The relationship between native richness and exotic success depends on the index of exotic success and environmental gradients

The theory of resource use pre-emption suggests that diverse communities may be more resistant to invasion than simple communities due to lack of niche space for invaders. Studies examining the relationship of native species richness to exotic success have provided mixed support for this idea. To test this theory, I measured plant diversity and cover across topographic gradients differing in resource availability in a California serpentine grassland, and measured exotic success as either species richness, absolute cover, or dominance of exotic species. I then evaluated models predicting these different measures of exotic success, using either native richness alone or in conjunction with environmental variables as predictors. Species richness was a poor index of exotic success, as it was relatively weakly related to more direct measures of exotic success, exotic cover and dominance, and varied differently along environmental gradients from those two variables. Native richness was a significant negative predictor of exotic success whether environmental variables were included or excluded, although the relationship was stronger when using exotic cover or dominance than exotic richness. My results contrast with observational studies that have found positive relationships between native and exotic richness, in part because environmental conditions favoring native richness at the site (low Ca:Mg) were opposite to those favoring exotics, and in part because exotics likely out-competed natives in more fertile habitats. Using cover or dominance as an index of exotic success and incorporating underlying environmental gradients provided a more realistic assessment of the factors controlling native and exotic success than simple models correlating native and exotic richness

Case Report: Disposition of Symptomatic Probable COVID-19

Introduction: The novel coronavirus disease 2019 (COVID-19) presents a challenge for healthcare providers in terms of diagnosis, management, and triage of cases requiring admission.Case Report: A 47-year-old male with symptoms suspicious for COVID-19, pulse oximetry of 93% on room air, and multifocal pneumonia was risk stratified and safely discharged from the emergency department (ED) despite having moderate risk of progression to acute respiratory distress syndrome. He had resolution of his symptoms verified by telephone follow-up.Conclusion: Various risk-stratifying tools and techniques can aid clinicians in identifying COVID-19 patients who can be safely discharged from the ED

A solved problem of triglyceride analysis

Peer Reviewedhttps://deepblue.lib.umich.edu/bitstream/2027.42/141434/1/lipd0295.pd

Developments in Correlated Fermions

This manuscript is based on the Summary and Overview talk given at the "The International Conference of Strongly Correlated Electronic Systems" (SCES '04), July 26-30, at Karlsruhe, Germany. After highlighting some of the principal new experimental developments in heavy fermions presented at the conference, I turn to two kinds of theoretical questions. (1) What is understood of the fermi-liquid state of the heavy fermions and what is not, but may reasonably well be understood by systematic calculations. (2) The profound issues raised by the observed correlations near the quantum critical points in the heavy fermions. The numbers and letters in the parenthesis in the text refer to the listing of the talks in the "Program and Abstracts" book of the conference

Management of Monophasic Synovial Sarcoma of the Small Intestine

Although prognosis for patients with intraabdominal synovial sarcoma is poor, laparoscopic wide regional excision may allow for a more prolonged disease-free survival