Whither the genus and the order Thermoanaerobacterales: phylogeny, taxonomy, ecology, and phenotype.

The order Thermoanaerobacterales currently consists of fermentative anaerobic bacteria, including the genus . are represented by thirteen species; all, but one, have closed genome sequences. Interest in these extreme thermophiles has been motivated not only by their high optimal growth temperatures (≥70°C), but also by their ability to hydrolyze polysaccharides including, for some species, both xylan and microcrystalline cellulose.

A Case Series of Spontaneous Pneumomediastinum With/Without Pneumothorax in COVID-19.

With the previous worldwide initial coronavirus disease 2019 (COVID-19) pandemic, a notable rise in spontaneous pneumomediastinum with/without pneumothorax (SPP) has been noted. Most cases were initially reported as complications secondary to barotrauma from mechanical ventilation (MV) with COVID-19. However, with the Delta strain, starting from December 2020, there have been multiple reports of SPP.

Emergency department management of gastrointestinal foreign body ingestion.

There are over 150,000 reports to American Poison Centers every year due to foreign body ingestions, and many patients will be directed to emergency departments for evaluation and management. This comprehensive review evaluates the current literature related to gastrointestinal foreign body diagnosis and management. A discussion of the utility of various imaging modalities is presented, along with a description of high-risk ingestions and the evidence behind society guidelines and management strategies.

Role of cell-substrate association during plant biomass solubilization by the extreme thermophile Caldicellulosiruptor bescii.

Caldicellulosiruptor species are proficient at solubilizing carbohydrates in lignocellulosic biomass through surface (S)-layer bound and secretomic glycoside hydrolases. Tāpirins, surface-associated, non-catalytic binding proteins in Caldicellulosiruptor species, bind tightly to microcrystalline cellulose, and likely play a key role in natural environments for scavenging scarce carbohydrates in hot springs. However, the question arises: If tāpirin concentration on Caldicellulosiruptor cell walls increased above native levels, would this offer any benefit to lignocellulose carbohydrate hydrolysis and, hence, biomass solubilization? This question was addressed by engineering the genes for tight-binding, non-native tāpirins into C.

Complete Genome Sequences of Two Thermophilic Indigenous Bacteria Isolated from Wheat Straw, Thermoclostridium stercorarium subsp. Strain RKWS1 and sp. Strain RKWS2.

Reported here are complete genome sequences for two anaerobic, thermophilic bacteria isolated from wheat straw, i.e., the (hemi)cellulolytic Thermoclostridium stercorarium subspecies strain RKWS1 (3,029,933 bp) and the hemicellulolytic species strain RKWS2 (2,827,640 bp).

Complete Genome Sequences of Caldicellulosiruptor acetigenus DSM 7040, Caldicellulosiruptor morganii DSM 8990 (RT8.B8), and Caldicellulosiruptor naganoensis DSM 8991 (NA10).

The genome sequences of three extremely thermophilic, lignocellulolytic species were closed, improving previously reported multiple-contig assemblies. All 14 classified spp. now have closed genomes.

Fermentative conversion of unpretreated plant biomass: A thermophilic threshold for indigenous microbial growth.

Naturally occurring, microbial contaminants were found in plant biomasses from common bioenergy crops and agricultural wastes. Unexpectedly, indigenous thermophilic microbes were abundant, raising the question of whether they impact thermophilic consolidated bioprocessing fermentations that convert biomass directly into useful bioproducts. Candidate microbial platforms for biomass conversion, Acetivibrio thermocellus (basionym Clostridium thermocellum; T 60 °C) and Caldicellulosiruptor bescii (T 78 °C), each degraded a wide variety of plant biomasses, but only A.

Treatment-Associated Acute Lymphoblastic Leukemia Following Autologous Hematopoietic Stem Cell Transplant and Lenalidomide Maintenance in Patients With Multiple Myeloma.

Secondary malignancies including leukemia are an increasing concern in patients with prior primary malignancies treated with alkylating agents or topoisomerase II inhibitors. These can also be referred to as therapy-related leukemia. Therapy-related leukemia most commonly results in myelodysplastic syndrome or acute myeloid leukemia.

COVID-19 Delta Variant Co-Infection Mimicking COVID-19 ARDS.

The Delta variant of COVID-19 has been associated with severe disease causing a surge in the second half of 2021. Atypical pathogens can be present in those in particular with severe ARDS and can contribute to excess morbidity and mortality. We must maintain a high level of suspicion for these pathogens as this can present an opportunity to dramatically improve the prognosis of a patient with COVID-19 ARDS.

Biochemical and Regulatory Analyses of Xylanolytic Regulons in Caldicellulosiruptor bescii Reveal Genus-Wide Features of Hemicellulose Utilization.

species scavenge carbohydrates from runoff containing plant biomass that enters hot springs and from grasses that grow in more moderate parts of thermal features. While only a few species can degrade cellulose, all known species are hemicellulolytic. The most well-characterized species, Caldicellulosiruptor bescii, decentralizes its hemicellulase inventory across five different genomic loci and two isolated genes.

Engineering Caldicellulosiruptor bescii with Surface Layer Homology Domain-Linked Glycoside Hydrolases Improves Plant Biomass Solubilization.

Extremely thermophilic species solubilize carbohydrates from lignocellulose through glycoside hydrolases (GHs) that can be extracellular, intracellular, or cell surface layer (S-layer) associated. genomes sequenced so far encode at least one surface layer homology domain glycoside hydrolase (SLH-GH), representing six different classes of these enzymes; these can have multiple binding and catalytic domains. Biochemical characterization of a representative from each class was done to determine their biocatalytic features: four SLH-GHs from Caldicellulosiruptor kronotskyensis (Calkro_0111, Calkro_0402, Calkro_0072, and Calkro_2036) and two from Caldicellulosiruptor hydrothermalis (Calhy_1629 and Calhy_2383).

Hepatitis B Virus Reactivation Following Treatment of HNSCC With Cisplatin.

Hepatitis B Virus (HBV) reactivation is a known complication of intense immunosuppression with B-cell depleting monoclonal antibody therapy and transplantation immunosuppression. HBV reactivation has occurred following treatment with chemotherapy regimens for hematologic malignancies and solid tumors. There are 2 prior case reports of HBV reactivation following cisplatin monotherapy for head and neck squamous cell carcinoma (HNSCC).

Refractory Torsades de Pointes Due to Dofetilide Overdose.

Dofetilide, a class III antiarrhythmic, is widely used in the treatment of cardiac arrhythmias. Antiarrhythmic drugs can have a long duration of action that prolongs the QT interval. This causes bradycardia that predisposes to R-on-T phenomenon subsequently leading to torsades de pointes (TdP).

Genome-Scale Metabolic Model of Reveals Optimal Metabolic Engineering Strategies for Bio-based Chemical Production.

Metabolic modeling was used to examine potential bottlenecks that could be encountered for metabolic engineering of the cellulolytic extreme thermophile Caldicellulosiruptor bescii to produce bio-based chemicals from plant biomass. The model utilizes subsystems-based genome annotation, targeted reconstruction of carbohydrate utilization pathways, and biochemical and physiological experimental validations. Specifically, carbohydrate transport and utilization pathways involving 160 genes and their corresponding functions were incorporated, representing the utilization of C5/C6 monosaccharides, disaccharides, and polysaccharides such as cellulose and xylan.

Transcriptional Regulation of Plant Biomass Degradation and Carbohydrate Utilization Genes in the Extreme Thermophile .

Extremely thermophilic bacteria from the genus can degrade polysaccharide components of plant cell walls and subsequently utilize the constituting mono- and oligosaccharides. Through metabolic engineering, ethanol and other industrially important end products can be produced. Previous experimental studies identified a variety of carbohydrate-active enzymes in model species Caldicellulosiruptor saccharolyticus and Caldicellulosiruptor bescii, while prior transcriptomic experiments identified their putative carbohydrate uptake transporters.

Mitochondria form contact sites with the nucleus to couple prosurvival retrograde response.

Mitochondria drive cellular adaptation to stress by retro-communicating with the nucleus. This process is known as mitochondrial retrograde response (MRR) and is induced by mitochondrial dysfunction. MRR results in the nuclear stabilization of prosurvival transcription factors such as the nuclear factor kappa-light-chain-enhancer of activated B cells (NF-κB).

Evaluation of a novel handheld point-of-care ultrasound device in an African emergency department.

Background: Many point-of-care ultrasound devices are now "pocket-sized" or handheld, allowing easy transport during travel and facilitating use in crowded spaces or in austere low-resource settings. Concerns remain about their durability, image quality, and clinical utility in those environments.

Method: Five emergency physicians with training in point-of-care ultrasound employed the Butterfly iQ, a novel handheld ultrasound device, in routine clinical care in a busy, high-acuity African emergency department over a period of 10 weeks.

An adapted emergency department triage algorithm for the COVID-19 pandemic.

The novel coronavirus disease 2019 (COVID-19) pandemic, with its public health implications, high case fatality rate, and strain on hospital resources, will continue to challenge clinicians and researchers alike for months to come. Accurate triage of patients during the pandemic will assign patients to the appropriate level of care, provide the best care for the maximum number of patients, rationally limit personal protective equipment (PPE) usage, and mitigate nosocomial exposures. The authors describe an adapted COVID-19 pandemic triage algorithm for emergency departments (EDs) guided by the best available evidence and responses to prior pandemics, with recommendations for clinician PPE use for each level of encounter in the setting of an ongoing PPE shortage.

COVID-19: A review of therapeutics under investigation.

The COVID-19 outbreak has disrupted global health care networks and caused thousands of deaths and an international economic downturn. Multiple drugs are being used on patients with COVID-19 based on theoretical and in vitro therapeutic targets. Several of these therapies have been studied, but many have limited evidence behind their use, and clinical trials to evaluate their efficacy are either ongoing or have not yet begun.

Identifying the Contributions of Maternal Factors and Early Childhood Externalizing Behavior on Adolescent Delinquency.

We examined whether childhood externalizing group subtypes were uniquely related to maternal depression and victimization and whether these subtypes differentially predicted adolescent delinquency. Data were drawn from the Longitudinal Study on Child Abuse and Neglect (LONGSCAN) consortium (N = 1091; 51.3% female, 52.

Coronavirus disease 2019: International public health considerations.

On December 31, 2019, the Chinese government announced an outbreak of a novel coronavirus, recently named COVID-19. During the following weeks the international medical community has witnessed with unprecedented coverage the public health response both domestically by the Chinese government, and on an international scale as cases have spread to dozens of countries. While much regarding the virus and the Chinese public health response is still unknown, national and public health institutions globally are preparing for a pandemic.

The biology and biotechnology of the genus Caldicellulosiruptor: recent developments in 'Caldi World'.

Terrestrial hot springs near neutral pH harbor extremely thermophilic bacteria from the genus Caldicellulosiruptor, which utilize the carbohydrates of lignocellulose for growth. These bacteria are technologically important because they produce novel, multi-domain glycoside hydrolases that are prolific at deconstructing microcrystalline cellulose and hemicelluloses found in plant biomass. Among other interesting features, Caldicellulosiruptor species have successfully adapted to bind specifically to lignocellulosic substrates via surface layer homology (SLH) domains associated with glycoside hydrolases and unique binding proteins (tāpirins) present only in these bacteria.

Extreme thermophiles as emerging metabolic engineering platforms.

Going forward, industrial biotechnology must consider non-model metabolic engineering platforms if it is to have maximal impact. This will include microorganisms that natively possess strategic physiological and metabolic features but lack either molecular genetic tools or such tools are rudimentary, requiring further development. If non-model platforms are successfully deployed, new avenues for production of fuels and chemicals from renewable feedstocks or waste materials will emerge.

Parsing in vivo and in vitro contributions to microcrystalline cellulose hydrolysis by multidomain glycoside hydrolases in the Caldicellulosiruptor bescii secretome.

Six multidomain glycoside hydrolases (GHs), CelA (Athe_1867), CelB (Athe_1859), CelC (Athe_1857), CelD (Athe_1866), CelE (Athe_1865), and CelF (Athe_1860) are encoded in the Caldicellulosiruptor bescii glucan degradation locus (GDL). Each GH was affinity-tagged, overexpressed, and purified from recombinant C. bescii for side-by-side characterization in vitro and to examine the contribution of each of these enzymes to microcrystalline cellulose hydrolysis in vivo.