Toplam 33 içerik listeleniyor
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Pancreas stem cell discovery may lead to new diabetes treatments
Stem cells in the adult pancreas have been identified that can be turned into insulin producing cells, a finding that means people with type 1 diabetes might one day be able to regenerate their own insulin-producing cells. The discovery was made by scientists from the Walter and Eliza Hall Institute and provides further evidence that stem cells don't only occur in the embryo. The ability to produce the hormone insulin is crucial for controlling blood sugar (glucose) levels. In people with...
https://www.biyologlar.com/pancreas-stem-cell-discovery-may-lead-to-new-diabetes-treatments -
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 -
Scientists discover an on-off switch for aging cells
Scientists at the Salk Institute have discovered an on-and-off "switch" in cells that may hold the key to healthy aging. This switch points to a way to encourage healthy cells to keep dividing and generating, for example, new lung or liver tissue, even in old age. In our bodies, newly divided cells constantly replenish lungs, skin, liver and other organs. However, most human cells cannot divide indefinitely–with each division, a cellular timekeeper at the ends of chromosomes shortens. When...
https://www.biyologlar.com/scientists-discover-an-on-off-switch-for-aging-cells -
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 -
These gigantic whales have nerves like bungee cords
Nerves aren't known for being stretchy. In fact, "nerve stretch injury" is a common form of trauma in humans. But researchers reporting in
https://www.biyologlar.com/these-gigantic-whales-have-nerves-like-bungee-cords -
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 -
Zooming in on bacterial weapons in 3-D
The plague, bacterial dysentery, and cholera have one thing in common: These dangerous diseases are caused by bacteria which infect their host using a sophisticated injection apparatus. Through needle-like structures, they release molecular agents into their host cell, thereby evading the immune response. Researchers at the Max Planck Institute for Biophysical Chemistry in Göttingen in cooperation with colleagues at the Max Planck Institute for Infection Biology in Berlin and the University of...
https://www.biyologlar.com/zooming-in-on-bacterial-weapons-in-3-d -
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 -
Too much of a good thing: Extra genes make bacteria lethal
We, as most animals, host many different beneficial bacteria. Being beneficial to the host often pays off for the bacteria, as success of the host determines the survival and spread of the microbe. But if bacteria grow too much they may become deadly. In a new study published in the latest edition of the scientific journal PLOS Biology*, a research team from Instituto Gulbenkian de Ciencia (IGC; Portugal) found that a single genomic change can turn beneficial bacteria into pathogenic bacteria,...
https://www.biyologlar.com/too-much-of-a-good-thing-extra-genes-make-bacteria-lethal -
Shape-shifting molecule tricks viruses into mutating themselves to death
A newly developed spectroscopy method is helping to clarify the poorly understood molecular process by which an anti-HIV drug induces lethal mutations in the virus's genetic material. The findings from the University of Chicago and the Massachusetts Institute of Technology could bolster efforts to develop the next generation of anti-viral treatments. Viruses can mutate rapidly in order to adapt to environmental pressure. This feature also helps them become resistant to anti-viral drugs. But...
https://www.biyologlar.com/shape-shifting-molecule-tricks-viruses-into-mutating-themselves-to-death -
The first long-horned beetle giving birth to live young discovered in Borneo
A remarkably high diversity of the wingless long-horned beetles in the mountains of northern Borneo is reported by three Czech researchers from the Palacký University, Olomouc, Czech Republic. Apart from the genera and species new to science, the entomologists report the first case of reproduction by live birth in this rarely collected group of beetles. Generally, insects are oviparous, which means that their females lay eggs and the embryonic development occurs outside the female's body. On...
https://www.biyologlar.com/the-first-long-horned-beetle-giving-birth-to-live-young-discovered-in-borneo -
The first long-horned beetle giving birth to live young discovered in Borneo
A remarkably high diversity of the wingless long-horned beetles in the mountains of northern Borneo is reported by three Czech researchers from the Palacký University, Olomouc, Czech Republic. Apart from the genera and species new to science, the entomologists report the first case of reproduction by live birth in this rarely collected group of beetles. Generally, insects are oviparous, which means that their females lay eggs and the embryonic development occurs outside the female's body. On...
https://www.biyologlar.com/the-first-long-horned-beetle-giving-birth-to-live-young-discovered-in-borneo -
Intestinal worms 'talk' to gut bacteria to boost immune system
EPFL researchers have discovered how intestinal worm infections cross-talk with gut bacteria to help the immune system. Intestinal worms infect over 2 billion people across the world, mostly children, in areas with poor sanitation. But despite causing serious health problems, worms can actually help the immune system of its host as an indirect way of protecting themselves. The evidence for this is so strong that we are now testing worms for clinical benefits. However, very little is known...
https://www.biyologlar.com/intestinal-worms-talk-to-gut-bacteria-to-boost-immune-system -
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 -
Red clover genome to help restore sustainable farming
Six red clover varieties with diverse architectures and traits have recently been selected as parents of the next year generation.
https://www.biyologlar.com/red-clover-genome-to-help-restore-sustainable-farming -
Red clover genome to help restore sustainable farming
Six red clover varieties with diverse architectures and traits have recently been selected as parents of the next year generation.
https://www.biyologlar.com/red-clover-genome-to-help-restore-sustainable-farming -
Genome 10K -- Vertebrate 'genomic zoo' to help protect our planet
This image shows a range of vertebrate the G10K members are working on: Bird - Ruby-throated Hummingbird; Reptile - Green Anole; Fish - Spotted Gar; Mammal - Koala
https://www.biyologlar.com/genome-10k-vertebrate-genomic-zoo-to-help-protect-our-planet -
Genome 10K -- Vertebrate 'genomic zoo' to help protect our planet
This image shows a range of vertebrate the G10K members are working on: Bird - Ruby-throated Hummingbird; Reptile - Green Anole; Fish - Spotted Gar; Mammal - Koala
https://www.biyologlar.com/genome-10k-vertebrate-genomic-zoo-to-help-protect-our-planet -
Gen Haritalaması Haritalar Nasıl Oluşturuluyor, Neler İçeriyor, Nasıl Yorumlanıyor?
Gen haritalaması, genlerin kromozomlar üzerinde bulunduğu yerlerin (lokus) gösterilmesidir. Böylece insan genomunun anatomisi ortaya çıkarılır. Pekçok genin ve diğer genetik marker`larin birbirlerine göre bir kromozom boyunca diziliş sırasının haritalanmasıyla bir kromozomun haritasını veya tüm genom haritasını çıkarmak mümkündür. Bu haritalama, insan vücudu fonksiyonlarının bilinmesi için gereklidir. Böylece insan genetik hastalıklarının heterojenite ve...
https://www.biyologlar.com/gen-haritalamasi-haritalar-nasil-olusturuluyor-neler-iceriyor-nasil-yorumlaniyor -
Patates Böceği İle Mücadelede RNAi Teknolojisi
“Uluslararası Süper Haşere” lakabına sahip, ülkemizde bilinen adıyla patates böceği her yıl dünya genelinde tarım sektörüne bir hayli pahalıya mal olmaktadır. Pek çok ilaca karşı dirençli ve pek az doğal düşmanı olması nedeniyle bilim insanları bu böcek ile mücadelede oldukça yoğun çalışmaktadır.Şubat ayında Science dergisinde yayınlanan bir çalışma ile (Science 2015, DOI: 10.1126/science.1261680) patates böceğiyle mücadelede yeni bir yöntemin...
https://www.biyologlar.com/patates-bocegi-ile-mucadelede-rnai-teknolojisi -
Restriksiyon enzimi veya estriksiyon endonükleazı hakkında bilgi
Restriksiyon enzimi veya restriksiyon endonükleazı çift zincirli DNA moleküllerindeki belli nükleotit dizilerini tanıyan ve her iki zinciri birlikte kesen bir enzim türüdür.
https://www.biyologlar.com/restriksiyon-enzimi-veya-estriksiyon-endonukleazi-hakkinda-bilgi -
Bilim İnsanları Seksin Gelecek Nesillerin Enfeksiyonla Savaşmasına Yardım Etmek İçin Geliştiğini Gösterdi
Bilim insanları, araştırmanın bir parçası olarak su piresi türü olan 6.000 Daphnia'yı inceledi. Credit: University of Stirling
https://www.biyologlar.com/bilim-insanlari-seksin-gelecek-nesillerin-enfeksiyonla-savasmasina-yardim-etmek-icin-gelistigini-gosterdi -
Bilim İnsanları Seksin Gelecek Nesillerin Enfeksiyonla Savaşmasına Yardım Etmek İçin Geliştiğini Gösterdi
Bilim insanları, araştırmanın bir parçası olarak su piresi türü olan 6.000 Daphnia'yı inceledi. Credit: University of Stirling
https://www.biyologlar.com/bilim-insanlari-seksin-gelecek-nesillerin-enfeksiyonla-savasmasina-yardim-etmek-icin-gelistigini-gosterdi -
Tehlike altındaki siyah gergedanları kurtarmak için yeni bir stratejiye ihtiyacımız var.
Bugün vahşi doğada az sayıda 5.000 siyah gergedan var. (Fotoğraf: Emmy Geary / Shutterstock)
https://www.biyologlar.com/tehlikedeki-altindaki-siyah-gergedanlari-kurtarmak-icin-yeni-bir-stratejiye-ihtiyacimiz-var- -
Tehlike altındaki siyah gergedanları kurtarmak için yeni bir stratejiye ihtiyacımız var.
Bugün vahşi doğada az sayıda 5.000 siyah gergedan var. (Fotoğraf: Emmy Geary / Shutterstock)
https://www.biyologlar.com/tehlikedeki-altindaki-siyah-gergedanlari-kurtarmak-icin-yeni-bir-stratejiye-ihtiyacimiz-var- -
Gen teknolojisinde devrim gibi gelişme! DNA’ya işletim sistemi ve virüs yüklendi
Yeni geliştirilen kodlama sistemi, DNA moleküllerinin veri depolama kapasitesini en üst düzeye çıkarıyor.
https://www.biyologlar.com/gen-teknolojisinde-devrim-gibi-gelisme-dnaya-isletim-sistemi-ve-virus-yuklendi -
Bölgecilik ve Saldırganlık
Çekişme hayvanlar aleminde her zaman karşılaşılan bir durumdur. Bazı durumlarda bu çekişme şiddet, yaralanma ve ölümle sonuçlanmakta ancak birçok durumda da bu çekişmeler vücut pozisyonu veya güç gösterileriyle çözülebilmektedir.
https://www.biyologlar.com/bolgecilik-ve-saldirganlik -
Biyolojik Çeşitlilik Nedir ?
Biyolojik çeşitlilik, Birleşmiş Milletler tarafından 1992 yılında düzenlenen Rio Konferansı’nın önemli gündem maddelerinden biri olmuştur. “Biyoçeşitliliğin Korunması” ile ilgili sözleşmeyi, Türkiye dahil 150’den fazla ülke imzalamıştır. Aynı yıl içinde “Küresel Biyoçeşitlilik Eylem Planı” (Global Biodiversity Strategy) hazırlanıp yayınlanmıştır. Bu eylem planında ana amaç, “ Yeryüzündeki her canlı türünün, bu türlerin her birinin...
https://www.biyologlar.com/biyolojik-cesitlilik-1 -
Hayvan Çiftleşmesinin En Garip 8 Örneği
Sadece seks düşüncesinin bile heyecan verici olduğu, insan doğasının bilinen bir gerçeğidir. Pek çoğumuz, boş zamanının önemli bir kısmını seks yaparak veya seks yapmayı düşünmekle geçirir. Görsel Telif: Dr. Phill Watts
https://www.biyologlar.com/hayvan-ciftlesmesinin-en-garip-8-ornegi -
Genetik kanalizasyon nedir ?
Genetik kanalizasyon, yaşadıkları çevrenin değişebilirliği veya sahip oldukları genotipin değişkenliği ne ölçüde olursa olsun, bir popülasyonun aynı fenotipi üretebilme yeteneğinin bir ölçüsüdür. Diğer bir deyişle "dayanıklılık" veya "performans" anlamına gelir ve popülasyonun sağlamlığını ifade eder. Genetik kanalizasyon terimi ilk defa Conrad Hal Waddington tarafından kullanılmıştır.[1] Wassington bu terimi, daha ziyade popülasyonun...
https://www.biyologlar.com/genetik-kanalizasyon-nedir- -
Tat hücreleri hayvanın yiyecek arama stratejisini nasıl kontrol edebilir?
Sinirbilimciler, Nematod solucanının nasıl yiyecek aradığını açıklamak için yeni bir bilgisayar modeli geliştirdiler ve tek beyin hücrelerinin hem çevreyi algılayabildiğini hem de bütün bir hayvanın yiyecek arama stratejisini kontrol edebildiğini ortaya çıkardı.
https://www.biyologlar.com/tat-hucreleri-hayvanin-yiyecek-arama-stratejisini-nasil-kontrol-edebilir