A practical reference on NMR: what it is, how it behaves, what the literature reports, and where the honest uncertainties sit.
Reviewed 2025-09-11. Anything still debated is marked as such rather than presented as settled.
Nicotinamide mononucleotide, abbreviated NMN, is a naturally occurring nucleotide found in cells. Its structure combines a nicotinamide ring, a ribose sugar, and a phosphate group. As an intermediate in the NAD+ salvage pathway, NMN is converted to nicotinamide adenine dinucleotide, a coenzyme central to cellular redox reactions. NAD+ also serves as a substrate for enzymes involved in DNA repair, stress responses, and metabolic regulation. The compound is therefore part of normal cellular biochemistry rather than an exclusively synthetic molecule.
Two enzymatic steps define the canonical route from nicotinamide to NAD+. Nicotinamide phosphoribosyltransferase, known as NAMPT, produces NMN from nicotinamide and phosphoribosyl pyrophosphate. NMN adenylyltransferases, or NMNAT enzymes, then couple NMN with ATP to form NAD+. Whether intact NMN crosses cell membranes efficiently remains an active area of investigation; some studies propose direct transport, while others emphasize extracellular dephosphorylation to nicotinamide riboside followed by uptake. The relative contribution of each route likely depends on cell type, tissue, and experimental conditions.
Trace amounts of NMN have been reported in certain plant foods, including edamame, avocado, broccoli, cucumber, and cabbage. Reported concentrations vary widely because analytical methods differ and food matrices complicate extraction. Endogenous production in cells is generally considered more quantitatively important than dietary intake, though precise human turnover rates are difficult to establish. Commercial NMN for research or consumer products is commonly made through enzymatic synthesis or chemical phosphorylation routes. Regulatory classification differs by country; in some jurisdictions NMN is sold as a supplement, while in others it is treated as a novel food ingredient or restricted substance.
NMN is generally handled as a hygroscopic and light-sensitive solid in laboratory settings. Recommended storage is typically at -20°C or below, often under desiccation and protected from light. Aqueous solutions are less stable than the solid and may degrade through hydrolysis or other pathways, so fresh preparation is common for analytical work. Repeated freeze-thaw cycles can reduce sample integrity. Stability depends on pH, temperature, buffer composition, and the presence of metal ions, so specific shelf-life values should be determined experimentally rather than assumed.
Quality control for NMN samples often includes purity determination by HPLC, identity confirmation by mass spectrometry or NMR, and water content measurement by Karl Fischer titration. Certificates of analysis may report residual solvents, heavy metals, and microbial limits depending on the intended use. Purity values are method-dependent, so a stated percentage should be interpreted alongside the analytical procedure and detection wavelength. Reference standards help ensure that retention times and spectral data are comparable across laboratories. Researchers increasingly request independent verification because supply chains for specialty chemicals can vary in documentation.
| Property | Value | Notes |
|---|---|---|
| Molecular formula | C11H15N2O8P | Canonical beta anomer; charge state depends on pH. |
| Molar mass | 334.22 g/mol | Calculated for the neutral formula. |
| CAS Registry Number | 1094-61-7 | Common identifier for beta-nicotinamide mononucleotide. |
| Appearance | White to off-white powder or crystals | Varies with purity, hydration, and polymorphism. |
| Solubility | Freely soluble in water; low solubility in nonpolar solvents | Reported values depend on salt form and temperature. |
The American Way supermercato the year before and Supermarket USA were among the first of several instances in which American supermarkets were deployed internationally at the height of the Cold War as shock and awe instruments of American propaganda to demonstrate the supposed superiority of Western Bloc capitalism over Eastern Bloc communism. Before then, a few countries had already begun to implement supermarkets due to their proximity to or affinity for the United States. Canada, to the north, had implemented the new retail format at the same time during the 1930s. For example, Québec's first supermarket opened in 1934 in Montréal, under the banner Steinberg's. In Canada, the largest supermarket chain is Loblaw, which operates stores under a variety of banners targeted to different segments and regions, including Fortinos, Zehrs, No Frills, the Real Canadian Superstore, and Loblaws, the foundation of the company. Sobeys is Canada's second largest supermarket with locations across the country, operating under many banners (Sobeys IGA in Quebec). In the United Kingdom, self-service shopping took longer to become established, despite its Special Relationship with the United States. In 1947, there were just ten self-service shops in the country. In 1951, ex-US Navy sailor Patrick Galvani, son-in-law of Express Dairies chairman, made a pitch to the board to open a chain of supermarkets across the country.
=== Hoffman Instrumentation Supply Inc === In 2019, Hoffman Instrumentation Supply Inc was a component vendor to Edwards' US, subsidiary Edwards Vacuum LLC, and held talks about becoming exclusive supplier for some items. It was also proposed that Hoffman would construct subassemblies and complete systems, but only for Edwards. One of Hoffman's key customers enquired whether it could provide a vacuum system that would work with pumps other than Edwards'. Hoffman informed Edwards whose response was to suggest purchasing Hoffman. Information was provided about Hoffman to Edwards for due diligence, under a non disclosure agreement, in order to progress the acquisition. It included technical specifications for the pump agnostic vacuum system and Hoffman's cost structures. The parties did not agree terms to purchase Hoffman and Edwards withdrew from the process. A group of employees left Edwards to work for Hoffman and in 2020, Edwards sought an injunction against Hoffman to prevent misuse of the ex employees's trade secrets. Hoffman counter claimed Edwards used the confidential due diligence information to pitch their products to Hoffman's key customer at prices just below Hoffman's own intended level, and to demand cost reductions from suppliers to match those obtained by Hoffman.
== June 17, 1915 (Thursday) == Second Battle of Artois — French forces launched a second attack on Vimy Ridge but failed to take it. British pilot Reginald Warneford died along with American journalist Henry Beach Newman after crashing a new Farman biplane during takeoff from Buc, France, just shortly after a ceremony in Paris in which he received the French Legion of Honour for shooting down a German airship. Former U.S. President William Howard Taft became president of the League to Enforce Peace when it was established during a peace convention at Independence Hall in Philadelphia. Other founding members of the organization included Elihu Root, Alexander Graham Bell, Rabbi Stephen Samuel Wise, U.S. Chamber of Commerce executives James Gibbons and Edward Filene, Harvard University President A. Lawrence Lowell, and former U.S. Cabinet member and diplomat Oscar Straus. The baseball stadium Bosse Field officially opened in Evansville, Indiana, the first municipally owned stadium in the United States. It is the third oldest operating ballpark after Fenway Park and Wrigley Field. Born: Mario Echandi Jiménez, 33rd President of Costa Rica from 1958 to 1962; in San José, Costa Rica (d. 2011) David "Stringbean" Akeman, American country musician, member of band for the TV variety show Hee Haw and a member of the Grand Ole Opry; in Annville, Kentucky, United States (d. 1973, murdered) Died: Thomas Jordan Jarvis, 79, American politician, 44th Governor of North Carolina (b. 1836)
SUMOylation Also sumoylation. A type of post-translational modification in which a SUMO protein is conjugated to a polar residue of another protein (usually a lysine) via a covalent isopeptide bond. This effectively tags the second protein, making it distinguishable to other biomolecules and in many cases allowing it to participate in specific reactions or to interact with specific protein complexes. SUMOlyation is closely related to ubiquitination, relying on the same E1/E2/E3 enzymes to transfer SUMO to specific recognition motifs in the target protein, though detaching SUMO depends on SUMO-specific proteases. It plays important roles in numerous cellular processes, including protein localization, transcriptional regulation, stress-response pathways, and cell cycle checkpoints, among others. SUMOlyation is also used in the laboratory as a molecular label and to help solubilize proteins which are difficult to purify.
Sources: en.wikipedia.org
=== Androgen deficiency === Primary hypogonadism (indicating an intrinsic problem with the testes in males) leads to decreased testosterone synthesis and increased conversion of testosterone to estradiol, potentially leading to a gynecomastic appearance. Klinefelter syndrome is a notable example of a disorder that causes hypogonadism and gynecomastia, and has a higher risk of breast cancer in males (20–50 times higher than males without the disorder). Secondary hypogonadism (indicating a problem with the brain) leads to decreased production and release of luteinizing hormone (LH, a stimulatory signal for endogenous steroid hormone synthesis) which leads to decreased production of testosterone and estradiol in the testes.
=== Sclerodactyly === Though it is the most easily recognizable manifestation, it is not prominent in all patients. Thickening generally only involves the skin of the fingers distal to the metacarpophalangeal joints in CREST. Early in the course of the disease, the skin may appear edematous and inflamed. Eventually, dermal fibroblasts overproduce extracellular matrix leading to increased tissue collagen deposition in the skin. Collagen cross-linking then causes a progressive skin tightening. Digital ischemic ulcers commonly form on the distal fingers in 30–50% of patients.
In 1980 the FDA removed the dwarfism indication from the label for stanozolol since human growth hormone drugs had come on the market, and mandated that the label for stanozolol and other steroids say: "As adjunctive therapy in senile and postmenopausal osteoporosis. AAS are without value as primary therapy but may be of value as adjunctive therapy. Equal or greater consideration should be given to diet, calcium balance, physiotherapy, and good general health promoting measures." and gave Sterling a timeline to submit further data for other indications it wanted for the drug. Sterling submitted data to the FDA intended to support the effectiveness of Winstrol for postmenopausal osteoporosis and aplastic anemia in December, 1980 and August 1983 respectively. The FDA's Endocrinologic and Metabolic Drugs Advisory Committee considered the data submitted for osteoporosis in two meetings held 1981 and the data for aplastic anemia in 1983. In April 1984, the FDA announced that the data was not sufficient, and withdrew the marketing authority for stanozolol for senile and postmenopausal osteoporosis and for raising hemoglobin levels in aplastic anemia. In 1988, Sterling was acquired by Eastman Kodak for $5.1 billion and in 1994 Kodak sold the drug business of Sterling to Sanofi for $1.675 billion. Sanofi had stanozolol manufactured in the US by Searle, which stopped making the drug in October 2002. Even with no drug in production, Sanofi sold the stanozolol business to Ovation Pharmaceuticals in 2003, along with the two other drugs.
21 April In one of the first Fragging incidents of the war, a grenade was thrown into the office of K Company, 9th Marine Regiment, at Quảng Trị Combat Base, killing First Lieutenant Robert T. Rohweller. Private Reginald F. Smith pleaded guilty to the premeditated murder and was sentenced to 40 years' imprisonment; he died in custody on 25 June 1982.
== History == Metropolis was founded by Dr. Sushil Kanubhai Shah in 1980. The healthcare company was started as a single diagnostic laboratory in Mumbai. Shah's daughter, Ameera Shah, took over the pathology business in 2001. The company started out by partnering with local and regional diagnostic chains, thereby spreading its reach across the country. Metropolis Healthcare has expanded into new service areas, like Clinical Research, Hospital Lab Management and Wellness Solutions, in the past decade. Metropolis Healthcare began its international expansion in 2005 with Sri Lanka being the first market. It further expanded to UAE in 2006, followed by Kenya in 2013 and Mauritius and Ghana in 2014. In February 2018, Metropolis partnered with National Aids Control Organisation (NACO) for a three-year project for diagnosis of HIV at 560 locations in India. As of 2018, the diagnostic chain consists of 124 clinical laboratories and 2400 blood collection centers across India, Ghana, Kenya, Zambia, Uganda, Mauritius and Sri Lanka. In October 2019, Metropolis Healthcare acquired four individual laboratories, Doctor's Clinical Laboratory, Iyer Pathology Laboratory, Nagar Pathology Laboratory and Yash Clinical Laboratory, a subsidiary of Dr Lal PathLabs in Surat, Gujarat, for INR 18 crore. The acquisition was done in order to expand the penetration of Metropolis's wholly owned subsidiary Desai Laboratories. In October 2021, Metropolis completed the acquisition of South Indian diagnostic chain Hitech Diagnostic Centre and its subsidiary Centralab Healthcare Services for ₹636 crore.
Sources: en.wikipedia.org
NMN is nicotinamide mononucleotide, a nucleotide intermediate in NAD+ metabolism. It occurs naturally in cells and can also be produced synthetically for research or commercial use. Its name reflects its composition: nicotinamide, ribose, and a phosphate group.
NMN is a direct precursor in the NAD+ salvage pathway. NMNAT enzymes convert NMN and ATP into NAD+, a coenzyme used in many cellular reactions. This relationship makes NMN a focus of studies on NAD+ metabolism.
Small amounts of NMN have been reported in some plant foods, but measured levels vary and are not consistently quantified. Dietary contribution is generally considered minor compared with endogenous production. Food-matrix effects make accurate analysis difficult.
NMN is commonly detected by HPLC-UV, LC-MS, or LC-MS/MS. These methods separate the compound from related substances and identify it by retention time and mass.