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Recruitment from resting stages among bloom-forming cyanobacteria

Popular Abstract in Swedish BLÅGRÖNALGERS VILOSTADIER—EN VIKTIG LÄNK TILL ALGBLOMNINGAR ALGBLOMNINGAR Algblomningar i Östersjön och i många av våra sydsvenska insjöar har blivit ett vanligt inslag sommartid. Vi vet att övergödning av våra vatten orsakar detta genom att överskottsnäring tillför's från olika mänskliga aktiviteter från land. Dock vet vi inte exakt vad det är som styr när och hur desCyanobacteria are known to form heavy blooms in eutrophicated freshwaters and also form resting stages, associated with the sediments, during harsh growth conditions. These resting stages can serve as inoculum for pelagic populations and function as a potential source for bloom formations. However, the factors involved in initiating recruitment from resting stage to the pelagic phase are not fully

An open access technique to create pneumoperitoneum in laparoscopic surgery.

BACKGROUND: An open access technique might reduce severe vascular and visceral injuries. An open access technique through the umbilical cicatrix tube has been developed as a routine method with the goal to be easy, safe and used by all surgeons in patients without a previous midline incision. AIM: To evaluate the open technique in a prospective study in 100 consecutive laparoscopic operations rega

Assessment and monitoring of reliability and robustness of offshore wind energy converters

The preseni paper provides an overview of existing approaches for design and assessment of offshore structures and on this basis proposes a framework for the risk based assessment and monitoring of the performance of offshore wind energy converters in operation. In recognition of the fact that there are presently no established best practices for the assessment and monitoring of offshore wind ener

Charge transport in III-V narrow bandgap semiconductor nanowires

This thesis describes charge transport in III-V narrow bandgap semiconductor nanowires. We are particularly interested in quantum transport in InSb, InAs and InP-InAs core-shell nanowires. According to the type of transport mechanism dominating in the devices, this thesis can be divided into four parts.In the first part of this thesis, we investigated the temperature dependent transport properties

Effects of ultraviolet-radiation on viability of isolated beta-vulgaris and hordeum-vulgare protoplasts

Estimates of viability as measured by vital staining with fluorescein diacetate (FDA) were carried out on freshly isolated and partially aged (16-h-old) B. vulgaris and H. vulgare mesophyll protoplasts following irradiation with UV-B. Damage to the photosynthetic system by UV-B was determined by delayed light emission (DLE). In the case of freshly isolated protoplasts Beta was .apprx. 30% more sus

Mitigation Costs for Bioenergy Systems and Natural Gas Systems with Decarbonization

In Sweden today, power production with bioenergy systems is more costly than with fossil energy systems. New technology under development, such as integrated gasification and combined cycle technology (IGCC), and reduced biomass costs would improve the competitiveness of bioenergy systems. The CO2 mitigation costs are lower for biomass systems using IGCC technology than for natural gas systems usi

Binding of complement regulators to invasive nontypeable Haemophilus influenzae is not increased compared to nasopharyngeal isolates, but serum resistance is linked to disease severity.

The aim of the present study was to analyse the importance for non-typeable Haemophilus influenzae (NTHi) isolated from patients with sepsis (invasive isolates) compared to nasopharyngeal isolates from patients with upper respiratory tract infection to resist the complement-mediated attack in human serum and to correlate this to disease severity. We in detail studied and characterized cases of inv

Gene-environment interactions for arsenic metabolism and metal-related oxidatively generated DNA damage

Popular Abstract in Swedish Arsenik (As) finns i grundvatten på många platser i världen, och mer än 100 miljoner människor världen över exponeras dagligen för As via dricksvatten. Kronisk exponering för As kan orsaka bl.a. cancer, hjärt-kärlsjukdom och diabetes. När As omsätts (metaboliseras) i kroppen bildas flera olika omsättningsprodukter (metaboliter) emellan vilka giftigheten skiljer sig åt. Over 100 million people around the world are exposed to high concentrations of arsenic (As) in drinking water, associated with a number of adverse health effects such as skin, lung and bladder cancer, vascular diseases and diabetes. In humans, As is metabolized via alternating reduction and methylation reactions, from inorganic As (iAs) into monomethylated (MMA) and dimethylated As (DMA). The most

Atmospheric methane removal by boreal plants

Several studies have proposed aerobic methane (CH4) emissions by plants. If confirmed, these findings would further increase the imbalance in the global CH4 budget which today underestimates CH4 sinks. Oxidation by OH-radicals in the troposphere is the major identified sink followed by smaller contribution from stratospheric loss and oxidation by methano- and methylotrophic bacteria in soils. This

Experimental and modeling study of laminar burning velocity of biomass derived gases/air mixtures

Laminar burning velocities of four biomass derived gases have been measured at atmospheric pressure over a range of equivalence ratios and hydrogen contents, using the heat flux method on a perforated flat flame burner. The studied gas mixtures include an air-blown gasification gas from an industrial gasification plant, a model gasification gas studied in the literature, and an upgraded landfill g

Parental Gender Equality and Use of Oral Contraceptives Among Young Women: A Longitudinal, Population-based Study in Sweden

Background: Little is known about how parental gender equality early in their children lives can influence daughters’ decision to use contraceptive pills. Aim:The study aimed at exploring whether maternal working time and paternity leave in Sweden during the first two years of their daughters’ lives is associated with the use of oral contraceptives when they are adolescents or young adults. Materi

Weak Environmental Magnetic Fields Inhibit Spontaneous Bioelectrical Activity in Snail Neurons

The interest in the evaluation of health effects due to EMF has accelerated in the last decades, mostly motivated by the occupational and environmental exposures to humans by such non-ionizing fields. The increasing exposure to electromagnetic fields has been suspected to contribute to the rising incidence of cancer in industrialized countries Despite detailed analysis which provide a wealth of ac

Initial Survey of Concrete Structures in Swedish Harbours – A Case Study in the Port of Trelleborg

This paper is a case study on how to perform a survey of concrete structures in Swedish harbours. The purpose of the survey is to detect common damages and signs of deterioration on concrete structures in marine environment. The survey should consist of information about the structural design for the structures together with climatic conditions for the harbour in question, as well as documentation

Optical techniques for measurements of atmospheric trace gases

Differential optical absorption spectroscopy (DOAS) and differential absorption lidar (DIAL) have been used for measurement of atmospheric trace gases. A fully automated system for atmospheric pollution monitoring of a medium-sized city has been constructed, based on the DOAS technique. Detection of ammonia and aromatic hydrocarbons in the ultraviolet spectral region has been investigated and demo

Component of the alternative oxidase localized to the matrix surface of the inner membrane of plant mitochondria

In mitoplasts from Arum maculatum spadices, succinate dehydrogenase (EC 1.3.99.1) and the alternative, cyanide-resistant oxidase activity (measured as m-chlorobenzhydroxamic acid-sensitive duroquinol oxidation) was unaffected by treatment with trypsin. In contrast, when 85% inside-out submitochondrial particles were treated with trypsin the alternative oxidase activity was inhibited by about 50% a