Calculations - Science topic

Hello everyone,

I’m currently working on analyzing ICP-OES data and I need to calculate the weight percent (wt.%) of Fe, P, S, and Li in two LiFePO4 samples from the results. However, I’m struggling to figure out the correct method to do this. I have searched extensively but haven’t found a clear explanation or procedure.

I have attached an Excel file with the ICP-OES data that I am working with. If anyone could guide me on how to proceed or provide any references or formulas, I would greatly appreciate it! Please tell me just one way to find the wt.% of any element.

Thank you so much in advance for your help.

Suppose that in January 1996, 1000 adult residents of a community accepted an invitation to be examined for hypothyroidism at a local clinic. Eight persons were found to have the disease, it was newly discovered in 3, and 5 were already under treatment. The same group was examined again in January 1998. Six new cases of hypothyroidism were discovered; of these, two had developed symptoms several months before and had been diagnosed and treated by their personal physicians. It was learned that of the 8 hypothyroid persons discovered at the 1996 examination, one had discontinued medication and died of heart disease in 1997. Otherwise, all persons examined in 1996 came to the second examination.

Using the above information, respond to the following questions – don’t forget to use the formulas already provided in this chapter:

I would greatly appreciate your assistance in verifying my calculations and providing any insights you may have.

Does Wolfram prefer quantum mechanics or relativity? Why?

Imagine an enormous cylinder in a flat landscape. You are standing along the inner edge. How big would the cylinder need to be for you to not see the curvature? I.e., Instead think you are standing along a completely flat wall. Consider an average person with average eyesight. Would happily accept both the motivation, answer and calculation.

Bonus question: If you had any particular practical tools to your disposal to improve your estimate of the curvature in this scenario, what would they be and how would they help?

Hi! I want to ask about the density calculation of a particle or particles. I have read in Allen books to calculate the density of particles by using dispersant and go to m/v with addition calculation. I dont want to use dispersant because unreachable and difficulties to purchase dispersant here. Let me know if anyone has the procedure. I want to calculate organic particle (powder from natural substance). It has certain mesh number of 140 mesh

I am looking to estimate the diameter (nm) of a variety of double stranded plasmids (pUC19, pMAL pIII, pKLAC2, etc.) when they are natively supercoiled and when they are relaxed.

If someone could point me towards a formula it would be much appreciated! Thanks. 

What is the type of feedback for this circuit? and why?

I want to calculate ∆G, ∆H and ∆S values for an adsorption isotherm using the following formulae:

1. Adsorption equilibrium constant (Kd) = qe/Ce

where,

qe=equilibrium adsorption capacity (mg/g) and

Ce=equilibrium concentration of the adsorbate (mg/L)

2. qe = {(Co-Ce)*V}/m

where,

Co = initial concentration of the adsorbate (mg/L)

V = Volume of the bathing solution (L)

m = mass of the adsorbent (g)

3. ln(kd) = (∆S/R)-(∆H/RT)

4. ∆G = ∆H - T∆S

I have used seven initial concentrations of the adsorbate (Co) (viz. 2, 6, 8, 10, 20, 40 and 80 ppm As) for conducting the adsorption isotherm experiment under two temperatures (i.e., two sets of adsorption reactions, each with seven levels of Co).

The problem I am facing is that I am getting seven different Kd (Adsorption equilibrium constant) values for seven 'Co's under each set of adsorption experiment.

Which Kd value should I take for further calculation of the thermodynamic parameters (∆G, ∆H and ∆S)? Do I need to average all the seven Kd values for a specific temperature? Or should I take the Kd value corresponding to the highest initial concentration (i.e., 80 ppm As) of the adsorbate? Or something else?

I want the formula for calculating H₂O₂ content.

The determination of LDL-cholesterol by calculation using the Friedewald equation is widely used worldwide. For several years, several international and national guidelines have recommended that the Friedewald equation be replaced by the Martin/Hopkins or Sampson-NIH equation. Has there been any published data on how many real-world labs in any country or region actually use these new equations to calculate LDL-C?

J is a bias correction factor that used to remove the small-sample-size bias of the standardized differences of means.

independent t-test, and we find the paper that only showed effect size without any standard deviation

#calculation #samplesize #meandifference

Hi everyone.

I have protein with concentration of 0.6 mg/mL

The total volume of my protein is 4 mL.

Protein size is ~18 kDa

How can I convert my total protein concentration to micro molar?

Thank you.

Dear colleagues. I need to build a matrix A100x100,where are some values and a lot of zero with a shift.

Example of code:

b<-c(0.08,0.18, 0.28, 0.35 , 0.46, 0.61, 0.75 , 0.89 , 1, 0.89, 0.75, 0.61, 0.46, 0.35, 0.28, 0.18, 0.08)

a14<-c(rep(0,4),b,rep(0,79))

a15<-c(rep(0,5),b,rep(0,78))

a16<-c(rep(0,6),b,rep(0,77))

a17<-c(rep(0,7),b,rep(0,76))

a18<-c(rep(0,8),b,rep(0,75))

a19<-c(rep(0,9),b,rep(0,74))

a20<-c(rep(0,10),b,rep(0,73))

a21<-c(rep(0,11),b,rep(0,72))

a22<-c(rep(0,12),b,rep(0,71))

a23<-c(rep(0,13),b,rep(0,70))

I ask you help.how is it possible to write loop in order to build a 100-by-100 matrix ,where a are rows of the matrix until a99?

Please in an experiment using foliar Zinc fertilizer and rice I obtained soil from a depth of 20cm and placed 5kg of the soil in pots of 29cm in height, diameter 32.5 cm, radius 16.25 cm and labeled them.

Details of the Foliar Zinc Fertilizer

Application rate 1L = 1 mu

Zinc content of the fertilizer (liquid) = 170g/L

Density of the fertilizer = 1.4

So after converting 170g/L, the zinc content of the fertilizer is 121g/kg

Please how should I be calculating the fertilizer?

Below is my initial calculation

Fertilizer application rate 1L = 1 mu

but

1mu = 667 square meters

So

1L = 667 square meters

Diameter of pot 32.5 cm

Radius 16.25 cm

Area = 3.14 × 16.25 × 16.25 = 829 c m2.

＝0.0829㎡

Basin area 0.0829 / 667 square meters × 1000 milliliters = 0.12ml

= 0.12ml per pot.

According to my calculation, I am to spray 0.12ml per pot. Please kindly correct and advise.

Can someone provide or give me an example how the VASP WAVEDER file looks like?

Dear ResearchGate community,

I have a statistical question which has given me a lot of headache (statistics usually do, but this is worse!). I have designed a survey in which participants read sentences, evaluate whether the sentences are meaningful and then select a response among 3 possible interpretations. I have 3 types of sentences (let's say language 1, language 2, language 3) and for each language there are 8 sentences. In total, the participants read 24 sentences (3x8).

What I'm interested is accuracy. Say a participant has accepted all 8 sentences in Language 1, whereas the correct meaning has been selected for only 5 of these. This means that the accuracy is 62,5%. In Language 2, on the other hand, the participant has accepted only 5 sentences and has found the correct meaning of only 3 of these. This means that my 100% is always changing.

Do anybody know how I can calculate mean precision with these kinds of numbers? The goal is to examine precision according to languages (1, 2 or 3). I have a feeling it has to do with ratios, but I'm quite lost at the moment!

the repellent activity is different than the excito-repellent (landing is differ than sucking)

when we use the repellent, we can calculate their repellent activity by using the percentage of protection P= (C-T)/C x 100

when we use excito repellent, how can we calculate the percentage of bitting.

Thank you

how to transform my results in the EuroQOL EQ-5D + EQ VAS to get an overall score that can be presented as “good, moderate, poor“ quality of life?

we will use it pre and post bariatric surgery research and it is not the main topic so we would like a short and easy to use questionnaire that is easy to calculate and easy to present

I performed an analysis of GST and GR. The two enzymes were quantified by optical density measurment. Now I would like to get a method to calculate concentration of the enzymes from the optical density values. Thank you for any information provided.

Greetings,

As part of my research, I am interested in studying the magnetic properties of coordination polymers using the ORCA chemistry program package.

The main goal is to calculate the isotropic exchange constant J using the broken symmetry approach.

My question is related to the input file. What should I add exactly in order to obtain such parameters?

P.S: The calculation can be carried out with the hybrid B3LYP functional using Aldrich’s def2–TZVP basis.

Thanks in advance.

I am doing a Generic inverse variance meta-analysis of Odds ratios. when I use the reported OR to Calculate the standard error in revman, the program automatically updates the confidence interval to something different than the original papers. there is no way to correct them in revman.

is this the norm? that revman calculates its own CI because the reported CI in the papers is adjusted and revman corrects it back?

I made a 20 micromolar from 10 milimolar stock.

{10000 um × V1 = 20um × 1000 (96 well = 100 well × suppose 10ul in one well drug is consumed)} = This ultimately gives me 2 microliter=V1. 2ul (from 10mM stock) + 98ul Media will give me 20um/100ul. My concern is when I will add this 10ul in 100ul media, which is already added in 96 well plate, so my drug concentration (20um) will dilute and it will changed(X). Please let me know how to calculate the exact volume to get that drug concentration without getting dilute. And I also want to know how to cross check whether in 96 well or any well plate my drug concentration is exact or not??

Please I obtained soil from a depth of 20cm and placed 5kg of the soil in pots of 29cm in height and labeled them. Please should I be calculating the fertilizer and biochar application rates according to the height of the pot (29cm) or according to the depth at which the soil was collected (20cm)? Please kindly find attached the calculations I have made and kindly advise.

Thank you for your time.

Height of pot = 29cm

1h = 10000 m²

Assuming soil bulk density of 1.2 g/cm³

Volume = 10000 m² × (29cm × 10^-2) = 2.9 × 103m³

m = p × v

m = 1.2 g/cm³ x (2.9 × 10³ × 1 × 10⁶) cm³

Volume = 10000 m² × (20cm × 10^-2) = 2.9 × 103m³

m = p × v

m = 1.2 g/cm³ x (2.0 × 10³ × 1 × 10⁶) cm³

Hi friends,

So I'm new to cell culturing research and synthetic biology and I'm working with MDA-MB-231 cells. Fairly regularly I have to at least split plates in order to maintain the cells, but I am also passaging cells for other things. Normally on a 10cm petri dish I'd plan to seed ~5.0E5 cells/mL for regular splitting and in a 96 well plate I'd seed ~4.5E4 cells/mL for my experiments. One thing I'm confused on still is using the hemocytometer to calculate cell density because I'm not entirely sure what my dilution factor should be.

Normally, I'll remove the old media, wash with PBS then trypsinize cells, after incubating for 5mins I add a bit more media until the total volume is 10mL, then I spin everything down. After that, I aspirate out the supernatant and am left with a small pellet of cells that I then break up and dilute with ~2-6mL of fresh media before using the hemocytometer to count the number of cells in 10uL.

My question is since I'm removing all the old media after centrifugation but then am adding new (different amount) media prior to counting, how does that impact the overall dilution factor?

Here's an example of what I was taught to do to find the amount of cells in 1mL, I just wanted to confirm that I'm on the right track. I was told if I resuspended my pellet in 3mL of media and then counted 75 cells I'd have:

75 cells/10E-4mL media

75 E4 cells/1mL media

7.5E5 cells/1mL media --> multiply this by 3 since you used 3mL to dilute before counting to get total number of cells (is this what accounts for the dilution factor?)

Total of 2.25E-6 cells that could be split however you see fit? Sometimes determining how many plates to get out can feel like a guessing game. Let me know if you see any issues with my method or suggestions that might be helpful, I welcome them. Please do try to be kind as I'm still learning and figuring things out. Thank you.

Kylie

Dear all,

I want to investigate the presence of selected neural markers for NSCs cultivated in 3D culture. I would like to ask for a method of counting positive cells of the IF-stained neurosphere. Is it reliable to measure the immunofluorescence intensity at the exact depth of the selected neurospheres or is there a possibility to count each cell of the neurosphere?

Thank you in advance.

while using fish for mortality studies

Dear colleagues!

There is a description of calibration mix preparation for GC method of milk triglycerides adulteration determination.

Prepare about 1 g of a mixture of the fat standards — containing at least the saturated TGs, C24, C30, C36, C42, C48 and C54, as well as cholesterol; plus, preferably, C50 and C52 — by weighing to the nearest 1 mg and recording the mass to 0,1 mg to obtain a relative TG composition similar to milk fat.

Analyse repeatedly a solution of the fat standards mixture in n-hexane or n-heptane in accordance with GC method. In the same sequence, analyse repeatedly milk fat of typical composition.

Determine the TG response factors from the fat standards mixture. Calculate the intermediate response factors of TGs not present in the mixture (please, see below) by mathematical interpolation. Apply the response factors obtained to the milk fat in order to obtain a standardized composition

Not present in mixture triglycerides C26, C28,

C32, C34,

C44, C46,

Could you, please explain how to calculate response factors of triglycerides not present in calibration mix?

Thank you in advance!

For the LEIA technique, we test different concentrations of forage plants (e.g.) in contact with larvae of gastrointestinal parasites (e.g. Haemonchus contortus).

These larvae are in the L3 stage.

We artificially induce larval exsheathment to obtain after 1 hour 100% exsheathment.

We count the unsheathed and sheathed larvae every 20 minutes for one hour.

If an inhibitory effect of the larval unsheathing is detected at the highest concentration (i.e. at 100% for example) and the negative control gives 0% inhibition.

If the lower concentrations give less inhibition between 0% and 100%, we can determine an effective concentration at 50% effect a.k.a. EC50.

------------------------------------------------------------------------------------------------------------------------------------------------French version

Les valeurs d'EC50 calculées peuvent-elles variées significativement en fonction des mesures prises dans le temps ?

Pour la technique du LEIA, nous testons différentes concentrations de plantes fourragères (par exemple) mises en contact avec des larves de parasites gastro-intestinaux (Ex. Haemonchus contortus).

Ces larves sont au stage L3.

Nous provoquons artificiellement le dégainement larvaire pour obtenir au bout de 1H environ 100% de dégainement.

Nous comptons les larves dégainées et engainées tous les 20 minutes pendant une heure.

Si un effet inhibiteur du dégainement larvaire est décelée à la concentration la plus élevée (i.e. à 100% par exemple) et que le témoin négatif donne bien 0% d'inhibition.

Si les concentrations plus faibles donnent une inhibition moindre comprise entre 0% et 100 %, nous pouvons déterminer une concentration efficace à 50% d'effet a.k.a. EC50.

----------------------------------------------------------

#LEIA #EHIA #gastrointestinal #nematods #tanins #condensed #sainfoin #invitro #biosassays #test #method #statistical #EC50 #IC50 #Haemonchus contortus #Trichostrongylus #design #experimental #tools #software

=> 2.4. Larvae exsheathment inhibition assay (LEIA)

The assays were performed once every week for seven consecutive weeks. Moisture, temperature and general conditions in the laboratory were kept homogenous along the entire experimental period. The only condition that varied was the age of larvae (from 1 to 7 weeks). The LEIA were conducted following the procedure described by Jackson and Hoste (2010). The negative controls used were larvae not treated with extract and only exposed to the PBS. The different concentrations ap plied to evaluate the AH effect of A. pennatula acetone:water extract were 1200, 600, 400, 200, 100, 40 μg/mL. Stock solution (5000 μg/mL) of acetone:water extract were made in PBS prepared with purified water. One tube was used as negative control containing 1000 μL of PBS without extract. Finally, 1000 μL of infective larvae solution (L3 ∼ 1000/mL) were added to each tube to obtain the final extract concentrations (1200, 600, 400, 200, 100, 40, 0 μg/mL PBS). Infective larvae were incubated with the plant extract for 3 h at 24 °C. After incubation, larvae were centrifuged for 3 min at 168g and washed 3 times with PBS solution. Then, aliquots of each larvae solution were placed in eppendorf vials (200 μL each). Four re petitions were performed for each concentration and PBS control. The process of exsheathment was artificially induced by contact with Milton® (Laboratoire Rivadis, France), which is a solution of sodium hypochlorite (2.0%) and sodium chloride (16.5%) diluted in PBS. The quantity of Milton® solution to use for each assay was determined every week by testing different concentrations (25, 30, 35 and 40 μL/6 mL PBS). During the first two weeks the concentration used for the bioas says was 30 μL/6 mL PBS and it was changed to 25 μL/6 mL PBS for the following weeks. The exsheathment kinetic was observed with a mi croscope using the 10× objective and recorded at 0, 20, 40 and 60 min. (https://oatao.univ-toulouse.fr/25140/1/Castaneda-Ramirez_25140.pdf)

#pIC50

analogy : https://cdn2.hubspot.net/hubfs/146552/docs/Why_Using_pIC50_will_Change_Your_Life.pdf?t=1443795935716

I have metakaolin which Contain 48.4% SiO2, 27.8% Al2O3 data from XRF. and r

equired Si:Al:Na ratios are 2.5:1:1.3

also what should be my alakli activator composition in gm. and water amount.

(precursor/activator=0.4) for a suppose 100gm of metakaolin

I am doing acetilization of cyclohexanone with methanol with molar ratio1:4. The weight of catalyst, zsm-5 is 0.04g. How to calculate the reactant to catalyst ratio?

I have to make a 0.75% Molten Top Agar in the lab.

The agar bucket in the laboratory says 35 g / L.

How much agar (in grams) do I need to make a 0.75% dilution with a total volume of 400 mL?

Hello everyone,

I found in some papers that the bolt joint can be conveniently modeled using the thin layer element which has been integrated into many commercial FE packages.

In the tutorial Modeling the dynamics of mechanical joints (S. Bogradet al, 2011, MSSP), the authors have given a simple example (see Fig. 20 and Table 4 in section 3.5 of the attached PDF); however, it was completed in MSC. Nastran with which I am not familiar. I wonder if similar treatment can be done in COMSOL?

My final goal is to simulate how the pretension of the bolts affects the dampings of different vibration modes and I think the thin layer element based method can be a possible solution. If anyone has ever done or seen similar simulations before? COMSOL based tutorial will be of great help.

Thank you so much for reading and I appreciate your help.

Best regards,

Hao

Assuming we have a piece of timber C16 - 100x100x1000mm and we apply UDL + a point load at middle point on it (parallel to the fibre) as shown below, how much will the timber compress between the force and the concrete surface ?

I have attached a sketch as well. Please see below.

If you could show a detailed calculation would be much appreciated. Thank you!

Hello,

I would like to prove that the type of coordination bond between copper and oxygen is dsp2 in the following complex structure. So I used NBO analysis, but there seems to be no related information. I wonder if there is anything else that needs to be applied.

I will receive all the advice with thanks. I also attached a file that used NBO analysis (.log).

Thank you.

Dear all,

I'm looking for a commercial partner who is able to determine log P (partition coefficient) of the protein with the use of bioinformatics tools. The protein mass is 2,4 kDa, it includes 22 amino acids and three S-S bridges.

Thank you in advance.

I am doing normal batch fermentation calculations (for the first time) and am confused about how to carry out some of the calculations. Specifically, I would like to know:

The calculation of specific/substrate uptake rate seems pretty easy from a dimensional analysis stand point. However, I am not sure whether to use the specific growth rate, μ (1/h), to account for the time dimension in calculating specific/substrate uptake rate or to use Δt instead (h). Each of them leads to different results it seems. I have seen answers that use either of them and now I am confused.

Any help would be highly appreciated.

How actual detection limit can be calculated & what is the main difference from Sandal's  Sensitivity?

Recently, I have been using the Invitrogen™ LIVE/DEAD™ Viability/Cytotoxicity Kit according to the Fluorescence Microplate Protocol.

Although it is not written in the protocol, I also prepared dead and live wells containing calcein-AM and ethidium homodimer-1 separately as it is needed in the calculation part.

But there is a part about the test results that I really couldn't figure out.

According to the results, the value I get is more than 100 when I sum up the percentages of the living cells and dead cells for the same well.

Commonly, I expect some cells to die, some cells to survive, but some cells to go into apoptosis.

When I reviewed the publications, I saw that most publications use the microscopy method. In fact, I read a few comments about the microplate protocol is not working properly in this assay.

I wonder is there anyone who has had the same problem before or if I am making a mistake while applying the protocol?

Hello,

I am having some difficulty calculating and interpreting my phenol test results and I need some help. For reference, I used 0.5g of my sample, did the extraction, and then diluted my first stock concentration (500mg/ml) to a concentration of 50mg/ml thereafter, I diluted it further to different concentrations of 10, 5, 2.5, 1.25, 1, 0.5, 0.25 and 0.1mg/ml. This is what I have done so far, I used the equation given (y=mx+b) by the calibration curve and calculated the TPC mg GAE/ml (the 3rd column). After that, I do not know what to do, I know I must some multiply some numbers by the dilution factor and such and then find the TPC mg GAE/g. Am i correct? Can some one please show me one example preferably using my numbers.

Thank you!

send the link i.e formula

Please I am trying to determine the exact amount of biochar that was added to each pot. Please kindly help me check if my calculation is right.

Biochar applied at 20 t -ha⁻¹

Height of pot = 20cm

1 hm = 10000 meter square

Assuming density soil bulk density of 1.2 g/cm³

Volume = 10000 m² x (20cm x 10^-2) = 2.0 x 103m³

m = p X v

m = 1.2 g/cm3 x (2.0 x 10³ x 1 x 10⁶) cm³

m = 2.4 x 10⁹

m = 2.8 x 10⁶ kg

So for 20 t per ha biochar

Biochar = 20 t x 1 / (2.8 x 10⁶ kg/ha) x 10⁶ g

Biochar = 7.14 g/kg

So for 5 kg of soil Biochar added was = 7.14 x 5 =35.7g

Please if my calculations are not right can you kindly assist with the calculations.

I attempt to simulate how the greenhouse gases emission from soil surface under the set of determined crops (e.g. wheat, apples, citrus, sugarcane) depends on geographical position (it is the first step of simulation). The second step must be the analysis of changes because of climate change or irrigation.

Next, I'd like to compare GHG emission intensity with potential yield of crops for various countries of the World. The last is available on the web-site of Global Agro-Ecological Zones v3.0.

Can anyone advice, how I can get the data of GHG emission only from soil surface (but not because of fuel combustion by soil-tilling machines) for the major crops and for different country of the world.

I prefer the description of calcution method rather than ready for use online tools. Online tools often give uncertainties, which I can't trace under the following analysis of results.

I am a novice student doing a research project on water absorption in polymer composites with sodium silicate coating.

I want to ask about how to determine the result of the percentage of water absorption which is the sum of the percentage gain in body weight and the percentage of dissolved matter lost

for example, the conditioned weight is 9.76 grams then the wet weight at the time of immersion for 24 hours is 7.05 grams. Because there was a reduction in weight, my specimen was reconditioned with the result that the reconditioned weight was 6.83 grams.

Is it true that the percentage increase in weight was -27.77% and the percentage of dissolved matter lost was 30.02%? Then to determine the percentage of water absorption, just add (-27.77%) + (30.02%)?

Is there something wrong with my calculations?

please help in that case. thank you

I was calculating refractive index for thin films using Swanepoel method and want to plot a graph of refractive index vs wavelength but as it gives the value in weak and medium absorption region (greater than 600nm), I am unable to plot for wavelength values less than 600nm.

Using COMSOL I am trying to find out modal overlap between TE00 and TE20 mode, only in the core area of a ridge geometry. It will be helpful if someone can provide me any hint to solve it out...  

Hello everyone, I would like to ask if the way that the sample size of this research was calculated is valid or correct. Is a study to evaluate the effect of gargling with Povidone iodine among COVID-19 patients. The text says “For this pilot study, we looked at Eggers et al. (2015), using Betadine gargle on MERS-CoV which showed a significant reduction of viral titer by a factor of 4.3 log10 TCID50/mL, and we calculated a sample size of 5 per arm or 20 samples in total”. From this data of the reduction of the viral titer in a previous study on MERS-CoV ¿It is valid to calculate the sample size this way for a new study on COVID-19?

I have ion molecule, for example, H+ and Cl-.

What is the multiplicity of this ion pair?

What number I have to enter in the multiplicity section in job entry in Gaussian program?

#gaussian #calculation #multiplicity #dft #quantum mechanics #density functional theory

Hi all,

I have a question regarding calculations using the Pfaffl method.

I have 3 groups per experiment: 1 control group (calibrator) and 2 treatment groups with 6 to 7 biological repeats per group.

Although the averages of the delta Ct values both for the HKG and GOI for the calibrator equal 0 exactly, the averages of the corresponding E^delta Ct s do not equal 1 exactly.

The average of the expression ratios for the calibrator thus ranges from 1 tot 1.3 (not 1 exactly) I did not round off any numbers.

Am I doing the calculations correctly or am I making an error somewhere?

I followed this example:

https://toptipbio.com/pfaffl-method-qpcr/#:~:text=What%20is%20the%20Pfaffl%20method,Nucleic%20Acids%20Research%20in%202001.

Thank you for any suggestions!

Marlies

Hello,

I spin-cast two different polymers onto wafers and measure their height as a function of initial concentration. For polymer A, I have the weight-average molecular weight (Mw) as well as the polydispersity index (PDI) and can thus calculate Mn. For polymer B, I only know the number-average molecular weight (Mn). Now I wonder: is it acceptable to calculate the concentration based on Mn, e.g. n = m/Mn and than c = n/V as usual for Mw?

Otherwise I'd give the mass concentration, but that renders the comparison between A + B impossible. What do you think?

Best,

Philipp

How would I know exact pore size of agarose if i make X% of agarose? for example I made 4% agarose then what would be pore size of agarose gel?. Please give your valuable inputs. Thanking you!

I have a 200 mg/ml ampiciline solution, how much should i add to 300 ml of LB medium to get the final concentration of 40 ug/ml?? How much bacteria (in ml) should i add to 75 ml of medium to dilute the culture 50 times??

I'm not working on biomolecules, I work on Organic, Organometallic, and sometimes inorganic structures.

Do you know a simple way to apply the right calculation method? Is there any article or book that has explained how to choose the right method and basis set based on the result we seek or simply based on the structure of the compound?

thank you...

What are the detailed steps to calculate the thermodynamic parameters from TGA curves?

Please give me an idea as to how should the Caussian input file look like if I want to use the (14s9p5d)/[9s5p3d] primitive set of Wachters-Hay with one polarization f-function for the heavy atoms in the system and the 6-311+G** basis set for the C, H, N and calculate the energy using unrestricted density functional theory (UDFT) implemented in the program package Gaussian 09.

I have a calculator with models Casio Fx-9860.I want to create my own lesson formulas as separate menus,For example, I would like to create a menu for the fluid mechanics course and a separate menu for the thermodynamics course.

For example, the user selects the fluid mechanics lesson menu. Choose one of the fluid mechanics lessons formulas from the formulas in the menu

When we select the formula, the calculator takes input from the user and solves the calculator.

Applications are installed on the calculator that have format ( .g1a)

I guess the programming and formula for this calculator has been done with common languages like C or Python because it is designed for this calculator, lots of games (available on YouTube)

Someone can help me to develop a program that has a separate menu?

Does anyone know in what language the formulas were written and how the code was converted to format?

https://www.youtube.com/watch?v=wrPEFUGW_l8

Thanks

When specification limit not known, how we calculate and how we decided the test concentration in RS?

Im supposed to synthesize Ni0.9Co2O4 and Ni0.95Co2O4. I'm gonna use the salts Ni(NO3)2 and Co(NO3)2 but Im confused what the numbers 0.9 and 0.95 next to the nickel means and how to start this calculation. 

Please suggest, how do I calculate the weights of each component?

I have calculated demagnetization factors by fitting Kittel's formula but it seems that the Nx, Ny and Nz values are not reasonable.

Anything in AMBER?

Hi, I’m working on my master thesis, and I would like to explain how the random-forest algorithm works.

I’ve plotted a decision tree of the random-forest and I don’t get how I calculate the Gini-Index and Gini-gain.

First of all, the sample and the values are not the same. This is because of bootstrapping, right?

So bootstrapping gets me from the 1262 samples the subsample-set with the values [514,488,509,505], correct?

The attached file shows the calculation of the gini-Gain of the root-node.

Is my attached calculation of the gini-gain correct? So, for the calculation of the Gini-Index and Gini-Gain I just use the values and not the samples, is that right?

Kind regards Ireno

i have tried to solve this problem myself but i am not sure about the answer i know that is the net charge on FeCl3 is zero (Fe +3 & cl is 3(-1) and for FeCl2 zero too ( Fe +2 & Cl 2(-1) so by using the equation of ionic strength i end up with 1.7 is this answer is correct ?

Hello everybody,

I am trying to calculate the irreducible representation of point group 3m (C3v) for NBT (having R3c space group - 161).

Could you please give some clarification in this regard?

is there any properties that can be determined from the Lab and help calculate cetane number and how?

How does plot good looking publishable bandstructure from VASP calculation.

I have tried p4vasp but we can not modify graph in p4vasp. Any other suitable method for plotting bandstructure from VASP calculation.

I have calculated values using the formula for Kovats retention indices, and my question is how off does my calculation, based on my column (HP-5MS), have to be from the accepted value for a certain compound for me to be able to definitively identify a compound. I used a C8-C20 n-alkane ladder for my calculations. 

For example:

Say that I have calculated and RI of 1005 for one of my peaks, and one of the possible compounds has an RI value of 1000. Is that too far off to possibly consider my compound the compound with the RI of 1000?

A resazurin-based assay was produced with ampicillin against E.coli , negative control was just LB media and E.coli and the positive being ampicillin and E.coli, with resazurin for the readings. Plate readings were taken initially and then every 30 minutes for 2 hours. The only data I have is the plate readings and the initial concentration of ampicillin added. How would I work out the final concentration of ampicillin?

What is the most accurate way of calculating wind direction (2D NESW), wind speed and vertical wind movement using 3D Ultrasonic Anemometer data in the form of uX-uY-uZ m/s (or U-V-W vector) data? I am looking for calculations, methods and/or sources for these approaches.