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Mental Disorders.

Posted by Mary Altamuro in Science and Society - Best on Saturday, November 13, 2010 at 6:51 pm

Mary Altamuro

 

When we think of the mentally handicapped or those with mental disorders, we instantly feel pity.  We usually do not stop to wonder why or how a person came to be stricken with the disability or disorder that afflicts them.   I find myself curious about why these disorders still exist generation after generation even after all the scientific effort at uncovering the causes and possible cures.  A great deal of time and attention has been spent on how these disorders came to exist and what might make them worse and how to make them better, but there is still so much we still need to learn.  Thankfully, scientists have given us a great deal of information that can be very beneficial in understanding, treating and hopefully someday curing or preventing mental and emotional issues. 

Recently, studies have shown that a genetic predisposition may be hidden in people that makes them prone to certain characteristics that when provoked, can create emotional or mental conditions.  This predisposition, in conjunction with a triggering event or simply by the quality in that person’s environment and upbringing can cause these characteristics to become problematic and spark a mental or emotional abnormality. This peculiar phenomenon is called the diathesis-stress model.

According to this theory, when provoked, a characteristic may go into overdrive, causing a person to have a legitimately diagnosable illness. Environmental stimuli that may cause such a thing to happen are social issues or trauma that may have occurred at a young age.

 One of the most common problems that can cause such a change in people would have to do with their parents. If a young person does not receive the right kind of attention as they are maturing, it can cause emotional and social problems for them later in life.  An overbearing or judgmental parental figure can cause a person to have low self-esteem, which could then inflict disorders such as narcissistic personality disorder, social anxiety disorder or even depression.   Parents who get divorced have also been shown to cause obsessive-compulsive disorder in as children of divorced parents tend to feel they have a loss of control in their lives and obsessive-compulsive disorder is a disorder driven by a person’s overwhelming need and drive for control. 

These disorders reveal themselves when people who are predisposed for the characteristics are triggered by an emotional or social stress. This ignites an inner need to balance themselves out, mentally. Sadly, they often emotionally overcompensate; leaving them worse off then they were in the beginning.





Sources:

The Cleveland Clinic Foundation, Initials. (2005, May 20). Narcissistic personality disorder. Retrieved from http://my.clevelandclinic.org/disorders/personality_disorders/hic_narcissistic_personality_disorder.aspx


Elana Pearl Ben-Joseph, MD, Initials. (2008, November). What causes ocd?. Retrieved from http://kidshealth.org/teen/your_mind/mental_health/ocd.html#


Amal Chakraburtty, MD, Initials. (2010, March 01). Causes of depression. Retrieved from http://www.webmd.com/depression/guide/causes-depression


Rashmi Nemade, Ph.D., Natalie Staats Reiss, Ph.D., and Mark Dombeck, Ph.D., Initials. (2007, September 19). Current understandings of major depression - diathesis-stress model. Retrieved from http://www.mentalhelp.net/poc/view_doc.php?type=doc&id=12998&cn=5


Cadena, Christine. (2007, November 16). How anxiety develops in children: the "diathesis-stress" model. Retrieved from http://www.associatedcontent.com/article/446920/how_anxiety_develops_in_children_the.html
Tags: scisocY, Best, evolution
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Evolution; Endangered Species

Posted by Ashley Melendez in Science and Society - Best on Friday, November 12, 2010 at 11:54 am

Evolution, evolution is a very touchy subject. It is also a very debatable subject in regards to many different things and the way that they’re taken. But it is something that I personally find very interesting. There’s something that I question actually and it’s not exactly on topic of evolution but instead of an occurrence, extinction. We all know that extinction is the dying off of something, but specifically in this case species. So my question is, if extinction is so posed to be a natural part of life on Earth, why should we care about protecting endangered species?


extinction-risk

This pie chart here is a proportion of all assessed species in different threat categories of extinction risk on the IUCN Red List, based on data from 47,677 species. Source: IUCN, pie chart compiled by Secretariat of the Convention on Biological Diversity (2010) Global Biodiversity Outlook 3, May 2010.




extinction-risk-by-species




This visualization here are the threat statuses of comprehensively assessed species by IUCN. Source: IUCN, compiled by Secretariat of the Convention on Biological Diversity (2010) Global Biodiversity Outlook 3, May 2010.


Endangered species are species in which are dying off due to natural or some other source of endangerment to their habitat. A very good point is that trying to save each and every endangered species is something that is practically impossible. Things we do everyday kill our world and animals habitats in a way and these aren’t things that can just change, their things that take time. But against that you can say that we are doing things to try and help like helping clean, recycling, coming up with different gases, and solar energy. A question for your thought on this though is, is it all worth it?

Personally i am a big believer that it is worth saving endangered species but not all them individually. I feel that an ideal strategy would be to focus on putting limits for human impact to entire ecosystems instead of protecting individual species based on some chances that they have of recovery over others. Chris Packman a TV naturalist did hit a good point in an article i read on extinction. He say's, "Extinction is very much a part of life on earth. And we are going to have to get used to it in the next few years because climate change is going to result in all sorts of disappearances." This was said in an article about saving Pandas (pandas in which are part of an endangered species) to where he is on the side of yes and is for saving them. But in that same article chief scientist at World Wide Fund for Nature says no, and because he feels that to much has already gone to them and not the purpose of habitat.  

I guess the answer to my question ultimately comes down to personal belief and opinion towards the subject. Although something that can be taken from this is that human-induced warming is already rapid and is expected to further accelerate. We as humans are not only harming habitats by doing stuff we have become accustomed to but also hurting ourselves with endangering our environment. 

A great video on this is:

http://www.youtube.com/watch?v=FS0gpU6P-6M

Sources:
1) http://www.guardian.co.uk/environment/2009/sep/23/panda-extinction-chris-packham
2) http://www.createdebate.com/user/viewprofile/PungSviti
3) http://www.globalissues.org/article/171/loss-of-biodiversity-and-extinctions
4) http://www.skepticalscience.com/Can-animals-and-plants-adapt-to-global-warming.html

Tags: Ashley Melendez, 2010, Science Leadership Academy, scisocY, Endangered Species, evolution
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Are humans Still evolving?

Posted by Justin Genelli in Science and Society - Best on Friday, November 12, 2010 at 10:40 am


evolution

Humans are still evolving. It has been argued that the way that society is set up means that virtually everyone will reproduce, ruling out the selection pressures which were once driving us to evolve. Though in truth, we're evolving faster then ever, Or as Dr. John Hawks said, "The widespread assumption that human evolution has slowed down because it's easier to live and we've conquered nature is absolutely not true. We didn't conquer nature, we changed it in ways that created new selection pressures on us."

A study, led by Dr. John Hawks, has found that humans are evolving up to 100 times faster in the last 5000 years then they have been since we split with the ancestors of Chimps. The study has also found that humans are becoming more genetically diverse, depend on what part of the world they live in. such as the gene for lighter skin in northern Europe, or the African population becoming resistant to Malaria. Or how a majority of the Chinese and African population cannot digest lactose in milk, but a majority of Europeans have a lactose-tolerance gene. One reason could be that in northern Europe there is less sunlight and its lower in intensity, so people make less vitamin D in their skin. Vitamin D is critical for absorbing calcium, so people in Europe needed to be able to digest lactose to increase the amount of Vitamin D they have.



evolution
evolution
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Humans are still evolving? Whaaat!

Posted by Jeremy Cothran in Science and Society - Best on Friday, November 12, 2010 at 10:06 am

Click Awesome link Here

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Are Humans Still Evolving?

Posted by Devon Thomas in Science and Society - Best on Friday, November 12, 2010 at 9:05 am

300_179975
300_179975
​ Studies show that the human race is still evolving. Children are becoming shorter and heavier with lower blood pressure and cholesterol levels. Women generally have their first child at a younger age. According to TIMES magazine women who are stout and heavier have more children because they ovulate more regularly. This agrees with why children are shorter and heavier.

ScienceDaily completed a long-term experiment that explains all of these traits. They did a study of the same people and their children over the course of 60 years.  Their conclusions showed that humans are still evolving, and children are becoming shorter and heavier.


Humans are still evolving, but how fast are things changing? “The changes may be slow and gradual, but the predicted rates of change are no different from those observed elsewhere in nature, the researchers say.”  Humans aren’t going to be extinct anytime soon, but we will be eventually. The more technology we have, the less we rely on natural selection.


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Evolution of Intelligence

Posted by Zachary Walls in Science and Society - Best on Friday, November 12, 2010 at 8:55 am

​Why does a species evolve to speak? What causes something evolves to the point where it can think, “hey this fruit is too high maybe I can use these rocks to get it down”.  Like with many things a credible theory for why would be evolution. If we look on our branch we will find Chimpanzees.  Chimpanzees evolved from a common ancestor and for all purposes are our sister species.  Like humans there is more to what they do then eating and mating. They have figured out how to communicate with each other, they work together to accomplish goals. They can stop and analyze a situation rather then just jumping in. they make use of tools in their surroundings to help them complete their goals. They care what other members of their species think about and fall into ranks under who has the most food or best ability to get food. And they are quite capable of using deception to gain the advantage over other members of their species. At the moment it is unknown exactly what caused us to develop the way we did and what caused our relatives to evolve the way we did. But what this does show is that intelligence is a evolutionary trait and not something we just have. It shows that something must have gone right in our branch’s past to allow us to be how we are today.

apes-and-humans-tree



http://www.indiana.edu/~origins/teach/A105/lectures/A105L12.html



picture provided from: Richard E. Leakey, The Making of Mankind, Michael Joseph Limited

found at http://www.answersingenesis.org/articles/ee/origin-of-humans 
Tags: evolution, Best, scisocY
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I Now Pronounce You Chimp & Larry

Posted by Davonte Martin in Science and Society - Best on Friday, November 12, 2010 at 2:02 am

Screen shot 2010-11-12 at 2.14.47 AM
Screen shot 2010-11-12 at 2.14.47 AM
Image By:Da Vonte Martin

Scientific evidence has merely proven that humans share a common ancestor with Apes. Yes, that means we have some of the same DNA in fact DNA evidence proves that we share more than 98% of the same DNA.Though we share the same DNA there is an "unknown" ancestor whom takes the credit for connecting the human and ape species.With that being said most people would think that humans are able to mate with apes because the common DNA links them as the "same" species. Humans and apes share some of the same physical features like:

  • Walking up right

  • Thumbs

  • Ability to grasp with all five fingers

  • Similar skull structure

  • Round Ears

Sadly, humans can not reproduce with the monkey specie because that other 2% which makes the ape and human race are the chromosomes. Monkey's have
48 (24 pairs) chromosomes whereas the human body makes up of 46 (23 pairs). In order for any species to reproduce, both subjects need to have their 23 pairs of chromosomes because every chromosome carries DNA which corresponds to the opposite sex which enables them to have children.Though humans and monkeys cannot reproduce now , that doesn't mean that they have then. According to well-known Science Correspondent Richard Ingham, "The youngest chromosome in the human genome is the X, which helps determine gender. On average, X is around 1.2 million years more recent than the 22 non-sex chromosomes, the scientists found.". This means that the X-Chromosome in humans and apes are as recent as the first recorded humans only about seven-million years ago. So not only did humans and apes have sexual intercourse , but they were able to reproduce.Your maybe wondering "I thought humans and apes didn't have equal chromosomes to mate?". That's absolutely right , however more scientific evidence leads to the theory that during the interbreeding of the "unknown" ancestor and apes , two of the chromosomes look as if they had fused together.

Screen shot 2010-11-12 at 3.06.49 AM
Screen shot 2010-11-12 at 3.06.49 AM
​http://www.synapses.co.uk/genetics/chromos.html
"​Thus something unusual must have happened on the way to speciation: an initial split between human and chimp, followed by interbreeding..." says Richard Ingham.This means that mating between was at one point possible.At one point before the fusion of chromosomes, humans and apes were like opposite genders rather than opposite species. 

Citations:
  • Ingham, Richard. "Early humans had sex with chimps ." News in Science (2006): n. pag. Web. 12 Nov 2010. <http://www.abc.net.au/science/news/stories/s1641443.htm>.
  • Ape, . "Apes." How Stuff Works. How Stuff Works, 16 May 2008. Web. 12 Nov 2010. <http://animals.howstuffworks.com/mammals/ape-info.htm>.
  • Marks, Jonathan. "What It Really Means To Be 99% Chimpanzee ."Department of Anthropology (1999): n. pag. Web. 12 Nov 2010. <http://personal.uncc.edu/jmarks/interests/aaa/marksaaa99.htm>
  • MacAandrew, Alec. "Human Chromosome 2 is a fusion of two ancestral chromosomes ." Department of Anthropology n. pag. Web. 11 Nov 2010. <http://www.evolutionpages.com/chromosome_2.htm>.
  • Rodriguez, Monica. "Ask a Geneticist." Tech Museum:Stanford School of Medicine (2007): n. pag. Web. 12 Nov 2010. <http://www.thetech.org/genetics/ask.php?id=229>.
  • Pbs, Science. "Evolution Frequently Asked Questions." PBS Science (2010): n. pag. Web. 12 Nov 2010. <http://www.pbs.org/wgbh/evolution/library/faq/cat03.html>.
Tags: scisocY, Best, evolution
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Whats up with thumbs?

Posted by Perry Woods in Science and Society - Best on Thursday, November 11, 2010 at 8:37 pm

  Everyday we use our hands to do all sorts of task. One of the most important features of our hands is that thing we call a thumb. With the help of having thumbs it has helped humans develop better motor skills. Imagine without our thumbs the things we couldn’t do. Would have our ancestors even developed tools? Would we even be considered as advanced as we are now? Most likely no humans would be.  But how did this opposable thing become on our hand become and are there other creatures with similar appendages?

  When it comes to looking at the evolution of the thumb it is seen with in Homo erectus or Homo habilis. What cause the thumb to become advanced though in our ancestors? A possible idea is the advancement of walking up right as proposed by Suzanna Kemmer. It is thought that as our ancestors began to walk up right there was now new usage for their hands. From this they created tools and learned to use resources that were around. Another possibility is the development of a gene enhancer known as HACNS1 that was found by Yale scientist. The HACNS1 enhancer is thought of as being a “human-specific gene enhancers, which are switches near genes in the human genome.”
 
  Knowing the possibility of our thumb makes us wonder how certain other animals developed their own thumbs. Primates have four categories that divide them based upon their thumbs. There are non-opposable, pseudo-opposable, opposable and opposable long. What causes their classification of thumbs different from ours is the fact that their thumbs do not fully rotate along its axis like our own does. So categories are divided by the amount of independence the thumb has. Other animals with “thumbs” are Giant Pandas (not a actual thumb but a extra bone that functions as one to help them eat bamboo), certain marsupials (in order to climb and gather food) and most birds also have an opposable digit.
 
  Without the thumb or in the case of other animals with thumb like appendages where would they be? Where would we be? Better yet one should ponder with this special adaptation we have what could possible evolve next from it as an adaptation. Will our thumbs slowly change in shape, size or movement? Or will that happen to another species? Who is to actually say what will happen. All we can do is watch what will take place.


Sources:
http://www.primates.com/faq/index.html
http://books.google.com/books?id=5fttVRAHA4MC&pg=PR11&dq=Ankel-Simons,+Friderun+(2007).+Primate+Anatomy+(3rd+ed.).&hl=en&ei=F4zcTNuyKoL78Aaw9JjrCQ&sa=X&oi=book_result&ct=result&resnum=1&ved=0CDEQ6AEwAA#v=onepage&q=nonopposable%20thumb&f=false
http://www.molecularstation.com/science-news/2008/09/junk-dna-hacns1-discovery/
http://onlinelibrary.wiley.com/doi/10.1002/ajpa.1330150203/abstract
http://www.ruf.rice.edu/~kemmer/Evol/opposablethumb.html
canine-front-paw-bones-compare
canine-front-paw-bones-compare
thumb
thumb
comparison-primate-hands
comparison-primate-hands
Tags: thumb, evolution, 12th grade, Best, scisocY
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"Hanuman Langurs: Evolution and Social Behavior"

Posted by Amber Housley in Science and Society - Best on Thursday, November 11, 2010 at 7:13 pm

How Does Evolution Impact the Social Behavior of Hanuman Langurs?

hlangur

The Hanuman Langur is an Asian monkey; whose social behavior is uncanny. Their troops consist of both males and females numbering around 125. The head male—of a troop where there is one male—is competing with other males to maintain his position as leader. When a group of males overthrow the leader —so to speak—they kill his offspring. After that “ritual” one male becomes they new leader. That male then mates with the females of the troop and the process is repeated. The males gain a reproductive advantage because the females are at their maximum sexual receptivity when they lose their offspring.

·      This species is vulnerable to infanticide.

·      Males attack the infants only if they were not present at the time of contraception.

·      The males are usually protective of their offspring, however some still kill their own young.

 Ecology, Social Structure & Evolution

·      Ecology pressures that influence sex ratio populations also affect group size and social structure.

·      Increasing the Hanuman Langur troop size might prevent takeover and infanticide.

 One study reports that species such as:  P.ursinus, Propithecus diadema, and Semnopithecus entellus (Hanuman Langur) have over a 10 percent mortality rate of infants. Another species, the Red Howler species, shows that the rate of infanticide increases with group size. However, there was a change in rate when the Red Howler groups became large enough to cause paternal confusion—the males in the species normally do not kill their own young. The confusion causes males refrain from infanticide, which causes an overall decrease in the infanticide rate.

Because the social behavior of the Hanuman Langur depends on ecology...ecological evolution impacts the behavior. The ecology of the Hanuman Langur includes varied troop sizes and varied troop constituents, which evoke different behaviors. As previously stated, troop size impacts the level of infanticide.

Questions for Research

What does the social behavior of hanuman langur imply about evolutionary desires to be a leader or at an advantage by any means?

What does this behavior say about evolution in general?

Hanuman Langur selectivity and evolution…

Sources

www.eva.mpg.de/ipse/pdfs/Ostner_etal2006.pdf

http://chapmanresearch.mcgill.ca/publications.html

http://www.theprimata.com/semnopithecus_entellus.html

http://www.cabrillo.edu/~crsmith/hanumanlangurs.html           

 

​
Tags: evolution, Best, scisocY
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Disease: Evolution in Humans Vs. Animals

Posted by Glenn Brailsford in Science and Society - Best on Thursday, November 11, 2010 at 6:03 pm

Question: How do diseases in animals and diseases in humans show the different evolutionary paths that we have gone down and what does it say about our immune systems?


Animals and humans can get the same diseases but to my knowledge there are some diseases that we are immune to that they aren't and vice versa. Humans have had an advantage for the past century or so with having plumbing access to for the most part clean water and other means to prevent and fight diseases. Penicillin and amoxicillin are among pills that are made to fight and prevent diseases. Animals on the other hand have evolved in the wild where they have to rely on natural selection and how they have evolved to adapt in their environments to fight off sickness and disease.


Zoonotic diseases are diseases naturally able to transfer from animals to humans and vice versa. This shows that we share some of the same immune system capabilities as animals. For instance it is known that while sharks are able to get cancer their immune system prevents cancer/tumors from being able to grow.The recent Swine Flu outbreak is recent evidence of this resulting in many people becoming ill and around 12,000 actual deaths in the U.S. in the recent 2009-2010 outbreaks, and shows how diseases originate in animals and transfer to humans. AIDS however is a disease that cannot from my knowledge and research thus far, be contracted by animals except for in chimps. Is this because of our DNA similarities and because of the similar evolutionary path that we have gone down? Also, how has the evolutionary path of diseases influence how and who it effects between animals and humans? What about the sharks? Has evolving in the ocean over these millions of years gave them a sort of advantage from not letting cancer or tumors progress?

These following links show other diseases and how either vaccines are similar or animals and humans can contract similar diseases.


http://news.bbc.co.uk/2/hi/health/7270562.stm

http://www.mrmcmed.org/aids.html

http://biology.clc.uc.edu/courses/bio105/immune.htm

http://www.ncbi.nlm.nih.gov/bookshelf/br.fcgi?book=imm&part=A1480

http://www.nature.com/nature/journal/v248/n5446/abs/248344a0.html

http://www.elasmo-research.org/education/topics/p_bite_on_cancer.htm

http://pin.primate.wisc.edu/aboutp/pets/zoonoses.html



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