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Life Histories

Life Histories

Hydrogen Bonds

Hydrogen Bonds

Hydrogen bonds are weak attractions between atoms that have formed other chemical bonds. One of these atoms is electronegative, like oxygen, and has a partial negative charge. The other is a hydrogen atom that has bonded with another electronegative atom and has a partial positive charge.
Hydrogen Bonds Control the World!
Because hydrogen has very weak electronegativity when it binds with a strongly electronegative atom, such as oxygen or nitrogen, electrons in the bond are unequally shared....

Hearing

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When we hear a sound, our nervous system is detecting sound waves—pressure waves of mechanical energy traveling through a medium. The frequency of the wave is perceived as pitch, while the amplitude is perceived as loudness.

Hardy-Weinberg Principle

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Diploid organisms have two alleles of each gene, one from each parent, in their somatic cells. Therefore, each individual contributes two alleles to the gene pool of the population. The gene pool of a population is the sum of every allele of all genes within that population and has some degree of variation. Genetic variation is typically expressed as a relative frequency, which is the percentage of the total population that has a given allele, genotype or phenotype.

Specific Heat

Specific Heat

The specific heat capacity of a substance refers to the energy required to increase the temperature of one gram of that substance by one degree Celcius. Specific heat capacity is often represented in calories (cal), grams (g), and degrees Celsius (oC), but can also be expressed in joules (J), kilograms (kg), and Kelvin (K), among other units.
For example, increasing the temperature of one gram of water by 1°C requires one calorie of heat energy and can be written as 1 cal/g-°C, or...

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The response to stress—be it physical or psychological, acute or chronic—involves activation of the Hypothalamic-Pituitary-Adrenal (HPA) axis. The HPA axis is part of the neuroendocrine system because it involves both neuronal and hormonal communication. Its function is to regulate homeostatic systems—metabolic, cardiovascular, and immune—providing the necessary means to respond to a stressor.

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Related Experiment Video

Updated: Oct 4, 2025

Design, Fabrication, and Administration of the Hand Active Sensation Test HASTe

Design, Fabrication, and Administration of the Hand Active Sensation Test HASTe

Published on: September 8, 2015

Joseph Heitman.

Joseph Heitman¹

¹Departments of Molecular Genetics and Microbiology, Pharmacology and Cancer Biology, and Medicine, Duke University Medical Center, 322 CARL Building, Research Drive, Durham, NC 27710, USA.

Current Biology : CB

|February 8, 2022

Summary

This summary is machine-generated.

Joseph Heitman discusses research on fungi, including those that cause disease. His work at Duke University Medical Center advances understanding of fungal biology and infections.

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Last Updated: Oct 4, 2025

Design, Fabrication, and Administration of the Hand Active Sensation Test HASTe

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Published on: September 8, 2015

Modifying the Bank Erosion Hazard Index BEHI Protocol for Rapid Assessment of Streambank Erosion in Northeastern Ohio

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Area of Science:

Mycology
Pathogen research
Medical microbiology

Background:

Interview with Joseph Heitman, a leading researcher in mycology.
Focus on the study of model and pathogenic fungi.
Affiliated with Duke University Medical Center.

Discussion:

Exploration of Heitman's research contributions.
Insights into the significance of studying fungal pathogens.
Discussion on the implications for human health and disease.

Key Insights:

Understanding of fungal biology and genetics.
Advancements in identifying and combating fungal infections.
Importance of model organisms in pathogenic research.

Outlook:

Future directions in fungal research.
Potential for new therapeutic strategies against fungal diseases.
The role of Heitman's work in shaping the field.