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.

It is widely believed that activity-dependent modification of synapses is the brain's primary mechanism for learning and memory.

The lack of compaction of these regions is called bookmarking, which is an epigenetic mechanism believed to be important for transmitting to daughter cells the " memory " of which genes were active prior to entry into mitosis.

It is believed that CIAT works by the mechanism of increased neuroplasticity.

Sleep is believed to play a key role in halting trace decay, although the exact mechanism of this is unknown.

The currently accepted mechanism for this is believed to be an epitaxial growth of the liquid crystal layers on the partially aligned polymer chains in the near surface layers of the polyimide.

Foreshadowing his later ideas, he believed price controls interfered with an essential signaling mechanism to help resources be used where they were most valued.

Tumulty and Edith believed that an official communication from Wilson's staff on his condition would allow Marshall to trigger the constitutional mechanism allowing him to become acting president, and made sure no such communication occurred.

While the complete mechanism of catalase is not currently known, the reaction is believed to occur in two stages:

The Higgs mechanism is believed to give rise to the masses of all the elementary particles in the Standard Model.

Generally the Eddington valve mechanism for pulsating variables is believed to account for cepheid-like pulsations: a certain helium layer of the star has variable opacity depending on the ionization degree, greater opacity for the greater level of ionization.

Classical Cepheids, Type II Cepheids, RR Lyrae variables and Delta Scutis belong to the instability strip which is believed to be driven by Eddington pulsations in helium, while for the Beta Cepheids the pulsation mechanism is unknown.

The mechanism of reduction was formerly thought to involve a peroxide intermediate, which was believed to lead to superoxide production.

The mechanism of these effects is not clear although it is widely believed to reflect changes in synaptic efficacy akin to long-term potentiation ( LTP ) and long-term depression ( LTD ).

Though it is often believed Fozzie's name is a play on Frank Oz ( F. Oz ), he was actually named after Faz Fazakas, the person who created the mechanism that allowed Fozzie to wiggle his ears.

The mechanism is believed to be due to the effect of temperature and the evidence to support this association is strong.

The St John's wort mechanism is believed to involve inhibition of serotonin ( 5 ‑ HT ) reuptake, much like the conventional selective serotonin reuptake inhibitor ( SSRI ) antidepressants.

Especially after his move to the United States, Osho became increasingly critical of homosexuality and also believed that homosexuality created or caused AIDS, though it is unclear what he believed about the concrete biological mechanism by which a sexual orientation may create a contagious virus.

Though he introduced many successful ideas to strengthen the legal success of the abolitionist cause, this mechanism which he believed to be " the only effective means to prevent British colonists from illicitly importing African slaves " was never taken up.

It is believed that the jaws evolved from anterior gill support arches that had acquired a new role, being modified to pump water over the gills by opening and closing the mouth more effectively — the buccal pump mechanism.

Regulation is believed to rely on a feed-back mechanism measuring blood oxygenation.

Spencer believed that this evolutionary mechanism was also necessary to explain ' higher ' evolution, especially the social development of humanity.