If you have been reading about lyophilisation and want a single page that covers the useful parts, this is it: definitions, context, how it is studied, and the questions that come up repeatedly.
Last reviewed on 2025-12-22. Where a claim depends on a specific study, the study is described rather than over-claimed.
Two related forms appear under the CJC-1295 name. The simpler analogue, commonly written as modified GRF(1-29), carries the four substitutions but no additional conjugation. The second form attaches a maleimidopropionic acid linker to a lysine residue, a modification frequently called the drug affinity complex. That linker reacts with the free thiol on serum albumin to form a covalent bond. Because albumin has a long residence time in blood, the conjugated peptide stays in circulation far longer than the unconjugated analogue.
Receptor level activity follows the canonical GHRH pathway. The peptide binds the GHRH receptor, a class B G protein coupled receptor on somatotroph cells of the anterior pituitary. Binding raises intracellular cyclic AMP, which promotes calcium entry and the release of growth hormone into the bloodstream. Because the molecule acts at the same receptor as the endogenous hormone, its effect is superimposed on the natural pulsatile rhythm rather than replacing it. Whether sustained receptor occupation leads to desensitization is not fully settled.
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.
CJC-1295 is a synthetic peptide designed to mimic growth hormone-releasing hormone (GHRH), the endogenous signal that prompts the pituitary gland to release growth hormone. The compound is a modified fragment of the natural hormone, spanning the first twenty-nine amino acids of GHRH with several substitutions that slow enzymatic breakdown. Two variants circulate in research settings: one carrying a drug affinity complex (DAC) and one without it. The DAC-free form is frequently labelled Mod GRF(1-29) in catalogs and discussion forums.
| Property | Value | Notes |
|---|---|---|
| Peptide class | Synthetic GHRH analogue | Built on a 29 residue sequence |
| Primary target | GHRH receptor (GHRHR) | Class B G protein coupled receptor |
| Unconjugated half life | Minutes | Limited by protease degradation |
| Key modification | Four residue substitutions | Positions 2, 8, 15 and 27 |
| Common synonym | Modified GRF(1-29) | Usually denotes the form without DAC |
Identity and purity are assessed mainly by reversed-phase high-performance liquid chromatography combined with mass spectrometry. The chromatographic separation resolves the target peptide from truncation products and from species carrying oxidised residues, while mass measurement confirms the expected molecular mass. Because the two common variants differ by roughly 280 daltons, a mass determination distinguishes them unambiguously. Purity is often quoted as a percentage of total peak area, although that figure depends on the detection wavelength and the integration method applied.
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.
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.
== Further reading == Theravada Walpola Rahula (1974), What the Buddha Taught P. A. Payutto, Dependent Origination: The Buddhist Law of Conditionality (translation for the fourth chapter of P. A. Payutto's Buddhadhamma) Ajahn Sucitto (2010). Turning the Wheel of Truth: Commentary on the Buddha's First Teaching. Shambhala. (pages 61–76) Jackson, Peter A. (2003), Buddhadasa. Theravada Buddhism and Modernist reform in Thailand, Silkworm Books Ajahn Amaro (2021), Catastrophe/Apostrophe: The Buddha's Teachings on Dependent Origination/Cessation, Amaravati Publications Tibetan Buddhism Chogyam Trungpa (1972). "Karma and Rebirth: The Twelve Nidanas, by Chogyam Trungpa Rinpoche." Karma and the Twelve Nidanas, A Sourcebook for the Shambhala School of Buddhist Studies. Vajradhatu Publications. Dalai Lama (1992). The Meaning of Life, translated and edited by Jeffrey Hopkins, Boston: Wisdom. Geshe Sonam Rinchen (2006). How Karma Works: The Twelve Links of Dependent Arising. Snow Lion Khandro Rinpoche (2003). This Precious Life. Shambala Thrangu Rinpoche (2001). The Twelve Links of Interdependent Origination. Nama Buddha Publications. Scholarly Frauwallner, Erich (1973), "Chapter 5. The Buddha and the Jina", History of Indian Philosophy: The philosophy of the Veda and of the epic. The Buddha and the Jina. The Sāmkhya and the classical Yoga-system, Motilal Banarsidass Bucknell, Roderick S.
Although the most important members of each family are tabulated here, some species may express additional chaperones, co-chaperones, and heat shock proteins not listed. In addition, many of these proteins may have multiple splice variants (Hsp90α and Hsp90β, for instance) or conflicts of nomenclature (Hsp72 is sometimes called Hsp70).
== Personal life == Kiggans is a lifelong Roman Catholic. She has been married since 1999 to Steve Kiggans, a retired Navy F-18 pilot. They have four children. Kiggans' father is also a veteran, serving in the Vietnam War as an Army Green Beret.
The first history of Christian Science appeared in McClure's magazine in 14 installments from January 1907 to June 1908, preceded by an editorial in December 1906. The essence of the articles, which included court documents and affidavits from Eddy's associates, was that Eddy's chief concern was money, and that she had derived Christian Science from Quimby. The material was also published as a book, The Life of Mary Baker G. Eddy and the History of Christian Science (1909). It became the key source for most non-church histories of the religion. The editor-in-chief assigned five writers to work on the series, including the novelist Willa Cather as the principal author. The book was kept out of print from early in its life by the Christian Science church, which bought the original manuscript. It was republished in 1971 by Baker Book House when its copyright expired, and again in 1993 by the University of Nebraska Press.
Becky's absence is written as her dropping out of high school to elope with Mark and moving to Minneapolis. Producers, however, wanted the character to return but, with Goranson unavailable, they recast the role with Canadian actress Sarah Chalke. Chalke appeared as Becky starting mid-Season 6 and all of Season 7. Goranson returned as Becky for Season 8. When Goranson's school schedule occasionally conflicted with her filming schedule, Chalke filled in. Goranson, not wanting to put the show through more scheduling conflicts, declined to sign on for Season 9 so Chalke returned full time. In the series revival, Goranson once again played Becky. In Season 10, Goranson, as Becky, and Chalke, as a character named Andrea, meet and comment on how much they resemble one another. The Andrea character hires Becky to be her surrogate; this arrangement fails due to Becky's age (she is 43) making it unlikely she can conceive. In Season 1 of The Conners, which deals with life after Roseanne's death from an accidental opiate overdose, Becky, who never expected to get pregnant, announces she is expecting. The child's father, Becky's restaurant coworker Emilio, is an undocumented immigrant from Mexico and unable to help out financially, as he is a small-wage earner. With her family's support, Becky proceeds with the pregnancy. Becky likes but does not love Emilio, though she later warms to him and accepts his being part of her and her child's lives; Dan hires him as a drywall worker at his construction business, and Jackie tutors him in English.
Sources: en.wikipedia.org
=== Pharmacodynamics === Cyclofenil is a SERM, or a mixed agonist and antagonist of the estrogen receptors (ERs). It is described as a relatively weak/mild SERM. The medication is generally less effective than other SERMs. The medication is an "impeded estrogen" and is thought to work as a progonadotropin by blocking the actions of estrogens in the pituitary gland and hypothalamus, thereby disinhibiting release of the gonadotropins luteinizing hormone and follicle-stimulating hormone. In men, cyclofenil can increase testosterone levels due its progonadotropic effects.
=== Hydrides, carbides and nitrides === Uranium metal heated to 250 to 300 °C (482 to 572 °F) reacts with hydrogen to form uranium hydride. Even higher temperatures will reversibly remove the hydrogen. This property makes uranium hydrides convenient starting materials to create reactive uranium powder along with various uranium carbide, nitride, and halide compounds. Two crystal modifications of uranium hydride exist: an α form that is obtained at low temperatures and a β form that is created when the formation temperature is above 250 °C. Uranium carbides and uranium nitrides are both relatively inert semimetallic compounds that are minimally soluble in acids, react with water, and can ignite in air to form U3O8. Carbides of uranium include uranium monocarbide (UC), uranium dicarbide (UC2), and diuranium tricarbide (U2C3). Both UC and UC2 are formed by adding carbon to molten uranium or by exposing the metal to carbon monoxide at high temperatures. Stable below 1800 °C, U2C3 is prepared by subjecting a heated mixture of UC and UC2 to mechanical stress. Uranium nitrides obtained by direct exposure of the metal to nitrogen include uranium mononitride (UN), uranium dinitride (UN2), and diuranium trinitride (U2N3).
=== Designed nucleic acid systems === Scientists can encode digital information onto a single strand of synthetic DNA. In 2012, George M. Church encoded one of his books about synthetic biology in DNA. The 5.3 Mb of data was more than 1000 times greater than the previous largest amount of information to be stored in synthesized DNA. A similar project encoded the complete sonnets of William Shakespeare in DNA. More generally, algorithms such as NUPACK, ViennaRNA, Ribosome Binding Site Calculator, Cello, and Non-Repetitive Parts Calculator enables the design of new genetic systems. Many technologies have been developed for incorporating unnatural nucleotides and amino acids into nucleic acids and proteins, both in vitro and in vivo. For example, in May 2014, researchers announced that they had successfully introduced two new artificial nucleotides into bacterial DNA. By including individual artificial nucleotides in the culture media, they were able to exchange the bacteria 24 times; they did not generate mRNA or proteins able to use the artificial nucleotides.
Secondary amino acids, amino acids containing a secondary amine group are sometimes named imino acids, though this usage is obsolescent. The only proteinogenic amino acid of this type is proline, although the related non-proteinogenic amino acids hydroxyproline and pipecolic acid have often been included in studies of this class of compounds. The term imino acid is also the obsolete term for imidic acids, structures containing the -C(=NH)-OH group, and should not be used for them.
Sources: en.wikipedia.org
Relaxin is a protein hormone of about 6000 Da, first described in 1926 by Frederick Hisaw. The relaxin family peptide hormones belong to the insulin superfamily and consists of seven peptides of high structural but low sequence similarity; relaxin-1 (RLN1), 2 (RLN2) and 3 (RLN3), and the insulin-like (INSL) peptides, INSL3, INSL4, INSL5 and INSL6. The functions of relaxin-3, INSL4, INSL5, and INSL6 remain uncharacterised.
In May 2012, the ONDCP published "Principles of Modern Drug Policy", broadly focusing on public health, human rights, and criminal justice reform, while targeting drug traffickers. According to ONDCP director Kerlikowske, drug legalization is not the "silver bullet" solution to drug control, and success is not measured by the number of arrests made or prisons built. That month, a joint statement, "For a humane and balanced drug policy", was signed by Italy, Russia, Sweden, the United Kingdom and the US, promoting a combination of "enforcement to restrict the supply of drugs, with efforts to reduce demand and build recovery." Meanwhile, at the state level, 2012 saw Colorado and Washington become the first two states to legalize the recreational use of cannabis with the passage of Amendment 64 and Initiative 502 respectively. A 2013 ACLU report declared the anti-marijuana crusade a "war on people of color". The report found that "African Americans [were] 3.73 times more likely than whites to be apprehended despite nearly identical usage rates, and marijuana violations accounting for more than half of drug arrests nationwide during the previous decade". Under Obama's policies, nonwhite drug offenders received less excessive criminal sanctions, but by examining criminals as strictly violent or nonviolent, mass incarceration persisted.
The Journal of Mass Spectrometry is a peer-reviewed scientific journal covering all aspects of mass spectrometry including instrument design and development, ionization processes, mechanisms and energetics of gaseous ion reactions, spectroscopy of gaseous ions, theoretical aspects, ion structure, analysis of compounds of biological interest, methodology development, applications to elemental analysis and inorganic chemistry, computer-related applications and developments, and environmental chemistry and other fields that use innovative aspects of mass spectrometry. It was established in 1968 as Organic Mass Spectrometry by Heyden & Son and obtained its current title in 1995. It is currently published by John Wiley & Sons. According to the Journal Citation Reports, the journal has a 2020 impact factor of 1.982.
Clandestine atomic spies from the Soviet Union, who infiltrated the Manhattan Project during WWII, played a major role in increasing tensions that led to the Cold War. In addition to usual espionage, the Western agencies paid special attention to debriefing Eastern Bloc defectors. Edward Jay Epstein describes that the CIA understood that the KGB used "provocations", or fake defections, as a trick to embarrass Western intelligence and establish Soviet double agents. As a result, from 1959 to 1973, the CIA required that East Bloc defectors went through a counterintelligence investigation before being recruited as a source of intelligence. During the late 1970s and 1980s, the KGB perfected its use of espionage to sway and distort diplomacy. Active measures were "clandestine operations designed to further Soviet foreign policy goals," consisting of disinformation, forgeries, leaks to foreign media, and the channeling of aid to militant groups. Retired KGB Major General Oleg Kalugin described active measures as "the heart and soul of Soviet intelligence." During the Sino-Soviet split, "spy wars" also occurred between the USSR and PRC.
=== February === February 13, 2009: Netherlands The Dutch Statistics agency confirms the Netherlands are in recession since April 2008; with updated figures showing minor economic reductions in the 2nd and 3rd quarters of 2008, and a 0.9% reduction in the 4th quarter
Sources: en.wikipedia.org
The names are often used interchangeably in casual writing, but they are not strictly identical. Modified GRF(1-29) refers to the unconjugated analogue carrying only the four substitutions. The version sold as CJC-1295 with DAC includes the albumin binding linker and clears much more slowly.
DAC stands for drug affinity complex, a term describing the maleimidopropionic acid linker. This group forms a covalent bond with the cysteine residue on serum albumin after administration. The resulting adduct is what extends the circulating half life from minutes to days.
No. It is entirely synthetic and does not correspond to any known endogenous peptide. The design starts from human growth hormone releasing hormone and introduces deliberate substitutions. Any biological effect comes from mimicking the natural hormone at its receptor.
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.