Letteratura scientifica selezionata sul tema "Wool Growth"
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Articoli di riviste sul tema "Wool Growth"
1
Lee, GJ, e AJ Williams. "Nutritional responses in wool growth by four Merino genotypes of differing wool growth performance". Australian Journal of Agricultural Research 45, n. 6 (1994): 1171. http://dx.doi.org/10.1071/ar9941171.
Testo completoAbstract (sommario):
Sheep from four Merino flocks, different in annual clean fleece production when grazed together, were offered a range of nutritional treatments to compare their ability to digest dietary organic matter (experiment 1) and to compare the relationships of wool growth and fibre diameter with nutrient intake (experiment 2). The sheep were selected from a finewool (Fl), a strong wool (S), and two medium-Peppin (MP6 and MP10) flocks. The nutritional treatments varied intakes of two pelleted diets-B and F. Diet B consisted of oat grain, lucerne chaff, and oaten straw, while diet F was as for B but fortified with fishmeal. The digestibility of both diets was negatively related to the level of intake, and there were some differences between the flocks in their ability to digest organic matter. Clean wool growth per unit area of skin was curvilinearly related (P < 0.001) to N intake, but was not influenced by diet per se. The regression coefficient for the relationship of clean wool growth with N intake and the estimated maximum wool growth rate of flock F1 were less than the other flocks. However, flock MP10 grew less wool than flocks S and MP6 at any given intake. Variation in (fibre diameter)2 accounted for 0.6 of the variation in wool growth, with responses in fibre diameter to intake being similar to those observed in wool growth. The responses in plasma cystine of the flocks to N intake differed, with the relationship for flock F1 being curvilinear and reaching a maximum at an intake of 27 g N day-1, while the responses of the other flocks were essentially linear. The relationships between plasma cystine level and wool growth differed between the flocks such that wool growth of sheep from flocks S and MP6 was more responsive to increased plasma concentration of cystine.
2
Oddy, V. H. "Wool growth of pregnant and lactating Merino ewes". Journal of Agricultural Science 105, n. 3 (dicembre 1985): 613–22. http://dx.doi.org/10.1017/s0021859600059529.
Testo completoAbstract (sommario):
SUMMARYThe wool production of pregnant, lactating and non-pregnant, non-lactating (dry) Merino ewes eating one of three diets: chaffed oaten hay (OH), chaffed lucerne hay (LH), and a 50/50 (w/w) mixture of OH and LH, was determined. Measurements were made for 2 months prior to mating, during pregnancy and for 3 months after lambing, and for the dry ewes over the same period.Production of clean wool (Y, g/day) by dry ewes was linearly related to digestible organic matter intake (X, g/day):Y = 0·0301 X - 3·34, r = 0·97.Clean wool growth was significantly less (P < 0·01) than dry ewes in the 4th and 5th month of pregnancy and throughout lactation. During pregnancy the total deficit in clean wool growth (calculated as the difference between observed wool growth and that expected on the basis of the relationship between feed intake and clean wool growth of dry ewes) was 456 g for ewes bearing a single lamb and 578 g for those bearing twins, with no difference between diets. In lactation the total clean wool growth deficit increased as milk production increased, and for every litre of milk produced there was a deficit of 12 g clean wool.Wool fibre diameter was reduced during the 1st month of lactation. There was no consistent effect of pregnancy or lactation on the number of wool follicles per mm2, the ratio of primary plus secondary to primary wool follicles, or on the thickness of skin on the midside.Digestibility of dietary organic matter (DOM) was reduced during the last 3 months of pregnancy, and the first 2 months of lactation. However, this was insufficient to account for the magnitude of the decrease in wool growth seen during pregnancy and lactation.Wool sulphur content increased during pregnancy (P < 0·001), but not during lactation. The relationship between total plasma cyst(e)ine concentration and DOM intake during pregnancy was similar to that in dry ewes, but during lactation total plasma cyst(e)ine concentration was less than expected. It was calculated that during pregnancy the amount of sulphur saved through reduced wool growth was greater than that deposited in the conceptus, and during lactation the amount of sulphur saved in reduced wool growth matched that excreted as milk.These results are discussed in relation to control of wool growth during pregnancy and lactation.
3
Maddocks, S., Y. Chandrasekhar e BP Setchell. "Effect on Wool Growth of Thyroxine Replacement in Thyroidectomized Merino Rams". Australian Journal of Biological Sciences 38, n. 4 (1985): 405. http://dx.doi.org/10.1071/bi9850405.
Testo completoAbstract (sommario):
The effect on wool growth of thyroidectomy with subsequent thyroxine replacement at subnormal and supranormallevels has been investigated in Merino rams fed a restricted basal diet. Thyroidectomy without thyroxine replacement caused a greater than 60% reduction in wool growth. Provision of 30% of normal plasma thyroxine concentrations was sufficient to return wool growth to normal. Similarly, complete replacement of plasma thyroxine levels gave normal wool growth while increasing thyroxine concentrations to three times normal increased wool growth to levels slightly above normal. These results provide a possible explanation for the inability of other workers to correlate seasonal thyroxine patterns and annual wool growth variations.
4
Haque, Abu Naser Md Ahsanul, e Maryam Naebe. "Waste Wool Powder for Promoting Plant Growth by Moisture Retention". Sustainability 14, n. 19 (27 settembre 2022): 12267. http://dx.doi.org/10.3390/su141912267.
Testo completoAbstract (sommario):
Natural wastes are widely used as composts for plant growth. However, wool waste has received little attention in this regard, despite its nitrogen-rich chemical structure owing to amide groups. A few studies have been conducted for soil amendment using wool, mostly in raw or pellet form. However, despite the possible consistent mixing and more uniform effect of powders inside soil, wool has never been implemented in powder form in soil for improving moisture. This study demonstrates the effectiveness of using wool as a powder, facilitating better mixing and spreading in soil. Results show that wool powders are more effective in retaining soil moisture compared to wool pellets and are comparable to commercial fertiliser. The findings further indicate that a balanced amount of wool is required to maintain a proper moisture level (not too wet or dry) to promote actual plant growth.
5
Sun, Y. X., A. Michel, G. A. Wickham e S. N. McCutcheon. "Wool follicle development, wool growth and body growth in lambs treated from birth with recombinantly derived bovine somatotropin". Animal Science 55, n. 1 (agosto 1992): 73–78. http://dx.doi.org/10.1017/s0003356100037296.
Testo completoAbstract (sommario):
AbstractThe effect of recombinantly derived bovine somatotropin (bST) administration on wool follicle populations, wool growth and body growth was examined in young lambs. Romney × (Border Leicester × Romney) lambs were treated with bST at doses of 0·1 or 0·3 mg/kg live weight per day, or with excipient, commencing on the day of birth and continuing at weekly intervals until the last injection was given at 11 weeks of age. Concentrations of immunoreactive somatotropin in plasma were 19·2 (s.e. 2·1), 65·2 (s.e. 2·8) and 74·7 (s.e. 4·8) μgll in the control, low dose bST and high dose bST groups, respectively. Somatotropin treatment did not alter the density of primary (P) or secondary (S) follicles in the skin, or the S/P ratio, as measured by histological examination of mid-side skin biopsy samples at 14 weeks of age. Mid-side greasy and clean wool growth during weeks 2 to 14 of the study were increased (P < 0·05) in bST-treated lambs but treatment had no effect on wool growth during the immediate post-treatment period (weeks 14 to 22), or on yearling fleece weight or wool quality characteristics. Body growth was not altered by bST administration. It is concluded that bST treatment stimulates wool growth even in very young lambs but, contrary to the results of a previous study, does not alter the development of wool follicle populations.
6
Bond, J. J., P. C. Wynn, G. N. Brown e G. P. M. Moore. "Growth of wool follicles in culture". In Vitro Cellular & Developmental Biology - Animal 30, n. 2 (febbraio 1994): 90–98. http://dx.doi.org/10.1007/bf02631399.
Testo completo
7
Wuliji, T., IL Weatherall, RN Andrews, KG Dodds, PR Turner e R. Wheeler. "Effect of selection for wool growth on seasonal patterns of yield, fibre diameter, and colour in Romney lines". Australian Journal of Experimental Agriculture 35, n. 1 (1995): 27. http://dx.doi.org/10.1071/ea9950027.
Testo completoAbstract (sommario):
Seasonal wool growth and associated wool characteristics were measured in a Romney line selected for high fleece weight and an unselected control line in 1990 and 1991. Both had a significant (P<0.01) decline in wool growth rate in winter compared with summer. The wool growth rate advantage (P<0.001) of the selected line over the control averaged 19 and 33% for ewes, and 24 and 36% for hoggets, in summer and winter, respectively. Staple strength, yield, and fibre diameter differences were closely associated with wool growth. Colour analysis showed no difference between lines in either brightness (Y) or yellowness (Y - Z). However, both the Y and Z values were lower in spring and summer, while Y - Z was highest in summer. The results suggest that selection for high fleece weight also improves major wool characteristics and reduces the relative winter wool growth decline in Romneys.
8
Radcliffe, BC, PI Hynd, NJ Benevenga e AR Egan. "Effect of cysteine ethyl ester supplements on wool growth rate". Australian Journal of Agricultural Research 36, n. 5 (1985): 709. http://dx.doi.org/10.1071/ar9850709.
Testo completoAbstract (sommario):
L-Cysteine ethyl ester hydrochloride (CEE) was evaluated as a dietary sulfur amino acid supplement for increasing wool growth rate. In Experiment 1, eight sheep were offered 800 g chopped lucerne hay daily and wool growth was measured over a three-week control period. These sheep were then given a continuous infusion of either CEE per rumen, CEE per abomasum, cysteine per abomasum or continued on the basal diet alone, for three weeks, and wool growth was measured again. All supplements were equivalent to 25 mmol/day. Wool growth rate on tattooed patches in sheep given CEE per rumen or abomasum increased 67% and 75% respectively above the rates prior to infusion, while that of animals given cysteine increased 45%. Wool growth rate in the control sheep increased by only 15% in the same period. In Experiment 2, wool growth was measured in 24 sheep offered 800 g/day lucerne chaff, and again when CEE, cystine, or Na2SO4, each providing 21 mmol S/day, were combined with mineral mix and offered with the feed. CEE and cystine increased wool production by 1.9 g/sheep/day (P < 0.01) and 1.0 g/day (P < 0.05), respectively, above that measured in the control groups (nil- or Na2SO4- supplemented) which did not differ.
9
Contrisciano, Thomas M., e E. Jay Holcomb. "GROWTH OF BEDDING PLANTS IN MINERAL WOOL AND MINERAL WOOL/PEAT MIXES". HortScience 27, n. 6 (giugno 1992): 686b—686. http://dx.doi.org/10.21273/hortsci.27.6.686b.
Testo completoAbstract (sommario):
The objective of this research was to develop a mineral wool based growing medium for the horticultural industry. Two types of hydrophilic mineral wool, clean wool (CW) and unclean wool (UC) were used unamended, as well as both types in combinations with 25, 50, and 75 percent peat moss (PM). A control of 100 percent (PM) was also used. Unamended CW had a low bulk density, excellent water holding capacity, good aeration, but high pH. Once PM was added to CW, bulk density still remained low, water holding capacity and aeration remained good, and the pH dropped to a more suitable level. Unamended UW had a high bulk density, good water holding capacity, poor aeration, and high pH. Once PM was added to UW, bulk density decreased, water holding capacity remained good, aeration increased, and pH decreased to a more optimal level. Impatiens `Violet' and Begonia `Whiskey' were grown in the nine treatments for six and nine weeks respectively. At harvest, plant growth was evaluated by height, diameter, fresh weight, dry weight, and tissue analysis. Plant growth response showed plants grown in unamended CW, UW, and PM were smaller in size and lighter in fresh and dry weights than those in 50 percent wool/50 percent PM. The plants grown in 25 and 75 percent PM were similar to the 50 percent wool/50 percent PM in size and weight.
10
Davies, S. C., I. H. Williams, C. L. White e J. E. Hocking Edwards. "Tunicamycin reduces wool growth by slowing the mitotic activity of wool follicles". Australian Journal of Agricultural Research 48, n. 3 (1997): 331. http://dx.doi.org/10.1071/a96055.
Testo completoAbstract (sommario):
Reductions in wool growth have previously been observed in ewes exposed to low levels of corynetoxins, the causal agents of annual ryegrass toxicity. In this experiment, tunicamycin, a commercially available and closely related toxin, was infused into an isolated area of skin on the abdominal flank. Eleven sheep were continuously infused for 5 days with saline on one side and a total dose of either 35 or 350 µg tunicamycin/kg affected skin on the other side. Both fibre length (P < 0·05) and fibre diameter (P < 0·01) were reduced by tunicamycin treatment. Cell division in the wool follicle bulb was also reduced by tunicamycin (P < 0·005), indicating that the toxin is able to have a direct effect on the follicles and their ability to produce wool. The permeability of the vascular system increased in the skin tissue treated with tunicamycin, but only at the highest toxin dose (P < 0·05); therefore, poor nutrient supply to the follicle may be a minor contributor to reduced wool growth. The direct effect of tunicamycin on the wool follicle explains why wool growth is reduced by low levels of corynetoxins independently of, and prior to, effects on the whole animal.
Tesi sul tema "Wool Growth"
1
Ansari-Renani, Hamid Reza. "Follicle shutdown and wool staple strength : a thesis submitted in fulfilment of the requirements for the degree of Doctor of Philosophy". Title page, contents and abstract only, 1996. http://web4.library.adelaide.edu.au/theses/09ANP/09anpa617.pdf.
Testo completo
2
Bray, Megan. "Regulation of wool and body growth : nutritional and molecular approaches". Title page, contents and abstract only, 2002. http://web4.library.adelaide.edu.au/theses/09PH/09phb8267.pdf.
Testo completoAbstract (sommario):
"May 2002" Includes bibliographical references (leaves 148-164) Describes a series of novel experiments designed to enhance our understanding of nutrient utilisation for growth of wool and the whole body.
3
Nancarrow, Michelle Jane. "The role of polyamines in cellular and molecular events in the wool follicle". Title page, contents and abstract only, 1995. http://web4.library.adelaide.edu.au/theses/09PH/09phn1756.pdf.
Testo completoAbstract (sommario):
Bibliography: leaves 255-280. In vivo and in vitro investigations of the hypothesis that polyamines and their synthetic enzymes have a role in regulation of cellular and molecular processes in the follicle. The activity of ornithine decarboxylase (ODC), the rate limiting polyamine biosynthetic enzyme, is demonstrated in wool follicle homogenates.
4
Moore, Anthony G., University of Western Sydney e School of Science. "The role of the extracellular matrix in wool follicle development". THESIS_XXXX_SS_Moore_A.xml, 1999. http://handle.uws.edu.au:8081/1959.7/389.
Testo completoAbstract (sommario):
Molecular and behavioural characterisation of ovine dermal papilla cells performed in this study indicate they synthesise a highly specialised extracellular matrix (ECM). This is conserved between different species and distinguishes papilla cells from dermal fibroblasts with which they have a common origin. The composition of the dermal papilla ECM is temporally and spatially regulated during wool follicle development. It was shown that the ECM associated with dermal papilla cells in foetal sheep skin becomes specialised in regard to chondroitin sulphate synthesis prior to the appearance of follicle primordia. Chrondroitin sulphate and fibronectin were present in the ECM of dermal papilla cells throughout follicle development and during fibre production. Cellular differentiation antigen 44 was present in the ECM od papilla cells exclusively during the formation of dermal papilla, while laminin was present in the dermal papilla ECM of fibre producing follicles only. Co-operation between chondroitin sulphate, fibronectin, and CD44 in regulating the agrregative and proliferative behaviour of papilla cells was demonstrated in culture. Finally, the inhibition of proteoglycan synthesis in newborn mouse skin was found to disrupt the growth of existing follicles and the generation of new ones. Together these findings demonstrate that chondroitin sulphate is intimately associated with the earliest interactions between epithelial and mesenchymal cells during the formation of follicle primordia. It is likely that the interactions specifically involve fibronectin and CD44, and possibly other ECM molecules which have he effect of regulating the behaviour of papilla cellsDoctor of Philosophy (PhD)
5
Barnes, Anne Louise. "The effect of lupinosis on reproduction and wool growth of the merino ewe". Thesis, Barnes, Anne Louise ORCID: 0000-0002-7227-230X (1993) The effect of lupinosis on reproduction and wool growth of the merino ewe. PhD thesis, Murdoch University, 1993. https://researchrepository.murdoch.edu.au/id/eprint/41883/.
Testo completoAbstract (sommario):
Lupinosis, a mycotoxicosis caused by phomopsins produced on lupin plants (Lupinus spp.) by Phomopsis leptostromiformis, is a disease of economic importance in W estem Australia. Preliminary studies and anecdotal reports indicated detrimental effects of lupinosis on reproduction and wool growth of ewes. The research described in this thesis was conducted to confirm experimentally the existence and magnitude of these effects on production, and to determine the stages of the reproductive cycle sensitive to phomopsin intoxication.
Mice were used to assess the effects of phomopsins on ovulation rate and on the early preimplantation embryo. Administration of phomopsins to female mice before ovulation reduced the number of mice mating and the number of embryos recovered. Culture of two-cell mouse embryos in medium containing phomopsins reduced the number developing to the blastocyst stage, with the embryos most sensitive to the effects of phomopsins before compaction and formation of the blastocoele.
Ovulation rate was depressed and wastage of ova was increased by the administration of phomopsins to ewes for 14 days before and 14 days after oestrus, resulting in 39 less lambs produced per 100 ewes than in the control groups.
The survival and growth of embryos/foetuses was reduced in ewes injected with phomopsins from approximately day 8 to 58 of pregnancy. Lamb marking rates were 10-20% less from phomopsin-treated ewes than from control ewes.
The wool production of ewes was significantly depressed by lupinosis. Length growth rate and mean fibre diameter were reduced after administration of phomopsins, and took up to 69 days to recover. The annual wool growth of the ewes was variable, and pregnancy and lactation reduced the quality and quantity of wool grown. There were reductions in clean fleece weight, yield, mean fibre diameter and staple strength, and changes in position of break attributable to administration of phomopsins.
Phomopsin intoxication significantly depressed the reproductive performances of ewes at all stages of the reproductive cycle examined, and reduced the quantity and quality of wool grown by the ewes.
6
Relf, Bronwyn Lee, University of Western Sydney e School of Science. "Isolation and characterisation of genes expressed in the wool follicle". THESIS_XXX_SS_Relf_B.xml, 1999. http://handle.uws.edu.au:8081/1959.7/529.
Testo completoAbstract (sommario):
Wool from Merino sheep is an important component of the Australian economy. However, little is known of the mechanisms within the wool follicle that regulate fibre production. The aim of the research described here was to identify and characterise some of the genes expressed in the follicle.A highly expressed gene has been identified from skin and sequenced. The information obtained on this gene suggests that it might be of use in future transgenic studies. Two cDNA libraries were constructed. The first was constructed using small amounts of total RNA from skin and PCR methodology, following a published method. A second cDNA library was then produced from adult mid-flank skin using a commercially available kit. A pool of 420 potential wool follicle specific transcripts were identified from this adult mid-flank skin cDNA library using a combination of differential and subtractive screening. Clone 1-25 was chosen as the focus for the remaining work described in this thesis. Expression of clone 1-25 was detected at all stages of wool follicle development and was localised to the wool follicle bulb, inner root sheath, outer root sheath, epidermis, but not the dermis or dermal papilla. The function of clone 1-25 is as yet unknown. However, from its expression in the wool follicle, and studies by other groups, it appears that it may play a role in inducing differentiationDoctor of Philosophy (PhD) (Biological Sciences)
7
Lee, William (Chun-To). "Harvesting Philosopher's Wool: A Study in the Growth, Structure and Optoelectrical Behaviour of Epitaxial ZnO". Thesis, University of Canterbury. Electrical and Computer Engineering, 2008. http://hdl.handle.net/10092/2507.
Testo completoAbstract (sommario):
This thesis is about the growth of ZnO thin films for optoelectronic applications. ZnO thin films were grown using plasma assisted molecular beam epitaxy and were studied using various conventional and novel characterisation techniques. The significance of different growth variables on growth efficiency was investigated. The growth rate of ZnO films was found to be linearly dependent on the Zn flux under O-rich growth conditions. Under Zn-rich conditions, the growth rate was dependent on both atomic and molecular oxygen flux. By characterising the oxygen plasma generated using different RF power and aperture plate designs and correlating the results with the growth rates observed, it was found that atomic oxygen was the dominant growth species under all conditions. Molecular oxygen also participated in the growth process, with its importance dependent on the aperture plate design. In addition, an increase in growth temperature was found to monotonically decrease the growth rate. A growth rate of 1.4 Å/s was achieved at a growth temperature of 650 ℃ by using an oxygen flow rate of 1.6 standard cubic centimetres utilising a plasma source with a 276 hole plate operating at 400 W, and a Zn flux 1.4✕10¹⁵ atoms/cm²⋅s. Characterisation of the MBE grown thin films revealed that the qualities of ZnO thin films were dependent on the growth conditions. Experimental evidence suggested that a maximum adatom diffusion rate can be achieved under Zn-rich conditions, giving samples with the best structural quality. O-rich conditions in general led to statistical roughening which resulted in rough and irregular film surfaces. Experimental results also suggested that by increasing the atomic oxygen content and decreasing the ion content of the plasma, the excitonic emission of the ZnO thin films can possibly be improved. It was also found that the conductivity of the films can possibly be reduced by increasing the plasma ion content. By investigating the evolution of the buffer layer surface during the early stages of growth, dislocation nucleation and surface roughening were found to be important strain relief mechanisms in MBE grown ZnO thin films that affected the crystal quality. The usage of LT-buffer layers was found to improve substrate wetting, and was shown to significantly reduce dislocation propagation. Further strain reduction was achieved via the application of a 1 nm MgO buffer layer, and a significant reduction of carrier concentration and improvement in optical quality was subsequently observed. A carrier concentration of <1✕10¹⁶ cm⁻³ and a near band emission full width half maximum of 2 meV was observed for the best sample. The study of electrical characteristics using the variable magnetic field Hall effect confirmed the existence of a degenerate carrier and a bulk carrier in most MBE grown ZnO thin films. The bulk carrier mobility was measured to be ~120 - 150 cm²/Vs for most as-grown samples, comparable to the best reported value. A typical bulk carrier concentration of ~1✕10¹⁶ - 1✕10¹⁸ cm⁻³ was observed for as-grown samples. Annealing was found to increase the mobility of the bulk carrier to ~120 - 225 cm²/Vs and decrease the bulk carrier concentration by two orders of magnitude. Using time resolved photoluminescence, it was found that the radiative recombination in MBE grown ZnO thin films was dominated by excitonic processes, and followed a T³⁄² trend with temperature. A maximum radiative lifetime of 10 ns was observed for as-grown samples. The non-radiative lifetime in ZnO thin films was dominated by the Shockley-Read-Hall recombination processes. The modelling of the temperature dependence of the non-radiative lifetime suggested that an electron trap at ~0.065 eV and a hole trap at ~0.1 eV may be present in these samples. The application of time resolved photoluminescence also allowed the direct observation of carrier freeze-out in these ZnO films at low temperature.
8
Moore, Anthony G. "The role of the extracellular matrix in wool follicle development". Thesis, View thesis, 1999. http://handle.uws.edu.au:8081/1959.7/389.
Testo completoAbstract (sommario):
Molecular and behavioural characterisation of ovine dermal papilla cells performed in this study indicate they synthesise a highly specialised extracellular matrix (ECM). This is conserved between different species and distinguishes papilla cells from dermal fibroblasts with which they have a common origin. The composition of the dermal papilla ECM is temporally and spatially regulated during wool follicle development. It was shown that the ECM associated with dermal papilla cells in foetal sheep skin becomes specialised in regard to chondroitin sulphate synthesis prior to the appearance of follicle primordia. Chrondroitin sulphate and fibronectin were present in the ECM of dermal papilla cells throughout follicle development and during fibre production. Cellular differentiation antigen 44 was present in the ECM od papilla cells exclusively during the formation of dermal papilla, while laminin was present in the dermal papilla ECM of fibre producing follicles only. Co-operation between chondroitin sulphate, fibronectin, and CD44 in regulating the agrregative and proliferative behaviour of papilla cells was demonstrated in culture. Finally, the inhibition of proteoglycan synthesis in newborn mouse skin was found to disrupt the growth of existing follicles and the generation of new ones. Together these findings demonstrate that chondroitin sulphate is intimately associated with the earliest interactions between epithelial and mesenchymal cells during the formation of follicle primordia. It is likely that the interactions specifically involve fibronectin and CD44, and possibly other ECM molecules which have he effect of regulating the behaviour of papilla cells
9
Scobie, David Roger. "Short term effects of stress hormones on cell division rate in wool follicles : a thesis submitted in fulfilment of the requirements for the degree of Doctor of Philosophy". Title page, abstract and contents only, 1992. http://web4.library.adelaide.edu.au/theses/09PH/09phs421.pdf.
Testo completoAbstract (sommario):
Includes bibliographical references (leaves 183-207) A local intradermal technique using colchicine to estimate cell division rate in wool follicles is refined and used throughout the thesis. Statistical methods used to analyse data obtained with this method are described and discussed. The implications of the findings are of great significance to research into the influence of physiological changes on wool production, and suggest experiments should be conducted under controlled environmental conditions, with a minimum of stress imposed on the animals.
10
Vedegytė, Vaida. "Ūkio dydžio įtaka avių produktyvumui". Master's thesis, Lithuanian Academic Libraries Network (LABT), 2014. http://vddb.library.lt/obj/LT-eLABa-0001:E.02~2014~D_20140618_233058-29401.
Testo completoAbstract (sommario):
Temos aktualumas. Avininkystė Lietuvoje yra svarbi žemės ūkio sritis. Šio sektoriaus plėtrai šalyje yra palankios gamtinės sąlygos, susiformavusios gyvulių auginimo tradicijos, sukaupta patirtis. Gyvulininkystės sektorius yra daugiašakė ir įvairiapuse produkcija pasižyminti veikla, reikšminga Lietuvos gyventojams daugeliu ekonominių ir socialinių aspektų. Šis sektorius yra reikšmingas, aprūpinant Lietuvos vartotojus įvairiais maisto produktais bei svarbus Lietuvos eksporto šaltinis. Gyvūninės kilmės produktai yra svarbi subalansuotos mitybos dalis. Juose yra daug žmogaus organizmui reikalingų maisto medžiagų, vitaminų ir mineralų. Lietuvos Respublikos žemės ūkis atlieka svarbią ekonominę, socialinę, gamtosauginę ir etnokultūrinę funkciją, todėl laikomas prioritetine ūkio šaka. Jis pajėgus aprūpinti šalies gyventojus visais kokybiškais maisto produktais ir dalį jų eksportuoti. Nors ir lėtai, avininkystės sektorius plečiasi. Auga mėsos paklausa, atsigauna ir vilnos bei kailių perdirbėjai.
Vidutinis avių ūkis Lietuvoje, palyginti su vakarų šalimis, dar yra labai mažas. Dauguma augintojų laiko nedaug avių. O tų žmonių, kuriems avininkystė yra verslas, tėra vos kelios dešimtys. Tačiau mažieji augintojai pamažu didina savo bandas.
Įdiegus pažangias intensyvaus avių auginimo technologijas, auginant perspektyvias krypties avių veisles, galima tikėtis šio verslo sėkmės.
Darbo objektas: skirtingą skaičių avių turintys ūkiai.
Darbo tikslas: išanalizuoti ūkio dydžio įtaką avių... [toliau žr. visą tekstą]Relevance of the thesis. Shepherding has an important place in Lithuania‘s agriculture. There are suitable enviromental conditions, established cattle herding traditions and accumulated experience needed for this sector‘s further development in the country. The area of animal husbandry is activity known for its multisectoral and multifaceted production, many aspects of which has great economical and social significance for Lithuanians. This area is also very significant when providing Lithuanian consumer with eatables, furthermore it is very important branch of Lithuania‘s export. Products of animal origin takes big part in a balanced diet. They contain many components, vitamins and minerals which human body requires daily. Husbandry has important economical, social, enviromental and ethnocultural function in the Republic of Lithuania, thus it has priority in Lithuania‘s economy. It has capability not only to provide quality eatables for citizens, but also to export some. Sheepherding sector is growing, even though the growth rate is not very pronounced. The demand for meat grows; wool and fur processors are recovering. In Lithuania average sheep farm is very small when comparing with farms in other western countries. Most livestock owners don‘t have a lot of sheep. Furthermore, there are only few who make business out of it. However the small farmers seem to be increasing their flocks. If this business were introduced to advanced sheep herding technologies as well as... [to full text]
Libri sul tema "Wool Growth"
1
1927-, Rogers G. E., e Symposium on the Biology of Wool and Hair (1987 : University of Adelaide), a cura di. The Biology of wool and hair. London: Chapman and Hall, 1989.
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2
Radosevich, Steven R. Good wood: Growth, loss, and renewal. Corvallis: Oregon State University Press, 2005.
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3
Nigro, Giampiero, a cura di. La moda come motore economico: innovazione di processo e prodotto, nuove strategie commerciali, comportamento dei consumatori / Fashion as an economic engine: process and product innovation, commercial strategies, consumer behavior. Florence: Firenze University Press, 2022. http://dx.doi.org/10.36253/978-88-5518-565-3.
Testo completoAbstract (sommario):
The study of the textile sector has always been central to economic history: from reconstructions of the dynamic growth in the medieval wool industry, to the rise of silk and light and mixed fabrics in the modern era, to the driving role of cotton in the industrialisation process. Although the dynamics of textile manufacturing are closely linked to the transformations of fashion, economic history has long neglected its role as a factor in economic change, treating it primarily as a kind of exogenous catalyst. This book makes a decisive contribution to the understanding of a fundamental transformation, the consequences of which are projected into contemporary society, but which matured in pre-industrial times: the advent of fashion.
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R, Barnett John, e Jeronimidis George, a cura di. Wood quality and its biological basis. Oxford: Blackwell, 2003.
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Maeglin, Robert R. Juvenile wood, tension wood, and growth stress effects on processing hardwoods. [Madison, Wis.?: Forest Products Laboratory, 1991.
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Sadler, Robert D. Wool: A glossary of wool terms used from the grower to the spinner. [Newton, Mass.]: R.D. Sadler, 1994.
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Jozsa, L. A. Basic wood properties of second-growth western hemlock. Victoria, B.C: B.C. Ministry of Forests, Forest Practices Branch, 1998.
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Bendtsen, B. A. Mechanical and anatomical properties in individual growth rings of plantation-grown eastern cottonwood and loblolly pine. Madison, WI: Forest Products Laboratory, 1987.
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Archer, Robert R. Growth stresses and strains in trees. Berlin: Springer-Verlag, 1987.
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Zheng, Jinghai. Productivity growth and capacity utilization in Swedish pulp industry, 1960-1980. [Göteborg, Sweden]: Handelshögskolan vid Göteborgs universitet, 1994.
Cerca il testo completoCapitoli di libri sul tema "Wool Growth"
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Samson, Leslie. "Angora wool production." In Rabbit production, 292–302. 10a ed. Wallingford: CABI, 2022. http://dx.doi.org/10.1079/9781789249811.0022.
Testo completoAbstract (sommario):
Abstract This chapter highlights the different aspects of Angora wool production which includes: wool coat growth and yield; management; wool block (gastric statis); equipment for grooming and wool harvesting; removal of wool; care of shorn rabbits; grading and sorting of Angora wool; and home-spinning of Angora wool.
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Moore, G. P. M. "Growth Factors, Cell-Cell and Cell-Matrix Interactions in Skin during Follicle Development and Growth". In The Biology of Wool and Hair, 351–64. Dordrecht: Springer Netherlands, 1988. http://dx.doi.org/10.1007/978-94-011-9702-1_24.
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Reis, P. J. "The Influence of Absorbed Nutrients on Wool Growth". In The Biology of Wool and Hair, 185–203. Dordrecht: Springer Netherlands, 1988. http://dx.doi.org/10.1007/978-94-011-9702-1_13.
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Oliver, R. F., e C. A. B. Jahoda. "The Dermal Papilla and Maintenance of Hair Growth". In The Biology of Wool and Hair, 51–67. Dordrecht: Springer Netherlands, 1988. http://dx.doi.org/10.1007/978-94-011-9702-1_4.
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Baden, Howard P., Anita Grassi e Joseph Kvedar. "The Effect of the Drug Minoxidil on Hair Growth". In The Biology of Wool and Hair, 217–26. Dordrecht: Springer Netherlands, 1988. http://dx.doi.org/10.1007/978-94-011-9702-1_15.
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Chapman, Ralph E. "Effects of some amino acids and peptide growth factors on wool growth and wool follicle function in sheep". In Amino Acids, 982–90. Dordrecht: Springer Netherlands, 1990. http://dx.doi.org/10.1007/978-94-011-2262-7_123.
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Higgins, T. J., P. A. O’Brien, D. Spencer, H. E. Schroeder, H. Dove e M. Freer. "Potential of Transgenic Plants for Improved Amino Acid Supply for Wool Growth". In The Biology of Wool and Hair, 441–45. Dordrecht: Springer Netherlands, 1988. http://dx.doi.org/10.1007/978-94-011-9702-1_31.
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D’Andrea, R. J., A. V. Sivaprasad, S. Bawden, E. S. Kuczek, L. A. Whitbread e G. E. Rogers. "Isolation of Microbial Genes for Cysteine Synthesis and Prospects for their Use in Increasing Wool Growth". In The Biology of Wool and Hair, 447–64. Dordrecht: Springer Netherlands, 1988. http://dx.doi.org/10.1007/978-94-011-9702-1_32.
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Bullock, D. W., S. Damak, N. P. Jay, H. Y. Su e G. K. Barrell. "Improved Wool Production from Insulin-Like Growth Factor 1 Targeted to the Wool Follicle in Transgenic Sheep". In Transgenic Animals, 507–9. London: CRC Press, 2022. http://dx.doi.org/10.1201/9781003211099-94.
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Gowane, G. R., Y. P. Gadekar, Ved Prakash, Vinod Kadam, Ashish Chopra e L. L. L. Prince. "Climate Change Impact on Sheep Production: Growth, Milk, Wool, and Meat". In Sheep Production Adapting to Climate Change, 31–69. Singapore: Springer Singapore, 2017. http://dx.doi.org/10.1007/978-981-10-4714-5_2.
Testo completoAtti di convegni sul tema "Wool Growth"
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Ku¨rekci, Nuri Alpay, O¨zden Ag˘ra e O¨zlem Emanet. "Determination of Optimum Insulation Thickness for Different Climatic Zones of Turkey". In ASME 2009 International Mechanical Engineering Congress and Exposition. ASMEDC, 2009. http://dx.doi.org/10.1115/imece2009-12586.
Testo completoAbstract (sommario):
Turkey has dynamic economic development and rapid population growth. It also has macro-economic and especially, monetary instability. The net effect of these factors is that Turkey’s energy demand has grown rapidly almost every year and is expected to continue growing. Since 1990, energy consumption has increased at an annual average rate of 4.3%. The energy consumption is distributed among four main sectors which are industrial, building (residential), transportation and agriculture. Approximately 33% of total energy consumption in Turkey is used by residential sector. This situation makes it more important to insulate buildings in our country where fuel prices are too high. Turkey is divided into four climatic zones depending on average temperature degree days of heating. In this study, the four different cities of Turkey, Izmir, Istanbul, Ankara and Erzurum are selected to determine the optimum insulation thickness of the external wall of buildings. Optimum insulation thickness for six different energy sources (Soma coal, natural gas, coal, LPG, fuel-oil, diesel fuel) and two different insulants (extruded polystyrene, rock wool) is calculated and compared to each other. In addition, by using life cycle cost analysis method. Pay back period is calculated for each zone.
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ISMAILOV, Ismail Sagidovich, Nina Vladimirovna TREGUBOVA, Rashid Hasanbievich KOCHKAROV, Anna Victorovna MORGUNOVA e Natalija Alecseevna DRIZHD. "THE RELATIONSHEEP OF AMINO ACID METABOLISM WITH PRODUCTIVITY OF GROWING YOUNG SHEEP". In RURAL DEVELOPMENT. Aleksandras Stulginskis University, 2018. http://dx.doi.org/10.15544/rd.2017.125.
Testo completoAbstract (sommario):
A number of studies on digestion of the ruminants have shown the process of synthesis of all the essential amino acids in the rumen (Abu Fadel, 2004; Trukhachev, V., Zlidnev, N. 2008). However, according to some researches, microbial protein is deficient in methionine and lysine. This assumption also proves the need for further study of the influence of balanced amino acids to these diets on the growth, development and productive performance of the ruminants. Scientific approbation of the issues related to establishing the requirements of young sheep in lysine and methionine with cystine and development of recommendations for their proper balance in animal rations have been conducted along with a series of physiological, scientific and practical experiments. For this purpose, we used the following research methods: preparative, analytical, measuring and calculating. Zootechnical evaluation of young sheep’s diet with different levels of lysine and methionine with cysteine has been conducted, and influence of these components on growth, development, metabolism, the use of amino acids and wool productivity have been studied. The importance of studying the content of amino acids in plasma is evident because they are the indicators of protein metabolism in the animals’ organism and represent themselves the exchange fund when used in the biochemical transformations in the process of updating the protein of the body tissues and the synthesis of animal products. Increase in young sheep’s diet of lysine and methionine can improve their productivity, reduce the cost of feed energy and improve biochemical indexes of meat, taking into account the optimization of its amino acid composition. Efficiency increase of young sheep during the process of the individual development is linked to conditions of feeding and in particular the usefulness of a protein food, which is primarily determined by sufficient intake of essential amino acids - lysine and methionine with cystine. Thus, the inclusion in the diet of growing young sheep some amount of synthetic amino acids – 6–8 grams of lysine and 3–4 g of methionine per 1 fodder unit, enhances oxidation-reduction processes, increase productivity, i.e. wool yield and other indicators. The content of free amino acids in plasma directly depends on their availability in feed. The use of synthetic amino acids (lysine, methionine and cystine) contributed to the increase of their content in a free state in the blood serum, indicating their increased demand in sheep. With the use of different doses of synthetic amino acids (lysine, methionine, cystine) in the diets of young sheep it has been found that the organization of optimum conditions of feeding, care and management of sheep in winter season help to avoid abrupt changes in the structure of the skin, to ensure the normal development of the histological structure and morphogenetic processes.)
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Berechet, Mariana Daniela, Demetra Simion, Maria Stanca, Ciprian Chelaru, Cosmin-Andrei Alexe e Maria Rapa. "The influence of alkaline extraction on some keratin hydrolysates properties". In The 8th International Conference on Advanced Materials and Systems. INCDTP - Leather and Footwear Research Institute (ICPI), Bucharest, Romania, 2020. http://dx.doi.org/10.24264/icams-2020.ii.3.
Testo completoAbstract (sommario):
Keratin is a fibrous protein abundant in nature, being the component of wool, hair, hooves, horns, feathers, and claws. Keratin is one of the most valuable natural biopolymers due to its chemical versatility and biological performance. At the molecular level, keratin is distinguished from other biopolymers by its high concentration of cysteine-containing sulfur. Two keratin hydrolysate batches were obtained in alkaline medium, at a constant concentration of 8% NaOH and 75°C (KerNa875), 85°C (KerNa885), and 95°C (KerNa895), and at a fixed temperature of 99°C and different concentrations of NaOH, i.e. 3% (KerNa399), 5% (KerNa599), and 8% (KerNa899), respectively. Physical-chemical analyses showed that the protein content ranging between 83.60% for KerNa875 and 88.88% for KerNa399, while the total nitrogen was found 13.83% and 14.67% in the case of KerNa875 and KerNa399, respectively. Dynamic light scattering analysis showed that the particle sizes decreased with the increased concentration in the reaction medium. The average particle size was between 1352 nm and 1771 nm for the samples obtained at a temperature of 99°C and with lower values between 463.3 nm and 571.6 nm for the samples obtained with 8% NaOH. The Fourier transform infrared (FT-IR) spectra evidenced the specific bands of keratin-specific proteins and sulfur compounds. Experiments were also performed to evaluate the antioxidant activity and the growth of Tamino and Mirastar wheat plants by applying the treatments with 3% and 5% concentrations of KerNa899 on wheat seeds. These experiments showed an improvement in the wheat plant growth during 10 days of observation compared to control sample. The results recommend the potential use for keratin hydrolysates in the medical, pharmaceutical, cosmetics fields, and also as fertilizers in agriculture.
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Honig, David A., e W. A. Richards. "Why does wood look like wood?" In OSA Annual Meeting. Washington, D.C.: Optica Publishing Group, 1985. http://dx.doi.org/10.1364/oam.1985.wd3.
Testo completoAbstract (sommario):
Three properties of trees produce distinctive visible characteristics of wood: the cylindrical growth rings, the vertical pores, and the radial planes that compartmentalize the tree to protect it from disease or injury. Such a model of a tree was the basis for rendering a wooden surface. With this first approximation, the growth rings will appear as elliptical contours on a planar cut, streaked by dark lines that arise from the rays, and speckled by pores. These three properties of wood capture its salient visual attributes. The particular form of the ring albedo function is not important, nor is it necessary to model the radial rays exactly. We speculate that the pattern of radial rays and elliptical rings, and possibly their intersection, allow the observer to make the inference of wood, for few other natural structures will produce this characteristic surface texture.
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Bergsagel, Dan, e Timothy D. Lynch. "Harvesting New York City - Old-Growth Urban Forestry". In IABSE Congress, New York, New York 2019: The Evolving Metropolis. Zurich, Switzerland: International Association for Bridge and Structural Engineering (IABSE), 2019. http://dx.doi.org/10.2749/newyork.2019.0831.
Testo completoAbstract (sommario):
<p>New York is known as a metropolis of skyscrapers; however less than 1.5% of the 1 million buildings in the city stand over seven stories tall. Over 95% are thought to be of wood-frame or masonry and wood construction.</p><p>Most of this building stock was constructed using wood sourced from old-growth forests across the eastern seaboard. The city now sits on a stockpile of wood which germinated before New Amsterdam became New York, and which was felled while signatories of the Declaration of Independence were still President; this is structurally valuable hard, dense and high strength-to-weight ratio wood. As our buildings degrade and require renovation or replacement the city must ensure that this resource is not wasted, for environmental and economic reasons.</p><p>The total number of buildings is large, but because of the rapid and repetitive way that NYC was constructed the variation in building type and structural element sizes across the building population is small. Cross referencing NYC department databases using geographic information systems allowed the Department of Buildings to produce an estimate of the number of buildings in the city of each type. Assessment of historic pattern books, prescriptive regulations, and inspection of existing buildings allows generic estimates of wood dimension and quantity per building type. Combined, this data allows the estimation of the annual rate of release of wood from demolition in NYC - a predicted supply available for future use. A review of existing practices in wood salvage, processing and reuse is then assessed in context, outlining proposals for future local policy and research work.</p>
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Tafur, Karla B., Jeffrey D. Ritzenthaler, Jesse Roman e Roberto A. Accinelli. "Wood Smoke Stimulates Human Lung Cancer Cell Growth". In American Thoracic Society 2011 International Conference, May 13-18, 2011 • Denver Colorado. American Thoracic Society, 2011. http://dx.doi.org/10.1164/ajrccm-conference.2011.183.1_meetingabstracts.a3903.
Testo completo
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Mishina, N. V. "ОСНОВНЫЕ ТЕНДЕНЦИИ СОВРЕМЕННОГО РАЗВИТИЯ СЕЛЬСКОГО ХОЗЯЙСТВА ПРОВИНЦИИ ХЭЙЛУНЦЗЯН (КНР) В СРАВНЕНИИ С ЮЖНЫМИ РАЙОНАМИ ДАЛЬНЕГО ВОСТОКА". In Geosistemy vostochnyh raionov Rossii: osobennosti ih struktur i prostranstvennogo razvitiia. ИП Мироманова Ирина Витальевна, 2019. http://dx.doi.org/10.33833/tig.2019.35.25.009.
Testo completoAbstract (sommario):
В работе представлены результаты изучения развития сельского хозяйства провинции Хэйлунцзян (КНР) за период с 2000 по 2017 гг. Данная провинция имеет протяженную границу с Дальневосточным федеральным округом РФ и ее сельскохозяйственное освоение является одним из важных факторов экологической безопасности приграничных территорий России. Основой для выполнения исследования являются официальные статистические данные. Для выявления основных изменений в отрасли анализировались такие показатели, как валовое производство сельскохозяйственной продукции, размеры и структура посевных площадей, объемы использования минеральных удобрений, сельскохозяйственное водопользование, поголовье скота и производство продуктов животноводства. Сельское хозяйство провинции Хэйлунцзян КНР активно развивалось в рассматриваемый период, что подтверждается многократным увеличением значения большинства показателей отрасли, а также ростом ее доли в ВРП. В растениеводстве наблюдался сильный перекос в сторону увеличения производства кукурузы и риса, сопровождавшийся значительным расширением посевных площадей, в т.ч. орошаемых, что обусловило рост сельскохозяйственного водопотребления. В животноводстве, кроме традиционного производства мясопродуктов, развитие получило молочное животноводство, производство шерсти, меда, шелковых коконов. В пространственном отношении в последние 17 лет вектор сельскохозяйственного развития в провинции смещался в сторону ранее наименее освоенных приграничных округов, в которых имеется запас пригодных для освоения земель. Сопоставление данных о сельскохозяйственном производстве провинции Хэйлунцзян и в сопредельных районах юга Дальнего Востока России показало рост трансграничных градиентов для большинства показателей, что указывает на более интенсивное развитие отрасли на китайской территории. Сохранение этих тенденций в перспективе означает ухудшение состояния природной среды в провинции, нарастание остроты экологических проблем, увеличение экономического и экологического дисбаланса на приграничных территориях России и КНР. The paper is a general review of the agricultural development of Province Heilongjiang (China) in 20002017. This province has a long border with the Far Eastern Federal District of the Russian Federation and its agricultural development is an important factor of the environmental safety of the border areas of Russia. The basis for the review is the official statistical data. We analyzed such indicators as a gross output value of agricultural production, a size and a structure of sown areas, using mineral fertilizers, the agricultural water use, livestock number and products. Multiple growth of the value of most indicators confirms active development of agriculture in Province Heilongjiang in the period under consideration. The analysis of crop farming data showed a strong shift towards production of corn and rice, significant expansion of the sown area, including the irrigated ones, an increase in agricultural water consumption. In animal husbandry dairy farming and the production of wool, honey, and silk cocoons developed in addition to the traditional production of meat products. Spatially, over the past 17 years, agricultural development has shifted towards the border regions (prefectures) with rather large stock lands suitable for reclamation. The comparison of the agricultural data in Province Heilongjiang and in the south of the Russian Far East showed an increase in crossborder gradients for most indicators meaning more intense agricultural development of the Chinese territory. Continuation of these trends in future means environmental deterioration, intensification of ecological problems, growth of the economic and environmental imbalance in the border areas of Russia and China.
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Mishina, N. V. "ОСНОВНЫЕ ТЕНДЕНЦИИ СОВРЕМЕННОГО РАЗВИТИЯ СЕЛЬСКОГО ХОЗЯЙСТВА ПРОВИНЦИИ ХЭЙЛУНЦЗЯН (КНР) В СРАВНЕНИИ С ЮЖНЫМИ РАЙОНАМИ ДАЛЬНЕГО ВОСТОКА". In Geosistemy vostochnyh raionov Rossii: osobennosti ih struktur i prostranstvennogo razvitiia. ИП Мироманова Ирина Витальевна, 2019. http://dx.doi.org/10.35735/tig.2019.35.25.009.
Testo completoAbstract (sommario):
В работе представлены результаты изучения развития сельского хозяйства провинции Хэйлунцзян (КНР) за период с 2000 по 2017 гг. Данная провинция имеет протяженную границу с Дальневосточным федеральным округом РФ и ее сельскохозяйственное освоение является одним из важных факторов экологической безопасности приграничных территорий России. Основой для выполнения исследования являются официальные статистические данные. Для выявления основных изменений в отрасли анализировались такие показатели, как валовое производство сельскохозяйственной продукции, размеры и структура посевных площадей, объемы использования минеральных удобрений, сельскохозяйственное водопользование, поголовье скота и производство продуктов животноводства. Сельское хозяйство провинции Хэйлунцзян КНР активно развивалось в рассматриваемый период, что подтверждается многократным увеличением значения большинства показателей отрасли, а также ростом ее доли в ВРП. В растениеводстве наблюдался сильный перекос в сторону увеличения производства кукурузы и риса, сопровождавшийся значительным расширением посевных площадей, в т.ч. орошаемых, что обусловило рост сельскохозяйственного водопотребления. В животноводстве, кроме традиционного производства мясопродуктов, развитие получило молочное животноводство, производство шерсти, меда, шелковых коконов. В пространственном отношении в последние 17 лет вектор сельскохозяйственного развития в провинции смещался в сторону ранее наименее освоенных приграничных округов, в которых имеется запас пригодных для освоения земель. Сопоставление данных о сельскохозяйственном производстве провинции Хэйлунцзян и в сопредельных районах юга Дальнего Востока России показало рост трансграничных градиентов для большинства показателей, что указывает на более интенсивное развитие отрасли на китайской территории. Сохранение этих тенденций в перспективе означает ухудшение состояния природной среды в провинции, нарастание остроты экологических проблем, увеличение экономического и экологического дисбаланса на приграничных территориях России и КНР. The paper is a general review of the agricultural development of Province Heilongjiang (China) in 20002017. This province has a long border with the Far Eastern Federal District of the Russian Federation and its agricultural development is an important factor of the environmental safety of the border areas of Russia. The basis for the review is the official statistical data. We analyzed such indicators as a gross output value of agricultural production, a size and a structure of sown areas, using mineral fertilizers, the agricultural water use, livestock number and products. Multiple growth of the value of most indicators confirms active development of agriculture in Province Heilongjiang in the period under consideration. The analysis of crop farming data showed a strong shift towards production of corn and rice, significant expansion of the sown area, including the irrigated ones, an increase in agricultural water consumption. In animal husbandry dairy farming and the production of wool, honey, and silk cocoons developed in addition to the traditional production of meat products. Spatially, over the past 17 years, agricultural development has shifted towards the border regions (prefectures) with rather large stock lands suitable for reclamation. The comparison of the agricultural data in Province Heilongjiang and in the south of the Russian Far East showed an increase in crossborder gradients for most indicators meaning more intense agricultural development of the Chinese territory. Continuation of these trends in future means environmental deterioration, intensification of ecological problems, growth of the economic and environmental imbalance in the border areas of Russia and China.
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Shibasaki, Satoshi, e Hideki Aoyama. "Development of Wood Grain Pattern Design System". In ASME 2009 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2009. http://dx.doi.org/10.1115/detc2009-87094.
Testo completoAbstract (sommario):
Various approaches for generating woodgrain patterns using computer graphics have been proposed so far. However, the generation of various woodgrain patterns with conventional methods is difficult due to the need for the adjustment of numerous parameters to express a real woodgrain pattern. In this paper, a new mathematical approach for generating woodgrain patterns is proposed. Virtual trees are generated by simulating tree growing based on past actual weather information obtained from public organizations, and woodgrain patterns are then acquired by cutting the trunks of the virtual trees. In order to simulate tree growing, growth models of tree are constructed in consideration of dendrological characteristics and environmental conditions. Growth of tree is influenced by various environmental factors, such as sunlight, temperature, carbon dioxide concentration, wind, precipitation, soil nutrient, inclination of ground, survival amongst surrounding trees, etc. With this system, the growth model of trees is constructed based on precipitation, temperature, sunlight, and inclination of ground, which especially have strong effects on tree growth. With this approach, various types of virtual trees can be obtained by changing growth conditions such as period and location of growth without the need to reset complicated parameters of tree species, and then the virtual trees can be cut at arbitrary areas, thus allowing a variety of woodgrain patterns to be easily generated by one parameter setup.
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Xu, Qiang, G. J. Griffin, XuHong Miao, ZhenYu Xu e Y. Jiang. "Study the Characteristics in the Growth Phase of Wood Crib Fires". In ASME 2009 Heat Transfer Summer Conference collocated with the InterPACK09 and 3rd Energy Sustainability Conferences. ASMEDC, 2009. http://dx.doi.org/10.1115/ht2009-88017.
Testo completoAbstract (sommario):
Tests were conducted with ISO 9705 room to investigate the combustion behavior of medium size wood cribs. Cribs were burnt at the center and corner inside ISO room and also under the hood of the ISO room. Effective heat of combustion and increase rate of heat release rate in growth phase is compared for cribs with different nominal heat release rate and in different positions. The relationship between scaled steady mass loss rate and porosity factor of wood crib is quite different from those in literatures. The average effect heat of combustion is 12.18 MJ kg−1, which is close to commonly accepted value 12 MJ kg−1 for wood sample burning with diffusion flame.
Rapporti di organizzazioni sul tema "Wool Growth"
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Willi, Joseph, Keith Stakes, Jack Regan e Robin Zevotek. Evaluation of Ventilation-Controlled Fires in L-Shaped Training Props. UL's Firefighter Safety Research Institute, ottobre 2016. http://dx.doi.org/10.54206/102376/mijj9867.
Testo completoAbstract (sommario):
Investigations of recent firefighter line of duty deaths caused by rapid fire progression have highlighted a deficiency in firefighters’ understanding of how certain tactics affect the fire dynamics of ventilation-controlled fires. Many fires are in a ventilation-limited, decay state by the time firefighters arrive at the scene, meaning that introducing additional ventilation to the environment has the potential to cause rapid and intense fire growth. To more effectively teach firefighters about the potential effects of ventilation on a compartment fire, ventilation-controlled fires should be gener- ated during training. Safely creating such fires while maintaining compliance with NFPA 1403: Standard on Live-Fire Training Evolutions allows instructors to educate students on this important principle of fire dynamics in the training environment. Structures utilized for live-fire training have evolved from typical concrete burn buildings to now include smaller purpose-built props, like those constructed from steel shipping containers or wood and gypsum board. Such props have been embraced by organizations due to their cost-effectiveness and potential to improve fire behavior training. Obtaining a thorough understanding of the capa- bilities and limitations of such props is critical for instructors to convey accurate messages during training and properly prepare firefighters for scenarios they’ll encounter in the field. Experiments were conducted to quantify the fire environment in L-shaped props with different wall constructions. One prop had an interior wall lining of gypsum board over wood studs and fiberglass insulation. The two other props were constructed from metal shipping containers with corrugated steel walls; one had ceilings and walls comprised solely of the corrugated steel, while the other had ceilings and walls comprised of rolled steel sheeting over mineral wool insulation with the corrugated steel wall as its backing. Three fuel packages were compared between the props: one contained furnishings mainly composed of synthetic materials and foam plastics; another contained wooden pallets and straw; and the third contained wooden pallets, straw, and oriented strand board (OSB). A stochastic approach was used to compare data between replicate tests and quantify the repeatability of the different props and fuel packages, all of which were deemed sufficiently repeatable. Comparisons of data between the three props revealed that thermal conditions between experiments in the two metal props were indistinguishable, suggesting that the additional layer of insulation did not significantly alter the fire environment. Additionally, thermal conditions in the gypsum-lined prop were more severe than those in the metal props. The effects of ventilation changes on fire conditions were also analyzed across various prop and fuel load combinations. Lastly, the response of the thermal environment in each prop during interior suppression was evaluated, and the results implied that the thermal exposure to the firefighter was more severe in the metal props than the gypsum prop for a brief period following the start of suppression.
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Gootwine, Elisha, David Thomas, Ruth Braw-Tal, Amir Bor e P. J. Dziuk. Improvement of Prolificacy of Israeli and U.S. Sheep Breeds through Inclusion of the F Gene of the Booroola Merino-Stage II. United States Department of Agriculture, maggio 1995. http://dx.doi.org/10.32747/1995.7604931.bard.
Testo completoAbstract (sommario):
The purposes of this project were: 1) to introduce the FecB gene to the Awassi and Assaf breeds in Israel and the Rambouillet breed in the U.S.A. aiming in the long run to establish Awassi, Assaf and Rambouillet nucclei breeding flocks homozygous for the F gene in which the contribution of the Booroola Merino genetic background will be less than 10%; (In the U.S., Booroola crosses with Suffolk and Targhee were also studied. 2) to evaluate the effect of the FecB gene and different proportions of Booroola Merino genetic background on lamb survival, growth, milk production and wool production in Booroola crosses with the native breeds; 3) to reveal the specific effect of the FecB gene on ovarian development, follicle stimulating hormone (FSH) and inhibin secretion in prepubertal ewe lambs and in adult ewes in order to define physiological criteria for distinguishing carriers of the FecB allele from non-carriers and 4) to identify genetic markers linked to the FecB gene to assist in selection of genotypes within the Booroola crosses. Introgression of the Booroola gene reached the stage of the third backcross in the Awassi, Assaf and the Rambouillet crosses. In all cases the Booroola crosses were superior in prolificacy. However, they were inferior in comparison to the local breeds in production due to Booroola Merino genes other than the FecB. It is expected that the beneficial economic contribution of the Booroola gene will increase along with the upgrading to the local breeds. FSH plasma levels and induced ovulation rate of 5 month old FecB carriers among the crossbreeds. The OarAE101 marker can assist in detecting FecB carriers among Booroola-Awassi crosses. However, this marker is informative only in some of the families.
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Provenza, Frederick, Avi Perevolotsky e Nissim Silanikove. Consumption of Tannin-Rich Forage by Ruminants: From Mechanism to Improved Performance. United States Department of Agriculture, aprile 2000. http://dx.doi.org/10.32747/2000.7695840.bard.
Testo completoAbstract (sommario):
Trees and shrubs are potentially important sources of food for livestock in many parts of the world, but their use is limited by tannins. Tannins reduce food intake by decreasing digestibility or by causing illness. Supplementing cattle, sheep, and goats with polyethylene glycol (PEG), which has a high affinity for binding tannins and thus attenuating their aversive effects, increases intake of high-tannin foods and improves weight gains and wool growth. The objectives of this proposal were: Objective 1: To further delineate the conditions under which PEG affects intake of high-tannin foods. Objective 2: To ascertain if animals self-regulate intake of PEG in accord with the tannin content of their diet under pen, paddock, and field conditions. Objective 3: To determine how nutritional status and PEG supplementation affect preference for foods varying in nutrients and tannins. Objective 4: To assess the effects of PEG on food selection, intake, and livestock performance in different production systems. The results from this research show that supplementing livestock with low doses of PEG increases intake of high-tannin foods and improves performance of cattle, sheep, and goats. Neutralizing the effects of tannins with supplemental PEG promotes the use of woody species usually considered useless as forage resources. Supplementing animals with PEG has the potential to improve the profitability - mainly milk production - of high-yielding dairy goats fed high-quality foods and supplemented with browse in Mediterranean areas. However, its contribution to production systems utilizing low-yielding goats is limited. Our findings also support the notion that supplemental PEG enhances the ability of livestock to control shrub encroachment and to maintain firebreaks. However, our work also suggests that the effectiveness of supplemental PEG may be low if alternative forages are equal or superior in nutritional quality and contain fewer metabolites with adverse effects.
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Pong, W. Y., Dale R. Waddell e Lambert Michael B. Wood density-moisture profiles in old-growth Douglas-fir and western hemlock. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Research Station, 1986. http://dx.doi.org/10.2737/pnw-rp-347.
Testo completo
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Brackley, Allen M., e Daniel J. Parrent. Production of wood pellets from Alaska-grown white spruce and hemlock. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Research Station, 2011. http://dx.doi.org/10.2737/pnw-gtr-845.
Testo completo
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Mawassi, Munir, Adib Rowhani, Deborah A. Golino, Avichai Perl e Edna Tanne. Rugose Wood Disease of Grapevine, Etiology and Virus Resistance in Transgenic Vines. United States Department of Agriculture, novembre 2003. http://dx.doi.org/10.32747/2003.7586477.bard.
Testo completoAbstract (sommario):
Rugose wood is a complex disease of grapevines, which occurs in all growing areas. The disease is spread in the field by vector transmission (mealybugs). At least five elongated-phloem- limited viruses are implicated in the various rugose wood disorders. The most fully characterized of these are Grapevine virus A (GV A) and GVB, members of a newly established genus, the vitivirus. GVC, a putative vitivirus, is much less well characterized than GV A or GVB. The information regarding the role of GVC in the etiology and epidemiology of rugose wood is fragmentary and no sequence data for GVC are available. The proposed research is aimed to study the etiology and epidemiology of rugose wood disease, and to construct genetically engineered virus-resistant grapevines. The objectives of our proposed research were to construct transgenic plants with coat protein gene sequences designed to induce post-transcriptional gene silencing (pTGS); to study the epidemiology and etiology of rugose wood disease by cloning and sequencing of GVC; and surveying of rugose wood- associated viruses in Californian and Israeli vineyards. In an attempt to experimentally define the role of the various genes of GV A, we utilized the infectious clone, inserted mutations in every ORF, and studied the effect on viral replication, gene expression, symptoms and viral movement. We explored the production of viral RNAs in a GV A-infected Nicotiana benthamiana herbaceous host, and characterized one nested set of three 5'-terminal sgRNAs of 5.1, 5.5 and 6.0 kb, and another, of three 3'-terminal sgRNAs of 2.2, 1.8 and 1.0 kb that could serve for expression of ORFs 2-3, respectively. Several GV A constructs have been assembled into pCAMBIA 230 I, a binary vector which is used for Angrobacterium mediated transformation: GV A CP gene; two copies of the GV A CP gene arranged in the same antisense orientation; two copies of the GV A CP gene in which the downstream copy is in an antigens orientation; GV A replicase gene; GV A replicase gene plus the 3' UTR sequence; and the full genome of GV A. Experiments for transformation of N. benthamiana and grapevine cell suspension with these constructs have been initiated. Transgenic N. benthamiana plants that contained the CP gene, the replicase gene and the entire genome of GV A were obtained. For grapevine transformation, we have developed efficient protocols for transformation and successfully grapevine plantlets that contained the CP gene and the replicase genes of GV A were obtained. These plants are still under examination for expression of the trans genes. The construction of transgenic plants with GV A sequences will provide, in the long run, a means to control one of the most prevalent viruses associated with grapevines. Our many attempts to produce a cDNA library from the genome of GVC failed. For surveying of rugose wood associated viruses in California vineyards, samples were collected from different grape growing areas and tested by RT-PCR for GV A, GVB and GVD. The results indicated that some of the samples were infected with multiple viruses, but overall, we found higher incidence of GVB and GV A infection in California vineyards and new introduction varieties, respectively. In this research we also conducted studies to increase our understanding of virus - induced rootstock decline and its importance in vineyard productivity. Our results provided supporting evidence that the rootstock response to virus infection depends on the rootstock genotype and the virus type. In general, rootstocks are differ widely in virus susceptibility. Our data indicated that a virus type or its combination with other viruses was responsible in virus-induced rootstock decline. As the results showed, the growth of the rootstocks were severely affected when the combination of more than one virus was present.
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Parresol, Bernard R., e Fuliang Cao. An Investigation of Crystalline Intensity of the Wood of Poplar Clones Grown in Jiangsu Province, China. Asheville, NC: U.S. Department of Agriculture, Forest Service, Southern Research Station, 1998. http://dx.doi.org/10.2737/srs-rp-011.
Testo completo
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Parresol, Bernard R., e Fuliang Cao. An Investigation of Crystalline Intensity of the Wood of Poplar Clones Grown in Jiangsu Province, China. Asheville, NC: U.S. Department of Agriculture, Forest Service, Southern Research Station, 1998. http://dx.doi.org/10.2737/srs-rp-11.
Testo completo
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Granot, David, Scott Holaday e Randy D. Allen. Enhancing Cotton Fiber Elongation and Cellulose Synthesis by Manipulating Fructokinase Activity. United States Department of Agriculture, 2008. http://dx.doi.org/10.32747/2008.7613878.bard.
Testo completoAbstract (sommario):
a. Objectives (a) Identification and characterization of the cotton fiber FRKs; (b) Generating transgenic cotton plants overproducing either substrate inhibited tomato FRK or tomato FRK without substrate inhibition; (c) Generating transgenic cotton plants with RNAi suppression of fiber expressed FRKs; (d) Generating Arabidopsis plants that over express FRK1, FRK2, or both genes, as additional means to assess the contribution of FRK to cellulose synthesis and biomass production. b. Background to the topic: Cellulose synthesis and fiber elongation are dependent on sugar metabolism. Previous results suggested that FRKs (fructokinase enzymes that specifically phosphorylate fructose) are major players in sugar metabolism and cellulose synthesis. We therefore hypothesized that increasing fructose phosphorylation may enhance fiber elongation and cellulose synthesis in cotton plants. Accordinlgy, the objectives of this research were: c. Major conclusions and achievements: Two cotton FRKs expressed in fibers, GhFRK2 and GhFRK3, were cloned and characterized. We found that GhFRK2 enzyme is located in the cytosol and GhFRK3 is located within plastids. Both enzymes enable growth on fructose (but not on glucose) of hexose kinase deficient yeast strain, confirming the fructokinase activity of the cloned genes. RNAi constructs with each gene were prepared and sent to the US collaborator to generate cotton plants with RNAi suppression of these genes. To examine the effect of FRKs using Arabidopsis plants we generated transgenic plants expressing either LeFRK1 or LeFRK2 at high level. No visible phenotype has been observed. Yet, plants expressing both genes simultaneously are being created and will be tested. To test our hypothesis that increasing fructose phosphorylation may enhance fiber cellulose synthesis, we generated twenty independent transgenic cotton plant lines overexpressing Lycopersicon (Le) FRK1. Transgene expression was high in leaves and moderate in developing fiber, but enhanced FRK activity in fibers was inconsistent between experiments. Some lines exhibited a 9-11% enhancement of fiber length or strength, but only one line tested had consistent improvement in fiber strength that correlated with elevated FRK activity in the fibers. However, in one experiment, seed cotton mass was improved in all transgenic lines and correlated with enhanced FRK activity in fibers. When greenhouse plants were subjected to severe drought during flowering and boll development, no genotypic differences in fiber quality were noted. Seed cotton mass was improved for two transgenic lines but did not correlate with fiber FRK activity. We conclude that LeFRK1 over-expression in fibers has only a small effect on fiber quality, and any positive effects depend on optimum conditions. The improvement in productivity for greenhouse plants may have been due to better structural development of the water-conducting tissue (xylem) of the stem, since stem diameters were larger for some lines and the activity of FRK in the outer xylem greater than observed for wild-type plants. We are testing this idea and developing other transgenic cotton plants to understand the roles of FRK in fiber and xylem development. We see the potential to develop a cotton plant with improved stem strength and productivity under drought for windy, semi-arid regions where cotton is grown. d. Implications, scientific and agricultural: FRKs are probably bottle neck enzymes for biomass and wood synthesis and their increased expression has the potential to enhance wood and biomass production, not only in cotton plants but also in other feed and energy renewable plants.
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Stakes, Keith, e Joseph Willi. Study of the Fire Service Training Environment: Safety, Fidelity, and Exposure -- Acquired Structures. UL Firefighter Safety Research Institute, marzo 2019. http://dx.doi.org/10.54206/102376/ceci9490.
Testo completoAbstract (sommario):
Previous FSRI led research projects have focused on examining the fire environment with regards to current building construction methods, synthetic fuel loading, and best-practices in firefighting strategies and tactics. More than 50 experiments have been previously conducted utilizing furniture to produce vent-limited fire conditions, replicating the residential fire environment, and studying the methods of horizontal ventilation, vertical ventilation, and positive pressure attack. Tactical considerations generated from the research are intended to provide fire departments with information to evaluate their standard operating procedures and make improvements, if necessary, to increase the safety and effectiveness of firefighting crews. Unfortunately, there still exists a long standing disconnect between live-fire training and the fireground as evident by continued line of duty injury and death investigations that point directly to a lack of realistic yet safe training, which highlights a continued misunderstanding of fire dynamics within structures. The main objective of the Study of the Fire Service Training Environment: Safety, Fidelity, and Exposure is to evaluate training methods and fuel packages in several different structures commonly used across the fire service to provide and highlight considerations to increase both safety and fidelity. This report is focused on the evaluation of live-fire training in acquired structures. A full scale structure was constructed using a similar floor plan as in the research projects for horizontal ventilation, vertical ventilation, and positive pressure attack to provide a comparison between the modern fire environment and the training ground. The structure was instrumented which allowed for the quantification of fire behavior, the impact of various ventilation tactics, and provided the ability to directly compare these experiments with the previous research. Twelve full scale fire experiments were conducted within the test structure using two common training fuel packages: 1) pallets, and 2) pallets and oriented strand board (OSB). To compare the training fuels to modern furnishings, the experiments conducted were designed to replicate both fire and ventilation location as well as event timing to the previous research. Horizontal ventilation, vertical ventilation, and positive pressure attack methods were tested, examining the proximity of the vent location to the fire (near vs. far). Each ventilation configuration in this series was tested twice with one of the two training fuel loads. The quantification of the differences between modern furnishings and wood-based training fuel loads and the impact of different ventilation tactics is documented through a detailed comparison to the tactical fireground considerations from the previous research studies. The experiments were compared to identify how the type of fuel used in acquired structures impacts the safety and fidelity of live-fire training. The comparisons in this report characterized initial fire growth, the propensity for the fire to become ventilation limited, the fires response to ventilation, and peak thermal exposure to students and instructors. Comparisons examined components of both functional and physical fidelity. Video footage was used to assess the visual cues, a component of the fire environment that is often difficult to replicate in training due to fuel load restrictions. The thermal environment within the structure was compared between fuel packages with regards to the potential tenability for both students and instructors.