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Related Concept Videos

Redox Titration: Iodimetry and Iodometry01:23

Redox Titration: Iodimetry and Iodometry

Iodometry and iodimetry are analytical methods used to determine the concentration of oxidizing or reducing agents using iodine. In iodometric titrations, the oxidizing analyte solution is usually acidified and treated with an excess of iodide ions, which generates an equivalent amount of iodine in equilibrium with triiodide. The released iodine is subsequently titrated directly against a standardized reducing agent. As the dilute iodine color becomes pale yellow, a few drops of freshly...
Goiter01:27

Goiter

Goiter refers to an abnormal enlargement of the thyroid gland that may appear as a diffuse goiter (uniform enlargement) or nodular (single or multiple nodules). Functionally, it is classified as nontoxic (normal/low hormone levels) or toxic (excess hormone production).PathophysiologyDiffuse thyroid enlargement typically results from prolonged stimulation by thyroid-stimulating hormone (TSH) or TSH-like agents, commonly seen in hypothyroidism or iodine deficiency. In contrast, in hyperthyroid...
Synthesis and Regulation of Thyroid Hormones01:20

Synthesis and Regulation of Thyroid Hormones

Low blood levels of the thyroid hormones — triiodothyronine (T3) and thyroxine (T4) — signal the hypothalamus to release the thyrotropin-releasing hormone (TRH). TRH then reaches the pituitary gland and stimulates the release of thyroid-stimulating hormone(TSH) into the bloodstream.
Upon reaching the thyroid gland, TSH stimulates the follicular cells' active uptake of iodide ions from the blood. The ions diffuse to the apical surface of the cells and are oxidized to iodine. The iodine is then...
Redox Titration: Overview01:21

Redox Titration: Overview

Redox titration is a chemical analysis technique used to determine the concentration of an unknown substance by measuring the electron transfer in a redox (reduction-oxidation) reaction. The process involves gradually adding a titrant with a known concentration of an oxidizing or reducing agent, to the analyte, the solution with an unknown concentration, until reaching the endpoint, which indicates the completion of the reaction between the two substances. Ensuring the analyte is in a single...
Hyperthyroidism I: Introduction01:25

Hyperthyroidism I: Introduction

Hyperthyroidism is a type of thyrotoxicosis characterized by the thyroid gland's overproduction of the thyroid hormones triiodothyronine (T3) and thyroxine (T4). This hormone excess increases the basal metabolic rate and enhances sensitivity to catecholamines.DiagnosisDiagnosis is based on clinical features and biochemical testing. It typically shows suppressed thyroid-stimulating hormone (TSH) levels below 0.4 mIU/L, with elevated free T3 and/or T4. Additional tests, including thyroid...
Hypothyroidism II: Pathophysiology01:23

Hypothyroidism II: Pathophysiology

Hypothyroidism is a disorder characterized by insufficient production of thyroid hormones, which regulate metabolism, energy balance, and multiple organ systems.TypesHypothyroidism is classified based on the level of dysfunction. Primary hypothyroidism results from intrinsic thyroid gland dysfunction, causing reduced hormone production despite normal or increased stimulation. Secondary hypothyroidism arises from inadequate thyroid-stimulating hormone (TSH) secretion by the pituitary. Tertiary...

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Related Experiment Videos

Update on iodine status worldwide.

Michael B Zimmermann1, Maria Andersson

  • 1Human Nutrition Laboratory, Institute of Food, Nutrition, and Health, ETH Zurich, Switzerland. michael.zimmermann@hest.ethz.ch

Current Opinion in Endocrinology, Diabetes, and Obesity
|August 16, 2012
PubMed
Summary
This summary is machine-generated.

Global salt iodization programs aim to prevent iodine deficiency. In 2012, about 70% of households had access to iodized salt, yet 32 countries showed iodine deficiency, impacting 246 million children.

Related Experiment Videos

Area of Science:

  • Public Health Nutrition
  • Global Health
  • Endocrinology

Background:

  • Salt iodization is a key public health strategy to combat iodine deficiency disorders worldwide.
  • Assessing iodine status relies on household adequately iodized salt (HHIS) coverage and urinary iodine concentrations (UICs).

Purpose of the Study:

  • To evaluate the global and regional iodine nutritional status in 2012.
  • To analyze data using both HHIS and UIC indicators.

Main Methods:

  • Utilized UNICEF data for national HHIS coverage.
  • Conducted a systematic literature search for UIC data, including school-aged children.
  • Employed median UIC for national status classification and UIC distribution for estimating inadequate iodine intake.

Main Results:

  • 32 countries exhibited iodine deficiency based on median UIC.
  • An estimated 29.8% of global school-aged children (246 million) had insufficient iodine intake.
  • While 70% of households globally had access to iodized salt, only 37 countries met the 90% HHIS coverage goal, with 39 below 50%.

Conclusions:

  • Significant progress in salt iodization exists, but coverage remains suboptimal in many regions.
  • Strengthening and expanding iodized salt programs is crucial to address the iodine needs of nearly one-third of the global population.
  • Continued monitoring using both HHIS and UIC is essential for effective iodine deficiency control.