• Title/Summary/Keyword: Seeding effect

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Texture Development in Liquid-Phase-Sintered β -SiC by Seeding with β -SiC Whiskers

  • Kim, Won-Joong;Roh, Myong-Hoon
    • Journal of the Korean Ceramic Society
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    • v.43 no.3 s.286
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    • pp.152-155
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    • 2006
  • Silicon carbide ceramics seeded with 10-30 wt% SiC whiskers are fabricated by hot pressing and annealing. A quantitative texture analysis including calculation of the Orientation Distribution Function (ODF) is used for obtaining the degrees of preferred orientation of the fabricated samples. The microstructure and crystallographic texture are discussed with respect to the effect of ${\beta}-SiC$ whisker seeds on the resulting fracture toughness values. The SEM microstructures and the texture data reveal a correlation between texture and fracture toughness anisotropy.

Study on the Bottom Watering for Growing of Tobacco Seedling I. Effect of Bottom Watering on Seedling Growth arid Temperature of Seedbed (담배육묘를 위한 저면관수 연구 I. 저면관수가 묘의 생장 및 묘상 온도에 미치는 영향)

  • 반유선;한종구;신승구;류익상
    • Journal of the Korean Society of Tobacco Science
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    • v.14 no.1
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    • pp.42-47
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    • 1992
  • This study was conducted to determine the effects of the bottom watering method on seedling growth, temperature of seedbed and working hours. The results of compared conventional watering with bottom watering were as follows: 1. The lowest and highest temperature on surface of bottom watering seedbed were higher about 2-3$^{\circ}C$ and 3-5$^{\circ}C$ than those of conventional plot, respectively. 2. At 30 days after seeding, flesh and dry weight of seedling in bottom watering seedbed were heavier about 121% and 62% than those of seedling in conventional plot, respectively, while dry ratio of that was lower about 30.2%. 3. Plant height of transplanting seedling in bottom watering seedbed was higher about 4-5cm than that of seedling in conventional plot. Otherwise, ratio of top to root and length of root were not significant. 4. Working hours of bottom watering for growing seedling were reduced 40.9% and 53.4% in primary and secondary seedbeds as compared with those of conventional plot, respectively.

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Expression of Stat5a Gene in Bovine Mammary Gland and its Effect on Proliferation of Mammary Epithelial Cells

  • Jeon, D.H.;Choi, Y.J.;Baik, M.G.
    • Asian-Australasian Journal of Animal Sciences
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    • v.15 no.8
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    • pp.1198-1203
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    • 2002
  • To understand molecular mechanisms involved in bovine mammary gland growth, expression of stat5a gene was examined in bovine mammary tissues. We found that stat5a gene was highly induced at pregnant 7 and 8 months compared to virgin mammary tissues. To examine function of bovine stat5a in mammary epithelial cell proliferation, stat5a expression vector was transfected into mammary epithelial HC11 cells. Cell proliferation rate in stat5a gene-transfected cells was 26%, 95% and 85% higher at 24 h, 48 h and 72 h after seeding, respectively, compared to control vector-transfected cells. Results demonstrate that bovine stat5a enhances proliferation of mammary epithelial cells.

Screening and effect of antagonists for biological control of plant pathogen (모잘록병의 생물학적 방제를 위한 유효 미생물 선발방법 및 효과)

  • Lee, Baek-Seok;Choe, Seong-Won;Choe, Gi-Hyeon;Lee, Jae-Ho;Kim, Eun-Gi
    • 한국생물공학회:학술대회논문집
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    • 2002.04a
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    • pp.386-389
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    • 2002
  • Antagonistic Bacillus sp. #16 to phytopathogenic fungi were selected based on the growth rate, inhibition rate and surface tension reduction. Based on the 16S rRNA sequences, Bacillus sp. #16 is closely related to the B. subtilis DSM10. In the pot test, Bacillus sp. #16 show the most effective growth inhibition against damping-off disease of cucumber seeding.

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Effect of Expanded Rice Husk Medium on Rice Seedling for Machine Transplanting

  • Ko Jonghan;Kim Doo Yeol;Sa Jong Gu;Lee Byun Woo;Lee Youn Su
    • KOREAN JOURNAL OF CROP SCIENCE
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    • v.50 no.1
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    • pp.55-59
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    • 2005
  • Rice farmers can save labor and expenses by using expanded rice husk (ERH) as a seedling medium since ERH is lighter and cheaper than other commercial seedling media (CSM). This study was carried out to develop a method for rice seedling cultivation using ERH as a seedling medium. It is suggested that a mixture of $60\%$ of ERH and $40\%$ of a CSM could be used as a seedling medium; the planting densities would be 240g per tray for infant seedlings and 200 g for young seedlings; and nitrogen (N) would be applied at a rate of 1g per tray for infant seedlings prior to planting and 2g per tray for young seedlings with division. Great care should be taken to use $CO(NH_2)_2$ as an N-source fertilizer. These results would lay a foundation for the rice seedling cultivation with ERH as a medium.

Freezing Methods of Canine Semen to Achieve Good post-Thaw Viability of Sperm (개 정액의 융해후 정자의 생존율 향상을 위한 동결 방법)

  • 지동범;김용준
    • Journal of Veterinary Clinics
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    • v.17 no.2
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    • pp.420-430
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    • 2000
  • These studies were preformed to investigate the freezing conditions to achieve good post-thaw viability of spend and the practical methods of artificial insemination frozen canine semen. Semen were collected from nine male dogs which had been proved to be fertile in the past and the semen were treated for freezing procedure. Post-thaw motility and viability of canine sperm were evaluated to investigate individual tolerance of freezing, difference among freezing extenders, dif-ference among freezing equipments and freezing conditions, difference between fast and slow cooling rate, difference according to different glycerol concentration, effect of seeding on post-thaw viability, difference according to cutting part of straw, difference according to thawing temperatures, and dif-ference according to media added to thawed semen. Thawed semen for insemination were added with equal volnme of canine capacitation medium (CCM) and the volume of semen and the number per insemination were adjusted as 2-3 ml and $20-30 {\times}10^7,$ respectively. The semen were inseminated in vagina using balloon catheter and en17ryos were cellected from 9 to 11 days after the second Al to d determine fertilization.

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One Case of Stage IV Gastric Cancer Patient by Treatment of Rhus vernifciflua Stokes Decoction (옻나무 전탕추출물 치료를 받은 위암 IV기 환자 1례)

  • Kim, Bo-Geun;Park, Sang-Chae
    • Journal of Korean Traditional Oncology
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    • v.18 no.1
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    • pp.17-22
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    • 2013
  • Objectives : The aim of this report is to evaluate antitumor efficacy of Rhus vernifciflua STOKES decoction (Chijong-tang). Methods : One advanced gastric cancer patient with peritoneal seeding and mesenteric metastasis visited Hana integrative Clinic of Korean medicine in Aug 2012 and was treated with Chijong-tang for 14 months. Results : Chijong-tang showed no side effect during its treatment (Aug 2012 ~ Oct 2013) and the patient showed no disease progression. Conclusion : This case report suggests that Rhus vernifciflua Stokes decoction (Chijong-tang) can be a potent anticancer agent for gastric cancer, but it still required further scientific and clinical evidence.

Synthesis of zeolite MFI films on alumina and silicon supports using seed crystals (알루미나와 실리콘 지지체에 종자결정에 의한 제올라이트 MFI 필름의 합성)

  • Ko, Tae-Seog
    • Journal of the Korean Crystal Growth and Crystal Technology
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    • v.18 no.1
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    • pp.38-44
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    • 2008
  • Contiuous c-oriented zeolite MFI films $(<35{\mu}m)$ were prepared by hydrothermal secondary growth of silicalite-1 seed crystal in the surface of alumina porous substrate and silicon substrate. The supported films were characterized with scanning electron microscopy and X-ray diffraction. Effect of substrate surface roughness were investigated and a mechanism for c-oriented film formation and characteristic dom-like defects formation which is observed after seeding growth was discussed. The roughness of substrate plays an important role.