Home Builder Developer - Interior Renovation and Design

My window cleaning truck
How I organized my window cleaning truck.

By: Luke Stenner

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My window cleaning truck - Video

window cleaning on a hot day
window cleaning on a commercial job .

By: Luke Stenner

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window cleaning on a hot day - Video

Guideline for Disinfection and Sterilization in Healthcare Facilities, 2008 [PDF - 948 KB]

Cleaning is the removal of foreign material (e.g., soil, and organic material) from objects and is normally accomplished using water with detergents or enzymatic products. Thorough cleaning is required before high-level disinfection and sterilization because inorganic and organic materials that remain on the surfaces of instruments interfere with the effectiveness of these processes. Also, if soiled materials dry or bake onto the instruments, the removal process becomes more difficult and the disinfection or sterilization process less effective or ineffective. Surgical instruments should be presoaked or rinsed to prevent drying of blood and to soften or remove blood from the instruments.

Cleaning is done manually in use areas without mechanical units (e.g., ultrasonic cleaners or washer-disinfectors) or for fragile or difficult-to-clean instruments. With manual cleaning, the two essential components are friction and fluidics. Friction (e.g., rubbing/scrubbing the soiled area with a brush) is an old and dependable method. Fluidics (i.e., fluids under pressure) is used to remove soil and debris from internal channels after brushing and when the design does not allow passage of a brush through a channel 445. When a washer-disinfector is used, care should be taken in loading instruments: hinged instruments should be opened fully to allow adequate contact with the detergent solution; stacking of instruments in washers should be avoided; and instruments should be disassembled as much as possible.

The most common types of mechanical or automatic cleaners are ultrasonic cleaners, washer-decontaminators, washer-disinfectors, and washer-sterilizers. Ultrasonic cleaning removes soil by cavitation and implosion in which waves of acoustic energy are propagated in aqueous solutions to disrupt the bonds that hold particulate matter to surfaces. Bacterial contamination can be present in used ultrasonic cleaning solutions (and other used detergent solutions) because these solutions generally do not make antibacterial label claims 446. Even though ultrasound alone does not significantly inactivate bacteria, sonication can act synergistically to increase the cidal efficacy of a disinfectant 447. Users of ultrasonic cleaners should be aware that the cleaning fluid could result in endotoxin contamination of surgical instruments, which could cause severe inflammatory reactions 448. Washer-sterilizers are modified steam sterilizers that clean by filling the chamber with water and detergent through which steam passes to provide agitation. Instruments are subsequently rinsed and subjected to a short steam-sterilization cycle. Another washer-sterilizer employs rotating spray arms for a wash cycle followed by a steam sterilization cycle at 285oF 449, 450. Washer-decontaminators/disinfectors act like a dishwasher that uses a combination of water circulation and detergents to remove soil. These units sometimes have a cycle that subjects the instruments to a heat process (e.g., 93C for 10 minutes) 451. Washer-disinfectors are generally computer-controlled units for cleaning, disinfecting, and drying solid and hollow surgical and medical equipment. In one study, cleaning (measured as 56 log10 reduction) was achieved on surfaces that had adequate contact with the water flow in the machine 452. Detailed information about cleaning and preparing supplies for terminal sterilization is provided by professional organizations 453, 454 and books 455. Studies have shown that manual and mechanical cleaning of endoscopes achieves approximately a 4-log10 reduction of contaminating organisms 83, 104, 456, 457. Thus, cleaning alone effectively reduces the number of microorganisms on contaminated equipment. In a quantitative analysis of residual protein contamination of reprocessed surgical instruments, median levels of residual protein contamination per instrument for five trays were 267, 260, 163, 456, and 756 g 458. In another study, the median amount of protein from reprocessed surgical instruments from different hospitals ranged from 8 g to 91 g 459. When manual methods were compared with automated methods for cleaning reusable accessory devices used for minimally invasive surgical procedures, the automated method was more efficient for cleaning biopsy forceps and ported and nonported laparoscopic devices and achieved a >99% reduction in soil parameters (i.e., protein, carbohydrate, hemoglobin) in the ported and nonported laparoscopic devices 460, 461

For instrument cleaning, a neutral or near-neutral pH detergent solution commonly is used because such solutions generally provide the best material compatibility profile and good soil removal. Enzymes, usually proteases, sometimes are added to neutral pH solutions to assist in removing organic material. Enzymes in these formulations attack proteins that make up a large portion of common soil (e.g., blood, pus). Cleaning solutions also can contain lipases (enzymes active on fats) and amylases (enzymes active on starches). Enzymatic cleaners are not disinfectants, and proteinaceous enzymes can be inactivated by germicides. As with all chemicals, enzymes must be rinsed from the equipment or adverse reactions (e.g., fever, residual amounts of high-level disinfectants, proteinaceous residue) could result 462, 463. Enzyme solutions should be used in accordance with manufacturer's instructions, which include proper dilution of the enzymatic detergent and contact with equipment for the amount of time specified on the label 463. Detergent enzymes can result in asthma or other allergic effects in users. Neutral pH detergent solutions that contain enzymes are compatible with metals and other materials used in medical instruments and are the best choice for cleaning delicate medical instruments, especially flexible endoscopes 457. Alkaline-based cleaning agents are used for processing medical devices because they efficiently dissolve protein and fat residues 464; however, they can be corrosive 457. Some data demonstrate that enzymatic cleaners are more effective than neutral detergents 465, 466 in removing microorganisms from surfaces but two more recent studies found no difference in cleaning efficiency between enzymatic and alkaline-based cleaners 443, 464. Another study found no significant difference between enzymatic and non-enzymatic cleaners in terms of microbial cleaning efficacy 467. A new non-enzyme, hydrogen peroxide-based formulation (not FDA-cleared) was as effective as enzymatic cleaners in removing protein, blood, carbohydrate, and endotoxin from surface test carriers468. In addition, this product effected a 5-log10 reduction in microbial loads with a 3-minute exposure at room temperature 468.

Although the effectiveness of high-level disinfection and sterilization mandates effective cleaning, no "real-time" tests exist that can be employed in a clinical setting to verify cleaning. If such tests were commercially available they could be used to ensure an adequate level of cleaning 469-472. ). The only way to ensure adequate cleaning is to conduct a reprocessing verification test (e.g., microbiologic sampling), but this is not routinely recommended 473. Validation of the cleaning processes in a laboratory-testing program is possible by microorganism detection, chemical detection for organic contaminants, radionuclide tagging, and chemical detection for specific ions 426, 471. During the past few years, data have been published describing use of an artificial soil, protein, endotoxin, X-ray contrast medium, or blood to verify the manual or automated cleaning process 169, 452, 474-478 and adenosine triphosphate bioluminescence and microbiologic sampling to evaluate the effectiveness of environmental surface cleaning 170, 479. At a minimum, all instruments should be individually inspected and be visibly clean.

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Yews (Taxus) trees and shrubs types, planting and care

Splendid Evergreens for Many Landscape Uses

Taxus (Tax'us) are beautiful evergreen trees and shrubs that are natives of North America, Europe and Asia. They belong to the Yew family, Taxaceae. The name is an old Latin one for Taxus baccata, the European Yew.

The leaves are small and, in most cases, are dark green on wild trees, but they are variable in color on cultivated forms. Male and female flowers are usually produced on different trees in early spring. The male flowers are yellow and produced in small catkins; the female flowers are greenish, very small, and difficult to find. The fruit is a small, hard, dark green or brownish seed surrounded, except at the apex, by a fleshy envelope that is red and juicy when ripe.

Shoots, leaves and seeds contain poisonous properties, and have proved fatal to both human beings and cattle. This is especially true of the English Yew. The flesh surrounding the seeds, however, is not toxic, and it is interesting to note that deer eat the foliage of Taxus cuspidata with relish and without apparent harm.

It is generally understood that shoots and leaves are in their most dangerous state when partly withered.

Valuable for Landscaping. Yews are among the finest evergreens for landscaping uses. In addition to the wild kinds, there are numerous garden varieties and hybrids which show great variation in height, habit of growth and other important characteristics and this makes it possible for the planter to select from among them those that suit his purposes best.

Yews, allowed to grow without clipping or shearing, develop into magnificent specimen plants, but they stand pruning well and are among the finest of all evergreens for planting as formal hedges and for topiary work. (See Topiary Work.) The prostrate and spreading kinds are effective ground covers.

Yews may be transplanted without undue difficulty even when quite large. Should they outgrow their allotted space, they may be pruned back severely and will "break" (put forth new shoots) even from thick old branches that have been cut back. In this respect they differ from many other evergreens.

Yews Thrive in Most Soils. Very fine old trees are often found growing naturally on limestone soils, but they also grow on sandy loam, heavy loam and on peat. They do not succeed where the subsoil is waterlogged, and even old trees may be killed by the sudden raising of the natural water level, as is brought about by flooding or by the silting up of ditches or open drains, obstructions in drainpipes or by grading operations.

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SDO Team 10: Autonomous Robotic Sprinkler System Q A Session, FIU ME Spring 2015
SDO: Senior Design Organization, Spring 2015 Introduction of Projects to the Industrial Advisory Board Department of Mechanical and Materials Engineering Florida International University Miami,...

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SDO Team 10: Autonomous Robotic Sprinkler System Q&A Session, FIU ME Spring 2015 - Video