Carboxylation of Acetylene without Salt Waste: Green Synthesis of C Chemicals Enabled by a CO -Pressure Induced Acidity Switch.

The inherent formation of salt waste in C-H carboxylations is a key obstacle precluding the utilization of CO as C building block in the industrial synthesis of base chemicals. This challenge is addressed in a circular process for the production of the C base chemical dimethyl succinate from CO and acetylene. At moderate CO pressures, acetylene is doubly carboxylated in the presence of cesium carbonate.

Iron-Catalyzed Decarboxylation of Trifluoroacetate and Its Application to the Synthesis of Trifluoromethyl Thioethers.

Nucleophilic CF3 has been generated by decarboxylation of potassium trifluoroacetate, arguably the most easy-to-handle, inexpensive, and sustainable source of trifluoromethyl groups. Simple iron(II) chloride catalyzes the decarboxylation as well as a subsequent trifluoromethylation of organothiocyanates, resulting in a straightforward synthesis of trifluoromethyl thioethers. The KCN byproduct is absorbed by iron(II) with formation of nontoxic potassium hexacyanoferrate.

Synergistic interaction between atovaquone and retinol in Plasmodium falciparum in vitro.

The study has been conducted with the objective of assessing the blood schizontocidal activities of atovaquone (ATO), retinol (RET) and combinations of both (ATO-RET) at set retinol concentrations corresponding to the 50th, 65th and 80th percentile of the physiological serum retinol levels. The in vitro tests followed the WHO standard protocol Mark II for measuring the inhibition of schizont maturation in Plasmodium falciparum. Valid results for all 5 test lines were obtained with 26 fresh parasite isolates from northwestern Thailand, an area affected by multidrug-resistance.

WOFIE stimulates regulatory T cells: a 2-year follow-up of renal transplant recipients.

Background: Initial interruption of immunosuppression for 72 hr was analyzed in renal transplant recipients according to Calne et al.'s "window of opportunity for immunologic engagement" (WOFIE) concept.

Methods: This pilot study was designed as a randomized, open-label, prospective trial of 40 recipients (20 in the WOFIE group, 20 in the control group) of cadaveric kidney transplants who were followed up for 2 years.

CD45 congenic bone marrow transplantation: evidence for T cell-mediated immunity.

CD45 congenic mice have been used to study stem cell engraftment in the absence of alloreactivity. Recently, impaired engraftment was reported in this model and attributed to weak immune reactivity. We have confirmed that there is indeed low-level reactivity mediated by CD8(+) cells and alpha beta-TCR(+) T cells.