2,617 research outputs found
Downsizing as a Strategic Tool for Effective Organizational Management: A Case Study of Nigerian Banks
Downsizing, in recent years, have assumed a commonplace in various organisations. The views of various practitioners and in fact results of various studies indicates that these initiatives, albeit, intended to produce positive results, often do more harm than good to some organisations, workforce and their performance. The unending quest for lower costs, higher productivity and fatter profits have often led to the wielding of the ‘’big stick’’. Organisations of varying sizes and shapes have used downsizing as a cost cutting management strategy, however, the untold stories are the actual cost of these exercise to the organisation, performance and it’s far reaching implications to the workforce. This paper explored the costs and implications of the massive wave of redundancies in the workforce in Nigerian banks. With the help of data obtained from open-ended interviews conducted with various stakeholders in downsizing operations and applied within a clinical framework, individual reaction patterns are explored in the victims, the survivors and the executioners. Among the victims and survivors within the Nigerian setting, a number of ways of coping can be discerned, and described as compulsive, abrasive, dissociate and depressive. Findings revealed a plethora of mixed feelings among various employees and expose the far reaching implications both to the organisations, affected individuals (victims) and the psyche of their co-workers (survivors). The article ends with a number of practical recommendation
Draft genome sequences of seven isolates of Phytophthora ramorum EU2 from Northern Ireland
Here we present draft-quality genome sequence assemblies for the oomycete Phytophthora ramorum genetic lineage EU2. We sequenced genomes of seven isolates collected in Northern Ireland between 2010 and 2012. Multiple genome sequences from P. ramorum EU2 will be valuable for identifying genetic variation within the clonal lineage that can be useful for tracking its spread
Ovarian Cancers Harbour Defects in Non-Homologous End Joining Resulting in Resistance to Rucaparib
Abstract
Purpose: DNA damage defects are common in ovarian cancer and can be used to stratify treatment. Although most work has focused on homologous recombination (HR), DNA double-strand breaks are repaired primarily by nonhomologous end joining (NHEJ). Defects in NHEJ have been shown to contribute to genomic instability and have been associated with the development of chemoresistance.
Experimental Design: NHEJ was assessed in a panel of ovarian cancer cell lines and 47 primary ascetic-derived ovarian cancer cultures, by measuring the ability of cell extracts to end-join linearized plasmid monomers into multimers. mRNA and protein expression of components of NHEJ was determined using RT-qPCR and Western blotting. Cytotoxicities of cisplatin and the PARP inhibitor rucaparib were assessed using sulforhodamine B (SRB) assays. HR function was assessed using γH2AX/RAD51 foci assay.
Results: NHEJ was defective (D) in four of six cell lines and 20 of 47 primary cultures. NHEJ function was independent of HR competence (C). NHEJD cultures were resistant to rucaparib (P = 0.0022). When HR and NHEJ functions were taken into account, only NHEJC/HRD cultures were sensitive to rucaparib (compared with NHEJC/HRC P = 0.034, NHEJD/HRC P = 0.0002, and NHEJD/HRD P = 0.0045). The DNA-PK inhibitor, NU7441, induced resistance to rucaparib (P = 0.014) and HR function recovery in a BRCA1-defective cell line.
Conclusions: This study has shown that NHEJ is defective in 40% of ovarian cancers, which is independent of HR function and associated with resistance to PARP inhibitors in ex vivo primary cultures. Clin Cancer Res; 23(8); 2050–60. ©2016 AACR.</jats:p
Prostate Stereotactic Ablative Radiation Therapy Using Volumetric Modulated Arc Therapy to Dominant Intraprostatic Lesions
PurposeTo investigate boosting dominant intraprostatic lesions (DILs) in the context of stereotactic ablative radiation therapy (SABR) and to examine the impact on tumor control probability (TCP) and normal tissue complication probability (NTCP).Methods and MaterialsTen prostate datasets were selected. DILs were defined using T2-weighted, dynamic contrast-enhanced and diffusion-weighted magnetic resonance imaging. Four plans were produced for each dataset: (1) no boost to DILs; (2) boost to DILs, no seminal vesicles in prescription; (3) boost to DILs, proximal seminal vesicles (proxSV) prescribed intermediate dose; and (4) boost to DILs, proxSV prescribed higher dose. The prostate planning target volume (PTV) prescription was 42.7 Gy in 7 fractions. DILs were initially prescribed 115% of the PTVProstate prescription, and PTVDIL prescriptions were increased in 5% increments until organ-at-risk constraints were reached. TCP and NTCP calculations used the LQ-Poisson Marsden, and Lyman-Kutcher-Burman models respectively.ResultsWhen treating the prostate alone, the median PTVDIL prescription was 125% (range: 110%-140%) of the PTVProstate prescription. Median PTVDIL D50% was 55.1 Gy (range: 49.6-62.6 Gy). The same PTVDIL prescriptions and similar PTVDIL median doses were possible when including the proxSV within the prescription. TCP depended on prostate α/β ratio and was highest with an α/β ratio = 1.5 Gy, where the additional TCP benefit of DIL boosting was least. Rectal NTCP increased with DIL boosting and was considered unacceptably high in 5 cases, which, when replanned with an emphasis on reducing maximum dose to 0.5 cm3 of rectum (Dmax0.5cc), as well as meeting existing constraints, resulted in considerable rectal NTCP reductions.ConclusionsBoosting DILs in the context of SABR is technically feasible but should be approached with caution. If this therapy is adopted, strict rectal constraints are required including Dmax0.5cc. If the α/β ratio of prostate cancer is 1.5 Gy or less, then high TCP and low NTCP can be achieved by prescribing SABR to the whole prostate, without the need for DIL boosting
Allergic sensitisation in South Africa : allergen-specific ige-component testing (ISAC)
BACKGROUND : Allergic sensitisation patterns differ globally; therefore it is important to understand local South African
sensitisation patterns to inhalant and food allergen components to enable clinicians to diagnose and manage South
African patients appropriately.
METHODS : A retrospective study was conducted reviewing component allergen testing data from a private laboratory
provider in South Africa over a two-year period. Data generated from all Immuno Solid-phase Allergen Chip (ISAC) tests
referred from all regions in South Africa were collected and analysed according to the allergen-component positivity rate.
RESULTS : A total of 813 consecutive patients were tested for allergen-component sensitisation by ISAC testing. Data were
assessed to determine the most prevalent sensitisation patterns for inhalant, food and cross-reactive allergen components.
The most frequent inhalant allergen components were Bermuda grass (Cyn d 1) and Timothy grass (Phl p 1), followed by cat
uteroglobin (Fel d 1) and house-dust mite (HDM) (Der f 1). Peanut (Ara h 2), shrimp (Pen m 2) and egg white (Gal d 1) were
the most prevalent food-component allergens. The most common pollen–food cross-reactive allergen components were
cross-reactive carbohydrate determinant (CCD), profilin and thaumatin-like protein (pathogenesis-related protein (PR-5)).
CONCLUSIONS : Grass pollen components were identified as the most common inhalant allergen sensitiser. The most
common pollen–food cross-reactive component sensitisation was to CCD, which is in keeping with the high level of grass
pollen sensitisation. HDM-component sensitisation was lower than expected when correlated with previous studies using
whole allergen specific IgE sensitisation data. This study contributes to understanding allergen sensitisation patterns in
South Africa by adding component sensitisation data to the current diagnostic knowledge pool; and it raises awareness
of the extent of allergen-component cross-reactivity in South Africa.https://journals.co.za/journal/caciam2023Paediatrics and Child Healt
Eff ectiveness of reactive oral cholera vaccination in rural Haiti: a case-control study and bias-indicator analysis
Background Between April and June, 2012, a reactive cholera vaccination campaign was done in Haiti with an oral
inactivated bivalent whole-cell vaccine. We aimed to assess the eff ectiveness of the vaccine in a case-control study and
to assess the likelihood of bias in that study in a bias-indicator study.
Methods Residents of Bocozel or Grand Saline who were eligible for the vaccination campaign (ie, age ≥12 months,
not pregnant, and living in the region at the time of the vaccine campaign) were included. In the primary case-control
study, cases had acute watery diarrhoea, sought treatment at one of three participating cholera treatment units, and
had a stool sample positive for cholera by culture. For each case, four control individuals who did not seek treatment
for acute watery diarrhoea were matched by location of residence, enrolment time (within 2 weeks of the case), and
age (1–4 years, 5–15 years, and >15 years). Cases in the bias-indicator study were individuals with acute watery
diarrhoea with a negative stool sample for cholera. Controls were selected in the same manner as in the primary
case-control study. Trained staff used standard laboratory procedures to do rapid tests and stool cultures from study
cases. Participants were interviewed to collect data on sociodemographic characteristics, risk factors for cholera, and
self-reported vaccination. Data were analysed by conditional logistic regression, adjusting for matching factors.
Findings From Oct 24, 2012, to March 9, 2014, 114 eligible individuals presented with acute watery diarrhoea and were
enrolled, 25 of whom were subsequently excluded. 47 participants were analysed as cases in the vaccine eff ectiveness
case-control study and 42 as cases in the bias-indicator study. 33 (70%) of 47 cholera cases self-reported vaccination
versus 167 (89%) of 188 controls (vaccine eff ectiveness 63%, 95% CI 8–85). 27 (57%) of 47 cases had certifi ed
vaccination versus 147 (78%) of 188 controls (vaccine eff ectiveness 58%, 13–80). Neither self-reported nor verifi ed
vaccination was signifi cantly associated with non-cholera diarrhoea (vaccine eff ectiveness 18%, 95% CI –208 to 78 by
self-report and –21%, –238 to 57 by verifi ed vaccination).
Interpretation Bivalent whole-cell oral cholera vaccine eff ectively protected against cholera in Haiti from 4 months to
24 months after vaccination. Vaccination is an important component of eff orts to control cholera epidemics
Differential adaptation of Candida albicans in vivo modulates immune recognition by dectin-1
Author Summary Dectin-1 is a pattern recognition receptor recognising the fungal cell-wall component, β-glucan, and plays an essential role in controlling C. albicans infections in both mouse and man. Candida albicans is part of the normal human microflora, yet is capable of causing superficial mucosal infections as well as life-threatening invasive diseases, particularly in patients whose immune function is compromised. Here we found that the contribution of Dectin-1 is limited to specific strains of C. albicans ; effects which are due to the differential adaptation of these pathogens during infection. Importantly, C. albicans strains showed variations in both the composition and nature of their cell walls, and it was these differences which influenced the role of Dectin-1. Crucially, we found that we could alter the fungal cell wall, and subsequent interactions with the host, using antifungal drugs. These findings have substantial implications for our understanding of the factors contributing to human susceptibility to infections with C. albicans , but also treatment strategies
SeqCode: a Nomenclatural Code for Prokaryotes described from Sequence Data
Most prokaryotes are not available as pure cultures and therefore ineligible for naming under the rules and recommendations of the International Code of Nomenclature of Prokaryotes (ICNP). Here we summarize the development of the SeqCode, a code of nomenclature under which genome sequences serve as nomenclatural types. This code enables valid publication of names of prokaryotes based upon isolate genome, metagenome-assembled genome or single-amplified genome sequences. Otherwise, it is similar to the ICNP with regard to the formation of names and rules of priority. It operates through the SeqCode Registry (https://seqco.de/), a registration portal through which names and nomenclatural types are registered, validated and linked to metadata. We describe the two paths currently available within SeqCode to register and validate names, including Candidatus names, and provide examples for both. Recommendations on minimal standards for DNA sequences are provided. Thus, the SeqCode provides a reproducible and objective framework for the nomenclature of all prokaryotes regardless of cultivability and facilitates communication across microbiological disciplines
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