RESUMO
UNLABELLED: The aim of this work was to assess the potential of some physical and chemical methods for studying erythrocytes and blood serum in gastroenterological practice by the example of colorectal cancer (CC). MATERIALS AND METHODS: A total of 26 persons with various stages of colorectal cancer and 16 healthy (control group) were examined. Parameters of erythrocytes and blood serum were investigated by light microscopy, dielectrophoresis in a non-uniform alternating electric field (DEF in NUAEF), terahertz spectroscopy, ellipsometry, Raman-spectroscopy. RESULTS: Polymorphism of erythrocytes, rigidity, viscosity, indexes of aggregation and destruction were significantly higher in patients with CC and polarizability, amplitude of erythrocyte deformation in NUAEF being lower than those in the controls. The study of erythrocytes by terahertz spectroscopy revealed the low levels of amplitude transmittance over the whole frequency range in CC patients compared to the controls. The increasing of refractive index, degree of heterogeneity of thin films obtained from the serum in CC patients were observed in considering the ellipsometric parameters. We found a significant increasing of the concentration of antigens to CD24 at the early stage of the disease. The areas of some peaks in Raman spectra were significantly lower in patients with CC compared to the healthy ones, it is possible due to a carotin deficiency. Most of the studied parameters were correlated with the stage of the disease. A set of optical methods for studying blood serum compared with those of histology and radiological methods of diagnosis showed their high sensitivity and specificity, positive and negative predictive value (80 % and above). CONCLUSION: The obtained results of the pilot study demonstrate the prospects of using physical and chemical methods of research of erythrocytes and blood serum for early diagnosis, stage of disease and monitoring the effectiveness of treatment of CC.
Assuntos
Análise Química do Sangue/métodos , Neoplasias Colorretais/sangue , Neoplasias Colorretais/diagnóstico , Eritrócitos/metabolismo , Adulto , Idoso , Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Projetos Piloto , Valor Preditivo dos TestesRESUMO
Under supervision there were 38 men (age from 36 till 57 years) with diffuse hepatic diseases (DHD) in stadia of hepatitis, 27--in dynamics of treatment of essential phospholipids. Is experimentally established: structure-functional erythrocyte characteristics by methods of dielectrophoresis, thin-layer chromatography correlate with lipid and phospholipid composition of red cell membranes. The low level of phospholipids in erythrocyte membranes and direction of changes in their fractional composition in the DHD is the basis for the use of essential phospholipids. Against the background of therapy noted a significant increase in amplitude of deformation, polarizability, capacity, speed of movement of red blood cells to the electrodes and lower levels of generalized indicators of viscosity, rigidity, electrical conductivity, index of aggregation and destruction.
Assuntos
Adjuvantes Imunológicos/administração & dosagem , Deformação Eritrocítica/efeitos dos fármacos , Membrana Eritrocítica/metabolismo , Hepatite Crônica/tratamento farmacológico , Hepatite Crônica/metabolismo , Fosfatidilcolinas/administração & dosagem , Fosfatidilcolinas/metabolismo , Adjuvantes Imunológicos/metabolismo , Adulto , Impedância Elétrica , Feminino , Humanos , Masculino , Pessoa de Meia-Idade , ViscosidadeRESUMO
Spectra of amplitudes of polarization of erythrocytes, yeast cells, and latex particles in the range of 1-10 Hz were investigated by the method of dielectrophoresis. Positive dielectrophoresis of erythrocytes and yeast cells the frequency range of 60 - 100 Hz was revealed. The theoretically positive dielectrophoresis was evidenced by the occurrence of channels across the cell membrane and bacterial cell wall.
Assuntos
Bactérias/química , Membrana Celular/química , Polaridade Celular , Parede Celular/química , Eritrócitos/química , Leveduras/química , Animais , Humanos , MicroesferasRESUMO
The review presents modern data on outbreaks of avian influenza subtype H5N1 and the incidence of the infection in animals, birds, and humans. The authors adduce data on the resistance of influenza A virus to physical and chemical factors. Factors making avian influenza A virus potentially capable of causing human pandemia are considered. The review also deals with public health possibilities in the event of influenza pandemia, and measures directed towards lowering its negative social and economic consequences.