The d-block contraction (sometimes called scandide contraction) is a term used in chemistry to describe the effect of having full d orbitals on the period...

minerals and are difficult to separate. The d-block contraction is less pronounced than the lanthanide contraction but arises from a similar cause. In this...

those two metals that it is seldom found with them. D-block contraction (or scandide contraction) Lanthanide Pekka Pyykko (1988). "Relativistic effects...

effect has been termed the d-block contraction and is similar to the f-block contraction normally termed the lanthanide contraction. NIOSH Pocket Guide to...

A premature ventricular contraction (PVC) is a common event where the heartbeat is initiated by Purkinje fibers in the ventricles rather than by the sinoatrial...

Atrioventricular block (AV block) is a type of heart block that occurs when the electrical signal traveling from the atria, or the upper chambers of the...

more than it does carbon, and this resemblance is enhanced by the d-block contraction, resulting in the size of the germanium atom being much closer to...

charge Noble gas compound Steric effects Lanthanide contraction d-block contraction (or scandide contraction) L. Brown, Theodore; H. Eugene LeMay Jr; Bruce...

electronegativities than aluminium and silicon, respectively, because of the d-block contraction. Elements of the fourth period immediately after the first row of...

effect. Atomic orbitals Core charge d-block contraction (or scandide contraction) Electronegativity Lanthanide contraction Shielding effect Slater-type orbitals...

the synthesis of HgF4. The scandide contraction refers to the first row transition metals; the d-block contraction is a more general term. Moh's hardness...

high ionization energy (IE) (2nd + 3rd) of gallium is explained by d-block contraction, and the higher IE (2nd + 3rd) of thallium relative to indium, has...

muscle fiber contraction. The speed of onset depends on the potency of the drug, greater potency is associated with slower onset of block. Rocuronium,...

Muscle contraction is the activation of tension-generating sites within muscle cells. In physiology, muscle contraction does not necessarily mean muscle...

although medications such as beta blockers can reduce the frequency of symptomatic PACs. Premature atrial contractions (PACs) are common in the general...

added d-subshell in gallium and the resulting d-block contraction and the first added f-subshell in thallium and the resulting lanthanide contraction. These...

different in atomic number have the same radius is a consequence of the d-block contraction. Whilst calcium is somewhat larger than magnesium, there is a steady...

block" refer to the same pattern and pathophysiology. In Wenckebach's 1906 paper, his original observations were of increasing delay in contraction of...

force of contraction of the heart. By slowing down the conduction of electrical activity within the heart, they slow down the heart beat. By blocking the calcium...

The actinide contraction is the greater-than-expected decrease in atomic radii and ionic radii of the elements in the actinide series, from left to right...

First-degree atrioventricular block (AV block) is a disease of the electrical conduction system of the heart in which electrical impulses conduct from...

onset related to an increase in the rate of cardiac contraction. Tachycardia-dependent bundle branch block can prevent both ventricles from contracting efficiently...

In economics, a recession is a business cycle contraction that occurs when there is a period of broad decline in economic activity. Recessions generally...

Third-degree atrioventricular block (AV block) is a medical condition in which the electrical impulse generated in the sinoatrial node (SA node) in the...

bundle branch block (RBBB) is a heart block in the right bundle branch of the electrical conduction system. During a right bundle branch block, the right...

and Y is said to be a contraction if its operator norm ||T || ≤ 1. This notion is a special case of the concept of a contraction mapping, but every bounded...

which decrease the efficiency of cardiac contraction and contribute to the low ejection fraction. Beta blockers counter this inappropriately high sympathetic...

Latin Extended-D is a Unicode block containing Latin characters for phonetic, Mayanist, and Medieval transcription and notation systems. 89 of the characters...

beats include premature atrial contractions, premature ventricular contractions and premature junctional contractions. Supraventricular tachycardias include...

Heart block (HB) is a disorder in the heart's rhythm due to a fault in the natural pacemaker. This is caused by an obstruction – a block – in the electrical...