Organ Systems Research Articles

Current options in obesity pharmacotherapy for children and adolescents

Obesity is pervasive from infancy to adulthood and presents a major challenge to healthcare systems worldwide. In children and adolescents, the prevalence of overweight and obesity continues to increase, especially in classes II and III, and in younger toddlers and preschool-aged children. Childhood obesity may be associated with comorbidities in all organ systems and increased cardiovascular risk, as it tracks into adolescent and adult obesity. Although intensive health and behavior lifestyle treatments form the foundation of obesity treatment, there are limitations in the extent and maintenance of weight loss with lifestyle modifications alone. The offering of obesity pharmacotherapy in adjunct to intensive lifestyle treatment in children aged > 12 years may improve outcomes in pediatric obesity. In this review, we discuss currently approved medications for childhood and adolescent obesity, focusing on orlistat, phentermine monotherapy, glucagon-like peptide-1 receptor agonists (liraglutide and semaglutide injections), and phentermine/topiramate combination.

Pulmonary manifestations of VEXAS syndrome with acute interstitial pneumonia and diffuse alveolar hemorrhage: a case report and literature review

Vacuoles, E1 enzyme, X-linked, autoinflammatory, somatic (VEXAS) syndrome is an emerging adult-onset systemic autoinflammatory disorder affecting multiple organ systems. While lung involvement is common in this syndrome, literature regarding specific patterns is sparse. In this report, we present a case description of a patient with VEXAS syndrome who presented at the emergency department on two separate occasions with acute interstitial pneumonia (AIP) and diffuse alveolar hemorrhage (DAH). A literature review with a comparison of our observed findings to the general findings of VEXAS syndrome, AIP, and DAH is provided. This report underscores the rarity of specific pulmonary manifestations associated with VEXAS syndrome, contributing valuable insight to the limited literature available on this topic.

Analysis of Antioxidant Activities, Bioactive Compound Content, and Cytotoxic Effects of Green Oak and Red Oak Lettuce from Hydroponic and Organic Cultivation Systems

Analysis of Antioxidant Activities, Bioactive Compound Content, and Cytotoxic Effects of Green Oak and Red Oak Lettuce from Hydroponic and Organic Cultivation Systems

Further evaluation of a new method to investigate antimicrobial, colour retainment and slice healing properties of cucumber (Cucumis sativus L.) shows differences between conventional and organic production systems in inter-laboratory comparison trials

ABSTRACT Food quality is influenced by different cultivation methods and the type and amount of fertiliser used. The resulting vitality of the food and the ability to resist degradation processes were investigated using a vitality test method, assessing antimicrobial (AMP), colour retainment (CRP) and slice healing properties (SHP) of cucumber fruit (Cucumis sativus L.). Five hundred and sixty-four cucumber samples, grown in greenhouse conditions in Denmark and fertilised with different nitrogen (N) levels, were examined, testing cucumbers from conventional (Conv: 145 g N m−2), organic (OrgN-: 70 g N m−2) and biodynamic (BdN+: 122 g N m−2) cultivation regimes. The experimental design resulted in 54 comparisons consisting of six trial repetitions with three measured parameters examined in three laboratories. Every sample was sliced by a slicing tool, producing alternating slice thickness of 15 and 20 mm. The samples were reassembled, wrapped in transparent plastic foil and stored vertically in a heating cabinet for 14 days in the dark. Subsequently, AMP and CRP were scored visually based on a photo reference series. SHP were examined on the horizontally fixed cucumber sample by attaching weights to two specific slices one after the other until the slices detached. The evaluation of the cucumbers analysed by the vitality test method in inter-laboratory comparison trials led to consistent results. Cucumbers of the OrgN- and BdN+ variants scored higher in the test than Conv. It was not possible to differentiate OrgN- vs. BdN+ cucumbers. The vitality test is an attractive method for evaluating post-harvest resilience in cucumbers.

Effect of different nutrient management practices on productivity, profitability and nutrient dynamics in forage-based cropping systems under mid-hill conditions of north-western Himalayas

A field experiment was conducted at the research farm of Fodder Section, CSKHPKV, Palampur, from Kharif 2018 to Rabi 2019-20 to study the effect of different nutrient management practices in forage-based cropping systems. Ten nutrient management practices in two cropping systems were tested in randomized block design with three replications. Integrated nutrient management, i.e., 50% recommended N + 10 t/ha FYM + 10% Jeevamrit and 50% recommended N+ 10 t/ha FYM + 5% Jeevamrit and recommended NPK behaving alike resulted in higher oat green fodder equivalent yield, nutrient uptake (N, P and K) and system productivity of sorghum + pearl millet - oat + sarson/wheat cropping systems. An increase in soil organic carbon content was observed with integrated nutrient management (50% recommended N + 10 t/ha FYM + Jeevamrit) and organic nutrient management (10 t/ha FYM + Jeevamrit) over the initial status at the end of sorghum + pearl millet - oat + sarson/wheat cropping systems. Integrated nutrient management improved available soil nitrogen, phosphorus and potassium contents over the initial values. Significantly higher available soil nitrogen, phosphorus and potassium contents were recorded with integrated nutrient management as well as with recommended NPK through inorganic sources over other treatments comprised of organic and natural farming systems of nutrition in both the cropping systems. Recommended NPK proved most profitable with the highest net returns and benefit-cost ratio in sorghum + pearl millet - oat + sarson/wheat cropping systems. Sorghum + pearl millet - oat + sarson cropping system comprised of all fodder crops resulted in higher productivity and profitability but did not increase soil available nutrient status as compared to sorghum + pearl millet - wheat cropping system comprised of fodder as well as grain crops.

The genetic architecture of biological age in nine human organ systems.

Investigating the genetic underpinnings of human aging is essential for unraveling the etiology of and developing actionable therapies for chronic diseases. Here, we characterize the genetic architecture of the biological age gap (BAG; the difference between machine learning-predicted age and chronological age) across nine human organ systems in 377,028 participants of European ancestry from the UK Biobank. The BAGs were computed using cross-validated support vector machines, incorporating imaging, physical traits and physiological measures. We identify 393 genomic loci-BAG pairs (P < 5 × 10-8) linked to the brain, eye, cardiovascular, hepatic, immune, metabolic, musculoskeletal, pulmonary and renal systems. Genetic variants associated with the nine BAGs are predominantly specific to the respective organ system (organ specificity) while exerting pleiotropic links with other organ systems (interorgan cross-talk). We find that genetic correlation between the nine BAGs mirrors their phenotypic correlation. Further, a multiorgan causal network established from two-sample Mendelian randomization and latent causal variance models revealed potential causality between chronic diseases (for example, Alzheimer's disease and diabetes), modifiable lifestyle factors (for example, sleep duration and body weight) and multiple BAGs. Our results illustrate the potential for improving human organ health via a multiorgan network, including lifestyle interventions and drug repurposing strategies.

Harnessing Soil Diversity: Innovative Strategies for Potato Blight Management in Central-Eastern Poland

Faced with increasing climate challenges, this pioneering study introduces groundbreaking approaches to ensure the resilience of potato crops in east-central Poland. Our research was aimed at developing an innovative, cost-effective system tailored to the diverse local conditions of this region. Conducted between 2018 and 2020, the study analyzed integrated and organic production systems across different soil types and potato varieties. The experiment was conducted using a randomized block design with three replications in two locations. Integrated production systems involve the strategic use of mineral fertilization and chemical protection to optimize crop growth and health, whereas organic production systems rely solely on natural inputs and biological pest control methods. Integrated practices, enhanced by mineral fertilization and chemical protection, notably delayed the onset of late blight by 16 days and extended the critical infection period by 17% compared to their organic counterparts. Remarkably, the integrated systems resulted in a 49% increase in total production and a 52% increase in commercial yields, demonstrating their effectiveness in enhancing crop resilience. Different potato varieties exhibit varied responses to cultivation systems, influencing both yield and disease resistance. Further investigation into these varietal responses can help optimize cultivation practices, leading to improved efficiency and sustainability in potato farming. Location and soil conditions have a significant impact on potato yield and the spread of potato blight. Specific soil properties such as pH levels, organic matter content, soil texture (clay, silt, and sand composition), moisture retention capacity, and nutrient availability are crucial in determining potato productivity and disease dynamics. Further research into these soil properties and the adaptation of varieties to local conditions can contribute to increased productivity and stability in potato production. This study not only paves the way toward sustainable agriculture but also highlights the crucial role of soil diversity in shaping resilient farming practices. Potato producers in the eastern-central region of Poland should implement integrated production systems using mineral fertilization and chemical plant protection, adapted to local soil conditions and potato varieties. These practices can delay the appearance of late blight and increase the total and marketable potato yield. Further research on soil properties and variety adaptation may increase production stability and efficiency. Promoting soil diversity and modern technologies will ensure resilient and sustainable agricultural production in the face of climate change.

Nanostructure-Mediated Transport of Therapeutics through Epithelial Barriers.

The ability to precisely treat human disease is facilitated by the sophisticated design of pharmacologic agents. Nanotechnology has emerged as a valuable approach to creating vehicles that can specifically target organ systems, effectively traverse epithelial barriers, and protect agents from premature degradation. In this review, we discuss the molecular basis for epithelial barrier function, focusing on tight junctions, and describe different pathways that drugs can use to cross barrier-forming tissue, including the paracellular route and transcytosis. Unique features of drug delivery applied to different organ systems are addressed: transdermal, ocular, pulmonary, and oral delivery. We also discuss how design elements of different nanoscale systems, such as composition and nanostructured architecture, can be used to specifically enhance transepithelial delivery. The ability to tailor nanoscale drug delivery vehicles to leverage epithelial barrier biology is an emerging theme in the pursuit of facilitating the efficacious delivery of pharmacologic agents.

Character and Frequency of the Syntropic Extrahepatic Lesions in Cirrhotic Patients with Hepatopulmonary Syndrome of Various Severity Degree

Introduction. All over the world, and in Ukraine in particular, the incidence of liver diseases is constantly increasing. By practicing the most effective individualized appointment of complex treatment, it should be taken into consideration the involvement of different organ systems to the pathological processes of the cirrhotic patients, which we define as syntropic polymorbid lesions. The aim of the study. To determine the frequency and character of syntropic extrahepatic lesions in cirrhotic patients depending on the hepatopulmonary syndrome severity degree. Materials and methods. In a randomized manner with preliminary stratification by the presence of hepatopulmonary syndrome were studied 93 patients with liver cirrhosis, who underwent the comprehensive clinical-laboratory and instrumental examination. Results. According to the obtained results, most often in patients with liver cirrhosis associated with hepatopulmonary syndrome syntropic extrahepatic lesions affected other organ systems as follows: digestive system - 100.0 % patients under investigation; hematopoietic system - 84.9 %; nervous system - 81.7 %; integumentary system and mucous membranes - 78.5 %; blood circulatory system - 76. 3%;osteoarticular system - 67.7 %; urinary system - 22.6 %. Increased severity of hepatopulmonary syndrome significantly (p &lt; 0.05) correlated with thein creased frequency of lesions. Among syntropic polymorbid lesions of the integumentary system and mucous membranes, 68.8 % patients with hepatopulmonary syndrome had jaundice, 66.7 % - telangiectasia. Among lesions of the osteoarticular system osteopenia was diagnosed in 44.7 % of patients, osteoporosis - in 27.7 %. Among lesions of the circulatory system 52.7% of patients suffered from heart rhythm disorders, 49.5 % - from arterial hypotension, 20.4 % - from cirrhotic cardiomyopathy. Among lesions of the hematopoietic system anemia (76.3 %), coagulopathy (73.1 %) and thrombocytopenia (61.3 %) were diagnosed most often. Digestive system lesionsinclude esophageal veins varicosities (94.6 % of patients), hemorrhoidal veins varicosites (68.8 %), and cirrhotic gastropathy (62.4 %). Among lesions of the urinary systemin 21.5 % of patientswas diagnosed type II hepatorenal syndrome. Among the lesions of central nervous system in 81.7 % of patientswas diagnosed hepatic encephalopathy. The frequency of syndromes and nosological units increased significantly (p &lt; 0.05) with the increase of hepatopulmonary syndrome severity. Conclusions. 100.0 % patients with liver cirrhosis accompanied byhepatopulmonary syndromewere affected by syntropic polymorbid lesionsof the digestive system, 94.6 % of which were represented by esophageal vein varicosites. Out of 84.9 % of patients with hematopoietic lesions anemia was diagnosed in 76.3 %, coagulopathy - in 73.1 % of cases. Of total 81.7 % patients withnervous system injurieshepatic encephalopathy was diagnosed in 81.7 % patients. In 78.5 % cases of damaged skin, its appendages and mucous membranesjaundice covered 68.8 %, and telangiectasia 66.7 % of cases. In 76.3 % of cardiovascular system lesions arrhythmias were diagnosed in 52.7 %.With the increasing severity of hepatopulmonary syndrome, the frequency of the above lesions increased significantly (p &lt; 0.05).

Bridging the Gap: Integrating 3D Bioprinting and Microfluidics for Advanced Multi-Organ Models in Biomedical Research.

Recent advancements in 3D bioprinting and microfluidic lab-on-chip systems offer promising solutions to the limitations of traditional animal models in biomedical research. Three-dimensional bioprinting enables the creation of complex, patient-specific tissue models that mimic human physiology more accurately than animal models. These 3D bioprinted tissues, when integrated with microfluidic systems, can replicate the dynamic environment of the human body, allowing for the development of multi-organ models. This integration facilitates more precise drug screening and personalized therapy development by simulating interactions between different organ systems. Such innovations not only improve predictive accuracy but also address ethical concerns associated with animal testing, aligning with the three Rs principle. Future directions include enhancing bioprinting resolution, developing advanced bioinks, and incorporating AI for optimized system design. These technologies hold the potential to revolutionize drug development, regenerative medicine, and disease modeling, leading to more effective, personalized, and humane treatments.

Foliar application of various biostimulants produces contrasting response on yield, essential oil and chemical properties of organically grown sage (Salvia officinalis L.).

Sage (Salvia officinalis L.) is a medicinal and aromatic plant (MAP) belonging to the Lamiaceae family. Its morphological, productive and chemical characteristics are affected by abiotic and biotic factors. The use of biostimulants seems to be one of the most interesting innovative practices due to fact they can represent a promising approach for achieving sustainable and organic agriculture. Despite a large application in horticulture, the use of biostimulants on MAPs has been poorly investigated. On this basis, a field experiment in a 2-year study was done to assess the effect of foliar treatments with different types of biostimulants (containing seaweeds, fulvic acids and protein hydrolysates) and two frequencies of application on morphological, productive, and chemical characteristics of S. officinalis grown organically in Mediterranean environment. Morphological, productive, and chemical parameters were affected by the factors. The biostimulant application generated higher plant height, chlorophyll content, relative water content, biomass yield and essential oil yield compared to control plants. In addition, more frequent application of biostimulants produced higher biomass and essential oil yield. The application of fulvic acid and protein hydrolysates every week produced the highest total fresh yields (between 3.9 and 8.7 t ha-1) and total dry yields (between 1.3 and 2.5 t ha-1). The essential oil yield almost doubled (33.9 kg ha-1) with a higher frequency of protein hydrolysates application. In this study, 44 essential oil compounds were identified, and the frequency factor significantly influenced the percentage of 38 compounds. The highest percentage of some of the most representative monoterpenes, such as 1,8-cineole, α-thujone and camphor, were observed in biostimulated plants, with average increases between 6% and 35% compared to control plants. The highest values for total phenolics, rosmarinic acid, antioxidant activity were obtained in control plants and with a lower frequency of biostimulant applications. This study emphasizes how biostimulant applications may be used to improve sage production performance and essential oil parameters when produced in agricultural organic system. At the same time, biostimulants application caused a decrease in total phenolic, antioxidant activity and rosmarinic acid values.

Substance P receptor signaling contributes to host maladaptive responses during enteric bacterial infection.

Immune responses in the intestine are intricately balanced to prevent pathogen entry without inducing immunopathology. The nervous system is well-established to interface with the immune system to fine-tune immunity in various organ systems including the gastrointestinal tract. Specialized sensory neurons can detect bacteria, bacterial products, and the resulting inflammation, to coordinate the immune response in the gastrointestinal tract. These sensory neurons release peptide neurotransmitters such as Substance P (SP), to induce both neuronal signaling and localized responses in non-neuronal cells. With this in mind, we assessed the immunoregulatory roles of SP receptor signaling during enteric bacterial infection with the non-invasive pathogen Citrobacter rodentium. Pharmacological antagonism of the SP receptor significantly reduced bacterial burden and prevented colonic crypt hyperplasia. Mice with SP receptor signaling blockade had significantly reduced inflammation and recruitment of T-cells in the colon. Reduced colonic T-cell recruitment is due to reduced expression of adhesion molecules on colonic endothelial cells in SP receptor antagonist-treated mice. Using SP receptor T-cell conditional knockout mice, we further confirmed SP receptor signaling enhanced select aspects of T-cell responses. Our data demonstrates that SP receptor signaling can significantly reduce inflammation and prevent host-maladaptive responses without impinging upon host protection.

Lyso-H2S: A Mycophenolic Acid-Derived Probe for Ultra-Low Toxicity, Intracellular H2S Detection, and Zebrafish Model Validation.

In several biological processes, H2S is known to function as an endogenous gaseous agent. It is very necessary to monitor H2S and relevant physiological processes in vivo. Herein, a new type of fluorophore with a reliable leaving group allows for excited-state intramolecular transfer characteristics (ESIPT), inspired by mycophenolic acid. A morpholine ring was connected at the maleimide position to target the lysosome. Subsequently, the dinitrophenyl group known for a photoinduced electron transfer (PET) effect, was connected to allow for an effective "turn-on" probe Lyso-H2S. Lyso-H2S demonstrated strong selectivity towards H2S, large Stokes shift (111 nm), and an incredibly low detection limit (41.8 nM). The imaging of endogenous and exogenous H2S in living cells (A549 cell line) was successfully achieved because of the specificity and ultra-low toxicity (100 % cell viability at 50 µM concentration of Lyso-H2S.) Additionally, Lyso-H2S was also employed to visualize the activity of H2S in the gallbladder and intestine in a living zebrafish model. This is the first report of a fluorescent probe to track H2S sensing in specific organ systems to our knowledge.

Prevalence of pain-related presentations in Canadian pediatric emergency departments.

Pain is a common reason for attendance to the emergency department; however, pediatric specific data on the prevalence, location, and etiology of painful presentations are limited in the literature. Therefore, the objective of this study was to determine the prevalence of pain-related presentations to pediatric emergency departments during the triage process and characterize the anatomical locations and organ systems most affected by pain in a modern cohort. A two-center health record review of triage documentation was conducted at Canadian pediatric emergency departments. All children (< 18years) were eligible for inclusion. Data were extracted from administrative sources with one week of consecutive patients included every 3months over a one-year timeframe. Regression analyses were completed to identify variables associated with painful presentations and analgesia provision during the triage process. A total of 7208 emergency department presentations were included. Median [IQR] child age was 5.2 [1.9, 11.8] years and 53.2% were male. 58.8% of children were found to have pain as a component of their triage presentation. Of those with pain (n = 4237), 24.1% had a pain score documented and 13.8% had analgesia provided at triage. Location of pain (n = 4523) was predominantly in the head (38.0%), extremities (27.8%), and abdomen (22.8%). Primary organ systems most affected (n = 4237) included the musculoskeletal (31.1%), gastrointestinal (18.3%), and cutaneous (including lacerations) (14.4%) systems. In this study, pain was identified in almost 60% of all pediatric emergency department presentations at the time of triage. Suboptimal documentation of pain scores and provision of analgesia at triage were found for children with pain. These results support early assessment and implementation of pain management strategies at triage. Results can also focus further research efforts to the management of the most commonly presenting types of pediatric pain.

Multiple immune-related adverse events secondary to checkpoint inhibitor therapy in patients with advanced cancer: association with treatment effectiveness.

Checkpoint inhibitors (CPI) are widely used in cancer treatment with a potential of causing immune-related adverse events (IRAEs). Several studies have reported a positive correlation between development of IRAEs and improved survival outcome. However, few studies have focused on the potential role of multiple IRAEs on treatment effectiveness. This study aimed at investigating the association between multiple IRAEs and treatment effectiveness in terms of progression-free survival (PFS) and overall survival (OS) in advanced cancer patients. We performed a retrospective cohort study at three Swedish centers. All patients (n=600) treated with PD-L1 or PD-1 inhibitor, in monotherapy or in combination for advanced cancer between January 2017 and December 2021 were included. Multiple IRAEs were defined as IRAEs involving more than one organ system either simultaneously or sequentially. Time-depending Cox-regression model to mitigate the risk for immortal time bias (ITB) was applied. The major tumor types were non-small cell lung cancer (205 patients; 34.2%) and malignant melanoma (196 patients; 32.7%). Of all patients,32.8% developed single IRAE and 16.2% multiple IRAEs. Patients with multiple IRAEs showed significantly improved PFS (Hazard Ratio, HR=0.78 95% Confidence Interval, CI: 0.57-0.98) and OS (HR=0.65 95% CI: 0.44-0.95) compared to patients with single IRAE or no IRAE (HR=0.46 95% CI:0.34-0.62 for PFS vs HR=0.41 95% CI: 0.28-0.60 for OS). In conclusion, our data supports a stronger association between development of multiple as opposed to single IRAEs and clinical effectiveness in advanced cancer patients treated with CPIs.

Initial Clinical Presentation of Systematic Lupus Erythematosus (SLE) Patients in Cipto Mangunkusumo Hospital

Background. Systemic Lupus Erythematosus (SLE) is a systemic autoimmune disease characterized by highly diverse and nonspecific symptoms with clinical presentations involving more than one organ system which often leads to delayed diagnosis and poor prognosis. This study aims to understand patients’ initial clinical presentation in order to enhance early detection and establish an early diagnosis. Methods. This descriptive cross-sectional quantitative study included patients who commenced their visits to the Rheumatology Clinic at RSCM from May 2021-December 2022. A consecutive sampling method was used, and data were analyzed for age, gender, symptom onset, as well as patients' initial clinical presentations (SPSS 25.0). Results. Out of 231 subjects, 96.1% were females. A total of 38.1% of the patients belonged to the 21-30 age group, and symptom onset was most commonly observed in the 0-1 year age group, accounting for 67.5%. Approximately 24.2% of the patients exhibited constitutional manifestations with involvement of other organs, including musculoskeletal (87.4%), mucocutaneous (84%), hematologic (3.,5%), renal (33.3%), and neuropsychiatric (8.7%) systems. Lungs, heart, blood vessels, gastrointestinal and hepatic systems, eyes, obstetric, and endocrine involvements were not found in this study. Among the 231 subjects, 44.2% of them had simultaneous involvement of two organs, which emerged as their initial clinical presentation. Conclusion. Musculoskeletal and mucocutaneous involvement were most commonly observed as the initial clinical presentation of SLE patients at RSCM, followed by hematologic, renal, and neuropsychiatric involvement.

Gap-junction-mediated bioelectric signaling required for slow muscle development and function in zebrafish

Bioelectric signaling, intercellular communication facilitated by membrane potential and electrochemical coupling, is emerging as a key regulator of animal development. Gap junction (GJ) channels can mediate bioelectric signaling by creating a fast, direct pathway between cells for the movement of ions and other small molecules. In vertebrates, GJ channels are formed by a highly conserved transmembrane protein family called the connexins. The connexin gene family is large and complex, creating challenges in identifying specific connexins that create channels within developing and mature tissues. Using the embryonic zebrafish neuromuscular system as a model, we identify a connexin conserved across vertebrate lineages, gjd4, which encodes the Cx46.8 protein, that mediates bioelectric signaling required for slow muscle development and function. Through mutant analysis and invivo imaging, we show that gjd4/Cx46.8 creates GJ channels specifically in developing slow muscle cells. Using genetics, pharmacology, and calcium imaging, we find that spinal-cord-generated neural activity is transmitted to developing slow muscle cells, and synchronized activity spreads via gjd4/Cx46.8 GJ channels. Finally, we show that bioelectrical signal propagation within the developing neuromuscular system is required for appropriate myofiber organization and that disruption leads to defects in behavior. Our work reveals a molecular basis for GJ communication among developing muscle cells and reveals how perturbations to bioelectric signaling in the neuromuscular system may contribute to developmental myopathies. Moreover, this work underscores a critical motif of signal propagation between organ systems and highlights the pivotal role of GJ communication in coordinating bioelectric signaling during development.

Analysis of Liquid Air Energy Storage System with Organic Rankine Cycle and Heat Regeneration System

Liquid air energy storage (LAES) is one of the most promising technologies for power generation and storage, enabling power generation during peak hours. This article presents the results of a study of a new type of LAES, taking into account thermal and electrical loads. The following three variants of the scheme are being considered: with single-stage air compression and the use of compression heat for regasification (Case 1); with single-stage compression and the organic Rankine cycle (Case 2); and with three-stage air compression/expansion and the organic Rankine cycle (Case 3). To analyze the proposed schemes, the Aspen HYSYS v.12 software package was used to compile models of the studied cycles. The analysis shows that round-trip efficiency (RTE) can be as high as 54%. The cost of 1 kg of liquid air is USD 7–8. Moreover, it is shown that the generation of electrical energy largely depends on the operation of the expander plant, followed by the organic Rankine cycle (ORC).

Tillage and crop sequences for organic Cirsium arvense management in the Northern Great Plains

AbstractThe perennial rhizomatous weed Cirsium arvense (L.) Scop. is difficult to manage on semiarid organic farms. Our objective was to quantify the impact of eight 4‐year crop sequences crossed with standard‐ and reduced‐tillage on C. arvense occurrence (presence/absence), stem density, and aboveground biomass at two semiarid sites in Montana. The sequences represented a range of crop competition from high (multiple years of perennial forage [alfalfa, Medicago sativa L.]) to low (2 years of continuous fallow), with intermediate sequences consisting of different annual species. Final‐year spring wheat (Triticum aestivum L. emend. Thell.) was planted in all sequences to determine impacts on subsequent cash crop production. Through time, alfalfa and double fallow sequences reduced C. arvense density and biomass where it was established, although its invasion into new areas increased in the double fallow. Final‐year C. arvense occurrence and stem density were lower in the alfalfa sequence compared with six and four annual crop sequences, respectively (p &lt; 0.05). Final year C. arvense biomass was higher at one site than the other, although not in the double fallow sequence. Wheat grain yields differed in response to crop sequences at the two sites: at one site, grain yield was lowest in the alfalfa sequence, especially when standard‐tillage was used, while yields were highest in the alfalfa and double fallow sequences at the other site. Using perennial forages in semiarid organic systems can be effective for managing C. arvense, but subsequent cash crop yield may be depressed.

A complex relationship between cropping systems and soil macrofauna: Influence of practice intensity, taxa and traits

Larger soil organisms have often been reported as the most sensitive to disturbances caused by cropping practices. However, soil macrofauna comprises groups with a wide diversity of morphological and ecological features, which may respond differently to applied practices. In order to further assess the effect of cropping systems on soil macrofauna, macrofauna organisms were extracted from soil blocks over 21 fields (each comprising three plots) located in the Paris basin, in autumns 2020 and 2021. Fields belonged to conventional, conservation or organic systems, either long-established (≥ 7 years) or in transition (≤ 3 years). Tillage, pesticide treatment and organic matter input intensity were assessed in each field using composite indexes of practice intensity. Macrofauna density and diversity, earthworm ecological categories, species richness and functional traits were investigated. Our results showed that the density and diversity of macrofauna demonstrated few differences regarding different cropping systems, with highly variable effects across groups and years. Specific macroarthropod groups responded differently to tillage, pesticide treatment and organic input intensity, but not over the two years of the study. Regarding earthworms, high tillage intensity had a negative effect on the density and biomass of epi-anecic juveniles and on species with a small body size. Higher organic matter inputs had a negative effect on the density and biomass of endogeic earthworms, and could be related to several earthworm functional traits (body length, mass/length ratio, carbon preferences). Effects of pesticide treatments were less clear, although they could have impacted some earthworm species. More generally, taxonomic and functional trait approaches of earthworm community led to similar conclusions. Overall, our results support the need to account for (i) the actual intensity of practices in cropping systems and (ii) the different taxonomic, trophic and ecological groups of macrofauna, in order to assess the effects of cropping systems on soil biodiversity.