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1. Adduct - general term for a compound resulting from the direct
- orac.sunderland.ac.uk
- Adduct - general term for a compound resulting from the direct combination of two or more different compounds. ...
2. New Page 1
- broyde.nyu.edu
- The primary product of the reaction of (+)-anti-BPDE with DNA, the (+)-trans-anti-benzo a pyrene diol epoxide-N2-dG ((+)-ta BP G) adduct, is the most mutagenic BP adduct in mammalian systems and primarily causes G to T transversion mutations, resulting from the mismatch of adenine with the BP damaged guanine during replication. ... To gain structural insights into the effects of the bulky adduct on nucleotide incorporation within the polymerase active site, molecular modeling and molecular dynamics simulations were carried out using T7 DNA polymerase to permit the relation of function to structure. We modeled the (+)-trans-anti- BP -N2-dG adduct opposite incoming dGTP, dTTP and dCTP nucleotides, as well as unmodified guanine opposite its normal partner dCTP as a control, to compare with our previous simulation with dATP opposite the adduct. The modeling required that the (+)-trans-anti- BP -N2-dG adduct adopt the syn conformation in each case to avoid deranging essential protein/DNA interactions. While the dATP: (+)-trans-anti- BP -N2-dG pair was well accommodated within the active site of T7 DNA polymerase, dCTP fit poorly opposite the adduct, adopting an orientation perpendicular to the plane of the syn modified guanine during the simulation. ... The dATP nucleotide is most stably accommodated opposite the adduct, with protein-DNA hydrogen bonding interactions and an active site pocket size that do not deviate significantly from those of the control simulation. ... The dCTP: (+)-trans-anti- BP -N2-dG system had the least number of stabilizing interactions, and the active site pocket of this system increased in size significantly compared to the control and other dNTPs opposite the adduct. These simulations elucidated why A is inserted opposite (+)-trans-anti- BP -N2-dG most frequently, while T and G are inserted opposite the adduct to an extent intermediate between A and C, and C is most rarely incorporated in primer-extension studies. Structural rationalization of the incorporation preference opposite (+)-trans-anti- BP -N2-dG by T7 DNA polymerase contributes to providing a molecular explanation for mutations caused by this carcinogen-DNA adduct in a model system.
- (2003) Extending the Understanding of Mutagenicity: Structural Insights into Primer-extension Past a Benzo a pyrene Diol Epoxide-DNA Adduct. ...
- (2001) Base Sequence Dependence of Bending Induced by a Bulky Carcinogen-DNA Adduct: Experimental and Computational Analysis. ...
3. 721.4590 Mannich-based adduct.
- www.cleanerworld.com
- 4590 Mannich-based adduct. ...
- (1) The chemical substance generically identified as a Mannich-based adduct (PMN P-93-66) is subject to reporting under this section for the significant new uses described in paragraph (a)(2) of this section. ...
4. NSP 120 - NSF 61 Potable water approved Epoxy Adduct
- www.epoxyproducts.com
- NSP 120 - NSF 61 Potable Water approved Epoxy Adduct.
- A solvent free, non-hazmat (can be air shipped anywhere without restriction) epoxy adduct with NSF 61 pottable water approval. ...
- Adduct epoxies are two part epoxies but the curing agent actually contains a bit of the epoxy resin. ...
- HIGHEST QUALITY "A GRADE" MAINTENANCE AND BARRIER COATING --- TOP PERFORMANCE PREMIUM GRADE CYCLOALIPHATIC BASED CURING SYSTEM EPOXY ADDUCT FOR THE MOST DEMANDING APPLICATIONS INCLUDING CONSTANT IMMERSION.
- Chemisty of Epoxies (what's an ADDUCT?) page - CLICK HERE.
5. Image Of The Week - DNA with Adduct
- www.sdsc.edu
- DNA with Adduct.
- Hingerty at ORNL, an adduct located at one arm of a DNA replication fork model yielded a highly mobile structure. ...
6. DEALING: DEtecting Adduct Lesions IN the Genome
- wire.ndsu.nodak.edu
- DEALING: DEtecting Adduct Lesions IN the Genome.
- DEALING: DEtecting Adduct Lesions IN the Genome.
7. DNA Adduct Formation in Precision-Cut Rat Liver and Lung Slices Exposed to Benzo a pyrene -- Harrigan et al. 77 (2): 307 -- Toxicological Sciences
- toxsci.oupjournals.org
- DNA Adduct Formation in Precision-Cut Rat Liver and Lung Slices Exposed to Benzo a pyrene .
- Furthermore, the tissue distribution of BaP and BaPDNA adduct levels from in vivo studies were compared with those from the in vitro tissue slice experiments. ... Adduct levels (fmol adduct/µg DNA) in lung slices were greater than liver at all doses. ... Pretreatment of animals with TCDD prior to in vitro incubation with BaP potentiated the levels of DNA adduct formation. TCDD pretreatment altered the adduct distribution in lung but not in liver slices. ... Furthermore, the results validate the use of precision-cut tissue slices incubated in dynamic organ culture as a useful model for the study of chemicalDNA adduct formation. ...
- Key Words: benzo(a)pyrene; DNA adduct; cytochrome P-450; TCDD; tissue slices.
8. Adduct having an acidic solution of sparingly-soluble group IIA complexes
- www.alert.kattare.com
- Adduct having an acidic solution of sparingly-soluble group IIA complexes.
- An adduct that has an acidic solution of sparingly-soluble Group IIA complexes ("AGIIS") and at least one additive. ...
9. Cancer Spectrum: Tsuneoka et al., pp. 1227-1237.
- jncicancerspectrum.oupjournals.org
- 4-AminobiphenylInduced Liver and Urinary Bladder DNA Adduct Formation in Cyp1a2(/) and Cyp1a2(+/+) Mice .
- We used Cyp1a2(/) knockout mice to examine the role of CYP1A2 in ABPDNA adduct formation in the liver and the bladder. ... We evaluated ABP-induced toxicity by carrying out quantitative histology (of the liver, skin, and bladder), oxidative stress by measuring hepatic thiol levels, and liver and bladder DNA adduct formation by using 32P-postlabeling. ... TCDD pretreatment was associated with a decrease in ABPDNA adduct levels overall. ... Conclusions: Contrary to our expectations, CYP1A2 expression was not associated with ABP-induced hepatic oxidative stress or with ABPDNA adduct formation. ...
10. Nonchromatographic Assay for Malondialdehyde–Thiobarbituric Acid Adduct with HPLC Equivalence -- Badcock et al. 43 (9): 1655 -- Clinical Chemistry
- www.clinchem.org
- Nonchromatographic Assay for MalondialdehydeThiobarbituric Acid Adduct with HPLC Equivalence .
- The reaction yields a red MDA-TBA adduct, the product of 2 mol of TBA plus 1 mol of MDA (2). ...
- Isolation and quantification of the MDA-TBA adduct by HPLC reportedly largely eliminates the interfering chromogens (19)(20). ... In a discipline where published reference values can vary 100-fold (24), these examples represent remarkable concordance and question the ability of HPLC to reduce spectrophotometric interference to the MDA-TBA adduct. ...
- Why are HPLC methods in reality seemingly neither more discriminatory nor more valid than several traditional assays, despite almost unanimous claims to the contrary? HPLC methods are certainly less practical and less readily adapted to screening studies, and the red adduct stains the HPLC equipment, resulting in lengthy clean-up procedures. ...
- Sucrose, fructose, other carbohydrates, several amino acids, and ascorbic acid, when exposed to hydroxyl radicals produced by ionizing radiation or metal-ion H2O2 systems, yield products that give a genuine MDA-TBA adduct on heating with TBA (29) and were not considered as potential candidates. Various alkanals such as formaldehyde, acetaldehyde, propanal, and hexanal, which have been shown to both reduce MDA recovery and likewise coelute with the MDA-TBA adduct (12) were not considered as potential candidates either. ... Importantly, all chromatograms indicated only two chromogens, the red, which always corresponded to the red MDA-TBA adduct irrespective of mobile phase (8)(20)(21)(23)(30), and the yellow reactive substance, which coeluted with a peak previously ascribed to an endogenous yellow TBA marker (30). ...
- Examination of the majority of illustrative chromatograms generated from HPLC separation on C18 columns of the MDA-TBA adduct (8)(21)(23)(30)(31)(32) indicates a remarkable absence of those additional peaks that would be expected if HPLC separated the chromophore of interest from other interfering chromogens. ...
- The red MDA-TBA adduct was recovered completely by the NaOH extraction (99. ...
- (8)), with the alkaline MDA-TBA adduct neutralized within 10 min of back-extraction for subsequent injection, gave a line of best fit with a slope of 0. ...
- We conclude with the interesting and somewhat chastening observation that nonseparative methods that minimize background absorbance, either through correction factors, or, as in our case, back-extraction into NaOH, allow the MDA-TBA adduct to be measured with specificity comparable with HPLC methods. ...
- The thiobarbituric acid test for lipid peroxidation: structure of the adduct with malondialdehyde. ...
- Free and bound malondialdehyde measured as thiobarbituric acid adduct by HPLC in serum and plasma. ...
- High-performance liquid chromatographic separation of malondialdehyde-thiobarbituric acid adduct in biological materials (plasma and human cells) using a commercially available reagent. ...
- Lipoperoxides in plasma as measured by liquid-chromatographic separation of malondialdehyde-thiobarbituric acid adduct. ...
11. Biomarkers for Exposure to Ambient Air Pollution--Comparison of Carcinogen-DNA Adduct Levels with Other Exposure Markers and Markers for Oxidative Stress
- ehpnet1.niehs.nih.gov
- Biomarkers for Exposure to Ambient Air Pollution--Comparison of Carcinogen-DNA Adduct Levels with Other Exposure Markers and Markers for Oxidative Stress .
- 96 nmol/ml plasma), and polycyclic aromatic hydrocarbon (PAH)-albumin adduct (3. ... In the combined group of bus drivers and postal workers, negative correlations were observed between bulky carcinogen-DNA adduct and PAH-albumin levels (p = 0. 005), and between DNA adduct and -glutamyl semialdehyde (GGS) in hemoglobin (p = 0. ... 02) and between DNA adduct and urinary mutagenic activity (p = 0. ...
12. Escherichia coli Responses to a Single DNA Adduct -- Pandya et al. 182 (23): 6598 -- The Journal of Bacteriology
- jb.asm.org
- Our strategy involves heteroduplex plasmid DNA bearing a single site-specific DNA adduct and several mismatched regions. ... Using this approach, a single 1,N6-ethenodeoxyadenosine adduct was shown to be repaired inefficiently by excision repair, to inhibit DNA synthesis by approximately 80 to 90%, and to direct the incorporation of correct dTMP opposite this adduct. ...
- Mammalian Translesion DNA Synthesis across an Acrolein-derived Deoxyguanosine Adduct. ...
- Responses to the Major Acrolein-derived Deoxyguanosine Adduct in Escherichia coli. ...
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