Toplam 122 içerik listeleniyor
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The Genetic Structure of Anatolia: From the Neolithic to the Oghuz Migrations
Anatolia has witnessed many migrations and has been home to a variety of civilizations. The increasing availability of ancient DNA samples from different periods and cultures makes it now possible to examine the genetic changes that have taken place in Anatolia since the Neolithic. The ancient DNA revolution has already dispelled many myths, but myths and legends die hard. Some of the more persistent ones concern the impact of the last migration wave to hit Anatolia, marked by the arrival of...
https://www.biyologlar.com/the-genetic-structure-of-anatolia-from-the-neolithic-to-the-oghuz-migrations -
Tarih öncesi insanlarda Hepatit B virüsü bulunduğu ortaya çıktı
Hepatitis viral partiküllerinin illustrasyonu Kaynak: ISTOCK, SARATHSASIDHARAN
https://www.biyologlar.com/tarih-oncesi-insanlarda-hepatit-b-virusu-bulundugu-ortaya-cikti -
Tarih öncesi insanlarda Hepatit B virüsü bulunduğu ortaya çıktı
Hepatitis viral partiküllerinin illustrasyonu Kaynak: ISTOCK, SARATHSASIDHARAN
https://www.biyologlar.com/tarih-oncesi-insanlarda-hepatit-b-virusu-bulundugu-ortaya-cikti -
Tarih öncesi insanlarda Hepatit B virüsü bulunduğu ortaya çıktı
Hepatitis viral partiküllerinin illustrasyonu Kaynak: ISTOCK, SARATHSASIDHARAN
https://www.biyologlar.com/tarih-oncesi-insanlarda-hepatit-b-virusu-bulundugu-ortaya-cikti -
Kanser Tedavisine Bakteriler ve Nano Robotlar
Kana enjekte edilen ilaçların hastalıklı hücrelere adrese teslim ve nokta atışı ulaştığı zamanların eşiğindeyiz. Bizleri gereksiz bıçakaltı işlemlerden ve ilaçların yan etkilerinden koruyacak, bakteri ve nano robotların insanların iyiliği için işbirliği yaptıkları tıbbi yöntemleri inceleyeceğiz.Askerleri küçültüp mikro boyutlara getirebilecek teknolojinin sırrına sahip bilim adamı Jan Benes, CIA ajanlarının yardımıyla SSCB’den kaçar. Ancak bu esnada...
https://www.biyologlar.com/kanser-tedavisine-bakteriler-ve-nano-robotlar -
Scientists reconstruct ancient impact that dwarfs dinosaur-extinction blast
Picture this: A massive asteroid almost as wide as Rhode Island and about three to five times larger than the rock thought to have wiped out the dinosaurs slams into Earth. The collision punches a crater into the planet's crust that's nearly 500 kilometers (about 300 miles) across: greater than the distance from Washington, D.C. to New York City, and up to two and a half times larger in diameter than the hole formed by the dinosaur-killing asteroid. Seismic waves bigger than any recorded...
https://www.biyologlar.com/scientists-reconstruct-ancient-impact-that-dwarfs-dinosaur-extinction-blast -
“Dinlerin evrimi” mi “Evrimin dini” mi?
Sık sık duyarsınız bu iki kelimeyi “Dinlerin Evrimi.” Öyle ki pekçok kaynakta neredeyse bilimsel bir gerçeklik gibi sunulur. Nedir bu “dinlerin evrimi” meselesi? 19.yüzyılıın sonundan itibaren darwinizm, büyük bir hızla kabul gördü ve biyolojiden başlayıp ekonomi, psikoloji, sosyoloji, antropoloji ve tarih gibi hemen her alanı yaygın bir biçimde etkiledi. Bu, “din” olgusuna da “dinlerin evrimi” olarak yansıdı. Böylelikle de insanlığın son derece...
https://www.biyologlar.com/dinlerin-evrimi-mi-evrimin-dini-mi -
Ascaris lumbricoides
Ascaris lumbricoides is otherwise known as the large intestinal roundworm of humans. It looks a lot like a large earthworm, but the two are not related. The earthworm is an annelid; it lives in the soil, feeding on organic debris. A. lumbricoides is a parasitic nematode, or roundworm; adults are found only in the intestines of humans, feeding on intestinal contents as they flow past. If you were to compare the two very carefully, you would note that the earthworm has little tufts of bristles...
https://www.biyologlar.com/ascaris-lumbricoides -
Functional human liver cells grown in the lab
In new research appearing in the prestigious journal Nature Biotechnology, an international research team led by The Hebrew University of Jerusalem describes a new technique for growing human hepatocytes in the laboratory. This groundbreaking development could help advance a variety of liver-related research and applications, from studying drug toxicity to creating bio-artificial liver support for patients awaiting transplantations. The liver is the largest internal organ in the human body,...
https://www.biyologlar.com/functional-human-liver-cells-grown-in-the-lab -
Closing the case on an ancient archeological mystery
Climate change may be responsible for the abrupt collapse of civilization on the fringes of the Tibetan Plateau around 2000 B.C. WSU archaeologist Jade D'Alpoim Guedes and an international team of researchers found that cooling global temperatures at the end of the Holocene Climatic Optimum, a 4,000 year period of warm weather, would have made it impossible for ancient people on the Tibetan Plateau to cultivate millet, their primary food source. Guedes' team's research recently was published...
https://www.biyologlar.com/closing-the-case-on-an-ancient-archeological-mystery -
Lab experiments question popular measure of ancient ocean temperatures
Understanding the planet's history is crucial if we are to predict its future. While some records are preserved in ice cores or tree rings, other records of the climate's ancient past are buried deep in the seafloor. An increasingly popular method to deduce historic sea surface temperatures uses sediment-entombed bodies of marine archaea, one of Earth's most ancient and resilient creatures, as a 150-million-year record of ocean temperatures. While other measures have gaps, this one is...
https://www.biyologlar.com/lab-experiments-question-popular-measure-of-ancient-ocean-temperatures -
Odd histone helps suppress jumping genes in stem cells, study says
A family of proteins known as histones provides support and structure to DNA, but for years, scientists have been puzzling over occasional outliers among these histones, which appear to exist for specific, but often mysterious reasons. Now, researchers have uncovered a new purpose for one such histone variant: preventing genetic mutations by keeping certain so-called "jumping genes" in place. This research, which began at Rockefeller University and was published May 4 in Nature, reveals a...
https://www.biyologlar.com/odd-histone-helps-suppress-jumping-genes-in-stem-cells-study-says -
Herpes outbreak, other marine viruses linked to coral bleaching event
A study at Oregon State University has concluded that significant outbreaks of viruses may be associated with coral bleaching events, especially as a result of multiple environmental stresses. One such event was documented even as it happened in a three-day period. It showed how an explosion of three viral groups, including a herpes-like virus, occurred just as corals were bleaching in one part of the Great Barrier Reef off the east coast of Australia. The findings, reported in Frontiers in...
https://www.biyologlar.com/herpes-outbreak-other-marine-viruses-linked-to-coral-bleaching-event -
Spider and centipede venom evolved from insulin-like hormone
Funnel-web spider venom contains powerful neurotoxins that instantly paralyze prey (usually insects). Millions of years ago, however, this potent poison was just a hormone that helped ancestors of these spiders regulate sugar metabolism, similar to the role of insulin in humans. Surprisingly, this hormone's weaponization--described on June 11 in the journal Structure--occurred in arachnids as well as centipedes, but in different ways. Researchers at the University of Queensland in Australia...
https://www.biyologlar.com/spider-and-centipede-venom-evolved-from-insulin-like-hormone -
Clues contained in ancient brain point to the origin of heads in early animals
A new study from the University of Cambridge has identified one of the oldest fossil brains ever discovered - more than 500 million years old - and used it to help determine how heads first evolved in early animals. The results, published today (7 May) in the journal Current Biology, identify a key point in the evolutionary transition from soft to hard bodies in early ancestors of arthropods, the group that contains modern insects, crustaceans and spiders. The study looked at two types of...
https://www.biyologlar.com/clues-contained-in-ancient-brain-point-to-the-origin-of-heads-in-early-animals -
Scientists discover oldest plant root stem cells
Scientists at Oxford University have discovered the oldest known population of plant root stem cells in a 320 million-year-old fossil.
https://www.biyologlar.com/scientists-discover-oldest-plant-root-stem-cells -
Programlı hücre ölümü
Sorunuzun Cevabı burada var. www.biyologlar.com/index.php?option=com_...atid=25&id=1881#2266 Animasyon: Apoptosis: Overview www.promega.com/paguide/animation/selector.htm?coreName=apop01 Apoptosis: Intrinsic Triggers www.promega.com/paguide/animation/selector.htm?coreName=apop02 Apoptozis hakkında bilgiler Programlanmış hücre ölümü Programlanmış hücre ölümü (PHÖ veya PCD), herhangi bir hücrenin, hücre içi bir programla ölmesinin planlaması ve...
https://www.biyologlar.com/programli-hucre-olumu -
Tiny genetic tweak unlocked corn kernels during domestication
If not for a single genetic mutation, each kernel on a juicy corn cob would be trapped inside a inedible casing as tough as a walnut shell. The mutation switches one amino acid for another at a specific position in a protein regulating formation of these shells in modern corn's wild ancestor, according to a study published in the July 2015 issue of GENETICS, a publication of the Genetics Society of America. "Humans completely reshaped the ancestor of corn, effectively turning the cob inside...
https://www.biyologlar.com/tiny-genetic-tweak-unlocked-corn-kernels-during-domestication -
Discovery of a salamander in amber sheds light on evolution of Caribbean islands
More than 20 million years ago, a short struggle took place in what is now the Dominican Republic, resulting in one animal getting its leg bitten off by a predator just before it escaped. But in the confusion, it fell into a gooey resin deposit, to be fossilized and entombed forever in amber. The fossil record of that event has revealed something not known before - that salamanders once lived on an island in the Caribbean Sea. Today, they are nowhere to be found in the entire Caribbean...
https://www.biyologlar.com/discovery-of-a-salamander-in-amber-sheds-light-on-evolution-of-caribbean-islands -
Sonic hedgehog gene provides evidence that our limbs may have evolved from sharks' gills
Latest analysis shows that human limbs share a genetic programme with the gills of cartilaginous fishes such as sharks and skates, providing evidence to support a century-old theory on the origin of limbs that had been widely discounted.
https://www.biyologlar.com/sonic-hedgehog-gene-provides-evidence-that-our-limbs-may-have-evolved-from-sharks-gills -
Searching for an ancient syphilis DNA in newborns
The ancient bones of newborns are very useful to recover the ancient DNA of the bacteria causing syphilis, the Treponema pallidum pallidum. This is the conclusion reached by a study led by Universitat Autònoma de Barcelona (UAB), which was able to obtain the genetic material from the bacteria in more than one individual, in what is considered to be the oldest case known to date. Several previous intents had only achieved to yield this material in one occasion and from only one...
https://www.biyologlar.com/searching-for-an-ancient-syphilis-dna-in-newborns -
'Fourth strand' of European ancestry originated with hunter-gatherers isolated by Ice Age
The first sequencing of ancient genomes extracted from human remains that date back to the Late Upper Palaeolithic period over 13,000 years ago has revealed a previously unknown "fourth strand" of ancient European ancestry. This new lineage stems from populations of hunter-gatherers that split from western hunter-gatherers shortly after the 'out of Africa' expansion some 45,000 years ago and went on to settle in the Caucasus region, where southern Russia meets Georgia today. Here these...
https://www.biyologlar.com/fourth-strand-of-european-ancestry-originated-with-hunter-gatherers-isolated-by-ice-age -
8. Balkan Mikrobiyoloji Kongresi
Discover the charm of Veliko Tarnovo – the old capital of the Second Bulgarian Kingdom hiding at its heart fascinating tales of ancient times and glorious battles. Reveal the secrets of a town, established more than 7000 years ago, with thousands of traces of the remarkable history of a heroic nation.With an amazing infrastructure, located in the very heart of the city, Interhotel Veliko Tarnovo offers you everything you may need for a pleasant stay or a perfect event.Stunning panoramic...
https://www.biyologlar.com/8-balkan-mikrobiyoloji-kongresi -
Fossil find reveals just how big carnivorous dinosaur may have grown
An unidentified fossilised bone in a museum has revealed the size of a fearsome abelisaur and may have solved a hundred-year old puzzle. Alessandro Chiarenza, a PhD student from Imperial College London, last year stumbled across a fossilised femur bone, left forgotten in a drawer, during his visit to the Museum of Geology and Palaeontology in Palermo Italy. He and a colleague Andrea Cau, a researcher from the University of Bologna, got permission from the museum to analyse the femur. They...
https://www.biyologlar.com/fossil-find-reveals-just-how-big-carnivorous-dinosaur-may-have-grown -
Ancient algae found deep in tropical glacier
The remains of tiny creatures found deep inside a mountaintop glacier in Peru are clues to the local landscape more than a millennium ago, according to a new study by Rice University, the University of Nebraska-Lincoln and Ohio State University. The unexpected discovery of diatoms, a type of algae, in ice cores pulled from the Quelccaya Summit Dome Glacier demonstrate that freshwater lakes or wetlands that currently exist at high elevations on or near the mountain were also there in earlier...
https://www.biyologlar.com/ancient-algae-found-deep-in-tropical-glacier -
Calcium channel blockers caught in the act at atomic level
Atomic resolution studies of two common calcium channel blockers, one that treats irregular heart beats, and another that controls high blood pressure and angina
https://www.biyologlar.com/calcium-channel-blockers-caught-in-the-act-at-atomic-level -
Calcium channel blockers caught in the act at atomic level
Atomic resolution studies of two common calcium channel blockers, one that treats irregular heart beats, and another that controls high blood pressure and angina
https://www.biyologlar.com/calcium-channel-blockers-caught-in-the-act-at-atomic-level -
Penn study reveals how fish control microbes through their gills
Oriol Sunyer, a professor at the University of Pennsylvania School of Veterinary Medicine, has described fish as "an open gut swimming."
https://www.biyologlar.com/penn-study-reveals-how-fish-control-microbes-through-their-gills -
DNA of bacteria crucial to ecosystem defies explanation
This image shows a colony of Trichodesmium.
https://www.biyologlar.com/dna-of-bacteria-crucial-to-ecosystem-defies-explanation -
Octopus genome reveals cephalopod secrets
Researchers from UC Berkeley, the Okinawa Institute of Science and Technology Graduate University and the University of Chicago have sequenced and annotated the first cephalopod genome
https://www.biyologlar.com/octopus-genome-reveals-cephalopod-secrets -
First fossil facial tumor discovered in a dwarf duck-billed dinosaur from Transylvania
The first-ever record of a tumourous facial swelling found in a fossil has been discovered in the jaw of the dwarf dinosaur Telmatosaurus transsylvanicus, a type of primitive duck-billed dinosaur known as a hadrosaur.
https://www.biyologlar.com/first-fossil-facial-tumor-discovered-in-a-dwarf-duck-billed-dinosaur-from-transylvania -
Scientists sequence first ancient Irish human genomes
Excavated near Belfast in 1855, she had lain in a Neolithic tomb chamber for 5,000 years; subsequently curated in Queens University Belfast.
https://www.biyologlar.com/scientists-sequence-first-ancient-irish-human-genomes -
Scientists sequence first ancient Irish human genomes
Excavated near Belfast in 1855, she had lain in a Neolithic tomb chamber for 5,000 years; subsequently curated in Queens University Belfast.
https://www.biyologlar.com/scientists-sequence-first-ancient-irish-human-genomes -
Acorn worm genome reveals gill origins of human pharynx
The acorn worm Saccoglossus kowalevskii is common in brackish, shallow water on the Atlantic coast. Its newly sequenced genome is telling biologists about the genes responsible for pharyngeal gills
https://www.biyologlar.com/acorn-worm-genome-reveals-gill-origins-of-human-pharynx -
Acorn worm genome reveals gill origins of human pharynx
The acorn worm Saccoglossus kowalevskii is common in brackish, shallow water on the Atlantic coast. Its newly sequenced genome is telling biologists about the genes responsible for pharyngeal gills
https://www.biyologlar.com/acorn-worm-genome-reveals-gill-origins-of-human-pharynx -
Unearthed: The cannibal sharks of a forgotten age
Scientists have discovered macabre fossil evidence suggesting that 300 million-year-old sharks ate their own young, as fossil poop of adult Orthacanthus sharks contained the tiny teeth of juveniles.
https://www.biyologlar.com/unearthed-the-cannibal-sharks-of-a-forgotten-age -
Unearthed: The cannibal sharks of a forgotten age
Scientists have discovered macabre fossil evidence suggesting that 300 million-year-old sharks ate their own young, as fossil poop of adult Orthacanthus sharks contained the tiny teeth of juveniles.
https://www.biyologlar.com/unearthed-the-cannibal-sharks-of-a-forgotten-age -
New species of pterosaur discovered in Patagonia
This is a paleoartist's reconstruction of a ptesosaur.
https://www.biyologlar.com/new-species-of-pterosaur-discovered-in-patagonia -
Genome of 6,000-year-old barley grains sequenced for first time
Right: Photograph during excavation exhibiting excellent dry preservation of plant remains Left: A well-preserved, desiccated barley grain found at Yoram Cave
https://www.biyologlar.com/genome-of-6000-year-old-barley-grains-sequenced-for-first-time -
Genome of 6,000-year-old barley grains sequenced for first time
Right: Photograph during excavation exhibiting excellent dry preservation of plant remains Left: A well-preserved, desiccated barley grain found at Yoram Cave
https://www.biyologlar.com/genome-of-6000-year-old-barley-grains-sequenced-for-first-time -
Every grain of rice: Ancient rice DNA data provides new view of domestication history
This is a comparison of ancient rice remains and modern rice.
https://www.biyologlar.com/every-grain-of-rice-ancient-rice-dna-data-provides-new-view-of-domestication-history -
Every grain of rice: Ancient rice DNA data provides new view of domestication history
This is a comparison of ancient rice remains and modern rice.
https://www.biyologlar.com/every-grain-of-rice-ancient-rice-dna-data-provides-new-view-of-domestication-history -
Ökaryotlarda Homolog rekombinasyon
Homolog rekombinasyonun olması çoğu ökaryotik hücrede mitoz ve mayoz için esastır. Mitoz sırasında homolog rekombinasyon, iyonlaştırıcı radyasyon veya DNA'ya hasar verici kimyasalların neden olduğu çift iplikli kırıkları tamir etmeye yarar.[21] Bunların tamir edilmemesi durumda somatik hücrelerde kromozom parçaları arasında büyük ölçekli yer değişimlerine (rearrangement) yol açar,[22] bu da kansere neden olabilir. Mayozda homolog rekombinasyon, profaz I...
https://www.biyologlar.com/okaryotlarda-homolog-rekombinasyon -
DNA ve Özellikleri Hakkında Kapsamlı Bilgi
Deoksiribonükleik asit veya kısaca DNA, tüm organizmalar ve bazı virüslerin canlılık işlevleri ve biyolojik gelişmeleri için gerekli olan genetik talimatları taşıyan bir nükleik asittir. DNA'nın başlıca rolü bilginin uzun süreli saklanmasıdır. Protein ve RNA gibi hücrenin diğer bileşenlerinin inşası için gerekli olan bilgileri içermesinden dolayı DNA; bir kalıp, şablon veya reçeteye benzetilir. Bu genetik bilgileri içeren DNA parçaları gen olarak...
https://www.biyologlar.com/dna-ve-ozellikleri-hakkinda-kapsamli-bilgi -
Apoptozis hakkında bilgiler Programlanmış hücre ölümü
Programlanmış hücre ölümü (PHÖ veya PCD), herhangi bir hücrenin, hücre içi bir programla ölmesinin planlaması ve gerçekleştirilmesidir.[1]. Nekrozdan farklı olarak, ölen hücrelerin sonucunda dokuda akut hasarlanma ve enflamasyon yanıt oluşturulmaz. Programlanmış hücre ölümü, genellikle canlının yaşamı boyunca yarar sağlayan düzenli bir süreçtir. PHÖ, bitkiler ve metazoa gruplarının doku gelişimleri sırasında esasi fonksiyonları sergiler. Apoptozis ya da...
https://www.biyologlar.com/apoptozis-hakkinda-bilgiler-programlanmis-hucre-olumu -
Antik Mısır’daki Evcil Hayvanların Yaşam Koşulları
Antik Mısır’da egzotik canlı hayvan koleksiyonu sahip olmak güç ve zenginlik göstergesiydi. Nil nehrinin kenarında bulunan 5000 yıllık bir mezarda bulunan babun, hipopotam ve diğer hayvanlara ait kemikler yüksek statüye sahip olmamın karanlık tarafını gözler önüne sermekte. Mezarların birinde bulunan babun el ve ayak kemikleri, bu hayvanın açık bir şekilde dövülmüş olduğunu söylemekte. Babunlardan en az iki tanesinin el kemikleri kafasına vurulan darbeleri...
https://www.biyologlar.com/antik-misirdaki-evcil-hayvanlarin-yasam-kosullari -
Buzadam Ötzi’nin Midesinde Gastrit ve Ülser Bakterileri Bulundu
İtalyan Alpleri’ndeki eriyen buzullarda 25 yıl önce keşfedilen 5,300 yıllık mumya Ötzi’nin, gastrit (mide iltihabı) ve ülser gibi mide sorunlarına neden olan bir bakteri taşıdığı ortaya çıktı. Ötzi’de bulunan bakteri türü ayrıca, Afrika’dan Avrupa’ya göçün sanılandan daha sonra gerçekleştiğini gösteriyorGenetik araştırmalar yapan paleopatolog Albert Zink ve mikrobiyolog Frank Maxiner öncülüğündeki ekip, Ötzi’nin midesinin içinde Helicobacter...
https://www.biyologlar.com/buzadam-otzinin-midesinde-gastrit-ve-ulser-bakterileri-bulundu -
Genetiğin Tarihi Gelişimi
TarihçeGenetik bilimi kökenini Mendel’in 19.yy. ortalarındaki çalışmasından alıyorsa da, kalıtım hakkında birçok varsayım Mendel’den daha önce ortaya atılmıştır. Bu varsayımlar genellikle, edinilmiş özelliklerin kalıtım yoluyla aktarımını öne sürmüşlerdir; bu varsayımlarda kişiye ebeveyndeki baskın özelliklerin miras kalması inanışı hakimdi. Günümüzde, evrim teorisi genellikle, türlerin birbirlerinden değişerek oluştuklarını ileri sürmüş...
https://www.biyologlar.com/genetigin-tarihi-gelisimi -
Tek Bir Mutasyon Çok-Hücreliliğin Evrimi İçin Yeterli Olabilir
600 milyon yıldan fazla bir süre önce tek bir mutasyon gerçekleşti ve bu rastgele olay ile tek hücreli atalarımızın, organize ve çok hücreli organizmalar oluşturmalarını sağlayan yeni bir protein fonksiyonu ortaya çıktı.
https://www.biyologlar.com/tek-bir-mutasyon-cok-hucreliligin-evrimi-icin-yeterli-olabilir