Life support & biosphere science : international journal of earth space最新文献_第3页

Increasing plant productivity in closed environments with inner canopy illumination. 在封闭环境中利用内冠光照提高植物生产力。

Life support & biosphere science : international journal of earth space Pub Date : 1998-01-01

M A Stasiak, R Cote, M Dixon, B Grodzinski

引用次数: 0

Is blue light good or bad for plants? 蓝光对植物是好是坏？

Life support & biosphere science : international journal of earth space Pub Date : 1998-01-01

T A Dougher, B G Bugbee

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A modified CROPGRO model for simulating soybean growth in controlled environments. 用于模拟受控环境中大豆生长的改良 CROPGRO 模型。

Life support & biosphere science : international journal of earth space Pub Date : 1997-01-01

J Cavazzoni, T Volk, G Stutte

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Microbial colonization of a closed growth chamber during hydroponic cultivation of lettuce. 水培莴苣过程中封闭生长室的微生物定植。

Life support & biosphere science : international journal of earth space Pub Date : 1997-01-01

D W Koenig, R J Bruce, T C Molina, D J Barta, D L Pierson

{"title":"Microbial colonization of a closed growth chamber during hydroponic cultivation of lettuce.","authors":"D W Koenig, R J Bruce, T C Molina, D J Barta, D L Pierson","doi":"","DOIUrl":"","url":null,"abstract":"The goal of this study was to characterize sessile and planktonic microbiota that developed during two successive hydroponic cultures of lettuce in a closed chamber system. Coupons of polyvinyl chloride (PVC) placed in the nutrient solution lines were removed periodically, as were samples of the nutrient solutions and condensate from the air-handling system. The bacteria and fungi present on the coupons and in fluid samples were enumerated by direct plate counts. Disinfecting the hydroponic system with 0.1% hypochlorite and 0.1 N nitric acid reduced the bacterial densities in biofilm samples from 1 x 10(7) CFU/10 cm2 to 1 x 10(1) CFU/10 cm2 and eliminated culturable fungi; Staphylococcus sp., Pseudomonas sp., and Micrococcus sp. survived this procedure. Bacterial and fungal concentrations in all samples returned to predisinfection levels after 2 days of plant growth. Pseudomonas and Acremonium predominated both before and after disinfection. Fungal concentrations never exceeded 7 x 10(2) CFU/10 cm2. The coupon microbiota differed from that of the rhizoplane at harvest. Overall, the greatest numbers of species were found on the rhizoplane samples collected during the second crop. The microbial community changed little during individual crops or between successive crops. Diversity indices remained relatively constant for all samples.","PeriodicalId":81864,"journal":{"name":"Life support & biosphere science : international journal of earth space","volume":"4 1-2","pages":"61-9"},"PeriodicalIF":0.0,"publicationDate":"1997-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138815492","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Nitrogen dynamics in the CELSS Breadboard facility at Kennedy Space Center. 肯尼迪航天中心 CELSS 面包板设施中的氮动态。

Life support & biosphere science : international journal of earth space Pub Date : 1996-01-01

G W Stutte

{"title":"Nitrogen dynamics in the CELSS Breadboard facility at Kennedy Space Center.","authors":"G W Stutte","doi":"","DOIUrl":"","url":null,"abstract":"For the past 9 years, the Breadboard Project at Kennedy Space Center has studied the feasibility of using crop plants in bioregenerative life support systems for long-duration space missions. Nitrogen (N) has been emphasized in nutrient balance studies because it is a major plant nutrient, undergoes biogenic and abiogenic transformations, and is often limiting to plant growth under field conditions. Nitrogen budgets have been calculated from experimental results to quantify utilization and losses associated with specific crop production systems. The Breadboard Project has recently completed a 418-day potato crop study using recycled nutrient solution to evaluate the impact of continuous production on life support functions. A continuous production system is desirable in maintaining N balance within a solution because crop uptake rates vary dramatically depending upon the stage of crop development. Strategies for recycling N using biological techniques (e.g., biomass degradation with microbial bioreactors) have required that the production system be modified to distribute inputs more evenly over time. Recovery of N is dependent on the form of N entering the bioreactor and the desired output. Aerobic and anaerobic bioreactors for the recovery of N from waste streams and its transformation into a form usable by higher plants are being designed and tested.","PeriodicalId":81864,"journal":{"name":"Life support & biosphere science : international journal of earth space","volume":"3 1-2","pages":"67-74"},"PeriodicalIF":0.0,"publicationDate":"1996-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138815458","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The NASA OCEAN project--an ocean-space analog 美国国家航空航天局海洋项目（NASA OCEAN）--海洋-空间模拟项目

Life support & biosphere science : international journal of earth space Pub Date : 1996-01-01

D Chamberland

{"title":"The NASA OCEAN project--an ocean-space analog","authors":"D Chamberland","doi":"","DOIUrl":"","url":null,"abstract":"An advanced life support system (ALS) with bioregenerative components may one day be required for long-term, deep space exploration, in extended missions to Mars or in establishing long-term bases on the moon. Intensive research programs on such ALS systems have been ongoing throughout the National Aeronautics and Space Administration (NASA) since 1988. Notably, projects have been initiated at the John F. Kennedy Space Center (KSC), Ames Research Center (ARC), and the Lyndon B. Johnson Space Center (JSC). The KSC ALS work has been named the \"Breadboard Project\" because of its approach developing the components and combining them into a breadboard to understanding the bioregenerative ALS picture [also called a Controlled Ecological Life Support System (CELSS)] in smaller pieces, similar to an electronic \"breadboard.\" The Breadboard Project has been involved for 7 years in the study of higher crops grown in a 113 m3 chamber--the longest operating and largest such closed, controlled growth chamber in the world. This chamber has proven itself to be very successful in growing a wide variety of crops from seedlings to harvest and in helping researchers understand the complex biological cycle of such edible plants in closed, environmentally controlled environments. Because the system's ultimate use will be a more challenging environment, moving a specially designed piece of the system into extreme conditions was an important test. Engineers at KSC developed a compact, portable, functional plant module for testing in the world's only fixed seafloor laboratory at Key Largo, FL. The laboratory, called MarineLab, is operated out of the facilities of the Marine Resources Development Foundation in a lagoon of some 10 m depth. The project was called the OCEAN project (Ocean CELSS Experimental Analog NASA).","PeriodicalId":81864,"journal":{"name":"Life support & biosphere science : international journal of earth space","volume":"2 3-4","pages":"183-90"},"PeriodicalIF":0.0,"publicationDate":"1996-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138815438","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Bioregenerative life support systems for long-term space habitation: a conceptual approach. 长期太空居住的生物再生生命支持系统:概念方法。

Life support & biosphere science : international journal of earth space Pub Date : 1995-07-01 DOI: 10.4271/951689

E. Sadeh, W. Sadeh

引用次数: 4