Determination of residual enrofloxacin in eggs due to long term administration to laying hens. Analysis of the consumer exposure assessment to egg derivatives

2021 ◽  
Vol 351 ◽  
pp. 129279
Author(s):  
Carla M. Teglia ◽  
María Guiñez ◽  
María J. Culzoni ◽  
Soledad Cerutti
Keyword(s):  
Exposure Assessment ◽  
Laying Hens ◽  
Term Administration

scholarly journals Transmission of Residues to Eggs Following Long-Term Administration of 14 C-Labelled Deoxynivalenol to Laying Hens

1989 ◽  
Vol 68 (6) ◽  
pp. 744-748 ◽  
Author(s):  
D.B. PRELUSKY ◽  
R.M.G. HAMILTON ◽  
H.L. TRENHOLM
Keyword(s):  
Laying Hens ◽  
Term Administration

Determination of Intracellular Magnesium by an Automatic Titration Procedure

1960 ◽  
Vol 6 (6) ◽  
pp. 564-571 ◽  
Author(s):  
Donald A Sones ◽  
Warren F McGuckin ◽  
Khalil G Wakim
Keyword(s):  
Magnesium Concentration ◽  
Normal Range ◽  
Intracellular Magnesium ◽  
Titration Procedure ◽  
Term Administration ◽  
Original Procedure ◽  
Increase In Accuracy ◽  
Automatic Titration

Abstract Our experiences with the automatic titration method of quantitating serum calcium and magnesium are presented. In addition, modifications of the original procedure to allow determination of intraerythrocyte concentrations of magnesium are described. It appears that adoption of a separate magnesium standard in addition to the calcium standard, plus certain other minor modifications designed to minimize the variables inherent in the procedure, provides a significant increase in accuracy and reproducibility of results. Values for intraerythrocyte magnesium concentration in 9 normal dogs were found to range from 4.69 to 5.77 mg./100 ml. Values for 4 dogs that received long-term administration of chlorothiazide also fell within this normal range.

Effects of Oral and Intravenous Calcitriol on Serum Calcium Oxalate Saturation in Dialysis Patients

1993 ◽  
Vol 85 (3) ◽  
pp. 309-314 ◽  
Author(s):  
Martino Marangella ◽  
Corrado Vitale ◽  
Domenico Cosseddu ◽  
Michele Petrarulo ◽  
Franco Linari
Keyword(s):  
Calcium Oxalate ◽  
Serum Calcium ◽  
Calcium Phosphates ◽  
Blood Chemistry ◽  
Degree Of Saturation ◽  
Dialysis Treatment ◽  
Term Administration ◽  
Regular Dialysis Treatment

1. To determine whether the multiple changes in the blood chemistry profile induced by calcitriol may be conducive to secondary systemic oxalosis we have studied nine patients on regular dialysis treatment under three different regimens: (1) oral calcitriol, 0.25 μg/daily for at least 6 months. (2) off calcitriol, a 1-month withdrawal of the drug, taken as the baseline study period; (3) intravenous calcitriol, 1 μg three times weekly at the end of dialysis, with tests performed at 1 and 3 months from initiation. 2. Serum concentrations were measured pre- and post-dialysis at the end of each study period. The whole dialysate was used for the determination of the overall calcium and oxalate removal by dialysis. The degree of saturation with calcium oxalate mono-hydrate was estimated by a computer program. Serum calcitriol concentrations were also assessed. 3. Total and ionized serum calcium did not change on average, although mild hypercalcaemia developed in some patients on intravenous calcitriol. There was an increase in plasma level of oxalate during both oral and intravenous calcitriol treatment, but this was less pronounced during intravenous therapy. Removal of oxalate by dialysis was also greater in patients on oral calcitriol. 4. These increases were probably originated from intestinal absorption and secondary to hyper-absorption of dietary calcium. Consequently, the degree of saturation with calcium oxalate before dialysis rose during calcitriol treatment, irrespective of the route of administration. 5. These results emphasize that, in addition to soft tissue calcification due to calcium phosphates, ectopic calcium oxalate crystallization must also be viewed as a potential risk associated with long-term administration of calcitriol.

Long‐term administration of low doses of mycotoxins to poultry. 1. Residues of aflatoxin B1and its metabolites in broilers and laying hens

1988 ◽  
Vol 5 (3) ◽  
pp. 303-308 ◽  
Author(s):  
C. Micco ◽  
M. Miraglia ◽  
R. Onori ◽  
C. Brera ◽  
Al. Mantovani ◽  
...  
Keyword(s):  
Laying Hens ◽  
Low Doses ◽  
Term Administration

Preparation And elemental analysis of ancient fibers

1987 ◽  
Vol 45 ◽  
pp. 410-411
Author(s):  
Allen Angel ◽  
Kathryn A. Jakes
Keyword(s):  
Cross Sections ◽  
Physical Structure ◽  
Energy Dispersive ◽  
Archaeological Sites ◽  
X Ray ◽  
Long Term Storage ◽  
Backscattered Electron ◽  
Electron Imaging

Fabrics recovered from archaeological sites often are so badly degraded that fiber identification based on physical morphology is difficult. Although diagenetic changes may be viewed as destructive to factors necessary for the discernment of fiber information, changes occurring during any stage of a fiber's lifetime leave a record within the fiber's chemical and physical structure. These alterations may offer valuable clues to understanding the conditions of the fiber's growth, fiber preparation and fabric processing technology and conditions of burial or long term storage (1).Energy dispersive spectrometry has been reported to be suitable for determination of mordant treatment on historic fibers (2,3) and has been used to characterize metal wrapping of combination yarns (4,5). In this study, a technique is developed which provides fractured cross sections of fibers for x-ray analysis and elemental mapping. In addition, backscattered electron imaging (BSI) and energy dispersive x-ray microanalysis (EDS) are utilized to correlate elements to their distribution in fibers.

The efficacy and safety of long-term administration of alpha-interferon and lamivudine in patients with chronic hepatitits B

2001 ◽  
Vol 120 (5) ◽  
pp. A572-A572
Author(s):  
F JABOLI ◽  
E RODA ◽  
C FABBRI ◽  
S MARCHETTO ◽  
F FERRARA ◽  
...  
Keyword(s):  
Alpha Interferon ◽  
Efficacy And Safety ◽  
Term Administration

Improvement Of Curvilinear Diagrams Of Concrete Deformation

2019 ◽  
pp. 99-104
Keyword(s):  
Reinforced Concrete ◽  
Peak Load ◽  
Experimental Studies ◽  
Concrete Structures ◽  
Deformation Model ◽  
Reinforced Concrete Structures ◽  
Significant Difference ◽  
Deformation Diagrams

Problems when calculating reinforced concrete structures based on the concrete deformation under compression diagram, which is presented both in Russian and foreign regulatory documents on the design of concrete and reinforced concrete structures are considered. The correctness of their compliance for all classes of concrete remains very approximate, especially a significant difference occurs when using Euronorm due to the different shape and sizes of the samples. At present, there are no methodical recommendations for determining the ultimate relative deformations of concrete under axial compression and the construction of curvilinear deformation diagrams, which leads to limited experimental data and, as a result, does not make it possible to enter more detailed ultimate strain values into domestic standards. The results of experimental studies to determine the ultimate relative deformations of concrete under compression for different classes of concrete, which allowed to make analytical dependences for the evaluation of the ultimate relative deformations and description of curvilinear deformation diagrams, are presented. The article discusses various options for using the deformation model to assess the stress-strain state of the structure, it is concluded that it is necessary to use not only the finite values of the ultimate deformations, but also their intermediate values. This requires reliable diagrams "s–e” for all classes of concrete. The difficulties of measuring deformations in concrete subjected to peak load, corresponding to the prismatic strength, as well as main cracks that appeared under conditions of long-term step loading are highlighted. Variants of more accurate measurements are proposed. Development and implementation of the new standard GOST "Concretes. Methods for determination of complete diagrams" on the basis of the developed method for obtaining complete diagrams of concrete deformation under compression for the evaluation of ultimate deformability of concrete under compression are necessary.

STUDIES IN THE SUPPOSED GOITROGENOUS EFFECT OF TAP WATER IN HELSINKI

1960 ◽  
Vol XXXIII (IV) ◽  
pp. 630-636
Author(s):  
F.-E. Krusius ◽  
P. Peltola
Keyword(s):  
Tap Water ◽  
Physiological Saline ◽  
Normal Weight ◽  
The Body ◽  
Iodine Uptake ◽  
Redistilled Water ◽  
Detectable Difference ◽  
Term Administration ◽  
Long Term Experiment

ABSTRACT The study reported here was performed in order to examine the tap water of Helsinki for its alleged goitrogenous effect. In a short-term, 24-hour experiment with rats, kept on an iodine-poor diet, we noticed no inhibition of the 4-hour 131I uptake, as compared with that of animals receiving physiological saline instead of tap water. Two similar groups of rats receiving 1 and 2 mg of mercazole in redistilled water showed a distinct blockage of the 4-hour uptake, which proved the effect of this substance. In a long-term experiment of 5 weeks' duration there was no detectable difference in the body weight, thyroid weight and the 4-hour 131I uptake when the rats receiving tap water or distilled water to which 0.45 per cent of sodium chloride was added were compared with each other. Replacement of tap water by a 10 mg per cent solution of mercazole in redistilled water enlarged the thyroid to double its normal weight and increased the 131I uptake to approximately five times that of the controls. Thus our experiments failed to demonstrate any goitrogenous effect in the tap water of Helsinki. Changes similar to those produced by a long-term administration of mercazole, i. e. an enlargement of the thyroid and an increased thyroidal iodine uptake, have been shown to be due to milk collected from goitrous areas. The observations here reported confirm the importance of milk in the genesis of the goitre endemia of Helsinki. Attention is further called to the fact that a thyroidal enlargement combined with an increased thyroidal iodine uptake cannot always be taken as a sign of iodine deficiency because similar changes may be produced by the administration of goitrogens.

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