HDTenEightyP/NetNews huggingface dataset:
From: daryl@RT2.MENZIES.SU.EDU.AU (Daryl Webb)
Newsgroups: bionet.population-bio
Subject: Ashmoles Hypothesis
Date: 8 Apr 92 04:34:37 GMT
Distribution: bionet


I'm in the process of writing a short evaluation of Ashmole's Clutch size
Hypothesis as part of my studies.  I also need to examine the validity of
Lack's earlier work as a component of this.

I would be interested in receiving any comments pertaining to this field.

Thanks
--
                                                     |      |
  Daryl Webb  (daryl@menzies.su.edu.au)               \    /
  Menzies School of Health Research                    \__/
  P.O. Box 41096                                        ||   <<
  Casuarina N.T. 0811            ----------------------- *  <<
  Australia                                             ||   <<
  Voice : 61_89_228196                                 /||\
  Fax   : 61_89_275187                                * || o
                                                     /  ||  \
From: CFARMER1@UA1VM.BITNET (Chet Farmer, Asst. Dir., Project IDEALS)
Newsgroups: bionet.announce
Subject: ANNOUNCEMENT OF SAGSET CONF
Date: 9 Apr 92 22:28:50 GMT



  * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
* *                                                                 * *
*     ----------------------                                          *
*     Call for participation:  ---------------------                  *
*     ----------------------   Joint 1992 conference:  ///////////    *
*                              ---------------------   S A G S E T    *
*                                                       I S A G A     *
*   Society for the Advancement of Games and           \\\\\\\\\\\    *
*   Simulations in Education and Training                             *
*                   International Simulation and Gaming Association   *
*                                                                     *
*   Conference theme:        Developing transferable skills through   *
*   ----------------                          simulation and gaming   *
*                                                                     *
*   18-21 August, 1992       Napier University, Edinburgh, Scotland   *
*                                                                     *
*   For further information:                          Fred Percival   *
*   =======================       SAGSET/ISAGA Conference Secretary   *
*                                                 Napier University   *
*                                                 219 Colinton Road   *
*   Telephone:  44 / 31-455-4394                 Edinburgh EH14 1DJ   *
*   Facsimile:  44 / 31-455-7989                           Scotland   *
*                                                                     *
* *                                                                 * *
  * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *

+-----------------------------------------------------------------------+
|  Chet Farmer, Assistant Director   |   English / 103 Morgan           |
|  Project IDEALS -- FIPSE, DoE      |   Tuscaloosa, AL  35487-0244     |
|  University of Alabama             |   tel 205-348-9494               |
+-----------------------------------------------------------------------+
From: kristoff@genbank.bio.net (Dave Kristofferson)
Newsgroups: bionet.announce
Subject: CALL FOR DISCUSSION: bionet.biology.used-equipment
Date: 9 Apr 92 20:10:57 GMT


We have had a couple of suggestions recently for a newsgroup where
people can post ads to sell used equipment and other lab items (this
would be for used items only, not for commercial postings).

Here is the charter for such a newsgroup:

----------------------------------------------------------------------
bionet.biology.used-equipment would be devoted to posting notices of
used laboratory equipment or other lab items that are for resale by
the owner.  The newsgroup may not be used by commercial concerns
seeking to promote products, nor may it be used by individuals as
advertising for "pawn shop" purposes, i.e., network regulations would
not permit an "entrepreneur" from buying and reselling used equipment
through the use of this medium.  Questions about the use of equipment
or equipment preferences would *not* be within the charter of this
newsgroup, but should be submitted to the
METHODS/bionet.molbio.methds-reagnts newsgroup.  The newsgroup is open
(not moderated).
----------------------------------------------------------------------

As this falls into the service category, we do not need a discussion
leader for such a newsgroup.

Discussion will now open for ten days on BIOFORUM/bionet.general.
PLEASE do not post one-line messages saying only "I am in favor of
such a newsgroup".  We will collect votes later.  The discussion
period is an opportunity for anyone to bring up reservations about the
proposed charter and to propose modifications prior to the vote.

One issue which might be addressed is whether people feel comfortable
posting such items to the current METHODS newsgroup versus creating a
new newsgroup solely for the purpose above.  To date there have not
been a lot of used equipment postings on any of the newsgroups.  If
discussion indicates that this is a superfluous addition to
BIOSCI/bionet I might withdraw this proposal.

				Sincerely,

				Dave Kristofferson
				GenBank Manager

				kristoff@genbank.bio.net
From: reilly@staff.dccs.upenn.edu (G. Brendan Reilly)
Newsgroups: bionet.announce
Subject: Recombinant DNA methodology course offered at MBL
Date: 10 Apr 92 16:45:45 GMT
Organization: University of Pennsylvania/Marine Biological Laboratory


The Marine Biological Laboratory and Exon-Intron, Inc.
are offering two one-week workshops on Recombinant DNA
methodology at the MBL for 20 students each.

The first workshop (June 29-July 3, 1992) will be a
basic course consisting of lecture and extensive
hands-on laboratory exercises covering: isolation of
plasmids, isolation of genomic DNA, bacterial
transformation, restriction enzyme digestion, agarose
gel electrophoresis, isolation of cytoplasmic RNA,
Southern transfer, synthesis of nucleic acid probes,
purification of poly(A) RNA, and dot blot analysis.

The second workshop (July 6 - July 10, 1992) will cover
more advanced topics including: cloning, cellular RNA
isolation, nucleic acid probe synthesis, Northern
transfer, Southern transfer, and the polymerase chain
reaction (PCR).

Fees - $950 for each workshop, includes room and board.
Request application forms from:

    Dori Chrysler, Marine Biological Laboratory, 
    Woods Hole, MA 02543  USA
    (508) 548-3705 ext. 216
    fax (508) 457-1924
    email - LGarrick@mbl.edu.

Application deadline is May 4, 1992.
From: ARWF01@PLUMCS11.BITNET (Piotr Wlaz)
Newsgroups: bionet.neuroscience
Subject: (none)
Date: 14 Apr 92 14:33:08 GMT
Article-I.D.: genbank.9204141342.AA04458
Distribution: bionet


I would like to evaluate phosphodiesterase activity in whole mouse brain. Could
 anybody point me some references dealing with rather simple methods on the top
ic I am interested in?
Thanks in advance,

Piotr Wlaz
Dept. Pharmacol.
Vet. Fac.
Lublin, Poland
e-mail: arwf01 at plumcs11.bitnet
From: smgxt01@ucl.ac.uk (Dr Thomas Salt)
Newsgroups: bionet.neuroscience
Subject: Re: Repolarization Time of Neuron
Date: 16 Apr 92 07:10:46 GMT
Organization: Bloomsbury Computing Consortium

allens@yang.earlham.edu (Allen Smith) writes:


>        There seems to be a contradiction in the definitions of refractory
>period and repolarization time. What's the name for how long it takes
>before a neuron can send a signal again? On what does it primarily depend
>(myelinated/non-mylelinated, or what)?

>        -Allen

There is no contradiction.  The two are just not the same thing.  My
text book definintion of 'refractory period' comes from Kuffler &
Nicholls (paraphrase): The refractory period is a 
period of enforced silence during
which a second impulse (action potential cannot be initiated).

This is different from (and almost always longer than) the
repolarisation time, which is usually less than a millisecond, whereas
the refractorey period can be tens of ms long.  These two times depend
on the nature of the ion channels in individual neurones, and on the
membrane capacitance.

	Tom Salt.
From: POSTMASTER@IRLEARN.BITNET ("Undetermined origin c/o Postmaster")
Newsgroups: bionet.neuroscience
Subject: (none)
Date: 8 Apr 92 22:35:21 GMT
Distribution: bionet


Hello Fello Neur-sci'lers,

          I have a student who is interested in electrical
      stimulation in children.  Specifically, she is interested
      in any information about electrical stimulation to
      decrease spasticity in children with spastic diplegia as
      a result of cerebral palsy.
          I would appreciate any leads which you could provide.
      I've heard of spinal cord stimulation being done to
      help with spasticity in adults but am not aware of any
      work on children.
                          Regards,

                                   Clayton D. Gable, PT, Ph.D.
                                   University of Central Arkansas
                                   Department of Physical Therapy
                                   Conway, AR 72035        USA
From: kepler@SANTAFE.EDU (Thomas Kepler)
Newsgroups: bionet.neuroscience
Subject: why 2 brains?
Date: 7 Apr 92 16:53:49 GMT
Article-I.D.: sfi.9204071653.AA04648
Distribution: bionet

A machine-learning researcher here asked me why the cerebral cortex is
divided into two halves, with relatively little communication between them.
He was concerned that maybe there is a *reason* for having this arrangement,
and wanted to know what it might be.  I mumbled something about early develop-
ment and the corpus callosum being a fairly hefty channel after all,
but I'm not comfortable with those responses.  If there is anyone out there who can shed some light on this issue, it would be greatly appreciated.  
	Please respond personally, since we don't have a usenet news here.

	Thank you,

	Tom Kepler
Newsgroups: bionet.neuroscience
From: rdm1@quads.uchicago.edu (Uncl Rusfuk)
Subject: Re: more references about oscillations
Reply-To: rdm1@midway.uchicago.edu
Organization: Vandy Dept. of Vision and fun.
Distribution: usa
Date: Sun, 12 Apr 1992 18:22:20 GMT

One of the important things to keep in mind about these oscillations, and one
of the reasons it's so big, is that it was predicted by modellers _before_
being discovered in kitties.

von Der Marlsburg and Schneider (1986, Biol. Cybernetics, 54, 29-40, "A Neural
Cocktail-Party Processor.")  wrote about a hypothesized solution to the 
"binding" problem.  This, or other, von Der Marlsburg is important to 
understanding the excitement behind these oscillations.

Frankly, I find the whole thing a bit hokey, but then "the binding problem" is 
not an unambiguous task for vision (or perception in general).

Later, 

Russ  (MASTRD@ctrvax.Vanderbilt.edu)
From: gt3228c@prism.gatech.EDU (gt3228c Edwin R. Yeh)
Newsgroups: bionet.neuroscience
Subject: < Repolarization Time of Neuron >
Date: 6 Apr 92 21:48:41 GMT
Organization: Georgia Institute of Technology

---------------------------------------------------------
What is the repolarization time of a neuron in the brain?

Repolarization time is defined here as the time 
AFTER firing of the neuron and BEFORE the neuron is
ready to fire AGAIN.

My guess is "it depends." But even then can you give
me an "average" or a "range" of values. I haven't been
able to find out any statistics on these yet. But I am
sure, I must have overlooked my resources. Any
idea will be appreciated. Our group is trying to model
a realistic brain. For now, we are just hoping to use 
this time as a constant in our program. But obviously,
we may need to learn more about this. Thanks.

Edwin R. Yeh
Projedt Leader, Brain Monitor Group
UROP - Biomedical Engineering 
---        
"A great man never loses his innate curiosity." --- Mong Zi
Edwin R. Yeh (@ Georgia Tech)      |Internet:gt3228c@prism.gatech.edu
Computer Engineering/Neuroscience  |Phone   :404-676-9132
From: CLAYTONG@VM1.UCA.EDU ("Clayton D. Gable, PT, Ph.D.")
Newsgroups: bionet.neuroscience
Subject: Electrical stimulation for spasticity.
Date: 8 Apr 92 13:08:28 GMT
Article-I.D.: genbank.9204081429.AA27283
Distribution: bionet


Hello Fello Neur-sci'lers,

          I have a student who is interested in electrical
      stimulation in children.  Specifically, she is interested
      in any information about electrical stimulation to
      decrease spasticity in children with spastic diplegia as
      a result of cerebral palsy.
          I would appreciate any leads which you could provide.
      I've heard of spinal cord stimulation being done to
      help with spasticity in adults but am not aware of any
      work on children.
                          Regards,

                                   Clayton D. Gable, PT, Ph.D.
                                   University of Central Arkansas
                                   Department of Physical Therapy
                                   Conway, AR 72035        USA
From: pedro@mulab.physiol.upenn.edu (maldonado)
Newsgroups: bionet.neuroscience
Subject: more references about oscillations
Date: 6 Apr 92 15:47:17 GMT
Distribution: usa
Organization: University of Pennsylvania

Hi!
	Here is a number of references about oscillations and the
binding problem, taken from Medline. Paul`s posting was very precise
about the current state of the problem.

AN  91333762.  9110.
AU  Buzsaki G
IN  Department of Neurosciences, University of California at San
    Diego, La Jolla 92093.
TI  The thalamic clock: emergent network properties.
SO  Neuroscience.  1991; 41(2-3): pp351-64.

AN  91126101.  9105.
AU  Llinas RR;  Grace AA;  Yarom Y
IN  Department of Physiology and Biophysics, New York University
    Medical Center, NY 10016.
TI  In vitro neurons in mammalian cortical layer 4 exhibit intrinsic
    oscillatory activity in the 10- to 50-Hz frequency range.

AN  90127306.  9103.
AU  Buzsaki G;  Gage FH
IN  Department of Neurosciences, University of California at San
    Diego, La Jolla 92093.
TI  The cholinergic nucleus basalis: a key structure in neocortical
    arousal.  
SO  Experientia Suppl.  1989; 57(): pp159-71.

AN  90044070.  9103.
AU  Alonso A;  Llinas RR
IN  Department of Physiology and Biophysics, New York University
    Medical Center, New York 10016.
TI  Subthreshold Na+-dependent theta-like rhythmicity in stellate
    cells of entorhinal cortex layer II.
SO  Nature.  1989 Nov 9; 342(6246): pp175-7.

AU  Stryker MP
TI  Cortical physiology. Is grandmother an oscillation ? (news)
SO  Nature.  1989 Mar 23; 338(6213): pp297-8.

AN 89159429.  9103.
AU Gray CM;  Konig P;  Engel AK;  Singer W
TI Oscillatory responses in cat visual cortex exhibit inter-columnar
   synchronization which reflects global stimulus properties.
SO Nature.  1989 Mar 23; 338(6213): pp334-7.

AN  92021005.  9202.
AU  Engel AK;  K onig P;  Singer W 
IN  Max-Planck-Institut f ur Hirnforschung, Frankfurt, Federal
    Republic of Germany.
TI  Direct physiological evidence for scene segmentation by
    temporal coding.  
SO  Proc Natl Acad Sci U S A.  1991 Oct 15; 88(20): pp9136-40.


AN  89159429.  9103.
AU  Gray CM;  Konig P;  Engel AK;  Singer W 
IN  Max-Planck-Institute for Brain Research, Frankfurt am
    Main, FRG.
TI  Oscillatory responses in cat visual cortex exhibit
    inter-columnar synchronization which reflects global stimulus properties.
SO  Nature.  1989 Mar 23; 338(6213): pp334-7.
From: FTAMB@ALASKA.BITNET ("ANITA M BUSH")
Newsgroups: bionet.neuroscience
Subject: (none)
Date: 7 Apr 92 03:01:35 GMT
Distribution: bionet

Subject: repolarization (absolute refractory) time of a neuron
Shall we add other "it depends" factors, such as:
brain temperature, chemically variable environment (e.g. pH, pO2),
presence of membrane stabilizing agents (e.g. steroids & lazeroids),
various "cable propertieis" of the neuron itself (e.g. diameter, length,
condition of the insulation) etc....?
Anita Bush
Dept. of Behavioral Sciences
University of Alaska Fairbanks
FTAMB@Alaska
From: u1795@JSP.UMontreal.CA (Zimmer Eric)
Newsgroups: bionet.neuroscience
Subject: Enquiring about perception, memory & nervous impulses
Keywords: impulses, memory, perception
Date: 8 Apr 92 02:51:22 GMT
Organization: A Secret one.


 
Out of curiosity...
 
 
  What are the courses taken by nervous impulses,
  from the senses up to the higher area of the
  brain?
 
  Do they inevitably the perceptual areas
  _before_ going anywhere or can they bypass
  the perceptual areas to access directly the rest
  of the cortex?
 
  Tell me if I am being silly. 
 
  I am trying to figure out(without any neurobio-
  logical knowledge whatsoever -- almost) what
  are the differences(& links) between perception,
  memory and, er... , "conciousness".
 
 
  If you can suggest me any book on the subject
  (one that can be understood by someone who took
  some biology courses years ago but doesn't 
  remember too well the technical bits), I'dd
  be gratfull.  I'dd also be thankfull to anyone
  who has the time to answer me back.
 
 
  (I'dd prefer you'dd reply to mortel@chose.cam.org
   if you can and happened to catch a glimpse of this note)
  
 
 -"What if... What if there could be something       | Stephane Lussier
   BIGGER than space and time, BIGGER than, than..." |
 -"Oh! shut up and tell me what's on channel 10."    | mortel@chose.cam.org
From: mbieda@PSYCH.STANFORD.EDU (Mark Bieda)
Newsgroups: bionet.neuroscience
Subject: repolarization time
Date: 16 Apr 92 20:07:36 GMT
Distribution: bionet


Tom Salt has it right - the original definition of repolarization time
offered over the net by Yeh was simply incorrect.

Mark Bieda
From: skspoidn@susssys1.rdg.ac.uk (Mike Poidinger)
Newsgroups: bionet.neuroscience
Subject: Re:  Enquiring about perception, memory & nervous impulses
Date: 8 Apr 92 11:41:07 GMT
Article-I.D.: subnode.8948.9204081141
Distribution: bionet

Stephane,
I am a microbiologist with (also) virtually no neurobioilogical knowledge,
 however:

I saw a TV programme on the senses once (in Australia several years ago) which
showed a number of interesting things about sensory links- among them was a man
who was blind due to neurological dosorder (eyes worked fine). He could not
 point to a light spot on a wall when it was held steady at certain points, or
 moved around, but could point to it when it was flashed at those points, even
 though he could no


Mike Poidinger
Dept of Microbiology
University of Reading
From: mbieda@ARAGORN.STANFORD.EDU (Mark Bieda)
Newsgroups: bionet.neuroscience
Subject: re:repolarization time of neuron
Date: 6 Apr 92 22:28:42 GMT
Distribution: bionet


1) You are really asking about the "refractory period", which is quite distinct from the "repolarization time". The absolute refractory period, which is the time after an action potential that a neuron is absolutely unable to fire another
action potential, has a textbook value of 1 msec. Now, this masks a great range`of firing frequencies - 1 kHz is usually considered an absolute upper bound, with 800 Hz or so the highest I've seen in print. (Any counterexamples out there?)

2) Your definition does not accord with the neuronal reality of repolarization.
In short, a neuron need not repolarize to fire another action potential (e.g.
thousands of examples of plateau potentials with burst firing, in both
vertebrate and invertebrate systems). 

3) Assuming that you are making neocortical mammalian models, you might
want to look at work from the laboratory of John Connors, among others. There
was a relatively recent TINS review on this subject.

4) If only we could model a single neuron realistically....

Mark Bieda
Stanford Neuroscience Program
email:mbieda@psych.stanford.edu
From: smgxt01@ucl.ac.uk (Dr Thomas Salt)
Newsgroups: bionet.neuroscience
Subject: Re: < Repolarization Time of Neuron >
Date: 7 Apr 92 12:24:43 GMT
Organization: Bloomsbury Computing Consortium

gt3228c@prism.gatech.EDU (gt3228c Edwin R. Yeh) writes:

>---------------------------------------------------------
>What is the repolarization time of a neuron in the brain?

>Repolarization time is defined here as the time 
>AFTER firing of the neuron and BEFORE the neuron is
>ready to fire AGAIN.

Strictly speaking, repolarisation time is the time it takes for the
membrane potential to return to rest from the peak of the depolarising
phase of the action potential.  This is generally less than 1ms in
normal neurones.  Following repolarisation, there is a period called
the refractory period during which it is impossible/difficult to evoke
subsequent action potentials.  The length of this period is very
variable from neuron type to neuron type and can be hundred of ms
long, or only a few tens...  'it depends'.

Tom Salt - T.Salt@ucl.ac.uk
From: wetzel@bu-bio.bu.edu (Randy Wetzel)
Newsgroups: bionet.neuroscience
Subject: measurement of intraocular pressure
Date: 16 Apr 92 19:55:19 GMT
Reply-To: wetzel@bu-bio.UUCP (Randy Wetzel)
Distribution: bionet.neuroscience
Organization: /usr/lib/news/rn/organization

Does anyone out there know of an inexpensive way to measure intraocular
pressure?  (I am working with small turtles)  It is not necessary for me
to know the exact pressure (mm Hg) - I just want to be able to monitor 
any changes that occur during the experiment.

Thank you in advance

Randy Wetzel
Boston University
From: allens@yang.earlham.edu (Allen Smith)
Newsgroups: bionet.neuroscience
Subject: Re: Repolarization Time of Neuron
Date: 12 Apr 92 22:22:21 EST
Organization: Earlham College, Richmond, Indiana

From: mbieda@ARAGORN.STANFORD.EDU (Mark Bieda)

>1) You are really asking about the "refractory period", which is quite distinct
>from the "repolarization time". The absolute refractory period, which is the
>time after an action potential that a neuron is absolutely unable to fire
>another action potential, has a textbook value of 1 msec. Now, this masks a
>great range`of firing frequencies - 1 kHz is usually considered an absolute
>upper bound, with 800 Hz or so the highest I've seen in print. (Any
>counterexamples out there?)
>2) Your definition does not accord with the neuronal reality of repolarization.
>In short, a neuron need not repolarize to fire another action potential (e.g.
>thousands of examples of plateau potentials with burst firing, in both
>vertebrate and invertebrate systems).
>3) Assuming that you are making neocortical mammalian models, you might
>want to look at work from the laboratory of John Connors, among others. There
>was a relatively recent TINS review on this subject.
>4) If only we could model a single neuron realistically....

From: smgxt01@ucl.ac.uk (Dr Thomas Salt)

>>What is the repolarization time of a neuron in the brain?
>>Repolarization time is defined here as the time
>>AFTER firing of the neuron and BEFORE the neuron is
>>ready to fire AGAIN.

>Strictly speaking, repolarisation time is the time it takes for the
>membrane potential to return to rest from the peak of the depolarising
>phase of the action potential.  This is generally less than 1ms in
>normal neurones.  Following repolarisation, there is a period called
>the refractory period during which it is impossible/difficult to evoke
>subsequent action potentials.  The length of this period is very
>variable from neuron type to neuron type and can be hundred of ms
>long, or only a few tens...  'it depends'.

        There seems to be a contradiction in the definitions of refractory
period and repolarization time. What's the name for how long it takes
before a neuron can send a signal again? On what does it primarily depend
(myelinated/non-mylelinated, or what)?

        -Allen