Quantitative Biology

1403 Submissions

[3] viXra:1403.0117 [pdf] submitted on 2014-03-13 00:43:56

Son Birth and Female Lifespan Are Positively Related in Humans

Authors: Madhukar Shivajirao Dama
Comments: 20 Pages.

Sexual dimorphism of human body size starts as early as first trimester of fetal development [1]. Compared to daughters, sons develop faster [2] and weigh 2-3% higher at birth [3]. This dimorphism is believed to create an investment dimorphism for mothers, such that, women bearing sons tend to incur higher physiological investment costs. Further, analysis of human populations has shown that mothers bearing more sons require longer time to reproduce again [4]. These observations lead to the prediction that mothers bearing more sons may need to trade the physiological investments with lifespan [5].
Category: Quantitative Biology

[2] viXra:1403.0115 [pdf] submitted on 2014-03-13 01:10:34

Offspring Sex-Ratio in Humans – Does it Depend on Population Size?

Authors: Madhukar Shivajirao Dama
Comments: 18 Pages.

Balanced sex ratio evolves by a process known as frequency-dependent selection of the minority sex. Efforts to test this theory have focused mainly on experimental populations. Heterogametic sex has greater influence over the sex of the offspring. We tested the prediction that a smaller human population should favor male offspring. Our findings reveal that size of the population has significant inverse correlation with male proportion. We also present evidence for frequency-dependent selection of the minority sex and evolution of balanced sex ratio in isolated human population.
Category: Quantitative Biology

[1] viXra:1403.0003 [pdf] submitted on 2014-03-01 03:35:45

Increasing Quality of Separation of Shelled Peanuts by X-Rays and ir Technologies

Authors: Yakov Gershman
Comments: 4 Pages.

One of the important requirements of the market to peanuts in shell is the lack of incompletely filled with fruit. Traditional mechanical sorting methods cannot solve the problem completely. In this work experimentally proved the possibility of the complete removal of immature fruits ("singles") by using image processing of x-ray and infrared.
Category: Quantitative Biology