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Comparison of Performances between Brown and White Egg Layers (백색산란계와 갈색산란계의 생산성 비교)

  • 이규호
    • Korean Journal of Poultry Science
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    • v.25 no.3
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    • pp.119-128
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    • 1998
  • On account of the recent improvement in performance of brown layers, the market share taken by brown layers has increased to about 50% in the world and to almost 100% in Korea. There are several other reasons why the industry has moved from white to brown, such as : brown layers are used to be more robust, more docile and easier to manage ; e brown layers are easier to sex at the hatchery ; brown layers lay less second grade eggs, due to a better shell Quality ; brown eggs seem to be more attractive than white ; and a clear consumer preference, thus a better price per egg. More recently, however, the trend towards brown eggs has been slowing down. The main reasons for this lie in that white layers can still produce an egg at a lower cost and that white eggs have better de-shelling properties, easier candling and higher yolk and solid content of the liquid egg which are benefits for egg processing industry. Although the performance of the brown layers is still improving, there are increasing opinions in the poultry industry that the market portion of white layers should be increased based on the following reasons, such as : shell color has no effect on the nutritive value of eggs ; . brown layers consume more feed ; the percentage of meat spots is significantly higher in brown eggs than in white eggs ; . brown layers are less efficient in the second cycle of production than in the first ; white layers are more resistant to the disease of fowl typhoid. In order to increase the market share of white layers in Korea, it may be needed to enlighten the consumers not to prefer the brown and large eggs and to inform the excellencies of white eggs widely.

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Gene Microarray Analysis for Porcine Adipose Tissue: Comparison of Gene Expression between Chinese Xiang Pig and Large White

  • Guo, W.;Wang, S.H.;Cao, H.J.;Xu, K.;Zhang, J.;Du, Z.L.;Lu, W.;Feng, J.D.;Li, N.;Wu, C.H.;Zhang, L.
    • Asian-Australasian Journal of Animal Sciences
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    • v.21 no.1
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    • pp.11-18
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    • 2008
  • We created a cDNA microarray representing approximately 3,500 pig genes for functional genomic studies. The array elements were selected from 6,494 cDNA clones identified in a large-scale expressed sequence tag (EST) project. These cDNA clones came from normalized and subtracted porcine adipose tissue cDNA libraries. Sequence similarity searches of the 3,426 ESTs represented on the array using BLASTN identified 2,790 (81.4%) as putative human orthologs, with the remainder consisting of "novel" genes or highly divergent orthologs. We used the gene microarray to profile transcripts expressed by adipose tissue of fatty Chinese Xiang pig (XP) and muscley Large White (LW). Microarray analysis of RNA extracted from adipose tissue of fatty XP and muscley LW identified 81 genes that were differently expressed two fold or more. Transcriptional differences of four of these genes, adipocyte fatty acid binding protein (aP2), stearyl-CoA desaturase (SCD), sterol regulatory element binding transcription factor 1 (SREBF1) and lipoprotein lipase (LPL) were confirmed using SYBR Green quantitative RT-PCR technology. Our results showed that high expression of SCD and SREBF1 may be one of the reasons that larger fat deposits are observed in the XP. In addition, our findings also illustrate the potential power of microarrays for understanding the molecular mechanisms of porcine development, disease resistance, nutrition, fertility and production traits.

Feeding habits of white croaker, Pennahia argentata in the coastal waters off Sejon island, Korea (한국 남해안 세존도 주변 해역에 출현하는 보구치 (Pennahia argentata)의 식성)

  • Koh, Eun-Hye;An, Young-Su;Baeck, Gun-Wook;Jang, Choong-Sik
    • Journal of the Korean Society of Fisheries and Ocean Technology
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    • v.50 no.2
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    • pp.139-146
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    • 2014
  • Feeding habits of white croacker, Pennahia argentata, were analyzed by using the stomach contents of 153 specimens caught by bottom trawl from May 2011 to March 2012 in the Sejon island, Korea. To know feeding habits of the white croacker, P. argentata, a species composition and it's fluctuation were analyzed based on growth. White croacker, P. argentata caught in the area composes 15 species. The most species in an number of the prey was Macrura which was occupied at 66.4% from whole prey, the second most species was Pisces which was occupied at 20.3%. The most species in an wet-weight of the prey was Pisces which was 49.3% out of the whole specimens. The second most species was Macrura which was 43.3%. The frequency occurrence of the prey was Macrura which was 68.6%, the next one was Pisces which was 28.8%. The highest Index of Relative Importance (IRI) of the prey was Macrura which was 78.2%, the next one was Pisces which was 28.8%. A number of the prey per specimen of small, middle and large class were 1.3, 1.5, 1.7, respectively. A wet weight of the prey per specimen of small, middle and large class were 0.2, 0.6, 0.2 g, respectively.

Ultrastructure of Normal and Inside White Part in Korea Red Ginseng (홍삼의 정상 및 내백부의 미세구조)

  • Park, Hoon;Cho, Byung-Goo;Lee, Seong-Jun
    • Journal of Ginseng Research
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    • v.12 no.2
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    • pp.153-157
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    • 1988
  • Ultrastructure of inside white part was compared with normal part in Korea Red ginseng by scanning electron microscope. The inside white part was in number and smaller inside of starch particle than those in the normal. The large membranous components in the inside white part seemed to be thinner than those in the normal. Thin membranous components may be related to lower protein content as previously reported. Starch particles in red ginseng were flat and amorphous.

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A Study on the Recognition of Display Type with the Arrangement and the Color Contrast (배열과 색대비를 고려한 표제용 글자 인식에 관한 연구)

  • 정성재;이근희;오형술
    • Journal of the Society of Korea Industrial and Systems Engineering
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    • v.18 no.36
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    • pp.71-82
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    • 1995
  • The readability and the visuability are very significant when the letters or figures are displayed as static visual information. Not only is the beauty of the body type character(small letters) important but the display type character(large letters) should also be read easily, quickly and precisely. The issue regarding the readability in terms of perception of information has been raised continuously for all kinds of small signage and billboard, etc., which are written in display type within our everyday life. Among the various kinds of small signage and billboards the car licence plate is well known. Among all the possible factors that would have made an impact on the readability of licence plate, this paper focused on the effects of arrangement of character(letters and figures) and contrast of colors for the readability of licence plate using the within-subject analysis. The statistical analysis results in error reading rate, the character arrangement were significant but the color contrast(green/white, white/green, blue/white, white/blue, black/yellow) was not, No interaction was found.

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A Study on Insulation Property of White Powder Found on High Voltage Motor Stator Winding (백화현상이 나타난 고압전동기 고정자권선의 절연특성 연구)

  • Kong, Tae-Sik;Kim, Hee-Dong;Lee, Sang-Kil;Kim, Kyeong-Yeol;Ju, Young-Ho
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.60 no.8
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    • pp.1627-1631
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    • 2011
  • During a routine inspection of a large pump motor at power plant, white powder was found on the surface of the stator end windings. Visual inspection and high voltage insulation diagnosis was performed to determine whether this motor is available. The purpose of this paper is to understand the insulation properties of white powder found on high voltage stator and to know prevention of insulation weakness.

The Fabrication and Characteristics of White Emission using CCM on Flexible Substrate (플렉시블 무기EL 색변환 백색 발광 소자 제작 및 특성평가)

  • Kim, Gi-Ryoung;Ahn, Sung-Il;Kum, Jeong-Hun;Lee, Heung-Ryeol;Yim, Tae-Hong;Lee, Seong-Eui
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.21 no.10
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    • pp.911-915
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    • 2008
  • EL (electro-luminescent) device as a light source has an advantage in embodying large area with great flexibility. On nickel foil as an electrode and backplane, we demonstrated a white EL flexible light source with blue phosphor layer combined with color change layer. A correlation between color change layer and color coordination was analyzed by Gaussian method, and then the color coordinate was controlled near to (0.33, 0.33) of pure white light.

Effect of Primarily Solidified Structure on the Microstructure and the Mechanical Properties of High Cr White Iron (고크롬 백주철의 미세조직과 기계적 특성에 미치는 초기응고 조직의 영향)

  • Jo, Hyun-Wook;Do, Jeong-Hyeon;Jo, Won-Je;Chung, Hyun-Deuk;Lee, Je-Hyun;Jo, Chang-Yong
    • Journal of Korea Foundry Society
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    • v.35 no.6
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    • pp.178-184
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    • 2015
  • Due to excellent abrasion resistance the high-chrome white irons are widely used in mining and mineral industries. Minor variation of carbon content in 28% chrome white iron resulted in difference in primarily solidified microstructure. Sub-eutectic (hypoeutectic) composition led to formation of primarily solidified dendrites. Formation of primarily solidified dendrites which were supersaturated with carbon and chrome also caused precipitation of fine secondary carbides that are different from relatively large plate type $M_7C_3$ carbides in the eutectic structure. Small portion of primarily solidified dendrite expected to contribute significantly to the improvement of abrasion resistance of the white iron because the dendrites provided mechanical support to carbides. The relative fraction of primary dendrite increased with reduction of carbon content from the eutectic composition. The increased fraction of primary dendrite increased hardness value of the white irons.

Structure and Function of the Reproductive System of Aplysia kurodai

  • Lee, Chi-Hoon;Kaang, Bong-Kiun;Lee, Young-Don
    • Development and Reproduction
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    • v.19 no.4
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    • pp.197-207
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    • 2015
  • This study investigated structure and function of the reproductive system in Aplysia kurodai by means of anatomical, histological, and histochemical observation. Reproductive system of this species is consisted of ovotestis, small hermaphroditic duct, ampulla, accessory genital mass and large hermaphroditic duct. The ovotestis is composed of a large number of follicles, and both oocytes and spermatocytes matured in the same follicle. The small hermaphroditic duct is a single tube and contains a swelling, the ampulla, which functions as a storage organ for endogenous sperm and an oviduct. The accessory genital mass is connected to both the small and large hermaphroditic duct, and consisted of three glands: albumen, membrane (winding) and mucus gland. The albumen gland is consisted of granular cells producing basophilic and neutral mucopolysaccharides. The membrane and mucus gland are consisted of granular cells producing acidophilc and sulfated mucopolysaccharides. The large hermaphroditic duct is a single tubular gonoduct linking the accessory genital mass to the common genital aperture but is consisted of two parallel compartments. Internally, these two compartments are incompletely divided by internal septum or fold, which are called as the red hemiduct and white hemiduct, respectively. The red hemiduct functions as an oviduct and the white hemiduct functions as a copulatory duct. The reproductive system of A. kurodai is externally comprised a single tube, i.e., monaulic type. However, internal structure of duct is incompletely divided into oviduct and copulatory duct, i.e., the oodiaulic type.

Sequence Validation for the Identification of the White-Rot Fungi Bjerkandera in Public Sequence Databases

  • Jung, Paul Eunil;Fong, Jonathan J.;Park, Myung Soo;Oh, Seung-Yoon;Kim, Changmu;Lim, Young Woon
    • Journal of Microbiology and Biotechnology
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    • v.24 no.10
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    • pp.1301-1307
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    • 2014
  • White-rot fungi of the genus Bjerkandera are cosmopolitan and have shown potential for industrial application and bioremediation. When distinguishing morphological characters are no longer present (e.g., cultures or dried specimen fragments), characterizing true sequences of Bjerkandera is crucial for accurate identification and application of the species. To build a framework for molecular identification of Bjerkandera, we carefully identified specimens of B. adusta and B. fumosa from Korea based on morphological characters, followed by sequencing the internal transcribed spacer region and 28S nuclear ribosomal large subunit. The phylogenetic analysis of Korean Bjerkandera specimens showed clear genetic differentiation between the two species. Using this phylogeny as a framework, we examined the identification accuracy of sequences available in GenBank. Analyses revealed that many Bjerkandera sequences in the database are either misidentified or unidentified. This study provides robust reference sequences for sequence-based identification of Bjerkandera, and further demonstrates the presence and dangers of incorrect sequences in GenBank.