Everything below concerns Oxidation. We keep the language plain, cite what the science says, and separate well-supported claims from open questions.
Last reviewed on 2025-12-06. Where a claim depends on a specific study, the study is described rather than over-claimed.
Published research covers ischemic stroke, traumatic brain injury, cognitive impairment, optic nerve conditions and attention-related measures. Much of the human evidence comes from small trials conducted in one country, which limits how far the results generalize. Animal models supply the larger share of the data, and effects seen in rodents do not transfer automatically to people. Reviews have noted that methodological reporting is often incomplete, making it difficult to pool results or compare treatment schedules across studies.
Pharmacokinetic accounts emphasize rapid breakdown. After intravenous dosing the intact peptide disappears from blood within minutes, and nasal delivery produces low but measurable concentrations. Metabolites rather than the parent molecule may account for part of the observed activity, although the relative contribution is unresolved. Dosing in the literature varies widely and no optimal schedule has been agreed. These gaps are regularly cited as a reason the findings have not produced broad clinical adoption beyond the original research setting.
The compound is registered in Russia as a pharmaceutical product, most commonly formulated as a nasal solution, and has been used in that setting since the 1990s. Outside that jurisdiction it is generally handled as a research chemical rather than an approved medicine. Regulatory status therefore differs sharply between countries, and material sold internationally may not correspond to the Russian pharmaceutical formulation. Documentation with commercial samples is typically limited to a certificate of analysis covering purity and identity, not clinical status or local legal classification.
Semax is a synthetic heptapeptide with the sequence Met-Glu-His-Phe-Pro-Gly-Pro. It corresponds to the ACTH(4-7) fragment extended at the C-terminus by a Pro-Gly-Pro tripeptide, an addition intended to slow enzymatic breakdown. The molecular formula is C37H51N9O10S and the molecular mass is approximately 814 daltons. In the literature it is often described as an ACTH(4-10) analog, although that label reflects a naming convention as much as a precise structural relationship. The compound was developed in Russia and remains most closely associated with that research tradition.
| Property | Value | Notes |
|---|---|---|
| Primary research models | Rodent studies | Largest share of published data |
| Reported markers | BDNF and NGF expression | Measured mainly in animal tissue |
| Common administration | Intranasal | Matches the registered formulation |
| Blood residence time | Minutes | Rapid enzymatic degradation |
| Evidence quality | Small trials, limited replication | Noted repeatedly in reviews |
Material sold for laboratory use varies widely in stated purity and documentation. A certificate of analysis should list the analytical method, the column and detector used, and the observed purity value. Independent verification by an outside laboratory is the practical way to confirm identity when documentation is absent or internally inconsistent. Regulatory status differs by country, and a product legal in one jurisdiction may be unapproved or controlled in another.
Identity and purity of semax are established with reversed-phase high-performance liquid chromatography coupled to ultraviolet detection, usually at 214 nanometres. Mass spectrometry, most often electrospray ionisation in positive mode, confirms the molecular mass and reveals truncated sequences. Amino acid analysis and peptide mapping after enzymatic digestion provide additional structural confirmation. Laboratories typically report purity as the percentage area of the main peak, a figure that does not capture isomeric or oxidised variants unless the method resolves them.
Scientific literature on semax is unevenly distributed. A substantial share of published work originates from a small number of laboratories in Russia, while independent replication elsewhere is limited. Human data consist mostly of small trials with short follow-up, and several reported outcomes rely on subjective rating scales. Questions about how much intact peptide reaches the central nervous system after nasal administration, and how long it persists there, are still unresolved. The compound is best described as an active research subject rather than a settled pharmacological agent.
Semax is a synthetic heptapeptide with the sequence Met-Glu-His-Phe-Pro-Gly-Pro. It was derived from the ACTH(4-10) fragment, a short segment of adrenocorticotropic hormone that lacks the hormonal activity associated with the full-length peptide. Researchers at the Institute of Molecular Genetics in Moscow developed the compound during the 1980s. It has been registered as a pharmaceutical product in Russia and several neighbouring countries, where it is supplied as a nasal solution, and it is also sold internationally as a research chemical.
The proposed mechanism centres on neurotrophic signalling rather than direct receptor activation. Semax is reported to increase expression of brain-derived neurotrophic factor and nerve growth factor in several brain regions, and to shift the balance between excitatory and inhibitory neurotransmitter systems. Interaction with melanocortin receptors has been suggested because of the parent ACTH fragment. Many of these findings come from rodent studies, and the extent to which they translate to human physiology remains an open question.
常规纯度与身份确认依赖反相高效液相色谱，并辅以质谱测定分子量。氨基酸组成分析可用于验证序列构成，肽图分析则能进一步定位修饰或降解产物。杂质谱通常关注缺失序列肽、截短片段和氧化产物。不同方法的检出限并不相同，因此各实验室报告的纯度数值不宜直接横向比较。
多数实验室与市售的 Semax 以冻干粉形式提供。冻干粉通常建议保存在 -20 °C 或更低温度下，同时避免光照与反复升温。短期运输有时采用冷藏条件，但长期保存仍以冷冻为主。分包操作应尽量减少开盖次数，以降低吸湿和微生物污染的风险。开封后若未一次用完，建议在干燥环境中密封并尽快放回低温储存。
溶液状态的稳定性明显低于冻干粉。肽类在水溶液中可能经历水解、氧化与聚集，其中甲硫氨酸和天冬酰胺等残基常是敏感位点。Semax 含有甲硫氨酸，因此氧化风险相对突出。工作液一般主张现配现用，或冷藏并在数日内用尽。缓冲液种类、pH 和离子强度都会影响降解速率，而关于最佳条件的公开数据并不统一。
The first performance in Los Angeles in 1954 was introduced with a tribute to Thomas from Aldous Huxley. Thomas spent the last nine or ten days of his third tour in New York mostly in the company of Reitell, with whom he had an affair. During this time, Thomas fractured his arm falling down a flight of stairs when drunk. Reitell's doctor, Milton Feltenstein, put his arm in plaster and treated him for gout and gastritis. After returning home, Thomas worked on Under Milk Wood in Laugharne. Aeronwy, his daughter, noticed that his health had "visibly deteriorated...I could hear his racking cough. Every morning he had a prolonged coughing attack...The coughing was nothing new but it seemed worse than before." She also noted that the blackouts that Thomas was experiencing were "a constant source of comment" amongst his Laugharne friends. Thomas sent the original manuscript to Douglas Cleverdon on 15 October 1953. It was copied and returned to Thomas, who lost it in a pub in London and required a duplicate to take to America. Thomas flew to the States on 19 October 1953 for what would be his final tour. He died in New York before the BBC could record Under Milk Wood. Richard Burton starred in the first broadcast in 1954, and was joined by Elizabeth Taylor in a subsequent film. In 1954, the play won the Prix Italia for literary or dramatic programmes.
Use of higher doses of radioiodine reduces the number of cases of treatment failure, with a penalty for higher response to treatment consisting mostly of higher rates of eventual hypothyroidism, which requires hormone treatment for life. There is increased sensitivity to radioiodine therapy in thyroids appearing on ultrasound scans as more uniform (hypoechogenic), due to densely packed large cells, with 81% later becoming hypothyroid, compared to just 37% in those with more normal scan appearances (normoechogenic).
The Council of Common Interests (CCI) (Urdu: مشترکہ مفادات ہیئتِ, romanized: Muśtarkāh Mufādāt He'at) is an eight-member federal constitutional body in the government of Pakistan. It is appointed by the president on the prime minister's advice, and resolves the disputes of power sharing between the federation and its provinces (with chief ministers representing their respective provinces). The Council works under the Ministry of Inter Provincial Coordination and is responsible to both houses of the Parliament, the Senate and the National Assembly.
== Overdose == There are few reports of ACE inhibitor overdose, toxicity is more likely with the addition of other hypertensive drugs or higher than recommended doses. The most likely manifestations are hypotension, which may be severe, hyperkalemia, hyponatremia and renal impairment with metabolic acidosis. Related symptoms of hypotension are treated with naloxone. Treatment should be mainly symptomatic and supportive, with volume expansion using normal saline to correct hypotension and improve renal function, and gastric lavage followed by activated charcoal and a cathartic to prevent further absorption of the drug. Captopril, enalapril, lisinopril and perindopril are known to be removable by hemodialysis.
== Drug interactions == Smoking is known to increase levels of liver enzymes that break down drugs and toxins. That means that drugs cleared by these enzymes are cleared more quickly in smokers, which may result in the drugs not working. Specifically, levels of CYP1A2 and CYP2A6 are induced: substrates for 1A2 include caffeine and tricyclic antidepressants such as amitriptyline; substrates for 2A6 include the anticonvulsant valproic acid.
Sources: en.wikipedia.org
Complex DNA and RNA organic compounds of life, including uracil, cytosine, and thymine, have also been formed in the laboratory under conditions mimicking those found in outer space, using starting chemicals, such as pyrimidine, found in meteorites. Pyrimidine, like polycyclic aromatic hydrocarbons (PAHs), the most carbon-rich chemical found in the universe, may have been formed in red giants or in interstellar cosmic dust and gas clouds. Ancient DNA has been recovered from ancient organisms at a timescale where genome evolution can be directly observed, including from extinct organisms up to millions of years old, such as the woolly mammoth.
==== Philippines ==== The Chinese are being blamed after a cybersecurity company, F-Secure Labs, found a malware, NanHaiShu, which targeted the Philippines Department of Justice. It sent information in an infected machine to a server with a Chinese IP address. The malware which is considered particularly sophisticated in nature was introduced by phishing emails that were designed to look like they were coming from an authentic sources. The information sent is believed to be relating to the South China Sea legal case.
Bacterial plasmids are circular sections of DNA that naturally replicate in bacteria. Plasmids are capable of holding inserts up to approximately 20 kbp in length. These types of constructs typically contain a gene offering antibiotic-resistance, an origin of replication, regulatory elements such as Lac inhibitors, a polylinker, and a protein tag which facilitates protein purification. Bacteriophage Vectors are viruses that can infect bacteria and replicate their own DNA. Artificial chromosomes are commonly used in genome project studies due to their ability to hold inserts up to 350 kbp. These vectors are derived from the F plasmid, taking advantage of the high stability and conjugational ability introduced by the F factor. Fosmids are a hybrid between bacterial F plasmids and λ phage cloning techniques. Inserts are pre-packaged into phage particles, then inserted into the host cell with the ability to hold ~45 kbp. They are typically used to generate a DNA library due to their increased stability.
Vox's Nicole Narea highlighted inflation outpacing wages in certain industries, rising unemployment, and rising consumer debt and falling savings as key economic indicators that Democrats "may have missed". In another Vox article, Andrew Prokop argued Harris suffered from a worldwide backlash to incumbents over inflation, as well as her struggles unifying the party over Gaza, failing to be a change candidate, and her difficulty in defending or abandoning positions she took during her 2020 presidential run.
The Neoplatonic philosopher Avicebron (Solomon ibn Gabirol) proposed a Neoplatonic version of this Aristotelian concept, according to which all things, including soul and intellect, are composed of matter and form.
Sources: en.wikipedia.org
If Hydra are alarmed or attacked, the tentacles can be retracted to small buds, and the body column itself can be retracted to a small gelatinous sphere. Hydra generally react in the same way regardless of the direction of the stimulus, and this may be due to the simplicity of the nerve nets. Hydra are generally sedentary or sessile, but do occasionally move quite readily, especially when hunting. They have two distinct methods for moving: looping and somersaulting. They do this by bending over and attaching themselves to the substrate with the mouth and tentacles and then relocate the foot, which provides the usual attachment; this process is called looping. In somersaulting, the body then bends over and makes a new place of attachment with the foot. By this process of looping or somersaulting, a Hydra can move several inches (c. 100 mm) in a day. Hydra may also move by amoeboid motion of their bases or by detaching from the substrate and floating away in the current. A dark-habituated Hydra that is exposed to light will respond by elongating its body towards it, bending its hypostome-tentacle junction, and eventually somersaulting towards the light source.
== Further reading == Yokozeki H, Fujimoto T, Abe Y, Igarashi M, Ishikoh A, Omi T, et al. (March 2021). "A phase 3, multicenter, randomized, double-blind, vehicle-controlled, parallel-group study of 5% sofpironium bromide (BBI-4000) gel in Japanese patients with primary axillary hyperhidrosis". The Journal of Dermatology. 48 (3): 279–288. doi:10.1111/1346-8138.15668. PMC 7986147. PMID 33410265.
Nando's opened its first restaurants within the United Kingdom, in 1992, in the west London suburbs of Ealing and Earls Court, initially focusing on takeaway food. The UK arm, owned by the Enthoven family via a private equity company, struggled until chairman Dick Enthoven put his son Robert in control. The focus then moved from takeaways to a mixed-service (counter ordering and table service) model. This decision was taken after Nando's partnered with Harrison, a branding and design agency. They also advised Nando's to design each restaurant individually so no two restaurants were the same, a brand characteristic of the chain. In 2013, the company employed around 8,000 staff in the UK and had over 280 branches, with about 60 serving food conforming with Islamic dietary laws. In 2010, Nando's UK won the Sunday Times's 'best place to work' award in the big company category. Its sauces and marinades were also retailed in UK supermarkets. Nando's claims to have the largest collection of South African art in the UK, with over 5,000 works displayed in restaurants; original artworks are commissioned by the company. In March 2020, all of Nando's UK restaurants closed temporarily due to nationwide lockdown rules introduced by the government to limit the spread of COVID-19. In late April 2020, Nando's reopened select locations for delivery and collection services, with many more locations opening throughout May. In early July 2020, the restaurant chain started reopening a few of its outlets for eat-in service.
== Books == Interstellar Grains (Chapman & Hall, London, 1967) Light Scattering Functions for Small Particles with Applications in Astronomy (Wiley, New York, 1973) Solid-State Astrophysics (ed. with D.J. Morgan) (D. Reidel, Boston, 1975) Interstellar Matter (with F.D. Khan & P.G. Mezger) (Swiss Society of Astronomy and Astrophysics, 1974) The Cosmic Laboratory (University College of Cardiff, 1975) Lifecloud: The Origin of Life in the Universe (with Fred Hoyle) (J.M. Dent, London, 1978) Diseases from Space (with Fred Hoyle) (J.M. Dent, London, 1979) Origin of Life (with Fred Hoyle) (University College Cardiff Press, 1979) Space Travellers: The Bringers of Life (with Fred Hoyle) (University College Cardiff Press, 1981) Evolution from Space (with Fred Hoyle) (J.M.
=== Expert panel investigation === During Letby's 2022–2023 trial, the prosecution's expert witness, Dewi Evans, relied on a 1989 article by Canadian neonatologist Shoo Lee to support a diagnosis of air embolism as the mechanism of death in several cases. Lee did not learn that his research had been cited in the trial until after the verdict. He expressed concern that his work had been misapplied. Following Letby's unsuccessful application for leave to appeal in 2024, at the instruction of Letby's defence, Lee convened a panel of 14 medical experts to "review all of the cases from the trials." Letby's defence team provided the panel with medical records and other evidence. On 3 February 2025, Lee presented the findings of his panel at a press conference. Lee stated that the panel "did not find any murders" and concluded that "in all cases, death or injury were due to natural causes or just bad medical care".
Sources: en.wikipedia.org
The main proposal is modulation of neurotrophic factors such as brain-derived neurotrophic factor, supported largely by animal experiments. Receptor-level targets have not been firmly established. Most reviews describe the mechanism as only partially characterized.
The compound is registered as a medicine in Russia, so clinical work has concentrated there. Trials elsewhere are few and generally small. This geographic concentration is a recognized limitation in evidence reviews.
Some fraction may reach the central nervous system through olfactory pathways, and this is often cited as the rationale for the nasal route. The size of that fraction in humans is not well quantified. Blood concentrations after nasal dosing are low, which complicates measurement.
It is registered as a pharmaceutical product in Russia, where it is typically supplied as a nasal solution. In most other countries it is not an approved drug and is traded as a research chemical instead. Approval status depends entirely on the jurisdiction involved.