The dimeric AraC protein of Escherichia coli binds specifically to DNA sequences upstream of promoters whose transcription is regulated by arabinose. Here we show with affinity measurements, DNase footprinting, dimethyl sulfate premethylation interference and dimethyl sulfate footprinting studies that AraC protein can recognize paired half-sites in direct repeat orientation or inverted repeat o...

cobalt hydrogensulfate is an efficient catalyst for the condensation of β-naphthol, aromatic aldehydes and 5,5-dimethyl-1,3-cyclohexanedione at 120 °c to afford 9,9-dimethyl-12-phenyl-8,10,11,12-tetrahydro-9-h-benzo[a]xanthen-11-one derivatives in high yields. also, polycondensation reactions of phenols with phthalic anhydride were carried out in the presence of cobalt hydrogensulphate under so...

Background : The historical evidence of the use of “general spinal anesthesia” introduced by Thomas Jonnesco in 1909 for the surgeries of the skull, head, neck and thorax puncturing the subarachnoid space (SAS) between 1 and 2 thoracic vertebra producing perfect and deep analgesia for the above mentioned area influenced to puncture SAS at 10 thoracic vertebra (T10) in place of puncturing SAS be...

Friend erythroleukemic cells can be induced to differentiate by chemicals such as dimethyl sulfoxide and hexamethylene bisacetamide (HMBA) in a dose-dependent manner. Others have shown that dexamethasone and other steroid hormones can inhibit the differentiation induced by dimethyl sulfoxide. We show here that dexamethasone has a dual mode of action on the HMBA-induced differentiation of a Frie...

Friend erythroleukemic cells can be induced to differentiate by chemicals such as dimethyl sulfoxide and hexamethylene bisacetamide (HMBA) in a dose-dependent manner. Others have shown that dexamethasone and other steroid hormones can inhibit the differentiation induced by dimethyl sulfoxide. We show here that dexamethasone has a dual mode of action on the HMBA-induced differentiation of a Frie...

Since a satisfactory procedure of preparing pure protoporphyrin IX dimethyl ester from hemoglobin (1) has been worked out, it is interesting to investigate direct reduction of protoporphyrin IX dimethyl ester into mesoporphyrin IX dimethyl ester. Although these compounds, the melting points of which are too close to be of use for their differentiation, can be distinguished by HCl number (2) or ...