Questions related to PET
I would like to incorporate micro-capsules in Melt spun PET filament. As we know Melting point of PET is >260C. What micro-capsule coating material would be suitable for this process? Also are there ways to reduce melting point of PET for yarn formation without changing its properties ?
I received this question from a reviewer:
Among different metal ions and anions, why Question: the chemosensor exhibit high selectivity towards Cr3+ only?
The chemosensor I used to detect Cr3+ ion is a Schiff-base, and to the best of my knowledge, the related papers do not explain clearly the reason why a molecule is a selective sensor towards a specific ion.
So, my response the following:
"The sensing mechanism and selectivity towards Cr3+ can be supported by computational calculations, which estimate the sensing capability of molecules mainly basing on intermolecular interactions and compatibility between ion size and the geometry of chelating site. Hence, the selectivity observed for Cr3+ ion can be explained by its interactional and geometrical affinity to the chelating site."
Despite our response, we received a second revision in which reviewer is asking the same question!
Anyone can help me please!
Waiting for your responses.
I am looking for reflectance, transmittance and absorptance data for some transparent polymer materials (e.g. PE, PET...). I found this reflectance calculator https://www.filmetrics.com/reflectance-calculator where some data is available.
What is the role of "medium" and "substrate" in that calculator?
I choose for example air as medium and substrate, and PET of 250 nm in the midddle. The absorbance plot looks weird in that case: at the wavelength >300 nm absorbance = 0.
For PE it is just 0 for every wavelength, so a strait line. Im I choosing wrong medium and subbstrate? The idea is that the material is used as a wall of a e.g. greenhouse or some other constuction, so it is indeed surrounded by air.
I've got all Dicom files of a dynamic PET scan, but I cannot get the single volume of each time point and calculate the SUVbw. Are there any solutions that can split the diocm files into individual volumes in Nifti format and compute the SUV for each volume?
I have seen many veterans who have been exposed to severe shock waves from artillery fire. Their MRI of the brain are showing some "non-specific" changes, but there history is very typical of prolonged post-concussive syndrome and even CTE. There are tens of thousands of veterans with this condition. They are not being properly diagnosed and treated. As far as I am aware of, besides an MRI study done at Walter Reed Hospital there are no other studies using more sensitive tests, such as SPECT or PET.
When we think about stroke, we always think of loss of function. However, there is no reason to not have a gain of function after a stroke. I believe the Japanese are looking into this very closely and I have come across anecdotal evidence for the same. This possibility can be the result of two processes. We know that around the age of 2, there are more synaptic connections than in the adult brain. PET scanning has also shown that at that age the brain has the highest metabolism ever in a person's lifetime. At the same time there is a lot of "pruning" occurring in the white matter. This pruning, though is being done in a very controlled manner, is nonetheless not different to the injury that occurs from a stroke. The other possible way for the gain of function after a stroke is to consider the CNS as a system. When a damage occurs to a particular area and we see a loss of function, it does not mean that the deficit was the function of that injured area. We can look at this system wise and say that the deficit we are observing is the coping mechanism of the remaining intact system. In this way, an injury can result in a gain of function of the remaining intact system. One famous example is that of Demosthenes, the great Greek orator. He used to stutter, but when he put some pebbles in his mouth his speech was fluent and he was known for his oration. In this case we clearly see how the system is able to overcome a deficit by employing different circuits. If the articulation was localized to a single area that was not functioning well and causing the stuttering, then putting pebbles in the mouth would not have helped Demosthenes. Thanks.
At what AAA size would you consider Cardiac Nuclear PET/SPECT with Lexiscan over Dobutamine Stress Echo? (outpatient setting)
How important is the potential for a hypertensive blood pressure response with use of Dobutamine?
How important is the presence or absence of a previously placed graft?
What are other clinical factors on which you would base your decision?
-comments greatly appreciated!
Deborah Williams, NP
Positron emission tomography generally shows imaging of the physiology of the tumor as well as its anatomy, which is superior. It is unique compared to other cross-sectional imaging such as computed tomography or computed tomography (CT) or computed tomography. CT scans or MRIs often can not detect changes at the cellular level if the PET scan is capable of immediate changes. Identify in patient cells.
In order to image the tumor using PET or other methods, differences in basic features established in physiological and Metabolic of tumors and normal tissues. These differences include tumor surface antigens compared to cell tissues. Generally grow and DNA precursors such as thymidine and the rate of protein synthesis in tumors often increase compared to normal tissues. transport and Mixing of various amino acids, as well as anaerobic and aerobic glucose levels, are observed in tumor cells. In a wide range of Tumor types Glucose intake increases significantly compared to healthy tissues. In a typical PET system they are separated by a lead or tungsten blade detection of random photons in one shot Match with photons detected in other shots. In the diagram below, I plotted the average positron emitted energy from several desired radionuclides. Which of these radionuclides is best for our purposes?
I'm trying to measure TEER of HK-2 cells cultured onto collagen IV-coated PET inserts of 0.4 um2 pores. Nevertheless, when I measure the blank resistance I get a value that I think is too high (about 365 ohm). Is there anyone who did this measurement before that got a similar value?
I ground the PET film into fine powder. Grinding was done in constantly cooled environment using liquid nitrogen. Upon doing DSC, I observed that the crystallinity of the powder (sieved to different size ranges) increased over decreasing size range. What is the explanation of this? Thanks
I try to prepare activated carbon from PET bottle but in many scientific articles mention the use of N2 atmosphere in pyrolysis. However, I only have Ar atmosphere available. Has anyone ever tried this in this atmosphere? Because it doesn't work for me in this atmosphere. Could it be besause of this atmosphere or temperature? I used a temperature of 500 ° C. Thanks for any answers.
do you know about any commercial service which offers CryoMilling?
We have a few samples of plastics (including e.g. PET) and soils, which we need to cryomill, but since we do not need this service regularly, there is not so useful for us to buy a cryomill.
Thanks in advance for suggestions,
(The image is from http://4.bp.blogspot.com/-aek5e1i0MFA/UB9EYKPXGDI/AAAAAAAAAow/au27uSYHJ3Q/s1600/IDENTIFICATION+OF+POLYMERS.jpg . Cannot post here for copyright issues)
The simple polymer tests in that image incited these questions to me-
- Why would red-hot copper wire burns with Green flame when polyvinyl chloride (PVC) is burnt on it but orange flame in case of polystyrene (PS) and polyethylene terephthalate (PET)? Is the HCl generated from burning PVC generates Cu(II) compounds upon reacting with copper in case of PVC, but not in case of PS or PET? But doesn't Hydrogen have higher reduction potential than Copper (EMF series), and copper may anyways oxidize in air at high temperature to provide a green-blue flame?
- Why acetone reacts with PS but not PET? Acetone's (propanone) central C atom is not as much electropositive as methanal (formaldehyde), but still it can undergo nucleophilic addition. But while one alkyl group (ortho-para substituent) enhances electrophilic substitution reaction tendency in case of benzene ring of styrene in PS, two carboxylic groups in terephthalate causes benzene ring to be deactivated for electrophilic substitution in PET. Is this reasoning okay or is there anything wrong with it?
I have 9 positron emission tomography (PET) images of a patient, taken at different times. I want to calculate total disintegration (cumulated activity) but I don't know where to begin.
Has anyone came across this topic before? Is there a practical reference or step-by-step guide to it? What tools do I need?
Thank you for your time and attention.
cell culture plates usually are of two types on the basis of the materials used in construction: PolyCarbonate(PC) and Polyethylene Terephthalate(PET)...what's the difference between them in terms of application and quality?
The European Parliament has approved a ban on single-use plastics by 2021. Currently there is a growing concern about the environmental and health issues caused by plastic and micro (nano) plastics wastes. This ban approved by the European Parliament means a scientific and economical challenge for both plastic industry and society in general, so I would like to discuss some points about it with the RG community.
Which could be the best replacement materials / products or perspective to adopt on the single-use plastics issue, which nowadays are everywhere in the daily life? Are we scientifically / technically prepared for these changes? I also would like to know if there are new proposals to deal with this challenges, and of course, deal with the existing contamination of plastics and micro (nano) plastics.
May I ask if there any ideas to fix the PET film on the glass substrate for nanoindentation test? Because PET itself is not able to attach to the substrate, if we fix the film only by using tapes adhere on four sides of the square shape glass substrate, the film might dislocate during indentation causing the results to become inaccurate. Your ideas and suggestions will be much appreciated. Thank you
I have some files about PET-DAT in patients, having parkinson disease. And I use spm12 implemented in matlab15b for coregistration and spatial normalization of images and voxel-based comparison. But I do not know how to measure regional uptake values for region of interests, like putamen, caudate.
Can you offer some methods and Suggestions？Thank you very much for your help.
I have RM-BOD (biochemical oxygen demand) bottles with part number D1001 purchased from environmental express. They are disposable and made of PET resin. Are they suitable for preserving seawater samples for pH/Alk measurements?
Thank you in advance.
I am currently trying to make TADF OLED devices with graphene as an anode. I transfer graphene to PET substrate and dope it with HNO3. During the I-V measurements, I saw some sparkles and i cannot continue the measurement because of it breaks down. I think it is related with hole injection process but i cannot find a solution.What can i do to solve this problem?
I made the PET/PLA blend in our lab. Now I need a solvent for PET dissolution of this blend. Does anyone know solvents that dissolve PET and do not have any effect on PLA?
We want to show the surface changes to PET and PLA plastics (in pulverized form) as a proof of the UV treatment. From what I understand ATR is useful for spectral analysis of a solid, but I read that it cannot be used for "hard" polymers/powders. Are PET and PLA compatible with this method or is there something else I should look into?
Hi everyone, What are the best additives to decrease crystallinity of PET? I want to provide transparent sheets with 1cm thickness.
I have been looking for journals and books online about the topic of Tracer kinetics. Most text have information on PET systems . However, I have yet to come across text on tracer kinetics in non PET systems. Please do assist in the form of journal articles. Thank you!
I have just cloned my gene into pET and would like to check if my gene is in frame.
Can I just translate my sequence and then do a protein blast is that a proper way of doing it?
I actually have a question regarding bacteria detachment.
I am trying to detach E. coli bacteria from my polymeric surface after incubation the sample in bacteria suspension for 1-2 hours.
as I searched using SDS will help
after 1hour of incubation I took out the sample, rinsed in PBS 2 times to remove weak bounding and then covered the sample in 0.04% SDS solution and vortex for 30min at 1300rpm in 4C temp. At the end take out the sample and then harvest the cells for counting and optical density measurement..
I have designed a flexible PET antenna at 16 GHz operating frequency in HFSS, which confirms the resonant point at 16 GHz. However, after printing using DMP 2831 inkjet printer with silver Nano inks and ensuring the better conductivity after sintering when I tried to measure the S parameters, I found that the resonance frequency shifts to 11.5 GHz from 16 GHz with -15 dB of return loss, whereas the simulated result was -40 dB. My design frequency is 16 GHz, however, the dielectric constant and loss tangent that I used based on 10 GHz (3.2 and 0.022) for Mitsubishi’s NB-WF-3GF100 PET film. Since PET has single sided coated surface I printed radiator and ground plane on the same side of the substrate and used waveguide port.
I am completely screwed up. Please advise me how I can rectify this problem?
I am interested in doing an ROI-based analysis of ADNI FDG-PET data to examine regional metabolism in their control group. I am using a coregistered volumetric MRI to create anatomic ROIS and exporting these as masks to use on the PET data. Since I'm using ROIs created from each subject’s own MRI scan, is it still necessary to do a partial volume correction, or is that something you do only if you’re warping everyone’s images into a common space (e.g. MNI)? And, if I need to do partial volume correction anyway, is it a reasonable alternative to simply erode each MRI-based ROI mask by 1 voxel all around to avoid the issue, instead of doing a more complicated partial volume correction method (e.g. segmenting a coregistered MRI image, calculating a CSF dilution factor and then correcting the raw time-activity curve of the PET in each region)?
The fluorescent dye NILE Red had originally been used for staining of hydrophobic compounds like lipids. In the last years, NILE Red has been tested and proposed for the staining of microplastic particles of polymers like PE,PET,PS etc. I was wondering what interaction leads to the intercalation of NILE Red with those carbon based polymers on the molecular level?
Please let me know how to distinguish the quenching due to PET, FRET and Inner filter effect???
I have a multilayer film (A/B/C/PET/PE). PET and PE are the last layers. I want to laminate this multilayer film to another PE film in a PE to PE manner (A/B/C/PET/PE-to-PE). The lamination is not working properly. What could be the cause? Can PET affect the chemistry of PE
I have to measure the thickness of a coating on PET fabrics.
I'm trying to use Imaging ellipsometry, but I'm realizing it is quite hard.
Thank you in advance
I would like to determine the actual light transmittance of the three types of PET bottles that I am experimenting with. Any ideas on how this can be done without using the usual Light Transmittance Meter? Any laboratory within the SADC region that has capacity to determine light transmittance of PET bottles?
I need normal FDOPA brain images to run a simulation can generate dynamic PET data where it is using input function from real FDOPA images. Plus, we could make a template to be a reference for further analysis. Can anyone please help me finding these? any help is appreciated.
Looking forward to hearing from you,
We need to register neuroimages to test our neurodiagnostics sofwtare. Which apps or websites are you using?
I want to coat metal alloy on PET and PC sheet using Thermal vapor deposition. i have tried number of trials but there is no good adhesion between polymer and metal. So Please suggest your ideas.
There are different types of diagnostic tests for Alzheimer's disease. as far as I know, one of them is positron emission tomography (PET) scanning. what exactly does cause the sign of the disease on a PET image? what percentage of Alzheimer's disease can be diagnosed by this procedure? do prescription drugs affect these signs after we take the test again?
How can I get uniform ZnO seed layers on ITO/PET surface after cleaning through sonication by using isopropanol, ethanol and d.i water ?
I saw the Wettability of ZnO seed layers is not perfect on the ITO/ PET substrate. How can I improve, can anyone suggest me ?
The goal of this Simulation is to validate the Numerical simulation method .
I am doing Stretch blow molding Simulation for water bottle with Abaqus using the real process settings.
The problem is, rate of expansion of preform is too high in simulation compare to the real process video ( we have developed the transparent mold !!) . the cavity pressure and end shape matches perfectly with the real process. but, the inflation is not matching throughout the process.
it would be very helpful if someone can put an ideas in answer section
I would like to make a mixture of a smectic liquid crystal, with some kind of polymer, cure it in UV, and create a PDLC between two PET coated ITO.
Is it possible? if so, what is the smectic i should use, and the same for the polymer for good optical and adhesive properties?
I wish to deposit gold thin film on PET substrates using magnetron sputtering. Since these substrates cant sustain high temperatures, i like to know whether these substrates can be mettalised using sputtering.
I need opaque white PET films, about 0.2 mm thick with hydrophilic surface. Are such films used in any other common process ? Can anybody suggest a source to get these at cheap rate for population survey for hemoglobinopathies in rural India with low budget by thin layer agarose electrophoresis ?
The Standardized Precipitation Drought Evapotranspiration Index (SPEI) requires a Di term of the difference between precipitation and potential evapotranspiration (PET) on a weekly or monthly basis. I have Di for my 17-year time series, where each day of the time series represents ~1,000,000 30x30 meter squares in a city.
The formula for SPEI is attached and is straightforward. This should be easy to calculate in Matlab. W is -2ln(P), and P is 1-F(x). I don't understand how to calculate F(x). I read that to calculate F(x) I could fit the log-logistic distribution to the Di time series, but when I tried in Matlab this didn't work due to negative values (which are common since Di is Precipitation-PET).
Since the whole purpose of the math I attached is to standardize Di, would it be appropriate for me to detrend the time series and then to find the z-score? I could do that very quickly.
Any input on how to calculate F(x) would be appreciated.
How to make homogeneous metal oxide (TiO2 ) paste on PET/flexible plastic substrate for perovskite solar cell applications.
Hi, I have grown primary nasal cells on semi-permeable trans-well (PET) inserts and would like to prepare a slide (for confocal microscopy). I imagine it has to be fixed and cut out and placed on the glass slide. Does anyone know how to fixate it on the slide without it moving around so its possible to stain it ?
Your help is much appreciated.
Power Electronic Transformer concept have various advantages over conventional transformer..I wish to know whether PET concept is implemented in India by Public or Private Power sector electricity company..
Prices for plastic types like HDPE, LDPE, PET, PP, PA6.
I would like to compare the prices for primary and secondary material.
Thank you very much!
Hi, I'm young jin Hwang from hanyang university
I made GZO solution using sol gel method.
I coated GZO and AgNW on PET substrate using spin coating with 1000 rpm .
Finally, I made GZO/AgNW/GZO transparent electrode structure.
Using 4 point probe system, I measured GZO/AgNW/GZO electrode.
But It didn't measure.
Using Non contact resistance system, It measured 100 ohm/square.
I want to know why it didn't measure using 4 point probe system.
pleas reply~~ please I want to know why.
I have monitored streamflow, rainfall with another meteorological variable. While trying to do water balance of the catchment (Himalayan) following the equation P-Q=ET, it is not fulfilling the above equation. ET is being calculated using the PM method.
I am not able to find out the reason behind it. Can you please let me know the things that can be done.
Is there any problem to use ET or else I have to use actual evaporation. Please suggest me the conversion factor if any from PET to actual evaporation.
Some researchers such as P.C. Beard had utilized Polyethylene tereepthalate(PET) film as the sensing element for ultrasound detection, but the sensitivity and bandwidth are both confined. Is there any other good method or improved means to detect ultrasound to reach to sensitivity limit and a larger bandwidth?
What are the best candidate molecules for in vivo radiotracer (PET) imaging of aggregated alpha-synuclein? Are anybody aware of candidate small molecules, antibodies or small peptides which have been successfully labeled with radio-isotopes and tested in e.g. animal models or post mortem human brain tissue and shown promise (i.e. specificity for alpha-syn over beta-amyloid and tau protein)?
I am looking for an ESL placement test that covers CEFR Levels A1 to B1. I have already considered PET and KET, but they cover a different range. Can you help?
Is there any open source software for simulating or calculating runoff using Monthly Rainfall, PET and Soil information of an area?
In cognitive state detection and analysis. We analyze spatio-temporal brain data from MEG, fmri, PET, EEG and so on, to detect the brain cognitive states. We need to know which one of these neuroimaging techniques gives us more information. If there is a Convincing evidence on choosing one of neuroimaging techniques. fmri, MEG, PET, EEG, or what ?
How will you calculate the solvent percentage from 1H NMR. for example pet ether shows 2 protons at 1.26 ppm so how will you calculate the percentage. Mol. Wt. of product is 476.236
I need to deploy a membrane integrity test (bubble point test) for radioactive "vented filters" (Millipore Cathivex - PVDF - 0.22 µm - 25 mm) used in the terminal sterilization of radiopharmaceuticals.
My main problems are:
1 - mannipulation of radioactive filters (automatized procedures are desired);
2 - seal the vent (I have a Palltronic Starflow for performing of the integrity test. But I need seal the vent of filter, and this is a problem. How I can seal the vent?).
Since now I thank for the help.
My best regards,
I am expressing a 37 KD protein in E. coli BL21 DE3 by Pet 26b vector. How can I reach the highest level of secreted recombinant protein.
I need the secreted soluble form for better purification and not going to lyse the cells due to endotoxin release. just need to reach the highest protein level in the medium.
Should I change my cell line to a commercial one? If yes what is the best option?
what is the best medium for reaching high levels of cell density in log state?
I have PET type of pouch case for Li-ion batteries. It seems that Al and Cu tabs do not stick well with PET. I use vacuum sealer and the sealing temperature is not controlled by user. Commercial hot melt adhesive tapes didn't work for me. What type of adhesive tape I should use?
Thank you for your suggestions.
I have got a fabric from china mentioning the composition percentage as- 86% PET and 14% OP. I know the meaning of PET but facing difficulties to know about OP. Could anyone suggest any information about OP?
I'm trying to find out whether a movement-based music therapy affects the dopamine level of patients with Parkinson's disease. I would measure the dopamine level in patients' brain by a PET scan, but I haven't found an article that would specify what exactly 'normal dopamine level' means, what the specific numbers, units are, and how quantitative PET data are analyzed. I'd really appreciate it if someone could help me out and point me in the right direction.
Are there any citable data, about how much of polar fleece [AKA polyester fleece, micro fleece, polar wool, vega wool, velo vool, plush, velours, Vlies, Plüsch...] fiber products [typically blankets, outdoor clothing, carpets, etc.]. are made of poly(ethylene terephtalate) [PET] and how much are from other poly(esters) [if any] ?
For the development of a PET-tracer targeting PDL1, we are looking for small molecules (MW <500) with high affinity (Kd/Ki < 10nM). Can anyone suggest a good lead or reference? Does anyone have personal experience with such molecules?
Hello, I am trying to functionalize PAN filterpaper (PAN microlayer on PET) with some Amino group? Is it possible? APTES will work for this purpose? Ideally I would like an aromatic amine functionalization.
I am facing a problem in measuring intrinsic viscosity of PET using O-chlorophenol solvent and Ostwald viscometer. It is giving me different flow times when measured at a single time, even with solvent alone. I used chromic acid to clean all the glasswares. Can anyone suggest me any possible reason for this?