ÖZ E T Bu çalışmada tetrazolyum tuzları ve formazanların yapıları tanımlanmıştır. Ayrıca formazan-tetrazolyum sistemlerinin önemi ve kullanım alanları açıklanmıştır. Formazanların sahip oldukları conjugate p-system kaynaklanan tautomerleşme özellikleri ve geometrik izomerleri incelenmiştir. Bu bileşiklerin en yaygın kullanılan sentezleri ve yapılarının açıklanmasında önemli olan UV-visible, IR ...

T, . etrazolium stains permit the histochemical demonstration of dehydrogenase enzymes in tissue sections. These stains are soluble compounds which act as hydrogen acceptors developing insoluble formazan precipitates in the reduced state. Blue tetrazolium was first used by DeBerardinis to study frozen corneal tissue sections and subsequently has been used by Kuwabara and Cogan, who studied the ...

A new method is described for measuring the mean transit time (MTT) of digesta through the human gut in which a constant amount of marker (radio-opaque pellets) is fed to subjects with each meal over a period of weeks, and its excretion measured in the stools. The MTT measured by this method (MTT-C) has been compared with MTT measured by giving single doses of similar markers to the same subjec...

There is a certain consensus on some defining features of collocations (they are frequent, recurrent, conventional, institutionalized, etc.), but there is not much agreement on other characteristics, for example whether or not they constitute binary lexical relations, and — crucially— whether they are arbitrary, and must be stipulated, or should instead be deduced or inferred. I will argue that...

Presents remarks from the MTTS Ombudsman.

An in-depth investigation of a multi-mode reconfigurable aperture controlled by pin diode switches is presented. A method for reducing the coupling across the pin diode switches is explored, yielding a noticeable improvement in the isolation characteristics between ports. Strategic feeding of the patch antenna ports results in significantly improved radiation patterns, making the system suitabl...