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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal DOI :
Korean Society of Electron Microscopy
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Volume 41, Issue 4 - Dec 2011
Volume 41, Issue 3 - Sep 2011
Volume 41, Issue 2 - Jun 2011
Volume 41, Issue 1 - Mar 2011
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Serial Block-Face Imaging by Field Emission Scanning Electron Microscopy
Kim, Ki-Woo ;
Applied Microscopy, volume 41, issue 3, 2011, Pages 147~154
Backscattered electrons (BSE) are generated at the impact of the primary electron beam on the specimen. BSE imaging provides the compositional contrast to resolve chemical features of sectioned block-face. A focused ion beam (FIB) column can be combined with a field emission scanning electron microscope (FESEM) to ensure a dual (or cross)-beam system (FIB-FESEM). Due to the milling of the specimen material by 10 to 100 nm with the gallium ion beam, FIB-FESEM allows the serial block-face (SBF) imaging of plastic-embedded specimens with high z-axis resolution. After contrast inversion, BSE images are similar to transmitted electron images by transmission electron microscopy. As another means of SBF imaging, a specialized ultramirotome has been incorporated into the specimen chamber of FESEM (
). Internal structures of plastic-embedded specimens can be serially revealed and analyzed by
with a large field of view to facilitate three-dimensional reconstruction. These two SBF approaches by FESEM can be employed to unravel spatial association of (sub)cellular entities for a comprehensive understanding of complex biological systems.
The Oogenesis of Three Spot Gourami, Belontiidae, Teleostei
Chang, Byung-Soo ; Jung, Han-Suk ; Joo, Kyung-Bok ; Kim, Dong-Heui ;
Applied Microscopy, volume 41, issue 3, 2011, Pages 155~161
Three spot gourami (Trichogaster trichopterus Pallas, 1770) is a teleost belonging to Belontiidae. The oogenesis of three spot gourami was investigated by light microscope. The ovary was of light peach color and ellipsoidal shape with the major axis 2 cm and the minor axis 1 cm. Cytoplasm of oogonia was basophilic and many nucleoli were located at inside of nuclear membrane. In primary oocyte, lipid droplets were distributed only in the marginal area first, than at nuclear envelope near. In secondary oocyte, the egg envelope was formed and yolk vesicles was formed in the marginal area. The basophilic substance of cytoplasm was changed to acidic. In case of matured egg, thickness of egg envelope and size of egg were increased. The yolk vesicles were changed to yolk mass in accordance with development. The fertilized eggs were the colorless, transparent, spherical, adhesive and pelagic type. A large oil droplet was located in vitelline membrane of the fertilized egg. In conclusion, the oogenesis of three spot gourami was characterized by the increase in cell size, the formations of lipid droplets and yolk, the decrease of basophilic substance in the cytoplasm, and formation of one large oil droplets.
The Oogenesis of Tiger Barb, Cyprinidae, Teleostei
Jung, Han-Suk ; Joo, Kyung-Bok ; Kim, Dong-Heui ;
Applied Microscopy, volume 41, issue 3, 2011, Pages 163~168
Tiger barb (Puntius tetrazona Bleeker, 1855) is a teleost belonging to Cyprinidae. The oogenesis of tiger barb was investigated by light microscope. The ovary was of white and ellipsoidal shape with the major axis 2 cm and the minor axis 1 cm. Cytoplasm of oogonia was basophilic and many nucleoli were located at inside of nuclear membrane. In early stage of primary oocyte, yolk vesicles were distributed only in the marginal area. In secondary oocyte, the egg envelope was formed and yolk vesicles was formed in the cytoplasm. The basophilic substance of cytoplasm was changed to acidic. In case of matured egg, thickness of egg envelope and size of egg were increased. The yolk vesicles were changed to yolk mass in accordance with development. Also, there is not the formation of oil droplets in cytoplasm. In conclusion, the oogenesis of tiger barb was characterized by the increase in cell size, the formation of yolk, the decrease of basophilic substance in the cytoplasm, and formation of yolk mass.
Inhibitory Efficacy of Black Tea Water Extract on Melanogenesis in Melan-a Cells and Its Action Mechanisms
Choi, So-Young ; Kim, Young-Chul ; Chang, Byung-Soo ;
Applied Microscopy, volume 41, issue 3, 2011, Pages 169~177
To evaluate the whitening effect of Camellia sinensis water extract (CSWE), CSWE was treated to melan-a cells. Total polyphenol contents and flavonoid contents of CSWE were 102 mg/g and 87 mg/g, respectively. The electron-donating ability of CSWE revealed a dose-dependent response, showing the excellent ability of 82% at 800
/mL, and which was higher than the arbutin (48%). The CSWE significantly (p<0.001) suppressed the melanin synthesis and the development of melanocyte dendrites was inhibited in a dose-dependent manner. The CSWE significantly (p<0.001) inhibited both intra-cellular and cell-extracted tyrosinase activities. And inhibitory efficacies of CSWE on both melanin synthesis and tyrosinase activity were significantly (p<0.001) higher than the arbutin. The tyrosinase protein expression was not influenced by arbutin treatment. However, CSWE treatment significantly (p<0.001) reduced it. Both arbutin and CSWE treatment did not influence on mRNA expressions of tyrosinase, tyrosinase-related protein-1 and tyrosinase related protein-2.
Comparative Ultrastructure on Spermatogenesis of Diploidand and Triploid in Mud Loach, Misgurnus mizolepis
Kim, Bong-Seok ; Kim, Jae-Won ;
Applied Microscopy, volume 41, issue 3, 2011, Pages 179~188
Ultrahistology of spermatogenic cells on spermatogenesis were analyzed from triploid males of the mud loach, Misgurnus mizolepis. All the testis of triploid males were smaller in thickness and shorter in length than those of diploid males, but the testes developmental stages in triploid males were very similar to those of diploid males. And cytological characteristics were also almost identical to each other. Also Sertoli cells with high activity were recognized at intralobuli of the testis in triploid males during the period of spermiogenesis. And then a few matured spermatozoa were observed in testis of triploid, and interstitial cells also appeared high active in interlobuli. But nucleus sizes of spermatogenic cells of triploid male according to developmental stages were larger than those of diploid overall. Especially, spermatozoa of triploid showed abnormal morphology such as two or more tail flagella, significantly larger head sizes, nucleus size, and diameter of axial filaments etc. than those from diploid.
Structure of Egg Envelope and Oogenesis of Kichulchoia multifasciata (Pisces, Cobitidae)
Kim, Chi-Hong ; Kim, Jae-Goo ; Park, Jong-Young ;
Applied Microscopy, volume 41, issue 3, 2011, Pages 189~196
Histological study on egg envelope and oogenesis of Kichulchoia multifasciata (Pisces, Cobitidae) was carried out by light microscopes and scanning electron microscopes. Various developmental cells appeared in ovary of the specimen catched during November 2010. The cytoplasm of oogonia was acidic and many nucleoli were located at the inner side of nucleus membrane. The size of the oogonia was
with nucleus size
. Primary oocyte having
in diameter began to accumulate yolk vesicles. As the developmental stages proceed, secondary oocyte grows larger to
, and eosinophilic yolk granules yolk granules appeared between the yolk vesicles occupying most cytoplasm, and there are some yolk mass formed already. There are some yolk mass formed already. Envelope of fertilized egg investigated by a scanning electron microscope had plenty of microvilli (2~3
in length) over the entire egg surface and a micropyle. Especially, the microvilli surrounding the micropyle were longer than those of egg surface with
The Alleviative Effect of White Tea Water Extract on Inflammation and Skin Barrier Damage
Lee, Kyung-Ok ; Kim, Young-Chul ; Chang, Byung-Soo ;
Applied Microscopy, volume 41, issue 3, 2011, Pages 197~204
To investigate the alleviative effect of white tea water extract on the inflammation and skin barrier damage, skin aging animal model was produced by the irradiation of UVB to the backs of hairless mice for 12 weeks. And then experimental materials were applied topically for 4 weeks. At the 28th day of experiment, positive control (PC, 0.01% retinoic acid treatment) and experimental groups (E1, 1% white tea water extract treatment; E2, 2% white tea water extract treatment) had significantly (p<0.001) lower values of both skin erythema index and transepidermal water loss (TEWL) than the control (C, saline treatment) group. The appearance of mast cell and the degree of its degranulation in dermal and subcutaneous layers were remarkably reduced in E1 and E2 groups compared to the C group. It is found that white tea water extract is effective in skin barrier damage and inflammation in hairless mouse.
Morphological Comparison Hysterothylacium sp. and Anisakis simplex (Nematoda: Anisakidae) from Wild Black Rockfish, Sebastes schlegeli, and Histopathological Host Reaction
Park, Jung-Jun ; Park, Myoung-Ae ; Choi, Hye-Sung ; Kim, Seok-Ryel ;
Applied Microscopy, volume 41, issue 3, 2011, Pages 205~213
Numerous anisakids were parasitic near the digestive tract of the black rockfish, Sebastes schlegeli and some anisakids observed on the liver of the host. Anisakids in the host were identified three species (Hysterothylacium sp., Anisakis simplex, A. pegreffii) and Hysterothylacium sp. was the high occurrence of anisakid worms in the host. Hysterothylacium sp. was shorter and thinner than A. simplex. Both of anisakids observed lip, mouth, nerve ring, excretory pore and excretory duct in the anterior portion. In the mid portion, anisakids had esophagus, ventriculus and intestine and especially, Hysterothylacium sp. had intestinal ceacum and ventricular appendage. There was conical nodulose apex at the end of the posterior portion in Hysterothylacium sp. and spine in A. simplex. SEM examination revealed that there was three lip near the mouth of Hysterothylacium sp. Dorsal lip was approximately 65
and paried lateroventral lip were approximately 60
in the width. All lips were found double papilla (approximately 8
in the width). The body width of the Hysterothylacium sp. and A. simplex was approximately 480
respectively. The hight of the lateral alae was about 7
and width of papilla on the cornical nodulose apex was about 3.3
in Hysterothylacium sp. The hight of spine was approximately 20
in A. simplex. There was mainly Hysterothylacium sp. in the intestinal lumen of the host. The nematod worms were parasitic near the mucosal fold and in the submucosal. In the mucosal epidermal layer, it was increased mucous cells by the infection of the parasites.
Image Processing of Defocus Series TEM Images for Extracting Reliable Phase Information
Song, Kyung ; Shin, Ga-Young ; Kim, Jong-Kyu ; Oh, Sang-Ho ;
Applied Microscopy, volume 41, issue 3, 2011, Pages 215~222
We discuss the experimental procedure for extracting reliable phase information from a defocus series of transmission electron microscopy (TEM) dark-field images using the transport of intensity equation (TIE). Taking InGaN/GaN multi-quantum well light-emitting diode as a model system, various factors affecting the final result of reconstructed phase such as TEM sample preparation, TEM imaging condition, image alignment, the correction of defocus values and the use of high frequency pass filter are evaluated. The obtained phase of wave function was converted to the geometric phase of the corresponding lattice planes, which was then used for the two-dimensional mapping of lattice strain following the dark-field inline holography (DIH) routine. The strain map obtained by DIH after optimized image processing is compared with that obtained by the geometric phase analysis of high resolution TEM (HRTEM) image, manifesting that DIH yields more accurate and reliable strain information than HRTEM-based GPA.