What's the difference between formaldehyde and hexamine?
Formaldehyde
Definition:
(n.) A colorless, volatile liquid, H2CO, resembling acetic or ethyl aldehyde, and chemically intermediate between methyl alcohol and formic acid.
Example Sentences:
(1) At the light-microscopic level, adrenergic fibres were identified due to their formaldehyde-induced fluorescence.
(2) Alcohol oxidase and catalase, which catalyse the oxidation of methanol to formaldehyde in Candida boidinii, could be localized within the peroxisomes.
(3) These results suggest that formaldehyde has tumor-promoting activity in carcinogenesis in the glandular stomach.
(4) Colitis was induced in the distal colon by rectal infusion of formaldehyde solution, followed by an intravenous bolus of soluble immune complexes.
(5) The variables tested were: formaldehyde concentration, pH, time, and temperature.
(6) In the scope of our research about the antimicrobial activity of aldehyde-amin-condensates a number of partly new unsymmetrically substituted animals was synthesized by reaction of formaldehyde with different secondary amines.
(7) The fluorescence anisotropy changes observed in A-1 (H1N1) influenza and Sendai parainfluenza viruses in aqueous suspensions when formaldehyde (0.1 to 1.0 p.c.)
(8) Similar results were obtained when hybrid-selected RNA, which had been labeled for 3 h with [3H]uridine, was analyzed on formaldehyde-agarose gels, suggesting that the observed differences were due to splicing rather than RNA stability.
(9) The relative toxicities of formaldehyde and glutaraldehyde to the rat nasal epithelium were determined following intra-nasal instillation of aqueous solutions of these compounds into one nostril of male Fischer 344 (F-344) rats.
(10) When tissue metabolism was irreversibly inhibited by exposure to formaldehyde, hydrogen ion concentration and pCO2 were significantly decreased in the mucosal side of the chamber compared with the viable gall bladder.
(11) Whereas the diagnosis unequivocally could be established by semithin sections the diagnosis was doubtful using material fixed with Bouin's solution and overlooked when the material was fixed with 4% formaldehyde solution.
(12) Key intermediate of the synthesis was 2-formyl-estradiol (2) which was prepared in quantitative yield through reaction of the phenoxymagnesium bromide of estradiol with formaldehyde in the presence of HMPA.
(13) In 139 persons occupationally exposed to compounds of chromium, formaldehyde and p-phenylenediamine lymphocytic transformation test (ltt) was performed to detect a delayed-type hypersensitivity.
(14) Microwave fixation in dilute aldehyde solution has been reported to be superior to fixation in formaldehyde for the preservation of antigens.
(15) Isolated nuclei from green leaf tissue of tomato plants infected with potato spindle tuber viroid (PSTVd) were bound to microscope slides, fixed with formaldehyde and hybridized with biotinylated transcripts of cloned PSTVd cDNA.
(16) Adverse reactions to phenol-formaldehyde resins include depigmentation, irritant dermatitis, chemical burns and allergic contact dermatitis.
(17) The merits of formaldehyde, formaldehyde-glutaraldehyde combinations, and glutaraldehyde in phosphate buffers have been compared as fixatives that will give easy and satisfactory preservation of tissues for routine automated histologic processing and yet keep them suitable for electron microscopical studies after prolonged storage at room temperature.
(18) The optimum hybridization procedure was found to be incubation of serum samples with salt, NaOH, formaldehyde and detergent, followed by spot application of the samples.
(19) A mixture of 4% formaldehyde and 0.5% glutaraldehyde gave the best combination of ultrastructural preservation and retention of enzyme activity.
(20) In second group after thoracotomy the lungs were stabilized with gelatin-resorcin-formaldehyde glue.
Hexamine
Definition:
Example Sentences:
(1) Actinomycin inhibits Mbo I activity in the presence of cobalt hexamine but not in the absence.
(2) At temperatures of 200-300 degrees C hexamine decomposition is reported to produce mainly ammonia and formaldehyde.
(3) Knee joint menisci from osteoarthritic and rheumatoid knees were analyzed for nitrogen, collagen, non-collagenous proteins (NCP) and hexamine content.
(4) BZ-IV is equally digestible in the presence and absence of cobalt hexamine by Hha I, further indicating that the structure of BZ-IV is fully B-like under these conditions.
(5) The available literature on hexamethylenetetramine (hexamine) was reviewed with emphasis on its toxicology and epidemiology, its thermal decomposition and regulatory concerns related to its uses.
(6) Hexamine was also found in biological samples taken from victims of the Damascus attacks, and soil samples taken from the scene.
(7) In order to preserve and enhance the visibility of negatively charged tissue components, particularly the glycosaminoglycan-containing proteoglycans, the cationic stains ruthenium red (RR) and ruthenium hexamine trichloride (RHT) were used.
(8) At neutral pH in the presence of Co hexamine, both strands of the insert have modification maxima situated at one-third of the distance from both ends.
(9) Globule leucocytes in two goats were positive for argentaffin reaction with Gomori hexamine silver stain.
(10) Hexamine cobalt chloride (HCC) increases the efficiency of blunt end ligation by T4 DNA ligase about 50 fold.
(11) The kinetics of electron transfer between cytochrome-c oxidase and ruthenium hexamine has been characterized using the native enzyme or its cyanide complex either solubilized by detergent (soluble cytochrome oxidase) or reconstituted into artificial phospholipid vesicles (cytochrome oxidase-containing vesicles).
(12) Morphological examination of incubated tissue after fixation in the presence of ruthenium hexamine trichloride (RHT) (included to preserve PG in situ) revealed, however, that the PG staining profiles across cartilage matrix varied with the composition of the incubation medium used.
(13) Fixation with ruthenium hexamine trichloride (RHT) and embedding in LR White served to preserve chondrocytes in the expanded state and matrix proteoglycans were observed as a reticular network of filaments.
(14) The effect of the simultaneous administration of hexamine mandelate and methionine on the urinary excretion of calcium, magnesium and phosphate is reported in 3 groups of paraplegic patients.
(15) Although hexamine produces a positive Ames test, most animal studies have shown hexamine to be of very low genetic risk even in very high doses.
(16) A new method for morphological diagnosis of various forms of amyloidosis based on the use of a hot buffered hexamine-silver solution is suggested.
(17) The results of gel mobility studies in the absence and presence of cobalt hexamine indicate that a B-Z junction corresponds to a stiff bend of the helix axis, with two or more conformers accessible at the junction site.
(18) The studies reviewed are in general agreement that hexamine thermal decomposition in the temperature range of 300-800 degrees C is characterized by an increase in HCN and a decrease in NH3 emissions with increasing temperature.
(19) With pentaethylene hexamine, when used alone, it is possible to create a linear pH 4-10 interval, provided the molarity ratios are altered in the two chambers of the gradient mixer.
(20) The effectiveness of hexamine as an antibacterial agent has been attributed to its slow hydrolysis to ammonia and formaldehyde.