Fraction

which was then partitioned with ethyl acetate and methanol respectively. TLC analysis of the ethyl acetate fraction revealed the characteristic blue spots of polyketides with vanillin/sulfuric spraying reagent as well as the positive results with Dragendorff’s reagent. Using silica gel column chromatography run with dichloromethane and methanol, pulchranin A was detected in the first few fractions F5 to F10 with Rf value…

Powder samples were dispersed in saturated ethanol and bath sonicated for 15 s before transferring in to fraction cell. The refractive indices of kanamycin (1.67) (for kanamycin-only and kanamycin-rifampicin combination powder) and rifampicin (1.61) were used to automatically measure the particle volumetric diameters of the prepared powders by the built-in LA-950…

At the end of the nineteenth century, scientists believed that all matter was composed of atoms. However, an English physicist named J.J. Thomson (1856-1940) discovered an even smaller particle that he called corpuscles, although we know them as electrons today. Thomson discovered that electrons are negatively charged, that they are much smaller and have less mass than atoms, and that they are uniformly present in many different types of substances. With this new discovery, the question of a…

The universal outrage over overpriced essential drugs has put another pharmaceutical company in the spotlight. Gilead Sciences Inc. apparently knew that their Hepatitis C treatment would be too expensive for most patients and would cause “extraordinary problems” for government health programs, Wall Street Journal noted. The 144-page US Senate report on Gilead's pricing practices is the latest in a chorus of criticisms launched against big pharmaceuticals. The committee overseeing the…

Synesthesia is a neurological phenomenon in which stimulation of one sensory or cognitive pathway leads to automatic, involuntary experiences in a second sensory or cognitive pathway. People who report such experiences are known as synesthetes. Difficulties have been recognized in adequately defining synesthesia: many different phenomena have been included in the term synesthesia, and in many cases the terminology seems to be inaccurate. A more accurate term may be ideasthesia. In one common…

verge of extinction because of the federal government’s determination to push west. Before Columbus reached America the Natives were prosperous. When the US pushed west, it caused the deaths of many Native people. Now, the Native Americans are a fraction of what they once were. The near-destruction of many Native American civilizations was caused by the US federal government. Before 1492, when Columbus discovered America and gold fever spread throughout Europe, the Native Americans were thriving…

When a human being is brought into the world, it’s first instinct is survival. Because we are creatures of survival, the extremity of lengths we go to measures how much objects, beliefs, and people have influenced us to survive. Some authors have portrayed our lengths of survival to it most authentic forms, such as the Director Philippe Falardeau in,”The Good Lie” and the author Sara Corbett who wrote the eye opening article of “The Lost Boys”. The movie,”The Good Lie”, based on true…

The Modern Library has attempted to stage a comeback by launching a large and ambitious series of handsomely produced volumes, most of which are indeed by leading authorities. Not so this slim work on Islamic history, a scandalously apologetic and misleading account written by a former nun with an ax to grind. The apologetics start with the Prophet Muhammad and conclude with the present day. Armstrong goes out of her way to soften every hard edge, explain away every unpleasantness, and hide…

The Civil War had left many cities and people in ruins and they needed time to rebuild momentum in their country. During this time, the government had scurried to solve problems in the south after major laws had been put into action. Promises were made and lost, leaving certain individuals in major conflicts. With so many situations to take care of, issues had started to occur for the poor and the African Americans. Overall, Reconstruction was a failure because it was difficult for people to…

Has it ever been wondered how probability and statistics take place in an article? Well its used many times throughout many different types of articles. When looking through one I found that more statistics or facts are present than probability. Some of these facts that were found in the article ¨Immigration and the Great Recession¨ were Demographic change, dynamics, and data. Demographic change is a fact shown through how the United States has changed in the past decades. It shows the growth…