What's the difference between collidine and pyridine?

Collidine


Definition:

  • (n.) One of a class of organic bases, C8H11N, usually pungent oily liquids, belonging to the pyridine series, and obtained from bone oil, coal tar, naphtha, and certain alkaloids.

Example Sentences:

  • (1) It was also found that tritium release also occurred, although to a lesser extent, when tissues were fixed in glutaraldehyde or osmium tetroxide using collidine as a buffer, and this release was not significant when collidine was applied to previously fixed tissues.
  • (2) It was found that tritium was released very rapidly to the incubation medium when collidine was applied to fresh tissues.
  • (3) Soluble sodium chondroitin sulphate, from bovine ribs or puppy epiphyseal plate, at a concentration 80mm in terms of glucuronate, decreased the amounts of calcium and phosphate precipitated from a solution 6.9mm in phosphate and 6.9 or 13.8mm in calcium, buffered in the pH range 6.6-8.2 with 20-25mm-collidine and 5-20mn-hydrochloric acid when incubated for 2hr.
  • (4) For AIM, the best fixatives were characterized by PA supersaturation, which resulted in smaller crystals and a high rate of penetration in the presence of paraformaldehyde and either phenol or collidine.
  • (5) Organs were fixed by intravascular perfusion with S-collidine-buffered glutaraldehyde solution.
  • (6) Filaments often aggregated into fibrils in fixatives containing phosphate buffer or calcium, whereas vesicles were prominent with fixatives containing collidine buffer.
  • (7) Peptide fractions are eluted with 0.01m-collidine-acetate buffer, pH4.5, 0.17n-acetic acid and 0.1n-hydrochloric acid respectively.
  • (8) The cells of both fetal and infant adipose tissue were separated from connective tissue and fixed by treatment with osmium tetroxide in buffered collidine using a method modified from Hirsch and Gallian (J. Lipid Res.,9:100(1968) for estimation of cell size and number.
  • (9) It is proposed a collidine buffer-sucrose containing medium, which holds cerium ions at pH = 9.0 in solution.
  • (10) These and other results strongly suggested that the histochemical effect of collidine was due to depletion of monoamines stored in the vesicles core.
  • (11) Senecioylchrysarobin (3), beta-carbethoxypropionylchrysarobin (4) and sorbylchrysarobin (5) were prepared by reaction of (1) with the corresponding carboxylic acid chlorides and collidine as a base in toluene.
  • (12) Condensation reactions were performed with silver trifluoromethane-sulfonate as a promoter in the presence of sym-collidine under base-deficient conditions, and gave excellent yields of the desired beta(trans)-products.
  • (13) Glands that had been fixed in glutaraldehyde or osmium tetroxide buffered with collidine exhibited a peripheral zone containing reactive synaptic vesicles and a deeper, central zone where such reactivity was absent.
  • (14) By osmicating at 45 degrees C in an s-collidine buffer it is possible to preserve the soluble BDHC reaction product for EM analysis.
  • (15) The reduction of the s-collidine concentration from 200 mmol to 50 mmol, increase of cerium ion concentration rom 1 mmol to 5 or 10 mmol, and sucrose concentration from 7.5% to 15% at increased from pH = 9.0 to 9.5 less than or equal to 9.9 in the incubation medium led to a high intensification of the histochemical reaction.
  • (16) This abolition was apparent when tissues were briefly incubated in collidine or when they wer fixed in glutaraldehyde or osmium tetroxide using collidine as a buffer substance.
  • (17) The amino acid fraction is obtained by elution with 0.01m-collidine-acetate buffer, pH8.0.
  • (18) The role of different buffers is also discussed, particularly collidine, which permitted better preservation of sodium.
  • (19) As a result fixation of the spiral ganglion for morphometric studies should be performed using s-collidine buffered OsO4.
  • (20) It has been reported that their osmiophilia is eliminated when collidine buffer is used in the fixation procedure.

Pyridine


Definition:

  • (n.) A nitrogenous base, C5H5N, obtained from the distillation of bone oil or coal tar, and by the decomposition of certain alkaloids, as a colorless liquid with a peculiar pungent odor. It is the nucleus of a large number of organic substances, among which several vegetable alkaloids, as nicotine and certain of the ptomaines, may be mentioned. See Lutidine.

Example Sentences:

  • (1) The 1-0-methylalduronic-acidmethylesters, obtained by the methanolysis of the polysaccharides, are reduced with boronhydrid to the corresponding methyl glycosides; there are split with acid to the aldoses, which are converted in pyridine with hydroxylamine to the aldoximes and than with acetic anhydride to the aldonitrilacetates, which can be separated by gaschromatography without difficulty.
  • (2) Vanadate-dependent oxidation of either pyridine nucleotide was inhibited by the addition of either superoxide dismutase or catalase, indicating that both superoxide and hydrogen peroxide may be intermediates in the process.
  • (3) In both cases, the intensity of cleavage was modulated by the position and the degree of methylation on the pyridinic ring, and results were correlated with cytotoxic activity expressed as the in vitro ID50 values for L1210 leukemia cells.
  • (4) After an appropriate dilution, the released pyridine-2-thione which has a strong absorbance at 343 nm, is quantified by reading its absorbance in a spectrophotometer at 343 nm.
  • (5) Oxidation of mitochondrial pyridine nucleotides by alloxan is not mediated by glutathione peroxidase and glutathione reductase and may occur largely nonenzymatically.
  • (6) The safety and diuretic activity of torasemide (1-isopropyl-3- ([4-(3-methyl-phenylamino)pyridine]-3-sulfonyl)urea) were investigated in a phase I single-blind clinical study.
  • (7) The non-carcinogens chosen were 4-nitro-o-phenylenediamine, p-phenylenediamine dihydrochloride, 3-nitropropionic acid, dichlorvos, 2-(chloromethyl)pyridine, N-(1-naphthyl)ethylenediamine 2HCl, O-anthranilic acid, 4-nitroanthranilic acid, anilazine and triphenyltin hydroxide.
  • (8) The alga may be defective in a regulatory mechanism that controls the reoxidation of reduced pyridine nucleotides formed during photosynthesis.
  • (9) Hydrolysis was inhibited competitively by all pyridine nucleotides when the concentration of Mg [gamma 32P]-ATP was varied between 0.1 mM to 3 mM, but NAD+ was less effective.
  • (10) Following derivatization with 50 microliters of N-methyl-N-trimethylsilyl trifluoroacetamide-pyridine (1:1) for 20 min at 65 degrees C the samples are analyzed by capillary column gas chromatography-mass spectrometry with selected-ion monitoring.
  • (11) For each regimen the capsule dose was administered every 8 hours (q 8 h) for 3 days and the plasma profiles of nicardipine and its pyridine analogue (M5) were determined following the last dose on day 4.
  • (12) Its effects were compared with those of its parent substance CGP 18 137A (2-hydrazino-5-n-butyl-pyridine) which is a general arteriolar dilator.
  • (13) Reaction of (9) with phosphorus oxychloride in pyridine afforded the desired 6-cyano dienone (4) in 70% yield.
  • (14) Serial dilutions of pyridine in water are employed for measuring the olfactory detection thresholds of patients.
  • (15) We have studied the binding of the enzymatically active NAD+ analogue, 3-iodopyridine-adenine dinucleotide, and the inactive analogue, pyridine-adenine dinucleotide to the enzyme horse liver alcohol dehydrogenase using X-ray crystallographic methods.
  • (16) Computer simulation of spectra using angle selected techniques enabled the assignment of parameters describing the hyperfine and quadrupole interactions for axially bound nitrogen of imidazole in MbOH, of axial pyridine and butylamine in the models, and for the porphyrin nitrogens of the heme in native MbOH.
  • (17) Since the initial reaction involves internal nucleophilic attack by the pyridine nitrogen, control of the pyridine pKa is critical.
  • (18) Time-course experiments did not indicate any delay in the peak micronucleus response to benzene caused by either pyridine or xylene.
  • (19) Similar effects were obtained with local application of 2 microliters of 10(-3) M 4-amino-pyridine to the stimulated cortex.
  • (20) Based on the analysis of Quantitative Structure--Activity Relationships (QSAR) three representatives of imidazo[4,5-b]pyridine derivatives of predicted high antibacterial activity against Mycobacterium tuberculosis were synthetized and tested bacteriologically.

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