Lung tumours swell when prodded by airway microbes
Lung tumours swell when prodded by airway microbes, Published online: 04 February 2019; doi:10.1038/d41586-019-00357-w
Respiratory-tract bacteria stimulate immune cells, which encourages tumour cells to multiply.
Bitcoin for the biological literature
Bitcoin for the biological literature, Published online: 04 February 2019; doi:10.1038/d41586-019-00447-9
Scientific publishing is increasingly adopting the technology underlying cryptocurrencies.
Four steps to food security for swelling cities
Four steps to food security for swelling cities, Published online: 04 February 2019; doi:10.1038/d41586-019-00407-3
Combine pockets of rural land, reduce food waste, improve farming and encourage urbanites to eat less meat, urge Baojing Gu and colleagues.
CasX enzymes comprise a distinct family of RNA-guided genome editors
CasX enzymes comprise a distinct family of RNA-guided genome editors, Published online: 04 February 2019; doi:10.1038/s41586-019-0908-x
CRISPR–CasX represents a distinct RNA-guided platform that is functionally separate from Cas9 and Cas12a and is active for bacterial and human genome modification.
Arctic scientists iced out by US–India radar mission
Arctic scientists iced out by US–India radar mission, Published online: 04 February 2019; doi:10.1038/d41586-019-00278-8
Managers' decision to focus their satellite on the Antarctic has upset some researchers who study ice around the northern pole.
Links between gut microbes and depression strengthened
Links between gut microbes and depression strengthened, Published online: 04 February 2019; doi:10.1038/d41586-019-00483-5
The once-wild idea that intestinal bacteria influence mental health has transformed into a major research pursuit.
Indian government to boost stipend for early-career scientists
Indian government to boost stipend for early-career scientists, Published online: 04 February 2019; doi:10.1038/d41586-019-00477-3
But researchers say the 25% increase is not enough to meet living costs.
Daily briefing: Evolution from soup to nuts
Daily briefing: Evolution from soup to nuts, Published online: 01 February 2019; doi:10.1038/d41586-019-00454-w
An ambitious experiment to illuminate the full process of evolution by natural selection in a wild population, a 3D printer creates an entire object at once and how to master editing an anthology.
Even though periodontal health was suggested to be not related to the traction technique, some other variables might influence the esthetic outcome of palatally displaced canines (PDC) when aligned, such as th...
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Bioremediation using microorganisms is a promising strategy to remediate soil with petroleum hydrocarbons. Streptomyces sp. Hlh1, an endophytic strain, has previously demonstrated the ability to degrade crude petroleum in liquid culture. To apply this strain at field scale, it is necessary to test its ability to colonize the soil, compete with native microbiota, and remove the petroleum hydrocarbons under unfavorable conditions. Herein, a study was conducted to evaluate the performance of Streptomyces sp. Hlh1 to remove crude petroleum from contaminated sterilized and non-sterilized soils.
Soils samples, contaminated with 2%, 5%, and 10% of petroleum, were inoculated with Streptomyces sp. Hlh1, and incubated at 30 °C for 4 weeks. At the end of bioremediation assays, the pollutant concentrations were determined by Gas chromatography flame ionization detector and the degradation rates were also calculated. The survival of the strain in the soil was estimated and the toxicity of metabolites was evaluated on Lactuca sativa.
Streptomyces sp. Hlh1 was able to grow and remove total petroleum hydrocarbons (TPH), n-alkanes, and aromatic hydrocarbons found in soil samples. In sterilized soil samples, Streptomyces sp. Hlh1 removed up to 40% of TPH at an initial concentration of 10%. Whereas, the maximum TPH removal reached was 55% in non-sterilized soil at an initial concentration of 2%. In addition, it was observed that the degradation of aromatic hydrocarbons was more active than n-alkanes. The strain grew well and produced high biomass in contaminated soil. Lettuce seedling was found to be the adequate bioindicator to assess the toxicity of petroleum end products. Streptomyces sp. Hlh1 performed a successful bioremediation, which was confirmed through the phytotoxicity test.
The study shows the first insight of the contribution of free endophytic actinobacterial strain in the bioremediation of petroleum-contaminated soil; therefore, it suggests that Streptomyces sp. Hl1 can be usefully exploited at field scale.
Depression and Anxiety are two important public health problems that are known to be associated with viral infections. The association between the intake of nutrients such as zinc and copper with symptoms of depression has been studied previously. The aim of the current study was to investigate the association between depression with human T cell lymphotropic virus type 1 (HTLV-1) infection and serum content of zinc and copper in a large Iranian population cohort. The study population consisted of 279 HTLV-1-positive patients who were identified after recruitment as part of a large cohort study: the Mashhad Stroke and Heart Association Disorder (MASHAD) study. They were divided into two groups of diagnosed with or without depression based on their symptoms. Serum zinc and copper levels of all subjects were measured using the flame atomic absorption spectrometry. The population sample comprised of 279 individuals infected with HTLV-1 of whom 192 (68.8%) were women. The mean serum zinc in the group with and without depression was 78.69 ± 13.79 μg/dl and 86.87 ± 19.44 μg/dl, respectively (p < 0.001). Also, the serum copper level was higher in the depressive group (116.75 ± 39.56) than in the non-depressive group (104.76 ± 30.77) (p 0.004). The association between serum zinc and copper with depression in HTLV-1-infected patients which was shown in this study could be considered in the treatment strategies in these patients.
Early diagnosis of acute compartment syndrome (ACS) of the leg is essential to improve the outcome. Direct invasive measurement is currently recommended to measure intracompartmental pressure. A non-invasive a...
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