Non-chemical control of Armillaria mellea infection of Prunus persica
Published on: 4th July, 2019
OCLC Number/Unique Identifier: 8186251364
Peaches, Prunus persica were planted as grafted saplings in an avocado orchard previously infested with Armillaria mellea (Vahl) P.Kumm. Trees were planted in large or small holes with or without fresh yardwaste chips added as an amendment and with or without a Trichoderma biocontrol product sprayed into the hole. Trees were monitored for six years -- growth and mortality was tabulated. Six years later 40% of the trees had died from the disease. Trees planted in a large hole were more likely to survive than in a smaller hole (P=0.07) and trees in large holes with fresh organic matter added were the most likely to survive (P=0.04). Trichoderma sprays in the planting hole did not increase survival rates. While growth was initially retarded by adding fresh yardwaste to the hole, in later years none of the treatments affected growth rates.
Avermectins: The promising solution to control plant parasitic nematodes
Published on: 13th September, 2019
OCLC Number/Unique Identifier: 8282451461
Abamectin and emamectin are members of avermectin family which categorized as very effective but in the same time are toxic naturally. Most of products in this family are utilized as pharmaceuticals in both humans & animals and for crop protection. Despite avermectins are having complex chemical structures, but they are produced via synthesis in large scales for commercial use. Plant parasitic nematodes (PPNs) cause severe damages in all parts of their host plants, in addition to yield losses. The available strategies to control PPN include use of insecticides/nematicides but these have proved detrimental to environment and human health. Therefore, this scenario gave an opportunity for the utilization of avermectins (abamectin and emamectin) to control plant parasitic nematodes because of their chemical and biological properties, as well as relative safety. Avermectins have short half-lives and their residues can be eliminated easily through different food processing methods. Both abamectin and emamectin were very effective nematicides which proved capability of reducing PPNs significantly in various crops.
An analysis of wild animals with respect to French Ethics and Law
Published on: 9th May, 2019
OCLC Number/Unique Identifier: 8163878958
Before discussing the crux of the matter, it is important to understand what “wild” signifies and the characteristics that define a wild animal.
As contrasted to domesticated animals, a wild animal can be defined as an animal living freely in his natural habitat, independently of Man. These animals are only exposed to variations in the biological equilibrium, to the imperatives of their genetic program and live in a habitat that gives them the possibility of expressing it themselves.
However, this definition is very narrow as there exist a number of species of wild animals that don’t live freely in their natural habitat. These animals are constrained by Man, who by creating a relationship of dependence, controls them and in turn becomes responsible for their sustenance. In such a situation, their habitat is no more their natural habitat but than which has been imposed on them by Man; such animals are said to be “held in captivity” or even “tamed”.
In short, when talking about law and ethics related to wild animals, there are two things to be taken into account: wild animals that live in the wild and wild animals that live held in captivity by Man.
Development and quality evaluation of Jam from Watermelon (Citrullus Lanatus) and Pawpaw (Carica Papaya) juice
Published on: 28th November, 2017
OCLC Number/Unique Identifier: 7286356937
The seasonal nature of most fruits available in the market coupled with inadequate storage and processing facilities has limited their consumption by majority of the people in the country. Jams made from fruits are good bread spread rather than any other food products because they serve as adequate balance diet and it contains antioxidant such as vitamin C and A which play an important role in preventing cancer, cardiovascular problem and improvement of eyesight. Pawpaw and watermelon fruits have been reported to be nutritive and high in antioxidant properties that can scavenge free radicals, thereby improving the antioxidant status of the body. It is therefore deemed fit to produce jam from these perishable commodities in other to make them available all through the year and as well as adding to varieties of food products. The aqueous extracts of watermelon with pawpaw juice were processed into jam and the physicochemical properties of the jam samples were analysed. The resulting jam samples showed moisture content ranging between 30.60-35.30%, protein 0.40-0.80%, fat 0.20-0.40%, ash 1.20-1.70%, crude fibre 0.10-0.30%, carbohydrate 62.10-67.16%, β-carotene 610-1350µg/100g and ascorbic acid 9.60-15.40mg/100g. The jam samples were found to be very nutritive and high in antimicrobial and antioxidant properties that can scavenge free radicals, thereby can improve the antioxidant status of the body. Sensory evaluation tests showed that the samples were acceptable and compared favourably with the commercial imported brand while sample AA had the highest preference in all the sensory attributes evaluated by the panellists. Microbiological examination also showed that the jam samples had total plate count ranging from 4.10x101 to 2.00 x101 cfu/g, yeast and mould count ranged from 2.10x101 to 1.00 x101cfu/g with no observable coliform count.
Evaluation of Clupeids and Danish fish meal based diets on the growth of African catfish, Clarias gariepinus fingerlings
Published on: 4th December, 2018
OCLC Number/Unique Identifier: 8255863994
Two experimental feeding trials were conducted concurrently to study the growth response of African catfish Clarias gariepinus fingerlings to graded levels (0, 5, 10, 15 or 20%) of clupeids in Danish fish meal (DFM) based diets. Chemical analysis of the DFM and clupeids fish meal (CFM) was carried out. Completely randomized design with triplicated groups of fingerlings were used for both trials in an indoor and out-door concrete tanks for six and twelve weeks respectively. The study aimed at achieving a cost effective fish meal from local aquatic resources (clupeids fish) highly prolific and abundant in Nigeria water bodies to replace foreign fish meal in West Africa Region. A project supported by West African Agricultural Productivity Project (WAAPP) in NIFFR, Nigeria.
The results of proximate, amino acid profile, mineral and fatty acid composition analysis of CFM indicated values which are very close to those of the DFM. The proximate analysis revealed CFM to contain 70.6% crude protein while DFM contains 72%. There were no significant difference between the treatments with respect to final weight, feed consumed, feed conversion ratio, digestibility and survival (P>0.05) although there was significant difference in specific growth rate (P<0.05) with the highest value obtained in the diets with both fish meal at ratio 1:1. There were no significant difference in haematological parameters (P>0.05). However the lymphocytes were high in all the groups which might not be particularly due to the treatments. The high proliferation of the body defence cells by the fish could be a mechanism of survival in the aqua-medium which is likely to be high in microbial load due to waste materials. Feed Cost/Kg for DFM was N260.16 while for CFM was N227.16. The results of chemical analysis and feeding trials indicated positive replacement of the DFM with CFM in fish feeds without negative effect on growth performance
Analysis of factors influencing participation of farm households in watermelon production in some selected local government areas of Sokoto State, Nigeria
Published on: 28th February, 2020
OCLC Number/Unique Identifier: 8930822971
The study analyzed the factors influencing participation of farm households’ in watermelon production in the study areas. Three local government areas out of Sokoto state were purposively selected. Questionnaire was used to collect data. Multistage of sampling techniques were used to arrive at the sample size of 181 farm households’ for the study. Likert scale is used to analyze the level of participation of farm households’, frequency and inferential statistics were used to analyze the data. The findings revealed that (55.8%) of the farm households are within the ages of 25-30 years, majority (96.7%) are male It shows that majority (64.0%) of the farm households participated in watermelon production as a result of higher income generated. Multiple regression analysis result revealed significant relationships between farm household’s participation in watermelon production and their socio-economic characteristics at p < 0.05. The constraints faced by the farm households are storage technology and improved agricultural inputs. Most (63.5%) of the farm households believed that provision of subsidized agricultural inputs and market accessibility are forms of assistance that will encourages farm households to partake in watermelon production. It is recommended that government and donor agencies should encourage farm households’ by providing them with the modern agricultural inputs so as to influence them to participate fully into watermelon production irrespective of their Socio-economic differences.
Natural infection of squash fruits (Cucurbita pepo) by Zucchini Yellow Mosaic potyvirus (ZYMV) in Alexandria governorate
Published on: 20th April, 2020
OCLC Number/Unique Identifier: 8586051082
An isolate of zucchini yellow mosaic virus (ZYMV) was obtained from naturally infected squash fruits were grown in Abees region, Alexandria governorate. Disease symptoms were Showing mosaic, yellowing and blistering and absis symptoms. The identification was based on the symptoms developed on diagnostic hosts and serological reactions with antisera to cucumber mosaic cucumovirus (CMV), watermelon mosaic potyvirus 2 (WMV-2) and ZYMV. Squash fruit isolate of ZYMV was transmitted by Aphis gossypii, Aphis neri and Myzus persicae in non-persistent manner. The virus was purified by ultra-centrifugation and PEG. The purified virus had an ultraviolet absorption spectrum typical of a nucleoprotein with A260/280 and A280/260 being 1.1 and 0.91 respectively. The yield of purified virus was 1.62 mg/100g infected leaf tissues. Specific antiserum was prepared and found to have a titer of 1:409600 as determined by indirect ELISA.
Application of the Pyphagor’s Theorem for Correction of Ki and Ka constants of enzyme inhibition and activation
Published on: 30th October, 2018
OCLC Number/Unique Identifier: 7929240991
The analysis of dependence of the length projection of Li vectors of biparametrical inhibited and activated (La) enzymatic reactions from the length projection of vectors of monoparametrical inhibited and activated enzymatic reactions on the basic σ0 plane in three-dimensional coordinate system, allows to deduct the quadratic forms of equations for the correction of the constants of inhibition (ki) and activation (Ka) of enzymes. Examples of correction of constants are given.
Antifungal activity of epecific plant essential oils against fusarium graminearum
Published on: 31st October, 2020
OCLC Number/Unique Identifier: 8872656156
fusarium graminearum is one of the most popular phytopathogens of cereals worldwide. F. graminearum is the major causal agent of head blight of wheat and barley. Disease-resistant cultivar development, antagonistic microorganism usage and fungicide treatment are the most common strategies in head blight management strategies. However, these methods have some important disadvantages. The use of plant-derived essential oil against F. graminearum seems to be a promising approach due to the recent researches. This review summarizes the potential use of essential oils to fight against F. graminearum.
The Evolutionary Horizons of Social Systems
Published on: 17th January, 2025
This document has been translated from Spanish into English using ChatGPT. While efforts have been made to ensure accuracy and maintain the original meaning, some nuances or interpretations may differ from the source text. For any clarification, please refer to the original document or contact the author.This brief article addresses the concern arising from the accelerated whirlwind of changes of all kinds experienced by our social systems, some of which have a significant evolutionary impact, largely driven by advances in science and technology. Particular interest has emerged in connecting certain properties inherent to the behavior of complex systems far from equilibrium—such as social systems—under the framework of properties currently studied in Complexity Sciences. The article outlines this concern, which is, for now, merely the beginning of what could develop into a groundbreaking investigation. It references laboratory simulation work aimed at understanding the evolutionary horizons of Chile’s social system. The text includes an example of some graphs that illustrate a potential method for detecting and anticipating possible evolutionary horizons of the social system, based on the role played by certain “attractor variables” within the system. However, the research is still exploratory, and this article serves merely as a general description of the initial concern.
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