Natural Science Forum / Biology / Evolution / September 2005

Bacteria may have endless diversity
Comparative sequencing reveals enormous variation in genomes from horizontal
gene transfer
By Melissa Lee Phillips

Balls of Fire: Bees carefully cook invaders to death
Susan Milius
Honeybees that defend their colonies by killing wasps with body heat come
within 5°C of cooking themselves in the process, according to a study in

A question - well, several questions:
Generally, within an order of mammals, say, brain size scales with body size
(by some power law).  Does this mean proportionately larger nerve cells, or
does it mean proportionately more nerve cells?  Or both?

Divam said,
i would like clarify following things
what is
sun/heat cycle

during development of foetus all the organs and almost whole body is
formed from single embryo. but the germinal layers are extra-embryonic
in origin they develop outside the embryo. why is that they are not
formed with the whole body . if anyone know the answer to this please

human genom project is more important topic for genetic! and the
scientist made human gene maps! but is it enough for genetic more
protein's code are not serial on DNA! now I want to learn those. which
one is more important to solve their secret? Protein, RNA or DNA? and

I'm been fascinated by the cells ability to self replicate itself. I
made this binary cell model as an mathematical attempt to mimic the
binary division process that occurs in biological cells. This
presentation is a shortened version of this model - a more formal (and

Why Do We Invoke Darwin?
Evolutionary theory contributes little to experimental biology
By Philip S. Skell
Darwin's theory of evolution offers a sweeping explanation of the history of

Is there an assumption among some biologists today that acquired
characteristics are transmitted?
Let me explain my reason for asking:
Often comments appear in forums such as sbe, to the effect that we humans

Nature 437, 551-555 (22 September 2005) | doi: 10.1038/nature03983
DNA sequence and analysis of human chromosome 18
Chad Nusbaum et al
Chromosome 18 appears to have the lowest gene density of any human

Is evolution meant to explain the fossil record or the existence of
man or both or does it matter which?
thanks
Eric

I often asked myself as a layman, in which direction mankind will
develop without selection or gene manipulation.  By comparisons from
the animal world I came to the pessimistic conclusion that the journey
must inevitably go toward degeneration.  I wonder whether you view it

PIP
Here is the abstract, with some brief comments by me [inline in braces]
Abstract:
I attempt to sketch a unified picture of the origin of living

can I also use substitution probabilities instaed of "real distances"
by the distance-based reconstruction of phylogenetic trees? How should
gaps (after aligning) be estimate (which value)?
Ciao

okay even if AA  helps in inhibiting photolysis
i would like to know what are the ways a normal genetic material say
in our cells effected by photolysis. how can dna be photolysed under
normal conditions