Everything below concerns deamidation. We keep the language plain, cite what the science says, and separate well-supported claims from open questions.
Last reviewed on 2026-05-15. Where a claim depends on a specific study, the study is described rather than over-claimed.
Stability studies focus on deamidation of asparagine and glutamine residues, oxidation of methionine, and aggregation into higher-order species. The fatty acid side chain adds susceptibility to oxidative change and can promote self-association at high concentration. Lyophilised material is comparatively robust when kept cold and dry, while aqueous solutions require refrigeration and protection from light. Forced degradation experiments under heat, acid, base, and peroxide conditions establish the specificity of each analytical method. Which degradation route dominates under real storage conditions depends on the formulation and stays formulation-specific.
Handling guidance for research quantities calls for single-use aliquots, an inert atmosphere where practical, and avoidance of repeated freeze-thaw cycles that accelerate aggregation. Certificates of analysis typically report purity by peak area, water content, counter-ion identity, and residual solvent levels. In the scientific literature the compound is usually described by its full amino acid sequence, its registry number, or its structural class rather than by any proprietary label. Reporting standards vary between journals, and reviewers increasingly request raw chromatograms alongside tabulated purity figures. Whether current purity thresholds are adequate for every experimental context is debated.
The company that developed the compound filed it as a long-acting analogue, and it gained first approval in 2017 for type 2 diabetes. Later authorisations from several regulators extended the indication to chronic weight management, and the World Health Organization added the glucagon-like peptide-1 receptor agonist drug class to its model list of essential medicines in 2023. Production uses solid-phase peptide synthesis followed by side-chain conjugation and chromatographic purification. Supply constraints and cost differences across regions are well documented. Literature on long-term outcomes continues to grow, with many trials reporting surrogate endpoints rather than hard clinical endpoints.
Semaglutide is a synthetic peptide of thirty-one amino acids that shares roughly ninety-four percent sequence identity with human glucagon-like peptide-1. Two substitutions resist enzymatic cleavage by dipeptidyl peptidase-4, and a fatty diacid side chain attached through a linker promotes binding to serum albumin. That albumin binding slows renal clearance and extends the circulating half-life from minutes to approximately one week. The structural changes are well established in the published literature. Whether the same modifications affect receptor signalling bias in ways that matter clinically remains an open question.
Pharmacological activity arises from agonism at the glucagon-like peptide-1 receptor, a G protein-coupled receptor expressed in the pancreas, the gastrointestinal tract, and the brainstem. Receptor activation raises intracellular cyclic adenosine monophosphate and enhances insulin release in a glucose-dependent manner, an effect that diminishes when blood glucose concentration is low. Other effects include slowed gastric emptying and hypothalamic satiety signalling. These pathways are described well. Receptor desensitisation rates across tissues, relative to the endogenous hormone, are still under investigation, and reported findings differ between laboratories.
| Property | Value | Notes |
|---|---|---|
| Typical purity assay | reversed-phase HPLC, 220 nm | Amide-bond detection for the peptide backbone |
| Identity confirmation | electrospray mass spectrometry | Peptide mapping used for sequence coverage |
| Related substances | deamidated and oxidised forms | Truncated sequences also monitored |
| Powder storage | -20 degrees Celsius | Keep sealed, dry, and protected from light |
| Solution storage | 2 to 8 degrees Celsius | Avoid repeated freeze-thaw cycling |
Storage guidance for the finished injectable product distinguishes the unused state from the in-use state. Before first use, pens are kept refrigerated between 2 and 8 degrees Celsius, protected from light, and never frozen, since freezing can disrupt the peptide or the device. After first use, label instructions in several markets permit storage at room temperature up to about 30 degrees Celsius for a limited number of days. Solid research-grade material is normally held at or below minus 20 degrees Celsius, often with desiccant, and allowed to equilibrate before opening.
Quantification and purity assessment rely on separation methods coupled to optical or mass detection. Reversed-phase high-performance liquid chromatography resolves the intact peptide from related impurities and is the standard assay technique. Size-exclusion chromatography measures aggregates, while ion-exchange chromatography separates charge variants produced by deamidation. Mass spectrometry confirms identity and detects mass shifts of a few daltons. In biological matrices, liquid chromatography with tandem mass spectrometry is often used because immunoassays can cross-react with endogenous GLP-1 or with circulating fragments.
Receptor activation follows the canonical Gs pathway: binding increases intracellular cyclic AMP, which promotes protein kinase A activity. In pancreatic beta cells this amplifies glucose-dependent insulin release, so secretion rises when blood glucose is high and changes little when it is low. The same signalling suppresses glucagon release from alpha cells and slows gastric emptying. Receptors in the hypothalamus and brainstem are thought to contribute to reduced appetite and lower energy intake. Which of these effects dominates clinical outcomes remains an area of active study.
Semaglutide is a synthetic peptide analogue of glucagon-like peptide-1, a gut hormone released by intestinal L cells after food intake. The natural hormone acts on pancreatic and central receptors but is degraded within minutes by dipeptidyl peptidase-4 and other peptidases. Semaglutide belongs to the class of long-acting GLP-1 receptor agonists, a group distinguished by structural changes that slow breakdown and extend circulation time. Its development followed earlier short-acting analogues and reflects a general strategy in peptide drug design: preserve receptor activity while blocking proteolytic clearance.
== Biotransformation == After the bite of Bungarus multicinctus the venom enters the bloodstream and enters the circulation and ends up in the central and peripheral nervous system. Since κ-bungarotoxin has a high affinity for nAChRs the venom will target the tissues rich in nAChRs. Together with its prolonged, potentially irreversible binding, there will not be much κ-bungarotoxin available in the bloodstream, but it will remain localized in the central nervous system and ganglia. Unbound nAChRs will only be available through de novo synthesis of these receptors. Though biotransformation of κ-bungarotoxin is not sufficiently researched, the long-chain three-finger toxins (3FTx) family member blocks ion channels on the postsynaptic membrane. Therefore, it is suggested that the toxin works extracellularly, and can thus not be biotransformed by the cytochrome P450 enzymes. κ-Bungarotoxin is a protein and can thus be gradually degraded by enzymes such as peptidases and lysosomes. The result will be smaller peptides and amino acids, which can be used for the synthesis of endogenous compounds. However, since the κ-bungarotoxin's affinity for the neuronal nAChR is very high, not much of the protein can be degraded before the ligand-receptor complex is formed.
Access to transition care, mental care, and other issues affecting transgender people is very limited; there is only one comprehensive transgender health care clinic available in South Africa. Additionally, the typical lack of access to transition options that comes as a result of gatekeeping is compounded by the relatively limited knowledge of transgender topics among psychiatrists and psychologists in South Africa.
The first body segment (segment number 1) features both the earthworm's mouth and, overhanging the mouth, a fleshy lobe called the prostomium, which seals the entrance when the worm is at rest, but is also used to feel and chemically sense the worm's surroundings. Some species of earthworm can even use the prehensile prostomium to grab and drag items such as grasses and leaves into their burrow. An adult earthworm develops a belt-shaped glandular swelling, called the clitellum, which covers several segments toward the front part of the animal. This is part of the reproductive system and produces egg capsules. The posterior segment is most commonly cylindrical like the rest of the body, but depending on the species, it may also be quadrangular, octagonal, trapezoidal, or flattened. The last segment is called the periproct; the earthworm's anus, a short vertical slit, is found on this segment.
This "water mafia" controls major infrastructure projects like dam construction, prioritizing financial and political gains over environmental and social considerations. The IRGC's dominance undermines sustainable water policies, contributing to Iran's ongoing water crisis and highlighting the complex interplay between power, corruption, and resource management.
is the molar latent heat of melting. In most substances, the volume increases when melting occurs, so the melting temperature increases with pressure. However, because ice is less dense than water, the melting temperature decreases. In glaciers, pressure melting can occur under sufficiently thick volumes of ice, resulting in subglacial lakes. The Clausius-Clapeyron relation also applies to the boiling point, but with the liquid/gas transition the vapor phase has a much lower density than the liquid phase, so the boiling point increases with pressure. Water can remain in a liquid state at high temperatures in the deep ocean or underground. For example, temperatures exceed 205 °C (401 °F) in Old Faithful, a geyser in Yellowstone National Park. In hydrothermal vents, the temperature can exceed 400 °C (752 °F). At sea level, the boiling point of water is 100 °C (212 °F). As atmospheric pressure decreases with altitude, the boiling point decreases by 1 °C every 274 meters. High-altitude cooking takes longer than sea-level cooking. For example, at 1,524 metres (5,000 ft), cooking time must be increased by a fourth to achieve the desired result. Conversely, a pressure cooker can be used to decrease cooking times by raising the boiling temperature. In a vacuum, water will boil at room temperature.
Sources: en.wikipedia.org
Second Battle of Artois — In what was referred to as the Second Action of Givenchy, British and Canadian forces attacked northwest of La Bassée, France and captured the front line, but were pushed back by German grenades and a shortage of ammunition. An official inquiry led by Lord Mersey into the sinking of the RMS Lusitania began at Methodist Central Hall in Westminster, London. French airplanes raided Baden and Karlsruhe, Germany. Armenian genocide — A group of 20 activists with the Social Democrat Hunchakian Party were hanged in the Sultan Beyazıt Square of Constantinople. Among those executed were Armenian leaders Paramaz, Aram Achekbashian, and Kegham Vanigian. Other Armenian leaders who were executed that same day while en route to Severek, Turkey included Harutiun Jangülian, Rupen Zartarian, Sarkis Minassian, Khachatur Malumian, and Nazaret Daghavarian. Japanese Government Railways extended the Echigo Line in the Niigata Prefecture, Japan, with station Arahama serving the line. The Cornish Library opened in Winnipeg. It received damage from flooding in 1918 and was repaired. The sports club Magni Grenivík was established in Grenivík, Iceland. The village of Denmark, Wisconsin was established. Born: Thomas Huckle Weller, American virologist, recipient of the Nobel Prize in Physiology or Medicine for his research into poliomyelitis viruses; in Ann Arbor, Michigan, United States (d. 2008) Died: Konstantin Konstantinovich, 56, Russian noble, grandson of Nicholas I of Russia (b. 1862)
With this model, journalists can instead focus on the positives of a story and ask questions about how conflicts or even tragedies have brought people together, how someone has experienced post-traumatic growth, and more. News stories then shift the perspective from a victimizing one to an uplifting one. Positive psychology is slowly but steadily making its way through news reporting via constructive journalism. PERMA helps journalists ask the right questions to continue that progress by bringing the focus of a potentially negative story to the positives and solutions.
Dominance among crustaceans is also mediated through chemical cues. When crustaceans fight to determine dominance they urinate into the water. Later, if they meet again, both individuals can recognize each other by pheromones contained in their urine, allowing them to avoid a fight, if dominance has already been established. When a lobster encounters the urine of another individual, it will act differently according to the perceived status of the urinator (e.g. more submissively when exposed to the urine of a more dominant crab, or more boldly when exposed to the urine of a subdominant individual). When individuals are unable to communicate through urine, fights may be longer and more unpredictable.
When she got to the emergency room, her facial paralysis was coming in and out, because of this she was placed into the stroke ward for observation and a CAT scan and MRI was ordered that resulted negative. A neurologist came in and told her it was all just a psychosomatic response to stress and nothing more. A big reason she does not trust doctors is for the fact that she is a woman of color, and she feels she's not heard by the generic privileged doctor complex. When reaching out to Dr. Lisa Sanders, both Joe and Ann had already been tested and ruled out for dozens of diseases such as Multiple Sclerosis, Parkinson's, and Lupus. Joe specifically has two very serious illnesses, the first one being his unexplained paralysis and the second being an incurable form of blood cancer he was diagnosed with 15 years back. Joe thought he only had a few years to live, but he was placed on a clinical trial that has kept him alive until this day. Dr. Lisa Sanders now wants to know if his blood cancer has anything to do with his paralysis, especially now that he has movement in his toes. Dr. Lisa Sanders published both Joe and Ann’s stories on different columns to gain different traction from the audience and to not create confusion. The first column published was for Joe’s symptoms and this generated hundreds of responses. The two most reasonable possibilities are CIDP, Chronic Inflammatory Polyneuropathy, aka Guillain-Barre syndrome or the paralysis is a side effect of the clinical drug, Ibrutinib, he is taking to control his blood cancer.
Sources: en.wikipedia.org
=== Plasma synthesis === Plasma synthesis has evolved to be one of the most popular gas-phase approaches for the production of quantum dots, especially those with covalent bonds. For example, silicon and germanium quantum dots have been synthesized by using nonthermal plasma. The size, shape, surface and composition of quantum dots can all be controlled in nonthermal plasma. Doping that seems quite challenging for quantum dots has also been realized in plasma synthesis. Quantum dots synthesized by plasma are usually in the form of powder, for which surface modification may be carried out. This can lead to excellent dispersion of quantum dots in either organic solvents or water (i. e., colloidal quantum dots).
=== Institutions === According to an evaluation by Helena Machado, investigator at the University of Minho, that has investigated this field, "The Rui Pedro case didn't mobilize the investigative police's resources that were used in the Madeleine McCann case. And much less captured the attention or involvement of Government members, as in the case of the British girl (...) [Adding the lack of contacts with power ties] all the necessary ingredients to captivate the media and audience weren't met, it contained all the ingredients to be an exceptionally noticeable criminal narrative". According to Dulce Rocha, president of the Child Support Institute, "The Rui Pedro case was a landmark, it sparked a bigger sensitivity to cases like this one". For Patrícia Cipriano, president of the Portuguese Association of Missing Children, "The police had the humility of owning that there flaws in the past, which is of great importance to change mentalities of those who investigate and the procedures used (...) There is a more sensitized, committed and careful attitude from the authorities (...) there are still cops that persist in the error of informing the missing child's parents that they can only accept the report 48 hours after the disappearance (...) [An attitude that is] inadmissible, wrong and irresponsible".
=== Western culture === The scorpion with its powerful sting has been used as the name or symbol of various products and brands, including Italy's Abarth racing cars. In the Roman army, the scorpio was a torsion siege engine used to shoot a projectile. The British Army's FV101 Scorpion was an armoured reconnaissance vehicle or light tank in service from 1972 to 1994. It holds the Guinness world record for the fastest production tank. A version of the Matilda II tank, fitted with a flail to clear mines, was named the Matilda Scorpion. Several ships of the Royal Navy have been named HMS Scorpion, including an 18-gun sloop in 1803, a turret ship in 1863, and a destroyer in 1910. A hand- or forearm-balancing asana in modern yoga as exercise with the back arched and one or both legs pointing forwards over the head is called Scorpion pose, a pose of yoga which was originated in ancient India and influential practice in classical Hinduism which is currently becoming popular in the West. A variety of martial arts films and video games have been entitled Scorpion King. A Montesa scrambler motorcycle was named Scorpion. Scorpions have equally appeared in western artforms including film and poetry: the surrealist filmmaker Luis Buñuel made symbolic use of scorpions in his 1930 classic L'Age d'or (The Golden Age), while Stevie Smith's last collection of poems was entitled Scorpion and other Poems.
Burkholderia pseudomallei (also known as Pseudomonas pseudomallei) is a Gram-negative, bipolar, aerobic, motile rod-shaped bacterium. It is a soil-dwelling bacterium endemic in tropical and subtropical regions worldwide, particularly in Thailand and northern Australia. It was reported in 2008 that there had been an expansion of the affected regions due to significant natural disasters, and it could be found in Southern China, Hong Kong, and countries in the Americas. B. pseudomallei, amongst other pathogens, has been found in monkeys imported into the United States from Asia for laboratory use, posing a risk that the pathogen could be introduced into the country. Although it is mainly a soil-dwelling bacterium, one study showed that Burkholderia pseudomallei survived in distilled water for 16 years, demonstrating that it is capable of living in water if a specific environment is provided. It is resistant to a variety of harsh conditions including nutrient deficiency, extreme temperature or pH. It infects humans, causing the disease melioidosis; mortality is 20–50% even with treatment. The CDC classifies it as a "Tier 1 select agent" with potential as a bioterrorism agent. It infects other animals, most commonly livestock such as goats, pigs, and sheep, less frequently. It is also capable of infecting plants in a laboratory setting. Burkholderia pseudomallei measures 2–5 μm in length and 0.4–0.8 μm in diameter and is capable of self-propulsion using flagella.
Progesterone is produced from cholesterol with pregnenolone as a metabolic intermediate. In the first step in the steroidogenic pathway, cholesterol is converted into pregnenolone, which serves as the precursor to the progestogens progesterone and 17α-hydroxyprogesterone. These progestogens, along with another steroid, 17α-hydroxypregnenolone, are the precursors of all other endogenous steroids, including the androgens, estrogens, glucocorticoids, mineralocorticoids, and neurosteroids. Thus, many tissues producing steroids, including the adrenal glands, testes, and ovaries, produce progestogens. In some tissues, the enzymes required for the final product are not all located in a single cell. For example, in ovarian follicles, cholesterol is converted to androstenedione, an androgen, in the theca cells, which is then further converted into estrogen in the granulosa cells. Fetal adrenal glands also produce pregnenolone in some species, which is converted into progesterone and estrogens by the placenta (see below). In the human, the fetal adrenals produce dehydroepiandrosterone (DHEA) via the pregnenolone pathway.
Sources: en.wikipedia.org
Purity is commonly expressed as the percentage of the main peak relative to all integrated peaks in a reversed-phase chromatogram. Related substances and counter-ions are reported separately. Values obtained with different detectors are not always directly comparable.
Aggregation is driven by hydrophobic contacts, especially those involving the fatty acid side chain, and is accelerated by heat, agitation, and repeated freezing and thawing. Low pH and suitable excipients can reduce the rate. The tendency differs between formulations.
Dry powder has low molecular mobility and tolerates colder storage for longer periods. Water enables hydrolysis and conformational change, so dissolved material is kept refrigerated and used within a shorter window.
It is a glucagon-like peptide-1 receptor agonist, often grouped with the incretin mimetics. Its backbone is modified from the human hormone to resist enzymatic degradation and to bind albumin. These two features distinguish it from the native peptide.