We review recent advances on glossopterid reproductive biology and their implications for seed plant phylogeny the ecology of this widespread Permian Gondwanan group. Microsporangiate organs are interpreted to have been arranged in loose compound cones—an organization that evokes comparisons with Ginkgoales, Cordaitales early conifers. The pollen was typically taeniate, bisaccate, primarily ada...

I soon learned that this was not an easy task. Scientific output is a precious commodity and appropriate "placement" of a manuscript is a carefully considered endeavour. To publish good work in a new journal with no impact index is regarded by many as waste of effort with a negligible effect on one's CV. This was more or less the tenor of some of the responses which I received to my solicitatio...

A comprehensive understanding of the reproductive biology and spawning activity of the tuna is necessary for sound management of this complex and important fishery. Current methods for assessing maturity schedules of tunas is based on the conventional approach of collecting gonads for detailed histological examination. While this method has proven to be accurate and provides valuable informatio...

Butterflies of the neotropical Genus Heliconius feed on pollen. This is the first known instance in butterflies of a habit that is well known for other insects. The butterflies remove amino acids and proteins from pollen; this feeding innovation plays a role in the reproductive and population biology of these insects. It is suggested that other animals may use pollen in a similar fashion.

FGSS118 Reproduction in the 21st Century This course will cover basic human reproductive biology, new and future reproductive and contraceptive technologies, and the ethics raised by reproductive issues. Offering: Crosslisting Grading: A-F Credits: 1.00 Gen Ed Area: NSM-BIOL, NSM-BIOL, NSM-BIOL, NSM-BIOL, NSM-BIOL Identical With: BIOL118, PHIL118, SISP118, BIOL118, PHIL118, BIOL118, PHIL118, BI...

The generation of functional sperm in vitro has been a goal for almost a century. Until recently, researchers have only succeeded in reproducing the early steps of spermatogenesis. This is not surprising given that spermatogenesis is a complicated process that requires the coordinated efforts of germ cells and several somatic cells within the tubular structure of the testis. Finally-last year-S...

The certitude of death makes reproduction the foundation upon which all life-history strategies are based. Plasticity in the reproductive biology of organisms is an essential adaptive response to the capricious and hazardous environments of earth. In this article, we use data from a breeding colony for laboratory mice to examine the mortality risks of offspring born at the outer boundaries of t...