Dehydrohalogenation of 5,6-dihalogen-1,3-dioxepanes II with KOH/MeOH or NaOCH3/MeOH under controlled reaction conditions gave mainly 5-halogen-4,7-dihydro-1,3-dioxepines III. Further substitution of vinylic-bromine in III whit KO-t-Bu/tert-BuOH or KOH/MeOH led to corresponding 5-substituted-4,7-dihydro-1 ,3-dioxepines some of which underwent spontaneous isomerization to 6,7-dihydro-1,3-dioxepin...

Background: One of the key techniques for the preparation of 125I seeds is adsorption of 125I onto silver bits coated by palladium (pd). Carriers played an important role in the adsorption of 125I on palladium. KI is used as a carrier for fixing of 125I onto silver wire bits coated with palladium. Materials and Methods: Three procedures KI, KOH, NH4OH were investigated for adsorption of ...

background: one of the key techniques for the preparation of 125i seeds is adsorption of 125i onto silver bits coated by palladium (pd). carriers played an important role in the adsorption of 125i on palladium. ki is used as a carrier for fixing of 125i onto silver wire bits coated with palladium. materials and methods: three procedures ki, koh, nh4oh were investigated for adsorption of 125i ac...

Surface texturing is demonstrated by the combination of wet etching and ultrafast laser nanostructuring of silica glass. Using potassium hydroxide (KOH) at room temperature as an etchant of laser modified glass, we show the polarization dependent linear increase in retardance reaching a threefold value within 25 hours. The dispersion control of birefringence by the etching procedure led to achr...

Etching of crystalline silicon by potassium hydroxide (KOH) etchant with temperature variation has been studied. Results presented here are temperature dependent ER (etch rate) along the crystallographic orientations. Etching and activation energy are found to be consistently favorable with the thermal agitation for a given crystal plane. Study demonstrates that the contribution of microscopic ...

Sialoglycoconjugates were investigated in the bovine sublingual gland by direct visualization of sialic acid with specific lectins (LPA, SNA) and by histochemical procedures combined with sialidase digestion and lectins. The most reactive histological structures were found to be acini which contained glycoconjugates with terminal disaccharides consisting of sialic acid linked to galactose or N-...

Accuracy of the automated fluorometric measurement of triglyceride by the technique of Kessler and Lederer is limited by the instability of the baseline. Concentration of the alcoholic KOH reagent was modified, and the pump tube manifold altered to provide on-stream mixing of the KOH reagent, which overcame this difficulty. A relatively inexpensive fluorometer with the solid-state photomultipli...

The percentage of positivity of combined PAS and culture was 79 (56%) and combined KOH and culture was 64 (45.4%), (Table 2). Comparing PAS test alone as an alternative method of diagnosis to combined KOH and culture (for both culture positive and culture negative cases) showed an overall sensitivity of 60.9% and specificity of 80.3%. When applied specifically to dermatophyte culture positive c...

Hierarchical ZSM-5 zeolite is hydrothermally synthesized in a single step with cetyltrimethylammonium (CTA) hydroxide acting as mesoporogen and structure-directing agent. Essential to this synthesis is the replacement of NaOH with KOH. An in-depth solid-state NMR study reveals that, after early electrostatic interaction between condensed silica and the head group of CTA, ZSM-5 crystallizes arou...