Niche-specification of aerobic 2,4-dichlorophenoxyacetic acid biodegradation by -carrying bacteria in the rice paddy ecosystem.

This study aimed for a better understanding of the niche specification of bacteria carrying the -genes for aerobic 2,4-dichlorphenoxyacetic acid (2,4-D) degradation in the rice paddy ecosystem. To achieve this, a dedicated microcosm experiment was set up to mimic the rice paddy system, with and without 2,4-D addition, allowing spatial sampling of the different rice paddy compartments and niches, i.e.

Synthesis of Up-Conversion CaTiO: Er Films on Titanium by Anodization and Hydrothermal Method for Biomedical Applications.

The present study investigates the effects of Er doping content on the microstructure and up-conversion emission properties of CaTiO: Er phosphors as a potential material in biomedical applications. The CaTiO: %Er ( = 0.5, 1.

Synthesis of Heterostructured TiO Nanopores/Nanotubes by Anodizing at High Voltages.

This paper reports on the coating of heterostructured TiO nanopores/nanotubes on Ti substrates by anodizing at high voltages to design surfaces for biomedical implants. As the anodized voltage from 50 V to 350 V was applied, the microstructure of the coating shifted from regular TiO nanotubes to heterostructured TiO nanopores/nanotubes. In addition, the dimension of the heterostructured TiO nanopores/nanotubes was a function of voltage.

Analysis of the structure and luminescence properties of Zn GeO :Eu according to Judd-Ofelt theory.

The preparation and characteristic of nanorod-like Zn GeO doped with Eu or zinc germanate (ZGO):xEu (x = 0 ÷ 0.05), which was synthesized using the hydrothermal method, are described. The influence of Eu -doping ions on the structure and the optical properties of ZGO was also investigated.

Dumbbell configuration of silicon adatom defects on silicene nanoribbons.

Using density functional theory (DFT), we performed theoretical investigation on structural, energetic, electronic, and magnetic properties of pure armchair silicene nanoribbons with edges terminated with hydrogen atoms (ASiNRs:H), and the absorptions of silicon (Si) atom(s) on the top of ASiNRs:H. The calculated results show that Si atoms prefer to adsorb on the top site of ASiNRs:H and form the single- and/or di-adatom defects depending on the numbers. Si absorption defect(s) change electronic and magnetic properties of ASiNRs:H.

In situ observation of phase transformation in iron carbide nanocrystals.

This paper reports on the in situ observation of phase transformation in an iron carbide nanocrystal encapsulated in a graphitic shell by means of high resolution transmission electron microscopy (HR-TEM). A FeC nanocrystal in orthorhombic (o-FeC) structure with carbon graphitic cover is captured at the initial time of the experiment. Under the projection of a high-energy electron beam (200kV), the graphitic carbon layer evaporates gradually and structural changes in orthorhombic (o-FeC) crystal manifests simultaneously.

Inhibition of Phagocytic Killing of Escherichia coli in Drosophila Hemocytes by RNA Chaperone Hfq.

An RNA chaperone of Escherichia coli, called host factor required for phage Qβ RNA replication (Hfq), forms a complex with small noncoding RNAs to facilitate their binding to target mRNA for the alteration of translation efficiency and stability. Although the role of Hfq in the virulence and drug resistance of bacteria has been suggested, how this RNA chaperone controls the infectious state remains unknown. In the present study, we addressed this issue using Drosophila melanogaster as a host for bacterial infection.

Enhanced magnetic anisotropy and heating efficiency in multi-functional manganese ferrite/graphene oxide nanostructures.

A promising nanocomposite material composed of MnFe2O4 (MFO) nanoparticles of ∼17 nm diameter deposited onto graphene oxide (GO) nanosheets was successfully synthesized using a modified co-precipitation method. X-ray diffraction, transmission electron microscopy, and selected area electron diffraction confirmed the quality of the synthesized samples. Fourier transform infrared measurements and analysis evidenced that the MFO nanoparticles were attached to the GO surface.

Role for σ38 in prolonged survival of Escherichia coli in Drosophila melanogaster.

Bacteria adapt themselves to host environments by altering the pattern of gene expression. The promoter-recognizing subunit σ of bacterial RNA polymerase plays a major role in the selection of genes to be transcribed. Among seven σ factors of Escherichia coli, σ(38) is responsible for the transcription of genes in the stationary phase and under stressful conditions.

Current status of hematopoietic stem cell transplantations in Vietnam.

In Vietnam, the first three cases of Allo-BMT were successfully performed in 1995 at the Blood Transfusion and Hematology Hospital (BT-H) of Ho Chi Minh City. Donors were HLA fully matched siblings (HLA-A, HLA-B and HLA-DRB1). The patients were a 26-year-old man with CML in chronic phase (CP), a 12-year-old woman with beta-thalassemia/Hb E and a 9-year-old girl with beta-thalassemia/Hb E.