Ask an Expert (Page 158)

Serial Dilution from E. Coli Kwik Stik (ATCC 25922)

Ask an Expert Topic Forum: Grades 9-12: Life, Earth, and Social Sciences

Serial Dilution from E. Coli Kwik Stik (ATCC 25922) Serial Dilution from E. Coli Kwik Stik (ATCC 25922) Have a good day everybody :') I have questions about serial dilution which i am not sure how to start with. I've already read some information from the internet about serial dilution but i still don't get what i want to know. I hope that you all can replay me ASAP. Thanks. I want to make a dilution from E. Coli Kwik Stik. Here the problem. My questions, 1) What is the expected CFU of E.… Read more

Archimedes Squeeze Experiment - Density values over 1g/cm3 not sinking?

Ask an Expert Topic Forum: Grades 6-8: Life, Earth, and Social Sciences

Archimedes Squeeze Experiment - Density values over 1g/cm3 not sinking? Archimedes Squeeze Experiment - Density values over 1g/cm3 not sinking? Hi there Question re Archimedes Squeeze experiment https://www.sciencebuddies.org/science-fair-projects/project-ideas/Acero_p044/aerodynamics-hydrodynamics/archimedes-diameter-boat-sink which my daughter tried at home. When she did the experiment, the foil ball with a diameter of 2.8cm sank, with the longer diameters ranging on average from 10%… Read more

How should we go about the project

Ask an Expert Topic Forum: Grades 9-12: Life, Earth, and Social Sciences

How should we go about the project How should we go about the project [color=#000040]Hi, my name is Kayla and my friend Jordan and I are part of the 9th & 10th NSSA stem program, and we are doing a project on the cocoa genome. But we have a problem, our problem is in terms of experimentation we don't know what to do. What do you recommend or suggest we do? Thank u -Kayla[/color] Re: How should we go about the project Hello Kayla. Welcome to the site and thank you for your question.… Read more

Catalase activity

Ask an Expert Topic Forum: Grades 9-12: Life, Earth, and Social Sciences

Catalase activity Catalase activity Hi, I am doing an Extended Essay project. My experiment was on measuring the catalase activity of cow (bovine), pig (sus scrofa)and chicken (Gallus Gallus). The results to this is that cow had high catalase activity, pig had 2nd fast activity and 3rd was chicken. But I don't exactly have an answer why it's the case. I have been trying to research on all sorts of areas but still couldn't find an answer. I researched on DNA sequences and comparison of them,… Read more

centrifugal force

Ask an Expert Topic Forum: Grades K-5: Physical Science

centrifugal force centrifugal force Ask an expert: I am a parent of 3rd graders (twins) who have a science project coming up in 2-3 months. I would like to help them do projects on the topic of centrifugal/centripetal force. I did a project on this topic when I was in school, but I want to see if I can get an idea of how to do it better/execute it better. I based my project (at the time) on the amusement park ride called The Rotor ( the one where you are spun in a cylinder and then held… Read more

Algae Biofuel and Control

Ask an Expert Topic Forum: Grades 9-12: Life, Earth, and Social Sciences

Algae Biofuel and Control Algae Biofuel and Control Hello I am part of Energy Project and are doing emphaty research for algae biofuel and containing the algae in a safe way. How can we prevent the algae from escaping its enclosure. What could attack algae and prevent it from growing as it should. Are there any specific environmental situations that prevents algae growth. Are there any common issues with algae we should be aware of. Do you believe that algae biofuel is a better… Read more

onion dna extraction

Ask an Expert Topic Forum: Grades K-5: Life, Earth, and Social Sciences

onion dna extraction onion dna extraction My daughter and I have performed this experiment about 6 times now and cannot really get the DNA to spool. It's really difficult to measure for comparison between different onions. Just wondering if we were doing something wrong. We've followed the instructions to our best ability and then tried slight variations within the instructions (ie pipetting the ethanol onto the top vs the bottom of the tube, etc. Thanks for any advice. Leanna and… Read more

Factors You know About Hacking ?

Ask an Expert Topic Forum: Grades 9-12: Math and Computer Science

Factors You know About Hacking ? Factors You know About Hacking ? Moral Hacking is regularly alluded to as the method involved with infiltrating one's own PC/s or PCs to which one has official consent to do as such as to decide whether weaknesses exist and to attempt preventive, restorative, and defensive countermeasures before a genuine trade off to the framework happens. Source :… Read more

Iodine Clock Reaction | HCl Substitute??

Ask an Expert Topic Forum: Grades 9-12: Physical Science

Iodine Clock Reaction | HCl Substitute?? Iodine Clock Reaction | HCl Substitute?? The Iodine Clock Reaction is a science project posted on Science Buddies measuring the reaction rate at which the dark blue complex takes to form. In the chemicals needed (provided by Science Buddies), HCl is included. Is there another alternative to the project to create the iodine reaction, perhaps without HCl? Or a possible substitute for HCl? I do not understand the need for HCl when another less… Read more

Soil Moisture Sensor Parts

Ask an Expert Topic Forum: Grades 9-12: Physical Science

Soil Moisture Sensor Parts Soil Moisture Sensor Parts Hello, I was wondering if I can substitute a 74HC595 IC for a CD4011 NAND gate IC (which is part of the kit)? Also does a 470 MΩ resistor work better than a 330 MΩ; does it matter if I don't use those exact types of resistors? What are the differences and will the sensor still work? Re: Soil Moisture Sensor Parts Hi - are you sure you got the right part number for the 74HC595? When I search for that part it is described as a shift… Read more

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