•Coal mining activities are being carried out in Moatize district, Tete province, Mozambique.•The impact of coal mining on the surrounding environment were evaluated.•Surface water and groundwater ...were contaminated with As, Cr, Cu, Ni, Mn and Pb.•As, Cd, Cr, Mn and Pb release from the surrounding surface soils and river sediments exceeded environmental standards.
Water, soils, and sediments contaminated with hazardous elements are of increasing concern because they greatly affect human health and ecological systems. In Mozambique, coal mining and processing operations are important industries; however, they could potentially contaminate the surrounding environment. This study investigates contamination of surface soils, river sediments, river water and groundwater around coal mines in Moatize district, Tete province, Mozambique. Three water pollution indices, water quality index (WQI), heavy metal evaluation index (HEI) and heavy metal pollution index (HPI) and five soil/sediment pollution indices, enrichment factor (EF), geo-accumulation index (Igeo), contamination factor (CF), contamination degree (CD) and pollution load index (PLI) were used to assess the levels of contamination in the area. All water samples were found to be “uncontaminated” to “moderately contaminated” with hazardous metals. The heavy metal concentrations found in waters varied from: As (0.3–10.9 µg/L), Ba (9.8–69.6 µg/L), Cr (2.1–60.2 µg/L), Cu (1.7–62.3 μg /L), Ni (1.2–71.9 μg /L), Mn (5.9–58.1 µg/L), Pb (1.3–10.8 μg /L) and Zn (2.1–40.2 µg/L). Most of these values exceeded the drinking water standards set by WHO. Meanwhile, surface soils and sediments from Moatize and Murrongoze Rivers were “highly polluted” (PLI = 1.11–1.85). Leaching experiments of soil and sediments suggest that hazardous elements from soils and sediments were strongly affected by the type of leaching solution (deionized 18 MΩ cm water and 1M HCl) and several of them were highly bio-accessible that could pose serious ecological and health risks in the area.
•Maximum depositional age of the arc-related Chidzolomondo Complex at 1120 Ma.•Syn-orogenic charnockite and gabbro dated at 1097 Ma and 1061 Ma, respectively.•HT-LP syn-orogenic metamorphism between ...1092 and 1060 Ma.•Thermal metamorphism due to the late-orogenic charnockite intrusion at 1026 Ma.
In the Mesoproterozoic Southern Irumide Belt, Tete Province, NW Mozambique, granulite-facies metavolcaniclastic rocks and orthogneisses from the Chidzolomondo Complex provide new constraints on the subduction and accretionary phases of the belt evolution. The complex comprises a metavolcano-sedimentary succession intruded by syn- to post-orogenic granitoids, charnockites and gabbros. The paragneisses exhibit a calc-alkaline chemical composition akin to intermediate magmatic rocks found in volcanic arcs. They are interpreted as products of a three-component mixture, consisting of pelite-aluminous, quartz, and reworked mafic volcanic rocks. A paragneiss sample contains detrital zircon with ages mainly between 1344 and 1098 Ma and εHf(t) values between −10 to +7, defining a maximum depositional age of 1121 ± 2 Ma. A charnockitic gneiss, dated at 1097 ± 3 Ma, and a metagabbro, dated at 1061 ± 3 Ma, respectively, represent the syn- and late-orogenic magmatic events. Both rocks exhibit juvenile εHf(t) signatures ranging from +1.5 to +4.5. The mineral assemblage of cordierite + garnet + orthopyroxene in metavolcaniclastic rocks, and plagioclase + hypersthene + diopside in the metagabbro, provide evidence of the HT-LP metamorphic conditions. Phase equilibria modeling of a paragneiss indicates that the peak metamorphic conditions reached approximately 785–795 °C and 3.7–4.2 kbar. By dating of zircon overgrowths in granulite-facies gneisses, we characterized the orogenic (M1) and thermal (M2) metamorphisms that affected the complex. The M1 event records the subduction-type and accretion metamorphism dated between 1092 and 1060 Ma. The M2 event, identified in the metagabbro sample close to the contact with a charnockite intrusion, yielded an age of 1023 ± 12 Ma for the thermal metamorphism. Intrusive charnockite and a gabbro record the post-orogenic magmatism with ages of 1026 ± 4 Ma and 1026 ± 12 Ma, respectively. The results provide a timeline for the last orogenic events of the Southern Irumide Belt, including the maximum depositional age of the Chidzolomondo Complex at ca. 1120 Ma, syn-orogenic magmatism and metamorphism until ca. 1060 Ma, and late- to post-orogenic magmatism and metamorphism between 1050 and 1020 Ma.
A crise da sociedade moderna aconselha os/as investigadores/as a não se limitarem à explicação dos factos, mas a assumirem um papel de intervenção social na construção de identidades e de sentidos. ...Este estudo pretende debater o papel do/a investigador/a na formação de cidadanias ativas e engajadas em Tete (Moçambique), adotando como referência o conceito de “ cidadania sustentável”. Por um lado, a crise social desperta a necessidade de uma intervenção cidadã local e de uma valorização de saberes tradicionais no que podemos considerar o reconhecimento de um quadro identitário e epistemológico em que, sem perder o sentido do global, se tenha em atenção as realidades locais. O trabalho assume-se como de reflexão teórica, suportado por um conjunto de dados empíricos, em que se procura olhar para o/a investigador/a como pessoas que buscam o sentido da cidadania, com vista a uma prática engajada, no tempo e no espaço em que lhe cabe trabalhar.
•Vale's 16-years presence in Mozambique produced contradictory perceptions among civil society organizations, government officers and private sector representatives.•The implantation of Vale's mining ...plant in Moatize resulted in a temporary local economic boom in Tete, the town became an imaginary place plenty of riches, but early such imagination was substituted by a generalized frustration.•The replacement of Vale by Vulcan has not stopped the conflicts between the local community and the mining companies as there have not been any improvement in the living conditions.
Vale's 16-years presence in Mozambique produced contradictory perceptions among civil society organisations, government officers and private sector representatives. The implantation of Vale's mining plant in Moatize resulted in a temporary local economic boom in Tete; the town became an imaginary place plenty of riches, but early such imagination was substituted by a generalized frustration. The replacement of Vale by Vulcan has not stopped the conflicts between the local community and the mining companies as there have not been any improvement in the living conditions.
The quality of the health services offered are very important to guarantee access to quality health and promote well-being for all, at all ages, as recommended in the Sustainable Development Goals ...2030. This study aims to assess the degree of satisfaction of users of the Occupational Health Service of the Tete Provincial Hospital. A cross-sectional study was conducted. The data was collected between September 15
and December 20
, 2022, for 335 participants through a self-administered questionnaire. Descriptive statistics was used to describe the data. Overall satisfaction was 87.5% (293/335). Participants age, gender, marital status, and level of education were associated with overall satisfaction (p < 0.001). The factors that influence the satisfaction of users of the Occupational Health Service were the cleanliness of the hospital, opening hours, ease of care, speed and waiting time. The satisfaction of users of the Occupational Health Service of the Tete Provincial Hospital was high.
The synthesis and the structural characterization of the tellurolate–palladium complexes PdCl(μ-TePh)PPh2Py2 and PdCl(μ-TePh)PPh32 are described. Although no PdPd interactions were observed, the ...tellurium atoms attain secondary bonds with a covalent character.
Bis(diphenyl-2-pyridylphosphine)palladium(II) dichloride and bis(triphenylphosphine)palladium(II) dichloride react with (PhTe)2Hg in THF to give the binuclear complexes with tellurolate bridges PdCl(μ-TePh)PPh2Py2 (1) (Ph=phenyl; Py=2-pyridyl) and PdCl(μ-TePh)PPh32 (2). Although no PdPd interactions were observed, the tellurium atoms in both complexes attain secondary bonds with a covalent character.
In July 2018, a virus (JXLC1806-2) was isolated from
biting midges collected in Lichuan County, Jiangxi Province, China. The virus isolate showed significant cytopathic effects within 48 hours after ...inoculation with mammalian cells (BHK-21). JXLC1806-2 virus could form plaques in BHK-21 cells, and the virus titer was 1×10
pfu/mL. After inoculation with the virus, suckling mice developed disease and died. The nucleotide and amino sequence analysis showed that the JXLC1806-2 virus genome was composed of S, M and L segments. Phylogenetic analysis showed that the S, M and L genes of JXLC1806-2 virus belonged to the Tete serogroup,
, but formed an independent evolutionary branch from the other members of the Tete serogroup. The results showed that the JXLC1806-2 virus, which was named as Lichuan virus, is a new member of Tete serogroup, and this is the first time that a Tete serogroup virus has been isolated in China.
El bagre marino Ariopsis seemanni es aprovechado como pez de consumo en la alimentación de pescadores y pobladores de la región pacifica colombiana y como pez ornamental (5 a 10 cm -longitud total), ...a nivel comercial nacional e internacional. En Colombia esta especie ha sido priorizada en la agenda nacional de investigación en acuicultura de 2011-2012, como una de las especies marinas potenciales en actividades acuícolas. El objetivo de esta investigación fue evaluar el efecto de la gonadotropina coriónica humana (HGC) y el extracto pituitario de carpa (EPC) sobre la maduración final y el desove en hembras adultas de la especie. Se utilizaron 24 parejas de peces silvestres capturadas del medio, con un peso promedio de 263.6±42.2 g y 174.4±30.4 g para hembras y machos, respectivamente. Se utilizaron cuatro tratamientos hormonales: T1: 5 mg EPC/kg; T2: 7 mg EPC/kg; T3: 2000 UI HGC/kg y T4: 1000 UI HGC/kg. Se identificaron tres tipos de oocitos en maduración, no se presentaron diferencias estadísticamente significativas (p>0,05) entre los tratamientos utilizados y la cantidad de oocitos en maduración; no se obtuvo desove espontaneo en ninguna de las hembras inducidas con las dosis hormonales empleadas.
To reduce the number of cheese with potential Staphylococcus aureus contamination reaching consumers, European legislation has stipulated that all cheese must be tested for coagulase-positive ...staphylococci (CPS) at the point in production when numbers are expected to be highest. When CPS counts exceed 105 CFU/mL, staphylococcal enterotoxin (SE) tests must be conducted. When SE tests are positive, the cheese must be destroyed. Manufacturers of Swiss Alpine cheese are exempt from this legislation because SE formation in hard cheese is expected to be very unlikely because of the high scalding temperatures used for cheeses during production, which inactive CPS in the curd. However, this assumption has not been scientifically tested. A laboratory-scale cheese production experiment was performed in which the conditions corresponded to certain limitations in practical cheesemaking conditions such as temperature and time exposure as for production of Gruyere or Tete de Moine Swiss type cheeses. Raw milk aliquots (200 mL) were inoculated with five strains of CPS, and scalding temperatures of 46 to 56°C were used during cheese production. The temperatures applied after the curd was pressed were meant to reproduce the temperature curve in the peripheral zone of a real cheese wheel. Contrary to expectations, SE formation occurred and differed according to the scalding temperature (52 to 56°C). The differences in SE formation were more associated with strain type rather than temperature. These results indicate that the mechanisms of SE formation in cheese require further study.
In the present work, the population diversity and structure of three populations of native Mozambican cattle were studied, to develop knowledge that is required for sound conservation and genetic ...improvement programs of these genetic resources. A total of 228 animals (Landim, Angone, and Tete) were genotyped using the International Dairy and Beef version three (IDBV3) SNP BeadChip array. Population parameters varied within a limited scope, with the average minor allele frequency (MAF) ranging from 0.228 ± 0.154 in the Angone to 0.245 ± 0.145 in the Tete population, while estimates of expected heterozygosities varied from 0.304 ± 0.166 in the Angone to 0.329 ± 0.148 in the Tete population. Low positive (0.065 ± 0.109) inbreeding rates were detected in the three cattle groups. Population structure and admixture analyses indicated low genetic differentiation and various degrees of admixture among the populations. The effective population size has decreased over time and at 12 generations ago ranged between 349 (Tete) and 929 (Landim). The average linkage disequilibrium (LD) of the studied populations ranged from 0.400 ± 0.213 (Tete) to 0.434 ± 0.232 (Landim). The findings of this study will be valuable for formulating management and conservation strategies for indigenous Mozambican cattle populations.
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