2.11 Polymers of Biological Origin ☆

Author(s):  
S.S. Silva ◽  
E.M. Fernandes ◽  
S. Pina ◽  
J. Silva-Correia ◽  
S. Vieira ◽  
...  
Keyword(s):  

The application of preparations of biological origin in the protection system of soybean grown under conditions of intensive irrigated crop rotations conforms to the modern tendencies of science and production development. The use of them contributes to solving ecological, production and social-economic problems. The study presents the three-year research on the efficiency of systems protecting soybean from pests and diseases based on biological and chemical preparations. The research was conducted in typical soil and climate conditions of the South of Ukraine. Zonal agricultural methods and generally accepted research methodology were used. The purpose of the research was to create a soybean protection system based on preparations of biological origin, ensuring high productivity of high-quality products reducing a negative impact of the crop production on the environment. The study emphasizes that, under irrigated conditions of the South of Ukraine, the application of biological preparations has a positive impact on the indexes of growth, development and formation of the elements of soybean yield structure. There was an increase in the crop biological weight by 13.8 % and 22.1 % and the number of seeds per plant rose by 11.6 and 14.6 % as a consequence of eliminating harmful organisms with the plant protection systems. The larger ground mass was formed by medium-ripe varieties Danai and Svyatogor, on which the increase from protection measures was higher. Weight 1000 pcs. the seeds did not undergo significant changes. It is established that the larger seeds were formed by Danaya and Svyatogor varieties, in which the average weight is 1000 pcs. seeds were 142 and 136 g, respectively, while in the variety Diona this figure was 133 g. There was an increase in the height of the lowest pod when the total plant height rose. For medium-ripe varieties was characterized by a higher attachment of beans, where the highest values of this indicator acquired in the variety Svyatogor. The medium maturing soybean variety Danaia formed the maximum yield of 3.23 and 3.35 t/ha respectively, when biological and chemical protection systems were applied. The research establishes that the application of the bio-fungicide Psevdobakterin 2 (2.0 l/ha) in the crop protection system at the beginning of soybean flowering and the bio-fungicide Baktofit (2.5 l/ha) with the bio-insecticide Lepidotsid-BTU (10.0 l/ha) at the beginning of pod formation does not reduce the productivity of the soybean varieties under study considerably, when compared to the application of chemical preparations. The research determines that the soybean protection system under study ensures a decrease in the coefficient of soybean water uptake by 7.2-13.0 %, increasing the total water intake to an inconsiderable degree. Biologization of the soybean crop protection system leads to a reduction in production costs compared to the chemical protection system. Taking into account the needs for the collection of additional products, costs increase by an average of 1 thousand UAH/ha, while for chemical protection systems by 1.8 thousand UAH/ha. At the same time, the cost is reduced by 220-360 UAH/t and the profitability of growing crops is increased by 3.8-7.8 %. There has been a reduction in the burden of pesticides on the environment and the production of cleaner products. This indicates the prospect of using the biofungicides Pseudobacterin 2 and Bactophyte and the bioinsecticide Lepidocid-BTU on soybeans to protect plants from pests.


2021 ◽  
Vol 11 (12) ◽  
pp. 5493
Author(s):  
Andrzej Gawor ◽  
Andrii Tupys ◽  
Anna Ruszczyńska ◽  
Ewa Bulska

Nowadays growing attention is paid to the control of fluorine content in samples of biological origin as it is present in the form of various biologically active organic compounds. Due to the chemically-rich matrix of biological tissues, the determination of fluorine becomes a very difficult task. Furthermore, a required complex sample preparation procedure makes the determination of the low contents of F by ion chromatography UV-Vis or ion-selective electrodes not possible. High-resolution continuum source graphite furnace molecular absorption spectrometry (HR-CS GF MAS) seems to be the best option for this purpose due to its high robustness to matrix interferences, especially in the presence of carefully selected modifiers. In this work the possibility of quantitative F determination in water and animal tissues was examined by measuring the molecular absorption of gallium monofluoride (GaF) at 211.248 nm with the use of a commercially available HR-CS GF MAS system. Experimental conditions for the sensitive and precise determination of fluorine were optimized, including the time/temperature program as well as addition of gallium and modifier mixture in combined mode. Under these conditions the fluoride present in the sample was stabilized up to 600 °C, and the optimum vaporization temperature for GaF was 1540 °C. Palladium and zirconium deposited onto the graphite surface served as solid modifiers; sodium acetate and ruthenium modifiers were added directly to the sample. The limit of detection and the characteristic mass of the method were 0.43 μg/L and 8.7 pg, respectively. The proposed procedure was validated by the use of certified reference materials (CRMs) of lake water and animal tissue; the acceptable recovery was obtained, proving that it can be applied for samples with a similar matrix.


Cellulose ◽  
2021 ◽  
Author(s):  
Katri S. Kontturi ◽  
Koon-Yang Lee ◽  
Mitchell P. Jones ◽  
William W. Sampson ◽  
Alexander Bismarck ◽  
...  

Abstract Cellulose nanopapers provide diverse, strong and lightweight templates prepared entirely from sustainable raw materials, cellulose nanofibers (CNFs). Yet the strength of CNFs has not been fully capitalized in the resulting nanopapers and the relative influence of CNF strength, their bonding, and biological origin to nanopaper strength are unknown. Here, we show that basic principles from paper physics can be applied to CNF nanopapers to illuminate those relationships. Importantly, it appeared that ~ 200 MPa was the theoretical maximum for nanopapers with random fibril orientation. Furthermore, we demonstrate the contrast in tensile strength for nanopapers prepared from bacterial cellulose (BC) and wood-based nanofibrillated cellulose (NFC). Endemic amorphous polysaccharides (hemicelluloses) in NFC act as matrix in NFC nanopapers, strengthening the bonding between CNFs just like it improves the bonding between CNFs in the primary cell wall of plants. The conclusions apply to all composites containing non-woven fiber mats as reinforcement. Graphic abstract


Agronomy ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 1192
Author(s):  
Natalia Gutiérrez ◽  
Leyre López-de-Silanes ◽  
Carlos Escott ◽  
Iris Loira ◽  
Juan Manuel del Fresno ◽  
...  

Canopy management practices in vineyards, such as sprawling systems and shoot trimming, can change the accumulation of metabolites in grapes. The use of elicitors of biological origin on grapevines of Vitis vinifera red grape varieties may also modulate the chemical composition of the berries. These modifications are often observed in the accumulation of phenolic compounds, including pigments. Both technical approaches are alternatives involved in minimizing the effects of global climate change in warm areas. The increase of temperature related to climate change accelerates the accumulation of sugars, but produces unbalanced grapes. This work establishes the use of button sensors to monitor the climate changes occurring at grape cluster level. Together with climate monitoring, conventional instrumental analytical techniques are used to follow up the chemical composition and the phenolic fraction of grapes in four different production areas in Spain. The effect of either treatment seems variable and to be affected by external factors besides the treatment itself and the climate conditions. While there is a fine effect that correlates with the use of elicitors in varieties like Merlot and Tempranillo, there is minimal improvement observed in Tintilla de Rota. The total phenolic index increases were between 2.3% and 11.8% in the first two parcels. The same happened with the vineyard’s canopy management systems, with increased pigment accumulation and the total phenolic index rising (37.7% to 68.7%) after applying intense shoot trimming, or a variation in sugar concentrations when using sprawl conduction. This study aims to provide viticulturists and oenologists in particular, and farmers in general, with data on the field regarding the use of alternative sustainable practices in the cultivation of grapes. The techniques used involved 100% natural products without adjuvants. The benefits obtained from applying some of these practices would be to produce technically mature grapes despite climate changes, and the elaboration of more balanced wines.


2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Ákos Sudár ◽  
Gergely Futaki ◽  
Róbert Kovács

Abstract The thermal modeling of biological systems is increasingly important in the development of more advanced and more precise techniques such as ultrasound surgery. One of the primary barriers is the complexity of biological materials: the geometrical, structural, and material properties vary in a wide range. In the present paper, we focus on the continuum modeling of heterogeneous materials of biological origin. There are numerous examples in the literature for non-Fourier thermal models. However, as we realized, they are associated with a few common misconceptions. Therefore, we first aim to clarify the basic concepts of non-Fourier thermal models. These concepts are demonstrated by revisiting two experiments from the literature in which the Cattaneo–Vernotte and the dual phase lag models are utilized. Our investigation revealed that these non-Fourier models are based on misinterpretations of the measured data, and the seeming deviation from Fourier’s law originates from the source terms and boundary conditions.


2016 ◽  
Vol 125 (1) ◽  
pp. 57-61 ◽  
Author(s):  
Amparo Wolf ◽  
Huda Alghefari ◽  
Daria Krivosheya ◽  
Michael D. Staudt ◽  
Gregory Bowden ◽  
...  

The biological origin of cerebellar liponeurocytomas is unknown, and hereditary forms of this disease have not been described. Here, the authors present clinical and histopathological findings of a young patient with a cerebellar liponeurocytoma who had multiple immediate family members who harbored similar intracranial tumors. A 37-year-old otherwise healthy woman presented with a history of progressive headaches. Lipomatous medulloblastoma had been diagnosed previously in her mother and maternal grandfather, and her maternal uncle had a supratentorial liponeurocytoma. MRI revealed a large, poorly enhancing, lipomatous mass emanating from the superior vermis that produced marked compression of posterior fossa structures. An uncomplicated supracerebellar infratentorial approach was used to resect the lesion. Genetic and histopathological analyses of the lesion revealed neuronal, glial, and lipomatous differentiation and confirmed the diagnosis of cerebellar liponeurocytoma. A comparison of the tumors resected from the patient and, 22 years previously, her mother revealed similar features. Cerebellar liponeurocytoma is a poorly understood entity. This report provides novel evidence of an inheritable predisposition for tumor development. Accurate diagnosis and reporting of clinical outcomes and associated genetic and histopathological changes are necessary for guiding prognosis and developing recommendations for patient care.


Author(s):  
Naoko Saito

This article broaches what can sometimes be seen as the suppression of the female voice, sometimes the repression of the feminine. To address these matters involves the reconsideration of the political discourse that pervades education and educational research. This article is an attempt to disclose inequity in apparently equitable space, through the acknowledgment of the voice of disequilibrium. It proposes to re-place the subject of philosophy, and the subject of woman, through an alternative idea of the feminine voice in philosophy. It tries to reconfigure the female voice without negating its fated biological origin and traits, and yet avoiding the confining of thought to the constraints of gender divides. In terms of education, it shall argue for the conversation of justice as a way of cultivating the feminine voice in philosophy: as the voice of disequilibrium. This is an occasion of mutual destabilization and transformation of man and woman, crossing gender divides, and preparing an alternative route to political criticism that not only reclaims the rights of women but releases the thinking of men and women, laying the way for a better, more pluralist, and more democratic politics. The feminine voice can find a way beyond the dominance of instrumental rationality and calculative thinking in the discourse on equity itself. And it can, one might reasonably hope, have an impact on the curriculum of university education.


2021 ◽  
Vol 36 (Supplement_1) ◽  
Author(s):  
J Simas ◽  
D Braga ◽  
A Setti ◽  
R Melamed ◽  
A Iaconell ◽  
...  

Abstract Study question Do couples undergoing assisted reproduction treatments (ART) have a different perception of anonymous vs identity-release gamete donation than a population interested in the subject? Summary answer Compared with a population interested in the subject, more couples undergoing ART believed the child shouldn’t be given information that would identify the gamete-donor. What is known already Recent research has investigated the psychological well-being of parents and children born through gamete donation, focusing on the possibility of having the donor’s identity revealed. Gamete donors have traditionally been anonymous to recipients and offspring; however, there is a global trend towards programs using donors that are identifiable to the resulting offspring at maturity. While some countries only allow the use of identity-release egg donation, others only allow anonymous-donation, and in some countries both types of donation are practiced. However, the attitudes concerning anonymous vs identity-release gamete donation, in a country where only anonymous donation is allowed, are still unknown. Study design, size, duration This cross-sectional study was performed from 01/Sep/2020 to 15/Dec/2020. For that, surveys through online-platforms were conducted, including either patients undergoing ART, (ART-group, n = 358) or those interested in the subject, who accessed the website of a university-affiliated IVF-center (interested-group, n = 122). Participants in the ART-group were invited via e-mail, with a cover-letter outlining the survey and a link to access it and participants in the interested-group accessed the questionnaire via website. Participants/materials, setting, methods The survey collected information on demographic characteristics and the participant’s attitudes towards anonymity of gamete donors. The questions were: (i) In the case of children conceived through ART, do you believe that revealing the method of conception may affect the relationship between children and their parents? (ii) Once the method of conception is revealed, do you believe that the child has the right to know the gamete donor? (iii) If yes, when? Main results and the role of chance Most of the participants answered that the relationship between children and parents wouldn’t be affected by the child’s knowledge of the origin of their conception, regardless of the group (83.6% vs 82.7%, for ART-group and interested-group, respectively, p = 0.868). Most participants in the ART-group answered that the sperm donor identity shouldn’t be revealed to the child, while only half of the interested-group stated the same (65.4% vs 50.8%, p = 0.044). The same result was observed when participants were asked if the oocyte donor should be identifiable (64.8% vs 50.8%, p = 0.050). When asked when the donor’s identity should be revealed to the child, no significant differences were noted in the responses among the groups (p = 0.868). Most of the participants who believe that the child has the right of learning the donor’s identity, stated that “the donor’s identity should be revealed if the child questions its biological origin” (67.2% vs 67.5%, for ART-group and interested-group, respectively). “Since birth” was the second most common response, (21.0% vs 19.7%, for ART-group and interested-group, respectively), while “when the child turns 18 years-old” (9.2% vs 11.2%, for ART-group and interested-group, respectively), and “sometime during teenage years” (2.5% vs 2.4%, for ART-group and interested-group, respectively) were less common answers. Limitations, reasons for caution Lack of adequate opportunities to conduct face to face interview and lack of knowledge of the real state of the website participants, concerning infertility or being involved in ART. The retrospective nature of the study and the small sample size may also be reasons for caution, Wider implications of the findings: It has been discussed that, whether or not children or parents are harmed by knowing their biological origins, donor offspring have the right to know. However, when facing the situation, couples undergoing ART would argue that in case of gamete donation, there are reasons for not telling the child. Trial registration number Not applicable


2021 ◽  
Vol 16 (1) ◽  
pp. 208-225
Author(s):  
D.N. NECHAEV ◽  
◽  
T.N. BUKREEVA ◽  

The purpose of the article is to determine the main prerequisites for the development of Russian-Chinese anti-terrorist cooperation, to study the international treaty base that determines the priority areas of bilateral interaction, based on the dynamics of joint anti-terrorist activities, to propose a periodization of interaction between the two countries in the area under study. The research methodology is based on a systematic analysis of bilateral cooperation between Russia and China in countering terrorism. In the course of the study, the authors analyzed the treaty base within the framework of this topic, the UN reports on terrorism and the FATF recommendations for Russia and China. As a result, on the basis of the proposed periodization, it is demonstrated that Russian-Chinese bilateral cooperation in the fight against terrorism is of an applied systemic nature and is fine-tuned in the areas of holding consultative meetings, countering the financing of terrorist activities and organizing joint military exercises. The authors revealed that the problematic area of interaction is the exchange of operational information in the framework of terrorist financing, associated with the unwillingness of the Chinese side to provide relevant information at their disposal. In conclusion, it is proved that it is advisable to expand cooperation between Russia and China in the fight against international terrorism in the direction of countering non-standard challenges and threats to the information space, biological origin, chemical impact and environmental nature.


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