http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
- 中文 을 입력하시려면 zhongwen을 입력하시고 space를누르시면됩니다.
- 北京 을 입력하시려면 beijing을 입력하시고 space를 누르시면 됩니다.
RISS 인기검색어
- 검색키워드
- 저자 : YUAN Q. R. (검색결과 3 건)
- 무료
- 기관 내 무료
- 유료
-
SPATIAL DISTRIBUTION OF THE SPIN VECTORS OF THE DISK GALAXIES IN THE VIRGO CLUSTER
YUAN Q. R.,HU F. X.,HE X. T. The Korean Astronomical Society 1996 Journal of The Korean Astronomical Society Vol.29 No.suppl1
In order to investigate the spatial orientation of the spin vectors of galaxies in the Virgo cluster, we carried out a detailed identification of all the certain and possible member disk galaxies with four UK Schmidt Telescope (UKST) III a-j direct plates digitized by the Automated Plate Measuring System (APM). As a result, a relatively large and complete database with no selection effect of the member galaxies has been established. We provide the APM measured values of the position angle (P.A.) and diameters at the isophotal level of 24.5 $m_j / arcsec^2$. Based on this newly generated database, an initial study on the spatial orientation of the spin vectors of galaxies in the Virgo cluster is shown.
-
Modification of the degree of 4-O-methylation of secondary wall glucuronoxylan
Yuan, Y.,Teng, Q.,Lee, C.,Zhong, R.,Ye, Z.H. Elsevier Scientific Publishers Ireland Ltd 2014 Plant science Vol.219 No.-
Plant secondary walls are the major constituent of plant biomass targeted for second-generation biofuel production. Therefore, a thorough understanding of how secondary walls are constructed is critical for a better utilization of plant biomass for biofuel production. One of the major components in secondary walls is xylan, which is composed of a linear chain of β-1,4-linked xylosyl residues. In Arabidopsis, about 10% of xylosyl residues in xylan are substituted with glucuronic acid (GlcA), of which 60% are methylated at O-4. By contrast, all of the GlcA substituents in Populus xylan are methylated at O-4. It is not known how the degree of GlcA methylation in xylan is controlled. In this report, we demonstrated that simultaneous T-DNA knockout mutations of the three glucuronoxylan methyltransferase (GXM) genes, GXM1, GXM2, and GXM3/GXMT1, which are specifically expressed in secondary wall-forming cells, led to a complete loss of GlcA methylation in xylan in Arabidopsis stems. Overexpression of GXM2 and GXM3 in wild-type Arabidopsis resulted in an up to 5-fold increase in glucuronoxylan methyltransferase activity and as a result, up to 90% of the GlcA side chains in xylan were methylated as opposed to 60% seen in the wild type. The increased degree of GlcA methylation in xylan had no discernable effects on cell wall sugar composition and lignin monomer composition. These results reveal that the activities of GXM1, GXM2 and GXM3 are responsible for all of the GlcA methylation in xylan in Arabidopsis stems and that the degree of GlcA methylation in xylan can be modified by altered expression of GXMs.
-
COMMON FEATURES OF SPATIAL ORIENTATION OF DISK GALAXIES IN THE COMA AND VIRGO CLUSTER
Hul F. X.,Wu G. X.,SU H. J.,LIU Y. Z.,YUAN Q. R. The Korean Astronomical Society 1996 Journal of The Korean Astronomical Society Vol.29 No.suppl1
Based on the database of 128 disk galaxies (66 SO, 62 S and Irr) mailnly compiled from Kent and Gunn (1982) and Doi et a1.(1995) which is complete down to m < 15.6 mag within a radius of $3^{\circ}$, the orientation of spin vectors of disk galaxies of the Coma cluster has been analyzed. The results confirm the morphological dependence of the orientation of disk galaxies found from the analsis of the Virgo cluster. Common features of orientation of disk galaxies of both clusters are outlined.
ScienceON
코리아스칼라연관 검색어 추천
이 검색어로 많이 본 자료
활용도 높은 자료
