• Korean Journal of Food Science and Technology
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• v.42 no.4
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• pp.481-487
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• 2010

The nutritional components, antioxidant, and neuroprotective effects of water and a 50% methanol extract from litchi fruit pericarp were investigated. The most abundant mineral, amino acid, and fatty acid were K, proline, and palmitic acid, respectively. In addition, the total water phenolics and 50% methanol extracts were 8.02 and 12.28 mg/g, respectively. The DPPH, ABTS radical scavenging activities and ferric reducing antioxidant power of the water and 50% methanol extracts showed dose-dependent antioxidant activity. In a cell viability assay using MTT, almost all extracts showed a protective effect against $H_2O_2$-induced neurotoxicity, and lactate dehydrogenase leakage was also inhibited by the pericarp extracts. In particular, the 50% methanol extract showed a higher cell membrane protective effect than the water extract at the highest concentration. Consequently, these data suggest that litchi fruit pericarp can be utilized as an effective and safe functional food substances for natural antioxidants and may reduce the risk of neurodegenerative disorders.

• The Korean Journal of Nuclear Medicine Technology
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• v.18 no.1
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• pp.98-103
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• 2014

Purpose: The effective half life of I-131 is useful to calculate radiation dose, period of hospitalization, and exposure dose of surrounding people from patient. However, it is difficult to measure. This study estimates the effective half life in whole body and thyroid in using of value of residual radioactivity obtained from the early and delay images of Dual time I-131 whole body scan. Also, the correlations between the effective half life and serum creatinine, GFR, and administration dose were investigated in this study. Materials and Methods: The targets were 50 patients administration high dose of I-131 from February to August in 2013, having normal range of serum creatinine and over $30{\mu}IU/mL$ of TSH levels. After administration radioactive I-131, the early scan in the 3rd day and the delay scan in the 5-6th days were performed. To measure the residual radioactivity in the whole body and thyroid, ROI was set and then background radioactivity was corrected to estimate. The effective half life was estimated by calculating the ratio of measured values between the early and delay images. To compare the effective half lives of the whole body and thyroid, it was analyzed by Independent t-test, and each correlation of the effective half life, GFR, serum creatinine, and the dose of administration were analyzed by calculating the pearson's correlation coefficient. All of the analysis were determined to be statistically significant when P<0.05. Results: The effective half life of the whole body was $17.06{\pm}5.50$ hours and of the thyroid was $17.22{\pm}5.41$ hours. The two effective half life did not show significant difference (P=0.887). As the value of GFR was increased, the effective half life of whole body (r=-0.407, P=0.003) and of thyroid (r=-0.473, P=0.001) were significantly decreased; as the value of serum creatinine was increased, the effective half life of whole body (r=0.309, P=0.029) and of thyroid (r=0.371, P=0.008) were significantly increased. In the administration dose, effective half life did not have correlations. Conclusion: The effective half life of I-131 of patients treated for their thyroids were estimated only by using the images of Dual time I-131 whole body scan. Also, the correlations with the effective life, GFR, and serum creatinine were examined. This study might be utilized for a study on optimization for the period of hospitalization of patients treated by high dose of I-131 and on evaluation for internal absorbed dose of MIRD schema in application of the effective half life.

• Journal of Korea Technology Innovation Society
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• v.10 no.4
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• pp.654-686
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• 2007

To estimate and analyze an interested science and technology level in any case requires three basic informations: (1) relative positions of our technology level, (2) other relevant technology level of the world best country holding the state of the art technology, and (3) its theoretical or practical maximum level within a certain period of time. Further, additional information from analyzing its respective rate of technology changes is necessary. It seems that most previous empirical or case studies on technology level have not considered third and fourth informations seriously, and thus critically have missed important findings from a dynamic point of view on the matter. A dynamic approach considering types of development processes and paths as well as current position needs an application of a concept of technology development stages and respective growth curves. This paper proposes a new method of approach and application by implementing relatively simple types of the growth curve(S-curve) such as logistic and Comports curves and applying estimation results of these curves to ten core technologies of the growth engines for the next future generation in Korea. The study implies that Korean science and technology level in general clearly gets higher as it approaches to a recent time of period, but relative technology gap from the world best in terms of catching-up period does not get better or narrower in case of at least part of the concerned technologies such as bio new drugs and human organs, and intelligence robots. The possibility does exist that some of our concerned technologies shooting for the next future generation may not come to the world highest level in the near future. The purpose of this study is to propose possibilities of catching-up, if any, by estimating its relevant type of growth pattern by way of measuring and analyzing technology level and by analyzing the technology development process through a position analysis. At this stage this study tries to introduce a new theoretical approach of estimating technology level and its application to existing case study results(data) from Korea Institute of Science and Technology Planning and Evaluation(KISTEP) and Korea Institute of Industrial Technology Evaluation and Planing(ITEP), for years of 2004 and 2006 respectively. The study has some limitations in terms of accuracy of measuring(estimating) a relevant growth curve to a particular technology, feasibility of applying estimated results, accessing and analyzing panel experts opinions. Hence, it is recommended that further study would follow soon enough to verify practical applicability and possible expansion of the study results.

• Journal of the East Asian Society of Dietary Life
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• v.17 no.6
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• pp.860-875
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• 2007

The purpose of this study was to investigate the seasonal variation in the mineral contents of fruits and vegetables available all the year -round. We analyzed Na, K, Mg, Ca, P, Fe Cr, Mn, Cu, Zn, Se, and Al concentrations by ICP-mass in 4 fruits and 17 vegetables items which are frequently consumed in Koreans. For Na content, fall apples showed the highest levels among 4 seasons, but fall tangerines contained the lowest amount of Na among the four seasons. Among the vegetables, the spinach, carrots, and lettuce contained relatively high amounts of Na. The K contents of cucumbers, cabbage, and zucchini were higher in the fall than in the other seasons. For Ca and Fe contents, spring strawberries, fall pears, and fall cabbage had the highest levels. The Cr contents of the apples were higher in the fall and winter than those were in the spring and summer. The strawberries contained their highest amounts of Cr, Mn, and Cu in the spring. The above results showed there are seasonal differences in the mineral contents of fruits and vegetables. Additionally, the fruits and vegetables tended to contain more minerals in the season they were harvested. Therefore, it is recommended to consume those fruits and vegetables during their harvest season.

• Korean Journal of Environmental Agriculture
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• v.30 no.3
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• pp.316-322
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• 2011

BACKGROUND: Pesticides concentration was monitored in 50 agricultural lakes, and ecological risk for aquatic organism was assessed using risk quotient (RQ) and probabilistic methods. METHODS AND RESULTS: Pesticides concentrations detected in 50 agricultural lakes during peak season (June and September) were in the range of $0.17{\sim}0.99{\mu}g/L$. The RQ for algae and the other species was estimated to be 0.25 and below 0.01, indicating medium risk and no risk. Oxadiazon predominantly contributed to RQ value of 99% for algae, fishes, and amphibians. In terms of hazardous concentration at 5% of species ($HC_5$), ecological risk quotients (ERQ) for oxadiazon ranged from 0.18~0.33, showing a medium risk level. Overall, the concentrations of pesticides were much lower than $HC_5$), value. Probability of combined ecological risk for pesticides ranged from 1.82% to 2.41%. CONCLUSION(s): Combined ecological risk probability did not exceed the acceptable level of 5%, indicating no ecological risk for selected aquatic species. This study suggests that regular ecological risk assessment (ERA) will be required to protect and manage an agricultural lake. Not only ERA at screening level by comparing exposure with toxic effects for aquatic species also advanced ERA technique considering species in indigenous to Korea, chronic toxicity, pulse dose, fate, and environmental factors should be required.

• Korean Journal of Soil Science and Fertilizer
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• v.21 no.1
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• pp.61-71
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• 1988

This study was conducted to find out the effect of herbicides on soil micro-organism and soil enzyme in loam soil, and on pathogenic microorganism in continuous pepper cropping soil. The result was summarized as follows: When herbicides were treated, the number of soil microorganism generally decreased at the early stage of incubation, and gradually increased at 30 days incubation. The number of fungi was significantly decreased seven times comparison with control plot. The number of actinomycetes was increased at 20 days incubation and that of pytium was increased for all days incubation in Linuron treatment plot. Although the activity of soil enzyme tended to decrease when herbicides were treated, the activities of urease and phosphatase were higher than that of control plot at the early stage of incubation in MO, Linuron and Simetryne treatment plot. In Simetryne treatment plot, the activity of protease was increased at the early stage, and suddenly decreased after 30 days incubation. There was no significant effect of herbicides on the activities of ${\beta}$-glucosidase and polygalacturonase. The activity of cellulase was inhibited at the early stage of incubation, but that of cellulase was higher than that of control plot after 20 days incubation. High significance was showed the correlation coefficient between soil microorganisms except fungi and soil respiration as herbicides were treated, and the total microorganism and soil respiration in Linuron plot. when Dicamba and Simetryne were treated, the correlation coefficient between the total microorganism and the activities of protease and urease were considerably significant.

• Korean Journal of Food Science and Technology
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• v.53 no.2
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• pp.195-203
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• 2021

Aureobasidium pullulans, a black yeast, produces pullulan, a linear α-glucan composed of maltotriose repeating units linked by α(1→6)-glycosidic linkages. Pullulan can be widely used in food, cosmetic, and biotechnology industries. In this study, we isolated eight strains of A. pullulans from Forsythia koreana, Magnolia kobus DC., Spiraea prunifolia var. simpliciflora, Cornus officinalis, Cerasus, and Hippophae rhamnoides. Among them, A. pullulans MR was selected as the best pullulan producer. The effects of a carbon source, a nitrogen source, and pH on pullulan production were examined. The optimal cultivation conditions for pullulan production by A. pullulans MR were determined by response surface methodology as 15% sucrose, 0.4% soy peptone, and an initial pH of 7 at 26℃. Under these conditions, the predicted pullulan production was 47.6 g/L, which was very close to the experimental data (48.9 g/L).

• Journal of Korean Theatre Studies Association
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• no.40
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• pp.163-206
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• 2010

Um die Jahrhundertwende des 20. Jahrhunderts besinnt sich Theater als ein Kunstwerk auf seine eigene $Realit{\ddot{a}}t$, $K{\ddot{o}}rper$, Raum und Zeit. Die Existenzweise des Theaterkunstwerks ist $Auff{\ddot{u}}hrung$. Die Kennzeichen der $Auff{\ddot{u}}hrung$ ist Transitorik, Unmittelbarkeit und Ereignishaftigkeit. $Auff{\ddot{u}}hrungsanalyse$ der Theaterwissenschaft als Disziplin wird lange Zeit $vernachl{\ddot{a}}ssigt$, weil $Auff{\ddot{u}}hrung$ ein Opfer der Zeit ist. Angesichts der $Auf{\ddot{u}}hrungsanalyse$ $mu{\ss}$ man eine Invariante zur $Verf{\ddot{u}}gung$ stellen, um einen Gegenstand zu analysieren. Die Inszenierung als ${\ddot{a}}sthetischer$ Gegenstand ist einmalig und unwiederbringlich. Das $B{\ddot{u}}hnengeschehen$ ist materielle $Realit{\ddot{a}}t$, die von dem Zuschauer sinnlich - optisch und akustisch - erfahren wird. Die Inszenierung realisiert sich in 'drei $B{\ddot{u}}hnengestalten$': 'Intendierte $B{\ddot{u}}hnengestalt$', 'realen $B{\ddot{u}}hnengestalt$' und 'vermeinte $B{\ddot{u}}hnengestalt$'. Die $Auff{\ddot{u}}hrung$ konkretisiert sich im Kopf des Zuschauers nicht als eine reale $B{\ddot{u}}hnengestalt$, sondern als ein '${\ddot{a}}sthetisches$ Objekt', 'als Abdruck der $B{\ddot{u}}hnenvorg{\ddot{a}}nge$'. Der Platz des $Auff{\ddot{u}}hrungsanalytikers$ ist der des Zuschauers, des Rezipienten. Die ${\ddot{a}}sthetische$ $B{\ddot{u}}hnengestalt$ ist eine Rekonstruktion der selektiven wahrgenommenden $Auff{\ddot{u}}hrung$, die der 'realen $B{\ddot{u}}hnengestalt$' ${\ddot{a}}hnelt$. Diese Rekonstruktion als neue $Sch{\ddot{o}}pfung$ des Rezipienten ist "Simulacrum", das der dem Objekt $hinzugef{\ddot{u}}gte$ Intellekt ist. Der Begriff der $Auff{\ddot{u}}hrungsanalyse$ wird Synonym $f{\ddot{u}}r$ die Interpretation als hermeneutischer $Proze{\ss}$. $F{\ddot{u}}r$ die Methode der $Auff{\ddot{u}}hrungsanalyse$ gibt es Strukturanalyse und Transformationsanalyse. Strukturanalyse geht $ausschlie{\ss}lich$ von der $Auff{\ddot{u}}hrung$ aus. Transformationsanalyse geht von der Transformation des Textes aus. $F{\ddot{u}}r$ diese Arbeit steht dramaturgische Analyse von Shakespeares Romeo und Julia als erste Grundlage. Die Handlungsentwicklung von Romeo und Julia ist klar in '$f{\ddot{u}}nf$ Akte' eingeteilt, die insgesamt aus 24 Szenen bestehen. Die Gesamthandlung von Romeo und Julia baut sich $pyramidenf{\ddot{o}}rmig$ nach dem Schema der steigenden und fallenden Handlung auf: Exposition/ Ausgangssituation (bis zur ersten Begegnung des Liebespaares auf dem Fest), erregendes Moment als Steigerung (von der Verliebtheit bis zur $Eheschlie{\ss}ung$), Wendepunkt/ Peripetie (Mercutios Tod), retardierendes Moment (Julias Scheintod) und Katastrophe (Vereinigung im Grabe). Die Handlung des $St{\ddot{u}}ckes$ gliedert sich in eine Haupt- und eine Nebenhandlung: dominierend ist die Liebeshandlung zwischen Romeo und Julia, daneben steht die Entwicklung der Fehde zwischen den Familien von Montague und Capulet; sie sind 'sich gegenseitig bedingend, steigernd, hemmend und vernichtend'. Parallelisierung und Kontrast der Figurenkonstellation werden in den jeweils sozial oder im Alter entsprechenden Figuren aus den beiden verfeindeten Familien gezeigt. Die Thematik des $St{\ddot{u}}ckes$ kommt in dem Oxymoron "loving hate" (I.1.175) zum Ausdruck. Shakespeare $l{\ddot{a}}sst$ die Liebeshandlung von Romeo und Julia in der Art der de casibus-$Trag{\ddot{o}}die$ spielen; deren Handlungsmuster ist 'dargestellt im Rad der Fortuna, das einen Menschen $emportr{\ddot{a}}gt$ und wieder $abst{\ddot{u}}rzen$ $l{\ddot{a}}sst$'. Das $St{\ddot{u}}ck$ Romeo und Julia ist eine experimentelle $Trag{\ddot{o}}die$. Es beginnt als $Kom{\ddot{o}}die$ mit $Z{\ddot{u}}gen$ einer Romanze, die sich aus dem Motiv der privaten Liebe und Heirat entwickelt. Pater Lorenzo und die Amme treten mit Lorenzos Wissen von der magischen Kraft der $Kr{\ddot{a}}uter$ und der $Geschw{\ddot{a}}tzigkeit$ der Amme $h{\ddot{a}}ufig$ in der $Kom{\ddot{o}}die$ auf. Die Handlung von Romeo und Julia erreicht mit Mercutios Tod den Wendepunkt, der die komische Welt zur tragischen umwandelt. $F{\ddot{u}}r$ die Sprache gibt es Prosa der Diener wie die Alltagssprache der einfachen Leute und zugleich Verse der Adeligen. Shakespeare verwendet eine kontrastreiche Metaphorik $f{\ddot{u}}r$ Raum und Zeit. Dreimal geschehen am Tag die $K{\ddot{a}}mpfe$ der verfeindeten Familien auf den ${\ddot{o}}ffentlichen$ $Pl{\ddot{a}}tzen$. Der Tag wirft ein Licht auf den Hass und die Gewalt. Die Nacht aber ist die $Sph{\ddot{a}}re$ der Liebe, wo Romeo und Julia ihre heimliche Verbindung verborgen halten $k{\ddot{o}}nnen$. Die Liebenden treffen sich in der Nacht und in dem ummauerten Raum. Oh, Tae-Suks "Romeo und Julia" wird in der Form des Madangguks gestaltet. Die Handlung in Oh, Tae- Suks Textfassung ist also nicht nach dem Prinzip der $Kausalit{\ddot{a}}t$ und Folgerichtigkeit zu lesen wie im Shakespeare-Drama. Wegen dem Ignorieren der $Kausalit{\ddot{a}}t$ des Handlungsablaufes und dem Fehlen der Motivation der Handlung ergibt sich hier keine individuelle psychologische Figurencharakterisierung. Die Figuren sind typisiert. Die koreanische Textfassung mit den extremen textlichen $Verk{\ddot{u}}rzungen$ und den zwei szenischen $Hinzuf{\ddot{u}}gungen$ $pr{\ddot{a}}gt$ die Inszenierung dahingehend, dass an die Stelle der Wortsprache mehr $K{\ddot{o}}rpersprache$ und szenische Bilder treten. Die langen Sprechpartien der Figuren im Shakespeare-Drama werden meistens $gek{\ddot{u}}rzt$ und $beschr{\ddot{a}}nken$ sich entweder auf Informationen ${\ddot{u}}ber$ die Situation oder zur Handlungsentwicklung. Und der Handlungsablauf erfolgt in Episoden sowie Musik, Lied und Tanz; Musik, Lied und Tanz dienen einerseits dem ${\ddot{U}}bergang$ der Szenen, sind aber andererseits auch selbst Teil des Handlungsablaufs. $W{\ddot{a}}hrend$ Shakespeare die Sprache der $W{\ddot{o}}rter$ in den Vordergrund $r{\ddot{u}}ckt$, $st{\ddot{u}}tzt$ Oh, Tae-Suk sich mehr auf die Sprache des $K{\ddot{o}}rpers$, die ja zugleich bildhaft ist. $Daf{\ddot{u}}r$ nimmt die Inszenierung Tanz und Lieder. Oh, Tae-Suks Inszenierung entwirft Shakespeares $Trag{\ddot{o}}die$ in der Form des Madangguks als Spiel und zugleich als erkennentnisorientiertes, nachdenkliches Theater $f{\ddot{u}}r$ den koreanischen Zuschauer, das dem traditionellen koreanischen Theater als Unterhaltungstheater nicht $m{\ddot{o}}glich$ ist, in dem sich das Volk von der Wirklichkeit erleichterte und sich $vergn{\ddot{u}}gte$. Oh, Tae-Suk formt das Publikum zum 'Wir' und zugleich zum 'Ich'. Mit dem Zusammensein der $v{\ddot{o}}llig$ andernen Theaterkulturen schafft der Reigisseur das hybride Theater und dadurch bildet $f{\ddot{u}}r$ die moderne koreanische Gesellschaft eine neue kulturelle $Identit{\ddot{a}}t$ heraus.

• Applied Biological Chemistry
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• v.21 no.3
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• pp.150-184
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• 1978

Nutritional characteristics and physio-chemical properties of mycelial growth and fruitbody formation of oyster mushroom(Pleurotus ostreatus)in synthetic media, the curtural condition for the commerical production in the rice straw and poplar sawdust media, and the changes of the chemical components of the media and mushroom during the cultivation were investigated. The results can be summarized as follows: 1. Among the carbon sources mannitol and sucrose gave rapid mycelial growth and rapid formation of fruit-body with higher yield, while lactose and rhamnose gave no mycelial growth. Also, citric acid, succinic acid, ethyl alcohol and glycerol gave poor fruit-body formation, and acetic acid, formic acid, fumaric acid, n-butyl alcohol, n-propyl alcohol and iso-butyl alcohol inhibited mycelial growth. 2. Among the nitrogen sources peptone gave rapid mycelial growth and rapid formation of fruit-body with higher yield, while D,L-alanine, asparatic acid, glycine and serine gave very poor fruit-body formation, and nitrite nitrogens, L-tryptophan and L-tyrosine inhibited mycelial growth. Inorganic nitrogens and amino acids added to peptone were effective for fruit-body growth, and thus addition of ammonium sulfate, ammonium tartarate, D,L-alanine and L-leucine resulted in about 10% increase fruit-body yield. L-asparic acid about 15%, L-arginine about 20%, L-glutamic acid, and L-lysine about 25%. 3. At C/N ratio of 15.23 fruit-body formation was fast, but the yield decreased, and at C/N ratio of 11.42 fruit-body formation was slow, but the yield increased. Also, at the same C/N ratio the higher the concentration of mannitol and petone, the higher yield was produced. Thus, from the view point of both yield of fruit-body and time required for fruiting the optimum C/N ratio would be 30. 46. 4. Thiamine, potassium dihydrogen phosphate and magnecium sulfate at the concentration of $50{\mu}g%$. 0.2% and 0.02-0.03%, respectively, gave excellent mycelial and fruit-body growth. Among the micronutrients ferrous sulfate, zinc sulfate and manganese sulfate showed synergetic growth promoting effect but lack of manganese resulted in a little reduction in mycelial and fruit-body growth. The optimum concentrati on of each these nutrients was 0.02mg%. 5. Cytosine and indole acetic acid at 0.2-1mg% and 0.01mg%, respectively, increased amount of mycelia, but had no effect on yield of fruit-body. The other purine and pyrimidine bases and plant hormones also had no effect on mycelial and fruit-belly yield. 6. Illumination inhibited mycelial growth, but illumination during the latter part of vegetative growth induced primordia formation. The optimum light intensity and exposure time was 100 to 500 lux and 6-12 hours per day, respectively. Higher intensity of light was injurous, and in darkness only vegetative growth without primordia formation was continued. 7. The optimum temperature for mycelial growth was $25^{\circ}C$ and for fruit-body formation 10 to $15^{\circi}C$. The optimum pH range was from 5.0 to 6.5. The most excellent fry it-body formation were produced from the mycelium grown for 7 to 10 days. The lesser the volume of media, the more rapid the formation of fruit-body; and the lower the yield of fruit-body; and the more the volume of media, the slower the formation of fruit-body, and the higher the yield of fruit-body. The primordia formation was inhibited by $CO_2$. 8. The optimum moisture content for mycelial growth was over 70% in the bottle media of rice straw and poplar sawdust. 10% addition of rice bran to the media exhibited excellent mycelial growth and fruit-body formation, and the addition of calciumcarbonate alone was effective, but the addition of calcium carbonate was ineffective in the presence of rice bran. 9. In the cultivation experiments the total yield of mushroom from the rice straw media was $14.99kg/m^2$, and from the sawdust media $6.52kg/m^2$, 90% of which was produced from the first and second cropping period. The total yield from the rice straw media was about 2.3 times as high as that from the sawdust media. 10. Among the chemical components of the media little change was observed in the content of ash on the dry weight basis, and organic matter content decreased as the cultivation progressed. Moisture content, which was about 79% at the time of spawning, decreased a little during the period of mycelial propagation, after which no change was observed. 11. During the period from spawning to the fourth cropping about 16.7% of the dry matter, about 19.3% of organic matter, and about 40% of nitrogen were lost from the rice straw media; about 7.5% of dry mallet, about 7.6% of organic matter, and about 20% of nitrogen were lost from the sawdust media. For the production of 1kg of mushroom about 232g of organic matter and about 7.0g of nitrogen were consumed from the rice straw media; about 235g of organic matter and about 6.8g of nitrogen were consumed from the sawdust media, 1㎏ of mushroom from either of media contains 82.4 and 82.3g of organic matter and 5.6 and 5.4g of nitrogen, respectively. 12. Total nitrogen content of the two media decreased gradually as the cultivation progressed, and total loss of insoluble nitrogen was greater than that of soluble nitrogen. Content of amino nitrogen continued to increase up to the third cropping time, after which it decreased. 13. In the rice straw media 28.0 and 13.8% of the total pentosan and ${\alpha}$-cellulose, respectively, lost during the whole cultivation period was lost during the period of mycelial growth; in the sawdust media 24.1 and 11.9% of the total pentosan and ${\alpha}$-cellulose, respectively, was lost during the period of mycelial growth. Lignin content in the media began to decrease slightly from the second cropping time, while the content of reduced sugar, trehalose and mannitol continued to increase. C/N ratio of the rice straw media decreased from 33.2 at spawining to 30.0 at ending; that of the sawdust media decreased from 61.3 to 60.0. 14. In both media phosphorus, potassium, manganese and zinc decreased, at magnesium, calcium and copper showed irregular changes, and iron had a tendency to be increased. 15. Enzyme activities are much higher in the rice straw media than in the sawdust media. CMC saccharifying and liquefying activity gradually increased from after mycelial propagation to the second cropping, after which it decreased in both media. Xylanase activity rapidly and greatly increased during the second cropping period rather than the first period. At the start of the third cropping period the activity decreased rapidly in the rice straw media, which was not observed in the sawdust media. Protease activity was highest after mycelial propagation, after which it gradually decreased. The pH of the rice straw media decreased from 6.3 at spawning to 5.0 after fourth cropping; that of the sawdust media decreased from 5.7 to 4.9. 16. The contents of all the components except crude fibre of the mushroom from the rice straw media were higher than those from the sawdust media. Little change was observed in the content of the components of mushroom cropped from the first to the third period, but slight decrease was noticed at the fourth cropping.