ABSTRACT
Magnetic microparticles (MPs) have been recently proposed as a new and promising tool for restoring eutrophicated waters. In this study, we analyzed the acute (immobilization) and chronic effects of iron (Fe) MPs on Daphnia magna and on the benthic macroinvertebrate Chironomus sp. In the chronic toxicity tests the offspring production (male and female) in D. magna and the mortality of larvae and pupae, and adult emergence in Chironomus sp. experiments were used as the endpoints. The concentration of MPs that caused 50% of immobilized individuals (EC50) in the acute toxicity test was much higher in D. magna (0.913g MPs l-1) than in Chironomus sp. (0.445g MPs l-1). The results of chronic toxicity tests in D. magna showed that in presence of dissolved Fe (dFe), parthenogenetic reproduction was significantly affected, while no significant effect on mortality of larvae and pupae and on adult emergence was detected in Chironomus sp. test. Taking into account both that long-term exposure is not likely to occur and the regular dose of MPs potentially used in a restoration plan, we conclude that MPs is a riskless (no toxic effect on planktonic and benthic organisms) and efficient (high P adsorption capacity) tool for lake restoration.
Subject(s)
Chironomidae/drug effects , Daphnia/drug effects , Iron/toxicity , Animals , Environmental Restoration and Remediation , Female , Magnetic Phenomena , Male , Toxicity Tests, Acute , Toxicity Tests, ChronicABSTRACT
Our study focuses on the oxidative state of two aquatic insects of the order Plecoptera belonging to the family Perlidae, namely Dinocras cephalotes (Curtis, 1827) and Perla bipunctata Pictet, 1833. These species are widely distributed throughout the Western Palearctic region and coexist in the stream where individuals for this study come from. We highlight the physiological strategies of these two different predator species of stoneflies, showing a higher accumulation of lipid reserves in P. bipunctata, higher glucose levels in the body tissues of D. cephalotes and a higher capacity of the antioxidant enzymes in P. bipunctata, what provides it a protection against oxidation of lipids, which are greater in this species. This leads to a similar oxidative state in both species. Based on these results is discussed how two close related species developing a very similar ecological role in the same habitat can achieve a similar fitness with differences in their physiological strategies.
Subject(s)
Insecta/physiology , Lipid Metabolism , Lipid Peroxidation/physiology , Animals , Glucose/metabolism , Insecta/metabolismABSTRACT
The aim of the present study is to determine whether a relationship exists between the maximum lifespan potential (MLSP) of different fish species (Squalius pyrenaicus, Cyprinus carpio, Carassius auratus, Luciobarbus sclateri and Oncorhynchus mykiss) and the oxidative state of brain and liver. For this purpose, the activity of the antioxidant enzymes superoxide dismutase (SOD), catalase, glutathione peroxidase (GPX), glutathione reductase (GR), glutathione S-transferase (GST) and DT-diaphorase (NAD(P)H:quinone oxidoreductase1) were measured together with the lipid peroxidation degree (malondialdehyde, MDA) in liver and brain tissues of the collected species. Only the brain tissue manifested a higher activity of the antioxidant enzymes superoxide dismutase, glutathione peroxidase, and glutathione S-transferase in addition to a negative correlation between the values of MDA and MLSP among the different fish species. Hypotheses are proposed from the analysis of the obtained results that open new areas of research and converge on the importance of the theory of free radicals in the processes that condition the maximum life expectancy of an animal species.
Subject(s)
Brain/enzymology , Fishes/metabolism , Life Expectancy , Liver/enzymology , Oxidative Stress/physiology , Animals , Antioxidants/metabolism , Brain/metabolism , Catalase/metabolism , Free Radicals/metabolism , Glutathione Peroxidase/metabolism , Glutathione Reductase/metabolism , Glutathione Transferase/metabolism , Lipid Peroxidation/physiology , Liver/metabolism , NAD(P)H Dehydrogenase (Quinone)/metabolism , Superoxide Dismutase/metabolismABSTRACT
Plecoptera (Perlidae) are among the major macroinvertebrate predators in stream ecosystems and one of the insect families with lower tolerance to environmental alterations, being usually employed as bioindicators of high water ecological quality. The differences in the trophic roles of the coexisting species have been exclusively studied from their gut contents, while no data are available on the comparative digestive capacity. In the present paper, we make a comparative study of the activity of several digestive enzymes, namely proteases (at different pH), amylase, lipase, trypsin and chymotrypsin, in two species of stoneflies, Perla bipunctata and Dinocras cephalotes, which cohabit in the same stream. The study of digestive enzyme activity together with the analysis of gut contents can contribute to a better understanding of the ecology of these aquatic insects and their role in freshwater food webs. Thus, our results show that the two studied predator species inhabiting in the same stream present specializations on their feeding behaviors, facilitating their coexistence, and also differences in their capacity of use the resources. One of the main findings of this study is that D. cephalotes is able to assimilate a wider trophic resource spectrum and this could be one of the reasons why this species has a wider global distribution in all its geographical range.
Subject(s)
Amylases/metabolism , Aquatic Organisms/enzymology , Insect Proteins/metabolism , Insecta/enzymology , Peptide Hydrolases/metabolism , Animals , Aquatic Organisms/physiology , Diet , Gastrointestinal Contents/enzymology , Hydrogen-Ion Concentration , Insecta/physiologyABSTRACT
The digestive enzymes of two stoneflies species, Hemimelaena flaviventris and Isoperla morenica, were studied for the first time. These species are temporary water inhabitants and exhibit great feeding plasticity. Although they are traditionally referred to as predators, a previous study revealed that H. flaviventris incorporates some diatoms into its diet in addition to feeding usually on several prey, and I. morenica (in that study under the name of I. curtata) only feeds on animals occasionally. The enzymatic activities of digestive amylase, lipase, protease, trypsin and chymotrypsin were determined for each species at the same developmental stage. The results show that H. flaviventris has a greater digestive enzymatic pool and higher relative and absolute protease, lipase and trypsin activities than I. morenica. The latter has a relative higher amylase activity. As higher amylase activity is typical of phytophagous species and higher protease activity typical of carnivorous species; these results reveal that H. flaviventris is a more efficient zoophagous species than I. morenica. The ecological implications of these findings, including the higher secondary production of H. flaviventris in its habitat, are discussed.
Subject(s)
Amylases/metabolism , Digestive System/enzymology , Insecta/enzymology , Lipase/metabolism , Peptide Hydrolases/metabolism , Amylases/physiology , Animals , Chymotrypsin/metabolism , Chymotrypsin/physiology , Endopeptidases/metabolism , Endopeptidases/physiology , Feeding Behavior/physiology , Lipase/physiology , Motor Activity , Peptide Hydrolases/physiology , Trypsin/metabolism , Trypsin/physiologyABSTRACT
OBJECTIVE: To review the clinical, morphologic, immunohistochemical, and histogenetic characteristics of dermatofibrosarcoma protuberans with areas of giant cell fibroblastoma and explore current treatment options. METHODS: We describe the case of a 38-year-old patient with a tumor measuring 5.7 cm on the right labium majus of the vulva. Serial sections stained with hematoxylin-eosin were examined and immunohistochemical staining was performed for CD34 and PDGF receptor alpha and beta (PDFGRA and PDGFRB). RESULTS: The histologic study showed spindle-cell proliferation typical of dermatofibrosarcoma protuberans and other areas containing fibrosis and giant cells lining pseudovascular spaces. Both tumor areas expressed CD34, PDGFRA, and PDGFRB. CONCLUSIONS: Only two cases of dermatofibrosarcoma protuberans with areas of giant cell fibroblastoma in the vulva have been reported to date. Both dermatofibrosarcoma protuberans and giant cell fibroblastoma are characterized by the translocation t (17;22) (q22;q13). The fact that PDGFRA and PDGFRB are overexpressed in these tumors opens new treatment options with imatinib. Surgical excision with wide margins or Mohs micrographic surgery continues to be the treatment of choice.
Subject(s)
Dermatofibrosarcoma/diagnosis , Giant Cell Tumors/diagnosis , Skin Neoplasms/diagnosis , Vulvar Neoplasms/diagnosis , Adult , Antigens, CD34/analysis , Biopsy , Dermatofibrosarcoma/metabolism , Dermatofibrosarcoma/pathology , Dermatofibrosarcoma/surgery , Female , Giant Cell Tumors/metabolism , Giant Cell Tumors/pathology , Giant Cell Tumors/surgery , Humans , Immunohistochemistry , Platelet-Derived Growth Factor/analysis , Skin Neoplasms/metabolism , Skin Neoplasms/pathology , Skin Neoplasms/surgery , Treatment Outcome , Vulvar Neoplasms/metabolism , Vulvar Neoplasms/pathology , Vulvar Neoplasms/surgeryABSTRACT
La translucencia nucal es la expresión ecográfica del acúmulo de líquido subcutáneo en la región de la nuca fetal. La medición de la translucencia nucal se ha generalizado como método de screening de anomalías cromosómicas.E1 aumento de la translucencia nucal con cariotipo normal se ha observado en diversas malformaciones fetales, siendo las cardiopatías las más frecuentes. Presentamos cuatro casos: una cardiopatía, un defecto en la pared abdominal, una agenesia de radio y una hernia diafragmática congénita. El aumento de la translucencia nucal con cariotipo normal puede identificar fetos que requieran la realización de una ecografía especializada y ecocardiografía (AU)
Subject(s)
Adult , Pregnancy , Female , Humans , Congenital Abnormalities/diagnosis , Heart Diseases/diagnosis , Pregnancy Complications/diagnosis , Congenital Abnormalities , Tetralogy of Fallot/diagnosis , Gastroschisis/diagnosis , Abdominal Muscles/abnormalities , Pregnancy Trimester, First , Karyotyping/methodsABSTRACT
AIM: To investigate the incidence rate of diagnosed coeliac disease among the paediatric population in the province of Cáceres and the changes over the years. METHODS: The incidence rate of diagnosed coeliac disease between the years 1981 and 1999, age at diagnosis and clinical presentation form were investigated. The study was carried out over two periods: A (1981 to 1990) and B (1991 to 1999). RESULTS: The incidence rate for period A was 6.87/100,000 (CI 95%: 5.26-8.83) and for period B 16.04/100,000 (CI 95%: 12.99-19.59) (p < 0.0001). The relative risk of receiving a diagnosis of coeliac disease during the first four years of life was 2.31% (CI 95%:1.61-3.31) greater in period B than in period A. The mean age at diagnosis was 37.4 +/- 47.4 mo and 43.9 +/- 43.7 mo in A and B, respectively (p = 0.0058). The typical clinical pattern was the most frequent (83.6% in A and 58.3% in B). The mean age of introduction of gluten to the diet was 4.6 +/- 2.0 mo and 6.9 +/- 1.7 mo, for period A and B, respectively (p < 0.0001). CONCLUSION: The incidence rate of coeliac disease has increased during the two periods studied. In recent years, the relative risk of receiving a diagnosis of coeliac disease during the first four years of life has increased. The atypical clinical presentation has also increased, although the typical clinical form is still the most frequent in younger children.
Subject(s)
Celiac Disease/diagnosis , Celiac Disease/epidemiology , Adolescent , Age Factors , Age of Onset , Celiac Disease/diet therapy , Child , Child, Preschool , Female , Humans , Incidence , Infant , Infant, Newborn , Male , Retrospective Studies , Socioeconomic Factors , Spain/epidemiology , Time FactorsABSTRACT
El cáncer de mama asociado con la gestación se define como aquel que aparece durante la misma o en el primer año posparto. La asociación de cáncer de mama y gestación tiene cada vez más importancia por diferentes motivos: por un lado, el aumento de la incidencia de cáncer de mama en mujeres entre 30 y 40 años, y por otro, el retraso en la maternidad por motivos sociales o profesionales. Los ultrasonidos son la técnica de imagen inicial de elección para el diagnóstico de nódulos de mama en mujeres gestantes. El tratamiento del cáncer de mama asociado con la gestación debe seguir los mismos criterios que en mujeres no gestantes, y debe comenzar inmediatamente después del diagnóstico salvo en gestaciones muy avanzadas. Las mujeres gestantes presentan un estadio más avanzado en el momento del diagnóstico que las no gestantes debido fundamentalmente a un retardo del diagnóstico, pero a igualdad de edad y estadio la supervivencia es la misma. (AU)
Subject(s)
Adult , Pregnancy , Female , Humans , Pregnancy Complications, Neoplastic/diagnosis , Breast Neoplasms/complications , Breast Neoplasms/therapyABSTRACT
El prurito, un síntoma frecuente durante la gestación, puede ser manifestación de un gran número de enfermedades. Si nos centramos en aquellas propias del embarazo podemos distinguir dos grandes grupos. Uno en el que no hay lesiones dermatológicas propias, formado por la colestasis intrahepática del embarazo, y su forma menor el prurito gestacional. Y otro más amplio y eminentemente dermatológico, caracterizado por la aparición de diversas lesiones en la piel. El tratamiento sintomático inicial es común para todos los procesos, y consiste en la administración de antipruriginosos tópicos.En el presente trabajo enfocamos este síntoma desde una perspectiva eminentemente práctica que permite de forma sencilla su diagnóstico diferencial, manejo, y orientación terapéutica inicial (AU)
Subject(s)
Pruritus , Antipruritics , Cholestasis, Intrahepatic , Pregnancy Complications, Infectious , Pemphigoid GestationisABSTRACT
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