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Biomedical subjects

I P Pavlova

Publications and source records attributed to I P Pavlova.

At least 19 recordsLinked to original sources
PubMed1993

Serum corticosteroid-binding globulin levels in children undergoing heart surgery.

Serum corticosteroid-binding globulin (CBG) levels were measured in children (mean age 4 years) during heart surgery. Considerable decrease in CBG level occurred between baseline examination (416 +/- 39 nM) and the day of surgery (314 +/- 30 nM). Relatively simple closed heart surgery did not influence CBG level with maximal cortisol level being 20 +/- 4 micrograms/dl. Open heart surgery under conditions of profound hypothermia (26 C, without extracorporeal circulation) caused dramatic lowering of CBG level, particularly striking after resuscitation (180 +/- 20 nM). At the same time cortisol level reached extremely high values (78 +/- 8 micrograms/dl). These data suggest that CBG is likely to play an important role in pituitary-adrenal response to surgery under severe conditions of hypothermia and cardiac arrest.

Cardiac Surgical Procedures↗
PubMed1992

[Specific IgE antibodies in brucellosis].

Specific IgE antibodies and sensitization were assessed in patients with brucellosis in various forms. IgE antibodies were determined with enzyme immunoassay which demonstrated high specificity and sensitivity with conjugate against IgE antibodies in 509 serum samples. Specific IgE antibodies were present in most patients with acute, subacute or chronic brucellosis. Their synthesis seems to be a normal component of humoral immunity in response to brucellosis agent invasion. Allergy in brucellosis seems to arise without participation of the IgE antibodies as there is no correlation between the antibodies levels, the response to Burnet's allergic test and specific leukocytolysis activity.

Acute Disease↗
PubMed1991

[The use of the latex agglutination reaction for the diagnosis of a Brucella infection].

The authors have developed the optimum conditions for the preparation of antigenic diagnosticum based on latex manufactured in the USSR. To sensitize latex with the diameter of microspheres equal to 0.83 microns, Brucella polysaccharide was used in a dose of 100 micrograms/ml. As stabilizer, polyvinylpyrrolidone at a concentration of 0.1% was used. The specificity and sensitivity of the diagnosticum were studied in analysis of serum samples taken from 102 healthy donors and patients with infectious diseases of nonbrucellar etiology and from 120 patients with different forms of brucellosis. The specificity of the diagnosticum was found to be 94.1% and its sensitivity, 77.5%. Comparative study of the latex agglutination test with other serological tests showed that the former test is highly effective both in acute and chronic forms of the disease. A high degree of correlation between the agglutination test, Coombs' test, the passive hemagglutination test and the latex agglutination test was established (r = 0.83, 0.72 and 0.62, respectively).

Antibodies, Bacterial↗
PubMed1990

[Specific immunoglobulins of different classes in brucellosis in human beings].

The paper is concerned with the results of studying the level of specific IgG, IgA and IgM in people with different forms of brucellosis. Immunoglobulins belonging to different classes were identified by means of IEA. Examination of 514 patients with different forms of brucellosis and 122 controls demonstrated the high specificity and sensitivity of IEA for detecting antibodies of different physiochemical nature. The use of IEA made it possible to establish definite regularities of the synthesis of specific IgG, IgA, IgM in people with brucellosis, which can be used for assessing the activity of the infectious process.

Acute Disease↗
PubMed1989

[Use of an affinity chromatography method for isolating monospecific Salmonella antibodies].

Obtaining antibodies to individual components of Salmonella antigenic complex is highly important for investigations aimed at the study of the antigenic structure of bacteria, their serological identification and the development of diagnostic preparations. The method of obtaining antibodies by the oxidation of Salmonella antigens with sodium periodate and creating immunosorbents based on these antibodies with subsequent affinity chromatography has been developed. Monospecific antibodies thus obtained (O2, O4, O9) have been studied and used as monospecific preparations in the agglutination test, the immunofluorescence test and the immunosorbent assay. The development of methods for stabilizing these preparations, thus ensuring their wide practical use, may be of interest.

Agglutination Tests↗
PubMed1989

[The use of an immunoenzyme method for the rapid diagnosis of legionellosis].

An enzyme immunoassay (EIA) system for the detection of L. pneumophila antigen in clinical material (sputum, urine, bronchial washings) has been developed. The use of EIA permits the detection of L. pneumophila antigen in the urine of 75-80% of patients during the first week of the disease. The specificity and sensitivity of EIA makes it possible to recommend this method for the rapid diagnosis of L. pneumophila infection.

Antibodies, Bacterial↗
PubMed1988

[Use of the ELISA immunoenzyme method for the detection of the causative agent of tularemia].

The conditions of the enzyme-linked immunosorbent assay (ELISA) for the detection of Francisella tularensis were worked out. In the study of 27 strains differing in their biological characteristics, the sensitivity of the assay was determined, varying within the range of 1 X 10(4)--5 X 10(4) million cells/ml and exceeding the sensitivity of the currently used methods for the immunodiagnosis of tularemia by 1-2 orders. ELISA also proved to be a highly effective technique for the detection of the specific antigen in the organs of infected animals. The antigen was regularly detected in the organs of white mice, beginning from day 3 after their infection with the minimal doses of F. tularensis. The method may be recommended both for the identification of isolated cultures and for the early diagnosis of tularemia infection.

Animals↗
PubMed1987

[Detection of the antigens of the causative agent of brucellosis by an immunoenzyme method].

The conditions of the enzyme immunoassay for the detection of Brucella antigens have been selected, making it possible to detect these antigens both in solutions and in biological material within 3-4 hours. In guinea pigs infected with B. abortus 99 in a dose of 1,000 microbial cells, brucellar antigen has been detectable in the organs and blood serum of the animals as early as 24 hours after infection. This assay, if carried out under the optimal conditions, detects soluble brucellar polysaccharide antigen at a concentration of 1 ng/ml and Brucellae at a concentration of 5 X 10(4) microbial cells/ml in the presence of 200-fold surplus of other bacterial cells.

Animals↗
PubMed1987

[Development of an immunoenzyme test system for determining the antigens of feed yeasts].

An enzyme immunoassay (EIA) system for the detection of fodder yeast antigens in the air of production areas at fodder protein producing plants has been developed. The method has proved to be highly sensitive and specific and shows advantages in comparison with the nonspecific method of low sensitivity, currently used at such plants. The sensitivity of solid-phase EIA techniques is 0.001 micrograms/ml (for protein) or 10(2)-10(3) cells/ml, and 10 ng/ml for soluble antigen. No cross reactions with bakers' yeast antigen have been observed.

Air Pollutants, Occupational↗
PubMed1987

[Choice of the suitability criteria of polystyrene-based solid-phase carriers for performing immunoenzyme analyses].

The authors discuss a tentative approach to the choice of criteria indicating the optimal suitability of different solid-phase carriers made of polystyrene for use in the enzyme immunoassay (EIA), viz. the dependence of specificity, sensitivity, reproducibility and reliability of EIA results on the adsorption properties, transparency expressed in percent and transparency variations of the plates under test. The evaluation of the carriers by four parameters is proposed with the use of assay plates manufactured by Nunc A/S (Denmark) for control. To ensure the objective evaluation of the suitability of polystyrene plates for use in EIA, the choice of uniform criteria is necessary.

Adsorption↗
PubMed1986

[Immunoenzyme method in the diagnosis of human brucellosis].

The optimum conditions for the determination of specific antibodies in the sera of brucellosis patients by means of enzyme immunoassay (EIA) have been selected. The comparative study of the specificity and sensitivity of EIA and other serological tests has demonstrated that EIA has high diagnostic effectiveness in the diagnosis of acute and chronic brucellosis. The presence of direct correlation between the results of EIA and Coombs' test is observed, which is indicative of the capacity of EIA for detecting both complete and incomplete specific antibodies. It should be pointed out that in all cases the titer of specific antibodies in EIA has been found to be 5-16 times higher than in Coombs' test, the passive hemagglutination test, and agglutination test.

Antibodies, Bacterial↗
PubMed1986

[Development of an immunoenzyme method for detecting Francisella tularensis].

The conditions permitting the determination of F. tularesis cells by means of the enzyme immunoassay (EIA) in 3-5 hours have been established. Ways for enhancing the reliability of results obtained in the assay of the least possible amount of the test material have been proposed. The sensitivity and specificity of the rapid EIA technique permitting the determination of F. tularensis cells at a concentration of 20 000 cells/ml in the presence of other bacterial cells in 100-fold excess have been shown.

Antibodies, Bacterial↗
PubMed1985

[Development of an immunoenzyme test system for detecting antibodies to commercial strains of feed yeasts].

ELISA as a specific and highly sensitive test system was used for the examination of large groups of workers employed in the production of fodder protein to detect antibodies to the production strains of fodder yeast. The results yielded by ELISA correlated well with those obtained by the serological luminescent techniques, but antibody titers determined by means of ELISA are 10-20 times higher.

Animal Feed↗
PubMed1984

[Determination of tularemia antibodies by an immunoenzyme method on a solid-phase carrier (ELISA)].

ELISA "sandwich" techniques have been developed and the optimum assay conditions for detecting specific antibodies in human serum samples have been determined. The possibility of using these techniques for the determination of the level of antibodies to tularemia antigens in the sera of persons immunized with live tularemia vaccine has been shown. Statistically significant differences in the level of antibodies to tularemia antigen in the sera of immunized and nonimmunized persons have been established. The comparative study of five serological methods - ELISA, the agglutination test, the passive hemagglutination test, the immunofluorescence test and the defined antigen substrate sera ( DASS ) techniques - has revealed the advantage of ELISA, whose sensitivity has proved to be considerably higher than that of all other methods used in our work.

Agglutination Tests↗