Your browser doesn't support javascript.
Mostrar: 20 | 50 | 100
Resultados 1 - 20 de 6.208
Filtrar
1.
Environ Sci Technol ; 54(6): 3114-3120, 2020 03 17.
Artigo em Inglês | MEDLINE | ID: mdl-32022545

RESUMO

Northern China is regularly subjected to intense wintertime "haze events", with high levels of fine particles that threaten millions of inhabitants. While sulfate is a known major component of these fine haze particles, its formation mechanism remains unclear especially under highly polluted conditions, with state-of-the-art air quality models unable to reproduce or predict field observations. These haze conditions are generally characterized by simultaneous high emissions of SO2 and photosensitizing materials. In this study, we find that the excited triplet states of photosensitizers could induce a direct photosensitized oxidation of hydrated SO2 and bisulfite into sulfate S(VI) through energy transfer, electron transfer, or hydrogen atom abstraction. This photosensitized pathway appears to be a new and ubiquitous chemical route for atmospheric sulfate production. Compared to other aqueous-phase sulfate formation pathways with ozone, hydrogen peroxide, nitrogen dioxide, or transition-metal ions, the results also show that this photosensitized oxidation of S(IV) could make an important contribution to aerosol sulfate formation in Asian countries, particularly in China.


Assuntos
Poluentes Atmosféricos , Transtornos de Fotossensibilidade , Aerossóis , Ásia , China , Humanos , Material Particulado , Sulfatos
3.
Dermatol Surg ; 45(11): 1401-1405, 2019 11.
Artigo em Inglês | MEDLINE | ID: mdl-31658188

RESUMO

BACKGROUND: Current treatment options for rosacea include topical agents, oral therapies, phototherapy using lasers, or intense pulsed light (IPL). Combination therapy for rosacea often yields better results than monotherapy. The safety of laser/light treatments in combination with systemic doxycycline has been questioned because of the theoretical risk of photosensitivity. OBJECTIVE: The purpose of this study was to assess the incidence of phototoxicity or photosensitivity in rosacea patients receiving concomitant laser or light treatments and systemic doxycycline. METHODS: Treatment records of 36 patients receiving laser/light treatments while also being treated with standard dose or anti-inflammatory dose of doxycycline were retrospectively reviewed. RESULTS: No adverse reactions related to doxycycline combined with laser/light therapy were reported. Specifically, no photosensitivity or sensitivity to wavelengths in the pulsed dye laser (PDL), or IPL range was observed in this cohort. All patients achieved some degree of clearance. CONCLUSION: The results of this retrospective study demonstrate that doxycycline used in conjunction with laser or nonlaser light therapy is a valid combination therapy for improving signs and symptoms of rosacea. No photosensitivity reactions were observed to commonly used IPL or PDL devices.


Assuntos
Antibacterianos/efeitos adversos , Doxiciclina/efeitos adversos , Terapia de Luz Pulsada Intensa/efeitos adversos , Terapia com Luz de Baixa Intensidade/efeitos adversos , Rosácea/terapia , Administração Cutânea , Adolescente , Adulto , Idoso , Antibacterianos/administração & dosagem , Terapia Combinada/efeitos adversos , Terapia Combinada/métodos , Preparações de Ação Retardada/administração & dosagem , Preparações de Ação Retardada/efeitos adversos , Doxiciclina/administração & dosagem , Feminino , Humanos , Terapia de Luz Pulsada Intensa/instrumentação , Terapia de Luz Pulsada Intensa/métodos , Lasers de Corante/efeitos adversos , Terapia com Luz de Baixa Intensidade/métodos , Masculino , Pessoa de Meia-Idade , Transtornos de Fotossensibilidade/diagnóstico , Transtornos de Fotossensibilidade/etiologia , Estudos Retrospectivos , Pele/efeitos dos fármacos , Pele/efeitos da radiação , Resultado do Tratamento , Adulto Jovem
4.
Prensa méd. argent ; 105(9 especial): 576-581, oct 2019.
Artigo em Inglês | LILACS, BINACIS | ID: biblio-1046621

RESUMO

This work is aimed at studying the problems of timely diagnostics and therapy of various forms of rosacea, identifying the factors that influence the compliance, prognosis, and quality of life of the patients, as well as the stages of combination therapy. The efficiency of rosacea therapy is determined by the timely identification of patients, as well as the clinical variety of the disease. Complex therapy of rosacea includes identification of the precipitating factors, basic skincare, and the use of systemic and local pathogenetic preparations. The "Gold Standard" of topical rosacea therapy is the antimicrobial and antiprotozoal drug called metronidazole. An important role in disease therapy is played by active cooperation between the doctor and the patient. Comprehensiveness, timeliness, and rationality of rosacea therapy are defined not only by the mechanisms of the disease development but also by aggravating factors, the need for basic care and photosensitivity of the patients


Assuntos
Transtornos de Fotossensibilidade , Retinoides/uso terapêutico , Isotretinoína/uso terapêutico , Cooperação do Paciente , Tacrolimo/uso terapêutico , Rosácea/diagnóstico , Terapia Combinada , Metronidazol/uso terapêutico
6.
An Bras Dermatol ; 94(3): 331-333, 2019 Jul 29.
Artigo em Inglês | MEDLINE | ID: mdl-31365663

RESUMO

Solar urticaria is a rare form of physical urticaria mediated by immunoglobulin E. The lesions appear immediately after the sun exposure, interfering with the patient's normal daily life. Omalizumab, a monoclonal anti-IgE antibody, has been recently approved for the treatment of chronic spontaneous urticaria, and the latest reports support its role also in the treatment of solar urticaria. Hereby, we report a case of solar urticaria refractory to conventional treatment strategies, with an excellent response to treatment with omalizumab and phototesting normalization.


Assuntos
Antialérgicos/uso terapêutico , Omalizumab/uso terapêutico , Luz Solar/efeitos adversos , Urticária/tratamento farmacológico , Humanos , Masculino , Pessoa de Meia-Idade , Transtornos de Fotossensibilidade/diagnóstico , Transtornos de Fotossensibilidade/tratamento farmacológico , Transtornos de Fotossensibilidade/etiologia , Urticária/diagnóstico , Urticária/etiologia
7.
Water Res ; 164: 114940, 2019 Nov 01.
Artigo em Inglês | MEDLINE | ID: mdl-31401329

RESUMO

The ubiquitous algogenic extracellular organic matters (EOMs) could enhance solar photodegradation of antibiotics such as Chlortetracycline (CTC), however, the role of chemical constituents and structure in their photosensitizing process was not clear. In this paper, EOMs were extracted from chlorella vulgaris (CV-EOMs), scenedesmus meyen (SM-EOMs) and microcystis aeruginosa (MA-EOMs) to explore their photosensitive efficiencies and mechanisms. All of the EOMs showed higher photosensitive efficiencies than natural organic matter (NOM). The quenching assays and competitive kinetics experiments confirmed the dominant role of 3EOMs* in accelerating CTC photodegradation. The quantum yield coefficients of 3EOMs* (fTMP) of CV-EOMs, SM-EOMs, MA-EOMs, NOM were 139.89 ±â€¯5.46, 125.35 ±â€¯4.69, 91.76 ±â€¯3.53, and 72.84 ±â€¯4.45 L/(mol-photon), respectively. Specific chemical constituents and structure of EOMs were characterized by nuclear magnetic resonance (NMR), fourier transform ion cyclotron resonance mass spectrometry (FT-CIR-MS) and X-ray photoelectron spectroscopy (XPS). The results showed the positive linear correlation of fTMP with content of carbonyl groups in EOMs. In addition, reduction of carbonyl groups in EOMs by NaBH4 significantly decreased CTC photodegradation rate. Density Functional Theory (DFT) calculation suggested the susceptible excitation of carbonyl groups in EOMs under solar light was ascribed to the lowest required energy of electronic transition from HOMO to LUMO (assigned as n-π* transition). The energy of triplet excited-states benzophenone, p-methoxy acetophenone and acetophenone (the EOMs model compounds) was calculated to be 284.92, 288.85 and 265.50 kJ/mol, which were higher than that of CTC (i.e., 217.46 kJ/mol), indicating the energy transfer from excited triplet state to excited triplet state CTC was possible. This study provided mechanism insights into photosensitization effects of allogenic EOMs on photochemical fate of pollutants in aqueous environment.


Assuntos
Chlorella vulgaris , Clortetraciclina , Transtornos de Fotossensibilidade , Humanos , Compostos Orgânicos , Fotólise
8.
Environ Sci Technol ; 53(18): 10732-10740, 2019 Sep 17.
Artigo em Inglês | MEDLINE | ID: mdl-31469271

RESUMO

Extracellular antibiotic resistance genes (eARGs) contribute to antibiotic resistance, and as such, they pose a serious threat to human health. eARGs, regarded as an emerging contaminant, have been widely detected in various bodies of water. Degradation greatly weakens their distribution potential and environmental risks. Dissolved organic matter (DOM), mainly consisted of humic substances, carbohydrates, and organic acids, is ubiquitous in diverse waters and significantly affects the degradation of coexisting contaminants. However, the photodegradation of eARGs in natural water, especially regarding the roles of DOM in this process, remains unknown. Herein, we investigated the eARGs photodegradation in waters with and without DOM. Illumination has been found to effectively photodegrade eARGs, and this process was significantly enhanced by DOM. Further experiments revealed that photosensitization of DOM produced hydroxyl radicals (•OH) to enhance plasmid strand breaks and produced singlet oxygen (1O2) to accelerate the guanine oxidation, which in turn promoted the photodegradation of plasmid-carried eARGs. Transformation assays indicated that eARGs transformation efficiencies were reduced after their photodegradation. The presence of DOM accelerated the decreases of eARGs transformation efficiencies under illumination. DOM concentration and some ions (e.g., NO3-, NO2-, HCO3-, Br-, and Fe3+) affected •OH or 1O2 levels, further influencing the photodegradation of eARGs. Overall, eARGs photodegradation in aquatic environments is a crucial process both in the reduction of eARGs concentrations and in transformation efficiencies. This work facilitated us to better understand the fate of eARGs in waters.


Assuntos
Transtornos de Fotossensibilidade , Poluentes Químicos da Água , Antibacterianos , Resistência Microbiana a Medicamentos , Humanos , Substâncias Húmicas , Fotólise
9.
J Dermatol Sci ; 95(3): 113-118, 2019 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-31421932

RESUMO

BACKGROUND: UV-sensitive syndrome (UVSS) is a rare autosomal recessive genodermatosis characterised by photosensitivity, and hyperpigmentation, freckling, and dryness of sun exposed areas. In contrast to other photosensitivity disorders, affected patients show no predisposition to cutaneous melanoma or neurological dysfunction. UVSS results from a defect in the transcription-coupled nucleotide excision repair (TC-NER) mechanism. UVSS can be caused by mutations in the genes ERCC8, ERCC6, and UVSSA. OBJECTIVE: To determine the underlying genetic cause of UVSS and its functional consequences in nine members of two large, unrelated consanguineous pedigrees from Pakistan. METHODS: Genomic DNA from one affected member of each family was subjected to whole exome sequencing. The identified mutation was then validated via Sanger sequencing using samples from all available family members. Molecular cloning and mammalian cell cultures were used for the translation and localisation of wild type (WT) and mutant constructs. RESULTS: A novel homozygous nonsense mutation, (c.1040G>A [p.(Trp347*)]), was detected in exon 6 of the UVSSA gene in both families. Sanger sequencing revealed co-segregation of the nonsense mutation with the UVSS phenotype. Immunoblotting revealed the anticipated 81kDa band for the WT construct, and a truncated protein of around 39kDa for the mutant. In mutant samples, immunofluorescence revealed mislocalisation of UVSSA from the nucleus to the cytoplasm. CONCLUSIONS: This is the first report of UVSS in the Pakistani population and the fourth report of a disease-causing mutation in UVSSA. The study broadens the UVSSA mutational spectrum, and contributes to functional understanding of truncated UVSSA proteins.


Assuntos
Proteínas de Transporte/genética , Transtornos de Fotossensibilidade/genética , Adolescente , Criança , Códon sem Sentido , Consanguinidade , Análise Mutacional de DNA , Feminino , Homozigoto , Humanos , Masculino , Paquistão , Linhagem , Sequenciamento Completo do Exoma
10.
Actas dermo-sifiliogr. (Ed. impr.) ; 110(6): 448-459, jul.-ago. 2019. tab, ilus
Artigo em Espanhol | IBECS | ID: ibc-185272

RESUMO

A pesar del avance que ha supuesto en la supervivencia de los pacientes oncológicos, la aparición de nuevos agentes quimioterápicos y nuevas combinaciones, estos han traído consigo numerosos efectos adversos que pueden llegar a comprometer el tratamiento y, por consiguiente, el pronóstico de la enfermedad. Entre otros efectos secundarios los citostáticos pueden causar toxicidad dermatológica. El efecto adverso más conocido de la quimioterapia es la alopecia que, aunque no es grave, altera la apariencia externa de los pacientes con cáncer. Otros efectos adversos que pueden observarse son las reacciones de hipersensibilidad y fotosensibilidad, el síndrome mano-pie, la necrólisis epidérmica, las reacciones de reactivación, las reacciones esclerodermiformes, el fenómeno de Raynaud, la siringometaplasia escamosa ecrina, la hidradenitis neutrofílica ecrina, las alteraciones ungueales, las alteraciones en la pigmentación y las lesiones por extravasación. La aparición de estos efectos adversos produce en muchas ocasiones una reducción de dosis y/o retraso del tratamiento, lo que puede afectar a la supervivencia y a la calidad de vida del paciente. Por ello, es importante prevenir su aparición e instaurar un tratamiento temprano, para lo que se hace imprescindible la colaboración entre oncólogos médicos y dermatólogos. En este artículo se revisa la toxicidad dermatológica asociada con la quimioterapia, así como su diagnóstico y abordaje terapéutico


Although the arrival of new chemotherapy drugs and combinations has brought progress in terms of cancer patient survival, they entail many adverse effects that can compromise treatment, and hence prognosis, of the disease. Cytostatic agents can cause dermatological toxicity, among other side effects. The most familiar adverse effect of chemotherapy is alopecia. Although not serious, this changes the outward appearance of cancer patients. Other adverse effects include hypersensitivity and photosensitivity reactions, hand-foot syndrome, epidermal necrolysis, recall reactions, scleroderma-like reactions, Raynaud's phenomenon, eccrine squamous syringometaplasia, neutrophilic eccrine hidradenitis, nail abnormalities, pigmentation changes and extravasation injuries. Onset of these adverse effects often causes dose reduction and/or delayed treatment, which can affect patient survival and quality of life. It is therefore important to prevent their occurrence and treat them promptly, which requires cooperation between medical oncologists and dermatologists. This article reviews chemotherapy-associated dermatological toxicity, along with its diagnosis and therapeutic management


Assuntos
Humanos , Conferências de Consenso como Assunto , Sociedades Médicas/normas , Efeitos Colaterais e Reações Adversas Relacionados a Medicamentos/complicações , Prognóstico , Dermatopatias/induzido quimicamente , Antineoplásicos/efeitos adversos , Oncologia/normas , Espanha , Alopecia/induzido quimicamente , Hipersensibilidade a Drogas/complicações , Transtornos de Fotossensibilidade/induzido quimicamente , Hiperpigmentação/induzido quimicamente
11.
Dermatology ; 235(5): 400-406, 2019.
Artigo em Inglês | MEDLINE | ID: mdl-31288228

RESUMO

BACKGROUND: The Fitzpatrick skin phototype scale (FSPTS) is a widely used instrument to assess skin type. METHODS: A cross-sectional survey collected responses from 254 subjects from Quito regarding self-reported FSPTS, gender, age, education, and tobacco and alcohol consumption. Univariate and multivariate logistic regression analyses were performed to determine if ethnicity, hair color, and eye color significantly predict FSPTS. In addition, we studied the correlation between FSPTS and the SCINEXA scale with Pearson's correlation coefficient. RESULTS: Ethnicity, eye color, and hair color are significant independent predictors of FSPTS (p < 0.0001). CONCLUSIONS: Patient self-reported race and pigmentary phenotypes are inaccurate predictors of sun sensitivity as defined by Fitzpatrick skin phototype. Our study does not fully represent the population of the country. There are limitations to using patient-reported race and appearance in predicting individual sunburn risk.


Assuntos
Transtornos de Fotossensibilidade/classificação , Transtornos de Fotossensibilidade/epidemiologia , Pigmentação da Pele , Adulto , Idoso , Idoso de 80 Anos ou mais , Grupos de Populações Continentais , Estudos Transversais , Equador/epidemiologia , Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Transtornos de Fotossensibilidade/diagnóstico , Transtornos de Fotossensibilidade/fisiopatologia , Fatores de Risco , Autorrelato , Pigmentação da Pele/fisiologia , Queimadura Solar/diagnóstico , Queimadura Solar/epidemiologia , Queimadura Solar/etnologia , Queimadura Solar/fisiopatologia , Bronzeado/fisiologia
13.
Eur J Paediatr Neurol ; 23(4): 653-656, 2019 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-31178275

RESUMO

INTRODUCTION: Pallister-Killian Syndrome (PKS) (OMIM #601803) is a rare genetic disorder caused by a mosaic tetrasomy of the short arm of chromosome 12. Epilepsy is a frequent concern in PKS patients. METHODS: we report 3 PKS patients, with early-onset myoclonic epilepsy and photosensitivity. In these children, we analysed epileptic history and the EEG phenotype. RESULTS: Epilepsy onset was in the first 2 years of life in all patients and in 2 of them myoclonic seizures were the only seizure type. In all children photosensitivity was observed and myoclonic seizures were mainly related to low-frequency (1-6 Hz) intermittent photic stimulation. Levetiracetam was effective and well tolerated in the 2 treated patients. CONCLUSIONS: early-onset myoclonic epilepsy is a possible clinical manifestation of PKS. Low-frequency photosensitivity is a peculiar bioelectrical marker in these children.


Assuntos
Transtornos Cromossômicos/complicações , Epilepsias Mioclônicas/genética , Transtornos de Fotossensibilidade/genética , Pré-Escolar , Cromossomos Humanos Par 12 , Feminino , Humanos , Masculino
16.
J Coll Physicians Surg Pak ; 29(6): S23-S25, 2019 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-31142411

RESUMO

Congenital erythropoietic porphyria, also called Gunther's disease, is a very rare genetic autosomal recessive diseaseaffecting less than 1 per 1,000,000 children. Pathogenesis involves genetic mutation encoding uroporphyrinogen-III cosynthase which leads to accumulation of porphyrin in many tissues, leading to extreme skin photosensitivity, red cell lysis, splenomegaly and reduced life expectancy. Herein, we report a 12-year mentally challenged girl with multiple blisters and scars on sun exposed sites since birth. She had hepatomegaly, erythrodontia, severe anaemia with haemolytic blood picture and mildly elevated liver enzymes. Skin biopsy showed deposition of amorphous eosinophilic porphyrins in the dermis, thus confirming a diagnosis of congenital erythropoietic porphyria.


Assuntos
Anemia Hemolítica/diagnóstico , Deficiência Intelectual , Transtornos de Fotossensibilidade/diagnóstico , Porfiria Eritropoética/diagnóstico , Porfirias/congênito , Biópsia , Criança , Feminino , Hepatomegalia , Humanos , Transtornos de Fotossensibilidade/metabolismo , Transtornos de Fotossensibilidade/patologia , Porfiria Eritropoética/complicações , Porfiria Eritropoética/metabolismo , Porfirias/metabolismo , Porfirias/patologia
18.
An. bras. dermatol ; 94(3): 331-333, May-June 2019. graf
Artigo em Inglês | LILACS | ID: biblio-1011115

RESUMO

Abstract: Solar urticaria is a rare form of physical urticaria mediated by immunoglobulin E. The lesions appear immediately after the sun exposure, interfering with the patient's normal daily life. Omalizumab, a monoclonal anti-IgE antibody, has been recently approved for the treatment of chronic spontaneous urticaria, and the latest reports support its role also in the treatment of solar urticaria. Hereby, we report a case of solar urticaria refractory to conventional treatment strategies, with an excellent response to treatment with omalizumab and phototesting normalization.


Assuntos
Humanos , Masculino , Pessoa de Meia-Idade , Luz Solar/efeitos adversos , Urticária/tratamento farmacológico , Antialérgicos/uso terapêutico , Omalizumab/uso terapêutico , Transtornos de Fotossensibilidade/diagnóstico , Transtornos de Fotossensibilidade/etiologia , Transtornos de Fotossensibilidade/tratamento farmacológico , Urticária/diagnóstico , Urticária/etiologia
19.
Actas dermo-sifiliogr. (Ed. impr.) ; 110(4): 262-272, mayo 2019. tab, graf
Artigo em Espanhol | IBECS | ID: ibc-180898

RESUMO

relación entre esta vitamina y algunas dermatosis ha supuesto la publicación de múltiples trabajos al respecto. Como dermatólogos, conocer sus principales fuentes, síntesis, niveles plasmáticos y algunos de los factores modificadores son varios de los aspectos a recordar. Asimismo, es preciso resaltar los últimos descubrimientos sobre el papel de la vitamina D en las diferentes enfermedades dermatológicas, como el lupus eritematoso, la ictiosis, la dermatitis atópica, la hidrosadenitis supurativa, el acné, la alopecia areata y androgenética, el melanoma y el cáncer cutáneo no melanoma, así como la relevancia como terapia adyuvante en pacientes en tratamiento crónico con corticoides. Acercamos al lector la información más relevante y reciente de la relación entre la vitamina D y las enfermedades de la piel, así como la importancia de conocer los niveles de esta vitamina


In recent years, the growing interest in the role played by vitamin D in skin disease has given rise to the publication of many studies of the relationship between this vitamin and certain skin conditions. As dermatologists, we need to understand, among other aspects, how vitamin D is synthesized and the main sources in humans, as well as plasma levels and the factors that can modify them. Of particular interest are the latest discoveries about the role of vitamin D in skin diseases such as lupus erythematosus, ichthyosis, atopic dermatitis, hidradenitis suppurativa, acne, alopecia areata, androgenetic alopecia, melanoma, and nonmelanoma skin cancer. Also of interest is the importance of vitamin D as adjuvant therapy in patients on long-term treatment with corticosteroids. In this review, we provide an overview of the most important and most recent information regarding the relationship between vitamin D and skin disease and discuss the importance of assessing individual vitamin D status and correcting deficiencies


Assuntos
Vitamina D/uso terapêutico , Deficiência de Vitamina D/complicações , Vitamina D/biossíntese , Vitamina D/metabolismo , Lúpus Eritematoso Cutâneo/etiologia , Ictiose/tratamento farmacológico , Psoríase/tratamento farmacológico , Dermatite Atópica/tratamento farmacológico , Acne Vulgar/tratamento farmacológico , Hidradenite/tratamento farmacológico , Vitiligo/tratamento farmacológico , Transtornos de Fotossensibilidade , Alopecia em Áreas , Neoplasias Cutâneas
20.
Lupus ; 28(6): 697-702, 2019 May.
Artigo em Inglês | MEDLINE | ID: mdl-31023132

RESUMO

Lupus erythematosus (LE) represents a spectrum of inflammatory autoimmune disease comprising varying clinical entities ranging from primary cutaneous to systemic disease. There is a clear relationship between ultraviolet irradiation (UVR) and the clinical manifestations of LE in both adult and pediatric populations. Although it has been established that UVR exacerbates pre-existing LE, it remains unclear whether UVR induces the development of the disease. This review serves to discuss effective photoprotective measures in LE and describe the pathogenic relationship of UVR and LE.


Assuntos
Lúpus Eritematoso Cutâneo/complicações , Transtornos de Fotossensibilidade/etiologia , Protetores Solares/uso terapêutico , Raios Ultravioleta/efeitos adversos , Adulto , Criança , Humanos , Lúpus Eritematoso Cutâneo/diagnóstico , Transtornos de Fotossensibilidade/terapia , Roupa de Proteção , Pele/patologia , Pele/efeitos da radiação
SELEÇÃO DE REFERÊNCIAS
DETALHE DA PESQUISA