Environmental changes induce a cellular response

[Snowy Owl]

Environmental changes induce a cellular response

[Cellular response to stress]
[Article in Spanish]

Eichelmann CG.

Departamento de Biologia Molecular y Biotecnolog?a, Instituto de Investigaciones Biom?dicas, Universidad Nacional Aut?noma de M?xico, Mexico, D. F. cargom@servidor.unam.mx

Environmental changes induce a cellular response characterized by a modification in the genetic expression and physiology of the cell.

This modification allows the cell to survive and adapt to the new environment.

Current studies on cellular stress response are mainly focused on the identification of the genetic expression patterns (transcriptome, proteome). and their relation with the biochemical (metabolome), structural and functional changes displayed by the cells under stress.

In the symposium on Cellular Response to Stress, four works were presented about the stress effect on cellular functions of bacteria and fungi:

1) nutritional stress in Escherichia coli and DNA damage and mutagenesis.

2) nutritional and oxidative stress in Candida glabrata and subtelomeric silencing,

3) cold stress in E. coli and RNA degradation, and

4) oxidative and heat stress in E. coli and differential protein synthesis.

PMID: 17578088 [PubMed - indexed for MEDLINE]

http://www.ncbi.nlm.nih.gov/sites/e...ez.Pubmed.Pubmed_ResultsPanel.Pubmed_RVDocSum

 

[Snowy Owl]

Re: Environmental changes induce a cellular response

interactions between the solar activity, seismic energy of the Earth and microbiological processes

[Correlation between the microbiological (S. aureus) and seismic activities with regard to the sun-earth interactions and neutron flux generation]
[Article in Russian]

Shestopalov IP, Rogozhin IuA.

The study searched for interactions between the solar activity, seismic energy of the Earth and microbiological processes in the period from 1969 to 1997. Microbiological processes were found dependent on as the solar, so intraterrestrial (e.g. seismic) activity. The 11-year seismic on biological cycles on Earth display a positive inter-correlation and a negative one with the solar activity (sun-spots cycles). There is also correlation between the Earth's seismic energy and neutron fluxes generated at the times of earthquakes on our planet, and microbiological parameters.

PMID: 16193922 [PubMed - indexed for MEDLINE]

http://www.ncbi.nlm.nih.gov/sites/e...med.Pubmed_ResultsPanel.Pubmed_RVAbstractPlus

 

[Snowy Owl]

Re: Environmental changes induce a cellular response

The 11-year cycle in human births.
Randall W, Moos WS.

Department of Psychology, University of Iowa, Iowa City 52242.

The annual numbers of human births were analyzed with regard to an 11-year cycle. The annual values were obtained from seven different regions: Australia, Germany, England and Wales, New Zealand, Japan, Switzerland, and the USA. Fifty-five annual values were obtained from each region for the years 1930 to 1984, comprising approximately five sunspot cycles. For each region the annual values were formed into 5 by 11 matrices; the eleven column means obtained were standardized, and plotted. A periodic regression technique, utilizing the fitting functions of the Fourier series, was used to evaluate the temporal order in the column means. Eleven-year rhythms were found and compared with solar and geophysical variables. Correlations were found with sunspots and solar flares, with terrestrial measures of magnetic disturbances (the magnetic indices derived from the K-index), and with temperature. The correlation of conceptions with the 11-year solar cycle may be a potential guide in the selection of further variables for the control and regulation of the rhythms in human conceptions.

PMID: 8330943 [PubMed - indexed for MEDLINE]

http://www.ncbi.nlm.nih.gov/sites/e...ez.Pubmed.Pubmed_ResultsPanel.Pubmed_RVDocSum

 

[Snowy Owl]

Re: Environmental changes induce a cellular response

A model of numbers of births in three countries, with persistent forty-year cycles.
Marshall AM.

PIP: This paper describes a model which relates fertility to partner availability, an aspect of relative cohort size. Partner availability is affected by the tendency for males to reproduce at a later age than females. For women born at a time of rising birth rates, there is a shortage of slightly older men as potential partners. Women born when birthrates are falling enjoy a surplus of older men from which to choose. This model is believed to be the first non-linear demographic feedback model involving feedbacks through marriage squeezes in which empirically estimated values of the parameters imply persistent limit cycles. The deterministic model makes births in each five-year period a function of births in previous five-year periods. The form of the function is chosen to model the effect of partner availability upon entry into reproductive relationships, and therefore on age-specific fertility. Marriage rates are not modeled directly. The model was developed from data for more than a century from England and Wales, New Zealand, and the US. The demographic transition is modeled with a logistic function and age-specific fertility rates are estimated using lognormal distributions. The stepwise inclusion of a partner availability estimate in the model showed that it accounts for 29% of otherwise unexplained variance. Projected future births stabilize in sustained or limit cycles with periods a little longer than 40 years, and amplitudes of at least 7% of the mean. The necessary conditions for cycle persistence are outlined on a graph of maximum and minimum fertility parameters.

PMID: 12290054 [PubMed - indexed for MEDLINE]

http://www.ncbi.nlm.nih.gov/sites/e...med.Pubmed_ResultsPanel.Pubmed_RVAbstractPlus