RAM (Random Access Memory)

Random-access memory (RAM) is a form of computer data storage. Today, it takes the form of integrated circuits that allow stored data to be accessed in any order with a worst case performance of constant time. Strictly speaking, modern types of DRAM are therefore not random access, as data is read in bursts, although the name DRAM / RAM has stuck. However, many types of SRAM, ROM, OTP, and NOR flash are still random access even in a strict sense. RAM is often associated with volatile types of memory (such as DRAM memory modules), where its stored information is lost if the power is removed. Many other types of non-volatile memory are RAM as well, including most types of ROM and a type of flash memory called NOR-Flash. The first RAM modules to come into the market were created in 1951 and were sold until the late 1960s and early 1970s. However, other memory devices (magnetic tapes, disks) can access the storage data in a predetermined order, because mechanical designs only allow this.

cancer

Puru doubt  or cancer or malignant neoplasm is a disease characterized by a typical cell cycle abnormalities that give rise to cells' ability to:

    uncontrolled growth (cell division beyond the normal limits)
    attacked the nearby biological tissue.
    migrate to other body tissues through blood circulation or lymphatic system, called metastasis.
Three characters that distinguish this malignant cancer from benign tumors. Most cancers form a tumor, but some do not, such as leukemia. The branch of medicine dealing with the study, diagnosis, treatment, and prevention of cancer are called oncologists.
In general, cancer cells form a tumor, except in leukemia. The reaction between acid tetraiodotiroasetat by inhibiting the activity of integrins is the hormone thyroxine and tri-iodotironina which is one of the factors that play a role in angiogenesis and tumor cell proliferation. [2] Uncontrolled growth is caused by damage to DNA, causing mutations in vital genes that control cell division . Some mutations may be required to transform normal cells into cancer cells. These mutations are often caused by chemical or physical agents called carcinogens. Mutations can occur spontaneously (obtained) or inherited (germline mutations). Cancer can cause many different symptoms, depending on the location and character of the malignancy, as well as the presence or absence of metastasis. Diagnosis usually requires microscopic examination of tissue obtained by biopsy. Once diagnosed, cancer is usually treated with surgery, chemotherapy, or radiation.
Most cancers cause death. Cancer is one of the leading causes of death in developing countries. Most cancers can be treated and many cured, especially if treatment begins early. Many forms of cancer associated with environmental factors that could have been avoided. Smoking can cause cancer than many other environmental factors. Tumor (Latin: swelling) appoint an abnormal mass of tissue, but can be a "malignant" (cancerous) or "benign" (not cancerous). Only the malignant tumors that can invade other tissues or metastasize. Cancer can spread through the lymph nodes and blood vessels to other organs.

ELECTROMAGNETIC WAVES

Who is Cristiano Ronaldo? Or, who is vocalist Peter Pan? If you're faced with such questions can be sure you can answer it, right? Who does not know CR7 (Cristiano Ronaldo for the title) or Ariel Peter Pan? Although you never meet directly with them, you must be familiar with them, right? How could you! Although you never meet them you'll often see them on TV, right? Now, what makes you able to watch TV to see a football match going on in other places very far away? Do you know what principles and concepts underlying the technology and the phenomenon? 

He was so small that can be comfortably placed in the pocket, but is considered to have a very large function primarily to communicate. Yes, it is a mobile phone (cell phone). Nowadays mobile phones are not only used for phoning, but also for other functions such as send and receive short messages (SMS), listen to music, or taking photos. How mobile devices can connect with other mobile devices when they are far from each other?
The concept that could explain this phenomenon is the concept of electromagnetic waves. And, the concept was very broad electromagnetic waves is not only associated with TV or cell phone only, but many other applications that can often be found daily around us. Applications include microwave, radio, radar, or x-ray.
As previously discussed that there are two basic laws of electricity and magnetism connected symptoms. 

First, the electrical current can generate (induce) the magnetic field. This phenomenon is known as magnetic induction. Foundation stone of this concept is the Oersted had discovered this phenomenon experimentally and formulated in full by Ampere. Symptoms of magnetic induction is known as Ampere's Law.

Second, the magnetic field varies with time can generate (induce) electric fields in the form of electrical current. This phenomenon is known as electromagnetic induction phenomenon. The concept of electromagnetic induction discovered by Michael Faraday experimentally and formulated in full by Joseph Henry. Electromagnetic induction law itself became known as the Faraday-Henry Law. 

From these two basic principles of electric magnets above and taking into account the prevailing concept of symmetry in the laws of nature, James Clerk Maxwell submitted a proposal. Maxwell proposals put forward, namely that if the magnetic field time-varying electric fields can produce the opposite may be happening. Thus Maxwell suggested that the electric field that changes with time can generate (induce) the magnetic field. Maxwell's proposal was later to become the third law that links between electricity and magnetism.


Thus, the third principle is the electric field varies with time can produce a magnetic field. The third principle is expressed by Maxwell is basically a development of the formulation of Ampere's law. Therefore, this principle is known as the Ampere-Maxwell Law. 

Of the three basic principles of electricity and magnetism at the top, Maxwell saw an archetype. Magnetic field can generate a time-varying electric field is also changing with time, and the electric field change with time can also generate a magnetic field. If this process is continuous it will produce a magnetic field and electric field are continuous. If the magnetic field and electric field was simultaneously propagate (spread) in all directions in space then this is a wave phenomenon. Such waves are called electromagnetic waves because it consists of electric and magnetic fields that propagate in space.