Toplam 109 içerik listeleniyor
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Parazitolojiye Giriş
Öğrencilerin Öğrenmesi Beklenilen Noktalar 1.Parazitler anlatılırken, parazitizmin özünü anlamak. 2.Parazitolojide kullanılan terimler (terminoloji) ile aşina olmak 3.Taxanomic şemaları kullanarak parazitleri sınıflandırmak 4.Hedeflenen paraziti bilimsel (genus-cins, species- tür) ve halk arasındaki adı ile tanımak, patalojisini, ekonomik etkisini ve kullanılan ilaçlara cevabını öğrenmek. 5.Her parazit için asıl konakçıyı yada konakçı gurubunu bilmek....
https://www.biyologlar.com/parazitolojiye-giris -
What was killing the young right whales? New research finds a suspect
This is a right whale calf washed up at Peninsula Valdes, Argentina. New research indicates a likely connection between the deaths of hundreds such calves starting in the mid-2000s and... The baby whales suddenly began dying in 2005. And continued for several years running.
https://www.biyologlar.com/what-was-killing-the-young-right-whales-new-research-finds-a-suspect-haber-8734 -
The Genetic Structure of Anatolia: From the Neolithic to the Oghuz Migrations
Anatolia has witnessed many migrations and has been home to a variety of civilizations. The increasing availability of ancient DNA samples from different periods and cultures makes it now possible to examine the genetic changes that have taken place in Anatolia since the Neolithic. The ancient DNA revolution has already dispelled many myths, but myths and legends die hard. Some of the more persistent ones concern the impact of the last migration wave to hit Anatolia, marked by the arrival of...
https://www.biyologlar.com/the-genetic-structure-of-anatolia-from-the-neolithic-to-the-oghuz-migrations -
RNA from Trained Aplysia Can Induce an Epigenetic Engram for Long-Term Sensitization in Untrained Aplysia.
Abstract The precise nature of the engram, the physical substrate of memory, remains uncertain. Here, it is reported that RNA extracted from the central nervous system of Aplysia given long-term sensitization training induced sensitization when injected into untrained animals; furthermore, the RNA-induced sensitization, like training-induced sensitization, required DNA methylation. In cellular experiments, treatment with RNA extracted from trained animals was found to increase excitability...
https://www.biyologlar.com/rna-from-trained-aplysia-can-induce-an-epigenetic-engram-for-long-term-sensitization-in-untrained-aplysia- -
RNA from Trained Aplysia Can Induce an Epigenetic Engram for Long-Term Sensitization in Untrained Aplysia.
Abstract The precise nature of the engram, the physical substrate of memory, remains uncertain. Here, it is reported that RNA extracted from the central nervous system of Aplysia given long-term sensitization training induced sensitization when injected into untrained animals; furthermore, the RNA-induced sensitization, like training-induced sensitization, required DNA methylation. In cellular experiments, treatment with RNA extracted from trained animals was found to increase excitability...
https://www.biyologlar.com/rna-from-trained-aplysia-can-induce-an-epigenetic-engram-for-long-term-sensitization-in-untrained-aplysia- -
Hirfanlı Baraj Gölünde Yaşayan Yayın Balığı ( Silurus glanis L.,1758 ) nın Sindirim Kanalı Helmintlerinin Tespiti
Hirfanlı Baraj Gölünde Yaşayan Yayın Balığı ( Silurus glanis L.,1758) nın Sindirim Kanalı Helmintlerinin Tespiti
https://www.biyologlar.com/hirfanli-baraj-golunde-yasayan-yayin-baligi-silurus-glanis-l-1758-nin-sindirim-kanali-helmintlerinin-tespiti -
Improving the delivery of chemotherapy with graphene
A new study published in IOP Publishing's journal 2D Materials has proposed using graphene as an alternative coating for catheters to improve the delivery of chemotherapy drugs. The research suggests that placing graphene - an extremely thin sheet of carbon atoms - on the internal surfaces of intravenous catheters commonly used to deliver chemotherapy drugs into a patient's body will improve the efficacy of treatments, and reduce the potential of the catheters breaking. The study indicates...
https://www.biyologlar.com/improving-the-delivery-of-chemotherapy-with-graphene -
Scientists reconstruct ancient impact that dwarfs dinosaur-extinction blast
Picture this: A massive asteroid almost as wide as Rhode Island and about three to five times larger than the rock thought to have wiped out the dinosaurs slams into Earth. The collision punches a crater into the planet's crust that's nearly 500 kilometers (about 300 miles) across: greater than the distance from Washington, D.C. to New York City, and up to two and a half times larger in diameter than the hole formed by the dinosaur-killing asteroid. Seismic waves bigger than any recorded...
https://www.biyologlar.com/scientists-reconstruct-ancient-impact-that-dwarfs-dinosaur-extinction-blast -
Opuntia ficusindica - "Dikenli İncir"
Opuntia ficusindica "Dikenli İncir" derler. Ayrıca pabuç inciri, frenk inciri, kaynana dili gibi başka isimleri de var...
https://www.biyologlar.com/opuntia-ficusindica-dikenli-incir -
ARITMA TESİSLERİ VE PROTOZOA
Çalışma metodları birbirinden farklı olsa da arıtma tesislerinin tamamı çeşitli protozoon gruplarını barındırır (Çizelge 1). Biyolojik unsurlar organik madde üzerinden beslenerek organik maddenin topaklaşmasını ve çökmesini sağlarlar. Bakteri bu maddelerin sıvı fazdan uzaklaştırılmasında rol alan en etkin organizma grubunu oluştur. Protozoonlar, atık su arıtma sistemlerinde biyolojik parçalanmadan sorumlu bakteriler üzerinden beslendiklerinden dolayı, önceleri...
https://www.biyologlar.com/aritma-tesisleri-ve-protozoa -
Virginia Tech researchers take cue from spider glue in efforts to create new materials
A taut tug on the line signals the arrival of dinner, and the leggy spider dashes across the web to find a tasty squirming insect. The spider, known as an orb weaver, must perfectly execute this moment, from a lightning-fast reaction to an artfully spun web glistening with sticky glue. This glue -- created when glycoproteins are secreted from a spider's abdomen and interact with the atmosphere -- has been studied for the past 12 years by Brent Opell, a professor of biological sciences in the...
https://www.biyologlar.com/virginia-tech-researchers-take-cue-from-spider-glue-in-efforts-to-create-new-materials -
Role of telomeres in plant stem cells discovered
The role played by telomeres in mammalian cells has been known for several years. It is also known that these non-coding DNA sequences, which are found at the ends of the chromosomes, protect them and are necessary to ensure correct cell division.
https://www.biyologlar.com/role-of-telomeres-in-plant-stem-cells-discovered -
Epigenetic signatures that differentiate triple-negative breast cancers
The new study, published in Nature Communications, compares the breast cancer DNA 'methylome' with that of healthy individuals. The methylome provides a new picture of the genome and shows how it is epigenetically 'decorated' with methyl groups, a process known as DNA 'methylation'.
https://www.biyologlar.com/epigenetic-signatures-that-differentiate-triple-negative-breast-cancers -
Great Barrier Reef marine reserves combat coral disease
A new and significant role for marine reserves on the Great Barrier Reef has been revealed, with researchers finding the reserves reduce the prevalence of coral diseases. It's been known for some time that marine reserves are important for maintaining and enhancing fish stocks, but this is the first time marine reserves have been shown to enhance coral health on the Great Barrier Reef. Researchers from the ARC Centre of Excellence for Coral Reef Studies at James Cook University found that...
https://www.biyologlar.com/great-barrier-reef-marine-reserves-combat-coral-disease -
Unpacking embryonic pluripotency
Researchers at EMBL's European Bioinformatics Institute (EMBL-EBI) and the Wellcome Trust- Medical Research Council Cambridge Stem Cell Institute at the University of Cambridge have identified factors that spark the formation of pluripotent cells.
https://www.biyologlar.com/unpacking-embryonic-pluripotency -
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 -
Perfecting a viral pack mule
Viruses aren't always bad. In fact, scientists can harness the capabilities of some viruses for good--modifying the viruses to carry drug molecules, for example. One useful virus has been cowpea mosaic virus (CPMV), a plant pathogen that can be modified to aid in tumor detection and even chemotherapy. In a new study, published online ahead of print in the journal Structure, researchers at The Scripps Research Institute (TSRI) report that, based on its structure, a hollowed-out version of CPMV...
https://www.biyologlar.com/perfecting-a-viral-pack-mule -
A quartet of genes controls growth of blood stem cells
An important element in getting blood stem cells to multiply outside the body is to understand which of the approximately 20 000 genes in the human body control their growth. A research team at Lund University in Sweden has studied close to 15 000 of these genes alongside each other. The researchers have succeeded in identifying four key genes which, together, govern the growth and multiplication of the stem cells. The study is now being published in the journal Cell Reports. Every day, over...
https://www.biyologlar.com/a-quartet-of-genes-controls-growth-of-blood-stem-cells -
Researchers use single molecule of DNA to create world's smallest diode
Researchers at the University of Georgia and at Ben-Gurion University in Israel have demonstrated for the first time that nanoscale electronic components can be made from single DNA molecules. Their study, published in the journal Nature Chemistry, represents a promising advance in the search for a replacement for the silicon chip. The finding may eventually lead to smaller, more powerful and more advanced electronic devices, according to the study's lead author, Bingqian Xu. "For 50 years,...
https://www.biyologlar.com/researchers-use-single-molecule-of-dna-to-create-worlds-smallest-diode -
Researchers use single molecule of DNA to create world's smallest diode
Researchers at the University of Georgia and at Ben-Gurion University in Israel have demonstrated for the first time that nanoscale electronic components can be made from single DNA molecules. Their study, published in the journal Nature Chemistry, represents a promising advance in the search for a replacement for the silicon chip. The finding may eventually lead to smaller, more powerful and more advanced electronic devices, according to the study's lead author, Bingqian Xu. "For 50 years,...
https://www.biyologlar.com/researchers-use-single-molecule-of-dna-to-create-worlds-smallest-diode -
Why human egg cells don't age well
When egg cells form with an incorrect number of chromosomes--a problem that increases with age--the result is usually a miscarriage or a genetic disease such as Down syndrome. Now, researchers at the RIKEN Center for Developmental Biology in Japan have used a novel imaging technique to pinpoint a significant event that leads to these types of age-related chromosomal errors. Published in Nature Communications, the study shows that as egg cells mature in older women, paired copies of matching...
https://www.biyologlar.com/why-human-egg-cells-dont-age-well -
Biodiversity: 11 new species come to light in Madagascar
Madagascar is home to extraordinary biodiversity, but in the past few decades, the island's forests and associated biodiversity have been under greater attack than ever. Rapid deforestation is affecting the biotopes of hundreds of species, including the panther chameleon, a species with spectacular intra-specific colour variation. A new study by Michel Milinkovitch, professor of genetics, evolution, and biophysics at the University of Geneva (UNIGE), led in close collaboration with colleagues...
https://www.biyologlar.com/biodiversity-11-new-species-come-to-light-in-madagascar -
How a single molecule turns one immune cell into another
All it takes is one molecule to reprogram an antibody-producing B cell into a scavenging macrophage. This transformation is possible, new evidence shows, because the molecule (C/EBPa, a transcription factor) "short-circuits" the cells so that they re-express genes reserved for embryonic development. The findings appear July 30 in Stem Cell Reports, the journal of the International Society for Stem Cell Research. Over the past 28 years, researchers have shown that a number of specialized cell...
https://www.biyologlar.com/how-a-single-molecule-turns-one-immune-cell-into-another -
Eukaryotes: A new timetable of evolution
Contaminated samples have evidently created some confusion in the timetable of life. On the basis of ultra-clean analyses, an international team, including scientists from the Max Planck Institute for Biogeochemistry, has disproved supposed evidence that eukaryotes originated 2.5 to 2.8 billion years ago. In contrast to prokaryotes such as bacteria, eukaryotes have a nucleus. Some researchers thought they had discovered molecular remnants of living organisms in rock samples up to 2.8 billion...
https://www.biyologlar.com/eukaryotes-a-new-timetable-of-evolution -
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 -
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 -
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 -
Searching for an ancient syphilis DNA in newborns
The ancient bones of newborns are very useful to recover the ancient DNA of the bacteria causing syphilis, the Treponema pallidum pallidum. This is the conclusion reached by a study led by Universitat Autònoma de Barcelona (UAB), which was able to obtain the genetic material from the bacteria in more than one individual, in what is considered to be the oldest case known to date. Several previous intents had only achieved to yield this material in one occasion and from only one...
https://www.biyologlar.com/searching-for-an-ancient-syphilis-dna-in-newborns -
Butterfly mimicry through the eyes of bird predators
In the natural world, mimicry isn't entertainment; it's a deadly serious game spanning a range of senses - sight, smell and hearing. Some of the most striking visual mimics are butterflies. Many butterflies become noxious and unpalatable to predators by acquiring chemical defences from plants they ingest as caterpillars. Other butterflies mimic the 'aposematic' or warning colouration and conspicuous wing patterns of these toxic or just plain foul-tasting butterflies. In a new study, scientists...
https://www.biyologlar.com/butterfly-mimicry-through-the-eyes-of-bird-predators -
A 'supergene' underlies genetic differences sexual behaviour in male ruff
The ruff is a Eurasian shorebird that has a spectacular lekking behaviour where highly ornamented males compete for females. Now two groups report that males with alternative reproductive strategies carry a chromosomal rearrangement that has been maintained as a balanced genetic polymorphism for about 4 million years. The two studies, one led by scientists at Uppsala university, are published today in Nature Genetics. Three different types of ruff males occur at the leks of this species....
https://www.biyologlar.com/a-supergene-underlies-genetic-differences-sexual-behaviour-in-male-ruff -
New insights into a virus proteome
The genome encodes the complete information needed by an organism, including that required for protein production. Viruses, which are up to a thousand times smaller than human cells, have considerably smaller genomes. Using a type of herpesvirus as a model system, the scientists of the Max Planck Institute of Biochemistry in Martinsried near Munich and their collaboration partners at the University of California in San Francisco have shown that the genome of this virus contains much more...
https://www.biyologlar.com/new-insights-into-a-virus-proteome -
Hydra can modify its genetic program
Champion of regeneration, the freshwater polyp Hydra is capable of reforming a complete individual from any fragment of its body. It is even able to remain alive when all its neurons have disappeared. Researcher the University of Geneva (UNIGE), Switzerland, have discovered how: cells of the epithelial type modify their genetic program by overexpressing a series of genes, among which some are involved in diverse nervous functions. Studying Hydra cellular plasticity may thus influence research...
https://www.biyologlar.com/hydra-can-modify-its-genetic-program -
Hydra can modify its genetic program
Champion of regeneration, the freshwater polyp Hydra is capable of reforming a complete individual from any fragment of its body. It is even able to remain alive when all its neurons have disappeared. Researcher the University of Geneva (UNIGE), Switzerland, have discovered how: cells of the epithelial type modify their genetic program by overexpressing a series of genes, among which some are involved in diverse nervous functions. Studying Hydra cellular plasticity may thus influence research...
https://www.biyologlar.com/hydra-can-modify-its-genetic-program -
Genetic code of red blood cells discovered
Eight days. That's how long it takes for skin cells to reprogram into red blood cells. Researchers at Lund University in Sweden, together with colleagues at Center of Regenerative Medicine in Barcelona, have successfully identified the four genetic keys that unlock the genetic code of skin cells and reprogram them to start producing red blood cells instead. "We have performed this experiment on mice, and the preliminary results indicate that it is also possible to reprogram skin cells from...
https://www.biyologlar.com/genetic-code-of-red-blood-cells-discovered -
Genetic code of red blood cells discovered
Eight days. That's how long it takes for skin cells to reprogram into red blood cells. Researchers at Lund University in Sweden, together with colleagues at Center of Regenerative Medicine in Barcelona, have successfully identified the four genetic keys that unlock the genetic code of skin cells and reprogram them to start producing red blood cells instead. "We have performed this experiment on mice, and the preliminary results indicate that it is also possible to reprogram skin cells from...
https://www.biyologlar.com/genetic-code-of-red-blood-cells-discovered -
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 -
X-rays reveal the photonic crystals in butterfly wings that create color
When you look very close up at a butterfly wing, you can see this patchwork map of lattices with slightly different orientations (colors added to illustrate the domains).
https://www.biyologlar.com/x-rays-reveal-the-photonic-crystals-in-butterfly-wings-that-create-color -
X-rays reveal the photonic crystals in butterfly wings that create color
When you look very close up at a butterfly wing, you can see this patchwork map of lattices with slightly different orientations (colors added to illustrate the domains).
https://www.biyologlar.com/x-rays-reveal-the-photonic-crystals-in-butterfly-wings-that-create-color -
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 -
Scientists learn more about how star-shaped brain cells help us learn
A molecule that enables strong communication between our brain and muscles appears to also aid essential communication between our neurons, scientists report.
https://www.biyologlar.com/scientists-learn-more-about-how-star-shaped-brain-cells-help-us-learn -
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 -
Open chromatin profiling key to identifying leukemia cells of origin
Every cancer starts with a single cell, and Jackson Laboratory (JAX) researchers have found a precise and reliable way -- whole-genome profiling of open chromatin -- to identify the kind of cell that leads to a given case of leukemia, a valuable key to cancer prognosis and outcome. "Knowing the cell of origin of cancer cells can provide insight into tumor subtypes and possibly diagnostic and therapeutic benefit," says JAX Assistant Professor Jennifer Trowbridge, Ph.D., the lead author of the...
https://www.biyologlar.com/open-chromatin-profiling-key-to-identifying-leukemia-cells-of-origin -
Ancient algae found deep in tropical glacier
The remains of tiny creatures found deep inside a mountaintop glacier in Peru are clues to the local landscape more than a millennium ago, according to a new study by Rice University, the University of Nebraska-Lincoln and Ohio State University. The unexpected discovery of diatoms, a type of algae, in ice cores pulled from the Quelccaya Summit Dome Glacier demonstrate that freshwater lakes or wetlands that currently exist at high elevations on or near the mountain were also there in earlier...
https://www.biyologlar.com/ancient-algae-found-deep-in-tropical-glacier -
NIH-funded study establishes genomic data set on Lassa virus
An international team of researchers has developed the largest genomic data set in the world on Lassa virus (LASV). The new genomic catalog contains nearly 200 viral genomes collected from patient samples in Sierra Leone and Nigeria, as well as field samples from the major animal reservoir, or host, of Lassa virus--the rodent Mastomys natalensis, also called the multimammate rat. The researchers show that LASV strains cluster into four major groups based on geographic location, with three in...
https://www.biyologlar.com/nih-funded-study-establishes-genomic-data-set-on-lassa-virus -
Fetal mice with Zika infection get microcephaly
Mouse fetuses injected with the Asian Zika virus strain and carried to term within their pregnant mothers display the characteristic features of microcephaly, researchers in China report May 11 in Cell Stem Cell. As expected, the virus infected the neural progenitor cells, and infected brains reveal expression of genes related to viral entry, altered immune response, and cell death. The authors say this is direct evidence that Zika infection causes microcephaly in a mammalian animal...
https://www.biyologlar.com/fetal-mice-with-zika-infection-get-microcephaly -
Fetal mice with Zika infection get microcephaly
Mouse fetuses injected with the Asian Zika virus strain and carried to term within their pregnant mothers display the characteristic features of microcephaly, researchers in China report May 11 in Cell Stem Cell. As expected, the virus infected the neural progenitor cells, and infected brains reveal expression of genes related to viral entry, altered immune response, and cell death. The authors say this is direct evidence that Zika infection causes microcephaly in a mammalian animal...
https://www.biyologlar.com/fetal-mice-with-zika-infection-get-microcephaly