Toplam 58 içerik listeleniyor
-
How the ant queen gets her crown: Uncovering the evolution of queen-worker differences
Queen and worker ants develop from the same sets of genes, but end up being structurally, behaviourally, and functionally different. Queen and worker ants develop from the same sets of genes, but perform completely different ecological roles. How the same genes result in two types of individuals is an ongoing mystery. In the past, scientists have only studied a small number of ant species at a time to try to understand the nature of queen-worker differences. However, a team from the Okinawa...
https://www.biyologlar.com/how-the-ant-queen-gets-her-crown-uncovering-the-evolution-of-queen-worker-differences-haber-8124 -
Function of mysterious RNAs may often lie in their genes
Scientists from Penn Medicine and other institutions unlock a mystery about 'long non-coding RNAs'. A new genetic clue discovered by a team co-led by a researcher at the Perelman School of Medicine at the University of Pennsylvania is shedding light on the functions of the mysterious "long non-coding RNAs" (lncRNAs). These molecules are transcribed from genes and are often abundant in cells, yet they do not code for proteins. Their functions have been almost entirely unknown--and in recent...
https://www.biyologlar.com/function-of-mysterious-rnas-may-often-lie-in-their-genes-haber-8132 -
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 -
Why some neurons 'outsource' their cell body
Nerve cells come in very different shapes. Researchers at the Bernstein Center Berlin now reveal why, in insects, the cell body is usually located at the end of a separate extension. Using mathematical models, they show that this increases the strength of electrical signal transmission at no additional energetic cost. Nerve cells follow a functional design: They receive input signals over more or less ramified cell branches (dendrites), which they forward to other nerve cells along an...
https://www.biyologlar.com/why-some-neurons-outsource-their-cell-body -
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 -
Scientists blueprint tiny cellular 'nanomachine'
Scientists have drawn up molecular blueprints of a tiny cellular 'nanomachine', whose evolution is an extraordinary feat of nature, by using one of the brightest X-ray sources on Earth. The scientists produced the structural map of this nanomachine - diacylglycerol kinase - by using a "hit and run" crystallography technique. In doing so, they have been able to understand how the tiny enzyme performs critical cellular duties - answering questions that have been on the table for over 50 years...
https://www.biyologlar.com/scientists-blueprint-tiny-cellular-nanomachine -
Scientists solve mystery behind earthworm digestion
Scientists have discovered how earthworms can digest plant material, such as fallen leaves, that would defeat most other herbivores. Earthworms are responsible for returning the carbon locked inside dead plant material back into the ground. They drag fallen leaves and other plant material down from the surface and eat them, enriching the soil, and they do this in spite of toxic chemicals produced by plants to deter herbivores. The scientists, led by Dr Jake Bundy and Dr Manuel Liebeke from...
https://www.biyologlar.com/scientists-solve-mystery-behind-earthworm-digestion -
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 -
Scientists discover protein's starring role in genome stability, and possibly cancer prevention
If you have a soft spot for unsung heroes, you'll love a DNA repair protein called XPG. Scientists from the U.S. Department of Energy's Lawrence Berkeley National Laboratory (Berkeley Lab) discovered that XPG plays a previously unknown and critical role helping to maintain genome stability in human cells. Their findings also raise the possibility that the protein helps prevent breast, ovarian, and other cancers associated with defective BRCA genes. The research, which is published online Jan....
https://www.biyologlar.com/scientists-discover-proteins-starring-role-in-genome-stability-and-possibly-cancer-prevention -
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 -
Some bacterial CRISPRs can snip RNA, too
You've probably seen news stories about the highly lauded, much-discussed genome editing system CRISPR/Cas9.
https://www.biyologlar.com/some-bacterial-crisprs-can-snip-rna-too -
Some bacterial CRISPRs can snip RNA, too
You've probably seen news stories about the highly lauded, much-discussed genome editing system CRISPR/Cas9.
https://www.biyologlar.com/some-bacterial-crisprs-can-snip-rna-too -
Unlocking the secrets of gene expression
Your DNA governs more than just what color your eyes are and whether you can curl your tongue.
https://www.biyologlar.com/unlocking-the-secrets-of-gene-expression -
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 -
'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 -
An enzyme enigma discovered in the abyss
Scientists at the Universities of Bristol and Newcastle have uncovered the secret of the 'Mona Lisa of chemical reactions' - in a bacterium that lives at the bottom of the Pacific Ocean.
https://www.biyologlar.com/an-enzyme-enigma-discovered-in-the-abyss -
An enzyme enigma discovered in the abyss
Scientists at the Universities of Bristol and Newcastle have uncovered the secret of the 'Mona Lisa of chemical reactions' - in a bacterium that lives at the bottom of the Pacific Ocean.
https://www.biyologlar.com/an-enzyme-enigma-discovered-in-the-abyss -
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 -
Fifty-four mouse testis-enriched genes are not needed for male fertility
Infertility affects about 15 percent of couples around the world. A couple's fertility depends on both the female's and male's ability to reproduce, which relies on thousands of genes working properly.
https://www.biyologlar.com/fifty-four-mouse-testis-enriched-genes-are-not-needed-for-male-fertility -
Fifty-four mouse testis-enriched genes are not needed for male fertility
Infertility affects about 15 percent of couples around the world. A couple's fertility depends on both the female's and male's ability to reproduce, which relies on thousands of genes working properly.
https://www.biyologlar.com/fifty-four-mouse-testis-enriched-genes-are-not-needed-for-male-fertility -
Scientific serendipity yields new neuron type in mouse retina
3-D reconstruction of a GluMI cell at the ultrastructural level showing its input (magenta puncta) and output (yellow puncta) obtained using serial block face scanning electron microscopy
https://www.biyologlar.com/scientific-serendipity-yields-new-neuron-type-in-mouse-retina -
Scientific serendipity yields new neuron type in mouse retina
3-D reconstruction of a GluMI cell at the ultrastructural level showing its input (magenta puncta) and output (yellow puncta) obtained using serial block face scanning electron microscopy
https://www.biyologlar.com/scientific-serendipity-yields-new-neuron-type-in-mouse-retina -
New fungi behind emerging wheat disease
Researchers have unraveled the mystery cause of the emerging wheat disease White Grain Disorder. Scientists at the Wheat Biosecurity Laboratory at The Australian National University (ANU) identified the cause of the disease when they isolated three previously undiscovered fungi from infected wheat samples and sequenced their genomes. "Until now, growers and pathologists have recognised the symptoms of White Grain Disorder, but they haven't known what causes it," said lead researcher Associate...
https://www.biyologlar.com/new-fungi-behind-emerging-wheat-disease -
A molecular alarm clock awakens resting ovules
Ovarian follicle of fruit fly, with chromosomes stained in green and dKDM5 protein stained in red.
https://www.biyologlar.com/a-molecular-alarm-clock-awakens-resting-ovules -
A molecular alarm clock awakens resting ovules
Ovarian follicle of fruit fly, with chromosomes stained in green and dKDM5 protein stained in red.
https://www.biyologlar.com/a-molecular-alarm-clock-awakens-resting-ovules -
Cracking the mystery of Zika virus replication
This is the structure of the ZIKV helicase in complex with RNA.
https://www.biyologlar.com/cracking-the-mystery-of-zika-virus-replication -
Cracking the mystery of Zika virus replication
This is the structure of the ZIKV helicase in complex with RNA.
https://www.biyologlar.com/cracking-the-mystery-of-zika-virus-replication -
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 -
First evidence of sleep in flight
Frigatebirds reaches a wingspan of over two metres. They are excellent gliders and can cover several hundred kilometers a day.
https://www.biyologlar.com/first-evidence-of-sleep-in-flight -
First evidence of sleep in flight
Frigatebirds reaches a wingspan of over two metres. They are excellent gliders and can cover several hundred kilometers a day.
https://www.biyologlar.com/first-evidence-of-sleep-in-flight -
How the ant queen gets her crown: Uncovering the evolution of queen-worker differences
Queen and worker ants develop from the same sets of genes, but end up being structurally, behaviourally, and functionally different.
https://www.biyologlar.com/how-the-ant-queen-gets-her-crown-uncovering-the-evolution-of-queen-worker-differences -
How the ant queen gets her crown: Uncovering the evolution of queen-worker differences
Queen and worker ants develop from the same sets of genes, but end up being structurally, behaviourally, and functionally different.
https://www.biyologlar.com/how-the-ant-queen-gets-her-crown-uncovering-the-evolution-of-queen-worker-differences -
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 -
Drew Berry: Animations of unseeable biology
We have no ways to directly observe molecules and what they do -- Drew Berry wants to change that. At TEDxSydney he shows his scientifically accurate (and entertaining!) animations that help researchers see unseeable processes within our own cells. TEDTalks is a daily video podcast of the best talks and performances from the TED Conference, where the world's leading thinkers and doers give the talk of their lives in 18 minutes. Featured speakers have included Al Gore on climate change,...
https://www.biyologlar.com/drew-berry-animations-of-unseeable-biology -
Böcekler Kuşlardan Farklı Yönde Kanat Çırpıyorlar
Böceklerin kanatlarını çırpması, birkaç istisna dışında, “aşağı-yukarı” yönlerde değil, “ön-arka” doğrultusundadır.( a.g.e.) Bu, gerçekten ilginç bir durumdur. Çünkü bu canlıların kanatlarını öne arkaya hareket ettirerek uçmaları bir başarıdır. Böcek kanatlarını öne doğru iterken kanadının üst yüzü yukarı bakar, kanadın arkaya hareketinde ise kanadın altı yukarıya bakmaktadır. Örneğin bilim adamları sineğin uçuşunun hayret verici...
https://www.biyologlar.com/bocekler-kuslardan-farkli-yonde-kanat-cirpiyorlar -
Kadın Orgazmının Evrimsel Kökeni
Memeliler yalnız canlılardan toplumsal varlıklara doğru geliştikçe, ovulasyon da daha otomatik bir hale gelmiş ve hem orgazm hem de klitoris üreme rollerini kaybetmiştir.
https://www.biyologlar.com/kadin-orgazminin-evrimsel-kokeni -
DNA Eşlenmesindeki Evrimsel Gizem: Eşlenme Yönü
Ters yönlü çalışan bir enzimin mekanizmasını inceleyen bilim insanları, DNA eşlenmesinin her zaman ileri yönde gerçekleşen bir biyolojik fenomen olduğu kanısına vardı.
https://www.biyologlar.com/dna-eslenmesindeki-evrimsel-gizem-eslenme-yonu -
Penguenler ile ilgili bazı harika gerçekler
Penguenler uçamayan 40 kuş türünden sadece bir tanesidir. Diğer türlere örnek olarak kivi, cassowary ve deve kuşu verilebilir. Güney yarımkürede daha fazla uçamayan kuş türü bulunmaktadır.
https://www.biyologlar.com/penguenler-ile-ilgili-bazi-harika-gercekler -
Portekiz Güvesinin Gizemi 22 Yıl Sonra Çözüldü
This is the male (left) and female (right) of the Portuguese mystery moth, Ekboarmia miniaria. Credit: Dr Pasi Sihvonen, CC-BY 4.0
https://www.biyologlar.com/portekiz-guvesinin-gizemi-22-yil-sonra-cozuldu -
Portekiz Güvesinin Gizemi 22 Yıl Sonra Çözüldü
This is the male (left) and female (right) of the Portuguese mystery moth, Ekboarmia miniaria. Credit: Dr Pasi Sihvonen, CC-BY 4.0
https://www.biyologlar.com/portekiz-guvesinin-gizemi-22-yil-sonra-cozuldu -
Antik İnsanlar Hakkında Neler Biliyoruz?
Geçtiğimiz haftalarda, Homo naledi türünün keşfedilen kafa tası üzerinden beyni hakkında çıkarımlar yapıldı, ayrıca Neandertallerin 130.000 yıl önce Amerika’nın ilk yerleşimcileri olabileceği ile ilgili önermeler ortaya atıldı.
https://www.biyologlar.com/antik-insanlar-hakkinda-neler-biliyoruz -
DNA organizasyonunun uzun süredir var olan biyolojik gizemi şimdi çözüldü!
Yeni bir teknik, kromatin boyalı bir metalle boyama ve elektron mikroskobuyla (EM) görüntülemeyle bir hücre çekirdeği (mor, sol alt) içinde kromatin yapısını ve organizasyonu 3-D görselleştirme sağladı.
https://www.biyologlar.com/dna-organizasyonunun-uzun-suredir-var-olan-biyolojik-gizemi-simdi-cozuldu -
DNA organizasyonunun uzun süredir var olan biyolojik gizemi şimdi çözüldü!
Yeni bir teknik, kromatin boyalı bir metalle boyama ve elektron mikroskobuyla (EM) görüntülemeyle bir hücre çekirdeği (mor, sol alt) içinde kromatin yapısını ve organizasyonu 3-D görselleştirme sağladı.
https://www.biyologlar.com/dna-organizasyonunun-uzun-suredir-var-olan-biyolojik-gizemi-simdi-cozuldu -
İlk Hayvanların Nasıl Ortaya Çıktığına Dair Gizem Çözülüyor mu?
Nature‘da yayımlanan bir araştırmada, Australian National University’den (ANU) bir grup bilim insanı tarafından, ilk hayvanların gezegenimizde nasıl ortaya çıktığına dair gizemin çözüldüğü iddia edildi. Görsel Telif: E. Burgess
https://www.biyologlar.com/ilk-hayvanlarin-nasil-ortaya-ciktigina-dair-gizem-cozuluyor-mu -
Flamingolar neden tek ayak üstünde durur ?
ABD'li bilim insanları, flamingoların tek ayakları üstünde durarak daha az enerji harcadığını açıkladı.
https://www.biyologlar.com/flamingolar-neden-tek-ayak-ustunde-durur- -
Flamingolar neden tek ayak üstünde durur ?
ABD'li bilim insanları, flamingoların tek ayakları üstünde durarak daha az enerji harcadığını açıkladı.
https://www.biyologlar.com/flamingolar-neden-tek-ayak-ustunde-durur- -
Hayvanlar ile İlgili Sorular ve Cevaplar
Bir gen mutasyonu, bazı kaplanların beyaz bir deriye sahip olmalarına neden olur. Credit: Iñaki Respaldiza/Getty Images
https://www.biyologlar.com/hayvanlar-ile-ilgili-sorular-ve-cevaplar