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Related Concept Videos

Calmodulin-dependent Signaling01:16

Calmodulin-dependent Signaling

Calmodulin (CaM) is a calcium-binding protein in eukaryotes that controls various calcium-regulated cellular processes. It has four calcium-binding sites that bind calcium to form the calcium-calmodulin ( Ca2+-CaM) complex. GPCR stimulation increases the calcium levels in the cells that bind to CaM and induces a conformational change.
The Ca2+-CaM complex does not have enzymatic activity by itself. Instead, the complex binds downstream target proteins, including membrane proteins or enzymes,...
Factors Affecting Solubility04:01

Factors Affecting Solubility

Compared with pure water, the solubility of an ionic compound is less in aqueous solutions containing a common ion (one also produced by dissolution of the ionic compound). This is an example of a phenomenon known as the common ion effect, which is a consequence of the law of mass action that may be explained using Le Chȃtelier’s principle. Consider the dissolution of silver iodide:
Washing, Drying, and Ignition of Precipitates00:52

Washing, Drying, and Ignition of Precipitates

After filtration, the precipitate is washed to remove coprecipitated impurities and any remaining mother liquor. Colloidal precipitates, such as silver chloride, are washed with an electrolyte (such as dilute nitric acid) to prevent the peptization of the precipitate. In the case of slightly soluble precipitates, the wash solution contains a common ion to reduce solubility. Lead sulfate, which is slightly soluble in water, is washed with dilute sulfuric acid. Similarly, wash solutions may be...
Qualitative Analysis03:46

Qualitative Analysis

For solutions containing mixtures of different cations, the identity of each cation can be determined by qualitative analysis. This technique involves a series of selective precipitations with different chemical reagents, each reaction producing a characteristic precipitate for a specific group of cations. Metal ions within a group are further separated by varying the pH, heating the mixture to redissolve a precipitate, or adding other reagents to form complex ions.
For instance, group IV...
Synthesis and Functions of Calcitonin00:51

Synthesis and Functions of Calcitonin

Calcitonin, a vital polypeptide hormone, regulates calcium levels within body fluids. It is released by the parafollicular cells, also known as C cells, situated in the follicular epithelium of the thyroid gland. Calcitonin responds to fluctuations in blood calcium levels and the influence of gastrointestinal hormones like gastrin and cholecystokinin.
The exact mechanisms by which calcitonin operates in calcium homeostasis remain elusive, but its significance is evident in several vital...
Skeleton and Calcium Homeostasis01:21

Skeleton and Calcium Homeostasis

Calcium is not only the most abundant mineral in bone but also the most abundant mineral in the human body. Calcium ions are needed for bone mineralization, tooth health, heart rate regulation and strength of contraction, blood coagulation, the contraction of smooth and skeletal muscle cells, and the regulation of nerve impulse conduction. The average calcium level in the blood is about 10 mg/dL. When the body cannot maintain this level, a person will experience hypo or hypercalcemia.

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Related Experiment Video

Updated: Jun 9, 2026

Pull-down of Calmodulin-binding Proteins
07:51

Pull-down of Calmodulin-binding Proteins

Published on: January 23, 2012

[Processing mechanism of calamine].

Lingjun Zhou1, Chunlei Xu, Li Zhang

  • 1College of Pharmacy, Jiangsu Key Laboratory for Traditional Chinese Medicine Formulae Research, Nanjing University of Chinese Medicine, Nanjing 210046, China. lark.zlj@163.com

Zhongguo Zhong Yao Za Zhi = Zhongguo Zhongyao Zazhi = China Journal of Chinese Materia Medica
|September 7, 2010
PubMed
Summary

Calcining calamine at 700°C transforms zinc carbonate into zinc oxide (ZnO), enhancing its antibacterial properties and reducing particle size. This processing improves calamine

More Related Videos

Calcium Carbonate Formation in the Presence of Biopolymeric Additives
09:31

Calcium Carbonate Formation in the Presence of Biopolymeric Additives

Published on: May 14, 2019

Related Experiment Videos

Last Updated: Jun 9, 2026

Pull-down of Calmodulin-binding Proteins
07:51

Pull-down of Calmodulin-binding Proteins

Published on: January 23, 2012

Calcium Carbonate Formation in the Presence of Biopolymeric Additives
09:31

Calcium Carbonate Formation in the Presence of Biopolymeric Additives

Published on: May 14, 2019

Area of Science:

  • Mineralogy and Materials Science
  • Pharmacology and Toxicology

Context:

  • Calamine, a traditional remedy, requires optimized processing for enhanced efficacy.
  • Understanding the transformation of calamine components is crucial for its pharmaceutical application.

Purpose:

  • To investigate the structural and compositional changes in calamine during thermal processing.
  • To evaluate the antibacterial activity of original and processed calamine.

Summary:

  • Calcination at 700°C for 1 hour converts original calamine (zinc carbonate) into zinc oxide (ZnO).
  • Processed calamine exhibits smaller particle size, improved dimensional uniformity, and reduced impurities.
  • Both original and calcined calamine, containing zinc compounds, demonstrate antibacterial activity, with processed calamine showing superior results.

Impact:

  • The study provides insights into optimizing calamine processing for improved therapeutic outcomes.
  • Enhanced calamine formulations could lead to more effective antibacterial treatments.
  • This research contributes to the scientific understanding of traditional medicines and their modern applications.