and 10 weeks of age. In all immunized mice, the antigen-specific serum IgG levels were remained higher than those in the control mice from the fourth week post inoculation till the end of this study. In addition, antigen-specific serum IgG levels in the prime-booster immunized mice were enhanced as compared to the single immunized mice among each immunized group. The antigen-specific mucosal IgA levels in the mice immunized with each strain also induced higher than those in control mice. In addition, serum IgG and fecal IgA levels in mice administered with the combination of both strains were highly induced compared to those in mice immunized with each strain alone. These results indicated that PapA and PapG worked together for inducing high immune responses. To partly discern the nature of immunity induced by the strains, we quantified serum IgG subtypes IgG1 and IgG2a specific to antigens. The PapA and PapG strains biased the immunity to the Th1-type, as determined by the IgG2a/IgG1 ratio. On the other hand, the immunization with the both strains in combination produced mixed Th1- and Th2-type immune responses. These indicated that immunization with the combination of PapA and PapG could elicit both humoral and cell-mediated immunities.
Kim, Yong-Ki;Lee, Sang-Bum;Lee, Sang-Seob;Shim, Hong-Sik;Choi, Inn-Hoo
The Korean Journal of Pesticide Science
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v.7
no.2
/
pp.139-148
/
2003
The purpose of this study was to investigate damages of garlics occurred under cold storage and farmhouse storage condition, influence of cultural and environmental factors on storage spoilage of garlics, and to establish control strategies to reduce damages occurred under storage of garlics. Decays of garlics were highly related with cultural condition (paddy field or upland soil), ventilation, storage temperature and relative humidity, continuous cropping years, and harvesting stage. Early-harvested garlics were more decayed than late-harvested garlics. Garlics cultivated on paddy field were less decayed than ones cultivated on upland soil under farmhouse storage condition. The densities of Penicillium spp. and Fusarium spp. were higher on plot with long term continuous cropping cultivation history than on plot with short term continuous cropping cultivation history. However there is no relation between continuous cropping years and percent of decay of garlics. As a result of investigating influence of environmental factors on decay of garlics, P. hirsutum caused severe spoilage under high relative humidity condition, while F. oxysporum and Stemphyllium botryosum were not related with relative humidity. The three postharvest pathogens grew well above woe. In addition when P. hirsutum and S. botryosum were cultured for two months, they grew even at $-1^{\circ}C$. Except for environmental factors, wounds occurred through farming works. had an effect on storage spoilage of garlics. Garlics only hurt with a toothpick without inoculation of pathogens were decayed more severe than those inoculated with pathogens without wounds. Seven agro-chemicals showed highly suppressive effect were selected by measuring mycelial growth of three major pathogens of garlics on potato dextrose agar amended with 0.1% (v/v) of each fungicide. When they were foliar-sprayed on garlics 30 days before harvesting, it was confirmed that they suppressed storage spoilage of garlics. Also when garlics were sprayed with and drenched into the suspension of Benoram WP very after harvesting garlics, garlic damages by postharvest pathogens were reduced remarkably.
The activities of pectolytic and cellulolytic enzymes produced from slices of ginseng root infected with Cylindrocarpon destructains(Zins.) Scholtern were proportional to each concentration and reaction time. Activities of cellulase(Cx), endo-polygalacturonase(endo-PG), endo-polymethylg-alacturonase(endo-PMG), exo-polygalacturonase(exe-PG), and exe-polymethylgalacturonase(exo-PMG) were maximum on the 4th day after inoculation. No endo-PG and endo-PMG were detected at the first and second days, while exo-PG exo-PMG were active. On the 6th day, all pectic enzymes were completely lost, whereas Cx remained at a high concentration. pH optima of Cx, endo-PG, endo-PMG, exo-PG, and exo-PMG were 6.0, 5.5, 8.0, 7.0 to 7.5, and 8.5, respectively. Temperature optima of Cx, endo-PG, endo-PMG exo-PG, and exo-PMG were $66^{\circ}C\;53^{\circ}C\;41^{\circ}C\;37^{\circ}C\;and\;40^{\circ}C$, respectively. Cx was only inhibited by $0.05M\; Hg^{++}$ among 16 ions tested. Inhibitory effects of ions on pectolytic enzymes varied, however$M Fe^{+++}\;and\;0.05M\;Al^{+++}$ were the best in general. Among 8 fungicides, none of them inhibited all the enzymes studied at $0.1\%$, active ingredients. Exo-PG were highly inhibited by all of the fungicides, of which difolatan was the most inhibitory to all the pectic enzymes. $Ca^{++}\; at\; 0.02M\; and\;Fe^{+++}\;at\;0.02M$ completely inhibited all the pectolytic enzymes, and Cx was inhibited $30\%$ and $70\%$ at the same concentration, respectively Formalin almost inhibited exo-PG and exe-PMG at $0.8\%$ but not the other enzymes especially Cx. Difolatan at $0.8\%$ inhibited all the enzymes concerned above $80\%$. The cellulolytic and pectolytic enzymes of C. destructans must be closely associated with the ginseng root rot and should be inhibited to control the disease effectively.
Rhee, Young Kyoung;Nam, So-Hyun;Kim, Hye-Ryun;Cho, Chang-Won;Lee, Young-Chul;Kim, Young-Chan;Hong, Hee-Do
Journal of the Korean Society of Food Science and Nutrition
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v.43
no.12
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pp.1835-1842
/
2014
Various microorganisms are involved in the fermentation of Mageoli, Korean traditional liquor. Among them, the most predominant microorganism is yeast, including Saccharomyces cerevisae. This study investigated the effects of crude polysaccharides separated from Mageoli mash (CP-M) on activation of peritoneal macrophages in cell culture medium. Four types of yeasts, S. cerevisae 89-1-1, 98-2, 268-3, and 113-4, were used. When peritoneal macrophages were treated with $10{\mu}g/mL$ of CP-M fermented with S. cerevisae 113-4, the concentration of nitric oxide (NO) in the medium was highest ($33.3{\mu}M$). The concentrations of IL-6 and -12 were also highest at 116.3 pg/mL and 59.8 pg/mL, respectively. In the case of CP-M cultured at 15, 20, and $30^{\circ}C$ after inoculation with S. cerevisae 113-4 and fermented at different temperatures, production of NO and IL-6 by peritoneal macrophages did not change compared to the control. For CP-M obtained after fermentation at $25^{\circ}C$, however, NO concentration increased 2.7~3.3 fold and IL-6 concentration by 5.7 fold compared to the control. Furthermore, the effect of fermentation period on expression of CP-M functionality was examined. NO production by CP-M of the 5th day mash was highest, increasing 2.2 fold compared to 0-day CP-M. However, there were no significant differences in concentration of IL-6 or -12 according to different fermentation periods, although CP-M showed a large decrease after 10 days. The results show that fermentation conditions with the highest activity were observed in CP-M inoculated with S. cerevisae 113-4 and fermented at $25^{\circ}C$ for 5 days. CP-M consisted of 78.6% neutral sugar, 11.6% acidic polysaccharide, and 9.8% protein. In particular, the sugar composition of neutral sugar consisted of mannose (47.8%), glucose (29.6%), and galactose (12.7%). Based on the results, CP-M is assumed to be an extracellular polysaccharide originating in yeast with high mannose content.
Journal of the Korean Society of Food Science and Nutrition
/
v.43
no.1
/
pp.135-140
/
2014
Pre-storage ultra-violet (UV) light treatment on fresh produce is known to inactivate the contaminated microorganisms, activate the defense system, and delay ripening extending the shelf life. As UV light emitting diode (LED) becomes available at a relatively low price, continuous or intermittent UV treatment during chilled storage is possible in a container or package. This study attempted an in situ UV LED treatment on fresh produce stored under a refrigerated container in order to see its potential in the fresh produce storage and further optimize its application conditions. The effect of in-container UV LED irradiation on the quality preservation of shredded carrots was investigated in the air and modified atmosphere (MA) conditions. Two sets of experiment with Escherichia coli inoculation and with natural microbial flora in the air (two 30 minute on-off cycles of 1 $diode/dm^2$ per day at a location above 2 cm) showed a clear and significant effect of the UV LED irradiation on the suppression of microbial growth: 280 nm was the most effective by maintaining a lower microbial count by at least 0.5 log (CFU/g) throughout the 6 day storage period. The carotenoids content of shredded carrots subjected to UV LED treatment at 365 and 405 nm in the air was higher than that of the control shredded carrots. In MA condition of $O_2$ of 1.2~4.3% and $CO_2$ of 8.4~10.6% being indifferent with LED wavelengths, 280 nm UV LED irradiation was also effective in inhibiting the microbial growth. While there was no observed difference in the carotenoids content between untreated and UV LED-treated shredded carrots in MA, UV LED irradiation at 365 and 405 nm was slightly better in DPPH radical scavenging activity. The use of UV LED in storage container or package seems to give the benefits of preserving the microbial and nutritional qualities of minimally processed fruits and vegetables.
Effect on blast lesion development was investigated in rice cultivar Milyang 23 and Jinheung using two races of Pyricularia oryzae compatible or incompatible to each of two rice cultivars. Discase lesions were measured in rice when inoculated with inoculum mixed with compatible and incompatible races, inoculated with a compatible race following with an incompatible race and vice versa. Lesions were smaller when rice was incoulated with an incompatible race and then inoculated with a compatible race than those inoculated in the reverse way both at the inoculated site and at 3cm-upper part from inoculated spot. The results suggested that induced resistance might play a role in suppression of lesion development although such an effect appeared to be influenced by heavy application of nitrogen fertilizer.
Through the laboratory and vinyl house experiments, the effects of inoculum density, plant age and temperature on the incidence of Phytophthora crown rot of pepper (Capsicum annum L.) were investigated. The propagule survival was greater in the natural soil than in autoclaved soil within first 2 weeks when the sporangial suspension of the pathogenic fungus was incorporated into soil, thereafter the survivability reduced rapidly. The propagule was not detectable in 35 days by means of Papavizas selective medium neither in natural nor in autoclaved soil. At least 5 sporangia per gram soil were required to induce crown rot for 30 days old pepper seedlings. Further increase in inoculum concentration above this threshold level resulted in higher disease incidence and shorter incubation period. When the same amount of inoculum was infested, higher disease incidence was observed for younger plants until 3 weeks after inoculation. On the other hand after 4 weeks this tendency was not extended any more. Younger plants were recognized as having shorter incubation period upon infection, however, the days from first symptom appearance to complete death were not significantly different among differently aged seedlings. Exposure of inoculated pepper seedlings to $25^{\circ}C$ resulted in highest infection rates and followed by those to $30^{\circ}C\;and\;20^{\circ}C$ but no disease was found at $15^{\circ}C\;and\;35^{\circ}C$ for 10 days. When the plants previously incubated at different temperature for 10 days were moved to $25^{\circ}C$ room temperature, prior exposure to $20^{\circ}C\;and\;30^{\circ}C$ brought continuous disease development. Even those plants preincubated at $15^{\circ}C$ were diseased up to 50%. But the prior exposure to $35^{\circ}C$ induced no symptom developed, indicating no seedlings infected at all.
Kim, Young-Ho;Jhune, Chang-Sung;Park, Soo-Chul;You, Chang-Hyun;Sung, Jae-Mo;Kong, Won-Sik
Journal of Mushroom
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v.7
no.3
/
pp.115-121
/
2009
Recently sawdust cultivation of Shiitake mushroom (Lentinula edodes ) is getting increased because log cultivation is getting difficult to get oak logs. It is important to make mycelia browning on the substrate surface in sawdust cultivation. This browned surface plays an important role like as artificial bark of the oak log, which protects the other pests and suppresses water evaporation in the substrate. The period for mycelia browning is so long that the sawdust cultivation of Shiitake mushroom can not spread well into the mushroom farms. In this article we would like to discuss about the effect of environmental condition to the mycelial browning during sawdust bag cultivation for the To reduce the period required for browning of substrates, sawdust substrates was illuminated light with difference intensity. One hundred Lux light illumination was needed for producing normal yield of fruit body but fruit body yield was low and abnormally shaped fruit body was produced when cultured under the dark condition of incubation. Illumination over 200lux is necessary for the successful browning of substrates during incubation. Optimum incubation temperature for browning of substrates and fruiting was $25^{\circ}C$. The treatment of cotton plug with different size to identify the effect of aeration on the browning of substrates and fruiting showed rapid mycelial growth and reduced the periods for browning as the size of cotton plug was bigger. However, yield of fruit body was the highest at 16mm diameter cotton plug as compared to 20mm of that. $CO_2$ content in vessel of substrates was low as the size of cotton plug was bigger during incubation. $CO_2$ content during incubation of substrate was highest in periods between 8 week and 14 week after inoculation of shiitake when substrate was changed color into brown. $C_2H_4$ content in vessel with substrates was highest at 8mm diameter cotton plug and it was increased by order of 12, 16, 20, 0, 4 mm diameter cotton plug during substrate incubation. Sawdust substrate was soaked in cold water for different time to identify soaking effect of sawdust substrate on fruit body yield and activities of enzymes in these substrates were investigated. The fruit body yield was increased up to 40% by soaking substrates in comparison with unsoaked substrates. The soaked substrates showed 165, 175g/1,000ml at treatment of 4 and 15 hours, respectively. Cellulose activities in soaked substrates were not changed with soaking time, but activities of laccase, lignin degradation enzyme, were drastically increased up to 4 times in comparison with unsoaked substrates.
This study was carried out to investigate the artificial cultivation of Pleurotus eryngii on the optimal medium vessel, periods of cultivation and the optimal method of pinheading for both yield and quality of fruiting body were also performed. The optimal composition of sawdust medium in polypropylene(PP) bottle was combination of sawdust(70%) and corncob(30%) but increased amount of corncob delayed the period of mycelial growth. The mycelial growth and the yield of fruiting body in the medium with beat pulp were worse than that without beat pulp. The optimal composition of nutrients for both yield and quality of fruit body tuned out to be a combination of rice bran(12%), wheat bran(12%) and cottonseed cake(6%). Additions of zeolite, shell lime and bean curd dregs were not effective in mycelial growth and yield of fruit body. When testing size of PP bottle for cultivation, the larger of bottle mouth is, the more pinheading number found, but the number of available fruit body is not significantly different. The culture in $1100\;ml-{\phi}75\;mm$ bottle is the best in the yield and quality of fruit body than those in $555\;ml-{\phi}50\;mm,\;850\;ml-{\phi}58\;mm,\;850\;ml-{\phi}65\;mm\;and\;1100\;ml-{\phi}65\;mm$ bottle. Using the PP bag for cultivation, a square shaped bag was better than a round shaped and black square shaped in mycelial growth and yield of fruit body. The most suitable period of incubation was 35 days after inoculation at $22{\pm}2^{\circ}C$. When the incubation periods was decreased less than 35 days, the pileus formation and yields were very bad but a pinheading condition looked similar, For an optimal pinheading, turning upside down was better than standing and covering.
Lee, Mun Haeng;Lee, Hee Kyoung;Kim, Sung Eun;Lee, Hwan Gu;Lee, Sun Gye;Yu, Seung Hun;Kim, Young Shik;Kim, Sang Woo;Lee, Youn Su
The Korean Journal of Mycology
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v.41
no.3
/
pp.172-180
/
2013
Grey mold infection rate in tomato was investigated with the inoculation of dead flowers on Botrytis selective media. The grey mold infection rate of flower after fruiting were higher in the order of after 45 days, after 25 days, and fruiting day with 100%, 87% and 65%, respectively. The number of infected flowers were increased with time increase after the flowering before fruiting. BSM (Botrytis selective medium) was used to check grey mold infection rate depending on the flowering stage and cultivar. Grey mold infection rate depending on the flowering stage was similar in all the beef-tomato cultivar as 1.5~5% at preflowering, 1.5~45% at flowering and 75~90% at fruiting. On the other hand, cherry tomato cultivar "KoKo" had lower infection rates of 0~3.5% at pre-flowering, 10~30% at flowering and 20~50% at fruiting. These resulted from the fact that beaf-tomato cultivar have much bigger flowers and larger amount of pollens compared to those of cherry tomato cultivar. The amounts of falling pollens of Botrytis spp. were checked for beaf-tomato cultivar and cherry tomato cultivar using BSTM. The amounts of falling pollens were increased as growth period was extended, and the amount of spores increased rapidly during the outbreak of grey mold. Twelve field trials in Buyeo and Iksan areas showed that Fluazinam, and Diethofencarb+Carbendazim were effective fungicides to control tomato grey mold, and these results were similar to those of field trials with BSTM. This is the first report of Fluazinam as a effective fungicide for the control of grey mold of tomato even though it has not been registered yet for the control of gray mold in tomato.
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