Keeping the City Totally Clean: Yellow Fever and the Politics of Prevention in Colonial Saint-Louis-Du-Senegal, 1850-1914

This article explores the ways in which French colonial authorities met the life and death challenge. represented by the re-emergence of yellow fever epidemics in Saint-Louis-du-Senegal at a time when physicians knew very. little about the etiology, diagnosis, transmission and treatment of most infectious and parasitic diseases. The discussion focuses on changing strategies and policies designed to address yellow fever threats, the attitudes and priorities of the authorities, the limits of \u27colonial medicine\u27 and the responses of. people affected by sanitary measures. The article argues that because of the ignorance of the etiology and epidemiology of yellow fever, policies were misdirected and did not achieve their primary goals. Even after the introduction of germ theory, the gap between medical thinking and practice persisted for another decade. The African urban working class and underclass were the first victims of this state of affairs. The article also examines the conflict between the interests of public health, commerce and, privacy rights

Pandemic, plague, pestilence and the tropics: critical inquiries from arts, humanities and social sciences

The Tropics have long been associated with exotic diseases and epidemics. This historical imaginary arose with Aristotle’s notion of the tropics as the ‘torrid zone’, a geographical region virtually uninhabitable to temperate peoples due to the hostility of its climate, and persisted in colonial imaginaries of the tropics as pestilential latitudes requiring slave labour. The tropical sites of colonialism gave rise to urgent studies of tropical diseases which lead to (racialised) changes in urban planning. The Tropics as a region of pandemic, plague and pestilence has been challenged during the COVID-19 pandemic. The novel coronavirus did not (simply) originate in the tropics, nor have peoples of the tropics been specifically or exclusively infected. The papers collected in this Special Issue disrupt the imaginary of pandemics, plague and pestilence in association with the tropics through critical, nuanced, and situated inquiries from cultural history, ethnography, cultural studies, science and technology studies, Indigenous knowledge, philosophy, anthropology, urban studies, cultural geography, literature and film analyses, and expressed through distinctive academic articles, poetry and speculative fiction

Investigation of particles with high crack density produced by HPGR and its effect on the redistribution of the particle size fraction in heaps

The application of comminution technology such as the High-pressure grinding rolls (HPGR), which is able to generate a high density of cracks in the ore particles, is favourable for leaching processes. Extraction of metallic values by the heap leach process, can take place on the particles with partial exposure of mineral grains, if it can provide sufficient surface front for chemical attack by leaching solution. The aim of this study was to assess the benefits of high crack density in the ore particles produced using the HPGR and how it could diminish due to inadequate percolation of the leaching agent. A zinc ore was comminuted using HPGR at three different pressure settings and with a cone crusher for the control experiment. Subsamples from the (+23/-25, +14/-16, +5.25/-6.75 mm) size fractions were characterized and packed into leach reactors. The reactors were stopped from time to time to investigate the progress of crack and micro-crack growth and its effect on metal extraction using the X-ray computed tomography (CT). The results are validated with those obtained using traditional techniques such as SEM and QEMSCAN. Investigation of the leach reactors residue indicated significant changes in the particle size distribution (PSD) of initial feed toward the fine size fraction. The residues from the reactors leaching the material prepared using the HPGR product contained more fine particles than the reactors, which were fed by cone crusher product. These differences were up to 10.3%

Clinical and radiological features related to the growth potential of meningioma

Clinical and radiological features that help predict the growth potential of meningioma would be beneficial. The purpose of this study is to clarify the characteristics related to proliferating potential using the MIB-1 staining index. We analyzed the relationship of MIB-1 staining indices to characteristics of 342 consecutive patients with meningioma surgically removed between 1995 and 2004 by logistic regression analysis. One hundred and forty-nine of the patients with meningioma were ≥60 in age; 89 male; 48 recurrent; 203 symptomatic; 157 at the skull base; 124 over 20 cm(3); 24 multiple; 136 with edema; 117 with calcification. The MIB-1 staining index in 56 of 296 grade I meningiomas in WHO classification was ≥ 3.0; in 27 of 28 grade II; and in 17 of 18 grade III, respectively. Logistic regression analysis demonstrated that male (odds ratio [OR], 2.374, p=0.003), recurrence (OR, 7.574, p=0.0001), skull base (OR, 0.540, p=0.035), calcification (OR, 0.498, p=0.019) were independent risk factors for a high MIB-1 staining index (≥3.0); age, symptomatic, volume, multiple, edema were not. Male, recurrence, non-skull base, absence of calcification are independent risk factors for a high proliferative potential. These should be taken into consideration when managing meningiomas

Amplicon sequencing identified a putative pathogen, Macrophomina phaseolina, causing wilt in African eggplant (Solanum aethiopicum) grown in Tanzania and Uganda

African eggplant (Solanum aethiopicum L.) is one of the most common traditional vegetables in Tanzania and Uganda, but its productivity is severely affected by wilt diseases caused by a number of pathogens. Plant stem and root samples were collected in several fields from many neighboring diseased and healthy plants of the Gilo group in Tanzania and from the Shum group in Uganda to identify putative pathogens causing wilt on African eggplants. Through amplicon sequencing of sampled diseased and healthy tissues, we identified putative causal pathogens for the wilt symptoms. Wilting of S. aethiopicum in Uganda is most likely caused by the bacterial pathogen Ralstonia solanacearum whereas, in Tanzania, wilt is most likely caused by the fungal pathogen Macrophomina phaseolina, infecting roots. Infection of stems by Fusarium solani may also contribute to the wilt symptoms in Tanzania. Further artificial inoculation under controlled conditions confirmed that M. phaseolina can cause typical wilting symptoms on S. aethiopcium genotypes. The discovery of different putative causal agents of wilt in the crop demonstrates the need for site specific etiological analysis of wilt before developing and implementing effective control methods. Further research is needed to confirm the results and develop appropriate management measures against specific wilt pathogens

The global financial crisis and developing countries

When the global financial crisis broke out in earnest in September 2008, it quickly became clear that developing countries would also be affected, but that the impacts would vary markedly. The Overseas Development Institute (ODI) coordinated a multi-country study over January-March 2009 involving developing country teams in 10 countries. This showed that, while the transmission mechanisms were similar in each (trade, private capital flows, remittances, aid), the effects varied by country, and much was not yet visible. As such, further country-specific monitoring was required. Most findings suggested that, as a result of time lags, the worst effects were yet to come. This synthesis of the effects of the global financial crisis on developing countries updates the description of the economic and social situation during the course of the crisis in 11 countries