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Binding and Fusion: HIV begins its life cycle
when it binds to a CD4 receptor and one of two
co-receptors on the surface of a CD4+
Tlymphocyte. The virus then fuses with the host
cell. After fusion, the virus releases RNA, its
genetic material, into the host cell.
Reverse Transcription: An HIV enzyme
called reverse transcriptase converts the singlestranded HIV RNA to double-stranded HIV DNA.
Integration: The newly formed HIV DNA
enters the host cell's nucleus, where an HIV
enzyme called integrase "hides" the HIV DNA
within the host cell's own DNA. The integrated
HIV DNA is called provirus. The provirus may
remain inactive for several years, producing few or
no new copies of HIV
Transcription: When the host cell receives a
signal to become active, the provirus uses a host
enzyme called RNA polymerase to create copies of
the HIV genomic material, as well as shorter
strands of RNA called messenger RNA (mRNA).
The mRNA is used as a blueprint to make long
chains of HIV proteins.
Assembly: An HIV enzyme called protease cuts
the long chains of HIV proteins into smaller
individual proteins. As the smaller HIV proteins
come together with copies of HIV's RNA genetic
material, a new virus particle is assembled.
Budding: The newly assembled virus pushes out
("buds") from the host cell. During budding, the new
virus steals part of the cell's outer envelope. This
envelope, which acts as a covering, is studded with
protein/sugar combinations called HIV
glycoproteins. These HIV glycoproteins are
necessary for the virus to bind CD4 and coreceptors. The new copies of HIV can now move
on to infect other cells.
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Sólo En Los Estados Unidos, Aproximadamente 1 De Cada 6 Personas Sufre De Dolores De Cabeza Crónicos Y Migrañas. Ellos Sufren De Forma Infrecuente,
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Sex reassignment surgery for male-to-female involves reshaping the male genitals into a form with the appearance of, and, as far as possible, the function of female genitalia. Prior to any surgeries, patients usually undergo hormone replacement therapy (HRT), and, depending on the age at which HRT begins, facial hair removal. There are associated surgeries patients may elect to, including facial feminization surgery, breast augmentation, and various other procedures
What is Venipuncture? While venipuncture can refer to a variety of procedures, including the insertion of IV tubes into a vein for the direct application of medicine to the blood stream, in phlebotomy venipuncture refers primarily to using a needle to create a blood evacuation point. As a phlebotomist, you must be prepared to perform venipuncture procedures on adults, children, and even infants while maintaining a supportive demeanor and procedural accuracy. Using a variety of blood extraction tools, you must be prepared to respond to numerous complications in order to minimize the risk to the patient while still drawing a clean sample. In its entirety, venipuncture includes every step in a blood draw procedure—from patient identification to puncturing the vein to labeling the sample. Patient information, needle placement, and emotional environment all play a part in the collection of a blood sample, and it's the fine details that can mean the difference between a definite result and a false positive. After placing the tourniquet and finding the vein, it's time for the phlebotomist to make the complex choice on what procedure will best suit the specific situation. Keeping this in mind, it should be noted that the following information is not an instructional guide on how to perform these phlebotomy procedures. Rather, the information below is intended to serve as an educational resource to inform you of the equipment and procedures you will use. Venipuncture Technqiues Venipuncture with an Evacuated or Vacuum Tube: This is the standard procedure for venipuncture testing. Using a needle and sheath system, this procedure allows multiple sample tubes to be filled through a single puncture. This procedure is ideal for reducing trauma to patients. After drawing the blood, the phlebotomist must make sure the test stopper is correctly coded and doesn't contact exposed blood between samples. Venipuncture with a Butterfly Needle : This is a specialized procedure that utilizes a flexible, butterfly needle adaptor. A butterfly needle has two plastic wings (one on either side of the needle) and is connected to a flexible tube, which is then attached to a reservoir for the blood. Due to the small gauge of the needle and the flexibility of the tube, this procedure is used most often in pediatric care, where the patients tend to have smaller veins and are more likely to move around during the procedure. After being inserted into a vein at a shallow angle, the butterfly needle is held in place by the wings, which allow the phlebotomist to grasp the needle very close to the skin. Phlebotomists should be careful to watch for blood clots in the flexible tubing. Venipuncture with a Syringe: This technique is typically only used when there is a supply shortage, or when a technician thinks it is the appropriate method. It uses the classic needle, tube, and plunger system, operating in a similar manner to the vacuum tube but requiring multiple punctures for multiple samples. Additionally, after the blood is drawn it must be transferred to the appropriate vacuum tube for testing purposes. If you choose to use this method, remember to check for a sterile seal, and use a safety device when transferring the sample. Fingerstick (or Fingerprick): This procedure uses a medical lance to make a small incision in the upper capillaries of a patient's finger in order to collect a tiny blood sample. It is typically used to test glucose and insulin levels. When performing a Fingerstick, the phlebotomist should remember to lance the third or fourth finger on the non-dominant arm. Never lance the tip or the center of the finger pad; instead, lance perpendicular to the fingerprint lines. Heelstick (or Heelprick): Similar to the Fingerstick procedure, this process is used on infants under six months of age. A medical lance is used to create a small incision on the side of an infant's heel in order to collect small amounts of blood for screening. As with a Fingerstick, the incision should be made perpendicular to the heel lines, and it should be made far enough to the left or right side of the heel to avoid patient agitation. Before performing a Heelstick, the infant's heel should be warmed to about 42 degrees Celsius in order to stimulate capillary blood and gas flow. Therapeutic Phlebotomy: This involves the actual letting of blood in order to relieve chemical and pressure imbalances within the blood stream. Making use of a butterfly needle, this therapy provides a slow removal of up to one pint of blood. Though the blood removed is not used for blood transfusions, the procedure and concerns are the same as with routine blood donation. As with any phlebotomy procedure, one should pay close attention to the patient in order to prevent a blood overdraw. Bleeding Time: A simple diagnostic test that is used to determine abnormalities in blood clotting and platelet production. A shallow laceration is made, followed by sterile swabbing of the wound every 30 seconds until the bleeding stops. Average bleed times range between one and nine minutes. As a phlebotomist, you should familiarize yourself with the application and cross-application of these procedures in order to recognize when a procedure is necessary, and what the risks are for each.
Low potassium (hypokalemia) refers to a lower than normal potassium level in your bloodstream. Potassium is a chemical (electrolyte) that is critical to the proper functioning of nerve and muscles cells, particularly heart muscle cells. Normally, your blood potassium level is 3.6 to 5.2 millimoles per liter (mmol/L). A very low potassium level (less than 2.5 mmol/L) can be life-threatening and requires urgent medical attention.
Seeing blood in your urine can cause anxiety. While in many instances there are benign causes, blood in urine (hematuria) can also indicate a serious disorder. Blood that you can see is called gross hematuria. Urinary blood that's visible only under a microscope is known as microscopic hematuria and is found when your doctor tests your urine. Either way, it's important to determine the reason for the bleeding. Treatment depends on the underlying cause.
How do you make a working human heart? Scientists can turn stem cells into beating heart cells, but getting them to organize into a 3D heart requires a scaffold. At the Massachusetts General Hospital in Boston, Harald Ott and his team are reusing the scaffold that nature provides. They’re stripping away all the living cells from dead hearts, before filling in the leftover matrix with healthy new cells. In this video, Brendan Maher finds out how the technique could be used to develop parts of the heart, like the aortic root and valve, for transplant.
Although most women have had enough experience to know how to pleasure a man in the bedroom, but you can be sure that are several girls who would be virgins when you first take them to bed. Though most Indian men actually prefer to make love with a virgin. There are also numerous men who dislike the idea due to the pressure of making love to someone with no experience. So if you happen to be dating a virgin then there are a few important things that you should always keep in mind when you take her to bed. Though you have made love to different women before, you need to understand that this one being a virgin will know little or nothing about what is expected of her in bed. Because she will be anxious and nervous, you have to be all the more careful to ensure that she gets to enjoy her first time with you. Kiss her Whether you are doing it with a virgin or someone with a record that would put Pam Anderson to shame, you should take your time to make love to her just with your lips. Use your lips with passion, and kiss her parts that other guys tend to ignore. Kiss her lips, her hips, her shoulders, her hands, nuzzle her ears - parts which aren’t necessary sexual. Give your girl a hand Okay this one may look straight out of a B-grade south Indian movie, but starting off with a sensual full body massage is an excellent way of warming her up. So use some nice aromatic oils like lavender or Yang-Yang to massage her body. If you are more experienced, you would be aware the various erogenous zones of a woman’s body. Start with the nape of her neck and slowly work your way down to her back, gently knead her breasts and play with her nipples, gently flick at them and manipulate them to erection. Get her to lie on her stomach and massage her inner thighs. Lovingly caress her buttocks and move your hands close to her valley of pleasure. She might be too shy to tell you, but her ultimate pleasure point would be dying for your attention. Gently, stroke her outer lips or the labia. Whatever, apprehensions or fears she may have had about sex will all disappear once your finger start creating magic in her nether regions. Never criticise her Remember, she has never felt a man’s body before, which essentially means that when she tries to explore your body you may not necessarily enjoy it. So let her hold your penis and fondle it, let her lick and nibble you and tickle you body. You may not find her amateurish attentions very arousing but don’t make her feel like an amateur in bed. If she does something right let her know how much you are enjoying it. Guide her fingers to your pleasure points and tell her what you would like a girl to do in bed. Being the more experienced partner you should be like her loving mentor, and teach her the intricacies of pleasuring a man. Make her touch herself While she may or may not have masturbated before, by getting her to touch herself you would be able to make her feel the unknown. Tell her how badly you want to see her masturbate. The idea is open her to own sexuality. Its time to penetrate When you think that she is finally ready to be penetrated, enter her as gently as possible. Also make sure that she is producing enough lubrication to facilitate the act. Keep your strokes slow and shallow and avoid pushing too deep during your first few strokes. If you are able to make her feel comfortable and safe, any pain that she may experience in the beginning will soon disappear, and be replaced by moans of ecstasy. The first time can be nerve racking for most men. Just remember how nervous you were when you had sex for the first time. So when your take your virginal girlfriend to bed for first time makes the experience as pleasurable for her as possible.
Inflammation of the uvula is known as uvulitis. Your uvula will appear red, puffy, and larger than normal. Other symptoms of uvulitis may include: itching burning a sore throat spots on your throat snoring difficulty swallowing trouble breathing If you have a swollen uvula along with a fever or abdominal pain, consult with your doctor right away. In rare cases, the uvula can swell enough to block your airway. Swelling of the throat is a life-threatening event. If this happens, seek immediate medical attention. What causes a swollen uvula? Causes Inflammation is your body’s response when it’s under attack. Triggers for inflammation include: environmental and lifestyle factors an infection trauma genetics Environmental and Lifestyle Factors The most common food allergies are peanuts tree nuts milk eggs wheat soy fish, including shellfish You could be having an allergic reaction to something you touched, swallowed, or breathed in. Some common allergens include: food irritants , such as dust, animal dander, or pollen medication exposure to chemicals or other toxic substances, including tobacco Infection You can get viral infections or bacterial infections. Examples of viral infections include: the common cold the flu mononucleosis chickenpox measles croup The most common bacterial infection is strep throat, which occurs due to Streptococcus pyogenes, which is a type of group A Streptococcus. If you have infected tonsils, or tonsillitis, severe inflammation can cause them to push against and irritate your uvula. Trauma Trauma to the uvula can happen if you need an intubation, such as during surgery. Your uvula can also be injured during a tonsillectomy. This is a procedure to remove your tonsils, which are located on both sides of your uvula. Your throat and uvula can also become irritated if you have acid reflux disease or if you vomit frequently. Genetics A condition called hereditary angioedema (HAE) can cause swelling of the uvula and throat, as well as swelling of the face, hands, and feet. Other symptoms include nausea, vomiting, and abdominal pain. It’s an uncommon genetic mutation that occurs in 1 in 10,000 to 1 in 50,000 people. It’s rare, but there are case reports of individuals who have an elongated uvula, which can also interfere with breathing. What are the risk factors for a swollen uvula? Risk Factors Anyone can get uvulitis, but adults get it less often than children do. You’re at increased risk if you: have allergies use tobacco products are exposed to chemicals and other irritants in the environment have a weakened immune system, making you more susceptible to infections How is a swollen uvula diagnosed? Diagnosis If you have fever or swelling of your throat, see your doctor. Be prepared to give a complete medical history. Tell your doctor: about all the over-the-counter and prescription medications you take if you’re a smoker or you chew tobacco if you’ve recently tried new foods if you’ve been exposed to chemicals or unusual substances about your other symptoms, such as abdominal pain, fever, or dehydration Your doctor may be able to make a diagnosis through a physical exam. It’s likely you’ll also need a throat swab to evaluate for strep or to obtain secretions for culture to determine if you have another bacterial or fungal infection. This test is known as the rapid strep test. You may also need a nasal swab to test for influenza. Blood testing can help identify or rule out some other infectious agents. If those tests are inconclusive, you may need to see an allergist. Blood and skin tests can help identify foods or other substances that cause a reaction. Learn more: Allergy testing » If necessary, imaging tests can provide a more detailed view of your throat and the surrounding area. What’s the treatment for a swollen uvula? Treatment When you have something like the common cold, swelling usually clears up on its own without treatment. Otherwise, treatment will depend on how severe your symptoms are, as well as what’s causing the inflammation. Infection Viral infections tend to clear up without treatment. The only upper respiratory infection for which an antiviral medication is available is influenza. Antibiotics can treat bacterial infections. Even after symptoms clear up, take all the medication as prescribed. If your condition may be contagious, stay home until your doctor tells you that you’re no longer at risk of spreading it to others. Allergy If you test positive for an allergy, try to avoid the allergen in the future. Doctors usually treat allergies with antihistamines or steroids. Anaphylaxis is a severe allergic reaction. Doctors use epinephrine to treat this reaction. Hereditary angioedema Your doctor may treat HAE with any of the following: anabolic steroids, or androgens antifibrinolytics C1 inhibitors, such as C1 esterase inhibitor (Berinert) or C1 esterase inhibitor (recombinant) (Ruconest) a plasma kallikrein inhibitor, such as ecallantide (Kalbitor) bradykinin receptor antagonist, such as icatibant injection (Firazyr) Tell your doctor if you have new or worsening symptoms, and follow up as necessary. Tips for relief home treatment If you have a swollen uvula or sore throat, it’s your body’s way of telling you that something is wrong. A few home remedies can help keep you strong and soothe your irritated throat. Make sure you’re getting enough fluids. If your throat hurts when you drink, try drinking small amounts throughout the day. Your urine should be light in color. If it’s dark yellow or brown, you’re not drinking enough and may be dehydrated. Additional tips include the following: Cool your throat by sucking on ice chips. Frozen juice bars or ice cream may also do the trick. Gargle with warm salt water to ease your dry, scratchy throat. Aim for a full night’s sleep, and nap during the day if you can. What’s the outlook? Outlook A swollen uvula isn’t a common occurrence. Most of the time it clears up without treatment. If you have an infection, prompt treatment should take care of the problem within a week or two. If you have allergies that lead to swelling of the uvula or throat, do your best to avoid that allergen. You should also be prepared to deal with an attack if you come into contact with the substance again. If you’ve ever had anaphylaxis, ask your doctor if you should carry injectable epinephrine (EpiPen) in case of emergency. People with HAE must learn to recognize triggers and early warning signs of an attack. Talk to your doctor about how to manage HAE. 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Megacolon, as well as megarectum, is a descriptive term. It denotes dilatation of the colon that is not caused by mechanical obstruction.[1, 2] Although the definition of megacolon has varied in the literature, most researchers use the measurement of greater than 12 cm for the cecum as the standard. Because the diameter of the large intestine varies, the following definitions would also be considered: greater than 6.5 cm in the rectosigmoid region and greater than 8 cm for the ascending colon. Megacolon can be divided into the following 3 categories: Acute megacolon ( pseudo-obstruction) Chronic megacolon, which includes congenital, acquired, and idiopathic causes Toxic megacolon