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Questions tagged [lab-techniques]

Questions relating to protocols, procedures, and good practice when using laboratory equipment.

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1answer
63 views

What antibody targets are being tested for in the publicly offered UK antibody test?

In late August 2021 the NHS (UK) offered people who test positive for COVID what is referred to in this BBC report as a “new antibody test”. However, I have been unable to find out what exactly is new ...
4
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1answer
116 views

Why would this viral strain-specific antiserum fail to immunoprecipitate the same (98% identical protein) from another strain?

I'm reading this paper https://www.ncbi.nlm.nih.gov/pmc/articles/PMC392475/ and I can't work out why a certain immune serum didn't work on the same viral protein but from different strains. The serum ...
1
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0answers
21 views

How do I cover Cellstrainers?

I‘m doing some experiments for my bachelors thesis and I‘m using some Cell strainers by Roth for it (https://www.carlroth.com/com/en/accessories/cell-strainer-easystrainer™/p/cly9.1). My problem is ...
6
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1answer
85 views

What's happening in the "C" and "T" stripes of a covid test kit?

I have a COVID home test kit which produces C and T (control and test) stripes when the solution is applied to the strip. Something similar happens in pregnancy test kits. I understand the purpose of ...
1
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0answers
20 views

Sabouraud dextrose agar breaking?

I recently started growing some Geotrichum Candidum (GC) on Sabouraud dextrose agar (SDA) beds. The SDA was poured into sterilized petri dishes. After setting the plates in a cooler (20 C) for a day, ...
9
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2answers
445 views

Tips for longer fragment size and higher purity of insect DNA

Aim In a pilot experiment I tested three different genomic DNA extraction methods on the non-model organism Pieris mannii (southern small white; Insecta, Lepidoptera, Pieridae). The goal was to ...
5
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0answers
31 views

Methods for getting clean C. difficile spore preps without spores clumping together

I'm a microbiologist recently who recently started working on an ongoing C. difficile project for the first time. One of the things I need to do is verify the lower detection limit of my qPCR ...
3
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1answer
63 views

Isolating colonies in a pure culture

I want to conduct antimicrobial susceptibility tests for which I've to culture bacteria first. Since I've bought KWIK-STIKs, (KWIK-STIK contains a single lyophilized microorganism which have to be ...
5
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0answers
36 views

dilutions in bacterial culture

In overnight bacterial culture, why do we put bacteria in a small flask to culture before moving it to a larger flask? Why not just put the sample in a large flask to begin with? This is in reference ...
2
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1answer
28 views

Washing buffers for protein identification?

I am currently learning protein identification techniques and come across ELISA and Western Blot. In these methods, a washing buffer is required to wash out the antibodies that are not bound to the ...
2
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1answer
58 views

Procedure of diagonal electrophoresis

I am learning protein sequencing and it seems that diagonal electrophoresis is a common method in the identification of disulphide bonds (S-S) exist between polypeptides in a protein. Questions: ...
1
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1answer
36 views

How to identify plasma cells that only produce monoclonal antibodies?

I am studying the procedures of forming hybridoma cells for generating a large number of monoclonal antibodies. Before the procedure of fusion (with multiple myeloma cells) happens, I would like to ...
6
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2answers
78 views

Which method of gene amplification for toehold switches?

My team and I are from a high school and are planning to carry out some research investigating some toehold switch riboregulators which we have designed in silico. However, we have little experience ...
0
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1answer
40 views

Is there a scale suitable for continuous tracking and recording of plant weight?

I want to measure water transpiration and evaporation in a bonsai tree, and measuring the weight of the tree in its pot is my proxy for water usage. This has worked well with manual measurements, but ...
1
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1answer
46 views

Can GFP reporting be used to track localization of peptides in the ER, Golgi, and plasma membrane?

Suppose I want to study the trafficking of a peptide throughout the ER, Golgi, and plasma membrane. An idea I had was labeling a secreted or plasma membrane integral protein with GFP and using time-...
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0answers
71 views

How can I clone a gene into a plasmid vector with an N-terminal his tag and TEV cleavage site between the tag and the start of the sequence?

I'm a scientist who has significant experience in chemistry but am relatively new to molecular biology and biochemical techniques. I'm trying to make an isolated domain of a protein (166 residues, 19....
0
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0answers
48 views

What is special about Pulse-Amplitude-Modulation (PAM) fluorometry?

I know that PAM fluorometry is used to measure chlorophyll fluorescence and understand the principle of those measurements. It is in principle clear to me from prior research in the literature, that ...
0
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1answer
106 views

Enzyme inhibitor leads to higher turnover rate?

I'm currently working on a project where I have to deal with enzyme inhibition. The purified enzyme shows a good substrate turnover. When I try to inhibit it with different inhibitors described in ...
4
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1answer
154 views

Alternative dyes for Gram staining

In the Gram stain, is there any replacement for primary stain, secondary stain, decolourizer and mordant? What results will the replacements produce? I found that crystal violet can be replaced with ...
3
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3answers
94 views

How pricey does the media need to be for a typical bacterial culture experiment?

I'm considering various lab supplies for a protocol we're going to be running, and have been struck by the remarkable difference in price for different quality levels of the same basic substance. ...
5
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3answers
178 views

Saturated Mutagenesis Screening

I am hoping to mutate the active site of the enzyme I am researching that has 5 residues in proximity with the substrate. I am wondering how many colonies I'll have to assess to theoretically sample ...
9
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3answers
168 views

Assembling small DNA parts using Golden Gate

Background I've always been told that DNA assembly can be tricky when using very small DNA parts due to low efficiency. I've also seen this when using 3A biobrick assembly to assemble promoters and ...
5
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1answer
51 views

How standardized is lab-grade skim milk?

I was surprised to learn in the answers to this question that in many cases the preferred cryoprotectant for many organisms is skim milk, rather than something more simple and well-defined like ...
7
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4answers
303 views

Measuring luminescence in a fluorescence plate reader

We're considering organizing some interlaboratory work on calibrating luminescence reporters (e.g., luciferase), and one of the key questions I don't know the answer to is whether most plate readers ...
15
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2answers
3k views

How long will a typical bacterial strain keep in a -80°C freezer?

I know that a -80°C freezer is the recommended means of long-term cell-line storage, and that cells will typically not last long in a -20°C freezer. But how long will a typical bacterial strain (e.g.,...
2
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1answer
95 views

What does it mean to "cure" microscope slides?

I am reading a journal paper and I have come across the following statement in the materials and methods section regarding the preparation of microscope slides: Coverslips were washed once more with ...
20
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4answers
2k views

Pipetting: do human experimenters need liquid class information?

I've been working on a protocol standardization project where, among other things, we want protocols to be able to be run equivalently by both humans and robots. Something that I've noticed in doing ...
0
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1answer
48 views

What is meant by 4 –12% or 8% SDS-PAGE?

I am reading a journal paper and I am looking at the materials and methods section. Regarding the Western blot method in the paper, I have come across the following statement: Proteins were separated ...
2
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1answer
50 views

Why when measuring turbidity do we use the minimum wavelength?

As a preface, I read a few other related posts and was able to gather some knowledge, though without any background in physics I am having some trouble here piecing together a coherent view. I looked ...
0
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1answer
48 views

Is there any reason to use an upright microscope over an inverted microscope?

I've never actually owned an inverted microscope, but it seems it has only advantages compared to an upright microscope: taller, heavier samples; no crashing the objective into the glass slide; easier ...
1
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1answer
30 views

Reliable recipe to make DIY yeast slants

Does anyone have any good ideas on a reliable way to activate basic grocery store yeast? I realize this is a total beginner's question. I've built a small yeast ranch at home with my kid, and we're ...
0
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0answers
14 views

Why is transferrin saturation so low?

Transferrin Saturation (TS) is a common laboratory test and its values can be used to diagnose a variety of medical conditions. In healthy humans, and I assume it is the same for other species, TS is ...
0
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0answers
42 views

What statistical test would you recommend to compare two animal behavior sampling methods?

I am doing a lab where I am comparing the scanning method and focal animal method. Each method will give me the following: Scanning method: occurrence frequency for each behavior (%), focal animal ...
1
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1answer
20 views

When should I use cryofixation and chemical fixation?

We know that the technique used in TEM sample preparation involves multiple steps, one of the most important of them is fixation. Fixation can be of two types: Cryofixation, that suggests that the ...
0
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0answers
21 views

How to do manual Saccharomyces tetrad separation with minimal equipment?

I would like to separate the four ascospores from individual asci by manual microscopic manipulation without at micro-manipulator and a basic dissecting microscope capable of 600X total magnification ...
2
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1answer
84 views

Decreasing signals in assay measurements

I'm working with a calcium assay to study the effects of different virulence factors. The assay works, but from day to day the signals of cell lysis go down. Unfortunately, I haven't found an ...
2
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1answer
42 views

How to attract Cyanobacteria?

I would like to attract cyanobacteria in one spot on an object (e.g. cloth,) instead of having it swim in the media. my current method is to pour it on the object in a beaker and wait for some of them ...
12
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4answers
2k views

Are bleach solutions still routinely used in biochemistry laboratories to rid surfaces of bacteria, viruses, certain enzymes, and nucleic acids?

Decades ago I would stop by biology and biochemistry laboratories to see what was up, and I noticed a ubiquitous presence of a squirt bottle of bleach solution. When I asked what it was for I would ...
0
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0answers
18 views

question on brain dissection

I was dissecting a sheep's brain for my students and one of them asked a question about the corpora quadrigemina he asked why did two of them(the superior colliculus) look more red than the other two ...
2
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0answers
68 views

Does glycerol in E.coli culture media somehow inhibit the lac-operon?

I have have been taught that one should induce protein expression with IPTG at an OD of about 1.0 - 2.0 when E.coli grows it TB media (terrific broth). As a reference point, one typically induces ...
0
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1answer
52 views

bunsen vs meker for best sterile field [closed]

I need one bunsen and i have a friend that sells me a bunsen-meker burner. I see that bunsen-meker burners have more flame diameter, so should have more diameter of sterile field, but i dont know XD ...
2
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1answer
299 views

1% water solution of deoxycholic acid. How is it prepared? [closed]

According to Sigma, the solubility of deoxycholic acid is: 0.24 g/L in water at 15C According to the FDA, Kybella (trademark) is a 1% water solution of deoxycholic acid. How did they do this?
3
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0answers
39 views

Why is my DNA band bulging?

This is the only image my the TA was able to get for us. And, we're using it for our lab report. The image isn't even ours. It's another group's image that we're sharing. But I don't understand why in ...
5
votes
1answer
41 views

Is there a biological or technical reason for a 40 Ct cutoff in nucleic acid detection assay?

I have developed and validated a modified a nucleic acid test (NAT) for SARS-COV-2 detection using real-time RT-PCR (aka rRT-PCR, aka RT-qPCR). My assay is not for diagnostic use, but for donor ...
1
vote
1answer
19 views

Low-tech or low-cost technique for quantitative estimation in enzymology

If an accurate measurement of enzymologic quantities is needed, then following established methods in the field is necessary. However, it is sometime of great usefulness to ballpark a value before ...
4
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3answers
115 views

Book recommendation: protocols and recipes handbook for molecular biology / biochemistry

I'm a 5th-year PhD student in chemical biology. I've mostly been doing computational work, so my bench skills are rusty. To help me, I'd like a handbook of common techniques -- transformations, ELISA, ...
0
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1answer
50 views

Coronavirus and temperatures

An article on bioRxiv, Evaluation of heating and chemical protocols for inactivating SARS-CoV-2, recommends certain treatments to inactivate SARS-Cov-2 for lab work. The abstract notes: "Although ...
17
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3answers
2k views

Why does an autoclave need to pressurize steam?

I've looked this up on other sites and they say that an autoclave needs high pressure in order to raise the boiling point of water so that you can achieve steam of a higher temperature. If you look ...
0
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1answer
21 views

How is in-vitro fertilization technically achieved?

I failed searching on Google technical details about how in-vitro fertilization is achieved. I'm referring to the toolset and its use, rather than the chemical or biological aspects of the process. I ...
1
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1answer
36 views

How does the choice of blood draw site influence the possible specificity of a serological test?

The news has reported that a new serological test for the presence of anti-SARS-CoV-2 antibodies has received an emergency use authorization from the FDA, and notably has a higher specificity than ...

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