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What is the driest place on Earth?

The Atacama covers over 600 miles of southern Peru and northern Chile in South America. Some parts of the region have not recorded any rain at all since weather records have been kept. Despite the arid conditions, an estimated 1 million people live in the region, mostly near oases and coastal towns. Residents on Chile's northwest coast use fine mesh nets connected to troughs to capture moisture from the dense fog that rolls in from the Pacific Ocean.

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What is a multivalent metal?

In the periodic table of elements, the transition and the right-most metals are multivalent metals. Some of these metallic elements include chromium, copper, cobalt, iron, mercury, manganese, tin, lead and bismuth. The most commonly occurring multivalent metals are copper and iron. Copper ions can either have a +1 or +2 charge, while iron ions can have a +2 or +3 charge. Metals that are not multivalent are called simple metals.

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Is NH3 a polar molecule?

Ammonia's polarity can be observed without determining its Lewis structure. According to Wikipedia, ammonia is miscible with water. Water is a polar solvent, and it forms covalent bonds only with polar solutes. Ammonia's ability to dissolve in water and remain in solution until energy is applied to break its covalent bonds with water marks it as a polar compound.

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What are some professional applications of polynomials?

In engineering, polynomials are used to model real phenomena in the world. For instance, complex polynomials are used in computer and electrical engineering and aerospace engineers use polynomials to model the projections of jet rockets. Scientists use polynomials in many of their formulas, including gravity, temperature and distance equations. In social science, economists need an understanding of polynomials to forecast future market patterns.

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What is HLA-B27?

A simple blood test is performed to check for HLA-B27. Doctors typically test for this antigen when a patient is having joint pain issues or when matching kidneys or bone marrow. A positive test for HLA-B27 also suggests a higher risk for developing psoriatic arthritis, Reiter's syndrome, sacroiliitis, uveitis or arthritis related to Crohn's disease. Doctors and researchers stress that HLA-B27 in the blood does not necessarily mean that a disease is present, only that there is a higher risk of certain diseases.

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What is the difference between a compound and a molecule?

Compounds includes molecules within them. For example, the hydrogen in water is a molecule because there are at least two atoms of the element; oxygen, however, would not be a molecule on its own since there's only one atom of it. Some other examples of molecules include molecular nitrogen (N2) and molecular oxygen (O2), and some other compounds include methane (CH4) and carbon dioxide (CO2).

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What are examples of fibrous proteins?

Collagen is the most abundant fibrous protein in the human body. A typical collagen molecule contains three polypeptide chains joined together by hydrogen bonds in the chain. Collagen is mostly found in the bones, skin and connective tissues within the body. It provides structural strength, support and a degree of elasticity to the body tissues.\nKeratin has a seven amino acid repeating structure. There are more than twenty-five variations of keratin in the cells of mammals. In humans, keratin is mostly found in hair and nails while in animals it is found in feathers, wool and horns. Keratin p..

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Why is the cell membrane important?

Cell membranes are extremely flexible structures that play many roles in the life of a cell. They are the only structures found in all cells, regardless of species, and serve as the attachment point for many intracellular structures such as cell walls and cytoskeletons, as well as extracellular structures such as cilia.

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Is hemophilia dominant or recessive?

People with this condition, which generally affects more males than females, lack certain blood clotting proteins that can lead to blood loss. Patients with hemophilia A have a mutation in the F8 gene, and the mutation occurs in the F9 gene in patients with hemophilia B, relates the National Institute of Health. These two genes are associated with proteins that are coagulation factors VIII and IX, respectively.Although hemophilia A and B generally affect males and is passed down through the maternal line, hemophilia C can affect both boys and girls and both parents can pass this defective chro..

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What happens to matter during a chemical reaction

Excluding nuclear reactions, chemical reactions most often involve the breaking or formation of molecular bonds due to the movement of electrons between atoms. The transfer of electrons causes different compounds and molecules to form or disperse, and when conducted in a controlled setting by chemists, often produce a desired substance.\nSynthesis reactions involve two different material substances combining to form a new substance. An example of a synthesis reaction is the combination of sodium and chlorine, creating sodium chloride, commonly known as table salt. The opposite of a synthesis r..

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