To browse Academia. Skip to main content. By using our site, you agree to our collection of information through the use of cookies. To learn more, view our Privacy Policy. Log In Sign Up. Add Social Profiles Facebook, Twitter, etc. Edward Dratz. Unfollow Follow Unblock. Other Affiliations:. Metabolomics and Proteomics. Clinical Sciences , Retrovirology , and Binding Site.
These subjects were instructed to adhere to their customary diet throughout the period of the study, and to These subjects were instructed to adhere to their customary diet throughout the period of the study, and to abstain from nutritional supplements during this Plasma alpha-tocopherol rose rapidly and fell at the same rate following cessation of supplementation with both forms of vitamin E.
No significant differences in plasma alpha- or gamma-tocopherol levels were found between the two forms of vitamin E following their administration. The results confirm the currently accepted biopotencies of 1.
Engineering and Medical and Health Sciences. The number of different fragmentation pathways increases with increase in temperature. In contrast, at K, there are 61 pathways, and not one dominates. The backbone and side-chain fragmentations occur by concerted reactions, with simultaneous proton transfer and bond rupture, and also by homolytic bond ruptures without proton transfer.
Use of human induced pluripotent stem cell-derived neurons as a model for Cerebral Toxoplasmosis more. In chronically infected individuals, the parasite resides primarily in cysts within neurons in the In chronically infected individuals, the parasite resides primarily in cysts within neurons in the central nervous system.
The chronic infection in immunocompetent individuals has been considered to be asymptomatic but increasing evidence indicates the chronic infection can lead to neuropsychiatric disorders such as Schizophrenia, prenatal depression and suicidal thoughts.
A better understanding of the mechanism s by which the parasite exerts effects on human behavior is limited due to lack of suitable human neuronal models.
This culture method resulted in a relatively pure monolayer of induced human neuronal-like cells that stained positive for neuronal markers, MAP Microbiology , Immunology , and Medical Microbiology.
Biochemistry and cell biology. Greatly enhanced sensitivity of near infrared light scattering as a probe of enzymatic processes in ROS membranes more.
Proton, carbon, and phosphorus NMR methods for the investigation of rhodopsin--lipid interactions in retinal rod outer segment membranes more.
Preparative high-performance liquid chromatography purification of polyunsaturated phospholipids and characterization using ultraviolet derivative spectroscopy more. Analytical Chemistry , Analytical Biochemistry , and Biochemistry and cell biology. Mapping discontinuous antibody or aptamer epitopes for protein structure determination and other applications more.
Publication Date: Jun 30, Purification of rat retinal rod outer segment membranes more. Zwitterionic dyes for labeling in proteomic and other biological analyses more.
Lipid peroxidation and retinal phototoxic degeneration more. Publication Name: Basic life sciences. NMR constrained solution structures for laminin peptide Analogs define structural requirements for inhibition of tumor cell invasion of basement membrane matrix more. A high affinity laminin receptor in tumor cells is thought to be blocked by the carboxyl-terminal YIGSR, and conformational energy calculations suggest A high affinity laminin receptor in tumor cells is thought to be blocked by the carboxyl-terminal YIGSR, and conformational energy calculations suggest that the glycine in YIGSR allows an important conformational bend.
Molecular dynamics generated low energy structures with excellent NOE agreement for peptide 11 and its analogs. Both peptide 11 and the D-Ala7 an Conversion of S-phenylsulfonylcysteine residues to mixed disulfides at pH 4. A three step protocol for protein S-nitrosothiol conversion to fluorescent mixed disulfides with purified proteins, referred to as the thiosulfonate switch, is explored which involves: 1 thiol blocking at pH 4.
Organic Chemistry and Pharmacology and pharmaceutical sciences. Circular dichroism spectra and the molecular arrangement of bacteriochlorophylls in the reaction centers of photosynthetic bacteria more. Multidisciplinary and Circular Dichroism.
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Allowing a website to create a cookie does not give that or any other site access to the rest of your computer, and only the site that created the cookie can read it. Pair your accounts. Your Mendeley pairing has expired. Please reconnect. Practise answering Olympiad-style questions with these past papers and mark schemes with answers.
How to use Chemistry Olympiad past papers Past papers can be used flexibly by teachers and students, with varying degrees of independence.
Additional support and resources Check out our Chemistry Olympiad support booklet for further guidance on the types of questions used in the competition, as well as example questions with commentary and analysis.
Build up to tackling a whole past paper using our series of worked answers , designed to help students less familiar with Olympiad-style questions develop the skills and confidence they need, one step at a time. Download all. Use Assessment Download. Category Exams Higher-order thinking and metacognition Problem solving Able and talented. Physical Chemistry Acids and Bases pH curves, titrations and indicators Students should be able to perform calculations for these titrations based on experimental results.
Students should be able to: calculate entropy changes from absolute entropy values. Rate equations Rate equations Perform calculations using the rate equation. Equilibrium constant Kp for homogeneous systems Perform calculations involving Kp. Atomic structure Mass number and isotopes Calculate relative atomic mass from isotopic abundance, limited to mononuclear ions.
Amount of substance Balanced equations and associated calculations Equations full and ionic. Students should be able to: write balanced equations for reactions studied. Balance equations for unfamiliar reactions when reactants and products are specified. Percentage yields. The mole and the Avogadro constant Students should be able to carry out calculations: using the Avogadro constant. Students should be able to use the equation in calculations Empirical and molecular formula Molecular formula is the actual number of atoms of each element in a compound.
Students should be able to: calculate empirical formula from data giving composition by mass or percentage by mass.
Bonding Shapes of simple molecules and ions Students should be able to explain the shapes of, and bond angles in, simple molecules and ions with up to six electron pairs including lone pairs of electrons surrounding the central atom.
Bond polarity Explain why some molecules with polar bonds do not have a permanent dipole. Chemical equilibria, Le Chatelier's principle and Kc Equilibrium constant Kc for homogeneous systems Students should be able to: construct an expression for Kc for a homogeneous system in equilibrium.
Oxidation, reduction and redox equations Oxidation is the process of electron loss and oxidising agents are electron acceptors.
Reduction is the process of electron gain and reducing agents are electron donors. The rules for assigning oxidation states Students should be able to: work out the oxidation state of an element in a compound or ion from the formula. Write half-equations identifying the oxidation and reduction processes in redox reactions. Combine half-equations to give an overall redox equation. Organic chemistry Introduction to organic chemistry Isomerism Draw the structural formulas of E and Z isomers.
Reaction mechanisms Free-radical mechanisms: the unpaired electron in a radical is represented by a dot the use of curly arrows is not required for radical mechanisms. Students should be able to write balanced equations for the steps in a free-radical mechanism. Addition polymers Draw the structure of the monomer from a section of the polymer. Alcohols Oxidation of alcohols Secondary alcohols can be oxidised to ketones.
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