Wall Grass 3d Model Free Download
Lex Mumphrey
A key aspect of plant growth is the synthesis and deposition of cell walls. In specific tissues and cell types including xylem and fiber, a thick secondary wall composed of cellulose, hemicellulose, and lignin is deposited. Secondary cell walls provide a physical barrier that protects plants from pathogens, promotes tolerance to abiotic stresses, and fortifies cells to withstand the forces associated with water transport and the physical weight of plant structures. Grasses have numerous cell wall features that are distinct from eudicots and other plants. Study of the model species Brachypodium distachyon has helped us begin to understand the internal and external cues that regulate the synthesis of grass secondary cell walls. In this dissertation, I investigate the function of two transcription factors in regulating cell wall biosynthesis, SWIZ and KNOB7. SWIZ controls wall synthesis and plant growth in response to external mechanical force. In response to touch, SWIZ protein moves into the nucleus, a translocation that is modulated by the level of bioactive gibberellic acid in the cell. Positive and negative perturbation of SWIZ results in shorter plants with thicker fiber cell walls, phenotypes that are enhanced in plants treated with regular mechanical stimulus during growth. KNOB7 is orthologous to the characterized cell wall regulator AtKNAT7 in Arabidopsis thaliana. KNOB7 negatively regulates fiber wall thickness and lignification, as is observed in AtKNAT7, but KNOB7 shows unique control of lignin composition, hydroxycinnamic acid content, and cell wall polysaccharide content. These observations may reflect control of grass specific cell wall characteristics not present in eudicots, such as high levels of wall bound hydroxycinnamic acids and the prevalence of heteroxylan polysaccharides. Together, these insights from SWIZ and KNOB7 function further our understanding of how grasses regulate their growth and secondary cell wall synthesis.
BackgroundBiofuels derived from lignocellulosic plant material are an important component of current renewable energy strategies. Improvement efforts in biofuel feedstock crops have been primarily focused on increasing biomass yield with less consideration for tissue quality or composition. Four primary components found in the plant cell wall contribute to the overall quality of plant tissue and conversion characteristics, cellulose and hemicellulose polysaccharides are the primary targets for fuel conversion, while lignin and ash provide structure and defense. We explore the genetic architecture of tissue characteristics using a quantitative trait loci (QTL) mapping approach in Panicum hallii, a model lignocellulosic grass system. Diversity in the mapping population was generated by crossing xeric and mesic varietals, comparative to northern upland and southern lowland ecotypes in switchgrass. We use near-infrared spectroscopy with a primary analytical method to create a P. hallii specific calibration model to quickly quantify cell wall components.ResultsAsh, lignin, glucan, and xylan comprise 68% of total dry biomass in P. hallii: comparable to other feedstocks. We identified 14 QTL and one epistatic interaction across these four cell wall traits and found almost half of the QTL to localize to a single linkage group.ConclusionsPanicum hallii serves as the genomic model for its close relative and emerging biofuel crop, switchgrass (P. virgatum). We used high throughput phenotyping to map genomic regions that impact natural variation in leaf tissue composition. Understanding the genetic architecture of tissue traits in a tractable model grass system will lead to a better understanding of cell wall structure as well as provide genomic resources for bioenergy crop breeding programs.
Grasses have for millennia provided humans with food, feed, and fiber. In addition, grasses are increasingly becoming a source of fuel. To replace a substantial portion of our current petroleum usage, species such as switchgrass (Panicum virgatum) and Miscanthus (Miscanthus x giganteus) are being developed as dedicated bioenergy crops. The photosynthetically fixed carbon in plant tissues can be converted into liquid fuels compatible with the current transportation infrastructure. Achieving cost-effective and environmentally sustainable production of plant-derived biofuels will, however, require advances in our understanding of plant biology, as well as genetic improvements of the plants themselves.
Research in our lab centers on achieving a clearer understanding of bioenergy-relevant traits, including cell wall composition, structure, and dynamics. To elucidate the genes controlling these traits, we use the model plant Brachypodium distachyon. Related to wheat and native to the Mediterranean region, Brachypodium is a small, annual grass with a compact, sequenced genome and abundant genetic resources. Brachypodium also exhibits tremendousnatural variation in traits important for bioenergy. To mine this diversity, we are performing extensive phenotyping, including a microbial, simultaneous saccharification and fermentation assay to test how well plant material is converted to ethanol and other products. We are combining these data with an emerging wealth of genome sequence information to map the genetic loci underlying the phenotypic diversity. By elucidating biomass quantity and quality traits in a model grass, we aim to contribute to the knowledge base necessary to improve plants for sustainable bioenergy production.
Details: Easy to install just peel and paste on wall by arranging design like puzzle. Step 1: Preparation installation, the surface you wish to attach your decal to must first be clean and free from dust, grease or any other contamination. Freshly painted or lacquered surfaces must be allowed to completely cure before the decal is applied. We recommend waiting a minimum of 2 to 3 weeks. Step 2: Peel and stick simply peel those wall stickers off from backing paper and apply them on the design area. Step 3: Press firmly to squeeze out any air bubbles. Grab a cloth and give wall sticker few wipe down to ensue each wall sticker is firmly stick to the surface.
We offer many life-like permanent botanical designs that will complement. Other add-ons include wall mount planters, permanent green/ moss walls and vertical artwork (all sold separately). Liner required for live plants. Crating included. Indoor only.
Educators have long used tactile learning concepts to teach students with low-vision. In the early 20th century, schools for the blind incorporated scale models of historic structures into their lesson plans. Students used these tactile models to feel their way through history and imagine the spaces of the past. The museum's collection includes a wooden tactile model of the main house at George Washington's Mount Vernon plantation. The model was used by students at the Michigan School for the Blind during the late 1930s.
The tactile model may not offer an exact replica of the mansion, but it does offer advantages the original site cannot. By holding the president's home, students can grasp the intricacies and details of colonial spaces. They can learn nuances inexpressible in only written or visual depictions. Tactile models allow people to take the past into their own hands.
Exhibitions that are both accessible to people who are blind and also highly interactive literally go hand-in-hand. The Penn Museum in Philadelphia used tactile techniques in its "Insights into Ancient Egypt" touch tour program to bring to life the wonders of ancient Egypt. Docents with different visual abilities led the tours, and visitors were able to handle replicas of ancient Egyptian tools used in mummification. The art world has also begun to incorporate tactile features into the curation of renowned paintings. The Museo del Prado in Madrid has started to exhibit three-dimensional copies of its masterpieces. These models allow visitors to trace the elaborate contours of famous paintings with their bare hands.
The advancements of digital technology have further increased the viability of tactile exhibitions. In an analog world, curators could only print their information on flat, two-dimensional surfaces that neither helped people with low vision nor promoted active engagement. Text can be boring regardless of visual ability. Modern three-dimensional printing allows curators to print accurate replicas or scaled versions of their rare artifacts. Curators can use the technology to produce easily duplicated models that people can touch. This allows visitors to interact with an exhibition's objects while ensuring the safety of the original pieces. Museums can appeal to wider audiences while also preserving their collections. The Smithsonian has already started to use three-dimensional printing to interpret the Cooper Hewitt Mansion. Tactile exhibitions can effectively reconcile the interests of museum visitors with the preservation obligations of museum staff.
One of the challenges with tactile models is that they are often produced for people with low-vision by people who have high-vision. The models make sense to people who can see them, but do they make sense to people who can only touch them? Designers can overcome this discrepancy chiefly through outreach and collaboration. By including people with low-vision in the production process, designers with high-vision can better translate their visual knowledge into the spatial frameworks of low-vision thinkers. Tactile models function as an interface between cultures of perception. One perspective does not take precedence over another. Tactile exhibitions can initiate dialog between people with different understandings of the world. Together, they can create new perspectives of the past.
Nonetheless, tactile-based exhibitions do not offer a perfect panacea for the problems of curation. No technical approach can eliminate the controversies of interpreting human culture. For example, the tactile model of Mount Vernon reflects the prejudiced paradigms of its era. In the early 20th century, American schools and museums privileged the lives of famous founding fathers over the experiences of ordinary people, women, and people of color. In the 21st century, educators and museum staff must also represent the people who labored to build and maintain such imposing structures. Professional staff can still present a model of George Washington's mansion to the public, but they must also take into account the slave cabins where most of Mount Vernon's inhabitants lived and the inequality that facilitated Washington's opulence. Tactile models present an excellent tool for museum curators, but tactile exhibitions are only as effective as the messages they convey.
760c119bf3