Observations on the Staining of Bacterial Flagella

Influence of the pH of the medium, on the staining of flagella, as shown by several of the more highly recommended methods

A New Reservation Area in Iowa

Adjoining the city of McGregor on the west, an area of about twenty acres, called the Iowa Memorial Arboretum is projected. This is to be restocked, where needed, with native species, and certain hardy exotics are also to be introduced. Other attractions, including a museum, are projected

The Biota of the Cedar River as Related to Odor and Taste Production

This paper presents a brief summary of surveys carried through the past two years, as an aid in the control of odor and taste in city water. So far as the writer is aware, no work of this kind has previously been done at Cedar Rapids, hence comparisons can only be drawn between the years covered, or amongst the months represented

Weeds and Their Control

The aim of this bulletin has been to include only the worst weeds which are more or less general throughout the state, but the writer has also added other facts of interest and value about weeds. The successful man or woman of today must know a great deal more than formerly about his or her occupation and about good living if more profit and enjoyment are to be obtained from life. This bulletin contains more than a mere set of directions, by which one may come to know and destroy some weeds. How weeds destroy the value of labor, of crops, of livestock, of farms, and of human health, are explained by the author who has had many years of experience as a farmer, teacher, and investigator. It is hoped that those having special weed problems which are not included will be led to further study of the books and other sources mentioned at the end of the bulletin, and to further inquiry directed to the Experiment Station specialists

Additions to the Flora of Linn County

A list of unreported species for Linn County, Iowa, together with remarks upon emendations

Combining the Performance Strengths of the Logistic Regression and Neural Network Models: A Medical Outcomes Approach

The assessment of medical outcomes is important in the effort to contain costs, streamline patient management, and codify medical practices. As such, it is necessary to develop predictive models that will make accurate predictions of these outcomes. The neural network methodology has often been shown to perform as well, if not better, than the logistic regression methodology in terms of sample predictive performance. However, the logistic regression method is capable of providing an explanation regarding the relationship(s) between variables. This explanation is often crucial to understanding the clinical underpinnings of the disease process. Given the respective strengths of the methodologies in question, the combined use of a statistical (i.e., logistic regression) and machine learning (i.e., neural network) technology in the classification of medical outcomes is warranted under appropriate conditions. The study discusses these conditions and describes an approach for combining the strengths of the models

Suckling a protein-restricted rat dam leads to diminished albuminuria in her male offspring in adult life: a longitudinal study.

BACKGROUND: Previous studies have shown that in male rats, exposure to maternal protein restriction either in utero or whilst suckling can have profound effects on both longevity and kidney telomere lengths. This study monitored albuminuria longitudinally in male rats whose mothers had been protein restricted either during pregnancy or lactation. METHODS: Pregnant Wistar rats were fed either a 20% ('control') or an 8% protein ('low protein') diet. At two days of age some of the pups were cross-fostered to dams fed the diet that was not given to their biological mothers. At weaning all pups were fed standard chow. Urine samples were collected for the measurement of albumin and creatinine at monthly intervals from two months-of-age. Longitudinal analysis was then performed using repeated measures analysis of variance. RESULTS: Overall estimated marginal geometric mean (95 % confidence interval) urine albumin to creatinine ratios were: control animals 79.5 (57.2 to approximately 110.6) g/mol (n = 6 litters, 24 animals in total), those exposed in utero to maternal protein restriction 71.0 (47.4 to approximately 106.5) (n = 4 litters, 16 animals in total), those exposed to maternal protein restriction whilst suckling 21.2 (14.7 to approximately 30.4) (n = 5 litters, 20 animals in total) (p < 0.001). These latter animals had lower albumin to creatinine ratios than either of the two other groups (both p < 0.001), which had ratios that were indistinguishable from each other (p = 1.0). Similar results were gained using 24 h. urine albumin excretion rates. These differences became evident from three months-of-age and were long-lasting. CONCLUSION: Animals exposed to maternal protein restriction whilst suckling exhibited lower urine albumin excretions during much of adult life. As urine albumin can be nephrotoxic, these rats therefore appeared to be relatively protected against future nephron damage like that previously observed in animals exposed to maternal protein restriction in utero

On the instantaneous Bethe-Salpeter equation

We present a systematic algebraic and numerical investigation of the instantaneous Bethe-Salpeter equation. Emphasis is placed on confining interaction kernels of the Lorentz scalar, time component vector, and full vector types. We explore stability of the solutions and Regge behavior for each of these interactions, and conclude that only time component vector confinement leads to normal Regge structure and stable solutions.Comment: Latex (uses epsf macro), 26 pages of text, 12 postscript figures included

Bound q2qˉ2q^2\bar q^2 states in a constituent quark model

We consider the existence of bound systems consisting of two quarks and two antiquarks ($q^2\bar q^2$) within the framework of a constituent quark model. The underlying quark dynamics is described by a linear confinement potential and an effective $q^2\bar q^2$ interaction which has its origin in instanton effects of QCD. We calculate the spectra and examine the internal structure of the states found.Comment: 11 pages, needs epsf.st