(n.) A substance of a strongly marked yellow color, extracted from the yelk of eggs, and from the tissue of the corpus luteum.
Example Sentences:
(1) Determination of plasma luteinizing hormone (LH) levels in the peripubertal female rats revealed that plasma LH was increased transiently immediately after NPY administration.
(2) The high concentrations of gonadotropins present in immature female rats by the end of the second week of life were suppressed by treatment with an antagonist against luteinizing hormone-releasing hormone (LHRH-A; Org.
(3) Serum and pituitary gonadotropins, hypothalamic luteinizing hormone-releasing hormone (LHRH), and the profile of FSH forms across the isoelectric focusing gel were determined by radioimmunoassay.
(4) The effects of Lisuride, a dopaminergic agonist, on the levels of plasma prolactin (PRL), testosterone, luteinizing hormone (LH), follicle-stimulating hormone (FSH), and on the variations of libido and coital frequency of patients with chronic renal failure (CRF) have been investigated in a group of 20 male patients (ten normoprolactinemic and ten hyperprolactinemic).
(5) Antitumoral effects of the agonist of luteinizing hormone-releasing hormone (D-Trp-6-LH-RH) and the somatostatin analog RC-160 (D-Phe-Cys-Tyr-D-Trp-Lys-Val-Cys-Trp-NH2) on chemically induced ductal pancreatic adenocarcinomas were studied.
(6) Serum testosterone, luteinizing hormone (LH), testicular histology and ultrastructure were examined in 91 spontaneously diabetic BB, semi-starved, and control Wistar rats.
(7) The effect of 5 beta- and 5 alpha-reduced progestins on luteinizing hormone-releasing hormone (LH-RH) release was examined using either an in vitro superfusion or an in vivo push-pull perfusion (PPP) technique.
(8) Treatment with the analog significantly increased serum luteinizing hormone and follicle-stimulating hormone levels, but suppressed accessory sex organ weights.
(9) Despite decreasing luteinizing hormone (LH) levels and increasing FSH levels, androgen levels increased during stimulation on both protocols.
(10) Thyrotropin-releasing hormone (TRH) and luteinizing hormone-releasing hormone (LH-RH) have been measured by radioimmunoassay in individual human hypothalamic nuclei.
(11) Daily determinations of luteinizing hormone activity in plasma throughout a menstrual cycle in ten young women showed a sharp peak of activity lasting less than 48 hours around midcycle and higher mean values during the follicular phase than during the luteal phase in nine instances.
(12) The plasma content of testosterone, dihydrotestosterone, sex hormone binding globulin, apparent free testosterone concentration, follicle-stimulating hormone, and luteinizing hormone were not significantly different between the groups.
(13) The excretion of luteinizing hormone (LH), dopamine, and 5-oxyindolacetic acid (5-OILC) was measured daily over the course of 18 cycles in 15 women, aged 25-30 years.
(14) No changes were observed in basal serum luteinizing hormone (LH), follicle-stimulating hormone (FSH), growth hormone (GH) and cortisol levels, in LH and FSH levels after luteinizing hormone-releasing hormone (LH-RH) stimulation, or in GH and cortisol levels during insulin-induced hypoglycemia.
(15) Plasma testosterone and 5 alpha-dihydrotestosterone concentrations tended to be reduced at these times (though not significantly), while plasma luteinizing hormone concentrations were generally unaffected.
(16) Whereas granulosa cells in developing follicles were either unstained or lightly stained, the heavily luteinized granulosa cells of the preovulatory stimulated follicle were strongly positive for immunoreactive renin and angiotensin II.
(17) There was a trend towards reduced testosterone and increased luteinizing hormone and follicle stimulating hormone in serum at 5000 and 20,000 ppm.
(18) Specific hormonal, cellular, subcellular, and molecular events regulating alpha 2M mRNA and protein have been analyzed during follicular growth, ovulation, and luteinization using complementary in vivo and in vitro models.
(19) The aims of this study were (1) to investigate culture conditions for optimal IN production by luteinized GC (LGC) from rhesus monkeys and (2) to compare IN and progesterone (P) production by nonluteinized GC (NGC) and LGC in response to putative agonists.
(20) In 8 of 12 women, IQCCM occurred 2 days before luteinizing hormone peak; in 4 reexamined women, the same results were observed about the intervals from IQCCM onset and luteinizing hormone peak.
Xanthophyll
Definition:
(n.) A yellow coloring matter found in yellow autumn leaves, and also produced artificially from chlorophyll; -- formerly called also phylloxanthin.
Example Sentences:
(1) In general, polymeric C18 columns allow for the detection of cis carotenes, while monomeric C18 columns provide for some separation of certain xanthophylls.
(2) The characterization of two novel triterpenoid xanthophylls occurring in Streptococcus faecium UNH 564P is described.
(3) The relationship between dietary levels of xanthophyll, the degree of pigmentation in the hen, and egg production rate was studied in commercial broiler breeders (Anak 2000).
(4) The influences of fundus pigments like oxihemoglobin, melanin, xanthophyll and rhodopsin as well as the intensity and the exponent of the scattered light are optimized.
(5) Most reports have focused on the hydrocarbon carotenoids (lycopene, alpha-carotene, and beta-carotene) with fewer dealing with the more polar xanthophyll pigments.
(6) Theoretically, 577 nm seems to be a particularly useful wavelength for the treatment of a wide variety of retinal lesions because it is not absorbed in xanthophyll and penetrates opacities of the optic media better than argon blue green.
(7) The generalization that yellow flowers contained large amounts of xanthophylls and only traces of carotenes, whereas deep-orange flowers seemed to be characterized by the presence of large amounts of one carotene, was not always the correct one.
(8) In theory, the longer wavelength of the solid-state laser offers the advantages of less scattering in ocular media, higher absorption by oxyhemoglobin, and less absorption by macular xanthophyll than the 514-nm wavelength of the regular green argon laser.
(9) In chick plasma studies, it was observed that endogenious xanthophylls participated in the antioxidant defenses against the attack of aqueous peroxyl radical.
(10) It was also observed that rather small concentrations of added xanthophylls (molar fraction up to 3%) increase the pigmented bilayer thickness by a value of about 2 A as compared with that of the pure DMPC bilayer.
(11) The studies involving uninoculated birds with reciprocal chagnes between high and low xanthophyll diets indicated that plasma carotenoids are a more rapid and sensitive means of measuring changes in pigmentation levels than are visual skin scores carotenoid levels from the skin.
(12) Therefore, the AB96 gene product contains binding sites for chlorophylls a and b and xanthophylls, all of which are necessary for optimal reconstitution in vitro.
(13) A number of xanthophylls were included in this study; it would appear that an epoxide group rather than carbonyl or hydroxyl substituents increase the reactivity of the carotenoid with respect to O2(1 delta g).
(14) Using Raman spectroscopy, we demonstrate that low levels of beta-carotene, lycopene, and xanthophyll give rise to resonance enhanced bands in blood plasma.
(15) Conversely, a marked increase in the xanthophyll : Cr2O3 ratio was observed in the cecal contents of chicks inoculated with E. tenella compared with uninuoculated controls or those inoculated with E. acervulina.
(16) The bright yellows, oranges, and reds are due mostly to xanthophylls; keto and hydroxy carotenes.
(17) For both the monohydroxy-xanthophylls, alpha-cryptoxanthin and beta-cryptoxanthin, and the dihydroxy-xanthophylls, lutein and zeaxanthin, the beta, beta structural isomer (beta-cryptoxanthin or zeaxanthin) is less abundant than the beta, epsilon isomer in plasma than in the diet.
(18) Dark and photooxidative degradation of the cells is accompanied with an increase in the level of epiphase xanthophylls (particularly, ketoxanthophylls) and a decrease in the level of carotenes and glycoside xanthophylls, whereas the total content of carotenoids decreases.
(19) In result of the analyses the presence of the following carotenoids has been established: beta-zeacarotene, canthaxanthin, cryptoxanthin, alpha-cryptoxanthin, isocryptoxanthin, lutein, lutein-5,6-epoxide, zeaxanthin, isozeaxanthin, tunaxanthin, flavoxanthin, astaxanthin ester, 4-hydroxy-alpha-carotene, 4-keto-alpha-carotene and unknown xanthophylls.
(20) The findings also support the view that the xanthophylls lutein and zeaxanthin are formed from the corresponding carotenes and are especially important in the development of a normal chloroplast structure.