Nisha"s Blog

Search This Blog

Particulate nature of Matter II Chapter 7 II Class 8 II Curiosity Book II Latest Summary notes II

on May 03, 2026 curiosity class 8

0

Get link
Facebook
X
Pinterest
Email
Other Apps

Structure of Volvox- Green Algae

on June 23, 2024

Get link
Facebook
X
Pinterest
Email
Other Apps

Systematic Position:

Distribution of Volvox:

Structure:

Get link
Facebook
X
Pinterest
Email
Other Apps

Comments

Extraction, analysis and quantification of plant hormones

Plant Hormone extraction, analysis, and quantitation * Hormone extraction and identification has been made possible due to advances in chemical analysis, chromatographic techniques, and mass spectrometry. * It is difficult to extract and identify plant hormone from plant extract as the extract contains major metabolites, such as sucrose, also hormones concentrations in plant tissues are low up to more than ten times compared to other material in plant tissue. * Another thing that effects identification and extraction is the complexity in structure of plant hormones. * Chemical properties of phytohormone also effect hormone analysis, quantification and extraction. * Wide range of chemical properties, many hormones (e.g., gibberellic acid and brassinosteroids) are quite hydrophobic, while hormones like auxins and cytokinins are more hydrophilic. * Keeping the diversity of solubility, Structure and chemical nature in view, tissue homogenates are subjected to “clean up” or enrichment met...

Cryopreservation

Cryopreservation is a conservation method that allows the long-term storage of samples at low temperature up-to -196C making sure that it does not affects cell's viability. It is an important and efficient method for preservation of world's genetic resources. It allows long term conservation of biological material Its simplicity and applicability make it an efficient method. The plant material stored can be- Seed, Shoot tip, Zygotic embryo, somatic embryo, Pollens, different types of plant cells, tissue and organs. Various means for storage at low temperature: At -79°C over solid CO2 At-80 °C in Deep Freezers At -150 °C in Vapor phase At -196 °C in Liquid Nitrogen These varying temperatures are also called as Sub-Zero temperature. PRINCIPLE The Sub-Zero temperature (below0 °C) makes the cells suspended due to slow down of biological reactions including metabolism, cellular transport, division etc. The cells remain in this suspended state until the temperature is restored. This...

Engler and Prantl classification system: History, Outline of Classification, Merit and Demerits of classification II With MCQ II Botany-Biology

Engler and Prant system of classification Type of system of classification: Phylogenetic system of classification History background: Heinrich Gustav Adolf Engler (1844-1930), Professor of Botany, University of Berlin, Germany, proposed a phylogenetic system of classification in a book entitled Syllabus (1892). Soon after, Engler in collaboration with Karl Anton Prantl another German Botanist, published a monumental work entitled “ Die-Natürlichen Pflanzenfamilien” (1887-1915) having 23volumes , Hans Melchior published the revised (13th) edition of Syllabus in 1964 with a number of modifications in this system. Outline of the classification: The Englar and Prantl system often considered as phylogenetic one was not strictly phylogenetically in modern sense as it was an arrangement in linear sequence starting with simplest group in order of increasing complexity. The work includes key and description of all known genera of plants. As a whole 303 families of...

Powered by Blogger