• Title/Summary/Keyword: Secondary Cell

Search Result 992, Processing Time 0.032 seconds

Effect of Daeseungki-tang on Apoptotic Neuronal Cell Death of MCAO Rats (대승기탕(大承氣湯)이 중대뇌동맥 폐쇄 흰쥐의 신경세포 자연사에 미치는 영향)

  • Choi, Eun-Bin;Kim, Youn-Sub
    • Journal of Physiology & Pathology in Korean Medicine
    • /
    • v.22 no.2
    • /
    • pp.403-409
    • /
    • 2008
  • In Oriental medicine daeseungki-tang is one of the prescription that is used clinically for constipation of paralytics. The objective of the study was to observe the effect of daeseungki-tang on apoptotic neuronal cell death. In the present study, middle cerebral artery occlusion(MCAO) rats were treated with daeseungi-tang for 5 days and the edema percentage of cerebral hemisphere of MCAO rats were investigated primary. Secondary, appearances of Bax, Bcl-2,-factors that is related to apoptotic neuronal cell death - and HSP72 in the brain of MCAO rats were investigated via immunohistochemistry. Daeseungki-tang significantly decreased edema percentage of the cerebral hemisphere of MCAO rats. Daeseungki-tang significantly decreased Bax positive cells, but did not change the apperances of Bcl-2 positive cells in the penumbra of the cerebral cortex and the caudoputamen of MCAO rats. Daeseungki-tang significantly decreased HSP72 positive cells in the penumbra of the cerebral cortex, but not in the caudoputamen of MCAO rats. Based on the present results, it can be suggested that treatment with daeseungki-tang may decrease edema of the cerebral hemisphere and restrain apoptotic neuronal cell death in the penumbra of the cerebral cortex.

Studies on the Axis Formation Capacity in the Blastomeres of Early Amphibian Embryo (양서류 초기 embryo 할구의 체축 형성 능력에 관한 연구)

  • 정해문;김윤경
    • The Korean Journal of Zoology
    • /
    • v.30 no.3
    • /
    • pp.248-260
    • /
    • 1987
  • In order to investigate the importance of the prospective mesodermal and endodermal blastomeres at 32-cell stage in the anis formation, blastomeres were deleted or transplanted into the ventrovegital site of another normal embryo. The results are as follows: When the dorsomesodermal or dorsoendodermal blastomeres were deleted, there was a substantial developmental lesion in the axis structure. However, when the ventromesodermal or ventroendodermal blastomeres were deleted, the formation of an axis structure was nearly normal. The dorsomesodermal or dorsoendodermal blastomeres which were transplanted into the ventral side of the normal 32-cell embryo caused the formation of a secondary body axis, and the capacity of the second axis induction in the dorsomesodermal blastomeres was a little higher than that in the dorsoendodermal blastomeres. These results imply that both the dorsomesodermal and dorsoendodermal blastomeres are involved in the formation of a set of dorsal body structures during early embryogenesis. As well, in order to investigate the axis inducing capacity in the early cleavage embryos, the dorsovegital blastomeres were transplanted into the ventrovegital site at 4-cell, 8-cell and 16-ceIL stage respectively. As a ruts·fIt, a second body axis was formed. Therefore, it seems that the early cleavage embryo as 4-cell stage dorsal blastomeres contain some informations necessary for the axis formation.

  • PDF

A Case of Basal Cell Carcinoma Arising in Nevus Sebaceous on Scalp (머리덮개의 피부기름샘 모반에서 발생한 바닥세포암종 1례)

  • Lee, Ji Hun;Lee, Hwan Jun;Lee, Jung Min
    • Archives of Plastic Surgery
    • /
    • v.34 no.4
    • /
    • pp.493-494
    • /
    • 2007
  • Purpose: Nevus sebaceous is a distinctive growth commonly found on the scalp, forehead and retroauricular region. Nevus sebaceous has age-related changes in morphologic and histologic appearance. Secondary neoplasm including basal cell carcinoma is found in 20% of the nevus sebaceous which were not treated properly. So, we report a case of basal cell carcinoma that is arising in nevus sebaceous but has no malignant appearance. Methods: A 38 year-old female patient wanted to excise the lesion on scalp. It looked like typical nevus sebaceous because we didn't find any malignant appearances. We excised the lesion including minimal normal tissue. Results: After the excision of the lesion, pathologist reported the nevus sebaceous with multifocal basal cell carcinoma. Conclusion: Many patients want to excise the nevus sebaceous that stands out to other people. But they don't know the potency of malignant changes. So, plastic surgeons have to notify the potency and make plan for proper treatment.

Taxonomic Characteristics of Korean-native Anacardiaceae (한국산(韓國産) 옻나무과(科)의 분류학적(分類學的) 연구(硏究))

  • Kim, Sam Sik;Chung, Jae Min
    • Journal of Korean Society of Forest Science
    • /
    • v.84 no.2
    • /
    • pp.151-165
    • /
    • 1995
  • This study was conducted to establish a systematized taxonomic problems of through the leaf morphological characters and leaf venation patterns, and stomatal cell patterns and cell characteristics of abaxial and adaxial surface of the leaflets by SEM, of 6 native species in Korea and 2 foreign species of the Genus Rhus in the Family Anacardiaceae. The results obtained from this study are summarized as followings: 1. Morphological study measured 32 characters of leaves from herbarium specimen and field-collected samples for each species. The results of cluster analysis based on the Euclidean distance showed that the species could be classified into 3 groups: R. sylvestris. R. typhina, R. succedanea: R. trichocarpa. R. chinensis. R. verniciflua: and R. ambigua. R. radicans subsp. orientale, Analysis of principal components showed 5 groups: The major factors in the first principal component group was length of petiole of the terminal leaflets, that in the second group angle of left side in the terminal leaflet bash, that in the third group area ratio between first and terminal leaflets, that in the forth group angle ratio between right and left side in the terminal leaflet base, and that in the fifth group was angle of main and secondary vein at midrib of terminal leaflet. Cumulative contribution by the first, second and third principal component group was explained with 82.6%, a large percent of all information. 2. The leaf venation pattern investigated using soft X-ray photography revealed clado-and reticulo-camptodromous types according to branching angle of the secondary vein. And three groups by the developing degree of secondary vein were R. trichocarpa, R. ambigua. R. chinensis, R. typhina; R. radicans subsp. onentale, R. succedanea, R. verniciflua: and R. sylvestris. Classification key for the Rhus of Korean-native Anacardiaceae was made by the venation pattern and devevoping degree of the secondary vein. 3. The stomatal cell patterns were greatly classified into paracytic and anomocytic types, specific among species according to stomatal and subsidiary cell patterns, and various differences among the species was determined. Microstructure of the adaxial and abaxial surfaces could be divided into synclinal and anticlinal cell wall patterns, and were specific-species. Stomatal cells of R. chinensis were surrounded with characterized villus-like cells.

  • PDF

Cellulose Structures of Primary and Secondary Tissues in Pinus densiflora S. et Z. (소나무재의 1차조직과 2차조직 세포벽 중의 셀룰로오스 구조)

  • Kim, Nam-Hun;Lee, Kee-Young
    • Journal of the Korean Wood Science and Technology
    • /
    • v.29 no.1
    • /
    • pp.60-67
    • /
    • 2001
  • The microscopic characteristics and cellulose structures of primary and secondary tissues in Pinus densiflora S. et Z. were examined. Cells of primary tissue in cross section showed an irregular arrangement and round shape. Fiber lengths were 200 to $250{\mu}m$ in primary tissue, and 1,500 to $1,600{\mu}m$ in secondary tissue. Cell diameters in primary tissue were larger than those in secondary tissue; 40 to $50{\mu}m$ in former and 10 to $20{\mu}m$ in latter. Crystallite width and d-spacing of (200) in both tissues did not show any significant differences. However, crystallinity indices by Segal's method showed significant differences as 23% in primary tissue and 35% in secondary tissue. In the orientation of cellulose microfibril, primary tissues had a random pattern, whereas, secondary tissues presented an oriented pattern with 20 to 30 degree. The cellulose crystalline of primary tissue was easily transformed into cellulose II by mercerization, but that of secondary tissue hardly transformed. It is considered that the difference of crystal transformation in both tissues could be caused by the difference of lignification.

  • PDF

Flow Structure and Turbulence Characteristics in Meandering Channel (사행수로의 흐름구조 및 난류특성)

  • Seo, Il Won;Lee, Kyu Whan;Baek, Kyong Oh
    • KSCE Journal of Civil and Environmental Engineering Research
    • /
    • v.26 no.5B
    • /
    • pp.469-479
    • /
    • 2006
  • In order to investigate characteristics of the primary flow and the secondary currents in meandering channels, the laboratory experiments were conducted in S-curved channels with angle of bend, $150^{\circ}$, and sinuosity of 1.52. The experimental conditions was decided varying average depth and velocity. Under these experimental conditions, spatial variations of the secondary currents in multiple bends were observed. The experimental results revealed that the distribution of primary flow in straight section is symmetric without respect to the experimental condition and the maximum velocity line of the primary flow occurs along the shortest path in experimental channel, supporting the result of previous works. The secondary currents in second bend became more developed than those in first bend. Particularly, the outer bank cell developed distinctively and the secondary current intensity was low at the straight section and high at the bends, periodically. Also, the secondary current intensity at the bends was as twice to three times as that at the straight section, and has its maximum value at the second bend. The turbulent flow characteristics of meandering channel was investigated with turbulent intensity of the primary flow and Reynolds shear stress. It was observed that the turbulent intensity is increasing when the velocity deviation of the primary flow is large whereas Reynolds shear stress increases when both the velocity deviation of the primary flow and the secondary current are large.

On eliminating electrochemical impedance signal noise using Li metal in a non-aqueous electrolyte for Li ion secondary batteries

  • Park, Chul-Wan
    • Carbon letters
    • /
    • v.12 no.3
    • /
    • pp.180-183
    • /
    • 2011
  • Li metal is accepted as a good counter electrode for electrochemical impedance spectroscopy (EIS) as the active material in Li-ion and Li-ion polymer batteries. We examined the existence of signal noise from a Li-metal counter quantitatively as a preliminary study. We suggest an electrochemical cell with one switchable electrode to obtain the exact impedance signal of active materials. To verify the effectiveness of the switchable electrode, EIS measurements of the solid electrolyte interphase (SEI) before severe $Li^+$ intercalation to SFG6 graphite (at > ca. 0.25 V vs. Li/$Li^+$) were taken. As a result, the EIS spectra without the signal of Li metal were obtained and analyzed successfully for the following parameters i) $Li^+$ conduction in the electrolyte, ii) the geometric resistance and constant phase element of the electrode (insensitive to the voltage), iii) the interfacial behavior of the SEI related to the $Li^+$ transfer and residence throughout the near-surface (sensitive to voltage), and iv) the term reflecting the differential limiting capacitance of $Li^+$ in the graphite lattice.

Tension Wood as a Model System to Explore the Carbon Partitioning between Lignin and Cellulose Biosynthesis in Woody Plants

  • Kwon, Mi
    • Journal of Applied Biological Chemistry
    • /
    • v.51 no.3
    • /
    • pp.83-87
    • /
    • 2008
  • Tension wood, a specialized tissue developed in the upper side of the leaning stem and drooping branches of angiosperm, is an attractive experimental system attractive for exploring the development and the biochemical pathways of the secondary cell wall formation, as well as the control mechanism of the carbon flux into lignin, cellulose, and hemicellulose. However, the mechanism underlying the induction and the development of the tension wood is largely unknown. Recently, several researchers suggested the possible roles of the plant growth hormones including auxin, gibberellin, and ethylene mainly based on the expression pattern of the genes in this specialized tissue. In addition, expressed sequence tag of Poplar and Eucalyptus provide global view of the genetic control underlying the tension wood formation. However, the roles of the majority of the identified genes have not yet been clearly elucidated. The present review summarized current knowledge on the biosynthesis of tension wood to provide a brief synopsis of the molecular mechanism underlying the development of the tension wood.

Treatment Efficiency and Plant Growth of Early Stage of Pond-Wetland System at Estuary Lake (간척지 연못-습지 시스템의 질소.인 초기 처리수준 및 식물성장)

  • Yang, Hong-Mo;Choi, Soo-Myung;Yoon, Kwang-Sik
    • Proceedings of the Korean Society of Agricultural Engineers Conference
    • /
    • 2001.10a
    • /
    • pp.426-430
    • /
    • 2001
  • Treatment efficiency and plant growth of a combined Pond-Wetland system was investigated. The system is composed of primary and secondary ponds and six wetland cells. Reed and cattail were planted as vegetation of wetland cells. The removal rates of BOD, SS, T-N, and T-P were 40%, 41%, 30%, and 47% at the secondary pond, respectively. The system removal rates measured at the last wetland cell were 57%, 54%, 60%, and 68% for BOD, SS, T-N, and T-P, respectively.

  • PDF

The Electrical Characteristic of Composite Film for Lithium Secondary Battery by adding DMSO (DMSO 첨가에 따른 리튬이차전지용 복합필름의 전기적 특성)

  • 박수길;김종진;이창진;김상욱;김현후;임기조;이주성
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
    • /
    • 1997.04a
    • /
    • pp.269-272
    • /
    • 1997
  • The Lithium ion secondary battery has been developed for high energy density of portable electrical device and electronics. Among the many conductive polymer materials, the positive active film for Li polymer battery system was synthesized successfully from polyphenylene diamine(PPD) by chemical polymerization in our lab. And PPD-DMcT(2, 5-dimercapto-1, 3, 4-thi-adiazole) composite flim conductive material, at high temperature was also prerared with the addition of dimethylsulfoxide(DMSO). The surface morphology and thermal stability of prepared composite flim was carried out by using SEM and TGA, respectively. Electrochemical and electrical conductivity of composite flim were also discussed by cyclic voltammetry and four-probe method in dry box(<27pm). And the electrode reaction mechanism was detected and analyzed from the half cell unit battery system.

  • PDF