A cover (with triples) of λKn is an ordered pair (V,B) where V is an n-element set and B is a set of 3-element subsets of V called blocks such that each 2-element subset of V appears in at least λ blocks. Define E(B) = {{x, y}, {x, z}, {y, z} | {x, y, z} ∈ B}. The excess (sometimes called the padding) of a cover is defined to be E(B)−E(λKn), although it is often convenient to think of the exces...

Dynamic systems based on consecutive thia-Michael and Henry reactions were generated and transformed using lipase-catalyzed asymmetric transformation. Substituted thiolane structures with three contiguous stereocenters were resolved in the process in high yields and high enantiomeric excesses.

The embryonic nervous system is refined over the course of development as a result of the twin processes of naturally occurring cell death and selective axon pruning. Recent studies provide new insights into the molecular events that underlie axon pruning and underscore the diversity of refinement processes employed by the nervous system during development.

The elaboration of an ever increasing number of chiral catalysts or reagents demands fast and sensitive methods to measure enantiomeric excesses of the products. This review discusses the various ways to solve these problems. Mass spectrometry, chromatographic or chiroptical methodologies, fluorescence, liquid crystals, enzymatic methods, and immunoassays, are some of the technologies which may...

Trace minerals are required for essentially all biochemical processes in the body. Many of these minerals are necessary for optimal growth, physiologic function, and productivity in animals. This paper focuses on 8 trace minerals: cobalt (Co), copper (Cu), iodine (I), iron (Fe), manganese (Mn), molybdenum (Mo), selenium (Se), and zinc (Zn). These trace minerals have been chosen because nutritio...

Denote by an l-component a connected graph with l edges more than vertices. We prove that the expected number of creations of (l + 1)-component, by means of adding a new edge to an l-component in a randomly growing graph with n vertices, tends to 1 as l, n tends to ∞ but with l = o(n1/4). We also show, under the same conditions on l and n, that the expected number of vertices that ever belong t...

Ten novel hydrogen-bonding catalysts based on open-chain P(V)-amides of BINOL and chinchona alkaloids as well as three catalysts based on rigid cis-P(V)-cyclodiphosphazane amides of N (1),N (1)-dimethylcyclohexane-1,2-diamine have been developed. Employed in the asymmetric Michael addition of 2-hydroxynaphthoquinone to β-nitrostyrene, the open-chain 9-epi-aminochinchona-based phosphorus amides ...

As Vietnam continues to industrialize and modernize, such economic development high-tech will require a major electrical energy source operate the equipment; hence, hydropower plants are established growing up demand. Therefore, purpose of this study is evaluate business performance Vietnamese suppliers by integrating LTS(A,A,A) model Additive Holt-winters method in Tableau super-slacks-based m...