Какое число будет записано в ячейку b2 после ввода формул
10 Cool Facts about the B-2
July 17, 2019 marked 30 years since the B-2 Spirit first took to the skies and became our nation’s premier long-range strike bomber. The B-2, a Northrop Grumman engineering marvel and legendary aircraft, spelled a quantum leap for technology and American air superiority. Even today, the B-2 continues to perform, inspire and pave the way forward.
1 – An Engineering Marvel
To bring the B-2 to life, Northrop Grumman had to invent all components from scratch. That list included tools, a software laboratory, composite materials, special test equipment, and 3-D modeling and computer systems. Related manufacturing processes were also created.
2 – Why it’s No. #1
When the U.S. must go to war, the B-2 is there on the first night. The B-2 went into enemy territory on Night One in support of Operation Allied Force (Serbia); Operation Enduring Freedom (Afghanistan); Operation Iraqi Freedom (Iraq) and twice in Libya in support of Operation Odyssey Dawn and Operation Odyssey Lightning. The B-2, one of the most survivable aircraft in the world, is the only aircraft to combine long-range, stealth and a heavy payload on a single platform.
3 – Legendary Combat Debut
The B-2 saw its first operational use during Operation Allied Force. Two B-2s flew more than 31 hours from Whiteman Air Force Base in Missouri to Kosovo. They attacked multiple targets, then flew directly back. The B-2s flew less than 1 percent of the total missions, yet destroyed 33 percent of the targets during the first eight weeks of conflict.
4 – Beast Mode: Longest Aerial Combat Mission in History
The B-2 holds the record for longest air combat mission in history. In 2001, the Spirit of America and five other B-2s were the first to enter Afghan airspace for a record setting 44-hour mission. The aircraft’s performance is even more impressive in that the B-2 made a quick pit stop for a 45-minute crew and service change with engines still running. It then flew back to Missouri for another 30-hour flight for a total of more than 70 consecutive hours.
5 – Red Carpet Realness
When Hollywood needs a “super bomber” to make a cameo and fight off a giant monster or an alien invasion, the red carpet is rolled out for the B-2. With an unmistakable silhouette and flying wing design, it’s easily one of the most recognized aircraft in the world. It has appeared in movies including “Independence Day,” “Armageddon,” “Iron Man 2,” “Cloverfield,” “Airplanes,” “Rampage” and, most recently, “Captain Marvel.”
6 – The Team Today
Northrop Grumman continues to upgrade and enhance the B-2’s capabilities, and service every B-2 aircraft. From the extensive programmed depot maintenance that ranges from the complete restoration of the jet’s exterior surfaces to software engineering, testing and development. Our employees also lead vehicle engineering, logistics and product support for the aircraft.
7 – Dimensions
The B-2 is 69 feet long, 17 feet high and has a wingspan of 172 feet, half the length of a football field.
8 – High Subsonic
The B-2 can reach a high subsonic speed and can also reach an altitude of more 50,000 feet.
9 – Intercontinental Range
The B-2 can travel 6,000 nautical miles without refueling and 10,000 nautical miles with only one refueling. It can reach any point in the world within hours.
10 – Payload
A B-2 can carry a payload of 20 tons.
Какое число будет записано в ячейку B2 после ввода формул?
Какое число будет записано в ячейку B2 после ввода формул?
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Benefits and sources of vitamin B2
Vitamin B2 is an essential B vitamin for human health. People may also refer to it as riboflavin. Health benefits of vitamin B2 include supporting cellular functions that provide the body with energy, allowing it to work efficiently.
Vitamin B2 is a water-soluble vitamin, so it dissolves in water. All vitamins are either water soluble or fat soluble. Water-soluble vitamins are carried through the bloodstream, and whatever is not needed passes out of the body in urine.
People need to consume vitamin B2 every day, because the body can only store small amounts, and supplies go down rapidly.
Riboflavin occurs naturally in some foods, added to others, and it can be taken as supplements. Most of it is absorbed in the small intestine.
Vitamin B2 helps break down proteins, fats, and carbohydrates. It plays a vital role in maintaining the body’s energy supply.
Riboflavin helps convert carbohydrates into adenosine triphosphate (ATP). The human body produces ATP from food, and ATP produces energy as the body requires it. The compound ATP is vital for storing energy in muscles.
Along with vitamin A, vitamin B is essential for:
- Maintaining the mucous membranes in the digestive system
- Maintaining a healthy liver
- Converting tryptophan into niacin, an amino acid
- Keeping the eyes, nerves, muscles and skin healthy
- Absorbing and activating iron, folic acid, and vitamins B1, B3 and B6
- Hormone production by the adrenal glands
- Preventing the development of cataracts
- Fetal development, especially in areas where vitamin deficiency is common
Some research suggests that vitamin B2 may help prevent cataracts and migraine headache, but further studies are needed to confirm this.
Other studies have found that in children with autism, supplements of vitamins B2, B6, and magnesium appear to reduce the levels of abnormal organic acids in the urine.
Vitamin B2 comes from food.
Sources of B2 include:
Share on Pinterest Meat, fish, and dairy products provide vitamin B2.
- Fish, meat, and poultry, such as turkey, chicken, beef, kidneys, and liver
- Eggs
- Dairy products
- Asparagus
- Artichokes
- Avocados
- Cayenne
- Currants
- Fortified cereals
- Kelp
- Lima beans, navy beans, and peas
- Molasses
- Mushrooms
- Nuts
- Parsley
- Pumpkins
- Rosehips
- Sage
- Sweet potatoes
- Cruciferous vegetables, such as broccoli, Brussels sprouts, spinach, dandelion greens, and watercress
- Whole-grain breads, enriched breads, and wheat bran
- Yeast extract
Vitamin B2 is water soluble, so cooking foods can cause it to be lost. About twice as much B2 is lost through boiling as it is through steaming or microwaving.
How much do we need?
According to Oregon State University, the recommended daily allowance (RDA) of vitamin B2 in for men aged 19 years and over is 1.3 milligrams per day, and for women, it is 1.1 milligram per day. During pregnancy, women should have 1.4 milligrams per day, and when breastfeeding, 1.6 milligrams per day.
Vitamin B2 deficiency is a significant risk when diet is poor, because the human body excretes the vitamin continuously, so it is not stored. A person who has a B2 deficiency normally lacks other vitamins too.
There are two types of riboflavin deficiency:
- Primary riboflavin deficiency happens when the person’s diet is poor in vitamin B2
- Secondary riboflavin deficiency happens for another reason, maybe because the intestines cannot absorb the vitamin properly, or the body cannot use it, or because it is being excreted too rapidly
Riboflavin deficiency is also known as ariboflavinosis.
Signs and symptoms of deficiency include:
Share on Pinterest A lack of vitamin B2 can lead to mouth ulcers and other complaints.
- Angular cheilitis, or cracks at the corners of the mouth
- Cracked lips
- Dry skin
- Inflammation of the lining of the mouth
- Inflammation of the tongue
- Mouth ulcers
- Red lips
- Sore throat
- Scrotal dermatitis
- Fluid in mucous membranes
- Iron-deficiency anemia
- Eyes may be sensitive to bright light, and they may be itchy, watery, or bloodshot
People who drink excessive amounts of alcohol are at greater risk of vitamin B deficiency.
Normally, vitamin B2 is considered safe. An overdose is unlikely, as the body can absorb up to around 27 milligrams of riboflavin, and it expels any additional amounts in the urine.
However, it is important to talk to a physician before taking any supplements, especially as these can interfere with other medications.
Supplements can interact with other medications, and B2 supplements may impact the effectiveness of some drugs, such as anticholinergic medications and tetracycline.
Sometimes a doctor may recommend supplementation, for example, if a patient is using a drug that can interfere with the absorption of riboflavin.
Drugs that may interfere with riboflavin levels in the body include:
- Tricyclic antidepressants, such as imipramine, or Tofranil
- Some antipsychotic drugs, such as chlorpromazine, or Thorazine
- Methotrexate, used for cancer and autoimmune diseases, such as rheumatoid arthritis
- Phenytoin, or Dilantin, used to control seizures
- Probenecid, for gout
- Thiazide diuretics, or water pills
Doxorubicin, a drug used in cancer therapy, may deplete levels of riboflavin, and riboflavin may affect how doxorubicin works.
The University of Maryland Medical Center (UMM) note that very high amounts of vitamin B2 may lead to itching, numbness, burning or prickling, yellow or orange urine and sensitivity to light. To prevent an imbalance of B vitamins, they suggest using a B-complex vitamin if supplementation is needed.
Last medically reviewed on March 7, 2017
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