Given any -tuple ( s1, s2, . . . , s ) of positive integers, there is an integer N = N ( s1, s2, . . . , s ) such that an orthogonal design of order 2 ( s1 + s2 + · · ·+ s ) and type ( 2s1, 2 s2, . . . , 2 s ) exists, for each n ≥ N . This complements a result of Eades et al. which in turn implies that if the positive integers s1, s2, . . . , s are all highly divisible by 2, then there is a ful...

The starfish SALMFamide neuropeptides S1 (GFNSALMFamide) and S2 (SGPYSFNSGLTFamide) are the prototypical members of a family of neuropeptides that act as muscle relaxants in echinoderms. Comparison of the bioactivity of S1 and S2 as muscle relaxants has revealed that S2 is ten times more potent than S1. Here we investigated a structural basis for this difference in potency by comparing the bioa...

We construct a topological charge of gauge field configurations on a fuzzy S2×S2 by using a Dirac operator satisfying the Ginsparg-Wilson relation. The topological charge defined on the fuzzy S2×S2 can be interpreted as a noncommutative (or matrix) generalization of the 2nd Chern character on S2 × S2. We further calculate the number of chiral zero modes of the Dirac operator in topologically no...

In this research the sample prepared in tow steps, first step included to be ablated by using mixing kneading method formed as a Circular tablet contain Nickle Ferrite and Poly(methyl methacrylate)–(PMMA)polymer.Then abated Nd:YAG laser with 1064 nm wavelength, 600 mJ energy, 6Hz frequency 100 pulses for sampleswhich immersed dilute Crude Oil (obtained from Rumaila Field Southern Iraq). The opt...

El objetivo de este estudio fue evaluar el potencial mineralización nitrógeno (N) suelos contrastantes luego del aporte diferentes dosis cascaras semillas girasol (CG) (Helianthus annuus L.), residuo abundante sudoeste bonaerense (SOB). Se realizaron incubaciones aeróbicas largo plazo (37 semanas), utilizando tres (0-20 cm) y distintas CG calculadas con base en su contenido N orgánico: 100 (D1)...

The coronavirus spike protein (S) plays a key role in the early steps of viral infection, with the S1 domain responsible for receptor binding and the S2 domain mediating membrane fusion. In some cases, the S protein is proteolytically cleaved at the S1-S2 boundary. In the case of the severe acute respiratory syndrome coronavirus (SARS-CoV), it has been shown that virus entry requires the endoso...

We evaluated transmembrane potential changes at the ends of isolated rabbit ventricular myocytes during defibrillation-strength shocks given in the cellular refractory period. The myocytes were stimulated (S1 pulse) to produce an action potential. Then a constant-field shock (S2 pulse) with an electric field of 20 or 40 V/cm was given at an S1-S2 interval of 50 msec. The cells were stained with...