To compare the growth of yeast between two yeast suspensions Essay Example

To compare the growth of yeast between two yeast suspensions Essay Example To compare the growth of yeast between two yeast suspensions Essay To compare the growth of yeast between two yeast suspensions Essay Method: 25mL of grape juice, and half a teaspoon of sugar was added to Flask A, then heated to boiling point for one minute. A thermometer was then placed in the flask and plugged with cottonwool. Flask A was then left to cool down to 30?C. Once the flask reached 30?C the cottonwool was quickly taken out and a quarter of a packet of yeast was added, as quickly as possible the cottonwool plug was replaced. The rest of the grape juice and sugar was then placed in Flask B and then heated at boiling for one minute. The yeast leftover was then added to the boiling mixture, plugged with cottonwool then allowed to cool. Both Flask A and B were then left at 25?C overnight. The cottonwool was then removed from Flask A and a sterilised dropping pipette was used to place a drop of the suspension onto a slide. A cover slip was then placed on top and the slide was then observed under the microscope. Cells were then observed under the low power lens and yeast was observed under the higher power setting. This process was repeated for flask B and the results were then recorded for both. Diagram: Results: When the flasks contents were observed after the 12 hours there was a clear difference in colour between flask A and flask B. Flask A was very white, cloudy colour whilst flask B was the same as when boiled. Flask A smelt very sweet (like wine) and flask B still smelt like grape juice. The cells and yeast in flask A were much more tightly packed yet they were very spread out in flask B. Discussion: The differences in yeast action can be explained through the difference in procedure. Flask A was cooled to the optimum yeast growth temperature before the yeast was added, this provided better conditions compared to flask B where the yeast was added at 100?C and therefore sterilised or killed. The purpose of boiling the grape juice and sugar is to fully dissolve the sugar so that it provides food for the yeast to live off. It is important to start with sterile flasks because otherwise there is a risk of contamination and possibly brewing pathogens. It is important to replace the cotton wool immediately after the addition of yeast because otherwise airborne contaminants may enter the flask and ruin the experiment. While adding the yeast it was important not to put the cotton wool on the bench because the cottonwool may get contaminated. The yeast was activated by providing the right environment for example the necessary nutrients and temperature.

Online Public Schools for Pennsylvania Students

Online Public Schools for Pennsylvania Students Students residing in Pennsylvania can  take online public school courses for free. Schools included in this article met the following qualifications: they have classes available completely online, they offer services to state residents, and they are government-funded. Presented here is a list of some no-cost online schools serving elementary and high school students in Pennsylvania as of May 2017.   21st Century Cyber Charter School Pennsylvania students in grades 6 to 12 can attend 21CCCS, which provides a rigorous and personalized curriculum, highly qualified instructional staff and a supportive educational community. Using PSSA scores, Keystone Exam scores, PSAT participation, SAT scores and other academic performance measures, 21CCCS regularly outperforms other Pennsylvania cyber schools. 21CCCS holds the highest score of any cyber charter  on the College Ready Benchmark, which includes the SAT and ACT scores of 12th-grade students. 21CCCS has also been ranked in the top 5 to 10 percent of high schools in Pennsylvania for SAT scores. The school provides students with a flexible, individualized learning environment. Asynchronous learning offers students 24/7 course access and a 56-hour-per-week window where they can work one on one with PA certified, highly qualified teachers. Agora Cyber Charter School Agora Cyber Charter School’s mission and commitment are to provide an â€Å"innovative, intense academic program that inspires and educates students to achieve the highest levels of academic knowledge and skills and develop proficiency in the design and use of new computer technologies and scientific research.† The school partners with families and the community to ensure that every student’s Individualized Learning Plan is not only met but exceeded. Agora Cyber Charter School’s nine core values, which shape and define the school’s climate and culture, are empowerment, innovation, respect, compassion, integrity, personalization, teamwork, courage, and responsibility. Reach Cyber Charter School Reach Cyber Charter School courses are offered throughout the year- during the fall, spring and summer sessions. As a result, this online high school provides Pennsylvania school students with three flexible graduation pacing options. In the Standard Pace option, students take a full course load in fall and spring. For the Year-Round Pace options, students take fewer classes than usual in fall and spring, but they also attend school in summer. Accelerated Pace students attend full-time year round, leading to early graduation. The school uses a secure education management system on which parents and students can locate necessary documents, communicate with teachers, find daily lessons and more. SusQ-Cyber Charter School SusQ-Cyber Charter School uses a blended curriculum, with content from a variety of providers. In synchronous online classrooms, students participate along with other students and the teacher in real time. As a fully staffed public high school, SusQ-Cyber has a Guidance Department, Student Health Services, and a Special Education Department. The school’s technical support staff, among other tasks, keeps up with all the gear that students receive: an Apple computer, as well as an iPad for 11th- and 12th-grade students, any necessary software; a personal internet hot spot; a printer and ink; and calculators.