One new homoisoflavonoid, (3E)-2,3-dihydro-6,7-dimethoxy-3[(3-hydroxy-4-methoxyphenyl)methylene]-4H-1-benzopyran-4-one and four naturally new analogues, (3E)-3-(1,3-benzodioxol-5-ylmethylene)-2,3-dihydro-7-hydroxy-4H-1-benzopyran-4-one, (3E)-3-(1,3-benzodioxol-5-ylmethylene)-2,3-dihydro-7-methoxy-4H-1-benzopyran-4-one, (3E)-2,3-dihydro-7-hydroxy-3-[(3-hydroxy-4-methoxyphenyl)methylene]-4H-1-ben...

The use of small, natural chemical reporters in conjunction with catalyst-free bioorthogonal reactions will greatly streamline protein labeling in a cellular environment with minimum perturbation to their function. Here we report the discovery of a 2-cyanobenzothiazole (CBT)-reactive peptide tag, CX10R7, from a cysteine-encoded peptide phage library using the phage-assisted interrogation of rea...

We study the Cauchy problem for the damped wave equation. In a previous paper [16] the author has shown the Lp-Lq estimates between the solutions of the damped wave equation and the solutions of the corresponding heat equation. In this paper, we show new Lp-Lq estimates for the damped wave equation with odd initial data.

(Fig. 1).3) Butirosin (Fig. 2) has the L-HABA structure as an acylated side chain on its 2-deoxystreptamine molecule. The structural analogies between AMK and BTR suggest that AMK could be formed by feeding KMA to a broth culture of B. circulars. Recent reports on the biosynthesis of BTR4•5) indicate that the coupling of L-HABA to the ribostamycin (RBT) molecule (Fig. 2) could be one of the las...

The replacement theorem for classical and normal modal logics is a fundamental tool. It says that if A and B have been proved equivalent, occurrences of A in a formula may be replaced with occurrences of B to produce a formula equivalent to the original one. This theorem does not hold for LP, Logic of Proofs. A replacement for replacement is not simple to formulate. In this note I have provided...

the complexation reactions between mg2+, ca2+, sr2+ and ba2+ metal cations with 15-crown-5 (15c5) were studied in acetonitrile (an)-methanol (meoh) binary mixtures at different temperatures using conductometric method. 15c54 forms 1:1 complexes with mg2+, ca2+ and sr2+ cations in solutions. the ma2+ cation forms a 2:1 complex (ratio of lighand to cation) in solutions. a linear relation was obse...