কম্পউটারে যখন
আমরা কোন কাজ সম্পাদনের জন্য মাউস ক্লিক করি তখন সাথে সাথেই কম্পউটারের অভ্যন্তরস্ত
যন্ত্রগুলো সক্রিয় হয়ে জটিল গানিতিক প্রক্রিয়ায় হাজার হাজার ডাটা প্রসেস করে আপনার
সামনের মনিটরে বা অন্য আউটপুট মাধ্যমে তার ফলাফল দিয়ে দেয় অবিশ্বাস্য দ্রুত গতিতে ।বাহ্যিক
দৃষ্টিতে কাজেটাকে অতি সাধারণ মনে হলও আসলে কিন্তু তা নয় । জ্ঞানীরা এখানে কম্পউটারের
প্রতিটি যন্ত্রাংশের জটিল বৈজ্ঞানিক প্রক্রিয়ায় প্রস্তুত এবং সেগুলোর অবিম্বাস্য কর্মদক্ষতার
কথা উপলব্ধি করতে পেরে এর আবিষ্কারক,নির্মাতা বিজ্ঞানীদের প্রশংসা করেন ও ধন্যবাদ দিয়ে
থাকেন। অপর দিকে নির্বোধেরা কম্পউটারকে বাজার থেকে কিনে আনা এক সাধারন যন্ত্র ছাড়া
আর কিছু মনে করতে পারে না তবে এটাকে তারা নিজে নিজে সৃস্টবস্তু বলেও মনে করে না ! কিন্তু
প্রকৃতিতে অসংখ্য বস্ত বা প্রানী যাদের আভ্যন্তরীন গঠন ও কর্ম পদ্ধতি কল্পনাতীতভাবে
উন্নত জটিল জৈব-যান্ত্রিক প্রক্রিয়াগুলি কোন অতি উন্নতমানের বৈজ্ঞানিক সত্বা দ্বারা
সৃস্ট না হয়ে আপনা আপনি সৃস্টি হয়েছে এরকম ধারনা করাটা কতটুকু যুক্তিসঙ্গত? নির্বোধ
যুক্তিহীন তথাকথিত মুক্তচিন্তার অধিকারীরা জবাব দিবে কি???
চিন্তাধারার দাসত্ব!
প্রথমে আসা যাক ধর্ম নিয়ে সমালোচনা-কোন হিন্দুকে খ্রীষ্টান/বৌদ্ধ ধর্ম সম্পর্কে বা কোন খ্রীষ্টানকে হিন্দু/বৌদ্ধ ধর্ম সম্পর্কে কিংবা কোন বৌদ্ধকে খ্রীষ্টান/হিন্দু ধর্ম সম্পর্কে সমালোচনা করা , কটাক্ষ করা বা তাদের ধর্মের প্রবক্তার বিরুদ্ধে কুৎসা রটনা করতে শুনেছেন কেউ ?? সালোচনা ও কটাক্ষ করার পর সেটাকে মুক্ত চিন্তা বলে সস্তা চালাকি করার প্রয়াসও পান না। তাহলে একমাত্র ইসলাম ধর্ম সম্পর্কে ব্যতিক্রম কেন ?? উল্লিখিত অন্য তিন প্রধান ধর্মের অনেকে এমনকি তাদের অনুকরনে কিছু কুলাঙ্গার মুসলমান ও ইসলাম ধর্মকে ফ্রি ষ্টাইলে কটাক্ষ করা,সমালোচনা করা এবং এর প্রবক্তা মহনবী হযরত মুহম্মদ (স:) সম্পর্কে কটুক্তি করা ইত্যাদি অত্যন্ত নির্লজ্যভাবে ও সাবলীল ভাবে করে চলেছে । এতসব নির্লজ্য অপকর্ম করে তাকে আবার বলা হচ্ছে মুক্ত চিন্তা ও বাক স্বাধীনতা !! এগুলো কেন করা হয় তা ভেবে দেখার প্রয়োজনীয়তাটাই হল সত্য উন্মোচন। আর তা করে আমাদের চিন্তাধারাকে পাশ্চাত্য শয়তানী শক্তির দাসত্বমূলক চিন্তাধারা থেকে মুক্তি পেতে হবে। সাহস থাকলে কউ একজন উত্তর দিতে পারে।
সত্য উদঘাটন
অবশেষে বুঝা গেল ইসলামকে গালি দেওয়া,সমালোচনা করা মানে মুক্ত চিন্তা!! একনিস্ঠ হিন্দু,খৃস্টান,বৌদ্ধ হলে মৌলবাদী-ধর্মান্ধ হয় না। বৌদ্ধ ভিক্ষুরা যখন মিয়ানমারে গণহারে মুসলিম নিধন করে তখন বিশ্ববাসী,মুক্ত চিন্তার মানুষেরা নিশ্চুপ এমনকি মনে মনে দারুন খুশী ! আর কোন মুসলিম সঙ্গত কারনেও কোন হিন্দু,খৃস্টান,বৌদ্ধকে হত্যা করলে তাবত বিশ্ব ও তথাকথিত মুক্ত মনের মানুষদের চিৎকারের ঠেলাই ঠিকা দায়। কোন বিবেকান বা যুক্তিবাদী আছে কি তার জবাব দিতে????
মুক্ত চিন্তার জগতে পদার্পন
মুক্ত চিন্তার জগতে স্বাগতম! সনাতনের বিরুদ্ধে সমালোচনাতে কোন কৃতিত্ব নেই। সহস্র বছরের অর্জিত জ্ঞানকে পরখ করা যেতে পারে। বিখ্যাত হওয়ার বালকসুলভ পাশ্চাত্য মন্ত্রগুলো মানুষকে নিশ্চিতই মন্দের দিকে ধাবিত করে। সময় বয়ে যায় আসল সত্যকে উদঘাটন করার ।
Banking stem cells could save Japan nuclear workers
Health officials should collect blood from workers at the crippled Fukushima Daiichi nuclear power plant in case they are accidentally exposed to high levels of radiation and need a stem cell transplant, Japanese researchers said on Thursday.
They said gathering blood from the workers would give them a ready source of their own stem cells that could help rebuild their bone marrow should they become exposed to high levels of radiation.
"The danger of a future accidental radiation exposure is not passed, since there has been a series of serious aftershocks even this April," Dr Shuichi Taniguchi of Toranomon Hospital in Tokyo and Dr Tetsuya Tanimoto of the Japanese Foundation for Cancer Research wrote in the Lancet medical journal.
A series of strong aftershocks this week has rattled eastern Japan, slowing the recovery effort at the Fukushima Daiichi plant due to temporary evacuations of workers and power outages.
Tokyo Electric Power Co said this week the situation at the nuclear plant, wrecked by a 15-meter (49.2-foot) tsunami on March 11, had stabilized. The crisis is now rated par with the world's worst nuclear accident, the 1986 Chernobyl disaster, although the total release of radiation at Chernobyl was far greater.
The researchers say transplant teams are standing by in Japan and Europe to collect and store the nuclear workers' cells, but so far the Nuclear Safety Commission of Japan is balking because it would cause a "physical and psychological burden for nuclear workers," the team wrote.
Collecting cells from the workers has several advantages over donated cells, which require finding a matching donor and carry the risk of rejection.
Stem cell transplants from a person's own cells would allow the workers to avoid taking drugs to suppress the immune system, helping them to better resist infections. The cells could quickly restore normal function to the body's machinery for making blood cells.
And the workers' cells could be banked and stored in case they develop leukemia, which could happen years down the road.
But the solution is not perfect, the team admits. High exposure to radiation would also attack cells in the gut, skin or lung -- problems a stem cell transplant could not fix.
Yet, with containment and clean-up efforts at the damaged plant expected to drag on for months or even years, Tanimoto and Taniguchi say taking steps to protect the workers' from future harm is paramount.
"The most important mission is to save the nuclear workers' lives and to protect the local communities," the team wrote.
"Such an approach would be the industry's best defense: if a fatal accident happened to the nuclear workers, the nuclear power industry of Japan would collapse."
They said gathering blood from the workers would give them a ready source of their own stem cells that could help rebuild their bone marrow should they become exposed to high levels of radiation.
"The danger of a future accidental radiation exposure is not passed, since there has been a series of serious aftershocks even this April," Dr Shuichi Taniguchi of Toranomon Hospital in Tokyo and Dr Tetsuya Tanimoto of the Japanese Foundation for Cancer Research wrote in the Lancet medical journal.
A series of strong aftershocks this week has rattled eastern Japan, slowing the recovery effort at the Fukushima Daiichi plant due to temporary evacuations of workers and power outages.
Tokyo Electric Power Co said this week the situation at the nuclear plant, wrecked by a 15-meter (49.2-foot) tsunami on March 11, had stabilized. The crisis is now rated par with the world's worst nuclear accident, the 1986 Chernobyl disaster, although the total release of radiation at Chernobyl was far greater.
The researchers say transplant teams are standing by in Japan and Europe to collect and store the nuclear workers' cells, but so far the Nuclear Safety Commission of Japan is balking because it would cause a "physical and psychological burden for nuclear workers," the team wrote.
Collecting cells from the workers has several advantages over donated cells, which require finding a matching donor and carry the risk of rejection.
Stem cell transplants from a person's own cells would allow the workers to avoid taking drugs to suppress the immune system, helping them to better resist infections. The cells could quickly restore normal function to the body's machinery for making blood cells.
And the workers' cells could be banked and stored in case they develop leukemia, which could happen years down the road.
But the solution is not perfect, the team admits. High exposure to radiation would also attack cells in the gut, skin or lung -- problems a stem cell transplant could not fix.
Yet, with containment and clean-up efforts at the damaged plant expected to drag on for months or even years, Tanimoto and Taniguchi say taking steps to protect the workers' from future harm is paramount.
"The most important mission is to save the nuclear workers' lives and to protect the local communities," the team wrote.
"Such an approach would be the industry's best defense: if a fatal accident happened to the nuclear workers, the nuclear power industry of Japan would collapse."
Scientists find way to map brain's complexity
Scientists say they have moved a step closer to developing a computer model of the brain after finding a way to map both the connections and functions of nerve cells in the brain together for the first time.
In a study in the journal Nature on Sunday, researchers from Britain's University College London (UCL) described a technique developed in mice which enabled them to combine information about the function of neurons with details of their connections.
The study is part of an emerging area of neuroscience research known as 'connectomics'. A little like genomics, which maps our genetic make-up, connectomics aims to map the brain's connections, known as synapses.
By untangling and being able to map these connections -- and deciphering how information flows through the brain's circuits -- scientists hope to understand how thoughts and perceptions are generated in the brain and how these functions go wrong in diseases such as Alzheimer's, schizophrenia and stroke.
"We are beginning to untangle the complexity of the brain," said Tom Mrsic-Flogel, who led the study.
"Once we understand the function and connectivity of nerve cells spanning different layers of the brain, we can begin to develop a computer simulation of how this remarkable organ works."
But he said would take many years of work among scientists and huge computer processing power before that could be done.
In a report of his research, Mrsic-Flogel explained how mapping the brain's connections is no small feat: There are an estimated one hundred billion nerve cells, or neurons, in the brain, each connected to thousands of other nerve cells, he said, making an estimated 150 trillion synapses.
"How do we figure out how the brain's neural circuitry works? We first need to understand the function of each neuron and find out to which other brain cells it connects," he said.
In this study, Mrsic-Flogel's team focused on vision and looked into the visual cortex of the mouse brain, which contains thousands of neurons and millions of different connections.
Using high resolution imaging, they were able to detect which of these neurons responded to a particular stimulus.
Taking a slice of the same tissue, the scientists then applied small currents to subsets of neurons to see which other neurons responded and which of them were synaptically connected.
By repeating this technique many times, they were able to trace the function and connectivity of hundreds of nerve cells in visual cortex.
Using this method, the team hopes to begin generating a wiring diagram of a brain area with a particular function, such as the visual cortex. The technique should also help them map the wiring of regions that underpin touch, hearing and movement.
John Williams, head of neuroscience and mental health at the Wellcome Trust medical charity, which helped fund the study, said understanding the brain's inner workings was one of science's "ultimate goals."
"This important study presents neuroscientists with one of the key tools that will help them begin to navigate and survey the landscape of the brain," he said.
In a study in the journal Nature on Sunday, researchers from Britain's University College London (UCL) described a technique developed in mice which enabled them to combine information about the function of neurons with details of their connections.
The study is part of an emerging area of neuroscience research known as 'connectomics'. A little like genomics, which maps our genetic make-up, connectomics aims to map the brain's connections, known as synapses.
By untangling and being able to map these connections -- and deciphering how information flows through the brain's circuits -- scientists hope to understand how thoughts and perceptions are generated in the brain and how these functions go wrong in diseases such as Alzheimer's, schizophrenia and stroke.
"We are beginning to untangle the complexity of the brain," said Tom Mrsic-Flogel, who led the study.
"Once we understand the function and connectivity of nerve cells spanning different layers of the brain, we can begin to develop a computer simulation of how this remarkable organ works."
But he said would take many years of work among scientists and huge computer processing power before that could be done.
In a report of his research, Mrsic-Flogel explained how mapping the brain's connections is no small feat: There are an estimated one hundred billion nerve cells, or neurons, in the brain, each connected to thousands of other nerve cells, he said, making an estimated 150 trillion synapses.
"How do we figure out how the brain's neural circuitry works? We first need to understand the function of each neuron and find out to which other brain cells it connects," he said.
In this study, Mrsic-Flogel's team focused on vision and looked into the visual cortex of the mouse brain, which contains thousands of neurons and millions of different connections.
Using high resolution imaging, they were able to detect which of these neurons responded to a particular stimulus.
Taking a slice of the same tissue, the scientists then applied small currents to subsets of neurons to see which other neurons responded and which of them were synaptically connected.
By repeating this technique many times, they were able to trace the function and connectivity of hundreds of nerve cells in visual cortex.
Using this method, the team hopes to begin generating a wiring diagram of a brain area with a particular function, such as the visual cortex. The technique should also help them map the wiring of regions that underpin touch, hearing and movement.
John Williams, head of neuroscience and mental health at the Wellcome Trust medical charity, which helped fund the study, said understanding the brain's inner workings was one of science's "ultimate goals."
"This important study presents neuroscientists with one of the key tools that will help them begin to navigate and survey the landscape of the brain," he said.
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