Du Pont De Nemours Research Articles

AVIMID K

Abstract AVIMID K is a tacky, drapable tape or fabric prepreg based on a thermoplastic polyimide resin system. This datasheet provides information on composition, physical properties, tensile properties, and compressive and shear strength. Filing Code: Cp-22. Producer or source: E. I. Dupont de Nemours & Company Inc..

UltramicroELISA indirecto para la deteccion de anticuerpos totales a citomegalovirus en suero humano

We have standardized an indirect ultramicro ELISA assay for detecting antibodies to human Cytomegalovirus (CMV) using human serum samples (UMELISA CMV). The optimal concentration of coating antigen (30 ug/ml), serum dilution (1:40) and anti-human conjugate working dilution (1:1500), were determined by a check board titration method. The UMELISA CMV was compared with the latex agglutination test for antibodies to CMV (Dupont de Nemours) and with an indirect immunofluorescent method. The results have showed the high coincidence, sensitivity and especificity of the proposed assay regarding the two methods compared with, and supporting its use either for a blood donors screening or in the serological diagnosis of this infection by paired serum samples.

Optical properties from reflection electron energy loss spectroscopy

The optical constants of graphite (highly oriented pyrolitic graphite) and Kapton (Dupont de Nemours) polymer, pyromellitic dianhydride-oxy dyaniline (PMDA-ODA), over the 0–40 eV energy range, have been obtained by reflection electron energy loss spectroscopy (REELS) measurements. Raw data handling procedures, such as background subtraction, elastic peak elimination and the evaluation of the double-scattering contribution, are discussed. The influence of surface plasmons on the experimental line shapes is also considered in order to deduce the importance of surface effects in the REELS experiment. The pure Im(−1/ε) loss function is therefore obtained by a conventional Kramers-Kronig analysis giving the optical constants of the samples. The REELS-deduced optical constants are compared with those obtained by a conventional wide-range reflectivity spectrum, showing a very good agreement. No relaxation of dipole selection rules has been observed for the primary energy used (1.2 keV), thus justifying the retention of the optical limit assumption ( q → 0).

Sludge characterization, removal, and dewatering

In April 1988, E.I. du Pont de Nemours and Company retained the services of CH2M HILL to perform a sludge characterization study, treatability study, remedial design, and to provide construction management services during the remedial action for a slip containing wastewater sludge situated on the Baltimore Harbor. The slip contained an estimated 18,500 cubic yards of sludge that averaged 20 percent solids by weight. Organic compounds were the primary constituents in the sludge, with highest concentrations represented by benzene, ethylbenzene, toluene, and xylenes. During 1989 and 1990, the sludge was removed by a floating dredge, crane, and an air conveyance boom pumping system. A steel sheet pile wall was constructed around the slip to prevent the slip banks from collapsing during removal of the sludge. The sludge was treated using a cationic polymer of high molecular weight during flocculation, and a membrane filter press for dewatering. The sludge cake averaged 52 percent solids by weight. All sludgecake was disposed of offsite in a RCRA-permitted landfill.

People

Henri Irrthum, Du Pont de Nemours International S.A., Geneva, has been named director of titanium dioxide (TiO2) operations for Du Pont's White Pigments and Mineral Products businesses with E.I. du Pont de Nemours and Company, Wilmington, Delaware, U.SA He succeeds Dennis H. Reilley, who was recently promoted to vice president and general manager — White Pigment and Mineral Products.

Demonstration of Microfiltration Technology

The U.S. Environmental Protection Agency (EPA), in cooperation with E.I. DuPont de Nemours & Company, Inc. (DuPont) and the Oberlin Filter Company (Oberlin), undertook a field demonstration project to evaluate microfiltration technology for removal of zinc and suspended solids from wastewater. The microfiltration system utilized DuPont's Tyvek T-980 membrane filter media in conjunction with the Oberlin automatic pressure filter. The project was undertaken at the Palmerton Zinc Superfund site in April 1990 to verify the ability of the technology to remove dissolved zinc from the site's shallow groundwater. Pretreatment of the groundwater with lime for pH adjustment to precipitate dissolved zinc and other metals was included as part of the technology demonstration program. Analysis of the treated filtrate indicated that the system removed precipitated zinc and other suspended solids at an efficiency greater than 99.9 percent. The filter cake produced during the study passed both the Extraction Procedure (EP...

Effect of some additives on the biostability of a poly(etherurethane) elastomer

Journal of Biomedical Materials ResearchVolume 25, Issue 11 p. 1415-1416 ErratumFree Access Effect of some additives on the biostability of a poly(etherurethane) elastomer Y. Wu, Y. Wu Departments of Macromolecular Science and Pathology, Case Western Reserve University, Cleveland, Ohio 44106Search for more papers by this authorQ. Zhao, Q. Zhao Departments of Macromolecular Science and Pathology, Case Western Reserve University, Cleveland, Ohio 44106Search for more papers by this authorJ. M. Anderson, Corresponding Author J. M. Anderson Departments of Macromolecular Science and Pathology, Case Western Reserve University, Cleveland, Ohio 44106Institute of Pathology, Case Western Reserve University, 2085 Adelbert Road, Cleveland, OH 44106Search for more papers by this authorA. Hiltner, A. Hiltner Departments of Macromolecular Science and Pathology, Case Western Reserve University, Cleveland, Ohio 44106Search for more papers by this authorG. A. Lodoen, G. A. Lodoen E. I. du Pont de Nemours & Company, Inc., Waynesboro, Virginia 22980Search for more papers by this authorC. R. Payet, C. R. Payet E. I. du Pont de Nemours & Company, Inc., Wilmington, Delaware 19880Search for more papers by this author Y. Wu, Y. Wu Departments of Macromolecular Science and Pathology, Case Western Reserve University, Cleveland, Ohio 44106Search for more papers by this authorQ. Zhao, Q. Zhao Departments of Macromolecular Science and Pathology, Case Western Reserve University, Cleveland, Ohio 44106Search for more papers by this authorJ. M. Anderson, Corresponding Author J. M. Anderson Departments of Macromolecular Science and Pathology, Case Western Reserve University, Cleveland, Ohio 44106Institute of Pathology, Case Western Reserve University, 2085 Adelbert Road, Cleveland, OH 44106Search for more papers by this authorA. Hiltner, A. Hiltner Departments of Macromolecular Science and Pathology, Case Western Reserve University, Cleveland, Ohio 44106Search for more papers by this authorG. A. Lodoen, G. A. Lodoen E. I. du Pont de Nemours & Company, Inc., Waynesboro, Virginia 22980Search for more papers by this authorC. R. Payet, C. R. Payet E. I. du Pont de Nemours & Company, Inc., Wilmington, Delaware 19880Search for more papers by this author First published: November 1991 https://doi.org/10.1002/jbm.820251109Citations: 2AboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL No abstract is available for this article.Citing Literature Volume25, Issue11November 1991Pages 1415-1416 RelatedInformation

Immobilization of perfluoroalkylated enzymes in a biologically active state onto Perflex support.

Perflex has been introduced by E. I. du Pont de Nemours and Co., Inc., as a new fluorocarbon-based technology for protein immobilization. Due to the hydrophobic character of the support, however, significant loss of enzymatic activity may occur upon immobilization of certain enzymes, which appears to be due to a large conformational change of the protein ("inversion"). Pretreatment of the Perflex support with a neutral fluorosurfactant lessened the surface hydrophobicity, thus decreasing the hydrophobic interaction between the support and the protein. Modification of enzymes with a high number of fluorocarbon residues, which forms a hydrophobic "envelope" around the protein, also appears to prevent enzyme inactivation upon immobilization on Perflex support. Moreover, preactivation of the support with either perfluorooctylpropylisocyanate or reactive poly(fluoroalkyl) sugar reagents greatly improves the enzyme particle activity by increasing the amount of immobilized enzyme. Fluorosurfactant treatment of the support activated with perfluorooctylpropylisocyanate improves the retention of activity for sensitive enzymes such as alpha-chymotrypsin and increases the wetability and ease of handling of the Perflex particles.

ZYMAXX

Abstract ZYMAXX provides outstanding compressive creep resistance, toughness and chemical inertness at high temperatures and pressures and under adverse conditions. They have a wide range of uses beyond chemical processing, including aerospace and automotive applications, general industrial equipment, home appliances, farm and construction equipment. This datasheet provides information on physical properties, hardness, tensile properties, and compressive strength as well as fracture toughness and creep. It also includes information on corrosion resistance. Filing Code: Cp-18. Producer or source: E. I. Dupont de Nemours & Company Inc..

Interference in GC/MS confirmation of delta-9-tetrahydrocannabinol-9-carboxylic acid by a secondary tetrahydrocannabinol metabolite

Journal Article Interference in GC/MS confirmation of delta-9-tetrahydrocannabinol-9-carboxylic acid by a secondary tetrahydrocannabinol metabolite Get access B I Podkowik, B I Podkowik Depment of Clinical Biochemistry,London Hospital Medical College, Turner St., London El 2AD, U.K Address correspondence to this author. Search for other works by this author on: Oxford Academic Google Scholar D J Kippenberger, D J Kippenberger E. I. du Pont de Nemours and Co., Medical Products Dept.,Glasgow Research Labs., Wilmington, DE Search for other works by this author on: Oxford Academic Google Scholar M L Smith M L Smith Depment of Clinical Biochemistry,London Hospital Medical College, Turner St., London El 2AD, U.K Search for other works by this author on: Oxford Academic Google Scholar Clinical Chemistry, Volume 37, Issue 7, 1 July 1991, Pages 1307–1308, https://doi.org/10.1093/clinchem/37.7.1307 Published: 01 July 1991

KEVLAR/J-2

Abstract KEVLAR/J-2 is an advanced thermoplastic composite material based on J-2 copolymer reinforced with continuous KEVLAR fiber. The inherent fiber/matrix compatibility of this composite provides attractive mechanical properties. This datasheet provides information on physical properties, tensile properties, and compressive and shear strength. It also includes information on corrosion resistance. Filing Code: Cp-14. Producer or source: E. I. Dupont de Nemours & Company Inc..

Quantitative evaluation of four 99Tcm colloids for bone marrow scintigraphy using single photon emission computed tomography

Colloids used for bone marrow scintigraphy are also taken up in the liver and spleen. The liver activity in particular hampers interpretation of the study. In this study, four small-sized commercial colloids labelled with 99Tcm were compared for bone marrow uptake relative to the liver, spleen and background activity. Three human albumin colloids (Microlite, E.I. du Pont de Nemours & Co; Solco Nanocoll, Solco Nuclear; TCK-9, International CIS) and one antimony sulphide colloid (TechneScan Sb2S3, Mallinckrodt Diagnostics) were compared. The study was performed in patients routinely referred for liver/spleen scintigraphy who had a normal result. Each examination was carried out using single photon emission computed tomography. After correction for attenuation and scattering of photons, the activity of the bone marrow of the lumbar spine was related to the liver, spleen and background activity. The bone marrow/liver activity quotient of Solco Nanocoll and TCK-9 was almost twice the value for Microlite and TechneScan Sb2S3. The bone marrow/spleen quotient was almost four times higher and the bone marrow/background quotient almost twice as high for Solco Nanocoll as for the other three colloids, between which there were no significant differences.

Simple and inexpensive detection and confirmation of anti-HIV-1 in sera from Africa

250 sera from Ndola Zambia collected from consecutive patients with clinical evidence of HIV infection were screened by an algorithm utilizing the Serodia-HIV gelatin particle agglutination test (Fujirebio Inc Tokyo) and if positive with the HIVCHEK (DuPont de Nemours Deutschland Bad Homburg Germany). As a validation of the algorithm the sera were also divided in 2 and retested both locally and after being carried frozen to Gottingen Germany with 5 HIV tests as follows: 1) ENV-80 ELISA for a biosynthetic polypeptide from gp41; 2) DPZ-ELISA for a viral extract from Jurkat/HTLV-IIIB cultures; 3) Serodia-HIV; 4) HIVCHEK 1+2; and 5) radio-immuno-precipitation assay (RIPA) for confirmation. Sera were classified as negative if they failed to react with all 4 screening tests; positive if they reacted with 1 virus core protein and 1 virus envelope glycoprotein screening test; and indeterminant if they reacted to only 1 core or 1 envelope screening test. 53 of the 250 sera were unreactive to all 4 screening tests. There were 151 sera positive on RIPA 4 with weak bands and 42 unreactive on RIPA. The Serodia-HIV was highly sensitive detecting all positives but 9 false positives. The HIVCHEK was more specific with only 3 false positives but 15 false negatives. By following the algorithm 151 positive sera and 94 negative sera were classified correctly. 4 sera appearing indeterminant on RIPA had weak reactions on Serodia-HIV and negative findings on HIVCHEK: thus the algorithm identified the indeterminant sera correctly. One serum was clearly positive on Serodia-HIV and negative on RIPA then on retesting showed a weak band for p24 on RIPA indicating a patient in early stages of seroconversion. Using the algorithm with RIPA done at a tertiary center instead of Western Blot would lower the cost of screening with confirmation of indeterminant sera from US$25 to $7.80 per average result. Neither of the 2 screening tests requires laboratory apparatus and could be done in primary and secondary health centers in a rural African setting. Furthermore HIVCHEK 1+2 can be used where HIV-2 as well as HIV-1 viruses are epidemic.

4983515 Labeled cryopreserved cells for use as targets in cytotoxicity assays: Derrick T Maley, Agneta K Nordstrom assigned to E I du Pont de Nemours and Company

4983515 Labeled cryopreserved cells for use as targets in cytotoxicity assays: Derrick T Maley, Agneta K Nordstrom assigned to E I du Pont de Nemours and Company

4952493 Peptide substrates for detecting virus-specified protease activity: Charles A Kettner, Bruce D Korant assigned to E I du Pont de Nemours and Company

4952493 Peptide substrates for detecting virus-specified protease activity: Charles A Kettner, Bruce D Korant assigned to E I du Pont de Nemours and Company

A ruggedized ZnS(Ag)/epoxy alpha scintillation detector

An alpha scintillation survey instrument has been developed which is more rugged and efficient than conventional alpha scintillation detectors that use aluminized Mylar ∗∗ ∗∗ Mylar is a trademark of E.I. du Pont de Nemours & Co., Inc., Wilmington, DE, USA. radiation entrance windows. This new detector consists of a mixture of ZnS(Ag) phosphor and optically transparent epoxy. The scintillator mixture is poured into a preformed mold to provide a thin layer of phosphor after the particles settle to the clear epoxy surface. After partial curing, an optically transparent light pipe is coupled to the ZnS(Ag)/epoxy film by using an additional thin epoxy layer, forming a monolithic scintillator assembly. Experimental results indicate that the new probe is 44% efficient (2π) for a large-area 239Pu alpha source; resistant to scratches, tears, and corrosives; watertight; and temperature independent between −20°C and 54°C.

Confirmatory tests for human T-cell leukemia virus type 1 (HTLV-1): Western blot compared with RIPA on African sera

Confirmation of human T-Cell leukemia virus type 1 (HTLV-1) seropositivity calls for reactivity against at least 2 proteins encoded by 2 different genes, revealed by Western blot (WB) and /or radioimmuno-precipitation assay (RIPA). To evaluate the use of WB as a basis for applying these criteria, we conducted a study of two types of WB and compared them with RIPA patterns. The first part of the work, performed with 40 African sera, used Dupont de Nemours commercialized WB and an ‘in-house’ WB. Both WB detected antibody to proteins encoded by 2 different genes: antibody to gag products were revealed equally by both WB, but commercialized WB detected antibody to tax protein whereas the ‘in-house’ WB detected antibody to env protein (gp46) more efficiently. The second part of the work, conducted with 158 African sera, compared results of an ‘in-house’ virus lysate WB and RIPA. Our data show a perfect concordance between the two procedures when sera were clearly positive by WB ( gag + env reaction). Sera reacting to p19 and p24 (both gag) by WB were confirmed positive by RIPA in 75% of the cases. The majority of the indeterminate WB profiles not confirmed by RIPA presented isolated gag reactivity (p15 or p19 or p24).

AVIMID N/GRAPHITE

Abstract AVIMID N / GRAPHITE is a carbon-fiber/polyimide, high-temperature composite tooling material developed to fabricate quality parts from prepregs based on thermoplastics. This datasheet provides information on physical properties, and tensile properties as well as fracture toughness. It also includes information on high temperature performance. Filing Code: Cp-11. Producer or source: E. I. Dupont de Nemours & Company Inc..

ChemInform Abstract: X‐Ray Excited Gd(III) Emission in Some Ternary Barium Fluorides

ChemInformVolume 21, Issue 43 Physical Inorganic Chemistry ChemInform Abstract: X-Ray Excited Gd(III) Emission in Some Ternary Barium Fluorides L. H. BRIXNER, L. H. BRIXNER E. I. du Pont de Nemours and Co., Cent. Res. Dev. Dep., Exp. Stn., Wilmington, DE 19880-0356, USASearch for more papers by this authorG. BLASSE, G. BLASSE E. I. du Pont de Nemours and Co., Cent. Res. Dev. Dep., Exp. Stn., Wilmington, DE 19880-0356, USASearch for more papers by this author L. H. BRIXNER, L. H. BRIXNER E. I. du Pont de Nemours and Co., Cent. Res. Dev. Dep., Exp. Stn., Wilmington, DE 19880-0356, USASearch for more papers by this authorG. BLASSE, G. BLASSE E. I. du Pont de Nemours and Co., Cent. Res. Dev. Dep., Exp. Stn., Wilmington, DE 19880-0356, USASearch for more papers by this author First published: October 23, 1990 https://doi.org/10.1002/chin.199043013Read the full textAboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onFacebookTwitterLinkedInRedditWechat No abstract is available for this article. Volume21, Issue43October 23, 1990 RelatedInformation

Clinical comparison of isolator and BACTEC 660 resin media for blood culture

The 10-ml Isolator system (E.I. du Pont de Nemours & Co., Inc., Wilmington, Del.) was compared with the BACTEC 16A-17A nonradiometric resin system (Johnston Laboratories, Inc., Towson, Md.) for isolation of organisms from 6,839 paired blood cultures. Equal volumes of blood (6 to 10 ml for each Isolator and 3 to 5 ml for each BACTEC bottle) were cultured in parallel in the two systems, and 600 isolates that were judged to be clinically significant by chart review were recovered during the study. The BACTEC resin system detected 510 (85%) and the Isolator system detected 435 (72%) of the clinically significant isolates (P less than 0.001). Of 45 polymicrobial blood cultures, the BACTEC system detected 32 (71%) and the Isolator system detected 21 (47%) (P less than 0.05). Of 253 gram-negative bacilli isolated during the study, 30% were detected only in the BACTEC system and 16% were detected only in the Isolator system (P less than 0.001), and of 56 nonfermentative or fastidious gram-negative bacilli detected, 46% were recovered only in the BACTEC system, while 14% were detected only in the Isolator system (P less than 0.001). Of 86 streptococci isolated during the study, 30% were detected only in the BACTEC system, and 4% were detected only in the Isolator system (P less than 0.001). Recoveries of anaerobic bacteria, staphylococci, and yeasts were equivalent in the two systems. Organisms judged to be contaminants were detected in approximately 1% of the cultures in each system. The results suggest that use of resin media renders the BACTEC nonradiometric system equivalent or superior to the Isolator system for detection of clinically significant organisms in blood cultures.