(Virgilio Marin) Plants let out “ultrasonic squeals” when they are damaged or stressed by drought. Researchers at Tel Aviv Universityin Israel discovered this after placing microphones near tomato and tobacco plants. Thanks to the microphones, the researchers were able to detect distinct sounds emanating from the plants.
(Evangelyn Rodriguez) Humans have 23 pairs of chromosomes, only one of which determines a person’s sex-linked characteristics. The remaining 22 pairs contain bundles of genetic instructions that help determine the other, non-sex-related traits. Since the discovery of DNA, researchers have endeavored to learn all there is to know about these coded sequences, including how much they weigh. The Human Genome Project, which was launched in 1990, provided an answer to this. But in a new study published in the journal Chromosome Research, British researchers discovered that the mass of human chromosomes, which house all of a person’s DNA, far exceeds theoretical values. Even after accounting for all other components (i.e., histone proteins), all 46 chromosomes still weighed considerably more than the DNA they contained.