Toplam 50 içerik listeleniyor
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22 . Kromozom
İnsanlar normalde her hücrede 23 çifte bölünmüş 46 kromozoma sahiptir. Her ebeveynden miras alınan bir kopya olmak üzere 22 numaralı kromozomun iki kopyası, çiftlerden birini oluşturur. İnsan genomunda toplamda 23, otozom olarak 22 adet bulunan kromozom çiftlerinden biridir. Normal insan genomundaki tüm otozomlar için geçerli olduğu gibi, kromozom 22 de iki kopya halinde bulunur. İkinci en küçük insan kromozomu olan 22. kromozom , yaklaşık 49 milyon baz çiftiyle,...
https://www.biyologlar.com/22-kromozom -
Scientists discover how 'jumping genes' help black truffles adapt to their environment
Black truffles, also known as Périgord truffles, grow in symbiosis with the roots of oak and hazelnut trees. In the world of haute cuisine, they are expensive and highly prized. In the world of epigenetics, however, the fungi (Tuber melanosporum) are of major interest for another reason: their unique pattern of DNA methylation, a biochemical process that chemically modifies nucleic acids without changing their sequence. Epigenetics is the study of changes in gene expression caused by...
https://www.biyologlar.com/scientists-discover-how-jumping-genes-help-black-truffles-adapt-to-their-environment -
Simple technology makes CRISPR gene editing cheaper
University of California, Berkeley, researchers have discovered a much cheaper and easier way to target a hot new gene editing tool, CRISPR-Cas9, to cut or label DNA. The CRISPR-Cas9 technique, invented three years ago at UC Berkeley, has taken genomics by storm, with its ability to latch on to a very specific sequence of DNA and cut it, inactivating genes with ease. This has great promise for targeted gene therapy to cure genetic diseases, and for discovering the causes of disease. The...
https://www.biyologlar.com/simple-technology-makes-crispr-gene-editing-cheaper -
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 -
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 -
Genome-wide search reveals new genes involved in long-term memory
A new study has identified genes involved in long-term memory in the worm as part of research aimed at finding ways to retain cognitive abilities during aging. The study, which was published in the journal Neuron, identified more than 750 genes involved in long-term memory, including many that had not been found previously and that could serve as targets for future research, said senior author Coleen Murphy, an associate professor of molecular biology and the Lewis-Sigler Institute for...
https://www.biyologlar.com/genome-wide-search-reveals-new-genes-involved-in-long-term-memory -
Broad, MIT scientists overcome key CRISPR-Cas9 genome editing hurdle
Researchers at the Broad Institute of MIT and Harvard and the McGovern Institute for Brain Research at MIT have engineered changes to the revolutionary CRISPR-Cas9 genome editing system that significantly cut down on "off-target" editing errors. The refined technique addresses one of the major technical issues in the use of genome editing. The CRISPR-Cas9 system works by making a precisely targeted modification in a cell's DNA. The protein Cas9 alters the DNA at a location that is specified by...
https://www.biyologlar.com/broad-mit-scientists-overcome-key-crispr-cas9-genome-editing-hurdle -
Novel stem cell line avoids risk of introducing transplanted tumors
Human pluripotent stem cells (hPSC) can become any type of cell in the adult body, offering great potential in disease modeling, drug discovery and creating replacement cells for conditions ranging from cardiovascular to Alzheimer's disease. But that promise comes with a risk: the possibility that transplanted hPSCs might also develop as unwanted tumors. In a new study published November 10, 2015 in the online journal eLIFE, researchers at University of California, San Diego School of Medicine...
https://www.biyologlar.com/novel-stem-cell-line-avoids-risk-of-introducing-transplanted-tumors -
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 -
Forensic botany uses plant DNA to trace crimes
Sam Houston State University is advancing the field of forensic botany with the publication of two recent studies that use marijuana DNA to link drug supplies and pollen DNA to aid in forensic investigations. In an article published in the International Journal of Legal Medicine, faculty and students from the Department of Forensic Science report that they developed a test to individualize samples of marijuana that could be used to link drugs across cases. The study examined 11 cases...
https://www.biyologlar.com/forensic-botany-uses-plant-dna-to-trace-crimes -
New way to harvest stem cells better for donors
Australian scientists have developed a new method for harvesting stem cells, which is less invasive and reduces side effects for donors.
https://www.biyologlar.com/new-way-to-harvest-stem-cells-better-for-donors -
Watching the luminescent gene switch
The system consists of two newly developed programs that automatically identify the 3-D positions of target areas based on the signals from the scintillators (shown as white dots), and determine...
https://www.biyologlar.com/watching-the-luminescent-gene-switch -
Watching the luminescent gene switch
The system consists of two newly developed programs that automatically identify the 3-D positions of target areas based on the signals from the scintillators (shown as white dots), and determine...
https://www.biyologlar.com/watching-the-luminescent-gene-switch -
Four newly identified genes could improve rice
The GWAS results for genes that influence flowering dates. The known genes Hd1, Hd2, and Hd6 were located, together with two newly-identified genes that also affect flowering dates.
https://www.biyologlar.com/four-newly-identified-genes-could-improve-rice -
Four newly identified genes could improve rice
The GWAS results for genes that influence flowering dates. The known genes Hd1, Hd2, and Hd6 were located, together with two newly-identified genes that also affect flowering dates.
https://www.biyologlar.com/four-newly-identified-genes-could-improve-rice -
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 -
'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 -
Newly discovered fossil sea urchin is the oldest of its kind
Researchers have uncovered a fossil sea urchin that pushes back a fork in its family tree by 10 million years, according to a new study.
https://www.biyologlar.com/newly-discovered-fossil-sea-urchin-is-the-oldest-of-its-kind -
3-D motion of cold virus offers hope for improved drugs using Australia's fastest supercomputer
Melbourne researchers are now simulating in 3D, the motion of the complete human rhinovirus, the most frequent cause of the common cold, on Australia's fastest supercomputer, paving the way for new drug development. Rhinovirus infection is linked to about 70 per cent of all asthma exacerbations with more than 50 per cent of these patients requiring hospitalisation. Furthermore, over 35 per cent of patients with acute chronic obstructive pulmonary disease (COPD) are hospitalised each year due...
https://www.biyologlar.com/3-d-motion-of-cold-virus-offers-hope-for-improved-drugs-using-australias-fastest-supercomputer -
Scientists report world's first herbivorous filter-feeding marine reptile
Some strange creatures cropped up in the wake of one of Earth's biggest mass extinctions 252 million years ago. In 2014, scientists discovered a bizarre fossil--a crocodile-sized sea-dwelling reptile,
https://www.biyologlar.com/scientists-report-worlds-first-herbivorous-filter-feeding-marine-reptile -
Scientists report world's first herbivorous filter-feeding marine reptile
Some strange creatures cropped up in the wake of one of Earth's biggest mass extinctions 252 million years ago. In 2014, scientists discovered a bizarre fossil--a crocodile-sized sea-dwelling reptile,
https://www.biyologlar.com/scientists-report-worlds-first-herbivorous-filter-feeding-marine-reptile -
How mold on space station flowers is helping get us to Mars
When Scott Kelly tweeted a picture of moldy leaves on the current crop of zinnia flowers aboard the International Space Station, it could have looked like the science was doomed.
https://www.biyologlar.com/how-mold-on-space-station-flowers-is-helping-get-us-to-mars -
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 -
Bacteria take 'RNA mug shots' of threatening viruses
Scientists from The University of Texas at Austin, the Stanford University School of Medicine and two other institutions have discovered that bacteria have a system that can recognize and disrupt dangerous
https://www.biyologlar.com/bacteria-take-rna-mug-shots-of-threatening-viruses -
New genus of bacteria found living inside hydraulic fracturing wells
Ohio State University researchers and their colleagues have identified a new genus of bacteria living inside hydraulic fracturing wells.
https://www.biyologlar.com/new-genus-of-bacteria-found-living-inside-hydraulic-fracturing-wells -
New genus of bacteria found living inside hydraulic fracturing wells
Ohio State University researchers and their colleagues have identified a new genus of bacteria living inside hydraulic fracturing wells.
https://www.biyologlar.com/new-genus-of-bacteria-found-living-inside-hydraulic-fracturing-wells -
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 -
The corn snake genome sequenced for the first time
Wild-type corn snakes typically exhibit, over a light orange background coloration, a pattern of dark orange dorsal saddles and lateral blotches that are outlined with black
https://www.biyologlar.com/the-corn-snake-genome-sequenced-for-the-first-time -
In the ocean, clever camouflage beats super sight
Squinting won't help you spot the fish in this photo. These snub-nosed darts blend seamlessly into their watery surroundings with help from their silvery reflective skin.
https://www.biyologlar.com/in-the-ocean-clever-camouflage-beats-super-sight -
In the ocean, clever camouflage beats super sight
Squinting won't help you spot the fish in this photo. These snub-nosed darts blend seamlessly into their watery surroundings with help from their silvery reflective skin.
https://www.biyologlar.com/in-the-ocean-clever-camouflage-beats-super-sight -
FIRSATÇI ENFEKSİYONLAR
Fırsatçı bir enfeksiyon enfeksiyon patojen haline gelmiştir normalde benign mikroorganizma neden olmaktadır. Fırsatçı enfeksiyonlar gibi organizmaların devralmaya ve yaygın bir enfeksiyona neden izin başkaları bağışıklık sistemi olan kişilerde görülür. Bağışıklık sistemini defne onları tutmak çünkü sağlıklı bir bağışıklık sistemi olan bireylerin, bu organizmaların enfeksiyon neden noktasına yaymak için, izin vermem. insanların bir dizi fırsatçı...
https://www.biyologlar.com/firsatci-enfeksiyonlar -
Fırsatçı enfeksiyon tanımını yapınız ve sık görülen fırsatçı fungal enfeksiyon etkenleri hakkında kısaca bilgi veriniz.
Fırsatçı enfeksiyon nedir? özellikle fırsatçı patojenlerin neden olduğu enfeksiyonlardır. Genellikle sağlıklı bir konak, sağlıklı bir bağışıklık sistemi ile bu hastalıklardan korunmaktadır ancak yetersiz bağışıklık sistemi durumlarında bakteriyel, viral, mantarlara bağlı ya da protozoal enfeksiyonlar bu durmundan yararlanarak enfeksiyon oluştururlar. Bağışıklık sistemi yetersizliği bu patojenlere hastalık oluşturmak için bir "fırsat"...
https://www.biyologlar.com/firsatci-enfeksiyon-tanimini-yapiniz-ve-sik-gorulen-firsatci-fungal-enfeksiyon-etkenleri-hakkinda-kisaca-bilgi-veriniz- -
4 Milyar Yıl Önceki ‘RNA Dünyası’ Yeniden Canlandırıldı
Yaşamın temel hususlarından birisi, kendini eşleyebilme özünden çıkan üreme ve üreyebilme özelliğidir.
https://www.biyologlar.com/4-milyar-yil-onceki-rna-dunyasi-yeniden-canlandirildi -
Baz İstasyonları ve Olası Zararları Üzerine Genel Bir Değerlendirme
Bugünlerde toplumumuzun en ciddi sorunlarından birisi de şehirleşmenin beraberinde getirdiği sağlık sorunları. Bunların başlıca önem arz edenlerinden birisi de baz istasyonlarının sağlığımız üzerine etkisi.
https://www.biyologlar.com/baz-istasyonlari-ve-olasi-zararlari-uzerine-genel-bir-degerlendirme -
Darwin ve Doğal Seleksiyon
19. yüzyılda Avrupa ve Amerika'da eğitimli birçok insan, Charles Darwin'in yazılarıyla evrim kavramına ilk kez tam olarak karşılaştıklarında, bu ismi telaffuz etmek için bu simgeye tıkladılar. Açıkçası, Darwin bu fikri icat etmedi.
https://www.biyologlar.com/darwin-ve-dogal-seleksiyon -
Darwin ve Doğal Seleksiyon
19. yüzyılda Avrupa ve Amerika'da eğitimli birçok insan, Charles Darwin'in yazılarıyla evrim kavramına ilk kez tam olarak karşılaştıklarında, bu ismi telaffuz etmek için bu simgeye tıkladılar. Açıkçası, Darwin bu fikri icat etmedi.
https://www.biyologlar.com/darwin-ve-dogal-seleksiyon -
Darwin ve Doğal Seleksiyon
19. yüzyılda Avrupa ve Amerika'da eğitimli birçok insan, Charles Darwin'in yazılarıyla evrim kavramına ilk kez tam olarak karşılaştıklarında, bu ismi telaffuz etmek için bu simgeye tıkladılar. Açıkçası, Darwin bu fikri icat etmedi.
https://www.biyologlar.com/darwin-ve-dogal-seleksiyon -
Darwin ve Doğal Seleksiyon
19. yüzyılda Avrupa ve Amerika'da eğitimli birçok insan, Charles Darwin'in yazılarıyla evrim kavramına ilk kez tam olarak karşılaştıklarında, bu ismi telaffuz etmek için bu simgeye tıkladılar. Açıkçası, Darwin bu fikri icat etmedi.
https://www.biyologlar.com/darwin-ve-dogal-seleksiyon -
Kurbağa Derisi Üzerinde Virüsidal Sıvı Keşfedildi
Antimikrobiyal çalışmaları yapan bilim insanları, Güney Hindistan kurbağasının derisi üzerinde salgılanan sümüksü sıvıyı çalışırken umduklarından daha da umut verici bir sonuca ulaştılar. CREDIT-Sanil-George-Jessica-Shartouny
https://www.biyologlar.com/kurbaga-derisi-uzerinde-virusidal-sivi-kesfedildi -
Kurbağa Derisi Üzerinde Virüsidal Sıvı Keşfedildi
Antimikrobiyal çalışmaları yapan bilim insanları, Güney Hindistan kurbağasının derisi üzerinde salgılanan sümüksü sıvıyı çalışırken umduklarından daha da umut verici bir sonuca ulaştılar. CREDIT-Sanil-George-Jessica-Shartouny
https://www.biyologlar.com/kurbaga-derisi-uzerinde-virusidal-sivi-kesfedildi -
İlk organizmalarda yeni keşfedilen protein
Dünyadaki yaşam, organik karbon oluşturmak için fotosentetik karbondioksit (CO2) fiksasyonuna bağlıdır.
https://www.biyologlar.com/ilk-organizmalarda-yeni-kesfedilen-protein -
İlk organizmalarda yeni keşfedilen protein
Dünyadaki yaşam, organik karbon oluşturmak için fotosentetik karbondioksit (CO2) fiksasyonuna bağlıdır.
https://www.biyologlar.com/ilk-organizmalarda-yeni-kesfedilen-protein -
İlk organizmalarda yeni keşfedilen protein
Dünyadaki yaşam, organik karbon oluşturmak için fotosentetik karbondioksit (CO2) fiksasyonuna bağlıdır.
https://www.biyologlar.com/ilk-organizmalarda-yeni-kesfedilen-protein -
Yeni Dev Virüsler, Canlılığın Tanımını Daha da Bulanıklaştırıyor
Yeni bulunan iki dev virüs, virüslerin kökenleri hakkındaki tartışmayı yeniden gündeme getirdi. Onlarca yıldır virüslerin tanımı, canlı ile cansız arasında kaldı. Görsel Telif; Microscopy Center of UFMG, Brazil
https://www.biyologlar.com/yeni-dev-virusler-canliligin-tanimini-daha-da-bulaniklastiriyor -
Bazı dinozorlar neden çok büyük?
Bu, Sarahsaurus aurifontanalis'in neredeyse tam bir iskeleti; tek önemli eksik parça kafatası. Paleontolog Adam Marsh bu iskeleti ve bir diğerini Sarahsaurus'un anatomisini tanımlamak için kullandı. – Jackson Dünya Tarihi Tarih Omurgalı Paleontoloji Koleksiyonları Okul Müzesi / Austin, Teksas Üniversitesi.
https://www.biyologlar.com/bazi-dinozorlar-neden-cok-buyuk -
Yeni Koronavirüs Salgını: Virüsün Kökeni, Belirtiler ve Korunma Yolları
Çin'de ortaya çıkan salgının çok hızlı yayılması, küresel çapta endişelerin de artmasına yol açtı. Yeni ve ölümcül olan bu virüsle ilgili şu ana kadar bildiklerimiz ise oldukça sınırlı düzeyde SARS benzeri yeni bir virüsün sebep olduğu salgın sebebiyle Çin’de şu ana kadar 17 kişi hayatını kaybederken; virüse enfekte –şimdilik– yaklaşık 584’ten fazla insan da gözetim altında tutuluyor.
https://www.biyologlar.com/yeni-koronavirus-salgini-virusun-kokeni-belirtiler-ve-korunma-yollari