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PubMed1995

Time and frequency domain characteristics of sperm whale clicks.

Regular clicks from diving sperm whales, both large bull males and smaller females, were recorded in deep oceanic water off the Azores and subsequently sampled to computer disks for digital analysis. A total of 8540 clicks were marked and analyzed. Simple temporal analysis of the interclick intervals during feeding dives revealed mean click rates for male sperm whales of 1.1713 s-1 and 1.9455 s-1 for females. Fourier analysis showed distinctive peaks in the spectra of bull male sperm whales at 400 Hz and 2 kHz which were stable over extended periods of up to 20 mins. The clicks contained higher frequency components with energy ranging up to at least 12 kHz but not concentrated at any sharply defined frequency. The clicks of smaller female sperm whales showed similar spectral peaks, shifted to 1.2 and 3 kHz, respectively, but these peaks were less pronounced than those in the male click spectra and less stable with time. Higher frequencies were also present up to at least 15 kHz. The previously reported multiple pulse structure of sperm whale clicks is confirmed, but digital filtering reveals this structure to be frequency dependent. Analysis using the short-time Fourier transform confirms the complex time-frequency structure of individual clicks. The frequencies at which the multiples emerge in male and female clicks supports the idea of air cavities in the sperm whale head acting as sound reflectors, although the magnitude of the second pulse at high frequencies suggests some form of off axis distortion. It is also possible that air cavity resonance in the head of the sperm whale may act to reinforce the high-frequency components of the click, and that such components may have superior range and resolution performance in terms of echolocation.

Animal Communication↗

PubMed2003

Finite-frequency tomography reveals a variety of plumes in the mantle.

We present tomographic evidence for the existence of deep-mantle thermal convection plumes. P-wave velocity images show at least six well-resolved plumes that extend into the lowermost mantle: Ascension, Azores, Canary, Easter, Samoa, and Tahiti. Other less well-resolved plumes, including Hawaii, may also reach the lowermost mantle. We also see several plumes that are mostly confined to the upper mantle, suggesting that convection may be partially separated into two depth regimes. All of the observed plumes have diameters of several hundred kilometers, indicating that plumes convey a substantial fraction of the internal heat escaping from Earth.

Journal Article↗

PubMed1996

Keratin Degradation by Fervidobacterium pennavorans, a Novel Thermophilic Anaerobic Species of the Order Thermotogales.

From a hot spring of the Azores islands a novel thermophilic bacterium belonging to the Thermotogales order was isolated. This strain, which grows optimally at 70(deg)C and pH 6.5, is the first known extreme thermophile that is able to degrade native feathers at high temperatures. The enzyme system converts feather meal to amino acids and peptides. On the basis of physiological, morphological, and 16S rDNA studies the new isolate was found to be a member of the Thermotogales order and was identified as Fervidobacterium pennavorans. The strain was highly related to Fervidobacterium islandicum and Fervidobacterium pullulanolyticum. The cell-bound keratinolytic enzyme system was purified 32-fold by detergent treatment with CHAPS (3-[(3-cholamidopropyl)-dimethyl-ammonio]-1-propanesulfonate) and sodium dodecyl sulfate-polyacrylamide gel electrophoresis. The enzyme was characterized as a serine protease with a molecular mass of 130 kDa and an isoelectric point of 3.8. Optimal activity was measured at 80(deg)C and pH 10.0. Furthermore, 19 anaerobic thermophilic archaea and bacteria belonging to the orders Thermococcales, Thermoproteales, Thermotogales, and Clostridiales (growth temperatures between 60 and 105(deg)C) were tested for their abilities to grow on feathers and produce heat-stable keratinolytic enzymes. None of the tested extremophilic microorganisms was able to attack the substrate in a native form.

Journal Article↗

PubMed2002

Albidovulum inexpectatum gen. nov., sp. nov., a nonphotosynthetic and slightly thermophilic bacterium from a marine hot spring that is very closely related to members of the photosynthetic genus Rhodovulum.

Several bacterial isolates, with an optimum growth temperature of about 50 degrees C, were recovered from the marine hot spring at Ferraria on the island of São Miguel in the Azores. The geothermal water emerged from a porous lava flow and rapidly cooled in contact with seawater except at low tide. The bacterial species represented by strains FRR-10(T) and FRR-11 was nonpigmented, strictly aerobic, and organotrophic. Several genes, bchZ, pufB, pufA, pufL, or pufM, encoding the photosynthetic reaction center proteins and the core light-harvesting complexes were not detected in these strains. The organism oxidized thiosulfate to sulfate with enhancement of growth. The organism did not require additional NaCl in the culture medium for growth, but NaCl at 1.0% enhanced growth. Phylogenetic analyses using the 16S rRNA gene sequence of strain FRR-10(T) indicated that the new organism represented a new species of the alpha-3 subclass of the Proteobacteria and that it branches within the species of the genus Rhodovulum. The contradiction of classifying an organism which branches within the radiation of the genus Rhodovulum but does not possess the hallmark characteristics of this genus is discussed. However, the absence of several of these characteristics, namely, the lack of photosynthesis and pigmentation, which could be related to colonization of dark environments, and growth at high temperatures, leads to our proposal that strains FRR-10(T) and FRR-11 should be classified as a new species of a novel genus, Albidovulum inexpectatum, representing, at present, the most thermophilic organism within the alpha-3 subclass of the Proteobacteria.

Fatty Acids↗

PubMed1990

Hyperthermus butylicus, a hyperthermophilic sulfur-reducing archaebacterium that ferments peptides.

The hyperthermophilic peptide-fermenting sulfur archaebacterium Hyperthermus butylicus was isolated from the sea floor of a solfataric habitat with temperatures of up to 112 degrees C on the coast of the island of São Miguel, Azores. The organism grows at up to 108 degrees C, grows optimally between 95 and 106 degrees C at 17 g of NaCl per liter and pH 7.0, utilizes peptide mixtures as carbon and energy sources, and forms H2S from elemental sulfur and molecular hydrogen as a growth-stimulating accessory energy source but not by sulfur respiration. The same fermentation products, CO2, 1-butanol, acetic acid, phenylacetic acid, and a trace of hydroxyphenylacetic acid, are formed both with and without of S0 and H2. Its ether lipids, the absence of a mureine sacculus, the nature of the DNA-dependent RNA polymerase, and phylogenetic classification by DNA-rRNA cross-hybridization characterize H. butylicus as part of a novel genus of the major branch of archaebacteria comprising the orders Thermoproteales and Sulfolobales, representing a particularly long lineage bifurcating with the order Sulfolobales above the branching off of the genus Thermoproteus and distinct from the genera Desulfurococcus and Pyrodictium.

Archaea↗

PubMed2006

Contribution of KIR3DL1/3DS1 to ankylosing spondylitis in human leukocyte antigen-B27 Caucasian populations.

Killer cell immunoglobulin-like receptors (KIRs) and human leukocyte antigen (HLA) loci are both highly polymorphic, and some HLA class I molecules bind and trigger cell-surface receptors specified by KIR genes. We examined whether the combination of KIR3DS1/3DL1 genes in concert with HLA-B27 genotypes is associated with susceptibility to ankylosing spondylitis (AS). Two HLA-B27-positive Caucasian populations were selected, one from Spain (71 patients and 105 controls) and another from the Azores (Portugal) (55 patients and 75 controls). All were typed for HLA-B and KIR (3DS1 and 3DL1) genes. Our results show that in addition to B27, the allele 3DS1 is associated with AS compared with B27 controls (p < 0.0001 and p < 0.003 in the Spanish population and Azoreans, respectively). We also observed that the association of KIR3DS1 to AS was found in combination with HLA-B alleles carrying Bw4-I80 in trans position in the Spanish population (30.9% in AS versus 15.2% in B27 controls, p = 0.02, odds ratio (OR) = 2.49) and in Azoreans (27.2% in AS versus 8.7% in B27 controls, p = 0.01, OR = 4.4 in Azoreans). On the other hand, 3DL1 was decreased in patients compared with B27 controls (p < 0.0001 in the Spanish population and p < 0.003 in Azoreans). The presence of this allele in combination with Bw4-I80 had a protective effect against the development of AS in the Spanish population (19.7% in AS, 35.2% in B27 controls; p = 0.03, OR = 0.45). The presence of KIR3DS1 or KIR3DL1 in combination with HLA-B*27s/HLA-B Bw4-I80 genotypes may modulate the development of AS. The susceptibility to AS could be determined by the overall balance of activating and inhibitory composite KIR-HLA genotypes.

Alleles↗

PubMed2024

Oceanic islands act as drivers for the genetic diversity of marine species: Cardita calyculata (Linnaeus, 1758) in the NE Atlantic as a case-study.

Geographic distribution, as well as evolutionary and biogeographic processes and patterns of marine invertebrate benthic species are strongly shaped by dispersal ability during the life cycle. Remote oceanic islands lie at the brink of complex biotic and abiotic interactions which have significantly influenced the biodiversity patterns we see today. The interaction between geological environmental change and taxon-specific dispersal modes can influence species evolutionary patterns, eventually delimiting species-specific biogeographic regions. In this study, we compare the population genetic patterns of the marine bivalve Cardita calyculata in the northeast Atlantic, discussing the role of Macaronesian islands during past climatic cycles. The genetic structure and diversity patterns were outlined based on SSR-GBAS loci of 165 individuals and on the mitochondrial COI marker of 22 individuals from the Canary Islands, Madeira, Azores and the Mediterranean. The highly structured genetic pattern found among regions and within archipelagos suggests the central role of oceanic islands in promoting the divergence of the species in both the NE Atlantic and the Mediterranean. The high degree of divergence in the COI dataset (> 7%) suggests the existence of potential cryptic speciation that needs to be further explored with a more comprehensive sampling. Such patterns are only congruent with a scenario where C. calyculata populations were maintained during glacial/interglacial cycles, supporting the role of the studied archipelagos as drivers of diversity for marine biota. We stress the importance of developing studies for species with various life history and dispersal modes. In such a way, a more profound understanding of the biogeographic and evolutionary significance of oceanic islands can catalyse directed conservation efforts, especially in the context of the ongoing climate crisis.

Animals↗

PubMed2026

Genetic differentiation of the supralittoral gastropod Tectarius striatus (North Atlantic Archipelagos) and development of new microsatellite resources.

Microsatellite markers are invaluable tools for assessing genetic diversity and elucidating population structure across any species. This study reports the development and application of ten novel polymorphic microsatellite loci for Tectarius striatus, a littorinid species native to the shores of Macaronesia, a geographical region that includes the archipelagos of the Azores, Madeira, Selvagens, Canary Islands, and Cabo Verde. These markers together with a portion of the COI gene were used to genotype 65 individuals, using Illumina amplicon -sequencing across five geographically distinct populations. Our analysis shows moderate to high levels of allelic diversity across all populations. Furthermore, microsatellite markers supported genetic structure between a distant population of Cabo Verde Archipelago and the northern Macaronesian archipelagos. Conversely variation of the COI showed high levels of homogeneity across the sampled populations. While the presence of null alleles and moderate levels of missing data at several loci represent challenges to this study, the overall consistency of our results with earlier research underscores the reliability of microsatellite markers for population genetic inference in this marine gastropod. Nevertheless, our findings highlight the need for cautious interpretation of diversity estimates and population structure metrics, particularly when null alleles are frequent, and underscore the value of expanding the panel of available microsatellite markers for Tectarius striatus and related taxa to improve resolution and accuracy for future studies.

Animals↗

PubMed2003

Demographic and genetic structures of two partially isolated communities of Santa Catarina Island, southern Brazil.

The objectives of this study were to analyze the population structure and genetic variability of two communities, Costa da Lagoa (CLG) and São João do Rio Vermelho (SJRV), located on Santa Catarina Island in southern Brazil. The two populations descend from Azores Archipelago immigrants (Portuguese), with a minor contribution of sub-Saharan Africans and Amerindians. To estimate the relative contribution of the different ethnic groups to the current gene pool of the two communities, values of admixture were obtained using the weighted least-squares method based on allelic frequencies of the loci ABO, RHD-RHCE, GPA-GPB (MNSs), HBB, HP, TF, CP, AK, and ACP1. The origins of the studied populations can be quantified as follows: for CLG, sub-Saharan Africans (A) = 17.3%, Iberian Europeans (P) = 75.0%, and Southern Amerindians (I) = 7.7%; for SJRV, A = 48.8%, P = 44.5%, and I = 6.7%. Because haplotype frequencies of the GPA-GPB loci in SJRV were unusual, possibly as a consequence of random genetic drift, the values of admixture were recalculated after exclusion of GPA-GPB, as follows: A = 28.0%; P = 53.3%, and I = 18.7%. The total diversity (HT) was estimated as 42.29%, of which 99.6% can be attributed to the intrapopulational variability (HS). The interpopulational genetic variation (or standard distance, DST) corresponds to 0.19%, while the gene differentiation coefficient is 0.28%, indicative of low genetic difference. These results led to the conclusion that random genetic drift may have had an important effect on the Costa da Lagoa community, while presently gene flow might be the predominant evolutionary factor potentially capable of changing allele frequencies in SJRV.

Africa↗

PubMed2005

Immunohistochemical studies of epithelial cell proliferation and p53 mutation in bovine ocular squamous cell carcinoma.

Bovine ocular squamous cell carcinoma (OSCC) is the second most common cause of rejection due to neoplasia in slaughterhouses on Sao Miguel Island, Azores, and accounts for significant economic losses. To obtain a better insight into the genesis and neoplastic transformation process of bovine OSCC, abnormal protein expression and proliferation index were assessed by the immunohistochemical evaluation of p53 and Ki67, respectively. OSCC samples were collected from 15 bovines and were classified histologically according to the degree of differentiation into three categories: poorly, moderately, and well differentiated. Immunohistochemistry using polyclonal anti-human p53 antibody and polyclonal anti-human Ki67 antibody was performed. Ten of 15 tumors tested were immunoreactive for p53. Twelve tumors demonstrated Ki67 expression. As in human squamous cell carcinoma, p53 overexpression is frequent in bovine OSCC, providing support for a possible role of the protein in the pathogenesis of this neoplasia. No correlation between the percentage of p53 stained nuclei and the degree of differentiation was observed, although different patterns of staining were seen according to the degree of keratinization of the tumor cells. With the exception of the moderately differentiated OSCC group, Ki67 index showed significant correlation with the histologic pattern, increased proliferation being found in poorly differentiated OSCC (P = 0.013).

Animals↗

PubMed1991

[Machado-Joseph disease: description of 5 members of a family].

The authors report the clinical and laboratorial findings of 5 affected members (all males) of a family with Machado-Joseph disease. The mode a inheritance was autosomal dominant. The mean onset age was 38 years (range 30-50 years). The clinical picture was pleomorphic and included cerebellar ataxia, external ophthalmoplegia with bulging eyes, extrapyramidal/pyramidal syndromes, amyotrophy with fasciculations and peripheral neuropathy, in variable degrees of severity. In one patient parkinsonian rigidity was greatly improved with the use of trihexaphenidyl and L-dopa. CT scan examinations disclosed a variable degree of cerebellar atrophy, with mild cerebral atrophy in one patient. Brainstem evoked potentials were normal in two patients. EMG showed denervation in three patients. Muscle biopsy (gastrocnemium) with histochemical studies revealed chronic muscle denervation in four cases. Sural nerve biopsy with conventional pathological study was normal in four cases. This family was living in Florianopolis, Santa Catarina, where there is a great number of Portuguese descendants from the Azores Islands. The worldwide presence of the disease seems to result from the genic diffusion of the disease with the Portuguese emigration during the Great Navigations Era and with some later emigratory settlement.

Adult↗

PubMed1999

[Low-intensity laser radiation in combined treatment of urinary system tuberculosis].

Combined treatment using low-intensity laser radiation (LILR) was performed in 125 patients with urinary tuberculosis: 54 patients had combined intravascular blood laser radiation (IBLR) and external renal laser radiation, 71 patients were exposed to IBLR with an AZOR-2K device. The use of LILR in the combined treatment contributed to the stabilization of a specific process, to significant renal functional improvement, and a reduction of a postoperative period from 26 to 20 days.

Humans↗

PubMedDate not supplied

[Relationship between obesity and educational level in Portuguese young males in 1990].

OBJECTIVE: To evaluate the relationship between the educational level, weight and obesity of young Portuguese males, aged 20 years. DESIGN: Cross-sectional study, based on the national military census files of 1990, provided by the military selection centres of Portugal (north, centre, south--including Azores and Madeira islands). SUBJECTS AND METHODS: In Portugal, all males aged 20 must present themselves to the military authorities to be submitted to a health exam in order to be screened for the armed forces. The data of 70,858 young Portuguese males aged 20 were gathered. Height and weight were measured by skilled teams. The educational level was confirmed by the presentation of educational attainment certificates. The population was divided into deciles of body mass index (BMI). The whole group was classified as obese or non-obese, according to a cut-off point of 27.8 Kg/sqm. The educational level was classified in four groups: group A--less than 5 years of schooling; group B--5 to 6 years; group C--7 to 9 years; group D--> or = 10 years. The level of education in each decile of BMI was determined and the percentage of obese subjects was calculated for each level of schooling. The odds of obesity associated with each group of schooling was determined as well as their 95% confidence intervals. Statistical significance was considered to exist when p < 0.05. RESULTS: The average BMI in the study population was 22.5 Kg/sqm. A slight increase in schooling was noticed from the lowest to the highest decile of BMI. The same result was obtained when we analysed the upper extreme of the BMI distribution in greater detail. According to our criteria for obesity, the percentages of obesity in each level of schooling were as follows: group A--4.2%; group B--5%; group C--5.1%; and group D--5.4%. The odds ratio (OR) of obesity according to each education level was higher in those with a higher level of education. In fact, those with 10 or more years of schooling presented an OR = 1.05(0.94;1.17) which was not statistically significant (ns) when compared to those with 7-9 years; while an OR = 1.08(0.97;1.21), was also ns when compared to those with 5-6 years, and, finally, an OR = 1.29(1.14;1.47) was statistically significant (p < 0.001) in comparison to those with only 0-4 years of schooling. CONCLUSIONS: As major conclusions one can say that the prevalence of obesity is low among young Portuguese males (4.9%), only 2.1% with a BMI > 30 Kg/sqm. Furthermore, our results show that, in Portugal, contrary to the results found mostly in western European countries, males aged 20 years with higher levels of education are slightly more prone to be obese than others with lower levels of schooling.

Adult↗

PubMed2000

Detection of expansion regions in Portuguese bipolar families.

We have studied 24 families with multiple affected members with bipolar disorder to test the hypothesis that in those families clinically showing genetic anticipation [Macedo et al., 1999] we would find large repeat expansions. The families meeting inclusion criteria had a minimum of two affected members over two generations and showed marked anticipation both in terms of age of onset and disease severity. We used the repeat expansion detection (RED) method to test patients (n = 24) and controls from these families and unrelated controls (n = 53). We also genotyped patients and family members from two families with large expansions at the known expansion loci on chromosomes 13, 17, and 18. The RED method revealed a higher number of large expansions in patients compared with controls (t-test; P < 0.0055: Mann-Whitney U; P = 0.02). The patients with the largest expansions were typed at the specific loci on chromosomes 13, 17, and 18 and the chromosome 18 expansion locus segregated with disease in one family, and a second family showed segregation with the expansion located at the SCA8 locus on chromosome 13. Genetic anticipation had been analyzed in this cohort of families, with correction for potential ascertainment bias, possible proband effects, cohort effects, regression to the mean, gender effects, and maternal vs. paternal transmission. None of these potential confounds appeared to account for the observed anticipation. We also identified that the presence of large expansions in affected family members derives primarily from two families from the genetically isolated Azores population. One family shows segregation with the chromosome 18 locus, whereas the other family segregates with expansions at the SCA8 locus. Am. J. Med. Genet. (Neuropsychiatr. Genet.) 96:854-857, 2000.

Anticipation, Genetic↗

PubMed2001

Mortality and morbidity trends in ischemic heart disease in the autonomous region of Madeira in the ten-year period 1987-1996.

The increase in absolute number of deaths from ischemic heart disease (IHD) in the population aged > or = 65 years, in both sexes, in Madeira, when comparing the years 1987 and 1996, led to significant increases in the corresponding standardized death rates that go against the stabilization seen at national level. Significant increases in these rates for the same years were also seen in the district of Beja and in the Azores. The aim of this study was to ascertain the trends for the incidence, morbidity and mortality from acute myocardial infarction (AMI) in patients admitted in Madeira and its contribution to the increase in these rates, particularly in the population aged < 65 years of both sexes, which the number of deaths from ischemic heart disease did not increase. We studied 119 pts with AMI admitted in 1987 (year A), of whom 53 were aged < 65 years, and 186 pts with AMI admitted in 1996 (year B), of whom 72 were aged < 65 years, whose data were included in the Madeira Ischemic Heart Disease Register (RECIMA), an IHD hospital register that covers 1792 patients admitted with AMI in the Coronary Intensive Care Unit of the Department of Medical and Surgical Cardiology of Funchal Hospital over a period of 15 years (1984-1998). Mortality by the 28th day (fatal AMI admissions) in all ages fell slightly in both sexes in the two years studied (A = 19.3%; B = 16.1%). The number of fatal AMI admissions rose among females in the two age groups considered A = 11; B = 20; delta% = +45) and fell among males (A = 12; B = 10; delta% = -20). In males aged > or = 65 years, this number remained the same (A = 7; B = 7) and fell in males aged > or = 65 years (A = 5; B = 3; delta% = -40). The number of pts who survived to the 28th day (non-fatal AMI admissions) rose in all age groups for both sexes (A = 96; B = 156; delta% = +38.46), as did the ratios with deaths from IHD. These increases were roughly double in the group of patients aged 65 years compared to patients aged < 65 years. We found highly significant positive correlations in the population aged < 65 years between the number of non-fatal AMI admissions (morbidity data) and the number of deaths from IHD (mortality data) recorded in every year of the 10-year period 1987-96, these values being highly significant in both sexes (r = 0.89; p < 0.0001), in males (r = 0.87; p < 0.0001) and in females (r = 0.77; p < 0.0001). Since our study was carried out on an island on which all AMI cases are admitted to a single treatment center, we can conclude that these positive correlations represent a trend towards worsening of morbidity and mortality from IHD in Madeira in the population aged < 65 years, even though the number of deaths from IHD did not rise. The establishment of IHD registers similar to RECIMA in other regions of the country would help to identify trends in morbidity, mortality, and morbidity plus mortality in this population that would be useful in improving the orientation of resources allocated to the prevention and treatment of cardiovascular diseases.

Age Distribution↗

PubMedDate not supplied

[Low-intensity laser irradiation in patients with urinary tuberculosis].

Combined surface radiation of renal projection area and intravascular laser radiation of blood (AZOR-2K unit) were used in combined treatment of 54 patients with urinary tuberculosis. Analysis of immunological and hematological indices of peripheral blood of patients before and after the combined treatment showed that low-intensity laser radiation activates local system of T-helpers which after specific antigenic impact differentiate into T-helpers-1. The latter synthesize in loco gamma-interferon, TNF-alpha and beta and IL-2 stimulating bactericidal mechanisms directed at destruction of M. tuberculosis and resolution of the infection focus.

Female↗

PubMedDate not supplied

[New data on trematodes of the families Opecoelidae and Accacoeliidae from fishes in Atlantic ocean and its seas].

The additions concerning the morphological characters and measurements of Anomalotrema koiae, Helicometra fasciata, Accacladocoelium macrocotyle, A. petasiporum, and Paraccacladium jamiesoni have been made. Podocotyle atomon (Rud., 1802) in Gaevskaya, Umnova, 1977 described from Sebastes marinus from the northwest Atlantic is considered as Anomalotrema koiae. Helicometra fasciata is found in Mugilidae for the first time. Accacladocoelium macrocotyle and A. petasiporum are found in the new region--the Azores.

Animals↗

PubMedDate not supplied

[Etiopathogenetic basis for using magnetolaser therapy in the complex treatment of male infertility].

Up to 12-15% couples are infertile. The "responsibility" for infertility rests with the husband in 40-45% cases. The effects of routine drug therapy (n = 95) on a generative function are compared to those of magnetolaser therapy (n = 93) in 188 males with excretory-inflammatory infertility suffering from chronic prostatitis. Low-intensity laser infra-red radiation was used in a permanent magnetic field produced by Azor-2K unit. The magnetolaser therapy more significantly than the routine therapy raised concentration and number of mobile forms of the spermia, reduced their degenerative forms, elevated the level of serum sexual and gonadotropic hormones. In 1 year pregnancy occurred in 41.7 and 55.4% of 83 and 87 families (groups 1 and 2), respectively. The delivery took place in 35.8 and 49.7%, respectively.

Humans↗