A practical reference on intranasal delivery: what it is, how it behaves, what the literature reports, and where the honest uncertainties sit.
This page was last updated on 2026-02-20 and is reviewed periodically as new material appears.
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.
Proposed mechanisms center on neurotrophic signaling rather than on classical melanocortin receptor activation. Rodent experiments have reported shifts in the expression of brain-derived neurotrophic factor and nerve growth factor after administration, together with changes in the associated receptor systems. Several authors argue that the peptide acts largely through its degradation products and their interaction with peptidergic pathways, but this remains a hypothesis rather than a settled finding. No single molecular target has been identified in a way that the field broadly accepts.
Claims about enhanced focus, memory, or mood in healthy people rest mostly on anecdotal reports and community discussion rather than on controlled data. It remains unclear whether any cognitive benefit observed in patients recovering from brain injury would extend to uninjured users. Dose-response relationships, long-term safety, and interactions with other drugs are not well characterized in the peer-reviewed literature. Questions about optimal route of administration and treatment duration likewise remain open.
Semax binds to melanocortin receptors and is thought to influence neuronal survival and plasticity rather than to act through the adrenal axis. Laboratory work has shown increased expression of brain-derived neurotrophic factor and nerve growth factor in treated tissue. Changes in c-Fos, a marker of neuronal activation, have also been reported. Because the peptide is rapidly degraded by peptidases, its effects are generally attributed to downstream signaling cascades rather than to sustained receptor occupancy.
Published studies are dominated by animal models of stroke, ischemia, and cognitive impairment, with a smaller number of human trials conducted in Russia. Many of the human reports are small, single-center, and published in Russian-language journals, which limits independent scrutiny. Outcome measures vary between studies and often rely on clinician-rated scales rather than objective biomarkers. Systematic reviews have noted the methodological weaknesses and called for larger, preregistered trials before firm conclusions can be drawn.
| 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 |
Circulation time for the peptide is short because peptidases cleave it readily. The Pro-Gly-Pro tail is thought to slow breakdown compared with the bare ACTH fragment, but the gain appears modest. Absorption after intranasal dosing is limited, and only a fraction of a dose is expected to reach the central nervous system. Laboratory concentrations therefore sit well above levels achieved systemically, a gap that complicates translation from bench findings to clinical claims.
The mechanisms attributed to semax are inferred from animal and cell studies rather than traced to one confirmed target. The most frequently cited pathway involves increased expression of brain-derived neurotrophic factor and nerve growth factor in hippocampal and cortical tissue. Some work points to engagement of melanocortin receptors, particularly MC4, which the parent ACTH fragment can activate. Effects on dopaminergic and serotonergic signalling have also been reported. No single account explains all observed results, and the relative weight of each pathway remains unsettled.
The first use of microwaves to pop corn kernels was when Raytheon engineer Percy Spencer further tested his observation of a nut candy bar melting in his pocket while working with radar tubes during WWII.
=== Rise of the independence movement === Most of the members of the former GOCA who had not died during the Ten Year's War or the Little War went into exile abroad. Instead of maintaining close connections to the new United Grand Lodge, they regularized their degrees and joined into Lodges in Mexico, Honduras, Costa Rica, the Dominican Republic, Colombia, Jamaica, Haiti, and the United States. As a diaspora, they coordinated in the creation of the Cuban Revolutionary Party and the Cuban Junta. These diaspora Masons also created new Lodges, like the Francisco Vicente Aguilera Lodge and the Ignacio Agramonte Lodge in Florida. Most of the leaders of the Cuban War of Independence were Freemasons, including José Martí, Antonio Maceo, and Máximo Gómez, but unlike during the Ten Years' War which had been directly instigated by GOCA Lodges and their leaders, a singular Freemasonic body was not directly responsible for the new Cuban Revolution. Instead, these Freemasons commingled with non-Masons and other average citizens to raise the funds, support, and armaments to fight against Spain. Because political parties had been legalized in Cuba, revolutionaries no longer needed any place to meet entirely in secret to discuss the concept of independence. The conversation was happening in the open, and throughout all of Cuba and the Caribbean. Since they were allowed to gather at the Party headquarters, political parties took the place within the ideological niche that GOCA once held.
=== Etymology === The Komodo dragon is also sometimes known as the Komodo monitor or the Komodo Island monitor in scientific literature, although these names are uncommon. To the natives of Komodo Island, it is referred to as ora, buaya darat ('land crocodile'), or biawak raksasa ('giant monitor').
One of the largest traditional markets in Taiwan, the Jianguo Market in Taichung, was torn down and replaced by a new facility in 2016. The new facilities provided better hygiene, disability accessibility, and refrigeration, but the relocation was initially met with hesitation from the local vendors before a grassroots outreach campaign led to greater acceptance.
Most reptiles are insectivorous or carnivorous and have simple and comparatively short digestive tracts due to meat being fairly simple to break down and digest. Digestion is slower than in mammals, reflecting their lower resting metabolism and their inability to divide and masticate their food. Their poikilotherm metabolism has very low energy requirements, allowing large reptiles like crocodiles and large constrictors to live from a single large meal for months, digesting it slowly. While modern reptiles are predominantly carnivorous, during the early history of reptiles several groups produced some herbivorous megafauna: in the Paleozoic, the pareiasaurs; and in the Mesozoic several lines of dinosaurs. Today, turtles are the only predominantly herbivorous reptile group, but several lines of agamas and iguanas have evolved to live wholly or partly on plants. Herbivorous reptiles face the same problems of mastication as herbivorous mammals but, lacking the complex teeth of mammals, many species swallow rocks and pebbles (so called gastroliths) to aid in digestion: The rocks are washed around in the stomach, helping to grind up plant matter. Fossil gastroliths have been found associated with both ornithopods and sauropods, though whether they actually functioned as a gastric mill in the latter is disputed. Salt water crocodiles also use gastroliths as ballast, stabilizing them in the water or helping them to dive. A dual function as both stabilizing ballast and digestion aid has been suggested for gastroliths found in plesiosaurs.
Sources: en.wikipedia.org
== Target == GsMTx-4 mainly targets mechanosensitive channels from the Piezo and TRP families, such as Piezo1 and TRPC6 which are generally bilayer tension-sensitive. This corresponds to the strong bilayer partitioning energy of GsMTx-4. It also targets a spectrum of voltage-dependent sodium channels (human Nav1.1- Nav1.7), human ERG channels (Kv11.1 and Kv11.2), and acetylcholine receptors.
=== Diagnosis and treatment === In current practice for dogs, B. canis is diagnosed using PCR, cultures, and serologic testing. The most standard test for B. canis is culture. These cultures are typically conducted on the host's blood, vaginal discharge, or semen. However, this method is not effective if the dog has been treated with antimicrobial drugs, as this will clear B. canis bacteria even if the disease has not resolved. Serology is used to evaluate the antibody response against Brucella spp. cell wall antigens, the downfall of this method is its lack of specificity. PCR testing has shown potential as a rapid test, however it is not readily available and is currently considered an experimental test. Currently, there are not commercially available vaccines for B. canis. Antimicrobial treatment and sterilization of the infected animals is considered an alternative to removing the animal. There have been reports of anti-Brucella vaccines (used for cattle and small ruminants), used along with previously mentioned methods but is not considered practical due to its risk of vaccine strain shedding in a domestic environment with current vaccines maintaining an amount of virulence for humans. Treatment for B. canis is very difficult to find and often very expensive. This is due to B. canis being a intracellular bacteria, meaning it replicates inside of host cells rather than outside of them. This makes it difficult for antibiotics to reach the bacteria.
==== Knight Grand Cross of the Order of the Bath (GCB) ==== Military Division General Sir Roger Neil Wheeler, , (475595), late The Royal Irish Regiment. Civil Division Sir Anthony Michael William Battishill, , Chairman, Board of Inland Revenue.
=== Causality === Early case-control studies clearly showed a close association between smoking and lung cancer, but contemporary doctors and scientists did not feel evidence existed for causality. Follow-up large prospective cohort studies in the early 1950s showed clearly that smokers died faster, and were more likely to die of lung cancer, cardiovascular disease, and a list of other diseases which lengthened as the studies continued The British Doctors Study, a longitudinal study of some 40,000 doctors, began in 1951. By 1954 it had evidence from three years of doctors' deaths, based on which the government issued advice that smoking and lung cancer rates were related (the British Doctors Study last reported in 2001, by which time there were approximately 40 linked diseases). The British Doctors Study demonstrated that about half of the persistent cigarette smokers born in 1900–1909 were eventually killed by their addiction.
Arsenic (III) binding sites usually use thiol groups of cysteine residues. The catalysis involves thiolates of Cys72, Cys174, and Cys224. In an SN2 reaction, the positive charge on the SAM sulfur atom pulls the bonding electron from the carbon of the methyl group, which interacts with the arsenic lone pair to form an As−C bond, leaving SAH.
Sources: en.wikipedia.org
Although used as a taxonomic category in some pre-Darwinian classifications, e.g., Linnaeus (1753), de Jussieu (1789), Lamouroux (1813), Harvey (1836), Horaninow (1843), Agassiz (1859), Wilson & Cassin (1864), in further classifications, the "algae" are seen as an artificial, polyphyletic group. Throughout the 20th century, most classifications treated the following groups as divisions or classes of algae: cyanophytes, rhodophytes, chrysophytes, xanthophytes, bacillariophytes, phaeophytes, pyrrhophytes (cryptophytes and dinophytes), euglenophytes, and chlorophytes. Later, many new groups were discovered (e.g., Bolidophyceae), and others were splintered from older groups: charophytes and glaucophytes (from chlorophytes), many heterokontophytes (e.g., synurophytes from chrysophytes, or eustigmatophytes from xanthophytes), haptophytes (from chrysophytes), and chlorarachniophytes (from xanthophytes). With the abandonment of plant-animal dichotomous classification, most groups of algae (sometimes all) were included in Protista, later also abandoned in favour of Eukaryota. However, as a legacy of the older plant life scheme, some groups that were also treated as protozoans in the past still have duplicated classifications (see ambiregnal protists).
The alkalides are an exception: they are unstable compounds which contain alkali metals in a −1 oxidation state, which is very unusual as before the discovery of the alkalides, the alkali metals were not expected to be able to form anions and were thought to be able to appear in salts only as cations. The alkalide anions have filled s-subshells, which gives them enough stability to exist. All the stable alkali metals except lithium are known to be able to form alkalides, and the alkalides have much theoretical interest due to their unusual stoichiometry and low ionisation potentials. Alkalides are chemically similar to the electrides, which are salts with trapped electrons acting as anions. A particularly striking example of an alkalide is "inverse sodium hydride", H+Na− (both ions being complexed), as opposed to the usual sodium hydride, Na+H−: it is unstable in isolation, due to its high energy resulting from the displacement of two electrons from hydrogen to sodium, although several derivatives are predicted to be metastable or stable. In aqueous solution, the alkali metal ions form aqua ions of the formula [M(H2O)n]+, where n is the solvation number. Their coordination numbers and shapes agree well with those expected from their ionic radii. In aqueous solution the water molecules directly attached to the metal ion are said to belong to the first coordination sphere, also known as the first, or primary, solvation shell. The bond between a water molecule and the metal ion is a dative covalent bond, with the oxygen atom donating both electrons to the bond.
=== New Zealand === Although absinthe is not prohibited at the national level, some local authorities have banned it. The latest is Mataura in Southland. The ban came in August 2008 after several issues of misuse drew public and police attention. One incident resulted in breathing difficulties and hospitalising of a 17-year-old for alcohol poisoning. The particular brand of absinthe that caused these effects was bottled at 89% ABV.
Hydrothermal plumes represent an important mechanism through which hydrothermal systems influence marine biogeochemistry. Hydrothermal vents emit a wide variety of trace metals into the ocean, including Fe, Mn, Cr, Cu, Zn, Co, Ni, Mo, Cd, V, and W, many of which have biological functions. Numerous physical and chemical processes control the fate of these metals once they are expelled into the water column. Based on thermodynamic theory, Fe2+ and Mn2+ should oxidize in seawater to form insoluble metal (oxy)hydroxide precipitates; however, complexation with organic compounds and the formation of colloids and nanoparticles can keep these redox-sensitive elements suspended in solution far from the vent site. Fe and Mn often have the highest concentrations among metals in acidic hydrothermal vent fluids, and both have biological significance, particularly Fe, which is often a limiting nutrient in marine environments. Therefore, far-field transport of Fe and Mn via organic complexation may constitute an important mechanism of ocean metal cycling. Additionally, hydrothermal vents deliver significant concentrations of other biologically important trace metals to the ocean such as Mo, which may have been important in the early chemical evolution of the Earth's oceans and to the origin of life (see "theory of hydrothermal origin of life"). However, Fe and Mn precipitates can also influence ocean biogeochemistry by removing trace metals from the water column.
== Annual reconstitution == Russell rebalances its indexes once each year in June, called "reconstitution". The reconstitution consists of updating the global list of investable stocks and assigning them to the appropriate indices. The Russell indexes do not immediately replace a company that merges with another firm or has its stock delisted. However, Russell adds initial public offerings (IPOs) on a quarterly basis, capturing these stocks in a systematic way. Abnormal trading volumes caused by index fund managers re-balancing their portfolios has a history of significant market impact during the last few seconds before the New York Stock Exchange and NASDAQ closing prices are determined. The index rebalance is typically scheduled for the closing price on the last Friday in June.
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 associated with the melanocortin receptor family, particularly subtypes found in the central nervous system. This interaction is separate from the adrenal pathway activated by full-length ACTH.