30 Questions 104 Answers 0 Followers
Questions related from Mohammad Issawi
In general, plants host endophytes (bacteria and fungi) depending on phenological conditions. Stinging nettle (Urtica dioica) has been widely recognized to be associated with endophytes and...
10 October 2019 7,859 6 View
Which is more reliable to: 1) identify the target site of a drug? (maybe metabolomic approach is more consistent here) 2) study physiological responses of biological systems upon drug toxicity?
07 July 2019 10,057 3 View
Is there any report on the use of LnRNAs as gene silencing tool?
03 March 2019 6,207 9 View
α -tocopherol is the major vitamin E present in green plant tissues, more specifically in the membranes of chloroplasts and thylakoids. I performed many protocols to detect and quantify α...
12 December 2018 865 19 View
Dear researchers, What are the black structures that appear on Botrytis cinerea mycellium after two weeks of in vitro culture?? I tried to observe them under binocular microscope and I think that...
08 August 2018 1,859 13 View
How can we determine which pathogen (bacteria, fungi, virus) is responsible for a given plant disease from a phenotypic observation (for example: spots, smudges on leaves) ??
07 July 2018 8,941 14 View
What are the conditions in which organometallic compounds (porphyrins, phtalocyanins) loose their coordinated metal?
06 June 2018 6,266 0 View
Testa is the outermost layer of plant seeds. It protects embryo from bacteria, fungi as well as abiotic factors. How much is the testa thick ?? (need value in µm) Thanks
05 May 2018 3,490 3 View
Plant cuticles are hydrophobic solid-state lipid layers containing waxes, cutin and small amounts of some polysaccharides (cellulose and pectins). they play crucial role in evaporation prevention,...
03 March 2018 1,303 3 View
Normally, biological assays are based on "population-averaged" analysis then an assumption has to be made relying on the fact that the average reflects the dominant biological process occuring...
03 March 2018 6,734 9 View
The clones obtained from embryos (grown in virtro) of douglas fir are significantly differents although they were derived from somatic embryogenesis and grown in the same conditions?? Does anyone...
03 March 2018 7,883 5 View
A toxic compound can interact with DNA by intercalation or groove binding then leading probably to DNA damage (cleavage). Does DNA interaction without any damage mean "genotoxicity"?? or DNA must...
03 March 2018 1,690 14 View
What are the differences between stokes radius, radius of gyration and hydrodynamic radius ?? and how can they be measured (size exclusion chromatography, DLS, SAXS) ??
02 February 2018 1,290 8 View
Pre-emergent herbicides kill weeds before emergence from soil whereas Post-emergent ones eradicate weeds that have already emerged from soil. What is better herbicide to use? pre-emergent or...
02 February 2018 4,367 24 View
How hydrophobic polymers as cellulose and lignin can be used as efficient nanoparticles for poorly water-soluble agent delivery in aqueous environment (blood, extracellular fluid, in vitro...
02 February 2018 1,988 4 View
what is the relation between concentration and chemical stability of a solution? the more concentrated the solution, the more stable it is or it is the opposite??
02 February 2018 4,961 5 View
What is the molecular weight limiting of molecules that can across lipid bilayer membrane??
02 February 2018 4,795 11 View
Zinc-tetrakis(4-N-methyl pyridyl)porphyrin has an absorption soret band at λ=437 nm whereas λexcitation=458 nm. ( λemission=640 nm). How can we explain this difference??
02 February 2018 5,916 13 View
What are the differences between anhydrous and hydrate forms of inorganic salts (AlCl3 , MgSO4 ...) in term of their use for biological applications (ex: in vitro culture) ??
02 February 2018 3,260 7 View
what are the differences between normal incandescent blue glass lamp and blue LED and blue LASER ?
01 January 2018 6,023 7 View
Current statement concerning plant transgenesis research in Europe?
12 December 2017 1,388 3 View
Tocopherols and Carotenoids are two major lipophilic antioxidants in chloroplasts. I am wondering why they are exclusively synthesized in photosynthetic tissues (in chloroplasts) and cannot be...
12 December 2017 3,221 3 View
Deuteroporphyrin dimethylester (and not deuteroporphyrin dihydrochloride) is hydrophobic and cannot be dissolved in water. what is the suitable solvent to dissolve it?
12 December 2017 425 6 View
When I recorded the absorption spectrum of the free base 5,10,15,20-tetrakis(4-hydroxyphenyl)porphyrin (THPP) dissolved in NaOH at 2 µM, I noticed that there is two bands Q instead of four. Is...
12 December 2017 8,648 2 View
Pectin polysmers are integral part of plant cell wall forming gel matrix in which are embedded cellulose and hemicellulose. It is well known that pectin polymers form gel at low acidic pH less...
12 December 2017 1,579 4 View
Normally, lignins occurs in hight amount in the secondary plant cell wall. however it can be present in primary cell wall under some defined conditions (such as suspension cells growing under...
12 December 2017 1,602 5 View
Dear researchers, Recently, Researchers have succeeded to capture high resolution image of a molecule showing clearly its shape and chemical bonds through atomic force microscope (AFM)!!! (see...
01 January 1970 4,824 5 View
Hi As far as I know, ascorbate peroxidase enzyme (APX) is the major enzyme involved in H2O2 scavenging. It is specific to plants and algae. Recently, I was shocked when I came across an article in...
01 January 1970 9,366 8 View
Hi Is there a real correlation between % of cell death and the efficiency of DNA fragmentation assay? I want to perform DNA laddering from suspension cell sample with low % of dead cells (less...
01 January 1970 484 3 View
Dear researchers, What do you think about Roundup herbicide that caused cancer to a gardener who decided to take the chemical giant (Monsanto) to trial?? The jury agreed that Roundup contributed...
01 January 1970 1,018 29 View
