Continental diatom biodiversity discovery and description in China: 1848 through 2019

In this paper we inventory the continental diatom taxa described from inland waters in China, from the first species descriptions dating back to 1848 through 2019. China’s geography and hydrography are complex, including the world’s highest mountains, many large rivers, salty lakes, and large karst regions. From this area, a total of 1128 taxa have been described from China over this time period. We examine the number of taxa described in ca. 20-year intervals and note the periods of time of no to few descriptions, versus time intervals with many taxon descriptions. Early on, taxon descriptions of freshwater diatoms from China were done by mostly by Europeans working alone, and the time frame of 1948 to 1967 had few descriptions, as a devasting famine and the cultural revolution impacted scientific work and productivity. B.V. Skvortzov produced a large number of taxon descriptions, during his time in residence in Harbin, later while in Sao Paulo, Brazil, and even posthumously. More recently, a wide range of labs and collaborations across China, and with a diverse array of international partners, is ushering in a new, robust era of research on the biodiversity of continental diatoms. A few areas of research and work for the future are discussed.

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Design of a high-stability heterogeneous clock system for small satellites in LEO

GPS Solutions ◽

10.1007/s10291-021-01134-x ◽

2021 ◽

Vol 25 (3) ◽

Author(s):

Damon Van Buren ◽

Penina Axelrad ◽

Scott Palo

Keyword(s):

Low Power ◽

High Stability ◽

Time Frame ◽

System Stability ◽

Small Satellite ◽

Crystal Oscillator ◽

Small Satellites ◽

Clock System ◽

Wide Range

AbstractWe describe our investigation into the performance of low-power heterogeneous timing systems for small satellites, using real GPS observables from the GRACE Follow-On mission. Small satellites have become capable platforms for a wide range of commercial, scientific and defense missions, but they are still unable to meet the needs of missions that require precise timing, on the order of a few nanoseconds. Improved low-power onboard clocks would make small satellites a viable option for even more missions, enabling radio aperture interferometry, improved radio occultation measurements, high altitude GPS navigation, and GPS augmentation missions, among others. One approach for providing improved small satellite timekeeping is to combine a heterogeneous group of oscillators, each of which provides the best stability over a different time frame. A hardware architecture that uses a single-crystal oscillator, one or more Chip Scale Atomic Clocks (CSACs) and the reference time from a GPS receiver is presented. The clocks each contribute stability over a subset of timeframes, resulting in excellent overall system stability for timeframes ranging from less than a second to several days. A Kalman filter is used to estimate the long-term errors of the CSACs based on the CSAC-GPS time difference, and the improved CSAC time is used to discipline the crystal oscillator, which provides the high-stability reference clock for the small satellite. Simulations using GRACE-FO observations show time error standard deviations for the system range from 2.3 ns down to 1.3 ns for the clock system, depending on how many CSACs are used. The results provide insight into the timing performance which could be achieved on small LEO spacecraft by a low power timing system.

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Breeding Strategies to Improve Miscanthus as a Sustainable Source of Biomass for Bioenergy and Biorenewable Products

Agronomy ◽

10.3390/agronomy9110673 ◽

2019 ◽

Vol 9 (11) ◽

pp. 673 ◽

Cited By ~ 7

Author(s):

John Clifton-Brown ◽

Kai-Uwe Schwarz ◽

Danny Awty-Carroll ◽

Antonella Iurato ◽

Heike Meyer ◽

...

Keyword(s):

Significant Contribution ◽

Perennial Grass ◽

Time Frame ◽

Eastern Asia ◽

Germplasm Collections ◽

Naturally Occurring ◽

Wide Range ◽

Yield Quality ◽

Short Time ◽

Commercial Expansion

Miscanthus, a C4 perennial grass native to Eastern Asia, is being bred to provide biomass for bioenergy and biorenewable products. Commercial expansion with the clonal hybrid M. × giganteus is limited by low multiplication rates, high establishment costs and drought sensitivity. These limitations can be overcome by breeding more resilient Miscanthus hybrids propagated by seed. Naturally occurring fast growing indigenous Miscanthus species are found in diverse environments across Eastern Asia. The natural diversity provides for plant breeders, the genetic resources to improve yield, quality, and resilience for a wide range of climates and adverse abiotic stresses. The challenge for Miscanthus breeding is to harness the diversity through selections of outstanding wild types, parents, and progenies over a short time frame to deploy hybrids that make a significant contribution to a world less dependent on fossil resources. Here are described the strategies taken by the Miscanthus breeding programme at Aberystwyth, UK and its partners. The programme built up one of the largest Miscanthus germplasm collections outside Asia. We describe the initial strategies to exploit the available genetic diversity to develop varieties. We illustrate the success of combining diverse Miscanthus germplasm and the selection criteria applied across different environments to identify promising hybrids and to develop these into commercial varieties. We discuss the potential for molecular selections to streamline the breeding process.

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On the distribution of the number of cyclically occurring random events

Journal of Applied Probability ◽

10.2307/3212338 ◽

1972 ◽

Vol 9 (3) ◽

pp. 681-683

Author(s):

Leon Podkaminer

Keyword(s):

Random Variables ◽

Independent Random Variables ◽

Time Intervals ◽

Time Period ◽

Random Events ◽

Mutually Independent

The probabilities of the occurrence of n events in a certain time period are calculated under the assumptions that the time intervals between the neighbouring events are mutually independent random variables, satisfying some analytic conditions.

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Thoracic Surgery during Coronavirus Disease 2019 (COVID-19): The Experience of a Level 1 Trauma Center

The Thoracic and Cardiovascular Surgeon ◽

10.1055/s-0040-1718938 ◽

2020 ◽

Author(s):

Jeremy Smelt ◽

Gowthanan Santhirakumaran ◽

Paul Vaughan ◽

Ian Hunt ◽

Carol Tan

Keyword(s):

Thoracic Surgery ◽

Trauma Center ◽

Time Frame ◽

World Health ◽

Global Pandemic ◽

Trauma Service ◽

Time Period ◽

Novel Coronavirus ◽

Health Organization ◽

Level 1 Trauma Center

Abstract Background Severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), a novel coronavirus primarily affecting the respiratory system, was initially diagnosed in Wuhan, China, in late 2019. Identified as coronavirus disease 2019 (COVID-19) by the World Health Organization, the virus rapidly became a global pandemic. The effects on health care worldwide were unprecedented as countries adapted services to treat masses of critically ill patients.The aim of this study is to analyze the effect that the COVID-19 pandemic had on thoracic surgery at a major trauma center during peak prevalence. Methods Prospective unit data were collected for all patients who underwent thoracic surgery during March 2020 until May 2020 inclusive. Retrospective data were collected from an earlier comparable time period as a comparison. Results In the aforementioned time frame, 117 thoracic surgical operations were performed under the care of four thoracic surgeons. Six operations were performed on three patients who were being treated for SARS-CoV-2. One operation was performed on a patient who had recovered from SARS-CoV-2. There were no deaths due to SARS-CoV-2 in any patient undergoing thoracic surgery. Conclusion This study demonstrates that during the first surge of SARS-CoV-2, it was possible to adapt a thoracic oncology and trauma service without increase in mortality due to COVID-19. This was only possible due to a significant reduction in trauma referrals, cessation of benign and elective work, and the more stringent reprioritization of cancer surgery. This information is vital to learn from our experience and prepare for the predicted second surge and any similar future pandemics we might face.

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Technology of production of biopesticides based on Bacillus thuringiensis

FOOD RESOURCES ◽

10.31073/foodresources2021-16-03 ◽

2021 ◽

Vol 9 (16) ◽

pp. 28-38

Author(s):

Anatolii Bezusov ◽

◽

Valentyna Krutiakova ◽

Olena Myroshnichenko ◽

Nataliia Dotsenko ◽

...

Keyword(s):

Bacillus Thuringiensis ◽

Corn Oil ◽

Raw Materials ◽

Culture Fluid ◽

Scientific Work ◽

Insect Larvae ◽

Effective Prevention ◽

Research Results ◽

Wide Range ◽

Vegetable Raw Materials

Subject of research. Biopesticides are based on live cultures of specially selected beneficial microorganisms with controlled properties. They have a pronounced phytoprotective and stimulating effect, thus providing effective prevention and protection of plants from diseases. The obtained biological product increases productivity, improves the quality and structure of the crop, does not accumulate in plants, which allows to obtain environmentally friendly agricultural products and does not harm the environment. Among the large number of bacteria, as a source of microbiological insecticide is Bacillus thuringiensis, which infects lepidopteran pests and leads to their death. Preparations based on this strain are effective when used in low concentrations of solutions. The Bacillus thuringiensis strain produces several toxins with insecticidal action, including β-exotoxin and δ-endotoxin. Toxic effect is manifested and leads to paralysis of the intestinal tract of parasites. Preparations β-exotoxin and δ-endotoxin are obtained by culturing Bacillus thuringiensis bacteria in a liquid medium. The scientific work proposes a method of industrial production using by-products of vegetable raw materials, which makes it economically feasible to use such substrates. The purpose of the study is the development of technology, formulation of nutrient medium, process parameters for the cultivation of bacteria of the genus Bacillus thuringiensis and obtaining a culture fluid containing substances of the class of biopesticides. Methods. Standard and generally accepted methods of research of bioproducts in biotechnology. The formation of bioinsecticides was established by hydrolysis methods, followed by determination of the component of β-exotoxin – ribose, the formation of octagonal crystals of exotoxin – by microscopic method. Research results. Three variants of nutrient media, which include yeast-polysaccharide complex: corn flour, corn oil, yeast autolysate were developed. The parameters of the bacterial cultivation process were studied. The final product is a paste or powder with a titer of 35 .109 spores in 1 g of the bioproduct. Scope of research results. Microbiological preparations based on Bacillus thuringiensis are highly specific and act only on insect larvae from the classes Lepidoptera and Diptera. The resulting biopesticide can be used against pests of a wide range of vegetable and fruit crops.

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Welcome to the Ziggurat Journal of Materials Technology - a New Open Access Journal

Ziggurat Journal of Materials Technology (ZJMT) ◽

10.36533/zjmt.v1i1.108 ◽

2020 ◽

Vol 1 (1) ◽

Author(s):

Jürgen Bast

Keyword(s):

Urban Areas ◽

Technological Progress ◽

High Stress ◽

Scientific Work ◽

Open Access Journal ◽

Human Society ◽

New Materials ◽

Wide Range ◽

Global Population

Dear readers, authors and colleagues, Technological progress plays an essential role in the development of human society. The increasing global population and its mobility, the expansion of urban areas, climate protection and the conservation of fossil resources present challenges that can only be overcome by the improvement of existing resources and the development of new components, materials and production processes. Conventional materials have quickly reached their limit as new mechanisms are developed. These fields of application require the supply of new materials working in aggressive environments at extreme temperatures and high stress. These new materials are also expected to automatically alert us when critical loads are reached to avoid accidents caused by failures. This is the first issue of the Ziggurat Journal of Materials Technology, and we hope that you are satisfied with the content. The title of the journal primarily suggests materials technology; however, we strive to present a broad range of topics, including questions about the interaction between design, material, manufacturing and energy. The efficient interaction between these parameters results in components that are optimally designed and economically feasible. The idea for this journal resulted from the editors' realisation of the large knowledge potential that is being developed at colleges and universities around the world by scholars and PhD students. These clients must have the opportunity to publish their work and get in touch with other scientists. We want to reach out to young researchers and encourage them to present their work to a wide range of readers. Furthermore, a scientific career today requires evidence of publications that withstand the corresponding assessments of specialist colleagues and meet the criteria of good scientific work. In this context, the submitted articles will be subjected to a strict review. The principal objective is not to criticise work but rather to provide advice on how to improve the quality of the work presented. With this in mind, we would like to invite you to submit articles and use this journal as a reference for your ongoing scientific work.

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Analytical and diagnostic performances of a high-throughput immunoassay for SARS-CoV-2 IgM and IgG

10.1101/2020.11.20.20235267 ◽

2020 ◽

Author(s):

Andrea Padoan ◽

Chiara Cosma ◽

Paolo Zaupa ◽

Mario Plebani

Keyword(s):

Sensitivity And Specificity ◽

Symptom Onset ◽

Severe Disease ◽

Onset Time ◽

Time Frame ◽

Serum Samples ◽

Time Period ◽

Analytical Imprecision ◽

Range Of Values

BackgroundAbstractReliable SARS-CoV-2 serological assays are required for diagnosing infections, for the serosurveillance of past exposures and for assessing the response to future vaccines. In this study, the analytical and clinical performances of a chemiluminescent immunoassays for SARS-CoV-2 IgM and IgG detection (Mindray CL-1200i), targeting Nucleocapsid (N) and receptor binding domain (RBD) portion of the Spike protein, were evaluated.MethodsPrecision and linearity were evaluated using standardized procedures. A total of 157 leftover serum samples from 81 hospitalized confirmed COVID-19 patients (38 with moderate and 43 with severe disease) and 76 SARS-CoV-2 negative subjects (44 healthcare workers, 20 individuals with rheumatic disorders, 12 pregnant women) were included in the study. In an additional series of 44 SARS-CoV-2 positive, IgM and IgG time kinetics were also evaluated in a time-period of 38 days.ResultsPrecision was below or equal to 4% for both IgM and IgG, in all the studied levels, whilst a slightly significant deviation from linearity was observed for both assays in the range of values covering the manufacturer’s cut-off. Considering a time frame ≥ 12 days post symptom onset, sensitivity and specificity for IgM were 92.3% (95%CI:79.1%-98.4%) and 92.1% (95%CI:83.6%-97.0%). In the same time frame, sensitivity and specificity for IgG were 100% (95%CI:91.0%-100%) and 93.4% (95%CI:85.3%-97.8%). The assays agreement was 73.9% (Cohen’s kappa of 0.373). Time kinetics showed a substantial overlapping of IgM and IgG response, the latter values being elevated up to 38 days from symptoms onset.ConclusionsAnalytical imprecision is satisfactory as well as the linearity, particularly when taking into account the fact that both assays are claimed to be qualitative. Diagnostic sensitivity of IgG was excellent, especially considering specimens collected ≥12 days post symptom onset. Time kinetics suggest that IgM and IgG are detectable early in the course of infection, but the role of SARS-CoV-2 antibodies in clinical practice still requires further evaluations.

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Reasoned Action Frameworks

Communication ◽

10.1093/obo/9780199756841-0029 ◽

2011 ◽

Author(s):

Marco Yzer ◽

Brian Southwell

Keyword(s):

Action Research ◽

Reasoned Action ◽

Time Frame ◽

Situational Factors ◽

Integrative Model ◽

Behavioral Performance ◽

Reasoned Action Approach ◽

Theoretical Understanding ◽

Wide Range ◽

The Individual

Reasoned action frameworks, which include the Theory of Reasoned Action and its extensions, the widely used Theory of Planned Behavior and the more recent Integrative Model of Behavioral Prediction, describe that intention to perform a behavior follows reasonably (but not necessarily rationally) from specific beliefs that people hold about the behavior and that people act on their intentions when they have the required skills and when situational factors do not impede behavioral performance. Reasoned action research has two broad foci. A first seeks to advance theoretical understanding of human social behavior as based on expectancy beliefs about consequences of behavioral performance. A second applies reasoned action research to development or evaluation of interventions that seek to modify a specific behavior in a particular population. The relevance of the reasoned action approach for communication scholars lies in its direct applicability to a wide range of important communication questions, including the explanation of communication as a socially relevant behavior and intra-individual processes to explain how exposure to information leads to behavior change. Although reasoned action propositions embed belief-based processes in a multilevel system of influence, the individual is nonetheless the primary level of analysis. The range of citations included in this bibliography addresses the decades-long time frame during which scholars have explicitly employed core reasoned action concepts. Beyond the introductory works, the examples presented here are illustrative rather than exhaustive, by necessity, as few other behavioral theories have generated more citations in communication research.

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COVID-19 and thyroid disease: an infodemiological pilot study

10.21203/rs.3.rs-1071237/v1 ◽

2021 ◽

Author(s):

Ioannis ILIAS ◽

Charalambos MILIONIS ◽

Eftychia KOUKKOU

Keyword(s):

Thyroid Disease ◽

Time Frame ◽

Specific Symptom ◽

Disease Epidemiology ◽

Frame Sequence ◽

Search Terms ◽

Time Period ◽

Cross Correlation Analysis ◽

Time Periods ◽

Per Se

Abstract Introduction: Some studies have linked COVID-19 with thyroid disease. Google Trends (GT) searches may reflect disease epidemiology. Recently, GT searches for COVID-19-associated terms have been linked to the epidemiology of COVID-19. In this study we aimed to assess COVID-19 cases per se vs COVID-19-associated GT searches and thyroid-associated GT searches. Materials-Methods: We collected data on worldwide weekly GT searches regarding “COVID-19”, “SARS-COV-2”, “coronavirus”, “smell”, “taste”, “fatigue”, “cough”, “thyroid”, “thyroiditis” and “subacute thyroiditis” for 92 weeks and worldwide weekly COVID-19 cases' statistics in the same time period. The study period was split in half and in each time period we performed cross-correlation analysis and mediation analysis. Results Significant positive CCF values were noted in both time periods; while COVID-19 cases per se were associated with “thyroid” searches in both time periods, significant CCFs for “fatigue”, “COVID-19” and “SARS-COV-s” were mostly found in the second time period. In the latter period, the effect of “COVID-19” searches on “thyroid” searches was significantly mediated by COVID-19 cases (p=0.048). Discussion COVID-19 cases per se were found to be associated with no lag with GT searches for COVID-19 symptoms in the first time period and in the second time period to lead searches for symptoms, COVID-19 terms as well as thyroid terms. Searches for a non-specific symptom or COVID-19 search terms mostly lead GT “thyroid” searches, in the second time period. This time frame/sequence particularly in the second time period (noted by the preponderance of the SARS-COV-2 delta variant), lends some credence to associations of COVID-19 cases per se with (apparent) thyroid disease (via searches for them).

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WORM BIOMASS AND VERMICOMPOST PRODUCTION BY THE EPIGEIC EARTHWORM, PERIONYX EXCAVATUS BY USING DIFFERENT ORGANIC WASTES

10.36106/ijar/7813005 ◽

2021 ◽

pp. 64-68

Author(s):

Karuna S. Ganiger ◽

Milind F. Nagannawar ◽

Soumya R. Patil ◽

Pulikeshi M. Biradar

Keyword(s):

Experimental Studies ◽

Fold Increase ◽

Organic Wastes ◽

Time Intervals ◽

Perionyx Excavatus ◽

Earthworm Species ◽

Wide Range ◽

Biomass Ratio ◽

Polyalthia Longifolia ◽

Ecological Disturbances

As the epigeic earthworms are known to be efcient and potential biodegrades and nutrient releasers, tolerant to wide range of ecological disturbances, aids in litter communication and efcient decomposers. Therefore, the present study was undertaken to nd out the inuence of various organic wastes (such as False Ashoka waste-FAW (Polyalthia longifolia), Parthenium wastePW (Parthenium hysterophorus), Cotton residue waste-CRW (Gossypium), Lawn grass waste-LGW (Agrostis) and Cattle manure-CM) on the production of worm biomass and vermicompost by the epigeic earthworm, Perionyx excavatus along with control compost experiments without worms (in triplicates) to know the potentiality of this worm species in processing of various organic wastes for the production of worm biomass as vermiprotein and vermicompost as biofertilizer. Both compost and vermicompost experimental pots were terminated after 35 and 70 days time intervals. Observations were made with respect to number of old and new adult worms, new sub-clitellates, juveniles, cocoons with their weight were noted to determine the total worm biomass (Gross biomass), biomass ratio (WBR) and Fold Increase in Worm Number (FIWN). Percent compost and vermicompost produced out of different organic waste were also calculated at the end of each experiment at35 and 70 days. The results of the present study revealed that the biomass of Perionyx excavatus such as Gross worm biomass (GWB), Worm biomass ratio (WBR) and Fold increase in worm number (FIWN) increased from 35days to 70 days time intervals in all the organic wastes (FAW, PW, CRW, LGW and CM). It was maximum in CM and minimum in FAW among all the organic wastes. There is a signicant variation was noticed in worm biomass production (GWB, WBR, and FIWN) among and between all the organic wastes except between few organic wastes at 35 and 70 days time intervals. The vermicompost production was more as compared to normal compost in all the organic wastes. Further, both compost and vermicompost production were more in CM followed by LGW, CRW, PW and minimum in FAW among all organic wastes. The signicant difference was also observed in the production of compost and vermicompost among and between different organic wastes except between few organic wastes at different time intervals. Based on the results, it can be concluded that the earthworm, Perionyx excavatus is an efcient epigeic earthworm species, effectively used in vermicomposting for the production of vermicompost and as well as in vermifarming in the production of worm biomass as vermiprotein. Further, earthworm biomass, compost and vermicompost production primarily depends on nature of organic wastes and secondly on the potentiality of earthworm species used in the experimental studies.

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