Transition Behaviors of Isostructural Hydrogen-Bonded Frameworks Composed of Naphthalene, Quinoxaline, and Pyrazinopyrazine Derivatives.

A series of isostructural reticular frameworks with systematic differences on chemical structures allows us to disclose correlations between specific structural factors and properties, providing insights for designing novel porous materials. However, even slight differences in the molecular structure often result in formation of non-isostructural polymorphic frameworks particularly in the case of hydrogen-bonded organic frameworks (HOFs) because the structures of HOFs are based on a subtle balance of reversible interactions. In this study, we found that three simple analogues of tetracarboxylic acids with naphthalene, quinoxaline, and pyrazinopyrazine cores (NT, QX, and PP, respectively) yielded isostructural solvated HOFs (NT-1, QX-1, and PP-1, respectively), where hydrogen-bonded sql-networked sheets were slip-stacked with closely similar manners. These isostructural HOFs underwent structural transformations in different manners upon removal of the guest solvents. Comparison of the crystal structures of the HOFs before and after the transformation revealed that intermolecular interactions of the core significantly affected on rearrangements of hydrogen bonds in the transformation. The results suggest the potential to control the properties and functions of isostructural HOFs by elemental doping.

[Foreign Body in Chest Wall with Traumatic Pneumothorax Caused by Fang of Wild Boar].

We report a case of foreign body in chest wall with traumatic pneumothorax caused by fang of wild boar performed video-assisted thoracic surgery. The patient was a 69-year-old woman. She was attacked from behind by a wild boar during farm work. She was transferred to the emergency and critical care center of our hospital. She was in a state of hemorrhagic shock when arrived with multiple bite wounds on her back. Computed tomography( CT) scan revealed left pneumothorax and a foreign body in chest wall suspected to be a wild boar fang. Thoracoscopic surgery was performed to remove the foreign body.

Quasi single-crystalline transformation of porous frameworks accompanied by interlayer rearrangements of hydrogen bonds.

Quasi single-crystal-to-single-crystal transformation of a hydrogen-bonded organic framework (HOF) was accurately revealed and the mechanism was proposed. Interestingly, Br/π interaction allows a snapshot of the intermediate phase of the crystal structure to be solved.

Effects of aroma components from oxidized olive oil on preference.

The present study explored the possibility that aroma components generated by the oxidation of olive oil may enhance the palatability of olive oil. Using a mouse behavioral model, we found that olive oil oxidized at room temperature for 3 weeks after opening the package, and heated olive oil were both significantly preferred over non-oxidized olive oil. Furthermore, this preference was enhanced with an additive of oxidized refined olive oil flavoring preparation at a certain concentration. These results suggest that the aroma of oxidized fat might be present in most fats, and might act as a signal that makes possible the detection of fats or fatty acid sources.

Bioconversion of 1-adamantanol to 1,3-adamantanediol using Streptomyces sp. SA8 oxidation system.

To efficiently produce 1,3-adamantanediol (1,3-ad(OH)(2)) from 1-adamantanol (1-adOH), our stocks of culture strains and soil microorganisms were surveyed for hydroxylation activity towards 1-adOH. Among them, the soil actinomycete SA8 showing the highest hydroxylation activity was identified as Streptomyces sp. based on 16S ribosomal DNA sequence analysis. The reaction products were purified by silica gel column chromatography, and from NMR and MS analyses, they were identified as 1,3-ad(OH)(2) and 1,4-ad(OH)(2). Streptomyces sp. SA8 produced 5.9 g l(-1) 1,3-ad(OH)(2)from 6.2 g l(-1) 1-adOH in culture broth after 120 h at 25 degrees C. Using resting cells, 2.3 g l(-1) 1,3-ad(OH)(2) was produced after 96 h of incubation at a 69% conversion rate. In both cases, 1,4-ad(OH)(2) was formed as a byproduct at a rate of about 15%. Strain SA8 also hydroxylated 2-adamantanol and 2-methyl-2-adamantanol.