The most significant industrial utilization of carbon disulfide (CS2) has been in the manufacture of cellulose rayon, cellophane, and rubber industry. CS2 prompts expanded recurrence of chromosomal ...variations in laborers occupationally exposed to CS2.
In the current study, the DNA analysis was carried out from exfoliated buccal epithelial cells from rubber industry workers exposed to CS2 and an equal number of healthy control subjects. Both the control and experimental subjects were categorized by their smoking habits such as smokers (S) and non-smokers (NS). Furthermore, experimental subjects were further separated based on their exposure period. Students t-test statistical tools were used to analyze the final results.
The present analysis identified a high frequency of DNA damage in rubber industry workers (16.55±0.43) than control subjects (9.8±0.21). Also, maximum number of DNA damage detected in smoking experimental group (18.27±0.02) than non-smoking experimental (15.02±0.01) and smoking control groups (10.25±0.04 ).
Smoking habits synergistically increased the DNA damage in the rubber industry workers exposed to CS2.
Chronicling the dramatic history of the Brazilian Amazon during the Second World War, Seth Garfield provides fresh perspectives on contemporary environmental debates. His multifaceted analysis ...explains how the Amazon became the object of geopolitical rivalries, state planning, media coverage, popular fascination, and social conflict. In need of rubber, a vital war material, the United States spent millions of dollars to revive the Amazon's rubber trade. In the name of development and national security, Brazilian officials implemented public programs to engineer the hinterland's transformation. Migrants from Brazil's drought-stricken Northeast flocked to the Amazon in search of work. In defense of traditional ways of life, longtime Amazon residents sought to temper outside intervention. Garfield's environmental history offers an integrated analysis of the struggles among distinct social groups over resources and power in the Amazon, as well as the repercussions of those wartime conflicts in the decades to come.
Owing to its remarkable electrical, mechanical and thermal properties, graphene has been considered the most promising reinforcing filler for the development of rubber nanocomposites. In this work, a ...novel interfacial structure consisting of reduced graphene oxide (rGO)/N-tert-butyl-2-benzothiazole sulfonamide (NS)/natural rubber (NR) (NR/NS-rGO) with covalent bond connections was fabricated using one-step modification and coprecipitation methods. When the filler loading of NS-rGO is 0.42 vol.%, not only the thermal conductivity of the rubber composite increases to 0.237 Wm
−1
K
−1
, which is 21.5% higher than that of pure NR; meanwhile, the internal heat generation decreases to 2.6 °C, which is 45.8% lower than that of reduced graphene oxide (rGO)/ascorbic acid (VC)/natural rubber (NR) (NR/VC-rGO), and the mechanical properties have been greatly improved. The results demonstrated that the covalent bond connections greatly reduced interfacial thermal resistance at the filler/matrix interface. Furthermore, the enhanced interfacial interaction reduced frictional heat generation at the filler/matrix interface. More importantly, this strategy provided creative insights into the high application potential of graphene in the rubber industry.
Taraxacum kok-saghyz (TKS) is a model plant and a potential rubber-producing crop for the study of natural rubber (NR) biosynthesis. The precise analysis of the NR biosynthesis mechanism is an ...important theoretical basis for improving rubber yield. The small rubber particle protein (SRPP) and rubber elongation factor (REF) are located in the membrane of rubber particles and play crucial roles in rubber biosynthesis. However, the specific functions of the SRPP/REF gene family in the rubber biosynthesis mechanism have not been fully resolved. In this study, we performed a genome-wide identification of the 10 TkSRPP and 2 TkREF genes’ family members of Russian dandelion and a comprehensive investigation on the evolution of the ethylene/methyl jasmonate-induced expression of the SRPP/REF gene family in TKS. Based on phylogenetic analysis, 12 TkSRPP/REFs proteins were divided into five subclades. Our study revealed one functional domain and 10 motifs in these proteins. The SRPP/REF protein sequences all contain typical REF structural domains and belong to the same superfamily. Members of this family are most closely related to the orthologous species T. mongolicum and share the same distribution pattern of SRPP/REF genes in T. mongolicum and L. sativa, both of which belong to the family Asteraceae. Collinearity analysis showed that segmental duplication events played a key role in the expansion of the TkSRPP/REFs gene family. The expression levels of most TkSRPP/REF members were significantly increased in different tissues of T. kok-saghyz after induction with ethylene and methyl jasmonate. These results will provide a theoretical basis for the selection of candidate genes for the molecular breeding of T. kok-saghyz and the precise resolution of the mechanism of natural rubber production.
This paper presents an investigation on operational excellence (OpX) models of sustainable supply chains (SSCs) in Sri Lankan manufacturing organizations during Covid-19 pandemic. This investigation ...consists of multiple case studies of Sri Lankan manufacturing organizations in following industries: rubber and plastic products, wearing apparels, paper and paper products. Based on a pre-existing OpX model, six Critical Success Factors (CSFs) were identified in terms of SSCs. This research was conducted as an exploratory case study where data is collected through in-depth interviews, company websites/reports. By using a deductive approach, findings of CSFs effecting behaviour of OpX models are displayed. Thematic and Content analysis on the behavior of OpX models in SSCs are non-generalizable beyond this research. The findings display the organization in respect to wearing apparels has a more sustainable approach to better manage their OpX model and more strategic Upper Echelons to gain better strategic outcomes before/during Covid-19 pandemic. The profile of a manager was vital in interpreting OpX models in their organizations. The study outcomes can inform organizations to prime their OpX model for a crisis of Covid-19 magnitude. The effects may be generalized further to other industries. The study describes connectivity of Upper Echelons Theory to OpX models and contributes to literature through a demonstration of CSF behaviours in OpX models of SSCs during the Covid-19 crisis.
EPA designated 1,3-butadiene (BD) as a high priority chemical in December 2019 and is presently performing an evaluation under the Toxic Substances Control Act (TSCA). EPA's cancer dose-response ...assessment for BD was published in 2002 and was primarily based on a study on workers exposed to BD in the North American synthetic Styrene-Butadiene Rubber (SBR) Industry developed by the University of Alabama at Birmingham (UAB). EPA relied upon a Poisson regression of leukemia mortality data from this cohort (hereinafter referred to as the SBR study) to estimate the cancer potency of BD. At the time, the SBR cohort included more than 15,000 male workers that were followed up through 1991. The SBR cohort has undergone multiple updates over the past two decades. Most recently, Sathiakumar et al. (2021a, b) published an update, with 18 more years of follow up in addition to approximately 5,000 female workers and updated exposure concentration estimates. Recent EPA assessments (e.g., for ethylene oxide, USEPA 2016) based on epidemiological studies use Cox proportional hazards models because they offer better control of the effect of age in cancer development and are less restrictive than Poisson regression models. Here, we develop exposure-response models using standard Cox proportional hazards regression. We explore the relationship between six endpoints (all leukemia, lymphoid leukemia, myeloid leukemia, multiple myeloma, non-Hodgkin's lymphoma, and bladder cancer) and exposures to BD using the most recent exposure metrics and the most recent update of the SBR study. After adjusting for statistically significant covariates, an upper 95% confidence level on the cancer potency based on leukemia derived herein is 0.000086 per ppm, which is approximately 1,000-fold less than EPA's (2002) estimate of 0.08 per ppm and about 10-fold less than TCEQ's (2008) estimate of 0.0011 per ppm.
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•An updated cancer unit risk (UR) value for 1,3-butadiene was derived.•The latest SBR worker cohort data (including women) was used.•Cox proportional hazards regression was used, including consideration of covariates.•Leukemia (including subtypes) and bladder cancer endpoints were assessed.•An upper bound UR value of 0.000086 per ppm was calculated.
Addressing the profound impact of Tapping Panel Dryness (TPD) on yield and quality in the global rubber industry, this study introduces a cutting-edge Otsu threshold segmentation technique, enhanced ...by Dung Beetle Optimization (DBO-Otsu). This innovative approach optimizes the segmentation threshold combination by accelerating convergence and diversifying search methodologies. Following initial segmentation, TPD severity levels are meticulously assessed using morphological characteristics, enabling precise determination of optimal thresholds for final segmentation. The efficacy of DBO-Otsu is rigorously evaluated against mainstream benchmarks like Peak Signal-to-Noise Ratio (PSNR), Structural Similarity Index (SSIM), and Feature Similarity Index (FSIM), and compared with six contemporary swarm intelligence algorithms. The findings reveal that DBO-Otsu substantially surpasses its counterparts in image segmentation quality and processing speed. Further empirical analysis on a dataset comprising TPD cases from level 1 to 5 underscores the algorithm's practical utility, achieving an impressive 80% accuracy in severity level identification and underscoring its potential for TPD image segmentation and recognition tasks.
Celotno besedilo
Dostopno za:
DOBA, IZUM, KILJ, NUK, PILJ, PNG, SAZU, SIK, UILJ, UKNU, UL, UM, UPUK
The change characteristics of production capacity, output, import and export quantity, apparent consumption of main synthetic rubber pro-ducts of China in 2023 were retrospected, the status of supply ...and demand of butadiene as well as price changes of main rubber varieties were introduced, and the developing trend of China′ synthetic rubber industry in 2024 was prospected.
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