By Marisa Sanchez, Molecular and Cellular Biology ’15
Green tea has been said to have several health benefits including helping prevent certain types of cancer and inflammation. In a new study done by Dr. Beglinger and Dr. Borgwardt at the University of Basel in Switzerland, they have found that green tea extract enhances cognitive functions, particularly the working memory because green tea extract increases the brain’s effective connectivity, the causal influence that one part of the brain exerts on another part. Continue reading Green Tea Can Improve Your Memory
By Ashley Chang, Genetics ’15
Researchers at the University of Basel in Switzerland have successfully used lab-engineered cartilage for nose reconstruction. This study was conducted on five patients between ages 76 and 88 who had significant nasal damage after skin cancer surgery. One year after the replacement, all of them note significant improvement in the ability to breathe as well as cosmetic appeal, and no patients had significant side effects. This is a groundbreaking study as it opens of the possibility of engineered cartilage replacement in other areas, such as the knee, and of tissue-engineering as a whole. Continue reading Lab Engineered Cartilage used in Nose Reconstruction
By Jenny Cade, Biochemistry & Molecular Biology ’15
Eating grass-fed beef and pasture-raised chicken is the eco-friendly thing to do–right? Maybe not, according to a recent paper published in the Proceedings in the National Academy of Science. The study proposes that intensifying livestock production by transitioning from pure grazing to mixed systems–where animals are fed high-energy food like grains–could reduce livestock greenhouse gas emissions by 23% by 2030. Currently, livestock account for 14.5% of all anthropogenic greenhouse gas emissions, so such a reduction would be significant.
In contrast, a comment piece that appeared in Nature last month calls for increasing grazing to make livestock systems more sustainable. Of eight strategies that the authors outline to reduce the environmental and economic costs of raising livestock, “Feed animals less human food” is number one.
Continue reading Grass-fed or grain-fed?
This is a submission from UC Davis CBS Professor Sean Burgess. It comes from a future publication that relates the human quest to visualize the inner workings of the cell, molecular biology, with the quest to visualize the interior of the mind, art.
The Eukaryotic Ribosome
The basic mechanism of ribosomebased protein synthesis is conserved among all domains of life. The ribosome comes in two parts. The small subunit interacts with the mRNA and decodes the interaction with the aminoacyl tRNAs. The large subunit contains the active site of peptidyl transferase. The two subunits together
form three pockets for three forms of tRNA. The A site is where the aminoacyl tRNA binds, the P site holds that peptidyl tRNA when the Asite is occupied. The E site contains the deacylated tRNA following peptidyl transferase. The ribosome is a huge conglomeration of RNA and proteins. The RNA appears to do all the heavy lifting for the main catalytic event of protein synthesis. So what came first, the protein or the ribosome?
Obtaining the crystal structure of the ribosome was a tour de force effort. The Nobel Prize for solving its structure was awarded in 2009.
Top: Willi Baumeister: Mortaruru with Red Overhead (1953), The Art Book,
Phaidon Press Limited, 1994.
Bottom: The 60S (PDB: 305H) and 40S (PDB: 1S1H) subunits of the eukaryotic ribosome. BenShem et al. (2010) Science, 330 (6008): 12031209. The image was generated by S.M.B. using MacPymol using coordinates from the Protein Databank (http://helixweb.nih.gov/cgibin/pdb). MacPyMOL is product of
Schrodinger, LLC. Copyright (C) 20092010.
By: Jack Taylor, Biochemistry and Molecular Biology ’15
Sponsor: Michael Turelli, Ph.D.
Ecology and Evolution
Many species of arthropods host Wolbachia, maternally transmitted bacteria that often influence host reproduction. This manipulation of host reproduction has contributed to Wolbachia becoming a normally-present infection of many Drosophila simulans. The Y36 isofemale line, a population of Drosophila simulans created from a single female collected in 2010 in Yolo County, produces flies which have an unusual phenotype when reciprocally crossed with uninfected simulans populations denoted U. The cross between Y36 male and U female produces female offspring with significantly lower fecundity than the reciprocal cross (Y36 female with U male). It is possible that this effect is a result of a paternal defect gene that is masked by the Wolbachia infection. Ten separate sublines were created from the Y36 isofemale line. The goal of my experiment was to determine whether this phenotype is still present among each of the ten sublines and if there is any variation in the phenotype among the sublines. Analysis of the data indicates that the qualitative effect of the phenotype has been preserved across the sublines but suggests that there is quantitative variation amongst them.
By Isra Uz-Zaman, Genetics ’14
Cheating in sports in not a new phenomenon. In the modern era, numerous athletes participate in blood doping by injecting erythropoietin (EPO) into their blood to increase the amount of red blood cells and thus improve their athletic performance. EPO is a protein hormone produced by the kidney which stimulates the production of red blood cells when released into the bloodstream. Increased red blood production increases the amount of oxygen available in the body and boosts an athlete’s performance. Yannis Pitsiladis, a psychologist in Scotland, is at the forefront of developing anti-doping testing based on the genetic fingerprint left by drugs. Conventionally researches developed tests to find the drug, but Pitsiladis has taken another approach. He is developing a new generation of tests that will gather evidence from the doper’s own body.
Continue reading Stop Looking for the Drug. Look at the Genes – Bulletproof Anti-doping Test
By: Varsha Prasad, Genetics ’15
A study to employ a new method of generating human embryonic stem cells without destroying any human embryos is currently being conducted by an international research team led by Karl Tryggvason, Professor Medical Chemistry at Karolinska Institutet and a Professor at Duke-NUS Graduate Medical School in Singapore.
The researchers developed a method in which embryonic stem cells can be obtained from a single cell of an eight-cell embryo, which can then be refrozen and placed in the woman’s uterus. This prevents the need to destroy human embryos in the process. The idea is that the embryo can survive a single cell removal. Continue reading New Method Increases Supply of Embryonic Stem Cells
Work by Don Hoang, 4th year Microbiology major at UCD. Pieces were featured on a scientific poster on Drosophila/Yeast interactions in 2014.
By David Ivanov, Biochemistry ’15
Oral vaccines are known to be a convenient and effective method for treatment or prevention of diseases caused by pathogenic microorganisms. The difficulty of developing such vaccines is due to the often inhospitable environment of the stomach and intestinal tract because of low pH, or acidity, as well as enzymes that can digest or destroy biological molecules. Using a virus-like particle to deliver the vaccine is an advantageous method for getting around these and other barriers in the host organism.
A virus-like particle, or VLP, is a biological particle that resembles a virus, but contains no genetic information and thus cannot infect host cells. VLP’s can be formed by inserting and expressing just the genes for creating the viral capsid, which is a shell made up of protein subunits that protects the infectious genetic information in wild-type, or normal, viruses. The expressed capsid proteins can then self-assemble into the VLP. The capsid also has domains, or structural areas, that are responsible for recognizing suitable host cells to infect and inserting the viral genome.
Continue reading Engineering Hepatitis Virus-like Particles for Oral Vaccine Delivery
By Ashley Chang, Genetics ’15
Researchers at the GEOMAR Helmhotltz Centre for Ocean Research Kiel are studying the long-term effects of “climate engineering” methods that could help to preserve the climate and protect from rising temperatures. This winter every part of the world except the eastern United States reported record breaking high temperatures. Although political agreements have been made to reducing greenhouse gas emissions, the effects may be too slow as levels of CO2 and other greenhouse gases continue to rise. This is especially important as populous countries, such as China and India, become increasingly industrialized and consequentially raise their greenhouse gas emissions. Continue reading Climate Engineering: Worth the Risk?