This study was devised to elucidate whether soused shrimp exhibits a digestive action on boiled pork meats. and the mechanism by which sousing with a high concentration of sodium chloride preserves nutrients in foods for a prolonged pe\ulcornerriod. Protease was isolated from soused shrimp using a combination of ammonium sulfate fractionation. DEAE - cellulose ion exchange chromatography and gel filtra\ulcornertion. The isolated protease had specific activity of 1.560 units. 210 purification fo\ulcornerld with an yield of 38%. Its optimum pH and temperature were 8.0 and $43^{\circ}C$ respectively. The molecular weight of the enzyme was 35.000. The Km value of the enzyme for casein was 1.6 x $10^{-6}$ M The e=yme required the presence of cu\ulcornerpric ion to exhibit its full activity. Eighty eight percent of the enzyme activity was in\ulcornerhibited by 3.5M NaCI showing a reversibly linear decrease of the enzyme activity as NaCI concentration increased. The nature of the inhibition by NaCl was rever\ulcornersible and noncompetitive. The protease activity in soused shrimp was well preser\ulcornerved with the elapse of time at least in part due to NaCI induced suppression of autodigestion. The enzyme was denatured by acid easily. i.e. 1% of the original activity remained after staying at pH 2 for 10 minutes. which is within the norm\ulcorneral range of pH of the human stomach. Soused shrimp was observed to be one of those containing the highest protease activity compared with the other soused foo\ulcornerds such as soused oyster. squid. clam. and Pollack intestine with respect to spec\ulcornerific activities of dialized 1:4 whole homogenates(w/v) in 5 mM sodium phospha\ulcornerte - 2.4 mM j3 - mercaptoethanol buffer. pH 8.0. Casein and boiled meats including pork, beef, and chicken appeared to be the good substrates for the protease. Casein was the best. Therefore. the ingestion of boiled meats including pork together with soused sh\ulcornerrimp would help digestion of boiled pork in human not only by increasing appe\ulcornertite also by the direct proteolytic digestion of boiled meats by soused shrimp to\ulcorner some extent. And a high concentration of sodium chloride inhibited the protease activity reversibly in a remarkable degree, which ensued in a significant retardat\ulcornerion of autodigestion of protein in foods by proteases, and hereby contributed to the preservation of foods for an extended period.
Induction of embryogenic callus from Allium wakegi Araki explants was promoted on medium containing 2,4-D, and production of abnormal embryos from the embryogenic callus increased as 2,4-D concentration was raised. Shoot tip was found to be the best explant source for embryogenic callus formation followed in the order by bulb scale and leaf section. Medium containing 0.09 M sucrose was effective for embryogenic callus production. The regenerants from embryogenic callus on medium containing 2,4-D and BA at different concentrations was consisted of diploids, tetraploids and a few mixaploids of 2n+4n, and their chromosomal aberration rate ranged from 8.0 to 33.3%. Frequency of chromosomal aberrants was the highest (18.7%) in the regenerants obtained from bulb scale-derived embryogenic callus among others. Plant regeneration rate was high (33.5%) from the shoot tip-derived embryogenic callus and the frequency of chromosomal aberrants was very low (7.0%). The plantlets regenerated on medium containing 0.26 M sucrose resulted in high chromosomal aberrants. The regenerants on medium containing sucrose at 0.09∼0.20 M produced chromosomal aberrants at around 15.2∼16.6%.
Proceedings of the Korean Vacuum Society Conference
/
1998.02a
/
pp.77-77
/
1998
Present silicon dioxide (SiOz) 떠m as intennetal dielectridIMD) layers will result in high parasitic c capacitance and crosstalk interference in 비gh density devices. Low dielectric materials such as f f1uorina뼈 silicon oxide(SiOF) and f1uoropolymer IMD layers have been tried to s이ve this problem. I In the SiOF ftlm, as fluorine concentration increases the dielectric constant of t뼈 film decreases but i it becomes unstable and wa않r absorptivity increases. The dielectric constant above 3.0 is obtain어 i in these ftlms. Fluoropolymers such as polyte$\sigma$따luoroethylene(PTFE) are known as low dielectric c constant (>2.0) materials. However, their $\alpha$)Or thermal stability and low adhesive fa$\pi$e have h hindered 야1리ru뚱 as IMD ma따"ials. 1 The concept of a plasma processing a찌Jaratus with 비gh density plasma at low pressure has r received much attention for deposition because films made in these plasma reactors have many a advantages such as go여 film quality and gap filling profile. High ion flux with low ion energy in m the high density plasma make the low contamination and go어 $\sigma$'Oss피lked ftlm. Especially the h helicon plasma reactor have attractive features for ftlm deposition 야~au똥 of i앙 high density plasma p production compared with other conventional type plasma soun:es. I In this pa야Jr, we present the results on the low dielectric constant fluorocarbonated-SiOF film d밑JOsited on p-Si(loo) 5 inch silicon substrates with 00% of 0dFTES gas mixture and 20% of Ar g gas in a helicon plasma reactor. High density 띠asma is generated in the conventional helicon p plasma soun:e with Nagoya type ill antenna, 5-15 MHz and 1 kW RF power, 700 Gauss of m magnetic field, and 1.5 mTorr of pressure. The electron density and temperature of the 0dFTES d discharge are measUI벼 by Langmuir probe. The relative density of radicals are measured by optic허 e emission spe따'Oscopy(OES). Chemical bonding structure 3I피 atomic concentration 따'C characterized u using fourier transform infrared(FTIR) s야3띠"Oscopy and X -ray photonelectron spl:’따'Oscopy (XPS). D Dielectric constant is measured using a metal insulator semiconductor (MIS;AVO.4 $\mu$ m thick f fIlmlp-SD s$\sigma$ucture. A chemical stoichiome$\sigma$y of 야Ie fluorocarbina$textsc{k}$영-SiOF film 따~si야영 at room temperature, which t the flow rate of Oz and FTES gas is Isccm and 6sccm, res야~tvely, is form려 야Ie SiouFo.36Co.14. A d dielec$\sigma$ic constant of this fIlm is 2.8, but the s$\alpha$'!Cimen at annealed 5OOt: is obtain려 3.24, and the s stepcoverage in the 0.4 $\mu$ m and 0.5 $\mu$ m pattern 킹'C above 92% and 91% without void, res야~tively. res야~tively.
Purpose: Some of the properties of the prosodic phrasing and some acoustic and phonological effects of contrastive focus on the tonal pattern of Seoul Korean is explored based on a brief experiment of analyzing the fundamental frequency(=FO) contour of the speech of the author. Data Base and Analysis Procedures: The examples were chosen to contain mostly nasal and liquid consonants, since it is difficult to track down the formants in stops and fricatives during their corresponding consonantal intervals and stops may yield an effect of unwanted increase in the FO value due to their burst into the following vowel. All examples were recorded three times and the spectrum of the most stable repetition was generated, from which the FO contour of each sentence was obtained, the peaks with a value higher than 250Hz being interpreted as a high tone (=H). The result is then discussed within the prosodic hierarchy framework of Selkirk (1986) and compared with the tonal pattern of the Northern Kyungsang dialect of Korean reported in Kenstowicz & Sohn (1996). Prosodic Phrasing: In N.K. Korean, H never appears both on the object and on the verb in a neutral sentence, which indicates the object and the verb form a single Phonological Phrase ($={\phi}$), given that there is only one pitch peak for each $={\phi}$. However, Seoul Korean shows that both the object and the verb have H of their own, indicating that they are not contained in one $={\phi}$. This violates the Optimality constraint of Wrap-XP (=Enclose a lexical head and its arguments in one $={\phi}$), while N.K. Korean obeys the constraint by grouping a VP in a single $={\phi}$. This asymmetry can be resolved through a constraint that favors the separate grouping of each lexical category and is ranked higher than Wrap-XP in Seoul Korean but vice versa in N.K. Korean; $Align-x^{lex}$ (=Align the left edge of a lexical category with that of a $={\phi}$). (1) nuna-ka manll-ll mEk-nIn-ta ('sister-NOM garlic-ACC eat-PRES-DECL') a. (LLH) (LLH) (HLL) ----Seoul Korean b. (LLH) (LLL LHL) ----N.K. Korean Focus and Phrasing: Two major effects of contrastive focus on phonological phrasing are found in Seoul Korean: (a) the peak of an Intonatioanl Phrase (=IP) falls on the focused element; and (b) focus has the effect of deleting all the following prosodic structures. A focused element always attracts the peak of IP, showing an increase of approximately 30Hz compared with the peak of a non-focused IP. When a subject is focused, no H appears either on the object or on the verb and a focused object is never followed by a verb with H. The post-focus deletion of prosodic boundaries is forced through the interaction of StressFocus (=If F is a focus and DF is its semantic domain, the highest prominence in DF will be within F) and Rightmost-IP (=The peak of an IP projects from the rightmost $={\phi}$). First Stress-F requires the peak of IP to fall on the focused element. Then to avoid violating Rightmost-IP, all the boundaries after the focused element should delete, minimizing the number of $={\phi}$'s intervening from the right edge of IP. (2) (omitted) Conclusion: In general, there seems to be no direct alignment constraints between the syntactically focused element and the edge of $={\phi}$ determined in phonology; all the alignment effects come from a single requirement that the peak of IP projects from the rightmost $={\phi}$ as proposed in Truckenbrodt (1995).
Kim, Mi-Suk;Chung, Young-Ryun;Suh, Euy-Hoon;Song, Won-Sup
ALGAE
/
v.17
no.2
/
pp.105-115
/
2002
Influences of vrious environmental factors on the eutrophication of Nakdong River were analyzed statistically using water samples collected from 1 January, 1999, to 30 September, 2001 at Namji area. The relationships between the concentration of chlorophyll α (eutrophication index) and environmental factors and were analyzed to develop a statistical model which can predict the status of eutrophication. The concentation of chlorophyll α ranged from 66.2 mg · $m^{-3}$ to 70.8 mg · $m^{-3}$ during dry winter season and the average concentration during this study period was 35.5 mg · $m^{-3}$ Namji area of Nakdong River was in the hypereutrohic stage in terms of water quality. Stephanodiscus sp. and Aulacoseria granulata var. angustissima were dominant species during the witnter to spring time and summer to autumn period, respectively. Based on the correlation analysis and the analysis of variance between chlorophyll α concentration and environmental factors, significantly high positive relationships were found in the order of BOD> pH> COD > KMnO₄ consumption > DO > conductivity > alkalinity. In contrast to these factors, significantly negrative relationships were found as in the order of $PO₄^{3-}-P$ >water level>the rate of Namgang-dam discharge > NH₃-N> the rate of Andong-dam discharge> the rate of Hapchoen-dam discharge. Based on the factors analysis of environmental factors on the concentration of chlorophyll α, we obtained five factors as follows. The first factor included water level, pH, turbiditiy, conductivity, alkalinity and the rate of Namgang-dam discharge. The second factor included water temperature DO, NH₄+-N, NO₃- -N. The third factor included KMnO₄ consumption COD and BOD. The fourth factor included the rate of Andong-dam discharge, the rate of Hapcheon-dam discharge, and the rate of Imha-dam discharge. The final factor included T-N T-P and $PO₄^{3-}-P$ > concentration. We derived two statistica models that can predict the occurrence of eutrophication based on the factors by factor analysis, using regression analysis. The first model is the stepwise regression model whose independent variables are the factors produced by factor analysis : chl α (mg · $m^{-3}$ = 42.923+(18.637 factor 3) + (-17.147 factor 1) + (-12.095 factor 5) + (-4.828 factor 4). The second model is the alternative stepwise regression model whose independent variables are the sums of the standardized main component variables:chl α (mg · $m^{-3}$ = 37.295+(7.326 Zfactor 3) + (-2.704 Zfactor 1)+(-2.341 Zfactor 5).
The optimal condition of in vitro regeneration and transformation were investigated for newly bred potato varieties in Korea. Leaf and internodal stem tissues of 'Chubak', 'Namsuh', 'Jasim', 'Jopung' and 'Jowon' were used to investigate the influence of growth regulator on regeneration efficiency The effect of phenolic compound acetosyringone on gene transformation efficiency was also investigated. Leaf tissue of 'Jowon' and internodal stem tissues of 'Jopung' were showed high regeneration efficiency on M5 medium supplemented with 0.1 mg/L GA₃, 2.0 mg/L Zeatin and 0.01 mg/L NAA. The other three potato cultivars were showed low regeneration efficiency less than 25%. The effect of acetosyringone on Agrobacterium-mediated gene transformation with leaf and internodal stem tissues were noticeable. By adding the 75 μM of acetosyringone during the Agrobacterium innoculation, the transformation efficiency was increased up to 1.5∼4.0 fold compare to non-treated control. In case of 'Jowon' the transformation efficiency was 87.9% in leaf tissue and 'Jopung' was 68.4% in internodal stem tissues.
The study was carried out to find out the changes of the sex hormone concentrations in the blood plasma and antrum of follicular and lutein cystic ovaries of Holstein cows. The progesterone, estradiol-17$\beta$, testosterone, FSH and LH from samples of the blood plasma and antrum of cystic ovaries of cows assayed by radioimmunoassay method. The results of this study were summarized as follows : 1. The concentrations fo progesterone and estradiol-17$\beta$ in the blood plasmaat estrous and luteal phase were 0.95$\pm$0.18ng/ml, 11.45$\pm$3.12pg/ml and 4.25$\pm$0.27ng/ml, 6.27$\pm$0.82pg/ml respectively. The concentrations of progesterone and estradiol-17$\beta$ in the antrum fluid of follicles at estrous and luteal phase were 24.8$\pm$4.12ng/ml, 54.3$\pm$7.25pg/ml and 21.7$\pm$3.79ng/ml, 14.3$\pm$2.72pg/ml respectively, and showed significant changes among the estrous and luteal phase and blood plasma and antrum fluid of follicles. 2. The concentrations of progesterone, estradiol-17$\beta$, testosterone and LH in the blood plasma of follicular cystic ovareis of cows were 0.85$\pm$0.25ng/ml, 9.23$\pm$2.72pg/ml, 17.12$\pm$3.26pg/ml and 3.78$\pm$1.02mIU/ml respectively. And the concentrations of progesterone, estradiol-17$\beta$, testosterone and LH in the antrum fluid of follicular cystic ovareis of cows were 284$\pm$48.21ng/ml, 389$\pm$67.23ng/ml, 12.84$\pm$0.29ng/ml and 1.84$\pm$0.17mIU/ml respectively, and showed significant changes between in the blood plasma and antrum fluid of cystic ovaries. 3. The concentrations of progesterone, estradiol-17$\beta$, testosterone and LH in the blood plasma of lutein cystic ovaries of cows were 3.40$\pm$0.78ng/ml, 4.02$\pm$0.42pg/ml, 10.72$\pm$2.74pg/ml and 0.76$\pm$0.12mIU/ml respectively. And the concentrations of progesterone, estradiol-17$\beta$, testosterone and LH in the antrum fluid of lutein cystic ovareis of cows were 427$\pm$35.79ng/ml, 0.76$\pm$0.07ng/ml, 3.45$\pm$0.57ng/ml and 0.29$\pm$0.07mIU/ml respectively, and showed significant changes between the blood plasma and antrum fluid of cystic ovaries. 4. Accordingly, the diagnosis of follicular and lutein cystic ovareis of cows from progesterone, estradiol-17$\beta$ and LH levels in the blood plasma and antrum of cystic ovaries of cows is thought to be possible a diagnostic means.
To provide the optimal culture conditions for the developm,ent of in vit개 produced embryos, we have been investigated various culture media as well as co-cultrue systems using porcine cumulus cells or mouse fetal fibroblast cells. Porcine ovaries were brought to the laboratory from local slaughter house within 1 hour after slaughtering and cumulus oocytes complexes were recovered from antral follicles(3~5mm) with 23 gauge needle. To maturate follicular oocytes, cumulus oocytes complexes were washed three times with TCM-199 containing 25mM HEPES and incubated(39$^{\circ}C$, 5% CO2 in air) in various maturation media for 42 hrs. Ejaculated and liquid storaged boar spermatozoa capacitated with different sperm capacitation methods and media were rpepared for fertilizing of matured follicular oocytes in vitro. Fertilization was performed by adding 5~10${\mu}\ell$ fo capacitated spermatozoa containing 1~5$\times$105 sperm/ml to droplets. Eighteen to twenty-eight hours after sperm insemination, fertilized eggs were washed three times with culture media and transferred to the various culture media, to the culture media with a monolayer of somatic cells. The in vitro development rates of 1-cell embryos cultured with three times with culture media and transferred to the various culture media, to the culture media with a monolayer of somatic cells. The in vitro development rates of 1-cell embryos cultured with three different media, m-KRB, BECM and TCM-HEPES were 0~1.0%, showing extremely lower rates. Especially, most of embryos were observed to arrest the development beyond 4-cell stages. The rates of embryos developed to 2-, 4-, 8-, 16-, 32-cell and morula or blastocyst stage in co-culture with porcine cumulus cells and mouse fetal fibroblast cells were 61.1~67.0%, 59.0~58.0%, 42.5~43.1%, 28.4~30.2% and 20.4~21.0%, respectively. These development rates upto morula or blastocyst stages were significantly higher than those of the embryos cultured in the basic culture medium(P<0.01). These findings suggest that co-culture of in vitro fertilized eggs with porcine cumulus cells or mouse fetal fibroblast cells enhance the development of fertilized eggs to morula or blastocyst stage in vitro.
This paper describes a l0b CMOS A/D converter (ADC) for HDTV applications. The proposed ADC adopts a typical multi-step pipelined architecture. The proposed circuit design techniques are as fo1lows: A selective channel-length adjustment technique for a bias circuit minimizes the mismatch of the bias current due to the short channel effect by supply voltage variations. A power reduction technique for a high-speed two-stage operational amplifier decreases the power consumption of amplifiers with wide bandwidths by turning on and off bias currents in the suggested sequence. A typical capacitor scaling technique optimizes the chip area and power dissipation of the ADC. The proposed ADC is designed and fabricated in s 0.8 um double-poly double-metal n-well CMOS technology. The measured differential and integral nonlinearities of the prototype ADC show less than ${\pm}0.6LSB\;and\;{\pm}2.0LSB$, respectively. The typical ADC power consumption is 119 mW at 3 V with a 40 MHz sampling rate, and 320 mW at 5 V with a 50 MHz sampling rate.
This study was carried out to know whether $\beta$-galactosidase is directly important or not on fruit softening during the development of peach fruits compared to those in the stage stage. It was investigated that the flesh firmness, cell wall components, and the glycosidase activities of the peach fruits with a fast softening cultivar, 'Mibeakdo', a slow softening cultivar,'Yumyung'and a middle softening cultivar, 'Okubo$\beta$, at different developmental stages, on 13 May, 16 June, 16 July, and 5 August and on 28 August which harvested only 'Yumyung' fruits. In order to investigate the amounts of total sugar and non-cellulosic neutral sugar, the cell wall materials of each fruit were solubilized in distilled water, 0.05M CDTA, 0.05M Na$_2$CO$_3$, 4% KOH, and 24% KOH sequentially. During the fruit development, the fruit firmness of three cultivars decreased and the fruit firmness of 'Yumyung' was higher than that fo 'Mibeakdo' and 'Okubo' in the overall period. During the fruit development, the changes of total sugar amounts of each measured fractions were similar among peach cultivars. Arabinose and galactose were the predominant non-cellulosic neutral sugars in all the fractions including cell wall material of the three cultivars. There was an active relationship between the changes of flesh firmness in three cultivars and the mol % changes of rhamnose on 5 August which was the harvest date of 'Mibeakdo' and 'Okubo' fruits. The activity of soluble $\beta$-galactosidase was high at the early developmental stage and then dropped to a very low activity level in all cultivars. The activity of cell wall-bound $\beta$-galactosidase was high at the early developmental stage and then decreased continuously through the harvest date. In addition the changes of other glycosidase activities were similar among cultivars.
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