South African Journal of Science最新文献_第3页

Response to Brand et al. (2022) ‘Data sharing governance in sub-Saharan Africa during public health emergencies’ 对 Brand 等人（2022 年）"公共卫生突发事件期间撒哈拉以南非洲的数据共享管理 "的回应

IF 2.4 4区综合性期刊

South African Journal of Science Pub Date : 2023-11-29 DOI: 10.17159/sajs.2023/15722

D. Thaldar, Lukman Abdulrauf, Paul Ogendi, Amy Gooden, D. Donnelly, B. Townsend

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Sutherland big telescope: Further opportunities for effective science engagement? 萨瑟兰大望远镜：有效科学参与的更多机会？

IF 2.4 4区综合性期刊

South African Journal of Science Pub Date : 2023-11-29 DOI: 10.17159/sajs.2023/15296

Thembela Mantungwa, L.J. Theo

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Academic Publishing 101: The SAJS monthly Journal Writing and Peer Review Forum 学术出版 101：SAJS 每月期刊写作与同行评审论坛

IF 2.4 4区综合性期刊

South African Journal of Science Pub Date : 2023-11-29 DOI: 10.17159/sajs.2023/15753

Jemma M. Finch

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SNP-based marker-assisted selection for high provitamin A content in African cassava genetic background 基于 SNP 标记辅助选择非洲木薯基因背景中的高维生素 A 含量

IF 2.4 4区综合性期刊

South African Journal of Science Pub Date : 2023-11-29 DOI: 10.17159/sajs.2023/15115

Esperance D. Codjia, B. Olasanmi, Chike E. Ugoji, I. Rabbi

{"title":"SNP-based marker-assisted selection for high provitamin A content in African cassava genetic background","authors":"Esperance D. Codjia, B. Olasanmi, Chike E. Ugoji, I. Rabbi","doi":"10.17159/sajs.2023/15115","DOIUrl":"https://doi.org/10.17159/sajs.2023/15115","url":null,"abstract":"Vitamin A deficiency (VAD) contributes to significant levels of mortality and morbidity, particularly among children and women in Africa. Cassava is a major staple crop whose biofortification with betacarotene can contribute to reducing the VAD prevalence in a cost-effective and sustainable approach. Developing high provitamin A content (pVAC) cassava varieties through the conventional approach is a laborious and slow process, partly due to the breeding bottlenecks caused by the biology of the crop. To complement the phenotypic screening for pVAC and increase selection efficiency as well as accuracy, we employed four Kompetitive Allele-Specific PCR (KASP) assays to predict the level of carotenoids in a cassava population developed from open-pollinated crosses. There was significant correlation (r = 0.88) between total carotenoid content (TCC) and root tissue colour score in the study population. Marker S1_24155522 at the phytoene synthase gene explained most of the phenotypic variation in TCC and root colour (R2 = 0.37 and 0.55, respectively) among the genotypes evaluated in this study. The other markers did not individually account for much phenotypic variation in the trait in our study population. Three genotypes – namely UIC-17-679, UIC-17-1713, and UIC-17-2823 – had higher TCCs, ranging from 10.07 μg/g to 10.88 μg/g, than the national yellow check variety IITA-IBA-TMS070593 (9.20 μg/g). Marker PSY572/S124155522 is therefore recommended for routine use in marker-assisted selection for pVAC enhancement in African cassava germplasm.","PeriodicalId":21928,"journal":{"name":"South African Journal of Science","volume":"17 1","pages":""},"PeriodicalIF":2.4,"publicationDate":"2023-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139213000","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"综合性期刊","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

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Understanding human health in relation to the global political economy 了解人类健康与全球政治经济的关系

4区综合性期刊

South African Journal of Science Pub Date : 2023-09-28 DOI: 10.17159/sajs.2023/15870

Jonathan Jansen

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South African school shoes: Urgent changes required for our children’s unique feet 南非学校的鞋子:迫切需要改变我们孩子独特的脚

4区综合性期刊

South African Journal of Science Pub Date : 2023-09-28 DOI: 10.17159/sajs.2023/16295

Marise C. Breet, Johanna E. de Villiers, Ranel Venter

引用次数: 0

Effect of manganese-rich solid waste on soil phosphorus availability applied as monopotassium and rock phosphate in two contrasting soils 富锰固体废物在两种对照土壤中作为单钾和磷酸盐岩施用对土壤磷有效性的影响

4区综合性期刊

South African Journal of Science Pub Date : 2023-09-28 DOI: 10.17159/sajs.2023/15689

Mohammed A. Elsheikh, Khatab Abdalla, Louis Titshall, Pardon Muchaonyerwa

{"title":"Effect of manganese-rich solid waste on soil phosphorus availability applied as monopotassium and rock phosphate in two contrasting soils","authors":"Mohammed A. Elsheikh, Khatab Abdalla, Louis Titshall, Pardon Muchaonyerwa","doi":"10.17159/sajs.2023/15689","DOIUrl":"https://doi.org/10.17159/sajs.2023/15689","url":null,"abstract":"Manganese (Mn) mining produces a large amount of Mn-rich solid waste contributing to soil and groundwater pollution. Adding Mn-rich waste to soils could reduce mining pollution by allowing specialised plants to take up this mineral for growth, that is, phytoremediation. However, Mn interacts with other soil major and trace minerals. The interaction with phosphorus (P), a key element for plant nutrition and growth, has received less attention. In this study, we aimed to evaluate the effects of P sources (i.e. rock phosphate and monopotassium [KH2PO4]) and application rates on the P and Mn relationships in clay and sandy soils mixed with Mn-rich waste. Soils differing in texture were incubated for 60 days at room temperature (±20 °C), and changes in available P, Mn and soil pH were determined at 0, 30 and 60 days. The addition of Mn-rich solid waste significantly decreased available soil P in both soils with the greatest reduction of 62% and 52% from the sandy soil subjected to KH2PO4 and rock phosphate, respectively. In the clayey soil, the reduction was higher for the rock phosphate source implying more P was released from the rock phosphate in Mn-rich soils. This explanation was supported by the significant positive correlation between P and Mn for both soils when P is added in the form of rock phosphate. Our results suggest that Mn-rich waste is better in clay soils subjected to rock phosphate addition. Further research is needed to control Mn solid waste pollution levels in soils using specific crops with known phytoremediation properties.","PeriodicalId":21928,"journal":{"name":"South African Journal of Science","volume":"58 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135343343","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"综合性期刊","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Quantification of toxic metals in cropland soil using X-ray fluorescence 用x射线荧光定量测定农田土壤中的有毒金属

4区综合性期刊

South African Journal of Science Pub Date : 2023-09-28 DOI: 10.17159/sajs.2023/15008

Mashinga J. Mvelase, Paulus L. Masiteng

引用次数: 0

Concentrations of lead in ceramic tableware in South Africa 南非陶瓷餐具中铅的浓度

4区综合性期刊

South African Journal of Science Pub Date : 2023-09-28 DOI: 10.17159/sajs.2023/13853

Angela Mathee, Louise Renton, Renée Street

引用次数: 0

From waste cooking oil to oxygen-rich onion-like nanocarbons for the removal of hexavalent chromium from aqueous solutions 从废食用油到富氧洋葱状纳米碳用于去除水溶液中的六价铬

4区综合性期刊

South African Journal of Science Pub Date : 2023-09-28 DOI: 10.17159/sajs.2023/14006

Themba D. Ntuli, Ludwe L. Sikeyi, Thomas H. Mongwe, Orlette Mkhari, Neil J. Coville, Edward N. Nxumalo, Manoko S. Maubane-Nkadimeng

{"title":"From waste cooking oil to oxygen-rich onion-like nanocarbons for the removal of hexavalent chromium from aqueous solutions","authors":"Themba D. Ntuli, Ludwe L. Sikeyi, Thomas H. Mongwe, Orlette Mkhari, Neil J. Coville, Edward N. Nxumalo, Manoko S. Maubane-Nkadimeng","doi":"10.17159/sajs.2023/14006","DOIUrl":"https://doi.org/10.17159/sajs.2023/14006","url":null,"abstract":"Vegetable cooking oil is used in domestic and commercial kitchens owing to its ability to modify and enhance the taste of the food through the frying process. However, as the oil is used through several frying cycles, it changes colour to dark brown and acquires an unpleasant smell. At this point, the waste oil is usually discarded, thereby finding its way into freshwater streams due to poor disposal and thus becoming an environmental pollutant. To provide an alternative, ‘green’ route to waste oil disposal, herein we report on the metal-free synthesis of onion-like nanocarbons (OLNCs) made from waste cooking oil via flame pyrolysis. The OLNCs were then applied in the removal of hexavalent chromium ions from aqueous solutions. The as-synthesised OLNCs were found to have similar properties (size, quasi-spherical shape etc.) to those synthesised from pure cooking oils. The Fourier-transform infrared spectroscopy data showed that the OLNCs contained C-O-type moieties which were attributed to the oxygenation process that took place during the cooking process. The OLNCs from waste oil were applied as an adsorbent for Cr(VI) and showed optimal removal conditions at pH = 2, t = 360 min, Co = 10 mg/L and Q0max = 47.62 mg/g, superior to data obtained from OLNCs prepared from pristine cooking oil. The results showed that the OLNCs derived from the waste cooking oil were effective in the removal of hexavalent chromium. Overall, this study shows how to repurpose an environmental pollutant (waste cooking oil) as an effective adsorbent for pollutant (Cr(VI)) removal.","PeriodicalId":21928,"journal":{"name":"South African Journal of Science","volume":"96 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135385107","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"综合性期刊","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0