Effects of initial microbial density on disinfection efficiency and explanatory mechanisms

2021 ◽  
Author(s):  
Baris Kaymak
Keyword(s):  
Microbial Density

Effect of initial microbial density on inactivation of Giardia muris by ozone

2003 ◽  
Vol 37 (12) ◽  
pp. 2980-2988 ◽  
Author(s):  
Charles N. Haas ◽  
Baris Kaymak
Keyword(s):  
Microbial Density ◽  
Giardia Muris

scholarly journals Susceptibility of earth-based construction materials to fungal proliferation: laboratory and in situ assessment

2019 ◽  
Vol 3 ◽  
pp. 140-149 ◽  
Author(s):  
Alexis Simons ◽  
Alexandra Bertron ◽  
Christophe Roux ◽  
Aurélie Laborel-Préneron ◽  
Jean-Emmanuel Aubert ◽  
...  
Keyword(s):  
Air Quality ◽  
Manufacturing Process ◽  
Building Materials ◽  
Construction Materials ◽  
Microbial Density ◽  
Microbial Proliferation ◽  
Materials Used ◽  
Ecological Construction ◽  
The Impact

The impact of building materials on the environment and the health of occupants is nowadays a priority issue. Ecological construction materials such as earthen materials are currently experiencing a regain of interest due to both ecological and economic factors. The microbial proliferation on indoor materials can induce a deterioration of the building air quality and lead to an increase of health risks for the occupants. The issue of indoor air quality raises questions about the use of earthen building materials and their possible susceptibility to fungal development. The microflora of earthen materials and their ability to grow on such support are indeed poorly studied. This study focused on the quantification of both bacterial and fungal microflora along the manufacturing process. The impact of extreme humidity, simulating a hydric accident, on microflora development was analyzed on the surface and inside earthen bricks. The initial microflora of these materials was dramatically reduced during the manufacturing process, especially after heat treatment for drying. Proliferation of remaining microorganisms was only observed under high humidity condition, in particular for earthen materials with vegetal aggregates. Moreover, in situ samplings were performed on naturally dried earthen materials used in buildings. The characterization of the microbial density revealed a higher microbial density than on manufactured specimens, while microbial concentration and detected taxa seemed mainly related to the room use and building history. These results provide a better understanding of microbial proliferation on these materials.

scholarly journals Nutrition features of young children with oncological diseases in the process of antitumor treatment

2019 ◽  
pp. 200-204
Author(s):  
A. Yu. Vashura ◽  
Ju. A. Alymova
Keyword(s):  
Nutritional Support ◽  
Gastrointestinal Disorders ◽  
Early Age ◽  
Antitumor Therapy ◽  
Gastrointestinal Complications ◽  
Existing Problems ◽  
Microbial Density ◽  
Oncological Diseases ◽  
Long Time ◽  
Special Approach

Carrying out antitumor treatment of children with oncological diseases is often accompanied by many complications, one of the most significant eating disorders. These disorders can aggravate the existing problems, complicate the patient’s treatment and often dictate the need for special nutritional support. First of all, it is based on the limitations associated with the requirements for low microbial density of food (due to sharply reduced immunity), gastrointestinal disorders of varying severity and prevalence, peculiarities of taste and appetite of the child (which are almost always violated in the process of antitumor therapy), as well as psychological problems. In children of early age, this situation is very significant, since complications (especially gastrointestinal complications) can last for a long time, which may limit the development of the child, even if the basic treatment is successfully completed, or even prevent him or her from developing at all. Therefore, such patients need special nutritional support: enteral and often parenteral nutrition, as well as a special approach to diet, which is often based on industrial baby food products.

scholarly journals Influence of Different Amendments on the Dynamics of Nitrogen Fixing Bacteria Free in Chernozem Soil of Dobrogea

2011 ◽  
Vol 68 (1) ◽  
Author(s):  
Elena DELCĂ ◽  
Tatiana PASCU
Keyword(s):  
Preliminary Data ◽  
Organic Amendments ◽  
Chernozem Soil ◽  
Nitrogen Fixing ◽  
Nitrogen Fixing Bacteria ◽  
Abundance Dynamics ◽  
Microbial Density ◽  
Density Values ◽  
Dry Soil ◽  
Positive Effect

The paper presents preliminary data on the abundance dynamics of nitrogen fixing bacteria-free cultivation, the effect of administration of anorganic organic amendments were. Based on 7 experimental variants of cultivation was found that the total number of nitrogen fixing bacteria-free cultivation (cyanobacteria and Azotobacter species) ranged between: 39.58x105CFU/g soil in October (V6) and 326.78x105CFU/g soil in May (V3). When soil was supplemented with manure microbial density showed a significant increase 326.78x105CFU/g dry soil compared with control variant 74.17x105CFU/g soil. Inorganic fertilizers did not have a positive effect on microbial density values, being more or less similar to those reported for the control. Bacterial density increased significantly as value, too, following the administration of specific biofertilizers (Biovin, Bactofil Professional; Mycos Green), up to (V6) 319.81x105CFU/g dry soil in May.

Relationship between subsurface biodegradation rates and microbial density

1989 ◽  
Vol 23 (5) ◽  
pp. 525-532 ◽  
Author(s):  
Gary T. Hickman ◽  
John T. Novak
Keyword(s):  
Microbial Density

scholarly journals Microbiota imprint gut–intrinsic neuronal programming and sympathetic activity

2019 ◽  
Author(s):  
Paul A Muller ◽  
Zachary Kerner ◽  
Marc Schneeberger ◽  
Daniel Mucida
Keyword(s):  
Sympathetic Activity ◽  
Sympathetic Neurons ◽  
Intestinal Wall ◽  
Dependent Manner ◽  
Neuronal Tracing ◽  
Commensal Microbiota ◽  
Microbial Density ◽  
Intestinal Functions ◽  
And Function ◽  
And Control

Microbial density and diversity increases from proximal to distal regions of the intestine, affecting tissue physiology, metabolism, and function of the immune and nervous systems. Both intrinsic and extrinsic enteric–associated neurons (EAN) continuously monitor and modulate homeostatic intestinal functions, including nutrient absorption and motility. However, a systemic and circuit-based link between gut microbes and the nervous system has yet to be established. Through a combination of molecular, anatomic and functional approaches, we characterized the influence of the microbiota on EAN. We found that intrinsic EAN are functionally adapted to the specific intestinal region they occupy in a microbiota-dependent manner. Furthermore, we observed that gut–extrinsic sympathetic neurons are hyperactivated in the absence of microbes, while the production of butyrate is sufficient to suppress sympathetic activity. Finally, retrograde polysynaptic neuronal tracing from the intestinal wall revealed that brainstem GABAergic neurons are a potential central hub for modulation of gut–specific sympathetic neurons. These results reveal that commensal microbiota imprint gut–intrinsic neuronal gene programs and control extrinsic sympathetic activity through a metabolite–mediated gut-brain circuit.

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