Colletotrichum Gloesporioides Inhibition In Situ by Chitosan-Ruta graveolens Essential Oil Coatings: Effect on Microbiological, Physicochemical, and Organoleptic Properties of Guava (Psidium guajava L.) during Room Temperature Storage

Guava is a fruit appreciated worldwide for its high content of bioactive compounds. However, it is considered a highly perishable fruit, generally attacked by pathogenic species such as the fungi Colletotrichum gloeosporioides, which causes anthracnosis. To diminish the losses caused by pathogenic fungi, coatings of chitosan (CS) with Ruta graveolens essential oil (RGEO) in different concentrations (0.5, 1.0, 1.5% v/v) were applied in situ and their effects on the physical properties and microbiological quality of the guavas were studied. The CS+RGEO coated fruits exhibited better physicochemical behavior and lower microbiological decay as compared to the uncoated guavas, demonstrating the effectiveness of the coatings, especially those with 1.5% of RGEO content. All the fruits coated had greater acceptance and quality than the controls, being more those with essential oil incorporation. In situ investigation of C. gloesporioides infection of guavas demonstrated that the CS+RGEO coated guavas showed a high percentage of inhibition in the development of anthracnose lesions. In the present investigation, an alternative method has been proposed to extend the stability of the guavas fruit up to 12 days with application in the food industry.

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Application of Furcellaran Nanocomposite Film as Packaging of Cheese

Polymers ◽

10.3390/polym13091428 ◽

2021 ◽

Vol 13 (9) ◽

pp. 1428

Author(s):

Agnieszka Pluta-Kubica ◽

Ewelina Jamróz ◽

Gohar Khachatryan ◽

Adam Florkiewicz ◽

Pavel Kopel

Keyword(s):

Silver Nanoparticles ◽

Nanocomposite Film ◽

Microbiological Quality ◽

Inhibitory Effect ◽

Quality Properties ◽

In Situ Method ◽

And Migration ◽

Total Bacteria

There is a serious need to develop and test new biodegradable packaging which could at least partially replace petroleum-based materials. Therefore, the objective of this work was to examine the influence of the recently developed furcellaran nanocomposite film with silver nanoparticles (obtained by an in situ method) on the quality properties of two cheese varieties: a rennet-curd (gouda) and an acid-curd (quark) cheese. The water content, physicochemical properties, microbiological and organoleptic quality of cheese, and migration of silver nanoparticles were examined. Both the number of Lactococcus and total bacteria count did not differ during storage of gouda regardless of the packaging applied. The number of Lactococcus decreased in analogous quark samples. The use of the film slowed down and inhibited the growth of yeast in gouda and quark, respectively. An inhibitory effect of this film on mold count was also observed; however, only regarding gouda. The level of silver migration was found to be lower in quark than in gouda. The film improved the microbiological quality of cheeses during storage. Consequently, it is worth continuing research for the improvement of this film in order to enable its use in everyday life.

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High temperature structural study of decagonal Al-Cu-Rh quasicrystal.

Acta Crystallographica Section A Foundations and Advances ◽

10.1107/s2053273314099057 ◽

2014 ◽

Vol 70 (a1) ◽

pp. C94-C94

Author(s):

Pawel Kuczera ◽

Walter Steurer

Keyword(s):

Structural Changes ◽

Configurational Entropy ◽

Lattice Vibrations ◽

X Ray Diffraction ◽

Stabilization Mechanism ◽

X Ray ◽

Comparative Structure ◽

The Stability

The structure of d(ecagonal)-Al-Cu-Rh has been studied as a function of temperature by in-situ single-crystal X-ray diffraction in order to contribute to the discussion on energy or entropy stabilization of quasicrystals (QC) [1]. The experiments were performed at 293 K, 1223 K, 1153 K, 1083 K, and 1013 K. A common subset of 1460 unique reflections was used for the comparative structure refinements at each temperature. The results obtained for the HT structure refinements of d-Al-Cu-Rh QC seem to contradict a pure phasonic-entropy-based stabilization mechanism [2] for this QC. The trends observed for the ln func(I(T1 )/I(T2 )) vs.|k⊥ |^2 plots indicate that the best on-average quasiperiodic order exists between 1083 K and 1153 K, however, what that actually means is unclear. It could indicate towards a small phasonic contribution to entropy, but such contribution is not seen in the structure refinements. A rough estimation of the hypothetic phason instability temperature shows that it would be kinetically inaccessible and thus the phase transition to a 12 Å low T structure (at ~800 K) is most likely not phason-driven. Except for the obvious increase in the amplitude of the thermal motion, no other significant structural changes, in particular no sources of additional phason-related configurational entropy, were found. All structures are refined to very similar R-values, which proves that the quality of the refinement at each temperature is the same. This suggests, that concerning the stability factors, some QCs could be similar to other HT complex intermetallic phases. The experimental results clearly show that at least the ~4 Å structure of d-Al-Cu-Rh is a HT phase therefore entropy plays an important role in its stabilisation mechanism lowering the free energy. However, the main source of this entropy is probably not related to phason flips, but rather to lattice vibrations, occupational disorder unrelated to phason flips like split positions along the periodic axis.

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The ESA Permanent Facility for Altimetry Calibration: Monitoring Performance of Radar Altimeters for Sentinel-3A, Sentinel-3B and Jason-3 Using Transponder and Sea-Surface Calibrations with FRM Standards

Remote Sensing ◽

10.3390/rs12162642 ◽

2020 ◽

Vol 12 (16) ◽

pp. 2642

Author(s):

Stelios Mertikas ◽

Achilleas Tripolitsiotis ◽

Craig Donlon ◽

Constantin Mavrocordatos ◽

Pierre Féménias ◽

...

Keyword(s):

Objective Assessment ◽

Ground Truth ◽

Sea Surface ◽

Crossover Analysis ◽

Operational Phase ◽

The Stability ◽

Independent Calibration ◽

Monitoring Performance

This work presents the latest calibration results for the Copernicus Sentinel-3A and -3B and the Jason-3 radar altimeters as determined by the Permanent Facility for Altimetry Calibration (PFAC) in west Crete, Greece. Radar altimeters are used to provide operational measurements for sea surface height, significant wave height and wind speed over oceans. To maintain Fiducial Reference Measurement (FRM) status, the stability and quality of altimetry products need to be continuously monitored throughout the operational phase of each altimeter. External and independent calibration and validation facilities provide an objective assessment of the altimeter’s performance by comparing satellite observations with ground-truth and in-situ measurements and infrastructures. Three independent methods are employed in the PFAC: Range calibration using a transponder, sea-surface calibration relying upon sea-surface Cal/Val sites, and crossover analysis. Procedures to determine FRM uncertainties for Cal/Val results have been demonstrated for each calibration. Biases for Sentinel-3A Passes No. 14, 278 and 335, Sentinel-3B Passes No. 14, 71 and 335, as well as for Jason-3 Passes No. 18 and No. 109 are given. Diverse calibration results by various techniques, infrastructure and settings are presented. Finally, upgrades to the PFAC in support of the Copernicus Sentinel-6 ‘Michael Freilich’, due to launch in November 2020, are summarized.

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In situ investigation of the stability field and relaxation behavior of nanodomain structures in morphotropic Pb[Zr1−xTix]O3 under variations in electric field and temperature

Applied Physics Letters ◽

10.1063/1.3098073 ◽

2009 ◽

Vol 94 (12) ◽

pp. 122902 ◽

Cited By ~ 8

Author(s):

Kristin A. Schönau ◽

Michael Knapp ◽

Mario Maglione ◽

Hartmut Fuess

Keyword(s):

Electric Field ◽

Relaxation Behavior ◽

Stability Field ◽

In Situ Investigation ◽

The Stability

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Microbiological Quality of Chicken’s Thigh After Vacuum Packaging and Fir Essential Oil Treatment

Modern Concepts & Developments in Agronomy ◽

10.31031/mcda.2019.04.000577 ◽

2019 ◽

Vol 4 (1) ◽

Author(s):

Kačániová M

Keyword(s):

Essential Oil ◽

Microbiological Quality ◽

Vacuum Packaging

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IN VIVO EFFECT OF Origanum vulgare ESSENTIAL OIL ON MICROBIOLOGICAL QUALITY OF RAW MILK FROM SUBCLINICAL MASTITIS AFFECTED COWS

The Journal Agriculture and Forestry ◽

10.17707/agricultforest.67.2.07 ◽

2021 ◽

Vol 67 (2) ◽

Author(s):

Mohamed Walid HAMLAOUI ◽

Ahmed HADEF ◽

Fawzi Rostane MEKLATI ◽

Meriem ALLEG ◽

Bouchra GHOUILA

Keyword(s):

Essential Oil ◽

Microbiological Quality ◽

Raw Milk ◽

Subclinical Mastitis ◽

Origanum Vulgare

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STUDY OF PHYSICOCHEMICAL AND MICROBIOLOGICAL QUALITY OF THE SPRING WATERS OF THE REGION OF OUM TEBOUL WILAYA OF EL TARF- ALGERIA

Journal of Engineering Studies and Research ◽

10.29081/jesr.v26i3.206 ◽

2020 ◽

Vol 26 (3) ◽

pp. 52-57

Author(s):

SABRINA BOUCHELAGHEM ◽

SAMIA MOUISSI ◽

CHAIMA BENZERAA ◽

ROUMAISSA KHALFOUN

Keyword(s):

Drinking Water ◽

Microbiological Quality ◽

Point Of View ◽

Fecal Coliforms ◽

Total Coliforms ◽

Drinking Water Standards ◽

Physico Chemical ◽

Microbiological Parameters

The present work aims to assess the physico-chemical and microbiological parameters of the waters of the three sources (Ain Bergougaya, Ain Sigleb and Siporex) in the region of Oum el Teboul wilaya of El Tarf. Parameters such as temperature, pH, conductivity and salinity were measured in situ with a field multimeter. Hardness (62 mg/L to 266 mg/L), salinity (0.01 to 1 mg/L). From a microbiological point of view, there has been no evidence of the complete absence of germs of contamination such as total coliforms and fecal coliforms. This study compared to the drinking water standards shows that the waters in the area studied are of good quality.

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