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By S. Felipe. Daniel Webster College.

Blonde hair is characterized by low levels of the dark pigment eumelanin and higher levels of the pale pigment pheomelanin buy fosamax 35 mg mastercard. In certain European populations cheap fosamax 70mg without prescription, the occurrence of blonde hair is more frequent generic 35 mg fosamax fast delivery, and often remains throughout adulthood, leading to misinter- pretation that blondeness is a uniquely European trait. Based on recent genetic information, it is probable that humans with blonde hair became more numerous in Europe about 10,000 to 11,000 years ago during the last ice age, as a result of Fisherian runaway mechanisms. Prior to this, early Europeans had dark brown hair and dark eyes, as is predominant in the rest of the world. In humans of many ethnicities, lighter hair colors occur naturally as rare mutations, but at such low rates that it is hardly noticeable in most adult populations. Light hair color is commonly seen in children, and is curiously common in children of the Australian Aboriginal population. Bleached blonde hair can be distinguished from natural blonde hair by exposing it to ultraviolet light, as heavily bleached hair will glow, while natural blonde hair will not. There are no comparable data for red hair, but in the areas of obvious frequency (the fringes of Western and Eastern Europe) it is at a maximum of 10%. Controversial estimations of the original occurrence of the red-haired gene at 40,000 years ago are probable. Red hair is associated with the melanocortin-1 receptor, which is found on chromosome 16. When only one copy of the red-hair allele is present, red hair may blend with the other hair color, resulting in different types of red hair including strawberry blonde (red-blonde) and auburn (red-brown). The Record of the Hair The hair shaft records repeated cosmetic practices—the so-called record of the hair (7). Newly emerging hair has properties that are different from those of the hair tips. The more distal part of the hair shaft, particularly the tip, has typically undergone several hundred washes, the application of hot styling implements, and other cosmetic procedures such as bleaching, perma- nent coloring, and perming in addition to normal exposure to the environment. Genetic evidence suggests that Homo sapiens originated only 200,000–250,000 years ago somewhere in the East African savannah. Despite their apparent phenotypic variation, today’s world population is potentially derived from as few as 1,000 to 10,000 individuals. Using average rates of genetic mutation, this population lived at a time that coincided with the massive Toba volcanic disas- ter, which affected global climate, effectively wiped out all other hominids, and devastated Homo sapiens. Descendants of these “modern” humans migrated out of Africa when the climate improved and populated the earth. This is due in the most part to the gross reduction in breeding pairs in the late Pleistocene era. This core of humanity, survived near-extinction and went on to populate the entire world in less than 5000 genera- tions. In less than 100 generations and 2000 years, world population has risen from 3 million to 6 billion. Of the remainder, 14% live in the Americas, 13% in Africa, and 12% in Europe with only 0. Hair form arose from these clans and, as much as skin color, denotes local origins. Despite serial migrations, the original groups have been preserved largely on a regional basis. Bands, which are the simplest form of human society, and still exist (Inuit, indigenous Australians) expanded into clans and sub- sequently tribes. Until the advent of global agriculture some 7,000 ago, genetic lineages were probably tightly maintained. Where and when the emergence of the archetypal hair forms that are described in the literature occurred is not known. Similarly, knowledge of the hair phenotype of early humans and whether the tightly curled hair of today’s equatorial Africa or a more wavy appearance predominated is speculative (Figs. Demonstrat- ing that environmental selective pressures shaped specific physical features is difficult, since such features may have resulted from sexual selection for individuals. Causcasoid, Negroid, and Mongoloid The literature perpetuates the taxonomy of hair as caucasoid, negroid, and mongoloid. These terms not only have a pejorative ring but from a practical standpoint are scientifically inac- curate and no longer employed by publishers. Hair Morphology Studies Human hair morphology varies from the flat to the round (Fig. Her hair displays varied phenotypic adaptability—straight hair when pregnant and tightly coiled in the nonpregnant state. Curiously she is a doppleganger for the proposed African Eve published in Newsweek (see Fig. In many parts of the world, groups have mixed in such a way that many individuals have relatively recent ancestors from widely separated regions. Although genetic analyses of large numbers of loci can produce estimates of the percentage of a person’s ancestors coming from various continental populations (10,11), these estimates may assume a false distinctiveness of the parental populations since human groups have exchanged mates from local to continental scales throughout history (12). Even with large numbers of markers, information for estimat- ing admixture proportions of individuals or groups is limited and estimates typically will have wide confidence intervals (13). The alleged relationship between the cross-sectional shape of the hair shaft and the form of the hair, e. Three-dimensional computer-aided reconstructions have documented that the follicle form determines the appearance of the hair, e. In vitro growth of curly hair follicles was slightly slower than that of Caucasian follicles but, more importantly, the curvature was maintained in the hair shaft produced in vitro. Immu- nohistochemistry revealed that the proliferative matrix compartment of curly hair follicles was asymmetrical, with Ki-67-labeled cells more numerous on the convex side and extending above the Auber line. The authors concluded that hair curliness is programmed from the bulb and is linked to asymmetry in differentiation programs. The differences in the patterns between the inner and the outer sides of the curvature were successfully detected (16). The analysis of the equatorial and azi- muthal scattering intensity profiles showed that the arrangement of the intermediate filaments was different between the inner and the outer sides of the curvature. From the analogy with Merino and Romny wool, it is suggested that different types of cortices exist in human hair. It is concluded that, regardless of the ethnic origins, the macroscopic curl shape of the hair fiber originates from the nonhomogeneity of the internal nanostructure, arising from unhomoge- neous distribution of two types of cortices. Adaptive Changes in Hair Morphology Since Africa is the home of humankind, it is appropriate to commence here with a discussion of hair morphology. The classical hair of equatorial Africa is also seen in equatorial regions of Indonesia and Australia.

This escape is no easy task purchase 70mg fosamax fast delivery, but it has been done by others and it can be done by you buy fosamax cheap. The first thing you must do is understand that ignorance of the miraculous does not mean the miraculous does not exist buy fosamax 70mg line. Sure, we can all recount stories of how we know someone who believed God and was not healed. If you knew one hundred or one thousand people who believed God and were not healed, what would that mean? Of course, we can’t reasonably expect our faith to not be negatively affected by the knowledge of so many failures. It’s not wrong to ask the question, “If God is almighty, and He desires everyone to be healed, why are there so few miraculous healings through prayer? Failure to ask this legitimate question, or to criticize someone for asking it, is to behave as false religions which discourage or prohibit one to use one’s mind. If in our logic we conclude that since everyone is not healed, God does not want everyone healed, we fall into the trap of allowing our experience to determine what part of God’s word is true. We also apply a logic upon physical healing that we wouldn’t dare apply to spiritual healing. If we did apply this logic in the same way, we would have to conclude that since God is almighty, and He desires all to be saved, then everyone should be saved. If they aren’t saved, as the logic goes, it’s because He either can’t save them or the day of salvation is over. Is it right to say that the day of salvation is gone simply because everyone is not saved? Is it right to say God’s will must be that some go to hell since the vast majority of people go to hell instead of heaven? An almighty God who desires people to go to heaven would make them go to heaven, wouldn’t He? Therefore, we conclude that it is neither God’s lack of power or desire that damns people to everlasting punishment. What we are left with is a contradiction between the scriptural ideal of universal salvation and the sad reality that most people are going to hell. How can salvation be made available for everyone by an all-powerful God, and yet most people are not and will not be saved? For God sent not his Son into the world to condemn the world; but that the world through him might be saved. If we are true to our method of interpreting the Bible by our experience, we must declare without reservation that spiritual healing is either not for today, or it’s only for some people. Yet should a minister boldly and consistently preach this, the church—myself included—will declare that doctrine false. So why do we so quickly use faulty logic to answer the contradiction listed below? The kind of ignorance of which I speak is that seen exhibited by Philip, an apostle of Jesus. After spending three years with Jesus day and night, and receiving one- on-one instruction from Him, Philip asked the Lord a question that prompted Jesus to ask Philip whether he really knew Him: “Philip saith unto him, Lord, shew us the Father, and it sufficeth us. Jesus saith unto him, Have I been so long time with you, and yet hast thou not known me, Philip? To ask to see the Father is the same as saying the Father is different (in character and essence) from Jesus. If this is so, we still don’t know God, and many of Jesus’ words are puzzles which can never be understood. For if Jesus spent so much time teaching us in so many ways and with so many words that He and the Father are one, and yet the obvious meaning of these words are in actuality a mystery, we are yet ignorant of the Father. If this is true, most of the books of Matthew, Mark, Luke, and John are absolutely useless. However, the truth of the matter is that what Jesus said about Himself and the Father agreeing in every way is not a mystery; it is an obvious truth. For instance, after reading Matthew, Mark, Luke, and John, how could anyone claim to not know God’s will in healing—unless he doesn’t understand that Jesus meant what He said about He and His Father being one? And how could anyone ever claim to not know that the Father is always against disease and always for healing? One can only do this if one doesn’t know Jesus came to give us a perfect picture of God. Here are a few scriptures that plainly tell us Jesus came to represent God: “I can of mine own self do nothing: as I hear, I judge: and my judgment is just; because I seek not mine own will, but the will of the Father which hath sent me. Jesus answered, Ye neither know me, nor my Father: if ye had known me, ye should have known my Father also. To say otherwise is to say that Jesus the Son and God the Father worked against one another. But we know that Jesus did not work against his Father, and we know that his Father did not work against him. As the scripture says so clearly, the Father, Son, and Holy Spirit worked together to heal the sick and cast out devils: “How God [the Father] anointed Jesus [the Son] of Nazareth with the Holy Ghost [the Holy Spirit] and with power: who went about doing good, and healing all that were oppressed of the devil; for God was with him. Anyone who honestly studies the word of God will have to agree that God and Jesus and the Holy Spirit hate sickness, disease, and Satan. Nowhere in the Bible are sickness, disease, and demonic affliction treated as blessings. Yet for all the overwhelming Bible evidence that God sees sickness and disease as a curse, many stubbornly refuse to admit this. The Obstacle of Willful and Deliberate Unbelief There is an unbelief that results from simply not having knowledge. If one doesn’t know enough about a thing, one can not have strong faith concerning that thing. The idea of blind faith may be an ingredient of cults and false religions, but it has no place in our relationship with Jesus Christ. The conscience is that part of us that says, I can’t quite put my finger on it, but there’s something wrong here. And there is something definitely wrong with telling a person to have faith in something without giving proof adequate enough to satisfy the intelligent questions of an honest conscience. However, our God has never told us to blindly accept what we’re told--even in regards to healing. In 1 Thessalonians 5:23, we are specifically told to “prove all things; hold fast that which is good. If what we’re told can’t stand the test of honest scrutiny, it’s false and should be rejected.

Epidemic measures: Outbreaks of varicella are common in schools and other institutional settings; they may be protracted best 35mg fosamax, disruptive and associated with complications cheap fosamax 35mg with amex. Infectious cases should be isolated and susceptible contacts immunized promptly (or referred to their health care provider for immunization) purchase generic fosamax online. Disaster implications: Outbreaks of chickenpox may occur among children crowded together in emergency housing situations. Chlamydiae are obligate intracellular bacteria that differ from viruses and rickettsiae but, like the latter, are sensitive to broad-spectrum antimicrobials. Those that cause human disease are classified into 3 species: 1) Chlamydia psittaci, the etiologic agent of psittacosis (q. Chlamydiae are increasingly recognized as important pathogens respon- sible for several sexually transmitted infections, with infant eye and lung infections consequent to maternal genital infection. Identification—Sexually transmitted genital infection is mani- fested in males primarily as a urethritis, and in females as a cervical infection. Clinical manifestations of urethritis are often difficult to distin- guish from gonorrhoea and include moderate or scanty mucopurulent discharges, urethral itching, and burning on urination. Possible complications or sequelae of male urethral infections include epididymitis, infertility and Reiter syndrome. In homosexual men, receptive anorectal intercourse may result in chlamydial proctitis. In the female, the clinical manifestations may be similar to those of gonorrhoea and may present as a mucopurulent endocervical discharge, with oedema, erythema and easily induced endocervical bleeding caused by inflammation of the endocervical columnar epithelium. Complications and sequelae include salpingitis with subsequent risk of infertility, ectopic pregnancy or chronic pelvic pain. Asymptomatic chronic infections of endometrium and fallopian tubes may lead to the same outcome. Less frequent manifestations include Bartholinitis, urethral syndrome with dysuria and pyuria, perihepatitis (Fitz-Hugh-Curtis syn- drome) and proctitis. Infection during pregnancy may result in premature rupture of membranes and preterm delivery, and conjunctival and pneu- monic infection of the newborn. Chlamydial infections may be acquired concurrently with gonorrhoea and persist after gonorrhoea has been treated successfully. The intracellular organisms are less readily recoverable from the discharge itself. Occurrence—Common worldwide; recognition has increased steadily in the last two decades. No acquired immunity has been demonstrated; cellular immunity is immunotype-specific. Preventive measures: 1) Health and sex education; same as for syphilis (see Syphilis, 9A), with emphasis on use of a condom when engaging in sexual intercourse. Screening of adult women should also be considered if they are under 25, have multiple or new sex partners, and/or use barrier contraceptives inconsistently. Control of patient, contacts and the immediate environment: 1) Report to local health authority: Case report is required in many industrialized countries, Class 2 (see Reporting). As a minimum, concurrent treatment of regular sex partners is a practical approach to management. If neonates born to infected moth- ers have not received systemic treatment, chest X-rays at 3 weeks of age and again after 12–18 weeks may be considered to exclude subclinical chlamydial pneumonia. Erythromycin is an alternative drug of choice for newborn and for women with a known or suspected pregnancy. Herpesvirus simplex type 2 is rarely implicated; Trichomonas vaginalis, though rarely implicated, has been shown to be a significant cause of urethritis in some high prevalence settings. Identification—Sexually transmitted genital infection is mani- fested in males primarily as a urethritis, and in females as a cervical infection. Clinical manifestations of urethritis are often difficult to distin- guish from gonorrhoea and include moderate or scanty mucopurulent discharges, urethral itching, and burning on urination. Possible complications or sequelae of male urethral infections include epididymitis, infertility and Reiter syndrome. In homosexual men, receptive anorectal intercourse may result in chlamydial proctitis. In the female, the clinical manifestations may be similar to those of gonorrhoea and may present as a mucopurulent endocervical discharge, with oedema, erythema and easily induced endocervical bleeding caused by inflammation of the endocervical columnar epithelium. Complications and sequelae include salpingitis with subsequent risk of infertility, ectopic pregnancy or chronic pelvic pain. Asymptomatic chronic infections of endometrium and fallopian tubes may lead to the same outcome. Less frequent manifestations include Bartholinitis, urethral syndrome with dysuria and pyuria, perihepatitis (Fitz-Hugh-Curtis syn- drome) and proctitis. Infection during pregnancy may result in premature rupture of membranes and preterm delivery, and conjunctival and pneu- monic infection of the newborn. Chlamydial infections may be acquired concurrently with gonorrhoea and persist after gonorrhoea has been treated successfully. Because gonococcal and chlamydial cervicitis are often difficult to distinguish clinically, treatment for both organisms is recommended when one is suspected. The intracellular organisms are less readily recoverable from the discharge itself. Occurrence—Common worldwide; recognition has increased steadily in the last two decades. No acquired immunity has been demonstrated; cellular immunity is immunotype-specific. Preventive measures: 1) Health and sex education; same as for syphilis (see Syphilis, 9A), with emphasis on use of a condom when engaging in sexual intercourse. Screening of adult women should also be considered if they are under 25, have multiple or new sex partners, and/or use barrier contraceptives inconsistently. Control of patient, contacts and the immediate environment: 1) Report to local health authority: Case report is required in many industrialized countries, Class 2 (see Reporting). Appropriate antibiotherapy renders dis- charges noninfectious; patients should refrain from sexual intercourse until treatment of index patient and current sexual partners is completed. As a minimum, concurrent treatment of regular sex partners is a practical approach to management. If neonates born to infected moth- ers have not received systemic treatment, chest X-rays at 3 weeks of age and again after 12–18 weeks may be considered to exclude subclinical chlamydial pneumonia. Herpesvirus simplex type 2 is rarely implicated; Trichomonas vaginalis, though rarely implicated, has been shown to be a significant cause of urethritis in some high prevalence settings. Identification—An acute bacterial enteric disease characterized in its severe form by sudden onset, profuse painless watery stools (rice-water stool), nausea and profuse vomiting early in the course of illness. In untreated cases, rapid dehydration, acidosis, circulatory collapse, hypogly- caemia in children, and renal failure can rapidly lead to death. In most cases infection is asymptomatic or causes mild diarrhea, especially with organisms of the El Tor biotype; asymptomatic carriers can transmit the infection. In severe dehydrated cases (cholera gravis), death may occur within a few hours, and the case-fatality rate may exceed 50%.

The antibiotics commonly used for treatment are ampicillin purchase fosamax 70mg on line, trimethoprim/sulfamethoxazole (also known as Bactrim* or Septra*) fosamax 70 mg low cost, nalidixic acid purchase 35mg fosamax, or ciprofloxacin. Unfortunately, some Shigella bacteria have become resistant to antibiotics and using antibiotics to treat shigellosis can actually make the germs more resistant in the future. Persons with mild infections will usually recover quickly without antibiotic treatment. Therefore, when many persons in a community are affected by shigellosis, antibiotics are sometimes used selectively to treat only the more severe cases. Antidiarrheal agents such as loperamide (Imodium*) or diphenoxylate with atropine (Lomotil*) are likely to make the illness worse and should be avoided. Persons with diarrhea usually recover completely, although it may be several months before their bowel habits are entirely normal. About 3% of persons who are infected with one type of Shigella, Shigella flexneri, will later develop pains in their joints, irritation of the eyes, and painful urination. It can last for months or years, and can lead to chronic arthritis which is difficult to treat. Once someone has had shigellosis, they are not likely to get infected with that specific type again for at least several years. Shigella are present in the diarrheal stools of infected persons while they are sick and for a week or two afterwards. Most Shigella infections are the result of the bacterium passing from stools or soiled fingers of one person to the mouth of another person. It is particularly likely to occur among toddlers who are not fully toilet-trained. Family members and playmates of such children are at high risk of becoming infected. Food may become contaminated by infected food handlers who forget to wash their hands with soap after using the bathroom. Vegetables can become contaminated if they are harvested from a field with sewage in it. Shigella infections can also be acquired by drinking or swimming in contaminated water. Water may become contaminated if sewage runs into it, or if someone with shigellosis swims in it. Waterborne Diseases ©6/1/2018 193 (866) 557-1746 What can a person do to prevent this illness? However, the spread of Shigella from an infected person to other persons can be stopped by frequent and careful handwashing with soap. Frequent, supervised handwashing of all children should be followed in day care centers and in homes with children who are not completely toilet-trained (including children in diapers). When possible, young children with a Shigella infection who are still in diapers should not be in contact with uninfected children. People who have shigellosis should not prepare food or pour water for others until they have been shown to no longer be carrying the Shigella bacterium. After use, the diaper changing area should be wiped down with a disinfectant such as household bleach, Lysol* or bactericidal wipes. Basic food safety precautions and regular drinking water treatment prevents shigellosis. At swimming beaches, having enough bathrooms near the swimming area helps keep the water from becoming contaminated. Simple precautions taken while traveling to the developing world can prevent getting shigellosis. Drink only treated or boiled water, and eat only cooked hot foods or fruits you peel yourself. Because many milder cases are not diagnosed or reported, the actual number of infections may be twenty times greater. Shigellosis is particularly common and causes recurrent problems in settings where hygiene is poor and can sometimes sweep through entire communities. Children, especially toddlers aged 2 to 4, are the most likely to get shigellosis. Many cases are related to the spread of illness in child-care settings, and many more are the result of the spread of the illness in families with small children. In the developing world, shigellosis is far more common and is present in most communities most of the time. Chinese scientists have sequenced the genome of a bacterium that is a leading cause of infant mortality in developing countries. About one million people die of Shigella infections every year, most of them children. The bacterium Shigella flexneri causes sudden and severe diarrhea in humans, known as shigellosis. New treatments are needed for this highly infectious microbe because antibiotics are often inadequate and drug-resistant strains are on the rise. Currently, no vaccines exist and the World Health Organization considers the development of a vaccine a priority. Waterborne Diseases ©6/1/2018 194 (866) 557-1746 The publication of the genome sequence is an important step achieving this goal. It is transmitted in contaminated food or water and through contact between people. Upon infection, humans develop severe abdominal cramps, fever, and frequent passage of bloody stools. It is important for the public health department to know about cases of shigellosis. It is important for clinical laboratories to send isolates of Shigella to the City, County or State Public Health Laboratory so the specific type can be determined and compared to other Shigella. If many cases occur at the same time, it may mean that a restaurant, food or water supply has a problem which needs correction by the public health department. If a number of cases occur in a day-care center, the public health department may need to coordinate efforts to improve handwashing among the staff, children, and their families. When a community-wide outbreak occurs, a community-wide approach to promote handwashing and basic hygiene among children can stop the outbreak. Improvements in hygiene for vegetables and fruit picking and packing may prevent shigellosis caused by contaminated produce. Making municipal water supplies safe and treating sewage are highly effective prevention measures that have been in place for many years. The Food and Drug Administration inspects imported foods, and promotes better food preparation techniques in restaurants and food processing plants. The Environmental Protection Agency regulates and monitors the safety of our drinking water supplies. The government has also maintained active research into the development of a Shigella vaccine.

Water Disinfection Disinfection is usually the final stage in the water treatment process in order to limit the effects of organic material purchase generic fosamax from india, suspended solids and other contaminants purchase fosamax 70mg mastercard. There are numerous alternative disinfection processes that have been less widely used in small and very small water treatment systems buy 70 mg fosamax with amex, including chlorine dioxide, potassium permanganate, chloramines and peroxone (ozone/hydrogen peroxide). Surface waters have been the focal point of water disinfection regulations since their inception, as groundwaters (like wells) have been historically considered to be free of microbiological contamination. Amendments to the Safe Drinking Water Act in 1996 mandate the development of regulations to require disinfection of groundwater "as necessary. While these proposed regulations have not yet been finalized, they will likely include; testing by each state, identification of contaminated water supplies, corrective action requiring disinfection and compliance monitoring. Waterborne Diseases ©6/1/2018 521 (866) 557-1746 Chlorates are powerful oxidizers and should be kept away from organics or easily oxidized materials. Mixtures of chlorate salts with virtually any combustible material (sugar, sawdust, charcoal, organic solvents, metals, etc. Chlorates were once widely used in pyrotechnics for this reason, though their use has fallen due to their instability. The salts of hydrochloric acid contain chloride ions and can also be called chlorides. The chloride ion, and its salts such as sodium chloride, are very soluble in water. It is an essential electrolyte located in all body fluids responsible for maintaining acid/base balance, transmitting nerve impulses and regulating fluid in and out of cells. The word chloride can also form part of the name of chemical compounds in which one or more chlorine atoms are covalently bonded. Other salts such as calcium chloride, magnesium chloride, potassium chloride have varied uses ranging from medical treatments to cement formation. An example is table salt, which is sodium chloride with the chemical formula NaCl. Examples of inorganic covalently bonded chlorides that are used as reactants are:  Phosphorus trichloride, phosphorus pentachloride, and thionyl chloride, all three of which reactive chlorinating reagents that have been used in a laboratory. Calcium chloride is a salt2 that is marketed in pellet form for removing dampness from rooms. Calcium chloride is also used for maintaining unpaved roads and for sanite fortifying roadbases for new construction. In addition, Calcium chloride is widely used as a deicer since it is effective in lowering the melting point when applied to ice. In the petroleum industry, the chlorides are a closely monitored constituent of the mud system. An increase of the chlorides in the mud system may be an indication of drilling into a high-pressure saltwater formation. Waterborne Diseases ©6/1/2018 522 (866) 557-1746 Chloride is also a useful and reliable chemical indicator of river / groundwater fecal contamination, as chloride is a non-reactive solute and ubiquitous to sewage & potable water. Many water regulating companies around the world utilize chloride to check the contamination levels of the rivers and potable water sources. A chlorite (compound) is a compound that contains this group,2 with chlorine in oxidation state +3. Chlorine can assume oxidation states of -1, +1, +3, +5, or +7 within the corresponding anions Cl-, ClO-, ClO -, ClO -, or ClO -, known commonly and respectively as chloride,2 3 4 hypochlorite, chlorite, chlorate, and perchlorate. An additional oxidation state of +4 is seen in the neutral compound chlorine dioxide ClO , which has a similar structure to chlorite2 ClO - (oxidation state +3) and the cation chloryl (ClO +) (oxidation state +5). As one of several oxides of chlorine, it is a potent and useful oxidizing agent used in water treatment and in bleaching. The molecule ClO2 has an odd number of valence electrons and it is therefore a paramagnetic radical. Its electronic structure has long baffled chemists because none of the possible Lewis structures are very satisfactory. Chemist Linus Pauling further developed this idea and arrived at two resonance structures involving a double bond on one side and a single bond plus three-electron bond on the other. In molecular orbital theory this idea is commonplace if the third electron is placed in an anti-bonding orbital. Chlorine dioxide is a highly endothermic compound that can decompose extremely violently when separated from diluting substances. As a result, preparation methods that involve producing solutions of it without going through a gas phase stage are often preferred. In the laboratory, ClO is prepared by oxidation of sodium chlorite:2 2 NaClO + Cl - 2 ClO + 2 NaCl2 2 2 Over 95% of the chlorine dioxide produced in the world today is made from sodium chlorate and is used for pulp bleaching. It is produced with high efficiency by reducing sodium chlorate in a strong acid solution with a suitable reducing agent such as methanol, hydrogen peroxide, hydrochloric acid or sulfur dioxide. Modern technologies are based on methanol or hydrogen peroxide, as these chemistries allows the best economy and do not co-produce elemental chlorine. Two advantages by not using the chloride-based processes are that there is no formation of elemental chlorine, and that sodium sulfate, a valuable chemical for the pulp mill, is a side-product. A much smaller, but important, market for chlorine dioxide is for use as a disinfectant. Since 1999 a growing proportion of the chlorine dioxide made globally for water treatment and other small-scale applications has been made using the chlorate, hydrogen peroxide and sulfuric acid method, which can produce a chlorine-free product at high efficiency. Alternatively, hydrogen peroxide may efficiently be used also in small scale applications. Haloacetic Acids Haloacetic acids are carboxylic acids in which a halogen atom takes the place of a hydrogen atom in acetic acid. The inductive effect caused by the2 2 electronegative halogens often result in the higher acidity of these compounds by stabilizing the negative charge of the conjugate base. Exposure to such disinfection by-products in drinking water has been associated with a number of health outcomes by epidemiological studies, although the putative agent in such studies has not been identified. Hypochlorites Hypochlorites are calcium or sodium salts of hypochlorous acid and are supplied either dry or in liquid form (as, for instance, in commercial bleach). The same residuals are obtained as with gas chlorine, but the effect on the pH of the treated water is different. Hypochlorite compounds contain an excess of alkali and tend to raise the pH of the water. Calcium hypochlorite tablets are the predominant form in use in the United States for swimming pools. Pound-for-pound of available chlorine, hypochlorite compounds have oxidizing powers equal to gas chlorine and can be employed for the same purposes in water treatment. Gas chlorination requires a larger initial investment for feed equipment than what is needed for hypochlorite compounds. Calcium hypochlorite materials used in the water industry are chemically different from those materials variously marketed for many years as bleaching powder, chloride of lime, or chlorinated lime.

Make sure the take needles off syringes; do not break or bend child stays away from the cat’s litter box and any needles order 35 mg fosamax overnight delivery. He or she will sleep more and be harder into the appropriate container and immediately to waken cheap fosamax 35mg without prescription. The patient will lose bladder and soapy water and then call the doctor or a hospi- bowel control and may require a catheter and tal emergency room and ask what you need to require frequent cleanups buy 70mg fosamax amex. He or • Get rid of all liquid waste that has blood in it by she may experience trouble seeing and hearing. All items that cannot He or she may stop eating and drinking, so you be flushed—sanitary pads, paper towels, dress- will need to wipe his or her mouth with a wet ings and bandages, diapers, and so on—should cloth frequently and apply lip moisturizer. Breathing can care professionals where you should dispose of become noisy; that can be helped by putting these. Call the doctor if the patient’s breathing • If you see signs of dementia (short attention becomes irregular or if it appears that he or she span; trouble with speaking, moving, and think- stops breathing for a minute. Abstinence is taught in if taught voluntarily, teachers have no state-spe- character education. If taught voluntarily, must teach abstinence and localities teach contraception, they must include contraception. The following states have no spe- ease, for which minors may consent to testing cific rulings in regard to this right: Alaska, Arizona, and treatment. Indiana, Massachusetts, Nebraska, South Dakota, Iowa: Law explicitly authorizes minor to consent Utah, West Virginia, and Wisconsin. Connecticut: Law explicitly authorizes minor to Minnesota: Doctor may notify parents. Ohio: Law explicitly authorizes minor to consent to Vermont: Minor must be at least 12. Health services The Kaiser Family Foundation State Health Facts Online may be provided to minors of any age without (http://statehealthfacts. Data Source: Alan parental consent when the provider believes the Guttmacher Institute, January 2003 (available at services are necessary. After intercourse, they may note a fish- • About 104,000 children fall prey to sexual abuse like odor. Two dozen studies spotlight the discharge, vaginal discharge that has a fishy odor if fact that about 80 percent of gay men and les- a drop is placed in 10 percent potassium hydroxide. Women who are doctor can prescribe oral fluconazole (Diflucan) not pregnant can use topical or oral metronidazole pill. Take all of the antimicrobial medicine pre- latex of condoms and, thus, make them ineffective scribed. Other signs include fever, there is a possibility of pelvic inflammatory disease, headaches, malaise, and swollen lymph nodes in which can lead to infertility or an ectopic preg- the groin. Areas that chancroid can affect are the vulva, vagina, cervix, urethra, penis, and anus. Frequently candidiasis can be diag- Consistent use of latex condoms and barriers (den- nosed by physical exam alone. Then some men and women have an abnor- dia may lead to inflammation of the urethra and mal yellowish genital discharge and burning epididymis. A woman may have pain dur- tum, inflamed eye lining, and trachoma—the most ing intercourse, a red and swollen cervix, and common preventable cause of blindness. This disease is not con- Usually none, but fever, fatigue, and swollen tracted from contact with toilet seats, towels, and lymph glands are possible. It is often Physical exam and a swab of the vagina or penis to found in semen and cervical secretions. Urine testing is transmitted from mother to infant via breast- also used sometimes. Do Certain antiviral drugs (ganciclovir, foscarnet, and not have sex until a follow-up test confirms that cidofovir) are helpful. Consistently use condoms has genital herpes, according to the Centers for Dis- and barriers (dental dams). This can mean serious complica- tions at birth or later in life (such as mental (and do) spread genital herpes unknowingly. A that usually show up within 80 days of exposure female may have itching or burning in her vagina, and slough into ulcers. The ulcers can be seen in pain, vaginal discharge, and tiny red bumps or blis- the mouth or genital or anal areas. They are dark ters in the genital area, which turn into painful red and large and often enlarge; the affected skin ulcers. All of your sex partners should take tle signs are irritation around the anus, small skin antibiotics for donovanosis even if they are symp- slits, and skin redness. Anyone you have had sexual contact takenly think he has jock itch, acne, or irritation with in a 60-day time frame before your dono- caused by sexual activity. You also may have perma- ing feeling in the legs—signal that herpes is in an nent scarring of the urethra or other areas. If you use long-term suppres- Most people get genital herpes when a partner has sive medication therapy, you will probably reduce no visible symptoms. An infant in the valacyclovir (Valtrex) control outbreaks and mini- birth canal who has direct contact with herpes mize discomfort of outbreaks. Infection symptoms and work especially well when taken in a mother who has viral shedding at the time of within 24 hours of onset of symptoms. A person delivery can cause serious damage to her baby, with genital herpes can choose either suppressive especially if she has only recently acquired the or episodic antiviral treatments that can help pre- infection. In some During pregnancy, a woman who has had her- cases, suppressive antiviral therapy tends to pes for a long time transmits protective antibod- decrease the risk of transmission as well. Abstinence (no sexual activity at all) is the only If you are pregnant and have a sex partner who surefire way to prevent getting genital herpes. If has herpes, use condoms throughout the nine you are sexually active, use condoms and barriers months and do not have intercourse at all the last (dental dams), but be aware that these should not trimester. If you are in your last months of preg- be viewed as guarantees that you will not contract nancy, avoid all forms of sex with a partner whose this disease. Using latex condoms provides some infection status is unknown or one you know has protection, but not 100 percent, because viral shed- oral or genital herpes. Contact with a toilet seat or nata, genital warts are caused by human papillo- hot tub is very unlikely to spread the virus. Do not have oral sex with someone who has About three weeks to three months after exposure, oral herpes lesions. If you have herpes, even after genital warts appear as small painless bumps on sores are healed, wait several days before having the penis, scrotum, anus, or vaginal area. Use condoms between Untreated, these can develop into larger cauliflow- 274 The Encyclopedia of Sexually Transmitted Diseases erlike growths. Occasionally genital warts occur in aware, however, that a condom definitely cannot the mouth, after oral sex with an infected person.