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 2025-07-31 and is reviewed periodically as new material appears.
Published research has focused mainly on neurological and cognitive endpoints in animal models, with proposed mechanisms involving brain-derived neurotrophic factor and related signalling pathways. A substantial share of the human data originates from a limited number of research groups, and independent replication in other countries remains sparse. Regulatory status reflects that distribution: the peptide is registered as a medicine in Russia and appears in some neighbouring markets, while elsewhere it is handled as a research chemical without approved therapeutic labelling. Questions about dose-response relationships, long-term effects, and comparability across studies are still open.
Lyophilised powder is normally kept at -20 °C in a desiccated container, with some suppliers recommending -80 °C for long-term archival storage. Repeated freeze-thaw cycles are the most common cause of avoidable loss, so aliquoting before freezing reduces variability between working sessions. Dissolved peptide is far less stable than the dry solid and is usually prepared fresh or held briefly at 4 °C. Aqueous solutions support both hydrolysis of the backbone and oxidation of the N-terminal methionine, and these two routes dominate degradation under ordinary laboratory conditions.
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.
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.
| Property | Value | Notes |
|---|---|---|
| Purity assay | RP-HPLC, UV 214 nm | Typical research grade 95 percent or higher |
| Mass confirmation | ESI-MS or MALDI-TOF | Compared with theoretical value |
| Main degradation route | Methionine oxidation | Sulfoxide formation in solution |
| Powder storage | -20 °C, desiccated | Amber vial, minimal headspace |
| Working solution | Sterile water or saline | Prepare fresh; avoid repeated thawing |
Bicalutamide: A pure antiandrogen. It is effective similarly to flutamide but is much safer as well as better-tolerated. Birth control pills that consist of an estrogen, usually ethinylestradiol, and a progestin are supported by the evidence. They are functional antiandrogens. In addition, certain birth control pills contain a progestin that also has antiandrogenic activity. Examples include birth control pills containing cyproterone acetate, chlormadinone acetate, drospirenone, and dienogest. Cyproterone acetate: A dual antiandrogen and progestogen. In addition to single form, it is also available in some formulations of combined oral contraceptives at a low dosage (see below). It has a risk of liver damage. Eflornithine: Blocks putrescine that is necessary for the growth of hair follicles. Finasteride and dutasteride: 5α-Reductase inhibitors. They inhibit the production of the potent androgen DHT. A meta-analysis showed inconsistent results of finasteride in the treatment of hirsutism. Flutamide: A pure antiandrogen. It has been found to possess equivalent or greater effectiveness than spironolactone, cyproterone acetate, and finasteride in the treatment of hirsutism. However, it has a high risk of liver damage and hence is no longer recommended as a first- or second-line treatment. Flutamide is safe and effective. GnRH analogues: Suppress androgen production by the gonads and reduce androgen concentrations to castrate levels. Metformin: Insulin sensitizer.
For secure communications, the PLA uses the Zhongxing and Fenghuo series of satellites which enable secure data and voice transmission over C-band, Ku-band, and UHF. PLA deployment of anti-satellite and counterspace satellites including those of the Shijian and Shiyan series have also brought significant concern from western nations. The PLA also plays a significant role in the Chinese space program. To date, all the participants have been selected from members of the PLA Air Force. China became the third country in the world to have sent a man into space by its own means with the flight of Yang Liwei aboard the Shenzhou 5 spacecraft on 15 October 2003, the flight of Fei Junlong and Nie Haisheng aboard Shenzhou 6 on 12 October 2005, and Zhai Zhigang, Liu Boming, and Jing Haipeng aboard Shenzhou 7 on 25 September 2008. The PLA started the development of an anti-ballistic and anti-satellite system in the 1960s, code named Project 640, including ground-based lasers and anti-satellite missiles. On 11 January 2007, China conducted a successful test of an anti-satellite missile, with an SC-19 class KKV. The PLA has tested two types of hypersonic space vehicles, the Shenglong Spaceplane and a new one built by Chengdu Aircraft Corporation. Only a few pictures have appeared since it was revealed in late 2007. Earlier, images of the High-enthalpy Shock Waves Laboratory wind tunnel of the CAS Key Laboratory of high-temperature gas dynamics (LHD) were published in the Chinese media. Tests with speeds up to Mach 20 were reached around 2001.
=== Non-competitive inhibitor: Strychnine === Strychnine is a neurotoxin that causes death by affecting nerves that control muscular contraction and cause respiration difficulty. The impulse is transmitted between the synapse through a neurotransmitter called acetylcholine. It is released into the synapse between nerve cells and binds to receptors in the postsynaptic cell. Then an action potential is generated and transmitted through the postsynaptic cell to start a new cycle. Glycine can inhibit the activity of neurotransmitter receptors, thus a larger amount of acetylcholinesterase is required to trigger an action potential. This makes sure that the generation of nerve impulses is tightly controlled. However, this control is broken down when strychnine is added. It inhibits glycine receptors(a chloride channel) and a much lower level of neurotransmitter concentration can trigger an action potential. Nerves now constantly transmit signals and cause excessive muscular contraction, leading to asphyxiation and death.
=== Prokaryotic origins === Ubiquitin is believed to have descended from bacterial proteins similar to ThiS (O32583) or MoaD (P30748). These prokaryotic proteins, despite having little sequence identity (ThiS has 14% identity to ubiquitin), share the same protein fold. These proteins also share sulfur chemistry with ubiquitin. MoaD, which is involved in molybdopterin biosynthesis, interacts with MoeB, which acts like an E1 ubiquitin-activating enzyme for MoaD, strengthening the link between these prokaryotic proteins and the ubiquitin system. A similar system exists for ThiS, with its E1-like enzyme ThiF. It is also believed that the Saccharomyces cerevisiae protein Urm1, a ubiquitin-related modifier, is a "molecular fossil" that connects the evolutionary relation with the prokaryotic ubiquitin-like molecules and ubiquitin. Archaea have a functionally closer homolog of the ubiquitin modification system, where "sampylation" with SAMPs (small archaeal modifier proteins) is performed. The sampylation system only uses E1 to guide proteins to the proteosome. Proteoarchaeota, which are related to the ancestor of eukaryotes, possess all of the E1, E2, and E3 enzymes plus a regulated Rpn11 system. Unlike SAMP which are more similar to ThiS or MoaD, Proteoarchaeota ubiquitin are most similar to eukaryotic homologs.
Food and Drug Administration (FDA) does not approve bromide for the treatment of any disease, and sodium bromide was removed from over-the-counter (OTC) sedative products like Bromo-Seltzer, in 1975. FDA banned organic bromides from OTC sleep aids in 1989. Commercially available organobromine pharmaceuticals include the vasodilator nicergoline, the sedative brotizolam, the anticancer agent pipobroman, and the antiseptic merbromin. Otherwise, organobromine compounds are rarely pharmaceutically useful, in contrast to the situation for organofluorine compounds. Several drugs are produced as the bromide (or equivalents, hydrobromide) salts, but in such cases bromide serves as an innocuous counterion of no biological significance. Organobromine compounds are used as psychedelic and designer drugs such as 2C-B, Bromo-DragonFLY, and 4-Bromomethcathinone. Other uses of organobromine compounds include high-density drilling fluids, dyes (such as Tyrian purple and the indicator bromothymol blue), and pharmaceuticals. Bromine itself, as well as some of its compounds, are used in water treatment, and is the precursor of a variety of inorganic compounds with an enormous number of applications (e.g. silver bromide for photography). Zinc–bromine batteries are hybrid flow batteries used for stationary electrical power backup and storage; from household scale to industrial scale. Bromine is used in cooling towers (in place of chlorine) for controlling bacteria, algae, fungi, and zebra mussels.
Sources: en.wikipedia.org
== Neoantigenic determinant == A neoantigenic determinant is an epitope on a neoantigen, which is a newly formed antigen that has not been previously recognized by the immune system. Neoantigens are often associated with tumor antigens and are found in oncogenic cells. Neoantigens and, by extension, neoantigenic determinants can be formed when a protein undergoes further modification within a biochemical pathway such as glycosylation, phosphorylation or proteolysis. This, by altering the structure of the protein, can produce new epitopes that are called neoantigenic determinants as they give rise to new antigenic determinants. Recognition requires separate, specific antibodies.
During the corresponding period some 8,578 actual downloads of the software were independently logged via the same route at the AIDA Website, giving a response rate for this survey of 45%. Responses were received from participants in 66 countries — over half of these (n=2,137; 55.3%) were from the United States and the United Kingdom. There were 2,318 responses (60.0%) received from people with diabetes and 443 (11.5%) from relatives of patients, with fewer responses from doctors, students, diabetes educators, nurses, pharmacists, and other end users. The authors concluded that the study highlighted "considerable interest amongst patients and their relatives to learn more about balancing insulin and diet in diabetes, as well as possibly to get more involved in self-management of insulin dosages. More computer applications that can cater for this interest in diabetes patient self-care need to be developed and made available. The Internet provides an ideal medium for the distribution of such educational tools".
=== Turkic theory === The theory of Russian historian A. M. Orlov is that Cossacks hosts were formed among Turkic nomads. He then thinks, that the Don Cossacks were originally formed largely by "Meshchera Tatars" under the Golden Horde, which he also connects to later Mishar Tatars. A. V. Mirtov wrote that the life and language of Don Cossacks were heavily influenced by "Tatars from Meshchera". G. Shtekl on the other hand wrote that the first Russian Cossacks were simply "Russified Tatars." V. N. Tatishchev: "Some of them lived in the small cities of Meshchera, their capital being Donskoy, where the Donskoy Monastery is now." A. A. Gordeyev connects them to the Golden Horde also, and states: "They did not fall under the Khans of the Orda, did not accept serfdom, were pained by all kinds of social injustice, and rebelled against feudal rule".
More data on this classification are discoverable at the Expasy metallothionein page.Secondary structure elements have been observed in several MTs SmtA from Syneccochoccus, mammalian MT3, echinoderm SpMTA, fish Notothenia coriiceps MT, crustacean MTH, but until this moment, the content of such structures is considered to be poor in MTs, and its functional influence is not considered. Tertiary structure of MTs is also highly heterogeneous. While vertebrate, echinoderm and crustacean MTs show a bidominial structure with divalent metals as Zn(II) or Cd(II) (the protein is folded so as to bind metals in two functionally independent domains, with a metallic cluster each), yeast and prokaryotic MTs show a monodominial structure (one domain with a single metallic cluster). In yeast, the first 40 residues in the protein wrap around the metal by forming two large parallel loops separated by a deep cleft containing the metal cluster. Although no structural data is available for molluscan, nematoda and Drosophila MTs, it is commonly assumed that the former are bidominial and the latter monodominial. No conclusive data are available for Plant MTs, but two possible structures have been proposed: 1) a bidominial structure similar to that of vertebrate MTs; 2) a codominial structure, in which two Cys-rich domains interact to form a single metallic cluster. Quaternary structure has not been broadly considered for MTs.
The country was mostly savannah, although the moist and mountainous eastern highlands supported areas of tropical evergreen and hardwood forests. Trees found in these Eastern Highlands included teak, mahogany, enormous specimens of strangling fig, forest newtonia, big leaf, white stinkwood, chirinda stinkwood, knobthorn and many others. In the low-lying parts of the country, fever trees, mopane, combretum and baobabs abound. Much of the country was covered by miombo woodland, dominated by brachystegia species and others. Among the numerous flowers and shrubs were hibiscus, flame lily, snake lily, spider lily, leonotus, cassia, tree wisteria and dombeya. There were around 350 species of mammals that can be found in Rhodesia. There were also many snakes and lizards, over 500 bird species, and 131 fish species.
Sources: en.wikipedia.org
==== Lithium ==== The chemistry of lithium shows several differences from that of the rest of the group as the small Li+ cation polarises anions and gives its compounds a more covalent character. Lithium and magnesium have a diagonal relationship due to their similar atomic radii, so that they show some similarities. For example, lithium forms a stable nitride, a property common among all the alkaline earth metals (magnesium's group) but unique among the alkali metals. In addition, among their respective groups, only lithium and magnesium form organometallic compounds with significant covalent character (e.g. LiMe and MgMe2). Lithium fluoride is the only alkali metal halide that is poorly soluble in water, and lithium hydroxide is the only alkali metal hydroxide that is not deliquescent. Conversely, lithium perchlorate and other lithium salts with large anions that cannot be polarised are much more stable than the analogous compounds of the other alkali metals, probably because Li+ has a high solvation energy. This effect also means that most simple lithium salts are commonly encountered in hydrated form, because the anhydrous forms are extremely hygroscopic: this allows salts like lithium chloride and lithium bromide to be used in dehumidifiers and air-conditioners.
Monitoring the sky at 3, 10, 30, 100 and 300 microns, especially at 1, 3, and 10 mm, in order to identify one hundred of the most powerful sources among those observed and at each frequency; Study in detail the properties of quasars and other unusual objects; Search for monochromatic anomalies among the most powerful radio sources (such as a hydroxyl emission line), in the decimeter band; Search for periodic signals (pulsars) of interstellar origin, in the same band; Searches for monochromatic signals of different frequencies, always in the same band. According to Kardashev, only a radio interferometer with a base, either of the order of or larger than the diameter of the Earth, placed in orbital space, would allow listening to centimetric and decimetric frequencies. Once a set of unusual sources has been selected, the next step is to look for significant content in the radiations from these objects. In 1998, Nikolai Kardashev, S. F. Likhachev, and V. I. Zhuravlev proposed two SETI space projects to detect artificial sources: the Millimetron project (an orbiting observatory with a 10 m diameter mirror) and the VLBI optical telescope (for interferometric synthesis of ultraviolet, optical, and infrared images).
Blau syndrome Chronic infantile neurologic cutaneous and articular syndrome Familial cold urticaria (familial cold autoinflammatory syndrome) Familial Mediterranean fever Hyper-IgD syndrome Majeed syndrome Muckle–Wells syndrome TNF receptor associated periodic syndrome (familial Hibernian fever, TRAPS, tumor necrosis factor receptor associated periodic syndrome)
Global reductions in gray matter volume, thinning of the parietal and orbitofrontal cortices, and decreased hippocampal activity have been observed in long term users. The effects established so far for recreational use of ecstasy lie in the range of moderate to severe effects for serotonin transporter reduction. Impairments in multiple aspects of cognition, including attention, learning, memory, visual processing, and sleep, have been found in regular MDMA users. The magnitude of these impairments is correlated with lifetime MDMA usage and are partially reversible with abstinence. Several forms of memory are impaired by chronic ecstasy use; however, the effects for memory impairments in ecstasy users are generally small overall. MDMA use is also associated with increased impulsivity and depression. Serotonin depletion following MDMA use can cause depression in subsequent days. In some cases, depressive symptoms persist for longer periods. Some studies indicate repeated recreational use of ecstasy is associated with depression and anxiety, even after quitting the drug. Depression is one of the main reasons for cessation of use. At high doses, MDMA induces a response in the neuroimmune system that, through several mechanisms, increases the permeability of the blood–brain barrier, thereby making the brain more susceptible to environmental toxins and pathogens. In addition, MDMA has immunosuppressive effects in the peripheral nervous system and pro-inflammatory effects in the central nervous system.
Born in Algeria, Sebagh obtained a medical degree from the University of Paris and then learned plastic surgery in Los Angeles. For around 15 years, he worked to rebuild cancer victims' faces and heal burns victims' scarring in Paris's Hôpital Foch. In 1997, he divorced his wife, a Parisian dentist. He has a son and a daughter. Sebagh has a line of skin care products called Dr. Sebagh Anti-Aging marketed by Californian-based direct sales company Guthy-Renker and promoted through TV infomercials.
Sources: en.wikipedia.org
Reversed-phase HPLC gives the main purity figure, most often with UV detection near 214 nanometres. Mass spectrometry then confirms the molecular mass. Together the two methods distinguish a correct sequence from a closely related impurity.
The main chemical risks are methionine oxidation and backbone hydrolysis in solution. Moisture and repeated temperature cycling accelerate both processes. Dry powder held cold and desiccated is considerably more stable than any reconstituted preparation.
It holds a medicine registration in Russia, where it has been used clinically for decades. In most other countries it is treated as a research chemical. That split explains the uneven distribution of clinical literature.
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.