About: This protocol has been optimized for recombinant expression of molony virus based reverse transcriptases (RT). The plasmid used contains a reverse transcriptase gene which is derived from Moloney Murine Leukemia Virus. The enzyme when expressed recombinantly can synthesizes a complementary DNA strand from single-stranded RNA, DNA, or an RNA:DNA hybrid. Enzyme Engineering: The enzyme contains point mutations to generate a highly processive, thermostable, and improved fidelity mutant reverse transcriptase. Details, incluiding the sequence of this enzyme are published and can be found in the references below and addgene link. The enzyme contains an active RNAse H domain and is highly thermostable. This MMLV construct contains the following mutations: D200N, L603W, T330P, L139P, E607K,D524G, E562Q, D583N and D653N. These appear to be the same set of mutations present in the Thermo Fisher Maxima H- RT, which is one of the best preforming RTs you can buy. The enzyme in our hands is extremely active. Moreover, while the MMLV RT is thermostable and will work up to 65°C it runs optimally at 42°C. The point muitations utilized here are currently filed under a provisional patent with Thermo Fisher Scientific. Commcercial use of this enzyme must go though Thermo Fisher Scientific. It is also possible to further engineer this enzyme with to increase thermostability and eliminate RNase H activity to generate an enzyme which closely mimicks Thermo Fisher Maxima H+ RT. Introducing mutations (D524G, E562Q, D583N and D653N) and/or (D524, D583, E562, H204, V223, T306, F309) are best suted eliminate RNase H activity completely, and it will increase the thermostability somewhat as well Comments: Reference 2 highlights several point mutations which can be introduced to eliminate Rnase H activity which may also enhance RT sensitivity. Thermo Product information brochure from 2013 suggest that this mutant or some combintation of other identified point mutations from reference 2 is Maxima RT, Maxima H-. The paper has also identified a few more useful point mutations which may further optimise MMLV-RT This expression protocol can also implemented to express other MMLV based reverse transcriptases or diversely related retroviral RTs, provided the genes are in an expresison construct with an N- terminal 6-10 His Tag and are expressed under a T7 promoter. The plasmid used can be found on reclone.org and addgene SkiBar H+ RT was synthesized as a gBlock from IDT and is codon optimized. Expressed in Rosetta DE3 his tag is on still but seems to work fine with it on. Tgatcc motif at MCS is a result of issues cloning in with BamHI. Had to use a compatible sticky end from BclI-HF Protein Properties: 79.9 kDa Isoelectric point (pI) : 7.77 Charge at pH 7.0: 9.52 Name: The name SkiBar H+ RT is an abbreviation of the first two first authors where the MMLV mutations used in the construct were originally discovered (Skirgaila & Baranauskas). References: Baranauskas, Aurimas Paliksa, Sigitas Alzbutas, Gediminas Vaitkevicius, Mindaugas Lubiene, Judita Letukiene, Virginija Burinskas, Sigitas Sasnauskas, Giedrius Skirgaila, Remigijus Generation and characterization of new highly thermostable and processive M-MuLV reverse transcriptase variants Protein Engineering, Design and Selection (2012) Skirgaila, Remigijus Pudzaitis, Vaidas Paliksa, Sigitas Vaitkevicius, Mindaugas Janulaitis, Arvydas Compartmentalization of destabilized enzyme-mRNA-ribosome complexes generated by ribosome display: A novel tool for the directed evolution of enzymes Protein Engineering, Design and Selection (2013)
Stephen Hutchings, Vera Tolz, Precious Chatterje-Doody
et al.
This chapter traces the trajectory of RT from its soft-power Russia Today manifestation to its rebranding as RT and its adoption of an anti-Western populist repertoire to its role as a disinformation apologist for Russia’s invasion of Ukraine. Drawing on interviews with its staff, the chapter reveals how RT’s pre-2022 operating mode reflected its simultaneous self-representation as official state mouthpiece, openly counterhegemonic alt-media outlet, and reputable broadcaster providing global news coverage. RT’s shift from the overt dissemination of positive images of Russia to negative assaults on its adversaries explains the channel’s aspirations to advance alternative narratives touting ruptures in the geopolitical power balance. By embracing principles that enjoy global support—like those behind anti-woke rhetoric—RT insinuates that Russia is the driving force behind them. The chapter considers the contradiction entailed in advocating an emphasis on complexity and contradiction over the linear certainties of information war narratives while advancing this book’s own framing of the broadcaster’s place in the global media conflict.
Stephen Hutchings, Vera Tolz, Precious Chatterje-Doody
et al.
This chapter presents qualitative interviews with RT followers in the United Kingdom, considering why they choose to consume RT’s content and how they engage with it. It demonstrates their failure to bear out common perceptions of their uniform vulnerability to information manipulation. For some, RT’s overt biases deconstruct the liberal illusion of balance and impartiality. Others endorse principles like balance but draw on their experiences of RT to relocate them at radically different, extreme points in the political spectrum. And still others hostile to RT’s propagandistic output find intellectual gratification in their own capacity for meta-ideological analysis. Collectively, these followers pose challenges to how we think about disinformation’s relationship with populism and liberal democracy.
RNA kalitesi, RT-qPCR performansı ve güvenilirliği açısından dikkat edilmesi gereken önemli bir husustur. RT-qPCR çalışmalarında RNA kalite değerlendirilmesine dikkat edilmemesi, yapılan bilimsel çalışmaların güvenilirliği açı-sından önemli bir risk oluşturmaktadır. Bu noktada, RT-qPCR çalışmasının her aşamasında gerekli standartlara uyul-ması ve RNA kalite değerlendirmesinin mutlaka yapılması gerekmektedir. RNA kalitesinin çalışmanın her aşamasında yüksek tutulması, RT-qPCR verimliliğinin ve elde edilen sonuçların güvenilirliğinin artırılmasına olanak tanımaktadır. Yapılan çok sayıda çalışma RNA kalitesinin RT-qPCR sonuçları üzerine olan etkisini ve RNA kalite değerlendirmesinin gerekliliğini ortaya koymaktadır. Bu derlemede, RNA kalitesi, RNA kalite değerlendirmesine kullanılan yöntemler ve RNA kalitesinin RT-qPCR performansı üzerine etkilerinden bahsedilmiştir.
Linear codes constitute an important family of error-correcting codes and have a rich algebraic structure. Initially, these codes were studied with respect to the Hamming metric; while for the past few years, they are also studied with respect to a non-Hamming metric, known as the Rosenbloom–Tsfasman metric (also known as RT metric or ρ metric). In this paper, we introduce and study the split ρ weight enumerator of a linear code in the R-module Mn×s(R) of all n × s matrices over R, where R is a finite Frobenius commutative ring with unity. We also define the Lee complete ρ weight enumerator of a linear code in Mn×s(ℤk), where ℤk is the ring of integers modulo k ≥ 2. We also derive the MacWilliams identities for each of these ρ weight enumerators.