Postsynthetic Modification (postsynthetic + modification)

Distribution by Scientific Domains

Selected Abstracts

Generating Reactive MILs: Isocyanate- and Isothiocyanate-Bearing MILs through Postsynthetic Modification,

Christophe Volkringer Dr.
Reaktive MOFs: Robuste Metall-organische Al-basierte Gerüststrukturen (MIL-53(Al)-NH2) können mit Phosgenreagentien nach der Synthese modifiziert werden. Dabei entstehen hoch reaktive poröse Materialien mit Isocyanat- oder Isothiocyanatgruppen (siehe Schema). [source]

Engineering a Metal,Organic Framework Catalyst by Using Postsynthetic Modification,

MOF+PSM=Kat.: Ein hochporöses Metall-organisches Gerüst (MOF) wird mithilfe einer Postsynthesemodifikation (PSM) metalliert und in einen aktiven, robusten, wiederverwendbaren Katalysator (Kat.) überführt. [source]

ChemInform Abstract: Postsynthetic Modification Switches an Achiral Framework to Catalytically Active Homochiral Metal,Organic Porous Materials.

CHEMINFORM, Issue 45 2009
Mainak Banerjee
Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a "Full Text" option. The original article is trackable via the "References" option. [source]

Differential expression of nitric oxide synthases in human scalp epidermal and hair follicle pigmentary units: implications for regulation of melanogenesis

H.M. Sowden
Summary Background, Nitric oxide (NO) is a ubiquitous gaseous lipophilic molecule generated from the conversion of l -arginine to l -citrulline by the NO synthases (NOSs). Ultraviolet radiation (UVR)-induced NO production appears to stimulate epidermal melanogenesis. However, given their relative protection from UVR, it is unclear whether NO plays a similar role in hair bulb melanocytes. Objectives, We aimed to identify the expression profiles of the NOS isoforms endothelial NOS (eNOS), neuronal NOS (nNOS) and inducible NOS (iNOS) and of phosphorylated eNOS and nitrotyrosine within the epidermal and follicular melanin units of normal human haired scalp during the hair growth cycle. Methods, This study employed single and double immunohistochemical and immunofluorescence staining techniques using haired scalp from 10 healthy individuals (six women and four men). Results, Melanocytes in the basal layer of the epidermis expressed eNOS, nNOS and nitrotyrosine. By contrast, melanogenically active melanocytes of the anagen hair bulb were wholly negative for these markers. However, other follicular melanocytes not actively involved in pigment production, including undifferentiated melanocytes located in the outer root sheath and melanocytes surviving the apoptosis-driven hair follicle (HF) regression during catagen/telogen, expressed eNOS, nNOS and nitrotyrosine. While iNOS was only weakly expressed in the basal layer of the human epidermis, it was highly expressed in keratinocytes of the inner root sheath (IRS), where it colocalized with trichohyalin, a differentiation-associated protein of the IRS that requires enzyme-catalysed conversion of arginine to citrulline. Conclusions, The NOS isoforms and nitrotyrosine are differentially expressed in different cutaneous melanocyte subpopulations. Results of this study suggest a possible role for eNOS, nNOS, iNOS and nitrotyrosine in melanocyte biology, particularly with respect to melanogenesis and melanocyte survival during HF regression. Another example of possible NO involvement in HF biology is the postsynthetic modification of trichohyalin in differentiating keratinocytes of the IRS. These results suggest that NO may influence several aspects of HF biology. [source]