Got my soil samples collected and mixed with the Luria Broth and Rhodococcus globerulus, which we have dubbed Rhoglo for the class.
I’m excited to see how it is on Friday.
my science blog has reawakened with glorious purpose and i am so stoked to do this class i cant take it
i have my 50cc conical tubes ready to get my soil samples and i just wow what a time to be alive
My university is one of very few to be working with Howard Hughes Medical Institute’s virus hunters/phage masters program and we are one of the schools piloting the use of Rhodococcus globerulus instead of Myobacterium smegmatis.
I am flipping desks right now. This is huge.
I collect my soil sample to get phages on Wednesday
The defining feature of the adaptive immune response is its specificity, its unique ability to mount a precisely targeted response to just about any non-self intruder. While both B and T cells are capable of targeting certain antigens, the B cell receptor (BCR) is virtually unlimited in its potential specificities. It can bind to every class of biological molecule and even some external, synthetic molecules (Chan and Brink, 2012). The process of refining the BCR for this purpose has been studied extensively, yet the exact mechanism remains elusive. This is due in part to the fact that the complex mutagenic pathways involved in the selection and generation of high-affinity B cells are constantly changing, making it impossible to track cells of known affinities through the cycle to their ultimate fate (Anderson et al., 2009). Despite these challenges, a proposed model describes a process in which the initial V(D)J rearrangement in naïve B cells in bone marrow is followed by subsequent rounds of somatic hypermutation (SHM) in forming the germinal centre, which allows for the accumulation of point mutations on the variable region of the BCR and is responsible for any change in receptor affinity. The finer details of BCR selection are not well understood, but it is surmised that affinity maturation relies on a two signal pathway (Victoria and Nussenzweig, 2012; Zotos and Tarlinton 2012). The first part is when SHM takes place and selection of the newly mutated BCR is antigen dependent. The second requires help from CD4+ T helper cells in the follicular zones (Tfh cells) (Chan and Brink, 2012). It is hoped that future understanding of affinity maturation can be used to help in the fields of autoimmunity, hypersensitivity and vaccine development.
Transmission patterns are one of the most important aspects in the epidemiological study of pathogens because understanding how a disease gets into and throughout a population can lead to more effective and streamlined responses. Differences in transmission rates can result from both intrinsic and extrinsic variation, these factors are referred to collectively as transmission heterogeneities. One such heterogeneity is super shedding, in which a small number of infected individuals shed extremely high numbers of a pathogen relative to other individuals, therefore making them responsible for the majority of the transmission burden (Chase-Topping et al., 2008). Though the phenomenon of super shedding is postulated to be important to a variety of different diseases, it has been most studied in Escherichia coli O157:H7, an important zoonotic pathogen. The hope of current research is to figure out a means of targeting control measures at super shedders or the mechanisms of super shedding to prevent transmission.