The precise mechanism for organification of iodine in the thyroid is not as yet completely understood.

It is not clear whether this system bears any resemblance to the in vivo iodinating mechanism, and a system generating peroxide has not been identified in thyroid tissue.

Since the circulating thyroid hormones are the amino acids thyroxine and tri-iodothyronine ( cf. Section C ), it is clear that some mechanism must exist in the thyroid gland for their release from proteins before secretion.

It is believed that drug therapy and electroshock involve the former and psychotherapy the latter mechanism.

there is no mechanism for keeping the volumes up to date.

Also, it can be readily seen that the cutting and peeling types of failure show a steady state response, while the cracking mechanism is of a dynamic nature.

The basic difference between the continuous cutting mechanism and that of the chipping mechanism is that instead of shear occurring in the coating ahead of the knife continuously without fracture, rupture intermittently occurs along the shear plane.

If a substitute mechanism is needed for the control of a fictitious impersonal market, quite obviously some method must be devised for representing the public interest.

Sorghum is believed to have the same tolerance mechanism.

They have not been expelled or suspended, since there is no mechanism in this voluntary association to suspend or expel an independent province of the Communion.

This might indicate that anxiety is a protective mechanism designed to prevent the organism from engaging in potentially harmful behaviors.

When a molten metal is mixed with another substance, there are two mechanisms that can cause an alloy to form, called atom exchange and the interstitial mechanism.

With the interstitial mechanism, one atom is usually much smaller than the other, so cannot successfully replace an atom in the crystals of the base metal.

While the mechanism is not fully understood, it is likely to involve the production of electron – positron pairs, as ordinary matter gains tremendous energy while falling into a stellar remnant .< ref >

The merger is the mechanism by which the players compete.

Quantum nonlocality is often proposed as a mechanism for superluminal communication.

Furthermore, there is no proposed mechanism of action by which the positions and motions of stars and planets could affect people and events on Earth that does not contradict well understood, basic aspects of biology and physics.

The exact mechanism of action of paracetamol / acetaminophen is uncertain, but it appears to be acting centrally rather than peripherally ( in the brain rather than in nerve endings ).

The exact mechanism of carbamazepine, gabapentin and pregabalin is similarly unclear, but these anticonvulsants are used to treat neuropathic pain with differing degrees of success.

Using this binding mechanism, an antibody can tag a microbe or an infected cell for attack by other parts of the immune system, or can neutralize its target directly ( for example, by blocking a part of a microbe that is essential for its invasion and survival ).

The proposed mechanism of chronic nicotine causing desensitisation of nicotinic receptors, thereby leading to an antidepressant effect, is consistent with the theory first proposed over 30 years ago and subsequent research that confirmed excessive acetylcholine activity in the brain leads to depressive symptoms.

Many pathways and signals lead to apoptosis, but there is only one mechanism that actually causes the death of a cell.

ATM traffic contracts form part of the mechanism by which " quality of service " ( QoS ) is ensured.

Even with a release aid mechanism some of this effect will usually be experienced, since the string always accelerates faster than the retaining part of the mechanism.

Divalent cations ( usually Mg ) are generally required and appear to be closely involved in the enzymatic mechanism.

The game includes a mechanism for determining how damaged a character's sanity is at any given point ; encountering the horrific beings usually triggers a loss of SAN points.

Ion exchange chromatography ( usually referred to as ion chromatography ) uses an ion exchange mechanism to separate analytes based on their respective charges.

Chapter 11 usually results in reorganization of the debtor's business or personal assets and debts, but can also be used as a mechanism for liquidation.

A disk drive is a device implementing such a storage mechanism with fixed or removable media ; with removable media the device is usually distinguished from the media as in compact disc drive and the compact disc.

In contrast to games such as Risk or Monopoly, in which a close game can extend indefinitely, German-style games usually have a mechanism to stop the game within its stated playing time.

This is usually done by having a set of jacks for each choir, and a mechanism for " turning off " each set, often by moving the upper register ( through which the jacks slide ) sideways a short distance, so that their plectra miss the strings.

An important leading mechanism is the Lead's left hand, which usually holds the Follow's right hand.

Inter-process communication ( IPC ) is any mechanism which allows separate processes to communicate with each other, usually by sending messages.

Shared memory is strictly speaking also an inter-process communication mechanism, but the abbreviation IPC usually only refers to message passing, and it is the latter that is particularly relevant to microkernels.

* Encryption systems usually require some synchronization mechanism to ensure that the receiving cipher is decoding the right bits at the right time.

However, this is difficult to measure, and there is usually debate over the actual mechanism of alleged fortis or lenis consonants.

Although a large amount of research has been carried out, the exact mechanism of action of ECT remains elusive, and ECT on its own does not usually have a sustained benefit.

The term can legitimately refer to any form of psychotherapy when delivered in a group format, including Cognitive behavioural therapy or Interpersonal therapy, but it is usually applied to psychodynamic group therapy where the group context and group process is explicitly utilised as a mechanism of change by developing, exploring and examining interpersonal relationships within the group.

Ground propulsion is any mechanism for propelling solid bodies along the ground, usually for the purposes of transportation.

The bit is height-adjustable to allow protrusion through an opening in a flat sole plate, usually via adjusting the motor-mounting height ( the mechanism of adjustment is widely varied among manufacturers ).

The hilt usually had quillons modified to accommodate the gun barrel, and a hilt mechanism that enabled the bayonet to be attached to a bayonet lug.

When both the term baseline and either of label or tag are used together in the same context, label and tag usually refer to the mechanism within the tool of identifying or making the record of the snapshot, and baseline indicates the increased significance of any given label or tag.

In modern usage, balloon refers to any buoyant aircraft that generally relies on wind currents for horizontal movement, and usually has a mechanism to control vertical movement.

The brake pads must usually be replaced regularly ( depending on pad material ), and some are equipped with a mechanism that alerts drivers that replacement is needed, such as a thin piece of soft metal that rubs against the disc when the pads are too thin causing the brakes to squeal, a soft metal tab embedded in the pad material that closes an electric circuit and lights a warning light when the brake pad gets thin, or an electronic sensor.

Since data could be in one of three memory spaces, a mechanism is usually provided to allow determining to which memory a pointer refers, either by constraining the pointer type to include the memory space, or by storing metadata with the pointer.