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51.
Carolyn A. Haskard Hani S. El-Nezami Pasi E. Kankaanp Seppo Salminen Jorma T. Ahokas 《Applied microbiology》2001,67(7):3086-3091
Specific lactic acid bacterial strains remove toxins from liquid media by physical binding. The stability of the aflatoxin B1 complexes formed with 12 bacterial strains in both viable and nonviable (heat- or acid-treated) forms was assessed by repetitive aqueous extraction. By the fifth extraction, up to 71% of the total aflatoxin B1 remained bound. Nonviable bacteria retained the highest amount of aflatoxin B1. Lactobacillus rhamnosus strain GG (ATCC 53103) and L. rhamnosus strain LC-705 (DSM 7061) removed aflatoxin B1 from solution most efficiently and were selected for further study. The accessibility of bound aflatoxin B1 to an antibody in an indirect competitive inhibition enzyme-linked immunosorbent assay suggests that surface components of these bacteria are involved in binding. Further evidence is the recovery of around 90% of the bound aflatoxin from the bacteria by solvent extraction. Autoclaving and sonication did not release any detectable aflatoxin B1. Variation in temperature (4 to 37°C) and pH (2 to 10) did not have any significant effect on the amount of aflatoxin B1 released. Binding of aflatoxin B1 appears to be predominantly extracellular for viable and heat-treated bacteria. Acid treatment may permit intracellular binding. In all cases, binding is of a reversible nature, but the stability of the complexes formed depends on strain, treatment, and environmental conditions. 相似文献
52.
New avenues are reviewed and discussed for preventing industrial machine-related injury by means of realistic risk evaluation and reduction processes at the design and application stages of machinery development and use. U.S. guidelines and European standards on machinery risk assessment procedures are described. Applications of risk assessment for machine-related injury risk management and teaching machine-risk control are discussed. 相似文献
53.
Azemi Nur Farah Hani Misnan Rosmilah Keong Bun Poh Mokhtar Marina Kamaruddin Nurhaida Fah Wong Chee Yadzir Zailatul Hani Mohamad Yadzir Hani Mohamad Bakhtiar Faizal Abdullah Noormalin Arip Masita Ateshan Haidr Msahir 《Molecular biology reports》2021,48(10):6709-6718
Molecular Biology Reports - Tropomyosin is a major allergen in crustaceans, including mud crab species, but its molecular and allergenic properties in Scylla olivacea are not well known. Thus, this... 相似文献
54.
Mounira Ben Farhat Ameny Farhat Wacim Bejar Radhouan Kammoun Kameleddine Bouchaala Amin Fourati Hani Antoun Samir Bejar Hichem Chouayekh 《Archives of microbiology》2009,191(11):815-824
The mineral phosphate solubilizing (MPS) ability of a Serratia marcescens strain, namely CTM 50650, isolated from the phosphate mine of Gafsa, was characterized on a chemically defined medium (NBRIP
broth). Various insoluble inorganic phosphates, including rock phosphate (RP), calcium phosphate (CaHPO4), tri-calcium phosphate (Ca3(PO4)2) and hydroxyapatite were tested as sole sources of phosphate for bacterial growth. Solubilization of these phosphates by
S. marcescens CTM 50650 was very efficient. Indeed, under optimal conditions, the soluble phosphorus (P) concentration it produced reached
967, 500, 595 and 326 mg/l from CaHPO4, Ca3(PO4)2, hydroxyapatite and RP, respectively. Study of the mechanisms involved in the MPS activity of CTM 50650, showed that phosphate
solubilization was concomitant with significant drop in pH. HPLC-analysis of culture supernatants revealed the secretion of
gluconic acid (GA) resulting from direct oxidation pathway of glucose when the CTM 50650 cells were grown on NBRIP containing
glucose as unique carbon source. This was correlated with the simultaneous detection by PCR for the first time in a S. marcescens strain producing GA, of a gene encoding glucose dehydrogenase responsible for GA production, as well as the genes pqqA, B, C and E involved in biosynthesis of its PQQ cofactor. This study is expected to lead to the development of an environmental-friendly
process for fertilizer production considering the capacity of S. marcescens CTM 50650 to achieve yields of P extraction up to 75% from the Gafsa RP. 相似文献
55.
56.
Ashley E. Cole Fatmah M. Hani Brian W. Allen Paul C. Kline Elliot Altman 《The protein journal》2018,37(5):407-427
The isolation and characterization of 42 unique nonfunctional missense mutants in the bacterial cytosolic β-galactosidase and catechol 2,3-dioxygenase enzymes allowed us to examine some of the basic general trends regarding protein structure and function. A total of 6 out of the 42, or 14.29% of the missense mutants were in α-helices, 17 out of the 42, or 40.48%, of the missense mutants were in β-sheets and 19 out of the 42, or 45.24% of the missense mutants were in unstructured coil, turn or loop regions. While α-helices and β-sheets are undeniably important in protein structure, our results clearly indicate that the unstructured regions are just as important. A total of 21 out of the 42, or 50.00% of the missense mutants caused either amino acids located on the surface of the protein to shift from hydrophilic to hydrophobic or buried amino acids to shift from hydrophobic to hydrophilic and resulted in drastic changes in hydropathy that would not be preferable. There was generally good consensus amongst the widely used algorithms, Chou–Fasman, GOR, Qian–Sejnowski, JPred, PSIPRED, Porter and SPIDER, in their ability to predict the presence of the secondary structures that were affected by the missense mutants and most of the algorithms predicted that the majority of the 42 inactive missense mutants would impact the α-helical and β-sheet secondary structures or the unstructured coil, turn or loop regions that they altered. 相似文献
57.
Seasonal dynamics of agonistic behavior and hormones in an ex situ all‐male colony of large flying foxes 下载免费PDF全文
Hani D. Freeman Michelle Wood Mandi W. Schook Katherine A. Leighty Shana R. Lavin Susan Wiebe Tracy E. Blowers Rachel Daneault Natalie Mylniczenko Catharine J. Wheaton 《Zoo biology》2018,37(4):213-222
Large flying foxes (Pteropus vampyrus) are a socially complex species. In situ colonies typically comprise thousands of individuals in small harems of one male to many females. In ex situ environments, all‐male colonies are becoming more common due to a surplus of males in the population. There is limited information describing the hormonal and behavioral patterns of all‐male colonies during the breeding season. We assessed seasonal changes in hormones and behavior in an all‐male colony of 12 large flying foxes at Disney's Animal Kingdom®. We validated hormone assays using morning urine and fecal samples to assess seasonal changes in excreted immunoreactive testosterone and glucocorticoid metabolites. We collected behavior data using an all‐occurrence method, recording agonistic behaviors related to territorial defense (hooking, biting, wing flexing, vocalizing, and wrestling), and sexual behavior (mounting and frontal grabbing). Results indicated that (i) we could reliably measure testosterone and glucocorticoid metabolites concentrations from fecal and urine samples collected from individual bats; (ii) there were distinct relationships between changes in levels of agonism and hormone concentrations throughout the year; and (iii) three agonistic behaviors (chasing, wrestling, and open‐mouth threat) peaked prior to the increase in testosterone and glucocorticoid hormones measured during the breeding season. These three behaviors could potentially be used as early indicators to signal the onset of the breeding season and allow time to implement ex situ management changes to reduce the incidence of agonism between individuals. 相似文献
58.
Pythium oligandrum Drechsler bearing spherical sporangia with complex subglobose elements was isolated for the first time
in Egypt from agricultural field soil cultivated with alfalfa (Trifolium alexandrinum) in El-Minia, Egypt. This fungus was
found to be an active bio-control agent against P. ultimum var. ultimum, the damping-off organism of wheat. In agar plates,
P. oligandrum parasitized P. ultimum var. ultimum hyphae with the aid of thin haustorial branches or infection pegs, eventually
leading to host destruction. Incorporation of P. oligandrum into carboxymethylcellulose seed coating successfully eliminated
pre-emergence damping-off of wheat caused by P. ultimum var. ultimum, whereas Post-emergence damping-off was prevented by
adding inocula of P. oligandrum to the soil.
This revised version was published online in June 2006 with corrections to the Cover Date. 相似文献
59.
Binding Rather Than Metabolism May Explain the Interaction of Two Food-Grade Lactobacillus Strains with Zearalenone and Its Derivative ά-Zearalenol 下载免费PDF全文
Hani El-Nezami Nektaria Polychronaki Seppo Salminen Hannu Mykknen 《Applied microbiology》2002,68(7):3545-3549
The interaction between two Fusarium mycotoxins, zearalenone (ZEN) and its derivative ¯α-zearalenol (¯α-ZOL), with two food-grade strains of Lactobacillus was investigated. The mycotoxins (2 μg ml−1) were incubated with either Lactobacillus rhamnosus strain GG or L. rhamnosus strain LC705. A considerable proportion (38 to 46%) of both toxins was recovered from the bacterial pellet, and no degradation products of ZEN and ¯α-ZOL were detected in the high-performance liquid chromatograms of the supernatant of the culturing media and the methanol extract of the pellet. Both heat-treated and acid-treated bacteria were capable of removing the toxins, indicating that binding, not metabolism, is the mechanism by which the toxins are removed from the media. Binding of ZEN or ¯α-ZOL by lyophilized L. rhamnosus GG and L. rhamnosus LC705 was a rapid reaction: approximately 55% of the toxins were bound instantly after mixing with the bacteria. Binding was dependent on the bacterial concentration, and coincubation of ZEN with ¯α-ZOL significantly affected the percentage of the toxin bound, indicating that these toxins may share the same binding site on the bacterial surface. These results can be exploited in developing a new approach for detoxification of mycotoxins from foods and feeds. 相似文献
60.