scholarly journals Physical, Chemical and Biological Study of Leaf Extracts from Senna obtusifolia: Bibliographic Review

2021 ◽  
Vol 15 (29) ◽  
pp. 82-90
Author(s):  
Mario Omar Calla Salcedo ◽  
Sheylla Susan Moreira da Silva de Almeida
Keyword(s):  
Biological Study ◽  
Leaf Extracts ◽  
Senna Obtusifolia ◽  
Physical Chemical

scholarly journals Astrochemical Pathways to Complex Organic and Prebiotic Molecules: Experimental Perspectives for In Situ Solid-State Studies

Life ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 568
Author(s):  
Daniele Fulvio ◽  
Alexey Potapov ◽  
Jiao He ◽  
Thomas Henning
Keyword(s):  
Solid State ◽  
Experimental Studies ◽  
Deep Understanding ◽  
Biological Study ◽  
Unique Contribution ◽  
Perspective View ◽  
Interstellar Clouds ◽  
Physical Chemical ◽  
Complex Organic

A deep understanding of the origin of life requires the physical, chemical, and biological study of prebiotic systems and the comprehension of the mechanisms underlying their evolutionary steps. In this context, great attention is paid to the class of interstellar molecules known as “Complex Organic Molecules” (COMs), considered as possible precursors of prebiotic species. Although COMs have already been detected in different astrophysical environments (such as interstellar clouds, protostars, and protoplanetary disks) and in comets, the physical–chemical mechanisms underlying their formation are not yet fully understood. In this framework, a unique contribution comes from laboratory experiments specifically designed to mimic the conditions found in space. We present a review of experimental studies on the formation and evolution of COMs in the solid state, i.e., within ices of astrophysical interest, devoting special attention to the in situ detection and analysis techniques commonly used in laboratory astrochemistry. We discuss their main strengths and weaknesses and provide a perspective view on novel techniques, which may help in overcoming the current experimental challenges.

Transmission Electron Microscopy of Protein Macromolecules

1971 ◽  
Vol 29 ◽  
pp. 424-425
Author(s):  
Henry S. Slayter
Keyword(s):  
Biological Systems ◽  
Metal Vapor ◽  
Resolving Power ◽  
Electron Microscopic ◽  
Chemical Methods ◽  
Molecular Weights ◽  
The Past ◽  
Physical Chemical ◽  
Transmission Electron

Electron microscopic methods have been applied increasingly during the past fifteen years, to problems in structural molecular biology. Used in conjunction with physical chemical methods and/or Fourier methods of analysis, they constitute powerful tools for determining sizes, shapes and modes of aggregation of biopolymers with molecular weights greater than 50, 000. However, the application of the e.m. to the determination of very fine structure approaching the limit of instrumental resolving power in biological systems has not been productive, due to various difficulties such as the destructive effects of dehydration, damage to the specimen by the electron beam, and lack of adequate and specific contrast. One of the most satisfactory methods for contrasting individual macromolecules involves the deposition of heavy metal vapor upon the specimen. We have investigated this process, and present here what we believe to be the more important considerations for optimizing it. Results of the application of these methods to several biological systems including muscle proteins, fibrinogen, ribosomes and chromatin will be discussed.

Seeking to uncover biology's chemical roots

2019 ◽  
Vol 3 (5) ◽  
pp. 435-443 ◽  
Author(s):  
Addy Pross
Keyword(s):  
Environmental Changes ◽  
Biological Systems ◽  
Significant Development ◽  
The Road ◽  
Physical Chemical ◽  
Systems Chemistry ◽  
Biological World ◽  
Inanimate Matter ◽  
The Origin Of Life ◽  
Opening Up

Despite the considerable advances in molecular biology over the past several decades, the nature of the physical–chemical process by which inanimate matter become transformed into simplest life remains elusive. In this review, we describe recent advances in a relatively new area of chemistry, systems chemistry, which attempts to uncover the physical–chemical principles underlying that remarkable transformation. A significant development has been the discovery that within the space of chemical potentiality there exists a largely unexplored kinetic domain which could be termed dynamic kinetic chemistry. Our analysis suggests that all biological systems and associated sub-systems belong to this distinct domain, thereby facilitating the placement of biological systems within a coherent physical/chemical framework. That discovery offers new insights into the origin of life process, as well as opening the door toward the preparation of active materials able to self-heal, adapt to environmental changes, even communicate, mimicking what transpires routinely in the biological world. The road to simplest proto-life appears to be opening up.

Anti-plaque activity of Piper betle leaf extracts

Planta Medica ◽  
2010 ◽  
Vol 76 (12) ◽  
Author(s):  
N Pandita ◽  
A Varghese ◽  
M Mantri ◽  
Y Kachwala
Keyword(s):  
Piper Betle ◽  
Leaf Extracts

Antimicrobial Activity of the Seed Kernel and Leaf Extracts of Mangifera indica L. (Fam. Anacardiaceae) Against Escherichia coli

Planta Medica ◽  
2013 ◽  
Vol 79 (05) ◽  
Author(s):  
ADC Abergas ◽  
MCQ Aleria ◽  
ZJS Alimagno ◽  
KNC Batac ◽  
AFM De Lara ◽  
...  
Keyword(s):  
Escherichia Coli ◽  
Antimicrobial Activity ◽  
Mangifera Indica ◽  
Seed Kernel ◽  
Leaf Extracts

Quantitative HPLC analysis of chamuangone in Garcinia cowa leaf extracts

Planta Medica ◽  
2013 ◽  
Vol 79 (13) ◽  
Author(s):  
P Panichayupakaranant ◽  
A Sakunpak
Keyword(s):  
Hplc Analysis ◽  
Leaf Extracts ◽  
Garcinia Cowa ◽  
Quantitative Hplc Analysis ◽  
Quantitative Hplc
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