How can l measure UV and SPF for sunscreen?

28 December 2021 1 1K Report

I prepared zno Nanoparticles how can l measure UV spectra and how l measure SPF factor in vitro and mathematically

Determination of SPF values was calculated by the Mansur equation. After few days storage, the results showed that the pH values and sample viscosity were within the range of values corresponding to the Indonesian National Standard for sunscreen product.

Badges
Science method

More Hoda Elsaeed's questions See All

Error while running WPS-4.2 - metgrid.exe?

Hello Everyone, I am Trying to run WRF-4.2.1 model and facing an error while running WPS-4.2 - metgrid.exe, error is as below: ./metgrid.exe Processing domain 1 of 3 Processing...

29 January 2024 1,573 0 View

Does anyone know what volume of bone marrow is required in a method independent of cell counting?

Hi there, I have got a question We calculate the required sample volume for bone marrow karyotyping based on the WBC counting in ISCN. What volume is required in the non-dependent method of WBC count?

27 November 2023 2,264 2 View

How can we analyze ERP signals in craniosynostosis infants?

Is the difference in variations of specific ERP wavelengths of craniosynostosis patients with normally developed infants would notify a pathology or an expert with clinical experience is...

19 July 2023 8,805 1 View

How to overcome the difficulty in passaging mouse bone marrow-derived mesenchymal stem cells?

Is there a solution to the problem of separating mouse bone marrow-derived mesenchymal stem cells using trypsin? Unfortunately, the trypsin/EDTA 0.25% efficiency in separating these cells during...

25 November 2022 8,701 1 View

How to precipitate strontium in presence of barium?

I want to precipitate strontium in presence of barium while barium is soluble, does anyone have any idea in this regard? Is there any chemical which reacts only with strontium and causes it to...

28 June 2022 4,593 0 View

What is the exact definition for comparability part of the NEWCASTLE OTTAWA scale for cohort studies?

I want a brief explanation for the new castle Ottawa scale for cohort studies. I cant understand the comparability part of this scale

14 February 2022 6,104 2 View

How to prove the property of antifog for aPVA film?

I need way to improve antifogging property for PVA. film compare between glass

15 November 2021 2,000 0 View

method for Antifogging way?

I need to way to antifogging method for PVA film and glass

14 November 2021 5,669 3 View

What are the effect gold layer in PVA Film to make sem ?

After treated PVA Film by microwave plasma take for sem but the film burned so the sugeest is but gold layer for take a picture for surface (sem) so i ask do the gold layer have effect in PVA...

12 November 2021 536 0 View

What is the required time and concentration of glutaraldehyde to make cross-linking to gelatin after freeze drying method??

I make scaffold of 6% gelatin of freeze drying method.. i would prefer to know the suitable required time and concentration of glutaraldehyde to make cross-linking to gelatin after freeze drying

10 November 2021 8,636 9 View

What precautions should be taken while handling S. aureus enterotoxin Type B in the lab?

I would like to understand potential safety concerns while handling SEB in the lab. Especially while working in animal house facility. Would like to know precautions for handling. Sigma MSDS...

07 August 2024 6,033 3 View

How to understand this crystallographic phenomenon of low temperature crystals in zeolite?

During low-temperature testing, new diffraction peaks that appear could be indicative of several phenomena. In one of our tests, we observed notable new peaks around 40° and 45° in a specific...

06 August 2024 726 3 View

Weak DAPI staining after immunohistochemistry - how to improve?

After immunohistochemistry of previously fixed in PFA and EtOH and then frozen 20 μm sections of zebrafish brain, DAPI staining is very weak (right) compared to the same sections stained without...

05 August 2024 9,637 2 View

How to isolate lymphocytes from mouse spleen?

I have tried several times to isolate lymphocytes from mouse spleen, but all attempts have been unsuccessful. I tried most available protocols. I used different dissociation media (HBSS with Ca...

04 August 2024 9,913 7 View

How to draw the five chelate rings of [Co(EDTA)]- on this picture?

Is this circle one of the rings?

03 August 2024 5,988 0 View

Do some Staphylococcus aureus strains have in vitro antimycobacterial activity ?

Some Staphylococcus aureus strains Inhibit the growth of Mycobacteria in Mueller Hinton Agar medium containing 10% OADC. Do some Staphylococcus aureus strains have in vitro antimycobacterial activity?

29 July 2024 10,023 2 View

How do we pick data for determination of Validation Acceptance Criteria?

Hello, colleagues! There is commenting open for new upcoming edition of USP 1033. Validation target acceptance criteria is now different from what it used to be and it doesn't include Cpm....

23 July 2024 7,292 3 View

When I am trying to distill triethyl amine while drying it over calcium hydride. How do I design the setup to let hydrogen escape without losing NEt3?

I am new to research. The boiling point of triethyl amine (NEt3) is 89 degrees centigrade. I am skeptical that when I will let the hydrogen escape which is getting generated in situ, I will also...

21 July 2024 7,283 4 View

Does anyone notice the tumor regression impact of Hepa1-6 cells in HCC orthotopic mice model?

To establish an orthotopic HCC model, C57BL/6 mice (male, 6-8 weeks) were orthotopically implanted with 3x106 Hepa1-6 cells (Over-expressed with a human gene) in 20uL Matrigel into the left lobe...

18 July 2024 9,177 2 View

Trouble finding an anti-Digoxigenin antibody to perform Southern Blot technique?

I'm currently using Roche anti-DIG-AKP Fab fragments to perform Southern Blot assays, but this reagent is delayed since november last year. It's anybody facing the same problem? If so, how are you...

15 July 2024 6,668 0 View