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https://www.readbyqxmd.com/read/29315745/aspergillus-niger-mutants-affected-in-conidial-pigmentation-do-not-have-an-increased-susceptibility-to-water-stress-during-growth-at-low-water-activity
#1
Frank J J Segers, Han A B Wösten, Jan Dijksterhuis
Aspergillus niger forms conidia that contain melanin in their cell wall. This black pigment has been shown to protect fungi against UV-radiation and experimental evidence has indicated that it also protects against drought and high salt concentrations. In this study, growth of A. niger was evaluated at low water activity (aw ) and after changes in relative humidity (RH). In addition, deletion strains of A. niger affected in the melanin synthesis pathway were compared. Germination of conidia of the wild-type and deletion strains was observed at 0...
January 8, 2018: Letters in Applied Microbiology
https://www.readbyqxmd.com/read/29275441/corrosive-extracellular-polysaccharides-of-the-rock-inhabiting-model-fungus-knufia-petricola
#2
Romy Breitenbach, Dorothee Silbernagl, Jörg Toepel, Heinz Sturm, William J Broughton, Guilherme L Sassaki, Anna A Gorbushina
Melanised cell walls and extracellular polymeric matrices protect rock-inhabiting microcolonial fungi from hostile environmental conditions. How extracellular polymeric substances (EPS) perform this protective role was investigated by following development of the model microcolonial black fungus Knufia petricola A95 grown as a sub-aerial biofilm. Extracellular substances were extracted with NaOH/formaldehyde and the structures of two excreted polymers studied by methylation as well as NMR analyses. The main polysaccharide (~ 80%) was pullulan, also known as α-1,4-; α-1,6-glucan, with different degrees of polymerisation...
December 23, 2017: Extremophiles: Life Under Extreme Conditions
https://www.readbyqxmd.com/read/29229530/trichoderma-harzianum-mtcc-5179-impacts-the-population-and-functional-dynamics-of-microbial-community-in-the-rhizosphere-of-black-pepper-piper-nigrum-l
#3
Palaniyandi Umadevi, Muthuswamy Anandaraj, Vivek Srivastav, Sailas Benjamin
Employing Illumina Hiseq whole genome metagenome sequencing approach, we studied the impact of Trichoderma harzianum on altering the microbial community and its functional dynamics in the rhizhosphere soil of black pepper (Piper nigrum L.). The metagenomic datasets from the rhizosphere with (treatment) and without (control) T. harzianum inoculation were annotated using dual approach, i.e., stand alone and MG-RAST. The probiotic application of T. harzianum in the rhizhosphere soil of black pepper impacted the population dynamics of rhizosphere bacteria, archae, eukaryote as reflected through the selective recruitment of bacteria [Acidobacteriaceae bacterium (p=1...
November 29, 2017: Brazilian Journal of Microbiology: [publication of the Brazilian Society for Microbiology]
https://www.readbyqxmd.com/read/29193858/exophiala-phaeomuriformis-keratitis-in-a-subarctic-climate-region-a-case-report
#4
André Vicente, Fátima Pedrosa Domellöf, Berit Byström
PURPOSE: To report a case of Exophiala phaeomuriformis mycotic keratitis in a patient from a subarctic climate region. Dematiaceous fungi (black yeasts) have been gaining importance as corneal keratitis and ulcer causative agents in certain regions, but no cases have been described in Scandinavia. METHODS: Case report of a patient with a persistent corneal erosion that eventually presented a brown-pigmented infiltrate. The patient had a history of several months of topical therapy comprising medication for glaucoma, corticosteroids and antibiotics...
November 29, 2017: Acta Ophthalmologica
https://www.readbyqxmd.com/read/29186370/comparative-genomics-of-pathogenic-and-non-pathogenic-beetle-vectored-fungi-in-the-genus-geosmithia
#5
Taruna A Schuelke, Guangxi Wu, Anthony Westbrook, Keith Woeste, David C Plachetzki, Kirk Broders, Matthew D MacManes
Geosmithia morbida is an emerging fungal pathogen which serves as a model for examining the evolutionary processes behind pathogenicity because it is one of two known pathogens within a genus of mostly saprophytic, beetle-associated, fungi. This pathogen causes thousand cankers disease in black walnut trees and is vectored into the host via the walnut twig beetle. G. morbida was first detected in western US and currently threatens the timber industry concentrated in eastern US. We sequenced the genomes of G...
November 23, 2017: Genome Biology and Evolution
https://www.readbyqxmd.com/read/29151624/biodiversity-and-human-pathogenicity-of-phialophora-verrucosa-and-relatives-in-chaetothyriales
#6
Y Li, J Xiao, G S de Hoog, X Wang, Z Wan, J Yu, W Liu, R Li
Phialophora as defined by its type species P. verrucosa is a genus of Chaetothyriales, and a member of the group known as 'black yeasts and relatives'. Phialophora verrucosa has been reported from mutilating human infections such as chromoblastomycosis, disseminated phaeohyphomycosis and mycetoma, while morphologically similar fungi are rather commonly isolated from the environment. Phenotypes are insufficient for correct species identification, and molecular data have revealed significant genetic variation within the complex of species currently identified as P...
June 2017: Persoonia
https://www.readbyqxmd.com/read/29151097/the-dancing-manias-psychogenic-illness-as-a-social-phenomenon
#7
Douglas J Lanska
The dancing mania erupted in the 14th century in the wake of the Black Death, and recurred for centuries in central Europe - particularly Germany, the Netherlands, and Belgium - finally abating in the early 17th century. The term "dancing mania" was derived from "choreomania," a concatenation of choros (dance) and mania (madness). A variant, tarantism, was prevalent in southern Italy from the 15th to the 17th centuries, and was attributed at the time to bites from the tarantula spider. Affected individuals participated in continuous, prolonged, erratic, often frenzied and sometimes erotic, dancing...
2018: Frontiers of Neurology and Neuroscience
https://www.readbyqxmd.com/read/29102684/overview-of-selected-virulence-attributes-in-aspergillus-fumigatus-candida-albicans-cryptococcus-neoformans-trichophyton-rubrum-and-exophiala-dermatitidis
#8
REVIEW
Hazal Boral, Banu Metin, Aylin Döğen, Seyedmojtaba Seyedmousavi, Macit Ilkit
The incidence of fungal diseases has been increasing since 1980, and is associated with excessive morbidity and mortality, particularly among immunosuppressed patients. Of the known 625 pathogenic fungal species, infections caused by the genera Aspergillus, Candida, Cryptococcus, and Trichophyton are responsible for more than 300 million estimated episodes of acute or chronic infections worldwide. In addition, a rather neglected group of opportunistic fungi known as black yeasts and their filamentous relatives cause a wide variety of recalcitrant infections in both immunocompetent and immunosuppressed hosts...
November 1, 2017: Fungal Genetics and Biology: FG & B
https://www.readbyqxmd.com/read/29102309/challenges-in-culture-negative-cases-of-madurella-mycetomatis-a-case-report-re-accentuating-pcr-as-an-essential-diagnostic-tool
#9
S K, S Das, D Pandhi, G Rai, M A Ansari, C Gupta, S Haque, S A Dar
Identification of dematiaceous fungi responsible for black-grain mycetoma has remained cumbersome and time consuming for years leading to delayed diagnosis and thereby increased agony to patients. Moreover, difficult morphology of some of these fungi demanding enough expertise for species identification in addition to culture-negativity has often led to misdiagnosis and hence inapt treatment to the patients. We report the identification of Madurella mycetomatis from culture-negative black granules discharged from foot nodular lesions of a 27 years old male using PCR followed by sequencing of the internal transcribed spacer region...
October 25, 2017: Journal de Mycologie Médicale
https://www.readbyqxmd.com/read/29097475/draft-genome-sequences-of-the-black-rock-fungus-knufia-petricola-and-its-spontaneous-nonmelanized-mutant
#10
Donatella Tesei, Hakim Tafer, Caroline Poyntner, Guadalupe Piñar, Ksenija Lopandic, Katja Sterflinger
The fungal genus Knufia mostly comprises extremotolerant species from environmental sources, especially rock surfaces. The draft genome sequence of the rock fungus Knufia petricola presented here is the first whole-genome sequence of the only species among black fungi known to have a nonmelanized spontaneous mutant.
November 2, 2017: Genome Announcements
https://www.readbyqxmd.com/read/29067036/arbuscular-mycorrhizal-symbiosis-alleviates-salt-stress-in-black-locust-through-improved-photosynthesis-water-status-and-k-na-homeostasis
#11
Jie Chen, Haoqiang Zhang, Xinlu Zhang, Ming Tang
Soil salinization and the associated land degradation are major and growing ecological problems. Excess salt in soil impedes plant photosynthetic processes and root uptake of water and nutrients such as K(+). Arbuscular mycorrhizal (AM) fungi can mitigate salt stress in host plants. Although, numerous studies demonstrate that photosynthesis and water status are improved by mycorrhizae, the molecular mechanisms involved have received little research attention. In the present study, we analyzed the effects of AM symbiosis and salt stress on photosynthesis, water status, concentrations of Na(+) and K(+), and the expression of several genes associated with photosynthesis (RppsbA, RppsbD, RprbcL, and RprbcS) and genes coding for aquaporins or membrane transport proteins involved in K(+) and/or Na(+) uptake, translocation, or compartmentalization homeostasis (RpSOS1, RpHKT1, RpNHX1, and RpSKOR) in black locust...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/29062304/comparative-genomics-of-sibling-species-of-fonsecaea-associated-with-human-chromoblastomycosis
#12
Vania A Vicente, Vinícius A Weiss, Amanda Bombassaro, Leandro F Moreno, Flávia F Costa, Roberto T Raittz, Aniele C Leão, Renata R Gomes, Anamelia L Bocca, Gheniffer Fornari, Raffael J A de Castro, Jiufeng Sun, Helisson Faoro, Michelle Z Tadra-Sfeir, Valter Baura, Eduardo Balsanelli, Sandro R Almeida, Suelen S Dos Santos, Marcus de Melo Teixeira, Maria S Soares Felipe, Mariana Machado Fidelis do Nascimento, Fabio O Pedrosa, Maria B Steffens, Derlene Attili-Angelis, Mohammad J Najafzadeh, Flávio Queiroz-Telles, Emanuel M Souza, Sybren De Hoog
Fonsecaea and Cladophialophora are genera of black yeast-like fungi harboring agents of a mutilating implantation disease in humans, along with strictly environmental species. The current hypothesis suggests that those species reside in somewhat adverse microhabitats, and pathogenic siblings share virulence factors enabling survival in mammal tissue after coincidental inoculation driven by pathogenic adaptation. A comparative genomic analysis of environmental and pathogenic siblings of Fonsecaea and Cladophialophora was undertaken, including de novo assembly of F...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/29044220/structure-of-melanins-from-the-fungi-ochroconis-lascauxensis-and-ochroconis-anomala-contaminating-rock-art-in-the-lascaux-cave
#13
José Maria De la Rosa, Pedro M Martin-Sanchez, Santiago Sanchez-Cortes, Bernardo Hermosin, Heike Knicker, Cesareo Saiz-Jimenez
Two novel species of the fungal genus Ochroconis, O. lascauxensis and O. anomala have been isolated from the walls of the Lascaux Cave, France. The interest in these fungi and their melanins lies in the formation of black stains on the walls and rock art which threatens the integrity of the paintings. Here we report solid-state cross polarization magic-angle spinning (13)C and (15)N nuclear magnetic resonance (NMR) spectroscopy and surface-enhanced Raman spectroscopy (SERS) of the melanins extracted from the mycelia of O...
October 18, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28946118/comparative-study-of-eco-and-cytotoxicity-during-biotransformation-of-anthraquinone-dye-alizarin-blue-black-b-in-optimized-cultures-of-microscopic-fungi
#14
Kamila Rybczyńska-Tkaczyk, Agata Święciło, Konrad A Szychowski, Teresa Korniłłowicz-Kowalska
The aim of this study was to select optimal conditions (C and N sources, initial pH and temperature) for biodecolorization of 0.03% anthraquinone dye Alizarin Blue Black B (ABBB) by microscopic fungi: Haematonectria haematococca BwIII43, K37 and Trichoderma harzianum BsIII33. The phenolic compounds, phytotoxicity (Lepidium sativum L.), biotoxicity (Microtox), cytotoxicity and yeast viability assay were performed to determine the extent of ABBB detoxification. Biodecolorization and detoxification of 0.03% ABBB in H...
January 2018: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/28900256/genomic-and-transcriptomic-analysis-of-the-toluene-degrading-black-yeast-cladophialophora-immunda
#15
Barbara Blasi, Hakim Tafer, Christina Kustor, Caroline Poyntner, Ksenija Lopandic, Katja Sterflinger
Cladophialophora immunda is an ascomycotal species belonging to the group of the black yeasts. These fungi have a thick and melanized cell wall and other physiological adaptations that allows them to cope with several extreme physical and chemical conditions. Member of the group can colonize some of the most extremophilic environments on Earth. Cladophialophora immunda together with a few other species of the order Chaetothyriales show a special association with hydrocarbon polluted environments. The finding that the fungus is able to completely mineralize toluene makes it an interesting candidate for bioremediation purposes...
September 12, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28840358/ectomycorrhizal-fungi-reduce-the-light-compensation-point-and-promote-carbon-fixation-of-pinus-thunbergii-seedlings-to-adapt-to-shade-environments
#16
Liang Shi, Jie Wang, Binhao Liu, Kazuhide Nara, Chunlan Lian, Zhenguo Shen, Yan Xia, Yahua Chen
We examined the effects of three ectomycorrhizal (ECM) symbionts on the growth and photosynthesis capacity of Japanese black pine (Pinus thunbergii) seedlings and estimated physiological and photosynthetic parameters such as the light compensation point (LCP), biomass, and phosphorus (Pi) concentration of P. thunbergii seedlings. Through this investigation, we documented a new role of ectomycorrhizal (ECM) fungi: enhancement of the survival and competitiveness of P. thunbergii seedlings under low-light condition by reducing the LCP of seedlings...
November 2017: Mycorrhiza
https://www.readbyqxmd.com/read/28813732/gastric-zygomycosis-in-a-previously-healthy-56-year-old-male
#17
Ashwyna Sunassee, Desirae M Muirhead
Zygomycosis refers to invasive fungal infections caused by fungi belonging to the phylum zygomycota. Infections generally occur in immunocompromised individuals. The following case is of a previously healthy 56 year-oldmale admitted to the hospital following a motor vehicle accident. During his hospitalization, there was a significant drop in hemoglobin with no obvious source of bleeding. This prompted the clinician to insert a nasogastric tube which returned at least 2 liters of black fluid and led to an upper gastrointestinal endoscopy...
April 2017: South Dakota Medicine: the Journal of the South Dakota State Medical Association
https://www.readbyqxmd.com/read/28794466/a-family-of-archaea-like-carboxylesterases-preferentially-expressed-in-the-symbiotic-phase-of-the-mychorrizal-fungus-tuber-melanosporum
#18
Davide Cavazzini, Guido Grossi, Elisabetta Levati, Francesca Vallese, Barbara Montanini, Angelo Bolchi, Giuseppe Zanotti, Simone Ottonello
An increasing number of esterases is being revealed by (meta) genomic sequencing projects, but few of them are functionally/structurally characterized, especially enzymes of fungal origin. Starting from a three-member gene family of secreted putative "lipases/esterases" preferentially expressed in the symbiotic phase of the mycorrhizal fungus Tuber melanosporum ("black truffle"), we show here that these enzymes (TmelEST1-3) are dimeric, heat-resistant carboxylesterases capable of hydrolyzing various short/medium chain p-nitrophenyl esters...
August 9, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28771577/a-survey-of-the-mycobiota-associated-with-larvae-of-the-black-soldier-fly-hermetia-illucens-reared-for-feed-production
#19
Ilaria Varotto Boccazzi, Matteo Ottoboni, Elena Martin, Francesco Comandatore, Lisa Vallone, Thomas Spranghers, Mia Eeckhout, Valeria Mereghetti, Luciano Pinotti, Sara Epis
Feed security, feed quality and issues surrounding the safety of raw materials are always of interest to all livestock farmers, feed manufacturers and competent authorities. These concerns are even more important when alternative feed ingredients, new product developments and innovative feeding trends, like insect-meals, are considered. The black soldier fly (Hermetia illucens) is considered a good candidate to be used as feed ingredient for aquaculture and other farm animals, mainly as an alternative protein source...
2017: PloS One
https://www.readbyqxmd.com/read/28723243/pathogenicity-of-nectriaceous-fungi-on-avocado-in-australia
#20
Louisamarie E Parkinson, Roger G Shivas, Elizabeth K Dann
Black root rot is a severe disease of young avocado trees in Australia causing black necrotic roots, tree stunting, and leaf drop prior to tree death. Nectriaceous fungi (Nectriaceae, Hypocreales), are commonly isolated from symptomatic roots. This research tested the pathogenicity of 19 isolates from Calonectria, Cylindrocladiella, Dactylonectria, Gliocladiopsis, and Ilyonectria, spp. collected from young avocado trees and other hosts. Glasshouse pathogenicity tests with 'Reed' avocado (Persea americana) seedlings confirmed that Calonectria ilicicola is a severe pathogen of avocado, causing stunting, wilting, and seedling death within 5 weeks of inoculation...
December 2017: Phytopathology
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