COMMITTEE ON FETUS AND NEWBORN

PEDIATRICS ◽  
1966 ◽  
Vol 38 (1) ◽  
pp. 142-144
Author(s):  

THE Committee on Fetus and Newborn and consultants met in Chicago, Illinois, on October 23, 1965, to consider the problem of decontamination of fomites in neonatal units to reduce the incidence of nosocomial infections. It was agreed that there is insufficient evidence available to make authoritative recommendations for uniform procedures to deal with problems of decontamination of incubators, bassinets, respirators, and other equipment used in present day neonatal facilities. However, the participants suggested that certain statements could be made at this time which would serve to stimulate the interest of those concerned with the management of neonatal units and to emphasize the need to obtain objective information for a satisfactory solution to the problems posed. Agreement was reached on the following statements: 1. Emphasis must be placed on cleansing and housekeeping procedures. Chemical disinfection is not a substitute for mechanical scrubbing and removal of dirt or organic matter. Moreover, organic matter inactivates many chemical disinfectants. 2. Manufacturers of equipment used in the newborn nursery must be encouraged to design equipment which can be easily cleaned and disinfected. Adequate cleansing of occupied incubators poses an almost insurmountable problem; ingenious engineering solutions are badly needed. Component pants of intricate devices should be removable for easier cleaning. Teflon coating of surfaces would ease mechanical cleansing. Nebulizing equipment should use air which has passed through a bacterial filter, sterile water from freshly opened bottles, and a closed system for delivery of water to the nozzle. Nebulizers should be designed for easy disinfection, preferably sterilization.

Radiocarbon ◽  
1992 ◽  
Vol 34 (3) ◽  
pp. 646-653 ◽  
Author(s):  
Songlin Cheng

Since the pioneer publication of K. O. Münnich (1957), 14C systematics have been used in many hydrogeological studies. Because of the complexity of carbon geochemistry, numerous models have been proposed to correct the dilution effect of “dead” carbon in groundwater. All the 14C correction models for dating groundwater are based on either open- or closed-system conditions. I present here a simple model that accounts for the effects of both open- and closed-system dissolution of carbonate and aluminosilicate minerals. For systems involving precipitation of carbonate minerals and redox reactions of organic matter, reaction-path simulations are essential for reliable 14C dating of groundwater.


1986 ◽  
Vol 97 (1) ◽  
pp. 139-161 ◽  
Author(s):  
V. Susan Springthorpe ◽  
Jodi L. Grenier ◽  
Nellie Lloyd-Evans ◽  
Syed A. Sattar

SUMMARYSuspension tests were conducted on 69 commercial and 7 non-commercial disinfectant formulations to determine which classes of chemicals were most active against human rotavirus (HRV). Virus samples, in the presence of varying levels of organic matter, were exposed to the disinfectants for 1 min. The levels of remaining infectious virus were determined by plaque assay. Products were rated by their ability to reduce the levels of infectious virus by more than 3 log10in the presence or absence of tryptose phosphate broth (peptides and inorganic salts) or fecal matter.Of the commercially-available products tested, only 25% were rated as highly and 7% as moderately effective. The remaining 68% were either effective only in the absence of any additional organic matter (48%) or were completely ineffective (20%). The majority (64%) of the moderately and highly effective products were further examined for their ability to inactivate > 6 log10of infectious HRV in the presence of fecal matter or tryptose phosphate broth. With one exception, all these products were still effective. Products potentially suitable as topical antiseptics, hard surface disinfectants and instrument soaks were identified. The results emphasize the care that should be exercised in the selection of disinfectants for the control and prevention of rotaviral infections.


2021 ◽  
Author(s):  
Claudio Fernando Mahler ◽  
Nicoly Dal Santo Svierzoski ◽  
Cassiano Augusto Rolim Bernardino

Humic substances are the main constituents of natural organic matter, found in both aquatic and terrestrial environments. Humic substances are a complex, dispersed, and heterogeneous mixture of various organic compounds synthesized from organic matter residues, decomposed by microorganisms. Most scientists indicate that humic substances are as a supramolecular association of small heterogeneous molecules stabilized by weak intermolecular bonds. When these substances are presented in water intended for drinking or industrial use, it can have a significant impact on the treatability of this water and on the success of chemical disinfection processes, due to possible formation of organic compounds harmful to human health. Moreover, the humic substances can be used of several ways such as fertilizer to help in the development of plants, to improve soil erosion and to removal of organic compounds and metals from soils and waters. In addition, humic substances suggest an important role in mitigating areas degraded by the phytoremediation technique. The purpose of chapter is to provide an overview of humic substances and to discuss their concepts, chemical characteristics, ecological effects and technological applications for soils and aquatic systems.


2018 ◽  
Vol 185 ◽  
pp. 23-32 ◽  
Author(s):  
Xiaoqiang Li ◽  
Bernhard M. Krooss ◽  
Christian Ostertag-Henning ◽  
Philipp Weniger ◽  
Ralf Littke
Keyword(s):  

2020 ◽  
Vol 6 (3) ◽  
pp. 779-794 ◽  
Author(s):  
Anna Andersson ◽  
Elin Lavonen ◽  
Mourad Harir ◽  
Michael Gonsior ◽  
Norbert Hertkorn ◽  
...  

Disinfection by-products (DBPs) are potentially toxic compounds formed upon chemical disinfection of drinking water. This study evaluate how treatment approaches affect DBP formation and composition.


1960 ◽  
Vol 6 (5) ◽  
pp. 583-589 ◽  
Author(s):  
J. D. Menzies

The principle of logarithmic dilution resulting from passage of a diluent through a solution in a closed system is used in an apparatus for obtaining samples of soil suspension of known dilution for microbial assay. The device consists of a 14-ml glass chamber containing a magnetic agitator. As sterile water flows through the chamber in which a soil sample has been placed, the dilution of the sample in the effluent depends upon the amount of water used. Samples of effluent can thus be collected for replicated plating at any desired dilution, or aliquots can be plated directly at dilution intervals selected so that some portion of the series will yield plates with the optimum number of colonies for counting. The method is simple and timesaving and should compare favorably in accuracy with conventional procedures.


2016 ◽  
Vol 154-155 ◽  
pp. 213-239 ◽  
Author(s):  
Nikola Vuković ◽  
Dragana Životić ◽  
João Graciano Mendonça Filho ◽  
Tamara Kravić-Stevović ◽  
Mária Hámor-Vidó ◽  
...  

Water ◽  
2021 ◽  
Vol 13 (2) ◽  
pp. 146
Author(s):  
Raymond John C. Go ◽  
Hui-Ling Yang ◽  
Chi-Chuan Kan ◽  
Dennis C. Ong ◽  
Sergi Garcia-Segura ◽  
...  

Chemical disinfection of surface waters has been proven effective in minimizing the risk of contamination by water-borne pathogens. However, surface waters contain natural organic matter (NOM) which, upon chemical disinfection, is readily converted into hazardous disinfection-by-products. Hence, NOM removal from these waters is critical. Chemical coagulation is a readily implementable technology to minimize these undesired side-effects by NOM removal. Herein, capabilities of ferric chloride (FeCl3) and polyaluminum chloride (PACl) as pre-treatment for NOM abatement from natural raw surface water have been benchmarked. Excitation-emission fluorescence matrix (EEM) spectroscopy characterization of NOM fractions demonstrated high removal efficiency. A two-level full factorial design was employed to analyze the effects of coagulant dosage and initial pH on the removal of turbidity, humic acid-like substances and fulvic acid-like substances from the raw water. Higher removal of ~77% NOM was attained with PACl than with FeCl3 (~72%). Optimization through response surface methodology showed that the initial pH—coagulant dosage interaction was significant in removing NOM and turbidity for both PACl and FeCl3. These results identify the opportunity for coagulation technologies to prevent and minimize disinfection-by-products formation through NOM removal.


2019 ◽  
Vol 6 (2) ◽  
pp. 119-123
Author(s):  
Masoumeh Moghaddam Arjmand

The sanitation of the hospital environment for the purpose of preventing the transmission of nosocomial infections has a major role in reducing the infection of hospitalized patients with the bacteria living on hospital surfaces. The excessive use of chemical detergents in recent decades has led to microbial resistance in nosocomial infectious bacteria. Researchers’ attention has therefore been drawn to the use of probiotics for disinfecting hospital surfaces. The present study was conducted to assess the potential effectiveness of probiotic products in controlling the contamination of inert surfaces in the environment and medical instruments in health centers and investigate the claim that the antagonistic property of probiotic microorganisms offers an effective method for controlling nosocomial infections and a suitable alternative to conventional disinfection methods. A search was carried out for relevant articles published from 2000 to 2018 in databases including ISI, PubMed, Scopus, EMBASE, and Google Scholar, using the keywords "nosocomial infections", "disinfection", "sanitation", "probiotics" and "infected surfaces". The articles published from 2000 to 2018 confirmed the greater effectiveness of probiotic disinfection (by up to 90%) compared to conventional chemical disinfection in controlling nosocomial infections. Nevertheless, more extensive studies are needed on probiotics to determine the possibility of replacing good bacteria with bad bacteria in future decades.


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