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Wyświetlanie 1-15 z 31
Tytuł:
Determination of bee spacing and comb cell dimension for Apis mellifera scutellata races across different agroecology in western Ethiopia
Autorzy:
Kidie, Habtie Arega
Alebel, Mezgebu Getnet
Powiązania:
https://bibliotekanauki.pl/articles/1075649.pdf
Data publikacji:
2019
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Apis mellifera scutellata
bee space
cell depth
cell diameter
comb thickness
hive dimension
Opis:
This investigation was done at Wombera and Pawe study areas of Metekel zone of Benishangul-gumuz regional state, western Ethiopia, with the aim of determine the bee spacing and cell dimensions and recommended an appropriate bee spacing and cell dimension for Apis mellifera scutellata. Wombera and Pawe study areas were selected to represent highland and lowland agro-ecologies respectively. The measurement of bee space, cell diameter, cell depth, comb thickness and hive dimension were taken from 20 traditional hives at each agro-ecology by using caliper to 0.1mm accuracy. Collected data were analyzed in descriptive statistics, correlation and General Linear Model (GLM) procedures using statistical package for social sciences (SPSS) software. The current study overall mean results of bee space, cell depth, cell diameter and comb thickness were 16.5 ±0.5 mm, 10.4 ±0.06 mm, 4.68 ±0.03 mm, and 19.9 ±0.14 mm respectively. The hive width and length were 27.1 ±0.5 cm and 76.5 ±0.9 cm respectively. The results of bee space and comb thickness showed significance difference among districts (P < 0.05), whereas cell depth, cell diameter, hive length and hive width were not difference among districts (P > 0.05). Therefore, there were difference in bee space and comb thickness in similar honeybee race among two different agroecology but preparing of new casting molds and box hives consistent to the agroecology.
Źródło:
World Scientific News; 2019, 125; 230-238
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Bacilli bacterial cell image analysis using active contour segmentation with SVM classifier
Autorzy:
Bannigidad, Parashuram
Powiązania:
https://bibliotekanauki.pl/articles/1062913.pdf
Data publikacji:
2019
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Active contour method
Bacillus
Bacillus subtilis
Bacterial cell image analysis
Cell classification
Cocobacilli
Diplobacilli
Palisades
SVM
Segmentation
Streptobacilli
Opis:
The main aim of the present study is to develop an automatic method to identify and classify the different cell types of bacilli bacterial cells in digital microscopic cell images using active contour method. Snakes, or active contours, are used widely in computer vision and machine learning applications, particularly to locate object boundaries. GLCM, HOG and LBP features are used to identify the arrangement of bacilli bacterial cells, namely, bacillus, cocobacilli, diplobacilli, palisades and streptobacilli using SVM classifier. The current methods rely on the subjective reading of profiles by a human expert based on the various manual staining methods. In this paper, it is proposed a method for bacilli bacterial cell classification by segmenting digital bacterial cell images using active contour model and extracting GLCM, HOG and LBP features. The experimental results proves that, the SVM classifier has yielded an overall accuracy of 97.2% with GLCM features, HOG features has yielded an accuracy of 74.8% and LBP features yielded 91.2% accuracy. The GLCM features with SVM classifier has got good classification results compared to HOG and LBP feature sets for bacilli bacteria cell types.
Źródło:
World Scientific News; 2019, 127, 3; 369-376
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Electricity Generation & Other Applications using Microbial Fuel Cell
Autorzy:
Bose, Amarnath
Bose, Debajyoti
Powiązania:
https://bibliotekanauki.pl/articles/1192994.pdf
Data publikacji:
2016
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Electricity Generation
microbial fuel cell
organics
power
soil
Opis:
A Microbial Fuel Cell is a device where the bacteria can grow on one electrode, they breakdown organic matter and release electrons from it. The bacteria can do this by keeping them separate from the oxygen, and when they release those electrons it creates a potential between the two electrodes of about half a volt and voltage times current is power, and that is how power is generated from it. But MFCs are not restricted to generating power they can also be used to produce biofuels. Process can also be used to extract hydrogen and methane using appropriate membrane between the anode and cathode. Given paper explores this spectrum of scenarios and speculates the possibility of generating power using the Himalayan top soil.
Źródło:
World Scientific News; 2016, 39; 17-30
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Novel potential anticancer agents
Autorzy:
Jęśkowiak, Izabela
Ryng, Stanisław
Powiązania:
https://bibliotekanauki.pl/articles/1178224.pdf
Data publikacji:
2018
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
anticancer agents
carcinoma cell lines
drug design
Opis:
Cancer is a widespread and lethal disease. It is considered as the first leading cause of deaths in economically developed countries. Nonetheless, the search for an effective treatment of cancer is still a major challenge. In this review, we analyzed the core structure of compounds and their impact on antitumor activity. Diversity of heterocyclic ring in the innovatory anticancer substances showed the potential in the design and development of new anticancer drugs.
Źródło:
World Scientific News; 2018, 93; 40-49
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Protonic Ceramic Fuel Cells as novel electrochemical devices
Autorzy:
Winiarz, Piotr
Mielewczyk-Gryń, Aleksandra
Wachowski, Sebastian
Gazda, Maria
Powiązania:
https://bibliotekanauki.pl/articles/1179561.pdf
Data publikacji:
2017
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Electrical energy demand
fuel cell
protonic conductors
Opis:
Proton ceramic conductors are novel materials which are interesting from the application point of view. For example, Protonic Ceramic Fuel Cells (PCFCs) is a type of a solid oxide fuel cell, which uses proton ceramic conductors as an electrolyte. Scientists are looking for the most efficient materials for these devices. In recent years main focus has been put on the search for new proton and mixed proton-electron conductors which could be applied as electrolytes or electrodes.
Źródło:
World Scientific News; 2017, 75; 56-63
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Significant Influence of Annealing Temperature and Thickness of Electrode on Energy Conversion Efficiency of Dye Sensitized Solar Cell: Effect of Catalyst
Autorzy:
Uddin, J.
Islam, J. M. M.
Khan, S. M. M.
Hoque, E.
Khan, M. A.
Powiązania:
https://bibliotekanauki.pl/articles/412298.pdf
Data publikacji:
2014
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Dye Sensitized Solar Cell
sensitizer
catalyst
annealing temperature
thickness
Opis:
Dye sensitized solar cell (DSSC) shows great promise as an alternative to conventional p-n junction solar cells due to their low fabrication cost and reasonably high efficiency. DSSC was assembled by using natural dye extracted from red amaranth (Amaranthus Gangeticus) as a sensitizer and different catalysts for counter electrode were applied for maximum energy conversion efficiency. Annealing temperature and thickness of electrode were also investigated and optimized. Catalyst, annealing temperature and thickness were optimized by the determination of cell performance considering photoelectrochemical output and measuring current and voltage; then calculating efficiency and other electrical parameters. The experimental results indicated that samples having 40 μm electrode thickness and prepared at 450 o C annealing temperature showed the best performance.
Źródło:
International Letters of Chemistry, Physics and Astronomy; 2014, 20, 1; 78-87
2299-3843
Pojawia się w:
International Letters of Chemistry, Physics and Astronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Cadmium effects on growth and photosynthetic pigment content of Chaetoceros gracilis
Autorzy:
Ferdian, Ferdian
Hindarti, Dwi
Permana, Rega
Powiązania:
https://bibliotekanauki.pl/articles/1030841.pdf
Data publikacji:
2020
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Carotenoids
Cell density
Chaetoceros gracilis
Chlorophyll-a
Toxicity test
Opis:
Cadmium wastewater released by human activities will eventually enter the aquatic environment. Living organism that lives around could potentially exposed by these cadmium, including C. gracilis which play a critical role as a primary producer. Cadmium can reduce the growth rate and pigment content in C. gracilis. Therefore, toxicity testing becomes important to do considering that C. gracilis has many benefits such as shrimp feed and have active compounds for antibacterial and biodiesel. Toxicity test was performed in 96-hours with a series of concentration 0, 0.56, 1.0, 1.8, 3.2, 5.6 mg/L. IC50 cadmium results in concentrated cell density and chlorophyll-a C. gracilis were 1.62 mg/L and 3.4 mg/L, while carotenoids were not in accordance with the contribution of cadmium. NOEC and cadmium LOEC to C. gracilis cell density were 0.56 mg/L and 1.0 mg/L.
Źródło:
World Scientific News; 2020, 145; 245-255
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Applications of Arthrospira platensis as an Alternative Source of Food, Maintaining Nutritional Security and Awareness Creation; there by Reducing Problems of Malnutrition in the Society
Autorzy:
Degnechew, Genene Demisu
Buzayehu, Desisa Benti
Powiązania:
https://bibliotekanauki.pl/articles/1111949.pdf
Data publikacji:
2018
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Antioxidant
Arthrospira platensis
Cyanobacteria
Malnutrition
Single cell protein
Opis:
An increase in population has led to explorations of alternative sources of food, nutrition and energy. This search and the maintenance of nutritional security are essential dimensions of sustainable communal growth and development. This study revises evidences for alternative food production from Arthrospira platensis. The use of Arthrospira platensis for food is increasingly relevant as its components (proteins, lipids, minerals and vitamins) have substantial potential to be competitive with the same components from other food sources, and Arthrospira platensis-based food production is relatively low in price and holds medicinal properties.
Źródło:
World News of Natural Sciences; 2018, 19; 1-8
2543-5426
Pojawia się w:
World News of Natural Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Plummer Vinson Syndrome (PVS) with parotid gland squamous cell carcinoma in a young female
Autorzy:
Prasada, Swamy T.
Prasad, Vangala Bramha
Srividya, Lonkala
Powiązania:
https://bibliotekanauki.pl/articles/1112557.pdf
Data publikacji:
2018
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Anaemia
Dysphagia
Plummer Vinson syndrome
Salivary gland
Squamous cell carcinoma
Opis:
Plummer Vinson syndrome, also known as ‘Paterson Brown-Kelly’ syndrome is a syndrome associated with the triad of symptoms comprising microcytic hypochromic anaemia, oesophageal strictures and dysphagia. PVS (Plummer Vinson Syndrome) is commonly found in women of middle age especially in the fourth and fifth decade of life and is rarely reported in males and young females. Symptoms resulting from anaemia predominate the clinical picture, apart from additional features such as glossitis, angular cheilitis, and dysphagia. Dysphagia, however, is the main clinical feature of PVS. PVS carries an increased risk of development of squamous cell carcinoma of oesophagus and pharynx[1]. A classic case report of PVS associated with swelling of the salivary gland with clinical features, oral manifestations, malignant potential, differential diagnosis, investigation, and treatment is discussed here. This article carries the message that oral and pharyngeal manifestations should be considered to rule out malignancy in PVS, moreover, that PVS increases the risk factor of salivary gland squamous cell carcinoma. Early identification and diagnosis improves the prognosis and better chances of survival. We have to be familiar, therefore, with the oral manifestations of anaemia and be able to suspect PVS to aid in early diagnosis and prompt treatment. This case study was taken from Medcare hospital, Karimnagar, Telangana.
Źródło:
World News of Natural Sciences; 2018, 18, 2; 171-179
2543-5426
Pojawia się w:
World News of Natural Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fabrication and Characterization of ZnO/p-Si Heterojunction Solar Cell
Autorzy:
Habubi, Nadir F.
Mousa, Abdulazeez O.
Powiązania:
https://bibliotekanauki.pl/articles/1193961.pdf
Data publikacji:
2015
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
chemical spray pyrolysis
heterojunction solar cell
n-ZnO/p-Si
Opis:
Zinc oxide thin films was deposited by chemical spray pyrolysis (CSP) at 400 °C substrate temperature and different thickness (60, 80, and 100) nm on the texturized p-Si wafer to fabricate ZnO/p-Si heterojunction solar cell. Structural, optical, electrical and photovoltaic properties are investigated for the samples. XRD analysis reveals that all the as deposited ZnO films show polycrystalline structure, without any change due to increase of thickness. Average diameter calculated from AFM images shows an increase in its value with increasing thickness, ranging from 59.82-95.7 nm. The optical reflections for samples are measured using UV-Vis spectrophotometer. Photoluminescence (PL) spectra of (CSP) grown ZnO/p-Si with different thickness were used to study the energy gap. The electrical properties of heterojunction were obtained by I-V (dark and illuminated) and C-V measurement. I-V characteristic of the ZnO/p-Si heterojunction shows good rectifying behavior under dark condition. The ideality factor and the saturation current density was calculated. Under illuminated the photovoltaic measurements (open-circuit voltage (Voc), short-circuit current density (JSC), fill factor (FF), and quantum efficiencies are calculated for all samples. The built- in potential (Vbi), carrier concentration and depletion width are determined under different thickness from C-V measurement.
Źródło:
World Scientific News; 2015, 18; 78-92
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The energy harvesting from waste heat
Autorzy:
Kardasz, P.
Wróbel, R.
Doskocz, J.
Wiejkut, P.
Powiązania:
https://bibliotekanauki.pl/articles/1189724.pdf
Data publikacji:
2016
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
waste heat harvesting
thermoelectric effect
thermoelectric generators
a Peltier cell
Opis:
The article focuses on the use of thermoelectrics for the energy harvesting from waste heat. There were discussed the thermoelectric effects and the solutions of converting the waste heat into electricity were shown. The application and operation of thermoelectrics for heat recovery from cars, the cogeneration of heat for home and in wristwatches were presented. An analysis of the possibilities of using Peltier cells in municipal and long-distance transport was conducted. The aim of the study was to evaluate the possibility of reducing fuel costs by obtaining electricity from the Peltier cells instead of the alternator. The efficiency tests of operation the Peltier cells were carried out. On their basis was possible to determine the amount of recovered energy thanks to their use. On the basis of calculations it was concluded that at the current price of unit cell, the use of this solution is not fully economically justifiable. However, there are possible solutions that could increase the efficiency of the cell. The advantages of using cells is reducing the vehicle engine wear and emission of harmful substances into the environment. It was found that most justifiable is the mounting of cells in vehicles equipped with multiple electrical receivers with low efficiency of the engine. It was indicated that more and more new thermoelectric materials that provide efficient and cheap energy harvesting on a large scale are looking for. In Google Patents and Espacenet are posted many solutions of waste heat recovery, which indicates that this field is constantly evolving.
Źródło:
World Scientific News; 2016, 48; 133-148
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Cancer Cell Plasma Membrane Potentials As Energetic Equivalents to Astrophysical Properties
Autorzy:
Persinger, M. A.
Lafrenie, R. M.
Powiązania:
https://bibliotekanauki.pl/articles/411648.pdf
Data publikacji:
2014
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
kT boundary
magnetic energy
cancer cell
entropy
noise band
Hubble's parameter
Opis:
The primary physical and chemical parameters that define the hypopolarized plasma cell membrane of malignant (cancer) cells compared to non-malignant cells reflect universal characteristics. The median value for the resting membrane potential is the constant for the Nernst equation without reference to discrepancies in ion concentrations and is identical to Boltzmann energies at 37 °C. The threshold energy defining space-time converges with access to entropic processes that are reflected in the morphology of cancer cells and tumors. Slowing of growth in cancer cell lines but not normal cells following exposure to weak (~1 to 10 μT) patterned magnetic fields occurs when the energy induced within the cell corresponds to the energy equivalent of the hypopolarized membrane potential. The optimal temporal parameters for the efficacy of these fields can be derived from Hubble‟s parameter and the transform function for “noise” or “random” patterns within the system. Quantitative solutions and experimental data indicate that the cancer cell may be dominated by entropic process that can be attenuated or blocked by temporally-structured applied magnetic fields whose intensity matches the increment of energy associated with this threshold.
Źródło:
International Letters of Chemistry, Physics and Astronomy; 2014, 17, 1; 67-77
2299-3843
Pojawia się w:
International Letters of Chemistry, Physics and Astronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Anatomical Features of Lignocellulosic Tissues from Underground Rhizomes of Thaumatococcus daniellii (Benn.) Benth. in a Rainforest Zone of Nigeria
Autorzy:
Erakhrumen, A. A.
Larinde, S. L.
Aronmwan, P. O.
Powiązania:
https://bibliotekanauki.pl/articles/1112447.pdf
Data publikacji:
2018
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Thaumatococcus daniellii
cell wall tissues
photo-impression
rhizomes
transverse / longitudinal planes
Opis:
Published information about anatomical studies of the lignocellulosic material derived from the rhizomes of Thaumatococcus daniellii is almost non-existent, thereby necessitating this current study. This is aimed at examining, microscopically, the anatomical features of the cell wall structure of this plant’s rhizomes. Consequently, rhizomes differentiated into sections, based on the mean height of stalks growing on each section, were harvested in the arboretum of the Department of Forest Resources and Wildlife Management, University of Benin campus, Benin City Nigeria, washed thoroughly with clean water to remove sand from the surface, placed in ethanol, taken to the laboratory and further fixed in increasingly concentrated ethanol for periods ranging from 1 to 3 hours. Using a microtome, thin slices of tissues 30μm thickness were obtained from the different sections along the rhizomes in the cross-sectional transverse and longitudinal planes, stained, mounted on glass slides and dried. Observation of tissues mounted on glass slides, including capturing of photomicrographs, were carried out by employing a photomicroscope at 40X magnification. On analysing the different photomicrographs, we saw that the anatomical features of the cell wall for lignocellulosic tissues from the different parts of the rhizome were similar in preponderance and shape in each of the planes. It is expected that the outcome of this research will contribute to the series of background information needed in utilisation and for further researches that will improve knowledge concerning this lignocellulosic material.
Źródło:
World News of Natural Sciences; 2018, 18, 2; 106-113
2543-5426
Pojawia się w:
World News of Natural Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Higher Solar Cell Efficiency Achieved with ZnO/Si heterojuction
Autorzy:
Ayad, jumaah kadhim
Muneer, H. Jaduaa Alzubaidy
Abd, Ahmed N.
Powiązania:
https://bibliotekanauki.pl/articles/1161880.pdf
Data publikacji:
2018
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
AFM
XRD
ZnO/Si
chemical method
conversation efficiency
solar cell
Opis:
In this work, the zinc oxide nanoparticles were prepared chemically and deposited by casting style on glass bases and treated thermally at a temperature of 600 °C. The study focused on Optical and structural properties of thin films. An optical advantages of Zinc Oxide (ZnO) were characterized by using ultraviolet visible Spectroscopy. And the structure by using X-Ray Diffraction and (AFM). The optical advantages of thin films were studied by recording the transmittance spectra of wavelengths range (300-900 nm). The energy gap was calculated using tauc equation and is found (3 eV). I-V properties of the solar cell under light at 40 mW/cm2 flounce was investigated. The open circuit Voltage (Voc) was 33 and Short-circuit density (Isc) was 0.017 mA. This measurements show that the fill factor (F.F) and conversation efficiency (η), were 55% and 9.9% respectively.
Źródło:
World Scientific News; 2018, 112; 226-234
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Microbial Fuel Cell: Generating Electricity from Organic Waste – A Review
Autorzy:
Mital, Sheetal
Srivastava, Jyoti
Sharma, Akash
Powiązania:
https://bibliotekanauki.pl/articles/1159345.pdf
Data publikacji:
2018
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Clostridium butyricum
Fuel cell
Microbes
Non-renewable energy
Saccharomyces cerevisiae
Substrate
Opis:
In the recent decades, there has been a huge energy demand due to the exponential increase of the human population and consequently, the depletion of non-renewable energy sources. This creates the need to explore alternate routes for renewable energy resources. Recently, the microbial fuel cell (MFC) technology is being considered a promising alternative due to their mild operating conditions and the ability to use variety of biodegradable substrates as fuel. This environment-friendly process converts chemical energy of organic waste into electricity through electroactive microbes. The review covers various aspects like the anodic/cathodic materials and select microbial/enzymatic electrochemical cathodic reactions. The critical review of different classes of wastes that can be employed for bio-energy generation, power output, challenges and the limitations are also described.
Źródło:
World Scientific News; 2018, 113; 64-77
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 31

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