Everything below concerns intranasal delivery. We keep the language plain, cite what the science says, and separate well-supported claims from open questions.
Updated 2025-11-14. Numbers and descriptions here follow the published literature rather than marketing material.
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.
== Risk factors == Hospitals are primary transmission sites for CRE-based infections. Up to 75% of hospital admissions attributed to CRE were from long-term care facilities or transferred from another hospital. Suboptimal maintenance practices are the largest cause of CRE transmission. This includes the failure to adequately clean and disinfect medication cabinets, other surfaces in patient rooms, and portable medical equipment, such as X-ray and ultrasound machines that are used for both CRE and non-CRE patients. Thus far, CRE have primarily been nosocomial infectious agents. Almost all CRE infections occur in people receiving significant medical care in hospitals, long-term acute care facilities, or nursing homes. Independent risk factors for CRE infection include use of beta-lactam antibiotics and the use of mechanical ventilation. Patients with diabetes have also been shown to be at an elevated risk for acquiring CRE infections. When compared to other hospitalized patients, those admitted from long-term acute care (LTAC) facilities have significantly higher incidence of colonization and infection rates. Another 2012 multicenter study found that over 30% of patients with recent exposure to LTAC were colonized or infected with CRE. A person susceptible to CRE transmission is more likely to be female, have a greater number of parenteral nutrition-days (days when the person received nutrition via the bloodstream), and to have had a significant number of days breathing through a ventilator.
=== Collegiate === North Carolina State University is located in southwest Raleigh where the Wolfpack competes nationally in 24 intercollegiate varsity sports as a member of the Atlantic Coast Conference. The university's football team plays in Carter–Finley Stadium, the second largest football stadium in North Carolina, while the men's basketball team shares the Lenovo Center with the Carolina Hurricanes hockey club. The Wolfpack women's basketball, volleyball, and gymnastics as well as men's wrestling events are held on campus at Reynolds Coliseum. The men's baseball team plays at Doak Field.
== mTOR == Activators: beta-Hydroxy beta-methylbutyric acid Hydroxynorketamine Leucine NV-5138 Inhibitors: Rapalogs: Everolimus Ridaforolimus Sirolimus (Rapamycin) Temsirolimus Umirolimus Zotarolimus; ATP-competitive / indirect: Berberine Curcumin Dactolisib EF-24 Epigallocatechin gallate HY-124798 NV-5440 Pterostilbene Quercetin Resveratrol Sapanisertib Torin-1 WYE-687 XL-388
== Medical uses == Synthetic cannabinoids can provide psychotropic effects such as relieving nausea and dizziness. Phenethylamine can relieve depressive symptoms while Alprazolam can treat insomnia, panic attack and anxiety. The most common delivery routes of Alprazolam and Phenethylamine are by oral administration. Both of which are available in the dosage forms of pills and tablets. Synthetic cannabinoids are naturally in solid and oil form and are delivered by smoking.
==== Histone O-GlcNAcylation ==== Histone proteins, the primary protein component of chromatin, have been reported to be modified by O-GlcNAc, though other studies have not been able to detect histone O-GlcNAc. The presence of O-GlcNAc on histones has been suggested to affect gene transcription as well as other histone marks such as acetylation and monoubiquitination. TET2 has been reported to interact with the TPR domain of OGT and facilitate recruitment of OGT to histones. Phosphorylation of OGT T444 via AMPK has been found to inhibit OGT-chromatin association and downregulate H2B S112 O-GlcNAc.
Sources: en.wikipedia.org
Arboreal animals frequently have elongated limbs that help them cross gaps, reach fruit or other resources, test the firmness of support ahead and, in some cases, to brachiate (swing between trees). Many arboreal species, such as tree porcupines, silky anteaters, spider monkeys, and possums, use prehensile tails to grasp branches. In the spider monkey, the tip of the tail has either a bare patch or adhesive pad, which provides increased friction. Claws can be used to interact with rough substrates and reorient the direction of forces the animal applies. This is what allows squirrels to climb tree trunks that are so large to be essentially flat from the perspective of such a small animal. However, claws can interfere with an animal's ability to grasp very small branches, as they may wrap too far around and prick the animal's own paw. Frictional gripping is used by primates, relying upon hairless fingertips. Squeezing the branch between the fingertips generates frictional force that holds the animal's hand to the branch. However, this type of grip depends upon the angle of the frictional force, thus upon the diameter of the branch, with larger branches resulting in reduced gripping ability. To control descent, especially down large diameter branches, some arboreal animals such as squirrels have evolved highly mobile ankle joints that permit rotating the foot into a 'reversed' posture. This allows the claws to hook into the rough surface of the bark, opposing the force of gravity.
== History == The first description of phenylalanine was made in 1879, when Schulze and Barbieri identified a compound with the empirical formula, C9H11NO2, in yellow lupine (Lupinus luteus) seedlings. In 1882, Erlenmeyer and Lipp first synthesized phenylalanine from phenylacetaldehyde, hydrogen cyanide, and ammonia. The genetic codon for phenylalanine was first discovered by J. Heinrich Matthaei and Marshall W. Nirenberg in 1961. They showed that by using mRNA to insert multiple uracil repeats into the genome of the bacterium E. coli, they could cause the bacterium to produce a polypeptide consisting solely of repeated phenylalanine amino acids. This discovery helped to establish the nature of the coding relationship that links information stored in genomic nucleic acid with protein expression in the living cell.
== Bibliography == Greensmith, M. (1998). Practical Dehydration. Woodhead Publishing, Ltd. Genskow, L.R.; Beimesch, W.E.; Hecht, J.P.; Kemp, I.C.; Langrish, T.; Schwartzbach, C.; Smith, (F).L. (2007). Chemical Engineers' Handbook. Mc Graw Hill Professional. pp. Chapter 12 (Evaporative Cooling and Solids Drying). A.S., Mujumdar (1998). Handbook of Industrial Drying. Boca Ratón: CRC Press.
These fears of subversive Peruvians were also fueled by the widely publicized kidnapping, together with the collection of a ransom of 1,000,000 dollars, of the Bolivian businessman and politician Samuel Doria Medina; a fact that was carried out by Peruvians (also classified as subversives) members of the Tupac Amaru Revolutionary Movement (MRTA). All of which were events that generated a very bad reputation for Peruvians among Bolivian society, being incited by said prejudices and stereotypes by the morbidity of the press. Despite everything, Bolivian institutions report that, in the prison population of in that country, it is not a reality that the number of Peruvian prisoners is proportionally greater than the Bolivian citizens sentenced to prison. The Commission for Human Rights and Pacification of the Congress of the Republic of Peru has come to examine multiple cases of aggressions and mistreatment in Bolivia, against Peruvian citizens, including Congresswoman Susana Díaz, after a trip to Bolivia, verified the excesses committed against Peruvian groups, coming to denounce that there is an "anti-Peruvian phobia", especially in the Desaguadero.
Clytia hemisphaerica is a small hydrozoan-group cnidarian, about 1 cm in diameter, that is found in the Mediterranean Sea and the North-East Atlantic Ocean. Clytia has the free-swimming jellyfish form typical of the Hydrozoa, as well as vegetatively propagating polyps. Clytia hemisphaerica has emerged as a promising model organism as its life cycle, small size, and relatively easy upkeep make it conducive to experimental manipulation and maintenance in a laboratory setting. Some examples of studies already conducted in Clytia include those looking at embryonic development, differential patterns of gene expression during life stages, and wound healing. Clytia's genome was sequenced in full in March 2019.
Sources: en.wikipedia.org
==== Hydrogen peroxide ==== One recent study has found that the wild Salmonella which would reproduce quickly during subsequent dark storage of solar-disinfected water could be controlled by the addition of just 10 parts per million of hydrogen peroxide.
This multidisciplinary approach allows researchers to identify vulnerable populations, characterize disparities in dementia incidence and outcomes, and evaluate interventions that may delay cognitive decline and improve quality of life for aging individuals. A defining strength of CAPAS is its emphasis on health equity and the study of historically underrepresented populations. Investigators examine racial, ethnic, geographic, and socioeconomic disparities in dementia risk, diagnosis, treatment, caregiving, and healthcare utilization, with particular attention to Hispanic, rural, and medically underserved communities throughout South Texas and the United States. By investigating the social determinants of brain health alongside biological mechanisms of aging, the Center provides critical insights into why dementia disproportionately affects certain populations and identifies opportunities to reduce inequities through targeted prevention strategies, public health initiatives, and healthcare policy. The Center also serves as an important resource for methodological innovation in population aging research. Faculty develop and apply advanced analytical approaches—including longitudinal data analysis, causal inference methods, machine learning, geospatial analysis, and health services research—to better understand the complex interactions among aging, chronic disease, cognitive decline, and social determinants of health.
History of sonochemistry – history of the study of the effect of sonic waves and wave properties on chemical systems. History of stereochemistry – history of the study of the relative spatial arrangement of atoms within molecules. History of supramolecular chemistry – history of the area of chemistry beyond the molecules and focuses on the chemical systems made up of a discrete number of assembled molecular subunits or components. History of thermochemistry – history of the study of energy and heat associated with chemical reactions and/or physical transformations. History of phytochemistry – history of the study of phytochemicals. History of polymer chemistry – history of the multidisciplinary science that deals with the chemical synthesis and chemical properties of polymers or macromolecules. History of solid-state chemistry – history of the study of the synthesis, structure, and properties of solid phase materials, particularly, but not necessarily exclusively of, non-molecular solids History of multidisciplinary fields involving chemistry: History of chemical biology – history of the scientific discipline spanning the fields of chemistry and biology that involves the application of chemical techniques and tools, often compounds produced through synthetic chemistry, to the study and manipulation of biological systems. History of chemical oceanography – history of the study of the behavior of chemical elements within the Earth's oceans.
These volumes were held in the Senate wing of the Capitol; one surviving volume was a government account book from 1810. The volume was taken by British Admiral George Cockburn as a souvenir, and was later returned to the U.S. in 1940 by his family. Within a month, Jefferson offered to sell his large personal library as a replacement. He had reconstituted his own collection after losing part of it to a fire. Congress accepted the offer in January 1815, appropriating $23,950 to purchase his 6,487 books. Some House members, including New Hampshire representative Daniel Webster, opposed the purchase, wanting to exclude "books of an atheistical, irreligious, and immoral tendency". Jefferson's collection, gathered over 50 years, covered various subjects and languages, including topics not typically found in a legislative library. He believed all subjects had a place in the Library of Congress, stating:
Selenium is an essential mineral micronutrient for animals, though it is toxic in large doses. In plants, it sometimes occurs in toxic amounts as forage, e.g. locoweed. Selenium is a component of the amino acids selenocysteine and selenomethionine. In humans, selenium is a trace element nutrient that functions as cofactor for glutathione peroxidases and certain forms of thioredoxin reductase. Selenium-containing proteins are produced from inorganic selenium via the intermediacy of selenophosphate (PSeO33−).
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.