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1.
Nat Ecol Evol ; 6(6): 701-708, 2022 06.
Article in English | MEDLINE | ID: mdl-35379939

ABSTRACT

Human impact increasingly alters global ecosystems, often reducing biodiversity and disrupting the provision of essential ecosystem services to humanity. Therefore, preserving ecosystem functioning is a critical challenge of the twenty-first century. Coral reefs are declining worldwide due to the pervasive effects of climate change and intensive fishing, and although research on coral reef ecosystem functioning has gained momentum, most studies rely on simplified proxies, such as fish biomass. This lack of quantitative assessments of multiple process-based ecosystem functions hinders local and regional conservation efforts. Here we combine global coral reef fish community surveys and bioenergetic models to quantify five key ecosystem functions mediated by coral reef fishes. We show that functions exhibit critical trade-offs driven by varying community structures, such that no community can maximize all functions. Furthermore, functions are locally dominated by few species, but the identity of dominant species substantially varies at the global scale. In fact, half of the 1,110 species in our dataset are functionally dominant in at least one location. Our results reinforce the need for a nuanced, locally tailored approach to coral reef conservation that considers multiple ecological functions beyond the effect of standing stock biomass.


Subject(s)
Coral Reefs , Ecosystem , Animals , Biodiversity , Biomass , Climate Change
2.
PeerJ ; 9: e10925, 2021.
Article in English | MEDLINE | ID: mdl-33854832

ABSTRACT

Over the past few decades, coral reef ecosystems have been lost at accelerated rates as a result of global climate change and local stressors. Local management schemes can help improve the condition of coral reefs by enhancing their ecosystem recovery capacity. Caribbean conservation efforts include mitigation of local anthropogenic stressors, and integrating social participation. Here, we analyzed the case of the Bayahibe reefs in the Southeastern (SE) Dominican Republic to identify conservation actions and illustrate a conceptual example of local seascape management. We assessed reef health indicators from 2011 to 2016. Overall, our results show increases in total fish biomass, in both commercial and herbivorous fishes. Mean live coral cover was 31% and fleshy macroalgae was 23% after multiple disturbances such as Hurricanes Sandy and Isaac (2012), Mathew (2016) and heat stress presented in the study area in 2015. We also described actions taken by stakeholders and government institutions, including the implementation of a policy declaring an area of 869,000 ha as a marine protected area (MPA), enhanced water quality treatment, local restrictions to vessel traffic, enforcement of fishing regulations, and the removal of invasive lionfish (Pterois spp.). In addition, a restoration program for the threatened staghorn coral (Acropora cervicornis) was established in 2011, and currently has eight coral nurseries and six outplanting sites. Considering the biology and ecology of these reefs, we observed good results for these indicators (live coral cover, fish biomass, and water quality) in contrast with severely degraded Caribbean reefs, suggesting that optimizing local management may be a useful example for improving reef condition. Our results provide an overview of trends in reef condition in the SE Dominican Republic and could support current strategies to better protect reefs in the region. Given that Caribbean coral reefs face extreme challenges from global climate change, management measures may improve reef conditions across the region but stronger policy processes and increased scientific knowledge are needed for the successful management of coral reefs.

3.
PLoS One ; 15(8): e0228477, 2020.
Article in English | MEDLINE | ID: mdl-32756569

ABSTRACT

Coral reefs worldwide are degrading due to climate change, overfishing, pollution, coastal development, coral bleaching, and diseases. In areas where the natural recovery of an ecosystem is negligible or protection through management interventions insufficient, active restoration becomes critical. The Reef Futures symposium in 2018 brought together over 400 reef restoration experts, businesses, and civil organizations, and galvanized them to save coral reefs through restoration or identify alternative solutions. The symposium highlighted that solutions and discoveries from long-term and ongoing coral reef restoration projects in Spanish-speaking countries in the Caribbean and Eastern Tropical Pacific were not well known internationally. Therefore, a meeting of scientists and practitioners working in these locations was held to compile the data on the extent of coral reef restoration efforts, advances and challenges. Here, we present unpublished data from 12 coral reef restoration case studies from five Latin American countries, describe their motivations and techniques used, and provide estimates on total annual project cost per unit area of reef intervened, spatial extent as well as project duration. We found that most projects used direct transplantation, the coral gardening method, micro-fragmentation or larval propagation, and aimed to optimize or scale-up restoration approaches (51%) or provide alternative, sustainable livelihood opportunities (15%) followed by promoting coral reef conservation stewardship and re-establishing a self-sustaining, functioning reef ecosystems (both 13%). Reasons for restoring coral reefs were mainly biotic and experimental (both 42%), followed by idealistic and pragmatic motivations (both 8%). The median annual total cost from all projects was $93,000 USD (range: $10,000 USD-$331,802 USD) (2018 dollars) and intervened a median spatial area of 1 ha (range: 0.06 ha-8.39 ha). The median project duration was 3 years; however, projects have lasted up to 17 years. Project feasibility was high with a median of 0.7 (range: 0.5-0.8). This study closes the knowledge gap between academia and practitioners and overcomes the language barrier by providing the first comprehensive compilation of data from ongoing coral reef restoration efforts in Latin America.


Subject(s)
Conservation of Natural Resources/methods , Coral Reefs , Environmental Restoration and Remediation/methods , Animals , Anthozoa/growth & development , Caribbean Region , Climate Change , Ecosystem , Fisheries , Forecasting , Humans , Latin America , Pacific Ocean
4.
Ecol Evol ; 10(9): 3844-3855, 2020 May.
Article in English | MEDLINE | ID: mdl-32489615

ABSTRACT

Lionfish (Pterois volitans) have rapidly invaded the tropical Atlantic and spread across the wider Caribbean in a relatively short period of time. Because of its high invasion capacity, we used it as a model to identify the connectivity among nine marine protected areas (MPAs) situated in four countries in the Gulf of Mexico and the Caribbean Sea. This study provides evidence of local genetic differentiation of P. volitans in the Gulf of Mexico and the Caribbean Sea. A total of 475 lionfish samples were characterized with 12 microsatellites, with 6-20 alleles per locus. Departures from Hardy-Weinberg equilibrium (HWE) were found in 10 of the 12 loci, all caused by heterozygous excess. Moderate genetic differentiation was observed between Chiriviche, Venezuela and Xcalak, México localities (F ST = 0.012), and between the Los Roques and the Veracruz (F ST = 0.074) sites. STRUCTURE analysis found that four genetic entities best fit our data. A unique genetic group in the Gulf of Mexico may imply that the lionfish invasion unfolded both in a counterclockwise manner in the Gulf of Mexico. In spite of the notable dispersion of P. volitans, our results show some genetic structure, as do other noninvasive Caribbean fish species, suggesting that the connectivity in some MPAs analyzed in the Caribbean is limited and caused by only a few source individuals with subsequent genetic drift leading to local genetic differentiation. This indicates that P. volitans dispersion could be caused by mesoscale phenomena, which produce stochastic connectivity pulses. Due to the isolation of some MPAs from others, these findings may hold a promise for local short-term control of by means of intensive fishing, even in MPAs, and may have regional long-term effects.

5.
Biomed Mater Eng ; 30(5-6): 541-558, 2020.
Article in English | MEDLINE | ID: mdl-31903978

ABSTRACT

This study investigated the effect of three different parameters of a dental implant on stress and strain values in the peri-implant bone by finite element analysis. In this work, the effect of diameter, length and elastic modulus on the biomechanical behavior of a new dental implant was simulated using the finite element method. A three-dimensional model of a mandible segment corresponding to the premolar region and twelve dental implant models were obtained. Loads in three directions were distributed on the surface of the coronal area of the dental implants. The dental implant models were obtained in the FreeCAD 0.16 software and the simulations were made using the Abaqus/CAE software. In all cases, higher stress concentrations were obtained in the peri-implant cortical bone between 40.6 and 62.8 MPa, while the highest levels of strain were observed in the peri-implant trabecular bone between 0.002544 and 0.003873. In general, the highest von Mises equivalent stress values were observed in the peri-implant cortical bone. However, in this bone, both the maximum von Mises equivalent stress values and the von Mises strain are similar or inferior to those reported in different studies by finite element for other models of dental implants under immediate loading. Maximum von Mises strain values were observed in peri-implant trabecular bone. However, in this bone strains levels were obtained that maintain bone density or increase it. The effect of the three simulated variables (implant diameter, length, and elastic modulus) have a statistically significant influence on the von Mises equivalent stress and in von Mises strain values.


Subject(s)
Bone-Implant Interface , Dental Implants , Dental Prosthesis Design , Dental Stress Analysis/methods , Finite Element Analysis , Biomechanical Phenomena/physiology , Bone-Implant Interface/pathology , Bone-Implant Interface/physiopathology , Dental Implants/standards , Elastic Modulus , Humans , Imaging, Three-Dimensional , Mandible/pathology , Mandible/physiology , Models, Dental , Stress, Mechanical , Weight-Bearing/physiology
6.
Theranostics ; 7(13): 3369-3386, 2017.
Article in English | MEDLINE | ID: mdl-28900516

ABSTRACT

With the goal of improving intraoperative cancer visualization, we have developed AVB-620, a novel intravenously administered, in vivo fluorescent peptide dye conjugate that highlights malignant tissue and is optimized for human use. Matrix metalloproteinases (MMPs) hydrolyze AVB-620 triggering tissue retention and a ratiometric fluorescence color change which is visualized using camera systems capable of imaging fluorescence and white light simultaneously. AVB-620 imaging visualizes primary tumors and demonstrated high in vivo diagnostic sensitivity and specificity (both >95%) for identifying breast cancer metastases to lymph nodes in two immunocompetent syngeneic mouse models. It is well tolerated and single-dose toxicology studies in rats determined a no-observed-adverse-effect-level (NOAEL) at >110-fold above the imaging and estimated human dose. Protease specificity and hydrolysis kinetics were characterized and compared using recombinant MMPs. To understand the human translation potential, an in vitro diagnostic study was conducted to evaluate the ability of AVB-620 to differentiate human breast cancer tumor from healthy adjacent tissue. Patient tumor tissue and healthy adjacent breast tissue were homogenized, incubated with AVB-620, and fluorogenic responses were compared. Tumor tissue had 2-3 fold faster hydrolysis than matched healthy breast tissue; generating an assay sensitivity of 96% and specificity of 88%. AVB-620 has excellent sensitivity and specificity for identifying breast cancer in mouse and human tissue. Significant changes were made in the design of AVB-620 relative to previous ratiometric protease-activated agents. AVB-620 has pharmaceutical properties, fluorescence ratio dynamic range, usable diagnostic time window, a scalable synthesis, and a safety profile that have enabled it to advance into clinical evaluation in breast cancer patients.


Subject(s)
Breast Neoplasms/diagnostic imaging , Breast Neoplasms/pathology , Fluorescent Dyes/chemistry , Oligopeptides/chemistry , Peptide Hydrolases/metabolism , Animals , Cell Line, Tumor , Female , Fluorescence Resonance Energy Transfer , Fluorescent Dyes/chemical synthesis , Fluorescent Dyes/toxicity , Humans , Hydrolysis , Kinetics , Lymph Nodes/pathology , Lymphatic Metastasis , Mice, Inbred BALB C , Proteolysis , Rats
8.
Ann Surg Oncol ; 24(11): 3167-3173, 2017 Oct.
Article in English | MEDLINE | ID: mdl-28699134

ABSTRACT

BACKGROUND: Positive surgical margins remain a significant challenge in breast cancer surgery. This report describes the use of a novel, first-in-human ratiometric activatable cell-penetrating peptide in breast cancer surgery. METHODS: A two-part, multi-institutional phase 1 trial of AVB-620 with a 3+3 dose escalation and dose-expansion cohorts was conducted. The patients received an infusion of AVB-620 2-20 h before planned lumpectomy/mastectomy and sentinel node biopsy/axillary dissection. Imaging analysis was performed on images obtained from the surgical field as well as post-excision surgical specimens. Pathology reports were obtained to correlate imaging results with histopathologic data. Information on physical adverse events and laboratory abnormalities were recorded. RESULTS: A total of 27 patients received infusion of AVB-620 and underwent surgical excision of breast cancer. The findings showed no adverse events or laboratory values attributable to infusion of AVB-620. The 8-mg dose was selected from the dose-escalation cohort for use with the expansion cohort based on imaging data. Region-of-interest (ROI) imaging analysis from the 8-mg cohort demonstrated measurable changes between pathology confirmed tumor-positive and tumor-negative tissue. CONCLUSION: Intraoperative imaging of surgical specimens after infusion with AVB-620 allowed for real-time tumor detection. Infusion of AVB-620 is safe and may improve intraoperative detection of malignant tissue during breast cancer operations.


Subject(s)
Breast Neoplasms/diagnosis , Cell-Penetrating Peptides/metabolism , Fluorescence , Mastectomy , Molecular Imaging/methods , Surgery, Computer-Assisted/methods , Adult , Aged , Breast Neoplasms/diagnostic imaging , Breast Neoplasms/metabolism , Breast Neoplasms/surgery , Carcinoma, Ductal, Breast/diagnosis , Carcinoma, Ductal, Breast/diagnostic imaging , Carcinoma, Ductal, Breast/metabolism , Carcinoma, Ductal, Breast/surgery , Carcinoma, Lobular/diagnosis , Carcinoma, Lobular/diagnostic imaging , Carcinoma, Lobular/metabolism , Carcinoma, Lobular/surgery , Cohort Studies , Female , Follow-Up Studies , Humans , Intraoperative Care , Middle Aged , Prognosis , Receptor, ErbB-2/metabolism , Receptors, Estrogen/metabolism , Receptors, Progesterone/metabolism , Survival Rate
9.
Biol Bull ; 232(1): 58-70, 2017 02.
Article in English | MEDLINE | ID: mdl-28445091

ABSTRACT

The genus Siderastrea exhibits high levels of morphological variability. Some of its species share similar morphological characteristics with congeners, making their identification difficult. Siderastrea stellata has been reported as an intermediary of S. siderea and S. radians in the Brazilian reef ecosystem. In an earlier study conducted in Mexico, we detected Siderastrea colonies with morphological features that were not consistent with some siderastreid species previously reported in the Gulf of Mexico. Thus, we performed a combined morphological and molecular analysis to identify Siderastrea species boundaries from the Gulf of Mexico. Some colonies presented high morphologic variability, with characteristics that corresponded to Siderastrea stellata. Molecular analysis, using the nuclear ITS and ITS2 region, corroborated the morphological results, revealing low genetic variability between S. radians and S. stellata. Since the ITS sequences did not distinguish between Siderastrea species, we used the ITS2 region to differentiate S. stellata from S. radians. This is the first report of Siderastrea stellata and its variability in the Gulf of Mexico that is supported by morphological and molecular analyses.


Subject(s)
Anthozoa/anatomy & histology , Anthozoa/genetics , Animal Distribution , Animals , Anthozoa/classification , Brazil , DNA, Ribosomal Spacer/genetics , Genetic Variation , Gulf of Mexico , Species Specificity
10.
Rev. biol. trop ; 64(3): 1077-1089, jul.-sep. 2016. tab, ilus
Article in English | LILACS | ID: biblio-958197

ABSTRACT

Abstract:Coral reefs are under intense conditions of stress caused by the anthropogenic activities in coastal areas and the increase of human population. Water effluents from urban and industrial areas carry large amounts of sediments and pollutants affecting corals populations, inducing bioerosion, increasing diseases and promoting the development of algae that compete for space with corals. In the Veracruz Reef System National Park (VRSNP) coral reefs are strongly affected by human activities carried out in the area. Gallega and Galleguilla reefs are among the most affected by wastewater discharges from the industrial (petrochemical and metallurgical) and urban areas in their vicinity. To assess the potential impact of this contamination on corals in the VRSNP, a chemical composition and morphology study of 76 Pseudodiploria colonies collected in reefs Gallega, Galleguilla, Isla Verde and Isla de Enmedio, was performed. Fragments of ~10 cm2 were collected and boric acid at 0.5 % was used to remove tissue from the skeleton; once clean, the morphology of each sample was determined with a scanning electron microscope (SEM). Subsequently, to test the chemical composition, an energy dispersion spectroscopy of X-ray chemical microanalysis (EDSX) was performed in the SEM. We found that corals from Gallega and Galleguilla reefs, located closer to human populations, presented high levels of tungsten and the skeleton exhibited multiple perforations. In contrast, corals from the farthest offshore reefs (Isla Verde and Isla de Enmedio) exhibited lower levels of tungsten and fewer perforations in their skeleton. These results demonstrated that anthropogenic activities in the NPVRS are affecting corals skeleton, highly damaging and promoting their bioerosion. The presence of traces of tungsten in the skeleton of corals is an evidence of the damage that waste discharges are causing to coral reefs. Discharges of large amounts of contaminants promoted the growth of harmful species that grow and develop into the corals skeleton, causing its bioerosion, and making them susceptible to disease and physical damage. This study is the first evidence of the effects of contamination on these species; therefore, further studies are necessary to determine the impact of pollution on their biology and survival. Rev. Biol. Trop. 64 (3): 1077-1089. Epub 2016 September 01.


ResumenLos arrecifes de coral se encuentran bajo condiciones intensas de estrés causado por las actividades antropogénicas y el incremento de las poblaciones humanas en las zonas costeras. Las descargas de aguas de origen urbano e industrial transportan sedimentos y contaminantes que afectan a las poblaciones de corales, induciendo la bioerosion, el aumento de enfermedades en los corales y promueven el desarrollo de algas que compiten por espacio con los corales. En el Parque Nacional Sistema Arrecifal Veracruzano (NPVRS) los arrecifes de coral son afectados fuertemente por las actividades humanas que se llevan a cabo en la zona. Los arrecifes Gallega y Galleguilla son de los más afectados por las descargas de aguas residuales provenientes de la industria (petroquímica y metalúrgica) y de áreas urbanas que desembocan sus aguas en las proximidades de los arrecifes. Para evaluar el posible impacto de las descargas de aguas en los corales del NPVRS, se realizó un estudio de la composición química y morfología de 76 colonias de Pseudodiploria en los arrecifes Gallega, Galleguilla, Isla Verde e Isla de Enmedio. Se recolectaron fragmentos de ~10 cm2, el tejido del esqueleto fue removido utilizando ácido bórico al 0.5 %. Una vez limpia la muestra, la morfología fue analizada con un microscopio electrónico de barrido (SEM), posteriormente, para analizar la composición química de las muestras, realizamos una espectroscopia de dispersión de energía o micro-análisis químico de rayos X (EDSX) en el SEM. Encontramos que los corales de los arrecifes Gallega y Galleguilla que se encuentran ubicados cerca de poblaciones humanas, presentan altos niveles de tungsteno y el esqueleto exhibe múltiples agujeros. En contraste, los corales de los arrecifes más lejanos (Isla Verde e Isla de En medio) mostraron niveles más bajos de tungsteno y un menor número de agujeros en su esqueleto. Nuestros resultados demuestran que las actividades antropogénicas en el NPVRS, están afectando el esqueleto de los corales y promueven la bioerosión. Las descargas de grandes cantidades de contaminantes hacia las zonas costeras, promueven el crecimiento de especies dañinas que crecen y se desarrollan dentro del esqueleto de los corales, causando bioerosión del esqueleto, haciéndolos susceptibles a enfermedades y daños físicos. Debido a que este estudio es la primera evidencia de los efectos de la contaminación sobre esta especie de corales, son necesarios más estudios para determinar el impacto de la contaminación sobre su biología y la supervivencia de los corales.


Subject(s)
Animals , Tungsten/analysis , Water Pollutants, Chemical/chemistry , Anthozoa/chemistry , Coral Reefs , Reference Values , Seawater/chemistry , Spectrometry, X-Ray Emission , Microscopy, Electron, Scanning , Environmental Monitoring , Anthozoa/anatomy & histology , Mexico
11.
Rev Biol Trop ; 64(3): 1077-89, 2016 Sep.
Article in Spanish | MEDLINE | ID: mdl-29461784

ABSTRACT

Coral reefs are under intense conditions of stress caused by the anthropogenic activities in coastal areas and the increase of human population. Water effluents from urban and industrial areas carry large amounts of sediments and pollutants affecting corals populations, inducing bioerosion, increasing diseases and promoting the development of algae that compete for space with corals. In the Veracruz Reef System National Park (VRSNP) coral reefs are strongly affected by human activities carried out in the area. Gallega and Galleguilla reefs are among the most affected by wastewater discharges from the industrial (petrochemical and metallurgical) and urban areas in their vicinity. To assess the potential impact of this contamination on corals in the VRSNP, a chemical composition and morphology study of 76 Pseudodiploria colonies collected in reefs Gallega, Galleguilla, Isla Verde and Isla de Enmedio, was performed. Fragments of ~10 cm2 were collected and boric acid at 0.5 % was used to remove tissue from the skeleton; once clean, the morphology of each sample was determined with a scanning electron microscope (SEM). Subsequently, to test the chemical composition, an energy dispersion spectroscopy of X-ray chemical microanalysis (EDSX) was performed in the SEM. We found that corals from Gallega and Galleguilla reefs, located closer to human populations, presented high levels of tungsten and the skeleton exhibited multiple perforations. In contrast, corals from the farthest offshore reefs (Isla Verde and Isla de Enmedio) exhibited lower levels of tungsten and fewer perforations in their skeleton. These results demonstrated that anthropogenic activities in the NPVRS are affecting corals skeleton, highly damaging and promoting their bioerosion. The presence of traces of tungsten in the skeleton of corals is an evidence of the damage that waste discharges are causing to coral reefs. Discharges of large amounts of contaminants promoted the growth of harmful species that grow and develop into the corals skeleton, causing its bioerosion, and making them susceptible to disease and physical damage. This study is the first evidence of the effects of contamination on these species; therefore, further studies are necessary to determine the impact of pollution on their biology and survival.


Subject(s)
Anthozoa/chemistry , Coral Reefs , Tungsten/analysis , Water Pollutants, Chemical/chemistry , Animals , Anthozoa/anatomy & histology , Environmental Monitoring , Mexico , Microscopy, Electron, Scanning , Reference Values , Seawater/chemistry , Spectrometry, X-Ray Emission
12.
Adv Exp Med Biol ; 859: 149-69, 2015.
Article in English | MEDLINE | ID: mdl-26238052

ABSTRACT

Pairs of membrane-associated molecules exhibiting fluorescence resonance energy transfer (FRET) provide a sensitive technique to measure changes in a cell's membrane potential. One of the FRET pair binds to one surface of the membrane and the other is a mobile ion that dissolves in the lipid bilayer. The voltage-related signal can be measured as a change in the fluorescence of either the donor or acceptor molecules, but measuring their ratio provides the largest and most noise-free signal. This technology has been used in a variety of ways; three are documented in this chapter: (1) high throughput drug screening, (2) monitoring the activity of many neurons simultaneously during a behavior, and (3) finding synaptic targets of a stimulated neuron. In addition, we provide protocols for using the dyes on both cultured neurons and leech ganglia. We also give an updated description of the mathematical basis for measuring the coherence between electrical and optical signals. Future improvements of this technique include faster and more sensitive dyes that bleach more slowly, and the expression of one of the FRET pair genetically.


Subject(s)
Fluorescence Resonance Energy Transfer/methods , Fluorescent Dyes/chemistry , Ganglia, Invertebrate/physiology , Membrane Potentials/physiology , Neurons/physiology , Voltage-Sensitive Dye Imaging/methods , Animals , Fluorescence Resonance Energy Transfer/instrumentation , Ganglia, Invertebrate/ultrastructure , High-Throughput Screening Assays , Leeches , Nerve Net/physiology , Nerve Net/ultrastructure , Neurons/ultrastructure , Signal-To-Noise Ratio , Single-Cell Analysis/instrumentation , Single-Cell Analysis/methods , Synapses/physiology , Synapses/ultrastructure , Voltage-Sensitive Dye Imaging/instrumentation
13.
PLoS One ; 8(6): e65665, 2013.
Article in English | MEDLINE | ID: mdl-23776521

ABSTRACT

Shift transitions in dominance on coral reefs from hard coral cover to fleshy macroalgae are having negative effects on Caribbean coral reef communities. Data on spatiotemporal changes in biodiversity during these modifications are important for decision support for coral reef biodiversity protection. The main objective of this study is to detect the spatiotemporal patterns of coral reef fish diversity during this transition using additive diversity-partitioning analysis. We examined α, ß and γ fish diversity from 2000 to 2010, during which time a shift transition occurred at Mahahual Reef, located in Quintana Roo, Mexico. Data on coral reef fish and benthic communities were obtained from 12 transects per geomorphological unit (GU) in two GUs (reef slope and terrace) over six years (2000, 2005, 2006, 2007, 2008, 2010). Spatial analysis within and between the GUs indicated that the γ-diversity was primarily related to higher ß-diversity. Throughout the six study years, there were losses of α, ß and γ-diversity associated spatially with the shallow (reef slope) and deeper (reef terrace) GUs and temporally with the transition in cover from mound corals to fleshy macroalgae and boulder corals. Despite a drastic reduction in the number of species over time, ß-diversity continues to be the highest component of γ-diversity. The shift transition had a negative effect on α, ß and γ-diversity, primarily by impacting rare species, leading a group of small and less vulnerable fish species to become common and an important group of rare species to become locally extinct. The maintenance of fish heterogeneity (ß-diversity) over time may imply the abetment of vulnerability in the face of local and global changes.


Subject(s)
Biodiversity , Coral Reefs , Fishes/classification , Animals , Fishes/physiology , Seaweed/classification , Seaweed/physiology
14.
Nat Biotechnol ; 24(4): 439-46, 2006 Apr.
Article in English | MEDLINE | ID: mdl-16550174

ABSTRACT

Voltage-gated ion channels regulate many physiological functions and are targets for a number of drugs. Patch-clamp electrophysiology is the standard method for measuring channel activity because it fulfils the requirements for voltage control, repetitive stimulation and high temporal resolution, but it is laborious and costly. Here we report an electro-optical technology and automated instrument, called the electrical stimulation voltage ion probe reader (E-VIPR), that measures the activity of voltage-gated ion channels using extracellular electrical field stimulation and voltage-sensitive fluorescent probes. We demonstrate that E-VIPR can sensitively detect drug potency and mechanism of block on the neuronal human type III voltage-gated sodium channel expressed in human embryonic kidney cells. Results are compared with voltage-clamp and show that E-VIPR provides sensitive and information-rich compound blocking activity. Furthermore, we screened approximately 400 drugs and observed sodium channel-blocking activity for approximately 25% of them, including the antidepressants sertraline (Zoloft) and paroxetine (Paxil).


Subject(s)
Electric Stimulation/methods , Ion Channel Gating/physiology , Membrane Potentials/physiology , Microscopy, Fluorescence/methods , Neurons/physiology , Pharmaceutical Preparations/administration & dosage , Sodium Channels/physiology , Cells, Cultured , Drug Design , Humans , Ion Channel Gating/drug effects , Membrane Potentials/drug effects , Neurons/drug effects , Patch-Clamp Techniques/methods , Sodium Channels/drug effects
15.
Recept Channels ; 8(5-6): 283-95, 2002.
Article in English | MEDLINE | ID: mdl-12690956

ABSTRACT

High throughput functional assays are increasingly relied upon to generate early and novel discovery leads for drug development. Ion transport proteins including channels, transporters, and pumps play central roles in cellular bioenergetics, excitability, and a multitude of other biological functions. Facile, robust methods for detecting ion transport activity in both native and heterologous systems is desirable for rapid functional analysis and drug discovery for these difficult but important targets. Here we discuss cell-compatible fluorescent probes, functional assays, and VIPR instrumentation that are used to monitor real-time target activity and screen large chemical libraries for potent and selective modulators. Advances and issues for both exogenously applied and fluorescent protein probes of cellular membrane potential, Ca2+, Cl-, and pH are addressed. High throughput screening (HTS) compatible, rapid kinetic and fluorescence resonance energy transfer (FRET) assays are emphasized, in particular the use of voltage-sensitive FRET probes to assay ion channel activity in single cells and 96/384-well formats.


Subject(s)
Biotechnology/methods , Ion Channels/chemistry , Aequorin/chemistry , Animals , Automation , Biochemistry/methods , Biological Transport , CHO Cells , Calcium/metabolism , Chlorine/metabolism , Cricetinae , Fluorescence Resonance Energy Transfer/methods , Green Fluorescent Proteins , Hydrogen-Ion Concentration , Ion Channels/metabolism , Ions/metabolism , Kinetics , Luminescent Proteins/metabolism , Membrane Potentials , Time Factors
16.
Rev cuba reumatol ; 4(1)2002. tab
Article in Spanish | CUMED | ID: cum-33925

ABSTRACT

Se realizó un ensayo clínico controlado en el centro Nacional de Rehabilitación Julito Díaz entre julio del 98 y abril del 2000, con el propósito de evaluar el efecto terapéutico de la Magnetoterapia sobre los pacientes fibromiálgicos. La muestra estuvo constituída por50 pacientes a los cuales se les aplicó el tratamiento farmacológico y al resto la Magnetoterapia. Para evaluar los resultados se utuilizaron varios criterios siendo el fundamental, la disminución de los puntos dolorosos al final del tratamiento. Se utilizó la escalavisual para el dolor, y test de Likert. Se demostró la eficacia de ambos métosdos terapéuticos, con predominio de efectividad del tratamiento convencional farmacológico en la reducción del dolor. Se hacen consideraciones acerca del uso del método ensayado(AU)


Subject(s)
Fibromyalgia/therapy , Complementary Therapies
17.
Article in Spanish | CUMED | ID: cum-33921

ABSTRACT

Se realizó un estudio de revisión acerca de las características epidemiológicas, clínicas, diagnósticas y terapéuticas de la osteoartritis en particular de las rodillas((gonartrosis). Luego de una amplia revisión del enfoque terapéutico farmacológico, y quirúrgico, se haceuna exposición acerca de las posibilidades de la fisioterapia y rehabilitación en la etapa pre-operatoria a modo de tratamiento profiláctico, conservador y coadyuvante del medicamentoso, así como de la rehabilitación luego del manejo quirúrgico en laconsecución de una adecuada funcionalidad y alivio del dolor en los pacientes. Se realizó un esbozo general acerca del programa Gonartrosis, onartrosis, enfoquefisioterapéutico y rehabilitador seguido por los autores(AU)


Subject(s)
Aged , Osteoarthritis/epidemiology , Osteoarthritis/diagnosis , Osteoarthritis/therapy
18.
Rev cuba reumatol ; 3(2)2001. tab
Article in Spanish | CUMED | ID: cum-33916

ABSTRACT

Se estudiaron 77 pacientes con artritis Reumatoidea en el centro nacional de rehabilitación “Julio Díaz González” encaminado a evaluar el conocimiento de la discapacidad así como de su enfermedad. Se definieron un conjunto de variables que fueron investigadas por un cuestionario que se aplicó de forma individual a todos los pacientes ingresados y que acudieron a la consulta de reumatología. Se concluye que en la artritis Reumatoidea predominó el sexo femenino, 88.2 por ciento, incide con mayor frecuencia entre los 46 y 55 años, más de la mitad de ellos tienen conocimiento de la enfermedad y de su discapacidad, orientados generalmente por profesionales de la salud, donde la terapia rehabilitadora jugó un rol fundamental al conocer estos el futuro de su enfermedad(AU)


Subject(s)
Arthritis, Rheumatoid
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