8. You may have heard that drinking soda or acid is bad for your teet.pdf

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8. You may have heard that drinking soda or acid is bad for your teeth. The enamel on your teeth consists of the mineral hydroxyapatite, Ca (PO(OH) a. Is hydroxyapatite an acid or base? Hint: look at the ions in the chemical formula. b. Based on your answer to Sa, is acid good or bad for your teeth? Give reasons c. How does flouride prevent cavities? Hint: Fluoride reacts with hydroxyapatite in a double : 40 with acid. Solution Ans A. It is acidic since n sloution produces phosphate ion . Ans B. No it is not good, since it increase the production of Lactic acid and bacteria lives ore. Ans C. It is called remineralization. When fluoride is present during remineralization, the minerals fabriacted into the tooth enamel help strengthen teeth and prevent dissolution during the next demineralization phase. In this way, fluoride helps stop the decay process and prevent tooth decay.

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Contents Definition Purposes Ingredients Types of toothpaste How to choose a toothpaste? Toxic components of a toothpaste Caution on toothpaste usage Definition A toothpaste or dentifrice is a substance used with a toothbrush for the purpose of cleaning the accessible surfaces of the teeth. Toothpaste Ingredients Different types of Toothpastes ANTI-CARIES AGENTS Fluoride: considered to be the most effective caries-inhibiting agent, and almost all toothpastes today contain fluoride in one form or the other The most common form is sodium fluoride (NaF), but mono-fluoro-phosphate (MFP) and stannous fluoride (SnF) are also used Fluoride is most beneficial when the mouth is not rinsed with water after tooth brushing. In this way a bigger amount of fluoride is retained in the oral cavity How do teeth decay? Tooth decay begins when the outer surface of the tooth is attacked by acid. The acid is produced by bacteria which live on the surfaces of the teeth as a layer called plaque. When foods or drinks containing sugars enter the mouth, the bacteria within the plaque rapidly converts the sugars into acid. The plaque can hold the acid in contact with the tooth surface for up to 2 hours before it is neutralized by saliva. During the time that the plaque is acidic, some of the calcium and phosphate minerals, of which enamel is largely composed, are dissolved out of the enamel into the plaque. This process is called demineralisation. Fluoride: There are three main theories considering the positive action of fluoride in the prevention of caries: Positive action of fluoride in the prevention of caries: the most important anti-caries effect is claimed to be due to the formation of calcium fluoride (CaF2) in plaque and on the enamel surface during and after rinsing or brushing with fluoride. CaF2 serves as a fluoride reservoir. When the pH drops, fluoride and calcium are released into the plaque fluid. Fluoride diffuses with the acid from plaque into the enamel pores and forms fluoroapatite (FAP). FAP incorporated in the enamel surface is more resistant to a subsequent acid attack. Mouthwashes A mouthwash is defined as a non-sterile aqueous solution used mostly for its deodorant, refreshing or antiseptic effect. Mouthwashes or rinses are designed to reduce oral bacteria, remove food particles, temporary reduce bad breathe and provide a pleasant taste. Mouth rinses are generally classified as either cosmetic or therapeutic or a combination of the two. Mouthwashes Therapeutic rinses often have the benefits of their cosmetic counterparts, but also contain an added active ingredient, f. ex. fluoride or chlorhexidine, that help protect against some oral diseases.

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Genetic evidence supports which of the following explanations for the presence of 13 different finch species on the Galapagos islands? Each of the 13 species was founded by an independent migration of a different species from the mainland to the islands. Many years ago, more than 13 different species of birds migrated to the islands. The current 13 finch species are the only ones that survived. It\'s not clear based on the DNA evidence whether the 13 species arose from a single migration of one species or multiple migrations of several species from the mainland to the islands. Many years ago, a small population of single finch species migrated to the islands and evolved into the current 13 species. Solution Answer will be 4th option that is \"many year ago, a small population of single finch species migrwted yo the islands snd evolver into current 13 species. The evolution of finch was related to feeding strategies. The 13 diatinct species were descendants of a common ancestor and each of their species eats different type of food. for example, Cactus finch has a long beak that reaches into blossoms, the gtound finch has a short beak adapted for eating seeds burried under the soil and tree finch has a parrot shaped beak suited for stripping bark to find insects. The beak size is clearly related to feeding strategies, it is also related to reproduction. Female finch tends to mate with males that have the same beak size..

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Evolution is driven by environmental that put selection pressure on organisms. a. What environments lead to the development of an \'open\' pan-genome? What conditions lead to a \'closed\' pan-genome? b. Why do bacteria of a single species have genes that other members of the same species do not? Solution Pan genome is the entire set of genes of all the strains of a species it includes genes present in all the strains and the dreams present only in some strains. Pan genome can be defined as open or closed based on the capability of the species to acquire exogenous DNA and to possess large amount of rRNA. These species with open pangenome tend to have large genome and contain open genes where there is high rate of genes transfer and several ribosomal Operon. Some bacterial species may have unlimited large genes repertoire or open pangenome and other species may have limited by maximum number of genes in their gene pool called closed pangenome. In open Pan genome species the number of genes of The species increases with the number of additionally sequence d strrains species which live in multiple environment of different microbial communities have chances for exchanging genetic material and hence continuously changed a set of genes example E.coli. In closed pangenome after some sequenced strains additional strains don\'t provide new genes to the species this pangenome is typical for species that live in isolated niches with Limited access to global microbial genen pool example bacillus anthracis. B. For example different strains of the pathogen pseudomonas syringae have different host range and their remarkably have different genomes due to differences in the virulence genes in their genomes. The ecological niche determines the evolution of the gene content of an organism that for the largest genomic differences observed among the strains of a species could be the outcome of Differential evolution of those species in response to different ecological habitats..

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e) As a practical matter, trade-offs of qualitative characteristics occur in accounting because Accounting standards are incomplete Accountants don\'t have enough time to properly investigate all matters Managers can\'t be trusted Specific disclosures may not meet all users\' needs f) Which of the following is a key difference between IFRS and ASPE? IFRS includes the concept of conservatism IFRS includes four principle qualitative characteristics Timeliness is considered an enhancing characteristic in IFRS O ASPE describes three different types of capital maintenance g) Which of the following is not a measurement base recognized in the conceptual framework? Historical cost O Present value Current cost Fair market value h) The standard setters\' discussion of financial statement elements Requires transactions be reported in accordance with their legal form Includes all items that should be reported on a financial statement Eliminates the need for the accountant to apply professional judgment Includes broad definitions of the general nature of each item i) Which of the following is not a motivation for management manipulation of reported financial results? Conditions of contracts Academic disagreement Performance-based compensation Market expectations j) Which of the following criteria is not a requirement for recognition of an item in the financial statements? The item has a cost or value that can be measured reliably The fair value of the item can be determined through an active market O It is probable that future economic benefits from the item will flow to or from the entity The item meets the definition of an element Solution 1. Specific disclosures may not meet all users need. 2. IFRS includes the concept of conservatism 3. Present Value. 4. Requires transactions be reported according to legal form.

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Define the role of the entrepreneur in the U.S. economy and describe the entrepreneurial profile. Solution Irrespective of economy, the entrepreneur plays an equally important role in all economies. Entrepreneurs can come in different shapes and sizes. On one hand, we can have an entrepreneur like Peter Thiel founder of Paypal and an early investor in Facebook and on other hand, we can have thousands ( or millions ) of entrepreneur who are running mom and pop stores, fuel stations and motels. Entrepreneurs play following important role in any economy ( including US economy): 1. Job Creators: It is not the established businesses which plays a larger role in creating jobs. Its the new business and the small and medium enterprises which generates the maximum jobs. 2. Brings efficiency to the system: A new venture by an entrepreneur is nimble, identifies new but unmet needs or serve the existing needs more efficiently. The competition keeps everyone nimbles, weeds out inefficient firms and brings overall larger value to the system. 3. Market disrupters: While new entrepreneurs go for new technology or for new businesses, new job opportunities emerge. Who would have thought that positions like Data scientists, Viral marketers, E commerce, Hyper retail would have existed two and half decades before. Entrepreneurial Profile: As mentioned above , entrepreneurs can come in various shapes and sizes. Its not necessary for an entrepreneur to be a white, male, caucasian and from Bay area. Anyone who is the owner of a business is an entrepreneur. It is another matter that today entrepreneurship is more identifed with IT, however, entrepreneurship can be in any field ranging from tech to mining, retailing to space journeys. An entrepreneur is one who (1) is not status quoist and is in constant search for new ways to make existing things better, efficient and cost effective (2) who challenges exisiting norms and ways in which the world is seen (3) a risk taker and someone who is willing to stick his neck out..

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Consider a double-linked linked list implementation with the following node: struct Node {int data; Node *prev; Node *next;} Write a copyList method that is not a member of any class. The method should take a head pointer and return another pointer. Do not modify the input. Solution struct Node { Node *prev; // previous node Node *next; // next node int data; // stored value }; #include #include \"List.h\" // std: #include using namespace std; typedef DataList ; // std: typedef list Data; int main() { Data k; // back stuff k.push_back(5); k.push_back(6); cout << k.back() << endl; k.pop_back(); // front stuff k.push_front(4); k.push_front(3); cout << k.front() << endl; k.pop_front(); // forward iterator Data::iterator pos; for (pos = k.begin(); pos != k.end(); ++pos) cout << *pos << endl; // output and delete list while (!k.empty()) { cout << k.front() << endl; k.pop_front(); } k.push_front(5); k.push_front(6); // remove and erase k.remove(5); pos = k.begin(); k.erase(pos); k.push_front(5); k.push_front(6); // copy constructor Data l = k; // assignment operator Data m; m = k; return 0; } // List.h struct Node; classIterator List; class List { public: typedef ListIterator iterator; // constructor List(); // destructor virtual ~List(); // copy constructor List(const List& k); // assignment operator List& operator=(const List& k); // insert value in front of list void push_front(double data); // insert value in back of list void push_back(double data); // delete value from front of list void pop_front(); // delete value from back of list void pop_back(); // return value on front of list double front() const; // return value on back of list double back() const; // delete value specified by iterator void erase(const iterator& i); // delete all nodes with specified value void remove(double data); // return true if list is empty bool empty() const; // return reference to first element in list iterator begin() const; // return reference to one past last element in list iterator end() const; private: Node *head; // head of list }; class ListIterator { public: // default constructor ListIterator() { i = 0; } // construct iterator for given pointer (used for begin/end) ListIterator(Node *p) { i = p; } // convert iterator to Node* operator Node*() const { return i; } // test two iterators for not equal bool operator!=(const ListIterator& k) const { return i != k.i; } // preincrement operator ListIterator& operator++() { i = i->next; return *this; } // return value associated with iterator double& operator*() const { return i->data; } private: Node *i; // current value of iterator }; list.cpp // delete list static void deleteList(Node *head) { Node *p = head->next; while (p != head) { Node *next = p->next; delete p; p = next; } delete head; } // copy list static void copyList(const Node *from, Node *&to) { // create dummy header to = new Node; to->next = to->prev = to; // copy nodes for (Node *p = from->next; p != from; p = p->next) { Node *t = new Node; t.

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alter ego theory. TRUE FALSE Multiple Choice: her nephew Dru to manage her business, Door\'s Doors. In addition based 21. Doreen hires to his salary, Doreen provides Dru with health insurance, a 401K, and a bonus on a formula for sharing the profits. Dru is a. a partner because he shares in the profits. b. not a partner because he does not share in the losses c. not a partner because he is family and nepotism is against the law. d a partner because he is family and with a good lawyer could convince a jury that Door\'s Doors is a family business. 22. Debra and Lawrence have an equal partnership. This year, after expenses, the partnership had a profit of $200,000. Debra and Lawrence will each pay taxes on: a. whatever they receive from the partnership. b. $50,000. c. $100,000. d. None of the above. The partnership itself will pay the taxes on the business\'s profit 3. Pualani and Quentin do business as partners in Rio Vista Builders, a residen Solution 21. Answer is option B Partners are required to share profit and loss in partnership 22. Answer is option C IRS does not consider partnerships to be separate from their owners for tax purposes; instead, they are considered “pass-through” tax entities. So partnership income of 200,000 will be equally distributed between both partners equally . Income of each partner will be 100,000..

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/* *Your name *Date * *Explanation of Program *-Modifying the first program * - print,printf, escape values, arithmetic operators */ public class Welcome1 { //main method begins execution f Java application public static void main (String [] args) { System.out.println(\"Welcome to Java Programming\"); }//end method mai }//end class Welcome1 /* Output copied from display/message windowo * ----jGRASP exec: java Welcome1 *Welcom to Java Programming * *----jGRASP: operation complete. */ in JAVA Please edit this program in Java using new commands Solution Using the following commands you can print the output in java: System.out.write(\"Message Here\".getBytes()); System.out.format(\"%s\", \"Message Here\"); PrintStream ot = new PrintStream(new FileOutputStream(FileDescriptor.out)); ot.print(\"i love Java\"); System.err.print(\"Message Here\");.

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Why is it that ozone is not desirable at the surface of earth, but is desirable in the stratosphere? Solution Ozone occurs naturally in the stratosphere and is produced and destroyed at a constant rate. But this \"good\" ozone is gradually being destroyed by manmade chemicals called chlorofluorocarbons (CFCs), halons, and other ozone depleting substances (used in coolants, foaming agents, fire extinguishers, and solvents). These ozone depleting substances degrade slowly and can remain intact for many years as they move through the troposphere until they reach the stratosphere. There they are broken down by the intensity of the sun\'s ultraviolet rays and release chlorine and bromine molecules, which destroy \"good\" ozone. One chlorine or bromine molecule can destroy 100,000 ozone molecules, causing ozone to disappear much faster than nature can replace it. It can take years for ozone depleting chemicals to reach the stratosphere, and even though we have reduced or eliminated the use of many CFCs, their impact from years past is just starting to affect the ozone layer. Substances released into the air today will contribute to ozone destruction well into the future. Satellite observations indicate a world-wide thinning of the protective ozone layer. The most noticeable losses occur over the North and South Poles because ozone depletion accelerates in extremely cold weather conditions..

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Which ape has been known to make territory patrols and \"wage war\" on neighboring groups? Orangutans Gorillas Chimpanzees Bonobos Which group was the first euprimates? Omomyids and Adapids and plesiadaiforms Plesidapiforms and Omomyids Adapids Solution Ans 21 c chimpanzees Not only human, chimpanzees also wage wars on their neighbouring groups and make territories. The gombe chimpanzee war lasted 1974- 1978 . So it was the first time in 1974 when they were seen attacking their fellow mates..

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