• Refine Query
  • Source
  • Publication year
  • to
  • Language
  • 28
  • 20
  • 6
  • 3
  • 2
  • 2
  • 2
  • 2
  • 2
  • 2
  • 2
  • 2
  • 1
  • 1
  • 1
  • Tagged with
  • 72
  • 27
  • 24
  • 23
  • 8
  • 7
  • 7
  • 6
  • 6
  • 6
  • 6
  • 6
  • 5
  • 5
  • 5
  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Morphology and ecology of the velvet-mite, Allothrombium Lerouxi Moss.

Mathur, Sachchida Nand. January 1964 (has links)
There are very few morphological and ecological studies On Acari. This neglect is partly due to the small aize and little known economic importance of the mites. Allothtrombium lerouxi Moss is a comparatively big red velvet mite, approximately 3mm. long, belonging to the family Trombidiidae of the order Acari. It is predatory in nature and feeds On all stages of a number of insects injurious to the apple crop as well as on dying or dead arthropods. In Quebec, the species is found in the orchard undercover throughout the growing season but is mainly seen in early spring and late fall when adults are present. [...]
2

Morphology and ecology of the velvet-mite, Allothrombium Lerouxi Moss.

Mathur, Sachchida Nand. January 1964 (has links)
No description available.
3

EFFECTS OF NITROGEN SOURCE AND NITROGEN METABOLISM ON CHLOROSIS IN LEAVES OF ‘SR 7200’ VELVET BENTGRASS (AGROSTIS CANINA L.)

Xu, Huasong 16 January 2012 (has links)
Field observations show that velvet bentgrass (Agrostis canina L.) (VB) an alternative species to creeping bentgrass (Agrostis stoloniera L.) (CB) exhibits chlorosis in the leaves at high nitrogen rates. Growth chamber experiments were conducted that compared VB and CB using a hydroponic system. The experiments tested 5%NH4+-N, 45%NH4+-N, 95%NH4+-N and urea N-sources. Chlorosis only occurred in VB at the 95% NH4+-N and 100% urea-N source. Nitrate, nitrite, and ammonium levels in leaves showed ammonium accumulation was positively correlated to chlorosis in VB. Enzyme analysis showed initial glutamine synthetase (GS) activity in roots compared to leaves is higher in CB than in VB, explaining low ammonium levels in leaves of CB. The GS activity in the roots of VB increased after 24 hours of treatment. The results showed that the chlorosis in the leaves of VB is the correlated to ammonium accumulation associated with nitrogen form supplied and GS activity.
4

Czechoslovakia: A State of Perceived Bias

Seiler, Danielle M.S. 21 May 1998 (has links)
This thesis explores the circumstances behind the dissolution of the state of Czechoslovakia. Unlike previous works, this paper contends that the Velvet Divorce was not simply a result of the expulsion of Communism, but rather the end product of a multitude of forces, both interior and exterior to the state's boundaries. The transition from Communism was merely the catalyst. In examining the attitudinal and eventual physical division between the majority of Czechs and Slovaks, this paper extends the criteria for consensus articulated by George Schöpflin (1993) into the context of Czechoslovakia. Schöpflin contends that support for the state in the post-Communist period is based on three characteristics: faith in the nation, belief in economic reform, and hatred for all things Communist. This thesis contends that most Czechs and Slovaks in Czechoslovakia were divided on the basis of whether they believed that their nation's right to self-determination had been fulfilled, whether they advocated more socialist or capitalist policies, and whether they benefitted from the experience of Communism. These fundamental differences contributed to the failure to reach agreement in 1992 concerning the shape of the "new" or "revived" Czechoslovakia. Furthermore, this paper will show that the Velvet Divorce was not merely a product of internal disagreements. The creation, existence, and even dissolution of the state were influenced by global forces. Events such as the French Revolution, World War II, and even the Independence of Croatia had an impact in Czechoslovakia. The state was not born into a bubble; its borders were chronically permeable. / Master of Arts
5

Selected topics in peanut production Economic feasibility of an energy crop on a South Alabama cotton-peanut farm, and, Do economies of scale exist on peanut farms in the Southeast? /

Frank, Edward Todd, Duffy, Patricia Ann, January 2005 (has links) (PDF)
Thesis(M.S.)--Auburn University, 2005. / Abstract. Vita. Includes bibliographic references.
6

Digital Infrared Thermal Imaging and its use in Domestic and Non-Domestic Species

Bowers, Susan Denise 15 December 2012 (has links)
Digital infrared thermal imaging (DITI) is a non-invasive diagnostic technique that is used to detect symmetry and asymmetry of surface temperature gradients. DITI can examine many different aspects of thermal physiology and diagnose injury and disease. The objectives of this study were (1) to investigate the use of DITI to determine whether differences in temperature gradients exist between late gestation and non-pregnant mares, (2) to evaluate whether velvet antler (VA) temperature gradients, as measured by DITI would pattern VA growth, and (3) to determine if “normal” temperature gradients of the foot exist among elephants as detected using DITI. To investigate these objectives, three experiments were conducted to determine the value of DITI for research on mammals. Results obtained from the first study indicate DITI was able to detect pregnancy in the horse during late gestation. In the second study DITI successfully patterned the growth and hardening of VA. While in the third study DITI demonstrated its value as a tool to increase overall welfare for captive elephants. In summary these studies suggests that DITI may have value in conducting research with domestic and non-domestic species that are not able to be restrained.
7

The competitive advantage of velvet beans as an economic agricultural commodity / Edward James Daniel de Villiers

De Villiers, Edward James Daniel January 2015 (has links)
The competitive advantage of velvet beans as an economic agricultural commodity. In the past 40 years, although food insecurity, poverty and environmental degradation persist, worldwide farmers have made considerable progress in increasing per capita food production whilst better understanding natural-resource management. Literature indicates that — in the decades to come — food demand will both grow and change for three reasons, namely increased numbers of people, increased income (people will have more purchasing power), and increased urbanisation (people will be more likely to adopt new diets containing animal protein and cereal). The world population is expected to increase to 8,9 billion by 2050, with 84% in the developing countries. Food insecurity and malnutrition are expected to persist despite progress on average per capita consumption of food. As a complex system, and despite challenges, agriculture must produce simultaneously unprecedented abundance of food and unparalleled social concerns. As a business, agriculture requires high capital investments in land, facilities and production inputs; most often producing commodities of generally low unit value with thin profit margins, thereby forcing producers to strive for efficiency in all aspects of production. Therefore, it is of utmost importance that farmers should understand sustainable agriculture; where a more sustainable food-production system seeks to make the best use of nature’s goods and services whilst not being harmful to the environment. Sustainable agriculture should maximise the productivity of the land; should focus on locally adapted resource-conserving technologies which assist whole system redesign and large-scale adoption; and should aim to minimise the use of harmful non-renewable and fossil-fuel derived inputs. Fertilisers have not replaced the function of organic matter and other management practices; but soil erosion and toxic waste rather did increase disproportionately along with increased agricultural production. This has led to a progressive decline in crop and land productivity as a result of soil degradation, water contamination, increasing problems of weed infestation, pests and diseases. Often the apparent absence of sustainable productive agricultural systems within the scope of commercial farmers is not because of the lack in technology or low yield potential of traditional varieties, but rather on account of the limited knowledge or lack of awareness on the part of farmers about sustainable production practices which function in harmony with their farming environment. As one of the keys to success the velvet bean — which can grow almost everywhere — is an example of the introduction of a simple regenerative component into a farming system, as well as boosting the capacity of a farmer for local adaptation of the technology. Integrating the natural processes of nutrient cycling, nitrogen fixation and introducing natural enemies of pests into food production processes can contribute to minimising environmental damage and/or health of the farmer and the consumer. Using the knowledge and skills of farmers helps to improve their self-reliance and to solve a common management problem, such as social- and human-capital management. The velvet bean is seen as an answer to the agricultural problem of low nutrient supply to the staple crop of maize. The bean creates ground cover, regenerates, fertilises the soil, controls weeds and adds organic matter and nutrients. In arid South Africa the crop is one of the strongest defences of the farmer against the harmful effects of El Niño — with the bean protecting the soil, holding water and fertilising the land with its leaves. With the velvet bean farmers can grow their own organic and inexpensive fertilisers. Commercial fertilisers are becoming more and more expensive and their benefit is decreasing because of a degrading soil resource base. Furthermore, the rise in production costs makes total reliance on inorganic fertilisers more uneconomical for most growers in the agricultural sector; making it imperative for researchers to come up with options which increase the efficient use of fertiliser, and also to identify other nutrient sources — such as legumes — that are not capital intensive. The velvet-bean technique is known to researchers and farmers worldwide for a considerable amount of time, but not in our country. As the technique becomes better known to South African farmers, it can be considered in a broader sense as a modern way to add nitrogen to the soil; benefitting, amongst others, the subsequent crop. The velvet-bean approach has a window of opportunity which can lead to higher yields in crop production, decline in labour costs, crop diversification, as well as agro-processing — all resulting in improved food security for South Africa. Adopting the velvet bean into a production system can benefit a farmer, by achieving maize yields of 3 t/ha–4 t/ha (similar to yields normally obtained with recommended levels of fertilisation at 130 kg N/ha) without applied nitrogen fertiliser or input for weeding. Velvet beans, as an intercrop, can provide more than 100 kg N/ha to the following crop. However, literature shows a declining trend over time for all systems, which suggests that additional external inputs (probably P and K fertiliser) are required to achieve full sustainability. The adoption of the velvet bean in the South African maize industry would result in import savings of about 158 million tons of urea or about R591 billion/year. Information presented in this mini-dissertation is considered to be the current state of knowledge on establishing, managing, and utilising the velvet bean as a legume in South Africa’s commodity market; with the belief that it will expand the use of the bean, and will enhance the benefits from its use. / MBA, North-West University, Potchefstroom Campus, 2015
8

The competitive advantage of velvet beans as an economic agricultural commodity / Edward James Daniel de Villiers

De Villiers, Edward James Daniel January 2015 (has links)
The competitive advantage of velvet beans as an economic agricultural commodity. In the past 40 years, although food insecurity, poverty and environmental degradation persist, worldwide farmers have made considerable progress in increasing per capita food production whilst better understanding natural-resource management. Literature indicates that — in the decades to come — food demand will both grow and change for three reasons, namely increased numbers of people, increased income (people will have more purchasing power), and increased urbanisation (people will be more likely to adopt new diets containing animal protein and cereal). The world population is expected to increase to 8,9 billion by 2050, with 84% in the developing countries. Food insecurity and malnutrition are expected to persist despite progress on average per capita consumption of food. As a complex system, and despite challenges, agriculture must produce simultaneously unprecedented abundance of food and unparalleled social concerns. As a business, agriculture requires high capital investments in land, facilities and production inputs; most often producing commodities of generally low unit value with thin profit margins, thereby forcing producers to strive for efficiency in all aspects of production. Therefore, it is of utmost importance that farmers should understand sustainable agriculture; where a more sustainable food-production system seeks to make the best use of nature’s goods and services whilst not being harmful to the environment. Sustainable agriculture should maximise the productivity of the land; should focus on locally adapted resource-conserving technologies which assist whole system redesign and large-scale adoption; and should aim to minimise the use of harmful non-renewable and fossil-fuel derived inputs. Fertilisers have not replaced the function of organic matter and other management practices; but soil erosion and toxic waste rather did increase disproportionately along with increased agricultural production. This has led to a progressive decline in crop and land productivity as a result of soil degradation, water contamination, increasing problems of weed infestation, pests and diseases. Often the apparent absence of sustainable productive agricultural systems within the scope of commercial farmers is not because of the lack in technology or low yield potential of traditional varieties, but rather on account of the limited knowledge or lack of awareness on the part of farmers about sustainable production practices which function in harmony with their farming environment. As one of the keys to success the velvet bean — which can grow almost everywhere — is an example of the introduction of a simple regenerative component into a farming system, as well as boosting the capacity of a farmer for local adaptation of the technology. Integrating the natural processes of nutrient cycling, nitrogen fixation and introducing natural enemies of pests into food production processes can contribute to minimising environmental damage and/or health of the farmer and the consumer. Using the knowledge and skills of farmers helps to improve their self-reliance and to solve a common management problem, such as social- and human-capital management. The velvet bean is seen as an answer to the agricultural problem of low nutrient supply to the staple crop of maize. The bean creates ground cover, regenerates, fertilises the soil, controls weeds and adds organic matter and nutrients. In arid South Africa the crop is one of the strongest defences of the farmer against the harmful effects of El Niño — with the bean protecting the soil, holding water and fertilising the land with its leaves. With the velvet bean farmers can grow their own organic and inexpensive fertilisers. Commercial fertilisers are becoming more and more expensive and their benefit is decreasing because of a degrading soil resource base. Furthermore, the rise in production costs makes total reliance on inorganic fertilisers more uneconomical for most growers in the agricultural sector; making it imperative for researchers to come up with options which increase the efficient use of fertiliser, and also to identify other nutrient sources — such as legumes — that are not capital intensive. The velvet-bean technique is known to researchers and farmers worldwide for a considerable amount of time, but not in our country. As the technique becomes better known to South African farmers, it can be considered in a broader sense as a modern way to add nitrogen to the soil; benefitting, amongst others, the subsequent crop. The velvet-bean approach has a window of opportunity which can lead to higher yields in crop production, decline in labour costs, crop diversification, as well as agro-processing — all resulting in improved food security for South Africa. Adopting the velvet bean into a production system can benefit a farmer, by achieving maize yields of 3 t/ha–4 t/ha (similar to yields normally obtained with recommended levels of fertilisation at 130 kg N/ha) without applied nitrogen fertiliser or input for weeding. Velvet beans, as an intercrop, can provide more than 100 kg N/ha to the following crop. However, literature shows a declining trend over time for all systems, which suggests that additional external inputs (probably P and K fertiliser) are required to achieve full sustainability. The adoption of the velvet bean in the South African maize industry would result in import savings of about 158 million tons of urea or about R591 billion/year. Information presented in this mini-dissertation is considered to be the current state of knowledge on establishing, managing, and utilising the velvet bean as a legume in South Africa’s commodity market; with the belief that it will expand the use of the bean, and will enhance the benefits from its use. / MBA, North-West University, Potchefstroom Campus, 2015
9

Examining the Effects of Deer Antler Velvet Supplementation on Muscular Strength, Performance, and Markers of Delayed Onset Muscle Soreness.

Percival, Robyn Suzanne 01 December 2001 (has links)
Purpose: To examine the effects of deer antler velvet on muscular strength, performance, and markers of delayed onset muscle soreness following a 10-week resistance training period. Participants: 16 resistance-trained males (18-35) volunteered. Measures: DEXA, 1-RM, a power test, and a 70% performance trial were measured. Creatine kinase and self-reported soreness levels were measured following an eccentric trial. Results: No pre-experimental significant differences existed between the groups for any of the variables measured. There were no significant differences between the groups regarding body composition, strength, muscular performance, or improvements in creatine kinase and soreness levels from pre to post-intervention. Both groups demonstrated significant (p<0.05) increases in creatine kinase and soreness levels immediately post-exercise and 48 hours following the eccentric trial at the 0 and 10-week measurement periods. Conclusions: Deer antler velvet does not improve muscle size, strength, or performance. Nor does it reduce markers of DOMS following a 10-week supplementation period.
10

In vitro and in vivo host range of the velvetbean caterpillar Anticarsia gemmatalis (Hübner) multiple nuclear polyhedrosis virus (AgMNPV) /

Grasela, James J. January 1997 (has links)
Thesis (Ph. D.)--University of Missouri-Columbia, 1997. / Typescript. Vita. Includes bibliographical references (leaves 156-174). Also available on the Internet.

Page generated in 0.2494 seconds