عربي English Türkçe اردو فارسى
Logo
Latest News
Varieties

Study: Smelling Sense is Similar in Humans, Insects

Locusts farmed for human consumption are seen at the Kreca breeding facility in Ermelo, the Netherlands. Reuters
Locusts farmed for human consumption are seen at the Kreca breeding facility in Ermelo, the Netherlands. Reuters
TT
20
TT

Study: Smelling Sense is Similar in Humans, Insects

Locusts farmed for human consumption are seen at the Kreca breeding facility in Ermelo, the Netherlands. Reuters
Locusts farmed for human consumption are seen at the Kreca breeding facility in Ermelo, the Netherlands. Reuters

A research team from the Norwegian University of Science and Technology (NTNU) found that the process of "olfactory information" is similar in humans and insects.

By using the brain of a cotton bollworm as a model, the branching patterns and coding mechanisms the researchers detected in the small model brain seem to be relevant not only for insects, but also for mammals—which include people. The findings were published in the journal eLife on October 10.

"We find striking similarities in the structure and function of the olfactory system across different organisms. The similarities are probably related to the fact that the olfactory system is evolutionarily the oldest of all sensory systems," said Xi Chu, a researcher in Chemosensory Laboratory at NTNU and senior author on the study.

The researchers studied second-order olfactory neurons in male cotton bollworms. The males carry signals from the primary olfactory center to other areas of the brain, where the signals are further interpreted to provide the correct responses. They're strangely similar to neurons, called mitral cells, in humans and other mammals.

"When we smell something, it's because certain molecules that are dispersed in the air first activate sensory neurons in the olfactory epithelium. This is an area in the nose that captures odor molecules and carries them further into the brain's primary olfactory center. Here, the sensory terminals form a kind of map, so neurons that have the same type of olfactory receptor accumulate within spherical structures called glomeruli," Chu explained.

"Insects have a similar system of sensory olfactory neurons that form glomeruli in their antennal lobes. The similarity also applies to second-order olfactory neurons that send signals from the primary olfactory center to higher-order areas," he added.

The various odors are represented in the form of a collection of non-overlapping glomeruli in the primary olfactory center. But they are arranged in a quite different way in the subsequent second-order centers. In both insects and humans, the terminals of second-order olfactory neurons cover relatively large areas that partly overlap, he explained.

Most Viewed

 
Varieties

Berliners Jump into the Spree River to Show It’s Clean Enough for Swimming 

People swim in the river Spree to demand the lift of the hundred years old swimming ban at the river in front of the Berlin Cathedral and the TV Tower in Berlin, Germany, Tuesday, June 17, 2025. (AP)
People swim in the river Spree to demand the lift of the hundred years old swimming ban at the river in front of the Berlin Cathedral and the TV Tower in Berlin, Germany, Tuesday, June 17, 2025. (AP)
TT
20
TT

Berliners Jump into the Spree River to Show It’s Clean Enough for Swimming 

People swim in the river Spree to demand the lift of the hundred years old swimming ban at the river in front of the Berlin Cathedral and the TV Tower in Berlin, Germany, Tuesday, June 17, 2025. (AP)
People swim in the river Spree to demand the lift of the hundred years old swimming ban at the river in front of the Berlin Cathedral and the TV Tower in Berlin, Germany, Tuesday, June 17, 2025. (AP)

A century after the city of Berlin banned swimming in the Spree River because it was so polluted it could make people sick, there's a push by swimmers to get back into the water.

Around 200 people jumped into the slow-moving, greenish water Tuesday to show that it's not only clean enough, but also lots of fun to splash and swim in the Mitte neighborhood along the world-famous Museum Island.

A group calling itself Fluss Bad Berlin, or River Pool Berlin, has been lobbying for years to open the meandering river for swimmers again.

“For 100 years now, people have not been allowed to swim in the inner-city Spree and we no longer think this is justified, because we can show that the water quality is usually good enough to go swimming during the season,” said Jan Edler, who is on the board of Fluss Bad Berlin and helped organize Tuesday's swim-in.

To circumvent the ban, the group registered their collective swim event as an official protest.

Standing on a little staircase that leads down to the Spree canal, which flows around the southern side of the island, Edler stressed that “we want the people to use the Spree for recreation again.”

He pointed to the fact that the river has been cleaned up thoroughly, and that the water quality has improved in the last decade and is constantly being monitored.

Even city officials in the central Mitte district of Berlin say they'd be interested in introducing river swimming again in 2026.

“There are still many things that need to be clarified, but I am optimistic that it can succeed,” district city councilor Ephraim Gothe told German news agency dpa recently.

Supporters of lifting the swimming ban also point at Paris, where the Seine River was opened up for swimmers for the Olympic Games last year and will be opened this summer for Parisians. Swimming there had been banned since 1923.

In Vienna, too, water lovers can splash into the Danube River canal, in the Swiss city of Basel they can bathe in the Rhine, and in Amsterdam there are some designated areas where people can plunge into the canals.

Only in Berlin, swimming has been continuously prohibited in the Spree since May 1925, when the German capital closed all traditional river pools because the water was deemed too toxic. Some of those pools weren't only used for recreational swimming, but were a place for poor people to wash themselves if they didn't have bathrooms at home.

These days, the water is clean on most days, except when there's heavy rain, which leads to some water pollution.

Allowing swimmers to dive into the river would also mean loosening the historical monument protection on some parts of the riverbanks to install easy access ways to the water and places for lifeguards.

Another problem is the busy boat traffic on the Spree that could endanger swimmers. However, for the time being, the Fluss Bad Berlin group only wants to open up nearly 2-kilometer-long (just over a mile-long) canal where there's no boat traffic.

For what it's worth, the German capital, a city of 3.9 million, could definitely need more places where people can cool off in the summer as regular outdoor pools tend to be hopelessly overcrowded on hot summer days.

“The cities are getting hotter,” Edler said. “It's also a question of environmental justice to create offers for people who just can’t make it out of the city when it’s so hot and can enjoy themselves in the countryside.”