The short version of mass spectrometry fits in a sentence. The long version — which is the one that helps — is below.
Reviewed 2025-07-23. Anything still debated is marked as such rather than presented as settled.
The core sequence keeps the receptor-binding region of GHRH while replacing four positions that are vulnerable to dipeptidyl peptidase-4 and other proteases. Substitutions at positions 2, 8, 15, and 27 raise metabolic stability relative to the natural hormone. The N-terminal residues remain essential for activity, so changes there generally lower potency. Molecular weight sits near 3368 daltons for the tetrasubstituted analog without the linker, while the albumin-binding form is heavier because of the added maleimide group.
CJC-1295 is a synthetic peptide modeled on growth hormone-releasing hormone, the hypothalamic signal that prompts the pituitary to release growth hormone. Its sequence corresponds to the first twenty-nine residues of human GHRH, with four substitutions that slow enzymatic breakdown. Early descriptions placed the compound in research on growth hormone deficiency and related conditions, and later literature groups it with the long-acting GHRH analogs. The name appears in both laboratory and popular fitness writing, where it sometimes labels chemically different peptides.
Binding to GHRH receptors on pituitary somatotroph cells triggers cyclic AMP signaling and stimulates growth hormone synthesis and release. Because the peptide acts upstream of the pituitary, effects are mediated through endogenous growth hormone rather than direct receptor activation in peripheral tissues. Increases in insulin-like growth factor 1 are generally described as a downstream consequence. Most published human exposure data come from small early-stage studies, and the clinical significance of the pharmacokinetic profile remains incompletely characterized.
CJC-1295 is a synthetic analogue of growth hormone-releasing hormone, built on the 29-amino-acid GHRH(1-29) fragment. Four substitutions distinguish it from the natural sequence: D-alanine at position 2, glutamine at position 8, alanine at position 15, and leucine at position 27. These changes reduce enzymatic cleavage and extend the peptide's persistence in circulation. The compound is discussed in two forms, one carrying a drug affinity complex and one without it.
| Property | Value | Notes |
|---|---|---|
| Class | Synthetic peptide | GHRH receptor agonist |
| Sequence length | 29 amino acids | Derived from human GHRH |
| Molecular weight | About 3368 Da without linker | Albumin-binding form is heavier |
| Appearance | White to off-white lyophilized powder | Common form for research reference material |
| Typical storage | -20 °C or below, desiccated | Protect powder from light and moisture |
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.
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.
Once in circulation, the peptide binds the growth hormone-releasing hormone receptor displayed on pituitary somatotroph cells. Receptor activation couples to Gs proteins, elevates intracellular cyclic AMP, and drives protein kinase A signaling inside the cell. That cascade increases discharge of growth hormone into the bloodstream. The analog therefore operates through a receptor pathway that already exists for the body's own releasing hormone, rather than through an engineered artificial target.
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.
=== Fish similar in appearance === Northern snakeheads (Channa argus) are commonly mistaken for bowfin because of similarities in appearance, most noticeably their elongated, cylindrical shape and long dorsal fin that runs along their backs. Northern snakeheads are piscivorous fish native to the rivers and estuaries of China, Russia, and Korea that have been introduced and become established in parts of North America. Unlike bowfin, which are native to North America, though, the northern snakehead is considered an invasive species and environmentally harmful there. Some contrasting differences in bowfin include a black eyespot on their caudal peduncle, a tan and olive coloration, a shorter anal fin, a more rounded head, pelvic fins at a greater distance from the pectoral fins than in the northern snakehead, and the presence of the gular plate on the ventral side of the lower jaw. Another noticeable difference is that bowfin scales do not continue uniformly from their body to their head. Bowfin heads are smooth and free of scales, whereas the northern snakehead has scales that uniformly continue from its body through to its head. The burbot (Lota lota), a predatory fish native to streams and lakes of North America and Eurasia, is also commonly mistaken for bowfin. Burbots can be distinguished by their flat head and chin barbel, long anal fin, and pelvic fins situated beneath the pectoral fins.
Unlike classes I and II, Class III molecules have physiological roles and are encoded between classes I and II on the short arm of human chromosome 6. Class III molecules include several secreted proteins with immune functions: components of the complement system (such as C2, C4, and B factor), cytokines (such as TNF-α, LTA, and LTB), and heat shock proteins.
Portugal has been a secular state since 1911, and it guarantees religious freedom. Although Portugal has no official religion, the Catholic Church has a history there that predates the country's formation and can be traced back to the 3rd century. According to the 2021 Census, 80.2% of the Portuguese population aged 15 and older were Catholic, while 14.1% are nonreligious. The country has small Protestant, Latter-day Saints, Muslim, Hindu, Sikh, Jehovah's Witnesses, Baháʼí, Buddhist, and Jewish communities. Influences from Chinese traditional religion are also evident among many people, particularly in fields related to Traditional Chinese Medicine. Even though Portugal has deep ties with Christianity, as of 2019 the majority of its people were shown to be tolerant towards followers of other faiths, with the Muslim community perceiving itself as thoroughly integrated into Portugal and believing that the country provided conditions conducive to smooth integration.
The cattle boats were examined, but the dates of the murders did not coincide with a single boat's movements, and the transfer of a crewman between boats was also ruled out. At the end of October, Robert Anderson asked police surgeon Thomas Bond to give his opinion on the extent of the murderer's surgical skill and knowledge. The opinion offered by Bond on the character of the "Whitechapel murderer" is the earliest surviving offender profile. Bond's assessment was based on his own examination of the most extensively mutilated victim and the post mortem notes from the four previous canonical murders. In his opinion the killer must have been a man of solitary habits, subject to "periodical attacks of homicidal and erotic mania", with the character of the mutilations possibly indicating "satyriasis". Bond also stated that "the homicidal impulse may have developed from a revengeful or brooding condition of the mind, or that religious mania may have been the original disease but I do not think either hypothesis is likely".
== Medical uses == Protriptyline is used primarily to treat depression and to treat the combination of symptoms of anxiety and depression. Like most antidepressants of this chemical and pharmacological class, protriptyline has also been used in limited numbers of patients to treat panic disorder, obsessive-compulsive disorder, attention-deficit/hyperactivity disorder, enuresis, eating disorders such as bulimia nervosa, cocaine dependency, and the depressive phase of bipolar disorder (manic-depressive) disorder. It has also been used to support smoking cessation programs. Protriptyline is available as 5 mg and 10 mg tablets. Doses range from 15 to 40 mg per day and can be taken in one daily dose or divided into up to four doses daily. Some people with severe depression may require up to 60 mg per day. In adolescents and people over age 60, therapy should be initiated at a dose of 5 mg three times a day and increased under the supervision of a physician as needed. Patients over age 60 who are taking daily doses of 20 mg or more should be closely monitored for side effects such as rapid heart rate and urinary retention. Like all TCAs, protriptyline should be used cautiously and with close physician supervision. This is especially so for persons with glaucoma, especially angle-closure glaucoma (the most severe form) or urinary retention, for men with benign prostatic hyperplasia (enlarged prostate gland), and for the elderly.
Sources: en.wikipedia.org
The Analytical Information Markup Language (AnIML) is an open ASTM XML standard for storing and sharing analytical chemistry and biological data. A main reason of using AnIML is that FAIR data (Findable, Accessible, Interoperable and Reusable) standards are automatically implemented. As AnIML's structure is human-readable, Accessibility is given. Interoperability, Reusability and Findability are secured by the AnIML Core and AnIML Technique Definitions. AnIML has been continuously worked on starting from 2003 up to 2020. The last AnIML Core Version update happened in 2010. So far, no standardisation document nor public example files have been published. The standard exists only in pre-release form. AnIML is a XML standard which consists of two logical layers:
== Summary table for numbers of each class of nuclides == This is a summary table from List of nuclides. Numbers are not exact and may change slightly in the future, as nuclides are observed to be radioactive, or new half-lives are determined to some precision.
Researchers are actively working to improve the power density, safety, cycle durability (battery life), recharge time, cost, flexibility, and other characteristics, as well as research methods and uses, of these batteries. Solid-state batteries are being researched as a breakthrough in technological barriers. Currently, solid-state batteries are expected to be the most promising next-generation battery, and various companies are working to popularize them. Research areas for lithium-ion batteries include extending lifetime, increasing energy density, improving safety, reducing cost, and increasing charging speed, among others. Research has been under way in the area of non-flammable electrolytes as a pathway to increased safety based on the flammability and volatility of the organic solvents used in the typical electrolyte. Strategies include aqueous lithium-ion batteries, ceramic solid electrolytes, polymer electrolytes, ionic liquids, and heavily fluorinated systems. One of the ways to improve batteries is to combine the various cathode materials. This allows researchers to improve on the qualities of a material, while limiting the negatives. One possibility is coating lithium nickel manganese oxide with lithium iron phosphate through resonant acoustic mixing. The resulting material benefits from an increase electrochemical performance and improved capacity retention. Similar work was done with iron (III) phosphate.
The Rhodesians of the Cape Town Highlanders patrolled nightly around the village of Casigno for the next three months. Some of the tank crews, including the Rhodesians of the Special Service Battalion, were temporarily reassigned to infantry duties to assist in these patrols. Many of the Rhodesians had never seen snow before, but on the whole they adapted well, taking up winter sports such as skiing during time off duty. The Rhodesians of the Special Service Battalion received new, more heavily armed tanks in November–December 1944. In February 1945 the 6th Division was relieved by the American 1st Armoured Division and moved to Lucca, 15 kilometres (9.3 mi) north of Pisa, for rest and reorganisation. The Rhodesian Anti-Tank Battery was refitted with M10 tank destroyers. The Spitfires of No. 237 Squadron, meanwhile, took part in assaults on German transport in the Po Valley around Parma and Modena.
=== Chronic pain === Chronic pain continues to be regarded as the core characteristic of fibromyalgia. According to the NHS, widespread pain is a major symptom, which could feel like an ache, a burning sensation, or a sharp, stabbing pain. Patients are also susceptible to pain, and the slightest touch can cause pain. Pain also tends to linger for a longer period when a patient experiences it. The pain associated with fibromyalgia is often a constant dull ache that has lasted for at least three months, occurring on both sides of the body and above and below the waist. Pain in fibromyalgia may include contributions from central pain, peripheral musculoskeletal pain generators, neuropathic pain, and other pathways. Men may be affected by FM pain differently to women.
Sources: en.wikipedia.org
The buffer liquid between the two tubes is at a gradually rising concentration, always a bit over the incoming fluid, in this example reaching 1200 mg/L. This is regulated by the pumping action on the returning tube as will be explained immediately. The tip of the loop has the highest concentration of salt (NaCl) in the incoming tube—in the example 1199 mg/L, and in the buffer 1200 mg/L. The returning tube has active transport pumps, pumping salt out to the buffer liquid at a low difference of concentrations of up to 200 mg/L more than in the tube. Thus when opposite the 1000 mg/L in the buffer liquid, the concentration in the tube is 800 and only 200 mg/L are needed to be pumped out. But the same is true anywhere along the line, so that at exit of the loop also only 200 mg/L need to be pumped. In effect, this can be seen as a gradually multiplying effect—hence the name of the phenomena: a 'countercurrent multiplier' or the mechanism: Countercurrent multiplication, but in current engineering terms, countercurrent multiplication is any process where only slight pumping is needed, due to the constant small difference of concentration or heat along the process, gradually raising to its maximum. There is no need for a buffer liquid, if the desired effect is receiving a high concentration at the output pipe.
Securities and Exchange Commission prosecutor and Republican candidate for New York's 1st congressional district Robert Karem (2000), assistant secretary of defense for international security affairs and former acting under secretary of defense for policy David Segal (2001), member of the Rhode Island House of Representatives Robby Mook (2002), political campaign strategist and campaign manager for Virginia governor Terry McAuliffe, former executive director of Democratic Congressional Campaign Committee; campaign manager for Hillary Clinton presidential campaign, 2016 Sam Arora (2003), member of the Maryland House of Delegates 2011–2015 Cyrus Habib (2003), lieutenant governor of Washington, first and only Iranian American elected to a state office in the U.S. Adam Jentleson (2003), former deputy chief of staff to Harry Reid and columnist of GQ Nikil Saval (2005), former editor of N+1, member of the Pennsylvania State Senate Josie Raymond (2007), member of the Kentucky House of Representatives from the 31st district Ruthzee Louijeune (2008), president of the Boston City Council Sara Jacobs (2011), member of the United States House of Representatives for California's 53rd congressional district, granddaughter of Qualcomm founder Irwin M.
An antibody elution is a clinical laboratory diagnostic procedure which removes sensitized antibodies from red blood cells, in order to determine the blood group system antigen the antibody targets. An antibody elution is deemed necessary when antibodies of the immunoglobulin class G (IgG) are found sensitized (bound) to peripheral red cells collected from a blood product transfusion recipient. IgG antibodies are detected using an assay known as the direct antiglobulin test. Antibody elutions are specialized tests used in clinical blood banks. Examples of routine tests include ABO/Rh, antibody screen, antibody identification, and antiglobulin testing. Examples of other specialized tests used in blood banking include: treatment with thiol reagent, monocyte monolayer assay, enzyme treatment, and adsorptions. This procedure aids in the investigation of antibodies that are difficult to identify, distinguishing transfusion reactions, hemolytic disease of the fetus and newborn, and warm autoantibody workups.
== Awareness == The Substance Abuse and Mental Health Services Administration hosts an annual health observance known as National Prevention Week. Every third week of May, they encourage communities across the country to unite to share stories about positive mental and behavioral health and the importance of implementing prevention methods. They also sponsor Recovery Month every September. Recovery Month aims to raise awareness about mental and substance use disorders and to honor individuals who recover, promoting the positive message that prevention works and that treatment is effective. International Overdose Awareness Day is on 31 August to remember those who have died from an overdose, to decrease the stigma of drug-related deaths, and to promote the prevention of overdose.
CEEs are a combination of estrogens, or agonists of the estrogen receptors. The major estrogen in CEEs, sodium estrone sulfate, itself is inactive, and rather serves as a prodrug of estrone and then of estradiol. The transformation of estrone sulfate to estrone is catalyzed by steroid sulfatase, and of estrone into estradiol by 17β-hydroxysteroid dehydrogenase. CEEs (as Premarin) and estrone have been found to be equivalent in potency in an animal model of estrogenic activity. On the other hand, the active forms of the equine estrogens in CEEs, such as equilin and 17β-dihydroequilin, have greater potency in the liver relative to bioidentical estradiol, similarly to synthetic estrogens like ethinylestradiol and diethylstilbestrol. This results in disproportionate effects on liver protein production compared to estradiol, although to a lesser extent than ethinylestradiol and diethylstilbestrol. In addition, 17β-dihydroequilenin has shown a selective estrogen receptor modulator (SERM)-like profile of estrogenic activity in studies with monkeys, in which beneficial effects on bone and the cardiovascular system were observed but proliferative responses in breast or endometrium were not seen, although the clinical significance of this is unknown. CEEs consists of the sodium salts of the sulfate esters of equine estrogens in a specific and consistent composition (see the table). The major estrogens in CEEs are sodium estrone sulfate and sodium equilin sulfate, which together account for approximately 71.5–92.0% of the total content of CEEs.
Sources: en.wikipedia.org
Natural GHRH is degraded quickly by dipeptidyl peptidase-4 and related enzymes, giving it a half-life measured in minutes. CJC-1295 carries substitutions that slow that breakdown, so it stays intact longer. Both act at the same pituitary receptor and produce the same class of signal.
The label was first attached to the albumin-binding form during early development work. A shorter analog without the linker later became known by the same name in informal use. Published papers normally state which version was studied, so the methods section resolves the ambiguity.
It is a synthetic peptide rather than a steroid, and it does not occur naturally in the body. Its sequence is derived from a hypothalamic hormone called growth hormone-releasing hormone. It works as a receptor agonist rather than as a replacement for that hormone.
The two share the same 29-amino-acid backbone. CJC-1295 carries an additional albumin-binding moiety that markedly extends its residence time in circulation, while the form without that moiety clears faster. Literature sometimes applies the name loosely to either variant.