Toplam 124 içerik listeleniyor
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Herpes outbreak, other marine viruses linked to coral bleaching event
A major coral bleaching event took place on this part of the Great Barrier Reef in Australia. A study at Oregon State University has concluded that significant outbreaks of viruses may be associated with coral bleaching events, especially as a result of multiple environmental stresses.
https://www.biyologlar.com/herpes-outbreak-other-marine-viruses-linked-to-coral-bleaching-event-haber-8728 -
Genomda İnsan Beyni İçin Önemli Endojenik Retrovirüsler
Brattas ve ark. ERV'lerin insan sinir öncü hücrelerinde TRIM28 ile bağlandığını bildirmiştir. Bu, gelişmekte olan insan beynindeki transkripsiyonel ağların kontrolünde ERV'ler için bir rol teşkil ederek, yakın gen ekspresyonunu etkileyen yerel heterokromatin oluşturulmasına neden olur.
https://www.biyologlar.com/genomda-insan-beyni-icin-onemli-endojenik-retrovirusler -
Genomda İnsan Beyni İçin Önemli Endojenik Retrovirüsler
Brattas ve ark. ERV'lerin insan sinir öncü hücrelerinde TRIM28 ile bağlandığını bildirmiştir. Bu, gelişmekte olan insan beynindeki transkripsiyonel ağların kontrolünde ERV'ler için bir rol teşkil ederek, yakın gen ekspresyonunu etkileyen yerel heterokromatin oluşturulmasına neden olur.
https://www.biyologlar.com/genomda-insan-beyni-icin-onemli-endojenik-retrovirusler -
Tarih öncesi insanlarda Hepatit B virüsü bulunduğu ortaya çıktı
Hepatitis viral partiküllerinin illustrasyonu Kaynak: ISTOCK, SARATHSASIDHARAN
https://www.biyologlar.com/tarih-oncesi-insanlarda-hepatit-b-virusu-bulundugu-ortaya-cikti -
Tarih öncesi insanlarda Hepatit B virüsü bulunduğu ortaya çıktı
Hepatitis viral partiküllerinin illustrasyonu Kaynak: ISTOCK, SARATHSASIDHARAN
https://www.biyologlar.com/tarih-oncesi-insanlarda-hepatit-b-virusu-bulundugu-ortaya-cikti -
Tarih öncesi insanlarda Hepatit B virüsü bulunduğu ortaya çıktı
Hepatitis viral partiküllerinin illustrasyonu Kaynak: ISTOCK, SARATHSASIDHARAN
https://www.biyologlar.com/tarih-oncesi-insanlarda-hepatit-b-virusu-bulundugu-ortaya-cikti -
Ölümcül Protein: Prion
1980'lerin başında Amerikalı nörolog Stanley B. Prusiner ve meslektaşları, "prion" olarak kısaltılmış bir ad olan "proteinli bulaşıcı parçacığı"nı ("önceden" olarak telaffuz edilir) tanımladılar.
https://www.biyologlar.com/olumcul-protein-prion -
Ölümcül Protein: Prion
1980'lerin başında Amerikalı nörolog Stanley B. Prusiner ve meslektaşları, "prion" olarak kısaltılmış bir ad olan "proteinli bulaşıcı parçacığı"nı ("önceden" olarak telaffuz edilir) tanımladılar.
https://www.biyologlar.com/olumcul-protein-prion -
Ölümcül Protein: Prion
1980'lerin başında Amerikalı nörolog Stanley B. Prusiner ve meslektaşları, "prion" olarak kısaltılmış bir ad olan "proteinli bulaşıcı parçacığı"nı ("önceden" olarak telaffuz edilir) tanımladılar.
https://www.biyologlar.com/olumcul-protein-prion -
Kene İle Bulaşan Hastalıklar
ÖZET Parazitlerin neden olduğu hastalıklar önemli sağlık problemidir. Endoparazit ve ektoparaziter hastalıklar mevcuttur. Kenelerle bulaşan hastalıklar en sık görülen vektör kaynaklı hastalıklardır. Keneler bakteri, virüs spiroket, protozoa, nematod ve toksinler gibi patojenleri yayabilir ve böylece ektoparaziter kaynaklı hastalıklara sebep olurlar. Ülkemizde keneler için iklim koşulları, bitki örtüsü ve yüzey şekli bakımından uygun koşullar vardır. Bu...
https://www.biyologlar.com/kene-ile-bulasan-hastaliklar -
Rethinking the reef
A new study by biologists at San Diego State University and Scripps Institution of Oceanography shows that inhabited coral islands that engage in commercial fishing dramatically alter their nearby reef ecosystems, disturbing the microbes, corals, algae and fish that call the reef home. The study's lead author, Linda Wegley Kelly, is a postdoctoral scholar in the lab of SDSU virologist Forest Rohwer. For the study, she looked at seawater samples collected from the surfaces of reefs surrounding...
https://www.biyologlar.com/rethinking-the-reef -
Virüsler Hakkında Bilgi
Virüs, canlı hücreleri enfekte edebilen mikroskopik taneciktir. Virüsler ancak bir konak hücreyi enfekte ederek çoğalabilirler.
https://www.biyologlar.com/virusler-hakkinda-bilgi -
Chip-based technology enables reliable direct detection of Ebola virus
A team led by researchers at UC Santa Cruz has developed chip-based technology for reliable detection of Ebola virus and other viral pathogens. The system uses direct optical detection of viral molecules and can be integrated into a simple, portable instrument for use in field situations where rapid, accurate detection of Ebola infections is needed to control outbreaks. Laboratory tests using preparations of Ebola virus and other hemorrhagic fever viruses showed that the system has the...
https://www.biyologlar.com/chip-based-technology-enables-reliable-direct-detection-of-ebola-virus -
Virüslerin sınıflandırılması
Fosillerinin olmaması ve virüslerin canlı olup olmadığı tartışmaları nedeniyle taksonomide virüslerin sınıflandırılması sorunlu olmuştur. Biyolojik sınıflandırmadaki üst âlemlerin (domain) içine kolayca yerleştirilemedikleri için sınıfları takım basamağından başlatılmıştır. Ancak, bir üst âlem ismi olarak Acytota adı önerilmiştir. Bu öneriye göre virüsler Bakteria, Arkea ve Eukaryota üst âlemlerine denk bir taksona aittirler. Halen her familya bir...
https://www.biyologlar.com/viruslerin-siniflandirilmasi -
Odd histone helps suppress jumping genes in stem cells, study says
A family of proteins known as histones provides support and structure to DNA, but for years, scientists have been puzzling over occasional outliers among these histones, which appear to exist for specific, but often mysterious reasons. Now, researchers have uncovered a new purpose for one such histone variant: preventing genetic mutations by keeping certain so-called "jumping genes" in place. This research, which began at Rockefeller University and was published May 4 in Nature, reveals a...
https://www.biyologlar.com/odd-histone-helps-suppress-jumping-genes-in-stem-cells-study-says -
Herpes outbreak, other marine viruses linked to coral bleaching event
A study at Oregon State University has concluded that significant outbreaks of viruses may be associated with coral bleaching events, especially as a result of multiple environmental stresses. One such event was documented even as it happened in a three-day period. It showed how an explosion of three viral groups, including a herpes-like virus, occurred just as corals were bleaching in one part of the Great Barrier Reef off the east coast of Australia. The findings, reported in Frontiers in...
https://www.biyologlar.com/herpes-outbreak-other-marine-viruses-linked-to-coral-bleaching-event -
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 -
KUDUZ VİRÜSÜ
Rhabdovirus’larin en önemli üyesidir. Lipoprotein zarf ile sarılmış mermi şeklinde kapsid içinde tek iplikli RNA içerir. Virion RNA'ya bağımlı RNA polimeraz içerir. Kuduz virüsünün geniş bir konak grubu vardır. Kuduz virüsü hücre yüzeyindeki asetilkolin reseptörüne bağlanır. Virüs kuduz bir hayvanın ısırması ile bulaşır. Bulaştırıcı hayvanlarda viral ensefalite bağlı anormal davranışlar gözlenirken, yarasalarda normal bir görüntü sergiler...
https://www.biyologlar.com/kuduz-virusu -
Tara Oceans expedition yields treasure trove of plankton data
In five related reports in this issue of the journal Science, a multinational team of researchers who spent three and a half years sampling the ocean's sunlit upper layers aboard the schooner Tara unveil the first officially reported global analyses of the Tara Oceans consortium. Planktonic life in the ocean is far more diverse than scientists knew, these reports show. They provide new resources for cataloguing the ocean's numerous planktonic organisms, which -- though critical to life on...
https://www.biyologlar.com/tara-oceans-expedition-yields-treasure-trove-of-plankton-data -
Structure of a hantavirus protein as a promising model for drug design
Bank voles are small rodents that are not dangerous by themselves, but their excreta can contain one of the dangerous hantaviruses. While bank voles are unaffected by the infection, hantaviruses can cause potentially fatal diseases in humans for which no treatments exist. In central and northern Europe, infection is accompanied by fever, headache, or even renal failure. The strain that occurs in East Asia -- the Hantaan virus -- is even more dangerous: up to five percent of infected patients...
https://www.biyologlar.com/structure-of-a-hantavirus-protein-as-a-promising-model-for-drug-design -
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 -
Introduction to Microbiology Culture Techniques
Nicole Gentile, PhD Candidate, provides an overview of basic microbiology and the concepts involved, including the bacterial growth curve and classifying organisms based on morphologies. This lecture describes blood, urine and skin/soft tissue cultures, focusing on the types of media, sample collection processes, culture procedures, as well as speciation and susceptibility testing. Basic staining procedures, such as the simple stain, gram stain, spore stain, negative stain, and acid fast...
https://www.biyologlar.com/introduction-to-microbiology-culture-techniques -
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 -
Virus throws a wrench in the immune system
The cytomegalovirus (CMV) is a member of the herpesvirus family. Although most people carry CMV for life, it hardly ever makes them sick. Researchers from the Helmholtz Centre for Infection Research and from the USA have now unveiled long term consequences of the on-going presence of CMV: Later in life, more and more cells of the immune system concentrate on CMV, and as a result, the response against other viruses is weakened. These research results help to explain why the elderly are often...
https://www.biyologlar.com/virus-throws-a-wrench-in-the-immune-system -
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 -
Antibiotic 'smart bomb' can target specific strains of bacteria
Researchers from North Carolina State University have developed a de facto antibiotic "smart bomb" that can identify specific strains of bacteria and sever their DNA, eliminating the infection. The technique offers a potential approach to treat infections by multi-drug resistant bacteria. "Conventional antibiotic treatments kill both 'good' and 'bad' bacteria, leading to unintended consequences, such as opportunistic infections," says Dr. Chase Beisel, an assistant professor of chemical and...
https://www.biyologlar.com/antibiotic-smart-bomb-can-target-specific-strains-of-bacteria -
Relaxation helps pack DNA into a virus
Researchers at the University of California, San Diego have found that DNA packs more easily into the tight confines of a virus when given a chance to relax, they report in a pair of papers to be published in in the early edition of the Proceedings of the National Academy of Sciences the week of May 26 and the May 30 issue of Physical Review Letters. DNA is a long, unwieldy molecule that tends to repel itself because it is negatively charged, yet it can spool tightly. Within the heads of...
https://www.biyologlar.com/relaxation-helps-pack-dna-into-a-virus -
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 -
The 'intraterrestrials': New viruses discovered in ocean depths
The intraterrestrials, they might be called. Strange creatures live in the deep sea, but few are odder than the viruses that inhabit deep ocean methane seeps and prey on single-celled microorganisms called archaea. The least understood of life's three primary domains, archaea thrive in the most extreme environments on the planet: near hot ocean rift vents, in acid mine drainage, in the saltiest of evaporation ponds and in petroleum deposits deep underground. Virus in the deep blue sea While...
https://www.biyologlar.com/the-intraterrestrials-new-viruses-discovered-in-ocean-depths -
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 -
Phages transducing antibiotic resistance detected in chicken meat
Bacteria resistant to antibiotics are on the rise. There are different explanations for how resistances are transferred. Researchers from the Vetmeduni Vienna found phages in chicken meat that are able to transfer antimicrobial resistance to bacteria. Phages are viruses that exclusively infect bacteria. They can contribute to the spread of antimicrobial resistance. The findings may also be relevant for clinical settings. The study was published in the journal Applied and Environmental...
https://www.biyologlar.com/phages-transducing-antibiotic-resistance-detected-in-chicken-meat -
Viruses revealed to be a major driver of human evolution
Aminopeptidase N is a protein that acts as a receptor for coronaviruses, the family of viruses behind recent epidemics of SARS and MERS, among others.
https://www.biyologlar.com/viruses-revealed-to-be-a-major-driver-of-human-evolution -
Viruses revealed to be a major driver of human evolution
Aminopeptidase N is a protein that acts as a receptor for coronaviruses, the family of viruses behind recent epidemics of SARS and MERS, among others.
https://www.biyologlar.com/viruses-revealed-to-be-a-major-driver-of-human-evolution -
The Animation of Antimicrobial Resistance
Antimicrobial resistance (AMR) is resistance of a microorganism to an antimicrobial medicine to which it was previously sensitive. Resistant organisms (they include bacteria, viruses and some parasites) are able to withstand attack by antimicrobial medicines, such as antibiotics, antivirals, and antimalarials, so that standard treatments become ineffective and infections persist and may spread to others.
https://www.biyologlar.com/the-animation-of-antimicrobial-resistance -
Researchers discover two new groups of viruses
Researchers at the University of Bonn and the German Center for Infection Research (DZIF) have discovered two new groups of viruses within the Bunyavirus family in the tropical forest of Ivory Coast. Previously only five groups responsible for serious illnesses in humans and animals were known. Most are spread through blood-feeding insects. Based on the discovered viruses researchers conclude that the ancester to all bunyaviruses must have existed in arthropods such as insects. The results are...
https://www.biyologlar.com/researchers-discover-two-new-groups-of-viruses -
Tracking the viral parasites cruising our waterways
Humans aren't the only ones who like to cruise along the waterways, so do viruses. For the first time, a map of fecal viruses traveling our global waterways has been created using modeling methods to aid in assessing water quality worldwide. "Many countries are at risk of serious public health hazards due to lack of basic sanitation," said Joan Rose, Homer Nowlin Chair in water research at Michigan State University. "With this map, however, we can assess where viruses are being discharged from...
https://www.biyologlar.com/tracking-the-viral-parasites-cruising-our-waterways -
Hepatitis A-like virus identified in seals
Scientists in the Center for Infection and Immunity at Columbia University's Mailman School of Public Health have discovered a new virus in seals that is the closest known relative of the human hepatitis A virus. The finding provides new clues on the emergence of hepatitis A. The research appears in the July/August issue of mBio, the online open-access journal of the American Society for Microbiology. "Until now, we didn't know that hepatitis A had any close relatives, and we thought that only...
https://www.biyologlar.com/hepatitis-a-like-virus-identified-in-seals -
Discovery shows how herpes simplex virus reactivates in neurons to trigger disease
When we get cold sores, the reason is likely related to stress. In particular, the neurons in which the herpes simplex virus (HSV) reside, are under stress. For the first time, researchers at the University of North Carolina School of Medicine discovered a cellular mechanism that allows the virus to reactivate. They also found how brain cells are duped into allowing bits of virus to escape the very repressive environment in neurons and cause disease. HSV is found in about 90 percent of the...
https://www.biyologlar.com/discovery-shows-how-herpes-simplex-virus-reactivates-in-neurons-to-trigger-disease -
The Institut Pasteur in French Guiana publishes the first complete genome sequence of the Zika virus
Having confirmed the first cases of infection in Suriname then in French Guiana, the Institut Pasteur in French Guiana has sequenced the complete genome of the
https://www.biyologlar.com/the-institut-pasteur-in-french-guiana-publishes-the-first-complete-genome-sequence-of-the-zika-virus -
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 -
How a cold gets into cells
Cold viruses cause us irritation by penetrating into our cells and transporting their RNA into the cytoplasma of the infected cells. This is the only way they can multiply.
https://www.biyologlar.com/how-a-cold-gets-into-cells -
Researchers map Zika's routes to the developing fetus
Zika virus infects numerous primary cell types and explants of the human placenta, suggesting placental and paraplacental routes of virus transmission.
https://www.biyologlar.com/researchers-map-zikas-routes-to-the-developing-fetus -
Researchers map Zika's routes to the developing fetus
Zika virus infects numerous primary cell types and explants of the human placenta, suggesting placental and paraplacental routes of virus transmission.
https://www.biyologlar.com/researchers-map-zikas-routes-to-the-developing-fetus -
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 -
Mouse antibodies pinpoint Zika's weak spots
This image shows the mapping of the three distinct Zika virus DIII epitopes onto the mature virion
https://www.biyologlar.com/mouse-antibodies-pinpoint-zikas-weak-spots -
Mouse antibodies pinpoint Zika's weak spots
This image shows the mapping of the three distinct Zika virus DIII epitopes onto the mature virion
https://www.biyologlar.com/mouse-antibodies-pinpoint-zikas-weak-spots -
Discovery of new hepatitis C virus mechanism
SPP inhibition reduces production of infectious HCV particles and pathogenesis,
https://www.biyologlar.com/discovery-of-new-hepatitis-c-virus-mechanism -
Discovery of new hepatitis C virus mechanism
SPP inhibition reduces production of infectious HCV particles and pathogenesis,
https://www.biyologlar.com/discovery-of-new-hepatitis-c-virus-mechanism