Biological Sciences

UN makes population growth projections

World population projection through 2100. The shaded area marks all possible population numbers.
Source: Wikimedia Commons

According to a new statistical projection made by the United Nations (UN) and the University of Washington (UW), Seattle, the world population is likely to reach as many as 13 billion individuals by the end of this century (1). This recent analysis uses modern statistical methods instead of experts’ opinions...

 
 

Learning fear through odor

Learning fear through odor

Babies can get new phobias just by smelling the odor of their distressed mothers. A new study by the University of Michigan Medical School and New York University School of Medicine showed mother rats can teach new fears to their young (2). The concept that factors other than DNA can...

 
 

Skin color differences inadequate for vitamin D3 compensation in northerners

Skin color differences inadequate for vitamin D3 compensation in northerners

Recent evidence suggests that a non-pigmentation mutation of the epidermal structural protein filaggrin (FLG) better explains how populations in northern latitudes, namely northern Europeans, compensate for lower levels of ultraviolet-B light exposure (1). Scientists from the University of San Francisco compiled loss-of-function FLG mutation prevalence data from various populations and...

 
 

Sensitization after an Injury Increases Survival

Sensitization after an Injury Increases Survival

Researchers at the University of Texas Medical School released the first piece of concrete evidence that nociceptive sensitization results in an adaptive advantage. Using squid (Doryteuthis pealeii)as their test organism, the scientists demonstrated that both behavioral and neurological changes resulting from noxious stimuli, like a minor injury, increase the likelihood...

 
 

Transmission of Trauma by Sperm RNA

Transmission of Trauma by Sperm RNA

  The effects of trauma can be passed down through generations, resulting in psychiatric disorders like depression in offspring. Researchers have found small non-coding RNAs (sncRNAs), molecules that could be the link between environmental factors, like trauma, and genes (1). Both genetic make-up and environmental factors serve as important contributors...

 
 
 
 
 

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