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Featured researches published by Myung-Jin Moon.


Applied Microscopy | 2013

Microstructural Organization of the Central Nervous System in the Orb-Web Spider Araneus ventricosus (Araneae: Araneidae)

Yong-Ki Park; Myung-Jin Moon

Although the geometrical difference in body position between web-building and wandering spiders could affect the organization of their central nervous system (CNS), however most of our informations about spiders CNS are dependent on those revealed from the wandering spiders. Therefore, this paper describes microstructural organizations of the CNS in the geometric orb-web spider Araneus ventricosus. Similarly to other wandering spiders, the CNS of A. ventricosus is also consisted of a dorsal supraesophageal ganglion and a ventral subesophageal mass. The supraesophageal ganglia are fused together and made up of a large sized nerve cell clusters, whereas the subesophageal ganglia are made up of the foremost part of the ventral nerve cord. It has been revealed that the only nerve arising from the supraesophageal mass was the optic nerve which connected with four pairs of eyes, whereas a pair of pedipalpal and four pairs of appendage nerves including abdominal nerve pairs were arisen from the subesophageal nerve mass. Fibrous masses are highly organized into longitudinal and transverse tracts, and are only consisted of processes of neurons and the terminal ramnifications of peripheral sensory neurons. In addition, central fibrous mass of both the brain and the subesophageal mass are totally devoid of nerve cell bodies.


Animal Cells and Systems | 2006

Antennal sensory organs in the female millipede Orthomorphella pekuensis (polydesmida: Paradoxosomatidae)

Kyung-Hwun Chung; Myung-Jin Moon

Abstract The fine structural characteristics of the antennal sensory organs of a female millipede, Orthomorphella pekuensis, were observed with field emission scanning electron microscopy. On the surface of the antenna, four basic types of sensory receptor with the function of either mechanical or olfactory reception are identified in this female millipede. Of these, chaetiform sensilla (CS) and trichoid sensilla (TS) are related to mechanical reception, and four large apical cone sensilla (AS) and three subtypes of basiconic sensilla (BS1, BS2, BS3) are likely to function in olfactory reception, as these receptors have porous structure commonly. Although this millipede also possess a number of primary or secondary sexual characters to improve the efficiency of reproduction, we could not observe their prominent sexually dimorphic characters in the antennal sensilla with the exception of minor structural and numerical differences.


Animal Cells and Systems | 2002

Fine structure of the glandular epithelium during secretory silk production in the black widow spider latrodectus mactans

Myung-Jin Moon

Among the silk glands in the black widow spider Latrodectus mactans, the ampullate one is the most predominant gland in both sexes, and is composed of three functional parts ‐ excretory duct, storage ampulla and convoluted tail regions. This experiment was performed using mechanical pulling stimulation with electric motor equipment to reveal a correlation between silk usage and silk producing system in this poisonous spider. The mature secretory products in glandular epithelium are closely packed and appear as electron‐opaque spherical vesicles. A part of the vesicles with fine fibrillar paracrystalline texture seems to store some proteins which will function at the time of final assembly into fibrils. Most of the secretory silk products which originated from the rough endoplasmic reticula of the glandular epithelial cells are grown by fusion with surrounding small vesicles. However, the Golgi complex does not seem to play an important role in this process of secretion. According to progressive maturation of secretory silk product, these granules are progressively filled with a fine fibrillar material, and thus appear much more electron‐dense than those of earlier states. When the secretory product is extruded from the glandular cavity, the epithelium is rapidly changed to a thinner layer of tall columnar cells with less definitive cell membranes. After extruding there are a few secretory droplets within these cells, thus causing this region to stain much lighter.


Applied Microscopy | 2012

Development of the Central Nervous System in the Wolf Spider Arctosa kwangreungensis (Araneae: Lycosidae)

Sung-Chan Yang; Myung-Jin Moon

The morphological and histologic differentiation of the central nervous system (CNS) in the wolf spider Arctosa kwangreungensis with respect to postembryonic development are studied using light and scanning electron microscopes. The organization of CNS which consisted of supraesophageal ganglion (SpG) and subesophageal ganglion (SbG) are established prior to the postembryo stage. The brain of first instar spiderling after a molt of the postembryo is also made up of supraesophageal ganglion and subesophageal ganglion. Although development of the optic nerve and optic lobe in SpG are not completed during the postembryoic stage, completion of whole neural system resemble to that of adult are established during the second instar stage. In particular, optic gangalion is developed from the undifferentiated cell clusters of the SpG, moreover four pairs of appendage ganglia and another pairs of abdominal ganglia are produced from the SbG. Nerve cells of the most developing stages are composed of typical monopolar neur1ons, and total three types of neurons can be identified through the histological and morphological basis of present study. These cell clusters are differentiated into neurons and grow dendritic fibers according to further development of the CNS.


Applied Microscopy | 2012

Histologic and Microstructural Analyses on Postembryonic Development in the Wolf Spider Arctosa kwangreungensis (Araneae: Lycosidae)

Sung-Chan Yang; Myung-Jin Moon

Histologic and microstructural changes during the postembryonic development of the wolf spider Arctosa kwangreungensis were studied using light and scanning electron microscopy to examine the relationship between a morphological differentiation and behavioral properties. The postembryo with abdominal yolk sac was stayed inactive in the egg case because its muscular and visual systems were not fully developed to a functional level. The first instar spiderlings, developed from the postembryo by a first molting process, started to exhibit its pigmentation on their body cuticles. In particular, undifferentiated cell clusters of central nervous system (CNS) were densely distributed within the cephalothorax, and highly differentiated abdominal ganglion was observed. They had a characteristic visual system looks more like its adult counterpart, and had segmented appendages looks more like the tiny spiders containing well oriented muscular system. After 3rd instar, spiderlings grew more rapidly with accordance to their consistent growth and periodical molting processes. Thus, the relative area of CNS with respect to cephalothorax was gradually decreased, instead a pair of venom glands, musculature, and connectives occupied the residual area. It has been revealed that the early development of spider can be controled by the feeding condition of larval period, since histologic and microstructural differentiations in both appendages and optic system were completed at the second instar. In particular, behavioral properties of the wandering spiders that depend on vision and their running ability were deeply related to physiological differentiation of the microstructural development.


Animal Cells and Systems | 1998

Fine structure of the ampullate silk glands in the wolf spider, pardosa astrigera (araneae: Lycosidae)

Myung-Jin Moon

Though the wandering spiders do not produce webs for prey‐catching, they have silk producing apparatus. Among the four kinds of silk glands in the wolf spider, Pardosa astrigera, the ampullate one is the most predominant gland in both sexes, and is composed of three functional parts; excretory duct, storage ampulla and convoluted tail regions. The duct is basically composed of three superposed types of layers which are inner cuticles, monolayered epithelial cells and peripheral connective cells. The electron lucent subcuticles which have the functions of water removal and orientation of silk fibers during polymerization are well developed at the anterior region near the spinneret. Whereas the endocuticles which contain two types of banding patterns at the cross section are developed at the rest of the duct region. The secretory silks are synthesized within the glandular epithelial cells of the tail as secretory granules, and then released to the inner cavity of the storage ampulla by the mechanism of apoc...


Animal Cells and Systems | 2008

Spinning apparatus for the dragline silk in the funnel‐web spider Agelena Limbata (Araneae: Agelenidae)

Jong-Gu Park; Myung-Jin Moon

Abstract Among the four kinds of silk glands in the funnel‐web spider Agelena limbata, the ampullate gland for dragline silk production is the most predominate one in both sexes, and is composed of three functional parts ‐excretory duct, storage ampulla and convoluted tail regions. Two pairs of major ampullate glands send secretory ductules to the anterior spinnerets, and another two pairs of minor ampullate glands supply the middle spinnerets. There are no apparent differences between the major and minor ampullate glands not only the external spigots but also their internal silk glands. However, the microstructure is very unique in this spider, because each gland has spherical shaped storage sac with twig‐like branched tails. Nevertheless, the wall of the secretory region is similarly composed of a single layer of epithelial cells. The mature secretory silks in glandular epithelium are closely packed and accumulated as electron‐opaque vesicles. Most of the secretory products which originated from the rough endoplasmic reticula (rER) are grown up by fusion with the surrounding small vesicles however, the Golgi complex does not seem to play an important role in this process of secretion.


Applied Microscopy | 1996

Fine Structural Aspects of the Venom Production in the Black Widow Spider, Latrodectus mactans

Myung-Jin Moon


Applied Microscopy | 2007

Microstructure of the Antennal Sensory Organs in the Millipede Cawjeekelia pyongana (Polydesmida: Paradoxomatidae)

Kyung-Hwun Chung; Myung-Jin Moon


Applied Microscopy | 2009

Microstructure of the Antennal Sensilla in the Millipede Anaulaciulus koreanus koreanus (Julida: julidae)

Kyung-Hwun Chung; Myung-Jin Moon

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Kyung-Hwun Chung

Gwangju Institute of Science and Technology

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