Korean journal of biological sciences最新文献_第6页

First zoea of Pagurus japonicus (Crustacea: Decapoda: Anomura: Paguridae) reared in the laboratory 实验室饲养的日本野田鸡(甲壳纲:十足目:反常目:野田鸡科)第一虫群

Korean journal of biological sciences Pub Date : 2003-01-01 DOI: 10.1080/12265071.2003.9647676

H. Ko, Hoi-Jeong Yang

引用次数: 5

Two new sponge species of the genus Stelletta (Astrophorida: Ancorinidae) from Korea 标题韩国海绵体属二新种(海绵体目:海绵体科)

Korean journal of biological sciences Pub Date : 2003-01-01 DOI: 10.1080/12265071.2003.9647678

C. Sim, Young A. Kim

引用次数: 2

Fine structural analysis of the cocoon silk production in the garden spider, Argiope aurantia 园蛛产茧丝的精细结构分析

Korean journal of biological sciences Pub Date : 2003-01-01 DOI: 10.1080/12265071.2003.9647680

M. Moon

{"title":"Fine structural analysis of the cocoon silk production in the garden spider, Argiope aurantia","authors":"M. Moon","doi":"10.1080/12265071.2003.9647680","DOIUrl":"https://doi.org/10.1080/12265071.2003.9647680","url":null,"abstract":"The principal fibers used in constructing the cocoon in the garden spider, Argiope aurantia, are large‐diameter fibers developed from tubuliform glands and small‐diameter fibers presumed to be spun by the aciniform silk glands. Scanning electron micrographs of the large‐diameter fibers on both surfaces of the cocoon clearly reveal their fine structural differences. While the silk fibers on the inner surface have smooth and homogeneous appearances, each fiber on the outer surface represents a multicomponent internal structure. Examination of each fibers using transmission electron microscope also provides additional evidence that the multicomponent fibers contain numerous electron lucent fibrils embedded in an amorphous electron dense matrix. It has been also revealed that two types of secretory granules presumed to be the precursors of tubuliform fibers are closely related to the production of distinct coloration in luminal contents ‐ brownish and yellowish components. Moreover, these electron‐dense granules, possibly precursor of fibrillar component, and electron‐lucent granules, possibly precursor of matrix component, are densely packed and remain close to each other without fusion. It is critical evidence that the individual tubuliform fiber is not only heterogeneous and multicomponent but also takes place in a variety at manners throughout the length of the gland.","PeriodicalId":85060,"journal":{"name":"Korean journal of biological sciences","volume":"7 1","pages":"35 - 41"},"PeriodicalIF":0.0,"publicationDate":"2003-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/12265071.2003.9647680","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"59655544","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 15

Nutrient leaching from leaf litter of emergent macrophyte (Zizania latifolia) and the effects of water temperature on the leaching process 苗生植物紫穗槐凋落叶的养分淋失及水温对淋失过程的影响

Korean journal of biological sciences Pub Date : 2003-01-01 DOI: 10.1080/12265071.2003.9647718

Sangkyu Park, Kang-Hyun Cho

{"title":"Nutrient leaching from leaf litter of emergent macrophyte (Zizania latifolia) and the effects of water temperature on the leaching process","authors":"Sangkyu Park, Kang-Hyun Cho","doi":"10.1080/12265071.2003.9647718","DOIUrl":"https://doi.org/10.1080/12265071.2003.9647718","url":null,"abstract":"To quantify nutrient loading from emergent macrophytes through leaching in the littoral zones of Paldang Reservoir, we conducted incubation experiments using leaf litter of the emergent macrophyte, Zizania latifolia. To separate the leaching process from microbial decay, we used HgCl2 to suppress microbial activity during the experiment. We measured electric conductivity, absorbance at 280 nm, total nitrogen and dissolved inorganic nitrogen, total phosphorus and soluble reactive phosphorus, Na, K, Mg and Ca amounts in leaf litter and in water. In addition, we examined the effects of water temperature and ion concentrations of ambient water on the leaching process. A total of 6% of the initial ash‐ free dry mass of leaf litter was lost due to leaching during incubation (four days). Electric conductivity and A280 continued to increase and saturate during the incubation. To compare reaching rates of different nutrients, we fitted leaching dynamics with a hyperbolic saturation function [Y=A•X/(B+X)]. From these fittings, we found that ratios of leaching amounts to nutrient concentration in the litter were in the order of K>Na>Mg>P>Ca>N. Leaching from leaf litter of Z. latifolia was dependent on water temperature while it was not related with ion concentrations in the ambient water. Our results suggest that the leaching process of nutrients, especially phosphorus, from aquatic macrophytes provides considerable contribution to the eutrophication of the Paldang Reservoir ecosystem.","PeriodicalId":85060,"journal":{"name":"Korean journal of biological sciences","volume":"7 1","pages":"289 - 294"},"PeriodicalIF":0.0,"publicationDate":"2003-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/12265071.2003.9647718","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"59655633","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 52

Formation of sensory pigment cells requires fibroblast growth factor signaling during ascidian embryonic development 在海鞘胚胎发育过程中，感觉色素细胞的形成需要成纤维细胞生长因子信号

Korean journal of biological sciences Pub Date : 2003-01-01 DOI: 10.1080/12265071.2003.9647708

G. Kim

{"title":"Formation of sensory pigment cells requires fibroblast growth factor signaling during ascidian embryonic development","authors":"G. Kim","doi":"10.1080/12265071.2003.9647708","DOIUrl":"https://doi.org/10.1080/12265071.2003.9647708","url":null,"abstract":"The tadpole larva of the ascidian Halocynthia roretzi has two sensory pigment cells in its brain vesicle. To elucidate the temporal requirement for FGF signaling in formation of the pigment cells, embryos were treated with an FGF receptor 1 inhibitor, SU5402, or an MEK inhibitor, U0126 during various embryonic stages. In the present study, it is shown that the embryos treated with SU5402 from the 16‐cell stage to the early gastrula stage do not form pigment cells, whereas those treated after the early gastrula stage form pigment cells. In pigment cell formation, embryos suddenly exhibited the sensitivity to SU5402 only for 1 h at the neural plate stage (∼4 h after the beginning of gastrulation). When U0126 treatment was carried out at various stages between the 8‐cell and late neurula stages, the embryos scarcely formed pigment cells. Pigment cell formation occurred when the embryos were placed in U0126 at early tailbud stage. These results indicate that FGF signaling is involved in pigment cell formation at two separate processes during ascidian embryogenesis, whereas more prolonged period is required for MEK signaling.","PeriodicalId":85060,"journal":{"name":"Korean journal of biological sciences","volume":"7 1","pages":"221 - 225"},"PeriodicalIF":0.0,"publicationDate":"2003-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/12265071.2003.9647708","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"59655788","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Association study between vitamin D receptor gene polymorphism and adult periodontitis in Korean 维生素D受体基因多态性与韩国成人牙周炎的相关性研究

Korean journal of biological sciences Pub Date : 2003-01-01 DOI: 10.1080/12265071.2003.9647697

B. Kang, N. Ha

引用次数: 1

Salicylic acid and wounding induce defense‐related proteins in Chinese cabbage 水杨酸和伤害诱导大白菜防御相关蛋白

Korean journal of biological sciences Pub Date : 2003-01-01 DOI: 10.1080/12265071.2003.9647707

Hong Nam Kim, J. Cha, T. Cho, Hak Yong Kim

{"title":"Salicylic acid and wounding induce defense‐related proteins in Chinese cabbage","authors":"Hong Nam Kim, J. Cha, T. Cho, Hak Yong Kim","doi":"10.1080/12265071.2003.9647707","DOIUrl":"https://doi.org/10.1080/12265071.2003.9647707","url":null,"abstract":"The response of plants to pathogens and wounding is dependent upon very sensitive perception mechanisms. Although genetic approaches have revealed a variety of resistance genes that activate common defense responses, defense‐related proteins are not well characterized in plants. Therefore, we used a proteomic approach to determine which defense‐related proteins are induced by salicylic acid (SA) and wounding in Chinese cabbage. We found that SA and wounding induce pathogenesis‐related protein 1a (PR1a) at both protein and mRNA levels using proteomics and Northern blot analysis, respectively. This indicates that our proteomic approach is useful for identifying defense‐related proteins. We also identified several other proteins that are induced by SA or wounding. Among the seven SA‐induced proteins identified, four may be defense‐related, including defense‐related protein, phospholipase D (PLD), resistance protein RPS2 homolog, and L‐ascorbate peroxidase. Out of the six wounding‐induced proteins identified, three may be defense‐related: heat shock cognate protein 70 (HSC70), polygalacturonase, and peroxidase P7. The precise functions of these proteins in plant defense responses await further study. However, identification of the defense‐related proteins described in this study should allow us to better understand the mechanisms and signal transduction pathways involved in defense responses in Chinese cabbage.","PeriodicalId":85060,"journal":{"name":"Korean journal of biological sciences","volume":"7 1","pages":"213 - 219"},"PeriodicalIF":0.0,"publicationDate":"2003-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/12265071.2003.9647707","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"59655744","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 8

Induction of in vitro vitellogenin synthesis by bisphenol, nonylphenol and octylphenol in Chinese minnow (phoxinus oxycephalus) hepatocytes 双酚、壬基酚和辛基酚诱导中国鲦鱼肝细胞体外合成卵黄蛋白原的研究

Korean journal of biological sciences Pub Date : 2003-01-01 DOI: 10.1080/12265071.2003.9647709

Chang-Beom Park, Byung Ho Kim, O. Na, Y. Choi, Young don Lee, H. Baek, Hyung Bae Kim, A. Takemura

{"title":"Induction of in vitro vitellogenin synthesis by bisphenol, nonylphenol and octylphenol in Chinese minnow (phoxinus oxycephalus) hepatocytes","authors":"Chang-Beom Park, Byung Ho Kim, O. Na, Y. Choi, Young don Lee, H. Baek, Hyung Bae Kim, A. Takemura","doi":"10.1080/12265071.2003.9647709","DOIUrl":"https://doi.org/10.1080/12265071.2003.9647709","url":null,"abstract":"Bisphenol A (BPA), nonylphenol (NP), and 4‐tert‐octylphenol (OP) are known endocrine disrupting chemicals (EDCs) with estrogenic activity in fish. This study compared the effects of BPA, NP and OP on in vitro vitellogenin (VTG) synthesis in primary cultures of hepatocytes of the Chinese minnow Phoxinus oxycephalus. The VTG secreted into the culture medium was measured using enzyme‐linked immunosorbent assay (ELISA), which we developed in this study using an antibody prepared from homogenates of Chinese minnow egg. VTG synthesis was induced by estradiol‐17β (E2) and phenols (BPA, NP and OP) treatment. E2 at concentrations of 10‐6 M or higher increased VTG levels significantly (P<0.05). Exposure to 10‐5 M BPA or 10‐4 M NP and OP induced in vitro VTG synthesis (P<0.01). However, 10‐3 M BPA, NP or OP did not induce VTG synthesis. These results suggest that BPA has the highest estrogenic potential in Chinese minnow hepatocytes. Tamoxifen, an anti‐estrogen, drastically blocked the production of VTG by phenols (BPA, NP and OP) suggesting that phenols (BPA, NP and OP) may act via binding to estrogen receptor (ER) in Chinese minnow hepatocytes.","PeriodicalId":85060,"journal":{"name":"Korean journal of biological sciences","volume":"7 1","pages":"227 - 235"},"PeriodicalIF":0.0,"publicationDate":"2003-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/12265071.2003.9647709","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"59655823","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 14

Genetic polymorphism of vascular endothelial growth factor (VEGF C936T) in the Korean population 血管内皮生长因子(VEGF C936T)在韩国人群中的遗传多态性

Korean journal of biological sciences Pub Date : 2003-01-01 DOI: 10.1080/12265071.2003.9647713

Jin Kyeoung Kim, D. Oh, S. Kwak, Jingjun Han, Y. Chung, N. Kim

{"title":"Genetic polymorphism of vascular endothelial growth factor (VEGF C936T) in the Korean population","authors":"Jin Kyeoung Kim, D. Oh, S. Kwak, Jingjun Han, Y. Chung, N. Kim","doi":"10.1080/12265071.2003.9647713","DOIUrl":"https://doi.org/10.1080/12265071.2003.9647713","url":null,"abstract":"Vascular endothelial growth factor (VEGF) is a potent regulator of normal and abnormal angiogenesis. Recent literature suggests that VEGF has several activities that may amplify acute inflammation reactions. Dysregulated VEGF expression has been implicated as a major contributor to the development of a number of common disease pathologies. One of common mutations in the 3'‐untranslated region of the VEGF gene, a C?T exchange at nucleotide position 936, has been found to be significantly associated with VEGF expression levels in the plasma from a previous Austrian study. The frequency of this mutation could be important genetic information regarding tumor growth and angiogenesis related diseases. The aim of this study was to investigate the frequency distribution of this mutation in general Korean population. We examined the statistical data from 207 healthy Korean subjects. Observed numbers (%) of 936T were 28.5 (CT) and 3.9 (TT), respectively. The mutant allele frequency of 936T in Korean subjects was 0.18, which appeared somewhat higher than that in Austrian subjects.","PeriodicalId":85060,"journal":{"name":"Korean journal of biological sciences","volume":"7 1","pages":"261 - 264"},"PeriodicalIF":0.0,"publicationDate":"2003-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/12265071.2003.9647713","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"59655906","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 7

Genotype distribution of the mutations in the coagulation factor V gene in the Korean population: Absence of its association with coronary artery disease 韩国人群中凝血因子V基因突变的基因型分布:与冠状动脉疾病的相关性缺失

Korean journal of biological sciences Pub Date : 2003-01-01 DOI: 10.1080/12265071.2003.9647712

Seung-Ho Hong

引用次数: 5