Penguin Facts

Penguin Facts Penguins (Aptenodytes, Eudyptes, Eudyptula Pygoscelis, Spheniscus, and Megadyptes species, all in the Spheniscidae family) are perennially popular birds: chubby, tuxedo-clad creatures that waddle charmingly across the rocks and ice floes and belly flop into the sea. They are native to oceans in the southern hemisphere and in the Galapagos Islands. Fast Facts: Penguins Scientific Name: Aptenodytes, Eudyptes, Eudyptula Pygoscelis, Spheniscus, MegadyptesCommon Name: PenguinBasic Animal Group: Bird  Ã‚  Size: range from 17–48 inchesWeight: 3.3–30 poundsLifespan: 6–30 yearsDiet:  CarnivoreHabitat: Oceans in the southern hemisphere and the Galapagos IslandsConservation Status: Five species are listed as Endangered, five are Vulnerable, three are Near Threatened. Description Penguins are birds, and although they may not look like our other feathered friends, they are, indeed, feathered. Because they spend so much of their lives in the water, they keep their feathers slicked down and waterproofed. Penguins have a special oil gland, called a preen gland, that produces a steady supply of waterproofing oil. A penguin uses its beak to apply the substance to its feathers regularly. Their oiled feathers help keep them warm in the frigid waters, and also reduce drag when theyre swimming. Although penguins have wings, they cant fly at all. Their wings are flattened and tapered and look and function more like dolphin fins than bird wings. Penguins are efficient divers and swimmers, built like torpedoes, with wings designed for propelling their bodies through the water instead of air. Of all the recognized species of penguins, the largest is the Emperor penguin (Aptenodytes forsteri), which can grow to four feet in height and 50–100 pounds in weight. The smallest is the little penguin (Eudyptula minor) which grows to an average 17 inches in length and weighs about 3.3 pounds. Jurgen Christine Sohns/Getty Images Habitat Dont travel to Alaska if youre looking for penguins. There are 19 described species of penguins on the planet, and all but one of them lives below the equator. Despite the common misconception that all penguins live among the icebergs of the Antarctic, thats not true, either. Penguins live on every continent in the Southern Hemisphere, including Africa, South America, and Australia. Most inhabit islands where they arent threatened by large predators. The only species that lives north of the equator is the Galapagos penguin (Spheniscus mendiculus), which, in line with its name, resides in the Galapagos Islands. Diet Most penguins feed on whatever they manage to catch while swimming and diving. Theyll eat any marine creature they can catch and swallow: fish, crabs, shrimp, squid, octopus, or krill. Like other birds, penguins dont have teeth and cant chew their food. Instead, they have fleshy, backward-pointing spines inside their mouths, and they use these to guide their prey down their throats. An average-sized penguin eats two pounds of seafood per day during the summer months. Krill, a small marine crustacean, is a particularly important part of the diet for young penguin chicks. One long-term study of the diet of gentoo penguins found that breeding success was directly related to how much krill they ate. Penguin parents forage for krill and fish at sea and then travel back to their chicks on land to regurgitate the food into their mouths. Macaroni penguins (Eudyptes chrysolphus) are specialist feeders; they depend on krill alone for their nutrition. Ger Bosma/Getty Images Behavior Most penguins swim between 4–7 mph underwater, but the zippy gentoo penguin (Pygoscelis papua) can propel itself through the water at 22 mph. Penguins can dive hundreds of feet deep, and stay submerged for as long as 20 minutes. And they can launch themselves out of the water like porpoises to avoid predators below the surface or to return to the surface of the ice. Birds have hollow bones so theyre lighter in the air, but a penguins bones are thicker and heavier. Just as a SCUBA divers use weights to control their buoyancy, a penguin relies on its beefier bones to counteract its tendency to float. When they need to make a quick escape from the water, penguins release air bubbles trapped between their feathers to instantly decrease drag and increase speed. Their bodies are streamlined for speed in the water. Reproduction and Offspring Nearly all penguin species practice monogamy, meaning a male and female mate exclusively with each other for the breeding season. Some even remain partners for life. The male penguin usually finds itself a nice nesting site before attempting to court a female. Most species produce two eggs at a time, but emperor penguins (Aptenodytes forsteri, the largest of all the penguins) raise just one chick at a time. The emperor penguin male takes sole responsibility for keeping their egg warm by holding it on his feet and under his folds of fat, while the female journeys to the sea for food. Penguin eggs are incubated between 65 and 75 days, and when they are ready to hatch, the chicks use their beaks to break the shell, a process which can take up to three days. Chicks  weigh about 5–7 ounces at birth.  When chicks are small, one adult remains with the nest while the other forages. The parent tends to the chicks, keeping them warm until their feathers develop in about 2 months, and feeding them regurgitated food, a period which varies between 55 and 120 days. Penguins reach sexual maturity between three and eight years of age. Sylvain Cordie/Getty Images Conservation Status Five species of penguins are already classified as endangered (Yellow-eyed, Galapagos, Erect Crested, African, and Northern Rockhopper), and most of the remaining species are vulnerable or near threatened, according to the International Union for Conservation of Natures Red List. The African penguin (Spheniscus demersus) is the most endangered species on the list.   Threats Scientists warn that penguins worldwide are threatened by climate change, and some species may soon disappear. Penguins rely on food sources that are sensitive to changes in ocean temperatures, and dependent on polar ice. As the planet warms, the sea ice melting season lasts longer, impacting krill populations and penguin habitat. Sources Barbraud, Christophe, and Henri Weimerskirch. Emperor Penguins and Climate Change. Nature 411.6834 (2001): 183–86. Print.BirdLife International. Spheniscus demersus. The IUCN Red List of Threatened Species: e.T22697810A132604504, 2018.Bradford, Alina. Penguin Facts: Species Habitat. Live Science, September 22, 2014.Cole, Theresa L., et al. Ancient DNA of Crested Penguins: Testing for Temporal Genetic Shifts in the World’s Most Diverse Penguin Clade. Molecular Phylogenetics and Evolution 131 (2019): 72–79. Print.Davis, Lloyd S. and John T. Darby (eds.). Penguin Biology. London: Elsevier, 2012.  Elliott, Kyle H., et al. High Flight Costs, but Low Dive Costs, in Auks Support the Biomechanical Hypothesis for Flightlessness in Penguins. Proceedings of the National Academy of Sciences 110.23 (2013): 9380–84. Print.Lynch, Heather J., William F. Fagan, and Ron Naveen. Population Trends and Reproductive Success at a Frequently Visited Penguin Colony on the Weste rn Antarctic Peninsula. Polar Biology 33.4 (2010): 493–503. Print. Lynch, H. J., and M. A. LaRue. First Global Census of the Adà ©lie Penguin. The Auk: Ornithological Advances 131.4 (2014): 457–66. Print.Species Profile for African penguin (Spheniscus demersus). ECOS Environmental Conservation Online System, 2010.Threats to Penguins, Defenders of Wildlife.Waluda, Claire M., et al. Long-Term Variability in the Diet and Reproductive Performance of Penguins at Bird Island, South Georgia. Marine Biology 164.3 (2017): 39. Print.Waters, Hannah. 14 Fun Facts About Penguins. Smithsonian, April 25, 2013.

Kaplan MCAT Courses

Kaplan MCAT Courses If youve set your sights on mastering the MCAT before you register, then you know youll need to prepare for it with practice tests, books, apps, tutoring or MCAT courses. If taking a class has been on your mind, then youre in the right spot. Many test prep companies out there offer MCAT courses to help you master the skills, testing techniques and knowledge youll need for test day. Kaplan is one of those companies, but their programs are top-notch and their reputation is typically outstanding. Heres what Kaplan has to offer. Kaplan MCAT Courses Kaplan Test Prep is the largest test prep company out there, and with its size comes great products and test prep materials. The MCAT course options listed below, taught by one of Kaplans trained teachers, all come complete with the Kaplan Higher Score Guarantee: If youre not ready to take the MCAT, you can study with Kaplan again for free. Or, if for any reason youre dissatisfied with your score gain, you can study again for free. And, if you dont score higher on the MCAT at all, you can study with Kaplan for free or get your money back. MCAT Classroom: On Site The Kaplan On Site MCAT course is just as it states: youll take your classes in an actual classroom with an actual Kaplan teacher. Why is this good? Personal attention, of course, with an interactive setting. The classes and times will vary according to your exact location, but I typed in my zip code, and found nine classes available for enrollment in less than 15 miles from my location. At press time the cost was $1,999 or three payments of $666.33 Whats Included: 11,000 practice questions, in addition to MCAT Qbank custom quizzes19 full-length exams11 supplemental lessons online, with a live teacherOver 200 hours of MCAT instructionAccess to all AAMC exams, including the Self Assessment PackageA Mobile-enabled and optimized syllabus in MCAT prep MCAT Classroom: Anywhere The Kaplan Anywhere MCAT course is   for those of you whod like a teacher, but dont have the time to travel to a physical classroom. The classes are live, so you will have to boot up the old computer at a certain time to take the course, but there are literally scores of options for class times and days since you arent restricted to your zip code. At press time the cost was $1,999 or three payments of $666.33 Whats Included: 25 live, online classroom sessions led by expert instructors11,000 practice questions, in addition to MCAT Qbank custom quizzes19 full-length exams130 additional hours of on-demand video instructionAccess to all AAMC exams, including the Self Assessment Package MCAT On Demand The Kaplan On Demand MCAT course is designed for people with hectic schedules, who need to cram in some prep time whenever they can. Its available 24/7 because the lectures are not live like the Anywhere and On Site MCAT courses – theyre recorded. Watch them whenever youd like, as often as youd like, for as long as youd like. Pause and start over if you need to or watch the entire lecture again and again. At press time the cost was $1,833 or three payments of $633.00 Whats Included: 25 core lessons- and over 130 hours of total instruction-led by expert instructors11,000 practice questions and custom quizzes with Kaplans MCAT Qbank19 full-length examsAccess to all AAMC exams, including the Self Assessment Package Signing Up for Kaplans MCAT Courses If you like what you see with Kaplans MCAT courses, you can call 1-800-KAP-TEST to enroll, or you can head to Kaplans website to check availability and sign up online.

Discuss the activity in the laboratory that are designed to assure Assignment

Discuss the activity in the laboratory that are designed to assure Quality (Collection of specimen - Reporting ) - Assignment Example It is also important to collect the specimen with sterile instruments while preventing the specimen from coming into contact with any disinfectants (Stokes & Ridgeway 1980, p10). These precautions prevent the specimen from becoming contaminated while avoiding killing off any pathogens in the specimen. Lastly, there are specific procedures to be followed depending on the type of specimen being collected. Proper collection of specimens ensures that laboratory testing is accurate and safe. Once a specimen reaches the laboratory, thorough records must be kept for quality assurance and accuracy. It is especially important that care "should be taken to prevent reporting results on the wrong specimen and transposing digits in reporting quantitative data" (Kumari & Bhatia 2003, p160). The records must be detailed enough to determine any possible sources of error during testing. Keeping detailed and accurate records is essential for quality

Have technological developments undermined the truthful nature of Essay

Have technological developments undermined the truthful nature of photography or have they provided new creative possibilities - Essay Example In its earliest forms, due perhaps in large part to the fact that exposure times were lengthy as the technology was in its infancy, photography was used as a narrative form, but even this early in its history, technological developments were allowing for more creative expression than simply recording the ‘truthful’ image. â€Å"At the turn of the century [1900], a small group of serious photographers tried to rescue the art form from its low estate by turning their backs on the more blatant forms of narrative photography and its continued reliance on and subservience to painting. They sought a more independent poetic vision based on the camera lens and motivated by a concern with contemporary forms† (Brown, 1971: 31). Thus, while it might be said that â€Å"The new malleability of the image may eventually lead to a profound undermining of photography’s status as an inherently truthful pictorial form† (Ritchin, 1990: 28), the new technological develop ments offered to photography are merely the latest in a long line of photographic tools that can be used to explore new creative possibilities and/or provide truthful representation, based upon the decisions made by the photographer. At no point in its history can photography be said to have been limited to merely ‘true’ forms of capturing images. To understand this, it is first necessary to understand how the development of the digital camera is similar to the early development of the traditional camera and then to take a look at how each works to produce images which can be manipulated in various ways to arrive at an idea of ‘truth’. There is no doubt that the boom of available digital cameras and their immediate integration with desktop computers and other devices has been revolutionizing the photography industry. There are many physical advantages to going digital over more traditional methods. Although

The multiple emulsions

The multiple emulsions Introduction: Seifriz started his pioneering work about multiple emulsions since 1925, which is regarded as the fundamental knowledge in the later research. Multiple emulsions are complicated systems which are considered as emulsions of emulsions (Garti, 1996).In the outer continues phase, the droplets of the dispersed phase named as globules which contain even smaller dispersed droplets ,the globules are separated from each other in external continues phase by a layer of oil phase film. In the inner phase, the droplets are departed from each other by oil phase (Benichou et al. 2006). It is widely believed that there exist two primary types of multiple emulsions, one is water-in-oil-in-water (W1/O/W2) emulsions that an w/o emulsion is dispersed in another aqueous phase (W2) and the other is oil-in-water-in-oil (O1/W/O2) emulsions that an o/w emulsion is dispersed in another oil phase(O2). In the previous study, water-in-oil-in-water (W1/O/W2) multiple emulsions have accounted for a vital role in t he research of multiple emulsions , because the applications of W1/O/W2 multiple emulsions plays an important role in the food industry and it is also easier for us to select various of hydrophilic emulsifiers which are safe to health as stabilizers in preparation of multiple emulsions (Pays et al., 2002). As shown in Fig. 1, take water-in-oil-in-water (W1/O/W2) double emulsions as an example, which are composed of three distinct phases : an internal aqueous phase (W1), which containing many aqueous soluble ingredients. Various internal aqueous droplets are encapsulated in an oil phase (O), which is included in external aqueous phase (W2) (Garti, 1996). Applications of multiple emulsions It is widely believed that the potential applications so numerous that the research in such promising area can bring beneficial effects, especially in products areas ,such as drug-delivery systems, cosmetics, and foods . Water-in-oil-in-water (W1/O/W2) emulsions allow the encapsulation of active ingredients which have the ability to be soluble in the internal aqueous phase, thus it is possible to hide smell of some matter; remove toxic substance; or select appropriate conditions to realize controlled release of the active ingredients under certain process of emulsification. (Kanouni et al. 2002) On the basic of slow and sustained release of active ingredients from an internal reservoir into the external aqueous phase, the main function of double emulsions is regarded as an internal reservoir to entrap ingredients whatever you choose into the inner confined space, in order to protect against oxidation, light and enzymatic degradation. As a result, sensitive and active molecules can be protected from the external phase by the function of internal reservoir. In addition, because of the phenomenon of release of water or ingredients which can be observed in the experiments, the active ingredients will exist partly in the internal aqueous phase, partly in the oil phase and occasionally in the external phase(Benichou et al. 2004) .In the food industry, double emulsions provide some advantages because of their capability to encapsulate some water-soluble substances, such as flavours or active ingredients which are then slowly released from the internal compartments. Additionally, we should select food-grade additives which is soluble in the internal aqueous phase because the consumer products in food industry will be applied in our daily lives. Furthermore, as the development of needs in food quality, the production of low calorie and reduced fat products come into food market. (Muschiolik, 2007; Van der Graaf et al., 2005). In agrochemical industry, it has become incr easingly difficult for scientists to produce products, such as pesticides which are effectively and simultaneously friendly to the environment. According to ElShafei et al. (2009), the idea of multiple emulsions has been successfully applied to the agriculture products and the multiple emulsions are relatively stable even on storage at room temperature and 4 ?for 30 days. As government increasingly pay attention to the safe and environmentally friendly products, the research in this orientation has draw publics attention. Till now, no pharmaceutical multiple emulsions have been brought to the market, because potential emulsifiers used in multiple emulsions are only available in cosmetic grade but not be applied in pharmaceutical grade. (Schmidts et al., 2009 ) In cosmetic area, the possibility of combining incompatible substances in products in order to offer more favorable functions. (Vasiljevic et al., 2005) multiple emulsions also have the potential to change the commonly oily feel of hand-cream to aqueous texture. The advance of products of cosmetics has brought out more space to develop in order to get more profits. (Kanouni et al., 2002) Methods of preparation: Scientists have done some research in multiple emulsions as the applications provide us more convenience and bring better consumer products in many areas. Because double emulsions have more complex structure and are even more thermodynamically unstable than single emulsions, they prone to be difficult to prepare, especially on an industrial scale. The difficulties of preparation of multiple emulsions have draw scientists attention, so many research have been pour into this area. In general, there exist single -step and two -step emulsification methods to prepare multiple emulsions (Allouche et al., 2003). Due to a multiple emulsion is considered as a mesophase between O/W and W/O emulsion, the one-step method of preparation means a combination of the two different types of emulsions and surfactant phase, which is very difficult to control. So, such method will not be chosen in the preparation (Matsumoto, 1987; Mulley and marland, 1980). On the basic of previous study, the two-step emulsification process is considered as the most common and better controlled method. First of all, W1/O emulsions are much easier to prepare and it is also easy to control various characteristics in these emulsions as the parameters in them are relatively limited . Secondly, in the second step, it is widely believed that the complex structure and variable quantities result in relatively difficult to control or regulate. Many methods have been commonly used to improve the preparation of multiple emulsions, adding suitable emulsifiers is regarded as one of the most significant one. In general, two kinds of emulsifiers are introduced to add in the preparation of multiple emulsions as the difference of their functions. Because of the different affinity of the emulsifiers, hydrophobic emulsifier Emulsifier I which is used in the oil phase and hydrophilic emulsifier Emulsifier II which is used in the external aqueous phase (Garti, 1996). The hydrophobic emulsifier is designed to stabilize the interface of the W1/O internal emulsion and the hydrophilic emulsifier acts as stabilizer at the external interface of W1/O/W2 emulsion. The main function of emulsifiers is enhancing the stability of multiple emulsions in the preparation and even the long-time storage. The process of two-step preparation is shown in Fig.2. In the first step, the primary W/O emulsion is prepared under high-shear conditions (homogenization) to obtain small droplets, whereas the second step is carried out with less shear in order to avoid rupturing the internal droplets because the second step i s much difficult to control than the first step (van der Graaf et al., 2004). On the basic of Kanouni et al., (2002)s earlier work, in the first step, they usually use an Ultra-Turrax mixer with a relatively high speed to prepare a W1/O emulsion which is a combination of internal aqueous phase and an appropriate oil phase with suitable low HLB emulsifier; in the second step, the W1/O/W2 multiple emulsions will be produced by adding proper high HLB emulsifiers using Ultra-Turrax mixer or mechanical agitator with relatively smaller rotation speed. In the previous study, stirring apparatuses, rotor-stator systems and high pressure homogenizers are considered as the most commonly and conventional emulsification devices (Schubert and Armbruster, 1992).As shown in table 1. the functions and disadvantages has been tabulated. There are several drawbacks in such existing methods of production ( Williams et al.,1998). First of all, it is not easy for us to control the droplet size and droplet size distribution of the final multiple emulsions products. Secondly, it is difficult to scale up because different classes of the products are generated per batch on the same manufacture conditions, which contribute to one of the main factors why such products can not be applied in the industry. Moreover,van der Graaf et al. (2005) illustrate that conventional methods are not feasible in preparation of double emulsions, because high-shear stresses can result in rupture of the internal emulsions which should be avoided in the secondary emulsification (van der Graaf et al., 2005) Different kinds of emulsification devices can generate various multiple emulsions with different conditions, such as droplet size, encapsulation efficiency, release rate, and so on. What has interested the scientists most recently is researching novel approaches to improve the emulsification equipment in order to generate more stable and ideal multiple emulsions. Much attention has been put in the improvement of the second step by using various pieces of equipment and novel method. Nakashima et al. (1991) points out that membrane emulsification is widely accepted as one of the new method for the production of emulsions recently( Nakashima et al., 1991). This technique is increasingly attracted because of its low energy consumption, the better control of droplet size and droplet size distribution and especially the mildness of the process, especially suitable to be used in the second step to prevent rupture of the double emulsion droplets (van der Graaf et al., 2005). Joscelyne and Tragardh (1998) demonstrate that it is favourable to prepare small droplets when the conditions are higher concentrations of emulsifiers, high wall shear stress through a membrane with small pore size. As shown in Fig.3. because of the mild conditions in the process of membrane emulsification, it is easier to produce small size droplets and protect the multiple emulsions from membrane rupture, especially useful in the second step of emulsification. The system chosen ceramic membranes of different average pore size to prepare relative small droplets in multiple emulsions because such kinds of emulsions more stable. Membrane technology can be applied to the many productions, such as oil-in-water (O/W) emulsions t, UHT products and so on (Joscelyne and Tragardh 1998) .However, low flux of the dispersed phase is the main and visible drawback of membrane emulsification (Charcosset et al., 2004),which is caused by the properties of membranes with a low hydraulic . In general, two methods are commonly introduced in membrane emulsification: cross-flow membrane emulsification and pre-mix membrane emulsification (Suzuki et al., 1998). Take pre-mix membrane emulsification as an example, as shown in Fig.4. the most significant advantages of such method is it can provide high flux, which can improve the membrane emulsification process. Various novel methods have been reported to improve the disadvantage of membrane emulsification. (Gijsbertsen-Abrahamse et al., 2004) for example, with the advance in nano- and micro engineering, it is possible to produce membranes with a low hydraulic resistance named microsieves. (Van Rijn et al., 2005) Microsieves, inorganic membranes, which can offer a very thin selective layer, high controlled pore size and shape, and smooth surfaces. As shown in Fig.5., SEM images of pore morphology of a silicon nitride microsieve surface. Microsieve membranes contribute to flux decline in crossflow filtration of bovine serum albumin (BSA) solutions. (Giron`es et al.,2006) According to Shnji Sugiura et al., (2003), monodispersed multiple emulsions which are good at providing relatively stable conditions are regularly applied in industries and basic studies, on the basic of easier observation, monodispersed emulsions are regarded as an effective approach in determining the resistance to coalescence of an emulsion, and in observing how the active matter go through the oil film by diffusion. (Sugiura et al., 2003) Furthermore, a microfabricated channel array has been pointed out as a promising method for preparing monodisperse emulsion droplets (Kawakatsu et al., 1997). This type of emulsification technique is called microchannel (MC) emulsification, which is regarded as a novel method for preparing monodisperse emulsions. Owning to the advantages of this technique, it is a promising technique to improve the stability of multiple emulsions. (Kawakatsu et al., 2001; Sugiura et al., 2001 ). Nakagawa et al.(2004) suggest that monodisperse surfactant-free mic rocapsules can be produced by MC emulsification using gelatin. Of course, this technique need further study to improve its low production rate. Improvements in stability of multiple emulsions In practice, significant problems may arise, not only the thermodynamic instability of emulsions, but also many destabilization phenomenon, such as flocculation, coalescence and creaming, have contribute to the unstable emulsions (Vasiljevic et al., 2005). In order to protect the emulsions from the formation of flocculation or coalescence, two methods have been introduced to protect the droplets from each other, one is increasing viscosity of the external phase, the other is energy barrier. The DLVO theory is commonly applied to explain colloidal stability. when the distance between two colloid particles is increasing from small to large, the resulting potential is rage from negative to positive because the existence of attraction potential and repulsion potential ( Friberg, 1997). Various factors may have an effect on the stability of multiple emulsions, including the method of preparation, the oil type, type and concentration of the emulsifier and so on (Vasiljevic et ,al. 2005). On the basic of fundamentally experimental data, we choose the relatively suitable and effective conditions to prepare multiple emulsions. Many research have been put into how to improve the stability of multiple emulsions because thermodynamically unstable multiple emulsions not only exist in the process of preparation ,but also occur during storage or on exposure to environmental stresses such as mechanical forces, thermal processing, freezing or dehydration. On the basic of developed techniques, we can observe or measure the leakage of the inner aqueous phase(W1) in the outer phase and destabilization properties of the emulsions. There are four mechanisms explaining the instability of W1/O/W2 multiple emulsions: (1) the instability comes from the inner aqueous droplets because of coalescence; (2) the instability comes from the oil droplets because of coalescence; (3) rupture of the oil film (4) transport of water and ingredients through the oil layer (Appelqvist et al., 2007,; Florence and Whithill,1981; der Graaf et al., 2005). In the real conditions, there may exist more than one mechanism in the multiple emulsions, different results to different situations. The determining of primary mechanisms exist in certain multiple emulsions should dependent on the experimental data and convincing analysis. What should we do is research more reasonable methods to solve the problem of thermodynamically unstablity in multiple emulsions. Three kinds of approach aiming at improving stabilization and slow solute release have been list as follows (Davis et al., 1985) : (1) stabilization of the inner W1/O emulsion, for example, the addition of various emulsifier combinations (Apenten and Zhu, 1996; Shima et al., 2004; Su et al., 2006); (2) stabilization of oil phase by choosing suitable oil type and the addition of proper carriers, complexants and viscosity builders, for instance, the solidification of the oil phase and the modification of the solubility and polarity of the oil phase to make it less water soluble (Tedajo et al., 2001); (3) stabilization of the external aqueous phase, such as increasing the viscosity of the outer aqueous phase (-zer, et al., 2000). Although many strategies have been categorized above, a majority of them are not suitable to apply in food industry because they are not easily scaled up in industry or they include not food- grade ingredients entrapped in multiple emulsions, which may make a bad influence on human health. So, there exists numerous space for us to research in the methods of improving the stability of multiple emulsions. (ORegan and Mulvihill, 2009) In general, many factors contribute to the improvement of stability of multiple emulsions as some research have deeply determined the main causes of thermal unstable phenomenon and flocculation, coalescence and creaming phenomenon. The nature and internal properties of surfactants or emulsifiers play a vital role in solving problem. Stability of multiple (Opawale, et al., 1998) emulsions has been shown to be dependent on emulsifier interfacial film strength, ionic strength, various additives, and concentration. According to Vasiljevic et al. (2005), when the concentration of emulsifier in oil phase is higher, the multiple emulsions will have lower droplet size, higher viscosity and elastic characteristics. Moreover, changing the concentration of surfactants, results in the difference of the amount of retinol released from silica particles. In addition, different polymers which are added into the aqueous phase, the encapsulation efficiency of retinol was also changed (Hwang et al., 2005). The process of multiple emulsion formation and various destabilization processes can be determined by video microscopy (Ficheux et al., 1998). A unique dimpled structure is a signal to show the deformation of the multiple droplets and coalescence of the internal dispersed phase by coverslip pressure. If the multiple emulsions po ssess relatively high stability, then such structure come out for long-time observed in the presence of adequate concentrations of surfactants and additives. So, Formation of the dimple structure is linked with interfacial film strength and long-term multiple emulsion stability (Jiao et al., 2002). The long-term stability of the double emulsion requires a balance between the Laplace and osmotic pressures among droplets in W1, because a stable W1/O emulsion is a fundamental and significant step in order to prepare a stable W1/O/W2 double emulsion. Garti (1996) illustrate the concept of weighted hydrophile-lipophile balance (HLB) is important because the value is linked with the droplet size, the number of W1 dispersed in inner phase and the stability of the W/O/W multiple emulsions. Such properties are so significant in preparing relatively stable multiple emulsions that the weighted HLB value is considered as a potential reference to select the optimal type of emulsifiers in forming multiple emulsions. In the first step of preparation, HLB(I) stands for the HLB value of the hydrophobic emulsifier, CI means the weight percentage of the hydrophobic emulsifier in the fundamental W1/O emulsion, In the second step of preparation, HLB(II) stands for the HLB value of the hydrophilic emulsifier, and CII means the weight percentage of the hydrophilic emulsifier in the W1/O/W2 multiple emulsion It was observed that using a combination of an amphoteric high HLB surfactant and an anionic surfactant can prepare a stable system(Kanouni et al., 2002). The inner phase is demonstrated to be better stabilized by minimizing the size of droplets and forming microemulsion droplets or microsphere particles, or applying more potential surfactants in order to seal the active ingredients in the interface (ORegan and Mulvihill, 2009). Choosing of optimal surfactants has made a positive effect on controlling particle size in multiple emulsions. Sepideh Khoee and Morteza Yaghoobian (2008) propose that the mean diameters of nanocapsules containing penicillin-G are linked with the properties of surfactants. that is to say, the different types or content of surfactant used in formation of multiple emulsions can result in different droplets size. N. Heldt et al. (2000) point put that changing the ratio of lecithin/SXS make an effect on the average size of the corresponding vesicles in the oil-wa ter emulsion. In addition, egg lecithin considered as hydrophobic substance, sodium xylenesulfonate (SXS) acts as the hydrophilic matter. As the ratio goes up, the average vesicle size increases correspondingly. Stability can be improved by offering suitable stabilizer because the surfactants act as film former and barrier to the release at internal interface(Khoee and Yaghoobian, 2008). Two charged biopolymers, whey protein isolate (WPI) and enzymatic modified pectins, interacted in aqueous solution to form a charge-charge complex which acts as a hydrophilic polymeric steric stabilizer improving the multiple emulsion stability .Regulating the conditions to get the result of most relatively stable condition. For example, as pH can determin the size of the complex ,when pH =6, the most stable double emulsion are gained because of the smallest droplet size, the lowest creaming, highest yield, and minimized water transport(Lutz et al., 2009). Henry et al. (2009) have studied six emulsifiers in their experiments, it is shown that as the amount of emulsifier increased, the phenomenon of coalescence occurs go down. Furthermore, droplet size is dependent on both break-up and re-coalescence events in emulsification, for example, when the surfactant concentration is lower, the droplet size is prone to a result of multiple break-up events. It is shown in the results of experiments that the frequency of droplet coalescence is decreased to a minimum as the process of preparation is under an optimal surfactant concentration, which balances the formation of the smaller possible droplets and relatively stable in preparation and long time storage. On the basic of experimental results which is analyzed by equilibrium phase diagram as well as observed through polarization microscopy, Yihan Liu et al. (2009) have got the conclusion that certain type of multiple emulsions which a liquid crystal can be formed by the surfactant with water are more stable compared to counterparts with no liquid crystals exist in the surfactant but prepared in the same condition(Liu and Friberg, 2009). Garti and Aserin (1996) propose that macromolecules together with monomeric surfactants can be served as steric stabilizers to improve the stability of multiple emulsions. The synthetic polymeric surfactants are ideal interfacial barrier to improve thermodynamic stability and entrapment, which is very helpful in reducing release rate of entrapped additives,and preparing smaller double emulsions with long-time stability. Take WPI-polysaccharide conjugates as an example, compared with monomeric surfactants used only, the application of polymeric emulsifiers results in better encapsulation and controlled release of addenda (Benichou et al., 2006). Transport mechanism in multiple emulsions Various kinds of possible mechanisms have been illustrated to interpret how the substances transport through the oil phase. Oil soluble substances just transport through the oil phase by diffusion which is served as controlled mechanism. Many factors contribute to the transport rate, such as the properties of oil phase, the nature of ingredients, and the conditions of aqueous phase (Chang et al., 1987) .In the previous study, it is found that water and water soluble substance can easily migrate through the oil phase. Kita et al. (1977) demonstrate that two possible mechanism can be applied to interpret the phenomenon of transportation: (1) reverse micelle transport; (2) diffusion across a very thin lamella. Cheng et al. (2006) demonstrate that both Cl- and Ag+ can transport through a thick oil film through observing and measuring the formation of AgCl precipitate in the W1/O/W2 multiple emulsion. Ions can not transport through the oil film which is very thin (

Legalization Of Illegal Drugs

There are simply no positive reasons to criminals any illegal drugs and plan to show you why. The fact that keeping the same laws on drugs won't change anything is a pretty basic concept. To put it another way, people already take drugs and if we don't change anything people will continue to take drugs, get addicted and potentially commit any crime from petty thievery to murder. That may seem an exaggeration, but a report back in 2003 from the Joseph Renowned Foundation found that 50% of people in custody and awaiting trial admitted they were dependent on a drug.Given that the Scottish Social Attitudes survey of 2009 found an increase of 6% from 2001 (41% to 47%) in Scottish adults close to someone who has used illegal drugs, it would be safe to assume this figure has also risen. So, with it now established that people take drugs despite it being against the law, we need to try and make drug consumption more structured, more stable and ultimately safer. As production is illegal, the drug trade lacks all health and safety restraints put on other legitimate markets such as quality control and warning labels.Therefore if someone decides they want to sample cannabis, et their weekly heroin fix or even buy some cocaine for a night in as if it were a box of Principles, they have almost literally no idea what they are buying from a drug dealer. The value is so high that drugs are often diluted with similar looking substances thus leaving consumers with drugs like heroin that's only 3 to 6% pure. This opens up a whole host of other problems- if you're used to a 3% intake of heroin and your drug dealer changes to a 6% you've unknowingly doubled your intake.In a system of controlled legalization (that I will detail later) these problems and a few others become history. Don't take drugs. You (hopefully! ) don't take drugs. Yet despite this we are both still at risk from drug related crimes and street violence related either directly or indirectly to drug use. Due to the i llegality of drugs the supply and manufacture is obviously limited, meaning the price rises. As an example, a kilogram of cocaine worth $3000 in Colombia (where cocaine is legal) sold at retail price in the USA for $300,000.This type of money isn't obtainable through legitimate means for most ordinary people, especially when they become addicted and have to keep coming back for more. Therefore they turn to crime, whether organized or not. These people steal whatever they can to fund their habit and depending on the severity of their addiction could end up killing in order to try and collect funds. This puts completely uninvolved members of the general public, like you and me, at risk and means any one could be harmed by the drug trade. As well as that, those purchasing the drugs legitimately or not find themselves in completely unnecessary danger.The drugs or so valuable they became targets for theft and assault. This is another thing that can be avoided by the controlled legalizati on will outline soon, as prices will collapse and with it the need to teal or commit other crime to obtain drugs. I've mentioned it a few times, and it's now time for me to outline what I mean by controlled legalization and the positives think it would bring to our country. Drug consumption rooms are a very successful method of controlled legalization that is growing in popularity in Europe.Consumption rooms in Copenhagen, Denmark Consumption rooms allow people who want to take drugs to inject them under supervision and in a safe environment. In the Danish rooms, despite over 1 00 overdoses there has not been a single death to date. The major positive is the government can now control drug use. An alternative to drug consumption would be a more full and dramatic method of controlled legalization. Legalize all aspects Of the trade surrounding a particular drug, but in doing so create strict controls on manufacturing and sale, not unlike the current prescription system.Starting with t he likes of Cannabis and Cocaine and if this is successful soon moving on to harder and more serious drugs. Lord Sugar is one well known businessman and role model who supports this. In his Autobiography he talks of selling Cocaine and Cannabis in small sachets in pharmacies for just E, with around El tax on each. As well creating safer drug use, being rid of dealers and cartels it also creates more money which the government could then spend on genuine issues like poverty and education.Who knows, if people are educated better and grow up in nicer environments they may not even turn to drugs in the first place. As means of a summary of all this, if we want to improve our drug culture and the way they are treated here then something needs to change. Personally I lean towards full controlled legalization, in the form of selling drugs to over ass through pharmacies in a controlled, stable and educated way, but I see he merits of consumption rooms and would be for their use in the UK.

Sarojini Naidu Life Biography - 961 Words

Sarojini Naidu: Life Biography: Sarojini Naidu, nicknamed Bharatiya Kokila ,The Nightingale of India, was the first woman president of the of the India National Congress, and she was the first woman to become an appointed governess of a state, Uttar Pradesh, in India. She was born in Hyderabad, India on February 13, 1879. Sarojini was raised by her father, Aghoranath Chattopadhyaya, and her mother, Barada Sundari Devi. She was the oldest amongst eight other siblings. Her mother was a poetess and her father was a scientist and a philosopher, as well as the founder of the college Sarojini first attended, the Nizam College. At Nizam, she was awarded a scholarship for her play Maher Muneer, which extended her education to study abroad. The†¦show more content†¦She had also taken part in the Civil Disobedience Movement and the Quit India Movement, where she had been jailed along with other leaders. In her participation of the movements she opened the eyes of the women of India. She took them out of t he old-ages where they stayed at home and cooked in the kitchen. She helped fight for women s rights, and regained the individual self-esteem of India s women. Sarojini had become an icon for India by the time her life ended in Lucknow, India on March 2, 1949. She had become a distinguished poet, an activist for women s rights, as well as one of the best political speakers for India of all-time. Life: Sarojini s poem Life defines what life truly is after the bliss of ignorance one experiences as a child. She begins by explaining that a child s perception of life is a lovely stalactite of dreams, which symbolizes a child s natural expectation that everything they want or need will be handed to them from their parents or guardians. Like the dripping of the stalactite, a parent drips money and time into a child s future by providing their needs and wants for them. Sarojini then continues by calling life as seen by a child a carnival of careless joys, similar to when a child receives a new colorful toy, but it is soon forgotten by other new things they receive. In the end of her description of a child s view of life, she says About your hearts like billows on the deep, in flames of amberShow MoreRelatedCivil Disobedience And Its Effect On Society998 Words   |  4 Pagesforeign cloth, picketing of liquor shops, and rent withholding. Other issues came to the fore in the campaign as w ell, such as Hindu-Muslim unity and an attack on the caste system (Kurtz).† Gandhi was imprisoned for almost year. During that time Sarojini Naidu took over the protest with an iron fist. When Gandhi was released he signed the Gandhi-Irwin Pact and ended the march. The Pact declared peace between the Indians and British. The pact did not make Gandhi’s minimum requirements though. The marchRead MoreRole of Women in India Freedom5428 Words   |  22 PagesLakshmibai Biography......... The first name that comes to mind is that of the famous Rani Laxmibai of Jhansi. Dressed in men’s clothes, she led her soldiers to war against the British. Even her enemies admired her courage and daring. She fought valiantly and although beaten she refused to surrender and fell as a warrior should, fighting the enemy to the last. Her remarkable courage inspired many men and women in India to rise against the alien rule. ....Jhansi Ki Rani Lakshmibai Biography.......Read MoreGandhi vs Genghis Khan2439 Words   |  10 Pagesthe west coast, there to prepare salt in symbolic violation of British law. These were populist movements in which people from all classes and all parts of India participated with great fervour. Women too, played an active role in the struggle. Sarojini Naidu, Aruna Asaf Ali and Bhikaji Cama, to name but a few, inspired millions of others to take the first step on the road to emancipation and equality. In August 1942, the Quit India movement was launched. I want freedom immediately, this very nightRead MoreQuaid E Azam7455 Words   |  30 Pagesafter Pakistan gained independence from the British Empire. Contents [hide] 1 Early life 1.1 Years in England 1.2 Western influences on personal life 1.3 Return to India 2 Early political career 3 Fourteen points 4 Leader of the Muslim League 5 Founding of Pakistan 6 Jinnahs vision for Pakistan 7 Governor-General 8 Illness and death 9 Legacy 10 Criticism 11 Notes 12 References 13 External links [edit]Early life Jinnah in his youth, in traditional dress. Jinnah was born Mahomedali Jinnahbhai (Gujarati:Read MoreOne Significant Change That Has Occurred in the World Between 1900 and 2005. Explain the Impact This Change Has Made on Our Lives and Why It Is an Important Change.163893 Words   |  656 PagesPerspectives on the Past, edited by Susan Porter Benson, Stephen Brier, and Roy Rosenzweig Also in this series: Paula Hamilton and Linda Shopes, eds., Oral History and Public Memories Tiffany Ruby Patterson, Zora Neale Hurston and a History of Southern Life Lisa M. Fine, The Story of Reo Joe: Work, Kin, and Community in Autotown, U.S.A. Van Gosse and Richard Moser, eds., The World the Sixties Made: Politics and Culture in Recent America Joanne Meyerowitz, ed., History and September 11th John McMillian