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What are Populations and Communities?

What are Populations and Communities?

Vaccinations

Vaccinations

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Learning to draw Fischer projections of molecules and understanding their relevance plays a crucial role in the visual depiction of organic molecules. A Fischer projection is a two-dimensional projection on a planar surface to simplify the three-dimensional wedge–dash representation of molecules. This is especially helpful in the case of molecules with multiple chiral centers that can be difficult to draw. Here, all the bonds of interest are represented as horizontal or vertical lines. While...

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Different notations are used to represent the three-dimensional structure of molecules on two-dimensional surfaces. One of the most commonly used representations is the dash-wedge formula. The dashed wedges, solid wedges, and the plane lines indicate the groups situated behind the plane, coming out of the plane, and in the plane, respectively.
The organic molecules rotate across the single bonds leading to numerous temporary three-dimensional structures of varying energy known as...

Conservation of Small Populations

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Small population sizes put a species at extreme risk of extinction due to a lack of variation, and a consequent decrease in adaptability. This weakens the chances of survival under pressures such as climate change, competition from other species, or new diseases. Large populations are more likely to survive pressures such as these, as such populations are more likely to harbor individuals that have genetic variants that are adaptive under new stresses. Small populations are much less...

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A population is composed of members of the same species that simultaneously live and interact in the same area. When individuals in a population breed, they pass down their genes to their offspring. Many of these genes are polymorphic, meaning that they occur in multiple variants. Such variations of a gene are referred to as alleles. The collective set of all the alleles within a population is known as the gene pool.

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Related Experiment Video

Updated: Feb 15, 2026

Dynamic Monitoring of Seroconversion using a Multianalyte Immunobead Assay for Covid-19

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Published on: February 16, 2022

Lessons Learned in Recruiting for a Community Project on COVID-19 Vaccination Messaging Within a Hispanic Population.

Karishma Chatterjee¹, Chyng-Yang Jang¹, Grace Ellen Brannon¹

¹The University of Texas at Arlington, Arlington, TX, USA.

Health Promotion Practice

|February 14, 2026

Summary

Community-based recruitment strategies effectively engaged Hispanic/Latino populations for COVID-19 vaccine perception research. This approach overcame participation barriers, informing future public health communication for diverse groups.

Keywords:

COVID-19 Hispanic PEN-3 model communication infrastructure theory community partnerships health equity health research participation

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Published on: November 7, 2020

Area of Science:

Public Health
Health Communication
Sociology

Background:

COVID-19 disproportionately impacted U.S. Hispanic/Latino communities, yet research participation is hindered by systemic and historical factors.
Lower COVID-19 vaccination rates necessitate understanding vaccine perceptions within these communities.
Existing research faces challenges in engaging Hispanic/Latino populations due to various barriers.

Purpose of the Study:

To explore Hispanic/Latino perceptions of COVID-19 vaccines.
To inform the design of effective public health messages for vaccination.
To detail recruitment strategies for engaging this population in health research.

Main Methods:

Utilized a multifaceted recruitment strategy based on the PEN-3 model and communication infrastructure theory.
Employed community partners (meso-level agents) as recruitment enablers and communication hotspots.
Incorporated micro-level agents for digital literacy support during survey navigation.

Main Results:

Meso-level agents, like community partners, were crucial for participant recruitment and engagement.
Micro-level agents provided essential support, facilitating survey completion.
The study identified specific successful strategies and challenges in recruiting Hispanic/Latino participants.

Conclusions:

A community-centered, multi-layered recruitment approach is effective for health research in Hispanic/Latino communities.
Understanding community dynamics and providing targeted support enhances participation and data quality.
Findings offer practical implications for designing culturally relevant health messages and improving research engagement strategies.