Toplam 15 içerik listeleniyor
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Stem-cell-based strategy boosts immune system in mice
Raising hopes for cell-based therapies, UC San Francisco researchers have created the first functioning human thymus tissue from embryonic stem cells in the laboratory. The researchers showed that, in mice, the tissue can be used to foster the development of white blood cells the body needs to mount healthy immune responses and to prevent harmful autoimmune reactions. The scientists who developed the thymus cells — which caused the proliferation and maturation of functioning immune cells...
https://www.biyologlar.com/stem-cell-based-strategy-boosts-immune-system-in-mice -
Oncogene controls stem cells in early embryonic development
After a gestation period of around ten months, fawns are born in early summer - when the weather is warm and food is plentiful for the mother. Six months would actually be enough for the embryo's development, but then offspring from mating in the later portion of summer would be born in winter. Therefore, nature prolongs the gestation period by a hormone-regulated pause in the development of the early embryos. Many animal species use this process, called diapause, to adjust their reproduction...
https://www.biyologlar.com/oncogene-controls-stem-cells-in-early-embryonic-development -
On the trail of the clever snail
Animals, like humans, excel at some tasks but not others according to a new study published in the journal Scientific Reports. Researchers from the Universities of Exeter and Aberystwyth used pond snails to investigate learning and memory. They found that if an individual is good at forming memories about food they are poor at forming memories related to predator threat and vice versa. Dr Sasha Dall from the Centre for Ecology and Conservation at the University of Exeter's Penryn Campus in...
https://www.biyologlar.com/on-the-trail-of-the-clever-snail -
New DNA research reveals genetic heritage of elusive vaquita
A new method of teasing information from scarce and highly degraded genetic samples is helping NOAA Fisheries and Mexican scientists unravel the genetic heritage of the enigmatic vaquita, the most endangered marine mammal on Earth. Genetic studies are important to the international effort to conserve the vaquita because the DNA that holds their genetic code can unlock the secrets of how they came to be. For instance, it can reveal the story of how - and how long ago - the animals evolved into...
https://www.biyologlar.com/new-dna-research-reveals-genetic-heritage-of-elusive-vaquita -
New DNA research reveals genetic heritage of elusive vaquita
A new method of teasing information from scarce and highly degraded genetic samples is helping NOAA Fisheries and Mexican scientists unravel the genetic heritage of the enigmatic vaquita, the most endangered marine mammal on Earth. Genetic studies are important to the international effort to conserve the vaquita because the DNA that holds their genetic code can unlock the secrets of how they came to be. For instance, it can reveal the story of how - and how long ago - the animals evolved into...
https://www.biyologlar.com/new-dna-research-reveals-genetic-heritage-of-elusive-vaquita -
'Tree of life' for 2.3 million species released
A first draft of the "tree of life" for the roughly 2.3 million named species of animals, plants, fungi and microbes -- from platypuses to puffballs -- has been released. A collaborative effort among eleven institutions, the tree depicts the relationships among living things as they diverged from one another over time, tracing back to the beginning of life on Earth more than 3.5 billion years ago. Tens of thousands of smaller trees have been published over the years for select branches of the...
https://www.biyologlar.com/tree-of-life-for-2-3-million-species-released -
Scientists capture the elusive structure of essential digestive enzyme
Stylized graphic of SEC-SAXS data (with cyan cross-section showing the elution profile and magenta cross-section showing scattering profile) and the structure of the activated phenylalanine hydroxylase
https://www.biyologlar.com/scientists-capture-the-elusive-structure-of-essential-digestive-enzyme -
Scientists capture the elusive structure of essential digestive enzyme
Stylized graphic of SEC-SAXS data (with cyan cross-section showing the elution profile and magenta cross-section showing scattering profile) and the structure of the activated phenylalanine hydroxylase
https://www.biyologlar.com/scientists-capture-the-elusive-structure-of-essential-digestive-enzyme -
Biological 'clock' discovered in sea turtle shells
Radiocarbon dating of atomic bomb fallout found in sea turtle shells can be used to reliably estimate the ages, growth rates and reproductive maturity of sea turtle populations in the wild, a new study led by Duke University and NOAA researchers finds. The technique provides more accurate estimates than other methods scientists currently use and may help shed new light on factors influencing the decline and lack of recovery of some endangered sea turtles populations. "The most basic questions...
https://www.biyologlar.com/biological-clock-discovered-in-sea-turtle-shells -
Giraffes more speciose than expected
Scientists from the Senckenberg and the Giraffe Conservation Foundation have analysed the genetic relationships of all major populations of giraffe in the wild.
https://www.biyologlar.com/giraffes-more-speciose-than-expected -
Filler (Elephantidae)
Fil, hortumlular takımının filgiller (Elephantidae) familyasını oluşturan memeli bir hayvandır. Geleneksel olarak Asya fili (Elephas maximus) ve Afrika fili (Loxodonta africana) olmak üzere iki türü tanınır;
https://www.biyologlar.com/filler-elephantidae -
Filler (Elephantidae)
Fil, hortumlular takımının filgiller (Elephantidae) familyasını oluşturan memeli bir hayvandır. Geleneksel olarak Asya fili (Elephas maximus) ve Afrika fili (Loxodonta africana) olmak üzere iki türü tanınır;
https://www.biyologlar.com/filler-elephantidae -
Tuhaf Çene Yapılarına Sahip Köpekbalıkları Tayvan Sahillerine Geri Dönüyor.
Tayvan'da yeni yakalanan nadiren görülen engerek köpekbalıkları dalgalanmalara neden oluyor: Fotoğraf: (Fisheries Research Institute)
https://www.biyologlar.com/tuhaf-cene-yapilarina-sahip-kopekbaliklari-tayvan-sahillerine-geri-donuyor- -
Tuhaf Çene Yapılarına Sahip Köpekbalıkları Tayvan Sahillerine Geri Dönüyor.
Tayvan'da yeni yakalanan nadiren görülen engerek köpekbalıkları dalgalanmalara neden oluyor: Fotoğraf: (Fisheries Research Institute)
https://www.biyologlar.com/tuhaf-cene-yapilarina-sahip-kopekbaliklari-tayvan-sahillerine-geri-donuyor- -
Sperm hücrelerinin yumurta hücrelerine çekilmesini sağlayan mekanizma keşfedildi
Marine Biyolojisi Laboratuvarı’nda çalışma yürüten bilim insanları tarafından yapılan çalışmayla, sperm ve yumurta hücrelerinin zigotu var etmek için birleşmelerini sağlayacak çekimin nasıl sağlandığı ortaya çıkarıldı.
https://www.biyologlar.com/sperm-hucrelerinin-yumurta-hucrelerine-cekilmesini-saglayan-mekanizma-kesfedildi