Archive for the ‘Biology’ Category


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Monday, January 10th, 2011

Human_placenta

The placenta is an organ that connects the developing fetus to the uterine wall to allow nutrient uptake, waste elimination, and gas exchange via the mother’s blood supply Placentas are a defining characteristic of eutherian or “placental” mammals, but are also found in some snakes and lizards with varying levels of development up to mammalian levelsThe word placenta comes from the Latin for cake, mammals produce a choriovitelline placenta that, while connected to the uterine wall, provides nutrients mainly derived from the egg sac

Endocrine function

In humans, aside from serving as the conduit for oxygen and nutrients for fetus, placenta secretes hormone (secreted by syncytial layer/syncytiotrophoblast of chorionic villi)that is important during pregnancy.

Hormones:

Human Chorionic Gonadotropin (hCG). The first placental hormone produced is hCG, which can be found in maternal blood and urine as early as the first missed menstrual period (shortly after implantation has occurred) through about the 100th day of pregnancy. This is the hormone analyzed by pregnancy test; a false-negative result from a pregnancy test may be obtained before or after this period. Women’s blood serum will be completely negative for hCG by one to two weeks after birth. hCG testing is proof that all placental tissue is delivered. hCG is only present during pregnancy because it is secreted by the placenta, which of course is present only[8] during pregnancy. hCG also ensures that the corpus luteum continue to secrete progesterone and estrogen. Progesterone is very important during pregnancy because when its secretion decreases, endometrial lining will slough off and pregnancy will be lost. hCG suppresses the maternal immunologic response so that placenta is not rejected.

Human Placental Lactogen (hPL [Human Chorionic Somatomammotropin]). This hormone is lactogenic and growth-promoting properties. It promotes mammary gland growth in preparation for lactation in the mother. It also regulates maternal glucose, protein, fat levels so that this is always available to the fetus.

Estrogen. It is referred to as the “hormone of woman” because it influences the female appearance. It contributes to the woman’s mammary gland development in preparation for lactation and stimulates uterine growth to accommodate growing fetus.

Progesterone. This is referred to as the “hormone of mothers” because it is necessary to maintain endometrial lining of the uterus during pregnancy. This hormone prevents preterm labor by reducing myometrial contraction. This hormone is high during pregnancy


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Decaying process


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Sunday, August 8th, 2010

How do worms form in decaying matter?Where do they come from?


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ബ്ലഡ്സ്മിയര്‍ തയ്യാറാക്കുമ്പോള്‍ ശ്രദ്ധിക്കേണ്ട കാര്യങ്ങള്‍


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Sunday, August 1st, 2010

1.പൂപ്പല്‍ ബാധിച്ച സ്ലൈഡ് ഉപയോഗിക്കാതിരിക്കുക

2.സ്പിരിറ്റ് ഉപയോഗിച്ച് കോട്ടണ്‍ കൊണ്ട് സ്ലൈഡ് വൃത്തിയാക്കുക

3.അണുവിമുക്തമായ ഒരു ലാന്‍സെറ്റ് കൊണ്ട് രക്തം എടുക്കുക

4.ഒരു തുള്ളി രക്തം സ്ലൈഡില്‍ ഇറ്റിക്കുക

5.സ്ലൈഡില്‍ എടുത്ത ബ്ലഡ് , മറ്റൊരു സ്ലൈഡ്കൊണ്ട് ഏകദേശം “tongue shape” (ഒരു ഭാഗം thin) ആക്കിയ ശേഷം ഉണങ്ങി കഴിഞ്ഞാല്‍ stain ചെയ്യുക(Leishman’s stain—-dilute ആക്കേണ്ടതില്ല)

6.stain ഒഴിക്കുമ്പോള്‍ slideനിരപ്പായ പ്രതലത്തിലായിരിക്കാന്‍ ശ്രദ്ധിക്കുക

    7. stain ഒഴിച്ച് 2 മിനിറ്റിന് ശേഷം decolorising ന് വേണ്ടി distilled water ഒഴിക്കുക.5 മിനിറ്റ് സമയം വെള്ളം ഒഴിച്ച് നിര്‍ത്തുക

    8. 5മിനിറ്റിന് ശേഷം വെള്ളം ഒഴിച്ച് കഴുകുക.സ്ലൈഡിന്റെ അടിഭാഗം തുടച്ച് വൃത്തിയാക്കുക.വീണ്ടും ഉണങ്ങാന്‍ അനുവദിക്കുക.

    9. ഉണങ്ങിയശേഷം liquid parafin ഒരു തുള്ളി ഒഴിക്കുക

    10. 100x objective oil-ല്‍ മുട്ടിക്കുക

    11. നിരീക്ഷിക്കുക

    കടപ്പാട്-ശ്രീ ജോസഫ് മാസ്ററര്‍ ജി.വി.എച്ച്.എസ്.എസ്.കൊപ്പം (പാലക്കാട് ജില്ല)


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ALZHEIMER’S


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Sunday, July 11th, 2010

Alzheimer’s ultimately affects all parts of the brain but each person is affected differently as the disease progresses. In part this is due to the nature and extent of damage being caused to different areas of the brain. Each section of the brain is known as a lobe: a lobe simply means a part of an organ (earlobe for example).Here, we examine the effects of damage to the temporal lobe of the brain. The temporal lobe of the brain are essential for memory. Our memory for events is known as episodic memory. Episodic memory help us to remember things such as where we left the car keys. For this type of memory to work we need to be able to take in new knowledge and hold on to it, a process known as encoding. Properly encoded information makes the next stage of episodic memory, known as retrieval, a little easier(I left the car key in the kitchen).embedded by Embedded Video

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Damage to the temporal lobes, and parts of the frontal lobes ,means that while certain objects might be recognized there isalzhiemers little or no ability to capture new information and remember it later. Because there are different types of memory each is affected differently according to the severity of damage. In such circumstances a person with early memory problems can be helped to recall information with cues such as photographs, or reminding the person of other people who were at a particular event, and so on.

People sometimes wonder why memory for events is so problematic in Alzheimer”s,yet the person doesn’t seem to forget words, can still construct sentences ,and can remember other facts? This is because another type of memory, known as semantic memory, is being used .It is episodic memory that is most affected in Alzheimer’s disease. This may help to explain why it can be a little disconcerting to listen to your mother tell you how to bake a cake but in the next breath ask where they are and who are you.



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Compound microscope


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Sunday, July 4th, 2010

As microscope is an important aid for teaching Biology,something about it.

Important parts

eye piece—-5x, 10x, 15x

objectives—10x (low power)

45x (High power)

100x (Oil immersion)

mirror—–plano concave (plane &concave)

in addition iris diaphragm,condenser lens,coarse adjuster,fine adjuster etc.

Low power objective

mirror——concave

iris diaphragm—–half opened

condenser——lowered

High power objective

mirror——concave

iris diaphragm—–3/4th opened

condenser——raise slightly

Oil immersion objective

mirror——plane

iris diaphragm—–fully opened

condenser——fully raised


MicroscopeLabeled

indebtedness—-Joseph master GVHSS Koppam , Palakkad Dt.


Warning: strtotime() [function.strtotime]: It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected 'UTC' for 'GMT/0.0/no DST' instead in /home/harisjhs/public_html/helpdesk/wp-includes/functions.php on line 35

Warning: date() [function.date]: It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected 'UTC' for 'GMT/0.0/no DST' instead in /home/harisjhs/public_html/helpdesk/wp-includes/functions.php on line 43

Warning: strtotime() [function.strtotime]: It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected 'UTC' for 'GMT/0.0/no DST' instead in /home/harisjhs/public_html/helpdesk/wp-includes/functions.php on line 35

Warning: date() [function.date]: It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected 'UTC' for 'GMT/0.0/no DST' instead in /home/harisjhs/public_html/helpdesk/wp-includes/functions.php on line 43

Acetylcholine-topic related to 10th standard biology


Warning: strtotime() [function.strtotime]: It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected 'UTC' for 'GMT/0.0/no DST' instead in /home/harisjhs/public_html/helpdesk/wp-includes/functions.php on line 35

Warning: date() [function.date]: It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected 'UTC' for 'GMT/0.0/no DST' instead in /home/harisjhs/public_html/helpdesk/wp-includes/functions.php on line 107

Warning: date() [function.date]: It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected 'UTC' for 'GMT/0.0/no DST' instead in /home/harisjhs/public_html/helpdesk/wp-includes/functions.php on line 109

Warning: date() [function.date]: It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected 'UTC' for 'GMT/0.0/no DST' instead in /home/harisjhs/public_html/helpdesk/wp-includes/functions.php on line 111

Warning: date() [function.date]: It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected 'UTC' for 'GMT/0.0/no DST' instead in /home/harisjhs/public_html/helpdesk/wp-includes/functions.php on line 112
Sunday, June 27th, 2010

DGI-Ill-AcetylcholineBy, Pramykrish


Warning: strtotime() [function.strtotime]: It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected 'UTC' for 'GMT/0.0/no DST' instead in /home/harisjhs/public_html/helpdesk/wp-includes/functions.php on line 35

Warning: date() [function.date]: It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected 'UTC' for 'GMT/0.0/no DST' instead in /home/harisjhs/public_html/helpdesk/wp-includes/functions.php on line 43

Warning: strtotime() [function.strtotime]: It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected 'UTC' for 'GMT/0.0/no DST' instead in /home/harisjhs/public_html/helpdesk/wp-includes/functions.php on line 35

Warning: date() [function.date]: It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected 'UTC' for 'GMT/0.0/no DST' instead in /home/harisjhs/public_html/helpdesk/wp-includes/functions.php on line 43

Why it is important to control the balance of water in our bodies?


Warning: strtotime() [function.strtotime]: It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected 'UTC' for 'GMT/0.0/no DST' instead in /home/harisjhs/public_html/helpdesk/wp-includes/functions.php on line 35

Warning: date() [function.date]: It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected 'UTC' for 'GMT/0.0/no DST' instead in /home/harisjhs/public_html/helpdesk/wp-includes/functions.php on line 107

Warning: date() [function.date]: It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected 'UTC' for 'GMT/0.0/no DST' instead in /home/harisjhs/public_html/helpdesk/wp-includes/functions.php on line 109

Warning: date() [function.date]: It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected 'UTC' for 'GMT/0.0/no DST' instead in /home/harisjhs/public_html/helpdesk/wp-includes/functions.php on line 111

Warning: date() [function.date]: It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected 'UTC' for 'GMT/0.0/no DST' instead in /home/harisjhs/public_html/helpdesk/wp-includes/functions.php on line 112
Sunday, June 27th, 2010

Our bodies take in water from food and drinks.We even get some water when we breathe, by burning glucose te release energy.we lose water in sweat, faeces, urine, and when we breath out.For the cells of our body to work properly, it is important that their water content is maintained at the correct level.

This means our body must maintain a balance between the water we lose.Our kidneys do this work.The kidneys absorb only as much glucose, water and salt as the body needs.The rest is passed out of the body as urine.

Either too little water in our bodies can be disastrous.Too little water can result in the skin shrinking, mouth and tongue drying out, hallucinations – and can even cause death.Too much water causes nausea, weakness, convulsions, coma, and death as well.So, the importance maintaining the correct balance of waterin our bodies cannot be over-emphasized.

By, Pramykrish



Warning: strtotime() [function.strtotime]: It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected 'UTC' for 'GMT/0.0/no DST' instead in /home/harisjhs/public_html/helpdesk/wp-includes/functions.php on line 35

Warning: date() [function.date]: It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected 'UTC' for 'GMT/0.0/no DST' instead in /home/harisjhs/public_html/helpdesk/wp-includes/functions.php on line 43

Warning: strtotime() [function.strtotime]: It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected 'UTC' for 'GMT/0.0/no DST' instead in /home/harisjhs/public_html/helpdesk/wp-includes/functions.php on line 35

Warning: date() [function.date]: It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected 'UTC' for 'GMT/0.0/no DST' instead in /home/harisjhs/public_html/helpdesk/wp-includes/functions.php on line 43

solar eclipse


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Warning: date() [function.date]: It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected 'UTC' for 'GMT/0.0/no DST' instead in /home/harisjhs/public_html/helpdesk/wp-includes/functions.php on line 107

Warning: date() [function.date]: It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected 'UTC' for 'GMT/0.0/no DST' instead in /home/harisjhs/public_html/helpdesk/wp-includes/functions.php on line 109

Warning: date() [function.date]: It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected 'UTC' for 'GMT/0.0/no DST' instead in /home/harisjhs/public_html/helpdesk/wp-includes/functions.php on line 111

Warning: date() [function.date]: It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected 'UTC' for 'GMT/0.0/no DST' instead in /home/harisjhs/public_html/helpdesk/wp-includes/functions.php on line 112
Tuesday, June 22nd, 2010

in khss kannadi solar eclipse observed by the pupils

Image052


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Warning: date() [function.date]: It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected 'UTC' for 'GMT/0.0/no DST' instead in /home/harisjhs/public_html/helpdesk/wp-includes/functions.php on line 43

Warning: strtotime() [function.strtotime]: It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected 'UTC' for 'GMT/0.0/no DST' instead in /home/harisjhs/public_html/helpdesk/wp-includes/functions.php on line 35

Warning: date() [function.date]: It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected 'UTC' for 'GMT/0.0/no DST' instead in /home/harisjhs/public_html/helpdesk/wp-includes/functions.php on line 43

Absorption of Energy from sun by the Plants


Warning: strtotime() [function.strtotime]: It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected 'UTC' for 'GMT/0.0/no DST' instead in /home/harisjhs/public_html/helpdesk/wp-includes/functions.php on line 35

Warning: date() [function.date]: It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected 'UTC' for 'GMT/0.0/no DST' instead in /home/harisjhs/public_html/helpdesk/wp-includes/functions.php on line 107

Warning: date() [function.date]: It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected 'UTC' for 'GMT/0.0/no DST' instead in /home/harisjhs/public_html/helpdesk/wp-includes/functions.php on line 109

Warning: date() [function.date]: It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected 'UTC' for 'GMT/0.0/no DST' instead in /home/harisjhs/public_html/helpdesk/wp-includes/functions.php on line 111

Warning: date() [function.date]: It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected 'UTC' for 'GMT/0.0/no DST' instead in /home/harisjhs/public_html/helpdesk/wp-includes/functions.php on line 112
Sunday, June 20th, 2010

What is the percentage of light energy received by the green plants from Sun? In 9th biology text book, it is 5%, but in 10th biology text book, it is 1%. Which is correct?


Warning: strtotime() [function.strtotime]: It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected 'UTC' for 'GMT/0.0/no DST' instead in /home/harisjhs/public_html/helpdesk/wp-includes/functions.php on line 35

Warning: date() [function.date]: It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected 'UTC' for 'GMT/0.0/no DST' instead in /home/harisjhs/public_html/helpdesk/wp-includes/functions.php on line 43

Warning: strtotime() [function.strtotime]: It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected 'UTC' for 'GMT/0.0/no DST' instead in /home/harisjhs/public_html/helpdesk/wp-includes/functions.php on line 35

Warning: date() [function.date]: It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected 'UTC' for 'GMT/0.0/no DST' instead in /home/harisjhs/public_html/helpdesk/wp-includes/functions.php on line 43

Broca’s area


Warning: strtotime() [function.strtotime]: It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected 'UTC' for 'GMT/0.0/no DST' instead in /home/harisjhs/public_html/helpdesk/wp-includes/functions.php on line 35

Warning: date() [function.date]: It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected 'UTC' for 'GMT/0.0/no DST' instead in /home/harisjhs/public_html/helpdesk/wp-includes/functions.php on line 107

Warning: date() [function.date]: It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected 'UTC' for 'GMT/0.0/no DST' instead in /home/harisjhs/public_html/helpdesk/wp-includes/functions.php on line 109

Warning: date() [function.date]: It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected 'UTC' for 'GMT/0.0/no DST' instead in /home/harisjhs/public_html/helpdesk/wp-includes/functions.php on line 111

Warning: date() [function.date]: It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected 'UTC' for 'GMT/0.0/no DST' instead in /home/harisjhs/public_html/helpdesk/wp-includes/functions.php on line 112
Tuesday, March 2nd, 2010


മനുഷ്യ മസ്തിഷ്കത്തിലെ “Broca’s area” എന്താണെന്ന്
വിശദീകരിക്കാമോ.