jake.com

There is a testing area if all you want to do, is to try out different features -> The Sandbox.

no, i couldn't send an image to my classmate for a project, so i uploaded it here and sent him the link. thanks though.

Can't paste picture into message, so displaying link to get to picture.

Can't paste picture into message, so displaying link to get to picture.

Hey,

I was just wondering what similarities and differences Monotremes, Marsupials,and Placentals had.

 

Thanks

Hermione

I don't know how to phrase this as "help" instead of an "answer." A suggestion would be to look at the way these specific groups give birth. One of them lays eggs, gives live birth to mature children, and lastly one of them gives birth to live, premature young and raises them in a pouch. Similarities? They are all mammals and keep their blood temperature stable within their own bodies.

Post-Abortion Syndrome is more or less recognized by any serious scientist as a made-up attempt to emphasize horrible, destructive consequences of abortion, brought to you by pro-life advocates. Can abortion be stressful? Yes, just about anything can. Can it lead to psychopathological consequences? Yes, just about anything can. Are the supposed symptoms occurring after an abortion ubiquitous enough, severe enough, and internally consistent enough to justify calling it a specific mental illness? The data at this point seem to say no. Recent reviews tend to show that mood distress post-abortion is comparable to or lesser than mood distress postpartum. Abortion's affects on mental health appear to be relatively minimal.

 

That part was just an afterthought; I had to get it in because it got mentioned. I hope nobody decides to pick up on this bit--I can't think of anything more profoundly annoying to argue about than abortion.

I had actually been wondering about this. The hype about it seemed to have some fairly convenient statistics, and fairly vague symptoms. With all of the back and forth over the web, I couldn't make a decision as to whether it was real or not.

I want to compile data on diseases that affect every part of the senses, from where they are first sensed to when they reach the brain, and also to show some special abilities, eg humans can only see red, green and blue but maybe some women can also see the ultraviolet (http://www.post-gazette.com/pg/06256/721190-114.stm : From Wikipedia)and then figure out how to draw some kind of visual aid, like a bell curve, to show it all.

 

Can you show me a link of the different diseases that affect sensory perception. I have to start somewhere, so why not with that.

first one that comes to mind.

http://askville.amazon.com/Neurosyphilis-affect-brain-body/AnswerViewer.do?requestId=15159307

i don't think there is a comprehensive list of diseases that affect sensory perceptions, but i will keep looking.

Since you say "My favorite bacteria can thus continue to eat the milk and spit out waste products" the product would smell of those waste products.

Feel free to invent any you like, but don't pretend it has anything to do with science.

but do to non science "magic," the waste products disappear. So i assume that they aren't factored into the equation.

Hi:

 

I posted something similar in the past. I apologize profusely if anyone is annoyed by what might seem like a repetition of that post. However, if you read carefully, you’ll clearly notice some significant differences.

 

My favorite bacteria are:

 

1. Not gram-negative

2. Free of lipopolysaccharide

3. Non-pathogenic

4. Non-toxic

5. Non-allergenic

 

In terms of respiration, they are any one of the following:

 

1. Facultative-anaerobes [can use oxygen but don't need it]

2. Obligate anaerobes [can only survive in total or near-total absence of oxygen]

3. Aerotolerant-anaerobes [can survive in oxygen but don't use it for respiration or otherwise require it].

 

Let’s say the following Sci-Fi scenario occurs:

 

A sample of fresh, raw, annatto-free, preservative-free, carrageen-free, carrageenan-free, polysorbate-free, purely-natural, disease-free, completely-organic milk of a healthy happy Jersey cow [who grazes solely on natural, organic, healthy, pesticide-free pasture] is gently pumped into a hypothetical container that is eco-friendly, healthy-friendly, oxygen-free, air-tight, vibration-proof and does not let in any light of any wavelength when closed. The tubes connecting the cow’s udder to the container are also light-proof [tubes don’t let in light of any wavelength], eco-friendly, healthy-friendly, oxygen-free, air-tight, and vibration-proof.

 

At no point does any foreign object other than “my favorite bacteria” enter the milk. This is true even when the milk is in the cow’s udder. Even the skin of the cow’s udder is somehow completely free of any foreign substances other than “my favorite bacteria”.

 

In addition, the fat of this milk is magically-protected against any rancidity. In fact all molecules in the milk are completely rancidity-proof.

 

After the milk is pumped into the container, my favorite bacteria decompose this milk as completely as possible. They are able to do so because any lactic acid and carbon dioxide molecules [toxic by-products of metabolism] completely disappear [by magic] just as they are generated.

 

What will be the end product smell like? Remember, this milk is invincible to all forms of degradation except the decomposition and “aging” [or ripening] by my favorite bacteria. Because the lactic acid disappears as it is being produced, the milk does not curdle. My favorite bacteria can thus continue to eat the milk and spit out waste products until the decay is complete. To make matters more interesting, the bacteria are invincible to the otherwise toxic effects of the waste they produce.

 

My guess is that the end product will smell like extremely stale cheese. Am I on the right track?

 

 

Thanks,

 

Green Xenon

well. This is an interesting scenario. I would have to say... that it would smell like the smell of the bacteria. If all the waste is expelled by "magic" as it's produced, and this bacteria decomposes the milk completely, including the proteins and lipids, then that leaves nothing behind except bacteria. Taking your experiment at face value, that should be the answer.

Don't even trying doing anything adventurous dude. Mercury can be very dangerous to your health and can cause lot of damage to your internal organs. It can also be poisonous. As said above you kidney and liver will severely affected by it and this can cause death as well. I don't understand why would anyone want to consume mercury. C'mon you aint gonna become superhero by consuming it.

I read this and imagined someone mainlining mercury in hopes of heightened abilities.

Please explain some interesting disorders in totally non medical terms so that a normal man can understand (as if a doctor was explaining to a patient).

The most common, I would have to say, is PTSD (Post Traumatic Stress Disorder). Symptoms include flashbacks, avoidance of triggers to said flashbacks, inability to feel emotions, detachment, and sometimes suicidal tendencies.

For the most interesting, I would have to say Post-Abortion Syndrome. It involves some of the weirdest symptoms I've ever heard of, and also has a large stigma around it (abortion in general).

I found a picture of a molting emperor penguin although I don't think the molt goes all the way to the skin meaning the colour of the molt coat is not necessarily reflective of the skin

the molting definitely doesn't go all the way through to the skin. Just because of the fact that they live in Antarctica, I would have to say showing bare skin would be a fatal flaw for the penguins.

I've been looking for diseases, problems and differences in each of the above and can't really find any info. Eg: the number of Olfactory_sensory_neurons we have at the lower end and the higher end, and the disease that affect them. But can't really find any info on it. Any suggestions?

I definitely don't have any suggestions. Pretty much out of my league at that point. I know diseases that affect sensory perception, if that's what you're asking?

I've been reading about small animals with nervous systems. I've read that tardigrades can be microscopic while rotifers are close to microscopic. Surely, I need some say in a scale, but I don't have one. Nonetheless, I've been attempting to figure out which organism can be the most miniscule and yet possess a simple nervous system for somatic interaction with its environment.

 

Which can be simpler and smaller: Rotifer or Tardigrade?

I assume you can tell the difference between the two, so i'll just post the picture. From what i can tell, there are close to the same size, but it looks like the rotifers are consistently smaller. Tardigrades win in the cool contest, though. At least in my opinion.

Nice list. To answer your question, thirst and hunger are not outside stimuli producing sensory reactions, so they are not technically senses.

Well, in a natural selection sense, yes. By introducing a species into an environment only some of its population is suited to, you can speed up the evolution process in favor of the suited phenotype. This is called directional selection, or the gradual shift of a population into a suitable phenotype based on the entire groups genotype.

I cast my vote for this thread as being the best thread ever.

Hey guys,

I've just received my first bio assignment of year 12. It's an EEI and the task is to write a formal scientific report based on experimental studies conducted by you on a topic of your choice. Taking into account that the chosen topic is limited to one that can be analysed and re analysed within the time boundary and within the budget constraints. There are also strict guidelines regarding the use of vertebrate animals for research and the conditions under which tests can be conducted on invertebrates and bacteria.

I've thought of some possibilities, but im not really sure which would be the best. Here are some of my ideas:

• The effect of auxins + gibberellic acid on growth and development of tomatoes.
  
• Effect of food smells on insect attraction
  
• Micro and macro nutrients effect on plants
  
• Respiration rates in plants subjected to various conditions
  
• Overcoming seed dormancy in plants (eg, seeds that require bush fires to open...)
  

Any suggestions or help would be appreciated heaps

Tyler

the first one is the easiest to perform and replicate, so i would definitely choose that one.

That's amazingly helpful, and the best, most informative post I've ever read on this forum. Thanks for elaborating, it's all noted down.

btw, humans apparently do not have a fast block mechanism.

Its in chap 46 of my AP Bio book. It has two parts, the fast block and the slow block. The fast block is at the end of the acrosomal reaction, when the sperm fuses with the egg's cytoplasm. this causes the ion channels to open up and release sodium ions to flow into the egg and change the membrane potential. This change is called depolarization, and it occurs within 1-3 seconds after the sperm fuses with the egg.

The second part is called the cortical reaction. since the depolarization only lasts a few minutes, it only blocks sperm for a short time. Numerous vesicles lie just beneath the egg's plasma membrane, in the rim of the cytoplasm called the cortex. within seconds of the fusion, these vesicles, called cortical granules, fuse with the egg plasma membrane, initiation the cortical reaction. cortical granules contain a treasure trove of molecules, which are now secreted into the perivitelline space, which lies in between the plasma membrane and the vitelline layer. the secreted enezymes and other macromolecules together push the vitelline layer away from the egg and harden the layer, forming a protective fertilization envelope that resists the entry of additional sperm. another enezyme is released which clip the remaining sperm receptor proteins.

whew. now you know, lol.

my teacher showed a way of doing this, using rounding

2+2=5

2.4+2.4= 4.8

round it up and down

2+2=5

2.4 is rounded down to 2 and 4.8 is rounded up to 5.

Merry Christmas or Happy Holidays all

No, I'm not.

never mind then, lol

I didn't think there was.

I'm reading about cytoplasmic inheritance again and endosymbiosis.

I could be wrong.

Are you in AP Biology? Thats the chapter we just finished.

Yes, well done.

Of course, I'm a fool.

 

I should have stated that I'm trying to find an image a mitochondrion in a mother's gamete, such as an ovum. There is such a thing, right?

 

* note: original post has been edited to say "ovum" instead of "gamete."

From what i can tell, i don't think there are any mitochodria in the ovum cell itself.

http://www.merriam-webster.com/art/med/ovum.htm

You can't reason with unreasonable people. Thus, they are "unreasonable".

So, I agree with Cap'n. Eventually, they will probably get so frustrated with your arguement strategy that they will stomp off in a huff of desperation. Which basically means that you've won.

It's not about winning. It's about changing opinions:cool:

If you bother about other people reading the debate: Just imagine that those people are intellectually capable of forming their own opinion, irrespective of who had the last word.

its easier to change someones opinion if they know the subject matter. Arguing with an ignorant person is frusterating, since they don't know enough about the subject to form a legitimate arguement.