Result 1 - 10 of total 84
2023
| Keywords | Text ; abstract_or_summary ; ddc:570 |
|---|---|
| Language | English |
| Publishing date | 2023-04-11 |
| Publishing country | de |
| Document type | Article ; Online |
| Database | BASE - Bielefeld Academic Search Engine (life sciences selection) |
Your chosen title can be delivered directly to ZB MED Cologne location if you are registered as a user at ZB MED Cologne.
2014
| Title variant | Indigenous American literature |
|---|---|
| Author's details | ed. by James H. Cox |
| Keywords | American literature/Indian authors/History and criticism ; Indians in literature ; Indians of North America/Intellectual life |
| Language | English |
| Size | XXII, 741 S., Ill., graph. Darst., Kt. |
| Publisher | Oxford Univ. Press |
| Publishing place | Oxford u.a. |
| Document type | Book |
| Note | Enth. Literaturangaben und Index |
| ISBN | 9780199914036 ; 0199914036 |
| Database | Former special subject collection: coastal and deep sea fishing |
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2014
| Author's details | ed. by James H. Cox |
|---|---|
| Keywords | American literature/Indian authors/History and criticism ; Indians in lterature ; Indians of North America/Intellectual life |
| Language | English |
| Size | XXII, 741 S., Ill., graph. Darst., Kt. |
| Publisher | Oxford Univ. Press |
| Publishing place | Oxford u.a. |
| Document type | Book |
| Note | Enth. Literaturangaben und Index |
| ISBN | 9780199914036 ; 0199914036 |
| Database | Library catalogue of the German National Library of Science and Technology (TIB), Hannover |
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Your chosen title can be delivered directly to ZB MED Cologne location if you are registered as a user at ZB MED Cologne.
Journal of the American Chemical Society
2023 Volume 145, Issue 20, Page(s) 11151–11160
Abstract: Epoxy thermosets are high-volume materials that play a central role in a wide range of engineering applications; however, technologies to recycle these polymers remain rare. Here, we present a catalytic, light-driven method that enables chemical ... ...
| Abstract | Epoxy thermosets are high-volume materials that play a central role in a wide range of engineering applications; however, technologies to recycle these polymers remain rare. Here, we present a catalytic, light-driven method that enables chemical recycling of industrially relevant thiol epoxy thermosets to their original monomer at ambient temperature. This strategy relies on the proton-coupled electron transfer (PCET) activation of hydroxy groups within the polymer network to generate key alkoxy radicals that promote the fragmentation of the polymer through C-C bond β-scission. The method fully depolymerizes insoluble thiol epoxy thermosets into well-defined mixtures of small-molecule products, which can collectively be converted into the original monomer via a one-step dealkylation process. Notably, this process is selective and efficient even in the presence of other commodity plastics and additives commonly found in commercial applications. These results constitute an important step toward making epoxy thermosets recyclable and more generally exemplify the potential of PCET to offer a more sustainable end-of-life for a diverse array of commercial plastics. |
|---|---|
| Language | English |
| Publishing date | 2023-05-11 |
| Publishing country | United States |
| Document type | Journal Article |
| ZDB-ID | 3155-0 |
| ISSN | 1520-5126 ; 0002-7863 |
| ISSN (online) | 1520-5126 |
| ISSN | 0002-7863 |
| DOI | 10.1021/jacs.3c00958 |
| Database | MEDical Literature Analysis and Retrieval System OnLINE |
| Z 4' 55/32: Show issues | ||||
| Z 7.3: Show issues |
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Journal of the American Chemical Society
2021 Volume 143, Issue 31, Page(s) 12268–12277
Abstract: The accumulation of persistent plastic waste in the environment is widely recognized as an ecological crisis. New chemical technologies are necessary both to recycle existing plastic waste streams into high-value chemical feedstocks and to develop next- ... ...
| Abstract | The accumulation of persistent plastic waste in the environment is widely recognized as an ecological crisis. New chemical technologies are necessary both to recycle existing plastic waste streams into high-value chemical feedstocks and to develop next-generation materials that are degradable by design. Here, we report a catalytic methodology for the depolymerization of a commercial phenoxy resin and high molecular weight hydroxylated polyolefin derivatives upon visible light irradiation near ambient temperature. Proton-coupled electron transfer (PCET) activation of hydroxyl groups periodically spaced along the polymer backbone furnishes reactive alkoxy radicals that promote chain fragmentation through C-C bond β-scission. The depolymerization produces well-defined and isolable product mixtures that are readily diversified to polycondensation monomers. In addition to controlling depolymerization, the hydroxyl group modulates the thermomechanical properties of these polyolefin derivatives, yielding materials with diverse properties. These results demonstrate a new approach to polymer recycling based on light-driven C-C bond cleavage that has the potential to establish new links within a circular polymer economy and influence the development of new degradable-by-design polyolefin materials. |
|---|---|
| Language | English |
| Publishing date | 2021-07-31 |
| Publishing country | United States |
| Document type | Journal Article ; Research Support, U.S. Gov't, Non-P.H.S. ; Research Support, Non-U.S. Gov't |
| ZDB-ID | 3155-0 |
| ISSN | 1520-5126 ; 0002-7863 |
| ISSN (online) | 1520-5126 |
| ISSN | 0002-7863 |
| DOI | 10.1021/jacs.1c05330 |
| Database | MEDical Literature Analysis and Retrieval System OnLINE |
| Z 4' 55/32: Show issues | ||||
| Z 7.3: Show issues |
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Journal of the American Chemical Society. 2021 July 31, v. 143, no. 31
2021
Abstract: The accumulation of persistent plastic waste in the environment is widely recognized as an ecological crisis. New chemical technologies are necessary both to recycle existing plastic waste streams into high-value chemical feedstocks and to develop next- ... ...
| Abstract | The accumulation of persistent plastic waste in the environment is widely recognized as an ecological crisis. New chemical technologies are necessary both to recycle existing plastic waste streams into high-value chemical feedstocks and to develop next-generation materials that are degradable by design. Here, we report a catalytic methodology for the depolymerization of a commercial phenoxy resin and high molecular weight hydroxylated polyolefin derivatives upon visible light irradiation near ambient temperature. Proton-coupled electron transfer (PCET) activation of hydroxyl groups periodically spaced along the polymer backbone furnishes reactive alkoxy radicals that promote chain fragmentation through C–C bond β-scission. The depolymerization produces well-defined and isolable product mixtures that are readily diversified to polycondensation monomers. In addition to controlling depolymerization, the hydroxyl group modulates the thermomechanical properties of these polyolefin derivatives, yielding materials with diverse properties. These results demonstrate a new approach to polymer recycling based on light-driven C–C bond cleavage that has the potential to establish new links within a circular polymer economy and influence the development of new degradable-by-design polyolefin materials. |
|---|---|
| Keywords | ambient temperature ; cleavage (chemistry) ; condensation reactions ; depolymerization ; electron transfer ; feedstocks ; hydroxylation ; irradiation ; light ; molecular weight ; polyolefin ; wastes |
| Language | English |
| Dates of publication | 2021-0731 |
| Size | p. 12268-12277. |
| Publishing place | American Chemical Society |
| Document type | Article |
| ZDB-ID | 3155-0 |
| ISSN | 1520-5126 ; 0002-7863 |
| ISSN (online) | 1520-5126 |
| ISSN | 0002-7863 |
| DOI | 10.1021/jacs.1c05330 |
| Database | NAL-Catalogue (AGRICOLA) |
| Z 4' 55/32: Show issues | ||||
| Z 7.3: Show issues |
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American Indian writers and indigenous Mexico
(Indigenous Americas)
2012
| Author's details | James H. Cox |
|---|---|
| Series title | Indigenous Americas |
| Keywords | American literature/Indian authors/History and criticism ; Indians in literature ; Mexico |
| Language | English |
| Size | X, 275 S. |
| Publisher | University of Minnesota Press |
| Publishing place | Minneapolis, Minn. u.a. |
| Document type | Book |
| Note | Enth. Literaturverz. S. 247 - 262 und Index |
| ISBN | 9780816675975 ; 9780816675982 ; 081667597X ; 0816675988 |
| Database | Former special subject collection: coastal and deep sea fishing |
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Proceedings of the National Academy of Sciences of the United States of America
2024 Volume 121, Issue 11, Page(s) e2316032121
Abstract: Nitrogen-vacancy (NV) centers in diamond are a promising platform for nanoscale NMR sensing. Despite significant progress toward using NV centers to detect and localize nuclear spins down to the single spin level, NV-based spectroscopy of individual, ... ...
| Abstract | Nitrogen-vacancy (NV) centers in diamond are a promising platform for nanoscale NMR sensing. Despite significant progress toward using NV centers to detect and localize nuclear spins down to the single spin level, NV-based spectroscopy of individual, intact, arbitrary target molecules remains elusive. Such sensing requires that target molecules are immobilized within nanometers of NV centers with long spin coherence. The inert nature of diamond typically requires harsh functionalization techniques such as thermal annealing or plasma processing, limiting the scope of functional groups that can be attached to the surface. Solution-phase chemical methods can be readily generalized to install diverse functional groups, but they have not been widely explored for single-crystal diamond surfaces. Moreover, realizing shallow NV centers with long spin coherence times requires highly ordered single-crystal surfaces, and solution-phase functionalization has not yet been shown with such demanding conditions. In this work, we report a versatile strategy to directly functionalize C-H bonds on single-crystal diamond surfaces under ambient conditions using visible light, forming C-F, C-Cl, C-S, and C-N bonds at the surface. This method is compatible with NV centers within 10 nm of the surface with spin coherence times comparable to the state of the art. As a proof-of-principle demonstration, we use shallow ensembles of NV centers to detect nuclear spins from surface-bound functional groups. Our approach to surface functionalization opens the door to deploying NV centers as a tool for chemical sensing and single-molecule spectroscopy. |
|---|---|
| Language | English |
| Publishing date | 2024-03-07 |
| Publishing country | United States |
| Document type | Journal Article |
| ZDB-ID | 209104-5 |
| ISSN | 1091-6490 ; 0027-8424 |
| ISSN (online) | 1091-6490 |
| ISSN | 0027-8424 |
| DOI | 10.1073/pnas.2316032121 |
| Database | MEDical Literature Analysis and Retrieval System OnLINE |
| Zs.A 1148: Show issues | Location: Je nach Verfügbarkeit (siehe Angabe bei Bestand) bis Jg. 1994: Bestellungen von Artikeln über das Online-Bestellformular Jg. 1995 - 2021: Lesesall (1.OG) ab Jg. 2022: Lesesaal (EG) |
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an analysis of the congressional reauthorization process
2004
Abstract: Examines when Congress is more or less likely to reauthorize an agency or program as part of its larger attempts to retain control over ... ...
| Institution | United States / Congress ebrary, Inc |
|---|---|
| Author's details | James H. Cox |
| Abstract | Examines when Congress is more or less likely to reauthorize an agency or program as part of its larger attempts to retain control over policymaking |
| Keywords | Administrative agencies/Decision making ; Bureaucracy ; Delegation of powers ; Legislative oversight |
| Language | English |
| Size | Online-Ressource (xvi, 160 p), ill, 25 cm |
| Publisher | Praeger |
| Publishing place | Westport, Conn |
| Document type | Book ; Conference proceedings ; Online |
| Note | Includes bibliographical references (p. [143]-153) and index |
| ISBN | 0275978524 ; 9780275978525 |
| Database | Library catalogue of the German National Library of Science and Technology (TIB), Hannover |
This service is chargeable due to the Delivery terms set by subito. Orders including an article and supplementary material will be classified as separate orders. In these cases, fees will be demanded for each order.
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Socius : sociological research for a dynamic world
2018 Volume 4
Abstract: The unique physical, cultural, and ecological location of U.S. American Indian reservations simultaneously presents risks for mental health and offers sources of resilience to Native peoples. Using survey data from two American Indian tribes, we explore ... ...
| Abstract | The unique physical, cultural, and ecological location of U.S. American Indian reservations simultaneously presents risks for mental health and offers sources of resilience to Native peoples. Using survey data from two American Indian tribes, we explore whether the length of one's life spent on a reservation is associated with lower odds of psychological distress. In both tribes, we find that individuals who live a vast majority of their lives on the reservation have lower odds of psychological distress than individuals who spent portions of their life off or near the reservation. These findings suggest a need to reframe the perception of life experience on tribal reservations but also call for a more nuanced investigation of the life experience of American Indians. This study illustrates the importance of deeply exploring the relationship that American Indians have with their tribal reservation lands. |
|---|---|
| Language | English |
| Publishing date | 2018-11-12 |
| Publishing country | United States |
| Document type | Journal Article |
| ZDB-ID | 2844637-9 |
| ISSN | 2378-0231 ; 2378-0231 |
| ISSN (online) | 2378-0231 |
| ISSN | 2378-0231 |
| DOI | 10.1177/2378023118807022 |
| Database | MEDical Literature Analysis and Retrieval System OnLINE |
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