bluuebunny/crossref_metadata_2025_split huggingface dataset:
Biological control of aphids and coccids: a comparative analysis
Authors: Hirose Yoshimi 
Published: August 2006

AbstractA comparison of the biological control of aphids and coccids was carried out by analyzing success rates for the three major types of biological control, i.e., classical, augmentative, and conservational. Because of the higher intrinsic rates of increase for aphids versus coccids, the working hypothesis that biological control of aphids is less successful compared to coccids was adopted. However, this hypothesis was not supported by an analysis of classical biological control using the BIOCAT database. In this analysis, parasitoids were more successful than predators when used against either aphids or coccids, but the control of Icerya spp. with Rodolia spp. (predators) was highly successful. Some reasons for success of Rodolia spp. are adduced, but field studies on the long‐term population dynamics of Icerya–Rodolia systems are needed for determining the mechanisms of regulation. Comparative analyses of augmentative and conservational biological control of aphids and coccids were inconclusive, due to lack of adequate databases; some possible factors involved in the success of these types of biological control are discussed. It is suggested that parasitoids could be better control agents than predators in augmentative biological control of aphids in production greenhouses. Conservational biological control of either aphids or coccids should be aimed at enhancing populations of indigenous natural enemies, especially mobile generalist predators that are capable of keeping pace with mobile pests.
Intraguild predation: fiction or reality?
Authors: Kindlmann Pavel , Houdková Kateřina 
Published: August 2006

AbstractIntraguild predation has become a major research topic in biological control. Quantification of multipredator interactions and an understanding of the consequences on target prey populations are needed, which only highlights the importance of population dynamics models in this field. However, intraguild predation models are usually based on Lotka–Volterra equations, which have been shown not to be adequate for modeling population dynamics of aphidophagous insects and their prey. Here we use a simple model developed for simulation of population dynamics of aphidophagous insects, which is based on the type of egg distribution made by predatory females, to estimate the real strength of intraguild predation in the aphidophagous insects. The model consists of two components: random egg distribution among aphid colonies, and between‐season population dynamics of the predatory species. The model is used to estimate the proportion of predatory individuals that face a conflict with a heterospecific competitor at least once during their life. Based on this, predictions are made on the population dynamics of both predatory species. The predictions are confronted with our data on intraguild predation in ladybirds.
Scaling up population dynamic processes in a ladybird–aphid system
Authors: Houdková Kateřina , Kindlmann Pavel 
Published: August 2006

AbstractHere, we study how scaling up to the metapopulation level affects predictions of a population dynamics model motivated by an aphidophagous predator–aphid system. The model incorporates optimization of egg distribution in predatory females, cannibalism among their offspring, and self‐regulation of the prey population. These factors determine the within‐year dynamics of the system and translate the numbers of prey and predator individuals at the beginning of the season into their numbers at the end of the season at the level of one patch—one suitable host plant or a group of these. At the end of each season, all populations of prey and all populations of predators are mixed (this simulates aphid host‐alternation and ladybird migration to hibernation sites), and then redistributed at the beginning of the next season. Prey individuals are distributed at random among the patches as a “prey rain”, while adult predators that survived from the previous season optimize the distribution of their offspring, in that they prefer patches with sufficient amount of prey and absence of other predators. This redistribution followed by within‐season dynamics is then iterated over many seasons. We look at whether small‐scale trends in population dynamics predicted by this model are consistent with large‐scale outcomes. Specifically, we show that even on the metapopulation scale, the impact of predators on prey metapopulation is relatively low. We further show how the dates of predator arrival to and departure from the system affect the qualitative behaviour of the model predictions.
Ecological considerations for biological control of aphids in protected culture
Authors: Yano Eizi 
Published: August 2006

AbstractSeveral braconid and aphelinid parasitoids, midges, lacewings, and ladybird beetles are used to control aphids in greenhouses. Here, I review three topics as ecological bases for the biological control of aphids in a protected culture: the preliminary evaluation of biological control agents, natural enemy release strategies, and the effects of intraguild predation (IGP) on biological control. A comparison of several parasitoid species was conducted to select agents for the biological control of aphids; the intrinsic rate of natural increase was a useful criterion in the preliminary evaluation. To compare predators as biological control agents, the aphid‐killing rate must be considered as a critical criterion, rather than reproductive criteria. The banker plant system (open rearing system) is used as a release method for Aphidius colemani and other natural enemies of aphids. Continuous release of parasitoid adults, which is the important characteristic of this method, has a stabilizing effect on population fluctuation in the aphid–parasitoid system. Two species of natural enemies can be used to control aphids in greenhouses. When one parasitoid and one predator are used simultaneously in a greenhouse, IGP of the parasitoid by the predator can occur, but the effect of IGP is less important in greenhouses than in the field.
Five‐year study of the genetic structure and demography of two subpopulations of the Japanese squirrel (Sciurus lis) in a continuous forest and an isolated woodlot
Authors: Tamura Noriko , Hayashi Fumio 
Published: August 2006

AbstractThe Japanese squirrel (Sciurus lis) is endemic to Honshu and Shikoku, Japan. In suburban environments this squirrel has tended to disappear from smaller and/or more isolated woodlots. In this study, genetic structure was compared from 1999 to 2004 for two subpopulations, one in a continuous mountain forest of western Tokyo and the other in a neighbouring woodlot isolated by a busy road. By sequencing 434 bp of the mitochondrial DNA control region of all 69 squirrels living in the two habitats, nine haplotypes were detected. Both the number of haplotypes and their genetic diversity were lower in the isolated woodlot (5 and 0.62, respectively) than in the continuous forest (8 and 0.79). Yearly comparisons revealed that only two to three haplotypes occurred simultaneously in the isolated woodlot whereas four to six were always found in the continuous forest, although the number of resident squirrels per year did not differ between the two sites. Haplotype dynamics revealed that the female population in the isolated woodlot was in a monotypic state for over two years before immigration of females with different haplotypes occurred. In the isolated woodlot immigration was thus restricted and turnover was lower, particularly among females. Such demographic factors seem to maintain the lower genetic diversity of the isolated subpopulation.
Relationship between bacterial and primary production in a newly filled reservoir: temporal variability over 2 consecutive years
Authors: Jugnia Louis‐B. , Sime‐Ngando T. , Devaux J. 
Published: August 2006

AbstractSeasonal and spatial variations in bacterial abundance, biomass and production in a recently flooded reservoir were followed for 2 consecutive years, in conjunction with phytoplankton biomass (chlorophyll a) and activity (primary production). Between the 2 years of the study, the mean value of primary production remained constant, while those of the chlorophyll a concentration, bacterial abundance (BA), bacterial biomass (BB) and bacterial production (BP) decreased. The observed trends of the bacterial variables were linked to changes in the relative importance of allochthonous dissolved organic matter. Moreover, this factor would explain discrepancies observed between the slope of the model II regression equations established from results of the present study and those of the predictive models from the literature, relating to bacterial and phytoplankton variables. An estimate of the carbon budget indicated that 22 and 5% of the ambient primary production in the Sep Reservoir might be channeled through the microbial loop via BP during the 1st and 2nd year of the study, respectively. We conclude that heterotrophic BP in the Sep Reservoir may, on occasion, represent a significant source of carbon for higher order consumers.
Evaluation of myocardial alterations using the enzymatic profile of elderly long-distance runners
Authors: Souza C. A. , Garcez-Leme L. E. 
Published: August 2006

Abstract
Elderly population often is encouraged to practice sports in preventing cardiovascular diseases. However, evidences exist that intense physical efforts are related with a higher risk for acute myocardial infarction and sudden death. Biological markers for myocardial injury was analyzed in a group of 15 elderly athletes without a history of coronary artery disease, who participated in the 77th International Sao Silvestre race (15,000 m) in Sao Paulo City. A statistical difference was observed between total CPK activity levels before the run, immediately after the run, and some time later. Similar results were observed in the concentration of CK-MB mass. The cardiac troponin I (TnI-c) levels remained unchanged and within normal limits during the same time periods. The results of the present study showed no evidence of myocardial injury in elderly subjects without a history of coronary artery disease after participating in long-distance runs, as confirmed by the analysis of TnI-c levels. The increase in total CPK activity levels and the concentration of CK-MB mass do not represent myocardial injury in these subjects.
Diabetes, aging and physical activity
Authors: Frier Bruce , Yang Pearl , Taylor Albert W. 
Published: August 2006

AbstractDiabetes mellitus (DM) is a metabolic disease affecting the regulation of insulin and glucose causing a disruption in the normal control of counterregulatory hormones and macronutrients, resulting in blood glucose accumulation. Metabolic deregulation leads to the production of noxious substances that have a particular propensity for damaging vascular and nervous structures. Physiological changes observed with aging are correlated with a concomitant increase in DM and its associated complications. Long-term complications, including peripheral and central neuropathies, micro- and macrovascular damage, retinopathy, and nephropathy are the major causes of mortality in diabetics [cardiovascular disease (CVD) being the primary complication causing death in this population]. All-cause mortality is three to four times greater in the DM population; hence, management of DM is of timely importance, particularly with a projected prevalence increase of 134% within the next 25 years among individuals over the age of 65 years. Exercise modalities, including endurance and resistance training, were employed to improve glycemic/metabolic control and to ameliorate the progression of DM-related complications. Several risk factors, including glucose levels, blood pressure, lipid/cholesterol profile, and BMI, are reportedly improved with these modes of exercise. However, not all studies demonstrate an improvement in risk factors, but consistently note improvement in complications and a reduction of DM incidence. There is convincing evidence that exercise, with or without specific improvements to traditional DM-related risk factors, is an effective therapy for the management of DM.
Referred pain from trapezius muscle trigger points shares similar characteristics with chronic tension type headache
Authors: Fernández‐de‐las‐Peñas César , Ge Hong‐You , Arendt‐Nielsen Lars , Cuadrado Maria Luz , Pareja Juan A. 
Published: August 2006

AbstractReferred pain and pain characteristics evoked from the upper trapezius muscle was investigated in 20 patients with chronic tension‐type headache (CTTH) and 20 age‐ and gender‐matched controls. A headache diary was kept for 4 weeks in order to confirm the diagnosis and record the pain history. Both upper trapezius muscles were examined for the presence of myofascial trigger points (TrPs) in a blinded fashion. The local and referred pain intensities, referred pain pattern, and pressure pain threshold (PPT) were recorded. The results show that referred pain was evoked in 85% and 50% on the dominant and non‐dominant sides in CTTH patients, much higher than 55% and 25% in controls (P<0.01). Referred pain spread to the posterior‐lateral aspect of the neck ipsi‐lateral to the stimulated muscle in both patients and controls, with additional referral to the temple in most patients, but none in controls. Nearly half of the CTTH patients (45%) recognized the referred pain as their usual headache sensation, i.e. active TrPs. CTTH patients with active TrPs in the right upper trapezius muscle showed greater headache intensity and frequency, and longer headache duration than those with latent TrPs. CTTH patients with bilateral TrPs reported significantly decreased PPT than those with unilateral TrP (P<0.01). Our results showed that manual exploration of TrPs in the upper trapezius muscle elicited referred pain patterns in both CTTH patients and healthy subjects. In CTTH patients, the evoked referred pain and its sensory characteristics shared similar patterns as their habitual headache pain, consistent with active TrPs. Our results suggest that spatial summation of perceived pain and mechanical pain sensitivity exists in CTTH patients.
Repair of tympanic membrane perforation using a modified cartilage–perichondrium composite ring graft
Authors: Mansour M H , Askar M H , Albirmawy O A 
Published: August 2006

Ring graft is a modified cartilage-perichondrium composite graft (CPCG) with only a peripheral ring shaped cartilage. In this series, tympanic membrane perforations were repaired using (ring graft) during treatment of 18 cases of non-cholesteatomatous chronic suppurative otitis media (CSOM).This study showed that ring graft has the advantages of both CPCG and perichondrial graft but without their disadvantages. Complete closure of the perforations was achieved in all cases without delay in hearing improvement.It is recommended to use the ring graft whenever needed to repair central tympanic membrane perforations even with difficult anterior or total perforations.
A clinical review of 128 cases of head and neck tuberculosis presenting over a 10-year period in Bradford, UK
Authors: Menon K , Bem C , Gouldesbrough D , Strachan D R 
Published: August 2006

Aims: To analyse the epidemiology, presentation and diagnosis of head and neck tuberculosis (TB).Methods: We conducted a 10-year retrospective study of all cases of tuberculosis of the head and neck region occurring in Bradford, UK.Results: Of a total of 1315 cases of TB, 128 presented with head and neck TB (12 per cent of which (15/128) were in children). Cervical lymph nodes were most commonly involved (87 per cent, 111/128), other sites being: salivary glands (five cases); larynx, oral cavity, eyes and ears (two cases each); and skin, thyroid, nasopharynx and retropharyngeal space (one case each). Patients' ethnic origins were Asian (89 per cent, 114/128), Caucasian (10 per cent, 13/128) and African (one case). Only 26 per cent (33/128) had constitutional symptoms, and 20 per cent (25/128) had a coexistent site of TB. Only 39 per cent (40/105) of surgical specimens were sent for culture.Conclusions: Isolated head and neck TB is not uncommon. Atypical presentations render diagnosis challenging, so awareness aids early diagnosis. Mycobacterial cultures should be performed, where possible, for diagnosis.
Prevention of postlaryngectomy pharyngocutaneous fistula using a sternocleidomastoid muscle collar flap
Authors: Albirmawy O A 
Published: August 2006

Objectives: The purpose of this study was to evaluate the efficacy of a sternocleidomastoid muscle collar flap in the prevention of pharyngocutaneous fistula in patients who had undergone total laryngectomy.Study design: Retrospective clinical study.Setting: Otolaryngology department, Tanta University, Egypt.Methods: Sixty-five consecutive total laryngectomy procedures performed between October 1999 and October 2005 were reviewed. The fistula rate in laryngectomy patients operated on prior to 2002, without sternocleidomastoid collar flap creation (group A) was compared with that of patients operated on after October 2002, at which time this flap was introduced for routine use during primary surgery (group B).Results: In group A, the incidence of pharyngocutaneous fistula was 12 in 35 (34 per cent) while its incidence in group B was 1 in 30 (3.3 per cent). On analysis, the risk factors within both the groups were essentially similar.Conclusion: The routine addition of a superiorly based sternal head of sternocleidomastoid muscle flap on one or both sides to cover the repaired pharynx during surgery reduced the incidence of postlaryngectomy pharyngocutaneous fistula, patient morbidity and mortality, and hospital stay; voice rehabilitation and swallowing were also improved.
Large-amplitude electrostatic solitary structures in a charge varying dusty plasma with vortex-like ion distribution
Authors: GOUGAM LEILA AIT , TRIBECHE MOULOUD , MEKIDECHE FAWZIA 
Published: August 2006

AbstractA numerical investigation is presented to show the existence, formation and possible realization of large-amplitude solitary potentials in a charge varying dusty plasma with trapped ion particles. These nonlinear localized structures are self-consistent solutions of the Vlasov equation representing saturated states of a three-stream unstable collisionless dusty plasma. The saturation is provided by an interplay between ion trapping and dust charging. It is found that under certain conditions the effect of dust charge variation can be quite important. In particular, it may be noted that the dust charge variation leads to an additional enlargement of the nonlinear localized structure. Furthermore, our results show that the dust charge variation provides an alternate physical mechanism causing dissipation and as a consequence causes the wave amplitude to decay and transfer to the so-called noise tail.
Anomalous absorption of the circularly polarized electromagnetic beams near the plasma frequency in a magnetized electron plasma
Authors: SESHADRI S. R. 
Published: August 2006

AbstractThe propagation of circularly polarized electromagnetic beams along the magnetostatic field in an electron plasma is investigated. As a consequence of a strong interaction with the medium, the beam spreads rapidly on propagation near the cutoff frequencies and the cyclotron resonant frequency of the corresponding plane waves, as well as near the plasma frequency. The power absorption for unit length near the cyclotron frequency and the plasma frequency are determined. For tightly focused beams, there is significant power absorption near the plasma frequency as compared with that at the cyclotron resonant frequency.
Distribution of putative adhesins in Shiga toxin-producingEscherichia coli(STEC) strains isolated from different sources in Chile
Authors: VIDAL M. , ESCOBAR P. , PRADO V. , HORMAZABAL J. C. , VIDAL R. 
Published: August 2006

SUMMARYThe distribution of three putative adhesin genes in 123 Shiga toxin-producing (STEC) strains was determined by PCR. The STEC strains were isolated from human patients (n=90) and food (n=33) and were characterized by serogroup, virulence markers (eae,stx1,stx2) and adherence factors (efa1,lpfAO157,saa) genes. Serogroups O157 (64·4%) and O26 (28·8%) were the most frequent among human strains and the majority (60·6%) of food strains were serologically non-typable. The adhesin genesefa1 (90%) andlpfAO157(73·3%) were the most common in humans strains andsaa(45·5%) in food strains. The presence of these genes in addition toeaein STEC from different sources may suggest a relevant role in their pathogenesis.
Comparison of ensemble‐MOS methods in the Lorenz '96 setting
Authors: Wilks D. S. 
Published: August 2006

AbstractA suite of methods that have been proposed for statistical post‐processing of ensemble forecasts based on historical verification data (i.e. ensemble‐MOS methods) are compared with each other, and with direct probability estimates using ensemble relative frequencies, in the idealised Lorenz '96 setting. The three most promising methods are logistic regressions predicting probabilities associated with selected quantiles, ensemble dressing (a kernel density estimation approach), and linear regressions with non‐constant prediction errors that depend on the ensemble variance. Copyright © 2006 John Wiley & Sons, Ltd.
Intercomparison of satellite‐based and model‐based rainfall analyses
Authors: Kästner Martina , Torricella Francesca , Davolio Silvio 
Published: August 2006

AbstractFour satellite rain estimations based on microwave (MW), infrared (IR) or combined MW‐IR techniques are compared with the BOlogna Limited Area Model (BOLAM) rain forecast for a severe weather event (8–13 November 2001) over the western Mediterranean Sea.Two of the investigated multi‐channel MW rainfall algorithms use data from the Tropical Rainfall Measuring Mission (TRMM). The Frequency Difference Algorithm relies on data from the TRMM Microwave Imager (TMI) and the other one combines data from the Precipitation Radar (PR) with those from the nine‐channel radiometer TMI, called PR Adjusted TMI Estimations of Rainfall (PATER) algorithm. The pure IR Rain Estimator uses geostationary IR METEOSAT data and the combined Naval Research Laboratory algorithm uses both MW data from low orbiting satellites and IR data from the geostationary orbit.Validation results, computed over a common grid, which is independent of the different field of view sizes of the applied data sets, indicate that there is generally a better performance for heavy rain (>6 mm h−1) than for light rain (<1 mm h−1). Both MW algorithms perform rather similarly, although PATER shows some rain detection problems due to thick aerosol loads originating from the desert. The BOLAM model presents a good agreement with the MW and only a minor location error of a heavy rain area was detected. Both IR‐based algorithms have problems in identifying the correct rainy areas compared to MW. Overall, the results suggest that there are advantages in combining both techniques –the well‐known rain physics of the MW channels with the high temporal resolution of IR algorithms –to retrieve precipitation from satellite data. Copyright © 2006 John Wiley & Sons, Ltd.