Caffeine effectively protects DNA against ionizing radiation in a system devoid of repair and replication machinery. Thus, DNA protection shown by caffeine is possibly due to the scavenging of radiation-derived primary as well as secondary reactive oxygen species, and this physicochemical protective pathway possibly pre-empts any subsequent inhibitory effect of caffeine on the enzymatic repair of DNA.

The results suggest that caffeine effectively protected membranes against the oxic component of damage but may not do so for the anoxic component.

No abstract

Scientists use popular media to share views or facilitate greater understanding of their work. Social media also offers scientists the opportunity to build public opinion. Hailed as one of three most influential Indians of the 20th century by Time Magazine 1 , renowned agriculture scientist M. S. Swaminathan has written prolifically in scientific and mainstream media. From March 2015, for a period of one year, his use of social media platform Twitter is being taken up as a case study of social media communication by scientists. This article analyses themes articulated by a scientist on social media and finds that this provides an entry for discussions on science and development. Through this study, it is suggested that scientists, especially in India, can intervene more actively, for greater authenticity, accuracy and understanding among social media users on scientific subjects.

Space-grade Si and GaAs solar cells were irradiated with 15 & 40 MeV Li ions. Illuminated (AM0 condition) and unilluminated I-V curves reveal that the effect of high-energy Li ion irradiation has produced similar effects to that of proton irradiation. However, an additional, and different, defect mechanism is suggested to dominate in the heavier-ion results. Comparison is made with proton-irradiated solar-cell work and with non-ionizing energy-loss (NIEL) radiation-damage models.