The decay of airborne bacteria and fungi in a constant temperature and humidity test chamber

Because of the complexity of corrosion, the law of uniform corrosion and localized corrosion is still not clear,so it is difficult to assess their impact on the structure safety. In order to differ them and find their own law, we obtain a lot of corrosion specimens by ways of constant temperature and humidity, and then detect the size of corrosion pits by roughness tester. After that, the method for calculating the thickness of uniform corrosion and localized corrosion is proposed. Then the method is used to analyze the experiment data. The result indicates the thickness of uniform corrosion and localized corrosion all increase with the rate of corrosion, and they all show a power relationship with corrosion rate, so it will provide a basis for distinguishing them in safety assessment.

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Fuzzy PID Controller Design of Air Handling Unit for Constant Temperature and Humidity Air-Conditioning

2016 8th International Conference on Intelligent Human-Machine Systems and Cybernetics (IHMSC) ◽

10.1109/ihmsc.2016.219 ◽

2016 ◽

Author(s):

Liu Shuai ◽

Xiangdong Wang ◽

Shujiang Li

Keyword(s):

Constant Temperature ◽

Pid Controller ◽

Air Conditioning ◽

Controller Design ◽

Fuzzy Pid ◽

Fuzzy Pid Controller ◽

Air Handling Unit ◽

Temperature And Humidity ◽

Pid Controller Design

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Airborne Bacteria and Fungi Concentration in Relation with Bedding Type in Broiler Houses

Bulletin of University of Agricultural Sciences and Veterinary Medicine Cluj-Napoca Veterinary Medicine ◽

10.15835/buasvmcn-vm:2018.0033 ◽

2019 ◽

Vol 76 (2) ◽

pp. 222

Author(s):

Silvana POPESCU ◽

Cristin BORDA ◽

Cristina EL MAHDY ◽

Eva Andrea LAZAR ◽

Anamaria BLAGA PETREAN ◽

...

Keyword(s):

Sunflower Seed ◽

Microbial Contamination ◽

Production Cycle ◽

Airborne Bacteria ◽

Airborne Concentration ◽

Commercial Farms ◽

Bacteria And Fungi

The aim of this work was the investigation of the effect of bedding type on the airborne concentration of bacteria and fungi in broiler houses. The study was performed in two commercial farms (A and B) with different bedding (chopped straw in farm A, sunflower seed hulls in farm B). The determination of the bacteria and fungi’s numbers was performed in the first and the sixth weeks of the production cycle. Both the concentration of the bacteria and fungi showed higher values in the farm A compared with the farm B, especially in the latter period of the production cycle. In both farms, significant differences (P < 0.05) were recorded between the two periods of the determinations. The results of this study suggest that using sunflower seed hulls as bedding leads to lower levels of microbial contamination of the air in broiler houses, comparing with the use of chopped straw.

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Memoirs: The Early Embryonic Development of Rhodnius Prolixus (Hemiptera, Heteroptera)

Journal of Cell Science ◽

10.1242/jcs.s2-78.309.71 ◽

1935 ◽

Vol s2-78 (309) ◽

pp. 71-90

Author(s):

HELEN MELLANBY

Keyword(s):

Relative Humidity ◽

Embryonic Development ◽

Early Development ◽

Constant Temperature ◽

Germ Cells ◽

Rhodnius Prolixus ◽

Posterior Pole ◽

Early Embryonic Development ◽

Temperature And Humidity ◽

Cent Relative Humidity

1. Eggs of Rhodnius prolixus were incubated at constant temperature and humidity (21° C. and 90 per cent, relative humidity). Eighty-five per cent, was the lowest record of the controls hatched successfully under these conditions. 2. The processes of maturation and fertilization were not studied. 3. Cleavage begins 12-13 hours after incubation. At 25 hours there are 32 nuclei. Yolk-cells are derived from cleavage nuclei, and they multiply by mitosis up to 50 hours. Blastoderm formation is complete after 55-60 hours of incubation. 4. The ventral embryonic rudiment is similar to that of many other insects. As soon as it is formed, germ-cells are budded off at the posterior pole of the egg. 5. The first stage in blastokinesis is fully described. 6. The formation of the mesoderm is by invagination and overgrowth. 7. The endoderm arises from two proliferating areas situated anteriorly and posteriorly. 8. Numerous cells are given off into the yolk during the early development of the embryo. There they disintegrate.

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Detection and quantification of viable airborne bacteria and fungi using solid-phase cytometry

Nature Protocols ◽

10.1038/nprot.2008.228 ◽

2009 ◽

Vol 4 (2) ◽

pp. 224-231 ◽

Cited By ~ 10

Author(s):

Lies M E Vanhee ◽

Hans J Nelis ◽

Tom Coenye

Keyword(s):

Solid Phase ◽

Airborne Bacteria ◽

Bacteria And Fungi ◽

Detection And Quantification

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Influence of Humidity on Mortality and Rate of Development of Immature Stages of the Grain-Infesting Mite Tyrophagus castellanii (Hirst) (Acarina: Acaridae) Reared on Mould Cultures

The Canadian Entomologist ◽

10.4039/ent90721-12 ◽

1958 ◽

Vol 90 (12) ◽

pp. 721-724 ◽

Cited By ~ 5

Author(s):

I. Rivard

Keyword(s):

Direct Effect ◽

Constant Temperature ◽

Immature Stages ◽

Food Material ◽

Predator Prey ◽

Rate Of Development ◽

Fresh Food ◽

Temperature And Humidity

It was observed that populations of Tyrophagus castellanii (Hirst) reared on cereal flakes and yeast for studies of predator-prey interactions were feeding on moulds rather than on the food material, and that an increase in humidity increased their rates of development. To discover whether this was caused by the direct effect of humidity on the mites or by a greater supply of fresh food brought about by an increase in humidity, rearings were made with a technique developed by Rivard (1958). The mites were reared exclusively on mould cultures under controlled temperature and humidity conditions. It was also possible with this technique to regdate modd growth to some extent, so that a supply of fresh food was always available to the mites. This is a report on the influence of various humidities on mortality and rate of development of the immature stages of T. castellanii at a constant temperature.

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