We show that there are n! matchings on 2n points without, so called, left (neighbor) nestings. We also define a set of naturally labeled (2 + 2)-free posets, and show that there are n! such posets on n elements. Our work was inspired by Bousquet-Mélou, Claesson, Dukes and Kitaev [J. Combin. Theory Ser. A. 117 (2010) 884–909]. They gave bijections between four classes of combinatorial objects: m...

The main objective in this research was the genetic analysis of heterosis in rapeseed at the QTL level. A linkage map comprising 235 SSR and 144 AFLP markers covering 2045 cM was constructed in a doubled-haploid population from a cross between the cultivar "Express" and the resynthesized line "R53." In field experiments at four locations in Germany 250 doubled-haploid (DH) lines and their corre...

Using a novel dataset on local government debt and house prices in California, this paper finds that the rise in house prices caused an expansion in local governments debt in the early 2000s. The elasticity between local government debt and house prices, estimated using cross-sectional variation in the share of developable land from Saiz (2010), suggest that a percentage point rise in house pri...

This article is devoted to the personality traits of foreign students higher medical education at various stages their studies. The follow-up was carried out from 2019 2020. In new took fate 154 workers who were trained on basis Dnipro State Medical University. field, stage training, stench divided into two groups: auditory trainees (group 1) and health 1-2 courses 2). work used method a semi-s...

We show that there are n! matchings on 2n points without socalled left (neighbor) nestings. We also define a set of naturally labeled (2+2)free posets and show that there are n! such posets on n elements. Our work was inspired by Bousquet-Mélou, Claesson, Dukes and Kitaev [J. Combin. Theory Ser. A. 117 (2010) 884–909]. They gave bijections between four classes of combinatorial objects: matching...

Racemize 2-hydroxybutyric acid is usually synthesized by organic methods and needs additional deracemization to obtain optically pure enantiomers for industrial application. Here we present a cascade biocatalysis system in Escherichia coli BL21 which employed L-threonine deaminase (TD), NAD-dependent L-lactate dehydrogenase (LDH) alcohol (ADH) producing (S)-2-hydroxybutyric ((S)-2-HBA) from bul...

The Geographic Accessibility of Child Care Subsidies and Evidence on the Impact of Subsidy Receipt on Childhood Obesity This paper examines the impact of the spatial accessibility of public human services agencies on the likelihood of receiving a child care subsidy among disadvantaged mothers with young children. In particular, we collect data on the location of virtually every human services a...

The National Collegiate Athletic Association (NCAA) basketball tournament qualifies as a sports mega-event, and cities across the United States compete vigorously with one another to host what is, by most measures, the premier intercollegiate sporting event in the United States. The promise of substantial economic impact has convinced cities to “invest” substantial sums of money to meet the dem...

The semifields of order q6 which are two-dimensional over their left nucleus and six-dimensional over their center have been geometrically partitioned into six classes by using the associated linear sets in PG(3, q3). One of these classes has been partitioned further (again geometrically) into three subclasses. In this paper algebraic curves are used to construct two infinite families of odd or...