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Kernel Characteristics of the Modified Opaque-2 Systhetics, Zea mays, L. (변갱 오페이크-2 옥수수의 종실특성)

  • Bong-Ho Chae
    • KOREAN JOURNAL OF CROP SCIENCE
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    • v.31 no.1
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    • pp.49-55
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    • 1986

  • To obtain basic information required for improving grain yield of the two modified opaque-2 synthetics, which have been developed at College of Agr., Chungnam National Univ. in 1980 and named as Puyo No.2 and No.3, physical kernel characteristics of the two synthetics were fully investigated and results obtained are as follows: Puyo No.2 synthetics had a smaller kernel size with lighter weight than the Puyo No.3. The Puyo No.2 synthetics had higher kernel density than the Puyo No.3 with large Kernel size. The Puyo No.2 had kernels with heterogenous endosperm phenotypes. Some kernels had mottled patches on endosperm, while other kernels 1/2 and 1/2 phenotypes. All the modified opaque-2 synthetics had somewhat lighter endosperm weight than the normal check hybrid. The Puyo No.2 synthetics with smaller kernel size had more germ portion compared with large kernel, Puyo No.3. The Puyo No.2 had shown also typical endosperm texture when observed under microscope after cutting by glass knife. The lysine content of the Puyo No.2 was higher than those of other varieties studied. Breeding schemes to improve the yield capacity of the two modified opaue-2 synthetics were discussed.

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Cracking in Welds and Its Prevention(II) - Cracks in Welds and Hot Cracking(I) - (용접부의 균열 및 그 방지(II) - 균열의 종류 및 고온균열(I)-)

  • 박화순
    • Journal of Welding and Joining
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    • v.20 no.2
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    • pp.1-3
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    • 2002

  • 전 호에서는 용접부와 밀접한 관계가 있는 가스의 성질 및 가스가 용접부에 미치는 영향에 대하여 서술하였다. 본 호에서는 용접부의 균열 및 그 방지에 대하여, 먼저 용접 부에서 발생하는 균열의 종류와 고온균열 중의 일부를 소개하기로 한다 고온균열은 응고균열, 연성저하균열, 액화균열로 크게 나눌 수 있으며, 총 3회에 나누어 서술한다.

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