Homework Help

Hi so my question is basically on dilutions which I need to do for carrying out an MIC test in microbiology a 1 in 10 dilution converted to percentage is 0.01, a 1 in 100 dilution is 0.001, however if I had a 1 in 10 dilution in my microtitre plate well A1 in which I have added 1ml of bacteria and 9ml of water, how much would I be taking from this first well to the second well to make it 0.06% ? and how much sterile water would I be adding ? and also is 0.06, a 6 in 100 dilution ? please help confused !

Hi, So i have made some serial dilutions and counted my colonies from two plates (replicate plate also) taken the average and that is 30. These plates were from my 10^2 dilution. Overall i had made 7 dilutions from 10^8 to 10^1, and total dilution is 1 in 10. The vol i plated on to the agar plates was 1ml. So to get CFU per ml in in the original stock solution (10^8), I need to use this formula which is Colony count per plate x dilution factor /vol plated. However, when it says dilution factor do they mean the total dilution factor which is 1 in 10? or the dilution of the actual plate which is 10^2 ? Can someone please just clarify this, I have lo…

Hi, How can I perform a 2-fold serial dilution in a microtitre plate for an MIC test ? (minimum inhibitory concentration test) please help,

Narceine contains 10.8 mass % water and has a molar mass of 499.52 g/mol determine x in narceine · xH2O. Please show all calulations. Don't find the composition of narceine.

When keeping the same volume of Ammonium nitrate, and changing the volume of water in the reaction of the two substances, what is the link between increasing and decreasing the volume of water in relation to the temperature of the solution once the reaction has taken place? (This will aid my hypothesis). My understanding is that the larger the volume of water, the smaller the temperature drop in the solution from the original ammonium nitrate to the final solution. This is because, since ammonium nitrate is the limiting reactant in the reaction, once the water becomes in excess because all the ammonia and nitrate ions have separated, having more water just means there…

Hi everyone. I'm taking a Gen Chem class, and I don't know how to solve this problem. I already have calculated all the values I need, but I don't really understand how to use these values to determine the answer to this. Can someone please walk me through this last problem? Thank you. Determine the average ratio for your trials. A ratio can be expressed as a single number. Calculate the percent error in your average ratio, using the accepted molar ratio for magnesium oxide. From your average ratio, report the experimentally determined, average empirical formula for magnesium oxide. I already have the ratio of Magnesium to Oxide. Where would I go from there? I have the…

hello, i need to design analog circuit that has a transfer curve as seen in the following image using resistors, capacitors,voltage, and BJT (with beta value of 100). the parameters are: A=75 f1= 21Hz f2=21 KHz M1=40 M2=-20 the circuit also need to have input resistance of Rin= 60 kilo-ohm and output resistance of 51 kilo-ohm. i think the circuit should have 3 stages, each connected with a capacitor, where the first stage is for achieving the required input resistance, the second for the required gain, and the third is for the required output resistance. (the first and last stages might also add some gain but it will be considered in the second stage) My question i…

What is the equivalent weight of acid if 1.321gm acid reacts with magnesium to give 1.72gm salt?

Find the speed of a 3 kg mass when it reaches the 10 m mark. The net force is in the same direction as the motion. Moving on straight line (rectilinear) I think I'd have to use net work = change in kinetic energy theorem here. Since the net work would be the area under the force position graph, I counted the boxes under the graph. So I tried just counting all the boxes and got (around?) 39 boxes. I then multipled that by 20 since each box is 20 N and got 780 N Since W = F *d = 780 N * 10 m = 7800 N*m So 7800 = .5 m v^2 Solving for v, I got 22.8 m/s. But the answer is actually 24. I think that's due to me not counting the correct number of boxes? or is t…

Given a 2.0 kg mass at rest on a horizontal surface at point zero. For 30.0 m, a constant horizontal force of 6 N is applied to the mass. For the first 15 m, the surface is frictionless. For the second 15 m, there is friction between the surface and the mass. The 6 N force continues but the mass slows to rest at the end of the 30 m. The coefficient of friction between the surface and the mass is _____. To solve this, I found the velocity at 15 m by first using F=ma to find that the acceleration for the first 15 m is 3 m/s^2. Then I used a kinematic equation to find that the velocity at 15 m is sqrt(90). So then, for the second 15 m, I drew a force diagram a…

Please guide me for finding the equivalent capacitance for the given problem attached.

Hi I have a question about how to calculate constant speed, but im only given mass and a few forces and I know speed is distance over time. So now im not quite sure how I would calculate this. Given: A train is accelerating on a horizontal track. mass -> 120 Mg (I assume Mg is an error and making it tons) forces -> Resistance to movement is 5N per kN of the mass -> In draw-bar of the locomotive is 80kN (If needed I can type out the full question iv been qiven) Thank you Richard

This isn't homework help, but rather just help understanding something. Hi, I'm a freshman chemistry major. I recently found out that my lab TA is doing experiments with a thing called "Raman Scattering". Of course, we in the class have learned a smidge of Raman scattering. We had to describe it using a Joblonsky diagram and such. I got those questions wrong though since I had no clue what a Joblonsky diagram was (now I know). I've tried doing a bit of research into figuring out what Raman scattering is. Of course it has to do with light and absorbance, specifically how light defracts to give color. I know that it involves a "virtual state". Thats pretty much it. …

What group of vertebrate animals has the lowest number of heart chambers?

I need help for my school project, where we are trying to be experts in chosen areas of science. I want to know if anybody out there has any ideas on what i am going to glue together using wooden sticks, different sizes wooden balls, paper balls etc. I already made the sun and a lithium atom using these recources.

Hi! I've recently got this homework piece that i've been struggling with. It looks like this: What i've come up with so far is this: is it correct to just replace my known values to these equations? Any help will be appreciated, thanks!

So I want to find the Laplace transform of: [latex] f(t)=\alpha e^{-\alpha t} + \beta e^{-\beta t}[/latex] I make it: [latex]f^*(s)=\frac{\alpha}{\alpha+s}+\frac{\beta}{\beta+s}[/latex] Which I thought simply follows from the linearity of the integral operator. But according to my lecture notes it is: [latex] f^*(s)=(\frac{\alpha}{\alpha+s})(\frac{\beta}{\beta+s}) [/latex] I'm hoping there is a mistake in the lecture notes, otherwise I've totally misunderstood things. I would appreciate it if anyone could comment on which answer is correct.

Investigating The Decomposition of Hydrogen Peroxide Introduction The object of this experiment is to investigate the decomposition of hydrogen peroxide and the factors affecting the rate of the reaction. Hydrogen peroxide decomposes as follows: H2O2(aq) à 2H2O(aq) + O2(g) The reaction is very slow in the absence of a catalyst; in the presence of manganese (IV) oxide, however, the reaction only takes a few minutes. Procedure Weigh out 0.05 g of the manganese oxide using a spatula and balance and place it into a conical flask. Using a measuring cylinder, measure out 25 cm3 of an aqueous solution of hydrogen peroxide. Fill the 100ml measuri…

Calculate the ATP produced from the following fatty acid A- C22:0; Fatty acid B= C22:4. Do you expect both fatty acids to generate the same number of ATPs since the chain length is identical? Why or why not? I have no idea how to solve this, I believe it involves the stops of beta oxidation but I need so much guidance.. anyone?

May I know the following 1) What is the difference between digestible & indigestible carbohydrates in terms of structure? 2) What is the difference between digestible & indigestible carbohydrates in terms of function? 3) What is the action of digestive enzymes on digestible carbohydrates? 4) What is the action of digestive enzymes on glucose transporters? Thank you very much for your kind attention:)

Hello, I have a question in regards to these two systems. I have to state some differences between the blood composition of the pulmonary vein and the pulmonary artery. This is what I have so far. Pulmonary Artery - 1) Carries de-oxygenated blood 2) Has a higher CO2 content. Would this be correct in assuming? And I know arteries generally carry oxygenated blood and hence are nutrient rich, since the pulmonary artery has deoxy blood, would it be nutrient poor? My next question is in regards to the urinary system. The differences in the content of the efferent arteriole versus the bowman's capsule I already know that the bowman's capsule contains the g…

For part of a homework question I need to write: [latex] f(x,T)=\int_a^b G_{w^2}(x-s)ds [/latex] as a convolution integral, where: [latex] G_{\sigma^2}(x) = (2{\pi}{\sigma^2})^\frac{-1}{2}e^\frac{-x^2}{2{\sigma^2}} [/latex] So my understanding is that I need to express the above integral in the form: [latex] \int_{-\infty}^{\infty} f(x-y)g(y)dy[/latex] Is this the correct understanding? Also, is anyone able to give a little insight into these convolutions integrals - I find them very strange and do not understand them in the least. Thanks to any and all help.

Could you help my solve the following example: a(t)=(1+r^2)^3 (1-t^2)^4 sin^3 t Many Thanks

Please could you help my solve this example: Use integration by parts to solve: Integral xsin(2x)dx Many Thanks

Hi friends, i have to submit a project for my science lab exam and the topic is mobile networks, i want information on base transceiver stations, i have gathered other details but could not find details regarding power consumption, can anyone here explain me what is the power consumption by a bts with/without supporting equipment such as air conditioners etc.