Some Costly Eggs

The respiratory mechanisms of some insect eggs.

Artificial incubation of Muscovy duck eggs: why some eggs hatch and others do not.

This study was designed to gain insight into the influence of spraying and cooling, during artificial incubation, on the embryo metabolic rate and hatching ability of Muscovy duck eggs. Three times a week 93 incubated eggs were sprayed and cooled for 0.5 h at room temperature. Daily embryo metabolic rate was measured in 30 eggs with a water vapor conductance ranging from 1.15 to 2.07 mg/day-kPa...

Some Observations concerning Metakinesis in Sea Urchin Eggs

One of the more perplexing aspects of mitosis has been the na ture of the mechan ism whereby the chromosomes are moved into their metaphase configuration. Early theories of chromosome movemen t which involved the spindle or chromosomal fibers later gave way to theories proposing alternate mechanisms, as spindle fibers came to be regarded as artifacts of fixation. In recent years, however, evide...

Effects of Some Pesticides on Development of Ascaris suum Eggs

To evaluate the effects of pesticides to parasite eggs, Ascaris suum eggs were incubated with 5 different pesticides (1:1,500-1:2,000 dilutions of 2% emamectin benzoate, 5% spinetoram, 5% indoxacarb, 1% deltamethrin, and 5% flufenoxuron; all v/v) at 20℃ for 6 weeks, and microscopically evaluated the egg survival and development on a weekly basis. The survival rate of A. suum eggs incubated in n...

Costly Expertise

In many environments, expertise is costly. Costs can manifest themselves in numerous ways, ranging from the time that is required for a financial consultant to study companies’ performances, to the resources necessary for academic referees to produce knowledgeable reports, to the attention and thought needed for jurors to construct informed convictions. The current paper asks a natural question...