Korea University

About: Korea University is a education organization based out in Seoul, South Korea. It is known for research contribution in the topics: Population & Catalysis. The organization has 39756 authors who have published 82424 publications receiving 1860927 citations. The organization is also known as: Bosung College & Bosung Professional College.

Characterization of a Rice Chlorophyll-Deficient Mutant Using the T-DNA Gene-Trap System

Abstract: We have previously generated a large pool of T-DNA insertional lines in rice. In this study, we screened those T-DNA pools for rice mutants that had defective chlorophylls. Among the 1,995 lines examined in the T2 generation, 189 showed a chlorophyll-deficient phenotype that segregated as a single recessive locus. Among the mutants, 10 lines were beta-glucuronidase (GUS)-positive in the leaves. Line 9-07117 has a T-DNA insertion into the gene that is highly homologous to XANTHA-F in barley and CHLH in Arabidopsis: This OsCHLH gene encodes the largest subunit of the rice Mg-chelatase, a key enzyme in the chlorophyll branch of the tetrapyrrole biosynthetic pathway. In the T2 and T3 generations, the chlorina mutant phenotypes are co-segregated with the T-DNA. We have identified two additional chlorina mutants that have a Tos17 insertion in the OsCHLH gene. Those phenotypes were co-segregated with Tos17 in the progeny. GUS assays and RNA blot analysis showed that expression of the OsCHLH gene is light inducible, while TEM analysis revealed that the thylakoid membrane of the mutant chloroplasts is underdeveloped. The chlorophyll content was very low in the OschlH mutants. This is the first report that T-DNA insertional mutagenesis can be used for functional analysis of rice genes.

Adaptive binary splitting for efficient RFID tag anti-collision

Abstract: Tag collision arbitration for passive RFID tags is a significant issue for fast tag identification. This letter presents a novel tag anti-collision scheme called adaptive binary splitting (ABS). For reducing collisions, ABS assigns distinct timeslots to tags by using information obtained from the last identification process. Our performance evaluation shows that ABS outperforms other tree based tag anti-collision protocols.

The Prognosis and Survival Outcome of Intrahepatic Cholangiocarcinoma Following Surgical Resection: Association of Lymph Node Metastasis and Lymph Node Dissection with Survival

Abstract: Surgical resection has been shown to improve long-term survival for patients with intrahepatic cholangiocarcinoma (ICC). The benefit of lymph node dissection is still controversial. The aims of this study were to investigate the prognostic factors of ICC and to examine the impact of lymph node metastasis and extent of lymph node dissection on survival. A total of 64 patients with ICC were operated on with curative intent and resultant macroscopic curative resection (R0 and R1). The patients were classified according to the extent of the lymph node dissection. Clinicopathological characteristics and survival were reviewed retrospectively. All patients underwent anatomical resection. The 5-year survival rates were 39.5%. Multivariate analysis revealed that lymph node metastasis (hazard ratio: 3.317) was an independent prognostic factors on survival. Recurrence occurred in 41 patients. Median disease-free survival time was 12.3 months. Tumor differentiation was an independent prognostic factor for disease-free survival (hazard ratio: 3.158). The extent of lymph node dissection did not affect the occurrence of complication. Regional + α lymph node dissection group demonstrated similar survival to those of lymph node sampling group, although significant high incidence of lymph node metastases was observed in the regional + α lymph node dissection group. The extent of lymph node dissection did not affect the survival in the patients without lymph node involvement. The regional + α lymph node dissection enhanced the survival in the ICC patients with lymph node metastasis, and the exact nodal status could be confirmed by lymph node dissection in the pericholedochal lymph nodes.

Search for resonances and quantum black holes using dijet mass spectra in proton-proton collisions at s =8TeV

Abstract: A search for resonances and quantum black holes is performed using the dijet mass spectra measured in proton-proton collisions at s√=8 TeV with the CMS detector at the LHC. The data set corresponds to an integrated luminosity of 19.7 fb^(−1). In a search for narrow resonances that couple to quark-quark, quark-gluon, or gluon-gluon pairs, model-independent upper limits, at 95% confidence level, are obtained on the production cross section of resonances, with masses above 1.2 TeV. When interpreted in the context of specific models the limits exclude string resonances with masses below 5.0 TeV; excited quarks below 3.5 TeV; scalar diquarks below 4.7 TeV; W′ bosons below 1.9 TeV or between 2.0 and 2.2 TeV; Z′ bosons below 1.7 TeV; and Randall-Sundrum gravitons below 1.6 TeV. A separate search is conducted for narrow resonances that decay to final states including b quarks. The first exclusion limit is set for excited b quarks, with a lower mass limit between 1.2 and 1.6 TeV depending on their decay properties. Searches are also carried out for wide resonances, assuming for the first time width-to-mass ratios up to 30%, and for quantum black holes with a range of model parameters. The wide resonance search excludes axigluons and colorons with mass below 3.6 TeV, and color-octet scalars with mass below 2.5 TeV. Lower bounds between 5.0 and 6.3 TeV are set on the masses of quantum black holes.