Sebuah kelompok penelitian di Korea telah mengembangkan suatu metode untuk merekayasa jaringan hati buatan dengan menggunakan microfluidic.
Hati merupakan salah satu organ yang sangat penting pada tubuh manusia. Hal ini diperkirakan memiliki lebih dari 500 fungsi, termasuk menetralisir dan menghancurkan obat dan racun, serta mengubah makanan menjadi energi. Transplantasi merupakan salha satu cara untuk mengkompensasi jika adanya gagal hati, oleh karena itu penelitian ini dilakukan untuk mengembangkan suatu metode untuk menciptakan jaringan hati 3D buatan yang dapat meregulasikan fungsi khusus.Tampilkan postingan dengan label berita penting. Tampilkan semua postingan
Tampilkan postingan dengan label berita penting. Tampilkan semua postingan
Target antikanker arsenik terungkap
Posted by muhammad rizki alim di 22.36Para peneliti dari Cina dan Perancis mempercayai bahwa mereka telah mengungkap mekanisme molekular dengan apa arsenik trioksida membunuh sel kanker tertentu. Arsenik merupakan metalloid yang sangat beracun dan telah digunakan pada pengobatan ala Cina selama berabad – abad guna menyembuhkan beberapa penyakit seperti psoriasis dan syphilis. Baru – baru saja zat ini telah menunjukkan keefektifannya melawan acute promyelocytic leukaemia (APL), suatu kanker darah.
Arsenik trioksida telah digunakan dalam medis selama berabad – abad, namun sekarang tinggal misteri tentang bagaimana zat ini dapat membunuh kanker yang sedang dipecahkan.
Menggiatkan penelitian penyakit tidur
Posted by muhammad rizki alim di 22.32Tersedianya suatu obat penyakit tidur Afrika yang diminum sedikit lagi akan menjadi kenyataan, kata ilmuwan Inggris yang mempercayai bahwa suatu obat dapat meningkatkan tingkat hidup lebih dari 50,000 orang yang menderita penyakit tersebut. Para peneliti telah mengembangkan suatu molekul yang berperan pada protein target baru, dan membunuh parasit yang bertanggung jawab atas penyakit ini.
Tim dari Paul Wyatt dari University of Dundee, bersama – sama dengan para koleganya dari University of York, mengembangkan beberapa molekul yang menghalangi N-myristoyl transferase (NMT) pada parasit Trypanosoma brucei. NMT menambahkan suatu asam lemak karbon 14 pada ujung lebih dari 60 rantai protein didalam parasit tersebut, yang mempengaruhi lokalisasi proteins, stabilitas dan fungsinya. ‘Yang membuat NMT sebagai target yang sangat bagus,’ kata Wyatt, ‘karena jika kita menghalangi hanya salah satu enzim saja kita akan mendapatkan berbagai konsekwensi downstream yang ada. Yang memberikannya kesempatan lebih besar dalam memiliki aktifitas anti parasitis.’
Ion karbenium telah terungkap
Posted by muhammad rizki alim di 22.30Suatu pandangan yang penting kedalam mekanisme reaksi hidrokarbon telah diungkapkan oleh para ilmuwan yang sedang di Perancis.
Transformasi terkatalisis dari hidrokarbon sangatlah penting pada industi petrokimia akan tetapi kelambanan mereka haruslah diatasi dengan dikerjakan dibawah tekanan dan suhu yang tinggi. Jean Sommer dan para koleganya pada University of Strasbourg telah menunjukkan keberadaan beberapa ion karbenium pada transformasi hidrokarbon pada katalis mineral zeolite. Beberapa ion tersebut pada umumnya diterima sebagai intermediate reaksi namun formasi mereka sepenuhnya belumlah dimengerti.
Resin Sintetik Terbarukan dan Dapat Terdegradasi Secara Alami
Posted by muhammad rizki alim di 22.27Dewasa ini, resin sintetik dibuat dari bahan-bahan fosil, seperti halnya minyak bumi.
Resin sintetik ini relatif tidak dapat terurai secara alami (non-biodegradable) dan hanya dapat dibakar dengan tindakan pencegahan yang ketat serta dapat menghasilkan zat toksik bergantung pada jenis monomernya. Polimer sintetik yang berasal dari bahan fosil ini telah lama menjadi permasalahan lingkungan, karena sifatnya yang relatif tidak dapat diurai secara alami sehingga menimbulkan berbagai dampak buruk terhadap lingkungan. Permasalahan ini memerlukan suatu inovasi untuk mengganti penggunaan polimer sintetik yang tak terurai dengan jenis polimer lain yang mudah terurai secara alami.
Resin sintetik ini relatif tidak dapat terurai secara alami (non-biodegradable) dan hanya dapat dibakar dengan tindakan pencegahan yang ketat serta dapat menghasilkan zat toksik bergantung pada jenis monomernya. Polimer sintetik yang berasal dari bahan fosil ini telah lama menjadi permasalahan lingkungan, karena sifatnya yang relatif tidak dapat diurai secara alami sehingga menimbulkan berbagai dampak buruk terhadap lingkungan. Permasalahan ini memerlukan suatu inovasi untuk mengganti penggunaan polimer sintetik yang tak terurai dengan jenis polimer lain yang mudah terurai secara alami.
Mengubah Polusi Panas Menjadi Energi Listrik
Posted by muhammad rizki alim di 22.25Peneliti dari Northwestern University telah menemukan suatu material yang dapat memanfaatkan polusi panas yang dihasilkan dari mesin kalor untuk menghasilkan listrik. Para peneliti tersebut menempatkan nanokristal garam batu (stronsium tellurida, SrTe) ke dalam timbal tellurida (PbTe). Material ini telah terbukti dapat mengkonversi kalor yang dihasilkan sistem pembuangan kendaraan (knalpot), mesin-mesin dan alat-alat industri yang menghasilkan kalor, hingga cahaya matahari dengan efisiensi yang jauh lebih tinggi dibanding penemuan-penemuan serupa sebelumnya.
Material Organik Alamiah Terlarut Memainkan Peranan Penting dalam Siklus Merkuri di Lingkungan Akuatik
Posted by muhammad rizki alim di 22.17Alam memiliki suatu hubungan reaksi yang sulit dijelaskan dengan merkuri atau raksa. Tetapi para peneliti dari Department of Energy’s Oak Ridge National Laboratory telah berhasil membuat suatu penemuan yang dapat menjelaskan hubungan yang aneh ini.
Ketika para ilmuwan telah mengetahui bahwa beberapa mikroba di lingkungan perairan dapat menghasilkan metilmerkuri, suatu bentuk senyawa organomerkuri yang lebih beracun dibanding merkuri itu sendiri yang terakumulasi dalam tubuh ikan, mereka juga mengetahui bahwa alam dan beberapa spesies bakteri lainnya dapat mengubah metilmerkuri ke dalam bentuk yang kurang toksik. Hal yang kurang mereka pahami sepenuhnya adalah bahwa mekanisme transformasi ini terjadi pada keadaan lingkungan yang anoksik atau kurang oksigen.
Obat Anti-Kanker dari Nanopartikel
Posted by muhammad rizki alim di 22.08Para peneliti dari Massachusetts Institute of Technology (MIT) dan Brigham and Women’s Hospital menunjukkan bahwa mereka dapat mengantarkan obat kanker cisplatin jauh lebih efektif dan aman ke dalam sel tumor prostat dengan menggunakan enkapsulasi partikel yang hanya teraktivasi setelah mencapai sel target.
Eksperimen Kimia Terbesar dalam Perayaan Tahun Kimia Internasional 2011
Posted by muhammad rizki alim di 16.56Tahun 2011 ini merupakan tahun yang sangat bersejarah bagi para peneliti, ilmuwan, akademisi, praktisi, maupun para pecinta kimia di seluruh dunia karena UNESCO dan IUPAC telah menetapkan tahun ini sebagai Tahun Kimia Internasional 2011 (International Year of Chemistry/IYC 2011).
Sejak dibuka secara resmi pada tanggal 27 Januari 2011 di markas besar UNESCO di Paris, Perancis, telah dijadwalkan berbagai macam acara perayaan Tahun Kimia Internasional 2011 ini. Salah satu acara yang cukup fenomenal adalah diadakannya eksperimen kimia terbesar di dunia yang serentak digelar di seluruh dunia pada 22 Maret 2011.
Tips On Choosing And Buying The Right Inkjet Cartridges
Posted by muhammad rizki alim di 11.48With the advent of information technology, more and more people are buying and using computers. This is because computers facilitate and accelerate all of the activities and transactions of most businesses.
Along with the computers, the printers are also one of the busiest tools that are being utilized by the people. Hence, with constant use, inks may start to decline. When this happens, the outcome of the printed materials will be poor. It may appear discolored and dull.
That is why most experts contend that it is extremely important for most computer owners to use the right inkjet cartridges. Using the proper materials for your printer will promote better and quality prints.
However, choosing the right inkjet cartridges for your printer can be a daunting task. Hence, it is important that you know some guides when buying inkjet cartridges to ensure the quality of print output that you want to achieve.
Here is a list that you can use in buying inkjet cartridges:
1. Do not buy standard inkjet cartridges
Inkjet cartridges of this kind will only damage the "nozzles" of your printers. This is because standard inkjet cartridges may not fit the nozzles of your printer.
Generally, inkjet cartridges have their own sizes that are specifically made to fit a particular printer. Hence, using the wrong size will definitely ruin your printer's nozzles.
2. Be wary on the warranty
Most of the printers come with a warranty. However, there are some cases that might void this warranty like using inkjet cartridges that are manufactured by a different producer.
So if you want to continue using the warranty, it is best that you buy inkjet cartridges that are manufactured by the same maker of your printer.
Along with the computers, the printers are also one of the busiest tools that are being utilized by the people. Hence, with constant use, inks may start to decline. When this happens, the outcome of the printed materials will be poor. It may appear discolored and dull.
That is why most experts contend that it is extremely important for most computer owners to use the right inkjet cartridges. Using the proper materials for your printer will promote better and quality prints.
However, choosing the right inkjet cartridges for your printer can be a daunting task. Hence, it is important that you know some guides when buying inkjet cartridges to ensure the quality of print output that you want to achieve.
Here is a list that you can use in buying inkjet cartridges:
1. Do not buy standard inkjet cartridges
Inkjet cartridges of this kind will only damage the "nozzles" of your printers. This is because standard inkjet cartridges may not fit the nozzles of your printer.
Generally, inkjet cartridges have their own sizes that are specifically made to fit a particular printer. Hence, using the wrong size will definitely ruin your printer's nozzles.
2. Be wary on the warranty
Most of the printers come with a warranty. However, there are some cases that might void this warranty like using inkjet cartridges that are manufactured by a different producer.
So if you want to continue using the warranty, it is best that you buy inkjet cartridges that are manufactured by the same maker of your printer.
3. Be wary of buying inkjet cartridges online
Today, online shopping can do great wonders, especially because it gives you the convenience of purchasing a product without having to go to the shop.
However, if you will buy inkjet cartridges online, there are some dangers that might go with it. For instance, frauds and scams are lurking in the Internet today. Hence, you might be buying an inkjet cartridge that is of low quality or of the wrong specifications, different from what they advertise online, of course.
So it is extremely important to be sure of the inkjet cartridges that you are going to buy online and make sure that you can ask for a refund or an exchange for the item if in case you were satisfied with it.
4. Consider the price
When buying inkjet cartridges, it is best to consider the price of the items. They may vary from one shop to another. Hence, it is important to shop around and compare so as to get the best buy. Just be sure that you get the same kind of inkjet cartridge with the same manufacturer.
If you cannot afford to buy original inkjet cartridges, you can opt for refills. Just try to look for quality refilling stations that will give you the same quality ink as that of the original one.
Indeed, buying inkjet cartridges could be very tricky, and yet, it is not that complicated as well. The only important thing to remember is the model, size, and the manufacturer of your printer's inkjet cartridges. Given all that, you are ready to make the best inkjet cartridge purchases.
Today, online shopping can do great wonders, especially because it gives you the convenience of purchasing a product without having to go to the shop.
However, if you will buy inkjet cartridges online, there are some dangers that might go with it. For instance, frauds and scams are lurking in the Internet today. Hence, you might be buying an inkjet cartridge that is of low quality or of the wrong specifications, different from what they advertise online, of course.
So it is extremely important to be sure of the inkjet cartridges that you are going to buy online and make sure that you can ask for a refund or an exchange for the item if in case you were satisfied with it.
4. Consider the price
When buying inkjet cartridges, it is best to consider the price of the items. They may vary from one shop to another. Hence, it is important to shop around and compare so as to get the best buy. Just be sure that you get the same kind of inkjet cartridge with the same manufacturer.
If you cannot afford to buy original inkjet cartridges, you can opt for refills. Just try to look for quality refilling stations that will give you the same quality ink as that of the original one.
Indeed, buying inkjet cartridges could be very tricky, and yet, it is not that complicated as well. The only important thing to remember is the model, size, and the manufacturer of your printer's inkjet cartridges. Given all that, you are ready to make the best inkjet cartridge purchases.
Designing sites for search engines and directories
Posted by muhammad rizki alim di 11.38In terms of layout, many web sites are not designed for optimum search engine and directory visibility. People or companies seem so centred on their corporate or personal images, products, and services that they neglect to design their web sites with search engines and directories in mind. Search engines and directories vary in the way they rank your web site in a search query. Some search engines place primary emphasis on the text within your title tags. Some search engines place emphasis on the main ideas presented in all of your text on a single web page. Some directories emphasize the text you submitted in their "Description" field. How and where you place your text, both in the copy your visitors see and within the HTML tags your visitors do not see, will affect your ranking
Keyword selection
Keyword placement
Keyword frequency
Links & architecture
Site statistics
Keyword Selection
Of primary importance is selecting the best keywords for your industry and the keywords you believe your potential customers will use to find you. Selecting the right keywords requires research.
Look at your company's printed materials. What words do you use over and over? When you speak to new and current customers on the phone, what questions do they frequently ask and what words do they use? Ask your current customers how they would find you on the Internet. Then go to the major search engines and directories. Type in the keywords you want to use. Study the source code of the web sites that appeared in the top 20. Look at how your competitors ranked in a search query. Adjust your keyword selection accordingly.
Keyword placement
Of equal importance is keyword placement on individual pages. The text in your title tag is one the most important elements for ranking well in search engines. The text in your titles should be descriptive, using the words and lingo in your industry, and should accurately reflect the contents of each web page.
For optimum search engine positions, your keywords need to appear at the top of your web pages. Thus, before you design your web page, ask yourself if you (or your web designer) have strategically placed your keywords within your title tags, meta-tags, headings, graphic images, and the first paragraph within your body tag. If not, you might need to rethink your site design.
Keyword Frequency
What is important to both the search engines and your target audience is keyword frequency and keyword prominence. Designing and coding your site with keywords in the right locations and the right frequency is an art form. Keywords need to appear frequently on your web pages, but if they appear too frequently, your site will be penalized for word stacking (also known as "spamming the index") or could be removed permanently from the index.
Also, some search engines ignore meta-tags. Thus, if you have included your keywords in your meta-tags but have not placed them elsewhere, you have missed a huge target audience, namely AOL users. Sites with frames have problems being indexed well because there is little opportunity otherwise to include additional text with keywords.
Keyword selection
Keyword placement
Keyword frequency
Links & architecture
Site statistics
Keyword Selection
Of primary importance is selecting the best keywords for your industry and the keywords you believe your potential customers will use to find you. Selecting the right keywords requires research.
Look at your company's printed materials. What words do you use over and over? When you speak to new and current customers on the phone, what questions do they frequently ask and what words do they use? Ask your current customers how they would find you on the Internet. Then go to the major search engines and directories. Type in the keywords you want to use. Study the source code of the web sites that appeared in the top 20. Look at how your competitors ranked in a search query. Adjust your keyword selection accordingly.
Keyword placement
Of equal importance is keyword placement on individual pages. The text in your title tag is one the most important elements for ranking well in search engines. The text in your titles should be descriptive, using the words and lingo in your industry, and should accurately reflect the contents of each web page.
For optimum search engine positions, your keywords need to appear at the top of your web pages. Thus, before you design your web page, ask yourself if you (or your web designer) have strategically placed your keywords within your title tags, meta-tags, headings, graphic images, and the first paragraph within your body tag. If not, you might need to rethink your site design.
Keyword Frequency
What is important to both the search engines and your target audience is keyword frequency and keyword prominence. Designing and coding your site with keywords in the right locations and the right frequency is an art form. Keywords need to appear frequently on your web pages, but if they appear too frequently, your site will be penalized for word stacking (also known as "spamming the index") or could be removed permanently from the index.
Also, some search engines ignore meta-tags. Thus, if you have included your keywords in your meta-tags but have not placed them elsewhere, you have missed a huge target audience, namely AOL users. Sites with frames have problems being indexed well because there is little opportunity otherwise to include additional text with keywords.
Very, very few web sites can get in the Top 10 of all the major search engines (AltaVista, FAST Search, HotBot, Google, Lycos, Teoma) without spamming. We cannot emphasize this enough: if you hire anyone (a submission service, an individual, an online promotion service, etc.) to do the services we just described, they need to have HTML and design experience, online marketing, and excellent copy writing skills. You do not want your web site to be permanently banned from a search engine or directory due to ignorance or lack of experience. Furthermore, submission services usually do just that: submit. Many do not perform keyword research, the HTML coding, and copy writing necessary to get a site optimally placed within the search engines. Ask a lot of questions before handing over any money.
Links & site architecture
Placing keywords throughout your web pages is useless as a search engine marketing strategy if the search engine spiders are unable to record the text on your web pages. Therefore, always have a link architecture (also known as a site map) on your site that the search engine spiders can follow. Oftentimes, this means having two forms of navigation on your site: one that your target audience prefers, and one for the search engines.
Site Statistics
For the first few months after you have your web site submitted to the major search engines and directories, you should see a jump in traffic. If you look at your site reports with your visitor statistics, which should do frequently, you will see when the search engines spider and index your site.
Hopefully, because you have been thoughtful enough to give potential customers a reason to return to your site again and again, people will bookmark your site, and your web statistics will show an increase in a "No Referrer" category under referral URL's. Your site reports should show you where your potential customers are coming from (i.e. which search engine or directory they used to find you) and which keywords they used to find you.
After your site has listed in the search engines and directories for a few months, review your site statistics and determine where the majority of your traffic comes from. Then focus your advertising efforts on those directories and search engines. You get better sales from targeted marketing than from spreading your net too wide.
One client did exactly what we recommended, from keyword selection to monitoring site statistics. They found most of their sites referral traffic came from Yahoo queries. They bought banner space from Yahoo for two months. Whenever two of their keywords were typed in a search query, their banner would appear. Their traffic increased over 500%, and their sales reached five figures per month.
Lastly, the saying "Content is King" still rings true. You can increase traffic to your web site, but if (1) people do not like what they see, (2) you do not offer potential customers what they want to buy, or (3) you do not give customers incentive to stay and/or bookmark your site, they will click off of your web site as quickly as they clicked on to it.
Links & site architecture
Placing keywords throughout your web pages is useless as a search engine marketing strategy if the search engine spiders are unable to record the text on your web pages. Therefore, always have a link architecture (also known as a site map) on your site that the search engine spiders can follow. Oftentimes, this means having two forms of navigation on your site: one that your target audience prefers, and one for the search engines.
Site Statistics
For the first few months after you have your web site submitted to the major search engines and directories, you should see a jump in traffic. If you look at your site reports with your visitor statistics, which should do frequently, you will see when the search engines spider and index your site.
Hopefully, because you have been thoughtful enough to give potential customers a reason to return to your site again and again, people will bookmark your site, and your web statistics will show an increase in a "No Referrer" category under referral URL's. Your site reports should show you where your potential customers are coming from (i.e. which search engine or directory they used to find you) and which keywords they used to find you.
After your site has listed in the search engines and directories for a few months, review your site statistics and determine where the majority of your traffic comes from. Then focus your advertising efforts on those directories and search engines. You get better sales from targeted marketing than from spreading your net too wide.
One client did exactly what we recommended, from keyword selection to monitoring site statistics. They found most of their sites referral traffic came from Yahoo queries. They bought banner space from Yahoo for two months. Whenever two of their keywords were typed in a search query, their banner would appear. Their traffic increased over 500%, and their sales reached five figures per month.
Lastly, the saying "Content is King" still rings true. You can increase traffic to your web site, but if (1) people do not like what they see, (2) you do not offer potential customers what they want to buy, or (3) you do not give customers incentive to stay and/or bookmark your site, they will click off of your web site as quickly as they clicked on to it.
13 Gen Baru Pengaruhi Penyakit Jantung
Posted by muhammad rizki alim di 22.33Para ilmuwan telah menemukan 13 varian gen baru yang meningkatkan resiko penyakit jantung seseorang. Penyakit jantung dikenal sebagai penyakit mematikan nomor satu di dunia.
"Penemuan dari 13 varian gen yang belum diketahui dari sekira 10 gen baru, dapat memberikan petunjuk bagaimana melakukan perawatan efektif bagi penyakit jantung ke depannya," ujar para ilmuwan. Demikian seperti yang dikutip dari The Straits Times, Senin (7/3/2011).
Pengertian worm
Posted by muhammad rizki alim di 14.57ber
Worm…dalam dunia computer, adalah suatu program computer yang di desain untuk mengandakan dirinya sendiri pada system (jaringan ) computer, sehingga system akan mengalami gangguan, kerewelan, atau kemacetan…istilah nya mah hang..or lemot.Penggunaan kembali perangkat lunak
Posted by muhammad rizki alim di 14.56
Kita mempelajari manfaat penggunaan kembali segera setelah kita melihat dunia secara rasional. Kita menggunakan kembali hamper setiap hal, ide-ide, objek, argument, abstaraksi, proses yang membangun kehidupan sehari hari.
“menciptakan kembali” mewakili dengan baik kondisi tersebut. Frase itu menyiratkan beberapa arti – secara ekonomis, secara intelektual, dan secara pragmitis , untuk menemukan lagi apa yang telah di temukan. Selama hampir setengah abad frase tersebut mengganggu komunitas perangkat lunak.
Reuse adalah sebuah aktivitas, bukan objek. Reuse merupakan aktivitas biasa seperti pada umunya, dimana sebagian besar kamus bahkan tidak mendaftarkannya
Dalam konyeks pembuatan system yang intensif dengan perangkat lunak, reuse merupakan procedure yang menghasilkan (atau membantu menghasilkan) sebuah system dengan menggunakan kembali sesuatu dari suatu usaha pengembangan terakhir.
“menciptakan kembali” mewakili dengan baik kondisi tersebut. Frase itu menyiratkan beberapa arti – secara ekonomis, secara intelektual, dan secara pragmitis , untuk menemukan lagi apa yang telah di temukan. Selama hampir setengah abad frase tersebut mengganggu komunitas perangkat lunak.
Reuse adalah sebuah aktivitas, bukan objek. Reuse merupakan aktivitas biasa seperti pada umunya, dimana sebagian besar kamus bahkan tidak mendaftarkannya
Dalam konyeks pembuatan system yang intensif dengan perangkat lunak, reuse merupakan procedure yang menghasilkan (atau membantu menghasilkan) sebuah system dengan menggunakan kembali sesuatu dari suatu usaha pengembangan terakhir.
Pluzit – Layanan Bookmark and Share
Posted by muhammad rizki alim di 12.02
Perkembangan penggunaan jejaring sosial seperti Facebook, Twitter, Plurk, dan lainnya sangatlah pesat. Melalui jejaring sosial tersebut, pengguna tak sekedar mengirimkan update mengenai apa yang mereka lakukan, tetapi juga menjadi ajang berbagi konten-konten menarik yang mereka temukan dalam suatu blog atau website yang mereka kunjungi. Dengan melihat keadaan tersebut, bagi Anda pemilik blog atau website tentunya tak ingin melewatkan kesempatan bahwa halaman blog atau website Anda dibagi oleh pengunjung blog atau webite Anda ke teman-teman mereka melalui layanan
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