scholarly journals Accumulation of 2-C-methyl-d-erythritol 2,4-cyclodiphosphate in illuminated plant leaves at supraoptimal temperatures reveals a bottleneck of the prokaryotic methylerythritol 4-phosphate pathway of isoprenoid biosynthesis

2009 ◽  
Vol 32 (1) ◽  
pp. 82-92 ◽  
Author(s):  
CORINNE RIVASSEAU ◽  
MYRIAM SEEMANN ◽  
ANNE-MARIE BOISSON ◽  
PETER STREB ◽  
ELISABETH GOUT ◽  
...  
Keyword(s):  
Isoprenoid Biosynthesis ◽  
Plant Leaves ◽  
Supraoptimal Temperatures

Ectodesmata as Revealed By Freeze-Etch Preparations of Plant Epidermal Cell Walls

1973 ◽  
Vol 31 ◽  
pp. 468-469
Author(s):  
N.C. Lyon ◽  
W. C. Mueller
Keyword(s):  
Electron Microscopy ◽  
Acetic Acid ◽  
Nitric Acid ◽  
Oxalic Acid ◽  
Light Microscopy ◽  
Epidermal Cell ◽  
Cell Walls ◽  
Plant Viruses ◽  
Plant Leaves ◽  
Thin Sections

Schumacher and Halbsguth first demonstrated ectodesmata as pores or channels in the epidermal cell walls in haustoria of Cuscuta odorata L. by light microscopy in tissues fixed in a sublimate fixative (30% ethyl alcohol, 30 ml:glacial acetic acid, 10 ml: 65% nitric acid, 1 ml: 40% formaldehyde, 5 ml: oxalic acid, 2 g: mecuric chloride to saturation 2-3 g). Other workers have published electron micrographs of structures transversing the outer epidermal cell in thin sections of plant leaves that have been interpreted as ectodesmata. Such structures are evident following treatment with Hg++ or Ag+ salts and are only rarely observed by electron microscopy. If ectodesmata exist without such treatment, and are not artefacts, they would afford natural pathways of entry for applied foliar solutions and plant viruses.

Probing the Substrate Promiscuity of Isopentenyl Phosphate Kinase as a Platform for Hemiterpene Analogue Production

2019 ◽  
Author(s):  
Sean Lund ◽  
Taylor Courtney ◽  
Gavin Williams
Keyword(s):  
Synthetic Biology ◽  
Building Blocks ◽  
Isoprenoid Biosynthesis ◽  
Thermoplasma Acidophilum ◽  
Substrate Promiscuity ◽  
Enzymatic Pathways ◽  
First Time ◽  
Rate Limiting ◽  
Alcohol Dependent ◽  
Isopentenyl Phosphate

Isoprenoids are a large class of natural products with wide-ranging applications. Synthetic biology approaches to the manufacture of isoprenoids and their new-to-nature derivatives are limited due to the provision in Nature of just two hemiterpene building blocks for isoprenoid biosynthesis. To address this limitation, artificial chemo-enzymatic pathways such as the alcohol-dependent hemiterpene pathway (ADH) serve to leverage consecutive kinases to convert exogenous alcohols to pyrophosphates that could be coupled to downstream isoprenoid biosynthesis. To be successful, each kinase in this pathway should be permissive of a broad range of substrates. For the first time, we have probed the promiscuity of the second enzyme in the ADH pathway, isopentenyl phosphate kinase from Thermoplasma acidophilum, towards a broad range of acceptor monophosphates. Subsequently, we evaluate the suitability of this enzyme to provide non-natural pyrophosphates and provide a critical first step in characterizing the rate limiting steps in the artificial ADH pathway.<br>

Antipyretic activity of the root extracts of Desmodium Gangeticum

2018 ◽  
Vol 8 (2) ◽  
pp. 20-23
Author(s):  
Raja Sheker K ◽  
Naveen B ◽  
Anil kumar A ◽  
Abhilash G
Keyword(s):  
Gastric Ulcers ◽  
Plant Leaves ◽  
Medical Systems ◽  
Human Race ◽  
Standard Drug ◽  
Root Extracts ◽  
Antipyretic Activity ◽  
Scientific Investigations ◽  
And Control ◽  
Effective Drugs

Fevers are considered as the most important parameters to evaluate and diagnose most of the disease conditions like inflammations, wounds and other infections. There are effective drugs that treat and control the fevers out of which NSAID's are most important ones. They cause notable side effects like gastric ulcers, gastric mucosal perforations etc. which make the use of those drugs limited. Herbs are used to treat various diseases, starting from the evolution of the human race. During this, herbs had been introduced to many types of tests and scientific investigations to prove the activities that herbs possess. The diseases that the herbs are used for are notable in the medical systems like Ayurveda and other systems. The need for the validation of the activities of the herbs and medicinal plants is utmost important these days. The extracts of the plant leaves of Desmodium gangeticum were extracted with ethanol and then investigated for the antipyretic activity in yeast induced pyretic method. The extract was tested in two doses 200 and 400mg/kg. This was found significant when compared to the standard drug.

Development of simple models for agrichemical uptake into plant foliage

2003 ◽  
Vol 56 ◽  
pp. 61-65
Author(s):  
J.A. Zabkiewicz ◽  
W.A. Forster
Keyword(s):  
Vicia Faba ◽  
Initial Dose ◽  
Plant Leaves ◽  
Linear Relationships ◽  
Plant Foliage ◽  
Mass Uptake ◽  
Uptake Mechanisms ◽  
Simple Models

Pesticide uptake into plants is typically reported as percentage uptake of the amount applied but in studies of the mechanism of cuticular penetration this approach has not been helpful It can be shown that relating percentage uptake to initial dose of bentazone applied to Vicia faba foliage cannot provide pertinent relationships that can be used to explain cuticular uptake mechanisms However applying the principles of Ficks Law and using mass or molar quantities does provide excellent linear relationships between mass uptake and initial dose applied Universal equations can be derived that relate dose uptake to initial dose applied onto plant leaves

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