Propargyl 1,2-O-orthoesters are exploited for the synthesis of 1,2-trans O-glycosides of protected amino acids. N-Fmoc- and N-Cbz protected serine/threonine - benzyl/methyl esters reacted well with glucosyl-, galactosyl-, mannosyl- and lactosyl- derived propargyl 1,2-orthoesters affording respective 1,2-trans glycosides in good yields under AuBr(3)/4 Å MS Powder/CH(2)Cl(2)/rt. t-Boc serine deri...

In a multi-node spacecraft or unmanned aerial vehicle (UAV) group, multifunctional signal containing measurement, navigation, and communication functions is required to simplify the receiver structure, increase spectrum utilization. The paper proposes based on binary offset carrier (BOC) phase shift keying (BPSK) modulation. signals which carry different are orthogonal in frequency domain, caus...

The argon isotopic compositions of chondrule-forming minerals the Allende (CV3) meteorite were examined to evaluate possibility in situ 40Ar/39Ar dating planetary surface rocks based on cosmogenic 39Ar without neutron irradiation a reactor. investigated sample (ME-247H: 50 mm × 45 5 mm; 28.85 g) contains at least three textural types chondrules: barred olivine chondrule (BOC), porphyritic (POC)...

A chiral bisguanidinium macrocycle binds N-Boc-L-glutamate in a 1 : 1 stoichiometry with significant selectivity in competitive solvent (DMSO-H(2)O).

The Bi2O2CO3 (BOC) samples were successfully synthesized by a microwave-assisted method at different microwave powers and lengths of irradiation time. as-synthesized characterized X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), transmission (TEM), photoluminescence (PL) UV–visible spectroscopy. analytical results demonstrated that the...

Direct-acting antiviral (DAA) therapies have revolutionised the treatment of hepatitis C virus (HCV). The financial cost of DAAs however is significant, and first generation protease inhibitors (PIs) also require frequent monitoring of viral RNA levels to guide treatment. In this context, we examined the relevance of HCV antigen testing to evaluate the potential role in monitoring virological r...

Treatment of Boc-protected (S)-serine (Ser) methyl ester with triphenylphosphine bromide Ph(3)PBr (intermittently generated from PPh(3) and N-bromosuccinimide) yields Boc-3-bromoalanine (R)-Boc-BrAlaMe and, after deprotection, bromoalanine methyl ester (R)-BrAlaMe in the form of its hydrobromide. Boc-BrAlaMe and BrAlaMe have been structurally characterised. The reaction between BrAlaMe, salicyl...

Galileo will be Europe’s own Global Navigation Satellite System (GNSS), which is aiming to provide highly accurate and guaranteed positioning services. Among several services for separate target groups, Galileo Open Services (OS) are designed for mass-markets, and they will be available worldwide and free of charge for all users. Galileo E1 system has a code period of 4ms which is quadruple tha...