The water molecule is made up of two hydrogen atoms and one oxygen. Already the nitrogen gas, which exists in the atmosphere, is formed by the union of two nitrogen atoms. The same goes for oxygen gas. We then say that oxygen is a simple substance, since it is formed by the union of chemically equal atoms.
Nucleus Important organelle in eukaryotic cells, consists of two membranes with a space between them and containing pores. It has two basic functions: regulating the chemical reactions that take place within the cell, and storing the cell's genetic information. Inside are distinguished nucleolus and chromatin.
In this tissue the intracellular substance is reduced, and the lipid-rich cells are called adipose cells. It occurs mainly under the skin, performing functions of energy reserve, protection against mechanical shocks and thermal insulation. It also occurs around some organs such as the kidneys and the heart.
Leaf fall from a deciduous plant may occur in response to environmental signals, such as short or low temperatures in the fall, or due to adverse conditions to plant development. The young leaf has the ability to synthesize relatively high auxin levels; during senescence, auxin synthesis in leaf limb decreases considerably, which promotes rupture of the petiole in the abscission layer.
The early history of the gibberellins was an exclusive product of the Japanese scientists. In 1926, E.Kurosawa was studying a rice disease (Oryza sativa) called "mad plant disease", in which the plant grew rapidly, was tall, pale and sickly in color, with a tendency to fall.
Stamens are modified leaves where the male gametes of the flower form. The set of stamens forms the androceu (from the Greek andros, man, masculine). A stamen usually has an elongate portion, the fillet, and an enlarged end portion, the anther. The interior of the anther is generally divided into four cavities, within which pollen grains form.
Terra had access to report that points out irregularities in 36% of the samples analyzed in 2011 and 29% in 2012 Report of the National Health Surveillance Agency (Anvisa) points out that a large portion of fruits and vegetables consumed by Brazilians has high rates of waste from pesticide.
Research described for the first time a species that survived for a long time. An Antarctic moss has been reborn after spending more than 1,500 years under an ice sheet, a record that marks the longest life cycle of any known plant, a study by British scientists said in the United States.
Critter travels 322 times per second the length of its own body. 'Paratarsotomus macropalpis' debunked the Australian tiger beetle. The animal world has a new speed record, according to a study presented on Sunday, May 27, 2014, at the scientific meeting "Experimental Biology 2014" in San Diego, United States.
In 2002, Jason Padgett was the victim of a brutal attack. The sequelae were a concussion, posttraumatic stress disorder, and a sudden interest in math that just didn't exist before the injury. Bizarre, isn't it? But that's exactly how it happened: While recovering, Padgett simply began to see the world differently.
Deaths will occur if the current rate of poaching continues on the continent. Environmental organizations are meeting in Botswana this week. Africa could lose 20% of its elephants in the next 10 years if the current pace of hunting continues, warns a report published on Monday at the opening of a conference in Gaborone, Botswana dedicated to pachyderm survival.
Researchers have created dictionary with 66 gestures with 'meanings'. When mother shows foot to child, it means 'get on my back'. Chimpanzees communicate with gestures, which have specific meanings like "climb on my back," or "stop," say scientists, who have created a dictionary with 66 such gestures.
Shocks in the water cause the writhing of hidden animals. In this way they can easily locate their victims. The electric eel, also known as electric fish, for here or just eel, can unleash a powerful electric discharge to attack its defenseless prey. But this shock is not only used to stun other fish.
Research reveals prey capture as the unprecedented role of the substance. Insulin helps mollusks paralyze whole shoals of fish. Scientists have found that a clam species has a peculiar strategy for capturing its prey. These animals release insulin into the water to cause hypoglycemia in shoals of small fish.
The opah fish can regulate the temperature of its entire body The opah fish is able to capture heat from its fins, insulated by a generous layer of godura, and keep its blood and organs warm as it swims to a depth of hundreds of meters. . A study detailing this finding was published by the journal Science.
Was this how dogs became best friends of our ancestors? In the Ethiopian plains, wolves and frozen baboons live in peace. While monkeys tolerate wolves walking in the midst of their flock, wolves completely ignore primate cubs that would normally be considered a great meal.
Study observed gray-weeping Amazonian chick, which lives in Peru. By resembling a poisonous caterpillar, the cub protects itself from predators. An Amazonian bird that lives in southeastern Peru has developed a curious defense strategy against predators. As a cub, the gray wail (Laniocera hypopyrra) has a fuzz that resembles the hair of a poisonous caterpillar that lives in the region.
Scientists say the type of bacteria and fungi vary by place of residence and their residents, but point out that most of them are not harmful to health. A new scientific study suggests that we may be sharing our homes with about 9,000 different species of microbes. Researchers at the University of Colorado, United States, analyzed dust collected from 1,200 US households and found that this is the average of the types of bacteria and fungi found in the dust of an ordinary home.
Scientists at the Virginia Polytechnic Institute and State University used a mathematical model to show that bacteria can control the behavior of an inanimate device - such as a robot. Basically, researchers were trying to figure out from a mathematical model whether it would be possible to build a microbiome, deploy it on a robot, and control it.
Sure enough, Styrofoam seems to be great when it comes to warming your coffee in that cheap cup. And you can't help but appreciate those little balls of packaging that keep your fragile objects protected when transported. But this lightweight, durable material, also called polystyrene foam or expanded polystyrene, has a high environmental cost.