Papers by Gerson Calderon
Phytochemistry Reviews, 2011
Beekeeping has always been vulnerable to various sanitary drawbacks. The mite Varroa destructor (... more Beekeeping has always been vulnerable to various sanitary drawbacks. The mite Varroa destructor (Mesostigmata: Varroidae), an obligated ectoparasite of honeybees, has been in recent times one of the major problems leading not only to economical losses but also to ecological problems related to the role of honeybees as the most important pollinators on Earth. Varroatosis has been treated by methods that include special practices of beekeeping, physical removal, and the use of synthetic acaricides. None of these methods have, however, rendered complete protection, and there is clear evidence for the evolution of resistance to conventional acaricides. Consequently, the need for alternative control means has prompted the onset of several prospecting programs on botanicals with anti-varroa potential. Among these, essential oils appear as good candidates for safer control. In this review, we provide a concise compilation of the information generated in the last years on essential oils with anti-varroa activity. Future developments in this area demand standardization of bioassay protocols (either in the laboratory for primary screening or in hives), a detailed chemical characterization of the essential oils tested, and comprehensive studies on application methods.
http://students. sfu. ca/ …
Reproductive Health, 2009
Background: A review of validated methods for assessing female sexual dysfunction and a review of... more Background: A review of validated methods for assessing female sexual dysfunction and a review of male and female sexual dysfunction did not refer to any specific questionnaire for evaluating sexuality during pregnancy. A study was performed at the Obstetrics and Gynecology Department of Botucatu Medical School, São Paulo State University, Brazil to design and validate a pregnancy sexuality questionnaire, the Pregnancy Sexual Response Inventory (PSRI).
Am. J. Trop. Med. …, 2008
Trypanosoma cruzi polymerase chain reaction (PCR) is widely used, but sensitivity varies widely. ... more Trypanosoma cruzi polymerase chain reaction (PCR) is widely used, but sensitivity varies widely. We compared PCR using 121/122 primers targeting kinetoplast minicircle DNA in whole blood, buffy coat, and clot from Bolivian women. Sensitivity was significantly higher in clot (60.1%) than buffy coat (46.5%) or whole blood (40%). The use of clot could simplify specimen collection while improving sensitivity.
PLoS neglected tropical …, 2010
Background: Patients with Chagas disease have migrated to cities, where obesity, hypertension and... more Background: Patients with Chagas disease have migrated to cities, where obesity, hypertension and other cardiac risk factors are common.
Clinical infectious …, 2009
See the article by Laucella et al, on pages 1675-84, and the editorial commentary by Urbina, on p... more See the article by Laucella et al, on pages 1675-84, and the editorial commentary by Urbina, on pages 1685-7.)
The FASEB journal, 2006
Exposure of several human populations to arsenic has been associated with a high incidence of det... more Exposure of several human populations to arsenic has been associated with a high incidence of detrimental dermatological and carcinogenic effects. To date, studies examining the immunotoxic effects of arsenic in humans, and specifically in children, are lacking. Therefore, we evaluated several parameters of immunological status in a group of children exposed to arsenic through their drinking water. Peripheral blood mononuclear cells (PBMCs) of 90 children (6 to 10 years old) were collected. Proportions of lymphocyte subpopulations, PBMC mitogenic proliferative response, and urinary arsenic levels were evaluated. Increased urine arsenic levels were associated with a reduced proliferative response to phytohemaglutinin (PHA) stimulation (P=0.005), CD4 subpopulation proportion (P=0.092), CD4/CD8 ratio (P=0.056), and IL-2 secretion levels (P=0.003). Increased arsenic exposure was also associated with an increase in GM-CSF secretion by mononucleated cells (P=0.000). We did not observe changes in CD8, B, or NK cell proportions, nor did we observe changes in the secretion of IL-4, IL-10, or IFN-γ by PHA-activated PBMCs. These data indicate that arsenic exposure could alter the activation processes of T cells, such that an immunosuppression status that favors opportunistic infections and carcinogenesis is produced together with increased GM-CSF secretion that may be associated with chronic inflammation.
Journal of Synchrotron Radiation, 1999
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Papers by Gerson Calderon