A practical reference on peptidase cleavage: what it is, how it behaves, what the literature reports, and where the honest uncertainties sit.
Reviewed 2026-01-27. Anything still debated is marked as such rather than presented as settled.
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.
Published studies examine a fairly narrow set of endpoints. Rodent experiments commonly measure maze learning, infarct volume after induced ischemia, and tissue levels of neurotrophic factors. Clinical reports from Russian centres describe attention, memory and recovery scores in patients after stroke or transient ischemic attack. Most of those human studies are small and few have been repeated by independent groups. Outcome measures differ between studies, which limits direct comparison.
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 |
|---|---|---|
| Appearance | White to off-white powder | Lyophilized solid from research suppliers |
| Solubility | Freely soluble in water | Also dissolves in aqueous buffers; solutions are used fresh |
| Typical storage temperature | -20 °C for lyophilized powder | Short-term transport at 2-8 °C is common |
| Common analytical method | Reverse-phase HPLC | Paired with mass spectrometry for identity confirmation |
| Common synonyms | ACTH(4-10) analogue; MEHFPGP | N-terminal methionine retained in the chain |
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.
24998Cf + 157N → 260105 + 4 n These results did not confirm the JINR findings regarding the 9.4 MeV or 9.7 MeV alpha decay of 260105, leaving only 261105 as a possibly produced isotope. JINR then attempted another experiment to create element 105, published in a report in May 1970. They claimed that they had synthesized more nuclei of element 105 and that the experiment confirmed their previous work. According to the paper, the isotope produced by JINR was probably 261105, or possibly 260105. This report included an initial chemical examination: the thermal gradient version of the gas-chromatography method was applied to demonstrate that the chloride of what had formed from the SF activity nearly matched that of niobium pentachloride, rather than hafnium tetrachloride. The team identified a 2.2-second SF activity in a volatile chloride portraying eka-tantalum properties, and inferred that the source of the SF activity must have been element 105. In June 1970, JINR made improvements on their first experiment, using a purer target and reducing the intensity of transfer reactions by installing a collimator before the catcher. This time, they were able to find 9.1 MeV alpha activities with daughter isotopes identifiable as either 256103 or 257103, implying that the original isotope was either 260105 or 261105.
=== Project REWARD === The REWARD (Real time wide area radiation surveillance system) project was established to address the threats of nuclear terrorism, missing radioactive sources, radioactive contamination and nuclear accidents. The consortium developed a mobile system for real time wide area radiation monitoring based on the integration of new miniaturized solid state sensors. Two sensors are used: a cadmium zinc telluride (CdZnTe) detector for gamma radiation and a high efficiency neutron detector based on novel silicon technologies. The gamma and neutron detectors are integrated into a single monitoring device called a tag. The sensor unit includes a wireless communication interface to remotely transmit data to a monitoring base station, which also uses a GPS system to calculate the tag's position.
=== Mass Spectrometry === Mass spectrometry confirms molecular mass and provides insights into cage assembly processes. High-resolution mass spectrometry precisely determines the molecular weight of completed cages and can identify reaction intermediates during synthesis. The technique is particularly valuable for large cage structures where multiple charge states may be observed. Tandem mass spectrometry reveals fragmentation patterns that confirm structural assignments and can provide information about the strength of various bonds within the cage framework. Modern ionization techniques enable the study of host-guest complexes, offering insights into molecular recognition properties.
Sources: en.wikipedia.org
The best model relating log K and log P was found to be one in which the total molar charge of a compound at a given pH is included as a variable. This model proved to give fairly accurate predictions of log P, R > 0.9. Other studies have been performed which develop predictive QRAR models for tricyclic antidepressants and barbiturates.
Since the 1920s, pedoscopes have been installed in many shoe stores in North America and Europe, more than 10,000 in the U.S. alone, following the invention of Jacob Lowe, a Boston physicist. They were X-ray machines used to check the fit of shoes and to promote sales, especially to children. Children were particularly fascinated by the sight of their footbones. X-rays were often taken several times daily to evaluate the fit of different shoes. Most were available in shoe stores until the early 1970s. The energy dose absorbed by the customer was up to 116 rads, or 1.16 grays. In the 1950s, when medical knowledge of the health risks was already available, pedoscopes came with warnings that shoe-buyers should not be scanned more than three times a day and twelve times a year. By the early 1950s, several professional organizations issued warnings against the continued use of shoe-mounted fluoroscopes, including the American Conference of Governmental Industrial Hygienists, the American College of Surgeons, the New York Academy of Medicine, and the American College of Radiology. At the same time, the District of Columbia enacted regulations requiring that shoe-mounted fluoroscopes be operated only by a licensed physical therapist. A few years later, the state of Massachusetts passed regulations stating that these machines could only be operated by a licensed physician. In 1957, the use of shoe-mounted fluoroscopes was banned by court order in Pennsylvania.
Protein chemical synthesis by native peptide ligation of unprotected peptide segments is an interesting complement and potential alternative to the use of living systems for producing proteins. The synthesis of proteins requires efficient native peptide ligation methods, which enable the chemoselective formation of a native peptide bond in aqueous solution between unprotected peptide segments. The most frequently used technique for synthesizing proteins is Native chemical ligation (NCL). However, alternatives are emerging, one of which is SEA Native Peptide Ligation.
== Genetics == The genetics of Bruck syndrome differs from osteogenesis imperfecta. Osteogenesis imperfecta usually involves autosomal dominant mutations to COL1A1 or COL1A2 which encode type 1 procollagen. Bruck syndrome is linked to mutations in two genes, and therefore is divided in two types. Bruck syndrome type 1 is caused by a homozygous mutation in the FKBP10 gene. Type 2 is caused by a homozygous mutation in the PLOD2 gene.
Sources: en.wikipedia.org
Peukert argued that the very growth of the welfare state under the Weimar Republic ensured the backlash when social problems were not solved was especially severe. Peukert wrote: "Weimar installed the new principle of the social state, in which, on the one hand, the citizen could now claim public assistance in (his/her) social and personal life, while on the other, the state set up the institutional and normative framework, (defining how) a 'normal' life of the citizen of the state could progress...This process, which had already began before the turn of the century, reached its apex in the Weimar Republic and was also thrown into crisis, as the limits of social technology could achieve were reached in every direction". Peukert wrote that after the First World War, the pre-war mood of optimism gave way to disillusionment as German bureaucrats found social problems to be more insolvable than at first thought, which in turn, guided by the prevailing Social Darwinist and eugenicist values led them to place increasing emphasis on saving the biologically "fit" while the biologically "unfit" were to be written off. Peukert used as an example the fact that social workers had before the First World War had believed it was possible to ensure that every child in Germany was brought up in a happy home and by 1922 were instead declaring that certain young people were "biologically" prone to being "unfit", requiring a law on detention that was to remove them from society forever.
== Inventions == James Watt did not invent the steam engine, nor were his ideas on steam engine power inspired by a kettle lid pressured open by steam. Watt improved upon the already commercially successful Newcomen atmospheric engine (invented in 1712 by Thomas Newcomen) in the 1760s and 1770s, making certain improvements critical to its future usage; his new steam engine later gained huge fame as a result. Although the guillotine was named after the French physician Joseph-Ignace Guillotin, he neither invented nor was executed with this device. He died peacefully in his own bed in 1814. Rather, it was Guillotin's speech favoring beheadings over other forms of execution that led to the device being referred to as "La machine Guillotine" and later simply guillotine. Thomas Crapper did not invent the flush toilet. A forerunner of the modern toilet was invented by the Elizabethan courtier Sir John Harington in the 16th century, and in 1775 the Scottish mechanic Alexander Cumming developed and patented a design for a toilet with an S-trap and flushing mechanism. Crapper, however, did much to increase the popularity of the flush toilet and introduced several innovations in the late 19th century, holding nine patents, including one for the floating ballcock. Thomas Edison did not invent the light bulb.
That is how this entire mass of suffering originates.The Mahahatthipadopama-sutta (M 28) contains another short explanation of dependent origination:these five grasping aggregates are indeed dependently originated. The desire, adherence, attraction, and attachment for these five grasping aggregates is the origin of suffering. Giving up and getting rid of desire and greed for these five grasping aggregates is the cessation of suffering.
Sources: en.wikipedia.org
It consists mainly of animal experiments and small clinical reports, with much of the clinical material published in Russian-language journals. Large independent trials are scarce. Separating reliable effects from chance findings is consequently difficult.
A fraction of an intranasal dose is thought to reach the central nervous system, and this route is favoured partly for that reason. The proportion is not well characterized. Direct measurement in humans remains difficult with current methods.
Raised BDNF and NGF expression has been reported across several animal studies, which makes the signal fairly consistent. Whether the same change occurs in humans at usable doses is not established. It is best treated as a working hypothesis rather than a confirmed clinical mechanism.
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.