Stable hydrodynamic lubrication film is needed between the tooth profiles for smooth running and long life ofa single-screw compressor. This lubrication film is easily established with "straight line enveloping screw pair" rotors, but this kind of engagement pair is very difficult to machine. In this paper it is suggested that 11 a conical surface two-envelope engagement pair '' be used as the ...

Among all hydrocarbons, the methane molecule contains highest amount of hydrogen with respect to carbon. Therefore, catalytic decomposition is considered as an efficient approach produce along nanostructured carbon product. On other hand, presence in composition initial gas mixture required for stable operation catalyst. In present work, experiments on methane–hydrogen were performed a flow-thr...

We study the territory covered by N Lévy flights by calculating the mean number of distinct sites, ^SN(n)&, visited after n time steps on a d-dimensional, d>2, lattice. The Lévy flights are initially at the origin and each has a probability Al 2(d1a) to perform an l -length jump in a randomly chosen direction at each time step. We obtain asymptotic results for different values of a . For d52 an...

Single nucleotide polymorphisms (SNPs) in genes involved in thyroid hormone metabolism may affect thyroid hormone bioactivity. We investigated the occurrence and possible effects of SNPs in the deiodinases (D1-D3), the TSH receptor (TSHR), and the T(3) receptor beta (TR beta) genes. SNPs were identified in public databases or by sequencing of genomic DNA from 15 randomly selected subjects (30 a...

The extensive use of two alleles (Rht-B1b and Rht-D1b) at the Rht-1 locus in wheat allowed dramatic increases in yields, triggering the so-called "Green Revolution." Here, we found that a new natural allelic variation (Rht-B1i) containing a single missense SNP (A614G) in the coding region significantly increased plant height against the genetic background of both Rht-D1a (11.68%) and Rht-D1b (7...

Dopamine D(1A) receptor function is impaired in obesity-induced insulin resistance, contributing to sodium retention. We showed previously that uncoupling of D(1A) receptors from G proteins is responsible for diminished natriuretic response to dopamine in obese Zucker rats (OZRs). We hypothesized that overexpression of G protein-coupled receptor kinases (GRKs) leads to increased phosphorylation...

The central Keraf suture recorded complex lithospheric-scale deformation associated with the formation of Neoproterozoic Arabian-Nubian shield and hosts WG03, Central Zone UTM gold deposits, Gabgaba district, NE Sudan. This study aims at (i) unravelling tectonic history by (ii) interpreting spatial genetic relationships between structural setting mineralization. To this end, we coupled field pe...

Wheat (Triticum aestivum L.) cultivars with long coleoptiles can be sown deeply for better seedling establishment in drought environments. A population of 139 recombinant inbred lines (RILs) from a cross between a long-coleoptile Chinese landrace, Wangshuibai, and shortcoleoptile U.S. wheat cultivar, Wheaton, were characterized for coleoptile length and plant height. Heritabilities for coleopti...