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1.
Microbiol Spectr ; 11(4): e0153223, 2023 08 17.
Artigo em Inglês | MEDLINE | ID: mdl-37289058

RESUMO

Within Eukaryotes, fungi are the typical representatives of haplontic life cycles. Basidiomycota fungi are dikaryotic in extensive parts of their life cycle, but diploid nuclei are known to form only in basidia. Among Basidiomycota, the Pucciniales are notorious for presenting the most complex life cycles, with high host specialization, and for their expanded genomes. Using cytogenomic (flow cytometry and cell sorting on propidium iodide-stained nuclei) and cytogenetic (FISH with rDNA probe) approaches, we report the widespread occurrence of replicating haploid and diploid nuclei (i.e., 1C, 2C and a small proportion of 4C nuclei) in diverse life cycle stages (pycnial, aecial, uredinial, and telial) of all 35 Pucciniales species analyzed, but not in sister taxa. These results suggest that the Pucciniales life cycle is distinct from any cycle known, i.e., neither haplontic, diplontic nor haplodiplontic, corroborating patchy and disregarded previous evidence. However, the biological basis and significance of this phenomenon remain undisclosed. IMPORTANCE Within Eukaryotes, fungi are the typical representatives of haplontic life cycles, contrasting with plants and animals. As such, fungi thus contain haploid nuclei throughout their life cycles, with sexual reproduction generating a single diploid cell upon karyogamy that immediately undergoes meiosis, thus resuming the haploid cycle. In this work, using cytogenetic and cytogenomic tools, we demonstrate that a vast group of fungi presents diploid nuclei throughout their life cycles, along with haploid nuclei, and that both types of nuclei replicate. Moreover, haploid nuclei are absent from urediniospores. The phenomenon appears to be transversal to the organisms in the order Pucciniales (rust fungi) and it does not occur in neighboring taxa, but a biological explanation or function for it remains elusive.


Assuntos
Basidiomycota , Diploide , Animais , Basidiomycota/genética , Fungos , Estágios do Ciclo de Vida , Meiose
2.
Environ Pollut ; 304: 119199, 2022 Jul 01.
Artigo em Inglês | MEDLINE | ID: mdl-35337890

RESUMO

Under the climate change context, warming Southern Ocean waters may allow mercury (Hg) to become more bioavailable to the Antarctic marine food web (i.e., ice-stored Hg release and higher methylation rates by microorganisms), whose biomagnification processes are poorly documented. Biomagnification of Hg in the food web of the Antarctic Peninsula, one of the world's fastest-warming regions, was examined using carbon (δ13C) and nitrogen (δ15N) stable isotope ratios for estimating feeding habitat and trophic levels, respectively. The stable isotope signatures and total Hg (T-Hg) concentrations were measured in Antarctic krill Euphausia superba and several Antarctic predator species, including seabirds (gentoo penguins Pygoscelis papua, chinstrap penguins Pygoscelis antarcticus, brown skuas Stercorarius antarcticus, kelp gulls Larus dominicanus, southern giant petrels Macronectes giganteus) and marine mammals (southern elephant seals Mirounga leonina). Significant differences in δ13C values among species were noted with a great overlap between seabird species and M. leonina. As expected, significant differences in δ15N values among species were found due to interspecific variations in diet-related to their trophic position within the marine food web. The lowest Hg concentrations were registered in E. superba (0.007 ± 0.008 µg g-1) and the highest values in M. giganteus (12.090 ± 14.177 µg g-1). Additionally, a significant positive relationship was found between Hg concentrations and trophic levels (reflected by δ15N values), biomagnifying nearly 2 times its concentrations at each level. Our results support that trophic interaction is the major pathway for Hg biomagnification in Southern Ocean ecosystems and warn about an increase in the effects of Hg on long-lived (and high trophic level) Antarctic predators under climate change in the future.


Assuntos
Charadriiformes , Euphausiacea , Mercúrio , Spheniscidae , Animais , Regiões Antárticas , Bioacumulação , Charadriiformes/metabolismo , Ecossistema , Monitoramento Ambiental/métodos , Euphausiacea/metabolismo , Cadeia Alimentar , Mamíferos/metabolismo , Mercúrio/análise , Spheniscidae/metabolismo
3.
Front Psychol ; 12: 645734, 2021.
Artigo em Inglês | MEDLINE | ID: mdl-34489778

RESUMO

Parents in academic careers face notable challenges that may go unrecognized by university management and/or policy makers. The COVID-19 pandemic has shed light on some of these challenges, as academic parents shifted to working from home while simultaneously caring for children. On the other hand, many parents found that the shift to working from home offered new opportunities such as working more flexible hours, development of digital skillsets, and increased involvement in the education of their children. In this article we explore the work-related challenges and opportunities experienced by academic parents as a result of the COVID-19 pandemic and offer potential long-term solutions for academic parents and their universities. We use the following methods: (1) a literature review focused on identifying the work-related challenges academic parents faced prior to the pandemic, as well as the impact of the pandemic on scientists and working parents and (2) administer a world-wide survey with the goal of identifying the challenges and opportunities associated with parenting and academic work through the COVID-19 lockdown (304 total responses; 113 complete). Moving forward these findings have enabled conclusions to be drawn in order to shape a new normal. Our aim is to offer university administrators, policy makers, and community service providers with ways to provide additional support for academic parents as well as provide tools for academic parents to learn successful strategies directly from their peers.

4.
Hum Factors Ergon Manuf ; 31(4): 333-348, 2021 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-34220186

RESUMO

The coronavirus disease 2019 (COVID-19) pandemic has had a dramatic impact on the way in which the community interacts within public spaces. Consequently, the design of these urban environments requires new approaches. It is our view that Human Factors and Ergonomics approaches can be used to provide these insights. This article explores the opportunities for making public spaces safer and more accessible for community use under pandemic conditions. The study utilizes a sociotechnical systems model of an archetype public space, developed pre-COVID-19, to explore the infrastructure and activities that are impacted by the introduction of the virus to the public space system. The aim was to identify those elements of the system that are completely unavailable under pandemic conditions, those elements that become limited in use, and those which remained unaffected by the presence of the virus. The findings show that under pandemic conditions pre-COVID-19 public spaces were surprisingly resilient with proportionally few elements within the model completely unavailable. They also demonstrate that overall, the public spaces system, while still operating, is significantly constrained in achieving and optimizing community and individual health and well-being. The insertion of five (5) urban design interventions within the system model presented unique insights into the possibilities for optimizing adaptive capacity. These interventions revealed design opportunities across several levels of the systems model. Such insights are argued to assist in not only re-establishing community access under pandemic conditions but also more inclusive access to a broader range of the community under all conditions.

5.
Physiother Res Int ; 23(3): e1713, 2018 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-29542251

RESUMO

BACKGROUND AND PURPOSE: It is important to assess the effectiveness and efficiency of water-based training programs in order to prescribe it as an alternative in cardiac rehabilitation for patients who have coronary artery disease (CAD). In these patients, autonomic dysfunction is an important physiological change strongly associated with adverse outcomes, morbidity, and mortality. Given that the beneficial effects of physical training in CAD patients have been traditionally evidenced with programs involving land-based aerobic exercises, this study aims to evaluate the effects of water aerobic exercise training (WAET) on the autonomic modulation of heart rate (HR) and body composition, in the rehabilitation of CAD patients. METHODS: Twenty-six male subjects with CAD were randomly divided into a training group (n = 14), submitted to the WAET, and a control group (n = 12). The WAET consisted of 3 weekly sessions on alternate days, totalling 48 sessions. The analysis of HR variability was used to evaluate the autonomic modulation of HR, from the recording of R-R intervals for 15 min, at rest in the supine position, and the body composition was evaluated through the bioelectrical impedance analysis. RESULTS: Only the training group participants had improvement in the HR variability indices; patterns without variation decreased (0V, p = .005) and an increase of patterns of two different variations (p < .001), Shannon entropy (p = .02), and normalized conditional entropy (p = .03), whereas the control group had an increase of 0V (p = .04) and a decrease of normalized conditional entropy (p = .01). All body composition variables remained unchanged. CONCLUSIONS: The WAET protocol improved the cardiac autonomic modulation of patients with CAD and can be considered as exercise training strategy in cardiac rehabilitation programs.


Assuntos
Composição Corporal , Reabilitação Cardíaca/métodos , Doença da Artéria Coronariana/reabilitação , Terapia por Exercício , Frequência Cardíaca , Sistema Nervoso Autônomo , Humanos , Masculino , Pessoa de Meia-Idade , Água
6.
Mol Plant Pathol ; 18(8): 1039-1051, 2017 10.
Artigo em Inglês | MEDLINE | ID: mdl-27885775

RESUMO

TAXONOMY AND HISTORY: Hemileia vastatrix Berk. and Broome (Basidiomycota, Pucciniales) was described in 1869 in eastern Africa and Ceylon as the agent of coffee leaf rust and has spread to all coffee cultivation areas worldwide. Major disease outbreaks in Asia, Africa and America caused and continue to cause severe yield losses, making this the most important disease of Arabica coffee, a cash crop for many tropical and sub-tropical countries. LIFE CYCLE AND DISEASE SYMPTOMS: Hemileia vastatrix is a hemicyclic fungus with the urediniosporic life cycle as its most important (if not only) source of inoculum. Chlorotic spots are the first macroscopic symptoms, preceding the differentiation of suprastomatal, bouquet-shaped, orange-coloured uredinia. The disease can cause yield losses of up to 35% and have a polyetic epidemiological impact on subsequent years. DISEASE CONTROL: Although the use of fungicides is one of the preferred immediate control measures, the use of resistant cultivars is considered to be the most effective and durable disease control strategy. The discovery of 'Híbrido de Timor' provided sources of resistance that have been used in several breeding programmes and that have been proven to be effective and durable, as some have been in use for more than 30 years. GENETIC DIVERSITY AND MOLECULAR PATHOGENICITY: Although exhibiting limited genetic polymorphism, the very large genome of H. vastatrix (c. 797 Mbp) conceals great pathological diversity, with more than 50 physiological races. Gene expression studies have revealed a very precocious activation of signalling pathways and production of putative effectors, suggesting that the plant-fungus dialogue starts as early as at the germ tube stage, and have provided clues for the identification of avr genes.


Assuntos
Basidiomycota/fisiologia , Coffea/microbiologia , Doenças das Plantas/microbiologia , Folhas de Planta/microbiologia , Clima Tropical , Basidiomycota/classificação , Basidiomycota/genética , Basidiomycota/patogenicidade , Filogenia , Doenças das Plantas/prevenção & controle
7.
Mar Pollut Bull ; 103(1-2): 220-226, 2016 Feb 15.
Artigo em Inglês | MEDLINE | ID: mdl-26723473

RESUMO

Cephalopod beaks found in the diet of predators have been a major source of scientific information. In this study, we evaluated the usefulness of DNA and contaminants analysis (total mercury - T-Hg) in cephalopod beaks in order to assess their applicability as tools in marine ecology studies. We concluded that, when applying DNA techniques to cephalopod beaks from Antarctic squid species, when using flesh attached to those beaks, it was possible to obtain DNA and to successfully identify cephalopod species; DNA was not found on the beaks themselves. This study also showed that it is possible to obtain information on T-Hg concentrations in beaks: the T-Hg concentrations found in the beaks were 6 to 46 times lower than in the flesh of the same cephalopod species. More research on the relationships of mercury concentrations in cephalopod beaks (and other tissues), intra- and inter-specifically, are needed in the future.


Assuntos
Bico/química , Decapodiformes/genética , Mercúrio/análise , Poluentes Químicos da Água/análise , Animais , Regiões Antárticas , Aves/fisiologia , DNA , Decapodiformes/química , Monitoramento Ambiental/métodos , Conteúdo Gastrointestinal
8.
PLoS One ; 10(9): e0137622, 2015.
Artigo em Inglês | MEDLINE | ID: mdl-26352664

RESUMO

Feathers have been widely used to assess mercury contamination in birds as they reflect metal concentrations accumulated between successive moult periods: they are also easy to sample and have minimum impact on the study birds. Moult is considered the major pathway for mercury excretion in seabirds. Penguins are widely believed to undergo a complete, annual moult during which they do not feed. As penguins lose all their feathers, they are expected to have a low individual-variability in feather mercury concentration as all feathers are formed simultaneously from the same somatic reserves. This assumption is central to penguin studies that use feathers to examine the annual or among-individual variation in mercury concentrations in penguins. To test this assumption, we measured the mercury concentrations in 3-5 body feathers of 52 gentoo penguins (Pygoscelis papua) breeding at Bird Island, South Georgia (54°S 38°W). Twenty-five percent of the penguins studied showed substantial within-individual variation in the amount of mercury in their feathers (Coefficient of Variation: 34.7-96.7%). This variation may be caused by differences in moult patterns among individuals within the population leading to different interpretations in the overall population. Further investigation is now needed to fully understand individual variation in penguins' moult.


Assuntos
Monitoramento Ambiental , Plumas/citologia , Mercúrio/isolamento & purificação , Animais , Plumas/química , Mercúrio/toxicidade , Spheniscidae
9.
Front Plant Sci ; 6: 74, 2015.
Artigo em Inglês | MEDLINE | ID: mdl-25741355

RESUMO

In higher plants cysteine biosynthesis is catalyzed by O-acetylserine(thiol)lyase (OASTL) and represents the last step of the assimilatory sulfate reduction pathway. It is mainly regulated by provision of O-acetylserine (OAS), the nitrogen/carbon containing backbone for fixation of reduced sulfur. OAS is synthesized by Serine acetyltransferase (SERAT), which reversibly interacts with OASTL in the cysteine synthase complex (CSC). In this study we identify and characterize the SERAT gene family of the crop plant Vitis vinifera. The identified four members of the VvSERAT protein family are assigned to three distinct groups upon their sequence similarities to Arabidopsis SERATs. Expression of fluorescently labeled VvSERAT proteins uncover that the sub-cellular localization of VvSERAT1;1 and VvSERAT3;1 is the cytosol and that VvSERAT2;1 and VvSERAT2;2 localize in addition in plastids and mitochondria, respectively. The purified VvSERATs of group 1 and 2 have higher enzymatic activity than VvSERAT3;1, which display a characteristic C-terminal extension also present in AtSERAT3;1. VvSERAT1;1 and VvSERAT2;2 are evidenced to form the CSC. CSC formation activates VvSERAT2;2, by releasing CSC-associated VvSERAT2;2 from cysteine inhibition. Thus, subcellular distribution of SERAT isoforms and CSC formation in cytosol and mitochondria is conserved between Arabidopsis and grapevine. Surprisingly, VvSERAT2;1 lack the canonical C-terminal tail of plant SERATs, does not form the CSC and is almost insensitive to cysteine inhibition (IC50 = 1.9 mM cysteine). Upon sulfate depletion VvSERAT2;1 is strongly induced at the transcriptional level, while transcription of other VvSERATs is almost unaffected in sulfate deprived grapevine cell suspension cultures. Application of abiotic stresses to soil grown grapevine plants revealed isoform-specific induction of VvSERAT2;1 in leaves upon drought, whereas high light- or temperature- stress hardly trigger VvSERAT2;1 transcription.

10.
Mol Plant Pathol ; 16(9): 1006-10, 2015 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-25784533

RESUMO

Among the Eukaryotes, Fungi have relatively small genomes (average of 44.2 Mbp across 1850 species). The order Pucciniales (Basidiomycota) has the largest average genome size among fungi (305 Mbp), and includes the two largest fungal genomes reported so far (Puccinia chrysanthemi and Gymnosporangium confusum, with 806.5 and 893.2 Mbp, respectively). In this work, flow cytometry was employed to determine the genome size of the Bidens pilosa rust pathogen, Uromyces bidentis. The results obtained revealed that U. bidentis presents a surprisingly large haploid genome size of 2489 Mbp. This value is almost three times larger than the previous largest fungal genome reported and over 50 times larger than the average fungal genome size. Microscopic examination of U. bidentis nuclei also showed that they are not as different in size from the B. pilosa nuclei when compared with the differences between other rusts and their host plants. This result further reinforces the position of the Pucciniales as the fungal group with the largest genomes, prompting studies addressing the role of repetitive elements and polyploidy in the evolution, pathological specialization and diversity of fungal species.


Assuntos
Basidiomycota/genética , Tamanho do Genoma , Genoma Fúngico , Citometria de Fluxo
11.
J Oncol ; 2015: 571739, 2015.
Artigo em Inglês | MEDLINE | ID: mdl-25784937

RESUMO

Dental treatment of patients with leukemia should be planned on the basis of antineoplastic therapy which can be chemotherapy with or without radiotherapy and bone marrow transplantation. Many are the oral manifestations presented by these patients, arising from leukemia and/or treatment. In addition, performing dental procedures at different stages of treatment (before, during, or after) must follow certain protocols in relation to the haematological indices of patients, aimed at maintaining health and contributing to the effectiveness of the results of antineoplastic therapy. Through a literature review, the purpose of this study was to report the hematological abnormalities present in patients with leukemia, trying to correlate them with the feasibility of dental treatment at different stages of the disease. It is concluded in this paper that dental treatment in relation to haematological indices presented by patients with leukemia must follow certain protocols, mainly related to neutrophil and platelet counts, and the presence of the dentist in a multidisciplinary team is required for the health care of this patient.

12.
Front Plant Sci ; 5: 422, 2014.
Artigo em Inglês | MEDLINE | ID: mdl-25206357

RESUMO

Rust fungi (Basidiomycota, Pucciniales) are biotrophic plant pathogens which exhibit diverse complexities in their life cycles and host ranges. The completion of genome sequencing of a few rust fungi has revealed the occurrence of large genomes. Sequencing efforts for other rust fungi have been hampered by uncertainty concerning their genome sizes. Flow cytometry was recently applied to estimate the genome size of a few rust fungi, and confirmed the occurrence of large genomes in this order (averaging 225.3 Mbp, while the average for Basidiomycota was 49.9 Mbp and was 37.7 Mbp for all fungi). In this work, we have used an innovative and simple approach to simultaneously isolate nuclei from the rust and its host plant in order to estimate the genome size of 30 rust species by flow cytometry. Genome sizes varied over 10-fold, from 70 to 893 Mbp, with an average genome size value of 380.2 Mbp. Compared to the genome sizes of over 1800 fungi, Gymnosporangium confusum possesses the largest fungal genome ever reported (893.2 Mbp). Moreover, even the smallest rust genome determined in this study is larger than the vast majority of fungal genomes (94%). The average genome size of the Pucciniales is now of 305.5 Mbp, while the average Basidiomycota genome size has shifted to 70.4 Mbp and the average for all fungi reached 44.2 Mbp. Despite the fact that no correlation could be drawn between the genome sizes, the phylogenomics or the life cycle of rust fungi, it is interesting to note that rusts with Fabaceae hosts present genomes clearly larger than those with Poaceae hosts. Although this study comprises only a small fraction of the more than 7000 rust species described, it seems already evident that the Pucciniales represent a group where genome size expansion could be a common characteristic. This is in sharp contrast to sister taxa, placing this order in a relevant position in fungal genomics research.

13.
Front Plant Sci ; 5: 88, 2014.
Artigo em Inglês | MEDLINE | ID: mdl-24672531

RESUMO

Hemileia vastatrix is the causal agent of coffee leaf rust, the most important disease of coffee Arabica. In this work, a 454-pyrosequencing transcriptome analysis of H. vastatrix germinating urediniospores (gU) and appressoria (Ap) was performed and compared to previously published in planta haustoria-rich (H) data. A total of 9234 transcripts were identified and annotated. Ca. 50% of these transcripts showed no significant homology to international databases. Only 784 sequences were shared by the three conditions, and 75% were exclusive of either gU (2146), Ap (1479) or H (3270). Relative transcript abundance and RT-qPCR analyses for a selection of genes indicated a particularly active metabolism, translational activity and production of new structures in the appressoria and intense signaling, transport, secretory activity and cellular multiplication in the germinating urediniospores, suggesting the onset of a plant-fungus dialogue as early as at the germ tube stage. Gene expression related to the production of carbohydrate-active enzymes and accumulation of glycerol in germinating urediniospores and appressoria suggests that combined lytic and physical mechanisms are involved in appressoria-mediated penetration. Besides contributing to the characterization of molecular processes leading to appressoria-mediated infection by rust fungi, these results point toward the identification of new H. vastatrix candidate virulence factors, with 516 genes predicted to encode secreted proteins.

14.
J Dent Child (Chic) ; 80(2): 97-100, 2013.
Artigo em Inglês | MEDLINE | ID: mdl-24011299

RESUMO

Epidermolysis bullosa (EB) is a rare congenital disease characterized by the formation of blisters following minimal trauma. Oral health can be compromised by oral bullae, perioral fibrosis, ankyloglossia, and a high risk for dental caries, all of which lead to a decreased quality of life. The purpose of this paper is to report the case of an 11-year-old female who presented with autosomal recessive dystrophic EB. Besides the skin manifestations, the extra- and intra-oral exams revealed lesions on the lips and mucosa, microstomia, ankyloglossia, depapillated tongue, and carious teeth. This case emphasizes that patients diagnosed with EB require multidisciplinary care, with the dentist playing an important role in oral health management.


Assuntos
Epidermólise Bolhosa Distrófica/complicações , Doenças da Boca/etiologia , Doenças da Boca/terapia , Saúde Bucal , Criança , Assistência Odontológica para Crianças , Assistência Odontológica para Doentes Crônicos , Feminino , Humanos
15.
Ecotoxicol Environ Saf ; 94: 147-52, 2013 Aug.
Artigo em Inglês | MEDLINE | ID: mdl-23735896

RESUMO

Polychlorinated biphenyls (PCBs) are lipophilic contaminants that tend to accumulate in organisms. PCBs were detected in Chelon labrosus, Liza aurata and Liza ramada, along different age groups. L. ramada presented the highest concentration, and it increased with age, whereas C. labrosus and L. aurata concentration remained constant. L. ramada high concentration can be attributed to its ecological niche, since this species is able to accumulate PCBs along its different age groups even in low environmental contamination conditions. PCBs 101, 118, 138, 149, 153, 170 and 180 were the congeners that more contributed to these species contamination, being PCB 138 and 153 the congeners with higher concentration. Mullets are edible in many countries, being important in fisheries and aquaculture. L. ramada is the most common mullet for capture and human consumption. All species presented concentrations below the regulation limit establish by the European Union, and therefore safe for human consumption.


Assuntos
Bifenilos Policlorados/metabolismo , Alimentos Marinhos/estatística & dados numéricos , Smegmamorpha/metabolismo , Poluentes Químicos da Água/metabolismo , Animais , Aquicultura/estatística & dados numéricos , União Europeia , Pesqueiros/estatística & dados numéricos , Poluição Química da Água/estatística & dados numéricos
16.
Plant Physiol Biochem ; 66: 118-26, 2013 May.
Artigo em Inglês | MEDLINE | ID: mdl-23500714

RESUMO

Grapevine (Vitis vinifera L.) is rich in phenylpropanoid compounds, namely flavonoids and stilbenes which, present in most tissues, are described as antioxidants and known to accumulate in response to biotic and abiotic stress. Grapevine is then a choice model for studying the interplay between the phenylpropanoid pathway and nutrient deficiency. Here we report the response to sulfur deficiency (-S) of flavonoids and stilbenes biosynthetic pathways in chlorophyll tissues (plantlets) and cell culture. Anthocyanins and trans-resveratrol accumulated in plantlets and trans-resveratrol glucoside in cell cultures in response to sulfur deficiency, while a significant decrease in chlorophyll was observed in -S plantlets. The up-regulation of chalcone synthase gene and the downstream flavonoid biosynthesis genes dihydroflavonol reductase and anthocyanidin synthase matched the accumulation of anthocyanins in -S V. vinifera plantlets. The mRNA level of stilbene synthase gene(s) was correlated tightly with the increase in trans-resveratrol and trans-resveratrol glucoside levels, respectively in -S plantlets and cell cultures. As a whole, the present study unveil that V. vinifera under sulfur deficiency allocates resources to the phenylpropanoid pathway, probably consecutive to inhibition of protein synthesis, which can be advantageous to resist against oxidative stress symptoms evoked by -S conditions.


Assuntos
Regulação Enzimológica da Expressão Gênica , Regulação da Expressão Gênica de Plantas , Estilbenos/metabolismo , Enxofre/farmacologia , Vitis/metabolismo , Aciltransferases/genética , Aciltransferases/metabolismo , Antocianinas/genética , Antocianinas/metabolismo , Técnicas de Cultura de Células , Clorofila/metabolismo , Genes de Plantas , Células Vegetais/efeitos dos fármacos , Células Vegetais/metabolismo , Proteínas de Plantas/genética , Proteínas de Plantas/metabolismo , RNA Mensageiro/genética , RNA Mensageiro/metabolismo , Resveratrol , Transcrição Gênica , Regulação para Cima , Vitis/efeitos dos fármacos , Vitis/genética
17.
Plant Signal Behav ; 4(12): 1128-35, 2009 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-20514227

RESUMO

In plants, cytokinin (CK) perception and signaling pathway is composed by a histidine kinase receptor (HK) and a response regulator (RR), the signal being mediated by a histidine phosphotransfer (HPt), as described in Arabidopsis, maize and rice. From database searches we identified in grapevine three HKs, three HPs, four A-type RRs and six B-type RRs, suggesting a common mechanism for grapevine. The phylogenetic analysis of these Vitis genes showed a variable but high degree of homology with Arabidopsis sequences. When sulfate was withdrawn from the culture medium (-S) of in vitro Vitis shoots, we assessed a significant reduction in shoot branching. To ascertain the crosstalk of S status with CK signaling in grapevine, control and -S grown shoots and control, -S and -CK cell suspensions were used as experimental systems. Real-time PCR was elected to quantify the expression of key genes. The expression of CK receptor genes was downregulated in -S cells while not affected in -CK cells. In differentiated shoots no response to -S was observed on those genes. A-type VvRRa4 was downregulated in -S or -CK cells while Vitis B-type RRs did not respond either to CK or S starvation. The results suggest that Vitis CK signaling pathway is affected by -S, although differently according to the model system. Transcription of Vitis apical meristem-identity genes VvWUS, VvCLV and VvSTM and axillary meristem genes VvBRC1, VvBRC2, VvLAS, VvRAX and VvREV was estimated and VvSTM and VvLAS showed to be downregulated in -S. Then, the expression levels of VvSTM and VvLAS make them strong candidates to be associated with the branching pattern of Vitis shoots in -S.


Assuntos
Citocininas/metabolismo , Regulação da Expressão Gênica de Plantas , Meristema/metabolismo , Transdução de Sinais , Enxofre/deficiência , Vitis/metabolismo , Meristema/genética , Meristema/crescimento & desenvolvimento , Filogenia , Vitis/genética , Vitis/crescimento & desenvolvimento
18.
Rev. Assoc. Paul. Cir. Dent ; 61(6): 453-456, nov.-dez. 2007. ilus
Artigo em Português | LILACS, BBO - Odontologia | ID: lil-540230

RESUMO

A doença de von Willebrand é a mais comum das doenças hereditárias de coagulação, caracterizada por uma anormalidade quantitativa ou qualitativa do fator von Willebrand, glicoproteína presente no plasma, plaquetas e células endoteliais. Resulta em duplo defeito hemorrágico, caracterizado por tempo de sangramento prolongado e níveis plasmáticos baixos do fator VIII de coagulação. É importante que o cirurgião-dentista conheça essa entidade e os riscos originários da mesma. O trabalho conjunto desse profissional e do hematologista é essencial para a segurança nas abordagens odontológicas em portadores dessa doença. Este artigo relata um caso clínico envolvendo a extração de molares permanentes em portador de von Willebrand do tipo 1, com ênfase na utilização de acetato de desmopressin e ácido tranexâmico para a prevenção de quadro hemorrágico.


von Willebrand's disease is the most commom of the coagulation hereditary disorders and it is characterized by a quantitative and a qualitative abnormality of the von Willebrand's factor, which is a glycoprotein found in plasma, platelets and endothelial cells. It has a double bleeding defect characterized by a prolonged bleeding time and lower plasmatic levels of the clotting VIII factor. It is important that the clinician knows this disease and the risks that it involves. It is essential that dentists and hematologists work together in order to give a secure treatment to von Willebrand carriers. This clinical case describes a dental treatment, which involved permanent molars extraction in a thirteen years old patient, with type 1 von Willebrand disease, emphasizing the use of desmopressin acetate and tranexamic acid in prevention of the hemorragic aspect.


Assuntos
Humanos , Masculino , Criança , Transtornos Hemorrágicos , Condutas Terapêuticas Homeopáticas , Extração Dentária , Doenças de von Willebrand , Coagulação Sanguínea , Dente Molar
19.
J. bras. aids ; 5(4): 165-169, jul-ago.2004. tab
Artigo em Português | LILACS, Sec. Est. Saúde SP | ID: lil-393848

RESUMO

Este trabalho foi desenvolvido no Nucleo de Biblioteca do Centro de Referencia e Treinamento em DST/AIDS, sede do Programa Estadual DST/AIDS SP, primeira especializada em acervos bibliograficos em assuntos DST/HIV/AIDS no Estado de São Paulo. Com o passar dos anos seu nucleo diretivo diagnosticou que esse serviço deveria tornar-se mais visivel intra e extra Instituicao; sentiu-se a necessidade de construir o retrato da biblioteca, o que ela oferece aos seus usuarios, conhecer o que seus usuarios pensam deste servico e identificar onde se necessita de uma nova resposta de melhoria. Para que essas metas fossem atingidas foi elaborado um relatorio das atividades internas, foi feita pesquisa de satisfacao aplicada junto aos nossos usuarios internos da Instituicao e externos(comunidade medico cientifica, outros profissionais da area, pacientes e comunidade em geral), e foi realizada uma analise qualitativa/quantitativa da frequencia dos usuarios; concomitantemente, foi feito um levantamento dos processos de trabalho e uma analise dos resultados para avaliacao do servico prestado. Ainda, com esse retrato possibilitou-se trazer resultados nos quais deparamos com questoes que contribuiram para uma constante busca de implementacao dos processos internos de trabalho, da ampliaçao das acoes de humanizacao e acolhimento aos nossos usuários, alem de elaborar diagnostico para avaliacao dos servicos prestados, aprimoramento fisico estrutural, ampliacao da capacidade produtiva, sistematiacao e agiliacao dos processos tecnicos, sempre tendo como foco o nosso publico de pesquisadores em DST/HIV/AIDS.


Assuntos
Biblioteconomia , Infecções Sexualmente Transmissíveis , Síndrome da Imunodeficiência Adquirida
20.
J. bras. aids ; 5(4): 165-169, jul-ago.2004. tab
Artigo em Pt | ACV-CRTAIDS, ACV-CRTAIDS, SESSP-DSTPROD, Sec. Est. Saúde SP | ID: crt-5537

RESUMO

Este trabalho foi desenvolvido no Nucleo de Biblioteca do Centro de Referencia e Treinamento em DST/AIDS, sede do Programa Estadual DST/AIDS SP, primeira especializada em acervos bibliograficos em assuntos DST/HIV/AIDS no Estado de São Paulo. Com o passar dos anos seu nucleo diretivo diagnosticou que esse serviço deveria tornar-se mais visivel intra e extra Instituicao; sentiu-se a necessidade de construir o retrato da biblioteca, o que ela oferece aos seus usuarios, conhecer o que seus usuarios pensam deste servico e identificar onde se necessita de uma nova resposta de melhoria. Para que essas metas fossem atingidas foi elaborado um relatorio das atividades internas, foi feita pesquisa de satisfacao aplicada junto aos nossos usuarios internos da Instituicao e externos(comunidade medico cientifica, outros profissionais da area, pacientes e comunidade em geral), e foi realizada uma analise qualitativa/quantitativa da frequencia dos usuarios; concomitantemente, foi feito um levantamento dos processos de trabalho e uma analise dos resultados para avaliacao do servico prestado. Ainda, com esse retrato possibilitou-se trazer resultados nos quais deparamos com questoes que contribuiram para uma constante busca de implementacao dos processos internos de trabalho, da ampliaçao das acoes de humanizacao e acolhimento aos nossos usuários, alem de elaborar diagnostico para avaliacao dos servicos prestados, aprimoramento fisico estrutural, ampliacao da capacidade produtiva, sistematiacao e agiliacao dos processos tecnicos, sempre tendo como foco o nosso publico de pesquisadores em DST/HIV/AIDS. (AU)


Assuntos
Biblioteconomia , Síndrome da Imunodeficiência Adquirida , Infecções Sexualmente Transmissíveis
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