Janusz Kowalik - Academia.edu (original) (raw)

Papers by Janusz Kowalik

An entry from the Cambridge Structural Database, the world's repository for small molecule cr... more An entry from the Cambridge Structural Database, the world's repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.

ChemInform, 1988

The stoichiometries and stability constants of the proton, Co(II), Ni(II), Cu(II), and Zn(II) com... more The stoichiometries and stability constants of the proton, Co(II), Ni(II), Cu(II), and Zn(II) complexes of the title phosphonic acids (I) and (II) are determined pH-metrically. From these data and the spectral parameters of the complexes it is established that these simple acids coordinate similarly to aminocarboxylic acids forming 1:1 and 1:2 chelate complexes. However, a species with only phosphonate group coordination also exist at low pH. The differences between the complex-forming properties of aminophosphonates and aminocarboxylates are explained by the difference in basicity, charge and size of the-PO32-and-COO-groups.

ECS Meeting Abstracts, 2006

As Condições Sensíveis à Atenção Primária (CSAP) são um excelente indicador da efetividade dessa ... more As Condições Sensíveis à Atenção Primária (CSAP) são um excelente indicador da efetividade dessa atenção. Objetivo: Analisar as internações no setor de pediatria de um Hospital Universitário no Maranhão, em 2012, em estudo descritivo e retrospectivo. Métodos: Dados de prontuários de pacientes até 16 anos e 11 meses de idade foram avaliados pelo software IBM SPSS Statistics 20, tendo como parâmetro a Lista Brasileira de CSAP. Para frequências de CSAP por faixa etária aplicou-se teste de 2 x de aderência, com 5% de significância. Resultados: Das 506 internações, 17% foram por CSAP, 51% do sexo masculino e 36% da faixa etária de 1 a 4 anos; 50% eram residentes na capital do estado e 65,1% em zona urbana; em 57% dos municípios de residência não havia Unidade Básica de Saúde da Família. A média do tempo de internação foi 23,2 dias. O grupo CSAP mais frequente foi o das pneumonias (25,5%). Conclusão: As internações por CSAP mais frequentes foram Pneumonias e Infecções nos rins e trato urinário e a faixa etária com mais internações foi a de 1 a 4 anos, sendo semelhantes a outros estudos e são um alerta para a investigação dos determinantes da população e para melhorias na Atenção Primária.

Nature, 1951

Determination of the Absolute Configuration of Optically Active Compounds by Means of X-Rays

Journal of Materials Science, 2008

We report continuous carbon nanotube (CNT) fibers and yarns dry-drawn directly from water-assiste... more We report continuous carbon nanotube (CNT) fibers and yarns dry-drawn directly from water-assisted chemical vapor deposition (CVD) grown forests with about 1-mm height. As-drawn CNT fibers exist as aerogel and can be transformed into more compact fibers through twisting or densification with a volatile organic liquid. CNT fibers are characterized by scanning electron microscopy, X-ray photoelectron spectroscopy, Raman microscopy, and wideangle X-ray diffraction. Mechanical properties and electrical conductivity of the post-treated CNT fibers are investigated. The resulting fibers show the work of rupture of 30 J/g and DC electrical conductivity of 5.0 9 10 4 S/m.

Inorganica Chimica Acta, 1987

The stoichiometries and stability constants of the proton, cobalt(U), nickel(II), copper(I1) and ... more The stoichiometries and stability constants of the proton, cobalt(U), nickel(II), copper(I1) and zinc(I1) complexes of 1-aminoethanephosphonic acid ((u-Ala-P), 2-aminoethanephosphonic acid @-Ala-P), 1-amino-2-phenylethanephosphonic acid (Phe-P) and 1-amino-2{4-hydroxyphenyl)ethanephosphonic acid (Tyr-P) have been determined pH-metrically at 25 "C and at an ionic strength of 0.2 mol dmm3 (KCl). From these data and the spectral parameters of the complexes it has been established that these simple aminophosphonic acids coordinate similarly to aminocarboxylic acids, forming chelate complexes MA and MA*. However an MAH species with only phosphonate group coordination also exist at low pH. The differences between the complex-forming properties of aminophosphonates and aminocarboxylates have been explained by the differences in basicity, charge and size of the-P03*-and-COOgroups.

Analytical Chemistry, 2010

The combination of scanning electrochemical microscopy (SECM) with single-bounce attenuated total... more The combination of scanning electrochemical microscopy (SECM) with single-bounce attenuated total reflection Fourier-transformed infrared spectroscopy (IR-ATR) has been developed for in-situ studies on electrochemically induced processes at IR waveguide surfaces via evanescent field absorption spectroscopy. The feasibility of the combined microelectrochemical FT-IR setup was demonstrated by spectroscopically monitoring microstructured polymer depositions induced via feedback mode SECM using a 25 μm Pt disk ultramicroelectrode (UME). The surface of a ZnSe ATR crystal was initially coated with 2,5di-(2-thienyl)-pyrrole (SNS) layer, which was then locally polymerized during Ru(bpy) 3 2+ mediated feedback mode SECM experiments. The polymerization reaction was simultaneously monitored by recording absorption intensity changes of SNS specific IR bands, thereby providing information on the polymerization mechanism, and on the percentage of surface modification.

Journal of the American Chemical Society, 2003

Perspectives in Bioanalysis, 2005

... Temitope Aiyejorun a , Liz Thompson a , Janusz Kowalik a , Mira Josowicz a and Jiří Janata a.... more ... Temitope Aiyejorun a , Liz Thompson a , Janusz Kowalik a , Mira Josowicz a and Jiří Janata a. ... probe) and its distribution, packing density and orientation affect not only the recognition of the target but also influence the sensing performance of the probe (Ye and Ju, 2003). ...