The carbene complex 5-(2,2-dimethyl-2H-chromene)methoxylmethylene chromium pentacarbonyl will undergo a benzannulation reaction with phenylacetylene, 1-pentyne, 3-hexyne, and trimethylsilylacetylene to give 7-hydroxy-10-methoxy-3H-naphtho[2.1-b]pyrans as the primary product. These compounds are difficult to obtain pure due to their sensitivity to air. If the benzannulation reaction is performed...

INTRODUCTION The present study was designed to compare two methods of vitamin D supplementation in infants: every two months as a routine vaccination versus a daily dose. METHODS A randomised clinical trial was performed on 120 healthy breastfed infants between January and September 2007 in Yazd, Iran. The infants were randomly divided into three groups with different doses of vitamin D3 supp...

Involvement of biofilm or microorganisms in corrosion processes is widely acknowledged. Although majority of the studies on microbiologically induced corrosion (MIC) have concentrated on aerobic/anaerobic bacteria. There are numerous aerobic bacteria, which could hinder the corrosion process. The microbiologically produced exopolymers provide the structural frame work for the biofilm. These pol...

Heliotropium glutinosum Phil. (Heliotropiceae) is a resinous bush that grows at a height of 2000 m in Chañaral, Chile. From the resinous exudates of Heliotropium glutinosum Phil. a new aromatic geranyl derivative: 4-methoxy-3-[(2)-7'-methyl-3'-hydroxymethyl-2',6'-octadienyl] phenol (1) and three flavonoids: 5,3'-dihydroxy-7,4'-dimethoxyflavanone (2), 5,4'-dihydroxy-7-methoxyflavanone (3) and 4'...

OBJECTIVE To investigate the relationship between Vitamin D deficiency and acute otitis media infection. METHODS The randomised, single-blind, case-control study was conducted at the Paediatric Department of Ataturk University, Erzurum, Turkey, from January to April 2010. It comprised ambulatory children diagnosed with acute otitis media and healthy controls. The subjects were divided into gr...

2'-Deoxynucleoside conjugates of 13α-estrone were synthesized by applying the copper-catalyzed alkyne-azide click reaction (CuAAC). For the introduction of the azido group the 5'-position of the nucleosides and a propargyl ether functional group on the 3-hydroxy group of 13α-estrone were chosen. The best yields were realized in our hands when the 3'-hydroxy groups of the nucleosides were protec...

The carcinogenic activities of s.c. administered N-hydroxy-2-acetylaminofluorene (N-hydroxy-AAF) and a variety of its metal chelates were investigated with reference to the time of exposure of the tissue to the compounds. No tumors were obtained at the sites of 4 injections of N-hydroxy-AAF (3.2 mg/injection), but 4 and 16 of 20 rats developed sarcomas at the sites of 8 and 16 injections, respe...

We prepared an oligodeoxynucleotide (ODN) bearing two 4-hydroxy-2-mercaptobenzimidazole nucleobase analogues (SB(NV) and SB(NB)) modified with different photolabile groups. This ODN enabled a light-triggered strand exchange reaction in a wavelength-selective manner.