89 research outputs found
津田修二:先天性臍帶ヘルニアに就て 正誤表(第11卷 第3號 綜説欄所載)
The primary 2-DE gel maps at least three biological replicates for control, dehydration treatments (18 h, 24 h and 48 h) and rehydration treatment (R24 h) in Longchun 23. (TIF 1707 kb
Reactor performance and microbial characteristics of CANON process with step-wise increasing of C/N ratio
<p>In this study, the nitrogen removal performance and microbial characteristics of completely autotrophic nitrogen removal over nitrite (CANON) process was investigated with a step-wise increasing of C/N ratio (0.5, 1, 2 and 4) in a membrane bioreactor. The microbial distribution of aerobic ammonia-oxidizing bacteria (AOB) and anaerobic AOB (AAOB) was analysed by fluorescence in situ hybridization (FISH). Results showed that the denitrification ratio rose up correspondingly with the increase of influent C/N, and nitrogen removal rate (NRR) reached the maximum when C/N was 1 due to the harmonious work of denitrification and CANON. However, NRR decreased when influent C/N was more than 2. The threshold C/N ratio of CANON process was 2.2; so the sewage with a high C/N ratio should be pretreated by combining with pre-oxidation of organics or anaerobic-energy-producing process. FISH results showed decreasing numbers of both AOB and AAOB with the addition of organics.</p
Reconstructing Palaeozoic and Mesozoic tectonic evolution of Novaya Zemlya: combing geochronology and thermochronology
Detrital zircon U–Pb LA-ICP-MS data of samples from Novaya Zemlya
Performance and influence factors of completely autotrophic nitrogen removal over nitrite (CANON) process in a biofilter packed with volcanic rocks
<div><p>Completely autotrophic nitrogen removal over nitrite (CANON) process was considered as one of the most efficient and economical nitrogen removal processes, which was suitable for treating wastewater with low ratio of carbon to nitrogen. In this study, an enlarging start-up strategy for CANON process was proposed, and a 40-L CANON reactor was successfully started by seeding 2-L mature biofilm containing both aerobic ammonia-oxidizing bacteria (AerAOB) and anaerobic ammonia-oxidizing bacteria (AnAOB). The effects of dissolved oxygen (DO), ammonia loading rate and the ratio of air inflow to water inflow (<i>Q</i><sub>air</sub>/<i>Q</i><sub>water</sub>) on nitrogen removal performance were investigated. The distribution of AerAOB and AnAOB was analysed using fluorescence in situ hybridization (FISH) technique. The system reached a maximum NRR of 3.11 kg N m<sup>−3</sup> d<sup>−1</sup> with a removal efficiency of 89.5%, and the average value in steady state was 2.42±0.26 and (83.07 ± 6.89)%, respectively. Analysis of influence factors showed the important role of high DO (around 5 mg L<sup>−1</sup>), for the high-rate nitrogen removal, and the <i>Q</i><sub>air</sub>/<i>Q</i><sub>water</sub> should be controlled at 28–40 for stable operation. FISH results suggested that AerAOB and AnAOB predominated in the reactor, with proportions of 46.8% and 39.3%, respectively. This study demonstrated that the biofilter operated with high effluent DO was a feasible setup for CANON process.</p></div
Improving Surface Adsorption via Shape Control of Hematite α‑Fe<sub>2</sub>O<sub>3</sub> Nanoparticles for Sensitive Dopamine Sensors
α-Fe<sub>2</sub>O<sub>3</sub> nanoparticles (NPs) with morphologies
varying from shuttle to drum were synthesized through an anion-assisted
and surfactant-free hydrothermal method by simply varying the ratios
of ethanol and water in solvent. Control experiments show that the
structural evolution can be attributed to a small-molecular-induced
anisotropic growth mechanism in which the growth rate of α-Fe<sub>2</sub>O<sub>3</sub> NPs along the <i>a</i>-, <i>b</i>-, or <i>c</i>-axis was well-controlled. The detailed structural
analysis through the high-resolution transmission electron microscope
(HRTEM) indicated that shuttle-like Fe<sub>2</sub>O<sub>3</sub> NP
surface was covered by high-density atomic steps, which endowed them
with the enhanced adsorption and sensor ability toward dopamine (DA).
The XPS characterizations indicated that the percentages of the O<sub>C</sub> component follow the order of shuttle-like Fe<sub>2</sub>O<sub>3</sub> (S-Fe<sub>2</sub>O<sub>3</sub> for short) > pseudoshuttle-like
Fe<sub>2</sub>O<sub>3</sub> (Ps-Fe<sub>2</sub>O<sub>3</sub> for short)
> polyhedron-like Fe<sub>2</sub>O<sub>3</sub> (Ph-Fe<sub>2</sub>O<sub>3</sub> for short) > drum-like Fe<sub>2</sub>O<sub>3</sub> (D-Fe<sub>2</sub>O<sub>3</sub> for short). Benefits from these structural
advantages,
the S-Fe<sub>2</sub>O<sub>3</sub> NPs–Nafion composite electrode
exhibited remarkable electrochemical detection ability with a wide
liner range from 0.2 μM to 0.107 mM and a low detection limit
of 31.25 nM toward DA in the presence of interferents
Effect of CuO nanoparticles on ammonia removal and EPS secretion of CANON sludge in the presence of nitrite suppression
<p>Completely autotrophic nitrogen removal over nitrite (CANON) process was an innovative technology for nitrogen removal from wastewater. It is necessary to clear the impact of CuO nanoparticles (CuO NPs) on CANON process since the widespread utilize increased their opportunity for entering into wastewater. In this study, the short-term and long-term effects of CuO NPs on the ammonia removal and extracellular polymeric substance (EPS) secretion were analyzed in the presence of nitrite, with the CuO NPs of 0, 5, 10, 20, 50, 100, 200, and 500 mg L<sup>−1</sup>, respectively. Results suggested that low concentration of CuO NPs could enhance the ammonia removal. The inhibition threshold of CuO NPs on CANON sludge within short-term exposure was 20 mg L<sup>−1</sup>, while that of long-term exposure was 10 mg L<sup>−1</sup>. Both short-term and long-term exposure within CuO NPs significantly impacted the ammonia removal, and both the nitrite and CuO NPs influenced the EPS secretion.</p
Additional file 1: of Transcriptomic analyses reveal the underlying pro-malignant functions of PTHR1 for osteosarcoma via activation of Wnt and angiogenesis pathways
PPI network construction. (TSV 148kb
Structural and Electronic Stabilization of PtNi Concave Octahedral Nanoparticles by P Doping for Oxygen Reduction Reaction in Alkaline Electrolytes
The
enhancement in the catalytic activity of PtM (transition metals,
TMs) alloy nanoparticles (NPs) results from the electronic structure
of Pt being modified by the TM. However, the oxidation of the TM would
lead to the electronegativity difference between Pt and TM being much
lowered, which induces a decrease in the number of electrons transferred
from the TM to Pt, resulting in excessive oxygenated species accumulating
on the surface of Pt, thus deteriorating their performance. In this
work, the oxygen reduction reaction (ORR) performance of PtNi (Pt<sub>68</sub>Ni<sub>32</sub>) concave octahedral NPs (CONPs) in alkaline
electrolytes is much improved by doping small amounts of phosphorus.
The P-doped PtNi CONPs (P-PtNi) show about 2 and 10 times enhancement
for ORR compared to PtNi and commercial Pt/C catalysts. The high-angle
annular dark-field scanning transmission electron microscopy and energy-dispersive
X-ray spectroscopy mapping characterizations reveal that the P dopant
uniformly distributes throughout the CONPs, Pt mainly locates at the
edges and corners, whereas Ni situates at the center, forming a P-doped
Pt-frame@Ni quasi-core–shell CONP. The X-ray photoelectron
spectroscopy spectra indicate that the P dopant obviously increases
the electron density of Pt compared with that of PtNi NPs, which contributes
to the stabilization of the electronic structure of PtNi CONPs, thus
restraining the excessive HO<sub>2</sub><sup>–</sup> species
produced on the catalysts, which endow them with a high catalytic
performance in the ORR. In addition, the P attached to the Ni sites
in the PtNi NPs partially prevents the Ni atoms being oxidized by
the external O species, which is conducive to the structural and electrochemical
stability of the PtNi NPs during the ORR. The present results provide
a new insight into the development of ORR catalysts with low utilization
of Pt
Pd-Catalyzed Dimethylation of Tyrosine-Derived Picolinamide for Synthesis of (<i>S</i>)‑<i>N</i>‑Boc-2,6-dimethyltyrosine and Its Analogues
A short and efficient
synthesis of (<i>S</i>)-<i>N</i>-Boc-2,6-dimethyltyrosine
utilizing palladium-catalyzed
directed C–H functionalization is described. This represents
the first general method for the <i>ortho</i>-dimethylation
of tyrosine derivatives and offers a practical approach for preparing
this synthetically important building block. Notably, throughout the
reaction sequence no racemization occurs at the susceptible α-chiral
centers
- …