bluuebunny/crossref_metadata_2025_split huggingface dataset:
Freshwater crayfish farming technology in the 1990s: a European and global perspective
Authors: Ackefors H.E.G. 
Published: March 2003

This paper aims to describe the state of crayfish farming technology in the USA, Australia and Europe, and to discuss some of the prerequisites for this industry. Data from Europe are partly based on replies from a questionnaire sent out to scientists in all European countries. For other parts of the world, the crayfish literature has been reviewed and data from the August 2000 meeting of the International Association of Astacology are also included. Issues addressed in this review are cultivated species, production and productivity figures, production technique with regard to enclosures, reproduction and feed items, disease problems, predators, pond vegetation and water quality.Fewer than a dozen crayfish species are cultivated. The most attractive ones for culture and stocking in natural waters have been transferred to more than one continent. Pond rearing techniques predominate in all countries, and the technology required to achieve the spawning and rearing of juveniles is relatively simple. Pieces of fish, carrots and potatoes are frequent supplementary feed items; plants, cereals, pieces of meat, zooplankton and pellets are also common. Diseases are not usually a major concern, except in Europe where the American plague fungus, Aphanomyces astaci, has eradicated many European crayfish populations. Predators identified as common include insects and amphibians, as well as fishes, birds and mammals. Many water macrophytes are common in crayfish farms. These may either serve a useful function or cause problems for the crayfish farmer. Water temperature is the crucial factor for crayfish production. Water parameters such as pH and certain inorganic ion concentrations may also be of concern. Acidic waters that occur in some areas are generally detrimental to crayfish.The total yield from crayfish production from farming and fishery is in the order of 120 000–150 000 tonnes, more than four times the quantity given by FAO statistics. The largest crayfish producer is the Peoples’ Republic of China, followed by the USA (70 000 and 50 000 tonnes in 1999, respectively). Of the quantity produced in the USA in 1999, about 35 000 tonnes was farmed. The yield in Europe was about 4500 tonnes in 1994, and of this quantity only 160 tonnes came from aquaculture. There are no official statistics for crayfish fishery production in Australia, but about 400 tonnes came from aquaculture in 1999.
On species and speciation with reference to the fishes
Authors: Wiley E O 
Published: March 2003

AbstractThe nature of species and the processes in which they participate are subjects of continuing debate among evolutionary biologists. I begin by examining how ichthyologists treat species empirically. Such treatments provide a pattern of species and their relationships over time and space. I suggest that this empirical record points to a predominant mode of speciation: vicariant, Model I, allopatric speciation. I also suggest that species are real and that they are individuals. There is a single species concept, the evolutionary species concept (ESC), that best captures the way we think about fish species. This concept is also well integrated with the manner in which species are treated in Phylogenetic Systematics and with the philosophical concept that species are particulars rather than universals.
Estimating illegal and unreported catches from marine ecosystems: a basis for change
Authors: Pitcher Tony J , Watson Reg , Forrest Robyn , Valtýsson Hreiðar Þór , Guénette Sylvie 
Published: March 2003

AbstractTo evaluate the impacts of fishing on marine ecosystems, the total extraction of fish must be known. Putting a figure on total extraction entails the difficult task of estimating, in addition to reported landings, discards, illegal and unmandated catches. Unreported catches cast various types of shadow, which may be tracked and estimated quantitatively. Some shadows of unreported catches are reviewed, for example, an innovative, well‐funded NGO publicizes illegal catch in the Southern Ocean. For various reasons, official figures often have the implicit but unacceptable assumption that such categories are null. We present an estimation procedure based on adjustment factors taken from observer reports, correspondents and published information that track changes in a regulatory regime, and hence reflect incentives and disincentives to misreport. Monte Carlo simulations address uncertainty using multiple sources of information to provide upper and lower estimates. Once in place, this method provides preliminary estimates that may be refined without disruption. The method is demonstrated for fisheries in Iceland and Morocco. We use a ‘by‐species’ approach for Icelandic cod and haddock, while the Moroccan catch is divided into demersal and pelagic categories. Results suggest that Icelandic cod catches may have been underestimated by between 1 and 14% at different times, and haddock by between 1 and 28%. Underestimation of Moroccan catches appears to have been as much as by 50%. These case studies show that it is possible to obtain estimates of misreporting, even when direct data are lacking. Our method encourages transparency because sources of information are presented so that uncertain values are easily identified, offering a basis for comment, collaboration and refinement in estimating illegal and unreported fishing.
Phenomenological diversity of spinal reflexes in brain death
Authors: Spittler J. F. , Wortmann D. , Von Düring M. , Gehlen W. 
Published: March 2003

In brain death, spinal reflexes and automatisms are observed which may cause irritation and even doubt in the diagnosis. In the literature there are no dedicated descriptions of the diversity and of neuroanatomical considerations.In 278 examinations of 235 patients for the determination of brain death, on 42 occasions obvious spinal reflexes and/or spinal automatisms were observed in 27 brain dead bodies. Because they were not systematically searched for, minute forms have probably been missed.The reflexes (R) and automatisms (A) are described according to the time of observation in relation to the development of brain death, the presumable spinal localization and the possible phylogenetical interpretation. Especially disquieting examples are discussed in more detail, e.g. monophasic EndotrachealSuction–ThoracicContraction‐R supposedly switched in segments C2–6 or TrapeziusPinch–ShoulderProtrusion‐R conveyed by the accessory nerve (terminology according to the scheme: for the reflexes, Trigger‐Response‐R: for the automatisms, Movement‐A).After these experiences a more thorough examination showed frequent observations of rather minute forms of spinal reflexes, as well as automatisms and even the Lazarus sign (in possibly more than two thirds of the examinations). An estimation of the factual frequency would necessitate special attention to those much more frequent but less obvious minute spinal reflexes and automatisms.
Headache in Children in Dutch General Practice
Authors: van der Wouden JC , van der Pas P , Bruijnzeels MA , Brienen JA , van Suijlekom-Smit LWA 
Published: March 2003

Aim: To describe the occurrence of headache in general practice, the diagnoses made in general practice, and the management. Method: Data from the Dutch national survey of morbidity and interventions in general practice were used. The practice population (103 practices) comprised 63753 children aged 0-14 years. Results: In 634 episodes, headache was a reason for encounter. The incidence of headache presented to the general practitioner was 40.2 per 1000 person years. More than half of the episodes were related to an infectious disease, among which upper respiratory tract infections predominated. The incidence rate of the diagnosis idiopathic headache was 7.3 episodes per 1000 person years. The incidence increased with age and was higher in girls than in boys. In only 12% of cases of idiopathic headache were special investigations carried out, mostly blood examinations. Medication was prescribed in 27% of all episodes of idiopathic headache. In the absence of an infectious disease, many headache episodes were associated with psychosocial problems. Family problems and school problems were mentioned most often. Conclusion: Headache in children as reason for encounter is a common problem in general practice, often associated with an infectious disease. When confronted with a child with idiopathic headache, the general practitioner should be aware of a possible psychosocial component.
‘He will finish up caring for me’: people with learning disabilities and mutual care
Authors: Williams Val , Robinson Carol 
Published: March 2003

SummaryUntil recently, the carer's perspective has dominated research on families who include someone with a learning disability and recent legislation has underlined the carer's rights. Previous research has found that some more able people with learning disabilities were very aware of their parents' growing needs, and were taking on responsibilities within the family to help and support their carer/parents. However, recent legislation still dichotomizes family members into carers and cared‐for people. The present paper is based on a research study of the impact of the UK Carers Act 1995 on families with someone with a learning disability. It involved canvassing the views of people with learning disabilities about their experience of assessments and their relationships within the family. The present authors found that many people with learning disabilities expressed empathy for their carer's point of view and that several people (including some who had high support needs themselves) were performing care tasks for their elderly parents. However, no one appeared to recognize the situation as one of mutual care, and parents generally carried on defining themselves as carers since they took responsibility and exercised control. The present authors conclude that mutual caring is far more common than is recognized and includes people with severe learning disabilities. A more holistic approach to assessment of needs is required that can take into account the complex web of interdependence within a family. Rather than categorizing people into ‘carers’ and ‘cared‐for’, the present authors suggest a model that recognizes mutually supportive partnerships within the family.
Feeding problems, gastrostomy and families: a qualitative pilot study
Authors: Rouse Lindsey , Herrington Peter , Assey Joanna , Baker Roger , Golden Shirley 
Published: March 2003

SummaryFeeding problems are often found in children with severe and profound learning disabilities. It is increasingly common for these children to receive a gastrostomy button so that they can maintain an adequate nutritional intake. The psychological implications of this operation for families and carers have received little attention, with most studies focusing on medical and nutritional outcomes. The present paper describes the qualitative findings of interviews carried out with professionals and parents as part of a pilot study. The themes which emerged included the need for early multidisciplinary support and information for parents, improved communication between professionals, and problems relating to funding. Suggestions for improved service delivery are proposed.
Experimental study of aqueous fluid infiltration into quartzite: implications for the kinetics of fluid redistribution and grain growth driven by interfacial energy reduction
Authors: Nakamura M. , Watson E. B. 
Published: March 2003

AbstractTo investigate the kinetics of interfacial energy‐driven fluid infiltration, experiments were carried out in a quartzite–water system at 621–925°C and 0.8 GPa. Infiltration couples were made by juxtaposing presynthesized dry quartzite cylinders and fluid reservoirs. The infiltration process was confirmed by the presence of pores at the quartzite grain edges. As predicted from theoretical considerations and previous experiments, wetting fluids such as pure water and NaCl aqueous solution infiltrated into quartzite, whereas nonwetting CO2‐rich fluids did not. Newly precipitated quartz layers at the surfaces of the infiltrated sample proved that infiltration took place by a dissolution–precipitation mechanism.The enhancement of grain growth by fluid infiltration was observed over the entire range of experimental temperatures. The fluid fraction, gauged by the porosity of the run products, increases at the infiltration front and then decreases towards the fluid reservoir to form a high‐porosity zone with a maximum porosity of 2.3–2.9%. As infiltration proceeds, the high‐porosity zone advances like a travelling wave. This porosity wave is probably caused by a grain curvature gradient resulting from preferential grain growth in the infiltrated part of the quartzite, perhaps combined with other factors. The infiltration kinetics were modelled with a steady‐state diffusion model over the high‐porosity zone. The solubility difference between dissolving and precipitating grains was deduced to be 2 × 10−2−3 × 10−1 wt %. The experimentally obtained infiltration rate of aqueous fluid in the steady‐state diffusion regime (2 ± 0.5 × 10−8 m sec−1 at 823°C) is much faster than the estimated metamorphic fluid flux rates, so that interfacial energy‐driven fluid redistribution in quartz‐rich layers could significantly contribute to the fluid flux in high‐grade metamorphism, at least over a short distance.Cathodoluminescence observations of the run products revealed that the grain growth of quartzite in the presence of fluid proceeds extensively, which would promote the chemical equilibration between fluid and rock more effectively than would volume diffusion in quartz crystals.
An exhumed palaeo‐hydrocarbon migration fairway in a faulted carrier system, Entrada Sandstone of SE Utah, USA
Authors: Garden I. R. , Guscott S. C. , Burley S. D. , Foxford K. A. , Walsh J. J. , Marshall J. 
Published: March 2003

AbstractThe Moab Anticline, east‐central Utah, is an exhumed hydrocarbon palaeo‐reservoir which was supplied by hydrocarbons that migrated from the Moab Fault up‐dip towards the crest of the structure beneath the regional seal of the Tidwell mudstone. Iron oxide reduction in porous, high permeability aeolian sandstones records the secondary migration of hydrocarbons, filling of traps against small sealing faults and spill pathways through the Middle Jurassic Entrada Sandstone. Hydrocarbons entered the Entrada Sandstone carrier system from bends and other leak points on the Moab Fault producing discrete zones of reduction that extend for up to 400 m from these leak points. They then migrated in focused stringers, 2–5 m in height, to produce accumulations on the crest of the anticline. Normal faults on the anticline were transient permeability barriers to hydrocarbon migration producing a series of small compartmentalized accumulations. Exsolution of CO2 as local fault seals were breached resulted in calcite cementation on the up‐dip side of faults.Field observations on the distribution of iron oxide reduction and calcite cements within the anticline indicate that the advancing reduction fronts were affected neither by individual slip bands in damage zones around faults nor by small faults with sand: sand juxtapositions. Faults with larger throws produced either sand: mudstone juxtapositions or sand: sand contacts and fault zones with shale smears. Shale‐smeared fault zones provided seals to the reducing fluid which filled the structural traps to spill points.
Criteria of food quality in different contexts
Authors: Meiselman Herbert L. 
Published: March 2003

AbstractFood quality is considered from three perspectives: the product, the consumer, and the food service environment. These are examined in the chronological order in which they developed in the food field. Product quality is still the most common usage of the term quality and originated in quality assurance/quality control with its focus on defect avoidance and conformance to specifications. Consumer perceptions of quality are a newer view of quality, although some writers argue that all judgments of quality are consumer‐based in the end. The consumer view of quality underscores that quality is relative and situational. Service quality is the newest dimension of quality to be considered. It is argued that food quality in the food service environment should consider both food quality and service quality. A number of conclusions for consideration of food quality are presented.
National‐scale conservation assessments at an appropriate resolution
Authors: Hopkinson Paul , Evans Julianne , Gregory Richard D. 
Published: March 2003

Abstract.  Most national‐scale conservation assessments are carried out at a resolution that is different from the actual size of protected areas in the study region. Coincidence between nature reserves and both hotspots (areas of high species richness) and complementary areas (sets of sites within which all species are represented) have been reported. However, the resolution (size of grid cells) of the species’ distribution data upon which many of these studies are based is often close to an order of magnitude larger than the size of the reserves. Presumably, only a proportion of the species recorded in the coarse grid cells will actually be present on reserves. We use fine (2 × 2‐km square grid cells) and coarse (10 × 10‐km square grid cells) resolution data of national distributions for breeding birds throughout Great Britain, and presence data for avian species on Royal Society for the Protection of Birds (RSPB) nature reserves, to investigate the proportion of species in the local area (100 km2) that are actually present on reserves. RSPB reserves contain between 50% and 70% of species from the local area. These proportions are significantly higher than for randomly selected, non‐reserve areas, indicating that RSPB reserves contain higher concentrations of bird species than the wider countryside. Furthermore, on RSPB reserves these proportions of threatened and non‐threatened species are equal, whereas in non‐reserve areas the proportions of non‐threatened species are significantly higher than threatened species. Thus, reserves hold a higher proportion of threatened species than occurs in the wider countryside.
Heterogeneity, speciation/extinction history and climate: explaining regional plant diversity patterns in the Cape Floristic Region
Authors: Cowling R. M. , Lombard A. T. 
Published: March 2003

Abstract.This paper investigates the role of heterogeneity and speciation/extinction history in explaining variation in regional scale (c. 0.1–3000 km2) plant diversity in the Cape Floristic Region of south‐western Africa, a species‐ and endemic‐rich biogeographical region. We used species‐area analysis and analysis of covariance to investigate geographical (east vs. west) and topographic (lowland vs. montane) patterns of diversity. We used community diversity as a surrogate for biological heterogeneity, and the diversity of naturally rare species in quarter degree squares as an indicator of differences in speciation/extinction histories across the study region. We then used standard statistical methods to analyse geographical and topographic patterns of these two measures. There was a clear geographical diversity pattern (richer in the west), while a topographic pattern (richer in mountains) was evident only in the west. The geographical boundary coincided with a transition from the reliable winter‐rainfall zone (west) to the less reliable non‐seasonal rainfall zone (east). Community diversity, or biological heterogeneity, showed no significant variation in relation to geography and topography. Diversity patterns of rare species mirrored the diversity pattern for all species. We hypothesize that regional diversity patterns are the product of different speciation and extinction histories, leading to different steady‐state diversities. Greater Pleistocene climatic stability in the west would have resulted in higher rates of speciation and lower rates of extinction than in the east, where for the most, Pleistocene climates would not have favoured Cape lineages. A more parsimonious hypothesis is that the more predictable seasonal rainfall of the west would have favoured non‐sprouting plants and that this, in turn, resulted in higher speciation and lower extinction rates. Both hypotheses are consistent with the higher incidence of rare species in the west, and higher levels of beta and gamma diversity there, associated with the turnover of species along environmental and geographical gradients, respectively. These rare species do not contribute to community patterns; hence, biological heterogeneity is uniform across the region. The weak topography pattern of diversity in the west arises from higher speciation rates and lower extinction rates in the topographically complex mountains, rather than from the influence of environmental heterogeneity on diversity.
Biotransformation in vitro of the 22R and 22S epimers of budesonide by human liver, bronchus, colonic mucosa and skin
Authors: Cortijo Julio , Urbieta Elena , Bort Roque , V.castell Jose , Ruiz‐Bravo Carlos , Martinez Jorge , Palacios‐Pelaez Ricardo , Lledó Salvador , Morcillo Esteban J. 
Published: March 2003

The pharmacological effects of glucocorticoids are greatly influenced by their pharmacokinetic properties. In the present report, the in vitro biotransformation of the 22R and 22S epimers of the topical steroid budesonide was studied in the S‐9 fraction of human liver, bronchus, skin and colonic mucosa.The disappearance of unchanged epimers of budesonide was measured during 90 min of incubation by high performance liquid chromatography. The rate of disappearance was high in human liver while little biotransformation occurred in bronchial tissue and colonic mucosa, and none was detected in the skin. A marked decay of the initial concentration of unchanged budesonide epimers was noticed after 2 h incubation in cultured human hepatocytes, while only a small decrease was observed after 24 h incubation in cultured human airway smooth muscle cells and BEAS‐2B cells. The 22R epimer of budesonide suffered greater in vitro biotransformation than the 22S epimer in human hepatic, bronchial and colonic tissues.These findings extend those of other studies, and confirm that the high therapeutic ratio of budesonide is due to negligible local biotransformation combined with high level of liver metabolism for locally absorbed budesonide.
Inhibition of rat parotid and submandibular gland functions by ofloxacin, a fluoroquinolone antibiotic
Authors: Abdollahi Mohammad , Isazadeh Zahra 
Published: March 2003

While fluoroquinolones are widely used in the treatment of various infectious disease, not enough attention has been paid to their adverse effects on salivary glands functions. In the present study, the effects of ofloxacin, a fluoroquinolone antibiotic, on rat parotid and submandibular gland functions, were examined in an acute experiment. Ofloxacin (OFLX) was administered intraperitoneally at various doses (20, 40, and 80 mg/kg). Pure parotid and submandibular saliva were collected intraorally by microployethylene tubes under anaesthesia using a dissecting microscope. Flow rate, amylase activity, total protein, and calcium concentrations were reduced by all doses of OFLX (20, 40, 80 mg/kg, P < 0.01) in parotid saliva. In parotid saliva, sodium and potassium were increased by doses of 20 and 40 mg/kg (P < 0.01) and 20, 40, 80 mg/kg (P < 0.01) respectively. In submandibular saliva, flow rate, total protein and calcium concentrations were significantly reduced by all doses (20, 40, 80 mg/kg, P < 0.01). Sodium and potassium concentrations were also increased by a dose of 80 mg/kg, (P < 0.05) in submandibular saliva.It is concluded that ofloxacin inhibits rat salivary gland functions, which might be observed as a side‐effect in humans. Properties of fluoroquinolones to alter intracellular cAMP and calcium levels and their ability to suppress DNA, RNA and protein synthesis of acinar cells might be possible reasons for the observed changes.