MNDO semi-empirical SCF MO calculations are used to study the pyramidal nitrogen atom inversion and configurational equilibria in the title compounds.

Telfairia occidentalis belongs to the family cucurbitaceae. It is a plant with dark green leaves that also bears pod containing edible seeds. widely cultivated in Western Africa, having high commercial importance eastern part of Nigeria. primarily used preparation soup form vegetable and herbal medicines for production blood tonic weak ill person, treatment other ailments. extract fractions wer...

let $r$ be a ring‎, ‎and let $n‎, ‎d$ be non-negative integers‎. ‎a right $r$-module $m$ is called $(n‎, ‎d)$-projective if $ext^{d+1}_r(m‎, ‎a)=0$ for every $n$-copresented right $r$-module $a$‎. ‎$r$ is called right $n$-cocoherent if every $n$-copresented right $r$-module is $(n+1)$-coprese-nted‎, ‎it is called a right co-$(n,d)$-ring if every right $r$-module is $(n‎, ‎d)$-projective‎. ‎$r$ ...

mndo semi-empirical scf mo calculations are used to study the pyramidal nitrogen atom inversion and configurational equilibria in the title compounds.

In this article we introduce the notion of n-capable groups. It is shown that every group G admits a uniquely determined subgroup (〖Z^n)〗^* (G) which is a characteristic subgroup and lies in the n-centre subgroup of the group G. This is the smallest subgroup of G whose factor group is n-capable. Moreover, some properties of n-central extension will be studied.

0

The tea aphid ( Toxoptera aurantii Boyer de Fonscolombe) is an important plant pest insect worldwide. parasitoid wasp, Aphelinus sp., one of the most natural enemies in China. Unfortunately, sp. alone cannot effectively control outbreaks under conditions. In this study, 27 volatile compounds from aphid-injured shoots, flowers, sex pheromones, or body rinses were selected and tested Y-tube olfac...

Let $nin mathbb{N}$. An additive map $h:Ato B$ between algebras $A$ and $B$ is called $n$-Jordan homomorphism if $h(a^n)=(h(a))^n$ for all $ain A$. We show that every $n$-Jordan homomorphism between commutative Banach algebras is a $n$-ring homomorphism when $n < 8$. For these cases, every involutive $n$-Jordan homomorphism between commutative C-algebras is norm continuous.

0