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강희웅,전제천,이기영,박관하,최기호 한국통합생물학회 2010 Animal cells and systems Vol.14 No.4
Ultrastructural studies of vitellogenesis in oocytes and follicle cells during oogenesis in female Protothaca (Notochione) jedoensis were investigated by histological and transmission electron microscope observations. In early vitellogenic oocytes, combined activities of the Golgi complex, mitochondria and rough endoplasmic reticulum in the cytoplasm are associated with autosynthetic vitellogenesis. Furthermore, at this time, many coated vesicles at the basal region of the oolemma of the oocyte lead to the formation of vesicles through endocytosis in the cytoplasm. Through the formation of the coated pits on oolemma during vitellogenesis, the uptake of extrafollicular precursors (nutritive materials) occurs in coated vesicles by endocytosis. Therefore, it is assumed that these exogenous materials are involved in heterosynthetic vitellogenesis. During late oogenesis, exogenous yolk precursors (yolk granules), lipid droplets and proteinaceous yolk granules are present in the cytoplasm of late vitellogenic oocytes. In mature oocytes,small yolk granules appear intermingled and form large mature yolk granules. Thus, two processes of vitellogenesis occur in oocytes by way of endogenous autosynthesis and exogenous heterosynthesis. The follicle cells attached to the oocytes appear to play an integral role in vitellogenesis in this study.
강희웅,조재관,손맹현,박종연,홍창기,Jae Seung Chung,정애영 한국발생생물학회 2015 발생과 생식 Vol.19 No.1
The gonadosomatic index (GSI), gonadal development and changes in hormones in plasma level of the indoor cultured grunt (Hapalogenys nitens) were investigated by histological study from August 2011 to October 2012. The GSI showed similar trends with gonad developmental stages during the culture periods. Changes in plasma level of estradiol-17β of female H. nitens reached the highest value before the spawning period, and seasonal changes in plasma level of estradiol-17β were similar in trends of oocyte developments and GSI changes. Testosterone levels of male H. nitens reached the highest value before and after the spent stage. Ovarian developmental stages of H. nitens could be classified into early growing stage, late growing stage, mature stage, ripe and spawning stage, recovery and resting stage. The testicular developmental stages could be divided into growing stage, mature stage, ripe and spent stage, and recovery and resting stage.
강희웅,정의영,정재승,이기영 한국통합생물학회 2013 Animal cells and systems Vol.17 No.4
Ultrastructural studies of spermatogenesis and the functions of Leydig cells and Sertoli cells were investigated by electron microscope observation. Ultrastructural characteristics of spermatozoa of Larimichthys polyactis (Sciaenidae) have a round head, a nucleus containing highly compact filamentous clusters of chromatin, slightly eccentric nuclear fossa, no acrosome, a short midpiece with a short cytoplasmic channel, and a flagellum showing the classic axoneme structure (92) and short irregular flagellum lateral fins. The spermatozoon of this species (Sciaenidae) is Perciformes type II: the flagellar axis is parallel to the nucleus, the centriolar complex is outside the nuclear fossa, the proximal centriole is anterior and perpendicular to the distal centriole, and no more than five spherical mitochondria are observed. Each of the well-developed Leydig cells observed during the periods of active meiotic division and before spermiation contains an ovoid vesicular nucleus; a number of smooth endoplasmic reticulum, tubular, or vesicular mitochondrial cristae; and several lipid droplets within the cytoplasm. This indicates that Leydig cells, as typical steroidogenic cells showing several cytoplasmic characteristics, are involved in male steroidogenesis. However, no clear evidence of steroidogenesis or of any transfer of nutrients from the cells to spermatids that appears to be associated with phagocytic function in the seminiferous lobule was observed for Sertoli cells. These findings indicate that Sertoli cells of this species function in phagocytosis and the resorption of products originating from degenerating spermatids and spermatozoa following spermiation.
서식지와 양식방법에 따른 큰가리비 (Patinopecten yessoensis) 의 영양성분 비교분석
강희웅,최진,송재희,정희도 한국패류학회 2019 The Korean Journal of Malacology Vol.35 No.2
This study compared that the nutrient composition of two domestic commercial Yesso scallop (Korea: Gangneung hanging culture, Pohang sowing culture) and one imported commercial Yesso scallop (Japan: Hokkaido sowing culture), which are distributed on the east coast of Korea, for increasing their value and efficient utilization. The crude lipid content of carcass was 0.11-0.32%, the lowest among the proximate composition. A total of 18 amino acids were identified, the glutamic acid was the highest content of 13.9-14.6% of the total amino acids. A total 27 free amino acids were identified, free glycine content was highest at 34.3-42.9% of the total free amino acids. Eicosapentaenoic acid (EPA, C20:5n-3) and docosapentaenoic acid (DHA, C22:6n-3) content of Gangneung hanging culture scallop were highest at 326.2 ± 38.04 mg/100 g and 195.7 ± 23.10 mg/100 g in total fatty acids of scallops, respectively. Vitamin B2, niacin, sodium, potassium and magnesium content were significantly affected by habitats. Based on these results, each nutrients composition was affected by habitats and culture method. However, all Yesso scallop used for analysis were low fat seafoods and considered to be high-quality food rich in EPA and DHA.