Everything below concerns research chemical. We keep the language plain, cite what the science says, and separate well-supported claims from open questions.
Updated 2025-11-30. Numbers and descriptions here follow the published literature rather than marketing material.
Published research on the compound remains limited. Much of the human data comes from small, early-stage studies rather than large controlled trials, and several questions about effects and variability between individuals remain open. Investigators have examined receptor activity, pigment pathways, and related physiological responses in laboratory and animal models. Findings from those models do not automatically translate to human outcomes. Reviews frequently note the scarcity of rigorous clinical evidence and call for better-characterized study material.
Because the substance circulates mainly through informal markets, verification is a recurring theme in technical discussion. Independent analyses have found that labeled content and actual content can diverge, and that purity varies between samples. Analytical laboratories use reversed-phase chromatography to separate components and mass spectrometry to confirm identity. Isotope-labeled internal standards improve quantification in complex matrices. Such methods describe what a sample contains but say nothing about its sterility, lawful status, or suitability for any use. Open questions remain about how consistently testing is applied across the supply chain.
Regulatory treatment of this peptide varies by country. It holds no marketing authorization as a medicine in the United States, the European Union, or most other jurisdictions. Some countries classify products containing it as prescription-only or unlicensed medicines, which restricts lawful supply. Authorities have issued public notices warning that unregulated products may contain undeclared or incorrect ingredients. The molecule also appears on prohibited lists for competitive sport. These measures address supply oversight rather than any approved therapeutic role.
Regulatory treatment varies by country. In the United States, melanotan-2 is not approved for any indication, and products marketed for human use fall outside the approved drug framework. Some other jurisdictions have placed it under prescription controls or listed it as a prohibited or restricted substance. Online listings frequently describe the material as a research chemical, a category that does not carry the same manufacturing and labelling requirements as approved medicines.
Solid peptide material is generally stable when kept cold and dry. Common practice is storage at -20 degrees Celsius or lower, with desiccant and protection from light. Repeated freeze-thaw cycles and exposure to moisture are associated with degradation, aggregation, or loss of material. Once dissolved, stability depends on solvent, concentration, and temperature, and solutions are usually treated as short-lived unless stability data support longer periods. Handling notes typically emphasise minimising time at ambient temperature.
Identity and purity are assessed with chromatographic and mass spectrometric techniques. Reversed-phase high-performance liquid chromatography separates the target peptide from related impurities and degradation products, and the resulting retention time is compared against a reference standard. Mass spectrometry, often coupled to liquid chromatography, confirms molecular mass. Amino acid analysis or peptide mapping can provide additional sequence-level confirmation when required. Results are only as reliable as the reference materials used alongside them.
| Property | Value | Notes |
|---|---|---|
| Regulatory status | Not approved as a medicine | No marketing authorization in major jurisdictions |
| Scheduling example | Prescription-only supply in some countries | Handled as an unlicensed medicine where restricted |
| Sports classification | Prohibited peptide | Appears on anti-doping prohibited lists |
| Reported presentation | Lyophilized vial | Nominal content varies between vendors |
| Detection approach | Liquid chromatography–tandem mass spectrometry | Used in anti-doping and forensic testing |
Melanotan-2 appears on the World Anti-Doping Agency prohibited list within the peptide hormone class, and several national regulators treat it as an unapproved prescription substance. Some countries restrict importation or sale for personal use. Because the compound is widely traded as a research chemical, the practical legal picture differs between jurisdictions and shifts over time. Human safety data covering long periods are limited, and whether repeated pigmentation changes carry any lasting risk to melanocytes remains an open question.
Freeze-dried melanotan-2 is normally kept as a desiccated powder at minus twenty degrees Celsius or lower, shielded from light and moisture. Peptides of this size degrade through hydrolysis, oxidation and deamidation, and each pathway accelerates as temperature and water activity rise. Repeated freeze-thaw cycles promote aggregation and loss of material, so aliquoting a stock solution before freezing is standard laboratory practice. Once dissolved, the solution is markedly less stable than the powder. In laboratory work, solutions are generally refrigerated and used within days rather than kept for months.
Regulatory treatment varies by country. In the United States the peptide is not approved as a medicine, and products offered for human use may be treated as unapproved new drugs; some states also restrict sale. Australia, the United Kingdom, and European Union member states apply comparable restrictions to unapproved peptide products. Border agencies have seized shipments labelled as research chemicals. Classification may change over time, and the legal position for personal importation is not clearly settled in most published guidance.
Lyophilised melanotan-2 is supplied as a solid, which is more stable than a solution. The material is hygroscopic, so weighing is done quickly, in low humidity, with the container kept sealed. Reconstitution usually uses water for injection or bacteriostatic water, added down the wall of the vial to limit foaming. A reconstituted solution is held at 2 to 8 °C and kept away from light. Repeated freezing and thawing of the same vial is avoided because ice crystal formation and concentration effects degrade the peptide.
Reversed-phase high-performance liquid chromatography is the routine method for purity assessment. Peptides absorb near 214 nm because of the peptide bond, and a gradient of acetonitrile in water separates the intact peptide from deletion sequences, oxidised products, and earlier-eluting fragments at neutral pH. Electrospray ionisation mass spectrometry provides an orthogonal check: the measured mass must agree with the theoretical value. Amino acid analysis and peptide mapping confirm structure but are used less often. Reference standards remain scarce because the peptide is not described in any pharmacopoeia.
== Detection limits and sample degradation == Detection limits for most trace elements are between 1012 and 1016 atoms per cubic centimetre, depending on the type of instrumentation used, the primary ion beam used, the analytical area, and other factors. Samples as small as individual pollen grains and microfossils can yield results by this technique. The amount of surface cratering created by the process depends on the current (pulsed or continuous) and dimensions of the primary ion beam. While only charged secondary ions emitted from the material surface through the sputtering process are used to analyze the chemical composition of the material, these represent a small fraction of the particles emitted from the sample.
Meats, poultry and fish all must be kept in climate-controlled environments before being sold. Refrigeration also helps keep fruits and vegetables edible longer. One of the most influential uses of refrigeration was in the development of the sushi/sashimi industry in Japan. Before the discovery of refrigeration, many sushi connoisseurs were at risk of contracting diseases. The dangers of unrefrigerated sashimi were not brought to light for decades due to the lack of research and healthcare distribution across rural Japan. Around mid-century, the Zojirushi corporation, based in Kyoto, made breakthroughs in refrigerator designs, making refrigerators cheaper and more accessible for restaurant proprietors and the general public.
The process of artificial or 'oven' drying consists basically of introducing heat. This may be achieved directly, using natural gas and/or electricity, or indirectly, through steam-heated heat exchangers. Solar energy is also an option. In the process, deliberate control of temperature, relative humidity and air circulation creates variable conditions to achieve specific drying profiles. To achieve this, the timber is stacked in chambers that are fitted with equipment to control atmospheric temperature, relative humidity and circulation rate. Chamber drying provides a means of overcoming the limitations imposed by erratic weather conditions. With kiln drying, as is the case with air drying, unsaturated air is used as the drying medium. Almost all commercial timbers of the world are dried in industrial kilns. A comparison of air drying, conventional kiln and solar drying is given below:
The liquid containing the analytes of interest (typically 10−6 - 10−4 M needed ) is dispersed by electrospray, into a fine aerosol. Because the ion formation involves extensive solvent evaporation (also termed desolvation), the typical solvents for electrospray ionization are prepared by mixing water with volatile organic compounds (e.g. methanol acetonitrile). To decrease the initial droplet size, compounds that increase the conductivity (e.g. acetic acid) are customarily added to the solution. These species also act to provide a source of protons to facilitate the ionization process. Large-flow electrosprays can benefit from nebulization of a heated inert gas such as nitrogen or carbon dioxide in addition to the high temperature of the ESI source. The aerosol is sampled into the first vacuum stage of a mass spectrometer through a capillary carrying a potential difference of approximately 3000 V, which can be heated to aid further solvent evaporation from the charged droplets. The solvent evaporates from a charged droplet until it becomes unstable upon reaching its Rayleigh limit. At this point, the droplet deforms as the electrostatic repulsion of like charges, in an ever-decreasing droplet size, becomes more powerful than the surface tension holding the droplet together. At this point the droplet undergoes Coulomb fission, whereby the original droplet 'explodes' creating many smaller, more stable droplets. The new droplets undergo desolvation and subsequently further Coulomb fissions.
== Terminology == In 1901, Jōkichi Takamine patented a purified extract from the adrenal glands, which was trademarked by Parke, Davis & Co in the US. The British Approved Name and European Pharmacopoeia term for this drug is hence adrenaline (from Latin ad, "on", and rēnālis, "of the kidney", from ren, "kidney"). However, the pharmacologist John Abel had already prepared an extract from adrenal glands as early as 1897, and he coined the name epinephrine to describe it (from Ancient Greek ἐπῐ́ (epí), "upon", and νεφρός (nephrós), "kidney"). As the term Adrenaline was a registered trademark in the US, and in the belief that Abel's extract was the same as Takamine's (a belief since disputed), epinephrine instead became the generic name used in the US and remains the pharmaceutical's United States Adopted Name and International Nonproprietary Name (though the name adrenaline is frequently used). The terminology is now one of the few differences between the INN and BAN systems of names. Although European health professionals and scientists preferentially use the term adrenaline, the converse is true among American health professionals and scientists. Nevertheless, even among the latter, receptors for this substance are called adrenergic receptors or adrenoceptors, and pharmaceuticals that mimic its effects are often called adrenergics. The history of adrenaline and epinephrine is reviewed by Rao.
Sources: en.wikipedia.org
The field of plastic surgery was brought to Europe, specifically Catania, in the fifteenth century, when Gustavo Branca successfully completed an ancient Indian method of reconstructive rhinoplasty. Plastic surgery continued to grow as a field across the continent, and the birth of this field is likely related to nose amputation as punishment.
Many other organisms obtained chloroplasts from the primary chloroplast lineages through secondary endosymbiosis—engulfing a red or green alga with a primary chloroplast. These chloroplasts are known as secondary plastids. As a result of the secondary endosymbiotic event, secondary chloroplasts have additional membranes outside of the original two in primary chloroplasts. In secondary plastids, typically only the chloroplast, and sometimes its cell membrane and nucleus remain, forming a chloroplast with three or four membranes—the two cyanobacterial membranes, sometimes the eaten alga's cell membrane, and the phagosomal vacuole from the host's cell membrane. The genes in the phagocytosed eukaryotes nucleus are often transferred to the secondary host's nucleus. Cryptomonas and chlorarachniophytes retain the phagocytosed eukaryotes nucleus, an object called a nucleomorph, located between the second and third membranes of the chloroplast. All secondary chloroplasts come from green and red algae. No secondary chloroplasts from glaucophytes have been observed, probably because glaucophytes are relatively rare in nature, making them less likely to have been taken up by another eukaryote. Still other organisms, including the dinoflagellates Karlodinium and Karenia, obtained chloroplasts by engulfing an organism with a secondary plastid. These are called tertiary plastids.
The first reference in the literature to a commercially available protein A chromatography resin appeared in 1976. Today, chromatographic separation using protein A immobilized on porous substrates is the most widely established method for purifying monoclonal antibodies (mAbs) from harvest cell culture supernatant. The choice of protein A as the preferred method is due to the high purity and yield which are easily and reliably achieved. This forms the basis for a general antibody purification "platform" which simplifies manufacturing operations and reduces the time and effort required to develop purification processes. A typical mAb purification process is shown at right. Albeit the long history of protein A chromatography for the production of antibodies, the process is still being improved today. Continuous chromatography, more precisely periodic counter-current chromatography, enormously increases the productivity of the purification step.
In 1957, Berni Alder and Thomas Wainwright used an IBM 704 computer to simulate perfectly elastic collisions between hard spheres. In 1960, in perhaps the first realistic simulation of matter, J.B. Gibson et al. simulated radiation damage of solid copper by using a Born–Mayer type of repulsive interaction along with a cohesive surface force. In 1964, Aneesur Rahman published simulations of liquid argon that used a Lennard-Jones potential; calculations of system properties, such as the coefficient of self-diffusion, compared well with experimental data. Today, the Lennard-Jones potential is still one of the most frequently used intermolecular potentials. It is used for describing simple substances (a.k.a. Lennard-Jonesium) for conceptual and model studies and as a building block in many force fields of real substances.
== Further reading == Aikin, Jane (2010). "Histories of the Library of Congress". Libraries & the Cultural Record. 45 (1): 5–24. doi:10.1353/lac.0.0113. S2CID 161865550. Anderson, Gillian B. (1989), "Putting the Experience of the World at the Nation's Command: Music at the Library of Congress, 1800–1917", Journal of the American Musicological Society, 42 (1): 108–49, doi:10.2307/831419, JSTOR 831419 Bisbort, Alan, and Linda Barrett Osborne. The Nation's Library: The Library of Congress, Washington, D. C. (Library of Congress, 2000) Cole, John Young. Jefferson's legacy: a brief history of the Library of Congress (Library of Congress, 1993) Cole, John Young. "The library of congress becomes a world library, 1815–2005." Libraries & culture (2005) 40#3: 385–398. in Project MUSE Cope, R. L. "Management Review of the Library of Congress: The 1996 Booz Allen & Hamilton Report," Australian Academic & Research Libraries (1997) 28#1 online Mearns, David Chambers. The Story Up to Now: The Library of Congress, 1800–1946 (1947), detailed narrative Ostrowski, Carl. Books, Maps, and Politics: A Cultural History of the Library of Congress, 1783–1861 (2004) Rosenberg, Jane Aiken. The Nation's Great Library: Herbert Putnam and the Library of Congress, 1899–1939 (University of Illinois Press, 1993) Shevlin, Eleanor F.; Lindquist, Eric N. (2010). "The Center for the Book and the History of the Book". Libraries & the Cultural Record. 45 (1): 56–69. doi:10.1353/lac.0.0112. S2CID 161311744. Tabb, Winston; et al. (2003). "Library of Congress". Encyclopedia of Library and Information Science.
Sources: en.wikipedia.org
=== Anti-inflammatory and analgesic agents === Glucocorticoids can be used in the short term and at the lowest dose possible for flare-ups and while waiting for slow-onset drugs to take effect. Combination of glucocorticoids and conventional therapy has shown a decrease in rate of erosion of bones. Steroids may be injected into affected joints during the initial period of RA, before the use of DMARDs or oral steroids. Non-NSAID drugs to relieve pain, like paracetamol may be used to help alleviate the pain symptoms; they do not change the underlying disease. The use of paracetamol may be associated with the risk of developing ulcers. NSAIDs reduce both pain and stiffness in those with RA but do not affect the underlying disease and appear to have no effect on people's long term disease course and thus are no longer first line agents. NSAIDs should be used with caution in those with gastrointestinal, cardiovascular, or kidney problems. Rofecoxib was withdrawn from the global market as its long-term use was associated to an increased risk of heart attacks and strokes. Use of methotrexate together with NSAIDs is safe, if adequate monitoring is done. COX-2 inhibitors, such as celecoxib, and NSAIDs are equally effective. A 2004 Cochrane review found that people preferred NSAIDs over paracetamol. However, it is yet to be clinically determined whether NSAIDs are more effective than paracetamol. The neuromodulator agents, topical capsaicin, may be reasonable to use in an attempt to reduce pain.
Low neutrophil counts are termed neutropenia. This can be congenital (developed at or before birth) or it can develop later, as in the case of aplastic anemia or some kinds of leukemia. It can also be a side-effect of medication, most prominently chemotherapy. Neutropenia makes an individual highly susceptible to infections. It can also be the result of colonization by intracellular neutrophilic parasites. In alpha 1-antitrypsin deficiency, the important neutrophil elastase is not adequately inhibited by alpha 1-antitrypsin, leading to excessive tissue damage in the presence of inflammation – the most prominent one being emphysema. Negative effects of elastase have also been shown in cases when the neutrophils are excessively activated (in otherwise healthy individuals) and release the enzyme in extracellular space. Unregulated activity of neutrophil elastase can lead to disruption of pulmonary barrier showing symptoms corresponding with acute lung injury. The enzyme also influences activity of macrophages by cleaving their toll-like receptors (TLRs) and downregulating cytokine expression by inhibiting nuclear translocation of NF-κB. In Familial Mediterranean fever (FMF), a mutation in the pyrin (or marenostrin) gene, which is expressed mainly in neutrophil granulocytes, leads to a constitutively active acute-phase response and causes attacks of fever, arthralgia, peritonitis, and – eventually – amyloidosis. Hyperglycemia can lead to neutrophil dysfunction.
There are numerous methods employed for fiber-typing, and confusion between the methods is common among non-experts. Two commonly confused methods are histochemical staining for myosin ATPase activity and immunohistochemical staining for myosin heavy chain (MHC) type. Myosin ATPase activity is commonly—and correctly—referred to as simply "fiber type", and results from the direct assaying of ATPase activity under various conditions (e.g. pH). Myosin heavy chain staining is most accurately referred to as "MHC fiber type", e.g. "MHC IIa fibers", and results from determination of different MHC isoforms. These methods are closely related physiologically, as the MHC type is the primary determinant of ATPase activity. However, neither of these typing methods is directly metabolic in nature; they do not directly address oxidative or glycolytic capacity of the fiber. When "type I" or "type II" fibers are referred to generically, this most accurately refers to the sum of numerical fiber types (I vs. II) as assessed by myosin ATPase activity staining (e.g. "type II" fibers refers to type IIA + type IIAX + type IIXA ... etc.). Below is a table showing the relationship between these two methods, limited to fiber types found in humans. Subtype capitalization is used in fiber typing vs. MHC typing, and some ATPase types actually contain multiple MHC types. Also, a subtype B or b is not expressed in humans by either method. Early researchers believed humans to express a MHC IIb, which led to the ATPase classification of IIB.
In their discovery of elements 99 and 100, the American teams had competed with a group at the Nobel Institute for Physics, Stockholm, Sweden. In late 1953 to early 1954, the Swedish group succeeded in synthesizing light isotopes of element 100, in particular 250Fm, by bombarding uranium with oxygen nuclei. These results were also published in 1954. Nevertheless, the priority of the Berkeley team was generally recognized, as its publications preceded the Swedish article, and they were based on the previously undisclosed results of the 1952 thermonuclear explosion; thus the Berkeley team was given the privilege to name the new elements. As the effort which had led to the design of Ivy Mike was codenamed Project PANDA, element 99 had been jokingly nicknamed "Pandemonium" but the official names suggested by the Berkeley group derived from two prominent scientists, Einstein and Fermi: "We suggest for the name for the element with the atomic number 99, einsteinium (symbol E) after Albert Einstein and for the name for the element with atomic number 100, fermium (symbol Fm), after Enrico Fermi." Both Einstein and Fermi died between the time the names were originally proposed and when they were announced. The discovery of these new elements was announced by Albert Ghiorso at the first Geneva Atomic Conference held on 8–20 August 1955. The symbol for einsteinium was first given as "E" and later changed to "Es" by IUPAC.
=== Everyone, Wherever You Are, Come One Step Closer (2022) === In 2022, Kermani published his most successful religion-related book to date, with the programmatic title: Everyone, Wherever You Are, Come One Step Closer. It is written as an address to Kermani's daughter. Responding to her questions about God and religion, the book offers an excellent introduction to faith for young people. While Kermani mainly focuses on Islam and explains many of the specifics of this religion, his mystical approach to religion offers a great deal of relatable content for people of all faiths. The book's detailed analysis of modern physics as a form of contemporary adaptation of traditional beliefs is striking, and the book succeeds in offering a complex and thoroughly thought-out understanding of religion in a humorous and accessible style.
Sources: en.wikipedia.org
Only a small number of early-stage human studies have been reported, and most were limited in size and duration. No large late-stage program has established a general efficacy or safety profile. The evidence base is therefore thin compared with approved medicines.
The peptide is listed as prohibited in competitive sport, so laboratories develop detection methods and monitor for its presence. Its appearance in enforcement reports reflects that classification rather than any approved athletic use. Analytical work in this area focuses on identifying the molecule and its breakdown products in biological samples.
Chromatographic separation combined with mass spectrometry identifies the peptide and estimates its amount in a sample. Testing can confirm whether the expected molecule is present and at what concentration. It cannot establish how a product was manufactured or whether it meets any purity standard.
Laboratory confirmation typically combines retention time matching on a chromatographic system with mass measurement. A reference standard of known identity is needed for a meaningful comparison. Sequence-level techniques can add further confirmation.