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    Search term:"reductions"

    536 matches found for reductions

    Synthesis and Characterization of threo Ritalinic Acid D10 Hydrochloride

    As a major metabolite of methylphenidate (1, Ritalin), ±-threo-Ritalinic acid (2) is of clinical relevance. To this end ±-threo-ritalinic acid-D10 HCl (3) was synthesized in seven steps with a purity of 99% and an isotopic purity ratio of D0/D10 = 0% and a significant amount of the D9-D7 isomers. Be...

    Bicinchoninic Acid Kit for Protein Determination (BCA protein assay) for 200- 1000 mg/ ml protein

    Protein Determination is one of the most common operations performed in biochemical research. The principle of the bicinchoninic acid (BCA) assay is similar to the Lowry procedure, in that both rely on the formation of a Cu2+-protein complex under alkaline conditions, followed by reduction of the Cu...

    Hematology & histology Learning Center article "Fatty Tissue" at Sigma-Aldrich.

    Mary Faith Abbuhl, MS HTL(ASCP)QIHC Andrea Williams, HT(ASCP) University Hospitals of Cleveland Cleveland, OH Mary.Abbuhl@uhhs.com This article has been reprinted with permission from HistoLogic, vol 38 no. 1, 2005. Abstract The microwave oven has been in use in the histology laboratory for many yea...

    Reference Books

    Vol. 2, No. 1 Products for Suzuki Coupling Download PDF (1.03 MB) Introduction / Boronic Acids / Boronic Acids Esters / Diboron Esters / Prolines & Pyroglutamates Transition-Metal Catalysts / Palladium Scavengers / Large-Scale Suzuki Coupling / Reference Books Reference Books Organic Syntheses via B...

    Irvine Dry Powder Media Facility — Validation Harmonisation

    Introduction Facility Design Overview Validation Approach Equipment Qualification Process Validation Case Study Cleaning Validation Critical Utilities Room Classifications and Environmental Conditions Ongoing Compliance Contingency Planning Further Information Abbreviations Contributors View the PDF...

    FluoroProfile Kit

    Shed new light on your protein quantification. FluoroProfile™ (Product No. FP0010) is significantly more sensitive than existing colorimetric methods, and exhibits a larger linear dynamic range than other fluorometric methods. Results are achieved in 20 minutes and reversible binding of the fluoroph...

    ±threo-Ritalinic acid-D10 Hydrochloride an internal standard for quantitation of Ritalinic acid by LCMSMS: Synthesis determination of isotopic distribution by qNMR and LCMS

    As a major metabolite of methylphenidate (1, Ritalin), ±-threo-Ritalinic acid2 is of clinical relevance. To this end ±-threo-ritalinic acid-D10HCl3 was synthesized in seven steps with a purity of 99% and an isotopic purity ratio of D0/D10= 0% and a significant amount of the D9-D7 isomers. Because pr...

    Direct Arylation of Heterocycles

    Lewis and co-workers have recently disclosed a highly functional-group compatible Rh-catalyzed C-H bond activation for the rapid synthesis of functionalized heterocycles. The method relies on the use of rhodium complexed with (Z)-1-tert-butyl-2,3,6,7-tetrahydrophosphepine, which behaves as a chelati...

    Gaining Process Efficiencies in Vaccine Production While Maintaining Regulatory Compliance

    Introduction The Challenge The Solution Results View the PDF Implementing lean manufacturing practices in the vaccine industry can exert positive impact on manufacturing processes. Traditionally, vaccine manufacturers have accepted a certain level of inefficiencies in manufacturing operations, howev...

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    HumanKine® Thermostable bFGF

    Introduction Methods – Determining stability of bFGF cytokines at elevated temperatures – Culture of human iPS cells – Expansion of ENStem™-A human neural progenitors Results Discussion Materials Fibroblast growth factors (FGFs) are secreted glycoproteins that regulate several fundamental developmen...

    Polyelectrolyte Multilayer Films and Membrane Functionalization

    • • Download PDF • Merlin L. Bruening Maneesha Adusumilli Department of Chemistry, Michigan State University East Lansing, MI 48824 Email: bruening@chemistry.msu.edu Among the many methods for preparing thin films, layer-by-layer (LbL) deposition of complementary polymers has emerged as an especiall...

    SupelMIP® Literature & References

    Title Molecularly Imprinted Polymer Overview SupelMIP SPE Brochure (981 Kb PDF) The Selective Extraction of Chloramphenicol using Molecularly Imprinted Polymer SPE, Shimelis O, Trinh A, Brandes H, US Supelco Reporter, 25.1 (482 Kb PDF) Analysis of analytes - The use of MIPs in solid-phase extraction...

    Greener Alternatives Evaluation Matrix

    Our approach to evaluating greener chemicals is based on the 12 Principles of Green Chemistry. We recognize that these principles distill into three major categories: improving resource use, more efficient use of energy, and minimizing human and environmental hazards. At present, we are not incorpor...

    Online Enzyme Quiz Answers

    Your answers were submitted successfully. You have completed our Online Enzyme Quiz! Look out for your confirmation email over the next few days. See below for quiz answers. Return to mainpage. 1. There are a large number of proteases offered among Sigma’s protein products. Which protease is extract...

    Multiplex Real-Time PCR

    Multiplex qPCR employing probe-based chemistries is a demanding application that often requires extensive optimization and validation. The combination of the multi-channel Eppendorf® Mastercycler® ep realplex4 S realtime PCR cycler and KAPA PROBE FAST qPCR Kits from Kapa Biosystems provides an indus...

    Dry Powder Media Global Supply

    SAFC Overview Why Choose SAFC? Media Supply Strategy DPM Manufacturing Capability and Capacity Packaging and Logistics Global Quality Systems Raw Materials Scale-up & Support Services Small Volume Custom Media – imMEDIAte Advantage™ Erythropoietin Hormone (Molecular model) Erythropoietin (EPO) is a ...

    Ginseng (Panax ginseng) | Plant Profiler

    Synonyms / Common Names / Related Terms Ginseng (American ginseng, Asian ginseng, Chinese ginseng, Korean red ginseng, Panax ginseng:Panaxspp., includingP. ginsengC.C. Meyer andP. quinquefoliusL., excludingEleutherococcus senticosus), Acetylenic alcohol, acidic polysaccharides, acupuncture-moxibusti...

    Glycine Hydrochloride for Cell Culture

    • • Download PDF • PharmaGrade, manufactured under appropriate controls for use as a raw material in pharma or biopharmaceutical production. Suitable for cell culture. • Product Regulatory Datasheet • Cherokee Buffers Quality Overview • Cherokee Buffers Site and Supply Chain Security Overview 1. Gen...

    Differentiation of Escherichia coli from coliforms

    Product Manager Microbiology In August 2008, the discovery of E. coli-contaminated beef in the United States prompted a nationwide recall of beef. The source turned out to be one supplier that had a history of contamination of its beef products. The usual sources of E. coli in beef are faeces-contam...

    Nanostructured Materials Through Ultrasonic Spray Pyrolysis

    Related Articles • A Review of Mesoprous TiO2 Thin Film • Synthesis of Melting Gels using Mono-Substituted and Di-Substituted Alkoxysiloxanes • Advanced Inorganic Materials for Solid State Lighting • Materials for Energy Efficiency (4.18 Mb PDF) • Nanoscale Surface Modification (3.24 Mb PDF) • Organ...

    Biodegradable Polyester Based Nanoparticle Formation by Miniemulsion Technique

    Aliphatic polyesters such as polylactide, poly(lactide-co-glycolide) and polycaprolactone, as well as their copolymers, represent a diverse family of synthetic biodegradable polymers that have been widely explored for medical uses and are commercially available.1 These polyesters have excellent tiss...

    Azide Building Blocks for Chemical Ligation

    Aldrich ChemFiles 2010, 10.2, 6. Dr. Matthias Junkers Dr. Matthias Junkers Product Manager Email: matthias.junkers@sial.com Chemoselective ligation strategies are a key success factor for chemical biology research. Ligation techniques open pathways to fully synthetic large peptides and even proteins...

    Enhanced Separation Capability in SIC using a Fused-Core® Column

    Enhanced Separation Capability in Sequential Injection Chromatography using an Ascentis® Express Column Based on Fused-Core® Particle Technology The following was generated with the assistance of an outside source using Sigma-Aldrich products. Technical content was generated and provided by: Petr Ch...

    Oxidizing and Reducing Agents

    • • Download PDF • Oxidation and reduction reactions are some of the most common transformations encountered in organic synthesis, and are some of the organic chemist’s most powerful tools for creating novel products. Below is a list of the most commonly used oxidizing and reducing agents currently ...

    Lightweight Metal Matrix Nanocomposites - Stretching the Boundaries of Metals

    • • Download PDF • Prof. P. K. Rohatgi B. Schultz Prof. P. K. Rohatgi and B. Schultz University of Wisconsin–Milwaukee Composite materials that traditionally incorporate micron scale reinforcements in a bulk matrix offer opportunities to tailor material properties such as hardness, tensile strength,...

    GC Analysis of Glycols and Diols

    • • Download PDF • mike.buchanan@sial.com Glycol and diol compounds are used to solubilize active ingredients for use in many consumer products, including cosmetics, ballpoint pen inks, wood stains, and lacquers. They are also used as co-monomers in polymerization reactions to form polyesters and po...

    Alternative Energy Tutorial

    Introduction Batteries Fuel Cells Conducting Polymers High-Purity Inorganics Liquid Electrolytes Plasticizers and Binders Solid Polymeric Electrolytes References Fuel cells and batteries are electrochemical cells used to generate an external electrical current. They consist of an anode, where oxidat...

    Email Carts & Consolidation - Benefit from a workflow model that supports groups buying!

    Send Purchasing Needs Electronically Sigma-Aldrich® makes your process easier. Benefit from a workflow model that supports group buying! Benefits for Users Email your shopping cart to an authorized purchaser • No more time spent editing spreadsheets • Items are remembered for future purchases • Shar...

    IPNBSH in Chemical Synthesis

    A Reagent for the Simple Reduction of Alcohols Introduction Developed by the Movassaghi group at MIT, N-isopropylidene-N’-2-nitrobenzenesulfonyl hydrazine (IPNBSH, 687855) is a useful reagent for the mild deoxygenation of allylic, propargylic, and aliphatic alcohols to the corresponding alkenes, all...

    Dietary Antioxidants

    Antioxidants protect biological systems from oxidative damage produced by oxygen-containing free radicals and from redoxactive transition metal ions such as iron, copper, and cadmium.1 During the oxidative metabolism of glucose in the mitochondria, superoxide anions (O2 –) are produced as a by-produ...