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1.
J Invertebr Pathol ; 204: 108114, 2024 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-38636720

RESUMO

Agricultural Productivity and plant health are threatened by the root-knot nematode. The use of biocontrol agents reduces the need for chemical nematicides and improves the general health of agricultural ecosystems by offering a more environmentally friendly and sustainable method of managing nematode infestations. Plant-parasitic nematodes can be efficiently managed with the use of entomopathogenic nematodes (EPNs), which are widely used biocontrol agents. This study focused on the nematicidal activity of the secondary metabolites present in the bacteria Ochrobactrum sp. identified in the EPN, Heterorhabditisindica against Root-Knot Nematode (Meloidogyne incognita). Its effect on egg hatching and survival of juveniles of root- knot nematode (RKN) was examined. The ethyl acetate component of the cell-free culture (CFC) filtrate of the Ochrobactrum sp. bacteria was tested at four different concentrations (25 %, 50 %, 75 % and 100 %) along with broth and distilled water as control. The bioactive compounds of Ochrobactrum sp. bacteria showed the highest suppression of M. incognita egg hatching (100 %) and juvenile mortality (100 %) at 100 % concentration within 24 h of incubation. In this study, unique metabolite compounds were identified through the Gas Chromatography- Mass Spectrometry (GC-MS) analysis, which were found to have anti- nematicidal activity. In light of this, molecular docking studies were conducted to determine the impact of biomolecules from Ochrobactrum sp. using significant proteins of M. incognita, such as calreticulin, sterol carrier protein 2, flavin-containing monooxygenase, pectate lyase, candidate secreted effector, oesophageal gland cell secretory protein and venom allergen-like protein. The results also showed that the biomolecules from Ochrobactrum sp. had a significant inhibitory effect on the different protein targets of M. incognita. 3-Epimacronine and Heraclenin were found to inhibit most of the chosen target protein. Among the targets, the docking analysis revealed that Heraclenin exhibited the highest binding affinity of -8.6 Kcal/mol with the target flavin- containing monooxygenase. Further, the in vitro evaluation of 3- Epimacronine confirmed their nematicidal activity against M. incognita at different concentrations. In light of this, the present study has raised awareness of the unique biomolecules of the bacterial symbiont Ochrobactrum sp. isolated from H. indica that have nematicidal properties.


Assuntos
Simulação de Acoplamento Molecular , Ochrobactrum , Tylenchoidea , Animais , Ochrobactrum/metabolismo , Antinematódeos/farmacologia , Antinematódeos/metabolismo , Antinematódeos/química , Controle Biológico de Vetores
2.
Bioresour Technol ; 399: 130630, 2024 May.
Artigo em Inglês | MEDLINE | ID: mdl-38522678

RESUMO

The present study aims to enhance the biomethane production potential of microalgae via a dual disintegration process. During this process, the microalgae biomass was firstly subjected to cell wall weakening by thermochemical disintegration (TC) (50 to 80 °C), pH adjustment with alkali, NaOH (6 to 10) and time (0 to 10 min) and, secondly, by bacterial disintegration (BD). TC-BD disintegration was comparatively higher (33 %) than BD (24 %), TC (8.5 %), and control (7 %). A more significant VFA accumulation of 2816 mg/L was recorded for TC-BD. Similarly, a greater substrate anaerobic biodegradability was achieved in TC-BD (0.32 g COD /g COD) than BD (0.21 g COD /g COD), TC alone (0.09 gCOD/g COD) and control (0.08 g COD /g COD), respectively. The TC-BD achieves a positive net profit and an energy ratio of + 0.12 GJ/d and 1.03. The proposed dual disintegration has a promising future for commercialization.


Assuntos
Microalgas , Biomassa , Análise Custo-Benefício , Metano , Bactérias , Anaerobiose
3.
Morphologie ; 108(361): 100761, 2024 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-38354627

RESUMO

BACKGROUND: Spinal Accessory Nerve (SAN), which innervates the sternocleidomastoid (SCM) and trapezius muscles, is closely related to the internal jugular vein (IJV) in the anterior triangle of the neck and passes superficially in the posterior triangle. Injury to SAN is a major complication of level II neck dissection, leading to shoulder syndrome. The present study aims to assess the course and its relation to the SCM muscle and IJV in the Tamil ethnolinguistic groups in South India. METHODS AND MATERIALS: The anterior and posterior triangles of the neck were dissected in 28 formalin-fixed adult cadavers. The course of the SAN and the entry and exit points of SAN along the SCM muscle were assessed using the mastoid process as the reference. Recorded data was analyzed using SPSS software. RESULTS: The SAN was anteriorly related to the IJV in 58.73%, posteriorly in 37.5%, and pierced through the IJV in 3.57% of the specimens. The entry and exit points of SAN from the mastoid process were 37.86±7.26mm and 48.55±8.22mm, respectively. In 86.67% of the cases, the SAN traversed through the SCM muscle, and in 13.33%, it was deep to the SCM. CONCLUSION: The present study reports that the SAN is variable in its course, and relation to SCM and IJV. Knowledge about the variant anatomy of the SAN in the triangles of the neck is important and it aids surgeons to prevent iatrogenic injuries to SAN or IJV and enhance surgical safety in neck procedures.


Assuntos
Nervo Acessório , Variação Anatômica , Cadáver , Veias Jugulares , Músculos do Pescoço , Pescoço , Humanos , Nervo Acessório/anatomia & histologia , Feminino , Masculino , Músculos do Pescoço/inervação , Músculos do Pescoço/anatomia & histologia , Pescoço/inervação , Pescoço/anatomia & histologia , Índia , Veias Jugulares/anatomia & histologia , Esvaziamento Cervical/efeitos adversos , Adulto , Pessoa de Meia-Idade , Idoso , Músculos Superficiais do Dorso/inervação , Músculos Superficiais do Dorso/anatomia & histologia
4.
Mymensingh Med J ; 33(1): 101-106, 2024 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-38163780

RESUMO

Sexually transmitted infection is a frequent cause of tubal factor abnormality. Chlamydia trachomatis is a common causative organism for sexually transmitted infection. There are studies indicating association of chlamydial antibodies in serum with tubal abnormalities. In many centers chlamydial antibody test is done as part of routine work up for infertility. The objective of the study was to evaluate the sensitivity and specificity of chlamydial antibody test in screening infertile women for tubal factor infertility. This cross-sectional observational study was performed for one year from January 2019 to December 2019 in the Department of Reproductive Endocrinology and Infertility of Bangabandhu Sheikh Mujib Medical University (BSMMU), Bangladesh. The infertile women having laparoscopy as part of infertility work up were enrolled in the study. The women had their serum tested for chlamydial antibody IgG by enzyme linked immune-sorbent assay. The sero-positivity for chlamydial antibody was tested against the findings of laparoscopy and dye test as gold standard for diagnosing tubal factor infertility. Statistical analysis was done to find out the sensitivity and specificity of the chlamydial antibody test in screening infertile women for tubal factor infertility. The study population included 163 infertile women with mean age 29.8±5.8 years. The tubal factor infertility was present in 56.4% of the women. The sero-positivity of Chlamydia trachomatis IgG was 36.6%. Sensitivity and specificity of Chlamydial antibody test (IgG positive) in detecting tubal factor infertility is 47.8% and 70.4% respectively. Positive predictive value of chlamydial antibody test in detecting tubal factor infertility is 41.5% and negative predictive value is 72.4%. Positive likelihood ratio is 1.59. Negative likelihood ratio is 0.74. Accuracy is 57.67%. In conclusion, the chlamydial antibody test may not be an appropriate screening test for tubal factor infertility in women of Bangladesh because of low sensitivity and moderately high specificity.


Assuntos
Infecções por Chlamydia , Infertilidade Feminina , Infecções Sexualmente Transmissíveis , Feminino , Humanos , Adulto Jovem , Adulto , Infertilidade Feminina/diagnóstico , Infertilidade Feminina/etiologia , Estudos Transversais , Infecções por Chlamydia/complicações , Infecções por Chlamydia/diagnóstico , Sensibilidade e Especificidade , Chlamydia trachomatis , Anticorpos Antibacterianos/análise , Imunoglobulina G
5.
J Environ Manage ; 351: 119777, 2024 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-38086119

RESUMO

Dual chambered microbial fuel cell (DMFC) is an advanced and effective treatment technology in wastewater treatment. The current work has made an effort to treat petrochemical industrial wastewater (PWW) as a DMFC substrate for power generation and organic substance removal. Investigating the impact of organic load (OL) on organic reduction and electricity generation is the main objective of this study. At the OL of 1.5 g COD/L, the highest total chemical oxygen demand (TCOD) removal efficiency of 88%, soluble oxygen demand (SCOD) removal efficiency of 80% and total suspended solids (TSS) removal efficiency of 71% were seen, respectively. In the same optimum condition of 1.5 g COD/L, the highest current and power density of about 270 mW/m2 and 376 mA/m2 were also observed. According to the results of this study, using high-strength organic wastewater in DMFC can assist in addressing the issue of the petrochemical industries and minimize the energy demand.


Assuntos
Fontes de Energia Bioelétrica , Purificação da Água , Águas Residuárias , Eletricidade , Purificação da Água/métodos , Análise da Demanda Biológica de Oxigênio , Eletrodos , Eliminação de Resíduos Líquidos/métodos
6.
J Environ Manage ; 345: 118907, 2023 Nov 01.
Artigo em Inglês | MEDLINE | ID: mdl-37666133

RESUMO

The semi-continuous anaerobic co-digestion (AcoD) of thermal and thermal-alkali pretreated organic fraction of municipal solid waste (OFMSW) and sewage sludge (SS) was studied under varying hydraulic retention times (HRT) and organic loading rates (OLR Three semi-continuous digesters were operated under control (non-pre-treated), thermally pretreated (125 °C), and thermal-alkali pretreated (125°C-3g/L NaOH) conditions at variable OLRs at 2.5, 4.0, 5.1, and 7.6 kgVS/m3.d and corresponding HRTs of 30, 20, 15, and 10 days. The 10 and 43% higher methane yield (0.445 m3/kgVS) and 11 and 57% higher VS removal (52%) was achieved for thermal-alkali pretreated digester at 5.1 kgVS/m3.d OLR over thermally pretreated (0.408 m3/kgVS, 45% VS removal) and control digesters (0.310 m3/kgVS, 33% VS removal), respectively. Thermal and thermal-alkali digesters failed on increasing the OLR to 7.6 kgVS/m3.d, whereas the control digester becomes upset at 5.1 kgVS/m3.d OLR. The metagenomic study revealed that Firmicutes, Bacteroidetes, Chloroflexi, Euryarchaeota, Proteobacteria, and Actinobacteria were the predominant bacterial population, whereas Methanosarcina and Methanothrix dominated the archaeal community. Energy balance analysis revealed that thermal alkali pretreatment showed the highest positive energy balance of 114.6 MJ/ton with an energy ratio of 1.25 compared with thermally pretreated (81.5 MJ/ton) and control samples (-46.9 MJ/ton). This work pave the way for scaleup of both thermal and thermal-alkali pre-treatment at 125 °C to realize the techno-economic and energy potential of the process.


Assuntos
Microbiota , Resíduos Sólidos , Anaerobiose , Álcalis , Metano , Digestão
7.
Bioresour Technol ; 387: 129587, 2023 Nov.
Artigo em Inglês | MEDLINE | ID: mdl-37549718

RESUMO

Wastewater disposal in the ecosystem affects aquatic and human life, which necessitates the removal of the contaminants. Eliminating wastewater contaminants using biochar produced through the thermal decomposition of lignocellulosic biomass (LCB) is sustainable. Due to its high specific surface area, porous structure, oxygen functional groups, and low cost, biochar has emerged as an alternate contender in catalysis. Various innovative advanced technologies were combined with biochar for effective wastewater treatment. This review examines the use of LCB for the synthesis of biochar along with its activation methods. It also elaborates on using advanced biochar-based technologies in wastewater treatment and the mechanism for forming oxidizing species. The research also highlights the use of machine learning in pollutant removal and identifies the obstacles of biochar-based catalysts in both real-time and cutting-edge technologies. Probable and restrictions for further exploration are discussed.


Assuntos
Águas Residuárias , Poluentes Químicos da Água , Humanos , Ecossistema , Adsorção , Carvão Vegetal/química , Catálise , Poluentes Químicos da Água/química
8.
Environ Res ; 235: 116635, 2023 10 15.
Artigo em Inglês | MEDLINE | ID: mdl-37454801

RESUMO

The present study aimed to improve the hydrolysis potential of paper mill sludge through a two-phase disintegration process. In Particular, attention was focused on removal of extracellular polymeric substance (EPS) i.e. deflocculation of sludge in order to improve the efficiency of subsequent disperser disintegration. During deflocculation, carbohydrate, protein and deoxyribonucleic acids (DNA) were used as assessment parameters. During disintegration, soluble chemical oxygen demand (SCOD) and suspended solids (SS) reduction were used as assessment index to evaluate the efficiency of disintegration. A greater EPS removal was attained while deflocculating the sludge at calcium peroxide dosage of 0.05 g/g suspended solids (SS) and at a temperature of 70 °C. When comparing the disintegrated samples, a clear variation was noted in deflocculated and disintegrated sludge (19.2%) than the disintegrated sludge alone (13.5%). This clearly shows the need for deflocculation prior to disintegration. Likewise, a higher biomethane production of 0.214 L/g COD was achieved in deflocculated and disintegrated sludge than the pretreated sludge alone. Deflocculation reduces sludge management cost from 170 USD (Disperser alone (D alone disintegration)) to 51 USD (Thermal calcium peroxide mediated-Disperser (TCaO2-D disintegration), indicating the efficiency of the proposed disintegration.


Assuntos
Matriz Extracelular de Substâncias Poliméricas , Esgotos , Anaerobiose , Floculação , Análise da Demanda Biológica de Oxigênio , Eliminação de Resíduos Líquidos
9.
Bioresour Technol ; 387: 129560, 2023 Nov.
Artigo em Inglês | MEDLINE | ID: mdl-37517710

RESUMO

The greener chemical and enzymatic pretreatments for lignocellulosic biomasses are portraying a crucial role owing to their recalcitrant nature. Traditional pretreatments lead to partial degradation of lignin and hemicellulose moieties from the pretreated biomass. But it still restricts the enzyme accessibility for the digestibility towards the celluloses and the interaction of lignin-enzymes, nonproductively. Moreover, incursion of certain special chemical treatments and other lignin sulfonation techniques to the enzymatic pretreatment (hybrid enzymatic pretreatment) enhances the lignin structural modification, solubilization of the hemicelluloses and both saccharification and fermentation processes (SAF). This article concentrates on recent developments in various chemical and hybrid enzymatic pretreatments on biomass materials with their mode of activities. Furthermore, the issues on strategies of the existing pretreatments towards their industrial applications are highlighted, which could lead to innovative ideas to overcome the challenges and give guideline for the researchers towards the lignocellulosic biorefineries.


Assuntos
Celulose , Lignina , Lignina/química , Celulose/metabolismo , Fermentação , Biomassa , Hidrólise
10.
Mymensingh Med J ; 32(3): 699-703, 2023 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-37391962

RESUMO

Weight management is central to the treatment of infertile women with polycystic ovary syndrome. Both body mass index and waist circumference are measures of obesity. The objective of the study was to examine the clinical importance of waist circumference and body mass index in predicting insulin resistance. The cross-sectional study involved a total of 126 consecutive infertile women with polycystic ovary syndrome attending the Infertility unit of the Department of Obstetrics and Gynaecology of Bangabandhu Sheikh Mujib Medical University (BSMMU), Dhaka, Bangladesh from January 2017 to December 2017. The anthropometric measurements like weight, height and waist circumference were made and body mass index and waist hip ratio were calculated. Fasting insulin and fasting plasma glucose were estimated in early follicular phase of menstrual cycle. Insulin resistance was calculated with HOMA-IR. Body mass index and waist circumference were examined for clinical prediction of insulin resistance by ROC curve analysis. The mean age was 25.56±3.90 years. Mean body mass index was 26.79±3.25, mean waist circumference was 90.9±9.4cm. By body mass index thresholds, 47.9% of the women were overweight, 39.7% of the women were obese. By waist circumference threshold, 80.2% of the women were centrally obese. Body mass index and waist circumference, both had significant correlation with hyperinsuliaemia. When body mass index and waist circumference were examined for predicting insulin resistance by sensitivity, specificity, positive likelihood ratio and negative likelihood ratio, waist circumference appeared to have moderate clinical importance compared to the negligible role of body mass index. Waist circumference may be a better predictor of insulin resistance than body mass index in infertile women with polycystic ovary syndrome.


Assuntos
Infertilidade Feminina , Resistência à Insulina , Síndrome do Ovário Policístico , Gravidez , Feminino , Humanos , Adulto Jovem , Adulto , Infertilidade Feminina/etiologia , Circunferência da Cintura , Índice de Massa Corporal , Síndrome do Ovário Policístico/complicações , Estudos Transversais , Bangladesh , Obesidade
11.
J Environ Manage ; 343: 118240, 2023 Oct 01.
Artigo em Inglês | MEDLINE | ID: mdl-37235990

RESUMO

A significant amount of plastic waste is generated each year on a global scale, in which the maximum quantity of plastic waste is typically dumped in landfills in various parts of the world. Moreover, dumping plastic waste in landfills cannot address the issue of proper disposal; it simply delays the process. Exploiting waste resources entails environmental hazards because plastic wastes buried in landfills gradually break down into Microplastics (MPs) due to physical, chemical, and biological effects. The possibility of landfill leachate as a source of MPs in the environment has not received much attention. Without systematic treatment, MPs in leachate increase the risk to human health and environmental health since they contain dangerous and toxic pollutants and antibiotic resistance genes transmitted by leachate vectors. Due to their severe environmental risks, MPs are now widely recognized as emerging pollutants. Therefore, the composition of MPs in landfill leachate and the interaction of MPs with other hazardous contaminants are summarised in this review. The available potential mitigation or treatment methods of MPs in landfill leachate as of now, along with the drawbacks and challenges of the present leachate treatment for eliminating MPs, are described in this review. Since it is unclear how MPs will be removed from the current leachate facilities, it is crucial to develop innovative treatment facilities as quickly as possible. Finally, the areas that require more research to provide complete solutions to the persistent problem of plastic debris are discussed.


Assuntos
Eliminação de Resíduos , Poluentes Químicos da Água , Humanos , Eliminação de Resíduos/métodos , Microplásticos , Plásticos , Poluentes Químicos da Água/análise , Instalações de Eliminação de Resíduos , Resíduos Sólidos/análise
12.
Polymers (Basel) ; 15(7)2023 Apr 06.
Artigo em Inglês | MEDLINE | ID: mdl-37050415

RESUMO

Microbial exopolysaccharides (EPSs), e.g., xanthan, dextran, gellan, curdlan, etc., have significant applications in several industries (pharma, food, textiles, petroleum, etc.) due to their biocompatibility, nontoxicity, and functional characteristics. However, biodegradability, poor cell adhesion, mineralization, and lower enzyme activity are some other factors that might hinder commercial applications in healthcare practices. Some EPSs lack biological activities that make them prone to degradation in ex vivo, as well as in vivo environments. The blending of EPSs with other natural and synthetic polymers can improve the structural, functional, and physiological characteristics, and make the composites suitable for a diverse range of applications. In comparison to EPS, composites have more mechanical strength, porosity, and stress-bearing capacity, along with a higher cell adhesion rate, and mineralization that is required for tissue engineering. Composites have a better possibility for biomedical and healthcare applications and are used for 2D and 3D scaffold fabrication, drug carrying and delivery, wound healing, tissue regeneration, and engineering. However, the commercialization of these products still needs in-depth research, considering commercial aspects such as stability within ex vivo and in vivo environments, the presence of biological fluids and enzymes, degradation profile, and interaction within living systems. The opportunities and potential applications are diverse, but more elaborative research is needed to address the challenges. In the current article, efforts have been made to summarize the recent advancements in applications of exopolysaccharide composites with natural and synthetic components, with special consideration of pharma and healthcare applications.

13.
Environ Pollut ; 328: 121525, 2023 Jul 01.
Artigo em Inglês | MEDLINE | ID: mdl-37062401

RESUMO

The voluminous nature of palm oil mill effluent (POME) is directly associated with environmental hazards and could be turned into biorefinery products. The POME, rich in BOD, COD, and oil and grease, with few hazardous materials such as siloxanes, fatty acid methyl ester, and phenolic compounds that may significantly increase the risk of violating the effluent quality standards. Recently, the application of chemical and biological risk assessment that can use electrochemical sensors and microalgae-like species has gained paramount attention towards its remediation. This review describes the existing risk assessment for POME and recommends a novel assessment approach using fish species including invasive ones as suitable for identifying the toxicants. Various physico-chemical and biological treatments such as adsorption, coagulation-flocculation, photo-oxidation, solar-assisted extraction, anaerobic digestion, integrated anaerobic-aerobic, and microalgae cultivation has been investigated. This paper offers an overview of anaerobic technologies, with particular emphasis on advanced bioreactors and their prospects for industrial-level applications. To illustrate, palmitic acid and oleic acid, the precursors of fatty acid methyl ester found in POME pave the way to produce biodiesel with 91.45%. Although there are some challenges in attaining production at an economic scale, this review offers some opportunities that could help in overcoming these challenges.


Assuntos
Substâncias Perigosas , Óleos de Plantas , Animais , Óleo de Palmeira , Óleos de Plantas/química , Eliminação de Resíduos Líquidos , Resíduos Industriais/análise , Ésteres
14.
Bioresour Technol ; 376: 128857, 2023 May.
Artigo em Inglês | MEDLINE | ID: mdl-36906239

RESUMO

This study aimed to pretreat the waste activated sludge (WAS) by ultrasonication in an energy efficient way by combining sodium citrate with ultrasonic pretreatment at 0.03 g/g suspended solids (SS) of dosage. The ultrasonic pretreatment was done at various (20-200 W) power levels, sludge concentration (7 to 30 g/L), sodium citrate dosages (0.01 to 0.2 g/g SS). An elevated COD solubilization of 26.07 ± 0.6 % was achieved by combined pretreatment at a treatment time of 10 min, ultrasonic power level of 160 W when compared to individual ultrasonic pretreatment (18.6 ± 0.5 %). A higher biomethane yield of 0.26 ± 0.009 L/g COD was achieved in sodium citrate combined ultrasonic pretreatment (SCUP) than ultrasonic pretreatment (UP) 0.145 ± 0.006 L/g COD. Almost 50% of the energy can be saved through SCUP when compared to UP. Future study evaluating SCUP in continuous mode anaerobic digestion is vital.


Assuntos
Biocombustíveis , Esgotos , Citrato de Sódio , Biocombustíveis/análise , Análise Custo-Benefício , Ultrassom , Anaerobiose , Eliminação de Resíduos Líquidos , Metano
15.
Bioresour Technol ; 368: 128332, 2023 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-36414137

RESUMO

Hydrogen has gained attention as an alternative source of energy because of its non-polluting nature as on combustion it produces only water. Biological methods are eco-friendly and have benefits in waste management and hydrogen production simultaneously. The use of algal biomass as feedstock in dark fermentation is advantageous because of its low lignin content, high growth rate, and carbon-fixation ability. The major bottlenecks in biohydrogen production are its low productivity and high production costs. To overcome these issues, many advances in the area of biomass pretreatment to increase sugar release, understanding of algal biomass composition, and development of fermentation strategies for the complete recovery of nutrients are ongoing. Recently, mixed substrate fermentation, multistep fermentation, and the use of nanocatalysts to improve hydrogen production have increased. This review article evaluates the current progress in algal biomass pretreatment, key factors, and possible solutions for increasing hydrogen production.


Assuntos
Hidrogênio , Lignina , Biomassa , Fermentação , Nutrientes
16.
Bioresour Technol ; 369: 128376, 2023 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-36414138

RESUMO

In this study, an innovative approach was developed to enhance the hydrolysis through phase-separated pretreatment by removing exopolymeric substances via mild sonication followed by thermo-Fenton disintegration. The exopolymeric substances fragmentation was enhanced at the sonic specific energy input of 2.58 kJ/kg total solids. After exopolymeric substance removal, the disintegration of biomass by thermo-Fenton yield the solubilization of 29.8 % at Fe2+:H2O2 dosage and temperature of 0.009:0.036 g/g suspended solids and 80 °C as compared to thermo-Fenton alone disintegration. The polyhydroxybutyrate content of 93.1 % was accumulated by Bacillus aryabhattai at the optimum time of 42 h, while providing 70 % (v/v) pre-treated supernatant as a carbon source under nutrient-limiting condition. Moreover, the biogas generation of 0.187 L/g chemical oxygen demand was achieved using settled pretreated sludge. The pretreated sludge sample thus served as a carbon source for polyhydroxybutyrate producers as well as substrate for biogas production.


Assuntos
Biocombustíveis , Esgotos , Esgotos/química , Biocombustíveis/análise , Anaerobiose , Sonicação , Peróxido de Hidrogênio/química , Análise da Demanda Biológica de Oxigênio , Eliminação de Resíduos Líquidos , Metano/química
17.
Bioresour Technol ; 369: 128383, 2023 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-36427767

RESUMO

The main downside of utilizing algal biomass for biofuel production is the rigid cell wall which confines the availability of soluble organics to hydrolytic microbes during biofuel conversion. This constraint reduces the biofuel production efficiency of algal biomass. On the other hand, presenting various pretreatment methods before biofuel production affords cell wall disintegration and enhancement in biofuel generation. The potential of pretreatment methods chiefly relies on the extent of biomass liquefaction, energy, and cost demand. In this review, different pretreatments employed to disintegrate algal biomass were conferred in depth with detailed information on their efficiency in enhancing liquefaction and biofuel yield for pilot-scale implementation. Based on this review, it has been concluded that combinative and phase-separated pretreatments provide virtual input in enhancing the biofuel generation based on liquefaction potential, energy, and cost. Future studies should focus on decrement in cost and energy requirement of pretreatment in depth.


Assuntos
Biocombustíveis , Plantas , Biomassa , Análise Custo-Benefício , Hidrólise
18.
Bioresour Technol ; 367: 128215, 2023 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-36332858

RESUMO

Carotenoids are naturally occurring pigments that are widely distributed in algae, fungi, bacteria, and plants. Carotenoids play a significant role in the food, feed, cosmetic, nutraceutical, and pharmaceutical industries. These pigments are effectively considered as a health-promoting compounds, which are widely used in our daily diet to reduce the risk of chronic diseases such as cardiovascular diseases, cancer, acute lung injury, cataracts, neural disorders, etc. In this context, this review paper demonstrates the synthesis of carotenoids and their potential application in the food and pharmaceutical industries. However, the demand for carotenoid production is increasing overtime, and the extraction and production are expensive and technically challenging. The recent developments in carotenoid biosynthesis, and key challenges, bottlenecks, and future perspectives were also discussed to enhance the circular bioeconomy.


Assuntos
Carotenoides , Fungos , Bactérias , Plantas , Suplementos Nutricionais
19.
Bioresour Technol ; 366: 128203, 2022 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-36330969

RESUMO

Polyhydroxyalkanoates (PHA) are the more attractive sustainable green plastic, and it has the potential to replace petroleum-based plastics (PBP) in the global market. Recently, most of the developed and developing countries have banned the use of traditional PBP. This increases the demand for green plastic production and positively impacts the global market. Producing green plastic from various waste streams such as whey, animal, and crude glycerol will be eco-friendly and cost-effective. However, the factors influencing the environmental sustainability of PHA production from different waste streams are still unclear. This review could be reinforced concrete to researchers to gather deep knowledge on techno-economic analysis, life-cycle assessment, environmental and ecological risks caused during PHA production from different waste streams.


Assuntos
Petróleo , Poli-Hidroxialcanoatos , Animais , Plásticos , Soro do Leite
20.
Comput Intell Neurosci ; 2022: 1703696, 2022.
Artigo em Inglês | MEDLINE | ID: mdl-36238670

RESUMO

The introduction of artificial intelligence (AI) and machine learning (ML) technologies in recent years has resulted in improved company performance. Customer churn forecast is a difficult problem in many corporate sectors, particularly the telecommunications industry. Because customer churns have a direct impact on a company's total revenue, telecommunications firms have begun to develop 76 models to reduce churns at an earlier stage. Previous research has revealed that AI and ML models are effective CCP solutions. According to this viewpoint, this study proposes a unique AI-based CCP model for Telecommunication Business Markets (AICCP-TBM). The AICCP-TBM model's purpose is to control the existence of churners and non-churners in the telecom sector. The proposed AICCP-TBM model employs a Chaotic Salp Swarm Optimization-based Feature Selection (CSSO-FS) method for the best feature assortment. In addition, a Fuzzy Rule-based Classifier(FRC) is used to distinguish between client churners and non-churners. A technique known as Quantum Behaved Particle Swarm Optimization (QPSO) is used to pick the membership functions for the FRC model in order to improve the classification performance of the FRC model. The performance of the AICCP-TBM model is validated using a benchmark CCP dataset and the experimental results are reviewed from several angles. In relations of presentation, the imitation consequences demonstrated that the AICCP-TBM model surpassed the most recent state-of-the-art CPP models. The suggested AICCP-TBM method's comparative accuracy was thoroughly tested on the three datasets used. Using datasets 1-3, this technique obtained better levels of accuracy, with the maximum attainable values being 97.25 %, 97.5 % and 94.33 %. The simulation results for the AICCP-TBM model demonstrated improved prediction performance.


Assuntos
Algoritmos , Inteligência Artificial , Comércio , Simulação por Computador , Humanos , Aprendizado de Máquina
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