نتایج جستجو برای: hierarchical cluster analysis hca

تعداد نتایج: 2989843  

Journal: :Separations 2022

Cuscutae Semen (CS; Chinese common name “Tusizi”) is one of the most traditional herbal medicines used to treat liver and kidney diseases in China. Although it commonly as a processed product, little progress has been made on quality control CS salt-processed (PCS). The purpose this study was establish comprehensive strategy integrating chromatographic analysis chemometric methods for evaluatio...

Journal: :Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy 2021

Condom residues may be encountered in forensic investigations as traces left sexual assault or rape cases. Considering casework samples analysis, where material from swabs will need to extracted, Diffuse Reflectance Infrared Fourier Transform Spectroscopy (DRIFTS) was reported the most relevant method for trace evidence analysis. However, there has been no study identify which specific paramete...

Journal: :Jurnal teknologi 2023

Propolis is a natural substance produced by the bees to protect their hive. The present work reports utilization of chemical profiling and fingerprinting combined with multivariate analysis for discrimination geographical origin Malaysian stingless bee propolis. High Performance Thin Layer Chromatography (HPTLC) has been performed profile composition Geniotrigona thoracica propolis from differe...

Journal: :Separations 2022

Chestnut (Castanea sativa Mill.), a valuable fruit crop, is cultivated in small areas Romania, mostly the west, where moderate continental climate has slight Mediterranean influence. This work aims to investigate bioactive characteristics (total polyphenols, total flavonoids and antioxidant activity), individual polyphenolic composition, phytochemical nutritional HRMS screening profiles, sugar ...

Journal: :Journal of bacteriology 1998
E Díaz A Ferrández J L García

We have identified, cloned, and sequenced the hca cluster encoding the dioxygenolytic pathway for initial catabolism of 3-phenylpropionic acid (PP) in Escherichia coli K-12. This cluster maps at min 57.5 of the chromosome and is composed of five catabolic genes arranged as a putative operon (hcaA1A2CBD) and two additional genes transcribed in the opposite direction that encode a potential perme...

 In this study the quality of Omani and United Arab Emirates bottled water brands which are sold in Oman were assessed by comparing the chemical composition indicated on manufacturer’s label with local and international bottled water standards. Results indicated that all the bottled water brands are complying with local and international standards. According to piper diagram, t...

Journal: :Agronomy 2022

The constraints associated with peat use in horticulture has led to a search for alternative materials their as growing media. organic derived from palm trees (composted or not) can constitute an due ligneous and fibrous character, similar coir fiber. This work studies the feasibility of using several palm-tree-derived (Phoenix dactylifera L.) media ingredients transplant production lettuce (La...

2014
A. Mart'inez-P'erez

In the election of a hierarchical clustering method, theoretic properties may give some insight to determine which method is the most suitable to treat a clustering problem. Herein, we study some basic properties of two hierarchical clustering methods: α-unchaining single linkage or SL(α) and a modified version of this one, SL∗(α). We compare the results with the properties satisfied by the cla...

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