• Title/Summary/Keyword: S-63

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ATP Modulation of Cloned Rat Brain Large-conductance $Ca^{2+}$-activated $K^+$ Channel by Protein Phosphorylation

  • Park, S.Y.;S. Chung
    • Proceedings of the Korean Biophysical Society Conference
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    • 1999.06a
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    • pp.63-63
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    • 1999
  • Large conductance $Ca^{2+}$-activated $K^{+}$ channels (Maxi-K channel) have been implicated in many important physiological processes such as co-ordination of membrane excitability in neurons. Modulation of these channels are archived by the activity of various protein kinases. The most widely studied example of Maxi-K channel regulation by protein phosphorylation has been obtained using plasma membranes from the rat brain incorporated into lipid bilayers.(omitted)

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Commutativity Criteria for a Factor Ring R/P Arising from P-Centralizers

  • Lahcen Oukhtite;Karim Bouchannafa;My Abdallah Idrissi
    • Kyungpook Mathematical Journal
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    • v.63 no.4
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    • pp.551-560
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    • 2023
  • In this paper we consider a more general class of centralizers called I-centralizers. More precisely, given a prime ideal P of an arbitrary ring R we establish a connection between certain algebraic identities involving a pair of P-left centralizers and the structure of the factor ring R/P.

Treasury Stock Sales and Management Rights Protection: Conflicts of Interest between an Owner-manager and Small Shareholders

  • CHO, SUNG ICK
    • KDI Journal of Economic Policy
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    • v.39 no.3
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    • pp.63-98
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    • 2017
  • This paper investigates the sales process of treasury stocks, while most previous research studies treasury stock repurchases. The sales of treasury stocks are an important measure to protect management rights only in Korea, as Korea's laws and systems allow treasury stock sales according to the board's resolution and not by the decisions made at the general shareholders' meetings. The board's resolution, which considers the owner-manager's interest on management rights, can cause damages to small shareholders. Considering (i) the economic characteristics of treasury stocks, (ii) other countries' institutions and experiences, (iii) a theoretical assessment of the possibility of small shareholder losses, and (iv) lessons from Korea's actual instances, Korea's present system should be corrected at least in the mid and long term. Even in the short-term, rules pertaining to sales enacted by the board's resolution inducing small shareholder losses should be overhauled. The autonomous discipline by various stakeholders could be an ideal measure by which to monitor ownermanager's decisions. In addition, temporary intervention measures, such as government examinations, could be implemented to protect small shareholders.

Studies of Growth according to the Concentration of Mineral Elements of Medium in Cyanophyte SG63 (배양액의 염도에 따른 남조식물 (SG 63)의 생장 연구)

  • 김미경
    • Journal of Plant Biology
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    • v.35 no.1
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    • pp.1-8
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    • 1992
  • The characteristic of Cyanophyte genus SG63 is similar to that of Aphanot hece sp. The optimal growth was found with the concentration of NaCI and $MgSO_4{\cdot}7H_2O$ on the culture medium. The most optimal condition is 56%0 of NaCl (S4 medium) and 20%0 of $MgSO_4{\cdot}7H_2O$ (M2 medium). The synthesis of chlorophyll a, phycocyanin and soluble proteins is affected by the concentration of the two mineral elements in culture. Especially, the content of chlorophyll a and phycocyanin decreases on the most highly saline medium. The identified principal carotenoids are ${\beta}-carotene$, echinenone, zeaxanthin and myxoxanthophyll. The rates of concentration of protein/chlorophyll a and phycocyanin/chlorophyll a are low on the S4 medium. Inversely, these rates are the highest on the M2 medium. Accordingly, the high concentration of $MgSO_4{\cdot}7H_2O$ provoke the synthesis of phycocyanin and total proteins.oteins.

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JNK/SAPK Is Required in Nitric Oxide-Induced Apoptosis in Osteoblasts

  • Kang, Young-Jin;Chae, Soo-Wan
    • Archives of Pharmacal Research
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    • v.26 no.11
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    • pp.937-942
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    • 2003
  • Nitric oxide(NO) induces apoptosis in human osteoblasts. Treatment with exogenous NO donors, SNAP (S-Nitroso-N-acelylpenicillamine) and SNP (sodium nitroprusside), to MG-63 osteoblasts resulted in apoptotic morphological changes, as shown by a bright blue-fluorescent condensed nuclei and chromatin fragmentation by fluorescence microscope of Hoechst 33258-staining. The activities of caspase-9 and the subsequent caspase-3-like cysteine proteases were increased during NO-induced cell death. Pretreatment with Z-VAD-FMK (a pancaspase inhibitor) or Ac-DEVD-CHO (a specific caspase-3 inhibitor) abrogated the NO-induced cell death. The NO donor markedly activated JNK, a stress-activated protein kinase in the human osteoblasts. This study showed that the inhibition of the JNK pathway markedly reduced NO-induced cell death. But neither PD98059 (MEK inhibitor) nor SB203580 (p38 MAPK inhibitor) had any effect on NO-induced death. Taken together, these results suggest that JNK/SAPK may be related to NO-induced apoptosis in MG-63 human osteoblasts.

Designed S-63 electronic nautical system using mobile (모바일을 활용한 S-63 전자해도 시스템 설계)

  • Kim, Gyu-Hyun;Jang, Jong-Wook
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • 2015.05a
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    • pp.319-322
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    • 2015
  • There are Marine equipment, electronic chart display and information system(ECDIS) which can make a voyage using sounding machine in vessel. ECDIS current systems do not have a unified protocol between devices installed in the sea. But protocols between devices are not unified in this system. When the devices installed on the sea are replaced, communication environment should be changed. It is costly to dismantle and withdraw them so they are used without change. Due to these problems, a system being sold in the market consists of ENC system and another system receiving data seperately. In this paper, to solve these problems, it is designed to integrate and support various protocols within a system using data transmission and receiving function and streaming so that ENC can be seen via mobile as well.

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On Two Versions of Cohen's Theorem for Modules

  • Xiaolei Zhang;Wei Qi;Hwankoo Kim
    • Kyungpook Mathematical Journal
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    • v.63 no.1
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    • pp.29-36
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    • 2023
  • Parkash and Kour obtained a new version of Cohen's theorem for Noetherian modules, which states that a finitely generated R-module M is Noetherian if and only if for every prime ideal 𝔭 of R with Ann(M) ⊆ 𝔭, there exists a finitely generated submodule N𝔭 of M such that 𝔭M ⊆ N𝔭 ⊆ M(𝔭), where M(𝔭) = {x ∈ M | sx ∈ 𝔭M for some s ∈ R \ 𝔭}. In this paper, we generalize the Parkash and Kour version of Cohen's theorem for Noetherian modules to S-Noetherian modules and w-Noetherian modules.

Study on Extermination of Copepoda, Caligus curtus Parasited to Culture Paralichthys olivaceus (양식 넙치에 기생한 갑각류, Caligus curtus의 구제에 관하여)

  • Kim, Young-Gill;Lee, Keun-Kwang
    • Journal of fish pathology
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    • v.7 no.1
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    • pp.47-51
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    • 1994
  • The number of maximum 63 Caligus curtus was counted culturing P. olivaceus body surface of 20cm mean body length. respectively. Parasite sites were consist of 63.4% head, 26.9% caudal peduncle, 8.3% operculum and 1.4% the other sites. Also, the sites were secreted in larage quantity of mucus with a very small bleeding. This Caligus parasite was died 15 min to 5ppm and 5min to 10ppm masoten but 28.57% was exterminated to fresh water during the four hours. On the other hand, these Caligus parasites were not exterminated during the 30 min to 200ppm formalin.

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