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N-GLYCAN MATURATION IS CRUCIAL FOR CYTOKININ-MEDIATED DEVELOPMENT AND CELLULOSE SYNTHESIS IN ORYZA SATIVA
(Pub Med, 2013-02-25) Wahyu Indra, Duwi Fanata; Kyoung, Hwan Lee; Bo Hwa, Son; Jae, Yong Yoo; Rikno Harmoko, Harmoko; Ki, Seong Ko; Nirmal Kumar, Ramasamy; Kyung, Hwa Kim; Doo-Byoung, Oh; Hyun, Suk Jung; Jae-Yean, Kim; Sang, Yeol Lee; Kyun, Oh Lee
To explore the physiological significance of N-glycan maturation in the plant Golgi apparatus, gnt1, a mutant with loss of N-acetylglucosaminyltransferase I (GnTI) function, was isolated in Oryza sativa. gnt1 exhibited complete inhibition of N-glycan maturation and accumulated high-mannose N-glycans. Phenotypic analyses revealed that gnt1 shows defective post-seedling development and incomplete cell wall biosynthesis, leading to symptoms such as failure in tiller formation, brittle leaves, reduced cell wall thickness, and decreased cellulose content. The developmental defects of gnt1 ultimately resulted in early lethality without transition to the reproductive stage. However, callus induced from gnt1 seeds could be maintained for periods, although it exhibited a low proliferation rate, small size, and hypersensitivity to salt stress. Shoot regeneration and dark-induced leaf senescence assays indicated that the loss of GnTI function results in reduced sensitivity to cytokinin in rice. Reduced expression of A-type O. sativa response regulators that are rapidly induced by cytokinins in gnt1 confirmed that cytokinin signaling is impaired in the mutant. These results strongly support the proposed involvement of N-glycan maturation in transport as well as in the function of membrane proteins that are synthesized via the endomembrane system.
PREPARATION AND CHARACTERIZATION OF MUCILAGE POLYSACCHARIDE FOR BIOMEDICAL APPLICATIONS
(Elsevier, 2013-10-15) Archana G; Sabina K; Babuskin S; Radhakrishnan K; Mohammed A, Fayidh; Azhagu Saravana Babu P; Sivarajan M; Sukumar M
In the present investigation, the polysaccharide/mucilage from waste of Abelmoscus esculentus by modification in hot extraction using two different solvents (Acetone, Methanol) were extracted, characterized and further compared with seaweed polysaccharide for their potential applications. The percentage yield, emulsifying capacity and swelling index of this mucilage were determined. The macro algae and okra waste, gave high % yield (22.2% and 8.6% respectively) and good emulsifying capacity (EC% = 52.38% and 54.76% respectively) with acetone, compared to methanol (11.3% and 0.28%; EC% = 50%) (PH = 7) while swelling index was greater with methanol than acetone extracts respectively. The infrared (I.R.) spectrum of the samples was recorded to investigate the chemical structure of mucilage. Thermal analysis of the mucilage was done with TGA (Thermal Gravimetric Analyzer) and DSC (Differential Scanning Calorimeter) which showed both okra and algal polysaccharide were thermostable hydrogels.
CARROT ANTIFREEZE PROTEIN ENHANCES CHILLING TOLERANCE IN TRANSGENIC TOMATO
(Springer Link, 2014) Sarma, Rajeev Kumar; Rajamani, Kiruba; Srinivasan, Balamurugan; Hélia G, Cardoso; Arnholdt-Schmitt, Birgit; Ahmed, Zakwan; Ramalingam, Sathishkumar
In an attempt to improve chilling tolerance, the carrot gene encoding the antifreeze protein (AFP) was cloned under the control of constitutive CaMV35S promoter and genetically transformed the tomato var. PKM1 using Agrobacterium-mediated genetic transformation. Putative transgenic plants were confirmed by PCR using AFP-specific primers and grown to maturity. The integration of AFP transgene in the tomato genome was confirmed by Southern blot analysis. The AFP gene expression in transgenic plants was determined using semi-quantitative reverse transcription PCR. Upon exposure to chilling stress (4 °C), a significant decrease in membrane injury index was observed in AFP transgenic tomato lines without any phenotypic aberrations when compared with WT plants. Hence, this study clearly proves that the development of chilling tolerant tomato plants will soon become a reality.
CARROT ANTIFREEZE PROTEIN ENHANCES CHILLING TOLERANCE IN TRANSGENIC TOMATO
(Springer Berlin Heidelberg, 2014) Sarma, Rajeev Kumar; Rajamani, Kiruba; Srinivasan, Balamurugan; Helia G, Cardoso; Arnholdt, Schmitt Birgit; Ahmed, Zakwan; Ramalingam, Sathishkumar
In an attempt to improve chilling tolerance, the carrot gene encoding the antifreeze protein (AFP) was cloned under the control of constitutive CaMV35S promoter and genetically transformed the tomato var. PKM1 using Agrobacterium-mediated genetic transformation. Putative transgenic plants were confirmed by PCR using AFP-specific primers and grown to maturity. The integration of AFP transgene in the tomato genome was confirmed by Southern blot analysis. The AFP gene expression in transgenic plants was determined using semi-quantitative reverse transcription PCR. Upon exposure to chilling stress (4 C), a significant decrease in membrane injury index was observed in AFP transgenic tomato lines without any phenotypic aberrations when compared with WT plants. Hence, this study clearly proves that the development of chilling tolerant tomato plants will soon become a reality.
EFFECT OF VITAMIN C ON mRNA EXPRESSION OF BMPs DURING FRACTURE HEALING IN THE FEMUR CALLUS OF SPRAGUE-DAWLEY FEMALE RATS
(Innovare Academic Sciences, 2014) G., Anbarasi; K., Senthil Kumar; P, Narmadha; N, Srinivasan
Fracture reparation is a complex physiological process. During fracture healing no scar is left but a new bone tissue is created. In addition to mechanical stabilization, inflammatory cytokines, growth factors, vitamins and trace elements are needed for better and faster fracture healing.Though vitamin C and BMPs are implicated in fracture healing, the interactions between them are not known
ANTIMICROBIAL AND ANTIOXIDANT EFFECTS OF SPICE EXTRACTS ON THE SHELF LIFE EXTENSION OF RAW CHICKEN MEAT
(2014-02-03) Radha krishnan K; Babuskin S; Azhagu Saravana Babu P; Sasikala M; Sabina K; Archana G; Sivarajan M; Sukumar M
The antimicrobial and antioxidant effects of different spice extracts in raw chicken meat during storage for 15 days at 4 °C were studied. Raw chicken meat was treated with BHT (positive control), Syzygium aromaticum (SA), Cinnmomum cassia (CC), Origanum vulgare (OV), and Brassica nigra (BN) extracts and the different combinations as well as the results were compared to raw chicken meat without any additive (negative control). The antioxidant and antimicrobial activities of spice extracts were determined. Total phenolic contents and flavonoid contents were ranged from 14.09 ± 0.78 to 24.65 ± 0.83 mg of GAE/g and 7.07 ± 0.15 to 12.13 ± 0.24 mg of quercetin/g, respectively. The pH, instrumental color (CIE L*, a*, b*), total viable counts (TVC), Lactic Acid Bacteria (LAB) counts, Enterobacteriaceae counts, Pseudomonas spp. counts and 2-thiobarbituric acid reactive substances (TBARS) were determined at a gap of 3 days interval for a period of 15 days. The bacterial counts of T-W-SA + T-W-CC + T-W-OV samples were lower than control samples during storage. T-W-SA + T-W-CC + T-W-OV samples maintained significantly (P < 0.05) higher L*, a* and b* values while storing. The TBARS values of T-W-SA + T-W-CC + T-W-OV samples were lowest among the samples. These results show that spice extracts are very effective against microbial growth, lipid oxidation and has potential as a natural antioxidant in raw chicken meats.
LIMITED ADDITION OF THE 6-ARM Β1,2-LINKED N-ACETYLGLUCOSAMINE (GLCNAC) RESIDUE FACILITATES THE FORMATION OF THE LARGEST N-GLYCAN IN PLANTS
(Pub Med, 2015-07-03) Jae, Yong Yoo; Ki, Seong Ko; Hyun-Kyeong, Seo; Seongha, Park; Wahyu, Indra Duwi Fanata; Rikno, Harmoko; Nirmal Kumar, Ramasamy; Thiyagarajan, Thulasinathan; Tesfaye, Mengiste; Jae-Min, Lim; Sang, Yeol Lee; Kyun, Oh Lee
The most abundant N-glycan in plants is the paucimannosidic N-glycan with core β1,2-xylose and α1,3-fucose residues (Man3XylFuc(GlcNAc)2). Here, we report a mechanism in Arabidopsis thaliana that efficiently produces the largest N-glycan in plants. Genetic and biochemical evidence indicates that the addition of the 6-arm β1,2-GlcNAc residue by N-acetylglucosaminyltransferase II (GnTII) is less effective than additions of the core β1,2-xylose and α1,3-fucose residues by XylT, FucTA, and FucTB in Arabidopsis. Furthermore, analysis of gnt2 mutant and 35S:GnTII transgenic plants shows that the addition of the 6-arm non-reducing GlcNAc residue to the common N-glycan acceptor GlcNAcMan3(GlcNAc)2 inhibits additions of the core β1,2-xylose and α1,3-fucose residues. Our findings indicate that plants limit the rate of the addition of the 6-arm GlcNAc residue to the common N-glycan acceptor as a mechanism to facilitate formation of the prevalent N-glycans with Man3XylFuc(GlcNAc)2 and (GlcNAc)2Man3XylFuc(GlcNAc)2 structures.
WHEAT SEEDLINGS AS FOOD SUPPLEMENT TO COMBAT FREE RADICALS: AN IN VITRO APPROACH
(2015-10) P, Ravikumar; G, Shalini; M, Jeyam
The present study was designed to evaluate the antioxidant activity of 5 organic solvent extracts (petroleum ether, n-hexane, chloroform, ethyl acetate and methanol) of wheat grains, 3, 5 and 7 days old wheat seedlings. To determine the antioxidant activity of five extracts of four different samples, 1,1-diphenyl-2-picrylhydrazyl and 2,2'-azinobis-(3-ethylbenzothiazoline-6-sulfonic acid) radical scavenging activity, total phenolic content and ferrous reducing power ability were carried out. 1,1-Diphenyl-2-picrylhydrazyl radical scavenging effect of chloroform and ethyl acetate extracts of 3 days old wheat seedlings was higher than wheat grains. Chloroform, ethyl acetate and methanol extracts of 3 days old wheat seedlings exhibited higher 2,2'-azinobis-(3-ethylbenzothiazoline-6-sulfonic acid) radical scavenging effcet than extracts of other samples. The phenolic content was high in chloroform, ethyl acetate and methanol extract of 5 days old wheat seedlings. When compared with wheat grain, reducing power ability was high in chloroform, ethyl acetate and methanol extract of wheat seedlings, especially in 3 and 5 days old wheat seedlings. From the above results, it was concluded that chloroform, ethyl acetate and methanol extract of 3, 5 and 7 days old wheat seedlings showed better antioxidant activity than the wheat grain extracts. Hence, the results of the present study suggest the intake of wheat seedlings as a food supplement to combat the diseases caused by free radicals.
N-GLYCAN CONTAINING A CORE Α1,3-FUCOSE RESIDUE IS REQUIRED FOR BASIPETAL AUXIN TRANSPORT AND GRAVITROPIC RESPONSE IN RICE (ORYZA SATIVA)
(2016-05-31) Rikno, Harmoko; Jae Yong, Yoo; Ki Seong, Ko; Nirmal Kumar, Ramasamy; Bo Young, Hwang; Eun, Ji Lee; Ho Soo, Kim; Kyung, Jin Lee; Doo-Byoung, Oh; Dool, -Yi Kim; Sanghun, Lee; Yang, Li; Sang Yeol, Lee; Kyun, Oh Lee
In plants, α1,3-fucosyltransferase (FucT) catalyzes the transfer of fucose from GDP-fucose to asparagine-linked GlcNAc of the N-glycan core in the medial Golgi. To explore the physiological significance of this processing, we isolated two Oryza sativa (rice) mutants (fuct-1 and fuct-2) with loss of FucT function. Biochemical analyses of the N-glycan structure confirmed that α1,3-fucose is missing from the N-glycans of allelic fuct-1 and fuct-2. Compared with the wild-type cv Kitaake, fuct-1 displayed a larger tiller angle, shorter internode and panicle lengths, and decreased grain filling as well as an increase in chalky grains with abnormal shape. The mutant allele fuct-2 gave rise to similar developmental abnormalities, although they were milder than those of fuct-1. Restoration of a normal tiller angle in fuct-1 by complementation demonstrated that the phenotype is caused by the loss of FucT function. Both fuct-1 and fuct-2 plants exhibited reduced gravitropic responses. Expression of the genes involved in tiller and leaf angle control was also affected in the mutants. We demonstrate that reduced basipetal auxin transport and low auxin accumulation at the base of the shoot in fuct-1 account for both the reduced gravitropic response and the increased tiller angle.
CELL CYCLE ARREST MEDIATED BY WEE1 IS INVOLVED IN THE UNFOLDED PROTEIN RESPONSE IN PLANTS
(2018-09-10) Ki Seong, Ko; Jae Yong, Yoo; Nirmal Kumar, Ramasamy; Rikno, Harmoko; Bích Ngọc, Thị Vũ; Ji Ye, Park; Kyun, Oh Lee
Activation of the unfolded protein response (UPR) in mammalian cells leads to cell cycle arrest at the G1 phase (Thomas et al., J Biol Chem 288:7606–7617, 2013). However, how UPR signaling affects cell cycle arrest remains largely unknown in plants. Here, we examined UPR and endoreduplication in Col-0, wee1, and ER stress sensing-deficient ire1a&b plants during DNA replication and ER stress conditions. We found that WEE1, an essential negative regulator of the cell cycle, is involved in the maintenance of ER homeostasis during genotoxic stress and the ER stress hypersensitivity of ire1a&b is alleviated by loss-of-function mutation in WEE1. WEE1-mediated cell cycle arrest was required for IRE1–bZIP60 pathway activation during ER stress. In contrast, loss-of-function mutation in WEE1 caused increased expression of UPR-related genes during DNA replication stress. WEE1 and IRE1 were required for endoreduplication during DNA replication stress and ER stress, respectively. Taken together, these findings suggest that cell cycle regulation is associated with UPR activation in different manners during ER stress and DNA replication stress in Arabidopsis.
EFFECT OF ACIDIC, NEUTRAL AND ALKALINE CONDITIONS ON PRODUCT DISTRIBUTION AND BIOCRUDE OIL CHEMISTRY FROM HYDROTHERMAL LIQUEFACTION OF MICROALGAE
(Elsevier, 2018-12) Bo, Zhang; Zhixia, He; Haitao, Chen; Sabariswaran, Kandasamy; Zhixiang, Xu; Xun, Hu; Hongyu, Guo
Hydrothermal liquefaction (HTL) of microalgae produces high amount of water-insoluble organic compounds, the biocrude oil. Using high-growth-rate Spirulina platensis as feedstock, product fraction distribution and biocrude oil chemistry from HTL at a temperature of 240–300 °C under acidic, neutral and alkaline condition were studied. Positive effects on biocrude oil yield were only found with KOH and acetic acid, and these effects were stronger under milder HTL conditions. FT-ICR MS showed that O2 class in the biocrude was high due to higher carbohydrate in the biomass, numbers of N3O5-6 species present in the sample from acetic acid run, indicating its less decarboxylation ability. GC–MS showed more ketones and amides were formed from fatty acids in catalytic HTL, and this effect was sensitive toward reaction temperature. GPC suggested more light volatiles were in biocrude from KOH run, while analysis from NMR, FT-IR and elemental confirmed its high oil quality.
PHYTOCHEMICAL CHARACTERIZATION OF BIOACTIVE COMPOUND FROM THE ENSETE SUPERBUM SEED POWDER
(2018-12-27) R, Nirmal Kumar; P, Muthukumaran; K, Suresh Kumar; R, Karthikeyen
The bioactive components Ensete superbum Seed Powder has been evaluated using GCMS, HPLC, FTIR and HNMR. The chemical compositions of the extract of Ensete superbum Seed Powder was investigated by Gas Chromatography–Mass Spectrometry and GC/MS techniques. The analysis of extract of Ensete superbum Seed Powder revealed that the existence of Eugenol (39.51) n-Hexadecanoic acid (21.97), 9-Eicosyne (5.18), 3-Decanynoic acid(1.87), 1- Tetradecyne(5.30), 7-Methyl-Z-tetradecen-1-ol acetate(1.88), 1-Hexadecyne (9.71), Z-(13,14- Epoxy)tetradec-11-en-1-ol acetate(2.61), Octadecanoic acid (6.01), Tridecanedial (4.78) and cis-13-Eicosenoic acid (1.17). HPLC analysis of Ensete superbum Seed Powder reported that it has mainly contains five flavonoids compounds, namely Gallic acid (5.550 min), Caffeic acid (9.233min), Rutin (10.317min), Quercetin (12.125min) and Ferulic acid (23.200min). The results of FTIR analysis confirmed the presence of Alkynes, Alkanes , Amines , aromatic amines, alkyl halides, alkenes, carboxylic acids and Aromatic Compounds. Further, proton nuclear magnetic resonance spectrum of Ensete superbum Seed Powder was recorded and the chemical shift values of the various signals are identified. The detection of these phytochemical compounds present in the medicinal plants will endow with some information on Ensete superbum Seed Powder as herbal alternative for cure vast array of diseases.
SYNERGISTIC BIO-OIL PRODUCTION FROM HYDROTHERMAL CO-LIQUEFACTION OF SPIRULINA PLATENSIS AND Α-CELLULOSE
(Elsevier, 2019-05-01) Huan, Feng; Zhixia, He; Bo, Zhang; Haitao, Chen; Qian, Wang; Sabariswaran, Kandasamy
Hydrothermal liquefaction (HTL) is a promising technology for the conversion of wet biomass into liquid fuels. In this study, the hydrothermal co-liquefaction (HTCL) of Spirulina platensis and α-Cellulose for bio-oil production was investigated. The bio-oil yield of HTCL was increased significantly by blending α-Cellulose with low-lipid content microalgae of Spirulina platensis in the absence of any catalysts supplementary which reduces the processing cost. The results showed that bio-oil productivity was increased drastically up to 40.33 wt % (28.53 wt % with pure Spirulina platensis and 14.47 wt % with pure α-Cellulose), with a positive synergistic effect (SE) of 16 wt % during the HTCL process. The composition of synthesized bio-oil was analyzed by GC-MS which revealed that HTCL of Spirulina platensis and α-Cellulose are to decrease of its heterocyclic compounds, increased esters and hydrocarbons contents than HTL of pure Spirulina platensis or α-Cellulose. The possible reaction pathways were derived by synthesized bio-oil composition. The maximum energy recovery rate 82% was obtained on HTCL process. The study concluded that, HTCL process is more favorable for the economic concern due to high convention of bio-oil efficiency.
EFFECTS OF THE AQUEOUS PHASE RECYCLING ON BIO-OIL YIELD IN HYDROTHERMAL LIQUEFACTION OF SPIRULINA PLATENSIS, Α-CELLULOSE, AND LIGNIN
(Elsevier, 2019-07-15) Haitao, Chen; Zhixia, He; Bo, Zhang; Huan, Feng; Sabariswaran, Kandasamy; Bin, Wang
The utilization of hydrothermal liquefaction (HTL), an efficient thermochemical conversion technology, can produce biofuels from biomass, but also a large amount of processing wastewater. In the present paper, the aqueous phase from the HTL of Spirulina Platensis was recycled as the intermediate reactant and its effects on the bio-oil yield from the HTL of Spirulina Platensis, α-Cellulose, and Lignin were investigated. The results revealed that the best bio-oil yields obtained from HTL of Spirulina Platensis and α-Cellulose in pure water were 30 and 7.03 wt% at the optimized operation conditions. Aqueous phase obtained from HTL of Spirulina Platensis could be introduced return into HTL system and result in an obvious increase in the bio-oil yield by 10 wt% and 6 wt% from HTL of Spirulina Platensis and α-Cellulose, respectively. Energy recovery rates from bio-oil were improved greatly by applying aqueous phase recycling during HTL. However, aqueous phase recycling inhibited generation of bio-oil, suggesting the presence of the antagonistic reaction between protein aqueous and Lignin. Based on the gas chromatography-mass spectrometer (GC-MS) and fourier transform infrared spectroscopy (FT-IR) analysis of the aqueous phase and bio-oil, the possible reaction pathways were deduced.
HYDROTHERMAL LIQUEFACTION OF FRESH LEMON-PEEL: PARAMETER OPTIMISATION AND PRODUCT CHEMISTRY
(Elsevier, 2019-12) Bo, Zhang ; Jixiang, Chen; Zhixia, He; Haitao, Chen; Sabariswaran, Kandasamy
Large amounts of food wastes, such as fruit peels, are released into the environment without proper treatment every year. Fruit peels are also a potential bio-resource that can be converted into useful chemicals. Due to the high moisture content of the peels, hydrothermal liquefaction was introduced to convert the fresh lemon-peel to biocrude oil in this study. The optimisation based on the response surface methodology was applied to parameters including temperature, reaction time and feedstock concentration. The highest oil yield around 18 wt% was achieved under the optimised settings of 336 °C, 50 min, and 9.6 wt% feedstock loading. GC-MS identified a large number of ketones in the biocrude, while few fatty acids and N & O containing compounds compared with that from microalgae. A higher percentage of the biocrude can be distilled compared with the microalgae oil, indicating more volatiles within the lemon-peel liquefied oil.
GROWTH REGULATION AND PROTEOMIC APPROACHES OF EXOGENOUS ABSCISIC ACID INDUCED CHANGES ON SALT TOLERANCE FACTORS IN SUAEDA MARITIMA
(Plant Physiology Reports, 2020) Anbarasi G; Somasundaram S.T
Salinity is one of the most imperative global problems that affect the crop productivity on a large scale. Salinity impairs plant growth and development by imposing various stresses and it is vital to decode those stress factors and to identify possible solutions to improve agriculture productivity. It is essential to study those plants with known resistance to increased salinity in order to produce commercial crops which can survive on salt stress conditions. There are several plant species that possess exceptional physiological uniqueness which critically influences environmental adaptation. However, the adaptive mechanisms under saline conditions of halophytes have not yet been clearly distinguished. In this backdrop, the present study was undertaken to determine the effects of exogenous application of abscisic acid on salinity tolerance in Suaeda maritima. The observed data from the present study confirms that the abscisic acid pretreatment has enhanced the plant biomass, water relations and ion content. There was also a stimulated increase in the content of chlorophyll pigment and inorganic osmolytes accumulation. Comparative proteomic analysis was performed to investigate the changes in protein profiles of both the treated and untreated plants. Among the expressed proteins, 5.25 PI/48 MW spot exhibited twofold decrease in NaCl treatment and sixfold increases in ABA pretreated plants. The protein spot had a match with a significant score of 94% in the closely related SKP1-like protein 1A (Sesamum indicum). Hence, the present study supports ABA-mediated stress response is co-regulated by SKP1.
MOLECULAR CHARACTERIZATION OF PAPAYA RING SPOT VIRUS ISOLATES FROM DIFFERENT PARTS OF TAMIL NADU
(2021-03-02) Nirmal Kumar, Ramasamy; V.G, Shobana; R, Kannan; P, Muthukumaran; K, Angappan
An attempt has been made to characterize different PRSV isolates which infects papaya plants were collected from different parts of Tamil Nadu. The isolates were of PRSV-P type strain and the Coat Protein gene (CP) varied in size from 840- 860 bp which encodes 280 - 284 amino acids. Sequence alignment results revealed that the seven sequences obtained from different regions shared a homology of about 90% -95% with each other and homology of about 96% with the already reported Indian isolate and 88-90% with the other country isolates collected from NCBI. KE repeats were observed in the N terminus of the CP coding region from the different isolates found out. Phylogenetic analysis revealed that the isolates identified here placed on the same group and reference isolates were grouped in a different progeny. Our study further helped us to identify conserved regions among the seven isolates and we also constructed an RNAi silencing vector targeting Coat protein gene to challenge the Papaya Ring Spot Virus (PRSV) for our future study
A REVIEW OF MICROBIAL CONTAMINATION IN PROCESSED AND STREET FOODS
(2021-06-03) Muthukumaran P; Karthikeyan R; Nirmal Kumar R
As a basic physiology need threat to sufficient food, production is threat to human survival food security was a main issue that has gained global concern. This paper looks at the food borne contamination by assessing the availability of food and accessibility of the available food from a food as a microbiologist’s perspective, there are several microorganisms similarly viruses, bacteria, fungi, protozoans, and parasites for which foods serve as vehicles of transmission. Among these agents, several bacteria are most commonly implicated in foodborne outbreak episodes. Foodborne diseases in human beings are caused either by straight contact with infested food animals/animal products (zoonotic) or humans, such as a food handler, or by direct absorption of polluted foods. There are three important terms with regard to foodborne diseases foodborne infections, foodborne toxicoinfections and foodborne intoxications. Foodborne infection is the condition caused by the incorporation of viable cells of a pathogen. For example, Salmonella Enteritidis and Escherichia coli infections are brought about by the ingestion of food contaminated with living cells of these pathogens. Finally, foodborne toxicoinfection is that in which the ingestion of viable pathogenic cells causes the toxins productions inside the human body, leading to infection episodes. For example, Vibrio cholerae produces cholera toxin inside the body after being ingested by the host. The morphology, Gram’s reaction, biochemical properties, and associated foods with important foodborne bacteria.
AG AND AU NANOPARTICLES DECORATED ON SYNTHETIC CLAY FUNCTIONALIZED MULTI-WALLED CARBON NANOTUBE FOR OXYGEN REDUCTION REACTION
(SpringerLink, 2021-06-03) Narayanamoorthy, Bhuvanendran; Sabarinathan, Ravichandran; Sabariswaran, Kandasamy; Huaneng, Su
A novel clay (aminoclay, AC) functionalized multi-walled carbon nanotube (MWCNT) was employed as a novel hybrid supporting material to Ag and Au nanoparticles for the improvement of oxygen reduction reaction (ORR). The size and structure of the catalysts were studied by XRD and electron microscopy analysis, revealing that the average crystallite and particle size was about 3.4 and 2.6 nm for Au and 16.2 and 15.3 nm for Ag nanoparticles, respectively. The ORR performance was probed by employing the voltammetry techniques under static and hydrodynamic conditions. The results show that the electrochemical surface area of Au (57.5 m2/g) and Ag (17.8 m2/g) on AC/MWCNT are larger than that of AC-free catalysts, and the ORR mechanism follows a direct 4-electron transfer pathway. The supported Au and Ag on AC/MWCNT catalysts explicitly showed the enhanced electrocatalytic efficiency and activity on ORR than that of the AC-free MWCNT catalysts. This work demonstrates that developing surface functionalized carbon support using an inorganic silicate layer (clay minerals) as hybrid support for the persistence of active metal catalysts could be a promising strategy for advanced LT-AFCs ORR electrocatalysts.
A REVIEW OF MICROBIAL CONTAMINATION IN PROCESSED AND STREET FOODS
(Skyfox Publishing Group, 2021-06-30) Muthukumaran P; Karthikeyan R; Nirmal Kumar R
As a basic physiology need threat to sufficient food, production is threat to human survival food security was a main issue that has gained global concern. This paper looks at the food borne contamination by assessing the availability of food and accessibility of the available food from a food as a microbiologist’s perspective, there are several microorganisms similarly viruses, bacteria, fungi, protozoans, and parasites for which foods serve as vehicles of transmission. Among these agents, several bacteria are most commonly implicated in foodborne outbreak episodes. Foodborne diseases in human beings are caused either by straight contact with infested food animals/animal products (zoonotic) or humans, such as a food handler, or by direct absorption of polluted foods. There are three important terms with regard to foodborne diseases foodborne infections, foodborne toxicoinfections and foodborne intoxications. Foodborne infection is the condition caused by the incorporation of viable cells of a pathogen. For example, Salmonella Enteritidis and Escherichia coli infections are brought about by the ingestion of food contaminated with living cells of these pathogens. Finally, foodborne toxicoinfection is that in which the ingestion of viable pathogenic cells causes the toxins productions inside the human body, leading to infection episodes. For example, Vibrio cholerae produces cholera toxin inside the body after being ingested by the host. The morphology, Gram’s reaction, biochemical properties, and associated foods with important foodborne bacteria.