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The first measurement of ϕ-meson production in p-Pb collisions at a nucleon-nucleon centre-of-mass energy sNN−−−√ = 5.02 TeV has been performed with the ALICE apparatus at the LHC. The ϕ-mesons have been identified in the dimuon decay channel in the transverse momentum (pT) range 1<pT<7 GeV/c, both in the p-going (2.03<y<3.53) and the Pb-going (−4.46<y<−2.96) directions, where y stands for the rapidity in the nucleon-nucleon centre-of-mass. Differential cross sections as a function of transverse momentum and rapidity are presented. The forward-backward asymmetry for ϕ-meson production is measured for 2.96<|y|<3.53, resulting in a factor ∼0.5 with no significant pT dependence within the uncertainties. The pT dependence of the ϕ nuclear modification factor RpPb exhibits an enhancement up to a factor 1.6 at pT = 3-4 GeV/c in the Pb-going direction. The pT dependence of the ϕ-meson cross section in pp collisions at s√ = 2.76 TeV, which is used to determine a reference for the p-Pb results, is also presented here for 1<pT<5 GeV/c and 2.5<y<4.
Zimbabwe: The Urgency of Now
(2015)
Zimbabwe: The Urgency of Now, is a follow-up creative non-fiction book to Zimbabwe: The Blame Game. It goes further than The Blame Game and focuses on Zimbabwe in the GNU entity, the 2013 elections, post elections and post GNU Zimbabwe, and Now. They are a myriad number of problems, issues, limitations that still unbundles Zimbabwe's push towards multiparty democracy, social justice, economic sanity and growth, and The Urgency of Now focuses on the solutions to these. It also tackles the land reform in South Africa, how this could be its biggest problem going forward. It goes further and tackles the larger Africa problem toward democracy, growth, stability and unity, and why the progress towards the United States of Africa has been moribund.
The function of RNA is subtly modulated by post-transcriptional modifications. Here, we report an important crosstalk in the covalent modification of two classes of RNAs. We demonstrate that yeast Kre33 and human NAT10 are RNA cytosine acetyltransferases with, surprisingly, specificity toward both 18S rRNA and tRNAs. tRNA acetylation requires the intervention of a specific and conserved adaptor: yeast Tan1/human THUMPD1. In budding and fission yeasts, and in human cells, we found two acetylated cytosines on 18S rRNA, one in helix 34 important for translation accuracy and another in helix 45 near the decoding site. Efficient 18S rRNA acetylation in helix 45 involves, in human cells, the vertebrate-specific box C/D snoRNA U13, which, we suggest, exposes the substrate cytosine to modification through Watson–Crick base pairing with 18S rRNA precursors during small subunit biogenesis. Finally, while Kre33 and NAT10 are essential for pre-rRNA processing reactions leading to 18S rRNA synthesis, we demonstrate that rRNA acetylation is dispensable to yeast cells growth. The inactivation of NAT10 was suggested to suppress nuclear morphological defects observed in laminopathic patient cells through loss of microtubules modification and cytoskeleton reorganization. We rather propose the effects of NAT10 on laminopathic cells are due to reduced ribosome biogenesis or function.
Seed production varies from year-to-year in most species. Factors influencing this variation can include pollination and dispersal mechanisms, seed predation and resource availability. Here we examine a long-term (12– year) photographic record of seed cone production for the Australian endemic conifer Wollemia nobilis (Araucariaceae). Coefficient of variation (a commonly used measure of variation in seed production) was low for the two trees analysed, compared with published values for other polycarpic plants. Nevertheless, cone production decreased with increasing spring minimum temperatures (during pollination) and increased with summer total rainfall (during cone initiation). Hence, Wollemia nobilis cone production was correlated with weather, in line with the resource-matching hypothesis. Impacts of variation in cone production on the Wollemia nobilis population are likely to be buffered by the shade-tolerant, slow-growing juvenile life stage of Wollemia nobilis.
Writing Mystery and Mayhem
(2015)
This eighth anthology of twelve short stories from Weaver Press reveals again the range and variety, compassion and humour, irony and tragedy with which Zimbabwean writers observe the world around them. Several writers adopt a tongue-in-cheek approach to the subject: Naishe Nyamubaya takes us behind graphic newspaper headlines with a story of goblins, Jonathan Brakarsh turns the world inside out by constantly reversing our expectations, and Lawrence Hoba draws a situation both 'collateral and incompatible'. It is a characteristic of crime fiction to defy expectation, as Farai Mudzingwa, Bongani Sibanda and Valerie Tagwira do in exploring the ramifications of sudden death. But if we are surprised by some stories, we can only be moved those which draw on the pain and vulnerablity of both the victims and those left behind. Godess Bvukutwa, Isabella Matambanadzo and Donna Kirstein help us to reflect on injustice and loss. Reading this collection of stories, with subjects ranging from tokolosh to tsunami, and from ghosts to goldfish, reminds us that the world is crazier than we think.
Previous research on working memory (WM) in children with poor mathematical skills has yielded heterogeneous results, possibly due to inconsistent consideration of the IQ-achievement discrepancy and additional reading and spelling difficulties. To examine the impact of both, the WM of 68 average-achieving and 68 low-achieving third-graders in mathematics was assessed. Preliminary analyses showed that poor mathematical skills were associated with poor WM. Afterwards, children with isolated mathematical difficulties were separated from those with additional reading and spelling difficulties. Half of each group fulfilled the IQ-achievement discrepancy, resulting in a 2 (additional reading and spelling difficulties: yes/no) by 2 (IQ-achievement discrepancy: yes/no) factorial design. Analyses revealed that not fulfilling the IQ achievement discrepancy was associated with poor visual WM, whereas additional reading and spelling difficulties were associated with poor central executive functioning in children fulfilling the IQ-achievement discrepancy. Therefore, WM in children with poor mathematical skills differs according to the IQ-achievement discrepancy and additional reading and spelling difficulties.
Witch Girl
(2015)
This is modern Lusaka, Zambia, where the line between magic and religion is blurred, the arcane and the mundane muddle and nothing is what it seems. Luse is a sharp street child combing the gang-ridden city in a desperate search for Doctor Georgia Shapiro who she hopes can offer her a way back into her once-bright past. The doctor is trying to unravel the mystery of a friend's sudden death while attending to the AIDS crisis laying waste to the country around her. Meanwhile The Blood Of Christ Church and its enigmatic leader Priestess Selena Clark gain popularity with their murky promises of salvation and violent clandestine rituals. A small silver box links them in ways they cannot foretell. It will force Luse and Georgia to question who they trust, who they are and for whom they fight. Tanvi Bush's Witch girl is a crime thriller that juggles the past and the present effortlessly, blending AIDS activism, witchcraft, religious extremism and romance to create a well-paced narrative. Luse is so feisty, charming and resourceful that you'll miss her after you finish the book.