A practical synthesis of 1-bromo-2-amino-3-butene derivatives from homoallylic trichloroacetimidates was reported. Simply heating the mixture of substrates and N-bromoacetamide in DMF at 90 °C would give the desired products in moderate to excellent yields. The reaction may proceed through a domino bromo-cyclization and elimination pathway. The synthesis of 4,5-dihydrooxazoles from 1-bromo-2-am...

We performed ultrafast pump-probe spectroscopy of J-aggregates of 3,3'-disulfopropyl-5,5'-dichloro-9-ethyl thiacarbocyanine triethylammonium (THIATS), one of the most typical cyanine dyes, and detected excited molecular vibrations, using a sub-10 fs pulse laser. The time-resolved two-dimensional difference absorption (ΔA) spectra are observed between -314 and 1267 fs. By performing the Fourier ...

Objective: This study aimed to evaluate whether platelet indices and leukocyte count predict the diagnosis of Ethylene Diamine Tetra Acetic Acid induced pseudothrombocytopenia (EDTA-PTCP) differ this entity from immune thrombocytopenia (ITP). Methods: One-hundred sixty-nine individuals (52 patients diagnosed with EDTA-PTCP, 52 newly ITP, 65 healthy individuals) were included. Demographic data c...

A field study was conducted to evaluate tolerance of pecan rootstocks soil salinity and sodicity. Seven cultivars—Elliott, Giles, Ideal, Peruque, Riverside, ‘Shoshoni, VC1-68—were selected from a range geographic regions origin. The the experimental plot poorly drained, saline–sodic Pima silty clay variant. irrigation water moderately saline mix Gila River local groundwater with an electrical c...

Tims Branch, a stream on the U.S. Department of Energy’s Savannah River Site located near Aiken, South Carolina, received significant amounts U and Ni as a result of nuclear materials production and refinement. Batch and column experiments were used to evaluate potential remediation scenarios and the migration hazard of U and Ni from flood-plain sediments collected along Tims Branch. Treatment ...

A pot experiment was carried out to study the single and sequential extractions of metals in different tannery sludge amendment and the potential of the plant of Sesamum indicum L. var. T55 (sesame) for the removal of metals from tannery waste contaminated site. The metal extraction efficiency obtained with each extractants was slightly different and follow the order; EDTA>DTPA>NH(4)NO(3)>NaNO(...

A piridina-2-carbaldeído-2-(4-metil-1,3-benzotiazol-2-il) hidrazona (PCMHT) pode ser usada como um ionóforo neutro apropriado à preparação de uma membrana sensora a Er(III), com alta seletividade. A composição ótima encontrada foi PCMHT-PVC-KTpClPB-BA com as razões de 6,0:30,0:5,0:59,0, respectivamente. A resposta Nernstiniana foi de 21,8 ± 0,5 mV década para a atividade de Er(III). O intervalo...

During the last few years, the Ca 2+-channels in isolated smooth muscle cells have been intensively studied (Walsh and Singer 1981; Bury et al. 1982; Klock­ ner and Isenberg 1985; Droogmans and Callewaert 1986). It was shown that under physiological conditions Ca 2+-channels are not measurably permeable for Na-ions (Klockner and Isenberg 1985). On the other hand, inward currents carried by Na +...

The effect of oxidative stress catalysed by transition metals appears to have a critical relevance for the structure and function not only of membrane lipids but also of integral membrane proteins in a complex lipid-protein assembling, and membrane-dependent function. The integral membrane enzyme 5'-nucleotidase is susceptible to Fe((2+))-ion catalysed oxidative modification, and the extent of ...