784 research outputs found
Fig. 7 in Diterpenoids from the genus Euphorbia: Structure and biological activity (2013-2019)
No full textFig. 7. The formation of ingenane-type diterpenoids.Published as part of Xu, Yang, Tang, Peiyu, Zhu, Man, Wang, Yali, Sun, Dejuan, Li, Hua & Chen, Lixia, 2021, Diterpenoids from the genus Euphorbia: Structure and biological activity (2013-2019), pp. 1-14 in Phytochemistry (112846) 190 on page 6, DOI: 10.1016/j.phytochem.2021.112846, http://zenodo.org/record/819426
Diterpenoids from the genus Euphorbia: Structure and biological activity (2013-2019)
No full textXu, Yang, Tang, Peiyu, Zhu, Man, Wang, Yali, Sun, Dejuan, Li, Hua, Chen, Lixia (2021): Diterpenoids from the genus Euphorbia: Structure and biological activity (2013-2019). Phytochemistry (112846) 190: 1-14, DOI: 10.1016/j.phytochem.2021.112846, URL: http://dx.doi.org/10.1016/j.phytochem.2021.11284
Fig. 2 in Diterpenoids from the genus Euphorbia: Structure and biological activity (2013-2019)
No full textFig. 2. Skeleton types of Euphorbia diterpenoids.Published as part of Xu, Yang, Tang, Peiyu, Zhu, Man, Wang, Yali, Sun, Dejuan, Li, Hua & Chen, Lixia, 2021, Diterpenoids from the genus Euphorbia: Structure and biological activity (2013-2019), pp. 1-14 in Phytochemistry (112846) 190 on page 3, DOI: 10.1016/j.phytochem.2021.112846, http://zenodo.org/record/819426
Fig. 1 in Diterpenoids from the genus Euphorbia: Structure and biological activity (2013-2019)
No full textFig. 1. Two ways of diterpenoid cyclization.Published as part of Xu, Yang, Tang, Peiyu, Zhu, Man, Wang, Yali, Sun, Dejuan, Li, Hua & Chen, Lixia, 2021, Diterpenoids from the genus Euphorbia: Structure and biological activity (2013-2019), pp. 1-14 in Phytochemistry (112846) 190 on page 2, DOI: 10.1016/j.phytochem.2021.112846, http://zenodo.org/record/819426
Sava Georgiovich Yali
No full textСтаття присвячена долі Сави Георгійовича Ялі — провідної постаті радянської політики грецизації, здійснюваної впродовж 1924–1937 рр. Стаття досліджує взаємовідносини грецької етнічної меншини УСРР та органів державної влади під час коренізації. Особлива увага приділена обставинам культурного життя українських греків, передовсім у сфері освіти, культурного життя, преси, книговидавництва, мовного розвитку в контексті процесів мовної модернізації. Перспективи реалізації більшовицької доктрини національної лібералізації на перехідний період у сфері владних, політичних, соціальних можливостей та обмежень аналізуються на тлі історії життя, професійної діяльності та трагедії одного з більшовицьких функціонерів.The article focuses on the destiny of Sava Georgiovich Yali, one from the most important figures of the Soviet policy of Greekization during the period 1924–1937. The author investigates the relations between the Greek ethnical minority of the USRR and the state authority within the policy of nativization (korenization). Special attention has been paid to the circumstances of the Ukrainian Greeks’ cultural life, especially in the line of education, cultural establishments, the press, book productions, and national languages development in the context of languages modernization process, etc. The perspectives of the Bolshevik doctrine of national liberation realization during the transitional period under the circumstances of legal, political, social possibilities and limitations have been analyzed in the context of the history of the ways of life, professional work, and a personal tragedy of Sava G. Yali, one of the Bolshevik functionaries
Sava Georgiovich Yali
No full textСтаття присвячена долі Сави Георгійовича Ялі — провідної постаті радянської політики грецизації, здійснюваної впродовж 1924–1937 рр. Стаття досліджує взаємовідносини грецької етнічної меншини УСРР та органів державної влади під час коренізації. Особлива увага приділена обставинам культурного життя українських греків, передовсім у сфері освіти, культурного життя, преси, книговидавництва, мовного розвитку в контексті процесів мовної модернізації. Перспективи реалізації більшовицької доктрини національної лібералізації на перехідний період у сфері владних, політичних, соціальних можливостей та обмежень аналізуються на тлі історії життя, професійної діяльності та трагедії одного з більшовицьких функціонерів.The article focuses on the destiny of Sava Georgiovich Yali, one from the most important figures of the Soviet policy of Greekization during the period 1924–1937. The author investigates the relations between the Greek ethnical minority of the USRR and the state authority within the policy of nativization (korenization). Special attention has been paid to the circumstances of the Ukrainian Greeks’ cultural life, especially in the line of education, cultural establishments, the press, book productions, and national languages development in the context of languages modernization process, etc. The perspectives of the Bolshevik doctrine of national liberation realization during the transitional period under the circumstances of legal, political, social possibilities and limitations have been analyzed in the context of the history of the ways of life, professional work, and a personal tragedy of Sava G. Yali, one of the Bolshevik functionaries
An exploratory study of electrolysis of natural iron ores for iron production
No full textLAUREA MAGISTRALELa produzione di acciaio è considerata una delle industrie più difficili da decarbonizzare, a causa della sua dipendenza con il carbone, dovuto ai processi carbotermici. E' responsabile per circa l'8% delle emissioni globali di CO2. Per la decarbonizzazione dell'industria di acciaio e ferro, l'approccio elettrochimico per la riduzione di ossidi di ferro è un'alternativa promettente grazie al metodo termochimico, dovuto al basso consumo di energia e senza l'utilizzo intermedio di vettori energetici, come l'idrogeno.
Questo lavoro analizza la fattibilità dell'elettrolisi alcalina a bassa temperatura dei minerali naturali per la produzione di ferro attraverso esperimenti su scala di laboratorio. Il primo aspetto studiato riguarda la misurazione diretta in tempo reale della massa del ferro durante il processo di riduzione, utilizzando una cella di carico. Questa misurazione in tempo reale aiuta a comprendere meglio cosa succede durante il processo di deposizione all'interno dell’elettrolita opaco in sospensione. I profili di incremento di massa misurati mostrano un aumento complessivo lineare durante il processo di deposizione. Tuttavia, in assenza di agitazione nel sistema, l’aumento di peso raggiunge un plateau dopo circa 40 minuti, a causa della sedimentazione delle particelle del minerale. Con agitazione, invece, le particelle di minerale sono mantenute in sospensione, garantendo un contatto sufficiente con gli elettrodi o la loro dissoluzione in soluzione, elemento cruciale per un'efficace elettrodeposizione.
Successivamente, sono stati eseguiti esperimenti elettrochimici sistematici per studiare l'efficienza dell'elettrodeposizione del ferro utilizzando minerali di ferro naturali come materia prima. La caratterizzazione dei materiali è stata effettuata prima e dopo gli esperimenti, mediante analisi XRD e SEM. In generale, gli esperimenti dimostrano la fattibilità della produzione di ferro ad alta purezza attraverso l'elettrolisi alcalina dei minerali di ferro a basse temperature, intorno ai 110°C. Tuttavia, l'efficienza della deposizione dipende fortemente dal sistema operativo, tra cui la dimensione e la composizione delle particelle, l'efficienza della miscelazione dell'elettrolita in sospensione, etc. In questo studio è stata raggiunta un’efficienza faradica del 72% utilizzando una concentrazione del 20% in peso di ossidi di ferro (43% Ematite, 52% Magnetite, 5% scarto) con una dimensione media di 20 micron e un miscelazione sufficiente dell’elettrolita a 200 rpm.
Infine, è stato sviluppato un modello matematico per descrivere il meccanismo di dissoluzione e rideposizione di questo processo elettrolitico. Utilizzando un Modello del Nucleo in Contrazione (Shrinking Core Model) per descrivere la dissoluzione delle particelle, il modello matematico spiega qualitativamente l’effetto della dimensione delle particelle sull’efficienza della deposizione, come osservato negli esperimenti condotti.
L'intero progetto/studio è considerato un primo, ma importante, passo verso l’applicazione industriale dell’elettrolisi a bassa temperatura per una produzione pulita di ferro e acciaio.Steelmaking is considered one of the hard-to-abate industries, for its high dependence on coal, due to carbothermic processes. It is responsible for about 8% of CO2 global emissions. For decarbonization of steel and iron industry, the electrochemical approach for reduction of iron ores is a promising alternative to thermochemical method due to its small energy consumption and without the intermediate use of energy vectors, such as hydrogen.
This work investigates the feasibility of low-temperature alkaline electrolysis of natural ores for iron production via lab-scale experiments. This work first concerns direct measurement of in-line measurement of iron mass during the reduction process using a load cell. This in-line measurement helps to better understand what's going on for the deposition process inside the slurry opaque electrolyte. The measured mass gain profiles show an overall linear increase during the deposition process. However when no stirring/agitation applied in the system, the weight gain reaches to a plateau in about 40 minutes, which is caused by the sedimentation of the ore particles. With stirring/agitation, the ore particles are maintained in suspension, which ensures sufficient contact with electrodes or dissolution into solution, crucial for effective electrodeposition.
Next, systematic electrochemical experiments were performed to study the efficiency of iron electrodeposition using natural iron ores as feedstock. Material characterization was done before and after the experiments, by means of XRD and SEM examinations. In general, the experiments demonstrate the feasibility of production of high-purity iron through alkaline electrolysis of iron ores at low temperatures around 110°C. However, the deposition efficiency highly depends on the operation system, including the particle size and composition, mixing efficiency for the slurry electrolyte, etc. A Faradaic efficiency of 72% was achieved in this study using 20 wt% of iron ore (43% Hematite, 52% Magnetite, 5% gauge) with mean size of 20 microns, with sufficient mixing of the electrolyte at 200 rpm.
Finally, a mathematical model was established to describe the dissolution-redeposition mechanism of this electrolysis process. With a Shrinking Core Model for the description of particle dissolution, this mathematical model qualitatively explains the effect of particle size on the deposition efficiency, which was observed from current experiments.
The entire project/study is considered a first yet important step towards industrial application of low-temperature electrolysis for clean iron and steel production
Stigmaeus ueckermanni Yali, Khanjani & Razmjou, 2011, sp. nov.
No full textStigmaeus ueckermanni sp. nov. (Figs. 1–9). Diagnosis (Female). Prodorsal shield reticulated centrally, dorsum with 14 pairs of setae, coxa IV with two setae, trochanter III with two setae, femur IV with four setae, three pairs of aggenital setae, two dorsal hysterosomal setae c 1 25 (29); distance of vi/vi - vi 0.55 (0.56), c 1 / c 1 - c 1 0.49 (0.37); c 1 - c 1 : d 1 - d 1 : e 1 - e 1 : f 1 - f 1 0.1.0 (0.98): 0.72 (1.0): 0.67 (069): 1.0. FEMALE (n = 2). Color in life red. Idiosoma oval. Measurements: Length of body (excluding gnathosoma) 580 (590); width 310 (290); length of leg I 227 (247); leg II 175 (180); leg III 172 (190), leg IV 220 (224). Dorsum (Fig. 1). Prodorsal shield almost oblong and reticulated centrally; with three pairs of setae (vi, ve, sci), no eyes (Fig. 1); opisthosoma with four paired and two unpaired shields (median and suranal) (Fig. 1). Seta c 2 situated ventro-laterally between coxae II-III. Setae vi / ve 0.79 (1.0) almost as long as setae vi, seta sce on lateral propodosomal shield; lengths of dorsal setae: vi 22 (25), ve 28 (25), sci 25 (26), sce 29 (32), c 1 27 (30), c 2 38 (43), d 1 22 (25), d 2 22 (24), e 1 27 (25), e 2 24 (28), f 1 29 (30), h 1 32 (35), h 2 42 (41), h 3 20 (27); distances between dorsal setae: vi - vi 40 (45), ve - ve 77 (76), vi - ve 34 (38), sci - sci 106 (110), sci - sce 41 (38), sce - sce 185 (190), ve - sci 46 (50), c 1 - sci 85 (103), c 2 - sce 95 (99), c 1 - c 1 76 (78), c 1 - c 2 115 (98), c 2 - c 2 279 (275), c 1 - d 1 80 (81), d 1 - d 1 55 (58), d 1 - d 2 62 (60), d 1 - e 1 73 (68), d 1 - e 2 85 (79), d 2 -d 2 83 (85), e 1 - e 1 51 (55), e 2 - e 2 175 (170), e 1 - e 2 60 (64), d 1 - e 2 79 (85), d 2 - e 2 82 (84), e 1 - f 1 41 (43), f 1 - f 1 76 (80), f 1 - h 1 65 (59), h 1 - h 1 40 (42), f 1 - h 2 65 (59), h 2 - h 2 80 (75-86), h 3 - h 3 113 (117), h 2 -h 3 13 (15); ratio: vi/vi - vi 0.55 (0.56), c 1 / c 1 - c 1 0.49 (0.37), d 1 / d 1 - d 1 0.40 (0.46), e 1 / e 1 - e 1 0.51 (0.45), f 1 / f 1 - f 1 0.38 (0.37), h 1 / h 1 - h 1 0.8 (0.88), h 2 /h 2 - h 2 0.51 (0.51), h 3 /h 3 - h 3 0.17 (0.24), h 2 /h 3 2.1 (0.81), h 1 /h 2 0.76 (1.56) c 1 - c 1 : d 1 -d 1 : e 1 - e 1 : f 1 - f 1 0.1.0 (0.98): 0.72 (1.0): 0.67 (0.69): 1.0. Venter (Fig. 5). Venter with diagonal striae between coxae II–III; coxae I–II and III–IV surrounded by longitudinal striae (Fig. 5). Length of setae la 25 (28), 1 b 27 (28), 1 c 32 (38), 2 b 43 (38), 2 c 32 (35), 3a 30 (31), 3 b 26 (25), 3 c 22 (25), 4a 28 (25), 4 b 20 (21) and 4 c 20 (19). Aggenital (ag 1-4) setae ag 1 as long as ag 2,- 3; and pseudanal seta ps 1 shorter than ps 2 - 3; measurements of setae: setae ag 1 18 (18), ag 2 21 (20), ag 3 21 (22), ag 4 25 (28), g 1 26 (30), g 2 23 (30), ps 1 21 (25), ps 2 33 (35), ps 3 31 (24). Distances: ag 1 - ag 1 27 (29), ag 2 - ag 2 42 (45), ag 3 - ag 3 55 (56), ag 4 -ag 4 58 (67), ag 1 -ag 2 12 (15), ag 2 -ag 3 40 (38), ag 3 -ag 4 15 (18), g 1 -g 1 6 (7), g 2 -g 2 10 (10), g 1 - g 2 21 (25), ps 1 - ps 1 50 (35), ps 2 - ps 2 53 (45), ps 3 - ps 3 40 (23), ps 2 - ps 3 20 (21). Gnathosoma (Figs. 2-4). Subcapitulum with two pairs of subcapitular setae, m 19 (25) and n 26 (29), two pairs of adoral setae, or 1 9 (7), or 2 10 (8); distances: or 1 - or 1 12 (12), or 2 - or 2 16 (20), or 1 - or 2 2 (3), m- m 41 (40), n-n 30 (40), or 1 - m 32 (33), or 2 - m 34 (36), m - n 9 (8) (Fig. 4). Chelicerae free 70 (65), movable digit 28 (25). Chelicera depicted in Fig. 2. Palpi five segmented, palp tarsus with four simple setae + one simple eupathidion + one three - tined eupathidion 8 (9) + one solenidion (ω) 8 (9), palp tibia with one well developed claw + one accessory claw + two simple setae, palp genu with one setae, palp femur with three setae and palp coxae with ε p seta 3 (4) (Fig. 3). Legs (Figs. 4-7) - Legs about half length of body. Setal formulae of leg segments as follows (with solenidia, in parenthesis): coxae 2 + (1 ε p) - 2 - 2 - 2; trochanters 1 - 1 - 2 - 1; femora 4 - 4 - 3 - 2, genua 3 + 1 ĸ - 3 + 1 ĸ - 2 - 2; tibiae 5 + 1 φρ + 1 φ- 5 + 1 φρ - 5 + 1 φρ - 5 + 1 φρ; tarsi 13 + 1 ω - 8 + 1 ω - 7 + 1 ω - 7 + 1 ω. Length of solenidia: I ω 19 (22), II ω 14 (15), III ω 12 (13), IV ω 7 (9). Coxa I possesses supracoxal spine-like seta 1 ε p 4 (4) long. Discussion. Stigmaeus ueckermanni sp. nov. is similar to S. reductus Barilo, 1986 in the shape of the prodorsal shield, suranal shield, presence of seta h 3, setal formula of femora and the number of median opisthosomal setae. However, it can easily be differentiated by: median opisthosomal shield in S. ueckermanni reticulated medially but smooth in S. reductus; trochanter III with two setae in S. ueckermanni compared with one in S. reductus; setal count of genua 5 + (ĸ) - 4 + (ĸ) - 2 - 2 in the first species but 3 + (ĸ) - 3 + (ĸ) - 2 - 2 in the second species; tibia II with 8 + (ω) in the new species opposed to 9 + (1 ω) in S. reductus; intercalary and lateral opisthosomal shields smooth in the former whereas faintly polygonal in the latter; seta c 2 38 (43) long in S. ueckermanni but 20 (22) in S. reductus; sce 29 (32), c 1 27 (30), e 1 27 (25), f 1 29 (30), h 1 32 (35) vs sce, f 1, h 1 = 20 - 22; c 1 , e 1 = 16–18. Etymology. This species is named in honor of Prof. Edward A. Ueckermann, ARC - Plant Protection Research Institute, Pretoria, distinguished and well known Acarologist of the world and also for his kind assistance to Iranian Acarologists in the past two decades, especially with the junior author. Material examined. Holotype female, 11 April 2011, collected from soil, Heyran road, Ardabil, Aldabil, Iran province (38 ° 26 ʹ 85 ʹ E, 48 ° 34 ʹ 28 ʹ N, 1316 a.s.l.). One paratype female with the same data. Both holotype and paratype female of the new species are preserved as slide-mounted specimens. The holotype is deposited in the Collection of the Acarology Laboratory, University of Bu-Ali Sina, Hamadan, Iran, and one paratype female will be deposited in the National Collection of Arachnida, Plant Protection Research, Pretoria, South Africa.Published as part of Yali, Maryam Pahlavan, Khanjani, Mohammad & Razmjou, Jabraeil, 2011, A new stigmaeid mite species from Iran (Acari: Stigmaeidae) and re-description of Stigmaeus longipilis (Canestrini), pp. 60-68 in Zootaxa 3089 on pages 61-64, DOI: 10.5281/zenodo.20324
Protective Effect of Tang Wang One Decoction on the Retinal Vessels of Diabetic Rats
No full textObjective. This study aimed to determine the influence of Tang Wang One Decoction (TWOD) on the retinal vessels of diabetic rats. Methods. The hemorheology of diabetic rats was observed. Morphological studies of retinal vessels were conducted using optical microscopy and electron microscopy. Immunological histochemistry assay was used to measure the expression levels of MMP-9, occludin, and claudin-5. Results. Obvious pathological damage was observed in the retinal vessels of diabetic rats. TWOD positively affected the hemorheology and morphology of retinal vessels. The decoction also decreased the expression of MMP-9 and increased the expression of occludin and claudin-5. Conclusions. The results suggest that the retinal protective effects of TWOD might be related to downregulation of MMP-9 and upregulation of occludin and claudin-5.</jats:p
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