Everything below concerns GRF(1-29). We keep the language plain, cite what the science says, and separate well-supported claims from open questions.
Updated 2026-04-10. Numbers and descriptions here follow the published literature rather than marketing material.
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.
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.
Four amino acid substitutions separate the modified backbone from the parent GRF(1-29) sequence. These changes reduce recognition by dipeptidyl peptidase IV and related proteases, extending the interval before degradation. Development work in this area sought longer-acting GHRH analogs for endocrine investigation. Published descriptions treat the substitution set as a defining property of the core sequence, while the albumin-binding linker is described separately as an optional addition to that same backbone.
CJC-1295 is a synthetic peptide analog of growth hormone-releasing hormone, constructed on the 29-amino-acid fragment designated GRF(1-29). The name began as an internal development code during the 1990s and later spread through research supply catalogs and discussion forums. The molecule does not occur in nature; its sequence is engineered rather than isolated from tissue. Two related compounds are sold under this single label, and they differ by one appended chemical group that strongly influences how long the peptide remains in circulation.
The dividing feature between the two forms is a maleimide-based drug affinity complex, abbreviated DAC. In the DAC-bearing version, a linker attaches the peptide to serum albumin after administration, and that association slows removal from plasma. The version lacking DAC appears in catalogs as MOD GRF(1-29) or tetrasubstituted GRF(1-29). Because informal writing treats both as one item, comparisons drawn from such sources routinely blend measurements taken from two molecules with substantially different behavior.
| Property | Value | Notes |
|---|---|---|
| Molecular class | Synthetic peptide | GHRH analog, not a steroid |
| Backbone length | 29 amino acids | Based on GRF(1-29) |
| Substitutions | Four positions | D-Ala2, Gln8, Ala15, Leu27 |
| Appearance | White to off-white powder | Typical lyophilized research material |
| Common synonyms | Modified GRF(1-29) | Usage varies between sources |
Purity is most often assessed by reversed-phase high-performance liquid chromatography, reported as a percentage of total peak area. Identity is confirmed by mass spectrometry, which yields a molecular ion consistent with the expected sequence. Amino acid analysis and peptide mapping provide additional characterization. Reported purity values are method-dependent, so figures from different laboratories are not always directly comparable without details of column, gradient, and detection wavelength.
Peptide degradation proceeds mainly through hydrolysis, oxidation of methionine, and deamidation of asparagine or glutamine residues. The maleimide group on the albumin-binding variant can also react with thiols or hydrolyze in aqueous media. Because these pathways accelerate with temperature and pH extremes, handling conditions strongly influence measured stability. Stability data in the public literature are limited and often generated under differing conditions, so general statements about shelf life should be read as approximate.
Stability depends heavily on physical state. A lyophilized powder kept dry, desiccated, and shielded from light typically holds its integrity for months to years at minus twenty degrees Celsius, and longer at minus eighty. Once dissolved, the peptide becomes far more vulnerable, since peptide bond hydrolysis, oxidation of susceptible residues, and aggregation all proceed faster in solution. Buffers near neutral pH are generally gentler than strongly acidic or alkaline conditions. Repeated freeze-thaw cycles and exposure to air-liquid interfaces during vigorous mixing cause losses that are easy to overlook.
Verification matters because research peptides vary widely in quality. A certificate of analysis is only as reliable as the method behind it, and a single chromatographic trace reveals little about counter-ions, residual solvents, or water content. Independent laboratories commonly pair mass confirmation with chromatographic purity and, where relevant, quantify water along with acetate or trifluoroacetate content. Reported purity figures are not standardized across suppliers, so a stated value such as ninety-eight percent is not directly comparable unless the analytical method, column, and detection wavelength accompany it.
Characterization of this peptide relies on a small set of routine techniques. Reversed-phase high-performance liquid chromatography separates the target from truncated or oxidized by-products and yields a purity estimate when paired with ultraviolet detection near 214 nanometers. Mass spectrometry, either electrospray coupled to liquid chromatography or matrix-assisted laser desorption, confirms that the observed mass matches the value calculated for the expected sequence. Amino acid analysis, and enzymatic digestion followed by fragment mapping, are used when the sequence itself rather than the mass requires verification.
A breeder reactor is a nuclear reactor that generates more fissile material than it consumes. These reactors can be fueled with more-commonly available isotopes of uranium and thorium, such as uranium-238 and thorium-232, as opposed to the rare uranium-235 which is used in conventional reactors. These materials are called fertile materials since they can be bred into fuel by these breeder reactors. Breeder reactors achieve this because their neutron economy is high enough to create more fissile fuel than they use. These extra neutrons are absorbed by the fertile material that is loaded into the reactor along with fissile fuel. This irradiated fertile material in turn transmutes into fissile material which can undergo fission reactions. Breeders were at first found attractive because they made more complete use of uranium fuel than light-water reactors, but interest declined after the 1960s as more uranium reserves were found and new methods of uranium enrichment reduced fuel costs. Breeder reactors have been developed and operated in Russia, India, Japan, the United States, France, and China, but only Russia is currently operating a commercial fast breeder reactor as of April 2026.
== Medical uses == Zapomeran is used to provide protection against COVID-19, caused by infection with the SARS-CoV-2 virus. The vaccine requires two doses, which are administered 28 days apart. It is a self-amplifying mRNA vaccine.
== Medical Significance == Pathogenic mutations in this gene have been associated with a number of diseases, including Developmental and epileptic encephalopathy 71 (DEE71), CASGID syndrome, and Global developmental delay, progressive ataxia, and elevated glutamine (GDPAG).
in the manufacturing processes involved with an aircraft of this size, including titanium structures, chemical milling and the machining of integral panels." By the mid-1980s, PZL was planned to produce half of the Il-86, including the entire wing, and also to work on Il-86 developments (“Now we are preparing to manufacture units for the next model of the Il wide-body plane,” according to Belczak). From May 1977, the Polish factory manufactured entire empennages including tailplanes and the fin, all control surfaces, high-lift devices and engine pylons for the Il-86, representing "about 16 per cent of these aircraft." Amid labour and political unrest in Poland from 1980 onwards, the Voronezh factory was instructed to retain wing manufacture. After certification in 1980, annual Il-86 outputs were: 1980, 1; 1981, 0; 1982, 11; 1983, 12; 1984, 8; 1985, 9 (including the four for 8 ADON); 1986, 11; 1987, 10; 1988, 10; 1989, 9; 1990, 11 (including the three for export to China), 1991, 3. Of the 106 examples built, one never flew (being used for static tests) and three were exported. The five-year plan in force when the USSR ceased to exist called for 40 more aircraft to be manufactured by 1995, but the manufacturing facility closed in early 1992.
=== Carbon dioxide === Humans are the main indoor source of carbon dioxide (CO2) in most occupied buildings. Indoor CO2 concentrations can be used as an indicator of the adequacy of outdoor air ventilation relative to occupancy and metabolic activity. Exposure to elevated indoor CO2 concentrations has been investigated in relation to human health and cognitive performance. Some studies have reported physiological and psychomotor effects at relatively low concentrations, although the evidence is not consistent and it can be difficult to distinguish the effects of CO2 itself from those of other pollutants and human bioeffluents associated with inadequate ventilation. Reviews of the available evidence have reported possible effects on cognitive performance at concentrations above 1000 ppm, particularly during complex tasks, although the evidence remains subject to uncertainty. At concentrations below 5000 ppm, the health effects attributable specifically to CO2 are difficult to distinguish from those associated with other indoor pollutants and inadequate ventilation. Indoor CO2 concentrations are widely used as an indicator of ventilation performance in buildings. Because indoor concentrations are influenced by occupancy, ventilation rates, building characteristics and outdoor conditions, measurements of CO2 can provide information on the adequacy of air exchange in occupied spaces.
Sources: en.wikipedia.org
==== Sanctions ==== On 15 September, the company issued a public apology for the contaminated powdered milk; Sanlu was ordered to halt production, and to destroy all unsold and recalled products. Authorities reportedly seized 2,176 tons of powdered milk in Sanlu's warehouses. An estimated 9,000 tons of product had been recalled. Tian Wenhua, chairwoman and general manager of Sanlu and Secretary of the Sanlu Communist Party chapter was stripped of her party and functional posts during an extraordinary meeting of the Hebei provincial standing committee of the CCP; four Shijiazhuang officials, including vice mayor in charge of food and agriculture, Zhang Fawang, were reportedly removed from office. Shijiazhuang Mayor Ji Chuntang resigned on 17 September. Li Changjiang, minister in charge of the AQSIQ, was forced to resign on 22 September after the State Council inquest concluded he was responsible for the "negligence in supervision". Investigators also blamed the Shijiazhuang government. Local Party Secretary Wu Xianguo was fired on the same day.
== Further reading == Andrew H. Cutler, Metallurgical Properties of Lunar and Asteroidal Steels, 7th Princeton/AIAA/SSI Conference, 1985. David Gump, Space Enterprise: Beyond NASA, Praeger Publishers, 1990, ISBN 0-275-93314-8. T. A. Heppenheimer, Colonies in Space, 1977, Stackpole Books, ISBN 0-8117-0397-5. Lewis, J., Matthews, M.S., and Guerrieri, M.L., Editors, 1993, Resources of Near-Earth Space, University of Arizona Press, 1993. ISBN 978-0-8165-1404-5. Wahl, Bruno W. (1968). Analysis of Selected Opportunities for Manufacturing in Space. McDonald Douglas Astronautics Company.
=== Historiography === Anderson, Margaret Lavinia. "Confessions of a Fellow Traveler," Catholic Historical Review (2013) 99#4 pp 623–648. Drury, Marjule Anne. "Anti-Catholicism in Germany, Britain, and the United States: A review and critique of recent scholarship." Church History 70.1 (2001): 98-131 online Zeender, John K. "Recent Literature on the German Center Party," Catholic Historical Review (1984) 70#3 pp 428–441. in JSTOR
Mining of an active deep sea hydrothermal vent ecosystem would depend on the recolonization of chemosynthetic bacteria, and therefore the continuation of the hydrothermal vent fluid as it is the main hydrothermal energy source. It is very difficult to get an idea of the effects of mining on the hydrothermal vent fluid because there have been no large scale studies done. However, there have been studies on the recolonization of these vent ecosystems after volcanic destruction. From these we can develop insight on the potential effects of mining destruction, and have learned it took 3–5 years for bacteria to recolonize the area, and around 10 years for megafauna to return. It was also found that there was a shift in the composition of species in the ecosystem compared to before the destruction, and the presence of immigrant species. This shift in biodiversity poses issues to certain critically endangered species that thrive in harsh deep sea environment, like mollusks. Though further research into the effects of sustained seafloor SMS mining on species recolonization is needed. Shallow hydrothermal vents have also been proposed as a potential model for climate change in extreme environments, specifically by tracking changes to highly specialized organisms local to the vent. Major impacts of climate change such as ocean acidification, increasing temperature and heavy metal deposition, on local hydrothermal vent ecosystems are areas of interest for these models. Deep sea mining's impact on efficacy of these models is an area of future interest.
== History == Russell Investments' indices began in 1984 when the firm launched its family of U.S. indices to measure U.S. market segments and hence better track the performance of investment managers. The resulting methodology produced the broad-market Russell 3000 Index and sub-components such as the small-cap Russell 2000 Index. Using a rules-based and transparent process, Russell forms its indexes by listing all companies in descending order by market capitalization adjusted for float, which is the actual number of shares available for trading. In the United States, the top 3,000 stocks (those of the 3,000 largest companies) make up the broad-market Russell 3000 Index. The top 1,000 of those companies make up the large-cap Russell 1000 Index, and the bottom 2,000 (the smallest companies) make up the small-cap Russell 2000 Index. In 2014, London Stock Exchange Group (LSEG) acquired Russell Investments for $2.7 billion. LSEG separated Russell Indexes from the rest of Russell Investments, and later sold Russell Investments in 2020. In 2015, LSEG announced the FTSE Russell brand for its indexing business.
Sources: en.wikipedia.org
Korea is believed to be the first country in Asia that acupuncture spread to outside of China. Within Korea there is a legend that acupuncture was developed by emperor Dangun, though it is more likely to have been brought into Korea from a Chinese colonial prefecture in 514 AD. Acupuncture use was commonplace in Korea by the 6th century. It spread to Vietnam in the 8th and 9th centuries. As Vietnam began trading with Japan and China around the 9th century, it was influenced by their acupuncture practices as well. China and Korea sent "medical missionaries" that spread traditional Chinese medicine to Japan, starting around 219 AD. In 553, several Korean and Chinese citizens were appointed to re-organize medical education in Japan and they incorporated acupuncture as part of that system. Japan later sent students back to China and established acupuncture as one of five divisions of the Chinese State Medical Administration System. Acupuncture began to spread to Europe in the second half of the 17th century. Around this time, Willem ten Rhijne, a physician working for the Dutch East India Company, met Japanese acupuncture practitioners and later encouraged Europeans to further investigate it. He published the first in-depth description of acupuncture for the European audience and created the term "acupuncture" in his 1683 work De Acupunctura. France was an early adopter among the West due to the influence of Jesuit missionaries, who brought the practice to French clinics in the 16th century.
== Amino acids selective pressure == It has been shown that putting an amino acid bio-synthesizing gene like HIS4 gene under amino acid selective pressure in yeast causes enhancement of expression of adjacent genes which is due to the transcriptional co-regulation of two adjacent genes in Eukaryota.
=== Other uses in science and technology === Gene-specific tag (also referred to as SNP) General set theory General strain theory, in sociology General systems theory Generalized structure tensor Global surface temperature Glutathione S-transferase, an enzyme family Goode Solar Telescope, in California
The flowers may be arranged along the stem, developing from the base, as a single flower at the tip of the stem, or as a cluster of flowers. They contain both male (androecium) and female (gynoecium) characteristics and are symmetric radially, but sometimes as a mirror image. Most flowers are large and colourful, except for Medeoleae. Both the petals and sepals are usually similar and appear as two concentric groups (whorls) of 'petals', that are often striped or multicoloured, and produce nectar at their bases. The stamens are usually in two groups of three (trimerous) and the pollen has a single groove (monosulcate). The ovary is located above the attachment of the other parts (superior). There are three fused carpels (syncarpus) with one to three chambers (locules), a single style and a three-lobed stigma. The embryo sac is of the Fritillaria type. Usually indeterminate (lacking terminal flower) as a raceme (Lilium); sometimes reduced to a single terminal flower (Tulipa). When pluriflor (multiple blooms), the flowers are arranged in a cluster or rarely are subumbellate (Gagea) or a thyrse (spike). The flowers are hermaphroditic, actinomorphic (radially symmetric) or slightly zygomorphic (bilaterally symmetric), pedicellate (on a short secondary stem), generally large and showy but may be inconspicuous (Medeoleae). The bracts may (bracteate) or may not (ebracteate) be present.
Sources: en.wikipedia.org
No. It is a laboratory-made analog of growth hormone-releasing hormone. The natural hormone is a 44-residue peptide, while the analog is built on a shorter 29-residue fragment.
The original material included a linker that binds serum albumin. A later variant removed that linker to reduce the duration of action. Catalogs and papers did not consistently adopt separate names, so both remain widely labeled with the same term.
The amino acid sequence and the presence or absence of the linker group. Mass measured by spectrometry gives an independent check that separates the two forms.
No. It is a laboratory-synthesized analog built on a fragment of the natural hormone. The natural peptide is shorter-lived and lacks the stabilizing substitutions found in the synthetic version.