Results 261 to 270 of about 537,139 (296)
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Journal of Allergy and Clinical Immunology, 1988
The reliability of a qualitative test for sulfites in foods (Sulfitest sulfite test strips) was evaluated by comparison of the results obtained from the analysis of 90 food and beverage samples to results obtained by the quantitative, modified Monier-Williams method (the preferred procedure for sulfite analysis in foods of the Food and Drug ...
J A, Nordlee, S G, Naidu, S L, Taylor
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The reliability of a qualitative test for sulfites in foods (Sulfitest sulfite test strips) was evaluated by comparison of the results obtained from the analysis of 90 food and beverage samples to results obtained by the quantitative, modified Monier-Williams method (the preferred procedure for sulfite analysis in foods of the Food and Drug ...
J A, Nordlee, S G, Naidu, S L, Taylor
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[False negative reactions in the serodiagnosis of cystic echinococcosis in humans].
Immunitat und Infektion, 1985Clinically supposed cases of echinococcosis can be strongly confirmed by application of serodiagnostic techniques. In certain cases false-negative reactions have to be taken into account. This has been observed in 4 out of 51 parasitologically confirmed cases.
K, Janitschke, H, Werner, L, Thomas
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Neuromuscular Disorders, 2007
We report a false negative histochemical reaction for myophosphorylase in the case of an 11 year old with fulminant Staphylococcus aureus. Due to increased creatine kinase levels and marked myoglobinuria a muscle biopsy was performed prior to death.
M, Cristina Pacheco +2 more
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We report a false negative histochemical reaction for myophosphorylase in the case of an 11 year old with fulminant Staphylococcus aureus. Due to increased creatine kinase levels and marked myoglobinuria a muscle biopsy was performed prior to death.
M, Cristina Pacheco +2 more
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International Journal of Cancer, 1974
AbstractTitration of anti‐complementary human sera may yield false negative or prozone reactions in anti‐complement immunofluorescence (ACIF) tests for antibodies to Epstein‐Barr virus‐associated nuclear antigen (EBNA) when the human complement (C') is added to the serum dilutions prior to charging of the target cell smears (two‐stage ACIF test).
W, Henle, A, Guerra, G, Henle
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AbstractTitration of anti‐complementary human sera may yield false negative or prozone reactions in anti‐complement immunofluorescence (ACIF) tests for antibodies to Epstein‐Barr virus‐associated nuclear antigen (EBNA) when the human complement (C') is added to the serum dilutions prior to charging of the target cell smears (two‐stage ACIF test).
W, Henle, A, Guerra, G, Henle
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Annales de dermatologie et de venereologie, 2009
This chapter reviews pitfalls and mistakes in patch testing. Most sources of false-positive and false-negative reactions are indicated and analysed. Cross-sensitivity among allergens is discussed and compound allergy is debated. Keys for establishing relevance are indicated, for a better reading and interpretation of patch testing by practitioners ...
C J, Le Coz, D, Sasseville
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This chapter reviews pitfalls and mistakes in patch testing. Most sources of false-positive and false-negative reactions are indicated and analysed. Cross-sensitivity among allergens is discussed and compound allergy is debated. Keys for establishing relevance are indicated, for a better reading and interpretation of patch testing by practitioners ...
C J, Le Coz, D, Sasseville
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The Pediatric Infectious Disease Journal, 2002
Diagnosis of HIV infection in early infancy generally relies on detection of HIV proviral DNA by PCR. However, many of the HIV DNA PCR assays currently in use are either not optimized or have not been validated for diagnosis of infection with non-subtype B HIV.
Nancy E, Kline +2 more
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Diagnosis of HIV infection in early infancy generally relies on detection of HIV proviral DNA by PCR. However, many of the HIV DNA PCR assays currently in use are either not optimized or have not been validated for diagnosis of infection with non-subtype B HIV.
Nancy E, Kline +2 more
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European Journal of Clinical Microbiology & Infectious Diseases, 1997
The aim of this study was to assess the presence of inhibitors in urine specimens causing false-negative results in a commercial Chlamydia trachomatis gap-filling ligase chain reaction (Gap-LCR) assay. On testing of urine samples by the Gap-LCR assay and urethral swab specimens by cell culture, 73 (19%) Chlamydia trachomatis positive subjects were ...
E S, Berg +4 more
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The aim of this study was to assess the presence of inhibitors in urine specimens causing false-negative results in a commercial Chlamydia trachomatis gap-filling ligase chain reaction (Gap-LCR) assay. On testing of urine samples by the Gap-LCR assay and urethral swab specimens by cell culture, 73 (19%) Chlamydia trachomatis positive subjects were ...
E S, Berg +4 more
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European Journal of Plant Pathology, 1995
A previously reported method for polymerase chain reaction (PCR) detection ofGaeumannomyces graminis was modified to simplify it, improve its specificity and decrease the possibility of contamination of the assay. The modified method also allowed discrimination between theG.
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A previously reported method for polymerase chain reaction (PCR) detection ofGaeumannomyces graminis was modified to simplify it, improve its specificity and decrease the possibility of contamination of the assay. The modified method also allowed discrimination between theG.
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Low Human Immunodeficiency Virus Titer and Polymerase Chain Reaction False-Negatives
Journal of Infectious Diseases, 1992ZAZZI, MAURIZIO +3 more
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