Natalia Jorgelina Fernández

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Varroa destructor is an ectoparasitic mite that affects colonies of honey bee Apis mellifera worldwide. In the last years, substances of botanical origin have emerged as natural alternative acaricides to diminish the population levels of the mite. In the present work, the bioactivity of propolis from different geographical locations of Pampean region from(More)
Immunohistochemical and histochemical stains are useful adjunct techniques in the diagnosis of canine cutaneous round cell tumors, which can appear histologically similar. We applied a panel of monoclonal antibodies (recognizing tryptase, chymase, serotonin for mast cells; CD1a, CD18, MHC class II for histiocytes; CD3 for T lymphocytes; CD79a for B(More)
A diverse set of parasites and pathogens affects productivity and survival of Apis mellifera honeybees. In beekeeping, traditional control by antibiotics and molecules of synthesis has caused problems with contamination and resistant pathogens. In this research, different Laurus nobilis extracts are tested against the main honeybee pests through an(More)
This study evaluated the activity of plant extracts on Nosema ceranae development and their toxicity on the infected host Apis mellifera. Newly emerged bees were fed ad libitum with enriched syrups after individual infection. Diets consisted of ethanolic extracts obtained from Artemisia absinthium, Allium sativum, Laurus nobilis, and Ilex paraguariensis(More)
Gradual filling of a chamber with carbon dioxide is currently listed by the Canadian Council on Animal Care guidelines as a conditionally acceptable method of euthanasia for rats. Behavioural evidence suggests, however, that exposure to carbon dioxide gas is aversive. Isoflurane is less aversive than carbon dioxide and may be a viable alternative, though(More)
Chemical modifications of clay to remove methylene blue (MB) from aqueous solutions at room temperature were compared. Natural bentonite (NC) was modified by cation exchange with hexadecyltrimethylammonium chloride (HC), bencyltriethylammonium chloride (BC), and tetramethylammonium chloride (TC) to reverse the surface polarity of the hydrophilic bentonite.(More)
In the eusocial honeybee, Apis mellifera, worker bees use a stinging apparatus for defense. The sting is supplied with venom by glands localized in the abdomen. Honeybee venom (BV) is composed of at least 18 bioactive molecules, ranging from biogenic amines to proteins whose structure and function have been largely determined. These include peptides such as(More)
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