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https://www.readbyqxmd.com/read/26860556/improved-gas-chromatographic-determination-of-guanidino-compounds-using-isovaleroylacetone-and-ethyl-chloroformate-as-derivatizing-reagents
#1
Rizwan Ali Zounr, Mumammad Yar Khuhawar, Taj Muhammad Jahangir, Malik Alamgir
An improved GC method in terms of sensitivity and decrease in the analysis time has been developed for the analysis of eight guanidino compounds: guanidine (G), methylguanidine (MG), creatinine (CTN), guanidinoacetic acid (GAA), guanidinobutyric acid (GBA), guanidinopropionic acid (GPA), argenine (Arg), and guanidinosuccinic acid (GSA), using isovaleroylacetone (IVA) and ethyl chloroformate (ECF) as derivatizing reagents. The separation was obtained from column HP-5 (30 m × 0.32 mm i.d.) with film thickness of 0...
2016: Analytical Sciences: the International Journal of the Japan Society for Analytical Chemistry
https://www.readbyqxmd.com/read/26108562/the-role-of-nitric-oxide-in-passive-leg-movement-induced-vasodilatation-with-age-insight-from-alterations-in-femoral-perfusion-pressure
#2
H Jonathan Groot, Joel D Trinity, Gwenael Layec, Matthew J Rossman, Stephen J Ives, David E Morgan, Amber Bledsoe, Russell S Richardson
The passive leg movement (PLM) model is a novel approach to assess vascular function. Increasing femoral perfusion pressure (FPP) by moving from the supine to the upright-seated posture augments the vasodilatory response to PLM in the young, with no effect in the old, but whether this augmented vasodilatation is nitric oxide (NO) dependent is unknown. Using an intra-arterial infusion of N(G) -monomethyl-L -arginine (L -NMMA) to inhibit nitric oxide synthase (NOS), the posture-induced increases in the PLM responses in the young were nearly ablated, with no effect of NOS inhibition in the old...
September 1, 2015: Journal of Physiology
https://www.readbyqxmd.com/read/25299622/effect-of-exogenous-nitric-oxide-on-sperm-motility-in-vitro
#3
Jiangtao Wang, Qingliu He, Xingyu Yan, Youmei Cai, Junyi Chen
BACKGROUND: Nitric oxide (NO) has been shown to be important in sperm function, and the concentration of NO appears to determine these effects. Studies have demonstrated both positive and negative effects of NO on sperm function, but have not been able to provide a clear link between NO concentration and the extent of exposure to NO. To study the relationship between nitric oxide and sperm capacitation in vitro, and to provide a theoretical basis for the use of NO-related preparations in improving sperm motility for in vitro fertilization, we investigated the effects of NO concentration and time duration at these concentrations on in vitro sperm capacitation in both normal and abnormal sperm groups...
2014: Biological Research
https://www.readbyqxmd.com/read/23353925/nitric-oxide-synthase-inhibitors-protect-against-rotenone-induced-oxidative-stress-mediated-parkinsonism-in-rats
#4
K S Madathil, S S Karuppagounder, R Haobam, M Varghese, U Rajamma, K P Mohanakumar
Rotenone is known to cause progressive dopaminergic neuronal loss in rodents, but it remains unclear how this mitochondrial complex-I inhibitor mediates neurodegeneration specific to substantia nigra pars compacta (SNpc). One of the proposed mechanisms is increased free radical generation owing to mitochondrial electron transport chain dysfunction following complex-I inhibition. The present study examined the role of nitric oxide (NO) and hydroxyl radicals (OH) in mediating rotenone-induced dopaminergic neurotoxicity...
April 2013: Neurochemistry International
https://www.readbyqxmd.com/read/23275754/high-mitochondrial-dna-sequence-divergence-in-new-guinea-carabdytes-stream-beetles-and-the-taxonomist-s-dilemma-when-other-evidence-is-kind-of-subtle%C3%A2-and%C3%A2-collecting-localities-are-far-far-away
#5
Andre Skale, Rene Tänzler, Lars Hendrich, Michael Balke
Carabdytes upin tindigessp. n. is described from the Arfak Mountains Bird's Head Indonesian Papua. It is morphologically very similar to Carabdytes upin upin Balke et al. 1992 known from eastern Indonesian Papua eastward to the western limits of the Papuan Peninsula of Papua New Guinea. For 726 bp at the 3' end of the mitochondrial cox1 gene the subspecies differ by 8.1-9.2% uncorrected p-distance. However we also document considerable cox1 divergence within Carabdytes upin upin. We find few diagnostic positions in the nuclear genes argenine kinase as well as elongation factor 1 alpha that suggest there are indeed two isolated groups of Carabdytes but evidence in elongation factor 1 alpha is not unambiguous...
2012: ZooKeys
https://www.readbyqxmd.com/read/22254178/fluorescence-guided-optical-coherence-tomography-imaging-for-colon-cancer-screening-a-preliminary-mouse-study
#6
Nicusor Iftimia, Arun K Iyer, Daniel X Hammer, Niyom Lue, Mircea Mujat, Martha Pitman, R Daniel Ferguson, Mansoor Amiji
A new concept for cancer screening has been preliminarily investigated. A cancer targeting agent loaded with a near-infrared (NIR) dye was topically applied on the tissue to highlight cancer-suspect locations and guide optical coherence tomography (OCT) imaging, which was used to further investigate tissue morphology at the micron scale. A pilot study on ApcMin mice has been performed to preliminarily test this new cancer screening approach. As a cancer-targeting agent, poly(epsilon-caprolactone) microparticles (PCLMPs), labeled with a NIR dye and functionalized with an RGD (argenine-glycine-aspartic acid) peptide, were used...
January 1, 2012: Biomedical Optics Express
https://www.readbyqxmd.com/read/22194632/kinetic-modeling-of-storage-effects-on-biomarkers-related-to-b-vitamin-status-and-one-carbon-metabolism
#7
Steinar Hustad, Simone Eussen, Øivind Midttun, Arve Ulvik, Puck M van de Kant, Lars Mørkrid, Randi Gislefoss, Per M Ueland
BACKGROUND: Biomarkers and metabolites related to B vitamin function and one-carbon metabolism have been studied as predictors of chronic diseases in studies based on samples stored in biobanks. For most biomarkers, stability data are lacking or fragmentary. METHODS: Degradation and accumulation kinetics of 32 biomarkers were determined at 23 °C in serum and plasma (EDTA, heparin, and citrate) collected from 16 individuals and stored for up to 8 days. In frozen serum (-25 °C), stability was studied cross-sectionally in 650 archival samples stored for up to 29 years...
February 2012: Clinical Chemistry
https://www.readbyqxmd.com/read/21575742/effect-of-creatine-creatinine-and-creatine-ethyl-ester-on-tlr-expression-in-macrophages
#8
Korey M Leland, Thomas L McDonald, Kristen M Drescher
Despite the widespread availability and use of dietary supplements, minimal work has been performed to assess the potential dangers many of these supplements may have on the host's well-being, in particular the host's ability to respond to infection. One supplement extensively used by both adolescents and adults is creatine. Using Real-time PCR, we examined the impact of short-term exposure of a mouse macrophage cell line (RAW 264.7 cells) to two readily available forms of creatine used in supplements--creatine monohydrate (CR) and creatine ethyl ester (CEE) as well as the end product of creatine metabolism, creatinine (CRN), on expression of toll-like receptor-2 (TLR-2), TLR-3, TLR-4, and TLR-7...
September 2011: International Immunopharmacology
https://www.readbyqxmd.com/read/21081182/proteomic-changes-in-the-gills-of-wild-type-and-transgenic-radiosensitive-medaka-following-exposure-to-direct-irradiation-and-to-x-ray-induced-bystander-signals
#9
Richard W Smith, Jiaxi Wang, Carmel E Mothersill, Thomas G Hinton, Kouichi Aizawa, Colin B Seymour
The directly irradiated and bystander gill proteome was examined in wild-type and radiosensitive transgenic medaka. Direct irradiation increased the expression of annexin max 3, creatine kinase (CK), and lactate dehydrogenase (LDH) in both strains and reduced annexin A4 in wild-type medaka only. In bystander fish, same strain pairings increased CK and LDH in both strains and increased annexin max 3 and annexin A4 in radiosensitive medaka. Mixed strain pairings revealed that, in bystander fish, annexin max 3 was only increased by a bystander signal originating from a radiosensitive source, annexin A4 was increased in radiosensitive bystanders irrespective of the signal source, and CK and LDH were increased if either the bystander signal origin or the recipient bystander fish was radiosensitive...
February 2011: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/20836749/correlations-between-islet-autoantibody-specificity-and-the-slc30a8-genotype-with-hla-dqb1-and-metabolic-control-in-new-onset-type-1-diabetes
#10
Caroline Brorsson, Fariba Vaziri-Sani, Regine Bergholdt, Stefanie Eising, Anita Nilsson, Jannet Svensson, Åke Lernmark, Flemming Pociot
We hypothesised that the correlation between autoantibody specificity for the ZnT8 Arg325Trp isoforms and the type 2 diabetes-associated rs13266634 may affect β-cell function at type 1 diabetes (T1D) onset. To study this, we tested 482 newly diagnosed diabetic probands and 478 healthy siblings from the Danish population-based T1D registry for autoantibodies to ZnT8 (ZnT8A) in addition to GAD65 and IA-2. The prevalence and titres of autoantibodies were correlated with genotypes for rs13266634 and HLA-DQB1, age at diagnosis (AAD) and insulin dose-adjusted HbA1c (IDAA1c), as a proxy for residual β-cell function...
March 2011: Autoimmunity
https://www.readbyqxmd.com/read/17324058/inhibition-of-nitric-oxide-synthase-within-the-medial-preoptic-area-impairs-pup-retrieval-in-lactating-rats
#11
G Service, B Woodside
Central suppression of nitric oxide (NO) production by administering 250 microg of Nitro-superw--subL-Argenine Methyl Ether (L-NAME), an inhibitor of NO synthase, into the 3rd ventricle disrupts both pup retrieval and maternal aggression in postpartum rats. In these studies, the authors examined the ability of varying doses of L-NAME to produce these effects on maternal behavior. Doses of L-NAME that were shown to be ineffective when injected into the 3rd ventricle were administered bilaterally into the medial preoptic area (MPOA) of rats on Day 4 postpartum...
February 2007: Behavioral Neuroscience
https://www.readbyqxmd.com/read/16863990/17beta-estradiol-reverses-shear-stress-mediated-low-density-lipoprotein-modifications
#12
Juliana Hwang, Mahsa Rouhanizadeh, Ryan T Hamilton, Tiantian C Lin, Jason P Eiserich, Howard N Hodis, Tzung K Hsiai
Within arterial bifurcations or branching points, oscillatory shear stress (OSS) induces oxidative stress mainly via the reduced nicotinamide adenine dinucleodtide phosphate (NADPH) oxidase system. It is unknown whether 17beta-estradiol (E(2)) can regulate OSS-mediated low-density lipoprotein (LDL) modifications. Bovine aortic endothelial cells were pretreated with E(2) at 5 nmol/L, followed by exposure to OSS (0 +/- 3.0 dynes/cm(2) s and 60 cycles/min) in a flow system. E(2) decreased OSS-mediated NADPH oxidase mRNA expression, and E(2)-mediated (...
August 15, 2006: Free Radical Biology & Medicine
https://www.readbyqxmd.com/read/16598443/comparison-of-carvedilol-and-metoprolol-in-patients-with-acute-myocardial-infarction-undergoing-primary-coronary-intervention-the-passat-study
#13
RANDOMIZED CONTROLLED TRIAL
R Tölg, M Witt, B Schwarz, T Kurz, V Kurowski, F Hartmann, V Geist, G Richardt
BACKGROUND: The value of early therapy with beta-blocking agents in acute myocardial infarction (AMI) undergoing reperfusion is not yet well established. Newer beta-blocking agents such as carvedilol offer potential advantages in the setting of ischemia and reperfusion injury. METHODS: We randomized 100 patients with acute ST-elevation myocardial infarction (STEMI) to receive either 12.5 mg carvedilol or 50 mg metoprolol tartrate orally already before percutaneous coronary intervention (PCI) of the infarct-related artery, uptitrating to a daily target dose of 50 mg carvedilol or 150 mg metoprolol during the first week...
January 2006: Clinical Research in Cardiology: Official Journal of the German Cardiac Society
https://www.readbyqxmd.com/read/16516190/the-beneficial-in-vitro-effects-of-lovastatin-and-chelerythrine-on-relaxatory-response-to-acetylcholine-in-the-perfused-mesentric-bed-isolated-from-diabetic-rats
#14
Zahra Fatehi-Hassanabad, Mohsen Imen-Shahidi, Mohammad Fatehi, Khadijeh Farrokhfall, Heidar Parsaeei
Diabetes mellitus is associated with an increased risk of cardiovascular disease. Endothelial dysfunction (i.e. decreased endothelium-dependent vasorelaxation) plays a key role in the pathogenesis of diabetic vascular disease. The present study was undertaken to determine whether diabetes induced by streptozotocin alters mesenteric responses to vasodilators and, if so, to study the acute in vitro effects of lovastatin and chelerythrine. Endothelial function was assessed in constantly perfused preparation removed from rats, 12 weeks after treatment with either saline or streptozotocin (45 mg/kg, intraperitoneally)...
March 27, 2006: European Journal of Pharmacology
https://www.readbyqxmd.com/read/16443762/integrin-signaling-via-rgd-peptides-and-anti-beta1-antibodies-confers-resistance-to-apoptosis-in-islets-of-langerhans
#15
Gabrielle G M Pinkse, Wendy P Bouwman, Reshma Jiawan-Lalai, O T Terpstra, Jan A Bruijn, Emile de Heer
Islet transplantation is associated with a high rate of early graft failure caused by early immune attack and poor functionality of islets. Apoptosis of islet cells appears soon after islet isolation and primarily involves the beta-cell. The purpose of this study was to determine the effect of ligation to extracellular matrix (ECM) proteins on survival of the islets of Langerhans following islet isolation. Islets that had been cultured for 24 h on collagen type I showed an islet survival of 59.7 +/- 8.7%, while islets that had been cultured on collagen type IV and laminin showed an islet survival of 88...
February 2006: Diabetes
https://www.readbyqxmd.com/read/16441489/hla-drb1-0826-and-hla-dqb1-0627-two-novel-class-ii-alleles-identified-in-blood-stem-cell-donors-of-caucasian-origin
#16
V Brixner, M Mosebach, M Schmidt, S Hermann, E Seifried, H Martin, C Seidl
This report describes two novel HLA class II alleles, HLA-DRB1*0826 and HLA-DQB1*0627, that have been identified in two unrelated voluntary blood stem cell donors of Caucasian origin. HLA-DRB1*0826 is characterized by a nucleotide substitution (G to T) in exon 2 at position 163, leading to an amino acid exchange from argenine to leucine. The donor phenotype is HLA-A*0301,*2902; B*3501,*4403; Cw*0401,*1601; DRB1*0101,*0826; DQB1*0402, *0501. The HLA-DQB1*0627 alleles contain a nucleotide substitution at position 184 (T to C) resulting in an amino acid exchange from tyrosine to histidine...
February 2006: Tissue Antigens
https://www.readbyqxmd.com/read/15159782/a-new-on-chip-esi-nozzle-for-coupling-of-ms-with-microfluidic-devices
#17
M Schilling, W Nigge, A Rudzinski, A Neyer, R Hergenroder
This paper presents a new on-chip electrospray ionisation (ESI) nozzle, which can be used as an interface for coupling microfluidic devices with mass spectrometric (MS) detection. The nozzle was micromilled in a polymer foil (polymethylmethacrylate (PMMA) 750 microm thick), normally used as a cover for microfluidic chips. The performance of this device was examined in the ESI-MS analysis of the tetrapeptide MRFA (methionine-argenine-phenylalanine-alanine). The spray quality is basically dependent on the inner diameter of the nozzle, beside the part of the organic modifier in the solution to be sprayed...
June 2004: Lab on a Chip
https://www.readbyqxmd.com/read/14803126/-histamine-antagonism-of-histidine-and-argenine-in-histaminemia-due-to-sympatol-injection
#18
H BAUR, H STAUB
No abstract text is available yet for this article.
1950: International Archives of Allergy and Applied Immunology
https://www.readbyqxmd.com/read/12815280/sequence-based-discovery-of-a-synthetic-peptide-inhibitor-of-caspase-6
#19
O Nyormoi, Z Wang, M Bar-Eli
We recently demonstrated that tumor necrosis factor alpha activates caspase 6, which in turn cleaves transcription factor AP-2 alpha. We mapped the cleavage site at 19 amino acids from the N-terminus at the sequence aspartate-argenine-histidine-aspartate (DRHD). Mutating aspartic acid at position 19 abrogated the cleavage site. From these observations, we hypothesized that the DRHD peptide could act as a caspase 6 inhibitor. To test this hypothesis, the peptide zAsp(Ome)-Arg-His-Asp(Ome)-fluoromethyl ketone (zDRHDfmk) was synthesized...
August 2003: Apoptosis: An International Journal on Programmed Cell Death
https://www.readbyqxmd.com/read/12215773/purification-and-characterization-of-the-trypsin-inhibitor-from-sophora-alopecuroide-l
#20
Jian Xu, Qiang Zhang, Shu-Ping Luo, Wei-Dong Wu, Qiang Wang, Ning-Li Yu, Mei-Hui Yu
Sophora alopecuroide trypsin inhibitor (SATI) was purified from the seeds of Sophora alopecuroide L. by affinity chromatography on trypsin-sepharose 4B. The inhibitor is homogenous on SDS-PAGE (12%), which is a single polypeptide chain with alanine as its N-terminal. It has the molecular weight of 18 kD and pI at 9.3. Results also show that the inhibitor has a 1:2 molar inhibitory ratio of inhibitor to trypsin. In further study with the method of modification, the residues of argenine and lysine are found to be the only 2 reactive centers on the inhibitor...
1997: Sheng Wu Hua Xue Yu Sheng Wu Wu Li Xue Bao Acta Biochimica et Biophysica Sinica
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