scholarly journals PHYSICAL AND CHEMICAL STUDY OF THE STRUCTURE OF IONITE COMPLEXES WITH 3D-METALS

2021 ◽  
Vol 79 (1-1) ◽  
Author(s):  
Ximoyat Ismailova ◽  
Shodlik Khasanov ◽  
Davronbek Bekchanov ◽  
Xushhud Azizjanov
Keyword(s):  
Chemical Study ◽  
3D Metals ◽  
Physical And Chemical

XXIII.—Types of Development of Polytene Chromosomes

1942 ◽  
Vol 61 (3) ◽  
pp. 316-327 ◽  
Author(s):  
A. M. Mellad
Keyword(s):  
Salivary Gland ◽  
Polytene Chromosomes ◽  
Chemical Study ◽  
New Techniques ◽  
Physical And Chemical

Until a few years ago the small size of the chromosomes limited the methods which could be used for their physical and chemical study. The discovery in 1933 that the salivary gland nuclei of Diptera contained giant multiple or polytene chromosomes threw the field open to the application of a variety of new techniques.

scholarly journals APPLICABILITY OF THE LANGMUIR-HINSHELWOOD MODEL TO HYDROGENATION OF MONO - AND DISACCHARIDES ON THE Ru/HPS MN 100 CATALYST

2020 ◽  
pp. 29-40
Author(s):  
Максим Евгеньевич Григорьев ◽  
Олег Викторович Манаенков ◽  
Валентина Геннадьевна Матвеева ◽  
Роман Викторович Бровко
Keyword(s):  
Low Temperature ◽  
Specific Surface ◽  
Photoelectron Spectroscopy ◽  
Kinetic Studies ◽  
Nitrogen Adsorption ◽  
Chemical Study ◽  
Hydrogenation Reaction ◽  
Hydrogen Chemisorption ◽  
Entire Volume ◽  
Physical And Chemical

В данной статье представлены данные по физико-химическому исследованию гетерогенного рутений содержащего катализатора Ru/СПС MN 100. Представлена важность таких исследование для изучения каталитических реакций, для установления возможного механизма реакции гидрирования, а так же как дополнения при кинетических исследованиях. В статье катализатор исследован методом низкотемпературной адсорбции азота, хемосорбции водорода, просвечивающей электронной микроскопии (ПЭМ) и рентгенофотоэлектронной спектроскопии (РФЭС). Метод низкотемпературной адсорбции азота позволил установить, что катализатор характеризуется развитой внутренней удельной поверхностью (726 м/г по модели БЭТ) и характеризуется значительной мезопористостью, при этом наибольший диаметр пор составляет около 3.6 нм. Удельная площадь поверхности активного металла - Ru, по данным метода хемосорбции водорода, составляет 1 м/г. Рутений содержащие частицы распределены по всему объему носителя, при этом они способны образовывать небольшие агрегаты и характеризуются различной степенью кристалличности. Установлен элементный состав поверхности катализатора; Ru имеет различные степени окисления. На основании полученной ранее математическая модель процесса и проведенных физико-химических исследований катализатора предположена модель Ленгмюра-Хиншельвуда для описания механизма реакции жидкофазного каталитического гидрирования моно- и дисахаридов. This article presents data on the physical and chemical study of heterogeneous ruthenium-containing catalyst Ru/SPS MN 100. The importance of such studies for the study of catalytic reactions, for establishing the possible mechanism of the hydrogenation reaction, as well as additions in kinetic studies is presented. In this paper, the catalyst was studied by low-temperature nitrogen adsorption, hydrogen chemisorption, transmission electron microscopy (TEM), and x-ray photoelectron spectroscopy (XPS). The method of low-temperature nitrogen adsorption allowed us to establish that the catalyst is characterized by a developed internal specific surface (726 m/g according to the BET model) and is characterized by significant mesoporicity, with the largest pore diameter of about 3.6 nm. The specific surface area of the active metal - Ru, according to the method of hydrogen chemisorption, is 1 m/g. Ruthenium containing particles are distributed over the entire volume of the carrier, while they are able to form small aggregates and are characterized by different degrees of crystallinity. The elemental composition of the catalyst surface has been determined; Ru has different oxidation States. Based on the previously obtained mathematical model of the process and physical and chemical studies of the catalyst, the Langmuir-Hinshelwood model is proposed to describe the reaction mechanism of liquid-phase catalytic hydrogenation of mono - and disaccharides.

scholarly journals Physical and chemical study of lattice kaolinites and their interaction with orthophosphate

2017 ◽  
Vol 89 (3) ◽  
pp. 1391-1401 ◽  
Author(s):  
MARCONDES SILVA E SILVA ◽  
ANDERSON S. LAGES ◽  
GENILSON P. SANTANA
Keyword(s):  
Chemical Study ◽  
Physical And Chemical

scholarly journals INFLUENCE OF NANO-STRUCTURAL SAPROEL ON THE LIVING WEIGHT OF THE GOES AND THE QUALITY OF THEIR MEAT

2021 ◽  
Vol 245 (1) ◽  
pp. 6-9
Author(s):  
I.F. Alimov ◽  
◽  
Keyword(s):  
Dry Matter ◽  
Live Weight ◽  
Chemical Study ◽  
Feed Additives ◽  
Feed Additive ◽  
Meat Productivity ◽  
Cadmium And Lead ◽  
Physical And Chemical

The article shows that the use of nanostructured sapropel in the form of feed additives in doses of 0.5-1.5 % to the dry matter of feed during the cultivation of geese contributes to an in-crease in their live weight by 7.9-11.1 % in comparison with control analogues. Also, the use of nanostructured sapropel as a feed additive at a dose of 1.0 % in the cultivation of geese showed the best results for increasing meat productivity. A physical and chemical study showed that the content corresponded to the required standards of cadmium and lead.

scholarly journals A physical and chemical study of milo and feterita kernels /

1922 ◽  
Author(s):  
George Leslie Bidwell ◽  
Leslie E. Bopst ◽  
J. D. Bowling
Keyword(s):  
Chemical Study ◽  
Physical And Chemical

Physical and chemical study of coated Candida cylindracea with sorbitan esters

2021 ◽  
Vol 25 (10) ◽  
pp. 43-48
Author(s):  
Nacer Rezgui ◽  
Chahra Bidjou-Haiour
Keyword(s):  
Chemical Study ◽  
Enzymatic Esterification ◽  
X Ray Diffraction ◽  
Candida Cylindracea ◽  
Candida Cylindracea Lipase ◽  
Modified Lipase ◽  
Sorbitan Esters ◽  
Diffraction Patterns ◽  
Span 60 ◽  
Physical And Chemical

A new effective biocatalyst was prepared by coating lipase from Candida cylindracea with sorbitan esters such as span 60 and 65. This biocatalyst was characterized by employing the Scanning Electron Microscopy, X-Ray diffraction patterns and a lipase assay. The type of surfactant used during the lipase modification process has shown significant effect in the lipase activity and the protein content of the modified lipase complex. It was found that catalytic behavior of modified lipase was greatly affected by the source of the used span. Span 65-coated Candida cylindracea lipase showed the highest conversion of 50% in enzymatic esterification of glucose and lauric acid.

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