Penalized likelihood and multi-objective spatial scans for the detection and inference of irregular clusters

Background: Irregularly shaped spatial clusters are difficult to delineate. A cluster found by an algorithm often spreads through large portions of the map, impacting its geographical meaning. Penalized likelihood methods for Kulldorff's spatial scan statistics have been used to control the excessive freedom of the shape of clusters. Penalty functions based on cluster geometry and non-connectivity have been proposed recently. Another approach involves the use of a multi-objective algorithm to maximize two objectives: the spatial scan statistics and the geometric penalty function. Results & Discussion: We present a novel scan statistic algorithm employing a function based on the graph topology to penalize the presence of under-populated disconnection nodes in candidate clusters, the disconnection nodes cohesion function. A disconnection node is defined as a region within a cluster, such that its removal disconnects the cluster. By applying this function, the most geographically meaningful clusters are sifted through the immense set of possible irregularly shaped candidate cluster solutions. To evaluate the statistical significance of solutions for multi-objective scans, a statistical approach based on the concept of attainment function is used. In this paper we compared different penalized likelihoods employing the geometric and non-connectivity regularity functions and the novel disconnection nodes cohesion function. We also build multi-objective scans using those three functions and compare them with the previous penalized likelihood scans. An application is presented using comprehensive state-wide data for Chagas' disease in puerperal women in Minas Gerais state, Brazil. Conclusions: We show that, compared to the other single-objective algorithms, multi-objective scans present better performance, regarding power, sensitivity and positive predicted value. The multi-objective non-connectivity scan is faster and better suited for the detection of moderately irregularly shaped clusters. The multi-objective cohesion scan is most effective for the detection of highly irregularly shaped clusters

Nicotinic acid induces antinociceptive and anti-inflammatory effects in different experimental models

AbstractAlthough in vitro studies have shown that nicotinic acid inhibits some aspects of the inflammatory response, a reduced number of in vivo studies have investigated this activity. To the best of our knowledge, the effects induced by nicotinic acid in models of nociceptive and inflammatory pain are not known. Per os (p.o.) administration of nicotinic acid (250, 500 or 1000mg/kg, −1h) inhibited the first and the second phases of the nociceptive response induced by formalin in mice. Nicotinic acid (250 or 500mg/kg, −1 and 3h) also inhibited the mechanical allodynia induced by carrageenan in rats, a model of inflammatory pain. However, in a model of nociceptive pain, exposure of mice to a hot-plate, nicotinic acid was devoid of activity. In addition to inhibiting the nociceptive response in models of inflammatory pain, nicotinic acid (250 or 500mg/kg, p.o., −1 and 3h) inhibited paw edema induced by carrageenan in mice and rats. Picolinic acid (62.5 or 125mg/kg, p.o., −1h), a nicotinic acid isomer, inhibited both phases of the nociceptive response induced by formalin, but not paw edema induced by carrageenan in mice. The other nicotinic acid isomer, isonicotinic acid, was devoid of activity in these two models. In conclusion, our results represent the first demonstration of the activity of nicotinic acid in experimental models of nociceptive and inflammatory pain and also provide further support to its anti-inflammatory activity. It is unlikely that conversion to nicotinamide represents an important mechanism to explain the antinociceptive and anti-inflammatory activities of nicotinic acid. The demonstration of new activities of nicotinic acid, a drug that has already been approved for clinical use and presents a positive safety record, may contribute to raise the interest in conducting clinical trials to investigate its usefulness in the treatment of painful and inflammatory diseases

Tolerância de cultivares de algodão (Gossypium hirsutum) à salinidade da água de irrigação

A cultura do algodoeiro, apesar de tolerante à salinidade, pode sofrer reduções substanciais no crescimento e produção, quando submetida a elevado estresse salino. Deste modo, objetivou-se avaliar a tolerância de cultivares de algodão à salinidade da água de irrigação em diferentes salinidades da água de irrigação. O estudo foi realizado em ambiente protegido na Universidade Federal Rural do Semi-Árido, situado no município de Mossoró, RN. O delineamento experimental utilizado foi inteiramente ao acaso, com 12 tratamentos, correspondente a duas cultivares de algodão (BRS Verde e BRS Topázio) e 6 níveis de salinidade da água de irrigação (CEa) ;0,5; 1,5; 3,0; 4,5; 6,0; 7,5 dS m-1) em 5 repetições. As variáveis tomadas foram: altura da planta, tamanho da raiz, diâmetro do caule, número de folhas, área foliar e número de botões florais aos 45 dias após o semeio; e aos 116 dias após o semeio, foi avaliada a massa fresca das folhas, massa seca das folhas, massa seca da raiz, massa seca do caule, peso do capulho com caroço, peso do capulho, peso da semente e massa seca dos botões florais. As cultivares de algodão BRS Verde e BRS Topázio mostraram-se tolerantes à salinidade da água de irrigação, não havendo variação entre elas

A single bout of exercise with a flexible pole induces significant cardiac autonomic responses in healthy men

OBJECTIVES: Flexible poles can provide rapid eccentric and concentric muscle contractions. Muscle vibration is associated with a "tonic vibration reflex” that is stimulated by a sequence of rapid muscle stretching, activation of the muscle spindles and stimulation of a response that is similar to the myotatic reflex. Literature studies analyzing the acute cardiovascular responses to different exercises performed with this instrument are lacking. We investigated the acute effects of exercise with flexible poles on the heart period in healthy men. METHOD: The study was performed on ten young adult males between 18 and 25 years old. We evaluated the heart rate variability in the time and frequency domains. The subjects remained at rest for 10 min. After the rest period, the volunteers performed the exercises with the flexible poles. Immediately after the exercise protocol, the volunteers remained seated at rest for 30 min and their heart rate variability was analyzed. RESULTS: The pNN50 was reduced at 5-10 and 15-20 min after exercise compared to 25-30 min after exercise (p = 0.0019), the SDNN was increased at 25-30 min after exercise compared to at rest and 0-10 min after exercise (p = 0.0073) and the RMSSD was increased at 25-30 min after exercise compared to 5-15 min after exercise (p = 0.0043). The LF in absolute units was increased at 25-30 min after exercise compared to 5-20 min after exercise (p = 0.0184). CONCLUSION: A single bout of exercise with a flexible pole reduced the heart rate variability and parasympathetic recovery was observed approximately 30 min after exercise

Sudden spleen rupture in a Plasmodium vivax-infected patient undergoing malaria treatment

BACKGROUND: Splenomegaly is one of the most common features of malaria. However, spontaneous splenic rupture, although unusual, represents a severe complication often leading to death. It is mostly seen in acute infection and primary attack, and it is most commonly associated with Plasmodium vivax. Here, a case of spontaneous splenic rupture diagnosed with a portable ultrasound apparatus shortly after starting treatment and with recurrent parasitaemia after splenectomy, is reported. CASE DESCRIPTION: In November 2015, a 45-year-old Brazilian man presented to the hospital in Manaus with fever, headache and myalgia. He was diagnosed with P. vivax malaria and, after a normal G6PD test, he started treatment with chloroquine and primaquine and was discharged. Two days later, he went back to the hospital with abdominal pain, dyspnea, dry cough, pallor, oliguria and fever. Using a portable ultrasound, he was diagnosed of rupture of the spleen, which was removed by emergency surgery. After this episode, he suffered two more malaria episodes with high parasitaemia at approximately 2-month intervals. DNA from different portions of the spleen was extracted and a qualitative PCR was performed to detect P. vivax. CONCLUSIONS: The splenic rupture suffered by this patient occurred 2 days after starting the treatment. Having a portable ultrasound apparatus may have saved the patient's life, as it revealed a haemorrhage needing an urgent surgery. Parasites were detected by PCR in the extracted spleen. This patient suffered two more vivax malaria diagnosed episodes in spite of receiving and completing treatment with chloroquine and primaquine for each clinical attack. Splenic rupture during acute malaria is uncommon, but it is likely underdiagnosed and underreported, because the lack of means and equipment hinders diagnostic confirmation, especially in endemic areas

A single bout of exercise with a flexible pole induces significant cardiac autonomic responses in healthy men

OBJECTIVES: Flexible poles can provide rapid eccentric and concentric muscle contractions. Muscle vibration is associated with a "tonic vibration reflex” that is stimulated by a sequence of rapid muscle stretching, activation of the muscle spindles and stimulation of a response that is similar to the myotatic reflex. Literature studies analyzing the acute cardiovascular responses to different exercises performed with this instrument are lacking. We investigated the acute effects of exercise with flexible poles on the heart period in healthy men. METHOD: The study was performed on ten young adult males between 18 and 25 years old. We evaluated the heart rate variability in the time and frequency domains. The subjects remained at rest for 10 min. After the rest period, the volunteers performed the exercises with the flexible poles. Immediately after the exercise protocol, the volunteers remained seated at rest for 30 min and their heart rate variability was analyzed. RESULTS: The pNN50 was reduced at 5-10 and 15-20 min after exercise compared to 25-30 min after exercise (p = 0.0019), the SDNN was increased at 25-30 min after exercise compared to at rest and 0-10 min after exercise (p = 0.0073) and the RMSSD was increased at 25-30 min after exercise compared to 5-15 min after exercise (p = 0.0043). The LF in absolute units was increased at 25-30 min after exercise compared to 5-20 min after exercise (p = 0.0184). CONCLUSION: A single bout of exercise with a flexible pole reduced the heart rate variability and parasympathetic recovery was observed approximately 30 min after exercise

Influência dos sistemas agrícolas irrigados por aspersão sobre a qualidade dos recursos hídricos.

A relação entre a alteração da qualidade de água dos recursos hídricos e a evolução da área ocupada por agricultura irrigada por pivô central foi investigada no município de Guaíra-SP que constitui-se em uma das regiões de maior concentração deste tipo de agricultura na America Latina. Dados de consumo do floculante sulfato de alumínio usado na Estacão de Tratamento de Água mostram uma estreita relação entre o incremento no consumo e o aumento de 0,0 a 96,0% da área ocupada por pivô central que ocorreu entre 1983-90. Nos últimos anos a adoção do sistema de plantio direto parece estar refletindo em uma estabilização ou mesmo em uma diminuição dos gastos com sulfato de alumínio, sugerindo menor impacto sobre os recursos hídricos da região. Para o uso em irrigação a qualidade da água não apresenta restrição, exceto para alguns locais em determinados períodos do ano em que pode ocorrer restrição moderada em função dos teores de ferro total dissolvido e da condutividade elétrica

Paracoccidioidomicose enzoótica em tatus (Dasypus novemcinctus) no estado do Pará

Paracoccidioides brasiliensis foi encontrado, por inoculação de triturado de fígado e baço em hamsters, em 4 de 20 tatus (Dasypus novemcinctus) examinados na região de Tucuruí, Pará. Hamsters inoculados por via intradérmica e peritoneal com o parasito desenvolveram infecções generalizadas e morreram em 1½ a 13 meses. A diagnose do fungo foi confirmada por histopatologia e cultura. Não se observaram sinais macroscópios de doenças nos tatus. A distribuição geográfica de D. novemcinctus abrange a área endêmica de paracoccidioidomicose humana, sugerindo-se que o tatu tenha algum papel na ecologia do fungo.In spite of an extensive literature on paracoccidioidomycosis, hardly anything is known about the ecology of Paracoccidioides brasiliensis in nature. During 1983, 152 wild animals of 21 species "were examined in a survey designed to detect sylvatic hosts of Leishmania near Tucuruí, a region of tropical rainforest with acid soils, in the State of Pará, northern Brazil. Hamsters inoculated with saline suspensions of liver and spleen from 4 out of 20 Dasypus novemcinctus developed generalized systemic infections after 4 to 13 months, with abundant spherical parasitic structures up to 30 mm indiameter, visible in unstained tissue smears. Inoculation of this material into fresh hamsters, produced lethal infections in within 1½ to 5 months, with gross pathological changes in the viscera and abundant parasites characteristic of P. brasiliensis in stained histological sections. Material from infected tissue grew slowly in Sabouraud Dextrose Agar, forming light-coloured cerebriform colonies approximately 1,5 cm in diameter after 2 months at 22-26ºC. Culture material was inoculated intradermally, intraperitoneally and intratesticularly into hamsters, laboratory mice and guinea pigs. Generalized infections were detected after approximately 5 months in female hamsters that had been inoculated intradermally. The fungus was re-isolated in culture from the infected hamsters. Parasites were detected in histological sections of the liver and spleen of the original armadillos, but no gross signs of disease. were noted in these animals. D. novemcinctus is widely distributed in the Neotropical Region but is absent from certain regions, such as Chile and Patagonia, where paracoccidioidomycosis is unknown. The fossorial habits of this armadillo may be relevant in the light of previous suggestions that the saprophytic phase of P. brasiliensis inhabits a subterranean environment. It is suggested that D. novemcinctus may play a part in the ecology of P. brasiliensis in nature

Antimicrobial resistance of isolated Streptococcus pneumoniae in a hospital of the Brazilian public system

Streptococcus pneumoniae is the predominant bacterial agent that affects the human population with pneumonia. This disease is an important cause of death in the elderly and the children under five years old. in this study, 29 strains of invasive S. pneumoniae were isolated from 29 patients of pneumonia, bacteremia and meningitis in the laboratory of the Municipal Hospital in Paulinia, Brazil, from May 2006 to October 2007. Patients' age ranged from 8 months old to 60 years old. These strains of S. pneumoniae were isolated from blood, pleural fluid and cerebrospinal fluid (CSF) of patients. After typing of encapsulated strains of S. pneumoniae through quellung reaction, their resistance to antimicrobial agents was gauged through Disc Diffusion Technique followed by determination of minimum inhibitory concentration (MIC). Among the 29 strains analyzed, 23 were methicillin-sensitive and six were methicillin-resistant and penicillin intermediate resistant. No strain presented full resistance to penicillin. Serotyping was performed only in two samples, which belonged to serotype 18. Our data may alert ambulatory regarding the incidence of pneumococcal strains resistant to the most common drugs due to inappropriate use of antimicrobials and also collaborate to the elaboration of pneumococcal conjugate vaccines specific to each region.NEPASHosp Municipal Paulinia, Setor Microbiol, Paulinia, SP, BrazilUniversidade Federal de São Paulo, Dept Farm Bioquim, Diadema, SP, BrazilFac Med ABC, Dept Morfol Fisiol, Lab Escrita Cientif, Santo Andre, BrazilUniv Estadual Paulista, Fac Filosofia & Ciencias, Dept Fonoaudiol, Marilia, SP, BrazilUniversidade Federal de São Paulo, Dept Farm Bioquim, Diadema, SP, BrazilWeb of Scienc

Diet of juveniles of the venomous frog Aparasphenodon brunoi (Amphibia: Hylidae) in southeastern Brazil

Seventy juvenile individuals of Aparasphenodon brunoi were collected on the low parts of tree trunks in an Atlantic Forest remnant. Arthropods were the dominant prey found in their stomachs. Coleoptera (adult and larvae) was the most important prey regarding prey frequency, number, weight, and index of relative importance. Secondary preys included Hymenoptera that was important regarding number of prey and Hemiptera that was important regarding prey weight. Trophic ontogeny was detected. The diversity of prey suggests A. brunoi is an opportunistic sit-and-wait predator