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Natarajan R, Duchon J, Jassar R. Impact of simulation on multidisciplinary NICU teamwork during delivery and transport of extremely preterm infants. J Neonatal Perinatal Med 2023; 16:39-47. [PMID: 36872794 DOI: 10.3233/npm-221118] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/06/2023]
Abstract
BACKGROUND AND OBJECTIVES Multidisciplinary teamwork during delivery room (DR) resuscitation and timely transport to the neonatal intensive care unit (NICU) can reduce morbidity and mortality for infants born Extremely Preterm (EP). We aimed to assess the impact of a multidisciplinary high-fidelity simulation curriculum on teamwork during resuscitation and transport of EP infants. METHODS In a prospective study conducted at a Level III academic center, seven teams (each consisting of one NICU fellow, two NICU nurses, and one respiratory therapist) performed three high-fidelity simulation scenarios. Videotaped scenarios were graded by three independent raters using the Clinical Teamwork Scale (CTS). Times of completion of key resuscitation and transport tasks were recorded. Pre- and post- intervention surveys were obtained. RESULTS Overall, time of completion of key resuscitation and transport tasks decreased, with significant decreases in the time to attach the pulse oximeter, transfer of the infant to the transport isolette, and exit the DR. There was no significant difference in CTS scores from Scenario 1 to 3. Scenarios led by first-year fellows showed a trend towards improvement in all CTS categories. A comparison of teamwork scores pre- and post-simulation curriculum during direct observation of high-risk deliveries in real time revealed a significant increase in each CTS category. CONCLUSION A high-fidelity teamwork-based simulation curriculum decreased time to complete key clinical tasks in the resuscitation and transport of EP infants, with a trend towards increased teamwork in scenarios led by junior fellows. There was improvement of teamwork scores during high-risk deliveries on pre-post curriculum assessment.
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Affiliation(s)
- R Natarajan
- Division of Neonatology, Joseph M. Sanzari Children's Hospital, Hackensack University Medical Center, Hackensack, NJ, USA.,Hackensack Meridian School of Medicine, Nutley, NJ, USA
| | - J Duchon
- Department of Pediatrics, Mount Sinai West, New York, NY, USA
| | - R Jassar
- Division of Newborn Medicine, Massachusetts General Hospital for Children, Massachusetts General Hospital, Boston, MA
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Pavel S, Muskiet FA, Budesínská A, Duchon J. A Qualitative Gas Chromatographic Analysis of Substituted 5,6-Dihydroxyindoles from the Urine of Patients with Melanoma. Tumori 2018; 67:325-32. [PMID: 6797117 DOI: 10.1177/030089168106700409] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
A qualitative gas chromatographic analysis of trimethylsilylated ethyl acetate extracts of melanotic urine revealed 5 indolic compounds, which have been identified as substituted 5,6-dihydroxyindoles. Ethyl acetate extracts of melanotic urines at pH 2.0 contained isomeric 5-hydroxy-6-methoxy and 6-hydroxy-5-methoxy-indolyl-2-carboxylic acids which were not separable under the conditions used. A careful hydrolysis of melanotic urine with a Helix pomatia preparation followed by extraction at pH 6.5 in a nitrogen atmosphere released 3 additional indolic compounds from their conjugated form. Using gas chromatographic-mass spectrometric analysis they were identified as 5-hydroxy-6-methoxy, 6-hydroxy-5-methoxyindole and 5,6-dihydroxyindole.
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Hum RS, Cato K, Sheehan B, Patel S, Duchon J, DeLaMora P, Ferng YH, Graham P, Vawdrey DK, Perlman J, Larson E, Saiman L. Developing clinical decision support within a commercial electronic health record system to improve antimicrobial prescribing in the neonatal ICU. Appl Clin Inform 2014; 5:368-87. [PMID: 25024755 DOI: 10.4338/aci-2013-09-ra-0069] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2013] [Accepted: 02/19/2014] [Indexed: 11/23/2022] Open
Abstract
OBJECTIVE To develop and implement a clinical decision support (CDS) tool to improve antibiotic prescribing in neonatal intensive care units (NICUs) and to evaluate user acceptance of the CDS tool. METHODS Following sociotechnical analysis of NICU prescribing processes, a CDS tool for empiric and targeted antimicrobial therapy for healthcare-associated infections (HAIs) was developed and incorporated into a commercial electronic health record (EHR) in two NICUs. User logs were reviewed and NICU prescribers were surveyed for their perceptions of the CDS tool. RESULTS The CDS tool aggregated selected laboratory results, including culture results, to make treatment recommendations for common clinical scenarios. From July 2010 to May 2012, 1,303 CDS activations for 452 patients occurred representing 22% of patients prescribed antibiotics during this period. While NICU clinicians viewed two culture results per tool activation, prescribing recommendations were viewed during only 15% of activations. Most (63%) survey respondents were aware of the CDS tool, but fewer (37%) used it during their most recent NICU rotation. Respondents considered the most useful features to be summarized culture results (43%) and antibiotic recommendations (48%). DISCUSSION During the study period, the CDS tool functionality was hindered by EHR upgrades, implementation of a new laboratory information system, and changes to antimicrobial testing methodologies. Loss of functionality may have reduced viewing antibiotic recommendations. In contrast, viewing culture results was frequently performed, likely because this feature was perceived as useful and functionality was preserved. CONCLUSION To improve CDS tool visibility and usefulness, we recommend early user and information technology team involvement which would facilitate use and mitigate implementation challenges.
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Affiliation(s)
- R S Hum
- Department of Pediatrics, Columbia University , NY, NY
| | - K Cato
- School of Nursing, Columbia University , NY, NY
| | - B Sheehan
- Faculty Practice Organization, Columbia University , NY, NY
| | - S Patel
- Department of Pediatrics, Northwestern University , Chicago, IL
| | - J Duchon
- Department of Pediatrics, Columbia University , NY, NY
| | - P DeLaMora
- Department of Pediatrics, Weill Cornell Medical College , NY, NY
| | - Y H Ferng
- School of Nursing, Columbia University , NY, NY
| | - P Graham
- Department of Pediatrics, Columbia University , NY, NY ; Department of Quality and Patient Safety, NewYork-Presbyterian Hospital , NY, NY ; Department of Infection Prevention & Control, NewYork-Presbyterian Hospital , NY, NY
| | - D K Vawdrey
- Department of Biomedical Informatics, Columbia University , NY, NY
| | - J Perlman
- Department of Pediatrics, Weill Cornell Medical College , NY, NY
| | - E Larson
- School of Nursing, Columbia University , NY, NY ; School of Nursing and Mailman School of Public Health, Columbia University , NY, NY
| | - L Saiman
- Department of Pediatrics, Columbia University , NY, NY ; Department of Infection Prevention & Control, NewYork-Presbyterian Hospital , NY, NY
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Carey AJ, Duchon J, Della-Latta P, Saiman L. The epidemiology of methicillin-susceptible and methicillin-resistant Staphylococcus aureus in a neonatal intensive care unit, 2000-2007. J Perinatol 2010; 30:135-9. [PMID: 19710681 DOI: 10.1038/jp.2009.119] [Citation(s) in RCA: 68] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
OBJECTIVE To assess the epidemiology of methicillin-susceptible Staphylococcus aureus (MSSA) and methicillin-resistant S. aureus (MRSA) infections in a neonatal intensive care unit (NICU). STUDY DESIGN A retrospective chart review was conducted from 2000-2007; demographic and clinical characteristics of infected infants and crude mortality were assessed. RESULTS During the study period, there were 123 infections caused by MSSA and 49 infections caused by MRSA. Although the types of infections caused by MSSA and MRSA were similar, infants with MRSA infections were younger at clinical presentation than infants with MSSA infections (P=0.03). The overall rate of S. aureus infections was approximately 15-30 per 1000 patient-admissions. The rate of bacteremia and skin and soft tissue infections remained stable over time. Among extremely low birth weight infants (birth weight <1000 g), 4.8 and 1.8% developed an infection caused by MSSA or MRSA, respectively. Infections occurred in a bimodal distribution of birth weight; 53% of infections occurred in extremely low birth weight infants and 27% occurred among term infants birth weight >or=2500 g, many of whom underwent surgical procedures. CONCLUSIONS MSSA and MRSA remain significant pathogens in the NICU, particularly for extremely premature infants and term infants undergoing surgery. Further work should investigate infection control strategies that effectively target the highest risk groups and determine if vertical transmission of MRSA is responsible for the younger age at presentation of infection.
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Affiliation(s)
- A J Carey
- Department of Pediatrics, Division of Neonatology, Columbia University, New York, NY 10032, USA.
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Duchon J. Charles University and pigment cell research. Sb Lek 2000; 100:13-25. [PMID: 10860121] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/16/2023]
Abstract
A short review on the pigment cell research at Charles University in Prague is presented.
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Affiliation(s)
- J Duchon
- Second Department of Medical Chemistry and Biochemistry, 1st Faculty of Medicine, Charles University, Prague, Czech Republic
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Duchon J. Tradition of pigment cell research at Charles University in Prague. Cell Mol Biol (Noisy-le-grand) 1999; 45:883-94. [PMID: 10643993] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/15/2023]
Abstract
A short review on the history of pigment cell research at Charles University (Ch.U.) in Prague is presented. The famous Czech physiologist and professor J.E. Purkyne started the pigment cell research at Ch.U. already in 1837. He discovered melanin granules in the cells of substantia nigra of the brain. Later, in 1858, a Czech professor of medicine at Ch.U., B. Eiselt, as the first, described melanogenuria in 3 patients with generalized melanoma. Also some German professors at Ch.U. contributed to the research of melanins and melanogenuria in the past, especially H. Waelsch (1932). After the World War II, a Czech professor of medical chemistry at Ch.U., A.F. Richter with his young assistant J. Duchon continued in the chemical exploration of melanins (1954) and J.D. with Z. Pechan, B. Matous and S. Pavel devoted their attention to melanogenuria in melanoma patients (1962-1980). In 1967 they identified 2 new metabolites in melanoma urine: 5-hydroxy-6-methoxy and 6-hydroxy-5-methoxy-indole-2-carboxylic acids. J. Duchon with J. Borovanský and P. Hach also studied morphology and chemical composition of different melanosomes (1972-1979) and brought the first evidence that melanosomes consist of several proteins (1972). In 1980's 4 groups devoted to the pigment cell research and originated from Ch.U. were formed. The groups of J.B., of B.M. and of J. Vachtenheim in Prague and the group of S.P. who moved to the Netherlands (Leiden). As for the clinical aspects of the pigment cell research, the s.c. Hermanský-Pudlák syndrome published in 1959 and the histopathological classification of malignant melanomas estimated by J. Trapl (1957), should be mentioned. Therefore it is not surprising that, as a result of the tradition of pigment cell research at Ch.U., the 3rd European Workshop on Melanin Pigmentation was held in Prague already in 1981 and that, in 1998 again, Ch.U. was entrusted with the arrangement of the 8th Meeting of the European Society for Pigment Cell Research at the occasion of the Ch.U. 650th anniversary.
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Affiliation(s)
- J Duchon
- 2nd Department of Biochemistry, 1st Faculty of Medicine, Charles University, Prague, Czech Republic
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Duchon J. [100 years since the birth of Professor Antonín Felix Richter]. Sb Lek 1998; 97:545-52. [PMID: 9424719] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Affiliation(s)
- J Duchon
- II. ústav lékarské chemie a biochemie 1. lékarské fakulty Univerzity Karlovy, Praha, Czech Republic
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Rayman J, Krchnavý M, Balciar P, Duchon J, Fortuník J, Faith L, Manduchova H, Drgona L, Koren P, Kraszko I, Krcméry V. Ofloxacin once daily versus twice daily in community-acquired pneumonia and acute exacerbation of chronic bronchitis. A randomized multicenter study. Chemotherapy 1996; 42:227-30. [PMID: 8983892 DOI: 10.1159/000239447] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
Eighty-two patients with community-acquired pneumonia (CAP) or acute exacerbation (AE) of chronic bronchitis were randomized to receive ofloxacin (OFL) 400 mg twice daily (39 patients) versus 400 mg once daily (43 patients) orally. Cure rates showed no statistically significant difference (90.1 vs. 94.6%), but more patients receiving 800 mg/day had side effects. Thus, the once daily administration of OFL is equally effective and safer than 400 mg twice daily to treat CAP or AE chronic obstructive pulmonary disease, especially in countries with higher pneumococcal and Haemophilus influenzae resistance in community practice.
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Affiliation(s)
- J Rayman
- Department of Pneumology, University Hospital Trnava, Slovakia
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Duchon J. Melanogenuria: the past--the present--the future. Sb Lek 1994; 95:297-307. [PMID: 8867701] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
A short review on the development of the study of melanogenuria in malignant melanoma is presented.
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Affiliation(s)
- J Duchon
- 2nd Department of Medical Chemistry and Biochemistry, Charles University, Prague, Czech Republic
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Abstract
Strategy of protein determination in melanin containing samples was analyzed, and the prerequisites under which the Lowry procedure could be used were established. (a) Complete solubilization of proteins from melanosomes was not reached until the treatment with 3% sodium dodecylsulfate at 100 degrees C was prolonged to 5 h. (b) It is necessary to correct the data obtained with Folin reaction to eliminate melanin interference. (c) The correction is based upon the determination of the extent of solubilized melanin and subtraction of the corresponding Folin-Ciocalteu reaction values. (d) The extent of correction due to the melanin interference was found to be about 40% of the absorbance value. It was concluded that correction of the data obtained with Lowry assay is possible, but the procedure is complicated and time-consuming. However, a more simple modification has not been developed.
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Affiliation(s)
- E Vedralová
- Department of Biochemistry, Faculty of Medicine, Charles University, Prague, Czechoslovakia
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Abstract
The melanosomes were isolated from Syrian hamster melanoma Ma by three different methods. Levels of about 0.2% RNA and less than 0.05% of DNA were detected in the melanosome preparations. The higher the purification of the melanosome samples, the lower the DNA content observed. Consequently, traces of DNA in melanosomes could originate from contamination. The irreversible interaction of DNA with melanosomes in vitro was not demonstrated.
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Affiliation(s)
- E Vedralová
- Department of Biochemistry, Faculty of Medicine, Charles University, Prague, Czechoslovakia
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Abstract
1. Tyrosinase was purified from melanosomal fraction of hamster melanoma. 2. A radioimmunoassay was developed to quantitate the tyrosinase protein in hamster serum and hamster melanoma tissue using polyclonal anti-tyrosinase antibodies and 125I-labeled enzyme. 3. The serum tyrosinase levels were found to be about 0.24 micrograms and 1.14-4.48 micrograms/ml in normal hamsters and melanoma-bearing hamsters, respectively. 4. Tyrosinase protein in serum correlated significantly with the enzyme activity in hamsters with melanoma (r = 0.733). 5. In the cytosol fraction of hamster melanoma, a level of 2.2 micrograms of tyrosinase/mg protein was determined. 6. The usefulness and possible applications of the tyrosinase radioimmunoassay are discussed.
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Affiliation(s)
- J Vachtenheim
- Department of Biochemistry, Faculty of General Medicine, Charles University, Prague, Czechoslovakia
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Abstract
Polyclonal antibodies to hamster melanoma tyrosinase were raised in rabbits, and series of immunoinhibition experiments with a purified enzyme and specific immunoglobulins were carried out. Tyrosinase activity was determined by a set of radiochemical and spectrophotometric methods utilizing tyrosine, dopa, dopamine, or dihydroxyindole (DHI) as substrates. The quantitative data obtained indicated that the complexing of tyrosinase with its specific antibody inhibited melanogenesis in a specific manner: dopachrome formation from dopa and dopamine conversion to melanin were not affected and all other enzyme activities comprising the DHI oxidation step were inhibited to various degrees. Additionally, tyrosine hydroxylation was also slightly inhibited. The data obtained implied that melanogenesis was restricted at the point of DHI oxidation. From observations on the immunoinhibition of a DHI oxidation at varying dopa-cofactor concentrations, we propose that dopa-cofactor may be bound at separate site than DHI and thus may act as a positive allosteric effector for DHI oxidation by tyrosinase. Study of tyrosinase immunoinhibition by the antibodies against the enzyme thus seems to provide a valuable system for investigating the tyrosinase-mediated melanogenesis.
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Vachtenheim J, Duchon J, Matous B. A spectrophotometric assay for mammalian tyrosinase utilizing the formation of melanochrome from L-dopa. Anal Biochem 1985; 146:405-10. [PMID: 3927772 DOI: 10.1016/0003-2697(85)90559-7] [Citation(s) in RCA: 37] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
A simple spectrophotometric method for a rapid determination of tyrosinase (EC 1.14.18.1) is described. The basis of the assay is the incubation of the enzyme with L-dopa in the presence of an optimal concentration of Zn2+ ions and the measurement of the formation of melanochrome, as indicated by the rise in absorbance at 540 nm. Final absorbance change reflects probably two activities of tyrosinase: the oxidation of dopa to dopaquinone and the conversion of 5,6-dihydroxyindole to melanochrome. Using a purified preparation from hamster melanoma, the assay was found to be more sensitive than the commonly used dopachrome assay. Comparison with some other currently available methods for assaying tyrosinase is presented and potential applications of the assay are discussed.
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Abstract
Two tyrosinase isozymes were purified from pigmented hamster melanoma and injected i.v. into rats. It was shown that while T1 (sialylated) isozyme survived in the circulation, native asialo (T2) isozyme and neuraminidase-desialylated T1 isozyme disappeared from the circulation in a few minutes. Desialylated fetuin had a marked inhibitory effect on the removal of asialo-T1 tyrosinase. These data indicate that the enzyme tyrosinase shares the common pattern of clearance from circulation known for the majority of serum glycoproteins. The electrophoretic pattern of tyrosinase isozymes partially purified from the sera of melanoma-bearing animals were compared with those from the soluble fraction of the tumors. In hamsters, melanoma tissue revealed both T1 and T2 isozymes while serum exhibited T1 and very weak T2, supporting the mechanism of clearance demonstrated in rats. In mice bearing Cloudman S-91 or B-16 melanomas, only T1 isozyme was seen in sera and in tumors.
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Pavel S, Muskiet FA, Nagel GT, Duchon J. [Identification of some indolic acids in urine using mass fragmentography (author's transl)]. Sb Lek 1981; 83:121-7. [PMID: 7256174] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
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Pavel S, Muskiet FA, Nagel GT, Schwippelová Z, Duchon J. Identification of two Thormählen-positive compounds from melanotic urine by gas chromatography-mass spectrometry. J Chromatogr 1981; 222:329-36. [PMID: 7228942 DOI: 10.1016/s0378-4347(00)84132-8] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
The isolation of two Thormählen-positive compounds from the urine of a patient with malignant melanoma and the elucidation of their structure by gas chromatography-mass spectometry is described. The compounds were isolated using a poly-N-vinylpyrrolidone column and separated by preparative thin-layer chromatography. After elution they were analyzed by gas chromatography and gas chromatography-mass spectrometry as their trimethylsilyl derivatives and after hydrolysis also as their tert.-butyldimethylsilyl derivatives. The results showed the main Thormählen-positive compound A to be the glucuronide of 5-hydroxy-6-methoxyindole, whereas the minor compound AX appeared to be the glucuronide of its isomer 6-hydroxy-5-methoxyindole.
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Pavel S, Vyhnálková V, Matous B, Duchon J, Kubíková M. [Evaluation of the excretion of phenolic and indolic substances in patients with malignant melanoma at the district hospital in Ustí nad Labem]. Cesk Dermatol 1980; 55:244-8. [PMID: 6157494] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
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Horcicko J, Kubíková M, Borovanský J, Duchon J, Duchková H. [Hyperexcretion of zinc in malignant melanoma]. Cesk Dermatol 1980; 55:249-51. [PMID: 7407960] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
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Horáková E, Duchková H, Duchon J, Kulenda Z, Peska J. [Amino acids in malignant melanoma]. Cesk Dermatol 1980; 55:273-4. [PMID: 7407968] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
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Matous B, Budĕsínská A, Mechl Z, Sopková B, Pavel S, Duchon J. [Clinical significance of tests for Thormählen-positive melanogen excretion in malignant melanoma]. Cesk Dermatol 1980; 55:238-41. [PMID: 7407958] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
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Abstract
As zinc is the dominant trace element of melanin pigmentation, its urinary excretion was studied in 63 patients with malignant melanoma and also in groups of carcinoma patients and normal subjects. For comparison, magnesium excretion was also measured. As the melanoma progressed, the zinc excretion increased, but there was no correlation between the magnesium excretion and the stage of melanoma. There were no significant differences in excretion of either metal between the groups of treated melanoma patients, normal individuals, or the carcinoma patients.
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Matous B, Mechl Z, Sopková B, Duchon J, Pavel S, Budĕsinská A, Kocent A. The excretion of Thormählen positive melanogens in melanoma patients and its clinical significance. Eur J Cancer 1980; 16:383-8. [PMID: 7371692 DOI: 10.1016/0014-2964(80)90356-4] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
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Pavel S, Schwippelová Z, Duchon J, Matous B, Vulterin K. Chromatography of melanogens from urine of hamsters with transplantable melanoms. I. Thormählen-positive melanogens. J Chromatogr 1978; 154:117-21. [PMID: 670364] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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Schwippelová Z, Pavel S, Duchon J, Matous B. Chromatography of melanogens from urine of hamsters with transplantable melanoma. II. Thormählen-negative melanogens. J Chromatogr A 1978; 154:122-6. [PMID: 670365 DOI: 10.1016/s0021-9673(00)88493-9] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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Pavel S, Matous B, Duchon J. Simple screening test for estimation of some phenolic and indolic compounds in urine application to melanoma. J Invest Dermatol 1978; 70:197-9. [PMID: 641370 DOI: 10.1111/1523-1747.ep12541320] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
A simple screening test for estimation of some phenolic and indolic compounds in urine is described. The method is rapid, simple and able to detect all the indolic and phenolic compounds observed, including o-dihydroxy compounds. The method is based on the color reaction with reagent solution composed of sodium tungstate, trichloroacetic acid, hydrochloric acid and sodium nitrite. After alkalinization by sodium hydroxide the optical density is measured at 405 and 490 nm. The latter is specific for o-dihydroxy compounds. This test seems to be useful for estimation of phenolic and indolic compounds in urine of patients with increased production of compounds of this nature, particularly in some tumors.
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Schwippelová Z, Pavel S, Duchon J. [2-dimensional chromatography of phenolic acids on a thin layer of cellulose]. Vnitr Lek 1977; 23:481-5. [PMID: 867881] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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Duchon J. [The 70th birthday of Prof. Jan sula, D.Sc]. Cas Lek Cesk 1974; 113:872. [PMID: 4603916] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
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Buchvaldová S, Duchon J, Klobusický M. [Incidence and significance of asymptomatic candiduria and bacteriuria in diabetic women (author's transl)]. Cas Lek Cesk 1974; 113:67-72. [PMID: 4434410] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
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Czigner J, Duchon J, Deutsch O, Bátai I. [4-years of experiences in the endolaryngeal microscopy and microsurgery]. Monatsschr Ohrenheilkd Laryngorhinol 1973; 107:264-70. [PMID: 4717236] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
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35
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Horcicko J, Borovanský J, Duchon J. [Distribution of zinc and copper in different-colored human hair]. Dermatol Monatsschr 1973; 159:206-9. [PMID: 4704940] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
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36
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Horcicko J, Borovanský J, Duchon J, Procházková B. Distribution of zinc and copper in pigmented tissues. Hoppe Seylers Z Physiol Chem 1973; 354:203-4. [PMID: 4803255] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
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37
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Duchon J, Czigner J, Pupp L. [Pachydermia laryngitis and smoking]. Z Laryngol Rhinol Otol 1972; 51:253-7. [PMID: 5037279] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
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38
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Procházková B, Duchon J. [Appearance of homovanillic acid and vannillactic acid in the urine of mice with transplantable Harding-Passey melanoma]. Cas Lek Cesk 1970; 109:147-50. [PMID: 5413522] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
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39
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40
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Duchon J, Czigner J. [On the classification and nomenclature of hyperplasia of laryngeal squamous epithelium]. Z Laryngol Rhinol Otol 1967; 46:610-8. [PMID: 5596120] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
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41
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Duchon J, Matous B. Identification of two new metabolites in melanoma urine: 5-hydroxy-6-methoxyindole-2-carboxylic and 5-methoxy-6-hydroxyindole-2-carboxylic acids. Clin Chim Acta 1967; 16:397-402. [PMID: 6035185 DOI: 10.1016/0009-8981(67)90305-1] [Citation(s) in RCA: 34] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
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42
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Dienstbier E, Balík J, Duchon J, Fischer O. [Excretion of 5-hydroxyindoleacetic acid and vanilmandelic acid in patients with glaucoma]. Cesk Oftalmol 1967; 23:177-86. [PMID: 5586682] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
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43
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Duchon J. [Identification and structure determination of 2 new metabolites from melanotic urine]. Cas Lek Cesk 1966; 105:785-6. [PMID: 5919869] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
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44
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Duchon J, Tarcsy G. Das Ermöglichen des Blasens eines Blasinstrumentes nach vollständiger operativer Entfernung des Larynx. ORL J Otorhinolaryngol Relat Spec 1961. [DOI: 10.1159/000274355] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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45
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Duchon J, Bauer M. Hypakusis nach akuter Alkoholvergiftung. ORL J Otorhinolaryngol Relat Spec 1960. [DOI: 10.1159/000274259] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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