Everything below concerns lyophilized powder. We keep the language plain, cite what the science says, and separate well-supported claims from open questions.
Last reviewed on 2025-09-26. Where a claim depends on a specific study, the study is described rather than over-claimed.
The peptide binds GHRH receptors on somatotroph cells within the anterior pituitary, triggering a signalling cascade that increases growth hormone secretion. Its improved resistance to dipeptidyl peptidase IV degradation distinguishes it from the parent hormone. In the DAC-bearing version, a maleimide group reacts with a cysteine residue on serum albumin, forming a covalent bond that keeps the peptide in circulation far longer. That albumin attachment is the central design feature separating the two research variants.
Pharmacokinetic behaviour differs sharply between the two forms. The DAC-bearing peptide shows an extended circulation time measured in days, whereas the version without the complex is cleared within roughly half an hour. This gap shapes how researchers design dosing schedules in animal models. Whether the prolonged presence of the DAC form produces effects meaningfully different from the short-acting variant remains an open question, since comparative human data are scarce.
Laboratory handling centers on minimizing exposure to water, heat and oxygen before use. Working solutions are typically prepared in sterile water or a mild buffer, and any residual particulate matter is removed by filtration. When the powder dissolves slowly, a small proportion of acetonitrile or dilute acetic acid is sometimes added as a co-solvent. Containers are kept sealed and desiccated between uses. Records of lot number, reconstitution date and storage conditions support later comparison of results across experiments.
Identity and purity are established with reversed phase high performance liquid chromatography coupled to mass spectrometry. The chromatographic step separates the target peptide from truncated sequences and deletion products, while the mass measurement confirms the expected molecular weight to within a fraction of a dalton. Because the two common variants differ by the presence of the linker, mass alone can distinguish them in the unconjugated state. Amino acid analysis and peptide mapping are used when sequence level confirmation is required.
Lyophilized material is generally stable for extended periods when held at minus twenty degrees Celsius or below and protected from moisture and light. In solution the peptide is more labile; bond hydrolysis, aggregation and oxidation of susceptible residues all proceed faster at ambient temperature. Repeated freeze and thaw cycles should be avoided because they promote clumping and loss of soluble material. The conjugated variant adds a further consideration, since the maleimide group can hydrolyze in aqueous buffer and lose its ability to react with albumin.
| Property | Value | Notes |
|---|---|---|
| Molecular weight (with DAC) | ~3647 Da | Calculated from the full amino acid sequence |
| Molecular weight (without DAC) | ~3368 Da | Mod GRF(1-29) variant |
| Appearance | White lyophilized powder | Typical form supplied for research |
| Solubility | Soluble in water | Dissolves in aqueous buffers |
| Receptor target | GHRH receptor | Expressed on pituitary somatotroph cells |
Two forms circulate in research settings and are frequently confused. One carries the drug affinity complex and is often written as CJC-1295 with DAC; the other lacks that group and is usually called modified GRF(1-29). The two share the same core sequence but differ sharply in how long they persist in blood. Products labelled only as CJC-1295 normally refer to the version carrying the complex. Documentation that omits the distinction leaves the intended molecule ambiguous.
CJC-1295 is a synthetic peptide built as a long-acting analogue of growth hormone-releasing hormone. Its backbone matches the first twenty-nine residues of the natural human hormone, with four amino acid substitutions added to slow enzymatic breakdown. A reactive maleimide group, commonly termed the drug affinity complex, allows the peptide to attach to circulating albumin after administration. That albumin attachment keeps the molecule in the bloodstream for an extended period instead of being cleared within minutes.
Naming in this area is inconsistent, and readers should treat product labels with care. In much of the literature and in vendor catalogs, the unqualified term refers to the albumin-binding version, while the version lacking the DAC group appears as modified GRF(1-29), mod GRF(1-29), or the same name with a without-DAC qualifier. Because one abbreviation has been applied to both materials, the only reliable way to identify a sample is to check the stated sequence and the presence of the linker.
CJC-1295 is the name used for a synthetic peptide modeled on growth hormone-releasing hormone, the hypothalamic signal that prompts the pituitary to release growth hormone. The compound was described by a Canadian drug discovery company in the mid-2000s as a long-acting research tool. Two closely related molecules share the name in practice: one carries a drug affinity complex, or DAC, group, and one does not. The distinction matters because the two behave differently in circulation.
The peptide backbone corresponds to GRF(1-29), the first 29 residues of native growth hormone-releasing hormone, which retains most of the receptor-activating activity of the full-length molecule. Four substitutions distinguish the analog from the natural sequence: D-alanine at position 2, glutamine at position 8, alanine at position 15, and leucine at position 27. These changes slow cleavage by dipeptidyl peptidase IV, the enzyme that degrades native hormone in plasma within minutes. The outcome is improved enzymatic stability combined with a still brief residence time when no additional modification is present.
The nasolabial flap can be either superiorly based or inferiorly based; of which the superiorly based flap is the more practical rhinoplastic application, because it has a more versatile arc of rotation, and the donor-site scar is inconspicuous. Depending upon how the defect lay upon the nose, the flap pedicle-base can be incorporated either solely to the nasal reconstruction, or it can be divided into a second stage procedure. The blood supply for the flap pedicle are the transverse branches of the contralateral angular artery (the facial artery terminus parallel to the nose), and by a confluence of blood vessels from the angular artery and from the supraorbital artery in the medial canthus, (the angles formed by the meeting of the upper and lower eyelids). Therefore, the incisions for harvesting the nasolabial flap do not continue superiorly beyond the medial canthal tendon. The nasolabial flap is a random flap that is emplaced with the proximal (near) portion resting upon the lateral wall of the nose, and the distal (far) portion resting upon the cheek, which contains the main angular artery, and so is perfused with retrograde arterial flow.
=== Sale to Sidney Feltenstein; Grotech subsidiary === In December 1994, Taubman sold A&W to Sidney Feltenstein, with the aim of pushing the chain's international expansion further, while still maintaining its headquarters in Livonia. At the time, there were 790 restaurants (688 in the United States and 102 abroad), with the bulk of the international locations located in Malaysia, Thailand and Japan, as well as in Mexico and the United Arab Emirates. Earlier in 1994, its hundredth international location opened at a tourist attraction in Bangkok: a crocodile farm. In January 1995, operations were taken over by Grotech Capital Partners, for a sum of $20 million, with Feltenstein as the chain's new CEO. An agreement was signed in 1996 with Walmart to provide restaurants in seven locations. The menu would add items depending on the region, with the rest being its standard fare. That year, its restaurants were renovated to feature an aesthetic referred to by Feltenstein as "contemporary nostalgia". The move mirrored that of Dairy Queen, which had also opened a test location with a similar feel. A&W also operated restaurants in Monterrey, a key city in northern Mexico. In 1997, A&W acquired Carousel Snack Bars, including its 175 units in malls. The agreement made the chain the owner of these units, while continuing to franchise restaurants.
=== Trust in the institutions === In 2019, the Pew Research Center interviewed over 2,000 Americans aged 18 and over on their views of various components of the federal government. They found that 54% of the people between the ages of 18 and 29 wanted larger government compared to 43% who preferred smaller government and fewer services. Older people were more likely to pick the second option. 2018 polls conducted by the Pew Research Center found that 70% of Americans aged 13 to 17 wanted the government to play a more active role in solving their problems. A 2022 poll by Pew showed that overall, medical experts, the military, and scientists were among the most trusted groups in the United States. But while a majority of Americans believed it was important for their country to remain a global leader in science, people aged 18 to 29 were somewhat less inclined to think so compared to older cohorts and were slightly more optimistic about the standing of U.S. science on the international stage. However, Generation Z's trust in institutions or the nation itself has been declining. Polls conducted during the early 2020s showed that only a minority of Americans aged 18–29 thought that their country was heading in the right direction or agreed that democracy was the best form of government. About two thirds did not trust their government.
Clinical data management (CDM) is a critical process in clinical research, which leads to generation of high-quality, reliable, and statistically sound data from clinical trials. Clinical data management ensures collection, integration and availability of data at appropriate quality and cost. It also supports the conduct, management and analysis of studies across the spectrum of clinical research as defined by the National Institutes of Health (NIH). The ultimate goal of CDM is to ensure that conclusions drawn from research are well supported by the data. Achieving this goal protects public health and increases confidence in marketed therapeutics.
In ambient ionization, ions are formed outside the mass spectrometer without sample preparation or separation. Ions can be formed by extraction into charged electrospray droplets, thermally desorbed and ionized by chemical ionization, or laser desorbed or ablated and post-ionized before they enter the mass spectrometer. Solid-liquid extraction based ambient ionization uses a charged spray to create a liquid film on the sample surface. Molecules on the surface are extracted into the solvent. The action of the primary droplets hitting the surface produces secondary droplets that are the source of ions for the mass spectrometer. Desorption electrospray ionization (DESI) creates charged droplets that are directed at a solid sample a few millimeters to a few centimeters away. The charged droplets pick up the sample through interaction with the surface and then form highly charged ions that can be sampled into a mass spectrometer. Plasma-based ambient ionization is based on an electrical discharge in a flowing gas that produces metastable atoms and molecules and reactive ions. Heat is often used to assist in the desorption of volatile species from the sample. Ions are formed by chemical ionization in the gas phase. A direct analysis in real time (DART) source operates by exposing the sample to a dry gas stream (typically helium or nitrogen) that contains long-lived electronically or vibronically excited neutral atoms or molecules (or "metastables"). Excited states are typically formed in the DART source by creating a glow discharge in a chamber through which the gas flows.
Sources: en.wikipedia.org
== Medical uses == Mobocertinib is indicated for adults with locally advanced or metastatic non-small cell lung cancer (NSCLC) with epidermal growth factor receptor (EGFR) exon 20 insertion mutations, as detected by an FDA-approved test, whose disease has progressed on or after platinum-based chemotherapy.
At least one organization, the Australasian Paediatric Endocrine Group, classifies the cancer risk associated with CAIS as low enough to recommend against gonadectomy, although it warns that the cancer risk is still elevated above the general population, and that ongoing cancer monitoring is essential. Some choose to perform gonadectomy if and when inguinal hernia presents. Estrogen replacement therapy is critical to minimize bone mineral density deficiencies later in life.
==== Hypoxia/anoxia intolerance ==== Most mammals and birds are intolerant to low/no oxygen conditions. For the heart, in the absence of oxygen, the first four complexes of the electron transport chain decrease in activity. This will lead to protons leaking through the inner mitochondrial membrane without complexes I, III, and IV pushing protons back through to maintain the proton gradient. There is also electron leak (an event where electrons leak out of the electron transport chain), which happens because NADH dehydrogenase within Complex I becomes damaged, which allows for the production of ROS (reactive oxygen species) during ischemia. This will lead to the reversing of Complex V, which forces protons from the matrix back into the inner membrane space, against their concentration gradient. Forcing protons against their concentration gradient requires energy, so Complex V uses up ATP as an energy source.
HMRC reverses the plan for its self-assessment helpline, announced the previous day, following criticism from the public and MPs. The Senedd approves Vaughan Gething as the next First Minister of Wales. The London Clinic, where the Princess of Wales underwent abdominal surgery, announces that "any breach" of patient confidentiality will be investigated after reports a member of staff tried to access her private records. 21 March The Bank of England leaves interest rates unchanged at 5.25%, for the fifth time in a row. A report published by the Parliamentary and Health Service Ombudsman recommends women born in the 1950s who were affected by the 2010 changes to the state pension age should receive compensation of between £1,000 and £2,900. 22 March Following media speculation about her health, it is revealed that the Princess of Wales has been diagnosed with cancer and is undergoing treatment. Wetherspoons reports an eightfold increase in pre-tax profits during the first six months of the 2023–24 financial year. 23 March – A report compiled by the Resolution Foundation indicates a rise in the number of people leaving work due to long-term health conditions, with the number of people inactive due to long-term health conditions rising from 2.1 million in 2019 to 2.8 million in October 2023, the longest sustained rise since 1994–1998 when records began. The UK is also the only country in the G7 not to return to pre-pandemic employment levels.
=== Cardiovascular system === The most serious signs and symptoms associated with Marfan syndrome involve the cardiovascular system - undue fatigue, shortness of breath, heart palpitations, racing heartbeats, or chest pain radiating to the back, shoulder, or arm. Cold arms, hands, and feet can also be linked to MFS because of inadequate circulation. A heart murmur, abnormal reading on an electrocardiogram, or symptoms of angina can indicate further investigation. The signs of regurgitation from prolapse of the mitral or aortic valves (which control the flow of blood through the heart) result from cystic medial degeneration of the valves, which is commonly associated with MFS (see mitral valve prolapse, aortic regurgitation). However, the major sign that would lead a doctor to consider an underlying condition is a dilated aorta or an aortic aneurysm. Sometimes, no heart problems are apparent until the weakening of the connective tissue (cystic medial degeneration) in the ascending aorta causes an aortic aneurysm or aortic dissection, a surgical emergency. An aortic dissection may be fatal, especially if diagnosis is delayed, and presents with pain radiating down the back, giving a tearing sensation. Even when the aortic root has been operated on previously, a person with MFS may suffer a Type B dissection in the descending aorta. This type is less likely to require surgery, but can still be fatal. Because underlying connective tissue abnormalities cause MFS, the incidence of dehiscence of prosthetic mitral valve is increased.
Sources: en.wikipedia.org
=== Subdisciplines === Chemistry is typically divided into several major sub-disciplines. There are also several main cross-disciplinary and more specialized fields of chemistry. Analytical chemistry is the analysis of material samples to gain an understanding of their chemical composition and structure. Analytical chemistry incorporates standardized experimental methods in chemistry. These methods may be used in all subdisciplines of chemistry, excluding purely theoretical chemistry.
In 2023, Xi put forward new productive forces, this refers to a new form of productive forces derived from continuous sci-tech breakthroughs and innovation that drive strategic emerging and future industries in a more intelligent information era. Under Xi, China made rapid advances in key technological areas, becoming a world leader in tech such as electric vehicles, lithium batteries and solar panels, as well as emerging as a global leader in artificial intelligence.
Novichok (Russian: Новичо́к, lit. 'newcomer, novice, newbie') is a family of nerve agents, some of which are binary chemical weapons. The agents were developed at the GosNIIOKhT state chemical research institute by the Soviet Union and Russia between 1971 and 1993. Some Novichok agents are solids at standard temperature and pressure, while others are liquids. Dispersal of solid form agents is thought possible if in ultrafine powder state. Russian scientists who developed the nerve agents claim they are the deadliest ever made, with some variants possibly five to eight times more potent than VX, and others up to ten times more potent than soman. Iran has also been associated with the production of such chemical agents. In the twenty-first century, Novichok agents came to public attention after they were used to poison opponents of the Russian government, including in the attempted assassination of Sergei Skripal in the United Kingdom which resulted in the poisonings of 5 people and the death of an unrelated civilian in Amesbury (2018), as well as the poisoning of Alexei Navalny (2020). However, the use of Novichok domestically against Russian citizens has been known since at least 1995. In November 2019, the Organisation for the Prohibition of Chemical Weapons (OPCW), which is the executive body for the Chemical Weapons Convention (CWC), added the Novichok agents to "list of controlled substances" of the CWC "in one of the first major changes to the treaty since it was agreed in the 1990s" in response to the 2018 poisonings in the UK.
=== Industrial === Historically, DNP has been used as an antiseptic and as a non-selective bioaccumulating pesticide. DNP was particularly useful as a herbicide alongside other closely related dinitrophenol herbicides like 2,4-dinitro-o-cresol (DNOC), dinoseb and dinoterb. Since 1998 DNP has been withdrawn from agricultural use. Currently, there are no actively registered pesticides containing DNP in the United States or Europe. Dinoseb is used industrially as a polymerisation inhibitor during styrene production. In 2023, the Home Office said it could not determine any legitimate industrial uses for DNP in the United Kingdom. It is a chemical intermediate in the production of sulfur dyes, wood preservatives and picric acid. A precursor to 2,4,6-trinitrotoluene (TNT), DNP has also been used to make photographic developers and explosives. DNP is classified as an explosive in the United Kingdom and the United States.
== Treatment == Once NAION happens, it was thought that there was no accepted treatment to reverse the damage. However, a recent uncontrolled retrospective large study has shown that if patients are treated with large doses of corticosteroid therapy during the early stages of NAION, in eyes with initial visual acuity of 20/70 or worse, seen within 2 weeks of onset, there was visual acuity improvement in 70% in the treated group compared to 41% in the untreated group (odds ratio of improvement: 3.39; 95% CI:1.62, 7.11; p < 0.001). That study and a natural history study on NAION (Ophthalmology 2008;115: 298–305.) showed that visual acuity can improve up to 6 months and not after that. To minimize the risk of further visual loss in the fellow eye or the same eye, it is essential to reduce the risk factors. Common sense dictates trying to control the cardiovascular risk factors for many reasons, including protection from this happening to the second eye. Sudden vision loss should lead to an ophthalmological consultation. If NAION is suspected, then ideally a neuro-ophthalmologist's consultation should be obtained. A recent Cochrane Review sought to determine the extent of safety and efficacy of optic nerve decompression surgery for NAION, compared to other treatments, or no treatment. The one study included in the review found no improvements in visual acuity among patients who underwent surgery for NAION, and adverse events (pain, double vision) experienced by participants who underwent surgery.
Sources: en.wikipedia.org
The synthetic peptide keeps the receptor-binding region of GHRH but carries substitutions that resist enzymatic cleavage. In the DAC version, an added group also anchors the molecule to albumin, extending its presence in the bloodstream.
The maleimide group forms a covalent link with albumin, an abundant blood protein. This attachment slows clearance, so a single administration persists much longer than the unmodified peptide. The feature is the main reason the two variants are handled differently in study design.
It is not an approved therapeutic product in major regulatory jurisdictions. It appears in research chemical catalogs and scientific literature rather than pharmacy shelves. Clinical development was limited and did not reach approval.
The mass difference from the linker is large enough for routine detection by mass spectrometry. The unconjugated form gives a single sharp signal at its expected weight. Material that has already reacted with albumin shows a much higher mass and a broadened chromatographic peak.