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We show that algebraic proofs are hard to find: Given an unsatisfiable CNF formula F, it is NP-hard to find a refutation of F in the Nullstellensatz, Polynomial Calculus, or Sherali-Adams proof systems in time polynomial in the size of the shortest such refutation. Our work extends, and gives a simplified proof of, the recent breakthrough of Atserias and Müller (JACM 2020) that established an anal

While the major drivers of melanoma initiation, including activation of NRAS/BRAF and loss of PTEN or CDKN2A, have been identified, the role of key transcription factors that impose altered transcriptional states in response to deregulated signaling is not well understood. The POU domain transcription factor BRN2 is a key regulator of melanoma invasion, yet its role in melanoma initiation remains

Group Exhibition. Hessel Museum, CCS Bard, New York. April 8th - May 27th

We show, through a combination of density function theory-based molecular dynamics simulations (DFT-MD) and experimental X-ray absorption fine structure spectroscopy (XAFS) studies, that the iodate ion (IO 3 -) contains a local region that is strongly hydrated as a cation. The local region adjoining the I atom is sufficiently electropositive that thr

Filipe Pereira är forskargruppsledare för forskargruppenFilipe Pereira is Research Group Leader for this research group

Att studera den ekonomiska utvecklingen i det globala syd ur ett långsiktigt perspektiv blir allt viktigare i en samtid av globalisering, integration och konvergens. Detta har relevans för både det globala nord och de akademiska organisationer i Afrika, Asien och Latinamerika som vuxit fram och håller på att utvecklas.The study of economic development in the Global South from a long-term perspective is of increasing importance in the current era of globalization, integration and convergence. This applies both in the Global North and for the growing academic communities in Africa, Asia and Latin America.

HAMLET (human -lactalbumin made lethal to tumor cells) is a complex of human -lactalbumin and oleic acid (C18:1:9 cis) that kills tumor cells by an apoptosis-like mechanism. Previous studies have shown that a conformational change is required to form HAMLET from -lactalbumin, and that a partially unfolded conformation is maintained in the HAMLET complex. This study examined if unfolding of -lactal

Agonist-induced activation of smooth muscle involves a rise in intracellular Ca(2+) concentration and sensitization of myosin light chain phosphorylation to Ca(2+). Sr(2+) can enter through Ca(2+) channels, be sequestered and released from sarcoplasmic reticulum, and replace Ca(2+) in activation of myosin light chain phosphorylation. Sr(2+) cannot replace Ca(2+) in facilitation of agonist-activate

Affymetrix GeneChip technology and quantitative real-time PCR (Q-PCR) were used to examine changes in gene expression in the adult murine substantia nigra pars compacta (SNc) following lentiviral glial cell line-derived neurotrophic factor (GDNF) delivery in adult striatum. We identified several genes that were upregulated after GDNF treatment. Among these, the gene encoding the transmembrane prot

This thesis is a study of women in Belfast in two working-class ethno-national communities: Falls (Catholic/Nationalist/Republican) and Shankill (Protestant/Unionist/Loyalist). Theories of gendered nationalism and transversalism are used to analyze the material from a qualitative interview study. The study focuses on intersections of gender and nation: women’s identity as biological, cultural and

Följderna av narkotikamissbruk kostar samhället stora summor pengar varje år. Att beräkna den exakta storleken på dessa summor är omöjligt, eftersom stora delar av den narkotikarelaterade verksamheten är olaglig. De kostnadsberäkningar man kan göra blir ungefärliga uppskattningar. Ändå är det viktigt att försöka, eftersom den kunskap man har om kostnaderna för narkotikamissbrukets konsekvenser utg

BACKGROUND: Survivin regulates cell division and inhibits apoptosis. Liver regeneration is a complex process involving both proliferation and apoptosis. The role of survivin is not well elucidated and no data exist in humans.METHODS: Seventy per cent liver resection was used to investigate liver regeneration in rats. Survivin was identified by means of reverse transcriptase polymerase chain reacti

Inom nuvarande könsnormer så ses kön främst som ett uttryck av biologiska könsgrupper som är binära och olika, men kompletterande. En performativ syn på kön analyserar i stället kön som något som uppstår under sociala interaktioner genom konstant repetition av handlingar som sker inom förhärskande könsdiskurser. Dessa hegemoniska könsdiskurser konstruerar kön som fundamentalt heterosexuellt. DärmeCurrent gender norms predominantly construct gender as an expression of binary sex categories that are different but complementary. A performative view of gender instead analyses gender as an emergent feature of social interactions that is created by the constant repetition of acts in relation to discourses of gender. Within these hegemonic discourses, gender is constructed as fundamentally hetero