CAS Registry Number is one of those subjects where the details matter more than the headlines. This page pulls together the background, the mechanisms, and the practical points readers ask about most.
Updated 2026-07-30. Numbers and descriptions here follow the published literature rather than marketing material.
The angiotensin IV connection places dihexa in a family of short peptides studied for effects on central nervous system signaling. Angiotensin IV itself is a metabolite of angiotensin II, and analogs have been explored in cardiovascular and neurological research. Dihexa differs from the natural peptide through structural modifications intended to alter stability and receptor interactions. Published descriptions sometimes call it a hepatocyte growth factor mimetic, although that label reflects proposed activity rather than a confirmed clinical mechanism.
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.
Discussion of dihexa in online communities sometimes outpaces the scientific record. Anecdotal reports are difficult to verify and may not distinguish effects from placebo or expectation. The absence of approved human data means long-term risks remain unknown. Researchers continue to investigate related compounds and pathways. Open questions include whether animal findings translate to humans and which biological targets matter most. No consensus exists on these points. Current reviews emphasize the need for rigorous clinical research.
Most published work on dihexa consists of preclinical studies using cell cultures or rodents. Reports have described effects on synaptic connectivity and performance on cognitive tasks in some animal models. These findings are generally presented as preliminary and require independent replication. Study designs, doses, and outcome measures vary across experiments, which complicates direct comparison. No large controlled human trials have established efficacy or safety for any medical use. At present, the evidence base is limited.
| Property | Value | Notes |
|---|---|---|
| Chemical class | Synthetic peptide analog | Modeled on angiotensin IV; not a natural hormone. |
| Common synonyms | Dihexa; N-hexanoic-Tyr-Ile-(6)-aminohexanoic amide | Naming conventions differ across vendors and papers. |
| CAS Registry Number | 1401708-83-6 | Listed in some chemical databases; verify against primary sources. |
| Appearance | White to off-white powder | Typical form for lyophilized research peptides. |
| Solubility | Soluble in DMSO; limited in water | Organic stock solutions are common in laboratory settings. |
Animal studies have examined dihexa in models of cognitive impairment, synaptic plasticity, and memory. Some reports describe improved performance on maze or avoidance tasks after administration. These findings are preclinical and often involve small samples, varied routes, and differing formulations. Results in rodents do not establish effects in humans. The absence of published randomized controlled trials in people is a major gap in the evidence base. Observational reports and user accounts do not substitute for controlled clinical data.
Discussion in the literature often separates direct receptor activation from downstream growth-factor modulation. Dihexa is not simply an angiotensin receptor blocker or a classic nootropic drug. Its proposed action may depend on endogenous HGF levels, which vary by tissue and physiological state. Questions remain about brain penetration, metabolic stability, and active metabolites. Reviews note that mechanistic claims should be treated as hypotheses until supported by independent studies. That distinction is important when interpreting promotional claims or early laboratory findings.
Reported effects of dihexa are often described in terms of synaptogenesis, a process by which neurons form new synaptic connections. This concept is biologically plausible but difficult to measure directly in living humans. Animal behavioral tests can suggest memory or learning changes, yet such tests have limitations and may not translate to people. The literature includes conflicting or incomplete findings, and some studies are small. As a result, the mechanism remains a subject of investigation rather than a settled explanation.
The proposed mechanism of dihexa involves activation of hepatocyte growth factor and its receptor, c-Met. In cell models, this signaling pathway is associated with dendritic spine formation and synaptic reorganization. Dihexa is described as a stabilized analog of angiotensin IV, which also interacts with related systems. However, the precise binding profile and downstream effects remain incompletely characterized. Most mechanistic evidence comes from in vitro assays and rodent studies rather than human trials.
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.
Data from high-throughput chromosome conformation capture experiments, such as Hi-C (experiment) and ChIA-PET, can provide information on the three-dimensional structure and nuclear organization of chromatin. Bioinformatic challenges in this field include partitioning the genome into domains, such as Topologically Associating Domains (TADs), that are organised together in three-dimensional space.
=== Bingham plastic === Fluids that have a linear shear stress/shear strain relationship but require a finite yield stress before they begin to flow (the plot of shear stress against shear strain does not pass through the origin) are called Bingham plastics. Several examples are clay suspensions, drilling mud, toothpaste, mayonnaise, chocolate, and mustard. The surface of a Bingham plastic can hold peaks when it is still. By contrast Newtonian fluids have flat featureless surfaces when still.
Essendon's first recorded jumpers were navy blue (The Footballers, edited by Thomas Power, 1875) although the club wore 'red and black caps and hose'. In 1877, The Footballers records the addition of 'a red sash over left shoulder'. This is the first time a red sash as part of the club jumper, and by 1878 there are newspaper reports referring to Essendon players as 'the men in the sash'. Given that blue and navy blue were the most popular colours at the time, it is thought that Essendon adopted a red sash in 1877 to distinguish its players from others in similar-coloured jumpers.
== Awards == Broadbent was elected as a Fellow of the Royal Society Te Apārangi in 2021. The Society said "One of her most notable contributions is the development and testing of healthcare robots, especially for improving outcomes in rest-home and dementia care and chronic illness...this is innovative interdisciplinary work of exceptional quality".
The United States Department of Energy, National Science Foundation, NASA, industry, and nine universities pooled resources to access supercomputers from IBM, combined with cloud computing resources from Hewlett Packard Enterprise, Amazon, Microsoft, and Google, for drug discovery. The COVID-19 High Performance Computing Consortium attempted to forecast disease spread, model vaccines, and screen thousands of chemical compounds. The Consortium had used 437 petaFLOPS of computing power by May 2020. The C3.ai Digital Transformation Institute, an additional consortium of Microsoft, six universities (including MIT), and the National Center for Supercomputer Applications in Illinois, working under the auspices of artificial intelligence software company C3.ai pooled supercomputer resources toward drug discovery, medical protocol development and public health strategy improvement, as well as awarding grants for similar purposes.
Sources: en.wikipedia.org
The existence of graphene was first theorized in 1947 by Philip R. Wallace during his research on graphite's electronic properties, while the term graphene was first defined by Hanns-Peter Boehm in 1987, when he and coworkers isolated single sheets from graphite. In 2004, the material was isolated and characterized by Andre Geim and Konstantin Novoselov at the University of Manchester using a piece of graphite and adhesive tape. In 2010, Geim and Novoselov were awarded the Nobel Prize in Physics for their "groundbreaking experiments regarding the two-dimensional material graphene". While small amounts of graphene are easy to produce using the method by which it was originally isolated, attempts to scale and automate the manufacturing process for mass production have had limited success out of concern for cost-effectiveness and quality control. The global graphene market was $9 million in 2012, with most of the demand from research and development in semiconductors, electronics, electric batteries, and composites. In 2022, the graphene market reached an estimated global annual revenue of $380 million. The IUPAC (International Union of Pure and Applied Chemistry) advises using the term "graphite" for the three-dimensional material and reserving "graphene" for discussions about the properties or reactions of single-atom layers. A narrower definition, of "isolated or free-standing graphene", requires that the layer be sufficiently isolated from its environment, but would include layers suspended or transferred to silicon dioxide or silicon carbide.
=== Orb web construction === Most orb weavers construct webs in a vertical plane, although there are exceptions, such as Uloborus diversus, which builds a horizontal web. During the process of making an orb web, the spider will use its own body for measurements. There is variation in web construction among orb-weaving spiders, in particular, the species Zygiella x-notata is known for its characteristic missing sector web crossed by a single signal thread. Many webs span gaps between objects which the spider could not cross by crawling. This is done by first producing a fine adhesive thread to drift on a faint breeze across a gap. When it sticks to a surface at the far end, the spider feels the change in the vibration. The spider reels in and tightens the first strand, then carefully walks along it and strengthens it with a second thread. This process is repeated until the thread is strong enough to support the rest of the web. After strengthening the first thread, the spider continues to make a Y-shaped netting. The first three radials of the web are now constructed. More radials are added, making sure that the distance between each radial and the next is small enough to cross. This means that the number of radials in a web directly depends on the size of the spider plus the size of the web. It is common for a web to be about 20 times the size of the spider building it. After the radials are complete, the spider fortifies the center of the web with about five circular threads.
== Development == Developed as a next generation aptamer technology, Optimer ligands were produced to improve the performance, manufacturability, and commercialisation of aptamers. Optimer ligands are selected via an automated, high throughput in vitro screening process. 3 distinct discovery platforms are integrated into the Optimer platform for optimized discovery according to target type. Starting from a diverse library of potential nucleic acid binders, the Optimer library is refined and enriched for sequences that have the required binding characteristics including affinity, specificity, cross reactivity, and buffer compatibility. The enriched Optimer population is subsequently screened to identify the best performing Optimer ligand sequence. Following selection of the appropriate sequence the identified Optimer undergoes a process to determine the minimum oligonucleotide fragment within this sequence that possesses the correct target-binding characteristics. The Optimer is trimmed to contain only this sequence, removing additional free non-target binding nucleotide bases. This reduces the molecular weight of the Optimer from 29 kDa to 5 kDa and increases the stability of the molecule through a reduction in entropy, as additional motion of the free nucleotides is removed.
In addition to the mixture before drying, if necessary, other additives (e.g. extract, sweetener, spices, coloring matter, etc.) may be added. As a result, alcohol powder can be said to be an alcoholic beverage that is "dry". For example, a "dry martini" made from alcohol powder may be referred to as a "dry dry martini" or "dried dry martini". There are other methods for drying foods, but none are used for making alcohol powder. Typically, when considering the quality of a powdered product such as coffee, freeze drying seems to be better than spray drying, but this does not apply to alcohol powder production. In fact, "freeze-dried beer spice" was made by university students for their research. Carbon dioxide, water and alcohol have all been lost. However, due to the higher volatility of alcohol compared to water, time-consuming methods such as freeze drying should not be used. By selective diffusion, loss of alcohol is relatively small.
Sources: en.wikipedia.org
==== School education ==== Positive psychology is beneficial to schools and students because it encourages individuals to strive to do their best, whereas scolding has the opposite effect. Clifton and Rath discussed research conducted by Dr. Elizabeth Hurlock in 1925, where fourth, fifth and sixth graders were either praised, criticized or ignored, based on their work on math problems. Praised students improved by 71%, those criticized improved by 19%, and students provided with no feedback improved a mere 5%. Praise seems an effective method of fostering improvement. According to Clifton and Rath ninety nine out of one hundred people prefer the influence of positive people. The benefits include: increased productivity, and contagious positive emotions, which assists one in working to the best of their abilities. Even a single negative person can ruin the entire positive vibe in an environment. Clifton and Rath cited 'positive emotions as an essential daily requirement for survival'. In 2008, in conjunction with the Positive Psychology Center at the University of Pennsylvania, a whole-of-school implementation of Positive Psychology was undertaken by Geelong Grammar School (Victoria, Australia). This involved training of teaching staff in the principles and skills of positive psychology. Ongoing support was provided by The Positive Psychology Center staff, who remained in-residence for the entire year. Staats, Hupp and Hagley (2008) used positive psychology to explore academic honesty.
== Education == After graduating from National Taiwan University, Chen completed doctoral studies in the United States and earned his Ph.D. in physical chemistry from Iowa State University in 1997 under professor Cheuk-yiu Ng. She then completed post-doctoral research at Ames Laboratory in 1997, and then at Yuan-Pern Lee's group at National Tsing Hua University in 1999.
Because genome-wide data still separate the lineages, they remain distinct species even though their history cannot be depicted by a simple bifurcating tree. Keuler and colleagues recommend routine hybridisation tests (e.g., gene-tree comparison, HybridDetective) in intensive delimitation projects. Overall, such studies highlight how cryptic and dynamic lichen species can be, and they continue to drive up recognized species numbers.
A common SNP in the BDNF gene is rs6265. This point mutation in the coding sequence, a guanine to adenine switch at position 196, results in an amino acid switch: valine to methionine exchange at codon 66, Val66Met, which is in the prodomain of BDNF. Val66Met is unique to humans. The mutation interferes with normal translation and intracellular trafficking of BDNF mRNA, as it destabilizes the mRNA and renders it prone to degradation. The proteins resulting from mRNA that does get translated, are not trafficked and secreted normally, as the amino acid change occurs on the portion of the prodomain where sortilin binds; and sortilin is essential for normal trafficking. The Val66Met mutation results in a reduction of hippocampal tissue and has since been reported in a high number of individuals with learning and memory disorders, anxiety disorders, major depression, and neurodegenerative diseases such as Alzheimer's and Parkinson's. A meta-analysis indicates that the BDNF Val66Met variant is not associated with serum BDNF.
"Tetraloop receptor motifs" are long-range tertiary interactions consisting of hydrogen bonding between the bases in the tetraloop to stemloop sequences in distal sections of the secondary RNA structure. In addition to hydrogen bonding, stacking interactions are an important component of these tertiary interactions. For example, in GNRA-tetraloop interactions, the second nucleotide of the tetraloop stacks directly on an A-platform motif (see above) within the receptor. The sequence of the tetraloop and its receptor often covary so that the same type of tertiary contact can be made with different isoforms of the tetraloop and its cognate receptor. For example, the self-splicing group I intron relies on tetraloop receptor motifs for its structure and function. Specifically, the three adenine residues of the canonical GAAA motif stack on top of the receptor helix and form multiple stabilizing hydrogen bonds with the receptor. The first adenine of the GAAA sequence forms a triple base-pair with the receptor AU bases. The second adenine is stabilized by hydrogen bonds with the same uridine, as well as via its 2'-OH with the receptor and via interactions with the guanine of the GAAA tetraloop. The third adenine forms a triple base pair.
Sources: en.wikipedia.org
Dihexa is a synthetic peptide analog related to angiotensin IV. It is studied in preclinical research for effects on neural signaling and synapse formation. It is not an approved medicine.
No. Dihexa shares a conceptual link to angiotensin IV but has different structural features. Those changes are intended to modify its behavior in biological systems.
It often appears as N-hexanoic-Tyr-Ile-(6)-aminohexanoic amide. Synonyms and CAS listings vary, so cross-checking identifiers is necessary.
Published human trials are lacking. Most evidence comes from laboratory and animal studies. Therefore, human benefits and risks are not established.