Fungus Aspergillus Niger Research Articles

Synthesis, characterization, and biological activities of five new trivalent lanthanide complexes of hydrazine and 3,3’-thiodipropanoic acid

Some new hydrazine complexes of trivalent lanthanide 3,3’-thiodipropanoates of empirical formulae [M(N2H5)(tdp)2] and [Pr(N2H5)(tdp)2·H2O], where M = La, Ce, Sm and Nd, H2tdp = 3,3’-thiodipropanoic acid, have been prepared and characterized by elemental analysis, mass, FTIR, Raman and electronic spectral, powder X-ray diffraction, scanning electron microscopy (SEM) and simultaneous TG–DTA techniques. The presence of bidentate carboxylate anion and coordinated N2H5 in these complexes are confirmed by IR spectra. TGA/DTA results confirmed that all the rare earth metal complexes give the corresponding metal carbonate (heating up to 1000 °C) through a metal oxalate intermediate. SEM images of Pr2O3 residue obtained from its complex show nano-sized clusters, thus the complex may be used as a precursor for nano-Pr2O3 preparation. The synthesized complexes show good antimicrobial activity against six bacteria (Bacillus cereus, Staphylococcus aureus, Proteus vulgaris, Pseudomonas aeruginosa, Escherichia coli, and Serratia species) and four fungi (Candida albicans, Aspergillus niger, Aspergillus fumigatus, and Penicillium variance) as assessed by in vitro biological activity.

A novel series of dipeptide derivatives containing indole-3-carboxylic acid conjugates as potential antimicrobial agents: the design, solid phase peptide synthesis, in vitro biological evaluation, and molecular docking study.

A new library of peptide-heterocycle hybrids consisting of an indole-3-carboxylic acid constituent conjugated with short dipeptide motifs was designed and synthesized by using the solid phase peptide synthesis methodology. All the synthesized compounds were characterized by spectroscopic techniques. Additionally, the synthesized compounds were subjected to in vitro antimicrobial activities. Two Gram-negative bacteria (Escherichia coli and Pseudomonas aeruginosa) and two Gram-positive (Streptococcus pyogenes and Staphylococcus aureus) were used for the evaluation of the antibacterial activity of the targeted dipeptide derivatives. Good antibacterial activity was observed for the screened analogues by comparing their activities with that of ciprofloxacin, the standard drug. Also, two fungi (Aspergillus niger and Candida albicans) were employed for the evaluation of the antifungal activity of the synthesized compounds. When compared to the standard drug Fluconazole, it was observed that the screened analogues exhibited good antifungal activity. In continuation, all the synthesized derivatives were subjected to integrated molecular docking studies and molecular dynamics simulations to investigate binding affinities, intermolecular interaction networks, and conformational flexibilities with deoxyribonucleic acid (DNA) gyrase and lanosterol-14-alpha demethylase. The molecular docking studies revealed that indole-3-carboxylic acid conjugates exhibited encouraging binding interaction networks and binding affinity with DNA gyrase and lanosterol-14 alpha demethylase to show antibacterial and antifungal activity, respectively. Such synthesis, biological activity, molecular dynamics simulations, and molecular docking studies of short peptides with an indole conjugate unlock the door for the near future advancement of novel medicines containing peptide-heterocycle hybrids with the ability to be effective as antimicrobial agents.

Highly effective biosorption capacity of Cladosporium sp. strain F1 to lead phosphate mineral and perovskite solar cell PbI2.

Fungus Cladosporium sp. strain F1 showed highly effective biosorption capacity to lead phosphate mineral and perovskite solar cells lead iodide compared to other fungi Aspergillus niger VKMF-1119 and Mucor ramannianus R-56. Scanning electron microscopy and transmission electron microscopy analyses shows that Cladosporium sp. strain F1, which previously showed high biosorption capacity to uranium phosphate nanorods and nanoplates, can accumulate lead phosphate mineral and lead iodide on the fungal hyphae surface in large amounts under a wide range of pH conditions, while A. niger VKMF-1119 and M. ramannianus R-56 adsorbed small amounts of minerals. After biosorption of lead iodide minerals on Cladosporium sp. strain F1, aqueous dimethyl sulfoxide (50%) at pH 2 (70°C) released the mineral more than 99%. Based on the fungal surface analyses, hydrophobic properties on the surfaces of Cladosporium sp. strain F1 could affect the higher biosorption capacity of strain F1 to lead phosphate mineral and lead iodide as compared to other tested fungi. Cladosporium sp. strain F1 may be the novel biosorbents to remediate the phosphate rich environment and to recover lead from perovskite solar cells lead iodide.

Isolation and Identification of Aspergillus Species from Soil Sample, Hindu College, Guntur

Aspergillus species are utilized in the fermentation industry. The investigation is aimed to find out the fungal diversity, also to isolate and identify the Aspergillus species in the soil samples collected in Hindu College campus, Guntur. For this isolation and identification, plating, pure culturing, incubating, staining, inoculating such techniques are used. The mycelia and cytoplasm are stained using Lactophenol and cotton blue (provides light blue background). The stained specimens are observed under the microscope for identification and photographs are taken. Among the identified species the Keratinophilic fungi Aspergillus Niger is found in maximum numbers in the campus and followed by others. All the isolates are identified with standard key and microbial expert.

Mechanical and Physical Properties of Biodegradable Foams Made from Sorghum Fiber and Rice Straw for Food Packaging Applications

This study investigates the potential of agricultural by-products, rich in lignocellulosic materials, as sustainable food packaging materials to mitigate the environmental issues associated with nonbiodegradable plastics and styrofoam. Starch-based biodegradable food trays were developed using agricultural by-products, including sorghum stalk, rice straw, and kraft pulp through thermopressing method. By combining varying proportions of polyvinyl alcohol (PVA) and a sorghum-rice straw fiber mixture, biodegradable foam products with notable strength, water resistance, and cost-effectiveness for large-scale production were produced, exhibiting densities between 0.7 and 0.8 gr/m³. Notably, a 5% PVA composition in the sorghum fiber biodegradable foam displayed favourable mechanical properties and water resistance, with a tensile strength of 5 MPa and a contact angle of 73.79°, coupled with an appealing physical appearance. However, increasing PVA concentration beyond this level had negligible effects, indicates the optimal limit of PVA. Additionally, the distinct roles of rice straw powder as a matrix and sorghum fiber as reinforcement within the biodegradable foam were identified. Biodegradation tests revealed natural decomposition starting from the seventh day, with over 95% growth of Aspergillus Niger fungus, suggesting that these biodegradable foam products hold promise for mass production in the packaging industry, presenting a sustainable alternative to conventional plastic packaging.

Enumeration of Most Common Microbes Responsible for Tomatoes Spoilage

This study investigated the microorganisms associated with the spoilage of tomato (Lycopersicum esculentum) obtained from two markets in Jahun town, Jahun Local Government in Jigawa State, Nigeria. A total of five species of bacteria were isolated and identified viz: Bacillus subtilis, B. aureus, Escherichia coli, Klebsiella aerogenes and Staphylococcus aureus. The most prevalent bacterial isolate was Bacillus subtilis with 24% and was found in all samples from the two markets. Klebsiella aerogenes was the least prevalent isolate with 0.8% and was found in samples from Jahun Central Market only. The fungal isolates were Penicilium notatum, Mucor mucido and Aspergillus niger. Whereas, Mucor mucido was the most prevalent with 26.4% and was found in fruit samples from all the markets, Penicillium notatum had the least prevalence of 7.3% and occurred both in Jahun Central and Kabala Markets. The mean microbial count ranges were 10 to 40 × 104 CFU/g for Jahun Central Market and 5 to 30 × 104 CFU/g Kabala Market. The presence of toxin producing fungi Aspergillus niger, which are capable of causing food poisoning as well as some bacterial isolates raises concern over public health risks that may be associated with the consumption of spoiled tomato fruits.

Study of Mycotoxin from Infected Jawar and Bajra by using Fungus Aspergillus niger

Study of Mycotoxin from Infected Jawar and Bajra by using Fungus Aspergillus niger

Whole-genome sequencing of biofilm-forming and chromium-resistant mangrove fungus Aspergillus niger BSC-1

Filamentous fungus Aspergillus niger has gained significant industrial and ecological value due to its great potential in enzymatic activities. The present study reports the complete genome sequence of A. niger BSC-1 which was isolated from Indian Sundarban mangrove ecosystem. The study revealed that the genome of A. niger BSC-1 was 35.1 Mbp assembled in 40 scaffolds with 49.2% GC content. A total of 10,709 genes were reported out of which 10,535 genes were predicted for encoding the proteins. BUSCO assessment showed 98.6% of genome completeness indicating high quality genome sequencing. The genome sequencing of A. niger BSC-1 revealed the presence of rodA and exgA genes for initial adhesion to surface and Ags genes for matrix formation, during biofilm growth. OrthoVenn2 analysis revealed that A.niger BSC-1 shared 9552 gene clusters with the reference strain A. niger CBS554.65. Semi-quantitative RT-PCR analysis unveiled the role of Ags1 and P-type ATPase in fungal biofilm formation and chromium (Cr) resistance, respectively. During biofilm growth the expression of Ags1 significantly (P < 0.0001; two-way ANOVA followed by Sidak's multiple comparisons test) increased with respect to planktonic culture revealing the possible involvement of Ags1 in biofilm matrix formation. Expression of P-type ATPase gene was significantly upregulated (P < 0.0001; one-way ANOVA followed by Dunnett's multiple comparisons test) with the increasing chromium concentration in the fungal culture. Besides, several other genes encoding metalloprotease, copper and zinc binding proteins, and NADH-dependent oxidoreductase were also found in the genome of A. niger BSC-1. These proteins are also involved in heavy metal tolerance and nanofabrication indicating that this filamentous fungus A. niger BSC-1 could be potentially utilized for chromium detoxification through biofilm or nanobiremediation.

Fodder radish aqueous extracts and associated rhizobacteria as bio-stimulants on tomato growth

ABSTRACT Use of bio-stimulants can reduce amounts of synthetic chemicals for improving tomato (Solanum lycopersicum L.) growth and production. The investigation evaluated the rhizobacterial isolates B45, B46, B48, B54 and B55 associated with fodder radish (Raphanus sativus L.) and its aqueous extracts for their ability to promote growth of tomato plants under greenhouse conditions. Rhizobacteria were applied by root dipping followed by seedling drenching at planting. The isolates were characterized, based on macro-morphological and biochemical traits, and mechanisms involved in Plant Growth-Promoting (PGP) features were explored. For direct PGP traits, isolates were able to fix nitrogen on N-free agar medium. Isolates B45, B46, B54 and B55 were positive for indole-3-acetic acid production; isolates B46, B48 and B55 were positive for phosphate solubilization with the highest activity exhibited by B46. For indirect PGP traits, isolates were chitinase-, lipase-, and amylase-producing agents. Based on phylogenetic analysis of the 16S rDNA, the most bioactive isolate B46 was affiliated to Bacillus vallismortis (OK083726). All isolates displayed antifungal activity against soil-borne fungi Aspergillus niger, Penicillium digitatum, Fusarium oxysporum, F.sambucinum, and Trichoderma harzianum. Fodder radish aqueous extracts were tested at 5, 7.5, 10 or 15% (w:v). Chemical characterization by spectrophotometer of compounds indicated presence of auxin and polyphenols. Fodder radish aqueous extract displayed antifungal activity against all fungal species. Fodder radish appears to be a natural source for isolation of potent PGP rhizobacterial isolates and/or secondary metabolites bioactive for promotion of tomato growth and with an antifungal potential.

A Series of Dipeptide Derivatives Containing (S)‐5‐Oxo‐pyrrolidine‐2‐carboxylic acid Conjugates: Design, Solid‐Phase Peptide Synthesis, in vitro Biological Evaluation, and Molecular Docking Studies

AbstractUtilizing the solid phase peptide synthesis protocol, we have designed and prepared a novel dipeptide library containing (S)‐5‐oxopyrrolidine‐2‐carboxylic acid moiety. All the newly synthesized dipeptides were characterized by spectroscopic techniques as well as elemental analysis. Furthermore, the in vitro antimicrobial activities of the synthesized dipeptide conjugates were evaluated. Two Gram‐positive (Streptococcus pyogenes and Staphylococcus aureus) and two Gram‐negative bacteria (Escherichia coli and Pseudomonas aeruginosa) were utilized to evaluate the antibacterial activity of the screened derivatives. In contrast to the standard drug Ampicillin, the targeted derivatives exhibited good antibacterial activity. Additionally, two fungi (Candida albicans and Aspergillus niger) were used to evaluate the antifungal activity of the target dipeptides. The targeted derivatives also exhibited good antifungal activity compared to the standard drug Nystatin. In continuous, the molecular docking study of the targeted derivatives was also carried out, which revealed that the dipeptide analogs showed encouraging binding interaction networks with Escherichia coli DNA gyrase B and lanosterol‐14 alpha demethylase resulting in antibacterial and antifungal activities, respectively. Such synthesis, biological evolution, and molecular docking study of peptide derivatives with oxopyrrolidine conjugates open the door for the future development of new therapeutics containing heterocycle and peptide hybrids with potency as antimicrobial agents.

Eco-Friendly Low Concentration Silver Nanoparticles Acquiring Cotton Textile Antifungal Activities for Pulmonary Aspergillosis Protection

Aspergillosis is a fungal infection cause reduction or suppression of innate immune system. Occasionally silver nanoparticles showed antibacterial activity rather than anti-fungal activity. In the current paper three different shapes and concentrations of silver nanoparticles (AgNPs) were synthesized using dextrin and starch, then applied to cotton for acquiring antifungal properties. TEM illustrates the size, shape and homogeneity of the AgNPs. Atomic absorption spectroscopy (AAS) quantified the AgNPs in the colloidal solution. Attenuated total reflection ATR/FT-IR spectroscopy and scanning electron microscope (SEM) coupled with Energy Dispersive X-Ray Analysis (EDX) to screen the homogeneity and dispersion of the AgNPs. Different shapes (rode and triangular) of AgNPs (10-17nm) were produced using 10~5 ppm of the AgNPs. Antifungal activity towards Aspergillus Niger fungus was documented using the disc diffusion method. Cotton treated with AgNPs showed significant effective antifungal properties at lower concentrations (~10 ppm) preserving its white color compared to the higher concentrations (&gt;100 ppm)of the AgNPs. Manufactured cotton fabrics treated with low concentrations of AgNPs were examined towards the recognition of the antifungal properties with minimal industrial footprint which may expose a novelpossibility for antifungal applications.

Fouling Resistance and Release Properties of Poly(sulfobetaine) Brushes with Varying Alkyl Chain Spacer Lengths and Molecular Weights

We examined the effects of alkyl carbon spacer length (CSL) and molecular weight on fouling resistance and release properties of zwitterionic poly(sulfobetaine methacrylate) brushes. Using surface-initiated atom transfer radical polymerization, we synthesized two series of brushes with CSL = 3 and 4 and molecular weight from 19 to 1500 kg ·mol-1, corresponding to dry brush thickness from around 6 to 180 nm. The brush with CSL = 3 was nearly completely wet with water (independent of molecular weight), whereas the brush with CSL = 4 exhibited a strong increase in water contact angle with molecular weight. Though the two-brush series had distinct wetting properties, both series of brushes exhibited similarly great resistance against fouling by Staphylococcus epidermidis bacteria and Aspergillus niger fungi spores when submerged in water, indicating that neither molecular weight nor CSL strongly affected the antifouling behavior. We also compared the efficacy of brushes against fouling by fungi and silicon oil in air. Brushes grafted to filter paper were strongly fouled by fungi and silicon oil in air. Grafting the polymers to the filter paper, however, greatly enhanced removal of the foulant upon rinsing. The removal of fungi and silicon oil when rinsed with a salt solution was enhanced by 219 and 175%, respectively, as compared to a blank filter paper control. Thus, our results indicate that these zwitterionic brushes can promote foulant removal for dry applications in addition to their well-known fouling resistance in submerged conditions.

Investigation of Biofabricated Iron Oxide Nanoparticles for Antimicrobial and Anticancer Efficiencies

Capparis zeylanica leaf extract was employed in this work to create iron oxide nanoparticles (α-Fe2O3) using anhydrous ferric chloride. The UV spectrum, XRD, FT-IR, and FE-SEM with EDX methods were used to characterize the fabricated nanoparticles. The iron oxide nanoparticles obtained were spherical in form, with an average crystallite size of 28.17 nm determined by XRD. The agar well diffusion method was used to assess the antimicrobial activity of the α-Fe2O3 nanoparticles created in this study against pathogenic organisms, Gram-negative bacteria (Escherichia coli and Pseudomonas aeroginosa), Gram-positive bacteria (Staphylococcus aureus and Streptococcus pyogenes), and fungi (Candida albicans and Aspergillus niger). Among the pathogens tested, S. pyogenes had the highest zones of inhibition (25 ± 1.26 mm), followed by S. aureus (23 ± 0.8 mm), E. coli (23 ± 2.46 mm), P. aeroginosa (22 ± 1.86 mm), C. albicans (19 ± 2.34 mm) and A. niger (17 ± 3.2 mm). The substance was further tested for anticancer activity against A549 (lung cancer) cells using the MTT assay. The cytotoxic reaction was found to be concentration-dependent. The present study, therefore, came to the conclusion that the bio-effectiveness of the manufactured α-Fe2O3 nanoparticles may result in applications in biomedical domains.

Mold and Stain Resistance of Bamboo Treated with Pyraclostrobin Fungicide.

Bamboo is rich in starch and sugars and can be infected by mold and stain fungi, degrading its performance, shortening its service life, and reducing its utilization value. It is crucial to investigate how to protect bamboo against mold and stain fungi. The zone of inhibition test was used to evaluate the antifungal activity of azoxystrobin, kresoxim-methyl, pyraclostrobin and 3-iodo-2-propynyl-butylcarbamate (IPBC) against stain fungi (Botryodiplodia theobromae, Fusarium moniliforme, and Alternaria alternate) and mold fungi (Aspergillus niger, Penicillium citrinum, and Trichoderma viride) to develop new chemicals to protect bamboo against stain fungi and molds. The inhibitory activity of the composite pyraclostrobin and IPBC with different ratios was evaluated. Water-based formulations of the fungi were used to treat the bamboo, and the mold and stain resistance of the bamboo was investigated at different chemical retention rates. The results showed that the antifungal activity of pyraclostrobin was significantly higher than that of azoxystrobin and kresoxim-methyl. Different degrees of inhibitory activities against the stain and mold fungi were observed, and the inhibitory activity was higher against stain fungi than against molds. The three stain fungi were completely inhibited at a 7:3 ratio of pyraclostrobin to IPBC and 0.1% concentration. As the ratio increased, the inhibitory effect against mixed mold strains improved. The control efficacy of the pyraclostrobin formulations Str-1 and Str-2 at 0.1% concentration was 100% against Alternaria alternate and 70.8% against Fusarium moniliforme. The control efficacy of the composite formulations SI-1 and SI-2 at 0.1% concentration was 100% against all three stain fungi and greater than 91.8% against the mixed mold strains. This study provides new insights into the utilization of pyraclostrobin and its composite formulations as new bamboo antifungal agents.

IMPLICATION OF HEAVY METAL TOLERANCE ON MICROBIAL COLONY SIZE

In this study, we evaluated the effect of heavy metals on colony size of microbes isolated from mechanic workshop soils in Iganmu and Bariga areas of Lagos state, Nigeria. Heterotrophic microbial counts in Bariga samples ranged from 3.74 × 105 to 2.98 ×106 and 9.5 × 104 to 5.4 × 105cfu/ml for bacterial and fungal isolates respectively. While for Iganmu, heterotrophic counts ranged from 2.73 × 105 to 1.46 × 106 and 5.1 × 104 to 3.8 × 105cfu/ml for bacteria and fungi respectively. To evaluate heavy metal tolerance and establish its relationship with colony morphology especially colony size, the isolated strains were subjected to PbCl2, NiSO4 and CdCl2 and a combination of the three heavy metal salts in the same ratio. After 96 hours, larger bacterial and fungal colonies (&gt;100?m) were observed from 100-400mg/L and moderate (&gt;50?m) to small (&lt;25?m) colonies from 800-3200mg/L of individual heavy metals. The combination of heavy metals produced greater reduction in colony size at concentrations ranging from 300-1500mg/L. The various heavy metal tolerant bacteria (Bacillus subtilis, B.megaterium, Pseudomonas aeruginosa, P.fluorescens, Acinetobacter baumanniiand Staphylococcus aureus) were identified using analytical profile index (API) kits while fungi (Aspergillus niger, A. tamari, A.flavus, Rhizopusstolonifer, R.arrhizusand Fusarium oxysporium) were identified by standard microbiological methods. The study established a positive correlation between microbial colony size and heavy metal concentration

Study of the culture medium variation in the production of secondary metabolite pyrophen by endophytic fungus Aspergillus niger from Harconia speciosa

Pyrophen, a natural product, is a pyrone derivative from L-phenylalanine and isolated from different Aspergillus species. This compound exhibits promising anticancer activity, and various studies on its synthesis and biological activity have been reported. Thus, this study aimed to understand the substrate-related factors that influence the production of pyrophen and fungal biomass. So, the endophytic fungus Aspergillus niger, isolated from the plant species Hancornia speciosa (commonly known as mangabeira), was cultivated in different culture media (PDB, CZAPEK, and mangaba juice), ethyl acetate extracts were obtained for these different culture media. A high-performance liquid chromatography method was developed with a PDA detector to quantify pyrophen in these different extracts. This method evaluated the effect of other varying culture media and fungal growth times on the yield of this substance. The highest yield was obtained with the mangaba juice, thus revealing that this medium was better for cultivation. Finally, evaluation of the effect of cultivation time in PDB (Potato Dextrose Broth) medium reveals that the ideal fermentation period to produce pyrophen.

Biochemical characterization of a glycoside hydrolase family 43 β-D-galactofuranosidase from the fungus Aspergillus niger

β-D-Galactofuranose (Galf) and its polysaccharides are found in bacteria, fungi and protozoa but do not occur in mammalian tissues, and thus represent a specific target for anti-pathogenic drugs. Understanding the enzymatic degradation of these polysaccharides is therefore of great interest, but the identity of fungal enzymes with exclusively galactofuranosidase activity has so far remained elusive. Here we describe the identification and characterization of a galactofuranosidase from the industrially important fungus Aspergillus niger. Analysis of glycoside hydrolase family 43 subfamily 34 (GH43_34) members via conserved unique peptide patterns and phylogeny, revealed the occurrence of distinct clusters and, by comparison with specificities of characterized bacterial members, suggested a basis for prediction of enzyme specificity. Using this rationale, in tandem with molecular docking, we identified a putative β-D-galactofuranosidase from A. niger which was recombinantly produced in Escherichia coli. The Galf-specific hydrolase, encoded by xynD demonstrates maximum activity at pH 5, 25 °C towards 4-nitrophenyl-β-galactofuranoside (pNP-β-Galf), with a Km of 17.9 ± 1.9 mM and Vmax of 70.6 ± 5.3 µM min−1. The characterization of this first fungal GH43 galactofuranosidase offers further molecular insight into the degradation of Galf-containing structures.

Investigation of fungi accompanying wheat grains at wheat cultivation areas in Iraq and the possibility of diagnosing it

The aim of this study was isolating and diagnosing the fungi accompanying the harvested wheat grains for the 2021 agricultural season, at some Iraqi provinces: Erbil, Sulaymaniyah, Mosul, Najaf, Karbala, Qadisiyah, Muthanna, ThiQar and Basra. The results of the field survey showed the accompanying fungi Alternaria sp, Aspergillus flavus, Aspergillus niger, Fusarium sp, Mucor, Penicillium sp, Rhizopus sp and other fungi. The results confirmed that the two genus, A. flavus and Alternaria sp, were the most prominent in all Iraqi provinces, with mean of 35.84 % for A. flavus and 25.36 % for Alternaria sp, followed by A. niger, and then both the fungi Fusarium sp, Rhizopus sp, Penicillium sp and Mucor, with mean 20.008, 5.20, 4.61, 2.20 and 0.63%, respectively. The incidence of other undiagnosed fungi was 6.09%, the genus A. niger recorded the highest occurrence in the provinces of ThiQar and Mosul with 45 and 40%, respectively, it was less visible in Erbil by 2.73%. It was also noted that the genus Fusarium sp recorded its highest occurrence in the provinces of Erbil and ThiQar with a percentage of 10.95 and 10%, while it was not recorded in the holy province of Karbala, the percentage of its occurrence varied in the rest of the provinces. The fungus Mucor sp recorded 2.94, 2.5, 1.4 and 1.35% at the provinces of Qadisiyah, ThiQar, Sulaymaniyah and Muthanna, respectively, while it was not recorded in the rest of the provinces. The genus Penicillium sp recorded occurrences in some Iraqi provinces by 5.47% in Erbil province and 4.83 and 4.41% in Karbala and Qadisiyah provinces, respectively, the percentage of his occurrence was 1.4% in Sulaymaniyah province and 1.26 in Najaf. The rest of the provinces did not record his occurrence. As for the genus Rhizopus sp, it appeared on wheat grains in most of the Iraqi provinces in different proportions, the highest percentage of its occurrence was in Basra Province, with 11.11%, did not record his occurrence in the province of Qadisiyah, while the results showed that A. flavus was the most frequent fungus at the level of the provinces under study, with a frequency of 22.77%. The fungus Alternaria sp ranked second with a frequency of 16.22%, where it was observed that the highest frequency was for A. flavus in the provinces of Muthanna and Najaf Al-Ashraf by 43% and 34%, respectively.The process of molecular diagnosis using polymerase chain reaction (PCR) technology for the most frequent isolate showed that it belongs to the genus Aspergillus flavus, it showed a 90% concordance with global isolates. The nucleotide sequence of the isolate has been deposited in GenBank under accession number ON932490.

Cloning, Isolation, and Properties of a New Recombinant Tannase from the Aspergillus niger Fungus

Cloning, Isolation, and Properties of a New Recombinant Tannase from the Aspergillus niger Fungus

New Bicyclic Lactone by Biotransformation of β-caryophyllene using Aspergillus niger

Abstract: Microbial transformation of β-caryophyllene (1) by suspended cell cultures of the plant pathogen fungus Aspergillus niger, resulted in the production of one major metabolite. This metabolite was identified as (3aR,11aS, E)-9-methyl-4-methylene-3a,4,7,10,11,11a-hexahydro-2H-furo[3,2- c]oxecine-2,6(3H)-dione (2), by different spectroscopic methods. Metabolite 2 was found to be a new compound. The proposed pathway for the synthesis of compound 2 was also explained.