Group items tagged

"hot spots" of contaminated sediment.

Pathogens such as bacteria and viruses, which are often presentin urban runoff, can pose public health problems.

Drains Versus 400 or More Yards Away Found On Hard Copy-Storm Drain Runoff," Epidemiology, July 1999, Vol. 10, No. 4.Metals and polycyclic aromatic hydrocarbons (PAH) in urban runoffcan present a threat to aquatic life.

proved to betoxic to sea urchin fertilization in the Santa Monica Bay, anddissolved zinc and copper were determined to be contributors tothis toxicity. -Brown bullheads (a bottom-dwelling catfish) inthe Anacostia River developed tumors that were believed to becaused by PAHs associated in part with urban runoff. High PAHand heavy metal concentrations were found in crayfish tissuesamples from several urban streams in Milwaukee. The studyassociated these contaminants with storm water runoff.

The three primaryactivities used in these programs include efforts to characterizestorm water runoff; BMPs aimed at reducing pollutants in stormwater runoff to the maximum extent practicable; and reportingprogram activities, monitoring results, and costs of implementingthe program. Some BMPs are structural-meaning that they aredesigned to trap and detain runoff until constituents settle orare filtered out.

-good housekeeping" practices by the local government, such asoil collection and recycling, spill response, household andhazardous waste collection, pesticide controls, flood controlmanagement, and street sweeping; -public education programs, suchas storm-drain stenciling, to remind the public that trash, motoroil, and other pollutants thrown into storm drains end up innearby receiving waters;' -new ordinances to control pollutionsources, such as prohibiting the disposal of lawn clippings instorm drains and requiring pet owners to clean up after theirpets;" requirements that developers comply with storm waterregulations and incorporate erosion and sediment controls at allnew development sites; -requirements that runoff from propertiesowned or activities sponsored by the municipality be properlycontrolled; and -efforts to identify and eliminate illicitconnections and illegal discharges to the storm sewer systems,such as those from pipes carrying sewage.

Several officials in the cities we visited said that their annualcosts are likely to increase. A number of factors could affectthe costs. For example, a Baltimore City official explained thatthe anticipated, future program costs depend on several factors,including (1) requirements in watershed- management planscurrently being developed, (2) pollution-reduction goals the citywill be required to achieve, (3) requirements of the stateregulatory agency in future permits, and (4) requirements thecity may have to meet if TMDLs or numeric effluent limits areincorporated into NPDES storm water permits. Other city officialsalso expressed concern about the extent to which TMDLs couldaffect their future costs. These city officials are concernedthat when and if TMDLs are established, their future storm waterpermits may require that storm water runoff meet specific waterquality standards. For example, Los Angeles County's trash TMDLcould potentially drive the county's storm water management costsupward, and the county expects additional TMDLs to be imposed. Onthe other hand, Worcester officials estimated that their futurestorm water costs would be about the same as they were at thetime of our review-about $4.5 million per year.

Building Mass and Strength Mass- and strength-enhancing drugs used by athletes include: Anabolic steroids Beta-2 agonists Human chorionic gonadotropin (hCG) Luteinizing hormone (LH) Human growth hormone (hGH) Insulin-like growth factor (IGF-1) Insulin

A steroid is a chemical substance derived from cholesterol.

he body has several major steroid hormones -- cortisol and testosterone in the male, estrogen and progesterone in the female. Catabolic steroids break down tissue, and anabolic steroids build up tissue. Anabolic steroids build muscle and bone mass primarily by stimulating the muscle and bone cells to make new protein.

Athletes use anabolic steroids because they increase muscle strength by encouraging new muscle growth. Anabolic steroids are similar in structure to the male sex hormone, testosterone, so they enhance male reproductive and secondary sex characteristics (testicle development, hair growth, thickening of the vocal cords). They allow the athlete to train harder and longer at any given period.

Anabolic steroids are mostly testosterone (male sex hormone) and its derivatives. Examples of anabolic steroids include: Testosterone Dihydrotestosterone Androstenedione (Andro) Dehydroepiandrosterone (DHEA) Clostebol Nandrolone

hese substances can be injected or taken as pills. Anabolic steroids have a number of possible and well-known side effects, including: Jaundice and liver damage because these substances are normally broken down in the liver Mood swings, depression and aggression because they act on various centers of the brain In males, the excessive concentrations interfere with normal sexual function and cause: Baldness Infertility Breast development

In females, the excessive concentrations cause male characteristics to develop and interfere with normal female functions. The drugs can: Stimulate hair growth on the face and body Suppress or interfere with menstrual cycle, possibly leading to infertility Thicken the vocal cords, which causes the voice to deepen, possibly permanently If pregnant, interfere with the developing fetus

Deductive reasoning involves deciding what must be true given the rules of logic

Inductive reasoning involves deciding what is likely

Deductive reasoning derives the logically necessary conclusion from the given premises.

it can lead to a logical conclusion which conflicts with our knowledge of the world

Human deduction is at its poorest when truth and validity clash

people bring their knowledge of the real world into the reasoning process

Induction is generalizing from cases we have seen to infer information about cases we haven't

In the absence of counter examples, all that we can do is gather evidence to support our inductive inference

Abduction reasons from a fact to the action that caused it

can lead to unreliability as an action preceding an event can be wrongly attributed as the cause of the event.

Problem solving is the process of finding a solution to an unfamiliar task

Gestalt theory and the problem space theory.

productive problem solving involves insight and restructuring of the problem

productive and reproductive

Reproductive problem solving draws on previous experiences

Reproductive problem solving could be a hindrance to finding a solution

theory says that problem solving centers around the problem space.

People solve novel problems by mapping knowledge in a similar known domain, to it

people miss analogous information unless it is semantically close to the problem domain.