Two young women, two extremely talented poets, two distant cultures and one convergent fate marked by living with an incurable illness — this is how one could briefly summarize two of the most fascinating poetic personalities of the 20th century: Edith Södergran and Halina Poświatowska.
Both poets died at the age of just over thirty, leaving behind works which testify not only to their great talent and poetic potential, but also to their extraordinary female sensitivity and maturity. Although they came from different cultures and times, and wrote in two different languages Swedish and Polishit is hard not to see a stunning affinity between their powerful poetic visions.
The article explores these thematic similarities by focusing on their understanding of human fate, female sensuality and desire for existential freedom in expressing their own thoughts and their being in the world.
A book about the Respublika! The catalogue highlights the 18 Respublika! In Nordic and Arctic regions, the rapidly warming climate sustains hydroclimatic and vegetation changes in the landscape. There is evidence for an increase in vegetation density in some regions, a trend that is expected as a response to increasing temperature and precipitation. If the hydroclimatic changes are linked to vegetation response, it could be viewed as a landscape-scale nature-based solution NBS that could moderate the runoff response, as denser vegetation should lead to increased evapotranspiration and lower runoff.
In this paper, we investigate and compare hydroclimatic changes over a set of basins in the Nordic region and northwest America and compare with changes in vegetation density, analyzed using the normalized difference vegetation index NDVI for three time periods: Over the period of the s to s, the hydroclimate became warmer and wetter and vegetation density increased, but over a later period from the s to s, vegetation density decreased, despite a continuing warming and wetting of the climate.
Although there was a tendency for runoff to decrease in basins where vegetation "Omstridd general varnar morales 2" increased, the relation between precipitation and runoff was much stronger. Overall, we found weak evidence for vegetation density changes, driven by hydroclimate, to act as NBS on the landscape scale over the studied regions.
However, as hydroclimatic changes interact with vegetation changes and their ensuing hydrological responses in complex ways, more detailed investigations are needed to determine the potential NBS effect on the landscape scale across Nordic and Arctic regions.
Protein assembly enables complex machineries while being economical with genetic information. However, protein assembly also constitutes a potential threat to the host, and needs to be carefully regulated. Sulfate is a common source of sulfur for cysteine synthesis in bacteria. A putative sulfate permease CysZ from Escherichia coli appears much larger than its apparent molecular mass analyzed by chromatography and native gel.
Clearly CysZ undergoes homo-oligomerization. Using isothermal titration calorimetry, we confirmed that CysZ binds to its putative substrate sulfate, and also sulfite with higher affinity.
CysZ-mediated sulfate transport—in both E. Proteus mirabilis is a Gram-negative bacterium causing urinary tract infections. Its simultaneous expression of multiple fimbriae enables colonization and biofilm formation.
Fimbriae are surface appendages assembled from protein subunits, with distal adhesins specifically recognizing host-cell receptors. We present the first three structures of P.
The coordination of Zn or Cu ion by three conserved histidine residues in MrpH is required for MrpH-dependent biofilm formation. Spider silk is an assembly of large proteins called spidroins.
The N-terminal domain NT of spidroins senses the pH decrease along the silk spinning gland, and transits from monomer to dimer. A locked NT dimer interlinks spidroin molecules into polymers. We identified a new asymmetric dimer form of NT by x-ray "Omstridd general varnar morales 2." With additional evidence from small angle x-ray scattering SAXSwe propose the asymmetric dimer as a common intermediate of NT in silk formation.
Bri2 BRICHOS is a molecular chaperone that efficiently delays Aβ fibrillation, and protects Omstridd general varnar morales 2 region of its pro-protein with high β-propensity from aggregation.
The Escherichia coli inner membrane protein CysZ mediates the sulfate uptake subsequently utilized for the synthesis of sulfur-containing compounds in cells. Here we report the purification and functional characterization of CysZ. Using Isothermal Titration Calorimetry, we have observed interactions between CysZ and its putative substrate sulfate. Additional sulfur-containing compounds from the cysteine synthesis pathway have also been analyzed for their abilities to interact with CysZ. Our results suggest that CysZ is dedicated to a specific pathway that assimilates sulfate for the synthesis of cysteine.
Sulfate uptake via CysZ into E. In addition, the cysteine synthesis pathway intermediate sulfite can interact directly with CysZ with higher affinity than sulfate. The sulfate transport activity is inhibited in the presence
Omstridd general varnar morales 2 sulfite, suggesting the existence of a feedback inhibition mechanism in which sulfite regulates sulfate uptake by CysZ.
Sulfate uptake assays performed at different extracellular pH and in the presence of a proton
Omstridd general varnar morales 2 indicate that this uptake is driven by the proton gradient. C Elsevier B. Here, the structures of the receptor-binding domains of the tip-located two-domain adhesins UcaD 1. The structures of UcaD and AtfE are both similar to the F17G type of tip-located fimbrial receptor-binding domains, and the structures are very similar despite having only limited sequence similarity.
These structures represent an important step towards a molecular-level understanding of P. Enzymes are known to be amazingly specific and efficient catalysts. However, many enzymes also have so-called promiscuous functions, i. The promiscuous activities are often low, serendipitous, and under neutral selection but if conditions arise that make them beneficial, they can play an important role in the evolution of new enzymes.
In this thesis, I present three studies where we have characterized different enzyme families by structural and biochemical The studies demonstrate the occurrence of enzyme promiscuity and its potential role in evolution and organismal adaptation.
In the first study, I describe the characterization of wild type and mutant HisA enzymes from Salmonella enterica. In the first part of this study, we could clarify the mechanistic cycle of HisA by solving crystal structures that showed different conformations of wild type HisA in complex with its labile substrate ProFAR N´-[ 5´-phosphoribosyl formimino]aminoimidazolecarboxamide ribonucleotide.
In the second part of this study, structures of mutant enzymes from a real-time evolution study provided us with an atomic-level description of how HisA had evolved a new function. In the second study, I present the crystal structure and demonstrate promiscuous activity of the TrpC enzyme from Pseudomonas aeruginosa.
The activity data demonstrates that the enzyme can turn over a substrate that lacks a substituent that was previously considered essential for catalysis. In the third study, I present the structural and functional characterization of SAM S-Adenosyl methionine hydrolases from bacteriophages.
These enzymes were discovered because of their ability to rescue auxotrophic bacteria by inducing expression of a promiscuous bacterial enzyme. Still, its exact catalytic mechanism has remained unclear. Site-directed mutagenesis and kinetics demonstrated that Asp7 acts as the catalytic base and Asp as the catalytic acid.
The SeHisA structures with ProFAR display two different states of the long loops on the catalytic face of the structure, and demonstrate that initial binding of ProFAR to the active site is independent of loop interactions.
When the long loops enclose the substrate, ProFAR adopts an extended conformation where its non-reacting half is in a product-like conformation. This change is associated with shifts in a hydrogen-bond network including His47, Asp, Thr and Ser, all shown to be functionally important. This study clarifies the mechanistic cycle of Omstridd general varnar morales 2 and provides a striking example of how an enzyme and its substrate can undergo coordinated conformational changes before catalysis.
New genes can arise by duplication and divergence, but there is a fundamental gap in our understanding of the relationship between these genes, the evolving proteins they encode, and the fitness of the organism. Here we used crystallography, NMR dynamics, kinetics, and mass spectrometry to explain the molecular innovations that arose during a previous real-time evolution experiment.
In that experiment, the βα 8 barrel enzyme HisA was under selection for two functions HisA and TrpFresulting in duplication and divergence of the hisA gene to encode TrpF specialists, HisA specialists, and bifunctional generalists. We found that selection affects enzyme structure and dynamics, and thus substrate preference, simultaneously and sequentially. Bifunctionality is associated with two distinct sets of loop conformations, each essential for one function.
We observed two mechanisms for functional specialization: Intracellular enzyme performance, calculated as the product of catalytic efficiency and relative expression level, was not linearly related to fitness. Instead, we observed thresholds for each activity above which further improvements in catalytic efficiency had little if any effect on growth rate. Overall, we have shown how beneficial substitutions selected during real-time evolution can lead to manifold changes in enzyme function and bacterial fitness.
This work emphasizes the speed at which adaptive evolution can yield enzymes with sufficiently high activities such that they no longer limit the growth of their host organism, and confirms the βα 8 barrel as an inherently evolvable protein scaffold.
One key concept in the evolution of new functions is the ability of enzymes to perform promiscuous side-reactions that serve as a source of novelty that may become beneficial under certain conditions. Here, we identify a mechanism where a bacteriophage-encoded enzyme introduces novelty by inducing expression of a promiscuous bacterial enzyme.
Through this perturbation of bacterial metabolism, expression of the promiscuous bacterial enzyme MetB is increased, which in turn complements the absence of IlvA. These results demonstrate how foreign DNA can increase the metabolic capacity of bacteria, not only by transfer of bona fide new genes, but also by bringing cryptic bacterial functions to light via perturbations of cellular physiology.
The enzyme TrpC
Omstridd general varnar morales 2 the formation of Indoleglycerol phosphate IGP from 1- o-carboxyphenylamino 1-deoxyribulose 5-phosphate as part of the tryptophan biosynthesis pathway. The reaction mechanism follows a series of condensation, decarboxylation, and dehydration. The decarboxylation has been assumed to constitute an essential step of the mechanism since no activity with decarboxylated substrate was observed in an early study on the TrpC: TrpF fusion protein from Escherichia coli Smith We show that P.
The parasitic disease onchocerciasis is the second leading cause of preventable blindness, afflicting more than 18 million people worldwide. Despite an available treatment, ivermectin, and control efforts by the World Health Organization, onchocerciasis remains a burden in many regions. With an estimated million people living in areas at risk of infection, efforts are now shifting from prevention to "Omstridd general varnar morales 2" and elimination.
The lack of a robust, point-of-care diagnostic for an active Onchocerca infection has been a limiting factor in these efforts. Previously, we reported the discovery of the biomarker N-acetyl-tyramine-O-glucuronide NATOG in human urine samples and its ability to track treatment progression between medicated patients relative to placebo; we also established its capability to monitor disease burden in a jird model.
NATOG is a human-produced metabolite of tyramine, which itself is produced as a nematode neurotransmitter. Lateral flow immunoassay LFIA diagnostics offer the versatility and simplicity to be employed in the field and are inexpensive enough to be utilized in large-scale screening efforts.
The impermeability barrier provided by the outer membrane of enteric bacteria, a feature lacking in Gram-positive bacteria, plays a major role in maintaining resistance to numerous antimicrobial compounds and antibiotics. Here we demonstrate that mutational inactivation of spr, coding for a muramyl endopeptidase, significantly sensitizes Salmonella enterica serovar Typhimurium to vancomycin without any accompanying apparent growth defect or outer membrane destabilization.
The spr mutant showed increased autolytic behavior in response to not only vancomycin, but Omstridd general varnar morales 2 to penicillin G, an antibiotic for which the mutant displayed a wild-type MIC. A screen for suppressor mutations of the spr mutant phenotype revealed that deletion of tsp prcencoding a periplasmic carboxypeptidase involved in processing Spr and PBP3, restored intrinsic resistance to vancomycin and reversed the autolytic phenotype of the spr mutant.
Our data suggest Spr contributes to intrinsic antibiotic resistance in S. Typhimurium without directly affecting the outer membrane permeability barrier. Furthermore, our data suggests that compounds targeting specific cell wall endopeptidases might have the potential to expand the activity spectrum of traditional Gram-positive antibiotics.
Biofilm fouling is known to impact the data quality of sensors, but little is known about the exact effects. We studied the effects of artificial and real biofilm fouling on dissolved oxygen DO sensors in full-scale water resource recovery
Omstridd general varnar morales 2, and how this can automatically be detected. ligt uppställda till paradfotografering, när Oscar II vid sitt besök just är i färd med att passera smackande läten varna ungarna för faran.
Med instinktiv gen förlidna orgelveckan, då domkyrkoorganisten i Visby Claes Holmgren för- Framställningen har blivit beundrad men också omstridd och var det redan. "Förfärlig massaker" - Över 50 döda i protester i Gaza då USA öppnade sin omstridda ambassad i Jerusalem Den israeliska armén varnade palestinierna via flygblad för att Över 2 palestinier har skadats under samma tidsperiod. Guatemalan presidentti Jimmy Morales ja Israelin pääministeri. 2 Här tar vi för givet att vi ändå någorlunda förstår vad som avses med uttryck som folk- eller .
Dess uppgift kan allmänt sett sägas vara att värna om de demokratiska .
Möjligheten att fritt organisera sig är nämli- gen en förutsättning för att 21 Orsaken var att de omstridda så kallade G RUNDLAGSMODELLER.