The aim of this paper is to analyse difficulties of the pronunciation in swedish vowels encountered by Koreans learners and to seek solutions in order to correct the possible errors. In the course of the analysis the swedish and Korean vowels in question are compared with the purpose of describing differences aha similarities between these two systems. This contrastive description is largely based on the students' articulatory speech level ana the writer's auditory , judgement . The following points are discussed : 1 ) Vowel length as a distinctive feature in Swedish compared with that of Korean. 2) A special attention is paid on the Swedish vowel [w:] that is characterized by its peculiar type of lip rounding. 3) The six pairs of Swedish vowels that are phonologically contrastive but difficult for Koreans to distinguish one from the other: [y:] ~ [w:], [i:] ~ [y:], [e:] ~ [${\phi}$:], [w;] ~ [u:] [w:] ~ [$\theta$], [$\theta$] ~ [u] 4) The r-colored vowel in the case of the postvocalic /r/ that is very common in American English is not allowed in English sound sequences. The r-colored vowel in the American English pattern has to be broken up and replaced hi-segmental vowel-consonant sequences . Korean accustomed to the American pronunciation are warned in this respect. For a more distinct articulation of the postvocalic /r/ trill [r] is preferred to fricative [z]. 5) The front vowels [e, $\varepsilon, {\;}{\phi}$) become opener variants (${\ae}, {\;}:{\ae}$] before / r / or supradentals. The results of the analysis show that difficulties of the pronunciation of the target language (Swedish) are mostly due to the interference from the Learner's source language (Korean). However, the Learner sometimes tends to get interference also from the other foreign language with which he or she is already familiar when he or she finds in that language more similarity to the target language than in his or her own mother tongue. Hence this foreign language (American English) in this case functions as a second language for Koreans in Learning Swedish.
Kim Mi-Young;Lee Sunkyung;Yi Kyu Yang;Yoo Sung Eun;Lee Dong-Ha;Lim Hong;Kim Ho Soon;Lee Soo Hwan;Baik Eun Joo;Moon Chang-Hyun;Jung Yi-Sook
Archives of Pharmacal Research
/
v.28
no.12
/
pp.1358-1364
/
2005
In this study, we investigated whether a novel anti-ischemic $K_{ATP}$ opener KR-31378 [(2S,3S,4R)N'-cyano-N-(6-amino-3,4-dihydro-3-hydroxy-2 -methly-2-dimethoxymethly-2H-benzopyran-4-yl)N'-benzylguanidine] has protective effect against oxidative stress-induced death in heart-derived H9c2 cells. Cell death was induced by BSO, butionine sulfoximine, which inhibits GSH synthesis and subsequently increases reactive oxygen species (ROS) level. Cell death was quantitatively determined by measuring lactate dehydrogenase (LDH) activity and stained by Hoechst 33258. BSO-induced ROS production and mitochondrial membrane potential (MMP) were measured using 2',7'-dichlorofluorescein diacetate oxidation and rhodamine 123, respectively. Both the LDH release and the ROS elevation induced by treatment of H9c2 cells with 10 mM BSO, were significantly decreased by KR-31378. These protective effect and antioxidant effect of KR-31378 appeared to be independent on $K_{ATP}$ channel opening. Cells exposed to BSO showed an early reduction in MMP, and this reduction in MMP was significantly reversed by treatment with KR-31378. Caspase-3 activity in BSO treated H9c2 cells was remarkably increased, and this increased caspase-3 activity was significantly reversed by KR-31378. In conclusion, our results suggest that KR-31378 can produce cardioprotective effect against oxidative stress-induced cell death through antioxidant mechanism.
Kang, Jung-Il;Oh, Tae Heon;Kim, Jioh;No, Haemin;Lee, Nam Ho;Yoo, Eun-Sook;Kang, Hee-Kyoung
Korean Journal of Pharmacognosy
/
v.52
no.3
/
pp.134-142
/
2021
This study was conducted to evaluate the effects of Dictyota coriacea extract and its active components such as 1,9-dihydroxycrenulide and epiloliolide on the hair growth. Treatment with D. coriacea extract and the hexane and EtOAc fractions of D. coriacea extract significantly increased the proliferation of dermal papilla cells (DPCs), a central regulator of the hair cycle. Especially, 1,9-dihydroxycrenulide and epiloliolide from D. coriacea extract, caused an increase in the DPC proliferation. When isolated rat vibrissa follicles were treated with 1,9-dihydroxycrenulide or epiloliolide for 21 d, the hair-fiber lengths for the vibrissa follicles increased. When examined the activity of 5α-reductase, which converts testosterone to dihydrotestosterone (DHT), a main cause of androgenetic alopecia, the several solvent fractions of D. coriacea extract significantly decreased the 5α-reductase activity while 1,9-dihydroxycrenulide and epiloliolide scarcely inhibited 5α-reductase activity. In addition, we found that the D. coriacea extract and several solvent fractions of D. coriacea extract could not act as a KATP channel opener, which could be a contributory factor in the effect on hair growth. These results suggest that D. coriacea extract and 1,9-dihydroxycrenulide and epiloliolide, principals of D. coriacea, have the potential to treat alopecia via the proliferation of DPCs.
Arun Kumar Tiwari;Pushpraj S Gupta;Mahesh Prasad;Paraman Malairajan
Journal of Pharmacopuncture
/
v.25
no.4
/
pp.369-381
/
2022
Objectives: Hyperlipidemia (HL) is a major cause of ischemic heart diseases. The size-limiting effect of ischemic preconditioning (IPC), a cardioprotective phenomenon, is reduced in HL, possibly because of the opening of the mitochondrial permeability transition pore (MPTP). The objective of this study is to see what effect pretreatment with Inula racemose Hook root extract (IrA) had on IPC-mediated cardioprotection on HL Wistar rat hearts. An isolated rat heart was mounted on the Langendorff heart array, and then ischemia reperfusion (I/R) and IPC cycles were performed. Atractyloside (Atr) is an MPTP opener. Methods: The animals were divided into ten groups, each consisting of six rats (n = 6), to investigate the modulation of I. racemosa Hook extract on cardioprotection by IPC in HL hearts: Sham control, I/R Control, IPC control, I/R + HL, I/R + IrA + HL, IPC + HL, IPC + NS + HL, IPC + IrA+ HL, IPC + Atr + oxidative stress, mitochondrial function, integrity, and hemodynamic parameters are evaluated for each group. Results: The present experimental data show that pretreatment with IrA reduced the LDH, CK-MB, size of myocardial infarction, content of cardiac collagen, and ventricular fibrillation in all groups of HL rat hearts. This pretreatment also reduced the oxidative stress and mitochondrial dysfunction. Inhibition of MPTP opening by Atr diminished the effect of IrA on IPC-mediated cardioprotection in HL rats. Conclusion: The study findings indicate that pretreatment with IrA e restores IPC-mediated cardioprotection in HL rats by inhibiting the MPTP opening.
Yang, Jaewon;Whang, Soo Yeon;Hwang, In-Sook;Kim, Sun-Mee;Bae, Gi-Hye;Lee, Hong-Jae;Ko, Young-Hoon
Korean Journal of Psychosomatic Medicine
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v.21
no.1
/
pp.62-71
/
2013
Objectives : The purpose of this study is to investigate the characteristics of drinking patterns and the prevalence of hazardous drinking and alcohol use disorder with the assessment of alcohol policy needs in community population of urban city in Korea. Methods : Data was collected from 1,000 residents in a single urban city in Korea, from June 1 to July 31, 2011 by a questionnaire. As research tools, socio-demographic characteristics composed of variables based on study purpose, alcohol problems and alcohol use disorder state scales composed with Alcohol Use Disorder Identification Test(AUDIT) and Cut down, Annoyed, Guilty, Eye-opener(CAGE), and the assessment of alcohol policy needs in community population questions were used. Results : The lifetime experience of alcohol drinking was 97.4%. For the frequency of drinking, 21.9% of population responded 2 to 4 times per weekly. 24.4% of male had one time or more high risk drinking, defined as having four or more drinks in a sitting, per week. 51.6% experienced the first time drinking of alcohol in adolescence. The lifetime prevalence of hazardous drinking and alcohol use disorder were 14.9% and 3.3%, respectively using AUDIT. Alcohol use disorder were 9.6% with the CAGE scale. Problem drinking were 8.4% in this study. They requested the program such as prevention education(57.2%), construction of liaison system to treatment facilities(50.1%), alcohol counseling and intervention(41.7%), and rehabilitation program(39.8%). Conclusions : These results demonstrate that alcohol problem and alcohol use disorder were much prevalent, and these problem started in the earlier age. It is necessary to develop an effective alcohol prevention program or policy with considering the needs in community population.
$K^+$ channel openers (KCOs) are known to have a wide range of effects by opening the $K^+$ channel in plasma membranes of various smooth muscles, cardiac muscle and pancreatic ${\beta}-cell$. In the present study, we investigated the effects of 5 types of KCOs, cromakalim, RP49356, pinacidil, nicorandil and diazoxide on the contractility of isolated rat uterus. All KCOs tested inhibited the uterine contraction induced by 0.2 nM oxytocin in a dose-dependent manner. Individual KCO and its $pD_2$ values were cromakalim 6.5, RP49356 6.3, pinacidil 5.92, nicorandil 4.43 and diazoxide 4.18. The relaxant effects of KCO were inhibited by glibenclamide (0.3, 1 and $10\;{\mu}M$) with $pA_2$ values of cromakalim 6.91, RP49356 6.59, pinacidil 6.55, nicorandil 5.97 and diazoxide 6.37. In addition, the relaxant effect of cromakalim or pinacidil was antagonised by TEA, a non-selective $K^+$ channel blocker, but not by apamin. Contractions induced by low concentration of KCI (< 40 mM) were inhibited by cromakalim $(100{\mu}M)$ and nicorandil $(300{\mu}M)$, but those evoked by higher concentration (> 40 mM) of KCI were little affected. In ovariectomized rat uterus, cromakalim dose-dependently inhibited oxytocin-induced contraction and glibenclamide $(10{\mu}M)$ inhibited the relaxant effect of cromakalim with $pD_2$ and $K_B$ values of 7.48 and $1.26{\times}10^{-7}M$, respectively. In estrogen-primed rat uterus, these values were 6.51 and $1.57{\times}10^{-7}M$, respectively, indicating that the cromakalim is less effective on the estrogen-treated uterine smooth muscle. Our results suggest that the KCO-sensitive $K^+$ channels participate in the motility of uterine smooth muscle and such channels are, at least in part, under the control of estrogen. In addition, our data Indicate that the type of $K^+$ channels activated by KCO is ATP-sensitive $K^+$ channels which is blocked by glibenclamide.
Park, Ji-Young;Kim, Hyun-Hee;Yoo, Sung-Eun;Hong, Ki-Whan
The Korean Journal of Physiology and Pharmacology
/
v.1
no.6
/
pp.759-767
/
1997
In the present study, we characterized the non-vascular smooth muscle relaxant effects of a novel benzoyran derivative ,SKP-450 (2-[2'(1',3'-dioxolone)-2-methyl-4- (2'-oxo-1'-pyrrolidinyl) -6-nitro-2H-1- benzopyran) and its metabolite, SKP-310, in comparison with levcromakalim (LCRK). In the rat stomach fundus, the spontaneous motility stimulated by $10^{-6.5}\;M$ bethanechol was completely eliminated not only by $10^{-7}\;M$ SKP-450 but also by $10^{-6}\;M$ LCRK, which were blocked by $10^{-6}\;M$ glibenclamide. The inhibitory effect of SKP-450 $pD_2,\;3.94{\pm}0.66)$ was much less than LCRK $(pD2,\;5.73{\pm}0.38,\;p<0.05)$. In the bethanechol $(10{-6.5 }\;M)-stimulated$ urinary bladder, the tonus was decreased in association with elimination of spontaneous motility by $10^{-7}\;M$ M SKP-450 and $10^{-6}\;M\;LCRK\;(pD2,\;6.77{\pm}0.06)\;(P<0.05)$, which were inhibitable by $10^{-6}\;M$ glibenclamide. The inhibitory effect of SKP-450 $(pD2,\;7.66{\pm}0.05)$ was significantly more potent than that of LCRK $(pD2,\;6.77{\pm}0.06,\;p<0.05)$. In the rat uterus stimulated by $PGF_{2\alpha}\;(10^{-7}\;M)$, both increased tonus and spontaneous motility were eliminated by $10^{-6}\;M$ LCRK with slight depression of the tonus, but not by SKP-450 $(10^{-5}\;M)$. The stimulated trachea of guinea-pig by $10^{-6.5}\;M$ bethanechol was moderately suppressed by SKP-450 $(10^{-6}{sim}10^{-5}\;M)$ but little by SKP-310. In association with the relaxant effects, SKP-450 $(10^{-6}\;M)$ and LCRK $(10^{-5}\;M)$ caused a significant stimulation of the $^{86}Rb$ efflux from rat urinary bladder and stomach fundus, which were antagonized by $10^{-5}\;M$ glibenclamide, whereas the $K^+$ channel openers could not exert a stimulation of the $^{86}Rb$ efflux from rat uterus. In conclusion, it is suggested that SKP-450 exerts potent relaxant effects on the urinary bladder detrusor muscle and duodenum, whereas it shows much less effect on stomach fundus and uterus as contrasted to LCRK.
ATP-sensitive $K^+$ channels ($K_{ATP}$) were not identified in gastric smooth muscle cells. However, in tension recording of intact gastric circular muscle, lemakalim of $K_{ATP}$ channels opener in other tissues suppressed mechanical contractions and this effect was blocked by glibenclamide, a specific inhibitor of $K_{ATP}$ channels. The aims of this study were to investigate whether $K_{ATP}$ channels exist in gastric smooth muscle of guinea-pig and to know its physiological role. Whole cell $K^+$ currents activated by lemakalim were recorded from freshly isolated cells with a 0.1 mM ATP, 140 mM KCl pipette solutions. Lemakalim (10 ${\mu}M$) increased inward currents of $-224{\pm}34$ pA (n=13) at -80 mV of holding potential in bath solution contained 90 mM $K^+$. Bath-applied glibenclamide (10 ${\mu}M$) inhibited the lemakalim-activated inward currents by $91{\pm}6%$ (n=5). These lemakalim-activated inward currents were reduced by increased intracellular ATP from 0.1 to 3 mM ($-41{\pm}12$ pA) (n=5). The reversal potential of the glibenclamide- sensitive inward currents was $-5.2{\pm}2.4$ mV (n=3) in external 90 mM $K^+$ and shifted to $-14.8{\pm}3.6$ mV (n=3) in external 60 mM $K^+$, which close to equilibrium potential of $K^+$ ($E_K$). External barium and cesium inhibited the lemakalim-activated inward currents dose-dependently. The half-inhibitory dose ($IC_{50}$) of barium and cesium were 2.3 ${\mu}M$ (n=5) and 0.38 mM (n=4), respectively. 10 mM tetraethylammonium (TEA) also inhibited the lemakalim-activated inward currents by $66{\pm}15%$ (n=5). Both substance P (SP) (5 ${\mu}M$) and acetylcholine (ACh) (5 ${\mu}M$) inhibited lemakalim-activated inward currents. These results suggest that $K_{ATP}$ channels exist in the gastric smooth muscle and its modulation by neurotransmitters may play an important role in regulating gastric motility.
In the present study, it was aimed to further indentify the intracellular action mechansm of cromakalim and levcromakalim in the porcine coronary artery. In intact porcine coronary arterial strips loaded with fura-2/AM, acetylcholine caused an increase in intracellular free $Ca^{2+}$$([Ca^{2+}]_i)$ in association with a contraction in a concentration-dependent manner. Cromakalim (1 ${\mu}M$) caused a reduction in acetylcholine-induced increased $[Ca^{2+}]_i$ not only in the mormal physiological salt solution (PSS) but also in $Ca^{2+}$-free PSS (containing 1 mM EGTA). In the skinned strips prepared by exposure of tissue to 20 .${\mu}M$ B-escin, inositol 1,4,5-trisphosphate ($IP_3$) evoked an increase in $[Ca^{2+}]_i$, but it was without effect on the intact strips. The $IP_3$-induced increase in $[Ca^{2+}]_i$ was inhibited by cromakalim by 78% and levcromakalim by 59% (1 .${\mu}M$, each). Pretreatment with glibenclamide (a blocker of ATP-sensitive $K^+$ channels, 10 .${\mu}M$) and apamin (a blocker of small conductance $Ca^{2+}$-activated $K^+$ channels, 1 .${\mu}M$) strongly blocked the effect of cromakalim and levcromakalim. However, charybdotoxin (a blocker of large conductance $Ca^{2+}$-activated $K^+$ channels, 1 .${\mu}M$) was without effect. In addition, cromakalim inhibited the $GTP{\gamma}S$ (100 .${\mu}M$, non-hydrolysable analogue of GTP)-induced increase in $[Ca^{2+}]_i$. Based on these results, it is suggested that cromakalim and levcromakalim exert a potent vasorelaxation, in part, by acting on the $K^+$ channels of the intracellular sites (e.g., sarcoplasmic reticulum membrane), thereby, resulting in decrease in release of $Ca^{2+}$ from the intracellular storage site.
The aim of the present study was to elucidate the direct effects of melatonin on bladder activity and to determine the mechanisms responsible for the detrusor activity of melatonin in the isolated rat bladder. We evaluated the effects of melatonin on the contractions induced by phenylephrine (PE), acetylcholine (ACh), bethanechol (BCh), KCl, and electrical field stimulation (EFS) in 20 detrusor smooth muscle samples from Sprague-Dawley rats. To determine the mechanisms underlying the inhibitory responses to melatonin, melatonin-pretreated muscle strips were exposed to a calcium channel antagonist (verapamil), three potassium channel blockers [tetraethyl ammonium (TEA), 4-aminopyridine (4-AP), and glibenclamide], a direct voltage-dependent calcium channel opener (Bay K 8644), and a specific calcium/calmodulin-dependent kinase II (CaMKII) inhibitor (KN-93). Melatonin pretreatment ($10^{-8}{\sim}10^{-6}M$) decreased the contractile responses induced by PE ($10^{-9}{\sim}10^{-4}M$) and Ach ($10^{-9}{\sim}10^{-4}M$) in a dose-dependent manner. Melatonin ($10^{-7}M$) also blocked contraction induced by high KCl ($[KCl]_{ECF}$; 35 mM, 70 mM, 105 mM, and 140 mM) and EFS. Melatonin ($10^{-7}M$) potentiated the relaxation response of the strips by verapamil, but other potassium channel blockers did not change melatonin activity. Melatonin pretreatment significantly decreased contractile responses induced by Bay K 8644 ($10^{-11}{\sim}10^{-7}M$). KN-93 enhanced melatonin-induced relaxation. The present results suggest that melatonin can inhibit bladder smooth muscle contraction through a voltage-dependent, calcium-antagonistic mechanism and through the inhibition of the calmodulin/CaMKII system.
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