Resistance to amitraz in the parasitic honey bee mite Varroa destructor is associated with mutations in the β-adrenergic-like octopamine receptor

Varroa destructor is considered a major reason for high loss rate of Western honey bee (Apis mellifera) colonies. To prevent colony losses caused by V. destructor, it is necessary to actively manage the mite population. Beekeepers, particularly commercial beekeepers, have few alternative treatments other than synthetic acaricides to control the parasite, resulting in intensive treatment regimens that led to the evolution of resistance in mite populations. To investigate the mechanism of the resistance to amitraz detected in V. destructor mites from French and U.S. apiaries, we identified and characterized octopamine and tyramine receptors (the known targets of amitraz) in this species. The comparison of sequences obtained from mites collected from different apiaries with different treatment regimens, showed that the amino acid substitutions N87S or Y215H in the OctβR were associated with treatment failures reported in French or U.S. apiaries, respectively. Based on our findings, we have developed and tested two high throughput diagnostic assays based on TaqMan technology able to accurately detect mites carrying the mutations in this receptor. This valuable information may be of help for beekeepers when selecting the most suitable acaricide to manage V. destructor.

Resistance to amitraz in the parasitic honey bee mite Varroa destructor is associated with mutations in the β-adrenergic-like octopamine receptor

Varroa destructor is considered a major reason for high loss rate of Western honey bee (Apis mellifera) colonies. To prevent colony losses caused by V. destructor it is necessary to actively manage the mite population. Beekeepers, particularly commercial beekeepers, have few alternative treatments other than synthetic acaricides to control the parasite, resulting in intensive treatment regimens that led to the evolution of resistance in mite populations. To investigate the mechanism of the resistance to amitraz detected in V. destructor mites from French and U.S. apiaries, we identified and characterized octopamine and tyramine receptors (the known targets of amitraz) in this species. The comparison of sequences obtained from mites collected from different apiaries with different treatment regimens, showed that the amino acid substitutions N87S or Y215H in the OctβR were associated with treatment failures reported in French or U.S. apiaries, respectively. Based on our findings, we have developed and tested two high throughput diagnostic assays based on TaqMan® able to accurately detect mites carrying the mutations in this receptor. This valuable information may be of help for beekeepers when selecting the most suitable acaricide to manage V. destructor.

Structure for Synonymous Flow Label (SFL)

Because of the very high loss rate in general activity, enhancements in connection and transmission innovations have made it more difficult to evaluate packet loss utilizing dynamic execution estimation techniques with plotted traffic. That, along with seriously requesting administration level necessities, implies that network administrators currently should have the option to quantify the loss of the actual user data traffic utilizing inactive execution estimation strategies. Multiprotocol Label Switching (MPLS) strategy portrays the prerequisite for presenting stream characters inside the MPLS architecture. This paper depicts a strategy for achieving this by utilizing a method called Synonymous Flow Label (SFL) in which names that imitate the conduct of different labels give the recognizable proof assistance. These identifiers can be utilized to trigger per stream procedure on the packet at the receiving label switching router.

From Little Chapters to the Big Questions

This paper deals with textual transmission in pre-Tridentine Croatian Glagolitic missals and breviaries. Previous research has demonstrated that northern (Krk-Istria) codices follow earlier translations from Greek, whereas southern (Zadar-Krbava) codices have been adjusted to Latin exemplars. However, this differentiation is not clear-cut – certain codices are recognised as a combination of the northern and southern group. The paper addresses the inability to establish a stemma codicum, explaining this through both the high loss rate of Croatian Glagolitic codices and horizontal textual transmission (the usage of more than one exemplar). Further insight into the given topic is provided through discussion of the types of Glagolitic scribes (simple scribe, scholar-scribe, redactor-like scribe, and redactor-scribe) and the determinants of their work, the most prominent of which is the absence of authorial authority. The core of the paper is the study of little chapters as texts shared between breviaries and missals. Data analysis suggests the two liturgical books share a common origin, and that each was likely used as a source for the other. Moreover, data analysis also broadens the notion of the polygenetic origin of Croatian Glagolitic books, which should be understood not only in terms of successive contaminations, but simultaneous contaminations as well. Both types of contamination are sometimes extra-stemmatic, which means that different kinds of sources were used by Glagolitic scribes during copying (including older Glagolitic missals and breviaries, other Church Slavonic books such as the Prophetologion or Apostolos, and personal memory). The paper offers an explanation as to why it is unlikely that a Glagolitic Bible and Latin exemplars were (commonly) used as sources.

Potential distribution of the endangered endemic lizard Liolaemus lutzae Mertens, 1938 (Liolaemidae): are there other suitable areas for a geographically restricted species?

In this study we attempted to access further information on the geographical distribution of the endangered lizard Liolaemus lutzae, estimating its potential distribution through the maximum entropy algorithm. For this purpose, we related its points of occurrence with matrices of environmental variables. After examining the correlation between environmental matrices, we selected 10 for model construction. The main variables influencing the current geographic distribution of L. lutzae were the diurnal temperature range and altitude. The species endemism seemed to be a consequence of a reduction of the original distribution area. Alternatively, the resulting model may reflect the geographic distribution of an ancestral lineage, since the model selected areas of occurrence of the two other species of Liolaemus from Brazil (L. arambarensis and L. occipitalis), all living in sand dune habitats and having psamophilic habits. Due to the high loss rate of habitat occupied by the species, the conservation and recovery of the remaining areas affected by human actions is essential.

The Reason Statistics and Analysis of the Loss of Hotel Employees

Hotels have offered a large number of employment opportunities for society as one of rapid development industries in our country. Whereas hotels face threat from the high loss rate of personnel' demission that even exceeds expected numerical value,as a result,loss directly influences the sustainable development of enterprises. This paper describes the status and characteristic of loss of hotels employees according to the investigation datum of personnel' demission interview in one hotel of Shenzhen,and dissects the main reason why employees leave their posts by adopting Maslow’s demand level theory.

Designing and Implementation of 2D Character Barcode

Base on 2D barcode DM and QR, a new2D character barcode, is proposed in this paper. It is different with the traditional 2D barcode. It is a character matrix instead of the image barcode. The encoding rules, decoding rules and symbol structure of this character barcode are designed and implemented. Then the error-correcting code is studied and added into the encoded information. Finally the 2D character barcode is verified on PC. The experiments show that the 2D character barcode has very small capacity and can be transmitted as the character message among the mobile terminals. It can well overcome high loss rate when the image of 2D barcode is transmitted as a multimedia message and avoid the problem that some mobile terminals can not support the multimedia messages.

Why unprecedented ozone loss in the Arctic in 2011? Is it related to climate change?

An unprecedented ozone loss occurred in the Arctic in spring 2011. The details of the event are revisited from the twice-daily total ozone and NO2 column measurements of the eight SAOZ/NDACC (Système d'Analyse par Observation Zénithale/Network for Detection of Atmospheric Composition Changes) stations in the Arctic. It is shown that the total ozone depletion in the polar vortex reached 38% (approx. 170 DU) by the end of March, which is larger than the 30% of the previous record in 1996. Aside from the long extension of the cold stratospheric NAT PSC period, the amplitude of the event is shown to be resulting from a record daily total ozone loss rate of 0.7% d−1 after mid-February, never seen before in the Arctic but similar to that observed in the Antarctic over the last 20 yr. This high loss rate is attributed to the absence of NOx in the vortex until the final warming, in contrast to all previous winters where, as shown by the early increase of NO2 diurnal increase, partial renoxification occurs by import of NOx or HNO3 from the outside after minor warming episodes, leading to partial chlorine deactivation. The cause of the absence of renoxification and thus of high loss rate, is attributed to a vortex strength similar to that of the Antarctic but never seen before in the Arctic. The total ozone reduction on 20 March was identical to that of the 2002 Antarctic winter, which ended around 20 September, and a 15-day extension of the cold period would have been enough to reach the mean yearly amplitude of the Antarctic ozone hole. However there is no sign of trend since 1994, either in PSC (polar stratospheric cloud) volume (volume of air cold enough to allow formation of PSCs), early winter denitrification, late vortex renoxification, and vortex strength or in total ozone loss. The unprecedented large Arctic ozone loss in 2011 appears to result from an extreme meteorological event and there is no indication of possible strengthening related to climate change.