Everything below concerns somatotroph. We keep the language plain, cite what the science says, and separate well-supported claims from open questions.
Last reviewed on 2025-12-28. Where a claim depends on a specific study, the study is described rather than over-claimed.
The distinguishing feature of the DAC form is a maleimide-containing group that reacts with the free thiol of cysteine-34 on human serum albumin. This reaction forms a covalent bond without enzymatic assistance, and it takes place after the peptide enters the bloodstream. Because albumin is abundant and long-lived, the attached peptide is carried through circulation far longer than an unmodified fragment would survive. The chemistry is a deliberate pharmacokinetic strategy rather than a change to receptor activity.
Enzymatic protection is a separate mechanism from plasma protein binding. The four substitutions in the backbone reduce recognition by dipeptidyl peptidase IV, which normally cleaves the natural hormone within minutes. Without the reactive group, this resistance still yields only a short window of activity, generally reported in the range of tens of minutes. With it, reported half-lives in early human work extended to several days. The size of that gap is the main practical distinction between the two materials.
Both forms act at the pituitary receptor for growth hormone-releasing hormone and increase growth hormone output, which in turn raises insulin-like growth factor 1. A long-acting analog produces sustained rather than pulsatile stimulation, and the physiological consequences of that pattern are not fully settled. Published human data on the extended form remain limited, and much of what circulates in discussion traces to early company reports rather than independent replication. How sustained exposure affects normal feedback remains an open question.
Clearance profiles diverge sharply between the two versions. The albumin-binding molecule stays in plasma for several days, whereas the unmodified analog is largely gone within about half an hour in reported work. Cleavage by dipeptidyl peptidase IV is a major contributor to the short life of the unmodified sequence. These gaps mean the two versions cannot be substituted for each other in study design or in reading results side by side.
Reports on this compound commonly follow serum growth hormone and insulin-like growth factor 1 across defined time windows. Protocols differ in sampling frequency, assay platform, and participant characteristics, which makes direct comparison between publications difficult. Some work focuses on pulsatile release patterns instead of average concentrations. Whether repeated exposure alters endogenous hormone rhythms over long periods remains an open question, and the formal literature is thinner than the volume of informal commentary implies.
| Property | Value | Notes |
|---|---|---|
| Duration with linker | Several days | Reported in early human work |
| Duration without linker | Tens of minutes | Short plasma residence |
| Albumin attachment site | Cysteine-34 | Covalent maleimide reaction |
| Primary receptor | Pituitary GHRH receptor | Stimulates growth hormone release |
| Downstream marker | Insulin-like growth factor 1 | Indirect measure of activity |
Two forms circulate under the CJC-1295 name, and they differ by a single appended group. The version without a drug affinity complex carries four substitutions along the peptide chain, including a D-alanine near the amino terminus and replacements at three other positions. These changes block the enzyme dipeptidyl peptidase IV and remove a methionine residue that is prone to oxidation. The modified fragment is frequently labeled MOD GRF 1-29. Naming conventions are inconsistent across informal sources, which is a common source of confusion.
The second form adds a maleimide-bearing linker to the lysine at the carboxyl end. This group reacts with cysteine-34 on circulating serum albumin, forming a covalent bond that keeps the peptide in the bloodstream for far longer. ConjuChem developed the molecule as a way to extend the action of a peptide without frequent administration. The albumin attachment is the defining structural feature of the drug affinity complex version. Whether continuous exposure produces effects distinct from shorter pulses remains an unresolved research question.
Reported half-lives differ widely between the two variants and between species. Values for the albumin-binding form are usually expressed in days, while the unconjugated form is measured in minutes to a few hours. Sampling schedules, assay sensitivity, and route of administration all influence the numbers, which limits direct comparison across studies. Whether sustained receptor occupancy produces different downstream effects from pulsatile stimulation remains an open question in the published work. Claims about relative potency should therefore be read alongside the specific study design that produced them.
Lyophilised powder is the usual supplied form. The material is hygroscopic, so vials are typically equilibrated to room temperature before opening in order to prevent condensation on the contents. Long-term storage is generally described at minus twenty degrees Celsius or colder, protected from light and moisture. Repeated freeze-thaw cycles are avoided because they promote aggregation and loss of soluble material. A reconstituted solution is considerably less stable than the dry powder and is normally kept refrigerated for short periods only.
Two principal forms appear in the literature and in research supply. One carries a drug affinity complex, a maleimide-based group that forms a covalent bond with circulating albumin. This linkage slows clearance and produces a long-lasting elevation of peptide levels. The other form lacks that group and is often labeled MOD GRF(1-29). It has a much shorter circulation time. Both variants retain the same core receptor-binding sequence. Reported half-lives differ substantially between the two.
At the pituitary, the peptide binds the growth hormone-releasing hormone receptor on somatotroph cells. Receptor activation raises intracellular cyclic AMP and triggers release of stored growth hormone. Somatostatin and other hypothalamic signals modulate this response. Negative feedback from insulin-like growth factor 1 also influences output. The same regulatory architecture operates with the native hormone. Whether the synthetic analog alters feedback dynamics over repeated exposure remains an open question. Most published receptor work uses cell models rather than intact human systems.
CJC-1295 is a synthetic peptide belonging to the growth hormone-releasing hormone analog family. It comprises twenty-nine amino acid residues derived from the N-terminal region of natural GHRH. The molecule incorporates several non-natural substitutions that increase resistance to enzymatic degradation. These modifications extend its activity compared with the native hormone fragment. Researchers use it to study pituitary growth hormone secretion in laboratory and clinical settings. This compound is distinct from native GHRH in its stability profile.
==== Increase in cancer risk ==== The IARC concluded that if unprocessed red meat does cause cancer, there is a 17% higher risk of colorectal cancer for every 100 g of unprocessed red meat consumed daily. It found an 18% higher risk of colorectal cancer for every 50 g of processed red meat consumed daily. A 2021 umbrella review reported an increase of 11–51% risk of multiple cancer per 100g/d increment of red meat, and an increase of 8–72% risk of multiple cancer per 50g/d increment of processed meat. A 2022 Burden of Proof study analyzed data from epidemiological evidence (not mechanistic evidence) and found that each 100 g of unprocessed red meat consumed per day would increase colorectal cancer risk by at least 6% and breast cancer by at least 3%. The Burden of Proof methodology was later criticized for systematically under-estimating levels of risk.
=== Toxicity === In 2009, one case of sympathomimetic toxicity was reported in the UK after a person took 0.2 g of mephedrone orally, and after this did not achieve the desired effect, intramuscularly injected 3.8 g mixed with water into his thighs. Shortly afterwards, the user "developed palpitations, blurred tunnel vision, chest pressure and sweating". The patient was treated with 1 mg of lorazepam and the sympathomimetic features decreased and the user was discharged within six hours of arrival. One case of serotonin syndrome has been reported, where the patient was already prescribed fluoxetine and olanzapine, and then took 40 tablets containing mephedrone in one night. He was treated with lorazepam and discharged 15 hours after admission. Both enantiomers of methcathinone, which differs only in the lack of the methyl group on the phenyl ring when compared to mephedrone, have been shown to be toxic to rat dopamine neurons, and the S-enantiomer was also toxic against serotonin neurons. Simon Gibbons and Mire Zloh of the School of Pharmacy, University of London stated, based on the chemical similarities between methcathinone and mephedrone, "it is highly likely that mephedrone will display neurotoxicity". However, Brunt and colleagues stated, "extreme caution" should be used when inferring the toxicity of mephedrone from methcathinone, noting some of the toxicity associated with methcathinone is due to manganese impurities related to its synthesis, rather than the compound itself.
Annie Pardo studied biology at the Faculty of Sciences of the National Autonomous University of Mexico. She also completed her master's and doctoral degrees in biochemistry at the same university. She conducted research stays at the American universities of Washington University in St. Louis; at the University of Illinois Chicago, and at the pathology department of the Baylor College of Medicine in Houston, Texas. In 1980, she founded the biochemistry research laboratory at the Faculty of Sciences of UNAM. She was a "C-level" professor at the Faculty of Sciences of the National Autonomous University of Mexico and was named a "level III researcher" of the Sistema Nacional de Investigadores. In May 2023, she received the National Prize for Arts and Sciences in the category of physical-mathematical and natural sciences for "her research in biochemistry, lung diseases, and aging studies".
Two neptunium oxyselenide compounds are known, NpOSe and Np2O2Se, are formed with similar methods by replacing the neptunium hydride with neptunium dioxide. The known neptunium telluride compounds NpTe, NpTe3, Np3Te4, Np2Te3, and Np2O2Te are formed by similar procedures to the selenides and Np2O2Te is isostructural to the equivalent uranium and plutonium compounds. No neptunium−polonium compounds have been reported.
Sources: en.wikipedia.org
=== Reconstituted Fearsome Foursome and rejecting name === After missing the playoffs from 1970 to 1972, the Rams won seven straight division titles from 1973 to 1979, which was an NFL record until 2016 when broken by the New England Patriots. Those Rams teams were led in part by a reconstituted "new" Fearsome Foursome. This line consisted of ends Jack Youngblood and Fred Dryer, and tackles Olsen and Larry Brooks. Youngblood played for the Rams from 1971 to 1984, Brooks from 1972 to 1982, and Dryer from 1972 to 1981. Olsen, who played with his brother Phil Olsen for 4 seasons from 1971 to 1974, retired after a 15-year career at the end of the 1976 season. Olsen was replaced by Cody Jones in 1977-78. Jones suffered an Achilles tendon injury and missed the 1979 season, being replaced by Mike Fanning in 1979. Jones was the starter at right defensive tackle again in 1980. Brooks, Youngblood and Dryer, however, rejected the name Fearsome Foursome as applied to themselves, considering it unnecessary. Youngblood thought it amounted to gratuitous showmanship and the Rams' defensive players believed the team's play, not its name, was the only thing that had actual meaning. Thus, the defensively excellent 1978 team, which gave up the league’s fewest total yards and fewest passing yards, was not even considered to have a nickname, unlike the "Doomsday Defense" or "Steel Curtain". Youngblood, Dryer, Brooks and Fanning started in Super Bowl XIV following the 1979 season. Youngblood and Olsen are NFL Hall of Famers while Brooks made the Pro Bowl 5 times.
Rather than binding specific ligands, olfactory receptors display affinity for a range of odorant molecules, and conversely a single odorant molecule may bind to a number of olfactory receptors with varying affinities, which depend on physio-chemical properties of molecules like their molecular volumes. Once the odorant has bound to the odorant receptor, the receptor undergoes structural changes and it binds and activates the olfactory-type G protein on the inside of the olfactory receptor neuron. The G protein (Golf and/or Gs) in turn activates the lyase – adenylate cyclase – which converts ATP into cyclic AMP (cAMP). The cAMP opens cyclic nucleotide-gated ion channels which allow calcium and sodium ions to enter into the cell, depolarizing the olfactory receptor neuron and beginning an action potential which carries the information to the brain.
== March 2016 reconstitution == In December 2015, Kim Hames announced his intention to resign as deputy leader of the Liberal Party (and thus also as deputy premier) with effect from February 2016. Liza Harvey was elected unopposed as his successor, with a resultant ministerial reshuffle that took effect from 31 March 2016. Another reshuffle took place on 22 September 2016, with the resignations of Dean Nalder and Tony Simpson. All ministers are listed in order of seniority.
==== Vitamin C ==== Ascorbic acid or vitamin C, an oxidation-reduction (redox) catalyst found in both animals and plants, can reduce, and thereby neutralize, ROS, such as hydrogen peroxide. In addition to its direct antioxidant effects, ascorbic acid is also a substrate for the redox enzyme ascorbate peroxidase, a function that is used in stress resistance in plants. Ascorbic acid is present at high levels in all parts of plants and can reach concentrations of 20 millimolar in chloroplasts.
==== MeSH E05.337.550 – drug evaluation, preclinical ==== MeSH E05.337.550.200 – drug screening assays, antitumor MeSH E05.337.550.200.800 – tumor stem cell assay MeSH E05.337.550.200.900 – xenograft model antitumor assays MeSH E05.337.550.200.900.830 – subrenal capsule assay MeSH E05.337.550.400 – microbial sensitivity tests MeSH E05.337.550.400.800 – serum bactericidal test MeSH E05.337.550.600 – parasitic sensitivity tests
Sources: en.wikipedia.org
== History == FT-ICR was invented by Melvin B. Comisarow and Alan G. Marshall at the University of British Columbia. The first paper appeared in Chemical Physics Letters in 1974. The inspiration was earlier developments in conventional ICR and Fourier-transform nuclear magnetic resonance (FT-NMR) spectrometry. Marshall has continued to develop the technique at The Ohio State University and Florida State University.
== Pharmaceuticals == The vaccine vial monitors are a family of TTIs used by the World Health Organization to track the degradation of vaccines. This is important as many places in the world do not have a reliable cold chain and vaccines tend to spend some time not refrigerated. Based on data on how long a vaccine stays useful at different temperatures, a VVM that matches the vaccine's degradation behavior is chosen. The VVM takes into account all heat exposures except for small peaks. TTIs are also used to protect other heat-sensitive drugs, many of which are complex biologics. Vaccines are a kind of biologics.
== Etymology == The term tempe is thought to be derived from the Old Javanese tumpi, a whitish food made of fried batter made from sago or rice flour which resembles rempeyek. The historian Denys Lombard also suggests that it could be linked to a later term tape or tapai which means 'fermentation'. In the western world, tempeh rather than tempe is the most common spelling, to emphasise that the final "e" is pronounced. The first known usage of this spelling is in an 1896 German article. Other spellings, such as témpé, were also used, but tempeh has become the standard spelling in English since the 1960s.
The Australian Wagyu Association is the largest breed association outside Japan. Both fullblood and Wagyu-cross cattle are farmed in Australia for domestic and overseas markets, including China, Denmark, France, Germany, Hong Kong, Indonesia, Singapore, Taiwan, the United Kingdom and the United States. Australian Wagyu cattle are grain fed for the last 300–500 days of production. Wagyu bred in Western Australia's Margaret River region often have red wine added to their feed as well.
Most modern cultures mark the location of the body with a headstone. This serves two purposes. First, the grave will not accidentally be exhumed. Second, headstones often contain information or tributes to deceased. This is a form of remembrance for loved ones; it can also be viewed as a form of immortality, especially in cases of famous people's graves. Such monumental inscriptions may subsequently be useful to genealogists and family historians. In many cultures graves will be grouped, so the monuments make up a necropolis, a "city of the dead" paralleling the community of the living.
Sources: en.wikipedia.org
A maleimide moiety reacts with the thiol of cysteine-34, forming a covalent bond. The reaction occurs in circulation without enzymatic catalysis.
The group is intended to alter distribution and persistence, not receptor engagement. The peptide portion still binds the pituitary receptor, so the primary difference is duration rather than potency.
Not firmly. Early reports describe several days for the extended form, but independent confirmations are sparse, and values vary with assay method and study design.
It acts on the growth hormone-releasing hormone receptor found on pituitary somatotroph cells. Activation of that receptor triggers growth hormone release through a cyclic AMP dependent pathway.