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Psycnodysostosis is a kind of a genetic disease characterised by short physique and that opens a window into how the joints could be destroyed by arthritis.
Cathepsin K has been studied largely using mouse pointers to study its role in bone metabolism. The study took place in the Helsinki University Central Hospital in Finland and it involved a 55 year old patient suffering from Psycnodysostosis and also developed psoriatic arthritis(which is similar to psoriasis – a kind of a skin and nail disease). In the view of the fact that the patient lacked the Cathepsin K because of her condition, the researchers concluded that this would further protect her from bone erosions in the hands and the feet. Extensive blood analysis was conducted to examine the enzymes that are responsible for breaking down proteins. Mushroom cultivation in more developed countries has evolved from an art into huge agri-business by way of the most innovative production technology and biotechnology available. West Africa exemplifies this problem, and a low cost mushroom production program would have compounded benefits for the region.
The oyster mushroom complex (Pleurotus ostreatus and other Pleurotus and Hypsizygus species) appear to be the best candidates for production in the West African climate.
The purpose of this paper is to present low-cost, low-technology methods applicable to small-scale village mushroom production. This paper presents the first step in this expanded cultivation scheme, which is Mushroom Production through utilization of low cost, technologically simple methods that can be easily implemented at the village level in any country, be it highly developed or the poorest country on earth.
A word on species and strains: There are many a€?Oysterequea€? mushrooms, with similar growth characteristics, morphology (looks) edibility, flavor, shelf life, etc. Choosing the best species and strains of Oyster mushrooms is the single most important step in creating a successful mushroom cultivation program.
For the purpose of this research, we choose several strains of oyster mushrooms to indicate the possibility of different strains being utilizable in this cultivation method, and to show that the results obtained in this research were not strain specific.
The most basic concept of mushroom cultivation is that we need to produce an environment in the substrate that is selectively preferential to the growth of our target species of mushroom, and less amenable to other types of microorganisms and pests. Another potential treatment method is simply to soak the substrate in water for a week or so. Unshredded wheat straw (whole stalk), shredded wheat straw (reduced in a hammer mill to small particle size).
Although there are several fungi capable of white rot degradation, the following genus and species in the Tricholomataceae family were used in this experiment: Pleurotus pulmonarius AX strain, Hypsizygous ulmarium ELM 1 strain, Pleurotus Da€™jamor PDJ strain, Pleurotus Sajar-caju PSAJ strain, and Pleurotus ostreatus TL strain.
Spawn is the seed stock which is used for inoculating the substrate for mushroom production. The growing bags in this research were spawned with the addition of 454 g (one pound) of spawn per bag, added alternately with a layer of straw as the bags were filled. Clear polyethylene bags of approx 300 mm x 700 mm x 2 mil thickness were used as growing containers for this experiment. A control batch of substrate for comparisons was made by first soaking the whole straw for 24 hours in barrels of water, and then draining the straw by setting it on racks and covering by newspaper for two hours resulting in approx.
A second method of substrate conditioning used was the natural fermentation of one bale of wheat straw (approx. After soaking in the above solutions for 24 hrs, the straw was laid out on top of large metal racks and drained in the same manner as the fermented straw. When shredding the straw for the second portion of this experiment, dry straw was run through a 50 HP Jacobsen Hammer Mill for shredding. In addition, a drum containing 118 mL bleach was mixed with 200L water and filled with shredded maize cob. Observations were taken bi-weekly in order to note the difference and similarities between growth for each treatment method and individual strains. Bags that became overly contaminated by bacteria or competitive molds, were weighed using an accurate lab scale (Yamato Corp.
Biological efficiencies (BE) for each strain were attained by dividing the average fresh weight totals for that treatment method and strain type by the average dry weight of substrate and multiplied by 100. In the third world, protein-energy malnutrition (PEM) affects 500 million people and kills 10 million annually. In countries that suffer from widespread protein deficiency, available potential food sources are generally full of plant fibers from the terrestrial biomass. As will be seen from the graphs and illustrations, this experiment clearly shows the practicality of raising mushrooms on low cost (or free) agricultural waste such as straw, that has been treated by simple and low cost methods such as soaking with a bit of lime or washing powder.
The results of this experiment show no significant difference between the mushroom marketability and characteristics such as fruit body, yield, taste, color, smell, etc.
Implementing a low tech mushroom farming approach and low cost mushroom production program in West Africa would have compounded benefits for the region.
The oyster mushroom complexes used for this experiment appear to be one of the best candidates for production in the West African climate. Other studies have been successful in revealing semi-low-tech methods for recycling agricultural waste and utilizing white-rot fungi for the production of fodder for ruminants which showed fast and reliable conditioning of the substrate. Many of the graphs employed are calculated using the values found for biological efficiency (BE). Figure 1a shows a direct comparison between the Bio efficiencies of shredded straw to regular unshredded straw for each of the representative Pleurotus strains, AX, ELM, PDJ, and PSAJ using an autoclave for the steam sterilization method (122 A°C 1 bar pressure). Figure 1b shows the Bleach treatment comparison between unshredded and shredded straw using 710 ml bleach diluted with 200L water.
Figure 1b shows a direct comparison between the Bio efficiencies of shredded straw to regular unshredded straw for each of the representative Pleurotus strains, AX, ELM, PDJ, and PSAJ using the 708 ml bleach to 200L of water sterilization method. Figure 1c shows the Lime treatment comparison between unshredded and shredded straw using 355 g lime diluted with 200 L water. Figure 1c shows a direct comparison between the Bio efficiencies of shredded straw to regular unshredded straw for each of the representative Pleurotus strains, AX, ELM, PDJ, and PSAJ using the 355 ml lime to 200L of water sterilization method.
Figure 1d shows the Tide brand washing powder treatment comparison between the unshredded and shredded straw using the 118.3 ml tide washing powder diluted with 200 L water. Figure 1d shows a direct comparison between the Bio efficiencies of shredded straw to regular unshredded straw for each of the representative Pleurotus strains, AX, ELM, PDJ, and PSAJ using the 118.3 ml tide to 200L of water sterilization method. Figure 2 shows the direct biological efficiency comparisons for shredded straw versus unshredded straw for each of the four test strains used. Figure 2 shows the direct comparison of Bio-efficiencies for each of the four Pleurotus strains grown using the four treatment methods for shredded straw versus regular straw. Figure 3 shows a direct comparison between the quantity of fruit bodies (fresh weight) picked in grams for both the unshredded and shredded straw for each of the treatment methods Steam, Lime, Bleach, and Washing Powder. Figure 3 shows a direct comparison between the amount of fruit bodies (fresh weight) picked, in grams, for both the regular unshredded and shredded straw for each of the treatment methods Steam, Lime, Bleach, and Tide.
Figure 4 shows the comparative all-strain average biological efficiencies for each treatment method for both the regular unshredded and shredded straw substrates. Figure 4 shows the comparative all-strain average bio-efficiencies for each treatment method for both the regular unshredded and shredded straw substraights.
Figure 5 shows the average biological efficiencies of both unshredded straw and shredded straw substrates for each representative strain. Figure 5 shows the average bio-efficiencies of both regular unshredded straw and shredded straw substrates for each representative Pleurotus strain.
Figure 7 shows representative pictures of fruitbodies growing on unshredded straw treated with the four representative treatment methods. Figure 7 shows representative pictures of fruitbodies growing on regular unshredded straw treated with the four representative treatment methods.
Until now each farm cultivation operation has almost always been looked upon as a a€?stand alonea€? operation, which is an operation complete in and of itself, whether it be for plants, animals or fish. If you wash your linen onsite, you can purchase all your laundry products from Ultimate Supplies.
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However, there are still less-developed areas of the world where access to these technological advances are either unavailable or too expensive to utilize. This process would allow the use of secondary crops to be produced in a short time frame from agricultural by-products derived from the primary agriculture of the region, such as millet and sorghum straw, cassava peelings, or virtually any other cellulose source. These mushrooms are primary cellulose decomposers, and can grow on almost any plant material substrate including banana waste, coffee residue, sugar cane baggasse, paper or cardboard waste, river grass, sawdust and nearly all other agricultural waste. The process obtained from this research represents the least training and smallest capital and infrastructure investment to implement a mushroom farming operation, while suggesting the easiest system to grow locally acclimatized mushroom strains for a large and valued mushroom crop in the shortest possible time with minimal financial risk for the farmers.
Reliable supplies of low cost, nutritious and readily available food for the population are the key items to a stable and healthy society. Our main goals in this research were to develop real world solutions to the problems faced in implementing these cultivation systems.
The cell wall structure of virtually all plants is a fibrous structure composed of cellulose and hemicellulose, surrounded by a structural compound called lignin.
Some of these are very closely related to each other, even being given the same genus and species name such as the common tree oyster, Pleurotus ostreatus.

There is no one strain that is any better than another strain, it all just depends on the climate and the substrate and the cultivation methods used. It should not be assumed that the results shown here will necessarily transfer 100% to another location, strain or substrate, although the general guidelines shown here will certainly apply.
This involves sterilization (completely killing any other organisms that are present in the substrate which would compete with the mushrooms for utilization of the substrate as food) or pasteurization (killing off the majority of competitive organisms). This results in a rapid bloom of the bacteria that rapidly consume the readily available simple sugars.
Wheat straw is the post-harvest stalk of Triticum aestivum and Ground maize cob (Zea mays) were used as the substrates. All cultures used in this research are commercially used in mushroom farming, and were all provided by Aloha Medicinals Inc. The spawn for this research was generated under the usual conditions which will be known to anyone familiar with spawn production.
In this research 2.73 kg (6 pounds) of treated straw was added to a growing bag for each strain and treatment type.
The layers of straw were approx 50 mm thick, then a sprinkling of spawn, before adding the next layer of straw, followed by another layer of spawn until the bags were full. The bags were filled with substrate and spawn, with the excess air squeezed out and the bags sealed by twisting a short metal wire or twine around the top. The shredded straw was soaked and processed in the same fashion as the regular unshredded straw.
Once the maize cob was sufficiently drained of excess water by straining through small mesh chicken wire, the material was filled into identical growing bags and spawned. Characteristics noted included the amount of straw sprouts, bacterial contamination, competitive mold contamination, mycelial growth, number of primordial formation (not yet matured fruitbodies called pins) and fruitbody clusters, and the weight of the harvest. Colorado Springs, CO 80906) and disposed of immediately to avoid contamination of the remaining bags.
Wood and straw make up about 80% of this biomass, which equates to approximately 800 billion tons worldwide, an extremely large reservoir. In fact, the yields seen with these low cost treatment methods were not substantially different than the results seen in the steam treated control group. This process would allow the use of secondary crops to be produced in a short time frame from agricultural by-products derived from the primary agriculture of the region.
BE is the amount of growth determined by a comparison between the dry weight of substrate compared to the fresh weight of the mushrooms harvested.
Steam treatment was used as a control in this experiment for both shredded and unshredded straw as it is a known and regularly used method for substrate sterilization. As seen in this graph, none of the regular unshredded straw strains for any of the treatment methods reached a biological efficiency higher than 80% while none of the shredded straw strains reached a biological efficiency lower than 83.20%.
This graph includes only representative Pleurotus strains grown on both the shredded and unshredded substrate. The pictures in this figure can be compared to the pictures in figure 6 in order to see the difference in growth between shredded and unshredded straw when used as the substrate.
World Health Organization, Food and Agriculture Organization of the United Nations , United Nations University.
Gastrojejunal kinetics and the digestion of [15N] beta-lacto globulin and casein in humans: the influence of the nature and quantity of the protein.
Gaudichon C, Bos C, Morens C, Petzke KJ, Mariotti F, Everwand J, Benamouzig R, Dare S, Tome D, Metges CC.
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Until this basic need is met, poverty alleviation and economic development cannot take place.
It is easy to imagine a system where if you have capital resources of X, Y and Z, you can achieve great results, but what about those peoples that do not have even the minimum resources of X, Y and Z? Plants take simple compounds like water and carbon dioxide and using sunlight as energy they assemble these into complex organic compounds such as proteins, carbohydrates and fats. However, not all Tree oysters are completely alike even though they may have the same genus and species name. The only way to determine the best species and strain for growing in any particular situation is to experiment with several types of Oyster mushrooms and record the production time and yield for each strain in that particular circumstance. Anyone desiring to follow this methodology of mushroom cultivation is encouraged to experiment with different species and strains, and to include locally acclimatized strains whenever possible.
Once the sugars are exhausted after about 5 days of fermentation, the bacterial bloom dies off due to lack of any more simple nutrient availability. All treatment methods and strains were done in triplicate time three, or in other words a minimum of nine bags were used for each treatment method and strain, insuring statistical reliability of the data generated. After 48 hours post-filling, the bags were ventilated by puncturing repeatedly with a knife blade.
The straw was then treated with steam at atmospheric pressure for 2 hours (maintaining ~100 degrees C).
The straw was soaked in barrels containing 200L of clean tap water for seven days with no other substances added.
The bags used for the shredded straw were hand compressed more tightly than the regular straw after inoculating each, due to the smaller particle size of the substrate. For spawning, bottles containing 454 g of spawn were mixed intermittently with the maize cob in a manner similar to that described for the straw.
After the remaining bags passed two months of active harvest, they were also weighed and disposed of. The biggest factor in yields was the density of the substrate, with shredded straw showing considerably higher yields than was seen with unshredded straw. To take this idea one step further, we explored different detergent solutions as a method for pasteurization to find which will provide the best protection against outside contamination, while still producing the highest yield. It is interesting to note that the steam treatment method did not have the highest bio-efficiency for all representative strains; which shows the potential for varying growth requirements among this family of mushroom.
It is interesting to note that the regular straw gave higher yield average for ELM 1 treated with bleach and AX treated with washing powder only, all the other strains treated with any of the treatment methods remained that the shredded straw gave better yield in terms of fresh weight. Picture 2 is a bag of the PSAJ strain also treated with the washing powder treatment method.
In situ analysis of lignins in transgenic tobacco reveals a differential impact of individual transformations on the spatial patterns of lignin deposition at the cellular and sub cellular levels".
Ileal losses of nitrogen and amino acids in humans and their importance to the assessment of amino acid requirements.
After the production of edible or medicinal mushroom crops are harvested from these agricultural wastes, the residual mushroom substrate represents a bioconversion from the non-nutritional cellulosic material to an edible fungal matrix of high protein content which can be utilized as nutritious cattle and goat fodder as well as feedstock for tilapia farming.
To achieve the goal of stable, healthy societies, mankind over most of the world has evolved from hunter-gatherer societies to agriculture, aquaculture and animal husbandry for production of their necessary foodstuffs. This makes for a very strong structure, allowing a tree to stand upright for hundreds of years. For example, one may be growing on an oak tree in the temperate region, while another is growing on an oil palm in the tropics. Generally, a local strain of mushroom isolated from nearby the growing location is the best choice, as this local strain will have become acclimatized to the local environment and the local competitors for the food source.
In some cases such as northern climates, it is not unusual to see several different species or strains cycled through a farm over the course of the year as the seasons change.
This usually means the use of large pressure chambers and high temperature steam for sterilization of the substrate. This leaves a substrate which is more selective to the higher cellulose degrading organisms such as Oyster Mushrooms. The spawn substrate used for this project was White Sorghum grain, which was cooked with a measured quantity of water to achieve a moisture content of approx.
The knife blade was 20 mm wide and ventilation holes were made on a random spacing approx 100 mm apart all over the surface of the bag.
The bins were then tipped so that the excess water condensed from the steam treatment could drain off for two hours while cooling. The straw was removed from the barrels after seven days and placed on racks for two hours, covered with newspaper in order to drain excess water and allow outgassing and aeration of the straw.
This additional compression was possible due to the increased density of the shredded straw. The maize cob substrate treated with bleach resulted in yields very similar to the straw substrate.
Lignin is a complex chemical compound found in plant cell walls that is cross-linked with other cell wall components, and acts as an integral part of the secondary cell walls of plants[7] and some algae[3]. After the production of edible or medicinal mushroom crops from these agricultural wastes, the residual mushroom substrate represents a bioconversion from the non-nutritional cellulosic material to an edible fungal matrix of high protein content which can be utilized as nutritious cattle and goat fodder as well as feedstock for tilapia farming. In this way farmers will be able to produce less expensive fodder for their herds while having a commodity that will feed and support their families as well as raise their economic status and maintain the land.
The figures below indicate a significant increase in BE when using shredded straw as the substrate for all the treatment types. In fact, all of nature is a continuous flow of building up followed by decay, with the residual waste from each step of the process forming the raw material basis for the life forms to follow.
This diversified approach results in three successive cash crops from any agricultural operation where previously there had been only the one primary crop.
These farming endeavors have developed over centuries of social evolution, originally utilizing local plants, fish and animals as the raw inputs to make these production systems work. Using only agricultural waste which we have diverted from the disposal stream, and commonly available tools, equipment and supplies, we will show in this paper how anyone of even the most modest means can produce an economically viable crop of wholesome and nutritious food with which to feed their families and villages; the surplus of which can be exported to others as a cash crop. That is to say the fungi take these complex compounds like the proteins and carbohydrates and disassemble them back into the simple compounds which we started with, those compounds like water and carbon dioxide.

The cellulose and hemicellulose are made of sugars which are great sources of food, but these are protected by the lignin wrapping, which is a very stable compound and difficult to breakdown.
This way, one can assure the maximum yield both in the hot season and in the cold season by selecting appropriate strains according to prevailing temperature. However, steam and the associated equipment are both expensive and technically demanding in terms of training and education.
This is the simplest method of substrate preparation; however it is the least effective of any methods we have tried.
It is generally considered that the higher the rate of spawning (the more spawn used per bag) the better the results in consistency and yield, while a lower rate of spawning (less spawn per bag) is cheaper, but with a correspondingly lower yield of mushrooms per bag. These holes both allowed gas exchange and a place for the mushrooms to erupt from when fruiting. This straw was filled into growing bags and spawned in an identical fashion to the experimental bags and grown in the same room and under identical conditions throughout the trial period.
As can be imagined, after soaking this straw for seven days in the sun it was a stinky, sticky mess, but actually had a fairly low microorganism load due to exhaustion of the simple sugars and other readily utilizable food sources upon which the first generation of decay organisms depend. The outcome for the maize cob substrate is not shown in the results simply in the interest of conserving space.
As a biopolymer lignin is unusual because of its assorted composition and lack of defined primary structure.
This type of technique has been shown to decrease the land needed to maintain healthy livestock and increase employment availability. In fact, substrate density appears to be the greatest determining factor in mushroom yield, at least for straw substrate and the strains of oyster mushrooms tested in this experiment. Picture 4 shows fruitbody clusters of an ELM 1 bag treated with the steam treatment method.
Following this natural process, a system of diversified agriculture has been developed and is presented where several successive crops can be raised one after another, each crop depending upon the waste materials from the previous step to act as the raw materials for the next step. However, in the last century or two this has begun to change, with plants and animals from far and wide being imported into new locals as superior candidates for cultivation over the plants and animals found originally in that region. At the end of the first step of this diversified agriculture program the remaining mushroom waste and spent substrate can be utilized as nutritious fodder for goats, cattle, horses, camels, sheep, and fish farming. As these simple compounds are released back into the environment by the fungi, they become available as raw materials for the next generation of plant growth.
Only a few organisms can breakdown the lignin and utilize it as a food source, thus exposing the underlying cellulose and hemicellulose for food use by other organisms. They will each have evolved different enzymes to degrade their respective substrates, and they will have different growth parameters having to do with the temperature, humidity and sunlight intensity in the regions where they evolved. Likewise, it is often preferable to cycle different strains through the farm seasonally depending on substrate availability.
There are many less-developed areas of the world where access to these technological advances are either unavailable or too expensive to utilize. It does work, but the chemical treatment methods are much more effective and not considerably more difficult or expensive. The spawn rate chosen in farm practice is usually a reflection on the price and availability of spawn in the local region.
This method of steam treatment is well known in the mushroom industry and is well understood by anyone familiar with mushroom farming, and so forms the comparison for all other substrate treatment methods. This fermented straw was layered with spawn (454 g bottle) in four plastic bags for each test strain until a total weight for each bag was 2.73 kg (6 pounds). It is notable that the information regarding straw can be used representatively with maize waste and with most other cellulosic agricultural waste. An addition to these obviously stated facts, the first harvest of oyster mushrooms occurs only 18 to 21 days after inoculation. As seen in graphs 1a through 1d, the biological efficiency for any of the test strains using the shredded straw as a substrate gives a noticeably higher yield then using unshredded straw as the substrate for all of the treatment methods.
In this fashion, several food crops can be successfully grown, harvested, and used so that hunger and malnutrition need not be a factor while the people of a country, city, town or village grow and develop. In the process of running through their life cycle, the fungi reproduce as do all other living things. The best known and most effective of these lignin-breakdown organisms are known as the white rot fungi, of which the Oyster mushrooms are the prime examples. To try to grow the northern climate oak mushroom on a palm tree in the tropics would yield very disappointing results. If you have a strain that grows well on straw, you should use that one at grain harvest time when straw is readily available, but if your only substrate is river grass or cassava peeling, by all means be flexible in switching to strains particular to these substrates so as to maximize your harvest. In those areas it would be much more practical to look at ways to pasteurize rather than sterilize the substrate, and by methods other than the use of steam. When the bags reached the proper weight, they were compressed by hand and tied off using segments of light metal wire.
As mentioned above, all forms of White-rot fungi such as Pleurotus ostreatus are able to oxidize the non-digestible lignin, setting free the cellulose and giving both the fungi and other potential consumers such as ruminants ready access to this significant nutrient reservoir.
As seen in this graph, the biological efficiency for any of the Pleurotus strains using the shredded straw as a substrate and steam as the treatment gives a substantially higher yield then using unshredded straw as the substrate.
To put this in perspective, consider the typical case of a cassava farmer in Africa: the cassava is grown and harvested, and the plant waste and cassava peeling are dumped back on the ground. Oyster mushrooms are a closely related species complex, comprised of many species within the genera Hypsyzygus and Pleurotus. Then there are other Oysteresque mushrooms that are not quite as closely related, but which still share most of the characteristics with the other Oyster mushrooms.
This can be done in many ways, such as using commonly available substances such as soap or hydrated lime to pasteurize the substrate. 400 g oyster shell per 100 kgs of dry grain was added, along with 102 kgs of water, which resulted in a pH of 7.0. These bags were kept outside in the shade for two weeks of observation and then moved inside a climate controlled grow room.
All of the shredded straw bags and the maize cob bags were compressed by hand and tied with string, wire or rubber bands. One particular class of fungus, the basidiomycetes, produce a large fleshy reproductive organ (or fruitbody as it is named) which we know more commonly as the mushroom. Many different species of Oyster mushrooms have evolved in different locations around the world, and have become more or less specialized in degrading different raw material cellulose sources (the substrate) at different temperatures, oxygen and light levels (acclimatization). These have names like Hypsyzygus ulmarius, the Elm Oyster, so named because it usually grows on Elm trees. The mechanism by which these chemicals work is through the rapid change in osmotic pressure, causing the majority of microorganisms present to burst from the change in osmotic pressure. After cooking with water and oyster shell, gypsum was added to keep the individual grains of sorghum separated and reduce the possibility of anaerobic conditions forming in the spawn.
While this treatment method did produce edible mushrooms, it did not result in commercially viable quantities of mushrooms being produced. By implementing the system proposed here, the cassava peelings and plant waste becomes the feedstock for the mushroom cultivation which yields a second crop (mushrooms) in approximately three weeks, long before the next crop of cassava would be ready for harvest.
Many of these mushrooms are choice edibles, and in fact represent very high quality nutrition, often equaling or exceeding meat in quantities of protein and essential amino acids. This does not mean that it will ONLY grow on Elm trees, just that this is the usual native habitat. Once the substrate is treated in this way, and the majority of the microorganisms are killed, the substrate is suitable for the introduction of our target species, the Oyster mushroom. The cooked, gypsum treated grain was filled into glass jars of 1 liter size until jars were approx.
This method of substrate preparation is not very effective when compared to the other methods utilized in this trial, and the data on this treatment method is not shown in the results. The waste materials from the mushroom production then becomes a highly nutritious feed for animals and fish such as goats, cows and Tilapia, producing a third crop, where there originally had been but the one primary crop. Recycling of agricultural wastes by white-rot fungi for the production of fodder for ruminants. This increase in efficiency with little additional input of labor or capital has perhaps the greatest potential for elevating the economic status of the rural farmer across much of the world. The top of the jars were covered with a filter made of thick paper and a metal lid screwed over the filter paper. This allows gas exchange of the spawn substrate while eliminating the introduction of any foreign organisms during the spawn grow-out period.
These filled, capped jars were then sterilized in an autoclave at 17 psi steam pressure (approx.
After the sterilized jars were cooled overnight, a small piece of inoculum of the appropriate strain was introduced into each jar under sterile conditions, as will be known by anyone familiar with the art of spawn making.
The inoculated grain jars were then grown for 10 to 12 days before use, which resulted in completely colonized grain of only the target species of mushroom. The short growth period of 10 to 12 days means there was some percentage of unconverted grain starch remaining in the spawn, which becomes a nutritional amendment to the final mushroom substrate, raising the nutrient level of the straw without raising the risk of contamination. The concept of using young grain spawn as both inoculum and nutrition amendment is important to the simplified cultivation process presented here.
Simply adding a rich nutrient amendment to an otherwise poor nutrient base like straw or maize cobs will increase the risk of contamination by unwanted competitive organisms, which would lead to reduced yield of the target mushroom fruitbodies. By using the grain spawn as mentioned here, the grain is already fully colonized by the target mushroom strain, which in turns eliminates all competitors within that jar, while still providing a rich nitrogen and starch base for quick initial growth in the final fruiting substrate for the mushroom organism.

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