Ethanol vapor-mediated maturing for the enhancement of structural regularity of hexagonal mesoporous silica films.

Structural regularity of hexagonal mesoporous silica films is dramatically enhanced when allowed to stand for a few hours in an ethanol vapor-containing closed bottle before dryness.

Tetrafluoroborate salts as site-selective promoters for sol-gel synthesis of mesoporous silica.

Tetrafluoroborate ion (BF(4)(-)) serves as a powerful and better-behaved promoter than fluoride ion (F(-)) for hydrolytic condensation of alkoxysilanes, such as tetraethoxy orthosilicate, in aqueous media containing amphiphiles with onium ion headgroups as templates, affording thermally and hydrothermally stable mesoporous silica. According to (19)F NMR spectral profiles, BF(4)(-) is localized on a positive-charged micellar surface, thereby allowing a site-selective growth of the silica framework. The resulting porous silica has an ordered hexagonal structure with a well-developed and thick silicate wall.

A condensable amphiphile with a cleavable tail as a "Lizard" template for the sol-gel synthesis of functionalized mesoporous silica.

Use of a dialkoxysilane-containing, condensable alanine amphiphile with a cleavable hexadecyl ester tail (1) as a "lizard" template for sol-gel synthesis results in the formation of a mesoporous silicate (2) whose channels are filled with an organic group of the template. Treatment of 2 with aqueous HCl allows selective cleavage of the ester moiety to leave nanochannels (3) whose surface is densely covered with alanine-CO2H. According to XRD and TEM, 2, on conversion into 3, can preserve its regular hexagonal structure.

Functional disturbance of biliary indocyanine green excretion in rat cerulein pancreatitis followed by endotoxemia: role of the prime and the second attack.

Context: Hepatic injury is considered one of the critical complications associated with acute pancreatitis. It was proposed that initial insults to the liver in the early phase of the attack have an important priming effect, and the subsequent infectious attack (e.g.

Dynamic aspects of granulocyte activation in rat severe acute pancreatitis.

We demonstrated dynamic aspects of granulocyte activation in rat severe acute pancreatitis, which was induced by cerulein and aggravated following lipopolysaccharide (LPS) injection. Pancreatitis induced by cerulein increased intracellular elastase activity of granulocytes in the blood. However, significant systemic cytokinemia was not provoked under such conditions.