Your browser doesn't support javascript.
loading
Mostrar: 20 | 50 | 100
Resultados 1 - 20 de 296
Filtrar
Mais filtros

Intervalo de ano de publicação
1.
Rev Chil Pediatr ; 91(4): 579-583, 2020 Aug.
Artigo em Espanhol | MEDLINE | ID: mdl-33399736

RESUMO

INTRODUCTION: Imperforated hymen is the most frequent congenital malformation of the female genital tract. Most cases are not investigated in childhood, due to an insufficient genital examination. Its diagnosis and resolution must be early and definitive to avoid subsequent complications. OBJECTIVE: A clinical case of an infant with imperforated himen is presented. To update on genital examination technique necessary to detect this pathology in the newborn and infants, and the proper treatment. CLINICAL CASE: 3-months-old infant that consulted due to an increase in bulging volume in the introitus area. In the physical examination, the Valsalva's maneuver was performed allowed the ex pulsion of a homogeneous pearly mass with a smooth surface, between the labia majora, suggesting imperforate hymen. The study was complemented with gynecological ultrasound, which demons trated the presence of hydrocolpos, ruling out other anomalies. A hymenotomy was performed, which allowed for the evacuation of abundant serous material, with no bad smell, and then the hymenectomy was completed by resection of the hymenal membrane. In follow-up monitoring 4 months after the intervention, a widely permeable hymen was found. CONCLUSION: Neonatal care teams require training on the correct technique of external genital examination of the newborn and infant. Hymenectomy is the technique that allows definitely resolving the condition, avoiding complications.


Assuntos
Anormalidades Congênitas/diagnóstico , Anormalidades Congênitas/cirurgia , Hímen/anormalidades , Feminino , Humanos , Hímen/cirurgia , Lactente , Exame Físico/métodos
2.
Opt Express ; 27(26): 37196-37213, 2019 Dec 23.
Artigo em Inglês | MEDLINE | ID: mdl-31878504

RESUMO

Some complex dissipative dynamics associated with the noise-like pulse (NLP) regime of a passively mode-locked erbium-doped fiber laser are studied numerically. By means of a convenient 3D mapping of the spatio-temporal pulse evolution, for properly chosen dispersion parameters, several puzzling dissipative dynamics of NLPs are identified, including the expelling of sub-packets that move away from the main bunch, the sudden extinction of isolated sub-pulses, the collision between different internal fragments travelling at different speeds, the rising of sub-pulses, the formation of complex trajectories by substructures that first move away and then return to the main bunch, and so on. In addition, the emergence of optical rogue waves (ORWs) within NLPs is also demonstrated numerically; to help understand these behaviors evidenced in the time domain, spectral analyzes were also performed that show, among other things, that the spectrum of a NLP is notoriously distorted when it hosts an ORW phenomenon. These numerical results are consistent with previously published experimental results.

3.
Opt Express ; 27(13): 17521-17538, 2019 Jun 24.
Artigo em Inglês | MEDLINE | ID: mdl-31252710

RESUMO

We present an experimental study of complex noise-like pulse dynamics in a passively mode-locked figure-eight fiber laser, by performing simultaneous temporal and spectral mapping of the waveform sequences. The simultaneous measurements allow us to relate temporal and spectral events. We found in particular that the evolution of energy and of temporal features such as the number and width of the wave packets is correlated to spectral variations, namely of the central wavelength and bandwidth of the instantaneous spectrum. The simultaneous temporal and spectral measurements also allowed a substantial improvement in the precision of the latter, which was performed using the dispersive Fourier transform method. In particular, this enhanced precision allowed measuring the subtle spectral differences between the two laser outputs and tracking their evolution over the cycles, providing crucial information that allowed to determine the physical phenomena involved in the observed dynamics.

4.
Rev Gastroenterol Mex ; 82(2): 129-133, 2017.
Artigo em Inglês, Espanhol | MEDLINE | ID: mdl-28318702

RESUMO

INTRODUCTION AND AIMS: Evidence in Colombia and Latin America has been insufficient for establishing the clinical characteristics of patients with antibiotic-associated diarrhea (AAD). The present study attempts to describe the clinical characteristics of patients with AAD and to determine the presence of Clostridium difficile, utilizing the polymerase chain reaction (PCR) technique. MATERIALS AND METHODS: Forty-three patients with AAD, managed at the Hospital Universitario San Ignacio in Bogotá, Colombia, were evaluated. Prospective patient information was collected, with respect to demographic characteristics, profile of the antibiotic management received, clinical manifestations, risk factors, and paraclinical reports. In addition, the real time PCR test for Clostridium difficile (Cepheid Xpert®, Sunnyvale, CA, United States) was performed. RESULTS: Patient mean age was 58 years (19.31 SD). The majority of the patients received 2 or more antibiotics (62.9%) and the beta-lactams were the most frequently used. Hospital stay ranged from 2 to 104 days with a median of 10 days. The most frequent clinical manifestations were abdominal pain and bloating, followed by fever and tachycardia. At the time of diagnosis, 23 patients had noninflammatory results in the stool sample analyses and 18 had kidney failure. The mean level of albumin was 2.4mg/dl (0.7 SD). The presence of Clostridium difficile was documented through PCR in 6 patients (13.95% of the cases). CONCLUSIONS: AAD patients were characterized by a high frequency of severe comorbidities and prolonged hospital stay. The presence of Clostridium difficile in only 13.9% of the cases suggests that other causes of diarrhea in the hospitalized patient should be considered.


Assuntos
Antibacterianos/efeitos adversos , Clostridioides difficile , Diarreia/etiologia , Diarreia/microbiologia , Adulto , Idoso , Enterocolite Pseudomembranosa/etiologia , Enterocolite Pseudomembranosa/microbiologia , Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Reação em Cadeia da Polimerase , Estudos Prospectivos
5.
Epidemiol Infect ; 143(10): 2187-204, 2015 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-25268692

RESUMO

A survey of national animal influenza surveillance programmes was conducted to assess the current capacity to detect influenza viruses with zoonotic potential in animals (i.e. those influenza viruses that can be naturally transmitted between animals and humans) at regional and global levels. Information on 587 animal influenza surveillance system components was collected for 99 countries from Chief Veterinary Officers (CVOs) (n = 94) and published literature. Less than 1% (n = 4) of these components were specifically aimed at detecting influenza viruses with pandemic potential in animals (i.e. those influenza viruses that are capable of causing epidemic spread in human populations over large geographical regions or worldwide), which would have zoonotic potential as a prerequisite. Those countries that sought to detect influenza viruses with pandemic potential searched for such viruses exclusively in domestic pigs. This work shows the global need for increasing surveillance that targets potentially zoonotic influenza viruses in relevant animal species.


Assuntos
Monitoramento Epidemiológico , Influenza Humana/virologia , Infecções por Orthomyxoviridae/veterinária , Orthomyxoviridae/isolamento & purificação , Zoonoses/virologia , Animais , Estudos Transversais , Humanos , Infecções por Orthomyxoviridae/epidemiologia , Sus scrofa
6.
Euro Surveill ; 19(18)2014 May 08.
Artigo em Inglês | MEDLINE | ID: mdl-24832117

RESUMO

Factors that trigger human infection with animal influenza virus progressing into a pandemic are poorly understood. Within a project developing an evidence-based risk assessment framework for influenza viruses in animals, we conducted a review of the literature for evidence of human infection with animal influenza viruses by diagnostic methods used. The review covering Medline, Embase, SciSearch and CabAbstracts yielded 6,955 articles, of which we retained 89; for influenza A(H5N1) and A(H7N9), the official case counts of t he World Health Organization were used. An additional 30 studies were included by scanning the reference lists. Here, we present the findings for confirmed infections with virological evidence. We found reports of 1,419 naturally infected human cases, of which 648 were associated with avian influenza virus (AIV) A(H5N1), 375 with other AIV subtypes, and 396 with swine influenza virus (SIV). Human cases naturally infected with AIV spanned haemagglutinin subtypes H5, H6, H7, H9 and H10. SIV cases were associated with endemic SIV of H1 and H3 subtype descending from North American and Eurasian SIV lineages and various reassortants thereof. Direct exposure to birds or swine was the most likely source of infection for the cases with available information on exposure.


Assuntos
Virus da Influenza A Subtipo H5N1/patogenicidade , Influenza Aviária/virologia , Influenza Humana/virologia , Zoonoses , Animais , Aves , Humanos , Influenza Aviária/transmissão , Influenza Humana/transmissão , Suínos
7.
Reprod Domest Anim ; 48(2): 258-66, 2013 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-22747962

RESUMO

The objective of this study was to evaluate the effects of a combination of 6% low-density lipoproteins (LDL) and 20 mm glutamine in comparison with other extenders used for the refrigeration of canine semen: Tris egg yolk (EY) 20% and 6% LDL. The percentages of mobile spermatozoa after 4 days storage in a domestic refrigerator at +4 °C were 53.1%, 44.2% and 52.2% for the 6% LDL + 20 mm glutamine, 20% EY and 6% LDL extenders respectively for 100% of the dogs. After 7 days of storage, these percentages fell to 37.8%, 26.4% and 33.6% in the same extenders for 50% of the dogs. In vitro fertility tests were performed with all of the extenders following the mobility results. These tests were conducted on the day of sampling (D0), and 48 and 96 h after sampling. The results of the hypo-osmotic swelling test were 82.6%, 81.2% and 85.7% on D0, 75.2%, 74.1% and 78.5% on D2, and 70.8%, 71% and 76.1% on D4 for the 6% LDL + 20 mm glutamine, 20% EY and 6% LDL extenders, respectively. For the FITC/pisum sativum agglutinin (PSA) test, the results were 81.5%, 70.2% and 84.8% on D0, 78.9%, 62.3% and 84.2% on D2, and 72.7%, 59.6% and 73.7% on D4 for the 6% LDL + 20 mm glutamine, 20% EY and 6% LDL extenders, respectively. The acridine orange test was positive; in nearly 100% of cases, none of the spermatozoa had been denatured on D0, D2 and D4. The 6% LDL + 20 mm glutamine and the 6% LDL extenders are capable of preserving spermatozoa that have been stored in a domestic refrigerator at +4°C for at least 4 days. This means that the spermatozoa retain good cytoplasmic membrane integrity, had not capacitated and contained intact DNA in comparison with spermatozoa preserved in the egg yolk extender. The duration of storage is a very important consideration when faced with the problem of sending semen over ever-greater distances.


Assuntos
Crioprotetores/farmacologia , Cães/fisiologia , Gema de Ovo/química , Glutamina/química , Preservação do Sêmen/veterinária , Espermatozoides/efeitos dos fármacos , Animais , Membrana Celular/efeitos dos fármacos , Galinhas , Crioprotetores/química , Dano ao DNA/efeitos dos fármacos , Feminino , Fertilização in vitro/veterinária , Glutamina/farmacologia , Masculino , Preservação do Sêmen/métodos , Motilidade dos Espermatozoides/efeitos dos fármacos
8.
Andes Pediatr ; 94(1): 29-36, 2023 Jan.
Artigo em Espanhol | MEDLINE | ID: mdl-37906868

RESUMO

In Chilean children and adolescents, human papillomavirus (HPV) infection prevalence is unknown. In 2014, the HPV vaccine was incorporated into the National Immunization Program for girls, and since 2019 for boys. OBJECTIVE: To determine the prevalence, genotypes, and characteristics of HPV infection in children and adolescents with anogenital lesions not vaccinated against HPV. PATIENTS AND METHOD: Children and adolescents with anogenital lesions who consulted at the Luis Calvo Mackenna Children's Hospital between 2013 and 2017 were studied. The reason for consultation, age, sex, family history of HPV lesions, history of sexual abuse, and consensual sexual activity were recorded. HPV was detected by PCR and typification by reverse hybridization of the L1 gene. The samples were analyzed in the Oncogenic Virus Section of the Institute of Public Health. RESULTS: 110 patients were studied; 44.5% were children. HPV was detected in 34 cases (30.9% [CI95% 22.4- 40.4]), 22 (44.9%) were children and 12 (19.7%) adolescents. Eleven (91.7%) adolescents had a history of sexual con tact (p < 0.005); 4 (18.2%) children disclosed sexual abuse. HPV was found in 25% of patients with genital lesions and 50% with perianal lesions (p < 0.015). The most frequent genotypes were 59, 58, 16, 18, 6, and 11. Only low-risk genotypes were detected in children and high-risk genotypes were detected in 11/12 (91.7%) of HPV (+) adolescents. CONCLUSION: The prevalence of HPV infection was 30%. In adolescents, the infection was related to sexual contact and high-risk HPV. In children, it was associated with low-risk genotypes. Perianal lesions are more frequently associated with HPV infec tion than genital lesions in children and adolescents. The visual inspection does not allow to specify the etiology of the genital lesions, so it is necessary to perform a PCR test for HPV.


Assuntos
Infecções por Papillomavirus , Vacinas contra Papillomavirus , Masculino , Feminino , Humanos , Criança , Adolescente , Infecções por Papillomavirus/epidemiologia , Infecções por Papillomavirus/prevenção & controle , Papillomavirus Humano , Estudos Transversais , Papillomaviridae/genética
9.
Environ Toxicol Pharmacol ; 90: 103813, 2022 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-35033683

RESUMO

Phthalates are endocrine disrupting compounds that have been found in outdoor and indoor air. However, little is known about their inhalatory absorption. Although measurement of urinary metabolites is the current standard, complex and convergent metabolism of phthalates poses the necessity for alternative methodologies such as the quantitation of parental compounds in plasma. We determined the inhalatory absorption of Diisobutyl phthalate (DiBP) using a novel method based on a thermal desorption probe (TSP)-gas chromatography-mass spectrometry developed for the detection and quantitation of nine phthalate diesters in blood plasma, which fulfilled the acceptance criteria suggested by FDA guidelines regarding specificity, matrix effect, recovery, linearity, sensitivity, accuracy, and precision. After inhalation, plasma concentration of DiBP exhibited two peaks, suggesting a first, rapid absorption event, followed by a second, delayed one and a first order elimination stage. Half-life was calculated as 62 min and bioavailability, compared to IV route, was 15%.


Assuntos
Dibutilftalato/análogos & derivados , Exposição por Inalação/análise , Ácidos Ftálicos/análise , Animais , Análise Química do Sangue/métodos , Dibutilftalato/toxicidade , Cromatografia Gasosa-Espectrometria de Massas , Masculino , Ratos , Ratos Wistar , Toxicocinética
10.
J Public Health (Oxf) ; 33(4): 579-86, 2011 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-21339200

RESUMO

BACKGROUND: The population in the Texas-Mexico border is rapidly increasing and exacerbating a number of public health problems and healthcare services. The needs of this area have been predominantly assessed through a professional lens. To better inform public policy and serve the area, this study assessed the needs of families living along the Texas-Mexico border. METHODS: Approximately 2000 households along the Texas-Mexico border were interviewed for their basic demographic information and health needs. RESULTS: It was found that children's healthcare services were the highest reported need among families along the border. The probability of reporting healthcare needs increased by 43% among families with children under the age of 5, whereas the probability of reporting healthcare needs decreased by 40% among families with children 13 and older. CONCLUSION: The findings from this study suggest child healthcare services, particularly for families with young children, is the most pressing need of the area.


Assuntos
Características da Família/etnologia , Saúde da Família , Necessidades e Demandas de Serviços de Saúde/estatística & dados numéricos , Americanos Mexicanos/estatística & dados numéricos , Adolescente , Adulto , Idoso , Criança , Serviços de Saúde da Criança , Pré-Escolar , Coleta de Dados , Diabetes Mellitus/terapia , Feminino , Necessidades e Demandas de Serviços de Saúde/tendências , Cardiopatias/terapia , Humanos , Modelos Logísticos , Masculino , Americanos Mexicanos/etnologia , México/etnologia , Pessoa de Meia-Idade , Optometria , Texas , Adulto Jovem
11.
Med Devices (Auckl) ; 14: 97-103, 2021.
Artigo em Inglês | MEDLINE | ID: mdl-33833594

RESUMO

BACKGROUND: High glycemic Variability (HGV) has become a stronger predictor of hypoglycemia. However, clinical factors associate with HGV still are unknown. OBJECTIVE: To determine clinical variables that were associated with a coefficient of variation (CV) above 36% evaluated by continuous glucose monitoring (CGM) in a group of patients with diabetes mellitus. METHODS: A cohort of patients with type 2 diabetes (T2D) was evaluated. Demographic variables, HbA1c, glomerular filtration rate (GFR) and treatment regimen were assessed. A bivariate analysis was performed, to evaluate the association between the outcome variable (CV> 36%) and each of the independent variables. A multivariate model was constructed to evaluate associations after controlling for confounding variables. RESULTS: CGM data from 274 patients were analyzed. CV> 36% was present in 56 patients (20.4%). In the bivariate analysis, demographic and clinical variables were included, such as time since diagnosis, hypoglycemia history, A1c, GFR and treatment established. In the multivariate analysis, GFR <45 mL/min (OR 2.81; CI 1.27,6.23; p:0.01), A1c > 9% (OR 2.81; CI 1.05,7.51; p:0.04) and hypoglycemia history (OR 2.09; CI 1.02,4.32; p:0.04) were associated with HGV. Treatment with iDPP4 (OR 0.39; CI 0.19,0.82; p:0.01) and AGLP1 (OR 0.08; CI 0.01,0.68; p:0.02) was inversely associated with GV. CONCLUSION: Clinical variables such as GFR <45 mL/min, HbA1C>9% and a history of hypoglycemia are associated with a high GV. Our data suggest that the use of technology and treatments able to reduce glycemic variability could be useful in this population to reduce the risk of hypoglycemia and to improve glycemic control.

12.
Food Sci Technol Int ; 16(5): 443-50, 2010 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-21339163

RESUMO

The dietary intake of total arsenic (tAs), inorganic arsenic (iAs) and total mercury (tHg) in lunch and breakfast servings provided by the Chilean School Meal Program (SMP) was estimated, using the duplicate-portion variant of the total diet study. Lunch and breakfast samples were collected from 65 schools throughout the country in 2006. The population sample was a group of girls and boys between 6 and 18 years old. The tAs concentration was measured via hydride-generation atomic absorption spectrometry. The total mercury concentration was measured via cold-vapor atomic absorption spectroscopy. The estimated iAs intake was 12.5% (5.4 µg/day) of the Provisional tolerable daily intake (PTDI) as proposed by the FAO/WHO, and the tHg intake was 13.2% (1.9 µg/day) of the PTDI as proposed by the FAO/WHO. It was therefore concluded that tAs, iAs and tHg intake from food provided by the SMP do not pose risks to student health.


Assuntos
Arsênio/administração & dosagem , Arsênio/química , Contaminação de Alimentos/análise , Mercúrio/administração & dosagem , Mercúrio/química , Adolescente , Criança , Chile , Exposição Ambiental , Poluentes Ambientais , Feminino , Análise de Alimentos , Humanos , Masculino , Instituições Acadêmicas
13.
Sci Total Environ ; 703: 134526, 2020 Feb 10.
Artigo em Inglês | MEDLINE | ID: mdl-31767312

RESUMO

Air pollution is a public health concern. Polycyclic aromatic hydrocarbons (PAH) are ubiquitous atmospheric pollutants contained in the atmospheric aerosol. PAH in particulate matter with diameters ≤2.5 µm (PM2.5) represent a human health risk due to their toxic properties. In this study, PAH in PM2.5 at a receptor site of Mexico City during the dry cold season were determined. The most abundant PAH (median, 10-90th percentile, pg m-3) were benzo[ghi]perylene (467, 291-697), followed by pyrene (427, 218-642). A decrease around 40% in the carcinogenic PAH onto PM2.5 was calculated with respect to the same PAH measured a decade ago, at the same receptor site, despite of increase in vehicle fleet. The PAH decrease trend agrees with the decrease trend of CO, NO and NO2, released into the air by similar emission sources than PAH. Control emissions strategies implemented by local and federal authorities are discussed. PAH analyses were carried out by non-real-time and real-time methods. The PAH non-real-time method involved PM2.5 sampling, sample treatment and gas chromatography-mass spectrometry analysis. The PAH real-time method involved the use of a photoelectric aerosol sensor (PAS). The PAH determination by non-real time method was selective and efficient, with recoveries between 75 ±â€¯14% and 98 ±â€¯26%. By combining non-real-time and real-time methodologies, multivariate regression models were obtained based on PAS response, NO2 and wind speed to estimate PAH in PM2.5 at low-cost (r2 = 0.59 to r2 = 0.89). Fossil fuel combustion from vehicles was the major source around the sampling site. Diagnostic ratios (DR) based on retene, chrysene, and triphenylene, suggested biomass burning emission sources. Photo-oxidation in sunny months was observed based on benzo[a]pyrene, benzo[ghi]perylene, benz[a]anthracene, indeno[1,2,3-cd]pyrene and black carbon. The correlation analyses suggested transport of PM2.5, O3, BC and SO2 to the sampling site, and local emissions of PAH, NO and CO.

14.
Environ Pollut ; 267: 115637, 2020 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-33254712

RESUMO

The presence of organochlorine pesticides (OCPs) and polybrominated diphenyl ethers (PBDEs) was analysed in air particulate matter ≤ 2.5 µm (PM2.5) and ≤10 µm (PM10) collected in the Metropolitan Zone of Mexico Valley (MZMV), during 2013 and 2014, respectively. Spatial and seasonal distributions of PM and their organic content named solvent extracted organic matter (SEOM) were determined. PM mass concentration and SEOM/PM ratios were compared with previous studies in 2006 in Mexico City. PM2.5 concentration was like found in 2006, however, PM10 decreased ∼43%. The SEOM/PM10 ratio was kept constant, suggesting a decrease in SEOM as well as PM10 emitted from natural sources, probably as a result of changes in the land use due to urban growth. A decrease ∼50% SEOM/PM2.5 ratio was observed in the same period, linked to adequate strategies and public policies applied by the local and federal governments to control the organic matter emitted from anthropogenic sources. Seven out of sixteen OCPs and five out of six PBDEs were found. The most common POPs were endosulfan I, endosulfan II, endosulfan sulfate, BDE-47 and BDE-99, present on >90% of the sampling days. OCPs in PM2.5 and PBDEs in PM10 showed seasonal variability. Higher PBDEs concentration in both particle sizes were observed at east and southeast of the MZMV, where one of the biggest landfills and wastewater treatment plants are located. OCPs in PM10 were mainly emitted from agricultural areas located to the southwest, southeast and east of the MZMV. OCPs in PM2.5 showed a regional contribution from the north and introduced into the valley. OCP degradation products were dominant over native OCPs, indicating no fresh OCP use. POPs comparison with other cities was made. Agreements and commissions created by the Mexican government reduced OCPs emissions, however, more effort must be made to control PBDE emission sources.


Assuntos
Poluentes Atmosféricos , Praguicidas , Cidades , Monitoramento Ambiental , Éteres Difenil Halogenados , México , Material Particulado , Política Pública
16.
Theriogenology ; 71(6): 895-900, 2009 Apr 01.
Artigo em Inglês | MEDLINE | ID: mdl-19117604

RESUMO

Artificial insemination with doses containing low-sperm numbers has been utilized to optimize the use of elite bulls. Hen egg yolk is widely used as a cryoprotective agent in semen freezing extender protecting the spermatozoa. Its action is due to the presence of low-density lipoproteins (LDL) in the hen egg yolk. The objectives of the present study were to evaluate the effects of the semen dilution to low-sperm number/dose on sperm motility and integrity of sperm plasma membrane in the cryopreservation process, using two commercial extenders (Triladyl, Bioxcell and LDL extender prepared in our laboratory, 97% purity. Fifteen ejaculates were collected from five fertile crossbred bulls (Bos taurusxBos indicus). After collection, sperm motility was examined by Computer-Assisted Semen Analysis (Hamilton Thorne), morphological sperm characteristics were evaluated by differential interference microscopy and the integrity of plasma membranes was determined using the hypo-osmotic swelling test. The semen was subsequently divided into three aliquots and diluted with the three extenders into 120 x 10(6), 60 x 10(6) and 20 x 10(6)sperm/mL, corresponding to 30 x 10(6), 15 x 10(6) and 5 x10(6) sperm/dose, respectively. This study revealed that LDL extender was more effective in preservation of motility and integrity of the plasma membrane of spermatozoa than Bioxcell and Triladyl (p<0.05), but no significant difference was observed between Triladyland Bioxcell. Therefore we can conclude that LDL extender could be used instead of Triladyl or Bioxcellat low semen concentration per dose for elite bulls, it also could be envisaged for the industry of sex-stored semen.


Assuntos
Bovinos , Criopreservação/veterinária , Lipoproteínas LDL , Extratos Vegetais , Preservação do Sêmen/veterinária , Contagem de Espermatozoides/veterinária , Espermatozoides/fisiologia , Animais , Membrana Celular/fisiologia , Crioprotetores , Soluções Hipertônicas , Soluções Isotônicas , Lecitinas , Masculino , Sêmen/citologia , Preservação do Sêmen/métodos , Soluções , Proteínas de Soja , Espermatozoides/ultraestrutura
17.
Theriogenology ; 71(8): 1209-14, 2009 May.
Artigo em Inglês | MEDLINE | ID: mdl-19282024

RESUMO

Glutamine has been used in the composition of semen extenders in several species, but never in the bull. The aim of our study is to demonstrate the cryoprotective role of glutamine for freezing bovine semen and to determine concentration of the latter to improve the motility and trajectory characteristics of spermatozoa. Three experiments were undertaken with 21 ejaculates from three different bulls. In the first experiment, glutamine was added to 40, 80, and 120 mM of basic medium (BM) which consisted of Tris+glycerol 6.4% (v/v). In the second experiment glutamine was added to the 8% low density lipoprotein (LDL) diluent at 40, 80, and 120 mM. In the third experiment, the best concentration of glutamine was determined; this was then added to the LDL extender at 10, 20, 30, and 40 mM. The semen was diluted then frozen in the different media. Motility parameters were assessed using an image analyser following thawing. Experiment 1 demonstrated that glutamine had a cryoprotective effect; at 40 mM it gave superior motility parameters to those obtained with the basic medium (p<0.05). Experiment 2 demonstrated that the combination of LDL-glutamine 40 mM and 80 mM did not improve motility and even deteriorated it in comparison with the glutamine-free LDL extender. Experiment 3 demonstrated that the addition of 10mM of glutamine to the LDL medium lead to a significant improvement (p<0.05) in the motility of bull spermatozoa and could be used to improve bovine semen extenders.


Assuntos
Glutamina/farmacologia , Lipoproteínas LDL/farmacologia , Motilidade dos Espermatozoides/efeitos dos fármacos , Espermatozoides/efeitos dos fármacos , Animais , Bovinos , Criopreservação/métodos , Crioprotetores/farmacologia , Combinação de Medicamentos , Congelamento , Glicerol/farmacologia , Masculino , Pressão Osmótica/efeitos dos fármacos , Pressão Osmótica/fisiologia , Projetos Piloto , Preservação do Sêmen/métodos , Espermatozoides/fisiologia
18.
Bull Environ Contam Toxicol ; 82(1): 101-5, 2009 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-18841320

RESUMO

Total mercury levels (Thg) were quantified in Clarias gariepinus captured from the Sagua la Grande River (Cuba) in the vicinity of an active chlor-alkali plant, and relationships among place of capture; fish size, weight, and sex; and THg levels were assessed. THg levels ranged from 67 to 375 ng/g ww in collected fish, never exceeding the Cuban recommended maximum limit for fish consumption of 500 ng/g ww. No significant correlation was observed between mercury levels and fish allometric characteristics (p < 0.05); however, levels were significantly higher in fish captured below the chlor-alkali facility, suggesting a connection between mercury bioaccumulation and plant discharges.


Assuntos
Peixes-Gato/metabolismo , Mercúrio/análise , Rios/química , Poluentes Químicos da Água/análise , Animais , Tamanho Corporal , Peso Corporal , Cuba , Feminino , Geografia , Masculino , Mercúrio/farmacocinética , Mercúrio/toxicidade , Medição de Risco , Caracteres Sexuais , Poluentes Químicos da Água/farmacocinética , Poluentes Químicos da Água/toxicidade
19.
Bull Environ Contam Toxicol ; 83(6): 869-73, 2009 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-19551328

RESUMO

Breast milk is considered the most important route in the elimination of deposited organochlorine pesticides in a mother's body. The equilibrium of organochlorine pesticides in the human body considers the elements of internal transport processes, the equilibrium pattern between pesticides and tissue fat contents, and the mobilization of lipids and lipoproteins among body parts. The aim of this study was to determine organochlorine pesticide levels in breast milk samples from the 4th to the 30th day of lactation and the trend in their concentration time so as to forecast the time tendency of residue levels and the pesticide excretion pattern. Milk samples were taken from forty participants and analyzed by GLC-ECD. The organochlorine pesticide residues determined in the breast milk samples during lactation decreased: ß-HCH from 0.095 to 0.066 mg/kg, pp'DDE from 1.807 to 1.423 mg/kg and pp'DDT from 0.528 to 0.405 mg/kg, at the characteristic rate for each compound. The obtained results compared with the calculated fits of forecasts were parallel and did not exhibit significant differences. The newborn baby exposed during lactation had organochlorine pesticide residues whose levels decreased permanently. The levels depended not only on the breast milk nutrition, but also on the total environmental exposures which included air pollution as a significant contamination source.


Assuntos
DDT/metabolismo , Diclorodifenil Dicloroetileno/metabolismo , Poluentes Ambientais/metabolismo , Hexaclorocicloexano/metabolismo , Leite Humano/metabolismo , Praguicidas/metabolismo , Monitoramento Ambiental , Feminino , Humanos , Exposição Materna/estatística & dados numéricos
20.
Food Funct ; 9(4): 2426-2432, 2018 Apr 25.
Artigo em Inglês | MEDLINE | ID: mdl-29629722

RESUMO

Secoisolariciresinol (SECO) is present in flaxseeds as a glucoside, secoisolariciresinol diglucoside (SDG), which can be metabolized to enterodiol (ED) and enterolactone (EL) by the human intestinal microbiota. The aim of this study was to evaluate the effect of Lactobacillus casei and Lactobacillus acidophilus on the bioaccessibility of flaxseed lignans from a complete in vitro digestion of whole flaxseeds (WFs) and flaxseed flour (FF). Lignans are only detected in the large intestine. The bioaccessibility of SDG for FF digestion can be ordered as follows: control (without probiotics) > L. casei > L. acidophilus; and for WF digestion, only in the presence of L. casei SDG was detected. For SECO and EL, the presence of both probiotics had no effect on FF and WF digestion. However, in the digestion of WF both L. casei and L. acidophilus increased ED bioaccessibility in the first 12 h; but both probiotics had no significant effect on FF digestion.


Assuntos
Linho/microbiologia , Lacticaseibacillus casei/metabolismo , Lactobacillus acidophilus/metabolismo , Lignanas/metabolismo , Extratos Vegetais/metabolismo , Digestão , Linho/química , Linho/metabolismo , Humanos , Intestino Grosso/metabolismo , Intestino Grosso/microbiologia , Lignanas/química , Extratos Vegetais/química , Sementes/química , Sementes/metabolismo , Sementes/microbiologia
SELEÇÃO DE REFERÊNCIAS
Detalhe da pesquisa