تشير دراسة كبرى من جامعة ميشيغان إلى أن الطفرات المفيدة قد تكون أكثر شيوعًا بكثير مما افترضته النظريات التطورية التقليدية. لكن هذه الطفرات لا تنتشر دائمًا في كامل الجماعات لأن الظروف البيئية المتغيرة قد تعيد تشكيل ميزان الانتقاء باستمرار.
A major research study is challenging one of evolution’s most influential ideas: that most genetic changes that become permanent are essentially neutral. Researchers at the University of Michigan found that beneficial mutations are actually far more common than scientists have long assumed. The puzzle is that these advantageous mutations rarely spread through entire populations.
Their answer? Nature keeps changing the rules.
الأبحاث
A groundbreaking superconducting X-ray spectrometer has begun operation at BESSY II, giving Europe its first TES-based system and boosting photon detection efficiency by up to 1,000 times. The advance enables scientists to explore atomically thin materials, nanostructures, and ultra-dilute samples with remarkable speed and sensitivity.
الأبحاث
A new international study finds that middle-aged Americans are lonelier, more depressed, and experiencing worse memory and health than earlier generations. Researchers say growing financial strain, weaker social supports, and chronic stress may explain why the U.S. is falling behind other wealthy nations.
الأبحاث
A groundbreaking new connectome maps every neural connection in an adult fruit fly’s central nervous system, creating an unprecedented view of how the brain and body work together. The findings suggest that complex behaviors emerge from distributed local circuits rather than a single central controller, offering new clues about intelligence, movement, and brain function.