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כתבות אחרונות מאתר 'Phys'
Phys

Researchers find that some weeds get supercharged by an indirect hit of herbicide‎

A brush with low doses of the herbicide dicamba spurs oxalis, a weed commonly known as wood sorrel, to produce more flowers, University of Michigan researchers have discovered. The finding suggests that farmers and homeowners are inadvertently making weeds growing around the perimeter of their fields or lawns stronger, the researchers say. The study results are published in the journal New Phytologist.

22:23
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Phys

Better together? Coral fusion could throw bleached reefs a lifeline‎

When corals are stressed by pollution, high water temperatures or other environmental changes, they can lose the microscopic algae living inside them and on which they depend for food. As a result, they turn white, a phenomenon known as coral bleaching. They will not die straight away, but it will be game over if the stress continues long enough for them to starve.

22:23
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Phys

Lion tracks from the ice age: How two ways of seeing brought ancient animals to life‎

The coastline near the southern tip of Africa looked vastly different between about 400,000 years ago and 70,000 years ago, compared with today. At times it lay as much as 100km (62 miles) south of its present location, exposing the vast Palaeo-Agulhas Plain, which contained an extensive habitat for large mammals. At other times the sea level was briefly as much as 13 meters (43 feet) higher than today's mean level.

22:04
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Phys

New DNA sequencing methods detect rare mutations acquired as bodies grow and age‎

Somatic mutations, the DNA changes that occur as our bodies grow and age, not only hold an important key to cancer but are emerging as the seeds of a wide range of common, noncancerous diseases. The Somatic Mosaicism across Human Tissues (SMaHT) Network, a National Institutes of Health Common Fund initiative to catalog all the normal processes of somatic mutation, has published its first comprehensive benchmarking study in the journal Cell.

22:04
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Phys

How COVID reshaped college grading‎

Twenty-three Indiana University undergraduates are co-authors on a new study examining how the pandemic reshaped college grading, the result of a semester-long research seminar that took them from a classroom question to a published paper in a national academic journal.

21:42
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Phys

Nearly 600 California earthquakes help validate models that forecast next-day seismic risk‎

The University of Bristol–led study, published in Nature Communications, could help millions of people living in earthquake-prone countries make better-informed decisions about seismic risk, particularly during ongoing periods of increased earthquake activity.

21:42
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Phys

El Niño a 'terrifying' threat to coral reefs: UN biodiversity expert‎

A super El Niño fueling record ocean temperatures poses a "terrifying" threat to the world's fragile coral reefs, the chair of the U.N.'s expert nature panel told AFP.

21:25
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Phys

Plants use a molecular measuring tape to tell fungal friend from foe‎

Chitin, a chain of repeating sugar molecules, is the main building block of fungal cell walls. When fungi grow or are broken down, fragments of chitin chains of different lengths end up in the soil, and plants detect them to monitor the microbes around them.

21:25
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Phys

Study reveals how young adults' work lives affect their parents' mental health‎

Earlier this fall, researchers Sara Kalucza (Department of Sociology) and Anna Baranowska-Rataj (Center for Demographic and Aging Research, CEDAR) at Umeå University published a research article showing a connection between young people's school-to-work transitions and parental health. The research used data from CEDAR's demographic database.

21:25
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Phys

In plants, sense of time is connected with sense of danger‎

Salty soil is a growing threat to crops worldwide. Hotter, drier weather has increased evaporation rates, drawing moisture from the soil and leaving behind concentrated mineral salts. At the same time, water shortages are forcing farmers to irrigate using water from lower-quality, saline or recycled sources. Scientists estimate that around half of the world's irrigated farmland is now affected by salinity to some degree.

21:25
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