scholarly journals Productivity and quality of vegetable seed varieties subject to the agrotechnological methods of growing.

2008 ◽  
Vol 0 (2(8)) ◽  
pp. 39-51
Author(s):  
О. Ю. Барабаш ◽  
З. Д. Сич ◽  
Н. В. Котюк ◽  
Н. В. Лещук
Keyword(s):  
Vegetable Seed

scholarly journals VALUE CHAIN ANALYSIS OF VEGETABLE SEED IN WESTERN RUKUM DISTRICT, NEPAL

2020 ◽  
Vol 2 (1) ◽  
pp. 23-27
Author(s):  
Melsan Shresth ◽  
Shiva Chandra Dhakal ◽  
Rishi Ram Kattel ◽  
Susan Parajuli ◽  
Katherine Parker
Keyword(s):  
Value Chain ◽  
Local Level ◽  
Simple Random Sampling ◽  
Quality Standard ◽  
Special Focus ◽  
Vegetable Production ◽  
Essential Information ◽  
Secondary Sources ◽  
Vegetable Seed

The vegetable seed is one of the growing high-value subsectors in Nepal because of the increasing commercialization of vegetable production, the deficit of seed supply, and the rising involvement of different actors at different levels of its value chain. In this context, the present study was designed to analysis the value chain of vegetable seeds with a special focus on the competitiveness of the value chain actors. The study was conducted in Western Rukum, Nepal in 2017. Data from 210 randomly selected vegetable seed producers using simple random sampling, 13 seed traders including seed collectors, seed companies and agro vets, eight enablers as well as information from secondary sources were collected and analyzed by using descriptive statistics. The result showed that even having nine functional vegetable seed marketing channels in the district there was a weak relationship among value chain actors. The actors involved in the production and marketing sides had different areas of interest. The producers were typically interested in access to technical input and market assurance in both price and quantity, on the other hand, the market actors were interested in quality assurance and market-led price fixation. Additionally, the market information was limited to the local level seed traders. In the contrast, networking among local traders was found very strong. However, they were also not sure about the quality of seed produced by farmers and had to wait until the quality test by the seed company to clear their product. The finding of this study indicates farmers should maintain the quality of seed, the seed traders should provide the essential information to producers regarding the price and quality standard that need to be met, and government agencies should increase the extension service on the technical know-how of high yielding varieties based on consumers demand to promote the export of the seeds.

scholarly journals Importance of biological seed treatment to improve vegetables seed quality

2019 ◽  
Vol 34 (01) ◽  
Author(s):  
Pramod Sharma ◽  
Ashok Kumar Thakur ◽  
Sunil A. Nair
Keyword(s):  
Seed Treatment ◽  
Seed Quality ◽  
Biocontrol Agents ◽  
Seed Treatments ◽  
Beneficial Microbes ◽  
Crop Establishment ◽  
Vegetable Seed

Seed treatment with beneficial microbes or biocontrol agents is called biological seed treatment. Vegetable seed quality includes the physical, pathological, genetic and physiological that leads to successful crop establishment and yield . Use of BCA’s as seed treatments can play an important role in most aspects of seed quality, and be of particular benefit for improved seeding growth under stressful conditions. It not only improve the quality of seed but also protect seed from different seed borne diseases and make the seed healthy.

Application of instrumental methods for analysisof vegetable seed quality

2020 ◽  
Author(s):  
F. B. Musaev ◽  
◽  
M.S. Antoshkina ◽  
N.N. Potrakhov ◽  
A.V. Goncharov
Keyword(s):  
Seed Quality ◽  
X Ray ◽  
Vegetable Seed ◽  
Instrumental Methods

The article presents the features of the application of instrumental methods for analyzing the quality of vegetable seeds. The technique of X-ray analysis of the quality of vegetable seeds, developed on the basis of studying 25 species belonging to 10 botanical families, is presented.

scholarly journals Seed production of new tomato varieties for multi circle hydroponics: first steps

2020 ◽  
pp. 29-34
Author(s):  
I. T. Balashova ◽  
S. M. Sirota ◽  
E. V. Pinchuk ◽  
N. P. Vershinina ◽  
S. P. Sivochenko
Keyword(s):  
Seed Production ◽  
Seed Quality ◽  
Dispersion Analysis ◽  
Seed Productivity ◽  
Tomato Seeds ◽  
Vegetable Seed ◽  
Different Types ◽  
Negative Effect ◽  
New Varieties

Relevance. Vegetable seed production is a key step in using of new varieties/hybrids in agriculture. The main problem of vegetable seed production is the negative effect of environment to the seed productivity of plants and seeds quality. Usually, vegetable seeds produce in greenhouses in Russia, but special greenhouses are necessary for the obtaining of qualitative seeds. Possibilities different types of greenhouses for seed production of new special tomato varieties for multi circle hydroponics have been studied at this paper.Materials and methods. Materials of study: plants, fruits and seeds of two new tomato varieties Natasha and Timosha. Influence type of plants cultivation on the yield, plant productivity, the middle mass of the fruit and seeds quality have been studied at the two factorial experiment, which has been carried out with help of random repetitions method with 4 repeats. Seed quality has been evaluated by GOST 32 592-2013. Experimental data have been calculated with dispersion analysis by B.A. Dospekhov (1985).Results. It has been established, that the environment of “Rishel” greenhouse (France firm “Rishel”) with polycarbonate cover is optimal for the seed production of new tomato varieties Natasha and Timosha for multi circle hydroponics. The productivity and the yield of seed’s plants were significantly higher in “Rishel” greenhouse, than in the usual greenhouse. The middle mass of one fruit at the plant was significantly higher too. The quality of seeds was in accordance to GOST 32 592-2013 for qualitative tomato seeds (2014).

Immunoferritin localization of intracellular antigens in positively stained frozen sections

1978 ◽  
Vol 36 (2) ◽  
pp. 168-169
Author(s):  
K. T. Tokuyasu
Keyword(s):  
Surface Tension ◽  
Water Surface ◽  
Thin Layers ◽  
The Other ◽  
Positive Staining ◽  
Frozen Sections ◽  
The Past ◽  
Ultrathin Frozen Sections ◽  
Definition Of

During the past investigations of immunoferritin localization of intracellular antigens in ultrathin frozen sections, we found that the degree of negative staining required to delineate u1trastructural details was often too dense for the recognition of ferritin particles. The quality of positive staining of ultrathin frozen sections, on the other hand, has generally been far inferior to that attainable in conventional plastic embedded sections, particularly in the definition of membranes. As we discussed before, a main cause of this difficulty seemed to be the vulnerability of frozen sections to the damaging effects of air-water surface tension at the time of drying of the sections.Indeed, we found that the quality of positive staining is greatly improved when positively stained frozen sections are protected against the effects of surface tension by embedding them in thin layers of mechanically stable materials at the time of drying (unpublished).

Lithography below 100 nm

1983 ◽  
Vol 41 ◽  
pp. 96-99
Author(s):  
L. D. Jackel
Keyword(s):  
Spatial Distribution ◽  
Electron Beam ◽  
Electron Scattering ◽  
Electron Beam Lithography ◽  
Substrate Material ◽  
Local Electron ◽  
Electron Dose ◽  
Positive Resist ◽  
Exposure Process

Most production electron beam lithography systems can pattern minimum features a few tenths of a micron across. Linewidth in these systems is usually limited by the quality of the exposing beam and by electron scattering in the resist and substrate. By using a smaller spot along with exposure techniques that minimize scattering and its effects, laboratory e-beam lithography systems can now make features hundredths of a micron wide on standard substrate material. This talk will outline sane of these high- resolution e-beam lithography techniques.We first consider parameters of the exposure process that limit resolution in organic resists. For concreteness suppose that we have a “positive” resist in which exposing electrons break bonds in the resist molecules thus increasing the exposed resist's solubility in a developer. Ihe attainable resolution is obviously limited by the overall width of the exposing beam, but the spatial distribution of the beam intensity, the beam “profile” , also contributes to the resolution. Depending on the local electron dose, more or less resist bonds are broken resulting in slower or faster dissolution in the developer.

Convergent Beam Electron Diffraction

1978 ◽  
Vol 36 (3) ◽  
pp. 304-315
Author(s):  
G. Lehmpfuhl
Keyword(s):  
Electron Diffraction ◽  
Diffraction Pattern ◽  
Crystal Surface ◽  
Diffraction Spot ◽  
Crystal Thickness ◽  
Large Area ◽  
Electron Microscopic ◽  
Additional Information ◽  
Microscopic Investigations

Introduction In electron microscopic investigations of crystalline specimens the direct observation of the electron diffraction pattern gives additional information about the specimen. The quality of this information depends on the quality of the crystals or the crystal area contributing to the diffraction pattern. By selected area diffraction in a conventional electron microscope, specimen areas as small as 1 µ in diameter can be investigated. It is well known that crystal areas of that size which must be thin enough (in the order of 1000 Å) for electron microscopic investigations are normally somewhat distorted by bending, or they are not homogeneous. Furthermore, the crystal surface is not well defined over such a large area. These are facts which cause reduction of information in the diffraction pattern. The intensity of a diffraction spot, for example, depends on the crystal thickness. If the thickness is not uniform over the investigated area, one observes an averaged intensity, so that the intensity distribution in the diffraction pattern cannot be used for an analysis unless additional information is available.

Observability of Very Thick Specimen by Using Transmission Scanning Electron Microscope

1971 ◽  
Vol 29 ◽  
pp. 26-27
Author(s):  
K. Shibatomi ◽  
T. Yamanoto ◽  
H. Koike
Keyword(s):  
Electron Microscope ◽  
Image Quality ◽  
Scanning Electron Microscope ◽  
Chromatic Aberration ◽  
Image Contrast ◽  
Objective Lens ◽  
Thick Specimen ◽  
Transmission Electron ◽  
Scanning Electron

In the observation of a thick specimen by means of a transmission electron microscope, the intensity of electrons passing through the objective lens aperture is greatly reduced. So that the image is almost invisible. In addition to this fact, it have been reported that a chromatic aberration causes the deterioration of the image contrast rather than that of the resolution. The scanning electron microscope is, however, capable of electrically amplifying the signal of the decreasing intensity, and also free from a chromatic aberration so that the deterioration of the image contrast due to the aberration can be prevented. The electrical improvement of the image quality can be carried out by using the fascionating features of the SEM, that is, the amplification of a weak in-put signal forming the image and the descriminating action of the heigh level signal of the background. This paper reports some of the experimental results about the thickness dependence of the observability and quality of the image in the case of the transmission SEM.

The Current Situation in Chemical Stabilization of Biological Materials

1972 ◽  
Vol 30 ◽  
pp. 132-133
Author(s):  
John H. Luft
Keyword(s):  
Electron Microscopy ◽  
Electron Microscope ◽  
Osmium Tetroxide ◽  
Molecular Level ◽  
Cross Linking ◽  
Chemical Stabilization ◽  
Specimen Preparation ◽  
Sufficient Condition ◽  
Radio Telescopes

With information processing devices such as radio telescopes, microscopes or hi-fi systems, the quality of the output often is limited by distortion or noise introduced at the input stage of the device. This analogy can be extended usefully to specimen preparation for the electron microscope; fixation, which initiates the processing sequence, is the single most important step and, unfortunately, is the least well understood. Although there is an abundance of fixation mixtures recommended in the light microscopy literature, osmium tetroxide and glutaraldehyde are favored for electron microscopy. These fixatives react vigorously with proteins at the molecular level. There is clear evidence for the cross-linking of proteins both by osmium tetroxide and glutaraldehyde and cross-linking may be a necessary if not sufficient condition to define fixatives as a class.

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