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Biology subjects

Barros, A. C.

Publications and source records attributed to Barros, A. C..

2 recordsLinked to original sources

Evaluation of radioprotective effect of chickpea (Cicer arietinum) in the survival of Lasioderma serricorne (Fabricius, 1972) (Coleoptera, Anobiidae) irradiated with 60Co

We investigated the presence of natural radioprotectors in food using a new technical modality that utilizes the insect Lasioderma serricorne as a radiosensitivity bioindicator to check radioprotection properties in minimally processed chickpeas. The insects were obtained from the entomological biotherium of the Laboratory of Radiobiology and Environment of CENA-USP. They were fed with an experimental diet and just when the first generation hatched completely, the experiments were conducted. The randomly chosen control diet, consisted of three parts of wheat germ, one part of brewers yeast, and a slice of French bread toasted in an oven previously set up for humidity control. The diet of chickpeas consists only of whole grains crushed in a mechanical grinder to obtain flour. The result was significant for the survival of insects (p<0.0001) reared on a diet of chickpeas compared to those reared on control diet irradiated with gamma rays from 60Co in the range of 5.0 to 1500 Gy. We presented statistical evidence that the chickpea diet has radioprotective properties in the insect for gamma rays.\n\nSUMMARY STATEMENTThe study is important because it shows that chickpea has protective properties against ionizing radiation, how to act against its biological effects and minimize them.

biophysics↗

Impact of Sexual Transmission to Sex-specific Attack Rates in Zika Epidemics

In 2015 and 2016 South America went through the largest Zika epidemic in recorded history. One important aspect of this epidemic was the impact on newborns due to the effect of Zika on development of the central nervous system leading to severe malformations. Another aspect of the Zika epidemic which became evident from the data was the importance of the sexual route of transmission leading to increased risk for women. Here propose a mathematical model for the transmission of the Zika virus including sexual transmission via all forms of sexual contact, as well as simplified vector transmission, assuming a constant availability of mosquitoes. From this model we derive an expression for[R] 0 which can be used to study and analyze the relative contributions of the different routes of Zika transmission and the male to female sexual transmission route vis-a-vis vectorial transmission. We also fit the model to data from the 2016 Zika epidemic in Rio de Janeiro, to estimate the values of key parameters of the model.

epidemiology↗