The increase in trace fossil diversity across the Neoproterozoic-Cambrian boundary often is presented in terms of tabulations of ichnogenera. However, a clearer picture of the increase in diversity and complexity can be reached by combining trace fossils into broad groups defined both on morphology and interpretation. This also focuses attention on looking for similarites between Neoproterozoic...

background: within the context of developing techniques to facilitate the diagnosis of the thyroid diseases, the elemental composition of pathological thyroid tissue (neoplastic and non-neoplastic) was investigated by proton induced x-ray emission. the pixe has been widely used as a sensitive technique for trace elemental analysis in both biological and medical fields. materials and methods: th...

wound healing in the skin depends upon the availability of appropriate trace metals as enzyme cofactors and structural components in tissue repair. the present study is a part of a series of experimental investigations to examine the influence of bentonite on skin wound healing. surgically induced skin wounds in 48 young adult male rats were exposed topically to bentonite (12 round wound and 12...

Toxic trace metallic elements such as arsenic, beryllium, cadmium, chromium, cobalt, lead, manganese, mercury, nickel, and selenium are usually contained in coal in various forms and trace amounts. These metals will either stay in the ash or be vaporized during high temperature combustion. Portions of the vaporized metals may eventually be emitted from a combustion system in the form of metal f...

The main results of the present paper are the equivalence of deenability by monadic second-order logic and recognizability for real trace languages, and that rst-order deenable, star-free, and aperiodic real trace languages form the same class of languages. This generalizes results on innnite words and on nite traces to innnite traces. It closes an important gap in the diierent characterization...

The Maxwell theory on non-commutative spaces has been considered. The non-linear equations of electromagnetic fields on non-commutative spaces were obtained in the compact spin-tensor (quater-nion) form. We found the symmetric energy-momentum tensor and its non-zero trace. So, the trace anomaly of the energy-momentum tensor was obtained in electrodynamics on non-commutative spaces. It was noted...

We propose an approach, via relative trace formulae, toward the global restriction problem involvingBessel or Fourier–Jacobi periods on unitary groupsUn×Um , generalizing the work of Jacquet–Rallis form = n−1 (which is a Bessel period). In particular, whenm = 0, we recover a relative trace formula proposed by Flicker concerning Kloosterman/Fourier integrals on quasi-split unitary groups.As evid...

We settle the main question left open in HiSl] by establishing that for all n there exists a Turing degree a with jump trace of the form (? ! 0 ; ? n) | that is, for all k 2 !, 0 (k) T a (k) T 0 (n+k) and a (k) is incomparable with 0 (k+1) ; : : :; 0 (n+k?1). It follows that every consistent jump trace is realized.