Polymorph
Mostrando 13-24 de 59 artigos, teses e dissertações.
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13. Preparation and characterization of polymorphic structures of the tolbutamide and nifedipine / Preparação e caracterização de estruturas polimórficas da tolbutamida e nifedipina
In this study the polymorphs of tolbutamide, an oral hypoglicemiant used on Diabetes Mellitus type II treatment, and of nifedipine, a drug used in the cardiovascular disorders treatment, were prepared. All crystalline forms were obtained by crystallization from different solvents. Tolbutamide was isolated only in crystalline forms and nifedipine in two cryst
Publicado em: 2005
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14. Preparação e caracterização do Sistema polifosfato misto contendo o ion Erbio
According to available published data, antimony polyphosphates have not attracted much attention from researchers. Currently polyphosphates of trivalent elements, including those of lanthanides, are widely employed in glasses suitable for light transmission within the region of telecommunication windows. In this case, the combination of antimony and rare ear
Publicado em: 2004
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15. The role of defect microstructure in the crystallization behavior of metallocene and MgCl2-supported Ziegler-Natta isotactic poly(propylenes)
The intermolecular defect distribution of poly(propylenes) of the Ziegler-Natta (ZN) and metallocene (M) types is assessed by classical fractionation and analysis of the fractions by GPC and 13C NMR. In addition, the linear growth rates, a property sensitive to differences in defects distribution in the poly(propylene) chain, are used to infer the stereobloc
Polímeros. Publicado em: 2003-12
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16. Dissulfeto de molibdênio, um material multifuncional e surpreendente
The aim of this work is to review the chemical and physical properties of layered molybdenum disulfide. The three polymorphic/polytypic modifications of the compound were found, the polytypes 2H (molybdenite) and 3R are semiconductors while the polymorph 1T is an electronic conductor. 2H-MoS2 has several important industrial applications as hydrotreatment ca
Química Nova. Publicado em: 2002-02
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17. Malabsorção de lactose do adulto. Prevalencia na população sulina. Aspectos geneticos e evolutivos do polimorfismo da atividade da lactose
A lactose loading test was applied to seventy healthy adults, well nourished, from Southern Brazil (48 caucasoids and 22 negroids) with no secondary lactase deficiency. The distribution of the examined individuals according to race and to maximum blood glucose rise after the lactose loading test showed an antimode at the interval bet ween 14 and 17 mg% and a
Publicado em: 1990
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18. Refinamento da estrutura cristalina de um polimorfo do ácido 5-etil-5-sec-butil barbiturico (butabarbital) / Refinement of the crystalline structure of a polymorph of the acid 5-ethyl-5-sec-butyl barbiturates (butabarbital)
Resultados de medidas de ponto de fusão, análise por raios-x e de espectroscopia infravermelho são apresentados para a identificação de dois polimorfos do ácido 5-etil-5-sec-butil barbitúrico (butabarbital).A estrutura do polimorfo II foi refinada simultaneamente com dois conjuntos de dados de origens diversas. Os dados cristalográficos são: a= 10,2
Publicado em: 1973
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19. In-plane phase transition of an integral membrane protein: nucleation of the OmpF matrix porin rectangular polymorph.
A hexagonal polymorph (a = 79 A) of OmpF matrix porin from Escherichia coli spontaneously transforms to a rectangular form (a = 79 A, b = 137 A) after several months' storage in the refrigerator. Nucleation of this second polymorph is first disclosed by diffuse streaks in electron diffraction patterns or in computer-generated Fourier transforms of electron m
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20. An assessment of the histological criteria used to diagnose infection in hip revision arthroplasty tissues.
AIM: To characterise the number and nature of the inflammatory cells seen in cases of septic or aseptic loosening of hip arthroplasty, and to establish reliable histological criteria to distinguish between these two conditions. METHODS: Histological examination of paraffin sections of periprosthetic tissues (pseudocapsule, femoral and acetabular pseudomembra
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21. A sex difference in the leucocyte count
In a study of a group of 325 blood donors between the ages of 18 and 65 years, the total leucocyte and polymorph counts of the females aged 50 to 65 years were found to be significantly lower than those of the corresponding group of male donors. In the whole series of female donors, there were significantly lower total leucocyte and lymphocyte counts with in
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22. Elucidation of crystal form diversity of the HIV protease inhibitor ritonavir by high-throughput crystallization
Pharmaceutical compounds are molecular solids that frequently exhibit polymorphism of crystal form. One high profile case of polymorphism was ritonavir, a peptidomimetic drug used to treat HIV-1 infection and introduced in 1996. In 1998, a lower energy, more stable polymorph (form II) appeared, causing slowed dissolution of the marketed dosage form and compr
The National Academy of Sciences.
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23. Polymorphonuclear leucocyte motility in men with ankylosing spondylitis.
The polymorphonuclear leucocyte (PMN) response to a chemotactic or chemokinetic stimulus is enhanced in men with ankylosing spondylitis (AS). This effect does not parallel the severity of disease activity or the size of the acute phase response, and it is independent of non-steroidal anti-inflammatory drug treatment. Polymorph function is normal in HLA-B27 p
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24. Proceedings: Stimulation of polymorph migration by a factor produced by steroid-treated monocytes.