Peralkylated cyclopentadiene systems of the type Me,C,(CH,),Si(Me),Y,_,, which possess cyclopentadiene units connected with a functionalized silane fragment by an alkylidene spacer group, are prepared via two routes. As an example of the first route, the disiloxane [Me,C,(CH,),Si(Me),],O (2) has been synthesized from the corresponding iodo compound [I(CI-Iz),Si(Me),],O (1) by reaction with Me&K...

background: beta thalassemia is a common inherited disease, resulting from one or more of 200 different mutations in the beta-globin gene. qazvin province has attracted migrations of several different populations due to industrialization during the past five decades. the aim of this study was to define the molecular spectrum of beta-thalassemia mutations in qazvin province.   methods: ethylen d...

conclusions despite of high resistance of p. aeruginosa, the resistance rate of p. aeruginosa strains isolated from children in the current study was not high. then accurate prescription of antibiotics can decrease the speed of resistance creation. background the first report of pseudomonas aeruginosa (p. aeruginosa) carbapenem resistant strains, and especially the metallo-beta-lactam (mbl) pro...

background: the risk of multiple pregnancies often present in programs of in vitro fertilization (ivf) is an important force for embryo cryopreservation. on the other hand ethical restriction and assurance of potential fertility following chemo/radio therapy has led scientists to focus on female gamete preservation. objective: optimizing vitrification protocol by using less concentrated cryopro...

Luftfahrt ist besonders klimaschädlich, hat aber das Emissionsziel netto Null bis 2050. Die Einführung neuer Antriebe eine technische Herausforderung. Doch die bestehende Flugzeugflotte ließe sich durch synthetisch hergestelltes Kerosin nachhaltiger machen. Dieses Drop-in-Kerosin lässt aus verschiedenen Ausgangsstoffen über unterschiedliche Synthesepfade herstellen. Im Kern drehen sie meist um ...