We carried out a field experiment in order to study effects of fertilization in juvenile plants of three coffee (Coffea arabica) cultivars in Yunnan, SW China. Fertilization treatments included a control without fertilizer (CK), combinations of three NPK fertilization rates [high fertilization (FH), medium fertilization (FM), and low fertilization (FL) with 135, 90, and 45 g per plant per year, respectively], and at two N:P2O5:K2O ratios (R1, 1:0.5:0.8; R2, 1:0.8:0.5). The growth in juvenile plants was not altered by fertilization, with two clear growth peaks being observed in both the height and stem growth rates (RGRs) throughout a year. Both FM and FH resulted in significantly higher RGRs in both height and stem diameter compared to FL and CK in all three cultivars. At the same fertilization rate, the leaf area, branch number, longest branch length, internode number, and biomass of R2 were higher than those of R1, and P significantly affected the root biomass and root to shoot ratio. Compared to the FL treatment, both FM and FH treatments resulted in higher net photosynthetic rates and stomatal conductance across seasons, and in higher intrinsic water-use efficiency during the dry season and at the middle of the wet season. Photosynthetic nitrogen-use efficiency at R2 was higher than that at R1, but no significant differences were observed between the different fertilization rates. Among the three coffee cultivars, Caturra exhibited the highest height, stem diameter, longest branch length, and internode number. Our results indicated that the optimal N:P2O5:K2O ratio was 1:0.8:0.5 for the juvenile growth of coffee plants. Both FM and FH could help optimize the growth and photosynthetic rate of coffee plants, but FM is suitable for the ecological friendly agriculture and economic sustainability at coffee plantations., Z. X. Zhang, Z. Q. Cai, G. Z. Liu, H. Wang, L. Huang, C. T. Cai., and Obsahuje bibliografii
In the laboratory, not all females of the seed bug Lygaeus simulans Deckert, 1985, produced fertilized eggs after copulation: 26.7% of the females were not inseminated and 5% were inseminated but did not lay fertilized eggs; only in 40% of the couples did copulation result in fertile eggs. The remaining 28.3% of couples refrained from mating. Duration of copulation was associated with insemination and fertilization: (i) fertile eggs were produced by only one couple that copulated for less than 60 min and all those that copulated for more than 360 min, (ii) probability of fertilization increased steadily with duration of copulation between 60 and 360 min, and (iii) duration of copulation was significantly different for couples that showed different insemination status.
A possible morphological explanation for this rime dependency was revealed by examining the genitalia of 69 couples freeze-fixed in copula after different periods in copulation. Because of the intricate structure of the genitalia in L. simulans, a male takes a long time to manoeuver its intromittent organ into the narrow insemination duct of the female. Only if completely inserted is the tip of the intromittent organ close enough for successful ejaculation of sperm into the spermatheca. The freeze-fixing experiment revealed that it usually took the male more than 30 min to locate the entrance to the insemination duct and another 30 min for full penetration. This explains why copulations that lasted less than 60 min failed, since insemination began only after intromission was complete.
The experiments, therefore, indicated that there is a relationship between the complex morphology of the genitalia and the low rates of insemination and fertilization in L. simulans., Thomas Micholitsch, Peter Krügel, Günther Pass, 7 obrázků, 1 tab., and Lit.
Cíl: Cílem práce bylo zjistit a následně porovnat kvalitu života žen s přirozeným otěhotněním s kvalitou života žen po umělém oplodnění. Kvalita života byla u těchto dvou skupin žen hodnocena během těhotenství dvakrát, a to ve 20. – 28. týdnu těhotenství a před termínem porodu. Metodika: Ke sběru empirických dat byl použit standardizovaný dotazník Světové zdravotnické organizace WHOQOL – BREF. Výzkumný vzorek tvořilo 160 těhotných žen, z nichž bylo 80 žen po spontánním otěhotnění a 80 žen po umělém oplodnění. Výzkum byl realizován ve Fakultní nemocnici v Ostravě, Gyncentru v Ostravě a Gyncentru v Opavě. Výsledky: Těhotné ženy po spontánním i po umělém oplodnění hodnotily kvalitu života v těhotenství jako dobrou při prvním (20. – 28. týden těhotenství) i při druhém hodnocení (před termínem porodu). Spokojenost se zdravím hodnotily oba soubory žen při prvním i druhém hodnocení v průměru jako dobrou. Největší rozdíl v hodnocení byl v první doméně posuzující fyzické zdraví. Ve 20. – 28. týdnu těhotenství hodnotily ženy po spontánním otěhotnění své fyzické zdraví lépe než před termínem porodu (p < 0,001). Naproti tomu u žen po umělém oplodnění nedošlo k tak významnému rozdílu mezi prvním a druhým hodnocením. Při hodnocení dalších tří domén těhotnými ženami ať už po spontánním nebo umělém oplodnění nedošlo k výrazným rozdílům v hodnocení. Závěr: Kvalita života přímo nezávisí na způsobu otěhotnění, ale je velmi individuální, stejně tak i výskyt nepříjemných pocitů provázejících těhotenství., Objective: The aim of the work was to find out and consequently compare the quality of life of women who got pregnant naturally with those who underwent artificial insemination. Quality of life was evaluated twice during the pregnancy, between the 20th and 28th week and just before actual childbirth. Methods: A standardized questionnaire WHOQOL – BREF was used for empirical data collection. The sample was made up of 160 pregnant women divided into two groups: 80 women who had got pregnant naturally and 80 women who underwent artificial insemination. The research was realized at the Faculty hospital Ostrava, Gyncentre Ostrava and Gyncentre Opava. Results: Both groups confirmed quality of life as good during the first and the second evaluation and satisfaction with one's health was on average good as well. The biggest difference was related to physical health. Between the 20th and 28th week of pregnancy women who got pregnant naturally determined their physical health as better than before actual childbirth (p < 0,001). However, not so for women who were artificially inseminated, where differences were not so significant. In the other areas of the study no significant differences were found between either groups. Conclusion: Quality of life does not directly depend on the means of getting pregnant but is very much individual, as well as the occurrence of any unpleasant feelings during the pregnancy., Bohdana Dušová, Markéta Tulisová, and Literatura