Relevant bibliographies by topics / Imidy

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Academic literature on the topic 'Imidy'

Author: Grafiati
Published: 4 June 2021
Last updated: 25 April 2022

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Journal articles on the topic "Imidy"

1

Dunbar, Karen, Thomas J. Macartney, and Gopal P. Sapkota. "IMiDs induce FAM83F degradation via an interaction with CK1α to attenuate Wnt signalling." Life Science Alliance 4, no. 2 (December 23, 2020): e202000804. http://dx.doi.org/10.26508/lsa.202000804.

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Immunomodulatory imide drugs (IMiDs) bind CRBN, a substrate receptor of the Cul4A E3 ligase complex, enabling the recruitment of neo-substrates, such as CK1α, and their degradation via the ubiquitinproteasome system. Here, we report FAM83F as such a neo-substrate. The eight FAM83 proteins (A-H) interact with and regulate the subcellular distribution of CK1α. We demonstrate that IMiD-induced FAM83F degradation requires its association with CK1α. However, no other FAM83 protein is degraded by IMiDs. We have recently identified FAM83F as a mediator of the canonical Wnt signalling pathway. The IMiD-induced degradation of FAM83F attenuated Wnt signalling in colorectal cancer cells and removed CK1α from the plasma membrane, mirroring the phenotypes observed with genetic ablation of FAM83F. Intriguingly, the expression of FAM83G, which also binds to CK1α, appears to attenuate the IMiD-induced degradation of CK1α, suggesting a protective role for FAM83G on CK1α. Our findings reveal that the efficiency and extent of target protein degradation by IMiDs depends on the nature of inherent multiprotein complex in which the target protein is part of.
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2

Yang, Seung-Joo, Seungje Jeon, Jeong Won Baek, Kwang Min Lee, and Chul-Seung Park. "Regulation of AMPK Activity by CRBN Is Independent of the Thalidomide-CRL4CRBN Protein Degradation Axis." Pharmaceuticals 14, no. 6 (May 26, 2021): 512. http://dx.doi.org/10.3390/ph14060512.

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Cereblon (CRBN), a primary target of immune-modulatory imide drugs (IMiDs), functions as a substrate receptor in the CUL4-RBX1-DDB1-CRBN (known as CRL4CRBN) E3 ubiquitin ligase complex. Binding of IMiDs to CRBN redirects the CRL4CRBN E3 ubiquitin ligase to recruit or displace its substrates. Interaction between CRBN and the AMPK α subunit leads to CRL4CRBN-dependent degradation of the γ subunit and inhibits AMPK activity. However, the effect of thalidomide on the function of CRBN as a negative regulator of AMPK through interaction with the α subunit remains unclear. Here, we show that thalidomide does not affect AMPK activation or the binding affinity between CRBN and the AMPK α subunit. Thalidomide had no effect on AMPK activity independent of CRBN expression. The N-terminal region and C-terminal tail of CRBN, which is distinct from the IMiD binding site, were critical for interaction with the AMPK α subunit. The present results suggest that CRL4CRBN negatively regulates AMPK through a pathway independent from the CRBN-IMiD binding region.
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Costacurta, Matteo, Jackson He, Philip E. Thompson, and Jake Shortt. "Molecular Mechanisms of Cereblon-Interacting Small Molecules in Multiple Myeloma Therapy." Journal of Personalized Medicine 11, no. 11 (November 11, 2021): 1185. http://dx.doi.org/10.3390/jpm11111185.

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Thalidomide analogues (or immunomodulatory imide drugs, IMiDs) are cornerstones in the treatment of multiple myeloma (MM). These drugs bind Cereblon (CRBN), a receptor for the Cullin-ring 4 ubiquitin-ligase (CRL4) complex, to modify its substrate specificity. IMiDs mediate CRBN-dependent engagement and proteasomal degradation of ‘neosubstrates’, Ikaros (IKZF1) and Aiolos (IKZF3), conveying concurrent antimyeloma activity and T-cell costimulation. There is now a greater understanding of physiological CRBN functions, including endogenous substrates and chaperone activity. CRISPR Cas9-based genome-wide screening has further elucidated the complex cellular machinery implicated in IMiD sensitivity, including IKZF1/3-independent mechanisms. New-generation IMiD derivatives with more potent anti-cancer properties—the CELMoDs (Cereblon E3 ligase modulators)—are now being evaluated. Rational drug design also allows ‘hijacking’ of CRL4CRBN utilising proteolysis targeting chimeras (PROTACs) to convey entirely distinct substrate repertoires. As all these chemotypes—thalidomide, IMiDs, CELMoDs and PROTACs—engage CRBN and modify its functions, we describe them here in aggregate as ‘CRBN-interacting small molecules’ (CISMs). In this review, we provide a contemporary summary of the biological consequences of CRBN modulation by CISMs. Detailed molecular insight into CRBN–CISM interactions now provides an opportunity to more effectively target previously elusive cancer dependencies, representing a new and powerful tool for the implementation of precision medicine.
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4

Tochigi, Taro, Toshihiro Miyamoto, Kiwamu Hatakeyama, Teppei Sakoda, Daisuke Ishihara, Hidetoshi Irifune, Takahiro Shima, et al. "Aromatase is a novel neosubstrate of cereblon responsible for immunomodulatory drug–induced thrombocytopenia." Blood 135, no. 24 (June 11, 2020): 2146–58. http://dx.doi.org/10.1182/blood.2019003749.

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Abstract Immunomodulatory drugs (IMiDs) are key agents for the treatment of multiple myeloma and myelodysplastic syndrome with chromosome 5q deletion. IMiDs exert their pleiotropic effects through the recruitment of neosubstrates to cereblon, a substrate receptor of the E3 ubiquitin ligase complex; therefore, identification of cell-specific neosubstrates is important to understand the effects of IMiDs. In clinical practice, IMiDs induce thrombocytopenia, which frequently results in the discontinuation of IMiD treatment. In the current study, we sought to identify the molecular mechanism underlying thrombocytopenia induced by IMiD treatment. We found that IMiDs strongly impaired proplatelet formation, a critical step in functional platelet production, through the inhibition of autocrine estradiol signaling in human megakaryocytes. Furthermore, we identified aromatase, an indispensable enzyme for estradiol biosynthesis, as a novel neosubstrate of cereblon. IMiDs promoted the recruitment of aromatase to cereblon, resulting in the degradation of aromatase in a proteasome-dependent manner. Finally, aromatase was significantly degraded in the bone marrow of patients with multiple myeloma who developed thrombocytopenia with IMiD treatment. These data suggest that aromatase is a neosubstrate of cereblon that is responsible for IMiD-induced thrombocytopenia.
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5

Xu, Yibing, JianWu Li, Greg Ferguson, Frank Mercurio, Gody Khambatta, Lisa Morrison, Antonia Lopez-Girona, et al. "Identification of Novel Activities of Immunomodulatory Drugs: Cytoskeleton Reorganization through Modulation of Rho GTPases." Blood 112, no. 11 (November 16, 2008): 2565. http://dx.doi.org/10.1182/blood.v112.11.2565.2565.

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Abstract Immunomodulatory drugs including the IMiDs®, lenalidomide, and pomalidomide represent a novel class of compounds that have both anti-cancer and anti-inflammatory properties. While many studies have demonstrated that IMiDs have broad in vitro and in vivo biological activities including antiangiogenesis, inhibition of TNFa expression, enhancement of antitumor immunity, and induction of IL-2 in T cells, the molecular mechanism through which these drugs exert their effects is largely undefined. In primary human monocytes, IMID1 selectively activated RhoA and Rac1, but not Cdc42 or Ras. Importantly, the activation of these GTPases occurred immediately following treatment with IMID1 in the absence of any costimulation. Consistent with the activation of Rho GTPases, we found that IMID1enhanced F-actin formation, stabilized microtubules, and increased monocyte cell migration, all of which were blocked by selective inhibitors of ROCK1, a downstream effector of RhoA or Rac1. Finally, we demonstrated that IMID1 was able to regulate the activity of Rho GTPases and formation of F-actin in primary human T cells similarly as it did in monocytes, and showed that the activation of RhoA was essential for IMID1-induced IL-2 expression in T cells. In conclusion, these studies demonstrate a novel and acute molecular activity from IMiDs mediated via Rho GTPases. Activation of Rho by IMiDs and the resulting effect on cytoskeletal reorganization may represent a critical mechanism by which IMiDs function as therapeutic immunomodulatory agents.
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6

Firoozmand, Amin, Naveed Ali, Nausheen Ahmed, Pingfu Fu, Shufen Cao, George Brown, Hannah Schmikla, et al. "A highly effective and practical desensitization regimen: Results in comparable clinical outcomes for multiple myeloma patients with skin rash after immunomodulatory drugs." Journal of Clinical Oncology 38, no. 15_suppl (May 20, 2020): 12104. http://dx.doi.org/10.1200/jco.2020.38.15_suppl.12104.

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12104 Background: Immunomodulatory drugs (IMiDs) are backbone of myeloma therapy for patients with Multiple Myeloma (MM). The incidence of IMiD-associated rash is up to 27% in some reports impeding maximal benefit of this agent. The optimal management of IMiDs-associated skin is unclear. The concurrent weekly Dexamethasone (Dex) does not diminish the incidence of skin eruptions with IMiDs (Sviggum, et al. 2006), therefore we designed a low dose daily and tapering corticosteroid regimen to tame this immune response upon restarting IMiDs and allow desensitization and reinstitution of the same IMiD. Furthermore, we assessed the impact of this desensitization regimen on clinical outcome. Methods: A total of 160 patients were evaluated. The incidence of rash was found to be 13% (n = 21). A cohort of age- and gender-matched without rash (n = 39) was randomly selected. The effects of rash on overall and progression free survival (OS and PFS) were further estimated using Cox regression controlling the effects of age and gender. Results: Median time to development of rash after IMiD initiation was 28 days (range, 2-232). Rashes were graded as low (I-II) in 89% (n = 17) and high (III-IV) in 19% of pts. All pts were managed by temporary treatment interruption and upon clearance of rash, re-institution of the same IMiD concomitantly with a standardized 3-week steroid rash prophylaxis protocol (prednisone at 10 mg daily for 10 days, followed by 5 mg daily for 10 days, followed by 5 mg on alternate days for 10 days). As a result, all patients were able to restart the same IMiD with none re-experiencing any dermatologic adverse effect afterward. Comparing to no-rash controls, there was no significant difference in PFS (0.13) or OS (p = 0.12) in multivariate regression model. Conclusions: Proposed 3-week corticosteroid regimen showed 100% success rate in reinstituting IMiDs in our cohort. It may provide a highly effective and practical short term immunosuppression required to enable patients to restart IMiDs and enjoy comparable outcome to pts without skin rash.
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7

Caracciolo, Daniele, Caterina Riillo, Giada Juli, Francesca Scionti, Katia Todoerti, Nicoletta Polerà, Katia Grillone, et al. "miR-22 Modulates Lenalidomide Activity by Counteracting MYC Addiction in Multiple Myeloma." Cancers 13, no. 17 (August 29, 2021): 4365. http://dx.doi.org/10.3390/cancers13174365.

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Background: MYC is a master regulator of multiple myeloma (MM) by orchestrating several pro-tumoral pathways, including reprograming of the miRNA transcriptome. MYC is also involved in the acquirement of resistance to anti-MM drugs, including immunomodulatory imide drugs (IMiDs). Methods: In silico analysis was performed on MM proprietary and on public MMRF-CoMMpass datasets. Western blot and chromatin immunoprecipitation (ChIP) experiments were performed to validate miR-22 repression induced by MYC. Cell viability and apoptosis assays were used to evaluate lenalidomide sensitization after miR-22 overexpression. Results: We found an inverse correlation between MYC and miR-22 expression, which is associated with poor outcome in IMiD-treated MM patients. Mechanistically, we showed that MYC represses transcription of miR-22, which, in turn, targets MYC, thus establishing a feed-forward loop. Interestingly, we found that IMiD lenalidomide increases miR-22 expression by reducing MYC repression and, most importantly, that the combination of lenalidomide with miR-22 mimics results in a synergistic direct and NK-mediated cytotoxic activity. Conclusions: Taken together, our findings indicate that: (1) low miR-22 expression could represent a potential predictive biomarker of poor lenalidomide response in MM patients; and (2) miR-22 reduces MYC oncogenic activity, thus triggering a novel synthetic lethality loop, which sensitizes MM cells to lenalidomide.
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8

Gemechu, Yohannes, David Millrine, Shigeru Hashimoto, Jaya Prakash, Ksenia Sanchenkova, Hozaifa Metwally, Parajuli Gyanu, Sujin Kang, and Tadamitsu Kishimoto. "Humanized cereblon mice revealed two distinct therapeutic pathways of immunomodulatory drugs." Proceedings of the National Academy of Sciences 115, no. 46 (October 29, 2018): 11802–7. http://dx.doi.org/10.1073/pnas.1814446115.

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Immunomodulatory drugs (IMiDs), including thalidomide derivatives such as lenalidomide and pomalidomide, offer therapeutic benefit in several hematopoietic malignancies and autoimmune/inflammatory diseases. However, it is difficult to study the IMiD mechanism of action in murine disease models because murine cereblon (CRBN), the substrate receptor for IMiD action, is resistant to some of IMiDs therapeutic effects. To overcome this difficulty, we generated humanized cereblon (CRBNI391V) mice thereby providing an animal model to unravel complex mechanisms of action in a murine physiological setup. In our current study, we investigated the degradative effect toward IKZF1 and CK-1α, a target substrate of IMiDs. Unlike WT mice which were resistant to lenalidomide and pomalidomide, T lymphocytes from CRBNI391V mice responded with a higher degree of IKZF1 and CK-1α protein degradation. Furthermore, IMiDs resulted in an increase in IL-2 among CRBNI391V mice but not in the WT group. We have also tested a thalidomide derivative, FPFT-2216, which showed an inhibitory effect toward IKZF1 protein level. As opposed to pomalidomide, FPFT-2216 and lenalidomide degrades CK-1α. Additionally, we assessed the potential therapeutic effects of IMiDs in dextran sodium sulfate (DSS)-induced colitis. In both WT and humanized mice, lenalidomide showed a significant therapeutic effect in the DSS model of colitis, while the effect of pomalidomide was less pronounced. Thus, while IMiDs’ degradative effect on IKZF1 and CK-1α, and up-regulation of IL-2, is dependent on CRBN, the therapeutic benefit of IMiDs in a mouse model of inflammatory bowel disease occurs through a CRBN–IMiD binding region independent pathway.
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9

Coto, Pablo, Sabino Riestra, Paloma Rozas, Ana Señaris, and Rubén Queiro. "Improving the standard of care for patients with spondyloarthritis-related immune inflammatory conditions: results of a Delphi study and proposal for early detection." Therapeutic Advances in Chronic Disease 11 (January 2020): 204062232090429. http://dx.doi.org/10.1177/2040622320904295.

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Background: Our objective was to provide consensus recommendations on the optimal management of the immune-mediated inflammatory diseases (IMIDs) seen in patients with spondyloarthritis (SpA) using a multidisciplinary approach, and to develop a simple tool to help earlier recognition and referral of coexisting IMIDs in patients who already have one type of IMID. Methods: A total of 28 experts in the multidisciplinary management of the SpA-associated IMIDs assessed two questionnaires: one with statements focused on the multidisciplinary management of IMIDs, and a second questionnaire focused on questions useful for early recognition and referral. Panelists assessed the statements with a 9-point ordinal scale (1 = strongly disagree, 9 = strongly agree) using a modified Delphi methodology. Results: Consensus was reached on 72 out of the 82 statements (87.8%). Panelists agreed that the multidisciplinary approach to IMIDs is not sufficiently developed. The creation of multidisciplinary IMID units might be necessary. These units might focus primarily on patients with two or more coexisting IMIDs, or on IMIDs that are especially complex from a diagnostic or therapeutic point of view. Specialists who attend to patients with IMIDs should perform a screening for other coexisting IMIDs. A simple tool to help earlier recognition and referral of coexisting IMIDs is proposed. Conclusions: There is a need to improve care for patients with SpA-associated IMIDs. We provide expert recommendations to guide the adoption of a multidisciplinary approach for these cases, and a simple tool that may be useful for earlier recognition of coexisting IMIDs.
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10

Olszewski, Adam J., Stacie Dusetzina, Amy J. Davidoff, and Amal N. Trivedi. "Closure of Medicare Part D coverage gap by the Affordable Care Act (ACA) and use of oral anti-myeloma agents." Journal of Clinical Oncology 35, no. 15_suppl (May 20, 2017): 6522. http://dx.doi.org/10.1200/jco.2017.35.15_suppl.6522.

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6522 Background: Medicare Part D pays for oral anti-myeloma immunomodulatory drugs (IMiDs, lenalidomide and thalidomide), but has a coverage gap resulting in an out-of-pocket (OOP) expense of > $ 3000 for the 1st prescription (Rx). Patients (pts) eligible for Low Income Subsidies (LIS) are exempt from cost sharing, and LIS is associated with IMiD receipt ( Olszewski, ASH 2016). In 2011, the ACA partly closed the coverage gap with a 50% manufacturer discount on the price of brand-name drugs within the gap. We examined effects of this policy on IMiD use. Methods: From the Surveillance, Epidemiology, and End Results (SEER)-Medicare database, we selected Part D enrollees who started anti-myeloma chemotherapy in 2008-2012. We identified IMiD use in periods pre-ACA (2008-10) and post-ACA (2011-12), among pts with or without LIS. After confirming parallel trends in IMiD use before the ACA, we examined the effect of ACA discount on IMiD use in a difference-in-differences (DiD) model, using LIS recipients as controls whose OOP costs were not influenced by the ACA. Results: Among 3,313 Part D enrollees (of whom 31% received LIS), 41% received IMiDs as part of their anti-myeloma regimen. Compared with the pre-ACA period, in the post-ACA period the median gross IMiD cost of the 1st Rx increased for all pts (Table). OOP costs for the 1st Rx, and for the 1st year of IMiD therapy, decreased for LIS non-recipients. Proportion of pts entering catastrophic coverage with their 1st IMiD Rx decreased from 71% to 49%. However, there was no statistically significant effect of the ACA discount on the proportion of pts treated with IMiDs (DiD estimator, 3% [95%CI, -4 to 10]; P=.40), or on the time from diagnosis to 1st Rx (median 1.5 mo. in all groups). Conclusions: The ACA-mandated partial closure of coverage gap lowered the OOP costs for Part D enrollees treated with IMiDs. As the median OOP cost remains > $2400 for the 1st Rx, and > $4900 for the 1st year of therapy, the policy may be insufficient to overcome the financial barrier for beneficiaries who do not receive the LIS. [Table: see text]
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Dissertations / Theses on the topic "Imidy"

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Rzycka-Korzec, Roksana. "Projektowanie i synteza pochodnych imidów aromatycznych o potencjalnych zastosowaniach w farmacji lub optoelektronice." Doctoral thesis, Katowice : Uniwersytet Śląski, 2020. http://hdl.handle.net/20.500.12128/16085.

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The purpose of this study was to design and synthesize aromatic imides as potential active fragments of new drugs and materials for organic electronics. The first group of tested compounds was formed by conjugating naphthalic or phthalic fragment with thiosemicarbazone containing unsaturated six-membered rings of piperidine, piperazine and morpholine. The second group was iminaphthalimides obtained by introducing aliphatic or aromatic substituents into the imide part and forming an imine bond located in position 3 of the 1,8-naphthalimide core by the condensation of amines with salicylaldehydes. As a part of this study, 51 compounds were obtained and tested. Following subgroups of these compounds can be indicated: naphthaltiosemiimides (NITs), naphthaltiosemidiimides (NDITs), pyromellitithiosemidiimides (PMITs), 3-nitronaphthalimides (3-NNI), 3-aminonaphthalimides and iminonaphthalimides (ImNI). Chemical structure of the obtained compounds was determined using the ¹H and ¹³C NMR method, while purity was determined by elemental analysis. The physico-chemical and biological tests were performed for the compounds obtained to allow the structure-activity (property) study. Thiosemicarbazones (NITs, NDITs, PMITs) were tested for their complexing capability vs. various metal ions as well as biological activity against the HCT 116p53+/+; HCT 116p53 -/- colorectal and MCF-7 breast cancer cell lines. The study showed a reduction in the ability to complex Cu2+ and Fe3+ by NITs compared to biologically active TSc analogues. This could be explained by the steric hindrance in the imide part. In addition, no cytotoxic properties of these compounds have been demonstrated for the tumor lines tested. However, for imine derivatives (ImNI) the basis characteristics were performed in relation to the measured properties: thermal (TGA, DSC), electrochemical (CV), optical (UV-Vis and PL) in solution and solid (layers or blends). This specifies a potential for the application of these compounds in organic electronics. Electroluminescence (EL) was tested in OLED diodes, where the compound played a role of a layer or a component with PVK:PBD. The best electroluminescent properties both alone and in a form of a component from PVK: PBD was shown by compound ImNI 3a in a weight content of 2%. In addition, due to the lack of cytotoxicity of ImNI to HCT 116, these compounds were also tested for their potential use as fluorescent dyes in bioimaging. These studies showed that both 3-ANI 1 and ImNI: 1a, 1b can be successfully used for imaging live cells. In turn, studies on sublocation of ImNI 1b showed that the compound stains the mitochondria and endoplasmic reticulum. The conducted research allowed us to determine the usefulness of the novel compounds in pharmacy and organic electronics.
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Battirola, Liliane Cristina. "Estruturas grafitizadas e nanocompósitos a base de Poli(imida)/argila organomodificada: síntese, caracterizações e aplicações." Universidade de São Paulo, 2012. http://www.teses.usp.br/teses/disponiveis/75/75134/tde-09042013-090507/.

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Neste trabalho, materiais nanocompósitos de poli(imida) (PI) derivada de BTDA-pFDA-Mel e argila do tipo montmorilonita, organicamente modificada (O-MMT), foram sintetizados usando a metodologia de two-steps. O componente inorgânico do nanocompósito foi adicionado nas concentrações de 3,3, 5,3 e 8,3% em massa. As membranas sintetizadas foram caracterizadas por Espectroscopia de Absorção na Região do Infravermelho com Transformada de Fourrier (FTIR), Difração de Raio X (DRX), Termogravimetria (TG), Espectroscopia de Fotoelétrons Excitados por Raio X (XPS) e Microscopias Ótica (MO), Eletrônica de Varredura (MEV) e de Transmissão (MET). Os resultados comprovam a formação de PI e uma estrutura de nanocompósito do tipo intercalado, onde a cadeia polimérica expulsa o surfactante do espaço interlamelar; além de apresentar estruturas de argila parcialmente esfoliadas. Os materiais sintetizados foram avaliados como polieletrólito em célula a combustível alcalina (Alkaline Fuel Cell - AFC), obtendo condutividades iônicas em torno de 0,032 S cm-1 e de 0,017 S cm-1 para as membranas de PI pura e de nanocompósito com 3,3% de argila em massa, respectivamente, ambas a 60 °C, as quais são na ordem ou até mesmo superior que os polieletrólitos comercias (Tokuyama®, 0,014 S cm-1) para eletrólito alcalino. Apesar de condutividades razoáveis, a performance obtida para as AFCs em operação não foram satisfatórias, desta forma, membranas de nanocompósitos com PI de cadeia principal de maior mobilidade foram sintetizadas, caracterizadas e avaliadas nas AFCs. Ademais, neste segundo nanocompósito, a adição de grupamentos amino na cadeia principal foram realizados para aumentar a condutividade iônica. Assim, este segundo material apresentou uma maior performance nas AFCs quando comparado com o nanocompósito de PI de cadeia mais rígida e com a membrana comercial Tokuyama® nas mesmas condições. Além disso, a carbonização superficial das amostras foi realizada por meio de tratamento térmico. A formação de estruturas grafitizadas nos materiais de PI pura e dos nanocompósitos foram investigadas por FTIR, DRX, TG, XPS e EPR. Foi encontrado que a formação de estruturas do tipo grafite nas amostras ocorrem principalmente nas primeiras camadas (grafitização superficial), preservando a estrutura interna da poli(imida). Com isso, estruturas poliméricas ou nanocompósitos com superfícies grafitizadas podem atuar tanto como polieletrólitos e ser um caminho promissor para o desenvolvimento de arranjos eletrodo-membrana (Membrane Electrode Assembly - MEA) mais eficientes para células a combustíveis alcalinas, como em processos de catálise heterogênea e processos de separação com membranas.
In this work, Poli(imide)/clay (PI/clay) nanocomposite membranes were synthesized by employing a two-steps method using organically modified montmorillonite clay (O-MMT) with different amounts of O-MMT loading (3.3, 5.3 and 8.3 wt.%). Fourier transform infrared spectroscopy (FTIR), X-ray power diffraction (XRD), thermogravimetric analysis (TG), X-ray photoelectron spectroscopy (XPS), optical microscopy (OM), scanning electron microscope (SEM) and transmission electron microscopy (TEM) measurements, confirmed the formation of pure PI and intercalated-nanocomposite structures. The results revealed parallel clay layers with interlamellar PI and some organoclay partially exfoliated. In addition, the polyelectrolyte membranes of PI and PI/O-MMT (3.3 wt.%) showed that the ionic conductivity were 2- and 1-fold, respectively, higher than that of commercial membrane (Tokuyama®, 0.014 S cm-1), in alkaline fuel cells (AFC) at 60 °C. Despite the fact that the membranes of pure PI and PI/O-MMT demonstrated a good degree of ionic conductivity, rapid fuel cell performance deactivation occurred for the temperature higher than 75 °C. Furthermore, the lack of prepared polyelectrolyte ionic groups, led us to consider alternative synthesis of PI/clay nanocomposite membranes. Thus, the performance for second polyelectrolyte was superior when compared to pure PI, PI/O-MMT and commercial Tokuyama® membranes at same conditions. Moreover, the samples were also surface carbonized by thermal treatment. Combining FTIR, XRD, TG, XPS and electron paramagnetic resonance (ESR) analysis, the results suggested that graphitized nanostructures formation occurred mainly on the surface, maintaining the PI bulk structure. Therefore, graphitized PI/clay membranes may act as one promising way for enhancing both membrane electrode assembly in alkaline fuel cells and gas separation or catalysis.
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Angelo, Ulisses Fiorin. "Imidas naftálicas e piromelíticas dissubstituídas como ligantes para complexos de metais de transição \'\'d\'\' com potencial aplicação em redes de coordenação metal-orgânicas." Universidade de São Paulo, 2017. http://www.teses.usp.br/teses/disponiveis/59/59138/tde-10062017-153532/.

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As imidas naftálicas (INs) compõe uma classe de moléculas orgânicas aromáticas derivadas, geralmente, de um anidrido naftálico e uma amina primária. São de grande interesse na área de materiais devido a uma série de propriedades físicas e químicas, mas principalmente devido à suas propriedades fotofísicas. Derivados de INs são compostos fluorescentes com propriedades fotofísicas interessantes como fotoestabilidade, emissão de fluorescência variável (dependendo dos ligantes, pH, temperatura e solvente), solvatocromismo e halocomismo. O estudo de compostos de coordenação formados por imidas naftálicas e metais de transição abre um leque interessante no que tange a pesquisa e desenvolvimento de novos materiais. Esta tese descreve a síntese da imida 4-amino-N-piridina-1,8-naftalimida (NF2), da diimida N,N\'-Bis-(4-piridil)piromelítica (DI1), a determinação dos valores de pKa (2,75 e 3,49), absortividade molar (3537 L.mol-1.cm-1), efeito solvatocrômico (positivo) e rendimento quântico (0,27) de NF2; absortividade molar (18246 L.mol-1.cm-1) e solvatocromismo negativo para DI1. Foram sintetizados compostos de coordenação entre o ligante DI1 e os íons Fe3+; Ru3+ e Co2+, porém a formação de complexos com o ligante NF2 não foi observada por meio das técnicas aplicadas
Naphthalic imides (INs) comprise a class of aromatic organic molecules generally derived from a naphthalic anhydride and primary amine. They are of great interest in the field of materials chemistry due to a number of physical and chemical properties, but mainly to their photophysical properties. Derivatives of INs are fluorescent compounds with several interesting photophysical properties such as photostability, variable fluorescence emission (depending on ligands, pH, temperature and solvent), solvatochromism and halochromism. The study of coordination compounds formed between naphthalic imides and transition metals opens up an interesting range of research and development of new materials. This thesis describes the synthesis of 4-amine-N-pyridine-1,8-naphthalimide (NF2) and N, N\'-Bis- (4-pyridyl) pyromellitic diimide (DI1) , measurement of pKa values (2.75 and 3.49), molar absorptivity (3537 L:mol1:cm1), solvatochromic e_ect (positive) and quantum yield (0.27) of NF2; Molar absorptivity (18246 L.mol-1.cm-1) and solvatochromic efect (negative) for DI1. Coordination compounds with DI1 and Fe3+; Ru3+ and Co2+ ions were synthesized; but complexes with NF2 was not observed by the applied techniques
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Souza, Eliseu William de. "Estudo para fabricação de refletores automobilísticos utilizando um material compósito termofixo e um material termoplástico." Universidade de São Paulo, 2010. http://www.teses.usp.br/teses/disponiveis/85/85134/tde-08082011-102352/.

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Na montagem de um farol automobilístico são utilizados diversos materiais, tais como insertos metálicos nas fixações, vidros nas lâmpadas, materiais poliméricos nas lentes, carcaças, molduras, vedações e refletores, além de vernizes, tintas, película de metal para reflexão do feixe luminoso. Há cerca de quatro décadas foi iniciada a confecção dos refletores utilizando o BMC (bulk moulding compound), sigla em inglês para composto para moldagem em forma de massa, que é um compósito polimérico termofixo. Este material apresenta inúmeras vantagens sobre o metal, tal como forma e geometria que podem se integrar facilmente ao desenho do carro, elevada produtividade, baixo custo e da elevada resistência térmica. Contudo, apresentam o inconveniente de não poderem ser reciclados. Uma opção ao BMC tem sido o PEI [poli (éter imida)], que é um material polimérico termoplástico de alto desempenho que apresenta propriedades atrativas para essa utilização. Oferece também elevada produtividade, porém com um custo elevado se comparado ao BMC. Tem a vantagem de pode ser reciclado. De modo a analisar o potencial dos dois materiais e extrair deles suas vantagens competitivas, bem como determinar suas possíveis limitações, o presente trabalho apresenta os resultados de caracterização mecânica, análise térmica, ensaios de impacto, ensaios de temperatura de deflexão térmica (HDT) e reaproveitamento de resíduos de BMC, incorporando-o ao PVC [poli (cloreto de vinila)], resultando uma nova blenda polimérica. O estudo conclui que ambos os materiais podem ser utilizados para fabricação de refletores automobilísticos. No entanto, o preço do PEI é maior que o do BMC, o que desestimula sua utilização em produtos de alta escala de produção, como, por exemplo, o produto do presente trabalho. O BMC por sua vez não pode ser reciclado, exigindo um custo adicional para seu reaproveitamento de maneira a evitar seu descarte em aterro sanitário.
For assembly of an automobile headlight a lot of materials are used such as metallic inserts anchors, glass in the lamps, lens of polymeric materials, bezels, frames, fences and reflectors as well as paints, metallic sheet for reflection of the luminous beam. About four decades ago begun the manufacturing of BMC reflectors, which is a thermoset composite material. This material presents countless advantages on the metal, such as shape and geometry that can easily integrate the designing of cars, high productivity, low cost and high heat resistance. However, they have the disadvantage of not being able to be recycled. An option to the BMC has been the PEI [poly (ether imide)], which is a high performance polymeric thermoplastic material which brings attractive properties for the production of reflectors. It also offers high productivity, however with a high cost compared to BMC. It also has the advantage of being recycled. In order to analyze the potential of both materials and extract their competitive advantages, as well as determine their possible limitations, this study presents the results of mechanical characterization, thermal analysis, impact tests, tests on heat deflection temperature (HDT) and the reuse of BMC waste, incorporating it to PVC [poly (vinyl chloride)], resulting in a new polymeric blend. The study concludes that both materials can be used for manufacturing automobile reflectors. However, the price of PEI is higher than the one of BMC, which discourages their use in high-scale production products, as the one of this work. The BMC for your time can not be recycled, demanding an extra cost for their reuse, avoiding its disposal in landfill.
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Barbarini, Fernando de Lucca. "Membranas de peneira molecular de carbono obtidas pela pirólise de poli(imidas) ramificadas." Universidade de São Paulo, 2010. http://www.teses.usp.br/teses/disponiveis/75/75131/tde-26072010-093355/.

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Nesse trabalho obtiveram-se membranas de poli(imida) ramifricada com tamanho de poro ajustável usando melamina como agente de ramificação e indutor da formação de poros. Estas poli(imidas) foram sulfonadas usando-se ácido sulfúrico concentrado eficazmente. Finalmente, obtivemos membranas de carbono molecular por pirólise sob atmosfera inerte das poli(imidas) ramificadas. Estas membranas apresentam canais micrométricos paralelos à superfície e uma estrutura assimétrica constituída de uma camada densa filtrante e uma camada com canais micrométricos paralelos à superfície altamente ordenados. A membrana apresentou boa estabilidade química frente ao ataque por radicais hidroxila gerados via reação de Fenton.
In this work was obtained branched poly(imides) with tuned pore size using melamine as branching and pore induction agent. The poly(imides) with were efficiently sulfonated with concentrated sulfuric acid. Finally, the molecular sieve carbon membranes were obtained by pyrolysis under inert atmosphere of the branched poly(imides). These membranes have an asymmetric structure with a dense filtering layer and a porous layer with highly ordered channels standing parallel to the surface. These membranes display good chemical stability toward hydroxyl radical attack produced by Fenton reaction.
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Dunn, Simon Charles. "New titanium imido complexes." Thesis, University of Nottingham, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.320787.

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Bláhová, Petra. "Imidž značky Kérastase Paris." Master's thesis, Vysoká škola ekonomická v Praze, 2014. http://www.nusl.cz/ntk/nusl-192371.

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The aim of the diploma thesis is to determine a perception of the brand Kérastase Paris by consumers in Czech republic and Slovakia and compare it with the identity of the brand. I want to expose consumer habbits in the field of hair care and find out opinion about marketing communication of the brand Kérastase, that is supposed to correspondent with the brand strategy. I also want to expose main characteristics of loyal customer of the brand and propose some marketing recommendation for the brand Kérastase Paris.
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Walker, Gary Lawrence Patrick. "Studies in imido molybdenum chemistry." Thesis, Imperial College London, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.266639.

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Humphries, Martin J. "Studies in niobium imido chemistry." Thesis, University of Oxford, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.302068.

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Forster, Glyn Daniel. "Dithiocarbamate stabilised molybdenum imido complexes." Thesis, University College London (University of London), 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.261809.

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Books on the topic "Imidy"

1

Pietro, Profita P. Imerina-Imady. Fianarantsoa [Madagascar]: Baingan' Ambozontany, 1997.

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Vučić, Tanja. Identitet i imidž Brotnja. Čitluk: Matica hrvatska, 2010.

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Challiner, John Francis. Photochemistry of imide mannich bases. Wolverhampton: The Polytechnic, Wolverhampton, Department of Physical Sciences, 1985.

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Zia, Shahzad. Polymer blends of polycarbonate and poly(ether imide). Birmingham: University of Birmingham, 1997.

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Spahić, Besim. Imidž grada: Uvod u marketinško promišljanje grada kao proizvoda. Sarajevo: Međunarodni centar za mir, 2001.

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Mouledous, Gerard. Thermal and mechanical properties of poly (ether imide) (PEI) and poly (ether ether ketone) (PEEK) blends. Birmingham: University of Birmingham, 1991.

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Nugent, William A. Metal-ligandmultiple bonds: The chemistry of transition metal complexes containing oxo, nitrido, imido, alkylidene, or alkylidyne ligands. New York: Wiley, 1988.

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Sundermeyer, Jörg. The bonding capability of imido complex fragments of groups 5-7 with regard to the isolobal relationship. Weinheim: Verlag Chemie, 1994.

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Nugent, William A. Metal-ligand multiple bonds: The chemistry of transition metal complexes containing oxo, nitrido, imido, alkylidene, or alkylidyne ligands. New York: Wiley, 1988.

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Štal', Chenrike. Imidž, dialog, eksperiment - polja sovremennoj russkoj poezii : (Image, Dialog, Experiment - Felder der russischen Gegenwartsdichtung. Herausgegeben von Henrieke Stahl und Marion Rutz). Bern: Peter Lang International Academic Publishers, 2013.

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Book chapters on the topic "Imidy"

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Ahmad, Zulkifli. "Polyamide Imide." In Handbook of Engineering and Specialty Thermoplastics, 11–42. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2011. http://dx.doi.org/10.1002/9781118229064.ch2.

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Becke-Goehring, Margot, Ekkehard Fluck, Amedeo Failli, and Therald Moeller. "Heptasulfur Imide." In Inorganic Syntheses, 103–5. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2007. http://dx.doi.org/10.1002/9780470132395.ch26.

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Singla, Abhishek, and Shaji Kumar. "Newer IMiDs." In Advances in Biology and Therapy of Multiple Myeloma, 181–213. New York, NY: Springer New York, 2012. http://dx.doi.org/10.1007/978-1-4614-5260-7_8.

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Gooch, Jan W. "Polyester Imide." In Encyclopedic Dictionary of Polymers, 557. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_9041.

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Gooch, Jan W. "Polyether Imide." In Encyclopedic Dictionary of Polymers, 558. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_9056.

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Gooch, Jan W. "Alkane-Imide Resin." In Encyclopedic Dictionary of Polymers, 27. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_435.

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Gooch, Jan W. "Amide-Imide Resin." In Encyclopedic Dictionary of Polymers, 33. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_545.

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Hussey, Bob, and Jo Wilson. "Imide-Based Adhesives." In Structural Adhesives, 235–40. Boston, MA: Springer US, 1996. http://dx.doi.org/10.1007/978-1-4613-1203-1_20.

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Gooch, Jan W. "Polyamide-Imide Resin." In Encyclopedic Dictionary of Polymers, 551. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_8957.

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Gooch, Jan W. "Polyamide-Imide Resins." In Encyclopedic Dictionary of Polymers, 551. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_8958.

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Conference papers on the topic "Imidy"

1

Ponnampalam, N., M. M. Pai, T. J. Clement, H. T. Nguyen, and R. G. DeCorby. "Polyamide-imide Films for Integrated Photonics." In Frontiers in Optics. Washington, D.C.: OSA, 2005. http://dx.doi.org/10.1364/fio.2005.stha4.

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Couture, Axel, Eric Deniau, Pierre Grandclaudon, and Marc Lamblin. "First Total Synthesis of Narceine Imide." In The 10th International Electronic Conference on Synthetic Organic Chemistry. Basel, Switzerland: MDPI, 2006. http://dx.doi.org/10.3390/ecsoc-10-01386.

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Zakaria, Nurhanani. "Charging Reduction Method for Auger Analysis on Imide Surface." In ISTFA 2016. ASM International, 2016. http://dx.doi.org/10.31399/asm.cp.istfa2016p0502.

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Abstract This paper outlines a method that has been found to effectively reduce the charging effect on imide surfaces during Auger analysis. This methodology enables in-house Auger analysis on insulators in the semiconductor industry. The compositional analysis at the imide surface is as critical as analysis at the bond pad surface due to its impact on the reliability of the product. Current practice is the use of a thin Au/Pd coating to reduce the charging effect, but there are some drawbacks such as the creation of artifacts due to the presence of Au/Pd peaks in the spectrum. Apart from that, the signal to noise ratio (S/N) is reduced, masking the desired signal. When this scenario occurs, we implement a new combination method of a low angle incident beam along with special sample preparation. This method provides a spectrum with good S/N and no charging effects and eliminates the Au/Pd peak artifacts.
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Yu Xia, Cheng Zhou, We Wang, Xueping Wen, Shaobo He, and William Chen. "Developing a novel environmental friendly polyester-imide impregnating resin." In 2015 IEEE Electrical Insulation Conference. IEEE, 2015. http://dx.doi.org/10.1109/icacact.2014.7223558.

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Bacosca-Butnaru, Irina, Elena Hamciuc, and Maria Bruma. "Poly(amide-imide)s for potential nano-actuation applications." In 2012 International Semiconductor Conference (CAS 2012). IEEE, 2012. http://dx.doi.org/10.1109/smicnd.2012.6400771.

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Diaham, S., M. L. Locatelli, T. Lebey, and S. Dinculescu. "Dielectric and thermal properties of Polyamide-imide (PAI) films." In 2009 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP). IEEE, 2009. http://dx.doi.org/10.1109/ceidp.2009.5377778.

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Beatrice, Cesar A. G., Amanda D. Oliveira, Fabio R. Passador, and Luiz A. Pessan. "Sulfonated poly(ether imide)/aluminium nanocomposites for hydrogen storage." In PROCEEDINGS OF THE REGIONAL CONFERENCE GRAZ 2015 – POLYMER PROCESSING SOCIETY PPS: Conference Papers. Author(s), 2016. http://dx.doi.org/10.1063/1.4965495.

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Bialecka-Florjanczyk, Ewa, A. Orzeszko, Irma Sledzinska, and N. Sadlej-Sosnowska. "Mesomorphism of ester imide derivatives containing two phenyl groups." In XIII International Conference on Liquid Crystals: Chemistry, Physics, and Applications, edited by Stanislaw J. Klosowicz, Jolanta Rutkowska, Jerzy Zielinski, and Jozef Zmija. SPIE, 2000. http://dx.doi.org/10.1117/12.385703.

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Wang, Long-De, Tong Zhang, Xiao-Yang Zhang, Ruo-Zhou Li, Lu-Ning Wang, and Sheng-Qing Zhu. "Study on the synthesis and optical properties of polyurethane-imide." In 6th International Symposium on Advanced Optical Manufacturing and Testing Technologies (AOMATT 2012), edited by Li Yang, Eric Ruch, and Shengyi Li. SPIE, 2012. http://dx.doi.org/10.1117/12.976045.

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Sun, J., D. R. MacFarlane, and M. Forsyth. "HYDROXIDE-DOPED PLASTICAL CRYSTAL ELECTROLYTES BASED ON PYRROLIDINIUM IMIDE SALTS." In Proceedings of the 7th Asian Conference. WORLD SCIENTIFIC, 2000. http://dx.doi.org/10.1142/9789812791979_0105.

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Reports on the topic "Imidy"

1

Sharp, P. R. Late transition metal oxo and imido complexes. Office of Scientific and Technical Information (OSTI), December 1992. http://dx.doi.org/10.2172/7017245.

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Sharp, P. R. Late transition metal. mu. -oxo and. mu. -imido complexes. Office of Scientific and Technical Information (OSTI), January 1990. http://dx.doi.org/10.2172/6332549.

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Sharp, P. Late transition metal. mu. -oxo and. mu. -imido complexes. Office of Scientific and Technical Information (OSTI), January 1990. http://dx.doi.org/10.2172/7003275.

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Allred, Ronald E., Richard E. Jensen, Thomas A. Donnellan, Theotis Williams, and Jr. Fiber Finishes for Improving Galvanic Resistance of Imide-Based Composites. Fort Belvoir, VA: Defense Technical Information Center, February 1998. http://dx.doi.org/10.21236/ada341614.

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Archer, D. G. Thermodynamic properties of 1-hexyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide. Gaithersburg, MD: National Institute of Standards and Technology, 2006. http://dx.doi.org/10.6028/nist.ir.6645.

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Sharp, P. R. Late transition metal oxo and imido complexes. Progress report, May 15 1992--May 14, 1992. Office of Scientific and Technical Information (OSTI), December 1992. http://dx.doi.org/10.2172/10102788.

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Sharp, P. R. Late transition metal. mu. -oxo and. mu. -imido complexes: Progress report, May 15, 1988--May 14, 1989. Office of Scientific and Technical Information (OSTI), January 1989. http://dx.doi.org/10.2172/6262903.

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