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Materials Science Laboratory Experimental programs are being carried out on aluminium-nickel and aluminium-silicon alloys. Scientific research on the ISS
https://en.wikipedia.org/wiki?curid=23922461
Williams-Wright Award The is an award that honors extraordinary or outstanding work in spectroscopic measurements while working in an industrial setting. The award has been given by the Coblentz Society annually since 1978 with the Awardee being selected by a committee of leading spectroscopists. The Award citations re...
https://en.wikipedia.org/wiki?curid=23925668
Coblentz Society The is a non-profit American organization named after William Coblentz which is involved in the sponsorship of instructional materials, awards and recognitions enhancing the understanding of molecular (vibrational) spectroscopy. The organization was founded in 1954 and is a technical affiliate of the S...
https://en.wikipedia.org/wiki?curid=23926163
Massively parallel signature sequencing Massive parallel signature sequencing (MPSS) is a procedure that is used to identify and quantify mRNA transcripts, resulting in data similar to serial analysis of gene expression (SAGE), although it employs a series of biochemical and sequencing steps that are substantially diff...
https://en.wikipedia.org/wiki?curid=23929075
Massively parallel signature sequencing Each signature sequence is cloned onto one of a million microbeads. The technique ensures that only one type of DNA sequence is on a microbead. So if there are 50 copies of a specific transcript in the biological sample, these transcripts will be captured onto 50 different microb...
https://en.wikipedia.org/wiki?curid=23929075
Massively parallel signature sequencing Some of the disadvantages related to SAGE apply to MPSS as well, such as loss of certain transcripts due to lack of restriction enzyme recognition site and ambiguity in tag annotation. The high sensitivity and absolute gene expression certainly favors MPSS. However, the technolog...
https://en.wikipedia.org/wiki?curid=23929075
Intron-mediated enhancement (IME) is the ability of an intron sequence to enhance the expression of a gene containing that intron. In particular, the intron must be present in the transcribed region of the gene for enhancement to occur, differentiating IME from the action of typical transcriptional enhancers. Descripti...
https://en.wikipedia.org/wiki?curid=23937630
Intron-mediated enhancement In "Arabidopsis" and other plant species, the IMEter has been developed to calculate the likelihood that an intron sequence will enhance gene expression. It does this by calculating a score based on the patterns of nucleotide sequences within the target sequence. The position of an intron wi...
https://en.wikipedia.org/wiki?curid=23937630
ML 4.2-inch mortar The Ordnance was a heavy mortar used by the British Army during and after World War II. The 4.2-inch (107 mm) mortar was a smooth-bore weapon of the Stokes pattern and was designed by the Armaments Research and Development Establishment and produced by the Royal Ordnance Factories. It entered widespr...
https://en.wikipedia.org/wiki?curid=23941948
ML 4.2-inch mortar After World War II, the mortars were handed over to the Royal Artillery, the 170th Mortar Battery used them at the Battle of Imjin River in Korea. They were used during the 1950s, also by airborne artillery, deployed to Kuwait in 1961 and manned by soldiers from air defence batteries during the Confr...
https://en.wikipedia.org/wiki?curid=23941948
Methylnortestosterone may refer to:
https://en.wikipedia.org/wiki?curid=23951582
Methylbutanol may refer to:
https://en.wikipedia.org/wiki?curid=23953823
Chemical Vapor Deposition (journal) Chemical Vapor Deposition was a monthly peer-reviewed scientific journal covering materials science. It was established in 1995 and ceased independent publication in 2015, when it became a section of "Advanced Materials Interfaces". The journal was published by Wiley-VCH and the edit...
https://en.wikipedia.org/wiki?curid=23955137
Copy number analysis usually refers to the process of analyzing data produced by a test for DNA copy number variation in patient's sample. Such analysis helps detect chromosomal copy number variation that may cause or may increase risks of various critical disorders. Copy number variation can be detected with various t...
https://en.wikipedia.org/wiki?curid=23956168
Copy number analysis Usually, log-ratio measurements are produced by this technology to represent deviation of patient's copy number state from normal. Such measurements then are studied and those that significantly differ from zero value are announced to represent a part of a chromosome with an anomaly (an abnormal co...
https://en.wikipedia.org/wiki?curid=23956168
Macromolecular Rapid Communications is a biweekly peer-reviewed scientific journal covering polymer science. It publishes Communications, Feature Articles and Reviews on general polymer science, from chemistry and physics of polymers to polymers in materials science and life sciences. The journal was founded in 1979 as...
https://en.wikipedia.org/wiki?curid=23956198
Physics and Chemistry of Minerals is a peer-reviewed scientific journal published monthly by Springer Science+Business Media. The journal publishes articles and short communications on minerals or solids related to minerals and covers applications of modern techniques or new theories and models to interpret atomic stru...
https://en.wikipedia.org/wiki?curid=23956689
Belt filter The belt filter (sometimes called a belt press filter, or belt filter press) is an industrial machine, used for solid/liquid separation processes, particularly the dewatering of sludges in the chemical industry, mining and water treatment. presses are also used in the production of apple juice, cider and wi...
https://en.wikipedia.org/wiki?curid=23957650
Belt filter These wastes can include mixed sludge, mineral slurry, dust sediment, selected coal washing mud, biological sludge, primary sludge, and straw, wood or waste paper pulp. Some dewatering objectives include reducing the volume to reduce the transport and storage costs, removing liquids before landfill disposal...
https://en.wikipedia.org/wiki?curid=23957650
Belt filter The belt filter press is often used in wastewater treatment, and thus the odour of the feed sludge, volatile emissions and the chemicals used in treatment, may become a problem. One control method is to use odour-neutralizing chemicals such as potassium permanganate. However this only neutralizes odours and...
https://en.wikipedia.org/wiki?curid=23957650
Belt filter The belt filter needs to be washed frequently which consumes large amount of water and time. Water and time wastage, as well as the associated costs can be reduced by automating the washing system and using effluents. designs are crafted using manufacturer design and performance data, operating installation...
https://en.wikipedia.org/wiki?curid=23957650
Belt filter The pressure or wedge zones use two belts, upper and lower, to sandwich the feed together, but an independent gravity zone has its own separate belt, making the belt filter a three-belt system. Depending on the required conditions of the cake, belt filters can have added washing stages and, infrared, hot ga...
https://en.wikipedia.org/wiki?curid=23957650
Belt filter The resulting dewatered sludge (or cake) dry solids concentration typically falls in the range of 12-50%. Dilute feed solids concentration results in a cake of higher moisture content whilst a higher feed solids concentration yields an improved solids filtration rate and drier end product. The input to a be...
https://en.wikipedia.org/wiki?curid=23957650
Belt filter The degree of dewatering in the gravity drainage zone is greatly dependent on the type of solids, the filter media and the sludge conditioning. The dewatering achieved in the gravity drainage zone is adversely affected if the sludge is poorly spread across the belt or the residence time is insufficient. Slu...
https://en.wikipedia.org/wiki?curid=23957650
Belt filter In the compression zone of a belt press filter, the filter cake is compressed between the two belts and passed over rollers to exert pressure on the cake. There is an optimum number of rollers above which a drier product is not necessarily the result. Drier product is obtained from reduced belt speed rather...
https://en.wikipedia.org/wiki?curid=23957650
Belt filter The following correlation relates input mass flow rate to belt speed: formula_1 Where Q = mass flow rate (kg/s), m = mass loading (kg/m), s = belt speed (m/s) and L = initial width of sludge across the belt (m). Thus to maintain industrial scale economic throughput at lower belt speed, the mass loading and ...
https://en.wikipedia.org/wiki?curid=23957650
Belt filter Belt press filters in general have the lowest flocculant consumption for any of the listed processes excluding membrane filter presses and centrifuges. Increasing the feed solid concentration increases the solid filtration rate, minimises cake moisture content and produces a more homogeneous cake all of whi...
https://en.wikipedia.org/wiki?curid=23957650
Belt filter Both seamless and seamed belts are available. Seamed belts wear faster at the seam and cause wear at the rollers and the doctor blade. Zipper-type and clipper-type seamed belts are also available with the zipper-type having a longer life span as they provide less discontinuity. Seamless belts have the longe...
https://en.wikipedia.org/wiki?curid=23957650
Belt filter If the filter is downstream of a clarifier or thickener the filtrate (and wash water) can be recycled back into the clarifier to reduce the required filtrate clarity and allows for the use of more durable cloths. If recycling or reuse is not an option the filtrate should be discharged subject to legislation...
https://en.wikipedia.org/wiki?curid=23957650
Belt filter The three belt system is more efficient with both a higher production rate and cake solid concentration at the expense of mechanical complexity. The V-fold belt is similar to the belt filter press with the main difference being that only a single belt, folded along the centreline is used. The technology has...
https://en.wikipedia.org/wiki?curid=23957650
C9H10O2 The molecular formula CHO (molar mass: 150.18 g/mol, exact mass: 150.06808 u) may refer to:
https://en.wikipedia.org/wiki?curid=23958251
C9H10O3 The molecular formula CHO may refer to:
https://en.wikipedia.org/wiki?curid=23958260
C9H10O4 The molecular formula CHO (molar mass : 182.17 g/mol, exact mass : 182.05790878 u) may refer to:
https://en.wikipedia.org/wiki?curid=23958261
Multiangle light scattering (MALS) describes a technique for measuring the light scattered by a sample into a plurality of angles. It is used for determining both the absolute molar mass and the average size of molecules in solution, by detecting how they scatter light. Collimated light from a laser source is most ofte...
https://en.wikipedia.org/wiki?curid=23959374
Multiangle light scattering The measurement of scattered light from an illuminated sample forms the basis of the so-called classical light scattering measurement. Historically, such measurements were made using a single detector rotated in an arc about the illuminated sample. The first commercial instrument (formally c...
https://en.wikipedia.org/wiki?curid=23959374
Multiangle light scattering The then-conventional use of a single detector rotated about an illuminated sample with intensities collected at specific angles was called "differential light scattering" after the quantum mechanical term "differential cross section", "σ(θ)" expressed in milli-barns/steradian. Differential ...
https://en.wikipedia.org/wiki?curid=23959374
Multiangle light scattering Another required element is an optical cell to hold the sample being measured. Alternatively, cells incorporating means to permit measurement of flowing samples may be employed. If single-particles scattering properties are to be measured, a means to introduce such particles one-at-a-time th...
https://en.wikipedia.org/wiki?curid=23959374
Multiangle light scattering The two terms thus refer to the same concept. For differential light scattering measurements, the light scattering photometer has a single detector whereas the MALS light scattering photometer generally has a plurality of detectors. Another type of MALS device was developed in 1974 by Salzma...
https://en.wikipedia.org/wiki?curid=23959374
Multiangle light scattering Johnson and Son, by Wyatt Technology Company, in 1983, followed in 1984 with the sale of the first 15 detector flow instrument (Dawn-F) to AMOCO. By 1988, a three-dimensional configuration was introduced specifically to measure the scattering properties of single aerosol particles. At about ...
https://en.wikipedia.org/wiki?curid=23959374
Multiangle light scattering This type of scattering is responsible for the blue color of the sky during the day and is inversely proportional to the fourth power of wavelength. The Rayleigh–Gans approximation is a means of interpreting MALS measurements with the assumption that the scattering particles have a refractiv...
https://en.wikipedia.org/wiki?curid=23959374
Multiangle light scattering The scattering volume "ΔV" from which scattered light reaches the detector is determined by the detector’s field of view generally restricted by apertures, lenses and stops. Consider now a MALS measurement made in a plane from a suspension of N identical particles/molecules per ml illuminate...
https://en.wikipedia.org/wiki?curid=23959374
Multiangle light scattering Zimm in his paper “Apparatus and Methods for Measurement and Interpretation of the Angular Variation of Light Scattering; Preliminary Results on Polystyrene Solutions” involved utilizing a single detector rotated about a sample contained within a transparent vessel. MALS measurements from no...
https://en.wikipedia.org/wiki?curid=23959374
Multiangle light scattering These flow mode MALS measurements have been extended to other separation techniques such as field flow fractionation, ion exchange chromatography, and reversed-phase chromatography. The angular dependence of light scattering data is shown below in a figure of mix of polystyrene spheres which...
https://en.wikipedia.org/wiki?curid=23959374
Multiangle light scattering The branching ratio of a polymer relates to the number of branch units in a randomly branched polymer and the number of arms in star-branched polymers and was defined by Zimm and Stockmayer as formula_10 Where formula_11 is the mean square radius of branched and linear macromolecules with id...
https://en.wikipedia.org/wiki?curid=23959374
Strychnine total synthesis in chemistry describes the total synthesis of the complex biomolecule strychnine. The first reported method by the group of Robert Burns Woodward in 1954 is considered a classic in this research field. At the time it formed the natural conclusion to an elaborate process of molecular structure...
https://en.wikipedia.org/wiki?curid=23960205
Strychnine total synthesis In his 1963 publication Woodward quoted Sir Robert Robinson who said "for its molecular size it is the most complex substance known". The CHNO strychnine molecule contains 7 rings including an indoline system. It has a tertiary amine group, an amide, an alkene and an ether group. The naturall...
https://en.wikipedia.org/wiki?curid=23960205
Strychnine total synthesis Finally the newly formed double bond was reduced by sodium borohydride to indoline 9 with the C8 hydrogen atom approaching from the least hindered side (this proton is removed later on in the sequence and is of no importance). Indoline 9 was acetylated to N-acetyl compound 10 (acetic anhydrid...
https://en.wikipedia.org/wiki?curid=23960205
Strychnine total synthesis This particular compound was already known from strychnine degradation studies. Until now all intermediates were racemic but chirality was introduced at this particular stage via chiral resolution using quinidine. The C20 carbon atom was then introduced by acetic anhydride to form enol acetat...
https://en.wikipedia.org/wiki?curid=23960205
Strychnine total synthesis The Overman synthesis (1993) took a chiral cyclopentene compound as starting material obtained by enzymatic hydrolysis of "cis"-1,4-diacetoxycyclopent-2-ene. This starting material was converted in several steps to trialkylstannane 2 which was then coupled with an aryl iodide 1 in a Stille re...
https://en.wikipedia.org/wiki?curid=23960205
Strychnine total synthesis Starting compounds tryptamine 1 and 4,4-dimethoxy acrolein 2 were reacted together with boron trifluoride to acetal 3 as a single diastereomer in an amine-carbonyl condensation / sigmatropic rearrangement sequence. Hydrolysis with perchloric acid afforded aldehyde 4. A Johnson–Corey–Chaykovsk...
https://en.wikipedia.org/wiki?curid=23960205
Strychnine total synthesis In the 1998 Keuhne synthesis of chiral (−)-strychnine the starting material was derived from chiral tryptophan. In the Rawal synthesis (1994, racemic) amine 1 and enone 2 were combined in an amine-carbonyl condensation followed by methyl chloroformate quench to triene 3 which was then reacted...
https://en.wikipedia.org/wiki?curid=23960205
Strychnine total synthesis Reaction with zinc dust in 10% sulfuric acid removed the TBDMS protective group, reduced the nitro group and brought about a reductive amino-carbonyl cyclization in a single step to tetracyclic 6 (epimeric mixture). In the final step to the Wieland-Gumlich aldehyde 7 reaction with NaH in MeOH...
https://en.wikipedia.org/wiki?curid=23960205
Strychnine total synthesis Desilylation of the TBDMS group next took place by HCl to the hydroxide and then to the nitrile 4 (NaCN) through the bromide (PBr). Heck reaction (Pd(OAc) / MePPh) and debromination (AgCO) afforded tricycle 5. LiALH Nitrile reduction to the amine and its BocO protection to boc amine 6 was the...
https://en.wikipedia.org/wiki?curid=23960205
Strychnine total synthesis A C2 fragment was added as Weinreb amide 5 to form PMB ether 6 using LDA. The ketone was then reduced to the alcohol (NaBHCN, TiCl) and then water was eliminated (DCC, CuCl) to form alkene 7. After ester reduction (DIBAL) to the alcohol and its TIPS protection (TIPSOTf, triethylamine), the ac...
https://en.wikipedia.org/wiki?curid=23960205
Strychnine total synthesis The alcohol was oxidized to the aldehyde using a Parikh-Doering oxidation and TIPS group removal gave hemiacetal 19 called (+)-diaboline which is acylated Wieland-Gumlich aldehyde. The synthesis reported by Bodwell/Li (racemic, 2002) was a formal synthesis as it produced a compound already pr...
https://en.wikipedia.org/wiki?curid=23960205
Strychnine total synthesis In this method indole 1 was converted to tetracycle 2 (together with by-product) in a single cascade reaction using samarium diiodide and HMPA. Raney nickel/ H reduction gave amine 3 and a one-pot reaction using methyl chloroformate, DMAP and TEA then MsCl, DMAP and TEA and then DBU gave Rawa...
https://en.wikipedia.org/wiki?curid=23960205
Applied element method The applied element method (AEM) is a numerical analysis used in predicting the continuum and discrete behavior of structures. The modeling method in AEM adopts the concept of discrete cracking allowing it to automatically track structural collapse behavior passing through all stages of loading: ...
https://en.wikipedia.org/wiki?curid=23960842
Applied element method The elements are then connected through a set of normal and shear springs located at contact points distributed along the element faces. Normal and shear springs are responsible for the transfer of normal and shear stresses from one element to the next. The modeling of objects in AEM is very simi...
https://en.wikipedia.org/wiki?curid=23960842
Applied element method In AEM three contact methods include Corner-to-Face, Edge-to-Edge, and Corner-to-Ground. The spring stiffness in a 2D model can be calculated from the following equations: Where "d" is the distance between springs, "T" is the thickness of the element, "a" is the length of the representative area,...
https://en.wikipedia.org/wiki?curid=23960842
Applied element method The 2D element stiffness matrix size is 6 × 6; the components of the upper left quarter of the stiffness matrix are shown below: The stiffness matrix depends on the contact spring stiffness and the spring location. The stiffness matrix is for only one pair of contact springs. However, the global ...
https://en.wikipedia.org/wiki?curid=23960842
European chemical Substances Information System The (ESIS) was a chemoinformatics database that stored information system on chemicals of the European Union. It was created by the former European Chemicals Bureau, which completed its mandate in 2008, in the year 2003. ESIS was set up by the Joint Research Centre of the...
https://en.wikipedia.org/wiki?curid=23962835
PRO/II It includes a chemical component library, thermodynamic property prediction methods, and unit operations such as distillation columns, heat exchangers, compressors, and reactors as found in the chemical processing industries. It can perform steady state mass and energy balance calculations for modeling continuou...
https://en.wikipedia.org/wiki?curid=23967049
Kintech Lab is a software company headquartered in Russia. It provides computer simulation software in the areas of combustion, energy sources, photonics, microelectronics, nanotechnology. Also is the R & D company performing scientific research projects in the above-mentioned areas. <br> was established in 1998 by a g...
https://en.wikipedia.org/wiki?curid=23967222
Kintech Lab This approach implies an a priori simulation of the materials and processes based on the detailed understanding of structure and mechanism on the atomic level. In the frame of this approach simulation precedes the prototype creation allowing to significantly decreasing of the amount of the experimental test...
https://en.wikipedia.org/wiki?curid=23967222
Advanced Engineering Materials publishes peer-reviewed reviews, communications, and full papers, on topics centered around structural materials, such as metals, alloys, ceramics, composites, plastics etc..
https://en.wikipedia.org/wiki?curid=23967264
Laser-induced incandescence (LII) is a non-intrusive method of measuring time-resolved soot particle volume fraction and primary particle sizes in flames.
https://en.wikipedia.org/wiki?curid=23970820
C7H7Cl The molecular formula CHCl may refer to:
https://en.wikipedia.org/wiki?curid=23974457
C7H10N2O2S The molecular formula CHNOS may refer to:
https://en.wikipedia.org/wiki?curid=23974496
C9H13NO2 The molecular formula CHNO (molar mass: 167.20 g/mol, exact mass: 167.094629) may refer to:
https://en.wikipedia.org/wiki?curid=23974560
C10H14O2 The molecular formula CHO may refer to:
https://en.wikipedia.org/wiki?curid=23974654
C10H20O2 The molecular formula CHO may refer to:
https://en.wikipedia.org/wiki?curid=23974724
C10H21N The molecular formula CHN may refer to:
https://en.wikipedia.org/wiki?curid=23974743
C11H16N2O3 CHNO may refer to:
https://en.wikipedia.org/wiki?curid=23974854
C11H17N The molecular formula CHN (molar mass : 163.25 g/mol, exact mass : 163.1361) may refer to:
https://en.wikipedia.org/wiki?curid=23974874
C11H17NO The molecular formula CHNO (molar mass : 179.25 g/mol, exact mass : 179.131014) may refer to:
https://en.wikipedia.org/wiki?curid=23974899
KME Group The is one of the world's largest copper producers. It was formed from the merging of several copper producers: Kabelmetal AG in Osnabrück (formerly called OKD - Osnabrücker Kupfer und Drahtwerke), Stolberger Metallwerke, Tréfimétaux SA in France, and Europa Metalli. The Group is under the majority ownership ...
https://en.wikipedia.org/wiki?curid=23974918
C12H13N3O2 The molecular formula CHNO (molar mass : 231.25 g/mol) may refer to:
https://en.wikipedia.org/wiki?curid=23974951
C12H14N2O2 The molecular formula CHNO (molar mass : 218.25 g/mol, exact mass : 218.105528) may refer to:
https://en.wikipedia.org/wiki?curid=23974973
C12H14N4O2S The molecular formula CHNOS may refer to:
https://en.wikipedia.org/wiki?curid=23974986
C12H14O4 The molecular formula CHO (molar mass : 222.23 g/mol) may refer to:
https://en.wikipedia.org/wiki?curid=23975003
C12H16N2O3 The molecular formula CHNO may refer to:
https://en.wikipedia.org/wiki?curid=23975092
C12H18N2O3 The molecular formula CHNO may refer to:
https://en.wikipedia.org/wiki?curid=23975107
C12H19NO The molecular formula CHNO (molar mass : 193.28 g/mol, exact mass : 193.146664) may refer to:
https://en.wikipedia.org/wiki?curid=23975123
Blast damper A blast damper is used to protect occupants and equipment of a structure against overpressures resultant of an explosion. The blast dampers normally protect air inlets and exhaust penetrations in an otherwise hardened structure. Blast dampers are related or identical to blast valves, the latter name is gen...
https://en.wikipedia.org/wiki?curid=23979335
Torrefaction of biomass, e.g., wood or grain, is a mild form of pyrolysis at temperatures typically between 200 and 320 °C. changes biomass properties to provide a better fuel quality for combustion and gasification applications. produces a relatively dry product, which reduces or eliminates its potential for organic d...
https://en.wikipedia.org/wiki?curid=23979425
Torrefaction The final product is the remaining solid, dry, blackened material that is referred to as "torrefied biomass" or "bio-coal". During the process, the biomass typically loses 20% of its mass (bone dry basis) and 10% of its heating value, with no appreciable change in volume. This energy (the volatiles) can be...
https://en.wikipedia.org/wiki?curid=23979425
Torrefaction Wood powder fuel: Large-scale co-firing in coal-fired power plants: Steel production: Residential/decentralized heating: Biomass-to-Liquids: Miscellaneous uses:
https://en.wikipedia.org/wiki?curid=23979425
C13H10O The molecular formula CHO may refer to:
https://en.wikipedia.org/wiki?curid=23979786
C14H10O4 The molecular formula CHO may refer to:
https://en.wikipedia.org/wiki?curid=23979843
C14H14O3 The molecular formula CHO (molar mass : 230.25 g/mol, exact mass: 230.094294 u) may refer to:
https://en.wikipedia.org/wiki?curid=23979930
C14H18N2O3 The molecular formula CHNO (molar mass : 262.30 g/mol) may refer to:
https://en.wikipedia.org/wiki?curid=23979944
C14H19N3S The molecular formula CHNS may refer to:
https://en.wikipedia.org/wiki?curid=23979965
C14H20ClNO2 CHClNO is a molecular formula and (molar mass : 269.76 g/mol) may refer to:
https://en.wikipedia.org/wiki?curid=23979977
C14H21NO2 The molecular formula CHNO may refer to:
https://en.wikipedia.org/wiki?curid=23979994
C15H10O2 The molecular formula CHO (molar mass : 222.23 g/mol, exact mass : 222.06807954) may refer to:
https://en.wikipedia.org/wiki?curid=23980027
C15H11ClN2O The molecular formula CHClNO may refer to:
https://en.wikipedia.org/wiki?curid=23980050
C15H12N2O The molecular formula CHNO may refer to:
https://en.wikipedia.org/wiki?curid=23980070
C15H21NO2 The molecular formula CHNO may refer to:
https://en.wikipedia.org/wiki?curid=23980088
C16H13ClN2O2 The molecular formula CHClNO (molar mass : 300.74 g/mol) may refer to:
https://en.wikipedia.org/wiki?curid=23980304
C16H19N3S The molecular formula CHNS may refer to:
https://en.wikipedia.org/wiki?curid=23980321