好アルカリ性Bacillus A-007株のK^+ : 促進ATPaseについて

1.好アルカリ性Bacillus A-007株の生育にとってK^+は必須であった.2.K^+-濃度を制限した培地(1.5mMK^+)で生育させた細胞の膜画分に, K^+により促進されるATPase活性が認められた.3.K^+促進ATPaseは, 動力学的特性及びウワバイン, NaN_3, PCMBに対する感受件において, 同菌株のH^+-ATPaseと明らかに異なっていた.1. K^+ was essential for the growth of an alkalophilic Bacillus A-007. 2. Membrane fraction, which was prepared from the cells grown in K^+ -limited medium (1.5mM K^+), showed K^+ -stimulated ATPase activity. 3. The K^+ -stimulated ATPase was clearly different from H^+ -ATPase on kinetical profile and ouabain-, NaN_3- and PCMB-sensvtivity

Kinetics-Driven Crystal Facets Evolution at the Tip of Nanowires: A New Implementation of the Ostwald-Lussac Law

Nanocrystal facets evolution is critical for designing nanomaterial morphology and controlling their properties. In this work, we report a unique high-energy crystal facets evolution phenomenon at the tips of wurtzite zinc oxide nanowires (NWs). As the zinc vapor supersaturation decreased at the NW deposition region, the NW tip facets evolved from the (0001) surface to the {101̅3} surface and subsequently to the {112̅2} surface and eventually back to the flat (0001) surface. A series of NW tip morphology was observed in accordance to the different combinations of exposed facets. Exposure of the high-energy facets was attributed to the fluctuation of the energy barriers for the formation of different crystal facets during the layer-by-layer growth of the NW tip. The energy barrier differences between these crystal facets were quantified from the surface area ratios as a function of supersaturation. On the basis of the experimental observation and kinetics analysis, we argue that at appropriate deposition conditions exposure of the crystal facets at NW growth front is not merely determined by the surface energy. Instead, the NW may choose to expose the facets with minimal formation energy barrier, which can be determined by the Ehrlich–Schwoebel barrier variation. This empirical law for the NW tip facet formation was in analogy to the Ostwald–Lussac law of phase transformation, which brings a new insight toward nanostructure design and controlled synthesis

Structural Diversity and Properties of M(II) Coordination Compounds Constructed by 3‑Hydrazino-4-amino-1,2,4-triazole Dihydrochloride as Starting Material

Twelve metal coordination compounds with two triazole derivatives, namely, {[Mn­(HATr)₂]­(ClO₄)₂}_<i>n</i> (<b>1</b>), [Mn­(HATr)₃]­Cl­(ClO₄) (<b>2</b>), [Co₃(ATr)₆­(H₂O)₆]­(ClO₄)₆·4.5H₂O (<b>3</b>), [Co­(HATr)₃]­Cl­(ClO₄) (<b>4</b>), [Co₂Cl₂(HATr)₂­(H₂O)₂(CH₃OH)₂]­Cl₂·2H₂O (<b>5</b>), [Ni₃(ATr)₆­(H₂O)₆]­(ClO₄)₆·4.5H₂O (<b>6</b>), [Ni­(HATr)₃]­Cl­(ClO₄) (<b>7</b>), [Ni₂Cl₂(HATr)₂­(H₂O)₄]­(ClO₄)₂·4H₂O (<b>8</b>), [Ni₂(HATr)₂­(H₂O)₆]­(ClO₄)₄·2H₂O (<b>9</b>), {[Zn­(HATr)₂]­(ClO₄)₂}_<i>n</i> (<b>10</b>), [Zn­(HATr)₃]­Cl­(ClO₄) (<b>11</b>), and {[Cd₄(HATr)₈]­(CdCl₄)­Cl₂(ClO₄)₄}_<i>n</i> (<b>12</b>), when HATr = 3-hydrazino-4-amino-1,2,4-triazole and ATr = 4-amino-1,2,4-triazole, were prepared under diverse conditions and structurally characterized. Compounds <b>1</b>, <b>10</b> and <b>12</b> exhibit one-dimensional zigzag chain structures; <b>2</b>, <b>4</b>, <b>7</b>, and <b>11</b> possess mononuclear structures; <b>3</b> and <b>6</b> display trinuclear structures, while <b>5</b>, <b>8</b>, and <b>9</b> feature binuclear structures. Hydrogen bonds link these compounds into three-dimensional structures. The thermal stability and energetic properties also were determined

Evolution of Hollow TiO₂ Nanostructures via the Kirkendall Effect Driven by Cation Exchange with Enhanced Photoelectrochemical Performance

Hollow nanostructures are promising building blocks for electrode scaffolds and catalyst carriers in energy-related systems. In this paper, we report a discovery of hollow TiO₂ nanostructure evolution in a vapor–solid deposition system. By introducing TiCl₄ vapor pulses to ZnO nanowire templates, we obtained TiO₂ tubular nanostructures with well-preserved dimensions and morphology. This process involved the cation exchange reaction between TiCl₄ vapor and ZnO solid and the diffusion of reactants and products in their vapor or solid phases, which was likely a manifestation of the Kirkendall effect. The characteristic morphologies and the evolution phenomena of the hollow nanostructures from this vapor–solid system were in a good agreement with the Kirkendall effect discovered in solution systems. Complex hollow TiO₂ nanostructures were successfully acquired by replicating various ZnO nanomorphologies, suggesting that this unique cation exchange process could also be a versatile tool for nanostructure replication in vapor–solid growth systems. The evolution of TiO₂ nanotubes from ZnO NW scaffolds was seamlessly integrated with TiO₂ NR branch growth and thus realized a pure TiO₂-phased 3D NW architecture. Because of the significantly enlarged surface area and the trace amount of Zn left in the TiO₂ crystals, such 3D TiO₂ nanoforests demonstrated enhanced photoelectrochemical performance particularly under AM (air mass) 1.5G illumination, offering a new route for hierarchical functional nanomaterial assembly and application

A Novel Process for the Key Intermediate of Fluoroquinolones

A Novel Process for the Key Intermediate of Fluoroquinolone

Plot illustrates findings from meta-analysis of the association between HIF-1α overexpression and tumor vascular invasion in 7 trials.

<p>Each study was shown by the name of the first author and the OR with 95% CIs. The summary OR and 95% CIs were also shown (according to the random effect estimations).</p

Flow diagram indicating the process of selecting articles for meta-analysis.

<p>Flow diagram indicating the process of selecting articles for meta-analysis.</p

Plot illustrates findings from meta-analysis of the association between HIF-1α overexpression and overall survival (OS) in 7 trials.

<p>Each study was shown by the name of the first author and the HR with 95% CIs. The summary HR and 95% CIs were also shown (according to the fixed effect estimations).</p

Funnel plot for hazard ratios of recessive model in OS studies.

<p>Funnel plot for hazard ratios of recessive model in OS studies.</p

Plot illustrates findings from meta-analysis of the association between HIF-1α overexpression and disease free survival (DFS) in 7 trials.

<p>Each study was shown by the name of the first author and the HR with 95% CIs. The summary HR and 95% CIs were also shown (according to the fixed effect estimations).</p