• 제목/요약/키워드: delta I

검색결과 1,149건 처리시간 0.032초

Screening for candidate genes related with histological microstructure, meat quality and carcass characteristic in pig based on RNA-seq data

  • Ropka-Molik, Katarzyna;Bereta, Anna;Zukowski, Kacper;Tyra, Miroslaw;Piorkowska, Katarzyna;Zak, Grzegorz;Oczkowicz, Maria
    • Asian-Australasian Journal of Animal Sciences
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    • 제31권10호
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    • pp.1565-1574
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    • 2018
  • Objective: The aim of the present study was to identify genetic variants based on RNA-seq data, obtained via transcriptome sequencing of muscle tissue of pigs differing in muscle histological structure, and to verify the variants' effect on histological microstructure and production traits in a larger pig population. Methods: RNA-seq data was used to identify the panel of single nucleotide polymorphisms (SNPs) significantly related with percentage and diameter of each fiber type (I, IIA, IIB). Detected polymorphisms were mapped to quantitative trait loci (QTLs) regions. Next, the association study was performed on 944 animals representing five breeds (Landrace, Large White, Pietrain, Duroc, and native Puławska breed) in order to evaluate the relationship of selected SNPs and histological characteristics, meat quality and carcasses traits. Results: Mapping of detected genetic variants to QTL regions showed that chromosome 14 was the most overrepresented with the identification of four QTLs related to percentage of fiber types I and IIA. The association study performed on a 293 longissimus muscle samples confirmed a significant positive effect of transforming acidic coiled-coil-containing protein 2 (TACC2) polymorphisms on fiber diameter, while SNP within forkhead box O1 (FOXO1) locus was associated with decrease of diameter of fiber types IIA and IIB. Moreover, subsequent general linear model analysis showed significant relationship of FOXO1, delta 4-desaturase, sphingolipid 1 (DEGS1), and troponin T2 (TNNT2) genes with loin 'eye' area, FOXO1 with loin weight, as well as FOXO1 and TACC2 with lean meat percentage. Furthermore, the intramuscular fat content was positively associated (p<0.01) with occurrence of polymorphisms within DEGS1, TNNT2 genes and negatively with occurrence of TACC2 polymorphism. Conclusion: This study's results indicate that the SNP calling analysis based on RNA-seq data can be used to search candidate genes and establish the genetic basis of phenotypic traits. The presented results can be used for future studies evaluating the use of selected SNPs as genetic markers related to muscle histological profile and production traits in pig breeding.

유용 활엽수림 조성을 위한 특수림 개발에 관한 기초연구 - 천연림 보육을 위한 시업적용 I - (Studies on the Forestation of Useful Broad Leaf Tree and the Development of Some Special Trees - Practice Application for Tending of Natural Forest I -)

  • 김영채
    • 한국산림과학회지
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    • 제82권4호
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    • pp.406-419
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    • 1993
  • 천연 활엽수림은 그 경제적, 조림학적 중요성에도 불구하고 아직 우리나라에서는 그에 대한 시업체계가 확립되어 있지 않아, 본 연구에서는 임목의 보육체계 확립을 위한 연구의 일환으로 가지치기 기술 개선에 있어 보다 명확한 기초자료를 얻기 위해, 굴참나무 천연림의 수관구조 및 물질생산구조를 해석하고 그 자료를 기초로 이에 대한 가지치기 방법을 검토하였던바 그 결과를 요약하면 다음과 같다. 먼저 가지의 착지부위 즉, 지하고는 수고 및 직경과의 관계에서 직접적인 영향을 나타내지 않았고, 지하고의 높이는 거의 비슷한 높이에서 분포하고 있었다. 그리고 엽량의 최대층과 가지량의 최대층은 거의 같은 층에 분포하고 있었으며 가지 성장량의 최대층은 이보다 상부에 나타나고 있음을 알 수 있었다. 또한 옹이 없는 간재 생산에 대한 가지의 공헌도는 하층부에서 상층부로 갈수록 높게 나타났다. 그리고 실제 가지치기에 대한 응용 지표를 찾기 위한 방법으로 먼저 가지의 착엽 부위와 미 착엽 부위와의 비율을 수관의 형태적 지표로 삼아 적용하는 방법 모색과, 수관의 길이를 기준으로 일정한 지하고에서 가지치기를 행하는 방법에 관해 검토하고 이에따른 수관의 각 기관에 대한 제거율 등을 구하였다.

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The Far-ultraviolet Spectrum Study of Comet C/2001 Q4 (NEAT)

  • Lim, Yeo-Myeong;Min, Kyoung-Wook;Feldman, Paul D.;Han, Wanyong;Edelstein, Jerry
    • 천문학회보
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    • 제39권1호
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    • pp.68.1-68.1
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    • 2014
  • We present the results of far-ultraviolet (FUV) observations of comet C/2001 Q4 (NEAT) obtained with Far-ultraviolet Imaging Spectrograph (FIMS) on board the Korean microsatellite STSAT-1, which operated at an altitude of 700 km in a sun-synchronous orbit. FIMS is a dual channel imaging spectrograph (S-channel 900-1150 ${\AA}$, L-channel 1350-1710 ${\AA}$, and ${\lambda}/{\Delta}{\lambda}$ ~ 550 for both channels) with large image fields of view (S-channel $4.0^{\circ}{\times}4.6^{\prime}$, L-channel $7.5^{\circ}{\times}4.3^{\prime}$, and angular resolution ~ $5-10^{\prime}$) optimized for the observation of diffuse emission of astrophysical radiation. Comet C/2001 Q4 (NEAT) were made in two campaigns during its perihelion approach between May 8 and 15, 2004. Based on the scanning mode observations in the wavelength band of 1400-1700 ${\AA}$, we have constructed an image of the comet with an angular size of $5^{\circ}{\times}5^{\circ}$, which corresponds to the central coma region. Several important fluorescence emission lines were detected including S I multiplets at 1429 and 1479 ${\AA}$, C I multiplets at 1561 and 1657 ${\AA}$, and the CO $A^1{\Pi}-X^1{\Sigma}^+$ Fourth Positive system; we have estimated the production rates of the corresponding species from the fluxes of these emission lines. The estimated production rate of CO was $Q_{CO}=(2.65{\pm}0.63){\times}10^{28}s^{-1}$, which is 6.2-7.4% of the water production rate and is consistent with earlier predictions. The average carbon production rate was estimated to be $Q_C={\sim}1.59{\times}10^{28}s^{-1}$, which is ~60% of the CO production rate. However, the observed carbon profile was steeper than that predicted using the two-component Haser model in the inner coma region, while it was consistent with the model in the outer region. The average sulfur production rate was $Q_S=(4.03{\pm}1.03){\times}10^{27}s^{-1}$, which corresponds to ~1% of the water production rate.

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무등산 인공 침엽수림에서 테르펜과 기상인자의 상관성분석 (Correlation Analysis Between Terpene and Meteorological Factors at Artificial Coniferous Forest of Mt. Moodeung)

  • 이대행;김민희;서희정;민경우;김승호;서광엽;정원삼;강영주;안기완;백계진;문용운;김은선
    • 한국환경과학회지
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    • 제21권10호
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    • pp.1221-1234
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    • 2012
  • There are many factors to influence the amount of terpene at the forest. However, it is poorly understood whether the amount is altered by meteorological factors. In order to study correlation analysis between terpene amount and meteorological(i.e., temperature, humidity, wind speed, solar radiation) and environmental factors(i.e., oxygen, carbonb dioxide) at the artificial coniferous forest of Chamaecyparis obtusa (site 1) and Cryptomeria japonica (site 2) nearby the $1^{st}$ reservoir at Mt. Moodeung, the research was executed during April to November in 2011. Forest density at site 1 was 1,692 trees/ha, being occupied with 87.2% of Chamaecyparis obtusa, higher than 925 trees/ha at site 2. Carbon dioxide at site 1 was in the range of 385~410 ppm in June, similar to at Anmyundo(395 ppm in 2010). Solar radiation has positive correlation with ambient temperature and inversely negative with relative humidity. Main species of terpene released were ${\alpha}$-pinene, camphene, ${\beta}$-pinene, cymene, ${\delta}$-limonene and camphor at two sites and terpene was more effluent at spring and summer than at fall. The large amount of terpene was emitted in the afternoon than in the morning under the influence of the wind speed and the topographical property. The terpene amount has positive correlation with relative humidity and oxygen, and negative with wind speed and soil temperature. Because correlations of ${\alpha}$-pinene and other terpene materials showed statistically significant within p=0.01. ${\alpha}$-pinene could be suggested as the basic material in explaining the amount of other terpene materials.

전분발효 효모에서의 외래 $\alpha$-Amylase 유전자의 세포분열시 안정성 증진 (Mitotic Stability of Heterologous $\alpha$-Amylase Gene in Starch-Fermenting Yeast)

  • 김정희;김근;최영길
    • 미생물학회지
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    • 제32권4호
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    • pp.271-279
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    • 1994
  • ${\alpha}$-Amylase와 glucoamylase를 동시에 안정하게 분비하여 전분을 일단계로 직접 에탄올로 발효시킬수 있는 효모 균주를 개발하기 위하여 glucoamylase를 분비하는 Saccharomyces diastaticus hybrid 균주에 쥐의 침샘 유래의 ${\alpha}$-amylase cDNA 유전자를 plasmid vector를 이용하여 도입하였다. 이 균주로부터 효소생산에 필요한 유전자를 잃어버림이 없이 안정하게 분비할 수 있도록 하기 위하여 $\alpha$-amylase 유전자를 효모의 염색체에 삽입시키기 위한 integrating plasmid vector인 YIpMS$\Delta$R(LEU2)를 제작하였다. 이 vector의 효모형질전환에 있어 원형(circular)상태와 제한 효소 XbaI으로 처리된 직선화된(linearized) 상태의 두가지 형태를 비교한 결과 형질전환 효율에서나 형질전환체내의 $\alpha$-amylase 유전자 보유정도가 모두 직선화된 형태의 경우가 원형상태의 경우보다 높았다. Linearized vecotr를 가진 효모 형질전환체에서의 유전자 발현 안정도는 세포분열을 거듭할수록 episomal vecotr에 의한 효모 형질전환체에서의 발현 안정도보다 우수하게 나타났다. 또한 이 linearized vector를 가진 형질전환체는 $\alpha$-amylase와 glucoamylase를 동시에 분비하여 glucoamylase만 분비하는 원균주보다 2배 이상의 전분분해력을 보였다.

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정미기의 능률에 미치는 기계적 요인및 작동조건에 관한 연구 (Mechanical and Operational Factors Affecting the Efficiency of Rice Polishing Machines)

  • 노상하
    • Journal of Biosystems Engineering
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    • 제1권1호
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    • pp.15-15
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    • 1976
  • In analyzing the operational characteristics of a rice whitening machine, the internal radial pressure of the machine was measured using strain gage equipment. Changes in cylinder and feed screw configurations, screen type, cylinder speed and counter-pressure levels were examined to determine their impact on the quality and quantity of milled rice and the performance of the machine. The results are summarized as follows: 1. The internal radial pressure in the whitening chamber varied with the surface condition of the grain being processed. During the first or second pass through the machine, pressure was relatively low, reached a maximum after two to three passes with combinations I and II, three to six with combination III and then began to fall. 2. The pitch of the feed screw and the size of the feed gate opening which determine the rate of entry of grain into the whitening chamber, appeared to be the most important factor aff-::cting the degree of radial pressure, quality and quantity of milled rice and the efficiency of the machine. Using a feed screw with a wide pitch (4.8cm), radial pressure was relatively high and head rice recovery ratio \vere quite low. In this case capacity and machine effic?iency were much higher than obtained when using a feed screw with a narrow pitch (2.3cm). Very significant responses in radial pressure, head rice recovery rates and machine capacity were observed with changes in cylinder speed and counter-pressure levels when using the wide pitch feed screw. 3. The characteristics of the screen which surrounds the whitening chamber had an important effect on whitening efficiency. The existence of small protuberances on the original screen resulted in significant increases in both machine capacity and efficiency but without a significant decrease in head rice recovery or development of excessive radial pressure. Further work is required to determine the effects of screen surface conditions and the shape of the cylinderical steel roller on the rate of bran removal, machine efficiency and recovery rates. The size of the slotted perforations 0:1 the screen affects total milled rice recovery. The opening size on the original screen was fabricated to accommodate the round shape of Japonica rice varieties but was not suitable for the more slender Indica type. Milling Indica varieties with this screen resulted in a reduction in total milled rice recovery. 4. An increase in cylinder speed from 380 to 820 rpm produced a positive effect on head rice recovery for all machine combinations at every level of counter-pressure used in the tests. Head rice recovery was considerably lower at 380rpm using a wide screw pitch when compared to the results obtained at speeds from 600 to 820 r.p.m. The effects of cylinder speed On radial pressure, capacity and machine efficiency showed contrasting results, depending on the width of the feed screw pitch. With a narrow feed screw pitch (2.3cm), a direct proportional relationship was observed bet?ween cylinder speed and both radial pressure and machine efficiency. In contrast, using a 4.8 centimeter pitch feed roller produced a series of inverse relationships between the above variables. Based on the results of this study it is recommended when milling Indica type long grain rice varieties that the cylinder speed of the original machine be increased from 500-600 rmp up to a minimum of 800 rpm to obtain a greater abrasive effect between the grain and the screen. The pitch of the feed screw should be also reduced to decr?ease the level of internal radial pressure and to obtain higher machine efficiency and increased quality of milled rice with increased cylinder speeds. Further study on the interaction between cylinder speed and feed screw pitch is recommended. 5. An increase in the counter pressure level produced a negative effect On the head rice recovery with an increase in radial pressure, capacity, and machine efficiency over all combinations and at every level of cylinder speed. 6. Head rice recovery rates were conditioned primarily by the pressure inside the whitening chamber. According to the empirical cha racteristics curve developed in this study, the relationships of head rice recovery ($Y_h$) and machine capacity ($Y_c$/TEX>) to internal radial pressure ($X_p$) followed an inverse quadratic function and a linear function respectively: $$Y_h^\Delta=\frac{1}{{1.4383-0.2951X_p^\ast+0.1425X_p^{\ast\ast}}^2} , (R^2=0.98)$$$$Y_c^\Delta=-305.83+374.37X_p^{\ast\ast}, (R^2=0.88)$$The correlation between capacity and power consumption per unit of brown rice expressed in the following exponential function: $$Y_c^\Delta=1.63Y_c^{-0.7786^\{\ast\ast}, (R^2=0.94)$$These relationships indicate that when radial pressure increases above a certain range (1. 6 to 2.0 kg/$cm^2$ based On the results of the experiment) head ricerecovery decrea?ses in a quadratic relation with a inear increase in capacity but without any decrease in power consump tion per unit of brown rice. On the other hand, if radial pressure is below the range shown above, power consumption increases dramatically with a lin?ear decrease in capacity but without significant increases in head rice recovery. During the operation of a given whitening machine, the optimum radial pressure range or the correct capacity range should be selected by controlling the feed rate and/or counter-pressure keeping in mind the condition of the grain, particulary the hardness. It was observed that the total number of passes is related to radial pessure level, feed rate and counter-pressure level. The higher theradial pressure the fewer num?ber of pass required but with decreased head rice recovery. In particular, when using high feed rates, the total number of passes should be increased to more than three by reducing the counter-pressure level to avoid decreaseases in head rice recovery (less than 65 percent head rice recovery on the basis of brown rice) at every cylinder speed. 7. A rapid rise in grain temperature seemed to have a close relationship with the pressure generated inside the whitening chamber and, subsequently with head rice reco?very rates. The higher the rate of increase, the lower were the resulting head rice recoveries.

정미기의 능률에 미치는 기계적 요인및 작동조건에 관한 연구 (Mechanical and Operational Factors Affecting the Efficiency of Rice Polishing Machines)

  • 노상하;최재갑
    • Journal of Biosystems Engineering
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    • 제1권1호
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    • pp.17-48
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    • 1976
  • In analyzing the operational characteristics of a rice whitening machine, the internal radial pressure of the machine was measured using strain gage equipment. Changes in cylinder and feed screw configurations, screen type, cylinder speed and counter-pressure levels were examined to determine their impact on the quality and quantity of milled rice and the performance of the machine. The results are summarized as follows: 1. The internal radial pressure in the whitening chamber varied with the surface condition of the grain being processed. During the first or second pass through the machine, pressure was relatively low, reached a maximum after two to three passes with combinations I and II, three to six with combination III and then began to fall. 2. The pitch of the feed screw and the size of the feed gate opening which determine the rate of entry of grain into the whitening chamber, appeared to be the most important factor aff-::cting the degree of radial pressure, quality and quantity of milled rice and the efficiency of the machine. Using a feed screw with a wide pitch (4.8cm), radial pressure was relatively high and head rice recovery ratio \vere quite low. In this case capacity and machine effic\ulcorneriency were much higher than obtained when using a feed screw with a narrow pitch (2.3cm). Very significant responses in radial pressure, head rice recovery rates and machine capacity were observed with changes in cylinder speed and counter-pressure levels when using the wide pitch feed screw. 3. The characteristics of the screen which surrounds the whitening chamber had an important effect on whitening efficiency. The existence of small protuberances on the original screen resulted in significant increases in both machine capacity and efficiency but without a significant decrease in head rice recovery or development of excessive radial pressure. Further work is required to determine the effects of screen surface conditions and the shape of the cylinderical steel roller on the rate of bran removal, machine efficiency and recovery rates. The size of the slotted perforations 0:1 the screen affects total milled rice recovery. The opening size on the original screen was fabricated to accommodate the round shape of Japonica rice varieties but was not suitable for the more slender Indica type. Milling Indica varieties with this screen resulted in a reduction in total milled rice recovery. 4. An increase in cylinder speed from 380 to 820 rpm produced a positive effect on head rice recovery for all machine combinations at every level of counter-pressure used in the tests. Head rice recovery was considerably lower at 380rpm using a wide screw pitch when compared to the results obtained at speeds from 600 to 820 r.p.m. The effects of cylinder speed On radial pressure, capacity and machine efficiency showed contrasting results, depending on the width of the feed screw pitch. With a narrow feed screw pitch (2.3cm), a direct proportional relationship was observed bet\ulcornerween cylinder speed and both radial pressure and machine efficiency. In contrast, using a 4.8 centimeter pitch feed roller produced a series of inverse relationships between the above variables. Based on the results of this study it is recommended when milling Indica type long grain rice varieties that the cylinder speed of the original machine be increased from 500-600 rmp up to a minimum of 800 rpm to obtain a greater abrasive effect between the grain and the screen. The pitch of the feed screw should be also reduced to decr\ulcornerease the level of internal radial pressure and to obtain higher machine efficiency and increased quality of milled rice with increased cylinder speeds. Further study on the interaction between cylinder speed and feed screw pitch is recommended. 5. An increase in the counter pressure level produced a negative effect On the head rice recovery with an increase in radial pressure, capacity, and machine efficiency over all combinations and at every level of cylinder speed. 6. Head rice recovery rates were conditioned primarily by the pressure inside the whitening chamber. According to the empirical cha racteristics curve developed in this study, the relationships of head rice recovery ($Y_h$) and machine capacity ($Y_c$/TEX>) to internal radial pressure ($X_p$) followed an inverse quadratic function and a linear function respectively: $$Y_h^\Delta=\frac{1}{{1.4383-0.2951X_p^\ast+0.1425X_p^{\ast\ast}}^2} , (R^2=0.98)$$ $$Y_c^\Delta=-305.83+374.37X_p^{\ast\ast}, (R^2=0.88)$$ The correlation between capacity and power consumption per unit of brown rice expressed in the following exponential function: $$Y_c^\Delta=1.63Y_c^{-0.7786^\{\ast\ast}, (R^2=0.94)$$ These relationships indicate that when radial pressure increases above a certain range (1. 6 to 2.0 kg/$cm^2$ based On the results of the experiment) head ricerecovery decrea\ulcornerses in a quadratic relation with a inear increase in capacity but without any decrease in power consump tion per unit of brown rice. On the other hand, if radial pressure is below the range shown above, power consumption increases dramatically with a lin\ulcornerear decrease in capacity but without significant increases in head rice recovery. During the operation of a given whitening machine, the optimum radial pressure range or the correct capacity range should be selected by controlling the feed rate and/or counter-pressure keeping in mind the condition of the grain, particulary the hardness. It was observed that the total number of passes is related to radial pessure level, feed rate and counter-pressure level. The higher theradial pressure the fewer num\ulcornerber of pass required but with decreased head rice recovery. In particular, when using high feed rates, the total number of passes should be increased to more than three by reducing the counter-pressure level to avoid decreaseases in head rice recovery (less than 65 percent head rice recovery on the basis of brown rice) at every cylinder speed. 7. A rapid rise in grain temperature seemed to have a close relationship with the pressure generated inside the whitening chamber and, subsequently with head rice reco\ulcornervery rates. The higher the rate of increase, the lower were the resulting head rice recoveries.

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Bacillus Subtilis CBD2로 배양된 백미 발효물의 미세캡슐 제조 및 물리화학적 특성 (Physicochemical properties and microencapsulation process of rice fermented with Bacillus subtilis CBD2)

  • 이대훈;박혜미;홍주헌
    • 한국식품저장유통학회지
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    • 제22권2호
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    • pp.225-231
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    • 2015
  • 본 연구에서는 백미 발효물을 곡류 효소함유 식품으로 개발하고자Bacillus subtilis CBD2를 접종하여 96시간 발효한 다음 알긴산 및 키토산을 피복물질로 사용하여 분무건조 미세캡슐 분말을 제조하였고, 분말의 물리화학적 특성 및 amylase 활성을 조사하였다. 백미 발효물의 생균수, pH 및 amylase 활성은 각각 7.61 log CFU/mL, pH 5.08 및 159.43 unit/mL이었다. 백미 발효물의 미세캡슐 분말 제조는 알긴산 1.0% 및 키토산을 각각 0.3%, 0.5%, 1.0%를 첨가하여 분무건조 하였다. 분무건조 미세캡슐 분말의 수분함량은 2.90~3.68%였으며, 색도는 키토산 첨가량이 증가함에 따라 L값 및 a값은 감소하고, b값 및 ${\Delta}E$값은 상대적으로 증가하였다. 입자크기는 분무건조 미세캡슐 분말에서 $48.13{\sim}68.48{\mu}m$로 동결건조 분말 $357.87{\mu}m$ 보다 작았으며, 표면 구조는 전반적으로 구형을 나타내었으나, 키토산 함량이 증가함에 따라 표면 굴곡이 증가하였다. 수분흡수지수는 분무건조 미세캡슐 분말에서 2.40~2.65로 동결건조 분말 2.66에 비해 낮은 흡수지수를 나타내었으며, 수분용해지수는 분무건조 미세캡슐 분말에서 9.17~10.89%로 동결건조 분말(7.12%)보다 높게 나타났다. 생균수 및 amylase 활성은 동결건조 분말에서 각각 7.01 log CFU/g 및 506.02 unit/g으로 나타났으며, 분무건조 미세캡슐에서는 각각 4.46~4.62 log CFU/g 및 196.63~268.57 unit/g으로 나타나 동결건조 분말 보다 낮게 나타났다. 분말의 인체 내 소화 모델에서, 모든 분말은 pH 1.2의 인공위액에서 활성을 나타내지 않았으며, 최종적으로 pH 7.4의 대장조건에서 알긴산에 0.3%의 키토산을 첨가한 분무건조 미세캡슐 분말이 85.93%의 amylase 활성을 나타내어 인체에서의 높은 이용률이 기대되었다.

비글견에서 좌측앞쪽목신경절 차단에 대한 정량적 뇌파 분석 (The Analysis of Quantitative EEG to the Left Cranial Cervical Ganglion Block in Beagle Dogs)

  • 박우대;배춘식;김세은;이수한;이정선;장화석;정다정;이재훈;김휘율
    • 한국임상수의학회지
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    • 제24권4호
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    • pp.514-521
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    • 2007
  • 교감신경차단은 지배영역에 대한 혈류를 증가시킨다. 이러한 이유로, 교감신경차단은 신경학적 질병이나 뇌질환 등에 시술되어 왔다. 그러나, 개에서 앞쪽목신경절 차단에 의한 뇌혈류의 조절은 잘 알려져 있지 않으며 뇌 순환의 변화와 뇌파의 변화에 대한 상관관계는 아직까지 개에서 잘 정의되어 있지 않다. 그래서, 우리는 뇌파의 변화는 개에서 앞쪽목신경절 차단에 의한 뇌혈류의 변화에 영향을 받을 수 있을 거라는 가설을 검증하였다. 25두의 비글견을 3개의 군으로 나누었다. I군(LCCGB, n=10)은 1% lidocaine을 이용하여 좌측 앞쪽목신경절을 차단하였다. II군(L, n=10)은 1% lidocaine을 좌 우측 두힘살근 내에 주입하였다. III군(N/SCCGB, n=5, 대조군)은 좌측 앞쪽목신경절을 생리식염수를 이용하여 차단하였다. 95% SEF와 MF에서는 대조군과 LCCGB군에서 통계적 차이가 없었다. 상대적 주파수 영역에서는 $\delta$ 주파수는 5-25분 사이에 감소하였으며, $\alpha$ 주파수는 같은 시간 동안 증가 하였다(p<0.05). 그러나, $\theta$ 주파수와 $\beta$ 주파수는 같은 시간대 대조군에 비해 유의한 변화를 보이지 않았다(p<0.05). 이러한 결과는 좌측 앞쪽목신경절 차단은 뇌혈류의 변화를 유발하지 못하며 그 자체의 효과는 불확실 하다는 것을 제시한다.

망간산화물(Birnessite)을 매개로한 산화-변환반응을 이용한 PAH-퀴논화합물의 제거 (Removals of PAH-quinones Using Birnessite-Mediated Oxidative-Transformation Processes)

  • 최찬규;한윤이;김성욱;신현상
    • 대한환경공학회지
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    • 제33권6호
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    • pp.396-404
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    • 2011
  • 본 연구에서는 PAHs 오염토양의 화학적 생물학적 처리과정에서 반응부산물로 흔히 발견되는 PAH-퀴논화합물을 대상으로 수용액 상에서의 망간산화물에 의한 산화-변환 제거 특성(제거율, 반응속도)을 조사하였다. 반응시간 경과에 따른 상등액의 HPLC 분석결과로부터 p-퀴논화합물인 Acenaphthenequinone (APQ)는 망간산화물 자체에 의한 산화-결합 반응을 통해 제거되며, o-퀴논화합물인 Anthraquinone (AQ)와 1,4-Naphthoquinone (1,4-NPQ)는 반응매개체(Catechol) 존재 하에서의 교차-결합반응을 통해 효과적으로 제거 가능함을 확인하였다. 망간산화물에 의한 PAH-퀴논화합물의 제거는 유사-일차 반응 속도식을 따랐으며, 본 실험조건(1,4-NPQ = 11.5 mg/L, CAT = 50 mg/L, $MnO_2$ = 1.0 g/L, pH 5, 반응시간 = 6~96 hr)에서의 1,4-NPQ의 교차-결합 반응속도상수(k, $hr^{-1}$)는 0.0426으로 APQ의 산화-결합 반응속도 상수(0.173)에 비교해 약 4배 정도의 차이를 보였다. 동일조건에서의 망간산화물 주입량별 속도상수를 망간산화물의 비표면적으로 표준화하여 얻은 1,4-NPQ의 교차-결합 반응에 대한 비표면적표준화속도상수($K_{surf}$)는 $8.5{\times}10^{-4}L/m^2{\cdot}hr$이었다. 망간산화물 주입량별 제거특성과 반응 속도상수의 비교 해석 결과로부터 1,4-NPQ의 교차-결합 반응은 반응시간 경과에 따라 서로 다른 반응기작을 거침을 확인하였으며, 이를 기존 문헌결과와 함께 해석하였다.