Cardiac Memory-induced T-wave Inversions

Introduction: Cardiac memory refers to T-wave inversions that result when normal ventricular activation resumes following a period of abnormal ventricular activation.Case Report: We present a case of a 29-year-old man with a pacemaker who presented with new, deep symmetric T-wave inversions caused by cardiac memory.Discussion: Abnormal ventricular activation is most commonly induced by ventricular pacing but can also occur in the setting of transient left bundle branch blocks, ventricular tachycardia, and intermittent ventricular pre-excitation.Conclusion: Recognition of this phenomenon may help to reduce unnecessary admissions, cardiac testing, and cardiac catheterizations

Maximum grain yield of corn as influenced by plant spacing, density and N, P and K fertilization

The objectives of these studies were to (1) determine the maximum yield of corn (Zea mays L.) under prevailing climatic conditions in eastern and central Iowa and (2) determine what combination of controlled factors of N, P and K fertilization, plant density, row spacing, hybrid and timing of N application would give maximum yields. Eight experiments were conducted in eastern and central Iowa in 1982 through 1984;Weather had a moderating effect in all but one experiment by either delaying planting providing severe moisture stress. Mean experiment grain yields ranged from 6.49 Mg ha[superscript] -1 in 1983 to 11.2 Mg ha[superscript] -1 in 1984. Combinations of the controlled variables that gave maximum yield varied with site year. There was no yield response to N fertilizer above the lowest rates which ranged from 67 to 168 Kg N ha [superscript] -1. Soil P levels were sufficient to produce maximum yields even when no fertilizer P was applied. Grain yields responded to the top K fertilizer rate of 279 Kg K ha[superscript] -1 in 1982 and the intermediate rate of 186 Kg K ha[superscript] -1 in 1984. However, in 1983, added P and K fertilizer resulted in a negative yield response;In all experiments, the lowest plant densities, which ranged from 49,420 to 64,246 plants ha[superscript] -1, gave maximum yields. The only deviation from this pattern was a 1984 interactive effect in which the 88,888 plants ha[superscript] -1 plant density gave maximum yields when K was adequate. The row spacing variable resulted in a yield difference only in 1982 when 50-cm rows had an advantage over 75-cm rows. Hybrid had a significant effect on yield in all but one experiment;Although varying the levels of the controlled variables in these experiments did not increase yields greatly, the following conclusions were reached: (1) Weather and hybrid selection were critical factors in determining maximum yield. (2) The plant density that produced the maximum yield was affected by hybrid selection, mineral nutrition and moisture and temperature stresses. (3) Nitrogen fertilizer rates of 67 to 168 Kg ha[superscript] -1 and soil P levels of 29 to 32 mg Kg[superscript] -1 were sufficient to produce maximum yields in these experiments. However, these levels may not be adequate in periods of more favorable weather. (4) Added fertilizer K had positive effects on grain yield and on plant lodging when plant densities and N fertilizer rates were increased

Containing the AIDS Virus . . . Testing . . . Reporting . . . Confidentiality . . . Quarantine . . . Constitutional Considerations

In addition to illness, disability, and death, AIDS has evoked fear in the hearts and minds of most Americans: fear of the AIDS virus and fear of the unknown. This fear has caused many Americans to act irrationally towards AIDS and its victims. This article will analyze the different legislative acts intended to curtail the spread of the disease and whether these enactments will aid or merely hinder the containment of the AIDS virus. It will illustrate potential conflicts this legislation poses to the AIDS victims\u27 constitutional rights of privacy and liberty. At its conclusion, it will illustrate that with rational proposals, much more modified disclosures, education, and counseling, the AIDS epidemic can be curtailed much more successfully

Coupled systems of fractional equations related to sound propagation: analysis and discussion

In this note we analyse the propagation of a small density perturbation in a one-dimensional compressible fluid by means of fractional calculus modelling, replacing thus the ordinary time derivative with the Caputo fractional derivative in the constitutive equations. By doing so, we embrace a vast phenomenology, including subdiffusive, superdiffusive and also memoryless processes like classical diffusions. From a mathematical point of view, we study systems of coupled fractional equations, leading to fractional diffusion equations or to equations with sequential fractional derivatives. In this framework we also propose a method to solve partial differential equations with sequential fractional derivatives by analysing the corresponding coupled system of equations

Glyco-gold nanoparticles: Synthesis and applications

Glyco-gold nanoparticles combine in a single entity the peculiar properties of gold nanoparticles with the biological activity of carbohydrates. The result is an exciting nanosystem, able to mimic the natural multivalent presentation of saccharide moieties and to exploit the peculiar optical properties of the metallic core. In this review, we present recent advances on glyco-gold nanoparticle applications in different biological fields, highlighting the key parameters which inspire the glyco nanoparticle design

Fractional diffusions with time-varying coefficients

This paper is concerned with the fractionalized diffusion equations governing the law of the fractional Brownian motion $B_H(t)$. We obtain solutions of these equations which are probability laws extending that of $B_H(t)$. Our analysis is based on McBride fractional operators generalizing the hyper-Bessel operators $L$ and converting their fractional power $L^{\alpha}$ into Erd\'elyi--Kober fractional integrals. We study also probabilistic properties of the r.v.'s whose distributions satisfy space-time fractional equations involving Caputo and Riesz fractional derivatives. Some results emerging from the analysis of fractional equations with time-varying coefficients have the form of distributions of time-changed r.v.'s