HDTenEightyP/NetNews huggingface dataset:
From: barkdoll@cattell.psych.upenn.edu (Edwin Barkdoll)
Newsgroups: sci.bio
Subject: Re: Interesting Optical Illusion
Date: 6 Nov 92 20:54:08 GMT
Organization: University of Pennsylvania

In article <759@capmkt.COM> charles@capmkt.COM (Charles Neveu) writes:
>barkdoll@cattell.psych.upenn.edu (Edwin Barkdoll) gaffs:

[stuff deleted]
>>	Moire patterns at least as we are discussing them here are not
>>the result of interference, rather they result from teh simple
>>summation of spatial patterns.
>
>Interference is simple summation. 

	Guess its too late to cancel the article without any one
reading that...

	BTW for anyone who likes Moire patterns there's an interesting
article in May 1963 Sci Am pp 54-63: "Moire Patterns" by Gerald Oster
and Yasunori Nishijima.

Edwin Barkdoll
barkdoll@cattell.psych.upenn.edu
eb3@world.std.com
Newsgroups: sci.bio
From: simonb@extro.ucc.su.OZ.AU (Simon Blomberg)
Subject: Re: Attenborough [again]
Organization: Sydney University Computing Service, Sydney, NSW, Australia
Date: Thu, 5 Nov 1992 07:19:52 GMT

rising@zoo.toronto.edu (Jim Rising) writes:

>Perhaps enough has been said about this, but to try to answer a 
>question posted, in the first quote (the one about the spiders), 
>the part where he writes:  "But in terms of the success of the
>species...that individual disaster is of limited consequence:  he
>lost his life after...he had completed his purpose."  My objection
>to this is that it implies that the purpose of the spider's 
>reproductive behavior is to assure the success of the species,
>& most evolutionary biologists think that that's backwards.
>Presumably the spider behavior evolved because it increased
>individual fitness; in this instance, it is quite possible that
>the best strategy for females (copulate, then get a meal) is in
>conflict with the best strategy for males (copulate, and get the
>hell out, and try to mate again).  If he has little chance of
>mating a second time, and by feeding himself to his mate he
>significantly increases her success in raising their young
>(i.e., he can be reasonably certain of paternity), then he
>should "relax, and think of the queen--no, his own fitness!"
>The fact that he apparently has been selected to try to get
>away suggests that this ain't so, however.


You have to remember also that natural selection doesn't necessarily
produce perfection, rather only solutions that are "good enough" under
the present conditions.  Also, natural selection is constrained to
work with the genetic variation that is available. Presumably the
spiders are constrained in what they can do by conflicting selection
pressures (producing trade-offs) and by their evolutionary history
(phylogeny). Under most conditions, the best solution for a male
spider when faced with a potential predator would be to "get the hell
out of there" :-), and their behaviour would have evolved accordingly.
After fertilizing the female, the spider's sensory system might perceive
the female as just another predator, and engage the usual predator response.
_If_ the spider has the genetic flexibility to overcome the usual predator
response and offer itself as a meal to the female (a big "if", in my book),
then selection for that behaviour _may_ occur, under the conditions 
 that you mentioned. 
 
Stephen Jay Gould wrote an interesting essay on the subject of sexual
cannibalism ("Only his wings remained" - republished in the collection 
"The Flamingo's Smile"). In it he questions whether the phenomenon has
really been well established. For black widows, he notes that there
are several reports in the literature of males not retreating, but
the females don't eat 'em either. Gould also gives references to the
primary literature.

Simon Blomberg                        simonb@extro.ucc.su.OZ.AU
Zoology A08
School of Biological Sciences
University of Sydney
NSW   2006
Australia
From: dws@forager.unl.edu (David Stephens)
Newsgroups: sci.bio
Subject: Oops!
Date: 7 Nov 92 18:38:59 GMT
Organization: University of Nebraska--Lincoln
NNTP-Posting-Host: forager.unl.edu

Sorry about the duplicate postings, but nn kept telling me that
my postings failed, when evidently they didn't.

--dave.



-- 
-------------------------------------------------------------
Dave Stephens                                    402-472-2757
School of Biological Sciences               Fax: 402-472-2083
University of Nebraska, Lincoln
From: dws@forager.unl.edu (David Stephens)
Newsgroups: sci.bio
Subject: Re: Search for Software <help me>
Date: 6 Nov 92 22:06:21 GMT
Organization: University of Nebraska--Lincoln	
Distribution: world
NNTP-Posting-Host: forager.unl.edu

Here are some bits and pieces.  I'd be very interested in a more
authoritative list, since I just been put in charge of our "computers
in biology" instruction committee.

-There's a mac program called HyperCell for cell physiology that's
impressed some of our cell people.  I don't know much about it
really.  I've heard the graphics are good.

-There's a nice shareware ecology program called Populus for population
ecology written primarily by Don Alstad at Minnesota.  You can find
his e-mail address by fingering alstad@umn.edu.  

-Some folks seem to like a program called Stella (for Macs) that can
be used to model dynamic systems with boxes, flows and controls of
various kinds.

-We've also used MathCad (leslie matrices, chaos in the discrete
logistic) and Mathematica (numerical differential equation solving
e.g. the lotka-volterra systems) for ecology labs here. 

dave stephens
-------------------------------------------------------------
Dave Stephens                                    402-472-2757
School of Biological Sciences               Fax: 402-472-2083
University of Nebraska, Lincoln
Lincoln, NE 68588
-- 
-------------------------------------------------------------
Dave Stephens                                    402-472-2757
School of Biological Sciences               Fax: 402-472-2083
University of Nebraska, Lincoln
Newsgroups: sci.bio
From: tony@zoo.toronto.edu (Anthony L. Lang)
Subject: Re.: which bird has binocular vision
Date: Sun, 8 Nov 1992 19:06:41 GMT
Organization: U of Toronto Zoology

>
>What is the only bird that has binocular vision?
>
All of the 9000 species of bird have at least limited 
binocular vision, including
familiar birds such as robins that have eyes on their sides
of their head.  However, the amount of the arc where the two
fields of vision overlap in front is fairly small (I have
forgotten exactly how many degrees exactly, but it is
probably on the order of under 10 degrees).  
Hawks, eagles, and falcons have more binocular 
vision, which is not surprising since
they need 3-D vision for capturing prey efficiently.
Owls (about 35 species
in two families, both of which are in the same order) have
the most extensive binocular vision.  It is similar to the
amount that humans have.  Woodcocks (Scolopax sp., family
Scolopacidae, Order Charadriiformes) have binocular vision
both forwards and backwards.  There eyes are place high
on the head, so the bill doesn't interfere much, and 
are also placed far enough back on the head to allow
the binocular vision in back.  These two fields of binocular
vision are limited, of course.
-- 
Anthony Lang
Dept. of Zoology, Univ. of Toronto
tony@zoo.utoronto.ca
From: charles@capmkt.COM (Charles Neveu)
Newsgroups: sci.bio
Subject: Re: Interesting Optical Illusion
Date: 5 Nov 92 22:33:15 GMT
Organization: Capital Market Technology

barkdoll@cattell.psych.upenn.edu (Edwin Barkdoll) writes:

>In article <758@capmkt.COM> charles@capmkt.COM (Charles Neveu) writes:
>>barkdoll@cattell.psych.upenn.edu (Edwin Barkdoll) writes:
>>>In article <68666@cup.portal.com> mmm@cup.portal.com (Mark Robert Thorson) writes:
>>>>Another interesting effect I have noticed is that if you stand about
>>>>four or five feet away from a window screen or screen door, you can see
>>>>bands of light and dark in the screen.  I believe this is due to a sort
>>>>of Moire pattern, in which the screen as projected on the retina is about
>>>>the same spatial frequency as the array of rods and cones.

>>>	I suspect that the phenomenon you observe is related to
>>>so-called spurious resolution.  As frequency increases contrast falls
>>>to zero, reverses phase, goes to zero, reverses phase..

>>Was there a window behind the screen? If so, I think the original
>>poster was right: it is a Moire pattern.

>	The poster proposed that the effect was a result of
>photoreceptor spacing NOT a Moire pattern _projected_ onto the retina.

Ooops. Skimmed it to fast. 

>>It is the interference
>>between the screen and the reflection of the screen on the window.

I still don't think spurious resolution is the explanation. 
The original poster (you still there?) said bands of light and dark,
meaning, I assume, bands of lower frequency than screen frequency.
Spurious resolution causes phase changes, not frequency changes, as a
result of the high frequency roll-off of the optical system. 
So, if the bands are the same frequency as the screen, then it's
spurious resolution, but if they are lower, then I'll bet on Moire.

>	Moire patterns at least as we are discussing them here are not
>the result of interference, rather they result from teh simple
>summation of spatial patterns.

Interference is simple summation. 

Charles Neveu (neveu@milo.berkeley.edu)
Neurology Unit
Program in Physiological Optics
UCBerkeley
Newsgroups: sci.bio
From: rising@zoo.toronto.edu (Jim Rising)
Subject: Wolves in Yellowstone (cont.)
Date: Fri, 6 Nov 1992 20:53:35 GMT
Organization: U of Toronto Zoology

This is the continuation of a post I started this a.m., but was
interrupted by a computer glitch.

For the Yellowstone options, I cannot imagine that building
a fence around the Park would be realistic or effective, and
it would be very expensive.  I think that rancher should be
reimbursed for lost livestock, and doubt that that would be
very expensive, though subject to fraud.
-- 
Name:     Jim Rising
Mail:     Dept. Zoology, Univ. Toronto, Toronto, Ontario, Canada    M5S 1A1
UUCP:     uunet!attcan!utzoo!rising 
BITNET:   rising@zoo.utoronto.ca
From: bmb11@cus.cam.ac.uk (B.M. Bolker)
Newsgroups: sci.bio
Subject: Re: Wolves in Yellowstone
Date: 8 Nov 92 12:29:10 GMT
Organization: U of Cambridge, England

<< stuff about classical conditioning of wolves -- by nasty-tasting
chemicals -- not to eat livestock -- deleted.  Interesting idea. >>

   How many generations would it take to for wolves to evolve the
trait of not caring about the chemical?  There could be a pretty
large fitness benefit to being able to ignore the chemical and
eat livestock anyway ...
   (It's still an interesting idea, though.)

-- 
-----------------------------------------------------
Benjamin Bolker      Cambridge Univ. Dep't of Zoology
bmb11@cus.cam.ac.uk (Internet), bmb11@uk.ac.cam.cus (JANET)
From: sevenup@netcom.com (Mark W. Moorcroft)
Newsgroups: sci.bio
Subject: Re: Wolves & people
Date: 6 Nov 92 08:34:44 GMT
Organization: Netcom - Online Communication Services (408 241-9760 guest)

--------The subject: Wolves & people 
Pearls of wisdom by: rising@zoo.toronto.edu (Jim Rising)


>Snarky comments aside, I believe that there are NO documented
>cases of wolves attacking living humans in North America.


But I believe there are PLENTY of cases of humans domesticating wolves
quite succesfully and I know one personally.  He claimed that it was
very family oriented, VERY territorial (i.e. it would not chase an
intruder past the property line, unlike most dogs), it never got
fleas, and was very intelligent.  I'm not sure I agree with
domesticating any wild animal but thats another discussion.


>-- 
>Name:     Jim Rising
>Mail:     Dept. Zoology, Univ. Toronto, Toronto, Ontario, Canada    M5S 1A1
>UUCP:     uunet!attcan!utzoo!rising 
>BITNET:   rising@zoo.utoronto.ca





-- 

^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 Mark W. Moorcroft -- sevenup@netcom.COM -- C.I.S. 70741,325
-------------------------------------------------------------
  "I speak for myself and those who agree with me !"   ;-)
Xref: sparky sci.bio:4032 bionet.plants:560 bionet.general:1855 sci.med:20552
From: frist@ccu.umanitoba.ca
Newsgroups: sci.bio,bionet.plants,bionet.general,sci.med
Subject: Seeking a modern text for cytogenetics
Date: 5 Nov 92 17:08:19 GMT
Organization: University of Manitoba, Winnipeg, Manitoba, Canada
Originator: frist@riker.cc.umanitoba.ca

I am looking for a textbook appropriate for an undergraduate course in
introductory cytogenetics. The course that I teach along with a colleague
attempts to retain the main elements of a classical course in cytogenetics,
integrated with a more modern molecular biological approach.  In the past
the course used Schultz & Schafer as a recommended text for the "classical
cytogenetics", and Darnell et al. Molecular Cell Biology for the material
on chromatin, genome organization and chromosome structure. 
I dislike making these distinctions, and would like to be able
to teach this course as an integrated body of knowledge.

Has anyone written a more recent text that brings cytogenetics into the
1990's (or even the 1980's?). None of the texts I've seen do this.

===============================================================================
Brian Fristensky                | 
Department of Plant Science     |
University of Manitoba          |  I'm gonna miss DAN-O!
Winnipeg, MB R3T 2N2  CANADA    |  
frist@ccu.umanitoba.ca          |  :-)  :-) :-) 
Office phone:   204-474-6085    | 
FAX:            204-261-5732    |
===============================================================================
Newsgroups: sci.bio
From: bmb11@cus.cam.ac.uk (B.M. Bolker)
Subject: Re: Search for Software <help me>
Keywords: population dynamics
Organization: U of Cambridge, England
Date: Fri, 6 Nov 1992 21:27:48 GMT

	We got a disk with a reasonably nice piece of (free) teaching
software on it, called POPULUS 1.43.  It does a few predator-prey
models, coevolutionary models, etc.  The names that appear on it
are Dr. David Tilman, Univ of Minnesota, and Don Alstad, Dep't of
Ecology, Evolution and Behavior, U Minn, 318 Church St., SE
Minneapolis, MN, USA 55455-0302 612-625-0488, DNA@UMNACVX.bitnet.  We
haven't used it much (a commercial, although *extremely* good value
piece of software called PHASEPLANE (about $50 the last time I
checked, by Bard Ermentrout (phase@pittvms.bitnet), published by
Brooks/Cole publishing company, fits into our syllabus better), but it
might certainly be worth taking a look at.
	I have no connection with any of these people except using
their software.
	Hope this helps someone.



-- 
-----------------------------------------------------
Benjamin Bolker      Cambridge Univ. Dep't of Zoology
bmb11@cus.cam.ac.uk (Internet), bmb11@uk.ac.cam.cus (JANET)
Xref: sparky sci.bio:4117 sci.med:20909 alt.3d:1495 comp.graphics:11824
From: mystical@nmt.edu (Gurupartap Davis)
Newsgroups: sci.bio,sci.med,alt.3d,comp.graphics
Subject: Re: Request for Human Skeleton
Date: 11 Nov 92 17:12:07 GMT
Article-I.D.: nmt.1992Nov11.171207.12452
Distribution: na
Organization: New Mexico Tech

article <1992Nov7.200216.25185@spdcc.com> dyer@spdcc.com (Steve Dyer) writes:

>Not to dwell on the macabre, but the big science museum in Chicago
>(the one on the lake--I forget its name) has a (very, very, very old)
>exhibit where a cadaver has been sliced top-to-bottom in something like
>1/2" slices and encased in lucite or something similar.  These are then
>mounted on a hinge, so you can "flip thru" them like the pages of a book.
>
>This must date from before the 50's.

I remember seeing that on Ripley's Beleive it ir not several years ago.
I think they said it was pretty new then.

Partap Davis
mystical@jupiter.nmt.edu



-- 
------------------------------------------------------------------------------
Gurupartap Davis         |I don't have any employers, and if I did, they
mystical@jupiter.nmt.edu |probably wouldn't care about my opinions.
------------------------------------------------------------------------------
Xref: sparky sci.bio:4034 sci.med:20560 alt.3d:1427 comp.graphics:11532
From: amigan@cup.portal.com (R Michael Medwid)
Newsgroups: sci.bio,sci.med,alt.3d,comp.graphics
Subject: Re: Request for Human Skeleton
Date: Thu,  5 Nov 92 15:16:51 PDT
Organization: The Portal System (TM)
Distribution: na
  <1992Oct30.141421.16018@bcrka451.bnr.ca>
  <1992Oct30.154733.9234@eng.ufl.edu> <1992Nov1.053029.11099@informix.com>

Years ago I could see a need for chopping up a body to get coordinates
of the body.  But today they have 3-D digitizing for that kind of task.
I know of one outfit in Washington state that can digitize in three
dimensions objects as big as 6'x6'x6'.  

Another thought..why chop up a body when you could make a mold of
the body and chop that up?  
Xref: sparky sci.bio:4122 sci.med:20937 alt.3d:1498 comp.graphics:11839
From: kpm8447@tesla.njit.edu
Newsgroups: sci.bio,sci.med,alt.3d,comp.graphics
Subject: Re: Request for Human Skeleton
Date: 13 Nov 92 03:45:57 GMT
Distribution: na
Organization: New Jersey Institute of Technology

In article <1992Nov11.171207.12452@nmt.edu>, mystical@nmt.edu (Gurupartap Davis) writes:
> article <1992Nov7.200216.25185@spdcc.com> dyer@spdcc.com (Steve Dyer) writes:
> 
>>Not to dwell on the macabre, but the big science museum in Chicago
>>(the one on the lake--I forget its name) has a (very, very, very old)
>>exhibit where a cadaver has been sliced top-to-bottom in something like
>>1/2" slices and encased in lucite or something similar.  These are then
>>mounted on a hinge, so you can "flip thru" them like the pages of a book.
>>
>>This must date from before the 50's.
> 
> I remember seeing that on Ripley's Beleive it ir not several years ago.
> I think they said it was pretty new then.
> 
> Partap Davis
> mystical@jupiter.nmt.edu
> 
> 
> 
> -- 
> ------------------------------------------------------------------------------
> Gurupartap Davis         |I don't have any employers, and if I did, they
> mystical@jupiter.nmt.edu |probably wouldn't care about my opinions.
> ------------------------------------------------------------------------------

I saw the same kind of thing in a museum in Washington, it was from the 
earlyu 20th century or so.  Does anyone have scans (.gifs or wat
whatever) of this sort of thing.  It's great for medical use.
(It's kinda gross too, the pieces were about 1/2" thick!) (the one
I saw was some guy)


-- 

=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
Kirk Membry                              I live in a place that has no sidewalks

kpm8447@tesla.njit.edu                                    kpm8447@teak.njit.edu
kmembry@andromeda.rutgers.edu                             kpm8447@maple.njit.edu
-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
Newsgroups: sci.bio
From: flemyng@hydra.unm.edu (e penryn  flemyngx)
Subject: Bee swarms.questions
Date: Thu, 05 Nov 92 22:51:04 GMT
Organization: University of New Mexico, Albuquerque
Distribution: usa




Newsgroups: sci.bio,sci.med,alt.3d,comp.graphics
From: med50003@nusunix1.nus.sg (WANSAICHEONG KHIN-LIN)
Subject: Re: Request for Human Skeleton
Organization: National University of Singapore
X-Newsreader: TIN [version 1.1 PL6]
Distribution: na
Date: Sun, 8 Nov 1992 14:09:23 GMT

Here's an interesting thought : Visualise the entire human body in 3D by
using virtual reality. Nice concept but who's gonna pay for it?

Seriously though, I think more and more medical schools are using
computer graphics to help with teaching anatomy. I remember a news clip
about Harvard(?) using cadaveric dissection in combination with a table
side computer to show the various structures. I cannot remember if this
was a pilot or test project.

One thing I would point out is that there is a difference between seeing
something and actually feeling and grasping it - try learnning pottery
without any clay at first and then attempt the real thing - not so easy.

Of course, VR should take care of that. I suppose the programmers would
know better.

gervais
Newsgroups: sci.bio
From: 890707p@ace.acadiau.ca (GLENN G. PARSONS)
Subject: Lucke Frog Tumor
Organization: Acadia University
Date: Sun, 8 Nov 1992 17:39:13 GMT

I am looking for anyone who has worked in, or is currently working in this 
area of cancer research. If you are, or have, or know anyone or anyplace 
involved in this type of work, please contact me at this adress(above).
                                      Thanks,

                                       G.Parsons
Xref: sparky sci.bio:4049 sci.med:20600 comp.graphics:11570
From: bvh@cse.unl.edu (Obi-Wan)
Newsgroups: sci.bio,sci.med,comp.graphics
Subject: Re: Request for Human Skeleton
Date: 6 Nov 1992 19:39:01 GMT
Organization: MicroImages, Inc.
Distribution: na
NNTP-Posting-Host: cse.unl.edu

In article <68950@cup.portal.com>, amigan@cup.portal.com (R Michael Medwid) writes:
> Years ago I could see a need for chopping up a body to get coordinates
> of the body.  But today they have 3-D digitizing for that kind of task.
> I know of one outfit in Washington state that can digitize in three
> dimensions objects as big as 6'x6'x6'.  
> 
> Another thought..why chop up a body when you could make a mold of
> the body and chop that up?  

If all you wanted was the outside of the body, what you said would be true.
By slicing up an actual body, you also get 3D models all the internal stuff
in their correct positions.  This makes for a MUCH more complete model than
just the skin.

-- 
 |\_/|  AACK! ||  Genius may have its   ||  "Obi-Wan" (Ben Hollingsworth)
\'o.0'/       ||  limitations, but      ||  MicroImages, Inc.  Lincoln, Nebraska
=(___)=       ||  stupidity is not thus ||  University of Nebraska - Lincoln
   U   PTHAT! ||  handicapped.          ||  email:  bvh@cse.unl.edu
From: petel@sequent.com (Pete Lancashire)
Newsgroups: .kids,sci.psychology
Subject: therapists (Was Re: 20/20 and Spanking from misc.kids)
Date: 9 Nov 92 21:38:25 GMT
Article-I.D.: sequent.1992Nov9.213825.3501
Organization: Sequent Computer Systems, Inc.

>I've tried psychotherapy (for many years, at great expense), as a way
>of coming to terms with my own childhood, and have been utterly
>flabbergasted at how uninterested therapists (still less psychiatrists!)
>are in the *facts* of how one was treated as a child -- given that it is
>common knowledge how significant one's upbringing is for one's adult life.

>Alice Miller, Ronald Laing, and Jeffrey Masson are well-known honourable
>exceptions -- but one is dead (and a somewhat dubious influence anyway),
>and the other two have given up the practice of psychotherapy!

My ex-SO, a Behaviroal Scientist as a Counsellor does not have much to good to
say about the practice. Her method (I can't think of the name right now, but
will get it if anyone is interested) is looked down upon by the US APA et.al.
With kids, one 2 hour visit, two at the most, adults, 4 visits is normal,
does not work in all cases, but from what I have seen is a good start.
Unfortunatly for her not a good way to make a lot money.

For me it has not worked the way I thought it would, but has change my view of
the world. With the boy I'm a mentor to, is is hard to describe. A different
kid came out after two hours, a kid that can now accept the many things wrong
with him is not his fault, able to see a future,  etc., but again, two hours,
can't buy a 'Benz or golf membership on $110 bucks :-)(.  Sorry but the old
FLAME THROWER is lighting up ....

-pete
petel@sequent.com
Xref: sparky sci.psychology:4356 soc.men:19147