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Abbreviation: OPA
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Long forms: 172

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Long Form No. Long Form Research Area Co-occurring Abbreviation PubMed/MEDLINE Info. (Year, Title)
o-phthalaldehyde
(513 times)
Chemistry Techniques, Analytical
(156 times)
HPLC (65 times)
NAC (22 times)
GABA (18 times)
1978 Fluorometric amino-acid analysis with o-phthaldialdehyde (OPA).
ocular pulse amplitude
(164 times)
Ophthalmology
(124 times)
IOP (115 times)
DCT (63 times)
GAT (34 times)
1992 Diagnosis of cavernous sinus arteriovenous fistula by measurement of ocular pulse amplitude.
optical parametric amplifier
(137 times)
Ophthalmology
(116 times)
DFG (13 times)
MIR (8 times)
OPO (8 times)
1996 Noiseless optical amplification in quasi-phase-matched bulk lithium niobate.
opsonophagocytic activity
(122 times)
Allergy and Immunology
(79 times)
IgG (24 times)
GMTs (23 times)
GMCs (22 times)
1999 Contribution of serotype-specific IgG concentration, IgG subclasses and relative antibody avidity to opsonophagocytic activity against Streptococcus pneumoniae.
occupational physical activity
(111 times)
Occupational Medicine
(31 times)
LTPA (55 times)
CI (13 times)
HR (13 times)
1988 10-year trends in physical activity in the eastern Finnish adult population: relationship to socioeconomic and lifestyle characteristics.
ovine pulmonary adenocarcinoma
(84 times)
Veterinary Medicine
(30 times)
JSRV (63 times)
Env (17 times)
ENA (4 times)
2001 Retrovirus-induced ovine pulmonary adenocarcinoma, an animal model for lung cancer.
opsonophagocytic assay
(62 times)
Allergy and Immunology
(31 times)
ELISA (9 times)
GMTs (7 times)
Ig (4 times)
2000 Comparison of an opsonophagocytic assay and IgG ELISA to assess responses to pneumococcal polysaccharide and pneumococcal conjugate vaccines in children and young adults with sickle cell disease.
occipital place area
(48 times)
Neurology
(19 times)
PPA (39 times)
RSC (31 times)
fMRI (9 times)
2013 The occipital place area is causally and selectively involved in scene perception.
octadecylphosphonic acid
(41 times)
Chemistry
(11 times)
SAMs (5 times)
AFM (4 times)
MPa (4 times)
2005 Robust self-assembled octadecylphosphonic acid monolayers on a mica substrate.
10  one-photon absorption
(39 times)
Chemistry
(26 times)
TPA (35 times)
DFT (7 times)
NIR (3 times)
2004 An insight into a novel class of self-assembled porphyrins: geometric structure, electronic structure, one- and two-photon absorption properties.
11  optical phased array
(39 times)
Ophthalmology
(32 times)
LiDAR (4 times)
SOI (2 times)
BOX (1 time)
2004 Optical phased array configuration for an extremely large telescope.
12  overall percent agreement
(33 times)
Pathology
(7 times)
PPA (12 times)
NPA (10 times)
PD-L1 (7 times)
2012 Physiotherapist agreement when visually rating movement quality during lower extremity functional screening tests.
13  orthogonal projection approach
(19 times)
Chemistry Techniques, Analytical
(15 times)
EFA (5 times)
MCR-ALS (4 times)
ALS (2 times)
1996 Orthogonal projection approach applied to peak purity assessment.
14  opsonophagocytic killing assay
(17 times)
Allergy and Immunology
(9 times)
ELISA (3 times)
GMCs (3 times)
AEs (2 times)
2008 A four-parameter logistic model for estimating titers of functional multiplexed pneumococcal opsonophagocytic killing assay.
15  oropharyngeal aspiration
(15 times)
Pediatrics
(4 times)
VFSS (6 times)
BALF (3 times)
MWCNTs (3 times)
2007 Oropharyngeal aspiration and pneumonia in children.
16  occupational PA
(12 times)
Sports Medicine
(5 times)
PA (9 times)
LTPA (6 times)
CHD (2 times)
2012 Physician communication and physical activity among Latinas.
17  oropharyngeal airway
(11 times)
Emergency Medicine
(3 times)
NPA (3 times)
BCLP (1 time)
BVMs (1 time)
2001 Aspiration of an oropharyngeal airway during nasotracheal intubation.
18  Opalinus Clay
(10 times)
Environmental Health
(6 times)
HM (2 times)
COx (1 time)
DOM (1 time)
2003 Diffusion of HTO, 36Cl- and 125I- in Opalinus Clay samples from Mont Terri. Effect of confining pressure.
19  opsonophagocytic
(8 times)
Allergy and Immunology
(3 times)
AEs (1 time)
AOM (1 time)
CI (1 time)
2007 ELISA IgG concentrations and opsonophagocytic activity following pneumococcal protein D conjugate vaccination and relationship to efficacy against acute otitis media.
20  organized physical activity
(8 times)
Environmental Health
(3 times)
AIT (1 time)
aOR (1 time)
ASD (1 time)
2014 Contribution of organized and nonorganized activity to children's motor skills and fitness.
21  octaphlorethol A
(7 times)
Toxicology
(4 times)
AMPK (2 times)
GLUT4 (2 times)
alpha-MSH (1 time)
2012 Octaphlorethol A, a novel phenolic compound isolated from a brown alga, Ishige foliacea, increases glucose transporter 4-mediated glucose uptake in skeletal muscle cells.
22  oligonucleotide pool assay
(7 times)
Genetics
(3 times)
BC (1 time)
DFS (1 time)
DH (1 time)
2008 Coupling amplified DNA from flow-sorted chromosomes to high-density SNP mapping in barley.
23  osteophyte area
(7 times)
Rheumatology
(6 times)
mJSW (7 times)
ROAD (6 times)
OA (5 times)
2010 Normal and threshold values of radiographic parameters for knee osteoarthritis using a computer-assisted measuring system (KOACAD): the ROAD study.
24  oil palm ash
(6 times)
Environmental Health
(2 times)
BET (1 time)
BSE (1 time)
EFB (1 time)
2007 Oil palm ash as partial replacement of cement for solidification/stabilization of nickel hydroxide sludge.
25  outpatient appointments
(6 times)
General Surgery
(2 times)
NHS (1 time)
OSPC (1 time)
PATS (1 time)
2007 A comparison of the views of patients and medical staff in relation to the process of informed consent.
26  Office of Population Affairs
(5 times)
Perinatology
(3 times)
DC (1 time)
FPAR (1 time)
HHS (1 time)
2014 Providing quality family planning services: Recommendations of CDC and the U.S. Office of Population Affairs.
27  offset pixel aperture
(5 times)
Biosensing Techniques
(3 times)
LOPA (2 times)
ROPA (2 times)
BSI (1 time)
2018 Depth extraction with offset pixels.
28  Ordinal Priority Approach
(5 times)
Environmental Health
(3 times)
AEC (1 time)
AFCs (1 time)
BIM (1 time)
2021 Adopting distributed ledger technology for the sustainable construction industry: evaluating the barriers using Ordinal Priority Approach.
29  Ovine pulmonary adenomatosis
(5 times)
Virology
(3 times)
JSRV (3 times)
BAC (2 times)
exJSRV (2 times)
2004 Detection and characterization of betaretroviral sequences, related to sheep Jaagsiekte virus, in Africans from Nigeria and Cameroon.
30  Opalescence
(4 times)
Dentistry
(4 times)
REM (3 times)
CON (1 time)
DD (1 time)
2001 Effects of 10% carbamide peroxide bleaching materials on enamel microhardness.
31  optical platelet aggregometry
(4 times)
Vascular Diseases
(2 times)
CAD (2 times)
ADP (1 time)
AIS (1 time)
2008 Monitoring aspirin therapy with the Platelet Function Analyzer-100.
32  optimized prolate ablation
(4 times)
Ophthalmology
(4 times)
OPDCAT (2 times)
HOAs (1 time)
MTF (1 time)
2005 Optimized prolate ablations with the NIDEK CXII excimer laser.
33  oxalate-pyroantimonate
(4 times)
Histocytochemistry
(2 times)
PPA (2 times)
LAMMA (1 time)
1984 Localization of calcium in skeletal and cardiac muscle.
34  O-phenanthroline
(3 times)
Neoplasms
(3 times)
DUB (1 time)
FIGO (1 time)
HCC (1 time)
2017 Blockade of deubiquitylating enzyme Rpn11 triggers apoptosis in multiple myeloma cells and overcomes bortezomib resistance.
35  o-phthalic dicarboxaldehyde
(3 times)
Chemistry Techniques, Analytical
(2 times)
3-MPA (1 time)
ACE (1 time)
FAAs (1 time)
2000 Analysis of linear and cyclic oligomers in polyamide-6 without sample preparation by liquid chromatography using the sandwich injection method. II. Methods of detection and quantification and overall long-term performance.
36  occlusal plane angle
(3 times)
Dentistry
(3 times)
GA (2 times)
MPA (2 times)
IPA (1 time)
2017 Cephalometric Improvement of Severe Microretrognathia With an Anterior Open Bite Using Curvilinear Mandibular Distraction Osteogenesis.
37  octylamine-modified poly(acrylic acid)
(3 times)
Biotechnology
(1 time)
NCs (2 times)
Chl (1 time)
NIR (1 time)
2020 Chlorophyll-Based Near-Infrared Fluorescent Nanocomposites: Preparation and Optical Properties.
38  oil-particle aggregates
(3 times)
Environmental Health
(3 times)
ASMB (1 time)
CA (1 time)
CLB (1 time)
2017 Effect of evaporative weathering and oil-sediment interaction on the fate and behavior of diluted bitumen in marine environments. Part 2. The water accommodated and particle-laden hydrocarbon species and toxicity of the aqueous phase.
39  optimal power allocation
(3 times)
Biosensing Techniques
(2 times)
DF (1 time)
DNNs (1 time)
FDR (1 time)
2016 Transmit Power Allocation for Physical Layer Security in Cooperative Multi-Hop Full-Duplex Relay Networks.
40  oxaphosphetane
(3 times)
Chemistry
(3 times)
--- 2013 The modern interpretation of the Wittig reaction mechanism.
41  o-phthalaldehyde reagent
(2 times)
Biochemistry
(1 time)
DSA (1 time)
GARA (1 time)
GEN (1 time)
2008 Evaluation of the stability of gentamicin in different antibiotic carriers using a validated MEKC method.
42  observable practice activity
(2 times)
Education
(1 time)
CCCs (1 time)
GSH (1 time)
UC (1 time)
2019 Variation in Entrustment When Sharing a Single Assessment System Between University- and Community-Based Residency Programs: A Comparison.
43  occluded popliteal artery
(2 times)
Endocrinology
(2 times)
FV (2 times)
ICM (1 time)
IMA (1 time)
2012 Alterations of specific biomarkers of metabolic pathways in vascular tree from patients with Type 2 diabetes.
44  ocular photosensitivity analyzer
(2 times)
Eye Diseases
(1 time)
VPT (2 times)
CI (1 time)
ICC (1 time)
2017 New Methods for Quantification of Visual Photosensitivity Threshold and Symptoms.
45  Office of Portfolio Analysis
(2 times)
Biology
(1 time)
NIH (1 time)
NIH-OCC (1 time)
PMC (1 time)
2019 The NIH Open Citation Collection: A public access, broad coverage resource.
46  Ohio Psychiatric Association
(2 times)
Psychiatry
(2 times)
--- 1977 Collaboration between Ohio psychiatrists and the legislature to update commitment laws.
47  oleic and palmitic acid
(2 times)
Molecular Biology
(1 time)
NAFLD (2 times)
ACLY (1 time)
CMIP (1 time)
2021 Regulation on Citrate Influx and Metabolism through Inhibiting SLC13A5 and ACLY: A Novel Mechanism Mediating the Therapeutic Effects of Curcumin on NAFLD.
48  oligodeoxynucleoside phosphoramidates
(2 times)
Biochemistry
(2 times)
OPT (1 time)
1991 Characterization of antisense DNA derivatives having stereoisomeric linkages.
49  oligopeptide amphiphile
(2 times)
Biotechnology
(1 time)
EDS (1 time)
RDC (1 time)
SEM (1 time)
2014 A novel self-assembled oligopeptide amphiphile for biomimetic mineralization of enamel.
50  Ordinary Procrustes analysis
(2 times)
Radiography, Dental
(1 time)
ANCOVA (1 time)
CBCT (1 time)
CS (1 time)
2016 The effect of smiling on facial asymmetry in adults: a 3D evaluation.
51  organ procurement agency
(2 times)
Health Services
(1 time)
BSA (1 time)
1987 Hospitals to receive help in organ procurement.
52  organophosphate acid
(2 times)
Pharmacology
(2 times)
DFP (1 time)
OP (1 time)
1988 Organofluorophosphate-hydrolyzing activity in an estuarine clam, Rangia cuneata.
53  Organophosphorus acid
(2 times)
Pharmacology
(1 time)
DFP (1 time)
1993 Comparison of organophosphorous acid anhydrolases from different species using monoclonal antibodies.
54  oropharyngeal anesthesia
(2 times)
Pulmonary Medicine
(2 times)
OAH (2 times)
CAH (1 time)
NA (1 time)
1987 Upper airway obstruction during sleep in normal subjects after selective topical oropharyngeal anesthesia.
55  other physical activity
(2 times)
Medicine
(2 times)
cpm (1 time)
HTE (1 time)
IPA (1 time)
2020 Accelerometer-assessed outdoor physical activity is associated with meteorological conditions among older adults: Cross-sectional results from the OUTDOOR ACTIVE study.
56  outer-product analysis
(2 times)
Environmental Health
(1 time)
CARS (1 time)
GRA (1 time)
LAR (1 time)
2021 Data fusion for the measurement of potentially toxic elements in soil using portable spectrometers.
57  overall physical activity
(2 times)
Public Health
(2 times)
LTPA (2 times)
GM (1 time)
MoMo (1 time)
2015 Tracking physical activity in different settings from late childhood to early adulthood in Germany: the MoMo longitudinal study.
58  overall positive agreement
(2 times)
Pathology
(1 time)
AGC (1 time)
CPS (1 time)
IHC (1 time)
2021 Comparison of PD-L1 immunohistochemical assays in advanced gastric adenocarcinomas using endoscopic biopsy and paired resected specimens.
59  4-oxopentanal
(1 time)
Toxicology
(1 time)
PM (1 time)
2004 Pyridoxamine: an extremely potent scavenger of 1,4-dicarbonyls.
60  7-oxa-13-prostynoic acid
(1 time)
Endocrinology
(1 time)
PPP (1 time)
1975 7-oxa-13-prostynoic acid and polyphloretin phosphate as non-specific antagonists of the stimulatory effects of different agents on adenylate cyclase from various tissues.
61  agent--Opalescence/Ultradent
(1 time)
Dentistry
(1 time)
DD (1 time)
DE (1 time)
PLA (1 time)
2001 The effect of 10% carbamide peroxide bleaching material on microhardness of sound and demineralized enamel and dentin in situ.
62  AGS-based-optical parametric amplification
(1 time)
Ophthalmology
(1 time)
--- 2019 3.5-mJ 150-fs Fe:ZnSe hybrid mid-IR femtosecond laser at 4.4  mum for driving extreme nonlinear optics.
63  beta-(1-oxo-2-propynyl)androst-4-en-3-one
(1 time)
Biochemistry
(1 time)
beta-HPA (1 time)
1980 Study of 3 alpha, 20 beta-hydroxysteroid dehydrogenase with an enzyme-generated affinity alkylator: dual enzyme activity at a single active site.
64  di-n-octylphosphinate, and n-octylphosphonate
(1 time)
Chemistry
(1 time)
DMAP (1 time)
PPA (1 time)
TOPO (1 time)
2008 Identification of acidic phosphorus-containing ligands involved in the surface chemistry of CdSe nanoparticles prepared in tri-N-octylphosphine oxide solvents.
65  glutathione-O-pthaldialdehyde
(1 time)
Biology
(1 time)
HPLC (1 time)
LOD (1 time)
LOQ (1 time)
2020 Measurement of Glutathione as a Tool for Oxidative Stress Studies by High Performance Liquid Chromatography.
66  histamine-orthophthalaldehyde
(1 time)
Chemistry Techniques, Analytical
(1 time)
--- 2008 Contributions to the determination of histamine rate by measuring out the histamine-orthophthalaldehyde complex in the absorption and fluorescence.
67  l-ornithine phenylacetate
(1 time)
Gastroenterology
(1 time)
AEs (1 time)
ALF (1 time)
ALI (1 time)
2017 Safety, tolerability, and pharmacokinetics of l-ornithine phenylacetate in patients with acute liver injury/failure and hyperammonemia.
68  o-phenylenediamine
(1 time)
Biochemistry
(1 time)
BN-CDs (1 time)
CDs (1 time)
2019 Boron and nitrogen codoped carbon dots as fluorescence sensor for Fe3+ with improved selectivity.
69  o-phthalaldehyde 3-mercaptopropionic acid
(1 time)
Chemistry, Clinical
(1 time)
FMOC (1 time)
HPLC (1 time)
IEC (1 time)
2005 Analysis of plasma amino acids by HPLC with photodiode array and fluorescence detection.
70  o-Phthalaldehyde-mercaptoethanol
(1 time)
Chemistry Techniques, Analytical
(1 time)
HPLC (1 time)
1983 Electrochemical activity of o-phthalaldehyde-mercaptoethanol derivatives of amino acids. Application to high-performance liquid chromatographic determination of amino acids in plasma and other biological materials.
71  o-phthalaldehyde/t-butylthiol
(1 time)
Brain
(1 time)
GABA (1 time)
1999 Extracellular perfusion of rat brain nuclei using microdialysis: a method for studying differential neurotransmitter release in response to neurotoxins.
72  O. pedunculosum agglutinin
(1 time)
Biochemistry
(1 time)
RACE (1 time)
2011 Purification, characterization, and molecular cloning of a novel antifungal lectin from the roots of Ophioglossum pedunculosum.
73  Obesity Policy Action
(1 time)
Metabolism
(1 time)
--- 2008 Obesity Policy Action framework and analysis grids for a comprehensive policy approach to reducing obesity.
74  Objective Pain Assessment
(1 time)
Medicine, Ayurvedic
(1 time)
ECOG (1 time)
FACES (1 time)
HADS (1 time)
2019 Management of chronic pain with Jalaprakshalana (water-wash) Shodhita (processed) Bhanga (Cannabis sativa L.) in cancer patients with deprived quality of life: An open-label single arm clinical trial.
75  oblique paraspinal approach
(1 time)
Neurosurgical Procedures
(1 time)
TDH (1 time)
2019 A Novel, Minimally Invasive Hybrid Technique to Approach Intracanal Herniated Thoracic Discs.
76  oblique periapical
(1 time)
Natural Science Disciplines
(1 time)
CBCT (1 time)
MAR (1 time)
PPA (1 time)
2022 A diagnostic accuracy study on an innovative auto-edge detection technique for identifying simulated implant fractures on radiographic images.
77  oblique projected periapical
(1 time)
Radiography, Dental
(1 time)
AUC (1 time)
CBCT (1 time)
2020 Detection of peri-implant bone defects using cone-beam computed tomography and digital periapical radiography with parallel and oblique projection.
78  observed in ACE-inhibitory activities and proteolytic
(1 time)
Nutritional Sciences
(1 time)
ACE-inhibitory (1 time)
ST (1 time)
2012 The impact of NaCl substitution with KCl on proteinase activities cell-free extract and cell-free supernatant at different pH levels and salt concentrations: Lactobacillus delbrueckii ssp. bulgaricus and Streptococcus thermophilus.
79  observer preference analysis
(1 time)
Radiology
(1 time)
VGA (1 time)
1997 Digital mammography using storage phosphor plate technique--optimizing image processing parameters for the visibility of lesions and anatomy.
80  occult placenta accreta
(1 time)
Pathology
(1 time)
BPMF (1 time)
ISIT (1 time)
2007 Occult placenta accreta: the missing link in the diagnosis of abnormal placentation.
81  occupation based
(1 time)
Endocrinology
(1 time)
LTPA (1 time)
NHANES (1 time)
TPA (1 time)
2019 Diabetes Prevalence by Leisure-, Transportation-, and Occupation-Based Physical Activity Among Racially/Ethnically Diverse U.S. Adults.
82  occupation-related PA
(1 time)
Psychiatry
(1 time)
CI (1 time)
LTPA (1 time)
NHANES (1 time)
2022 Association of domain-specific physical activity with depressive symptoms: A population-based study.
83  occupational activity
(1 time)
Sports Medicine
(1 time)
CA (1 time)
LTPA (1 time)
2002 Twenty-five-year trends in physical activity of 30- to 59-year-old populations in eastern Finland.
84  occurs in the popliteal artery
(1 time)
Cardiology
(1 time)
OFPA (1 time)
1998 Tibioperoneal bypass for popliteal arterial occlusion.
85  octadecyl phosphate
(1 time)
Biomedical Engineering
(1 time)
SAM (1 time)
2019 Ambient Air Stable Ni-Rich Layered Oxides Enabled by Hydrophobic Self-Assembled Monolayer.
86  octadecylphosphoethanolamine
(1 time)
INS (1 time)
PEOP (1 time)
2020 Polymeric nano-vesicles via intermolecular action to load and orally deliver insulin with enhanced hypoglycemic effect.
87  octylamine-poly(acrylic acid)
(1 time)
Nanotechnology
(1 time)
QDs (1 time)
2011 The cytotoxicity of OPA-modified CdSe/ZnS core/shell quantum dots and its modulation by silibinin in human skin cells.
88  off-pathway aggregation
(1 time)
Chemistry
(1 time)
HEWL (1 time)
2017 Insoluble Off-Pathway Aggregates as Crowding Agents during Amyloid Fibril Formation.
89  Office of Patient Affairs
(1 time)
Pediatrics
(1 time)
--- 2005 Characteristics of families that complain following pediatric emergency visits.
90  Oil Pollution Act
(1 time)
Environmental Health
(1 time)
CERCLA (1 time)
ERA (1 time)
NRDA (1 time)
2002 Quantifying natural resource injuries and ecological service reductions: challenges and opportunities.
91  Olefinic peptide nucleic acid
(1 time)
Biochemistry
(1 time)
--- 2003 Olefinic peptide nucleic acid (OPA).
92  olefinic peptide nucleic acid analogues
(1 time)
Biochemistry
(1 time)
--- 2003 Olefinic peptide nucleic acid (OPA).
93  oleic-palmitic acid
(1 time)
Nutritional Physiological Phenomena
(1 time)
NAFLD (1 time)
NExs (1 time)
2019 Free fatty acid-induced histone acetyltransferase activity accelerates lipid accumulation in HepG2 cells.
94  Oligo Pool All
(1 time)
Medicine
(1 time)
EGFR (1 time)
IGFBP3 (1 time)
SNPs (1 time)
2009 An analysis of growth, differentiation and apoptosis genes with risk of renal cancer.
95  oligo pool assay
(1 time)
Genetics
(1 time)
LD (1 time)
SNPs (1 time)
2010 Population- and genome-specific patterns of linkage disequilibrium and SNP variation in spring and winter wheat (Triticum aestivum L.).
96  oligomeric polyamide-1212
(1 time)
Biochemistry
(1 time)
PUUAs (1 time)
2022 Multiple/Two-Way Shape Memory Poly(urethane-urea-amide) Elastomers.
97  oligomeric proanthocynidins
(1 time)
Medicine
(1 time)
OS (1 time)
PMs (1 time)
2011 Activity of some physiological modulators in reducing the side effects of levothyroxine in patients suffering from primary hypothyroidism.
98  oligonucleotide peak analyzer
(1 time)
Chemistry Techniques, Analytical
(1 time)
OMA (1 time)
2012 OMA and OPA--software-supported mass spectra analysis of native and modified nucleic acids.
99  oncofetal pancreatic antigen
(1 time)
Biochemistry
(1 time)
--- 1981 Partial characterisation of an oncofetal pancreatic antigen. Its role in the differential diagnosis and therapy of patients with pancreatic cancer.
100  Oncomine Precision Assay
(1 time)
CEA (1 time)
CRP (1 time)
LDH (1 time)
2022 Rapid genomic profiling of circulating tumor DNA in non-small cell lung cancer using Oncomine Precision Assay with Genexus™ integrated sequencer.