The short version of Synthetic peptide fits in a sentence. The long version — which is the one that helps — is below.
This page was last updated on 2026-01-13 and is reviewed periodically as new material appears.
Dihexa is not approved as a medicine in major regulatory jurisdictions. It is commonly sold as a research chemical for laboratory use, though such products may not be standardized or independently verified. Scientific literature on dihexa includes in vitro assays, rodent studies, and reviews that discuss its proposed mechanism. The distinction between peer-reviewed findings and commercial promotion is important when evaluating available information. Open questions include its precise binding interactions, pharmacokinetics, and whether animal results translate to human biology.
Dihexa is a synthetic peptide derived from angiotensin IV, a naturally occurring fragment of the renin-angiotensin system. Researchers modified the angiotensin IV structure to improve metabolic stability and central nervous system activity. It is frequently described as a hepatocyte growth factor mimetic because it can activate the c-Met receptor pathway in experimental systems. Its development reflects interest in small peptides that influence synaptic plasticity and cognitive processes. Most information comes from preclinical studies rather than controlled human trials.
Identity and purity of dihexa samples are typically assessed with high-performance liquid chromatography and mass spectrometry. These methods can confirm molecular mass and estimate the presence of impurities. However, a certificate of analysis from a supplier is not a guarantee of independent testing. Researchers often require in-house verification before using a peptide in experiments. For solid samples, appearance, solubility, and chromatographic profile provide additional checks. Nuclear magnetic resonance may be used for structural confirmation when available.
Dihexa is commonly handled as a lyophilized powder in laboratory settings. Storage at -20 °C in a desiccated, light-protected container is typical for peptides. Repeated freeze-thaw cycles can degrade the material, so aliquoting is often recommended. Aqueous solutions may be less stable than organic stocks and should be prepared fresh when possible. Personnel should follow institutional safety procedures and avoid uncontrolled exposure. Because human effects are not well characterized, handling precautions are prudent.
| Property | Value | Notes |
|---|---|---|
| Chemical class | Synthetic peptide | Derived from angiotensin IV and modified for stability. |
| Proposed mechanism | c-Met/HGF pathway activation | Described as an HGF mimetic in experimental systems. |
| Common synonyms | Dihexa; N-hexanoic-Tyr-Ile-(6)-aminohexanoic amide | Name usage varies by supplier and publication. |
| Regulatory status | Not approved as a drug | Sold as a research chemical in some markets. |
| Human trial data | Limited or absent | Most evidence comes from preclinical studies. |
Identity checks for dihexa usually rely on mass spectrometry and chromatographic purity analysis. A lyophilized powder is the common supplied form, and it may appear as a white to off-white solid. Aqueous solubility is limited, so laboratory work often uses an organic solvent such as dimethyl sulfoxide to prepare stock solutions. Because the peptide is not a standard pharmaceutical product, exact specifications can vary between suppliers. Certificates of analysis may accompany a batch, but they are not equivalent to regulatory approval.
Dihexa is a synthetic peptide whose structure is modeled on angiotensin IV. Its chemical name often appears as N-hexanoic-Tyr-Ile-(6)-aminohexanoic amide, though vendor and publication naming can differ. The molecule combines a short amino acid sequence with a hexanoic acid group and an amide terminus. It is classed as a small research peptide rather than a conventional drug. Databases may list it under several synonyms, so matching names are important when comparing sources.
The full name often given is N-hexanoic-Tyr-Ile-(6)-aminohexanoic amide. This name indicates a chain containing tyrosine, isoleucine, and a six-carbon amino acid derivative. Databases list a CAS Registry Number and a molecular formula for the compound. The peptide is small compared with proteins, and its structure allows it to be studied in cell cultures and animal models. Exact identity depends on the supplier's synthesis and purification process. Minor impurities can remain after synthesis.
Chemically, dihexa belongs to a broader group of angiotensin IV analogs. Researchers have modified the natural peptide to alter stability, binding, or distribution. Such changes can affect how the molecule behaves in experiments. The parent peptide angiotensin IV is involved in various physiological processes, but the modified analog is not identical to it. Public summaries sometimes blur the distinction between the natural fragment and the synthetic research compound. This distinction matters when interpreting study results.
Dihexa occupies an uncertain regulatory space in many countries. It is not generally listed as an approved therapeutic, and some jurisdictions may treat it as a research chemical, a compounded substance, or an unapproved new drug depending on claims and distribution. Importation can be restricted, and suppliers may require documentation that the material is for laboratory research only. Quality and labeling vary, so buyers should request analytical data, verify lot numbers, and understand local rules. These factors make sourcing and compliance part of the practical context around dihexa.
Lyophilized dihexa is typically stored as a dry powder at or below minus twenty degrees Celsius. Cooler temperatures slow degradation, and desiccant protection limits moisture uptake. Repeated temperature cycling can accelerate breakdown, so aliquoting before storage is common in laboratory practice. Solutions are generally less stable than dry powder and are often kept cold, protected from light, and used within a defined period. Specific stability data for dihexa are limited, and handling recommendations often follow general peptide guidelines rather than compound-specific studies.
Development of dihexa followed from studies on angiotensin IV analogs and their effects on learning and memory. Researchers sought compounds with improved metabolic stability and brain penetration compared with natural peptides. In preclinical reports, dihexa was associated with changes in synaptic connectivity and performance on spatial tasks. These findings generated interest in its potential as a cognitive research tool. The work remains largely preclinical, and independent replication has been limited.
Regulatory and commercial contexts differ from clinical medicine. Dihexa is not approved as a drug by major agencies, and no published human trials establish its safety or efficacy. It is often sold as a research chemical labeled for laboratory use only. Suppliers may provide certificates of analysis, but purity and identity depend on the specific batch. Legal status varies by country and may treat such compounds as unapproved substances for human consumption.
== In iPS cell reprogramming == A number of different cellular processes must take place in order for somatic cells to undergo reprogramming into induced pluripotent stem cells (iPS cells). iPS cell reprogramming, also known as somatic cell reprogramming, can be achieved by ectopic expression of Oct4, Klf4, Sox2, and c-Myc (OKSM). Upon induction, mouse fibroblasts must undergo MET to successfully begin the initiation phase of reprogramming. Epithelial-associated genes such as E-cadherin/Cdh1, Cldns −3, −4, −7, −11, Occludin (Ocln), Epithelial cell adhesion molecule (Epcam), and Crumbs homolog 3 (Crb3), were all upregulated before Nanog, a key transcription factor in maintaining pluripotency, was turned on. Additionally, mesenchymal-associated genes such as Snail, Slug, Zeb −1, −2, and N-cadherin were downregulated within the first 5 days post-OKSM induction. Addition of exogenous TGF-β1, which blocks MET, decreased iPS reprogramming efficiency significantly. These findings are all consistent with previous observations that embryonic stem cells resemble epithelial cells and express E-cadherin. Recent studies have suggested that ectopic expression of Klf4 in iPS cell reprogramming may be specifically responsible for inducing E-cadherin expression by binding to promoter regions and the first intron of CDH1 (the gene encoding for E-cadherin).
The 7 kDa DNA-binding proteins are a family of DNA-binding proteins from Sulfolobales archaea. These proteins bind DNA in a mostly sequence-independent manner, with some preference for G/C rich regions and affinities that differ from each other. They serve a genome-packaing purpose analogous to histones. They are resistant to high temperatures as well as low and high pH.
hydroxide A diatomic anion consisting of a hydrogen atom covalently bonded to an oxygen atom, having an overall negative charge, with the chemical formula OH−; or any member of a class of organic and inorganic compounds containing a hydroxy group, e.g. sodium hydroxide (NaOH).
== References == Aagaard et al.: "An inflammatory role for the mammalian carboxypeptidase inhibitor latexin: relationship to cystatins and the tumor suppressor TIG1." Structure 13(2), 309–317, 2005. Cho et al.: "Hypermethylation of CpG island loci and hypomethylation of LINE-1 and Alu repeats in prostate adenocarcinoma and their relationship to clinicopathological features." J Pathology 211(3), 269–277, 2007. Gautron et al.: "Ovacalyxin-32, a novel chicken eggshell matrix protein." J Biol Chem 276(42), 39243–39252, 2001. Jing et al.: "Tazarotene-Induced Gene 1 (TIG1) expression in prostate carcinomas and its relationship to tumorigenicity" J Natl Cancer Institute 94(7), 482–490, 2002. Liang et al.: "The quantitative trait gene latexin influences the size of the hematopoietic stem cell population in mice." Nature Genetics 39(2), 178–188, 2007. So et al.: "Multiple tumor suppressor genes are increasingly methylated with age in non-neoplastic gastric epithelia." Cancer Sci 97(11), 1155–1158, 2006.
Sources: en.wikipedia.org
Enzymatic reporters (e.g., LacZ) encode enzymes that catalyze reactions yielding a visible product. For example, β-galactosidase (encoded by LacZ) cleaves X-gal to produce a blue color, allowing easy identification of successful gene disruption (white colonies) versus intact genes (blue colonies). Bioluminescent reporters (e.g., luciferase) produce light via chemical reactions, enabling live-cell imaging and promoter studies without external light sources. Colorimetric reporters (e.g., CAT) generate detectable color changes when enzymes react with substrates, measurable via spectrophotometry or TLC. Selectable markers (e.g., Neo) confer antibiotic resistance (e.g., to G418), ensuring only transformed cells survive in selective media. In the case of selectable-marker reporters such as CAT, the transfected population can be grown on a chloramphenicol-containing substrate. Only cells with the CAT gene survive, confirming successful transformation.
=== Lithium === Lithium extraction is more popular due to the high demand of lithium-ion batteries. TBP (Tri-butyl phosphate) and FeCl3 are mostly used to extract lithium from brine (with high Li/Mg ratio). Alternatively, Cyanex 272 was also used to extract lithium. The mechanism of lithium extraction was found differently from other metals, such as cobalt, due to the weak coordinating bonding between lithium ions and extractants.
Narrated by Tim Pigott-Smith, produced by Patrick Uden, directed by Sheila Hayman, made by Uden Associates 4 September The Tin Snail, about the Citroën 2CV; the 2CV was first introduced in October 1948; André Citroën saw himself as a French Henry Ford, and met American automotive industrialists in October 1931, including Henry Ford at the newly opened Ford Engineering Laboratory; the industrial historian Patrick Fridenson; Citroën lit up the Eiffel Tower in Citroën regalia, for publicity; but although André Citroën followed and admired Henry Ford, Citroën were innovative themselves, on 18 April 1934 the company launched the world's first mass-produced front-wheel drive car, the Citroën Traction Avant, when the company was narrowly avoiding bankruptcy; André Citroën died in 1935 and his company, being heavily in debt, was taken over by Édouard Michelin (brother of André Michelin); Fiat introduced its similar Fiat 500 in 1935, designed by Dante Giacosa; Ferdinand Porsche designed a new mass-produced car with rear air-cooled horizontally-opposed four-cylinder engine; France did not have such a car to Germany, so Citroën developed the Toute Petite Voiture (TPV), a proposal of Pierre Michelin - he brought in André Lefèbvre, who had designed the front-wheel-drive system of the Traction Avant and was a former aircraft engineer of Voisin, and led by Pierre-Jules Boulanger; Lefèbvre came from the aviation industry, and to save weight, made the car out of aluminium; the car had a torsion bar suspension, with eight torsion bars; Flaminio Bertoni, an Italian, was head of exterior design at Citroën, from 1932 to 1964; Carl Olsen, head of Citroën exterior design from 1982 to 1987; Alex Moulton, the Cambridge-educated mechanical engineer, who designed the suspension for the innovative Mini, in the late 1950s; Lucien Gerard, from Talbot, and Walter Becchia, who designed the two-cylinder water-cooled horizontally opposed engine. Narrated by Peter Jones, produced by Patrick Uden, directed by Jeremy Llewellyn-Jones, made by Uden Associates 11 September Deep Trouble, about the North Sea oil industry; the beginning of 1986 saw peak production of North Sea oil; finding new oil reserves would be from deeper oil fields, that cost more money to extract; at the same time the oil price plummeted, with over 15,000 job losses in the British oil industry by the end of 1986; Vickers Ltd entered the oil exploration industry; submersible craft were helping exploration of oil, with remotely operated craft becoming important. Narrated by Martin Jarvis, produced by Patrick Uden, directed by Paul Fabricius, made by Uden Associates 18 September What They Don't Tell You When They Sell You a Computer, about professionalism in the computer hardware industry; Eddy Shah from the Today newspaper, and their new unreliable computer system; Brian Wilson of First Computer believed that the computer hardware retailing industry were largely unprofessional unscrupulous cowboys; the National Computing Centre (NCC) was set up by the government in 1966, to provide advice; BP opened its own Microshop, to circumvent the cowboys, and assist with technical jargon, and connecting devices; due to warp-drive technical obsolescence in the 1980s, yesterday's computers rapidly lost all total value; Iain Callaghan, operations director of John Menzies newspaper distribution business, and how computer databases could process newsagents' daily orders much quicker and reliably; Geoff Dalby, head of data at Woolwich Equitable Building Society, which had called off a merger with the Nationwide Building Society, as their computer systems would not work together; greater computer automation of the personal finance industry could lead to much less day-to-day contact with individual customers; David Bailey of Phillips & Drew. Narrated by Miriam Margolyes, produced by Michael Blakstad, directed by Catherine Robins, made by Workhouse Productions 25 September Precisely in Profit, about manufacturing to exact margins. Produced by Glyn Jones, directed by Eben Wilson, made by Quanta 2 October Now Eat This, about snack foods. Produced by Edward Poulter, directed by Mike Tomlinson, made by London Scientific Films 9 October Growing up with Rockets, a personal, and underreported, view of early elementary rocketry from 1950, starting with captured German V-2 rockets; the former 1970 class of Cocoa Beach High School; failed launches would land in the Banana River; NASA was formed in July 1958, in a coherent response to the Russian launches in 1957; the President visits Cocoa Beach to celebrate the US getting a man to orbit the Earth in February 1962; the nearby Patrick Air Force Base; Syncom 3 was launched on 19 August 1964, the world's first geostationary communication satellite, on a Delta rocket; the minutes leading up to the first launch of STS-1 in April 1981. Directed and a first hand account of Nancy Yasecko, produced by Patrick Uden, made by Uden Associates 16 October Shock Trauma, about the Baltimore Shock Trauma Center (R Adams Cowley Shock Trauma Center). A Canadian production, produced by Patrick Uden, made by National Film Board of Canada and Uden Associates 23 October Drink Drive and Murder; it featured two court cases in the US, where a 33 year old killed a couple in their 20s, and a 17 year old who killed a couple of teenagers, and a Californian drink-drive reform centre; in some US states, if you kill when drunk, the charge is murder. A Canadian production, made by Uden Associates and the National Film Board of Canada 30 October The New Magicians, about film special effects; Gertie the Dinosaur in 1914 and The Sinking of the Lusitania in 1918; the King Kong (1933 film); the 1950s and 1960s saw modest increases in special effects, notably Forbidden Planet in 1956, until 2001: A Space Odyssey was important in 1968; another important film was Star Wars (film) in 1977, along with Close Encounters of the Third Kind, Tron in 1982 and The Last Starfighter in 1984. A Canadian production, produced by Ken McKay, made by TV Ontario 6 November Pioneers of the Future, about the development of microchips, such as Steve Dorsey, who invented the word processor. A Canadian production, produced by Ken McKay, made by Uden Associates and TV Ontario 13 November Skyscraper, about Old Madison Square Gardens and skyscrapers in Chicago and New York; Arthur Nusbaum; architect Stanley Tigerman; the tallest masonry-only building was 16 storeys high; the Great Chicago Fire in October 1871, which allowed different, and stronger, structures of building to be built instead; the 1902 Flatiron Building; architect Jack Hartray; mechanical engineer George Strakosch; the 1908 600-feet Singer Building; the 1912 800-feet Woolworth Building; the 1915 Equitable Building (Manhattan); the 1930 900-feet Chrysler Building; the 1931 1250-feet Empire State Building; mechanical engineer David Stillman; structural engineer Charles Thornton; architect Robert Sobel; structural engineer Leslie E. Robertson; civil engineer Alan Garnett Davenport of the University of Western Ontario; architect Bruce Graham; architect Harry Weese; architect Moshe Safdie. Narrated by William Woollard, produced by Nicola Glucksmann, directed by Karl Sabbagh, made by InCA
Certificate of Merit (1987) from the Indian Chemical Society for the best paper presentation, at the Convention of Chemists, 1987 2. Special Award and Citation (1988) of the Syndicate of Calicut University, Kerala, India for outstanding research contributions during 1985-1988 3. Swarnajayanti Research Grant (2001), Special research grant to outstanding young researchers by DST, Govt. India 4. Ramanna Fellow, DST (2007) 5. Adjunct Professor, Material Science Programme, IIT, Kanpur 6. Dean, Chemical Sciences, Academy of Scientific and Innovative Research (AcSIR) 7. A. V. Rama Rao Foundation Award Lecture of JNCASR, Bangalore (2012) 8. R. A. Mashelkar Endowment, NCL Pune (2012) 9. Chair on Nanoscience and Nanotechnology, Centre for Nanoscience and Nanotechnology, Mahatma Gandhi University, Kottayam, Kerala, 2013 10. Prof. K. K. M. Yusuff Endowment, Cochin University of Science and Technology, 2013 11. CHEMCON distinguished speaker award, 2016. 12. ISCB-2017 Award given by Indian Society of Chemists and Biologists. Academy Fellowships 1. Fellow, Indian Academy of Sciences, Bangalore (2006) 2. Fellow, National Academy of Sciences, Allahabad, India (2011) 3. Fellow, Indian National Science Academy, New Delhi (2012) 4. Honorary Fellow, Kerala Academy of Sciences (2013) 5. Fellow, Royal Society of Chemistry, London (2014) 6. Fellow, The World Academy of Science (2015) Research Fellowships
=== Kidneys === The renal parenchyma is divided into two major structures: the outer renal cortex and the inner renal medulla. Grossly, these structures take the shape of 7 to 18 cone-shaped renal lobes, each containing renal cortex surrounding a portion of medulla called a renal pyramid.
Sources: en.wikipedia.org
The first glaucoma drainage implant was developed in 1966. Since then, several types of implants have followed on from the original: the Baerveldt tube shunt, or the valved implants, such as the Ahmed glaucoma valve implant or the ExPress Mini Shunt and the later generation pressure ridge Molteno implants. These are indicated for glaucoma patients not responding to maximal medical therapy, with previous failed guarded filtering surgery (trabeculectomy). The flow tube is inserted into the anterior chamber of the eye, and the plate is implanted underneath the conjunctiva to allow a flow of aqueous fluid out of the eye into a chamber called a bleb.
== Structure == Pyruvic acid crystallizes as the keto acid, not the enol. The six non-hydrogen atoms are nearly coplanar. More relevant to biochemistry is the structure of the pyruvate anion. Several salts of pyruvate have been examined by X-ray crystallography. These tests confirm that pyruvate anion also exists in the keto form.
Flora (フローラ, Furōra): An android designed to resemble a teenage girl who an Alienizer named Metiussl originally named Meria (メリア) and created to serve as the brain of his robotic monster, Gigas. After meeting and befriending Sen-chan, however, she learned to develop a "heart" and be more than a machine. After being captured by Metiussl and rescued by Deka Master, Flora joins S.P.D., who accept her as a human. Flora is portrayed by Takaou Ayatsuki (彩月 貴央, Ayatsuki Takaō). Zoinaian Baytonin (ゾイナー星人ベートニン, Zoinā Seijin Bētonin): An alien from Planet Zoina who ages more slowly than humans, crashed-landed in Kyoto during Feudal Japan, and became a samurai under Ban's ancestor's tutelage. After ending up in the present, Agent Abrella manipulates the confused Baytonin into believing the Dekarangers are malicious invaders until Ban uses Kruger's D-Sword Vega to defeat Baytonin in battle. Upon realizing the truth, Baytonin leaves peacefully. Baytonin is voiced by Mantarō Iwao (岩尾 万太郎, Iwao Mantarō). Bannoshin Akaza (赤座 伴之進, Akaza Ban'noshin): Ban's ancestor from Feudal Japan who nursed the stranded Baytonin back to health and trained him in the ways of bushido and samurai conduct. Bannoshin Akaza is portrayed by Ryuji Sainei, who also portrays Ban Akaza. Barisien Attika Alpachi (バリス星人アッティカ・アルパチ, Barisu Seijin Attika Arupachi): An alien from Planet Barisie. An Alienizer named Goldom kidnaps his son and forces him to take a city block hostage, and threaten to destroy it with a bomb, so Goldom can rob a nearby bank in the confusion.
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Sources: en.wikipedia.org
Dihexa is a synthetic peptide derived from angiotensin IV and studied for effects on synaptic plasticity. It is often described as a hepatocyte growth factor mimetic. It is not an approved medication.
It is based on angiotensin IV, a naturally occurring peptide fragment, but dihexa itself is chemically modified and synthetic. The modifications aim to improve stability and activity compared with the parent fragment.
Laboratory studies have used cell-based assays and rodent models. These examine receptor signaling, dendritic spine changes, and behavioral tasks. Published human clinical trial data are lacking.
Liquid chromatography–mass spectrometry is commonly used. It provides molecular mass and purity information. Other methods may include HPLC with ultraviolet detection.