(1) For every relational structure L and for all elements x, y of Lop holds x ≤ y iff xx ≥xy. (2) Let L be a relational structure, x be an element of L, and y be an element of Lop. Then (i) x ≤xy iff x` ≥ y, and (ii) x ≥xy iff x` ≤ y. (3) For every relational structure L holds L is empty iff Lop is empty. (4) For every relational structure L holds L is reflexive iff Lop is reflexive. (5) For ev...

The stability of the Lindelöf property under the formation of products and of sums is investigated in ZF (= Zermelo-Fraenkel set theory without AC, the axiom of choice). It is • not surprising that countable summability of the Lindelöf property requires some weak choice principle, • highly surprising, however, that productivity of the Lindelöf property is guaranteed by a drastic failure of AC, ...

Eukaryotic initiation factor 5A (eIF-5A) was originally isolated as a translation initiation factor. However, this function has since been reconsidered, with recent studies pointing to roles for eIF-5A in mRNA metabolism and trafficking [Microbiol. Mol. Biol. Rev. 66 (2002) 460; Eur. Mol. Biol. Org. J. 17 (1998) 2914]. The Caenorhabditis elegans genome contains two eIF-5A homologues, iff-1 and ...

Interstitial fluid flow (IFF) has been widely hypothesized to mediate skeletal adaptation to mechanical loading. Although a large body of in vitro evidence has demonstrated that fluid flow stimulates osteogenic and antiresorptive responses in bone cells, there is much less in vivo evidence that IFF mediates loading-induced skeletal adaptation. This is due in large part to the challenges associa...

Abstract The oil-immersed transformer is studied, and the support vector machine (SVM) algorithm used. radial basis selected as kernel function optimized by improved fruit fly (IFF) based on parameter characteristics to diagnose faults. By simulation experiment, it concluded that proposed SVM using IFF can not only avoid local extremum problem but also show good generalization ability for small...