The Experts below are selected from a list of 240 Experts worldwide ranked by ideXlab platform
Myung-jin Moon - One of the best experts on this subject based on the ideXlab platform.
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Fine Structural Analysis of Principal and Secondary Eyes in Wandering Spider, Pardosa astrigera
Applied Microscopy, 2000Co-Authors: Moon-jin Jeong, Do-seon Lim, Myung-jin MoonAbstract:The wandering spider, Pardosa astrigera, had four pairs of ocelli that arranged in three rows on the cephalothorax. Along the anterior margin lay a pair of small anterior median (AM) eye flanked on each side by anterior lateral (AL) eye. Two large posterior median (PM) eye was situated on the clypeus behind the anterior row and still more posteriorly was a pair of posterior lateral (PL) eye. The visual cell of retina consisted of cell body, rhabdome, and intermediate segment. Bipolar Neuron was found in anterior median eye (principal eye) and Unipolar Neuron in others (secondary eye). Rhabdome showed that arranged in PMeye and PLeye. But rhabdomes of AMeye and ALeye were irregular in retina. Except AMeye, incontinuous tapetum found in ALeye, PMeye, PLeye. Anterior median eye was similar to anterior lateral eye in length and posterior median eye similar to posterior lateral eye. Component size of eye were similar to 4 pairs eye in cornea. Size of lens, cell body, and rhabdome was similar not only anterior median eye and anterior lateral eye but also posterior median eye and posterior lateral eye. Vitreous body was large posterior median eye than others.
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Study on the Fine Structure of Retina of Anterior Lateral Eyes in Pardosa astrigera L. Koch (Aranea: Lycosidae)
Applied Microscopy, 1994Co-Authors: Moon-jin Jeong, Myung-jin MoonAbstract:Pardosa astrigera possessed eight eyes arranged in three rows on the frontal carapace. A pair of small anterior lateral eyes (ALE) flanked each side by an anterior median eyes (AME) lay along the anterior margin that was situated on the anterior row of clypeus. The anterior lateral eye was composed of cornea, vitreous body, and retina. Cornea was made up mainly of exocuticle lining the cuticle. Lens in anterior lateral eye was biconvex type which bulged into the cavity of the eyecup. Outer and inner central region of lens were approximately spherical with radius of curvature and , respectly. Vitreous body formed a layer between the cuticular lens and retina. They formed biconcave shape. Retina of the anterior lateral eyes was composed of three types of cells: visual cells, glia cells, and pigment cells. The visual cells were Unipolar Neuron, as were the receptor of the posterior lateral eye. But cell body was unique to the anterior lateral eyes. They were giant cell, relatively a few in number, and under the layer of vitreous bodies. Each visual cell healed rhabdomeres for a short stretch beneath the cell body. Rhabdomes were irregulary pattern in retina and electron dense pigment granules scattered between the rhabdomes. Glia cell situated at the cell body of visual cell and glia cell process reached to rhabdomere portion. Below the rhabdome, tapetum were about distance from lens, which composed of 4-5 layers. It was about length that intermediate segment of distal portion of visual cell. Electron dense pigment granules between the intermediate segment were observed.
Moon-jin Jeong - One of the best experts on this subject based on the ideXlab platform.
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Fine Structural Analysis of Principal and Secondary Eyes in Wandering Spider, Pardosa astrigera
Applied Microscopy, 2000Co-Authors: Moon-jin Jeong, Do-seon Lim, Myung-jin MoonAbstract:The wandering spider, Pardosa astrigera, had four pairs of ocelli that arranged in three rows on the cephalothorax. Along the anterior margin lay a pair of small anterior median (AM) eye flanked on each side by anterior lateral (AL) eye. Two large posterior median (PM) eye was situated on the clypeus behind the anterior row and still more posteriorly was a pair of posterior lateral (PL) eye. The visual cell of retina consisted of cell body, rhabdome, and intermediate segment. Bipolar Neuron was found in anterior median eye (principal eye) and Unipolar Neuron in others (secondary eye). Rhabdome showed that arranged in PMeye and PLeye. But rhabdomes of AMeye and ALeye were irregular in retina. Except AMeye, incontinuous tapetum found in ALeye, PMeye, PLeye. Anterior median eye was similar to anterior lateral eye in length and posterior median eye similar to posterior lateral eye. Component size of eye were similar to 4 pairs eye in cornea. Size of lens, cell body, and rhabdome was similar not only anterior median eye and anterior lateral eye but also posterior median eye and posterior lateral eye. Vitreous body was large posterior median eye than others.
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Study on the Fine Structure of Retina of Anterior Lateral Eyes in Pardosa astrigera L. Koch (Aranea: Lycosidae)
Applied Microscopy, 1994Co-Authors: Moon-jin Jeong, Myung-jin MoonAbstract:Pardosa astrigera possessed eight eyes arranged in three rows on the frontal carapace. A pair of small anterior lateral eyes (ALE) flanked each side by an anterior median eyes (AME) lay along the anterior margin that was situated on the anterior row of clypeus. The anterior lateral eye was composed of cornea, vitreous body, and retina. Cornea was made up mainly of exocuticle lining the cuticle. Lens in anterior lateral eye was biconvex type which bulged into the cavity of the eyecup. Outer and inner central region of lens were approximately spherical with radius of curvature and , respectly. Vitreous body formed a layer between the cuticular lens and retina. They formed biconcave shape. Retina of the anterior lateral eyes was composed of three types of cells: visual cells, glia cells, and pigment cells. The visual cells were Unipolar Neuron, as were the receptor of the posterior lateral eye. But cell body was unique to the anterior lateral eyes. They were giant cell, relatively a few in number, and under the layer of vitreous bodies. Each visual cell healed rhabdomeres for a short stretch beneath the cell body. Rhabdomes were irregulary pattern in retina and electron dense pigment granules scattered between the rhabdomes. Glia cell situated at the cell body of visual cell and glia cell process reached to rhabdomere portion. Below the rhabdome, tapetum were about distance from lens, which composed of 4-5 layers. It was about length that intermediate segment of distal portion of visual cell. Electron dense pigment granules between the intermediate segment were observed.
Do-seon Lim - One of the best experts on this subject based on the ideXlab platform.
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Fine Structural Analysis of Principal and Secondary Eyes in Wandering Spider, Pardosa astrigera
Applied Microscopy, 2000Co-Authors: Moon-jin Jeong, Do-seon Lim, Myung-jin MoonAbstract:The wandering spider, Pardosa astrigera, had four pairs of ocelli that arranged in three rows on the cephalothorax. Along the anterior margin lay a pair of small anterior median (AM) eye flanked on each side by anterior lateral (AL) eye. Two large posterior median (PM) eye was situated on the clypeus behind the anterior row and still more posteriorly was a pair of posterior lateral (PL) eye. The visual cell of retina consisted of cell body, rhabdome, and intermediate segment. Bipolar Neuron was found in anterior median eye (principal eye) and Unipolar Neuron in others (secondary eye). Rhabdome showed that arranged in PMeye and PLeye. But rhabdomes of AMeye and ALeye were irregular in retina. Except AMeye, incontinuous tapetum found in ALeye, PMeye, PLeye. Anterior median eye was similar to anterior lateral eye in length and posterior median eye similar to posterior lateral eye. Component size of eye were similar to 4 pairs eye in cornea. Size of lens, cell body, and rhabdome was similar not only anterior median eye and anterior lateral eye but also posterior median eye and posterior lateral eye. Vitreous body was large posterior median eye than others.
Sarah Winans Newman - One of the best experts on this subject based on the ideXlab platform.
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A developmental study of the gonadotropin-releasing hormone Neuronal system during sexual maturation in the male Djungarian hamster.
Biology of Reproduction, 1991Co-Authors: Steven M. Yellon, Sarah Winans NewmanAbstract:The number, morphology, and distribution of gonadotropin-releasing hormone cell bodies were studied in the brain of the male Djungarian hamster during sexual maturation. Males were reared in long days (1 6L: 8D) and were killed at 15, 25, or 40 days of age, before (n = 5), during (n = 4), or after puberty (n = 4), respectively. Brain sections (60 sam) from the rostral olfactory tubercle to the medial basal hypothalamus were processed for GnRJI immunocytochemistry. Unipolar and bipolar Neurons were immunolabeled for GnRH; both subtypes had smooth cell contours. Analysis of every section from the olfactory tobercie to the arcuate nucleus indicated that at all ages more than 75% of all GnRJI.immunoreactive cell bodies were distributed in the diagonal band of Broca, medial preoptic area, lateral preoptic area, and lateral hypothalamic area, GnRII-positive somata were also found in other brain regions, but in each of these areas they represented less than 6% of the total GnRH Neuron number. In peripubertal 25-day-old males, during the rapid phase of testes growth, the number of Unipolar, but not bipolar, GnRJ-I.labeled cells nearly doubled in the diagonal band of Broca compared to soma numbers in this location in prepubertal 15day-old males. The same number of Unipolar GnR}l-stained somata were found in this region in 40-day-old as in 25-day-old hamsters. In the medial preoptic area, a similar doubling of Unipolar Neuron numbers was observed at 25 days, but by 40 days the number of Unipolar immunostained GnRH cells was secondarily reduced to a level comparable to that at 15 days. Neither the number nor the distribution of bipolar immunoreactive GnRH perikarya changed from 15 to 25 days of age. However, by age 40 days, a significant increase in the bipolar subtype number was evident in the diagonal band of Broca and lateral preoptic area compared to that in 15-day-old males, GnRH Neuron numbers and subtype ratios remained unchanged in other brain regions during development. Overall, the findings indicated an increase in the number of Unipolar GnRH-stained Neurons correlated with the onset of puberty and a later increase in bipolar cells in the postpubertal hamster.
Steven M. Yellon - One of the best experts on this subject based on the ideXlab platform.
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A developmental study of the gonadotropin-releasing hormone Neuronal system during sexual maturation in the male Djungarian hamster.
Biology of Reproduction, 1991Co-Authors: Steven M. Yellon, Sarah Winans NewmanAbstract:The number, morphology, and distribution of gonadotropin-releasing hormone cell bodies were studied in the brain of the male Djungarian hamster during sexual maturation. Males were reared in long days (1 6L: 8D) and were killed at 15, 25, or 40 days of age, before (n = 5), during (n = 4), or after puberty (n = 4), respectively. Brain sections (60 sam) from the rostral olfactory tubercle to the medial basal hypothalamus were processed for GnRJI immunocytochemistry. Unipolar and bipolar Neurons were immunolabeled for GnRH; both subtypes had smooth cell contours. Analysis of every section from the olfactory tobercie to the arcuate nucleus indicated that at all ages more than 75% of all GnRJI.immunoreactive cell bodies were distributed in the diagonal band of Broca, medial preoptic area, lateral preoptic area, and lateral hypothalamic area, GnRII-positive somata were also found in other brain regions, but in each of these areas they represented less than 6% of the total GnRH Neuron number. In peripubertal 25-day-old males, during the rapid phase of testes growth, the number of Unipolar, but not bipolar, GnRJ-I.labeled cells nearly doubled in the diagonal band of Broca compared to soma numbers in this location in prepubertal 15day-old males. The same number of Unipolar GnR}l-stained somata were found in this region in 40-day-old as in 25-day-old hamsters. In the medial preoptic area, a similar doubling of Unipolar Neuron numbers was observed at 25 days, but by 40 days the number of Unipolar immunostained GnRH cells was secondarily reduced to a level comparable to that at 15 days. Neither the number nor the distribution of bipolar immunoreactive GnRH perikarya changed from 15 to 25 days of age. However, by age 40 days, a significant increase in the bipolar subtype number was evident in the diagonal band of Broca and lateral preoptic area compared to that in 15-day-old males, GnRH Neuron numbers and subtype ratios remained unchanged in other brain regions during development. Overall, the findings indicated an increase in the number of Unipolar GnRH-stained Neurons correlated with the onset of puberty and a later increase in bipolar cells in the postpubertal hamster.
