Base de dados : MEDLINE
Pesquisa : D01.268.549 [Categoria DeCS]
Referências encontradas : 618 [refinar]
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[PMID]:28641222
[Au] Autor:Tang H; Duan Y; Zhu C; Cai T; Li C; Cai L
[Ad] Endereço:Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University, Nanjing, Jiangsu 210096, China.
[Ti] Título:Theoretical evaluation on selective adsorption characteristics of alkali metal-based sorbents for gaseous oxidized mercury.
[So] Source:Chemosphere;184:711-719, 2017 Oct.
[Is] ISSN:1879-1298
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:Alkali metal-based sorbents are potential for oxidized mercury (Hg ) selective adsorption but show hardly effect to elemental mercury (Hg ) in flue gas. Density functional theory (DFT) was employed to investigate the Hg and HgCl adsorption mechanism over alkali metal-based sorbents, including calcium oxide (CaO), magnesium oxide (MgO), potassium chloride (KCl) and sodium chloride (NaCl). Hg was found to weakly interact with CaO (001), MgO (001), KCl (001) and NaCl (001) surfaces while HgCl was effectively adsorbed on top-O and top-Cl sites. Charge transfer and bond population were calculated to discuss the covalency and ionicity of HgCl bonding with the adsorption sites. The partial density of states (PDOS) analysis manifests that HgCl strongly interacts with surface sites through the orbital hybridizations between Hg and top O or Cl. Frontier molecular orbital (FMO) energy and Mulliken electronegativity are introduced as the quantitative criteria to evaluate the reactivity of mercury species and alkali metal-based sorbents. HgCl is identified as a Lewis acid and more reactive than Hg . The Lewis basicity of the four alkali metal-based sorbents is predicted as the increasing order: NaCl < MgO < KCl < CaO, in consistence with the trend of HgCl adsorption energies.
[Mh] Termos MeSH primário: Mercúrio/química
Metais Alcalinos/química
Modelos Químicos
[Mh] Termos MeSH secundário: Adsorção
Compostos de Cálcio
Gases
Óxido de Magnésio
Cloreto de Mercúrio
Compostos de Mercúrio
Óxidos
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Calcium Compounds); 0 (Gases); 0 (Mercury Compounds); 0 (Metals, Alkali); 0 (Oxides); 3A3U0GI71G (Magnesium Oxide); 53GH7MZT1R (Mercuric Chloride); C7X2M0VVNH (lime); FXS1BY2PGL (Mercury); IY191986AO (mercuric oxide)
[Em] Mês de entrada:1710
[Cu] Atualização por classe:171010
[Lr] Data última revisão:
171010
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170623
[St] Status:MEDLINE


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[PMID]:28118572
[Au] Autor:Thompson JJ; Pacquette LH
[Ad] Endereço:Abbott Nutrition, 3300 Stelzer Rd, Columbus, OH 43219.
[Ti] Título:Characterization of Final Action 2011.19 and First Action 2015.06 Performance at Analyte Levels Corresponding to CODEX STAN 72 (1981) Minimum Levels.
[So] Source:J AOAC Int;100(2):522-531, 2017 Mar 01.
[Is] ISSN:1060-3271
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:A limited single-laboratory validation (SLV) was conducted in the authors' laboratory to investigate the performance of AOAC Official MethodsSM 2011.19 Determination of Chromium (Cr), Selenium (Se), and Molybdenum (Mo) in Infant Formula and Adult Nutritional Products by Inductively Coupled Plasma/Mass Spectrometry and 2015.06 Determination of Minerals and Trace Elements in Infant Formula and Adult/Pediatric Nutritional Formula by Inductively Coupled Plasma/Mass Spectrometry at analyte levels below the practical LOQs (PLOQs) already published for these Final Action Official Methods. This work was needed to verify that the actual LOQs were below the minimum requirements for minerals in infant formula as given in CODEX STAN 72 (1981). Linearity studies at low levels were conducted as well as the analysis of blanks over multiple days to establish the LOQs (as opposed to PLOQs) for these nutrients. Several placebo matrixes from the AOAC Stakeholder Panel on Infant Formula and Adult Nutritionals (SPIFAN) program were tested over multiple days at two different sample sizes to quantitate the effect of doubling the sample size given in the original publications. The SLV results indicate that both methods can meet the Codex minimum requirements as-is, without modification of the methods, albeit with a relaxation of the stringent precision criteria originally established for these methods by SPIFAN. Precision can be improved by doubling the sample size, but this step is not necessary to use the method for its intended purpose. A concurrent collaborative study of Method 2015.06 showed that the RSDR obtained across eight laboratories for several infant formula placebos containing mineral concentrations between the PLOQ and LOQ were indeed worse than SPIFAN expectations, but reasonable Horwitz ratios (HorRat) were nonetheless obtained for these analytes.
[Mh] Termos MeSH primário: Fórmulas Infantis/análise
[Mh] Termos MeSH secundário: Cromo/análise
Seres Humanos
Fórmulas Infantis/normas
Metais Alcalinos/análise
Metais Alcalinoterrosos/análise
Molibdênio/análise
Fósforo/análise
Selênio/análise
[Pt] Tipo de publicação:JOURNAL ARTICLE; VALIDATION STUDIES
[Nm] Nome de substância:
0 (Metals, Alkali); 0 (Metals, Alkaline Earth); 0R0008Q3JB (Chromium); 27YLU75U4W (Phosphorus); 81AH48963U (Molybdenum); H6241UJ22B (Selenium)
[Em] Mês de entrada:1706
[Cu] Atualização por classe:170606
[Lr] Data última revisão:
170606
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170125
[St] Status:MEDLINE
[do] DOI:10.5740/jaoacint.16-0325


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[PMID]:28084076
[Au] Autor:Wang J; Kingsbury RS; Perry LA; Coronell O
[Ad] Endereço:Department of Environmental Sciences and Engineering, Gillings School of Global Public Health, University of North Carolina at Chapel Hill , Chapel Hill, North Carolina 27599-7431, United States.
[Ti] Título:Partitioning of Alkali Metal Salts and Boric Acid from Aqueous Phase into the Polyamide Active Layers of Reverse Osmosis Membranes.
[So] Source:Environ Sci Technol;51(4):2295-2303, 2017 Feb 21.
[Is] ISSN:1520-5851
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:The partition coefficient of solutes into the polyamide active layer of reverse osmosis (RO) membranes is one of the three membrane properties (together with solute diffusion coefficient and active layer thickness) that determine solute permeation. However, no well-established method exists to measure solute partition coefficients into polyamide active layers. Further, the few studies that measured partition coefficients for inorganic salts report values significantly higher than one (∼3-8), which is contrary to expectations from Donnan theory and the observed high rejection of salts. As such, we developed a benchtop method to determine solute partition coefficients into the polyamide active layers of RO membranes. The method uses a quartz crystal microbalance (QCM) to measure the change in the mass of the active layer caused by the uptake of the partitioned solutes. The method was evaluated using several inorganic salts (alkali metal salts of chloride) and a weak acid of common concern in water desalination (boric acid). All partition coefficients were found to be lower than 1, in general agreement with expectations from Donnan theory. Results reported in this study advance the fundamental understanding of contaminant transport through RO membranes, and can be used in future studies to decouple the contributions of contaminant partitioning and diffusion to contaminant permeation.
[Mh] Termos MeSH primário: Nylons/química
Sais
[Mh] Termos MeSH secundário: Ácidos Bóricos
Membranas Artificiais
Metais Alcalinos
Osmose
Purificação da Água
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Boric Acids); 0 (Membranes, Artificial); 0 (Metals, Alkali); 0 (Nylons); 0 (Salts)
[Em] Mês de entrada:1706
[Cu] Atualização por classe:170609
[Lr] Data última revisão:
170609
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170114
[St] Status:MEDLINE
[do] DOI:10.1021/acs.est.6b04323


  4 / 618 MEDLINE  
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[PMID]:27638458
[Au] Autor:Kang F; Wang Q; Shou W; Collins CD; Gao Y
[Ad] Endereço:Institute of Organic Contaminant Control and Soil Remediation, College of Resources and Environmental Sciences, Nanjing Agricultural University, Jiangsu 210095, China.
[Ti] Título:Alkali-earth metal bridges formed in biofilm matrices regulate the uptake of fluoroquinolone antibiotics and protect against bacterial apoptosis.
[So] Source:Environ Pollut;220(Pt A):112-123, 2017 Jan.
[Is] ISSN:1873-6424
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:Bacterially extracellular biofilms play a critical role in relieving toxicity of fluoroquinolone antibiotic (FQA) pollutants, yet it is unclear whether antibiotic attack may be defused by a bacterial one-two punch strategy associated with metal-reinforced detoxification efficiency. Our findings help to assign functions to specific structural features of biofilms, as they strongly imply a molecularly regulated mechanism by which freely accessed alkali-earth metals in natural waters affect the cellular uptake of FQAs at the water-biofilm interface. Specifically, formation of alkali-earth-metal (Ca or Mg ) bridge between modeling ciprofloxacin and biofilms of Escherichia coli regulates the trans-biofilm transport rate of FQAs towards cells (135-nm-thick biofilm). As the addition of Ca and Mg (0-3.5 mmol/L, CIP: 1.25 µmol/L), the transport rates were reduced to 52.4% and 63.0%, respectively. Computational chemistry analysis further demonstrated a deprotonated carboxyl in the tryptophan residues of biofilms acted as a major bridge site, of which one side is a metal and the other is a metal girder jointly connected to the carboxyl and carbonyl of a FQA. The bacterial growth rate depends on the bridging energy at anchoring site, which underlines the environmental importance of metal bridge formed in biofilm matrices in bacterially antibiotic resistance.
[Mh] Termos MeSH primário: Antibacterianos/metabolismo
Apoptose/efeitos dos fármacos
Biofilmes
Escherichia coli/efeitos dos fármacos
Escherichia coli/metabolismo
Fluoroquinolonas/metabolismo
Metais Alcalinos/farmacologia
[Mh] Termos MeSH secundário: Antibacterianos/farmacocinética
Biodegradação Ambiental/efeitos dos fármacos
Ciprofloxacino/metabolismo
Ciprofloxacino/farmacocinética
Fluoroquinolonas/farmacocinética
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Anti-Bacterial Agents); 0 (Fluoroquinolones); 0 (Metals, Alkali); 5E8K9I0O4U (Ciprofloxacin)
[Em] Mês de entrada:1703
[Cu] Atualização por classe:170817
[Lr] Data última revisão:
170817
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:160918
[St] Status:MEDLINE


  5 / 618 MEDLINE  
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[PMID]:27368164
[Au] Autor:Kotynska J; Dobrzynska I; Figaszewski ZA
[Ad] Endereço:Institute of Chemistry, University of Bialystok, Ciolkowskiego 1K, 15-245, Bialystok, Poland. joannak@uwb.edu.pl.
[Ti] Título:Association of alkali metal cations with phosphatidylcholine liposomal membrane surface.
[So] Source:Eur Biophys J;46(2):149-155, 2017 Mar.
[Is] ISSN:1432-1017
[Cp] País de publicação:Germany
[La] Idioma:eng
[Ab] Resumo:Interactions of alkali metal cations (Li , Na , K , Cs ) with phosphatidylcholine (PC) liposomal membranes were investigated through experimental studies and theoretical considerations. Using a microelectrophoresis technique, charge densities of experimental membrane surfaces were measured as a function of the pH of electrolyte solutions. Equilibria between the PC liposomal membranes and monovalent ions were mathematically analyzed and described quantitatively through a previously proposed theoretical model. Association constants between functional groups of PC and the studied ions were determined and used to define theoretical curves of membrane surface charge density versus pH. Theoretical and experimental data were compared to verify the model. The PC membrane was found to have the highest affinity for lithium ions, among the ions tested.
[Mh] Termos MeSH primário: Lipossomos/química
Metais Alcalinos/química
Fosfatidilcolinas/química
[Mh] Termos MeSH secundário: Cátions/química
Concentração de Íons de Hidrogênio
Modelos Teóricos
Eletricidade Estática
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Cations); 0 (Liposomes); 0 (Metals, Alkali); 0 (Phosphatidylcholines)
[Em] Mês de entrada:1702
[Cu] Atualização por classe:170719
[Lr] Data última revisão:
170719
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:160703
[St] Status:MEDLINE
[do] DOI:10.1007/s00249-016-1150-1


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[PMID]:27126084
[Au] Autor:Nair GB; Bhoyar PD; Dhoble SJ
[Ad] Endereço:Department of Physics, R.T.M. Nagpur University, Nagpur 440033, India.
[Ti] Título:Exploration of electron-vibrational interaction in the 5d states of Eu ions in ABaPO (A = Li, Na, K and Rb) phosphors.
[So] Source:Luminescence;32(1):22-29, 2017 Feb.
[Is] ISSN:1522-7243
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:This work reports the theoretical analysis of the electron-vibrational interaction (EVI) in 4f-5d optical transitions of Eu ions in ABaPO (A = Li, Na, K and Rb) systems. The EVI parameters were estimated from the recently reported room temperature photoluminescence results, by employing the spectrum-fitting method. Parameters such as the Huang-Rhys factor, effective phonon energy, Stokes shift and zero-phonon line position were estimated and are reported here. The estimated EVI parameters were validated by modeling the emission band and establishing the agreement between the experimental and modeled emission bands. Copyright © 2016 John Wiley & Sons, Ltd.
[Mh] Termos MeSH primário: Bário/química
Elétrons
Európio/química
Metais Alcalinos/química
Fosfatos/química
[Mh] Termos MeSH secundário: Íons/química
Luminescência
Processos Fotoquímicos
Vibração
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Ions); 0 (Metals, Alkali); 0 (Phosphates); 24GP945V5T (Barium); 444W947O8O (Europium)
[Em] Mês de entrada:1704
[Cu] Atualização por classe:170421
[Lr] Data última revisão:
170421
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:160430
[St] Status:MEDLINE
[do] DOI:10.1002/bio.3143


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[PMID]:27169145
[Au] Autor:Sigel A; Sigel H; Sigel RK
[Ti] Título:The Alkali Metal Ions: their Role for Life. Preface to Volume 16.
[So] Source:Met Ions Life Sci;16:vii-xi, 2016.
[Is] ISSN:1559-0836
[Cp] País de publicação:Netherlands
[La] Idioma:eng
[Mh] Termos MeSH primário: Metais Alcalinos/química
Metais Alcalinos/metabolismo
[Mh] Termos MeSH secundário: Animais
Coenzimas/química
Coenzimas/metabolismo
Canais Iônicos/metabolismo
ATPase Trocadora de Sódio-Potássio/metabolismo
[Pt] Tipo de publicação:INTRODUCTORY JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Coenzymes); 0 (Ion Channels); 0 (Metals, Alkali); EC 3.6.3.9 (Sodium-Potassium-Exchanging ATPase)
[Em] Mês de entrada:1606
[Cu] Atualização por classe:160511
[Lr] Data última revisão:
160511
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:160513
[St] Status:MEDLINE


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[PMID]:27150910
[Au] Autor:Ramos P; Santos A; Pinto E; Pinto NR; Mendes R; Magalhães T; Almeida A
[Ad] Endereço:LAQV/REQUIMTE, Department of Chemical Sciences, Laboratory of Applied Chemistry, Faculty of Pharmacy, Porto University, Rua de Jorge Viterbo Ferreira 228, 4050-313 Porto, Portugal.
[Ti] Título:Alkali metals levels in the human brain tissue: Anatomical region differences and age-related changes.
[So] Source:J Trace Elem Med Biol;38:174-182, 2016 Dec.
[Is] ISSN:1878-3252
[Cp] País de publicação:Germany
[La] Idioma:eng
[Ab] Resumo:The link between trace elements imbalances (both "toxic" and "essential") in the human brain and neurodegenerative disease has been subject of extensive research. More recently, some studies have highlighted the potential role of the homeostasis deregulation of alkali metals in specific brain regions as key factor in the pathogenesis of neurodegenerative diseases such as multiple sclerosis and Alzheimer's disease. Using flame atomic emission spectrometry and inductively coupled plasma-mass spectrometry after microwave-assisted acid digestion of the samples, alkali metals (Na, K, Li, Rb and Cs) were determined in 14 different areas of the human brain (frontal cortex, superior and middle temporal gyri, caudate nucleus, putamen, globus pallidus, cingulated gyrus, hippocampus, inferior parietal lobule, visual cortex of the occipital lobe, midbrain, pons, medulla and cerebellum) of adult individuals (n=42; 71±12, range: 50-101 years old) with no known history and evidence of neurodegenerative, neurological or psychiatric disorder. Potassium was found as the most abundant alkali metal, followed by Na, Rb, Cs and Li. Lithium, K and Cs distribution showed to be quite heterogeneous. On the contrary, Rb and Na appeared quite homogeneously distributed within the human brain tissue. The lowest levels of Na, K, Rb and Li were found in the brainstem (midbrain, medulla and pons) and cerebellum, while the lowest levels of Cs were found in the frontal cortex. The highest levels of K (mean±sd; range 15.5±2.5; 8.9-21.8mg/g) Rb (17.2±6.1; 3.9-32.4µg/g and Cs (83.4±48.6; 17.3-220.5ng/g) were found in putamen. The highest levels of Na and Li were found in the frontal cortex (11.6±2.4; 6.6-17.1mg/g) and caudate nucleus (7.6±4.6 2.2-21.3ng/g), respectively. Although K, Cs and Li levels appear to remain largely unchanged with age, some age-related changes were observed for Na and Rb levels in particular brain regions (namely in the hippocampus).
[Mh] Termos MeSH primário: Envelhecimento/metabolismo
Encéfalo/anatomia & histologia
Encéfalo/metabolismo
Metais Alcalinos/análise
Metais Alcalinos/metabolismo
[Mh] Termos MeSH secundário: Idoso
Idoso de 80 Anos ou mais
Feminino
Seres Humanos
Masculino
Meia-Idade
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Metals, Alkali)
[Em] Mês de entrada:1706
[Cu] Atualização por classe:170601
[Lr] Data última revisão:
170601
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:160507
[St] Status:MEDLINE


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[PMID]:27082743
[Au] Autor:Reuter K; Buchner MR; Thiele G; von Hänisch C
[Ad] Endereço:Fachbereich Chemie and Wissenschaftliches Zentrum für Materialwissenschaften (WZMW), Philipps-Universität Marburg , Hans-Meerwein-Straße 4, 35032 Marburg, Germany.
[Ti] Título:Stable Alkali-Metal Complexes of Hybrid Disila-Crown Ethers.
[So] Source:Inorg Chem;55(9):4441-7, 2016 05 02.
[Is] ISSN:1520-510X
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:The complexation ability of hybrid disilane and ethylene containing crown ether ring systems was analyzed using 1,2-disila[12]crown-4 (1), 1,2-disila[15]crown-5 (2), 1,2-disila[18]crown-6 (3), and 1,2,7,8-tetrasila[12]crown-4 (7). Alkali-metal complexes (Li(+), Na(+), K(+)) were obtained and analyzed via X-ray diffraction. The complex stability of [Li(1,2-disila[12]crown-4)](+) and [Li(1,2,7,8-tetrasila[12]crown-4)](+) was determined, in relation to the lithium complex of [12]crown-4, by density functional theory (DFT) calculations employing the BP86/def2-TZVP level of theory. In solution, the exchange of lithium cations between pure [12]crown-4 and hybrid [12]crown-4 is on even terms, as has been shown from the relative binding affinity of compounds 1 and 7 by means of dynamic proton nuclear magnetic resonance (NMR) spectroscopy.
[Mh] Termos MeSH primário: Complexos de Coordenação/química
Éteres de Coroa/química
Metais Alcalinos/química
Compostos de Organossilício/química
[Mh] Termos MeSH secundário: Complexos de Coordenação/síntese química
Éteres de Coroa/síntese química
Isótopos
Lítio/química
Estrutura Molecular
Compostos de Organossilício/síntese química
Potássio/química
Espectroscopia de Prótons por Ressonância Magnética
Teoria Quântica
Sódio/química
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Coordination Complexes); 0 (Crown Ethers); 0 (Isotopes); 0 (Metals, Alkali); 0 (Organosilicon Compounds); 9FN79X2M3F (Lithium); 9NEZ333N27 (Sodium); RWP5GA015D (Potassium)
[Em] Mês de entrada:1710
[Cu] Atualização por classe:171003
[Lr] Data última revisão:
171003
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:160416
[St] Status:MEDLINE
[do] DOI:10.1021/acs.inorgchem.6b00267


  10 / 618 MEDLINE  
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[PMID]:27041658
[Au] Autor:Troc A; Zimnicka M; Kolinski M; Danikiewicz W
[Ad] Endereço:Institute of Organic Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, 01-224, Warsaw, Poland.
[Ti] Título:Structural Elucidation of ß-Lactam Diastereoisomers through Ion Mobility Mass Spectrometry Studies and Theoretical Calculations.
[So] Source:J Mass Spectrom;51(4):282-90, 2016 Apr.
[Is] ISSN:1096-9888
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:The ion mobility combined with mass spectrometry and theoretical calculations were used to characterize and separate six diastereoisomeric ß-lactams. The influence of traveling wave height and wave velocity, size of the alkali metal ion (Li(+), Na(+) and K(+)) and drift gases with varying masses and polarizabilities (N2 and CO2) on separation efficacy was additionally examined. The best separation of diastereoisomers of ß-lactams was observed for adducts with Na(+) and Li(+) ions, whereas other parameters had little impact on separation process. The isomeric ß-lactams were characterized by both experimental and theoretical collision cross sections. The theoretically calculated values of collision cross sections obtained from extensive molecular dynamics and density functional theory calculations for model structures agreed well with those established experimentally. The relationship between separation efficacy and the configuration at the carbon atoms C5 and C6 of ß-lactam ring was defined.
[Mh] Termos MeSH primário: Espectrometria de Massas/métodos
beta-Lactamas/química
[Mh] Termos MeSH secundário: Algoritmos
Dióxido de Carbono/química
Íons/química
Metais Alcalinos/química
Modelos Moleculares
Nitrogênio/química
Estereoisomerismo
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T
[Nm] Nome de substância:
0 (Ions); 0 (Metals, Alkali); 0 (beta-Lactams); 142M471B3J (Carbon Dioxide); N762921K75 (Nitrogen)
[Em] Mês de entrada:1612
[Cu] Atualização por classe:161230
[Lr] Data última revisão:
161230
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:160405
[St] Status:MEDLINE
[do] DOI:10.1002/jms.3749



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