• 제목/요약/키워드: Micromorphology

검색결과 56건 처리시간 0.023초

3D Micromorphology Producing within Poly(lactic acid) Skeleton Using Room-Temperature Ionic Liquids: From Particulate, Fibrous or Porous Scaffolds to Beads

  • Shin, Ueon-Sang;Kim, Jong-Gyu
    • Bulletin of the Korean Chemical Society
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    • 제33권7호
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    • pp.2295-2298
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    • 2012
  • We describe herein a three-dimensionally diverse micropatterning of poly(lactic acid), as a biopolymer, using 1-butyl-3-methylimidazolium-based room-temperature ionic liquids (bmim-based RTILs), [bmim]X (X = $SbF_6$, $PF_6$, $NTf_2$, Cl). Utilizing the hydrophobic bmim-based RTILs, [bmim]X (X = $SbF_6$, $PF_6$, $NTf_2$) and a phase separation technique, we were able to produce white and opaque membranes with a three-dimensional structure closely packed with particles ($10-50{\mu}m$ in diameter). The particlulate structure, made by the assistance of [bmim]$NTf_2$ and DCM, interestingly transformed to a fibrous structure by using a cosolvent, e.g., DCM/$CF_3CH_2OH$. When we used an increased amount of [bmim]$NTf_2$, the particles were effectively detached and macrosized ($100-500{\mu}m$ in diameter) and the oval-shaped beads were obtained in a powder form. By varying the counter-anion type of the imidazolium-based RTIL, for example from $NTf_2^-$ to $Cl^-$, the particulate 3D-morphology was once more transformed to a porous structure. These reserch results could be potentially useful, as a method to fabricate particulate scaffolds, fibrous or porous scaffolds, and beads as a biopolymer device in diverse fields including drug delivery, tissue regeneration, and biomedical engineering.

참나무속(Quercus L.) 식물 잎의 큐티클 미세형태의 분류학적 의미 (Cuticle micromorphology of leaves of Quercus L. (Fagaceae) and its taxonomic implications)

  • 조성호;김기중;박종욱;선병윤;정명기;박재홍
    • 식물분류학회지
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    • 제38권4호
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    • pp.405-431
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    • 2008
  • 참나무속의 22종과 외군의 큐티클 미세형질을 주사전자현미경(SEM)을 통해 분석하였다. 22종은 참나무속의 모든 절에서 각각 2-3종을 선정하였고, 외군은 Trigonobalanus 속과 Alnus 속에서 선정하였다. 10개의 큐티클 내부형질과 8개의 큐티클 외부형질을 관찰, 기재하였다. 돌기물의 유무, 배축면 수층벽의 형태, 부세포의 배열 형태 및 수층벽의 형태, 왁스층의 발달 정도가 속내 분류에 유용한 형질로 나타났다. 18개의 형질을 이용한 분지분석에서는 66 step의 tree length를 가지는 72개의 최대절약계통수를 얻었다. 분지분석결과 Cyclobalanopsis 아속과 Quercus 아속은 각각 75% bootstrap value와 57% bootstrap value로 지지되었다. 큐티클 미세형질에 기초한 참나무속의 분류에서는 Camus가 제안한 아속간의 분류체계를 지지하였다. 그러나 Erythrobalanus 절과 Cerris 절이 하나의 그룹을 형성하였고, Lepidobalanus 절이 다분지를 형성하여 절간 유연관계는 알 수 없었다. 그러므로 참나무속의 절간 분류를 위해서는 보다 다양한 연구가 수행되어야 할 것으로 판단된다.

Micromorphology of Benthic Diatom Species Achnanthes alteragracillima Lange-Bert

  • Lee, Jung Ho
    • Journal of Plant Biology
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    • 제37권4호
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    • pp.417-420
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    • 1994
  • Morphology of Achnanthes alteragracillima Lange-Bert. was studied with scanning electron microscopy in epilithic samples from the Kwang River (Kwangchun), Kyungsangbuk-Do, Korea. The species was characterized by the external raphe terminal fissure deflecting up to valve margin, the internal raphe proximal endings slightly deflecting to the opposite direction each other and biased hyaline area at the valve pole. It could be distinguished from A. minutissima K tz., closely related species, in having not straight external raphe terminal fissures, and from A. convergens H.Kob. in having a biased hyaline area at the valve pole and not a convergent striae arrangement at the pole of the raphe valve.

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쉬땅나무족(장미과) 화판표피의 미세형태학적 특성에 관한 연구 (A Study on the Petal Micromorphological Characteristics of the Tribe Sorbarieae (Rosaceae))

  • 송준호;홍석표
    • 한국자원식물학회지
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    • 제29권4호
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    • pp.376-384
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    • 2016
  • 쉬땅나무족 15분류군의 화판의 미세형태학적 형질을 주사 전자현미경으로 관찰하여 화판 향축면, 배축면의 세포 외형, 배열, 수층벽, 큐티클의 미세형태를 자세히 기재하였으며, 분류학적, 계통학적 유용성을 검토하였다. 쉬땅나무족의 화판은 유두상 또는 원추형 유두상(PCS), 직사각형의 주름판상(TRS)로 확인되었으며, 향축면, 배축면의 화판 구조에 따라 크게 세 유형으로 구분하였다. Type I. PCS-TRS, Type II. PCS-PCS, Type III. TRS-TRS (향축면-배축면). 구분된 이들 유형과 수층벽, 큐티클 표면의 형태는 족 내 속간/종간 진단 형질로 유용하였을 뿐 아니라, 계통학적으로도 그 유용성이 확인되었다. 또한, 화판 표면의 세포의 미세형태와 수분매개자(곤충을 통한 충매)와의 연관성을 나타내는 추가적인 사례로 제시하였다.

Effects of Road Constructions on Soil Drainage from Paddy Fields

  • Sonn, Yeon-Kyu;Moon, Yong-Hee;Zhang, Yong-Seon;Jung, Kang-Ho;Cho, Hye-Rae;Hyun, Byung-Keun;Shin, Kook-Sik;Han, Kyeong-Hwa
    • 한국토양비료학회지
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    • 제48권3호
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    • pp.189-193
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    • 2015
  • Bad drainage problems from paddy fields adjacent to roads are caused by higher constructed roads which change topography of paddy fields to concave topography and artificial pan to prevent road erosion when road constructions are occurred. This study investigated effects of topography changes on soils by road constructions. Soil samples were investigated by physico-chemical analyses and micromorphology analyses from representative soil profile of Sachon series and soil samples. The characteristics of Sachon series that were adjacent to roads were fewer redoximorphic features (RMF) and increase in grey layers than the original Sachon series. The characteristics of Yecheon Series were shown from Jeollanamdo - Suncheon > Chungchungnamdo - Cheonan > Gangwondo - Wonju. Mosaic speckles were shown from micromorphological analyses because of repeat of shrink and expansion by wetting and drying. The location of graying in soil clods were found from coarse stone blocks to fine stone blocks and color changes of composed particles were also found.

한국산(韓國産) 참나무과(科) 수종(樹種) 도관구조(道管構造)에 관(關)한 연구(硏究)(II) -도관벽(導管壁)의 수식구조(修飾構造)- (A Study on the Vessel Structure of Fagaceae Species in Korea (II) -Micromorphology of Vessel Wall Sculpture-)

  • 이성재;이원용
    • Journal of Forest and Environmental Science
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    • 제8권1호
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    • pp.51-66
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    • 1992
  • This study was carried out to investigate the micromorphology of vessel wall sculpture such as shape of perforation plate, perforation rim, steepness of perforation plate, occurrence of vestured pit, warty layer and ray-vessel pitting on 13 species of Fagaceae in Korea. The results were summarized as follows ; 1. In the species examined, all sample species except Fagus crenata var. multinervis have simple perforation plate. But Fagus crenata var. multinervis has simple and scalariform perforation plate (it was called to combination perforation plate) in a tree stem. 2. The shapes of perforation rim could be classified into five types; Type A without tail, Type B with small tail on both sides, Type C with long tail on both sides, Type D with tail only one side and Type E with the very short interval between perforations. Among five types, Type Band C have higer frequency of distribution than the others. 3. The steepness of perforation plate measured was about 20 degree on pore zone and 43 degree on outside parts of pore zone. 4. Species with vestured pit were Q. aliena, Q, dentata, Q. variabilis, Fagus crenata var. multinervis, Castanopsis cuspidata var sieboldii, Q. acuta, Q. stenophylla, and Q. glauca. But the extent of vesturing was very slight and vestured pits were observed mainly in ray-vessel pit of some vessel elements. 5. Species with warty layer on the inner surface wall of all vessel elements were Q. acuta, Q. stenophylla, Q. glauca, Fagus crenata var. multinervis and species with warty layer of some vessel elements were Q. aliena, Q, dentata, Q. variabilis, Castanopsis cuspidata var. sieboldii. 6. Species with palisade ray-vessel pit were Q. acuta, Q. stenophylla, Q. glauca, Castanea crenata, Castanea bungeana, Q. aliena, Q. serrata, Q. mongolica, and species with scalariform ray-vessel pit was Fagus crenata var. multinervis and species with oval ray-vessel pit were Q, dentata, Castanopsis cuspidata var sieboldii.

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