Support efforts boost persistence despite pandemic, hurricanes

Insufficient efforts to boost maternal health.

Persistence despite perturbations for interacting populations.

Two definitions of persistence despite perturbations in deterministic models are presented. The first definition, persistence despite frequent small perturbations, is shown to be equivalent to the existence of a positive attractor i.e. an attractor bounded away from extinction. The second definition, persistence despite rare large perturbations, is shown to be equivalent to permanence i.e. a po...

Persistence of Goiter despite Adequate Iodine Intake

Objective: To evaluate the state of iodine uptake and frequency of goiter in a previously endemic population after use of iodine salt for ten years. Methodology: In an area in south of Iran following examination of randomly selected 1504, 8-10 year school children, 102 cases with grade 2 or larger goiter were found. One hundred normal cases regarding thyroid examination were also selected as co...

New coronavirus with "pandemic potential" sparks global surveillance efforts.

Persistence of strong and switchable ferroelectricity despite vacancies

Vacancies play a pivotal role in affecting ferroelectric polarization and switching properties, and there is a possibility that ferroelectricity may be utterly eliminated when defects render the system metallic. However, sufficient quantitative understandings of the subject have been lacking for decades due to the fact that vacancies in ferroelectrics are often charged and polarization in charg...