The ligand tppda has been designed and synthesized as molecular leverage for helicity control when reacted with Cd(2+) ions. The guests MeOH or DMF preferentially stabilize the P-helical isomer, while the guest H2O causes a helix inversion to give the M-helical isomer as the major isomer without any chiral auxiliary.

In a previous study we have reported that both (E,Z)-8,10-dodecadienol (E,Z) and (Z,Z)-8,10-dodecadienol (Z,Z) isomers inhibit the attraction of male codling moth, Cydia pomonella L. when added to (E,E)-8,10-dodecadienol (E,E) while the (Z,E)-8,10-dodecadienol (Z,E) isomer induces slight increase in the number of males attracted to the pheromone source. In the present study, we have tested the ...

The positional isomers of the cyclopropane fatty acids of Clostridium butyricum phospholipids have been analyzed by capillary column gas-liquid chromatography. Greater than 95% of the methylenehexadecanoic acids was the 9 , l O isomer. On the other hand, 6G70yO of the hexadecenoic acid precursors was the A7 isomer, and the remainder was the A9 isomer. Of the methyleneoctadecanoic acids 75580% w...

A four quasiparticle high-K isomer with a meanlife of 45~2! ms has been identified at 1451 keV in Ta, populated in the Yb(B,a3n! Ta reaction. The isomer decays into a rotational band which is associated with the two-quasiparticle 9 isomer at 75.3 keV. Analysis of the branching ratios within that band and the magnetic moment for the 9 isomer, supports the configuration assignment to the 9 isomer...

Boron complexes of calix[4]phyrins (1.1.1.1) were prepared by reacting the free-base ligands with BF3·Et2O. The reaction conditions can be efficiently tailored to produce mono- or di-boron calixphyrins. Mono-BF2 calixphyrins with boron coordinating to either the dipyrrin, BF2[H(Calix)], or dipyrromethane, BF2[H(Calix)] and BF2[H2(Calix)]+, bonding sites were isolated. The dipyrromethane isomer,...

A series of (2,3)-methylenepenams were examined with respect to binding to essential penicillin-binding proteins (PBPs) in Escherichia coli and Staphylococcus aureus. The compounds were also examined with respect to their interaction with Streptomyces strain R61 DD-carboxypeptidase. The alpha isomer of (2,3)-methylene penicillin G bound to PBP 3 of E. coli and other enterobacteria at 0.1 to 10 ...

of all the atoms across the cluster. For an icosahedral isomer those two steps are found to be much closer in temperature (at ≈ 240 K and 270 K, respectively). For the case of Na92, the icosahedral isomer again melts in two well defined steps, surface melting at ≈ 130 K and homogeneous melting at ≈ 240 K, whereas an amorphous isomer shows an extremely broad, featureless melting transition. In t...

trans-fatty acids (tfa) are known as a risk factor for coronary artery diseases. trans-11 vaccenic acid [va; 18:1(n-9)], known as the major trans fatty acid in milk fat, is a positional and geometric isomer of oleic acid and a precursor of conjugated linoleic acid (cla) in human . this study was carried out in order to investigate the effect of cis and trans vaccenic acids on expression of intr...

The hydrated electron eaq − has long been a species of considerable interest, studied extensively by both experimental and theoretical methods. Several recent papers have focused on the relation between eaq − and its cluster analog, H2O n , exploring, for example, the connection between the dynamics of the bulk hydrated electron and those of the excess electron in water clusters. A key question...

The electronic relaxation dynamics of water cluster anions, (H(2)O)(n)(-), have been studied with time-resolved photoelectron imaging. In this investigation, the excess electron was excited through the p<--s transition with an ultrafast laser pulse, with subsequent electronic evolution monitored by photodetachment. All excited-state lifetimes exhibit a significant isotope effect (tau(D)2(O)/tau...