A tomato root bioassay technique to estimateFusarium oxysporum lycopersici toxins

1965 ◽  
Vol 52 (22) ◽  
pp. 625-625
Author(s):  
A. Mahadevan ◽  
N. E. Caroselli
Keyword(s):  
Tomato Root ◽  
Root Bioassay ◽  
Bioassay Technique

Increasing the Sensitivity of the 15N Root Bioassay Technique: Suggested Procedures

2003 ◽  
Vol 34 (15-16) ◽  
pp. 2363-2373 ◽  
Author(s):  
Ulrika Rosengren ◽  
Darren Sleep ◽  
Helen E. Jones ◽  
Gunnar Thelin
Keyword(s):  
Root Bioassay ◽  
Bioassay Technique

Use of Tomato (Lycopersicon esculentum) Seedlings to Detect Bensulfuron and Quinclorac Residues in Water

1993 ◽  
Vol 7 (2) ◽  
pp. 376-381 ◽  
Author(s):  
Diego Gomez De Barreda ◽  
Elena Lorenzo ◽  
Emilio A. Carbonell ◽  
Baltasar Cases ◽  
Niceto Muñoz
Keyword(s):  
Lycopersicon Esculentum ◽  
Mediterranean Sea ◽  
Irrigation Water ◽  
Root Length ◽  
Rice Fields ◽  
Main Root ◽  
Tomato Root ◽  
Irrigation Network ◽  
Root Bioassay ◽  
The Mediterranean

During 1990, injury to tomatoes grown on the narrow land between the Albufera Lake (Spain) and the Mediterranean Sea was attributed to use of irrigation water coming from adjacent rice fields containing bensulfuron and quinclorac. A tomato root bioassay was developed to detect the herbicides in 10 ml of water. The assay was more sensitive to bensulfuron (0.5 ng ml−1) than quinclorac (100 ng ml−1). Only 30 ml of the affected water are necessary to conduct the test. Albufera water, sampled at three sites during 1991 and one during 1992 in the irrigation network canals caused different tomato main root length responses.

Determination of the Viability of Toxoplasma gondii in Cured Ham Using Bioassay: Influence of Technological Processing and Food Safety Implications

2010 ◽  
Vol 73 (12) ◽  
pp. 2239-2243 ◽  
Author(s):  
SUSANA BAYARRI ◽  
MARÍA J. GRACIA ◽  
REGINA LÁZARO ◽  
CONSUELO PÉREZ-ARQUILLUÉ ◽  
MONTSERRAT BARBERÁN ◽  
...  
Keyword(s):  
Toxoplasma Gondii ◽  
Horizontal Transmission ◽  
Meat Product ◽  
Immunofluorescence Assay ◽  
Nitrite Concentration ◽  
Bioassay Technique ◽  
Technological Processing ◽  
Undercooked Meat ◽  
Porcine Tissues

Toxoplasmosis is a zoonotic disease caused by the protozoan Toxoplasma gondii and distributed worldwide. Ingestion of viable cysts from infected raw or undercooked meat is an important route of horizontal transmission of the parasite to humans. Little information is available concerning the effect of commercial curing on cysts of T. gondii. This study is the first in which the influence of processing of cured ham on the viability of T. gondii has been evaluated, using bioassay to assess the risk of infection from eating this meat product. Naturally infected pigs were selected for the study, and a mouse concentration bioassay technique was used to demonstrate viable bradyzoites of T. gondii in porcine tissues and hams. No viable parasites were found in the final product (14 months of curing) based on results of the indirect immunofluorescence assay and histological and PCR analyses. Our results indicate that the consumption of hams cured as described here poses an insignificant risk of acquiring toxoplasmosis. However, additional studies are required to evaluate the safety of ham products cured under different conditions of curing time, salt, and nitrite concentration.

A STANDARDIZED BIOASSAY FOR LARVICIDAL ACTIVITY OF BACILLUS THURINGIENSIS IN SUNFLOWER MOTH HOMOEOSOMA ELECTELLUM (LEPIDOPTERA: PHYCITIDAE)

1985 ◽  
Vol 117 (1) ◽  
pp. 15-22 ◽  
Author(s):  
R. G. Lidstone ◽  
D. W. Goerzen ◽  
G. G. Khachatourians
Keyword(s):  
Bacillus Thuringiensis ◽  
Larvicidal Activity ◽  
Standard Test ◽  
Mortality Curve ◽  
Bioassay Technique ◽  
Sunflower Moth ◽  
Homoeosoma Electellum ◽  
Third Instar Larvae

AbstractA standard test for the larvicidal activity of Bacillus thuringiensis (B.t.) against the larvae of the sunflower moth Homoeosoma electellum (Hulst) has been developed. Bioassay parameters investigated include diet preparation, concentration of B.t., effect of formaldehyde, and method of pathogen incorporation in diet. The LC50 for seconded third-instar larvae is 1.24 μg of Dipel® WP ml−1 or 19.8 IU B.t. ml−1 pathogen-incorporated diet. Layering of a pathogen-suspension upon the surface of the diet was not a reliable bioassay technique for H. electellum. The addition of formaldehyde in the diet reduced the slope of the dose–mortality curve but did not change the LC50.

Development of a standard bioassay technique for the adults of Bemisia tabaci Gennadius (Homoptera, Aleyrodidae)

1976 ◽  
Vol 87 (3) ◽  
pp. 543-548
Author(s):  
M. S. El-Helaly ◽  
F. H. El-Gayar ◽  
A. Y. El-Shazli
Keyword(s):  
Bemisia Tabaci ◽  
Filter Paper ◽  
Exposure Period ◽  
Bioassay Technique

SummaryA standardized impregnated filter-paper bioassay technique was specially developed for screening insecticides against adults of the whitefly Bemisia tabaci Genn. (Homoptera, Aleyrodidae). It was found that the most suitable exposure period, after which mortality counts should be made, was 11·7 ± 2·1 h. Two different techniques for applying the insecticide solutions to the filter paper disks were tested and verified.

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