Toplam 31 içerik listeleniyor
-
Researchers use human stem cells to create light-sensitive retina in a dish
Using a type of human stem cell, Johns Hopkins researchers say they have created a three-dimensional complement of human retinal tissue in the laboratory, which notably includes functioning photoreceptor cells capable of responding to light, the first step in the process of converting it into visual images.
https://www.biyologlar.com/researchers-use-human-stem-cells-to-create-light-sensitive-retina-in-a-dish -
New Science paper calculates magnitude of plastic waste going into the ocean
A plastic grocery bag cartwheels down the beach until a gust of wind spins it into the ocean. In 192 coastal countries, this scenario plays out over and over again as discarded beverage bottles, food wrappers, toys and other bits of plastic make their way from estuaries, seashores and uncontrolled landfills to settle in the world's seas. How much mismanaged plastic waste is making its way from land to ocean has been a decades-long guessing game. Now, the University of Georgia's Jenna Jambeck...
https://www.biyologlar.com/new-science-paper-calculates-magnitude-of-plastic-waste-going-into-the-ocean -
Wisconsin scientists find genetic recipe to turn stem cells to blood
The ability to reliably and safely make in the laboratory all of the different types of cells in human blood is one key step closer to reality.
https://www.biyologlar.com/wisconsin-scientists-find-genetic-recipe-to-turn-stem-cells-to-blood -
Damaged DNA may stall patrolling molecule to initiate repair
Sites where DNA is damaged may cause a molecule that slides along the DNA strand to scan for damage to slow on its patrol, delaying it long enough to recognize and initiate repair. The finding suggests that the delay itself may be the key that allows the protein molecule to find its target, according to researchers at the University of Illinois at Chicago. Usually, the repair protein zips along quickly, says Anjum Ansari, UIC professor of physics and co-principal investigator on the study,...
https://www.biyologlar.com/damaged-dna-may-stall-patrolling-molecule-to-initiate-repair -
Scientists develop mesh that captures oil -- but lets water through
The unassuming piece of stainless steel mesh in a lab at The Ohio State University doesn't look like a very big deal, but it could make a big difference for future environmental cleanups. Water passes through the mesh but oil doesn't, thanks to a nearly invisible oil-repelling coating on its surface. In tests, researchers mixed water with oil and poured the mixture onto the mesh. The water filtered through the mesh to land in a beaker below. The oil collected on top of the mesh, and rolled...
https://www.biyologlar.com/scientists-develop-mesh-that-captures-oil-but-lets-water-through -
New brain mapping reveals unknown cell types
Using a process known as single cell sequencing, scientists at Karolinska Institutet have produced a detailed map of cortical cell types and the genes active within them. The study, which is published in the journal 'Science', marks the first time this method of analysis has been used on such a large scale on such complex tissue. The team studied over three thousand cells, one at a time, and even managed to identify a number of hitherto unknown types. "If you compare the brain to a fruit...
https://www.biyologlar.com/new-brain-mapping-reveals-unknown-cell-types -
Nano-walkers take speedy leap forward with first rolling DNA-based motor
Physical chemists have devised a rolling DNA-based motor that's 1,000 times faster than any other synthetic DNA motor, giving it potential for real-world applications, such as disease diagnostics. Nature Nanotechnology is publishing the finding. "Unlike other synthetic DNA-based motors, which use legs to 'walk' like tiny robots, ours is the first rolling DNA motor, making it far faster and more robust," says Khalid Salaita, the Emory University chemist who led the research. "It's like the...
https://www.biyologlar.com/nano-walkers-take-speedy-leap-forward-with-first-rolling-dna-based-motor -
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 -
New GTEx findings show how DNA differences influence gene activity, disease susceptibility
Researchers funded by the National Institutes of Health Genotype-Tissue Expression (GTEx) project have created a new and much-anticipated data resource to help establish how differences in an individual's genomic make-up can affect gene activity and contribute to disease. The new resource will enable scientists to examine the underlying genomics of many different human tissues and cells at the same time, and promises to open new avenues to the study and understanding of human biology. GTEx...
https://www.biyologlar.com/new-gtex-findings-show-how-dna-differences-influence-gene-activity-disease-susceptibility -
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 -
Brain scans show birds of a feather do flock together
The hottest hairstyle, the latest extreme sport, the newest viral stunt -- trends happen for a reason and now scientists have a better understanding of why. In a study using functional magnetic resonance imaging, Virginia Tech Carilion Research Institute scientists found that our inherent risk-taking preferences affect how we view and act on information from other people. The brain scans showed that study participants increased their perceived value of a gamble after seeing other people take...
https://www.biyologlar.com/brain-scans-show-birds-of-a-feather-do-flock-together -
Scientists 'watch' rats string memories together
By using electrode implants to track nerve cells firing in the brains of rats as they plan where to go next, Johns Hopkins scientists say they have learned that the mammalian brain likely reconstructs memories in a way more like jumping across stepping stones than walking across a bridge. A summary of their experiments, published in the journal Science on July 10, sheds light on what memories are and how they form, and gives clues about how the system can fail. "My own introspective experience...
https://www.biyologlar.com/scientists-watch-rats-string-memories-together -
Inside the Collections: Paleontology and Big Bone Room
Paleontology Collections Manager Carl Mehling gives us a behind-the-scenes tour of the Big Bone Room, which houses some of the largest items in the Paleontology collection. Its holdings include one of the largest complete limb bones in the world: the 650-pound thigh bone of the long-necked, plant-eating dinosaur Camarasaurus. More than 3 million specimens make up the Museum's world-class paleontology collections, and only a small fraction can be displayed at any given time. In fact,...
https://www.biyologlar.com/inside-the-collections-paleontology-and-big-bone-room -
A marine creature's magic trick explained
Tiny ocean creatures known as sea sapphires perform a sort of magic trick as they swim: One second they appear in splendid iridescent shades of blue, purple or green, and the next they may turn invisible (at least the blue ones turn completely transparent). How do they get their bright colors and what enables them to "disappear?" New research at the Weizmann Institute has solved the mystery of these colorful, vanishing creatures, which are known scientifically as Sapphirinidae. The findings,...
https://www.biyologlar.com/a-marine-creatures-magic-trick-explained -
T cells use 'handshakes' to sort friends from foes
T cells, the security guards of the immune system, use a kind of mechanical "handshake" to test whether a cell they encounter is a friend or foe, a new study finds.
https://www.biyologlar.com/t-cells-use-handshakes-to-sort-friends-from-foes -
T cells use 'handshakes' to sort friends from foes
T cells, the security guards of the immune system, use a kind of mechanical "handshake" to test whether a cell they encounter is a friend or foe, a new study finds.
https://www.biyologlar.com/t-cells-use-handshakes-to-sort-friends-from-foes -
A key protein is discovered as essential for malaria parasite transmission to mosquitos
Two teams have independently discovered that a single regulatory protein acts as the master genetic switch that triggers the development of male and female sexual forms (termed gametocytes) of the malaria parasite, solving a long-standing mystery in parasite biology with important implications for human health. The protein, AP2-G, is necessary for activating a set of genes that initiate the development of gametocytes -- the only forms that are infectious to mosquitos. The research also gives...
https://www.biyologlar.com/a-key-protein-is-discovered-as-essential-for-malaria-parasite-transmission-to-mosquitos -
Regional European Biomedical Laboratory Science Congress
On behalf of the Scientific and Organizing Committee, it gives me great pleasure, to invite you to the Regional European Biomedical Laboratory Science Congress, and the 4th Greek Medical Laboratory Technologists Conference, under the patronage of EPBS, which will be held in Athens, Greece on 5-8 December, 2013. Our primary goal is to develop the profession of Biomedical Scientists and emphasize our role in the health care system, where Biomedical laboratory Science plays an important role...
https://www.biyologlar.com/regional-european-biomedical-laboratory-science-congress -
Fruitful collaboration yields insight on the tomato genome
Plant biologist Julin Maloof met fellow researcher Neelima Sinha while beginning his career at the University of California, Davis. Both interested in plant morphology and natural variation,
https://www.biyologlar.com/fruitful-collaboration-yields-insight-on-the-tomato-genome -
Specialized life forms abound at Arctic methane seeps
This image shows chemosynthesis vs photosynthesis.
https://www.biyologlar.com/specialized-life-forms-abound-at-arctic-methane-seeps -
Specialized life forms abound at Arctic methane seeps
This image shows chemosynthesis vs photosynthesis.
https://www.biyologlar.com/specialized-life-forms-abound-at-arctic-methane-seeps -
Arctic gives clues on worst mass extinction of life
96 percent of marine species, and 70 percent of terrestrial life died off in the Permian-Triassic extinction event, as geologists know it. It is also known as The Great Dying Event for obvious reasons.
https://www.biyologlar.com/arctic-gives-clues-on-worst-mass-extinction-of-life -
'Big data' drills down into metabolic details
The same metabolic pathway can produce different results in different bodily tissues. A Rice University algorithm is designed to find those differences.
https://www.biyologlar.com/big-data-drills-down-into-metabolic-details -
'Big data' drills down into metabolic details
The same metabolic pathway can produce different results in different bodily tissues. A Rice University algorithm is designed to find those differences.
https://www.biyologlar.com/big-data-drills-down-into-metabolic-details -
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 -
Gene sequences reveal global variations in malaria parasites
Red blood cell stages of Plasmodium vivax from malaria patients in Thailand.
https://www.biyologlar.com/gene-sequences-reveal-global-variations-in-malaria-parasites -
Gene sequences reveal global variations in malaria parasites
Red blood cell stages of Plasmodium vivax from malaria patients in Thailand.
https://www.biyologlar.com/gene-sequences-reveal-global-variations-in-malaria-parasites -
Bakterilerde Toplumsal Bellek Olabilir
Geçmişe ilişkin bilgi anımsama becerisi karmaşık organizmalar için sıradandır. Bakteri gibi tek hücreli canlılarda ise bu yetenek hakkında neler söylenebileceği netleşmiş sayılmaz. ETH Zurich ve Eawag araştırmacılarından oluşan bir ekip, geçtiğimiz ay Proceedings of the National Academy of Sciences of the United States of America (PNAS) dergisinde yayımlanan bir makale ile sonuçlarını paylaştıkları çalışmalarında bu konuyu ele aldı.
https://www.biyologlar.com/bakterilerde-toplumsal-bellek-olabilir -
Modern insan yavrusuna Çin’den yeni kardeş: Xujiayao 1
Günümüzden 100.000 ila 224.000 yıl önce Doğu Asya’nın kimi bölgelerinde Homo erectus’lar, Homo antecessor’lar, Homo heidelbergensis’ler, Denisovalar, Neandertallar, arkaik Homo’lar ve olmazsa olmaz, modern Homo sapiens’ler, yani bizler, aynı coğrafyayı ve aynı zamanı paylaşmışız.
https://www.biyologlar.com/modern-insan-yavrusuna-cinden-yeni-kardes-xujiayao-1