Everything below concerns Salvage pathway. We keep the language plain, cite what the science says, and separate well-supported claims from open questions.
Last reviewed on 2026-05-21. Where a claim depends on a specific study, the study is described rather than over-claimed.
Nicotinamide mononucleotide, commonly abbreviated NMN, is a naturally occurring nucleotide found in the cells of many organisms. Its structure consists of a nicotinamide group linked to a ribose sugar that carries a phosphate group. NMN is an intermediate in the biosynthesis of nicotinamide adenine dinucleotide, or NAD+, a coenzyme involved in many metabolic reactions. The abbreviation usually refers to the beta anomer, though related forms can exist. In scientific literature, NMN is distinct from nicotinamide riboside, another NAD+ precursor.
In the NAD+ salvage pathway, the enzyme NAMPT converts nicotinamide and a phosphate-donor molecule into NMN. A second enzyme, NMNAT, then converts NMN into NAD+. Nicotinamide riboside can also enter this route after being converted to NMN by nicotinamide riboside kinases. Because NMN sits at a junction between precursor uptake and NAD+ formation, its cellular concentration is tightly linked to enzyme activity and tissue type. NAD+ participates in redox reactions, signaling, and DNA repair, and its levels decline with age in some animal models, though human evidence remains more limited and context-dependent.
Research interest in NMN increased after animal studies reported that oral or injected NMN can raise NAD+ levels in some tissues. How NMN is absorbed and distributed in humans is not fully established. Some evidence suggests extracellular NMN may be dephosphorylated to nicotinamide riboside before cellular uptake, while other studies propose specific transport routes. Direct human data on these mechanisms remain limited. Regulatory status also varies: in some countries NMN is treated as a dietary supplement, while elsewhere it is restricted or requires approval, and these differences affect labeling, sale, and research.
Nicotinamide mononucleotide, commonly abbreviated NMN, is a naturally occurring nucleotide. Its structure consists of a nicotinamide ring attached to a ribose sugar that carries a phosphate group. The molecular formula is C11H15N2O8P, and the molar mass is about 334.22 grams per mole. In cells, NMN is an intermediate in the salvage pathway that recycles nicotinamide to maintain NAD+ levels. It is not the same compound as NAD+, although it is a direct precursor in one enzymatic step.
Inside cells, the enzyme nicotinamide phosphoribosyltransferase, or NAMPT, converts nicotinamide and a ribose-phosphate donor into NMN. A second enzyme, NMN adenylyltransferase, then converts NMN into NAD+. NAD+ participates in redox reactions and serves as a substrate for signaling enzymes such as sirtuins, PARPs, and CD38. Because NAD+ levels tend to decline with age in many organisms, NMN has drawn interest as a possible way to influence that decline. Whether oral NMN reliably raises NAD+ in human tissues, and whether any such change modifies disease risk, remain open research questions.
| Property | Value | Notes |
|---|---|---|
| Chemical name | Nicotinamide mononucleotide | Common name; beta form often denoted beta-NMN |
| Chemical formula | C11H15N2O8P | As free acid; salt forms differ |
| Molar mass | 334.22 g/mol | Calculated for the free acid |
| CAS Registry Number | 1094-61-7 | For beta-nicotinamide mononucleotide |
| Biochemical role | NAD+ intermediate | Participates in the salvage biosynthesis pathway |
Nicotinamide mononucleotide, commonly abbreviated NMN, is a pyridine nucleotide that consists of a nicotinamide ring, a ribose sugar, and a phosphate group. It is an intermediate in the salvage pathway for nicotinamide adenine dinucleotide, or NAD+, synthesis. In mammalian cells, the enzyme nicotinamide phosphoribosyltransferase produces NMN from nicotinamide and phosphoribosyl pyrophosphate. Nicotinamide mononucleotide adenylyltransferases then convert NMN into NAD+. The core structure and enzymatic route are well established in biochemical literature.
The biologically relevant form of NMN is generally the beta anomer, which is recognized by NMN adenylyltransferases. NMN is polar and water soluble, and it does not readily diffuse across lipid membranes without assistance. Whether intact NMN enters cells through a specific transporter remains an open question; some studies propose solute carrier family members, while other work favors extracellular dephosphorylation to nicotinamide riboside followed by uptake. This transport and compartmentalization debate affects how researchers interpret oral administration studies. The distinction between intracellular synthesis and extracellular delivery is central to current discussion.
Nicotinamide mononucleotide, usually shortened to NMN, is a naturally occurring nucleotide. Its structure consists of a nicotinamide base linked to a ribose sugar that carries a phosphate group. In cells, NMN serves as an intermediate in the salvage pathway that produces nicotinamide adenine dinucleotide, or NAD+. Because NAD+ participates in many oxidation-reduction reactions, NMN sits near central metabolic processes. The compound is not a drug in most jurisdictions and is discussed mainly in biochemistry and nutrition research.
The term NMN commonly refers to the beta isomer, in which the nicotinamide group is attached to the ribose through a beta-glycosidic bond. Commercial material may be supplied as the free acid or as a salt, such as a sodium salt, which affects molecular weight and water solubility. Related compounds include nicotinamide riboside and NAD+ itself, but these are distinct molecules with different formulas and cellular handling. Laboratory research often uses the beta form because it matches the naturally occurring configuration found in biological systems.
Beyond its intracellular synthesis, NMN can be taken up from the extracellular environment, although the routes are still debated. Some evidence points to direct transport into cells through specific transporters, while other work suggests dephosphorylation to nicotinamide riboside followed by cellular uptake. Once inside, NMN can be converted to NAD+ by NMN adenylyltransferases; the relative contribution of these routes may differ by tissue, species, and experimental conditions. Researchers continue to investigate which mechanisms dominate in intact organisms and how they affect measured NAD+ levels. Direct measurement in tissues remains technically challenging because NMN can be rapidly metabolized during sample collection.
NMN occurs in many living systems, including bacteria, yeast, plants, and mammals. Dietary sources are present in foods such as edamame, avocado, broccoli, and various meats, but amounts vary widely and are generally lower than those used in research settings. Laboratory production often relies on enzymatic synthesis or chemical phosphorylation of nicotinamide riboside, and commercial material is typically supplied as a white to off-white powder. Because NMN is hygroscopic and sensitive to heat, moisture, and pH extremes, its handling requires care to preserve identity and purity. Aqueous preparation should be done with attention to pH and temperature to limit hydrolysis.
M-protein functions to stabilize the M-line cross-linking titin and myosin; the central portion of M-protein is around the M1-line, and the N-terminal and C-terminal regions are arranged along thick filaments. An animal model of thyroid hormone (T3)-induced cardiac hypertrophy showed that T3 rapidly reduced levels of M-protein; and siRNA reduction of M-protein in neonatal cardiomyocytes showed that the absence of M-protein causes significant contractile dysfunction (77% reduction in contraction velocity), thus illuminating the importance of M-protein for normal sarcomere function. M-protein can be post-translationally modified in vivo. M-protein fragments generated via cleavage by matrix metalloproteinase 2 in left ventricular myocardium have been identified as a factor in the development of pulmonary hypertension and ascites in broiler chickens. Another study demonstrated that M-protein is S-thiolated during post-ischemic reperfusion. It was also determined that domains Mp2 to Mp3 in M-protein binds myosin, and this specific interaction can be regulated by phosphorylation.
=== Singles and music videos === Let God Sort Em Out's lead single "Ace Trumpets" was released on May 30, 2025. The song garnered media attention for lyrics that reference Pusha T's former boss and long-standing creative partner West, interpreted by some as being dismissive of West's public outbursts. "Ace Trumpets", with its "icy drums, lush synths, and unsettling elegance", received positive reviews from music critics. Alex Hudson of Exclaim! commented: "The beat certainly isn't Pharrell's hookiest, but the thundering 808 bludgeons with pure muscle. Hell yeah—welcome back, guys." Tom Breihan of Stereogum wrote: "Pusha and Malice both sound cold and imperious. Malice's verse is a real masterclass." Dash Lewis of Pitchfork called the song "a menacing return to form for the coke rap auteurs. Pharrell Williams' beat, with its rimshot snare, chest-caving bass, and synth drone that sounds like a screwed-down tornado siren, conveys the same creeping tension he supplied Pusha with for 2022's It's Almost Dry." A lyric video was released on June 4. Described by publications as the second single, promotional single "So Be It" was released exclusively as a black-and-white Hannan Hussain-directed music video via YouTube and Instagram on June 17, depicting Clipse in a mansion with various classic luxury cars on the property. Some fans and journalists mistakenly thought the song was a diss toward West based on previewed lyrics. "So Be It" was well received by critics. Zachary Horvath of HotNewHipHop wrote that "potential dissing aside, the music is great on its own.
Because the Apollo 13 Moon landing was aborted, its RTG rests in the South Pacific Ocean, in the vicinity of the Tonga Trench. The Curiosity and Perseverance Mars rover designs selected RTGs to allow greater flexibility in landing sites and longer lifespan than the solar-powered option, as used in prior generations of rovers. RTGs were also used for the Nimbus, Transit and LES satellites. By comparison, only a few space vehicles have been launched using full-fledged nuclear reactors: the Soviet RORSAT series and the American SNAP-10A. In addition to spacecraft, the Soviet Union built 1,007 RTGs to power uncrewed lighthouses and navigation beacons on the Soviet Arctic coast by the late 1980s. Many different types of RTGs (including Beta-M type) were built in the Soviet Union for a wide variety of purposes. The lighthouses were not maintained for many years after the dissolution of the Soviet Union in 1991. Some of the RTG units disappeared during this time—either by looting or by the natural forces of ice/storm/sea. In 1996, a project was begun by Russian and international supporters to decommission the RTGs in the lighthouses, and by 2021, all RTGs had been removed. As of 1992, the United States Air Force also used RTGs to power remotely-located Arctic equipment, and the US government has used hundreds of such units to power remote stations globally. Sensing stations for Top-ROCC and SEEK IGLOO radar systems, predominantly located in Alaska, use RTGs.
Sources: en.wikipedia.org
=== Psoriasis === Pro-inflammatory (M1) macrophages are responsible for the progression of psoriasis. They are mainly derived from infiltrated monocytes. M1 macrophages' population could be as high as 60% of all the infiltrated immune cells during the disease onset. They are the primary source of TNF-a, which leads to lesion development when there is a prolonged production of TNF-a. TNF-a could also trigger M1 polarisation, which leads to further exaggeration of the disease. M1 macrophage ablation via adalimumab administration could alleviate psoriasis.
The playground features train-themed equipment with an educational plaque explaining Jones' mobile refrigeration technology. In 2022, several Black-owned breweries honored Jones during Black History Month. They released commemorative beers featuring the likeness of notable figures in Black history, including Jones.
Freeman's sole film release of 2010 was Red with co-stars Bruce Willis, Helen Mirren, and John Malkovich. Red is loosely adapted from the comic-book series Red, created by Warren Ellis and Cully Hamner and published by the DC Comics imprint Homage. Freeman plays CIA mentor Joe, who helps retired fellow agent Frank (Willis) to uncover some assassins. The film was a critical and commercial success; writing for Melbourne's The Age, Jim Schembri praised Freeman and the cast who "bring an infectious comic energy to their roles". Besides film, Freeman worked on other projects. In January 2010, he replaced Walter Cronkite as the voiceover introduction to the CBS Evening News presented by Katie Couric. CBS gave the need for consistency in introductions for regular news broadcasts and special reports as the basis for the change. Deborah Myers, head of Science Channel, approached Freeman to be the presenter of Through the Wormhole (2010–17). She had heard that he was "really interested in space and the universe", and the pair agreed to develop the series together. In 2011, Freeman narrated the fantasy Conan the Barbarian and appeared in the family drama Dolphin Tale, as prosthetic specialist Dr. McCarthy. Returning to theater in 2011, Freeman was featured with John Lithgow in the Broadway debut of Dustin Lance Black's play, 8, a staged reenactment of Perry v. Brown, the federal trial that overturned California's Proposition 8 ban on same-sex marriage. Freeman played Attorney David Boies.
Sources: en.wikipedia.org
Commission B1: Thermodynamics and Transfer Processes The objectives of Commission B1 on Thermodynamics and Transfer Processes are to provide academic and industrial information and data, and to propose any solutions on thermodynamics and transfer processes. The Commission B1 has been extremely active in IIR Working Groups, sub-commissions, IIR conferences, co-sponsored conferences, and commission business meetings. As well as being involved in IIR Working Groups on the mitigation of direct emissions of greenhouse gases in refrigeration, the commission is equally involved in the Working Group on Life Cycle Climate Performance (LCCP) Evaluation. Active in IIR conferences and congresses, Commission B1 similarly organises workshops in various fields such as refrigerant charge reduction in refrigerating systems. Initiatives and opportunities, such as the phase-down of high-GWP refrigerants, energy-efficient buildings and cars, transport refrigeration, food preservation, the economic importance of the refrigeration sector, the involvement of the younger generation and identifying industrial needs are all at the heart of Commission B1.
Spinoff is a NASA publication featuring technology made available to the public. Since 1976, NASA has featured an average of 50 technologies each year in the annual publication, and Spinoff maintains a searchable database of these technologies. When products first spun off from space research, NASA presented a black and white report in 1973, titled the "Technology Utilization Program Report". Because of interest in the reports, NASA decided to create the annual publications in color. Spinoff was first published in 1976, and since then, NASA has distributed free copies to universities, the media, inventors and the general public. Spinoff describes how NASA works with various industries and small businesses to bring new technology to the public. As of 2016, there were over 1,920 Spinoff products in the database dating back to 1976.
Tulips are called lale in Turkish (from the Persian: لاله, romanized: laleh from لال lal 'red'). When written in Arabic letters, lale has the same letters as Allah, which is why the flower became a holy symbol. It was also associated with the House of Osman, resulting in tulips being widely used in decorative motifs on tiles, mosques, fabrics, crockery, etc. in the Ottoman Empire. The tulip was seen as a symbol of abundance and indulgence. The era during which the Ottoman Empire was wealthiest is often called the Tulip era or Lale Devri in Turkish. Tulips became popular garden plants in the east and west, but, whereas the tulip in Turkish culture was a symbol of paradise on earth and had almost a divine status, in the Netherlands it represented the briefness of life. By contrast to other flowers such as the coneflower or lotus flower, tulips have historically been capable of genetically reinventing themselves to suit changes in aesthetic values. In his 1597 herbal, John Gerard says of the tulip that "nature seems to play more with this flower than with any other that I do know". When in the Netherlands, beauty was defined by marbled swirls of vivid contrasting colours, the petals of tulips were able to become "feathered" and "flamed". However, in the 19th century, when the English desired tulips for carpet bedding and massing, the tulips were able to once again accommodate this by evolving into "paint-filled boxes with the brightest, fattest dabs of pure pigment".
Sources: en.wikipedia.org
Nicotinamide mononucleotide is a nucleotide intermediate in the biosynthesis of NAD+. It consists of nicotinamide attached to a ribose phosphate unit. NMN occurs naturally in cells and is present at low levels in some foods.
NMN is a direct precursor in the NAD+ salvage pathway. Enzymes called NMNAT convert NMN into NAD+, a coenzyme used in metabolism and cell signaling. Raising NMN may increase NAD+ in some experimental settings, but the effect depends on tissue and organism.
No. Nicotinamide riboside is a related compound that lacks the phosphate group present in NMN. Cells can convert nicotinamide riboside into NMN, and both compounds feed into NAD+ production through overlapping routes.
NMN stands for nicotinamide mononucleotide. It is a nucleotide intermediate in the cellular pathway that produces NAD+, a coenzyme involved in energy metabolism and signaling. NMN is not the same compound as NAD+.