Bifid Crestwort
Bifid refers to something that is split or cleft into two parts. It may refer to: * Bifid, a variation in the P wave, R wave, or T wave in an echocardiogram in which a wave which usually has a single peak instead has two separate peaks * Bifid cipher, a type of cipher in cryptography * Bifid penis * Bifid nose, a split nose that can even look like two noses; a fairly common trait in some dog varieties, especially the and its descendants * Bifid rib A bifid rib is a congenital abnormality of the rib cage and associated muscles and nerves which occurs in about 1.2% of humans. Bifid ribs occur in up to 8.4% of Samoans. The sternal end of the rib is cleaved into two. It is usually unilateral. ...

P Wave (electrocardiography)
The P wave on the ECG represents atrial depolarization, which results in atrial contraction, or atrial systole. Physiology The P wave is a summation wave generated by the depolarization front as it transits the atria. Normally the right atrium depolarizes slightly earlier than left atrium since the depolarization wave originates in the sinoatrial node, in the high right atrium and then travels to and through the left atrium. The depolarization front is carried through the atria along semi-specialized conduction pathways including Bachmann's bundle resulting in uniform shaped waves. Depolarization originating elsewhere in the atria (atrial ectopics) result in P waves with a different morphology from normal. Pathology Peaked P waves (> 0.25 mV) suggest right atrial enlargement, cor pulmonale, (''P pulmonale'' rhythm), but have a low predictive value (~20%). A P wave with increased amplitude can indicate hypokalemia. It can also indicate right atrial enlargement. A P wave ...
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QRS Complex
The QRS complex is the combination of three of the graphical deflections seen on a typical electrocardiogram (ECG or EKG). It is usually the central and most visually obvious part of the tracing. It corresponds to the depolarization of the right and left ventricles of the heart and contraction of the large ventricular muscles. In adults, the QRS complex normally lasts ; in children it may be shorter. The Q, R, and S waves occur in rapid succession, do not all appear in all leads, and reflect a single event and thus are usually considered together. A Q wave is any downward deflection immediately following the P wave. An R wave follows as an upward deflection, and the S wave is any downward deflection after the R wave. The T wave follows the S wave, and in some cases, an additional U wave follows the T wave. To measure the QRS interval start at the end of the PR interval (or beginning of the Q wave) to the end of the S wave. Normally this interval is 0.08 to 0.10 seconds. When ...
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T Wave
In electrocardiography, the T wave represents the repolarization of the ventricles. The interval from the beginning of the QRS complex to the apex of the T wave is referred to as the ''absolute refractory period''. The last half of the T wave is referred to as the ''relative refractory period'' or ''vulnerable period''. The T wave contains more information than the QT interval. The T wave can be described by its symmetry, skewness, slope of ascending and descending limbs, amplitude and subintervals like the Tpeak–Tend interval. In most leads, the T wave is positive. This is due to the repolarization of the membrane. During ventricle contraction (QRS complex), the heart depolarizes. Repolarization of the ventricle happens in the opposite direction of depolarization and is negative current, signifying the relaxation of the cardiac muscle of the ventricles. But this negative flow causes a positive T wave; although the cell becomes more negatively charged, the net effect is in t ...
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Bifid Cipher
In classical cryptography, the bifid cipher is a cipher which combines the Polybius square with transposition, and uses fractionation to achieve diffusion. It was invented around 1901 by Felix Delastelle. Operation First, a mixed alphabet Polybius square is drawn up, where the I and the J share their position: 1 2 3 4 5 1 B G W K Z 2 Q P N D S 3 I O A X E 4 F C L U M 5 T H Y V R The message is converted to its coordinates in the usual manner, but they are written vertically beneath: F L E E A T O N C E 4 4 3 3 3 5 3 2 4 3 1 3 5 5 3 1 2 3 2 5 They are then read out in rows: 4 4 3 3 3 5 3 2 4 3 1 3 5 5 3 1 2 3 2 5 Then divided up into pairs again, and the pairs turned back into letters using the square: 44 33 35 32 43 13 55 31 23 25 U A E O L W R I N S In this way, each ciphertext character depends on two plaintext characters, so the bifid is a digraphic cipher, like the Playfair cipher. To decrypt, the procedure is simply reversed. Longer messages are fir ...
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Bifid Penis
A bifid penis (or double penis) is a rare congenital defect where two genital tubercles develop. Many species of male Marsupial#Reproductive system, marsupials have a naturally bifurcated penis, with left and right prongs that they insert into multiple vaginal canals simultaneously. See also * Diphallia * Meatotomy * Penile subincision References

Congenital disorders of male genital organs Penis disorders Marsupial anatomy Intersex variations {{Genetic-disorder-stub ...
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Bifid Nose
A bifid nose (also known as cleft nose) is an uncommon congenital malformation which is characterized by the presence of a cleft between the two nostrils of the nose. It is the result of a disturbance during embryological nose development. It is part of the Tessier classification for craniofacial clefts. Signs and symptoms The visibility of this malformation varies from person to person; from a barely noticeable "line" in the middle of the nose to the complete clefting of the nose which results in two "half noses", the airway is usually adequate. Individuals with this birth anomaly don't have any symptoms related to their bifid nose. Complications This condition is merely cosmetic, and the severity of it doesn't affect a person with the disorder (health-wise) since usually there is a normal and adequate nasal airway. Diagnosis This condition can be diagnosed by physical examination. This difference can serve as a diagnostic method since it occurs alongside other malfo ...
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