Pattern and rate of within-field dispersal and bionomics of the cowpea aphid, Aphis craccivora (Aphididae), on selected cowpea cultivars

Comparative field studies were conducted during the rainy and dry seasons at the Mbita Point Field Station of ICIPE in southwestern Kenya, to investigate the pattern and rate of dispersal of Aphis craccivora on aphid-resistant (ICV-12) and aphid-susceptible (ICV-1) cowpea cultivars in relation to key weather factors. The effects of the dispersal trends on crop performance and aphid population dynamics were analysed. Treatments consisted of initial aphid releases at the north, south, west, east and centre of test plots and uninfested controls maintained on plants for 22 days. Parameters recorded included: pattern (direction of spread of aphids) and rate (number of aphid-infested plants at a given time) in test plots; crop growth and yields and associated factors such as incidence of sooty mould and plant mortality, and aphid density and associated factors, including the incidence of natural enemy species, particularly coccinellids. Dispersal was fastest when releases were made in the west, north and centre of plots, and resulted in adveVse effects on ICV-1 growth and yields. Infestations of ICV-12 did not significantly affect crop performance. There was an apparent direct, positive relationship between wind direction and pattern of spread of aphid infestations, but this pattern was more apparent during the rainy season, when wind speeds were higher, than during the dry season. The incidence of natural enemy species correlated with the spread of aphid infestations, while the abundance of coccinellids correlated with aphid densit

Effects of infestation by cowpea aphid (Homoptera: Aphididae) on different growth stages of resistant and susceptible cowpea cultivars

Field studies were conducted to characterise the effects of infestations by adult and nymphal stages of cowpea aphid, Aphis craccivora Koch, on the growth and yield of cowpea, Vigna unguiculata (L.) Walp. Seedling, flowering, and podding stage plants of aphid-resistant (cv. ICV-12) and aphid-susceptible (cv. ICV-1) cowpea cultivars were used in the studies. Four treatments (consisting of infestations with adult and nymphal aphids, caged controls and uncaged controls) were administered on plants for 22 days post-treatment. Eight parameters of crop success were measured: extended leaf heights (ELH); plant mortality; incidence of sooty mould; incidence and abundance of natural enemy species; crop growth parameters (net assimilation rate, [NAR] in g/ dm2/day, and crop growth rate [CGR] in g/dm2 land surface/day); and plant yields (seeds per pod, weight per seed). Data were analysed using analysis of variance (ANOVA), orthogonal contrasts and 95% confidence intervals (C.I.). There were no significant (P > 0.05) differences between adult and nymphal infestations or between caged and uncaged controls, so the respective sets of data were combined for comparisons of aphid infestations with control treatments. Infestations caused severe plant stunting and other growth deformities, drastic yield reductions, higher plant mortality, greater incidence of natural enemies and abundance of Cheilomenes spp. on cv. ICV-1 than on cv. ICV-12, and on infested and uninfested plants. Aphid infestations did not significantly affect the incidence of sooty mould on plants of cv. ICV-12 or cv. ICV-

A Contactless IoT-Based GPS-Tracked Waste Bin to Curb Medical Waste Infections in Ghana

Irregular checking of waste especially in some medical facilities of Ghana leads to overflow of waste. A study by World Health Organisation (WHO) in February 2018 indicates that 15% of the total waste collected from medical facilities may be infectious, toxic, or radioactive and may contribute to unintended release of chemical or biological hazards. Considering the present COVID-19 pandemic and other diseases like ebola and hantavirus, it is critical to properly manage waste collected from medical facilities. In this study, Internet of Things (IoT) is used to design a smart bin to help reduce user contact to waste. Using a flowchart, a schematic model of the system was developed using Proteus 8.11 software. Two HCSR04 ultrasonic sensors were used to measure the waste level in the bin and detect proximity of objects to the bin to trigger an MG996R servo motor for automatic operation of the lid of the waste bin having a monitoring system. A NEO-6M GPS module was used to determine the location of the waste bin and displayed on a 16x2 LCD. A Graphical User Interface (GUI) was created for remote monitoring of waste over the internet. An ESP32 node MCU was programmed using Arduino software and used to interface the system with the GUI. The designed system was constructed and incorporated into a rectangular-shaped plastic bin. During testing, a hand wave at the sensor on the side of the container triggered opening of the bin. Sample waste placed in the bin were detected and real-time information regarding waste levels were sent to a self-designed HTML webpage called ‘Smart Bin’ with dynamic IP address. This system could be used in health facilities to prevent medical waste overflow, limit human contact to waste and avoid spread of infections

Blood Bank Practices for Sickle Cell Patients in North Carolina

Sickle cell disease (SCD) remains an important public health problem. Predominantly affecting African Americans, SCD is associated with significant health, financial, and psychosocial costs. Therefore, it is vital to find new ways to improve delivery of care to this patient population. The hospital blood bank plays a key role in delivering transfusion therapy to SCD patients. Because transfusion therapy represents the mainstay of treatment for most SCD patients, we hypothesized that a systematic review of blood bank practices for these patients might uncover new opportunities to improve this care. Current blood bank practices for SCD patient have not been previously described. This paper discusses blood bank practices for SCD patients in North Carolina. The layout is as follows. First, the underlying cause, history, and costs of sickle cell disease are described. Next, evidence supporting the use of transfusions for SCD management and its associated risks are considered. Data from a crosssectional study of NC blood bank practices for SCD patients are then presented. Finally, the significance and implications of this research are discussed.Master of Public Healt

Exploring Perceptions of Customer Value: The Role of Corporate Social Responsibility Initiatives in the European Telecommunications Industry

Purpose - This paper develops a framework that describes and explains how corporate social responsibility (CSR) initiatives are perceived by customers and links customer perception to the notion of customer value perception. In order to explore customer value conception firstly, the perception of CSR initiatives is investigated; secondly, indications for the value enhancing effects of CSR initiatives are studied, and finally, the varying effects which different value categories can have on customer attitudes and behaviour are extracted. Design/methodology/approach - The data consists of twelve semi-structured interviews with customers of European telecommunication companies. Findings - The results suggest that CSR initiatives, when communicated efficiently and considered as relevant by customers, will in the main enhance two customer value categories: (1) the extrinsic self-oriented value defined as efficiency and excellence and (2) the intrinsic other-oriented value pertaining to ethics or spirituality. Enhancement of extrinsic selforiented value imbeds the potential of CSR initiatives to affect customers’ purchase behaviour and thus strengthen ethical consumerism within the telecommunications industry. Research limitations/implications – The main implication for research is a better understanding of the relationship between customer perception and customer value perception in the field of ethical consumerism. Focusing on one industry for the study can be named as a limitation. Practical implications – As indicated by the research results by customers prioritised CSR initiative can affect the customer value perception, mainly the extrinsic/self-oriented value. If the company is aiming to change customer behaviour and to strengthen ethical consumerism, it is important that the customer experience of CSR initiatives improve excellence (quality) and/or efficiency of the product/service. Originality/value – This paper fulfils an identified need of research on how CSR initiatives can influence consumer behaviour

Stylet Penetration Activities by Aphis craccivora (Homoptera: Aphididae) on Plants and Excised Plant Parts of Resistant and Susceptible Cultivars of Cowpea (Leguminosae)

Direct current electrical penetration graphs (DC-EPGs) were used to analyze the stylet penetration activities of cowpea aphid, Aphis craccivora Koch, on plants of aphid-resistant (ICV-12) and aphid-susceptible (ICV-1) cultivars of cowpea, Vigna unguiculata (L.) Walpers. Aphid stylet penetration on whole plants at seedling, flowering, and podding stages were studied in one experiment, and in another experiment excised leaves from seedling plants, excised flowers, and excised pods were tested. Electrical signals depicting the aphid stylet penetration activities on their host plants were amplified, recorded onto a paper chart recorder, and scored for specific waveform patterns. Compared with similar tissues of ICV-1, intact leaves and excised seedling foliage of ICV-12 plants caused severe disruption of aphid stylet penetration activities. This was manifested in frequent penetration attempts that were abruptly terminated or unsustained, and in shorter penetration times, signifying antixenosis resistance in ICV-12. There was reduced occurrence of E waveforms, which represent stylet activity in plant vascular tissues. Also, prior exposure of test aphids to plants of one cultivar did not significantly influence the expected stylet penetration activities on plants of the other cultivar. Overall, ICV-12 exhibited high levels of resistance against A. craccivor

Civil society, peacebuilding from below and shrinking civic space: the case of Cameroon’s ‘Anglophone’ conflict

This article focuses on the current conflict in Anglophone Cameroon and examines the role of civil society organisations (CSOs) in conflict resolution. In doing so, it explores a paradox in the peacebuilding literature. On the one hand, the ‘local turn’ in peacebuilding has emphasised a bottom-up approach that highlights the role of CSOs. On the other hand, the literature on ‘shrinking civic space’ has demonstrated how space for CSOs’ activities has become increasingly restricted, especially in authoritarian contexts like Cameroon. The article investigates the contributions of CSOs to conflict resolution, the constraints faced, and their responses in turn to mitigate such constraints. CSOs’ contribution to conflict resolution is at least three-fold: to engage with most-affected communities and build an evidence base of the conflict’s adverse consequences for civilians; to draw national and international attention to the conflict; and to maintain pressure for a negotiated settlement through public protests and interactions with both government and non-state armed groups. Despite facing intimidation and violence at times, CSOs have responded in innovative ways that demonstrate examples of adaptation and resistance to shrinking civic space

Observable implications of geometrical and dynamical aspects of freeze-out in heavy ion collisions

Using an analytical parameterization of hadronic freeze-out in relativistic heavy ion collisions, we present a detailed study of the connections between features of the freeze-out configuration and physical observables. We focus especially on anisotropic freeze-out configurations (expected in general for collisions at finite impact parameter), azimuthally-sensitive HBT interferometry, and final-state interactions between non-identical particles. Model calculations are compared with data taken in the first year of running at RHIC; while not perfect, good agreement is found, raising the hope that a consistent understanding of the full freeze-out scenario at RHIC is possible, an important first step towards understanding the physics of the system prior to freeze-out.Comment: 36 pages, 56 figures, 2 tables; version accepted for publication in PRC: some figures, references and discussion added; now also discusses classical versus quantum statistic