Stefan T. Orszulik

ORCID: 0000-0003-3176-4911
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About
Contact & Profiles
Research Areas
  • Lubricants and Their Additives
  • Enzyme Catalysis and Immobilization
  • Inorganic and Organometallic Chemistry
  • Synthetic Organic Chemistry Methods
  • Bacterial Identification and Susceptibility Testing
  • Tribology and Wear Analysis
  • Microbial Metabolic Engineering and Bioproduction
  • Asymmetric Synthesis and Catalysis
  • Chemical Synthesis and Reactions
  • Lipid metabolism and biosynthesis
  • Marine Toxins and Detection Methods
  • Polymer Nanocomposites and Properties
  • Image Processing and 3D Reconstruction
  • Organic Chemistry Cycloaddition Reactions
  • Photopolymerization techniques and applications
  • Synthesis and characterization of novel inorganic/organometallic compounds
  • Coordination Chemistry and Organometallics
  • Tribology and Lubrication Engineering
  • Antibiotics Pharmacokinetics and Efficacy
  • Global Energy and Sustainability Research
  • Leaf Properties and Growth Measurement
  • Axial and Atropisomeric Chirality Synthesis
  • Fatty Acid Research and Health
  • Spectroscopy and Chemometric Analyses
  • Synthesis and Biological Activity

De La Rue (United Kingdom)
2020-2024

Wantage Community Hospital
2023

Springer Nature (Germany)
2009

Castrol (United Kingdom)
1992-1994

Tun Abdul Razak Research Centre
1986-1990

Royal Holloway University of London
1979-1982

Abstract Developing a geometric formulation of any biological object has number justifications and applications. Recently, we developed universal figure for describing bird's egg in the possible basic shapes: spherical, ellipsoidal, ovoid, pyriform. The proved widely applicable but had drawbacks, including very obvious join between two parts egg. To correct this, Main Axiom mathematical formula. This essentially involved making ordinate extremum function correspond to half maximum breadth (...

10.1111/nyas.15059 article EN Annals of the New York Academy of Sciences 2023-08-29

α-Hydroxyalkylcyclopropanes are oxidised by nicotinamide-dependent horse liver alcohol dehydrogenase without cleavage of the 3-membered ring, implying that radical intermediates improbable in these reactions.

10.1039/c39820000121 article EN Journal of the Chemical Society Chemical Communications 1982-01-01

The oxidation of exo-bicyclo[4.1.0]heptan-7-ylmethanol and bicyclo[4.1.0]heptan-2-ol the reduction corresponding carbonyl compounds by horse liver alcohol dehydrogenase (E.C.1.1.1.1) occur without cleavage three-membered ring. Reactions these substrates with hydride donating abstracting reagents also proceed retention small ring whereas radical reactions lead to cyclopropane These results, together kinetic studies on rates opening cyclopropylmethyl silyl ethers e.s.r. spectroscopy suggest...

10.1039/p19830002777 article EN Journal of the Chemical Society. Perkin transactions I/Journal of the Chemical Society. Perkin transactions. I 1983-01-01

This article describes a method of curve-fitting that involves splitting the curve into two (or more) and creating separate functions for each part. These are then concatenated via linking function to create one overall better original data than is otherwise achievable. The able do this by separating so they active in only relevant portion without use dummy variables. final result continuous which it straightforward smooth transition at knot between piecewise subfunctions. In addition,...

10.1080/03610918.2022.2067871 article EN Communications in Statistics - Simulation and Computation 2022-04-28

A series of monocyclic and bicyclic cyclopropylmethanols typified by bicyclo[4.1.0]heptan-7-ylmethanol is shown to comprise latent irreversible inhibitors horse liver alcohol dehydrogenase (E.C.1.1.1.1) with inhibitory properties related the ability inhibitor bind enzyme. The time course inhibition biphasic, a property shared number unsaturated aldehydes, ketones, alcohols. Kinetic studies also suggest that occurs most effectively during removal hydride from as oxidation takes place....

10.1039/p19830002771 article EN Journal of the Chemical Society. Perkin transactions I/Journal of the Chemical Society. Perkin transactions. I 1983-01-01

Abstract Formaldehyde undergoes ethylaluminum dichloride‐catalyzed ene reaction with jojoba oil to afford a mixture of 1∶1 and 1∶2 adducts. The hydroxymethyl products were identified by comparison model adducts prepared from methyl oleate oleyl acetate.

10.1007/bf02541563 article EN Journal of the American Oil Chemists Society 1994-02-01

10.1016/s0040-4039(00)83879-4 article EN Tetrahedron Letters 1986-01-01

10.1016/j.diagmicrobio.2024.116237 article EN Diagnostic Microbiology and Infectious Disease 2024-02-27

Reduction of cyclopropaneglyoxylic acid by lactate dehydrogenase and model systems for both alcohol dehydrogenases occurs without cleavage the three-membered ring implying that radical intermediates are improbable in these reactions.

10.1039/c39820001146 article EN Journal of the Chemical Society Chemical Communications 1982-01-01

10.1016/j.mimet.2022.106538 article EN Journal of Microbiological Methods 2022-07-23
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