Continuous detection of viable micro-organisms by chemiluminescence

System monitors quality of reclaimed water continuously and automatically. Incubated samples are compared with unincubated ones by measuring their respective chemiluminescence

What really matters? The elusive quality of the material in feminist thought

The concept of the 'material' was the focus of much feminist work in the 1970s. It has always been a deeply contested one, even for feminists working within a broadly materialist paradigm of the social. Materialist feminists stretched the concept of the material beyond the narrowly economic in their attempts to develop a social ontology of gender and sexuality. Nonetheless, the quality of the social asserted by an expanded sense of the material - its 'materiality' - remains ambiguous. New terminologies of materiality and materialization have been developed within post-structuralist feminist thought and the literature on embodiment. The quality of 'materiality' is no longer asserted - as in materialist feminisms - but is problematized through an implicit deferral of ontology in these more contemporary usages, forcing us to interrogate the limits of both materialist and post-structuralist forms of constructionism. What really matters is how these newer terminologies of 'materiality' and 'materialization' induce us to develop a fuller social ontology of gender and sexuality; one that weaves together social, cultural, experiential and embodied practices

Organising for control: the Garment Workers' Union, The Indian Tailoring Section and the South African Clothing Workers' Union, 1928-1936

Paper presented at the Wits History Workshop: The Making of Class, 9-14 February, 198

Automated monitoring of recovered water quality

Laboratory prototype water quality monitoring system provides automatic system for online monitoring of chemical, physical, and bacteriological properties of recovered water and for signaling malfunction in water recovery system. Monitor incorporates whenever possible commercially available sensors suitably modified

Predicting the timing and potential of the spring emergence of overwintered populations of Heliothis spp

The current state of knowledge dealing with the prediction of the overwintering population and spring emergence of Heliothis spp., a serious pest of numerous crops is surveyed. Current literature is reviewed in detail. Temperature and day length are the primary factors which program H. spp. larva for possible diapause. Although studies on the interaction of temperature and day length are reported, the complete diapause induction process is not identified sufficiently to allow accurate prediction of diapause timing. Mortality during diapause is reported as highly variable. The factors causing mortality are identified, but only a few are quantified. The spring emergence of overwintering H. spp. adults and mathematical models which predict the timing of emergence are reviewed. Timing predictions compare favorably to observed field data; however, prediction of actual numbers of emerging moths is not possible. The potential for use of spring emergence predictions in pest management applications, as an early warning of potential crop damage, are excellent. Research requirements to develop such an early warning system are discussed

The 1952 Jan van Riebeeck tercentenary festival: constructing and contesting public national history

Paper presented at the Wits History Workshop: Myths, Monuments, Museums; New Premises? 16-18 July, 199

Sir Harry Smith and his imbongi: local and national identities in the Eastern Cape, 1952

Paper presented at the Wits History Workshop: Democracy, Popular Precedents, Practice and Culture, 13-15 July, 1994

"The Horse that made it all the way: towards a political biography of Issie Heymann"

Paper presented at the Wits History Workshop: Structure and Experience in the Making of Apartheid, 6-10 February, 1990

Support or control: The children of the Garment Workers' Union, 1939-1948

African Studies Seminar series. Paper presented March 1985Various historians have pointed out that during the first three decades of the twentieth century both capital and the state incorporated white wage earners in South Africa into institutionalised structures (1). The white workers lost all their militancy, developed a racist hierarchical division of labour, became entrapped in the hegemony of bourgeois politics and their trade unions slipped into the morass of bureaucracy. White workers, however, were not simply trapped by the state and capital. Incorporation was a process which took over twenty years or more to accomplish and was determined by specific conditions facing white workers and trade unions, in particular on the Witwatersrand, during this period. White workers rather eased themselves into a trap, lowered the gate, bolted it and threw away the key (2). There is one group of white workers which, it is maintained, managed to resist this incorporation: the clothing workers on the Witwatersrand in the 1930s and 40s. These workers were Afrikaner women who were active members of the Garment Workers' Union (GWU), a trade union which, it is claimed, under the leadership of Solly Sachs (its general secretary from 1928 to 1952), displayed a high degree of militancy, established internal democratic structures, assumed an independent political role and firmly committed itself to non-racialism (3). Perhaps the most important claim made on behalf of the union is the last for it has been used to justify many a theoretical position in the South African political arena. Solly Sachs himself used it to criticise the Communist Party's almost exclusive concern with black workers (4). Basil Davidson, writing in the New Statesman in 1950, wrote that the nonracialism in the Garment Workers' Union represented the hope that Afrikaners would forego their racialism and that black and white could co-operate in a future free South Africa (5). More recently Fine, de Clercq and Innes used the GWU's commitment to non-racialism as an example of how workers need not simply become incorporated into racial structures if trade unions registered under government sponsored legislation (6). All these assertions are based on an unquestioning acceptance of the Garment Workers' Union's official version of its stance towards black workers in the industry. The GWU always maintained that it welcomed blacks into its organisation, supported their struggles and through this assistance black workers acquired substantial benefits such as higher wages and shorter working hours (7). This paper will attempt to examine this rendition critically, looking particularly at the period 1939 to 1948, a time when black workers started entering the clothing industry on the Witwatersrand in significant numbers. However, we must first briefly survey the period 1929 to 1938 for in those years the roots of the GWU's policies towards black workers in the clothing industry were implanted (8)