Ossification - formation of bone tissue - can occur by two processes: intramenbranous ossification and endochondral ossification. In the first case, bone tissue gradually appears in a conjunctival, non-cartilaginous membrane. In endochondral ossification, a bone-shaped cartilage piece serves as a template for making bone tissue.
UPDATED: NASA has created a stir in social networks in recent days when it announced a live conference on Monday morning, which would reveal a major scientific discovery on Mars. The press conference, which took place a few minutes ago at the James Webb Auditorium at NASA Washington headquarters, was attended by Jim Green, NASA's director of planetary science, Michael Meyer, chief scientist for the Mars Exploration Program, Lujendra Ojha of the Georgia Institute of Technology, Mary Beth Wilhelm of the NASA Ames Research Center and the Georgia Institute of Technology, and Alfred McEwen, lead researcher for HiRISE (camera onboard the Mars Reconnaissance Orbiter that allows you to get high-resolution Mars images resolution) of the University of Arizona.
New research confirms that substance in the product harms corals in many different ways The importance of corals goes far beyond their beauty that delights divers. It is in the shelter of the reefs that a quarter of the fish that live in the oceans spend their first days. This kind of natural motherhood is being threatened on all sides: Global warming has always been the main villain, but a recently published study puts its finger on another wound - and it is smeared with sunscreen.
Species are one of the oldest in the world; today it is in danger of extinction. An animal from the cryptobranch family, known in Portuguese as giant salamander, was found in a cave near Chongqing, China, and is causing astonishment to scholars for its good condition. It is estimated that the huge specimen - about 1.3 meters long and 52 kilograms - is already around two hundred years old.
Oxford University research gives the scientific basis for a millennial teaching synthesized at its best: whoever sings evil amazes. It doesn't take a professional musician to know that music is powerful. It takes you into the past, makes you afraid, makes you happy, our mind and soul are incredibly susceptible to its power - no wonder, therefore, that it helps us make new friends.
It is the first time that animal skeletons of this period have been discovered throughout the southern hemisphere. 280 million years ago Piaui and Texas were not that far away. In fact, the two places were very close, separated only by a mountain range. As neighbors, it is natural that their fauna was very similar; Both were in the Gondwana megacontinent.
Resistant and adaptable, the species is at the center of the current Zika epidemic, as well as being a vector of contagion of dengue, chikungunya and yellow fever and other rarer diseases. In the world, it is called the yellow fever mosquito. In Brazil, it is known as the Dengue Mosquito - and more recently also Zika and Chikungunya.
Lemon is a fruit that has a very sour taste. It, like other citrus fruits, is acidic as it contains ascorbic acid and citric acid. Many acids are used in industries. There was a time when the production and use of certain acids were considered indicative of a country's industrial development.
Atoms of chemical elements are represented by symbols consisting of one, two or three letters. For sodium Na is used for chlorine Cl; for carbon, C; and so on. Note that the first letter is always uppercase. Usually the mass number (A) is represented in the upper left corner, and the atomic number (Z) in the lower left corner.
In the center of an atom is its nucleus, which although small, contains almost the entire mass of the atom. Protons and neutrons are the particles found therein, each with a unitary atomic mass. The number of protons in the nucleus establishes the atomic number of the chemical element and the number of protons plus the number of neutrons is the atomic mass number.
Depending on their composition, we can classify the acids in: Oxyacids There are acids that have the element oxygen in their composition, such as nitric acid (HNO 3) and sulfuric acid (H 2 SO 4), substances widely used in industry. chemistry. These acids are called oxyacids.
Property that matter has to return to its initial volume - after the force that causes the compression has ceased. The plunger is being pushed into the air outlet of the syringe, but this outlet is blocked by the finger. The plunger, when released from the force to which it was subjected, returns to the initial position on the syringe, and this shows the elasticity of the air.
What has density to do with fluctuation? To try to answer this question, let's calculate the density of water. Before that, we need to experimentally determine the volume and mass of one or more samples of this liquid. Examples of results of these determinations are: 1 cm 3 of water has mass 1 g; 2 cm 3 of water have mass 2 g; 100 cm 3 of water have mass 100 g; 1.
Chemists use expressions, called chemical equations, to represent chemical reactions. To write a chemical equation is necessary to know which substances are consumed (reagents) and which are formed (products); know the formulas of reagents and products; Always write the equation as follows: reagents => products when more than one reagent or more than one product participates in the reaction, the substance formulas will be separated by the "+" sign; if necessary, put numbers, called stoichiometric coefficients, before substance formulas so that the equation indicates the conservation of atoms.
Force is related to movement Imagine a block of wood resting on a table. This block tends to remain at rest unless "something" sets it in motion. This "something" is the action of a force. Imagine that the block is set in motion with the momentary application of a horizontal force.
You make a lot of use of electricity in your daily life, right? But have you ever thought about how much she would miss your life if it didn't exist? If there is a power outage at night, we run out of electricity and everything stops: the television, the electric shower, the fan, some telephone sets, the stereo, the computer, the microwave, the elevators, etc.
We have seen that electrons move easily in conductive bodies. The displacement of these electric charges is called the electric current. Electric current is responsible for the operation of electrical appliances; These only work when the current flows through them. Current through a device is only possible if it is in a closed circuit.
There is a very interesting type of magnet called an electromagnet. It is a device in which electricity runs through a wire wrapped around a piece of iron and behaves like a magnet. You can build an electromagnet at home: An electromagnet starts with a battery or battery (or some other power source) and a wire.
If a falling hammer hits your foot, it will hurt you because at the moment of contact it exerts a force on your foot. This is easy to understand and accept. It turns out that your foot also applies to the hammer a force of equal intensity to the force it receives from the hammer. This is already harder to understand and to accept.
Imagine that you are carrying a bunch of books and have to take them to a room on one floor above the floor you are on. For this you may choose to use one of two ramps. The first one is very sloping, and the other has a gentle slope. Which ramp would you choose? Well, if you wanted to make the least effort, you probably would have no doubt choosing the soft one.
Surfing, talking on the cell phone, listening to music, playing the guitar… Is there a physical phenomenon common to all these actions? You have probably often heard the word "wave" or words derived from it. The waves are present in the light that illuminates the day; in the operation of the cell phone, the TV, the radio, the microwave, the chatting of your friends, the music you listen to… they are present almost everywhere.